Closing link chain

Abstract

The present invention relates to a closing lock link for a bicycle chain with narrow and long structure, the lock link is composed of two closing lock members that respectively has an external plate and a chain pin fixed on the external plate. The external plate is disposed with a long hole and a pin hole which has a larger diameter in external profile area. The chain pin has a pin head, a pin groove and a pin tail having a cavity extends along axial direction. The cavity is enlarged when mounting the closing lock member thereby the pin tail can tightly contact the pin hole profile to further form a shape coupling connection. In order to obtain minimum chain width, the pin head is short that the thickness of the plate. The pin head is in a concave part at the small diameter end of the long hole. In order to prevent disassembling the locked closing lock chain, the concave part is disposed with one or more narrow parts. The narrow part can effectively engage to the circumferential surface of the pin head or the circumferential surface of the pin groove, or act on the annular surface of the pin groove, or engage to their combination, therefore, the closing lock chain can be prevented from being opened suddenly.

Description

technical field [0001] The invention relates to a locking chain link for a bicycle transmission chain. According to the preamble of the independent claim, the locking chain link consists of two outer straps each equipped with a fixed chain pin, said outer The straps hang onto each other without tools during chain assembly. Background technique [0002] The transmission chain used for a bicycle with a hub shift function or a chain shift function is composed of relatively rotatable chain links, and a complete traction chain is formed by means of the chain links to transmit power. The chain links have internal gaps between the inner straps and the outer straps, into which the teeth of the sprockets can respectively engage. When designing the chain links, different functions must be considered, especially the gear shifting function. If the chain is to be disassembled, eg for repairs, it must be opened. This is achieved by specially designed locking links to be opened. [000...

AI Technical Summary

Problems solved by technology

[0004] This type of locking link is very easy to install, however, since the pin heads extend beyond the outer contour of the outer straps, this type of locking link is not suitable for practical chain shifting parts with many pinions, especially for small Gear installation pitch

In addition, the large groove width on the pin head leads to undesired chain lateral shifting in the area of ​​the locked chain links, which is detrimental to the shifting performance of the chain

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