Marine propulsion – Screw propeller – With means effecting or facilitating movement of propulsion...
Patent
1979-11-13
1982-01-12
Blix, Trygve M.
Marine propulsion
Screw propeller
With means effecting or facilitating movement of propulsion...
440 79, B63H 508
Patent
active
043103200
ABSTRACT:
An electrical control system for a pair of stern drives (or outboard motors) mounted side-by-side on a boat transom and mechanically linked to tilt them within a trim range to improve operational performance or to tilt them above the trim range to facilitate shallow water navigation, launching or trailing, comprises: a key-operated main switch; three manually operable toggle type (off, up, down) selector switches, namely, a trailer switch, a starboard trim switch, and a port trim switch; and other circuit components. With the main switch off (as when launching or trailing), trailer switch "up" or "down" effects corresponding tilt of both drives simultaneously to a desired position regardless of their initial position and the trim switches are ineffective. With the main switch on (as during boat operation), trailer switch "down" effects down tilt of both drives simultaneously to a desired position regardless of initial position, whereas trailer switch "up" effects up tilt of both drives only if both drives are already above the trim range. If both drives are above the trim range, operation of either trim switch "down" moves both drives simultaneously down, until the trim range is reached; but operation of either trim switch "up" has no effect. If both drives are within the trim range, either trim switch "up" or "down" effects corresponding tilt of the respective drive, but only within the trim range.
REFERENCES:
patent: 2999476 (1961-09-01), Johnson
patent: 3434449 (1969-03-01), North
patent: 3641965 (1970-10-01), Schmiedel
patent: 3756186 (1973-09-01), Nordling
patent: 3881433 (1975-05-01), Hamp
patent: 3957011 (1976-05-01), Hurst
patent: 3999502 (1976-12-01), Mayer
patent: 4052952 (1977-10-01), Hale
Blix Trygve M.
Paul John C.
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