US3705604A - Device for bending metallic tubes and in bent metallic tubes - Google Patents

Device for bending metallic tubes and in bent metallic tubes Download PDF

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Publication number
US3705604A
US3705604A US10395A US3705604DA US3705604A US 3705604 A US3705604 A US 3705604A US 10395 A US10395 A US 10395A US 3705604D A US3705604D A US 3705604DA US 3705604 A US3705604 A US 3705604A
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US
United States
Prior art keywords
tube
bent
curvature
tool
bending
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
US10395A
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English (en)
Inventor
Georges Christin
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.)
Faurecia Sieges dAutomobile SAS
Original Assignee
Bertrand Faure SA
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Filing date
Publication date
Application filed by Bertrand Faure SA filed Critical Bertrand Faure SA
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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
    • B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies

Definitions

  • the present invention relates to devices for bending or curving metallic tubes in the cold around a relatively sharp angle, that is to say around a curve of small radius of curvature, comprising, on one hand, two members intended to receive a tube and, on the other hand, a tool adapted to be supported under the action of an external force, on a portion of the tube comprised between said two support members, so as to bend this tube whilst deforming its cross-section.
  • the invention relates also to metallic tubes bent around a curve of small radius of curvature by means of these devices, as well as assemblies or frameworks composed at least in part of such bent tubes.
  • the invention applies more particularly, but'not exclusively', to the casewhere the bent tubes concerned serve for constituting frame works for beds, tables, seats or other articles, and especially frame works for vehicle seats.
  • the tool concerned forced the metal of the tube located in the concave portion of the bend towards the inside of said tube so as to give the transverse cross-section of this concave portion the form of an inset V.
  • Tubes thus bent and deformed have small mechanical strengths, especially to torsion and to flexion, particularly in the direction of reopening the angle of bending, by reason of the tendency to tearing and cracking of the zones, of the concave portion of the bend, which have been rendered fragile by the deformation (zones generally located at the tip and at the apices of the V).
  • a device of the type concerned wherein the tool is arranged so that the surface of its active portion coming into contact with the tube on bending has a median groove and two ribs bounding this groove, the said groove and the said ribs extending around the longitudinal direction of the tube after bending.
  • metallic tubes bent so as to comprise at the concave portion of their elbows, a longitudinal median rib bounded by two ledges.
  • the sections of the tube which are attached to its bent portion have a circular cross-section; the width of the groove fashioned in the active portion of the tool, (and hence that of the rib formed in the elbow of the tube) may be of the order of one third of the outer diameter of the tube.
  • FIG. 1 shows diagrammatically in section a device for bending tubes, constructed according to the invention, in its position corresponding to the beginning of the operation of bending a tube;
  • FIG. 2 is a view, from above of the embodiment of the device shown in FIG. 1;
  • FIG. 3 shows, in side view, the same embodiment at the end of the bending operation
  • FIG. 4 shows, in side view, a metallic tube, bent, ac-
  • FIG. 5 lastly, is a partial section along the line V-V of FIG. 3 of the tool and of the bent tube spaced from one another.
  • two support members 1 such as cradles, or again grooved rollers mounted on parallel axes of rotation 2, located at an adjustable distance D from one another (FIG. 1), which members are arranged transversely with regard to one another, that is to say both corresponding to a same transverse plane of symmetry P,
  • a tool 3 located generally at an equal distance from the members 1, above these members, corresponding to two planes of symmetry: a first plane merging with the plane P and a second plane 0 equidistant from the axes 2 and perpendicular to the intersection of the plane P and the plane containing the said V axes,
  • a cylindrical metallic tube 4 to be bent is placed under the said tool 3, on the members 1 where it rests by two contact zones. Between these zones extends a portion 6 of the tube, of length substantially equal to the distance D, which is free of any support.
  • the middle line 7 of the tube is hence situated in the plane P.
  • the members 1 and the tube 4 are then actuated so that the said tool comes to bear on the median region of the portion 6 of the tube and to bend, in the cold, this tube 4 at this spot whilst deforming its section.
  • the middle line 7 of the tube curves inward but remains in the plane P.
  • transverse direction a direction orthogonal to the middle line of the tube and by transversal section, a section through a plane perpendicular to the middle line of the tube.
  • the form of the tool 3 was such that it produced a single very deep hollow, elongated longitudinally in the central zone of the concave portion of the bent tube and the elbow thus obtained was relatively fragile, cracking or breaking fairly easily in its very deformed zones.
  • the median groove 9 may have a transverse section of various shape but has preferably the shape of an arc of a circle, asshown in FIG. 5, which shape avoids sharp angles.
  • the ribs 10 and 11 have a transverse section of small curvature, of sign opposite to that of the curvature of the groove 9.
  • the widths of the groove and of the ribs are substantially equal and for example of the order of one third of the outer diameter of the tube each.
  • the whole of the active portion of the tool 3 coming into contact with the tube may have the shape of a grooved pulley.
  • the depth of the groove 9 may be such that after bending there exists a free space between the bottom of the said groove and the surface of the tube 4 included in this groove, but it is preferred that said bottom of the groove is closely applied against the tube after bending to avoid any risk of folding of this tube opposite this bottom by guiding it completely until the end of deformation.
  • the form of the tool 3 is selected so as to facilitate or at least to render possible disengagement of this tool out of the concave portion 14 of the bent tube: it is also to enable this disengagement that the angle of bending will be limited in practice to l60l70 or, in other terms, that the angle of the elbow obtained will not be less than 10 or
  • the tube 4 obtained after bending has, in the concave portion 14 of its elbow, the impression of the surface 8 of the active portion of the tool, that is to say a longitudinal median rib 15 bounded by two ledges 16 and 17.
  • the arms of the elbow form an angle equal to
  • the tube used is of steel and, for example, its outer diameter is equal to 20 mm and its thickness to A s s fated above, the average order of magnitude of the radius of curvature R of the middle line of the bent portion of the tube is the same as that of the diameter D of the tube: the said radius of curvature is preferably comprised between the said diameter and double this diameter.
  • the invention is not at all limited to those of its methods of application and of production, whichhave been more particularly described; it embraces, on the contrary, all variations, especially those in which the tool 3 is constituted by two flanges, particularly circularly, of which the periphery forms ribs 10 and 11, said flanges being held parallel and separated from one another by a distance equal to the width of the groove 9;
  • a metallic tube according to claim 2 its diameter being comprised between the radius of curvature of its bend and half of said radius of curvature.
  • a metallic tube according to claim 1 bent into an elbow of about 10 to about 90.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Food-Manufacturing Devices (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US10395A 1969-02-11 1970-02-11 Device for bending metallic tubes and in bent metallic tubes Expired - Lifetime US3705604A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6903189A FR2031867A5 (ru) 1969-02-11 1969-02-11

Publications (1)

Publication Number Publication Date
US3705604A true US3705604A (en) 1972-12-12

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ID=9028908

Family Applications (1)

Application Number Title Priority Date Filing Date
US10395A Expired - Lifetime US3705604A (en) 1969-02-11 1970-02-11 Device for bending metallic tubes and in bent metallic tubes

Country Status (10)

Country Link
US (1) US3705604A (ru)
BE (1) BE745688A (ru)
CA (1) CA937147A (ru)
DE (1) DE2006109C3 (ru)
ES (1) ES376430A1 (ru)
FR (1) FR2031867A5 (ru)
GB (1) GB1306088A (ru)
NL (1) NL147347B (ru)
SE (1) SE348124B (ru)
SU (1) SU392633A3 (ru)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040189059A1 (en) * 2003-03-28 2004-09-30 Yang Jian Hui Chair with bight formed in leg
US20040250599A1 (en) * 2003-06-13 2004-12-16 Larry Shed Tubing bending machine
US20110121639A1 (en) * 2008-05-12 2011-05-26 Takaaki Fukushi Press-forming method of tubular part having cross section of irregular shape, and tubular part having cross section of irregular shape formed by the press-forming method
US9937837B2 (en) * 2015-03-05 2018-04-10 Toyota Boshoku Kabushiki Kaisha Vehicle seat

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2011496A6 (es) * 1987-09-04 1990-01-16 Lane & Roderick Inc Procedimiento y aparato para formar cantos vivos en chapas metalicas.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285275A (en) * 1942-06-02 Bent tube section and a method of
US2880779A (en) * 1954-05-21 1959-04-07 Mingori Rene Pompeo Tube bending machine having reciprocating and pivoted benders
FR1311948A (fr) * 1961-10-30 1962-12-14 Procédé de fabrication de tubes cintrés ou en hélice de profil lenticulaire dissymétrique
US3464254A (en) * 1966-08-12 1969-09-02 Leslie Arthur Le Breton Pipe bending devices
US3472056A (en) * 1966-11-25 1969-10-14 Walker Mfg Co Pipe bending apparatus and method of bending

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285275A (en) * 1942-06-02 Bent tube section and a method of
US2880779A (en) * 1954-05-21 1959-04-07 Mingori Rene Pompeo Tube bending machine having reciprocating and pivoted benders
FR1311948A (fr) * 1961-10-30 1962-12-14 Procédé de fabrication de tubes cintrés ou en hélice de profil lenticulaire dissymétrique
US3464254A (en) * 1966-08-12 1969-09-02 Leslie Arthur Le Breton Pipe bending devices
US3472056A (en) * 1966-11-25 1969-10-14 Walker Mfg Co Pipe bending apparatus and method of bending

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040189059A1 (en) * 2003-03-28 2004-09-30 Yang Jian Hui Chair with bight formed in leg
US7036888B2 (en) * 2003-03-28 2006-05-02 Jian Hui Yang Chair with bight formed in leg
US20040250599A1 (en) * 2003-06-13 2004-12-16 Larry Shed Tubing bending machine
US20110121639A1 (en) * 2008-05-12 2011-05-26 Takaaki Fukushi Press-forming method of tubular part having cross section of irregular shape, and tubular part having cross section of irregular shape formed by the press-forming method
US8894080B2 (en) * 2008-05-12 2014-11-25 Nippon Steel & Sumitomo Metal Corporation Press-forming method of tubular part having cross section of irregular shape, and tubular part having cross section of irregular shape formed by the press-forming method
US9937837B2 (en) * 2015-03-05 2018-04-10 Toyota Boshoku Kabushiki Kaisha Vehicle seat

Also Published As

Publication number Publication date
SU392633A3 (ru) 1973-07-27
NL147347B (nl) 1975-10-15
NL7001909A (ru) 1970-08-13
BE745688A (fr) 1970-07-16
CA937147A (en) 1973-11-20
DE2006109C3 (de) 1974-11-07
DE2006109A1 (de) 1970-08-27
GB1306088A (ru) 1973-02-07
DE2006109B2 (de) 1974-04-18
FR2031867A5 (ru) 1970-11-20
SE348124B (ru) 1972-08-28
ES376430A1 (es) 1972-09-16

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