Temperature-compensated pressure-responsive instrument
Abstract
Abstract A PRESSURE-RESPONSIVE INSTRUMENT SUCH AS AN ALTIMETER HAVING THE FOLLOWING THREE TEMPERATURE-COMPENSATING FEATURES: (1) THE ANEROID CAPSULE HUB ASSEMBLY HAS A CUPSHAPED HUB ELEMENT WHOSE CONTRACTION MATCHES THE EXPANSION OF THE FITTINGS OF THE CAPSULE HUB ASSEMBLY. (2) THE CONNECTING LINKAGE BETWEEN THE HUB ELEMENT AND THE SHAFT DRIVEN THEREBY IS MADE OF MATERIALS HAVING A TEMPERATURE COEFFICIENT OF EXPANSION SELECTED TO MATCH THAT OF THE CAPSULE AS MOUNTED. (3) THE SHAFT AT THE POINT OF ATTACHMENT OF THE CONNECTING LINKAGE IS DISPLACED TO COMPENSATE FOR THE THERMAL DISPLACEMIENT OF THE INSTRUMENT FRAME, PREFERABLY BY MOUNTING ONE BEARING OF THE SHAFT ON AN ANNULAR RING HAVING A DIFFERENT COEFFICIENT TO EXPANSION FROM THAT OF THE FRAME AT ABOUT 90* FROM THE TWO DIAMETRICALLY-OPPOSITE POINTS OF ATTACHMENT OF THE RING TO THE FRAME.
Inventors
- 👤 Graham A Ireland
Bibliographic Details
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