Vehicle antitheft device

A vehicle anti-theft device for enabling and disabling the starting and ignition systems associated with a vehicle engine comprising:

• a relay-operated switch interposed in the starting circuit;
• a multi-position code input switch having an indicia display for each position of the switch, said switch having an input terminal connected to the battery and a plurality of output terminals;
• a primary of the output terminals being connected to the ignition circuit;
• said relay being connected to the battery through a self-locking gate constructed and arranged to be switched to a conductive configuration and to remain in said conductive configuration as long as current flows therethrough;
• said gate having an actuating input terminal connected to a different, secondary of the output terminals of said code input switch thereby requiring the code input switch to first be set to its secondary position to enable the starting circuit and then returned to its primary position to enable the ignition circuit;
• a second multi-position code input switch interposed in the ignition circuit and connected to be closed in only one position thereof;
• a third multi-position code input switch interposed in the ignition circuit, all but one of the output terminals of said third switch being shorted together to ground thereby to short out the ignition except when said third switch is in a predetermined position;
• and
• a fourth multi-position code input switch interposed between the gate and the relay.

A vehicle anti-theft device for enabling and disabling the starting and ignition circuits associated with a vehicle engine comprising:

• a relay-operated switch interposed in the starting circuit;
• a multi-position code input switch having an indicia display for each position of the switch, said switch having an input terminal connected to the battery and a plurality of output terminals;
• a primary of the output terminals being connected to the ignition circuit;
• said relay being connected to the battery through a self-locking gate constructed and arranged to be switched to a conductive configuration and to remain in said conductive configuration as long as current flows therethrough;
• said gate having an actuating input terminal connected to a different, secondary of the output terminals of said code input switch thereby requiring the code input switch to first be set to its secondary position to enable the starting circuit and then returned to its primary position to enable the ignition circuit;
• a second multiposition code input switch interposed in the ignition circuit, all but one of the output terminals of said third switch being shorted to ground thereby to disable the ignition circuit except when said third switch is in a predetermined position;
• first impedance means interposed between the gate and the relay;
• and
• means connecting the primary output contact including a second impedance therein, said impedances being selected to require the additive effect of current flowing therefrom to the relay to initiate actuation of the relay, thereby to require setting of the second code input switch to its predetermined position before operating said first code input switch.