EP1544375A1 - Cross member for fast-fit prefabricated scaffolding, and relative production method - Google Patents

Cross member for fast-fit prefabricated scaffolding, and relative production method Download PDF

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Publication number
EP1544375A1
EP1544375A1 EP04106483A EP04106483A EP1544375A1 EP 1544375 A1 EP1544375 A1 EP 1544375A1 EP 04106483 A EP04106483 A EP 04106483A EP 04106483 A EP04106483 A EP 04106483A EP 1544375 A1 EP1544375 A1 EP 1544375A1
Authority
EP
European Patent Office
Prior art keywords
tubular member
central longitudinal
end portion
longitudinal plane
scaffolding
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Withdrawn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
EP04106483A
Other languages
German (de)
English (en)
French (fr)
Inventor
Oreste Fracasso
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.)
Metalmeccanica Fracasso SpA
Original Assignee
Metalmeccanica Fracasso SpA
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 Metalmeccanica Fracasso SpA filed Critical Metalmeccanica Fracasso SpA
Publication of EP1544375A1 publication Critical patent/EP1544375A1/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G7/00—Connections between parts of the scaffold
    • E04G7/30—Scaffolding bars or members with non-detachably fixed coupling elements
    • E04G7/32—Scaffolding bars or members with non-detachably fixed coupling elements with coupling elements using wedges
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G7/00—Connections between parts of the scaffold
    • E04G7/30—Scaffolding bars or members with non-detachably fixed coupling elements
    • E04G7/302—Scaffolding bars or members with non-detachably fixed coupling elements for connecting crossing or intersecting bars or members
    • E04G7/306—Scaffolding bars or members with non-detachably fixed coupling elements for connecting crossing or intersecting bars or members the added coupling elements are fixed at several bars or members to connect
    • E04G7/307—Scaffolding bars or members with non-detachably fixed coupling elements for connecting crossing or intersecting bars or members the added coupling elements are fixed at several bars or members to connect with tying means for connecting the bars or members

Definitions

  • the present invention relates to a cross member for fast-fit prefabricated scaffolding.
  • the present invention relates to a cross member for "LAYHER" type fast-fit prefabricated scaffolding or similar.
  • the vertical members each comprise a cylindrical tubular member of appropriate length; and a number of anchoring disks or plates appropriately spaced along the whole length of the tubular member.
  • each anchoring plate has a central through hole, by which it fits rigidly to the body of the cylindrical tubular member; and a number of radial through slits spaced angularly about the whole body of the plate.
  • Each horizontal cross member comprises a cylindrical tubular member of appropriate length; and two end attachments fixed rigidly to the two ends of the tubular member.
  • Each of the two end attachments comprises a transverse groove or slot extending, perpendicular to the central longitudinal plane of the horizontal cross member, from the end of the end attachment, and which is engaged by a portion of the anchoring plate of the vertical member; and a diametrical through hole extending through the body of the end attachment, parallel to the central longitudinal plane of the horizontal cross member, so as to intersect the transverse slot.
  • the diametrical through hole is engaged by a key, shim, or wedge sized to also fit through one of the radial through slits, in the anchoring plate, aligned with the hole, so as to fasten the end attachment rigidly to the anchoring plate.
  • end attachments of the horizontal cross members are simply cast in one piece separately from the tubular member, and are then driven into the two ends of the tubular member to form an interference fit.
  • Horizontal cross members produced in this way are obviously much more expensive to manufacture than those of conventional scaffolding, and so account for the big difference in the purchase cost of "LAYHER" type fast-fit prefabricated scaffolding as compared with conventional types.
  • a cross member for "LAYHER" type fast-fit prefabricated scaffolding or similar comprising a tubular member of predetermined length and two end attachments located at the two ends of the tubular member and designed to fit onto the anchoring plates of the vertical members of said "LAYHER" type fast-fit prefabricated scaffolding or similar; said cross member being characterized in that at least one of said two end attachments is formed in one piece with the tubular member.
  • the present invention also relates to a new method of producing cross members for "LAYHER" type fast-fit prefabricated scaffolding or similar.
  • a method of producing cross members for "LAYHER" type fast-fit prefabricated scaffolding or similar each comprising a tubular member of predetermined length and two end attachments located at the two ends of said tubular member; at least one of said two end attachments being formed in one piece with said tubular member and the method of producing being characterized by comprising the steps of:
  • number 1 indicates as a whole a cross member, for "LAYHER" type fast-fit prefabricated scaffolding or similar, designed to fit onto vertical members 2, each of which comprises a cylindrical tubular member 3 of appropriate length, and a number of anchoring disks or plates 4 appropriately spaced along the whole length of tubular member 3.
  • each anchoring plate 4 comprises a central through hole, by which it fits rigidly onto the outer surface of the body of cylindrical tubular member 3, coaxially with the longitudinal axis A of tubular member 3; and a number of radial through slits 5 angularly spaced on the body of the plate.
  • scaffolding cross member 1 comprises a tubular member 6 of appropriate length and preferably, though not necessarily, circular or oval cross section; and two end attachments 7 at the two ends of tubular member 6.
  • the two end attachments 7 are designed to fit, by means of keys, to anchoring plates 4 of vertical members 2, and, unlike known scaffolding cross members, are formed in one piece with tubular member 6, and so define the two end portions 6a of tubular member 6.
  • a corresponding end portion 6a of tubular member 6 is worked mechanically to permanently deform the wall of tubular member 6, and is subsequently cold cut to obtain a finished form compatible with use with "LAYHER" type fast-fit prefabricated scaffolding or similar.
  • each end attachment 7 is defined by an end portion 6a, of tubular member 6, which has been cold formed to a hollow ogival shape with a substantially wedge-shaped profile extending along a first central longitudinal plane P 1 of tubular member 6.
  • tubular member 6 is symmetrical with respect to central longitudinal plane P 1 , and is bounded laterally by two substantially flat major lateral surfaces 7a facing each other on opposite sides of central longitudinal plane P 1 and sloping to form an angle ⁇ of less than 90°.
  • end portion 6a of tubular member 6 also comprises two substantially flat minor lateral surfaces 7b parallel to and facing each other on opposite sides of a second central longitudinal plane P 2 , perpendicular to central longitudinal plane P 1 , of tubular member 6.
  • the two major lateral surfaces 7a converge with each other and are perpendicular to central longitudinal plane P 2
  • the two minor lateral surfaces 7b are perpendicular to central longitudinal plane P 1 and substantially parallel to central longitudinal plane P 2 .
  • end attachment 7, i.e. the cold formed end portion 6a of tubular member 6, terminates with a front surface 7c, which is perpendicular to the longitudinal axis of tubular member 6 defined by the intersection of central longitudinal planes P 1 and P 2 , and is shaped to rest against the outer surface of tubular member 3 of vertical member 2.
  • front surface 7c is substantially cylindrical with substantially the same radius of curvature as tubular member 3 of vertical members 2.
  • front surface 7c of end attachment 7 may even be substantially flat.
  • end attachment 7, i.e. the cold formed end portion 6a of tubular member 6, also comprises a transverse groove or slot 8, which extends inwards of the attachment, from the axial end, i.e. front surface 7c, of the attachment, is perpendicular to central longitudinal plane P 1 of tubular member 6, and is coplanar or at any rate parallel to the second central longitudinal plane P 2 of tubular member 6.
  • transverse slot 8 is sized to be engaged by a portion of anchoring plate 4 of vertical member 2, and end attachment 7 also comprises two longitudinal through slits 9, preferably though not necessarily with a rectangular cross section, which are formed in the wall of end portion 6a of tubular member 6, on opposite sides of central longitudinal plane P 2 of tubular member 6, and therefore on opposite sides of transverse slot 8, and each at a respective minor lateral surface 7b of end attachment 7.
  • the two through slits 9 are formed in the lateral wall of tubular member 6 so as to be aligned with each other along central longitudinal plane P 1 , and are engaged by a substantially trapezoidal key, shim, or wedge 10 sized to also engage the radial through slit 5, in anchoring plate 4, aligned with the two through slits 9, so as to fasten end attachment 7 rigidly to anchoring plate 4.
  • scaffolding cross member 1 is formed from a tubular member 6, by permanently deforming an end portion 6a of tubular member 6, so that the end portion assumes a hollow ogival shape with a substantially wedge-shaped profile, and then appropriately cutting the wall of end portion 6a to form transverse slot 8 and the two longitudinal through slits 9.
  • scaffolding cross member 1 is formed from a tubular member 6 of predetermined length, by bending two lateral portions 6b of end portion 6a of tubular member 6, located on opposite sides of central longitudinal plane P 1 , towards each other and towards central longitudinal plane P 1 .
  • the method of producing scaffolding cross members 1 comprises pinching end portion 6a of tubular member 6 on opposite sides of central longitudinal plane P 1 to superimpose the two lateral portions 6b and form two arc-shaped cusps 6c on opposite sides of second central longitudinal plane P 2 .
  • the method of producing scaffolding cross members 1 comprises bending the two arc-shaped cusps 6c towards each other and onto the two lateral portions 6b, and then pinching the deformed end portion 6a of tubular member 6 on opposite sides of central longitudinal plane P 2 , so that end portion 6a assumes an ogival shape with a substantially wedge-shaped profile extending along first central longitudinal plane P 1 of tubular member 6, and with four substantially flat lateral surfaces facing one another in pairs.
  • the method of producing scaffolding cross members 1 comprises pinching end portion 6a of tubular member 6 on opposite sides of central longitudinal plane P 2 , so that end portion 6a assumes a substantially wedge shape comprising two substantially flat major lateral surfaces perpendicular to central longitudinal plane P 2 and on opposite sides of central longitudinal plane P 1 , and two substantially flat minor lateral surfaces perpendicular to central longitudinal plane P 1 and on opposite sides of central longitudinal plane P 2 .
  • the major lateral surfaces define the two major lateral surfaces 7a of end attachment 7, and the two minor lateral surfaces define the two minor lateral surfaces 7b of end attachment 7.
  • the method of producing scaffolding cross members 1 comprises cutting the wall of end portion 6a of tubular member 6 on opposite sides of central longitudinal plane P 2 and at the two minor lateral surfaces of end portion 6a, i.e. at the two minor lateral surfaces 7b of end attachment 7, to form two preferably though not necessarily rectangular longitudinal through slits 9 engageable by key, shim, or wedge 10.
  • the flap or scrap produced by cutting the wall of tubular member 6 to form through slits 9 may either be removed completely or folded inside tubular member 6 and pinched against the two lateral portions 6b of the wall of tubular member 6 (see Figure 5).
  • the method of producing scaffolding cross members 1 also comprises pinching the two lateral portions 6b, the two arc-shaped cusps 6c, and possibly also the two flaps or scraps produced by forming through slits 9, so as to compact the whole and smooth the front surface of end portion 6a defining front surface 7c of end attachment 7.
  • the method of producing scaffolding cross members 1 comprises forming transverse groove or slot 8 parallel to central longitudinal plane P 2 of tubular member 6. This can be done by cold blanking or more simply using a rotary disk cutter capable of cutting the deformed wall of tubular member 6, while remaining coplanar with or at any rate parallel to central longitudinal plane P 2 of tubular member 6.
  • Scaffolding cross member 1 as described and illustrated herein has numerous, obvious advantages. Firstly, the cross member so formed is much cheaper to produce than known types, thus making "LAYHER" type fast-fit prefabricated scaffolding economically competitive with conventional scaffolding.
  • the method of producing scaffolding cross members 1 can be implemented easily using multipurpose dies designed to perform the various permanent deformation and cutting operations of the two ends of tubular member 6 fully automatically.
  • tubular member 6 for producing scaffolding cross member 1 may have a rectangular, square, trapezoidal, or generally polygonal cross section.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Ladders (AREA)
EP04106483A 2003-12-12 2004-12-10 Cross member for fast-fit prefabricated scaffolding, and relative production method Withdrawn EP1544375A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20031003 2003-12-12
ITTO20031003 ITTO20031003A1 (it) 2003-12-12 2003-12-12 Traversa per ponteggi prefabbricati a montaggio rapido e relativo metodo di fabbricazione.

Publications (1)

Publication Number Publication Date
EP1544375A1 true EP1544375A1 (en) 2005-06-22

Family

ID=34509516

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04106483A Withdrawn EP1544375A1 (en) 2003-12-12 2004-12-10 Cross member for fast-fit prefabricated scaffolding, and relative production method

Country Status (2)

Country Link
EP (1) EP1544375A1 (it)
IT (1) ITTO20031003A1 (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008043339A1 (de) * 2006-10-11 2008-04-17 Wilhelm Layher Verwaltungs-Gmbh Vertikalrahmen aus metall
EP3315691A1 (en) * 2016-10-27 2018-05-02 Amadio & C. S.P.A. Scaffolding for buildings and industrial buildings with a connection system for connecting uprights and guard rails supporting a planking floor
DE102017216892A1 (de) * 2017-09-25 2019-03-28 Peri Gmbh Gerüstelement zur Anbindung an eine scheibenförmige Anschlussplatte sowie Gerüst-Teil mit einem solchen Gerüstelement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493578A (en) * 1982-09-30 1985-01-15 Harsco Corporation Scaffolding connector and system
US4603756A (en) * 1984-02-29 1986-08-05 Ulrich Layher Metal pipe scaffolding
DE10225403A1 (de) * 2001-06-07 2003-03-06 Rux Volker Ständerwerk

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493578A (en) * 1982-09-30 1985-01-15 Harsco Corporation Scaffolding connector and system
US4603756A (en) * 1984-02-29 1986-08-05 Ulrich Layher Metal pipe scaffolding
DE10225403A1 (de) * 2001-06-07 2003-03-06 Rux Volker Ständerwerk

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008043339A1 (de) * 2006-10-11 2008-04-17 Wilhelm Layher Verwaltungs-Gmbh Vertikalrahmen aus metall
CN101384780B (zh) * 2006-10-11 2013-07-10 德国威海姆·莱亚股份有限公司 竖直的金属框架
US8978822B2 (en) 2006-10-11 2015-03-17 Wilhelm Layher Verwaltungs-Gmbh Vertical frame of metal
EP3315691A1 (en) * 2016-10-27 2018-05-02 Amadio & C. S.P.A. Scaffolding for buildings and industrial buildings with a connection system for connecting uprights and guard rails supporting a planking floor
DE102017216892A1 (de) * 2017-09-25 2019-03-28 Peri Gmbh Gerüstelement zur Anbindung an eine scheibenförmige Anschlussplatte sowie Gerüst-Teil mit einem solchen Gerüstelement

Also Published As

Publication number Publication date
ITTO20031003A1 (it) 2005-06-13

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