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Publication numberUS1082750 A
Publication typeGrant
Publication dateDec 30, 1913
Filing dateAug 12, 1912
Priority dateAug 12, 1912
Publication numberUS 1082750 A, US 1082750A, US-A-1082750, US1082750 A, US1082750A
InventorsPierre Jacomy
Original AssigneePierre Jacomy
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Metallic propeller.
US 1082750 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


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y werfe Jacomy,

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Specification of Letters Patent.

Patented Dec. 30, 1913.

Application filed August 12, 1912. Serial No. 714,696.

To all whom it may concern: Be it known that I, PIERRE JAcoMY, a

citizen of the French Republic, and resident at Asnires, France, have invented certam new and useful Improvements in Metallic Propellers, of which the following is a specication.

- The present invention consists in light hollow metal propellers for aviation' or navithickness.

gation apparatus, offering the same advantages as those of wooden ones but without the drawbacks of the latter. f

This invention consists in building hollow` propellers of a single piece of metal with reduced ends, by stamping, rolling, drawing, bending or otherwise, and by means either of a plate soldered with its edges in butt joint,or by means of a weldless tube.

-A construction of a hollow metal pro`l peller` according to the invention is illustrated by way of example in the accompanying drawing in which- Figure 1 is an elevation of the propeller, and Fig. 2 shows the different cross-sections made successively on lines 1 1 to 14.-14 of Fig. 1.

Accordingto this invention, aweldless metal tube a is used of given diameter and After a .preliminary machining, this tube is worked on a lathe or otherwise,

so as to reduce its two ends in a gradual manner, starting from a given distance of the tube the said reduction taking place in accordance with a law given by the shape and the resistance to be given to the different parts of the propellervfrom its center to the circumference. The tube a thus machined is stove in transversely from one side to the other, without removing any material, that is to say, provided with two diametri- Ically opposite openings, the edges b of which are bent inward. This arrangement insures a very great resistance of the pro-l peller at its central portion. Through the openings thus produced is introduced a sleeve c which is secured by autogenous welding or in some other way, to the edges of the openings in question, and constitutes the hub proper of the propeller. This sleeve c is bored in a conical, polygonal or cylindrical shape, according to the cross-section of the spindle intended to receive the propeller.

At each side of the hub b, the tube a is shaped by crushing it on stamps and mandrels or in any other way, so as to give to the two portions of the said tube such helical and curved shapes as may be desired in accordance with the pitch and diameter adopted. The closely adjoining two lips forming the ends of the blades, are then soldered together, and the whole of the propeller is then polished.

The propeller thus constructed, has no solution'of continuity, no joint of any sort and consequently offers the greatest possible resistance to the combined efforts of centrifugal force, of resistance of the Huid in which it acts, and also of the vibrations of the engine. It is as light as a wooden propeller, and has over the latter the advantage of a greater resistance to shocks when the dimensions are equal. The same hollow light metal propeller in a single piece, can be made from a steel plate or' a plate of any other suitable metal, the variable thiclmess of which, decreasing from a given central line, could be obtained by a rolling or in any other way. This sheet or plate'is afterward shaped by successive passages or stages in suitable matrices, gradually bringing it to the final helical shape. The edges of the plate are in that method of manufacture broughtagainst each other and then soldered, preferably `ytoward the rear edges of the blades of the propeller.

Although this latter meth'od of manufacture is in accordance with the process for building a light hollow metal propeller according to this invention, it 1s preferable to use the method of manufacture in which the said propeller is made from a tube as hereinbefore described.

What I claim as my invention and desire to secure by Letters Patent is l 1. A light hollow 1metallic propeller made of a single piece of metal and comprising at the center openings with stamped out odge receiving a sleeve.

2. A hollow metallic propeller made of a single weldless tube with edges or ends of 'Q v n 1,082,750

a, decreasing cross-section decreasing on both sides of a given central line, said ends being 4formed into helical blades comprising at the' center openings receiving a sleeve.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.


Witnesses: A


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2420424 *Feb 18, 1942May 13, 1947Everel Propeller CorpHub construction
US2502045 *Apr 10, 1946Mar 28, 1950John JohnsonFluid-sustained and fluid-propelled airplane
US2609055 *Nov 8, 1949Sep 2, 1952Hartzell Propeller Fan CompanyReversible propeller blade
US2616511 *Jun 3, 1948Nov 4, 1952Trochoidal Propellers IncTurbo-propeller
US4601639 *Mar 19, 1984Jul 22, 1986Bell Helicopter Textron Inc.Nodalized rotor
U.S. Classification416/232, 416/223.00R, 29/889.6
Cooperative ClassificationF01D5/147