US1467515A - Propeller - Google Patents

Description

T. B; STEWART PROPELLER sept. 11, l1929,. msnm Filed Nov. 5, 1921 y, STEWART if @3912* bl@ @www Patented sept. i1, 1923.

UNITED STATES PATENT oFFic MeansI f THOMAS B. STEWART, OE LOS ANGELES, CALIFORNIA.

PROPELLEB.

Application led November 3, 1921. Serial Ho. 512,552.

To 110m it may concern Be 1t known that I, THoMAs B. STEWART, a cltlzen of the United States, and resident of Los Angeles, in the .county of Los Angeles and State of California., have invented certain new and useful Improvements in Pro` pellers, of which the following is a specification. v

This invention relates to .propellers for motor driven vessels, the object of the invention being the provision of means for conlining the water adjacent to the propeller blades in such manner as to employ the full force of the water during the entire revolution of the propeller; a. further object being to provide a device of this character which embodies simplicity of construction with great durability.

In carrying out my invention for the attainment of these objects I employ a propeller havin a plurality of flat blades xed to a hub an set obliquely to the axis of the hub shaft and which are respectively of equal width at their outer and inner ends, said blades respectively having a flanged outer end, which is bolted to an annular rim, and an obliquely extended hereinafter fully described and specifically set forth in the appended claim.

In the accompanying drawings forming part of this specification, Figure l1. is a rear end view of an embodiment of my improvements;

' Fig. 2 is an edge view thereof;

Fig. 3 is a fragmentary sectional view,

drawn on an enlarged scale .and taken on the axle vof the hub, and to which are attached, by means of rivets 4, the inner ends of sheet metal vblades 5, which are ne ectively of equal width attheir outer an inner ends and having respectively a rearward extended an 6 and an edge part 5*, which is extended o liquely vfrom the body part 5,

- length an edge part, as

The ianges 6 are respectively attached, by means of rivets 7, to an annular rim or band 8, having a, forward beveled edge9 on the inside, and a rearward beveled edge 10 on the outside.

This rim is somewhat wider than the blades 5 and extends rearwardly from the edges o f 'said' blades, whereby there is an overhanging annular 'part at the rear of the pro eller. y

y employing a construction vof the character described I utilizethe force of the water during the entire revolution of the propeller, the rim 8 preventing lateral displacement of the water and the beveled edged parts of the structure acting to out the water as the ship moves forward; the blades bein of equal width throughout their tf having the.; obliquely directed edge parts exert their full power on the confined water within the rim, and therefore, increase the speed of the vessel. The o-bliquely directed edge parts ofthe blades constitutlng a very important feature of the invention. f

I do not confine myself to the exact details of mere mechanical construction and form of the arts as herein shown and described, as I be ieve that under the spirit of my invention I am entitled to such variations as may ri htly fall within the scope of the appende claim.

Having thus described my invention, what I ,claim as new and desire to secure by Letters Patent, is:

' A propeller comprising a hub, a. fiat annular rim surrounding the hub, a plurality of flat radiating blades connecting the hub and rim and confined wholly within the pane of the side edges of the rim, the blades ing of the same width throughout their entire lengths and disposed obliquely to the axis of the hub andhaving one of their side edges provided with angularly disposed a'n the leading edges of the rim and bla es being sharpened.

Signed at Los Angeles in the county of Los Angeles and State of California. this 17th day of May A. D. 1921.

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