JP6184801B2 - Double writing instrument - Google Patents

Description

  In the present invention, when one knock bar among a plurality of knock bars is slid forward, the tip writing part of the writing body connected to the knock bar protrudes from the tip end of the shaft tube so that writing can be performed. In this state, when the other knock bar is slid forward, the tip writing part of the writing body connected to the one knock bar is immersed in the tip end of the shaft tube and returns to the original position. The present invention relates to a double writing instrument formed so as to return.

2. Description of the Related Art Conventionally, there has been used a dual-type writing instrument that can perform writing with one selected from a plurality of writing bodies housed inside a shaft cylinder.
That is, in the conventional dual-type writing instrument, a rear shaft that forms the rear end side of the shaft cylinder is provided, and a plurality of guide slits are opened along the circumferential direction on the rear shaft. Each of these guide slits is provided with a guide rail that protrudes inward from each of both side edges in the longitudinal direction. A plurality of knock bars are provided corresponding to a plurality of pairs of guide rails facing each other, and one knock bar is slidably held between the pair of guide rails. Each knock bar is urged rearward of the shaft cylinder by a coil spring, and the rear end of the writing body is connected to the front end thereof.

  As a result, when one of the plurality of writing rods is slid toward the front of the shaft cylinder, the tip writing portion of the one connected to the knock rod is It is possible to write by protruding from the tip. In this state, when the other knock bar is slid toward the front of the shaft cylinder, the tip writing portion of the writing body connected to the one knock bar is immersed in the front end of the shaft cylinder. Then, it returns to the original position.

As a double-type writing instrument, a rotary cam for holding a knock bar at a position where the tip writing portion of the writing body protrudes from the tip end of the shaft tube is provided inside the rear shaft so as to be rotatable. (For example, refer to Patent Document 1).
In other words, in addition to the rotating cam, a coil spring that urges the rotating cam rearward is provided inside the rear shaft.
In order to convert the rotational force of the rotating cam into the rotational force of the rotating cam using the urging force of the coil spring, a front cam portion having irregularities formed on the leading edge is provided on the inner surface of the rear end of the rear shaft. A contact portion that meshes with the front cam portion is provided on the end surface.
Thus, when a rotational force in a predetermined direction is applied, the rotating cam rotates with this rotational force, and the coil spring is compressed by the engagement between the rotating cam contact portion and the front cam portion on the rear shaft side. It has become.
On the other hand, when the aforementioned rotational force is released, the contact portion of the rotating cam and the front cam portion on the rear shaft side engage with each other, thereby converting the elastic force of the compressed coil spring into rotational force, The rotating cam is reversed to the original rotation angle position.

As described above, the plurality of convex portions that lock the rear end portion of the knock bar when the corresponding knock bar moves forward are projected from the outer peripheral surface of the rotating cam side by side in the circumferential direction.
When the knock bar is advanced forward, the rotating cam is pushed back by the knock bar, and the entire rotary cam rotates to compress the coil spring. And if a knock stick passes the side of a convex part and reaches the front end position of a convex part, a convex part will be released from press of a knock stick. Then, the elastic force of the compressed coil spring is converted into a rotational force by the abutting portion of the rotating cam and the front cam portion on the rear shaft side, and the rotating cam returns to the original position, and the rear end portion of the knock bar that has advanced The protrusion is locked. Thereby, the writing body is fixed in a state in which the tip writing portion projects from the tip end of the shaft cylinder.

JP 2013-82204 A

In the above-described dual writing instrument, the internal diameter of the rear shaft is measured in order to confirm the quality inside the rear shaft. In this dimension measurement, a measuring instrument such as a pin cage is generally inserted into the rear shaft to measure the inner diameter of the rear shaft.
Here, when measuring the dimensions, the measuring tool may fall into the rear shaft, and the rear end inner surface of the rear shaft is damaged due to the dropping of the measuring tool, resulting in a design or functional defect. May be caused.
Specifically, when a transparent decorative portion is provided at the rear end of the rear shaft, the decorative portion at the rear end of the rear shaft is damaged and the appearance of the decorative portion is impaired due to the fall of the measuring tool.
Further, when the front cam portion is provided on the inner surface of the rear end of the rear shaft, the front cam portion is deformed due to the dropping of the measuring tool, which hinders the movement of the tip writing portion.
For this reason, there is a desire to prevent damage to the rear shaft when performing dimension measurement.

In addition, when performing printing such as painting or transfer on the surface of the rear shaft, a rod-shaped mandrel is inserted into the rear shaft so that the surface of the rear shaft does not escape backward. With this, painting or printing is performed while pressing the surface of the rear shaft from the inside.
Here, when the mandrel reaches the rear end of the rear shaft when the mandrel is inserted into the rear shaft, the inner surface of the rear end of the rear shaft is damaged, resulting in a design or functional defect. May cause it.
For this reason, there is a desire to prevent damage to the rear axle even when painting or printing.

  Therefore, the present invention has been made in view of the above-described problems of the prior art, and its purpose is to prevent damage to the rear shaft when performing dimension measurement, painting, or printing. Is to provide a double writing instrument.

The present invention has been made to achieve the aforementioned object. The features of the present invention will be described below using the embodiments of the present invention shown in the drawings.
In addition, a code | symbol shows the code | symbol used in embodiment of this invention, and does not limit the technical scope of this invention.

(First invention)
(Feature point)
The first aspect of the present invention is characterized by the following points.
That is, this 1st invention has the rear axis | shaft (5) which forms the rear-end side of the axial cylinder (3) which accommodates several writing bodies (2), and is open to the surrounding surface of the said rear axis | shaft (5). In addition, a plurality of guide slits (32) extending along the axial direction of the rear shaft (5) are juxtaposed along the circumferential direction of the rear shaft (5), and the inner periphery of the rear shaft (5) A plurality of pairs of guide rails (33) projecting radially inward from a portion along the longitudinal side edge of the guide slit (32) on the surface are provided, and the pair of guide rails (33) is a pair of the guide rails (33). A plurality of knock bars (10) that are slidable along the axial direction of the rear shaft (5) by being respectively guided by the guide rails (33) forming the plurality of knock bars (10) ) Are connected to the rear end portions of the plurality of writing bodies (2), respectively, and one knock rod (10) of the plurality of knock rods (10) is connected to the front of the shaft tube (3). When it is slid toward the end, the tip writing part (2A) of the writing body (2) connected to the knock bar (10) protrudes from the tip opening (4B) of the shaft tube (3) and the writing is made. When the other knock bar (10) is slid toward the front of the shaft tube (3), the cursive body (2) connected to the one knock bar (10) is formed. The tip writing part (2A) is a compound writing instrument (1) formed so as to be immersed in the tip opening (4B) of the shaft tube (3) and to return to the original position. A rib (35) that protrudes radially inward from a portion of the inner peripheral surface of the shaft (5) where the guide slit (32) is not formed and extends along the axial direction of the rear shaft (5) is formed. The rib tip side portion (36) on the tip side of the rib (35) has an inner inner edge in the radial direction of the rear shaft (5) positioned outside the inner edge of the guide rail (33), In (35) The rib rear end side portion (37) on the end side has an inner inner edge in the radial direction of the rear shaft (5) located inside the inner edge of the guide rail (33), and the rib front end side portion (36) And the rib rear end side portion (37) is provided with a step portion (38) protruding from the rib front end side portion (36) to the rib rear end side portion (37), and the step portion (38) is characterized in that it is located in front of the rear shaft (5) with respect to the rear end inner surface (5D) formed at the rear end of the rear shaft (5).

(Second invention)
(Feature point)
The second invention of the present invention has the following characteristic points in the first invention described above.
That is, the second aspect of the present invention is the rear end portion of the clip portion (8) capable of sandwiching a sheet-like member between the rear end portion of the rear shaft (5) and the outer peripheral surface of the rear shaft (5). The clip portion (8) is provided on the rear shaft (5) so that its longitudinal direction is along the rib (35).

(Third invention)
(Feature point)
The third invention of the present invention has the following characteristic points in the first or second invention described above.
That is, the third aspect of the invention includes a rotating cam (40) arranged to be rotatable in the rear shaft (5) and reciprocating along the axial direction, and a rear end of the rear shaft (5). And a plurality of cam biasing means (43) for biasing the rotating cam (40) toward the rear end of the rear shaft (5). A knock bar urging means (2C) is provided inside the rear shaft (5), and on the outer peripheral surface of the rotary cam (40), when the corresponding knock bar (10) is advanced forward A plurality of convex portions (44) having a locking portion (46) for locking the rear end portion thereof are juxtaposed in the circumferential direction, and the protruding portion (44) is slid on the knock bar (10). An inclined surface (41) inclined with respect to the moving direction is provided, and the knock bar (10) is provided with an engaging portion (16) that engages with the inclined surface (41), and the rear shaft (5 ) Of the rear end inner surface (5D) of the front cam portion (39) having an unevenness at the tip edge A contact portion (45) that meshes with the front cam portion (39) is provided on a rear end surface of the rotary cam (40), and the knock rod (10) is forward of the rotary cam (40). Forwardly, the inclined surface (41) formed on the convex portion (44) is pressed by the engaging portion (16) and rotates, and the abutting portion (45) is brought into contact with the front cam portion (39). ) Is guided to advance against the urging force of the knock bar urging means (2C), and the engaging portion (16) further advances to the side of the convex portion (44). When passing the direction, the biasing force of the cam biasing means (43) is retracted to the original axial position, and the abutting portion (45) is guided to the front cam portion (39), and the original Inverted to the rotational angle position, formed so that the rear end of the knock bar (10) can be locked, the stepped portion (38) of the rib (35), the front cam portion ( 39) before the front edge It is located in front of the rear shaft (5).

(Effect of the first invention)
The present invention configured as described above has the following effects.
That is, according to the first aspect of the present invention, the rib that protrudes inward in the radial direction and extends along the axial direction of the rear shaft is formed at a portion where the guide slit is not formed on the inner peripheral surface of the rear shaft. The rib has a step portion protruding from the rib front end side portion to the rib rear end side portion at the boundary portion between the rib front end side portion and the rib rear end side portion. Because it is ahead of the inner surface of the rear end formed at the rear end, even if the measuring tool falls into the rear shaft during dimension measurement, the falling measuring tool is locked to the stepped portion and reaches the inner surface of the rear end. In addition, even if the mandrel is inserted into the rear shaft during painting or printing, the mandrel is not locked to the stepped portion and reaches the inner surface of the rear end. Alternatively, when printing, the rear shaft is prevented from being damaged, thereby achieving the object. It is possible.

(Effect of the second invention)
According to the second invention of the present invention, in addition to the effects of the first invention described above, the following effects can be achieved.
That is, according to the second invention, the rear end portion of the clip portion is coupled to the rear end portion of the rear shaft, and a sheet-like object can be sandwiched between the clip portion and the outer peripheral surface of the rear shaft. Since the longitudinal direction of the clip part is along the rib, even if stress is generated inside the rear side wall by moving the tip part of the clip part away from the outer peripheral surface of the rear axis, the generated stress is And is not concentrated in one place. For this reason, even if the operation of sandwiching the sheet-like object at the clip portion is repeated many times, the rear shaft does not break, thereby preventing the rear shaft from being damaged.

(Effect of the third invention)
According to the third aspect of the present invention, in addition to the effects of the first or second aspect described above, the following effects can be achieved.
That is, when one knock bar is moved forward and the tip writing part of the writing body connected to the knock bar is protruded from the tip end of the shaft cylinder, the one knock bar is moved by the operation of the rotary cam. The rod is locked to the rotating cam, and the state where the tip writing part protrudes from the tip end of the shaft cylinder is maintained.
On the other hand, when the other knock bar is operated forward, the locking of the one knock bar by the rotating cam is released, and the one knock bar is restored to the original axis by the biasing force of the corresponding knock bar biasing means. The tip writing portion of the cursive body which has been retracted to the directional position and is protruding is immersed in the tip mouth, and the tip writing portion of the cursive body is accommodated inside the shaft tube.
Here, according to the third invention, even if the measuring tool falls into the rear shaft during the dimension measurement, the falling measuring tool is locked to the stepped portion and does not reach the inner surface of the rear end. Even when the mandrel is inserted into the rear shaft during printing or printing, the mandrel is locked to the stepped portion and does not reach the inner surface of the rear end. In addition, since the front cam part provided on the inner surface of the rear end is not deformed, it is possible to prevent the occurrence of problems such as troubles in the taking in / out operation of the front writing part. can do.

It is a double view which shows one Embodiment of this invention. It is sectional drawing which shows the writing instrument which concerns on the said embodiment. It is a perspective view which shows the spacer which concerns on the said embodiment. FIG. 4 is a view taken along line IV in FIG. 3. It is sectional drawing of the front-end | tip writing part exposure state which shows the writing instrument which concerns on the said embodiment. It is sectional drawing which shows the rear axis | shaft which concerns on the said embodiment. It is a VII line arrow directional view in FIG. It is the VIII-VIII sectional view taken on the line in FIG. It is the IX-IX sectional view taken on the line in FIG. It is a four-sided view showing the first knock bar according to the embodiment. It is a four-sided view showing a second knock bar according to the embodiment. It is an expanded sectional view which shows the principal part of the said embodiment. It is a perspective view which shows the rotating cam which concerns on the said embodiment. It is a trihedral view showing the rotating cam according to the embodiment. It is an expanded sectional view which shows the state from which the principal part shown in FIG. 12 differs. It is a perspective view which shows the clip concerning the said embodiment. It is a side view of the decomposition | disassembly state which shows the clip concerning the said embodiment. It is a perspective view which shows the edge part member which concerns on the said embodiment. It is the XIX-XIX sectional view taken on the line in FIG. It is a perspective view which shows the modification of this invention. It is a perspective view which shows another modification of this invention. It is a perspective view which shows the modification shown in FIG. 21 from the other side.

Below, ballpoint pen 1 concerning one embodiment which is a form for carrying out the present invention is explained, referring to drawings.
(Schematic configuration of the ballpoint pen 1)
The ballpoint pen 1 according to the present embodiment is a dual-type writing instrument in which a ballpoint refill 2 of, for example, black, red, and blue is accommodated in a shaft tube 3 as a writing body.
In the present embodiment, the tip of the ballpoint pen 1 refers to the end where the writing ball of the ballpoint pen refill 2 is located during writing, and the rear end refers to the end opposite to the “tip”. . Moreover, the front in the ball-point pen 1 refers to the direction approaching the tip, and the rear refers to the direction approaching the rear end.

1A and 1B are a plan view and a side view of the ballpoint pen 1, respectively. In FIG. 1, the ballpoint pen 1 includes a shaft cylinder 3 that accommodates three ballpoint pen refills 2. The shaft cylinder 3 is a cylindrical member having a hollow inside, a tapered tip, and a flat rear end.
The shaft cylinder 3 includes a front shaft 4 that forms the front end side, a rear shaft 5 that forms the rear end side, a middle shaft 6 that forms a surface between the front shaft 4 and the rear shaft 5, and a rear shaft 5. It can be disassembled into a crown 7 which is an end member attached to the rear end.

As shown in FIG. 2, the front shaft 4 has a tapered conical tip portion 4A, and the rear end side of the tip portion 4A is formed in a straight cylindrical shape. In addition, a tip opening 4B is opened at the tip of the conical tip portion 4A.
Each of the three ball-point pen refills 2 housed in the shaft tube 3 is provided with a ball-point pen tip 2A as a tip writing portion at the tip portion. Of the three ballpoint pen refills 2, any one ballpoint pen tip 2A can project outside through the tip 4B.
Further, a female screw portion 4C is formed in the vicinity of the rear end on the inner peripheral surface of the front shaft 4.

The rear shaft 5 is provided with an operating portion 5A in which three knock bars 10 for projecting the ballpoint pen tip 2A from the tip end 4B are slidable, and the front shaft 4 passes through the inside of the middle shaft 6 from the operating portion 5A. A core portion 5B extending to the vicinity of the rear end is provided.
Among these, the rear end portion of the clip portion 8 for sandwiching a sheet-like object is coupled to the operation portion 5A which is the rear end portion of the rear shaft 5 between the outer peripheral surface of the rear shaft 5.

Here, the middle shaft 6 is a cylindrical member that has a side wall with a constant thickness and extends entirely straight.
On the other hand, the rear shaft 5 has a stepped peripheral surface in which the outer diameter of the core portion 5B is smaller than that of the operation portion 5A, and a step is formed at the boundary portion between the core portion 5B and the operation portion 5A. .
The step between the operation portion 5A and the core portion 5B has a dimension corresponding to the thickness of the side wall portion of the center shaft 6. Thereby, when the middle shaft 6 with the core portion 5B inserted therein is connected to the operation portion 5A, the outer peripheral surface of the middle shaft 6 and the outer peripheral surface of the operation portion 5A form a continuous surface, As a result, the three outer peripheral surfaces of the front shaft 4, the middle shaft 6 and the rear shaft 5 form one continuous surface.
A female screw portion 5C is formed in the vicinity of the tip of the inner peripheral surface of the core portion 5B.

Inside the boundary portion between the front shaft 4 and the middle shaft 6, an intermediate screw tube 9 that connects the front shaft 4 and the core portion 5 </ b> B of the rear shaft 5 is provided.
The middle screw tube 9 is a cylindrical member as a whole. A male screw portion 9A that is screwed with the female screw portion 4C of the front shaft 4 is formed at the end of the middle screw tube 9 on the front shaft 4 side. A male screw portion 9B that is screwed into the female screw portion 5C of the rear shaft 5 is formed at the end of the middle screw tube 9 on the rear shaft 5 side.
The front shaft 4 and the rear shaft 5 are formed by screwing the male screw portion 9A of the middle screw tube 9 with the female screw portion 4C of the front shaft 4 and the male screw portion 9B of the middle screw tube 9 as the female screw portion of the rear shaft 5. By being screwed to 5C, they are connected to each other.

In the above, between the rear end portion of the ballpoint pen refill 2 and the front end portion of the knock bar 10, the rod-shaped refill tail plug 2B for connecting both is provided.
A spacer 20 for guiding the refill tail plug 2B along the axial direction of the rear shaft 5 is provided inside the rear shaft 5.

  The rear end portions of the three ballpoint pen refills 2 are inserted into the spacer 20, the refill guide portion 21 for guiding the rear end portions, and the refill tail plug 2 </ b> B inserted into the coil spring 2 </ b> C. 2 is provided with a tail plug holding portion 22 for holding the cam shaft movably along the axial direction of the rear shaft 5 and a projection 27 to which a cam shaft support shaft 31 disposed on the right side in FIG.

Here, as shown in FIG. 3, the spacer 20 has a cylindrical portion 23 formed in a cylindrical shape on the tip side (left side in FIG. 3). As shown in FIG. 4, the refill guide portion 21 is a substantially cross-shaped hole formed inside the cylindrical portion 23.
Of the four arms in the substantially cross shape of the refill guide portion 21, the rear ends of the three ball-point pen refills 2 are inserted into the three arms located in the upper, right, and lower positions in FIG. Refill insertion part 24 is provided.

  Returning to FIG. 2, the refill tail plug 2B has an outer diameter smaller than the inner diameter of the coil spring 2C as shown in FIG. 2, and a cylindrical portion 2D inserted into the coil spring 2C, and the cylindrical portion 2D. It has a flange portion 2E that protrudes in the radial direction from the rear end portion and has an outer diameter larger than the inner diameter of the coil spring 2C.

On the outer peripheral surface on the rear end side of the spacer 20, as shown in FIG. 3, four U-shaped grooves 25 opened radially outward are arranged in parallel in the circumferential direction at intervals of 90 degrees. As shown in FIG. 4, two large and small round holes 26 and 27 are opened in the partition wall 21A that partitions the refill guide portion 21 and the four U-shaped grooves 25. Among these, the larger three round holes 26 are tail plug insertion holes 28 into which the cylindrical portion 2D of the refill tail plug 2B can be inserted.
Of the four U-shaped grooves 25 described above, the three U-shaped grooves 25 communicating with the refill insertion portion 24 of the refill guide portion 21 via the tail plug insertion hole 28 are tails for holding the refill tail plug 2B. A stopper holding portion 22 is provided.
The inner diameter of the tail plug insertion hole 28 is larger than the outer diameter of the cylindrical portion 2D of the refill tail plug 2B, but smaller than the outer diameter of the coil spring 2C.

In other words, the cylindrical portion 2D of the refill tail plug 2B can enter the refill guide portion 21 from the tail plug holding portion 22 through the tail plug insertion hole 28.
On the other hand, the coil spring 2C cannot pass through the tail plug insertion hole 28 as shown in FIG. 2, and is compressed between the collar portion 2E of the refill tail plug 2B and the partition wall portion 21A to hold the tail plug. The part 22 is housed inside.
Such a coil spring 2C presses the flange 2E of the refill tail plug 2B rearward by its elastic force, and consequently presses the knock bar 10 toward the rear end of the rear shaft 5. In the above, the coil spring 2C is a knock bar biasing means for biasing the knock bar 10 toward the rear end of the rear shaft 5.

Here, when the knock bar 10 is operated forward, the ballpoint pen 1 is pressed by the knock bar 10 as shown in FIG. 5 so that the refill tail plug 2B moves forward and moves to the collar 2E of the refill tail plug 2B. While compressing the coil spring 2C, the ball-point pen tip 2A of the ball-point pen refill 2 protrudes from the tip end 4B to the outside.
In other words, the ball-point pen 1 has a ball-point pen tip of the ball-point refill 2 connected to the knock bar 10 when one of the three knock bars 10 is slid toward the front of the shaft 3. 2A is formed so as to protrude from the front end opening 4B of the shaft tube 3 so that writing can be performed.
When the knock bar 10 is operated forward, the coil spring 2C is further compressed between the collar 2E of the refill tail plug 2B and the partition wall 21A, and the elastic force that returns the knock bar 10 to the original position. Is to generate.

  Returning to FIG. 1, a plurality of guide slits 32 that extend along the axial direction of the rear shaft 5 are opened on the peripheral surface of the operation portion 5 </ b> A of the rear shaft 5 as shown in FIG. 1. . These guide slits 32 are provided in three places according to the number of ballpoint pen refills 2 and are arranged in parallel at intervals of 90 degrees along the circumferential direction of the rear shaft 5.

As shown in FIGS. 6 to 9, a pair of guide rails 33 projecting radially inward from a portion along the longitudinal side edge of the guide slit 32 is provided on the inner peripheral surface of the rear shaft 5. The number of guide rails 33 corresponding to the guide slits 32 is provided. In particular. Three pairs of guide rails 33 are provided on the entire rear shaft 5 corresponding to the three guide slits 32.
Although none of the three knock bars 10 are shown in FIGS. 6 to 9, each of the three knock bars 10 is between a pair of guide rails 33 among a plurality of pairs of guide rails 33. And are slidable along the axial direction of the rear shaft 5 by being guided by the pair of guide rails 33.
As shown in FIG. 7, guides extending along the axial direction of the rear shaft 5 are provided at the portions of the pair of guide rails 33 facing each other, as shown in FIG. Each groove 33B is formed.

A rib 34 protruding radially inward from the portion 34 is formed at a portion 34 where the guide slit 32 is not formed on the inner peripheral surface of the rear shaft 5. The rib 35 extends along the axial direction of the rear shaft 5 and has substantially the same overall length as the guide slit 32.
As shown in FIG. 8, the inner end edge 36A in the radial direction of the rear shaft 5 is more than the inner edge 33A of the guide rail 33, as shown in FIG. Located on the outside.
As shown in FIG. 9, the rib rear end side portion 37, which is a portion on the rear end side (right side in FIG. 6) of the rib 35, has an inner inner edge 37 </ b> A in the radial direction of the rear shaft 5. Is located on the inside.

As shown in FIG. 6, a step portion 38 protruding from the rib front end side portion 36 to the rib rear end side portion 37 is provided at the boundary portion between the rib front end side portion 36 and the rib rear end side portion 37. The step portion 38 is located in front of the rear shaft 5 with respect to the rear end inner surface 5D formed at the rear end portion of the rear shaft 5.
Here, the rear end inner surface 5D is provided at the rear end of the rear shaft 5 and is a surface facing the front of the rear shaft 5.
As shown in FIGS. 6 and 7, the rear end inner surface 5 </ b> D is provided with a front cam portion 39 having an unevenness at the front end edge.
Here, the front cam portion 39 has a circular front shape extending along the periphery of the rear end inner surface 5D as shown in FIG.
Further, as shown in FIG. 6, the front cam portion 39 is provided with an inverted V-shaped peak portion 39A and a V-shaped valley portion 39B as irregularities.
Here, the stepped portion 38 of the rib 35 is located in front of the rear shaft 5 with respect to the front end edge of the front cam portion 39, that is, the top of the inverted V-shaped peak portion 39A.
Returning to FIG. 5, as shown in FIG. 5, the clip portion 8 is provided on the rear shaft 5 so that the longitudinal direction thereof is along the rib.

As shown in FIG. 5, the knock bar 10 is a bar-like member extending along the axial direction of the rear shaft 5. As such a knock bar 10, two types of a first knock bar 10A and a second knock bar 10B are provided.
As shown in FIG. 8, the first knock bar 10A is arranged in a guide slit 32A located on the left side in FIG. On the other hand, the second knock bar 10B is disposed in the guide slit 32B located on the lower side and the right side in FIG.

FIGS. 10A to 10D are a front view, a side view, a rear view, and a bottom view of the first knock bar 10A. As shown in FIG. 10, guided ridges 11 projecting laterally in the vicinity of the rear end thereof are provided on the side surfaces of both sides of the first knock bar 10A.
These guided ridges 11 are guided by the aforementioned guide grooves 33B provided on the guide rails 33, extend in the axial direction of the rear shaft 5, and have a thickness that is the width of the guide grooves 33B. It corresponds to.

The first knock bar 10A is provided with a rear end surface 12 facing the rear end inner surface 5D of the rear shaft 5 and an exposed side surface 13 exposed to the outside from the guide slit 32.
A connecting portion 14 is provided at the tip of the first knock bar 10A so as to protrude downward from the lower surface in FIG. The first knock bar 10A is connected to the rear end of the refill tail plug 2B at the front end surface of the connecting portion 14.

In the vicinity of the tip of the exposed side surface 13, an identification groove 13A for identifying the first knock bar 10A from the second knock bar 10B is provided.
At the rear end of the first knock bar 10A, there is provided a finger hook 15 that bulges the exposed side surface 13 upward in FIG. The finger hooking portion 15 locks the user's finger so that the user can easily slide the first knock bar 10A toward the front of the shaft tube 3.

Further, an engaging portion 16 is provided at the rear end of the first knock bar 10A so as to protrude downward from the lower surface in FIG.
As shown in FIG. 10 (D), the engaging portion 16 of the first knock bar 10A faces diagonally to the left in FIG. 10 (D) in order to correspond to an inclined surface 41A of the rotating cam 40 described later. It has an inclined surface 16A.

On the rear end surface 12 of the first knock bar 10A, as shown in FIG. 10B, an abutting protrusion 17 is provided that protrudes toward the rear end inner surface 5D of the rear shaft 5.
Further, the rear end surface 12 of the first knock bar 10A is provided with a surface protrusion 18 that extends the exposed side surface 13 rearward and spaced from the contact protrusion 17.

FIGS. 11A to 11D are a front view, a side view, a rear view, and a bottom view of the second knock bar 10B. As shown in FIG. 11, the second knock bar 10A has the same guided ridge 11, rear end face 12, exposed side face 13, connection part 14, finger hook part 15, engaging part 16, as the first knock bar 10A. The contact protrusion 17 and the surface protrusion 18 are provided.
The second knock bar 10A differs from the first knock bar 10A in the following two points.
(1) The second knock bar 10A is not provided with an identification groove 13A.
(2) The engaging portion 16 of the second knock bar 10B is different from the first knock bar 10A in order to correspond to an inclined surface 41B of the rotating cam 40, which will be described later. A point having an inclined surface 16B.

When the knock bar 10 as described above is slid rearward along the longitudinal direction of the guide slit 32, as shown in FIG. 12, the position where the rear end of the contact protrusion 17 contacts the rear end inner surface 5D. It is possible to slide up to. Thus, in the state where the contact protrusion 17 is in contact with the rear end inner surface 5D, a gap G is formed between the exposed side surface 13 and the rear end edge of the guide slit 32 as shown in FIG. It has become.
Here, the surface protrusion 18 extends rearward from the rear end of the contact protrusion 17 and the knock bar 10 is moved to a position where the rear end of the contact protrusion 17 contacts the rear inner surface 5D. When slid rearward, a gap G is formed between the rear end of the surface protrusion 18 and the rear end edge of the guide slit 32.
Further, the rear end inner surface 5D of the rear shaft 5 is provided with a rising portion 5E protruding from the outer peripheral edge in the radial direction toward the knock bar 10.
The rising portion 5E is sandwiched between the contact projection 17 and the surface projection 18 in a state where the knock rod 10 is disposed at a position where the contact projection 17 on the knock rod 10 side contacts the rear end inner surface 5D. It is formed to be.

Returning to FIG. 2, as shown in FIG. 2, a rotating cam 40 is provided in the rear shaft 5 so as to be rotatable inside the rear shaft 5 and reciprocally movable along the axial direction. It has been.
That is, a fitting recess 31A for fitting the projection 27 of the tail plug holding portion 22 inside is provided at the tip of the cam shaft support shaft 31.
A bearing hole 5F that supports the rear end side of the camshaft support shaft 31 is provided in the central portion of the rear end inner surface 5D of the rear shaft 5.

The rotary cam 40 is provided with a shaft insertion hole 42 that passes through the rotary cam 40 along the axial direction of the rear shaft 5.
The cam shaft 31 has a front end portion supported by the spacer 20 and a rear end portion of the bearing hole 5F on the rear shaft 5 side by fitting the fitting recess 31A of the front end portion with the protrusion 27 on the spacer 20 side. And is supported by the rear shaft 5.
Such a cam shaft support shaft 31 is inserted through the shaft insertion hole 42 of the rotary cam 40 at an intermediate portion thereof, and rotatably supports the rotary cam 40.
A coil spring 43 serving as a cam urging means for urging the rotating cam 40 toward the rear end of the rear shaft 5 is wound around the vicinity of the front end portion of the cam shaft support shaft 31.

FIG. 13 is a perspective view of the rotating cam 40, and FIGS. 14A to 14C are a front view, a side view, and a rear view of the rotating cam 40. FIG.
As shown in FIGS. 13 and 14, the rotating cam 40 is formed with three convex portions 44 that protrude radially outward from the outer peripheral surface of the cylindrical main body 40A. These convex portions 44 are juxtaposed in the circumferential direction on the outer peripheral surface of the main body 40A of the rotating cam 40.

Here, of the three convex portions 44, the convex portion 44 located on the right side in FIG. 14C is a first convex portion 44A corresponding to the first knock bar 10A, and FIG. The remaining convex portions 44 located on the upper side and the left side in C) are second convex portions 44B corresponding to the second knock bar 10B.
As shown in FIG. 13, the first convex portion 44A is inclined corresponding to the inclined surface 16A of the engaging portion 16 formed on the first knock rod 10A which is the corresponding knock rod 10, and An inclined surface 41A that engages with the inclined surface 16A is provided.
The second convex portion 44B is inclined corresponding to the inclined surface 16B of the engaging portion 16 formed on the second knock rod 10B which is the corresponding knock rod 10, and is engaged with the inclined surface 16B. An inclined surface 41B is provided.

As shown in FIGS. 13 and 14B, a contact portion 45 that meshes with the front cam portion 39 on the rear shaft 5 side is provided on the rear end surface of the rotating cam 40.
In other words, the abutting portion 45 has a V-shaped valley portion 45A corresponding to the inverted V-shaped peak portion 39A on the front cam portion 39 side and a reverse V corresponding to the V-shaped valley portion 39B on the front cam portion 39 side. It is equipped with a letter-shaped peak 45B.

Further, when the corresponding knock bar 10 advances forward, the engaging part 16 provided at the rear end part of the knock bar 10 is locked to the tip of the convex part 44 as shown in FIG. A locking portion 46 is provided.
Here, the abutting protrusion 17 provided at the rear end portion of the knock bar 10 is in a state where the engaging portion 16 is locked to the locking portion 46 of the convex portion 44 protruding from the rotating cam 40. The protective projection protrudes rearward from the locking portion 46.

  In the above, when the knock bar 10 advances forward, the rotating cam 40 is pressed against the engaging portion 16 of the knock bar 10 by the inclined surface 41 formed on the convex portion 44, whereby the rotary cam 40 itself rotates. At the same time, the abutting portion 45 is guided by the front cam portion 39 on the rear shaft 5 side so as to move forward against the urging force of the coil spring 43.

  Further, when the engaging portion 16 of the knock bar 10 further advances and passes by the side of the convex portion 44, the rotating cam 40 is moved to the original axial position by the biasing force of the coil spring 43. While retreating, the abutting portion 45 is guided by the front cam portion 39 so as to be reversed to the original rotational angle position.

Further, the rotating cam 40 is reversed to the original rotation angle position, in other words, to the position where the engaging portion 16 of the knock bar 10 can be locked. As a result, as shown in FIG. 16 is formed to be locked. In this state, the ball-point pen tip 2A of the ball-point pen refill 2 connected to the knock bar 10 protrudes from the tip end 4B of the front shaft 4 to the outside.
Further, in this state, when the other knocking rod 10 not shown in FIG. 15 is slid toward the front of the shaft tube 3, the rotating cam 40 is rotated again, and the engaging portion formed by the locking portion 46. The ball-point pen tip 2A of the ball-point pen refill 2 released from the locking 16 and connected to the knock bar 10 shown in FIG. 15 is immersed in the tip end 4B of the front shaft 4 by the urging force of the coil spring 2C. Then, it is formed to return to the original position.

As shown in FIGS. 16 and 17, the clip portion 8 is a clip body portion 81 for sandwiching a sheet-like object between the outer peripheral surface of the rear shaft 5 and a clip for decorating the ballpoint pen 1. The decorative portion 82 is combined.
The clip body 81 includes a sandwiching portion 81A for sandwiching a sheet-like member between the outer periphery of the rear shaft 5 and a ring-shaped fixed ring portion 81B that is fixed to the rear shaft 5. ing.
The clip decoration portion 82 includes a decoration portion 82A that imitates a jewel with a transparent synthetic resin, and a ring-shaped fixed ring portion 82B that is fixed to the rear shaft 5.

Here, referring back to FIG. 12, the rear end portion 5G of the rear shaft 5 is provided with a cylindrical fixing portion 5H protruding rearward from the rear end portion 5G as shown in FIG. A male screw portion 5J is formed on the outer peripheral surface of the fixed portion 5H. A ceiling screw tube 83 having an inner peripheral surface formed with a female screw is screwed into the male screw portion 5J.
The clip portion 8 has the fixed portion 5H inserted through the fixed ring portions 81B and 82B, and the fixed ring portions 81B and 82B are sandwiched between the rear end portion 5G of the rear shaft 5 and the top screw tube 83. In this state, the top screw tube 83 is screwed into the male screw portion 5J, thereby being fixed to the rear shaft 5.

As shown in FIG. 12, the crown 7 is an end member that closes the rear end opening of the shaft tube 3, specifically, the opening 5L formed in the end surface 5K of the fixed portion 5H. The crown 7 is manufactured by injection molding. As shown in FIGS. 18 and 19, the crown 7 is a cap-shaped member that is formed in a hollow truncated cone shape and has an open bottom surface.
A stepped hole 73 having a stepped surface 72 formed therein is formed in the rear end surface 71 located behind the shaft cylinder 3 of the crown 7 while penetrating through the central portion thereof.

In addition, decorative grooves 74 </ b> A to 74 </ b> C are formed on the outer peripheral surface of the crown 7 so as to correspond to the positions of the three ballpoint pen refills 2 housed in the shaft tube 3.
The interiors of the decorative grooves 74A to 74C are each painted with a paint having the same color as the writing color of the corresponding ballpoint pen refill 2.
Of the edge portion 7A surrounding the bottom opening of the crown 7, the edge portion is located at the upper position in FIG. 18 in order to avoid interference with the fixed ring portions 81B and 82B of the clip portion 8. An escape portion 75A having a “]” shape, in which 75 is partially cut away, is provided.

Here, when the crown 7 is manufactured by injection molding, a mold (not shown) having a gate 76 opened in the center of the back of the “]” character in the escape portion 75 A is used and melted inside the mold. It is manufactured by injecting resin.
Therefore, a weld mark is formed in a portion 77 facing the gate 76 on the outer peripheral surface of the crown 7. A decorative groove 74B is provided in the portion 77 where the weld mark is formed.
On the inner peripheral surface that is the back side of the decorative grooves 74A to 74C of the crown 7, a bulging portion 75B in which the inner peripheral surface is bulged inward in order to ensure the thickness of the portion where the decorative grooves 74A to 74C are formed. Is formed.

Returning to FIG. 12, a cap member 78 having a collar portion 78A formed at the rear end is inserted into the stepped hole 73 of the crown 7 as shown in FIG. The cap member 78 has an open front end portion into which the rear end portion 31B of the cam shaft 31 is tightly fitted.
The crown 7 is inserted into the stepped hole 73 and the flange portion 78A of the cap member 78 that is tightly fitted to the rear end portion 31B of the camshaft support shaft 31 forms the stepped surface 72 of the stepped hole 73. By fixing, the rear shaft 5 is fixed to the rear end.

(Effect of embodiment)
According to this embodiment as described above, the following effects can be obtained.
That is, a rib 35 that protrudes inward in the radial direction and extends along the axial direction of the rear shaft 5 is formed in a portion 34 on the inner peripheral surface of the rear shaft 5 where the guide slit 32 is not formed. A stepped portion 38 projecting from the rib leading end side portion 36 to the rib trailing end side portion 37 is provided at the boundary portion between the rib leading end side portion 36 and the rib trailing end side portion 37, and the position of the stepped portion 38 is Since the front end 5D is formed in front of the rear end inner surface 5D formed at the rear end portion of the shaft 5, when measuring the inner edge dimension of the guide rail 33 using a measuring tool (not shown) such as a pin gauge, Even if it falls to the inside, the falling pin gauge is locked by the step portion 38 and does not reach the rear end inner surface 5D, and the front cam portion 39 of the rear end inner surface 5D can be protected. Further, when painting or printing on the outer peripheral surface of the rear shaft 5, even if a not-shown mandrel is inserted into the rear shaft 5, the mandrel is locked to the stepped portion 38 and reaches the rear end inner surface 5D. In this case, the front cam portion 39 can be protected. Accordingly, it is possible to prevent the rear shaft 5 from being damaged when performing dimension measurement, painting, or printing.

  Further, the rear end portion of the clip portion 8 is coupled to the rear end portion of the rear shaft 5 so that a sheet-like object can be sandwiched between the clip portion 8 and the outer peripheral surface of the rear shaft 5. Since the longitudinal direction of the clip portion 8 is along the rib 35, the generated stress is generated even if stress is generated inside the side wall of the rear shaft 5 by moving the tip portion of the clip portion 8 away from the outer peripheral surface of the rear shaft 5. It is distributed by the ribs 35 and does not concentrate in one place. For this reason, even if the operation of holding the sheet-like object with the clip portion 8 is repeated many times, the rear shaft 5 is not damaged, and thus the rear shaft 5 can be prevented from being damaged.

  Furthermore, even if a measuring instrument such as a pin gauge falls into the rear shaft 5 during dimension measurement, the falling pin gauge or the like is locked by the stepped portion 38 and does not reach the rear end inner surface 5D, and the front cam portion 39 is deformed. Can be prevented in advance. In addition, even when a mandrel is inserted into the rear shaft 5 during painting or printing, the mandrel is not locked to the stepped portion 38 and reaches the rear end inner surface 5D. The deformation of the front cam portion 39 can be prevented in advance. Thereby, deformation of the front cam portion 39 provided on the rear end inner surface 5D of the rear shaft 5 can be prevented, so that it is possible to prevent the occurrence of problems such as hindering the operation of inserting and removing the ball-point pen tip 2A. it can.

In addition, this invention is not limited to the said embodiment, The deformation | transformation in the range which can achieve the objective of this invention, improvement, etc. are included.
For example, in the above embodiment, when the crown 7 is manufactured by injection molding, a mold having one gate 76 is used. However, the present invention is not limited to this, and a mold having a plurality of gates 76 is used. Also good. For example, as shown in FIG. 20, two gates 76 may be provided in front of the decorative groove 74A and the decorative groove 74C. Even in this case, the portion 77 where the weld mark is formed and the decorative groove 74B are provided. The positions can be matched.

Moreover, in the said embodiment, although the decorative groove 74A-74C arranged in parallel by 90 degree intervals along the circumferential direction was employ | adopted as the decorative groove on the outer peripheral surface of the crown 7, it is not restricted to this. 21, decorative grooves 74 </ b> D to 74 </ b> F arranged in parallel at 120 ° intervals along the circumferential direction on the outer peripheral surface of the crown 7 may be used.
When the decorative grooves 74D to 74F are employed as the decorative grooves, as shown in FIG. 22, it is preferable to provide gates 76 at two locations that are equidistant from the decorative groove 74E in the end surface 76B surrounding the bottom opening of the crown 7. . In this way, the position of the portion 77 where the weld mark is formed and the decorative groove 74E can be matched.

Furthermore, in the above-described embodiment, the gate 76 for injecting the molten resin in the direction along the side wall of the crown 7 from the end surface 76B surrounding the bottom opening of the crown 7 is employed as the gate, but as shown in FIG. Alternatively, a gate 76D for injecting molten resin in a direction intersecting the side wall of the crown 7 from a portion near the edge of the inner peripheral surface 76C of the crown 7 may be employed.
The cursive body is not limited to the ballpoint pen refill, but may be another type of refill, for example, a mechanical pencil refill.

1 Ballpoint pen 2 Ballpoint pen refill 2A Ballpoint pen tip
2B Refill tail plug 2C Coil spring 2D Cylindrical part
2E buttocks 3 shaft cylinder 4 tip shaft
4A Tip 4B Tip 4C Female thread 5 Rear shaft 5A Operation 5B Core
5C Female thread part 5D Rear end inner surface 5E Rising part
5F Bearing hole 5G Rear end 5H Fixed part
5J Male thread part 5K End face 5L Opening 6 Center shaft 7 Crown 7A End edge part 8 Clip part 9 Middle thread pipe 9A Male thread part
9B Male thread 10 Knock stick 10A Knock stick
10B Knock bar 11 Guided protrusion 12 Rear end face
13 Exposed side 13A Identification groove 14 Connection
15 Finger hook 16 Engagement 16A Inclined surface
16B Inclined surface 17 Contact protrusion 18 Surface protrusion
20 Spacer 21 Refill guide 21A Wall
22 Tail plug holding part 23 Cylindrical part 24 Refill insertion part
25 U-shaped groove 26 Round hole 27 Protrusion
28 Tail plug insertion hole 31 Cam shaft support shaft 31A Mating recess
31B Rear end 32 Guide slit 32A Guide slit
32B Guide slit 33 Guide rail 33A Inner edge
33B Guide groove 34 This part 34 part
35 Rib 36 Rib tip side 36A Inner edge
37 Rib rear end side 37A Inner edge 38 Stepped part
39 Front cam part 39A Mountain part 39B Valley part
40 Rotating cam 40A Main body 41 Inclined surface
41A Inclined surface 41B Inclined surface 42 Shaft insertion hole
43 Coil spring 44 Convex 44A Convex
44B Convex 45 Abutment 45A Valley
45B Mountain 46 Locking part 71 Rear end face
72 Stepped surface 73 Stepped hole 74A Decorative groove
74B Decorative groove 74C Decorative groove 74D Decorative groove
74E Decorative groove 74F Decorative groove 75 Edge
75A Escape section 75B Bump section 76 Gate
76B End face 76C Inner peripheral face 76D Gate
77 part 78 cap member 78A collar
81 Clip body part 81A Clamping part 81B Fixed ring part
82 Clip decoration part 82A Decoration part 82B Fixed ring part
83 Top screw tube G Gap

Claims (3)

It has a rear shaft that forms the rear end side of a barrel that houses a plurality of cursive bodies,
A plurality of guide slits that are opened in the circumferential surface of the rear shaft and extend along the axial direction of the rear shaft are arranged in parallel along the circumferential direction of the rear shaft,
A plurality of pairs of guide rails protruding radially inward from a portion along the longitudinal side edge of the guide slit on the inner peripheral surface of the rear shaft are provided,
Among the plurality of pairs of guide rails, a plurality of knock bars that are slidable along the axial direction of the rear shaft by being respectively guided by a pair of guide rails are provided,
Rear end portions of the plurality of writing bodies are respectively connected to the front end portions of the plurality of knock bars,
When one knock bar among the plurality of knock bars is slid toward the front of the shaft cylinder, the tip writing portion of the writing body connected to the knock bar protrudes from the tip opening of the shaft cylinder. To be able to write,
When the other knock bar is slid toward the front of the shaft tube, the tip writing part of the writing body connected to the one knock bar is immersed in the front end of the shaft tube and is restored to the original position. A dual writing instrument formed to return to position,
A rib extending along the axial direction of the rear shaft is formed while projecting radially inward from a portion of the inner peripheral surface of the rear shaft where the guide slit is not formed,
The inner end of the rib in the radial direction of the rear shaft is located outside the inner edge of the guide rail.
In the rib rear end side portion on the rear end side in the rib, the inner inner edge in the radial direction of the rear shaft is located on the inner side of the inner edge of the guide rail,
A stepped portion protruding from the rib front end side portion to the rib rear end side portion is provided at a boundary portion between the rib front end side portion and the rib rear end side portion,
The compound writing instrument, wherein the stepped portion is located in front of the rear shaft with respect to a rear end inner surface formed at a rear end portion of the rear shaft. The rear end portion of the rear shaft is coupled with the rear end portion of the clip portion capable of sandwiching a sheet-like object between the rear shaft and the outer peripheral surface of the rear shaft,
The compound writing instrument according to claim 1, wherein the clip portion is provided on the rear shaft so that a longitudinal direction thereof is along the rib. Inside the rear axle,
A rotating cam disposed in the rear shaft and reciprocally movable along the axial direction;
Cam biasing means for biasing the rotating cam toward the rear end of the rear shaft;
A plurality of knock bar biasing means for biasing each of the plurality of knock bars toward the rear end of the rear shaft;
Is provided,
On the outer peripheral surface of the rotating cam, when a corresponding knock bar is advanced forward, a plurality of convex portions having a locking portion for locking the rear end portion thereof are projected in a circumferential direction,
The convex portion is provided with an inclined surface inclined with respect to the sliding direction of the knock bar,
The knock bar is provided with an engaging portion that engages with the inclined surface,
The inner surface of the rear end of the rear shaft is provided with a front cam portion in which irregularities are formed on the front edge,
A contact portion that meshes with the front cam portion is provided on the rear end surface of the rotating cam,
When the knock bar advances forward, the rotating cam rotates while the inclined surface formed on the convex portion is pressed by the engaging portion, and the abutting portion is guided to the front cam portion. The urging force of the cam urging means is formed so as to advance against the urging force of the knock bar urging means, and when the engaging portion further advances and passes by the side of the convex portion. Is moved back to the original axial position, and the abutting portion is guided to the front cam portion, is reversed to the original rotation angle position, and is arranged at a position where the rear end of the knock bar can be locked. Formed as
3. The compound writing instrument according to claim 1, wherein the step portion of the rib is positioned in front of the rear shaft with respect to a front end edge of the front cam portion.