US3909580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for welding aligned sheet metal plates together for forming a band for making spiral seam tubes
Assignee: Blohm and Voss GmbH
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Filing: 1973-02-20
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Granted: 1975-09-30
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Expires: 1993-02-20
Abstract
Abstract A continuous band for use in making spiral seam tubes is made by horizontally aligning sheet metal plates in a common horizontal plane and clamping each adjacent end of the plates separately. A milling cutter is introduced in a slot formed between the adjacent transverse edges of these plates to trim and chamfer these two transverse edges simultaneously. Thereupon at least one of the clamping devices for clamping one of the plates is moved toward the other clamping device holding the other plate so that a welding joint is formed between the two transverse edges, which are then welded together.
Inventors
- 👤 Heinz Krakow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:51
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/02; B23K9/025; B21; B21C; B21C37/00; B21C37/06; B21C37/12; B21C37/126; B23K9/032; B23K9/0325; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/306664
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
Method for producing transverse welds in aligned sheet metal plates to produce a band from which spiral seam tubes are made, comprising the steps of aligning two sheet metal ends with their longitudinal edges, clamping each of said ends separately with their transverse edges spaced from one another securing the plates in a clamped position in A common horizontal plane relative to one another, contemporaneously trimming and chamfering said transverse edges at opposite sides by a milling head while said plates are in said clamped position, moving said ends by a slidable parallel movement toward each other to form a welding joint between the same, welding said ends together, and then releasing said clamping.
Claim 2
Dependent Claim
114 words
Method for producing transverse welds in aligned sheet metal plates to produce a band from which spiral seam tubes are made, comprising the steps of aligning two sheet metal ends with their longitudinal edges, clamping each of said ends separately with their transverse edges spaced from one another securing the plates in a clamped position in A common horizontal plane relative to one another, contemporaneously trimming and chamfering said transverse edges at opposite sides by a milling head while said plates are in said clamped position, moving said ends by a slidable parallel movement toward each other to form a welding joint between the same, welding said ends together, and then releasing said clamping.
Claim 3
Dependent Claim
15 words
Method according to claim 1, in which both transverse edges are trimmed and chamfered simultaneously.
Claim 4
Dependent Claim
117 words
Method for producing transverse welds in aligned sheet metal plates to produce a band from which spiral seam tubes are made, comprising the steps of aligning two sheet metal ends with their longitudinal edges in opposed relation, clamping each of said ends separately with their transverse edges spaced from one another securing the plates in a clamped position in a common horizontal plane relative to one another, contemporaneously trimming and chamfering said transverse edges at opposite sides by a milling head while said plates are in said clamped position, moving said ends by a slidable parallel movement toward each other to form a welding joint between the same, welding said ends together, and then releasing said clamping.
Claim 5
Dependent Claim
117 words
Method for producing transverse welds in aligned sheet metal plates to produce a band from which spiral seam tubes are made, comprising the steps of aligning two sheet metal ends with their longitudinal edges in opposed relation, clamping each of said ends separately with their transverse edges spaced from one another securing the plates in a clamped position in a common horizontal plane relative to one another, contemporaneously trimming and chamfering said transverse edges at opposite sides by a milling head while said plates are in said clamped position, moving said ends by a slidable parallel movement toward each other to form a welding joint between the same, welding said ends together, and then releasing said clamping.
Claim 6
Dependent Claim
28 words
The method of claim 3, in which both transverse edges are trimmed and chamfered simultaneously by a single milling head which operates simultaneously on said two transverse edges.
Claim 7
Dependent Claim
17 words
The method of claim 4 where the trimming and chamfering operation operates to form a V-shaped joint.
Claim 8
Dependent Claim
26 words
The method of claim 3 where the welding step occurs while the plates are held stationary as the welding progressively occurs along the rectangular welding joints.
References Cited (Backward Citations)
US981695A
Cited
US2265129A
Cited
US2558360A
Cited
US3257060A
Cited
US3307764A
Cited
US3426952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |