Parking brake control system

Details Parking brake control system Parking brake control system

1985-06-26

1987-02-24

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple control

Double heading

137112, 303 15, 303 28, 303 68, 303 84R, B60T 1516, B60T 1546

Patent

active

046452710

ABSTRACT:
A parking brake control device has a differential area shuttle valve which has an outlet connected to a brake actuator and a larger area of a poppet directed to an inlet connected to a control valve for applying a parking brake pressure and a smaller area of the poppet facing a second inlet connected to a service brake pressure such that in the event of simultaneous application of parking brake and service brake pressures the shuttle valve will be moved to close off the inlet to the service brake pressure while introducing park brake pressure to the brake cylinder.

REFERENCES:
patent: 3107681 (1963-10-01), May
patent: 3224455 (1965-12-01), Alfieri
patent: 3410294 (1968-11-01), Heideman et al.
patent: 3507542 (1970-04-01), Cannella
patent: 3957315 (1976-05-01), Cummins et al.
patent: 4057297 (1977-11-01), Beck et al.
patent: 4166654 (1979-09-01), Snodgrass
patent: 4223953 (1980-09-01), Cruse
patent: 4307916 (1981-12-01), Straut et al.
patent: 4400039 (1983-08-01), Ogata

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