JPS632380Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a bicycle chain case.

Conventional bicycle chain cases have been constructed entirely of a material such as a steel plate, and therefore have the drawbacks of being relatively heavy and having an unsightly appearance. Furthermore, once the painted outer surface of the case is scratched, it appears as a continuous line, which is extremely noticeable and unsightly, and the chain case has to be replaced. Furthermore, in the case of a so-called full case type in which the entire chain and gears (referring to the chain wheel and freewheel; the same shall apply hereinafter) are enclosed, the slackness of the chain inside the case cannot be inspected from the outside due to its structure. It was very inconvenient.

In addition, in the case of a so-called half-case type in which only one side of the chain and gear is covered and the other side is open,
When washing off mud or the like adhering to the chain, the open side can be very easily washed with water from a hose or the like, but there is an inconvenience in that the side covered by the chain case cannot be washed with water.

The present invention eliminates the drawbacks of such conventional examples,
It helps to reduce the weight of the bicycle, makes it extremely easy to check the slackness of the chain, and makes it easy to wash mud adhering to the chain, gears, etc. from the outside, and scratches on the outside of the case are less noticeable. Moreover, it is an object of the present invention to provide a bicycle chain case that has a fresh and cool appearance that has not existed before, and that can be easily manufactured without making any changes to conventional manufacturing equipment.

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

A chain case 1 shown in the drawings is an example in which the present invention is applied to a so-called half-sided case that covers one side of most of the chain and gear.

The outer shape of the case body 2 is formed by press-molding a mesh-like plate material such as a punched metal 3 instead of a conventional thin plate material. That is, the case body 2 includes a side plate part 6a and a peripheral wall part 6 which is bent inwardly at a substantially right angle to the side plate part 6a by pressing.
b is entirely formed of punched metal 3, and a centerpiece 4 is formed in the front part, and a through hole 5 for inserting a chain stay is formed in the rear part.

In this embodiment, punching metal 3 is used as the mesh-like member, but the mesh-like plate material may have a mesh structure, and the size of the mesh may be determined as desired.

Although the chain case 1 of the embodiment of the present invention is a half-sided case, it is also possible to use a full case that encloses the entire chain and gears, or a 1/2 to 1/4 case that mainly covers the upper part of one side of the chain and chain wheels. It may be a half case that covers the

The present invention has the above-mentioned structure, and involves a novel structure in which the case body is formed of a mesh-like plate material, which was not found in conventional examples, and also allows the use of the conventional manufacturing technique of forming the case body by press molding. The mesh-like board material gives it a unique external appearance of coolness, freshness, smartness, and lightness. Furthermore, since the case body has a mesh-like part, it can be made lighter than conventional bicycle chain cases, which are entirely made of materials such as steel plates.

Furthermore, since the conventional case was entirely made of materials such as steel plates, once the case surface was scratched, it appeared as a clear continuous line, making it extremely noticeable and causing an unsightly appearance. Even if scratches are made on the mesh-like part according to the invention, the scratches cannot be seen as continuous lines due to the presence of the mesh, so they are not very noticeable and have the effect of having almost no effect on the appearance.

Furthermore, in the case of a half-sided case that covers most of the chain and gears, it was inconvenient in the conventional case that it was impossible to wash mud etc. adhering to the chain by spraying water from the outside of the chain case. It is extremely convenient because it can be washed with water from the outside of the case through the mesh-like part. In addition, in the case of a full case that covers all of the chain and gears, it was inconvenient to check the looseness of the chain inside the case from the outside in the conventional case, but with the present invention, the looseness of the chain inside the case cannot be inspected from the outside. The looseness of the inner chain can be easily checked visually from the outside, which is extremely convenient and also excellent in terms of safety.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a bicycle chain case according to the present invention. 1... Chain case, 2... Case body, 3
...Mesh-like board material.

Claims (1)

[Scope of utility model registration request] A bicycle chain case characterized by comprising a case body whose outer shape is formed only by press-forming a mesh-like plate material.