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:
Nov. 08, 1994
Filed:
Aug. 24, 1993
Chan-Hua Feng, Hsinchu, TW;
Jiann-Chyun Kang, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A shift lever apparatus for use in bicycles comprising first and second ratchet wheels and first and second switch levers, all of them being mounted on a main shaft. The first and second switch levers contain first and second ratchet pawls for engaging with the first and second ratchet wheels, respectively. The first and second ratchet wheels are connected to a cam via a gear set so as to cause the cam to rotate in forward and reverse directions, respectively. The outer periphery of the cam consists a plurality of spiral sectors, each of which having monotonically increasing radius, alternated with a plurality of circular sectors, each of which having constant radius. When a follower, which is provided in the shift lever apparatus, is in contact with one of the spiral sectors, a movement of the first or the second lever will cause the cam to rotate, in a forward or reverse direction, and the follower to pull or release the shifting cable according, thus allowing the derailleur to shift gear upward or downward.