Fluid-pressure and analogous brake systems – Automatic – Synchronizing
Patent
1987-11-05
1989-04-11
Reger, Duane A.
Fluid-pressure and analogous brake systems
Automatic
Synchronizing
303 69, 303 72, B60T 1542, B60T 1532, B60T 1546
Patent
active
048199931
ABSTRACT:
A freight brake control valve device having an improved quick service function provided by suppressing premature cut off operation of the quick service limiting valve. In one embodiment of the invention, this is accomplished by connecting the quick service volume pressure to the underside of the quick service limiting valve piston during preliminary quick service to counteract the pressure pulse on the opposite side of the piston that occurs during the transition between the preliminary and secondary stages of quick service. In a second embodiment, pressure is created at the underside of the quick service limiting valve piston by dashpot action of the piston itself.
REFERENCES:
patent: 1910544 (1933-05-01), Hewitt
patent: 2913282 (1959-11-01), Jeffrey
patent: 3018138 (1962-01-01), Wilson et al.
patent: 3208801 (1965-09-01), McClure et al.
patent: 4002375 (1977-01-01), Weber, Jr.
patent: 4230374 (1980-10-01), King
"AB" Single Capacity Freight Car Air Brake Equipment with the ABD Control Valve; WABCO; 9--1979.
"AB" Single Capacity Freight Car Air Brake Equipment with the ABDW Control Valve; WABCO; 11--1980.
Gaughan Edward W.
Hill Theodore B.
American Standard Inc.
Falce G. J.
Newholm Timothy
Reger Duane A.
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