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. 07, 2012
Filed:
Mar. 08, 2004
Masato Kato, Maebashi, JP;
Yoshinori Mizumura, Maebashi, JP;
Takayuki Yabe, Maebashi, JP;
NSK Ltd., Tokyo, JP;
Abstract
A ball screw devicecapable of increasing a load capacity by increasing the size of ball diameter and the number of threads by preventing the cutout of a nut from being interfered with a thread groove adjacent to the cutout even in the thread groove of a small lead screw and a multiple thread screw, wherein a circulating blockforming, in association with the cutout, a ballcirculation passagefor communicating an area between both thread groovesandwith a ball return passageis fitted to the cutoutformed at the end of the nutso that the large number of ballscan be endlessly circulated between both thread groovesand, ball circulation passage, and ball return passage. The face of the cutoutfacing the axial direction thereof is used as a ball running surface, a ball circulating grooveis formed at the portion of the circulation blockopposed to the ball running surface, and the ball circulation passageis formed of the ball circulating grooveand the ball running surface