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Composite modular self actuating variable pitch marine propeller

a self-actuating, marine technology, applied in the direction of marine propulsion, rotors, vessel construction, etc., can solve the problems of difficult adjustment or keeping adjustment, high cost, and inability to have the best of both worlds for any given situation, etc., to achieve simple, durable and cost-effective

Inactive Publication Date: 2013-11-07
UNIPROP MARINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a new design for a propeller assembly that allows for easy replacement of blades without needing to replace the entire assembly. The design also includes side exit ports and a funnel venturi over hub exhaust exit system, which improves top speed. The blades are secured within the hub sections using interlocking shoulder pocket areas, and the blades themselves contain a transverse section for rotational stop positioning and a cam profile for pitch change control. The blades are also allowed to move outward and rotate on their shafts, and a threaded upper end cap is used to provide a limit to the vertical travel of the upper hub housing and control the amount of spring tension between the blade cam area and the upper hub flat bottom surface. Overall, this invention provides improved performance and efficiency for propeller assemblies.

Problems solved by technology

The problem has always been that you cannot have the best of both worlds for any given situation.
They are in use today, but are exclusive in price such that the average pleasure boater cannot afford one.
These were hard to adjust or keep adjusted and expensive for the day again.

Method used

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  • Composite modular self actuating variable pitch marine propeller
  • Composite modular self actuating variable pitch marine propeller
  • Composite modular self actuating variable pitch marine propeller

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Embodiment Construction

[0032]Now referring to the drawings, FIGS. 1-14, they show the propeller assembly of the present invention, which typically has bottom, middle and top hub sections that are coupled together, along with a top cap, a compression spring and four blades. The diameter of the entire propeller is typically 16 inches and is intended for engines with horsepower up to 300 horsepower and all parts with the exception of the spring, nuts and splined insert are made of a plastic known as VERTON, containing 30 percent long fiber filler.

[0033]With reference to FIG. 1, and by way of a brief overview, the propeller assembly includes a bottom hub section A, 4 unitary blade and root portions B, a middle hub section C, a top hub section D, a compression spring E and a top end cap F.

[0034]By way of assembly and in reference to FIG. 1, the four blades B, which are shown in FIG. 3, are represented by a main blade area, a blade shaft 2, large blade shaft end 3, a flat section of a transverse protrusion 4, a...

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Abstract

This invention provides a composite modular self-actuating, variable pitch propeller with a cylindrical hub housing assembly, a plurality of blades that automatically adjust between an initial, fixed low pitch setting and multiple higher pitch settings that occur in response to centrifugal force, water pressure, spring tension and height adjustment of the upper section of the device and cam profile of the inner section of the blades and adjacent cam ramp on the hub. Also provided is an over hub exhaust design that allows engine exhaust to exit thru ports in the exterior wall of the hub section. Additionally, a threaded cap and spring in the top section provides a means of adjustment to limit the maximum high pitch. Finally, each blade includes a protruding cam profile perpendicular to the blade shaft axis, with a flat surface acting as a low pitch stop and a profile that extends upward.

Description

[0001]This invention relates to automatic, variable pitch plastic propellers wherein the blade pitch automatically adjusts between a wide range of pitch positions.BACKGROUND OF THE INVENTION[0002]Unlike automobiles that have multiple gears allowing for a smooth transition between stopped and high speed and providing a means of reducing the stresses induced in the drive train upon acceleration. boats are limited to a one speed gear case. The only available variable allowing for reduced stresses and better top speed or acceleration is the pitch of the propeller. For a pleasure boat requiring best top speed, one would need to use a high pitch propeller of say a 23 pitch. If one was in need of pulling heavy loads, then a low pitch propeller is needed of say a 17 pitch. The problem has always been that you cannot have the best of both worlds for any given situation.[0003]There have been a variety of modern day improvements on the requirement of a single pitch on a propeller. Several devi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01D7/00
CPCB63B2231/52B63H3/008B63H3/00
Inventor FULMER, GARY B.
Owner UNIPROP MARINE
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