US3712650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flange connection for airconditioning ducts
Assignee: Individual
•
Filing: 1970-12-10
•
Granted: 1973-01-23
•
Expires: 1990-12-10
Abstract
Abstract A four-sided flange is slidable and fastened over the free end of a sheet metal duct. The flange is hollow and has a pair of parallel walls perpendicular to the duct. A solid angle piece is insertable at each corner of the flange into the space between the walls and fastened. The thickness of the angle piece corresponds to the space between the walls.
Inventors
- 👤 G Mez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:04
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/12; F16L23/14; F24; F24F; F24F13/00; F24F13/02; F24F13/0209; F16B; F16B2200/00; F16B2200/50; F16B2200/503
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
221 words
A prefabricated flange connection for large dimension rectangular air conditioning ducts comprising flange means comprising duct wall-engaging means adapted to be slid upon and fastened upon the free end of a duct, a plurality of sheet metal frame members, each being hollow and open at both ends and having two substantially parallel, spaced-apart planar wall areas forming a recess between them, which run substantially perpendicular to the plane of the duct wall to which the flange means is fastened, the end portions of adjacent frame members having a clearance between them at least at one of said parallel wall areas which allows a view of the bend area between adjacent walls of the duct and the ends of adjacent duct walls, and a solid metal angle piece having end portions which are matingly insertable into the recesses of adjacent frame members, the thickness of the insertable portion of the angle piece corresponding to the separation between the parallel wall areas of the frame members, the portion of the angle piece not inserted within a recess of a frame member being raised from the plane of its inserted portions forming with the exterior of said parallel wall areas a flat surfaced flange means, the ends of the adjacent duct walls resting against the angle piece at least in the visible bend area.
Claim 2
Dependent Claim
221 words
A prefabricated flange connection for large dimension rectangular air conditioning ducts comprising flange means comprising duct wall-engaging means adapted to be slid upon and fastened upon the free end of a duct, a plurality of sheet metal frame members, each being hollow and open at both ends and having two substantially parallel, spaced-apart planar wall areas forming a recess between them, which run substantially perpendicular to the plane of the duct wall to which the flange means is fastened, the end portions of adjacent frame members having a clearance between them at least at one of said parallel wall areas which allows a view of the bend area between adjacent walls of the duct and the ends of adjacent duct walls, and a solid metal angle piece having end portions which are matingly insertable into the recesses of adjacent frame members, the thickness of the insertable portion of the angle piece corresponding to the separation between the parallel wall areas of the frame members, the portion of the angle piece not inserted within a recess of a frame member being raised from the plane of its inserted portions forming with the exterior of said parallel wall areas a flat surfaced flange means, the ends of the adjacent duct walls resting against the angle piece at least in the visible bend area.
Claim 3
Dependent Claim
74 words
A flange connection according to claim 1 in which a first of said parallel wall areas extends approximately the height of the frame member and a second of said parallel wall area extends from the height of the frame member a part of the distance to the duct and thence the wall runs at a slanted angle to the duct for providing bracing strength and clearance between the end portions of adjacent frame members.
Claim 4
Dependent Claim
31 words
A flange connection according to claim 1 in which the inserted portions of the angle piece have at least one bevel which runs perpendicular to the plane of the angle piece.
Claim 5
Dependent Claim
22 words
A flange connection according to claim 1 in which the bend area of the adjacent duct walls is a complete, unopened fold.
Claim 6
Dependent Claim
48 words
A flange connection according to claim 21 in which each frame member has a second pair of substantially parallel wall areas, which wall areas extend different distances relative to each other and provide jaw means for engaging with and fastening upon in inserted free end of the duct.
Claim 7
Dependent Claim
41 words
A flange connection according to claim 5 in which the length of the outer one of said second pair of parallel wall areas relative to said duct wall extends a shorter distance than the other one of said parallel wall areas.
Claim 8
Dependent Claim
36 words
A flange connection according to claim 1 in which the wall areas have a through bore for a screw connection which registers with a corresponding through bore of an adjacent flange means on an adjacent duct.
References Cited (Backward Citations)
US565499A
Cited
US3199901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |