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. 19, 2005
Filed:
Dec. 18, 2002
Applicants:
Yasumi Watanabe, Gunma, JP;
Hitoshi Sannomiya, Gunma, JP;
Inventors:
Yasumi Watanabe, Gunma, JP;
Hitoshi Sannomiya, Gunma, JP;
Assignee:
NSK Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H001/18 ;
U.S. Cl.
CPC ...
Abstract
A rolled ball screw has a screw shaft having a ball screw groove so as to engaging with rolling elements of a ball screw, the screw shaft is formed by rolling while a thread rolling die is pressed against a cylindrical bar-shaped member to thereby roll the ball screw groove, wherein the number of waves per circumference per lead of said ball screw groove is set different from the integer multiples of the number of said rolling elements per lead of said ball screw groove.