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. 23, 1990
Filed:
Feb. 27, 1987
Michel Grenier, Dampart, FR;
Jean-Etienne De La Gorce, Paris, FR;
Daniel Cieplinski, Villemomble, FR;
Gerard Leturgie, Auvers S/oise, FR;
Yvers Thurin, Sucy en Brie, FR;
Laurent Meret, Brunoy, FR;
Christian Doireau, Paris, FR;
Wabco Westinghouse Equipements Ferroviaires, Sevran, FR;
Regie Autonome des Transports Prisiens 'RATP', Paris, FR;
Abstract
Braking unit for vehicle, of the type comprising an axial actuating helical spring maintained in release position, against its elastic reaction force, through a screw-nut system rotatively driven by an electric motor, the spring acting upon the brake through the intermediary of a hydraulic master cylinder of which the piston is axially connected to an abutment ring of the spring also mechanically connected, via a screw-nut system to the rotor of an electric motor, such an unit being applied to a spring braking system for a vehicle possibly with a built-in park brake.