JP2008302504A - Retractable writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the "shaking of push-button element" during writing, to make distinguishable the state of the writing tip end projecting from the tip-end opening of a barrel of a writing utensil merely by looking at the projected length of the push-button element from the barrel, when the utensil is inserted into the pocket of a garment or the like, and to reduce a push-button noise caused by a rotary cam during the operation of the push-button element, in a retractable writing utensil having a retractable delivery mechanism constituted of cam grooves, a fixed cam, a rotary cam and a push-button element. <P>SOLUTION: In the push-button element 21 constituted of a rod-like shaft 19 and a push button 20, the rod-like shaft 19 is inserted into the fixed cam 9 and the rotary cam 11, and a spring receiving part 22 that can come into contact with the front end 11b of the rotary cam 11 is fixed. A second compressed coil spring 23 is arranged between the spring receiving part 22 and the rotary cam 11. Then, the rear end of a ball point pen refill 14 and the spring receiving part 22 are connected to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a knock-type writing instrument having a knock-type feeding mechanism composed of a cam groove, a fixed cam, a rotating cam, and a knock body.

  Conventionally, the writing tip portion of the writing body accommodated by being biased rearward by a spring in the shaft cylinder is provided in the shaft cylinder, and is slidably disposed back and forth along the cam groove. The shaft cylinder has a fixed cam having a concave-convex cam at the tip, a rotating cam having a cam receiving portion meshing with the cam, and a knock-type feeding mechanism composed of a knock body for pressing the fixed cam. Knock type writing instruments made to appear and disappear from the opening at the tip are known. In such a knock-type writing instrument, when the knock body is pressed, the fixed cam pressed by the knock body moves forward along the cam groove, and the rotating cam also moves forward in conjunction with the fixed cam, directly or indirectly to the rotating cam. The articulated cursives also move forward in conjunction with each other, and the writing tip part projects from the tip opening part of the shaft tube. Since the rotating cam rotates and is locked to the locking portion of the cam groove and the backward movement is suppressed, the writing tip portion is maintained in a state of protruding from the tip opening portion of the shaft tube. In order to immerse the writing tip portion into the shaft cylinder, the knocking body is pressed again, the rotating cam is slightly advanced and rotated, and the locking with the locking portion of the cam groove of the rotating cam is released. The rotating cam and the fixed cam are pushed backward through the writing body urged to the rear end side by the spring, so that the writing body is also retracted, and the writing leading end is immersed in the shaft cylinder.

  When the knock body is pressed and the writing tip of the writing body protrudes from the tip opening of the shaft tube, the rotating cam is locked to the locking portion provided at the tip of the cam groove as described above. The cam maintains the forward position without moving backward, but the knock body and the fixed cam can move backward away from the rotating cam and return to the original position. Therefore, the knock body and the fixed cam can move back and forth between the advanced rotary cam and the original position, and there is a problem that the knock body is rattling.

  A technique for disposing a return spring between a rotating cam and a knock body is known as a means for solving the former “knock of the knock body”. However, in such a technique, the knock body is pressed and the knock body returns to its original position even in a state where the writing tip of the writing body accommodated in the shaft cylinder protrudes from the tip opening of the shaft cylinder. For example, when a writing instrument is inserted into a pocket such as clothing, just looking at the head of the writing instrument exposed from the pocket, the writing tip of the writing body protrudes from the tip opening of the shaft tube or is immersed. It is not possible to determine whether this is the case. If you accidentally press the knocked body while it is inserted in the pocket, the writing tip of the writing body will remain protruding from the tip opening of the shaft tube, and the writing tip will come into contact with the fabric such as the pocket. Ink filled in the cursive material may permeate into the cloth and the like, and the clothes and the like may be stained with the ink.

  Further, in a knock type writing instrument having a feeding mechanism composed of such a cam groove, a rotating cam, a fixed cam and a knock body, the knock body is used to project the writing tip portion of the writing body from the tip opening portion of the shaft cylinder. When the is pressed, the rotating cam moves forward and rotates as described above, and the rotating cam is moved backward by the spring that biases the writing body backward, and the cam receiving portion locked to the cam groove is locked to the cam groove. Lock to the part. At that time, an impulsive sound is generated to the locking portion of the cam receiving portion. Further, when the knock body is pressed to immerse the writing tip portion of the writing body into the tip opening portion of the shaft tube, the rotating cam advances and releases the locking of the cam receiving portion to the locking portion of the cam groove, The rotating cam also moves backward by the spring that urges the writing body backward, and the fixed cam and knocking body move backward to the stationary cam or knocking body that is waiting in the original position or in conjunction with the rotating cam, and the cam groove A fixed cam or a knocking body comes into contact with the rear end wall surface of the cam groove to be formed, and an impact sound is generated at that time.

  Since the knocking noise generated when operating the knocking body as described above is generated when it comes into contact with another member when the rotating cam is retracted, the momentum when the rotating cam is retracted can be reduced in order to reduce the knocking noise. The force to retract the rotary cam depends on the spring force of the spring that urges the writing body to the rear, so the spring force of the spring should be reduced. There is a problem that the writing tip of the cursive body protrudes from the tip opening of the shaft tube only by touching.

Recently, in a knock-type writing instrument, a technology that makes a so-called knocking noise generated by a rotating cam during operation of this type of knocking body quiet, and solves a rattling sound generated from `` knocking rattling, JP-A-2007-83498 proposes. However, the disclosed structure for preventing “knocking of the knock body” is that the return spring 9 extends over the rear end portion of the knock body 1 or the shaft cylinder 10 from the rotor 3 or the shaft body 4. In addition, the knock body 1 is urged rearward by the spring 5 having a weak urging force to eliminate the free state of the knock body 1 when the writing body 8 protrudes (see paragraph 0017). Description) As described above, in such a structure, when the writing instrument is inserted into a pocket such as clothes, the writing tip of the writing instrument is the shaft cylinder only by looking at the head of the writing instrument exposed from the pocket. It cannot be determined whether it is in a state of protruding from the tip opening or in an immersive state.
JP 2007-83498 A

  The present invention includes a cam groove formed on an inner wall surface of a shaft cylinder provided on the shaft cylinder, with a writing tip portion of a writing body accommodated by being biased rearward by a spring in the shaft cylinder, along the cam groove Knock composed of a fixed cam having a concave-convex cam at the tip disposed slidably forward and backward, a rotating cam having a cam receiving portion meshing with the cam, and a knock body for pressing the fixed cam In the knock-type writing instrument that is projected and retracted from the opening of the tip of the shaft cylinder by the type feeding mechanism, with a simple structure, it eliminates `` knocking of the knocking body '' at the time of writing and is inserted into a pocket such as clothes, It is possible to determine that the writing tip of the writing body protrudes from the opening of the tip of the shaft tube by simply looking at the amount of protrusion from the shaft tube of the knocking body, and rotation during operation of the knocking body. Knock-type brush with reduced knocking noise generated by the cam It is intended to propose the ingredients.

The present invention
“1. The writing tip portion of the writing body accommodated by being biased rearward by a spring in the shaft cylinder is provided on the shaft cylinder, and is slidably disposed back and forth along the cam groove. The shaft cylinder has a fixed cam having a concave-convex cam at the tip, a rotating cam having a cam receiving portion meshing with the cam, and a knock-type feeding mechanism composed of a knock body for pressing the fixed cam. A knock-type writing instrument that is projected and retracted from a tip opening, wherein the knock body is composed of a rod-shaped shaft portion and a knock portion having an outer diameter larger than the outer diameter of the rod-shaped shaft portion, and the rod-shaped shaft portion is fixed cam And the sliding cam is slidably inserted, the knocking portion is positioned behind the fixed cam, and at least a portion of the knocking portion is disposed so as to protrude outward from the rear end of the shaft cylinder. A spring support is provided on the rod-shaped shaft at a more forward position, and the spring support is placed after the cursive A second spring that has a spring force that is weaker than the spring force that biases the writing body backward by contacting one end with the spring receiving portion and the other end against the inner wall surface of the rotating cam. Then, the spring receiving portion pressed backward through the cursive body is brought into contact with the rotating cam, the front end surface of the knock portion and the rear end surface of the fixed cam are separated, and the front end surface of the knock portion is knocked to the knock body. A knock-type writing instrument in which the knock body advances the fixed cam and the rotating cam in a state in which is in contact with the rear end surface of the fixed cam and the spring receiving portion is separated from the rotating cam.
It is.

  In the knock type writing instrument of the present invention, the spring receiving portion provided at the tip of the knock body is connected to the rear end portion of the writing body urged rearward by the spring. A state in which the front end surface of the receiving portion is in contact, or a state in which the rear end portion of the writing body is provided with a fitting hole in the spring receiving portion and the rear end portion of the writing body is fitted in the fitting hole, or the opening of the writing body This means a connected state such as a state in which a protrusion formed on the spring receiving portion is engaged with the rear end portion. Therefore, although the knock body is also always urged rearward through the writing body, the backward sliding of the knock body is restricted by the spring receiving portion coming into contact with the rotating cam.

  In addition, it is necessary to dispose the knock body by separating the front end surface of the knock portion and the rear end surface of the fixed cam, for the following reason. In order to make the writing tip portion of the writing body appear and disappear from the tip opening portion of the shaft cylinder, it is necessary to press the knock body to advance the fixed cam and the rotating cam, and to rotate the rotating cam with respect to the fixed cam. In the conventional knock-type writing instrument, when the forward rotating cam is separated from the cam groove, the rotating cam is pressed rearward through the writing body biased backward, so that the cam provided on the fixed cam and the rotating cam The rotating cam rotates relative to the fixed cam because of the relationship between the cam receiving portion that meshes with the cam and the inclined surface at the tip of the cam groove. In the knock type writing instrument of the present invention, in order to solve the above-described problem, a second elastic force that is weaker than the elastic force of the spring is not affected by the spring that biases the writing body backward. When the knock body is pressed by separating the front end surface of the knock portion from the rear end surface of the fixed cam, the front end surface of the knock portion and the rear end surface of the fixed cam first come into contact with each other. When the spring receiving portion is separated from the rotating cam, the fixed cam and the rotating cam advance, and when the advanced rotating cam is separated from the cam groove, the rotating cam is pressed backward by the elastic force of the second spring, and the cursive body This is because the rotating cam can be rotated with respect to the fixed cam by the same operation as that of the conventional structure without being affected by the spring for urging the rearwardly.

  Since the knock type writing instrument of the present invention has the structure as described above, the spring receiving portion provided on the knock body is connected to the rear end portion of the writing body biased backward except when the knock body is operated. Since the portion is in contact with the rotating cam in a state of being pressed rearward, the knock body does not slide back and forth in the shaft tube and does not rattle back and forth. In addition, when the writing tip of the writing body protrudes from the tip opening of the shaft tube, the rotating cam is locked in the cam groove and cannot be retracted, and the spring receiving portion provided on the knocking body contacts the rotating cam. Since the knock body is in contact with each other, the knock body is maintained in the advanced state, and if the state of the knock body is observed, it can be determined whether the writing tip portion of the writing body protrudes from the tip opening portion of the shaft tube or is immersed.

  Also, in order to make the writing tip of the writing body appear and disappear from the opening of the tip of the shaft tube, after the rotating cam is advanced, the rotating cam is rotated and retracted, and the cam receiving portion of the rotating cam is engaged with the cam groove. The locking cam needs to be locked or unlocked, but the retraction of the rotating cam is obtained by the spring force of the spring for urging the writing body backward like the conventional knock type writing instrument. Since it is obtained by the elastic force of the second spring that is weaker than the elastic force of the spring disposed in the rotating cam, the writing tip of the writing body is projected from the tip opening of the shaft cylinder. To the fixed cam of the rotating cam when the cam receiving portion of the rotating cam is locked to the locking portion of the cam groove or when the writing tip of the writing body is immersed from the tip opening of the shaft cylinder The impact sound that is generated when impacting is greater than that of a conventional knock-type writing instrument. Since the serial momentum at the time of recession is weak, it becomes the abutment sound is small.

  The knock type writing instrument of the present invention has a conventionally known cam groove formed on the inner wall surface of the shaft cylinder behind the writing body, and irregularities at the tip that is slidable back and forth along the cam groove. A knock type feeding mechanism comprising a fixed cam having a cam-like cam, a rotating cam having a cam receiving portion meshing with the cam, and a knock body for pressing the fixed cam. A second spring that generates a spring force that is weaker than the biasing force of the spring that biases the writing body rearward so that the knocking body springs toward the front end opening of the shaft tube and the rotating cam toward the rear end side of the shaft tube. Is provided.

  Although this embodiment will be described with reference to the drawings, a knock type ballpoint pen in which a ballpoint pen refill is accommodated in a shaft cylinder will be described as an example of a knock type writing instrument, but the present invention is not limited to this. FIG. 1 is a longitudinal sectional view of the knock type ballpoint pen of the present embodiment. FIG. 2 is an enlarged view of a main part in FIG. FIG. 3 is a view showing an operation of the knock type ballpoint pen of the present embodiment and showing an initial state in which the knock body is pressed. FIG. 4 is a view showing the operation of the knock type ballpoint pen of the present embodiment, in which the writing tip portion of the writing body protrudes from the tip opening portion of the shaft tube. FIG. 5 is a view showing a state where the writing tip of the writing body is protruded from the tip opening of the shaft cylinder in the knock type ballpoint pen of the present embodiment.

    As shown in FIG. 1 and FIG. 2, the knock type ballpoint pen 1 of this embodiment comprises a shaft cylinder 2 including a tip cylinder 2a having a front end opening 3, a front shaft 2b, and a rear shaft 2c. The front shaft 2b and the front shaft 2b and the rear shaft 2c are detachably attached to each other by screwing. A grip 4 is attached to the front shaft 2b. A tail tube 6 provided with a clip 5 is attached to the rear end of the rear shaft 2c. Similar to the conventional knock type ball-point pen, a cam groove 7 is formed on the inner wall surface of the rear shaft, and a fixed cam 9 having a cam 8 having a mountain-shaped unevenness at the tip, and a cam receiving portion meshing with the cam surface A rotating cam 11 having 10 is slidably disposed along the cam groove 7. The rotating cam 11 is provided with a shaft portion 11 a that is inserted into the fixed cam 9, and the shaft portion 11 a is arranged to be slidable with respect to the fixed cam 9.

  The shaft cylinder 2 accommodates a ballpoint pen refill 14 as a writing body formed by attaching a ballpoint pen tip 12 serving as a writing tip portion to the tip of an ink containing cylinder 13 containing ink (not shown), and one end of the pen tip The other end of the cylinder 2a is urged rearward (on the feeding mechanism side) by a first compression coil spring 16 disposed in contact with an outward projecting portion 15 formed on the ballpoint pen refill 14 at the other end. The first compression coil spring 16 is generally employed in a knock type ballpoint pen.

  The fixed cam 9 has a through hole 17 penetrating in the front-rear direction, and the shaft portion 10 a of the rotating cam 11 is inserted into the through hole 17. The rotating cam 11 also has a through hole 18 that penetrates forward and backward including the shaft portion 11a. A knock body 21 composed of a rod-shaped shaft portion 19 and a knock portion 20 having an outer diameter larger than the outer diameter of the rod-shaped shaft portion 19, and the rod-shaped shaft portion 19 is a shaft portion 11 a of the fixed cam 9 and the rotating cam 11. Further, one end of the knock body 21 is inserted into the rotary cam 11 and protruded from the tail cylinder 6 attached to the rear end of the rear shaft 2c, and is disposed in the rear shaft 2c. A spring receiving portion 22 is fixed to the front end of the rod-shaped shaft portion 19, and the spring receiving portion 22 is provided in contact with the front end 11 b of the rotating cam 11. Further, in the rotary cam 11, one end of the first compression coil spring 15 that urges the writing body backward by abutting one end against the inner wall surface of the rotary cam 11 and the other end against the spring receiving portion 22. The second compression coil spring 23 is disposed so as to have a resilient force weaker than the resilient force.

  A fitting hole 24 is provided in the spring receiving portion 22, and a rear end portion of the ballpoint pen refill 14 is fitted and connected to the ballpoint pen refill 14. Therefore, by pushing the knock body 21, the ballpoint pen feel 14 is moved forward via the spring receiving portion 22, and the knock body 21 also causes the ballpoint pen feel 14 to be moved by the first compression coil spring 16 that urges the ballpoint pen feel 14 backward. It is always urged backward.

  The operation of the knock type ballpoint pen 1 according to the present embodiment will be described with reference to FIGS. 3 to 6. First, as shown in FIG. 3, when the knock portion 20 of the knock body 21 is pressed, the knock body 21 moves forward, and the knock portion The front end surface 20 a contacts the rear end surface 9 a of the fixed cam 9, and the spring receiving portion 22 fixed to the knock body 21 is separated from the front end 11 b of the rotating cam 11. At this time, the ballpoint pen refill 14 is pushed forward by the spring receiving portion 22 fixed to the knock body 21. However, at this time, the tip of the ballpoint pen tip 12 of the ballpoint pen refill 14 does not protrude from the tip opening 3 of the tip cylinder 2a.

  As shown in FIG. 4, when the knock portion 20 is further pressed, the fixed cam 9 and the rotating cam 11 pressed by the fixed cam 9 are advanced along the cam groove 7 by being pressed by the knock body 21, and the ballpoint pen tip. The tip portion of 12 protrudes from the tip opening 3 of the tip cylinder 2a.

  Since the rotary cam 11 is pressed rearward by the second compression coil spring 23, the rotary cam 11 is provided on the fixed cam 9 apart from the cam groove 7 as in the conventional knock type writing instrument. The cam 8 and the rotating cam 11 are rotated with respect to the fixed cam 9 and retracted by the action of the cam receiving portion 10 meshing with the cam 8 and the inclined surface (not shown) of the tip of the cam groove 7 As shown in FIG. 5, the state where the tip of the ball-point pen tip 12 protrudes from the tip opening 3 of the tip cylinder 2a is maintained by being locked to a locking portion (not shown) of the cam groove 7. At this time, the sound generated when the rotating cam 11 is locked to the locking portion (not shown) of the cam groove 7 is more elastic by the second compression coil spring 23 than the first compression coil spring 16. Therefore, the contact force of the rotating cam 11 to the locking portion of the cam groove 7 is also reduced and smaller than that of the conventional knock type writing instrument.

  When the pressure on the knock body 21 is released, the knock body 21 is always urged rearward via the ball pen refill 14 by the first compression coil spring 16 that urges the ball pen refill 14 backward. Retreats, and the spring receiving portion 22 fixed to the knock body 21 comes into contact with the front end 11 b of the rotary cam 11. Therefore, the knock body does not rattle.

  In order to immerse the tip of the ball-point pen tip 12 from the tip opening 3 of the tip cylinder 2a, the knock cam 21 is pressed again and the rotary cam 11 is slightly advanced and rotated, as in the conventional knock-type feeding mechanism. When the locking with the locking portion (not shown) of the cam groove 7 of the rotating cam 11 is released, the rotating cam 11 is pressed backward by the second compression coil spring 23. The cam 11 slides backward and comes into contact with the fixed cam 9. As described above, since the second compression coil spring 23 has a small elastic force, the contact force of the rotating cam 11 to the fixed cam 9 is weak, and the contact sound generated at that time is also small. When the pressure on the knock body 21 is released, the first compression coil spring 16 causes the spring receiving portion 22 of the knock body 21 to abut against the front end surface 11b of the rotary cam 11, and the rotary cam 11, the fixed cam 9, and the knock body 21. Are moved backward, and each returns to its original position. The impact sound generated when the spring receiving portion 22 of the knock body 21 comes into contact with the front end surface 11b of the rotary cam 11 is not affected by the elastic force of the first compression coil spring 16 as it is, and the second compression coil spring. Since it is weakened by the resilience of 23, it is reduced.

  The present invention provides a knock-type writing instrument such as a ballpoint pen or a marker having a knock-type feeding mechanism including a cam groove, a knock body, a rotating cam, and a fixed cam formed on the inner wall surface of the shaft cylinder. This can be used when it is desired to eliminate the “knocking of the knocking body” or when it is desired to reduce the knocking sound generated during the knocking operation.

It is a longitudinal cross-sectional view of the knock type ball-point pen of a present Example. It is an enlarged view of the principal part in FIG. It is the figure which showed the operation | movement in the knock type ball-point pen of a present Example, and showed the initial state which pressed the knock body. It is the figure which showed the operation | movement in the knock type ball-point pen of a present Example, and showed the state which the writing front-end | tip part of the writing body protruded from the front-end | tip opening part of the axial cylinder. In the knock type ball-point pen of a present Example, it is the figure which showed the state which maintained the state which the writing front-end | tip part of the writing body protruded from the front-end | tip opening part of the axial cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Knock type ball-point pen 2 Shaft cylinder 2a Mouth end cylinder 3 Tip opening part 7 Cam groove 8 Cam 9 Fixed cam 10 Cam receiving part 11 Rotating cam 12 Ball-point pen tip 14 Ball-point pen refill 16 First compression coil spring 16 Spring receiving part 19 Rod-shaped part 20 Knock part 21 Knock body 22 Spring receiving part 23 Second compression coil spring

Claims (1)

  The writing tip of the writing body accommodated by being biased rearward by a spring in the shaft tube is provided with a cam groove, and the tip is slidably disposed back and forth along the cam groove. The end opening portion of the shaft cylinder includes a fixed cam having a cam-shaped cam, a rotating cam having a cam receiving portion that meshes with the cam, and a knock-type feeding mechanism that includes a knock body for pressing the fixed cam. A knock-type writing instrument that protrudes and retracts, wherein the knock body is composed of a rod-shaped shaft portion and a knock portion having an outer diameter larger than the outer diameter of the rod-shaped shaft portion, and the rod-shaped shaft portion is a fixed cam and a rotating cam. The knock portion is positioned behind the fixed cam so that at least a part of the knock portion protrudes outward from the rear end of the shaft tube, and is positioned forward of the rotating cam. A spring receiving part is provided on the rod-shaped shaft part at the position, and the spring receiving part is provided at the rear end of the cursive body. A second spring having a spring force that is weaker than the spring force of the spring that urges the writing body backward by contacting one end with the spring receiving portion and the other end against the inner wall surface of the rotating cam; The spring receiving portion pressed rearward through the body is brought into contact with the rotating cam, the front end surface of the knock portion is separated from the rear end surface of the fixed cam, and the front end surface of the knock portion is fixed to the fixed cam by a knock operation on the knock body. A knock-type writing instrument, wherein the knock body advances the fixed cam and the rotating cam in a state where the spring receiving portion is in contact with the rear end surface and the spring receiving portion is separated from the rotating cam.

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