JP2002001176A - Masking cap and method of masking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surly applying a mask on the end part of a rod like body to be simply attachable and detachable to the end part without easily dropping out at the time of surface treating the rod like body, on which a peripheral groove is formed. SOLUTION: In a plastic made masking cap 1 for protecting at the time of surface-treating the end part 23 of the rod like body 21, the peripheral groove 22 for mounting a ring is formed on the end 23 part of the rod like body 21 and a projecting part 4 engaged with the peripheral groove 22 is formed on the whole periphery or a part of the inner periphery of the masking cap 1. Because the masking cap 1 is made of a plastic and the projecting part 4 is engaged with the existing peripheral groove 22 of the rod like body 21, the masking cap 1 is easily attached and detached to surely mask the end part of the rod like body without easily dropping out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the case of applying a surface treatment such as painting or plating to a rod-shaped member such as a shaft of a rotating body having a circumferential groove for mounting a ring at one end or both ends. It relates to the masking cap used.

[0002]

2. Description of the Related Art Since a rod-shaped body such as a shaft of a rotating body is supported at its end by a bearing, it is necessary to mask the end of the rod-shaped body so that paint does not adhere to the end. There is. Conventionally, when masking the end of the rod-like body (21), a rubber or plastic cap (51) as shown in FIG. 8 is attached to the end (23).

[0003]

However, when the cap (51) is made of rubber, it has good adhesion but takes a lot of time to attach and detach due to frictional resistance. There is a problem in that the paint is not familiar with the body and is easily detached, and the paint easily enters through gaps.

[0004]

According to the present invention, there is provided a plastic masking cap (1) for protecting the end portion (23) of a rod-shaped body (21) during surface treatment. A circumferential groove (22) for mounting a ring (25) is formed at an end (23) of the rod-shaped body (21), and the entire circumference or a part of the inner circumference of the masking cap (1) is formed. The circumferential groove (2
An object of the present invention is to provide a masking cap (1) in which a projection (4) engaging with (2) is formed. The masking cap
(1) is desirably manufactured by vacuum forming a thermoplastic sheet. Further, the masking cap (1) is attached to the end (23) of the rod-shaped body (21) having the circumferential groove (22) during the surface treatment, and the projection (4) of the masking cap (1) is attached to the rod-shaped body. The masking cap (1) is fixed by engaging with the circumferential groove (22) of the body (21), and the rod-shaped body end (2
It is intended to provide a masking method for protecting during the surface treatment of 3).

[0005]

In general, a rod-shaped body (21) such as a shaft of a rotating body is inserted into the center of a rotating body (24) such as a roller body as shown in FIG. In this case, a ring (25) such as an E-ring is attached to both ends (23) of the rod-shaped body (21) in order to prevent the rotating body (24) from coming off.
Is formed in the peripheral groove (22). The masking cap (1) of the present invention has the rod-shaped body
(21) has a convex portion (4) which engages with the circumferential groove (22).
The projection (4) is attached to the end (23) of the (21), and the projection (4) is engaged with and fixed to the peripheral groove (22). Also, since the masking cap (1) is made of plastic, it has low friction and is moderately elastically deformed, so that it can be easily and securely attached by pushing it over the end (23) of the rod (21) and pulling it. Can be easily removed.

If the masking cap (1) is manufactured by vacuum forming a thermoplastic sheet, it can be produced simply and efficiently.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIGS. 1 to 5. The rod-shaped body (21) is a shaft rod of a roller (24) which is a rotating body of an electronic device or the like shown in FIG. E-ring mounting grooves (22), which are peripheral grooves (22), are formed at both ends of the rod-shaped body (21). Masking cap (1)
Represents the rod-shaped body (21) when the rod-shaped body (21) is subjected to surface treatment such as painting.
(21) is used to protect an end (23) of the rod-shaped body (21), and a protrusion (4) engaging with an E-ring (25) at the end of the rod-shaped body (21) is used. Are formed over the entire circumference. The protrusion
When (4) is formed over the entire inner circumference of the masking cap (1), the masking cap (1) is securely fitted and held by the rod-shaped body (21), and furthermore, the projection (4) To prevent intrusion of paint or the like from the engaging portion of the peripheral groove (22) and more reliably mask the protective surface.

The masking cap (1) is made of, for example, polystyrene, polyethylene, polypropylene, ethylene-
Propylene copolymer, polyvinyl chloride, vinylidene chloride copolymer, ethylene-vinyl acetate copolymer, thermoplastic resin such as thermoplastic polyester, polyamide, polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyphenylene ether, polyphenylene oxide Sheet of engineering plastics such as polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, polyetheretherketone, crystalline polyester, polyamideimide, polyimide, polyetherimide, polyaminobismaleimide, methylpentene copolymer, cellulose acetate, or A sheet of a mixture of two or more of the above plastics, or a product of two or more of the above plastic sheets It is formed by applying a vacuum forming or press forming or the like at the object.

[0009] Calcium carbonate,
Magnesium carbonate, barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, calcium hydroxide,
Magnesium hydroxide, aluminum hydroxide, magnesium oxide, titanium oxide, iron oxide, zinc oxide, alumina, silica, diatomaceous earth, dolomite, gypsum, talc, clay,
Asbestos, mica, calcium silicate, benite,
Inorganic fillers such as white carbon, carbon black, iron powder, aluminum powder, stone powder, blast furnace slag, fly ash, cement, zirconia powder, natural fibers such as cotton, bamboo, hemp, wool, polyamide fibers, polyester fibers, and acrylic fibers , Viscose fiber, acetate fiber, vinyl chloride fiber, organic synthetic fiber such as vinylidene chloride fiber, asbestos fiber, glass fiber, carbon fiber, ceramic fiber,
Metal fibers, inorganic fibers such as whiskers, linters, linen, sisals, wood flour, coconut flour, walnut flour, starch, organic fillers such as flour, and other reinforcing materials such as flour are added to maintain shape retention, dimensional stability, compression and You may improve the tensile strength, etc., furthermore, flame retardant, flame retardant, insect repellent, preservative, wax, lubricant, antioxidant, antioxidant, ultraviolet absorber, antistatic, crystallization accelerator , Chemical foaming agents, foaming agents such as capsule type foaming agents, coloring agents such as dyes and pigments, DOP, DBP
One or two or more plasticizers may be mixed.

In order to protect the end (23) of the rod (21) with the masking cap (1) in the surface treatment such as painting, as shown in FIG. The masking cap (1) is applied. At this time, the convex portion (4) of the masking cap (1) is aligned with the E-ring mounting groove of the rod-shaped body (21).
(22) is engaged and fixed. The masking cap (1)
Since it is made of plastic, it has low friction and it is elastically deformed moderately.
If (1) is put over the end of the rod (21) and pushed in, it can be easily attached. Then, the convex portion (4) is engaged with the E-ring mounting groove (22), and the masking cap (1) is securely fixed.

After the masking cap (1) is attached to the rod (21) in this manner, a surface treatment such as painting is performed. Since the convex portion (4) is provided along the entire circumference along the inner periphery, the end portion (23) of the rod-shaped body (21), which is to be masked, is securely sealed and does not fall off easily. Does not enter the end (23) which is the protective surface.

After the surface treatment, the masking cap (1) is pulled out of the rod (21) and removed. At this time, since the masking cap (1) is made of plastic, it is appropriately elastically deformed and can be easily removed. When the masking cap (1) is removed, it can be restored to its original shape and reused.

In addition to the above-described embodiment, for example, as shown in FIG. 6, the projection (4A) of the masking cap (1A) may be formed on a part of the inner periphery. As shown in FIG. 7, a reinforcing rib (2B) may be formed on the outer peripheral surface of the masking cap (1B).

[0014]

The masking cap of the present invention is made of plastic, and the projection formed on the inner periphery engages with the existing circumferential groove of the rod, so that it can be easily attached to and detached from the end of the rod, and easily. The end is securely masked without falling off. The masking material of the present invention can be efficiently produced by vacuum forming.

[Brief description of the drawings]

 1 to 5 show one embodiment of the present invention.

FIG. 1 is a perspective view

FIG. 2 is a side sectional view

FIG. 3 is a perspective view of a rod.

FIG. 4 is a side sectional view showing a masking cap fitted state.

FIG. 5 is a perspective view showing a state in which a rod is inserted into a roller.

FIG. 6 is a perspective view of another embodiment.

FIG. 7 is a perspective view of a conventional example.

FIG. 8 is a perspective view of a conventional example.

[Explanation of symbols]

 1 Masking cap 4 Convex portion 21 Rod 22 E-ring mounting groove (circumferential groove) 23 End

Claims (3)

[Claims] 1. A plastic masking cap for protecting an end of a rod during surface treatment, wherein a peripheral groove for mounting a ring is formed at the end of the rod. A masking cap characterized in that a convex portion that fits into the peripheral groove is formed on the entire circumference or a part thereof. 2. The masking cap according to claim 1, wherein said masking cap is manufactured by vacuum forming a thermoplastic sheet. 3. A masking cap according to claim 1, which is attached to an end portion of a rod having a peripheral groove during surface treatment, and a projection of the masking cap is engaged with the peripheral groove of the rod. By fixing the masking cap and protecting the end of the rod during surface treatment.