Internal-combustion engines – Igniters – Incandescent
Patent
1978-09-21
1980-12-02
Cox, Ronald B.
Internal-combustion engines
Igniters
Incandescent
123148S, 123198DC, 56 105, F02P 100
Patent
active
042364949
ABSTRACT:
Disclosed herein is a lawn mower comprising a grass bag and chute, and a grass discharge cover, and an internal combustion engine having operation regulated by an electronically controlled C.D. ignition and interlocking shut-off system. The system includes a charge capacitor, an ignition coil including a primary winding having a first terminal connected to the charge capacitor and having a second terminal, the ignition coil including a secondary winding which fires a spark plug to operate the engine when the charge capacitor discharges through the primary winding. The system also includes a thyristor having an anode connected to the second terminal of the primary winding, and having a cathode and a gate, the thyristor being rendered conductive when a trigger pulse is applied to the gate to allow discharge of the capacitor through the primary winding, and a trigger coil having a first end connected to the thyristor cathode and a second end, and being adapted for generating trigger pulses applied to the thyristor gate. The system also includes a plurality of interlocking switches normally closed during engine operation and connected in series relation between the trigger coil second end and the thyristor gate, each of the switch means being selectively movable to an open position to interrupt current flow and prevent application of a trigger pulse from the trigger coil to the gate. At least one of the switches moves to an open position to prevent engine operation when one of the grass bag and chute, or the grass discharge cover, is not installed in a proper position on the lawn mower.
REFERENCES:
patent: 3524438 (1970-08-01), Janisch
patent: 3703889 (1972-11-01), Bopig
patent: 3750378 (1973-08-01), Thorud
patent: 3900016 (1975-08-01), Haubner
patent: 3960128 (1976-06-01), Anderson
patent: 3980068 (1976-09-01), Karsten
patent: 4073279 (1978-02-01), Fox
Cox Ronald B.
Outboard Marine Corporation
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