US2231827A

US2231827A - Propeller

Info

Publication number: US2231827A
Application number: US227861A
Authority: US
Inventors: Greene Abraham Edison
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-08-31
Filing date: 1938-08-31
Publication date: 1941-02-11
Anticipated expiration: 1958-02-11

Description

Feb.11,194 1. A. E. GREENE 2,231,827

Filed Aug a1, 1938 fibre/2am [411' n Greene.

l H ORA/E) Patented Feb. 11, 1941 L UNITED :STATES F'PATENT OFFICE Abraham Edison Greene, Carmanville,

Newfoundland Application August a1, 1938, Serial No. 227,861

2 Claims. (01. 17o 159) This present invention relates to certain new and useful improvements in a propeller.

The primary object of the invention resides in the provision of a propeller ofgenerally improved and simplified construction and increased "emciency.

The invention has for another'object the provision of a propeller of the character stated which is constructed so as to operate against the water and force the same 'rearwardly so as to obtain the highest efficiency of operation of the propeller and the maximum forward movement of the propeller and the boat operated thereby, with the minimum strain on the'propeller.

The invention has for a further object the provision of a propeller of the character stated by means of which a boat may be propelledat the maximum speed or stopped in the minimum period of time, with the maximum strain on the propeller at all times.

The invention has for a still further object the provision of a propeller of the character stated which is of simple and inexpensive construction as well as increased efficiency and may be readily manufactured at small cost and installed on the propeller shaft of boats of various types and may be retailed at a popular price with good profit, thus providing a commercially attractive proposition.

To the accomplishment of these and related objects as shall become apparent as the description proceeds, my invention resides in the construction, combination and arrangement of parts as shall be hereinafter more fully described, illustrated in the accompanying drawing, and pointed out in the claims hereunto appended.

The invention will be best understood and can be more clearly described when reference is had to the drawing, forming a part of this disclosure, wherein like characters throughout the several views.

In the drawing Figure 1 is a front elevation of the improved propeller; and

Figure 2 is a side elevation, at right angles to Figure 1.

Referring more in detail to the drawing, it is to be noted that the propeller includes a sleeve 6 of elongated form and having a longitudinal slot 1 therein, whereby the propeller sleeve 6 may be readily keyed to the propeller shaft of a boat or the like. A pair of forward reversely extended arcuate propeller blades 8 project radially from diametrically opposite portions of the propeller sleeve 6, near the forward end of the latter, said indicate like parts sleeve G'thus serving. as a hub.' The blades 8 on issuing from the sleeve 6' swing through about 180 in a free'wing, increasing in width from their inner attached ends to their outer ends with their free extremities 9 cut straight across and the corners in thereof rounded. The blades 8 are not curved transversely, having relatively fiat forward and rear faces, always'in aplane at right angles to the .axisof said sleeve but move rearwardly gradually from their inner fixed ends to their free outer ends 9, the two blades 8 describing an arc oppositely directed from the sleeve or hub s so as to follow one another during rotation of the propeller. A second, similar pair of propeller blades. II have their narrow inner ends extended from diametrically opposite points on the propeller sleeve or hub 6, near the rear end of the latter and at right angles to the points of connection of the first mentioned blades 8 with said sleeve or hub 6. This second pair of propeller blades I I also on issuing from the sleeve 6 swing through approximately 180 and increase in width from their attached inner ends to their free outer or rear ends I2 which are cut straight across with the corners I3 thereof rounded and likewise; this second pair of blades I I are gradually bent rearwardly from their fixed inner ends to their free outer ends I2, although the blades II are not curved transversely. The two blades II describe arcs similar to those described by the blades 8 with each blade I I extended oppositely from the other so that they will follow one another in the water, during operation of the propeller. By this construction and arrangement of the blades 8 and I I, which are of relatively thin material, on the sleeve or hub 6, each of the pairs of blades 8 and I I, together with the sleeve or hub 6 appear to describe the letter 5 when looking at one end of the propeller sleeve or hub 6 with the two Ss arranged at right angles with one in front of and overlapping the other; the individual blades 8 and I l of each of the pairs thus passing through an angle at the axis of more than As the construction of the device has thus been described in detail, brief reference is now had to its use and modus operandi: This propeller may be manufactured as a left-turn propeller or a right-turn propeller, as desired, In either case, rotation of the propeller with the propeller shaft on which it is mounted, will result in forcing the boat forwardly when the propeller is rotated in one direction and reversing the movement of the boat when the rotation of the propeller is reversed. Thus, when it is desired to stop forward movement of the boat, rotation of the propeller constructed within the scope of the appended claims, without departing from the spirit or scope thereof, it is intended that all matters contained in the said accompanying specification and drawing, shall be interpreted as illustrative and not in a limitative or restrictive sense.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A propeller including an elongated propeller sleeve adapted to be keyed on a propeller shaft; forward and'rear pairs of propeller blades arranged to extend respectively from said sleeve at right angles to one another and in overlapping relation; each of said blades being constructed of thin material with flat forward and rear. faces; each blade being increased in width from its inner end attached to the propeller sleeve adjacent one end of the latter, to, the outer wide and spaced free end of the blade; each pair of blades, together with the intermediate portion of the sleeve in end elevation substantially describing an 8; said blades being thrust rearwardly from their inner ends to their outer ends.

2. A- propeller including an elongated propeller sleeve adapted to be keyed on a propeller shaft; a pair of forward blades of substantially arcuate form extending radially from diametrically opposite portions of said sleeve adjacent the forward end thereof; the blades of said forward pair increasing in width as they extend outwardly from said sleeve, being oppositely turned and describing .each an arc of approximately 180 a corresponding pair of rear blades of like design extended radially from diametrically opposite portions of said sleeve adjacent the rear end thereof and from points at right angles to the points of attachment of said first mentioned pair of blades; each pair of said blades together with the intermediate portion of the sleeve in end elevation substantially describing an S and said blades individually passing through an angle of more than 90 at the axis overlap so that in end elevation a continuous unbroken propeller surface or area is provided, said blades being constructed of thin material and having flat forward and rear faces always in a plane at right angles to the axis of said sleeve.

' ABRAHAM EDISON GREENE.