US2022562A - Propeller - Google Patents
Propeller Download PDFInfo
- Publication number
- US2022562A US2022562A US742339A US74233934A US2022562A US 2022562 A US2022562 A US 2022562A US 742339 A US742339 A US 742339A US 74233934 A US74233934 A US 74233934A US 2022562 A US2022562 A US 2022562A
- Authority
- US
- United States
- Prior art keywords
- metal
- propeller
- fabric
- wood
- blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 description 27
- 239000002184 metal Substances 0.000 description 27
- 239000004744 fabric Substances 0.000 description 17
- 239000002023 wood Substances 0.000 description 14
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 230000000149 penetrating effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 3
- 239000011253 protective coating Substances 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000007101 Muscle Cramp Diseases 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/16—Blades
- B64C11/20—Constructional features
- B64C11/205—Constructional features for protecting blades, e.g. coating
Definitions
- This invention relates to a process of sheathing a propeller blade of wood, and to a sheathed propeller produced by said process.
- the protective metal sheath adheres as a whole to the propeller to be protected, as not the wire fabric but ,the sprayed-on metallic coating comes directly in contact with the wood. Further, the protective metallic coating has such a hold that the wire fabric cannot come away from the propeller notwithstanding the different coefllcients 5 of expansion of wood and metal.
- the metal fabric can be readily and easily stretched on and adapted to the blade form, so that a tightly fitting envelope is provided.
- FIG. 1 is a transverse section of a blade of a propeller according to the invention.
- Fig. 2 is a detail view to a larger scale.
- the propeller blade proper is preferably formed of plies a of wood, in which the grain is oppositely directed in adjoining plies, as in multipleply wood.
- the process of applying the protective covering is performed as follows:--first, metal, for example, light metal, is sprayed in a thin metal base layer b over the entire propeller blade, the metal penetrating more or less deeply into the wood; then an envelope 0 of metal fabric is stretched over the entire surface of the blade,
- the fabric penetrating more or less deeply into 251- bedded the whole is ground to the exact blade form and polished. Any reasonably light metal is satisfactory for both the base and fabric envelope.
- the envelope 0 has sufiicient tensile strength to give a firm hold to the covering and to impart sufiicient capacity for resistance to changes of temperature. It is preferably fixedly connected with the propeller by means of cramps or other fastening means, whereby the correct seating of the fabric after its stretching over the wooden blade is ensured.
- a process of sheathing a propeller blade of wood consisting in first spraying a metal base layer on to the blade, then fixing to the blade an envelope of wire mesh fabric covering the entire surface of the blade, then spraying on a coating covering said envelope and penetrating the meshes of said envelope up to said metal base penetrating said envelope up to the metal base layer.
- a sheathed propeller of wood comprising wooden blades, 9. base layer of metal adhering to the wood, envelopes applied to said blades and covering the entire surface thereof, an outer coating of metal covering said envelope and penetrating said envelope up to the metal base layer, and fastening means aiding in securing the envelopes to the propeller.
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Coating By Spraying Or Casting (AREA)
Description
Nov. 26, 1935. o u p -r 2,922,562
PROPELLER Filed Aug. 31, 1934 Patented Nov. 26, 1935 UNITED STATES PATENT OFFICE Germany, assignor to the firm Grumpelt Propellerbau Gesellschaft mit bcschri'tnkter Haftung, Flughal'en, Hamburg, Germany Application August 31, 1934, Serial No. 742,339
In Germany October 13, 1930 3 Claims.
This invention relates to a process of sheathing a propeller blade of wood, and to a sheathed propeller produced by said process.
It has previously been proposed to cover certain parts of a propeller, particularly the edges of the blades, with a protective coating of metal,
In this connection metal layers of different kinds ing.
Further, it has been proposed to provide for air screws protective coatings composed of metal wire. fabric. -In the case where smoothing of the surface of the wire fabric was required, the meshes of the fabric were filled in, for example, by inserting metal or artificial masses, by pressing, spraying, soldering or the like, into the meshes.
These known arrangements are open to the objection that with the direct application of the wire fabric to the wood and subsequent spray-' ing of the metal coating through the fabric it is not possible to obtain an entirely homogeneous covering. Further, these arrangements do not offer sufficient protection against moisture. In consequence of the different coeflicients of expansion of wood and metal, the metal fabric does not cling sufficiently closely to the surface of the wood, so that fissures and crevices are produced between the wood and the wire fabric, which fissures are in part attributable to the evaporation of moisture, and in part to the formation of cracks, etc., in the metal mass subsequently pressed in or sprayed. If a crack is formed in the outer metal covering produced according to the methods heretofore known, moisture penetrates beneath this crack and spreads beneath the metal covering and so leads to rotting of the wood structure of the propeller.
These drawbacks are overcome by the present 'invention which consists in first spraying a metal base layer on to the wooden blade, then applying thereto and fixing an envelope of wire fabric covering the entire surface of the blade, then spraying on a coating covering the fabric envelope and penetrating the same up to the metal base layer, and then grinding the whole to the exact blade form.
In this way there is obtained the result that the protective metal sheath adheres as a whole to the propeller to be protected, as not the wire fabric but ,the sprayed-on metallic coating comes directly in contact with the wood. Further, the protective metallic coating has such a hold that the wire fabric cannot come away from the propeller notwithstanding the different coefllcients 5 of expansion of wood and metal.
The metal fabric can be readily and easily stretched on and adapted to the blade form, so that a tightly fitting envelope is provided.
In the accompanying drawing Fig. 1 is a transverse section of a blade of a propeller according to the invention. Fig. 2 is a detail view to a larger scale.
The propeller blade proper is preferably formed of plies a of wood, in which the grain is oppositely directed in adjoining plies, as in multipleply wood.
The process of applying the protective covering is performed as follows:--first, metal, for example, light metal, is sprayed in a thin metal base layer b over the entire propeller blade, the metal penetrating more or less deeply into the wood; then an envelope 0 of metal fabric is stretched over the entire surface of the blade,
the fabric penetrating more or less deeply into 251- bedded, the whole is ground to the exact blade form and polished. Any reasonably light metal is satisfactory for both the base and fabric envelope. For example, I can use with success the zinc, bronze, copper or aluminum, or other suitable material, suggested at page 1, lines 95-97 of the U. S. patent to Luense, #1,261,141.
The envelope 0 has sufiicient tensile strength to give a firm hold to the covering and to impart sufiicient capacity for resistance to changes of temperature. It is preferably fixedly connected with the propeller by means of cramps or other fastening means, whereby the correct seating of the fabric after its stretching over the wooden blade is ensured.
I claim:
1. A process of sheathing a propeller blade of wood consisting in first spraying a metal base layer on to the blade, then fixing to the blade an envelope of wire mesh fabric covering the entire surface of the blade, then spraying on a coating covering said envelope and penetrating the meshes of said envelope up to said metal base penetrating said envelope up to the metal base layer.
3. A sheathed propeller of wood comprising wooden blades, 9. base layer of metal adhering to the wood, envelopes applied to said blades and covering the entire surface thereof, an outer coating of metal covering said envelope and penetrating said envelope up to the metal base layer, and fastening means aiding in securing the envelopes to the propeller.
OSKAR FRITZ AMANDUS EMIL GRUMPELT.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2022562X | 1930-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2022562A true US2022562A (en) | 1935-11-26 |
Family
ID=7978446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US742339A Expired - Lifetime US2022562A (en) | 1930-10-13 | 1934-08-31 | Propeller |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2022562A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4040159A (en) * | 1975-10-29 | 1977-08-09 | General Electric Company | Method of manufacture of cooled airfoil-shaped bucket |
-
1934
- 1934-08-31 US US742339A patent/US2022562A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4040159A (en) * | 1975-10-29 | 1977-08-09 | General Electric Company | Method of manufacture of cooled airfoil-shaped bucket |
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