Aeroquip Corporation

Vickers, Inc.

Joseph Habib

Paul H Nielsen

Paul M Holmes

Michael R Rodman

A linear capacitance displacement transducer for measuring absolute displacement is formed from a coaxial variable capacitor and a precision capacitance measuring electronic circuit. The plates of the coaxial capacitor are attached to the members of an assembly whose displacement relative to one another is to be determined. Linear displacement of the members causes a linear displacement between the capacitor plates which is reflected in a linear capacitance change. A capacitor controlled oscillator utilizes the coaxial variable capacitor at its input. The capacitor controlled oscillator whose period of oscillation is been determined by the capacitance and locked in phase with changes of capacitance is utilized as a precision measure of capacitance. The period of the square wave output of the oscillator is a linear function of the capacitance of the variable capacitor at any time. The transducer may be adapted to determine the absolute position of a piston rod in a hydraulic cylinder.

Linear capacitance displacement transducer

A fitting for connecting a metal conduit to a conventional 37.degree. flared adapter which does not require flaring of the conduit, and constitutes a compression type fitting utilizing a radially contractable ferrule and compression nut. Metal-to-metal sealing contact is achieved, and no modification of the conduit is required.

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Jackson, MI, United States of America

Joseph Habib