Parking brake control valve dual actuating device

Details Parking brake control valve dual actuating device Parking brake control valve dual actuating device

1989-07-12

1990-12-25

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

74479, 303 10, 303 13, 192 4A, B60T 1516, B60T 1318

Patent

active

049797832

ABSTRACT:
A control valve for a vehicle parking brake system is controlled by a pair of camming mechanisms, one of which is controlled by the shift lever of the vehicle automatic transmission and the other of which is controlled by a manual control knob in the vehicle operator's compartment. Camming mechanisms control the valve such that the parking brakes on the vehicle are always applied when the shift lever is disposed in the "Park" position, but the vehicle parking brakes can be applied or released manually by manipulation of the control knob when the shift lever is placed in one of the other positions other than the "Park" position along the shift quandrant of the automatic transmission.

REFERENCES:
patent: 2164692 (1939-07-01), Bahr
patent: 2310802 (1943-02-01), Mercier
patent: 2366173 (1945-01-01), Boldt
patent: 2725129 (1955-11-01), Martin
patent: 3136399 (1964-06-01), Granryd
patent: 3635317 (1972-01-01), Crabb et al.
patent: 4211314 (1980-07-01), Clason
patent: 4350227 (1982-09-01), Knoche
patent: 4454936 (1984-06-01), Wise
patent: 4875563 (1989-10-01), Larson et al.

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