B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
346/68
B60T 13/66 (2006.01) B60T 7/10 (2006.01) B60T 7/12 (2006.01) B60T 15/04 (2006.01) B60T 15/14 (2006.01) B60T 17/22 (2006.01)
Patent
CA 1325264
ABSTRACT OF THE INVENTION A brake assurance circuit via which a magnet valve device is deenergized to exhaust brake pipe pressure independently of the locomotive brake valve device and thereby apply braking any time the proper operating status of the locomotive brake valve is changed after the locomotive is underway. A pressure switch responsive to the cut-in and cut-out setting of the manual selector valve associated with the brake valve senses the locomotive status and connects one of two possible circuits to the magnet valve device in parallel with a primary circuit having a speed responsive switch. Once locomotive movement is underway, the primary circuit drops out and the effective circuit selected by the pressure switch maintains the magnet valve energized provided the selected pressure switch setting is not changed. Should the pressure switch setting be changed, all power is cut off from the magnet valve and cannot be reapplied until the locomotive comes to a complete halt to allow the speed responsive switch to reset and restore power via the primary circuit.
592881
Fetherstonhaugh & Co.
Westinghouse Air Brake Company
LandOfFree
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