WO1990014478A1 - Systeme d'echaffaudage a tubes et a raccords - Google Patents

Systeme d'echaffaudage a tubes et a raccords Download PDF

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Publication number
WO1990014478A1
WO1990014478A1 PCT/AU1990/000206 AU9000206W WO9014478A1 WO 1990014478 A1 WO1990014478 A1 WO 1990014478A1 AU 9000206 W AU9000206 W AU 9000206W WO 9014478 A1 WO9014478 A1 WO 9014478A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
scaffolding
members
markings
marking
Prior art date
Application number
PCT/AU1990/000206
Other languages
English (en)
Inventor
Warwick Percival Hocking
James Cheng
Original Assignee
Tu-Fit Australia Pty. Limited
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 Tu-Fit Australia Pty. Limited filed Critical Tu-Fit Australia Pty. Limited
Priority to KR1019910701649A priority Critical patent/KR920701598A/ko
Priority to AU56667/90A priority patent/AU655402B2/en
Publication of WO1990014478A1 publication Critical patent/WO1990014478A1/fr

Links

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
    • E04G7/02—Connections between parts of the scaffold with separate coupling elements
    • E04G7/06—Stiff scaffolding clamps for connecting scaffold members of common shape
    • E04G7/12—Clamps or clips for crossing members
    • 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
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/02—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means
    • E04G1/12—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means comprising members of special, e.g. composite, cross-section or with lugs or the like or lateral apertures for supporting or attaching other members
    • 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
    • E04G1/00—Scaffolds primarily resting on the ground
    • 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
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/02—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means
    • E04G1/04—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means the members being exclusively poles, rods, beams, or other members of similar form and simple cross-section
    • E04G1/06—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means the members being exclusively poles, rods, beams, or other members of similar form and simple cross-section comprising members with rod-like or tubular portions fitting together end to end, with or without separate connecting pieces
    • 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
    • E04G7/02—Connections between parts of the scaffold with separate coupling elements
    • E04G7/06—Stiff scaffolding clamps for connecting scaffold members of common shape
    • E04G7/20—Stiff scaffolding clamps for connecting scaffold members of common shape for ends of members only, e.g. for connecting members in end-to-end relation
    • 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
    • E04G7/02—Connections between parts of the scaffold with separate coupling elements
    • E04G7/26—Connections between parts of the scaffold with separate coupling elements for use with specially-shaped scaffold members
    • 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
    • E04G7/02—Connections between parts of the scaffold with separate coupling elements
    • E04G7/28—Clips or connections for securing boards
    • 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
    • E04G7/02—Connections between parts of the scaffold with separate coupling elements
    • E04G7/28—Clips or connections for securing boards
    • E04G2007/285—Clips or connections for securing boards specially adapted for toe boards

Definitions

  • the present invention relates to a scaffolding system and relates particularly to an improved scaffolding member that facilitates more efficient erection of scaffolding structures.
  • the invention also relates to a method and apparatus for converting conventional scaffolding tubes to be compatible with the scaffolding system of the present invention.
  • Australian Patent No. 569301 is for an anchoring device, or multi-connector, for holding up to four horizontal tubular scaffolding members to a vertical member.
  • Figure 1 is a fragmentary section of the connector joined to a horizontal.
  • a bolt 36 provided on the connector can be received in a terminal hole 48 provided in the horizontal scaffolding member, to lock the horizontal member to the vertical.
  • the multi- connector has a sill 29 having a bore 30 provided with a seating formation 32 in the form of a countersunk recess, for receiving a lug 34 of the bolt 36.
  • the undersurface of the sill 29 has an angularly profiled surface 38 which biases the axis of the bolt 26 in the direction of the line A-B, when the nut of the bolt 36 is fastened to contact the surface 38.
  • the multi-connector also has a bore 40 for receiving a screw or a pin for locating the connector on a vertical or horizonal scaffolding member.
  • Some of the vertical or horizontal scaffolding members disclosed in Australian Patent No. 569301 have a plurality of holes 44 formed in a straight line on the tube and spaced apart at about 250mm.
  • the holes 44 are provided to enable the connector to be located on the tube using a screw or pin received through the bore 40 in the connector and in one of the holes 44.
  • the present invention is based on the discovery that if the holes 44 are provided at predetermined spaced apart distances along the length of the tube and that in addition the first hole is drilled at a predefined distance from one end of the tube, the holes 44 not only allow a connector to be located on the tube, but also provide an accurate measure of the length of the tube and enable precise positioning of coupling elements along the length of the tube relative to the position of the holes.
  • the current practice with tube and fitting scaffolding is to adopt a strictly methodical erection sequence, using many tubes solely as erection aids, i.e. as temporary retention bracing with no structural function, while the horizontal and vertical members are aligned.
  • erection aids i.e. as temporary retention bracing with no structural function
  • horizontal and vertical members are aligned.
  • random lengths of tubing which tends to be loss generators in the sense that they increase either the cost of supply or the cost of using the tubing.
  • the present invention was developed with a view to providing an improved scaffolding system and scaffolding members that facilitate more efficient assembly of a scaffolding structure.
  • an elongate scaffolding member having a plurality of indelible markings at predetermined spaced apart distances along a longitudinal surface of the member, a first of said markings nearest one end of the member being located a pre ⁇ defined distance from said one end whereby, in use, said markings provide an accurate measure of the length of the member and enable precise positioning of coupling elements and fittings along the length of the member.
  • a scaffolding system comprising a plurality of elongate scaffolding members, each member having a plurality of indelible markings at predetermined spaced apart distances along a longitudinal surface of the member, a first of said markings nearest one end of the member being located a predefined distance from said one end, said predetermined distances and predefined distance being constant from member to member in the system whereby, in use, said markings provide an accurate measure of the length of the members and enable precise positioning of coupling elements and fittings along the length of the members.
  • the markings are spaced apart at equal predetermined distances to one another and are aligned in the longitudinal direction of the member.
  • the markings nearest the respective ends of the member are located the same predefined distance from the respective ends of the member.
  • the members are further provided with an indication adjacent each end, said indications being provided to indicate to a user that a member has been cut to a standard length compatible with said scaffolding system.
  • said indications are provided in the form of apertures, said apertures being adapted to receive a latching element therein whereby, in use, terminal coupling elements can be locked more securely to the members.
  • the members are hollow tubes and said markings are in the form of small holes or dimples in the wall of the tube.
  • an end connector for connecting two of the above scaffolding members end to end, the connector comprising: first and second end portions adapted to engage with the ends of two scaffolding members to be joined,- and, a central spacer portion adapted to maintain the ends of the two scaffolding members spaced apart at a distance selected to enable the spacing of said indelible markings on the scaffolding members across the end to end connection to be maintained at -said predetermined distance.
  • said end connector is a spigot-type end connector and said end portions are adapted to be received in the ends of the scaffolding members.
  • said central spacer portion maintains the ends of the two scaffolding members spaced apart at a selected distance equal to the outer diameter of the scaffolding members.
  • the spigot-type end connector is provided with first and second latch protrusions on the first and second end portions respectively, adapted to be received in terminal holes provided in the ends of the scaffolding members.
  • a method of converting a conventional scaffolding tube, of the kind employed in tube and fitting scaffolding, to be compatible with the scaffolding system of the present invention comprising the steps of: placing a first indelible marking on the tube a predefined distance from one end of the tube using a marking means; moving the tube or the marking means relative to the other a first predetermined distance in a longitudinal direction of the tube; placing a further indelible marking on the tube said first predetermined distance from the first indelible marking; and, repeating sequentially said steps of moving the tube or the marking means and placing a further indelible marking for the entire length of the tube.
  • steps of placing an indelible marking on the tube involve providing an indentation in the form of a dimple in the outer surface of the tube.
  • a second indentation in the form of a dimple is simultaneously provided in the outer surface of the tube in a diametrically opposite location.
  • said step of moving the tube or the marking means comprises moving the tube relative to a stationary marking means in the form of a press.
  • a marking tool which enables the placing of two dimples spaced apart a second predetermined distance and aligned in the longitudinal direction of the member, wherein said first predetermined distance is equal to twice said second predetermined distance.
  • an apparatus for converting a conventional tube, of the kind employed in tube and fitting scaffolding, to be compatible with the scaffolding system of the present invention comprising: marking means for placing indelible markings in or on a surface of the tube; and, transport means for moving the tube or the marking means relative to the other in a longitudinal direction of the tube whereby, in use, said transport means and said marking means can be operated sequentially commencing with the placing of a first indelible marking a predefined distance from one end of the tube and thereafter at predetermined spaced apart distances along a longitudinal surface of the tube.
  • said transport means comprises first and second carriages for moving the tube relative to the marking means, ' said first carriage feeding the tube through said marking means until the tube engages with the second carriage whereupon the second carriage draws the tube through the marking means for the remainder of its length.
  • Fig. 1 is a fragmentary section of the connector disclosed in Australian Patent No. 569,301;
  • Fig. 2 illustrates a preferred embodiment of a scaffolding member
  • Fig. 3 illustrates two applications of the scaffolding members using a conventional coupler
  • Fig. 4 illustrates two types of connection between the scaffolding members
  • Fig. 5 illustrates a transom end connection to the scaffolding members
  • Fig. 6 (a) , (b) and (c) illustrate the connection of a guard rail to the scaffolding members;
  • Fig. 7 shows a tarpaulin which may be connected to a scaffolding frame of the scaffolding system.
  • Fig. 8 is a perspective view of an apparatus for automatically converting standard lengths of tubing to form scaffolding members according to the invention.
  • Fig. 9 illustrates one of the carriages employed in the apparatus of Fig. 8; and Fig. 10 illustrates a tube in a start position in the apparatus of Fig. 8.
  • Figure 2 illustrates a preferred embodiment of the scaffolding member according to the invention in the form of a hollow tube 10, having a plurality of indelible markings 12 at predetermined spaced apart distances along the longitudinal surface of the tube.
  • the indelible markings are spaced apart at equal distances of 250mm to one another, and are aligned in the longitudinal direction of the tube 10.
  • the indelible markings 12 are indentations in the form of small keyholes or dimples drilled into the wall of the tube along two diametrically opposed lines extending in the longitudinal direction of the tube. In this manner, the position of the markings can be ascertained when viewing the tube from almost any angle.
  • a first pair of said indelible markings 12 nearest one end 14 of the member are located a predefined distance from the end 14, in this embodiment a distance of 101mm.
  • the predefined distance of the first dimples 12 from the end 14 of the scaffolding member has been carefully selected so that when the end 14 of the member is joined to the end of another member in a scaffolding structure, the spacing of the dimples 12 remains constant from one member to an adjacent aligned scaffolding member.
  • a spigot-type end connector 16 comprises two halves held together by a bolt 18 received through a central spacer portion 20 of the end connector.
  • the central spacer portion 20 of the spigot connector is of increased diameter relative to the two end portions 22 which are received in the ends 14 of two scaffolding members 10.
  • the spacer portion 20 of the spigot connector expands to approximately the outer diameter of the tubes, and separates the two ends 14 of the tubes at a spaced apart distance, in this embodiment selected to be 48mm.
  • the selected distance of 48mm was selected to be compatible with the outer diameter dimension of the tubular scaffolding member 10, which is also equal to 48mm.
  • a further feature of the spigot connector 15 is the provision of two latch protrusions 24 on one half of the end portions 22, the latch protrusions 24 being sized and shaped to fit in the terminal holes 48 provided on the members 10. As the two halves of the spigot type end connector 16 expand through the action of bolt 18, the latch protrusions 24 are received in the terminal holes 48 of the scaffolding members to prevent the two members from coming apart.
  • the end connector of the present invention may also be provided in the form of a sleeve-type end connector, in which the central spacer portion and latch protrusions are provided internally of the sleeve.
  • Other types of end connector can also be employed to embody the novel features of the invention.
  • a significant advantage of the present invention is that the scaffolding members 10 can be formed from conventional tubing which is accurately cut to length with indelible markings provided in the longitudinal direction of the tubing.
  • the scaffolding members can therefore be used in conjunction with all conventional couplers and fittings, as well as with several new types of couplers and fittings which utilise unique locking or locating features, such as the spigot-type end connector described above.
  • Figure 3 illustrates the use of the scaffolding members 10 with a conventional coupler 50 for connecting scaffolding members in a mutually perpendicular configuration.
  • the function of the coupler 50 is unhindered by the presence of the dimples 12 and terminal hole 48 in the scaffolding members 10.
  • the presence of the dimples 12 facilitates accurate positioning of the members 10 in the coupler 50 as they provide reference points in relation to which various edges and parts of the coupler can be precisely aligned.
  • a bolt provided in the coupler 50 has been aligned with a dimple 12 on the vertical member 10 to precisely position the other member 10 in the horizontal position.
  • Couplers provided on the other ends (not shown) of the horizontal member 10 can be located in relation to the corresponding dimples 12 provided on the vertical scaffolding members at those ends to ensure that the horizontal scaffolding member is oriented perfectly horizonal.
  • the horizontal member 10 in Fig. 3 has been positioned relative to the coupler 50 by aligning a dimple 12 with the right edge of the gate on the coupler 50. To avoid fixing errors, the edge chosen should remain consistent on the same member 10.
  • the bolt (centre) of the coupler should be aligned with the dimple.
  • Figure 4 illustrates the use of the scaffolding members 10 with a multi-connector 56 of the kind described in Australian Patent No. 569,301 referred to above, and a spigot- type end connector 16 described above.
  • Fig. 4 the manner of connecting two horizontal members 10 to a vertical scaffolding member, with the ends 14 of the horizontal tubular members butted up against diametrically opposed sides of the vertical tube using the multi-connector 56, is clearly illustrated.
  • Fig. 4 it can be seen that not only is the spacing between dimples 12 maintained in the vertical direction across the end to end connection at spigot 16, but also the spacing between dimples 12 in the horizontal direction across the connection between the horizontal members at the multi- connector 56 is also maintained.
  • FIG. 5 illustrates the inter-connection of scaffolding members 10 using a spigot connector 16 to connect the vertical members and a transom end coupler 58 for connecting a horizontal tubular member used as a transom for supporting scaffolding boards 60.
  • the transom end coupler 58 is a standard coupler which has been modified by the provision of a protruding portion 62 received in the end 14 of the transom member 10 and held therein by a bolt passing through the terminal holes 48 in the member 10 and a corresponding bore through the protruding portions 62 of the transom end coupler 58.
  • the position of the transom end coupler 58 has been located by aligning the lower edge of the coupler with one of the dimples 12 on the vertical scaffolding member 10.
  • FIGs 6 (a) , (b) and (c) illustrate a further application of the scaffolding members 10 using flip couplers 64 of the kind illustrated in Fig. 6 (a) .
  • the dimples 12 on the members 10 facilitate easy and accurate positioning of the flip couplers to achieve a precise horizontal orientation for a guard rail 66 of the type illustrated in Figs. 6 (b) .
  • the flip couplers 64 when used in connection with the scaffolding members 10, also have numerous other applications,, including the fastening of a tarpaulin or other panel similar to that illustrated in Fig. 7.
  • the tarpaulin 68 illustrated in Fig. 7 is provided with holes along its respective edges for receiving the flip fastener of the flip couplers 64 therein, to enable the tarpaulin to be stretched between horizontal and vertical scaffolding members.
  • the scaffolding system of the present invention retains all the flexibility of conventional scaffolding members with the added value provided by the indelible markings 12, enabling precise and accurate positioning of connecting scaffolding members, couplers and fittings.
  • the preferred embodiment of the scaffolding members 10 provides lower handling and maintenance costs, compared with known modular and frame scaffolding systems, as only one type of stock needs to be used for all the scaffolding members.
  • This is standard 48mm (actually 48.4mm) diameter scaffold tube cut accurately, in increments of 250mm, to popular lengths. Typical stock sizes are 6000, 4500, 4000, 3000, 2500, 2000, 1750 and 1500mm.
  • Standard length scaffolding members are provided with suitably sized holes at each end, (terminal holes) to facilitate attachment of various terminal couplers and fittings, and indelible markings or dimples are formed at 250mm centres along the whole length of the tube preferably on two diametrically opposed sides of the tube.
  • a further function of the terminal holes in the scaffolding system of the present invention is that they serve to indicate to the user which lengths of tubing are cut to standard lengths compatible with the system. Not infrequently a length of tubing is cut to a non-standard length to suit a particular structure, and in the act of cutting the terminal hole would be removed.
  • this function of indicating a standard length can be provided by any form of indication adjacent the ends of the member such as, for example, a small cut-out portion at each end.
  • the beauty of the terminal holes is that they perform a dual function.
  • the indelible markings 12 of the preferred embodiment are in the form of small indentations, keyholes or dimples
  • the markings may be formed in any appropriate manner, for example, by providing circumferential grooves at the predetermined spaced apart distances along the longitudinal surface of the tube.
  • small keyholes or dimples aligned in the longitudinal direction of the members are the preferred form as these facilitate rotational or radial location as well as height or length location.
  • a further advantage of the present invention is that existing conventional tube can easily be converted to be compatible with the scaffolding system of the invention at reasonably low cost.
  • the apparatus comprises marking means in the form of a power press 70 for marking the tube with indelible markings in the form of dimples, and an elaborate transport system for automatically feeding tubes 71 through the press 70.
  • the transport system comprises parallel rails 72 upon which two transport carriages 74 and 76 are located. The first carriage 74 is arranged to push a tube 71 a predetermined distance through the press 70 and the second carriage 76 is arranged to pull the tube through the press the remaining distance, as will be described in greater detail below.
  • the power press 70 employed in this embodiment of the invention is a "John Heine 203" hydraulic power press, adapted to be pneumatically operated by a pneumatic cylinder 78.
  • the power press 70 is provided with a marking tool 80 adapted to place two pairs of indentations in the form of dimples in the surface of the tube 71. In a single stroke of the press 70 four dimples are made, a first pair placed in diametrically opposed locations in the outer surface of the tube 71 and a second pair spaced 250mm from the first pair and also placed in diametrically opposed locations in the outer surface of the tube, but aligned with the respective dimples of the first pair in the longitudinal direction of the tube.
  • carriage 74 The function of carriage 74 is to position the tube 71 correctly, pierce two terminal holes 48 in one end of the tube, eject the slugs from piercing and advance the tube into the power press 70 for the first two pair of indentations. Carriage 74 then correctly positions the tube 71 for the second carriage 76 to engage.
  • carriage 74 comprises a chassis 82 arranged for rolling movement on rails 72.
  • a frame 84 mounted on the chassis 82 houses a lever system comprising a pivotable lever 86 having a vertically oriented hydraulic cylinder 88 operatively connected at one end thereof, and a first hole punch 90 operatively connected at the other end thereof.
  • a second hole punch 92 is provided vertically aligned with the first hole punch 90 and operatively connected to another lever (not visible) similar to lever 86 and operatively connected to the opposite end of hydraulic cylinder 88.
  • lever 86 pivots about the pivot point 94 and causes vertical movement of hole punch 90.
  • An equal and opposite movement of hole punch 92 is also produced.
  • a mandrel 96 is fixedly mounted on frame 84 and is adapted to receive the end of tube 71 thereon.
  • Mandrel 96 is hollow and is provided with diametrically opposed apertures aligned in the vertical direction with the hole punches 90 and 92.
  • mandrel 96 performs the dual function of locating the tube on the carriage 74 and acting as a die for the hole punches 90 and 92.
  • Hole punches 90 and 92 are designed to produce the terminal holes 48 in the end of tube 71.
  • Movement of the first carriage 74 is effected by two pneumatic cylinders 98 and 100 linked end to end.
  • Cylinder 98 is connected to the chassis 82 of carriage 74 and cylinder 100 is anchored at its opposite end to a mounting block 102 on one of the rails 72.
  • the maximum distance that carriage 74 can travel is determined by the combined strokes of cylinders 98 and 100.
  • the position of the mounting block 102 is selected based on the standard lengths of the tubes employed in the scaffolding system. The position of the mounting block 102 must be changed when a different size tube is to be converted. Tubes up to 6 metres long can be processed with this apparatus, by positioning the mounting block 102 at the far end, (to the right in Fig. 8) , of the rails 72.
  • Pneumatically operated tube supports 104 can be raised to support long tubes at selected points between the carriages 74 and 76 and the press 70.
  • Carriage 74 is also provided with a tube support 106 mounted on the front of chassis 82 to guide the tube 71 onto the mandrel 96.
  • a first guide rail 108 is fixedly mounted to the chassis 82 of carriage 74 with a support bracket 109 and together with a second guide rail 110, which extends from one end of a chain conveyer 112 to a position adjacent the mouth of the power press 70, acts to guide a tube 71 from the chain conveyer 112 into the start position to commence the operating cycle of the apparatus.
  • a tube stop 114 is provided ad acent the mouth of the power press 70 and is adapted to open and close by means of pneumatic cylinder 116. In its closed position the tube 71 abuts hard up against the stop 114 and is prevented from entering the mouth of the press.
  • the function of the chain feed conveyor 112 is to position the tube 71 ready for loading onto the first carriage 74. Tubes are hand loaded onto a primary input hopper (not shown) which loads tube one at a time when needed onto the chain feed conveyor 112. As the primary input hopper is of conventional design the technical description will commence with a tube in position on the chain conveyor 112.
  • the second-' carriage 76 is of similar design to the first carriage 74 and the same parts will not be described again.
  • carriage 76 is provided with a guide rail 120 which slopes downwardly to guide a tube away from the carriage 76, when it is ejected from the apparatus by pneumatically operated kickers (not shown) .
  • a second difference is the manner in which carriage 76 is moved along rails 72.
  • Carriage 76 is linked to a third carriage 122 by a pneumatic cylinder 124 that has a stroke of 500mm.
  • the rails 72 on this side of the press are provided with a plurality of index plates 126 spaced apart 500mm, which enable the tube 71 to be indexed through the press 70 at intervals of 500mm at a time.
  • the second and third carriages 76 and 122 are both provided with indexing systems.
  • Carriage 76 has a carriage lock operated by a pneumatic cylinder 128 which engages when operated with an index plate 126 to lock carriage 76 in position on rails 72.
  • the third carriage 122 is provided with an indexing lever mechanism operated by pneumatic cylinder 130. Indexing levers 132 provided on both sides of carriage 122 are adapted to engage index plates 126 and lock carriage 122 in position when cylinder 130 is operated.
  • P.L.C. programmable logic controller
  • the tube 71 Upon arrival at the chain conveyor 112 the tube 71 is sensed by a limit switch which in turn sends a signal to the P.L.C. which instructs a motor (not shown) to advance the chain conveyor (with the tube) to a designated stop position adjacent the guide rails 108 and 110. Upon arrival at this position the tube 71 is again sensed and a signal sent to the P.L.C. which also senses when the first carriage 74 is clear and in a position to receive the tube. When these conditions have been met the P.L.C.
  • the P.L.C. instructs cylinder 116 to advance tube stop 114 to its closed position so that the tube 71 abutts against the stop 114 and is prevented from entering the mouth of the press.
  • tube support 104 (and adjacent supports depending on the length of the tube) may be in the raised position. Tube support 104 and tube support 106 on the carriage 74 arrest the tube in the correct position to proceed with the operating cycle.
  • pneumatic cylinder 100 advances carriage 74 on rails 72 towards the press 70, forcing the tube 71 hard against the stop 114 and loading the tube onto the mandrel 96 on carriage 74.
  • hydraulic power is applied to hydraulic cylinder 88 which operates the lever system causing the hole punches 90 and 92 to punch two terminal holes in this end of the tube 71.
  • the punches 90 and 92 remain in the advanced position.
  • pneumatic power is released on the cylinder 100 allowing cylinder 116 to withdraw the tube stop 114.
  • a small pneumatic cylinder (not shown) is operated to eject the slugs from the hollow mandrel 96 into the tube 71.
  • Cylinder 100 is fully operated advancing the tube 71 into the mouth of the power press 70 beneath marking tool 80.
  • the P.L.C. instructs the operation of the power press 70 for one stroke only by use of pneumatic cylinder 78.
  • the P.L.C. then instructs pneumatic cylinder 98 to fully operate advancing the tube 71 a further 500mm through the power press 70 and loading the tube onto the mandrel of the second carriage 76.
  • the function of the second carriage 76 is to act as a slave to the third carriage 122, thereby feeding the tube 71 through the power press at indexed intervals while at the same time punching the second pair of terminal holes in the other end of the tube 71.
  • hydraulic cylinder 88 on the second carriage 76 is powered, and in a similar manner to the first carriage 74 two terminal holes are punched in the end of the tube 71. Once again the hole punches are not withdrawn at this stage. The slugs within the mandrel of the second carriage 76 are ejected in a similar manner to that in carriage 74.
  • the second carriage 76 is locked in position (at the start point closest to the press 70 common to all lenghths of tube) by the carriage lock powered by the cylinder 128 which engages with the index plates 126 provided on the rails 72 on this side of the press 70.
  • cylinder 128 is withdrawn disengaging the carriage lock.
  • the P.L.C. powers pneumatic cylinder 124 which connects the second and third carriages 76 and 122 respectively and has a stroke of 500mm, drawing the second carriage 76 500mm closer to the third carriage 122 and away from the power press 70.
  • the P.L.C. operates carriage lock cylinder 128 causing the carriage 76 to lock onto the second index plate 126.
  • the power press 70 is again operated via instructions from the P.L.C. for one stroke only, and cylinder 130 is powered to operate the lever system on carriage 122 so that the indexing lock levers 132 on carriage 122 are disenaged.
  • the P.L.C. powers cylinder 124 to extend, moving the third carriage 122 500mm away from the second carriage 76.
  • cylinder 130 is again powered by the P.L.C. to cause the indexing lock lever 132 of carriage 122 to lock in the index plates 126 on the carriage rails 72.
  • the scaffolding members are hollow tubular members, however elongate members of other than circular cross-section, and ⁇ or which are not hollow, can also be employed.

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  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Ladders (AREA)

Abstract

L'élément d'échaffaudage tubulaire (10) pour le système d'échaffaudage à tubes et à raccords amélioré décrit est pourvu de plusieurs marques indélébiles ayant la forme d'alvéoles (12) disposées à des distances d'espacement entre elles égales et prédéterminées sur la longueur du tube (10). La première alvéole (12) la plus proche de l'une des extrémités du tube (10) est située à une distance préalablement définie de l'extrémité du tube, égale à la moitié de la distance d'espacement entre les alvéoles (12) moins la moitié du diamètre du tube (10). On peut ainsi maintenir l'espacement des alvéoles en travers d'un élément d'assemblage bout-à-bout ou à l'endroit où deux tubes horizontaux (10) viennent s'abouter contre l'un et/ou l'autre côté d'un tube vertical (10). Les alvéoles (12) facilitent le positionnement à la fois en hauteur ou en longueur, ainsi que le positionnement rotatif des éléments de fixation et autres raccords sur le tube. Un nouvel élément d'assemblage bout-à-bout du type à goujon d'emboîtement (16) est également décrit. Les tubes (10) peuvent comporter des trous d'extrémités (48) indiquant que leur longueur est standard et destinés à recevoir un élément de verrouillage, de sorte que les éléments de fixation terminaux (56) peuvent être assujettis plus fiablement au tube. Un procédé et un appareil servant à convertir des tubes d'échaffaudage classiques pour qu'ils soient compatibles avec le système d'échaffaudage de la présente invention sont également décrits.
PCT/AU1990/000206 1989-05-19 1990-05-18 Systeme d'echaffaudage a tubes et a raccords WO1990014478A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019910701649A KR920701598A (ko) 1989-05-19 1990-05-18 건축용 비계부재와 그의 성형장치 및 성형방법
AU56667/90A AU655402B2 (en) 1989-05-19 1990-05-18 A tube and fitting scaffolding system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ427389 1989-05-19
AUPJ4273 1989-05-19

Publications (1)

Publication Number Publication Date
WO1990014478A1 true WO1990014478A1 (fr) 1990-11-29

Family

ID=3773924

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1990/000206 WO1990014478A1 (fr) 1989-05-19 1990-05-18 Systeme d'echaffaudage a tubes et a raccords

Country Status (3)

Country Link
KR (1) KR920701598A (fr)
MY (1) MY130124A (fr)
WO (1) WO1990014478A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2428297A (en) * 2005-07-08 2007-01-24 Colin Glenn Ogden Scaffolding erection aid
NL2000910C2 (nl) * 2007-10-09 2009-04-14 Murat Kazanci Steigersamenstel, werkwijze voor het opbouwen van een steiger alsmede gebruik van markeringen bij een steigersamenstel.
EP2980333A1 (fr) * 2014-08-01 2016-02-03 Wilhelm Layher Verwaltungs-GmbH Élement de structure, en particulier pour un echafaudage

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1349093A (en) * 1918-03-14 1920-08-10 Ostroski Michael Scaffold
US1577835A (en) * 1924-04-30 1926-03-23 Nina C Mann Scaffold
US2479962A (en) * 1946-10-17 1949-08-23 Alf M Paulson Scaffold construction
US3052315A (en) * 1957-11-25 1962-09-04 Jones Mert Elmer Swinging stage or scaffolding
US3190405A (en) * 1961-06-30 1965-06-22 Superior Scaffold Co Extendable shore
US3390741A (en) * 1967-03-14 1968-07-02 Charles A. Catapano Scaffold
US3523613A (en) * 1968-01-16 1970-08-11 Speedrack Inc Storage rack
GB1207700A (en) * 1967-09-06 1970-10-07 Kottgen & Cie G M B H Coupling device
US3807120A (en) * 1969-02-13 1974-04-30 M Viandon Scaffolding structures
AU8495475A (en) * 1974-09-20 1977-03-24 Kwinform Limited Improvements relating to scaffolding systems
US4236846A (en) * 1978-03-04 1980-12-02 B. C. Barton & Son Limited Tube joint
GB2065258A (en) * 1979-12-14 1981-06-24 Press Components Co Ltd Sleeve coupling for a pair of scaffolding members

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1349093A (en) * 1918-03-14 1920-08-10 Ostroski Michael Scaffold
US1577835A (en) * 1924-04-30 1926-03-23 Nina C Mann Scaffold
US2479962A (en) * 1946-10-17 1949-08-23 Alf M Paulson Scaffold construction
US3052315A (en) * 1957-11-25 1962-09-04 Jones Mert Elmer Swinging stage or scaffolding
US3190405A (en) * 1961-06-30 1965-06-22 Superior Scaffold Co Extendable shore
US3390741A (en) * 1967-03-14 1968-07-02 Charles A. Catapano Scaffold
GB1207700A (en) * 1967-09-06 1970-10-07 Kottgen & Cie G M B H Coupling device
US3523613A (en) * 1968-01-16 1970-08-11 Speedrack Inc Storage rack
US3807120A (en) * 1969-02-13 1974-04-30 M Viandon Scaffolding structures
AU8495475A (en) * 1974-09-20 1977-03-24 Kwinform Limited Improvements relating to scaffolding systems
US4236846A (en) * 1978-03-04 1980-12-02 B. C. Barton & Son Limited Tube joint
GB2065258A (en) * 1979-12-14 1981-06-24 Press Components Co Ltd Sleeve coupling for a pair of scaffolding members

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2428297A (en) * 2005-07-08 2007-01-24 Colin Glenn Ogden Scaffolding erection aid
NL2000910C2 (nl) * 2007-10-09 2009-04-14 Murat Kazanci Steigersamenstel, werkwijze voor het opbouwen van een steiger alsmede gebruik van markeringen bij een steigersamenstel.
EP2980333A1 (fr) * 2014-08-01 2016-02-03 Wilhelm Layher Verwaltungs-GmbH Élement de structure, en particulier pour un echafaudage

Also Published As

Publication number Publication date
KR920701598A (ko) 1992-08-12
MY130124A (en) 2007-06-29

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