JP2010260219A - Multi-core type thermochromic writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-core type thermochromic writing utensil which quickly performs heat discoloration of the handwriting of thermochromic ink by friction. <P>SOLUTION: A plurality of writing bodies 3 are housed in a barrel 2 so as to be movable forward and backward. From window holes 22 of the barrel 2, the operation part 41 of operating bodies 4 is protruded, the pen point 31 is alternatively made to move in and out from the front end hole 21 of the barrel 2. A thermochromic ink is stored inside the writing bodies 3. On the exterior of the operation part 41 of the operating bodies 4, there is provided a rubbing part 7 that is made of an elastic material and that can perform heat discoloration of the handwriting by frictional heat generated when the handwriting of the thermochromic ink is rubbed with the rubbing part 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a multi-core thermochromic writing instrument.

Document 1 contains thermochromic ink inside the writing core, a pen tip capable of discharging the thermochromic ink at the front end of the writing core, and the front end of the friction core, A tip capable of thermally discoloring the handwriting of the thermochromic ink by rubbing the handwriting of the thermochromic ink is provided, and the pen tip of the writing core and the tip of the friction core are alternatively provided as shafts. There is described a thermochromic writing instrument provided with a retracting mechanism that allows it to protrude from the front end hole of the cylinder.

Further, in Document 1, an elastic body that urges the writing core body backward and an elastic body that urges the friction core body backward are accommodated in a shaft tube, and the writing core An operating body is connected to the rear end of the body, an operating body is connected to the rear end of the friction core, and a plurality of window holes extending in the front-rear direction are provided in a radial direction in the side wall of the shaft cylinder, By projecting each of the operating bodies radially outward from the window hole and sliding one operating body forward along the window hole, the pen tip of the writing core corresponding to the one operating body Alternatively, the tip of the friction core is protruded to the outside from the front end hole of the shaft cylinder, and the pen tip of the writing core or the tip of the friction core that has been previously protruded is immersed in the shaft cylinder. A thermochromic writing instrument with a haunting mechanism is described.

JP 2008-247025 A

In the tip of the friction core of the conventional thermochromic writing instrument, when the handwriting by the thermochromic ink is large, it is difficult to quickly thermally discolor the handwriting by the thermochromic ink by friction.

The present invention is intended to solve the above-mentioned conventional problems and to provide a multi-core thermochromic writing instrument capable of rapidly thermal discoloring a large handwriting by thermochromic ink by friction. . In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side.

[1] In the first invention of the present application, a plurality of writing bodies 3 are accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, and thermochromic ink is accommodated in each of the writing bodies 3. A pen tip 31 capable of ejecting the thermochromic ink is provided at the front end of the writing body 3, and the operation bodies 4 are attached to the rear ends of the respective writing bodies 3, and each operation body 4 is moved backward by the elastic body 6. A plurality of window holes 22 extending in the axial direction are pierced radially in the side wall of the shaft cylinder 2, and the operation portions 41 of the respective operation bodies 4 are radially outward from the respective window holes 22. , And one operating portion 41 is slid forward along the window hole 22 so that the pen tip 31 of the writing body 3 to which the one operating body 4 is attached protrudes from the front end hole 21 of the shaft cylinder 2. In addition, the pen tip 31 of the other cursive body 3 that has been in the protruding state first is immersed in the shaft cylinder 2. The thermochromic writing instrument is made of an elastic material that can rub the handwriting of the thermochromic ink on the outer surface of the operation portion 41 of the operation body 4 and thermally change the handwriting with frictional heat generated at that time. It is a requirement that the friction part 7 is provided.

The multi-core thermochromic writing instrument 1 according to the first aspect of the present invention is capable of rubbing the handwriting of the thermochromic ink on the outer surface of the operation portion 41 of the operating body 4 and thermally discoloring the handwriting with frictional heat generated at that time. By providing the friction part 7, the friction part 7 can be formed large, and a large handwriting by the thermochromic ink can be rapidly discolored by friction of the friction part 7. The friction portion 7 of the operation portion 41 protrudes outside from the outer surface of the shaft tube 2 through the window hole 22 at least when the pen tip is immersed. Furthermore, the multi-core thermochromic writing instrument 1 of the first invention can prevent the friction part 7 and the finger from slipping by providing the friction part 7 made of an elastic material on the outer surface of the operation body 4. When the operation unit 41 is slid without causing pain to the finger, it is easy to apply a force to the operation unit 41, so that the operation unit 41 can be operated easily.

[2] According to a second invention of the present application, in the multi-core thermochromic writing instrument 1 of the first invention, the operation unit 4 and the friction unit 7 are configured by separate members, and the operation unit 41 of the operation body 4 It is a requirement that an attachment portion 41 a is formed on the outer surface, and the attachment portion 71 of the friction portion 7 is engaged with the attachment portion 41 a of the operation portion 41.

The multi-core thermochromic writing instrument 1 according to the second aspect of the invention can firmly attach the friction portion 7 and the operation portion 41 and can prevent the friction portion 7 from coming off from the operation portion 41 during friction.

[3] The third invention of the present application is that, in the multi-core thermochromic writing instrument 1 of the first invention, the operation part 41 and the friction part 7 are integrally formed of an elastic material. .

In the multi-core thermochromic writing instrument 1 of the third invention, the friction part 7 and the operation part 41 are integrally formed, so that the number of parts can be reduced and can be provided at a low cost. Does not come off the operation unit 41.

[4] According to a fourth invention of the present application, in the multi-core thermochromic writing instrument 1 of the first, second or third invention, the respective window holes 22 are arranged rearward at the rear end of the shaft tube 2. The opening 23 that can be freely opened and closed is provided, and the writing body 3 and the operation body 4 can be detached from the shaft cylinder 2 and inserted into the shaft cylinder 2 through the opening 23 in a connected state. As a requirement.

The multi-core thermochromic writing instrument 1 according to the fourth aspect of the present invention has the operation portion 41 of the operation body 4 greatly protruded from the opening 23 at the rear end of the shaft cylinder 2, and the operation body 4 is directly gripped. Friction by the friction part 7 can be performed, and the friction operation becomes extremely easy.

Friction part The elastic material constituting the friction part 7 of the present invention is preferably a synthetic resin (rubber or elastomer) having elasticity, such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS. Examples thereof include resins (styrene-ethylene-butadiene-styrene copolymers), fluorine resins, chloroprene resins, nitrile resins, polyester resins, ethylene propylene diene rubber (EPDM), and the like. The synthetic resin having elasticity constituting the friction body 4 is a low-abrasion elastic material in which wear debris (erasure debris) hardly occurs at the time of friction as compared with a high-abrasion elastic material (for example, an eraser). Preferably it consists of.

-Thermochromic ink In the present invention, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic pigment in which a reversible thermochromic composition containing at least the essential three components of a reaction medium for determining the occurrence temperature of the polymer is encapsulated in a microcapsule is preferably used.

In the present invention, as shown in FIG. 5, the shape of the curve plotting the change in the color density due to the temperature change is contrary to the case where the temperature is raised from the lower temperature side than the color change temperature range, from the higher temperature side than the color change temperature range. The color changes by following a different path depending on the descending state, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) or the color erase state in the high temperature range above the complete color erase temperature (t ₄ ) It is preferable to apply a color memory retention type thermochromic ink that can be stored and retained in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)]. In FIG. 5, ΔH indicates a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

In the present invention, the color change temperature due to frictional heat of the friction portion 7 of the thermochromic ink is set to 25 ° C. to 95 ° C. (preferably 36 ° C. to 95 ° C.). That is, in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), and the low temperature side discoloration point [ It is effective to set the complete color development temperature (t ₁ )] in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Accordingly, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and it is possible to easily change the handwriting by the reversible thermochromic ink with the frictional heat generated by the friction body 4.

The multi-core thermochromic writing instrument of the present invention can quickly discolor a large handwriting by a thermochromic ink by friction.

It is a longitudinal cross-sectional view of the closed state of the opening part of the 1st Embodiment of this invention. It is the side view of the opening state of the opening part of FIG. 1, and the longitudinal cross-sectional view of a cover part. It is a longitudinal cross-sectional view of the closed state of the opening part of the 2nd Embodiment of this invention. It is the side view of the opening state of the opening part of FIG. 3, and the longitudinal cross-sectional view of a cover part. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

<First Embodiment>
A first embodiment of the present invention is shown in FIGS.
In the multi-core thermochromic writing instrument 1 of the present embodiment, a plurality of (specifically, two) writing bodies 3 are accommodated in a shaft cylinder 2 so as to be movable in the front-rear direction. Each of the writing bodies 3 is urged rearward by an elastic body 6 (specifically, a compression coil spring).

(Shaft tube)
The shaft cylinder 2 includes a front shaft 2a formed of a tapered cylindrical body and a cylindrical rear shaft 2b attached to the rear end portion of the front shaft 2a by screwing or press-fitting. At the front end of the front shaft 2a, a front end hole 21 through which the pen tip 31 of the writing body 3 can protrude is provided in the axial direction. The front shaft 2a and the rear shaft 2b are obtained by injection molding of a synthetic resin (for example, polycarbonate).

A plurality of (specifically, two) elongated window holes 22 extending in the front-rear direction are provided in the radial direction in the rear side wall of the rear shaft 2b. The two window holes 22 are formed at symmetrical positions with respect to the axis. In addition, an opening 23 that penetrates in the axial direction and opens outward in the radial direction is formed at the rear end of the rear shaft 2b. The opening 23 communicates with the window hole 22 at the rear end of the rear shaft 2b (that is, the rear end of the shaft cylinder 2), whereby the rear end of the window hole 22 is notched rearward and opened rearward. The writing body 3 with the operating body 4 attached thereto can be inserted into the shaft tube 2 and taken out from the shaft tube 2 through the opening 23.

Further, a locking wall portion (not shown) made of a rib extending in the front-rear direction is formed on the inner surface of the side wall between the window holes 22 of the rear shaft 2b, and a pen tip 31 is formed on the locking wall portion. The rear end of the operation body 4 of the writing body 3 when protruding is locked. Further, a clip 25 is provided on the outer surface of the side wall between the window holes 22 of the rear shaft 2b.

(Cover)
At the rear end portion of the rear shaft 2b, a lid portion 5 that freely opens and closes the opening portion 23 is rotatably provided. One end of the lid 5 is pivotally connected to the base of the clip 25 by a hinge 51. The lid 5 is rotatable in a substantially front-rear direction. A contact wall 52 is formed on the front surface of the lid 5. The rear end of each operating body 4 connected to the rear end of the writing body 3 in the pen tip immersion state is in contact with the contact wall 52. In the present invention, the abutting wall portion 52 may be formed integrally with the shaft cylinder 2 (rear shaft 2b) in addition to the configuration formed on the front surface of the lid portion 5.

On the front surface of the other end portion of the lid portion 5, an engaging portion 53 including a concave portion or a hole portion is provided. At the rear end of the rear shaft 2b, an engaged portion 24 including a protrusion that can engage with the engaging portion 53 is provided. An inward projection is formed on the inner surface of the engaging portion 53, while an outward projection that can get over and engage with the inward projection is formed on the outer surface of the engaged portion 24.

(Cursive)
Each of the writing bodies 3 is a ball-point pen refill, and includes a ball-point pen tip (that is, a pen tip 31) in which a ball is rotatably held at the front end, and an ink container that includes the ball-point pen tip at the front end and has an open rear end. A tube 32; The ink storage tube 32 is filled with a thermochromic ink made of an aqueous gel and a follower made of a high-viscosity fluid that is disposed at the rear end of the ink and moves forward as the ink is consumed.

The ballpoint pen tip employs a configuration in which a ball held rotatably at the front end is urged forward by a projectile or the like, and the ball is brought into close contact with the inner surface of the front end edge. In addition, the ballpoint pen tip may be directly attached to the front end opening of the ink containing tube 32 by press fitting or the like, but in this embodiment, it is fixed to the front end opening of the ink containing tube 32 via the pen tip holder.

(Operation body)
The operation body 4 is attached to the rear end of each of the writing bodies 3 (that is, the rear end opening of the ink containing tube 32). Each of the operation bodies 4 includes an operation portion 41 formed at the rear end portion and projecting outside from the window hole 22 of the shaft cylinder 2, a rear side projection portion 43 provided on the opposite side of the operation portion 41, A front projecting portion 42 provided in front of the rear projecting portion 43 on the opposite side of the operation portion 41; a fitting portion 44 formed at the front end portion and fitted into the rear end opening of the ink containing tube 32; and the fitting portion 44 and a flange 45 formed behind 44. In addition, the rear end of the projectile 6 is locked to the front surface of the flange portion 45. Further, a retaining projection 46 is formed on both side surfaces of the operating body 4. The retaining projection 46 can be engaged with the inner surfaces of both side walls of the window hole 22.

Each operation body 4 is formed of a molded body of a synthetic resin (for example, polyacetal resin, ABS resin, etc.). Each of the operation bodies 4 is colored in substantially the same color as the color of the ink stored in the connected writing body 3 (that is, in the ink storage tube 32). Specifically, each of the operation bodies 4 is formed of a synthetic resin molded body colored in substantially the same color as the ink color of the connected writing body 3.

(Friction part)
A mounting portion 41 a (specifically, a mounting convex portion) is integrally formed on the outer surface of the operating portion 41 of the operating body 4. The mounting portion 41a is press-fitted and fixed to a mounted portion 71 (specifically, a mounting concave portion) of the friction portion 7. Thereby, the friction part 7 is fixed to the outer surface of the operation part 41. The friction part 7 is made of an elastic material. The friction part 7 includes a convex curved surface whose outer diameter decreases as it goes radially outward. The friction part 7 may be detachable from the outer surface of the operation part 41 so that the friction part 7 can be exchanged. Further, the operating body 4 provided with the friction part 7 can be replaced through the opening 23. Further, by making the operation body 4 and the ink containing tube 32 detachable, only the operation body 4 can be replaced. In the present invention, the mounting portion 41a may be a mounting concave portion and the mounted portion 71 may be a mounting convex portion.

When the pen point 31 of the writing body 3 is in an immersive state, the rear end portion of the operating body 4 attached to the writing body 3 is brought into contact with a contact wall portion 52 formed on the front surface of the lid portion 5. On the other hand, when the pen tip 31 of the writing body 3 is in a protruding state, the rear end portion of the operation body 4 attached to the writing body 3 is locked to a locking wall portion formed on the inner wall of the shaft tube 2. .

The front protruding portion 42 of the operating body 4 connected to the rear end of the writing body 3 in the pen tip immersing state is in a pen tip protruding state when the operating portion 41 of the operating body 4 is slid forward. The pendant protruding state of the other cursive body 3 is released by contacting the rear projecting portion 43 of the operating body 4 connected to the rear end of the other cursive body 3.

The multi-core thermochromic writing instrument 1 of the present embodiment is provided with a friction portion 7 on the outer surface of the operation portion 41 that can rub the handwriting of the thermochromic ink and thermally change the handwriting with frictional heat generated at that time. As a result, the friction portion 7 can be formed large, and a large handwriting by the thermochromic ink can be rapidly discolored by friction of the friction portion 7. Furthermore, the multi-core thermochromic writing instrument 1 according to the present embodiment is provided with the friction part 7 made of an elastic material on the outer surface of the operation body 4, so that the friction part 7 and the finger can be prevented from slipping. When the operation unit 41 is slid without any pain, the operation unit 41 can be easily operated because a force is easily applied to the operation unit 41.

In the multi-core thermochromic writing instrument 1 of the present embodiment, an attachment portion 41 a is formed on the operation portion 41 of the operation body 4, and the attachment portion 71 of the friction portion 7 is engaged with the attachment portion 41 a of the operation portion 41. By doing so, the friction part 7 and the operation part 41 can be firmly attached, and the friction part 7 can be prevented from being detached from the operation part 41 during friction.

The multi-core thermochromic writing instrument 1 of the present embodiment is provided with an openable / closable opening 23 at the rear end of the shaft tube 2 for opening each of the window holes 22 rearwardly, and through the opening 23. By constructing the writing body 3 and the operating body 4 in a connected state so that they can be removed from the shaft cylinder 2 and inserted into the shaft cylinder 2, the operating portion 41 of the operating body 4 can be connected to the opening 23 at the rear end of the shaft cylinder 2. The operating body 4 can be directly gripped and friction can be performed by the friction portion 7 of the operating portion 41, which makes the friction operation extremely easy.

<Second Embodiment>
A second embodiment of the present invention is shown in FIGS.
In the multi-core thermochromic writing instrument 1 of the present embodiment, a plurality of (specifically, two) writing bodies 3 are accommodated in a shaft cylinder 2 so as to be movable in the front-rear direction. Each of the writing bodies 3 is urged rearward by an elastic body 6 (specifically, a compression coil spring).

(Shaft tube)
The shaft cylinder 2 includes a front shaft 2a formed of a tapered cylindrical body and a cylindrical rear shaft 2b attached to the rear end portion of the front shaft 2a by screwing or press-fitting. At the front end of the front shaft 2a, a front end hole 21 through which the pen tip 31 of the writing body 3 can protrude is provided in the axial direction. The front shaft 2a and the rear shaft 2b are obtained by injection molding of a synthetic resin (for example, polycarbonate).

A plurality of (specifically, two) elongated window holes 22 extending in the front-rear direction are provided in the radial direction in the rear side wall of the rear shaft 2b. The two window holes 22 are formed at symmetrical positions with respect to the axis. In addition, an opening 23 that penetrates in the axial direction and opens outward in the radial direction is formed at the rear end of the rear shaft 2b. The opening 23 communicates with the window hole 22 at the rear end of the rear shaft 2b (that is, the rear end of the shaft cylinder 2), whereby the rear end of the window hole 22 is notched rearward and opened rearward. The writing body 3 with the operating body 4 attached thereto can be inserted into the shaft tube 2 and taken out from the shaft tube 2 through the opening 23.

Further, a locking wall portion (not shown) made of a rib extending in the front-rear direction is formed on the inner surface of the side wall between the window holes 22 of the rear shaft 2b, and a pen tip 31 is formed on the locking wall portion. The rear end of the operation body 4 of the writing body 3 when protruding is locked. Further, a clip 25 is provided on the outer surface of the side wall between the window holes 22 of the rear shaft 2b.

(Cover)
At the rear end portion of the rear shaft 2b, a lid portion 5 that freely opens and closes the opening portion 23 is rotatably provided. One end of the lid 5 is pivotally connected to the base of the clip 25 by a hinge 51. The lid 5 is rotatable in a substantially front-rear direction. A contact wall 52 is formed on the front surface of the lid 5. The rear end of each operating body 4 connected to the rear end of the writing body 3 in the pen tip immersion state is in contact with the contact wall 52. In the present invention, the abutting wall portion 52 may be formed integrally with the shaft cylinder 2 (rear shaft 2b) in addition to the configuration formed on the front surface of the lid portion 5.

On the front surface of the other end portion of the lid portion 5, an engaging portion 53 including a concave portion or a hole portion is provided. At the rear end of the rear shaft 2b, an engaged portion 24 including a protrusion that can engage with the engaging portion 53 is provided. An inward projection is formed on the inner surface of the engaging portion 53, while an outward projection that can get over and engage with the inward projection is formed on the outer surface of the engaged portion 24.

(Cursive)
Each of the writing bodies 3 is a ball-point pen refill, and includes a ball-point pen tip (that is, a pen tip 31) in which a ball is rotatably held at the front end, and an ink container that includes the ball-point pen tip at the front end and has an open rear end. A tube 32; The ink storage tube 32 is filled with a thermochromic ink made of an aqueous gel and a follower made of a high-viscosity fluid that is disposed at the rear end of the ink and moves forward as the ink is consumed.

The ballpoint pen tip employs a configuration in which a ball held rotatably at the front end is urged forward by a projectile or the like, and the ball is brought into close contact with the inner surface of the front end edge. In addition, the ballpoint pen tip may be directly attached to the front end opening of the ink containing tube 32 by press fitting or the like, but in this embodiment, it is fixed to the front end opening of the ink containing tube 32 via the pen tip holder.

(Operation body)
The operation body 4 is attached to the rear end of each of the writing bodies 3 (that is, the rear end opening of the ink containing tube 32). Each of the operation bodies 4 includes an operation portion 41 formed at the rear end portion and projecting outside from the window hole 22 of the shaft cylinder 2, a rear side projection portion 43 provided on the opposite side of the operation portion 41, A front projecting portion 42 provided in front of the rear projecting portion 43 on the opposite side of the operation portion 41; a fitting portion 44 formed at the front end portion and fitted into the rear end opening of the ink containing tube 32; and the fitting portion 44 and a flange 45 formed behind 44. In addition, the rear end of the projectile 6 is locked to the front surface of the flange portion 45. Further, a retaining projection 46 is formed on both side surfaces of the operating body 4. The retaining projection 46 can be engaged with the inner surfaces of both side walls of the window hole 22.

Each of the operating bodies 4 is formed by integrally forming the operating portion 41, the front protruding portion 42, the rear protruding portion 43, the fitting portion 44, the flange portion 45, and the retaining projection 46 with an elastic material. Each of the operation bodies 4 is colored in substantially the same color as the color of the ink stored in the connected writing body 3 (that is, in the ink storage tube 32). Specifically, each of the operation bodies 4 is formed of a synthetic resin molded body having elasticity colored in substantially the same color as the ink color of the writing body 3 to be connected.

(Friction part)
The friction part 7 is integrally formed on the outer surface of the operation part 41. That is, the operation part 41 and the friction part 7 are made of the same elastic material. The friction part 7 includes a convex curved surface whose outer diameter decreases as it goes radially outward. The operating body 4 provided with the friction part 7 can be replaced through the opening 23. Further, by making the operation body 4 and the ink containing tube 32 detachable, only the operation body 4 can be replaced.

When the pen point 31 of the writing body 3 is in an immersive state, the rear end portion of the operating body 4 attached to the writing body 3 is brought into contact with a contact wall portion 52 formed on the front surface of the lid portion 5. On the other hand, when the pen tip 31 of the writing body 3 is in a protruding state, the rear end portion of the operation body 4 attached to the writing body 3 is locked to a locking wall portion formed on the inner wall of the shaft tube 2. .

The front protruding portion 42 of the operating body 4 connected to the rear end of the writing body 3 in the pen tip immersing state is in a pen tip protruding state when the operating portion 41 of the operating body 4 is slid forward. The pendant protruding state of the other cursive body 3 is released by contacting the rear projecting portion 43 of the operating body 4 connected to the rear end of the other cursive body 3.

The multi-core thermochromic writing instrument 1 of the present embodiment is provided with a friction portion 7 on the outer surface of the operation portion 41 that can rub the handwriting of the thermochromic ink and thermally change the handwriting with frictional heat generated at that time. As a result, the friction portion 7 can be formed large, and a large handwriting by the thermochromic ink can be rapidly discolored by friction of the friction portion 7. Furthermore, the multi-core thermochromic writing instrument 1 according to the present embodiment is provided with the friction part 7 made of an elastic material on the outer surface of the operation body 4, so that the friction part 7 and the finger can be prevented from slipping. When the operation unit 41 is slid without any pain, the operation unit 41 can be easily operated because a force is easily applied to the operation unit 41.

In the multi-core thermochromic writing instrument 1 of the present embodiment, the friction part 7 and the operation part 41 are integrally formed, so that the number of parts can be reduced and can be provided at a low cost. Does not come off the operation unit 41.

The multi-core thermochromic writing instrument 1 of the present embodiment is provided with an openable / closable opening 23 at the rear end of the shaft tube 2 for opening each of the window holes 22 rearwardly, and through the opening 23. By constructing the writing body 3 and the operating body 4 in a connected state so that they can be removed from the shaft cylinder 2 and inserted into the shaft cylinder 2, the operating portion 41 of the operating body 4 can be connected to the opening 23 at the rear end of the shaft cylinder 2. The operating body 4 can be directly gripped and friction can be performed by the friction portion 7 of the operating portion 41, which makes the friction operation extremely easy.

DESCRIPTION OF SYMBOLS 1 Multi-core type thermochromic writing instrument 2 Shaft cylinder 2a Front shaft 2b Rear shaft 21 Front end hole 22 Window hole 23 Opening part 24 Engagement part 25 Clip 3 Writing body 31 Pen tip 32 Ink storage pipe 4 Operation body 41 Operation part 41a Attachment part 42 Front protrusion part 43 Rear protrusion part 44 Insertion part 45 Eaves part 46 Retaining protrusion 5 Lid part 51 Hinge part 52 Abutting wall part 53 Engagement part 6 Bullet 7 Friction part 71 Attached part

Claims (4)

A pen in which a plurality of writing bodies are accommodated in a shaft cylinder so as to be movable in the front-rear direction, a thermochromic ink is accommodated in each of the writing bodies, and the thermochromic ink can be discharged to the front end of each writing body And a plurality of window holes extending in the axial direction on the side wall of the shaft cylinder. One operation is performed by projecting the operation part of each operation body radially outward from each window hole and sliding one operation part forward along the window hole. A multi-core thermochromic writing instrument that causes the pen tip of the cursive body attached to the body to protrude from the front end hole of the shaft cylinder, and the pen tip of the other cursive body that had previously protruded into the shaft cylinder. The hand of the thermochromic ink is rubbed against the outer surface of the operation portion of the operation body. Multicore type thermochromic writing instrument the 該筆 traces in frictional heat can be thermochromic, characterized in that a friction portion made of an elastic material that occurs. The operation portion and the friction portion are configured by separate members, an attachment portion is formed on the outer surface of the operation portion of the operation body, and the attachment portion of the friction portion is engaged with the attachment portion of the operation portion. Core-type thermochromic writing instrument. The multi-core thermochromic writing instrument according to claim 1, wherein the operation portion and the friction portion are integrally formed of an elastic material. An openable and closable opening that opens each of the window holes rearward is provided at the rear end of the shaft tube, and the writing body and the operating body can be removed from the shaft tube in a connected state through the opening, and the shaft tube The multi-core thermochromic writing instrument according to any one of claims 1 to 3, wherein the multi-core thermochromic writing instrument is configured to be insertable therein.

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