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. 05, 2010
Filed:
Nov. 10, 2005
Ryan B. West, Saginaw, MI (US);
Bir Inder Singh, Saginaw, MI (US);
Stephen R. Ahlers, Saginaw, MI (US);
Ryan P. Thomas, Frankenmuth, MI (US);
Gwo-shum Burt Shiu, Saginaw, MI (US);
Ryan B. West, Saginaw, MI (US);
Bir Inder Singh, Saginaw, MI (US);
Stephen R. Ahlers, Saginaw, MI (US);
Ryan P. Thomas, Frankenmuth, MI (US);
Gwo-Shum Burt Shiu, Saginaw, MI (US);
Danaher Motion, Inc., Saginaw, MI (US);
Abstract
A ball screw assembly has an axially extending screw with an external helical groove and a nut with a through bore for receipt of the screw. The through bore has an internal helical groove adapted for cooperation with the external helical groove to define a ball raceway. A plurality of load bearing balls is disposed in the raceway for rolling contact with the internal and external grooves. A spacer is disposed between adjacent ones of the load bearing balls to prevent the balls from contacting one another. Each of the spacers has at least three pairs of diametrically opposite concave dimples adapted for contact with the load bearing balls at separate times from one another.