Means for preventing auto ignition at engine shut down

Claim 1

IN A FUEL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE INCLUDING A CARBURETOR HAVING; A BODY, A MIXTURE CONDUIT FORMED IN SAID BODY, A THROTTLE COMPRISING A PLATE CARRIED ON A SHAFT, THE LATTER BEING JOURNALLED IN THE BODY AND OPERABLE BETWEEN OPEN AND CLOSED POSITIONS TO REGULATE AIR FLOW THROUGH SAID MIXTURE CONDUIT TO CONTROL ENGINE SPEED, LIMITING MEANS FOR LOCATING SAID THROTTLE IN A PARTIALLY OPEN POSITION TO PASS SUFFICIENT AIR AND FUEL MIXTURE THERETHROUGH WHEREBY SAID INTERNAL COMBUSTION ENGINE IS SUSTAINED AT IDLE SPEED, AN IGNITION CIRCUIT INCLUDING A SOURCE OF ELECTRIC CURRENT, AND AN ENGINE STARTER SWITCH, THE LATTER BEING ADJUSTABLE TO "ON" AND "OFF" POSITIONS TO CONTROL OPERATION OF SAID INTERNAL COMBUSTION ENGINE, ELECTRICALLY ACTUATED RELEASE MEANS CONNECTED TO SAID CURBURETOR FOR PERMITTING SAID THROTTLE TO ASSURE A FULLY CLOSED POSITION IN THE MIXTURE CONDUIT THEREBY SUBSTANTIALLY CLOSING THE LATTER TO PRECLUDE FLOW OF AIR-FUEL MIXTURE THERETHROUGH, AND TIMER MEANS CONNECTED TO SAID ELECTRICALLY ACTUATED RELEASE MEANS AND TO SAID IGNITION CIRCUIT RESPECTIVELY TO MAINTAIN SAID RELEASE MEANS IN THE ACTUATED POSITION FOR A PREDETERMINED PERIOD OF TIME SUBSEQUENT TO SAID ENGINE STARTER SWITCH BEING ADJUSTED TO THE "OFF" POSITION TO DISCONTINUE OPERATION OF THE ENGINE.