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:
Feb. 10, 2015
Filed:
Mar. 31, 2011
Atsushi Watanabe, Fujisawa, JP;
Toru Harada, Fujisawa, JP;
Shouji Yokoyama, Hanyu, JP;
Kiyoshi Ootsuka, Fujisawa, JP;
Koji Hashimoto, Fujisawa, JP;
Kazuto Kobayashi, Fujisawa, JP;
Toshio Nakamura, Fujisawa, JP;
Shinobu Mogi, Fujisawa, JP;
Shingo Saitou, Fujisawa, JP;
Tomofumi Yamashita, Fujisawa, JP;
Atsushi Watanabe, Fujisawa, JP;
Toru Harada, Fujisawa, JP;
Shouji Yokoyama, Hanyu, JP;
Kiyoshi Ootsuka, Fujisawa, JP;
Koji Hashimoto, Fujisawa, JP;
Kazuto Kobayashi, Fujisawa, JP;
Toshio Nakamura, Fujisawa, JP;
Shinobu Mogi, Fujisawa, JP;
Shingo Saitou, Fujisawa, JP;
Tomofumi Yamashita, Fujisawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
A method forms a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die. Letter S shaped concaves are formed on an inner circumferential surface of a nut blank, by pressing by use of a die having a blank holder, a cam driver, cam sliders, and a cylindrical member. The cam driver has inclined surfaces having the same angle of inclination as the cam sliders. The cam sliders have letter S shaped convexes corresponding to the letter S shaped concaves, and are held by through holes, respectively. When the cam driver is pressed from the top thereof, the cam sliders move outwardly in the radial direction, respectively, and the letter S shaped convexes push the inner circumferential surface of the nut blank for plastic deformation.