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:
Jul. 04, 2000
Filed:
Feb. 01, 1999
Shigekazu Nagai, Tokyo, JP;
Hiroyuki Shiomi, Ibaraki-ken, JP;
SMC Kabushiki Kaisha, Tokyo, JP;
Abstract
A ball screw of an actuator is inserted through a displacement member. Driving-side axial magnetic patterns and driving-side circumferential magnetic patterns are formed on an outer circumference of the displacement member. The ball screw and the displacement member are surrounded by a tube. A slider is provided at the outside of the tube. Driven-side axial magnetic patterns opposing to the driving-side axial magnetic patterns and driven-side circumferential magnetic patterns opposing to the driving-side circumferential magnetic patterns are formed on the slider. Mutual magnetic attraction between the driving-side patterns and the driven-side patterns prevents the displacement member from rotation, and it causes the slider to make displacement in the axial direction together with the displacement member. Since the ball screw of the actuator is surrounded by the tube, the actuator can be prevented from scattering of lubricating oil, dust or the like.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile