JP7207752B2 - File - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file, and more particularly, to a file that can open and fold paper sheets together with front and back covers approximately 360 degrees with a binding tool as a fulcrum.

If the file can be opened and folded at approximately 360 degrees with the binding tool as a fulcrum, the file folded back 360 degrees can be held with one hand and folded back even in a narrow space such as a train. It is possible to easily read the sentences written on the paper sheets of the folded file, or to easily perform required writing or the like on the paper sheets of the folded file. Therefore, files that can be folded 360 degrees are generally preferred and widely used in the world.

A file that can be folded back 360 degrees is disclosed in Patent Document 1, for example. That is, as shown in FIGS. 21 and 22, Patent Document 1 discloses a paper sheet 101, a binder 102 for binding one end side of the paper sheet 101, and a paper sheet 101 attached to the binder 102. Equipped with a front cover 103, a back cover 104 and a back cover 105 for protecting from the outside, the other end side of the paper sheet 101 can be opened 360 degrees around the binder 102 as a fulcrum and folded back together with the front cover 103 and the back cover 104. File 100 is disclosed.

The binding tool 102 has a plurality of binding pieces 106 (left and right binding pieces 106a and 106b) which are inserted into a binding hole 101a formed on one end side of the paper sheet 101 and formed in a substantially rectangular annular shape when closed. I have. The left and right binding pieces 106a and 106b are formed by protruding outward in the width direction (direction of arrow F) from side walls of left and right base portions 107a and 107b extending in the longitudinal direction (direction of arrow L). and left and right distal end portions 109a and 109b formed by bending inward in the width direction on the distal end sides of the proximal end portions 108a and 108b. The left and right tip portions 109a and 109b are configured to contact and separate from each other by opening and closing the left and right base portions 107a and 107b in the width direction (in the direction of arrow F) via a coupling mechanism or the like (not shown). there is

JP 2017-140785 A

However, in the file 100 disclosed in Patent Document 1, the leading ends 109a and 109b of the left and right binding pieces 106a and 106b are separated from each other to separate the bound paper sheets 101 from the binding pieces 106 (106a and 106b). or when a new paper sheet 101 is attached to the binding pieces 106 (106a, 106b), the leading ends 109a, 109b of the binding pieces 106 (106a, 106b) face each other inward in the width direction. Therefore, it is necessary to move the paper sheet 101 in an unstable posture while rotating the paper sheet 101 from the horizontal state to the vertical state or from the vertical state to the horizontal state by approximately 90 degrees. As a result, the binding holes 101a of the paper sheets 101 are likely to be caught by the leading ends 109a and 109b of the binding strips 106 (106a and 106b), and the paper sheets 101 are difficult to put on and take off. 23, the binding pieces 206 (206a, 206b) are formed in a substantially annular shape when closed, and the tip portions 209a, 209b rotate about the shaft portion 201 to open and close. Similar problems have occurred with other binding tools 202 .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its object is to provide a file that can be opened and folded at approximately 360 degrees with a binding tool as a fulcrum along with front and back covers. To provide a file having good operability when attaching and detaching paper sheets to and from the binding pieces by releasing the engagement between the leading ends of the binding pieces in a tool.

In order to solve the above problems, the file according to the present invention has the following configuration.
(1) a binding tool for binding one end of paper sheets, a front cover and a back cover attached to the binding tool to protect the paper sheets from the outside, and a spine connecting the front cover and the back cover A file capable of opening and folding back the other end side of the paper sheet together with the front cover and the back cover about 360 degrees with the binding tool as a fulcrum,
The binding tool includes
Left and right binding pieces that are inserted into a plurality of binding holes formed on one end side of the paper sheet and are formed in a substantially square annular shape when the leading ends facing inward in the width direction are engaged with each other;
Left and right connecting portions that connect the base end portions of the binding pieces in the longitudinal direction at appropriate intervals;
a plurality of bearing portions respectively formed in the left and right connecting portions and arranged alternately in the longitudinal direction;
a rotation center shaft inserted through each of the bearing portions and extending in the longitudinal direction;
and a spring member mounted between the left and right connecting portions,
The back cover is fixed to the back side of one of the left and right connecting parts,
With the front cover and the back cover opened approximately 180 degrees, when the engagement between the leading ends of the left and right binding pieces is released, one of the connecting portions to which the back cover is fixed and the back cover. The other connecting portion that is not fixed is rotatable to a state where the mutual opening angle with respect to the rotation center axis is approximately 80 to 100 degrees by the biasing force of the spring member. and

In the present invention, the binding tool is inserted through a plurality of binding holes formed on one end side of the paper sheets, and is formed in a substantially square annular shape when the leading ends facing inward in the width direction are engaged with each other. Left and right binding pieces, left and right connecting portions for connecting the base ends of the binding pieces at appropriate intervals in the longitudinal direction, and a plurality of bearing portions respectively formed in the left and right connecting portions and arranged alternately in the longitudinal direction. , a rotation center shaft that is inserted through each bearing and extends in the longitudinal direction, and a spring member that is mounted between the left and right connecting portions, and on the back side of either the left or right connecting portion , with the spine fixed and the front and back covers opened approximately 180 degrees, when the engagement between the leading ends of the left and right binding pieces is released, one connecting portion where the spine is fixed and the spine The other connecting portion to which the cover is not fixed is rotatable by the biasing force of the spring member up to a mutual opening angle of approximately 80 to 100 degrees with respect to the central axis of rotation. When detaching the leaf from the binding piece or attaching a new sheet to the binding piece, for example, with the spine facing downward and the front cover and the back cover opened approximately 180 degrees, When the leading ends of the left and right binding pieces are disengaged, the other connecting portion is not easily affected by the spine connected to the front cover and the back cover, so it is mainly affected by the biasing force of the spring member. It rotates approximately 80 to 100 degrees upon receiving the Therefore, the tip portion of the other binding piece connected to the other connecting portion is automatically rotated to a substantially upward posture. On the other hand, one of the connecting portions to which the back cover is fixed is restricted or restricted in rotation by the back cover connected to the front cover and the back cover that are opened approximately 180 degrees. Therefore, the leading end of one of the binding pieces connected to one of the connecting portions is likely to be substantially maintained in a position facing inward in the width direction before the engagement is released.

In addition, when the front and back covers are opened approximately 180 degrees with the back cover facing the side and the engagement between the leading ends of the left and right binding pieces is released, the other connecting part is connected to the front cover. And since it is not easily affected by the back cover connected to the back cover, it rotates approximately 80 to 100 degrees mainly under the influence of the biasing force of the spring member. Therefore, the tip portion of the other binding piece connected to the other connecting portion is automatically rotated to a substantially horizontal orientation. On the other hand, one of the connecting portions to which the back cover is fixed is restricted or restricted in rotation by the back cover connected to the front cover and the back cover that are opened approximately 180 degrees. Therefore, the leading end of one of the binding pieces connected to one of the connecting portions is likely to be maintained substantially upwardly before the disengagement of the engagement.

Therefore, the paper sheet is gripped in a horizontal posture, and the leading edge of the other binding piece, which is in a substantially upward posture, passes through the binding hole formed on one end side of the paper sheet in a substantially vertical direction. By doing so, the paper sheets can be easily separated from the binding piece, or the paper sheets can be easily attached to the binding piece. Therefore, it is possible to greatly reduce the possibility that the leading edge of the binding piece is caught in the binding hole of the paper sheets when the paper sheets are removed or attached. As a result, it is possible to significantly improve the operability when attaching and detaching paper sheets to and from the binding piece.

As described above, according to the present invention, there is provided a file in which front and back covers of paper sheets can be opened and folded at approximately 360 degrees around a binding tool as a fulcrum. can be released to provide a file with good operability when paper sheets are attached to or detached from the binding piece.

(2) In the file described in (1),
The spring member is a compression torsion coil spring that is longitudinally compressed and mounted between the bearing portions that are alternately arranged in the longitudinal direction, and is helically wound around the rotation center shaft. ,
One end edge arm portion of the compression torsion coil spring urges one of the connection portions to which the spine is fixed to the back side, and the other end edge arm portion of the compression torsion coil spring is adapted to urge the back cover. It is characterized in that the other connecting portion that is not fixed is biased outward in the width direction.

In the present invention, the spring member is a compression torsion coil spring that is longitudinally compressed and mounted between the bearing portions that are alternately arranged in the longitudinal direction, and is helically wound around the rotation center shaft. , one end edge arm portion of the compression torsion coil spring biases one connection portion to which the back cover is fixed to the back side, and the other end edge arm portion of the compression torsion coil spring is to which the back cover is fixed. Since the other connecting portion that is not connected is urged outward in the width direction, when the front and back covers are opened approximately 180 degrees and the leading ends of the left and right binding pieces are disengaged, Most of the biasing force in the torsion direction by the compression torsion coil spring acts as a moment force that rotates the other connecting portion, to which the back cover is not fixed, outward in the width direction. Therefore, for example, when the back cover 33 is directed downward, the tip of the other binding piece connected to the other connecting portion is stably directed substantially upward by the biasing force in the twisting direction of the compression torsion coil spring. held in position. On the other hand, the leading end of one of the binding pieces connected to one of the connecting portions to which the back cover is fixed is substantially stably maintained in a position facing inward in the width direction before the engagement is released. Also, when the back cover is turned sideways, the tip of the other binding piece connected to the other connecting portion is changed to a posture facing substantially laterally, while being connected to the one connecting portion. On the other hand, the leading end of the binding piece is substantially stably maintained in a substantially upward posture before the engagement is released.

Therefore, the paper sheet is held in a horizontal posture, and one end of the paper sheet is held against the leading end of the other binding strip (or the leading end of one binding strip) that is stably directed substantially upward. By allowing the paper sheets to pass through the binding hole formed on the side in a substantially vertical direction, the paper sheets can be more easily removed from the binding piece, or the paper sheets can be easily attached to the binding piece. As a result, when the paper sheets are removed or attached, the possibility that the binding holes of the paper sheets are caught by the tip of the binding piece is further reduced, and the operability when attaching and detaching the paper sheets to and from the binding piece is improved. can be further improved.

(3) In the file described in (2),
A cam surface inclined with respect to the rotation center axis is provided on each of the longitudinal end surfaces of the adjacent bearing portions,
The cam surfaces are formed so as to be separated from each other when the leading ends of the left and right binding pieces are in an engaged state and to abut each other in a disengaged state.

In the present invention, the longitudinal end surfaces of adjacent bearing portions are provided with cam surfaces that are formed to be inclined with respect to the central axis of rotation. Since they are separated from each other and are formed so as to contact each other in the disengaged state, when the engagement of the leading ends of the left and right binding pieces is disengaged, the compression torsion springs are moved in the longitudinal direction as the cam surfaces come into contact with each other. A biasing force extending toward the cam surface is transmitted to the bearing portion formed with the cam surface. Therefore, the holding force of the opening angle between the left and right connecting portions can be increased through the bearing portion to which the urging force of the compression torsion spring that extends in the longitudinal direction is transmitted. Therefore, the opening angle between the left and right connecting portions can be maintained in the maximum state. As a result, when the bound paper sheets are separated from the binding strips or when new paper sheets are attached to the binding strips, the separated state between the leading ends of the binding strips can be more reliably maintained and the binding strips can be secured. It is possible to further reduce the possibility that the binding hole of the paper sheet is caught in the leading end of the paper sheet.

(4) In the file described in (1),
The spring member is a compression coil spring that is longitudinally compressed and mounted between the bearing portions that are alternately arranged in the longitudinal direction, and is helically wound around the rotation center shaft,
Cam surfaces inclined with respect to the central axis of rotation are provided on longitudinal end surfaces of the bearing portions formed on the left and right connecting portions, respectively,
The cam surfaces are formed so as to be separated from each other when the leading ends of the left and right binding pieces are in an engaged state and to abut each other in an disengaged state.

In the present invention, the spring member is a compression coil spring that is longitudinally compressed and mounted between bearing portions that are alternately arranged in the longitudinal direction, and is helically wound around the rotation center shaft. The longitudinal end faces of the bearings formed on the left and right connecting portions are respectively provided with cam surfaces that are inclined with respect to the central axis of rotation. Since the cam surfaces are separated from each other in the engaged state and are in contact with each other in the disengaged state, when the engagement of the leading ends of the left and right binding pieces is released, the cam surfaces are in contact with each other. Along with this, the urging force of the compression coil spring that extends in the longitudinal direction is transmitted as a rotational force to the bearing portion on which the cam surface is formed. Therefore, based on the urging force of the compression coil spring extending in the longitudinal direction, the one connecting portion and the other connecting portion can be rotated to a state where the mutual opening angle with respect to the rotation center axis is approximately 80 to 100 degrees. can. As a result, when the bound paper sheets are removed from the binding piece, or when new paper sheets are attached to the binding piece, the separated state between the leading ends of the binding pieces is reliably maintained, and the leading ends of the binding pieces It is possible to further reduce the possibility that the binding hole of the paper sheet is caught in the part.

(5) In the file described in (3) or (4),
The bearing portion provided with the cam surface is provided at least in the vicinity of the end portion in the longitudinal direction of the connecting portion.

In the present invention, the bearing portion provided with the cam surface is provided at least in the vicinity of the end portion in the longitudinal direction of the connecting portion. A biasing force extending upward acts on the cam surface, and the opening angle of the connecting portion can be maintained at the maximum even in the vicinity of the longitudinal ends of the binding device. Therefore, when the bound paper sheets are separated from the binding strips, or when new paper sheets are attached to the binding strips, the separated state between the leading ends of the binding strips in the vicinity of the ends in the longitudinal direction is maintained, It is possible to further reduce the possibility that the tip of the binding piece is caught in the binding hole of the paper sheet.

In addition, since the opening angle of the connecting portion can be maintained at the maximum in the vicinity of the ends in the longitudinal direction of the binding device, the torsional rigidity in the longitudinal direction of the connecting portion can be supplemented. Therefore, for example, the compression torsion coil spring or the compression coil spring can be formed more compactly, and the thickness (dimension in the width direction) of the connecting portion can be formed as thin as possible. Therefore, when the other end side of the paper sheet is folded 360 degrees with the binding tool as a fulcrum along with the front cover and the back cover, the gap between the front cover and the back cover due to the connection part on the one end side of the paper sheet is It can be reduced, and the range in which the front cover 31 and the back cover 32 can be brought into close contact can be expanded. As a result, it is possible to reduce discomfort (for example, fluffy feeling) when writing on folded paper sheets.

(6) In the file described in any one of (2) to (5),
the base end portions of the left and right binding pieces are formed to have a dimension equal to or greater than the plate width in the longitudinal direction and are displaced from each other in the longitudinal direction;
At the distal end portions of the left and right binding pieces, there is provided an inclined portion projecting inward in the width direction from the distal end side of the base end portion by a predetermined length and inclined in the longitudinal direction from the position projecting inward in the width direction. Engagement portions that engage with each other are formed,
The engaging portion has a convex portion protruding in a mountain shape in the plate width direction of the inclined portion on the tip side, and a concave portion that engages with the mating convex portion in the plate width direction of the inclined portion. and a receiving portion that engages with the mating convex portion in the direction of the inside and outside of the plate of the inclined portion is formed on the base end side.

In the present invention, the base end portions of the left and right binding pieces are formed with a dimension equal to or larger than the plate width in the longitudinal direction and are displaced from each other in the longitudinal direction. Since the engaging portions projecting inward in the width direction for a predetermined length from the distal end side and engaged with each other are formed at inclined portions inclined in the longitudinal direction from the positions projecting inward in the width direction, a plurality of engaging portions are formed. To avoid interference between binders of adjacent files when files are superimposed and stored in a bookshelf or the like, and to increase the number of files stored in the bookshelf or the like.

Further, the engaging portion has a convex portion protruding in a mountain shape in the plate width direction of the inclined portion on the tip end side, and the concave portion that engages with the mating convex portion in the plate width direction of the inclined portion and the mating portion Since the receiving portion that engages with the convex portion of the inclined portion in the plate inner-outer direction is formed on the base end side, the engaging portions are reliably engaged with each other in the plate width direction and the plate inner-outer direction of the inclined portion. It is possible to avoid inadvertent disengagement. Therefore, the front cover and the back cover of the paper sheet can be opened and folded at approximately 360 degrees around the binding tool as a fulcrum.

(7) In the file described in (6),
In one of the engaging portions, a vertical wall portion connecting the convex portion and the receiving portion is formed along a boundary portion between the convex portion and the receiving portion. In the portion, a groove portion is formed between the convex portion and the receiving portion to escape the vertical wall portion from the plate outer surface to the plate inner surface of the other engaging portion.

In the present invention, one of the engaging portions has a vertical wall portion that connects the convex portion and the receiving portion along the boundary portion between the convex portion and the receiving portion. A groove is formed between the convex portion and the receiving portion to escape the vertical wall portion from the outer surface of the other engaging portion to the inner surface of the plate. It is possible to effectively avoid the problem that the protrusions go too far in the width direction with respect to the recesses and do not return.

That is, in the left and right binding pieces, the engaging portions are pressed so as to come into contact with each other in the longitudinal direction by the urging force of the compression torsion coil spring (or the compression coil spring) that tends to expand in the longitudinal direction. Therefore, when the vertical wall portion is not formed, if the convex portion of the engaging portion exceeds the concave portion of the counterpart in the width direction, the crest portion of the convex portion may In some cases, the convex portion may not return to the position where it engages with the concave portion because the convex portion is caught by the inclined portion slanted in the longitudinal direction.

However, in the present invention, since the vertical wall portion that connects the protrusion and the receiving portion is formed along the boundary portion between the protrusion and the receiving portion, the protrusion is attached to the other engaging portion. Even if it goes too far in the width direction with respect to the concave portion, the crest of the protruding portion thickened by the vertical wall contacts the entire side wall of the inclined portion, so that it becomes easy to slip, and the crest of the protruding portion contacts the other side. It becomes difficult to get caught on an inclined part. This allows the protrusion to easily return to the position of engagement with the mating recess. Therefore, the operation of engaging and releasing the engaging portion formed at the tip of the binding piece in the binding tool can be performed more easily.

(8) In the file described in (7),
When the convex portion of the other engaging portion and the concave portion of the one engaging portion are engaged with each other, the contact surfaces of the convex portion and the concave portion, which are in contact with each other on the front end side in the width direction of the convex portion, formed in an inclined shape at a predetermined angle with respect to the plate width direction of the inclined portion,
The tip side end surface of the vertical wall portion in the one engaging portion and the tip side end surface of the receiving portion in the other engaging portion are substantially parallel to or in contact with the plate width direction of the inclined portion. It is characterized in that it is inclined at a predetermined angle in the direction opposite to the surface and is formed so as to have a minute gap when engaged.

In the present invention, when the convex portion of the other engaging portion and the concave portion of the one engaging portion are engaged with each other, the contact surfaces of the convex portion and the concave portion that abut on the tip end side in the width direction of the convex portion are the inclined portions. It is formed in an inclined shape at a predetermined angle with respect to the plate width direction, and the tip side end surface of the vertical wall portion in one engaging portion and the tip side end surface of the receiving portion in the other engaging portion are the plates of the inclined portion It is formed substantially parallel to the width direction or inclined at a predetermined angle in the direction opposite to the contact surface, and is formed so as to have a minute gap when engaged, so that the width When a load is applied in the direction, the tip side end face of the vertical wall portion of one engaging portion and the tip side end face of the receiving portion of the other engaging portion are immediately brought into contact with each other, and a gap between the tip side end faces is formed. , a pressing force acts to press each other in a direction perpendicular to the plate width direction of the inclined portion or in a direction in which the engaging portions are engaged with each other.

Therefore, a frictional force proportional to the pressing force can be generated between the tip end faces. In addition, since the pressing force presses each other in a direction orthogonal to the plate width direction of the inclined portion or in a direction in which the engaging portions are engaged with each other, at least a force component in the direction of releasing the engagement of the engaging portions is not generated. . Therefore, even when a load is applied in the width direction to the left and right binding pieces, the pressing force prevents the abutment surfaces of the convex portion and the concave portion from moving in the disengagement direction. Detachment of the concave portion can be avoided. As a result, it is possible to effectively control the deformation, crushing, etc. of the left and right binding pieces due to the load in the width direction of the binding device.

(9) In the file described in any one of (6) to (8),
The protrusions protrude in the plate width direction by substantially the same amount, and the contact surfaces on which the protrusions abut against each other are negative angles at a predetermined angle with respect to the longitudinal direction when viewed from the front. characterized in that it is formed with an inclination of .

In the present invention, the amount of protrusion that protrudes in the plate width direction of the protrusions is formed to be substantially the same, and the contact surfaces on which the protrusions contact each other are formed at a predetermined angle with respect to the longitudinal direction in a front view. Since it is inclined at a negative angle, even if a load is applied to the binding piece in a direction in which the engaging portion is disengaged in the longitudinal direction, the protrusions contact each other at a negative angle with respect to the longitudinal direction. can effectively avoid the disengagement of the projections. As a result, the deformation and crushing of the left and right binding pieces 2T (2Ta, 2Tb) due to the load in the longitudinal direction of the binding device 2 can be effectively restricted.

(10) In the file described in any one of (6) to (8),
The projecting amount of the projecting portion projecting in the plate width direction is formed to be different from each other,
The convex portion with a large amount of protrusion is formed in a substantially trapezoidal shape, and the convex portion with a small amount of protrusion is formed in a substantially triangular shape.

In the present invention, the protrusions projecting in the width direction of the plate are formed to have different amounts of protrusion, the protrusions having a large protrusion amount are formed in a substantially trapezoidal shape, and the protrusions having a small protrusion amount are formed substantially in the shape of a trapezoid. Since it is formed in a triangular shape, it is possible to more effectively avoid the problem that, when the engaging portions are engaged with each other, the convex portion overshoots the opposing concave portion in the width direction and does not return.

That is, in the left and right binding pieces, the engaging portions are pressed so as to come into contact with each other in the longitudinal direction by the urging force of the compression torsion coil spring (or the compression coil spring) that tends to expand in the longitudinal direction. Therefore, in the case where the convex portion protrudes in the plate width direction by the same amount, if the convex portion of the engaging portion extends too far in the width direction with respect to the mating concave portion, both the left and right convex portions The peak portion of the portion is caught by the inclined portion of the other end portion which is inclined from the width direction to the longitudinal direction, and the convex portion becomes more difficult to return due to the position where it engages with the concave portion.

However, in the present invention, the projections projecting in the width direction of the plate are formed so as to differ from each other. Since it is formed in a substantially triangular shape, even if the convex portion extends too far in the width direction with respect to the concave portion of the counterpart, only the convex portion with a large projecting amount contacts the inclined portion at the tip of the counterpart and protrudes. A convex portion with a small amount does not abut on the inclined portion of the other tip. Moreover, since the convex portion with a large amount of projection is formed in a substantially trapezoidal shape, it becomes easy to slip on the inclined portion, and the peak portion of the convex portion is less likely to be caught on the opposing inclined portion. This allows the protrusion to easily return to the position of engagement with the mating recess. Therefore, the operation of engaging and releasing the engaging portion formed at the tip of the binding piece in the binding tool can be performed more easily.

(11) In the file described in any one of (1) to (10),
The left and right binding pieces are formed to have U-shaped cross-sections facing each other, and the base ends of the binding pieces are connected to the other binding piece connected to the other connection portion to which the back cover is not fixed. The depth of the bottom of the U-shaped cross-section is formed larger than the depth of the bottom of the U-shaped cross-section at the base end with respect to the tip of one of the binding pieces connected to the one of the connecting portions to which the back cover is fixed. It is characterized by

In the present invention, the left and right binding pieces are formed to have U-shaped cross-sections facing each other, and are connected to the other connecting portion to which the back cover is not fixed. The depth of the bottom of the U-shaped cross-section is formed to be greater than the depth of the bottom of the U-shaped cross-section at the base end with respect to the tip of one of the binding pieces connected to one of the connecting portions to which the spine is fixed. , with the back cover facing downward and the front and back covers opened approximately 180 degrees, when the engagement between the leading ends of the left and right binding pieces is released, the U-shaped cross section of one binding piece It is possible to reduce the widthwise inward protrusion amount of the tip portion with respect to the bottom portion, while increasing the substantially upward protrusion amount 8 of the tip portion with respect to the U-shaped cross-sectional bottom portion of the other binding piece.

Therefore, when the bound paper sheets are separated from the binding piece, or when new paper sheets are attached to the binding piece, the tip of the other binding piece, which has increased the amount of protrusion substantially upward, More paper sheets can be attached and detached at once. In addition, by reducing the amount of inward protrusion in the width direction of the tip portion of one of the binding pieces with respect to the bottom of the U-shaped cross section, when the paper sheets are moved in a substantially vertical direction, the one end side of the paper sheets is It is possible to reduce the possibility that the tip of one of the binding pieces will get caught. As a result, it is possible to further improve the operability when attaching/detaching paper sheets to/from the binding piece.

(12) In the file described in any one of (1) to (11),
Of the plurality of bearing portions formed in the left and right connecting portions, at least two or more of the bearing portions are opened in opposite directions in the width direction when the leading ends of the left and right binding pieces are engaged with each other. It is characterized in that the strips are formed by connecting them in the longitudinal direction.

In the present invention, at least two or more of the plurality of bearing portions formed in the left and right connecting portions are arranged in mutually opposite directions in the width direction in a state where the tip portions of the left and right binding pieces are engaged with each other. Since the open bearing pieces are connected in the longitudinal direction, no matter how the opening angle between the connecting portions changes, the bearing pieces open in the opposite direction allow the bearing pieces to move in the radial direction from the rotation center axis. Therefore, the fitting state of the bearing portion with respect to the rotation center shaft can be maintained. Therefore, even when the leading ends of the left and right binding pieces are disengaged from each other and the opening angle of the left and right connecting portions is approximately 80 to 100 degrees, the fitting state of the bearing portion with respect to the rotation center shaft can be maintained. can. As a result, when the bound paper sheets are separated from the binding strips or when new paper sheets are attached to the binding strips, the separated state between the leading ends of the binding strips can be more reliably maintained and the binding strips can be secured. It is possible to further reduce the possibility that the binding hole of the paper sheet is caught in the leading end of the paper sheet.

(13) In the file described in any one of (1) to (12),
The rotation center axis is arranged at a position eccentric to the width direction center line of the one connecting portion to which the back cover is fixed, toward the other connecting portion to which the back cover is not fixed. It is characterized by

In the present invention, the central axis of rotation is arranged at a position eccentric to the widthwise center line of one connecting portion to which the back cover is fixed, toward the other connecting portion to which the back cover is not fixed. Therefore, the stopper portion that releases the engagement between the leading ends of the left and right binding pieces and holds the opening angle of the left and right connecting portions at the maximum state is arranged on the width direction side surface of one connecting portion and on the other connecting portion. can be formed on the back side of the Therefore, it is possible to provide the stopper portion at a suitable position in the longitudinal direction while ensuring the necessary thickness in the width direction of the one connecting portion and the other connecting portion.

Further, by providing the stopper portion at a suitable position in the longitudinal direction, the opening angle between the left and right connecting portions can be held substantially equal in the longitudinal direction. As a result, when the bound paper sheets are separated from the binding strips, or when new paper sheets are attached to the binding strips, the separation distance between the leading ends of the binding strips in the entire longitudinal direction is maintained substantially equal. Therefore, it is possible to further reduce the possibility that the leading edge of the binding piece is caught in the binding hole of the paper sheet.

(14) In the file described in any one of (1) to (13),
On the back side of one of the connecting parts, there is a base standing symmetrically with respect to the central part in the longitudinal direction, and claws formed wider than the base. A plurality of claw-shaped locking portions protruding toward the direction center portion side are formed,
The back cover is formed with a locking hole having a large diameter portion through which the claw portion passes and a small diameter portion that is engaged with the base portion and is sandwiched between the claw portions. Characterized by

In the present invention, the back side of one of the connecting portions is composed of a base standing symmetrically with respect to the central portion in the longitudinal direction and a claw portion formed wider than the base, and the claw is formed on the base. A plurality of claw-like engaging portions projecting from the front end toward the central portion in the longitudinal direction are formed, and the claw portion passes through the large-diameter portion of the back cover and engages with the base portion at the small-diameter portion. Since a locking hole with a different diameter long hole that is sandwiched between the claws is formed, the claw is inserted into the large diameter part of the locking hole with the central part in the longitudinal direction of the back cover curved in a mountain shape. After passing through, the central portion in the longitudinal direction of the back cover is returned to a flat state, and with the base portion engaged with the small diameter portion of the locking hole, the small diameter portion of the locking hole is sandwiched and restrained by the claw portion. can be done.

Therefore, the back cover can be easily fixed to the back side of one of the connecting parts, and there is no need to attach a new connecting member for fixing the back cover to one of the connecting parts. As a result, the structure of one of the joints for fixing the back cover is simplified, and when the other end side of the paper sheet is folded about 360 degrees with the binding tool as a fulcrum together with the front and back covers, the paper sheet can be folded back. It is possible to minimize the gap between the front cover and the back cover due to the connecting portion at one end of the sheet, and to further reduce discomfort (for example, fluffy feeling) when writing on folded paper sheets.

In addition, in a state in which the central portion of the spine in the longitudinal direction is curved in a mountain shape, the claw portion is passed through the locking hole of the large diameter portion, and then the central portion of the spine in the longitudinal direction is returned to a flat state, With the base portion engaged with the locking hole of the small-diameter portion, the locking hole can be sandwiched and restrained by the claw portion, so the back cover is fixed to the back side of one of the connecting portions by welding or caulking. Processes and equipment are no longer required, which can contribute to cost reduction.

(15) In the file described in any one of (1) to (14),
On the other end side of the front cover and the other end side of the back cover, when the other end side of the paper sheet is folded back with the front cover and the back cover opened approximately 360 degrees around the binding tool as a fulcrum, Forming an enlarged portion in the longitudinal upper region that is enlarged in the width direction from the tip of the other end of the paper sheet, and forming a shortened portion that is shortened in the width direction in the longitudinal lower region, A curved portion connecting the extended portion and the shortened portion in a concave curved shape,
Both of the curved portions of the front cover and the back cover are formed so as to be displaced from each other in the longitudinal direction at positions where they intersect the leading edge of the other end of the paper sheet.

In the present invention, on the other end side of the front cover and the other end side of the back cover, when the other end side of the paper sheet is folded about 360 degrees with the binding tool as a fulcrum with the front cover and back cover, the paper Forming an extended portion extending in the width direction from the tip portion of the other end side of the leaf in the longitudinal upper region, forming a shortened portion shortened in the width direction in the longitudinal lower region, and forming the extended portion and the shortened portion in a concave curved shape, and both the curved portions of the front cover and the back cover are displaced from each other in the longitudinal direction at positions where they intersect with the tip of the other end of the paper sheet. Since it is formed in such a way that the front cover and the back cover folded back by about 360 degrees can be easily returned to the original closed state by putting a finger on one of the curved parts protruding in the longitudinal direction. Therefore, in a file in which the front and back covers of paper sheets can be opened and folded at approximately 360 degrees with the binding tool as a fulcrum, the operation of returning the front and back covers that have been folded back approximately 360 degrees to the original closed state. It is possible to provide files with good quality.

(16) In the file described in any one of (1) to (15),
It is characterized by having paper sheets formed with fewer binding holes than JIS standard paper.

In the present invention, since the paper sheet 1 is formed with fewer binding holes 11 than JIS standard paper, when folding the paper sheet 1 approximately 360 degrees along the binding piece 2T, or at the binding piece 2T On the other hand, when attaching/detaching the paper sheet 1, the paper sheet 1 is less likely to bend, and the operability of the paper sheet 1 can be improved. Furthermore, since the paper sheets 1 are less likely to bend, there is also the advantage that paper jams are less likely to occur even if they are inserted as base paper in a copier or the like.

According to the present invention, in a file that can open and fold paper sheets together with the front cover and the back cover by approximately 360 degrees with the binding tool as a fulcrum, the engagement between the leading ends of the binding pieces in the binding tool is released, and the paper is folded back. It is possible to provide a file with good operability when attaching/detaching leaves to/from a binding piece.

It is a side view of the file concerning this embodiment. FIG. 2 is a front view of the file shown in FIG. 1 in a state in which the front and back covers of the paper sheets are opened approximately 180 degrees around the binding tool as a fulcrum; In the file shown in FIG. 1, it is a drawing in which the paper sheet is folded back with the front cover and back cover opened approximately 360 degrees with the binding tool as a fulcrum, (A) showing a cross-sectional view, (B) ( The B arrow view shown to A) is shown. FIG. 2 is a cross-sectional view taken along the line AA shown in FIG. 1; 5 is a view in the direction of arrow C shown in FIG. 4; FIG. 6 is a cross-sectional view taken along the line CC shown in FIG. 5; FIG. In the file shown in FIG. 1, in a state in which the front cover and the back cover are opened approximately 180 degrees, it is a cross-sectional view of the main part when the engagement between the leading ends of the left and right binding pieces is released, (A) A cross-sectional view when the back cover is turned substantially downward is shown, and (B) is a cross-sectional view when the back cover is turned substantially sideways. FIG. 8 is a front view of the binding device shown in FIG. 7; FIG. 9 is a cross-sectional view of the DD cross section shown in FIG. 8 when the distal end portions of the left and right binding pieces are engaged with each other; FIG. 9 is a perspective view of the binding device shown in FIG. 8; FIG. 11 is an enlarged detailed view of the bearing part formed with the cam surface of the binding tool shown in FIG. ) shows a front view when the tips of the left and right binding pieces are engaged with each other. 11 is an exploded perspective view of the binding tool shown in FIG. 10; FIG. It is an expansion perspective view of the E section shown in FIG. 12, (A) shows the perspective view seen from the outer peripheral side of the binding tool, (B) shows the perspective view seen from the inner peripheral side of the binding tool. It is an expansion perspective view of the F section shown in FIG. 12, (A) shows the perspective view seen from the outer peripheral side of the binding tool, (B) shows the perspective view seen from the inner peripheral side of the binding tool. 10 is an enlarged front view of the binding device shown in FIG. 9; FIG. 15 is a sectional view of the binding device shown in FIG. 15, where (A) shows a GG sectional view, (B) shows a HH sectional view, and (C) shows an II sectional view. FIG. 16 is a front view showing a state in which the leading end of the binding piece has gone too far from the engaging position in the binding tool shown in FIG. 15; 10 is an enlarged front view of a modification of the binding device shown in FIG. 9; It is an enlarged view in the engaging part of the binding-fastener shown in FIG. 18, (A) shows the front view of an engaging part, (B) shows the horizontal sectional view of an engaging part. FIG. 3 is a front view of a modified example of the file shown in FIG. 2 in which binding holes for paper sheets are reduced; FIG. 10 is a cross-sectional view of the file described in Patent Literature 1 in a state in which the front cover and the back cover of the paper sheet are opened at approximately 360 degrees with the binding tool as a fulcrum and folded back. 22 is a partially enlarged perspective view of a binding tool in the file shown in FIG. 21; FIG. It is a cross-sectional view of another binding device, (A) shows a cross-sectional view of a state in which the tip of the binding piece is engaged, (B) is a state in which the engagement of the tip of the binding piece is released A cross-sectional view is shown.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.
First, the overall structure of the file according to this embodiment will be described in detail. Next, the structure and method of operation of the binding device of the present file will be described in detail.

<Overall structure in this file>
First, the overall structure of a file according to this embodiment will be described in detail with reference to FIGS. 1 to 4. FIG. FIG. 1 shows a side view of the file according to this embodiment. FIG. 2 shows a front view of the file shown in FIG. 1 in which the front and back covers of the paper sheets are opened at approximately 180 degrees with the binder as a fulcrum. FIG. 3 shows a drawing of the file shown in FIG. 1 in which the front cover and the back cover of the paper sheet are opened and folded back about 360 degrees with the binding tool as a fulcrum, (A) shows a cross-sectional view, (B ) shows the B arrow view shown in (A). FIG. 4 shows a sectional view taken along the line AA shown in FIG.

As shown in FIGS. 1 to 4, the file 10 of this embodiment includes a binder 2 that binds one end side of the paper sheets 1, and a front cover that is attached to the binder 2 and protects the paper sheets 1 from the outside. 31, a back cover 32, and a back cover 33 connecting the front cover 31 and the back cover 32, and the other end side of the paper sheet 1 together with the front cover 31 and the back cover 32 are 360 degrees around the binder 2 as a fulcrum. It is a file 10 that can be opened and folded back. Note that the file 10 of the present embodiment has the paper sheets 1 bound as shown in FIGS. 1 to 4, but also includes a file in which the paper sheets 1 are not bound.

The paper sheets 1 are sheets of various sizes such as A4 and B5 (JIS standard), for example. A plurality (for example, 30) are formed. The binding piece 2T of the binding tool 2 is formed so that the tip portions 2ST (2STa, 2STb) can be engaged/separated. Base end portions 2LT (2LTa, 2LTb) of the respective binding pieces 2T (2Ta, 2Tb) are connected to left and right connecting portions 21 (21a, 21b) extending in the longitudinal direction at appropriate intervals. Each binding piece 2T (2Ta, 2Tb) of the binding tool 2 is formed so as to be inserted into the binding holes 11 of the paper sheets 1 alternately in the longitudinal direction.

Further, as shown in FIGS. 1 and 2, the length in the longitudinal direction of the connecting portions 21 (21a, 21b) of the binding tool 2 is formed shorter than the length in the longitudinal direction of the paper sheets 1. As shown in FIG. The binding strips 2T (2Ta, 2Tb) that can be inserted are not formed in the plurality of (for example, two) binding holes 11 near the longitudinal ends of the paper sheet 1 . Also, the insertable binding pieces 2T (2Ta, 2Tb) are not formed in the plural (for example, eight) binding holes 11 in the vicinity of the central portion in the longitudinal direction of the paper sheets 1 .

The front cover 31, the back cover 32, and the back cover 33 are integrally formed and integrally hinged so as to be foldable. The integral hinges are preferably formed at positions abutting on both widthwise corners on the back surface of one connecting portion 21a to which the back cover 33 is fixed. The front cover 31 and the back cover 32 are formed with insertion holes 311 and 321 through which the binding pieces 2T of the binding tool 2 are inserted when the front cover 31 and the back cover 32 are closed. Front cover 31 and back cover 32 When the front cover 31 and back cover 32 are opened 360 degrees and folded back, the insertion holes 311 and 321 are separated from the binding piece 2T of the binding device 2.例文帳に追加The insertion holes 311 and 321 of the front cover 31 and the back cover 32 are formed in a substantially elliptical shape that is horizontally long in the width direction (opening direction), and the front end side in the width direction is slightly widened to avoid interference with the binding piece 2T. It is preferably formed to be bent into a key shape. A detailed structure of the binding piece 2T will be described later.

Further, as shown in FIGS. 1 and 3, the other end of the paper sheet 1 is attached to the front cover 31 at the other end 312 of the front cover 31 and the other end 322 of the back cover 32 . and shortened portions 31S and 32S which are shortened in the width direction so as to be substantially aligned with the leading end portion 12 on the other end side of the paper sheet 1 when the back cover 32 and the back cover 32 are opened approximately 360 degrees with the binding tool 2 as a fulcrum and folded back. , preferably in an appropriate region in the longitudinal direction. In this case, as shown in FIG. 3, when the other end side of the paper sheet 1 is folded with the front cover 31 and the back cover 32 at approximately 360 degrees around the binding tool 2 as a fulcrum, the contracted portions 31S and 32S are placed on the palm. The other end side of the paper sheet 1 can be stably held with one hand without shaking.

For example, on the other end side of the front cover 31 and the other end side of the back cover 32, the other end side of the paper sheet 1 is folded back with the front cover 31 and the back cover 32 at approximately 360 degrees around the binding tool 2 as a fulcrum. At this time, extended portions 312 and 322 are formed in the longitudinal upper region from the leading end portion 12 on the other end side of the paper sheet 1, and shortened portions 31S and 32S are formed to be shortened in the width direction. Curved portions 31SW, 32SW are formed in the lower region in the longitudinal direction and connect the extended portions 312, 322 and the shortened portions 31S, 32S in a concavely curved shape. are preferably formed so as to be displaced from each other in the longitudinal direction at a position where they intersect with the tip portion 12 on the other end side of the paper sheet 1 . In this case, as shown in FIG. 3B, the front cover 31 and the back cover 32, which are folded back approximately 360 degrees, are folded back by placing a finger on one of the curved portions 31SW and 32SW protruding in the longitudinal direction. It can be easily returned to the closed state.

As shown in FIGS. 1 and 4, when the paper sheets 1 and the like are normally bound by the binding tool 2 (the state before being folded approximately 360 degrees), the other end side of the front cover 31 is expanded. The portion 312 and the extended portion 322 on the other end side of the back cover 32 are formed slightly longer than the shortened portions 31S and 32S and slightly shorter than the tip portion 12 on the other end side of the paper sheet 1. can be In this case, when the other end side of the paper sheet 1 is folded about 360 degrees around the binding tool 2 together with the front cover 31 and the back cover 32, the front end portion 12 of the other end side of the paper sheet 1 is folded back. The protrusion amount of the extended portion 312 on the other end side of the cover 31 and the extended portion 322 on the other end side of the back cover 32 is reduced. Therefore, it is possible to grip the other end side of the paper sheet 1 with one hand even at locations other than the shortened portions 31S and 32S, and the gripping area can be freely selected when the paper sheet 1 is opened substantially 360 degrees, improving convenience. do.

However, in a state in which the paper sheets 1 and the like are normally bound with respect to the binding tool 2 (the state before being folded back approximately 360 degrees), the extended portion 312 on the other end side of the front cover 31 and the other end side of the back cover 32 If the extended portion 322 is formed shorter than the tip portion 12 on the other end side of the paper sheet 1, the paper sheet 1 may be stained or damaged at a place not protected by the front cover 31 and the back cover 32. may occur. In order to prevent this, it is preferable to mount mounts 1D having the same size as the paper sheet 1 between the front cover 31 and the paper sheet 1 and between the back cover 32 and the paper sheet 1. The mount 1D may be formed of a material such as cardboard or resin that protects the paper sheets 1. As shown in FIG.

Also, as shown in FIG. 1, it is preferable that a label sticker 34 is attached to the central portion of the back cover 33 in the longitudinal direction. It is preferable that the label seal 34 is stuck across the back cover 33 from one end of the front cover 31 to one end of the back cover 32 . In this case, on the label sticker 34, file names and the like can be written on the back cover 33 and the front cover 31 and back cover 32, respectively. Therefore, not only when this file 10 is stored on a bookshelf, but also when this file 10 is placed on a desk or held by hand, the file name, etc. written on the label sticker 34 can be seen. The convenience of identifying the main file 10 is improved.

As shown in FIG. 4, integral hinges may be added near the spine 33 of the front cover 31 and near the spine 33 of the back cover 32 . When the number of paper sheets 1 to be bound by the binding piece 2T (2Ta, 2Tb) increases, the front cover and/or the back cover can be bent in a chamfered shape at an obtuse angle by the integral hinges near the back cover 33. , the curved bulge of the front cover and the back cover can be avoided, and the width of the back cover 33 apparently expands to the chamfered portion, so the file name etc. to be written on the back cover 33 part of the label sticker 34 can be changed. It can be enlarged to make it easier to see.

Moreover, as shown in FIGS. 1 and 2, it is preferable that the longitudinal lengths of the front cover 31 and the back cover 32 are substantially the same as the longitudinal length of the paper sheet 1 . As described above, the length of the binder 2 in the longitudinal direction is shorter than the length of the paper sheets 1 in the longitudinal direction. Therefore, the file 10 in which the paper sheets 1 of a required size are bound can be easily accommodated even in a small bag or rucksack. In addition, the longitudinal length of the back cover 33 is formed shorter than the longitudinal length of the front cover 31 and the back cover 32, and the front cover 31 and the back cover 32 connected to the longitudinal ends of the back cover 33. The corners are preferably arc-shaped. As a result, the corners of the front cover 31 and the back cover 32 do not hurt even when touched, and even if the file 10 is stored in a small bag or the like, the bag or the like can be less likely to be damaged by the corners.

<Structure and operation method of binding tool in this file>
Next, the structure and operation method of the file binder according to the present embodiment will be described in detail with reference to FIGS. 1 to 17. FIG. FIG. 5 shows a view in the direction of arrow B shown in FIG. FIG. 6 shows a cross-sectional view taken along the line CC shown in FIG. FIG. 7 shows a cross-sectional view of the main part of the file shown in FIG. 1 when the front and back covers are opened approximately 180 degrees and the engagement between the leading ends of the left and right binding pieces is released. A) shows a cross-sectional view with the back cover facing downward, and (B) shows a cross-sectional view with the back cover facing sideways. FIG. 8 shows a front view of the binding tool shown in FIG. FIG. 9 shows a cross-sectional view of the DD cross section shown in FIG. 8 when the leading ends of the left and right binding pieces are engaged with each other. In FIG. 10, the perspective view of the binding tool shown in FIG. 8 is shown. FIG. 11 shows an enlarged detailed view of the bearing part formed with the cam surface of the binding tool shown in FIG. , (B) show a front view when the leading ends of the left and right binding pieces are engaged with each other. FIG. 12 shows an exploded perspective view of the binding tool shown in FIG. FIG. 13 shows an enlarged perspective view of the E section shown in FIG. 12, (A) shows a perspective view seen from the outer peripheral side of the binding device, and (B) shows a perspective view seen from the inner peripheral side of the binding device. show. FIG. 14 shows an enlarged perspective view of the F portion shown in FIG. 12, (A) shows a perspective view seen from the outer peripheral side of the binding device, and (B) shows a perspective view seen from the inner peripheral side of the binding device. show. FIG. 15 shows a partially enlarged front view of the binding tool shown in FIG. FIG. 16 shows a cross-sectional view of the binding tool shown in FIG. 15, (A) shows a GG cross-sectional view, (B) shows a HH cross-sectional view, and (C) shows a II cross-sectional view. show. FIG. 17 shows a front view of the binding device shown in FIG. 15 when the tip of the binding piece has gone too far from the engaging position.

As shown in FIGS. 1 to 17, the binding tool 2 of the file 10 according to the present embodiment is inserted through a plurality of binding holes 11 formed on one end side of the paper sheet 1, and is inserted inward in the width direction. Left and right binding pieces 2T (2Ta, 2Tb) formed in a substantially square annular shape when the leading end portions 2ST (2STa, 2STb) are engaged with each other, and base end portions 2LT (2LTa) of the respective binding pieces 2T (2Ta, 2Tb). , 2LTb) in the longitudinal direction at appropriate intervals, and the left and right connecting portions 21 (21a, 21b) are formed respectively, and a plurality of joints alternately arranged in the longitudinal direction. Mounted between the bearing portions 22 (22a, 22b), the rotation center shaft 23 inserted through the respective bearing portions 22 (22a, 22b) and extending in the longitudinal direction, and the left and right connecting portions 21 (21a, 21b) and a spring member 24 . A base end portion 2LT (2LTa, 2LTb) of each binding piece 2T (2Ta, 2Tb) protrudes outward in the width direction from the side wall of the left and right connecting portions 21 (21a, 21b).

Further, as shown in FIGS. 7 to 10, a back cover 33 is fixed to the back side of one of the left and right connecting portions 21a, and the front cover 31 and the back cover 32 are opened approximately 180 degrees. When the leading ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are disengaged from each other, one connecting portion 21a to which the back cover 33 is fixed and the back cover 33 are not fixed. The other connecting portion 21b is rotatable by the biasing force of the spring member 24 until the mutual opening angle α with respect to the rotation center shaft 23 is approximately 80 to 100 degrees. Here, the opening angle α is more preferably approximately 90 degrees. The spring member 24 is preferably a compression torsion coil spring 24N or a compression coil spring 24M, as will be described later, but other types of springs (eg, torsion coil springs, tension springs, etc.) can also be used. Also, different types of spring members 24 may be combined.

For example, as shown in FIG. 7A, when the bound paper sheets 1 are separated from the binding strips 2T (2Ta, 2Tb), or new paper sheets 1 are attached to the binding strips 2T (2Ta, 2Tb). In this case, with the back cover 33 facing substantially downward and the front cover 31 and the back cover 32 opened substantially 180 degrees, the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) When the engagement between them is released, the other connecting portion 21b is not easily affected by the back cover 33 connected to the front cover 31 and the back cover 32, so it is mainly affected by the biasing force of the spring member 24. 80 to 100 degrees. Therefore, the tip portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b is automatically rotated to a substantially upward posture. On the other hand, one connecting portion 21a to which the back cover 33 is fixed is restricted or restricted in rotation by the back cover 33 connected to the front cover 31 and the back cover 32 opened approximately 180 degrees. It will be. Therefore, the leading end portion 2STa of one of the binding pieces 2Ta connected to one of the connecting portions 21a is likely to be substantially maintained in a position facing inward in the width direction before the engagement is released.

Further, as shown in FIG. 7B, the left and right binding pieces 2T (2Ta, 2Tb) are attached with the back cover 33 facing substantially sideways and the front cover 31 and the back cover 32 opened substantially 180 degrees. When the engagement between the leading end portions 2ST (2STa, 2STb) is released, the other connecting portion 21b is not easily affected by the back cover 33 connected to the front cover 31 and the back cover 32. Under the influence of the biasing force of the member 24, it rotates approximately 80 to 100 degrees. Therefore, the leading end portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b is automatically rotated to a substantially horizontal orientation. On the other hand, one connecting portion 21a to which the back cover 33 is fixed is restricted or restricted in rotation by the back cover 33 connected to the front cover 31 and the back cover 32 opened approximately 180 degrees. It will be. Therefore, the leading end portion 2STa of the one binding piece 2Ta connected to the one connecting portion 21a is likely to be maintained substantially upwardly before the disengagement.

Therefore, the paper sheet 1 is held in a horizontal posture, and the paper sheet By passing the paper sheets 1 through the binding hole 11 formed on one end side of the paper sheets 1 in a substantially vertical direction, the paper sheets 1 can be easily separated from the binding strips 2T (2Ta, 2Tb), or the paper sheets 1 can be easily separated from the binding strips 2T (2Ta). , 2Tb). Therefore, when the paper sheets 1 are detached or attached, the possibility that the binding holes 11 of the paper sheets 1 are caught by the leading ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) can be greatly reduced. can. As a result, it is possible to greatly improve the operability when attaching and detaching the paper sheet 1 to and from the binding piece 2T (2Ta, 2Tb).

Further, as shown in FIGS. 9, 10 and 12, the spring member 24 is longitudinally compressed and mounted between the left and right bearing portions 22 (22a, 22b) alternately arranged in the longitudinal direction. and a compression torsion coil spring 24N spirally wound around the outer peripheral side of the rotation center shaft 23. One end edge arm portion 241 of the compression torsion coil spring 24N is connected to one connecting portion 21a to which the back cover 33 is fixed. , and the other edge arm portion 242 of the compression torsion coil spring 24N urges the other connecting portion 21b, to which the back cover 33 is not fixed, outward in the width direction. The other edge arm portion 242 of the compression torsion coil spring 24N is preferably formed in a substantially L shape so as to contact the inner side surface side and the front side of the other connecting portion 21b. In this case, the mounting position of the compression torsion coil spring 24N with respect to the other connecting portion 21b is stable, and the rotation center shaft 23 can be easily inserted through the axial center of the compression torsion coil spring 24N.

Here, one compression torsion coil spring 24N is attached near the central portion in the longitudinal direction of the connecting portion 21 (21a, 21b), but two or more may be attached. Also, the mounting position of the compression torsion coil spring 24N is not necessarily limited to the vicinity of the central portion in the longitudinal direction. In addition, the biasing force Q of the compression torsion coil spring 24N, which tends to extend in the longitudinal direction (axial direction), acts in the direction of engaging the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) with each other. Also, the biasing force R twisting in the circumferential direction acts in a direction to release the engagement between the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb).

Therefore, by directly or indirectly moving the left and right binding pieces 2T (2Ta, 2Tb) or the left and right connecting portions 21 (21a, 21b) in the longitudinal direction to opposite sides, the binding pieces 2T (2Ta, 2Tb) 2Tb), the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) are disengaged by the biasing force R of the compression torsion coil spring 24 in the twisting direction. are automatically separated in the width direction.

In this case, one end edge arm portion 241 of the compression torsion coil spring 24N urges one connecting portion 21a to which the back cover 33 is fixed toward the rear side, and the other end edge arm portion 242 of the compression torsion coil spring 24N is , the other connecting portion 21b to which the back cover 33 is not fixed is biased outward in the width direction, so that the left and right binding pieces 2T ( 2Ta, 2Tb) are disengaged from each other, most of the biasing force R in the torsional direction by the compression torsion coil spring 24N is applied to the other connecting portion to which the spine 33 is not fixed. 21b acts as a moment force to rotate outward in the width direction.

Therefore, for example, as shown in FIG. 7(A), when the back cover 33 is directed substantially downward, the distal end portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b will be compressed by the compression torsion coil spring 24N. By the biasing force R in the twisting direction, it is stably held in a substantially upward posture. On the other hand, the leading end portion 2STa of one of the binding pieces 2Ta connected to one of the connecting portions 21a to which the back cover 33 is fixed is substantially stably facing inward in the width direction before the engagement is released. maintained. Further, as shown in FIG. 7B, when the back cover 33 is oriented substantially laterally, the leading end portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b is oriented substantially laterally. While being automatically rotated to the posture, the leading end portion 2STa of the one binding piece 2Ta connected to the one connecting portion 21a is substantially stably maintained in the substantially upward posture before the engagement is released. be.

Therefore, the paper sheet 1 is gripped in a horizontal posture, and with respect to the leading end portion 2STb of the other binding strip 2Tb (or the leading end portion 2STa of the binding strip 2Ta), which is stably directed substantially upward, By making the paper sheets 1 pass through a binding hole 11 formed on one end side of the paper sheets 1 in a substantially vertical direction, the paper sheets 1 can be more easily separated from the binding pieces 2T (2Ta, 2Tb) or the paper sheets 1 can be bound. The pieces 2T (2Ta, 2Tb) can be easily installed. As a result, when the paper sheets 1 are detached or mounted, the possibility that the binding holes 11 of the paper sheets 1 are caught by the leading ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) can be further reduced. Thus, it is possible to further improve the operability when attaching and detaching the paper sheet 1 to and from the binding piece 2T (2Ta, 2Tb).

As shown in FIGS. 8 to 12, cam surfaces 221 (221a, 221b) inclined with respect to the rotation center shaft 23 are formed on the longitudinal end surfaces of the adjacent bearing portions 22 (22a, 22b). are respectively provided, and the cam surfaces 221 (221a, 221b) are separated from each other in the engaged state of the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb), and contact each other in the disengaged state It is preferably formed as follows.

Here, when the engagement between the leading ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the spine 33 is fixed as shown in FIG. 11(A). The cam surface 221a of the bearing portion 22a formed on one of the connecting portions 21a and the cam surface 221b of the bearing portion 22b formed on the other connecting portion 21b to which the back cover 33 is not fixed are rotatable in a front view. They are in contact with each other while being inclined at an angle of about 45 to 50 degrees with respect to the central axis 23 .

On the other hand, when the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are engaged with each other, the opening angle α of the left and right connecting portions 21 (21a, 21b) is 11(B), the cam surface 221b of the bearing portion 22b formed on the other connecting portion 21b to which the backstrip 33 is not fixed moves to the one to which the backstrip 33 is fixed. The cam surfaces 221a of the bearing portion 22a formed in the connecting portion 21a are rotated to a position where their inclination directions are substantially perpendicular to each other, and they are separated from each other.

Therefore, when the engagement of the distal ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the compression torsion coil spring 24N is elongated as the cam surfaces 221 (221a, 221b) come into contact with each other. The biasing force Q extending in the direction is transmitted to the bearing portions 22 (22a, 22b) on which the cam surfaces 221 (221a, 221b) are formed. Therefore, the opening angle α between the left and right connecting portions 21 (21a, 21b) is maximized via the bearing portions 22 (22a, 22b) to which the biasing force Q that the compression torsion coil spring 24N extends in the longitudinal direction is transmitted. It is possible to increase the holding power held by.

As a result, even if some external force acts, the opening angle α between the left and right connecting portions 21 (21a, 21b) can be maintained in the maximum state. As a result, as shown in FIG. 7, when the bound paper sheets 1 are separated from the binding strips 2T (2Ta, 2Tb), or when new paper sheets 1 are attached to the binding strips 2T (2Ta, 2Tb), , the separation state between the tip portions 2ST (2STa, 2STb) of the binding piece 2T (2Ta, 2Tb) (the separation distance between the tip portions 2ST (2STa, 2STb), the posture of the tip portions 2ST (2STa, 2STb), etc.) It is possible to further reduce the possibility that the binding holes 11 of the paper sheets 1 are caught by the leading ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) by maintaining them more reliably. In addition, it is possible to avoid the problem that the binding holes 11 of the paper sheets 1 are caught on the leading end portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) and the gaps between the leading end portions 2ST (2STa, 2STb) are narrowed. .

As a modification of the present embodiment, the spring member 24 is compressed in the longitudinal direction between the bearing portions 22 (22a, 22b) that are alternately arranged in the longitudinal direction. A compression coil spring 24M spirally wound on the outer peripheral side may be used. In this case, as described above, cam surfaces 221 (221a, 221b) inclined with respect to the rotation center shaft 23 are formed on the longitudinal end surfaces of the adjacent bearing portions 22 (22a, 22b). The cam surfaces 221 (221a, 221b) are spaced apart from each other when the leading ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are engaged, and come into contact with each other when the engagement is released. must be formed.

In this case, the compression coil spring 24M and the cam surface 221 (221a, 221b) cooperate to release the engagement of the distal end portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb). When the cam surfaces 221 (221a, 221b) come into contact with each other, the biasing force Q extending in the longitudinal direction of the compression coil spring 24M is applied to the bearing portions 22 (22a, 22b) on which the cam surfaces 221 (221a, 221b) are formed. ) as a rotational force. Then, based on the biasing force Q that the compression coil spring 24M extends in the longitudinal direction, the one connecting portion 21a and the other connecting portion 21b maintain the mutual opening angle α with respect to the rotation center shaft 23 in the maximum state. can be done. In addition, it is possible to avoid the problem that the binding holes 11 of the paper sheets 1 are caught on the leading end portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) and the gaps between the leading end portions 2ST (2STa, 2STb) are narrowed. .

As a result, when the bound paper sheets 1 are removed from the binding strips 2T (2Ta, 2Tb), or when new paper sheets 1 are attached to the binding strips 2T (2Ta, 2Tb), the binding strips 2T (2Ta, 2Tb) 2Tb), the distance between the tip portions 2ST (2STa, 2STb) and the attitude of the tip portions 2ST (2STa, 2STb) are reliably maintained, and the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) It is possible to further reduce the possibility that the binding hole 11 of the paper sheet 1 is caught in the binding.

Further, as shown in FIGS. 7 to 12, the bearing portions 22 (22a, 22b) provided with the cam surfaces 221 (221a, 221b) are at least near the ends of the connecting portions 21 (21a, 21b) in the longitudinal direction. It is preferable to provide In that case, when the engagement of the distal ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the biasing force Q that extends the compression torsion coil spring 24N (or the compression coil spring 24M) in the longitudinal direction is , acts directly on the cam surfaces 221 (221a, 221b) in the vicinity of the ends in the longitudinal direction to maximize the opening angle α of the connecting portions 21 (21a, 21b) even in the vicinity of the ends in the longitudinal direction of the binding device 2. state can be maintained.

Therefore, as shown in FIG. 7, when separating the bound paper sheets 1 from the binding strips 2T (2Ta, 2Tb), or when attaching new paper sheets 1 to the binding strips 2T (2Ta, 2Tb), While maintaining the separation distance between the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) in the vicinity of the ends in the longitudinal direction and the posture of the tip portions 2ST (2STa, 2STb), the binding pieces 2T (2Ta, 2Tb) 2Tb), it is possible to further reduce the possibility that the binding hole 11 of the paper sheet 1 is caught in the leading end 2ST (2STa, 2STb).

Bearing portions 22 (22a, 22b) provided with cam surfaces 221 (221a, 221b) are provided not only near the ends in the longitudinal direction of connecting portion 21 (21a, 21b), but also near the central portion in the longitudinal direction. It is preferable to provide When the engagement of the leading ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the biasing force Q extending in the longitudinal direction of the compression torsion coil spring 24N (or the compression coil spring 24M) Acting directly on each cam surface 221 (221a, 221b) near the end and near the center in the longitudinal direction, the opening angle α of the connecting part 21 (21a, 21b) in the entire longitudinal direction of the binding tool 2 It can be kept in maximum condition.

Moreover, the bearing portions 22 (22a, 22b) provided with the cam surfaces 221 (221a, 221b) are provided at least in the vicinity of the longitudinal ends of the connecting portions 21 (21a, 21b). Since the opening angle α of the connecting portions 21 (21a, 21b) in the vicinity of the ends of the direction can be maintained in the maximum state, the torsional rigidity in the longitudinal direction of the connecting portions 21 (21a, 21b) can be complemented. can be done. Therefore, for example, the compression torsion coil spring 24N (or the compression coil spring 24M) is formed more compactly (for example, the spring diameter and wire diameter are reduced, the spring length is reduced, etc.), and the thickness of the connecting portion 21 (21a, 21b) is reduced. (width direction dimension) can be formed as thin as possible. Therefore, as shown in FIG. 3A, when the other end side of the paper sheet 1 is folded 360 degrees around the binding tool 2 together with the front cover 31 and the back cover 32, one end of the paper sheet 1 The gap W between the front cover 31 and the back cover 32 due to the side connecting parts 21 (21a, 21b) can be reduced, and the range in which the front cover 31 and the back cover 32 can be brought into close contact can be expanded. As a result, it is possible to reduce discomfort (for example, fluffy feeling) when writing on the folded paper sheet 1 .

In addition, by making the thickness (width dimension) of the connecting portions 21 (21a, 21b) as thin as possible, the thickness of the book file 10 when the front cover 31 and the back cover 32 are returned to the original closed state is reduced. , the thickness of the front cover 31 and the back cover 32 plus the thickness of the paper sheet 1. The book files 10 can be arranged and stored efficiently on a bookshelf or the like. In this case, the spine 33 of the file 10 is not hidden by the adjacent files 10. - 特許庁Therefore, the file name written on the label sticker 34 attached to the back cover 33 is easy to see, and the identification of the stored main file 10 can be improved.

In general, if the compression torsion coil spring 24N is made compact, the biasing force R in the torsion direction is also weakened, making it difficult to maintain the maximum opening angle α between the one connecting portion 21a and the other connecting portion 21b. . Therefore, in the conventional structure, in order to maintain the maximum opening angle α, the compression torsion coil spring 24N must be enlarged. In order to prevent this, the thickness (width dimension) of the connecting portions 21 (21a, 21b) could not be made thin.

As shown in FIGS. 7 and 9, the left and right binding pieces 2T (2Ta, 2Tb) of the bookbinding tool 2 are formed to have U-shaped cross sections facing each other, and the other binding piece to which the back cover 33 is not fixed. The depth d2 of the U-shaped cross-sectional bottom portion 2KTb at the base end portion 2LTb with respect to the tip portion 2STb of the other binding piece 2Tb connected to the connecting portion 21b is connected to the one connecting portion 21a to which the back cover 33 is fixed. It is preferable that the depth d1 of the U-shaped cross-sectional bottom portion 2KTa at the base end portion 2LTa with respect to the tip portion 2STa of the other binding piece 2Ta is formed larger than the depth d1.

In this case, the front cover 31 and the back cover 32 are opened approximately 180 degrees with the back cover 33 facing substantially downward, and the engagement between the leading ends 2STa and 2STb of the left and right binding pieces 2Ta and 2Tb is released. At this time, the amount of inward protrusion in the width direction of the tip portion 2STa of one binding piece 2Ta relative to the U-shaped cross-sectional bottom portion 2KTa is reduced, while the tip portion of the other binding piece 2Tb relative to the U-shaped cross-sectional bottom portion 2KTb is reduced. It is possible to increase the amount of protrusion of 2STb substantially upward.

When the bound paper sheets 1 are separated from the binding strips 2T (2Ta, 2Tb), or when new paper sheets 1 are attached to the binding strips 2T (2Ta, 2Tb), the amount of protrusion substantially upward is A larger number of paper sheets 1 can be attached/detached at one time to/from the increased leading end portion 2STb of the other binding piece 2Tb. In addition, by reducing the amount of inward protrusion in the width direction of the leading end portion 2STa from the bottom portion 2KTa of the U-shaped section of one of the binding pieces 2Ta, when the paper sheet 1 is moved substantially in the vertical direction, the paper sheet It is possible to reduce the possibility that the one end side of the class 1 is caught by the leading end portion 2STa of one binding piece 2Ta. As a result, it is possible to further improve the operability when attaching/detaching the paper sheet 1 to/from the binding piece 2T.

As shown in FIG. 4, the U-shaped cross-sectional bottom portions 2KTa and 2KTb are connected to the left and right connecting portions 21 when the tip portions 2ST (2STa and 2STb) of the left and right binding pieces 2T (2Ta and 2Tb) are engaged with each other. It is preferable that they are formed outside (21a, 21b) in the width direction and substantially parallel to each other. As a result, more paper sheets 1 can be bound while minimizing the width dimension of the binding piece 2T (2Ta, 2Tb). Even in this case, it is preferable to form the corners (bending portions) of the left and right binding pieces 2T (2Ta, 2Tb) formed in a U-shaped cross section in an arc shape. As a result, even when more paper sheets 1 are folded 360 degrees around the binding piece 2T (2Ta, 2Tb), the binding hole 11 is caught by the corner (bent portion) of the binding piece 2T (2Ta, 2Tb). You can turn it around smoothly without any hassle.

In addition, as shown in FIG. 9, in the other binding piece 2Tb, the position where the root of the base end portion 2LTb projecting obliquely outward from the side wall of the other connecting portion 21b and the U-shaped cross-sectional bottom portion 2KTb intersect. is preferably an obtuse angle of about 100 to 120 degrees. In this case, there is an advantage that it is easy to avoid deformation of the binding hole 11 when many paper sheets 1 are folded 360 degrees through the deep U-shaped cross-sectional bottom portion 2KTb with a depth d2. As a result, it is possible to further improve the operability when folding the paper sheet 1 360 degrees.

Further, as shown in FIG. 12, at least two or more bearing portions 22 (22a, 22b) among the plurality of bearing portions 22 (22a, 22b) formed in the left and right connecting portions 21 (21a, 21b) are Bearing pieces 22Na, 22Ma, 22Nb, and 22Mb opening in opposite directions in the width direction are formed by connecting them in the longitudinal direction when the leading ends 2STa and 2STb of the left and right binding pieces 2Ta and 2Tb are engaged with each other. is preferred.

For example, the bearing portion 22a formed in one connecting portion 21a includes a bearing piece 22Na that opens inward in the width direction in a substantially U shape, and a bearing piece 22Ma that opens in a substantially U shape outward in the width direction. However, two or more bearing portions 22a connected in the longitudinal direction are formed. The bearing portion 22b formed in the other connecting portion 21b has a bearing piece 22Nb that opens inward in the width direction in a substantially U shape, and a bearing piece 22Mb that opens in a substantially U shape outward in the width direction. However, two or more bearing portions 22b connected in the longitudinal direction are formed. A bearing portion 22a formed at the longitudinal end portion of one connecting portion 21a is formed with a rib 22Ta for preventing the rotation center shaft 23 from coming off. A notch groove 221Ta is formed in the retaining rib 22Ta so that the rotation center shaft 23 can be inserted while being bent. Therefore, it is possible to prevent the rotation center shaft 23 from unintentionally slipping out of the bearing portions 22 (22a, 22b).

7 and 9, the bearing pieces 22Na, 22Ma, 22Nb, and 22Mb, which are open in opposite directions to each other, allow the rotation of the joints 21 (21a, 21b) regardless of the angle of opening. The bearing pieces 22Na, 22Ma, 22Nb, and 22Mb cannot be radially separated from the central shaft 23, and the fitting state of the bearing portions 22 (22a, 22b) to the rotation central shaft 23 can always be maintained. Moreover, by connecting the bearing pieces 22Na, 22Ma, 22Nb, and 22Mb that are opened in opposite directions in the width direction, the strength of each opening can be increased.

Therefore, as shown in FIGS. 7 and 9, the engagement between the tip portions 2STa and 2STb of the left and right binding pieces 2T (2Ta and 2Tb) is released, and the opening angle α of the left and right connecting portions 21 (21a and 21b) The fitting state of the bearing portions 22 (22a, 22b) with respect to the rotation center shaft 23 can be normally maintained even if the angle is approximately 80 to 100 degrees. As a result, when the bound paper sheets 1 are removed from the binding strips 2T (2Ta, 2Tb), or when new paper sheets 1 are attached to the binding strips 2T (2Ta, 2Tb), the binding strips 2T (2Ta, 2Tb) 2Tb) are more reliably kept apart from each other to further reduce the possibility that the binding holes 11 of the paper sheets 1 are caught by the leading ends 2STa and 2STb of the binding pieces 2T (2Ta and 2Tb). can be further reduced.

Further, as shown in FIGS. 7, 9, and 12, in the bookbinding tool 2, the rotation center shaft 23 is positioned with respect to the width direction center line CL of one connecting portion 21a to which the spine cover 33 is fixed. It is preferably arranged at a position eccentric by a predetermined width d3 toward the other connecting portion 21b to which the cover 33 is not fixed. In this case, the stopper portions 212a and 212b that release the engagement between the tip portions 2STa and 2STb of the left and right binding pieces 2Ta and 2Tb and hold the opening angle α of the left and right connecting portions 21 (21a and 21b) in the maximum state. can be formed on the width direction side surface side of one connection portion 21a and the rear surface side of the other connection portion 21b. Therefore, the stopper portions 212a and 212b can be provided at suitable positions in the longitudinal direction while ensuring the thickness necessary for the strength in the width direction of the one connecting portion 21a and the other connecting portion 21b.

In addition, by providing the stopper portions 212a and 212b at suitable positions in the longitudinal direction of the connecting portions 21 (21a and 21b), the opening angle α between the left and right connecting portions 21 (21a and 21b) can be substantially reduced in the longitudinal direction. can be held evenly. As a result, when separating the bound paper sheets 1 from the binding strips 2T (2Ta, 2Tb), or when attaching new paper sheets 1 to the binding strips 2T (2Ta, 2Tb), the binding strips 2Ta, 2Tb The distance between the tip parts 2STa and 2STb is maintained substantially even in the longitudinal direction of the binding tool 2 to further reduce the possibility that the binding hole 11 of the paper sheet 1 is caught by the tip part 2STb of the binding piece 2Tb. be able to.

Further, as shown in FIGS. 1, 5, and 6, in the bookbinding device 2, on the back side of one connecting portion 21a, a base portion 211P standing at a symmetrical position with respect to the central portion in the longitudinal direction and the corresponding A claw portion 211T is formed wider than the base portion 211P, and a plurality of claw-shaped locking portions 211 are formed in which the claw portions 211T protrude from the upper end of the base portion 211P toward the central portion in the longitudinal direction, and The back cover 33 is formed with a locking hole 33H having an elongated hole shape of different diameter, through which the claw portion 211T passes through the large diameter portion 331, and is sandwiched between the claw portions 211T in a state where the small diameter portion 332 is engaged with the base portion 211P. preferably.

In this case, for example, a space material (not shown) is inserted between the back surface of one connecting portion 21a and the center of the spine 33 in the longitudinal direction to bend the center of the spine 33 in the longitudinal direction into a mountain shape. After the claw portion 211T is passed through the large-diameter portion 331 of the locking hole 33H, the space material is removed, and the central portion in the longitudinal direction of the back cover 33 is returned to a flat state, and the locking hole 33H is closed. With the base portion 211P engaged with the small diameter portion 332, the small diameter portion 332 of the locking hole 33H can be sandwiched and restrained by the claw portion 211T. Note that the claw portion 221T is preferably formed in an oval shape in the longitudinal direction.

As a result, the back cover 33 can be easily fixed to the back side of the one connecting portion 21a, and there is no need to attach a new fixing member for fixing the back cover 33 to the one connecting portion 21a. As a result, the structure of one connecting portion 21a for fixing the back cover 33 is simplified, and as shown in FIG. The gap W between the front cover 31 and the back cover 32 due to the connection part 21 (21a, 21b) on one end side of the paper sheet 1 can be minimized when the paper sheet 1 is opened 360 degrees and folded back, and the front cover 31 and the back cover 31 can be minimized. Since it is possible to expand the range of close contact with the sheet 32, it is possible to further reduce discomfort (fluffy feeling) when writing on the folded paper sheet 1 or the like.

In addition, after the claw portion 211T is passed through the large-diameter portion 331 of the locking hole 33H in a state in which the central portion in the longitudinal direction of the back cover 33 is curved in a mountain shape, the central portion in the longitudinal direction of the back cover 33 is flattened. In the state where the base portion 211P is engaged with the small diameter portion 332 of the locking hole 33H, the small diameter portion 332 of the locking hole 33H can be pinched and restrained by the claw portion 211T. This eliminates the need for a process and equipment for fixing to the rear side of the connecting portion 21a by welding or caulking, which can contribute to cost reduction.

In addition, the claw-shaped engaging portion 211 is formed in an L shape in a side view by connecting the base portion 211P and the claw portion 211T. The small diameter portion 332 is connected to the longitudinal center side of the large diameter portion 331 . On the back side of one connecting portion 21a, there is a slight recess portion 21H around the base portion 211P so as to facilitate insertion of the locking hole 33H while minimizing the outward protrusion amount of the claw portion 211T. formed. By forming the recessed portion 21H, the gap between the back surface of one connecting portion 21a and the inner surface of the claw portion 211T is increased. can be secured.

In addition, in order to secure a space for affixing the label seal 34 in the central portion in the longitudinal direction of the back cover 33, the hook-shaped engaging portion 211 is formed in the central portion in the longitudinal direction of one of the connecting portions 21a. Absent. Here, as shown in FIG. 1, on the back side of one connecting portion 21a, except for the central portion in the longitudinal direction, symmetrical portions with respect to the central portion in the longitudinal direction are arranged at positions close to each other. Two hook-shaped engaging portions 211 are formed at locations near the center and ends in the longitudinal direction, respectively. As a result, the back cover 33 can be easily attached to one of the connecting portions 21a and is difficult to come off. By arranging the two claw-shaped locking portions 211 close to each other, the appearance of the back cover 33 is also improved.

2, 9, and 15, in the bookbinding device 2, the base ends 2LTa and 2LTb (2KTa, 2KTb) of the left and right binding pieces 2Ta and 2Tb It is preferable that the plate width d4 or more in the longitudinal direction be formed so as to be displaced from each other in the longitudinal direction. Further, the tip portions 2STa and 2STb of the left and right binding pieces 2Ta and 2Tb project inward in the width direction by a predetermined length from the tip side of the base end portions 2LTa and 2LTb, and also inward in the width direction. It is preferable that engaging portions 2GTa and 2GTb that engage with each other are formed at inclined portions 2QTa and 2QTb that are inclined in the longitudinal direction. As a result, when a plurality of files 10 provided with bookbinding tools 2 are stacked in the width direction and stored in a bookshelf or the like, interference between the binding tools 2 of adjacent files 10 can be avoided, and file storage in a bookshelf or the like is possible. number can be increased.

Further, as shown in FIGS. 12 to 17, the engaging portions 2GTa and 2GTb formed at the tip portions 2STa and 2STb of the left and right binding pieces 2Ta and 2Tb are formed in a mountain shape in the plate width direction of the inclined portions 2QTa and 2QTb. Projecting convex portions 2GT1a and 2GT1b are formed on the tip side, and the concave portions 2GT2a and 2GT2b engage with the mating convex portions 2GT1a and 2GT1b in the plate width direction of the inclined portions 2QTa and 2QTb, and the mating convex portions 2GT1a and 2GT1b. It is preferable that receiving portions 2GT3a and 2GT3b that engage with the inclined portions 2QTa and 2QTb in the plate inner-outer direction are formed on the base end side. Abutting surfaces 2GT12a and 2GT12b formed so as to be able to contact the receiving portions 2GT3a and 2GT3b are formed on the plate inner sides of the convex portions 2GT1a and 2GT1b. As a result, the engaging portions 2GTa and 2GTb are reliably engaged with each other in the plate width direction and the plate inner/outer direction of the inclined portions 2QTa and 2QTb, and inadvertent disengagement can be avoided. Therefore, the paper sheets 1 can be opened and folded at approximately 360 degrees with the binding tool 2 as a fulcrum together with the front cover 31 and the back cover 32 without anxiety.

Among the engaging portions 2GT (2GTa, 2GTb) formed at the tip portions 2STa, 2STb of the left and right binding pieces 2Ta, 2Tb, one of the engaging portions 2GTa is connected with the convex portion 2GT1a and the receiving portion 2GT3a. A vertical wall portion 2GT4a is formed along the boundary between the convex portion 2GT1a and the receiving portion 2GT3a, and the other engaging portion 2GTb has a groove portion 2GT4b between the convex portion 2GT1b and the receiving portion 2GT3b for escaping the vertical wall portion 2GT4a. It is preferable that the tip portion 2STb is formed from the plate outer surface to the plate inner surface. In this case, when the engagement portions 2GT (2GTa, 2GTb) are engaged with each other, the protrusions 2GT1a and 2GT1b go too far in the width direction with respect to the counterpart recesses 2GT2a and 2GT2b and do not return. can be effectively avoided by

In other words, in the left and right binding pieces 2T (2Ta, 2Tb), the engaging portions 2GT (2GTa, 2GTb) are stretched in the longitudinal direction by the biasing force Q that tends to expand the compression torsion coil spring 24N (or the compression coil spring 24M) in the longitudinal direction. are pressed into contact with each other. Therefore, when the vertical wall portion 2GT4a is not formed, when the convex portions 2GT1a and 2GT1b of the engaging portion 2GT (2GTa and 2GTb) extend beyond the opposing concave portions 2GT2a and 2GT2b in the width direction, the convex portions The crests 2GT11 (2GT11a, 2GT11b) of the portions 2GT1a, 2GT1b are caught on the side walls of the inclined portions 2QT (2QTa, 2QTb) inclined from the width direction to the longitudinal direction in the tip portions 2STa, 2STb, and the convex portions 2GT1a, 2GT1b are In some cases, it may not return to the position where it engages with the recesses 2GT2a and 2GT2b. Then, when the sheet 1 is to be folded approximately 360 degrees in a state in which the projections 2GT1a and 2GT1b do not return to the positions where they engage with the recesses 2GT2a and 2GT2b, the binding hole 11 of the sheet 1 is bent by the binding piece 2T. There is a problem that the paper sheet 1 is torn because it does not pass through the leading ends 2STa and 2STb of (2Ta, 2Tb).

However, here, of the engaging portions 2GT (2GTa, 2GTb), one of the engaging portions 2GTa has a vertical wall portion 2GT4a that connects the convex portion 2GT1a and the receiving portion 2GT3a. Since the convex portions 2GT1a and 2GT1b are formed along the boundary portions, even if the convex portions 2GT1a and 2GT1b extend beyond the opposing concave portions 2GT2a and 2GT2b in the width direction, the convex portions 2GT1a thickened by the vertical wall portions 2GT4a can be formed. Since the crest 2GT11a abuts on the entire side wall of the inclined portion 2QTb at the opposing tip 2STb, it becomes easier to slip and the crest 2GT11a of the convex 2GT1a is less likely to get caught on the opposing inclined portion 2QTb. As a result, the projections 2GT1a and 2GT1b can easily return to the positions where they engage with the counterpart recesses 2GT2a and 2GT2b. Therefore, the operation of engaging and releasing the engaging portions 2GT (2GTa, 2GTb) formed at the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) of the binding tool 2 can be performed more easily. can be done. In addition, since the projections 2GT1a and 2GT1b can be easily returned to the positions where they engage with the recesses 2GT2a and 2GT2b, when the paper sheet 1 is folded back approximately 360 degrees, the binding hole 11 of the paper sheet 1 is aligned with the binding piece 2T (2Ta, 2Tb) can be smoothly passed through the tip portions 2STa and 2STb, and the problem of tearing the paper sheet 1 can be prevented.

In addition, the protrusions 2GT1a and 2GT1b are formed to have different protrusion amounts d5 and d6 protruding in the plate width direction, and the protrusion 2GT1a having a large protrusion amount d5 is formed in a substantially trapezoidal shape when viewed from the front, The convex portion 2GT1b with a small protrusion amount d6 is also preferably formed in a substantially triangular shape when viewed from the front. When the engaging portions 2GT (2GTa, 2GTb) are engaged with each other, the protrusions 2GT1a and 2GT1b go too far in the width direction with respect to the opposing recesses 2GT2a and 2GT2b and do not return. This can be effectively avoided by the difference between the quantities d5 and d6.

In other words, in the left and right binding pieces 2T (2Ta, 2Tb), the engaging portions 2GT (2GTa, 2GTb) are stretched in the longitudinal direction by the biasing force Q that tends to expand the compression torsion coil spring 24N (or the compression coil spring 24M) in the longitudinal direction. are pressed into contact with each other. Therefore, when the protrusions 2GT1a and 2GT1b have the same protrusion amount d5 and d6 protruding in the plate width direction, the protrusions 2GT1a and 2GT1b of the engaging portions 2GT (2GTa and 2GTb) correspond to the other recesses. 2GT2a, 2GT2b, when the width direction is excessive, the top portions 2GT11a, 2GT11b of both the left and right convex portions 2GT1a, 2GT1b are inclined from the width direction to the longitudinal direction at the tip portions 2STa, 2STb of the other party 2QT ( 2QTa, 2QTb), the projections 2GT1a, 2GT1b become more difficult to return to the positions where they engage with the recesses 2GT2a, 2GT2b.

However, here, the protrusions 2GT1a and 2GT1b are formed to have different protrusion amounts d5 and d6 that protrude in the plate width direction, and the protrusion 2GT1a having a large protrusion amount d5 is formed in a substantially trapezoidal shape and protrudes. Since the protrusions 2GT1b with a small amount d6 are formed in a substantially triangular shape, even if the protrusions 2GT1a and 2GT1b extend beyond the opposing recesses 2GT2a and 2GT2b in the width direction, the protrusions with a large protrusion amount d5 are formed. Only the portion 2GT1a abuts on the inclined portion 2QTb of the mating tip portion 2STb, and the convex portion 2GT1b with a small protrusion amount d6 does not abut on the slant portion 2qTa of the mating tip portion 2STa. Also, since the convex portion 2GT1a with a large protrusion amount d5 is formed in a substantially trapezoidal shape, it becomes easy to slip on the inclined portion 2QTb, and the peak portion 2GT11a of the convex portion 2GT1a is less likely to be caught on the opposing inclined portion 2QTb. As a result, the projections 2GT1a and 2GT1b can easily return to the positions where they engage with the counterpart recesses 2GT2a and 2GT2b. Therefore, the operation of engaging and releasing the engaging portions 2GT (2GTa, 2GTb) formed at the tip portions 2STa, 2STb of the binding pieces 2T (2Ta, 2Tb) of the binding tool 2 can be performed more easily.

<Effect>
As described in detail above, according to the file 10 according to the present embodiment, the binding tool 2 has the binding holes 11 and 311 formed at one end sides of the paper sheets 1, the front cover 31 and the back cover 32, respectively. , 321 and are formed in a substantially square annular shape when the front ends 2ST (2STa, 2STb) facing inward in the width direction are engaged with each other, and each binding piece 2T. Formed in left and right connecting portions 21 (21a, 21b) and left and right connecting portions 21 (21a, 21b) that connect the base ends 2LT (2LTa, 2LTb) of (2Ta, 2Tb) at appropriate intervals in the longitudinal direction, respectively. A plurality of bearing portions 22 (22a, 22b) alternately arranged in the longitudinal direction, a rotation center shaft 23 inserted through each bearing portion 22 (22a, 22b) and extending in the longitudinal direction, left and right and a spring member 24 mounted between the connecting portions 21 (21a, 21b). 31 and the back cover 32 are opened approximately 180 degrees, and when the engagement between the leading ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the spine cover 33 is fixed. One connecting portion 21a and the other connecting portion 21b to which the back cover 33 is not fixed are rotated by the biasing force of the spring member 24 until the mutual opening angle α with respect to the rotation center axis 23 is approximately 80 to 100 degrees. Since it is formed movably, when separating the bound paper sheets 1 from the binding strip 2T (2Ta, 2Tb), or when attaching a new paper sheet 1 to the binding strip 2T (2Ta, 2Tb) For example, with the back cover 33 facing substantially downward and the front cover 31 and the back cover 32 opened substantially 180 degrees, the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are attached to each other. When the engagement is released, the other connecting portion 21b is not easily affected by the back cover 33 connected to the front cover 31 and the back cover 32, so it is mainly affected by the biasing force of the spring member 24. It rotates approximately 80 to 100 degrees. Therefore, the tip portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b is automatically rotated to a substantially upward posture. On the other hand, one connecting portion 21a to which the spine cover 33 is fixed is rotated by the spine cover 33 connected to the front cover 31 and the back cover 32, which are opened approximately 180 degrees. be regulated or restricted. Therefore, the leading end portion 2STa of one of the binding pieces 2Ta connected to one of the connecting portions 21a is likely to be substantially maintained in a position facing inward in the width direction before the engagement is released.

Further, for example, with the back cover 33 facing substantially sideways and the front cover 31 and the back cover 32 opened substantially 180 degrees, the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) ) are disengaged from each other, the other connecting portion 21b is less likely to be affected by the spine 33 connected to the front cover 31 and the back cover 32, so it is mainly affected by the biasing force of the spring member 24. It receives and rotates approximately 80 to 100 degrees. Therefore, the leading end portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b is automatically rotated to a substantially horizontal orientation. On the other hand, one connecting portion 21a to which the back cover 33 is fixed is restricted or restricted in rotation by the back cover 33 connected to the front cover 31 and the back cover 32 opened approximately 180 degrees. Become. Therefore, the leading end portion 2STa of the one binding piece 2Ta connected to the one connecting portion 21a is likely to be maintained substantially upwardly before the disengagement.

Therefore, the paper sheet 1 is held in a horizontal posture, and the paper sheet By passing the paper sheets 1 through the binding hole 11 formed on one end side of the paper sheets 1 in a substantially vertical direction, the paper sheets 1 can be easily separated from the binding strips 2T (2Ta, 2Tb), or the paper sheets 1 can be easily separated from the binding strips 2T (2Ta). , 2Tb). Therefore, when the paper sheets 1 are detached or attached, the possibility that the binding holes 11 of the paper sheets 1 are caught by the leading ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) can be greatly reduced. can. As a result, it is possible to greatly improve the operability when attaching and detaching the paper sheet 1 to and from the binding piece 2T (2Ta, 2Tb).

As described above, according to the present embodiment, in the file 10 in which the paper sheet 1 can be opened and folded at approximately 360 degrees around the binding tool 2 together with the front cover 31 and the back cover 32, the binding piece in the binding tool 2 To provide a file 10 having good operability when attaching/detaching a paper sheet 1 to/from a binding piece 2T (2Ta, 2Tb) by disengaging the leading end portions 2ST (2STa, 2STb) of 2T (2Ta, 2Tb). can do.

Further, according to the present embodiment, the spring member 24 is mounted while being compressed in the longitudinal direction between the bearing portions 22 (22a, 22b) that are alternately arranged in the longitudinal direction. One end edge arm portion 241 of the compression torsion coil spring 24N urges one connecting portion 21a to which the back cover 33 is fixed to the back side, The other edge arm portion 242 of the compression torsion coil spring 24N urges the other connecting portion 21b to which the back cover 33 is not fixed outward in the width direction. With the front cover 31 and the back cover 32 opened approximately 180 degrees, when the engagement between the tips 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the compression and twisting coil springs 24N twist. Most of the directional biasing force R acts as a moment force that rotates the other connecting portion 21b to which the back cover 33 is not fixed outward in the width direction.

Therefore, for example, when the back cover 33 is directed downward, the leading end portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b is stabilized by the biasing force R in the twisting direction of the compression torsion coil spring 24N. It is held in a substantially upward posture. On the other hand, the leading end portion 2STa of one of the binding pieces 2Ta connected to one of the connecting portions 21a to which the back cover 33 is fixed is substantially stably facing inward in the width direction before the engagement is released. maintained. Also, when the back cover 33 is turned to the side, the leading end portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b is changed to a position facing substantially laterally, while the one connecting portion The leading end portion 2STa of one of the binding pieces 2Ta connected to the portion 21a is substantially stably maintained in a substantially upward posture before the disengagement.

Therefore, the paper sheet 1 is gripped in a horizontal posture, and with respect to the leading end portion 2STb of the other binding strip 2Tb (or the leading end portion 2STa of the binding strip 2Ta), which is stably directed substantially upward, By making the paper sheets 1 pass through a binding hole 11 formed on one end side of the paper sheets 1 in a substantially vertical direction, the paper sheets 1 can be more easily separated from the binding pieces 2T (2Ta, 2Tb) or the paper sheets 1 can be bound. The pieces 2T (2Ta, 2Tb) can be easily installed. As a result, when the paper sheets 1 are detached or mounted, the possibility that the binding holes 11 of the paper sheets 1 are caught by the leading ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) can be further reduced. Thus, it is possible to further improve the operability when attaching and detaching the paper sheet 1 to and from the binding piece 2T (2Ta, 2Tb).

In addition, according to the present embodiment, cam surfaces 221 (221a, 221b) that are inclined with respect to the rotation center shaft 23 are provided on the longitudinal end surfaces of the adjacent bearing portions 22 (22a, 22b). , The cam surfaces 221 (221a, 221b) are formed so as to be separated from each other when the leading ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are engaged, and to contact each other when the engagement is released. Therefore, when the engagement of the distal end portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the cam surfaces 221 (221a, 221b) come into contact with each other, and the compression torsion coil spring is formed. The biasing force Q that 24N extends in the longitudinal direction is transmitted to the bearing portions 22 (22a, 22b) on which the cam surfaces 221 (221a, 221b) are formed.

Therefore, the holding force of the opening angle α between the left and right connecting portions 21 (21a, 21b) is increased through the bearing portions 22 (22a, 22b) to which the biasing force Q that the compression torsion coil spring 24N extends in the longitudinal direction is transmitted. can be enhanced. Therefore, the opening angle α between the left and right connecting portions 21 (21a, 21b) can be maintained at its maximum. As a result, when the bound paper sheets 1 are removed from the binding strips 2T (2Ta, 2Tb), or when new paper sheets 1 are attached to the binding strips 2T (2Ta, 2Tb), the binding strips 2T (2Ta, 2Tb) 2Tb), the separation state between the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) is more reliably maintained, and the binding holes 11 of the paper sheets 1 are formed in the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb). can further reduce the possibility of getting caught.

According to this embodiment, the spring member 24 is longitudinally compressed and attached between the bearing portions 22 (22a, 22b) alternately arranged in the longitudinal direction, and is mounted on the outer peripheral side of the rotation center shaft 23. The compression coil spring 24M is spirally wound, and cam surfaces 221 (221a, 221b) that are inclined with respect to the rotation center axis 23 are formed on the longitudinal end surfaces of the adjacent bearing portions 22 (22a, 22b). ) are provided, respectively, and the cam surfaces 221 (221a, 221b) are separated from each other when the leading ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are engaged, and contact each other when the engagement is released. Since they are formed so as to contact each other, when the engagement of the leading ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the cam surfaces 221 (221a, 221b) come into contact with each other. , the urging force Q that the compression coil spring 24M extends in the longitudinal direction is transmitted as a rotational force to the bearing portions 22 (22a, 22b) on which the cam surfaces 221 (221a, 221b) are formed.

Therefore, based on the urging force Q that the compression coil spring 24M extends in the longitudinal direction, the opening angle α between the one connecting portion 21a and the other connecting portion 21b with respect to the rotation center shaft 23 is approximately 80 to 100 degrees. can rotate up to As a result, when the bound paper sheets 1 are removed from the binding strips 2T (2Ta, 2Tb), or when new paper sheets 1 are attached to the binding strips 2T (2Ta, 2Tb), the binding strips 2T (2Ta, 2Tb) 2Tb) are surely maintained in a separated state, and the binding holes 11 of the paper sheets 1 are caught by the leading ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb). Possibilities can be further reduced.

Further, according to the present embodiment, the bearing portions 22 (22a, 22b) provided with the cam surfaces 221 (221a, 221b) are provided at least in the vicinity of the longitudinal ends of the connecting portions 21 (21a, 21b). , when the distal ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are disengaged, the biasing force Q extending in the longitudinal direction of the compression torsion coil spring 24N (or the compression coil spring 24M) is applied to the cam surface. 221 (221a, 221b), the opening angle α of the connecting portion 21 (21a, 21b) can be maintained in the maximum state even in the vicinity of the ends of the binding device 2 in the longitudinal direction. Therefore, when removing the bound paper sheets 1 from the binding strips 2T (2Ta, 2Tb), or when attaching new paper sheets 1 to the binding strips 2T (2Ta, 2Tb), in the vicinity of the ends in the longitudinal direction The paper sheets 1 are bound to the leading ends 2ST (2STa, 2STb) of the binding strips 2T (2Ta, 2Tb) while maintaining the separated state between the leading ends 2ST (2STa, 2STb) of the binding strips 2T (2Ta, 2Tb). It is possible to further reduce the possibility of the hole 11 being caught.

In addition, since the opening angle α of the connecting portions 21 (21a, 21b) in the vicinity of the ends in the longitudinal direction of the binding device 2 can be maintained at the maximum state, Torsional rigidity can be complemented. Therefore, for example, the compression torsion coil spring 24N or the compression coil spring 24M can be formed more compactly, and the thickness (width dimension) of the connecting portion 21 (21a, 21b) can be formed as thin as possible. Therefore, when the other end side of the paper sheet 1 is folded 360 degrees with the binding tool 2 as a fulcrum together with the front cover 31 and the back cover 32, the connecting portions 21 (21a, 21b) at one end of the paper sheet 1 ) can be reduced between the front cover 31 and the back cover 32, and the range in which the front cover 31 and the back cover 32 can be brought into close contact with each other can be expanded. As a result, it is possible to reduce discomfort (for example, fluffy feeling) when writing on the folded paper sheet 1 . In addition, by making the thickness (width dimension) of the connecting portions 21 (21a, 21b) as thin as possible, the thickness of the book file 10 when the front cover 31 and the back cover 32 are returned to the original closed state is reduced. , the thickness of the front cover 31 and the back cover 32 plus the thickness of the paper sheet 1, and the file 10 can be stored without being affected by the thickness (width dimension) of the connecting portions 21 (21a, 21b). They can be efficiently stored by arranging them on a bookshelf or the like. In this case, the file name, etc. written on the sticker attached to the back cover 33 can be easily seen, and the identifiability of the stored main file 10 can be improved.

Further, according to the present embodiment, the base ends 2LT (2LTa, 2LTb) of the left and right binding pieces 2T (2Ta, 2Tb) are displaced from each other in the longitudinal direction by a dimension equal to or greater than the plate width d4 in the longitudinal direction. The leading end portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) protrude inward in the width direction by a predetermined length from the leading end side of the base end portions 2LT (2LTa, 2LTb) and extend in the width direction. Since the engaging portions 2GT (2GTa, 2GTb) that engage with each other are formed at the inclined portions 2QT (2QTa, 2QTb) that are inclined in the longitudinal direction from the position protruding inward, a plurality of files 10 can be superimposed on each other. When the files are stored in a bookshelf or the like, interference between the binders 2 of adjacent files 10 can be avoided, and the number of files stored in the bookshelf or the like can be increased.

In addition, on the engaging portion 2GT (2GTa, 2GTb), convex portions 2GT1a and 2GT1b projecting in the longitudinal direction in the plate width direction of the inclined portions 2QTa and 2QTb in mountain shapes are formed on the tip side of the engaging portion 2GT (2GTa and 2GTb). , 2GT1b in the plate width direction of the inclined portions 2QTa, 2QTb, and receiving portions that engage the opposite convex portions 2GT1a, 2GT1b in the plate inner/outer direction of the inclined portions 2QTa, 2QTb. Since 2GT3a and 2GT3b are formed on the base end side, the engaging portions 2GT (2GTa and 2GTb) are reliably engaged with each other in the plate width direction and the plate inner/outer direction of the inclined portions 2QTa and 2QTb, thereby preventing carelessness. Disengagement can be avoided. Therefore, the paper sheets 1 can be opened and folded at approximately 360 degrees with the binding tool 2 as a fulcrum together with the front cover 31 and the back cover 32 without anxiety.

Further, of the engaging portions 2GT (2GTa, 2GTb) formed at the tip portions 2STa, 2STb of the left and right binding pieces 2Ta, 2Tb, one engaging portion 2GTa has a convex portion 2GT1a on the peak portion 2GT11a of the convex portion 2GT1a. and the receiving portion 2GT3a is formed from the plate outer surface to the plate inner surface of the tip portion 2STa. Since the groove 2GT4b is formed from the plate outer surface to the plate inner surface of the tip portion 2STb, when the engaging portions 2GT (2GTa, 2GTb) are engaged with each other, the convex portion 2GT1a , 2GT1b go too far in the width direction and do not return can be effectively avoided by the vertical wall portion 2GT4a.

In other words, in the left and right binding pieces 2T (2Ta, 2Tb), the engaging portions 2GT (2GTa, 2GTb) are stretched in the longitudinal direction by the biasing force Q that tends to expand the compression torsion coil spring 24N (or the compression coil spring 24M) in the longitudinal direction. are pressed into contact with each other. Therefore, when the vertical wall portion 2GT4a is not formed, when the convex portions 2GT1a and 2GT1b of the engaging portion 2GT (2GTa and 2GTb) extend beyond the opposing concave portions 2GT2a and 2GT2b in the width direction, the convex portions The crests 2GT11 (2GT11a, 2GT11b) of the portions 2GT1a, 2GT1b are caught on the side walls of the inclined portions 2QT (2QTa, 2QTb) inclined from the width direction to the longitudinal direction in the tip portions 2STa, 2STb, and the convex portions 2GT1a, 2GT1b are In some cases, it may not return to the position where it engages with the recesses 2GT2a and 2GT2b. Then, when the sheet 1 is to be folded approximately 360 degrees in a state in which the projections 2GT1a and 2GT1b do not return to the positions where they engage with the recesses 2GT2a and 2GT2b, the binding hole 11 of the sheet 1 is bent by the binding piece 2T. There is a problem that the paper sheet 1 is torn because it does not pass through the leading ends 2STa and 2STb of (2Ta, 2Tb).

However, in the present embodiment, one engaging portion 2GTa of the engaging portions 2GT (2GTa, 2GTb) has a vertical wall portion 2GT4a connecting the convex portion 2GT1a and the receiving portion 2GT3a. Since the protrusions 2GT1a and 2GT1b are formed along the boundaries of the 2GT3a, even if the protrusions 2GT1a and 2GT1b extend beyond the opposing recesses 2GT2a and 2GT2b in the width direction, the protrusions are thickened by the vertical wall portions 2GT4a. Since the peak 2GT11a of 2GT1a abuts on the entire side wall of the inclined portion 2QTb at the tip 2STb of the other party, it becomes easy to slip and the peak 2GT11a of the convex portion 2GT1a is less likely to get caught on the inclined portion 2QTb of the other party.

As a result, the projections 2GT1a and 2GT1b can easily return to the positions where they engage with the counterpart recesses 2GT2a and 2GT2b. Therefore, the operation of engaging and releasing the engaging portions 2GT (2GTa, 2GTb) formed at the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) of the binding tool 2 can be performed more easily. can be done. In addition, since the projections 2GT1a and 2GT1b can be easily returned to the positions where they engage with the recesses 2GT2a and 2GT2b, when the paper sheet 1 is folded back approximately 360 degrees, the binding hole 11 of the paper sheet 1 is aligned with the binding piece 2T (2Ta, 2Tb) can be smoothly passed through the tip portions 2STa and 2STb, and the problem of tearing the paper sheet 1 can be prevented.

Further, according to the present embodiment, when the convex portion 2GT1b of the other engaging portion 2GTb and the concave portion 2GT2a of the one engaging portion 2GTa are engaged with each other, the convex portion 2GT1b abuts on the distal end side in the width direction of the convex portion 2GT1b. The contact surfaces 2GT12b, 2GT22a (TS1) of the recessed portion 2GT2a are inclined at a predetermined angle γ2 with respect to the plate width direction (TS2) of the inclined portions 2QTa, 2QTb, and the vertical wall portion of one engaging portion 2GTa. The tip side end surface 2GT41a of 2GT4a and the tip side end surface 2GT31b of the receiving portion 2GT3b in the other engaging portion 2GTb are substantially parallel or abutting surfaces 2GT12b and 2GT22a with respect to the plate width direction (TS2) of the inclined portions 2QTa and 2QTb. (TS1) is inclined at a predetermined angle γ3 in the direction opposite to (TS1), and is formed so as to have a minute gap d7 at the time of engagement. When a load is applied in the direction, the tip side end surface 2GT41a of the vertical wall portion 2GT4a of one engaging portion 2GTa and the tip side end surface 2GT31b of the receiving portion 2GT3b of the other engaging portion 2GTb are immediately brought into contact with each other. Between the side end surfaces 2GT41a and 2GT31b, there is a pressing force PP that presses each other in a direction orthogonal to the plate width direction (TS2) of the inclined portions 2QTa and 2QTb or in a direction in which the engaging portions 2GT (2GTa and 2GTb) are engaged with each other. works.

Therefore, a frictional force proportional to the pressing force PP can be generated between the tip end surfaces 2GT41a and 2GT31b. Further, the pressing force PP presses each other in a direction perpendicular to the plate width direction (TS2) of the inclined portions 2QTa and 2QTb or in a direction in which the engaging portions 2GT (2GTa and 2GTb) are engaged with each other. There is no force component in the direction of releasing the engagement between 2GTa and 2GTb. Therefore, even when a load is applied in the width direction to the left and right binding pieces 2T (2Ta, 2Tb), the contact surfaces 2GT12b and 2GT22a of the convex portion 2GT1b and the concave portion 2GT2a are disengaged by the pressing force PP. It is possible to suppress the movement in the direction QQ and avoid the deviation of the convex portion 2GT1b and the concave portion 2GT2a. As a result, it is possible to effectively control the deformation, crushing, etc. of the left and right binding pieces 2T (2Ta, 2Tb) due to the load in the width direction of the binding device 2 .

Further, according to the present embodiment, the protrusions 2GT1a and 2GT1b are formed to have different protrusion amounts d5 and d6 that protrude in the plate width direction, and the protrusion 2GT1a having a large protrusion amount d5 has, when viewed from the front, The convex portion 2GT1b, which is formed in a substantially trapezoidal shape and has a small protrusion amount d6, is also formed in a substantially triangular shape when viewed from the front. The problem that the protrusions 2GT1a and 2GT1b go too far in the width direction and do not return to the recesses 2GT2a and 2GT2b can be effectively avoided by the difference in the protrusion amounts d5 and d6 of the protrusions 2GT1a and 2GT1b.

In other words, in the left and right binding pieces 2T (2Ta, 2Tb), the engaging portions 2GT (2GTa, 2GTb) are stretched in the longitudinal direction by the biasing force Q that tends to expand the compression torsion coil spring 24N (or the compression coil spring 24M) in the longitudinal direction. are pressed into contact with each other. Therefore, when the protrusions 2GT1a and 2GT1b have the same protrusion amount d5 and d6 protruding in the plate width direction, the protrusions 2GT1a and 2GT1b of the engaging portions 2GT (2GTa and 2GTb) correspond to the other recesses. 2GT2a, 2GT2b, when the width direction is excessive, the top portions 2GT11a, 2GT11b of both the left and right convex portions 2GT1a, 2GT1b are inclined from the width direction to the longitudinal direction at the tip portions 2STa, 2STb of the other party 2QT ( 2QTa, 2QTb), the projections 2GT1a, 2GT1b become more difficult to return to the positions where they engage with the recesses 2GT2a, 2GT2b.

However, in the present embodiment, the protrusions 2GT1a and 2GT1b are formed to have different protrusion amounts d5 and d6 in the plate width direction, and the protrusion 2GT1a having a large protrusion amount d5 is formed in a substantially trapezoidal shape. Since the protrusions 2GT1b with a small protrusion amount d6 are formed in a substantially triangular shape, even if the protrusions 2GT1a and 2GT1b go too far in the width direction with respect to the opposing recesses 2GT2a and 2GT2b, the protrusion amount d5 is reduced. Only the large convex portion 2GT1a abuts on the inclined portion 2QTb of the mating tip portion 2STb, and the convex portion 2GT1b with a small protrusion amount d6 does not abut on the inclined portion 2qTa of the mating tip portion 2STa. Also, since the convex portion 2GT1a with a large protrusion amount d5 is formed in a substantially trapezoidal shape, it becomes easy to slip on the inclined portion 2QTb, and the peak portion 2GT11a of the convex portion 2GT1a is less likely to be caught on the opposing inclined portion 2QTb. As a result, the projections 2GT1a and 2GT1b can easily return to the positions where they engage with the counterpart recesses 2GT2a and 2GT2b. Therefore, the operation of engaging and releasing the engaging portions 2GT (2GTa, 2GTb) formed at the tip portions 2STa, 2STb of the binding pieces 2T (2Ta, 2Tb) of the binding tool 2 can be performed more easily.

Further, according to the present embodiment, the protrusions 2GT1a and 2GT1b protrude in the plate width direction with substantially the same protrusion amounts d5 and d6, and the contact surfaces TSM on which the protrusions 2GT1a and 2GT1b contact each other are As viewed from the front, the engaging portions 2GT (2GTa, 2GTb) are inclined at a predetermined angle γ with respect to the longitudinal direction, so that the engaging portions 2GT (2GTa, 2GTb) are attached to the binding pieces 2T (2Ta, 2Tb). Even if a load is applied in the direction in which the protrusions 2GT1a and 2GT1b come off in the longitudinal direction, the contact surface TSM between the protrusions 2GT1a and 2GT1b contacting each other at a negative angle with respect to the longitudinal direction effectively prevents the protrusions 2GT1a and 2GT1b from coming off each other. can be made

Further, according to the present embodiment, the left and right binding pieces 2T (2Ta, 2Tb) are formed to have U-shaped cross sections facing each other, and are connected to the other connecting portion 21b to which the back cover 33 is not fixed. The depth d2 of the U-shaped cross-sectional bottom portion 2KTb at the base end portion 2LTb with respect to the tip portion 2STb of the binding piece 2Tb is the tip of the one binding piece 2Ta connected to the one connection portion 21a to which the back cover 33 is fixed. Since the depth d1 of the U-shaped cross-sectional bottom portion 2KTa at the base end portion 2LTa with respect to the portion 2STa is formed larger than the depth d1, the back cover 33 is directed downward, and the front cover 31 and the back cover 32 are opened approximately 180 degrees. Then, when the engagement between the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the width direction of the tip portion 2STa with respect to the U-shaped cross-sectional bottom portion 2KTa of one binding piece 2Ta While the amount of inward protrusion is reduced, it is possible to increase the amount of protrusion of the leading end portion 2STb substantially upward from the bottom portion 2KTb of the U-shaped cross section of the other binding piece 2Tb.

Therefore, when separating the bound paper sheets 1 from the binding strips 2T (2Ta, 2Tb), or when attaching new paper sheets 1 to the binding strips 2T (2Ta, 2Tb), the amount of protrusion substantially upward is A larger number of paper sheets 1 can be attached/detached at one time to/from the increased leading end portion 2STb of the other binding piece 2Tb. In addition, by reducing the amount of inward protrusion in the width direction of the leading end portion 2STa from the bottom portion 2KTa of the U-shaped section of one of the binding pieces 2Ta, when the paper sheet 1 is moved substantially in the vertical direction, the paper sheet It is possible to reduce the possibility that the one end side of the class 1 is caught by the leading end portion 2STa of one binding piece 2Ta. As a result, it is possible to further improve the operability when attaching/detaching the paper sheet 1 to/from the binding piece 2T (2Ta, 2Tb).

Further, according to the present embodiment, at least two or more of the plurality of bearing portions 22 (22a, 22b) formed in the left and right connecting portions 21 (21a, 21b) are Bearing pieces 22Na, 22Ma, 22Nb, and 22Mb, which open in opposite directions in the width direction, are connected in the longitudinal direction in a state where the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are engaged with each other. Therefore, even if the opening angle α between the connecting portions 21 (21a, 21b) changes to any angle, the bearing pieces 22Na, 22Ma, 22Nb, and 22Mb opening in the opposite direction allow the rotation from the central axis 23. The bearing pieces 22Na, 22Ma, 22Nb, and 22Mb cannot be separated in the radial direction, and the fitting state of the bearing portions 22 (22a, 22b) to the rotation center shaft 23 can be maintained.

Therefore, the engagement between the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, and the opening angle α of the left and right connecting portions 21 (21a, 21b) becomes approximately 80 to 100 degrees. Even then, the fitting state of the bearing portions 22 (22a, 22b) to the rotation center shaft 23 can be maintained. As a result, when the bound paper sheets 1 are removed from the binding strips 2T (2Ta, 2Tb), or when new paper sheets 1 are attached to the binding strips 2T (2Ta, 2Tb), the binding strips 2T (2Ta, 2Tb) 2Tb), the separation state between the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) is more reliably maintained, and the binding holes 11 of the paper sheets 1 are formed in the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb). can further reduce the possibility of getting caught.

Further, according to the present embodiment, the center axis of rotation 23 is positioned so that the other connecting portion 21b, to which the back cover 33 is not fixed, is positioned relative to the width direction center line CL of the one connecting portion 21a, to which the back cover 33 is fixed. Since the ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are disengaged from each other, the left and right connecting portions 21 (21a, 21b) are disengaged. Stopper portions 212a and 212b for maintaining the maximum opening angle α can be formed on the width direction side surface of one connecting portion 21a and the rear surface side of the other connecting portion 21b. Therefore, the stopper portions 212a and 212b can be provided at suitable positions in the longitudinal direction while ensuring the necessary widthwise thickness of the one connecting portion 21a and the other connecting portion 21b.

Further, by providing the stopper portions 212a and 212b at suitable positions in the longitudinal direction, the opening angle α between the left and right connecting portions 21 (21a and 21b) can be kept substantially equal in the longitudinal direction. As a result, when the bound paper sheets 1 are separated from the binding strips 2T (2Ta, 2Tb), or when new paper sheets 1 are attached to the binding strips 2T (2Ta, 2Tb), binding in the entire longitudinal direction While maintaining a substantially uniform distance between the tip portions 2ST (2STa, 2STb) of the pieces 2T (2Ta, 2Tb), the paper sheets 1 are attached to the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb). It is possible to further reduce the possibility that the binding hole 11 is caught.

Further, according to the present embodiment, on the back side of one connecting portion 21a, there are a base portion 211P standing symmetrically with respect to the central portion in the longitudinal direction, and a claw portion 211T formed wider than the base portion 211P. A plurality of claw-shaped locking portions 211 are formed in which the claw portions 211T protrude from the tip of the base portion 211P toward the central portion in the longitudinal direction. 211T passes through and is sandwiched between the claw portions 211T in a state where the small diameter portion 332 is engaged with the base portion 211P. After the claw portion 211T is passed through the large-diameter portion 331 of the locking hole 33H in the curved state, the central portion in the longitudinal direction of the back cover 33 is returned to a flat state, and the small-diameter portion of the locking hole 33H is flattened. With the base portion 211P engaged with 332, the small diameter portion 332 of the locking hole 33H can be sandwiched and restrained by the claw portion 211T.

Therefore, the back cover 33 can be easily fixed to the back side of the one connecting portion 21a, and there is no need to attach a new fixing member for fixing the back cover 33 to the one connecting portion 21a. As a result, the structure of one connecting portion 21a for fixing the back cover 33 is simplified, and the other end side of the paper sheet 1 is opened and folded back about 360 degrees with the binding tool 2 as a fulcrum together with the front cover 31 and back cover 32. The gap W between the front cover 31 and the back cover 32 due to the connection part 21 (21a, 21b) on one end side of the paper sheet 1 can be minimized when the paper sheet 1 is folded, and the feeling of discomfort when writing on the folded paper sheet 1 can be minimized. (For example, fluffy feeling) can be further reduced.

In addition, after the claw portion 211T is passed through the large-diameter portion 331 of the locking hole 33H in a state in which the central portion in the longitudinal direction of the back cover 33 is curved in a mountain shape, the central portion in the longitudinal direction of the back cover 33 is flattened. In the state where the base portion 211P is engaged with the small diameter portion 332 of the locking hole 33H, the small diameter portion 332 of the locking hole 33H can be pinched and restrained by the claw portion 211T. This eliminates the need for a process and equipment for fixing to the rear side of the connecting portion 21a by welding or caulking, which can contribute to cost reduction.

Further, according to the present embodiment, the other end side of the paper sheet 1 is attached to the other end side of the front cover 31 and the other end side of the back cover 32 together with the front cover 31 and the back cover 32 with the binder 2 as a fulcrum. When folded to open approximately 360 degrees, extended portions 312 and 322 are formed in the upper region in the longitudinal direction and are formed to be shortened in the width direction from the tip portion 12 on the other end side of the paper sheet 1. The front cover 31 and the back cover 32 are provided with curved portions 31SW and 32SW that connect the extended portions 312 and 322 and the shortened portions 31S and 32S in a concave curved shape. Both curved portions 31SW and 32SW are formed to be displaced from each other in the longitudinal direction at positions where they intersect with the tip portion 12 on the other end side of the paper sheet 1. By putting a finger on one of the 32SW, the front cover 31 and the back cover 32, which have been folded back approximately 360 degrees, can be easily returned to the original closed state. Therefore, in a file in which the paper sheets 1 can be opened and folded at approximately 360 degrees around the binding tool 2 together with the front cover 31 and the back cover 32, the front cover 31 and the back cover 32 folded back approximately 360 degrees can be folded back to the original position. It is also possible to provide a file with good operability for returning to the closed state.

Further, according to the present embodiment, since the paper sheets 1 are formed with fewer binding holes 11 than the JIS standard paper, when the paper sheets 1 are folded approximately 360 degrees along the binding piece 2T, or When attaching/detaching the paper sheet 1 to/from the binding piece 2T, the paper sheet 1 is less likely to bend, and the operability of the paper sheet 1 can be improved. Furthermore, since the paper sheets 1 are less likely to bend, there is also the advantage that paper jams are less likely to occur even if they are inserted as base paper in a copier or the like.

<Modification>
Needless to say, this embodiment can be modified without changing the gist of the invention. For example, in the present embodiment, the left and right binding pieces 2T (2Ta, 2Tb) are formed in U-shaped cross sections facing each other, and are connected to the other connecting portion 21b to which the spine 33 is not fixed. The depth d2 of the U-shaped cross-sectional bottom portion 2KTb at the base end portion 2LTb with respect to the tip portion 2STb of the piece 2Tb is the tip portion 2STa of the one binding piece 2Ta connected to the one connection portion 21a to which the back cover 33 is fixed. Although it is formed larger than the depth d1 of the bottom portion 2KTa of the U-shaped cross section at the base end portion 2LTa, it is not necessarily limited to this.

For example, the left and right binding pieces 2T (2Ta, 2Tb) are formed to have U-shaped cross-sections facing each other, and the tip of the other binding piece 2Tb is connected to the other connection portion 21b to which the back cover 33 is not fixed. The depth d2 of the U-shaped cross-sectional bottom portion 2KTb at the base end portion 2LTb with respect to 2STb is the base end portion 2LTa with respect to the tip portion 2STa of the one binding piece 2Ta connected to the one connection portion 21a to which the back cover 33 is fixed. It may be formed substantially the same as the depth d1 of the U-shaped cross-sectional bottom portion 2KTa in .

In addition, a plurality of types of other binding pieces 2Tb having different depths d2 of the U-shaped cross-sectional bottom portion 2KTb with respect to the leading end portion 2STb are prepared, and according to the number of paper sheets 1 to be bound, the back cover 33 is fixed to one side. may be combined with one of the binding pieces 2Ta connected to the connecting portion 21a. In this case, a common mold can be used for molding the binding piece 2Ta and the connecting portion 21a. The binding tool 2 with different binding numbers can be easily manufactured at low cost.

Further, in the present embodiment, as shown in FIG. 17, in the engaging portions 2GT (2GTa, 2GTb) of the left and right binding pieces 2T (2Ta, 2Tb), the protrusions 2GT1a, 2GT1b protrude in the plate width direction. d5 and d6 are formed to be different from each other, and the convex portion 2GT1a with a large amount of protrusion d5 is formed in a substantially trapezoidal shape when viewed from the front, and the convex portion 2GT1b with a small amount of protrusion d6 is also formed in a substantially trapezoidal shape when viewed from the front. Although formed in a triangular shape, it is not necessarily limited to this.

For example, as shown in FIG. 18, the protrusions 2GT1a and 2GT1b have protrusion amounts d5 and d6 that protrude in the plate width direction, and the contact surfaces TSM on which the protrusions 2GT1a and 2GT1b contact each other are formed to be substantially the same. , may be inclined at a predetermined angle γ with respect to the longitudinal direction at a negative angle when viewed from the front. In this case, even if a load is applied to the binding piece 2T (2Ta, 2Tb) in the direction in which the engaging portion 2GT (2GTa, 2GTb) is disengaged in the longitudinal direction, the protrusion that contacts the binding piece 2T (2Ta, 2Tb) at a negative angle with respect to the longitudinal direction The contact surface TSM between the portions 2GT1a and 2GT1b can effectively prevent the protrusions 2GT1a and 2GT1b from coming off from each other.

Further, for example, as shown in FIGS. 18 and 19, when the convex portion 2GT1b of the other engaging portion 2GTb engages with the concave portion 2GT2a of the one engaging portion 2GTa, the tip of the convex portion 2GT1b in the width direction is contacted. The contact surfaces 2GT13b and 2GT22a (TS1) of the convex portion 2GT1b and the concave portion 2GT2a in contact with each other are inclined at a predetermined angle γ2 with respect to the plate width direction (TS2) of the inclined portions 2QTa and 2QTb. The tip side end surface 2GT41a of the vertical wall portion 2GT4a in 2GTa and the tip side end surface 2GT31b of the receiving portion 2GT3b in the other engaging portion 2GTb are substantially parallel to or in contact with the plate width direction (TS2) of the inclined portions 2QTa and 2QTb. The contact surfaces 2GT13b and 2GT22a (TS1) may be inclined at a predetermined angle γ3 in the direction opposite to the contact surfaces 2GT13b and 2GT22a (TS1), and may be formed so as to have a minute gap d7 when engaged. It should be noted that the angle γ3 is preferably smaller than the angle γ2, and the minute gap d7 is a gap that does not interfere with the tip side end surfaces 2GT41a and 2GT31b when the engaging portions 2GT (2GTa and 2GTb) are engaged with each other. good.

In this case, when a load is applied in the width direction to the left and right binding pieces 2T (2Ta, 2Tb), the leading edge side end surface 2GT41a of the vertical wall portion 2GT4a in one engaging portion 2GTa and the other engaging portion 2GTb immediately contacts the tip side end surface 2GT31b of the receiving portion 2GT3b, and between the tip side end surfaces 2GT41a and 2GT31b, a direction orthogonal to the plate width direction (TS2) of the inclined portions 2QTa and 2QTb or the engaging portion 2GT (2GTa, 2GTb) are pressed against each other in a direction to engage each other with a pressing force PP. Therefore, a frictional force proportional to the pressing force PP can be generated between the tip end surfaces 2GT41a and 2GT31b. In addition, since the pressing force PP presses each other in a direction perpendicular to the plate width direction (TS2) of the inclined portions 2QTa and 2QTb or in a direction in which the engaging portions 2GT (2GTa and 2GTb) are engaged, at least the engaging portions 2GTa , 2GTb does not generate a force component in the direction of disengagement from each other. Therefore, even when a load is applied in the width direction to the left and right binding pieces 2T (2Ta, 2Tb), the contact surfaces 2GT13b and 2GT22a of the convex portion 2GT1b and the concave portion 2GT2a are disengaged by the pressing force PP. It is possible to suppress the movement in the direction QQ and avoid the deviation of the convex portion 2GT1b and the concave portion 2GT2a. As a result, it is possible to effectively control the deformation, crushing, etc. of the left and right binding pieces 2T (2Ta, 2Tb) due to the load in the width direction of the binding device 2 .

Further, in the present embodiment, the paper sheets 1 are sheets of various sizes such as A4 and B5 (JIS standard), for example, and the binding piece 2T of the binding tool 2 is attached to one end side of the paper sheets 1. A plurality of (for example, 30) binding holes 11 to be inserted are formed, but it is not necessarily limited to the paper sheets 1 described above. For example, as shown in FIG. 20, paper sheets 1 formed with fewer binding holes 11 than JIS standard paper may be provided. In this case, when the paper sheet 1 is folded approximately 360 degrees along the binding piece 2T, or when the paper sheet 1 is attached to or detached from the binding piece 2T, the paper sheet 1 is less likely to bend. 1 can be improved. Furthermore, since the paper sheets 1 are less likely to bend, there is also the advantage that paper jams are less likely to occur even if they are inserted as base paper in a copier or the like.

INDUSTRIAL APPLICABILITY The present invention can be used as a file that can open and fold paper sheets together with the front cover and the back cover by approximately 360 degrees with a binding tool as a fulcrum.

1 Sheets 1D Backing paper 2 Binding tool 2T, 2Ta, 2Tb Binding piece 2GT, 2GTa, 2GTb Engagement part 2GT1a, 2GT1b Convex part 2GT11a, 2GT11b Peak part 2GT13b, 2GT22a Contact surface 2GT2a, 2GT2b Concave part 2GT3a, 2GT2GT3b Receiving part Tip side end face 2GT4a Vertical wall part 2GT41a Tip side end face 2GT4b Groove part 2KT, 2KTa, 2KTb U-shaped cross-sectional bottom part 2LT, 2LTa, 2LTb Base end part 2QTa, 2QTb Inclined part 2ST, 2STa, 2STb Tip part 10 File 11 Binding hole 12 Distal end portions 21, 21a, 21b Connecting portions 22, 22a, 22b Bearing portion 23 Rotation center shaft 24 Spring member 24N Compression torsion coil spring 24M Compression coil spring 31 Front cover 32 Back cover 33 Back cover 33H Locking hole 211 Hook-shaped locking portion 211P Base 211T Claws 221, 221a, 221b Cam surfaces 241, 242 End edge arms 311, 321 Binding holes 312, 322 Expanded parts 31S, 32S Shortened parts 31SW, 32SW Curved part 331 Large diameter part 332 Small diameter part CL Width direction center line STM contact surface α opening angle γ1, γ2, γ3 angle

Claims (16)

A binder that binds one end side of paper sheets, a front cover and a back cover that are attached to the binder and protect the paper sheets from the outside, and a back cover that connects the front cover and the back cover. A file capable of opening and folding the other end side of the paper sheet together with the front cover and the back cover 360 degrees with the binding tool as a fulcrum,
The binding tool includes
Left and right binding pieces that are inserted into a plurality of binding holes formed on one end side of the paper sheet and are formed in a substantially square annular shape when the leading ends facing inward in the width direction are engaged with each other;
Left and right connecting portions that connect the base end portions of the binding pieces in the longitudinal direction at appropriate intervals;
a plurality of bearing portions respectively formed in the left and right connecting portions and arranged alternately in the longitudinal direction;
a rotation center shaft inserted through each of the bearing portions and extending in the longitudinal direction;
and a spring member mounted between the left and right connecting portions,
The back cover is fixed to the back side of one of the left and right connecting parts,
With the front cover and the back cover opened approximately 180 degrees, when the engagement between the leading ends of the left and right binding pieces is released, one of the connecting portions to which the back cover is fixed and the back cover. The other connecting portion that is not fixed is rotatable to a state where the mutual opening angle with respect to the rotation center axis is approximately 80 to 100 degrees by the biasing force of the spring member. file. In the file recited in claim 1,
The spring member is a compression torsion coil spring that is longitudinally compressed and mounted between the bearing portions that are alternately arranged in the longitudinal direction, and is helically wound around the rotation center shaft. ,
One end edge arm portion of the compression torsion coil spring urges one of the connection portions to which the spine is fixed to the back side, and the other end edge arm portion of the compression torsion coil spring is adapted to urge the back cover. A file characterized in that the other connecting portion that is not fixed is biased outward in the width direction. In the file recited in claim 2,
Cam surfaces inclined with respect to the central axis of rotation are provided on longitudinal end surfaces of the bearing portions formed on the left and right connecting portions, respectively,
A file, wherein the cam surfaces are formed so as to be separated from each other when the leading ends of the left and right binding pieces are in an engaged state and to abut each other in an disengaged state. In the file recited in claim 1,
The spring member is a compression coil spring that is longitudinally compressed and mounted between the bearing portions that are alternately arranged in the longitudinal direction, and is helically wound around the rotation center shaft,
Cam surfaces inclined with respect to the central axis of rotation are provided on longitudinal end surfaces of the bearing portions formed on the left and right connecting portions, respectively,
A file, wherein the cam surfaces are formed so as to be separated from each other when the leading ends of the left and right binding pieces are in an engaged state and to abut each other in an disengaged state. In the file described in claim 3 or claim 4,
A file according to claim 1, wherein the bearing portion provided with the cam surface is provided at least in the vicinity of a longitudinal end portion of the connecting portion. In the file according to any one of claims 2 to 5,
the base end portions of the left and right binding pieces are formed to have a dimension equal to or greater than the plate width in the longitudinal direction and are displaced from each other in the longitudinal direction;
At the distal end portions of the left and right binding pieces, there is provided an inclined portion projecting inward in the width direction from the distal end side of the base end portion by a predetermined length and inclined in the longitudinal direction from the position projecting inward in the width direction. Engagement portions that engage with each other are formed,
The engaging portion has a convex portion protruding in a mountain shape in the plate width direction of the inclined portion on the tip side, and a concave portion that engages with the mating convex portion in the plate width direction of the inclined portion. A file characterized in that a receiving portion that engages with the mating convex portion in the plate inner-outer direction of the inclined portion is formed on the base end side. In the file recited in claim 6,
In one of the engaging portions, a vertical wall portion connecting the convex portion and the receiving portion is formed along a boundary portion between the convex portion and the receiving portion. A file characterized in that a groove part for escaping the vertical wall part is formed in the part from the plate outer surface to the plate inner surface of the other engaging part between the convex part and the receiving part. In the file recited in claim 7,
When the convex portion of the other engaging portion and the concave portion of the one engaging portion are engaged with each other, the contact surfaces of the convex portion and the concave portion, which are in contact with each other on the front end side in the width direction of the convex portion, formed in an inclined shape at a predetermined angle with respect to the plate width direction of the inclined portion,
The tip side end surface of the vertical wall portion in the one engaging portion and the tip side end surface of the receiving portion in the other engaging portion are substantially parallel to or in contact with the plate width direction of the inclined portion. A file characterized by being inclined at a predetermined angle in a direction opposite to a surface and formed so as to have a minute gap when engaged. In the file according to any one of claims 6 to 8,
The protrusions protrude in the plate width direction by substantially the same amount, and the contact surfaces on which the protrusions abut against each other are negative angles at a predetermined angle with respect to the longitudinal direction when viewed from the front. A file characterized by being formed with an inclination toward the In the file according to any one of claims 6 to 8,
The projecting amount of the projecting portion projecting in the plate width direction is formed to be different from each other,
A file according to claim 1, wherein the convex portion with a large amount of protrusion is formed in a substantially trapezoidal shape, and the convex portion with a small amount of protrusion is formed in a substantially triangular shape. In the file according to any one of claims 1 to 10,
The left and right binding pieces are formed to have U-shaped cross-sections facing each other, and the base ends of the binding pieces are connected to the other binding piece connected to the other connection portion to which the back cover is not fixed. The depth of the bottom of the U-shaped cross-section is formed larger than the depth of the bottom of the U-shaped cross-section at the base end with respect to the tip of one of the binding pieces connected to the one of the connecting portions to which the back cover is fixed. A file characterized by In the file according to any one of claims 1 to 11,
Of the plurality of bearing portions formed in the left and right connecting portions, at least two or more of the bearing portions are opened in opposite directions in the width direction when the leading ends of the left and right binding pieces are engaged with each other. A file characterized by the fact that the strips are formed by connecting them in the longitudinal direction. In the file according to any one of claims 1 to 12,
The rotation center axis is arranged at a position eccentric to the width direction center line of the one connecting portion to which the back cover is fixed, toward the other connecting portion to which the back cover is not fixed. A file characterized by In the file according to any one of claims 1 to 13,
On the back side of one of the connecting parts, there is a base standing symmetrically with respect to the central part in the longitudinal direction, and claws formed wider than the base. A plurality of claw-shaped locking portions protruding toward the direction center portion side are formed,
The back cover is formed with a locking hole having a large diameter portion through which the claw portion passes and a small diameter portion that is engaged with the base portion and is sandwiched between the claw portions. file that features. In the file according to any one of claims 1 to 14,
On the other end side of the front cover and the other end side of the back cover, when the other end side of the paper sheet is folded back with the front cover and the back cover opened approximately 360 degrees around the binding tool as a fulcrum, Forming an enlarged portion in the longitudinal upper region that is enlarged in the width direction from the tip of the other end of the paper sheet, and forming a shortened portion that is shortened in the width direction in the longitudinal lower region, A curved portion connecting the extended portion and the shortened portion in a concave curved shape,
A file characterized in that both the curved portions of the front cover and the back cover are formed so as to be displaced from each other in the longitudinal direction at positions where they intersect with the leading edge of the other end of the paper sheet. In the file according to any one of claims 1 to 15,
A file characterized by having paper sheets formed with fewer binding holes than JIS standard paper.

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