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:
Oct. 26, 1999
Filed:
Dec. 23, 1996
Thomas H Engle, Clayton, NY (US);
Westinghouse Air Brake Company, Wilmerding, PA (US);
Abstract
Electropneumatic brake control valve for control of brakes on a railway vehicle. It has a supply valve and release valve moved by a common displaceable actuator. The supply valve connects an air supply passage to a delivery passage and the release valve connects the delivery passage to an exhaust. The delivery passage is for supplying air to a brake shoe application device. The invention has a feedback space having pressure connection to the delivery passage. A portion of the common displaceable actuator is located within the feedback space, as is a positioner for the common displaceable actuator. The positioner has at least three force and displacement communication portions. The first communicates a first force and a first displacement with the common displaceable actuator. The invention has a pressure defining member which defines pressure by its position. It communicates a second force and a second displacement with the second one of the force and displacement communication portions. The invention has a pressure regulator which has a regulating member communicating a third force and a third displacement with the third one of the force and displacement communication portions. The regulator moves in accordance with a comparison between the air pressure in the feedback space and a force exerting device. The force exerted by the force exerting device is dependent on the third displacement. The invention also has apparatus for positioning the pressure defining member, this apparatus controlled by electrical signals from a brake control system of the railway vehicle.