US1604994A - Propeller - Google Patents

Description

Nov. 2 1926.

P. P. GROSSO ET AL PROPELLER Filed August 31, 1925 INVENTORS GPOSSO x714 .N I B Y 6 W/f/ Pg ATTORNEYS atented Nov. 2, 1926.

PATRICK P. GROSSO AND HARRY A. NEVV'KIRK, OF CHICAGO, ILLINOIS.

PROPELLER.

Application filed August 31, 1925. Serial No. 53,690.

Our invention relates to improvements in propellers for use particularly with water and air craft, and it consist in the combinations, constructions and arrangements herein described and claimed.

An object of our invention is to provide ,a propeller in which the propelling effect with blades of given dimensions is increased.

A further object of our invention is to.

provide a propeller in which the thrust in a propeller of given weight is increased.

A further object is to provide a propeller having blades in which streams of water are thrown rearwardly by centrifugal action, thus increasing the propelling effect.

A further object is to provide a novel form of propeller blade which is of relatively light weight, and which may be used in connection with boats or air craft.

Other objects and advantages will appear 'in the following specification, and the novel features of the invention will be*particularly pointed out in the appended claims.

Our invention is illustrated in the accompanying drawings, forming part of this application, in which v Figure 1 is a face view of the propeller,

Figure 2 is a side view of one of the blades, showing the latter tipped at the normal angle for use,

Figure 3 is an edge view of the blade,

Figure 4 is a section along the line 44 of Figure 8, and

Figure 5 is a section long the line 5-5 of Figure 3.

Referring now to the drawings, we have shown blades having a bod portion 1, which is preferably made 0 cast metal. This body portion, as will be observed from Figure 3, is dish-shaped on one side, as shown at 2, and is convex on the side 3. The body portion is hollow. The general shape of the hollow portion is shown in Figure 1. In this figure it will be observed that there is an opening 4: in the front edge of the blade near the inner end thereof. This opening communicates with the discharge opening 5,011 the dish-shaped side.

Connecting the opening 4 with theopening 5 is a passage 6, which is curved in the manner shown in Figure 1, and which tapers from the edge of the opening 4 to the opening 5. The wall of the passage 6 nearest the dish-shaped side follows the contour of said side, as shown in Figure 2, and the opposite wall follows in general the contour of the convex side 3, as shown in Figure 3.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. The propeller shown in Figure 1 is designed to rotate in the direction shown by the arrow, that is, clockwise as viewed in the figure. Besides the ordinary propelling effect which will be obtained by the face 2, water will be caused to enter the opening 4.- and will be forced through the opening 5 by the centrifugal action of the blade. There will therefore be issuing from each of the openings 5 a stream of water which, as will be observed from Figure 3, will be in a rear direction and substantially parallel with the axis of the propeller. This rearward stream will react on the water in which the propeller is submerged, and will cause an additional thrust to drive the boat or other craft forwardly.

blades provided with passages which permit the entrance of water nearthe inner end of the blade, and which cause the water to be thrown outwardly by centrifugal force,

and rearwardly to cause an: additional thrust, are contemplated as falling within the scope of the invention.

We claim:

1. A propeller blade graduated in thick ness from the inner to the outer end, one face of said propeller blade being dishshaped and the opposite face being convex, said blade having a relatively large opening in one edge thereof near the inner end of the blade and having a relatively small discharge opening on the dish-shaped side, and a curved passage tapering from the large opening to the smaller opening.

2. A propeller blade graduated in thickness from the inner to the outer end, one face of said propeller blade being dish-shaped and the opposite face being convex, said 5 blade having a relatively large opening in one edge thereof near the inner end of the blade and having a relatively small discharge 0 ening on the (lish-shaped side, anol passage tapering from the large opening to the smaller opening, the central axis of the smaller opening being substantially parallel with the axis of the pro ellei.

- PATRICK P. GROS

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