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:
Apr. 23, 2002
Filed:
Aug. 04, 2000
Applicant:
Inventors:
Hideki Hashitani, Saitama, JP;
Masami Tanaka, Saitama, JP;
Assignee:
NSK, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23P 1/304 ;
U.S. Cl.
CPC ...
B23P 1/304 ;
Abstract
After heat treatment for hardening the outer peripheral surface of the input shaft is enforced, a straightening operation for straightening the bent portions of the input shaft caused by the heat treatment is carried out prior to formation of the through holes After then, the input shaft is machined using electric sparks to thereby form the through holes in the input shaft In the present working method, there is eliminated the possibility that, during the straightening operation, stresses can concentrate in the through holes portions of the input shaft thereby being able to attain the above object.