US3776449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding machine for connecting tubes to a wall
Assignee: Goetaverken AB
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Filing: 1972-06-12
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Granted: 1973-12-04
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Expires: 1992-06-12
Abstract
Abstract When fitting a large number of parallel tubes to the end plate of a heat exchanger in which each individual tube is pushed through a nipple in the end plate and reaches a considerable distance into the heat exchanger, certain difficulties are encountered in performing a satisfactory welding joint between the tube and the nipple. The space available is often limited and manual or even automatic welding by conventional machines is practically impossible. The disclosure proposes a machine which can easily be fitted around the tube, to be carried thereby and retained by simple means in the proper position adjacent to the part of the tube to be welded. The machine includes a welding torch and means for rotating the same around the tube.
Inventors
- 👤 N Jungle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:38
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/02; B23K9/028; B23K9/0288; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
230 words
In a welding machine, including at least one welding torch, for connecting a tube to a nipple extending outwards from a wall in a device where there is limited space available around the nipple and the tube is so long that no guiding of the machine by means of members co-operating with the inside of the tube can be arranged, the combination of a carrier in the form of a closed cylindrical element providing a longitudinal passage having an internal diameter greater than is the external diameter of said tube, said passage thus enclosing the tube with a clearance; two annular members each having a wedge-shaped cross-section, the internal diameter of the annular members corresponding to the external diameter of the tube, said annular members being designed to be mounted on the tube with the narrow ends of the wedge-shaped cross-section turned towards each other and to be forced into the passage in the carrier from opposite ends thereof; two external toothed rings disposed at opposite ends of the carrier, at least two external annular guides on the carrier intermediate the toothed rings, a sleeve running on said annular guides and carrying said welding torch; and driving means including a driving motor and associated gear transmission which driving means is mounted on said sleeve and co-operates with the toothed rings on the carrier to rotate said sleeve about the tUbe.
Claim 2
Dependent Claim
230 words
In a welding machine, including at least one welding torch, for connecting a tube to a nipple extending outwards from a wall in a device where there is limited space available around the nipple and the tube is so long that no guiding of the machine by means of members co-operating with the inside of the tube can be arranged, the combination of a carrier in the form of a closed cylindrical element providing a longitudinal passage having an internal diameter greater than is the external diameter of said tube, said passage thus enclosing the tube with a clearance; two annular members each having a wedge-shaped cross-section, the internal diameter of the annular members corresponding to the external diameter of the tube, said annular members being designed to be mounted on the tube with the narrow ends of the wedge-shaped cross-section turned towards each other and to be forced into the passage in the carrier from opposite ends thereof; two external toothed rings disposed at opposite ends of the carrier, at least two external annular guides on the carrier intermediate the toothed rings, a sleeve running on said annular guides and carrying said welding torch; and driving means including a driving motor and associated gear transmission which driving means is mounted on said sleeve and co-operates with the toothed rings on the carrier to rotate said sleeve about the tUbe.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |