Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1981-11-16
1983-10-04
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
303 9, 303 13, 303 68, 303 71, 137522, 251 614, B60T 1322
Patent
active
044075480
ABSTRACT:
An air brake system augments the braking force available while parking without interfering with the operation of the parking brakes. The brake system includes a service brake, a pilot check valve and, typically, a quick release valve. The quick release valve and pilot check valve are interconnected in two alternative ways among the service and spring brake lines and the service brake cylinder. When the spring brake line is pressurized the system acts normally. However, when the pressure on the spring brake line is eliminated the pilot check and quick release valves trap the pressurized air within the service brake. This keeps the service brake for each individual wheel actuated. Pressurizing the service brake line pressurizes the service brake regardless of the condition of the spring brake line. Safety valves can be incorporated in the brake systems to insure that the pressure within the service brake chamber does not exceed a predetermined value.
REFERENCES:
patent: 3285672 (1966-11-01), Avrea
patent: 3294455 (1966-12-01), Valentine
patent: 3443839 (1969-05-01), Hinrichs et al.
patent: 3713702 (1973-01-01), Campanini
patent: 4003605 (1977-01-01), Fannin
patent: 4057297 (1977-11-01), Beck et al.
patent: 4223953 (1980-09-01), Cruse
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