Expansible chamber devices – Relatively movable working members – First working member moves second coaxial working member...
Patent
1980-06-09
1982-12-21
Hershkovitz, Abraham
Expansible chamber devices
Relatively movable working members
First working member moves second coaxial working member...
92 29, F01B 700
Patent
active
043643051
ABSTRACT:
A brake cylinder device combining a pneumatically-applied service brake and a spring-applied parking brake in a compact unit made possible by limiting the stroke of the parking brake piston to minimize the expansion of the spring and thus the amount of force relaxation, so that a relatively small spring may be used. The service brake piston carries a threaded shaft on which a nut is rotatably carried for locking engagement with the parking brake piston. The position of this nut during service braking is maintained in a predetermined position in proximity with the parking brake piston, by reason of a back-up spring imparting rotation, as the service piston takes up slack in the brake rigging, so that when the parking brake is subsequently applied, by locking engagement with the nut following only a short stroke, the stored energy of the spring acting through the parking brake piston, the nut and screw end of the service piston, and the service piston itself, substantially full force of the constrained parking brake spring is effective.
REFERENCES:
patent: 3704653 (1972-12-01), Higgins
patent: 3717072 (1973-02-01), Kaltenthaler
patent: 3994205 (1976-11-01), Ekdahl
patent: 4018140 (1977-04-01), Engle
patent: 4036111 (1977-07-01), Dahlkvist
patent: 4080876 (1978-03-01), Sturgess
Dalibout Georges
Grenier Michel
Falce G. J.
Hershkovitz Abraham
WABCO Westinghouse, S.A.
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