Electrical measuring instrument

Details Electrical measuring instrument Electrical measuring instrument

G - Physics

08

C

340/136.1

G08C 21/00 (2006.01)

Patent

CA 1210109

ELECTRICAL MEASURING INSTRUMENT Abstract A modular analog/digital display for use in a cylindrical aircraft instrument housing is designed to enable the digital components to be assembled without interference to the analog meter mechanism. The digital display is of the leadless type and is clamped under compression to a circular circuit board with a pair of contact strips in registration with contacts formed on the circuit board and digital display. The design also features a screw-on dial pointer which facilitates the assembly of the digital display components and dial to the analog meter mechanism without interference. The pointer includes an externally threaded shaft attached at right angles thereto and a locknut threaded over the threaded pointer shaft. An internally threaded bushing is fastened within one end of the hollow meter shaft. An analog dial, having a central opening for accommodating the meter shaft, is slipped over the meter shaft and mounted to the meter mechanism housing or other components. The pointer shaft is then screwed into the bushing, which acts to stiffen the thin-walled shaft, until the pointer is at a desired angular position and distance relative to the dial. The locknut is turned until it is seated on the bushing to secure the pointer at the desired position.

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