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 the foot brake, a neutral safety switch on the
gearshift or a parking brake operated switch. Operating any one of
these will cause the relay in the SAFETY LOCK 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 relay has no
effect on engine operation.
A Controller that Permits Unattended Engine Operation but
Prevents Unauthorized use of the Vehicle Simple
Engine to Run with the Ignition Key Removed Engine
Stops and Cannot be Restarted if Attempt is Made to