US3597956A - Apparatus for constructing a fin-and-tube heat exchanger having a bend formed therein - Google Patents
Apparatus for constructing a fin-and-tube heat exchanger having a bend formed therein Download PDFInfo
- Publication number
- US3597956A US3597956A US825473*A US3597956DA US3597956A US 3597956 A US3597956 A US 3597956A US 3597956D A US3597956D A US 3597956DA US 3597956 A US3597956 A US 3597956A
- Authority
- US
- United States
- Prior art keywords
- platen
- span
- fins
- coil
- relative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
- B21D53/085—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal with fins places on zig-zag tubes or parallel tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4935—Heat exchanger or boiler making
- Y10T29/49373—Tube joint and tube plate structure
- Y10T29/49375—Tube joint and tube plate structure including conduit expansion or inflation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4935—Heat exchanger or boiler making
- Y10T29/49377—Tube with heat transfer means
- Y10T29/49378—Finned tube
- Y10T29/4938—Common fin traverses plurality of tubes
Definitions
- Keenan Attorneys-Arthur 0. Andersen and Carl M. Lewis ABSTRACT A method and apparatus for constructing a finand-tube heat exchanger having a bend formed therein by bending the heat exchanger with apparatus which does not support or contact the heat exchanger fins at the situs of the bend, and a method for constructing a multirow fin-and-tube heat exchanger having a bend formed therein to facilitate the bending operation by initially expanding the tubes of only one row to fix the spacial relation of the fins during the bending step and allowing the tubes of the other rows to move freely relative to the fins during the bending operation, to thereby eliminate adverse distortion of the fins especially in the bend area.
- This invention relates to the art of fin-and-tube heat exchangers and particularly to those heat exchangers comprising a stack of generally planar parallel fins having a plurality of tubes extending normally therethrough.
- Such tubes may be disposed in a coplanar arrangement as in a one-row heat exchanger coil. Or, they may be arranged in two or more planes as in a two or more row coil. Often a two-row coil is preferred over a one-row coil for the reason that it requires less face area for the equivalent heat transfer surface.
- a fin-and-tube heat exchanger coil so that the coil lies generally along two or more intersecting planes.
- a refrigerant condenser coil so that it forms two or more sides of a rectangular condensing unit.
- Conventionally one-row coils of this type have been bent with tangent-type coil-bending machines.
- a tangenbtype bender fixedly clamps oneleg or end of the coil while a bending platen journaled at a fixed center is pivoted to wrap the other leg of the coil over a curved forming die located at the bight of the bend.
- a bend of final curvature progresses from one end toward the other end of the area to be bent.
- Another object is to provide a method and apparatus for bending a fin-and-tube heat exchange coil which does not require the application of external pressure on the fins in the bend area.
- This invention includes a method of constructing a fin-andtube heat exchange coil having a depth of at least two rows of tubes and bent to a predetermined angle comprising the steps of: providing a first plurality of generally straight first tubes; providing a second plurality olgencrally straight second tubes; providing a plurality of generally planar fins each having a first row of spaced first apertures adapted to receive and embrace a first row of tubes and a second row of spaced second apertures spaced from said first row of apertures adapted to receive and embrace a second row oftubes; arranging said fins in generally parallel superposed relation and positioning said first tubes within said first apertures and said second tubes within said second apertures thereby forming a fin-and-tube heat exchange coil having spaced first and second rows of tubes respectively whereby the tubes of said first row lie within a first plane and the tubes of said second row lie within a second plane parallel to and spaced a predetermined distance from said first plane; said tubes extending from one end to the other end of said heat exchange coil; fixed
- This invention further involves the apparatus for forming an arcuate bend of a predetermined angle in a fin-andtube heat exchange coil, said coil including a longitudinally extending tube with a plurality of fins disposed longitudinally therealong, said coil having a first section a second section spaced longitudinally from said first section, and a third section longitudinally intermediate said first and second sections, said apparatus comprising; a first platen fixedly connected to the fins of said first section; a second platen fixedly connected to the fins of said second section; means for pivoting said second platen relative to said first platen through the supplement of said predetermined angle about a central axis and simultaneously moving said axis through a curvilinear path whereby said third section is bent to said predetermined angle without the necessity of applying external pressure to the fins on said third section.
- FIG. 1 illustrates the step of arranging the fins on the tubes to form a two row heat exchange coil
- FlG.-2 is an enlarged sectional view of a-fragment ofthe coil of FIG. land illustrates the subsequent step of expanding the tubes of only one row prior to the step of bending the coil;
- FIG. 3 is a section taken at line 3-3 of FIG. 4 through a fin andtube heat exchanger coil bending machine incorporating aspects of the instant invention and showing the heat exchanger coil of FIG. 2 mounted therein ready for bending;
- FIG. 4 is a side elevation of the coil bending machine shown in FIG. 3;
- FIG. 5 is a view similar to FIG. 3 after the coil bending machine thereof has been moved through the bending step;
- FIG. 6 is a diagrammatic showing of the relative movement of the two platens of the coil bending machine shown in FIGS. 3-5 as the machine performs the step of bending the heat exchange coil of FIG. 2 and particularly showing the locus of instant centers of relative motion between the platens of the machine;
- FIG. 7 is a view similar to FIG. 3 showing a modified form of the coil-bending machine of FIG. 3;
- FIG. 8 is a view similar to FIG. 5 showing the modified coilbending machine after the bending step
- FIG. 9 is a view similar to FIG. 6 illustrating the relative platen movement for the modified coil-bending machine of FIGS. 7 and 8;
- FIG. I0 illustrates the step of expanding the tubes of all rows of the coil subsequent to the coil-bending step.
- FIGS. 1-6 and 10 there is shown a fin-and-tube heat exchange coil having a first row 11 of coplanar parallel laterally spaced tubes I2; a second row 13 of coplanar parallel laterally spaced tubes 14; and a plurality of generally planar rectangular relatively thin heat conductive fins 15 each having a first row 16 and a second row 17 of apertures 18 therein to receive respectively the tubes 12 and 14 of first and second tube rows 11 and 13.
- the fins 15 are stacked on the tubes in parallel generally spaced relationship. This stacking step is illustrated in FIG. 1.
- the tubes 12 and 14 may be inserted into the apertures 18 of the stacked fins I5.
- the one manner ofarranging the tubes with respect to the fins is considered the full equivalent of the other.
- the collar 19 at each aperture I8 is preferably in contact with an adjacent fin whereby the fins become substantially equally spaced prior to bending of the coil.
- the tubes 12 ofrow II are expanded within the apertures III of row [6 to secure a mechanical bond between the fins I5 and the tubes 12 of the first row of tubes. This is accomplished by passing a bullet 20 (FIG.
- coil-bending machine 21 has two stationary guide plate members 22 fixed in parallel spaced relation. lnterposed between guide members 22 are first-elongated platen 23 and second-elongated platen 24 each having a primary pressure bearing planar surface 25 for supporting a first face of the heat exchanger coil I0. Platens 23 and 24 are so arranged that surfaces 25 are initially coplanar and normal to guide members 22 as shown in FIGS. 3 and 4. Heat exchanger coil I0, following the aforementioned tube expanding step shown in FIG. 2, is laid upon and clamped to surfaces 25 via a clamp means 26 on each platen.
- Each clamp means may include a pair of legs 27 extending upwardly from surface 25 at the margins thereof and a clamp plate 28 extending between the free ends of legs 27 for the purpose of applying pressure on the other or second face of coil 10 via bolts 29.
- Each platen further includes an angle member 30 which presents a secondary pressure bearing surface at the ends of the tubes 12.
- Members 30 may be integral with or merely attached to the platens as desired.
- the platens 23 and 24 each have at their adjacent ends a pair of laterally projecting pins 3I which are slidably received in vertically extending guide slots 32 in guide members 22.
- the platens 23 and 24 each further have at their remote ends a pair of laterally projecting pins 33 which are slidably received in horizontally extending guide slots 34 in guide members 22.
- platens 23 and 24 may be rotatably guided by pins 31 and 33 and slots 32 and 34 from the position shown in FIG. 3 to the position shown in FIG. 5.
- a hydraulic power cylinder 35 anchored to guide members 22 by pin 36.
- the piston rod 37 of the hydraulic cylinder 35 may be pivotally connected to links 38 as by bolt 39 which links are in turn connected to adjacent ends of platens 23 and 24 at cars 40 as by pins 41. It will thus be appreciated that extension ofthe power cylinder piston rod 37 causes the platens to move from the position shown in FIG. 3 to their position shown in FIG. 5, thereby bending the heat exchanger coil 10 as shown in FIG. 5. It should be noted that it is not necessary that the platens 23 and 24 contact the fins at any point along the bend of the coil 10 and that there is no substantial movement of the platens relative to the coil fins clamped therein.
- the heat exchange coil bending machine 2] shown is constructed to provide coil 10 with up to a 90bend having a neutral axis plane N coinciding with the longitudinal axes of tubes I2.
- a neutral axis plane N coinciding with the longitudinal axes of tubes I2.
- pins 3] and 33 and slots 32 and 34 may be determined as follows.
- Pins 31 and 33 are located on platen 23 at points B and E respectively when the platen is in the position shown in FIG. 3.
- P-ins SI and 33 are located on platen 24 at points B and E respectively when the platen is in the position shown in FIG. 3.
- the straight vertical diverging slots or grooves 32 are formed in each of guide members 22 connecting between B and D, and B and D for guiding pins 3!.
- the straight horizontal slots or grooves 34 are formed in each of guide members 22 connecting between C and E, and C and E for guiding pins 33.
- the clamp plates 28 are removed and the bent coil I0 can be removed from machine 2
- the hydraulic power cylinder 35 may then be contracted to return the platens to their position of FIG. 3 for receiving another coil I0.
- may be designed for a slight over bend to compensate for the slight spring back that is often encountered in bending.
- FIG. 6 illustrates the movement of platen 24 relative to platen 23 during the bending step.
- Platen 24 rotates lA relative to platen 23 about an instant center moving relative to platen 23 along a locus or path P.
- Path P is substantially an arc of/A having a radius substantially equal to 1rR( I80A )/360and a center at S.
- the radius R of the coil bend from the central axis of curvature T to the neutral axis N is gradually reduced and the bend is effected simultaneously over the entire bend area as shown in FIG. 6.
- the tubes 14 of the outside row 13 are expanded such as by passing an expander bullet 42 therethrough as illustrated in FIG. to secure an efficient heat conductive mechanical connection especially in the bend area between the tubes I4 and fins 15.
- the tubes 12 of row I] are further expanded at this time with an expander bullet 43 also to secure an efficient heat conductive mechanical connection especially in the bend area between the tubes 12 and fins I5.
- Bullet 43 is several thousandths of an inch larger in diameter than first expander bullet 20.
- the ends of tubes 12 and I4 may then be appropriately connected to provide the desired heat exchanger coil circuits.
- the platen guide pins 31 and 33 may be transposedwith guide slots 32 and 34.
- the slots formed on the platen members would be curvilinear and thus more difficult to construct than the straight grooves 32 and 34 of FIGS. 3-5.
- the heat exchanger coil-bending'machine of FIGS. 3--5 may be simplified by substituting for the plural links 38 thereof a single link 38a for connecting the inner ends of the platens by pins 3Ia of the coil-bending machine 21a shown in FIGS. 7, 8 and 9.
- Platens 23a and 240 may be recessed at 44 to accommodate link 38a.
- the pins 31a are located on platens 23a and 240 (FIG. 7) at points G and G respectively for vertical movement in slots or grooves 32a on each of guide members 2211 which slots extend in parallel relation to vertical axis V from points G to points F and from points G to points F.
- Points F, F, G and G may located in the following manner:
- Link 380 is connected to a piston rod 370 of hydraulic cylinder 35a anchored by pin 36a to guide members-22a for driving movement of the platens 23a and 24a.
- the operation of the coil bending machine 21a is substantially the same as coil bending machine 21, During the heat exchange coil-bending step the machine elements of the modified form of the invention move from a position shown in FIG. 7 to a position shown in FIG. 8.
- platen 24a rotates l80-Arelative to platen 230 about an instant center moving relative to platen 23a along a locus or path 0.
- Path Q is substantially an arc of 90 VZA" having a radius equal to 1rR( I80A)/360and a center S coinciding with pin 3Ia of platen-23a as shown in FIG. 9.
- the platen guide pins 31a and 33 may be transposed with guide slots 32a and 34. Again, however, in such case, the slots formed on the platen members would be curvilinear and thus more difficult to construct than the straight grooves 32a and 34 of FIGS. 7 and 8.
- Apparatus for forming an arcuate bend of a predetermined angle in a fin-and-tube heat exchange coil said coil including a longitudinally extending tube with a plurality of fins disposed longitudinally therealong, said coil having a first section, a second section spaced longitudinally from said first section, and a third section longitudinally intermediate said first and second sections, said apparatus comprising: a first platen fixedly connected to the fins of said first section; a second platen fixedly connected to the fins of said second section; means for pivoting said second platen relative to said first platen through the supplement of said predetermined angle about an instant center and simultaneously moving said center relative to said first platen through a curvilinear path whereby said third section is bent to said predetermined angle without the necessity of applying external pressure to the fins on said third section.
- said means for pivoting said second platen relative to said first platen through the supplement of said predetermined angle about said instant center and simultaneously moving said center through a curvilinear path includes a pair of guide followers disposed at remote points on each of said platens, a straight guide surface operatively associated with each of said guide followers, and a guide member to support said guide surfaces in fixed relationship.
- Apparatus for forming an arcuate bend of a predetermined angle in a fin-and-tube heat exchange coil said coil including a first-elongated tube, a second-elongated tube, a plurality of fins each having first and second apertures receiving said first and second tubes respectively, said apparatus comprising: a first platen fixedly connected to the fins on a first span of said first tube; a second platen fixedly connected to the fins on a second span of said first tube remote from said first span; means for pivoting said second platen relative to said first platen through the supplement of said predetermined angle while the fins on said first and second spans are respectively fixedly secured to said first and second platens whereby the span of said first tube between said first and second spans is bent to said predetermined angle; and first and second means respectively fixed relative to said first and second platens for abutting and applying a longitudinal compressive force at the ends of first tube while said second platen is pivoted relative to said first platen; said apparatus having sufficient clearance with respect to
- Apparatus for forming a bend in the third span ofa workpiece having a first span, a second span spaced from said first span, and a third span interposed between said first and second spans comprising: a first platen adapted to be fixedly connected to said first span; a second platen adapted to be fixedly connected to said second span; means for pivoting said second platen relative to said first platen about an instant center and simultaneously moving said instant center relative to said first platen through a curvilinear path thereby forming a bend in said third span of said workpiece.
- Apparatus for forming a bend in the third span of an clongated workpiece having a first span, a second span spaced longitudinally from said first span, and a third span disposed longitudinally between said first and second spans comprising: a first-elongated platen adapted to be fixedly connected to said moving said instant center relative to said first platen along a path transverse to the longitudinal axis of said first platen.
Abstract
Description
Claims (7)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US82547369A | 1969-03-07 | 1969-03-07 |
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US3597956A true US3597956A (en) | 1971-08-10 |
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US825473*A Expired - Lifetime US3597956A (en) | 1969-03-07 | 1969-03-07 | Apparatus for constructing a fin-and-tube heat exchanger having a bend formed therein |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3731513A (en) * | 1971-07-08 | 1973-05-08 | Bell Telephone Labor Inc | Method and apparatus for bending an elongated object |
US3831420A (en) * | 1971-06-07 | 1974-08-27 | S Vodopoi | Method of bending heat exchanger sections and a machine for the realization thereof |
US3978704A (en) * | 1975-08-01 | 1976-09-07 | Rudolf Naumovich Fridman | Cone shell making machine |
US4351178A (en) * | 1979-08-02 | 1982-09-28 | Hitachi, Ltd. | Apparatus for bending a straight tube into a serpentine tube |
US4831856A (en) * | 1987-07-13 | 1989-05-23 | Tru-Cut Die Corp. | Heat exchanger coil bending apparatus and method |
US5267610A (en) * | 1992-11-09 | 1993-12-07 | Carrier Corporation | Heat exchanger and manufacturing method |
EP0927865A1 (en) * | 1997-12-30 | 1999-07-07 | Carrier Corporation | Multi-row heat exchanger |
US20130240187A1 (en) * | 2010-12-22 | 2013-09-19 | Sharp Kabushiki Kaisha | Heat exchanger and air conditioner equipped with same |
CN103861971A (en) * | 2014-02-28 | 2014-06-18 | 宁波德业科技集团有限公司 | Method for producing heat exchanger |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US1268844A (en) * | 1917-07-26 | 1918-06-11 | Kellogg M W Co | Pipe-bending machine. |
FR542614A (en) * | 1921-08-09 | 1922-08-18 | Boy Ferme & Cie | Multiple point reinforced concrete pile |
FR691187A (en) * | 1929-05-16 | 1930-10-02 | Tube and bar bending machine | |
US1923272A (en) * | 1930-11-19 | 1933-08-22 | Taylor Forge And Pipe Works | Method and means for forming pipe elbows |
US1964550A (en) * | 1930-07-07 | 1934-06-26 | Greenlee Bros & Co | Bender |
US2275174A (en) * | 1940-12-14 | 1942-03-03 | Verson Allsteel Press Co | Shell forming press |
US2525403A (en) * | 1947-09-17 | 1950-10-10 | Wallace Supplies Mfg Co | Bending machine |
GB700422A (en) * | 1951-07-19 | 1953-12-02 | Augustus George Chamberlain | Improvements in or relating to tube-bending machines |
US2892479A (en) * | 1955-10-27 | 1959-06-30 | Charles H Holsclaw | Pivoted sweeparm tube bender having bending shoe actuated by quadrilateral linkage |
US2942644A (en) * | 1955-09-21 | 1960-06-28 | American Radiator & Standard | Tube bending apparatus |
-
1969
- 1969-03-07 US US825473*A patent/US3597956A/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1268844A (en) * | 1917-07-26 | 1918-06-11 | Kellogg M W Co | Pipe-bending machine. |
FR542614A (en) * | 1921-08-09 | 1922-08-18 | Boy Ferme & Cie | Multiple point reinforced concrete pile |
FR691187A (en) * | 1929-05-16 | 1930-10-02 | Tube and bar bending machine | |
US1964550A (en) * | 1930-07-07 | 1934-06-26 | Greenlee Bros & Co | Bender |
US1923272A (en) * | 1930-11-19 | 1933-08-22 | Taylor Forge And Pipe Works | Method and means for forming pipe elbows |
US2275174A (en) * | 1940-12-14 | 1942-03-03 | Verson Allsteel Press Co | Shell forming press |
US2525403A (en) * | 1947-09-17 | 1950-10-10 | Wallace Supplies Mfg Co | Bending machine |
GB700422A (en) * | 1951-07-19 | 1953-12-02 | Augustus George Chamberlain | Improvements in or relating to tube-bending machines |
US2942644A (en) * | 1955-09-21 | 1960-06-28 | American Radiator & Standard | Tube bending apparatus |
US2892479A (en) * | 1955-10-27 | 1959-06-30 | Charles H Holsclaw | Pivoted sweeparm tube bender having bending shoe actuated by quadrilateral linkage |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3831420A (en) * | 1971-06-07 | 1974-08-27 | S Vodopoi | Method of bending heat exchanger sections and a machine for the realization thereof |
US3731513A (en) * | 1971-07-08 | 1973-05-08 | Bell Telephone Labor Inc | Method and apparatus for bending an elongated object |
US3978704A (en) * | 1975-08-01 | 1976-09-07 | Rudolf Naumovich Fridman | Cone shell making machine |
US4351178A (en) * | 1979-08-02 | 1982-09-28 | Hitachi, Ltd. | Apparatus for bending a straight tube into a serpentine tube |
US4831856A (en) * | 1987-07-13 | 1989-05-23 | Tru-Cut Die Corp. | Heat exchanger coil bending apparatus and method |
US5267610A (en) * | 1992-11-09 | 1993-12-07 | Carrier Corporation | Heat exchanger and manufacturing method |
EP0927865A1 (en) * | 1997-12-30 | 1999-07-07 | Carrier Corporation | Multi-row heat exchanger |
US20130240187A1 (en) * | 2010-12-22 | 2013-09-19 | Sharp Kabushiki Kaisha | Heat exchanger and air conditioner equipped with same |
CN103861971A (en) * | 2014-02-28 | 2014-06-18 | 宁波德业科技集团有限公司 | Method for producing heat exchanger |
CN103861971B (en) * | 2014-02-28 | 2015-11-18 | 宁波德业科技集团有限公司 | Heat exchanger production method |
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Owner name: CHEMICAL BANK, AS COLLATERAL AGENT, NEW YORK Free format text: ASSIGNMENT OF SECURITY INTEREST;ASSIGNOR:BANKERS TRUST COMPANY, AS COLLATERAL TRUSTEE;REEL/FRAME:006565/0753 Effective date: 19930601 |
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Owner name: AMERICAN STANDARD, INC., NEW JERSEY Free format text: RELEASE OF SECURITY INTEREST (RE-RECORD TO CORRECT DUPLICATES SUBMITTED BY CUSTOMER. THE NEW SCHEDULE CHANGES THE TOTAL NUMBER OF PROPERTY NUMBERS INVOLVED FROM 1133 TO 794. THIS RELEASE OF SECURITY INTEREST WAS PREVIOUSLY RECORDED AT REEL 8869, FRAME 0001.);ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:009123/0300 Effective date: 19970801 |
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Owner name: AMERICAN STANDARD, INC., NEW JERSEY Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:008869/0001 Effective date: 19970801 |