F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
251/12, 121/78
F15B 15/00 (2006.01) F15B 15/10 (2006.01)
Patent
CA 1217099
MID-12137 Abstract of the Disclosure 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 mem- brane 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 party 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 embodi- ment 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.
431063
Hannen Ulrich
Paetzel Herbert
Weydt Willy V.d.
Mcgraw-Edison Company
Shapiro Cohen
LandOfFree
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