JP6845741B2 - Thermal discoloration writing tool - Google Patents

Description

The present invention relates to a thermochromic writing instrument.

Conventionally, Patent Document 1 describes that in a heat-discoloring writing tool, the user's fingertips come into contact with a friction body when not in use, or the heat-discoloring writing tool is stored in a storage body (for example, a pen case, a pen stand, or a pocket of clothes). Etc.), when the friction body comes into contact with the inner surface of the storage body (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 surface. In order to prevent hand stains and dust from adhering to the surface of the friction body and contaminating the surface of the friction body, the writing body is housed inside the barrel so that it can be moved in the front-rear direction, and the heat-discoloring ink is housed inside the writing body. A pen tip capable of ejecting the heat-discoloring ink is provided at the front end of the writing body, an operating portion movable in the front-rear direction is projected from the side wall of the barrel, and the operating portion is slid forward. The pen tip of the writing body is configured to be able to appear and disappear from the front end hole of the barrel, and the brush stroke of the heat-discoloring ink is rubbed behind the rear end of the barrel, and the frictional heat generated at that time heats the brush stroke. A heat-discolorable writing tool with a friction body made of a low-wear-resistant elastic material that can be discolored, and a protective piece that moves in the front-rear direction integrally with the operation unit is provided at the rear end of the operation unit. When the pen tip is immersed, the rear end of the protective piece is located behind the top of the protruding portion of the friction body, and the protective piece is located at least on the outer periphery of one side of the protruding portion of the friction body. A thermochromic writing tool characterized in that the top of the protruding portion of the friction body is located behind the rear end of the protective piece and the protective piece is located at least on the outer periphery of one side of the rear end of the barrel. It is disclosed.

Japanese Unexamined Patent Publication No. 2014-128929

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

The present invention solves the above-mentioned conventional problems, can prevent the friction body from becoming dirty when not in use, and can also perform a friction operation using the friction body in both the pen tip protruding state and the pen tip immersion state. It is intended to provide a thermochromic writing tool capable of.

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

According to the first invention of the present application, a cursive is housed inside a cursive so as to be movable in the front-rear direction, a heat-discoloring ink is housed inside the cursive, and the heat-changing ink is stored at the front end of the cursive. Is provided with a pen tip capable of ejecting, and an operating body that can move in the front-rear direction is housed inside the barrel, and an operating portion that can move in the front-rear direction protrudes from the side wall of the barrel. The cursive is provided with an operation unit, and the cursive is urged rearward by the projectile, and the operation unit is slid forward against the rearward urging of the cursive to axis the pen tip of the cursive. From a low-wear elastic material that is configured to be able to appear and disappear from the front end hole of the cylinder, and the brush stroke of the heat-discolorable ink is rubbed against the rear end of the shaft cylinder, and the brush stroke can be thermally discolored by the frictional heat generated at that time. A heat-discoloring cursive having a friction body, the top of the friction body is formed with an infestation hole that opens rearward, and a protective portion is provided so as to be able to appear and disappear from the infestation hole. It is connected to the body, and in the pen tip immersion state, the rear end portion of the protective portion protrudes rearward from the top of the friction body, and in the pen tip protrusion state, the rear end portion of the protection portion appears and disappears of the friction body. It is required to be immersed inside the hole.

The thermochromic writing tool of the first 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 was moved forward by bringing the rear end portion of the protective portion into contact with the writing surface, and a friction body was used. A friction operation is possible, and further, since the top of the protective portion is immersed in the indentation hole of the friction body in the pen tip protruding state, the friction operation using the friction body becomes possible.

Further, according to the first invention, since the protective portion is continuously provided to the operating body, it is possible to suppress the wobbling of the protective portion in the radial direction, and the protective portion can be stably moved in the front-rear direction.

The second invention of the present application is the thermochromic writing tool of the first invention, in which the tangent line in contact with the rear end portion of the protective portion and the rear end portion of the friction body in the pen tip immersion state, and the axis line. The angle of formation is preferably set in the range of 45 degrees to 70 degrees.

In the heat-discolorable writing tool of the second invention, the protective portion is properly retracted by the writing surface, smooth friction operation is possible, and the protective portion properly prevents the friction body from being soiled.

If the angle formed by the axis is less than 45 degrees, the amount of protrusion of the protective portion from the friction body becomes large, and during the friction operation, the protective portion is not properly retracted by the writing surface, and smooth friction operation is performed. It may not be possible. Further, if the angle formed by the axis exceeds 70 degrees, the amount of protrusion of the protective portion from the friction body becomes small, and the effect of the protective portion on preventing the friction body from becoming dirty may be reduced.

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

The thermochromic writing tool of the third invention has a pen case and a pen when not in use because the axial elasticity of the elastic body itself is set higher than the weight of the entire thermochromic writing tool. Even if it is stored in a stand or in a pocket of clothes, the protective part causes the friction body to be removed from other items (for example, the outer surface of other writing tools, the inner surface of the pen case, the bottom surface of the pen stand, or the inner surface of the pocket of clothes, etc. ) Is avoided, and the friction body can be prevented from becoming dirty when not in use (the pen tip is immersed and the protective portion is projected).

If the friction operation is performed on the writing surface with a force equal to or greater than the elastic force in the axial direction of the elastic body itself, the rear end portion of the protective portion is immersed in the indentation hole by the force of the friction operation, and is in an unused state (pen tip). Even in the immersive and protruding state of the protective portion), the friction operation using the friction body becomes possible.

A fourth aspect of the present application is the thermochromic writing tool of the first to third aspects, wherein the operating body is integrally provided with a clip body extending in the front-rear direction and a rear portion of the clip body, and is radially connected. And the shaft portion that is integrally connected to the base portion and extends forward from the base portion and is housed in the barrel, and the protection that is integrally connected to the base portion and extends rearward from the base portion. The shaft portion and the protection portion are formed on the same axis line, the clip body is used as the operation portion, and the base portion and the shaft portion are housed in the shaft cylinder so as to be movable in the front-rear direction. A cam portion formed in the barrel, a rotating member that engages with the cam portion and abuts on the rear end of the writing body, and a cam tooth that engages with the rotating member in the front-rear direction. It is a requirement that the shaft portion provided at the front end is provided.

In the thermochromic writing tool of the fourth invention, the operating body is integrally connected to a clip body extending in the front-rear direction, a base integrally connected to the rear portion of the clip body and extending in the radial direction, and the base portion. It is composed of a shaft portion provided and extending forward from the base portion and housed in the shaft cylinder, and the protective portion integrally provided with the base portion and extending rearward from the base portion, and the shaft portion and the protection portion. The portions are formed on the same axis, the clip body is used as the operation portion, the base portion and the shaft portion are housed in the shaft cylinder so as to be movable in the front-rear direction, and the infestation mechanism is formed in the shaft cylinder. A cam portion to be formed, a rotating member that engages with the cam portion and abuts on the rear end of the writing body, and a shaft portion having a cam tooth that engages with the rotating member in the front-rear direction at the front end. Therefore, it is possible to suppress the wobbling in the radial direction when the protective portion moves back and forth, and stable friction operation becomes possible.

The thermochromic writing tool of the present invention can prevent the friction body from becoming dirty when not in use (the pen tip is immersed and the protective portion is projected), and the friction body can be removed in either the pen tip protruding state or the pen tip immersion state. The friction operation used becomes possible.

It is a vertical cross-sectional view which shows when the embodiment of this invention is not used (the pen tip is immersive and the protection part is protruding state). FIG. 3 is a vertical cross-sectional view showing the state of use of FIG. 1 (pen tip protruding and protective portion immersed state). It is a side view of FIG. It is a front view of FIG. It is a side view of FIG. It is an enlarged view of the main part of FIG. It is an exploded view which shows the operation body, the protection part, the cylindrical body, the rotating member, the friction body, the rear shaft, and the intermediate shaft of FIGS. 1 and 2.

1 to 7 show embodiments of the present invention.
The thermochromic writing instrument 1 of the present embodiment includes a shaft cylinder 2, a cursive body 3 housed in the shaft cylinder 2, and an operation unit 54 protruding outward in the radial direction from the outer surface of the shaft cylinder 2. By sliding the operating body 5 partially housed in the barrel 2 and the operating portion 54 forward, the pen tip 31 of the cursive 3 is made to appear and disappear from the front end hole 24 of the barrel 2. It is equipped with a haunting mechanism.

The cursive 3 includes a pen tip 31, an ink accommodating tube 32 in which the pen tip 31 is press-fitted and fixed to a front end opening, a heat-discoloring ink 34 filled in the ink accommodating tube 32, and the thermal discoloration. It is composed of a follower 35 (for example, a high-viscosity fluid) that is filled in the rear end of the sex ink 34 and advances with consumption of the heat-discoloring ink 34.

The pen tip 31 may include, for example, only a metal ballpoint pen tip that rotatably holds a ball at the front end, or a synthetic resin pen tip holder that holds the rear outer surface of the ballpoint pen tip. Be done. Further, a tail plug 33 having a ventilation hole through which the ink storage tube 32 and the outside can be ventilated is attached to the rear end opening of the ink storage tube 32. Inside the pen tip 31, a spring that presses the ball at the front end forward is housed. The spring has a configuration in which a rod portion is provided at the front end portion of the compression coil spring, and the front end portion 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 inwardly facing front end edge of the front end of the ballpoint pen tip by the forward urging of the spring, and ink leakage and ink evaporation from the front end of the pen tip 31 can be prevented.

The axle tube 2 has 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 intermediate shaft 22 connected to the rear end portion of the intermediate shaft 22. It is composed of a rear shaft 23. A slide hole 25 extending in the front-rear direction is formed on the rear side wall of the barrel 2 (the side wall 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 formed in the rear end of the shaft cylinder 2 (rear end of the rear shaft 23) in the front-rear direction. A friction body 4 made of an elastic material is press-fitted or over-fitted into the mounting hole 26. As a result, the friction body 4 is fixed to the outer surface of the rear end of the rear shaft 23.

The friction body 4 projects rearward from the rear end of the shaft cylinder 2, and a protruding portion 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 surface shape, and a protrusion / recess hole 42 that opens rearward is formed at the top of the protruding portion 41 of the friction body 4. The infestation hole 42 is penetrated in the axial direction.

The operating 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 a base portion 52 integrally connected to the base portion 52 and in front of the base portion 52. It is composed of a shaft portion 53 extending to the base portion 53 and a protective portion 6 integrally provided with the base portion 52 and extending rearward from the base portion 52. The shaft portion 53 and the protection portion 6 are formed on the same axis. The operating body 5 is obtained by molding a synthetic resin (for example, a polycarbonate resin). The clip body 51 has a ball portion 51a projecting from the back surface. At the front end of the shaft portion 53, a cam tooth that engages with the rotating member 7 is formed by being integrally attached or attached by a separate member.

In the present embodiment, the operating body 5 is provided on the barrel 2 so as to be movable back and forth as compared with the case where the protective portion 6 is guided only on the inner surface of the friction body 4 (or the inner surface of the indentation hole 42), and the protective portion 6 is provided. Is connected to the operating body 5, so that the wobbling of the protective portion 6 in the radial direction can be suppressed.

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

The infestation mechanism is a side slide type infestation mechanism using a rotary cam mechanism. The infestation mechanism engages with 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 on the rear end of the cursive 3, and engages with the rotating member 7. It includes an operating body 5 that protrudes outward in the radial direction from the slide hole 25, and an elastic body 8 (for example, a compression coil spring) that is housed in the barrel 2 and urges the cursive 3 rearward. The infestation mechanism of the present embodiment is a double knock type in which both the pen tip protrusion operation and the pen tip immersion operation slide the operation unit 5 forward.

The cam portion 27 includes a plurality of sawtooth-shaped 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 is provided with a plurality of (for example, four) ridges 7a extending in the longitudinal direction on the outer surface thereof, and the ridges 7a engage with the cam teeth 27a of the cam portion 27 and the cam groove 27b of the cam portion 27. Will be combined. A cam tooth 55a that engages with the rear end of the ridge 7a of the rotating member 7 is integrally formed at the front end of the cylindrical body 55 attached to the shaft portion 53 of the operating body 5.

When the operation unit 54 is slid forward from the pen tip immersion state against the rearward bias by the elastic body 8, the rotating member 7 is moved forward by the cylindrical body 55 attached to the shaft portion 53 of the operation body 5. When pressed, the rotating member 7 presses the rear end of the cursive body 3 forward, and the pen tip 31 projects outward from the front end hole 24. At this time, the rotating member 7 rotates by a certain angle with respect to the cam portion 27 due to the contact between the cam teeth 55a of the cylindrical body 55 attached to the shaft portion 53 and the ridges 7a of the rotating member 7. As a result, the ridges 7a of the rotating member 7 are engaged with the cam teeth 27a of the cam portion 27, and the pen tip protruding state is maintained. At the same time, the protective portion 6 moves forward as the operating body 5 moves forward, and the rear end of the protective portion 6 is immersed in the friction body 4 through the indentation hole 42. As a result, it becomes a usable state (a writable 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 by a certain angle with respect to the cam portion 27 due to the contact between the cam tooth 55a and the ridge 7a of the rotating member 7. As a result, the engagement state between the ridge 7a and the cam tooth 27a of the cam portion 27 is released, and the ridge 7a is rearward along the cam groove 27b of the cam portion 27 due to the rearward bias by the elastic body 8. Move to. As the rotating member 7 moves backward, the cursive 3 and the operating body 5 move backward, and the pen tip is immersed.
At the same time, the protective portion 6 moves rearward as the operating body 5 moves backward, and the rear end of the protective portion 6 protrudes from the infestation hole 42 to the outside of the friction body 4. As a result, it becomes a non-use state (writing non-use state and friction body non-use state).

In the pen tip immersion state, it is preferable that the angle θ formed by the tangent line in contact with the rear end portion of the protective portion 6 and the rear end portion of the friction body 4 and the axis line is set in the range of 45 degrees to 70 degrees. .. When the angle θ formed by the tangent line and the axis line is less than 45 degrees, the amount of protrusion of the protective portion 6 from the friction body 4 becomes large, and the protective portion 6 is properly retracted by the writing surface during the friction operation. There is a risk that smooth friction operation will not be possible. Further, if the angle θ formed by the tangent line and the axis line exceeds 70 degrees, the amount of protrusion of the protective portion 6 from the friction body 4 becomes small, and the effect of the protective portion 6 on preventing the friction body 4 from becoming dirty may be reduced. is there.

In the present embodiment, the elastic material constituting the friction body 4 is preferably a synthetic resin (rubber, elastomer) having elasticity, for example, a silicone resin, an SBS resin (styrene-butadiene-styrene copolymer), or a SEBS resin. (Stylus-ethylene-butylene-styrene copolymer), fluororesin, chloroprene resin, nitrile resin, polyester resin, ethylenepropylene diene rubber (EPDM) and the like can be mentioned. The elastic synthetic resin constituting the friction body 4 is not a highly wear-resistant elastic material (for example, an eraser or the like), but a low-wear elastic material in which almost no wear residue (eraser) is generated during friction. Further, the friction body 4 may be provided at least on the outer surface of the rear end portion of the barrel 2, for example, the friction body 4 made of an elastic material on the outer surface of the rear end portion of the barrel 2 or the outer surface of the rear end portion of the rear shaft 23. There is a configuration in which the shaft is fixed by press fitting, engagement, screwing, fitting, bonding, 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 tool 1 of the present embodiment is not used (the pen tip is not used) because the rear end of the protective portion 6 is located behind the top of the protruding portion 41 of the friction body 4 when the pen tip is immersed. Avoid contact with the user's fingertips (when and when the friction body is not used), and contact between the top of the friction body 4 and the inner surface of the housing (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). This makes it possible to prevent hand stains, dust, and the like from adhering to the friction body 4 (that is, the friction body 4 becomes dirty).

1 Thermal discoloration writing tool 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 tube 33 Tail plug 34 Heat Discoloration ink 35 Follow-up body 4 Friction body 41 Protruding part 42 Protrusion hole 5 Operation body 51 Clip body 51a Ball part 52 Base part 53 Shaft part 54 Operation part 55 Cylindrical body 55a Cam tooth 6 Protective part 7 Rotating member 7a Lump 8 Body θ angle

Claims (4)

The cursive is housed inside the cursive so as to be movable in the front-rear direction, the heat-discoloring ink is housed inside the writing body, and the front end of the writing body is provided with a pen tip capable of ejecting the heat-changing ink. An operating body that can move in the front-rear direction is housed inside the barrel, and an operating unit that can move in the front-rear direction is projected from the side wall of the barrel. The operating body is provided with the operating unit, and the cursive is provided. Is urged backward by the elastic body, and the pen tip of the cursive can be retracted from the front end hole of the barrel by sliding the operation unit forward against the backward urging of the elastic body. A friction body made of a low-wear elastic material capable of thermally discoloring the cursive by rubbing the cursive of the heat-discoloring ink on the rear end of the barrel and the frictional heat generated at that time. It is a heat-discoloring writing tool equipped with
A recessed hole that opens rearward is formed at the top of the friction body, a protective portion is provided so as to be freely retractable from the recessed hole, and the protected portion is continuously provided to the operating body.
In the pen tip immersion state, the rear end portion of the protective portion is projected rearward from the top portion of the friction body.
A heat-discolorable writing tool, wherein the rear end portion of the protective portion is immersed in the indentation hole of the friction body in a pen tip protruding state. In the pen tip immersion state, the angle between the tangent line in contact with the rear end portion of the protective portion and the rear end portion of the friction body and the axis is set in the range of 45 degrees to 70 degrees. Item 1. The thermochromic writing tool according to item 1. The thermochromic writing tool according to claim 1 or 2, wherein the elastic force in the axial direction of the elastic body itself is set higher than the weight of the entire thermochromic writing tool. The operating body includes a clip body that extends in the front-rear direction, a base that is integrally connected to the rear portion of the clip body and extends in the radial direction, and a base that is integrally connected to the base and extends forward from the base. It is composed of a shaft portion housed in a cylinder and a protective portion that is integrally connected to the base portion and extends rearward from the base portion. The shaft portion and the protective portion are formed on the same axis, and the clip main body is formed. The base portion and the shaft portion are housed in the barrel so as to be movable in the front-rear direction, and the retracting mechanism engages with the cam portion formed in the barrel and the cam portion. Any one of claims 1 to 3, further comprising a rotating member that comes into contact with the rear end of the writing body and a shaft portion having a cam tooth that engages with the rotating member in the front and rear at the front end. The thermochromic writing tool described in.

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