JP2605333Y2 - Writing instrument grip - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument grip.

[0002]

2. Description of the Related Art The pen shaft of a ballpoint pen, which is one of writing instruments, is usually made of synthetic resin such as plastic. For this reason, there is a problem that, when the ball-point pen is used for a long time, a finger sticks when the ball-point pen is used for a long time, or the ball-point pen slips due to sweating, so that it is difficult to use the ball-point pen.

[0003] An octopus is formed because the pen shaft is completely straight, whereas the finger of a person is not completely straight because the joints become thicker. Due to the grip portion of the pen not fitting well with the pen shaft. That is, an octopus tends to be formed particularly in a portion of the finger grip where pressure is concentrated.

[0004] The ballpoint pen slides because there is no catch between the pen shaft and the finger. In order to solve the above problem, it is conceivable to fit a cylindrical grip made of natural rubber or the like into the grip at the tip of the pen shaft. However, since the pen shaft is straight as described above, the grip may be lost during long use.

Further, in the conventional grip for a ball-point pen, since the cross-section is simply circular, even if the grip is made of elastic rubber, the contact with the part holding the ball-point pen with a finger such as a finger spherical surface can be prevented. , Because the surface (grip part) comes into contact with the point (grip with a circular cross section)
The pressure on the contact portion is still strong, and if used for a long time, the finger may hurt or octopus may occur.

[0006]

The problem to be solved by the present invention is based on the technical background described above. The problem is to prevent the grip from being displaced with respect to the pen shaft and to prevent the finger from being hurt even after a long use, and to cause an octopus. It is an object of the present invention to provide a ball-point pen grip that can be prevented from getting stuck.

[0007]

SUMMARY OF THE INVENTION A grip for a writing instrument according to the present invention solves the above problems and is as follows. In other words, the grip for a writing instrument according to claim 1 is a cylindrical anti-slip grip used for a writing instrument, wherein at least a part of the grip has a section having a large curvature and a section having a small curvature in a circumferential direction. Are arranged alternately in a shape such that non-adjacent ones of the large curvature portion and the small curvature portion are opposed to each other, and the curvature center of the small curvature portion has the large curvature of the opposite curvature. It is located at the vertex of the portion, and the center of curvature of the portion having the large curvature is located on the grip axis. Further, in the writing instrument grip according to the second aspect, the concave portion is formed in the portion having the large curvature.

[0008]

Therefore, according to the grip for a writing instrument of the first aspect, the grip has at least a partial cross-sectional shape in which a plurality of portions having a large curvature and a portion having a small curvature are alternately arranged in the circumferential direction. A large portion and a small curvature have a shape such that non-adjacent portions are opposed to each other, and the center of curvature of the small curvature portion is located at the apex of the opposed large curvature portion, and is located at the top of the large curvature portion. Since the center of curvature is on the grip axis, the portion of the grip having a small curvature has a smaller amount of outward projection from the grip axis than the portion having a large curvature. Therefore, a portion having a relatively small curvature becomes a concave portion, and a portion having a large curvature becomes a convex portion.

Therefore, if the size of the concave portion having a small curvature, which is the concave portion, is formed according to the finger of a standard size, the finger fits gently according to the curvature of the small portion. For this reason, the contact between the grip and the portion having the writing implement such as the finger spherical surface having the writing implement is face-to-face, so that the finger will not hurt even if used for a long time, and the octopus will not be able to be touched. Further, since the finger is accommodated in the concave portion, the concave portion acts as a finger catch.

According to the writing instrument grip of the second aspect, the concave portion is formed in a portion having a large curvature.
In addition, since the concave portion is fitted with a projection provided on a grip mounting portion of the pen shaft of the writing instrument to which the grip is mounted, the mounting of the grip on the pen shaft can be strengthened. Further, since the portion having a large curvature becomes a relatively convex portion as compared with the portion having a small curvature, the concave portion to be fitted with the projection provided on the grip mounting portion can be formed deeply. Therefore, the protrusion provided on the grip attachment portion can be enlarged in accordance with the deeply formed concave portion, so that the displacement of the grip with respect to the pen shaft is further enhanced.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a writing instrument grip according to the present invention; FIG.
FIG. 2 is a side view showing a state in which the writing instrument grip according to the present invention is applied to a ballpoint pen, which is one of the writing instruments. FIG. 2 is a side view of the grip, and FIG. 3 is a sectional view taken along line III-III of FIG.

The ball-point pen 1 has a mouth plug 2 made of a transparent material, and a pen shaft 3 integrated with the mouth plug 2. A cylindrical anti-slip grip 4 is provided on the pen shaft 3.
Is fitted to the grip mounting portion 3a.

The grip mounting portion 3a has a smaller diameter than other pen shaft portions, and is provided with one or more projections 6. When a plurality of protrusions 6 are formed, the protrusions 6 are provided so as to be scattered in the circumferential direction of the grip mounting portion 3a.

The grip 4A is made of a thermoplastic elastomer. Then, as can be seen from FIG. 3, the cross-sectional shape of at least a part thereof (the central part of the grip 4A) has a large curvature portion 10 ・ 10 ・ 10 and a small curvature portion 12 ・ 10 ・ 10.
12 and 12 are alternately arranged in the circumferential direction (in this embodiment, a portion 10 having a large curvature and a portion 1 having a small curvature).
2 ・ 12 ・ 12, three each, a total of 6) are arranged, and non-adjacent ones of the large curvature portion 10 ・ 10 ・ 10 and the small curvature portion 12 ・ 12 ・ 12 are opposed to each other. It has a shape like that.

[0015] Further, a portion 12/12 having a small curvature is provided.
The center of curvature of the corresponding large curvature 10.10.
10 is located at each vertex 13 and has a large curvature 1
The center of curvature of 0.10.10 is located on the grip axis 14. On the inner peripheral surface of the grip 4A, recesses 16, 16, 16 to be fitted with the projections 6 formed on the grip mounting portion 3a are provided with a portion 10 having a large curvature.
A total of three are provided, one for each of 10.10. For this reason, the grip mounting portion 3a of the pen shaft 3
, Three projections 6 are formed at regular intervals so as to fit into the recesses 16.

The projections 6.6.6 and the recesses 16.1.
By forming the protrusions 6 and 16 into protrusions and recesses extending in the longitudinal direction of the pen shaft 3, the engagement between the pen shaft 3 and the grip 4 can be further strengthened. In addition, tail 18
Before the screw is screwed onto the pen shaft 3, the ink core 20 is put into the pen shaft 3.

According to the writing instrument grip 1 using the grip 4A, the recesses 16, 16, 16 corresponding to the protrusions 6, 6, 6, 6 are formed in the grip 4, so that the grip 4A is connected to the pen shaft. If it fits in 3, the projections 6
6 and the recesses 16, 16
Is firmly fixed to the pen shaft 3.

Further, the grip 4A includes a portion 10.10.10 having a large curvature and a portion 12.12.1 having a small curvature.
2 are alternately arranged in the circumferential direction, and a portion having a large curvature 10 ・ 10 ・ 10 and a portion having a small curvature 12 ・ 12 ・ 12
Are non-adjacent ones facing each other, and the centers of curvature of the small curvature portions 12, 12, 12 are located at the respective vertexes 13 of the opposed large curvature portions 10, 10, 10. Part with large curvature 10.10
Since the center of curvature of 10 is located on the grip axis 14, the portion 12, 12, 12 of the grip 3 having a small curvature is located further outward from the grip axis 14 than the portion 10, 10, 10 having a large curvature. Protrusion amount is reduced. For this reason, the portions 12 12 having a relatively small curvature become concave portions,
Portions 10, 10, 10 having a large curvature become convex portions.

Therefore, if the size of the concave portion 12 having a small curvature, which is the concave portion, is formed in accordance with the finger having a standard size, the small portion 12 is formed.
The finger fits gently according to the curvature of. For this reason, the contact between the grip 3 and the portion having the ballpoint pen, such as the finger sphere, is face-to-face, so that it is possible to prevent the finger from being hurt or having an octopus even when used for a long time. Also, since the fingers are accommodated in the concave portions 12, 12, the portions 12, 12 and 12 having a small curvature, which are concave portions, function as the fingers being caught. Therefore, the pen shaft 3
Of the grip 3 can be prevented.

[0020] A recess 16 is fitted into the protrusion 6 provided on the grip mounting portion 3a of the pen shaft 3.
Since 16 ・ 16 is formed in a large curvature portion 10 ・ 10 ・ 10, a large curvature portion 10 ・ 10 ・ 10
Is considered to be a projection as described above,
6.16.16 can be formed deeply. Accordingly, the shape of the projection 6 can be made large in accordance with this, so that the displacement of the grip with respect to the pen shaft 3 can be further prevented.

In this embodiment, only the central portion of the grip 4A has a section 1 having a large curvature.
Although the shape is a combination of 0.10.10 and the small-curvature portions 12,12,12, the cross-section of the above-described shape may be formed in the entire grip 3.

[0022]

According to the writing instrument grip of the present invention, it is possible to prevent the grip from being displaced with respect to the pen shaft and to prevent the finger from being hurt or having an octopus even when used for a long time.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a writing instrument grip according to the present invention is applied to a ballpoint pen.

FIG. 2 is a plan view of a writing instrument grip according to the first embodiment.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

[Explanation of symbols]

 2 Mouth plastic 3 Pen shaft 3a Grip mounting part 4A Grip for writing implement 6 Projection 10 Part with large curvature 12 Part with small curvature 13 Apex of part with large curvature 14 Grip axis 16 Depression

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 54-122943 (JP, U) JP-A 62-128880 (JP, U) JP-A 3-72492 (JP, U) JP-A 7- 7985 (JP, U) Jiko 36-9703 (JP, Y1) Registered utility model 53292 (JP, Z1) Registered utility model 28690 (JP, Z2) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) B43K 23/008 B43K 3/00

Claims (2)

(57) [Scope of request for utility model registration] 1. A cylindrical anti-slip grip used for a writing instrument, wherein at least a part of the cross-sectional shape is:
A plurality of parts having a large curvature and a part having a small curvature are alternately arranged in the circumferential direction, and the large curvature part and the small curvature part have a shape such that non-adjacent parts are opposed to each other, The center of curvature of the small portion is located at the apex of the large portion of the opposite curvature, and the center of curvature of the large portion of the curvature is on the grip axis. 2. The writing device according to claim 1, wherein the portion having a large curvature is formed with a concave portion that fits into a projection provided on a grip mounting portion of the pen shaft of the writing instrument to which the grip is mounted. Grip for writing implements.