GB2318754A - Bending of elongate elements - Google Patents

Bending of elongate elements Download PDF

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Publication number
GB2318754A
GB2318754A GB9622234A GB9622234A GB2318754A GB 2318754 A GB2318754 A GB 2318754A GB 9622234 A GB9622234 A GB 9622234A GB 9622234 A GB9622234 A GB 9622234A GB 2318754 A GB2318754 A GB 2318754A
Authority
GB
United Kingdom
Prior art keywords
slit
elongate
bend
extending
cross
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.)
Withdrawn
Application number
GB9622234A
Other versions
GB9622234D0 (en
Inventor
James Neville Randle
Martin Jarrett
Andrew Rogers
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9622234A priority Critical patent/GB2318754A/en
Publication of GB9622234D0 publication Critical patent/GB9622234D0/en
Priority to GB9718708A priority patent/GB2318753A/en
Priority to DE69712465T priority patent/DE69712465D1/en
Priority to AU47104/97A priority patent/AU4710497A/en
Priority to PCT/GB1997/002800 priority patent/WO1998018580A1/en
Priority to EP97909413A priority patent/EP0876229B8/en
Publication of GB2318754A publication Critical patent/GB2318754A/en
Priority to NO19982914A priority patent/NO312657B1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
    • E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/18—Joggling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/08—Front or rear portions
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
    • E04C2003/0421—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section comprising one single unitary part
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
    • E04C2003/043—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the hollow cross-section comprising at least one enclosed cavity
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0465—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section square- or rectangular-shaped

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

An "H" shaped slit is cut in the top and bottom walls of a straight square section tube and a side force applied so that a and can be introduced. The slit is elongate and has end portion shaped to encourage the bending. After the bend has been introduced the gaps are filled.

Description

2318754 BENDING OF ELONGATE ELEMENTS
lle invention relates to the bending of a longitudinal portion of an elongate element, in particular of an element which is hollow and has a rigid wall. One specific use of the invention is the introduction of an inclined length at a point along an elongate metal element of generally box like cross-sectional shape.
It is one object of the invention to introduce a bend into such an element in a quick and low cost and accurate way.
According to the invention in one aspect there is provided a method of introducing a bend portion into a straight elongate hollow member, the method comprising the steps of.
1) cutting (i) an elongate slit in opposite side wall portions of the member, the slit extending substantially in the major axis of the member, and (ii) a slit in the region of the bend point, the slit extending between the wall portions and extending to overlie the wall portions.
2) removing a portion of metal between the cross slit and the elongate slit to allow movement of the walls of the elongate slit, and 2 3) applying a force to one side of the element and forward of the region of the cross-slit to introduce the bend.
While the invention may be applied to a hollow member of any crosssectional shape having two generally parallel faces, it is particularly useful to apply the invention to a member of box-section.
The method may be used to introduce one or more bends at different points along the length of the member.
According to a more specific aspect of the invention there is provided a method of forming a bend portion in an elongate straight element of hollow box section, the section having a floor and roof and opposite sidewalls, the method comprising: (i) forming aligned slits in the top and bottom walls of the section, the slits comprising a major slit extending generally in or parallel to the major axis between the intended ends of the bend portion and a slit at each end of the longitudinal slit, the end slits extending between the side walls and being inclined to the longitudinal axis and having at each end a portion which overfies the respective side wall, a generally triangular cut out being present at one end of each end slit, the trim portions being on opposite sides of the longitudinal slit and (ii) applying a force to one side of the portion to be bent to cause the portions on opposite sides of the longitudinal slit to slide with respect to each other.
3 In the method of the invention when the lateral force is applied to the precursor of the bend portion, one side of the element being held in a chuck or the like, the opposite sides of the longitudinal slit move in sliding fashion past one another diagonally across the element so that a triangular portion on one side is closed and another is opened up on the diagonally opposite side. At the end of the operation, the gaps between the opposite walls of the slits and the triangular portion may be filled m and the whole then smoothened, e.g. polished.
In order that the invention may be well understood it will now be described by way of example only with reference to the accompanying diagrammatic drawings, in which:
Figure 1 is a plan view of the box section tube before bending; Figure 2 is a cross-sectional view taken on lines H-II on Figure 1; Figure 3 is a plan view of the bending jig; and Figure 4 is a plan view of the tube after bending.
An elongate element E is a one piece extrusion made up of a floor 1, a roof 2, and opposite side walls 3, 4 to define a hollow box section. The extrusion is made of metal or alloy, or plastics or composite steel, or aluminium or the like. The sides of the extrusion are straight and parallel.
4 In the method of the invention to introduce a lazy bend m the length of the extrusion a generally H shaped slit is cut in the floor 1 and the roof 2. The slits are vertically aligned and each comprises a long slit H1 generally in the major axis of the extrusion. At each end slits H2 are cut, inclined to the major axis, having at each end a circular cut out H3 overlying the thickness of the sidewalls 3, 4. The sidewall of one length of the slit is cut away to form a generally tringular portion H4, one on each side of the long slit HI. Ile other portion of the end slit H2 has parallel sidewalls H5,H6 spaced slightly apart. The slits may be cut in any convenient way, including by law cutting.
The length is mounted in between parallel side walls of a chuck 11 of a jig 10 (Figure 3) with the portion having the slit H extending beyond the chuck. A G clamp 12 is mounted with one jaw 13 in engagement with one side of the element beyond the slit H and another 14 in engagement with a wall 15 laterally spaced from the chuck 11. The clamp is then tightened to apply a force F to move the extrusion towards the wall 15. The slit portion bends and the opposite faces of the long slit H1 slide to reach the condition shown in Figure 4. It will be noted that the left hand triangular portion H4 has closed up, moving the sidewalls H5,H6 apart to form a corresponding triangular portion H7 and the same effect has happened at the other end of the slit HI. The length between the slits H2 has been bent as required without any cracking of the metal or distortion of the box section. The holes may be fiffied in and the whole rubbed down to leave little or not tell tale marks of how the bend was introduced into the element. Holes may be drilled m the sidewalls 3,4 and cross- members, e.g. bolts, introduced for the element to be mounted, e.g. as a frame member of a car chassis.
In the embodiment shown the inclined portion is introduced intermediate the ends of an elongate element, so forming two bends A and B (Figure 4). In the method of the invention one bend only may be introduced, e.g. towards the end of an element.
LS/das/25.10.96 P01536GB.DES

Claims (6)

CLAIMS 1. A method of introducing a bend portion into a straight elongate hollow member, the method comprising the steps of:
1) cutting (i) an elongate slit in opposite side wall portions of the member, the slit extending substantially in the major axis of the member, and (ii) a cross slit in the region of the intended bend point, the slit extending between the wall portions and extending to overlie the wall portions, and 2) removing a portion of metal between the cross slit and the elongate slit to allow movement of the walls of the elongate slit, and 3) applying a force to one side of the element and forward of the region of the cross-sk to introduce the bend.
2. A method according to Claim 1, wherein the hollow member is of boxsection.
3. A method according to Claim 1 or 2, wherein a cross slit is formed at each end of the elongate slit and in communication with the elongate slit.
4. A method of forming a bend portion in an elongate straight member.of hollow box section having a floor and roof and opposite sidewalls, the method comprising: (i) forming aligned slits in the top and bottom walls of the section, the slits comprising a major slit extending generally in or parallel to the major axis between the intended ends of the bend portion and a slit at each end of the longitudinal slit, the end slits extending between the side walls and being inclined to the longitudinal axis and having at each end a portion which overlies the respective side wall, a generally triangular cut out being present at one end of each end slit, the triangular portions being on opposite sides of the longitudinal slit and (ii) applying a force to one side of the portion to be bent to cause the portions on opposite sides of the longitudinal slit to slide with respect to each other.
5. A method according to any preceding Claim, wherein the elongate slit extends longitudinally of the member at an angle to the major axis thereof.
6. A method according to any preceding Claim, including the steps of filling in the gaps formed by the bending operation and then smoothing the surface whereby tell tale marks are avoided.
ISIBW14.2.97 P1536GB.CL
GB9622234A 1996-10-25 1996-10-25 Bending of elongate elements Withdrawn GB2318754A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB9622234A GB2318754A (en) 1996-10-25 1996-10-25 Bending of elongate elements
GB9718708A GB2318753A (en) 1996-10-25 1997-09-03 Bending of elongate elements
DE69712465T DE69712465D1 (en) 1996-10-25 1997-10-27 BEND ELONGITAL ELEMENTS
AU47104/97A AU4710497A (en) 1996-10-25 1997-10-27 Bending of elongate elements
PCT/GB1997/002800 WO1998018580A1 (en) 1996-10-25 1997-10-27 Bending of elongate elements
EP97909413A EP0876229B8 (en) 1996-10-25 1997-10-27 Bending of elongate elements
NO19982914A NO312657B1 (en) 1996-10-25 1998-06-22 Method of inserting a bent portion into a straight, elongated hollow member as well as an element performed according to the method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9622234A GB2318754A (en) 1996-10-25 1996-10-25 Bending of elongate elements

Publications (2)

Publication Number Publication Date
GB9622234D0 GB9622234D0 (en) 1996-12-18
GB2318754A true GB2318754A (en) 1998-05-06

Family

ID=10801944

Family Applications (2)

Application Number Title Priority Date Filing Date
GB9622234A Withdrawn GB2318754A (en) 1996-10-25 1996-10-25 Bending of elongate elements
GB9718708A Withdrawn GB2318753A (en) 1996-10-25 1997-09-03 Bending of elongate elements

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB9718708A Withdrawn GB2318753A (en) 1996-10-25 1997-09-03 Bending of elongate elements

Country Status (1)

Country Link
GB (2) GB2318754A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CO4750694A1 (en) * 1996-12-12 1999-03-31 Dana Corp METHOD FOR THE PREPARATION OF A HOLLOW PIECE OF THE CHASSIS OF A VEHICLE WITH SHARP EDGE

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974436A (en) * 1989-02-24 1990-12-04 Sanko Industries Limited Cutting tool to facilitate bending of hollow tubing
US5018263A (en) * 1989-10-02 1991-05-28 Stern Melvin J Method for making a metal screen door frame

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974436A (en) * 1989-02-24 1990-12-04 Sanko Industries Limited Cutting tool to facilitate bending of hollow tubing
US5018263A (en) * 1989-10-02 1991-05-28 Stern Melvin J Method for making a metal screen door frame

Also Published As

Publication number Publication date
GB9718708D0 (en) 1997-11-12
GB9622234D0 (en) 1996-12-18
GB2318753A (en) 1998-05-06

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)