US3715557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of, and apparatus for spirally winding strip metal about a pipe, and securing adjacent strips by welding
Assignee: SA SWEMAT NV CENTRE COMMERICAL DES DAUPHINS 26 AVENUE DES QUATRE SAISONS B-1410 WATERLOO BELGIUM
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Filing: 1971-05-11
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Granted: 1973-02-06
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Expires: 1991-05-11
Abstract
Abstract An annular carrier cage is placed around the pipe, which may be insulated. The carrier cage supports a holder for stainless steel strip, a flange forming apparatus, a flange extension apparatus, seam welding apparatus and a post-welding, flange stress relieving apparatus. To permit curling of the flanged strip about the circumference of the pipe, the flange extension apparatus reduces the diameter of the formed flange adjacent the edge thereof, for example by exerting pressure against the flange strip by a pair of conical rollers having their greater diameter adjacent the free edge of the flange. Adjacent flanges are welded together by roller electrodes, and a pair of conical rollers similar to the flange extension apparatus then bear against the welded joints to relieve stresses due to welding and provide for a tight wrap of the spiral, welded strip about the pipe.
Inventors
- 👤 S Netterstedt
- 👤 B Lindstrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:02
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/08; B23K11/082; B23K11/084; B21; B21C; B21C37/00; B21C37/06; B21C37/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
236 words
Pipe covering apparatus to spirally wind a metal cover band (S) around a pipe (P, 20) comprising an annular cage (10) adapted to be placed around a pipe; a carrier (60, 60'') located on said cage and mounted to rotate with respect to the pipe while travelling lengthwise thereof; a metal strip coil support means (19, 55) secured to said cage (10), for holding a coil (18) of strip metal thereon and permit unwinding of said strip from said coil and spiral winding of said strip on the pipe; flange forming means (21) secured to said cage, for shaping said strip and forming, along its edges, a pair of angled flanges (F); flange extension forming means (30) secured to said cage and operating conjointly with said flange forming means (21) to provide reduction in thickness of the material of the flange (F) towards its outer edges, to curl the flanges and permit winding of the flanged strip about said pipe; seam welding means (40) located at the trailing side of said apparatus and welding the flange of the strip being uncoiled to an adjacent flange of strip uncoiled at a prior revolution of said coil about said pipe; means (11, 12, 13) supporting said cage (10) with respect to said pipe; and means (43, 65) effecting rotation of said cage about said pipe while permitting longitudinal travel of said cage lengthwise, with respect to said pipe.
Claim 2
Dependent Claim
236 words
Pipe covering apparatus to spirally wind a metal cover band (S) around a pipe (P, 20) comprising an annular cage (10) adapted to be placed around a pipe; a carrier (60, 60'') located on said cage and mounted to rotate with respect to the pipe while travelling lengthwise thereof; a metal strip coil support means (19, 55) secured to said cage (10), for holding a coil (18) of strip metal thereon and permit unwinding of said strip from said coil and spiral winding of said strip on the pipe; flange forming means (21) secured to said cage, for shaping said strip and forming, along its edges, a pair of angled flanges (F); flange extension forming means (30) secured to said cage and operating conjointly with said flange forming means (21) to provide reduction in thickness of the material of the flange (F) towards its outer edges, to curl the flanges and permit winding of the flanged strip about said pipe; seam welding means (40) located at the trailing side of said apparatus and welding the flange of the strip being uncoiled to an adjacent flange of strip uncoiled at a prior revolution of said coil about said pipe; means (11, 12, 13) supporting said cage (10) with respect to said pipe; and means (43, 65) effecting rotation of said cage about said pipe while permitting longitudinal travel of said cage lengthwise, with respect to said pipe.
Claim 3
Dependent Claim
236 words
Pipe covering apparatus to spirally wind a metal cover band (S) around a pipe (P, 20) comprising an annular cage (10) adapted to be placed around a pipe; a carrier (60, 60'') located on said cage and mounted to rotate with respect to the pipe while travelling lengthwise thereof; a metal strip coil support means (19, 55) secured to said cage (10), for holding a coil (18) of strip metal thereon and permit unwinding of said strip from said coil and spiral winding of said strip on the pipe; flange forming means (21) secured to said cage, for shaping said strip and forming, along its edges, a pair of angled flanges (F); flange extension forming means (30) secured to said cage and operating conjointly with said flange forming means (21) to provide reduction in thickness of the material of the flange (F) towards its outer edges, to curl the flanges and permit winding of the flanged strip about said pipe; seam welding means (40) located at the trailing side of said apparatus and welding the flange of the strip being uncoiled to an adjacent flange of strip uncoiled at a prior revolution of said coil about said pipe; means (11, 12, 13) supporting said cage (10) with respect to said pipe; and means (43, 65) effecting rotation of said cage about said pipe while permitting longitudinal travel of said cage lengthwise, with respect to said pipe.
Claim 4
Dependent Claim
236 words
Pipe covering apparatus to spirally wind a metal cover band (S) around a pipe (P, 20) comprising an annular cage (10) adapted to be placed around a pipe; a carrier (60, 60'') located on said cage and mounted to rotate with respect to the pipe while travelling lengthwise thereof; a metal strip coil support means (19, 55) secured to said cage (10), for holding a coil (18) of strip metal thereon and permit unwinding of said strip from said coil and spiral winding of said strip on the pipe; flange forming means (21) secured to said cage, for shaping said strip and forming, along its edges, a pair of angled flanges (F); flange extension forming means (30) secured to said cage and operating conjointly with said flange forming means (21) to provide reduction in thickness of the material of the flange (F) towards its outer edges, to curl the flanges and permit winding of the flanged strip about said pipe; seam welding means (40) located at the trailing side of said apparatus and welding the flange of the strip being uncoiled to an adjacent flange of strip uncoiled at a prior revolution of said coil about said pipe; means (11, 12, 13) supporting said cage (10) with respect to said pipe; and means (43, 65) effecting rotation of said cage about said pipe while permitting longitudinal travel of said cage lengthwise, with respect to said pipe.
Claim 5
Dependent Claim
42 words
Apparatus according to claim 1, wherein said seam welding means (40) comprises a pair of rotatable electrodes (41, 42) engaging, each, respective flanges (F1, F2) of the coil being unwound and the strip unwound during a preceding rotation thereof about said pipe.
Claim 6
Dependent Claim
46 words
Apparatus according to claim 2, wherein said seam welding means (40) further comprises motor means (43) secured to said cage and driving the electrodes to effect rotation of said cage about said pipe (P) by engagement of said rotatable electrodes with the flanges of the strip.
Claim 7
Dependent Claim
87 words
Apparatus according to claim 1, including a stress relieving means (50) secured to said cage (10) and located to engage the flanges (F) behind the seam welding means, with respect to the travel of the cage, said stress relieving means (50) comprising means (31, 31'') bearing against the welded flanges and exerting compressive forces thereagainst to relieve stresses arising due to the heat of welding of the flanges and to avoid, or compensate for, distortion of the flanges (F), and hence the strips (S), due to welding.
Claim 8
Dependent Claim
40 words
Apparatus according to claim 4, wherein said stress relieving means (50) comprises a pair of rollers (31, 31''), one roller each bearing against a respective flange (F1, F2); and means (34, 35) pressing said rollers (31, 31'') towards each other.
Claim 9
Dependent Claim
87 words
Apparatus according to claim 1, wherein the flange extension forming means (30) comprises a pair of rollers (31, 31''), one roller each bearing against opposite sides of the flange (F) formed in the flange forming means; and means (34, 35) pressing said rollers towards each other (31, 31'') while exerting higher pressure at the free edges of the flanges than at the roots of the flanges to provide a greater reduction in material thickness at the outer edge, and, hence, curling of the flange about its edges.
Claim 10
Dependent Claim
31 words
Apparatus according to claim 6, wherein said rollers are conical (FIG. 7: 31, 31'') with the greater diameter of the conical region being adjacent the outer edges of the flange (F).
Claim 11
Dependent Claim
52 words
Apparatus according to claim 6, wherein said stress relieving means (50) comprises a pair of rollers (31, 31''), one each bearing against the respective flange (F1, F2); and means (34, 35) pressing said rollers towards each other, said stress relieving means (50) and said flange extension forming means (30) being substantially similar.
Claim 12
Dependent Claim
45 words
Apparatus according to claim 1, wherein said metal strip coil support means comprises a shaft to hold the coil of strip metal thereon and having its axis inclined with respect to the axis of said annular cage to provide for spiral unwinding of the coil.
Claim 13
Dependent Claim
74 words
Apparatus according to claim 1, wherein said metal strip coil support means comprises a plurality of essentially parallel rods arranged to form a coil holding cage and adapted to surround a coil of strip metal and hold said coil within the coil holding cage formed by said rods; said rods having their axes inclined with respect to the axis of said annular cage to provide for spiral unwinding of the strip from the coil.
Claim 14
Dependent Claim
71 words
Apparatus according to claim 1, wherein said flange forming means comprises a plurality of pairs of guide means located adjacent the edges of the strip, one pair of guide means supporting the strip in the major plane of its width and another pair of guide means being located adjacent the edge of the strip and inclined with respect to said major plane to bend said strip and form a bent flange.
Claim 15
Dependent Claim
35 words
Apparatus according to claim 11, wherein said guide means are rollers and a plurality of inclined rollers are provided, located one behind the other, the angle of inclination for successive rollers increasing towards 90* .
Claim 16
Dependent Claim
82 words
Apparatus according to claim 12, wherein at least the last pair of rollers, with respect to the unwinding direction of the metal strip, are conical with the greater diameter of the conical region bearing against the outer edges of the flange to provide for reduction of metal thickness of the outer edges, while forming the last bend to essentially 90* of the flange, and permit curling of the flange about its edge, said last pair of rollers forming said flange extension apparatus.
Claim 17
Dependent Claim
25 words
Apparatus according to claim 1, wherein said annular cage is formed in at least two separable parts to permit lacing said apparatus about a pipe.
Claim 18
Dependent Claim
55 words
Apparatus according to claim 1, wherein the means supporting the cage with respect to the pipe comprises a support structure adapted to be placed about the pipe; rails extending parallel to the pipe; and means mounted on said rails supporting said carrier cage for rotation about said pipe while permitting longitudinal travel along said rails.
Claim 19
Dependent Claim
13 words
Apparatus according to claim 15, wherein said support structure includes a tracked vehicle.
Claim 20
Dependent Claim
46 words
Apparatus according to claim 1, including a guide plate (48) secured to said cage (10) in advance of said seam welding means (40), said guide plate extending toward and engaging a flange (F) of the strip to guide the welding means with respect to the flange.
Claim 21
Dependent Claim
48 words
Apparatus according to claim 17, wherein the guide plate (48) is located to extend between adjacent flanges (FIG. 9: F1, F2) of adjacent strips, and means (47R) are provided to press the flanges together and guide them aligned and adjacent each other to the seam welding means (40).
Claim 22
Dependent Claim
16 words
Apparatus according to claim 1, wherein the carrier is an annular cage concentric with said cage.
Claim 23
Dependent Claim
19 words
Apparatus according to claim 1, wherein the carrier (60, 60'') is a platform movably mounted on said cage (10).
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |