JP2018108663A - Thermochromic writing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermochromic writing tool capable of surely preventing movement in a cross direction of a friction part when a friction operation is performed using the friction part.SOLUTION: A front cam portion 93 formed of a projection and a recess is provided on a front end of a knock member 8, and a rear cam portion 71 which is engageable with the front cam portion 93 of the knock member 8 is formed of the projection and the recess is provided on the rear end of a cam member 5. The knock member 8 is structured so as to be rotatable with respect to a barrel 2, and a regulation wall 10b abutted to a rear end of the barrel 2 is formed on the outer surface of the knock member 8. When the projection of the front cam portion 93 of the knock member 8 and the recess of the rear cam portion 71 of the cam member 5 are in an engaged state, or when the recess of the front cam portion 93 of the knock member 8 and the projection of the rear cam portion 71 of the cam member 5 are in an engaged state, the regulation wall 10b of the knock member 8 and the rear end of the barrel 2 are abutted to each other, and forward movement of the knock member 8 is prevented.SELECTED DRAWING: Figure 2

Description

The present invention relates to a thermochromic writing instrument.

Conventionally, for example, Patent Document 1 discloses that a friction portion capable of thermally changing the handwriting of the thermochromic ink by frictional heat generated by rubbing the handwriting of the thermochromic ink on the outer surface of the rear end portion of the knock body. In the thermochromic writing instrument provided with the friction part, when the friction operation is performed using the friction part, the knock body is rotated, the friction part bulges outward in the radial direction, the inner surface of the shaft tube and the friction part are pressed, and the friction is caused. The structure which prevents the movement of the front-back direction of a part is disclosed.

JP 2012-223950 A

The thermochromic writing instrument disclosed in Patent Document 1 has a structure using a pressure contact holding force (that is, a frictional force) between the friction portion and the inner surface of the shaft tube. The pressure holding force between the friction part and the inner surface of the shaft cylinder is affected by the surface state of the inner surface of the shaft cylinder or the friction part, so that when the friction operation is performed using the friction part, the movement of the friction part in the front-rear direction is ensured. May not be able to stop.

The present invention is intended to solve the above-described conventional problems and to provide a thermochromic writing instrument that can reliably prevent the frictional portion from moving in the front-rear direction when the frictional operation is performed using the frictional portion. It is.

In the present invention, “front” refers to the pen body side, and “rear” refers to the opposite side. In the present invention, the “pen nib immersive state” refers to a state where the pen nib is immersed in the shaft cylinder, and the “pen nib protruding state” refers to a state where the pen nib projects outside from the front end of the shaft cylinder. .

The thermochromic writing instrument 1 according to the first invention of the present application contains a thermochromic ink inside a writing body 3, and a pen tip 31 capable of discharging the thermochromic ink is provided at the front end of the writing body 3. The writing body 3 is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, a knock member 8 is provided at the rear end of the shaft cylinder 2, and the pen tip 31 is pressed by pressing the knock member 8 forward. By projecting from the front end hole 21 of the shaft tube 2 and pressing the knock member 8 forward again, the pen tip projecting state is released, and the pen tip 31 is moved into the shaft tube 2 from the front end hole 21 of the shaft tube 2. Friction that includes a retracting mechanism that makes the immersion state, and that can rub the thermochromic ink handwriting on the outer surface of the rear end portion of the knock member 8 and thermally change the handwriting of the thermochromic ink by frictional heat generated at that time. A thermochromic writing instrument provided with a portion 10c, wherein the intrusion mechanism is A plurality of cam teeth 24 and cam grooves 25 that are formed on the inner surface of the shaft cylinder 2 and are arranged alternately along the circumferential direction and extend in the front-rear direction, and are rotatable with respect to the shaft cylinder 2 behind the writing body 3 And a rotating member 4 having a plurality of protrusions 41 that can be alternately engaged with the cam teeth 24 or the cam grooves 25, and cannot be rotated with respect to the shaft cylinder 2 behind the rotating member 4. A plurality of cam projections 61 that are arranged so as to be movable in the front-rear direction, have a plurality of cam projections 61 that rotate the rotating member 4, and a plurality of engagement projections 62 that are engaged with the cam grooves 25 on the inner surface of the shaft cylinder 2 so A cam member 5, a knock member 8 that presses the cam member 5 forward, and a projecting body 11 that biases the writing body 3 backward, and a convex portion at the front end of the knock member 8. And a front cam portion 93 comprising a recess, and the cam member A rear cam 71 having a convex portion and a concave portion engageable with the front cam portion 93 of the knock member 8 is provided at the rear end, and the knock member 8 is configured to be rotatable with respect to the shaft cylinder 2. The knock member 8 protrudes rearward from the rear end hole 22 of the shaft cylinder 2, and a regulating wall portion 10 b that can contact the rear end of the shaft cylinder 2 is formed on the outer surface of the knock member 8, and the knock member 8 when the convex portion of the front cam portion 93 and the convex portion of the rear cam portion 71 of the cam member 5 are in contact with each other, between the restriction wall portion 10b of the knock member 8 and the rear end of the shaft cylinder 2. A gap in the axial direction is formed so that the knock member 8 can be pushed forward, and the convex portion of the front cam portion 93 of the knock member 8 and the concave portion of the rear cam portion 71 of the cam member 5 are engaged. In the state, or the recess of the front cam portion 93 of the knock member 8 and the cover When the convex portion of the rear cam portion 71 of the drum member 5 is in the engaged state, the restriction wall portion 10b of the knock member 8 and the rear end of the shaft cylinder 2 are brought into contact with each other, and the knock member 8 moves forward. It is necessary to be blocked.

The thermochromic writing instrument 1 according to the first invention can reliably prevent the frictional portion from moving in the front-rear direction when the frictional operation is performed using the frictional portion.

The thermochromic writing instrument 1 according to the second invention of the present application is the thermochromic writing instrument 1 according to the first invention, wherein the knock member 8 includes a front member 9 including a front cam portion 93 at a front end, and the front member 9. The rear member 10 is fixed to the rear end portion of the member 9 and includes the restriction wall portion 10b. The rear member 10 is made of an elastic material, and the friction portion 10c is formed on the outer surface of the rear end portion of the rear member 10. It is necessary to be done.

In the thermochromic writing instrument 1 according to the second invention, the knock member 8 is constituted by the front member 9 including the front cam portion 93 and the rear member 10 including the friction portion 10c. A stable contact state with the cam portion 71 is obtained, and as a result, a stable pressing operation of the knock member 8 becomes possible.

The thermochromic writing instrument of the present invention can reliably prevent the frictional portion from moving in the front-rear direction when the frictional operation is performed using the frictional portion.

It is a longitudinal cross-sectional view which shows the press operation state to the front of the knock member of embodiment of this invention. It is a principal part expanded longitudinal cross-sectional view of FIG. It is a longitudinal cross-sectional view which shows the state by which the movement to the front of the knock member of FIG. 1 was blocked | prevented. FIG. 4 is an enlarged vertical cross-sectional view of a main part of FIG. 3. It is an exploded view which shows the intrusion mechanism of FIG. It is an expanded view which shows the contact state of the convex part of the front cam part of FIG. 1, and the convex part of a back cam part. It is an expanded view which shows the engagement state of the convex part of the front cam part of FIG. 1, and the recessed part of a back cam part. It is a principal part perspective view which shows the contact state of the convex part of the front cam part of FIG. 1, and the convex part of a back cam part. It is a principal part perspective view which shows the engagement state of the convex part of the front cam part of FIG. 1, and the recessed part of a back cam part.

Embodiments of the writing instrument of the present invention will be described with reference to the drawings. (See FIGS. 1 to 6)

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. A front end hole 21 is formed at the front end of the front shaft 2a. A grip portion made of an elastic material is formed on the side surface of the front shaft 2a. A clip 23 extending in the front-rear direction is integrally provided on the side wall of the rear shaft 2b. In the present embodiment, an annular member 2c is fixed to the rear end of the rear shaft 2b, and the rear end hole 22 is configured by the annular member 2c.

The cursive body 3 includes a pen tip 31, an ink storage tube 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, and a back of the thermochromic ink. It consists of a follower (for example, a high-viscosity fluid) that fills the ends 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 provided with a vent hole through which the ink containing tube and the outside can be vented may be attached to the rear end opening of the ink containing tube.

The retracting mechanism is a knock-type retracting mechanism that uses a rotating cam mechanism, and is formed on the inner surface of the shaft cylinder 2 and is alternately arranged along the circumferential direction and extends in the front-rear direction and a plurality of cam teeth 24 and cam grooves 25. And a plurality of ridges 41 which are in contact with the rear end of the writing body 3 and are rotatably arranged with respect to the shaft cylinder 2 and can be alternately engaged with the cam teeth 24 or the cam grooves 25. The rotating member 4 has a plurality of cam projections 61 disposed behind the rotating member 4 so as not to rotate with respect to the shaft tube 2 and movable in the front-rear direction, and rotates the rotating member 4 and the shaft. A cam member 5 (a front side member 6 and a rear side member 7) having a plurality of engaging projections 62 that are engaged with the cam groove 25 on the inner surface of the cylinder 2 so as to be movable back and forth, and a knock member that presses the cam member 5 forward. 8 and a projectile 11 for biasing the cursive body 3 backward For example consisting compression coil spring) and. The retracting mechanism is a double knock type in which both the pen tip protruding operation and the pen tip retracting operation press the knock body forward.

The rotating member rotating member 4 includes three protrusions 41 extending in the longitudinal direction on the outer surface, and the protrusions 41 are engaged with the cam grooves 25. The rotating member 4 is a cylindrical synthetic resin molded body. The rear end of the writing body 3 is always in contact with the inner wall of the rotating member 4.

The cam member cam member 5 includes a cylindrical front member 6 and a rear member 7 fixed to the inner surface of the front member 6. The cam member 5 is a cylindrical synthetic resin molded body. An engagement protrusion 62 that slides in the cam groove 25 and a cam protrusion 61 that engages with the rear end of the protrusion 41 of the rotating member 4 are provided at the front end portion of the front member 6. A rear cam portion 71 including a single convex portion and a single concave portion is provided at the rear end of the rear member 7. The rear cam portion 71 provided at the rear end of the rear member 7 is composed of a single convex portion and a single concave portion facing rearward. At the top of the convex portion of the rear cam portion 71, a recess portion 71 a is formed on which the convex portion of the front cam portion 93 can get over and engage.

The knock member knock member 8 includes a front member 9 and a rear member 10 fixed to the rear end portion of the front member 9.

The front member front member 9 includes a large-diameter portion 91 and a small-diameter portion 92 integrally connected to the rear of the large-diameter portion 91, and is obtained from a synthetic resin molded body. A front cam portion 93 is formed at the front end of the front member 9. A locking step 94 is formed on the outer surface of the large-diameter portion 91 of the front member 9, and the front end of the knock member bullet 12 is locked to the locking step 94. The outer surface of the small diameter portion 92 of the front member 9 is fixed to the inner surface of the mounting hole 10 a of the rear member 10. The front cam portion 93 provided at the front end of the front member 9 includes a single convex portion and a single concave portion facing in the front direction.

-Rear member The rear member 10 is formed in a bottomed cylindrical shape that is open at the front and closed at the rear, and is integrally formed of an elastic material (for example, silicone resin, SBS resin, SEBS resin, or the like). A restriction wall portion 10 b is formed on the outer surface of the rear member 10. The outer diameter of the restriction wall portion 10b is set larger than the inner diameter of the rear end hole 22 of the shaft tube 2. The restriction wall portion 10 b can contact the opening end of the rear end hole 22 of the shaft tube 2. The outer surface of the rear end portion of the rear member 10 is formed in a convex curved shape, and thereby, the friction portion 10c having a convex curved surface is formed on the outer surface of the rear end portion of the rear member 10.

The knock member bullet member knock member 8 is urged forward by a knock member bullet member 12 (for example, a compression coil spring). The resilience of the knock member bullet 12 is set smaller than the resilience of the bullet 11 that biases the writing body 3 backward. The front end of the knock member elastic body 12 is locked to the locking wall portion 94 of the knock member 8, and the rear end of the knock member elastic body 12 is the inner wall (annular member 2c) of the rear end portion of the shaft tube 2. To the inner wall). Since the knock member 8 is urged forward by the knock member elastic body 12, the front cam portion 93 and the rear cam portion 71 are always kept in contact with each other.

FIG. 2, FIG. 6 and FIG. 8 show a state in which the knock member 8 can be pushed forward. In this state, the convex portion of the front cam portion 93 and the convex portion of the rear cam portion 71 are brought into contact with each other, and the convex portion of the front cam portion 93 is engaged with the concave portion 71 a of the convex portion top portion of the rear cam portion 71. Yes. This state is obtained by half-rotating the knock member 8 with respect to the shaft tube 2 from the states of FIGS. 4, 7 and 9.

4, 7, and 9 show a state in which the pushing operation of the knock member 8 forward is prevented. This state is obtained by half-rotating the knock member 8 with respect to the shaft tube 2 from the states of FIGS. 2, 6 and 8. In this state, the convex portion of the front cam portion 93 and the concave portion of the rear cam portion 71 are engaged, or the concave portion of the front cam portion 93 and the convex portion of the rear cam portion 71 are engaged. In this state, the restriction wall portion 10b of the knock member 8 and the rear end of the shaft cylinder 2 are in contact with each other. This prevents the knock member 8 from moving forward.

The thermochromic writing instrument 1 of the present embodiment accommodates thermochromic ink in the cursive body 3, and a pen tip 31 capable of discharging the thermochromic ink is provided at the front end of the cursive body 3. The body 3 is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, a knock member 8 is provided at the rear end portion of the shaft cylinder 2, and the pen tip 31 is pushed forward by pressing the knock member 8 forward. The pen tip protruding state is released by pressing the knock member 8 forward again, and the pen tip 31 is immersed in the shaft tube 2 from the front end hole 21 of the shaft tube 2. A friction portion 10c that rubs the handwriting of the thermochromic ink on the outer surface of the rear end portion of the knock member 8 and that can thermally discolor the handwriting of the thermochromic ink by frictional heat generated at that time. A thermochromic writing instrument provided, wherein the protruding and retracting mechanism includes the shaft tube 2 A plurality of cam teeth 24 and cam grooves 25 formed in the surface and extending in the front-rear direction alternately arranged along the circumferential direction, and disposed behind the writing body 3 so as to be rotatable with respect to the shaft cylinder 2. The rotating member 4 having a plurality of protrusions 41 that can alternately engage with the cam teeth 24 or the cam grooves 25, and behind the rotating member 4, cannot rotate with respect to the shaft cylinder 2 and in the front-rear direction. A cam member that has a plurality of cam projections 61 that are arranged so as to be movable and that rotate the rotating member 4 and that are engaged with the cam grooves 25 on the inner surface of the shaft cylinder 2 so as to be movable back and forth. 5, a knock member 8 that presses the cam member 5 forward, and a resilient body 11 that urges the writing body 3 backward, and at the front end of the knock member 8 from a convex portion and a concave portion. The front cam portion 93 is provided, and the rear end of the cam member 5 A rear cam portion 71 having a convex portion and a concave portion engageable with the front cam portion 93 of the knock member 8 is provided, and the knock member 8 is configured to be rotatable with respect to the shaft cylinder 2. 8 protrudes rearward from the rear end hole 22 of the shaft cylinder 2, and a regulating wall portion 10 b that can contact the rear end of the shaft cylinder 2 is formed on the outer surface of the knock member 8, and the knock member 8 and the front cam When the convex portion of the portion 93 and the convex portion of the rear cam portion 71 of the cam member 5 are in contact with each other, a gap in the axial direction is formed between the restriction wall portion 10b of the knock member 8 and the rear end of the shaft cylinder 2. When the knock member 8 is pushed forward, the convex portion of the front cam portion 93 of the knock member 8 and the concave portion of the rear cam portion 71 of the cam member 5 are in an engaged state. Or a recess in the front cam portion 93 of the knock member 8 and the cam member 5. When the convex portion of the rear cam portion 71 is in the engaged state, the restriction wall portion 10b of the knock member 8 and the rear end of the shaft cylinder 2 are brought into contact with each other, and the forward movement of the knock member 8 is prevented. .

The thermochromic writing instrument 1 of the present embodiment can reliably prevent the frictional part 10c from moving in the front-rear direction when the frictional operation is performed using the frictional part 10c.

Further, in the thermochromic writing instrument 1 of the present embodiment, the knock member 8 is fixed to a front member 9 having a front cam portion 93 at a front end and a rear end portion of the front member 9, and the restriction wall portion 10b. The rear member 10 is made of an elastic material, and a friction portion 10c is formed on the outer surface of the rear end portion of the rear member 10. In the thermochromic writing instrument 1 of the present embodiment, the front cam portion 93 and the rear cam portion are configured by configuring the knock member 8 from the front member 9 including the front cam portion 93 and the rear member 10 including the friction portion 10c. As a result, a stable pressing operation of the knocking member 8 becomes possible.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Front end hole 22 Rear end hole 23 Clip 24 Cam tooth 25 Cam groove 2a Front shaft 2b Rear shaft 2c Annular member 3 Writing body 31 Pen tip 4 Rotating member 41 Projection 5 Cam member 6 Front member 61 Cam projection 62 Engagement projection 7 Rear side member 71 Rear cam portion 71a Depression portion 8 Knock member 9 Front member 91 Large diameter portion 92 Small diameter portion 93 Front cam portion 94 Locking step portion 10 Rear member 10a Mounting hole 10b Restriction wall portion 10c Friction part 11 Bullet 12 Bullet for knock member

Claims (2)

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 member is provided at a rear end portion of the shaft cylinder, the pen tip is made to protrude from the front end hole of the shaft cylinder by pressing the knock member forward, and the pen member is again pressed forward by pressing the knock member forward. 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 member. A thermochromic writing instrument provided with a friction part capable of thermally discoloring the handwriting of the thermochromic ink with frictional heat generated in
The protruding and retracting mechanism is formed on the inner surface of the shaft cylinder, and is rotated with respect to the shaft cylinder behind the writing body, and a plurality of cam teeth and cam grooves extending in the front-rear direction alternately arranged along the circumferential direction. A rotating member having a plurality of protrusions that can be alternately engaged with the cam teeth or the cam groove, and is not rotatable relative to the shaft cylinder and movable in the front-rear direction behind the rotating member. And a cam member having a plurality of cam projections for rotating the rotation member and having a plurality of engagement projections engaged with a cam groove on the inner surface of the shaft cylinder so as to move back and forth. A knock member that presses against the projectile, and a projectile that urges the writing body backward,
A front cam portion comprising a convex portion and a concave portion is provided at the front end of the knock member, and a rear cam portion comprising a convex portion and a concave portion that can be engaged with the front cam portion of the knock member at the rear end of the cam member. The knock member is configured to be rotatable with respect to the shaft tube, the knock member protrudes rearward from the rear end hole of the shaft tube, and contacts the rear end of the shaft tube against the outer surface of the knock member. A contact wall that can be contacted is formed,
When the convex portion of the front cam portion of the knock member and the convex portion of the rear cam portion of the cam member are in contact with each other, an axial gap is provided between the restriction wall portion of the knock member and the rear end of the shaft cylinder. Is formed, and it is possible to push the knock member forward.
When the convex portion of the front cam portion of the knock member and the concave portion of the rear cam portion of the cam member are in an engaged state, or the concave portion of the front cam portion of the knock member and the convex portion of the rear cam portion of the cam member The thermochromic writing instrument is characterized in that the regulating wall portion of the knock member and the rear end of the shaft tube are brought into contact with each other when the knock member is in an engaged state, and forward movement of the knock member is prevented. The knock member includes a front member having a front cam portion at a front end, a rear member fixed to a rear end portion of the front member and having the restriction wall portion, and the rear member is made of an elastic material, The thermochromic writing instrument according to claim 1, wherein a friction portion is formed on the outer surface of the rear end portion of the rear member.

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