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:
Aug. 07, 2001
Filed:
Jul. 21, 1999
David W. Daugherty, Jr., Plainfield, IL (US);
Westinghouse Air Brake Company, Wilmerding, PA (US);
Abstract
A brake cylinder for use in a railway vehicle braking system is provided. The brake cylinder comprises a cylindrical casing engageable with the railway vehicle braking system, a hollow piston assembly which is mounted for reciprocal movement within the cylindrical casing and having a hollow portion defined by a back wall and at least one sidewall. A small piston assembly is positioned within this hollow portion and includes a first surface facing the back wall of the hollow portion and a peripheral edge portion for sealingly engaging an inner surface of the sidewall of the hollow portion. A first space is defined by the back wall of the hollow portion, at least a portion of the inner surface of the at least one sidewall and the first surface of the small piston. Fluid pressure is supplied within this first space during a brake application of the railway vehicle braking system resulting in movement of the hollow piston assembly away from the small piston assembly and consequently initiating a braking sequence of the railway vehicle braking system. Fluid pressure may also be evacuated from the first space during a brake release of the railway vehicle braking system resulting in movement of the hollow piston assembly toward the small piston assembly.