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:
Dec. 25, 1984
Filed:
May. 21, 1982
Hirofumi Matsumoto, Kasai, JP;
Masakatu Fujiwara, Kasai, JP;
Yasuyuki Tsuchida, Kanzaki, JP;
Yoshifumi Miyazaki, Taka, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
An electrically operated transmission gear system for a bicycle includes a plurality of transmission gears selectively drivable by an endless chain trained around a pedal-driven crank gear, a reversible motor, a takeup reel drivable thereby, and a wire connected at one end to the takeup reel and at the other end to a chain guide for shifting the endless chain into driving mesh with one of the transmission gears at a time. The transmission gear system also includes means for measuring the speed of travel of the bicycle and/or the speed of rotation of the crank gear, means for detecting a transmission ear with which the endless chain is in driving mesh, and an arithmetic unit for deriving a proper speed range from one of the measuring and detecting means and for comparing an output from the other means with the proper speed range as derived to determine whether the transmission gear held in mesh wish the endless chain is proper or not, whereby gear-shifting for the bicycle can properly controlled.