Geometrical instruments – Distance measuring – Environmental isolation
Patent
1989-12-22
1991-07-09
Cuchlinski, Jr., William A.
Geometrical instruments
Distance measuring
Environmental isolation
33707, 74 182, 267 6427, 267122, 277 3, 277200, 277212B, 403 50, F16J 1550, F16F 500, G01B 1100
Patent
active
050294016
ABSTRACT:
A seal for a linear displacement optical transducer has a tubular flexible bellows which is joined at one end to a movable carriage supporting an optically encoded track and which is movable along a cylinder supporting an optical read head. The bellows extends within the cylinder and has its other end sealed to an open end of the cylinder. A compensation chamber is sealed to the outside of the cylinder to enclose a major part of the length of the bellows and forms a sliding seal with a push-rod extending from a carriage. The bellows encloses a first volume of the dry inert gas within the cylinder to one side of the bellows and a second, similar volume of gas on the other side of the bellows and in the compensation chamber. Displacement of the carriage causes only a small change in pressure across the bellows which is accommodated by flexure. The compensation chamber isolates the bellows from atmospheric pressure change and ensures that temperature change affects both volume equally, minimizing pressure difference across the bellows.
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Cuchlinski Jr. William A.
Cummings Scott
Smiths Industries Public Limited Company
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