Title: Shoe drum brakes for vehicles

Abstract: An internal shoe-drum brake in which arcuate shoes carrying friction linings for engagement with a rotatable drum are mounted on a stationary back-plate and the shoes are separated at one end to bring them into engagement with the drum by a service actuator for normal service braking and at the other end by a mechanical parking actuator. Abutments are provided at or adjacent to the mechanical parking actuator to take the braking loads when the brake is applied by the service actuator, and means are provided in or adjacent to the service actuator for transmitting servo braking forces from one shoe to the other when the brake is applied by the mechanical parking actuator. An actuating member is operative to actuate the parking actuator to release energy stored therein thereby applying continuously to the shoes a force to urge them into engagement with the drum irrespective of the initial position of the shoes when the actuating member is operated.

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Inventors: Farr, Glyn Phillip Reginald (Kenilworth, EN)

Application Number: 613328
Filing Date: 1975-09-15
Publication_date: 1976-08-31
Assignee: Girling Limited (Birmingham, EN)
Primary Class(es): 188/106A 188/196D, 188/326, 188/342
Other Classes:
US Patent Ref:

2140741	Dec, 1938	Goepfrich	188/368.
2293600	Aug, 1942	Eksergian	188/106.
2385812	Oct, 1945	Hoyt	188/16.
2598609	May, 1952	Samuel	188/364.
2619203	Nov, 1952	Shaw	188/326.
3322241	May, 1967	Cox et al.	188/170.
3463276	Aug, 1969	Brooks	188/170.
3752266	Aug, 1973	Chouings	188/106.

Other Refs:
Primary Examiner: Reger, Duane A.
Assistant Examiner:
Attorney: Scrivener Parker Scrivener and Clarke