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US 5,183,384 AGranted
Foldable propeller assembly
OwnerJoe H. Trumblyinventor
Life of this patent
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Abstract
A marine propeller assembly which folds completely parallel to a drive shaft axis when the boat motor is disengaged is disclosed. When the boat motor is disengaged the propeller blades fold rearward due to the force caused by the moving water under the boat. When the boat motor is engaged and the drive shaft beings to rotate, the centrifugal force causes the propeller blades to extend out 90 degrees to the drive shaft.
Claims2
A folding propeller assembly suitable for attachment to a shaft for use in marine propulsion, comprising:
- a propeller hub, said hub having a central axis of rotation and three slots each having opposing sides, said slots positioned such that the planes defined by the said slots intersect at equal angles;
- three propeller blades, said blades comprising a propeller stem connected to a working face
- a means of attaching said blades to said slots, wherein said last mentioned means further comprises a bolt positioned through said opposing sides of each of said slots,
- wherein said blades lie, when said hub is not rotating, in a plane substantially parallel to the said central axis of rotation, and such that when said hub is rotated about said axis, the centrifugal force caused by said rotation causes said propeller blades to extend to an angle that is effective so as to cause said blades to provide propulsion.
1 more element
Dependencies are inferred from the claim text.