Machine element or mechanism – Control lever and linkage systems – Hand operated
Patent
1977-11-09
1981-08-11
Dorner, Kenneth
Machine element or mechanism
Control lever and linkage systems
Hand operated
192 12BA, G05G 108, F16D 6702
Patent
active
042827710
ABSTRACT:
A railroad hand brake includes a spring clutch interposed between an operating hand wheel and a gear drive for the chain drum. The clutch includes a spring cooperating with a control drum and with an output drum connected to the gear drive. An input element is rotated by the hand wheel in a forward direction to energize the spring so that the input element, the control drum and the output drum rotate as a unit to take up the brake load. A ratchet and pawl prevent reverse movement of the control drum in order to maintain the brake load applied when the hand wheel is released. When the hand wheel is rotated in the reverse direction, the input element tends to deenergize the spring, and the brake load is gradually released with a clutch action characterized by small input force and little wear. A quick release element operable with a small manual force abruptly uncouples the spring from the load drum in order to free the load quickly while the input element and hand wheel are stationary.
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Dorner Kenneth
MacLean-Fogg Company
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