US3859839A - System and device for avoiding any change of the cross section of tubular bodies during their cold bending - Google Patents

System and device for avoiding any change of the cross section of tubular bodies during their cold bending Download PDF

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Publication number
US3859839A
US3859839A US377732A US37773273A US3859839A US 3859839 A US3859839 A US 3859839A US 377732 A US377732 A US 377732A US 37773273 A US37773273 A US 37773273A US 3859839 A US3859839 A US 3859839A
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US
United States
Prior art keywords
pipe
shanks
mandrel
section
width
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
Application number
US377732A
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English (en)
Inventor
Piero Crotti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CAMAR SA
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CAMAR SA
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Filing date
Publication date
Application filed by CAMAR SA filed Critical CAMAR SA
Application granted granted Critical
Publication of US3859839A publication Critical patent/US3859839A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
    • 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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material

Definitions

  • a bending mandrel for pipe comprises a flat elongated [:2] :LS. C!l.
  • the present invention relates to a pipe-bending mandrel.
  • a pipe-bending mandrel or core preferably molded from a synthetic resin such as polyethylene or nylon, has a flattened elongated configuration and consists of a pair of terminal members interconnected by longitudinally extending shanks which define a longitudinally extending throughgoing slot between them.
  • the slot is defined between parallel walls of the shanks while the shanks are of increasing cross-section from their terminal members to the center so that, upon insertion of the mandrel into the pipe, the shanks are deflected inwardly and at the bend lie almost in abutting relationship so that the solid width of the deformed mandrel at its center substantially equals the corresponding width of the pipe.
  • FIG. 1 is an elevational view of the device in its relaxed position
  • FIG. 2 is a longitudinal section taken along the line A A of FIG. 1;
  • FIG. 3 shows the device in elevation as it is about to be inserted into a pipe
  • FIG. 4 is a view of the pipe in section with the device fully inserted and the shanks compressed.
  • FIG. 5 is a section similar to FIG. 2 through the bent pipe with the device in place.
  • a bending mandrel which comprises a pair of terminal members 3a of rectangular configuration, bridged by a pair of shanks 3 which define a longitudinal slot 4 between them.
  • the inner faces of the shanks, defining the slot, are parallel as can be seen in FIG. 1 while the outer walls are tapered toward the ends of the mandrel l to impart the progressively increasing cross-section to the shanks to the center plane B B which lies transversely to the longitudinal dimension of the device.
  • the mandrel 1, being flattened as may be seen from FIGS. 1 and 2, can be readily bent from the longitudinal plane C C, but resists bending within this plane.
  • the mandrel 1 has a relaxed width at its center plane B B which exceeds the internal diameter or width of the pipe 2 into which it is to be inserted, but a terminal width which may be slightly less than this diameter to permit ease of insertion.
  • the central plane B B lies at the bend and the shanks are bowed inwardly substantially into contact with one another so that the solid compressed width of the mandrel is approximately equal to the corresponding dimension of the tube.
  • the tube may now be bent (FIG. 5) without collapse of the pipe (see FIG. 5).
  • a pipe-bending mandrel receivable in a pipe of a predetermined diameter to permit bending thereof without collapse said mandrel comprising a flat elongated body having a pair of terminal members of a width less than said diameter, and] a pair of elongated shanks interconnecting said members and defining between them a longitudinally-extended throughgoing slot, said shanks having inner parallel walls defining said slot in a relaxed position of said body outside said pipe, but being of increasing cross-section from said members toward the center of said body whereby upon inward deflection of said shanks, the solid width of said body at said center corresponds substantially to the diameter of said pipe, the width of said body in a relaxed condition thereof external of said. pipe being greater than said diameter at said center.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US377732A 1972-09-18 1973-07-09 System and device for avoiding any change of the cross section of tubular bodies during their cold bending Expired - Lifetime US3859839A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT52811/72A IT965396B (it) 1972-09-18 1972-09-18 Sistema e dispositivo per mante mere in alterata la sezione tra sversale di corpi tubolari du rante una operazione di incurva mento a freddo

Publications (1)

Publication Number Publication Date
US3859839A true US3859839A (en) 1975-01-14

Family

ID=11277645

Family Applications (1)

Application Number Title Priority Date Filing Date
US377732A Expired - Lifetime US3859839A (en) 1972-09-18 1973-07-09 System and device for avoiding any change of the cross section of tubular bodies during their cold bending

Country Status (14)

Country Link
US (1) US3859839A (es)
JP (1) JPS4970863A (es)
AR (1) AR197995A1 (es)
AT (1) AT327640B (es)
AU (1) AU6014373A (es)
BE (1) BE803178A (es)
CH (1) CH570213A5 (es)
DE (1) DE2346103A1 (es)
ES (1) ES194925Y (es)
FR (1) FR2200065B1 (es)
IT (1) IT965396B (es)
LU (1) LU68193A1 (es)
NL (1) NL7312378A (es)
ZA (1) ZA734924B (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040069040A1 (en) * 2002-10-10 2004-04-15 Kazuhiko Nakazato Bending method and mandrel of multi-layered pipe
US9694413B2 (en) 2009-03-19 2017-07-04 Magna International Inc. Method of producing tailored tubes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT232332Y1 (it) * 1994-02-22 1999-12-17 Borletti Climatizzazione Attrezzatura per la piegatura a u di tubi per scambiatori di calore muniti di alette radiali sporgenti dalla parete interna del tubo.
DE102014107389A1 (de) * 2014-05-26 2015-11-26 Viega Gmbh & Co. Kg Innenbiegewerkzeug für Rohre

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US179130A (en) * 1876-06-27 Improvement in pipe-bending mandrels
US425395A (en) * 1890-04-08 Pipe-bending core
US2729265A (en) * 1951-12-20 1956-01-03 Boeing Co Articulated metal forming tool

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1654697A (en) * 1925-10-17 1928-01-03 Adolph Mueller Pipe-bending mandrel
DE955018C (de) * 1954-02-26 1956-12-27 Ludwig Lang Biegsamer Dorn zum Biegen von Rohren
GB837462A (en) * 1957-12-02 1960-06-15 Gen Electric Co Ltd Improvements in or relating to waveguides and methods of bending waveguides
GB845241A (en) * 1957-12-02 1960-08-17 Gen Electric Co Ltd Improvements in or relating to waveguides and methods of bending waveguides
US3279237A (en) * 1963-05-20 1966-10-18 Mueller Brass Co Mandrel for bending tubing
US3580044A (en) * 1969-03-24 1971-05-25 Edwin A De Voss Tube bending mandrel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US179130A (en) * 1876-06-27 Improvement in pipe-bending mandrels
US425395A (en) * 1890-04-08 Pipe-bending core
US2729265A (en) * 1951-12-20 1956-01-03 Boeing Co Articulated metal forming tool

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040069040A1 (en) * 2002-10-10 2004-04-15 Kazuhiko Nakazato Bending method and mandrel of multi-layered pipe
US7131313B2 (en) * 2002-10-10 2006-11-07 Sanoh Industrial Co., Ltd. Bending method and mandrel of multi-layered pipe
US9694413B2 (en) 2009-03-19 2017-07-04 Magna International Inc. Method of producing tailored tubes

Also Published As

Publication number Publication date
ES194925U (es) 1975-01-01
FR2200065B1 (es) 1978-01-27
IT965396B (it) 1974-01-31
ZA734924B (en) 1974-06-26
AT327640B (de) 1976-02-10
DE2346103A1 (de) 1974-03-28
LU68193A1 (es) 1973-10-16
AR197995A1 (es) 1974-05-24
ES194925Y (es) 1975-06-01
BE803178A (fr) 1973-12-03
AU6014373A (en) 1975-03-13
CH570213A5 (es) 1975-12-15
ATA720173A (de) 1975-04-15
JPS4970863A (es) 1974-07-09
NL7312378A (es) 1974-03-20
FR2200065A1 (es) 1974-04-19

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