JP2002225483A - Grip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the conventional problem that a finger slippage occurs or a pain is felt on the palm side of a finger depending upon the size of a knurl, that is, a writer has a feel of incongruity with an uncomfortable touch of the grip during writing so that the grip is not suitable for a practical use and therefore, there is still room for further development of a new grip. SOLUTION: This grip is provided on a barrel and has a knurled surface, the pitch of the knurls being 0.4 to 0.7 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grip provided on a shaft such as a writing instrument, and more particularly to a surface treatment of a grip.

[0002]

2. Description of the Related Art An example is described in Japanese Utility Model Laid-Open No. 57-129687. The publication describes a shaft cylinder composed of a front shaft and a rear shaft, and the surface of the front shaft includes:
A knurl pattern is printed or formed.

[0003]

However, knurls are preferred from a decorative point of view, but depending on the size of the knurls, the finger being gripped may slip on the barrel, In many cases, discomfort is felt at the time of writing, for example, pain may be felt in the belly, and there is nothing practically suitable, and there is still room for development.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a grip provided on a shaft body, wherein the surface of the grip is knurled and the knurl pitch is set to 0.4.
The point is that the distance is set to be from 0.7 mm to 0.7 mm.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A grip of a mechanical pencil will be described as an example, but is not limited thereto. resin,
Alternatively, a lead tank 2 is slidably disposed inside a metal barrel 1, and a chuck body for gripping / releasing the lead through a joint member 3 is provided at the front end of the lead tank 2. 4
Has been fixed. Also, in the front part of the chuck body,
A chuck ring 5 that opens and closes the chuck body 4 is bent. On the other hand, an eraser holder 6 is press-fitted and fixed to the rear portion of the core tank 2, and an eraser 7 is detachably fitted into the eraser holder 6. An eraser cover 8 is removably fitted in the eraser holder 6, and a cap member 9 for indicating the hardness of the core is rotatably fitted in the upper portion of the eraser cover 8. A metal front shaft 10 is mounted in front of the all-machine barrel 1 by means such as screwing. The front shaft 10 includes a grip portion 11 and a tip member portion 12 integrally formed in front of the grip portion 11. A center detent member 13 for preventing the drawn out core from retreating is press-fitted inside the tip member 12, and a metal core protection tube 14 is provided at the tip of the tip member 12. Although they are press-fitted, the core detent member and the core protection tube may be formed integrally with the tip member. In other words, it may be formed integrally with the front shaft. Reference numeral A is a metal clip, but it may be formed integrally with the barrel 1 by injection molding or the like.

Here, the grip portion 11 will be described in detail. Knurling 15 is applied to the surface of the grip 11.
Is given. Non-knurled portions 16 are formed at four radial positions of the grip portion 11. One piece of the knurl 15 has a rhombus shape, and the angle θ1 of the acute angle portion of the rhombus is formed at 60 degrees. An arc 17 is formed at the top and the valley of the knurl 15, and the arc has a radius of curvature of 0.06 mm.
The angles θ2 and θ3 between the top and the valley are formed at 90 degrees. Further, the distance (height) H from the valley to the top is formed to be 0.2 mm, and the pitch P of the knurl is formed to be 0.5 mm in this example. As described above, the allowable range is 0.4 mm to 0.7 mm. (See FIGS. 3 and 4.) In this example, the grip portion and the tip member are integrally formed. However, these components are formed as separate members, and the grip portion is formed as a stepped portion formed on the shaft cylinder. You may fix so that it may be pinched by a member.

Embodiment 1 The outer diameter of the grip portion 11 is 10 mm, and the pitch is 0.2 m.
The above-mentioned front shaft having a height of 0.2 mm and a height of 0.2 mm was prepared, and a sliding load when gripped and a feeling of touching a finger pad were tested. Note that the sliding load is defined by three fingers (thumb, thumb,
This is the load at the moment when the finger starts to slide against the grip part by holding the tip of the mechanical pencil against the spring balance in this state. In addition, the feel to the belly of the finger is pain felt in the belly of the finger.

Examples 2 to 9 were tested in the same manner as in Example 1 except that the knurl pitch was changed as follows. Example 2: pitch 0.3 mm Example 3: pitch 0.4 mm Example 4: pitch 0.5 mm Example 5: pitch 0.6 mm Example 6: pitch 0.7 mm Example 7: pitch 0.8 mm example 8: pitch 0.9 mm Example 9: pitch 1.0 mm

Comparative Example A writing instrument having a grip portion having an outer diameter of 10 mm and a pitch of 0 mm, that is, a writing instrument having a grip having a smooth surface was purchased. Tested. Hereinafter, Table 1 shows the test results of the above examples.

[0010]

[Table 1]

For the feel test, ten employees monitored and six persons judged that the test specimen which was favorable was a suitable value.

Further, in addition to the above test, a test in which the height H of the knurl was changed was also performed. Example 10 The outer diameter of the grip portion 11 is 10 mm, and the pitch is 0.4 m.
The above-mentioned front shaft having a height of 0.1 mm and a height of 0.1 mm was prepared, and a sliding load when gripped and a feeling of a finger pad were tested. Example 11 The outer diameter of the grip portion 11 is 10 mm, and the pitch is 0.4 m.
The front shaft having a height of 0.05 mm and a height of 0.05 mm was prepared, and a sliding load at the time of gripping and a feeling of a finger pad were tested. Example 12 The grip part 11 has an outer diameter of 10 mm and a pitch of 0.3 m.
The above-mentioned front shaft having a height of 0.1 mm and a height of 0.1 mm was prepared, and a sliding load when gripped and a feeling of a finger pad were tested. Example 13 The outer diameter of the grip portion 11 is 10 mm, and the pitch is 0.3 m.
The front shaft having a height of 0.05 mm and a height of 0.05 mm was prepared, and a sliding load at the time of gripping and a feeling of a finger pad were tested. Example 14 The grip part 11 has an outer diameter of 10 mm and a pitch of 0.8 m.
The above-mentioned front shaft having a height of 0.4 mm and a height of 0.4 mm was prepared, and a sliding load when gripped and a feeling of a finger pad were tested. Example 15 The outer diameter of the grip portion 11 is 10 mm, and the pitch is 0.8 m.
The front shaft having a height of 0.3 mm and a height of 0.3 mm was prepared, and a sliding load when gripped and a feeling of a finger pad were tested. Example 16 The outer diameter of the grip portion 11 is 10 mm, and the pitch is 0.7 m.
The above-mentioned front shaft having a height of 0.4 mm and a height of 0.4 mm was prepared, and a sliding load when gripped and a feeling of a finger pad were tested. Example 17 The outer diameter of the grip portion 11 is 10 mm, and the pitch is 0.7 m.
The front shaft having a height of 0.3 mm and a height of 0.3 mm was prepared, and a sliding load when gripped and a feeling of a finger pad were tested. Table 2 below
Shows the test results according to the above examples. In addition, the test of the touch is the same as that of Examples 1 to 9 and Comparative Example.

[0013]

[Table 2]

As can be seen from Table 2, when the height of the grip is less than 0.1 mm, the sliding load is remarkably reduced, and is about 1.5 kgf as in the comparative example. On the other hand, when the height H of the knurl exceeds 0.3 mm, the sliding load increases, but pain is felt on the belly of the finger.

Further, in addition to the above test, a test was performed in which the outer diameter of the grip portion was changed. Example 18 The outer diameter of the grip portion 11 is 9 mm, and the pitch is 0.4 m.
The above-mentioned front shaft having a height of 0.2 mm and a height of 0.2 mm was prepared, and a sliding load when gripped and a feeling of touching a finger pad were tested. Example 19 The outer diameter of the grip portion 11 is 8 mm and the pitch is 0.4 m.
The above-mentioned front shaft having a height of 0.2 mm and a height of 0.2 mm was prepared, and a sliding load when gripped and a feeling of touching a finger pad were tested. Example 20 The outer diameter of the grip portion 11 is 9 mm and the pitch is 0.3 m.
The above-mentioned front shaft having a height of 0.2 mm and a height of 0.2 mm was prepared, and a sliding load when gripped and a feeling of touching a finger pad were tested. Example 21 The outer diameter of the grip portion 11 was 8 mm and the pitch was 0.3 m.
The above-mentioned front shaft having a height of 0.2 mm and a height of 0.2 mm was prepared, and a sliding load when gripped and a feeling of touching a finger pad were tested. Example 22 The outer diameter of the grip portion 11 is 13 mm, and the pitch is 0.8 m.
The above-mentioned front shaft having a height of 0.2 mm and a height of 0.2 mm was prepared, and a sliding load when gripped and a feeling of touching a finger pad were tested. Example 23 The outer diameter of the grip portion 11 is 12 mm, and the pitch is 0.8 m.
The above-mentioned front shaft having a height of 0.2 mm and a height of 0.2 mm was prepared, and a sliding load when gripped and a feeling of touching a finger pad were tested. Example 24 The grip part 11 has an outer diameter of 13 mm and a pitch of 0.7 m.
The above-mentioned front shaft having a height of 0.2 mm and a height of 0.2 mm was prepared, and a sliding load when gripped and a feeling of touching a finger pad were tested. Example 25 The grip part 11 has an outer diameter of 12 mm and a pitch of 0.7 m.
The above-mentioned front shaft having a height of 0.2 mm and a height of 0.2 mm was prepared, and a sliding load when gripped and a feeling of touching a finger pad were tested. Table 3 below
Shows the test results according to the above examples.

[0016]

[Table 3]

As can be seen from Table 3, when the outer diameter is less than 9 mm, the sliding load is about 2.5 kgf and the pain on the finger pad despite the pitch being 0.4 mm. Was felt. It is presumed that, because of the thinness, a feeling of strongly gripping worked. Conversely, when the outer diameter exceeds 12 mm, the sliding load increases to about 5.5 kgf, but even when the pitch is 0.7 mm, pain on the finger pad can be felt.

[0018]

According to the present invention, there is provided a grip provided on a shaft body, wherein the surface of the grip is knurled, and the pitch of the knurl is 0.4 mm to 0.7 m.
m, it is possible to provide a grip with a good writing feel.

[Brief description of the drawings]

FIG. 1 is an external view showing an example of the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is an enlarged side view of a main part of the knurl.

FIG. 4 is a top view of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 core tank 3 Joint member 4 Chuck body 5 Chuck ring 6 Eraser holder 7 Eraser 8 Eraser cover 9 Cap member 10 Front shaft 11 Grip part 12 Tip member 13 Core detent member 14 Core protection tube 15 Knurl 16 Non-knurl Part 17 Arc

Claims (4)

[Claims] 1. A grip provided on a shaft body, wherein a knurling process is performed on a surface of the grip and a pitch of the knurl is set to 0.4 mm to 0.7 mm. 2. The height of the knurl is 0.1 mm or more.
The grip according to claim 1, wherein the grip is 0.3 mm. 3. The diameter of the grip is 9 mm to 12 mm.
The grip according to claim 1 or 2, wherein the grip is provided. 4. The grip according to claim 1, wherein a non-knurled portion is formed partially in a radial direction of the grip.