Vandal resistant telephone keypad switch

Details Vandal resistant telephone keypad switch Vandal resistant telephone keypad switch

H - Electricity

01

H

306/305

H01H 13/70 (2006.01) H01H 13/702 (2006.01) H04M 1/23 (2006.01)

Patent

CA 1280795

ABSTRACT A shielded electrical switch includes a pressure- actuated switch comprised of three layers, the top and bottom layer of which are electrically-conductive and the intermediate layer of which is a spacer layer containing apertures at the switch points. A sealing membrane is coupled over the layered switch, the membrane having thickened push-button supports overlying the switch points. The thickened push-button supports are spaced from the membrane via frustro-conical mounting portions on the membrane. This frustro-conical mounting gives the buttons the sufficient "feel" or resistance when depressed, and also insures that the switch-actuating portions of the membrane will make contact with the upper surface of the switch to insure that the switch points of the upper and lower layers of the switch will make contact via the intermediate layer. The membrane and the sealed, layered switch are, in turn, enclosed in an armored, sealed push-button enclosure. The entire assembly is thus a highly vandal-resistant, low-cost, push-button switch.

522511

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