US341137A

US341137A - Propeller for vessels

Info

Publication number: US341137A
Authority: US
Publication date: 1886-05-04
Anticipated expiration: 1903-05-04

Description

J FORGIE PROPELLER FOR VESSELS. No. 341,137. Patented May 4, 1886.

L e d o M 0 N UNITED STATES PATENT OFFICE.

JOHN FORGIE, OF HICKSVILLE, NE? YORK.

PROPEL'LER FOR VESSELS.

fESPEClEICATIQN forming part of Letters Patent No. 341,137, dated May 4, 1886.

Application filed November 5, 1885). Serial No. 181,962.

To aZZ whom it 'mcty concern:

Be it known that I, JOHN FonGIn, of Hicks ville, in the county of Queens and State of New York, have invented certain new and useful Improvements in Propellers for Vessels; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompany- 1ng drawings, and to letters of reference marked thereon, which form a part of this specification.

Propellers as usually constructed have no means for reducing or lessening the resisting force. of the opposing bank of accumulating water which gathers up in advance of them or of the vessel as the latter is driven through th ewater.

The object of my improvement is to create by suction or centrifugal action a displacement of or a removal to a great degree of such accumulation or opposing bank, and thereby to relieve the vessel of much of the resistance offered by such bank.

The invention consists of a special construction, which will presently fully appear from the following description.

Figure 1 illustrates a plan View of a propeller embodying my improvements, a portion of the top being broken away; Fig. 2, a crosssection at the line 00 m of Fig. 1, the propellerwheel being omitted; Fig. 3,?t cross-section in the same line, and showing the propellerwheel; Fig. 4, an end view at the forward end or mouth; and Fig. 5, a diagram showing, by way of illustration, the relative positions two of my propellers may occupy with reference to each other when located near the bow of a vessel, and indicating also the relative directions of their revolutions when placed anywhere on opposite sides of the vessel.

A represents a marine or propeller screw, which in itself may be of any known or desin able form for acting on the water by its revolution on its axis. To each spiral part or wing to, I connect, or, preferably, make integral therewith, a longitudinal blade, B, extending in a direction lengthwise of,or,in other words, parallel with, the propeller-shaft 0, so that when all these wings, with their-blades B, are

(No model.)

put together the wings constitute the screw propeller proper, and these longitudinal blades constitute at their rear ends a sort of case for the several blades, or, rather, the propeller is inside this group of blades. The other or forward extremities of the blades are supported *hpOn any appropriate support, (I, on the pro -stand off farther from the shaft than the overlapped edge g, thus leaving a clear open space between them for the wholelength of the blades.

By this construction,when the propeller and 7 its shaft are revolving in the direction indicated by the arrow marked 1. in Fig. 3, the blades B, revolving in the same direction and diverging from the center of the structure, as

shown, tend on their exterior to force the water laterally or by a centrifugal action away from themselves, thus inviting the entrance of the water at the mouth from the accumulating bank of water at the front, and creating a suction from center to circumference, and to cause a displacement or removal of the accumulating and opposing bank of Water.

In addition to the blades B, I also employ a series of flanges, I, placed one on the outside of each of the blades at or near their forward ends, as shown. They are set in a spiral position relatively to the line of the blades and of the shaft, and at right angles to the outer surface of the blade, and at the same pitch as the wings of the screw A. The object of these flanges is to serve as an auxiliary propeller at the forward end of the blades; but, being placed farther from the axis or shaft, they describe a larger path or curve in screwing and cutting through the water, and may be considered as supplemental wings for the pro peller A. As these flanges are at the forward end of the blades B,the shape of the vessel toward its bow affords ample room for them,and they could not in most cases be put atthe rear enderthat is, one capable of running with,

end of the blades for the lack of such space, or without cutting too far into the side of the vessel to make room for them.

The blades B may be two or more times as longas the greatest diameter of the wheel A, or of any length desired.

My improvement may be placed on the bow of a vessel, or onboth sides of the bow, or on the stern, or on both sides of the stern, or on any other part of the vessel, as may be found desirable. When placed on both sides of a vessel, one should revolve in one direction and the other in the reverse, thus making when in action a right and a left hand screw.

It will of course be understood that the shaft of this propeller is to be supported in any suitable maner on the vessel, and that it is to be driven by any suitable motive power.

When my improvement is placed both in the bow and stern of a vessel, it will convert such vessel into what is known as a doubleeither end foremost- It will be seen that the customary banking v of the water is utilized, and becomes by my improvement an efficientagent in propelling. Several supports d may be employed, if de sired, dependent upon the length of the blades B, and they should be constructed to offer as little resistance as practicable to the water.

I claim- 1. In combination with a propeller-wheel, the system of longitudinal blades B, overlapping each other, and surrounding and supported by the propeller-shaft, and extending forward from the wheel, and serving as set forth, to cause displacement or removal of the water from the accumulating bank of water.

2. In combination with the propeller-wheel, the longitudinal blades overlapping each other, and surrounding and supported by the propeller-shaft, and the spiral flanges I, severally applied to the blades at or near their forward ends, and for the purpose set forth.

3. In combination, the propeller-wheel, the longitudinal blades B,with their flanges I, the interior support having curves 6, and secured to the shaft, and adapted for supporting and holding the blades in their proper positions forward of the screw.

JOHN FORGIE.

Vitnesses:

JOHN E. BEALL, J. J. HALSTED.