US3789494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of spirally winding strip to produce pinned units
Assignee: Linde Sverige AB
•
Filing: 1972-04-24
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Granted: 1974-02-05
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Expires: 1992-04-24
Abstract
Abstract A design of finned units, intended for example for thermal regenerators, heat exchangers or burners for liquid fuel. The finned units are manufactured by simultaneous spiral winding of a strip forming fins and a spacer element forming a distance between the fins. The spacer elements are wholly or partially removed when fixing elements have been introduced in a number of holes distributed about the circumference. The cross-sectional area of each fixing element is equal to or smaller than the cross-sectional area of the corresponding holes in the fins. As a consequence thereof each fixing element prevents movement of the fins exclusively in a plane perpendicular to said fixing element.
Inventors
- 👤 S Knoos
- 👤 B Bostrom
- 👤 S Ljungdahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:49
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/027; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49357; Y10T29/4981
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
149 words
In a method for manufacture of finned units comprising simultaneously spirally winding at least one fin-forming strip and at least one spacer element such that the spacer element spaces adjacent turns of the strip radially, the improvement comprising securing the turns of the winding in this radially spaced relationship by passing elongate fixing elements through a number of radially aligned holes in the turns of said strip at plural locations about the circumference of the spirally wound strip, the cross sectional area of each fixing element within a range encompassing several successive strip turns being not greater than the cross-sectional area of the corresponding holes in the strip such that each fixing element prevents movement of the strip turns exclusively in a plane perpendicular to the fixing element, and removing at least part of said spacer element from between at least some of the adjacent turns of the strip.
Claim 2
Dependent Claim
149 words
In a method for manufacture of finned units comprising simultaneously spirally winding at least one fin-forming strip and at least one spacer element such that the spacer element spaces adjacent turns of the strip radially, the improvement comprising securing the turns of the winding in this radially spaced relationship by passing elongate fixing elements through a number of radially aligned holes in the turns of said strip at plural locations about the circumference of the spirally wound strip, the cross sectional area of each fixing element within a range encompassing several successive strip turns being not greater than the cross-sectional area of the corresponding holes in the strip such that each fixing element prevents movement of the strip turns exclusively in a plane perpendicular to the fixing element, and removing at least part of said spacer element from between at least some of the adjacent turns of the strip.
Claim 3
Dependent Claim
35 words
Method as claim in claim 1 wherein the cross-sectional area of each fixing element within a range encompassing several successive strip turns is less than the cross-sectional area of the corresponding holes in the strip.
Claim 4
Dependent Claim
24 words
Method as claimed in claim 1 wherein enough of the spacer element is removed to provide axially open passages between some of the turns.
Claim 5
Dependent Claim
49 words
Method as claimed in claim 3 wherein at least two fin-forming strips and a corresponding number of spacer elements are Wound about the same center at the same time and in the same radial plane, and at least one of said spacer elements is removed and one is retained.
Claim 6
Dependent Claim
27 words
Method as claimed in claim 4 wherein the spacer elements between every second turn are removed, the spacer elements between the other turns being retained in position.
Claim 7
Dependent Claim
42 words
Method as claimed in claim 5 wherein the retained spacer elements are axially spaced from each other in said other turns so as to form flow paths therein transverse to the axial flow paths formed by removal of said every second turn.
Claim 8
Dependent Claim
24 words
Method as claimed in claim 6 further comprising communicating the flow paths defined by the retained spacer elements with at least one radial pipe.
Claim 9
Dependent Claim
25 words
Method as claimed in claim 4 wherein the retained spacer element comprises at least two axially spaced spacer elements forming between them a flow passage.
Claim 10
Dependent Claim
29 words
Method as claimed in claim 8 wherein the retained spacer element comprises at least three axially spaced spacer elements forming between them at least two axially separated flow paths.
Claim 11
Dependent Claim
62 words
Method as claimed in claim 4 wherein three fin forming strips and three spacer elements are wound about the same center at the same time and in the same radial plane, and one of said spacer elements is removed and the other two are retained, the retained spacer elements each comprising two axially spaced spacer elements defining between them a flow path.
Claim 12
Dependent Claim
40 words
Method as claimed in claim 5 wherein the turns from which the spacer element is removed are open for fluid flow axially therethrough and the turns in which the spacer element is retained are communicated with a liquid fuel supply.
Claim 13
Dependent Claim
23 words
Method as claimed in claim 11 wherein capillary pumping means are provided in the turns which are communicated with a liquid fuel supply.
Claim 14
Dependent Claim
46 words
Method as claimed in claim 1 wherein at least two fin-forming strips are wound up at the same time about substantially the same center in different axial planes but with mutual overlapping relationship such that one strip serves as a spacer element for the adjacent strip.
Claim 15
Dependent Claim
18 words
Method as claimed in claim 1 comprising arranging a plurality of the finned units axially adjacent each other.
Claim 16
Dependent Claim
24 words
Method as claimed in claim 14 wherein the adjacent units are axially separated by appreciably less than the axial width of the individual units.
Claim 17
Dependent Claim
17 words
Method as claimed in claim 1 wherein said spacer element is in the form of a wire.
Claim 18
Dependent Claim
20 words
Method as claimed in claim 1 wherein at least two axially spaced spacer elements are wound with the fin-forming strip.
References Cited (Backward Citations)
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US3031360A
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US3367406A
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US3477496A
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |