US1686214A - Propeller - Google Patents

Description

Oct. 2, 1928. 1,686,214

' R. N. KYLE PROPELLER Filed March 8, 192.7

' INVENTOR fiayzm /V. KYLE ATTORNEYS.

Patented Oct. 2, 1928.

UNITED STATES ROYAL N. KYLE, OF GARDNERVILLE, NEVADA.

PROPELLEB.

Application filed March 8, 1927 Serial-No. 173,694.

The present invention relates to improvements in propellers and has particular ref.- erence to an airplane propeller, altho the principles embodied therein may be used in connection with other propellers. The prin cipal object of the present invention is to provide a propeller of open construction in which the active propeller blades are arranged at a distance from the hub and are supported relative thereto by means of arms or rods, which offer little resistance to the air passing therethrough. It is further proposed to arranged the arms relative to the hub in such a manner that the ends thereof 1 lie in a helical curve of which the axis of the hub forms the center line.

It is further proposed to provide a pro- 'peller of the character described that is very simple in construction and economical to manufacture.

Further objects and advantages of my propeller will appear as the specification proceeds.

The preferred form of my propeller is illustrated in the accompanying drawing, in which Figure 1 shows a front View of my propeller;

Figure 2 a top plan view;

Figure 3 a side view as seen from line 33 of Figure 1;

Figure 4 a sectional view taken along line 14 of Figure 1;

Figure 5 a sectional view taken along line 55 of Figure 1.

\Vhile I have shown only the preferred form of my invention, it should be understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit of the invention.

My propeller 1 includes a hub 2 which by means of a screw 13, or by other means, may be fastened to the end of a crank shaft driven by an engine, not shown in the drawing. From the hub which is preferably cylindrical in form and round at the front as I shown at 42, extend two sets of radial arms 1 6, the two sets being arranged in parallel transverse planes and arranged at an angle to one another so that the ends of the coordinate arms lie substantially in the curve of a helix at a distance from the axis of the hub. The two opposing arms are aligned and may be made in one piece extending through the hub, as illustrated in the drawmg. g

Blades 7'arefastened to the ends of each two coordinate arms at a distance from the hub, the blades being formed along the lines of a screw propeller so as to substantially lie in a helical plane. The blades may be' made hollow, as shown at 8, and formed with perforations 9 at the inner ends thereof through which the arms 6 may enter. The latter arms are sufiiciently resilient to be sprung into the perforations and preferably extend throughout the blades as illustrated in the drawing. The blades are" tapered toward the axis as shown at 11, the front and rear edges of each blade running sub-V stantia-lly in radial direction and parallel to the arms 6. It will be noted that when the blades are slipped over two arms they are locked in placed by their tapered form.

It will be noted that in a propeller of" this character little resistance is offered to" I ROYAL N, KYLE.

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