Fluid-pressure and analogous brake systems – Locks
Patent
1979-07-13
1981-06-16
Reger, Duane A.
Fluid-pressure and analogous brake systems
Locks
92 28, B60T 1716, 303
Patent
active
042733880
ABSTRACT:
An air brake safety and parking mechanism is provided in the form of an emergency braking system which operates automatically to set and latch the air brakes of a vehicle in a braking position whenever the air pressure of the service braking system of the vehicle drops below a predetermined threshold, and which may be set and released mechanically for parking purposes. The air brake safety mechanism of the invention includes an antifriction ball screw coupled to the air brake piston in the air brake chamber of the vehicle braking system, and extending along a selected axis into an air-tight housing which is mounted adjacent to the brake chamber. A ball nut is rotatably mounted in the housing in threaded relationship with the screw to permit linear movement of the screw in both directions along the selected axis so long as the nut is freely rotatable. A latch engages the nut should the service pressure drop below a predetermined threshold to prevent rotation of the nut and, thereby, to prevent linear movement of the screw, so as to set and lock the air brakes of the vehicle.
REFERENCES:
patent: 3472124 (1969-10-01), Roselius et al.
Beecher Keith D.
Reger Duane A.
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