US1540108A - Aeroplane propeller - Google Patents

Description

June 2, V1925.

l. c. DEGN AEROPLANE PROPELLER Filed May 20, 1924 Patented June 2, 1925.

PATENT O FICE.

IRWIN CHARLES DEGEN, or cHAsKA, MINNESOTA.

AEROPLANE PROPELLER.

Application led May 20, 1924. Serial No. 714,557.

To all whom t may concern:

Be it known that I, IRWIN CHARLES DnGnN, a citizen of the United States, residing at Chaska, in the county of Carver and State of Minnesota, have invented a new and useful Aeroplane Propeller, of which the following is a specification.

My invention relates to improvements in 'propellers for aircraft.

An object of the invention is to provide a propeller designed and equipped with means for reducing edgewise resistance, whereby the propeller may function with maximum eiciency.

lVith the foregoing and other objects in view, which will appear in the following description, the invention resides in the novel combination and arrangement of parts and in the details of construction hereinafter described and claimed.

In the drawings, Fig. 1 is a side elevational view of an embodiment of my invention, parts thereof being broken away to disclose structural arrangement otherwise concealed; Fig. 2 is a front elevational view illustrating, particularly, the blade and its relation with a power unit; Fig. 3 is a detail sectional view taken as on the line 3 3 of F ig. 2 and Fig. 4 is a similar view taken as on the line ll--il of Fig. 3.

Referring to the drawings, it Will be seen that my improved device includes propeller blades 10 resembling in outward appearance such blades as are ordinarily used on. aeroplanes and other aircraft. A special hub A is provided in the present instance, the same being hollow and comprising a forward restricted stud 11 and a rear, enlarged drum-like portion 12 having spaced annular flanges 13, 14 thereon. The inner surfaces of these flanges 13, 14: are beveled (Fig. 1), the latter supplying a connecting medium for the attachment of the hub A to a flange 15 of a motor crank shaft 16. Fitted about the portion 12 of the hub A. andfbetween the beveled sides of the flanges 13, 14 is a diametrically divided annulus 17 capable of being taken up when worn, said annulus being formed with an internal annular channel 17 therein. This channel 17 is in constant communication with the in` terior of the hub A through radial openings 12u therein. A suction pump B of conventional pattern is preferably driven as by means of a belt 18 overreaching a pulley 19 on the pump shaft 20 and a pulley 21 on the crank shaft 16 or other power driven shaft. Pipe connections 22 bring the pump B into communication with the channel 17 in the annulus 17. Said pipe connections 22 also serve to hold the annulus 17 against turning, but it is evident that other means may be conveniently employed for this purpose.

Reaching longitudinally of each blade 10 and through that portion thereof having thickest stock is a pipe or conduit 23.y A plurality of lateral passageways 24 in each blade communicate with the conduit 23 therein, said passageways opening at the advanclng'edge of the blade. With the suction pump B in operation and drawing air from the front of the advancing edges of the blades 10 through the passageways 24, conduits 23, hub A and pipe connections 22, it w1ll be understood that the frictional resistance of the air against said advancing edges will be minimized due to the rarefication of said air along those lines. Attending this result, the propeller operateswith greater eifciency than would otherwise be the case.

C-hanges in the specific form of my invention, as herein disclosed, may be made within the scope of what is claimed without departing from the spirit of my invention.

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

1. In a. device of the class described, a hollow hub for attachment to the propeller shaft of a motor, propeller blades mounted radially on said hub, each blade having a longitudinal duct therein communicating with said hollow hub and also having lateral passageways opening from the advancing edge of the blade into said duct, and air exhausting means communicating with said hollow hub.

2. In a device of the class described, radially related blades, each blade having a longitudinal duct therein and lateral passageways leading from the advancing edge of the blade to said duct, and means for exhausting the air from said ducts and passageways.

3. In a device of the class described, a hollow hub designed for attachment to the propeller shaft of a motor, propeller blades mounted radially on the forward end of the hub, each blade having a conduit extending longitudinally thereof and also passageways opening at the advancing edge of the blade and leading to said conduit, the conduit communicating with said hollow hub, said hub having radial openingsat the rear end thereof, an annulus encircling said end of said hub and formed with an internal annular channel communicating with said having radial openings therein and spaced annular flanges at, either side of said openings, said langes being beveled at their inner sides, propeller blades mounted radially on said stud, each blade having a conduit extending longitudinally thereof andaalso passagewa s openin at the advancing edge of the bla e and lea ing to said conduit the conduit communicating with the hollow stud, an annulus divided diametrically for the taking up of wear and fitted over the drum-like portion of said hub and between said anges, said annulus having an internal annular channel therein communicating with the radial openings in said hub and a suction pump communicating wit said channel. Y

In testimony whereof, I have signed my name to this specification.

IRWIN CHARLES DEGEN. l

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