B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/46
B60T 17/00 (2006.01)
Patent
CA 1212142
PNEUMATIC CONTROL FOR BRAKING SYSTEM PROVIDING SNOW BRAKE OPERATION ABSTRACT OF THE DISCLOSURE A railway vehicle braking system is provided with a "snow brake" control arrangement which is used in freezing temperatures to apply a small brake force for prolonged periods to engage blocks or shoes on the vehicle wheels to reduce icing. The "snow brake" control arrangement itself includes an pneumatic valve system that includes a relay valve unit which, in a first mode, provides "snow brake" operation and, in a second mode, provides for application of brake pressure from the straight air pipe to the brake cylinders. A solenoid valve, actuated responsive to energization of a control solenoid by a snow brake control switch, controls connection of "snow brake" pressure from a supply reservoir to a control chamber of the relay valve. When the straight air pipe is pressurized responsive to call for service or emergency braking, the solenoid is de-energized and the con- trol chamber vents to atmosphere through the solenoid valve. The relay valve provides a delay in re-energization of the solenoid, and hence in effecting reinstatement of "snow brake" operation, so that the slack adjusters can make whatever slack adjustment in the brakes that is necessary.
419655
Langley Keith W.
Washbourn Jack
Fetherstonhaugh & Co.
Westinghouse Brake And Signal Company Limited
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