US24508A

US24508A - Improved screw-propeller

Info

Publication number: US24508A
Authority: US
Publication date: 1859-06-21
Anticipated expiration: 1876-06-21

Description

UNITED STATES PATENT OFFICE.

J. J. E. VEEGNE, or rAErs, FRANCE.

lIVIPROVED SCREW-PROPELLER.

To all whom, it may concern,.-

Be it known that I, JULES JEAN BAPTISTE VERGINE, of Paris, and now residing at rI`oulon, in the Empire of France, ofiicer'in the Imperial navy, have invented an Improvement in Screw-Propellers; and I do hereby declare that the following is afull, clear, and exact description of the saine, reference being had to the annexed sheet of drawings, making a part of the same.

My invention relates to improvements in screw-propellers for vessels7 which improvements are intended to prevent the molecules of water struck by the screw from passing toward the periphery by yielding to the centrifugal force and from producing pre] udical eddies. I obtain these results by means of grooving or iiuting the surface of the screw, instead of using a plain surface, as usual. By fluting the surface of the screw 7 I mean making grooves in the body of the metal; or the grooved surfaces may be produced by means of raised ribs affixed to the screw-surface, which ribs may be either inclined or curved. toward the center of the screw, or the reverse, or stand at right angles to the face of the screw. I form these grooves on the surface of the screw, either in the direction in which the screw is generated, or they may be at angles or inclined thereto, as may be most desirable.

My invention consists in arranging the grooving, fluting, or ribs in the form of a series of steps rising one above the other as they approach from the center toward the periphery. By this arrangement all the ribs are made to act in the most effective manner upon the water, any molecules that pass one rib being caught by the next higher rib adjoining, and so on from the center of the propeller to the periphery, the outer rib being the highestof all.

I will now proceed to describe my invention in detail, reference being had to the annexed sheet of drawings, and to the letters marked thereon, in which- Figure l shows a side view of the screwpro peller provided with the grooves or iiutings. Fig. 2 represents a Vertical projection or plan of the same perpendicular to the axis of the shaft. This screw, which in the said figure is represented with two branches, may of course be provided with three, four, or six branches having a certain number of grooves or iutings.

Fig. 3 is the section through a plan perpendicular to the axis of the shaft, showing the two branches of .the screw and the form of the grooves or iiutings. Fig. 4 is the horizontal projection of the screw. through a plane parallel to the axis ofthe shaft. Fig. 5 is a section of the groove or fluting through the line a b of Fig. 2. Fig. 6 is a sect-ion of the samethrough the line cd of Fig. 2. Fig. 7 shows a sectional Y view of the same through m n of the said fig- J. J. E. VEEGNE.

IVitnesses:

TAUDEIA, GARDIssAL;