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. 06, 2004
Filed:
Aug. 07, 2002
Ryuichi Kaneko, Tokyo, JP;
Kayaba Industry Co., Ltd., Tokyo, JP;
Abstract
A method of manufacturing a cylinder, includes a step of inserting a cored bar into piping material having a reduced inner radius at one end and supporting the end of the cored bar with the reduced radius section of the piping material . The method also includes rotating the piping material and the cored bar , displacing the piping material in an axial direction while passively rotating at least one roller compressing the outer periphery of the piping material and applying a spinning operation to the piping material while pressuring and retaining the piping material between the cored bar and the roller . Thus the thickness of the middle section of the piping material is made less than the thickness of the end sections by moving the roller into a position closer to the cored bar in the middle section than in the end sections of the piping material. In this manner, processing of the cylinder can be effectively performed without wastage of the material thereof.