Patent US3740995A successfully refreshed from Google Patents.
US3740995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for bending a gutter or equivalent into a curve
Assignee: Individual
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Filing: 1971-06-30
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Granted: 1973-06-26
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Expires: 1991-06-30
Abstract
Abstract The bending of a gutter or equivalent article of sheet metal by bending a small portion at a time between cooperating die elements which when placed in operative relationship, provide a space substantially equal to the thickness of the sheet metal, with the longitudinal and transverse cross section of the article to be bent. The edge surfaces of the article are subjected to pressure exerted by the die elements while the unbent portion of the article immediately before the die elements is supported from inside and outside by retaining means corresponding to the unbent article.
Inventors
- 👤 H Fredriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:48
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/08; B21D7/085
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A method for bending a gutter and like article of sheet metal a small portion at a time, comprising the steps of placing together die elements defining therebetween a space substantially equal to the thickness of the sheet metal introduced therein, the space having longitudinal and transverse cross sections corresponding to the bending radius and the cross section of the article to be bent, and supporting the unbent portion of the article from inside and outside by retaining means immediately before the die elements while subjecting the edge surfaces of the article to be bent by pressure exerted by the die elements.
Claim 2
Independent Claim
102 words
A method for bending a gutter and like article of sheet metal a small portion at a time, comprising the steps of placing together die elements defining therebetween a space substantially equal to the thickness of the sheet metal introduced therein, the space having longitudinal and transverse cross sections corresponding to the bending radius and the cross section of the article to be bent, and supporting the unbent portion of the article from inside and outside by retaining means immediately before the die elements while subjecting the edge surfaces of the article to be bent by pressure exerted by the die elements.
Claim 3
Independent Claim
118 words
A device for bending a gutter and like article of sheet metal a small portion at a time, comprising cooperating die elements, said die elements having surfaces corresponding to the bending radius and cross section of the article to be bent when positioned in operative relationship, the surface of the die element supporting the inside surface of the article being provided with projecting parts pressing against the side surfaces of the article to be bent, the projecting parts having a width corresponding to the thickness of the sheet metal to be bent, and retaining means located immediately before the cooperating die elements, the retaining means being provided with supporting surfaces corresponding to the unbent profile of the article.
Claim 4
Independent Claim
118 words
A device for bending a gutter and like article of sheet metal a small portion at a time, comprising cooperating die elements, said die elements having surfaces corresponding to the bending radius and cross section of the article to be bent when positioned in operative relationship, the surface of the die element supporting the inside surface of the article being provided with projecting parts pressing against the side surfaces of the article to be bent, the projecting parts having a width corresponding to the thickness of the sheet metal to be bent, and retaining means located immediately before the cooperating die elements, the retaining means being provided with supporting surfaces corresponding to the unbent profile of the article.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |