WO2023276914A1

WO2023276914A1 - Knock-type writing instrument

Info

Publication number: WO2023276914A1
Application number: PCT/JP2022/025451
Authority: WO
Inventors: 孝洋鈴木
Original assignee: 株式会社パイロットコーポレーション
Priority date: 2021-06-30
Filing date: 2022-06-27
Publication date: 2023-01-05
Also published as: JPWO2023276914A1; CN117730005A; TW202317391A

Abstract

[Problem] To provide a knock-type writing instrument capable of easily and reliably attaching an operating body detached from a feeding mechanism of a writing body to the feeding mechanism. [Solution] The knock-type writing instrument is provided with: a shaft cylinder (2); a writing body (8) accommodated inside the shaft cylinder (2); a feeding mechanism (3) feeding the writing body (8) forward; and an operating body (4) arranged at the rear of the feeding mechanism (3). The knock-type writing instrument has a handwriting transforming member (5) attached in front of the operating body (4) and used to remove, thermally discolor, or hide handwriting written by means of the writing body (8). The operating body (4) at least partially protrudes from the shaft cylinder (2), and is attached to be slidable back and forth and detachable with respect to the shaft cylinder (2) by a magnetic force acting between the shaft cylinder (2) and the operating body (4).

Description

Retractable writing instrument

The present invention relates to an operating body mounting structure for a retractable writing instrument.

Conventionally, handwriting written with a writing instrument having a writing body is rubbed with a handwriting changing member housed in the writing instrument to remove the handwriting from the writing surface or thermally discolor the handwriting from colored to colored or from colored to colorless. , a writing instrument capable of adding variation to handwriting is known.

As an example of the above writing instrument, JP2011-230357A has an eraser that is detachably attached to the rear end opening of the barrel to expose an eraser that is a handwriting changing member, and a handwriting that is written with the eraser with a core. Disclosed is a knock-type mechanical pencil capable of removing handwriting from a writing surface by rubbing.

According to the knock type mechanical pencil of JP2011-230357A, a cylindrical cap protrudes from the rear end opening of the barrel, and an eraser is provided inside the cap. By operating the lead feeding mechanism, the lead is drawn out from the tip of the writing tip located in front of the barrel. The exposed handwriting can be removed by rubbing the handwriting written with the mechanical pencil with the eraser.

However, in the knock-type mechanical pencil of JP2011-230357A, the cap is detachably attached to the lead lead-out mechanism by press-fitting or locking so that the cap does not come off from the lead lead-out mechanism when writing or carrying. there is For this reason, when attaching the cap to the lead core feeding mechanism, there is a possibility that the lead core feeding mechanism is pushed forward and the lead core is unintentionally fed forward. In addition, if the attachment of the cap to the lead feeding mechanism stops halfway and is not firmly attached, the cap may come off when writing or carrying, and the cap may be damaged or lost, and the exposed eraser may become dirty. rice field.

The present invention has been made based on the above background, and its object is to easily and reliably reattach an operating body that has been removed from a barrel without causing any trouble in the delivery mechanism. To provide a knock-type writing instrument capable of

[1] The knock-type writing instrument of the present embodiment includes a barrel, a writing body that is housed inside the barrel and has a writing part at the tip, a feeding mechanism that feeds the writing body forward, and the manipulating mechanism. and an operating body that is arranged behind and operates the feeding mechanism,
a handwriting changing member that is locked in front of the operating body and that removes, heat discolors, or conceals handwriting written with the cursive body;
At least a portion of the operating body protrudes from the shaft cylinder, and the operating body is attached detachably and slidably back and forth with respect to the shaft cylinder by a magnetic force acting between the shaft cylinder and the operating body. It is a knock-type writing instrument characterized by

[2] The knock-type writing instrument of the present embodiment is characterized in that either one of the barrel or the operating body is provided with a magnet, and the other is provided with a ferromagnetic material that is magnetically attached by the magnetic force of the magnet. It is a knock-type writing instrument according to [1].

[3] In the knock-type writing instrument of the present embodiment, the manipulating mechanism is operated by operating the operating body, and when the distance between the magnet and the ferromagnetic material is maximized, The knock-type writing instrument according to [2], wherein the operation body returns to the position before operation only by the magnetic force acting therebetween.

[4] In the knock-type writing instrument of the present embodiment, when the operating body is removed from the barrel, the operating body can be detachably attached to the barrel by magnetic force even if the front-rear direction of the operating body is reversed. A knock-type writing instrument according to any one of [1] to [3].

[5] In the knock-type writing instrument of the present embodiment, when the operating body is attached to the shaft cylinder with the front and back reversed, the operating body comes into contact with the restricting portion that restricts the forward movement of the operating body. The knock-type writing instrument according to [4] characterized by

1 is a longitudinal end view of a knock-type writing instrument according to a first embodiment of the present invention; FIG. FIG. 2 is an enlarged end view showing the AA end face of FIG. 1; FIG. 2 is an exploded view showing a state in which the knock-type writing instrument of FIG. 1 is disassembled to explain the relationship between the operating body and the parts fixed to the operating body; 2 is a vertical cross-sectional view showing a state in which the chuck is advanced by operating the operation body in the knock-type writing instrument of FIG. 1. FIG. FIG. 2 is an explanatory diagram showing a state in which an operation body is removed from the knock-type writing instrument of FIG. 1; FIG. 6 is a vertical end view showing a state in which the operation body is remounted on the shaft cylinder with the front-rear direction reversed from the state in FIG. 5 ; FIG. 10 is a vertical end view of a retractable mechanical pencil according to a second embodiment of the present invention; 8 is an enlarged end view showing the BB end face of FIG. 7; FIG. FIG. 8 is an exploded view showing an exploded state of the swing-type mechanical pencil of FIG. 7 for explaining the relationship between the operation body and parts fixed to the operation body; FIG. 8 is a vertical cross-sectional view showing a state in which the chuck is advanced by operating the operation body in the swing-type mechanical pencil of FIG. 7 ; FIG. 8 is an explanatory diagram showing a state in which the operating body is removed from the swing-out mechanical pencil of FIG. 7; FIG. 12 is a vertical end view showing a state in which the operating body is remounted on the shaft cylinder with the front-rear direction reversed from the state in FIG. 11 ; FIG. 11 is a vertical cross-sectional view showing a non-use of the thermochromic writing instrument according to the third embodiment of the present invention; 14 is an enlarged end view taken along line CC of FIG. 13; FIG. FIG. 4 is an exploded view of a second operating body; FIG. 14 is a vertical cross-sectional view of the state in which the second operation body is advanced from the state in FIG. 13; FIG. 17 is a vertical end view of the third embodiment of the present invention when it is in use, and shows a state in which the second operating body is retracted from the state of FIG. 16; FIG. 14 is an explanatory diagram illustrating a state in which the second operating body is removed from the state in FIG. 13; FIG. 14 is a longitudinal end view showing a state in which the second operating body is removed from the state shown in FIG. 13 and attached with the second operating body reversed front to back;

Each embodiment of the present invention will be described below with reference to the drawings. In the drawings attached to this specification, for convenience of illustration and ease of understanding, the scale, length-to-width ratio, etc. may be changed and exaggerated from the actual ones.

As used herein, terms specifying shapes and geometric conditions as well as degrees thereof, such as "parallel", "perpendicular", "identical", length and angle values, etc., are strictly It shall be interpreted to include the extent to which similar functions can be expected without being bound.

In this specification, the direction in which the central axis of the

writing instrument

1, 101, 201 extends (longitudinal direction) is the axial direction or longitudinal direction, the direction orthogonal to the axial direction is the radial direction, and the direction along the circumference around the central axis. is the circumferential direction. In addition, along the axial direction, the side where the front end opening of the barrel (pen tip side) is expressed as the front side, and the opposite direction is expressed as the rear side. In addition, along the radial direction, the direction toward the axis (central axis) of the barrel is expressed as inner or inner, and the opposite direction is expressed as outer or outer.

(First embodiment)
The retractable writing instrument 1 of the first embodiment of the present invention is illustrated using a retractable mechanical pencil, but the present invention is not limited to this, and any retractable writing instrument can be widely used. .

1 is a vertical end view of a knock-type writing instrument according to a first embodiment of the present invention, FIG. 2 is an enlarged end view showing the AA end face of FIG. 1, and FIG. 3 is a knock-type writing instrument of FIG. FIG. 4 is an exploded view showing an exploded state in order to explain the relationship between an operation body and parts fixed to the operation body in the writing instrument; FIG. FIG. 5 is a vertical cross-sectional view showing a state in which the chuck is moved forward by pressing, FIG. 5 is an explanatory view showing a state in which the operating body is removed in the knock-type writing instrument of FIG. 1, and FIG. 6 is the state of FIG. 2 is a vertical end view showing a state in which the operation body is remounted on the shaft cylinder with the front-rear direction reversed from FIG.

As shown in FIGS. 1 and 2, the mechanical pencil 1 includes a barrel 2 and a chuck 31 which is disposed inside the barrel 2 and holds a writing lead 8 made of a lead that serves as a writing body. It is composed of a delivery mechanism 3 and an operation body 4 which is detachably attached to the barrel 2 behind the delivery mechanism 3 and protrudes rearward from a rear end opening 2 c of the barrel 2 .

The barrel 2 includes a tapered cylindrical tip 23, a cylindrical front shaft 21 screwed to the rear of the tip 23, and a cylindrical rear shaft 22 screwed to the rear of the front shaft 21. , and an inner hole penetrating in the front-rear direction is formed inside the barrel 2 . A grip 2a made of elastomer is integrally formed on the outer peripheral portion of the barrel 2 (front barrel 21) by two-color molding.

A lead holding member 24 for holding the writing lead 8 with a light force is fixed to the front inner peripheral portion of the barrel 2 (tip 23) by press-fitting or overfitting. is formed with a front end opening 2b through which the writing lead 8 protrudes.

A rear end opening 2c is formed at the rear end of the barrel 2 (the rear end of the rear shaft 22). A cylindrical body 7 made of a ferromagnetic material is press-fitted or over-fitted into the rear end opening 2c. Thereby, the cylindrical body 7 is fixed to the barrel 2, and the mounting opening 9 formed by the cylindrical body 7 and the inner peripheral portion of the rear barrel 22 is formed. An operating body 4, which will be described later, is slidably and detachably mounted in the mounting opening 9. As shown in FIG. In addition, an inner stepped restricting portion 2d protruding inward is formed on the inner peripheral portion of the barrel 2 (rear shaft 22).

The lead feeding mechanism 3 includes a chuck 31 that holds the writing lead 8, a lead housing tube 34 that is connected to the rear of the chuck 31 and that accommodates the writing lead 8, and a fastener that is fitted onto the head portion 31a of the chuck 31. 32, a connector 33 for receiving the fastener 32 at the rear, an elastic body 35 made of a compression coil spring disposed between the connector 33 and the core housing tube 34, and connected to the rear of the core housing tube 34. and a cylindrical rear connecting tube 36 that

The chuck 31 is configured to be movable back and forth with respect to the connector 33 together with the core housing tube 34 . A head portion 31a of the chuck 31 is divided into two along the axial direction, and the divided heads 31a are formed so as to gradually separate from each other toward the front. are bent radially inward, so that the writing lead 8 can be clamped.

The coupler 33 is held between the front end of the front shaft 21 and the inner step of the tip 23 screwed to the front shaft 21 and fixed to the barrel 2 . In addition, an elastic body 35 is stretched between the inner stage of the connector 33 and the front end of the lead housing tube 34, and the elastic force of the elastic body 35 causes the chuck 31 and the lead housing tube 34 to move together. 33 and the barrel 2 are rebounded backward.

The rear connecting tube 36 has a larger diameter at the rear than the front, and the inner circumference is formed in a funnel shape that slopes toward the center. The front end of the operating body 4 is configured to abut on the rear end of the rear connecting tube.

The operating body 4 includes a cylindrical operating body 41, a cylindrical front cylinder 42 press-fitted or fitted over the front outer peripheral portion of the operating body 41, and press-fitted into the rear inner peripheral portion 4c of the operating body 41. It has a tail crown 43 that is fitted or fitted over.

A handwriting changing member 5 having a cylindrical eraser is detachably attached to the front inner peripheral portion 4a of the operation body 41. The handwriting changing member 5 is attached so as to protrude forward from the front end of the operating body 4 , and the projecting portion 5 a of the handwriting changing member 5 is formed in front of the operating body 4 . Further, at the rear portion of the operating body 4 (tail crown 43), a rear stage 4d is formed that can come into contact with the regulating portion 2d of the barrel 2 when the operating body 4 is attached to the barrel 2 with the front and rear reversed. .

A magnet 6 made of a permanent magnet is press-fitted or fitted over the central inner peripheral portion 4b of the operating body 4 (operating body 41). The axial length of the magnet 6 is substantially the same as the axial length of the cylindrical body 7 (ferromagnetic body). Also, as shown in FIG. 2, the magnet 6 of the present embodiment is formed so that one half of the surface is an N pole 6a and the other half is an S pole 6b when viewed in the cross-sectional direction. Thereby, the magnet 6 generates a strong magnetic field in the direction of the arrow in FIG.

A circumferential projection 4e that protrudes outward and extends in the circumferential direction is formed on the central outer peripheral portion of the operating body 4 (operating body 41). The circumferential projection 4e is formed so as to be positioned substantially in the center of the magnet 6 in the axial direction. With this circumferential projection 4 e , even if the operating body 4 is swung in the radial direction when the operating body 4 slides back and forth with respect to the barrel 2 and when the operating body 4 is attached to or detached from the barrel 2 , the inner surface of the barrel 7 or the barrel 2 does not move. Since there is no surface contact with the outer surface of the operation body 4 and the contact area is small, the contact resistance during movement can be reduced.

The operating body 4 is detachably attached to the attachment opening 9 of the barrel 2 and slidable along the axial direction, as described above. When mounted, the operation body 4 is attracted to the tubular body 7 (ferromagnetic body) by the magnetic force of the magnet 6 . At this time, the magnetic force of the magnet 6 acts strongly in the axial direction, which is the direction of the arrow in FIG. It is As a result, the magnet 6 is stably fixed by the magnetic force at substantially the same position as the tubular body 7 (ferromagnetic body) in the axial direction. Further, when the operating body 4 is attached to the shaft tube 2, the front end of the operating body 4 (front tube 42) is brought into contact with the rear end of the feeding mechanism 3 (rear connecting tube 36). Therefore, by pushing the operating body 4 forward, the rear connecting cylinder 36 of the delivery mechanism 3 can be pushed forward.

The handwriting changing member 5 is composed of an eraser 51 made of synthetic rubber and a cover 52 press-fitted to the outer periphery of the eraser 51 . When the handwriting changing member 5 is attached to the front inner peripheral portion 4a of the operation body 4, the outer step portion of the cover 52 abuts against the front end portion of the operation body 4, so that the front end portion of the operation body 4 is prevented from being immersed any deeper, and the projecting portion does not move. 5a is formed.

Next, a state in which the writing lead 8 is drawn out from the front end opening 2b of the barrel 2 (tip 23) by advancing the operating body 4 will be described with reference to FIGS. 1 and 4. FIG.
When the operating body 4 is pushed forward from the state shown in FIG. , and the chuck 31 connected to the lead housing tube 34 move forward with respect to the barrel 2 and the connecting member 33 while holding the writing lead 8 against the elastic force of the elastic body 35 . A writing lead 8 is drawn out from the front end opening 2b. At this time, as the chuck 31 advances, the fastener 32 fitted on the head portion 31a of the chuck 31 also advances, but the front end of the fastener 32 contacts the inner stage 2e of the barrel 2 (tip 23). As a result, the fastener 32 is separated from the head portion 31a of the chuck 31, the head portion 31a is expanded, the holding state of the writing lead 8 is released, and the advance of the writing lead 8 is stopped. Then, when the forward pressure of the operating body 4 is released, the chuck 31 is retracted by the elastic force of the elastic body 35, and the fastener 32 is again fitted over the head 31a, and the writing lead 8 is clamped by the chuck 31. be done. At this time, even when the operating body 4 is advanced, the magnetic force acting between the magnet 6 and the cylindrical body 7 pulls the operating body 4 rearward until the axial positions of the magnet 6 and the cylindrical body 7 are aligned. be done. Therefore, it is not necessary to rebound the operation body 4 backward by the elastic body 35 , and the rebound force of the elastic body 35 can be reduced by the weight of the operation body 4 .

Next, a state in which the operating body 4 is removed from the barrel 2 and attached to the barrel 2 again will be described with reference to FIGS. 1 and 5. FIG. In the knock-type writing instrument 1 of this embodiment, from the state shown in FIG. By pulling backward, the operating body 4 can be pulled out from the barrel 2 as shown in FIG. At this time, since the handwriting changing member 5 is pulled out together with the operating body 4 and exposed to the outside, the operating body 4 can be firmly gripped as a grip portion, and the handwriting by the writing lead 8, which is a lead lead, can be changed. It can be removed from the writing surface by rubbing with the member 5 (eraser 51). Further, when the operation body 4 is removed from the barrel 2, the rear portion of the rear connecting barrel 36 is open, so that a supplementary writing lead is inserted into the barrel 2 through the rear end opening 2c of the barrel 2. Thus, the writing lead can be replenished from the funnel-shaped rear inner peripheral portion of the rear connecting tube 36 to the lead housing tube 34 . Then, when the removed operating body 4 is brought close to the mounting opening 9 of the barrel 2 from the handwriting changing member 5, the operating body 4 is drawn into the barrel 2 by the magnetic force of the magnet 6, and returns to the original position shown in FIG. be adsorbed. At the time of this attachment, the rear end of the feeding mechanism 3 (rear connecting cylinder 36) and the front end of the operation body 4 (front cylinder 42) abut against each other. For this reason, the configuration is such that a "click" sound is generated at the time of contact, whereby the user can perceive from the sound that the operating body 4 has been completely attached.

Further, in this embodiment, when the operation body 4 is pulled out as shown in FIG. can. When the operating body 4 is turned upside down and brought close to the mounting opening 9 of the barrel 2 from the rear end (tail crown 43) side, the operating body 4 is moved by the magnetic force of the magnet 6 in the same manner as when the handwriting changing member 5 is attached from the side. It will be in the state shown in FIG. In this state of FIG. 6, the restricting portion 2d of the barrel 2 and the rear stage 4d of the operating body 4 are in contact with each other, and the projecting portion 5a of the handwriting changing member 5 protrudes rearward from 2c of the barrel 2. A body 4 is attached to the barrel 2 . Therefore, when rubbing the handwriting of the writing lead 8 with the handwriting changing member 5 (eraser 51) in the state of FIG. Since 2 has a larger shaft diameter, it is easier to apply force than when gripping the operating body 4 and performing a rubbing action. Therefore, it is possible to easily perform the rubbing action and remove the handwriting.

In this embodiment, the material constituting the cylindrical body 7 (ferromagnetic material) is a material that is attracted by the magnetic force of the magnet 6, is strongly magnetized by a magnetic field, and remains magnetized even when the magnetic field is removed. Examples include iron, cobalt, nickel and their alloys, and ferrite.

In this embodiment, the knock-type writing instrument 1 allows the operation body 4 removed from the barrel 2 to be easily and reliably reattached to the barrel 2 by magnetic force without causing any trouble in the feeding mechanism 3. was able to provide

A knock-type writing instrument 1 of this embodiment includes a barrel 2, a writing body 8 that is housed inside the barrel 2 and has a writing part at its tip, a feeding mechanism 3 that feeds the writing body 8 forward, and a feeding mechanism 3. and an operation body 4 that is arranged behind and operates the feeding mechanism 3, is locked in front of the operation body 4, and changes handwriting for removing, discoloring by heat, or concealing handwriting written with the writing body 8 At least a part of the operating body 4 protrudes from the barrel 2 and slides back and forth with respect to the barrel 2 due to the magnetic force acting between the barrel 2 and the operating body 4. It is attached removably and removably.

According to such a knock-type writing instrument 1, the operation body 4 for operating the drawing mechanism 3 for drawing out the writing body 8 is attached detachably and slidably to the barrel 2 by magnetic force. Since the operation mechanism does not have a locking or press-fitting structure, the operation mechanism is not pressed when the pen is mounted, and the feeding mechanism 3 is prevented from being unintentionally operated and the writing body 8 is fed out. Further, since the handwriting changing member 5 is provided in front of the operating body 4, the handwriting changing member 5 can be removed at the same time when the operating body 4 is removed from the barrel 2. Since the changeable member 5 is not soiled with hand oil or the like and can be firmly gripped, it is possible to easily perform a rubbing operation for erasing or discoloring the written handwriting or an operation for concealing the handwriting. . In addition, since the handwriting changing member 5 can be accommodated in the barrel 2 when not in use, the handwriting changing member 5 may be damaged by other articles when it is not in use or when it is carried in a bag, pencil case, or the like. It is possible to prevent the handwriting changing member 5 from scratching or staining other articles.

The handwriting changing member 5 in the present embodiment is an eraser made of synthetic rubber that removes handwriting with a lead lead by rubbing, or changes color from color to color due to frictional heat when handwriting with thermochromic ink or solid lead is rubbed. , a friction body made of an elastic material that changes color from colored to colorless, a correction fluid that conceals handwriting by applying paint over the handwriting, and a handwriting that is hidden by sticking tape over the handwriting. Correction tape or the like can be used to More preferably, it is preferable to use an eraser or a friction member that does not require a large space and can be easily fixed. Note that the retractable writing instrument 1 of the present embodiment can be employed in retractable mechanical pencils, ballpoint pens, markers, fountain pens, multi-core writing instruments, and the like. The elastic material constituting the friction body is preferably a synthetic resin (rubber, elastomer) having elasticity. -styrene copolymer), fluorine-based resins, chloroprene resins, nitrile resins, polyester-based resins, ethylene propylene diene rubber (EPDM), and the like.

In the knock-type writing instrument 1 of this embodiment, either the barrel 2 or the operating body 4 is provided with the magnet 6 , and the other is provided with the ferromagnetic material 7 that is magnetically attached by the magnetic force of the magnet 6 .

According to such a knock-type writing instrument 1, the magnetic force generated by the magnet 6 provided on either the barrel 2 or the operating body 4 attracts the ferromagnetic material 7 provided on the other, so that press-fitting or locking is possible. The operation body 4 can be magnetically fixed to the barrel 2 without using any structure. When the operation body 4 is magnetically attached to the barrel 2, the magnetic force, the magnetic field, the shape, and the relationship between the magnet 6 and the ferromagnetic body 7 are used so that the position of the operation body 4 with respect to the barrel 2 in the axial direction is stable. It is preferable to adjust the distance of As a result, when the operating body 4 is attached to the barrel 2, it is possible to prevent the operating mechanism from malfunctioning due to the operating body 4 pressing the operating mechanism forward.

The ferromagnetic material 7 in this embodiment refers to a material that is strongly magnetized by a magnetic field and remains magnetized even when the magnetic field is removed, such as iron, cobalt, nickel and their alloys, and ferrite.

In the knock-type writing instrument 1 of the present embodiment, the feeding mechanism 3 is operated by operating the operating body 4, and when the distance between the magnet 6 and the ferromagnetic body 7 is maximized, the magnet 6 and the ferromagnetic body 7 The operating body 4 returns to the position before the operation only by the magnetic force acting between .

According to such a knock-type writing instrument 1, even if the operating body 4 is moved forward by a pressing action or the like, the operating body 4 returns to its original position by magnetic force, so the operating body 4 is urged by a compression spring such as a coil spring. It is not necessary, and the configuration of the operating mechanism can be simplified to reduce the cost.

In the knock-type writing instrument 1 of this embodiment, when the operating body 4 is removed from the barrel 2, it can be detachably attached to the barrel 2 by magnetic force even if the front-rear direction of the operating body 4 is reversed.

According to such a knock-type writing instrument 1, the handwriting changing member 5 locked to the operating body 4 projects rearward from the rear end of the barrel 2, thereby preventing the removed operating body 4 from being lost or damaged. In addition, when removing, discoloring, or concealing handwriting using the handwriting changing member 5, the operation can be performed by holding the barrel 2. It is suitable because it can be firmly gripped and can be easily applied with force.

In the knock-type writing instrument 1 of the present embodiment, when the operating body 4 is attached to the barrel 2 with the front and back reversed, the operating body 4 comes into contact with the restricting portion 2d that restricts the forward movement of the operating body 4. .

According to such a knock-type writing instrument 1, even if force is applied when using the handwriting changing member 5, it is possible to prevent the handwriting changing member 5 from advancing and slipping into the barrel 2 together with the operating body 4. When using the variable member 5, more force can be applied.

This embodiment can provide the knock-type writing instrument 1 that allows the operation body 4 removed from the feeding mechanism 3 of the writing body 8 to be easily and reliably attached to the feeding mechanism 3 .

In the present embodiment, the handwriting changing member 5 is an eraser made of synthetic rubber for erasing the lead of a mechanical pencil, but the present embodiment is not limited to this. An elastic friction body may be used for thermally discoloring handwriting with ink or a thermochromic solid core from colored to colorless or from colored to colored by frictional heat generated by rubbing, and the paint is applied over the handwriting. A correction fluid for concealing the handwriting, or a correction tape for concealing the handwriting by sticking tape or the like on the handwriting may be used.

The retractable writing instrument of the present embodiment can be widely used for retractable writing instruments, and can be employed in retractable mechanical pencils, retractable ballpoint pens, markers, fountain pens, multicore writing instruments, and the like.

(Second embodiment)
FIG. 7 is a longitudinal end view of a swing-type mechanical pencil according to a second embodiment of the present invention, FIG. 8 is an enlarged end view showing the BB end face of FIG. 7, and FIG. 10 is an exploded view showing an exploded state for explaining the relationship between an operation body and parts fixed to the operation body in the mechanical pencil, and FIG. FIG. 11 is a longitudinal sectional view showing a state in which the chuck advances by operating , FIG. FIG. 12 is a vertical end view showing a state in which the operating body is remounted on the shaft cylinder with the front-rear direction reversed from the state in FIG. 11 ;

As shown in FIGS. 7 and 8, the retractable mechanical pencil 101 includes a barrel 102 and a chuck 131 that holds a writing core 108 that is disposed inside the barrel 102 and that is made of a lead that serves as a writing body. A lead feeding mechanism 103 having a lead housing member (lead housing tube) 134 for housing a writing lead 108; and an operating body 104 which is disposed at the rear, detachably attached to the barrel 102 and protrudes rearward from the rear end opening 102c of the barrel 102 .

The barrel 102 has a tapered cylindrical tip 123 , a cylindrical front shaft 121 screwed to the rear of the tip 123 , and a cylindrical rear shaft 122 screwed to the rear of the front shaft 121 . , and an inner hole is formed in the interior of the barrel 102 so as to penetrate therethrough in the front-rear direction. A grip 102a made of elastomer is integrally formed on the outer peripheral portion of the barrel 102 (front shaft 22) by two-color molding.

A lead holding member 124 that holds the writing lead 108 with a light force is fixed to the front inner peripheral portion of the barrel 102 (tip 123) by press-fitting or overfitting. is formed with a front end opening 102b through which the writing lead 108 protrudes.

A rear end opening 102c is formed at the rear end of the barrel 102 (the rear end of the rear shaft 122). A cylindrical body 107 made of a ferromagnetic material is press-fitted or over-fitted into the rear end opening 102c. As a result, the cylindrical body 107 is fixed to the barrel 102, and the mounting opening 109 is formed by the cylindrical body 107 and the inner peripheral portion of the rear barrel 122. As shown in FIG. An operating body 104 , which will be described later, is attached to the attachment opening 109 so as to be slidable back and forth and detachable. In addition, an inner stepped restricting portion 102d that protrudes inward is formed on the inner peripheral portion of the barrel 102 (rear shaft 122). A protruding portion 102f is formed.

The lead feeding mechanism 103 includes a chuck 131 that holds the writing lead 108, a cylindrical connector 137 connected to the rear part of the chuck 131, and a lead accommodating member 134 connected to the rear part of the connector 137 and accommodating the writing lead 108. , a fastener 132 externally fitted on the head 131a of the chuck 131, a connector 133 for receiving the fastener 132 at the rear, and a compression coil spring provided between the connector 133 and the core accommodating member 134. It has a projecting body 135 and a cylindrical rear connecting cylinder 136 connected to the rear part of the lead accommodating member 134 .

The chuck 131 is configured to be movable back and forth with respect to the connector 133 together with the connector 137 and the core housing member 134 . A head portion 131a of the chuck 131 is divided into two along the axial direction, and the divided head portions 131a are formed so as to gradually separate from each other toward the front. are bent radially inward, so that the writing lead 108 can be clamped.

The connector 137 has elastic pieces extending circumferentially from the base at two opposing locations on the base substantially in the middle of the connector 137 . In addition, contact portions 137a projecting rearward in the axial direction are formed at the tip portions of the two elastic pieces. The front end of the weight body 110 is configured to contact the contact portion 137a. The force is transmitted to the chuck 131 and the lead accommodating member 134 through the connector 137, and the writing lead is accommodated in the lead accommodating member 134 by advancing the chuck 131 and the lead accommodating member 134. 108 is configured to be gripped by a chuck 131 and extended forward.

The coupler 133 is formed in a ring shape and is fixed to the barrel 102 by being sandwiched between the front end of the front shaft 121 and the inner stage of the tip 123 screwed to the front shaft 121 . An elastic body 135 is stretched between the inner stage of the connector 133 and the front end of the lead accommodating member 134, and the elastic force of the elastic body 135 causes the chuck 131, the connector 137 and the lead accommodating member 134 to move. , the connector 133 and the shaft tube 102 are rebounded backward.

The rear connecting tube 136 has a larger diameter at the rear than the front, and the inner circumference is formed in a funnel shape that slopes toward the center. The front end of the operating body 104 is configured to abut on the rear end of the rear connecting tube.

The weight body 110 is formed in a cylindrical shape using a stainless material, and is loosely fitted between the outer peripheral portion of the lead housing member 134 and the inner peripheral portion of the barrel 102 . When the weight 110 moves forward, it contacts the contact portion 137a of the connector 137, and when the weight 110 moves rearward, it contacts the protrusion 102f of the barrel 102. As shown in FIG.

The operation body 104 includes a cylindrical operation body 141, a cylindrical front cylinder 142 press-fitted or fitted over the front outer periphery of the operation body 141, and a rear inner periphery 104c of the operation body 141. It has a tail cap 143 that is fitted or over-fitted.

A rubbing member (handwriting changing member) 105 having a cylindrical eraser is detachably attached to the front inner peripheral portion 104a of the operation main body 141 . The rubbing member 105 is attached so as to protrude forward from the front end of the operating body 104 , and a projecting portion 105 a of the rubbing member 105 is formed in front of the operating body 104 . Further, at the rear portion of the operating body 104 (tail crown 143), a rear stage 104d is formed that can come into contact with the regulating portion 102d of the shaft cylinder 102 when the operating body 104 is attached to the shaft cylinder 102 with its front and rear reversed. .

A magnet 106 made of a permanent magnet is press-fitted or over-fitted into the central inner peripheral portion 104b of the operating body 104 (operating body 141). The axial length of the magnet 106 is substantially the same as the axial length of the tubular body 107 (ferromagnetic body). Also, as shown in FIG. 8, the magnet 106 of this embodiment is formed so that one half of the surface is an N pole 106a and the other half is an S pole 106b when viewed in the cross-sectional direction. Thereby, the magnet 106 generates a strong magnetic field in the arrow direction of FIG.

A circumferential projection 104e that protrudes outward and extends in the circumferential direction is formed on the central outer peripheral portion of the operating body 104 (operating body 141). The circumferential projection 104e is formed so as to be positioned substantially in the center of the magnet 106 in the axial direction. With this circumferential projection 104e, even if the operating body 104 is swung in the radial direction when the operating body 104 slides back and forth with respect to the shaft tube 102 and when the operating body 104 is attached to or detached from the shaft tube 102, the inner surface of the cylindrical body 107 or the shaft tube 102 does not move. Since there is no surface contact with the outer surface of the operation body 104 and the contact area is small, the contact resistance during movement can be reduced.

The operating body 104 is detachably attached to the attachment opening 109 of the barrel 102 and slidable along the axial direction, as described above. When attached, the operation body 104 is attracted to the cylindrical body 107 (ferromagnetic body) by the magnetic force of the magnet 106 . At this time, the magnetic force of the magnet 106 acts strongly in the direction of the arrow in FIG. It is As a result, the magnet 106 is stably fixed at substantially the same position as the cylindrical body 107 (ferromagnetic body) in the axial direction by magnetic force. Further, when the operating body 104 is attached to the barrel 102, a gap is formed between the front end of the operating body 104 (front cylinder 142) and the rear end of the lead feeding mechanism 103 (rear connecting cylinder 136). be done. When the operating body is pushed forward, the forward portion of the operating body 104 (front cylinder 142) and the rear end of the lead feeding mechanism 103 (rear connecting cylinder 136) come into contact with each other. By pressing forward, the lead feeding mechanism 103 (rear connecting cylinder 136) can be pressed forward. At this time, the projecting portion 105a of the rubbing member 105 is inserted into the rear inner hole portion of the core feeding mechanism 103 (rear connecting cylinder 136), and the rubbing member 105 and the core feeding mechanism 103 (rear connecting cylinder 136) come into contact with each other. It is configured so as not to touch.

The rubbing member 105 is composed of an eraser 151 made of synthetic rubber and a cover 152 press-fitted to the outer periphery of the eraser 151 . When the rubbing member 105 is attached to the front inner peripheral portion 104a of the operation body 104, the outer step portion of the cover 152 contacts the front end portion of the operation body 104, so that the operation body 104 is prevented from being immersed further, and the protruding portion 105a is prevented from being inserted. It is formed.

Next, a state in which the writing lead 108 is extended from the front end opening 102b of the barrel 102 (tip 123) by advancing the operating body 104 will be described with reference to FIGS. 7 and 10. FIG.
When the operation body 104 is pushed forward from the state shown in FIG. Then, the front portion of the operating body 104 that has moved forward abuts against the rear end of the rear connecting cylinder 136 and pushes it forward, and the core accommodating member 134, the connector 137, and the chuck 131 connected to the rear connecting cylinder 136 are elastic bodies. While holding the writing lead 108 against the elastic force of 135 , the writing lead 108 moves forward with respect to the barrel 102 and the connector 133 , and the writing lead 108 is drawn out from the front end opening 102 b of the barrel 102 . At this time, as the chuck 131 advances, the fastener 132 fitted on the head portion 131a of the chuck 131 also advances, but the front end of the fastener 132 contacts the inner step 102e of the barrel 102 (the tip 123). As a result, the fastener 132 is separated from the head portion 131a of the chuck 131, the head portion 131a is expanded, the holding state of the writing lead 108 is released, and the forward movement of the writing lead 108 is stopped. Then, when the forward pressure of the operating body 104 is released, the chuck 131 is retracted by the elastic force of the elastic body 135, and the fastener 132 is again fitted over the head 131a, and the writing lead 108 is clamped by the chuck 131. be done. At this time, even when the operating body 104 is advanced, the magnetic force acting between the magnet 106 and the cylindrical body 107 pulls the operating body 104 rearward until the axial positions of the magnet 106 and the cylindrical body 107 match. be done. Therefore, the operation body 104 can be automatically returned to its original position by the magnetic force without the need to rebound the operation body 104 backward by the elastic body 135 .

Note that the writing lead 108 can be drawn out by swinging the barrel back and forth.
When the barrel 102 is gripped and shaken back and forth from the state shown in FIG. 7, inertial force acts on the weight body 110 loosely fitted inside the barrel 102 and slides back and forth. When the weight body 110 advanced by inertial force comes into contact with the abutting portion 137a of the connector 137, the connector 137 can be advanced together with the chuck 131 and the lead accommodating member 134, which is the same as when the operating body 104 is advanced. It is possible to extend the writing lead 108 forward. When the shaft tube 102 is swung back and forth, the weight body 110 is fixed by the magnetic force acting between the magnet 106 and the cylindrical body 107 (ferromagnetic body), and the operating body 104 and the core feeding mechanism 103 are fixed. not come into contact.

Next, a state in which the operating body 104 is removed from the barrel 102 and attached to the barrel 102 again will be described. The swing-type mechanical pencil 101 of this embodiment grasps the operating body 104 from the state shown in FIG. 11, the operation body 104 can be pulled out from the barrel 102 by pulling backward. At this time, the rubbing member 105 is pulled out together with the operation body 104 and exposed to the outside. Therefore, since the operation body 104 serves as a grip portion, it can be firmly gripped, and handwriting by the writing lead 108, which is a lead lead, can be removed from the writing surface by rubbing with the rubbing member 105 (eraser 151). can. Further, when the operation body 104 is removed from the barrel 102, the rear portion of the rear connecting barrel 136 is open, so that a supplementary writing lead is inserted into the barrel 102 through the rear end opening 102c of the barrel 102. Thus, the writing lead can be replenished to the lead accommodating member 134 from the funnel-shaped rear inner peripheral portion of the rear connecting cylinder 136 . Then, when the removed operating body 104 is brought close to the mounting opening 109 of the barrel 102 from the rubbing member 105, the operating body 104 is attracted into the barrel 102 by the magnetic force of the magnet 106 and is attracted to the position shown in FIG. . During this mounting, the rear end of the lead feeding mechanism 103 (rear connecting barrel 136) and the front end of the operating body 104 (front barrel 142) do not come into contact with each other, and the rear connecting barrel 136 is pressed by the operating body 104. Therefore, it is possible to prevent the lead feeding mechanism 103 from malfunctioning and unintentionally feeding the writing lead 108 .

Further, in this embodiment, when the operation body 104 is pulled out as shown in FIG. can be done. When the operating body 104 is turned upside down and brought closer to the mounting opening 109 of the shaft tube 102 from the rear end (tail plug 43) side, the operating body 104 is axially moved by the magnetic force of the magnet 106 in the same manner as when attaching from the rubbing member 105 side. It will be in the state shown in FIG. 12, the restricting portion 102d of the barrel 102 and the rear stage 104d of the operating body 104 are in contact with each other, and the projecting portion 105a of the rubbing member 105 protrudes rearward from the rear end opening 102c of the barrel 102. The operation body 104 is attached to the barrel 102 in this state. Therefore, when rubbing the handwriting of the writing lead 108 with the rubbing member 105 (eraser 151) in the state of FIG. Since the shaft diameter is larger, it is easier to apply a force than when the operation body 104 is gripped and rubbed. Therefore, it is possible to easily perform the rubbing action and remove the handwriting. In the state shown in FIG. 12, the rear stage 104d of the operating body 104 is in contact with the restricting portion 102d of the barrel 102, so the writing lead 108 cannot be extended by pressing the operating body 104 forward. However, by swinging the barrel 102 back and forth, the inertial force generated advances the weight body 110, which advances the chuck 131 via the connector 137, and allows the writing lead 108 to be drawn out, which further enhances convenience. improved.

In this embodiment, the material constituting the tubular body (ferromagnetic body) 107 is a material that is attracted by the magnetic force of the magnet 106, is strongly magnetized by a magnetic field, and remains magnetized even when the magnetic field is removed. Examples include iron, cobalt, nickel and their alloys, and ferrite.

The swing-out type mechanical pencil 101 of the present embodiment uses a magnet 106 to realize a simple mounting structure of the operation body 104 to the barrel 102, and a scraping member 105 (eraser 151) housed inside the barrel 102. ) could be easily exposed and made available.

In this embodiment, the rubbing member 105 is an eraser made of synthetic rubber for removing the lead lead of a mechanical pencil, but the present embodiment is not limited to this. An elastic friction body may be used for thermally discoloring the handwriting with the color-changing solid core from colored to colorless or from colored to colored by frictional heat generated by rubbing. The elastic material constituting the friction body is preferably a synthetic resin (rubber, elastomer) having elasticity, such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene- butadiene-styrene copolymer), fluorine-based resin, chloroprene resin, nitrile resin, polyester-based resin, ethylene propylene diene rubber (EPDM), and the like.

[1] A knock-type writing instrument (swing-type mechanical pencil) 101 of the present embodiment includes a chuck 131 that holds a writing lead 108 in a shaft cylinder 102, a cylindrical lead accommodating member 134 that accommodates the writing lead 108, A weight body 110 is attached to the lead accommodation member 134 so as to be slidable back and forth in the axial direction. It has an operation body 104 to operate, and the weight body 110 moved by the inertia force when the barrel 102 is swung back and forth advances the chuck 131 to advance the core by pressing the operation body 104 forward. A mechanism 103 is actuated to draw out a writing lead 108 from a front end opening 102b of a barrel 102 in a knock-type writing instrument (swing-out type mechanical pencil) 101. An operating body 104 slides back and forth with respect to the barrel 102 by magnetic force. It has a rubbing member 105 which is movably and detachably mounted, is engaged with the front part of the operating body 104, and removes or thermally discolors the handwriting written with the writing core 108, and the operating body 104 is not operated. At times, the operating body 104 and the lead housing member 134 are separated from each other, and in a state in which the operating body 104 and the lead housing member 134 are moved forward during operation, a knock-type writing instrument (swing-type writing instrument) configured to contact the rear end of the lead housing member 134 mechanical pencil) 101.

According to such a knock-type writing instrument 101, the operation body 104 for operating the lead feeding mechanism 103 for feeding the writing lead 108 for writing is slidably and detachably attracted to the barrel 102 by magnetic force. Since the lead accommodating member 134 of the lead feeding mechanism 103 and the operating body 104 are mounted in a state separated from each other, the operating body 104 does not press the lead accommodating member 134 to operate the operating mechanism at the time of attachment. Therefore, it is possible to prevent the lead feeding mechanism 103 from malfunctioning and the writing lead 108 from being fed out. In addition, since the operating body 104 is detachably attached to the shaft cylinder 102 by magnetic force, there is no need to have a locking or press-fitting structure for the operating mechanism, and the operating body 104 can be operated without providing a complicated structure. can be automatically attracted to the shaft cylinder 102 by magnetic force, and the operation body 104 can be prevented from being attached to the shaft cylinder 102 incompletely. Since the rubbing member 105 is locked to the front portion of the operating body 104, the rubbing member 105 can be easily exposed to the outside by removing the operating body 104 from the barrel 102, and the operating body 104 can be removed. By gripping the rubbing member 105, the rubbing member 105 is not soiled with hand oil or the like, and by being able to be gripped firmly, it is possible to easily apply force when the rubbing operation is performed by the rubbing member 105 in order to remove handwriting or heat discoloration. have.

Further, since the operating body 104 is fixed to the shaft tube 102 by magnetic force in a state in which the lead housing member 134 and the operating body 104 are separated from each other, the weight of the operating body 104 is transmitted to the chuck 131 via the lead housing member 134. can be prevented from affecting the gripping force of the writing lead 108 by the chuck 131 .

The writing lead 108 in the present embodiment is not particularly limited as long as it can be accommodated in a mechanical pencil and can be drawn out and written on, but lead that can be removed from the writing surface by rubbing the handwriting A lead, a colored solid lead, and a thermochromic solid lead that changes color from colored to colored or from colored to colorless by heating the handwriting can be preferably used.

The rubbing member 105 in the present embodiment is a synthetic rubber eraser that removes handwriting with a lead lead or a colored solid core by rubbing, or a color change from color to color due to heat when rubbing handwriting with a thermochromic solid core. , a friction body made of an elastic material that changes color from colored to colorless, or the like can be used. The elastic material constituting the friction body is preferably a synthetic resin (rubber, elastomer) having elasticity. -styrene copolymer), fluorine-based resins, chloroprene resins, nitrile resins, polyester-based resins, ethylene propylene diene rubber (EPDM), and the like.

[2] The knock-type writing instrument (swing-type mechanical pencil) 101 of the present embodiment includes a magnet 106 on either the barrel 102 or the operating body 104, and the ferromagnetism that is attracted to the other by the magnetic force of the magnet 106. A knock-type writing instrument (drawing-type mechanical pencil) 101 according to [1] having a body 107 .

According to such a knock-type writing instrument 101, the magnetic field generated by the magnet 106 provided on either the barrel 102 or the operating body 104 attracts the ferromagnetic material 107 provided on the other, so that press-fitting or locking is possible. The operation body 104 can be magnetically fixed to the barrel 102 without using any structure. When the operation body 104 is attached to the barrel 102 by magnetic force, the magnetic force, the magnetic field, the shape, and the relationship between the magnet 106 and the ferromagnetic body 107 are used so that the position of the operation body 104 with respect to the barrel 102 in the axial direction is stable. It is preferable to adjust the distance of As a result, when the operating body 104 is attached to the barrel 102, the operating body 104 can prevent the operating mechanism from erroneously operating due to the operating body 104 pushing the operating mechanism forward. It can be attached with a certain distance from the member 134 .

The ferromagnetic material 107 in this embodiment refers to a material that is strongly magnetized by a magnetic field and remains magnetized even after the magnetic field is removed, such as iron, cobalt, nickel and their alloys, and ferrite.

Further, when the manipulating body 104 is operated to operate the pullout mechanism and the manipulating body 104 advances to maximize the distance between the magnet 106 and the ferromagnetic body 107, the magnet 106 and the ferromagnetic body 107 move forward. The operating body 104 may be configured to return to the position before operation only by the magnetic force acting between the Since it returns, there is no need to urge the operation body 104 with a compression spring such as a coil spring, so that the mounting structure of the operation body 104 can be simplified and the cost can be reduced.

[3] In the knock-type writing instrument (swing-type mechanical pencil) 101 of the present embodiment, when the operation body 104 is removed from the barrel 102, even if the front-rear direction of the operation body 104 is reversed, the magnetic force exerts on the barrel 102. The retractable writing instrument (drawing mechanical pencil) 101 according to [1] or [2], which can be detachably attached with

[4] In the knock-type writing instrument (swing-type mechanical pencil) 101 of the present embodiment, when the operation body 104 is attached to the barrel 102 with the operation body 104 reversed, at least the rubbing member 105 engaged with the operation body 104 is A knock-type writing instrument (drawing-type mechanical pencil) 101 according to [3], a part of which protrudes outside from a barrel 102 .

According to such a knock-type writing instrument 101, the rubbing member 105 engaged with the operation body 104 projects rearward from the rear end of the barrel 102, thereby preventing loss or damage of the removed operation body 104. In addition, when handwriting is removed or discolored using the rubbing member 105, the barrel 102 can be gripped and operated. It is suitable because it becomes easy to apply force.

[5] In the knock-type writing implement (swing-type mechanical pencil) 101 of the present embodiment, when the operation body 104 is attached to the barrel 102 with the front and back reversed, the operation body 104 moves forward. The retractable writing instrument (drawing type mechanical pencil) 101 according to [3] or [4], which abuts on the regulating portion 102d that regulates the .

According to such a knock-type writing instrument 101, even if a force is applied when using the scraping member 105, the scraping member 105 can be prevented from advancing and slipping into the barrel 102 together with the operating body 104. can apply more force when using

The present embodiment realizes a simple mounting structure of the operation body 104 to the barrel 102, and a knock-type writing instrument that can be used by easily exposing the rubbing member 105 housed inside the barrel 102 (swing-out type). mechanical pencil) 101 could be provided.

(Third Embodiment)
13 to 19 show a third embodiment of the invention. FIG. 13 is a vertical cross-sectional view showing the thermochromic writing instrument of this embodiment when not in use, FIG. 14 is an enlarged end view along line CC of FIG. 13, and FIG. FIG. 16 is an exploded view of two operating bodies, FIG. 16 is a vertical cross-sectional view of the state in which the second operating body is advanced from the state of FIG. 13, and FIG. 17 is a longitudinal end view of this embodiment when in use. 18 is an explanatory diagram illustrating a state in which the second operating body is removed from the state in FIG. 13; FIG. 14 is a vertical end view showing a state in which the second operating body is removed from the state of FIG. 13 and attached with the second operating body turned upside down; FIG.

A thermochromic writing instrument 201 of this embodiment includes a barrel 202, a writing body 203 housed in the barrel 202, a first operating body 204 protruding radially outward from the outer surface of the barrel 202, A retractable mechanism is provided for retracting the pen tip 231 of the writing body 203 from the front end hole 227 of the barrel 202 by sliding the first operating body 204 forward.

The writing body 203 includes a pen tip 231, an ink storage tube 232 in which the pen tip 231 is press-fitted and fixed to a front end opening, a thermochromic ink filled in the ink storage tube 232, and the thermochromic ink. It consists of a follower (for example, a high viscosity fluid) filled at the trailing end of the ink and advanced as the thermochromic ink is consumed.

The pen tip 231 may, for example, be composed of only a metal ball-point pen tip that rotatably holds a ball at its front end, or may be composed of a synthetic resin pen tip holder that holds the rear outer surface of the ball-point pen tip. be done. A tail plug 233 is attached to the opening of the rear end of the ink storage tube 232. The tail plug 233 is provided with a ventilation hole through which the ink storage tube 232 can communicate with the outside. A spring is housed inside the pen tip 231 to push the front ball forward. The spring is a compression coil spring having a rod portion at the front end thereof, 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 inward front edge of the tip of the ballpoint pen due to the forward bias of the spring, preventing ink leakage and ink evaporation from the front end of the pen tip 231 .

The shaft tube 202 includes a tapered cylindrical front shaft 221, a cylindrical central shaft 222 screwed to the rear portion of the front shaft, and a cylindrical rear shaft 223 connected to the rear end of the central shaft 222. consists of A rear side wall 229 of the barrel 202 (a side wall of the center shaft 222 and the rear shaft 223) is formed with a slide hole 224 that extends in the front-rear direction and penetrates in the radial direction. A cam portion 226 is integrally formed on the inner surface of the barrel 202 (middle shaft 222 ), and an inner stepped restricting portion 228 projecting inwardly is formed on the inner surface of the rear shaft 223 behind the cam portion 226 . .

A rear end opening 225 is formed at the rear end of the barrel 202 (the rear end of the rear shaft 223). A cylindrical body 209 made of a ferromagnetic material is press-fitted or over-fitted into the rear end opening 225 . As a result, the cylindrical body 209 is fixed to the barrel 202, and a mounting opening 210 is formed by the cylindrical body 209 and the inner peripheral portion of the rear shaft 223. As shown in FIG. A second operating body 205 , which will be described later, is attached to the attachment opening 210 so as to be slidable back and forth and detachably.

The first operating body 204 includes an operating portion 241 protruding outward from the slide hole 224 of the barrel 202, a base portion 242 integrally connected to the operating portion 241, and integrally connected to the base portion 242. and a shaft portion 243 extending forward from the base portion 242 and a rear hole 244 extending forward from the rear end of the base portion 242 . The first operation body 204 is obtained by a molding of synthetic resin (for example, polycarbonate resin). Cam teeth that engage with the rotating member 207 are formed at the front end of the shaft portion 243 by being attached integrally or by a separate member. A friction body 206 , which will be described later, can be inserted into the rear hole 244 , and the front end of the friction body 206 contacts a bottom portion 245 of the rear hole 244 .

The second operating body 205 has a cylindrical operating body 251 and a tail crown 252 that is press-fitted or over-fitted to a rear inner peripheral portion 255 of the operating body 251 . A friction member 206 made of an elastic material is engaged with the front inner peripheral portion 253 of the operating body 251 by press fitting or overriding fitting. The friction body 206 protrudes forward from the front end of the second operating body 205. A protrusion 261 of the friction body 206 is formed in front of the second operating body 205, and the top of the protrusion 261 is formed in a convex curved shape. be. At the rear portion of the second operating body 205 (tail crown 252), there is provided a rear stage 256 that can abut against the restricting portion 228 of the barrel 202 when the second operating body 205 is attached to the barrel 202 with the front and rear reversed. is formed.

A magnet 208 made of a permanent magnet is press-fitted or fitted over the central inner peripheral portion 254 of the second operating body 205 (operating body 251). The axial length of the magnet 208 is substantially the same as the axial length of the cylindrical body 209 (ferromagnetic body). Also, as shown in FIG. 14, the magnet 208 of the present embodiment is formed so that one half of the surface is an N pole 281 and the other half is an S pole 282 when viewed in the cross-sectional direction. Thereby, the magnet 208 generates a strong magnetic field in the arrow direction of FIG.

As described above, the second operating body 205 is attached to the attachment opening 210 of the barrel 202 so as to be detachable and slidable along the axial direction. When attached, the second operating body 205 is attracted to the tubular body 209 (ferromagnetic body) by the magnetic force of the magnet 208 . At this time, the magnetic force of the magnet 208 acts strongly in the direction of the arrow in FIG. It is As a result, the magnet 208 is stably fixed at substantially the same position as the cylindrical body 209 (ferromagnetic body) in the axial direction by magnetic force. At this time, the friction body 206 engaged with the second operating body 205 is inserted into the rear hole 244 of the first operating body 204 and the front end of the friction body 206 is brought into contact with the bottom portion 245 . A rear end of the second operating body 205 protrudes rearward from a rear end opening 225 of the barrel 202 . Therefore, by pushing the second operating body 205 forward, the first operating body 204 can be pushed forward.

The retraction mechanism is a side-slide retraction mechanism that uses a rotating cam mechanism. The retraction mechanism includes a cam portion 226 formed on the inner surface of the rear shaft 223, a rotating member 207 that engages with the cam portion 226 and contacts the rear end of the writing body 203, and engages with the rotating member 207 and A first operating body 204 projecting radially outward from the slide hole 224 , a second operating body 205 projecting rearward from a rear end opening 225 of the barrel 202 , and a writing device housed in the barrel 202 . and an elastic body 211 (eg, a compression coil spring) that biases the body 203 rearward. The retraction mechanism of the present embodiment is a double-knock type in which both the pen tip projecting operation and the pen tip retracting operation are performed by sliding the first operating body 204 forward or pressing the second operating body 205 forward.

13, the second operating body 205 is pressed forward against the magnetic force of the magnet 208 and the backward urging by the elastic body 211. 204 is pushed forward, the rotary member 207 is pushed forward by the first operating body 204, the rotary member 207 pushes the rear end of the writing body 203 forward, and the pen tip 231 is pushed forward and outside through the front end hole 227. Protruded. At this time, the rotating member 207 is engaged with the cam portion 226, and the state shown in FIG. 16 is obtained in which the protruding state of the pen tip is maintained. Then, the second operating body 205 is attracted to the cylindrical body (ferromagnetic body) by the magnetic force of the magnet 208 and retreats to the position before being pressed, resulting in the state shown in FIG. As a result, the thermochromic writing instrument 201 becomes usable (writable).

Next, when the second operation body 205 is pressed forward against the magnetic force of the magnet 208 from the protruding state of the pen tip shown in FIG. It contacts the bottom of the first operating body 204 and advances the first operating body 204 . Then, the first operating body 204 that has moved forward advances the rotating member 207, disengages the cam portion 226 from the rotating cam of the rotating member 207, and moves the rotating member 207 backward. 203, the first operating body 204 and the second operating body 205 move backward to enter the pen tip retracted state. As a result, the thermochromic writing instrument 201 enters a non-use state (writing non-use state and friction body non-use state). Also, when the writing body 203, the first operating body 204, and the second operating body 205 move backward, the second operating body 205 is attracted to the cylindrical body 209 (ferromagnetic body) by the magnetic force of the magnet 208. Since the rearward movement is stopped at , the impact force generated when the rearward movement is stopped is alleviated, and the first operating body 204 is received by the friction body 206 made of an elastic body fixed to the second operating body 205. . Therefore, the impact force applied to the writing body 203 is reduced. In particular, in the structure in which the pen tip of the writing body 203 holds the ball as in the present embodiment, when the writing body 203 receives a strong impact when the writing body 203 retreats, the ball retreats, and the ball and the tip of the ballpoint pen tip collide. This is particularly effective because there is a risk that air will be sucked in from between them and the ejection of ink inside will be hindered during writing.

It should be noted that the forward appearing and retracting operation of the writing body 203 can also be similarly performed by sliding forward only the first operating body 204, and in this case, it is not necessary to operate the second operating body 205. For this reason, the user can extend the cursive writing by operating either the first operating body 204 or the second operating body 205, and can shift from the non-use state to the use state, which is highly convenient.

Next, a state in which the second operating body 205 is removed from the barrel 202 and attached to the barrel 202 again will be described. The thermochromic writing instrument 201 of this embodiment holds the second operating body 205 from the state shown in FIG. 18, the second operation body 205 can be pulled out from the shaft tube 202 by pulling it out. At this time, since the frictional body 206 is pulled out together with the second operating body 205 and exposed to the outside, the second operating body 205 serves as a gripping portion and can be firmly gripped. is rubbed with the friction body 206 to generate frictional heat and discolor the handwriting. When the removed second operating body 205 is brought close to the mounting opening 210 of the shaft cylinder from the friction body 206, the magnetic force of the magnet 208 draws the second operating body 205 into the shaft cylinder, returning it to the original position shown in FIG. is adsorbed to

Further, in the present embodiment, when the second operating body 205 is reattached to the barrel 202 after being pulled out as shown in FIG. It can be attached to the barrel 202 . When the second operating body 205 is turned upside down and brought closer to the mounting opening 210 of the barrel 202 from the rear end side, the magnetic force of the magnet 208 turns the second operating body 205 into a cylindrical shape in the same way as when attaching from the friction body 206 side. It is attracted to the body 209 (ferromagnetic body) and becomes the state shown in FIG. In the state shown in FIG. 19, the restricting portion 228 of the barrel and the rear stage 256 of the second operating body 205 are in contact with each other, and the friction body 206 protrudes rearward from the rear end opening 225 of the barrel 202. A second operating body 205 is attached to the barrel 202 . Therefore, when rubbing handwriting with thermochromic ink with the friction body 206 in the state of FIG. Since the diameter of the shaft is large, it is easier to apply force than when grasping the second operating body 205 to perform the rubbing action. Then, it is possible to easily perform the rubbing operation and thermally discolor the handwriting due to frictional heat. In the present embodiment, even when the second operating body 205 is attached in the reverse direction, the pen tip 231 of the writing body 203 can appear and retract by sliding the first operating body 204 along the axial direction. Since it is possible to do so, the convenience has been further improved.

In this embodiment, the elastic material constituting the friction body 206 is preferably an elastic synthetic resin (rubber, elastomer), such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin ( styrene-ethylene-butadiene-styrene copolymer), fluorine-based resins, chloroprene resins, nitrile resins, polyester-based resins, ethylene propylene diene rubber (EPDM), and the like. The synthetic resin having elasticity that constitutes the friction body 206 is not a high-wear elastic material (eg, an eraser), but a low-wear elastic material that produces almost no wear residue (eraser residue) during friction. The friction body 206 may be provided at least on the outer surface of the front end portion of the second operation body 205. For example, the friction body 206 made of an elastic material may be press-fitted, engaged, or screwed onto the outer surface of the front end portion of the second operation body 205. In this case, there is a configuration in which the second operating body 205 is locked (fixed) by fitting, adhesion, two-color molding, or the like, or a configuration in which the entire second operating body 205 other than the magnet 208 is integrally formed of an elastic material.

In this embodiment, the material constituting the cylindrical body 209 (ferromagnetic material) is a material that is attracted by the magnetic force of the magnet 208, is strongly magnetized by a magnetic field, and remains magnetized even when the magnetic field is removed. Examples include iron, cobalt, nickel and their alloys, and ferrite.

In the knock-type writing instrument (thermochromic writing instrument) 201 of the present embodiment, the friction body 206 can be housed in the barrel 202 except when necessary, and can be easily removed from the barrel together with the second operation body 205 attracted by magnetic force. Since the friction member 206 can be prevented from being soiled, the friction member 206 is highly convenient.

[1] A knock-type writing instrument (thermochromic writing instrument) 201 of the present embodiment accommodates a writing body 203 inside a barrel 202 so as to be movable in the front-back direction, and accommodates thermochromic ink inside the writing body 203. A pen point 231 capable of discharging thermochromic ink is provided at the front end of the writing body 203, and a first operating body 204 movable in the front-rear direction is protruded from the side wall 229 of the barrel 202, and the first operating body 204 is moved. By sliding forward, the pen point 231 of the writing body 203 can be retracted from the front end hole of the barrel 202, and the handwriting of the thermochromic ink is rubbed inside the barrel 202 to generate frictional heat. A knock-type writing instrument (thermochromic writing instrument) 201 containing a friction body 206 made of a low-abrasion elastic material capable of thermally discoloring the handwriting, wherein at least a part of the writing instrument 203 is provided behind the writing body 203 with a barrel 202 The second operating body 205 protrudes from the rear end and is capable of operating the first operating body 204. The second operating body 205 has a friction body 206 at the front and is axially moved relative to the barrel 202 by magnetic force. A retractable writing instrument (thermochromic writing instrument) 201 is detachably attached and slidable back and forth along the line.

According to such a knock-type writing instrument 201, since the friction body 206 is provided in the front part of the second operation body 205 and the friction body 206 is accommodated in the barrel 202, regardless of whether the pen tip 231 appears or disappears. , contact with the user's fingertips, contact with the friction body 206 and the inner surface of the housing (for example, the inner surface of the pen case, the bottom of the pen stand, or the inner surface of the pocket of clothes), and the friction body 206 can be prevented from dirt, dust, etc. adhesion (that is, contamination of the friction body 206) can be prevented. Further, since the second operating body 205 is detachably attached to the shaft tube 202 by magnetic force, there is no need to have a locking or press-fitting structure with respect to the shaft tube 202, and the second operating body 205 can be moved. Only by bringing it close to the shaft tube 202, it is automatically attracted to the shaft tube 202 by magnetic force. Therefore, the second operating body 205 can be easily attached to and detached from the barrel 202 . Furthermore, since the friction body 206 is provided in the front portion of the second operation body 205, the friction body 206 can be easily exposed to the outside by removing the second operation body 205 from the barrel 202, and the operation body By gripping the friction body 206, the friction body 206 is not soiled with dirt or oil from the hands. It has the effect of making it easier to hang.

Further, in the knock-type writing instrument 201 of the present embodiment, by operating the second operating body 205 protruding from the rear end of the barrel 202, the first operating body 204 is indirectly operated, and the pen tip of the writing body 203 is operated. 231 can be protruded from the front end hole of the barrel 202 , and the user can select either the first operating body 204 protruding from the side wall 229 of the barrel 202 or the second operating body 205 protruding from the rear end of the barrel 202 . can be selected to extend the cursive body 203, which is highly convenient.

In the present embodiment, the elastic material constituting the friction body 206 is preferably an elastic synthetic resin (rubber, elastomer), such as silicone resin, 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 that constitutes the friction body 2064 is not a highly abrasive elastic material (eg, an eraser), but a low-wear elastic material that produces almost no abrasion residue (eraser residue) during friction.

[2] The knock-type writing instrument (thermochromic writing instrument) 201 of the present embodiment includes a magnet 208 on either the barrel 202 or the second operating body 205, and a ferromagnetic material that is attracted to the magnet 208 on the other. 209, the knock-type writing instrument (thermochromic writing instrument) 201 according to [1].

According to such a knock-type writing instrument 201, the magnetic field generated by the magnet 208 provided on either the barrel 202 or the second operating body 205 attracts the ferromagnetic material 209 provided on the other. The second operating body 205 can be magnetically attracted to the barrel 202 without using a press-fitting or locking structure. When the second operating body 205 is magnetically attached to the barrel 202, the magnetic force and the magnetic field of the magnet 208 and the ferromagnetic body 209 are used so that the position of the second operating body 205 with respect to the barrel 202 in the axial direction is stable. , it is preferable to adjust the shape and the distance from each other. As a result, when the second operating body 205 is attached to the barrel 202, it is possible to prevent the pen tip 231 from being erroneously extended by the second operating body 205 pressing the first operating body 204 forward.

Note that the ferromagnetic material 209 in this embodiment refers to a material that is attracted by the magnetic force of the magnet 208, is strongly magnetized by a magnetic field, and remains magnetized even when the magnetic field is removed. and their alloys, ferrite, and the like.

Further, when the first operating body 204 is operated by operating the second operating body 205 and the second operating body 205 moves forward, the distance between the magnet 208 and the ferromagnetic body 209 is maximized. and the ferromagnetic body 209 only by the magnetic force acting between the second operating body 209 and the ferromagnetic body 209. Since the second operating body 205 returns to its original position, there is no need to urge the second operating body 205 with a compression spring such as a coil spring. In addition, since the second operating body 205 always returns to its original position even when the writing body 203 is extended, the barrel 202 is removed when the second operating body 205 is removed from the barrel 202 in order to use the friction body 206 . Since the second operation body 205 does not enter a state of being immersed inside, it is not difficult to hold the second operation body 205 .

[3] With the knock-type writing instrument (thermochromic writing instrument) 201 of the present embodiment, when the second operating body 205 is removed from the barrel 202, even if the front-rear direction of the second operating body 205 is reversed, the second operation can be performed. A knock-type writing instrument (thermochromic writing instrument) 201 according to [1] or [2], wherein a body 205 is detachably attached to the barrel 202 by magnetic force.

[4] In the knock-type writing instrument (thermochromic writing instrument) 201 of the present embodiment, when the second operating body 205 is attached to the barrel 202 with the front and back reversed, the frictional force retained by the first operating body 204 is reduced. A knock-type writing instrument (thermochromic writing instrument) 201 according to claim [3], wherein at least part of the body 206 protrudes outside from the barrel 202 .

According to such a knock-type writing instrument 201, the friction body 206 engaged with the second operating body 205 is configured to protrude rearward from the rear end of the barrel 202, so that the removed second operating body 205 can Loss and breakage can be prevented, and when the handwriting is thermally discolored using the friction body 206, the barrel 202 can be gripped and operated. It is suitable because it can be firmly gripped with a handle and can be easily applied with force.

[5] In the knock-type writing instrument (thermochromic writing instrument) 201 of the present embodiment, when the second operating body 205 is attached to the barrel 202 with the front and back reversed, the operating body moves forward. The knock-type writing instrument (thermochromic writing instrument) 201 according to [3] or [4], which abuts on the regulating portion 228 that regulates the .

According to such a knock-type writing instrument 201, even if a force is applied when using the friction body 206, it is possible to prevent the friction body 206 from advancing and slipping into the barrel 202 together with the second operation body 205. More force can be applied when the body 206 is in use, making it easier to perform a scraping action.

Claims

A barrel, a writing body housed inside the barrel and provided with a writing part at its tip, a feeding mechanism for feeding the writing body forward, and an operation body arranged behind the feeding mechanism for operating the feeding mechanism. and
a handwriting changing member mounted in front of the operating body for removing, thermally discoloring, or concealing handwriting written with the cursive body;
At least a portion of the operating body protrudes from the shaft cylinder, and the operating body is attached detachably and slidably back and forth with respect to the shaft cylinder by a magnetic force acting between the shaft cylinder and the operating body. Retractable writing instrument characterized by
　The knock-type writing instrument according to claim 1, characterized in that either one of the barrel or the operating body is provided with a magnet, and the other is provided with a ferromagnetic material that is attracted by the magnetic force of the magnet.
By operating the operating body, the feeding mechanism is operated, and when the distance between the magnet and the ferromagnetic body is maximized, the operating body is moved only by the magnetic force acting between the magnet and the ferromagnetic body. 3. The retractable writing instrument according to claim 2, wherein returns to the position before operation.
4. Any one of claims 1 to 3, characterized in that when the operating body is detached from the shaft cylinder, the operating body can be detachably attached to the shaft cylinder by magnetic force even if the front-rear direction of the operating body is reversed. or the knock-type writing instrument according to item 1.
The knock-type writing instrument according to claim 4, characterized in that, when the operating body is attached to the barrel with the front and back reversed, it abuts against a restricting portion that restricts the forward movement of the operating body.