JP2018192660A - Thermochromic writing instrument - Google Patents

Abstract

To provide a thermochromic writing instrument of which the friction part is possible to be operated whether the pen tip is in a protruding or immersed state while the friction part can be prevented from getting dirty when not in use.SOLUTION: On the top of the friction body 4 is formed an in-out hole 42 opening at the back part, a protection part 6 which gets in or out freely is provided from the in-out hole 42, and the protection part 6 is continuously provided on the operating body 5. When the pen tip is in an immersed state, the back end part of the protection part 6 protrudes even farther backward than the tip of the friction body 4, and when the pen tip is in a protruding state, the back end part of the protection part 6 immerses inside the in-out hole 42 of the friction body 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a thermochromic writing instrument.

Conventionally, in Patent Document 1, in a thermochromic writing instrument, when not in use, the user's fingertip comes into contact with a friction body, or the thermochromic writing instrument is stored in a storage body (for example, a pen case, a pen stand, or a clothes pocket). The inner surface of the container (for example, the inner surface of the pen case, the bottom surface of the pen stand, or the inner surface of the pocket of clothes) and the friction body come into contact with each other. For the purpose of preventing dirt and dust from adhering to the surface and soiling the friction body surface, the cursive body is accommodated inside the shaft cylinder so as to be movable in the front-rear direction, and the thermochromic ink is accommodated inside the cursive body. A pen point capable of ejecting the thermochromic ink is provided at the front end of the cursive body, and an operation unit movable in the front-rear direction is projected on a side wall of the shaft cylinder, and the operation unit is slid forward. The curb pen tip A low-abrasion elastic material that can be projected and retracted from the front end hole of the cylinder, and can rub the handwriting of the thermochromic ink behind the rear end of the shaft cylinder and thermally change the handwriting with frictional heat generated at that time. A thermochromic writing instrument with a friction body made of protruding, comprising a protective piece portion that moves in the front-rear direction integrally with the operation portion at the rear end of the operation portion, and when the pen tip is immersed, the protective piece portion The rear end of the friction body is positioned behind the protrusion top of the friction body, and the protection piece is positioned at least on one side outer periphery of the protrusion of the friction body. There is disclosed a thermochromic writing instrument which is located behind the rear end of the protective piece portion and the protective piece portion is located at least on one side outer periphery of the rear end portion of the shaft tube.

JP 2014-128929 A

The thermochromic writing instrument of Patent Document 1 can perform a friction operation using a friction body in the pen tip protruding state, but in the pen tip immersion state, the rear end of the protective piece is behind the protrusion top of the friction member. The friction operation using the friction body located at the position cannot be easily performed.

The present invention solves the above-mentioned conventional problems, and can prevent the friction body from becoming dirty when not in use, and can also be used to perform a friction operation using the friction body in either the pen tip protruding state or the pen tip immersion state. The present invention intends to provide a thermochromic writing instrument that can be used.

In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite friction body side.

According to a first aspect of the present application, a cursive body is accommodated in a shaft cylinder so as to be movable in the front-rear direction, a thermochromic ink is accommodated in the cursive body, and the thermochromic ink is disposed at a front end of the cursive body. An operation body movable in the front-rear direction is accommodated in the shaft tube, and an operation unit movable in the front-rear direction is projected on the side wall of the shaft tube. An operation unit, wherein the writing body is urged rearward by a projectile, and the pen tip of the writing body is pivoted by sliding the operation unit forward against the rear urging of the projectile It is constructed so as to be able to protrude and retract from the front end hole of the cylinder, and from the low-abrasion elastic material capable of rubbing the handwriting of the thermochromic ink at the rear end of the shaft cylinder and thermally changing the handwriting by frictional heat generated at that time A thermochromic writing instrument provided with a friction body comprising: a rear opening at the top of the friction body; A retracting hole is formed, and a protective part is provided so as to be able to protrude and retract from the retracting hole. The protective part is connected to the operation body, and in the pen tip immersion state, the rear end of the protective part is the top of the friction body. It is required that the rear end portion of the protection portion is immersed in the protrusion / retraction hole of the friction body in a state where the protrusion protrudes further rearward and the pen tip protrudes.

The thermochromic writing instrument according to the first aspect of the present invention can prevent the friction body from being soiled by the protective portion in a non-use state (pen tip immersion state). Further, according to the thermochromic writing instrument of the first invention, in the pen tip immersion state, the protective portion is moved forward by bringing the rear end portion of the protective portion into contact with the writing surface, and the friction body is used. Further, the friction operation can be performed, and further, in the pen tip protruding state, the top portion of the protection portion is immersed in the intrusion hole of the friction body, so that the friction operation using the friction body can be performed.

In addition, according to the first aspect, since the protective portion is connected to the operating body, wobbling of the protective portion in the radial direction can be suppressed, and the protective portion can be stably moved in the front-rear direction.

According to a second invention of the present application, in the thermochromic writing instrument according to the first invention, in the pen tip immersion state, a tangent line that is in contact with a rear end portion of the protection portion and a rear end portion of the friction body, and an axis line The angle formed is preferably set in the range of 45 degrees to 70 degrees.

In the thermochromic writing instrument according to the second aspect of the present invention, the protection portion is properly retracted by the writing surface, a smooth friction operation is possible, and proper protection of the friction body by the protection portion is achieved.

When the angle formed with the axis is less than 45 degrees, the amount of protrusion of the protective portion from the friction body increases, and during the friction operation, the protective portion is not properly retracted by the writing surface, and a smooth friction operation is performed. It may not be possible. If the angle formed with the axis exceeds 70 degrees, the amount of protrusion of the protection part from the friction body becomes small, and the effect of preventing the dirt on the friction body by the protection part may be reduced.

According to a third invention of the present application, in the thermochromic writing instrument of the first or second invention, the elastic force in the axial direction of the bullet itself is set higher than the weight of the entire thermochromic writing instrument. Is a requirement.

In the thermochromic writing instrument of the third invention, since the elastic force in the axial direction of the projectile itself is set higher than the weight of the entire thermochromic writing instrument, when not in use, the pen case, the pen case, Even if it is stored in a stand or a pocket of clothes, etc., the protector may cause the frictional material to become another article (for example, the outer surface of other writing instruments, the inner surface of a pen case, the bottom surface of a pen stand, or the inner surface of a clothes pocket) ) Can be avoided, and the frictional body can be prevented from being soiled when not in use (the pen tip is immersed and the protective portion protrudes).

If the frictional operation is performed on the writing surface with a force greater than the axial elastic force of the projectile body itself, the rear end of the protective part is immersed in the intrusion hole by the force of the friction operation, and is not used (the pen tip) The friction operation using the friction body is possible even in the case of the immersion and the protection portion protruding state.

A fourth invention of the present application is the thermochromic writing instrument according to any one of the first to third inventions, wherein the operation body is integrally provided continuously with a clip body extending in the front-rear direction and a rear portion of the clip body, and in the radial direction. A base that extends integrally with the base and extends forward from the base, the shaft that is housed in the shaft cylinder, and the protection that is integrally connected to the base and extends rearward from the base. The shaft portion and the protection portion are formed on the same axis, the clip body is the operation portion, and the base portion and the shaft portion are accommodated in the shaft cylinder so as to be movable in the front-rear direction, The retracting mechanism includes a cam portion formed in the shaft cylinder, a rotating member that engages with the cam portion and contacts the rear end of the writing body, and cam teeth that engage with the rotating member in the front-rear direction. It is a requirement to provide the shaft portion at the front end.

In the thermochromic writing instrument according to the fourth aspect of the invention, the operating body includes a clip main body extending in the front-rear direction, a base portion integrally connected to the rear portion of the clip main body and extending in the radial direction, and a base portion extending integrally therewith. A shaft portion that is provided and extends forward from the base portion and is accommodated in the shaft cylinder, and a protection portion that is integrally provided with the base portion and extends rearward from the base portion, and the shaft portion and the protection The parts are formed on the same axis, the clip body is the operation part, the base and the shaft are accommodated in the shaft cylinder so as to be movable in the front-rear direction, and the retracting mechanism is formed in the shaft cylinder. And a rotating member that engages with the cam portion and contacts the rear end of the writing body, and the shaft portion that has cam teeth at the front end that engage with the rotating member in the front-rear direction. To prevent wobbling in the radial direction when the protective part moves back and forth Can stable friction operation becomes possible.

The thermochromic writing instrument of the present invention can prevent the friction body from becoming dirty when not in use (the pen tip is immersed and the protection portion protrudes), and can be used in both the pen tip protruding state and the pen tip immersion state. The used friction operation becomes possible.

It is a longitudinal cross-sectional view which shows the time of non-use of the embodiment of the present invention (pen tip immersion state and protection part protruding state). It is a longitudinal cross-sectional view which shows the time of use of FIG. 1 (a pen point protrusion and a protection part immersion state). It is a side view of FIG. It is a front view of FIG. FIG. 3 is a side view of FIG. 2. It is a principal part enlarged view of FIG. FIG. 3 is an exploded view showing an operating body, a protection unit, a cylindrical body, a rotating member, a friction body, a rear shaft, and an intermediate shaft of FIGS. 1 and 2.

1 to 7 show an embodiment of the present invention.
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 an operation unit 54 that protrudes radially outward from the outer surface of the shaft tube 2. The operating body 5 partially accommodated in the shaft cylinder 2 and the operation portion 54 are slid forward so that the pen tip 31 of the writing body 3 can be projected and retracted from the front end hole 24 of the shaft cylinder 2. And a haunting mechanism.

The cursive body 3 includes a pen tip 31, an ink storage tube 32 in which the pen tip 31 is press-fitted and fixed to a front end opening, a thermochromic ink 34 filled in the ink storage tube 32, and the thermochromic color. And a follower 35 (for example, a high-viscosity fluid) that is filled at the rear end of the ink 34 and moves forward as the thermochromic ink 34 is consumed.

The nib 31 includes, for example, a configuration composed only of a metal ballpoint pen tip holding a ball rotatably at the front end, or a configuration composed of a synthetic resin nib holder holding the rear outer surface of the ballpoint pen tip. It is done. Further, a tail plug 33 having a vent hole through which the ink containing tube 32 and the outside can be vented is attached to the rear end opening of the ink containing tube 32. A spring that presses the ball at the front end forward is housed inside the nib 31. The spring includes a rod portion at a front end portion of a compression coil spring, and the front end of the rod portion is in contact with the rear surface of the ball. When not writing, the ball is brought into close contact with the inner surface of the front end edge portion of the front end of the ballpoint pen tip by the forward urging of the spring, thereby preventing ink leakage and ink evaporation from the front end of the pen tip 31.

The shaft cylinder 2 includes a tapered cylindrical front shaft 21, a cylindrical intermediate shaft 22 connected to the rear end portion of the front shaft 21, and a cylindrical shape connected to the rear end portion of the intermediate shaft 22. It consists of a rear shaft 23. A slide hole 25 extending in the front-rear direction is formed in the rear side wall of the shaft cylinder 2 (side walls of the rear shaft 23 and the intermediate shaft 22). A cam portion 27 is integrally formed on the inner surface of the shaft cylinder 2 (intermediate shaft 22).

A mounting hole 26 is provided through the rear end of the shaft cylinder 2 (the rear end of the rear shaft 23) in the front-rear direction. The friction body 4 made of an elastic material is press-fitted or fitted over the mounting hole 26. Thereby, the friction body 4 is fixed to the outer surface of the rear end of the rear shaft 23.

The friction body 4 protrudes rearward from the rear end of the shaft cylinder 2, and a protrusion 41 of the friction body 4 is formed at the rear end of the shaft cylinder 2. The top of the protruding portion 41 of the friction body 4 is formed in a convex curved shape, and an intrusion hole 42 opening rearward is formed at the top of the protruding portion 41 of the friction body 4. The in / out hole 42 is provided in the axial direction.

The operation body 5 also serves as a clip. The operating body 5 includes a clip main body 51 extending in the front-rear direction, a base portion 52 integrally connected to the rear portion of the clip main body 51 and extending in the radial direction, and integrally connected to the base portion 52 and forward of the base portion 52. And a protective portion 6 that is continuous with the base portion 52 and extends rearward from the base portion 52. The shaft portion 53 and the protection portion 6 are formed on the same axis. The operation body 5 is obtained by a molded body of synthetic resin (for example, polycarbonate resin). The clip main body 51 has a ball portion 51a protruding from the back surface. At the front end of the shaft portion 53, cam teeth that engage with the rotating member 7 are formed integrally or by attachment by another member.

In the present embodiment, the operating body 5 is provided on the shaft cylinder 2 so as to be able to move back and forth as compared with the case where the protection section 6 is guided only by the inner surface of the friction body 4 (or the inner surface of the intrusion hole 42). Is connected to the operating body 5, the wobbling in the radial direction of the protection portion 6 can be suppressed.

The protective part 6 is arranged so as to move in the front-rear direction in the intrusion hole 42 penetrating the top of the friction body 4. The protection part 6 is formed in a rod shape or a plate shape. The protective part 6 is formed integrally with the base part 52 of the operating body 5 or is continuously provided by attaching another member. The rear end of the protection part 6 has a convex curved surface shape and can be smoothly slid with respect to the paper surface.

The in / out mechanism is a side slide type in / out mechanism using a rotating cam mechanism. The retracting mechanism includes a cam portion 27 formed on the inner surface of the intermediate shaft 22, a rotating member 7 that engages with the cam portion 27 and abuts against the rear end of the writing body 3, engages with the rotating member 7, and The operation body 5 protrudes radially outward from the slide hole 25 and the elastic body 8 (for example, a compression coil spring) accommodated in the shaft cylinder 2 and biases the writing body 3 backward. The retracting mechanism of the present embodiment is a double knock type in which both the pen tip protruding operation and the pen tip retracting operation slide the operation unit 5 forward.

  The cam portion 27 includes a plurality of serrated cam teeth 27a projecting forward and a plurality of cam grooves 27b formed between the cam teeth 27a and extending in the front-rear direction. The rotating member 7 includes a plurality of (for example, four) protrusions 7 a extending in the longitudinal direction on the outer surface thereof, and the protrusions 7 a are engaged with the cam teeth 27 a of the cam portion 27 and the cam groove 27 b of the cam portion 27. Combined. Cam teeth 55 a that engage with the rear end of the protrusion 7 a of the rotating member 7 are integrally formed at the front end of the cylindrical body 55 attached to the shaft portion 53 of the operation body 5.

When the operation unit 54 is slid forward from the pen tip immersion state against the back biasing of the projectile 8, the rotating member 7 is moved forward by the cylindrical body 55 attached to the shaft 53 of the operation body 5. When pressed, the rotating member 7 presses the rear end of the writing body 3 forward, and the pen tip 31 protrudes outside from the front end hole 24. At this time, the rotating member 7 rotates with respect to the cam portion 27 by a certain angle by the contact between the cam teeth 55 a of the cylindrical body 55 attached to the shaft portion 53 and the protrusion 7 a of the rotating member 7. Thereby, the protrusion 7a of the rotating member 7 is engaged with the cam teeth 27a of the cam portion 27, and the pen tip protruding state is maintained. At the same time, the protection unit 6 moves forward with the forward movement of the operating body 5, and the rear end of the protection unit 6 is inserted into the friction body 4 through the intrusion hole 42. Thereby, it will be in a usable state (a writing possible state and a friction body usable state).

Next, when the operating portion 54 (clip body) is slid forward from the pen tip protruding state, the cylindrical body 55 attached to the shaft portion 53 of the operating body 5 presses the rotating member 7 forward, and the cylindrical body 55 The rotating member 7 rotates with respect to the cam portion 27 by a certain angle by the contact between the cam teeth 55 a and the protrusion 7 a of the rotating member 7. Accordingly, the engagement state between the protrusion 7a and the cam teeth 27a of the cam portion 27 is released, and the protrusion 7a is rearward along the cam groove 27b of the cam portion 27 due to the rearward biasing by the elastic body 8. Move to. As the rotating member 7 moves rearward, the writing body 3 and the operating body 5 move rearward, resulting in a pen tip immersion state.
At the same time, as the operating body 5 moves rearward, the protective part 6 moves rearward, and the rear end of the protective part 6 protrudes outside the friction body 4 from the retracting hole 42. Thereby, it will be in a non-use state (a writing non-use state and a friction body non-use state).

In the pen tip immersion state, it is preferable that an angle θ formed by a tangent line contacting the rear end portion of the protection unit 6 and the rear end portion of the friction body 4 and the axis is set in a range of 45 degrees to 70 degrees. . If the angle θ formed by the tangent and the axis is less than 45 degrees, the amount of protrusion of the protective part 6 from the friction body 4 increases, and the protective part 6 is properly retracted by the writing surface during the friction operation. There is a risk that smooth frictional operation cannot be performed. In addition, when the angle θ formed by the tangent and the axis exceeds 70 degrees, the amount of protrusion of the protective portion 6 from the friction body 4 decreases, and the protective effect of the friction body 4 due to the protective portion 6 may be reduced. is there.

In the present embodiment, the elastic material constituting the friction body 4 is preferably an elastic synthetic resin (rubber or elastomer), such as a silicone resin, an SBS resin (styrene-butadiene-styrene copolymer), or an SEBS resin. (Styrene-ethylene-butylene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like. The elastic synthetic resin constituting the friction body 4 is not a highly wearable elastic material (for example, an eraser) but a low wear elastic material that hardly generates wear debris (erasure debris) during friction. The friction body 4 may be provided at least on the outer surface of the rear end portion of the shaft cylinder 2, for example, the friction body 4 made of an elastic material on the outer surface of the rear end portion of the shaft cylinder 2 or the outer surface of the rear end portion of the rear shaft 23. Can be fixed by press-fitting, engagement, screwing, fitting, adhesion, two-color molding, or the like, or a configuration in which the entire shaft cylinder 2 or the entire rear shaft 23 is integrally formed of an elastic material.

The thermochromic writing instrument 1 of the present embodiment is not in use when the pen tip is immersed, because the rear end of the protective part 6 is located behind the top of the protrusion 41 of the friction body 4 (when the pen tip is not used). Avoid contact with the user's fingertips and contact between the top of the friction body 4 and the inner surface of the container (for example, the inner surface of the pen case, the bottom surface of the pen stand, or the inner surface of the clothes pocket). It is possible to prevent dirt, dust, etc. from adhering to the friction body 4 (that is, the friction body 4 is soiled).

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Front shaft 22 Intermediate shaft 23 Rear shaft 24 Front end hole 25 Slide hole 26 Mounting hole 27 Cam part 27a Cam tooth 27b Cam groove 3 Writing body 31 Pen tip 32 Ink storage pipe 33 Tail plug 34 Heat Discoloring ink 35 Follower 4 Friction body 41 Protruding part 42 Protruding hole 5 Operating body 51 Clip body 51a Ball part 52 Base part 53 Shaft part 54 Operating part 55 Cylindrical body 55a Cam tooth 6 Protective part 7 Rotating member 7a Projection 8 Elasticity Body θ Angle

Claims (4)

A cursive body is accommodated in the shaft cylinder so as to be movable in the front-rear direction, a thermochromic ink is accommodated in the cursive body, and a nib capable of discharging the thermochromic ink at the front end of the cursive body is provided. An operation body movable in the front-rear direction is accommodated in the shaft cylinder, and an operation section movable in the front-rear direction is projected on a side wall of the shaft cylinder, the operation body includes the operation section, and the writing body Is urged backward by the projectile, and the pen tip of the writing body can be projected and retracted from the front end hole of the shaft cylinder by sliding the operation unit forward against the rear urging of the projectile. A friction body made of a low-abrasion elastic material capable of thermally discoloring the handwriting by frictional heat generated by rubbing the handwriting of the thermochromic ink at the rear end of the shaft cylinder. A thermochromic writing instrument provided,
The top and bottom of the friction body is formed with an in / out hole that opens to the rear, a protective portion is provided through the in / out hole so that the intrusion can be freely made, and the protective portion is connected to the operating body,
In the pen tip immersion state, the rear end portion of the protection portion protrudes rearward from the top portion of the friction body,
The thermochromic writing instrument, wherein the rear end portion of the protection portion is immersed in the protrusion / desorption hole of the friction body in a pen tip protruding state. In the pen tip immersion state, an angle formed by an axis and a tangent line contacting a rear end portion of the protection portion and a rear end portion of the friction body is set in a range of 45 degrees to 70 degrees. Item 1. The thermochromic writing instrument according to Item 1. The thermochromic writing instrument according to claim 1 or 2, wherein the elastic force in the axial direction of the projectile itself is set to be higher than the weight of the entire thermochromic writing instrument. The operation body includes a clip main body extending in the front-rear direction, a base portion integrally connected to a rear portion of the clip main body and extending in a radial direction, a base portion integrally connected to the base portion, and extending forward from the base portion. The clip body includes a shaft portion accommodated in a cylinder and the protection portion integrally connected to the base portion and extending rearward from the base portion, wherein the shaft portion and the protection portion are formed on the same axis. And the base portion and the shaft portion are accommodated in the shaft cylinder so as to be movable in the front-rear direction, and the retracting mechanism is engaged with the cam portion and the cam portion formed in the shaft cylinder. And a rotating member that contacts the rear end of the cursive body, and the shaft portion having cam teeth that engage with the rotating member in the front-rear direction. The thermochromic writing instrument described in 1.

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