US4227572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finned tubing
Assignee: SETON SCHERR Inc
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Filing: 1978-03-27
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Granted: 1980-10-14
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Expires: 1998-03-27
Abstract
Abstract Finned tubing for use in heat exchangers has tapered helical fins with serrations disposed between connecting webs. The opposed edges of the serrations, interior of the periphery, taper to a relatively sharp edge. Shark-fin like protuberances project outwardly adjacent one leg of each serration with each protuberance having a flange thereon. In one modification, the serrations on adjacent fins are spirally aligned. One method and apparatus of producing the finned tubing subjects a tensioned strip to graduated compression to curl the strip onto a tube to form fins, while simultaneously relieving a portion of the compression at spaced points along the periphery of the strip, resulting in a tearing of the strip to provide the serrations, and the adjacent protuberances. The protuberances are then compressed by rollers to form the flanges. An apparatus for carrying out the method includes a pair of rotary members to taper and curl the strip, with one of the rotary members having a series of recesses. Another method of producing some form of serration uses a raised projection on a rotary member instead of a recess.
Inventors
- 👤 Courtney S. Harlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:35
CPC Classifications
B; B23; B23D; B23D31/00; B23D31/002; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/26; F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49382
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
A finned tubing for use in heat exchange comprising, a cylindrical tube, a strip of material helically disposed about said tube to form a series of helically disposed fin convolutions, a plurality of said fin convolutions having generally radially outwardly extending webs defining serrations therebetween along the outer periphery of said fin convolutions, the sides of said webs extending inwardly of said periphery and defining the opposed legs of said serrations, a laterally extending flange disposed on the periphery of each web adjacent at least one of said sides, said flange being wider than the general thickness of said fin convolution adjacent said flange, said one side having faces which taper to a terminal edge so as to provide a relatively sharp edge on at least one leg of each serration inwardly of said flange.
Claim 2
Dependent Claim
135 words
A finned tubing for use in heat exchange comprising, a cylindrical tube, a strip of material helically disposed about said tube to form a series of helically disposed fin convolutions, a plurality of said fin convolutions having generally radially outwardly extending webs defining serrations therebetween along the outer periphery of said fin convolutions, the sides of said webs extending inwardly of said periphery and defining the opposed legs of said serrations, a laterally extending flange disposed on the periphery of each web adjacent at least one of said sides, said flange being wider than the general thickness of said fin convolution adjacent said flange, said one side having faces which taper to a terminal edge so as to provide a relatively sharp edge on at least one leg of each serration inwardly of said flange.
Claim 3
Dependent Claim
24 words
A finned tubing in accordance with claim 1 wherein said faces taper in the general direction of the fin convolution from which they project.
Claim 4
Dependent Claim
20 words
A finned tubing in accordance with claim 2, wherein both opposed legs of the serrations have a relatively sharp edge.
Claim 5
Dependent Claim
87 words
A finned tubing for use in heat exchangers comprising, a cylindrical tube, a strip material helically disposed about said tube to form a series of helically disposed fin convolutions, said fin convolutions having serrations on the outer periphery thereof to provide alternating webs and serrations with the web periphery being generally disposed in a circumferential direction and the serrations having opposed legs, with a portion of the web projecting generally radially peripherally of the general circumferential disposition of the web adjacent at least one of said legs.
Claim 6
Dependent Claim
87 words
A finned tubing for use in heat exchangers comprising, a cylindrical tube, a strip material helically disposed about said tube to form a series of helically disposed fin convolutions, said fin convolutions having serrations on the outer periphery thereof to provide alternating webs and serrations with the web periphery being generally disposed in a circumferential direction and the serrations having opposed legs, with a portion of the web projecting generally radially peripherally of the general circumferential disposition of the web adjacent at least one of said legs.
Claim 7
Dependent Claim
28 words
A finned tubing in accordance with claim 4 wherein, the peripheral projecting portion of the web is generally in the configuration of the dorsal fin of a shark.
Claim 8
Dependent Claim
23 words
A finned tuging in accordance with claim 4, wherein said projecting portion has a peripheral flange which projects laterally of said projecting portion.
Claim 9
Dependent Claim
26 words
A finned tubing in accordance with claim 6, wherein said legs define edges which are sufficiently reduced in thickness so as to provide relatively sharp edges.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |