Fluid-pressure and analogous brake systems – Multiple control
Patent
1980-10-27
1983-01-11
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple control
188198, 303 72, 303 81, 303 86, B60T 1546
Patent
active
043679030
ABSTRACT:
A snow brake control system in which application of the snow brake pressure during release of a normal brake application is withheld for a duration sufficient to assure movement of the vehicle brake apparatus from a brake application position to a release position, to thereby cause automatic slack adjuster action to take place. In one embodiment, operation of a piloted pneumatic valve is delayed by restricting the exhaust of pressure from a volume reservoir via a choke to thereby momentarily withhold the connection of snow brake control pressure to one inlet of a double check valve that is subject at its opposite inlet to normal brake control pressure. The double check valve is effective to connect the predominant one of the pressures at its opposite inlets to a relay valve to produce brake pressure. In a second embodiment, the double check valve is eliminated and the pilot pneumatic valve controls the connection of either snow brake or normal brake control pressure to the relay valve.
REFERENCES:
patent: 2877870 (1959-03-01), Tack et al.
patent: 3180695 (1965-04-01), McClure
patent: 3707208 (1972-12-01), Kyllonen
American Standard Inc.
Butler Douglas C.
Falce G. J.
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