Fluid-pressure and analogous brake systems – Automatic – Synchronizing
Patent
1988-08-17
1989-05-16
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Automatic
Synchronizing
303 33, 303 37, 303 82, 303 69, B60T 1542, B60T 1530
Patent
active
048304387
ABSTRACT:
An improved freight brake emergency valve providing improved stability against undesired emergency brake applications without degradation of emergency sensitiveity by increasing the "breathing" range of travel of the emergency piston to allow a momentary random brake pipe pressure fluctuation to dissipate, and by providing a volumetric chamber between the quick action chamber "breather" port connection at the slide valve/seat interface and the "breather" choke in order to obtain a momentary fast reduction of quick action chamber pressure to counteract a brake pipe pressure fluctuation during pressure equalization between the quick action chamber and the added volumetric chamber.
REFERENCES:
patent: Re31059 (1982-10-01), Hart
patent: 4106819 (1978-08-01), Hart
patent: 4113319 (1978-09-01), Zoric
patent: 4125293 (1978-11-01), Hart
patent: 4690463 (1987-09-01), Hart
patent: 4744609 (1988-05-01), Weber, Jr.
patent: 4770472 (1988-09-01), Weber, Jr. et al.
patent: 4776642 (1988-10-01), Hart et al.
patent: 4783124 (1988-11-01), Gaughan et al.
"AB" Single Capacity Freight Car Air Brake Equipment with The "ABD", Control Valve, Sep. 1979, WABCO, 5062-16.
AB Single Capacity Freight Car Air Brake Equipment with The "ABDW", Control Valve, Nov. 1980, WABCO, 5062-18.
Gaughan Edward W.
Hart James E.
American Standard Inc.
Butler Douglas C.
Falce G. J.
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