Expansible chamber devices – Collapsible chamber wall portion – Wall portion formed of flexible material
Patent
1983-06-16
1985-03-19
Garrett, Robert E.
Expansible chamber devices
Collapsible chamber wall portion
Wall portion formed of flexible material
92 59, 92 99, 92130D, 267179, F01B 1902, F16F 106
Patent
active
045051887
ABSTRACT:
A pneumatic positioner with a casing composed of a shell-like bottom part and a shell-like cover part. A membrane plate, is connected through a gas-tight membrane with the side walls of the casing so as to be movable back and forth in the casing in the direction of a drive spindle which is disposed in sealing relationship through the bottom part of the casing. In the bottom part and/or in the cover part, there are arranged one or more gas-conducting connecting pieces. In the casing there are arranged coil springs for producing biasing or restoring forces. These springs abut, on the one hand, the membrane plate and, on the other hand, the bottom part or cover part. On the membrane plate of one embodiment there is provided for each coil spring at least two supporting surfaces which present different spacings from a plane perpendicular to the direction of motion of the drive spindle and upon which the coil springs are replaceably disposed. In this manner it is possible to vary the restoring forces, without its being necessary to change either the number of coil springs or the spring constant of the coil springs then in use.
REFERENCES:
patent: 2781776 (1957-02-01), Gratzmuller
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patent: 3815471 (1974-06-01), Kobelt
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patent: 4258611 (1981-03-01), Detweiler
Hannen Ulrich
Paetzel Herbert
Weydt Willy V. D.
Gabala James A.
Garrett Robert E.
Gealow Jon Carl
Gilroy Hugh
Li H. Edward
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