JP3010058U - Bicycle chain case - Google Patents

Abstract

(57) [Summary] [Purpose] Preventing the deformation of the chain case with the chain stay easily inserted. [Structure] An insertion hole 3 for inserting a chain stay is formed in a rear portion of a case body 1 by extending in a front-rear direction along a longitudinal direction of the stay, and an outer surface of the chain stay is provided at a front portion of the insertion hole 3. A reinforcing rib 4 also serving as a blindfold is formed integrally with the case main body 1 so as to cover the case main body 1, and is connected to the insertion hole 3 to form a downwardly expanding notch 5 in the rear part of the case main body 1. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention relates to a bicycle chain case, and is particularly used for small bicycles for infants.

[0002]

[Prior art]

 As a half-faced chain case that covers the outer surfaces of the chain and the gear, there is a bicycle chain case disclosed in Japanese Utility Model Publication No. 63-85050. In this chain case, an insertion hole for inserting a chain stay is formed in the rear part of the case body by extending in the front-rear direction along the longitudinal direction of the station, and a notch communicating with the insertion hole is formed in the rear part of the case body. It was established.

[0003]

[Problems to be solved by the device]

 In the chain case disclosed in the above publication, since the insertion hole is formed long in the front-rear direction, it is easy to insert the chain stay, but most of the stay is so-called exposed and mud adheres. In addition to the increase in the number of cases, a vertical cut is likely to occur due to the notch formed in the rear part of the case body, and there was a slight problem in terms of durability.

Further, when the stand is attached to the rear portion of the case body, it is difficult to select the attachment position of the stand attachment plate in the open cutout portion in the front and rear direction to attach the stand. Therefore, the present invention suppresses deformation of the case body and prevents mud from adhering to the stay as much as possible even when the chain stay insertion hole is formed in the case body in the front-rear direction, and also selects a stand mounting portion. The purpose is to provide an easier bicycle chain case.

[0005]

[Means for Solving the Problems]

 The present invention provides the following technical means for achieving the above-mentioned object in a bicycle case case of a half-face case that covers the outer surfaces of the chain and gears. That is, in the present invention, an insertion hole 3 for inserting a chain stay is formed in the rear portion of the case body 1 so as to extend in the front-rear direction along the longitudinal direction of the stay, and the chain stay is provided at a front portion of the insertion hole 3. Reinforcing ribs 4 that also function as blindfolds are formed integrally with the case body 1 so as to cover the outer surface of the case body, and communicate with the insertion holes 3 to form a downwardly expanding notch 5 at the rear of the case body 1. It is characterized by being provided.

In the present invention, it is preferable that the reinforcing rib 4 is formed in a spindle shape in a side view of the bicycle, and has an inclined surface 4A from the rear to the front in a plan sectional view. Further, in the present invention, it is preferable that the notch 5 has a widening area in which the stand mounting plate 7 can be positioned forward or backward to be selectively mounted.

Further, in the present invention, it is preferable that the case body 1 and the reinforcing rib 4 are integrally formed of hard resin.

[0008]

[Action]

 The insertion hole 2 of the chain stay 2 has a reinforcing rib 4 formed integrally with the case body 1 at the front portion thereof so that the chain stay 2 can be inserted without hindrance and deformation of the case body 1 is suppressed. Decrease mud adhesion to stay 2. Further, the stand mounting plate 7 can be mounted even if the front or rear is selected in the notch portion 5 provided in the rear portion of the case body 1.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 4, the chain case is composed of a half-face case body 1 that covers the outer surfaces of the chain and gears. The case body 1 covers a front portion 1A that covers a crank gear portion and a rear wheel gear portion. The rear portion 1B and the rear portion 1B are connected to each other to form a substantially oblong oval shape, and a peripheral edge 1D thereof is bent inward.

In the present embodiment, the rear portion 1B and the body portion 1C are integrally formed, but the front portion 1A is joined and integrated to the body portion 1C by the spigot portion 1E, but the whole is integrally formed of hard resin. It may be one. A crankshaft insertion hole 1F is formed in the front portion 1A, but the hole edge is formed by a bulged annular rib 1G to prevent deformation.

At the rear part of the case body 1, an insertion hole 3 of the chain stay 2 is extended in the front-rear direction along the longitudinal direction of the stay 2, and the chain stay 2 is provided at the front part of the insertion hole 3 on the outer side surface. The reinforcing ribs 4 are formed so as to bulge integrally with the body portion 1C so as to cover from the inside. The reinforcing ribs 4 are formed in a spindle shape in a side view of the bicycle (see FIG. 1), and are formed on the inclined surface 4A from the rear to the front downward in a plan sectional view (see FIG. 3) of the chain stay 2. Part of the cover is blinded, and the opening of the insertion hole 3 is prevented to prevent deformation of the case body 1.

The reinforcing rib 4 formed in the front portion of the insertion hole 3 is swelled in a saddle shape as shown in FIG. 5 to prevent the case body 1 from being deformed together with the bent edge 1D. A downwardly expanding cutout portion 5 is formed in the rear portion of the case body 1 so as to communicate with the insertion hole 3, and the cutout portion 5 has a vertical portion 5A when the stand 6 is attached to the front as shown in FIG. The stand mounting plate 7 is positioned by means of, and when the stand 6 is mounted rearward as shown in FIG. 7, there is an expansion area where the stand mounting plate 7 can be positioned by the horizontal portion 5B. 7 can be positioned selectively in the front or rear.

It should be noted that it is desirable to form ribs 8 on the back surface of the body portion 1C of the case body 1 at predetermined intervals in the front-rear direction at the boundary portion with the peripheral edge 1D as shown in FIGS. 4 and 6. The rib 8 can be omitted. In addition, in the figure, 9 is a stopper, which is attached to the upper and lower sides of the insertion hole 2 with bolts or the like using the attachment holes 9A. Reference numeral 10 indicates a rear frame of the bicycle.

[0014]

[Effect of device]

 According to the present invention, since the reinforcing rib is bulged at the front portion of the insertion hole of the chain stay, the opening of the insertion hole is prevented from opening and the vertical deformation is surely prevented, and the durability of the case body is improved. And the adhesion of mud to the chain stays can be reduced.

Further, the cutout portion at the rear portion of the case main body is formed in a downwardly widened shape, so that the stand mounting plate can be mounted in a state in which the front or rear is selected and positioned.

[Brief description of drawings]

FIG. 1 is an overall front view of a chain case showing an embodiment of the present invention.

FIG. 2 is a bottom view of the same.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an overall back (back) side view of the chain case.

5 is a sectional view taken along line BB in FIG.

6 is a cross-sectional view taken along line CC of FIG.

FIG. 7 is a partial explanatory view of a state where the stand rear portion is mounted.

[Explanation of symbols]

 1 Case body 2 Chain stay 3 Chain stay insertion hole 4 Reinforcing rib 5 Notch

Claims (4)

[Scope of utility model registration request] 1. A bicycle case case of a half-face case type for covering the outer surfaces of a chain and a gear, wherein an insert hole (3) for inserting a chain stay is provided in a rear portion of a case body (1) along a longitudinal direction of the stay. A reinforcing rib (4), which is formed by extending in the front-rear direction and bulges so as to cover the chain stay from the outer side, is integrated with the case body (1) at the front part of the insertion hole (3). A bicycle chain case, characterized in that a notch (5) is formed on the rear side of the case body (1) and communicates with the insertion hole (3). 2. The reinforcing rib (4) is formed in a spindle shape in a side view of the bicycle, and has an inclined surface (4A) that is downward from the rear part in a plan sectional view thereof. The bicycle chain case described in 1. 3. The bicycle according to claim 1, wherein the notch (5) has a widening area where the stand mounting plate (7) is positioned forward or rearward and can be selectively mounted. Chain case. 4. The bicycle chain case according to claim 1, wherein the case body (1) and the reinforcing rib (4) are integrally formed of hard resin.