SECURITY SYSTEM FOR PREVENTING UNAUTHORIZED USE OF ELECTRIC CIRCUITS

摘要

A coded security system for an electric circuit includes a bank of touch type switches and requires selection of a plurality of the switches in predetermined order to render the circuit effective together with an arrangement for bypassing the security system during servicing or adjustment or other authorized use of the circuits. The bypassing arrangement is coded to require the simultaneous operation of a plurality of the touch switches after the first coded switches have been actuated to render the circuit effective. The circuitry for the system is enclosed in an armored and locked box to prevent tampering or unauthorized alteration of the codes. The system is described as applied to an automobile ignition circuit to prevent unauthorized use of the automobile.