Fluid-pressure and analogous brake systems – Locks
Patent
1986-11-12
1987-08-11
Caldwell, Sr., John W.
Fluid-pressure and analogous brake systems
Locks
188265, 303 2, 303 13, 303 84A, B60T 1716
Patent
active
046857443
ABSTRACT:
A two-way check valve is utilized with each brake assembly to apply pressure against a single actuating diaphragm. One inlet port is connected to the service air supply and one inlet port is connected to the emergency air supply. Satisfactory pressure of either supply operates the brake connected to the brake assembly in a service manner, the loss of air pressure in either supply causing that supply to be closed by the check valve. Emergency air venting from a spring-biased piston with a pawl end causes the pawl to engage a rack surface of the brake actuator rod. Hence, no spring is used to power the brake actuator rod and brake connected thereto closed when there is a loss service air pressure.
REFERENCES:
patent: Re29913 (1979-02-01), Case et al.
patent: 1213363 (1917-01-01), Henry
patent: 1486939 (1924-03-01), Winter
patent: 2240166 (1941-04-01), Stanley
patent: 3151525 (1964-10-01), Dobrikin et al.
patent: 3497267 (1970-02-01), Dobrikin
patent: 3507542 (1970-04-01), Cannella
patent: 3721474 (1973-03-01), Rogers
"Kent's Mechanical Engineers' Handbook", Design and Production Vol., 20th Ed. (New York: John Wiley & Sons, Inc., 1950), pp. 13-13 to 13-14.
Caldwell Sr. John W.
Oberley Alvin
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