Importance

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Abstract

A right outer link plate of a bicycle chain, when viewed from the rear and top, has a projection swelling outwardly on a center edge thereof to lead a tooth of a sprocket into an outwardly spread recess formed by the projection. A left outer link plate of the bicycle chain, when viewed from the rear end top, has a flat face outside and an outwardly tapered face along a central inside portion to lead a tooth of the sprocket into a recess formed by the tapered face. In a front multi - stage sprocket, unit the projection of the right outer plate catches onto a tooth of the large sprocket and the tooth slips into the outwardly spread recess formed by the projection, assuring that the chain shifts from the small sprocket to the large sprocket easily. Although the center edge on the right outer link plate swells outwardly, the front multi - stage sprocket unit has a comparatively wide space between sprockets, and the projection does not interfere with the large sprocket and disturb speed changes. On the other hand, in the rear multi - stage sprocket unit, the tapered face catches onto the tooth of the large sprocket and the tooth slips into the recess formed by the tapered face, which enables the chain to shift from the small sprocket to the large sprocket. Despite that the rear multi - stage sprocket unit has a comparatively narrow space between sprockets, the left outer link plate is flat outside, and the outer link plate does not interfere with the large sprocket.

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First Claim