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:
Jul. 15, 2003
Filed:
May. 25, 2000
Masaharu Tsuboi, Saitama, JP;
Seishi Miura, Saitama, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A motor-assisted bicycle and a power unit therefor in which the power unit is after-mounted on an existing bicycle frame without largely changing the design of the bicycle frame so that an assist power generated from the power unit is input into a chain drive. A power unit is formed with at least three boss forming spaces for forming bosses to be fixed to a bicycle frame. The power unit is fixed to the bicycle frame by selectively using any two of the bosses. The bicycle frame has a support pipe and a down pipe to which flanges are fixed, respectively. The two bosses of the power unit are bolted to the flanges, respectively, thereby fixing the power unit to the bicycle frame. In addition, a motor-assisted bicycle is provided having a chain cover for functionally covering a drive sprocket of a power unit together with a pedal sprocket and a chain without marring the appearance. An integral chain cover is composed of a drive sprocket cover portion for mainly covering a drive sprocket, a chain cover portion for mainly covering a stretched portion of a chain, and a pedal sprocket cover portion for mainly covering an upper half of a pedal sprocket. The drive sprocket cover portion for covering the drive sprocket is formed as a circular portion subjected to coloring and surface roughening so as to correspond to the outside shape of the drive sprocket, and this circular portion is positively utilized as a kind of ornament.