US4400228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making lengths of flexible insulated air duct with end collars
Assignee: Atco Rubber Products Inc
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Filing: 1982-06-30
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Granted: 1983-08-23
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Expires: 2002-06-30
Abstract
Abstract A tubular jacket of flexible plastic film is telescoped over one of two spaced coaxial mandrels extending toward each other, duct end collars are secured respectively on the mandrels, opposite ends of a flexible helically reinforced core are strapped respectively to the collars, a flexible insulation blanket is wrapped around the core and taped adjacent opposite ends, the jacket is pulled over the blanket, the collars are released, and the collared duct is removed from the mandrels.
Inventors
- 👤 Gary F. Gentry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:15
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0218; B; B29; B29C; B29C53/00; B29C53/80; B29C53/8008; B29C63/00; B29C63/02; B29C63/04; B29C63/12; B29C63/14; B29C63/145; B29C70/00; B29C70/68; B29C70/72; B29C70/86; B29D; B29D23/00; F16; F16L; F16L59/00; F16L59/14; F16L59/153; F24F13/0245; F24F13/0263
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
205 words
A method of making lengths of flexible insulated air duct bendable around corners without collapsing and having end collars, the method comprising telescoping a tubular jacket of flexible plastic film over a free end portion of a cantilevered first mandrel adjacent one end of a machine and gathering the jacket adjacent a mounted end portion of the first mandrel, telescoping a first duct end collar over the free end portion of the first mandrel and securing it in position, telescoping a second duct end collar over a free end portion of a cantilevered second mandrel adjacent another end of the machine and coaxial with the first mandrel and securing the second duct end collar in position, telescoping opposite end portions of a flexible helically reinforced core respectively over and strapping them respectively to the duct end collars, wrapping a flexible insulation blanket around the core and taping opposite end portions of the blanket in place, pulling an end of the tubular jacket on the first mandrel over the insulation blanket all along the length thereof to extend the gathered jacket full length and encase the insulation blanket therein, releasing the duct end collars respectively from the mandrels, and removing the collared duct from the machine.
Claim 2
Independent Claim
205 words
A method of making lengths of flexible insulated air duct bendable around corners without collapsing and having end collars, the method comprising telescoping a tubular jacket of flexible plastic film over a free end portion of a cantilevered first mandrel adjacent one end of a machine and gathering the jacket adjacent a mounted end portion of the first mandrel, telescoping a first duct end collar over the free end portion of the first mandrel and securing it in position, telescoping a second duct end collar over a free end portion of a cantilevered second mandrel adjacent another end of the machine and coaxial with the first mandrel and securing the second duct end collar in position, telescoping opposite end portions of a flexible helically reinforced core respectively over and strapping them respectively to the duct end collars, wrapping a flexible insulation blanket around the core and taping opposite end portions of the blanket in place, pulling an end of the tubular jacket on the first mandrel over the insulation blanket all along the length thereof to extend the gathered jacket full length and encase the insulation blanket therein, releasing the duct end collars respectively from the mandrels, and removing the collared duct from the machine.
Claim 3
Dependent Claim
51 words
A method as claimed in claim 1 wherein a leading edge of the insulation blanket is taped to the core respectively adjacent opposite ends and the mandrels are then rotated about two revolutions to wind the blanket around the core and wind tape around the blanket respectively adjacent the opposite ends.
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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |