Vacuum relief device for internal combustion motors

Claim 1

IN AN AUTOMOTIVE VEHICLE HAVING AN INTERNAL COMBUSTION MOTOR WITH AN INTAKE MANIFOLD AND A THROTTLE MOVABLE BETWEEN AN IDLING POSITION AND A FULL POWER POSITION; AN AIR DUCT OPENING INTO SAID INTAKE MANIFOLD, A VALVE IN SAID AIR DUCT, AND MEANS RESPONSIVE TO OPENING AND CLOSING MOVEMENTS OF SAID THROTTLE FROM ANY POSITION THEREOF FOR CLOSING AND OPENING SAID CONTROL VALVE, SAID MEANS INCLUDING A RACK WITH A SERIES OF TEETH MOVABLE BACK AND FORTH IN STEP WITH OPENING AND CLOSING MOVEMENTS OF SAID THROTTLE, A ROCKABLY MOUNTED CLICK COMPRISING A STRAIGHT TONGUE ADAPTED TO EXTEND FROM ITS ROCKING AXIS INTO THE SPACE BETWEEN THE NEAREST TWO TEETH OF SAID RACK WHEN IN ITS MIDPOSITION, SAID CLICK BEING ROCKABLE FROM ITS MIDPOSITION IN EITHER DIRECTION BY MOVEMENTS OF SAID RACK, SPRING MEANS TENDING TO HOLD SAID CLICK IN ITS MIDPOSITION, AND LINKAGE OPERATIVELY CONNECTING SAID CLICK AND SAID VALVE.