Variable propeller for boat

Marine propulsion – Screw propeller – Variable pitch

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440 49, 416 89, B63H 300

Patent

active

054661773

ABSTRACT:
A sleeve 18 spline-fitted in an outer periphery of a propeller shaft 4 is connected to a propeller boss 12 for surrounding the outer periphery of the sleeve by a damper rubber 20 interposed in superposed relation therebetween, and in a recess formed in the outer periphery of the propeller boss 12 so that a bottom surface thereof comes near the outer periphery of the damper rubber 20, propeller blades are rotatably supported on a blade shaft 33 parallel to the propeller shaft 4. With this arrangement, it is possible to provide a compact variable propeller for a boat which can be mounted on a relatively short propeller shaft and which is provided with a torque limiting device.

REFERENCES:
patent: D141235 (1945-05-01), Birsch
patent: 3565544 (1971-02-01), Marshall
patent: 4801243 (1989-01-01), Norton

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