Spring brake actuator with mid-located spring

Details Spring brake actuator with mid-located spring Spring brake actuator with mid-located spring

2004-12-16

2009-02-24

King, Bradley T (Department: 3657)

Brakes

Operators

Fluid pressure

C188S170000

Reexamination Certificate

active

07493994

ABSTRACT:
A spring-type brake actuator for a pneumatically-operated vehicle brake is provided, with a brake actuator spring located on a front side of the actuator's intermediate flange, between a service brake actuator and a parking brake release actuator. The spring is captured between the intermediate flange and a retaining plate which is connected to the parking brake release actuator via a shaft through the intermediate flange. Because the retaining plate and parking brake release actuator are connected to one another on opposite sides of the intermediate flange, spring expansion is checked, thereby increasing safety during actuator production and servicing by virtually eliminating the potential for uncontrolled spring energy release. The actuator configuration also reduces structural loads on the rear portion of the housing and shifts spring and housing weight closer to the vehicle brake, permitting simpler designs and use of alternative materials, such as plastic or aluminum to lower costs.

REFERENCES:
patent: 3065997 (1962-11-01), Frankhouser et al.
patent: 3136227 (1964-06-01), Williams
patent: 3149542 (1964-09-01), Cruse
patent: 3394779 (1968-07-01), Heinz et al.
patent: 3563139 (1971-02-01), Page et al.
patent: 3576152 (1971-04-01), Chevreux
patent: 3796138 (1974-03-01), Doyle et al.
patent: 3813994 (1974-06-01), Swander et al.
patent: 3842716 (1974-10-01), Swander, Jr.
patent: 3977308 (1976-08-01), Swander, Jr. et al.
patent: 4777867 (1988-10-01), Severinsson et al.
Canadian Patent Office communication dated Jul. 14, 2008.

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