Patent US3836181A successfully refreshed from Google Patents.
US3836181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleat for joining duct work
Assignee: Individual
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Filing: 1973-06-07
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Granted: 1974-09-17
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Expires: 1993-06-07
Abstract
Abstract A cleat which is used for joining ducts and which includes Sshaped folds for accommodating the marginal portions of the duct walls. The cleat includes a leg which projects from the S-shaped folded portion of the cleat and which terminates in a generally right angular flange. The leg and right angular flange serve as strengthening members for the cleat and can be utilized to accommodate the edge portion of an insulative or similar type liner extending along the interior of the ducts.
Inventors
- 👤 D Kelver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:08
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0209; F16; F16L; F16L25/00; F16L25/0009; F16L59/00; F16L59/14; F16L59/147; F16L59/16; F16L59/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
279 words
A cleat for joining first and second ducts, said ducts having substantially similar quadrangular cross sectional shapes and positioned in an end-to-end relationship, each duct having an outer wall and a liner of selected material overlying the inner surface of said outer wall, the liner of each duct terminating in an end, the outer wall of each duct having an end portion extending beyond said end of its overlying liner, said cleat positioned between ducts and comprising an outer fold paralleling the longitudinal dimension of said cleat, a middle fold paralleling the longitudinal dimension of said cleat and joined at one longitudinal edge to one longitudinal edge of said outer fold and bent thereover to form a channel between said outer and middle folds, an inner fold paralleling the longitudinal dimension of said cleat and joined at one longitudinal edge to the opposite longitudinal edge of said middle fold and bent thereover to form a channel between said inner and middle folds, said inner and middle and outer folds having an S-shaped cross sectional configuration, a leg paralleling the longitudinal dimension of said cleat and projecting substantially perpendicularly from said inner fold between said one longitudinal edge and the opposite longitudinal edge of the inner fold, said leg terminating in a flange spacedly overlying said inner fold, the end portion of said first duct outer wall positioned in said channel between said outer and middle folds, the end portion of said second duct wall positioned in said channel between said inner and middle folds, the end of the liner of one of said first and second ducts fitted under said flange and over a portion of said inner fold.
Claim 2
Dependent Claim
279 words
A cleat for joining first and second ducts, said ducts having substantially similar quadrangular cross sectional shapes and positioned in an end-to-end relationship, each duct having an outer wall and a liner of selected material overlying the inner surface of said outer wall, the liner of each duct terminating in an end, the outer wall of each duct having an end portion extending beyond said end of its overlying liner, said cleat positioned between ducts and comprising an outer fold paralleling the longitudinal dimension of said cleat, a middle fold paralleling the longitudinal dimension of said cleat and joined at one longitudinal edge to one longitudinal edge of said outer fold and bent thereover to form a channel between said outer and middle folds, an inner fold paralleling the longitudinal dimension of said cleat and joined at one longitudinal edge to the opposite longitudinal edge of said middle fold and bent thereover to form a channel between said inner and middle folds, said inner and middle and outer folds having an S-shaped cross sectional configuration, a leg paralleling the longitudinal dimension of said cleat and projecting substantially perpendicularly from said inner fold between said one longitudinal edge and the opposite longitudinal edge of the inner fold, said leg terminating in a flange spacedly overlying said inner fold, the end portion of said first duct outer wall positioned in said channel between said outer and middle folds, the end portion of said second duct wall positioned in said channel between said inner and middle folds, the end of the liner of one of said first and second ducts fitted under said flange and over a portion of said inner fold.
Claim 3
Dependent Claim
69 words
The cleat of claim 1 wherein said leg terminates in a second flange, said first mentioned flange extending outwardly from one side of said leg, said second flange extending outwardly from the opposite side of said leg and overlying said inner fold, the end of the liner of the other of said first and second ducts fitted under said second flange and over a portion of said inner fold.
Claim 4
Dependent Claim
27 words
The cleat of claim 2 wherein said first mentioned and second flanges are coplanar with said leg and flanges and inner fold being I-shaped in cross section.
Claim 5
Dependent Claim
261 words
A cleat for joining first and second ducts, said ducts having substantially similar quadrangular cross sectional shapes and positioned in an end-to-end relationship, each duct having a wall, said cleat positioned between ducts and comprising an outer fold paralleling the longitudinal dimension of said cleat, a middle fold paralleling the longitudinal dimension of said cleat joined at one longitudinal edge to one longitudinal edge of said outer fold and bent thereover to form a channel between said outer and middle folds, an inner fold paralleling the longitudinal dimension of said cleat and joined at one longitudinal edge to the opposite longitudinal edge of said middle fold and bent thereover to form a channel between said inner and middle folds, said inner and middle and outer folds having an S-shaped cross sectionAl configuration, a leg paralleling the longitudinal dimension of said cleat and projecting substantially perpendicularly from said inner fold between said one longitudinal edge and the opposite longitudinal edge of the inner fold, said leg terminating in first and second oppositely extending coplanar flanges paralleling the longitudinal dimension of said cleat, said first flange overlying said inner fold at one side of said leg and said second flange overlying said inner fold at said opposite side of said leg, said inner fold and leg and first and second flanges having an I-shaped cross sectional configuration, the end portion of said first duct wall positioned in said channel between said outer and middle folds, the end portion of said second duct wall positioned in said channel between said inner and middle folds.
Claim 6
Dependent Claim
261 words
A cleat for joining first and second ducts, said ducts having substantially similar quadrangular cross sectional shapes and positioned in an end-to-end relationship, each duct having a wall, said cleat positioned between ducts and comprising an outer fold paralleling the longitudinal dimension of said cleat, a middle fold paralleling the longitudinal dimension of said cleat joined at one longitudinal edge to one longitudinal edge of said outer fold and bent thereover to form a channel between said outer and middle folds, an inner fold paralleling the longitudinal dimension of said cleat and joined at one longitudinal edge to the opposite longitudinal edge of said middle fold and bent thereover to form a channel between said inner and middle folds, said inner and middle and outer folds having an S-shaped cross sectionAl configuration, a leg paralleling the longitudinal dimension of said cleat and projecting substantially perpendicularly from said inner fold between said one longitudinal edge and the opposite longitudinal edge of the inner fold, said leg terminating in first and second oppositely extending coplanar flanges paralleling the longitudinal dimension of said cleat, said first flange overlying said inner fold at one side of said leg and said second flange overlying said inner fold at said opposite side of said leg, said inner fold and leg and first and second flanges having an I-shaped cross sectional configuration, the end portion of said first duct wall positioned in said channel between said outer and middle folds, the end portion of said second duct wall positioned in said channel between said inner and middle folds.
Claim 7
Dependent Claim
19 words
The cleat of claim 4 wherein said leg and first and second flanges are located exteriorly of said ducts.
Claim 8
Dependent Claim
64 words
The cleat of claim 4 wherein said ducts each include a liner of selected material overlying the inner surface of said duct''s wall, said leg and first and second flanges being located interiorly of said ducts, the liner of said first duct fitted between said first flange and inner fold, the liner of said second duct fitted between said second flange and inner fold.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |