JP2017039207A - Thermochromic writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermochromic writing instrument in which no operation inhibition occurs, such as opening of a lid body during a friction operation time, even if the writing instrument has a friction part on a rotary structure lid body, in which a handwriting written by a thermochromic ink can be discolored by frictional discoloration reliably, and excellent in operation ability and convenience.SOLUTION: A writing instrument comprises a lid body for exposing and closing a rear end of a barrel, on the rear part of the barrel. A substrate part which protrudes from an outer face of the barrel is formed on a rear side face of the barrel, and an engagement part disposed on one end of the lid body is engaged with a hinge part which is formed on the substrate part, for engaging the lid body rotatably. A fitting part of the lid body is detachably fitted to a fitted part which is formed on a rear end part of the barrel, for exposing and closing the rear end of the barrel. The lid body comprises a friction part for applying friction to a handwriting written by a thermochromic ink, in such a manner that the friction part protrudes in a vertical direction, and a regulation part for regulating use of the friction part is provided on a position which is the other side of the engagement part, with respect to the friction part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a thermochromic writing instrument. More specifically, the present invention relates to a thermochromic writing instrument having an openable / closable lid at the rear end portion of the shaft tube.

Conventionally, as a writing instrument comprising a lid that exposes and closes the rear end of the shaft tube at the rear end of the shaft tube, an opening for opening a sliding groove rearward is provided at the rear end of the shaft tube, A writing instrument having a configuration in which a writing body with a sliding body can be removed and inserted from an opening, and a lid for closing the opening is rotatably attached to a hinge provided on a shaft cylinder (for example, a patent) Reference 1).
Further, in the writing instrument having the above configuration, in order to improve convenience when the thermochromic ink is accommodated in the cursive body, a friction body made of an elastic material is provided on the outer surface of the lid body, and the thermochromic handwriting is formed by the friction body. Has been disclosed (see, for example, Patent Documents 2 and 3).

JP 2007-38635 A JP 2010-260218 A JP 2013-95016 A

  In the thermochromic writing instrument, when rubbing the handwriting with the thermochromic ink, the friction operation is performed by repeating the reciprocating rubbing motion with the vicinity of the tip (convex curved surface portion) of the friction body formed on the lid contacting the paper surface. It is what is done. At that time, the position of the friction body (friction portion) that comes into contact with the paper surface is not limited. For this reason, when the friction body and the paper surface are brought into contact with each other at a position opposite (symmetrical) to the hinge side of the lid body, the friction body can be easily opened or rattled. The writing body with sliding body (refill with lever) accommodated in the shaft cylinder may pop out due to obstruction or opening of the lid.

  The present invention does not obstruct operation such as opening the lid during a friction operation, even if the writing body is provided with a friction part on the lid of the rotational structure, and reliably changes the handwriting with the thermochromic ink. The present invention provides a thermochromic writing instrument excellent in operability and convenience.

The present invention is a writing instrument provided with a lid that exposes and closes the rear end of the shaft tube at the rear portion of the shaft tube, and a base portion protruding from the outer surface of the shaft tube is formed on a side surface of the rear portion of the shaft tube. Then, an engaging portion provided at one end of the lid is engaged with a hinge formed on the base to engage the lid rotatably, and a fitting portion of the lid is The rear end of the shaft tube can be exposed and closed by detachably fitting to the fitting portion formed at the rear end portion of the shaft tube, and the lid body rubs the handwriting with the thermochromic ink. And a thermochromic writing instrument that includes a friction portion that protrudes in a vertical direction and that includes a restriction portion that restricts the use of the friction portion at a position on the other end side of the engagement portion with respect to the friction portion. To do.
Furthermore, it is a requirement that the vertical height of the restricting portion is substantially the same as the tip of the friction portion, and that the side surface of the restricting portion serves as a pressing portion when the lid is rotated.
Furthermore, it is a requirement that the restricting portion is formed integrally with the lid, and the friction portion is formed by attaching the friction body to the lid.
In the present invention, “front” refers to the pen tip side of the writing instrument, and “rear” refers to the opposite side. Further, “lower” is the axial tube side of the lid, and “upper” indicates the opposite side.

  According to the present invention, by providing a restricting portion for restricting the use of the friction portion at a position symmetrical to the hinge side via the friction portion of the lid, in addition to the hinge portion serving as a fulcrum for the lid to rotate The friction part on the end side cannot be used during the friction operation, and the friction part on the hinge part side is inevitably used. For this reason, even a thermochromic writing instrument having a friction part on a rotating lid that exposes and closes the rear end of the shaft tube, the lid opens or fluctuates during the friction operation. Since there is no hindrance, the operability and convenience for reliably rubbing the handwriting with the thermochromic ink can be improved. Furthermore, since the side surface of the restricting portion also serves as a pressing portion when the lid is opened, the operability can be increased so that the lid can be opened with a lighter force.

It is an external view which shows an example of the thermochromic writing instrument of this invention. It is an external view of the state which open | released the cover body of the thermochromic writing instrument of FIG. It is a principal part expansion perspective view of FIG. It is a principal part expansion perspective view at the time of friction operation with the writing instrument of FIG. It is an external view which shows an example of the thermochromic writing instrument of this invention.

  Embodiments of the thermochromic writing instrument of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

<First embodiment>
The thermochromic writing instrument 1 according to the first embodiment shown in FIGS. 1 to 4 includes a plurality of (five) writing bodies in the front-rear direction in a shaft cylinder body to which the front shaft 2 and the rear shaft 3 are screwed. It is housed movably. A sliding body 9 having the same color (black) as the colored state of the thermochromic ink accommodated in the ink accommodating cylinder of the cursive body is disposed at the rear part of the cursive body, and the cursive body is urged rearward by a coil spring. The Although the details of the writing body are not shown, it is a slide type multi-core writing instrument of a conventionally known retracting mechanism in which other four writing bodies with sliding bodies are arranged in the same manner as the above-described configuration. is there.

  The cursive body is a ballpoint pen refill. Specifically, a pen tip portion in which a ball is rotatably held at the tip of the ink containing cylinder is mounted, and the inside of the ink containing cylinder is transparent from black to heat. The thermochromic ink having shear thinning viscosity and the ink follower are directly accommodated. Similarly, the other four writing bodies are equipped with a ballpoint pen tip at the tip of the ink storage cylinder, and each pen is directly containing the ink follower with thermochromic ink of different colors. Refill. Note that it is sufficient that the cursive body contains at least one thermochromic ink, and a ballpoint pen containing non-thermochromic water-based ink, oil-based ink, and emulsion ink in addition to the above-mentioned ballpoint pen refill. A refill provided with a chip or a marker chip or a mechanical pen unit can be applied, and an eraser unit, a touch pen unit, or the like can also be used.

The thermochromic ink can be used regardless of reversible thermochromic property or irreversible thermochromic property as long as it changes color by rubbing heating (frictional heat) by the friction part 8, for example, an aqueous gel ink having shear thinning viscosity, General-purpose inks such as low-viscosity water-based inks, low-viscosity oil-based inks, high-viscosity oil-based inks, and emulsion inks can be used depending on the type of chip. In addition, as a high temperature side discoloration point (namely, temperature which discolors by heating) of the thermochromic material (coloring agent) added to ink, it is preferable to set in the range of 45-95 degreeC, especially by friction heat. Considering discoloration / erasability, 60 to 85 ° C. is more preferable.
The thermochromic ink may be a general-purpose dye, pigment, metallic luster pigment, fluorescent pigment, titanium oxide, photochromic material, or the like, together with a thermochromic material as a colorant.

Five elongated sliding grooves extending in the front-rear direction are formed at the rear portion of the rear shaft 3 and are formed at substantially equal intervals. Each sliding groove has an opening at the rear and an opening communicating with the rear end of the rear shaft 3.
Although not shown, a substantially cylindrical spring support portion is fixed inside the rear shaft 3. In the spring support portion, an inner hole through which five writing bodies are inserted penetrates in the axial direction, and a coil spring is arranged between the spring support portion and each of the sliding bodies 9, 10 and 11, and the writing body. And the sliding body is urged backward.

A concave mounting groove extending along the longitudinal direction is formed in the rear part of the rear shaft 3 (between the two sliding grooves), and a clip 7 is attached to the mounting groove. The clip 7 is fixed to the rear shaft 3 by drop fitting.
Further, at the rear part of the clip 7, a base part 7a is extended so as to protrude from the outer surface of the shaft cylinder, and a circular concave hole-like hinge part 7b is formed at a symmetrical position sandwiching the outer surface of the base part 7a. The hinge portion 7b is engaged with an engaging portion 5a provided at one end of a substantially disc-shaped lid 5 made of polyacetal and extending left and right when the clip 7 is viewed from the front, and the lid 5 is rotated. The rear end 3a of the rear shaft 3 can be exposed by freely engaging and rotating the lid 5. Specifically, a cylindrical protrusion is formed at the engaging position of the engaging portion 5a at a symmetrical position sandwiching the outer surface of the base portion 7a, and the engaged state (pivot attachment) with the hinge portion 7b is maintained. Yes.

  Further, a through-hole serving as a fitting portion is formed in the center of the lid 5 in the axial direction, and a fitting projection is formed on the inside thereof. When the lid 5 closes the rear end 3a of the rear shaft 3, a fitting portion (protrusion) is formed on the fitted portion 3d formed in the rear end portion of the rear shaft 3 in the axial direction and protruding rearward. The lid 5 is fitted to the rear shaft 3 so as to be openable and closable by getting over and fitting.

Furthermore, a substantially dome-shaped crown 4 made of polycarbonate is attached to the lid 5, and a bullet-type friction body 8 made of SEBS is attached to the top of the lid 5.
Specifically, one side wall (hinge side) of the crown 4 is formed as a plane portion that is chamfered substantially vertically, and a support plane of a support portion that extends above the lid 5 when the crown is mounted. It will be in the state which touched a part. In addition, the said support part is extended in the orthogonal | vertical direction from the cover body in the engaging part 5a side of the cover body 5, and converts radial pressing force into the fitting release force of an axial direction. .

Further, on the other side wall (that is, the other end side of the engaging portion 5 a of the lid 5) that is in a substantially symmetrical position across the hinge side wall and the friction body 8, a columnar restricting portion 6 is provided on the crown 4. It is provided by being integrally molded with.
The restricting portion 6 extends in a non-contact state at substantially the same height as the top of the friction body 8, and its side surface acts as a pressing portion 6a with which the fingertip comes into contact during a pressing operation (see FIG. 3). The pressing portion 6a can be provided with a position indication indicating an optimal location during the pressing release operation, and a depression, unevenness, groove or the like for improving the grip performance of the fingertip.
By providing the restricting portion 6, when the user scratches the thermochromic handwriting on the paper surface with the friction body 8, the friction portion 8 is placed on the hinge side of the friction body 8 in order to avoid the restriction portion 6 from coming into contact with the paper surface. It will be used as (a part in contact with the paper surface P). For this reason, there is no possibility that the lid 5 is opened even by pressing or rubbing with a strong force, and the lid is supported by a structure in which the hinge portion is stable, and rattling is suppressed (see FIG. 4).
The restricting portion 6 is formed so that the friction member 8 on the restricting portion side does not come into contact with the paper surface at the time of friction, and the shape, material, and the like are not particularly limited as long as the object is achieved.

The friction body (friction portion) 8 may be any one in which a friction portion for decoloring or discoloring the handwriting by friction heat is disposed in whole or in part on the crown 4 or the lid body 5. In addition to being attached to the head crown 4 and the lid body 5, the head crown 4 and the lid body 5 itself may be used as the friction body 8.
As the friction body, an elastic body such as an elastomer that is rich in elasticity and can generate frictional heat by generating appropriate friction during friction, or a plastic foam is preferable.
Materials for the friction body (friction part) include thermoplastic elastomers such as olefin, styrene, urethane, polyester, and fluorine, silicone, epoxy, urethane, melamine, urea, and phenol. In particular, silicone resins, SEBS resins (styrene ethylene butylene styrene block copolymers), SBS resins (styrene butadiene styrene copolymers), polyester resins, and the like are preferably used. Furthermore, in consideration of moldability, a blend of a hard resin and an elastic material such as a mixture of a polypropylene resin and a styrene thermoplastic elastomer, a mixture of a polypropylene resin and a polypropylene thermoplastic elastomer, and the like can also be applied. Although the handwriting can be rubbed using an eraser, the above-mentioned elastic body is preferably used because erase scraps are generated at the time of friction.

In order to project the pen tip (ballpoint pen tip) of the writing body accommodated in the shaft cylinder from the tip opening 2a of the front shaft 2, the operating portion 9a of the sliding body 9 is moved along the sliding groove along the front shaft 2 By sliding in the direction of the front end opening 2a, the engagement protrusion formed on the sliding body 9 is engaged with the engagement portion formed in the rear shaft 3, and the pen tip portion of the writing body is opened at the front end of the front shaft. The protrusion can be maintained by selecting from the portion 2a. The sliding body 9 is provided with a release protrusion.
By sliding the operation parts 10a and 11a of the other sliding bodies 10 and 11 in the direction of the front end opening 2a of the front shaft 2 in a state where the pen tip part of the writing body maintains the protrusion from the front end opening 2a. The release protrusions of the moving bodies 10 and 11 release the locking of the sliding body 9 via the sleeve, and the pen tip portion of the writing body that protrudes first can be immersed in the front shaft 2.

  When the cursive body is replaced, from the state in which the lid 5 closes the rear end 3a of the rear shaft 3, the pressing portion 6a of the restricting portion 6 is pressed to the hinge side (in the direction of arrow F in FIG. 3). The fitting portion is released from the fitting portion 3b of the rear shaft 3, and the lid body 5 is rotated to expose the rear end 3a of the rear shaft 3. At this time, the lid 5 can be easily released by pressing the regulating portion 6 (pressing portion 6a) with a fingertip such as the belly of the thumb, so that the replacement work can be performed regardless of the length of the nail or the force of the finger. It becomes possible to carry out efficiently.

  When the disengaged lid body 5 is rotated and the rear end 3a of the rear shaft 3 is exposed, each sliding body 9, 10, 11 (others not shown) is attached to the rear side of the coil spring from the sliding groove. It is protruded rearward by the force. By taking out the sliding body 9 from the writing instrument main body from this state, the writing body (writing body with sliding body) that is connected to the sliding body 9 is taken out from the rear shaft 3, and then a new one that is connected to each other after that. A writing body and a new sliding body are inserted into the rear shaft 3 through a sliding groove having an open rear end. Then, the lid body 5 is rotated forward (opposite the hinge portion), and then the fitting portion of the lid body 5 and the fitted portion 3b of the rear shaft 3 are fitted to each other. 3a is closed. As a result, the replacement work of the writing body and the sliding body is completed, so that the user can replace the writing body and the sliding body corresponding to the user's preference in the shaft cylinder, and the writing body and the sliding body can be quickly and reliably stored. Can be replaced.

<Second Embodiment>
In the thermochromic writing instrument 1 of the second embodiment shown in FIG. 5, a plurality of (three) writing bodies can move in the front-rear direction in a shaft cylinder body to which the front shaft 2 and the rear shaft 3 are attached by screwing. Is housed in. Furthermore, a lid for opening and closing the rear end of the shaft cylinder is provided at the rear part of the writing body. In addition, since the structure and configuration other than the lid 5 are substantially the same as those of the first embodiment, the description thereof is omitted.

  The lid 5 is a molded product made of colored polyacetal resin in which a bullet type friction body 8 made of styrene elastomer is mounted at a substantially central position, and an engaging portion that extends to the left and right when the clip 7 is viewed from the front. 5a is provided at one end portion, and a restricting portion 6 extending upward in the vertical direction is provided at the other end portion. The restricting portion 6 extends upward in the vertical direction at substantially the same height as the top of the friction body 8 at a position that is substantially symmetric with the engagement portion 5a via the friction body 8, and has a radial pressing force. F is converted into a fitting release force in the axial direction. In this embodiment, the lid body is integrally formed. However, a separate body can be attached to the lid body and used.

  Further, the outer surface of the restricting portion 6 (the side wall that is substantially symmetrical with the hinge side) acts as a pressing portion 6a with which the fingertip stably contacts when performing a pressing operation when the lid is opened. A recessed finger hook is formed. In addition, although it is not essential to form a finger hook part etc. in the location used as the press part 6a, since it becomes the position display which shows the optimal location at the time of press release operation, and the grip property of a fingertip improves, it forms. It is preferable. In addition, the finger hook portion is not limited to a concave shape as long as it has a three-dimensional shape, and is formed by providing projections and step portions of various shapes at the time of molding, or by post-processing formation by means such as printing, sticking, transfer, etc. It can also be provided. Further, the shape or the like may be a symbol such as an arrow indicating the friction operation location.

  The lid 5 having the restricting portion 6 has a base portion 7a extending from the rear portion of the clip 7 so as to protrude from the outer surface of the shaft cylinder (specifically, a recess formed at a symmetrical position sandwiching the outer surface of the base portion 7a). By engaging the engaging portion 5a with the hole-like hinge portion 7b), the lid body 5 is rotatably engaged, and further by rotating the lid body 5, the rear shaft 3 The rear end 3a can be exposed. Specifically, a cylindrical protrusion is formed at the engaging position of the engaging portion 5a at a symmetrical position sandwiching the outer surface of the base portion 7a, and the engaged state (pivot attachment) with the hinge portion 7b is maintained. Yes.

  Further, a friction body 8 is provided by two-color molding at a substantially center in the axial direction of the lid body 5 (near the axis of the shaft cylinder). The friction body 8 has a bullet-shaped tip side as a friction portion. The through hole is formed so that the rear end side is a fitting portion with the shaft tube. When the lid 5 closes the rear end 3 a of the rear shaft 3, the fitting portion rides over the fitted portion that protrudes toward the rear and is formed in the rear end portion of the rear shaft 3 in the axial direction. Thus, the lid 5 is fitted to the rear shaft 3 so as to be openable and closable.

  In the above structure, the restricting portion 6 is an opening operation portion of the lid body 5 and plays a role of restricting the friction portion of the friction body 8 to a certain location. Therefore, when the user scratches the thermochromic handwriting on the paper surface with the friction body 8, the hinge side of the friction body 8 is used as a friction portion (a portion in contact with the paper surface P) by avoiding the restriction portion 6 naturally. become. Thereby, there is no possibility that the lid body 5 is opened even by pressing or rubbing with a strong force, and the lid body is supported with a stable structure of the hinge portion, and rattling during the rubbing operation is also suppressed.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Front shaft 2a Front opening 3 Rear shaft 3a Rear end 3b Mated part 4 Head crown 5 Lid 5a Engagement part 6 Restriction part 6a Press part 7 Clip 7a Base part 7b Hinge part 8 Friction body ( Friction part)
9, 10, 11 Sliding body 9a, 10a, 11a Operation part F Force F 'when pressed F' Force P when friction P

Claims (4)

A writing instrument having a lid that exposes and closes a rear end of the shaft cylinder at a rear portion of the shaft cylinder, wherein a base portion protruding from an outer surface of the shaft cylinder is formed on a side surface of the rear portion of the shaft cylinder, and the lid An engagement portion provided at one end of the body is engaged with a hinge portion formed on the base portion to engage the lid body rotatably, and the fitting portion of the lid body is connected to the shaft cylinder. By detachably fitting the fitted portion formed at the rear end, the rear end of the shaft tube can be exposed and closed,
The lid body includes a friction portion that rubs the handwriting by the thermochromic ink in a vertical direction, and restricts the use of the friction portion to a position on the other end side of the engagement portion with respect to the friction portion. A thermochromic writing instrument comprising a regulating portion.   The thermochromic writing instrument according to claim 1, wherein the vertical height of the restricting portion is substantially the same as the tip of the friction portion.   The thermochromic writing instrument according to claim 1 or 2, wherein a side surface of the restricting portion serves as a pressing portion when the lid is turned.   The thermochromic property according to any one of claims 1 to 3, wherein the regulating portion is formed integrally with the lid, and the friction portion is formed by attaching the friction body to the lid. Writing instrument.

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