Patent ID: 7059983
Filing Date: 2006-06-13
Classification: B62M,F16H

Abstract:
1. A bicycle chain guide device, comprising: a bracket for attachment to a bicycle frame, and a pulley rotably mounted to said bracket, said pulley comprising a roller section and a flange section spaced apart from said bracket by said roller section, wherein said roller section has an inner diameter adjacent said bracket, an outer diameter adjacent said flange and a width adapted to accommodate shifting a chain between at least two front sprockets for the bicycle frame by movement of said chain across said roller section, said bracket being configured to position said pulley in a substantially fixed position and allow for said shifting when attached to the bicycle frame, and wherein said flange section has a diameter adapted to prevent outward movement of said chain from an outer one of the at least two sprockets, and wherein said inner diameter is larger than said outer diameter in order to assist in maintaining said chain on a selected one of said at least two front sprockets.