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. 08, 2014
Filed:
Dec. 07, 2010
Tomonari Yamakawa, Hoi-gun, JP;
Tomonari Yamakawa, Hoi-gun, JP;
Jtekt Corporation, Osaka-Shi, JP;
Abstract
In a manufacturing method for a hollow rack shaft, and a hollow rack shaft, a tubular member () having a planar flat portion () that is formed in part of a tubular body portion () is sandwiched and held between a cope () and a drag () that has a tooth-shaped portion () substantially symmetrical with rack teeth () so that a surface () of the flat portion () is in contact with the tooth-shaped portion (). A back die () having a plurality of protrusions () is arranged so that the protrusions () face groove portions () of the tooth-shaped portion () across the flat portion (), and the back die () is pressed against the flat portion () to form the rack teeth () to thereby manufacture the rack shaft.