US3567101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of spirally wound pipe
Assignee: Robert Mitchell Co Ltd
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Filing: 1968-02-23
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Granted: 1971-03-02
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Expires: 1988-02-23
Abstract
Abstract Apparatus for forming spirally wound pipes including a cantilever mandrel forming a core having an array of freely rotatable spherical bearings mounted in spaced relation on the periphery thereof to provide a surface on to which a strip of metal is helically fed, and a continuously moving belt forming the strip of metal on the bearings of the mandrel and feeding the formed pipe axially off the mandrel.
Inventors
- 👤 Uno A Ranne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:22
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
Apparatus for continuously forming a spirally wound welded metal pipe, comprising: a frame; a mandrel mounted at one end thereof on the frame; means mounted on the frame to feed a continuous strip of sheet material onto the mandrel at an angle oblique to the line of advancement of the strip; means mounted on the frame to wind the strip helically around the mandrel to form a spiral pipe; means to weld the tube adjacent the point of initial contact of the strip with the mandrel; and means to adjust the mandrel pivotally about an axis transverse to the longitudinal axis thereof and passing through the weld point whereby a uniform relationship between the abutting edges of the seam is maintained.
Claim 2
Dependent Claim
121 words
Apparatus for continuously forming a spirally wound welded metal pipe, comprising: a frame; a mandrel mounted at one end thereof on the frame; means mounted on the frame to feed a continuous strip of sheet material onto the mandrel at an angle oblique to the line of advancement of the strip; means mounted on the frame to wind the strip helically around the mandrel to form a spiral pipe; means to weld the tube adjacent the point of initial contact of the strip with the mandrel; and means to adjust the mandrel pivotally about an axis transverse to the longitudinal axis thereof and passing through the weld point whereby a uniform relationship between the abutting edges of the seam is maintained.
Claim 3
Dependent Claim
38 words
Apparatus as defined in claim 1 in which the mandrel comprises a core having mounted circumferentially thereon an array of freely rotatable bearings adapted to engage the strip in a cylindrical locus in spaced relationship form the core.
Claim 4
Dependent Claim
26 words
Apparatus as defined in claim 1 in which the winding means comprises a belt overlying the strip and helically circumscribing the mandrel at least one turn.
Claim 5
Dependent Claim
38 words
Apparatus as defined in claim 3 in which the feeding means comprises at least one roller having the strip passing tangentially thereagainst, the belt passing over the roller to overlie the strip, and means to drive the roller.
Claim 6
Dependent Claim
12 words
Apparatus as defined in claim 3 in which the belt is endless.
Claim 7
Dependent Claim
21 words
Apparatus as claimed in claim 3 in which the belt comprises a plurality of individual strips of belting in side-by-side relationship.
Claim 8
Dependent Claim
73 words
Apparatus as defined in claim 3 in which the feeding means comprises at least one roller having the strip passing tangentially thereagainst, the belt being continuous and passing over the roller to overlie the strip, the belt being fed off the mandrel onto the a further plurality of rollers to feed back onto said one roller, and means to drive synchronously said one roller with at least one of said plurality of rollers.
Claim 9
Dependent Claim
23 words
Apparatus as defined in claim 7 in which at least one of said rollers is adjustable to vary the tension on the belt.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |