JP7592285B2 - Spacer member and spacer file set - Google Patents

Description

The present invention relates to a spacer member and a spacer file set, and more specifically to a spacer member that can be attached to a file that can open and fold back paper sheets bound with a detachable binder, and that closes the gaps caused by the binder when the paper sheets are opened and folded back by approximately 360 degrees, and a spacer file set to which the spacer member is attached. In this case, the file also includes a sketchbook for binding drawing paper.

If a file can open and fold paper sheets approximately 360 degrees around the binding device as a fulcrum, it is possible to hold the 360-degree folded file in one hand even in a small space such as a train and easily read the text written on the folded paper sheets, or easily perform the required writing or drawing on the folded paper sheets. For this reason, files that can be folded 360 degrees are generally popular and are widely used around the world. The above-mentioned files that can be folded 360 degrees are disclosed, for example, in Patent Document 1 and Patent Document 2.

That is, as shown in Figures 30 and 31, Patent Document 1 discloses a sketchbook 100 in which drawing paper 103 having a row of binding holes 102 at an edge 101 is bound together by a binding device 105 having a binding ring 104 inserted through binding holes 102a of the row of binding holes 102. With this sketchbook 100, the drawing paper 103 can be opened and folded back approximately 360 degrees with the binding ring 104 as a fulcrum.

In addition, since the drawing paper 103 is bound by the binding ring 104 inserted through the binding hole 102a of the binding hole row 102, even when the drawing paper 103 is opened 360 degrees around the binding ring 104 as a fulcrum and folded back, the drawing paper 103 on the front side and the drawing paper 103 on the back side are in close contact with each other and no gaps are created between them. Therefore, when attempting to draw or the like on the drawing paper 103 folded back 360 degrees, the drawing paper 103 does not bend and can be written on properly.

In addition, a break line 106 is formed in the drawing paper 103 near the location where the binding hole row 102 is formed, and the drawing paper 103 can be broken at the location where the break line 106 is formed. When removing the drawing paper 103 from the sketchbook 100, one of the multiple sheets of drawing paper 103 bound together by the binding rings 104 is pulled as shown by arrow P and torn along the break line 106. In this way, the drawing paper 103 to be removed from the sketchbook 100 can be easily broken straight at the location where the break line 106 was formed. Therefore, unnecessary drawing paper 103 can be easily removed from the sketchbook 100.

On the other hand, as shown in FIG. 32, Patent Document 2 discloses a file 200 that includes paper sheets 201, a binding device 202 that binds one end of the paper sheets 201, and a front cover 203, a back cover 204, and a spine cover 205 that are attached to the binding device 202 and protect the paper sheets 201 from the outside, and that can open and fold back the other end of the paper sheets 201 together with the front cover 203 and back cover 204 360 degrees around the binding device 202 as a fulcrum.

The binding device 202 also has a number of binding pieces 206a, 206b that are inserted into binding holes 201a formed on one end of the paper sheets 201. The binding pieces 206a, 206b are formed to protrude outward in the width direction from the side walls of left and right base parts 207a, 207b that extend in the longitudinal direction (the front-to-back direction of the drawing), and the tips of the binding pieces 206a, 206b are formed to be detachable by opening and closing the base parts 207a, 207b in the width direction.

Utility Model Registration No. 3132319 JP 2017-140785 A

However, the sketchbook 100 disclosed in Patent Document 1 has the following problems. In other words, in the sketchbook 100 of Patent Document 1, the drawing paper 103 is bound by annular binding rings 104 through which binding holes 102a are inserted, so it is not possible to select and bind only the required number of sheets of drawing paper 103. Therefore, for example, it is necessary to carry a heavy sketchbook 100 bound with drawing paper 103 that is not used for sketching, which is inconvenient.

In addition, because the drawing paper 103 is torn at the location where the break line 106 is formed, once removed, the drawing paper 103 cannot be bound again by the binding device 105. Therefore, for example, if you were not able to draw well in a previous sketch, but you feel it would be a shame to tear and throw away the drawing paper 103, you cannot remove it from the sketchbook 100 and bind it in another sketchbook 100 at home for storage.

In this regard, the file 200 disclosed in Patent Document 2 is formed so that the tips of the binding pieces 206a, 206b can be detached by opening and closing the base portions 207a, 207b in the width direction, so that only the required number of sheets 201 can be selected and bound to the binding device 202, and the sheets 201 that have been removed can also be bound to the binding device 202 again.

However, as shown in FIG. 32, when the other end of the paper sheet 201 is opened 360 degrees with the front cover 203 and back cover 204 at the binding device 202 as a fulcrum and folded back, one end of the front cover 203 and back cover 204 abuts against the side walls of the left and right base portions 207a, 207b, so a gap W equivalent to the width of the base portions 207a, 207b is created between the folded back paper sheets 201. Therefore, when attempting to write or draw on the paper sheet 201 folded back 360 degrees, the presence of the gap W makes the paper sheet 201 prone to bending, making it difficult to write letters, pictures, etc.

The gap W is formed in a wedge shape with one end of the front cover 203 and the back cover 204 abutting the side walls of the left and right base parts 207a and 207b, and the other end abutting each other. Therefore, even if the thickness of the front cover 203 and the back cover 204 is increased, or even if a general thin plate-like underlay member is inserted between the sheets 201, it is impossible to avoid a state in which the amount of bending of the sheets 201 is likely to be maximized near the center of the width of the sheets 201. Therefore, the amount of bending of the sheets 201 changes depending on the location where it is written or drawn, and letters, pictures, etc. cannot be written accurately. In particular, in the case of paintings, etc., which are drawn while delicately controlling the bending of the brush, the change in the amount of bending of the sheets 201 depending on the location of drawing has a large impact on the quality of the painting, etc.

The present invention has been made to solve the above problems, and its purpose is to provide a spacer member and a spacer file set in which the spacer member is attached to a file, which closes the gaps between sheets of paper that are bound in a detachable binding device and opened approximately 360 degrees and folded back, allowing letters, pictures, etc. to be written on the sheets of paper easily and accurately.

In order to solve the above problems, a spacer member and a spacer file set according to the present invention have the following configuration.
(1) A spacer member that is formed so as to be attachable to a file that includes a binding device having a binding piece formed so as to be detachable at a tip portion, and paper sheets bound to the binding piece, and that can open and fold back the paper sheets approximately 360 degrees with the binding device as a fulcrum,
The spacer member includes a holding portion having a locking hole inserted through the binding piece and disposed adjacent to the paper sheets, and a plate-shaped space portion connected to the holding portion and disposed on the opposite side of the paper sheets before being opened approximately 360 degrees outside the binding device and folded back,
The space portion is formed to a size sufficient to close a gap between the paper sheets that have been opened approximately 360 degrees and folded back due to the binding device.

In the present invention, the spacer member includes a holding portion having a locking hole inserted through the binding piece and arranged adjacent to the paper sheets, and a plate-shaped space portion connected to the holding portion and arranged on the opposite side of the paper sheets before they are opened approximately 360 degrees outside the binding device and folded back. The space portion is formed to a size that closes the gaps caused by the binding device between the paper sheets that have been opened approximately 360 degrees and folded back, so that when the paper sheets are opened approximately 360 degrees around the binding device as a fulcrum, the space portion can be inserted into the area of the paper sheets that protrudes outward from the binding device (area for writing or drawing) to completely suppress bending of the paper sheets.

Therefore, according to the present invention, it is possible to provide a spacer member that can close the gaps between paper sheets that are opened approximately 360 degrees and folded back while bound with a detachable binder, and can easily and accurately write letters, pictures, etc. on the paper sheets.

(2) In the spacer member according to (1),
A front cover and a back cover are attached to the binder to protect the paper sheets from both the front and back sides,
The holding portion is formed to be approximately the same size as the paper sheet and is positioned on the back side of the front cover or the back cover, and the space portion is formed to be approximately the same size as the area of the paper sheet that is opened approximately 360 degrees and folded back and protrudes outward from the binding device and is positioned on the front side of the front cover or the back cover.

In the present invention, the binding device is fitted with a front cover and a back cover that protect the paper sheets from both the front and back sides, the retaining portion is formed to be approximately the same size as the paper sheets and is arranged on the back side of the front or back cover, and the space portion is formed to be approximately the same size as the area (area for writing or drawing) that protrudes outward from the binding device when the paper sheets are opened approximately 360 degrees and folded back and is arranged on the front side of the front or back cover, so that when the paper sheets are opened approximately 360 degrees together with the front and back covers and folded back, the space portion connected to the retaining portion is also folded back together, and the space portion is automatically inserted between the front cover and back cover that have been opened approximately 360 degrees and folded back. The space portion is formed to be approximately the same size as the area (area for writing or drawing) that protrudes outward from the binding of the paper sheet that has been opened approximately 360 degrees and folded back, so when writing or drawing on the paper sheet that has been folded back 360 degrees, the space portion does not protrude outward from the outer edge of the paper sheet, and the space portion can reliably close the gap between the paper sheets. As a result, the paper sheet that has been folded back 360 degrees is easy to grip and the entire paper sheet is less likely to bend, making it easier and more accurate to write letters, pictures, etc.

(3) In the spacer member according to (2),
The space portion is made of a core material and a film material that wraps the core material, and is integrally formed at the top and bottom in the longitudinal direction of the binding tool,
The present invention is characterized in that the upper end of the film material is connected to the upper end of the holding part at the position of the upper end of the front cover or the back cover, and the lower end of the film material is connected to the lower end of the holding part at the position of the lower end of the front cover or the back cover.

In the present invention, the space portion is composed of a core material and a film material that encases the core material, and is formed integrally from top to bottom in the longitudinal direction of the binding device, with the upper end of the film material connected to the upper end of the holding portion at the position of the upper end of the front cover or back cover, and the lower end of the film material connected to the lower end of the holding portion at the position of the lower end of the front cover or back cover, so that the upper and lower positions of the space portion can be regulated by the upper and lower ends of the front cover or back cover. Therefore, the space portion opens approximately 360 degrees and more accurately fills the gaps between folded paper sheets in the longitudinal direction of the binding device, making it easier and more accurate to write letters, pictures, etc. on the paper sheets.

(4) In the spacer member according to (3),
The upper end of the film material is folded over at the upper end of the front cover or the back cover and connected to the upper end of the holding part, and the lower end of the film material is folded over at the lower end of the front cover or the back cover and connected to the lower end of the holding part.

In the present invention, the upper end of the film material is folded back at the upper end of the front or back cover and connected to the upper end of the holding part, and the lower end of the film material is folded back at the lower end of the front or back cover and connected to the lower end of the holding part, so that the spacer part D can be connected to the holding part without protruding from the upper or lower end of the front or back cover. Therefore, the spacer member is not in the way and can be safely used to close the gaps between folded paper sheets that are opened approximately 360 degrees, making it easier and more accurate to write letters, pictures, etc. on the paper sheets.

(5) In the spacer member according to (3),
The present invention is characterized in that the upper end of the film material is connected to the upper end of the holding part which protrudes upward from the upper end of the front cover or the back cover, and the lower end of the film material is folded back at the lower end of the front cover or the back cover and connected to the lower end of the holding part.

In the present invention, the upper end of the film material is connected to the upper end of the holding part that protrudes upward from the upper end of the front cover or back cover, so the upper end of the film material and the upper end of the holding part can be easily connected by welding, sewing, or the like. Also, the lower end of the film material is folded back at the lower end of the front cover or back cover and connected to the lower end of the holding part, so the spacer part can be connected to the holding part without protruding from the lower end of the front cover or back cover. Therefore, while improving the workability of connecting the film material to the holding part, a safe state can be ensured without the spacer member getting in the way when grasping paper sheets that have been opened approximately 360 degrees and folded back.

(6) The spacer member according to (3),
The holding portion is formed integrally at the top and bottom in the longitudinal direction of the binding tool, and the locking hole is formed in an elongated hole shape in the width direction of the binding tool.

In the present invention, the holding portion is integrally formed on the top and bottom in the longitudinal direction of the binding device (the direction of the arrow N), and the locking hole is formed in a long hole shape in the width direction of the binding device 2 (the direction of the arrow H). Therefore, the long hole-shaped locking hole can be inserted or removed with a margin into or from the tip of each open binding piece, and the spacer member can be easily attached to or removed from the file. This further improves the attachability and detachability of the spacer member to the file. As a result, the spacer member can be easily attached to the file as needed, and letters, pictures, etc. can be written on paper sheets more easily and accurately. In addition, since the attached spacer member can be easily removed from the file, a decrease in storage efficiency when storing files in a bookshelf, etc. can be avoided.

(7) In the spacer member according to (6),
A pair of support pieces are formed at the upper and lower parts of the holding part so as to protrude inward in the width direction of the binding tool, and the locking holes are formed in the support pieces, respectively.
The inner end portion in the width direction of the holding portion is formed widthwise outward of the inner end portion in the width direction of the space portion in an area other than the two support pieces.

In the present invention, a pair of support pieces are formed at the upper and lower parts of the holding part, protruding inward in the width direction of the binding tool, and a locking hole is formed in each of the support pieces, so that even if the binding pieces are formed only at the upper and lower parts of the binding tool in the longitudinal direction (direction of arrow N), the spacer member can be attached to the file. In addition, the inner end of the holding part in the width direction is formed outward in the width direction from the inner end of the space part in the width direction in the area other than the two support pieces, so that even if the binding pieces are formed continuously from the upper part to the lower part in the longitudinal direction of the binding tool, the holding part does not interfere with the binding pieces and the spacer member can be attached to the file. Therefore, regardless of the type of binding tool, the attachability and detachability of the spacer member to various files can be ensured. As a result, the spacer member can be easily attached to various files as needed, and letters, pictures, etc. can be written on paper sheets more easily and accurately. In addition, since the attached spacer member can be easily removed from various files, it is possible to avoid a decrease in storage efficiency when storing the files in a bookshelf, etc.

(8) The spacer member according to any one of (3) to (5),
The holding portion is divided into two upper and lower holding pieces in the longitudinal direction of the binding device, and the upper holding piece located at the top and the lower holding piece located at the bottom are each formed with the locking hole, and the locking hole is larger than the binding hole that binds the paper sheets to the binding piece.

In the present invention, the holding portion is divided into two holding pieces, upper and lower, in the longitudinal direction of the binding device (the direction of the arrow N), and the upper holding piece located at the top and the lower holding piece located at the bottom are each formed with a locking hole, which is larger than the binding hole for binding the paper sheets, so that the locking hole of the upper holding piece and the locking hole of the lower holding piece can be inserted or removed with a margin into or from the tip of each open binding piece, and the spacer member can be easily attached or removed from the file. Therefore, the attachability and detachability of the spacer member to the file can be further improved. As a result, the spacer member can be easily attached to the file as needed, and letters, pictures, etc. can be written on the paper sheets more easily and accurately. In addition, since the attached spacer member can be easily removed from the file, a decrease in storage efficiency when storing the file in a bookshelf, etc. can be avoided.

(9) The spacer member according to (8),
The dividing line between the upper holding piece and the lower holding piece is formed in a wavy shape that curves up and down.

In the present invention, the parting line between the upper and lower holding pieces is formed in a wavy shape that curves up and down, so that the parting line is less likely to cause dents in the paper sheet. In addition, because the parting line between the upper and lower holding pieces is curved in a wavy shape that curves up and down, it is less likely that the space portion will bend. Therefore, it is easier and more accurate to write letters, pictures, etc. on paper sheets that are opened approximately 360 degrees and folded back.

(10) In the spacer member according to (2),
The space portion is composed of a core material and a film material that wraps the core material, and is characterized in that the widthwise outer end portion of the film material is connected to the widthwise outer end portion of the holding portion so as to be bent in the width direction of the binding device.

In the present invention, the spacer is made of a core material and a film material that encases the core material, and the outer end of the film material is connected to the outer end of the holding part in a manner that allows it to be folded in the width direction of the binding device (the direction of the arrow H). Therefore, the connecting part between the spacer and the holding part is formed in a straight line along the longitudinal direction of the binding device (the direction of the arrow N), the holding part is placed on the back side of the front cover or back cover, and the outer end of the film material in the width direction is folded back to place the spacer on the front side of the front cover or back cover. In this case, the spacer can be connected to the holding part without protruding from the upper and lower ends of the front cover or back cover. Therefore, the spacer member can be opened approximately 360 degrees and folded back to close the gap between the folded paper sheets in a safe state without getting in the way, making it easier and more accurate to write letters, pictures, etc. on the paper sheets.

(11) The spacer member according to any one of (3) to (10),
The core material is characterized in that it is made of a resin foam sheet or a resin cardboard sheet having a required thickness.

In the present invention, the core material is made of a resin foam sheet or a resin cardboard sheet having the required thickness, so that the necessary rigidity for the space can be secured while weight can be reduced. In addition, the resin foam sheet or the resin cardboard sheet has a certain degree of elasticity, so that letters, pictures, etc. can be written on the paper sheets more easily. Note that the resin foam sheet is preferably a low-density foam sheet with an expansion ratio of about 8 to 10 times. In addition, the resin cardboard sheet is excellent in terms of strength and durability, and is suitable for sketchbooks and the like with a large flat surface size.

(12) A spacer file set having the spacer member according to any one of (1) to (11) attached thereto,
The binding device includes:
Left and right connecting portions that connect the base ends of the binding pieces at appropriate intervals in the longitudinal direction;
A plurality of bearing portions formed alternately in the longitudinal direction on the left and right connecting portions;
A rotation center shaft that is inserted through each of the bearing portions and extends in the longitudinal direction;
A spring member attached between the left and right connecting portions,
A spine connected to the front cover and the back cover is fixed to the rear side of the connecting portion on either the left or right side,
When the engagement between the tip ends of the binding pieces is released, the connecting portion to which the spine is fixed and the connecting portion to which the spine is not fixed are formed so as to be rotatable by the biasing force of the spring member to a state in which the opening angle between them with respect to the rotation center axis is approximately 80 to 100 degrees.

In the present invention, the binding device is provided with left and right connecting parts that connect the base ends of the binding pieces at appropriate intervals in the longitudinal direction (the direction of the arrow N), a plurality of bearing parts formed alternately in the longitudinal direction in the left and right connecting parts, a rotation center shaft inserted into each bearing part and extending in the longitudinal direction, and a spring member attached between the left and right connecting parts, and a spine cover connected to the front and back covers is fixed to the back side of either the left or right connecting part, and when the engagement between the tip ends of the binding pieces is released, the one connecting part to which the spine cover is fixed and the other connecting part to which the spine is not fixed are formed so that they can rotate with respect to the rotation center axis to an opening angle of approximately 80 to 100 degrees due to the biasing force of the spring member. For example, when the front cover and back cover are opened approximately 180 degrees with the spine facing downward or diagonally downward, and the engagement between the tip ends of the left and right binding pieces is released, the other connecting part is not easily affected by the spine connected to the front and back covers, and so rotates approximately 80 to 100 degrees mainly under the influence of the biasing force of the spring member. Therefore, the locking hole of the holding part in the spacer member can be easily inserted into or removed from the tip end of the other binding piece connected to the other connecting part.

Therefore, the spacer member can be easily attached to or detached from the binding device of the spacer file set. As a result, the spacer member can be easily attached to the binding device of the spacer file set as needed, making it easier and more accurate to write letters, pictures, etc. on paper sheets. In addition, since the attached spacer member can be easily removed from the binding device of the spacer file set, only the files from which the spacer member has been removed can be effectively stored on a bookshelf, etc.

(13) In the spacer file set according to (12),
the spring member is a compression torsion coil spring that is compressed in the longitudinal direction and mounted between the bearing portions that are alternately arranged in the longitudinal direction, and that is wound in a spiral shape around the outer circumferential side of the rotation central shaft,
The present invention is characterized in that one end edge arm portion of the compression torsion coil spring urges one of the connecting portions to which the spine is fixed toward the rear side, and the other end edge arm portion of the compression torsion coil spring urges the other connecting portion to which the spine is not fixed, toward the outward width direction.

In the present invention, the spring member is a compression torsion coil spring that is compressed in the longitudinal direction and mounted between bearing parts that are arranged alternately in the longitudinal direction (the direction of arrow N) and is spirally wound around the outer periphery of the rotation center shaft. One end edge arm of the compression torsion coil spring urges one connecting part to which the spine is fixed toward the back side, and the other end edge arm of the compression torsion coil spring urges the other connecting part to which the spine is not fixed outward in the width direction. Therefore, when the front and back covers are opened approximately 180 degrees and the engagement between the tips of the left and right binding pieces is released, most of the torsional urging force of the compression torsion coil spring acts as a moment force that rotates the other connecting part to which the spine is not fixed outward in the width direction.

The tip of the other binding piece connected to the other connecting part is therefore held in a stable position by the biasing force of the compression torsion coil spring in the torsional direction. This makes it even easier to insert or remove the locking hole in the holding part of the spacer member from the tip of the binding piece held in a stable position. As a result, the gap between the front and back covers that are opened approximately 360 degrees and folded back can be filled more easily with the spacer, making it easier and more accurate to write letters, pictures, etc. on the paper sheets.

(14) In the spacer file set according to (13),
A cam surface is provided on each of the longitudinal end faces of the adjacent bearing portions, the cam surface being inclined with respect to the rotation central axis,
The cam surfaces are formed so as to be spaced apart from each other when the tip ends of the left and right binding pieces are in an engaged state, and to be in contact with each other when the tip ends of the left and right binding pieces are in a released state.

In the present invention, the longitudinal end faces of adjacent bearing parts are each provided with a cam surface formed at an angle with respect to the central axis of rotation, and the cam surfaces are formed so as to separate from each other when the leading ends of the left and right binding pieces are in an engaged state and to abut each other when in a released state. Therefore, when the leading ends of the left and right binding pieces are released from engagement, the cam surfaces abut each other and the biasing force of the compression torsion coil spring to expand in the longitudinal direction is transmitted to the bearing part on which the cam surface is formed. Therefore, the force of the compression torsion coil spring to expand in the longitudinal direction is transmitted to the bearing part, and the force of the compression torsion coil spring to expand in the longitudinal direction is increased by the force of the bearing part to which the biasing force is transmitted.

Therefore, the opening angle between the left and right connecting parts can be maintained at its maximum. As a result, when the locking holes of the holding parts of the spacer member are inserted into or removed from the ends of the binding pieces, the separation state between the ends of the binding pieces can be maintained more reliably, and the possibility of the locking holes of the holding parts of the spacer member getting caught on the ends of the binding pieces can be further reduced. Note that a compression coil spring can be used here instead of the compression torsion coil spring.

(15) In the spacer file set according to (14),
The bearing portion having the cam surface is provided at least near an end portion in the longitudinal direction of the connecting portion.

In the present invention, the bearing portion with the cam surface is provided at least near the longitudinal end of the connecting portion, so that when the engagement of the tip ends of the left and right binding pieces is released, the biasing force of the compressed torsion coil spring that expands in the longitudinal direction acts on the cam surface, and the opening angle of the connecting portion near the longitudinal end of the binding device can be maintained at its maximum. Therefore, even in files with a large longitudinal length of the binding device (such as large sketchbooks), the tip ends of the binding pieces can be more reliably maintained apart, and the possibility of the locking hole of the holding portion of the spacer member getting caught on the tip of the binding piece can be further reduced.

In addition, the opening angle of the connecting portion near the longitudinal end of the binding device can be maintained at its maximum, which complements the torsional rigidity of the connecting portion in the longitudinal direction. This allows, for example, the compression torsion coil spring to be made more compact, making the thickness (width dimension) of the connecting portion as thin as possible. Therefore, when the other end of the paper sheet is opened 360 degrees with the front and back covers around the binding device as a fulcrum and folded back, the gap between the front and back covers caused by the connecting portion at one end of the paper sheet can be reduced, and the thickness of the space portion in the spacer member can be made thin. As a result, an even more compact spacer file set can be provided.

(16) In the spacer file set according to any one of (12) to (15),
The base end portions of the left and right binding pieces are formed to be offset from each other in the longitudinal direction by a dimension equal to or greater than the plate width in the longitudinal direction,
The left and right binding pieces are characterized in that the tip ends thereof are formed with engaging portions which protrude inward in the width direction by a predetermined length from the tip side of the base end portion and which engage with each other at an inclined portion which is inclined in the longitudinal direction from the position protruding inward in the width direction.

In the present invention, the base ends of the left and right binding pieces are formed with a dimension equal to or greater than the board width in the longitudinal direction and offset from each other in the longitudinal direction (direction of arrow N), and the tip ends of the left and right binding pieces are formed with engaging portions that protrude inward in the width direction by a predetermined length from the tip side of the base ends and engage with each other at inclined portions that are inclined in the longitudinal direction from the position where they protrude inward in the width direction. Therefore, when multiple spacer file sets are stacked and stored in a bookshelf, etc., interference between the binding devices of adjacent spacer file sets can be avoided, and the number of files that can be stored in a bookshelf, etc. can be increased.

(17) In the spacer file set according to any one of (12) to (16),
The left and right binding pieces face each other and are formed into a substantially U-shaped cross section with different depths of the bottom relative to the tip,
The locking hole of the holding portion is characterized in that the binding piece having a deep bottom portion is inserted into the locking hole of the holding portion.

In the present invention, the left and right binding pieces face each other and are formed with a roughly U-shaped cross section with different bottom depths relative to the tip, and the locking hole of the holding part is inserted into the binding piece with the deeper bottom depth, so the number of sheets of paper to be bound by the binding device can be increased without the spacer protruding outward from the bottom of the binding piece. Therefore, even if the number of sheets of paper to be bound by the binding device is increased, the spacer does not get in the way and the spacer file set can be easily carried.

(18) In the spacer file set according to any one of (12) to (17),
The rotation center axis is characterized in that it is positioned at a position offset by a predetermined amount toward the other connecting part to which the spine is not fixed, relative to the widthwise center line of one of the connecting parts to which the spine is fixed.

In the present invention, the rotation center axis is positioned at a position offset by a predetermined amount from the widthwise centerline of one connecting part to which the spine is fixed toward the other connecting part to which the spine is not fixed, so that stopper parts that release the engagement between the tips of the left and right binding pieces and hold the opening angle of the left and right connecting parts at a maximum can be formed on the widthwise side of one connecting part and on the back side of the other connecting part. Therefore, the stopper parts can be provided at suitable positions in the longitudinal direction while ensuring the necessary widthwise thickness of one connecting part and the other connecting part.

In addition, by providing a stopper portion at a suitable position in the longitudinal direction, the opening angle between the left and right connecting portions can be maintained approximately equal in the longitudinal direction. As a result, when the engagement between the leading ends of the left and right binding pieces is released and the locking hole of the holding portion in the spacer member is removed from the binding pieces or inserted into the binding pieces, the separation distance between the leading ends of the binding pieces in the entire longitudinal direction can be maintained approximately equal, further reducing the possibility that the locking hole of the holding portion will get caught on the leading end of the binding piece.

(19) In the spacer file set according to any one of (12) to (18),
A plurality of claw-shaped engaging portions are formed on the back side of one of the connecting portions, the claw portions being each formed wider than a base portion and projecting from a tip of the base portion toward the longitudinal center portion,
The spine is characterized in that a spine locking hole having a large diameter portion through which the claw portion passes and a small diameter portion which is engaged with the base portion and clamped by the claw portion is formed.

In the present invention, the back side of one of the connecting parts is formed with a base part that stands symmetrically with respect to the longitudinal center part, and a claw part that is wider than the base part, and the claw parts are each formed with a plurality of claw-shaped engagement parts that protrude from the tip of the base towards the longitudinal center part, and the spine is formed with spine engagement holes in the shape of long holes of different diameters through which the claw parts pass at the large diameter part and are sandwiched by the claw parts while engaging with the base at the small diameter part. Therefore, with the spine in a state where the longitudinal center part is curved in a mountain shape, the claw parts pass through the large diameter part of the spine engagement hole, and then the longitudinal center part of the spine is returned to a flat state, and with the base engaged with the small diameter part of the spine engagement hole, the small diameter part of the spine engagement hole can be sandwiched and restrained by the claw parts.

Therefore, the spine 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 to one of the connecting parts to fix the spine. Therefore, by simplifying the structure of one of the connecting parts that fixes the spine, when the other end of the paper sheet is opened approximately 360 degrees with the front and back covers around the binder as a fulcrum and folded back, the gap between the front and back covers at one end of the paper sheet due to the connecting part can be minimized, and the thickness of the space in the spacer member can be minimized. As a result, the spacer file set can be easily carried without the space getting in the way.

(20) In the spacer file set according to (19),
A label sheet is attached to the spine at the longitudinal center avoiding the claw-shaped engagement portion and the binding piece, and the label sheet extends to the front cover and the back cover without being hidden by the space portion.

In the present invention, a label sheet is attached to the spine in the longitudinal center, avoiding the hook-shaped locking portion and binding strip, and the label sheet extends to the front and back covers to the extent that it is not hidden by the space, so that the name of the spacer file set, etc. can be written on the label sheet, improving the identifiability and searchability of the spacer file set.

(21) In the spacer file set according to any one of (12) to (20),
When the paper sheets, etc. are normally bound in the binding device, a portion of the tip of the other end of the front cover or back cover that is not sandwiched between the retaining portion and the space portion is formed longer than the tip of the other end of the back cover or front cover that is sandwiched between the retaining portion and the space portion, and when the other end of the paper sheets is opened approximately 360 degrees together with the front cover and back cover and folded back with the binding device as a fulcrum, the tip of the other end of the back cover or front cover is shortened relative to the tip of the other end of the paper sheets, and a portion of the tip of the other end of the front cover or back cover slightly protrudes.

In the present invention, when the paper sheets 1 etc. are normally bound to the binding device 2 (before being folded back approximately 360 degrees), a portion (e.g., an upper portion) of the tip of the other end of the front or back cover that is not sandwiched between the retaining portion and the space portion is formed longer than the tip of the other end of the back cover or front cover that is sandwiched between the retaining portion and the space portion, and when the other end of the paper sheets is opened approximately 360 degrees together with the front and back covers and folded back with the binding device as the fulcrum, the tip of the other end of the back cover or front cover is shortened relative to the tip of the other end of the paper sheets, and a portion of the tip of the other end of the front or back cover protrudes slightly. Therefore, when returning the other end of the paper sheets from the state in which it has been opened approximately 360 degrees together with the front and back covers and folded back to the state before it was folded back approximately 360 degrees, a finger can be hooked on the protruding portion of the tip of the other end of the front or back cover, and it can be easily returned to the state before it was folded back approximately 360 degrees. This improves operability when returning to the state before folding approximately 360 degrees.

The present invention provides a spacer member that closes the gaps between paper sheets that are opened approximately 360 degrees and folded back while bound with a detachable binder, and allows easy and accurate writing of letters, pictures, etc. on the paper sheets, and a spacer file set in which the spacer member is attached to a file.

FIG. 2 is a front view of a spacer file set to which a spacer member according to a first embodiment of the present invention is attached, as viewed from the back cover side. 2 is a development view of the spacer file set shown in FIG. 1 in a state where the back cover to which the spacer member of the first embodiment is attached is opened approximately 180 degrees with the binder as a fulcrum. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 4 is a view taken along the arrow B shown in FIG. 3 . 5 is a cross-sectional view taken along the line CC shown in FIG. 4. 2 is a cross-sectional view of the essential parts of the spacer file set 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. 2 is a cross-sectional view of the spacer file set shown in FIG. 1 in a state where the paper sheets, together with the front and back covers, are opened approximately 360 degrees around the binder as a fulcrum and then folded back. FIG. 8 is an enlarged cross-sectional view of part C shown in FIG. 7 . FIG. 3 is a front view of the spacer member of the first embodiment shown in FIG. 2 . 10 is a development view of the spacer member of the first embodiment shown in FIG. 9 in a state where the upper holding piece is opened approximately 180 degrees upward with the upper end of the space portion as a fulcrum. 11 is a cross-sectional view taken along the line D-D in FIG. 10 is a cross-sectional view taken along the line DD of a first modified example in which the core material of the spacer member of the first embodiment shown in FIG. 9 is changed. FIG. 10 is a front view of a second modified example in which a holding portion in the spacer member of the first embodiment shown in FIG. 9 is changed. FIG. 10 is a front view of a third modified example in which the holding portion of the spacer member of the first embodiment shown in FIG. 9 is changed. 15 is a cross-sectional view taken along the line E-E shown in FIG. 14. FIG. 10 is a front view of a fourth modified example in which the holding portion of the spacer member of the first embodiment shown in FIG. 9 is changed. 17 is a cross-sectional view taken along the line FF shown in FIG. 16. FIG. 11 is a front view of a spacer file set to which a spacer member according to a second embodiment of the present invention is attached, as viewed from the back cover side. FIG. 19 is a development view of the spacer file set shown in FIG. 18 in a state where the back cover to which the spacer member of the second embodiment is attached is opened approximately 180 degrees with the binder as a fulcrum. This is a cross-sectional view taken along line GG shown in Figure 18. This is a cross-sectional view taken along the line HH shown in FIG. FIG. 20 is a front view of the spacer member of the second embodiment shown in FIG. 19 . FIG. 17 is a front view of a fifth modified example in which the holding portion of the spacer member of the fourth modified example shown in FIG. 16 is changed. 8 is an enlarged cross-sectional view of the binder in part C shown in FIG. 7 . FIG. 25 is a partial front view taken along line I in FIG. 24 . 25 is a front view of the binding device shown in FIG. 24 when the engagement between the tip ends of the left and right binding pieces is released. FIG. FIG. 27 is a partial perspective view of the binding device shown in FIG. 26 . 27A and 27B are detailed views of part F shown in FIG. 26, in which (A) shows a front view when the tip ends of the left and right binding pieces are disengaged from each other, and (B) shows a front view when the tip ends of the left and right binding pieces are engaged with each other. FIG. 27 is an exploded perspective view of the binding device shown in FIG. 26 . This is an exploded view of the sketchbook described in Patent Document 1, with the drawing paper opened approximately 180 degrees around the binder as a fulcrum. This is a partially enlarged view showing the state in which the drawing paper is torn at the location where the break line is formed in the sketchbook shown in Figure 30. 1 is a cross-sectional view of the file described in Patent Document 2 in a state where the other end side of the paper sheets, together with the front and back covers, are opened 360 degrees around the binder as a fulcrum and then folded back.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, a first embodiment of the spacer member according to the present embodiment, its first to fourth modifications, and a second embodiment will be described in detail. Next, a spacer file set, which is another embodiment in which the spacer member according to the present embodiment is attached, will be described in detail.

<Spacer Member of First Embodiment and First to Fourth Modifications thereof>
First, the spacer member of the first embodiment according to the present invention and its first to fourth modified examples will be described in detail with reference to FIGS. 1 to 3 and 6 to 17. FIG. 1 shows a front view of a spacer file set to which a spacer member according to the first embodiment of the present invention is attached, as seen from the back cover side. FIG. 2 shows a development view of the spacer file set shown in FIG. 1 in a state in which the back cover to which the spacer member of the first embodiment is attached is opened approximately 180 degrees with the binding device as a fulcrum. FIG. 3 shows a cross-sectional view taken along the line A-A in FIG. 1. FIG. 6 shows a cross-sectional view of the main parts of the spacer file set shown in FIG. 1 when the front cover and back cover are opened approximately 180 degrees and the engagement of the leading ends of the left and right binding pieces is released. FIG. 7 shows a cross-sectional view of the spacer file set shown in FIG. 1 in a state in which the paper sheets are opened approximately 360 degrees together with the front cover and back cover and folded back with the binding device as a fulcrum. FIG. 8 shows an enlarged cross-sectional view of the C part shown in FIG. 7. FIG. 9 shows a front view of the spacer member of the first embodiment shown in FIG. 2. FIG. 10 shows a development view of the upper holding piece of the spacer member of the first embodiment shown in FIG. 9 in a state where it is opened approximately 180 degrees upward with the upper end of the spacer portion as a fulcrum. FIG. 11 shows a D-D cross section shown in FIG. 10. FIG. 12 shows a D-D cross section of a first modified example in which the core material of the spacer member of the first embodiment shown in FIG. 9 is changed. FIG. 13 shows a front view of a second modified example in which the holding portion of the spacer member of the first embodiment shown in FIG. 9 is changed. FIG. 14 shows a front view of a third modified example in which the holding portion of the spacer member of the first embodiment shown in FIG. 9 is changed. FIG. 15 shows an E-E cross section shown in FIG. 14. FIG. 16 shows a front view of a fourth modified example in which the holding portion of the spacer member of the first embodiment shown in FIG. 9 is changed. FIG. 17 shows an F-F cross section shown in FIG. 16.

As shown in Figures 1 to 3 and Figures 6 to 17, the spacer member 4 (4A) according to the first embodiment of this invention and its first to fourth modified examples 4 (4B, 4C, 4D, 4E) are spacer members 4 formed so as to be attachable to a file 10 that includes a binding device 2 having a binding piece 2T whose tip portion 2ST is formed so as to be detachable, and paper sheets 1 bound to the binding piece 2T, and that can open and fold the paper sheets 1 approximately 360 degrees with the binding device 2 as a fulcrum.

The paper sheets 1 are, for example, various notebook size papers such as A4, B5, etc. (JIS standard) or drawing paper for a sketchbook, and a plurality of (for example, 10) binding holes 11 are formed on one end side of the paper sheets 1 through which the binding pieces 2T of the binding device 2 are inserted. The binding pieces 2T of the binding device 2 are formed so that the tip portions 2ST (2STa, 2STb) can be engaged and separated. In addition, the base ends 2LT (2LTa, 2LTb) of each binding piece 2T (2Ta, 2Tb) are connected at appropriate intervals to left and right connecting portions 21 (21a, 21b) extended in the longitudinal direction (direction of arrow N). Here, the longitudinal length of the connecting portions 21 (21a, 21b) of the binding device 2 is formed shorter than the longitudinal length of the paper sheets 1, but it may be approximately the same as the longitudinal length of the paper sheets 1.

The binding device 2 is fitted with a front cover 31 and a back cover 32 that protect the paper sheet 1 from both the front and back sides, but the front cover 31 or the back cover 32 does not necessarily have to be fitted. Also, the binding device 2 is fitted with a mount 1D between the paper sheet 1 and the front cover 31 and back cover 32, but the mount 1D does not necessarily have to be fitted. The spacer member 4G when the front cover 31 or back cover 32 is not fitted will be described later.

The front cover 31 and back cover 32 are connected to the spine 33 fixed to the rear side of one of the connecting parts 21a by an integral hinge, and are formed so as to be foldable. It is preferable that the integral hinge is formed at a position where it abuts both corners in the width direction on the rear side of one of the connecting parts 21a to which the spine 33 is fixed. In addition, the front cover 31 and back cover 32 are formed with irregular escape holes 311, 321 that avoid interference with the binding piece 2T of the binding device 2 when the front cover 31 and back cover 32 are closed.

When the front cover 31 and back cover 32 are opened 360 degrees around the binding device 2 as a fulcrum and folded back, the escape holes 311, 321 detach from the binding piece 2T of the binding device 2. The escape holes 311, 321 of the front cover 31 and back cover 32 are formed in a horizontally elongated, approximately elliptical shape in the width direction (opening direction), and preferably have a slight key-shaped bend at the tip in the width direction to avoid interference with the binding piece 2T. The detailed structure of the binding piece 2T will be described in detail in the spacer file set, which is another embodiment.

In addition, the spacer member 4 (4A) of the first embodiment and its first to fourth modified examples 4 (4B, 4C, 4D, 4E) are provided with holding portions 41, 41D, 41E having an engagement hole 411 inserted through the binding piece 2T and arranged adjacent to the paper sheet 1, and plate-shaped space portions 42, 42D, 42E connected to the holding portions 41, 41D, 41E and arranged on the opposite side of the paper sheet 1 before it is opened approximately 360 degrees outside the binding device 2 and folded back, and the space portions 42, 42D, 42E are formed to a size sufficient to close the gap W created by the binding device 2 between the paper sheets 1 that have been opened approximately 360 degrees and folded back. Therefore, when the paper sheet 1 is opened approximately 360 degrees and folded back with the binding device 2 as a fulcrum, the spaces 42, 42D, and 42E can be inserted into the area of the paper sheet 1 that protrudes outward from the binding device 2 (area for writing or drawing), thereby completely suppressing the bending of the paper sheet 1.

Therefore, according to the spacer members 4 (4A, 4B, 4C, 4D, 4E) of this embodiment, it is possible to provide a spacer member 4 that closes the gaps W between the sheets 1 that are opened approximately 360 degrees and folded back while the sheets 1 are bound by the detachable binding device 2, and allows characters, pictures, etc. to be written easily and accurately on the sheets 1. Even when the sheets 1 that are opened approximately 360 degrees and folded back are simply held with one hand, the spacer members 4 (4A, 4B, 4C, 4D, 4E) completely suppress the bending of the sheets 1, so that the characters, etc. written on the sheets 1 can be easily read.

The binding device 2 is also fitted with a front cover 31 and a back cover 32 that protect the paper sheet 1 from both sides, and the holding sections 41, 41D, and 41E are formed to be approximately the same size as the paper sheet 1 and are arranged on the back side of the front cover 31 or back cover 32, while the space sections 42, 42D, and 42E are formed to be approximately the same size as the area (area for writing or drawing) of the paper sheet 1 that protrudes outward from the binding device 2 when opened approximately 360 degrees and folded back, and are arranged on the front side of the front cover 31 or back cover 32. The space sections 42, 42D, and 42E are also formed approximately uniformly with a thickness t3 that corresponds to the distance between one end of the front cover 31 and the back cover 32 when opened approximately 360 degrees and folded back.

Therefore, when the paper sheets 1 bound by the binding device 2 are opened and folded back together with the front cover 31 and back cover 32 by approximately 360 degrees, with the binding device 2 as a fulcrum, the spacer portions 42, 42D, 42E connected to the holding portions 41, 41D, 41E are also folded back together, and the spacer portions 42, 42D, 42E are automatically inserted between the front cover 31 and back cover 32 that have been opened and folded back by approximately 360 degrees.

The space portions 42, 42D, 42E are formed to be approximately the same size as the area (area for writing or drawing) protruding outward from the binding device 2 of the paper sheet 1 that has been opened approximately 360 degrees and folded back, so that when writing or drawing is performed on the paper sheet 1 that has been folded back 360 degrees, the space portions 42, 42D, 42E do not protrude outward from the outer edge of the paper sheet 1, and the gaps W between the paper sheets 1 can be reliably filled by the space portions 42, 42D, 42E. As a result, the paper sheet 1 that has been folded back 360 degrees is easy to grip, the entire paper sheet 1 is less likely to bend, and letters, pictures, etc. can be written more easily and accurately.

Here, the retaining portions 41, 41D, and 41E are disposed on the back side of the back cover 32, and the space portions 42, 42D, and 42E are disposed on the front side of the back cover 32. The multiple locking holes 411 formed on one end side of the retaining portions 41, 41D, and 41E are locked to the multiple binding pieces 2T. Therefore, the spacer members 4 (4A, 4B, 4C, 4D, and 4E) of this embodiment are attached to the binding pieces 2T so that the space portions 42, 42D, and 42E and the retaining portions 41, 41D, and 41E sandwich the back cover 32 from both the front and back sides. Therefore, the spacer members 4 (4A, 4B, 4C, 4D, and 4E) can be easily carried together with the file 10.

The spacer members 4 (4A, 4B, 4C, 4D, 4E) of this embodiment may be attached to the binding piece 2T so that the spacers 42, 42D, 42E and the retaining parts 41, 41D, 41E sandwich the front cover 31 from both sides. Also, the binding piece 2T may be equipped with a spacer member 4 that sandwiches the back cover 32 from both sides, and a spacer member 4 that sandwiches the front cover 31 from both sides.

1, 2, and 9 to 17, in the spacer member 4 (4A) of the first embodiment and its first to fourth modified examples 4 (4B, 4C, 4D, 4E), the spacer portions 42, 42D, 42E are made of a core material 421 and film materials 43, 43D, 43E that wrap the core material 421, and are integrally formed vertically in the longitudinal direction of the binding device 2. Furthermore, the upper ends 432, 432D, 432E of the film materials 43, 43D, 43E are connected to the upper ends 412, 412D, 412E of the retaining portions 41, 41D, 41E at the positions of the upper ends 31J, 32J of the front cover 31 or the back cover 32. The lower ends 433, 433D, 433E of the film material 43, 43D, 43E are connected to the lower ends 414, 414D, 414E of the holding parts 41, 41D, 41E at the positions of the lower ends 31K, 32K of the front cover 31 or the back cover 32.

The vertical positions of the spaces 42, 42D, and 42E can therefore be regulated by the upper ends 31J, 32J and lower ends 31K, 32K of the front cover 31 or back cover 32. As a result, the spaces 42, 42D, and 42E open approximately 360 degrees and more accurately close the gaps W between the folded sheets 1 in the longitudinal direction of the binder 2, making it easier and more accurate to write letters, pictures, and the like on the sheets 1.

As shown in Figures 11, 15, and 17, in the spacer member 4 (4A) of the first embodiment and its first, third, and fourth modified examples 4 (4C, 4D, and 4E), the core material 421 is formed of a resin foam sheet 421A having the required thickness, and as shown in Figure 12, in the spacer member 4 (4B) of the second modified example, the core material 421 is formed of a resin cardboard sheet 421B having the required thickness.

The core material 421 is made of a resin foam sheet 421A or a resin cardboard sheet 421B having a required thickness, so that the weight can be reduced while ensuring the necessary rigidity for the space portion 42. In addition, the resin foam sheet 421A or the resin cardboard sheet 421B has a certain degree of elasticity, so that letters, pictures, etc. can be written on the paper sheet 1 more easily. The resin foam sheet 421A is preferably a low-density foam sheet with a foaming ratio of about 8 to 10 times. In the spacer member 4 (4D) of the third modified example, the core material 421 is formed of a plurality of resin foam sheets 421A (421A1, 421A2) having different thicknesses. In this case, the foaming ratio of each foam sheet 421A (421A1, 421A2) can be changed according to the writing pressure of the letters, pictures, etc.

As shown in Fig. 12, the resin cardboard sheet 421B is composed of a front plane plate 421a, a back plane plate 421a, and vertical plates 421b that connect the two at a specified pitch, so it is strong and durable, and is suitable for sketchbooks and the like with large planar sizes. Note that the vertical plate 421b shown in Fig. 12 extends in the width direction of the paper sheet 1 (in the direction of the arrow H), but it may also extend in the longitudinal direction of the binder 2 (in the direction of the arrow N).

The film materials 43, 43D, and 43E are formed of, for example, a resin film such as polyester, polyethylene, or polypropylene, or a cloth film. The holding portions 41, 41D, and 41E are formed of, for example, a resin sheet such as polyester or polyethylene. If the film materials 43, 43D, and 43E are resin films, they are preferably connected to the holding portions 41, 41D, and 41E by welding or sewing. If the film materials 43, 43D, and 43E are cloth films, they are preferably connected to the holding portions 41, 41D, and 41E by sewing. In addition, a fastener or clip may be provided on the film materials 43, 43D, and 43E to detachably connect the space portion 42 and the holding portion 41.

As shown in Figs. 1, 2, 9 to 15, in the spacer member 4 (4A) of the first embodiment and its first to third modified examples 4 (4B, 4C, 4D), the upper end 432, 432D of the film material 43, 43D is folded back at the upper end 31J, 32J of the front cover 31 or the back cover 32 and connected to the upper end 412, 412D of the holding portion 41, 41D. The lower end 433, 433D of the film material 43, 43D is folded back at the lower end 31K, 32K of the front cover 31 or the back cover 32 and connected to the lower end 414, 414D of the holding portion 41, 41D. The film material 43 (431) is formed to enclose the entire surface of the core material 421 and the vicinity of the outer periphery of the back surface of the core material 421, and is joined with an adhesive.

In this case, the spacer portions 42, 42D can be connected to the holding portions 41, 41D without protruding from the upper ends 31J, 32J and lower ends 31K, 32K of the front cover 31 or back cover 32. Therefore, the spacer members 4, 4D can close the gaps W between the paper sheets 1 that have been opened approximately 360 degrees and folded back in a safe state without getting in the way, making it easier and more accurate to write letters, pictures, etc. on the paper sheets 1.

As shown in Figures 16 and 17, in the spacer member 4 (4E) of the fourth modified example, the upper end 432E of the film material 43E is connected to the upper end 412E of the holding portion 41E that protrudes upward from the upper end 31J, 32J of the front cover 31 or the back cover 32. Therefore, the upper end 432E of the film material 43E and the upper end 412E of the holding portion 41E can be easily connected by welding, sewing, etc.

The lower end 433E of the film material 43E is folded back at the lower end 31K, 32K of the front cover 31 or back cover 32 and connected to the lower end 414E of the holding part 41E. Therefore, the spacer part 42E can be connected to the holding part 41E without protruding from the lower end 31K, 32K of the front cover 31 or back cover 32. This improves the workability of connecting the film material 43E and the holding part 41E, while ensuring a safe state without the spacer member 4E getting in the way when holding the lower end of the paper sheet 1 that has been opened approximately 360 degrees and folded back.

As shown in Figures 1, 2, 6, 9 to 13, in the spacer member 4 (4A) of the first embodiment and its first and second modified examples 4 (4B, 4C), the holding portion 41 is divided into two upper and lower holding pieces 41a, 41b, 41Ca, 41Cb in the longitudinal direction of the binding device 2 (the direction of the arrow N), and the upper holding pieces 41a, 41Ca located at the top and the lower holding pieces 41b, 41Cb located at the bottom are each formed with a locking hole 411 (411A, 411C), and the locking hole 411 (411A, 411C) is formed larger than the binding hole 11 that binds the binding piece 2T of the paper sheet 1.

Therefore, by rotating the upper holding pieces 41a, 41Ca and the lower holding pieces 41b, 41Cb, 41Cb in the longitudinal direction of the binding device 2 (the direction of the arrow N), the locking holes 411 (411A, 411C) of the upper holding pieces 41a, 41Ca and the locking holes 411 (411A, 411C) of the lower holding pieces 41b, 41Cb, 41Cb can be inserted or removed with a sufficient margin into or from the tip 2ST of each open binding piece 2T, allowing the spacer members 4 (4A, 4B, 4C) to be easily attached or removed from the file 10.

This makes it possible to further improve the ease of attachment and detachment of the spacer members 4 (4A, 4B, 4C) to the file 10. As a result, the spacer members 4 (4A, 4B, 4C) can be easily attached to the file 10 as needed, making it easier and more accurate to write letters, pictures, etc. on the paper sheets 1. In addition, since the attached spacer members 4 (4A, 4B, 4C) can be easily removed from the file 10, it is possible to avoid a decrease in storage efficiency when storing the file 10 on a bookshelf, etc.

As shown in Figs. 1 to 3, in the spacer member 4 (4A) of the first embodiment and its first modified example 4 (4B), the inner diameter t2 of the locking hole 411 (411A) is larger than the inner diameter t1 of the binding hole 11 of the paper sheet 1. Therefore, when the paper sheet 1 is normally bound to the binding device 2 (before being folded back approximately 360 degrees), the locking hole 411 (411A) of the holding part 41 can be moved to the inner periphery of the binding piece 2T, and the position of the widthwise inner edge 42N of the spacer part 42 can be brought close to the tip 2ST of the binding piece 2T. The position of the widthwise outer edge 42G of the spacer part 42 can be brought into approximate alignment with the tip 12 on the other end side of the paper sheet 1.

As shown in Figures 7 and 8, when the paper sheet 1 is folded back together with the front cover 31 and the back cover 32, and opened approximately 360 degrees around the binding device 2 as a fulcrum, the locking hole 411 (411A) of the holding part 41 can be moved to the outer periphery of the binding piece 2T, so that the position of the widthwise inner edge 42N of the space part 42 is close to the connecting part 21 (21a) that connects the base end part 2LT of the binding piece 2T. Then, the position of the widthwise outer edge 42G of the space part 42 can be made to approximately coincide with the tip part 12 on the other end side of the paper sheet 1.

As shown in Figs. 9 and 10, the locking holes 411A of the spacer member 4A of the first embodiment and its first modified example 4B are formed as round holes, but as shown in Fig. 13, the locking holes 411C of the second modified example 4C are formed as long holes that are long in the longitudinal direction (the direction of the arrow N). By forming the locking holes 411C as long holes that are long in the longitudinal direction, the ease of attachment and detachment of the spacer member 4C to the file 10 can be further improved, and at the same time, when the spacer member 4C is opened approximately 360 degrees with the binding device 2 as a fulcrum together with the front cover 31 and the back cover 32 and folded back, the straight portion of the locking hole 411C, rather than the arc portion, abuts on the joint between the tip ends 2ST of the binding pieces 2T, which has the effect of making it less likely to get caught.

9 and 10, in the spacer member 4A of the first embodiment and its first modified example 4B, the dividing line 413 between the upper holding piece 41Ca and the lower holding piece 41Cb is formed in a straight line in the width direction of the binding device 2 (the direction of the arrow H), but as shown in FIG. 13, in the spacer member 4 (4C) of the third modified example, the dividing line 413C between the upper holding piece 41Ca and the lower holding piece 41Cb is formed in a wavy shape that curves up and down. By forming the dividing line 413C between the upper holding piece 41Ca and the lower holding piece 41Cb in a wavy shape that curves up and down, it is possible to achieve the effect that the dividing line 413C is unlikely to cause a dent in the paper sheet 1. In addition, by curving the dividing line 413C between the upper holding piece 41Ca and the lower holding piece 41Cb in a wavy shape up and down, it is also possible to achieve the effect that the bending tendency of the space portion 42 is unlikely to occur. This allows you to write letters, pictures, etc. more easily and accurately on the paper sheet 1 that has been opened approximately 360 degrees and then folded back.

As shown in Figures 14 to 17, in the spacer members 4D and 4E of the third and fourth modified examples, the holding portions 41D and 41E are integrally formed on the top and bottom in the longitudinal direction of the binding device 2 (the direction of the arrow N), and the locking holes 411D and 411E are formed as elongated holes in the width direction of the binding device 2 (the direction of the arrow H). Here, the locking holes 411D and 411E are formed in pairs at the top and bottom of the holding portions 41D and 41E, but are not limited to this.

The locking holes 411D, 411E are formed as elongated holes in the width direction of the binding device 2 (the direction of the arrow H). Even if the holding portions 41D, 41E are not divided into upper and lower portions, the elongated locking holes 411D, 411E can be inserted or removed with a sufficient margin into or from the tip portions 2ST of the open binding pieces 2T, allowing the spacer members 4D, 4E to be easily attached or removed from the file 10.

This further improves the ease of attachment and detachment of the spacer members 4D, 4E to the file 10. As a result, the spacer members 4D, 4E can be easily attached to the file 10 as needed, making it easier and more accurate to write letters, pictures, etc. on the paper sheets 1. In addition, since the attached spacer members 4D, 4E can be easily removed from the file 10, it is possible to avoid a decrease in storage efficiency when storing the file 10 on a bookshelf, etc.

In the spacer members 4D and 4E of the third and fourth modified examples, a pair of support pieces 41DN1, 41DN2, 41EN1, and 41EN2 are formed at the upper and lower parts of the holding parts 41D and 41E, protruding inward in the width direction of the binding device 2, and oblong locking holes 411D and 411E are formed in the support pieces 41DN1, 41DN2, 41EN1, and 41EN2, respectively. Therefore, even if the binding pieces 2T are formed only at the upper and lower parts of the binding device 2 in the longitudinal direction (direction of arrow N), the spacer members 4D and 4E can be attached to the file 10.

In addition, the widthwise inner ends 41DN, 41EN of the holding portions 41D, 41E are formed widthwise outward from the widthwise inner ends 42DN, 42EN of the space portions 42D, 42E in areas other than the two support pieces 41DN1, 41DN2, 41EN1, 41EN2. Therefore, even if the binding piece 2T is formed continuously from the top to the bottom in the longitudinal direction of the binding device 2, the spacer members 4D, 4E can be attached to the file 10 without the holding portions 41D, 41E interfering with the binding piece 2T.

Therefore, the spacer members 4D, 4E of the third and fourth modified examples can ensure the ease of attachment and detachment of the spacer members 4D, 4E to various files 10, regardless of the type of binding device 2. As a result, the spacer members 4D, 4E can be easily attached to various files 10 as needed, making it easier and more accurate to write letters, pictures, etc. on the paper sheets 1. In addition, since the attached spacer members 4D, 4E can be easily removed from the various files 10, it is possible to avoid a decrease in storage efficiency when storing the files 10 on a bookshelf, etc.

<Spacer Member of Second Embodiment>
Next, the spacer member of the second embodiment according to this embodiment will be described in detail with reference to Figs. 18 to 22. Fig. 18 shows a front view of a spacer file set to which a spacer member of the second embodiment according to this embodiment is attached, as viewed from the back cover side. Fig. 19 shows a development view of the spacer file set shown in Fig. 18, in which the back cover to which the spacer member of the second embodiment is attached is opened approximately 180 degrees with the binder as a fulcrum. Fig. 20 shows a cross-sectional view taken along line G-G shown in Fig. 18. Fig. 21 shows a cross-sectional view taken along line H-H shown in Fig. 19. Fig. 22 shows a front view of the spacer member of the second embodiment shown in Fig. 19.

As shown in Figures 18 to 22, the spacer member 4 (4F) according to the second embodiment of the present invention is a spacer member 4 that is formed so as to be attachable to a file 10 that includes a binding device 2 having a binding piece 2T whose tip portion 2ST is formed so as to be detachable, and paper sheets 1 bound to the binding piece 2T, and that can open and fold the paper sheets 1 approximately 360 degrees with the binding device 2 as a fulcrum. Here, the differences between the spacer member 4 (4A) according to the first embodiment and its first to fourth modified examples 4 (4B, 4C, 4D, 4E) will be mainly described, and common points will be omitted as much as possible.

The spacer member 4 (4F) of the second embodiment includes a holding portion 41F having a locking hole 411 (411F) inserted through the binding piece 2T and arranged adjacent to the paper sheet 1, and a plate-shaped space portion 42F connected to the holding portion 41F and arranged on the opposite side of the paper sheet 1 before it is opened approximately 360 degrees outside the binding device 2 and folded back, and the space portion 42F is formed to a size that closes the gap W caused by the binding device 2 between the paper sheets 1 opened approximately 360 degrees and folded back. Here, the binding device 2 is equipped with a front cover 31 and a back cover 32 that protect the paper sheet 1 from both the front and back sides, but the front cover 31 or the back cover 32 does not necessarily have to be attached. In addition, the binding device 2 has a mount 1D attached between the paper sheet 1 and the front cover 31 and back cover 32, but the mount 1D does not necessarily have to be attached.

The holding portion 41F is formed to be approximately the same size as the paper sheet 1 and is arranged on the back side of the front cover 31 or back cover 32, and the space portion 42F is formed to be approximately the same size as the area (area for writing or drawing) protruding outward from the binder 2 of the paper sheet 1 opened approximately 360 degrees and folded back, and is arranged on the front side of the front cover 31 or back cover 32. The space portion 42F is formed approximately uniformly with a thickness t3 equivalent to the separation distance on one end side of the front cover 31 and back cover 32 opened approximately 360 degrees and folded back. Here, the holding portion 41F is arranged on the back side of the back cover 32, and the space portion 42F is arranged on the front side of the back cover 32.

The spacer member 4 (4F) of the second embodiment may also be attached to the binding piece 2T so that the spacer portion 42F and the holding portion 41F sandwich the front cover 31 from both the front and back sides. Also, the binding piece 2T may be equipped with a spacer member 4F that sandwiches the back cover 32 from both the front and back sides, and a spacer member 4F that sandwiches the front cover 31 from both the front and back sides.

The space portion 42F is made up of a core material 421 (421A) and a film material 43F that wraps the core material 421 (421A), and is integrally formed from the top and bottom in the longitudinal direction of the binding device 2. The space portion 42F is also connected to the widthwise outer end 41FG of the holding portion 41F such that the widthwise outer end 434F (435F, 436F) of the film material F43F can be folded in the width direction (direction of arrow H) of the binding device 2.

That is, the film material 43F envelops the entire front and back surfaces of the core material 421 (421A) and is connected to the outer periphery of the core material 421 (421A) by welding, sewing, or the like. Also, the widthwise outer end 435F on the front side of the film material 43F is connected to the back side of the widthwise outer end 41FG of the holding part 41F by welding, sewing, or the like, and the widthwise outer end 436F on the back side of the film material 43F is connected to the surface of the widthwise outer end 41FG of the holding part 41F by welding, sewing, or the like. Also, the core material 421 is formed of a resin foam sheet 421A having a required thickness, but may be formed of a resin cardboard sheet 421B having a required thickness.

Therefore, the connecting portion between the spacer 42F and the holding portion 41F is formed in a straight line along the longitudinal direction (direction of the arrow N) of the binding device 2, while the holding portion 41F is arranged on the back side of the front cover 31 or the back cover 32, and the widthwise outer end 434F of the film material 43F is folded back to arrange the spacer 42F on the front side of the front cover 31 or the back cover 32. In this case, the spacer 42F can be connected to the holding portion 41F without protruding from the upper end 31J, 32J and the lower end 31K, 32K of the front cover 31 or the back cover 32. Therefore, the spacer member 4F is not in the way and is in a safe state, and the gap W between the folded paper sheets 1 that are opened approximately 360 degrees is filled, making it easier and more accurate to write letters, pictures, etc. on the paper sheets 1.

The inner diameter t2 of the locking hole 411 (411F) is formed to be approximately the same as the inner diameter t1 of the binding hole 11 that binds the binding piece 2T of the paper sheet 1. However, the widthwise outer end 434F (435F, 436F) of the film material F43F of the space portion 42F is connected to the widthwise outer end 41FG of the holding portion 41F so as to be bendable in the width direction (direction of arrow H) of the binding device 2, so that the locking hole 411 (411F) can be easily inserted into or removed from the tip 2ST of each open binding piece 2T.

This makes it possible to further improve the ease of attachment and detachment of the spacer member 4 (4F) to the file 10. As a result, the spacer member 4 (4F) can be easily attached to the file 10 as needed, making it easier and more accurate to write letters, pictures, etc. on the paper sheets 1. In addition, since the attached spacer member 4 (4F) can be easily removed from the file 10, it is possible to avoid a decrease in storage efficiency when storing the file 10 on a bookshelf, etc.

<Spacer file set>
Next, spacer file sets according to other embodiments will be described in detail with reference to FIGS. 1 to 8, 18 to 20, and 24 to 29. FIG. 1 shows a front view of a spacer file set to which a spacer member according to a first embodiment of the present invention is attached, as seen from the back cover side. FIG. 2 shows a development view of the spacer file set shown in FIG. 1 in a state in which the back cover to which the spacer member of the first embodiment is attached is opened approximately 180 degrees with the binding device as a fulcrum. FIG. 3 shows a cross-sectional view of A-A shown in FIG. 1. FIG. 6 shows a cross-sectional view of the main parts of the spacer file set shown in FIG. 1 when the front cover and back cover are opened approximately 180 degrees and the engagement of the leading ends of the left and right binding pieces is released. FIG. 7 shows a cross-sectional view of the spacer file set shown in FIG. 1 in a state in which the paper sheets are opened approximately 360 degrees together with the front cover and back cover and folded back with the binding device as a fulcrum. FIG. 8 shows an enlarged cross-sectional view of part C shown in FIG. 7. FIG. 18 shows a front view of a spacer file set to which a spacer member according to a second embodiment of the present invention is attached, as viewed from the back cover side. FIG. 19 shows a development view of the spacer file set shown in FIG. 18 in a state in which the back cover to which the spacer member of the second embodiment is attached is opened approximately 180 degrees with the binding tool as a fulcrum. FIG. 20 shows a cross-sectional view G-G shown in FIG. 18. FIG. 24 shows an enlarged cross-sectional view of the binding tool at part C shown in FIG. 7. FIG. 25 shows a partial front view I shown in FIG. 24. FIG. 26 shows a front view of the binding tool shown in FIG. 24 when the engagement between the leading ends of the left and right binding pieces is released. FIG. 27 shows a partial perspective view of the binding tool shown in FIG. 26. FIG. 28 shows a detailed view of part F shown in FIG. 26, where (A) shows a front view when the engagement between the leading ends of the left and right binding pieces is released, and (B) shows a front view when the leading ends of the left and right binding pieces are engaged. FIG. 29 shows an exploded perspective view of the binding device shown in FIG.

As shown in Figs. 1 to 8, 18 to 20, and 24 to 29, the spacer file set 10S according to this embodiment is a spacer file set 10S equipped with the spacer members 4 (4A, 4B, 4C, 4D, 4E, 4F) according to the embodiment described above, and the binding device 2 is equipped with left and right connecting parts 21 (21a, 21b) that connect the base ends 2LT of the binding pieces 2T at appropriate intervals in the longitudinal direction, a plurality of bearing parts 22 (22a, 22b) formed alternately in the longitudinal direction on the left and right connecting parts 21 (21a, 21b), a rotation center shaft 23 that is inserted through each bearing part 22 (22a, 22b) and extended in the longitudinal direction, and a spring member 24 that is attached between the left and right connecting parts 21 (21a, 21b).

The spine 33 connected to the front cover 31 and back cover 32 is fixed to the rear side of either the left or right connecting part 21a, and when the engagement between the tip parts 2ST of the binding pieces 2T is released, the connecting part 21a to which the spine 33 is fixed and the connecting part 21b to which the spine 33 is not fixed are formed so that they can rotate with respect to the rotation center axis 23 at an opening angle α of approximately 80 to 100 degrees due to the biasing force of the spring member 24.

Therefore, for example, when the front cover 31 and back cover 32 are opened approximately 180 degrees with the spine 33 facing downward or diagonally downward, and 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 not easily affected by the spine 33 connected to the front cover 31 and back cover 32, and is instead mainly influenced by the biasing force of the spring member 24 to rotate approximately 80 to 100 degrees.

Therefore, the locking hole 411 of the holding portion 41 in the spacer member 4 can be easily inserted into or removed from the tip portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b. Therefore, the spacer member 4 can be easily attached to or removed from the spacer file set 10S. As described below, the spring member 24 is preferably a compression torsion coil spring 24N or a compression coil spring 24M, but other types of springs (e.g., a torsion coil spring, a tension spring, etc.) can also be used. Different types of spring members 24 may also be combined.

As shown in Figs. 1, 2 and 7, the tip 312 on the other end of the front cover 31 and the tip 322 on the other end of the back cover 32 are preferably provided with shortened portions 31S, 32S that are shortened in the width direction so as to be approximately aligned with the tip 12 on the other end of the paper sheet 1 when the other end of the paper sheet 1 is opened approximately 360 degrees with the front cover 31 and the back cover 32 and folded back with the binding device 2 as the fulcrum, as shown in Fig. 7, when the other end of the paper sheet 1 is opened approximately 360 degrees with the front cover 31 and the back cover 32 and folded back with the binding device 2 as the fulcrum, the shortened portions 31S, 32S do not get in the palm of the hand, and the other end of the paper sheet 1 can be held stably with one hand.

As shown in FIG. 1, when the paper sheets 1 are normally bound to the binding device 2 (before being folded back approximately 360 degrees), the tip 312 on the other end of the front cover 31 and the tip 322 on the other end of the back cover 32 may be formed slightly shorter than the shortened portions 31S and 32S. In this case, when the other end of the paper sheets 1 is opened approximately 360 degrees with the front cover 31 and the back cover 32 as the binding device 2 and folded back, the tip 312 on the other end of the front cover 31 and the tip 322 on the other end of the back cover 32 are slightly recessed from the tip 12 on the other end of the paper sheets 1. Therefore, it is possible to hold the other end of the paper sheets 1 with one hand at a location other than the shortened portions 31S and 32S, and the gripping area when opened approximately 360 degrees can be freely selected, improving convenience.

However, when the tip 312 on the other end of the front cover 31 and the tip 322 on the other end of the back cover 32 are formed shorter than the tip 12 on the other end of the paper sheet 1 when the paper sheet 1 is normally bound to the binding device 2 (before being folded back approximately 360 degrees), there is a risk that the paper sheet 1 may become dirty or damaged in places not protected by the front cover 31 and back cover 32. To prevent this, it is preferable to attach a backing 1D of approximately the same size as the paper sheet 1 so as to sandwich the paper sheet 1, as shown in Figures 3, 6, and 8. The backing 1D may be made of a material such as cardboard or resin that protects the paper sheet 1.

Also, as shown in FIG. 18, when the paper sheets 1 etc. are normally bound to the binding device 2 (before being folded back approximately 360 degrees), a part (e.g., the upper part) of the tip 312 on the other end of the front cover 31 that is not sandwiched between the holding portion 41F and the space portion 42F is formed longer than the tip 322 on the other end of the back cover 32 that is sandwiched between the holding portion 41F and the space portion 42F, so that when the other end of the paper sheets 1 is opened and folded back approximately 360 degrees together with the front cover 31 and the back cover 32, using the binding device 2 as a fulcrum, it is preferable that the tip 322 on the other end of the back cover 32 is shortened relative to the tip 12 on the other end of the paper sheets 1, and a part of the tip 312 on the other end of the front cover 31 protrudes slightly. The amount by which the tip 312 on the other end of the front cover 31 protrudes from the tip 12 on the other end of the paper sheet 1 should be enough to allow a finger to fit over it, for example, 2 to 5 mm.

In this case, when returning the other end of the paper sheet 1 together with the front cover 31 and back cover 32 from the state in which it has been opened and folded approximately 360 degrees to the state before it was folded approximately 360 degrees, a finger can be hooked on the protruding part of the tip 312 on the other end side of the front cover 31, and it can be easily returned to the state before it was folded approximately 360 degrees. This improves operability when returning to the state before it was folded approximately 360 degrees.

In addition, with regard to the above-mentioned content in which a portion (e.g., an upper portion) of the tip portion 312 on the other end side of the front cover 31 is formed longer than the tip portion 322 on the other end side of the back cover 32, the front cover 31 and the back cover 32 may be reversed. That is, when the paper sheets 1 are normally bound to the binding device 2 (before being folded back approximately 360 degrees), a portion (e.g., an upper portion) of the tip 322 on the other end of the back cover 32 that is not sandwiched between the holding portion 41F and the space portion 42F is formed longer than the tip 312 on the other end of the front cover 31 that is sandwiched between the holding portion 41F and the space portion 42F, so that when the other end of the paper sheets 1 is opened approximately 360 degrees and folded back together with the front cover 31 and back cover 32, the tip 312 on the other end of the front cover 31 is shortened relative to the tip 12 on the other end of the paper sheets 1, and a portion of the tip 322 on the other end of the back cover 32 may protrude slightly.

As shown in Figures 24, 26, 27, and 29, the spring member 24 is a compression torsion coil spring 24N that is compressed in the longitudinal direction and attached between the bearing portions 22 (22a, 22b) that are formed alternately in the longitudinal direction (the direction of the arrow N) and that is spirally wound around the outer periphery of the rotation center shaft 23, and it is preferable that one end edge arm portion 241 of the compression torsion coil spring 24N biases one connecting portion 21a to which the spine 33 is fixed toward the rear side, and the other end edge arm portion 242 of the compression torsion coil spring 24N biases the other connecting portion 21b to which the spine 33 is not fixed, toward the width direction outward.

In this case, when the front cover 31 and back cover 32 are opened approximately 180 degrees and the tip ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are disengaged from each other, most of the torsional biasing force R of the compression torsion coil spring 24N acts as a moment force that rotates the other connecting part 21b to which the spine 33 is not fixed outward in the width direction.

Therefore, the tip 2STb of the other binding piece 2Tb connected to the other connecting part 21b is held in a stable position by the biasing force R in the torsional direction of the compression torsion coil spring 24N. Therefore, the locking hole 411 of the holding part 41 in the spacer member 4 can be more easily inserted into or removed from the tip 2STb of the binding piece 2Tb held in a stable position. As a result, the gap W between the front cover 31 and the back cover 32, which are opened approximately 360 degrees and folded back, can be more easily filled by the space part 42, and letters, pictures, etc. can be written on the paper sheet 1 more easily and accurately.

Although one compression torsion coil spring 24N is attached near the longitudinal center of the connecting portion 21 (21a, 21b), two or more may be attached. The attachment position of the compression torsion coil spring 24N does not necessarily have to be near the longitudinal center. The biasing force Q of the compression torsion coil spring 24N, which tries to expand in the longitudinal direction (axial direction), acts in a direction to engage the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb), and the biasing force R, which twists 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 parts 21 (21a, 21b) in the opposite directions in the longitudinal direction to release the engagement between the tip ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb), the tip ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) will automatically move apart in the width direction due to the torsional biasing force R of the compression torsion coil spring 24.

As shown in Figures 26 to 29, the longitudinal end faces of adjacent bearing portions 22 (22a, 22b) are each provided with a cam surface 221 (221a, 221b) formed at an incline with respect to the rotation center axis 23, and it is preferable that the cam surfaces 221 (221a, 221b) are formed so as to be separated from each other when the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are in an engaged state, and to abut each other when in a released state.

In this case, when the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are disengaged, the cam surfaces 221 (221a, 221b) come into contact with each other, and the biasing force Q of the compression torsion coil spring 24N that 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 force of holding the opening angle α between the left and right connecting parts 21 (21a, 21b) can be increased through the bearing parts 22 (22a, 22b) to which the biasing force Q of the compression torsion coil spring 24N that expands in the longitudinal direction is transmitted. Therefore, the opening angle α between the left and right connecting parts 21 (21a, 21b) can be held at its maximum. As a result, when the locking hole 411 of the holding part 41 of the spacer member 4 is inserted into or removed from the tip part 2ST (2STa, 2STb) of the binding piece 2T (2Ta, 2Tb), the tip part 2ST (2STa, 2STb) of the binding piece 2T (2Ta, 2Tb) can be more reliably maintained in a spaced state, and the possibility that the locking hole 411 of the holding part 41 of the spacer member 4 will get caught on the tip part 2ST (2STa, 2STb) of the binding piece 2T (2Ta, 2Tb) can be further reduced.

In addition, a compression coil spring 24M can be used instead of the compression torsion coil spring 24N. In that case, the biasing force Q of the compression coil spring 24M expanding in the longitudinal direction is transmitted to the bearing portion 22 (22a, 22b) via the cam surface 221 (221a, 221b), and the left and right connecting portions 21 (21a, 21b) can be rotated in the opening direction.

In addition, it is preferable that the bearing portion 22 (22a, 22b) provided with the cam surface 221 (221a, 221b) is provided at least near the longitudinal end of the connecting portion 21 (21a, 21b). This allows the biasing force Q of the compressed torsion coil spring 24N, which extends in the longitudinal direction, to act on the cam surface 221 (221a, 221b) when the engagement between the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, so that the opening angle α of the connecting portion 21 (21a, 21b) near the longitudinal end of the binding device 2 can be maintained at a maximum.

Therefore, even in a file in which the longitudinal length of the binding device 2 is large (such as a large sketchbook), the tip ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) can be more reliably maintained apart from each other, further reducing the possibility that the tip ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) will get caught in the locking hole 411 of the retaining portion 41 in the spacer member 4.

In addition, the bearing portion 22 (22a, 22b) with the cam surface 221 (221a, 221b) is provided at least near the longitudinal end of the connecting portion 21 (21a, 21b), so that the opening angle α of the connecting portion 21 (21a, 21b) near the longitudinal end of the binding device 2 can be maintained at a maximum, thereby complementing the torsional rigidity of the connecting portion 21 (21a, 21b) in the longitudinal direction.

Therefore, for example, the compression torsion coil spring 24N can be made more compact, and the thickness (width dimension) of the connecting portion 21 (21a, 21b) can be made as thin as possible. Therefore, when the other end side of the paper sheet 1 is opened 360 degrees with the front cover 31 and the back cover 32 around the binding device 2 as a fulcrum and folded back, the gap W between the front cover 31 and the back cover 32 by the connecting portion 21 (21a, 21b) at one end side of the paper sheet 1 can be reduced, and the thickness t3 of the space portion 42 in the spacer member 4 can be made thin. As a result, a more compact spacer file set 10S can be provided. In addition, by making the thickness (width dimension) of the connecting portion 21 (21a, 21b) as thin as possible, the number of paper sheets 1 that can be bound by the binding device 2 when opened 360 degrees and folded back can be further increased. Therefore, a spacer file set 10S that is compact yet can store a large amount of paper sheets 1 can be provided.

Furthermore, as shown in Figures 25 to 27, the base ends 2LT (2LTa, 2LTb) of the left and right binding pieces 2T (2Ta, 2Tb) are formed with a dimension of at least the plate width d4 in the longitudinal direction (direction of arrow N) and are offset from each other in the longitudinal direction, and it is preferable that the tip ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are formed with engagement portions 2GT (2GTa, 2GTb) that protrude a predetermined length inward in the width direction (direction of arrow H) from the tip side of the base ends 2LT (2LTa, 2LTb) and engage with each other at inclined portions 2QT (2QTa, 2QTb) that are inclined in the longitudinal direction from the position protruding inward in the width direction. In this case, when multiple spacer file sets 10S are stacked and stored in a bookshelf or the like, interference between the binding devices 2 of adjacent spacer file sets 10S can be avoided, and the number of files that can be stored in a bookshelf or the like can be increased.

As shown in FIG. 25, the engagement portions 2GTa, 2GTb formed at the tip portions 2STa, 2STb of the left and right binding pieces 2Ta, 2Tb have convex portions 2GT1a, 2GT1b formed at the tip end side that protrude in a mountain shape in the board width direction, and concave portions 2GT2a, 2GT2b formed at the base end side that engage with the mating convex portions 2GT1a, 2GT1b in the longitudinal and lateral directions. This ensures that the engagement portions 2GTa, 2GTb engage with each other in the longitudinal and lateral directions, and makes it possible to avoid inadvertent disengagement.

As shown in Figures 3, 6, and 20, the left and right binding pieces 2T (2Ta, 2Tb) are formed with an approximately U-shaped cross section facing each other, and the depth d2 of the bottom 2KTb of the approximately U-shaped cross section at the base end 2LTb relative to the tip end 2STb of the other binding piece 2Tb connected to the other connecting part 21b to which the spine 33 is not fixed is formed to be larger than the depth d1 of the bottom 2KTa of the approximately U-shaped cross section at the base end 2LTa relative to the tip end 2STa of one binding piece 2Ta connected to one connecting part 21a to which the spine 33 is fixed, and it is preferable that the locking hole 411 of the retaining part 41 is locked to the other binding piece 2Tb.

In this case, the amount of protrusion of the bottom 2KTb of the approximately U-shaped cross section of the other binding piece 2Tb relative to the spacer 42 can be increased. Therefore, the number of sheets 1 to be bound by the binding device 2 can be increased without having the spacer 42 protrude outward from the bottom 2KTb of the approximately U-shaped cross section of the other binding piece 2Tb. Therefore, even if the number of sheets 1 to be bound by the binding device 2 is increased, the spacer file set 10S can be easily carried without the spacer 42 getting in the way.

As shown in FIG. 24, in the other binding piece 2Tb, the inner angle β at the position where the root of the base end 2LTb protruding diagonally outward from the side wall of the other connecting portion 21b intersects with the bottom 2KTb of the approximately U-shaped cross section is preferably formed as an obtuse angle of about 100 to 120 degrees. Also, as shown in FIG. 20, the corner R at the position where the bottom 2KTb of the approximately U-shaped cross section intersects with the tip 2STb is preferably formed larger than the corresponding corner R of one binding piece 2Ta. In this case, there is an advantage that it is easy to avoid deformation or catching of the locking hole 411 of the holding part 41 and deformation of the binding hole 11 of the paper sheets 1 when folding back many paper sheets 1 360 degrees via the bottom 2KTb of the approximately U-shaped cross section with a deep depth d2.

In addition, it is preferable that the bottoms 2KTa, 2KTb of the approximately U-shaped cross section are formed so as to be approximately parallel to each other, outside the left and right connecting portions 21 (21a, 21b) in the width direction, when the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are engaged. This allows more paper sheets 1 to be bound while minimizing the width dimension of the binding pieces 2T (2Ta, 2Tb). Even in this case, it is preferable to form the corners (bent portions) of the left and right binding pieces 2T (2Ta, 2Tb) formed in the approximately U-shaped cross section in an arc shape. This allows more sheets 1 to be folded 360 degrees around the binding pieces 2T (2Ta, 2Tb) smoothly without the locking holes 411 of the holding part 41 or the binding holes 11 of the sheets 1 getting caught on the corners (bent parts) of the binding pieces 2T (2Ta, 2Tb).

As shown in FIG. 24, the rotation center shaft 23 is preferably positioned at a position offset by a predetermined amount d3 toward the other connecting portion 21b to which the spine 33 is not fixed with respect to the widthwise center line CL of one connecting portion 21a to which the spine 33 is fixed. In this case, the stopper portions 212a, 212b that release the engagement between the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) and hold the opening angle α of the left and right connecting portions 21 (21a, 21b) at a maximum state can be formed on the widthwise side side of one connecting portion 21a and the back side of the other connecting portion 21b. Therefore, the stopper portions 212a, 212b can be provided at suitable positions in the longitudinal direction while ensuring the necessary widthwise thickness of one connecting portion 21a and the other connecting portion 21b.

In addition, by providing the stopper portions 212a, 212b at suitable positions in the longitudinal direction, the opening angle α between the left and right connecting portions 21 (21a, 21b) can be maintained approximately equal in the longitudinal direction. As a result, when the engagement between the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released and the locking hole 411 of the holding portion 41 in the spacer member 4 is released from the binding piece 2T or locked to the binding piece 2T, the separation distance between the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) in the entire longitudinal direction is maintained approximately equal, and the possibility that the locking hole 411 of the holding portion 41 will get caught on the tip portion 2ST of the binding piece 2T can be further reduced.

As shown in Figs. 1, 3, 4, 5, 18 and 20, the back side of one of the connecting parts 21a is preferably formed with a plurality of claw-shaped locking parts 211, each of which consists of a base 211P that stands symmetrically with respect to the longitudinal center and a claw part 211T that is wider than the base 211P and protrudes from the tip of the base toward the longitudinal center, and the spine 33 is preferably formed with a spine locking hole 33H in the form of a long hole of different diameters through which the claw part 211T passes at the large diameter part 331 and which is sandwiched by the claw part 211T while being engaged with the base 211P at the small diameter part 332.

With this, the longitudinal center of the spine 33 is curved into a mountain shape, the claw portion 211T is passed through the large diameter portion 331 of the spine locking hole 33H, and then the longitudinal center of the spine 33 is returned to a flat state, and with the base portion 211P engaged with the small diameter portion 332 of the spine locking hole 33H, the claw portion 211T can clamp and restrain the small diameter portion 332 of the spine locking hole 33H.

Therefore, the spine 33 can be easily fixed to the rear side of one of the connecting parts 21a, and there is no need to attach a new connecting member to one of the connecting parts 21a to fix the spine 33. Therefore, by simplifying the structure of one of the connecting parts 21a that fixes the spine 33, when the other end side of the paper sheet 1 is opened approximately 360 degrees with the front cover 31 and the back cover 32 around the binder 2 as a fulcrum and folded back, the gap W between the front cover 31 and the back cover 32 by the connecting part 21 at one end side of the paper sheet 1 can be minimized, and the thickness t3 of the space portion 42 in the spacer member 4 can be minimized. As a result, the spacer file set 10S can be carried8 without the space portion 42 getting in the way.

The claw-shaped locking portion 211 is formed in an L-shape in a side view by connecting the base 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 of the connecting portions 21a, a slight recess 21H is formed around the base 211P to minimize the outward protrusion of the claw portion 211T and to facilitate insertion of the spine locking hole 33H. In addition, by minimizing the outward protrusion of the claw portion 211T, as shown in FIG. 8, when the paper sheet 1 is opened approximately 360 degrees with the binding device 2 as a fulcrum and folded back together with the front cover 31 and the back cover 32, the widthwise inner end 42N of the space portion 42 can be brought even closer to the connecting portion 21 (21a) that connects the base end 2LT of the binding piece 2T.

As shown in Figs. 1 and 18, a label sheet 34 is attached to the spine 33 in the longitudinal center, avoiding the claw-shaped engaging portion 211 and the binding piece 2T, and the label sheet 34 preferably extends to the front cover 31 and the back cover 32 without being hidden by the space portion 42. This allows the name of the spacer file set 10S to be written on the label sheet 34, improving the identifiability and searchability of the spacer file set 10S.

<Action and effect>
As described above in detail, according to the spacer member 4 according to the present embodiment, the spacer member 4 (4A, 4B, 4C, 4D, 4E, 4F, 4H) includes the holding portions 41, 41D, 41E, 41F, 41H having the locking holes 411 inserted through the binding pieces 2T and arranged adjacent to the paper sheets 1, and the plate-shaped space portions 42, 42D, 42E, 42F, 42H connected to the holding portions and arranged on the opposite side of the paper sheets 1 before they are opened approximately 360 degrees outside the binding device 2 and folded back. The space portions 42, 42D, 42E, 42F, and 42H are formed to a size sufficient to close the gaps W created by the binding device 2 between the paper sheets 1 that have been opened approximately 360 degrees and folded back. Therefore, when the paper sheets 1 are opened approximately 360 degrees and folded back with the binding device 2 as a fulcrum, the space portions 42, 42D, 42E, 42F, and 42H can be inserted into the areas of the paper sheets 1 that protrude outward from the binding device 2 (areas for writing or drawing), thereby completely suppressing bending of the paper sheets 1.

Therefore, according to this embodiment, it is possible to provide a spacer member 4 that closes the gaps W between the paper sheets 1 that are opened approximately 360 degrees and folded back while the paper sheets 1 are bound by a detachable binding device 2, and allows characters, pictures, etc. to be written easily and accurately on the paper sheets 1.

In addition, according to this embodiment, the binding device 2 is fitted with a front cover 31 and a back cover 32 that protect the paper sheet 1 from both the front and back sides, the holding portions 41, 41D, 41E, and 41F are formed to be approximately the same size as the paper sheet 1 and are arranged on the back side of the front cover 31 or the back cover 32, and the space portions 42, 42D, 42E, and 42F are approximately the same size as the area (area for writing or drawing) of the paper sheet 1 that is opened approximately 360 degrees and folded back and protrudes outward from the binding device 2. and arranged on the surface side of the front cover 31 or the back cover 32, so that when the paper sheet 1 is opened approximately 360 degrees together with the front cover 31 and the back cover 32 around the binding device 2 as a fulcrum and folded back, the space portions 42, 42D, 42E, 42F connected to the holding portions 41, 41D, 41E, 41F are also folded back together, and the space portions 42, 42D, 42E, 42F are automatically inserted between the front cover 31 and the back cover 32 which have been opened approximately 360 degrees and folded back. The space portions 42, 42D, 42E, and 42F are formed to be approximately the same size as the area (area for writing or drawing) of the paper sheet 1 that is opened approximately 360 degrees and folded back and protrudes outward from the binder 2. Therefore, when writing or drawing on the paper sheet 1 that is folded back 360 degrees, the space portions 42, 42D, 42E, and 42F do not protrude outward from the outer edge of the paper sheet 1, and the gaps W between the paper sheets 1 can be reliably filled by the space portions 42, 42D, 42E, and 42F. As a result, the paper sheet 1 that is folded back 360 degrees is easy to grip, the entire paper sheet 1 is less likely to bend, and letters, pictures, and the like can be written more easily and accurately.

In addition, according to this embodiment, the space portions 42, 42D, 42E are composed of a core material 421 and a film material 43, 43D, 43E that wraps the core material 421, and are integrally formed vertically in the longitudinal direction of the binding device 2, and the upper end portions 432, 432D, 432E of the film materials 43, 43D, 43E are aligned with the upper end portions 412, 412D, 41E of the holding portions 41, 41D, 41E at the positions of the upper end portions 31J, 32J of the front cover 31 or the back cover 32. 12E, and the lower ends 433, 433D, 433E of the film material 43, 43D, 43E are connected to the lower ends 414, 414D, 414E of the holding parts 41, 41D, 41E at the positions of the lower ends 31K, 32K of the front cover 31 or the back cover 32, so that the vertical positions of the space parts 42, 42D, 42E can be regulated by the upper ends 31J, 32J and the lower ends 31K, 32K of the front cover 31 or the back cover 32. Therefore, the space parts 42, 42D, 42E open approximately 360 degrees and close the gaps W between the folded back paper sheets 1 more accurately in the longitudinal direction of the binder 2, making it easier and more accurate to write letters, pictures, etc. on the paper sheets 1.

In addition, according to this embodiment, the upper ends 432, 432D of the film material 43, 43D are folded back at the upper ends 31J, 32J of the front cover 31 or back cover 32 and connected to the upper ends 412, 412D of the holding parts 41, 41D, and the lower ends 433, 433D of the film material 43, 43D are folded back at the lower ends 31K, 32K of the front cover 31 or back cover 32 and connected to the lower ends 414, 414D of the holding parts 41, 41D, so that the spacer parts 42, 42D can be connected to the holding parts 41, 41D without protruding from the upper ends 31J, 32J and lower ends 31K, 32K of the front cover 31 or back cover 32. Therefore, the spacer members 4, 4D can close the gaps W between the folded paper sheets 1 that are opened approximately 360 degrees and in a safe state without getting in the way, and letters, pictures, etc. can be written on the paper sheets 1 more easily and accurately.

In addition, according to this embodiment, the upper end 432E of the film material 43E is connected to the upper end 412E of the holding portion 41E protruding upward from the upper end 31J, 32J of the front cover 31 or the back cover 32, so the upper end 432E of the film material 43E and the upper end 412E of the holding portion 41E can be easily connected by welding, sewing, etc. Also, the lower end 433E of the film material 43E is folded back at the lower end 31K, 32K of the front cover 31 or the back cover 32 and connected to the lower end 414E of the holding portion 41E, so the spacer portion 42E can be connected to the holding portion 41E without protruding from the lower end 31K, 32K of the front cover 31 or the back cover 32. Therefore, while improving the workability of connecting the film material 43E and the holding portion 41E, when gripping the paper sheet 1 that has been opened and folded back by approximately 360 degrees, the spacer member 4E does not get in the way and a safe state can be ensured.

In addition, according to this embodiment, the holding portions 41D, 41E are integrally formed on the top and bottom in the longitudinal direction (direction of arrow N) of the binding device 2, and the locking holes 411D, 411E are formed in the shape of elongated holes in the width direction (direction of arrow H) of the binding device 2, so that the elongated locking holes 411D, 411E can be inserted or removed with a margin into or from the tip 2ST of each open binding piece 2T, and the spacer members 4D, 4E can be easily attached or removed from the file 10. Therefore, the attachability and detachability of the spacer members 4D, 4E to the file 10 can be further improved. As a result, the spacer members 4D, 4E can be easily attached to the file 10 as needed, and letters, pictures, etc. can be written on the paper sheets 1 more easily and accurately. In addition, since the attached spacer members 4D, 4E can be easily removed from the file 10, it is possible to avoid a decrease in storage efficiency when storing the file 10 in a bookshelf, etc.

Furthermore, according to this embodiment, a pair of support pieces 41DN1, 41DN2, 41EN1, 41EN2 protruding inward in the width direction of the binding device 2 are formed at the upper and lower parts of the holding portions 41D, 41E, and oblong locking holes 411D, 411E are formed in the support pieces 41DN1, 41DN2, 41EN1, 41EN2, respectively. Therefore, even if the binding pieces 2T are formed only at the upper and lower parts in the longitudinal direction (direction of arrow N) of the binding device 2, the spacer members 4D, 4E can be attached to the file 10. In addition, the widthwise inner ends 41DN, 41EN of the holding parts 41D, 41E are formed outward in the widthwise direction from the widthwise inner ends 42DN, 42EN of the space parts 42D, 42E in the regions other than the two support pieces 41DN1, 41DN2, 41EN1, 41EN2, so that even if the binding pieces 2T are continuously formed from the top to the bottom in the longitudinal direction of the binding device 2, the holding parts 41D, 41E do not interfere with the binding pieces 2T, and the spacer members 4D, 4E can be attached to the file 10. Therefore, regardless of the type of binding device 2, the attachability and detachability of the spacer members 4D, 4E to various files 10 can be ensured. As a result, the spacer members 4D, 4E can be easily attached to various files 10 as necessary, and letters, pictures, etc. can be written on the paper sheets 1 more easily and accurately. In addition, the attached spacer members 4D and 4E can be easily removed from the various files 10, which helps to avoid a decrease in storage efficiency when storing the files 10 on a bookshelf or the like.

In addition, according to this embodiment, the holding portion 41 is divided into two holding pieces 41a and 41b, one above the other, in the longitudinal direction (the direction of the arrow N) of the binding device 2, and the upper holding piece 41a located at the top and the lower holding piece 41b located at the bottom are each formed with a locking hole 411A, which is larger than the binding hole 11 that binds the binding piece 2T of the paper sheet 1. Therefore, the locking hole 411A of the upper holding piece 41a and the locking hole 411A of the lower holding piece 41b can be inserted or removed with a margin into or from the tip portion 2ST of each open binding piece 2T, and the spacer member 4 (4A, 4B, 4C) can be easily attached or removed from the file 10. Therefore, the attachability and detachability of the spacer member 4 (4A, 4B, 4C) to the file 10 can be further improved. As a result, the spacer members 4 (4A, 4B, 4C) can be easily attached to the file 10 as needed, making it easier and more accurate to write letters, pictures, etc. on the paper sheets 1. In addition, the attached spacer members 4 (4A, 4B, 4C) can be easily removed from the file 10, so it is possible to avoid a decrease in storage efficiency when storing the file 10 on a bookshelf, etc.

In addition, according to this embodiment, the parting line 413C between the upper holding piece 41Ca and the lower holding piece 41Cb is formed in a wave-like shape that curves up and down, so that the parting line 413C is less likely to cause a dent in the paper sheet 1. In addition, because the parting line 413C between the upper holding piece 41Ca and the lower holding piece 41Cb is curved in a wave-like shape up and down, the space portion 42 is less likely to bend. Therefore, it is easier and more accurate to write letters, pictures, etc. on the paper sheet 1 that is opened approximately 360 degrees and folded back.

In addition, according to this embodiment, the space portion 42F is composed of the core material 421 and the film material 43F that wraps the core material 421, and the widthwise outer end 434F (435F, 436F) of the film material F43F is connected to the widthwise outer end 41FG of the holding portion 41F so that it can be folded in the width direction (direction of arrow H) of the binding device 2. Therefore, while forming the connecting portion between the space portion 42F and the holding portion 41F in a straight line along the longitudinal direction (direction of arrow N) of the binding device 2, the holding portion 41F can be disposed on the back side of the front cover 31 or back cover 32, and the widthwise outer end 434F of the film material 43F can be folded back to dispose the space portion 42F on the front side of the front cover 31 or back cover 32. In this case, the space portion 42F can be connected to the holding portion 41F without protruding from the upper ends 31J, 32J and lower ends 31K, 32K of the front cover 31 or back cover 32. Therefore, the spacer member 4F safely closes the gaps W between the sheets 1 that have been opened approximately 360 degrees and folded back, making it easier and more accurate to write letters, pictures, etc. on the sheets 1.

In addition, according to this embodiment, the core material 421 is made of a resin foam sheet 421A or a resin cardboard sheet 421B having the required thickness, so that the required rigidity of the space portion 42 is ensured while reducing the weight. In addition, the resin foam sheet 421A or the resin cardboard sheet 421B has a certain degree of elasticity, so that letters, pictures, etc. can be written on the paper sheet 1 more easily.

In addition, according to the spacer file set 10S according to this other embodiment, the binding device 2 includes left and right connecting portions 21 (21a, 21b) that connect the base ends 2LT of the binding pieces 2T at appropriate intervals in the longitudinal direction, a plurality of bearing portions 22 (22a, 22b) that are alternately formed in the longitudinal direction (the direction of the arrow N) on the left and right connecting portions 21 (21a, 21b), a rotation center shaft 23 that is inserted into each bearing portion 22 (22a, 22b) and extends in the longitudinal direction, and a spring member 24 that is attached between the left and right connecting portions 21 (21a, 21b). A spine 33 that is connected to a front cover 31 and a back cover 32 is fixed to the rear side of either the left or right connecting portion 21a, and the engagement between the tip ends 2ST of the binding pieces 2T is prevented. When the spine 33 is released, the one connecting portion 21a to which the spine 33 is fixed and the other connecting portion 21b to which the spine 33 is not fixed are formed to be rotatable by the biasing force of the spring member 24 to a state in which the opening angle α of each other with respect to the rotation center axis 23 is approximately 80 to 100 degrees. Therefore, for example, when the engagement between the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released with the spine 33 facing downward or diagonally downward and the front cover 31 and the back cover 32 opened approximately 180 degrees, the other connecting portion 21b is not easily influenced by the spine 33 connected to the front cover 31 and the back cover 32, so it rotates approximately 80 to 100 degrees mainly under the influence of the biasing force of the spring member 24. Therefore, the locking hole 411 of the holding portion 41 in the spacer member 4 can be easily inserted into or removed from the tip portion 2STb of the other binding piece 2Tb connected to the other connecting portion 21b. Therefore, the spacer member 4 can be easily attached and detached from the spacer file set 10S.

According to this embodiment, the spring member 24 is a compression torsion coil spring 24N that is compressed in the longitudinal direction between the bearing parts 22 (22a, 22b) that are arranged alternately in the longitudinal direction (the direction of the arrow N) and is wound in a spiral shape around the outer periphery of the rotation center shaft 23. One end edge arm part 241 of the compression torsion coil spring 24N biases one connecting part 21a to which the spine 33 is fixed toward the rear side, and the other end edge arm part 241 of the compression torsion coil spring 24N biases one connecting part 21a to which the spine 33 is fixed toward the rear side. 42 biases the other connecting portion 21b to which the spine 33 is not fixed outward in the width direction, so that when the front cover 31 and back cover 32 are opened approximately 180 degrees and the ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are disengaged from each other, most of the biasing force R in the twisting direction by the compression torsion coil spring 24N acts as a moment force that rotates the other connecting portion 21b to which the spine 33 is not fixed outward in the width direction.

Therefore, the tip 2STb of the other binding piece 2Tb connected to the other connecting part 21b is held in a stable position by the biasing force R in the torsional direction of the compression torsion coil spring 24N. Therefore, the locking hole 411 of the holding part 41 in the spacer member 4 can be more easily inserted into or removed from the tip 2STb of the binding piece 2Tb held in a stable position. As a result, the gap W between the front cover 31 and the back cover 32, which are opened approximately 360 degrees and folded back, can be more easily blocked by the space part 42, making it easier to write letters, pictures, etc. on the paper sheet 1.

Furthermore, according to this other embodiment, the longitudinal end faces of adjacent bearing portions 22 (22a, 22b) are each provided with cam surfaces 221 (221a, 221b) formed at an incline with respect to the rotation center axis 23, and the cam surfaces 221 (221a, 221b) are formed so as to be separated from each other when the tip ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are in an engaged state and to abut each other when they are in a released state. Therefore, when the engagement of the tip ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released, the cam surfaces 221 (221a, 221b) abut against each other, and a biasing force Q that causes the compression torsion coil spring 24N to expand in the longitudinal direction is transmitted to the bearing portions 22 (22a, 22b) in which the cam surfaces 221 (221a, 221b) are formed. Therefore, the holding force of the opening angle α between the left and right connecting parts 21 (21a, 21b) can be strengthened through the bearing parts 22 (22a, 22b) to which the biasing force Q of the compression torsion coil spring 24N that expands in the longitudinal direction is transmitted. Therefore, the opening angle α between the left and right connecting parts 21 (21a, 21b) can be held in a maximum state. As a result, when the locking parts 411 of the support parts 41 of the spacer member 4 are inserted into or removed from the tip parts 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb), the separation state between the tip parts 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) can be more reliably maintained, and the possibility that the locking holes 411 of the holding parts 41 of the spacer member 4 will be caught by the tip parts 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) can be further reduced. In addition, here, a compression coil spring 24M can be used instead of the compression torsion coil spring 24N.

Furthermore, according to this other embodiment, the bearing portion 22 (22a, 22b) having the cam surface 221 (221a, 221b) is provided at least near the longitudinal end of the connecting portion 21 (21a, 21b). Therefore, when the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are disengaged, the biasing force Q of the compressed torsion coil spring 24N extending in the longitudinal direction acts on the cam surface 221 (221a, 221b), thereby maintaining the opening angle α of the connecting portion 21 (21a, 21b) in the vicinity of the longitudinal end of the binding device 2 at its maximum. Therefore, even in a file with a large longitudinal length of the binding device 2 (such as a large sketchbook), the tip ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) can be more reliably maintained apart from each other, further reducing the possibility that the tip ends 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) will get caught in the locking holes 411 of the retaining portions 41 of the spacer member 4.

In addition, the opening angle α of the connecting portion 21 (21a, 21b) near the longitudinal end of the binding device 2 can be maintained at its maximum, so that the torsional rigidity of the connecting portion 21 (21a, 21b) in the longitudinal direction can be complemented. Therefore, for example, the compression torsion coil spring 24N can be made more compact, and the thickness (width dimension) of the connecting portion 21 (21a, 21b) can be made as thin as possible. Therefore, when the other end side of the paper sheet 1 is opened 360 degrees with the front cover 31 and the back cover 32 around the binding device 2 as a fulcrum and folded back, the gap W between the front cover 31 and the back cover 32 by the connecting portion 21 (21a, 21b) at one end side of the paper sheet 1 can be reduced, and the thickness t3 of the space portion 42 in the spacer member 4 can be made thin. As a result, a more compact spacer file set 10S can be provided.

In addition, according to this other embodiment, the base ends 2LT (2LTa, 2LTb) of the left and right binding pieces 2T (2Ta, 2Tb) are formed with a dimension of the plate width d4 or more in the longitudinal direction and are offset from each other in the longitudinal direction (direction of arrow N), and the tip ends 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) are formed with engagement parts 2GT (2GTa, 2GTb) that protrude inward in the width direction by a predetermined length from the tip side of the base ends 2LT (2LTa, 2LTb) and engage with each other at the inclined parts 2QT (2QTa, 2QTb) that are inclined in the longitudinal direction from the position protruding inward in the width direction. Therefore, when multiple spacer file sets 10S are stacked and stored in a bookshelf, etc., interference between the binding devices 2 of adjacent spacer file sets 10S can be avoided, and the number of files that can be stored in a bookshelf, etc. can be increased.

In addition, according to this other embodiment, the left and right binding pieces 2T (2Ta, 2Tb) are formed with an approximately U-shaped cross section facing each other, and the depth d2 of the bottom 2KTb of the approximately U-shaped cross section at the base end 2LTb relative to the tip end 2STb of the other binding piece 2Tb connected to the other connecting portion 21b to which the spine 33 is not fixed is formed to be larger than the depth d1 of the bottom 2KTa of the approximately U-shaped cross section at the base end 2LTa relative to the tip end 2STa of one binding piece 2Ta connected to one connecting portion 21a to which the spine 33 is fixed, and since the locking hole 411 of the retaining portion 41 is locked in the other binding piece 2Tb, the protrusion amount of the bottom 2KTb of the approximately U-shaped cross section of the other binding piece 2Tb relative to the space portion 42 can be increased. Therefore, the number of sheets 1 to be bound by the binding device 2 can be increased without having the spacer 42 protrude outward from the bottom 2KTb of the substantially U-shaped cross section of the other binding piece 2Tb. Therefore, even if the number of sheets 1 to be bound by the binding device 2 is increased, the spacer file set 10S can be carried without the spacer 42 getting in the way.

In addition, according to this other embodiment, the rotation center shaft 23 is positioned at a position offset by a predetermined amount d3 toward the other connecting part 21b to which the spine 33 is not fixed with respect to the widthwise center line CL of one connecting part 21a to which the spine 33 is fixed, so that the stopper parts 212a, 212b that release the engagement between the tip parts 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) and hold the opening angle α of the left and right connecting parts 21 (21a, 21b) at a maximum state can be formed on the widthwise side side of one connecting part 21a and the back side of the other connecting part 21b. Therefore, the stopper parts 212a, 212b can be provided at a suitable position in the longitudinal direction while ensuring the necessary widthwise thickness of one connecting part 21a and the other connecting part 21b.

In addition, by providing the stopper portions 212a, 212b at suitable positions in the longitudinal direction, the opening angle α between the left and right connecting portions 21 (21a, 21b) can be maintained approximately equal in the longitudinal direction. As a result, when the engagement between the tip portions 2ST (2STa, 2STb) of the left and right binding pieces 2T (2Ta, 2Tb) is released and the locking hole 411 of the holding portion 41 in the spacer member 4 is released from the binding piece 2T or locked to the binding piece 2T, the separation distance between the tip portions 2ST (2STa, 2STb) of the binding pieces 2T (2Ta, 2Tb) in the entire longitudinal direction is maintained approximately equal, and the possibility that the locking hole 411 of the holding portion 41 will get caught on the tip portion 2ST of the binding piece 2T can be further reduced.

According to this other embodiment, the back side of one of the connecting parts 21a is made up of a base 211P that stands in a symmetrical position with respect to the center of the longitudinal direction, and a claw part 211T that is formed wider than the base 211P, and the claw part 211T is formed so that a plurality of claw-shaped engaging parts 211 are protruded from the tip of the base toward the center of the longitudinal direction, and the claw part 211T passes through the large diameter part 331 of the spine 33 and engages with the base 211P at the small diameter part 332. The spine cover locking hole 33H is formed as a long hole of different diameters that is sandwiched between the claws 211T. With the longitudinal center of the spine 33 curved in a mountain shape, the claws 211T are passed through the large diameter portion 331 of the locking hole 33H, and then the longitudinal center of the spine 33 is returned to a flat state, and with the base 211P engaged with the small diameter portion 332 of the spine cover locking hole 33H, the small diameter portion 332 of the spine cover locking hole 33H can be clamped and restrained by the claws 211T.

Therefore, the spine 33 can be easily fixed to the rear side of one of the connecting parts 21a, and there is no need to attach a new connecting member to one of the connecting parts 21a to fix the spine 33. Therefore, by simplifying the structure of one of the connecting parts 21a that fixes the spine 33, when the other end side of the paper sheet 1 is opened approximately 360 degrees with the front cover 31 and the back cover 32 around the binder 2 as a fulcrum and folded back, the gap W between the front cover 31 and the back cover 32 by the connecting part 21 at one end side of the paper sheet 1 can be minimized, and the thickness t3 of the space part 42 in the spacer member 4 can be minimized. As a result, the space part 42 does not get in the way, and the spacer file set 10S can be easily carried.

In addition, according to this embodiment, a label sheet 34 is attached to the spine 33 in the longitudinal center, avoiding the claw-shaped engaging portion 211 and the binding piece 2T, and the label sheet 34 extends to the front cover 31 and the back cover 32 to an extent that is not hidden by the space portion 42. Therefore, the name of the spacer file set 10S, etc. can be written on the label sheet 34, improving the identifiability and searchability of the spacer file set 10S.

In addition, according to this other embodiment, in a state where the paper sheets 1, etc. are normally bound to the binding device 2 (before being folded back approximately 360 degrees), a part (e.g., an upper part) of the tip portion 312, 322 on the other end side of the front cover 31 or back cover 32 that is not sandwiched between the holding portion 41 and the space portion 42 is formed longer than the tip portion 322, 312 on the other end side of the back cover 32 or front cover 31 that is sandwiched between the holding portion 41 and the space portion 42, so that when the other end side of the paper sheets 1 is opened approximately 360 degrees together with the front cover 31 and back cover 32 and folded back with the binding device 2 as a fulcrum, , the tip 322, 312 on the other end of the back cover 32 or front cover 31 is shortened relative to the tip 12 on the other end of the paper sheet 1, and a part of the tip 312, 322 on the other end of the front cover 31 or back cover 32 is slightly protruded, so that when returning the other end of the paper sheet 1 from the state in which it has been opened and folded back together with the front cover 31 and back cover 32 approximately 360 degrees to the state before it was folded back approximately 360 degrees, a finger can be hooked on the protruding part of the tip 312, 322 on the other end of the front cover 31 or back cover 32, and it can be easily returned to the state before it was folded back approximately 360 degrees. Therefore, the operability when returning to the state before it was folded back approximately 360 degrees can be improved.

<Modification>
It goes without saying that this embodiment can be modified within the scope of the present invention. For example, in this embodiment, the left and right binding pieces 2T (2Ta, 2Tb) are formed to have an approximately U-shaped cross section facing each other, and the depth d2 of the approximately U-shaped cross section bottom 2KTb at the base end 2LTb relative to the tip end 2STb of the other binding piece 2Tb connected to the other connecting portion 21b to which the spine 33 is not fixed is formed to be larger than the depth d1 of the approximately U-shaped cross section bottom 2KTa at the base end 2LTa relative to the tip end 2STa of one binding piece 2Ta connected to one connecting portion 21a to which the spine 33 is fixed, but this is not necessarily limited to this.

For example, the left and right binding pieces 2T (2Ta, 2Tb) may be formed with an approximately U-shaped cross section facing each other, and the depth d2 of the bottom 2KTb of the approximately U-shaped cross section at the base end 2LTb relative to the tip end 2STb of the other binding piece 2Tb connected to the other connecting part 21b to which the spine 33 is not fixed may be formed to be approximately the same as the depth d1 of the bottom 2KTa of the approximately U-shaped cross section at the base end 2LTa relative to the tip end 2STa of one binding piece 2Ta connected to one connecting part 21a to which the spine 33 is fixed.

In addition, multiple types of the other binding piece 2Tb with different depths d2 of the bottom 2KTb of the U-shaped cross section relative to the tip 2STb may be prepared and combined with one binding piece 2Ta connected to one connecting portion 21a to which the spine 33 is fixed, depending on the number of sheets of paper 1 to be bound. In this case, the same mold can be used to form one binding piece 2Ta and the connecting portion 21a, so that by simply increasing the number of molds to form the other binding piece 2Tb and the connecting portion 21b, binding devices 2 with different numbers of sheets of paper 1 to be bound can be easily manufactured at low cost.

For example, in the spacer member 4 according to this embodiment, the binding device 2 is fitted with a front cover 31 and a back cover 32 that protect the paper sheet 1 from both the front and back sides, the holding portions 41, 41D, 41E, and 41F are formed to be approximately the same size as the paper sheet 1 and are arranged on the back side of the front cover 31 or back cover 32, and the space portions 42, 42D, 42E, and 42F are formed to be approximately the same size as the area (area for writing or drawing) protruding outward from the binding device 2 of the paper sheet 1 that has been opened approximately 360 degrees and folded back, and are arranged on the front side of the front cover 31 or back cover 32. However, it is not necessarily necessary that the binding device 2 is fitted with the front cover 31 and/or back cover 32.

For example, in the case of a spacer member 4H having a holding portion 41H and a space portion 42H as shown in FIG. 23, the front cover 31 and the back cover 32 do not need to be attached to the binding device 2. That is, the holding portion 41H is formed to be approximately the same size as the paper sheet 1, and a locking hole 411H for inserting the binding piece 2T is formed at the widthwise inner end of the holding portion 41H. The widthwise inner end 42HN and the widthwise outer end 42HG of the space portion 42H are formed to be approximately the same size as the area (area for writing or drawing) protruding outward from the binding device 2 of the paper sheet 1 opened approximately 360 degrees and folded back, and the upper end 432H of the film material that wraps the core material of the space portion 42H is connected to the upper end 412H of the holding portion 41H, and the lower end 433H of the film material is connected to the lower end 414H of the holding portion 41H. Additionally, the widthwise outer end 42HG of the spacer 42H is formed near the widthwise outer end 41HG of the holding portion 41H. In this case, the above-mentioned spacer member 4H can be attached to the binding device 2 instead of the front cover 31 and/or back cover 32 that protect the paper sheets 1. Therefore, it is not necessarily required that the front cover 31 and back cover 32 are attached to the binding device 2.

The present invention can be attached to a file that can open and fold back paper sheets bound with a detachable binder approximately 360 degrees around the binder as a fulcrum, and can be used as a spacer member that closes the gaps caused by the binder when the paper sheets are opened approximately 360 degrees and folded back, and as a spacer file set with the spacer member attached.

REFERENCE SIGNS LIST 1 Paper sheets 2 Binding device 2T, 2Ta, 2Tb Binding strip 2GT, 2GTa, 2GTb Engagement portion 2KT, 2KTa, 2KTb Bottom portion 2LT, 2LTa, 2LTb Base end portion 2QTa, 2QTb Inclined portion 2ST, 2STa, 2STb Tip portion 4, 4A, 4B, 4C, 4D Spacer member 4E, 4F, 4H Spacer member 10 File 10S Spacer/file set 11 Binding hole 21, 21a, 21b Connecting portion 22, 22a, 22b Bearing portion 23 Rotation center shaft 24 Spring member 24N Compression torsion coil spring 31 Front cover 32 Back cover 33 Spine 33H Spine cover locking hole 34 Label sheet [0033] 41, 41D, 41E Holding portion 41DN, 41EN Width direction inner end portion 41DN1, 41DN2 Support piece 41EN1, 41EN2 Support piece 41F, 41H Holding portion 41FG Width direction outer end portion 41a, 41Ca Upper holding piece, holding piece 41b, 41Cb Lower holding piece, holding piece 42, 42D, 42E Space portion 42F, 42H Space portion 42DN, 42EN Width direction inner end portion 43 Cover material 211 Claw-shaped engaging portion 211P Base portion 211T Claw portion 221, 221a, 221b Cam surface 241, 242 End edge arm portion 31J, 32J Upper end portion 31K, 32K Lower end portion 312, 322 Tip portion 331 Large diameter portion 332 Small diameter portion 411A, 411C, 411D Locking hole 411E, 411F, 411G Locking hole 412, 412D, 412E Upper end portion 412G Upper end portion 413, 413B Parting line 414, , 414D, 414E Lower end portion 414G Lower end portion 421 Core material 421A Foam sheet 421B Cardboard sheet 432, 432D, 432E Upper end portion 432G Upper end portion 434F, 435F, 436F Width direction outer end portion CL Width direction center line α Opening angle W Gap

Claims (21)

A spacer member formed so as to be attachable to a file that includes a binding device having a binding piece formed so as to be detachable at a tip portion, and paper sheets bound to the binding piece, and that can open and fold back the paper sheets by approximately 360 degrees with the binding device as a fulcrum,
The spacer member includes a holding portion having a locking hole inserted through the binding piece and disposed adjacent to the paper sheets, and a plate-shaped space portion connected to the holding portion, and the space portion is disposed on the opposite side of the paper sheets before they are opened approximately 360 degrees outside the binding device and folded back, relative to the holding portion ,
The spacer member is characterized in that the space portion is formed to a size sufficient to close a gap between the paper sheets that are opened approximately 360 degrees and folded back by the binding device. 2. The spacer member according to claim 1,
A front cover and a back cover are attached to the binder to protect the paper sheets from both the front and back sides,
A spacer member characterized in that the holding portion is formed to be approximately the same size as the paper sheet and is positioned on the back side of the front cover or the back cover, and the space portion is formed to be approximately the same size as the area of the paper sheet that protrudes outwardly from the binding device when opened approximately 360 degrees and folded back, and is positioned on the front side of the front cover or the back cover. 3. The spacer member according to claim 2,
The space portion is made of a core material and a film material that wraps the core material, and is integrally formed at the top and bottom in the longitudinal direction of the binding tool,
A spacer member characterized in that an upper end of the film material is connected to an upper end of the holding portion at the position of the upper end of the front cover or the back cover, and a lower end of the film material is connected to a lower end of the holding portion at the position of the lower end of the front cover or the back cover. 4. The spacer member according to claim 3,
A spacer member characterized in that an upper end of the film material is folded over at the upper end of the front cover or the back cover and connected to the upper end of the holding portion, and a lower end of the film material is folded over at the lower end of the front cover or the back cover and connected to the lower end of the holding portion. 4. The spacer member according to claim 3,
A spacer member characterized in that an upper end of the film material is connected to an upper end of the holding portion protruding upward from the upper end of the front cover or the back cover, and a lower end of the film material is folded back at the lower end of the front cover or the back cover and connected to the lower end of the holding portion. 4. The spacer member according to claim 3,
A spacer member, characterized in that the holding portions are integrally formed above and below in the longitudinal direction of the binding device, and the locking holes are formed in the shape of elongated holes in the width direction of the binding device. 7. The spacer member according to claim 6,
A pair of support pieces are formed at the upper and lower parts of the holding part so as to protrude inward in the width direction of the binding tool, and the locking holes are formed in the support pieces, respectively.
A spacer member, characterized in that an inner end portion in the width direction of the holding portion is formed widthwise outward of an inner end portion in the width direction of the space portion in an area other than the two support pieces. The spacer member according to any one of claims 3 to 5,
A spacer member characterized in that the holding portion is divided into two upper and lower holding pieces in the longitudinal direction of the binding device, and the upper holding piece located at the top and the lower holding piece located at the bottom are each formed with the locking hole, and the locking hole is larger than the binding hole that binds the paper sheets to the binding piece. 9. The spacer member according to claim 8,
A spacer member, wherein a dividing line between said upper holding piece and said lower holding piece is formed in a wavy shape that curves upward and downward. 3. The spacer member according to claim 2,
A spacer member characterized in that the space portion is composed of a core material and a film material wrapping the core material, and the widthwise outer end portion of the film material is connected to the widthwise outer end portion of the holding portion so as to be bent in the width direction of the binding device. The spacer member according to any one of claims 3 to 10,
A spacer member, wherein the core material is made of a resin foam sheet or a resin cardboard sheet having a required thickness. A spacer file set having the spacer member according to any one of claims 2 to 11 attached thereto,
The binding device includes:
Left and right connecting portions that connect the base ends of the binding pieces at appropriate intervals in the longitudinal direction;
A plurality of bearing portions formed alternately in the longitudinal direction on the left and right connecting portions;
A rotation center shaft that is inserted through each of the bearing portions and extends in the longitudinal direction;
A spring member attached between the left and right connecting portions,
A spine connected to the front cover and the back cover is fixed to the rear side of the connecting portion on either the left or right side,
A spacer file set characterized in that, when the engagement between the tip ends of the binding pieces is released, the connecting portion to which the spine is fixed and the connecting portion to which the spine is not fixed are formed so as to be rotatable by the biasing force of the spring member to a state in which the opening angle between them with respect to the rotation center axis is approximately 80 to 100 degrees. 13. The spacer file set of claim 12,
the spring member is a compression torsion coil spring that is compressed in the longitudinal direction and mounted between the bearing portions that are alternately arranged in the longitudinal direction, and that is wound in a spiral shape around the outer circumferential side of the rotation central shaft,
A spacer file set characterized in that one end edge arm portion of the compression torsion coil spring urges one of the connecting portions to which the spine is fixed toward the rear side, and the other end edge arm portion of the compression torsion coil spring urges the other connecting portion to which the spine is not fixed, outward in the width direction. 14. The spacer file set of claim 13,
A cam surface is provided on each of the longitudinal end faces of the adjacent bearing portions, the cam surface being inclined with respect to the rotation central axis,
The cam surfaces are formed so as to be spaced apart from each other when the leading ends of the left and right binding pieces are in an engaged state, and to come into contact with each other when the leading ends of the left and right binding pieces are in a released state. 15. The spacer file set of claim 14,
A spacer file set, characterized in that the bearing portion having the cam surface is provided at least near an end portion in the longitudinal direction of the connecting portion. 16. The spacer file set according to any one of claims 12 to 15,
The base end portions of the left and right binding pieces are formed to be offset from each other in the longitudinal direction by a dimension equal to or greater than the plate width in the longitudinal direction,
A spacer file set characterized in that the left and right binding pieces have engaging portions at their tip ends which protrude inward in the width direction by a predetermined length from the tip side of the base end portion and engage with each other at an inclined portion which is inclined in the longitudinal direction from the position protruding inward in the width direction. 17. The spacer file set according to any one of claims 12 to 16,
The left and right binding pieces face each other and are formed into a substantially U-shaped cross section with different depths of the bottom relative to the tip,
A spacer file set, characterized in that the locking hole of the holding portion is inserted into the deep binding piece of the bottom portion. 18. The spacer file set according to any one of claims 12 to 17,
A spacer file set characterized in that the rotation center axis is positioned at a position eccentric to the other connecting part to which the spine is not fixed by a predetermined amount relative to the widthwise center line of one of the connecting parts to which the spine is fixed. 19. The spacer file set according to any one of claims 12 to 18,
A plurality of claw-shaped engaging portions are formed on the back side of one of the connecting portions, the claw portions being each formed wider than a base portion and projecting from a tip of the base portion toward the longitudinal center portion,
A spacer file set characterized in that the spine cover has a spine cover engagement hole having a large diameter portion through which the claw portion passes and a small diameter portion which is engaged with the base portion and clamped by the claw portion. 20. The spacer file set of claim 19,
A spacer file set characterized in that a label sheet is attached to the longitudinal center of the spine, avoiding the hook-shaped engaging portion and the binding piece, and the label sheet extends to the front cover and the back cover without being hidden by the space portion. 21. The spacer file set according to any one of claims 12 to 20,
a spacer file set characterized in that, when the paper sheets are normally bound in the binding device, a portion of the tip of the other end of the front cover or back cover that is not sandwiched between the retaining portion and the space portion is formed longer than the tip of the other end of the back cover or front cover that is sandwiched between the retaining portion and the space portion, and, when the other end of the paper sheets is opened and folded back together with the front and back covers approximately 360 degrees around the binding device as a fulcrum, the tip of the other end of the back cover or front cover is shortened relative to the tip of the other end of the paper sheets, and a portion of the tip of the other end of the front cover or back cover slightly protrudes.

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