Importance

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Abstract

An anti-theft device for a vehicle having an internal combustion engine provided with an electrical circuit constituting an ignition or engine-heating circuit. The device includes a first circuit member having an output, a second circuit member having an input, the first and second circuit members being parts of the electrical circuit. A plurality of magnetic switches are disposed in a housing. One or more of the magnetic switches are electrically connected in series between the output of the first circuit member and the input of the second circuit member, all remaining ones of magnetic switches are connected between the input of said second circuit member or the output of the first circuit member and ground of the electrical circuit. One or more magnets are carried on a support in the form of a key which can be inserted into a slot in the housing. When the key is in place in the housing, the magnet or magnets are adjacent respective ones of the magnetic switches which are to be closed to effect connection between the two circuit members. At the same time, those portions of the key adjacent the other magnetic switches are free of magnets.

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First Claim