Transistorized ignition system for internal combustion engines

Claim 1

SPARK IGNITION APPARATUS FOR AN INTERNAL COMBUSTION ENGINE COMPRISING A SPARK GENERATING CIRCUIT FOR SUPPLYING SPARKS TO THE PLUGS OF THE ENGINE IN TURN, TRIGGER CIRCUIT MEANS CONNECTED TO SAID SPARK GENERATING CIRCUIT AND WHICH WHEN BIASED BY AN INPUT PERMITS SAID SPARK GENERATING CIRCUIT TO PRODUCE A SPARK, A CONTINUOUSLY OPERATING FIXED-FREQUENCY OSCILLATOR FOR PROVIDING THE BIASING INPUT TO SAID TRIGGER CIRCUIT MEANS, MAGNETIC MEANS DRIVEN BY THE ENGINE FOR PREVENTING SAID OSCILLATOR FROM PROVIDING SAID BIAS INPUT EXCEPT WHEN A SPARK IS REQUIRED, SAID FIXED FREQUENCY OSCILLATOR BEING CONSTITUTED BY A BLOCKING OSCILLATOR HAVING A TRANSISTOR WITH BASE AND COLLECTOR CIRCUITS FORMING PART THEREOF WITH TRANSFORMER WINDINGS IN THE BASE AND COLLECTOR CIRCUITS OF SAID TRANSISTOR, AND SAID TRIGGER CIRCUIT MEANS BEING CONSTITUTED BY A SECOND BLOCKING OSCILLATOR COMPRISING A TRANSFORMER HAVING WINDINGS IN THE COLLECTOR AND BASE CIRCUITS OF SAID TRANSISTOR USED IN SAID FIXED FREQUENCY OSCILLATOR, THE ARRANGEMENT BEING SUCH THAT THE FIRST-MENTIONED BLOCKING OSCILLATOR ALONE DOES NOT STATURATE SAID TRANSISTOR, BUT SAID TRANSISTOR BECOMES SATURATED WHEN THE SECOND BLOCKING OSCILLATOR OPERATES.