B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/10
B60T 15/46 (2006.01) B60T 13/66 (2006.01) B60T 17/18 (2006.01) B61H 15/00 (2006.01)
Patent
CA 1167087
(Case No. 7057) ABSTRACT OF THE DISCLOSURE 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 applica- tion position to a release position, to thereby cause automatic slack adjuster action to take place. In one embodiment, opera- tion 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 con- trols the connection of either "snow brake" or normal brake control pressure to the relay valve.
388006
American Standard Inc.
Fetherstonhaugh & Co.
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