CN210132909U - Pen instrument - Google Patents

Abstract

Provided is a pen tool which can quickly start a rubbing operation using a portion of a rubbing body intended by a user. The pen (1) is provided with a mounting hole (23) which is opened backward along the axis at the rear end of the cylinder (2), and a friction body (7) made of elastic material is inserted into the mounting hole (23). An inward protrusion (24) is formed on the inner peripheral surface of the mounting hole (23), an outward protrusion (75) is formed on the outer peripheral surface of the friction body (7), and the outward protrusion (75) and the inward protrusion (24) are locked in the front-rear direction. The friction body (7) is provided with a large-diameter part (72) protruding from the rear end of the cylinder (2) to the rear in the axial direction, and the friction body (7) is inserted into the mounting hole (23) so as to be rotatable about the axial center. The outer surface of the large diameter portion (72) is non-circular in cross section.

Description

Pen instrument

Technical Field

The utility model relates to a pen. More specifically, the present invention relates to a pen instrument in which a mounting hole opened rearward with respect to an axis is provided at a rear end portion of a cylindrical body such as an axis tube or a cap of the pen instrument, and a friction member is inserted into the mounting hole.

Background

Patent document 1 describes a thermochromic pen having a friction member for erasing handwriting with thermochromic ink, the friction member having a cross section exposed at a rear end thereof in a polygonal shape such as a triangular shape, a rectangular shape, or a hexagonal shape.

Patent document 2 discloses a soft member mounting structure in which a mounting hole that opens axially upward is provided at an upper end portion of a tube body such as a barrel or a cap of a pen instrument, and a soft member is inserted into the mounting hole, wherein an inward protrusion is formed on an inner peripheral surface of the mounting hole, and an outward protrusion that passes over the inward protrusion from above downward is formed on an outer peripheral surface of the soft member.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-144933

Patent document 2: japanese patent laid-open publication No. 2007-144991

In the technique disclosed in patent document 1, before the rubbing operation is performed, the shaft tube needs to be rotated and held again while visually checking the orientation of the rubbing body, and the rubbing operation cannot be quickly shifted. In particular, if a projection such as a jig or a rotation prevention projection is provided on the shaft tube, a user may restrict a gripping method or a gripping position. 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 the portion of the friction member intended by the user.

Further, in the technique disclosed in patent document 2, a base portion having an inclined surface shape (i.e., a conical surface shape) whose outer diameter gradually increases as the soft member is moved upward is formed on an outer peripheral surface of a tip portion of a small diameter portion of the soft member (corresponding to a friction body of the present invention) (i.e., an outer peripheral surface of a portion where the small diameter portion of the soft member and a shoulder portion of the large diameter portion are connected). Therefore, even if the cross-sectional shape of the soft member is a polygonal shape, it may be difficult to wipe the soft member using the portion intended by the user.

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a pen capable of rapidly starting a rubbing operation using a portion of a rubbing body intended by a user.

In the present invention, "rear" means the side of the friction member in the entire pen, and "front" means the side opposite to the side of the friction member. In addition, the present invention is configured such that the "pen tip entering state" means a state in which the pen tip enters the barrel, and the "pen tip protruding state" means a state in which the pen tip protrudes to the outside from the front end hole of the barrel.

The utility model provides a pen tool is provided with to the axle to the rear end of the barrel of the axle tube of pen tool or pen socket the back tip of the barrel of the mounting hole is inserted and is equipped with the friction body that is formed by elastic material, a serial communication port the inner peripheral surface of mounting hole is formed with and is protruding inwards the outer peripheral face of friction body is formed with and is protruding outwards, protruding outwards with protruding upwards in the front and back direction stops, the friction body possesses the follow the convex major diameter portion of rear end to axial rear of barrel, and the friction body with can use the axle center as the center rotatory free mode cartridge in the mounting hole, the surface of major diameter portion is non-circular form under the cross section.

In addition, according to the above-described pen tool, the friction member includes a small diameter portion integrally connected forward of the large diameter portion and inserted into the mounting hole, and an outer surface of the small diameter portion has a circular shape in cross section.

Further, according to the above-described pen instrument, 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.

Further, according to the above-mentioned pen tool, the base portion is in contact with the inner peripheral surface of the opening edge of the mounting hole during rubbing.

In the above-described pen tool, a knob portion for rotating the friction member is formed on an outer peripheral surface of the large diameter portion.

In addition, according to the above-mentioned pen tool, an outer surface of the large diameter portion is rectangular in cross section.

In addition, according to the above-described pen tool, an outer surface of the large diameter portion is formed in a triangular shape in a cross section.

In the above-described pen tool, an outer surface of the large diameter portion has a triangular shape in cross section, a vertex of the triangular shape is arc-shaped, and a side of the triangular shape is arc-shaped.

Further, according to the above-described pen instrument, the cylinder to which the friction member is inserted is detachably attached to the pen instrument.

In addition, according to the above-described pen tool, a maximum outer diameter of the outward protrusion is larger than a minimum inner diameter of the inward protrusion, and the maximum outer diameter of the outward protrusion is smaller than an inner diameter of the mounting hole rearward of the inward protrusion.

According to the present invention, in the pen tool, the inner peripheral surface of the mounting hole is formed with the inward protrusion, the outer peripheral surface of the friction member is formed with the outward protrusion, the outward protrusion and the inward protrusion are engaged in the front-rear direction, the friction member is provided with the large diameter portion protruding from the rear end of the cylinder toward the axial rear direction, the friction member is rotatably inserted into the mounting hole with the axis as the center, and the outer surface of the large diameter portion is non-circular in cross section, whereby even if the cylinder is provided with the protrusion such as the clip or the rotation preventing protrusion, the holding method or the holding position of the user may be restricted, and the friction operation can be rapidly started using the portion of the friction member intended by the user.

According to the pen of the present invention, the rubbing operation can be rapidly started using the portion of the rubbing body intended by the user.

Drawings

Fig. 1 is a longitudinal sectional view of a pen according to a first embodiment of the present invention.

Fig. 2 is an enlarged longitudinal sectional view of a main portion of fig. 1.

Fig. 3 is an enlarged longitudinal sectional view of a main portion of fig. 1.

Fig. 4 is an enlarged longitudinal sectional view of a main part at the time of friction of fig. 1.

Fig. 5 (a) is an enlarged front view of a pen (frictional body) according to a first embodiment of the present invention. Fig. 5 (b) is an enlarged side view of the pen tool (frictional body) according to the first embodiment of the present invention. Fig. 5 (c) is a sectional view taken along line a-a of fig. 5 (a). Fig. 5 (d) is a sectional view taken along line B-B of fig. 5 (a).

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

Fig. 7 (a) is an enlarged front view of a pen (friction body) according to a second embodiment of the present invention. Fig. 7 (b) is an enlarged side view of a pen (friction body) according to a second embodiment of the present invention. Fig. 7 (C) is a cross-sectional view taken along line C-C of fig. 7 (a).

Fig. 8 is an enlarged perspective view of the pen (friction body) according to the second embodiment.

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

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

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

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

Description of the reference numerals

1, a pen tool; 2, a cylinder body; 2a front axle; 2b an intermediate shaft; 2c a rear axle; 21 a front end hole; 22 a slide hole; 23 mounting holes; 24 are raised inwards; 24a guide part; 24b a minimum inner diameter portion; 3, a pen body; a 31 nib; 32 ink accommodating tubes; 4 an operation part; 41 an operating base; a ball portion 42; 43 shaft portions; 44 a clamp portion; 5a rotating member; 6, a spring pressing body; 7 a friction body; 71 an inner hole; a 72 large diameter portion; 73 shoulder parts; a 74 small diameter part; 75 are convex outwards; 75a guide part; 75b a maximum outer diameter portion; 76 an annular space; 77 a base portion; 78 a knob portion; 79 contact portions; 8, paper surface; a length in an axial direction from a front end of the large diameter portion to a rear end of the outward protrusion; b the axial length from the rear end of the barrel to the front end of the inward projection; c, axial clearance; a the outer diameter of the middle part of the small diameter part; b inner diameter of the rear portion of the mounting hole that protrudes inward.

Detailed Description

Four embodiments of the present invention will be described below with reference to the drawings.

< first embodiment >

Fig. 1 to 6 show a first embodiment of the present invention.

The pen 1 of the present embodiment includes a cylinder 2, a pen body 3 accommodated in the cylinder 2, and an advancing and retracting mechanism for freely advancing and retracting a pen tip 31 of the pen body 3 from a front end hole 21 of the cylinder 2.

Pen body

The pen body 3 includes a pen tip 31, an ink containing tube 32 to which the pen tip 31 is press-fitted and fixed at a front end opening portion, a thermochromic ink 33 filled in the ink containing tube 32, and a follower 34 (for example, a high viscosity fluid) filled at a rear end of the thermochromic ink 33 and advancing with consumption of the thermochromic ink 33.

The pen tip 31 may be any structure including, for example, a metallic ball-point pen tip that rotatably holds a ball at its tip, or a synthetic resin pen tip holder that rotatably holds the outer surface of the rear portion of the ball-point pen tip. A tail plug having a vent hole for allowing the ink accommodating tube 32 to communicate with the outside is attached to the rear end opening of the ink accommodating tube 32. A spring for pressing the ball at the tip forward is housed in the pen tip 31. The spring is configured to have a rod portion at a front end portion of the compression coil spring, and a front end of the rod portion is in contact with a ball rear surface. When the pen is not writing, the ball is brought into close contact with the inner surface of the inward front end edge of the front end of the ballpoint pen tip by the forward biasing force of the spring, and ink leakage from the front end of the pen tip 31 and ink evaporation can be prevented.

Barrel body

The tubular body 2 includes a front thin cylindrical front shaft 2a, a cylindrical intermediate shaft 2b coupled to a rear end portion of the front shaft 2a, and a cylindrical rear shaft 2c coupled to a rear end portion of the intermediate shaft 2 b. Axially extending slide holes 22 are formed in the side walls of the cylinder 2 (for example, the side wall of the intermediate shaft 2b and the side wall of the rear shaft 2 c). A mounting hole 23 is axially provided through the rear end of the cylinder 2 (i.e., the rear end of the rear shaft 2 c). The friction body 7 made of an elastic material is press-fitted into the mounting hole 23. The friction member 7 is fixed to the rear end outer surface of the rear shaft 2c (the cylindrical body 2) without being interlocked with the axial movement of the operation portion 4. The friction body 7 and the operation portion 4 are independently provided. In addition, the barrel of the utility model can also be a barrel body such as a pen cap of a pen tool.

Inwardly projecting

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

An in-out mechanism

The in-out mechanism is a side-sliding type in-out mechanism using a rotating cam mechanism. The advancing and retracting 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, an operating portion 4 engaged with the rotating member 5 and protruding radially outward from the slide hole 22, and a biasing body 6 (e.g., a compression coil spring) accommodated in the cylinder 2 and biasing the pen body 3 rearward. The advancing and retracting mechanism of the present embodiment is a double click type mechanism in which the operation unit 4 is slid forward both in the pen tip projecting operation and in the pen tip advancing operation. The rotating member 5 is formed of a molded body of synthetic resin (e.g., polyacetal resin).

The cam portion includes a plurality of saw-toothed cam teeth projecting forward and a plurality of cam grooves formed between the cam teeth and extending in the axial direction. The rotary member 5 has a plurality of (for example, 4) projecting strips extending in the axial direction on the outer surface thereof, and the projecting strips are engaged with the cam teeth of the cam portion and the cam grooves of the cam portion. Cam teeth that engage with the rear ends of the ridges of the rotary member 5 are formed integrally with or attached to the front end of the shaft portion 43 of the operating portion 4.

Operation unit

The operation portion 4 includes an operation base 41 protruding radially outward from the axially extending slide hole 22 in the side wall of the cylindrical body 2. Further, the operation unit 4 includes: a shaft portion 43 which is connected to the operation base portion 41 and is axially movably accommodated in the cylinder 2; and a clip portion 44 connected forward to the operation base portion 41. The clip 44 can clip clothes such as a pocket. The operation portion 4 is formed of a molded body of synthetic resin (e.g., polycarbonate resin). A ball portion 42 is provided to protrude from the back surface (inner surface) of the clip portion 44. The operation base portion 41 and the shaft portion 43, the operation base portion 41 and the clip portion 44, and the clip portion 44 and the ball portion 42 are integrally formed by one member or assembled by two separate members, respectively.

The operation base 41 is axially movable along the slide hole 22. By pressing the operation base 41 forward, the pen tip 31 of the pen body 3 can be inserted into and removed from the front end hole 21 of the cylinder 2.

Advancing or retracting the nib

When the operation base 41 of the operation portion 4 is slid forward against the backward urging force of the elastic pressing body 6 from the pen tip entering state, the cam teeth of the shaft portion 43 of the operation portion 4 press the rotation member 5 forward, the protrusion of the rotation member 5 moves forward along the cam groove, and the rotation member 5 presses the rear end of the pen body 3 forward, and the pen tip 31 protrudes from the front end hole 21 to the outside. At this time, the cam teeth of the shaft portion 43 come into contact with the protrusions of the rotary member 5, and the rotary member 5 rotates by a predetermined angle with respect to the cam portion. Thereby, the projection of the rotary member 5 is engaged with the cam teeth of the cam portion, and the pen tip is maintained in a projecting state.

When the operation base 41 of the operation portion 4 is slid forward from the pen tip projecting state, the shaft portion 43 of the operation portion 4 presses the rotary member 5 forward, and the cam teeth of the shaft portion 43 come into contact with the projections of the rotary member 5, whereby the rotary member 5 rotates at a certain angle with respect to the cam portion. Thereby, the engagement between the protrusion and the cam teeth of the cam portion is released, and the protrusion moves rearward along the cam groove of the cam portion by the rearward biasing force of the biasing body 6. The pen body 3 moves backward with the backward movement of the rotary member 5, and the pen tip enters the state.

Friction body

The friction body 7 includes a large diameter portion 72 and a small diameter portion 74 integrally connected to the front of the large diameter portion 72, and is integrally formed of an elastic material. In the present embodiment, the frictional body 7 is a frictional color-changing member that thermally changes the color of the handwriting by wiping the surface of the thermally-changed handwriting.

The friction body 7 has an outward protrusion 75 formed on the outer peripheral surface thereof, and the outward protrusion 75 and the inward protrusion 24 are locked in the front-rear direction. The friction member 7 includes a large diameter portion 72 projecting axially rearward from the rear end of the cylinder 2, and the friction member 7 is inserted into the mounting hole 23 so as to be rotatable about the axial center, and the outer surface of the large diameter portion 72 is non-circular in cross section. Thus, even if the cylindrical body 2 is provided with a projection such as a jig or a rotation preventing projection, the gripping method or the gripping position of the user may be restricted, and the rubbing operation can be quickly started using the portion of the rubbing body 7 intended by the user. In other words, when the friction body 7 is not rotatably inserted, even if the friction body 7 is rubbed at a portion intended by the user, a protruding object such as a jig or a rotation preventing projection interferes with proper gripping, and the rubbing operation cannot be started quickly.

Fig. 5 is an enlarged view of the pen tool 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 fig. 5 and 6, the friction body 7 is formed such that the cross-sectional shape of the large diameter portion 72 exposed from the cylinder 2 is substantially rectangular in a state of being attached to the cylinder 2 (rear shaft 2c) (fig. 5 (c)). Specifically, the apex of the rectangle is formed in the shape of a circular arc in cross section, and the radius of curvature of the circular arc is larger than the radius of curvature of the tip of the large-diameter portion 72 of the friction body 7. Therefore, the cross section of the friction body 7 according to the first embodiment of the present invention is substantially rectangular, and when the short side of the substantially rectangular cross section is rubbed, the narrow range can be concentrated to rub, and when the long side of the substantially rectangular cross section is rubbed, the wide range can be rapidly rubbed, thereby enabling the rubbing operation intended by the user. The cross-sectional shape is not limited to a substantially rectangular shape, and may be an ellipse, a quadrangle, a hexagon, or another polygon.

Preferably, the friction member 7 includes a small diameter portion 74 integrally connected forward from the large diameter portion 72 and inserted into the mounting hole 23, and an outer surface of the small diameter portion 74 has a circular shape in cross section. This enables the friction member 7 to be stably attached to the attachment hole 23 and to be easily rotated, and thus, the friction operation can be quickly started using the portion of the friction member 7 intended by the user. However, the above-described configuration is also satisfied by providing an injection molding port or the like on the outer surface of the small diameter portion 74, and the above-described effects are not hindered.

In the friction body 7, it is preferable that a base portion 77 is formed on an outer peripheral surface of a rear end portion of the small diameter portion 74, and the base portion 77 of the small diameter portion 74 is not in contact with an inner peripheral surface of an opening edge of the mounting hole 23 in the non-friction state. This reduces insertion resistance when the friction body 7 is inserted, and improves assemblability. Further, when the friction body 7 is inserted into the mounting hole 23, the friction body 7 can be more easily rotated, and the friction operation can be quickly started using the portion of the friction body 7 intended by the user.

It is preferable that the base portion 77 of the small diameter portion 74 has a contact portion 79 that contacts the inner peripheral surface of the opening edge of the mounting hole 23 when rubbing the paper surface 8. Accordingly, 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 the friction body 7 does not unintentionally rotate about the axial center during friction, so that the friction operation can be further performed using the portion of the friction body 7 intended by the user.

Further, it is more preferable that a knob portion 78 for rotating the friction body 7 is formed on the outer peripheral surface of the large diameter portion 72 of the friction body 7. This enables the friction body 7 to be further rotated to the position of the friction body 7 intended by the user. Specifically, the knob portion 78 may be a hexagonal or octagonal counter portion or a knurled portion that can engage with a wrench, and may have 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 rotated more easily with fingers interposed between the chamfered portions. However, in the case of a shape in which the large diameter portion 72 itself of the friction body 7 is easily held with fingers and rotated, the large diameter portion 72 itself functions as the knob portion 78.

Preferably, the cylinder 2 with the friction body 7 inserted therein is detachable with respect to the pen 1. Thus, when the friction body 7 is worn, the new friction body 7 can be easily replaced. In addition, the user can select and change a preferred shape of the friction body 7 for use. The cylinder 2, to which the friction body 7 is detachably inserted, is attached to the pen 1 by a detachable screw or fitting.

In the present embodiment, the elastic material constituting the friction member 7 is preferably a synthetic resin (rubber, elastomer) having elasticity, and examples thereof include silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butylene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, Ethylene Propylene Diene Monomer (EPDM), and the like. The synthetic resin having elasticity constituting the friction body 7 is preferably formed of an elastic material having low abrasion which hardly generates abrasion debris (wiping debris) at the time of friction as compared with a material composed of an elastic material having high abrasion (for example, an eraser or the like).

Major diameter part

The rear surface of the large diameter portion 72 is a convex curved surface. A shoulder 73 that can abut against an opening end of the mounting hole 23 (specifically, a rear end of the rear shaft 2c) is formed at a front end of the large diameter portion 72. The maximum outer diameter of the large-diameter portion 72 is set to be larger than the inner diameter of the mounting hole 23 and smaller than the outer diameter of the rear end of the rear shaft 2 c.

Minor diameter portion

An annular outward projection 75 is integrally formed on the outer peripheral surface of the front end of the small diameter portion 74. The outward protrusion 75 has a guide portion 75a, and the guide portion 75a is formed of an inclined surface (i.e., a conical surface) whose outer diameter gradually increases toward the rear. The outward projection 75 has a rear end face constituted by a face perpendicular to the axis. An acute angle is formed between the guide portion 75a and the rear end surface. The corner becomes the largest outer diameter portion 75b of the outward protrusion 75. That is, the outward protrusion 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 75 a.

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 located rearward of the inward protrusion 24. In the present embodiment, the maximum outer diameter of the outward protrusion 75 (i.e., the outer diameter of the maximum outer diameter portion 75b) is set to 4.9mm, and the minimum inner diameter of the inward protrusion 24 (i.e., the inner diameter of the minimum inner diameter portion 24b) is set to 4.1 mm. 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 0.5mm to 2mm (preferably 0.5mm to 1 mm). This can reliably prevent the friction body 7 from falling off, and can realize smooth passing between the outward protrusion 75 and the inward protrusion 24.

An axially extending inner bore 71 is formed in the friction body 7. The front end of the inner hole 71 opens axially forward. The rear end of the inner hole 71 is located inside the large diameter portion 72. The friction body 7 is formed in a bottomed cylindrical shape with a closed rear end and an open front end by the inner hole 71. In the present embodiment, since the inner hole 71 is formed at least radially inward of the outward protrusion 75, the outward protrusion 75 is easily elastically deformed radially inward when the outward protrusion 75 moves over the inward protrusion 24.

Annular space

The outer diameter a of the intermediate portion of the small diameter portion 74 (i.e., the portion between the outward protrusion 75 and the shoulder 73) is set smaller than the inner diameter b of the mounting hole 23 at the rear side of the inward protrusion 24. Thus, when the outward protrusion 75 abuts against the inward protrusion 24 immediately before the outward protrusion 75 passes over the inward protrusion 24, an annular space 76 is formed between the outer peripheral surface of the small diameter portion 74 located rearward of the outward protrusion 75 and the inner peripheral surface of the attachment hole 23 located rearward of the inward protrusion 24. As shown in fig. 2, when the outward protrusion 75 is strongly pressed against the inward protrusion 24 before the outward protrusion 75 passes over the inward protrusion 24, even if the small diameter portion 74 located rearward of the outward protrusion 75 is elastically deformed to bulge radially outward, the outer peripheral surface of the small diameter portion 74 located rearward of the outward protrusion 75 is not strongly pressed against the inner peripheral surface of the mounting hole 23 due to the annular space 76, and thus the friction member 7 is not resistant to insertion. As a result, smooth passing between the outward protrusion 75 and the inward protrusion 24 can be achieved. Specifically, the outer diameter a is set to 4.9mm, and the inner diameter b is set to 5.6 mm.

Axial clearance

As shown in fig. 3, an axial length a from the shoulder 73 of the friction body 7 to the rear end of the outward protrusion 75 (i.e., the maximum outer diameter portion 75B) is set to be slightly larger than an axial length B from the rear end of the rear shaft 2c to the front end of the inward protrusion 24 of the mounting hole 23 (i.e., the minimum inner diameter portion 24B) (refer to fig. 3). Thus, when the outward protrusion 75 gets over the inward protrusion 24, even if sliding between the outward protrusion 75 and the inward protrusion 24 is difficult, the outward protrusion 75 can reliably get over the inward protrusion 24. As shown in fig. 3, in a state where the insertion of the friction body 7 into the mounting hole 23 is completed, the rear end (i.e., the maximum outer diameter portion 75b) of the outward protrusion 75 is located forward of the front end (i.e., the minimum inner diameter portion 24b) of the inward protrusion 24, and an axial gap C is formed between the front end of the inward protrusion 24 and the rear end of the outward protrusion 75. The axial clearance C is effective specifically in the range of 0.05mm to 1.0mm (preferably 0.1mm to 0.5 mm). The dimension of the axial clearance C prevents a large axial play when the friction body 7 is used, and ensures that the inward protrusion 24 and the outward protrusion 75 pass each other when the friction body 7 is inserted. In the present embodiment, specifically, the axial length a is set to 8mm, and the axial length B is set to 7.9 mm.

Further, as shown in fig. 3, in a state where the crossing between the outward protrusion 75 and the inward protrusion 24 is ended, an axial clearance C is formed between the rear end of the outward protrusion 75 and the front end of the inward protrusion 24. Thereby, even if sliding between the outward protrusion 75 and the inward protrusion 24 is difficult, reliable passing between the outward protrusion 75 and the inward protrusion 24 can be achieved without applying a lubricant or the like. In addition, in a state where the transition between the outward protrusion 75 and the inward protrusion 24 is completed, the inward protrusion 24 is pressed against the outer peripheral surface of the small diameter portion 74 located rearward of the outward protrusion 75. This prevents the small diameter portion 74 from wobbling in the axial and radial directions. In addition, in a state where the crossing between the inward projections 24 and the outward projections 75 is ended, the rear end of the rear shaft 2c is pressed against the shoulder 73. This can prevent the large diameter portion 72 from entering the mounting hole 23, and can prevent the large diameter portion 72 from rattling in the radial direction.

According to the utility model discloses, pen instrument 1 is formed with protruding 24 inwards at the inner peripheral surface of mounting hole 23 the outer peripheral face of friction body 7 is formed with protruding 75 outwards, protruding 75 outwards with protruding 24 upwards blocks in the front and back direction inwards, friction body 7 possesses from the protruding major diameter portion 72 of rear end to axial rear of barrel 2, and friction body 7 with can use the axle center to rotate freely mode cartridge in mounting hole 23 as the center, the surface of major diameter portion 72 is non-circular form under the cross section.

Thus, even if the cylindrical body 2 is provided with a projection such as a jig or a rotation preventing projection, the gripping method or the gripping position of the user may be restricted, and the rubbing operation can be quickly started using the portion of the rubbing body 7 intended by the user.

< second embodiment >

Fig. 7 and 8 show a second embodiment of the present invention. This is a modification of the first embodiment, and is different from the first embodiment in the shape of the large diameter portion 72 of the friction body 7. Other structures and operational effects are the same as those of the first embodiment, and therefore, the description thereof is omitted.

Fig. 7 is an enlarged view of a pen 1 (friction body 7) according to a second embodiment of the present invention, and fig. 8 is a perspective view of fig. 7. As shown in fig. 7 and 8, the friction member 7 is formed such that the cross-sectional shape of the large-diameter portion 72 exposed from the cylinder 2 in a state of being attached to the cylinder 2 (rear shaft 2c) is substantially rectangular ((c) of fig. 7), and the difference between the long side and the short side is larger than the rectangular cross-sectional shape of the first embodiment. That is, the cross section is formed in a more elongated rectangular shape than in the first embodiment. Specifically, the apex of the rectangle is formed in a circular arc shape in the cross section, and the radius of curvature of the arc is larger than the radius of curvature of the tip of the large diameter portion 72 of the friction body 7. Therefore, the friction body 7 according to the second embodiment of the present invention is substantially rectangular in cross section, and when the short side of the substantially rectangular in cross section is rubbed, it can be rubbed in a narrow range, and when the long side of the substantially rectangular in cross section is rubbed, it can be rubbed rapidly in a wide range, thereby performing a rubbing operation intended by the user.

The friction body 7 of the second embodiment is formed in a more slender rectangular shape in cross section, and is formed in a shape that can be easily rotated by holding the large diameter portion 72 itself of the friction body 7 with a finger, and the large diameter portion 72 itself functions as the knob portion 78.

< third embodiment >

Fig. 9 and 10 show a third embodiment of the present invention. This is a modification of the first embodiment, and is different from the first embodiment in the shape of the large diameter portion 72 of the friction body 7. Other structures and operational effects are the same as those of the first embodiment, and therefore, the description thereof is omitted.

Fig. 9 is an enlarged view of a pen 1 (friction body 7) according to a third embodiment of the present invention, and fig. 10 is a perspective view of fig. 9. As shown in fig. 9 and 10, the friction body 7 is formed such that the cross-sectional shape of the large diameter portion 72 exposed from the cylinder 2 in a state of being attached to the cylinder 2 (rear shaft 2c) is substantially triangular ((c) of fig. 9). Specifically, in the cross section, the apex of the triangle is formed in the shape of a circular arc having a radius of curvature larger than that of the tip of the large-diameter portion 72 of the friction body 7. In the cross section, the triangular side is formed in the shape of a slightly circular arc having a small radius of curvature at the tip of the large diameter portion 72 of the friction body 7. Thus, the friction body 7 according to the third embodiment of the present invention has a substantially triangular shape in cross section, and can perform friction in a narrow range when the apex portion of the substantially triangular shape in cross section is used for friction, and can perform friction in a wide range when the side of the substantially triangular shape in cross section is used for friction, thereby performing friction operation intended by the user.

As shown in fig. 9 (c), the friction body 7 of the third embodiment has a knob portion 78 having a hexagonal cross section formed at the front portion of the large diameter portion 72 of the friction body 7. This makes it easier to rotate the friction body 7.

< fourth embodiment >

Fig. 11 and 12 show a fourth embodiment of the present invention. This is a modification of the first embodiment, and is different from the first embodiment in the shape of the large diameter portion 72 of the friction body 7. Other structures and operational effects are the same as those of the first embodiment, and therefore, the description thereof is omitted.

Fig. 11 is an enlarged view of a pen 1 (friction body 7) according to a third embodiment of the present invention, and fig. 12 is a perspective view of fig. 11. As shown in fig. 11 and 12, the friction body 7 is formed such that the cross-sectional shape of the large diameter portion 72 exposed from the cylinder 2 in a state of being attached to the cylinder 2 (rear shaft 2c) is substantially triangular ((c) of fig. 11). Specifically, in the cross section, the apex of the triangle is formed in the shape of a circular arc having a radius of curvature larger than that of the tip of the large-diameter portion 72 of the friction body 7. In addition, in the cross section, the triangular side is formed in the shape of a circular arc, and the curvature radius of the circular arc is smaller than that of the third embodiment. Thus, the friction body 7 according to the fourth embodiment of the present invention has a substantially triangular shape in cross section, and can perform friction in a narrow range when the apex portion of the substantially triangular shape in cross section is used for friction, and can perform friction in a wide range when the side of the substantially triangular shape in cross section is used for friction, thereby performing friction operation intended by the user.

In the friction body 7 of the fourth embodiment, a knurled portion is formed in the front portion of the large diameter portion 72 of the friction body 7. This makes it easier to rotate the friction body 7.

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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