Safety parking brake for automatic transmissions

Details Safety parking brake for automatic transmissions Safety parking brake for automatic transmissions

1983-09-02

1985-05-21

Krizmanich, George H.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

188 31, B60K 6700, B60K 4126

Patent

active

045180660

ABSTRACT:
Sudden accidental or unintended movement of an automatic transmission into reverse with the engine running is prevented by substituting for the usual unitary control rod a two part arrangement, one being movable by the shift lever and the other being movable by a spring separator from the shift lever but arranged to exert a force only in the direction of a parking pawl and never in the reverse direction against any member connected to the detent plate. Thus it is impossible for a yielding cam spring to ever drive the linkage unexpectedly into reverse should a driver carelessly position a shaft lever between its reverse and park positions.

REFERENCES:
patent: 3601231 (1971-08-01), Kolacz
patent: 4369867 (1983-01-01), Lemieux
patent: 4413712 (1983-11-01), Richard
Automatic Transmission Park System Review, Ford Motor Company, Dec. 20, 1978.

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