Patent ID: 6139456
Filing Date: 2000-10-31
Classification: B62M

Abstract:
A bicycle sprocket comprising a plurality of annularly equidistant teeth formed on an outer periphery thereof, the sprocket including two diametrically opposed easy-to-engage teeth, the sprocket further including two diametrically opposed guiding surfaces formed on an outer side thereof, each said guiding surface extending over at least a two tooth span and including an end portion merging with an adjacent one of said easy-to-engage teeth, each said easy-to-engage tooth including a right side with a concave surface and a convex left side when viewed from an outer facing side of the sprocket and forming a sharp end between the right side and the left side, one pair of diametrically opposed teeth respectively spanned by said guiding surfaces and most adjacent to a corresponding one of said easy-to-engage teeth each having a height lower than that of the remaining teeth on the sprocket and having a second concave surface on a right side thereof adapted to engage with one of a number of roller pins of a chain to be engaged with the sprocket.