Expansible chamber devices – Relatively movable working members – First working member moves second coaxial working member...
Patent
1997-03-07
1998-11-17
Oberleitner, Robert J.
Expansible chamber devices
Relatively movable working members
First working member moves second coaxial working member...
188170, F16D 6524, F01B 700
Patent
active
058362339
ABSTRACT:
A pneumatic spring brake for an automotive vehicle has a housing formed of a spring chamber head and an adapter head, and has a spring brake diaphragm, a power spring, and a spring plate. The spring chamber head is a generally bowl-shaped structure having an end wall and a surrounding, generally frustoconical side wall. The surrounding side wall of the spring chamber head is formed with a plurality of vent or breather openings therein. According to the improvement of the invention, the spring brake diaphragm is configured so as to cover and seal all of the breather openings when the power spring is compressed in its caged position. Preferably, a guide mechanism is employed to ensure that the power spring remains in coaxial alignment with the service brake push rod, and to prevent any misalignment of the spring brake diaphragm from occurring within the confines of the spring chamber head and adapter head. Preferably also, the spring chamber head is provided with a caging tool access opening to allow the power spring to be mechanically caged prior to sealing or unsealing the mating rims of the adapter head and the spring chamber head. A simple check valve, in the form of a rubber stopper with one-way air passages defined therein, is located in the caging tool access opening in the spring chamber head.
REFERENCES:
patent: 3479927 (1969-11-01), Woodward
patent: 3625117 (1971-12-01), Tazelaar
patent: 3630093 (1971-12-01), Mouse
patent: 3977308 (1976-08-01), Swander, Jr. et al.
patent: 5215170 (1993-06-01), Rapa
patent: 5623862 (1997-04-01), Hanaway et al.
patent: 5664478 (1997-09-01), Pierce
Oberleitner Robert J.
Schwartz Chris
Thomas Charles H.
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