Parking brake control apparatus

Details Parking brake control apparatus Parking brake control apparatus

1984-06-22

1986-01-14

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple control

Fluid and electric

303 71, B60T 700, B60T 1370, B60T 1514, B60T 1322

Patent

active

045642451

ABSTRACT:
Parking brake control apparatus on a vehicle equipped with electrofluidic responsive brakes is disclosed. The apparatus comprises a parking brake on the vehicle operable by a cylinder. A source of pressurized fluid provides fluid pressure to the cylinder. The cylinder responds to fluid pressure to release the parking brake and responds to apply the parking brake when fluid pressure is vented. A directional valve connected intermediate the source of fluid pressure and the cylinder controls fluid communication to the cylinder in one position and vents fluid pressure from the cylinder in a second position. Movement to the second position is controlled on one side of the valve by an electrovalve which responds to electrical signals and on the other side by a cylinder which responds to fluid pressure and can only occur when both an electrical signal is below a predetermined minimum and the fluid pressure is reduced.

REFERENCES:
patent: 3456988 (1969-07-01), Gibbons et al.
patent: 3507542 (1970-04-01), Cannella
patent: 4339154 (1982-07-01), Duttarer et al.
patent: 4400039 (1983-08-01), Ogata

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