JP2012218389A - Thermochromic writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermochromic writing utensil which achieves reduction in the number of parts and an increase in the flexibility in terms of appearance design.SOLUTION: The thermochromic writing utensil is configured such that thermochromic ink is stored inside a writing element 8, and a pen point 81 of the writing element 8 can project/retract from a front end hole 31 of a shaft cylinder. The writing utensil includes a projecting/retracting mechanism that locks a ball part 52 of a clip body 5 with a locking part 22 on a side wall of the shaft cylinder 2 by performing forward sliding operation of the clip body 5 against backward energizing of a resilient body 6, whereby it sets a pen point projecting state from a pen point retracted state, and releases locking of the ball part 52 of the clip body 5 with the locking part 22 on the side wall of the shaft cylinder 2, whereby it sets the pen point retracted state from the pen point projecting state. The writing utensil is provided with a friction part 9 that rubs handwriting in the thermochromic ink and thermally discolors the handwriting with frictional heat generated at that time at the rear end of the clip body 5.

Description

The present invention relates to a thermochromic writing instrument. Specifically, thermochromic ink is accommodated in the cursive body, a pen tip capable of discharging the thermochromic ink is provided at the front end of the cursive body, and the cursive body can be moved in the front-rear direction in the shaft cylinder. And a thermochromic writing instrument in which the pen tip of the writing body is configured to be able to protrude and retract from a front end hole of a shaft cylinder.

In Patent Document 1, a writing body is accommodated in a shaft cylinder so as to be movable in the front-rear direction, an operation portion is provided on an outer surface of the shaft tube, and the pen tip of the writing body is attached to the shaft tube by operating the operation portion. It is configured to be able to appear and retract from a front end hole, accommodates thermochromic ink inside the cursive body, provides a pen tip capable of ejecting the thermochromic ink at the front end of the cursive body, on the outer surface of the shaft cylinder, There has been disclosed a thermochromic writing instrument provided with a friction portion capable of thermally changing the handwriting with frictional heat generated by rubbing the handwriting of the thermochromic ink.

In Patent Document 1, when both a pen tip protruding operation and a pen tip retracting operation employ a type of retracting mechanism (so-called double knock type) in which the operation unit is pressed forward, the number of parts increases and the cost is reduced. May not be available.

Further, in FIG. 15 of Patent Document 1, the operation portion is protruded radially outward from the side wall of the shaft cylinder, and the operation portion is pushed forward against the rear bias, thereby removing the pen tip from the immersive state. There is disclosed a configuration in which a pen tip protruding state (so-called multi-core type side slide type) projecting and retracting mechanism is provided, and a friction portion is provided on the outer surface of the rear end of the shaft cylinder. However, the thermochromic writing instrument with this configuration must operate an operating tool attached to another writing tool when the pen tip protrudes from the pen tip protruding state (when the pen tip protruding state is canceled). . Therefore, it is necessary to provide a plurality of operating bodies (that is, a plurality of protruding portions), and the degree of freedom in appearance design is reduced. Furthermore, when a clip that can be held in a pocket or the like is provided on the shaft tube, the protruding portion is further increased, and the degree of freedom in appearance design is reduced.

International Publication No. 2008/105227 Pamphlet

The present invention solves the above-mentioned conventional problems, and aims to provide a thermochromic writing instrument that can reduce the number of parts and increase the degree of freedom in appearance design. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side. In the present invention, the “pen nib immersive state” refers to a state in which the pen nib is immersed in the shaft cylinder, and the “pen nib protruding state” refers to a state in which the pen nib projects outward from the front end of the shaft cylinder. Say.

<1> In the first invention of the present application, a thermochromic ink is accommodated in the cursive body 8, and a pen tip 81 capable of discharging the thermochromic ink is provided at a front end of the cursive body 8. 8 is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, the writing body 8 is urged rearward by a resilient body 6 provided in the shaft cylinder 2, and the pen tip 81 of the writing body 8 is moved to the shaft cylinder. 2 is a thermochromic writing tool configured to be able to protrude and retract from the front end hole 31 of the second end, provided with a clip body 5 movably in the front-rear direction on the side wall of the shaft cylinder 2, and a rear end of the writing body 8 on the clip body 5 Are brought into contact with each other in the front-rear direction, and a ball portion 52 is projected from a radially inner surface of the front portion of the clip body 5, so that the clip body 5 is moved forward from the pen tip immersion state against the rearward bias of the bullet body 6. The ball portion 52 of the clip body 5 is locked to the locking portion 22 on the side wall of the shaft cylinder 2 by sliding the handle The pen tip protrudes into the pen tip protruding state, and the pen tip retracts from the pen tip protruding state by releasing the locking between the ball portion 52 of the clip body 5 and the locking portion 22 of the side wall of the shaft cylinder 2. Provided with a friction part 9 at the rear end of the clip body 5 capable of rubbing the handwriting of the thermochromic ink and heat-discoloring the handwriting by frictional heat generated at that time, at least in the pen tip immersion state It is a requirement that the friction portion 9 protrudes rearward from the rear end of the shaft tube 2.

The thermochromic writing instrument 1 according to the first aspect of the present invention can reduce the number of parts compared to a conventional double-knock type protruding and retracting mechanism. In addition, the thermochromic writing instrument 1 of the first invention has a protruding portion as compared with a conventional multi-core type side slide thermochromic writing instrument, although a clip is provided on the side wall of the shaft tube 2. The degree of freedom in appearance design is increased, and a smart appearance can be obtained.

In the present invention, the ball portion 52 of the clip body 5 can be held in a pocket or the like between the side wall 2 and the side wall of the shaft cylinder 2.

<2> The second invention of the present application is that, in the thermochromic writing instrument 1 of the first invention, in the pen tip protruding state and the pen tip immersing state, the friction portion 9 is rearward from the rear end of the shaft tube 2. It is a requirement that it protrudes.

In the thermochromic writing instrument 1 of the second invention, in the pen tip protruding state and the pen tip immersing state (that is, always), the friction portion 9 is protruded rearward from the rear end of the shaft tube 2 so that the friction is achieved. When the body is used, it is not necessary to check the protruding state of the friction body, and the friction work can be started quickly.

<3> The third invention of the present application is the thermochromic writing instrument 1 according to the first invention or the second invention, wherein the clip body 5 is a clip in which a ball portion 52 projects from the radially inner surface on the front side. A main body 51, a base portion 54 provided continuously to the radially inner surface of the clip main body 51 behind the ball portion 52, and an operation portion 53 formed at the rear end portion of the clip main body 51 protruding rearward from the base portion 54. And a synthetic resin integral molded body comprising a U-shaped bent portion 55 having one end connected to the base portion 54 and a mounting portion 56 to which the friction portion 9 can be attached to the other end of the bent portion 55. The rear end of the writing body 8 is brought into contact with the front surface of the bent portion 55 in the front-rear direction, the non-contact state between the base portion 54 and the attachment portion 56 is maintained, and the operation portion 53 is moved inward in the radial direction. By pressing, the engagement between the ball portion 52 of the clip body 5 and the side wall of the barrel 2 It is a requirement that the engagement between the parts 22 is released.

In the thermochromic writing instrument 1 according to the third aspect of the present invention, the clip body 5 is formed from a synthetic resin integral molded body including a clip body 51, a base portion 54, an operation portion 53, a bent portion 55, and an attachment portion 56. Therefore, the number of parts can be reduced as compared with the conventional double knock type intrusion mechanism. When the thermochromic writing instrument 1 according to the third aspect of the present invention presses the operation portion 53 of the clip body 5 radially inward by maintaining the non-contact state between the base portion 54 and the attachment portion 56. In addition, the attachment state of the friction portion 9 at the attachment portion 56 is not affected, and the friction portion 9 is not likely to drop off from the attachment portion 56.

The thermochromic writing instrument of the present invention can reduce the number of parts, and the degree of freedom in appearance design increases.

It is a longitudinal cross-sectional view which shows the pen tip immersion state of embodiment of this invention. It is a longitudinal cross-sectional view which shows the pen tip protrusion state of FIG. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

1 and 2 show an embodiment of the present invention.
The thermochromic writing instrument 1 of the present embodiment is accommodated in the shaft tube 2, a single clip body 5 provided on the outer surface of the side wall of the shaft tube 2 so as to be movable in the front-rear direction, and the shaft tube 2. The writing body 8, the elastic body 6 accommodated in the shaft cylinder 2 and biasing the writing body 8 rearward, and the pen tip 81 of the writing body 8 can be projected and retracted from the front end hole 31 of the shaft cylinder 2. And a haunting mechanism.

Cursive body The cursive body 8 includes a pen tip 81, an ink containing tube 82 in which the pen tip 81 is press-fitted and fixed to the front end opening, a thermochromic ink filled in the ink containing tube 82, It consists of a follower (for example, a high-viscosity fluid) that fills the rear end of the thermochromic ink and moves forward as the thermochromic ink is consumed.

The nib 81 is composed of, for example, a metal ballpoint pen tip having a ball rotatably held at the front end, or a pen tip holder made of a synthetic resin holding the ballpoint tip and the rear outer surface of the ballpoint tip. Any of the configurations may be possible. Further, a tail plug 83 having a vent hole through which the ink containing tube 82 and the outside can vent is attached to the rear end opening of the ink containing tube 82.

Shaft cylinder The shaft cylinder 2 includes a tapered cylindrical front shaft 3 and a cylindrical rear shaft 4 connected to a rear end portion of the front shaft 3.

The front shaft 3 includes a tapered cylindrical main body 32 made of a synthetic resin molding and a grip 33 made of an elastic material provided on the outer surface of the main body 32. The grip portion 33 is provided by two-color molding or mounting. The rear end portion of the front shaft 3 is reduced in diameter, and a male screw portion is formed on the outer surface thereof. A front end hole 31 is provided in the front end of the front shaft 3 in the front-rear direction.

The rear shaft 4 is formed of a cylindrical synthetic resin molded body. A female thread portion is formed on the inner surface of the front end portion of the rear shaft 4. The male screw portion of the front shaft 3 can be screwed into the female screw portion. A slide hole 21 extending in the front-rear direction and a long hole 23 extending in the front-rear direction are formed in the side wall of the rear shaft 4. The long hole 23 is formed on a side opposite to the radial direction of the slide hole 21 (a symmetric position with respect to the axis). The slide hole 21 is closed at the front end and opened rearward. The long hole 23 is closed at the front end and the rear end. A locking portion 22 made of a hole is formed on the side wall of the rear shaft 4 slightly in front of the slide hole 21. The locking portion 22 may be a concave portion or a convex portion in addition to the hole.

The clip body 5 is integrally connected to a clip main body 51 extending in the front-rear direction, a ball portion 52 protruding from a radially inner surface of a front portion of the clip main body 51, and a rear portion of the clip main body 51. A base portion 54, an operation portion 53 protruding rearward from the base portion 54 and integrally provided at the rear end of the clip body 51, a U-shaped bent portion 55 integrally provided at the base portion 54, The cylindrical mounting portion 56 is integrally connected to the rear end portion of the bent portion 55, and the L-shaped guide portion 57 is integrally connected to the radially outer side of the bent portion 55. The clip body 5 is obtained by a synthetic resin molded body.

A clip elastic body 7 (for example, a compression coil spring) is accommodated on the inner surface of the bent portion 55, and a radial elastic force is applied to the bent portion 55. In addition to this, even if the clip bullet body 7 is not provided and only the bent portion 55 is configured, a radial elastic force can be applied to the bent portion 55.

The guide portion 57 can be elastically deformed (flexible deformation) in the radial direction. The clip body 5 is inserted into the shaft tube 2 from the rear end of the shaft tube 2. When the clip body 5 is inserted into the shaft tube 2 from the rear end of the shaft tube 2, the guide portion 57 gets over the long hole 23 and the guide portion 57 slides in the long hole 23 in the front-rear direction. It becomes possible to move. By engaging the guide portion 57 with the long hole 23, it is possible to prevent the clip body 5 from dropping from the shaft tube 2 when the pen tip is immersed. At the same time, the base portion 54 is inserted into the slide hole 21, and the base portion 54 can slide in the slide hole 21 in the front-rear direction. The base portion 54 and the attachment portion 56 are maintained in a non-contact state.

A friction part made of an elastic material is attached in the attachment part 56 by fitting. The friction portion 9 can move in the front-rear direction as the clip body moves in the front-rear direction. However, in the pen-tip protruding state and the pen-tip immersion state (that is, always), the friction portion 9 is attached to the shaft cylinder 2. It protrudes backward from the rear end.

The elastic material constituting the friction portion 9 is preferably a synthetic resin (rubber or elastomer) having elasticity. For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butylene) -Styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like. The synthetic resin having elasticity constituting the friction part 9 is a low-abrasion elastic material in which almost no wear debris (erasing debris) is generated during friction, compared to a high-abrasion elastic material (for example, an eraser). Preferably it consists of.

-In / out mechanism The in / out mechanism moves the clip body 5 back and forth to make the pen tip appear and disappear.

When the clip body 5 is slid forward from the pen tip retracted state against the rear bias by the elastic body 6, the ball portion 52 of the clip body 5 engages with the side wall of the shaft cylinder 2. It is latched by the part 22 and the pen tip protruding state is maintained.

When the operation portion 53 of the clip body 5 is pressed radially inward from the pen tip protruding state, the front end portion of the clip body 5 is displaced radially outward with the base 54 as a fulcrum, and the ball portion 52 and the locking portion 22 is released. At the same time, the writing body 8 is moved rearward by the rearward urging of the projectile body 6, the guide portion 57 is brought into contact with the rear end of the long hole 23, and the pen tip immersion state is maintained.

-Thermochromic ink In the present embodiment, 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 embodiment, as shown in FIG. 3, the shape of the curve plotting the change in the color density due to the temperature change is higher than the color change temperature range, contrary to the case where the temperature is raised from the lower temperature side than the color change temperature range. The color changes by following a different route from the case of descending from the side, and the color develops in a low temperature region below the complete color development temperature (t ₁ ), or the color erases in a high temperature region above the complete color erase temperature (t ₄ ). It is preferable to apply a color memory holding type thermochromic ink whose state can be stored and held in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase holding temperature range)]. In FIG. 3, 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 embodiment, the color change temperature due to frictional heat of the frictional part 9 of the thermochromic ink is set to 25 ° C. to 95 ° C. (preferably 36 ° C. to 95 ° C.). That is, in this embodiment, the high temperature side discoloration point [complete decoloration 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 is performed. It is effective to set the point [complete color development temperature (t ₁ )] within a 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 portion 9.

The thermochromic writing instrument 1 according to the present embodiment can reduce the number of parts as compared with a conventional double knock type protruding and retracting mechanism. Further, the thermochromic writing instrument 1 of the present embodiment has fewer protruding portions than the conventional multi-core type side-sliding thermochromic writing instrument, although a clip is provided on the side wall of the shaft tube 2. The degree of freedom in appearance design is increased, and a smart appearance can be obtained.

The thermochromic writing instrument 1 according to the present embodiment has a friction body by projecting the friction portion 9 rearward from the rear end of the shaft cylinder 2 in the pen tip protruding state and the pen tip immersing state (that is, always). When using, it becomes unnecessary to confirm the protruding state of the friction body, and the friction work can be started quickly.

In the thermochromic writing instrument 1 of the present embodiment, the clip body 5 is formed of a synthetic resin integral molded body including a clip body 51, a base portion 54, an operation portion 53, a bent portion 55, and an attachment portion 56. Therefore, the number of parts can be reduced as compared with the conventional double knock type intrusion mechanism. When the thermochromic writing instrument 1 of the present embodiment is operated to press the operation portion 53 of the clip body 5 radially inward by maintaining the non-contact state between the base portion 54 and the attachment portion 56, The attachment state of the friction portion 9 at the attachment portion 56 is not affected, and there is no possibility that the friction portion 9 falls off the attachment portion 56.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Slide hole 22 Locking part 23 Long hole 3 Front shaft 31 Front end hole 32 Main body 33 Holding part 4 Rear shaft 5 Clip body 51 Clip main body 52 Ball part 53 Operation part 54 Base part 55 Bending part 56 Mounting portion 57 Guide portion 6 Bullet 7 Clip bullet 8 Writing body 81 Pen tip 82 Ink storage tube 83 Tail plug 9 Friction portion

Claims (3)

A thermochromic ink is accommodated inside the cursive body, a pen tip capable of ejecting the thermochromic ink is provided at the front end of the cursive body, and the cursive body is accommodated in the shaft cylinder so as to be movable in the front-rear direction. A thermochromic writing instrument configured such that the writing body is urged rearward by a projectile provided in a shaft cylinder, and the pen tip of the writing body is configured to be able to protrude and retract from a front end hole of the shaft cylinder,
A clip body is provided on the side wall of the shaft cylinder so as to be movable in the front-rear direction, a rear end of the writing body is brought into contact with the clip body in the front-rear direction, and a ball portion is protruded on a radially inner surface of the front portion of the clip body. The ball portion of the clip body is locked to the locking portion of the shaft cylinder side wall by sliding the clip body forward against the rearward bias of the projectile body from the pen tip immersion state. A pen tip protruding state by the pen tip protruding state, and the clip is provided with a retracting mechanism for releasing the lock between the ball portion of the clip body and the locking portion of the shaft cylinder side wall from the pen tip protruding state, At the rear end of the body, there is provided a friction part capable of rubbing the handwriting of the thermochromic ink and heat-discoloring the handwriting by the frictional heat generated at that time, and at least in the pen tip immersion state, the friction part is disposed behind the shaft cylinder. Projecting backward from the edge Thermochromic writing instrument and butterflies. 2. The thermochromic writing instrument according to claim 1, wherein the friction portion protrudes rearward from a rear end of the shaft tube in a pen tip protruding state and a pen tip immersing state. The clip body protrudes rearward from the clip main body in which a ball portion projects on the radially inner surface on the front side, a base portion connected to the radial inner surface of the clip main body behind the ball portion, and the base portion. A composite comprising an operating portion formed at the rear end of the clip body, a U-shaped bent portion having one end connected to the base portion, and a mounting portion to which a friction portion can be attached to the other end of the bent portion It consists of an integrally molded body of resin, and the rear end of the writing body is brought into contact with the front surface of the bent portion in the front-rear direction, so that the non-contact state between the base portion and the mounting portion is maintained, and the operation portion is placed in the radial direction. The thermochromic writing instrument according to claim 1 or 2, wherein the locking between the ball part of the clip body and the locking part of the shaft cylinder side wall is released by pressing in the direction.

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