US2508160A - Marine propeller - Google Patents

Description

May 16, 1950 o. E. HANSEN MARINE PROPELLER Filed May 12, 1947 IN V EN TOR. 0L 5 E. HANSEN ATTORNEY Patented May 16, 1950 UNITED STATES PATENT OFFICE MARINE PROPELLER Ole E. Hansen, Brooklyn, N. Y.

Application May 12, 1947, Serial No. 747,541

2 Claims. (01. 170-466) The present invention relates to propellers, and particularly to marine propellers for propelling ships and boats.

The main object of my invention is to provide a marine propeller with means for preventing the Water driven thereby from whirling out radially or fanning out from the tips of the propeller blades.

Another object is to have the propeller equipped with means for forcing the water directly rearwardly or forwardly of the same when rotated in order to render the propeller as effective as possible in converting the power or rotation of said propeller into forward motion of a boat driven thereby.

A further object is to construct a, propeller in such a reinforced form that the blades of said propeller are prevented from breaking off even during the hardest kind of usage.

It is also an object to have a marine propeller of such construction and form that it is not only efiicient when being driven forward, but just as eiiicient when driven backwards.

Other objects and the advantages of the invention will appear in further detail as this specification proceeds.

In order to bring out the features of construction in comprehensible manner, the propeller is illustrated in the accompanying drawing, forming part hereof, and in which,

Figure 1 is a front elevation of a propeller made according to my invention and embodying the same in a practical form.

Figure 2 is a rear elevation of the same propeller.

Figure 3 is a side elevation of the propeller as seen from the right in Figure 1, with a portion of the ring out out to disclose structural detail.

Figure 4 is a plan view of the propeller as seen from above in Figure 1.

Figure 5 is a transverse section taken on line 55 in Figure 2.

Throughout the views, the same or like parts are indicated by the same reference numerals.

In marine engineering, it is well known that a propeller is the best form of propulsion means, provided that the form of the screw blades is theoretically correct, so that a maximum driving effect will be obtained in the water. However, it is matter of common experience that when a propeller is rotated beneath a ship, the water is not only cut by the propeller so as to drive the ship forward, but the water is also caused to whirl radially, more or less in a widening cone behind the propeller as well as about the same, because the blades tend to carry the water around with them during rotation, all such outward or expanding movement of the water being lost power. Obviously, if all of the water with which the propeller blades come into contact can be forced to remain in alignment with the propeller shaft, the blades will have their full effect to drive the ship without wasting power inmerely spreading the movement of the water around the propeller, as is usually the case with known propellers;

Hence, it is now proposed to provide a propeller with a special form and then combine it with a confining ring for the water through which the propeller is to operate.

Thus, in the practice of my invention, and re=- ferring now again to the drawing, a propeller, generally indicated at 9, has a pair of inclined blades l0, In which have their leading edges II, I I curved and unbroken from their outer ends to the hub l 2 which is pierced by a hole l3 to allow the propeller to be mounted on a shaft. Beyond the other end of the hub the trailing edge continues again at M and arches outwardly at the end thereof.

Mounted concentrically with the hub I 2 is a wide ring l5 combined with the propeller blades so that the latter are largely disposed within the same. The rear portion M of the trailing edge terminates radially at the rear edge 16 of the ring IE, but the outer ends of the blades [0, l 13 project beyond the other edge of said ring at H. The latter edge I! is built up at I8, l8 (one shown in Figure 3), so that the blades will be as rigidly supported as possible and also that the water entering the ring during operation will be directed into said ring from the blades. The latter continue exteriorly from the ring .at l9, l9 so as to correspond in form with the inner inclined portions 20, 20 of the blades within the ring. The latter is exteriorly beveled at 2| toward the rear, and in fact the interior is correspondingly slightly reduced in diameter at 22 to further restrict the movement of the water passing through the ring past the blades during rotation of the propeller. The trailing edge 23 has only a short portion thereof exposed beyond the ring, and as the greater portion of the corresponding inner inclined continuous sections of the blades at 20, 20 are attached to or integral with the ring, the blades are well reinforced.

The rearwardly bent or arcuate portions 24, 24 of the blades at the outer edges H, H are practically scoop shaped beyond the portions l4, H where said portions arch back toward the rear edge 16 of the ring. The blades may be welded,

brazed or soldered to the ring, and they, as well as the ring and hub may be made of brass, bronze or steel or of any metal.

When the propeller as seen in Figure 1 is rotated counterclockwise, or to the left, the leading edge I l on each blade will draw said propeller through the water in forward direction, the bulk of the water engaged going through the ring and passing directly rearward as it is prevented by the ring from spreading out radially, and due to the constriction of the latter, the water is concentrated s it is projected rearwardly. Even the water passing the exterior of the ring is held in active contact with the same and the outer portions of the two blades. If it is desired to back the ship, rotation in clockwise direction as seen in Figure 1 will cause the water to enter the rear edge of the ring and follow the blades therein and issue from the front of said ring and leave the blades in a very direct and efficient manner, so that even when backing, the blades will have their full eflfect upon the water.

Manifestly, variations may be resorted to, and parts and features may be modified or used without others, within the scope of the appended claims. For example, instead of using two blades, three, four or five or more may be combined with the ring, if desired.

Having now fully described my invention, I claim:

1. In a propeller having a central hub and a ring spaced from the hub in concentric relation therewith, and a plurality of propeller blades connecting the hub with the ring, the features which include having the blades inclined with respect to the axis of said hub and the blades extended through the ring at both ends of the latter with said blades terminating rearwardly at the radial diameter of said ring and forwardly extending in advance of and exteriorly of the outside diameter of the same ring, the portions of the blades disposed Within the latter being continuously inclined with respect to said hub axis and continuous with the forwardly and rearwardly extending portions of said blades beyond the forward and rear ends of the ring.

2. A propeller according to claim 1, wherein the ring has a cylindrical portion and a frustoconical portion connecting directly with said cylindrical portion.

OLE E. HANSEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 532,493 Kusminsky Jan. 15, 1895' 1,653,342 Chillingworth Dec. 20, 1927 FOREIGN PATENTS Number Country Date 4,718 Great Britain Of 1909 192,908 Great Britain Feb. 15, 1923 322,025 Italy Oct. 25, 1934 339,176 France Dec. 19, 1904

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