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:
Nov. 27, 1984
Filed:
Nov. 02, 1982
Bridgestone Cycle Co., Ltd., Tokyo, JP;
Abstract
A blank tube constituting a main frame for a two-wheeled vehicle, comprises a main tubular portion having thicker walls in the proximity of its ends subjected to the largest forces and tubular expanded portions extending from the ends of the tube for receiving a head tube and a seat tube without using separate parts such as lugs. The blank tube further comprises a gradually enlarged diameter portion adjacent to the tubular expanded portions to more improve the strength of the tube. The thicker walls, tubular expanded portions and gradually enlarged diameter portion are formed simultaneously in dies by bulging. Moreover, the dies are formed with recesses, so that the blank tube is formed with protrusions. The protrusions are formed with apertures for passing brake wires or electric wires through the tube. The main tubular portion of the blank tube is formed in a particular cross-section effectively increasing its strength by pressing by means of the dies including corresponding sectional cavities.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile