JP2023156497A - 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 thermochromic writing instruments. In detail, a thermochromic ink is housed inside a writing body, a pen tip capable of discharging the thermochromic ink is provided at the front end of the writing body, and the writing body is movable in the front-rear direction within a barrel. The present invention relates to a thermochromic writing instrument, which is housed in a thermochromic writing instrument, and has a pen tip of the writing body configured to be retractable from a front end hole of a barrel.

Patent Document 1 discloses that a writing body is housed in a barrel so as to be movable in the front and back direction, an operating section is provided on the outer surface of the barrel, and by operating the operating section, the pen tip of the writing instrument is moved in the barrel. The writing body is configured to be removable and ejectable from the front end hole, a thermochromic ink is housed inside the writing body, a pen tip capable of ejecting the thermochromic ink is provided at the front end of the writing body, and on the outer surface of the barrel, A thermochromic writing instrument is disclosed which is provided with a friction portion that can heat and discolor the handwriting by rubbing the handwriting of the thermochromic ink and using the frictional heat generated at the time.

Patent Document 1 discloses that in a type that presses the operating section at the rear end of the barrel forward, when the operating section is provided with a friction section, when a friction operation is performed using the friction section, the operating section moves forward by the writing surface. However, stable friction operation may not be possible. In particular, if both the pen tip protrusion operation and the pen tip retraction operation adopt a type of ejection/retraction mechanism in which the operation part is pushed forward (so-called double knock type) and a friction part is provided on the operation part, the pen tip protrusion In this state, the operating body may wobble in the front-back direction, making it impossible to perform stable frictional operations.

Further, in FIG. 12 of Patent Document 1, a cylindrical operating section is provided so as to be movable in the front-rear direction, and a clip that can be held in a pocket or the like protrudes from the outer surface of the cylindrical operating section, and the cylindrical operating section is A configuration is disclosed in which a friction portion is provided on the outer surface of the rear end of the operating portion. However, in the thermochromic writing instrument having this configuration, since the friction part is pressed when the pen tip is operated to protrude and retract, there is a risk that the friction part may be stained with dirt from the user's hand. If the handwriting of the thermochromic ink is rubbed with the friction portion in a dirty state, there is a risk that the writing surface (for example, the paper surface) having the handwriting will become dirty.

Further, in FIG. 15 of Patent Document 1, an operating section is projected radially outward from the side wall of the shaft cylinder, and the operating section is pushed forward against the rearward bias to remove the pen tip from the retracted state. A configuration is disclosed in which a pen tip is provided with a protruding and retracting mechanism configured to make the pen tip protrude (a so-called multi-core side slide type), and a friction portion is provided on the outer surface of the rear end of the barrel. However, with this thermochromic writing instrument, when changing from the pen tip protruding state to the pen tip recessed state (when canceling the pen tip protruding state), it is necessary to operate the operating body attached to another writing instrument. . Therefore, it is necessary to provide a plurality of operating bodies (that is, a plurality of protruding parts), which reduces the degree of freedom in terms of external design. Furthermore, when a clip that can be held in a pocket or the like is provided on the barrel, the number of protruding parts increases further, reducing the degree of freedom in terms of external design.

International Publication No. 2008/105227 pamphlet

The present invention solves the above-mentioned conventional problems, and enables stable friction operation using a friction part.Furthermore, it is possible to prevent the friction part from getting dirty with hand grime, etc., and moreover, it allows freedom in external design. It is an object of the present invention to provide a thermochromic writing instrument whose strength increases.

In addition to the above, the present invention aims to provide a thermochromic writing instrument that has 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 is possible to avoid unnecessary lengthening of the entire barrel.
(4) Even when gripping the vicinity of the clip body with the pen tip protruding, stable frictional operation is possible.
(5) The clamping performance of the clip body is improved and wobbling of the clip body can be prevented.
(6) When the pen tip is changed from a protruding state to a retracted state, the impact applied to the cursive writing can be alleviated.

In the present invention, "front" refers to the pen tip side, and "rear" refers to the opposite side. In the present invention, the "pen tip recessed state" refers to a state in which the pen tip is recessed into the barrel, and the "pen tip protruding state" refers to a state in which the pen tip protrudes outside from the front end of the barrel. means.

In order to achieve the above object, the thermochromic writing instrument of the present invention accommodates a writing body containing thermochromic ink inside a barrel, and operates an operating body provided in the barrel to write the writing instrument. The thermochromic writing instrument is configured such that the body can be moved in the front-back direction and the pen tip of the writing instrument can be retracted from the tip of the writing instrument, and the thermochromic writing instrument can be used to rub the handwriting of the thermochromic ink and use the frictional heat generated at that time to write the pen. A friction part capable of thermally discoloring handwriting; and at least one clip body as the operating body, the friction part being provided at the rear end of the barrel, and the clip being provided at a portion of the barrel other than the rear end. It has a structure with a body.

According to the above configuration, since the friction part is provided at the rear end of the shaft tube independently from the clip body (operation body), the friction part does not move rearward during friction operation, and the friction part is not used. The friction operation that was previously used becomes stable. In addition, since there is no need to touch the friction part when performing the operation of protruding and retracting the pen tip, it is possible to prevent the friction part from becoming dirty with hand grime or the like.

Preferably, the above-mentioned thermochromic writing instrument of the present invention includes only a single clip body as the operating body, and by operating the single clip body, the pen tip of the writing body can be brought into a protruding state and It has a configuration that allows it to be in an immersive state.

According to the above configuration, the operation of protruding and retracting the pen tip can be performed using a single clip body, and there is no need to provide a plurality of operation bodies (i.e., a plurality of protruding parts) on the barrel. Furthermore, since the clip body serving as the operating body doubles as a clip that can be held in a pocket etc., it is possible to eliminate the protruding part as an operating body in terms of appearance, increasing the degree of freedom in the design of the thermochromic writing instrument. You can get a smart look.

In the thermochromic writing instrument of the present invention described above, the barrel may be composed of a plurality of parts that can be connected to each other, and in this case, the portion including the rear end of the barrel is the rear shaft as the part. The friction portion may be provided at the rear end of the rear shaft. That is, the barrel constituting the present thermochromic writing instrument may be a single cylindrical body, or may be a single cylindrical body formed by connecting a plurality of parts to each other.

Preferably, in the above-mentioned thermochromic writing instrument of the present invention, a slide hole extending in the front-rear direction is provided in the side wall of the barrel, and by sliding the clip body disposed in the slide hole forward, the writing The structure includes a retractable mechanism that changes the pen tip of the body from a retracted state to a protruded state.

According to the above configuration, by sliding the clip body forward, the pen tip can be brought into the protruding and retracting states (so-called double-knock mechanism), and the operation method is simple, allowing the user to operate the pen tip. Easy to learn method.

Preferably, in the above-mentioned thermochromic writing instrument of the present invention, the barrel is made up of two or more parts that can be connected to each other, and each side wall of the two parts constituting the barrel has a front end or a rear end. A first or second elongated hole is provided that is open and extends in the front-rear direction, and when the two parts are connected, the first and second elongated holes communicate with each other to form the slide hole. composition.

According to the above configuration, for example, when the slide hole is formed by the first elongated hole opened to the rear and the second elongated hole opened to the front, the two parts constituting the shaft cylinder are connected. When forming the slide hole (that is, when forming the slide hole), the mounting portion of the clip body can be easily inserted into the slide hole through the open ends of the first and second elongated holes, and the clip body and the shaft cylinder can be easily inserted into the slide hole. It becomes possible to assemble efficiently.

Preferably, in the thermochromic writing instrument of the present invention described above, the side walls of the two parts constituting the barrel are connected so as to overlap each other in the radial direction, and the first and second elongated holes are The slide holes are configured to communicate with each other while overlapping each other in the radial direction to form the slide hole.

According to the above configuration, the first and second elongated holes are communicated with each other while overlapping each other in the radial direction, thereby making it possible to avoid unnecessary lengthening of the entire shaft cylinder. That is, the overlapping portion of the first and second elongated holes does not affect the overall length of the slide hole. Note that the configuration of "overlapping in the radial direction" will be described in detail later using a specific example.

More preferably, in the thermochromic writing instrument of the present invention described above, the step of inserting the base of the clip body into the first elongated hole provided in one of the parts constituting the barrel; While inserting the base of the clip body into the second elongated hole provided in the other component, the other component is connected to the one component, and the second elongated hole is inserted into the first elongated hole. The clip body is assembled into the slide hole through a step of forming the slide hole in communication with the elongated 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 to align and align the first and second long holes. It becomes possible to easily connect the parts of the above and other parts.

Preferably, in the above-mentioned thermochromic writing instrument of the present invention, a cam mechanism as the projecting/retracting mechanism is provided in the barrel, and the cam mechanism includes a cam portion and a cam portion that can be engaged alternately at different positions in the front and rear directions. By sliding the clip body forward, the cam part and the protrusion are alternately engaged at different positions in the front and back direction, and the pen tip of the cursive writing body is alternately placed in a protruding state or a retracted state. The configuration is as follows.

More preferably, the protruding and retracting mechanism includes a plurality of cam teeth and cam grooves extending in the front-rear direction and arranged alternately along the circumferential direction, and a plurality of cam teeth and cam grooves arranged rotatably behind the writing body, a rotating member having a plurality of protrusions that can be alternately engaged with cam grooves; a plurality of other cam teeth provided on the clip body for rotating the rotating member; and urging the writing body backward. an elastic body is provided in the shaft cylinder, and by sliding the clip body forward against the biasing force of the elastic body, the protrusions are alternately attached to the cam teeth or the cam grooves. The pen tip of the cursive writing body may be engaged with the writing body to alternately make the pen tip of the writing body protrude or retract.

According to this configuration, it is possible to configure a double-knock type retracting mechanism that allows the pen tip to be brought into the protruding state and retracted state by simply sliding the clip body forward using the cam mechanism. The operating method of this thermochromic writing instrument is extremely simple, and users can easily learn how to operate it.

Preferably, in the ejection/retraction mechanism of the thermochromic writing instrument described above, the clip body has a shaft part housed in the shaft tube and extending in the front-rear direction, and the shaft part and the rotating member are arranged in the front-rear direction. The structure is such that they are locked to each other with a play of .

According to such a configuration, the shaft portion of the clip body and the rotating member are locked in a state with play in the front and back direction, so that the pen tip is in a protruding state (that is, the cam teeth and the protrusions are in the forward state). 2), the clip body that has moved forward in the slide hole is prevented from moving backward. As a result, when a friction operation is performed with the pen tip in a protruding state, even if the vicinity of the clip body is grasped, the clip body does not move inadvertently, and stable friction operation is possible.

Preferably, in the ejection/retraction mechanism of the thermochromic writing instrument described above, a guide groove extending in the front-rear direction is formed on the outer surface of the barrel in front of the slide hole, and a ball portion is protruded on the inner surface of the front portion of the clip body. The ball portion is configured to slide in the guide groove in the front-back direction as the clip body moves in the front-back direction.

According to the above configuration, when the clip body is slid, the ball slides along the guide groove and guides the clip body in the front and back direction, thereby preventing the clip body from wobbling in the lateral direction (circumferential direction). can do. Further, when an object to be held, such as a clothing pocket or a notebook, is held between the clip body, the object to be held is held between the ball portion and the guide groove, so that the holding performance of the clip body is improved.

Preferably, in the ejection/retraction mechanism of the thermochromic writing instrument described above, the frictional part is made of an elastic material, and a part of the frictional part is in contact with the clip body in the retracted state of the pen tip.

According to the above configuration, when the pen tip is changed from the protruding state to the pen tip retracting state, the clip body that has moved to the rear of the slide groove comes into contact with the friction part made of an elastic material, so the impact that is applied to the writing body at this time can be alleviated. As a result, it is possible to prevent backflow of ink inside the writing body and prevention of air intrusion from the pen tip.

In the ejection/retraction mechanism of the thermochromic writing instrument described above, the friction part is made of an elastic material, and press-fits, engages, screws, fits, adheres to the rear end of the barrel or the rear end of the rear shaft. The friction portion may be fixed by color molding, or the entire barrel or the rear shaft may be made of an elastic material as the friction portion.

According to the above configuration, the friction part can be fixed sufficiently firmly to the rear end of the shaft cylinder, and the friction part will not move backward or fall off during friction operation, and the friction part can be fixed firmly to the rear end of the shaft cylinder. Friction operation becomes stable.

More specific embodiments <1> to <7> of the present invention described above will be described below with reference to the reference numerals in FIGS. 1 to 35.

<1> The thermochromic writing instrument 1 according to the first embodiment stores thermochromic ink inside a writing body 9, and has a pen tip capable of discharging the thermochromic ink at the front end of the writing body 9. 91 is provided, and the writing body 9 is housed in the barrel 2 so as to be movable in the front and back direction while being biased backward, and the pen tip 91 of the writing body 9 can be retracted and retracted from the front end hole 31 of the barrel 2. A thermochromic writing instrument configured as shown in FIG. It is configured to be movable in the front-back direction along the slide hole 21, and by sliding the clip body 7 forward from the pen tip retracted state, the pen tip 91 is brought into a protruding state from the front end hole 31 of the shaft tube 2, and the pen tip is moved forward. The pen tip 91 is provided with a retractable mechanism that makes the pen tip 91 retract by operating the clip body 7 from the protruding state, and the handwriting of the thermochromic ink is rubbed against the rear end of the barrel 2, and the frictional heat generated at that time is used to It is configured to include a friction part 10 that can thermally change the color of the handwriting.

In the thermochromic writing instrument 1 according to the first embodiment, the friction part 10 is provided at the rear end of the barrel 2, so that the friction part 10 is prevented from moving backward during friction operation. , stable friction operation is possible using the friction section 10. In addition, the thermochromic writing instrument 1 according to the first embodiment has an operating section for operating the pen tip protrusion and retraction on the clip body 7, and the friction section 10 is independent from the clip body 7 (operating section). As a result, when the pen tip 91 is moved in and out, the clip body 7 is operated and the friction part 10 is not operated, so that the friction part 10 can be prevented from becoming dirty with dirt from the hands or the like. Furthermore, although the thermochromic writing instrument 1 according to the first embodiment is provided with the clip body 7 on the outer surface of the barrel tube 2, it is compared to the conventional multi-core type side-sliding type thermochromic writing instrument. , there are fewer protruding parts, the degree of freedom in external design increases, and a smart appearance can be obtained.

In the present invention, the clip body 7 can be held between the outer surface of the shaft tube 2 and an object to be held, such as a clothing pocket or a notebook. In the present invention, the friction part 10 may be configured to fix the friction part 10 to the rear end of the barrel 2 at least during a friction operation. The structure may be such that it protrudes and retracts from the rear end of the shaft cylinder 2 by operation. In the present invention, operating the clip body 7 from the pen tip protruding state is an operation for canceling the pen tip protruding state, and includes, for example, sliding the clip body 7 forward, or moving the clip body 7 radially inward. Examples include pressing the clip body 7 in the opposite direction or rotating the clip body 7. In the present invention, the time of friction operation refers to the time of friction operation using the friction section 10. During the frictional operation, the pen tip may be in either a protruding state or a retracted state.

<2> In the thermochromic writing instrument 1 according to the second embodiment, in the writing instrument 1 of the first invention, the protruding and retracting mechanism is a side slide type protruding and retracting mechanism using a rotating cam mechanism, and the barrel 2 A cam portion 41 formed on the inner surface, a rotating member 6 that engages with the cam portion 41 and comes into contact with the rear end of the writing body 9, and cam teeth 73a, 74a that engage with the rotating member 6. It consists of a clip body 7 and a resilient body 8 that is housed in the barrel 2 and urges the writing body 9 backward, and both the pen tip protrusion operation and the pen tip retraction operation cause the clip body 7 to move forward. The structure is a slide operation type.

In the thermochromic writing instrument 1 according to the second embodiment, the ejection mechanism is a side sliding ejection mechanism using a rotating cam mechanism, and both the pen tip protrusion operation and the pen tip retraction operation are performed using the clip body 7. Since it is a type that slides forward (a so-called double-knock mechanism), it is easy to operate, and users can easily learn how to operate it.

<3> A thermochromic writing instrument 1 according to a third embodiment is the thermochromic writing instrument 1 of the first or second invention, in which the barrel tube 2 has a front shaft 3 and a front shaft 3. It consists of an intermediate shaft 4 connected to a rear end portion, and a rear shaft 5 connected to the rear end portion of the intermediate shaft 4, and a front end hole 31 is provided at the front end of the front shaft 3 through which a pen tip 91 can go in and out. A cam portion 41 is provided on the inner surface of the intermediate shaft 4, a first elongated hole 44 is provided at the rear end of the intermediate shaft 4 and extends in the front-rear direction, and a first elongated hole 44 is provided at the front end of the rear shaft 5. A second elongated hole 51 is provided that is open to the front and extends in the front-rear direction, and the rear end of the intermediate shaft 4 and the front end of the rear shaft 5 are connected to the first elongated hole 44 and the second elongated hole 51. The slide hole 21 is formed in the side wall of the shaft cylinder 2 by the first elongated hole 44 and the second elongated hole 51, and a friction portion is formed on the outer surface of the rear end of the rear shaft 5. 10 is fixed.

The thermochromic writing instrument 1 according to the third embodiment has the slide hole 21 formed by the first elongated hole 44 opened to the rear and the second elongated 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, in which the side wall of the intermediate shaft 4 and the side wall of the rear shaft 5 are radially aligned with each other. The first elongated hole 44 and the second elongated hole 51 are connected in a radial direction so as to be overlapped with 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 with each other in the radial direction, and connects the first elongated hole 44 and the side wall of the rear shaft 5 to By communicating with the second elongated hole 51 in the radial direction, it is possible to prevent the entire shaft tube 2 from becoming unnecessarily long. In the present invention, connecting 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 means, for example, connecting 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 radially. A configuration in which the inner surface of the side wall of the intermediate shaft 4 and an outer surface of the side wall of the rear shaft 5 are connected so as to overlap in the radial direction (for example, by fitting or screwing). One example is the configuration. 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 are connected to each other so as to overlap each other in the radial direction. Any configuration is sufficient as long as they are connected so as to overlap each other in the radial direction.

<5> The thermochromic writing instrument 1 according to the fifth embodiment is the thermochromic writing instrument 1 of the second, third or fourth invention, in which the clip body 7 is housed in the barrel tube 2. and has a shaft portion 73 extending in the front-back direction, and the shaft portion 73 and the rotating member 6 are configured to be locked in the front-back direction in a state where they can rotate with each other and have play in the front-back direction with respect to each other. There is.

In the thermochromic writing instrument 1 according to the fifth embodiment, the clip body 7 has a shaft portion 73 that is housed in the shaft tube 2 and extends in the front-rear direction, and the shaft portion 73 and the rotating member 6 are mutually rotatable and are locked in the front-rear direction with play in the front-back direction, so that the rotating member 6 is locked with the cam teeth 41a of the cam part 41 in the pen tip protruding state, The backward movement of the rotating member 6 is prevented, and the accidental movement of the clip body 7 in the front and rear directions is suppressed. As a result, even if the user grips the vicinity of the clip body 7 with the pen tip protruding, stable frictional operation is possible.

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

The thermochromic writing instrument 1 according to the sixth embodiment has a guide groove 48 extending in the front-rear direction formed on the outer surface of the shaft tube 2 in front of the slide hole 21, and a guide groove 48 extending in the front-rear direction. A ball portion 71a is provided in a protruding manner, and as the clip body 7 moves in the front-back direction, the ball portion 71a slides in the guide groove 48 in the front-back direction, thereby improving the gripping performance of the clip body. Wobbling of the clip body 7 in the lateral direction (circumferential direction) can be prevented.

<7> A 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 portion 10 is made of an elastic material, and the friction portion 10 is made of an elastic material. A portion of the pen tip 10 is in contact with the clip body 7 in the pen tip recessed state.

In the thermochromic writing instrument 1 according to the seventh embodiment, the frictional part 10 is made of an elastic material, and a part of the frictional part 10 is in contact with the clip body 7 in which the pen tip is retracted. When changing from the pen tip protruding state to the pen tip retracting state, the writing body 9 and the clip body 7 move backward due to the backward bias of the resilient body 8, and the clip body 7 and the friction part 10 made of an elastic material come into contact with each other. , the impact applied to the writing 9 at that time can be alleviated. As a result, it is possible to prevent the backflow of ink within the writing body 9 and the mixing of air from the pen tip 91.

The thermochromic writing instrument of the present invention enables stable friction operation using the friction part, and also prevents the friction part from getting dirty with finger marks, etc. Moreover, the degree of freedom in external design is increased, and it has a smart appearance. You can get the look.

FIG. 3 is a side view showing the pen tip retracted state of the first embodiment of the present invention. FIG. 2 is a front view of FIG. 1; FIG. 2 is a side view showing the pen tip of FIG. 1 in a protruding state. FIG. 2 is a longitudinal cross-sectional view of FIG. 1; FIG. 2 is an enlarged longitudinal cross-sectional view of the front shaft of FIG. 1; FIG. 2 is an enlarged vertical cross-sectional view of the intermediate shaft and an enlarged side view of the rotating member in FIG. 1. FIG. FIG. 2 is an enlarged vertical cross-sectional view of the rear shaft of FIG. 1 and an enlarged side view of a friction portion. FIG. 2 is an enlarged side view of the clip body of FIG. 1; FIG. 7 is an enlarged longitudinal sectional view showing another embodiment of the clip body of the present invention. It is an explanatory view showing color change behavior of thermochromic ink. It is a side view which shows the pen tip recessed state of the 2nd Embodiment of this invention. FIG. 12 is a front view of FIG. 11; FIG. 12 is a side view showing the pen tip of FIG. 11 in a protruding state. FIG. 12 is a longitudinal cross-sectional view of FIG. 11; 15 is an enlarged cross-sectional view taken along the line AA in FIG. 14. FIG. 15 is an enlarged sectional view taken along the line BB in FIG. 14. FIG. FIG. 12 is a longitudinal cross-sectional view of the pen tip of FIG. 11 in a protruding state. FIG. 12 is an enlarged longitudinal cross-sectional view of the front shaft of FIG. 11; FIG. 12 is an enlarged front view of the intermediate shaft in FIG. 11; (a) is a cross-sectional view taken along line CC in FIG. 19, (b) is a cross-sectional view taken along line DD in FIG. 19, (c) is a cross-sectional view taken along line E-E in FIG. 19, and (d) is a cross-sectional view taken along line F in FIG. -F line sectional view. FIG. 12 is an enlarged vertical cross-sectional view of the intermediate shaft in FIG. 11; 12 is an enlarged front view of the rear shaft of FIG. 11. FIG. 23 is a sectional view taken along line GG in FIG. 22. FIG. FIG. 11 is an enlarged longitudinal cross-sectional view of the rear shaft of FIG. 11; FIG. 12 is an enlarged longitudinal cross-sectional view showing the attachment state of the rear shaft and the friction part of FIG. 11; FIG. 12 is an enlarged front view of main parts with the clip body of FIG. 11 omitted. FIG. 12 is an enlarged vertical cross-sectional view of the clip body of FIG. 11; FIG. 12 is an enlarged side view of the main part of the clip body of FIG. 11 excluding the cylindrical body. 12 is an enlarged front view of the cylindrical body of the clip body of FIG. 11. FIG. 12 is an enlarged plan view of the cylindrical body of the clip body of FIG. 11. FIG. FIG. 12 is an enlarged vertical cross-sectional view of the cylindrical body of the clip body of FIG. 11; 12 is an enlarged front view of the rotating member of FIG. 11. FIG. FIG. 12 is an enlarged vertical cross-sectional view of the rotating member of FIG. 11; 12 is an exploded view showing the main parts of the clip body, the cylindrical body, the rotating member, the intermediate shaft, and the rear shaft of FIG. 11. FIG. FIG. 17 is an enlarged vertical cross-sectional view of a main part of the pen tip in FIG. 11 in a protruding state (FIG. 17).

<First embodiment>
Embodiments of the present invention are shown in FIGS. 1 and 9. The thermochromic writing instrument 1 of the present embodiment includes a barrel 2, a writing body 9 housed in the barrel 2, and a pen tip of the writing body 9 that can freely protrude and retract from a front end hole 31 of the barrel 2. and a retractable mechanism.

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

The pen nib 91 may be configured, for example, only by a metal ballpoint tip with a ball rotatably held at the front end, or by a synthetic resin nib holder holding the rear outer surface of the ballpoint pen tip. It may be. Further, a tail plug is attached to the rear end opening of the ink storage tube 92, which has a vent hole that allows ventilation between the ink storage tube 92 and the outside. A spring that presses the ball at the front end forward is housed inside the pen tip 91. The spring has a configuration including a rod portion at the front end 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 forward bias of the spring brings the ball into close contact with the inner surface of the inward front edge of the front end of the ballpoint pen tip, thereby preventing ink leakage from the front end of the nib 91 and ink evaporation.

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

FIG. 5 shows the front axle 3. The front shaft 3 includes a tapered cylindrical main body 3a made of a molded body of synthetic resin (for example, polycarbonate resin), and a grip part 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 diameter of the rear end portion of the front shaft 3 is reduced, and a male screw portion 32 is formed on the outer surface thereof. A front end hole 31 is provided through 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 made of a cylindrical molded body of synthetic resin (for example, polycarbonate resin). A female threaded portion 46 is formed on the inner surface of the front end portion of the intermediate shaft 4 . The male threaded portion 32 of the front shaft 3 can be screwed into the female threaded 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 elongated hole 44 extending in the front-rear direction and having a closed front end and an open rear end. Furthermore, an outward protrusion 45 is integrally formed on the outer surface of the reduced diameter portion 43 . A stepped 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 elongated hole 44 of the intermediate shaft 4). Further, the stepped 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 elongated hole 44 (that is, between the cam portion 41 and the first elongated hole 44). Ru. Further, a locking protrusion 47 is integrally formed on the outer surface of the intermediate shaft 4. When the pen tip is retracted, an object such as a pocket can be held between the locking protrusion 47 and the ball portion 71a of the clip body 7.

FIG. 7 shows the rear axle 5. The rear shaft 5 is made of a cylindrical molded body of synthetic resin (for example, polycarbonate resin). A second elongated hole 51 extending in the front-rear direction is formed in the side wall of the front end of the rear shaft 5 and has an open front end and a closed rear end. Furthermore, a mounting hole 52 is provided at 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 portion 10 is fixed to the outer surface of the rear end of the rear shaft 5. Furthermore, an inward protrusion 53 is integrally formed on the inner surface of the rear shaft 5. The width dimension of the second elongated hole 51 is set equal to the width dimension of the first elongated hole 44, thereby allowing smooth movement of the clip body 7 in the front-rear direction along the slide hole 21. .

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

- Assembly of clip body Assembly of the clip body 7 will be explained. The base 72 of the clip body 7 is inserted into the first long hole 44 through the open rear end portion of the first long 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 intermediate shaft 5 so that the first elongated hole 44 of the intermediate shaft 4 and the second elongated hole 51 of the rear shaft 5 communicate with each other in the radial direction (so that they overlap in the radial direction). While fitting into the outer surface of the reduced diameter portion 43 of the shaft 4, the base portion 72 of the clip body 7 is inserted into the second elongated hole 51 from the open front end portion of the second elongated hole 51. Thereby, the intermediate shaft 4 and the rear shaft 5 are connected, and the first elongated hole 44 and the second elongated hole 51 form a slide hole 21 extending in the front-rear direction. A clip body 7 (a portion of the clip body 71 and the base 72) is projected radially outward from 21, and the clip body 7 is slidable in the front-back direction along the slide hole 21 (slidable in the front-back direction). configured. At this time, the outward protrusion 45 on the outer surface of the reduced diameter portion 43 of the intermediate shaft 4 and the inward protrusion 53 on the inner surface of the rear shaft 5 are engaged with each other.

By connecting the rear shaft 5 to which the friction part 10 is fixed to the rear end of the intermediate shaft 4, the friction part 10 is always fixed to the rear end of the shaft cylinder 2. Further, the front shaft 3 and the intermediate shaft 4 are removably connected by screwing together, thereby making the writing body 9 replaceable.

- Retractable and retractable mechanism The retractable and retractable mechanism is a side slide type retractable mechanism that uses a rotating cam mechanism. The protrusion/retraction 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 abuts the rear end of the writing body 9, and a rotating member 6 that engages with the rotating member 6. It consists of a clip body 7 that protrudes radially outward from the slide hole 21, and an elastic body 8 (for example, a compression coil spring) that is housed in the barrel 2 and biases the writing body 9 rearward. The projecting/retracting mechanism of this embodiment is of a double-knock type in which the clip body 7 is slid forward for both the pen tip protrusion operation and the pen tip retraction operation. The rotating member 6 is obtained from a molded body of synthetic resin (for example, polyacetal resin).

The cam portion 41 includes a plurality of serrated cam teeth 41a projecting 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 has a plurality of (for example, four) protrusions 61 extending in the front-rear direction on its outer surface, and the protrusions 61 engage with the cam teeth 41a of the cam portion 41 and the cam grooves 41b of the cam portion 41. will be 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 .

- Protrusion and retraction of the pen tip When the clip body 7 is slid forward from the pen tip retracted state against the backward bias by the resilient 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 protrusion 61 of the rotary member 6 moves forward along the cam groove 41b, the rotary member 6 presses the rear end of the writing body 9 forward, and the pen tip 91 enters the front end hole. 31 to the outside. At this time, the rotating member 6 rotates by a certain angle with respect to the cam portion 41 due to the contact between the cam teeth 73a 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 is maintained in a protruding state.

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 Due to this contact, the rotating member 6 rotates by a certain angle with respect to the cam portion 41. As a result, the engagement state between the protrusion 61 and the cam teeth 41a of the cam portion 41 is released, and the protrusion 61 moves backward along the cam groove 41b of the cam portion 41 due to the backward bias by the resilient body 8. Move to. As the rotary member 6 moves rearward, the writing body 9 moves rearward and enters the pen tip recessed 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 portion 10 is provided independently of the clip body 7.

- Other Examples of Clip Body FIG. 9 shows another embodiment of the clip body 7. The difference from the clip body 7 of this embodiment shown in FIG. 8 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 effects are shown in FIGS. Since this embodiment is similar to the embodiment No. 8, a description thereof will be omitted. The cylindrical body 74 is obtained by molding a synthetic resin (for example, polyacetal resin).

-Frictional part In the present embodiment, the elastic material constituting the frictional part 10 is preferably an elastic synthetic resin (rubber, elastomer), such as silicone resin or SBS resin (styrene-butadiene-styrene copolymer). , SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluororesin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM), and the like. The synthetic resin having elasticity constituting the friction part 10 is made of a low-wear elastic material that hardly generates wear scum (erasing scum) during friction, rather than a high-wear elastic material (such as an eraser). It is preferable to consist of. Further, the friction part 10 may be provided at least on the outer surface of the rear end of the shaft cylinder 2. For example, the friction part 10 made of an elastic material may be provided on the outer surface of the rear end of the shaft cylinder 2 or the rear end of the rear shaft 5. Examples include a configuration in which the shaft is fixed by press-fitting, engagement, screwing, fitting, adhesion, two-color molding, etc., 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 this embodiment, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat-erasable type that erases the color by heating from a colored state, a color memory retention type that tautonically stores and retains the colored state or the erased state within a specific temperature range, or a color-retaining type that erases the color from the colored state by heating. Various types can be used alone or in combination, such as a heated coloring type that develops color when heated and returns to a decolorized state by cooling from the colored state.

The coloring material contained in the reversible thermochromic ink is a conventionally known (a) electron-donating color-forming organic compound, (b) an electron-accepting compound, and (c) a color-forming reaction between the two. A reversible thermochromic pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium that determines the temperature at which the reaction occurs is encapsulated in microcapsules is preferably used.

In this embodiment, as shown in FIG. 10, the shape of the curve plotting the change in coloring density due to temperature change is different from when the temperature is increased from lower than the discoloration temperature range to when the temperature is increased from lower than the discoloration temperature range. The color changes by following different paths depending on when it is lowered from the side, and the color develops in a low temperature range below the complete color development temperature (t ₁ ) or discolors in a high temperature range above the complete color discoloration temperature (t ₄ ). It is preferable to use a color memory retention type thermochromic ink that can retain its state in a specific temperature range [temperature range between t ₂ and t ₃ (substantially two-phase retention temperature range)]. In FIG. 10, ΔH indicates a temperature width indicating the degree of hysteresis (ie, hysteresis width). If 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, each state before and after discoloration can be easily maintained.

In this embodiment, the temperature at which the thermochromic ink changes color due to the frictional heat of the friction portion 10 is set at 25° C. to 95° C. (preferably 36° C. to 95° C.). That is, in this embodiment, the high temperature side discoloration point [complete discoloration temperature (t ₄ )] is set in the range of 25°C to 95°C (preferably 36°C to 90°C), and the low temperature side discoloration point It is effective to set the point [complete color development temperature (t ₁ )] in the range of -30°C to +20°C (preferably -30°C to +10°C). Thereby, it is possible to effectively maintain the color exhibited under normal conditions (in the daily life temperature range), and the handwriting made with the reversible thermochromic ink can be easily changed in color by the frictional heat generated by the friction section 10.

In the thermochromic writing instrument 1 of the present embodiment, the friction part 10 is fixed to the outer surface of the rear end of the barrel 2, so that the friction part 10 is prevented from moving backward during friction operation. 10 enables stable frictional operation. In addition, the thermochromic writing instrument 1 of the present embodiment has an operating section for operating the pen tip to appear and retract on the clip body 7, and the friction section 10 is made independent from the clip body 7 (operating section). When the pen tip 91 is moved in and out, the clip body 7 is operated and the friction part 10 is not operated, so that the friction part 10 can be prevented from becoming dirty with dirt from the hands or the like. Furthermore, although the thermochromic writing instrument 1 of the present embodiment has the clip body 7 on the outer surface of the barrel 2, the protruding portion is smaller than that of the conventional multi-core type side-sliding thermochromic writing instrument. This increases the degree of freedom in external design and allows for a smart appearance.

The thermochromic writing instrument 1 of this embodiment has a side-sliding mechanism that uses a rotating cam mechanism, and both the pen tip protrusion operation and the pen tip retraction operation cause the clip body 7 to slide forward. Since it is an operated type (a so-called double-knock type retraction mechanism), the operation method is simple and the user can easily learn how to operate it.

The thermochromic writing instrument 1 of this embodiment has the intermediate shaft 4 by forming the slide hole 21 with the first elongated hole 44 opened to the rear and the second elongated hole 51 opened to the front. When connecting the rear shaft 5 and the rear shaft 5 (that is, when forming the slide hole 21), the clip body 7 can be inserted into the first elongated hole 44 and the second elongated hole 51, and the clip body 7 can be inserted into the slide hole 44 and the second elongated hole 51. 21, and 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 51 in the radial direction, it is possible to prevent the entire shaft cylinder 2 from becoming unnecessarily long.

In the thermochromic writing instrument 1 of the present embodiment, the friction part 10 is made of an elastic material, and a part of the friction part 10 comes into contact with the clip body 7 in which the pen tip is in the recessed state, so that the pen tip is in the protruding state. When the pen tip is brought into the retracted state, the writing body 9 and the clip body 7 move backward due to the backward bias of the resilient body 8, and the clip body 7 and the friction part 10 made of an elastic material come into contact with each other. The impact applied to the cursive 9 can be alleviated. As a result, backflow of ink within the writing body 9 and mixing of air from the pen tip 91 can be prevented.

<Second embodiment>
A second embodiment of the present invention is shown in FIGS. 11 to 35. The thermochromic writing instrument 1 of the present embodiment includes a barrel 2, a writing body 9 housed in the barrel 2, and a pen tip 91 of the writing body 9 that can be freely retracted from the front end hole 31 of the barrel 2. It is equipped with a mechanism that makes it appear and disappear.

- Cursive The writing 9 includes a pen nib 91, an ink storage tube 92 in which the pen nib 91 is press-fitted into the front end opening, and a thermochromic ink 93 filled in the ink storage tube 92. It consists of a follower 94 (for example, a high viscosity fluid) that is filled at the rear end of the thermochromic ink 93 and moves forward as the thermochromic ink 93 is consumed.

The pen nib 91 may be configured, for example, only by a metal ballpoint tip with a ball rotatably held at the front end, or by a synthetic resin nib holder holding the rear outer surface of the ballpoint pen tip. It may be. Further, a tail plug 95 is attached to the rear end opening of the ink storage tube 92, which has a vent hole that allows ventilation between the ink storage tube 92 and the outside. A spring that presses the ball at the front end forward is housed inside the pen tip 91. The spring includes a rod portion at the front end 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 forward bias of the spring brings the ball into close contact with the inner surface of the inward front edge of the front end of the ballpoint pen tip, thereby preventing ink leakage from the front end of the nib 91 and ink evaporation.

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

FIG. 18 shows the front axle 3. The front shaft 3 includes a tapered cylindrical main body 3a made of a molded body of synthetic resin (for example, polycarbonate resin), and a grip part 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 by attachment to the outer surface of the main body 3a. The diameter of the rear end portion of the front shaft 3 is reduced, and a male screw portion 32 is formed on the outer surface thereof. A front end hole 31 is provided through the front end of the front shaft 3 in the front-rear direction.

The intermediate shaft 4 is shown in FIGS. 19 to 21. The intermediate shaft 4 is made of a cylindrical molded body of synthetic resin (for example, polycarbonate resin). A female threaded portion 46 is formed on the inner surface of the front end portion of the intermediate shaft 4 . The male threaded portion 32 of the front shaft 3 can be screwed into the female threaded portion 46 . A reduced diameter portion 43 is integrally formed at the rear end portion of the intermediate shaft 4 . A first elongated hole 44 extending in the front-rear direction is formed in the side wall of the rear end of the intermediate shaft 4 and has a closed front end and an open rear end. Furthermore, an outward protrusion 45 is integrally formed on the outer surface of the reduced diameter portion 43 . A stepped 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 elongated hole 44 is located slightly forward of the step portion (that is, the rear end of the cam portion 41) and rearward of the cam teeth 41a of the cam portion 41. . Furthermore, 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 elongated hole 44 . The ball portion 71a of the clip body 7 is always engaged with the guide groove 48, and as the clip body 7 moves in the front-rear direction, the ball portion 71a of the clip body 7 moves in the front-rear direction along the guide groove 48. It is movable. An object to be held, such as a pocket, is firmly held by the guide groove 48 and the ball portion 71a.

The rear shaft 5 is shown in FIGS. 22 to 25. The rear shaft 5 is made of a cylindrical molded body of synthetic resin (for example, polycarbonate resin). A second elongated hole 51 extending in the front-rear direction is formed in the side wall of the front end of the rear shaft 5 and has an open front end and a closed rear end. Furthermore, a mounting hole 52 is provided at 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 portion 10 is fixed to the outer surface of the rear end of the rear shaft 5. Furthermore, an inward protrusion 53 is integrally formed on the inner surface of the rear shaft 5. The width dimension of the second elongated hole 51 is set equal to the width dimension of the first elongated hole 44, thereby allowing smooth movement of the clip body 7 in the front-rear direction along the slide hole 21. .

FIG. 28 shows the clip body 7. The clip body 7 includes a clip body 71 extending in the front-rear direction, a base 72 integrally connected to the rear part of the clip body 71, and a shaft part 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 portion 7a of the clip body 7 is obtained from a molded body of synthetic resin (for example, polycarbonate resin). A plate-shaped ball portion 71a is integrally provided on the back surface (inner surface) of the clip body 71 in a protruding manner.

The shaft portion 73 consists of a large diameter portion 73b and a small diameter portion 73c which is connected to the front of the large diameter portion 73b and has an outer diameter smaller than that of the large diameter portion 73b. A first outward protrusion 73d is integrally formed on the outer surface of the large diameter portion 73b, and a second outward protrusion 73e is integrally formed on the outer surface of the small diameter portion 73c. The first outward protrusion 73d and the second outward protrusion 73e may be, for example, an annular protrusion or a plurality of dispersed protrusions distributed circumferentially.

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

The cylindrical body 74 is shown in FIGS. 29 to 31. The cylindrical body 74 is attached to the outer surface of the shaft portion 73 of the clip body 7. Cam teeth 74a are formed at the front end of the cylindrical body 74. An inner hole passes through the cylindrical body 74 in the front-rear direction, and an inward protrusion 74b is integrally formed on the inner surface of the inner hole. The cylindrical body 74 rides over and engages with the first outward protrusion 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 become integrally movable 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 engage movably in the front-rear direction along the cam groove 41b of the cam portion 41, whereby the shaft Rotation of the cylindrical body 74 within the cylinder 2 is prevented. The cylindrical body 74 is obtained by molding a synthetic resin (for example, polyacetal resin).

The rotating member 6 is shown in FIGS. 32 and 33. The rotating member 6 has a plurality of (for example, four) protrusions 61 extending in the front-rear direction on its outer surface, and the protrusions 61 engage with the cam teeth 41a of the cam portion 41 and the cam grooves 41b of the cam portion 41. will be combined. An inner hole penetrating in the front-rear direction is formed inside the rotating member 6. An inward protrusion 62 is formed on the inner surface of the inner hole of the rotary member 6 . The rotating member 6 is obtained from a molded body of synthetic resin (for example, polyacetal resin).

FIG. 35 shows the engaged state of the clip body 7 and the rotating member 6 in the pen tip protruding state. The inward protrusion 62 of the rotating member 6 crosses 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. Further, the rotating member 6 has play in the front and rear direction and is rotatably attached. The back-and-forth play (moveable amount) is set to a small size that allows engagement and disengagement between the protrusion 61 of the rotating member 6 and the cam teeth 41a of the cam portion 41.

- Assembly of clip body Assembly of the clip body 7 will be explained. The base 72 of the clip body 7 is inserted into the first long hole 44 from the rear end open portion of the first long hole 44 of the intermediate shaft 4, and the cylindrical shaft portion 73 of the clip body 7 is inserted into the intermediate shaft 4. Insert into shaft 4. Thereafter, the inner surface of the rear shaft 5 is connected to the intermediate shaft 5 so that the first elongated hole 44 of the intermediate shaft 4 and the second elongated hole 51 of the rear shaft 5 communicate with each other in the radial direction (so that they overlap in the radial direction). While fitting into the outer surface of the reduced diameter portion 43 of the shaft 4, the base portion 72 of the clip body 7 is inserted into the second elongated hole 51 from the open front end portion of the second elongated hole 51. Thereby, the intermediate shaft 4 and the rear shaft 5 are connected, and the first elongated hole 44 and the second elongated hole 51 form a slide hole 21 extending in the front-rear direction. A clip body 7 (a portion of the clip body 71 and the base 72) is projected radially outward from 21, and the clip body 7 is slidable in the front-back direction along the slide hole 21 (slidable in the front-back direction). configured. At this time, the outward protrusion 45 on the outer surface of the reduced diameter portion 43 of the intermediate shaft 4 and the inward protrusion 53 on the inner surface of the rear shaft 5 are engaged with each other.

By connecting the rear shaft 5 to which the friction part 10 is fixed to the rear end of the intermediate shaft 4, the friction part 10 is always fixed to the rear end of the shaft cylinder 2. Further, the front shaft 3 and the intermediate shaft 4 are removably connected by screwing together, thereby making the writing body 9 replaceable.

- Retractable and retractable mechanism The retractable and retractable mechanism is a side slide type retractable mechanism that uses a rotating cam mechanism. The protrusion/retraction 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 abuts the rear end of the writing body 9, and a rotating member 6 that engages with the rotating member 6. It consists of a clip body 7 that protrudes radially outward from the slide hole 21, and an elastic body 8 (for example, a compression coil spring) that is housed in the barrel 2 and biases the writing body 9 rearward. The projecting/retracting mechanism of this embodiment is of a double-knock type in which the clip body 7 is slid forward for both the pen tip protrusion operation and the pen tip retraction operation.

The cam portion 41 includes a plurality of serrated cam teeth 41a projecting 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 has a plurality of (for example, four) protrusions 61 extending in the longitudinal direction on its outer surface, and the protrusions 61 engage with the cam teeth 41a of the cam portion 41 and the cam grooves 41b of the cam portion 41. will be combined. Cam teeth 74a 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.

- Protrusion and retraction of the pen tip When the clip body 7 is slid forward from the pen tip retracted state against the backward bias by the rebound body 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 rotary member 6 moves forward along the cam groove 41b, the rotary member 6 presses the rear end of the writing body 9 forward, and the pen tip 91 is projected to the outside from the front end hole 31. At this time, the cam teeth 74a of the cylindrical body 74 attached to the shaft portion 73 come into contact with the protrusions 61 of the rotary member 6, so that the rotary member 6 rotates by a certain angle with respect to the cam portion 41. 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 is maintained in a protruding state.

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 Due to the contact of the member 6 with the protrusion 61, the rotating member 6 rotates by a certain angle with respect to the cam portion 41. As a result, the engagement state between the protrusion 61 and the cam teeth 41a of the cam portion 41 is released, and the protrusion 61 moves backward along the cam groove 41b of the cam portion 41 due to the backward bias by the resilient body 8. Move to. As the rotary member 6 moves rearward, the writing body 9 moves rearward and enters the pen tip recessed state.

-Frictional part In the present embodiment, the elastic material constituting the frictional part 10 is preferably an elastic synthetic resin (rubber, elastomer), such as silicone resin or SBS resin (styrene-butadiene-styrene copolymer). , SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluororesin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM), and the like. The synthetic resin having elasticity constituting the friction part 10 is made of a low-wear elastic material that hardly generates wear scum (erasing scum) during friction, rather than a high-wear elastic material (such as an eraser). It is preferable to consist of. Further, the friction part 10 may be provided at least on the outer surface of the rear end of the shaft cylinder 2. For example, the friction part 10 made of an elastic material may be press-fitted into the rear end of the shaft cylinder 2 or the rear end of the rear shaft 5. , a configuration in which the shaft is fixed by engagement, screwing, fitting, adhesion, two-color molding, etc., 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 this embodiment, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat-erasable type that erases the color by heating from a colored state, a color memory retention type that tautonically stores and retains the colored state or the erased state within a specific temperature range, or a color-retaining type that erases the color from the colored state by heating. Various types can be used alone or in combination, such as a heated coloring type that develops color when heated and returns to a decolorized state by cooling from the colored state.

The coloring material contained in the reversible thermochromic ink is a conventionally known (a) electron-donating color-forming organic compound, (b) an electron-accepting compound, and (c) a color-forming reaction between the two. A reversible thermochromic pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium that determines the temperature at which the reaction occurs is encapsulated in microcapsules is preferably used.

In this embodiment, as shown in FIG. 10, the shape of the curve plotting the change in color density due to temperature change is different from when the temperature is increased from lower than the discoloration temperature range to when the temperature is increased from lower than the discoloration temperature range. The color changes following different paths depending on when it is lowered from the side, and the color develops in a low temperature range below the complete color development temperature (t ₁ ) or discolors in a high temperature range above the complete color discoloration temperature (t ₄ ). It is preferable to use a color memory retention type thermochromic ink that can retain its state in a specific temperature range [temperature range between t ₂ and t ₃ (substantially two-phase retention temperature range)]. In FIG. 10, ΔH indicates a temperature width indicating the degree of hysteresis (ie, hysteresis width). If 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, each state before and after discoloration can be easily maintained.

In this embodiment, the temperature at which the thermochromic ink changes color due to the frictional heat of the friction portion 10 is set at 25° C. to 95° C. (preferably 36° C. to 95° C.). That is, in this embodiment, the high temperature side discoloration point [complete discoloration temperature (t ₄ )] is set in the range of 25°C to 95°C (preferably 36°C to 90°C), and the low temperature side discoloration point It is effective to set the point [complete color development temperature (t ₁ )] in the range of -30°C to +20°C (preferably -30°C to +10°C). Thereby, it is possible to effectively maintain the color exhibited under normal conditions (in the daily life temperature range), and the handwriting made with the reversible thermochromic ink can be easily changed in color by the frictional heat generated by the friction section 10.

In the thermochromic writing instrument 1 of the present embodiment, the friction part 10 is fixed to the outer surface of the rear end of the barrel 2, so that the friction part 10 is prevented from moving backward during friction operation. 10 enables stable frictional operation. In addition, the thermochromic writing instrument 1 of the present embodiment has an operating section for operating the pen tip to appear and retract on the clip body 7, and the friction section 10 is made independent from the clip body 7 (operating section). When the pen tip 91 is moved in and out, the clip body 7 is operated and the friction part 10 is not operated, so that the friction part 10 can be prevented from becoming dirty with dirt from the hands or the like. Furthermore, although the thermochromic writing instrument 1 of the present embodiment has the clip body 7 on the outer surface of the barrel 2, the protruding portion is smaller than that of the conventional multi-core type side-sliding thermochromic writing instrument. This increases the degree of freedom in external design and allows for a smart appearance.

The thermochromic writing instrument 1 of this embodiment has a side-sliding mechanism that uses a rotating cam mechanism, and both the pen tip protrusion operation and the pen tip retraction operation cause the clip body 7 to slide forward. Since it is an operated type (a so-called double-knock type retraction mechanism), the operation method is simple and the user can easily learn how to operate it.

The thermochromic writing instrument 1 of this embodiment has the intermediate shaft 4 by forming the slide hole 21 with the first elongated hole 44 opened to the rear and the second elongated hole 51 opened to the front. When connecting the rear shaft 5 and the rear shaft 5 (that is, when forming the slide hole 21), the clip body 7 can be inserted into the first elongated hole 44 and the second elongated hole 51, and the clip body 7 can be inserted into the slide hole 44 and the second elongated hole 51. 21, and 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 51 in the radial direction, it is possible to prevent the entire shaft cylinder 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 housed in the shaft tube 2 and extends in the front-rear direction, and the shaft portion 73 and the rotating member 6 are connected to each other. By being mutually rotatable and locked in the front-rear direction with a back-and-forth play, the clip body 7 is prevented from moving inadvertently in the front-rear direction when the pen tip is protruding. As a result, even if the user grips the vicinity of the clip body 7 with the pen tip protruding, stable frictional operation is possible.

The thermochromic writing instrument 1 of this embodiment has a guide groove 48 extending in the front-rear direction formed on the outer surface of the shaft tube 2 in front of the slide hole 21, and a ball portion 71a on the inner surface of the front portion of the clip body 7. As the clip body 7 moves in the front-back direction, the ball portion 71a slides in the guide groove 48 in the front-rear direction, thereby improving the clip clamping performance and improving the lateral movement of the clip body 7. Wobble in the direction (circumferential direction) can be prevented.

In the thermochromic writing instrument 1 of this embodiment, the frictional part 10 is made of an elastic material, and a part of the frictional part 10 can be brought into contact with the clip body 7 in which the pen tip is retracted. As a result, when the pen tip is changed from the protruding state to the pen tip retracting state, the writing body 9 and the clip body 7 move backward due to the backward bias of the resilient body 8, and the clip body 7 and the friction part 10 made of an elastic material are brought into contact with each other. Since they come into contact with each other, the impact applied to the writing body 9 at that time can be alleviated. As a result, it is possible to prevent the backflow of ink within the writing body 9 and the mixing of air from the pen tip 91.

1 Thermochromic writing instrument 2 Barrel 21 Slide hole 3 Front shaft 31 Front end hole 32 Male screw portion 3a Main body 3b Grip portion 4 Intermediate shaft 41 Cam portion 41a Cam tooth 41b Cam groove 42 Step portion 43 Reduced diameter portion 44 First long hole 45 Outward protrusion 46 Female thread part 47 Locking protrusion 48 Guide groove 49 Groove 5 Rear shaft 51 Second long hole 52 Mounting hole 53 Inward protrusion 6 Rotating member 61 Projection 62 Inward protrusion 7 Clip body 71 Clip body 71a Ball part 72 Base 72a Rib 73 Shaft portion 73a Cam tooth 73b Large diameter portion 73c Small diameter portion 73d First outward projection 73e Second outward projection 74 Cylindrical body 74a Cam tooth 74b Inward projection 74c Guide projection 7a Main portion 8 Elastic body 9 Cursive writing 91 Pen nib 92 Ink storage tube 93 Thermochromic ink 94 Follower 95 Tail plug 10 Friction part

Claims (19)

A writing body containing thermochromic ink is housed in a barrel, and the operating body provided on the barrel is operated to move the writing body in the front and back direction, and the pen tip of the writing body is moved into the writing instrument. A thermochromic writing instrument configured to be removable from the tip,
A friction part capable of rubbing the handwriting of the thermochromic ink and thermally discoloring the handwriting with the frictional heat generated at that time, and a clip body as at least one of the operating bodies, the friction part being connected to the shaft cylinder. A thermochromic writing instrument, characterized in that the clip body is provided at a rear end and at a portion of the barrel other than the rear end. The thermal device according to claim 1, wherein the operating body includes only a single clip body, and by operating the single clip body, the pen tip of the cursive writing body can be brought into a protruding state and a retracted state. Color-changing writing instruments. A slide hole extending in the front-rear direction is provided in the side wall of the barrel, and the clip body disposed in the slide hole is slid forward to move the pen tip of the cursive writing from a recessed state to a protruding state. The thermochromic writing instrument according to claim 1 or 2, comprising: The shaft tube is made up of two or more parts that can be connected to each other, and each side wall of the two parts constituting the shaft tube has a first or second length that is open at a front end or a rear end and extends in the front-rear direction. 4. The thermochromic writing instrument according to claim 3, wherein holes are provided respectively, and when the two parts are connected, the first and second elongated holes communicate with each other to form the slide hole. 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 communicate with each other while overlapping each other in the radial direction to form the slide hole. 5. The thermochromic writing instrument according to claim 4, which forms a thermochromic writing instrument. inserting the base of the clip body into the first elongated hole provided in one of the parts constituting the shaft cylinder;
While inserting the base of the clip body into the second elongated hole provided in the other component constituting the shaft cylinder, connect the other component to the one component, and insert the second elongated hole into the second elongated hole. forming the slide hole in communication with the first long hole;
6. The thermochromic writing instrument according to claim 4, wherein the clip body is assembled into the slide hole through steps. A cam mechanism serving as the protruding and retracting mechanism is provided in the shaft cylinder, and the cam mechanism includes cam portions and protrusions that can be engaged alternately at different positions in the front and back direction, and the clip body is slid forward. According to any one of claims 3 to 6, the cam portion and the protrusion are alternately engaged at different positions in the front-rear direction, and the pen tip of the writing body is alternately brought into a protruding state or a retracted state. Thermochromic writing instrument. The retracting mechanism includes a plurality of cam teeth and cam grooves extending in the front-rear direction and arranged alternately along the circumferential direction, and a plurality of cam teeth and cam grooves arranged rotatably behind the writing body and alternately arranged in the cam teeth or the cam grooves. a rotating member having a plurality of protrusions that can be engaged with the clip; a plurality of other cam teeth that are provided on the clip body and rotate the rotating member; and an elastic body that urges the writing body backward. , in the shaft cylinder,
By sliding the clip body forward against the biasing 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 engaged with the cam teeth or the cam grooves. 8. The thermochromic writing instrument according to claim 7, which is in a protruding state or a recessed state. 9. The clip body has a shaft part housed in the shaft cylinder and extending in the front-rear direction, and the shaft part and the rotating member are locked to each other with 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 provided protrudingly on the front inner surface of the clip body, and as the clip body moves in the front-rear direction, The thermochromic writing instrument according to any one of claims 3 to 9, wherein the ball portion slides within the guide groove in the front-rear direction. The thermochromic writing instrument according to any one of claims 1 to 10, wherein the frictional part is made of an elastic material, and a part of the frictional part is in contact with a clip body in which the pen tip is recessed. The friction part is made of an elastic material and is fixed to the rear end of the barrel by press-fitting, engaging, screwing, fitting, adhering, or two-color molding, or the entire barrel is made of an elastic material as the friction part. The thermochromic writing instrument according to any one of claims 1 to 11, formed of a material. A thermochromic ink is stored inside a writing body, a pen tip capable of discharging the thermochromic ink is provided at the front end of the writing body, and the writing body is pushed back and forth in a barrel. A thermochromic writing instrument that is housed movably in the direction, and configured such that the pen tip of the writing body can come out and go out from the front end hole of the barrel,
A slide hole extending in the front-rear direction is provided in a side wall of the barrel, a clip body projects 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 retracting mechanism that causes the pen tip to protrude from the front end hole of the barrel by sliding the clip body forward from the tip retracted state, and causes the pen tip to enter the retracted state by operating the clip body from the pen tip protruding state. A thermochromic writing instrument, characterized in that the rear end of the barrel is provided with a friction portion capable of rubbing the handwriting of the thermochromic ink and thermally discoloring the handwriting with the frictional heat generated at that time. The ejection and retraction mechanism is a side slide type ejection and retraction mechanism using a rotating cam mechanism, and includes 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 abuts the rear end of the writing body. , a clip body having cam teeth that engages with the rotating member, and an elastic body that is housed in the barrel and urges the writing body backward, and is capable of pen tip protrusion operation and pen tip retraction operation. 14. The thermochromic writing instrument according to claim 13, wherein each of the two is of a type in which the clip body is slid forward. The barrel includes a front shaft, an intermediate shaft connected to the rear end of the front shaft, and a rear shaft connected to the rear end of the intermediate shaft, and a pen tip is provided at the front end of the front shaft. A retractable front end hole is provided, a cam portion is provided on the inner surface of the intermediate shaft, a first elongated hole that is open to the rear and extends in the front-rear direction is provided at the rear end of the intermediate shaft, and the front end of the rear shaft is A second elongated hole that is open to the front and extends in the front-rear direction is provided in the section, and the first elongated hole and the second elongated hole connect the rear end of the intermediate shaft and the front end of the rear shaft. Claim 13 or 14, wherein the sliding hole is formed in the side wall of the shaft cylinder by the first elongated hole and the second elongated hole, and a friction portion is provided at the rear end of the rear shaft. The thermochromic writing instrument described in . 16. The heat exchanger 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 elongated hole and the second elongated hole are communicated in the radial direction. Color-changing writing instruments. The clip body has a shaft portion that is housed in the shaft cylinder and extends in the front-rear direction, and the shaft portion and the rotating member are rotatable with respect to each other and have a play in the front-rear direction with respect to the front-rear direction. The thermochromic writing instrument according to any one of claims 13 to 16, wherein the thermochromic writing instrument 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 is provided protrudingly on the inner surface of the front part of the clip body, and as the clip body moves in the front-rear direction, the guide groove extends in the front-rear direction. 18. The thermochromic writing instrument according to any one of claims 13 to 17, wherein the ball portion slides in the front-rear direction within the guide groove. The thermochromic writing instrument according to any one of claims 13 to 18, wherein the frictional part is made of an elastic material, and a part of the frictional part is in contact with a clip body in which the pen tip is recessed.

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