|Publication number||US1082750 A|
|Publication date||Dec 30, 1913|
|Filing date||Aug 12, 1912|
|Priority date||Aug 12, 1912|
|Publication number||US 1082750 A, US 1082750A, US-A-1082750, US1082750 A, US1082750A|
|Original Assignee||Pierre Jacomy|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (5), Classifications (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
awa/gt RJAooMYf METALLIC ynoPLLn. l APPLICATION FILED AUG.12,' 1912.,
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@ TTED S PIERRE JACOMY, F ASNIRES, FRANCE.
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.
VICTOR DUPONT, H. C. CoXE.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US2420424 *||Feb 18, 1942||May 13, 1947||Everel Propeller Corp||Hub construction|
|US2502045 *||Apr 10, 1946||Mar 28, 1950||John Johnson||Fluid-sustained and fluid-propelled airplane|
|US2609055 *||Nov 8, 1949||Sep 2, 1952||Hartzell Propeller Fan Company||Reversible propeller blade|
|US2616511 *||Jun 3, 1948||Nov 4, 1952||Trochoidal Propellers Inc||Turbo-propeller|
|US4601639 *||Mar 19, 1984||Jul 22, 1986||Bell Helicopter Textron Inc.||Nodalized rotor|
|U.S. Classification||416/232, 416/223.00R, 29/889.6|