Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Patent
1993-05-05
1997-07-22
Denion, Thomas E.
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
92 63, 116208, 116285, 116303, 188 111, F01B 2526
Patent
active
056494696
ABSTRACT:
An air-operated combination diaphragm spring brake has a service chamber in tandem with a spring chamber. The service chamber being separated into an upper and lower section by a first elastomeric diaphragm. The spring chamber is separated into upper and lower sections by a second elastomeric diaphragm. A lever type stroke indicator is positioned within either or both the lower sections of the service chamber and the spring chamber.
The stroke indicator in the service chamber pivots about a pin when contacted by a plate associated with the service push rod when the brakes are applied, resulting in a portion of the stroke indicator to extend beyond the periphery of the service chamber housing and provide a visual indication of the need to inspect the brake system.
The stroke indicator in the lower section of the spring chamber also pivots about a pin when contacted by the pressure plate of the spring chamber resulting in a portion of the lever striking a pin which will then extend beyond the periphery of the service chamber housing, to provide a visual indication of the need to inspect the brake system. Simultaneously, another portion of the lever uncovers an opening to a passage between the lower section of the spring chamber and the atmosphere, which is sealed by a cap. The pressurized air within the lower section is great enough to blow away the cap to provide a second visual indication and the pressurized air exiting through the opening creates a high pitched whistle to provide an audible stroke indicator.
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Denion Thomas E.
NAI Anchorlok Inc.
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