JP4873730B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument in which a tip member is detachably attached to a tip portion of a shaft tube, a small diameter portion is formed on an outer wall of the tip member, and a non-slip member made of an elastic body is attached to the small diameter portion. .

  2. Description of the Related Art Conventionally, a writing instrument in which a tip member is detachably attached to a tip portion of a shaft tube, a small diameter portion is formed on an outer wall of the tip member, and an anti-slip member made of an elastic body is attached to the small diameter portion is known. It has been.

Such writing instruments are disclosed in Japanese Utility Model Publication No. 05-29913, “Double-ended composite writing instrument” and Japanese Patent Application Laid-Open No. 2005-7584, “writing instrument”.
"Actual Publication No. 05-29913" "JP 2005-7584 A"

  However, as in Patent Document 1, simply by attaching an elastic body such as an O-ring to a groove formed in the base, a finger or the like comes into contact with the O-ring and a force is applied in the direction of the tip opening or in the opposite direction. In some cases, it moves and comes off the groove formed in the base.

  In addition, when a force is applied in the rear end direction of the shaft tube by forming an inclined surface in which the depth of the fixing groove increases toward the rear at the rear end of the groove formed in the base as in Patent Document 2. Although the movement could be prevented, the movement could not be prevented when a force was applied in the direction of the tip opening.

  In view of these problems, the present invention provides a writing instrument in which an anti-slip member made of an elastic body is attached to the outer wall of the tip member, and the anti-slip member does not move easily, and the anti-slip member is easily attached to the tip member. It is to provide a possible writing instrument.

  In the present invention, a tip member whose outer diameter is gradually reduced toward the tip is detachably attached to the tip portion of the shaft tube, and an anti-slip member made of an elastic body is attached to the outer wall of the tip member. A writing instrument in which a grip member is attached to a grip portion of the shaft cylinder, wherein grooves are provided at two different locations in the axial direction of the outer wall of the tip member, and the tip member is provided on the inner wall of the anti-slip member. A convex portion formed opposite to the two grooves is mounted, and the front end surface of the grip member is disposed in pressure contact with the rear end surface of the anti-slip member.

  Further, the front end outer diameter of the grip member and the rear end outer diameter of the anti-slip member are substantially the same, and the front end outer wall of the grip member and the rear end outer wall of the anti-slip member are formed continuously. To do.

In addition, the width of one convex portion of the anti-slip member is formed larger than the width of one opposing groove, and / or the inner diameter of one convex portion of the anti-slip member is the bottom of one opposing groove. It is formed smaller than the outer diameter of the wall, and one convex portion of the anti-slip member is press-fitted into and engaged with the one groove, and the width of the other convex portion of the anti-slip member is set to the other groove facing each other. And / or the inner diameter of the other convex portion of the anti-slip member is equal to or larger than the outer diameter of the bottom wall of the other groove facing the other anti-slip member. The other groove is engaged in a non-press-fit state.

Furthermore, the inner width of the two grooves is made larger than the inner width of the two protrusions, and the anti-slip member is mounted in an axially extending state, or the outer width of the two grooves is increased. It is smaller than the outer width of the two convex portions, and the anti-slip member is mounted in a compressed state in the axial direction.

  Still further, the anti-slip member is harder than the grip member.

  The present invention relates to a writing instrument in which an anti-slip member made of an elastic body is attached to the outer wall of the tip member, and the writing tool in which the anti-slip member does not move easily and can be easily attached to the tip member. Could be provided.

  Next, examples of the writing instrument of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.

Example 1
The writing instrument 1 according to the first embodiment shown in FIGS. 1 to 4 includes a front cylinder 2 and an internal cylinder 4 that are detachably screwed together, and a rear axis 3 that is attached so as to cover the internal cylinder 4 to form an axial cylinder body. Then, the internal thread portion 6a of the tip member 6 formed by cutting brass on the external thread portion 2a at the front end of the front shaft 2 is detachably screwed, and the grip portion of the front shaft 2 is molded in advance with silicone rubber. The grip member 5 is disposed. Further, a decorative ring 15 having a lens 16 is rotatably disposed between the grip member 5 and the rear shaft 3 and serving as a rolling prevention protrusion.

  In addition, the inner cylinder 4 is provided with a retracting mechanism comprising a rotating cam 11 formed of POM resin. This intruding mechanism is known in the art. Briefly, a cam groove (not shown) is formed on the inner wall surface of the inner body 4 for sliding and rotating the rotating cam 11 back and forth. A protrusion formed on the rotating cam 11 is engaged with the cam groove. At the rear end of the rotating cam 11, a push rod 10 having a cam portion for sliding the rotating cam 11 and imparting rotation is disposed, and a knocking body 8 is provided at the rear end thereof. It is a structure that is arranged in a state of projecting outward from the inner cylinder 4. A knock body cover 9 is attached to the knock body 8.

  In front of the rotating cam 11, a ball pen refill having a ball pen tip 13 that rotatably holds a ball at the tip of an ink containing tube 12 that contains ink for writing instrument (not shown) is placed behind the coil spring 14. The ball-point pen refill can be exchanged by urging the shaft 3 toward the rear end and slidably disposing the tip member 6.

  In order to use the knock type writing instrument 1, the knock body 8 is pressed to press the push rod 10, and the rotating cam 11 is advanced along a cam groove (not shown). The rotary cam 11 is rotated by the action, and the ball-point pen tip 13 can be used by protruding from the tip opening 6 b of the tip member 6. When the knock body 8 is further pressed, the rotating cam 11 is rotated by the action of the cam portion of the push rod 10, and the rotating cam 11 is moved back along the cam groove (not shown) by the biasing force of the coil spring 14. 13 can be immersive.

  In the tip member 6, grooves 6c and 6d are provided at two different locations in the axial center J direction, and the anti-slip member 7 is formed at a position facing the two grooves 6c and 6d of the tip member. The convex portions 7b and 7c are engaged and attached. Specifically, when the anti-slip member 7 is inserted from the front end side of the tip member 6, the convex portion 7 c on the rear end side of the anti-slip member 7 comes into contact with the outer wall of the tip member 6. Thereafter, when the anti-slip member 7 is pressed in the rear end direction (in the direction of arrow F in FIG. 3), the anti-slip member 7 formed of an elastic body moves in a direction in which the inner diameter of the convex portion 7c increases. Thereafter, the convex portion 7 b on the distal end side comes into contact with the outer wall of the tip member 6. Further, when the anti-slip member 7 is pressed in the direction of the rear end (in the direction of arrow F in FIG. 3), the inner diameter of the convex portion 7b moves so as to increase, and the original deformation is caused by elastic deformation at the position of the corresponding grooves 6d and 6d. Returning to FIG. 5, the convex portions 7b and 7c are engaged with the grooves 6c and 6d.

  Further, when the screw engagement between the tip member 6 and the front shaft 2 is finished, the front end surface 5a of the grip member 5 and the rear end surface 7a of the anti-slip member 7 are disposed in pressure contact (pressure contact amount t). Since no stepped portion or gap is formed in the elastic body region, the finger is surely brought into contact with the elastic region, and the anti-slip effect is improved. Furthermore, the outer wall of the grip member 5 and the non-slip member 7 is formed to be continuous with no step by making the outer diameter P of the grip member 5 and the rear end outer diameter p of the anti-slip member 7 substantially the same. Can be easily gripped, which is preferable.

  Thus, the grooves 6c and 6d are provided around the outer wall of the tip member 6 whose outer diameter is gradually reduced toward the tip opening 6b at two different locations in the axis J direction, and the two grooves 6c are provided. 6d is engaged with the projections 7b and 7c formed on the anti-slip member 7 so that the projections 7b and 7c can be applied even when a force is applied in the direction of the tip opening 6b or in the opposite direction during writing. The side wall surfaces 7e, 7f, 7g, and 7h can contact the side wall surfaces 6e, 6f, 6g, and 6h of the facing grooves 6c, 6d to prevent the anti-slip member 7 from moving, and the tip member 6 can be easily moved. The anti-slip member 7 can be attached to.

  Further, since the tip member 6 is screwed to the front shaft 2, it is easy to rotate (R direction and the opposite direction in FIG. 4) by attaching the anti-slip member 7 to the tip member 6 when tightening and removing. The occurrence of insufficient tightening of the tip member 6 during assembly is suppressed, and the exchangeability of the ballpoint pen refill is improved.

  In the present invention, the grip member and the anti-slip member are formed separately. However, although the number of assembling steps is increased as compared with the case where the grip member and the anti-slip member are integrally formed, individual mounting is easy. As a result, the assembling property is improved, and it is easy to form individual members and to easily attach and detach the tip member.

Further, the inner diameter N of the convex portion 7c on the rear end side of the anti-slip member 7 is made smaller than the outer diameter n of the bottom surface of the groove 6d on the rear end side of the tip member 6 (N <n). It is preferable to press-fit the end-side convex portion 7 c into the groove 6 d on the rear end side of the tip member 6 to improve the mounting force. In the present invention, grooves 6c and 6d are provided around two different places in the axial direction, and the protrusions 7b and 7c of the anti-slip member 7 are engaged with the grooves 6c and 6d. If one of them is press-fitted, a strong mounting force can be obtained even if the other is not press-fitted, so that the convex portion 7 b inner diameter M on the tip side of the anti-slip member 7 is a groove 6 c on the tip side of the tip member 6. Is equal to or greater than the bottom surface outer diameter m. Specifically, the diameter difference between the convex portion inner diameter N of one of the anti-slip members and the outer diameter n of the bottom surface of the groove of the tip member may be about 0.2 mm to 1 mm.

Also, the inner width g of the two grooves 6c, 6d is made larger than the inner width G of the two convex portions 7b, 7c of the anti-slip member 7, and the anti-slip member 7 is mounted in an axially extended state. Alternatively, the outer width h of the two grooves 6c, 6d is made smaller than the outer width H of the two protrusions 7b, 7c of the anti-slip member 7, and the anti-slip member 7 is mounted in a state compressed in the axial direction. The side walls of the projections 7b and 7c are in pressure contact with the side walls of the grooves 6c and 6d, so that the mounting force in the axial direction is improved and the anti-slip member 7 can be made difficult to move.

  The formation position of the groove of the tip member and the convex portion of the anti-slip member facing each other is not particularly limited as long as the position is different in the axial direction, but the convex portion is formed on the inner wall of the front end portion and the rear end portion of the anti-slip member. When the distance between the convex parts is increased, the one convex part is less affected by the spread of the other convex part when the inner diameter of the convex part is larger than that when the distance between the convex parts is short. Therefore, it is preferable because it becomes easy to spread. Further, as long as grooves are formed at least at two places, the number of grooves such as three places and four places is not particularly limited.

  In this embodiment, for the sake of convenience, an internal cylinder is disposed in the rear shaft, and the internal cylinder is provided with a cam groove (not shown), a retracting mechanism such as a rotating cam, etc. A cam groove (not shown) may be formed, and a retracting mechanism such as a rotating cam may be provided.

  The elastic body of the present invention is generally known such as elastically deformable silicone rubber, natural rubber, butyl rubber, fluorine rubber, vinyl chloride resin, butadiene rubber, urethane rubber, polyethylene resin, other synthetic rubbers, thermoplastic elastomers, and the like. The elastic body may be appropriately selected from the elastic bodies, but it is preferable to use silicone rubber in consideration of weather resistance, heat resistance, cold resistance, and the like. Furthermore, in consideration of wearability and grip feeling, it is most preferable to use a silicone rubber having a hardness (test method: JIS K6301, test condition: JIS-A type) of 20 to 70, preferably 30 to 50.

In order to improve the wearability of the slip member, it is preferable that the satin finished surface of at least the inner wall surface. Furthermore, when the grip member and the anti-slip member are in pressure contact, if the anti-slip member is deformed, the convex portion is easily detached from the groove, so that the hardness of the anti-slip member is preferably higher than the hardness of the grip member.

  In the embodiment, for convenience, the tip member is made of metal. However, the tip member is not limited to metal, and may be appropriately selected from materials generally known as tip members such as resin materials. That's fine.

  The writing instrument of the present invention is not limited to the type of the writing body, the knock type, and the cap type, and can be widely applied to a writing instrument in which the tip member is detachably attached.

It is a longitudinal cross-sectional view which shows the axial cylinder of the writing instrument of this invention. It is a principal part expanded sectional view in FIG. It is a figure which shows the front-end | tip member and anti-slip | skid member in FIG. It is the figure which abbreviate | omitted partially showing the state which screws the tip member in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Writing implement 2 Front shaft 2a Male thread part 3 Rear shaft 4 Internal trunk | drum 5 Grip member 5a Front end surface 6 Mouth member 6a Female thread part 6b Front end opening part 6c, 6d Groove 7 Anti-slip member 7a Rear end surface 7b, 7c Convex part 8 Knock body 8 Knock body cover 10 Push rod 11 Rotating cam 12 Ink receiving cylinder 13 Ball pen tip 14 Coil spring M, N Outer diameter of convex part m, n Inner diameter of groove P Rear outer diameter of non-slip member p Outer outer diameter of grip member t Pressure contact amount

Claims (5)

A tip member whose outer diameter gradually decreases toward the tip is detachably attached to the tip of the shaft tube, and an anti-slip member made of an elastic body is attached to the outer wall of the tip member. A writing instrument in which a grip member is attached to a gripping part, grooves are provided in two different locations in the axial direction of the outer wall of the tip member, and two tips of the tip member are provided on the inner wall of the anti-slip member. A writing instrument having a convex portion formed so as to face the groove, and a tip end surface of the grip member disposed in pressure contact with a rear end surface of the anti-slip member . The front end outer diameter of the grip member is substantially the same as the rear end outer diameter of the anti-slip member, and the front end outer wall of the grip member and the rear end outer wall of the anti-slip member are formed continuously. The writing instrument according to Item 1 . The width of one convex portion of the anti-slip member is formed larger than the width of one opposing groove, and / or the inner diameter of one convex portion of the anti-slip member is the bottom wall of one opposing groove. It is formed smaller than the outer diameter , and one convex portion of the anti-slip member is press-fitted into and engaged with the one groove, and the width of the other convex portion of the anti-slip member is set to the width of the other groove facing each other. And / or the inner diameter of the other convex portion of the non- slip member is equal to or larger than the outer diameter of the bottom wall of the other groove facing the other, and the other convex portion of the anti-slip member is the other convex portion. The writing instrument according to claim 1 or 2, wherein the writing instrument is engaged with the groove in a non-press-fit state . The inner width of the two grooves is made larger than the inner width of the two convex portions, and the anti-slip member is mounted in an axially extended state, or the outer width of the two grooves is The writing instrument according to any one of claims 1 to 3, wherein the writing tool is smaller than an outer width of the two convex portions, and the anti-slip member is mounted in a compressed state in the axial direction . The writing instrument according to any one of claims 1 to 4, wherein a hardness of the anti-slip member is harder than a hardness of the grip member .

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