EP3192942B1 - Scaffold comprising two sets of ladders kept spaced from one another by a pre-assembled collapsible base - Google Patents

Description

The invention relates to a scaffolding system according to the preamble of claim 1 and to a method of mounting said scaffolding system according to the preamble of claim 5.

The document GB2479202 discloses such scaffolding. The folding base has a hinge about a vertical axis, so that when the ladder assemblies are brought against each other, the base is folded into two parts in planes parallel to the planes of the ladder sets. .

The Applicant markets under the name ILLICO scaffolds thus comprising two scale assemblies held at a distance by a pre-assembled folding base, arranged so that in the closed state, the folding base is maintained in the vertical plane, perpendicular to the plans of scale sets. This makes it possible to release a relative volume between the scale assemblies in the closed state, thus making it possible to accommodate a tray folded in two, for example. In addition, when the scale sets are brought against each other, the risk that these sets do not remain in parallel planes between them is relatively low.

US 3,071,206 A discloses a scaffolding system according to the preamble of claim 1 and a method of mounting said scaffolding system according to the preamble of claim 5.

There is a need for a scaffolding system thus able to move from a closed state to an open state, and providing greater security without sacrificing compactness in the closed state.

There is provided a scaffolding system according to claim 1.

Thus, the folding base is pre-assembled and when the ladder assemblies are moved away from each other, the folding base is brought and locked in its open position. Unlike the ILLICO product, which involves manual locking operations of slashes, there is no need for dedicated operator gestures, which ensures greater security.

In addition, this sliding link arrangement implies that when the scaffold is open or closed, the element of the folding base integral with the first slide member is driven in movement, relative to the second slide member, over a distance. The lock can thus be engaged relatively precisely during the life of the system, which would not necessarily be the case if the lock was engaged solely by a pivot link type mechanism.

In addition, the folding base can be relatively high in the open state, thus making it possible to better stabilize the scaffolding system without the folding base in the closed state occupying a space beyond the scale assemblies. The folding base elements can be folded down from the when this system is closed, without compromising the stability of the system in the open state.

The invention can thus make it possible to reconcile security and compactness in the closed state.

Advantageously, the scaffolding system can be arranged so that once the locking is engaged, the blocking can be undone following an unlocking command, for example a manual unlocking operation.

At least one, and preferably each, scale assembly comprises a plurality of ladder portions slidable relative to one another, thereby allowing the scaffold system to be deployed at a height. For a given maximum scaffolding height, the scaffolding system can be relatively compact in the closed state if furthermore each scale assembly is then retracted.

• un côté à partir duquel s'étendent les échelons, dit flanc, et,
• de part et d'autre du flanc, deux autres côtés, dits champs.

For example, the amounts can each define, in a plane normal to the longitudinal direction, a profile with:

• a side from which extend the ladder, said flank, and,
• on either side of the flank, two other sides, called fields.

At least one amount of at least one ladder portion may define on one of its fields a male slide member, and at least one amount of at least one other ladder portion of the same ladder assembly may be profiled in the longitudinal direction so as to define on one of its fields, opposite the field defining the male slide element, a female slide element. The scaffolding system is arranged so that the male slide member cooperates with the female slide member so that the ladder portions corresponding to these slide members can slide relative to each other in the direction longitudinal amounts.

According to an arrangement which does not form part of the invention, each set of scale can form a rigid whole. The second slide element is integral with an amount of a ladder assembly. Thus the element of the base secured to the first slide element can it form a slide, drivable in translation, with respect to this set of scale.

The second slide element is in one piece with a stud. The slide connection can thus be relatively robust and the logistics simplified.

According to the invention, a multi-scale ladder assembly sliding relative to each other is provided in that the posts define male and female slide elements, and cooperate with one another by means of these elements of male and female slide to ensure a height deployment. One of these slider elements defined by an amount is used as the second slider element. At least one and preferably each upright can define a male slide member and a female slide member.

The second slide element is an unused slide element for height deployment belonging to a ladder portion for sliding relative to a single other ladder portion, for example the lowest ladder portion or the highest ladder portion when the scaffold is extended in height. In other words, the scaffolding system comprises at least one amount defining a male slide element and a female slide element, and cooperating with a single other amount by means of one of these male and female slide elements, the other of these elements being used as the second slide element.

This other element used as a second slide element may for example be a female slide element, for example a rail defined in the amount.

In another embodiment which does not form part of the invention, the second slide element may for example be integral with an element of the folding base distinct from the element integral with the first slide element. In other words, a sliding connection can be provided between two elements of the folding base. This can allow to provide a single locking point for the entire folding base, and thus to facilitate unlocking.

Advantageously, the elements of the folding base are mounted in rotation relative to each other. The folding base can thus be of relatively simple design, and robust over time.

The folding base remaining in the same vertical plane, its elements can be mounted in rotation about an axis normal to this plane, for example an axis parallel to the longitudinal direction of ladder ladder steps.

The invention is however not limited to articulated bases. For example, it is possible to provide that the folding base comprises several telescopic tubes one inside the other, forming in the deployed state a spacer bar between the two sets of ladders. The locks between these tubes can then be undone and the base retracted until the distance between the ladder assemblies is substantially close to the length of the longer tube. In this case, the so-called folding base is devoid of joints, but nevertheless defines sliding links leading when the ladder assemblies are moved away from one another to the locked positions.

Advantageously and in a nonlimiting manner, the folding base may comprise at least one, advantageously at least two, bar-type elements, generally rod-shaped.

Advantageously and in a nonlimiting manner, the folding base can be arranged so that when the scaffolding system is in the open state, at least one bar-like element extends in a direction having a component in the longitudinal direction of the amounts of scale sets, that is to say a vertical component when the scaffolding system is laid without level shift on horizontal and level ground. In other words, the folding base occupies a certain height in the open state, making it possible to better stabilize the scaffolding.

The scaffolding system may advantageously be arranged such that when the ladder assemblies are moved closer together or away from each other, the first slide member is driven in motion, relative to the second slide member, in a direction having a component in the longitudinal direction, for example in this longitudinal direction.

Advantageously and in a nonlimiting manner, the folding base can be arranged so that when the scaffolding system is in the open state, at least one, advantageously at least two, bar-type elements are oblique (s) ) in relation to the amounts of the scale plans. This may allow to distribute the forces on a certain folding base height, and thus to better stabilize the scaffolding.

Advantageously and in a nonlimiting manner, the scaffolding system may comprise articulation elements between the ladder assemblies and respective elements of the folding base. In particular, the bar-type elements may be pivotally mounted on respective ladder assemblies.

Advantageously, the folding base may comprise two first bar members pivotally mounted on the respective two scaffold assemblies, and two second bar members pivotally mounted on the respective two scaffold assemblies.

Advantageously, the first bar-type elements, or rods, may be mounted at one or more height (s) of the amount (s) of amount to which (or to which) can be mounted the second elements of type closed off. The difference between these two heights may correspond to the height of the folding base in the open state.

Advantageously, the first bar-type elements may be mounted hinged together, for example by their opposite ends to the pivotally mounted ends on the respective scale assemblies.

Advantageously, the second bar-type elements may be mounted hinged together, for example by their opposite ends to the pivotally mounted ends on the respective scale assemblies.

In one embodiment, each second bar-type member may be hingedly mounted to a corresponding first bar-type member. In this case, the folding base can have a general shape of pantograph.

The bar elements can then be identical or similar, so that the folding base is relatively simple in design.

Advantageously and in a nonlimiting manner, the slide elements may be arranged and arranged so as to allow the translation movements of one of the second bar elements relative to the corresponding scale assembly. A slide connection may advantageously be provided between each second bar-type element and the corresponding scale assembly. The scaffolding system can thus comprise two first slide members, at the ends of two respective second bar elements and cooperating with second slide members integral with the two respective scale planes.

In another embodiment, the folding base may comprise a spacer element, for example a vertical or oblique rod, mounted hinged at one end to a first bar-type element and at the other end to a second element-type closed off. This spacer element can make it possible to maintain these first and second bar elements parallel to each other.

Advantageously, the spacer element may be mounted hinged at one end to the first two bar-type elements, for example at their ends, and at the other end to the two second bar-type elements, for example at their ends.

According to an arrangement which does not form part of the invention, the folding base may further comprise at least one (and advantageously two) bar-like element arranged obliquely with respect to the longitudinal direction of the amounts of the ladder assemblies when the scaffolding is open, which is secured to the first slide element. The second slide member may be integral with the spacer member. This oblique element thus defines a sliding connection with the spacer element.

The first slide member may be male, in which case the second slide member is female, or vice versa.

Advantageously and in a nonlimiting manner, the locking device may comprise a pin mounted on spring, integral with one of the first and the second slide element, and a locking plate defining an orifice for receiving the pin, this plate being integral with (for example in one piece with, or secured to) the other of the first and second slide element. When the second position is reached, the orifice is in front of the pin, so that the pin automatically engages in this hole, thus ensuring the blocking of the slide elements.

Advantageously and without limitation, the locking device may comprise a gripping member, for example a ring for receiving a finger, integral with the pin, to allow a user to remove the pin from the hole.

Advantageously, the scaffolding system may further comprise a set of guardrails.

Advantageously, this set of railings may comprise railing posts, at least one railing post being assembled to a corresponding scale amount by a partial link so that when only one of the ladder sets is being deployed, the amount of guardrail is driven in motion relative to the amount of scale, said movement continuing at least until the difference in heights between the ladder sets reaches the locking pitch, to compensate for this difference in height.

The invention is in no way limited by this arrangement of integrating games at the base of the guardrail.

Advantageously, the guardrail assembly is able to move from a lowered position to a raised position, and this by a rotation of at least one railing post about an axis normal to the longitudinal direction and having a parallel in the plane of one side of the railing.

The invention is in no way limited to this articulation, even if it makes it possible to have a relatively rigid and straight railing.

There is further provided a method of mounting a scaffolding system according to claim 5.

• La figure 1 montre un exemple d'échafaudage selon un premier mode de réalisation de l'invention.
• La figure 2 montre une partie de l'échafaudage représenté sur la figure 1, à l'état fermé.
• La figure 3 montre une partie de l'échafaudage représenté sur la figure 1, à l'état ouvert.
• La figure 4 montre une partie d'un exemple d'échafaudage selon un deuxième mode de réalisation qui ne fait pas partie de l'invention, à l'état fermé.
• La figure 5 montre la partie de l'échafaudage représentée sur la figure 4, à l'état ouvert.
• La figure 6 est une vue en perspective d'un détail de l'échafaudage illustré par les figures 2 et 3
• La figure 7 montre un exemple d'échafaudage proche de celui de la figure 1, en cours de montage.
• La figure 8 est une vue de profil de trois montants de trois portions d'échelle respectives de l'échafaudage de la figure 1.
• La figure 9 montre un exemple d'élément d'assemblage entre un garde-corps et une partie d'échelle de l'échafaudage de la figure 1.
• La figure 10 montre une partie de l'exemple d'échafaudage de la figure 1, en cours de montage.
• La figure 11 montre l'échafaudage de la figure 7, à l'état compact et de face,
• La figure 12 montre l'échafaudage de la figure 7 à l'état compact, vu de profil.
• La figure 13 est une vue en perspective d'une partie haute du système d'échafaudage de la figure 1.
• La figure 14 est une vue en perspective d'un exemple de base pliante pour un système d'échafaudage selon un mode de réalisation qui ne fait pas partie de l'invention, proche de celui des figures 4 et 5.
• La figure 15 montre l'élément d'assemblage de la figure 9, lorsqu'installée entre deux montants.

The invention will be better described with reference to the figures, which relate to embodiments given by way of example and not limiting.

• The figure 1 shows an example of scaffolding according to a first embodiment of the invention.
• The figure 2 shows some of the scaffolding shown on the figure 1 , in the closed state.
• The figure 3 shows some of the scaffolding shown on the figure 1 , in the open state.
• The figure 4 shows a part of an example of scaffolding according to a second embodiment which does not form part of the invention, in the closed state.
• The figure 5 shows the part of the scaffolding shown on the figure 4 , in the open state.
• The figure 6 is a perspective view of a detail of the scaffolding shown by the Figures 2 and 3
• The figure 7 shows an example of scaffolding close to that of the figure 1 , being edited.
• The figure 8 is a profile view of three uprights of three respective scale portions of the scaffolding of the figure 1 .
• The figure 9 shows an example of an assembly element between a railing and a ladder part of the scaffold of the figure 1 .
• The figure 10 shows part of the scaffolding example of the figure 1 , being edited.
• The figure 11 shows the scaffolding of the figure 7 , in the compact and frontal state,
• The figure 12 shows the scaffolding of the figure 7 in the compact state, seen in profile.
• The figure 13 is a perspective view of an upper part of the scaffolding system of the figure 1 .
• The figure 14 is a perspective view of an example of a folding base for a scaffolding system according to an embodiment which does not form part of the invention, close to that of the Figures 4 and 5 .
• The figure 15 shows the assembly element of the figure 9 , when installed between two uprights.

Identical references may be used from one figure to another to designate identical or similar elements, in their form or in their function.

With reference to the figure 1 , which relates to a first embodiment, a scaffolding system 1 comprises a tray assembly support, comprising two sets of scales 10, 11, facing one another, and kept at a distance each other thanks to an articulated spar 160 and to a folding base 60.

In this first embodiment, the folding base 60 defines a pantograph, and comprises bar-type elements, here rods 41, 41 ', 141, 141', articulated, secured to the uprights 120, 130 of the ladder assemblies. 10, 11 by hinge members 42, 43.

The scaffolding device further comprises stabilizing elements 40 and remote wheels 50.

Each scale assembly 10, 11 comprises a plurality of scale portions 100, 101, 102, and 110, 111, 112, here three scale portions. Each ladder portion 100, 101, 102, 110, 111, 112 comprises two uprights 120, 121, 122, 130, 131, 132 and rungs 3 forming a spacer between the uprights.

The invention is not limited to a number of steps sufficient to allow user access for each scale plan. One could provide a possible access to one side of the scaffold, or in no way, the access may for example be made possible by an additional device, staircase type or other. In other words, the terms "scale set", "scale plan", "scale part" etc. are at interpret as covering any rigid frame with two uprights and at least one spacer element, typically at least two steps.

On the other hand, the scale assemblies can support the entire plateau directly, i.e., the plateau assembly is in contact with the scale sets, or indirectly. In the latter case, there may be intermediate pieces between the tray assembly and the ladder assemblies, for example a lower part of the guardrail assembly.

In the same way, ladder assemblies can support the guardrail assembly directly or indirectly.

The steps 3 can be attached to the uprights 120, 121, 122, 130, 131, 132 by welding. In an embodiment not shown, it may provide a fastening by riveting, or other.

The ladder portions 100, 101, 102, and 110, 111, 112 of the same scale assembly 10, 11 are slidable relative to one another in pairs.

Locking means, here hooks 150 pivotally mounted on the ladder portions intended to be raised, and able to engage with two rungs of two adjacent ladder portions (one rung of the ladder portion on which is mounted hook and a rung of the adjacent ladder portion of the inner side of the scaffold) prevent extended ladder portions from falling back under the effect of gravity. These hooks can thus ensure locking for several scaffold heights, the pitch between these heights being the inter-rung distance.

In an embodiment not shown, it could further provide a pin system and holes in the amounts, to block any movement between two adjacent ladder portions.

The scaffolding system 1 further comprises a tray assembly 30 with a hatch, not shown on the figure 1 , defined in the floor of the board.

The ladder system 1 further comprises a guardrail assembly 21 comprising guard rails 270, rails 21, 22, underlays 24, 25 and reinforcement bars 23.

The Figures 11 and 12 show a scaffolding close to the scaffolding system shown on the figure 1 in the compact state. These scaffolding systems are one-piece, with the exception of the tray assembly 30 which is detachable, i.e., with the exception of the tray assembly 30, each of the elements of these Scaffolding systems is secured by a link that can not be easily defeated to the rest of the scaffolding system. In other words, the scaffolding of the figure 1 is devoid of items likely to be lost, except for the set of trays 30 which is detachable.

The one-piece scaffolding 1 Figures 11 and 12 is in the folded state, in the form of a cube in the form of a pad of dimension 0.98 x 0.92 x 1.38 meter for example and provided with four swivel wheels and adjustable in height 50.

To mount this scaffolding, we start from the closed and folded state corresponding to the representation of Figures 11 and 12 by moving away from one another the scale assemblies 10, 11 in the direction of the length (direction z on the mark of the figure 1 ), thus moving from the closed state to the open state.

The Figures 2 and 3 on which the scaffolding system is only partially represented, allow to better visualize this first step of the assembly.

When the scale assemblies 10, 11 are so far from each other along the length direction, the folding bases 60 unfold in this direction z.

The scalding system is arranged so that the rods 41, 41 ', 141, 141' of the folding base 60 are pivotable relative to the ladder portions 110, 130 to which they are attached.

The rods 41, 41 'are pivotally mounted at a first height, near the highest rung of each ladder portion 100, 110.

The scaffolding 1 comprises the fixed hinge elements 42, secured to the uprights 120, 130 and simply allowing a pivoting around the x direction. In other words, these hinge members 42 retain their position during the step of moving the ladder portions 120, 130 away from each other.

The rods 141, 141 'are pivotally mounted on the uprights 120, 130, respectively, by means of movable hinge elements 43, the detail of one of which is illustrated by the figure 6 .

These movable hinge elements 43 are arranged to support a pivoting movement of the adjoining rod 141 around the x direction, and also to support a translational movement in the y direction relative to the corresponding upright 120, 130.

With reference to the figure 6 , the amount 130 thus defines, in one side of its profile, a female slide element, here a flanged groove 62. This flanged groove receives a male slide element, here a T element 142, in one piece with the movable hinge member 43.

The movable hinge element 43 can be obtained by producing a profile defining the T-element 142 and two surfaces 242 facing each other, then by installing between these surfaces 242 a rod otherwise received in a bore of the articulated rod 141, to allow rotation about the x-axis of this rod 141.

To return to the figure 3 , the folding base 60 is thus fixed to two uprights 120, 130, by means, for each upright 120, 130, of a fixed hinge element 42 and of a movable hinge element 43.

In this example, the fixed hinge member 42 is secured for example by welding to the corresponding amount 120, 130 substantially at the level of the highest step 3 of the corresponding scale portion, 100, 110, while the movable hinge member 43 is likely to be translated upward in the y direction when the ladder portions 100, 110 are spaced from each other.

With reference to the figure 6 , it can further provide a locking device 300 is set up automatically at the end of movement.

The locking device may for example comprise a pin 301 mounted on a spring not shown, and a plate 302 defining an orifice (not visible on the figure 6 ) the plate 302 is fixed on the slide member 43. When this element 43 reaches an end position, the non-visible hole is opposite the pin 301. Due to the forces exerted by the spring, the pin 301 is embedded in this orifice, thus ensuring the blocking of the element 43, and therefore of the rod 141.

The plate comprises a projecting portion 303, abutting against an edge of the element 43, in order to prevent the plate 302 from being pivoted with respect to this element 43.

To unlock the element 43, an operator can pass a finger in the ring 304 and cause the pin 301 out of the hole. The operator will have to drive the rod 141 while moving the pin 301 out of the hole to prevent re-locking in the open position.

Such a system involving a sliding connection and an automatic locking at the end of the race may be more reliable than the prior art in which human intervention was necessary, the operator coming to fix rods by means of pins. In addition, the time saving during assembly can be appreciable. On the other hand, a manual unlocking is provided for security reasons.

When the articulated spar 160 is deployed horizontally, a locking can be implemented at its articulation to prevent folding and thus provide a spacer function between the ladder portions 100, 110.

In a second step, when the scale assemblies 10, 11 are thus separated from one another by a distance corresponding to the length of the plate assembly 30, a platform of the set of plateau 30 on the highest rungs 3 of the ladder portions 102, 112.

More specifically, the tray assembly 30 comprises two parts and a hinge for folding these two parts against each other by a rotational movement about the x axis when the tray assembly is oriented in what will be its position of use. The tray assembly can thus be stowed when in the folded state, in the tile-like structure, as illustrated in FIG. figure 12 .

The platform can be placed by means of hooks 71 on the highest steps 3 of the ladder portions 102, 112.

Once the tray is installed, the guardrail assembly 20 can be raised.

In the folded state, this assembly 20 comprises two subassemblies 220, 221, each corresponding to a respective scale plane 11, 10 (see FIGS. Figures 10, 11 and 13 ). The subassembly 220 comprises two amounts 270, 273 in the continuity of the two amounts 122, 122 'of the ladder portion 112, and the amounts 271, 272 of the subassembly 221 are in the continuity of the amounts 132, 132' of the scale part 102.

Each subassembly 220, 221 comprises a rail 21, 22, a corresponding sub-smooth 25, 24, as well as reinforcement bars 23 forming a spacer between these smooth and those under smooth.

More specifically, as illustrated in figures 7 , 10 and 13 , the rail 22 and the sub-smooth 24 each define a hinge 26 for folding a railing portion 201 of the subassembly 221 comprising the rail 22 and this smooth under 24 on itself.

In the same way, a guard part 202 comprising the rail 21, the sub-rail 25 and the corresponding reinforcement bars 23 can be folded back on itself by means of similar articulation 26.

The upright 271 forms with rod-like elements 272, 274, 275, here another upright 272 and spacer elements 274, 275, a railing frame in the continuity of the scale plane 10.

The upright 273 forms with rod-like elements 270, 276, 277, here another upright 270 and spacer elements 276, 277, another railing frame, this time in the continuity of the scale plane 11 .

In the compact state, these railing portions 201, 202 are folded back on themselves. Each railing portion 201, 202 is secured by a non-removable link 223, 224 to a corresponding upright 271, 273, this non-removable link 223, 224 defining a hinge about a direction close to and parallel to the longitudinal direction of this amount 271, 273, so that in the compact state, the guardrail portion 201, 202 folded back on itself by the hinge elements 26 can be folded against the corresponding railing frame.

In addition, each railing subassembly 221, 220 is attached to the corresponding ladder assembly 10, 11 by an x-joint at the member 28, allowing the rigid railing frames and sleeved sets folded over these railing frames to pivot about axes (D1), (D2), respectively, through the outside of the scaffolding system 1.

These axes (D1), (D2) are each parallel to a line lying both in a plane defined by the plateau (horizontal plane, or normal plane to the longitudinal direction of the uprights if they are vertical) and in a plane defined by the corresponding railing frame.

Thus, in the compact state, the guardrail subassemblies 220, 221 are folded against the different ladder portions 120, 121, 122 and 100, 101, 102, thus making it possible to obtain a relatively large scaffolding system. compact as illustrated on the Figures 11 and 12 .

Once the scale planes 10, 11 are distant from each other (open state) and once the tray is installed, each subset of guardrails is rotated around the x direction, so that the posts bodyguard 270, 271, 272, 273 extend in the extension of the uprights 122, 132 as illustrated in FIG. figure 7 .

It is then possible to rotate around the upright 271, 273 corresponding to each part of railing 201, 202 folded on itself, then to unfold, by means of the joints 26, these railing parts 201, 202, so that they occupy the entire length of the scaffolding system 1.

The railing portions 201, 202 are then fixed by their end 204, 205 opposite the end secured to the corresponding amount 271, 273, the amount 270, 272 of the other respective scale plane by means of fastener 208, for example wire locks.

The guard can be put in place by a technician who remains on the ground, which corresponds to a level 3 security.

Once the railing is installed, it is possible to deploy the scaffolding system 1 upwards.

The ladder portions 100, 101, 102, and 110, 111, 112 are slidable relative to one another. More specifically, each upright 120, 121, 122, 122 ', 130, 131, 132, 132' comprises a metal section such as the profiles represented on the figure 8 . This figure shows the sections of three uprights 120, 121, 122 when the respective ladder portions 110, 111, 112 are against each other.

Each post profile 120, 121, 122 comprises sides 63 or fields, and sides 64 or sidewalls, the fields 63 being of smaller dimensions than the blanks 64.

The posts 120, 121, 122, 122 'and 130, 131, 132, 132' are oriented such that the planes of the respective fields 63 are substantially normal to the z direction.

The section of each upright 120, 121, 122 has a recess, or groove, 62 defined in a field with flanges 66 partially closing the recess 62, and a slider member 65 defined in the field 63 opposite the defining field. recess 62 of this amount.

As illustrated on the figure 8 the slide member 65 of a post 121,122 is inserted into the flanged groove 62 of the respective adjacent post 120,121 so that the post 121 is slidable relative to the post 120 and the post 122 can slide relative to the amount 121.

The uprights 120, 121, 122, 130, 131, 132 define, besides a flanged groove 62 on a field, two recesses 61 in the respective two opposite flanks. These recesses 61 allow to receive the steps 3.

Thus, the uprights 120, 121, 122, 130, 131, 132 define two-to-two cooperation means, directly in their normal sides to the length of the scaffolding, here flanged grooves 62 and slide elements 65.

These amounts 120, 121, 122, 130, 131, 132 can thus be of the same width so that it is not necessary to provide several dimensions of step 3.

Moreover, as we see on the figure 8 each of the uprights defines both a flanged groove 62 and a slide member 65, so that the uprights 120, 121, 122, 130, 131, 132 may be identical to each other. This can make it possible to provide a single scale portion model 100, 101, 102, 110, 122, 112, so that the logistics and supply for manufacturing can be relatively simple.

The fields of the intermediate post 121 receive a surface treatment to facilitate the sliding of the amounts relative to each other. This surface treatment is not applied to the flanks of this amount 121, nor to the amounts 120, 122.

In another embodiment, the uprights 120, 121, 122 all receive an identical surface treatment on only one of their fields, for example on the fields corresponding to the T parts 65.

To deploy the scaffolding system in height, it is expected to slide an external amount 102 or 112 relative to the adjacent amount 101 or 111 respectively, a height corresponding to the height between two adjacent rungs 3, as illustrated by the figure 10 .

In order to prevent such an offset from introducing tensions into the guardrail assembly 20, there are provided connecting elements 28 connected to the respective uprights 130, 132, defining partial links allowing relative movements between the railing posts 270-273 and the ladder posts 122, 122 ', 132, 132' on which these railing posts are installed. Thus, the guardrail assembly 20 can be designed relatively rigidly, because the voltages induced by the height offsets during the vertical deployment will be absorbed by movements of the guardrail relative to the amounts of scale.

With reference to Figures 9 and 15 , the assembly element 28 comprises a part 435 intended to be secured to the upright 271 without any particular clearance, for example by means of a rod fixed by riveting 440 to the upright 271, or the like, and a part 433 intended to cooperate with the amount 132.

When a latch 434 is raised, these parts 433, 435 are rigidly secured to one another, and the element 28 forms a rigid whole.

The part 433 defines with the amount 132 a partial connection, so as to absorb the movements induced during the deployment of scale plans.

The element 28 comprises a central portion with flanges 438, intended to be inserted between the uprights 271 and 132.

The piece 433 defines a recess 436 to receive a rod (not shown) fixed by riveting 432 or solder to the post 132.

This recess 436 is arranged high enough so that when this piece 433 is (partially) received in the post 132, and the rod is received in the recess 436, the lower rim of the portion 438 remains remote from the upper end of the recess 436. amount 132, as illustrated by the figure 15 .

On the other hand, the upper edge of this central portion 438 may be in contact with the lower end of the upright 271.

The element 28 is thus capable of moving relative to the amount 132.

Foreseeing an articulation with such obvious games can thus make it possible to design a relatively rigid set of railings. This avoids having to distribute games on the smooth and under-smooth. This can be more comfortable and reassuring for users.

Thus, an operator can mount a ladder portion of one of the ladder planes by a height corresponding to the height between two respective rungs, then pass on the other side of the scaffolding system and raise the part of the ladder. this time the scale is twice the height between two respective steps. The scaffolding can thus be deployed in height by one person.

The element 28 further defines a pivot connection for the rotation of the guardrail frame to move from the lowered position to the raised position, and vice versa.

More specifically, the piece 28 is in two pieces 433, 435, mounted articulated on a rod 437.

The latch 434 comprises a non-visible hook and blocking, in the locked position, a rod 439, for locking parts 433, 435 relative to each other.

When the handle of this latch 434 is lowered, the part 435 can pivot about the axis (D1). As this piece is integral with the railing frame including the amount, this rotation can help to tilt the railing frame.

When deploying the height of the scaffolding system, it is possible to install the stabilizers 40, in a manner known per se.

During the deployment at height, the outermost ladder portions 102, 112 and the intermediate ladder portions 101, 102 are started.

As is apparent from the figure 1 the lowest scale portions 101, 102 are the least spaced ladder portions of each other. This allows a user of a scaffolding device accessing a tray assembly 30 via the hatch defined in the floor, to access this hatch in a relatively comfortable manner and especially to descend from the scaffold in a relatively secure manner. This stair arrangement can be relatively interesting for a user accessing the tray through the inside of the scaffolding. This can thus make it possible to provide a relatively simple tray access of the hatch type that is simpler and less restrictive to implement than a platform access of the gate type on guardrails.

In addition, the scaffolding device 1 comprises two pre-assembled diagonals 170.

Each diagonal includes a large diameter tube 171 and a small diameter tube 172 installed in the large diameter tube. The small diameter tube of the diagonal may have a diameter for example of 40 mm and the large diameter tube of the diagonal may have a diameter for example of 50 mm.

The large diameter tube 171 is pre-mounted on a lower scale portion, 100 or 110, while the small diameter tube 172 is pre-mounted on an uppermost scale portion 102 or 112.

In the folded state, the tubes of small diameter and large diameter are separated from each other, each tube remaining simply secured to the corresponding portion of scale.

When the ladder portions are deployed in height, the free end of the smaller diameter tube is inserted into the free end of the larger diameter tube. It will be possible to leave the tubes free to move relative to each other until the deployment at height is completed.

A pin system is used to define the length of the diagonal thus formed by these two tubes by blocking relative movements. This locking can be performed when the scaffold 1 has reached the desired height.

Several holes are provided in the larger diameter tube, allowing the length of the diagonal to be adjusted before locking.

This attachment of the diagonals to the ladder portion may be advantageous compared to a fixation with respect to a pre-assembly on the plate only, Indeed, this telescopic diagonal can be pre-assembled and when the plate is moved, the Fixing between the diagonals and the rest of the scaffolding does not need to be defeated. The installation of the diagonals is between independent of the plateau set, which can be more secure.

Also, it may be noted that during the vertical deployment, it is not necessary to uncouple the same tubes of the same diagonal, but simply to leave unlocked the tubes or to unlock to allow these tubes to slide one relative to each other.

The scaffolding system can thus be installed in a relatively simple, fast and intuitive manner and while satisfying a high level of safety requirement.

Thanks to the folding of each subset of railings 220, 221 against the ladder parts, by a rotation about the x axis, one can provide a monobloc guardrail. In other words, the guardrail is independent of the slide system between the ladder parts of the ladder planes of the scaffold. This can help to reconcile compactness and height. Thus, the scaffolding system according to the first embodiment of the invention can reach a height of the order of 3 meters, and while remaining relatively compact in the folded state.

It can be seen that since the member 28 is attached to both a guardrail subassembly and a ladder plane, the guardrail assembly 20 is also pre-mounted, i.e. say that it is not possible for the user to misplace it, thus offering greater security.

The Figures 4 and 5 illustrate an alternative embodiment which does not form part of the invention in which the pantograph 60 (or accordion) folding base has been replaced by a folding base 60 'with a spacer element, here a vertical rod 39. figure 14 relates to an embodiment close to that of the Figures 4 and 5 and will be commented simultaneously. On the figure 14 the folding base shown corresponds to the open state.

Like the folding bases 60, the folding bases 60 'remain in the vertical plane (yz) when the scale planes 10, 11 are spaced from each other along the length z.

More specifically, the folding base 60 'comprises first bar-type elements, here rods 45, 45', articulated in x about a hinge 36, and second bar-type elements, here rods 38, 38 ', hinged in x about a hinge 37. The hinges 36 and 37 are located at the ends of the vertical rod 39.

The folding base 60 'further comprises two diagonal rods 44 fixed by a hinge 46 to the rods 45 (or, in not shown embodiments, to the uprights 120, 130).

The other end of these rods 44 is secured to a slide member 53, this element 53 defining a recess in which the rod 39 is received so that this element 53 is able to slide along the vertical rod 39.

As illustrated on the figure 4 , in the folded state, the rods 44 are folded against the rods 45.

When the scale planes are distant from each other, the vertical rod 39 slides relative to this element 53, and up to a locking position.

More specifically, the element 53 comprises a slide element here a ring 153, cooperating with another slide element, here the vertical rod 39. More specifically, the ring 153 defines a recess opening, and the vertical rod 39 is received in this recess so as to slide relative to the ring 153.

On the ring 153 is fixed rigidly a support piece 154, on which the rods 44 are pivotally mounted.

The rod 39 defines an orifice that is not visible in the figures, and the ring defines an orifice 403. A pin 401 mounted on a spring 402 can be received in these orifices when they are opposite one another, thus ensuring a triggered lock simply because the ring 153 has reached a predetermined position relative to the rod 39.

A door knob component 404, against which the spring 402 presses, may be manually pushed toward the ring 153 to provide unlocking.

The diagonal bars 44 make it possible to maintain the scale planes at a distance.

The scale planes are further separated by two bar members 48, 48 'also articulated and also able to fold against each other by means of a hinge 49 as shown in FIGS. Figures 4 and 5 .

Like the pantograph type folding base, the base 60 'is held in the vertical plane and defines a slide connection for automatically bringing the folding base to a locking position. The lock is set up automatically at the end of the movement, allowing you to reconcile time savings and safety.

More generally, it can further be noted that the (or the, in the embodiment of the figure 7 ) folding base (s) 60 remain (s) in the vertical plane (yz). Each folding base is entirely pre-assembled thanks to the sliding links 43. Thanks to these slide links, each of the rods of the folding base is brought to its position in the automatically deployed state, without particular intervention of the operator.

To return to the figure 1 the wheels 50 are offset by means of adjustable rods, thus allowing the level shifts of the scaffolding system 20. The wheels 50 are pivotable and adjustable in height.

The wheels 50 being offset to the outside, the forces can be better supported and the risk of tilting is lower.

The scaffolding system 1 and the system according to the other embodiments shown can thus be relatively compact in the folded state while having a certain height here of the order of 3 meters in the deployed state and this while complying with the EN 1004 standard.

Claims (5)

1. Scaffolding system (1) comprising
   two ladder assemblies (10, 11) facing one another, these being intended to support a deck assembly (30), the scaffolding system being arranged in such a way as to be able to pass from a closed state, in which the two ladder assemblies are close together, into an open state, in which the two ladder assemblies are distant from one another, at least one ladder assembly comprising a plurality of ladder parts able to slide relative to one another in order to deploy the said assembly heightwise,
   between the ladder assemblies, a collapsible base (60) comprising several base elements (41, 41', 141, 141') able to move relative to one another, the scaffolding system being arranged in such a way that whatever the state of the said system, the collapsible base remains fixed to the ladder assemblies and remains in the plane (yz) occupied by the folding base in the open state,
   a first slideway element (43) secured to a base element, and a second slideway element (62) collaborating with the first slideway element, the scaffolding system being arranged in such a way that when the scaffolding system passes from the closed state to the open state, the first slideway element passes from a first position relative to the second slideway element into a second position, and
   a locking device (300) arranged to trigger the immobilizing of the first slideway element when the said element reaches the second position,
   in which
   the second slideway element is secured to an upright of a ladder assembly,
   characterized in that
   of the said plurality of ladder parts, one ladder part comprises at least one upright defining a male slideway element and a female slideway element and collaborating with a single other upright by means of one out of the said male and female slideway elements, so as to deploy the said assembly heightwise, and
   the other of the said male and female slideway elements is used as a second slideway element.
2. Scaffolding system (1) according to Claim 1, in which the collapsible base comprises
   two first bar-type elements (41, 41'; 45, 45') mounted with the ability to pivot on the respective ladder assemblies (10, 11),
   two second bar-type elements (141, 141'; 38, 38') mounted with the ability to pivot in the respective ladder assemblies,
   and in which
   the first bar-type elements are mounted at (a) different upright height(s) from the upright height(s) at which the second bar-type elements are mounted,
   the first bar-type elements (41, 41'; 45, 45') are mounted articulated to one another via their opposite ends to the ends that are pivot-mounted on the respective ladder assemblies (10, 11), and
   the second bar-type elements (141, 141'; 38, 38') are mounted articulated to one another via their opposite ends to the ends that are pivot-mounted on the respective ladder assemblies.
3. Scaffolding system (1) according to Claim 2,
   in which each second bar-type element (141, 141') is mounted articulated on a corresponding first bar-type element (41, 41') so that the collapsible base (60) has the overall form of a pantograph,
   the scaffolding system comprising two first slideway elements, at the ends of two respective second bar-type elements, and collaborating with two first slideway elements secured to the two respective ladder assemblies.
4. Scaffolding system according to any one of Claims 1 to 3, in which the locking device comprises
   a pin (301) mounted on a spring, secured to one of either the first or second (62) slideway elements, and
   a locking plate (302) defining an orifice to accept the pin, this plate being secured to the other one of either the first (42) or second slideway elements.
5. Method for erecting a scaffolding system (1) comprising two ladder assemblies (10, 11) facing one another and intended to support a deck assembly (30) between the ladder assemblies, at least one ladder assembly comprising a plurality of ladder parts able to slide relative to one another in order to deploy the said assembly heightwise,
   a collapsible base (60) comprising several base elements (41, 41', 141, 141') able to move relative to one another, the collapsible base remaining fixed to the ladder assemblies, a first slideway element (43) secured to a base element and a second slideway element (62) secured to an upright of the ladder assembly and collaborating with the first slideway element,
   the method comprising
   moving the two ladder planes apart so as to be able to pass from a closed state, in which the two ladder assemblies are close together, into an open state, in which the two ladder assemblies are distant from one another, the scaffolding system being arranged in such a way that the collapsible base remains in the plane (yz) occupied by the collapsible base in the open state, and that the first slideway element passes from a first position relative to the second slideway element, into a second position, and comprising a locking device (300) designed to trigger the immobilizing of the first slideway element when the said element reaches the second position,
   characterized in that
   of the said plurality of ladder parts, one ladder part comprises at least one upright defining a male slideway element and a female slideway element and collaborates with a single other upright by means of one out of the said male and female slideway elements, so as to deploy the said assembly heightwise,
   the other of the said male and female slideway elements being used as a second slideway element.

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