US1403729A - Propeller - Google Patents

Description

A.A BALAGUER.

PROPELLER. APPL'ICATION FlLED JULYZI |919.

1,403,729. Patented Jan.17,1922.

A. BALAGUER.

PROPELLER. APPLICATION FILED JULYZI, 1519. 1,403,729. Patented Jan. 17,1922.

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PROPELLER.

APPLICATION FILED IUI.Y 2I. I9I9.

1 ,403,729. Patented Jan. 922.

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Vgn (Ires facyae UNITED STATES PATENT OFFICE,

AN'DRES BALAGUER, OFMARIANAO, HABANA, CUBA.v

PROPELLER.

T0 all whom t may concern:

Bc it known that I, ANDRES BALAGUER, a citizen of the Republic of Cuba,and a resident of Marianao, Province of Habana, Cuba, (whose post-oilice address is Sama Street No. 31, Marianao, Province of' Habana, Cuba,) have invented certain new and useful Improvements in Propellers, of which the following is a specification.

This invention relates to screw-propellers for ships and one of its objects is to provide a propeller having blades of novel form and arrangement by means of which friction is reduced between the blades and the water in which the propeller rotates.

Another object of this invention is to provide a form of propeller which causes the water as it is thrown out to attain the spiral form rearwardly in the longitudinal direction of the rotating propeller shaft and thus increase the efliciency ofthe propeller.

The invention is described with reference to the figures of the annexed drawings, in which:

Fig. 1 is a vertical projection and Fig. 2 is a horizontal projection of the geometrical formation'of the blades of this new propeller. j

Fig. 3 is a side elevation of a two-blade propeller made according to this invention.

Fig, 4 is a front end view of the same twoblade propeller.

Fig. 5 is a side elevation of a threeblade propeller made according to this invention.

And Fig. 6 is a front end view of the saine three-blade propeller.

This propeller comprises a hub 1 from which lead blades 2 outwardly and rearwardly directed in an inclination of degrees from its axis with respect to the rotating shaft and in a spiral deviation from Specication of Letters Patent. Patented Jan. 17 1922.

Application led July 21,

1919. Serial No. 312,282.

the hub 1, each blade presenting a conical surface and forming' between each two adl jacent blades ak parabolical curve limiting 'j the space comprised between same.

The formation ofthe conical surfaces of' blades 2 in axial spiral lineis obtained by Y intersecting a conical body 3, 4, 5 whose angle at the vertex is of 90 degrees, with a plurality (two or three) cylindrical bodies of parabolical section 6, 7, 8, 9 and 10, 11, 12, 13 so arranged as to form angles of 45 degrees with the base of cone 3, 4, 5 and with the axis of the same cone. The resulting intersection curves 14, 15, 16 and 17, 18, 19 define the contour of the surface portions of cone 3,4, 5 which constitute the blades 2` and which terminate at its inner upper end'` on a periphery of hub 1 in a spiral curve. And two conicl surfaces oftwo adjacent blades 2, Figsj Vand 4, constitute a para` bolical curve 12, 2, 19. The blades 2 have their front edges sharpened in order to aid the passage of theblades through the water.

The end of blades 2 opposite hub 1 is preferably slightly deviated outwardly from the rotating shaft with the aim in view that the mass of water gathered by each blade 2 when being thrown out may find an outwardly deviation from the propeller, thus aiding the escape thereof without producing friction or retrocession which are so disadvantageous in the propellers at present in use.

IVhat I claim is:

A propeller Ycomprising a hub and blade leaning outwardly and rearwardly from the hub and at an angle of 45O from the axisV ANDRES BALAGUER.

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