Air operated diaphragm spring brake

Details Air operated diaphragm spring brake Air operated diaphragm spring brake

1986-12-03

1989-08-29

Garrett, Robert E.

Expansible chamber devices

Relatively movable working members

First working member moves second coaxial working member...

92 64, 92 94, 92167, F01B 700

Patent

active

048606405

ABSTRACT:
An air-operated spring brake of the type wherein a spring-operated brake actuator is in tandem with an air-operated service brake actuator has a spring diaphragm which separates a spring housing into a fluid pressure chamber and a spring chamber. A spring in the spring chamber bears against a pressure plate to bias the diaphragm longitudinally in the spring housing in a brake-applying direction upon a decrease in pressure in the fluid pressure chamber. The diaphragm is movable generally longitudinally in the other direction to compress the spring in the presence of pressure in the fluid chamber to allow operation of the service brake actuator independently of the spring-operated actuator. A push plate, mounted to a push member, moves reciprocally with the diaphragm in the fluid pressure chamber in abutting relationship to the spring diaphragm. A boss on one side of the spring diaphragm fits snugly within an opening in the spring pressure plate to prevent lateral shifting of the spring diaphragm with respect to the pressure plate when the two are in contact with one another. Alternatively, or in addition, a ring on the pressure plate side of the spring diaphragm abuts a peripheral surface of the spring pressure plate to prevent lateral shifting of the spring diaphragm with respect to the pressure plate when the two are in contact with one another. A second ring on the other side of the diaphragm abuts a peripheral surface of the push plate to prevent lateral shifting of the diaphragm with respect to the push plate when the two are in engagement with one another.

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