JP2018108669A - Thermochromic writing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermochromic writing tool which can perform a stable friction operation with use of a friction body in both of a pen point retraction state and a penpoint projection state, and in which it can be avoided that a pen point is erroneously made to a projection state due to careless pressing of a knock body during non-use.SOLUTION: A cross sectional shape of an internal surface of a rear end hole 22 in a barrel 2 is made to a non-circular shape. A regulation wall part 61, which can be inserted into the rear end hole 22, is formed on a side wall of a knock member 6. A cross sectional shape of an external surface of the regulation wall part 61 is made to a non-circular shape corresponding to a shape of the internal surface of the rear end hole 22. When the regulation wall part 61 is present in the rear end hole 22, an operation for pressing the knock member 6 forward becomes possible. When the regulation wall part 61 is positioned rearward with respect to an opening of the rear end hole 22, the knock member 6 becomes rotatable with respect to the barrel 2. In the state that a forward end of the regulation wall part 61 is brought into contact with an opening edge part of the rear end hole 22 in the barrel 2, forward movement of the knock member 6 is blocked.SELECTED DRAWING: Figure 4

Description

The present invention relates to a thermochromic writing instrument.

Conventionally, for example, in Patent Document 1, a thermochromic ink is accommodated in a cursive body, a pen tip capable of discharging the thermochromic ink is provided at a front end of the cursive body, and the cursive body is disposed in a shaft cylinder. And a knock body is provided at the rear end portion of the shaft cylinder, and the pen tip is projected from the front end hole of the shaft cylinder by pressing the knock body forward, and the knock is again A retracting mechanism for releasing the pen tip protruding state by pressing the body forward and immersing the pen tip into the shaft tube from the front end hole of the shaft tube; A friction body capable of thermally discoloring the thermochromic ink handwriting by frictional heat generated by rubbing the handwriting of the color-changing ink, and providing an engagement portion on the friction body and an engagement portion of the friction body; In the case of a friction operation using the friction body, Wherein the Kigakarigo portion engaging the engaged portion, thermochromic writing instrument is disclosed which is characterized by comprising preventing movement of the front-rear direction of the friction body against the barrel.

Further, in Patent Document 1, in the pen tip protruding state, the engaging portion of the friction body and the engaging portion of the shaft tube (groove extending in the circumferential direction of the L-shaped groove) are engaged, A configuration in which movement of the friction body in the front-rear direction is prevented is disclosed.

JP 2011-37087 A

The thermochromic writing instrument of Patent Document 1 prevents the friction body from moving in the front-rear direction when the pen tip protrudes, and does not consider blocking the friction body from moving in the front-rear direction in the pen tip immersion state. . For this reason, it is difficult to perform a stable friction operation using the friction body in the pen tip immersion state, and there is a possibility that the knock body may be inadvertently pressed when not in use to cause the pen tip to accidentally protrude.

The present invention solves the above-mentioned conventional problems, and enables stable friction operation using a friction body in any of the pen tip immersion state and the pen tip protruding state, and is not used. It is an object of the present invention to provide a thermochromic writing instrument capable of avoiding accidentally pressing a knock member sometimes to make the pen tip accidentally protrude.

In the present invention, “front” refers to the pen body side, and “rear” refers to the opposite side. In the present invention, the “pen nib immersive state” refers to a state in which the pen nib is immersed in the shaft cylinder, and the “pen nib protruding state” refers to a state in which the pen nib projects outward from the front end of the shaft cylinder. Say.

The thermochromic writing instrument 1 according to the first invention of the present application contains a thermochromic ink inside a writing body 3, and a pen tip 31 capable of discharging the thermochromic ink is provided at the front end of the writing body 3. The writing body 3 is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, the knock member 6 protrudes rearward from the rear end hole 22 of the shaft cylinder 2, and the knock member 6 is pressed forward. The pen tip 31 is made to protrude from the front end hole 21 of the shaft cylinder 2 and the knock member 6 is pressed forward again to release the pen tip protruding state, so that the pen tip 31 is pivoted from the front end hole 21 of the shaft cylinder 2. A retracting mechanism for bringing the tube 2 into an immersion state is provided, and the thermochromic ink handwriting is rubbed against the outer surface of the rear end portion of the knock member 6 by the frictional heat generated at that time. A thermochromic writing instrument provided with a discolorable friction portion 8,
A plurality of cam teeth 24 and cam grooves 25 extending in the front-rear direction are formed on the inner surface of the shaft cylinder 2 and arranged alternately along the circumferential direction, and the shaft cylinder is located behind the writing body 3. 2 and a rotating member 4 having a plurality of protrusions 41 that can be alternately engaged with the cam teeth 24 or the cam grooves 25, and the shaft cylinder 2 at the rear of the rotating member 4. And a plurality of cam projections 51 that rotate the rotating member 4 and that are engaged with the cam groove 25 on the inner surface of the shaft cylinder 2 so as to be movable back and forth. A cam member 5 having an engagement protrusion 52, a knock member 6 that presses the cam member 5 forward, and a resilient body 7 that biases the writing body 3 backward,
While making the cross-sectional shape of the inner surface of the opening of the rear end hole 22 of the shaft cylinder 2 non-circular,
A restriction wall 61 that can be inserted into the rear end hole 22 is formed on the side wall of the knock member 6, and the cross-sectional shape of the outer surface of the restriction wall 61 corresponds to the shape of the inner surface of the rear end hole 22. Non-circular,
When the restriction wall portion 61 of the knock member 6 is in the rear end hole 22, the knock member 6 can be pushed forward.
When the restriction wall portion 61 of the knock member 6 is positioned behind the opening of the rear end hole 22, the knock member 6 can rotate with respect to the shaft cylinder 2,
When the knock member 6 is rotated with respect to the shaft cylinder 2 and the front end of the restriction wall portion 61 of the knock member 6 is in contact with the opening edge of the rear end hole 22 of the shaft cylinder 2, It is a requirement that the forward movement of the knock member 6 is prevented.

The thermochromic writing instrument 1 according to the first invention of the present application is capable of performing a stable friction operation using a friction body, regardless of whether the pen nib is in the pen tip immersive state or the pen nib protruding state. It is possible to avoid accidentally pressing the knock member 6 when not in use and accidentally causing the pen tip 31 to protrude.

The thermochromic writing instrument 1 according to the second invention of the present application is the thermochromic writing instrument 1 according to the first invention of the present application, wherein the knock member 6 is urged forward with respect to the shaft tube 2, and The restriction wall portion 61 of the knock member 6 is required to be disposed in the rear end hole 22 so as to be movable in the front-rear direction.

In the thermochromic writing instrument 1 according to the second invention of the present application, the restriction wall portion 61 is always disposed in the rear end hole 22 at the time of normal writing use (at the time of non-friction operation) due to the above-described configuration. In addition to when the friction operation is performed using the friction portion 8, the front end of the restriction wall portion 61 is inadvertently positioned behind the opening edge portion of the rear end hole 22, and the front end and the rear end of the restriction wall portion 61 of the knock member 6. It can avoid that the opening edge part of the end hole 22 contact | abuts.

The thermochromic writing instrument of the present invention is capable of stable friction operation using a friction body in either the pen tip immersing state or the pen tip protruding state, and inadvertently pressing the knock member when not in use. Thus, the pen tip can be prevented from accidentally protruding.

It is a longitudinal cross-sectional view which shows the pen tip immersion state at the time of the non-friction operation of embodiment of this invention. It is a principal part expanded longitudinal cross-sectional view of FIG. It is a longitudinal cross-sectional view which shows the pen tip immersion state at the time of the friction operation of FIG. FIG. 4 is an enlarged vertical cross-sectional view of a main part of FIG. 3. It is a longitudinal cross-sectional view which shows the pen tip protrusion state at the time of the non-friction operation of FIG. FIG. 6 is an enlarged vertical sectional view of a main part of FIG. 5. It is a longitudinal cross-sectional view which shows the pen tip protrusion state at the time of the friction operation of FIG. It is a principal part expanded longitudinal cross-sectional view of FIG. (A) is a principal part perspective view which shows the state which the knock member 6 of FIG. 1 can move to the front-back direction, (b) is the state by which the movement of the knock member 6 of FIG. It is a principal part perspective view shown. It is an exploded view which shows the intrusion mechanism of FIG.

An embodiment of a thermochromic writing instrument 1 of the present invention will be described with reference to the drawings. (See FIGS. 1 to 10)

The thermochromic writing instrument 1 of the present embodiment includes a shaft tube 2, a writing body 3 accommodated in the shaft tube 2, and a pen tip 31 of the writing body 3 that can be projected and retracted from a front end hole 21 of the shaft tube 2. And a haunting mechanism. The shaft cylinder 2 includes a cylindrical front shaft 2a, a cylindrical intermediate shaft 2b connected to the rear end of the front shaft 2a, and a cylindrical rear shaft 2c connected to the rear end of the intermediate shaft 2b. It consists of.

The front shaft front shaft 2a is a molded body of a synthetic resin having a tapered cylindrical shape. A front end hole 2131 is provided through the front end of the front shaft 2a in the front-rear direction. A grip portion made of an elastic material is formed on the side surface of the front shaft 2a. A male screw part is integrally formed on the outer surface of the rear end opening of the front shaft 2a.

Intermediate shaft The intermediate shaft 2b is a cylindrical synthetic resin molded body. A cam portion is integrally formed on the inner surface of the intermediate shaft 2b. A step portion 23 is formed on the inner surface of the rear end opening of the intermediate shaft 2b.

Rear shaft The rear shaft 2c is a cylindrical synthetic resin molded body. A rear end hole 22 is provided in the rear end of the rear shaft 2c in the front-rear direction. On the outer surface of the side wall of the rear shaft 2c, a clip extending in the front-rear direction capable of sandwiching the outer surface of the shaft tube 2 and a pocket or the like is provided. The clip is formed integrally with the outer surface of the side wall of the rear shaft 4, or is provided by attaching another member.

The cross-sectional shape of the inner surface of the rear end hole 22 of the rear shaft 2c has a regular hexagonal shape. The cross-sectional shape of the inner surface of the rear end hole 22 may be any shape as long as it is noncircular, for example, a regular polygon such as a regular triangle or a regular square, or an elliptical shape. .

The cursive writing body 3 includes a pen tip 31, an ink storage tube 32 in which the pen tip 31 is press-fitted and fixed to the opening of the front end, a thermochromic ink filled in the ink storage tube 32, and the thermal discoloration. And a follower (for example, a high-viscosity fluid) that is filled at the rear end of the ink and advances as the thermochromic ink is consumed.

For example, the pen tip 31 is composed of only a metal ball pen having a ball rotatably held at the front end, or a synthetic resin pen tip holder holding the rear outer surface of the ball pen tip. There may be. Further, a tail plug having a vent hole through which the ink containing tube 32 and the outside can be vented may be attached to the rear end opening of the ink containing tube 32.

The in / out mechanism (see FIG. 10) is a knock type in / out mechanism using a rotating cam mechanism, and is formed on the inner surface of the shaft cylinder 2 and extends in the front-rear direction alternately arranged along the circumferential direction. The cam teeth 24 and the cam grooves 25 are abutted against the rear end of the writing body 3 and are rotatably arranged with respect to the shaft cylinder 2, and can be alternately engaged with the cam teeth 24 or the cam grooves 25. A plurality of rotating members 4 having a plurality of protrusions 41, and a plurality of rotating members 4 disposed behind the rotating members 4 so as not to rotate with respect to the shaft tube 2 and to be movable in the front-rear direction. A cam member 5 having a cam projection 51 and a plurality of engagement projections 52 that are engaged with the cam groove 25 on the inner surface of the shaft cylinder 2 so as to move back and forth, and a knock member 6 that presses the cam member 5 forward. , A projectile 7 that biases the cursive 3 backward (example It consists a place compression coil spring). The retracting mechanism is a double knock type in which both the pen tip protruding operation and the pen tip retracting operation press the knock member 6 forward.

The rotating member rotating member 4 includes three protrusions 41 extending in the longitudinal direction on the outer surface, and the protrusions 41 are engaged with the cam grooves 25. The rotating member 4 is a cylindrical synthetic resin molded body. The rear end of the writing body 3 is always in contact with the inner wall of the rotating member 4.

Cam member The cam member 5 is a cylindrical synthetic resin molded body. An engaging protrusion 52 that slides in the cam groove 25 and a cam protrusion 51 that engages with the rear end of the protrusion 41 of the rotating member 4 are provided at the front end portion of the cam member 5.

-Knock member The knock member 6 is a cylindrical body, and includes a front cylinder part opening forward and a rear cylinder part opening backward. The rear end portion of the rotating member 4 is inserted into the opening of the front cylinder portion. On the outer surface of the front cylinder,
A locking wall portion 62 protruding outward in the radial direction is formed. The front end of the knock member elastic body 9 is locked to the locking wall portion 62. The friction part 8 made of an elastic material (for example, silicone resin, SBS resin, SEBS resin, etc.) is fixed to the opening of the rear cylinder part.

A regulating wall portion 61 that can be inserted into the rear end hole 22 is formed on the outer surface of the side wall of the knock member 6. The cross-sectional shape of the outer surface of the restriction wall portion 61 corresponds to the cross-sectional shape of the inner surface of the rear end hole 22 and has a regular hexagonal shape. The outer surface cross-sectional shape of the restriction wall 61 may be any shape as long as it is non-circular, and other than a hexagon, for example, a regular polygon such as a regular triangle or a regular square, or an elliptical shape. There may be. Further, the cross-sectional shape of the outer surface of the friction portion 8 corresponds to the cross-sectional shape of the inner surface of the rear end hole 22 and has a hexagonal shape. Thereby, the friction part 8 becomes a part of the regulation wall part 61 and can be inserted into the rear end hole 22. Since the cross-sectional shape of the outer surface of the restriction wall 61 is non-circular or polygonal, it is easy to pinch the restriction wall 61 with a finger and rotate it.

The knock member bullet member knock member 6 is biased forward by a knock member bullet member 9 (for example, a compression coil spring). The resilience of the knock member bullet 9 is set to be smaller than that of the bullet 7 that biases the writing body 3 backward. The front end of the knock member bullet 9 is locked to the locking wall 62 of the knock member 6, and the rear end of the knock member 9 is the rear end of the shaft cylinder 2 (rear shaft 2c). Locked to the inner wall. When the knock member 6 is biased forward of the knock member elastic body 9, the knock member 6 and the cam member 5 are always brought into contact with each other in the front-rear direction.

Operation of the regulating wall portion of the knock member FIGS. 1, 2, 5 and 6 show a state in which the knock member 6 can be pushed forward.
In this state, the restriction wall portion 61 is disposed in the rear end hole 22 so as to be movable in the front-rear direction. The pen tip 31 can be moved in and out.

3, 4, 7, and 8 show a state in which the forward pressing operation of the knock member 6 is prevented.
In this state, from the state of FIGS. 1, 2, 5, and 6, the knock member 6 is pulled backward against the shaft cylinder 2 against the rear bias of the knock member bullet 9. Obtained by rotating. In this state, the front end of the restriction wall portion 61 is brought into contact with the opening edge portion of the rear end hole 22, and the forward movement of the knock member 6 is prevented. Thereby, the stable friction operation using the friction part 8 is attained.

The thermochromic writing instrument 1 of the present embodiment accommodates thermochromic ink in the cursive body 3, and a pen tip 31 capable of discharging the thermochromic ink is provided at the front end of the cursive body 3. The body 3 is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, the knock member 6 protrudes rearward from the rear end hole 22 of the shaft cylinder 2, and the knock member 6 is pressed forward to thereby push the pen tip 31. Is made to protrude from the front end hole 21 of the shaft tube 2 and the knock member 6 is pressed forward again to release the pen tip protruding state, so that the pen tip 31 is moved into the shaft tube 2 from the front end hole 21 of the shaft tube 2. And an intrusion mechanism for bringing the thermochromic ink into a immersive state, and the thermochromic ink handwriting can be thermally discolored by frictional heat generated by rubbing the thermochromic ink handwriting on the outer surface of the rear end portion of the knock member 6 A thermochromic writing instrument provided with a friction portion 8, wherein the intrusion mechanism is A plurality of cam teeth 24 and cam grooves 25 that are formed on the inner surface of the shaft cylinder 2 and extend alternately in the circumferential direction, and rotate behind the writing body 3 with respect to the shaft cylinder 2. Rotating member 4 having a plurality of protrusions 41 that are arranged and can be alternately engaged with cam teeth 24 or cam grooves 25, and cannot rotate with respect to shaft cylinder 2 at the rear of rotating member 4. A plurality of engaging protrusions 52 that are arranged to be movable in the front-rear direction, have a plurality of cam protrusions 51 that rotate the rotating member 4, and are engaged with the cam grooves 25 on the inner surface of the shaft cylinder 2 so as to be movable back and forth. A cam member 5 that pushes the cam member 5 forward, and a resilient body 7 that urges the writing body 3 rearward, and a rear end hole 22 of the shaft cylinder 2. The cross section of the inner surface of the opening is non-circular and the knock A restriction wall 61 that can be inserted into the rear end hole 22 is formed on the side wall of the material 6, and the cross-sectional shape of the outer surface of the restriction wall 61 is a non-circular shape corresponding to the shape of the inner surface of the rear end hole 22. When the regulating wall portion 61 of the knock member 6 is in the rear end hole 22, the knock member 6 can be pushed forward, and the regulating wall portion 61 of the knock member 6 is When positioned behind the opening of the hole 22, the knock member 6 can rotate with respect to the shaft cylinder 2, the knock member 6 is rotated with respect to the shaft cylinder 2, and the knock member 6 When the front end of the restricting wall portion 61 is in contact with the opening edge of the rear end hole 22 of the shaft cylinder 2, forward movement of the knock member 6 is prevented.

The thermochromic writing instrument 1 of the present embodiment is capable of performing a stable friction operation using a friction body, regardless of whether the pen tip is in the pen tip immersion state or the pen tip protruding state. Moreover, it is possible to avoid accidentally pressing the knock member 6 when not in use and accidentally causing the pen tip 31 to protrude.

In the thermochromic writing instrument 1 of the present embodiment, the knock member 6 is urged forward with respect to the shaft tube 2, and the restriction wall portion 61 of the knock member 6 is movable in the front-rear direction. 22 is arranged. As a result, the restriction wall 61 is always disposed in the rear end hole 22 during normal writing use. Therefore, the restriction wall 61 is inadvertently used except when the friction operation is performed using the friction part 8. The front end is positioned behind the opening edge portion of the rear end hole 22, and it is possible to avoid contact between the front end of the restriction wall portion 61 of the knock member 6 and the opening edge portion of the rear end hole 22.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Front end hole 22 Rear end hole 23 Step part 24 Cam tooth 25 Cam groove 2a Front shaft 2b Intermediate shaft 2c Rear shaft 3 Writing body 31 Pen tip 32 Ink storage tube 4 Rotating member 41 Projection 5 Cam member 51 Cam projection 52 Engaging projection 6 Knock member 61 Restriction wall portion 62 Locking wall portion 7 Ejection body 8 Friction portion 9 Ejection body for knock member

Claims (2)

A thermochromic ink is accommodated inside the cursive body, a pen tip capable of ejecting the thermochromic ink is provided at the front end of the cursive body, and the cursive body is accommodated in the shaft cylinder so as to be movable in the front-rear direction. A knock member is projected rearward from the rear end hole of the shaft cylinder, and the pen tip is projected from the front end hole of the shaft cylinder by pressing the knock member forward, and the knock member is pressed forward again. The pen tip protruding state is released by the above-mentioned mechanism, and a pendulum mechanism is provided to immerse the pen tip into the shaft tube from the front end hole of the shaft tube. And a thermochromic writing instrument provided with a friction part capable of thermally changing the handwriting of the thermochromic ink with frictional heat generated at that time,
The protruding and retracting mechanism is formed on the inner surface of the shaft cylinder, and is rotated with respect to the shaft cylinder behind the writing body, and a plurality of cam teeth and cam grooves extending in the front-rear direction alternately arranged along the circumferential direction. A rotating member having a plurality of protrusions that can be alternately engaged with the cam teeth or the cam groove, and is not rotatable relative to the shaft cylinder and movable in the front-rear direction behind the rotating member. And a cam member having a plurality of cam projections for rotating the rotation member and having a plurality of engagement projections engaged with a cam groove on the inner surface of the shaft cylinder so as to move back and forth. A knock member that presses against the projectile, and a projectile that urges the writing body backward,
While making the cross-sectional shape of the opening inner surface of the rear end hole of the shaft cylinder a non-circular shape,
A restriction wall portion that can be inserted into the rear end hole is formed on the side wall of the knock member, and the cross-sectional shape of the outer surface of the restriction wall portion is a non-circular shape corresponding to the shape of the inner surface of the rear end hole,
When the restriction wall portion of the knock member is in the rear end hole, a pressing operation to the front of the knock member becomes possible.
When the restriction wall portion of the knock member is positioned behind the opening of the rear end hole, the knock member can rotate with respect to the shaft tube,
When the knock member is rotated with respect to the shaft cylinder and the front end of the restriction wall portion of the knock member is in contact with the opening edge of the rear end hole of the shaft cylinder, the knock member moves forward. A thermochromic writing instrument characterized in that 2. The thermochromic writing instrument according to claim 1, wherein the knock member is urged forward with respect to the shaft cylinder, and a restriction wall portion of the knock member is disposed in the rear end hole so as to be movable in the front-rear direction.

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