US359140A

US359140A - Goffe

Info

Publication number: US359140A
Authority: US
Publication date: 1887-03-08
Anticipated expiration: 1904-03-08

Description

(ModeL) 2 Sheets-Sheet'l.

A. DESGOPFE 86 L. DE GEORGES.

SGREW'PROPELLER.

Patented Mar. 8, 1887.

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(Model.)

S E R O E GR Em L0 R &P. W E FM Mm G S E D A No. 359,140. Patented Mar. 8, 1887.

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UNITED STATES PATENT OFFICE,

AUGUSTE DESGOFFE AND LEONIDAS DE GEORGES, OF ODESSA, RUSSIA.

SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent No. 359,140, dated March 8, 1887.

Application filed November 29, 1886. Serial No. 220,149. (Modch) Patented in Russia April 28, 1886, No.3,868; in France May 29, 1886, No. 163,710; in Eng'and June 1. 1886, No. 7,351; in Germany June 5. 1886, No. 4,451, and in AustrimHungary June 5, 1886, No. 1/42.

To' (ZZZ whom, it may concern.-

Be it known that we, AUGUSTE Dnseorrn and LEONIDAS DE Gnonens, the said Dns- GOFFE being a citizen of the Republic of France and the said DE GEORGES being a sub jeet of His Majesty the Emperor of Austria, but both being at present residents of the city of Odessa, in the Empire of Russia, have jointly invented a certain new and useful Improvement in Propellers, (for which said improvement Letters Patent have been obtained at the time of making this application in the following countries, but in no others, to wit: Russia, No. 3,868, dated April 28 and May 10, 1886; France. No. 163,710, dated May29, 1886; England, No. 7,351, dated June 1, 1886; Germany, No. 4,451, dated June 5, 1886, and Austria-Hungary, No. 1 1-2, dated June 5, 1886;) and we do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it ap pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and in which-- Figure 1 is a perspective view of a portion of the stern of a vessel provided with our improved propeller. Fig. 2 is a front view of the propeller. Fig. 3 is a rear view of the same. Fig. 4 is a view of the hub. Fig. 5 is aview of one of the blades removed from the hub. Fig. 6 is a side view of the propeller; and Fig. 7 is a sectional view of one of the blades on line m 00, Fig. 5.

Similar numerals of reference indicate corresponding parts in all the figures.

Our invention has relation to screw-propellers, principally intended for the propulsion of vessels in navigation, although the propeller may be used for propelling aerial vessels or for other purposes where a propeller is desired; and it consists in the improved con struction and combination of parts of such a propeller, as hereinafter more fully described and claimed.

In the accompanying drawings, the numeral 1 indicates the hub, which in the present case is shown formed with three faces, 2, although the hub may be formed with a greater or smaller number of faces, according to the number of blades used, and with a flat rear face, 8. The flat faces of the hub are formed with a straight rear edge, 4:, and with a parallel forward edge, 5, the said forward edge being formed by a projecting web, 6, at that end of the fiat face, the edge of this web being at a right angle to the forward and rear edges, and the inner edge of the fiat face is formed with an oblique shoulder, 7, converging from the rear edge of the face to the line at which the plane of the face is tangential to the circumference of the hub.

The blades 8 are triangular in shape and formed with a pointed projection, 9, at the inner corner or angle, the said projection having one edge in line with the rear edge, 10, of the blade, while its other edge is at an obtuse angle to the forward edge, 11, of the blade, and the blade is bentat an obtuse angle, nearly right, at a line extending from the rear corner of the blade to the point of the angle formed between the forward edge of the blade and the edge of the projection, the said bent portion being in a plane nearly parallel with the axial line of the hub and of the propellershaft.

The rear edges of the blades are in a plane at right angles to the axial line of the hub, while the forward edges of the blades are in planes radiating from the said line, the inner portions of the bentrear portions of the blades, together with the projections, being secured to the flat faces of the hub by means of screwbolts 12, or similar means, the forward edges of the projections of the blades being placed to bear against the oblique shoulders at the inner ends of the flat faces of the hub.

The larger forward portions of the blades have a slight curve convex upon the forward faces of the blades, and it will be seen that as the propeller is revolved the forward edges of the blades will cut freely into the volume of water in front of them, whereupon the water will meet with some resistance on arriving to the rear bent portions of the blades, which will thus allow the blades to acquire a hold or bearing against the water, increasing the effeetiveness of the propeller.

The blades will have a secure place of attachment upon the fiat faces, the edges of the projections bearing against the oblique shoulders, and the webs forming the extensions of the faces will brace the blades, assisting in se- 5 curing them firmly.

The curve of the outer edges of the blades depends on the number of the blades employed, the curve, however, forming, preferably, a portion of a circle when the propeller is seen 1 from either end.

The propeller may be provided with any number of blades, and numerous modifications in the construction of the propeller may be made without departing from the spirit of our 1 invention, and it may be used at the bow of a vessel as well as at the stern, or in any other desired place and location which may be found expedient.

It will be seen that by having the rear edges of the blades in a plane at right angles to the axial line of the hub and propeller-shaft the well or cut-out portion at the stern of the vessel for the screw may be made comparatively small, as the rear end of the propeller may be 9 5 brought directly up against the stern-post of the vessel, so that the vessel will not be weal;- ened uudulyloythe cutting out of the said well in the stern.

Having thus described our invention, we

claim and desire to secure by Letters Patent of the United States-- 1. In a screw-propeller, the combination of a hub having flat faces, a shoulder at one end of each of said faces, and a blade secured upon each face, the inner portion of which bears against said shoulder.

2. In a propeller, the combination of a hub having flat faces, an oblique shoulder at one end of each of said faces, and a blade secured to each of said faces, the inner end of which is triangular and bears against said shoulder.

3. In ascrew-propeller, the combination of a hub having fiat faces, a triangular blade secured to each of said faces, the rear edges of which are in a plane with each other and with the rear face of said hub and the forward edges are pointed, and the intermediate portions of said plates are bent or curved at an obtuse angle.

In testimony that we claim the foregoing as our own we have hereunto affixed our signatures in presence of two witnesses.

AUGUSTE DESGOFFE. LEONIDAS DE GEORGES. \Vitncssesr H. I". RUNGR, F. S'rnrNNs.