Electricity: motive power systems – Three-or-more-positions motor controller systems – Return to 'off' – 'starting' or 'neutral' positions
Patent
1979-01-15
1980-10-07
Smith, Jr., David
Electricity: motive power systems
Three-or-more-positions motor controller systems
Return to 'off', 'starting' or 'neutral' positions
74850, 180271, 318139, 318490, B60L 300
Patent
active
042271320
ABSTRACT:
Disclosed herein is a thyristor interlock circuit for energizing a DC motor, the circuit comprising a solenoid switch including an actuating coil, the solenoid switch and the motor being connected in series relation between the opposed terminals of the DC source, a thyristor having an anode, a cathode, and a gate, an ignition switch which connects the anode to one terminal of the DC source, a start switch normally biased to an open position, the start switch being linked to close after closing of the ignition switch, the start switch being connected to the one terminal of the DC source and to the gate, a resistor for limiting the gate current, a controller having a switch with two terminals, and a sub-circuit comprising a first lead including a first resistor and connecting the first resistor and the actuating coil in series relation between the thyristor cathode and the other terminal of the DC source, a second lead connecting one terminal of the controller switch to the start switch and the gate, a third lead connecting the other terminal of the controller switch to the first lead between the first resistor and the actuating coil, a fourth lead including a second resistor and a diode connected in parallel relation, the fourth lead connecting the resistor between the gate and the thyristor cathode, and connecting the cathode of the diode to the gate and the anode of the diode to the thyristor cathode, the sub-circuit forcing an operator to close the ingition switch and the start switch in order to gate the thyristor and then to close the controller switch in order to energize the actuating coil and the DC motor. Also disclosed herein is an interlock circuit modified to include indicator lights and to force an indicator light check.
REFERENCES:
patent: 3649896 (1972-03-01), Mason et al.
patent: 3659113 (1972-04-01), Wagner
patent: 3726265 (1973-04-01), Howard
patent: 3827540 (1974-08-01), Bolinger
patent: 3964444 (1976-06-01), Hemmann et al.
patent: 4051915 (1977-10-01), Behrens
Cavil David T.
McAuliffe Gerald N.
Outboard Marine Corporation
Smith Jr. David
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