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:
Jan. 09, 2007
Filed:
Mar. 17, 2003
Tsutomu Ohkubo, Gunma, JP;
Tsutomu Ohkubo, Gunma, JP;
NSK Ltd., Tokyo, JP;
Abstract
A linear motion device includes an inner member and an outer member cooperatively forming a ball circulating path therebetween, a plurality of balls rollably disposed in the ball circulating path, and a plurality of retaining pieces interposed between the balls, wherein the ratio of a ball-to-ball direction force applied to the retaining piece by the balls disposed at the both sides thereof to the elastic displacement of the retaining piece by the force is adjusted to a range of from 0.1 to 10 [N/μm] from 0.1 to 10 [N/μm] by predetermining a bore diameter of a through-hole formed at the central portion of the retaining piece to a range of from 35% to 65% of a diameter of the ball.