FR2799783A1 - DEVICE FOR FIXING DIAGONAL BARS ON SCAFFOLDING LADDERS AND SCAFFOLDING OBTAINED - Google Patents

Abstract

Fixing assembly for diagonal bars (3) on a scaffolding comprises a clamp (19) at each end of the bars, each clamp having a jaw (29) to receive the mounting rod at the contact point with an horizontal bar. An Independent claim is also included for the scaffolding.

Description

1 2799783

  Device for fixing the diagonal bars on the ladders

  scaffolding and scaffolding obtained.

  The invention relates to a device for fixing the diagonal bars

  on the scaffolding ladders and the scaffolding obtained.

  Currently, the diagonal bars of transverse connection of the scaffolding ladders are fixed for the majority by hooks with movable jaw engaged in the ladder rungs. These systems, although they are self-locking, protrude from steps taken upwards and prevent the positioning of the scaffolding plate on

these rungs.

  The invention aims to remedy this drawback and proposes a device for fixing the diagonal bars of the scaffolding ladders, for a scaffolding comprising at least two ladders with uprights and tubular rungs and of round or close section, the ladders being connected to the one to the other vertically by at least two diagonal bars fixed crosswise and on each side of the scaffolding, the bars being fixed at their ends to ladder rungs, characterized in that it comprises a set of articulated clamps each at one end of the diagonal bars, each clamp comprising two jaws for taking up the upright arranged on either side of its axis of articulation with the bar, these jaws being spaced apart from each other by at least the width or diameter of the ladder upright tubes and at most, with little play, the width of the rung on the upright, so that the clamp can be engaged laterally on the upright, at the level of a selected rung and be maneuvered in rotation until its jaws engage on the upright, at the upper and lower levels relative to the rung, while this rung

  is enclosed by said slight clearance between the jaws.

  Said jaws are advantageously arranged on the body of the clamp in a configuration capable of ensuring two sockets on the upright opposite, or even diametrically opposite relative to the axis

of articulation of the clamp.

  It follows from this arrangement that the diagonal bars thus equipped with the clamps according to the invention are fixed automatically by simple lateral engagement of the clamp on the upright and a subsequent rotation of the latter, substantially by a quarter turn, and therefore without accessories likely to be dispersed and lost. We thus obtain a

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  good connection of the bar to the upright and to the rung of the ladder.

  with rigid fixing points for the cross-connection of the ladders for their vertical positioning with a view to supporting a

upper shelf.

  In addition, the lateral grip of the clamp being substantially that of the upright, or even very slightly greater (the thickness of the jaw branch), it does not hinder the establishment of the upper plate on the rung for fixing the bars. diagonals, unlike

  corresponding conventional devices.

  Naturally, in this arrangement, it is necessary that the jaws engage on the upright on either side of a rung of width greater than or equal to that of the uprights, at least

  for its support base on the upright.

  The hinge pin of the clamp can be provided with an inwardly projecting pin element (jaw side) and able to be received in the hole

  external rung type rungs crimped on the upright.

  This axis element can be coated with an intermediate sheath favoring the engagement and the positioning seat of the axis element

in the rung hole.

  The clamp is advantageously formed in a single piece comprising a plate element and two U-shaped jaws, formed at each end of the plate, the articulation axis being able to be constituted by a simple drilling hole or an element of axis turned inwardly projecting, as mentioned above, positioned at the median level of the plate element and receiving a fixing and articulation bolt at

the diagonal bar.

  At least one of the jaws and preferably both may (wind) comprise a clamp part turned towards the inside in its end part and with snap grip (by elastic bending of the clamp part) on the ladder upright, so that the socket lock on

  the amount of scale is automatic and easy.

  Said pliers may come from a steel sheet 2 mm thick, suitably cut and stamped, the end return of said pliers portion being slightly bent to form a point of

  hard passage and locking of the socket on the upright.

  The invention also relates to a scaffolding fitted with a

  device for fixing the diagonal bars of ladders according to the invention.

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  The invention is illustrated below using an embodiment, described without limitation and with reference to the accompanying drawings, in which: - Figure 1 is a partial side perspective view of a scaffold equipped of a device according to the invention, - Figure 2 is an enlarged perspective view of the articulated clamp of the device for fixing the diagonal bars of ladders according to the invention, and - Figure 3 is a sectional view from above of this mounted clamp

  on a scaffolding ladder post.

  A scaffolding 1 fitted with a device for fixing the diagonal bars 3 of ladders according to the invention is partially shown in FIG. 1. This scaffolding essentially comprises two vertical ladders 5, a support plate 7 for people, two lower beams of horizontal spacers fixed laterally thereto (not shown), two diagonal bars 3 mounted crosswise, one on each side, fixed to the ladder uprights at selected rungs

  11 and lateral stabilizer bars 13 bearing on the ground.

  A single diagonal bar 3 is shown.

  The ladders 5 are of the upright and rung type of round tubular section, the rungs 11 being crimped onto the uprights 9 (by an enlarged internal end base 15 and a crimping rim

external 17).

  The device of the invention relates to the diagonal bars which ensure the rigid vertical maintenance of the ladders 5 of the scaffolding. It includes clamps mounted individually at each end of the bars

  diagonals 3 and allowing attachment to the uprights 9 of the ladder.

  These all identical clamps 19 are mounted articulated by means of a bolt 21 engaged on an end plate 23 of the bars

diagonals.

  They comprise a rectangular flat body 25, pierced with an axis hole 27 in the middle, and two jaws 29 integral with the body 25 arranged on either side of the axis hole 27 and at equal distance from the latter. The set comes from a 2 mm thick steel plate

  suitably cut and stamped.

  The jaws 29 project laterally from the same side of the body. They are U-shaped, identical to each other and open

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one opposite the other.

  The jaw branch 31 remote from the body is slightly curved inward, ending in a tab 33 facing outward. The inner curve of this branch 31 corresponds to the section of the upright tube 9 of the scales (all identical) and the distance from the lug 33 to the plane of the body 25 determining the jaw opening is slightly less than the diameter of the upright tube d 'ladder. This conformation allows engagement on the upright with slight elastic bending of the jaw branch 31 when passing

  this tab on the upright. This commitment is described later.

  The articulated mounting of the clamp 19 on the diagonal bar 3 is ensured by means of a roller element 35 forming an axis element projecting from the jaw side. This element is clamped in abutment on the plane of the body 25 by the nut of the articulation bolt 21. The roller 35 is preferably coated with a sheath of diameter equal to that of the hole in the rung tube 11, which is as indicated crimped by its end to the upright 9 of scale, being slightly flattened on the inside by its base resting on the upright and clamped by an external rim 17 crimped on the outside. The sheath favors the introduction and the adjusted maintenance of

  the axis element 35 projecting into the rung hole 37.

  It should be noted that the branches 31 of the jaws extend parallel to each other, at a distance greater than or equal to the diameter of the tube of the uprights 9 of scale and equal with little play near the internal enlargement of the support base 15 of the rung end crimped on the upright. The rung tube 11 is in fact widened to allow support against the upright tube 9 clamped by external crimping. All the rungs are deformed and widened at their base identically against the upright. The jaw openings are

opposite each other.

  The assembly of the diagonal bars 3 is very simple. It suffices to engage each clamp 19 at the end of a bar on a ladder upright, at a chosen rung 11, by introducing the axis element 35 into the corresponding rung hole 37, the clamp being turned substantially perpendicular to the upright to allow lateral engagement. The jaw branches 31 thus pass on each side of the upright tube and the axis element 35 is pressed into the rung hole 37. At the bottom of the race, the internal plane of the body 25 of

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  the clamp abuts against the surface of the upright tube. It is then a question of turning the clamp according to arrows (FIG. 2) to simultaneously engage the jaws 29 in engagement on the upright tube. The clamp is at the end of assembly with its body substantially parallel to the upright. At this time, the jaw branches 31 grip the enlarged base 15 of the rung with little play and the jaws are in locked engagement

(by clipping) to the upright.

  The catch is therefore operated on the rung and the amount.

  The lateral space requirement is minimal, corresponding to the thickness of the branch (2 mm) and does not interfere with positioning

  support plate 7 on this rung.

  The locking of the socket is obtained by snap-fitting with slight bending of the jaw branches 31 when the curved legs 33 rotate on the upright tube. The assembly is therefore automatic and rapid, being carried out on the two end clamps of the same bar on one side of the scaffolding. The mounting of the other diagonal bar on the other side of the scaffolding (not shown) is

done the same way.

  The disassembly of the bars is obtained by a reverse operation

pliers.

  The invention thus provides a simple, economical and easy to use device for fixing the diagonal bars to the scaffolding ladders. Naturally, variant embodiments can be easily

  performed by a person skilled in the art within the framework of the claims

  attached. Thus, the section of the ladder posts is not necessarily circular. It can be rounded, in ellipse for example. In this case, it suffices to adapt the shape of the branches of the jaws to that of the upright tube, while retaining a curved end tab for

  the jaw locking snap on the upright.

  The jaws are not necessarily identical and one of the two can provide locking to the upright, which can be

  also provided by a means other than snap-fastening.

  Finally, the protruding pin element can be eliminated and the device can be applied to ladders with steps which are not necessarily crimped

on the uprights.

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Claims (10)

  1. Device for fixing the diagonal bars (3) of the scaffolding ladders, for a scaffolding (1) comprising at least two ladders (5) with uprights (9) and rungs (11) tubular and of round or close section, the ladders (5) being connected to each other vertically by at least two diagonal bars (3) fixed crosswise and on each side of the scaffolding, the bars (3) being fixed by their ends to rungs of ladder (11), characterized in that it comprises a set of clamps (19) each articulated at one end of the diagonal bars (3), each clamp (19) comprising two jaws (29) for taking up the upright (9) arranged on either side of its axis of articulation to the bar, these jaws (29) being spaced from each other by at least the width or the diameter of the upright tubes (9) of scale and at most, with little play, the width of the rung (11) on the upright, so that the clamp (19) can be engaged lat generally on the upright (9), at a selected rung (11) and be maneuvered in rotation until its jaws (29) engage on the upright (9), at the upper and lower levels relative to the rung (11), while this   rung (11) is enclosed by said slight clearance between the jaws (29).   2. Device for fixing the diagonal bars of scaffolding ladders, according to claim 1, characterized in that said jaws (29) are disposed on the body (25) of the clamp in a configuration suitable for ensuring two sockets on the upright (9) opposite, or even diametrically opposite relative to the axis of articulation of the clamp. 3. Device for fixing the diagonal bars of ladders   scaffolding, according to one of claims 1, 2, characterized in that   the axis of articulation of the clamp (19) is provided with an axis element (35) projecting inwards, jaw side, and capable of being received in the external hole (37) of step of the Ladders of the type with steps set on the upright. 4. Device for fixing the diagonal bars of scaffolding ladders, according to claim 3, characterized in that said axis element (35) is a roller bearing on the body (25) of the clamp   by means of a hinge bolt (21) from the clamp to the bar.   5. Device for fixing the diagonal bars of ladders 7 2799783   scaffolding, according to one of claims 3, 4, characterized in that   said axis element (35) is coated with an intermediate sheath favoring the engagement and positioning seat of the axis element (35) in the rung hole (37).   6. Fixing device for diagonal ladder bars   scaffolding, according to one of the preceding claims, characterized   in that the clamp (19) is formed in a single piece comprising a plate element (25) and two U-shaped jaws (29), formed at each end of the plate (25) and open one to the other opposite the other, the articulation axis possibly being an axis element (35) projecting inwards, or a simple drilling hole (27), positioned at the median level of the element plate (25) and receiving a bolt (21) of   attachment and articulation to the diagonal bar (3).   7. Device for fixing the diagonal bars of scaffolding ladders, according to claim 6, characterized in that the clamp (19) comes from a steel sheet 2 mm thick, suitably cut and stamped.   8. Device for fixing the diagonal bars of ladders   scaffolding, according to one of the preceding claims, characterized   in that at least one of the jaws (29) and, preferably both, comprises a clamp part (31) turned inwards in its end part and with a snap-on grip (by elastic bending of the clamp part) on the ladder post (9) so that the locking   of taking on the amount (9) of scale is automatic and easy.   9. Device for fixing the diagonal bars of scaffolding ladders, according to claim 8, characterized in that at least one of the jaws (29) has a slightly curved end portion (33) to form a point hard passage and locking from the socket on the upright (9).   10. Scaffolding, characterized in that it comprises a device for fixing the diagonal bars of ladders, as defined in one   any of the preceding claims.