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:
May. 06, 1980
Filed:
Feb. 02, 1978
Takashi Segawa, Sakai, JP;
Shimano Industrial Company Limited, Osaka, JP;
Abstract
A gear crank for a bicycle, which comprises a crank shaft, a pair of crank arms and a chain gear, is provided with concave and convex portions which are formed at both ends of the crank shaft and extending axially thereof so as to be fitted with concave and convex portions formed at a boss of each of the crank arms respectively, gear-fixing plates each of ring-like shape which have concave and convex portions fitted with the concave and convex portions at the crank shaft and are inserted onto the crank shaft together with the chain gear, and an engagement arranged between the chain gear and gear-fixing plates, so that the chain gear may be fixed to the crank shaft by use of a fixing member for fixing one of the crank arms to the crank shaft.