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US 6,142,735 AGranted
Variable-pitch propeller, especially for sport craft
OwnerPeter Mullerinventor
Life of this patent
Estimating the term…
Abstract
A variable-pitch propeller, especially for a sport board, has angularly displaceable blade support plates which can be rotated about respective radial axes. The plates are provided with radially inwardly directed claws which engage in circumferential grooves of bases of the blades. The latter can have radial projections reaching beneath the claws. The resulting bayonet connection simplifies mounting and dismounting of the propeller blades even under water.
Claims10
A propeller, especially for a sport boat, comprising:
- a hub;
- a plurality of blade-support plates angularly spaced apart on said hub;
- and
- respective blade members affixed to said blade-support plates, each of said blade members comprising a base connected to the respective blade-support plates and a blade extending outwardly from said base away from said hub, each of said blade-support plates having a first formation and each of said bases having a second formation mating with the respective first formation,
- one of the mating first and second formations comprising at least two claws extending inwardly and angularly spaced therearound, and
- the other of the mating first and second formations being provided with at least one groove adapted to receive said claws, clearances enabling said claws to be received in said groove, and, between said clearances, projections extending outwardly and engageable under said claws, mating formations respectively having two diametrically opposite claws and projections said one of said mating formations has a planar surface, said claws overhanging the planar surface, said other of said mating formations having a planar surface juxtaposed with the respective plate, said planar surface of said one of said projections has a spacing from said claws corresponding to a thickness of said projections, at least one of the claws of the mating formations having a stop engageable by a respective projection upon assembling a respective blade member on a respective plate.
3 more elements
A variable-pitch boat propeller, especially for a sport boat, comprising:
- a hub provided with a pitch-adjustment mechanism;
- a plurality of blade-support plates angularly spaced apart on said hub and rotatable about respective radial axes by said mechanism;
- and
- respective blade members affixed to said blade-support plates, each of said blade members comprising a base connected to the respective plate and a blade extending outwardly from said base away from said hub, each of said plates having a first formation and each of said bases having a second formation mating with the respective first formation,
- said first formations each comprising at least two claws extending inwardly relative to the respective radial axis and angularly spaced therearound, and
- the respective second formation being provided with at least one groove adapted to receive said claws, clearances enabling said claws to be received in said groove, and, between said clearances, projections extending outwardly relative to the respective radial axis and engageable under said claws.
3 more elements
Dependencies are inferred from the claim text.