US997587A - Propeller. - Google Patents

Description

c. A. SWENSON. a PROPELLER.

AP nnnnnnnnnnnnnnn P117! 1999. I

' Patented July 11,1911:

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'Tfll GTTO E. KUEHL, F MEDFURID, MASSACHUSETTS.

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To all whom it may concern:

Be it known that I, Gnannns A. Swanson, citizen of the United States, residing at Medford, in the county of lifedford and State of Massachusetts, have invented cer tain new and useful improvements in Pro pellers, of which the following is a specification.

My invent-ion relates to propeller blades that are used for the propulsion :of vessels through air, water or other fluid, or for the iinpulsion of air or other fluid, as infans and centrifugal pumps, or for the generation of power.

The object of my invention is to provide a fluid propeller or like structure of a more effective form than those zit-present: in use, and particularly to so construct the propeller blades that the lateral slip of fluid toward the tips of the blades shall'be prevented, so that the air, water or other fluid will be forced directly rearward from the propeller blade, this novelconstruction further permitting the propeller blades to be pitched rearward or placed at less than a right angle to the shaft upon which the blades are mounted. '1;.. i

My invention is applieable to'the pi opifi sion of boats, air ships, or for use with fans,

pumps, or water wheels.

For a full understanding of theinvent on and the merits thereof, and to acqulre a knowledge of the details of construction, ref:

erence is to be had to the following description and accompanying drawing, in which: Figure l a face view of my improved propeller; Fig. 2 is a perspective view thereof; and, Fig, 3 is a view showing the edge of one of the blades, the other blade being cut away. I

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawing by the same reference characters. v

Referring to these figures, 2 designates the opposed blades of atwo-bladed propeller or like structure. These blades in the illustration shown, are formed with shanks 3 which are semicylindricai-in section and are adapted to be clamped upon a propeller shaft designated by the numeral 4. These (.opposed sections or shanks 3 are clamped aspen the shaft in. anydesired manner, but I .have shown there as being forined with mar- ,iggtinel flanges 5 through .VlllCll, PBfSS bolts 6.

.peller blades,

Specification of Letters 2mm. Patented-July 11, 1-911. hpplieation filcd September 17, mos. Serial nolsiaas's'.

form pr n eachblade being set at a differ. ent angle to the opposed blade. 1

The blades 2 have the usual The novel feature of my invention consists in forming each blade with a series. of ribs? which extend transversely across the face of the blade, preferably from one edge tothe;

other. While I do not wish to limit myself to this, these blades are preferably curved approximately concentric to the shaft 4 so as to reduce, as far as possible, friction as they pass through the water or other fiuid.

The curvature of the ribs 7 is only approximately concentric to the shaft 4. Preferably the blades are sections of a spiral, the cen ter of the spiral being the shaft 4. Each projection or rib therefore acts as a propeller in itself, by catching the Water and throwing it directly astern.

As before stated, the ribs 7 are only approximately concentric to the shaft. Preferably, the ribs extend across the face of the blade, from one edge to the other thdreof, at an angle to the longitudinal axis of the blade, so that the rearward or leaving end of each rib will be nearer to the tip or extremity of the blade than the I forward orf entering end of the rib. This particular inclination of the rib to the axis of the blade, combined with the angle which the rib has to the face of the blade, gives to each rib the effect of a small propeller'in itself, and the blade has not only the general action of the screw,, but each of the ribs thereon has a screw "action which tends to force the water rearward off the edge of the rib. This is a most important feature of my invention,

and acts to give my propeller a much greater power "than is possible with. propellers having smooth acting faces.

\ The screw propeller as now used',rev lves at right; angles to the shaft. A pro ell r or like bladed wheel having the ribs 7 thereon, may be pitched rearward and be used to better advantage than a propeller in which the blades are at right angles to the shaft,

fluid from being thrown toward the tips 'of as the ribs' prevent the water, air or other the blades by centrifugal motion. It will be obvious that with a smooth-bladed propeller, the fluid will 'ha'veia tendency to Slip laters ally, and that the whole force of the screw will not be delivered in lines parallel to the axis of the shaft upon which the propeller lLlllTlSA This is for the reason that the fluid 'has a tendency not only to be projected rearward, but to be forced laterally or outward toward the tips of the blades. The ribs 7 or other projections on the face of my propell er, p1"event this lateral movement of the water so that the propeller has a better grip upon the water or other fluid. There is no slipping of the water laterally or in the direction of the longer axes of the blades, and all of the force of the propeller is delivered in line with the shaft.

lVhile I do not wish to be limited to the exact form of the projections or ribs 7, I preferably form them as above described, and the ribs should be as sharp-edged as possible, and as thin as is consistent with strength, in order to eliminate friction.

Blades constructed .in accordance with my invention are designed fog; use on any device using the screw propeller principle, such as aero-nautical vessels, wind mills, marine propellers, electric fans, blowers,'turbines,

etc, and therefore, it will be obvious thatl do not wish to be limited to the exact form.

of the propeller shown in the illustration,

nor to the details of construction, the nune ber of blades, etc.

Having thus des'eribed the inrentiongrhat I claim is:

A propeller ot' the hind described. coin prising a shaft and propeller blades thereon, the face of the blades being slightly eoncaved and said blades being inclined rearward and outward relative of the shaft, each of said blades having on its face a series of outwardly projecting, curved ribs, said ribs extending outward at an angle to the face of the blade but parallel to the axis of the shaft and said ribs extending at an inclination to the longitudinal axis of the blade, the exit end of each rib being nearer to the outer extremity of the blade than the entering end thereof.

In testimony whereof I attix my signature in presence of two witnesses.

CHARLES ALFRED SWENSON.

Witnesses:

OTTO E. KUEnL, ABRAHAM FINE.

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