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:
Sep. 17, 1985
Filed:
Aug. 08, 1983
Kikuzo Takamiya, Kitamoto, JP;
Hiroshi Todoroki, Ageo, JP;
Bridgestone Cycle Co., Ltd., Tokyo, JP;
Abstract
A bicycle frame comprises a main frame having a head tube portion and a seat tube support portion integrally formed of a single blank tube, a seat tube inserted in the seat tube support portion of the main frame and having a cross-shaped lower end formed from a single blank tube by bulge-forming, a metal fitting having an aperture adapted to receive a lower end of the seat tube and chain stay supports on both sides of the aperture, two chain stays having front ends fixed to a mid portion of the main frame and mid portions abutting against the chain stay supports of the metal fitting, and rear forks connecting rear ends of the chain stays and an upper end of the seat tube. Two lateral expanded portions of the cross-shaped lower end are pierced to form apertures into which commercially available bearings are press-fitted to form a hanger portion or bottom bracket of the seat tube. Production processes are simplified to improve the productivity of bicycles. Increased strength of the frame makes it possible to use thinner tubes for the frame to reduce the entire frame weight and hence cost.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile