US1307106A

US1307106A - Strong

Info

Publication number: US1307106A
Authority: US
Publication date: 1919-06-17
Anticipated expiration: 1936-06-17

Description

W. H. ARMSTRONG'.. PROPE,LLER.- APPLICATION HLED SEPT. 2a, 1011.:

$51 N. 8. MM"

Patented June 17, \l 919.

2'SHEETS-SHEET 1.

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W. H. ARMSTRONG.

PPPP EL LER 7 Patented June 17, I919. 2'JSHEETS EEEEE 2.

WILLIAM H. ARMSTRONG, OF WASHINGTON, DISTRICT OF COLUMBIA.

PROPELLER.

Specification of Letters Patent.

Patented June 1'7, 11919..

Application filed September 26, 1917. Serial No. 193,303.

To all whom it may concern Be it known that 1, WILLIAM H. Airmsrnomaa citizen of the United States, res1ding at Washington, in-the District of C0- lumbia, have invented a new and useful Propeller; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and use the same.

The present invention relates to certain new and useful improvements in screw propellers, and has for its object'to provide a device of this character Which embodies novel features of construction whereby it can be used with the maximum efficiency upon boats, aeroplanes, fans, and the like, the design being such that the blades will take a firm hold upon the particular fluid medium in connection with which it is used and enable a maximum speed and power to be obtained from the energy expended in driving the same.

Among the provide a propeller for the propulsion of marine vessels, the blades of the propeller having a large surface for engagement with the water, and being adapted to have sucha pitch as to give a strong backward pull when the propeller is reversed, tllereby enabling the vessel to be manipulated in a most effective manner for dodging a torpedo in theevent it may be attacked by a submarine. This strong backward pull which can be obtained by the use of the propeller would enable the forward progress of the vessel to be quickly checked whenever necessary. v

A further object "of the invention is to provide a propeller which can be driven at the high speed required upon aeroplanes without danger of breaking and jeopardizing the lives of the aviators. The risks and dangers of aerial navigation will thus be greatly decreased by the use of a propeller of this character; and at the same time the driving power of the engine'will be utilized to the greatest advantage.

Still further objects of the invention are to provide a screw propeller which is comparatively simple and nexpensive in its construction, which can be readily assembled and taken apart, and which embodies a novel design whereby a maximum efiiciency and power is obtained.-

With these and other obiects in view, the

anetal blanks objects of the invention is to source, of power.

invention consists in certain novel combinations and arrangements of the parts as will more fully appear as the description proceeds, the novel features thereof being pointed out in the appended claims.

For a full understanding of the invention,

reference is to be had to the following description and accompanying drawings, 1n

which Figure 1 is afront elevation of a screw propeller constructed in accordance with the invention.

' Fig. 2 is a side elevation of the same.

Fig. 3 is an enlarged side elevation of the hub member to which the propeller blades are'attached, portions being broken away and shown in section to illustrate more clearly the details of construction.

Fig. 4 is a plan view of one of the sheet from which -the propeller blades are formed.

Fig. 5 is a perspectiveview of the blank after it has been bent into shape.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

' Referring to the drawings, which illustrate one possible embodiment of the invention, the numeral 1 designates a propeller shaft which may be driven from any suitable The propeller hub is fitted upon the end of the shaft 1, said hub including a spacing sleeve 2 and a pair of opposed end caps or

heads

3 and 3 respectively, which fit against the ends of the sleeve 2 and are held in a properly spaced relation thereby. The cap 3 at the end of the shaft preferably has a rounded end, as indicated on the drawing. The two

end caps

3 and 3 are formed with corresponding sets of short radial arms 4, the ends of the arms being bent inwardly at 4? so as to eX- tend parallel to the axis of the shaft 1, said arms terminating in outwardly projecting bifurcated clip members 5 which receive the ends of the propeller blades 6. These bifurcated clips 5 are inclined and arranged at an angle to the axis of the propeller shaft 1, and the sides thereof are provided with ing sleeve 2 and shaft 1, thereby locking the hub member rigidly in position upon the shaft and holding'the

end caps

3 and 3*, as well as the sleeve 2, in proper relation to each other.

Each of the propeller blades'6 is formed of a single piece of sheet metal which has an eccentrically arranged opening 6 therein, the narrow side of the plate being severed by a radial slit 6", as indicated by Fig. 4. The free ends provided by this slit 6" are sprung laterally in opposite directions from the plane of the sheet metal blank, thereby twisting the blade into proper shape and imparting a pitch thereto so that it will act as a screw element for propelling a marine vessel, airship, or the like. A series cftthesej propeller blades 6 are arranged around the propeller shaft 1 and connected to the clips 5 of the hub, and such a propeller has been found to possess great efficiency and to have a maximum propulsive power for the energy expended in driving the same. When the propeller is to be used upon a marine vessel which must risk the possibility of an attack by a hostile submarine, the pitch of the blades is such that a maximum backward pull or reversing power is possible, this being obtained even.

with the possible loss of some of the direct power of the propeller, since this backward pull or reversing power is essential to an efi'ective manipulation of the vessel when an attempt is made to destroy it with a torpedo fired from a submarine.

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

1. A screw propeller including a hub member adapted to be fitted upon a shaft and formed with aspacing sleeve and end caps which are provided with corresponding sets of laterally projecting bifurcated clips, transverse pins extending through the spacing sleeve and engaging the end caps to hold the members in position, and looped propeller blades formed of flat plates and having the extremities thereof secured within the bifurcated clips of the end caps.

2. A screw propeller including a hub mem-v 'to the axis of the sleeve,

ber adapted to be fitted upon a shaft and formed with a spacing sleeve and end caps which are provided with corresponding sets oflaterally projecting arms, the ends of the arms being bent inwardly parallel to the sleeve and terminating in outwardly projecting clip members, transverse pins extending through the inwardly ibent ends of the laterally projecting arms and also through the spacing sleeve to hold the members in proper relation, and looped propeller blades formed of flat plates and having the extremities thereof secured within the bifurcated clips of the end caps.

3. A screw propeller including a hub member adapted to be fitted upona shaft and formed with a spacing sleeve and end caps which are provided with corresponding sets of laterally projecting arms, the ends of the arms being bent inwardly parallel to the sleeve and terminating in outwardly proj ecting bifurcated clips arranged at an angle and looped propeller blades formed of flat plates and gradually decreasing in width from the middle portions to the extremities thereof, said extremities being secured within the bifurcated clips of the end caps.

A screw propeller including a hub mem- :ber adapted to be fitted upon a shaft and formed with a spacing sleeve and end caps which are provided with corresponding sets of laterally projecting arms, the ends of the arms being bent inwardly parallel to the sleeve and terminating in outwardly projecting bifurcated clips arrangedat an angle to the axis'of the sleeve, and propeller blades formed of substantially circular plates of sheet material having eccentric openings therein and slit radially at thenar-' row sidethereof, the free ends provided by the slit being drawn apart and engaged by