JP2017056632A - Thermochromic writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermochromic writing instrument capable of switching a writing state and an unwritten state by a simple mechanism, without using an elastic member such as a spring of becoming a factor of imparting impact to a refill.SOLUTION: A thermochromic writing instrument comprises a refill 2 for storing thermochromic ink and having a writing part 2a, a barrel 10 for holding the refill 2, an operation member 20 for protruding-retreating the writing part 2a by advancing or retreating by being operated and a friction member 3 for rubbing handwriting by the thermochromic ink and heat-discoloring the handwriting by frictional heat generated in its case, and the friction member is provided on the rear end of the barrel 10, and the operation member 20 is provided in a front part of the barrel 10.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a thermochromic writing instrument.

  Refill that contains thermochromic ink by having an operation part at the rear end of the shaft cylinder and performing a knocking operation that pushes the operation part forward against the biasing force of a spring arranged in the shaft cylinder That is, a so-called knock-type thermochromic writing instrument that can be switched between a writing state in which the writing portion, which is the pen tip of the writing body, protrudes from the tip of the shaft tube and a non-writing state in which the writing portion is immersed in the shaft tube. Is known (Patent Document 1).

Japanese Patent No. 5302881

  In the knock type thermochromic writing instrument, bubbles may be generated in the ink in the refill due to an impact when switching from the writing state to the non-writing state. That is, when switching from the writing state to the non-writing state, the refill moves vigorously backward by the urging force of the spring, and an impact is applied when the refill is stopped. In particular, when low viscosity ink or shear thinning ink is contained in the refill, the ink may retreat due to the impact, and air may be mixed into the refill from the writing portion. In this case, bubbles may be generated in the ink, which may cause poor writing.

  An object of the present invention is to provide a thermochromic writing instrument capable of switching between a writing state and a non-writing state by a simple mechanism without using an elastic member such as a spring that causes an impact on a refill. And

  According to one aspect of the present invention, a writing body containing a thermochromic ink and provided with a writing part, a shaft cylinder that holds the writing body, and the writing part is moved forward or backward by being operated. An operation member to be caused to appear and rub, and a friction part capable of rubbing the handwriting by the thermochromic ink and thermally changing the handwriting with frictional heat generated at that time, and the friction part is provided on the shaft tube. There is provided a thermochromic writing instrument provided at a rear end and having the operation member provided at a front portion of the shaft tube.

  According to another aspect of the present invention, a writing body containing a thermochromic ink and having a writing part, a shaft cylinder that holds the writing body, and the writing part is moved forward or backward by being operated. An operation member that appears and disappears, and a friction part that rubs the handwriting with the thermochromic ink and that can thermally discolor the handwriting with frictional heat generated at that time, and the friction part is attached to the operation member A thermochromic writing instrument is provided, wherein the operation member is provided at a front portion of the shaft tube.

  According to the aspect of the present invention, there is provided a thermochromic writing instrument capable of switching between a writing state and a non-writing state by a simple mechanism without using an elastic member such as a spring that causes an impact on the refill. It has the common effect of doing.

It is a side view of the writing state of the thermochromic writing instrument by the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the thermochromic writing instrument of FIG. It is a longitudinal cross-sectional view of the non-writing state of the thermochromic writing instrument of FIG. It is a side view of the axial cylinder of the thermochromic writing instrument of FIG. It is a longitudinal cross-sectional view of the axial cylinder of FIG. It is a rear view of the operation member of the thermochromic writing instrument of FIG. FIG. 7 is a side view of the operation member of FIG. 6. It is a longitudinal cross-sectional view of the operation member of FIG. It is a side view of the writing state of the thermochromic writing instrument by the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the thermochromic writing instrument of FIG. It is a longitudinal cross-sectional view of the non-writing state of the thermochromic writing instrument of FIG. FIG. 10 is a longitudinal sectional view of the operation member in FIG. 9.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are denoted by common reference symbols throughout the drawings.

  1 is a side view of the writing state of the thermochromic writing instrument 1 according to the first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the thermochromic writing instrument 1 of FIG. 1, and FIG. It is a longitudinal cross-sectional view of the non-writing state of the thermochromic writing instrument 1 of FIG.

  The thermochromic writing instrument 1 includes a shaft cylinder 10 that is a cylindrical member formed in a cylindrical shape, an operation member 20 that is provided in the front portion of the shaft cylinder 10 and is formed in a cylindrical shape, It has a refill 2 that is a writing body that contains a color-changing ink and has a writing portion 2 a at one end, and a friction member 3 that is a friction portion provided at the rear end portion of the shaft tube 10. The refill 2 is held by the shaft tube 10 as will be described later.

  In the present specification, in the axial direction of the thermochromic writing instrument 1, the writing part 2a side is defined as the “front” side, and the opposite side of the writing part 2a is defined as the “rear” side. Further, in the thermochromic writing instrument 1, the operation member 20 moves in the front-rear direction with respect to the shaft tube 10 as will be described later. At this time, a state in which the writing unit 2a protrudes from the operation member 20 is referred to as a writing state (FIGS. 1 and 2), and a state in which the writing unit 2a is immersed in the operation member 20 is referred to as a non-writing state (FIG. 3).

  4 is a side view of the shaft tube 10 of the thermochromic writing instrument 1 of FIG. 1, and FIG. 5 is a longitudinal sectional view of the shaft tube 10 of FIG.

  The shaft cylinder 10 includes a cylindrical shaft cylinder main body 11 whose rear end portion is closed, and a columnar refill extending forward from the inner surface of the closed rear end portion of the shaft cylinder main body 11 beyond the shaft cylinder main body 11. Holding part 12. On the inner peripheral surface of the rear portion of the shaft cylinder main body 11, a convex portion protruding radially inward in a ridge shape is formed in a spiral shape, and this convex portion forms a female screw portion 13 as a whole. The front part 14 of the refill holding part 12 has a smaller diameter than the rear part 15. An annular protrusion 16 is formed on the outer peripheral surface of the rear portion 15 of the refill holding portion 12.

  In addition, an insertion hole 17 is formed in the refill holding part 12 from the front end surface to the rear in order to insert the refill 2. A fitting portion 18 having an inner diameter smaller than that of the front portion is formed at the back of the insertion hole 17, that is, the rear portion. The inner diameter of the fitting portion 18 is substantially the same as or slightly smaller than the outer diameter of the rear end portion of the refill 2. Therefore, the refill 2 inserted into the insertion hole 17 of the refill holding part 12 is fixed and held so as not to be easily removed by fitting the rear end part of the refill 2 and the fitting part 18 of the refill holding part 12. Is done. Note that a hemispherical friction member 3 is provided on the rear end surface of the shaft tube 10 by bonding, two-color molding, or the like.

  6 is a rear view of the operation member 20 of the thermochromic writing instrument 1 of FIG. 1, FIG. 7 is a side view of the operation member 20 of FIG. 6, and FIG. 8 is a longitudinal section of the operation member 20 of FIG. FIG.

  The cylindrical operation member 20 is formed with a through hole 21 penetrating in the front-rear direction. The inner diameter of the through hole 21 decreases from the rear toward the front, and two step portions 22 are formed at the boundary. The inner diameter of the inner peripheral surface 23 at the rear portion of the through hole 21 is set slightly larger than the outer diameter of the rear portion 15 of the refill holding portion 12 of the shaft tube main body 11. The inner peripheral surface 23 at the rear part of the through hole 21 is loosely fitted with the annular protrusion 16 of the refill holding part 12 to prevent the operation member 20 from rattling against the shaft tube 10.

  On the outer peripheral surface of the rear portion of the operation member 20, two convex portions projecting radially inward in a ridge shape are formed symmetrically around the central axis over about half of the entire circumference, and these convex portions are generally male. A screw portion 24 is formed. In addition, the external thread part 24 may form the convex part over a perimeter, and may form three or more.

  In a state where the refill 2 is fitted to the refill holding portion 12, the operation member 20 is attached to the shaft tube 10 so as to insert the refill 2 and the refill holding portion 12 into the through hole 21. In other words, the operation member 20 is inserted into the shaft tube main body 11 of the shaft tube 10. At this time, the female screw part 13 of the shaft tube 10 and the male screw part 24 of the operation member 20 are screwed together, and the operation member 20 is moved forward or backward relative to the shaft tube 10 by rotating the operation member 20. It becomes possible.

  Switching between the writing state and the non-writing state of the thermochromic writing instrument 1 is performed by holding the shaft tube 10 with one hand and performing a rotating operation of rotating the operation member 20 with the other hand. Specifically, when the operation member 20 is rotated in a direction in which the operation member 20 is inserted into the shaft cylinder 10, that is, in a backward direction, the writing portion 2a of the refill 2 fixed to the shaft cylinder 10 is relatively operated. It protrudes from the front end of the member 20, and the thermochromic writing instrument 1 is in a writing state (FIGS. 1 and 2). On the other hand, when the operation member 20 is rotated in a direction in which the operation member 20 protrudes outside the shaft cylinder 10, that is, in a forward direction, the writing portion 2 a of the refill 2 fixed to the shaft cylinder 10 is relatively moved. It becomes immersive and non-written (Fig. 3). In other words, the operation member 20 causes the writing unit 2 a to appear and disappear with respect to the operation member 20 by being operated.

  FIG. 9 is a side view of the writing state of the thermochromic writing instrument 100 according to the second embodiment of the present invention, FIG. 10 is a longitudinal sectional view of the thermochromic writing instrument 100 of FIG. 9, and FIG. It is a longitudinal cross-sectional view of the non-writing state of the thermochromic writing instrument 100 of FIG.

  The thermochromic writing instrument 100 includes a shaft cylinder 110 that is a cylindrical member formed in a cylindrical shape, an operation member 120 that is provided in a front portion of the shaft cylinder 110 and is formed in a cylindrical shape, It has a refill 102 that is a writing body that contains discoloring ink and has a writing portion 102 a at one end, and a tail plug 103 provided at the rear end portion of the shaft tube 110. The refill 102 accommodated in the shaft tube 110 is fixed by fitting the rear end thereof to the inner peripheral surface of the tail plug 103. The tail plug 103 is a cylindrical member formed in a cylindrical shape whose rear end portion is closed, and is a friction member that serves as a friction portion.

  At the front end portion of the shaft tube 110, a tapered portion 110a is formed, and an opening through which the writing portion 102a of the refill 102 projects is formed. The outer peripheral surface of the rear end portion of the shaft tube 110 is formed with a screwing portion 110b into which the tail plug 103 is screwed. The tail plug 103 may be attached to the rear end portion of the shaft tube 110 not by screwing but by fitting between smooth surfaces. On the outer peripheral surface behind the taper portion 110a of the shaft tube 110, a convex portion that protrudes radially outward in a ridge shape is formed in a spiral shape, and this convex portion forms a male screw portion 124 as a whole.

  12 is a longitudinal sectional view of the operation member 120 of FIG.

  The operation member 120 is a cylindrical member formed in a cap shape. The operation member 120 has an open front end surface. A tapered portion 120a is formed at the front end portion of the operation member 120, and the inner peripheral surface of the tapered portion 120a is complementary to the outer peripheral surface of the tapered portion 110a of the shaft tube 110 as shown in FIG. Is formed. On the inner peripheral surface of the rear portion of the operation member 120, two convex portions projecting radially inwardly in a ridge shape are formed symmetrically around the central axis over about half of the entire circumference, and these convex portions as a whole A female screw portion 113 is formed. In addition, as for the internal thread part 113, the convex part may be formed over a perimeter, and you may form 3 or more.

  The thermochromic writing instrument 100 according to the second embodiment is greatly different from the thermochromic writing instrument 1 according to the first embodiment in that a male screw portion 124 is formed on the shaft tube 110 side and a female screw is provided on the operation member 120 side. The point is that the portion 113 is formed. The shaft tube 110 and the operation member 120 are screwed together, and the operation member 120 is rotated to move the operation member 120 forward or backward with respect to the shaft tube 110, so that the writing unit 102 a appears and disappears. Are the same.

  Since the thermochromic writing instrument according to the present invention is switched between the writing state and the non-writing state without using an elastic member such as a spring, the impact at the time of switching is different from that of the conventional knock type thermochromic writing instrument. There is no refill. Therefore, problems such as poor writing due to impact do not occur. That is, the thermochromic writing instrument can be switched between a writing state and a non-writing state by a simple mechanism without using an elastic member such as a spring.

  The refill contains thermochromic ink as described above. Here, the thermochromic ink means that a predetermined color (first color) is maintained at room temperature (for example, 25 ° C.), and when the temperature is raised to a predetermined temperature (for example, 60 ° C.), the color changes to another color (second color). The ink has a property of returning to the original color (first color) when cooled to a predetermined temperature (for example, −5 ° C.). In the thermochromic writing instrument 1 using the thermochromic ink, the second color is made colorless and the stroke drawn with the first color (for example, red) is heated to make it colorless, here called “erasing”. I will do it. Accordingly, the frictional member rubs against the writing surface on which the drawn line is written to generate frictional heat, thereby changing the drawn line to colorless, that is, erasing it. Of course, the second color may be a color other than colorless. Note that a ballpoint pen containing a thermochromic ink, a mechanical pencil containing a thermochromic core, a pencil holder, or the like can also be used as the writing body.

  Rubber elastic materials such as thermosetting rubber such as silicone rubber, nitrile rubber, ethylene propylene rubber, ethylene propylene diene rubber, and thermoplastic elastomer such as styrene elastomer, olefin elastomer, polyester elastomer, etc. A mixture of two or more rubber elastic materials and a mixture of a rubber elastic material and a synthetic resin can be used. This is a wear test (ASTM D1044) defined in JIS K7204 and a load of 9.8 N, 1000 rpm environment. Below, it is comprised so that the Taber abrasion amount in the abrasion wheel CS-17 of a Taber abrasion tester may be 10 mg or more, and a friction member is formed. Furthermore, in order to adjust the Taber wear amount to be 10 mg or more, alkylsulfonic acid phenyl ester, cyclohexanedicarboxylic acid ester and phthalic acid plasticizer are added to the friction member material for more flexibility. May be. Since the friction member contains alkyl sulfonic acid phenyl ester, cyclohexanedicarboxylic acid ester and phthalic acid plasticizer, the friction member is more easily worn, so that the handwriting is not damaged and the printed characters are not distorted. Can be deleted. Further, the friction member preferably has a durometer D hardness of 30 or more as defined in JIS K6203. Thereby, a predetermined hardness can be ensured and a more stable rubbing operation can be achieved. The friction member can also be applied as a touch pen or a stylus pen.

  ABS resin, polyethylene resin, polystyrene resin, polypropylene resin, acrylic resin, polycarbonate resin, polyacetal resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyamide resin, acrylonitrile suitable for injection molding as materials for forming the shaft cylinder and operation member Various materials such as styrene resin, modified polyphenylene ether resin, and elastomer resin can be used.

  Note that either or both of the shaft tube and the operation member may be formed of the above-described material of the friction member, and may be used as a friction portion together with the friction member or instead of the friction member. According to the embodiment described above, by rotating the operation member, the operation member is moved forward or backward with respect to the shaft cylinder to be screwed, and the writing unit is projected and retracted. You may comprise so that a writing part may be made to appear by performing operation to move back and forth along. Such a configuration can be realized, for example, by providing a guide groove extending in the axial direction in one of the shaft cylinder and the operation member and providing a protrusion disposed in the guide groove on the other.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Refill 2a Writing part 3 Friction member 10 Shaft cylinder 20 Operation member

Claims (2)

A cursive body containing thermochromic ink and having a writing part;
A shaft cylinder for holding the cursive body;
An operation member that moves forward or backward by operating to make the writing part appear and disappear;
Rubbing the handwriting by the thermochromic ink, and comprising a friction part capable of thermally discoloring the handwriting with frictional heat generated at that time,
The thermochromic writing instrument, wherein the friction portion is provided at a rear end of the shaft tube, and the operation member is provided at a front portion of the shaft tube. A cursive body containing thermochromic ink and having a writing part;
A shaft cylinder for holding the cursive body;
An operation member that moves forward or backward by operating to make the writing part appear and disappear;
Rubbing the handwriting by the thermochromic ink, and comprising a friction part capable of thermally discoloring the handwriting with frictional heat generated at that time,
The thermochromic writing instrument, wherein the friction portion is provided on the operation member, and the operation member is provided on a front portion of the shaft tube.

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