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:
May. 15, 1979
Filed:
Sep. 12, 1977
Peter Wolf, Baroda, MI (US);
Lambert Brake Corporation, St. Joseph, MI (US);
Abstract
A closed-center brake system and brake valve are disclosed. A closed-center variable displacement pressure compensated pump delivers fluid pressure to a valve inlet which carries a normally closed check valve. When a valve operating rod is partially withdrawn from the valve, the check valve opens to admit fluid to a valve chamber; fluid pressure and flow are directed from the chamber to ports leading to a vehicle left-hand brake and a vehicle right-hand brake. Should fluid pressure be lost in upstream portions of the system, further pulling action on the valve rod will collapse the chamber and manually deliver pressurized fluid to the brakes. Another brake valve outlet port, located just downstream of the inlet check valve, provides for delivery of pressure compensated fluid back to the pump to cause the pump to operate with desired characteristics. Yet another brake valve outlet port delivers fluid to another system element, such as a hydraulically operated vehicle differential, so as to lock left-hand and right-hand vehicle drive trains together to prevent relative rotation when either the left-hand brake, the right-hand brake, or both brakes are operated.