Motor vehicles – With means for promoting safety of vehicle – its occupant or... – Responsive to absence or inattention of operator – or...
Patent
1984-10-03
1986-02-25
Bertsch, Richard A.
Motor vehicles
With means for promoting safety of vehicle, its occupant or...
Responsive to absence or inattention of operator, or...
188151R, 188170, 192 3R, 303 19, 303 28, B60K 2708
Patent
active
045723192
ABSTRACT:
The invention provides a parking brake system for automotive or delivery type vehicles, golf carts, etc. that applies the emergency or parking brake automatically after the engine is turned off or if other pre-determined conditions are met, such as, but not limited to, the driver leaving the seat or hydraulic brake failure.
Several other pre-determined conditions can be integrated into the system to stop or retard the release of the parking brake such as door not properly closed, seat belt not properly in use, etc.
An electronic time delay pack can be incorporated with a seat switch to allow for driver bounce on rough terrain.
A one-way check valve is connected between the intake manifold and the actuator. This check valve opens fully when the engine is running and allows the vacuum to compress the actuator and release the parking brake. The check valve closes when the engine is turned off and the check valve retards the sudden return of atmospheric pressure to the actuator, thus preventing lock-up at speed. After a time delay caused by the check valve and actuator leakage, atmospheric pressure returns to the actuator allowing a safe controlled application of the parking brake.
REFERENCES:
patent: 2907415 (1959-10-01), Norman
patent: 3402792 (1968-09-01), Masser
patent: 3487451 (1969-12-01), Fontaine
patent: 3500946 (1970-03-01), Boyajian
patent: 3674321 (1972-07-01), Fontaine
patent: 3790223 (1974-02-01), Fontaine
patent: 4336860 (1982-06-01), Noller et al.
patent: 4389154 (1983-06-01), Minor et al.
Bertsch Richard A.
Fail Safe Brake Corporation
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