Vehicle anti-theft system

Claim 1

In a vehicle anti-theft ignition controlling system of the type disabling the ignition of said vehicle in accordance with the condition of an on-off switch of said circuit, the improvement in said circuit comprising the use as said on-off switch of a cooperating pair of electrical contacts consisting of a first stationary contact and a second movable contact normally in a spaced clearance position therefrom so as to correspondingly provide said switch with a normally open condition, a switch mounting member in the form of a hollow tube bounding a cylindrical operative compartment oriented lengthwise thereof having a first opening at a distal end of said compartment and a second opening at an opposite proximal end thereof, said pair of contacts being mounted in said distal end first opening of said compartment and said hollow tube being attached with said proximal end second opening to a dashboard of said vehicle, so as to position said pair of contacts in a rearwardly spaced relation behind said dashboard, said dashboard having an opening in communication with said compartment proximal end second opening, and a probe sized to project into said compartment and electrically close said contacts, whereby the presence of said on-off switch is undetectable except for said dashboard opening.