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:
Jan. 29, 1991
Filed:
Mar. 05, 1990
Yoshihisa Iwasaki, Sakai, JP;
Jun Kobayashi, Sakai, JP;
Maeda Industries, Ltd., Osaka, JP;
Abstract
The present invention provides a bicycle multiple chainwheel to be mounted on a pedalling crank assembly. The chainwheel, which is held in driving engagement with a chain, comprises a larger sprocket and at least one smaller sprocket coaxial with the larger sprocket. When shifting the chain from the larger sprocket to the smaller sprocket, the chain normally starts disengaging from the larger sprocket at one of specific circumferential positions thereof. In view of this, the larger sprocket is made to have local chain guide portions only at those positions necessary for preventing the thus disengaged chain from being trapped in an axial gap between the larger and smaller sprockets.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile