Shutoff apparatus for internal combustion engines

Claim 2

A circuit for grounding an induction coil in an ignition system, said circuit comprising: a normally open switch for providing a path to ground when closed and for energizing the circuit and for causing the coil to be grounded when closed, a delay portion of the circuit having a first resistor to delay voltage buildup a predetermined amount and having a capacitor in series with said first resistor, a biased and stabilizing portion of the circuit in parallel with said delay portion and having a unijunction transistor connected to said delay portion to the operated after said delay, an SCR being in series with said normally open switch when closed, said SCR having a gate, said transistor being adapted to provide reduced voltage to the gate to fire said SCR when said normally open switch is closed and after said delay, and a relay in series with said SCR and being adapted to close a relay operated first switch to close the circuit to ground said coil.

Claim 3

The invention according to claim 1 including: a second switch operated by said relay, and being in parallel with said first switch, said second switch being directly connected to the ignition system power source so as to be adapted to continue to ground the coil after being closed when the ignition switch is open.

Claim 4

The invention according to claim 1 including: a second normally open switch for providing a path to ground when closed and for causing the coil to be grounded when closed independently of the first normally open switch.

Claim 7

In an ignition system for spark-fired internal combustion engines, engine shutoff apparatus including ignition circuitry having an ignition switch, an induction coil having a primary and a secondary circuit, a timer having a switch and capacitor, a distributor and an electric power source, the improvement comprising: a normally open switch providing a path to ground when closed, and means coupled to said circuitry to ground the induction coil by a continuous voltage when the switch is closed, said normally open switch being a hand-operable switch, said means coupled to said ignition circuitry including switch means that close when said normally open switch is closed, and said means coupled being energized by the ignition circuitry, whereby the induction coil is grounded by a continuous voltage, said switch means being connected to said source after closing when the ignition switch is opened after the coil is grounded to continue the grounding of the induction coil, said switch means being first and second relay operated switches, said first relay operated switch being directly connected to the source when closed and said second relay operated switch being directly connected to the coil when closed.

Claim 8

In an ignition system for spark-fired internal combustion engines, engine shutoff apparatus including ignition circuitry having an ignition switch, an induction coil having a primary and a secondary circuit, a timer having a switch and capacitor, a distributor and an electric power source, the improvement comprising: a normally open switch providing a path to ground when closed, and means coupled to said circuitry to ground the induction coil by a continuous voltage when the switch is closed, said normally open switch being a hand-operable switch, said means coupled to said ignition circuitry including switch means that close when said normally open switch is closed, and said means coupled being energized by the ignition circuitry, whereby the induction coil is grounded by a continuous voltage, said switch means being connected to said source after closing when the ignition switch is opened after the coil is grounded to continue the grounding of the induction coil, said switch means being first and second relay operated switches, said first relay operated switch being directly connected to the source when closed and said second relay operated switch being directly connected to the coil when closed.

Claim 9

In an ignition system for spark-fired internal combustion engines, engine shutoff apparatus including ignition circuitry having an ignition switch, an induction coil having a primary and a secondary circuit, and an electric power source, the improvement comprising: a normally open switch providing a path to ground when closed, means coupled to said circuitry being adapted to ground the ignition circuitry when the normally open switch is closed, said means coupled including a time delayed switch that closes at a predetermined time after said normally open switch closes to connect said means coupled with said ignition system so that an engine will not start while said normally open switch is closed, and delay means within said means coupled to delay the closing of said time delayed switch said predetermined amount of time after the normally open switch is closed.

Claim 10

In an ignition system for spark-fired internal combustion engines, engine shutoff apparatus including ignition circuitry having an ignition switch, an induction coil having a primary and a secondary circuit, and an electric power source, the improvement comprising: a normally open switch providing a path to ground when closed, means coupled to said circuitry being adapted to ground the ignition circuitry when the normally open switch is closed, said means coupled including a time delayed switch that closes at a predetermined time after said normally open switch closes to connect said means coupled with said ignition system so that an engine will not start while said normally open switch is closed, and delay means within said means coupled to delay the closing of said time delayed switch said predetermined amount of time after the normally open switch is closed.

Claim 11

A circuit for shunting an induction coil in an ignition system, said circuit comprising: a normally open switch for providing a path to ground when closed and for energizing the circuit and for causing the coil to be shunted when closed, a delay portion of the circuit having first means to delay voltage buildup a predetermined amount and having second means, in which voltage is built up, in series with said first means, a biased and stabilizing portion of the circuit in parallel with said delay portion and having third means connected to said delay portion to be operated after said delay, a gated switch being in series with said normally open switch when closed, said third means being adapted to provide reduced voltage to fire said gated switch when said normally open switch is closed and after said delay, and means in series with said gated switch and being adapted to close a first switch to close the circuit to shunt said coil.

Claim 12

A circuit for shunting an induction coil in an ignition system, said circuit comprising: a normally open switch for providing a path to ground when closed and for energizing the circuit and for causing the coil to be shunted when closed, a delay portion of the circuit having first means to delay voltage buildup a predetermined amount and having second means, in which voltage is built up, in series with said first means, a biased and stabilizing portion of the circuit in parallel with said delay portion and having third means connected to said delay portion to be operated after said delay, a gated switch being in series with said normally open switch when closed, said third means being adapted to provide reduced voltage to fire said gated switch when said normally open switch is closed and after said delay, and means in series with said gated switch and being adapted to close a first switch to close the circuit to shunt said coil.

Claim 13

The invention according to claim 7 in which: said first means is a resistor.

Claim 14

The invention according to claim 7 in which: said second means is a capacitor.

Claim 15

The invention according to claim 7 in which: said third means is a unijunction transistor.

Claim 16

The invention according to claim 7 in which: said gated switch is a rectifier having a gate.

Claim 17

The invention according to claim 7 in which: said gated switch is an SCR having a gate.

Claim 18

The invention according to claim 7 in which: said means in series with said gated switch is a relay adapted to close a relay-operated said first switch.

Claim 19

The invention according to claim 13 including: a second switch operated by said means in series with said gated switch, and being in parallel with said first switch, said second switch being directly connected to the ignition system power source so as to be adapted to continue to shunt the coil after being closed when the ignition switch is open.

Claim 20

The invention according to claim 7, including: a second normally open switch for providing a path to ground when closed and for causing the coil to be shunted when closed independently of the first normally open switch.

Claim 23

In an ignition system for spark-fired internal combustion engines, engine shutoff apparatus including ignition circuitry having an ignition switch, an induction coil having a primary and a secondary circuit, and an electric power source, the improvement comprising: a normally open switch providing a path to ground when closed, and means coupled to said circuitry to shunt the primary circuit to cause overtension to occur across the primary circuit of the coil when the normally open switch is closed, said means coupled including a time delay means which functions at a predetermined time after said normally open switch is closed to interlock said means coupled with said ignition system so that an engine will not start while said normally open switch is closed, said means coupled being comprised of elements coupled and arranged so that failure of function of any or all of them being adapted to permit continued normal operation of the ignition system.

Claim 24

In an ignition system for spark-fired internal combustion engines, engine shutoff apparatus including ignition circuitry having an ignition switch, an induction coil having a primary and a secondary circuit, and an electric power source, the improvement comprising: a normally open switch providing a path to ground when closed, and means coupled to said circuitry to shunt the primary circuit to cause overtension to occur across the primary circuit of the coil when the normally open switch is closed, said means coupled including a time delay means which functions at a predetermined time after said normally open switch is closed to interlock said means coupled with said ignition system so that an engine will not start while said normally open switch is closed, said means coupled being comprised of elements coupled and arranged so that failure of function of any or all of them being adapted to permit continued normal operation of the ignition system.

Claim 25

In an ignition system for spark-fired internal combustion engines, engine shutoff apparatus including ignition circuitry having an ignition switch, an induction coil having a primary and a secondary circuit, and an electric power source, the improvement comprising: a normally open switch providing a path to ground when closed, means coupled to said circuitry being adapted to shunt the primary circuit when the normally open switch is closed, said means coupled including a first time delay switch which closes at a predetermined time after said normally open switch closes to interlock said means coupled with said ignition system so that an engine will not start while said normally open switch is closed, and delay means within said means coupled to delay the closing of said first time delayed switch said predetermined amount of time after the normally open switch is closed.

Claim 26

In an ignition system for spark-fired internal combustion engines, engine shutoff apparatus including ignition circuitry having an ignition switch, an induction coil having a primary and a secondary circuit, and an electric power source, the improvement comprising: a normally open switch providing a path to ground when closed, means coupled to said circuitry being adapted to shunt the primary circuit when the normally open switch is closed, said means coupled including a first time delay switch which closes at a predetermined time after said normally open switch closes to interlock said means coupled with said ignition system so that an engine will not start while said normally open switch is closed, and delay means within said means coupled to delay the closing of said first time delayed switch said predetermined amount of time after the normally open switch is closed.

Claim 27

The invention according to claim 18 in which: said means coupled includes means to supply power from the source to the primary circuit of the coil.

Claim 28

The invention according to claim 18 in which: said normally open switch is a heat sensing switch adapted to be closed by overheating of the engine at a predetermined temperature.

Claim 29

The invention according to claim 18 in which: said normally open switch is a hand-operable antitheft switch.

Claim 30

The invention according to claim 18 including: a second normally open switch coupled to said means coupled, said second switch when closed being connected to shunt said primary circuit independently of said first normally open switch.

Claim 31

The invention according to claim 18 in which: said means coupled to said ignition circuitry includes said first time delayed switch and a second time delayed switch that close when said normally open switch is closed and said means coupled is energized by the ignition circuitry, whereby the primary circuit is shunted by a continuous voltage, said first and second time delayed switches being connected to said source after closing when the ignition switch is opened after the primary circuit is shunted to continue the shunting of the primary circuit.

Claim 32

The invention according to claim 23 in which: said first and second time delayed switches are first and second relay operated switches, said first relay operated switch being directly connected to the source when closed and said second relay operated switch being directly connected to the primary circuit when closed.

Claim 33

The invention according to claim 18 in which said means coupled includes: said delay means being a predetermined time delay circuit portion adapted to delay voltage buildup therein, a biased stabilizing and temperature compensating circuit portion coupled to be energized by said delay circuit and having means adapted to reduce the voltage to a gated switch connected thereto, said gated switch being fired by the reduced voltage to connect the closed normally open switch to said first time delayed switch, said first time delayed switch being energized by source voltage through said closed gated switch being adapted to apply negative source voltage from said means coupled to the primary circuit.

Claim 34

The invention according to claim 25 in which: said time delay portion is comprised of a high value time delay resistor and a capacitor in series, said biased portion being in parallel with said delay circuit portion and having a stabilizing resistor, a unijunction transistor and voltage reducing resistor in series.

Claim 35

The invention according to claim 26 including: a diode for preventing current flow from said source to said means coupled.

Claim 36

The invention according to claim 27 including: signal means coupled to said ignition circuitry and actuated by the closing of said normally open switch.

Claim 37

The invention according to claim 22 in which said means coupled includes: said delay means being a predetermined time delay circuit portion adapted to delay voltage buildup therein, a biased stabilizing and temperature compensating circuit portion coupled to be energized by said delay circuit and having means adapted to reduce the voltage to a gate connected thereto, an SCR having said gate, the SCR being fired by the reduced voltage to connect a closed normally open switch to said first time delayed switch which is a first electromagnetic switch, said first electromatic switch when energized by negative source voltage through said SCR being adapted to apply negative source voltage from said coupled to said coil, said first electromatic switch being a relay, operating a first relay switch, said means coupled being connected to said primary circuit when said first switch is closed.

Claim 38

The invention according to claim 29 in which: said relay is adapted to operate a second relay switch, said second relay switch being coupled directly to said source when closed, whereby when said relay is energized said coil is continuously shunted while either of said normally open switches is closed and when said ignition switch is open or closed.

Claim 39

The invention according to claim 29 including: signal means coupled to said ignition circuitry and being actuated by the closing of one of said normally open switches.

Claim 40

The invention according to claim 31 including: means between said normally open switches to prevent the closing of the other normally open switch from actuating said signal means.