Brakes – Operators – Electric and mechanical
Patent
1978-05-03
1979-11-27
Reger, Duane A.
Brakes
Operators
Electric and mechanical
188162, F16D 6536
Patent
active
041756460
ABSTRACT:
A hydraulic parking brake with an electric actuator is provided for an automotive vehicle and is adapted for use with a hydraulic brake system in the vehicle. A manually operated switch engages an electric motor which drives a ram to increase hydraulic pressure to force the caliper pads or brake shoes of a brake into engagement with a brake disk or drum. The electric motor is equipped with associated limit switches, which disengage the motor following operation to prescribed limits. A torsion spring is part of the mechanism that activates the hydraulic master cylinder. This spring holds hydraulic pressure within a range of pressure values adequate to hold the brake and still avoid damage to the brake components. This ensures that the electric motor can travel far enough to activate the limit switches.
REFERENCES:
patent: 2251521 (1941-08-01), McIntyre et al.
patent: 2403870 (1946-07-01), Martin
patent: 2672223 (1954-03-01), Butler
patent: 2734590 (1956-02-01), Hays
patent: 2933159 (1960-04-01), Steibinger
patent: 3204725 (1965-09-01), McGraw
patent: 3915260 (1975-10-01), Kim
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