JPH11245575A - Structure for fitting grip on shaft cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a product as it is unnecessary to perform fitting work of a grip to a shaft cylinder and to provide a product wherein the shaft cylinder and the grip are not relatively moved for a long time. SOLUTION: A shaft cylinder 1 fitted with a grip 10 is provided and these shaft cylinder 1 and grip 10 are simultaneously molded in a manner of two-color molding or insert molding and the grip is fitted on the shaft cylinder 1 with a fine uneven hooking on the mutual contact face between the shaft cylinder 1 and the grip 10. In addition, the shaft cylinder 1 fitted with the grip 10 is provided and these shaft cylinder 1 and grip 10 are simultaneously molded in a manner of two-color molding or insert molding and when the simultaneous molding is performed, a structure wherein the grip is fitted on the shaft cylinder 1 by melting the outer face of the shaft cylinder 1 and the inner face of the grip 10 and bonding them together, is provided.

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]

In the above prior art, although the above-mentioned effects are obtained, an aqueous solution must be applied to the shaft cylinder and then the grip must be press-fitted.
The assembling work is troublesome, and the cost of purchasing the aqueous solution is also high, which results in a rise in the price of the product.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is directed to a shaft cylinder to which a grip is attached, wherein the shaft cylinder and the grip are formed by two-color molding or an insert. -Simultaneous molding in the same way as molding
A first object of the present invention is to provide a first aspect of the present invention, wherein a grip mounting structure is mounted on a shaft cylinder in which the shaft cylinder and the grip are engaged with each other at a fine contact between the contact surfaces. The cylinder and the grip are simultaneously molded in the manner of two-color molding or insert molding, and at the same time, the outer surface of the shaft cylinder and the inner surface of the grip are melted and adhered to the shaft cylinder. A second aspect of the present invention is a grip mounting structure.

[0005]

FIG. 1 to FIG. 3 show a first example. It is an example of a sharp pencil which is one of writing instruments. Inside the barrel 1, a lead-out mechanism 5 including a lead tank 2, a chuck body 3, a chuck spring 4, and the like is slidably disposed. An eraser 6 and a knock cap 7 are detachably attached to the rear end of the core tank 2 of the core feeding mechanism 5. Reference numeral 8 denotes a decorative ring attached to the upper part of the barrel 1, but a clip or the like may be attached. The above configuration is the same as the configuration of a general sharp pencil.

A reduced diameter portion 9 is formed at a front portion of the barrel 1, and a grip 10 made of a rubber-like elastic body is formed integrally with the barrel 1 by two-color molding at the reduced diameter portion 9. Is formed. Further, a large number of fine irregularities are formed on the surface of the reduced diameter portion 9 (irregularities 11), and the height from the bottom of the concave portion to the top of the convex portion in the irregularities 11 is 30 μm.
m, but if they belong to the range of about 10 μm to 60 μm, substantially the same effect can be obtained. Further, on the inner surface of the grip 10, a fine uneven portion 12 that engages with the uneven portion 11 of the reduced diameter portion 9 is similarly formed. A circumferential groove is formed substantially at the front end of the reduced diameter portion 10, and the inner circumferential projection of the grip 10 is engaged with the circumferential groove. By forming the front end of the grip 10 thick,
In addition to preventing "turning" from the front end during long-term use, it also improves flexibility when gripping.

Next, a molding method will be described. In general, two-color molding or insert molding is performed by injection molding. First, a mold for forming the barrel 1 (a primary mold including a cavity forming the outer shape of the barrel and a core pin forming the inside of the barrel), and a mold for forming the grip 10 ( And a secondary mold). In the present invention, since the mold for forming the grip 10 is formed by two-color molding, only a cavity is required, and a core pin is not required. Further, a fine concave-convex portion is formed at a portion where the reduced diameter portion 9 of the cavity forming the barrel 1 is formed. As a method of forming the fine irregularities, there are means such as blasting and electric discharge machining. Next, in the actual forming operation, first, the barrel 1 is formed by a primary mold that forms the barrel 1, and then the barrel 1 is formed while the barrel 1 is held by the core pin. The cavities are separated from each other, and then the grip 10 is formed by covering the barrel 1 with a secondary mold having the cavities forming the grips 10. At this time, since the fine concave and convex portions are formed in the reduced diameter portion 9 of the barrel 1 by the primary mold, the resin located on the inner surface of the grip is reduced in the process of forming the grip. It penetrates into fine irregularities of the diameter part 9.

Next, specific examples of the material of the barrel 1 include AS resin, ABS resin, POM resin, PS (polystyrene) resin, and PET (polyethylene terephthalate).
Resin, PBT (polybutylene terephthalate) resin, P
P (polypropylene) resin, PMMA (polymethacryl) resin, polymethylpentene, PC (polycarbonate) resin, PA (polyamide) resin, and the like. Specific examples of the grip 10 are the same as those of the material of the barrel 10. In addition to natural resins, it is also possible to select an elastic material such as styrene-butadiene elastomer, olefin elastomer, polyamide elastomer, polyester elastomer, polyurethane elastomer, urethane, EVA (ethylene vinyl acetate copolymer), or silicone resin. it can.

The material of the barrel 1 and the grip 10
And a material that can be melted during two-color molding and adhere to each other. Materials with different melting points may be selected, and even with the same material, materials with different grades may be selected. Incidentally, examples of preferable combinations of materials include an ABS resin and a styrene-based elastomer, a PC (polycarbonate) resin and a styrene-based elastomer, an ABS resin and a polyester-based elastomer, and a PC (polycarbonate) resin and a polyester-based elastomer. In this case, it is not necessary to form fine concave and convex portions in the cavity forming the barrel 1, and the labor and cost for processing the cavity can be reduced. The operation and effect described below are further improved.

[0010]

When the grip is formed, the grip is already attached to the barrel, not to mention that the barrel and the grip are formed by continuous molding. In addition, since the shaft cylinder and the grip are attached by fine concave and convex engagement or bonding, they do not move with each other, for example, do not rotate relative to each other or move in the longitudinal direction. .
"Flipping" due to peeling of the grip end is also prevented.

A second example will be described with reference to FIG. In addition to the above example, the reduced diameter portion 9 of the barrel 1 is formed with a circumferential or partial concave portion 13. On the other hand, a projection 14 is formed on the inner surface of the grip 10 so as to engage with the recess 13 during two-color molding or insert molding. The contact area between the reduced diameter portion of the barrel and the grip increases, and the above-described action is improved. In addition, since the grip is formed to be partially thick, the flexibility is improved and the usability is also improved.

A third example will be described with reference to FIGS. In addition to the first example, a plurality of diameter-reduced portions 15 having a small width on the circumference are formed, a through groove 16 is formed in each of the diameter-reduced portions 15, and a vertical groove 17 for communicating the through hole 15 is formed. This is an example formed on the inner surface of the barrel 1. On the other hand, on the inner surface of the grip 18, a projection 19 that engages with the through hole 15 at the time of two-color molding and a connection piece 20 to which the projections 19 are connected are formed. Compared with the previous example, since the grip 18 sandwiches the barrel 1, the grip 18 can be reliably prevented from falling off the barrel 1 as well as from moving with respect to the barrel 1.

A fourth example will be described with reference to FIGS. It is a modification of the third example. A plurality of through holes 21 are formed in the longitudinal direction of the barrel 1. The plurality of through holes 21 are formed at equal intervals in the circumferential direction of the barrel 1.
A longitudinal groove 22 is formed in the longitudinal direction of the inner surface of the barrel 1 so as to connect the through-holes 21 formed in the longitudinal direction. On the other hand, on the inner surface of the grip 23, a projection 24 that engages with the through hole 21 at the time of two-color molding and a connection piece 25 formed by the vertical groove 22 and connected to the projection 24 are formed. Is done. Since the plurality of grip portions can be deformed to the inside of the barrel, the flexibility is improved and the usability is further improved.

A fifth example will be described with reference to FIGS. This is an example in which a window hole 27 penetrating through the barrel 1 and the grip 26 is provided, and a knock piece 28 for operating the lead-out mechanism 5 described in the first example is arranged in the window hole 27. This is a so-called side knock type sharp pencil. Of course, also in this example, as shown in the first example, the barrel 1 and the grip 26
Are attached so that they do not engage with each other by fine irregularities on the contact surface, or move with an adhesive material. Further, in this example, the window hole 27 of the barrel 1 is used.
The window frame 29 which stands from the shaft cylinder 1 is formed. Rubbing due to the contact between the knock piece 28 and the grip 26 is prevented, and the effect of preventing the grip 26 from rotating with respect to the barrel 1 is also improved. Also, the shaft cylinder 1 of the grip 26
Therefore, the effect of preventing movement such as rotation with respect to the barrel 1 is also improved. However, if emphasis is placed on appearance, the inner surface of the window hole 27 of the grip 26 may be formed up to the vicinity of the side surface of the knock piece 28 without forming the window frame 29 as shown in FIG. In order to minimize the contact between the piece 28 and the window hole 27 of the grip 26, it is preferable to form a projection 30 inside the window hole of the barrel 1.

[0015]

According to the present invention, there is provided a shaft cylinder to which a grip is attached, wherein the shaft cylinder and the grip are formed simultaneously by two-color molding or insert molding. The first gist is a structure for attaching a grip to a shaft cylinder formed by engaging fine concaves and convexes on the contact surfaces of the shaft cylinder, and the shaft cylinder to which the grip is attached. Simultaneous molding is performed in the manner of two-color molding or insert molding. In the simultaneous molding, the outer surface of the shaft cylinder and the inner surface of the grip are fused and the grip mounting structure to the shaft cylinder is bonded. Since it is the gist of 2, there is no need to attach the grip to the barrel,
Therefore, a product can be provided at low cost, and a product in which the barrel and the grip do not relatively move for a long time can be provided.

[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 longitudinal sectional view of a main part showing a second example.

FIG. 3 is an enlarged longitudinal sectional view of a main part showing a third example.

FIG. 4 is an external perspective view of a third example.

FIG. 5 is an enlarged longitudinal sectional view of a main part showing a fourth example.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is an external perspective view showing a fifth example.

FIG. 8 is a sectional view taken along line BB of FIG. 7;

FIG. 9 is a view corresponding to FIG. 8, showing a modification of the fifth example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 core tank 3 Chuck body 4 Chuck spring 5 Core feeding mechanism 6 Eraser 7 Knock cap 8 Decorative ring 9 Reduced diameter part 10 Grip 11 Fine uneven part 12 Fine uneven part 13 Concave part 14 Convex part 15 Reduced diameter part 16 Through groove 17 Vertical groove 18 Grip 19 Projection 20 Connecting piece 21 Through hole 22 Vertical groove 23 Grip 24 Projection 25 Connection piece 26 Grip 27 Window hole 28 Knock piece 29 Window frame 30 Projection

Claims (5)

[Claims] 1. A shaft cylinder to which a grip is attached,
A shaft cylinder formed by simultaneously molding the shaft cylinder and the grip in the manner of two-color molding or insert molding, and engaging the shaft cylinder and the grip with each other on the contact surfaces of each other with fine irregularities. Grip mounting structure. 2. A shaft cylinder to which a grip is attached,
The shaft cylinder and the grip are formed simultaneously by two-color molding or insert molding, and at the same time, the outer surface of the shaft cylinder and the inner surface of the grip are melted and bonded together. Grip mounting structure. 3. The grip mounting structure to the barrel according to claim 1 or 2, wherein the grip is further engaged with an uneven portion larger than the fine unevenness. Construction. 4. The grip mounting structure for a barrel according to claim 1, wherein the grip is provided with a window hole passing through the barrel and the grip. Mounting structure. 5. The grip mounting structure according to claim 4, wherein the window cylinder has a window frame standing up from the shaft cylinder inside the window hole.