JP6204663B2 - Thermochromic writing instrument - Google Patents

Description

The present invention relates to a thermochromic writing instrument. Specifically, the cursive body is accommodated in the shaft cylinder so as to be movable in the front-rear direction, and the pen tip of the cursive body is configured to be able to appear and retract from the front end hole of the shaft cylinder by sliding the operation unit forward. The present invention relates to a thermochromic writing instrument comprising a friction body capable of rubbing the handwriting of the thermochromic ink at the rear end of the cylinder and thermally discoloring the handwriting by frictional heat generated at that time.

Conventionally, in Patent Document 1, in a thermochromic writing instrument, a writing body containing a thermochromic ink is accommodated in a shaft cylinder, and an operation body provided on the shaft cylinder is operated to move the writing body forward and backward. The thermochromic writing tool is configured to move in the direction so that the pen tip of the writing body can be projected and retracted from the tip of the writing instrument, and the handwriting of the thermochromic ink is rubbed to heat the handwriting with frictional heat generated at that time. A discolorable friction portion and at least one clip body as the operation body are provided, and the friction portion is provided at a rear end of the shaft tube, and the clip body is provided at a portion other than the rear end of the shaft tube. A thermochromic writing instrument characterized by the above is disclosed.

Japanese Unexamined Patent Publication No. 2012-6315

In the thermochromic writing instrument of Patent Document 1, the friction body is always exposed to the outside. Therefore, when not in use, the user's fingertip comes into contact with the friction body, or when the thermochromic writing instrument is stored in a storage body (for example, a pen case, a pen stand, or a clothes pocket), the storage is performed. When the inner surface of the 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) contacts the friction body, dirt or dust adheres to the friction body surface, and the friction body surface becomes dirty. Further, when the paper surface is rubbed with the dirty friction body, the paper surface becomes dirty.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a thermochromic writing instrument that can prevent the friction body from becoming dirty when not in use.

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

1st invention of this application accommodates the writing body 3 in the axial cylinder 2 so that a movement in the front-back direction is possible, accommodates a thermochromic ink in the inside of the writing body 3, and the above-mentioned in the front end of the writing body 3 A pen nib 31 capable of discharging thermochromic ink is provided, and an operation unit 5 that can move in the front-rear direction is projected on the side wall of the shaft tube 2, and the operation unit 5 is slid forward to make the writing body 3. The pen tip 31 of the shaft cylinder 2 can be projected and retracted from the front end hole 23, and the handwriting of the thermochromic ink is rubbed behind the rear end of the shaft cylinder 2 to heat the handwriting with frictional heat generated at that time. A thermochromic writing instrument in which a friction body 4 made of a low-abrasion elastic material capable of changing color is projected, and a rear end hole 27 is penetrated in the front-rear direction on the outer periphery in the vicinity of the friction body 4 at the rear end of the shaft cylinder 2. The protective piece portion 6 is provided in the rear end hole 27 in a loosely inserted state, and the protective piece portion 6 is connected to the operation portion 5. The protective piece 6 protrudes rearward from the rear end hole 27 and the rear end of the protective piece 6 is rearward of the top of the protruding portion 41 of the friction body 4. When the pen tip protrudes, the protective piece portion 6 is greatly immersed forward from the rear end hole 27, and the top portion of the protruding portion 41 of the friction body 4 is located behind the rear end of the protective piece portion 6. Is a requirement.

In the thermochromic writing instrument 1 of the first invention of the present application, when the pen tip is immersed, the protective piece 6 protrudes rearward from the rear end hole 27 and the rear end of the protective piece 6 protrudes from the friction body 4. By being positioned behind the top of the portion 41, when not in use (when the pen tip is not used or when the friction body is not used), contact with the user's fingertips, or the friction body 4 and the inner surface of the container (for example, the inner surface of the pen case) Further, it is possible to avoid contact with the bottom surface of the pen stand or the inner surface of the pocket of the clothes), and it is possible to prevent dirt or dust from adhering to the friction body 4 (that is, the friction body 4 is soiled). In addition, the thermochromic writing instrument 1 of the present invention can simultaneously move the pen tip 31 and the friction body 4 by the operation of the operation unit 5, and is easy to operate and visually recognizes one of the protruding and protruding states. Only the infestation state on the opposite side can be identified. (For example, the pen tip appearance state can be identified by visually recognizing the protrusion state of the friction body 4. Alternatively, the protrusion state of the friction body 4 can be identified by visually confirming the protrusion state of the pen tip 31.)

According to a second invention of the present application, in the thermochromic writing instrument 1 of the first invention, a plurality of rear end holes 27 are provided in the front-rear direction on the outer periphery in the vicinity of the friction body 4 at the rear end of the shaft tube 2. It is a requirement that a plurality of protective piece portions 6 are provided in the rear end holes 27 in the loosely inserted state.

In the thermochromic writing instrument 1 according to the second aspect of the invention, a plurality of rear end holes 27 are provided in the front-rear direction on the outer periphery in the vicinity of the friction body 4 at the rear end of the shaft cylinder 2. By providing a plurality of protective piece portions 6 in the loosely inserted state, a plurality of protective piece portions 6 can be arranged so as to surround the outer periphery of the protruding portion 41 of the friction body 4, further preventing contamination of the friction body 4. it can.

According to a third invention of the present application, in the thermochromic writing instrument 1 of the second invention, a connecting wall portion 61 that connects the front ends of the respective protection piece portions 6 to each other is provided, and the connecting wall portion 61 is connected to the rear end. It is a requirement that the shaft cylinder 2 is accommodated in front of the hole 27.

The thermochromic writing instrument 1 according to the third aspect of the present invention is provided with a connecting wall portion 61 that connects the front ends of the respective protection piece portions 6 to each other, and the connecting tube portion 61 is located in front of the rear end hole 27. By accommodating in the inside, it can prevent that each protection piece part 6 falls out from the rear-end hole 27. FIG.

The thermochromic writing instrument of the present invention can prevent the friction body from becoming dirty when not in use.

It is a longitudinal cross-sectional view which shows the time of non-use of embodiment of this invention. It is a principal part expanded longitudinal cross-sectional view of FIG. It is an AA arrow directional view of FIG. 2 (however, an operation part is abbreviate | omitted). It is a longitudinal cross-sectional view at the time of use of FIG. It is a principal part expanded longitudinal cross-sectional view of FIG.

1 to 5 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, an operation unit 5 projecting radially outward from the outer surface of the shaft tube 2, A sliding mechanism is provided that allows the pen point 31 of the writing body 3 to be projected and retracted from the front end hole 23 of the shaft cylinder 2 by sliding the operation unit 5 forward.

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 filled in the ink storage tube 32, and the thermochromic property. It consists of a follower (for example, a high-viscosity fluid) that fills the trailing edge of the ink and moves forward as the thermochromic ink 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 and a cylindrical rear shaft 22 connected to a rear end portion of the front shaft 21. A slide hole 24 extending in the front-rear direction is formed in the rear side wall of the shaft cylinder 2 (side wall of the rear shaft 22). A cam portion 26 is integrally formed on the inner surface of the shaft cylinder 2 (rear shaft 22).

A mounting hole 25 is provided in the rear end of the shaft cylinder 2 (rear end of the rear shaft 22) in the front-rear direction. The friction body 4 made of an elastic material is press-fitted or fitted over the mounting hole 25. Thereby, the friction body 4 is fixed to the rear end outer surface of the rear shaft 22. 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 protrusion 41 of the friction body 4 is formed in a convex curved shape.

The operation unit 5 also serves as a clip. The operation unit 5 includes a clip main body 51 extending in the front-rear direction, a base 52 integrally connected to the rear portion of the clip main body 51, and a shaft portion integrally connected to the base 52 and extending forward from the base 52. 53. The operation unit 5 is obtained from 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.

A plurality of rear end holes 27 penetrating in the front-rear direction are formed at equal intervals on the outer periphery in the vicinity of the friction body 4 at the rear end of the shaft cylinder 2 (rear shaft 22). In each of the rear end holes 27, the protective piece portion 6 is disposed so as to be movable in the front-rear direction. The front ends of the protective piece portions 6 are connected to each other by a connecting wall portion 61. The connecting wall portion 61 is disposed inside the shaft tube 2 in front of the rear end hole 27.

An elastic body 9 (compression coil spring) is disposed between the inner surface of the rear end wall of the shaft cylinder 2 and the rear surface of the connecting wall portion 61, whereby the connecting wall portion 61 is urged forward. (That is, the protective piece 6 is urged forward), and the connecting wall 61 is always in contact with the operating portion 5. As a result, the protective piece 6 can move in the front-rear direction integrally with the operation unit 5 without back-and-forth shaking. The resilience of the projectile 9 that biases the protective piece 6 forward is set smaller than the resilience of the projectile 8 that biases the writing body 3 backward.

At the time of pen tip immersion, the protection piece 6 protrudes rearward from the rear end hole 27, and the rear end of the protection piece 6 is positioned rearward from the top of the protrusion 41 of the friction body 4. On the other hand, when the pen tip protrudes, the protective piece portion 6 is greatly immersed forward (that is, into the shaft tube 2) from the rear end hole 27, and the top portion of the protruding portion 41 of the friction body 4 is the rear of the protective piece portion 6. Located behind the edge.

The in / out mechanism is a side slide type in / out mechanism using a rotating cam mechanism. The retracting mechanism includes a cam portion 26 formed on the inner surface of the rear shaft 22, a rotating member 7 that engages with the cam portion 26 and contacts the rear end of the writing body 3, engages with the rotating member 7, and The operation part 5 protrudes radially outward from the slide hole 24, and a resilient 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.

When the operation unit 5 (clip body) is slid forward from the pen tip immersion state against the rearward urging by the elastic body 8, the rotation member 7 is pressed forward by the operation unit 5, and the rotation member 7. Presses the rear end of the cursive body 39 forward, and the pen tip 31 protrudes from the front end hole 23 to the outside. At this time, the rotating member 7 is engaged with the cam portion 26, and the pen tip protruding state is maintained. At the same time, as the operating portion 5 moves forward, each protection piece 6 moves forward, and the top of the protrusion 41 of the friction body 4 is located behind the rear end of each protection piece 6. (Ie, the protrusion 41 of the friction body 4 protrudes rearward from the rear end of each protective piece 6). Thereby, it will be in a usable state (writing possible state and friction body usable state).

Next, when the operating portion 5 (clip body) is slid forward from the pen tip protruding state, the rotating member 7 is moved backward by the engagement of the cam portion 26 and the rotating cam. The operating body moves backward and enters the pen tip immersive state. As the operating portion 5 moves rearward, the respective protective piece portions 6 move rearward, and the rear ends of the respective protective piece portions 6 are positioned rearward from the protruding portions 41 of the friction body 4 (that is, each of the protective piece portions 6). The rear end of the protection piece 6 protrudes rearward from the top of the protrusion 41 of the friction body 4). Thereby, it will be in a non-use state (a writing non-use state and a friction body non-use state).

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-butadiene-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 22. 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 22 is integrally formed of an elastic material.

In the thermochromic writing instrument 1 of the present embodiment, when the pen nib is immersed, the protective piece 6 protrudes greatly rearward from the rear end hole 27, and the rear end of the protective piece 6 is the protruding portion 41 of the friction body 4. By positioning it behind the top, when not in use (when the pen tip is not used or when the friction body is not used), contact with the user's fingertips, or the friction body 4 and the inner surface of the container (for example, the inner surface of the pen case, the pen Contact with the bottom surface of the stand or the inner surface of the pocket of the clothes can be avoided, and adhesion of dirt or dust to the friction body 4 (that is, contamination of the friction body 4) can be prevented. In addition, the thermochromic writing instrument 1 of the present invention can simultaneously move the pen tip 31 and the friction body 4 by the operation of the operation unit 5, and is easy to operate and visually recognizes one of the protruding and protruding states. Only the infestation state on the opposite side can be identified. (For example, the pen tip appearance state can be identified by visually recognizing the protrusion state of the friction body 4. Alternatively, the protrusion state of the friction body 4 can be identified by visually confirming the protrusion state of the pen tip 31.)

The thermochromic writing instrument 1 of the present embodiment has a plurality of rear end holes 27 penetrating in the front-rear direction on the outer periphery in the vicinity of the friction body 4 at the rear end of the shaft cylinder 2. By providing a plurality of protection piece portions 6 in the loosely inserted state, the plurality of protection piece portions 6 can be disposed so as to surround the outer periphery of the protruding portion 41 of the friction body 4, and contamination of the friction body 4 can be further prevented. .

The thermochromic writing instrument 1 of the present embodiment is provided with a connecting wall portion 61 that connects the front ends of the respective protection piece portions 6 to each other, and the connecting wall portion 61 is located inside the shaft cylinder 2 in front of the rear end hole 27. It is possible to prevent each protective piece 6 from falling out of the rear end hole 27 by being housed in the rear end hole 27.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Front shaft 22 Rear shaft 23 Front end hole 24 Slide hole 25 Mounting hole 26 Cam part 27 Rear end hole 3 Writing body 31 Pen tip 32 Ink storage pipe 33 Tail plug 4 Friction body 41 Protrusion part 5 Operation part 51 Clip body 51a Ball part 52 Base part 53 Shaft part 6 Protective piece part 61 Connection wall part 7 Rotating member 8 Projectile body 9 Projectile body

Claims (2)

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 pen tip capable of discharging the thermochromic ink is provided at the front end of the cursive body The pendant of the writing body can be projected and retracted from the front end hole of the shaft tube by projecting an operation unit movable in the front-rear direction on the side wall of the shaft tube and sliding the operation unit forward. A thermochromic writing instrument in which a friction body made of a low-abrasion elastic material capable of thermally discoloring the handwriting of the thermochromic ink by rubbing the handwriting of the thermochromic ink at the rear end of the cylinder is projected. Because
A rear end hole is provided in the outer periphery of the rear end of the shaft cylinder in the vicinity of the friction body in the front-rear direction, a protective piece is provided in the rear end hole in a loosely inserted state, and the protective piece is integrated with the operation unit. Provided to be movable in the front-rear direction,
When the pen tip is immersed, the protective piece portion protrudes rearward from the rear end hole, the rear end of the protective piece portion is positioned rearward from the top of the protruding portion of the friction body, and when the pen tip protrudes, the protective piece portion is Largely sunk in front of the rear end hole, the top of the projecting portion of the friction body is located rearward of the rear end of the protective piece, and a plurality of front and rear ends of the rear end of the shaft cylinder are arranged in the vicinity of the friction body. A thermochromic writing instrument , wherein a plurality of protective pieces are provided in each rear end hole in a loosely inserted state . 2. The thermochromic writing instrument according to claim 1 , wherein a connecting wall portion that connects the front ends of each of the protective piece portions is provided, and the connecting wall portion is housed inside the shaft cylinder in front of the rear end hole .

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