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. 29, 2008
Filed:
Sep. 10, 2004
Tsutomu Ohkubo, Kanagawa, JP;
Eiji Hayashi, Kanagawa, JP;
Tsutomu Ohkubo, Kanagawa, JP;
Eiji Hayashi, Kanagawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
A ball screw apparatus includes: a screw shaft having a screw groove, a nut having a screw groove and holes, a number of balls rollably provided between the screw grooves, and a ball circulating member having an end portion to be fitted to the holes. The ball circulating member includes aside cap having leg portions to be fitted into the holes. Each of the leg portions contains a scooping up path or a returning path. The scooping up path and the retuning path are inclined with respect to outer peripheral faces of the leg portions. The holes include a slot substantially in parallel with directions of the screw grooves. The scooping up path and the returning path are directed substantially in a tangential direction of the screw shaft and inclined substantially toward a lead angle direction of the screw grooves.