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:
Jun. 13, 1978
Filed:
Jul. 28, 1977
Glen O Bohusch, Watertown, NY (US);
Walter E Rojecki, Watertown, NY (US);
General Signal Corporation, Rochester, NY (US);
Abstract
An electro-pneumatic pilot valve device is operably connected to a relay valve device for governing fluid pressure control of friction brakes of a vehicle in accordance with at least one variable analog signal input to the pilot valve device. The electro-pneumatic pilot valve device has a differential piston assembly comprising a valve plunger having ball valves disposed coaxially thereon and input, vent, and pilot chambers associated with the valves wherein one of the valves selectively connects the input chamber to the pilot chamber, and another valve selectively connects the pilot chamber to the vent chamber. A linear torque motor is governed by a variable input electrical signal for selectively applying a force axially to the plunger to vent fluid from the pilot chamber to atmosphere through the vent chamber. A balance of forces acting on the plunger permits operation of the valves to a lap position.