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. 15, 2000
Filed:
Jun. 21, 1994
Toshikazu Yabe, Saitama, JP;
Ken Namimatsu, Gunma, JP;
NSK Ltd., Tokyo, JP;
Abstract
A ball screw comprising a screw shaft, a ball screw nut, a plurality of balls contained in the ball screw nut which is in threadable engagement with the shaft so that it is capable of relative movement in the linear axial direction as guided by the rolling of the balls, and a lubricant-containing polymer member that is installed in the ball screw nut in contact with the balls or in slidable contact with screw grooves in the screw shaft. The lubricant seeps out of the polymer member slowly and is supplied not only to the balls but also to the screw grooves, so that it maintains the desired lubricating effect in a consistent and automatic way over an extended period of time.