The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 06, 1998
Filed:
Mar. 27, 1997
Yann-Jy Yang, Hsinchu, TW;
Kwang-Shyan Ho, Hsinchu, TW;
Pai-Hsiang Hsu, Tainan, TW;
Ching-Huan Tseng, Chutung, TW;
Ying-Shou Chen, Kaoshiung, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A bicycle front derailleur with a cam level for smoother gear switching is disclosed. The bicycle derailleur is operated by pulling a wire which shifts a chain between at least a large sprocket, a medium sprocket and a small sprocket. The bicycle front derailleur contains a cam lever which is pivotably connected to a four-linkage chain guide moving system at a pivoting point for pulling the chain guide moving system, and thus shifting the chain, when a cable is pulled in a pulling direction. The cam lever has a cam groove formed on the peripheral surface of the cam lever for receiving the wire. The cam lever is structured such that the radial distance between the cam groove and the pivoting point increases in a direction opposite of the pulling direction, so as to provide a greater effective length vertical to the pulling direction when the wire is subject to a greater linear displacement resulting in a greater counterforce. Such an increased effective length provides a greater torque at the same pulling force.