Stern drive

Marine propulsion – Screw propeller – With means effecting or facilitating movement of propulsion...

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Details

440 61, 440 75, B63H 2300

Patent

active

047753420

ABSTRACT:
A drive mechanism for a boat having the motor located inboard. The mechanism disclosed includes a gearbox located outboard of the transom with an input shaft extending toward the inboard motor and an output shaft extending aft toward a propeller shaft. A univerasl joint coupling is provided to drive the propeller shaft while a gimbal ring is employed to universally mount a propeller shaft housing such that the propeller may be used for steerage as well as forward thrust. The gearbox is disclosed as including a first gear pair capable of being changed to provide different output ratios. A second drive link in the gearbox gives a selection of directions of rotation of the propeller shaft. In a first instance, a gear pair is employed. In a second instance, a chain drive is employed. Access is provided into the gearbox by a plate located between the gearbox and the transom. This plate provides a mounting for the drive links within the gearbox. Another gearbox having a single gear pair is also disclosed for lowering the level of the propeller shaft relative to the boat hull.

REFERENCES:
patent: 317582 (1885-05-01), Schulze-Berge
patent: 2973738 (1961-03-01), Ladewig
patent: 3057320 (1960-08-01), Daniels
patent: 3136287 (1964-06-01), North
patent: 3304906 (1967-02-01), Nace
patent: 3376842 (1968-04-01), Wynne
patent: 3403655 (1968-10-01), Warburton
patent: 3430603 (1969-03-01), Parish
patent: 3626467 (1971-12-01), Maziotti
patent: 3628492 (1971-12-01), Baldwin
patent: 3933116 (1976-01-01), Adams et al.
patent: 3951096 (1976-04-01), Dunlap

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