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. 14, 1986
Filed:
Jun. 22, 1984
Dario Barberis, Turin, IT;
WABCO Westinghouse Compagnia Freni S.p.A., Turin, IT;
Abstract
Parking brake control apparatus on a vehicle equipped with electrofluidic responsive brakes is disclosed. The apparatus comprises a parking brake on the vehicle operable by a cylinder. A source of pressurized fluid provides fluid pressure to the cylinder. The cylinder responds to fluid pressure to release the parking brake and responds to apply the parking brake when fluid pressure is vented. A directional valve connected intermediate the source of fluid pressure and the cylinder controls fluid communication to the cylinder in one position and vents fluid pressure from the cylinder in a second position. Movement to the second position is controlled on one side of the valve by an electrovalve which responds to electrical signals and on the other side by a cylinder which responds to fluid pressure and can only occur when both an electrical signal is below a predetermined minimum and the fluid pressure is reduced.