Patent US4289168A successfully refreshed from Google Patents.
US4289168A
Expired / Lapsed
US
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Method for making pipe of fabric impregnated with resin
Assignee: Airbus Group SAS
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Filing: 1979-09-17
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Granted: 1981-09-15
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Expires: 1999-09-17
Abstract
Abstract The invention is a method for the manufacture of hollow bodies, particularly pipes, from fabric reinforced resin by forming a coil of fabric impregnated with resin, which is dried, preheated, and introduced into a preheated mold. The coil is pressed axially into the mold between a preheated borer defining the interior shape of the pipe, and a sleeve, and the resin impregnated in the fabric is polymerized. The product is useful in the manufacture of nozzles for missiles or the like.
Inventors
- 👤 Guy B. E. Lecourt
- 👤 Claude L. L. Portalier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:09
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/26; F16L47/265; Y; Y10; Y10S; Y10S239/00; Y10S239/19
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
A method for making a tubular hollow body from fabric impregnated with a thermosetting resin, comprising: forming a coil of dry, thermosetting resin impregnated fabric, inserting the coil into a hollow mold having two open ends, inserting a preheated mandrel into the coil through a first of said open ends, said mandrel having a conical portion and a cylindrical portion, causing turns of the coil to shift axially and form a conical shape larger than said coil as initially inserted in said mold, inserting a presser sleeve into the mold through the second open end, said sleeve surrounding said cylindrical portion and cooperating with said mandrel and said hollow mold to exert pressure on said coil and to shape said coil while maintaining the temperature of the coil above the softening point of the resin but below a temperature at which significant further polymerization will occur, and then further polymerizing said resin.
Claim 2
Independent Claim
152 words
A method for making a tubular hollow body from fabric impregnated with a thermosetting resin, comprising: forming a coil of dry, thermosetting resin impregnated fabric, inserting the coil into a hollow mold having two open ends, inserting a preheated mandrel into the coil through a first of said open ends, said mandrel having a conical portion and a cylindrical portion, causing turns of the coil to shift axially and form a conical shape larger than said coil as initially inserted in said mold, inserting a presser sleeve into the mold through the second open end, said sleeve surrounding said cylindrical portion and cooperating with said mandrel and said hollow mold to exert pressure on said coil and to shape said coil while maintaining the temperature of the coil above the softening point of the resin but below a temperature at which significant further polymerization will occur, and then further polymerizing said resin.
Claim 3
Dependent Claim
26 words
A method according to claim 1 wherein the axial thrusts are applied successively, the thrust on the sleeve being applied after the thrust on the mandrel.
Claim 4
Dependent Claim
29 words
A method according to claim 1 or 2, wherein the thrust on the mandrel is stronger than the thrust on the sleeve and is sufficient to oppose the latter.
Claim 5
Dependent Claim
25 words
A method according to claim 1 or 2, wherein the coil is preheated to a temperature close to the softening point of the impregnation resin.
Claim 6
Dependent Claim
27 words
A method according to claim 1 or 2, wherein the mandrel and the mold are preheated to a temperature close to the melting point of the resin.
Claim 7
Dependent Claim
22 words
A method according to claim 1 or 2, wherein the coil is introduced at the upper end of the mold disposed vertically.
Claim 8
Dependent Claim
53 words
A method according to claim 1 or 2, wherein the inner surface of the mold and the outer surface of the mandrel have conjugated conical parts, and the coil, under the thrust of the mandrel, forms a cone, the turns of the coil shifting relative to each other to assume a spiral configuration.
Claim 9
Dependent Claim
32 words
A method according to claim 7, wherein the coil, in the form of a spiral, lines an insert prepositioned in the mold, with which said insert the conical coil forms one piece.
Claim 10
Dependent Claim
13 words
A pipe produced by the method of claim 1 or 2 or 7.
Claim 11
Dependent Claim
12 words
A nozzle obtained by the method according to claim 7 or 8.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |