US3879994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plate rolling
Assignee: Individual
•
Filing: 1973-08-16
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Granted: 1975-04-29
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Expires: 1993-08-16
Abstract
Abstract Steel plate is rolled by engaging an edge of the plate under a flange of a rib extending axially on the cylindrical surface of a mandrel. The mandrel is turned to advance and curve the plate. Complete pipes are formed by curving plate about the mandrel through 180* then engaging the opposite edge of the plate with the mandrel and curving the remaining 180*.
Inventors
- 👤 Kenneth Michael Hume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:22
CPC Classifications
B; B21; B21D; B21D5/00; B21D5/14; B21D5/143; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/0815
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A method of rolling plate to form a cylindrical article which comprises gripping a leading edge of a length of plate with a mandrel so that the plate is tangential to the mandrel from the said edge, rotating the mandrel which engaging the remainder of the plate against the mandrel by pressure means to move the plate to curve a forward part of the plate about the mandrel into a semi-cylindrical shape, subsequently further advancing the plate until the rearward part of the plate and its trailing edge pass beyond contact with the mandrel, and then gripping the said trailing edge with the mandrel and turning the mandrel again to curve the rearward part of the plate about the mandrel into a semi-cylindrical shape so that said forward and rearward parts together complete the formation of a cylinder.
Claim 2
Independent Claim
138 words
A method of rolling plate to form a cylindrical article which comprises gripping a leading edge of a length of plate with a mandrel so that the plate is tangential to the mandrel from the said edge, rotating the mandrel which engaging the remainder of the plate against the mandrel by pressure means to move the plate to curve a forward part of the plate about the mandrel into a semi-cylindrical shape, subsequently further advancing the plate until the rearward part of the plate and its trailing edge pass beyond contact with the mandrel, and then gripping the said trailing edge with the mandrel and turning the mandrel again to curve the rearward part of the plate about the mandrel into a semi-cylindrical shape so that said forward and rearward parts together complete the formation of a cylinder.
Claim 3
Dependent Claim
38 words
A method according to claim 1 whicH includes forming each semi-cylindrical shape by turning the mandrel beyond 180* and thereafter releasing the mandrel and allowing the curved part of the plate to spring back to a semi-cylindrical shape.
Claim 4
Dependent Claim
47 words
A method according to claim 1 in which the engagement of the said trailing edge is effected by reversing the direction of motion of the plate, and wherein the mandrel is then rotated in the reverse direction to that used in the initial curving of the plate.
Claim 5
Dependent Claim
38 words
A method according to claim 1, wherein the gripping step includes gripping the leading edge of the plate with a rib which projects radially outwardly from the mandrel and extends axially therealong and includes a circumferentially extending flange.
Claim 6
Dependent Claim
89 words
A method according to claim 4, in which the engagement of said trailing edge is effected by reversing the direction of motion of the plate and wherein the mandrel is rotated in the reverse direction to that used in the initial curving of the plate while curving the said rearward portion of the plate, and wherein said rib flanges extend in both circumferential directions and both of said gripping steps include gripping with one or the other of recesses formed by the circumferentially extending flanges on the projecting rib.
Claim 7
Independent Claim
118 words
An apparatus for rolling plate to form a cylindrical article comprising a mandrel of cylindrical configuration having a rib extending radially outwardly from the periphery of the mandrel and extending in an axial direction for gripping the edge of a plate with the mandrel and the plate extending longitudinally to the mandrel from the said edge, and pressure means for exerting pressure against the surface of the plate to urge the plate against the mandrel, said rib having two circumferentially directed flanges, one extending to each side, each flange defining a recesses into which an edge of the plate can be placed to be gripped, and including means for driving the mandrel about is axis in both directions.
Claim 8
Independent Claim
118 words
An apparatus for rolling plate to form a cylindrical article comprising a mandrel of cylindrical configuration having a rib extending radially outwardly from the periphery of the mandrel and extending in an axial direction for gripping the edge of a plate with the mandrel and the plate extending longitudinally to the mandrel from the said edge, and pressure means for exerting pressure against the surface of the plate to urge the plate against the mandrel, said rib having two circumferentially directed flanges, one extending to each side, each flange defining a recesses into which an edge of the plate can be placed to be gripped, and including means for driving the mandrel about is axis in both directions.
Claim 9
Dependent Claim
42 words
Apparatus according to claim 6 wherein the mandrel is provided with bearing means capable of being raised and lowered and wherein the bearing means at one end can be disengaged to enable a formed cylindrical article to be removed from the mandrel.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |