Electrical proximity switch arrangements

Details Electrical proximity switch arrangements Electrical proximity switch arrangements

H - Electricity

01

G

340/124.2

H01G 9/00 (2006.01) H03K 17/955 (2006.01) H03K 17/96 (2006.01)

Patent

CA 1038947

ABSTRACT OF THE DISCLOSURE An arrangement for modular mounting of a plurality of proximity switches comprises a plate of insulating material having a plurality of first conductive plates mounted on its front face. A respective housing containing a switch circuit is replaceably mounted to the rear face of the plate of insulating material in correspondence with each first conductive plate. Each housing contains a second conductive plate which, in conjunction with the associated first conductive plate, forms a parallel-plate capacitor. The dielectric of the capacitor is formed by the plate of insulating material, a flat wall of the housing which the second conductive plate lines, and an air gap between the plate and the flat wall. Touching of the second plate by a user varies the capacity of the capacitor thus generating a signal operating the circuit within the housing. Since the two plates of the capacitor are mutually isolated, the user cannot experience an electric shock. The housing may be mounted in the rear face of the plate of insulating material either direct or by way of an intermediate supporting frame.

224406

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