Patent US3890182A successfully refreshed from Google Patents.
US3890182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for applying a cover to a conduit
Assignee: Johns Manville Corp
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Filing: 1973-04-04
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Granted: 1975-06-17
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Expires: 1993-04-04
Abstract
Abstract A sheet of cover material having a heat activated adhesive on one major face is wrapped about and bonded to an outer surface of a duct. The duct is positioned on a pair of rolls, one of which is heated, and is pressed against the rolls through a pressure applicator. The rolls and an endless belt assembly of the pressure applicator are all driven at the same surface speed to effect rotation of the duct while maintaining the duct in a fixed position. As the duct is rotating a finite length of the cover material is fed between the heated roll and the duct whereby the cover is bonded to and wrapped about the duct. Once the duct is wrapped, the duct is ejected from the apparatus by stopping the endless belt assembly of the pressure applicator. With the endless belt assembly stopped, the rolls move the duct out of the apparatus.
Inventors
- 👤 Rupert Douglas Terry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:28
CPC Classifications
B; B29; B29C; B29C63/00; B29C63/02; B29C63/04; B29C63/12; B29C63/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
219 words
Method for applying a cover to a tubular duct comprising: a. locating a tubular duct on means for supporting the duct which includes a heated roll and a second roll in contact with an outer surface of the duct, b. effecting rotation of the duct about its longitudinal axis while maintaining the duct in a fixed location by rotating said rolls at the same surface speed, c. feeding a cover of finite length and having a heat activated adhesive on a major face thereof intermediate the heated roll and the duct to heat the adhesive and bring the major face with the adhesive into contact with the outer surface of the duct, d. applying pressure to the duct to cause the heated roll to be pressed against the duct by means of pressure applying means which has a surface speed equal to the surface speeds of said rolls and which engages the outer surfaces of the duct on a portion of the outer surface generally diametrically opposed to the support means, e. rotating the duct until the cover is wrapped about the duct, and f. effecting movement of the duct away from the support means after the cover has been wrapped about the duct by stopping movement of the pressure applying means while continuing the rotation of said rolls.
Claim 2
Dependent Claim
219 words
Method for applying a cover to a tubular duct comprising: a. locating a tubular duct on means for supporting the duct which includes a heated roll and a second roll in contact with an outer surface of the duct, b. effecting rotation of the duct about its longitudinal axis while maintaining the duct in a fixed location by rotating said rolls at the same surface speed, c. feeding a cover of finite length and having a heat activated adhesive on a major face thereof intermediate the heated roll and the duct to heat the adhesive and bring the major face with the adhesive into contact with the outer surface of the duct, d. applying pressure to the duct to cause the heated roll to be pressed against the duct by means of pressure applying means which has a surface speed equal to the surface speeds of said rolls and which engages the outer surfaces of the duct on a portion of the outer surface generally diametrically opposed to the support means, e. rotating the duct until the cover is wrapped about the duct, and f. effecting movement of the duct away from the support means after the cover has been wrapped about the duct by stopping movement of the pressure applying means while continuing the rotation of said rolls.
Claim 3
Dependent Claim
36 words
The method as defined in claim 1 wherein the cover is cooled by said second roll to help set the adhesive after the cover has been brought into contact with the outer surface of the duct.
Claim 4
Dependent Claim
206 words
Apparatus for applying a cover having a major surface of a heat activated adhesive to tubular duct comprising: a. means for supporting and rotating a duct while maintaining the duct in a fixed location including first and second rolls located adjacent each other and extending parallel with respect to each other and means for rotating said rolls at the same surface speed, b. means for bringing a cover into contact with an outer surface of the duct as it is rotated and for heating the cover to activate an adhesive on the cover including said first roll and means for heating said first roll, c. means for applying pressure to the duct to cause said first and second rolls to be pressed against the duct, said pressure applying means being located to engage the outer surface of the duct on a portion of the outer surface diametrically opposed to the support means, and means for driving said pressure applying means at a surface speed equal to the surface speeds of said first and second rolls, and d. means for stopping said pressure applying means while said first and second rolls continue to rotate to eject the duct from the apparatus after the duct has been wrapped.
Claim 5
Dependent Claim
206 words
Apparatus for applying a cover having a major surface of a heat activated adhesive to tubular duct comprising: a. means for supporting and rotating a duct while maintaining the duct in a fixed location including first and second rolls located adjacent each other and extending parallel with respect to each other and means for rotating said rolls at the same surface speed, b. means for bringing a cover into contact with an outer surface of the duct as it is rotated and for heating the cover to activate an adhesive on the cover including said first roll and means for heating said first roll, c. means for applying pressure to the duct to cause said first and second rolls to be pressed against the duct, said pressure applying means being located to engage the outer surface of the duct on a portion of the outer surface diametrically opposed to the support means, and means for driving said pressure applying means at a surface speed equal to the surface speeds of said first and second rolls, and d. means for stopping said pressure applying means while said first and second rolls continue to rotate to eject the duct from the apparatus after the duct has been wrapped.
Claim 6
Dependent Claim
40 words
The apparatus as defined in claim 3 including: a. means for setting the adhesive after the cover has been brought into contact with the duct by the first roll including said second roll and means for cooling said second roll.
Claim 7
Dependent Claim
41 words
Apparatus as defined in claim 3 comprising: a. means for adjusting the location of said first and second rolls relative to each other in a direction perpendicular to their longitudinal axes to enable the apparatus to accommodate duct of different diameters.
Claim 8
Dependent Claim
34 words
Apparatus as defined in claim 5 wherein: a. one of said first and second rolls is smaller in diameter than the other of said rolls to enable the apparatus to accommodate small diameter ducts.
Claim 9
Dependent Claim
36 words
Apparatus as defined in claim 3 wherein: a. the pressure applying means comprises endless belt means which engages the outer surface of the duct on a portion of the surface diametrically opposed to the support means
Claim 10
Dependent Claim
34 words
Apparatus as defined in claim 2 and 3 further comprising: a. means for mounting a supply roll of the cover material, and b. means for cutting the cover material into sheets of finite lengths.
Claim 11
Dependent Claim
37 words
Apparatus as defined in claim 8 wherein: a. the feed means includes means for preventing more than oNe sheet of the cover material from being fed between the heated roll and the duct during a wrapping cycle.
Claim 12
Dependent Claim
28 words
Apparatus as defined in claim 3 and further comprising: a. means for introducing the duct onto the support means and for locating the duct on the support means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |