Patent US3572074A successfully refreshed from Google Patents.
US3572074A
Expired / Lapsed
US
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Corrugating methods and apparatus
Assignee: Prysmian Cables and Systems Ltd
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Filing: 1969-01-03
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Granted: 1971-03-23
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Expires: 1989-01-03
Abstract
Abstract For producing annular corrugations in metal tubing, such as an electric cable sheath, an apparatus is disclosed which includes an annular corrugating member having a helical-working ridge on its inner circumference and mounted so as to encircle the tubing eccentrically with the working ridge bearing against the tubing. The corrugating member is mounted for free rotation in its own plane within a head which is itself rotatable about the tubing axis so as to move the geometric center of the corrugating member in a circle around the tubing axis. The working ridge bears against successive portions of the tubing to form annular corrugations as the head is rotated and the tubing is moved through the corrugating member.
Inventors
- 👤 Henry William Holdup
- 👤 John Alfred Baskwell
- 👤 Reginald Henry Lush
- 👤 James Arthur Francis Donelan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:22
CPC Classifications
B; B21; B21D; B21D15/00; B21D15/04; H; H01; H01B; H01B13/00; H01B13/0009
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
Apparatus for forming annular corrugations in metal tubing, which comprises means for supporting metal tubing whilst permitting its axial movement, an annular corrugating member, a helical-working ridge formed on the inner surface of the annular corrugating member, a head in which the annular corrugating member is mounted so as to be freely rotatable in its own plane about its geometric center, means in which the head is mounted with the annular corrugating member encircling the tubing with its geometric center displaced from the tubing axis so that the helical-working ridge bears against the tubing and means for rotating the head so that the geometric center of the annular corrugating member moves around the tubing in a circular path in a plane perpendicular to the tubing axis whilst the tubing moves axially through the annular corrugating member and so that successive portions of the working ridge bear against successive circumferential portions of the tubing in planes perpendicular to the tubing axis to form annular corrugations in the tubing.
Claim 2
Dependent Claim
167 words
Apparatus for forming annular corrugations in metal tubing, which comprises means for supporting metal tubing whilst permitting its axial movement, an annular corrugating member, a helical-working ridge formed on the inner surface of the annular corrugating member, a head in which the annular corrugating member is mounted so as to be freely rotatable in its own plane about its geometric center, means in which the head is mounted with the annular corrugating member encircling the tubing with its geometric center displaced from the tubing axis so that the helical-working ridge bears against the tubing and means for rotating the head so that the geometric center of the annular corrugating member moves around the tubing in a circular path in a plane perpendicular to the tubing axis whilst the tubing moves axially through the annular corrugating member and so that successive portions of the working ridge bear against successive circumferential portions of the tubing in planes perpendicular to the tubing axis to form annular corrugations in the tubing.
Claim 3
Dependent Claim
101 words
Apparatus according to claim 1 in which the annular corrugating member is so mounted in the head that its plane is inclined to the tubing axis but is parallel to the direction in which the geometric center of the annular corrugating member is displaced from the tubing axis, the angle of inclination of the plane of the annular corrugating member to the tubing axis being such that, said movement of the annular corrugating member induces axial movement of the tubing at the required rate relative to the rate of said movement of the annular corrugating member for forming said annular corrugations.
Claim 4
Dependent Claim
24 words
Apparatus according to claim 2 in which said angle of inclination is equal to or greater than the pitch angle of the helical-working ridge.
Claim 5
Dependent Claim
19 words
Apparatus according to claim 3 in which said angle of inclination is within the range of 4* to 8*.
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |