JP2019147396A - Thermochromic writing instrument - Google Patents

Abstract

To provide a thermochromic writing instrument that can achieve a stable rubbing operation by using a rubbing part, prevent the rubbing part from being soiled due to finger marks or the like, and increase degree of freedom of appearance design.SOLUTION: A thermochromic writing instrument 1 is configured so that a writing body 9 storing thermochromic ink in the writing body is housed in a barrel 2, the writing body 9 is moved in a forward/backward direction by operating an operation body provided on the barrel 2, and a pen tip 91 of the writing body 9 is allowed to come out from and come into a front end of the writing instrument. The thermochromic writing instrument comprises: a rubbing part 10 that rubs against handwriting of the thermochromic ink and thermally discolors the handwriting by frictional heat caused by rubbing; and a clip body 7 serving as at least one operation body. The rubbing part 10 is arranged at a rear end of the barrel 2. The clip body 7 is arranged at a portion of the barrel 2 other than the rear end.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a thermochromic writing instrument. Specifically, thermochromic ink is accommodated in the cursive body, a pen tip capable of discharging the thermochromic ink is provided at the front end of the cursive body, and the cursive body can be moved in the front-rear direction in the shaft cylinder. And a thermochromic writing instrument in which the pen tip of the writing body is configured to be able to protrude and retract from a front end hole of a shaft cylinder.

  In Patent Document 1, a writing body is accommodated in a shaft cylinder so as to be movable in the front-rear direction, an operation portion is provided on an outer surface of the shaft tube, and the pen tip of the writing body is attached to the shaft tube by operating the operation portion. It is configured to be able to appear and retract from a front end hole, accommodates thermochromic ink inside the cursive body, provides a pen tip capable of ejecting the thermochromic ink at the front end of the cursive body, on the outer surface of the shaft cylinder, There has been disclosed a thermochromic writing instrument provided with a friction portion capable of thermally changing the handwriting with frictional heat generated by rubbing the handwriting of the thermochromic ink.

  In Patent Document 1, when a friction part is provided in the operation part in the type in which the operation part at the rear end of the shaft cylinder is pressed forward, the operation part moves forward by the writing surface when a friction operation is performed using the friction part. However, there is a possibility that a stable friction operation cannot be performed. In particular, when both a pen tip protruding operation and a pen tip immersing operation employ a retracting mechanism (so-called double knock type) that pushes the operating portion forward and a friction portion is provided in the operating portion, the pen tip protrudes. In this state, the operating body may rattle in the front-rear direction, and a stable friction operation may not be performed.

  Further, in FIG. 12 of Patent Document 1, a cylindrical operation portion is provided so as to be movable in the front-rear direction, and a clip that can be sandwiched in a pocket or the like is provided on the outer surface of the cylindrical operation portion. The structure which provided the friction part in the rear-end outer surface of the operation part is disclosed. However, since the thermochromic writing instrument having this configuration presses the friction portion during the pen tip operation, the friction portion may be soiled with dirt or the like. When the handwriting of the thermochromic ink is rubbed in a state where the friction portion is dirty, the writing surface (for example, paper surface) having the handwriting may be stained.

  Further, in FIG. 15 of Patent Document 1, the operation portion is protruded radially outward from the side wall of the shaft cylinder, and the operation portion is pushed forward against the rear bias, thereby removing the pen tip from the immersive state. A configuration is disclosed in which a pen tip protruding state (so-called multi-core type side slide type) protruding and retracting mechanism is provided, and a friction portion is provided on the outer surface of the rear end of the shaft cylinder. However, the thermochromic writing instrument with this configuration must operate an operating tool attached to another writing tool when the pen tip protrudes from the pen tip protruding state (when the pen tip protruding state is canceled). . Therefore, it is necessary to provide a plurality of operating bodies (that is, a plurality of protruding portions), and the degree of freedom in appearance design is reduced. Furthermore, when a clip that can be held in a pocket or the like is provided on the shaft tube, the protruding portion is further increased, and the degree of freedom in appearance design is reduced.

International Publication No. 2008/105227 Pamphlet

  The present invention solves the above-mentioned conventional problems, enables a stable friction operation using the friction part, and further prevents the friction part from being soiled with hand dirt, etc. It is intended to provide a thermochromic writing instrument of increasing degree.

In addition to the above, an object of the present invention is to provide a thermochromic writing instrument having the following effects.
(1) The user can easily learn the operation method, and the operation method is simple.
(2) The clip body can be easily inserted into the slide hole.
(3) It can avoid that the whole axial cylinder becomes unnecessarily long.
(4) Even when the vicinity of the clip body is gripped with the pen tip protruding, a stable friction operation is possible.
(5) The clamping performance of the clip body can be improved and the clip body can be prevented from wobbling.
(6) When changing from the pen tip protruding state to the pen tip immersing state, the impact applied to the cursive body can be reduced.

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

  In order to achieve the above-mentioned object, the thermochromic writing instrument of the present invention comprises a writing body containing thermochromic ink therein and accommodates the writing body by operating an operating body provided on the shaft cylinder. A thermochromic writing instrument configured to move the body in the front-rear direction and to allow the pen tip of the writing body to protrude and retract from the tip of the writing instrument, and the frictional heat generated by rubbing the handwriting of the thermochromic ink A friction part capable of thermally discoloring a handwriting; and at least one clip body as the operation body, wherein the friction part is provided at a rear end of the shaft tube, and the clip is provided at a portion other than the rear end of the shaft tube. The structure is provided with a body.

  According to the above configuration, since the friction part is provided at the rear end of the shaft cylinder independently of the clip body (operation body), the friction part does not move backward during the friction operation, and the friction part is used. The friction operation that has been performed becomes stable. Further, since it is not necessary to touch the friction portion when performing the pen tip operation, it is possible to avoid the friction portion from being soiled with hand dirt or the like.

  Preferably, in the above-described thermochromic writing instrument of the present invention, the operating body is provided with only the single clip body, and the single nib of the writing body is protruded by operating the single clip body. A structure that can be immersed is adopted.

  According to the above configuration, the pen tip operation can be performed with a single clip body, and there is no need to provide a plurality of operation bodies (that is, a plurality of protruding portions) on the shaft cylinder. Furthermore, since the clip body that is an operation body also serves as a clip that can be sandwiched in a pocket or the like, the appearance can be eliminated as the operation body, increasing the degree of freedom in the design of the thermochromic writing instrument, A smart appearance can be obtained.

  In the thermochromic writing instrument of the present invention described above, the shaft cylinder may be composed of a plurality of parts that can be connected to each other. In this case, a portion including the rear end of the shaft cylinder is a rear shaft as the part. It is good also as a structure which provided the said friction part in the rear-end part of the said rear axis | shaft. That is, the shaft cylinder constituting the thermochromic writing instrument may be a single cylindrical body, or may be a single cylindrical body by connecting a plurality of components to each other.

  Preferably, in the above-described thermochromic writing instrument of the present invention, a slide hole extending in the front-rear direction is provided on a side wall of the shaft cylinder, and the clip body disposed in the slide hole is slid forward to perform the writing. It is set as the structure provided with the intrusion mechanism which makes the pen point of a body the protrusion state from an immersion state.

  According to the above configuration, by sliding the clip body forward, the pen tip can be brought into a protruding state and an immersive state (so-called double knock type retracting mechanism), the operation method is simple, and the user can operate You can learn the method easily.

  Preferably, in the above-described thermochromic writing instrument of the present invention, the shaft cylinder is composed of two or more parts that can be connected to each other, and a front end or a rear end is provided on each side wall of the two parts constituting the shaft cylinder. A first or second elongated hole that is open and extends in the front-rear direction is provided, and when the two parts are connected, the first and second elongated holes communicate with each other to form the slide hole. The configuration.

  According to the above configuration, for example, when the slide hole is formed by the first long hole opened to the rear and the second long hole opened to the front, the two parts constituting the shaft cylinder are connected. The clip body and the shaft tube can be easily inserted into the slide hole through the open ends of the first and second elongated holes when the slide body is formed (ie, when the slide hole is formed). Can be assembled efficiently.

  Preferably, in the above-described thermochromic writing instrument of the present invention, the side walls of the two parts constituting the shaft cylinder are connected so as to overlap each other in the radial direction, and the first and second elongated holes are The slide holes are formed so as to communicate with each other in a state of overlapping each other in the radial direction.

  According to the said structure, it can avoid that the whole axial cylinder becomes unnecessarily long by making the 1st and 2nd long hole communicate in the state which mutually overlapped in radial direction. That is, the overlapping portion of the first and second long holes does not affect the entire length of the slide hole. The configuration of “overlapping in the radial direction” will be described in detail later with a specific example.

  More preferably, in the thermochromic writing instrument of the present invention described above, a step of inserting a base portion of the clip body into the first long hole provided in one of the parts constituting the shaft tube, and the shaft tube The base part of the clip body is inserted into the second long hole provided in the other part constituting, and the other part is connected to the one part, and the second long hole is connected to the first long hole. And a step of forming the slide hole by communicating with a long hole, and the clip body is assembled to the slide hole.

  According to the above configuration, in addition to being able to easily insert the clip body into the slide hole, the base of the clip body inserted into the first long hole is used as a guide, and the first and second long holes are aligned. It is possible to easily connect the other part to another part.

  Preferably, in the above-described thermochromic writing instrument according to the present invention, a cam mechanism serving as the retracting mechanism is provided in the shaft cylinder, and the cam mechanism includes cam portions that can be alternately engaged at different positions in the front-rear direction. By sliding the clip body forward, including the protrusions, the cam portions and the protrusions are alternately engaged at different positions in the front-rear direction, and the pen tip of the writing body is alternately protruded or immersed. The configuration is as follows.

  More preferably, a plurality of cam teeth and cam grooves extending in the front-rear direction alternately arranged along the circumferential direction, and the cam teeth or A rotating member having a plurality of protrusions that can alternately engage with the cam groove, a plurality of other cam teeth provided on the clip body, and for rotating the rotating member, and urging the writing body backward. The projecting body is provided in the shaft tube, and the clip body is slid forward to resist the biasing force of the projecting body, whereby the protrusions are alternately formed in the cam teeth or the cam grooves. It is good also as a structure which makes the pen point of the said writing body make a protruding state or an immersion state alternately.

  According to such a configuration, it is possible to configure a double-knock type in / out mechanism that can make the pen tip project and immerse simply by sliding the clip body forward using the cam mechanism. The operation method of the thermochromic writing instrument becomes extremely simple, and the user can easily learn the operation method.

  Preferably, in the above-described mechanism for extending and retracting the thermochromic writing instrument, the clip body has a shaft portion that is accommodated in the shaft tube and extends in the front-rear direction, and the shaft portion and the rotating member are in the front-rear direction. It is set as the structure which mutually latches in the state which has no play.

  According to such a configuration, the shaft portion of the clip body and the rotating member are locked in a state of having a play in the front-rear direction, so that the protruding state of the pen tip (that is, the cam teeth and the protrusions are forward). ), The clip body that has moved to the front of the slide hole is prevented from moving backward. As a result, when the friction operation is performed with the pen tip protruding, even if the vicinity of the clip body is gripped, the clip body does not move carelessly, and a stable friction operation is possible.

  Preferably, in the above-described mechanism for extending and retracting the thermochromic writing instrument, a guide groove extending in the front-rear direction is formed on the outer surface of the shaft cylinder in front of the slide hole, and a ball portion projects on the inner surface of the front portion of the clip body. And the ball portion slides in the guide groove in the front-rear direction as the clip body moves in the front-rear direction.

  According to the above configuration, when the clip body is slid, the ball portion slides along the guide groove to guide the clip body in the front-rear direction, thereby preventing the clip body from wobbling in the lateral direction (circumferential direction). can do. Further, when the object to be clamped such as a pocket of clothes or a notebook is sandwiched between the clip body, the object to be clamped is sandwiched between the ball part and the guide groove, so that the clamping performance of the clip body is improved.

  Preferably, in the above-described mechanism for extending and retracting the thermochromic writing instrument, the friction part is made of an elastic material, and a part of the friction part is in contact with a clip body in a pen tip immersion state.

  According to the above configuration, when the pen tip is changed from the protruding state to the pen tip immersive state, the clip body moved to the rear of the slide groove comes into contact with the friction portion made of an elastic material. Can be relaxed. As a result, it is possible to prevent backflow of ink in the writing body and air contamination from the pen tip.

  In the appearance mechanism of the thermochromic writing instrument described above, the friction portion is made of an elastic material, and is press-fitted, engaged, screwed, fitted, and bonded to the rear end of the shaft cylinder or the rear end of the rear shaft. It is fixed by color molding, or the entire shaft cylinder or the entire rear shaft is formed of an elastic material as the friction portion.

  According to the above configuration, the friction part can be sufficiently firmly fixed to the rear end of the shaft tube, and the friction part is used without causing the friction part to move backward or drop off during the friction operation. The friction operation becomes stable.

  Hereinafter, more specific embodiments <1> to <7> of the present invention described above will be described with reference to the reference numerals in FIGS.

<1> The thermochromic writing instrument 1 according to the first embodiment contains a thermochromic ink in the cursive body 9 and can eject the thermochromic ink to the front end of the cursive body 9. 91 is provided, and the writing body 9 is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction while being urged rearward, and the pen point 91 of the writing body 9 can protrude and retract from the front end hole 31 of the shaft cylinder 2. In the thermochromic writing instrument configured as described above, a slide hole 21 extending in the front-rear direction is provided in the side wall of the shaft tube 2, and the clip body 7 is protruded radially outward from the slide hole 21, so that the clip body 7 is The pen tip 91 is configured to be movable in the front-rear direction along the slide hole 21, and the pen tip 91 is projected from the front end hole 31 of the shaft tube 2 by sliding the clip body 7 forward from the pen tip immersion state. By operating the clip body 7 from the protruding state A rubbing mechanism 10 that includes a retracting mechanism that brings the nib 91 into an immersive state, and rubs the handwriting of the thermochromic ink at the rear end of the shaft cylinder 2 and is capable of thermally discoloring the handwriting with frictional heat generated at that time. It has a configuration provided.

  In the thermochromic writing instrument 1 according to the first embodiment, since the friction part 10 is provided at the rear end of the shaft cylinder 2, the rearward movement of the friction part 10 is prevented during the friction operation. Thus, a stable friction operation can be performed using the friction portion 10. Further, the thermochromic writing instrument 1 according to the first embodiment is provided with an operation part for operating the pen tip in the clip body 7 and the friction part 10 is made independent of the clip body 7 (operation part). As a result, when the pen tip 91 appears and disappears, the clip body 7 is operated, and the friction portion 10 is not operated. Further, the thermochromic writing instrument 1 according to the first embodiment is compared with the conventional multi-core type side slide type thermochromic writing instrument although the clip body 7 is provided on the outer surface of the shaft tube 2. There are few protruding parts, the degree of freedom in appearance design is increased, and a smart appearance can be obtained.

  In addition, in this invention, the said clip body 7 can be pinched | interposed into to-be-clamped objects, such as a pocket and a notebook of clothes, between the axial cylinders 2 outer surface. In the present invention, the friction portion 10 may be configured to fix the friction portion 10 to the rear end of the shaft tube 2 at least during a friction operation. For example, the friction portion 10 may be other than the pen tip operation. The structure which protrudes and protrudes from the rear end of the axial cylinder 2 by operation may be sufficient. In the present invention, operating the clip body 7 from the pen tip protruding state is an operation for releasing the pen tip protruding state. For example, the clip body 7 is slid forward and the clip body 7 is moved in the radial direction. For example, a pressing operation or a rotation operation of the clip body 7 may be used. In the present invention, the time of friction operation means the time of friction operation using the friction portion 10. At the time of the friction operation, either the pen tip protruding state or the pen tip immersing state may be used.

<2> The thermochromic writing instrument 1 according to the second embodiment is the writing instrument 1 according to the first invention, wherein the projecting mechanism is a side slide type projecting mechanism using a rotating cam mechanism. The cam part 41 formed on the inner surface, the rotating member 6 that engages with the cam part 41 and contacts the rear end of the writing body 9, and the cam teeth 73 a and 74 a that engage with the rotating member 6. The clip body 7 and the projectile body 8 accommodated in the shaft cylinder 2 and biases the writing body 9 backward. Both the pen tip protruding operation and the pen tip immersing operation move the clip body 7 forward. It has a configuration that is a type to perform a slide operation.

  In the thermochromic writing instrument 1 according to the second embodiment, the intrusion mechanism is a side slide type intrusion mechanism using a rotating cam mechanism, and both the pen tip protrusion operation and the pen tip immersion operation are clip bodies 7. Is a type that slides forward (so-called double knock type in / out mechanism), so the operation method is simple and the user can easily learn the operation method.

<3> The thermochromic writing instrument 1 according to the third embodiment is the thermochromic writing instrument 1 according to the first or second invention, wherein the shaft cylinder 2 includes the front shaft 3 and the front shaft 3. The intermediate shaft 4 connected to the rear end portion and the rear shaft 5 connected to the rear end portion of the intermediate shaft 4 are provided with a front end hole 31 into which the pen tip 91 can protrude and retract at the front end of the front shaft 3. A cam portion 41 is provided on the inner surface of the intermediate shaft 4, a first elongated hole 44 opened rearward and extending in the front-rear direction is provided at a rear end portion of the intermediate shaft 4, and a front end portion of the rear shaft 5 is provided at the front end portion. A second long hole 51 opened forward and extending in the front-rear direction is provided, and the rear end portion of the intermediate shaft 4 and the front end portion of the rear shaft 5 are connected to the first long hole 44 and the second long hole 51. And the first elongated hole 44 and the second elongated hole 51 form the slide hole 21 on the side wall of the shaft cylinder 2, and the rear end of the rear shaft 5. It has a fixed configuration in which the friction portion 10 to the surface.

  In the thermochromic writing instrument 1 according to the third embodiment, the slide hole 21 is formed by the first long hole 44 opened to the rear and the second long hole 51 opened to the front. When connecting the intermediate shaft 4 and the rear shaft 5 (that is, when forming the slide hole 21), the clip body 7 can be inserted into the first long hole 44 and the second long hole 51, and the clip body 7 can be easily inserted into the slide hole 21, and the clip body 7 and the shaft tube 2 can be easily inserted and assembled.

<4> The thermochromic writing instrument 1 according to the fourth embodiment is the thermochromic writing instrument 1 according to the third invention, wherein the side wall of the intermediate shaft 4 and the side wall of the rear shaft 5 are arranged in the radial direction. The first elongated hole 44 and the second elongated hole 51 are connected in the radial direction so as to overlap each other.

  The thermochromic writing instrument 1 according to the fourth embodiment connects the side wall of the intermediate shaft 4 and the side wall of the rear shaft 5 so as to overlap each other in the radial direction, and the first elongated hole 44 and the By connecting the second long hole 51 in the radial direction, the entire shaft tube 2 can be prevented from becoming unnecessarily long. In the present invention, to connect the side wall of the intermediate shaft 4 and the side wall of the rear shaft 5 so as to overlap each other in the radial direction, for example, the outer surface of the side wall of the intermediate shaft 4 and the inner surface of the side wall of the rear shaft 5 are connected. A structure for coupling (for example, fitting or screwing) so as to overlap in the direction, or a connection (for example, fitting or screwing) so that the inner wall of the intermediate shaft 4 and the outer wall of the rear shaft 5 overlap in the radial direction. A configuration is mentioned. The configuration in which the side wall of the intermediate shaft 4 and the side wall of the rear shaft 5 are connected so as to overlap each other in the radial direction is such that at least a part of the side wall of the intermediate shaft 4 and a part of the side wall of the rear shaft 5 What is necessary is just the structure connected so that it may mutually overlap in a radial direction.

<5> The thermochromic writing instrument 1 according to the fifth embodiment is the thermochromic writing instrument 1 according to the second, third, or fourth invention, wherein the clip body 7 is accommodated in the shaft tube 2. The shaft portion 73 extends in the front-rear direction, and the shaft portion 73 and the rotating member 6 are configured to be locked in the front-rear direction in a state where they can rotate with each other and have play in the front-rear direction. Yes.

  In the thermochromic writing instrument 1 according to the fifth embodiment, the clip body 7 has a shaft portion 73 that is accommodated in the shaft tube 2 and extends in the front-rear direction, and the shaft portion 73 and the rotating member. 6 are locked in the front-rear direction in a state where they can rotate with each other and have play in the front-rear direction, so that the rotating member 6 is locked to the cam teeth 41a of the cam portion 41 in the pen tip protruding state, The backward movement of the rotating member 6 is prevented, and inadvertent movement of the clip body 7 in the front-rear direction is suppressed. As a result, even if the vicinity of the clip body 7 is gripped with the pen tip protruding, a stable friction operation can be performed.

<6> The thermochromic writing instrument 1 according to the sixth embodiment is the thermochromic writing instrument 1 according to any one of the first to fifth inventions, and the outer surface of the shaft cylinder 2 in front of the slide hole 21. A guide groove 48 extending in the front-rear direction is formed, and a ball portion 71 a is projected on the inner surface of the front portion of the clip body 7, and the ball in the guide groove 48 is moved along with the movement of the clip body 7 in the front-rear direction. The part 71a is configured to slide in the front-rear direction.

  In the thermochromic writing instrument 1 according to the sixth embodiment, a guide groove 48 extending in the front-rear direction is formed on the outer surface of the shaft cylinder 2 in front of the slide hole 21, and the front inner surface of the clip body 7 is formed. And the ball 71a slides in the front-rear direction in the guide groove 48 as the clip body 7 moves in the front-rear direction, thereby improving the clip body clamping performance. The wobbling of the clip body 7 in the lateral direction (circumferential direction) can be prevented.

<7> The thermochromic writing instrument 1 according to a seventh embodiment is the thermochromic writing instrument 1 according to any one of the first to sixth inventions, wherein the friction part 10 is made of an elastic material, and the friction part 10 is configured to be in contact with the clip body 7 in the pen tip immersion state.

In the thermochromic writing instrument 1 according to the seventh embodiment, the friction part 10 is made of an elastic material, and a part of the friction part 10 is in contact with the clip body 7 in a pen tip immersive state. When the pen tip protruding state is changed to the pen tip immersive state, the writing body 9 and the clip body 7 are moved rearward by the rear urging of the elastic body 8, and the clip body 7 and the friction portion 10 made of an elastic material come into contact with each other. In this case, the impact applied to the cursive body 9 can be reduced. As a result, it is possible to prevent backflow of ink in the writing body 9 and air from the nib 91.

  The thermochromic writing instrument of the present invention enables a stable friction operation using the friction part, and further prevents the friction part from being soiled with dirt, etc., and further increases the degree of freedom in appearance design and is smart. Appearance can be obtained.

It is a side view which shows the nib immersion state of the 1st Embodiment of this invention. It is a front view of FIG. It is a side view which shows the pen tip protrusion state of FIG. It is a longitudinal cross-sectional view of FIG. FIG. 2 is an enlarged longitudinal sectional view of a front shaft in FIG. 1. FIG. 2 is an enlarged longitudinal sectional view of an intermediate shaft in FIG. 1 and an enlarged side view of a rotating member. FIG. 2 is an enlarged longitudinal sectional view of a rear shaft of FIG. 1 and an enlarged side view of a friction portion. It is an enlarged side view of the clip body of FIG. It is an expanded longitudinal cross-sectional view which shows other embodiment of the clip body of this invention. It is explanatory drawing which shows the color change behavior of a thermochromic ink. It is a side view which shows the pen tip immersion state of the 2nd Embodiment of this invention. It is a front view of FIG. It is a side view which shows the pen tip protrusion state of FIG. It is a longitudinal cross-sectional view of FIG. It is an AA line expanded sectional view of FIG. It is the BB line expanded sectional view of FIG. It is a longitudinal cross-sectional view of the pen tip protruding state of FIG. FIG. 12 is an enlarged longitudinal sectional view of the front shaft of FIG. 11. It is an enlarged front view of the intermediate shaft of FIG. 19A is a cross-sectional view taken along line CC in FIG. 19, FIG. 19B is a cross-sectional view taken along line DD in FIG. 19, FIG. 19C is a cross-sectional view taken along line EE in FIG. FIG. FIG. 12 is an enlarged longitudinal sectional view of the intermediate shaft in FIG. 11. FIG. 12 is an enlarged front view of the rear shaft of FIG. 11. It is the GG sectional view taken on the line of FIG. FIG. 12 is an enlarged longitudinal sectional view of the rear shaft of FIG. 11. FIG. 12 is an enlarged longitudinal sectional view showing a state where the rear shaft and the friction portion are attached to FIG. 11. It is a principal part enlarged front view which abbreviate | omitted the clip body of FIG. It is an expansion longitudinal cross-sectional view of the clip body of FIG. It is an enlarged side view of the clip body principal part except the cylindrical body of the clip body of FIG. It is an enlarged front view of the cylindrical body of the clip body of FIG. It is an enlarged plan view of the cylindrical body of the clip body of FIG. It is an expansion longitudinal cross-sectional view of the cylindrical body of the clip body of FIG. It is an enlarged front view of the rotating member of FIG. FIG. 12 is an enlarged longitudinal sectional view of the rotating member of FIG. 11. It is an exploded view which shows the clip body main part of FIG. 11, a cylindrical body, a rotation member, an intermediate shaft, and a rear shaft. It is a principal part expanded longitudinal cross-sectional view of the pen tip protrusion state (FIG. 17) of FIG.

<First Embodiment>
1 and 9 show an embodiment of the present invention. The thermochromic writing instrument 1 of the present embodiment includes a shaft tube 2, a writing body 9 accommodated in the shaft tube 2, and a pen tip of the writing body 9 that can be projected and retracted from a front end hole 31 of the shaft tube 2. And a haunting mechanism.

Writing body The writing body 9 includes a pen tip 91, an ink storage tube 92 in which the pen tip 91 is press-fitted and fixed to the front end opening, a thermochromic ink filled in the ink storage tube 92, It consists of a follower (for example, a high-viscosity fluid) that fills the rear end of the thermochromic ink and moves forward as the thermochromic ink is consumed.

The nib 91 is composed of, for example, either a metal ballpoint pen tip having a ball rotatably held at the front end, or a synthetic resin nib holder holding the rear outer surface of the ballpoint pen tip. It may be. Further, a tail plug provided with a vent hole through which the ink containing tube 92 and the outside can be vented is attached to the rear end opening of the ink containing tube 92. A spring that presses the ball at the front end forward is housed inside the nib 91. The spring is configured to include a rod portion at a front end portion of a compression coil spring,
The front end of the rod portion is in contact with the rear surface of the ball. When not writing, the ball is brought into close contact with the inner surface of the front end edge portion of the front end of the ballpoint pen tip by the forward urging of the spring, and ink leakage from the front end of the pen tip 91 and ink evaporation can be prevented.

Shaft cylinder The shaft cylinder 2 is connected to a tapered cylindrical front shaft 3, a cylindrical intermediate shaft 4 connected to the rear end portion of the front shaft 3, and a rear end portion of the intermediate shaft 4. It consists of a cylindrical rear shaft 5.

  FIG. 5 shows the front shaft 3. The front shaft 3 includes a tapered cylindrical main body 3a made of a synthetic resin (for example, polycarbonate resin) molded body and a grip portion 3b made of an elastic material provided on the outer surface of the main body 3a. The grip portion 3b is provided by two-color molding or mounting. The rear end portion of the front shaft 3 is reduced in diameter, and a male screw portion 32 is formed on the outer surface thereof. A front end hole 31 is provided in the front end of the front shaft 3 in the front-rear direction.

  FIG. 6 shows the intermediate shaft 4. The intermediate shaft 4 is formed of a cylindrical synthetic resin (for example, polycarbonate resin) molded body. A female thread portion 46 is formed on the inner surface of the front end portion of the intermediate shaft 4. The male screw portion 32 of the front shaft 3 can be screwed into the female screw portion 46. A reduced diameter portion 43 is integrally formed at the rear end portion of the intermediate shaft 4. The reduced diameter portion 43 is formed with a first long hole 44 extending in the front-rear direction, having a front end closed and a rear end open. Furthermore, outward projections 45 are integrally formed on the outer surface of the reduced diameter portion 43. A step portion 42 is integrally formed on the inner surface of the intermediate shaft 4 in front of the reduced diameter portion 43. A cam portion 41 is integrally formed on the inner surface of the intermediate shaft 4 in front of the step portion 42 (inner surface in front of the first long hole 44 of the intermediate shaft 4). The step portion 42 is integrally formed on the inner surface of the intermediate shaft 4 behind the cam portion 41 and in front of the first long hole 44 (that is, between the cam portion 41 and the first long hole 44). The A locking projection 47 is integrally formed on the outer surface of the intermediate shaft 4. In the pen tip immersion state, an object to be clamped such as a pocket can be clamped between the locking projection 47 and the ball portion 71 a of the clip body 7.

  FIG. 7 shows the rear shaft 5. The rear shaft 5 is made of a molded body of a cylindrical synthetic resin (for example, polycarbonate resin). The front end side wall of the rear shaft 5 is formed with a second long hole 51 extending in the front-rear direction with the front end open and the rear end closed. A mounting hole 52 is provided in the rear end of the rear shaft 5 in the front-rear direction. The friction portion 10 made of an elastic material is press-fitted into the mounting hole 52. Thereby, the friction part 10 is fixed to the outer surface of the rear end of the rear shaft 5. An inward projection 53 is integrally formed on the inner surface of the rear shaft 5. The width dimension of the second long hole 51 is set to be equal to the width dimension of the first long hole 44, thereby enabling the clip body 7 to move smoothly in the front-rear direction along the slide hole 21. .

  FIG. 8 shows the clip body 7. The clip body 7 includes a clip main body 71 extending in the front-rear direction, a base 72 integrally connected to a rear portion of the clip main body 71, and a shaft portion integrally connected to the base 72 and extending forward from the base 72. 73. The clip body 7 is obtained by a synthetic resin (for example, polycarbonate resin) molded body. The clip body 71 is provided with a ball 71a on the back surface. Cam teeth 73 a are integrally formed at the front end of the shaft portion 73.

-Assembly of a clip body The assembly of the said clip body 7 is demonstrated. The base 72 of the clip body 7 is inserted into the first elongated hole 44 from the rear end opening portion of the first elongated hole 44 of the intermediate shaft 4, and the shaft portion 73 of the clip body 7 is inserted into the intermediate shaft 4. Insert into. Thereafter, the inner surface of the rear shaft 5 is connected to the middle so that the first long hole 44 of the intermediate shaft 4 and the second long hole 51 of the rear shaft 5 communicate with each other in the radial direction (so as to overlap in the radial direction). The base portion 72 of the clip body 7 is inserted into the second long hole 51 from the front end opening portion of the second long hole 51 while being fitted to the outer surface of the reduced diameter portion 43 of the shaft 4. Thereby, the intermediate shaft 4 and the rear shaft 5 are connected to each other, and the first long hole 44 and the second long hole 51 form a slide hole 21 extending in the front-rear direction, and the slide hole The clip body 7 (a part of the clip main body 71 and the base 72) protrudes radially outward from 21 and can be slid in the front-rear direction along the slide hole 21 (slidable in the front-rear direction). Composed. At this time, the outward projection 45 on the outer surface of the reduced diameter portion 43 of the intermediate shaft 4 and the inward projection 53 on the inner surface of the rear shaft 5 get over and engage.

  By connecting the rear shaft 5 to which the friction portion 10 is fixed to the rear end portion of the intermediate shaft 4, the friction portion 10 is always fixed to the rear end of the shaft tube 2. Further, the front shaft 3 and the intermediate shaft 4 are detachably connected by screwing, whereby the writing body 9 can be exchanged.

-In / out mechanism The in / out mechanism is a side slide type in / out mechanism using a rotating cam mechanism. The retracting mechanism includes a cam portion 41 formed on the inner surface of the intermediate shaft 4, a rotating member 6 that engages with the cam portion 41 and contacts the rear end of the writing body 9, engages with the rotating member 6, and The clip body 7 protrudes radially outward from the slide hole 21 and the elastic body 8 (for example, a compression coil spring) accommodated in the shaft cylinder 2 and biases the writing body 9 backward. The retracting mechanism of the present embodiment is a double knock type in which both the pen tip protruding operation and the pen tip retracting operation slide the clip body 7 forward. The rotating member 6 is obtained by a synthetic resin (for example, polyacetal resin) molded body.

  The cam portion 41 includes a plurality of serrated cam teeth 41a protruding forward, and a plurality of cam grooves 41b formed between the cam teeth 41a and extending in the front-rear direction. The rotating member 6 includes a plurality of (for example, four) protrusions 61 extending in the front-rear direction on the outer surface thereof, and the protrusions 61 are engaged with the cam teeth 41 a of the cam portion 41 and the cam grooves 41 b of the cam portion 41. Combined. Cam teeth 73 a that engage with the rear end of the protrusion 61 of the rotating member 6 are integrally formed at the front end of the shaft portion 73 of the clip body 7.

When the clip body 7 is slid forward from the pen tip immersion state against the rear bias by the elastic body 8, the rotating member 6 is moved forward by the cam teeth 73a of the shaft portion 73 of the clip body 7. As the ridge 61 of the rotating member 6 moves forward along the cam groove 41b, the rotating member 6 presses the rear end of the writing body 9 forward, and the nib 91 moves to the front end hole. 31 protrudes from the outside. At this time, the rotating member 6 rotates by a certain angle with respect to the cam portion 41 by the contact between the cam teeth 73 a of the shaft portion 73 and the protrusion 61 of the rotating member 6. Thereby, the protrusion 61 of the rotating member 6 is engaged with the cam teeth 41a of the cam portion 41, and the pen tip protruding state is maintained.

  When the clip body 7 is slid forward from the pen tip protruding state, the shaft portion 73 of the clip body 7 presses the rotating member 6 forward, and the cam teeth 73a of the shaft portion 73 and the protrusion 61 of the rotating member 6 The rotating member 6 rotates by a certain angle with respect to the cam portion 41 by the contact. Accordingly, the engagement state between the protrusion 61 and the cam teeth 41a of the cam portion 41 is released, and the protrusion 61 is rearward along the cam groove 41b of the cam portion 41 due to the rearward biasing by the elastic body 8. Move to. As the rotating member 6 moves rearward, the writing body 9 moves rearward and enters the pen tip immersion state.

  The friction portion 10 is fixed to the outer surface of the rear end of the rear shaft 5 (shaft cylinder 2) without interlocking with the movement of the clip body 7 in the front-rear direction. The friction part 10 is provided independently of the clip body 7.

Another Example of Clip Body FIG. 9 shows another embodiment of the clip body 7. The difference from the clip body 7 of FIG. 8 of the present embodiment is that a cylindrical body 74 having cam teeth 74a is attached to the shaft portion 73 of the clip body 7, and other configurations and operational effects are shown in FIGS. Since it is the same as that of 8 embodiment, description is abbreviate | omitted. The cylindrical body 74 is obtained from a molded body of synthetic resin (for example, polyacetal resin).

-Friction part In this Embodiment, the elastic material which comprises the said friction part 10 has preferable the synthetic resin (rubber, elastomer) which has elasticity, for example, a silicone resin, SBS resin (styrene-butadiene-styrene copolymer) SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM), and the like. The elastic synthetic resin constituting the friction part 10 is a low-abrasion elastic material in which almost no wear debris (erasure debris) is generated during friction, compared to a high-abrasion elastic material (for example, an eraser). Preferably it consists of. The friction portion 10 may be provided at least on the outer surface of the rear end portion of the shaft tube 2. For example, the friction portion 10 made of an elastic material on the outer surface of the rear end portion of the shaft tube 2 or the outer surface of the rear end portion of the rear shaft 5. Can be fixed by press-fitting, engagement, screwing, fitting, adhesion, two-color molding, or the like, or a configuration in which the entire shaft cylinder 2 or the entire rear shaft 5 is integrally formed of an elastic material.

-Thermochromic ink In the present embodiment, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

  The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic pigment in which a reversible thermochromic composition containing at least the essential three components of a reaction medium for determining the occurrence temperature of the polymer is encapsulated in a microcapsule is preferably used.

In the present embodiment, as shown in FIG. 10, the shape of the curve plotting the change in color density due to the temperature change is higher than the color change temperature range, contrary to the case where the temperature is raised from the lower temperature side than the color change temperature range. The color changes by following a different route from the case of descending from the side, and the color develops in a low temperature region below the complete color development temperature (t ₁ ), or the color erases in a high temperature region above the complete color erase temperature (t ₄ ). It is preferable to apply a color memory holding type thermochromic ink whose state can be stored and held in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase holding temperature range)]. In FIG. 10, ΔH represents a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

In the present embodiment, the color change temperature due to frictional heat of the frictional part 10 of the thermochromic ink is set to 25 ° C. to 95 ° C. (preferably 36 ° C. to 95 ° C.). That is, in this embodiment, the high temperature side discoloration point [complete decoloration temperature (t ₄ )] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), and the low temperature side discoloration is performed. It is effective to set the point [complete color development temperature (t ₁ )] within a range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Thereby, while maintaining the color exhibited in a normal state (daily life temperature range) can be effectively functioned, the handwriting by the reversible thermochromic ink can be easily changed in color by the frictional heat generated by the friction portion 10.

  In the thermochromic writing instrument 1 of the present embodiment, since the friction part 10 is fixed to the outer surface of the rear end of the shaft tube 2, the friction part 10 is prevented from moving backward during the friction operation. 10 enables stable friction operation. In addition, the thermochromic writing instrument 1 of the present embodiment is provided with an operation part for operating the pen tip in the clip body 7, and by making the friction part 10 independent of the clip body 7 (operation part), When the pen tip 91 appears and disappears, the clip body 7 is operated and the friction portion 10 is not operated. Therefore, it is possible to avoid the friction portion 10 from being soiled with dirt or the like. Further, the thermochromic writing instrument 1 of the present embodiment has a protruding portion compared to the conventional multi-core type side slide type thermochromic writing instrument although the clip body 7 is provided on the outer surface of the shaft tube 2. The degree of freedom in appearance design is increased, and a smart appearance can be obtained.

  The thermochromic writing instrument 1 of the present embodiment is a side slide type retracting mechanism in which the retracting mechanism uses a rotating cam mechanism, and both the pen tip protruding operation and the pen tip retracting operation slide the clip body 7 forward. Since it is a type to operate (a so-called double knock type in / out mechanism), the operation method is simple and the user can easily learn the operation method.

  In the thermochromic writing instrument 1 of the present embodiment, the intermediate shaft 4 is formed by forming the slide hole 21 with the first long hole 44 opened rearward and the second long hole 51 opened forward. The clip body 7 can be inserted into the first long hole 44 and the second long hole 51 when connecting the rear shaft 5 to the rear shaft 5 (that is, when the slide hole 21 is formed). The clip body 7 and the shaft tube 2 can be easily inserted and assembled.

  The thermochromic writing instrument 1 of the present embodiment connects the side wall of the intermediate shaft 4 and the side wall of the rear shaft 5 so as to overlap in the radial direction, and the first elongated hole 44 and the second elongated hole. By making 51 communicate with the radial direction, it is possible to prevent the entire shaft tube 2 from becoming unnecessarily long.

In the thermochromic writing instrument 1 according to the present embodiment, the friction part 10 is made of an elastic material, and a part of the friction part 10 is in contact with the clip body 7 in the pen tip immersion state, so that the pen tip protrudes. Since the writing body 9 and the clip body 7 due to the rearward urging of the projectile body 8 are moved backward and the clip body 7 and the friction portion 10 made of an elastic material come into contact with each other, The impact applied to the cursive body 9 can be reduced. As a result, it is possible to prevent the backflow of ink in the writing body 9 and the mixing of air from the nib 91.

<Second Embodiment>
11 to 35 show a second embodiment of the present invention. The thermochromic writing instrument 1 according to the present embodiment includes a shaft tube 2, a writing body 9 accommodated in the shaft tube 2, and a pen tip 91 of the writing body 9 that can be projected and retracted from a front end hole 31 of the shaft tube 2. And a haunting mechanism.

-Writing body The writing body 9 includes a pen tip 91, an ink storage tube 92 in which the pen tip 91 is press-fitted and fixed to the front end opening, and a thermochromic ink 93 filled in the ink storage tube 92. It comprises a follower 94 (for example, a high-viscosity fluid) that fills the rear end of the thermochromic ink 93 and moves forward as the thermochromic ink 93 is consumed.

  The pen nib 91 is composed of, for example, only a metal ballpoint pen tip holding a ball rotatably at the front end, or a synthetic resin nib holder holding the rear outer surface of the ballpoint pen tip. It may be. A tail plug 95 having a vent hole through which the ink containing tube 92 and the outside can be vented is attached to the rear end opening of the ink containing tube 92. A spring that presses the ball at the front end forward is housed inside the nib 91. The spring includes a rod portion at a front end portion of a compression coil spring, and the front end of the rod portion is in contact with the rear surface of the ball. When not writing, the ball is brought into close contact with the inner surface of the front end edge portion of the front end of the ballpoint pen tip by the forward urging of the spring, and ink leakage from the front end of the pen tip 91 and ink evaporation can be prevented.

Shaft cylinder The shaft cylinder 2 is connected to a tapered cylindrical front shaft 3, a cylindrical intermediate shaft 4 connected to the rear end portion of the front shaft 3, and a rear end portion of the intermediate shaft 4. It consists of a cylindrical rear shaft 5.

  FIG. 18 shows the front shaft 3. The front shaft 3 includes a tapered cylindrical main body 3a made of a synthetic resin (for example, polycarbonate resin) molded body and a grip portion 3b made of an elastic material provided on the outer surface of the main body 3a. The grip portion 3b is provided by two-color molding or mounting on the outer surface of the main body 3a. The rear end portion of the front shaft 3 is reduced in diameter, and a male screw portion 32 is formed on the outer surface thereof. A front end hole 31 is provided in the front end of the front shaft 3 in the front-rear direction.

  The intermediate shaft 4 is shown in FIGS. The intermediate shaft 4 is formed of a cylindrical synthetic resin (for example, polycarbonate resin) molded body. A female thread portion 46 is formed on the inner surface of the front end portion of the intermediate shaft 4. The male screw portion 32 of the front shaft 3 can be screwed into the female screw portion 46. A reduced diameter portion 43 is integrally formed at the rear end portion of the intermediate shaft 4. A first long hole 44 extending in the front-rear direction is formed in the rear end side wall of the intermediate shaft 4, with the front end closed and the rear end open. Furthermore, outward projections 45 are integrally formed on the outer surface of the reduced diameter portion 43. A step portion 42 is integrally formed on the inner surface of the intermediate shaft 4 in front of the reduced diameter portion 43. A cam portion 41 is integrally formed on the inner surface of the intermediate shaft 4 in front of the step portion 42. Further, the front end of the first long hole 44 is positioned slightly in front of the stepped portion (that is, the rear end of the cam portion 41) and is positioned in the rear of the cam teeth 41a of the cam portion 41. . A guide groove 48 extending in the front-rear direction is formed on the outer surface of the intermediate shaft 4 in front of the first long hole 44. The ball portion 71 a of the clip body 7 is always engaged with the guide groove 48, and the ball portion 71 a of the clip body 7 moves in the front-rear direction along the guide groove 48 as the clip body 7 moves in the front-rear direction. It is movable. By the guide groove 48 and the ball portion 71a, an object to be held such as a pocket is firmly held.

  The rear shaft 5 is shown in FIGS. The rear shaft 5 is made of a molded body of a cylindrical synthetic resin (for example, polycarbonate resin). The front end side wall of the rear shaft 5 is formed with a second long hole 51 extending in the front-rear direction with the front end open and the rear end closed. A mounting hole 52 is provided in the rear end of the rear shaft 5 in the front-rear direction. The friction portion 10 made of an elastic material is press-fitted into the mounting hole 52. Thereby, the friction part 10 is fixed to the outer surface of the rear end of the rear shaft 5. An inward projection 53 is integrally formed on the inner surface of the rear shaft 5. The width dimension of the second long hole 51 is set to be equal to the width dimension of the first long hole 44, thereby enabling the clip body 7 to move smoothly in the front-rear direction along the slide hole 21. .

  FIG. 28 shows the clip body 7. The clip body 7 includes a clip main body 71 extending in the front-rear direction, a base 72 integrally connected to the rear portion of the clip main body 71, and a shaft portion integrally connected to the base 72 and extending forward from the base 72. 73, and a cylindrical body 74 attached to the shaft portion 73. The main part 7a of the clip body 7 is obtained by a molded body of synthetic resin (for example, polycarbonate resin). A plate-like ball portion 71 a is integrally projected on the back surface (inner surface) of the clip body 71.

  The shaft portion 73 includes a large-diameter portion 73b and a small-diameter portion 73c connected to the front of the large-diameter portion 73b and having an outer diameter smaller than the large-diameter portion 73b. A first outward projection 73d is integrally formed on the outer surface of the large diameter portion 73b, and a second outward projection 73e is integrally formed on the outer surface of the small diameter portion 73c. Examples of the first outward protrusion 73d and the second outward protrusion 73e include an annular protrusion or a distributed protrusion in which a plurality of protrusions are circumferentially distributed.

  A rib 72 a extending in the front-rear direction is formed on the outer surface of the base portion 72 of the clip body 7 or the outer surface of the shaft portion 73. The rib 72 a engages with a groove 49 extending in the front-rear direction formed on the inner surface of the rear end portion of the intermediate shaft 4, and the rib 72 a moves in the front-rear direction along the groove 49. Thereby, wobbling in the circumferential direction of the clip body 7 can be suppressed.

  A cylindrical body 74 is shown in FIGS. The cylindrical body 74 is attached to the outer surface of the shaft portion 73 of the clip body 7. Cam teeth 74 a are formed at the front end of the cylindrical body 74. Inside the cylindrical body 74, an inner hole penetrates in the front-rear direction, and an inward projection 74b is integrally formed on the inner surface of the inner hole. The cylindrical body 74 gets over and engages with the first outward projection 73d on the outer surface of the shaft portion 73 of the clip body 7, and the clip body 7 and the cylindrical body 74 are integrated and can move in the front-rear direction. A plurality of guide protrusions 74c are integrally formed on the outer surface of the cylindrical body 74, and the guide protrusions 74c are engaged with the cam groove 41b of the cam portion 41 so as to be movable in the front-rear direction. The rotation of the cylindrical body 74 in the cylinder 2 is prevented. The cylindrical body 74 is obtained from a molded body of synthetic resin (for example, polyacetal resin).

  32 to 33 show the rotating member 6. The rotating member 6 includes a plurality of (for example, four) protrusions 61 extending in the front-rear direction on the outer surface thereof, and the protrusions 61 are engaged with the cam teeth 41 a of the cam portion 41 and the cam grooves 41 b of the cam portion 41. Combined. An inner hole penetrating in the front-rear direction is formed in the rotating member 6. An inward projection 62 is formed on the inner surface of the inner hole of the rotating member 6. The rotating member 6 is obtained by a synthetic resin (for example, polyacetal resin) molded body.

  FIG. 35 shows an engaged state between the clip body 7 and the rotating member 6 in the pen tip protruding state. The inward protrusion 62 of the rotating member 6 gets over and engages with the second outward protrusion 73e of the clip body 7. Thereby, the clip body 7 and the rotating member 6 are prevented from coming off. The rotating member 6 has play in the front-rear direction and is rotatably attached. The play in the front-rear direction (movable amount) is set to such a small dimension as to enable engagement / disengagement between the protrusion 61 of the rotating member 6 and the cam teeth 41a of the cam portion 41.

-Assembly of a clip body The assembly of the said clip body 7 is demonstrated. The base 72 of the clip body 7 is inserted into the first long hole 44 from the rear end opening portion of the first long hole 44 of the intermediate shaft 4, and the cylindrical shaft portion 73 of the clip body 7 is placed in the middle. Insert into the shaft 4. Thereafter, the inner surface of the rear shaft 5 is connected to the middle so that the first long hole 44 of the intermediate shaft 4 and the second long hole 51 of the rear shaft 5 communicate with each other in the radial direction (so as to overlap in the radial direction). The base portion 72 of the clip body 7 is inserted into the second long hole 51 from the front end opening portion of the second long hole 51 while being fitted to the outer surface of the reduced diameter portion 43 of the shaft 4. Thereby, the intermediate shaft 4 and the rear shaft 5 are connected to each other, and the first long hole 44 and the second long hole 51 form a slide hole 21 extending in the front-rear direction, and the slide hole The clip body 7 (a part of the clip main body 71 and the base 72) protrudes radially outward from 21 and can be slid in the front-rear direction along the slide hole 21 (slidable in the front-rear direction). Composed. At this time, the outward projection 45 on the outer surface of the reduced diameter portion 43 of the intermediate shaft 4 and the inward projection 53 on the inner surface of the rear shaft 5 get over and engage.

  By connecting the rear shaft 5 to which the friction portion 10 is fixed to the rear end portion of the intermediate shaft 4, the friction portion 10 is always fixed to the rear end of the shaft tube 2. Further, the front shaft 3 and the intermediate shaft 4 are detachably connected by screwing, whereby the writing body 9 can be exchanged.

-In / out mechanism The in / out mechanism is a side slide type in / out mechanism using a rotating cam mechanism. The retracting mechanism includes a cam portion 41 formed on the inner surface of the intermediate shaft 4, a rotating member 6 that engages with the cam portion 41 and contacts the rear end of the writing body 9, engages with the rotating member 6, and The clip body 7 protrudes radially outward from the slide hole 21 and the elastic body 8 (for example, a compression coil spring) accommodated in the shaft cylinder 2 and biases the writing body 9 backward. The retracting mechanism of the present embodiment is a double knock type in which both the pen tip protruding operation and the pen tip retracting operation slide the clip body 7 forward.

  The cam portion 41 includes a plurality of serrated cam teeth 41a protruding forward, and a plurality of cam grooves 41b formed between the cam teeth 41a and extending in the front-rear direction. The rotating member 6 includes a plurality of (for example, four) protrusions 61 extending in the longitudinal direction on the outer surface thereof, and the protrusions 61 are engaged with the cam teeth 41 a of the cam portion 41 and the cam grooves 41 b of the cam portion 41. Combined. Cam teeth 74 a that engage with the rear end of the protrusion 61 of the rotating member 6 are integrally formed at the front end of the cylindrical body 74 attached to the shaft portion 73 of the clip body 7.

When the clip body 7 is slid forward from the pen tip immersion state against the rear bias by the bullet 8, the rotating member is moved by the cylindrical body 74 attached to the shaft portion 73 of the clip body 7. 6 is pressed forward, and as the protrusion 61 of the rotating member 6 moves forward along the cam groove 41b, the rotating member 6 presses the rear end of the writing body 9 forward, and the nib 91 Protrudes to the outside from the front end hole 31. At this time, the rotating member 6 rotates by a certain angle with respect to the cam portion 41 by contact between the cam teeth 74 a of the cylindrical body 74 attached to the shaft portion 73 and the protrusion 61 of the rotating member 6. Thereby, the protrusion 61 of the rotating member 6 is engaged with the cam teeth 41a of the cam portion 41, and the pen tip protruding state is maintained.

  When the clip body 7 is slid forward from the pen tip protruding state, the cylindrical body 74 attached to the shaft portion 73 of the clip body 7 presses the rotating member 6 forward, and the cam teeth 74a of the cylindrical body 74 and the rotation The rotating member 6 rotates by a certain angle with respect to the cam portion 41 by the contact of the member 6 with the protrusion 61. Accordingly, the engagement state between the protrusion 61 and the cam teeth 41a of the cam portion 41 is released, and the protrusion 61 is rearward along the cam groove 41b of the cam portion 41 due to the rearward biasing by the elastic body 8. Move to. As the rotating member 6 moves rearward, the writing body 9 moves rearward and enters the pen tip immersion state.

-Friction part In this Embodiment, the elastic material which comprises the said friction part 10 has preferable the synthetic resin (rubber, elastomer) which has elasticity, for example, a silicone resin, SBS resin (styrene-butadiene-styrene copolymer) SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM), and the like. The elastic synthetic resin constituting the friction part 10 is a low-abrasion elastic material in which almost no wear debris (erasure debris) is generated during friction, compared to a high-abrasion elastic material (for example, an eraser). Preferably it consists of. The friction portion 10 may be provided at least on the outer surface of the rear end portion of the shaft tube 2. For example, the friction portion 10 made of an elastic material is press-fitted into the rear end portion of the shaft tube 2 or the rear end portion of the rear shaft 5. , Engagement, screwing, fitting, bonding, two-color molding, or the like, or a configuration in which the entire shaft cylinder 2 or the entire rear shaft 5 is integrally formed of an elastic material.

-Thermochromic ink In the present embodiment, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

  The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic pigment in which a reversible thermochromic composition containing at least the essential three components of a reaction medium for determining the occurrence temperature of the polymer is encapsulated in a microcapsule is preferably used.

In the present embodiment, as shown in FIG. 10, the shape of the curve plotting the change in color density due to the temperature change is higher than the color change temperature range, contrary to the case where the temperature is raised from the lower temperature side than the color change temperature range. The color changes by following a different route from the case of descending from the side, and the color develops in a low temperature region below the complete color development temperature (t ₁ ), or the color erases in a high temperature region above the complete color erase temperature (t ₄ ). It is preferable to apply a color memory holding type thermochromic ink whose state can be stored and held in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase holding temperature range)]. In FIG. 10, ΔH represents a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

In the present embodiment, the color change temperature due to frictional heat of the frictional part 10 of the thermochromic ink is set to 25 ° C. to 95 ° C. (preferably 36 ° C. to 95 ° C.). That is, in this embodiment, the high temperature side discoloration point [complete decoloration temperature (t ₄ )] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), and the low temperature side discoloration is performed. It is effective to set the point [complete color development temperature (t ₁ )] within a range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Thereby, while maintaining the color exhibited in a normal state (daily life temperature range) can be effectively functioned, the handwriting by the reversible thermochromic ink can be easily changed in color by the frictional heat generated by the friction portion 10.

  In the thermochromic writing instrument 1 of the present embodiment, since the friction part 10 is fixed to the outer surface of the rear end of the shaft tube 2, the friction part 10 is prevented from moving backward during the friction operation. 10 enables stable friction operation. In addition, the thermochromic writing instrument 1 of the present embodiment is provided with an operation part for operating the pen tip in the clip body 7, and by making the friction part 10 independent of the clip body 7 (operation part), When the pen tip 91 appears and disappears, the clip body 7 is operated and the friction portion 10 is not operated. Therefore, it is possible to avoid the friction portion 10 from being soiled with dirt or the like. Further, the thermochromic writing instrument 1 of the present embodiment has a protruding portion compared to the conventional multi-core type side slide type thermochromic writing instrument although the clip body 7 is provided on the outer surface of the shaft tube 2. The degree of freedom in appearance design is increased, and a smart appearance can be obtained.

  The thermochromic writing instrument 1 of the present embodiment is a side slide type retracting mechanism in which the retracting mechanism uses a rotating cam mechanism, and both the pen tip protruding operation and the pen tip retracting operation slide the clip body 7 forward. Since it is a type to operate (a so-called double knock type in / out mechanism), the operation method is simple and the user can easily learn the operation method.

  In the thermochromic writing instrument 1 of the present embodiment, the intermediate shaft 4 is formed by forming the slide hole 21 with the first long hole 44 opened rearward and the second long hole 51 opened forward. The clip body 7 can be inserted into the first long hole 44 and the second long hole 51 when connecting the rear shaft 5 to the rear shaft 5 (that is, when the slide hole 21 is formed). The clip body 7 and the shaft tube 2 can be easily inserted and assembled.

  The thermochromic writing instrument 1 of the present embodiment connects the side wall of the intermediate shaft 4 and the side wall of the rear shaft 5 so as to overlap in the radial direction, and the first elongated hole 44 and the second elongated hole. By making 51 communicate with the radial direction, it is possible to prevent the entire shaft tube 2 from becoming unnecessarily long.

  In the thermochromic writing instrument 1 of the present embodiment, the clip body 7 has a shaft portion 73 that is accommodated in the shaft tube 2 and extends in the front-rear direction, and the shaft portion 73 and the rotating member 6 are By being locked in the front-rear direction while being able to rotate relative to each other and having play in the front-rear direction, inadvertent movement of the clip body 7 in the front-rear direction can be suppressed in the pen tip protruding state. As a result, even if the vicinity of the clip body 7 is gripped with the pen tip protruding, a stable friction operation can be performed.

  In the thermochromic writing instrument 1 of the present embodiment, a guide groove 48 extending in the front-rear direction is formed on the outer surface of the shaft cylinder 2 in front of the slide hole 21, and a ball portion 71 a is formed on the inner surface of the front portion of the clip body 7. And the ball 71a slides in the front-rear direction in the guide groove 48 as the clip body 7 moves in the front-rear direction, thereby improving the clip clamping performance and the side of the clip body 7 The wobbling of the direction (circumferential direction) can be prevented.

  In the thermochromic writing instrument 1 of the present embodiment, the friction portion 10 can be made of an elastic material, and a part of the friction portion 10 can be brought into contact with the clip body 7 in the pen tip immersion state. Thereby, when changing from the pen tip protruding state to the pen tip immersing state, the writing body 9 and the clip body 7 are moved backward by the rear urging of the elastic body 8, and the clip body 7 and the friction portion 10 made of an elastic material are brought into contact. Since it abuts, the impact applied to the cursive body 9 can be reduced. As a result, it is possible to prevent backflow of ink in the writing body 9 and air from the nib 91.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Slide hole 3 Front shaft 31 Front end hole 32 Male screw part 3a Main body 3b Gripping part 4 Intermediate shaft 41 Cam part 41a Cam tooth 41b Cam groove 42 Step part 43 Reduced diameter part 44 First long hole 45 outward projection 46 female thread portion 47 locking projection 48 guide groove 49 groove 5 rear shaft 51 second long hole 52 mounting hole 53 inward projection 6 rotating member 61 ridge 62 inward projection 7 clip body 71 clip body 71a ball portion 72 base 72a rib 73 shaft portion 73a cam teeth 73b large diameter portion 73c small diameter portion 73d first outward projection 73e second outward projection 74 cylindrical body 74a cam teeth 74b inward projection 74c guide projection 7a main portion 8 projectile 9 cursive body 91 Nib 92 Ink receiving tube 93 Thermochromic ink 94 Follower 95 Tail plug 10 Friction part

Claims (19)

A writing body containing thermochromic ink inside is housed in the shaft cylinder, the operation body provided on the shaft cylinder is operated to move the writing body in the front-rear direction, and the pen tip of the writing body is moved to the writing tool. A thermochromic writing instrument configured to be able to appear and disappear from the tip,
A friction portion capable of thermally discoloring the handwriting by frictional heat generated by rubbing the handwriting of the thermochromic ink, and at least one clip body as the operation body, and the friction portion of the shaft tube. A thermochromic writing instrument characterized in that it is provided at the rear end and the clip body is provided at a portion other than the rear end of the shaft tube.   2. The heat according to claim 1, wherein only the single clip body is provided as the operation body, and the pen tip of the writing body can be brought into a protruding state and an immersion state by operating the single clip body. Discoloring writing instrument.   A slide mechanism extending in the front-rear direction on a side wall of the shaft cylinder, and a sliding mechanism that moves the clip body disposed in the slide hole forward, thereby bringing the pen tip of the writing body into a projecting state from a retracted state. The thermochromic writing instrument according to claim 1 or 2, further comprising:   The shaft cylinder is composed of two or more parts that can be connected to each other, and the first or second length that is open at the front end or the rear end and extends in the front-rear direction on each side wall of the two parts constituting the shaft cylinder The thermochromic writing instrument according to claim 3, wherein each of the first and second elongated holes communicates with each other to form the slide hole when a hole is provided and the two parts are connected.   The side walls of the two parts constituting the shaft cylinder are connected to each other so as to overlap each other in the radial direction, and the first and second elongated holes communicate with each other in a state where they overlap each other in the radial direction. The thermochromic writing instrument according to claim 4, which forms Inserting a base portion of the clip body into the first elongated hole provided in one of the components constituting the shaft cylinder;
While inserting the base of the clip body into the second long hole provided in the other part constituting the shaft cylinder, the other part is connected to the one part, and the second long hole is formed. Forming the slide hole in communication with the first elongated hole;
The thermochromic writing instrument according to claim 4 or 5, wherein the clip body is assembled to the slide hole through the above.   A cam mechanism as the retracting mechanism is provided in the shaft cylinder, and the cam mechanism includes cam portions and protrusions that can be alternately engaged at different positions in the front-rear direction, and slides the clip body forward. The cam portions and the protrusions are alternately engaged at different positions in the front-rear direction, and the pen tip of the writing body is alternately protruded or immersed, according to any one of claims 3 to 6. Thermochromic writing instrument. As the retracting mechanism, a plurality of cam teeth and cam grooves extending in the front-rear direction alternately arranged along the circumferential direction, and rotatably arranged behind the writing body, the cam teeth or the cam grooves are alternately arranged. A rotating member having a plurality of protrusions that can be engaged with each other, a plurality of other cam teeth that are provided on the clip body and rotate the rotating member, and a resilient body that urges the writing body backward. In the shaft tube,
By sliding the clip body forward against the urging force of the elastic body, the protrusions are alternately engaged with the cam teeth or the cam grooves, and the pen tip of the writing body is alternately placed. The thermochromic writing instrument according to claim 7, wherein the thermochromic writing instrument is in a protruding state or an immersive state.   The clip body includes a shaft portion that is accommodated in the shaft cylinder and extends in the front-rear direction, and the shaft portion and the rotating member are locked to each other in a state of having a play in the front-rear direction. Thermochromic writing instrument.   A guide groove extending in the front-rear direction is formed on the outer surface of the shaft cylinder in front of the slide hole, and a ball portion is projected from the front inner surface of the clip body, along with the movement of the clip body in the front-rear direction, The thermochromic writing instrument according to any one of claims 3 to 9, wherein the ball portion slides back and forth in the guide groove.   The thermochromic writing instrument according to any one of claims 1 to 10, wherein the friction part is made of an elastic material, and a part of the friction part is in contact with a clip body in a pen tip immersion state.   The friction portion is made of an elastic material, and is fixed to the rear end of the shaft tube by press-fitting, engagement, screwing, fitting, adhesion, two-color molding, or the entire shaft tube is elastic as the friction portion. The thermochromic writing instrument according to any one of claims 1 to 11, formed of a material. A thermochromic ink is accommodated in 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 urged rearward in a shaft cylinder. A thermochromic writing instrument that is movably accommodated in a direction and configured so that the pen tip of the cursive body can protrude and retract from the front end hole of the shaft cylinder,
A slide hole extending in the front-rear direction is provided in a side wall of the shaft cylinder, a clip body is projected radially outward from the slide hole, and the clip body is configured to be movable in the front-rear direction along the slide hole. A retractable mechanism that slides the clip body forward from the first immersion state to project the pen tip from the front end hole of the shaft cylinder, and operates the clip body from the pen tip projected state to retract the pen tip. A thermochromic writing instrument characterized in that a frictional portion capable of rubbing the handwriting of the thermochromic ink at the rear end of the shaft tube and thermally discoloring the handwriting by frictional heat generated at that time is provided.   The in / out mechanism is a side slide type in / out mechanism using a rotating cam mechanism, at least a cam portion formed on the inner surface of the shaft cylinder, and a rotating member that engages with the cam portion and contacts the rear end of the writing body And a clip body having a cam tooth that engages with the rotating member, and a resilient body that is accommodated in the shaft cylinder and biases the writing body rearward, and a pen tip protruding operation and a pen tip immersing operation. 14. The thermochromic writing instrument according to claim 13, which is a type in which the clip body is slid forward.   The shaft cylinder includes a front shaft, an intermediate shaft coupled to the rear end portion of the front shaft, and a rear shaft coupled to the rear end portion of the intermediate shaft, and a pen tip is disposed at the front end of the front shaft. A front end hole capable of appearing and retracting is provided, a cam portion is provided on the inner surface of the intermediate shaft, a first elongated hole opened rearward and extending in the front-rear direction is provided at the rear end portion of the intermediate shaft, and the front end of the rear shaft is provided. A second long hole that is open forward and extends in the front-rear direction is provided in the portion, and the rear end portion of the intermediate shaft and the front end portion of the rear shaft are connected to the first long hole and the second long hole. The coupling is made to communicate, the slide hole is formed in a side wall of the shaft cylinder by the first long hole and the second long hole, and a friction portion is provided at the rear end of the rear shaft. The thermochromic writing instrument described in 1.   The heat according to claim 15, wherein the side wall of the intermediate shaft and the side wall of the rear shaft are connected so as to overlap each other in the radial direction, and the first long hole and the second long hole are communicated in the radial direction. Discoloring writing instrument.   The clip body has a shaft portion that is accommodated in the shaft cylinder and extends in the front-rear direction, and the shaft portion and the rotation member are rotatable in the front-rear direction with each other being rotatable with respect to each other. The thermochromic writing instrument according to any one of claims 13 to 16, which is locked.   A guide groove extending in the front-rear direction is formed on the outer surface of the shaft cylinder in front of the slide hole, and a ball portion projects from the front inner surface of the clip body. The thermochromic writing instrument according to any one of claims 13 to 17, wherein the ball portion slides in the front-rear direction in the guide groove.   The thermochromic writing instrument according to any one of claims 13 to 18, wherein the friction part is made of an elastic material, and a part of the friction part is in contact with a clip body in a pen tip immersion state.

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