Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1996-02-28
1998-08-18
Marmor, Charles A.
Machine element or mechanism
Control lever and linkage systems
Elements
74512, B60T 704, G05G 114
Patent
active
057944920
ABSTRACT:
A parking brake actuator comprises a pedal lever mounted on a support bracket for pivotal movement between brake-release and brake-apply positions to release and apply a parking brake. A sector carried by the pedal lever engages a pinion rotatably mounted on the mounting bracket. A torsion clutch spring has one end fixed to the support bracket and a free end, and normally grips and locks the pinion against reverse rotation when the vehicle transmission is in PARK to enable the parking brake to be locked in applied position. A release lever is operable by a bistable solenoid when the transmission selector is moved out of PARK to expand the torsion clutch spring out of engagement with the pinion to prevent locking of the parking brake. A torsion latch spring has legs which embrace the lever in pinion release position and grips a stud with a greater force to block lever movement out of pinion release position after the solenoid is deenergized. This permits the parking brake to be modulated for use as an emergency brake. When the solenoid is reenergized by shifting the transmission selector out of PARK, it moves the release lever out of pinion release position, engaging one spring leg to forcibly rotate the torsion latch spring out of blocking position, which allows the torsion clutch spring to reengage the pinion.
REFERENCES:
patent: 3236120 (1966-02-01), Fender
patent: 3358797 (1967-12-01), Walton
patent: 5029681 (1991-07-01), Swiatek
Battista Mary Ann
Dura Automotive Systems Inc.
Greenlee David A.
Marmor Charles A.
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