Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1995-05-10
1997-11-04
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
303 47, 303 86, 285 65, 2511495, B60T 1126
Patent
active
056831480
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.
REFERENCES:
patent: 1665913 (1928-04-01), Durst
patent: 4319787 (1982-03-01), Wickham
patent: 4763875 (1988-08-01), Chew
patent: 5180213 (1993-01-01), Kingsbury
patent: 5211698 (1993-05-01), Winfrey
Boget Paul J.
Li Wei
Graham Matthew C.
Union Switch & Signal Inc.
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