FR3046619A1 - SCAFFOLD COMPRISING TWO SCALE ASSEMBLIES IN SEVERAL SLIDING PARTS ONE TO THE OTHER. - Google Patents

Abstract

A scaffolding system (1) having two ladder assemblies (10, 11) facing each other, each ladder assembly having a plurality of ladder portions (100, 101, 102, 110 , 111, 112), with uprights and rungs sliding relative to each other, in which the ladder section uprights each define a profile with a side from which ladder portion steps extend. , said flank (64), and, on either side of said flank, two other sides, said fields (63); at least one amount defines on one of its fields a male slide element (65), and at least one amount of at least one other scale portion of the same scale assembly is profiled in the longitudinal direction so as to define on one of its fields, facing the field defining the male slide element, a female slide member (62) cooperating with the male slide member so that the ladder portions corresponding to these slide members can slide one with respect to the other.

Description

The invention relates to a scaffolding system comprising two sets of ladders facing each other, a set of plates resting on these sets. scale, and wherein the scale assemblies each comprise several ladder portions sliding relative to each other.

The Applicant sells under the names SK4 and SK6 scaffolding adjustable in height, thus sliding ladder parts relative to others. Each ladder portion includes two profiled studs and rungs between these studs. The ladder portions intended to remain on the floor have a greater width than the ladder portions intended to slide upwards.

There is a need for a system allowing simplified logistics.

There is provided a scaffolding system having two ladder assemblies facing each other, for supporting a deck assembly, each ladder assembly having a plurality of ladder portions, each portion of ladder comprising two uprights extending in a longitudinal direction and at least two steps between these uprights, sliding relative to each other in the longitudinal direction to move from a retracted state to a deployed state. The amounts each define, in a plane normal to the longitudinal direction, a profile with: - a side from which extend the rungs, said sidewall, and - on either side of the sidewall, two other sides, said fields.

At least one amount of at least one scale portion defines on one of its fields a male slide element, and at least one amount of at least one other scale portion of the same scale assembly is profiled according to 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.

Thus, because of this field-field cooperation, two ladder parts cooperating together can have the same width, thus making it possible to provide a single step size for these two parts of scale.

Fields of the same amount can advantageously define parallel planes between them, even if the invention can quite operate with non-parallel fields between them.

Advantageously and in a nonlimiting manner, the sidewall of an amount can define a plane normal to the plans of the fields of this amount.

Thus, the amounts can have a roughly rectangular shape profile, with for example the fields of smaller dimension than the flank.

A part of scale may comprise only two steps, in which case we may speak of spacer elements between the uprights, or more.

Advantageously, the scaffolding system may further include a locking device arranged to prevent a return to the retracted state. The locking device may be arranged to, when actuated, prevent movements tending to bring the ladder parts back to the retracted position, typically downward when the scaffold is placed on a flat, horizontal floor.

The locking device may for example comprise one or more pivoting hooks, pivotally mounted on a portion of the ladder, and adapted to be folded down so as to engage a step of this ladder portion and on a rung of the adjacent ladder portion, and adapted to be retracted to allow sliding between these ladder portions.

Advantageously and in a nonlimiting manner, the locking device can be arranged to further prevent movements tending to deploy the ladder parts. The locking device can thus block one part of scale relative to the other, to ensure maintenance in the deployed state.

For example, the locking device may comprise, in addition to or not pivoting hooks engaging by gravity on the corresponding step or steps, additional means to prevent the most elevated ladder portion is raised more, for example a pin adapted to be inserted into holes of two respective uprights when these orifices are facing one another. The male slide member may be punctual, short pad type or slider, but advantageously, it will prefer a profiled slide member, extending over the entire height of the upright. The female slide element may for example be a groove with flange (s), L or T for example, or even a dovetail. The male slide element may have a shape profile complementary to that of the female slide element, for example L, T, dovetail, or other.

Advantageously, for at least one scale assembly, and advantageously both, each of the uprights of this scale assembly defines a male slide element on one of its fields and is shaped so as to define on the other of its fields. a female slide element. Thus, it can be expected to use the same model amount from one part of scale to another. Since the ladder portions have identical widths, it will be possible to provide a single scale part model for the entire scaffolding system.

In an advantageous embodiment, for at least one, and preferably each, portion of scale, the two uprights of this ladder portion comprise two flanks on either side of the fields, and able to receive the ends of the ladders. levels. These two amounts can thus be identical to each other.

Thus, it can be expected to use a single model of amount for the scaffolding system.

In an advantageous embodiment, the flanks define a recess for receiving steps. The invention is not limited to a means of securing particular steps, but it may for example provide a fixing by welding, or else by crimping.

Advantageously, at least one, and preferably each, upright is a metal section. The scaffolding system can thus be of relatively simple design, and this while remaining relatively reliable during its lifetime.

In an advantageous embodiment, the scaffolding system may be arranged such that in the expanded state the highest ladder portions are the two ladder portions of the two most distant ladder assemblies. one from the other. Thus, a user descending from the tray assembly through the interior of the scaffold will relatively easily place his foot on a rung, and this user may have sensations similar to those he would have if he descended a staircase. The scaffolding system can thus be more secure than if the base of the scaffolding had larger dimensions than the upper floors.

The number of scale parts per scale set can be two, three or more.

Advantageously and non-limitatively, at least a portion of at least one amount can receive a surface treatment. This can facilitate sliding movements and limit the risk of seizure.

It is possible to perform this surface treatment on the entire amount, but advantageously, the treatment can be located, and limited to the slide elements, or even to the fields, in order to limit costs.

It can be expected that all the amounts of the system receive this surface treatment, but advantageously, we can abstain from providing this treatment to the amounts intended to cooperate with the amounts having received this surface treatment. Thus, in the case of a scale plan in three parts of scale, it will be possible to perform the surface treatment only for the amounts of the part of intermediate scale, which slides on the one hand with respect to the lowest scale part and the other part with respect to the highest scale part.

Thus, advantageously, one of the male slide member and the female slide member has received a surface treatment, and the other of the male slide member and the female slide member is devoid of that surface treatment.

Advantageously and without limitation, the system may further comprise a folding base pre-mounted between these sets of scale. The scaffolding system can thus move from a closed state, in which the two sets of ladders are brought closer to one another, to an open state, in which the two sets of ladders are kept apart. one from the other by the folding base.

The scaffolding system can thus be particularly compact.

Advantageously and in a nonlimiting manner, the scaffolding can be arranged so that whatever the state of the scaffolding system, the folding base remains fixed to the ladder sets and remains in the plane occupied by the folding base at the open state.

Advantageously and without limitation, the scaffolding system may comprise a locking device arranged to trigger a blocking of the basic elements when the open state is reached.

The scaffolding system may advantageously comprise a first slide member integral with a member of the folding base, and a second slide member, cooperating with the first slide member, and be arranged so that when the scaffolding system transition from the folded state to the open state, the first slider element moves from a first position relative to the second slider element to a second position. The locking device can be arranged to trigger a blockage of the first slide element when said element reaches the second position.

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 guardrail amount is driven in motion relative to the ladder amount, said movement continuing at least until the height difference between the ladder assemblies reaches the lock pitch, to compensate for this difference in height. The invention is in no way limited by this arrangement of integrating games to the baes 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 having two ladder assemblies facing each other, for supporting a tray assembly, each ladder assembly including a plurality of portions of scale, each ladder portion comprising two uprights extending in the longitudinal direction and at least two ladders between said uprights, the uprights each defining, in a plane normal to the longitudinal direction, a profile with a side from which extend the rungs, said flank, and, on both sides of said flank, two other sides, said fields, at least one amount of at least one part of scale defining on one of its fields a slide element male, and at least one amount of at least one other scale portion of the same scale assembly being profiled in the longitudinal direction so as to define on one of its fields, opposite the field defining the male slide member, a female slide member, and the scaffolding system being arranged for the male slide member to cooperate with the female slide member, comprising raising the ladder portion corresponding to the one of said male slide member and said female slide member, to slide in said longitudinal direction said scale plane with respect to the scale plane corresponding to the other one of said male slide member and said member female slide, to move the scaffolding system from a retracted state to an expanded state. The user can then block the system in the deployed state by actuating a locking means, for example a pivot hook adapted to engage two steps of two respective scale portions. The invention will be better described with reference to the figures, which relate to embodiments given by way of example and not limiting.

Figure 1 shows an example of scaffolding according to a first embodiment of the invention.

Figure 2 shows a part of the scaffolding shown in Figure 1, in the closed state.

Figure 3 shows part of the scaffolding shown in Figure 1, in the open state.

FIG. 4 shows part of an example of scaffolding according to a second embodiment of the invention, in the closed state.

Figure 5 shows the part of the scaffolding shown in Figure 4, in the open state.

FIG. 6 is a perspective view of a detail of the scaffolding shown in FIGS. 2 and 3;

Figure 7 shows an example of scaffolding similar to that of Figure 1, during assembly.

Figure 8 is a side view of three uprights of three respective scale portions of the scaffold of Figure 1.

FIG. 9 shows an example of an assembly element between a guardrail and a ladder section of the scaffold of FIG. 1.

Figure 10 shows a portion of the scaffolding example of Figure 1, being assembled.

FIG. 11 shows the scaffolding of FIG. 7, in the compact and frontal state,

Figure 12 shows the scaffold of Figure 7 in the compact state, seen in profile.

Figure 13 is a perspective view of an upper part of the scaffolding system of Figure 1.

FIG. 14 is a perspective view of an example of a folding base for a scaffolding system according to an embodiment similar to that of FIGS. 4 and 5.

Figure 15 shows the connecting member of 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.

Referring to Figure 1, which refers to a first embodiment, a scaffolding system 1 comprises a tray assembly support, comprising two sets of scales 10, 11, facing one of the other, and kept at a distance from each other by means of an articulated spar 160 and a folding base 60.

In this first embodiment, the folding base 60 defines a pantograph, and comprises bar-type elements, here rods 41, 4Γ, 141, 14 Γ, hinged, secured to the uprights 120, 130 of the scale 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 to be interpreted 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 in Figure 1, defined in the floor of the tray.

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

Figures 11 and 12 show a scaffolding close to the scaffolding system shown in 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 scaffold of FIG. 1 is devoid of elements that can be lost, with the exception of the set of trays 30 which is detachable. The one-piece scaffold 1 of FIGS. 11 and 12 is thus, in the folded state, in the form of a cube in the form of a pad of dimension 0.98 × 0.92 × 1.38 meters for example and provided with four swiveling and height adjustable wheels 50.

To mount this scaffolding, start from the closed and folded state corresponding to the representation of FIGS. 11 and 12 by moving the ladder assemblies 10, 11 away from each other along the direction of the length (direction z on the reference of Figure 1), thus moving from the closed state to the open state.

Figures 2 and 3 on which the scaffolding system is only partially shown, to better visualize this first stage of 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, 4Γ, 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 step 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 pivot about 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 in FIG. 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 FIG. 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-shaped element 142 , in one piece with the movable hinge member 43. The movable hinge member 43 can be obtained by providing a profile defining the T-element 142 and two surfaces 242 facing one of the other, then 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.

Returning to FIG. 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 translatable upward in the y direction when the ladder portions 100, 110 are spaced from each other.

With reference to FIG. 6, it is also possible to provide a locking device 300 that is automatically installed at the end of the 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 in Figure 6) sized to receive the pin 301. The plate 302 is fixed on the element of When this element 43 reaches a limit position, the non-visible orifice is opposite the pin 301. Because of 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 has 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 drive the pin 301 out of the hole. The operator will have to drive the shaft 141 in motion while holding 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 shown in FIG.

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. 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 part of scale 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 precisely, as illustrated in FIGS. 7, 10 and 13, the rail 22 and the sub-rail 24 each define a hinge 26 making it possible to fold a railing portion 201 of the subassembly 221 comprising this rail 22 and this sub-rail. Smooth 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 guardrail portions 201, 202 are thus 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 scale assembly 10, 11 by an x-joint at the member 28, allowing the rigid railing frames and the sets of smooth rolled over these railing frames to pivot about axes (D1), (D2), respectively, passing 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 plate (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 in 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 guard rails 270, 271, 272, 273 extend in the extension of the uprights 122, 132 as illustrated in FIG. 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 sections shown in FIG. 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 in FIG. 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 can slide relative to the amount 120 and the amount 122 can slide from 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.

Furthermore, as seen in FIG. 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 can be identical. between them. 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 shown in FIG. 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 FIGS. 9 and 15, the connecting element 28 comprises a part 435 intended to be fastened 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 in 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 upright 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 FIG. 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 may 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 tray-type access gate on railings.

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

Each diagonal includes a large diameter tube 171 in which 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 preassembled on a highest scale portion 102 or 112. folded state, the small diameter tubes and large diameter are separated from each other, each tube remaining simply secured to the corresponding scale portion.

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 part of scale can be interesting 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 need not 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.

FIGS. 4 and 5 illustrate an alternative embodiment in which the folding base of pantograph type 60 (or accordion) has been replaced by a folding base 60 'with a spacer element, here a vertical rod 39. FIG. 14 is relative to an embodiment similar to that of Figures 4 and 5 and will be commented simultaneously. In 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 in FIG. 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 illustrated in 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 be noted that the (or in the embodiment of Figure 7) folding base (s) 60 remains (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 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 (9)

claims Scaffolding system (1) having two ladder assemblies (10, 11) facing one another to support a tray assembly (30), each ladder assembly including a plurality of ladder portions (100, 101, 102, 110, 111, 112), each ladder portion comprising two posts (130, 131, 132, 120, 121, 122) extending in a longitudinal direction (z) and at least two rungs (3) between these posts, sliding relative to one another in the longitudinal direction to move from a retracted state to an expanded state, wherein the posts each define in a plane (xz) normal to the direction longitudinal, a profile with a side from which extend the ladder, said flank (64), and, on either side of said flank, two other sides, said fields (63); at least one amount of at least one scale portion defines on one of its fields a male slide member (65), and at least one amount of at least one other scale portion of the same scale set is profile in the longitudinal direction so as to define on one of its fields, opposite the field defining the male slide element, a female slide member (62); 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. 2. scaffolding system (1) according to claim 1, wherein for at least one scale assembly (10, 11), each of the amounts (130, 131, 132, 120, 121, 122) of this set of Scale defines a male slide member (65) on one of its fields and is shaped so as to define on the other of its fields a female slide member (62). Scaffolding system according to any one of claims 1 to 2, wherein the male slide element (65) extends longitudinally over the entire height of the corresponding upright. The scaffolding system of claim 3, wherein the male slider member (65) has a T-profile. The scaffolding system according to any one of claims 1 to 4, wherein each post (130, 131, 132, 120, 121, 122) is a metal section. The scaffolding system according to any one of claims 1 to 5, further comprising a locking device (150) for blocking one part of the ladder with respect to the other, in order to maintain deployed state. The scaffolding system according to any one of claims 1 to 6, said system being arranged such that in the deployed state, the highest ladder portions (102, 112) are the two parts of the scaffolding system. scale of the two respective scale sets furthest apart from each other. The scaffolding system according to any of claims 1 to 7, wherein one of the male slide member and the female slide member has received a surface treatment, the other of the element male slide and the female slide member being devoid of said surface treatment. 9. A method of mounting a scaffolding system having two scale assemblies (10, 11) facing each other for supporting a tray assembly (30), each scale assembly comprising a plurality of ladder portions (100, 101, 102, 110, 111, 112), each ladder portion including two posts (130, 131, 132, 120, 121, 122) extending in the longitudinal direction and at least two steps (3) between said uprights, the uprights each defining, in a plane (xz) normal to the longitudinal direction, a profile with a side from which the rungs extend, said sidewall (64), and on either side of said flank, two other sides, said fields (63), at least one amount of at least one scale portion defining on one of its fields a male slide element (65), and at least an amount of at least one other part of the scale of the same scale assembly being profiled following the direct longitudinal ion so as to define on one of its fields, opposite the field defining the male slide element, a female slide element (62), and the scaffolding system being arranged so that the male slide element cooperates with the female slide member, comprising raising the ladder portion corresponding to one of said male slide member and said female slide member, to slide in said longitudinal direction said scale plane with respect to the ladder plane corresponding to the other one of this male slide member and said female slide member, to move the scaffolding system from a retracted state to an expanded state.