JP2004255682A - Retractable writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that even when an ejecting action is performed, a stopper continuously receives resistance with a cushioning member to make an ejecting operation heavy and thereby to make operability worse. <P>SOLUTION: This retractable writing implement is composed of arranging movably forward and backward a writing member energized backward by an elastic member in a shaft cylinder. This retractable writing implement is provided with a restricting part for restricting a retreating position of the writing member in the shaft cylinder, and a cushioning part is integrally formed on the restricting part. In addition, the cushioning part may be integrally formed deformably inward so as to bring the writing member into contact with the restricting part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a retractable writing instrument in which a writing member urged rearward by a resilient member is disposed in a shaft cylinder so as to be able to move back and forth.
[0002]
[Prior art]
A barrel having an opening through which a writing portion enters and exits, extending substantially in the axial direction from the other open end, and defining a guide groove having a locking portion; storing ink therein; An ink tank having a knock portion formed on the other side, and an elastic body disposed between the barrel and the ink tank, for urging the ink tank in a direction of immersion of the writing portion. A clip portion is provided via a base portion, and the base portion of the clip portion is inserted into the guide groove. When the knock portion of the ink tank is pressed against an elastic body, the base portion of the clip portion is engaged with the guide groove. The clip portion is retained in a writable state by being locked to the stop portion, and by releasing the clip portion, the engagement with the lock portion is released, and the ink tank returns and moves the writing portion to the retracted state. In the knock-type writing instrument, the barrel A knock-type writing instrument (see Patent Literature 1) in which a buffer is formed in the groove to reduce the return movement speed by giving resistance to the movement of the clip when the clip moves, or a knock that projects upward from the upper end surface of the shaft. A means for locking the writing tip of the cursive body by pressing the cover downward so as to protrude from the lower end of the shaft, and a means for releasing the locking, and a knock cover or the like when the locking is released. A return spring for returning the member upward, and the abutting portion of the member which stops rising by being integrally raised with a knock cover or the like by the force of the return spring and abutting against a member serving as a stopper There is known a knock-type writing instrument (see Patent Document 2) in which a shock-absorbing member having flexibility and elasticity is attached.
[0003]
[Patent Document 1]
JP-A-7-329486 (Claim 1, FIG. 2).
[Patent Document 2]
Japanese Patent Application Laid-Open No. 9-272296 (Claim 1, FIG. 1, FIG. 3)
[0004]
[Problems to be solved by the invention]
However, in the case of Patent Document 1, since the buffer means is formed of a separate member, the number of parts is large, and the cost of parts and the cost required for assembly are increased.
Further, in Patent Literature 2, when the protruding operation is performed, the stopper continues to receive the resistance by the buffer member, so that the protruding operation becomes heavy and the operability is deteriorated.
[0005]
[Means for Solving the Problems]
The present invention is a retractable writing instrument in which a writing member urged rearward by a resilient member is disposed in a barrel so as to be able to move back and forth, and a regulating part that regulates a retreat position of the writing member is provided in the barrel. A first object of the present invention is to provide a writable writing instrument in which a buffer member is integrally formed with the restricting portion, and a writing member urged rearward by a resilient member is disposed in the shaft cylinder so as to be movable back and forth. A second gist is that a restricting portion for restricting the retreat position of the writing member is provided on the shaft cylinder, and an inwardly deformable buffer portion that contacts the restricting portion is integrally formed on the writing member.
[0006]
[Action]
The assembling is simplified, and the buffer does not act during the projecting operation.
[0007]
【Example】
A mechanical pencil (a mechanical pencil) in which a mechanical pencil is disposed inside a barrel and the mechanical pencil projects by pressing a knock member disposed at a rear portion of the mechanical cylinder will be described as an example. However, the present invention is not limited to this. The object disposed inside may be a ballpoint pen, and is not limited to a writing instrument, but may be an electronic input pen or the like.
Although the front end 2 is integrally formed at the front end of the barrel 1, it may be formed of separate members and fixed to each other detachably by means such as screwing. A center shaft 3 is disposed inside the shaft cylinder 1 so as to be movable back and forth, and a leading end 4 is detachably fixed to a tip of the center shaft 3 by means such as screwing. Although the lead protection tube 5 for guiding the lead is integrally formed at the tip of the leading tool 4, it may be constituted by separate members and fixed to each other by means such as press fitting. The center shaft 3 and the leading tool 4 are normally urged rearward by the resilient member 6 and are housed in the shaft cylinder 1. It can be protruded.
[0008]
On the other hand, a tail crown 7 is attached to the rear part of the barrel 1, and a clip 8 urged in the radial direction of the barrel 1 is fixed to the tail crown 7. A ball portion 9 is formed. Then, when the center shaft 3 moves forward and the rear end 10 of the center shaft 3 reaches the ball portion 9, the front portion of the clip 8 rotates so as to fall down in the radial direction through the window hole 1 a of the shaft cylinder 1, The engaging portion 11 of the clip 7 engages with the rear end 9 of the center shaft 4.
Here, the clip 8 includes an elastic clip body 12 made of a metal material and a pressing member 13 made of a resin material and having relatively low elasticity. However, the present invention is not limited to this. The clip body may be made of an elastic resin material, while the pressing operation member may be made of a non-elastic metal material. The rear portion of the clip body 12 is formed in a U-shape (clip base portion), and the clip base portion is press-fitted and fixed to the tail crown 7 detachably fixed to the rear portion of the barrel 1.
[0009]
Next, a connection structure between the barrel 1 and the tail crown 7 will be described. In the rear part of the shaft cylinder 1, the engaging hole 14 is formed at two places facing the rear end side wall part, but it may be formed at three places or the like.
On the other hand, the tail crown 7 is formed of a resin material which is hard but slightly elastically deformable, and an engagement projection 15 which engages with the engagement hole 14 is formed on a lower outer peripheral surface of the tail crown 7. Is formed. A slit 16 is formed in the longitudinal direction at a position rotated by 90 degrees from the position of the engagement protrusion 15. The slits 16 are also formed at two opposing locations. An elastically deformable projection 17 is formed in front of the slit 16 and on the front end face of the tail crown 7. Note that the front end of the slit 16 is formed to extend so as to reach the projection 17. The slit 16 and the projection 17 correspond to the buffer of the present invention.
[0010]
A lead tank 18 is slidably disposed inside the center shaft 3, and a chuck body 19 for holding and releasing the lead is fixed to the front end of the lead tank 18. A chuck ring 20 for opening and closing the chuck body 19 is bent at the front portion of the chuck body 19. In front of the chuck body 19, there is located a center detent member 21 made of a rubber-like elastic body for preventing the core from retreating, and the center detent member 21 is press-fitted and fixed to the inner surface of the leading tool 4. Have been. Reference numeral 22 denotes a resilient member such as a coil spring for urging the lead tank 18 and the chuck body 19 rearward, and is stretched between the center shaft 3 and the lead tank 19.
On the other hand, a flange portion 23 is formed at a rear portion of the core tank 18, and the central shaft 3 is in contact with the protrusion 17 of the tail crown 7 when the center shaft 3 is in the housed state. An eraser 24 is detachably fitted to the rear end of the core tank 18, and a knock member 25 is detachably attached so as to cover the eraser 24.
[0011]
Next, a usage example will be described. When the knock member 25 is pressed, the center shaft 3 and the core tank 18 move forward against the elastic force of the elastic member 6, and the leading tool 4 and the core protecting tube 5 are moved from the tip of the tip 2. Protrude. At this time, the rear end 10 of the center shaft 3 is engaged with the engaging portion 11 of the clip 8, and the retraction operation of the elastic member 6 due to the returning force is prevented. Here, if the knock member 25 is further pressed after being returned once, the lead tank 18 and the chuck body 19 move forward against the resilience of the repellent member 22, and the lead is fed out.
When it is desired to store the leading tool 4 in the leading end 2 again, the rear part of the pushing operation member 13 fixed to the clip 7 is pushed in the direction of the barrel 1. With this operation, the clip main body 12 rotates so that the front portion is lifted with the contact portion S of the clip main body 12 with the tail crown 7 as a fulcrum, and the engagement between the engaging portion 11 and the rear end 10 of the center shaft 3 is released. Is done. At this moment, the center shaft 3 moves back together with the core tank 18 and the like by the restoring action of the resilient member 6. Due to the restoring action, the flange 23 of the core tank 18 collides with the projection 17 of the tail crown 7, and the impact force is reduced by the projection 17 and the slit 16. That is, the projection 17 is elastically deformed in the direction of the slit 16, and the elastic deformation has a relaxing effect. At this time, the tail crown 7 itself is also slightly elastically deformed in the expanding direction, so that the engagement force between the engagement projection 15 of the tail crown 17 and the engagement hole 14 of the barrel 1 is increased. Of the shaft cylinder 1 is prevented (see FIG. 5).
[0012]
When the center shaft 3 is returned, the flange portion 23 of the core tank 18 is pressed against the front end face of the tail crown 7 projection 17. When the retracted position of the lead tank 18 is regulated, the chuck body 19 is opened, and the lead is easily buried in the lead tank even in the state where the lead is extended.
[0013]
A second example will be described with reference to FIGS. The configuration other than the tail crown is the same as that of the first example, and the description thereof is omitted. A plurality of slits 27 are partially formed in the front part of the tail crown 26 in the circumferential direction and in the axial direction. When the shaft 3 returns, the flange 23 of the core tank 18 collides with the front end face of the tail cap 26, and the impact force is reduced by the plurality of slits. That is, the front portion of the tail crown 26 is elastically deformed in the axial direction by the impact force. Compared with the first example, the flange 23 abuts on the front end face of the tail crown 26 with a circumferential surface, so that it is possible to disperse the impact force and to obtain a stable impact relaxation.
A third example will be described with reference to FIGS. This is an example in which the core tank 18 is provided with a buffer. The buffer portion of the present embodiment is constituted by an elastic piece 28 provided at an intermediate portion of the core tank 18. More specifically, elastic pieces 28 which are inwardly deformable and are expanded outward are formed at two opposing positions in the middle of the core tank 18. The elastic piece 28 is inwardly deformed by the inner diameter of the tail crown 29 when the center shaft 3 is stored, but expands outward by its own elastic restoring force in the protruding state. (See FIG. 9). That is, when the center shaft 3 is stored, the elastic piece 28 is gradually deformed inward by the inner diameter of the tail crown 29 (see FIG. 11). The inward deformation of the elastic piece 18 reduces the impact. In the present example, the buffer relaxation action is started in the process of the return of the center shaft 3, so that more reliable relaxation can be obtained. Further, since the elastic piece 18 enters the inside of the tail crown 29, the inward deformation of the tail crown 29 is restricted, so that the engagement force of the tail crown 29 with the barrel 1 is increased, and the effect of preventing falling off is also enhanced.
[0014]
【The invention's effect】
The present invention is a retractable writing instrument in which a writing member urged rearward by a resilient member is disposed in a barrel so as to be able to move back and forth, and a regulating portion that regulates a retreat position of the writing member is provided in the barrel. A first object of the present invention is to provide a retractable writing instrument in which a buffer member is integrally formed with the regulating section, and a writing member urged rearward by a resilient member is disposed in the shaft cylinder so as to be movable back and forth. The second gist of the present invention is that a restricting portion for restricting the retreat position of the writing member is provided on the shaft cylinder, and an inwardly deformable buffer portion that contacts the restricting portion is integrally formed on the writing member. It is possible to provide a retractable writing instrument having a simple structure and good operability.
[Brief description of the drawings]
FIG. 1 is an external view showing a first example of the present invention.
FIG. 2 is a longitudinal sectional view of a main part of FIG.
FIG. 3 is a perspective view of FIG. 1;
FIG. 4 is a longitudinal sectional view of FIG.
FIG. 5 is a vertical sectional view of a main part showing an operation.
FIG. 6 is a longitudinal sectional view of a main part showing a second example.
FIG. 7 is a perspective view of FIG. 6;
FIG. 8 is a vertical sectional view of a main part showing a third example (immersed state).
FIG. 9 is a perspective view of FIG. 8;
FIG. 10 is a longitudinal sectional view showing the operation (projected state).
FIG. 11 is a longitudinal sectional view showing an operation (immersion process).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1a Window hole 2 Front part 3 Center shaft 4 Front tool 5 Core protection tube part 6 Repellent member 7 Tail cap 8 Clip 9 Ball part 10 Rear end part 11 Engagement part 12 Clip body 13 Press operation member 14 Engagement hole 15 Engagement projection 16 Slit 17 Protrusion 18 Core tank 19 Chuck body 20 Chuck ring 21 Core detent member 22 Repellent member 23 Flange 24 Eraser 25 Knock member 26 Crown 27 Slit 28 Elastic piece 29 Crown S Contact

Claims (3)

A retractable writing instrument in which a writing member urged rearward by a repelling member in a shaft cylinder is disposed so as to be able to move back and forth, and a regulating portion for regulating a retreat position of the writing member is provided on the shaft cylinder, and the A retractable writing implement characterized in that a buffer part is formed integrally with the regulating part. A retractable writing instrument in which a writing member urged rearward by a resilient member is disposed in the shaft cylinder so as to be able to move back and forth, and a regulating portion for regulating a retreat position of the writing member is provided on the shaft cylinder, An in-and-out type writing instrument, wherein an inwardly deformable buffer portion that comes into contact with the regulating portion is integrally formed on the writing member. The said restriction | limiting part is comprised with a member different from a shaft cylinder, while connecting said restriction | limiting part and a shaft cylinder, and the restriction | limiting part was able to expand in a radial direction, The Claim 1 or Claim 2 characterized by the above-mentioned. 2. The retractable writing implement according to 2.

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