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:
Nov. 19, 2002
Filed:
Feb. 27, 2001
Kentarow Nishimura, Tokyo, JP;
Shino Kimura, Tokyo, JP;
THK Co., Ltd., Tokyo, JP;
Abstract
In a roller screw, a plurality of rollers interposed between a nut member and a screw shaft are composed of a forward-motion load roller group , the rollers of which are arranged in such a manner that the center lines thereof are set at a given angle &agr; with respect to the center line of the screw shaft , and backward-motion load roller group , the rollers of which are arranged in such a manner that the center lines thereof are set at an angle &bgr;, which is different from the angle &agr;, with respect to the center line of the screw shaft ; and, the forward-motion load roller group and backward-motion load roller group are disposed such that they are separated from each other.