US3881338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bending a metal sheet and a corner produced thereby
Assignee: ROBERTSON-CECO Corp A DE CORP
•
Filing: 1973-08-16
•
Granted: 1975-05-06
•
Expires: 1993-08-16
Abstract
Abstract A method for bending a metal sheet along a selected line to provide a smooth bending edge. The metal sheet is indented along the selected line to produce a groove in one face and a bead in the opposite face. The metal sheet is then shaped into sections having a common bending edge coincident with the selected line and such that the inside of the bending edge is formed by the bead and the outside of the bending edge is formed by the groove.
Inventors
- 👤 Walter Tischuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:28
CPC Classifications
B; B21; B21D; B21D5/00; B21D11/00; B21D11/20; Y; Y10; Y10S; Y10S29/00; Y10S29/033; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
128 words
A method of bending a building panel along a selected line, comprising providing a metal facing sheet having an exposed face and a hidden face; indenting said facing sheet along said selected line to produce a groove in said exposed face and a complementing bead in said hidden face; applying a backing to substantially the entire area of said hidden face; notching said backing to provide a V-groove having an apex proximate to and parallel with said complementing bead; and bending said building panel about said selected line to provide angularly presented panel segments having a common bending edge and such that the inside of said common bending edge is formed from said complementing bead and the outside of said common bending edge is formed from said groove.
Claim 2
Independent Claim
128 words
A method of bending a building panel along a selected line, comprising providing a metal facing sheet having an exposed face and a hidden face; indenting said facing sheet along said selected line to produce a groove in said exposed face and a complementing bead in said hidden face; applying a backing to substantially the entire area of said hidden face; notching said backing to provide a V-groove having an apex proximate to and parallel with said complementing bead; and bending said building panel about said selected line to provide angularly presented panel segments having a common bending edge and such that the inside of said common bending edge is formed from said complementing bead and the outside of said common bending edge is formed from said groove.
Claim 3
Dependent Claim
31 words
The method of claim 1 including the step of applying a brittle decorative coating to said exposed face of said facing sheet after indenting but prior to bending said building panel.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said backing comprises a foamed plastics composition.
Claim 5
Dependent Claim
48 words
The method of claim 1 wherein said backing comprises a slab of foamed plastics composition having one face secured to said hidden face of said facing sheet and an opposite face; and an inner skin substantially coextensive with said opposite face of said block of foam plastics composition.
Claim 6
Independent Claim
229 words
A method of bEnding a laminated building panel along a first selected line to provide an outside corner and along a second selected line spaced from said first selected line to provide an inside corner, comprising providing a metal facing sheet having an exposed face and a hidden face; indenting said facing sheet along each said line to produce a groove in said exposed face and a complementing bead in said hidden face. applying a backing over substantially the entire area of said hidden face; notching said backing to provide a V-groove having an apex proximate to and parallel with the complementary bead of said first selected line; cutting through said backing in a direction parallel with said second selected line to the complementing bead of said second selected line; bending said building panel about said first selected line to provide angularly presented panel segments having a common bending edge and such that the inside of said common bending edge is formed from said complementing bead and the outside of said common bending edge is formed from said groove; and bending said building panel about said second selected line to provide angularly presented panel segments having a common bending edge and such that the inside of said common bending edge is formed from said groove and the outside of said common bending edge is formed from said complementing bead.
Claim 7
Independent Claim
229 words
A method of bEnding a laminated building panel along a first selected line to provide an outside corner and along a second selected line spaced from said first selected line to provide an inside corner, comprising providing a metal facing sheet having an exposed face and a hidden face; indenting said facing sheet along each said line to produce a groove in said exposed face and a complementing bead in said hidden face. applying a backing over substantially the entire area of said hidden face; notching said backing to provide a V-groove having an apex proximate to and parallel with the complementary bead of said first selected line; cutting through said backing in a direction parallel with said second selected line to the complementing bead of said second selected line; bending said building panel about said first selected line to provide angularly presented panel segments having a common bending edge and such that the inside of said common bending edge is formed from said complementing bead and the outside of said common bending edge is formed from said groove; and bending said building panel about said second selected line to provide angularly presented panel segments having a common bending edge and such that the inside of said common bending edge is formed from said groove and the outside of said common bending edge is formed from said complementing bead.
Claim 8
Dependent Claim
57 words
The method of claim 1 wherein prior to bending said building panel, the surface of said groove in said facing sheet consists of a concave arc segment having opposite edges; and convex arc segments, each providing a smooth transition between one of said edges of said concave arc segment and said exposed face of said facing sheet.
Claim 9
Dependent Claim
26 words
The method of claim 6 wherein each of said convex arc segments is formed with a radius equal to the radius of said common bending edge.
Claim 10
Dependent Claim
22 words
The method of claim 1 wherein the girth of said groove is substantially equal to the girth of said common bending edge.
References Cited (Backward Citations)
US944536A
Cited
US918366A
Cited
US1992835A
Cited
US2728479A
Cited
US3175655A
Cited
US3376670A
Cited
US3465424A
Cited
US3478483A
Cited
US3667180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |