US3863480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming corrugated strip material into helically wound tubing
Assignee: Johns Manville Corp
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Filing: 1973-08-28
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Granted: 1975-02-04
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Expires: 1993-08-28
Abstract
Abstract An apparatus convolutes a corrugated strip material about a mandrel to form a helically wound tubing. A pair of forming rolls nest complementary edge portions of adjacent convolutions together. After the edge portions have been nested, the formation of the seam joining the adjacent convolutions is initiated by the same forming rolls. A separate guide roll contacts the strip material after it has passed through the forming rolls to convolute the strip material about the mandrel and to further close the seam which has been initiated by the forming rolls. After the seam has been further closed by this separate guide roll, the seam of the tubing passes back between the pair of forming rolls where a surface provided with teeth on one roll and a backing surface on the other roll combine to flatten the seam into its final configuration.
Inventors
- 👤 Robert H Meserole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:04
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/12; B21C37/121; B21C37/124
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
311 words
Apparatus for forming corrugated strip material into helically wound tubing wherein said strip material has first and second longitudinal edge portions which are complementary with respect to each other with said second edge portion being adapted to be nested within said first edge portion and with each of said edge portions having a longitudinally extending rib means spaced inwardly from the longitudinal edges of said strip material with said rib means being adapted to be folded over toward each other to form a seam of the helically wound tubing, comprising: mandrel means having a surface about which said strip material is convoluted to set the diameter of the tubing, said mandrel means having a longitudinal axis, forming roll means located adjacent said mandrel means for nesting said second edge portion within said first edge portion and for initiating a folding over of said rib means toward each other to partially form a seam, said forming means including a roll with a V-shaped groove therein having faces which engage said rib means to initiate the folding over of said rib means, said V-shaped groove having an included angle between said faces greater than 90*, and said V-shaped groove having a mouth with a width greater than the distance between the outer faces of said rib means of the nested edge portions, a second roll with a backing surface which opposes said V-shaped groove, said rolls being rotatably mounted on the apparatus, and each of said rolls having a series of spaced apart annular ribs which extend into corrugations of said strip material to guide said strip material so that said nested edge portions of said strip material are centered with respect to said V-shaped groove, and means for feeding said strip material into said forming roll means and about said mandrel at an angle relative to the longitudinal centerline of said mandrel.
Claim 2
Dependent Claim
311 words
Apparatus for forming corrugated strip material into helically wound tubing wherein said strip material has first and second longitudinal edge portions which are complementary with respect to each other with said second edge portion being adapted to be nested within said first edge portion and with each of said edge portions having a longitudinally extending rib means spaced inwardly from the longitudinal edges of said strip material with said rib means being adapted to be folded over toward each other to form a seam of the helically wound tubing, comprising: mandrel means having a surface about which said strip material is convoluted to set the diameter of the tubing, said mandrel means having a longitudinal axis, forming roll means located adjacent said mandrel means for nesting said second edge portion within said first edge portion and for initiating a folding over of said rib means toward each other to partially form a seam, said forming means including a roll with a V-shaped groove therein having faces which engage said rib means to initiate the folding over of said rib means, said V-shaped groove having an included angle between said faces greater than 90*, and said V-shaped groove having a mouth with a width greater than the distance between the outer faces of said rib means of the nested edge portions, a second roll with a backing surface which opposes said V-shaped groove, said rolls being rotatably mounted on the apparatus, and each of said rolls having a series of spaced apart annular ribs which extend into corrugations of said strip material to guide said strip material so that said nested edge portions of said strip material are centered with respect to said V-shaped groove, and means for feeding said strip material into said forming roll means and about said mandrel at an angle relative to the longitudinal centerline of said mandrel.
Claim 3
Dependent Claim
62 words
Apparatus as defined in claim 1 wherein: said forming means has flattening means which includes a surface with teeth thereon which engage and extend transversely with respect to the partially formed seam of the helical tubing after the seam has been partially formed by said V-shaped groove to complete the folding over of said rib means and the formation of said seam.
Claim 4
Dependent Claim
37 words
Apparatus as defined in claim 2 wherein: said flattening means has a centerline that is spaced from a centerline of said V-shaped groove a distance equal to the pitch of the seam of the helically wound tubing.
Claim 5
Dependent Claim
39 words
Apparatus as defined in claim 1 and further comprising: a rotatably mounted guide roll located adjacent said mandrel surface for directing said strip material after it passes through said forming means to convolute said strip material about said mandrel.
Claim 6
Dependent Claim
67 words
Apparatus as defined in claim 4 wherein: said guide roll includes a V-shaped groove having faces for engaging said rib means of the partially formed seam formed by said forming means to further fold over said rib means, and said V-shaped groove of said guide roll having an included angle between said faces thereof greater than the included angle of the V-shaped groove of said forming means.
Claim 7
Dependent Claim
28 words
Apparatus as defined in claim 1 wherein said faces of said V-shaped groove extend in a straight line from the juncture of said faces to their outer edges.
Claim 8
Dependent Claim
14 words
Apparatus as defined in claim 1 wherein: said included angle is at least 110*.
Claim 9
Dependent Claim
22 words
Apparatus as defined in claim 5 wherein: said included angle of said V-shaped groove of said guide means is at least 140*.
Claim 10
Dependent Claim
63 words
Apparatus as defined in claim 5 wherein: said manrel is replaceably mounted on said apparatus, and said guide roll is mounted on a support means which can be adjusted to move said guide roll to change the radial distance between the central axis of said mandrel and said guide roll so that said guide roll can be relocated to accommodate different size mandrels.
Claim 11
Dependent Claim
49 words
Apparatus as defined in claim 1 including adjustment means for adjusting the angle between the longitudinal centerline of the strip material being fed about said mandrel and the longitudinal axis of said mandrel to enable the mandrel to be set to accommodate the pitch of the tubing being formed.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |