CN210132909U - Pen instrument - Google Patents

Abstract

Provided is a pen tool that can quickly start a rubbing operation using a portion of a friction body intended by a user. The pen tool (1) is provided with an installation hole (23) opening to the axial rear at the rear end of the cylinder body (2), and a friction body (7) formed of an elastic material is inserted into the installation hole (23). An inward projection (24) is formed on the inner peripheral surface of the mounting hole (23), and an outward projection (75) is formed on the outer peripheral surface of the friction body (7). The lift (24) is locked in the front-rear direction. The friction body (7) is provided with a large-diameter portion (72) protruding axially rearward from the rear end of the cylindrical body (2), and the friction body (7) is inserted and mounted in such a manner as to be rotatable around the axis. hole (23). The outer surface of the large diameter portion (72) has a non-circular shape in cross section.

Description

pen tool

technical field

The utility model relates to a pen tool. More specifically, the present invention relates to a writing instrument in which a mounting hole opening axially rearward is provided at the rear end of a cylindrical body such as a barrel of the writing instrument or a pen cover, and a friction body is inserted into the mounting hole.

Background technique

In Patent Document 1, a thermochromic writing instrument is described, wherein, in the friction member for erasing handwriting by thermochromic ink, the cross section exposed at the rear end of the friction member is triangular, quadrangular, Other polygons such as hexagonal shapes.

In addition, Patent Document 2 describes an attachment structure for a soft member in which an attachment hole opening in an axial direction upward is provided at an upper end of a cylinder such as a barrel of a writing instrument, a pen cover, and the like, and an attachment hole is inserted into the attachment hole. The installation structure of a soft member formed by assembling a soft member is characterized in that an inward projection is formed on the inner peripheral surface of the installation hole, and an outward projection is formed on the outer peripheral surface of the soft member, and the outward projection is formed on the outer peripheral surface of the soft member. The protrusions go over the inward protrusions from above to below.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2016-144933

Patent Document 2: Japanese Patent Laid-Open No. 2007-144991

In the technique disclosed in Patent Document 1, before the rubbing operation is performed, it is necessary to rotate the shaft cylinder while visually checking the orientation of the friction body to re-grip, and the rubbing operation cannot be quickly performed. In particular, when there are protrusions such as a jig or an anti-rotation protrusion on the barrel, the user's holding method or holding position may be limited. Therefore, even if the cross-sectional shape of the friction member (corresponding to the friction body of the present invention) is a polygonal shape, it may be difficult to wipe off using the portion of the friction member intended by the user.

In addition, in the technique disclosed in Patent Document 2, the outer peripheral surface of the tip end portion of the small-diameter portion of the soft member (corresponding to the friction body of the present invention) (that is, the shoulder portion of the small-diameter portion and the large-diameter portion of the soft member) The outer peripheral surface of the connecting part) is formed with an inclined surface-shaped (that is, a conical surface-shaped) base portion whose outer diameter gradually increases as it moves upward. When the soft member is inserted into the mounting hole, the inclined surface-shaped The base of the mounting hole is in pressure contact with the opening edge of the mounting hole, so the user may not be able to freely rotate the soft member to the intended position. Therefore, even if the cross-sectional shape of the soft member is polygonal, it may be difficult to wipe off using the portion of the soft member intended by the user.

Utility model content

The present invention solves the above-mentioned conventional problems, and aims to provide a writing instrument that can quickly start a rubbing operation using the part of the friction body intended by the user.

In the present invention, "rear" means the friction body side in the whole pen tool, and "front" means the side opposite to the friction body side. In addition, in the present invention, "the pen tip entering state" means the state in which the pen tip enters the shaft barrel, and the "pen tip protruding state" means the state where the pen tip protrudes from the front end hole of the shaft tube to the outside.

The utility model provides a pen tool. An installation hole is arranged at the rear end of the shaft cylinder of the pen tool or the cylinder body of the pen sleeve, which is open to the rear in the axial direction. The friction body is characterized in that an inward projection is formed on the inner peripheral surface of the installation hole, an outward projection is formed on the outer peripheral surface of the friction body, and the outward projection and the inward projection are formed. Locked in the front-rear direction, the friction body includes a large-diameter portion projecting axially rearward from the rear end of the cylindrical body, and is inserted into the friction body so as to be rotatable about the axis. In the mounting hole, the outer surface of the large-diameter portion is non-circular in cross section.

Further, according to the above-mentioned writing instrument, the friction body includes a small-diameter portion that is integrally connected to the front of the large-diameter portion and is inserted into the mounting hole, and an outer surface of the small-diameter portion is horizontally disposed. The cross section is circular.

Further, according to the above-described writing instrument, a base portion is formed on the outer peripheral surface of the rear end portion of the small diameter portion, and the base portion is not in contact with the inner peripheral surface of the opening edge of the attachment hole during non-rubbing.

Further, according to the above-described writing instrument, the writing instrument has a contact portion where the base portion comes into contact with the inner peripheral surface of the opening edge of the mounting hole when rubbed.

Further, according to the above-described writing instrument, a knob portion for rotationally operating the friction body is formed on the outer peripheral surface of the large-diameter portion.

Further, according to the above-mentioned writing instrument, the outer surface of the large-diameter portion has a rectangular shape in cross section.

Moreover, according to the above-mentioned writing instrument, the outer surface of the said large diameter part has a triangular shape in the cross section, It is characterized by the above-mentioned.

In addition, according to the above-mentioned writing instrument, the outer surface of the large-diameter portion is triangular in cross section, the vertex of the triangle is arc-shaped, and the sides of the triangle are arc-shaped.

Further, according to the above-mentioned writing instrument, the cylindrical body into which the friction body is inserted is detachable from the writing instrument.

In addition, according to the above-mentioned writing instrument, it is characterized in that the maximum outer diameter of the outward protrusion is larger than the minimum inner diameter of the inward protrusion, and the maximum outer diameter of the outward protrusion is smaller than the inward protrusion The inner diameter of the mounting hole at the rear of the protrusion.

According to the present invention, the pen tool is formed with an inward projection on the inner peripheral surface of the mounting hole, and an outward projection is formed on the outer peripheral surface of the friction body, and the outward projection is connected with the outward projection. The inner protrusion is locked in the front-rear direction, the friction body is provided with a large-diameter portion protruding axially rearward from the rear end of the cylindrical body, and the friction body is rotatable around the axis. Inserted into the mounting hole, the outer surface of the large-diameter portion has a non-circular shape in cross-section, so that even if the cylindrical body has protrusions such as clamps or anti-rotation protrusions, the user's grasping method Or the holding position may be restricted, and the friction operation can be started quickly using the part of the friction body intended by the user.

According to the writing instrument of the present invention, it is possible to quickly start a rubbing operation using the portion of the friction body intended by the user.

Description of drawings

FIG. 1 is a vertical cross-sectional view of the writing instrument according to the first embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a main part of FIG. 1 .

FIG. 3 is an enlarged vertical cross-sectional view of a main part of FIG. 1 .

FIG. 4 is an enlarged vertical cross-sectional view of a main part at the time of friction in FIG. 1 .

Fig. 5(a) is an enlarged front view of the writing instrument (friction body) according to the first embodiment of the present invention. Fig. 5(b) is an enlarged side view of the writing instrument (friction body) according to the first embodiment of the present invention. Fig. 5(c) is a cross-sectional view taken along the line A-A of Fig. 5(a). Fig. 5(d) is a cross-sectional view taken along the line B-B of Fig. 5(a).

6 is an enlarged perspective view of the writing tool (friction body) according to the first embodiment.

(a) of FIG. 7 is an enlarged front view of the writing instrument (friction body) according to the second embodiment of the present invention. FIG.7(b) is an enlarged side view of the writing implement (friction body) of 2nd Embodiment of this invention. Fig. 7(c) is a cross-sectional view taken along the line C-C of Fig. 7(a).

8 is an enlarged perspective view of a writing instrument (friction body) according to a second embodiment.

(a) of FIG. 9 is an enlarged front view of the writing instrument (friction body) according to the third embodiment of the present invention. (b) of FIG. 9 is an enlarged side view of the writing instrument (friction body) according to the third embodiment of the present invention. Fig. 9(c) is a cross-sectional view taken along the line D-D in Fig. 9(a) . Fig. 9(d) is a cross-sectional view taken along the line E-E of Fig. 9(a).

10 is an enlarged perspective view of a writing tool (friction body) according to a third embodiment.

(a) of FIG. 11 is an enlarged front view of the writing instrument (friction body) according to the fourth embodiment of the present invention. (b) of FIG. 11 is an enlarged side view of the writing instrument (friction body) according to the fourth embodiment of the present invention. FIG. 11( c ) is a cross-sectional view taken along the line F-F of FIG. 11( a ). Fig. 11(d) is a cross-sectional view taken along the line G-G in Fig. 11(a).

12 is an enlarged perspective view of a writing instrument (friction body) according to a fourth embodiment.

Description of reference numerals

1 pen tool; 2 barrel body; 2a front axle; 2b intermediate axle; 2c rear axle; 21 front end hole; 22 sliding hole; 23 mounting hole; ;31 Pen tip; 32 Ink storage tube; 4 Operation part; 41 Operation base part; 42 Ball part; 43 Shaft part; 44 Clip part; ;73 Shoulder; 74 Small diameter; 75 Projecting outward; 75a Guide; 75b Maximum outer diameter; 76 Annular space; 77 Base; 78 Knob; 79 Contact; 8 Paper; A from large diameter The axial length from the front end of the barrel to the rear end of the outwardly convex; B the axial length from the rear end of the cylinder to the front end of the inwardly convex; C Axial clearance; a The outer diameter of the middle part of the small diameter part; b Installation The inner diameter of the inwardly convex rear portion of the hole.

Detailed ways

Hereinafter, four embodiments of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>

A first embodiment of the present invention is shown in FIGS. 1 to 6 .

The writing instrument 1 of the present embodiment includes a cylindrical body 2 , a pen body 3 accommodated in the cylindrical body 2 , and an in-out mechanism for allowing the pen tip 31 of the pen body 3 to enter and exit from the front end hole 21 of the cylindrical body 2 .

·Body

The pen body 3 includes a pen tip 31, an ink accommodating tube 32 that is press-fitted and fixedly installed with the pen tip 31 at the front end opening, a thermochromic ink 33 filled in the ink accommodating tube 32, and a thermochromic ink 33 filled in the thermochromic ink 32. The rear end of the ink 33 is a follower 34 (eg, a high-viscosity fluid) that advances as the thermochromic ink 33 is consumed.

The pen tip 31 may be constituted by, for example, only a metal ballpoint pen tip that rotatably holds a ball at the front end, or a synthetic resin pen tip holder that holds the rear outer surface of the ballpoint pen tip. any structure of the structure. In addition, a tail plug is attached to the rear end opening of the ink accommodating tube 32 , and the tail plug is provided with a ventilation hole for allowing the ink accommodating tube 32 to ventilate to the outside. Inside the pen tip 31 is accommodated a spring that presses the ball at the tip forward. The spring has a structure in which a rod portion is provided at the front end portion of the compression coil spring, and the front end of the rod portion is in contact with the rear surface of the ball. When not writing, the ball is in close contact with the inner surface of the inward tip edge portion of the tip of the ballpoint pen tip by the forward force of the spring, preventing ink leakage and ink evaporation from the tip of the pen tip 31 .

·Cylinder

The cylindrical body 2 includes a front thin cylindrical front shaft 2a, a cylindrical intermediate shaft 2b connected to the rear end of the front shaft 2a, and a cylindrical rear shaft connected to the rear end of the intermediate shaft 2b 2c. An axially extending sliding hole 22 is formed in the side wall of the cylindrical body 2 (eg, the side wall of the intermediate shaft 2 b and the side wall of the rear shaft 2 c ). A mounting hole 23 is provided axially through the rear end of the cylindrical body 2 (ie, the rear end of the rear axle 2c). A friction body 7 made of an elastic material is press-fitted into the mounting hole 23 . The friction body 7 is fixed to the outer surface of the rear end of the rear axle 2c (the cylinder body 2 ) without interlocking with the axial movement of the operation part 4 . The friction body 7 and the operation part 4 are provided independently. In addition, the cylindrical body of the present invention may be a cylindrical body such as a pen cover of a writing instrument.

·Bulges inwards

An annular inward protrusion 24 is integrally formed on the inner peripheral surface of the mounting hole 23 . The inward projection 24 has a guide portion 24a formed of an inclined surface (ie, a conical surface) whose inner diameter gradually decreases as it approaches the front. In addition, the inward projection 24 has a front end surface formed of a surface perpendicular to the axis in front of the guide portion 24a. A minimum inner diameter portion 24b formed by an acute-angled corner portion is formed between the guide portion 24a and the front end surface.

·In and out of agencies

The in-out mechanism is a side-sliding in-out mechanism using a rotating cam mechanism. The in-out mechanism includes a cam portion formed on the inner surface of the intermediate shaft 2b, a rotating member 5 engaged with the cam portion and abutting against the rear end of the pen body 3, and engaged with the rotating member 5 and extending from the sliding hole 22. The operation part 4 protruding radially outward, and the elastic pressing body 6 (for example, a compression coil spring) which is accommodated in the cylindrical body 2 and urges the pen body 3 rearwardly. The entry-exit mechanism of the present embodiment is a double-tap mechanism in which the operation part 4 is slid forward in both the protruding operation of the pen tip and the entering operation of the pen tip. The rotating member 5 is formed of a molded body of synthetic resin (eg, polyacetal resin).

The cam portion includes a plurality of serrated cam teeth protruding forward, and a plurality of cam grooves formed between the cam teeth and extending in the axial direction. The rotating member 5 includes, on the outer surface thereof, a plurality of (for example, four) protrusions extending in the axial direction, and the protrusions are engaged with the cam teeth of the cam portion and the cam grooves of the cam portion. At the front end of the shaft portion 43 of the operating portion 4, cam teeth that engage with the rear end of the protrusion of the rotating member 5 are formed integrally or by attachment of a separate member.

·Operation Department

The operating portion 4 includes an operating base portion 41 that protrudes radially outward from the sliding hole 22 extending in the axial direction of the side wall of the cylindrical body 2 . In addition, the operation part 4 includes: a shaft part 43 connected to the operation base part 41 and accommodated in the cylindrical body 2 so as to be able to move in the axial direction; Front connection settings. The clip portion 44 can hold clothes such as pockets. The operation portion 4 is formed of a molded body of synthetic resin (eg, polycarbonate resin). A ball portion 42 is protruded from the inner surface (inner surface) of the clip portion 44 . The operation base 41 and the shaft part 43 , the operation base 41 and the clip part 44 , and the clip part 44 and the ball part 42 are respectively formed by one component integrally formed or formed by assembling two independent components.

The operation base 41 can move axially along the sliding hole 22 . By pressing the operation base 41 forward, the pen tip 31 of the pen body 3 can be freely inserted and withdrawn from the front end hole 21 of the cylindrical body 2 .

·In and out of the nib

When the operation base 41 of the operation part 4 is slid forward from the pen tip entry state against the rearward urging force of the pressing body 6 , the rotation member 5 is pressed forward by the cam teeth of the shaft part 43 of the operation part 4 . The protrusion of 5 moves forward along the cam groove, and as the rotating member 5 presses the rear end of the pen body 3 forward, the pen tip 31 protrudes from the front end hole 21 to the outside. At this time, since the cam teeth of the shaft portion 43 come into contact with the protrusions of the rotating member 5 , the rotating member 5 is rotated by a certain angle with respect to the cam portion. As a result, the protrusions of the rotating member 5 are engaged with the cam teeth of the cam portion, and the protruding state of the pen tip is maintained.

When the operation base 41 of the operation part 4 is slid forward from the protruding state of the pen tip, the shaft part 43 of the operation part 4 presses the rotation member 5 forward, and the cam teeth of the shaft part 43 and the protrusions of the rotation member 5 press forward. By contacting, the rotating member 5 rotates by a certain angle with respect to the cam portion. Thereby, the engagement state of the protruding bar and the cam teeth of the cam portion is released, and the protruding bar is moved rearward along the cam groove of the cam portion by the backward biasing force of the biasing body 6 . Along with the backward movement of the rotating member 5, the pen body 3 moves backward, and the pen tip enters a state.

· Friction body

The friction body 7 includes a large-diameter portion 72 and a small-diameter portion 74 integrally connected and provided in front of the large-diameter portion 72, and is integrally formed of an elastic material. In this embodiment, the friction body 7 is a friction discoloration member that wipes the surface of thermochromic handwriting to thermally discolor the handwriting.

The friction body 7 is formed with an outward protrusion 75 on the outer peripheral surface, and the outward protrusion 75 is locked with the inward protrusion 24 in the front-rear direction. The friction body 7 is provided with a large-diameter portion 72 protruding axially rearward from the rear end of the cylindrical body 2, and the friction body 7 is inserted into the attachment so as to be rotatable around the axis. In the hole 23, the outer surface of the large diameter portion 72 is non-circular in cross section. As a result, even if the cylindrical body 2 is provided with protrusions such as jigs and anti-rotation protrusions, the user's gripping method and gripping position may be restricted, and friction can be quickly started at the portion of the friction body 7 that the user intends to use operate. In other words, in the case where the friction body 7 is not rotatably inserted, even if the friction body 7 is rubbed at the part of the friction body 7 that the user intends, the protrusions such as the clamp or the anti-rotation protrusion prevent proper gripping, The rubbing operation cannot be started quickly.

FIG. 5 is an enlarged view of the writing instrument 1 (friction body 7 ) according to the first embodiment of the present invention, and FIG. 6 is a perspective view of FIG. 5 . As shown in FIGS. 5 and 6 , when the friction body 7 is attached to the cylindrical body 2 (the rear axle 2 c ), the cross-sectional shape of the large-diameter portion 72 exposed from the cylindrical body 2 is substantially rectangular ( FIG. 5 ). (c)). Specifically, in the cross section, the apex of the rectangle is formed in a circular arc shape, and the curvature radius of the arc is larger than the curvature radius of the front end of the large diameter portion 72 of the friction body 7 . Therefore, the friction body 7 according to the first embodiment of the present invention has a substantially rectangular cross-section, and when rubbing is performed on the short side of the substantially rectangular shape of the transverse cross-section, the friction can be concentrated in a narrow range. When rubbing the long side of the substantially rectangular shape, a wide range can be quickly rubbed, so that the rubbing operation intended by the user can be performed. In addition, the cross-sectional shape is not limited to a substantially rectangular shape, and may be an ellipse, a quadrangle, a hexagon, or other polygons.

Preferably, the friction body 7 includes a small-diameter portion 74 integrally connected to the front from the large-diameter portion 72 and inserted into the mounting hole 23 , and the outer surface of the small-diameter portion 74 is round shape. Thereby, the friction body 7 can be stably mounted in the attachment hole 23 and the friction body 7 can be easily rotated, and the friction operation can be started quickly using the part of the friction body 7 intended by the user. However, providing an injection molding port or the like on the outer surface of the small-diameter portion 74 satisfies the above-mentioned structure and does not hinder the above-mentioned effects.

In addition, it is preferable that the friction body 7 has a base portion 77 formed on the outer peripheral surface of the rear end portion of the small-diameter portion 74 , and the base portion 77 of the small-diameter portion 74 and the inner peripheral surface of the opening edge of the mounting hole 23 are not in contact with each other during non-friction. touch. Thereby, the insertion resistance at the time of inserting the friction body 7 is reduced, and the assemblability is improved. In addition, when the friction body 7 is inserted into the mounting hole 23, the friction body 7 can be rotated more easily, and the friction operation can be quickly started using the part of the friction body 7 intended by the user.

Moreover, it is preferable to have the contact part 79 which the base part 77 of the said small diameter part 74 contacts the inner peripheral surface of the opening edge of the said attachment hole 23 when the paper surface 8 is rubbed. As a result, resistance is generated between the base portion 77 of the small diameter portion 74 and the inner peripheral surface of the opening edge of the mounting hole 23, and during friction, the friction body 7 does not unintentionally rotate around the axis, so it is possible to further The friction operation is performed using the portion of the friction body 7 intended by the user.

In addition, it is more preferable that a knob portion 78 for rotationally operating the friction body 7 is formed on the outer peripheral surface of the large diameter portion 72 of the friction body 7 . Thereby, the friction body 7 can be rotated further to the part of the friction body 7 intended by the user. Specifically, as for the knob portion 78 , the opposite side portion of a hexagon, an octagon, or the like capable of engaging a wrench, a knurled portion, or the like is a non-circular shape in cross section. In addition, the knob portion 78 has an anti-slip effect. In the first embodiment, the large-diameter portion 72 is provided with a pair of chamfered portions, and the friction body 7 can be more easily rotated by sandwiching the chamfered portions with fingers. However, when the large-diameter portion 72 itself of the friction body 7 is easily gripped with fingers and rotated, the large-diameter portion 72 itself functions as the knob portion 78 .

In addition, it is preferable that the cylindrical body 2 in which the friction body 7 is inserted is detachable with respect to the writing instrument 1 . Thereby, when the friction body 7 is worn out, the friction body 7 can be easily replaced with a new one. In addition, the user can select and replace the desired shape of the friction body 7 for use. The cylindrical body 2 which is detachable and has the friction body 7 inserted thereinto is attached to the writing instrument 1 through detachable screw connection or fitting.

In the present embodiment, the elastic material constituting the friction body 7 is preferably an elastic synthetic resin (rubber, synthetic rubber), for example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butylene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester fiber resin, EPDM, etc. The elastic synthetic resin constituting the friction body 7 is preferably made of low-abrasion properties that hardly generate abrasion debris (rubbing debris) during friction as compared with a material composed of a highly abrasive elastic material (eg, rubber, etc.). of elastic material.

·Large diameter

The rear surface of the large diameter portion 72 is convexly curved. A shoulder portion 73 which can be brought into contact with the open end of the attachment hole 23 (specifically, the rear end of the rear axle 2 c ) is formed at the front end of the large diameter portion 72 . The maximum outer diameter of the large diameter portion 72 is set larger than the inner diameter of the mounting hole 23 and smaller than the outer diameter of the rear end of the rear axle 2c.

·Small diameter

An annular outward projection 75 is integrally formed on the outer peripheral surface of the front end portion of the small diameter portion 74 . The outward projection 75 has a guide portion 75a formed of an inclined surface (ie, a conical surface) whose outer diameter gradually increases as it approaches the rear. The outward projection 75 has a rear end surface formed by a surface perpendicular to the axis. An acute-angled corner portion is formed between the guide portion 75a and the rear end surface. The corner portion becomes the largest outer diameter portion 75b in the outward projection 75 . That is, the outward projection 75 includes a guide portion 75a formed of an inclined surface whose outer diameter gradually increases toward the rear, and a maximum outer diameter portion 75b formed rearward of the guide portion 75a.

The maximum outer diameter of the outward protrusion 75 is set to be larger than the minimum inner diameter of the inward protrusion 24 and smaller than the inner diameter b of the mounting hole 23 behind the inward protrusion 24 . In the present embodiment, the maximum outer diameter of the outward projection 75 (ie, the outer diameter of the maximum outer diameter portion 75b) is set to 4.9 mm, and the minimum inner diameter of the inward projection 24 (that is, the inner diameter of the minimum inner diameter portion 24b) is set to 4.9 mm. Set at 4.1mm. The difference between the maximum outer diameter of the outward protrusion 75 and the minimum inner diameter of the inward protrusion 24 is preferably in the range of 0.5 mm to 2 mm (preferably 0.5 mm to 1 mm). Thereby, the friction body 7 can be reliably prevented from falling off, and the smooth passing between the outward protrusions 75 and the inward protrusions 24 can be achieved.

An axially extending inner hole 71 is formed inside the friction body 7 . The front end of the inner hole 71 is opened axially forward. The rear end of the inner hole 71 is located inside the large diameter portion 72 . Through the inner hole 71 , the friction body 7 is formed in a bottomed cylindrical shape with a closed rear end and an open front end. In this embodiment, the inner hole 71 is formed at least on the radial inner side of the outward protrusion 75 , so that the outward protrusion 75 can be easily elastically deformed radially inward when the outward protrusion 75 passes over the inward protrusion 24 . .

·Annular space

The outer diameter a of the middle portion of the small diameter portion 74 (ie, the portion between the outward projection 75 and the shoulder portion 73 ) is set smaller than the inner diameter b of the rear portion of the mounting hole 23 relative to the inward projection 24 . Therefore, when the outward protrusion 75 just before the outward protrusion 75 abuts against the inward protrusion 24 , the outer peripheral surface of the small diameter portion 74 behind the outward protrusion 75 is in contact with the inward protrusion 24 . An annular space 76 is formed between the inner peripheral surfaces of the mounting holes 23 rearward of the inward projections 24 . As shown in FIG. 2 , when the outward protrusion 75 is strongly pressed against the inward protrusion 24 just before the outward protrusion 75 passes over the inward protrusion 24 , even if the small diameter portion is located behind the outward protrusion 75 Since the annular space 76 is formed, the outer peripheral surface of the small-diameter portion 74 behind the outward projection 75 is not strongly press-contacted with the inner peripheral surface of the mounting hole 23. It does not become a resistance when the friction body 7 is inserted. As a result, it is possible to achieve a smooth transition between the outward protrusion 75 and the inward protrusion 24 . Specifically, the outer diameter a is set to 4.9 mm, and the inner diameter b is set to 5.6 mm.

·Axial clearance

As shown in FIG. 3, the axial length A from the shoulder portion 73 of the friction body 7 to the rear end of the outward projection 75 (ie, the maximum outer diameter portion 75b) is set to be slightly larger than that from the rear end of the rear axle 2c to The axial length B of the front end (ie, the smallest inner diameter portion 24b ) of the inward projection 24 of the mounting hole 23 (see FIG. 3 ). Therefore, when the outward protrusion 75 passes over the inward protrusion 24, even if it is difficult to slide between the outward protrusion 75 and the inward protrusion 24, the outward protrusion 75 can be reliably passed over the inward protrusion 24. . As shown in FIG. 3 , in the state where the insertion of the friction body 7 into the mounting hole 23 is completed, the rear end (ie, the largest outer diameter portion 75 b ) of the outward projection 75 is located more than the front end (ie, the smallest diameter portion 75 b ) of the outward projection 24 . At the front of the inner diameter portion 24 b ), an axial gap C is formed between the front end of the inward projection 24 and the rear end of the outward projection 75 . Specifically, the axial gap C is effective in a range of 0.05 mm to 1.0 mm (preferably 0.1 mm to 0.5 mm). Due to the size of the axial gap C, there is no large axial shaking when the friction body 7 is used, and the friction body 7 can be inserted between the inward protrusion 24 and the outward protrusion 75. Reliably crossed. In this embodiment, specifically, the axial length A is set to 8 mm, and the axial length B is set to 7.9 mm.

Furthermore, as shown in FIG. 3 , in the state where the crossing between the outward projection 75 and the inward projection 24 is completed, a shaft is formed between the rear end of the outward projection 75 and the front end of the inward projection 24 To the gap C. Therefore, even if it is difficult to slide between the outward protrusions 75 and the inward protrusions 24 , reliable passing between the outward protrusions 75 and the inward protrusions 24 can be achieved without applying lubricant or the like. In addition, in the state where the overshoot between the outward protrusion 75 and the inward protrusion 24 is completed, the inward protrusion 24 is press-contacted to the outer peripheral surface of the small diameter portion 74 rearward of the outward protrusion 75 . Thereby, the axial and radial backlash of the small diameter portion 74 can be prevented. In addition, the rear end of the rear axle 2c is press-contacted with the shoulder portion 73 in a state where the overshoot between the outward projection 75 and the inward projection 24 is completed. Thereby, the large-diameter portion 72 can be prevented from entering the mounting hole 23, and the radial backlash of the large-diameter portion 72 can be prevented.

According to the present invention, the pen tool 1 is formed with an inward projection 24 on the inner peripheral surface of the installation hole 23, and an outward projection 75 is formed on the outer peripheral surface of the friction body 7. The outward projection 75 and all the The inward projection 24 is locked in the front-rear direction, the friction body 7 includes a large-diameter portion 72 protruding axially rearward from the rear end of the cylindrical body 2, and the friction body 7 is capable of rotating with the shaft. The center is rotatably inserted into the mounting hole 23, and the outer surface of the large-diameter portion 72 is non-circular in cross section.

As a result, even if the cylindrical body 2 is provided with protrusions such as jigs and anti-rotation protrusions, the user's gripping method and gripping position may be restricted, and friction can be quickly started at the portion of the friction body 7 that the user intends to use operate.

<Second Embodiment>

A second embodiment of the present invention is shown in FIGS. 7 and 8 . This is a modification of the first embodiment, and differs from the first embodiment in the shape of the large-diameter portion 72 of the friction body 7 . The other structures and effects are the same as those of the first embodiment, so the description thereof is omitted.

FIG. 7 is an enlarged view of the writing instrument 1 (friction body 7 ) according to the second embodiment of the present invention, and FIG. 8 is a perspective view of FIG. 7 . As shown in FIGS. 7 and 8 , the friction body 7 is formed so that the large-diameter portion 72 exposed from the cylindrical body 2 in a state of being attached to the cylindrical body 2 (the rear axle 2 c ) has a substantially rectangular cross-sectional shape (( of FIG. 7 ). c)), compared with the cross-sectional rectangular shape of the first embodiment, the difference between the long side and the short side is larger. That is, compared with the first embodiment, the cross section is formed in a more elongated rectangular shape. Specifically, in the cross section, the apex of the rectangle is formed into a circular arc shape, and the curvature radius of the arc is larger than the curvature radius of the front end of the large diameter portion 72 of the friction body 7 . Therefore, the friction body 7 of the second embodiment of the present invention has a substantially rectangular shape in cross-section, and when rubbing is performed on the short side of the substantially rectangular shape in the transverse cross-section, the friction can be concentrated in a narrow range. When the long side of the substantially rectangular shape under the cross section is rubbed, a wide range can be quickly rubbed, and the rubbing operation intended by the user can be performed.

In addition, the friction body 7 of the second embodiment is formed into a more slender rectangular shape in cross section, and the large diameter portion 72 itself of the friction body 7 can be easily rotated by grasping the large diameter portion 72 itself with fingers. The function of the knob portion 78 is exerted.

<Third Embodiment>

A third embodiment of the present invention is shown in FIGS. 9 and 10 . This is a modification of the first embodiment, and differs from the first embodiment in the shape of the large-diameter portion 72 of the friction body 7 . The other structures and effects are the same as those of the first embodiment, so the description thereof is omitted.

FIG. 9 is an enlarged view of the writing instrument 1 (friction body 7 ) according to the third embodiment of the present invention, and FIG. 10 is a perspective view of FIG. 9 . As shown in FIGS. 9 and 10 , the friction body 7 is formed so that the large-diameter portion 72 exposed from the cylindrical body 2 in the state of being attached to the cylindrical body 2 (the rear axle 2 c ) has a substantially triangular cross-sectional shape (( of FIG. 9 ). c)). Specifically, in the cross section, the apex of the triangle is formed into a circular arc shape, and the radius of curvature of the arc is larger than the radius of curvature of the front end of the large diameter portion 72 of the friction body 7 . In addition, in the cross section, the sides of the triangle are formed in a slightly circular arc shape, and the radius of curvature of the arc is smaller than the radius of curvature of the front end of the large-diameter portion 72 of the friction body 7 . As a result, the friction body 7 of the third embodiment of the present invention has a substantially triangular shape in cross section. When friction is performed at the apex of the substantially triangular shape in the transverse cross section, the friction can be concentrated in a narrow range. When rubbing the sides of the substantially triangular shape in the cross section, a wide range can be quickly rubbed, and the rubbing operation intended by the user can be performed.

Moreover, as shown in FIG.9(c), the friction body 7 of 3rd Embodiment is formed in the front part of the large diameter part 72 of the friction body 7, and the knob part 78 whose cross section is a hexagon is formed. Thereby, the friction body 7 can be rotated more easily.

<Fourth Embodiment>

A fourth embodiment of the present invention is shown in FIGS. 11 and 12 . This is a modification of the first embodiment, and differs from the first embodiment in the shape of the large-diameter portion 72 of the friction body 7 . The other structures and effects are the same as those of the first embodiment, so the description thereof is omitted.

FIG. 11 is an enlarged view of the writing instrument 1 (friction body 7 ) according to the third embodiment of the present invention, and FIG. 12 is a perspective view of FIG. 11 . As shown in FIGS. 11 and 12 , the friction body 7 is formed so that the large-diameter portion 72 exposed from the cylindrical body 2 in the state of being attached to the cylindrical body 2 (the rear axle 2 c ) has a substantially triangular cross-sectional shape (( of FIG. 11 ). c)). Specifically, in the cross section, the apex of the triangle is formed into a circular arc shape, and the radius of curvature of the arc is larger than the radius of curvature of the front end of the large diameter portion 72 of the friction body 7 . In addition, in the cross section, the sides of the triangle are formed in the shape of a circular arc, and the radius of curvature of the arc is smaller than that in the third embodiment. As a result, the friction body 7 of the fourth embodiment of the present invention has a substantially triangular shape in cross section, and when rubbing is performed at the apex of the substantially triangular shape in the transverse cross section, the friction can be concentrated in a narrow range. When rubbing the sides of the substantially triangular shape in the cross section, a wide range can be quickly rubbed, and the rubbing operation intended by the user can be performed.

Further, in the friction body 7 of the fourth embodiment, a knurled portion is formed on the front portion of the large diameter portion 72 of the friction body 7 . Thereby, the friction body 7 can be rotated more easily.

Claims (10)

1. A pen tool, wherein a mounting hole opened rearward of an axis is provided at a rear end portion of a barrel of a pen holder or a shaft barrel of the pen tool, and a friction body made of an elastic material is inserted into the mounting hole,

an inward protrusion is formed on an inner peripheral surface of the mounting hole, an outward protrusion is formed on an outer peripheral surface of the friction body, the outward protrusion and the inward protrusion are locked in a front-rear direction, the friction body includes a large diameter portion protruding from a rear end of the cylindrical body in an axial direction, the friction body is rotatably inserted into the mounting hole around an axis, and an outer surface of the large diameter portion has a non-circular shape in a cross section.

2. The pen of claim 1,

the friction body is provided with a small-diameter part which is integrally connected with the front of the large-diameter part and is inserted into the mounting hole, and the outer surface of the small-diameter part is circular in cross section.

3. The pen of claim 2,

a base portion is formed on an outer peripheral surface of a rear end portion of the small diameter portion, and the base portion is not in contact with an inner peripheral surface of an opening edge of the mounting hole during non-rubbing.

4. The pen tool of claim 3,

the pen tool has a contact portion where the base portion contacts an inner peripheral surface of an opening edge of the mounting hole during rubbing.

5. The pen tool according to any one of claims 1 to 4,

a knob portion for rotating the friction body is formed on an outer peripheral surface of the large diameter portion.

6. The pen tool according to any one of claims 1 to 4,

the outer surface of the large diameter portion is rectangular in cross section.

7. The pen tool according to any one of claims 1 to 4,

the outer surface of the large diameter portion is triangular in cross section.

8. The pen of claim 7,

the vertex of the triangle is arc-shaped, and the side of the triangle is arc-shaped.

9. The pen tool according to any one of claims 1 to 4,

the cylinder body inserted with the friction body is freely assembled and disassembled relative to the pen.

10. The pen tool according to any one of claims 1 to 4,

the maximum outer diameter of the outward protrusion is larger than the minimum inner diameter of the inward protrusion, and the maximum outer diameter of the outward protrusion is smaller than the inner diameter of the mounting hole behind the inward protrusion.

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