US3757830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectangular air duct
Assignee: LASALLE-DEITCH Co Inc
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Filing: 1971-07-19
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Granted: 1973-09-11
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Expires: 1991-07-19
Abstract
Abstract A machine designed to continuously progress a pair of elongated flat sheets of metal longitudinally through a plurality of cooperative dies which progressively in sequential steps gradually shape the two sheets into a duct having a rectangular cross-sectional configuration. The machine utilizes cooperative rotary dies to shape and form the duct in a continuous operation to a length equal to that of the sheets so that rectangular ducts of any desired length can be produced in an automatic operation by merely inserting into the machine a pre-prepared roll comprised of a pair of sheets of metal of the desired length, the sheets entering the machine at one end and leaving the same at the other end in the form of a continuous rectangular duct.
Inventors
- 👤 L Anderson
- 👤 G Munn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:09
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0245; B; B21; B21D; B21D39/00; B21D39/02; B21D39/026; B21D5/00; B21D5/06; B21D5/10; B21D5/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
209 words
A rigid non-collapsible rectangular air conduit comprising: a. a pair of elongated metal sheet members of substantially equal length, b. the lateral portions of at least one of said members having been bent progressively inwardly at right angles toward the other of said sheet members and meeting lateral portions thereof and cooperatively defining therewith a rigid noncollapsible air duct having a rectangular interior when considered cross-sectionally, c. the corresponding lateral portions of said sheet members cooperatively constituting a pair of longitudinally extending seams, one each of which is disposed at opposite sides of the conduit, d. each of said seams being comprised of a sealing flange element carried by the lateral edge portions of one of said members and a lip element carried by the corresponding lateral edge portions of the other of said sheet members, e. said lip element extending along opposite sides and around the edge of said flange element, g. each of the portions of said lip element disposed at opposite sides of said flange element and the portion of said flange element disposed therebetween being cooperatively deformed at spaced locations along the length of said seams to seal and interlock said elements and thereby secure said sheet members to each other in interlocking conduit-defining relation.
Claim 2
Dependent Claim
209 words
A rigid non-collapsible rectangular air conduit comprising: a. a pair of elongated metal sheet members of substantially equal length, b. the lateral portions of at least one of said members having been bent progressively inwardly at right angles toward the other of said sheet members and meeting lateral portions thereof and cooperatively defining therewith a rigid noncollapsible air duct having a rectangular interior when considered cross-sectionally, c. the corresponding lateral portions of said sheet members cooperatively constituting a pair of longitudinally extending seams, one each of which is disposed at opposite sides of the conduit, d. each of said seams being comprised of a sealing flange element carried by the lateral edge portions of one of said members and a lip element carried by the corresponding lateral edge portions of the other of said sheet members, e. said lip element extending along opposite sides and around the edge of said flange element, g. each of the portions of said lip element disposed at opposite sides of said flange element and the portion of said flange element disposed therebetween being cooperatively deformed at spaced locations along the length of said seams to seal and interlock said elements and thereby secure said sheet members to each other in interlocking conduit-defining relation.
Claim 3
Dependent Claim
25 words
The structure defined in claim 1 wherein said seams are disposed adjacent opposite and adjacent corners of the rectangular configuration defined by said sheet members.
Claim 4
Dependent Claim
23 words
The structure defined in claim 1 wherein portions of said sealing element extend into the plane of a portion of said lip element.
Claim 5
Dependent Claim
40 words
The structure defined in claim 1 wherein at each of said deformations, portions Of said lip element extend into the plane of said flange element and portions of said flange element extend into the opposite portions of said lip element.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |