Antitheft device for vehicles

Claim 1

In combination with a motor vehicle having an engine, a battery having a first pole and a second pole, and a starter solenoid contactor, wherein said first pole is connected to said vehicle frame and said starter solenoid contactor is connected to said second pole, an antitheft device comprising: a. an electrical starter assembly having a casing in which is mounted said electrical starter assembly including, electrical means for starting said engine, said electrical starting means having first and second terminals and means for engaging a flywheel, said first terminal being connected to said vehicle frame, a grounding contact connected to said vehicle frame, a power control contact connected to said starter solenoid contactor, a movable contactor arm resting on said grounding contact when said antitheft device is in a locked mode and contacting said power control contact when said antitheft device is in an unlocked mode, said movable contactor arm being connected to said second terminal of said electrical starting means, servo means having a link connected for moving said movable contactor arm from the grounding contact to said power control contract, a coder/decoder connected to said servo means; b. an ignition key switch having third and fourth terminals, wherein said third terminal is electrically connected to said second pole of said battery, and said fourth terminal is electrically connected to said coder/decoder for operating said coder/decoder to generate a first code signal in response to said key ignition switch being in a start position; and c. a processor having a coder and a memory, said processor being connected between said key ignition switch and said coder/decoder, said processor including a key pad for generating a second code signal in response to recognizing said first code signal, said processor including means responsive to a correspondence between said first and second code signals for operating said servo means to move said movable contactor arm into engagement with said power control contact to apply current to said starting means.