Combined parking and service brake system

Details Combined parking and service brake system Combined parking and service brake system

1981-12-30

1984-01-31

Reger, Duane A.

Fluid-pressure and analogous brake systems

Multiple control

303 2, B60T 1118

Patent

active

044286210

ABSTRACT:
A system suitable for positively holding an earthmover in a fixed position during excavating or loading operation, comprising a first air reservoir in communication with a parking brake via a parking control valve. A second air reservoir communicates with front and rear wheel brake cylinders via a dual brake control valve assembly and pneumatic-to-hydraulic converters. A pilot-operated source selector valve coacts with shuttle valves to normally allow communication between the brake control valve assembly and the converters and, upon application of the parking brake by the parking control valve, to place the first air reservoir in communication with the converters. Thus the actuation of the parking control valve results in the application of not only the parking brake but also the service brakes. Interposed between the converters and the brake cylinders, pilot-operated brake locking valves also respond to the actuation of the parking control valve for holding the service brakes applied by permitting fluid flow only in a direction from the converters to the brake cylinders.

REFERENCES:
patent: 3802746 (1974-04-01), Walser
patent: 4003605 (1977-01-01), Fannin
patent: 4293164 (1981-10-01), Hoefer et al.

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