JP6646988B2 - Thermochromic writing instrument - Google Patents

Description

  The present invention relates to a thermochromic writing instrument.

  A refill containing thermochromic ink by performing a knocking operation having an operating portion at the rear end of the barrel and pressing the operating portion forward against the urging force of a spring arranged in the barrel. In other words, the writing part, which is the pen tip of the writing body, is switched between a writing state in which the writing part protrudes from the tip of the barrel and a non-writing state in which the writing part is immersed in the barrel, a so-called knock-type knock-type thermochromic writing implement. Is known (Patent Document 1).

Japanese Patent No. 5302881

  In the knock-type thermochromic writing implement, 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 rearward vigorously by the urging force of the spring, and an impact is applied when the refill stops. In particular, when low-viscosity ink or shear-thinning ink is contained in the refill, the ink retreats due to the impact, and air may enter 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 that can switch 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 having a writing unit, a barrel that holds the writing unit, and the writing unit that moves forward or backward by being operated. An operating member to be moved in and out, and a friction portion capable of rubbing the handwriting by the thermochromic ink and thermally discoloring the handwriting by frictional heat generated at that time, including the friction portion of the shaft cylinder. A thermochromic writing implement is provided at a rear end, wherein the operating member is provided at a front part of the barrel.

  According to another aspect of the present invention, a writing body containing a thermochromic ink and having a writing unit, a barrel that holds the writing unit, and the writing unit moving forward or backward by being operated. An operating member to be moved in and out, and a friction portion capable of rubbing the handwriting by the thermochromic ink and thermally discoloring the handwriting by frictional heat generated at that time, comprising: The thermochromic writing instrument is provided, wherein the operating member is provided at a front portion of the barrel.

  According to an aspect of the present invention, there is provided a thermochromic writing implement that can switch 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. Has the common effect of doing so.

1 is a side view of a writing state of a thermochromic writing instrument according to a first embodiment of the present invention. It is a longitudinal cross-sectional view of the thermochromic writing implement of FIG. It is a longitudinal cross-sectional view of the non-writing state of the thermochromic writing implement of FIG. FIG. 2 is a side view of a barrel of the thermochromic writing instrument of FIG. 1. It is a longitudinal cross-sectional view of the shaft cylinder of FIG. It is a rear view of the operation member of the thermochromic writing implement of FIG. FIG. 7 is a side view of the operation member of FIG. 6. FIG. 7 is a longitudinal sectional view of the operation member of FIG. 6. It is a side view of the writing state of the thermochromic writing implement according to the second embodiment of the present invention. It is a longitudinal cross-sectional view of the thermochromic writing implement of FIG. FIG. 10 is a longitudinal sectional view of the thermochromic writing instrument of FIG. 9 in a non-writing state. FIG. 10 is a longitudinal sectional view of the operation member of 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 a 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. FIG. 2 is a longitudinal sectional view of the thermochromic writing instrument 1 of FIG. 1 in a non-writing state.

  The thermochromic writing implement 1 includes a shaft cylinder 10 that is a cylindrical member formed in a cylindrical shape, an operating member 20 that is provided in front of the shaft cylinder 10 and that is a cylindrical member that is formed in a cylindrical shape, It has a refill 2 which is a writing body that contains a discolorable ink and has a writing part 2 a at one end, and a friction member 3 that is a friction part provided at the rear end of the barrel 10. The refill 2 is held by the barrel 10 as described later.

  In the present specification, in the axial direction of the thermochromic writing instrument 1, the writing portion 2a side is defined as a "front" side, and the opposite side to the writing portion 2a is defined as a "rear" side. Further, in the thermochromic writing instrument 1, the operating member 20 moves in the front-rear direction with respect to the barrel 10 as 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).

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

  The barrel 10 has a tubular barrel body 11 whose rear end is closed, and a column-shaped refill extending beyond the barrel body 11 from the inner surface of the closed rear end of the barrel body 11 to the front. And a holding unit 12. On the inner peripheral surface of the rear portion of the barrel main body 11, a ridge-shaped protruding portion projecting radially inward is spirally formed, and this protruding portion forms a female screw portion 13 as a whole. The front part 14 of the refill holding part 12 is formed smaller in diameter than the rear part 15. An annular projection 16 is formed on the outer peripheral surface of the rear part 15 of the refill holding part 12.

  In addition, an insertion hole 17 is formed in the refill holding portion 12 from the front end face toward the rear 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, at 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 of the refill 2. Therefore, the refill 2 inserted into the insertion hole 17 of the refill holding portion 12 is fixed so as not to be easily removed by fitting the rear end portion of the refill 2 and the fitting portion 18 of the refill holding portion 12, and is held. Is done. A hemispherical friction member 3 is provided on the rear end surface of the barrel 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 that penetrates back and forth. The inside diameter of the through hole 21 becomes smaller from the rear to the front, and two step portions 22 are formed at the boundary. The inner diameter of the inner peripheral surface 23 at the rear part of the through hole 21 is set slightly larger than the outer diameter of the rear part 15 of the refill holding part 12 of the barrel body 11. The inner peripheral surface 23 at the rear part of the through hole 21 is loosely fitted to the annular projection 16 of the refill holding part 12 to prevent the operation member 20 from rattling with the barrel 10.

On the outer peripheral surface of the rear portion of the operating member 20, ridge-shaped two protrusions protruding radially outer side is formed symmetrically about the central axis over about half of the entire periphery, the whole of these protrusions An external thread portion 24 is formed. In addition, the male screw part 24 may form the convex part over the whole circumference, and may form three or more.

  With the refill 2 fitted in the refill holding portion 12, the operation member 20 is attached to the barrel 10 such that the refill 2 and the refill holding portion 12 are inserted into the through holes 21. In other words, the operation member 20 is inserted into the barrel main body 11 of the barrel 10. At this time, the female screw portion 13 of the barrel 10 and the male thread portion 24 of the operating member 20 are screwed together, and the operating member 20 is rotated to move the operating member 20 forward or backward with respect to the barrel 10. It becomes possible.

  Switching between the writing state and the non-writing state of the thermochromic writing implement 1 is performed by holding the barrel 10 with one hand and rotating the operating member 20 with the other hand. Specifically, when the operating member 20 is rotated in a direction in which the operating member 20 is inserted into the barrel 10, that is, in a retreating direction, the writing portion 2 a of the refill 2 fixed to the barrel 10 is relatively operated. The thermochromic writing instrument 1 protrudes from the front end of the member 20, and enters a writing state (FIGS. 1 and 2). On the other hand, when the operating member 20 is rotated in a direction in which the operating member 20 protrudes out of the barrel 10, that is, in a forward direction, the writing portion 2 a of the refill 2 fixed to the barrel 10 relatively moves the operating member 20. Immersed in the interior and become non-written (FIG. 3). In other words, the operating member 20 causes the writing unit 2a to protrude and retract from the operating member 20 when operated.

  FIG. 9 is a side view of a 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. FIG. 10 is a longitudinal sectional view of the thermochromic writing instrument 100 of FIG. 9 in a non-writing state.

  The thermochromic writing instrument 100 includes a shaft cylinder 110 which is a cylindrical member formed in a cylindrical shape, an operating member 120 which is provided in front of the shaft cylinder 110 and is a cylindrical member formed in a cylindrical shape, and It has a refill 102 which is a writing body containing a color-changing ink and has a writing portion 102a at one end, and a tail plug 103 provided at the rear end of the barrel 110. The refill 102 accommodated in the barrel 110 is fixed by fitting its rear end to the inner peripheral surface of the tail plug 103. The tail plug 103 is a tubular member formed in a tubular shape with a closed rear end, and is a friction member that plays a role as a friction portion.

  A tapered portion 110a having a tapered shape is formed at the front end of the barrel 110, and an opening from which the writing portion 102a of the refill 102 projects is formed. A threaded portion 110b with which the tail plug 103 is screwed is formed on the outer peripheral surface of the rear end of the barrel 110. Note that the tail plug 103 may be attached to the rear end of the barrel 110 by fitting flat surfaces instead of screwing. On the outer peripheral surface behind the tapered portion 110a of the shaft cylinder 110, a ridge-shaped projecting portion projecting radially outward is formed in a spiral shape, and the projecting portion forms a male screw portion 124 as a whole.

  FIG. 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 having a tapered shape is formed at the front end of the operation member 120, and the inner peripheral surface of the tapered portion 120a complements the outer peripheral surface of the tapered portion 110a of the barrel 110 as shown in FIG. Is formed. On the inner peripheral surface of the rear portion of the operation member 120, two convex portions protruding radially inward like a ridge are formed symmetrically about the central axis over about half of the entire circumference, and these convex portions are formed as a whole. A female screw portion 113 is formed. In addition, the female screw portion 113 may be formed with the convex portion over the entire circumference, or may be formed with three or more.

  The thermochromic writing instrument 100 according to the second embodiment is significantly different from the thermochromic writing instrument 1 according to the first embodiment in that a male screw portion 124 is formed on the barrel 110 and a female screw is formed on the operation member 120. This is the point where the portion 113 is formed. In that the shaft cylinder 110 and the operating member 120 are screwed together and the operating member 120 is rotated, the operating member 120 is moved forward or backward with respect to the shaft cylinder 110, and the writing unit 102a is retracted. Are identical.

  The thermochromic writing instrument according to the present invention switches between a writing state and a non-writing state without using an elastic member such as a spring, so that the impact at the time of switching as in the conventional knock-type thermochromic writing instrument is performed. It does not participate in refills. Therefore, problems such as poor writing due to the impact do not occur. That is, the thermochromic writing instrument can switch between the writing state and the non-writing state by a simple mechanism without using an elastic member such as a spring.

  The refill contains the thermochromic ink as described above. Here, the thermochromic ink is a color that maintains a predetermined color (first color) at normal temperature (for example, 25 ° C.) and changes to another color (second color) when heated to a predetermined temperature (for example, 60 ° C.). And then returns 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, making the second color colorless and raising the temperature of the drawing line written in the first color (for example, red) to make it colorless is herein referred to as "erasing". It shall be. Therefore, the writing surface or the like on which the drawing line is written is rubbed by the friction member to generate frictional heat, thereby changing the drawing line to colorless, that is, erasing. 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 rubbers such as silicone rubber, nitrile rubber, ethylene propylene rubber, and ethylene propylene diene rubber, and thermoplastic elastomers such as styrene-based elastomers, olefin-based elastomers, and polyester-based elastomers, A mixture of two or more types of rubber elastic materials and a mixture of a rubber elastic material and a synthetic resin can be used. The mixture is subjected to a wear test (ASTM D1044) specified in JIS K7204 under a load of 9.8 N and an environment of 1000 rpm. Below, a Taber abrasion tester is configured so that the amount of Taber abrasion on the abrasion wheel CS-17 is 10 mg or more to form a friction member. Furthermore, in order to adjust the Taber abrasion amount to be 10 mg or more, phenyl alkylsulfonate, cyclohexanedicarboxylate, and phthalate plasticizer are added to the material of the friction member to provide more flexibility. May be. Since the friction member contains alkyl sulfonic acid phenyl ester, cyclohexanedicarboxylic acid ester or phthalic acid-based plasticizer, the friction member is more easily abraded. Can be erased. Further, it is desirable that the friction member has a durometer D hardness specified in JIS K6203 of 30 or more. Thereby, a predetermined hardness can be secured, and a more stable rubbing operation can be performed. In addition, the friction member can be applied as a touch pen and a stylus pen.

  As a material for forming the barrel and the operating member, 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. Various materials such as a styrene resin, a modified polyphenylene ether resin, and an elastomer resin can be used.

  Note that one or both of the barrel and the operating member may be formed of the above-described material of the friction member, and may be used as a friction portion together with or instead of the friction member. According to the above-described embodiment, the operating member is rotated to operate, so that the operating member is moved forward or backward with respect to the shaft barrel to be screwed in and the writing portion is made to protrude and retract, but the operating member is moved in the axial direction. The writing unit may be configured to appear and disappear by performing an operation of moving the writing unit back and forth along. Such a configuration can be realized, for example, by providing a guide groove extending in the axial direction on one of the shaft cylinder and the operation member, and providing a protrusion arranged in the guide groove on the other.

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

Claims (2)

Cursive with thermochromic ink,
A barrel for holding the cursive,
An operating member for moving the writing unit forward or backward by being rotated and retracting the writing unit;
Rubbing the handwriting by the thermochromic ink, and a friction portion capable of thermally discoloring the handwriting by frictional heat generated at that time,
The friction portion is provided at a rear end of the barrel, and the operating member is provided at a front portion of the barrel,
On the outer peripheral surface of the rear portion of the operation member, two convex portions protruding radially outward in a ridge shape are formed symmetrically around a central axis over about half of the entire circumference, and the convex portions are entirely male. A thermochromic writing implement characterized by forming a screw portion and switching between a writing state and a non-writing state without using an elastic member . Cursive with thermochromic ink,
A barrel for holding the cursive,
An operating member for moving the writing unit forward or backward by being rotated and retracting the writing unit;
Rubbing the handwriting by the thermochromic ink, and a friction portion capable of thermally discoloring the handwriting by frictional heat generated at that time,
The friction member is provided on the operation member, the operation member is provided on a front portion of the barrel ,
At the front end of the operation member, a tapered tapered portion is formed, and an inner peripheral surface of the tapered portion is formed complementarily to an outer peripheral surface of the barrel,
On the inner peripheral surface of the rear portion of the operating member, two convex portions protruding radially inward in a ridge shape are formed symmetrically around the central axis over about half of the entire circumference, and the convex portions are female screws. A thermochromic writing implement characterized by forming a portion and switching between a writing state and a non-writing state without using an elastic member .

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