US1775568A

US1775568A - Propeller

Info

Publication number: US1775568A
Application number: US406034A
Authority: US
Inventors: Piesik Stefan
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-11-09
Filing date: 1929-11-09
Publication date: 1930-09-09
Anticipated expiration: 1947-09-09

Description

S. PIES! K Sept. 9, 1930.

PROPELLER Filed Nov. 9, 1929 Sig/d7? H26 17? @zaz (NVENTOR ATTORNEY Patented Sept. 9, 1930 UNHTED STATES PATENT. OFFICE STEFAN PIESIK, or MOUNT uNIoN, PENNSYLVANIA PnoPE Lnn Application filed November 9, 1929; Serial No. 406,034. 1

My present invention has reference to an improved construction in propellers for use on either air or water crafts, and my primary 7 object is the provision of a propeller which, while simply constructed, shall be light, strong and endurable and which shall embody a maximum amount of pulling force without straining the engine.

A further object is to produce a propeller.

It is a still further object to construct a propeller which is preferably of metal and which has parallel blades extending in opposite directions from the hub thereof, each of said blades being rounded outwardly and from thence inwardly from. the concaved central portions of the propeller, each blade, from its said outer end being divided into a plurality of blade sections or fiukes, which are arranged angularly with respect to each other, diamond-shaped in cross section, their inner edges disposed approximately centrally with respect to the outer edges of the respective flukes, and whereby each fluke will exert its full force for the entire Width there- 'of against the air or water with whichit con-- the different blades as they appear in Figure 2 of the drawings. 7 My improved propeller is preferably constructed of metal which is light but strong and wherein an additional strength is afforded the flukes or blades thereof by constructing the same substantially diamondshaped in cross section.

The improvement, from the hub portion 1 thereof, is formed with oppositely extending blades 2-.2, respectively. The blades, at their juncture with the hub 1 have their outer edges concaved or rounded inwardly to the central ring members 3 that surround the hub.

From thence the edges of the blades 2 are rounded or curved outwardly with respect to 1 each other and from thence the said blades are curved inwardly or toward each other.

Fromtheir. outer edges the blades 2 are cast or shaped to provide the same with any desired. number of flukes. The diametrically opposed outer flukes are indicated for distinction by the numeral 4: and while all the flulres are of the same width the longitudinal length of the outer flukes 4 exceed that of the inner fiukes 5, while the space between the inner flukes and the next outer flukes 6 is less than the space or division between the flukes 4L and5. As disclosed by the drawings each of the

flukes

4, 5 and 6 is diamond-shaped in cross section, that is, the same from the widened center thereof merge into sharpened edges. This is one of the important features of the invention as by such construction the flukes will cut through the wind or water with greater efficiency than were the flukes otherwise shaped. The fiukes, from their connection withthe hub 1 are gradually spread away from each other and are oppositely curved as disclosed byFigure 2 of the drawings. The space between the flukes, however, is such that one edge of the fluke 5 overlies the adjacent edge of the fluke 4 and likewise underlies the inner or adjacent edge of the fluke 6.

The fluid or air stream lines that are forced between the several flukes, during the r0ta tion of the propeller are attacked gradually and in a successive manner by all of the flukes and such contact will avoid the eddies of dead water or dead air produced by the turning of an orinary propeller. In addition to this each fluke will exert its full force of contact upon the fluid stream, with the result that the vessel to which the propeller is attached will be caused to move in a forward direction in an easier, steadier and quicker manner than can be accomplished by the ordinary propeller constructions.

Having described the invention, I claim A propeller for the purpose set forth, comprising a hub, a pair of oppositely extending blades fixed on the hub, having their outer edges concaved at their connection with the hub, from thence rounded outwardly from each other and inwardly or toward each other to their ends, said blades, from the outer ends being divided into central and end flakes, the division wall of two of the diametrically opposite end fiukes and the centralflukes being greater than the division wall between the second diametrically opposite end flakes and the inner flukes, and the space between the fiukes being gradually increased from the inner to their outer ends, said fiukes being diainond-sl'laped in cross section and being gradually spaced away from each other from their inner to their outer ends and disposed angularly and at opposite curvatures with respect to each other and the edges of the inner fiukes being disposed adjacent to but spaced from the inner edges of the outer flukes.

In testimony whereof I afiiX my signature.

STEFAN PIESIK.