US3910094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming integral coupling flanges in hollow metallic articles
Assignee: Siemens AG
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Filing: 1974-04-05
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Granted: 1975-10-07
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Expires: 1994-04-05
Abstract
Abstract A method and apparatus for forming integral coupling flanges about surface openings in hollow metallic articles. The region of the metallic article about the opening is continuously heated by means of gas burners throughout formation of the flange at a temperature which is suitable for the shaping of the metal of the article. An extruding tool, having a surface layer fabricated of material having a low thermal conduction characteristic, is moved through the surface opening of the metallic article during this heating to form the flange. The gas burners are adapted for heating both the peripheral surface of the article about the opening therein and the flange as it is formed, and the extruding tool may include an intermediate support means which supports and thermally insulates the surface layer of the extruding tool on an inner support element thereof.
Inventors
- 👤 Hans Luttgert
- 👤 Karl Brunk
- 👤 Johannes Dietrich
- 👤 Emanuel Pahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:01
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/28; B21C37/29; B21C37/292; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49446
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
156 words
In a method of forming an integral coupling flange in a hollow metallic article, said article, including a surface opening therein about which said flange is formed, in which said article is heated in the region of said opening to a temperature suitable for the shaping of the metal thereof, and said flange is formed by moving an extruding tool through said opening from the interior of said article the improvement comprising the steps of: continuously heating the metallic article in the region of said opening at said temperature suitable for shaping of the metal thereof throughout the shaping of the metal and formation of the flange, and shaping said metal to form said flange by moving an extruding tool having a low thermal conduction characteristic through said opening whereby the flow of heat drawn from said metal by said tool is minimized thereby facilitating maintaining said temperature in said metal as the same is shaped.
Claim 2
Dependent Claim
156 words
In a method of forming an integral coupling flange in a hollow metallic article, said article, including a surface opening therein about which said flange is formed, in which said article is heated in the region of said opening to a temperature suitable for the shaping of the metal thereof, and said flange is formed by moving an extruding tool through said opening from the interior of said article the improvement comprising the steps of: continuously heating the metallic article in the region of said opening at said temperature suitable for shaping of the metal thereof throughout the shaping of the metal and formation of the flange, and shaping said metal to form said flange by moving an extruding tool having a low thermal conduction characteristic through said opening whereby the flow of heat drawn from said metal by said tool is minimized thereby facilitating maintaining said temperature in said metal as the same is shaped.
Claim 3
Dependent Claim
43 words
The method recited in claim 1, wherein said step of continuously heating includes heating the region about the periphery of said opening prior to moving said extruding tool therethrough, and then heating the flange formed as said tool is moved through said opening.
Claim 4
Dependent Claim
98 words
Apparatus for forming an integral coupling flange in a hollow metallic article, said article including a surface opening therein about which said flange is formed, comprising: gas burner means, adapted so as to be movable to the region of said opening, for heating the article in said region at a temperature suitable for the shaping of the metal thereof; and an extruding tool, movable through said opening outwardly from the interior of said article, for shaping said metal to form said flange, said tool including an outer surface layer formed of material having a low thermal conduction characteristic.
Claim 5
Dependent Claim
98 words
Apparatus for forming an integral coupling flange in a hollow metallic article, said article including a surface opening therein about which said flange is formed, comprising: gas burner means, adapted so as to be movable to the region of said opening, for heating the article in said region at a temperature suitable for the shaping of the metal thereof; and an extruding tool, movable through said opening outwardly from the interior of said article, for shaping said metal to form said flange, said tool including an outer surface layer formed of material having a low thermal conduction characteristic.
Claim 6
Dependent Claim
61 words
The apparatus recited in claim 3, wherein said gas burner means comprises a first curved gas burner having downwardly directed nozzles for heating said region about said opening prior to formation of said flange, and a second curved gas burner having outwardly directed nozzles for heating the flange formed by said extruding tool as said tool is moved through said opening.
Claim 7
Dependent Claim
57 words
The apparatus recited in claim 3, wherein said extruding tool comprises an inner support element, a surface layer disposed thereon fabricated of non-scaling sheet metal having a low thermal conduction characteristic, and intermediate support means, interposed bEtween said inner support element and surface layer, for supporting and thermally insulating said surface layer on said inner support element.
Claim 8
Dependent Claim
15 words
The apparatus recited in claim 5, wherein said intermediate support means comprises thermal insulation material.
Claim 9
Dependent Claim
26 words
The apparatus recited in claim 5, wherein said intermediate support means comprises a plurality of support members disposed on the surface of said inner support element.
Claim 10
Dependent Claim
26 words
The apparatus recited in claim 7, wherein said support members comprise a plurality of interconnected circular wires disposed on the surface of said inner support element.
Claim 11
Dependent Claim
49 words
The apparatus recited in claim 8, wherein said inner support element is conical in shape, and wherein said wires are disposed on the surface of said inner support element along the lines thereof of steepest gradient, and are interconnected so as to form a basket shaped intermediate support element.
Claim 12
Dependent Claim
70 words
The apparatus recited in claim 3, wherein said extruding tool comprises an inner support element and a surface layer disposed thereon fabricated of non-scaling sheet metal having a low thermal conduction characteristic, said inner support element having a plurality of surface grooves disposed therein for forming a support surface for said surface layer which is diminished in area with respect to the total surface area of said inner support element.
Claim 13
Dependent Claim
27 words
The apparatus recited in claim 10, wherein said inner support element is conical in shape and said grooves extend axially along the lines thereof of steepest gradient.
Claim 14
Dependent Claim
24 words
The apparatus recited in claim 10, wherein said inner support element is conical in shape and said grooves extend circumferentially over the surface thereof.
Claim 15
Dependent Claim
25 words
The apparatus recited in claim 3, wherein said extruding tool comprises an inner support element and an outer surface layer of ceramic material disposed thereon.
Claim 16
Dependent Claim
42 words
The apparatus recited in claim 3, wherein said extruding tool includes an upper portion having a shape corresponding to that of said opening in said article, and a lower portion having a shape corresponding to that of the flange to be formed.
Claim 17
Dependent Claim
28 words
The apparatus recited in claim 14, wherein said upper portion and said opening are elliptical in shape, and wherein said lower portion and flange are circular in shape.
Claim 18
Dependent Claim
22 words
The apparatus recited in claim 15, wherein the surface shape of said extruding tool is in the form of a tractrix curve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |