Patent ID: 7850564
Filing Date: 2010-12-14
Classification: B62M

Abstract:
1. A bicycle sprocket comprising: a sprocket ring part including an inner periphery and an outer periphery with a plurality of sprocket teeth arranged on the outer periphery, the sprocket ring part extending around a central rotation axis with the sprocket ring part being made of metallic material; a plurality of metallic tubular members circumferentially spaced apart from one another about the central rotation axis and positioned radially inward from the inner periphery of the sprocket ring part; and a synthetic resin fastening part non-movably coupled to the sprocket ring part at a location radially inwardly of the sprocket teeth relative to the rotation axis and formed around a portion of each of the plurality of metallic tubular members such that each of the plurality of metallic tubular members is rigidly and non-removably fixed to the synthetic resin fastening part, the synthetic resin fastening part including a plurality of through holes, each of the plurality of through holes being co-axially aligned with a corresponding one of the plurality of metallic tubular members, the through holes configured to be fixedly coupled to a rotational drive unit of a bicycle, the metallic tubular members each having a first fastener contact surface configured and arranged to receive a fastening force, the sprocket ring part including a first anchor structure and the synthetic resin fastening part including a second anchor structure that is directly engaged to the first anchor structure to prevent relative movement of the first anchor structure of the sprocket ring part in a radial outward direction with respect to the second anchor structure of the synthetic resin fastening part, the sprocket ring part and the synthetic resin fastening part being two separate members.