Ignition control apparatus

Claim 1

IN AN APPARATUS FOR CONTROLLING THE SPARK ADVANCE OF AN INTERNAL COMBUSTION ENGINE HAVING A TUBE FOR SUPPLYING COMBUSTIBLE GASES TO THE ENGINE INTAKE MANIFOLD WITH A THROTTLE VALVE MOUNTED IN SAID TUBE TO PIVOT ABOUT A SUBSTANTIALLY DIAMETRICAL AXIS FROM A SUBSTANTIALLY CLOSED IDLING POSITION AND A DISTRIBUTOR WITH A VACUUM CHAMBER TO EFFECT SPARK ADVANCE IN ACCORDANCE WITH THE DEGREE OF VACUUM ACTING IN SAID CHAMBER; THE COMBINATION OF A FIRST PIPE OPENING FROM SAID TUBE AT ONE SIDE OF SAID AXIS AT A LOCATION WHICH IS ADJACENT, AND DOWNSTREAM WITH RESPECT TO SAID THROTTLE VALVE IN SAID INDLING POSITION AND PAST WHICH THE RESPECTIVE SIDE OF SAID THROTTLE VALVE IS DISPLACED UPON PIVOTAL MOVEMENT OF THE LATTER FROM SAID IDLING POSITION, A SECOND PIPE OPENING FROM SAID TUBE AT THE OTHER SIDE OF SAID AXIS AT A LOCATION WHICH IS UPSTREAM WITH RESPECT TO SAID THROTTLE VALVE IN THE IDLING POSITION THEREOF AND PAST WHICH THE RESPECTIVE SIDE OF SAID THROTTLE VALVE IS DISPLACED UPON PIVOTAL MOVEMENT OF THE LATTER FROM SAID IDLING POSITION, A COMMON PIPE FOR SELECTIVELY CONNECTING SAID FIRST AND SECOND PIPES TO THE VACUUM CHAMBER OF THE DISTRIBUTOR, AND VALVE MEANS INTERPOSED BETWEEN SAID FIRST AND SECOND PIPES AND SAID COMMON PIPE AND BEING RESPONSIVE TO THE RELATIVE PRESSURES IN SAID FIRST AND SECOND PIPES TO ESTABLISH COMMUNICATION OF SAID COMMON PIPE WITH THE ONE OF SAID FIRST AND SECOND PIPES IN WHICH THE RELATIVELY LOWER ABSOLUTE PRESSURE EXISTS.