This simple, low cost controller
bypasses the ignition switch when activated by the closure of a
momentary switch. The operator may then remove the ignition key without
shutting the engine down. Movement of the vehicle is prohibited by
interlocking the SAFETY LOCK 4 with a switch operated by the foot
brake, a neutral safety switch on the gearshift or a parking brake
operated switch. Operating any one of these will cause the relays in
the SAFETY LOCK 4 to drop out and interrupt the ignition circuit to
stop the engine. The authorized operator need only insert the key and
turn on the ignition to operate the vehicle. With the key in the lock
and turned on, the ignition circuit is completed as normal and the
opening of the SAFETY LOCK 4 relays haS no effect on engine operation.
The Safety Lock 4 contains 4 realys to permit energizing 3 auxiliary
circuits in addition to the ignition switch bypass.
A Controller that Permits
Unattended Engine Operation but Prevents Unauthorized use of the Vehicle
Simple Installation
Permits Engine to Run with the
Ignition Key Removed
Engine Stops and Cannot be
Restarted if Attempt is Made to Drive Away