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:
Jun. 02, 1998
Filed:
Oct. 18, 1995
Cheng-kuo Sung, Hsinchu, TW;
National Science Council, Taipei, TW;
Abstract
A multistage sprocket assembly for a bicycle with at least one large sprocket and one small sprocket disposed adjacent to each other and assembled in a relationship such that the distance between the escape point between a pair of adjacent teeth at the large sprocket and the engagement point between a pair of adjacent teeth at the small sprocket is small than an integer multiple of the chain pitch. A recess portion is formed at the side surface of the large sprocket facing the small sprocket to prevent interference between the side link plate of the chain with the side surface of the large sprocket when the chain is being shifted from the large sprocket to the small sprocket. The chain between the aforesaid escape point and engagement point is also supported by the recess portion and forms a nonlinear upshifting path as seen from an axial direction from the small sprocket to the large sprocket.