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. 03, 2004
Filed:
May. 29, 2002
Terence John Capewell, Wheaton Aston, GB;
Olivier Pansanel, Herblay, FR;
Lucas Industries Limited, , GB;
Abstract
A screw actuator comprises a rotatable input member and a non-rotatable primary output member, wherein the input member is provided with a screw thread formation within which a plurality of spherical members are received to provide a ball screw coupling between the input member and the primary output member. The actuator includes a secondary output arrangement having first and second screw threaded parts in screw treaded engagement with the input member to provide a screw thread coupling between the input member and the secondary output arrangement. The first and second screw threaded parts are axially movable relative to one another, whereby, in the event that the ball screw coupling fails, relative axial movement of the first and second screw threaded parts serves to lock the first and second screw threaded parts onto the input member, thereby to stall the actuator.