Patent US3871688A successfully refreshed from Google Patents.
US3871688A
Expired / Lapsed
US
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Duct joining means
Assignee: Individual
•
Filing: 1972-12-26
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Granted: 1975-03-18
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Expires: 1992-12-26
Abstract
Abstract Means for joining a sheet metal duct at an opening in a sheet metal panel or wall which includes an elongated sheet metal strip having a U-shaped portion extending longitudinally along the strip, separate flanges projecting from the ends of the legs of the U-shaped portion and a plurality of longitudinally spaced slits through one of the flanges at its junction with its respective leg of the U-shaped portion. The joining member is made by an apparatus which includes a plurality of mating male and female die members which form the U-shaped portion as a sheet metal strip is passed between the die members, and a slitter member for forming the slits in one of the flanges.
Inventors
- 👤 Angelo R Molino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:37
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/12; F16L23/14; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12188; Y10T428/12229; Y10T428/12264; Y10T428/12354
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
In a duct system having a rectangular duct with four sides, each side having a flange and a duct joining member coupling said duct with a body, said duct joining members each comprising an elongated metal strip having an intermediate U-shaped portion with substantially parallel first and second legs and receiving therebetween a respective one of the upstanding flanges at the end of said duct, a first flange extending from the end of the first leg of said U-shaped portion for being positioned over a side at the end of said duct, and a second flange, extending from the end of the second leg of said U-shaped portion received into an opening of said body and being bent for secUring same with said body, said second flanges including means permitting ease of bending thereof.
Claim 2
Dependent Claim
134 words
In a duct system having a rectangular duct with four sides, each side having a flange and a duct joining member coupling said duct with a body, said duct joining members each comprising an elongated metal strip having an intermediate U-shaped portion with substantially parallel first and second legs and receiving therebetween a respective one of the upstanding flanges at the end of said duct, a first flange extending from the end of the first leg of said U-shaped portion for being positioned over a side at the end of said duct, and a second flange, extending from the end of the second leg of said U-shaped portion received into an opening of said body and being bent for secUring same with said body, said second flanges including means permitting ease of bending thereof.
Claim 3
Dependent Claim
34 words
The means in accordance with claim 1 in which the means to permit ease of bending the said second flange of each duct joining member comprises a plurality of slits in said second flange.
Claim 4
Dependent Claim
36 words
The means in accordance with claim 2 in which the slits in the second flange of each duct joining member extend through the said flange along the junction of the said flange and the U-shaped portion.
Claim 5
Dependent Claim
42 words
The means in accordance with claim 3 in which the U-shaped portion of each duct joining member extends longitudinally along the strip and the flanges extend from the U-shaped portion to the side edges of the strip in each duct joining member.
Claim 6
Dependent Claim
19 words
The means in accordance with claim 4 in which the flanges of each duct joining member are substantially co-planar.
References Cited (Backward Citations)
US596817A
Cited
US1925804A
Cited
US2221854A
Cited
US2491700A
Cited
US2965397A
Cited
US3712650A
Cited
US3672707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |