JP6322937B2 - Slide member of side knock type writing instrument, and side knock type writing instrument using the slide member - Google Patents

Description

  The present invention relates to a slide member of a side knock type writing instrument and a side knock type writing instrument using the slide member.

A writing instrument capable of projecting and retracting a writing body such as a mechanical pencil lead or ballpoint pen disposed inside the shaft tube from the shaft tube, forming a window hole in a side wall of the shaft tube, and forming the window tube in the window hole Side knock type writing instrument in which a knock piece that can be moved in the radial direction is arranged, and by pressing the knock piece, the writing body advances in the axial direction together with the slider arranged in the writing body, and the writing body appears and disappears. As a prior art, a receiving member (slider) includes an inclined guide portion that is driven by a knock member, a cylindrical portion whose rear end is closed, and a connecting portion that connects the inclined guide portion and the cylindrical body. It is also known that the connecting portion is formed by removing at least a portion that prevents the lowering of the leg portion of the knock member (Japanese Patent Laid-Open No. 2002-52891 (Patent Document 1)).

JP 2002-52891 A

  In the prior art described in Patent Document 1, the receiving member has a hollow inclined guide portion provided with a through-hole through which a refill (writing body) passes, and a rear portion from the bottom of the inclined guide portion. A connecting portion formed so as to be elongated toward the rear and the cylindrical body formed at the rear end of the connecting portion and closed at the rear end into which the refill is inserted are integrally formed. And the said connection part is lacking the part which prevents the fall of the leg part of a knock member. The receiving member having such a shape is generally formed of a resin material. However, as a mold structure for resin molding of the receiving member, an inclination guide part, a cavity that forms a tubular body and a connection part, and an inclination guide part The core pin that forms the portion into which the through-hole of the cylindrical portion and the refill of the cylindrical portion are inserted has a structure in which the portion that prevents the lowering of the leg portion of the knock member is directly contacted and sandwiched. At the contact portion, there is a risk of die wear or damage due to misalignment of the core pin, which may shorten the life of the die.

The present invention has been made in view of the above problems, and an opening is formed on the side surface of the shaft cylinder, a knock piece is disposed in the opening, and a writing body is disposed in the shaft cylinder. A slide member of a side-knock type writing instrument that advances the writing body from the shaft cylinder through a slide member by a pressing operation of the knock piece, and the slide member is substantially U-shaped with the upper side opened in the longitudinal direction. The cursive body can be accommodated therein, and a stepped portion standing in the radial direction from the inner wall of the slide member is provided as a pressing portion of the cursive body. The gist of the invention is that a tapered cam surface for receiving the pressing force of the knock piece and moving forward is arranged .

In the present invention, an opening is formed on a side surface of the shaft cylinder, a knock piece is disposed in the opening, a writing body is disposed in the shaft cylinder, and the above-described slide member is interposed by a pressing operation of the knock piece. A slide member of a side knock type writing instrument for advancing a writing body from the shaft cylinder, the slide member having a substantially U-shaped cross section with its upper side opened in the longitudinal direction, and the writing member therein The body can be accommodated, and has a stepped portion standing in the radial direction from the inner wall of the slide member as the pressing portion of the writing body, and further, the outer peripheral surface receives the pressing force of the knock piece to advance Since the tapered cam surface is arranged , the durability of the mold is improved.

1 is a longitudinal half sectional view showing a first embodiment of the present invention. FIG. 2 is an enlarged view of a front portion of a front shaft portion 1 in FIG. AA sectional drawing of FIG. The longitudinal half sectional view of the center axis unit 9 of 1st Example of this invention. The perspective view of the front axis | shaft 6 of 1st Example of this invention. The longitudinal half sectional view of the front axis | shaft 6 of 1st Example of this invention. The perspective view of the taper slide member 7 of 1st Example of this invention. The side view of the knock piece 8 of 1st Example of this invention. The BB cross-section perspective view of FIG. The longitudinal cross-sectional view after pressing the knock piece 8 of FIG. CC sectional drawing of FIG. The disassembled perspective view of the rear-shaft part 2 of 1st Example of this invention. The longitudinal half sectional view showing the 2nd example of the present invention. DD sectional drawing of FIG. The perspective view of the front axis | shaft 23 of 2nd Example of this invention. The perspective view of the taper slide member 24 of 2nd Example of this invention. The side view of the knock piece 25 of 2nd Example of this invention. EE sectional perspective view of FIG. The longitudinal cross-sectional view after pressing the knock piece 23 of FIG. FF sectional drawing of FIG.

The operation will be described. In the present invention, an opening is formed on a side surface of the shaft cylinder, a knock piece is disposed in the opening, a writing body is disposed in the shaft cylinder, and the above-described slide member is interposed by a pressing operation of the knock piece. A slide member of a side knock type writing instrument for advancing a writing body from the shaft cylinder, the slide member having a substantially U-shaped cross section with its upper side opened in the longitudinal direction, and the writing member therein The body can be accommodated, and has a stepped portion standing in the radial direction from the inner wall of the slide member as the pressing portion of the writing body, and further, the outer peripheral surface receives the pressing force of the knock piece to advance The slide member of the side knock type writing instrument is characterized in that a tapered cam surface is arranged .
For this reason, the mold structure for forming the slide member can be a cavity split structure in which one of the cavities is integrated with the core pin, resulting in a relatively simple mold structure. Touch directly and do not pinch. As a result, the risk of die wear or damage due to misalignment of the core pin of the die of the slide member is reduced, and the durability of the die is improved.

A first embodiment of the present embodiment will be described with reference to FIGS. The present embodiment includes a front shaft portion 1 and a rear shaft portion 2.
The front shaft 1 includes a stainless pipe 3, a detent 4, a tip member 5, a mechanical pencil lead 15, a chuck 10, a chuck ring 11, a spring 12, a core 13, a lead tank 14, a front shaft 6, a taper slide member (slide Member) 7, knock piece 8, a total of 12 parts. Among these, a central shaft unit (cursive feeding unit) 9 is constituted by a total of six parts, the mechanical pencil lead 15, chuck 10, chuck ring 11, spring 12, core 13, and lead tank 14.

  A stainless steel pipe 3 made of a metal material and a detent 4 made of a rubber-like elastic body are press-fitted and fixed to the inner diameter portion of the tip member 5 made of a resin material. An internal thread portion 5 a is formed on the inner surface of the tip member 5, and is screwed with an external thread portion 6 a formed at the front end of the front shaft 6.

The middle shaft unit 9 will be described in detail.
The structure of the central shaft unit 9 is made of a resin material such as polypropylene (PP), polyacetal (POM), acrylonitrile butadiene styrene (ABS), acrylonitrile styrene copolymer (AS), polyethylene (PE) on the inner surface of the core 13. The core tank 14 is slidably included in the axial direction. A chuck 10 is fixed to the front of the core tank 14 in the axial direction by means such as press-fitting. Is surrounded by the chuck ring 11. Reference numeral 12 denotes an elastic member such as a coil spring, which is stretched between the core 13 and the core tank 14 and urges the chuck 10 and the core tank 14 backward.
The chuck ring 11 is positioned in front of the front end surface portion of the core 13, and the front end portion of the chuck ring 11 is formed with a flange portion 11 a having a diameter larger than that of the front end opening of the core 13. . The flange portion 11a is in contact with the tip surface 13a of the core 13, and the tapered surface 10a of the chuck 10 and the inner diameter portion 11b of the chuck ring 11 are in contact with each other. Falling backward from the core 13 of the tank 14 is prevented.
At this time, as described above, the spring 12 always urges the chuck 10 and the core tank 14 that are press-fitted and integrated to be integrated backward. As described above, since the spring 12 is disposed between the core 13 and the core tank 14, the chuck 10 does not fall forward.

The assembly of the front shaft portion 1 will be described, and the taper slide member 7 and the knock piece 8 will be described in detail.
The intermediate shaft unit 9 is fixed by sandwiching the outer flange portion 13b at the tip provided in the core 13 of the intermediate shaft unit 9 between the inner step portion 5b of the front member 5 and the front end surface 6b of the front shaft 6, and the rear of the front shaft 6 is fixed. Then, the taper slide member 7 is inserted from the front end opening 7a, and the taper slide member 7 is put on the core tank 14 of the center shaft unit 9. Since the taper slide 7 has a substantially U-shaped cross section and has a wide opening at the tip, the taper slide 7 is easily covered with the core tank 14. Also, when the middle shaft unit 9 is inserted from the front end of the front shaft 6 with the taper slide member 7 inserted into the front shaft 6, the front end opening of the taper slide member 7 is located in the front shaft 6 and can be visually observed. Although there is no state, the front end opening is wide, so that the rear end surface of the core tank 14 of the central shaft unit 9 can be easily inserted. The rear end side of the taper slide member 7 is provided with a wall (step part) 7b so as to stop at the rear end surface 14a of the lead tank 14 when it is put on the lead tank 14, and the wall 7b has a rear shaft. A core insertion hole 7c is provided for removing the portion 2 and inserting a core. The shape of the core insertion hole 7c is substantially U-shaped like the cross section of the taper slide member 7, and the size and shape are not limited as long as the wall 7b can be stopped by the rear end surface 14a of the core tank 14. In this embodiment, the wall 7b is provided on the rear end surface of the taper slide member 7. However, the wall 7b may be provided as a step portion on the front side instead of the rear end surface. If it is formed perpendicularly in the radial direction from a part of the inner wall, it is a relatively simple gold with a cavity split structure in which the core pins are integrated, as in the case where the wall 7b is provided on the rear end surface of the taper slide member 7. It can be a mold structure. In the present embodiment, a rib 7d is provided on the inner surface of the rear end portion of the taper slide member 7. Even if the rib 7d is not provided, the taper slide member 7 comes out because the movement of the taper slide member 7 is restricted by the contact of the cam surface 8c of the knock piece 8 described later and the cam surface 7e of the taper slide member 7. However, there is no problem, but by providing the rib 7d and fitting the rear end portion of the core tank 14 and the taper slide member 7, the taper slide member 7 is more difficult to come out, and rattling can be further prevented.
Here, the tapered slide member 7 is provided with two tapered cam surfaces 7e on the outer peripheral surface thereof. Then, behind the cam surface 7e of the taper slide member 7, there are provided flange portions 7f that are substantially the same shape as the cross section of the inner diameter portion of the front shaft 6 and are slightly different from each other. For this reason, rotation of the taper slide member 7 with respect to the front shaft 6 can be prevented. Further, by providing the flange portion 7f, there is no possibility that the core 15 is erroneously inserted into the gap between the front shaft 6 and the taper slide member 7 when the core is inserted.
An opening 6c is provided on the side surface of the intermediate portion of the front shaft 6. A knock piece 8 having a U-shaped cross section can be moved in the opening 6c in a direction perpendicular to the axial direction. To place. An outer brim portion 8b is formed on each side surface portion 8a of the knock piece 8. The width of the knock piece 8 where the outer flange portion 8b is formed is larger than the width of the opening 6c, so that the knock piece 8 does not come off the opening 6c of the front shaft 6. ing. A through hole 6d into which the side surface portion 8a of the knock piece 8 can enter when the knock piece 8 is pressed is formed on the surface facing the opening 6c of the front shaft 6. If 6d does not affect the size of the outer diameter, there is no problem even if it is not formed. A cam surface 8c made of a taper-shaped protrusion is provided on the inner side of the side surface portion 8a of the knock piece 8 at the front and rear positions, and the taper slide member 7 is slidably disposed in the front shaft 6. It is slidably contacted with tapered cam surfaces 7e provided at the front and rear. Further, the knock piece 8 is asymmetrical in the front-rear direction, but may be symmetric in the front-rear direction in consideration of assemblability. That is, by making the knock piece 8 symmetrical in the longitudinal direction, the knock piece 8 can be assembled to the front shaft 6 without worrying about the front-rear direction of the knock piece 8.
Although the front shaft portion 1 is assembled as described above, the assembly of the mechanical pencil is completed by connecting the rear shaft portion 2 to the front shaft portion 1 by fitting.
In addition, if the structure similar to the structure which covers the taper slide member 7 on the lead tank 14 as in the present embodiment, the center shaft unit 9 can be used in common with other products, so that the quality of the portion where the lead is fed out is stabilized. Can be planned.

The lead feeding (in / out) operation will be described. When the knock piece 8 is pressed, the cam surface 7e provided on the taper slide member 7 is pushed via the cam surface 8c provided on the inner side of the side surface portion 8a of the knock piece 8, and the core is formed via the taper slide member 7. The tank 14 moves forward.
Here, in front of the lead tank 14, a collet chuck 10 for holding and releasing the lead is press-fitted and fixed. A chuck ring 11 that opens and closes the chuck 10 is surrounded in front of the chuck 10. The spring 12 urges the chuck 10 and the taper slide member 7 backward, and closes the chuck 10 to hold the core 15. In addition, a detent 4 made of a rubber material that holds the core 15 lightly and restricts the retraction of the core 15 is disposed inside the tip member 5 that is detachably attached to the front of the front shaft 6.
When the knock piece 8 is pressed and the taper slide member 7 moves forward, the chuck 10 moves forward together. Since the chuck 10 is surrounded by the chuck ring 11, the chuck 10 advances while holding the core 15. When the knock piece 8 is further pressed, the flange portion 11a of the chuck ring 11 collides with the step portion 5c of the tip member 5 and stops moving forward. However, the chuck 10 moves forward with the pressing, so the chuck 10 is released from the surrounding of the chuck ring 11. , Release the wick 15. When the press of the knock piece 8 is released after the lead 15 is released, the chuck 10 is also retracted together with the retraction of the lead tank 14. At this time, the chuck 10 retreats again until the chuck ring 11 is surrounded. However, the lead 15 is lightly held by the detent 4 disposed inside the tip member 5, so that the retraction of the lead 15 is restricted. As a result, the lead 15 is drawn out.

In this embodiment, a part of the rear side of the cam surface 7e of the taper slide member 7 is connected by a side wall (connection portion) 7g, and the height of the side wall 7g behind the cam surface 7e of the taper slide member 7 is set to the height. Since the height of the lead tank 14 is equal to or less than the outer diameter of the lead tank 14 with the taper slide member 7 covered, the knock piece 8 can be pressed to the outer diameter of the lead tank 14. Therefore, the height of the knock coming out from the front shaft can be reduced.
Further, as described above, a through-hole 6d is formed in the surface of the front shaft 6 facing the opening 6c as a space into which the side surface 8a of the knock piece 8 enters when the knock piece 8 is pressed. For this reason, the knock stroke of the knock piece 8 can be increased, and the knock piece 8 can be pressed without the movement of the knock piece 8 being restricted by the inner wall of the front shaft 6. By making the space into which the side surface portion 8a of the knock piece 8 enters into the through hole, the entire thickness of the front shaft 6 can be used for the knock stroke. Here, in this embodiment, two through holes 6d of the front shaft 6 are provided at positions corresponding to the side surface portions 8a of the knock piece 8, but one large through hole may be used.
Further, in the present embodiment, the double structure in which the taper slide member 7 is put on the core tank 14, the diameter of the taper slide member 7 is increased and the width of the knock piece 8 is increased. Since the through-hole 6d is formed in the opposing surface of the opening 6c, the knock stroke can be increased while suppressing the expansion of the inner diameter of the front shaft 6.
Since the knock stroke can be increased, the angle of inclination of the cam surface 7e of the taper slide member 7 and the cam surface 8c of the knock piece 8 with respect to the axis is increased without changing the outer diameter of the front shaft, thereby reducing the knock pressure. It can be a side knock type mechanical pencil.
Also, if the inclination angle is not changed, the knock stroke can be increased with the same outer diameter of the front shaft 6, so the knock stroke can be accommodated even in the slide type that can store the required stainless pipe than the stainless steel pipe fixed type of this configuration. This is possible without increasing the outer diameter of the shaft 6.
In addition, since the knock piece 8 is provided with a groove 8d into which the top 7h of the cam surface 7e of the taper slide member 7 enters, the knock piece 8 can be pressed to the end as described above (FIGS. 9 to 9). 11).
In the present embodiment, the case is described in which the cursive body is a mechanical pencil lead, but the present invention is not limited to the mechanical pencil lead, and may be a cursive body such as a ballpoint pen or a touch pen. In the case of a ballpoint pen, the refill corresponds to the central shaft unit of this embodiment.

A clip receiving portion 16a is formed on the outer periphery of the rear shaft 16 of the rear shaft portion 2, and a clip 17 is fixed to the clip receiving portion 16a. The rotating shaft 18 is included in the rear shaft 16, the rear end surface 16 b of the rear shaft 16 abuts on the step portion 18 a of the rotating shaft 18, and the locking portion 16 c of the rear shaft 16 and the rotating shaft 18 Due to the engagement of the recess 18b, it is disposed so as to be freely movable in the front-rear direction. A guide groove 18 d is formed on the rotating shaft 18 at a position opposed in the longitudinal direction, and a spiral groove portion 16 e is formed on the inner surface of the rear shaft 16.
Further, a convex portion 18 c is formed below the rotating shaft 18, and the convex portion 18 c is lightly press-fitted into the inner diameter portion 16 d of the rear shaft 16. That is, the relative rotation between the rotating shaft 18 and the rear shaft 16 is a rotating operation in a state in which frictional resistance is applied by light press-fitting into the inner diameter portion 16d of the convex portion 18c. By applying this frictional resistance, the eraser 19 is not easily immersed when erasing. The eraser receiver 20 is included in the rotary shaft 18, and the convex portion 20 a of the eraser receiver 20 is slidably fitted in the guide groove 18 d of the rotary shaft 18.

A protrusion 20 b formed on the eraser receiver 20 is fitted into the spiral groove 16 e of the rear shaft 16. The eraser 19 is fixed by a locking portion 19a formed at the end of the eraser 19 and a locking portion 20c formed at the inner diameter portion of the eraser receiver 20. The eraser 19 is elastic. It can be attached and detached by deformation.
By rotating the front shaft 6 and the rotary shaft 18 relatively, the eraser receiver 20 slides in the axial direction while rotating spirally, and the eraser 19 can appear and disappear.

  The front shaft portion 1 and the rear shaft portion 2 are connected by fitting a convex four-point rib 6e formed on the inner diameter portion on the rear side of the front shaft 6 and an entire circumferential recess portion 16f formed on the front side of the rear shaft 16. However, it can be attached and detached freely. In addition, when the core 15 is replenished, the rear shaft portion 2 may be pulled backward, and then the core 15 may be inserted and replenished into the inner diameter portion 14 b of the core tank 14. When it is desired to refit the rear shaft portion 2 to the front shaft portion 1, the four-point rib 6 e of the front shaft 6 and the entire circumferential recess 16 f of the rear shaft 16 may be fitted.

  A plurality of the cores 15 are built in the core tank 14 of the central shaft unit 9. The core 15 reaches the inner diameter portion 10 b of the chuck 10 through the front portion of the inner diameter portion 14 b of the core tank 14. The chuck 10 grips the outer peripheral surface 15 a of the core 15. The gripping operation is performed by the chuck 12 being closed by the chuck ring 11 when the spring 12 biases the chuck 10 backward. Made.

When the core 15 is not gripped by the inner diameter portion 10b of the chuck 10, such as when assembling or replenishing the core, the outer diameter of the tapered surface 10a of the chuck 10 is slightly reduced due to the gripping. The taper slide member 7 integrated with the chuck 10 is retracted in the axial direction by the force of the spring 12 by the amount that is reduced.
At the same time, the knock piece 8 moves from the axial direction to the vertical direction along the opening 6c of the front shaft 6 by the cam surface 8c of the knock piece 8 in contact with the cam surface 7e of the taper slide member 7. In consideration of the amount of movement of the knock piece 8 from the axial direction to the vertical direction in the state where the lead is not gripped, if the knock stroke is increased, the outer diameter of the front shaft 6 becomes thicker. In this case, since the through hole 6d is formed on the surface facing the opening 6c of the front shaft 6, the knock stroke can be increased while suppressing an increase in the inner diameter of the front shaft 6.

The taper slide member 7 of this embodiment is a molded product made of a resin material such as polyacetal (POM), acrylonitrile butadiene styrene (ABS), polycarbonate (PC), or acrylonitrile styrene copolymer (AS). Is formed. The taper slide member 7 has a substantially U-shaped cross section by scraping the surface side (upper side) of the knock piece 8 covering the taper slide member 7 in the longitudinal direction so as to form a cavity split structure in which the core pins are integrated. Therefore, the core pin is not directly put in contact with the cavity (FIG. 7). For this reason, the risk of die wear or damage due to misalignment of the core pin of the die of the taper slide member 7 is reduced, and the durability of the die is improved.
Here, when the rear end side of the taper slide member 7 is put on the lead tank 14, a wall 7b is provided so as to stop at the rear end surface 14a of the lead tank 14, and in this embodiment, the wall 7b is provided with a core insertion hole 7c for removing the rear shaft portion 2 to insert a core, but the core insertion hole 7c is also shaped so that the upper die is cut so that the mold can be divided into upper and lower parts. . In the present embodiment, the case is described in which the writing body is a mechanical pencil lead. However, the writing hand is not limited to a mechanical pencil lead, and may be a writing pen such as a ballpoint pen or a touch pen. Since it is not necessary to replenish, there is no need for the core insertion hole.

A second embodiment will be described with reference to FIGS. The present embodiment is composed of a front shaft portion 21 and a rear shaft portion 22. The description of the same configuration as that of the first embodiment is omitted.
The front shaft portion 21 includes a stainless pipe 3, a detent 4, a tip member 5, a mechanical pencil lead 15, a chuck 10, a chuck ring 11, a spring 12, a core 13, a lead tank 14, a front shaft 23, a taper slide member (slide Member) 24 and a knock piece 25, a total of 12 parts. Among these, a central shaft unit (cursive feeding unit) 9 is constituted by a total of six parts, the mechanical pencil lead 15, chuck 10, chuck ring 11, spring 12, core 13, and lead tank 14. The stainless pipe 3, the detent 4 and the tip member 5 have the same configuration as in the first embodiment.
Similar to the rear shaft portion 2 of the first embodiment, the rear shaft portion 22 is composed of a total of five components: a rear shaft 16, a clip 17, a rotating shaft 18, an eraser receiver 20, and an eraser 19. The assembly and operation method other than the shape of the taper slide member 24 are the same as those in the first embodiment.

As in the first embodiment, the taper slide member 24 has a shape in which the upper side is scraped in the longitudinal direction and a wall (step portion) 24a and a core insertion hole 24b are provided, and a part of the rear side of the two cam surfaces 24c is formed. It is connected by a connecting part 24e. A space portion 24d is provided behind the cam surface 24c, and the width of the connecting portion 24e is substantially equal to or less than the outer diameter of the core tank 14 of the central shaft unit 9. By adopting such a shape, the width of the knock piece 25 can be reduced while suppressing the expansion of the inner diameter of the front shaft 23.
Here, the taper slide member 24 is formed of a molded product made of a resin material. The taper slide member 24 has a substantially U-shaped cross section by scraping the surface side (upper side) of the knock piece 25 covering the taper slide member 24 in the longitudinal direction so as to form a cavity split structure in which the core pins are integrated. Therefore, the core pin is not directly put in contact with the cavity (FIG. 16). For this reason, the risk of die wear or damage due to misalignment of the core pin of the die of the taper slide member 24 is reduced, and the durability of the die is improved.

Even in this embodiment, as in the first embodiment, when the knock piece 25 is pressed into the facing surface of the opening 23a of the front shaft 23, the space 25b of the knock piece 25 enters. A through hole 23b is formed. Therefore, the knock stroke of the knock piece 25 can be increased, and the knock piece 25 can be pressed without the movement of the knock piece 25 being restricted by the inner wall of the front shaft 23. The through hole 23b may not necessarily be formed as long as the outer diameter of the shaft 23 is not affected. In the case where the through hole 23b is formed, in the present embodiment, the two through holes 23b of the front shaft 23 are provided at positions corresponding to the side surface portions 25b of the knock piece 25. However, as one large through hole, good.
In addition, the top portion 24f of the cam surface 24c sandwiched between the space portions 24d is formed higher than the outer peripheral surface of the core tank 14, but the groove 25a into which the top portion 24f of the cam surface 24c enters when the knock piece 25 is pressed. Since the knock piece 25 is provided, the knock piece 25 can be pressed to the end as described above (FIGS. 18 to 20).
In the present embodiment, the case is described in which the cursive body is a mechanical pencil lead, but the present invention is not limited to the mechanical pencil lead, and may be a cursive body such as a ballpoint pen or a touch pen. In the case of a ballpoint pen, the refill corresponds to the central shaft unit of this embodiment.

DESCRIPTION OF SYMBOLS 1 Front shaft part 2 Rear shaft part 3 Stainless steel pipe 4 Detent 5 Front member 5a Female thread part 5b Inner stage part 5c Step part 6 Front shaft 6a Male thread part 6b Front end surface 6c Opening part 6d Through-hole 6e Four-point rib 7 Tapered slide member (Slide member)
7a Tip opening 7b Wall (step)
7c Core insertion hole 7d Rib 7e Cam surface 7f Head 7g Side wall (connecting part)
7h Top portion 8 Knock piece 8a Side surface portion 8b Outer flange portion 8c Cam surface 8d Groove 9 Central shaft unit 10 Chuck 10a Tapered surface 10b Inner diameter portion 11 Chuck ring 11a Overhead portion 11b Inner diameter portion 12 Spring 13 Core 13a End surface 13b Outer flange portion 13b Core tank 14a Rear end surface 14b Inner diameter portion 15 Core 15a Outer peripheral surface 16 Rear shaft 16a Clip receiving portion 16b Rear end surface 16c Locking portion 16d Inner diameter portion 16e Spiral groove portion 16f All-around concave portion 17 Clip 18 Rotating shaft 18a Step portion 18b Concavity portion 18c Convex portion 18d Guide groove 19 Eraser 19a Locking portion 20 Eraser receiver 20a Protruding portion 20b Protruding portion 20c Locking portion 21 Front shaft portion 22 Rear shaft portion 23 Front shaft 23a Opening portion 23b Through hole 24 Tapered slide member (slide member)
24a Wall (step)
24b Core insertion hole 24c Cam surface 24d Space part 24e Connection part 24f Top part 25 Knock piece 25a Groove 25b Side part

Claims (3)

An opening is formed on a side surface of the shaft cylinder, a knock piece is disposed in the opening, a writing body is disposed inside the shaft cylinder, and the writing body is placed through the slide member by a pressing operation of the knock piece. A slide member of a side knock type writing instrument that is advanced from a shaft cylinder, the slide member having a substantially U-shaped cross section that is open on the upper side in the longitudinal direction, and can accommodate the writing body therein. And a tapered cam having a stepped portion standing in the radial direction from the inner wall of the slide member as a pressing portion of the writing body and further moving forward on the outer peripheral surface under the pressing force of the knock piece A sliding member for a side knock type writing instrument with a surface .   The slide member of the side knock type writing instrument according to claim 1, wherein a space portion is provided behind a cam surface formed on an outer peripheral surface of the slide member.   A side knock type writing instrument having the slide member according to claim 1.

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