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:
Nov. 04, 1997
Filed:
May. 10, 1995
Wei Li, Pittsburgh, PA (US);
Paul J Boget, Murrysville, PA (US);
Union Switch & Signal Inc., Pittsburgh, PA (US);
Abstract
A brake pipe pneumatic valve attachable to an end of a railway vehicle having a first flexible air hose for transmitting brake pipe pressure, and the end-of-train device with a second flexible air hose. The valve includes a housing having first, second, and third ports. The first port is releasably connectable to the first flexible air hose; the second port is releasably connectable with the second flexible air hose; and the third port is releasably matable with a coupling connected to a helper locomotive brake pipe. The valve includes a piston that divides the housing into first and second chambers. The first chamber communicates with the first and third ports; the second chamber communicates with the second port. Also, the piston has a channel therethrough connecting the first and second chambers. The valve further includes first biasing means, disposed between the housing and the piston, for selectably urging the piston towards sealing the first port. Second biasing means, disposed between the housing and the piston, for selectably urging the piston away from sealing the first port and acting to oppose the first biasing means is used, and is an operating pin. The valve includes coupling means attached to the housing releasably matable with a glad-hand coupling. The coupling means includes a mating surface with a protruding locking tongue, an aperture in communication with the third port, and a locking lip that is arranged with respect to the mating surface to form a locking channel.