Patent US3673845A successfully refreshed from Google Patents.
US3673845A
Expired / Lapsed
US
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Tensile bending of metal panels or strip having inflatable passageways
Assignee: Olin Corp
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Filing: 1969-11-25
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Granted: 1972-07-04
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Expires: 1989-11-25
Abstract
Abstract A process for bonding metal strip or panels containing inflatable passageways, wherein the passageway may be uninflated, partially inflated, preformed, or fully inflated. The strip or panels are eventually fully inflated to form one or more fluid passageways. The strip or panel is maintained under tension and is bent by contacting it with a die spindle while it is under tension. The strip or panel will be forced ahead and around the die spindle, thus creating elongation. Upon completion of the bend, the strip or panel may be inflated using air, water, or any other inflation medium. The inflation can be accomplished while the strip or panel is still under tension, or they may be freely inflated after removal of the tension. An apparatus for carrying out the process comprises a die spindle shaped to substantially mate with the strip or panel which is to be bent. The die spindle is secured to a rotatable bending arm, which is adapted to traverse the die spindle through an arc, which intercepts the strip or panel, forcing the strip or panel ahead and around the die spindle. The apparatus also contains means for 4879888X tension to the strip or panel while it is being bent. The tension is preferably slightly less than the yield strength at 0.2 percent offset of the strip or panel. The apparatus is also capable of automatic and continuous operation and is ideally suited to the formation of serpentine-like configurations for use in heat exchangers.
Inventors
- 👤 John W Vercoglio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:08
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/06; B21D11/07; B21D53/00; B21D53/02; B21D53/04; B21D53/045; Y; Y10; Y10S; Y10S29/00; Y10S29/042; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49391
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
55 words
A process of bending metal panels or strip having at least one passageway, comprising: providing a metal panel or strip having at least one passageway, applying a tensile stress to said panel or strip, and then bending said panel or strip a given amount about a die spindle while it is under said tensile stress.
Claim 2
Dependent Claim
55 words
A process of bending metal panels or strip having at least one passageway, comprising: providing a metal panel or strip having at least one passageway, applying a tensile stress to said panel or strip, and then bending said panel or strip a given amount about a die spindle while it is under said tensile stress.
Claim 3
Dependent Claim
30 words
A process as in claim 1, wherein said at least one passageway comprises an inflatable fluid passageway and wherein said panel or strip has a plurality of inflatable fluid passageways.
Claim 4
Dependent Claim
26 words
A process as in claim 1, wherein said tensile stress applied is less than the yield strength at 0.2 percent offset of said panel or strip.
Claim 5
Dependent Claim
18 words
A process as in claim 1, wherein said panel or strip is bent between about 15* and 270*.
Claim 6
Dependent Claim
15 words
A process as in claim 1, wherein said panel or strip is bent about 180*.
Claim 7
Dependent Claim
18 words
A process as in claim 2, wherein said panel or strip is inflated subsequent to the bending step.
Claim 8
Dependent Claim
18 words
A process as in claim 6, wherein said panel or strip is inflated while it is under tension.
Claim 9
Dependent Claim
109 words
A process of bending metal panels or strip having at least one passageway, comprising: providing a panel or strip having at least one passageway, defined by a stop-weld pattern said panel or strip comprising at least two sheets of metal with said stop-weld pattern sandwiched between them, said sheets being pressure welded together except in the regions of the stop-weld pattern, applying a tensile stress to said panel or strip, said tensile stress being less than the yield strength at 0.2 percent offset of said panel or strip, and then bending said panel or strip a given amount about a die spindle while it is under said tensile stress.
Claim 10
Dependent Claim
109 words
A process of bending metal panels or strip having at least one passageway, comprising: providing a panel or strip having at least one passageway, defined by a stop-weld pattern said panel or strip comprising at least two sheets of metal with said stop-weld pattern sandwiched between them, said sheets being pressure welded together except in the regions of the stop-weld pattern, applying a tensile stress to said panel or strip, said tensile stress being less than the yield strength at 0.2 percent offset of said panel or strip, and then bending said panel or strip a given amount about a die spindle while it is under said tensile stress.
Claim 11
Dependent Claim
20 words
A process as in claim 8, wherein said panel or strip, which is provided, has a plurality of fluid passageways.
Claim 12
Dependent Claim
33 words
A process as in claim 8, wherein the tensile stress which is applied is greater than 1,000 p.s.i. and less than the yield strength at 0.2 percent offset of said panel or strip.
Claim 13
Dependent Claim
29 words
A process as in claim 10, wherein the tensile stress which is applied is slightly less than the yield strength at 0.2 percent offset of said panel or strip.
Claim 14
Dependent Claim
17 words
A process as in claim 8, wherein the diameter of the bend is less than 3 inches.
Claim 15
Dependent Claim
13 words
A process as in claim 12, wherein the strip is bent about 180*.
Claim 16
Dependent Claim
29 words
A process as in claim 8, wherein the panel or strip is inflated at said stop-weld pattern subsequent to the bending step, to provide at least one fluid passageway.
Claim 17
Dependent Claim
20 words
A process as in claim 14, wherein the panel or strip is inflated while it is under said tensile force.
Claim 18
Dependent Claim
22 words
A process as in claim 15, wherein said panel or strip is inflated using air pressure ranging from 100 to 3,000 p.s.i.g.
Claim 19
Dependent Claim
31 words
A process as in claim 8, wherein the panel or strip is bent by forcing it around a die spindle which is contoured to substantially mate with said panel or strip.
Claim 20
Independent Claim
76 words
An apparatus for bending a metal panel or strip having at least one inflatable fluid passageway, comprising: tensioning means, contacting the panel or strip, being operative to place the panel or strip under tension prior to bending, bending means, contacting the panel or strip, being operative to bend only a portion of the panel or strip while it is under tension, and inflation means, contacting the panel or strip, being operative to inflate said fluid passageway.
Claim 21
Independent Claim
76 words
An apparatus for bending a metal panel or strip having at least one inflatable fluid passageway, comprising: tensioning means, contacting the panel or strip, being operative to place the panel or strip under tension prior to bending, bending means, contacting the panel or strip, being operative to bend only a portion of the panel or strip while it is under tension, and inflation means, contacting the panel or strip, being operative to inflate said fluid passageway.
Claim 22
Dependent Claim
59 words
An apparatus as in claim 18, wherein the tensioning means comprises a clamp attached to one end of the panel or strip and drag means contacting the panel or strip at a point along its length, said drag means being operative to maintain the panel or strip, which is held between said drag means, and said clamp, under tension.
Claim 23
Dependent Claim
26 words
An apparatus as in claim 19, wherein the amount of tension is less than the yield strength at 0.2 percent offset of the panel or strip.
Claim 24
Dependent Claim
37 words
An apparatus as in claim 20, wherein the bending means comprises a die spindle which contacts the panel or strip, said die spindle being operative to force the panel or strip ahead and around said die spindle.
Claim 25
Dependent Claim
58 words
An apparatus as in claim 21, wherein the die spindle is secured to a bending arm which is pivotable about a fixed point, said bending arm being operative when rotated to traverse said die spindle through an arc which intercepts the panel or strip such that the panel or strip is forced ahead and around said die spindle.
Claim 26
Dependent Claim
30 words
An apparatus as in claim 22, wherein said die spindle has a surface which is contoured to substantially mate with the surface of the panel or strip which it contacts.
Claim 27
Dependent Claim
24 words
An apparatus as in claim 23 wherein said inflation means is operative to inflate said passageway in the strip while it is under tension.
Claim 28
Independent Claim
92 words
An apparatus for bending a metal strip having at least one inflatable fluid passageway to form a serpentine configuration comprising: tensioning means, contacting the strip being operative to place the strip under tension less than the yield strength at 0.2 percent offset of the strip prior to bending, a first bending means contacting the strip, being operative to bend the strip in one direction while it is under tension, a second bending means, contacting the strip, being operative to bend the strip in an opposite direction while the strip is under tension.
Claim 29
Independent Claim
92 words
An apparatus for bending a metal strip having at least one inflatable fluid passageway to form a serpentine configuration comprising: tensioning means, contacting the strip being operative to place the strip under tension less than the yield strength at 0.2 percent offset of the strip prior to bending, a first bending means contacting the strip, being operative to bend the strip in one direction while it is under tension, a second bending means, contacting the strip, being operative to bend the strip in an opposite direction while the strip is under tension.
Claim 30
Dependent Claim
55 words
An apparatus as in claim 25, wherein said tensioning means comprises a clamp clamping the strip at one point along its length and drag means contacting the strip at another point along its length, said drag means being operative to maintain the strip which is held between said drag means and said clamp under tension.
Claim 31
Dependent Claim
27 words
An apparatus as in claim 26, wherein the amount of tension is between about 1,000 p.s.i. and the yield strength at 0.2 percent offset of the strip.
Claim 32
Dependent Claim
23 words
An apparatus as in claim 27, wherein the tension is slightly less than the yield strength at 0.2 percent offset of said strip.
Claim 33
Dependent Claim
35 words
An apparatus as in claim 27, wherein said first bending means comprises a first die spindle which contacts the strip, said die spindle being operative to force the strip ahead and around said die spindle.
Claim 34
Dependent Claim
35 words
An apparatus as in claim 29, wherein said second bending means comprises a second die spindle which contacts the strip, said die spindle being operative to force the strip ahead and around said die spindle.
Claim 35
Dependent Claim
144 words
An apparatus as in claim 30, wherein said first die spindle is secured to a first bending arm which is rotatable about a first fixed point in a first direction, said first bending arm being operative when rotated in said first direction to traverse said first die spindle through an arc which intercepts the strip such that the strip is forced ahead and around said first die spindle, and wherein said second die spindle is secured to a second bending arm which is rotatable about a second fixed point in a second direction which opposes said first direction, said second bending arm being operative when rotated in said second direction to traverse said second die spindle through a second arc which intercepts the strip such that the strip is forced ahead and around said second die spindle, so as to form a serpentine configuration.
Claim 36
Dependent Claim
31 words
An apparatus as in claim 31, wherein said first and second die spindles have surfaces which are contoured to substantially mate with the respective surface of the strip which they contact.
Claim 37
Dependent Claim
23 words
An apparatus as in claim 32, further including inflation means contacting the strip, said inflation means being operative to inflate said fluid passageway.
Claim 38
Dependent Claim
42 words
An apparatus as iN claim 32, including control means being operative to sequence the operation of the apparatus such that said first bending means and said second bending means are operated alternately whereby the strip may be formed into a serpentine configuration.
Claim 39
Dependent Claim
24 words
An apparatus as in claim 33 wherein said inflation means is operative to inflate said passageway in said strip while it is under tension.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |