US1368747A - Propeller - Google Patents

Description

W. J. P'ATTOSIEN.

PROPELLER. APPLICATION FILED JUNE 28, um.

Patented Feb. 15, 1921.,

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face of the ordinary propeller.

area STATES earner orrica. v

WILLIAM J. PA'ITOSIEN, OF SAN FRANCISCO, CALIFORNIA. I I

PROZEELLER.

' Specification of Letters Patent.

1920. Serial No. 392,261.

To all whom it may concern:

Be it known that I, WILLiAM J. Parro- SIEN, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented a new and useful Propeller, of which the folcreases and in which the pitch of the blades decreases as the speed of the ship decreases.- I attain this object by the mechanism illustrated in the accompanying drawing, 111

which Figure 1 is a rear view of the propeller, rotating in the direction indicated by i the arrows and Fig. 2 isa sectional view of one of the blades along line 22 of Fig. 1, dotted lines indicating different positions of the blade.

Referrin to the drawing 1 represents the propeller s aft to which is rigidly secured" the hub 2 from which radiate three arms 3, rigidly connected with the hub 2. The blades 4 present a working or rear face 6 somewhat similar to the workin or rear ut while in the ordinary propeller'the blade has substantially the shape of a plate, with a front face substantially parallel to the rear or working face, my propeller blade has the shape of a. rather heavy block the cross-section of which is defined by the above-mentioned working face 6, having a rearward edge 8 and a forward edge 9, a trailing face 5, meetin' the working face 6 at edge 8 and forming with it the obtuse angle a and an outwardl curved face 14, joining edge 9 of the wor ing face 6 with e ge 10'of e trailing face 5. Near its working face 6,

" but closer to the rearward edge 8 than to the forward edge 9 and closer to the forward edge 9 than to the trailing edge 10, the blade is provided with a bearing 11 adapted to-fi t on one of the radial arms 3. When in position, the blade is free to rotate on said radial arm 3. The blades are here shown as being considerably shorter than the'arms 3, occupying only their outer half, but they may; be extended inwardly, the only essential point bein that they must be free to rotate.

Mg propeller works as follows: While the ship and the propeller are at rest, the blades may assume any position imparted to them by the currents of the water or any other influences acting under the surface of the water. As soon as thepropeller is set 1n motion and the arms begin to rotate the blades will assume a clearly defined position. The bearing 11 being near the working face the latter will attack the water at an angle of incidence'defined by the position, within the above-mentioned limits, of

bearing 11 with reference to the edges 8, 9 and 10,-by the width of the trailing 5 and the size of angle a. The closerthe bearing 11 is to edge 8, the larger will be the initial angle of incidence, and vice versa, the more the bearing 11 approaches the center between edges 8 and 9 the smaller will be the initial angle of incidence of the working face. Likewise, the narrower the trailing face 5 and the smaller the angle a are, the larger will be the initial angle of incidence of the working face 6. As long as the bearing 11 is near the working face 6 and closer to the edge 8 than to edge 9 and closer to edge 9 than to edge 10, the other dimensions Patented Feb. 15, 1921.

c t ti n of application Serial No. 340,679, filed November 25, 1919. This application filed June 28,

referred to may be selected to give the working face 6, within reasonable limits, any initial angle of incidence desired under any given conditions.

, This initial angle of the working face 6 will" change as soon as the ship moves forward on account of the resistance offered by the water to the front face 14 of the blade, hereinafter referred to as the balancing face, which resistance increases as the speed of the ship increases. This resistance or pressure may, for the purposes of this description, be assumed to be evenly distributed over said balancing face 1% of the blade. Now the whole blade pivots on the arm 3, that is, it is a lever having the arm 3 for its fulcrum, the end of the blade defined by edge 10 constitutin'g one arm of the lever and the end defined by edge 9 defining the other arm of the lever. As before stated, the former arm is the longer one and, if equal'pressure is exerted on both arms, this arm will tend to pivot rearwardly, forcing the other arm forward. Thistendency will increase as the pressure increases, that is, as the speed of the ship increases. Since any pivoting backward of the arm defined by edge 10 increases the angle of incidence, as shown by the dotted outlines in Fig. 2, it follows that the angle of incidence of the propeller increases as the speed of the ship increases.

limit is set to the increase of the angle of incidence by the fact that the trailing face 5, which in the beginning does not engage the water, gradually changes as the pitch increases, to a position where it does attack the water (as shown in the extreme dotted outline in Fig. 2). Itspressure on the water increases as the pitch increases and, at a certain point, will balance thepressure of the water on face 14'tending to increase the pitch. Atthis point the pitch will become stationary,

It is evidentthat the above described p'ropeller will work on -aeroplanes in substantially the same way as on ships and that the number of blades is notlimited to three.

Where it is desired to have the initial angle of incidence adjustable, the hole in the blade carrying bearing 11 may be made slotted so as to allow of a certain adjustment of the bearing 11 with reference to the edges 8, 9 and 10.

"-of the blade I claim:

1.In a propeller the combination of a hub, having two or more radiating arms, 4

with propeller blades pivoting on said arms; the cross-section of the blades to be defined by a working face, a trailing face and a balancing face, the pivotal point being near the Working face,.closer to its junction with the trailing face than to its junction with the balancing face and closer to the latter junction than to the junction of the trailing face with the balancing face.

In a propeller a blade adapted on an axis inside the blade,

v the cross-section to be defined bya Working face, a trailing face and a balancing face, the pivot being near the working face, closer to its junction with the trailing face than to its junction with the balancing face and closer to the latter junction than to the junction of the trailing face With the balancing face,

substantially as described.

WI LIAM J. PATTOSIEN.

to pivot

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