US1425179A - Propeller - Google Patents

Description

A. DANIELSONA PROPELLER. APPLICATION FILED JUNE 1, 192i.

Patented Aug-'8, 1922.

INVENTOR Z'zwflma' ATTORNEY mon axis,

narrate I STATES reareiw oieeice.

ALBIN DANIELSON, BROOKLYN, NEW YORK, ASSIGNOR OF ONE-HALF TO HILMER JOHNSON. OF BROOKLYN, NEW YORK.

PROPELLER.

Application filed June 1, 1921.

T 0 all whom it may concern:

Be it known that T, ALBIN DANIELSON, a citizen of the United States of America, residing at Brooklyn, county of Kings, State of New York, have invented certain new and useful Improvements in Propellers, of which the following is a specification.

This invention relates to propellers for aeroplanes and the like. and the principal object is to provide a device of this nature wherein the angle of the blades may be changed at the will of the operator.

Another object is to providemeans whereby the blades may be moved to and held in a neutral position in which the blades will merely feather through the air in rotation, so that very little resistance is offered in starting whereby a light form of selfstarter may be installed for the engine.

Another object is to provide means whereby the blades may be rotated about a comsubstantially parallel with their respective longitudinal axes so as to bring the effective posterior surfaces of the blades into more or less direct thrust withthe air operated on so as to control the rate of flight.

Another object is to provide means for rotating the blades about said common axis in the reverse direction so as to render the anterior surfaces'of the blades effective. thus acting as a brake and reversing the effect of the propeller without reversing the direction of drive.

Another object is to provide common controlling means for effecting all of these movements of the blades. I

With these and other objects in view, which will be more apparent as the specification proceeds, the invention resides in certain novel construction and combination and relation of parts, the essential features of which are hereinafter fully described, are particularly pointed out in the appended claims, and are illustrated in the accompanying drawing, in which Figure 1 is aside elevation of "my improved propeller and attached mechanism. Figure 2 is a front View of the same.

Figure 3'is a transverse section taken substantially in line 3-3 of Figure 1.

Figure 4 is a sectional view taken sub- I stantially in line l-4 of Figure 3.

Like characters of reference refer to like parts in all views.

Referring to the accompanying drawing Specification of Letters Patent.

strengthening Patented Aug 8, 1922,

Serial No. 474,137.

in detail, 10 represents the propeller shaft which is in the form of a hollow tube and which may be rotated by any suitable train of mechanism from the motor or engine. Fixedly secured to or formed integrally with the propeller shaft 10 is a pair of diametrically arranged trunnions 11.

A rod 12 is mounted for sliding movement in shaft 10 and is provided with a pair of collars 13 and 14 fixedly secured to rod 12 and between these collars is confined a sleeve 15. Suitable bearings are provided at 16 between members 13 and ll and the member 15. The sleeve 15 is provided with diametrically oppositely disposed ears 17 which protrude through slots 18 in the propeller shaft 10. The slots 18 extend to the forward end of the shaft where a cap 19 threadedly engages the end of shaft 10, said cap being provided with a wrench socket 20.

The propeller blades are shown at 21 and are formed at their inner ends with cylindrical portions 22 seated-in hafts or tubes 23, The blades are properly stream lined as required. and near the hafts each has a conical protuberance 2% formed on it. The hafts 23 are disposed on opposite sides of the drive shafts 10 with their axes parallel with the axis of the trunnions 11 and at right angles to the axis of the drive shaft 10. Hafts 23 are pivotally mounted on trunnions 11 by means of cars 25 formed integrally with or secured rigidly to the hafts 23. Links 26 connect cars 27 of the hafts 23 with respective ones of the ears 1?.

It,will now be seenthat by moving the rod 12 forwardly, sleeve 15 will be moved forwardly and will draw with it links 26 which will cause the blades to move forward about the trunnions 11, whereby the posterior portions of the blades will be moved to meet the air at a greater angle or pitch whereby effecting driving of the aeroplane.

The blades are shown ,in' Figure 1 as in the neutral position in which condition they merely cut the air in revolving and do not effect any movement of the plane. This is the position of the blades in starting so that required.

It will also be seen that the slots 18 extend rearwardly a short distance from neutral position, so that by moving rod 12 rearwardly links 26 will be moved rearwardly to carry the blades beyond the neutral position and to such position that the anterior surfaces become effective and will act as a brake in slowing down the speed of the plane, and without changing the direction of drive of the propeller shaft. 7

Rod 12 passes rearwardly through the drive shaft 10 and near its rearvend is provided with a threaded portion 28 which engages in the interiorly threaded hub of a hand wheel 29. The hub of wheel 29 may be swiveled in any suitable stationary frame or bracket 80 through which the rear end of shaft 12 extends and by which it is prevented from turning by a key of said bracket extending into a keyway 31 in said rod An index finger 32 from said bracket overlays the wheel 29 upon which are suitably inscribed indices indicating Forward Neutral and Reverse.

By operation of the hand wheel 29 the rod 12 is moved back and forth as desired.

lVhile I have described what I deem to be the most desirable embodiment of my invention, it is obvious that many of the details may be varied without in any way departing from the spirit of my invention, and I therefore do not limit myself to the exact details of construction herein set forth nor to anything less than the whole of my invention limited only by the appended claims.

combination of a rotatable shaft, propeller.

blades hingedly mounted on said shaft, and a rod slidably mounted in said shaft and operable to effect movement of said blades on their hinges.

3. In a. device of the class described, the combination of a rotatable drive shaft, propeller blades hingedly secured to said shaft, and means for moving said blades on their hinges so as to render them selectively effective for driving and for braking, and

to render them ineffective at the will of the operator. 4. In a device of the class described, the combination of a rotatable drive shaft, propeller blades hingedly secured to said shaft, a rod slidably mounted in said shaft, and links operable by said rod for effecting movement of said blades on their hinges.

In testimony whereof, I aflix my signature to this specification in the presence of two subscribing witnesses this 17th day of March, 1921.

' ALBIN DANIELSON. Witnesses:

SARAH SMITH,

MARGARET KoEHL.

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