JPH11216985A - Grip attaching structure to barrel cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a product wherein a stripe pattern is not generated between a grip and a barrel cylinder, and the external appearance is favorable by a method wherein a satin finish treatment is applied on the surface of a part of the barrel cylinder of a writing utensil or the like, where the grip is fitted. SOLUTION: In the barrel cylinder 1 of a mechanical pencil, a lead feeding mechanism 5 comprising a lead tank 2, a chuck body 3, a chuck spring 4 or the like, is arranged, and at the rear end of the lead tank 2, an eraser 6 and a knock cap 8 on the top face of which a hole 7 is formed, are detachably attached. At a contracted part 10 which is formed on the front side of the barrel cylinder 1, a grip member 11 comprising a rubber-form elastic body is press-fitted, and in this case, a satin finish treatment is applied on the surface of the contracted part 10. The height of a fine unevenness on the satin finished area 12 is made approx. 30 μm, but it is acceptable as long as the height belongs a range of 10-60 μm. Then, the inner peripheral protuberance of the grip member 11 is engaged with a circumferential groove 13 being formed on the front end part of the contracted part 10, and the grip member 11 after being fitted, is prevented from dropping off from the barrel cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for attaching a grip to a shaft cylinder. Here, specific examples of the barrel include a barrel of a writing implement such as a sharp pencil or a ball pen, a barrel of a fishing rod, a knob of a window or a door, a handle of a bicycle or the like.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Hei 8-25875 is an example. This is an example in which a grip is inserted into a portion of a writing instrument to be gripped by a barrel. The claims of the utility model registration in the gazette include: "An aqueous solution of polyvinyl alcohol or hydroxyethyl cellulose is applied to the outside of the barrel of a writing instrument, and then the tubular body is press-fitted into the barrel. A method for mounting a tubular body in a writing instrument, characterized by being attached to a writing instrument. " By applying an aqueous solution having an adhesive property, the grip can be easily pressed into the cylindrical body, and after the press-fit, it is hard to rotate and hard to come off.

[0003]

The above-mentioned prior art has the above-mentioned effects, but it takes time and effort because the aqueous solution is applied to the barrel each time.
The cost of purchasing the aqueous solution is also high, resulting in high prices for the product. Further, although the cylindrical body seems to be in close contact with the shaft cylinder at first glance, in actuality, the entire contact surface is not evenly adhered, and there are an adhered portion and a non-adhered portion. ing. Here, when the cylindrical body is formed of a transparent or translucent member, the above-mentioned close contact portion and non-close contact portion are expressed as a mottled pattern, which is not good in appearance. In addition, even if the aqueous solution is dried, a mottled pattern due to the bonded portion and the non-bonded portion exists between the cylindrical body and the shaft cylinder, which further deteriorates the appearance. Was.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has a gist that a matte finish is applied to a surface of a portion of a barrel to which a grip is inserted.

[0005]

FIG. 1 to FIG. 3 show a first example. Shar
This is an example of a pencil. Inside the barrel 1 is a core tank 2
A centering mechanism 5 including a chuck body 3, a chuck body 3, and a chuck spring 4 is slidably disposed. An eraser 6 and a knock cap 8 having a hole 7 formed on the top surface are detachably attached to the rear end of the core tank 2 of the core feeding mechanism 5. Reference numeral 9 denotes a metal clip attached to the upper part of the barrel 1.

A reduced diameter portion 10 is formed at a front portion of the barrel 1, and a grip member 11 made of a rubber-like elastic body is press-fitted into the reduced diameter portion 10. Also, the reduced diameter portion 1
The surface of No. 0 is subjected to satin finish (the satin portion 1
2) The height of the fine unevenness in the satin portion 12 is 3
Although it is about 0 μm, it only has to be in the range of about 10 μm to 60 μm. A circumferential groove 13 is formed at a substantially front end of the reduced diameter portion 10.
Is engaged with the inner peripheral projection 14 of the grip member 11. This prevents the grip member 11 from dropping off the shaft cylinder 1 after insertion.

As a specific example of the satin finish, there is a method in which the barrel 1 is easily formed by injection molding. However, in the case where the barrel 1 is a soft product, a method such as blow molding may be used. good. Means for forming the satin finish 12 on the surface of the reduced diameter portion 10 of the barrel 1 includes the injection molding and the blow molding.
It is preferable to form fine irregularities on the inner surface of the cavity of the mold for molding the reduced diameter portion 10 by molding or the like by means of blasting or electric discharge machining. Table 1 below shows the ease of assembly and the evaluation of the appearance of mottled patterns when the height of the satin finished portion is variously changed.

[0008]

[Table 1]

×: adhered from the insertion start part,
Very difficult to insert. ×: Inserts up to about half of the reduced diameter part, but becomes difficult to insert as far back. ×: Mottled patterns appear in multiple places. Appears a little ×: The pearskin unevenness clearly appears

Next, specific examples of the material of the grip member 11 include a transparent material such as silicone rubber and ethylene propylene rubber, a thermoplastic elastomer, and a translucent material; A colored translucent material obtained by mixing a small amount of a coloring material into the above-mentioned material may be used. In particular, in consideration of a portion to be gripped by a hand (grip member), a silicone rubber, a thermoplastic elastomer, or the like that is resistant to oil or the like coming out of the hand is preferable.

[0011]

When the grip member is inserted into the shaft cylinder, that is, when the grip member is assembled, the inner surface of the grip member moves on the top of the fine unevenness of the reduced diameter portion of the shaft cylinder. Inserted into the box. Also, after insertion, since the grip member is placed on the top of the fine projection, the grip member and the reduced diameter portion do not come into surface contact, but point contact, so that a mottled pattern does not occur. . Also, since the inner surface of the grip member is in contact only with the convex top of the fine irregularities, the contact area is smaller than when the entire surface is in contact, so the color of the barrel is less likely to be reflected on the grip member, Therefore, although the grip member does not look the same color as the shaft cylinder and is transparent, the existence of the grip member can be easily confirmed, and the shape of the entire product is not spoiled. By the way, when a transparent grip member is inserted into a barrel that is not matte-finished, many parts are in close contact with the surface of the barrel, so the grip member looks the same as the color of the barrel, This impairs the presence of the member.

A second example will be described with reference to FIGS. The reduced diameter portion 10 of the barrel 1 has a satin finish (the satin portion 1) as in the previous example.
2) is applied, but the longitudinal rib 15 is also formed in the longitudinal direction. The rotation of the grip member 11 with respect to the barrel 1 after the grip member 11 is inserted is prevented. still,
In this example, the portion of the grip member that is in contact with the vertical ribs is darker in the color of the barrel than the other portions. But there is no mottled pattern. In the examples shown in FIGS. 2 and 4, the satin finish is not applied to the front portion (near the circumferential groove 13) of the reduced diameter portion to which the grip member is attached. May be.

[0013]

According to the present invention, since the surface of the portion of the barrel to which the grip is to be inserted is subjected to a satin finish, a mottled pattern is not produced between the grip and the barrel by inexpensive means, and the appearance is improved. Can provide good products.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first example of the present invention.

FIG. 2 is an enlarged view of a main part showing the barrel of FIG. 1;

FIG. 3 is a longitudinal sectional view showing the grip member of FIG. 1;

FIG. 4 is an enlarged view of a main part showing a second example of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 2 core tank 3 chuck body 4 chuck spring 5 core feeding mechanism 6 eraser 7 hole 8 knock cap 9 clip 10 reduced diameter portion 11 grip member 12 satin portion 13 circumferential groove 14 inner peripheral projection 15 vertical rib

Claims (1)

[Claims] 1. A grip attaching structure to a shaft cylinder, wherein a matte finish is applied to a surface of a portion of the shaft cylinder where a grip is inserted.