Patent US3866286A successfully refreshed from Google Patents.
US3866286A
Expired / Lapsed
US
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Method of making a finned tube heat exchanger having a circular cross section
Assignee: Peerless of America Inc
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Filing: 1973-07-02
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Granted: 1975-02-18
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Expires: 1993-07-02
Abstract
Abstract A method of making heat exchangers in the form of an elongated tubular member, of substantially round transverse cross-section and having outwardly projecting fins thereon, which include initially forming the tubular member into a substantially rectangular transverse cross-sectional shape, forming the fins on the outer faces of the tubular member, and then expanding the tubular member into the aforementioned substantially round crosssectional shape.
Inventors
- 👤 Stephen F Pasternak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:07
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21J; B21J5/00; B21J5/06; B21J5/068; B23; B23P; B23P15/00; B23P15/26; F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/124; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
112 words
The method of making a heat transfer element comprising a. forming an elongated tubular member having 1. a transverse width in one direction which is greater than the width thereof in the direction perpendicular to said one direction, 2. oppositely disposed outer wall portions extending along said first mentioned width, and 3. transversely spaced, outwardly projecting elongated ribs on the outer surfaces of said wall portions and extending longitudinally of said tubular member b. successively, longitudinally of said tubular member, cutting fins from said ribs, c. turning said fins outwardly into outwardly projecting relation to said wall portions, and d. then expanding said tubular member into a more rounded transverse cross-sectional shape.
Claim 2
Independent Claim
112 words
The method of making a heat transfer element comprising a. forming an elongated tubular member having 1. a transverse width in one direction which is greater than the width thereof in the direction perpendicular to said one direction, 2. oppositely disposed outer wall portions extending along said first mentioned width, and 3. transversely spaced, outwardly projecting elongated ribs on the outer surfaces of said wall portions and extending longitudinally of said tubular member b. successively, longitudinally of said tubular member, cutting fins from said ribs, c. turning said fins outwardly into outwardly projecting relation to said wall portions, and d. then expanding said tubular member into a more rounded transverse cross-sectional shape.
Claim 3
Dependent Claim
12 words
oppositely disposed outer wall portions extending along said first mentioned width, and
Claim 4
Dependent Claim
12 words
oppositely disposed outer wall portions extending along said first mentioned width, and
Claim 5
Dependent Claim
18 words
said tool is passed into one end portion of said tubular member to cause initial expansion thereof, and
Claim 6
Dependent Claim
18 words
said tool is passed into one end portion of said tubular member to cause initial expansion thereof, and
Claim 7
Dependent Claim
14 words
two oppositely disposed, substantially parallel walls extending the width of said tubular member, and
Claim 8
Dependent Claim
14 words
two oppositely disposed, substantially parallel walls extending the width of said tubular member, and
Claim 9
Dependent Claim
31 words
extend between said two walls in substantially parallel relation to each other, and b. said expanding of said tubular member includes separating each of said internal ribs into two spaced parts.
Claim 10
Dependent Claim
31 words
extend between said two walls in substantially parallel relation to each other, and b. said expanding of said tubular member includes separating each of said internal ribs into two spaced parts.
Claim 11
Dependent Claim
14 words
two oppositely disposed, substantially parallel walls extending the width of said tubular member, and
Claim 12
Dependent Claim
14 words
two oppositely disposed, substantially parallel walls extending the width of said tubular member, and
Claim 13
Independent Claim
16 words
The method of making a heat transfer element comprising a. forming an elongated tubular member having
Claim 14
Independent Claim
16 words
The method of making a heat transfer element comprising a. forming an elongated tubular member having
Claim 15
Dependent Claim
60 words
transversely spaced, outwardly projecting elongated ribs on the outer surfaces of said wall portions and extending longitudinally of said tubular member b. successively, longitudinally of said tubular member, cutting fins from said ribs, c. turning said fins outwardly into outwardly projecting relation to said wall portions, and d. then expanding said tubular member into a more rounded transverse cross-sectional shape.
Claim 16
Dependent Claim
60 words
transversely spaced, outwardly projecting elongated ribs on the outer surfaces of said wall portions and extending longitudinally of said tubular member b. successively, longitudinally of said tubular member, cutting fins from said ribs, c. turning said fins outwardly into outwardly projecting relation to said wall portions, and d. then expanding said tubular member into a more rounded transverse cross-sectional shape.
Claim 17
Dependent Claim
26 words
The method as defined in claim 2, and in which a. said forming of said tubular member includes forming a plurality of internal ribs therein, which
Claim 18
Dependent Claim
61 words
a plurality of transversely spaced, elongated ribs projecting outwardly from said walls and extending longitudinally of said tubular member, b. successively, longitudinally of said tubular member, cutting fins from said ribs, c. turning said fins outwardly into outwardly projecting relation to said walls, and d. expanding said tubular member, with said fins thereon, into a substantially round, internal, transverse cross-sectional shape.
Claim 19
Dependent Claim
61 words
a plurality of transversely spaced, elongated ribs projecting outwardly from said walls and extending longitudinally of said tubular member, b. successively, longitudinally of said tubular member, cutting fins from said ribs, c. turning said fins outwardly into outwardly projecting relation to said walls, and d. expanding said tubular member, with said fins thereon, into a substantially round, internal, transverse cross-sectional shape.
Claim 20
Dependent Claim
81 words
a plurality of transversely spaced elongated ribs projecting transversely outwardly from each of said walls and extending longitudinally of said tubular member, b. successively, longitudinally of said tubular member, cutting elongated spines from said ribs, c. turning said spines outwardly into outwardly projecting relation to said walls, and d. passing expanding means into said tubular member and thereby expanding said tubular member into a substantially round transverse cross-sectional shape, with said spines projecting outwardly and forming the outermost peripheral portion thereof.
Claim 21
Dependent Claim
81 words
a plurality of transversely spaced elongated ribs projecting transversely outwardly from each of said walls and extending longitudinally of said tubular member, b. successively, longitudinally of said tubular member, cutting elongated spines from said ribs, c. turning said spines outwardly into outwardly projecting relation to said walls, and d. passing expanding means into said tubular member and thereby expanding said tubular member into a substantially round transverse cross-sectional shape, with said spines projecting outwardly and forming the outermost peripheral portion thereof.
Claim 22
Dependent Claim
15 words
thereafter other expanding means is passed into said tubular member to effect final expansion thereof.
Claim 23
Dependent Claim
15 words
thereafter other expanding means is passed into said tubular member to effect final expansion thereof.
Claim 24
Dependent Claim
42 words
The method as defined in claim 3, and in which a. said forming of said internal ribs includes forming the portions thereof which are disposed substantially midway between said two walls of reduced thickness as compared to the remainder of said ribs.
Claim 25
Dependent Claim
38 words
The method as defined in claim 2, and which includes a. flattening said tubular member into position wherein said two walls are disposed in more closely adjacent relation to each other prior to said cutting of said fins.
Claim 26
Dependent Claim
43 words
The method as defined in claim 5, and in which a. said flattening of said tubular member is performed to an extent wherein, during the subsequent cutting of fins from said ribs, said two walls are disposed in abutting engagement with each other.
Claim 27
Independent Claim
16 words
The method of making a heat transfer element comprising a. forming an elongated tubular member having
Claim 28
Independent Claim
16 words
The method of making a heat transfer element comprising a. forming an elongated tubular member having
Claim 29
Dependent Claim
16 words
The method defined in claim 7, and in which a. said expanding means comprises a mandrel.
Claim 30
Dependent Claim
41 words
The method defined in claim 7, and a. which includes flattening said tubular member into position wherein said two walls are disposed in more closely adjacent relation to each other prior to said cutting of said spines, and b. in which
Claim 31
Dependent Claim
16 words
The method defined in claim 7, and in which a. said expanding means comprises working fluid.
Claim 32
Dependent Claim
57 words
The method defined in claim 10, and which includes a. clampingly holding spaced opposite end portions of said tubular member during said passing of said working fluid into said tubular member to thereby restrain said end portions against said expansion and thereby limit said expansion to the portion of said tubular member disposed between said end portions.
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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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |