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US 4,058,360 AGranted
Self-feathering propeller
OwnerCarl R. Hirschbergerinventor
Life of this patent
Estimating the term…
Abstract
A self-feathering propeller for use on sail boats having an auxiliary power source. The propeller blades are rotated automatically to working pitch positions to provide an ahead or an astern thrust in accordance with the direction of rotation of the propeller shaft. When the shaft is stationary and water flow is substantially parallel to the shaft axis, as when the boat is under sail, the blades are automatically feathered thereby to minimize resistance to movement of the boat.
Claims7
A self-feathering propeller comprising,
- a. a tubular sleeve member having a pair of slots formed in one end thereof,
- b. a pair of blades,
- c. mounting means supporting the blades for free rotation about individual axes substantially normal to the axis of the sleeve member,
- d. an elongated hub adapted for attachment to a shaft, said hub supporting the said sleeve member for rotation about its axis and carrying radially-extending pintles which engage the side walls of said slots upon rotation of the hub relative to the sleeve member,
- e. first stop means carried by the sleeve member and limiting rotation of the blades about their axes in one direction, and
- f. second stop means carried by the hub and limiting rotation of the blades about their axes in the other direction.
3 more elements
Dependencies are inferred from the claim text.