JP2012091473A - Thermochromism writing utensil - Google Patents

Abstract

The present invention provides a thermochromic writing instrument that enables a stable friction operation using a friction portion at the rear end of a knock body.
A thermochromic ink is accommodated in a cursive body. The writing body 3 is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction. A knock body 6 is provided at the rear end of the shaft tube 2. By pressing the knock body 6 forward, the pen tip 31 is made to protrude from the front end hole 21 of the shaft tube 2. A friction portion 8 is provided on the outer surface of the rear end portion of the knock body 6. An operation portion 9 that can be pressed inward in the radial direction is provided on the side wall of the shaft tube 2. At the time of the friction operation using the friction portion 8, the operation portion 9 is displaced inward in the radial direction by pressing the operation portion 9 inward in the radial direction, and the restriction portion 91 in the radially inward direction of the operation portion 9. Contacts the knock body 6 or the friction portion 8 and prevents the friction portion 8 from moving backward relative to the shaft cylinder 2.
[Selection] Figure 1

Description

The present invention relates to a thermochromic writing instrument.

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 a friction part is provided in the operation part in a type in which the operation part (corresponding to the knock body of the present application) at the rear end of the shaft cylinder is pressed forward, a friction operation is performed using the friction part. There is a possibility that the operation part moves forward by the surface and a stable friction operation cannot be performed. In particular, when both a pen tip protruding operation and a pen tip immersing operation employ a retracting mechanism (so-called double knock type) that pushes the operating portion forward and a friction portion is provided in the operating portion, the pen tip protrudes. In this state, the operating body may rattle in the front-rear direction, and a stable friction operation may not be performed.

International Publication No. 2008/105227 Pamphlet

The present invention is intended to solve the above-described conventional problems, and to provide a thermochromic writing instrument that enables a stable friction operation using a friction portion at the rear end of the knock body. 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.

1st invention of this application stores the thermochromic ink in the inside of the writing body 3, the pen tip 31 which can discharge the said thermochromic ink is provided in the front end of the said writing body 3, and the said writing body 3 is made into a shaft. The cylinder 2 is accommodated so as to be movable in the front-rear direction, a knock body 6 is provided at the rear end of the shaft cylinder 2, and the pen tip 31 is pushed forward by pushing the knock body 6 forward. A protruding and retracting mechanism for releasing the pen tip protruding state by pressing the knock body 6 forward again and bringing the pen tip 31 into the shaft tube 2 from the front end hole 21 of the shaft tube 2 again. A thermal discoloration provided with a friction portion 8 on the outer surface of the rear end portion of the knock body 6 and capable of thermally discoloring the thermochromic ink handwriting by frictional heat generated by rubbing the handwriting of the thermochromic ink. An operation part 9 which is a writing instrument and can be pressed radially inwardly on the side wall of the shaft tube 2. A regulating portion 91 is provided on the radially inner surface of the operating portion 9, and the operating portion 9 is operated by pressing the operating portion 9 radially inward during the friction operation using the friction portion 8. A radially inward restricting portion 91 of the operation portion 9 contacts the knock body 6 or the friction portion 8 to prevent the friction portion 8 from moving backward with respect to the shaft cylinder 2. It is a requirement that

In the thermochromic writing instrument 1 according to the first aspect of the present invention, when the friction part 8 is used for the friction operation, the operation part 9 is displaced radially inward by pressing the operation part 9 radially inward. Then, the restricting portion 91 radially inward of the operation portion 9 comes into contact with the knock body 6 or the friction portion 8 (for example, is locked or pressed), and the movement of the friction portion 8 in the front-rear direction with respect to the shaft cylinder 2 is prevented. The Thereby, a stable friction operation can be performed using the friction portion 8 on the outer surface of the rear end portion of the knock body 6.

According to a second invention of the present application, in the thermochromic writing instrument 1 according to the first invention, the operation portion 9 is formed of an elastic wall portion that is provided on a side wall of the shaft tube 2 and is elastically deformable in a radial direction. It is a requirement that the restricting portion 91 is provided on the radially inner surface of the elastic wall portion.

The thermochromic writing instrument 1 of the second invention can form the operation part 9 and the restriction part 91 with a simple structure without increasing the number of parts.

According to a third invention of the present application, in the thermochromic writing instrument 1 of the first invention, the clip 10 is provided on the outer surface of the side wall of the shaft cylinder 2, and the operation portion 9 is projected rearward from the base portion 10b of the clip 10, It is a requirement that the front end portion of the clip 10 is pressed against the side wall of the shaft cylinder 2 by urging the operation portion 9 radially outward, and the restriction portion 91 is provided on the radially inner surface of the operation portion 9. To do.

The thermochromic writing instrument 1 of the third invention can form the operation portion 9 and the restriction portion 91 with a simple structure without increasing the number of parts.

-Friction part In this invention, it is preferable that the friction part 8 is comprised from an elastic material (soft material). The elastic material constituting the friction portion 8 is preferably a synthetic resin (rubber or elastomer) having elasticity. For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), 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 portion 8 is a low-abrasion elastic material in which almost no wear debris (erasure debris) is generated during friction, compared to a high-abrasion elastic material (for example, an eraser). Preferably it consists of. In addition, the friction part 8 of this invention should just be the structure which the rear end part outer surface consists of an elastic material at least.

-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, and 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 frictional portion 8 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 portion 8.

According to the present invention, a stable friction operation can be performed using the friction portion at the rear end of the knock body 6.

It is a longitudinal cross-sectional view of the 1st Embodiment of this invention. It is a side view of FIG. It is an exploded view which shows the intrusion mechanism of FIG. It is a longitudinal cross-sectional view of the 2nd Embodiment of this invention. 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.
The thermochromic writing instrument 1 of the present embodiment includes a shaft tube 2, a writing body 3 accommodated in the shaft tube 2, and a pen tip 31 of the writing body 3 that can be projected and retracted from a front end hole 21 of the shaft tube 2. And a haunting mechanism. The shaft cylinder 2 includes a cylindrical front shaft 2a and a cylindrical rear shaft 2b connected to the rear end of the front shaft 2a.

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.

For example, the pen tip 31 is composed of only a metal ball pen having a ball rotatably held at the front end, or a synthetic resin pen tip holder holding the rear outer surface of the ball pen tip. There may be. Further, a tail plug having a vent hole through which the ink containing tube 32 and the outside can be vented may be attached to the rear end opening of the ink containing tube 32.

The retracting mechanism is a knock-type retracting mechanism that uses a rotating cam mechanism, and engages with the cam portion 4 formed on the inner surface of the shaft cylinder 2 (the inner surface of the rear shaft 2b) and rotates in contact with the rear end of the writing body 3. A member 5, a knock body 6 that engages with the rotating member 5 and protrudes from the rear end (rear end of the rear shaft 2 b) of the shaft cylinder 2, and is accommodated in the shaft cylinder 2 and biases the writing body 3 backward. It consists of the bullet body 7 (for example, compression coil spring). 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 press the knock body 6 forward.

The cam portion 4 includes a plurality of serrated cam teeth 41 protruding forward, and a cam groove 42 formed between the cam teeth 41 and engaged with the rotating member 5 [see FIG. 3 (c)]. . The rotating member 5 includes three protrusions 51 extending in the longitudinal direction on the outer surface thereof, and the protrusions 51 are engaged with the cam grooves 42 of the cam portion 4 (see FIG. 3B). The knock body 6 includes a guide protrusion 61 that slides in the cam groove 42 of the cam portion 4 and a cam tooth 62 that engages with the rear end of the protrusion 51 of the rotating member 5 at the front end thereof [FIG. 3 (a)].

The friction part 8 is a member formed of an elastic material (for example, silicone resin, SBS resin, SEBS resin, etc.). As shown in FIG. 1, the friction portion 8 is a bottomed cylindrical body having a mounting hole 81 that opens forward. The inner surface of the mounting hole 81 of the friction portion 8 and the rear outer surface of the knock body 6 are fitted.

A U-shaped hole 22 is provided in a radial direction on the side wall of the rear end portion of the shaft tube 2. An elastic wall portion 9 (operation portion) that is elastically deformable in the radial direction is formed in a portion surrounded by the U-shaped hole. A restricting portion 91 is formed on the radially inner surface of the elastic wall portion. During the friction operation using the friction part 8, the elastic wall part 9 is displaced radially inward by pressing the elastic wall part 9 in the radial direction while gripping the rear part of the shaft cylinder 2. A restricting portion 91 is engaged with the engaging portion 83 of the friction portion 8 (the front end of the friction portion 8) on the radially inner surface of the elastic wall portion 9, and the rearward movement of the friction portion 8 with respect to the shaft cylinder 2 is prevented. .

<Second Embodiment>
A second embodiment of the present invention is shown in FIG. The appearance mechanism is the same as that in the first embodiment (see FIG. 3).
The thermochromic writing instrument 1 of the present embodiment includes a shaft tube 2, a writing body 3 accommodated in the shaft tube 2, and a pen tip 31 of the writing body 3 that can be projected and retracted from a front end hole 21 of the shaft tube 2. And a haunting mechanism. The shaft cylinder 2 includes a cylindrical front shaft 2a and a cylindrical rear shaft 2b connected to the rear end of the front shaft 2a.

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.

For example, the pen tip 31 is composed of only a metal ball pen having a ball rotatably held at the front end, or a synthetic resin pen tip holder holding the rear outer surface of the ball pen tip. There may be. Further, a tail plug having a vent hole through which the ink containing tube 32 and the outside can be vented may be attached to the rear end opening of the ink containing tube 32.

The retracting mechanism is a knock-type retracting mechanism that uses a rotating cam mechanism, and engages with the cam portion 4 formed on the inner surface of the shaft cylinder 2 (the inner surface of the rear shaft 2b) and rotates in contact with the rear end of the writing body 3. A member 5, a knock body 6 that engages with the rotating member 5 and protrudes from the rear end (rear end of the rear shaft 2 b) of the shaft cylinder 2, and is accommodated in the shaft cylinder 2 and biases the writing body 3 backward. It consists of the bullet body 7 (for example, compression coil spring). 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 press the knock body 6 forward.

The cam portion 4 includes a plurality of serrated cam teeth 41 protruding forward, and a cam groove 42 formed between the cam teeth 41 and engaged with the rotating member 5 [see FIG. 3 (c)]. . The rotating member 5 includes three protrusions 51 extending in the longitudinal direction on the outer surface thereof, and the protrusions 51 are engaged with the cam grooves 42 of the cam portion 4 (see FIG. 3B). The knock body 6 includes a guide protrusion 61 that slides in the cam groove 42 of the cam portion 4 and a cam tooth 62 that engages with the rear end of the protrusion 51 of the rotating member 5 at the front end thereof [FIG. 3 (a)].

The friction part 8 is a member formed of an elastic material (for example, silicone resin, SBS resin, SEBS resin, etc.). As shown in FIG. 4, the friction part 8 is a bottomed cylindrical body having a mounting hole 81 that opens forward. An engagement hole 82 is formed through the friction portion 8 in the radial direction, and the engagement hole 82 communicates with the attachment hole 81. The inner surface of the attachment hole 81 of the friction portion 8 and the rear outer surface of the knock body 6 are fitted, and the outward projection on the outer surface of the knock body 6 is engaged with the engagement hole 82. An engagement portion 83 (concave portion) is formed on the outer surface of the friction portion 8.

A clip 10 is attached to the side wall of the shaft cylinder 2 (rear shaft 2b). A base portion 10b of the clip 10 is rotatably attached to the side wall of the shaft cylinder 2 (side wall of the rear shaft 2b). Further, an insertion hole 23 is provided in a radial direction in the side wall of the shaft cylinder 2 (rear shaft 2b). When the pen tip is immersed, the engaging portion 83 (concave portion) is positioned radially inward of the insertion hole 23.

The operation unit 9 protrudes behind the base of the clip 10. A clip elastic body 11 (for example, a compression coil spring) is disposed between the radially inner surface of the operating portion 9 and the radially outer surface of the shaft cylinder 2 side wall (rear shaft 2b side wall). Is biased towards. Thereby, the front end portion (ball portion 10a) of the clip 10 is pressed against the side wall of the shaft tube 2. A restricting portion 91 is formed on the radially inner surface of the operation portion 9. The restricting portion 91 is an inward projection that protrudes inward in the radial direction. In the friction operation using the friction portion 8, the restriction portion 91 is operated by pressing the operation portion 9 inward in the radial direction against the urging force of the clip projectile body 11 in the pen tip immersion state. Through the insertion hole 22 of the shaft cylinder 2, it is engaged with the engaging portion 83 (concave portion) of the friction portion 8. As a result, the rearward movement of the friction portion 8 relative to the shaft cylinder 2 is prevented.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Front end hole 22 U-shaped hole 23 Insertion hole 2a Front shaft 2b Rear shaft 3 Writing body 31 Pen tip 32 Ink storage tube 4 Cam part 41 Cam tooth 42 Cam groove 5 Rotating member 51 Projection Article 6 Knock body 61 Guide protrusion 62 Cam tooth 7 Ejector 8 Friction part 81 Attachment hole 82 Engagement hole 83 Engagement part (recess)
9 Operation part 91 Restriction part 10 Clip 10a Ball part 10b Base 11 Clip bullet

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 knock body is provided at the rear end of the shaft cylinder, the pen body is made to protrude from the front end hole of the shaft cylinder by pressing the knock body forward, and the pen body is again pressed by pressing the knock body forward. It is equipped with a retracting mechanism that releases the tip protruding state and makes the pen tip immerse into the shaft tube from the front end hole of the shaft tube, and rubs the handwriting of the thermochromic ink on the outer surface of the rear end of the knock body. A thermochromic writing instrument provided with a frictional part capable of thermally discoloring the handwriting of the thermochromic ink with frictional heat generated on the shaft cylinder side wall, provided with an operation part capable of being pressed inward in the radial direction, A restricting portion is provided on a radially inner surface of the operation portion, and a friction operation using the friction portion is performed. At this time, by pressing the operating portion radially inward, the operating portion is displaced radially inward, and the radially inward restricting portion of the operating portion is applied to the knock body or the friction portion. A thermochromic writing instrument that contacts and prevents the friction part from moving backward with respect to the shaft cylinder. The operating portion is formed of an elastic wall portion that is provided on a side wall of the shaft tube and is elastically deformable in a radial direction,
The thermochromic writing instrument according to claim 1, wherein the restricting portion is provided on the radially inner surface of the elastic wall portion. A clip is provided on the outer surface of the side wall of the shaft cylinder, the operating portion protrudes rearward from the base of the clip, and the operating portion is urged radially outward to press the front end of the clip against the side wall of the shaft tube. The thermochromic writing instrument according to claim 1, wherein the restriction portion is provided on a radially inner surface of the operation portion.

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