EP3015640B1 - Equipment of rise with foldable platform and railings - Google Patents

Description

• un plan de montée dont les montants sont reliés par des échelons, marches ou barreaux,
• deux jambes d'appui, articulées près du sommet de chacun des deux montants par des articulations leur permettant d'occuper une position de rangement, dans laquelle elles sont contre les montants, et une position de stabilisation, dans laquelle elles sont écartées de ces montants, sur le coté et vers l'avant,
• des tirants contrôlant l'écartement des jambes, chaque tirant étant disposé entre la jambe et le montant sur lequel celle-ci est articulée,
• une plateforme articulée sur les montants du plan de montée avec possibilité de saillir vers l'avant ou d'être rabattue contre le plan de montée, et,
• un garde-corps disposé au sommet du plan de montée et pouvant occuper, sous l'action de bielles de commande, une position repliée contre les montants et une position active dans laquelle il est sensiblement parallèle à la plateforme déployée, et en saillie vers l'arrière.

The invention relates to climbing equipment comprising:

• a climbing plan whose amounts are connected by steps, steps or bars,
• two support legs, articulated near the top of each of the two uprights by articulations allowing them to occupy a storage position, in which they are against the uprights, and a stabilizing position, in which they are spaced from these amounts , on the side and towards the front,
• tie rods controlling the spacing of the legs, each tie being disposed between the leg and the amount on which it is articulated,
• a platform articulated on the uprights of the plan of climb with possibility to project forward or to be folded against the plan of rise, and,
• a guardrail disposed at the top of the climb plane and can occupy, under the action of control rods, a folded position against the uprights and an active position in which it is substantially parallel to the deployed platform, and projecting towards the 'back.

In the description that follows "the front" is what the user sees when he reaches the platform, so on the side of the support legs, while the "back" is what is on his back, on the side of the climb plan.

In the document EP2011957 in the name of the applicant, the railing is U-shaped whose branches are articulated on the uprights, while the connecting rods, which connect the railing to the platform, are mounted with the possibility of sliding on the branches of this railing.

With this freedom of movement of the railing, it can temporarily tilt upward to allow the user to come on the platform, slipping under the crossbar of the railing

The document EP2078819 , in the name of the applicant, describes equipment with platform and guardrail in which the means of spacing of the lateral legs are arranged to make their spacing automatic. Thus, each support leg comprises a spreader arm, arranged under the articulated platform and one end of which is articulated on a pivot of this platform, while the other end is articulated on a collar slidably mounted on the corresponding leg and on which is also articulated the pulling. With this arrangement, the two arms and pulling elements constitute two of the sides of a triangle whose deformation of the third side, formed between the pivot and the articulation of the tie rod on the upright, modifies the position of the sliding member on the leg and the angulation of the leg compared to the amount. This construction facilitates the deployment of the legs and ensures that in the deployed state the climbing equipment provides stability improving the safety of the personnel who borrows.

Finally, the document EP2738345 , in the name of the applicant, applies the foregoing provisions to a stool in addition to having in the folded state a reduced size in height to facilitate its transport, without impairing the automation of its deployment, its resistance and its stability in the deployed state.

This document describes a climbing equipment according to the preamble of claim 1.

In this application, each of the amounts of the climbing plane is composed of an upper part and a lower part, connected to each other by a multiposition joint, lockable in each position, while each of the legs of support is telescopic and composed of an articulated upper part on the upright and a lower part, slidably mounted around the upper one. In each support leg of this embodiment, the end of its lower portion carries a fitting on which are articulated, on the one hand, the end of the corresponding tie rod and, on the other hand, the end of the corresponding spacer arm , so that the legs extend automatically when the platform is brought into use position.

In addition, in this embodiment of the applicant, the U-shaped railing is articulated at the top of the uprights of the plane of rise and constitutes, by its parallel branches, slides for sliding collars articulated permanently to the upper end of control rods of his movements.

It should be noted that the structures that have been described briefly above are different from some platform ladders, which are encountered on the market, such as that described in the document DE10 2013 005 324 . Indeed, according to this document, the rear climb plan is linked, by joints, to a front support plane and lateral support legs, and its platform comes, in the use position, resting on a bar front support plan.

These climbing devices are the subject of user safety studies working at the top. These studies lead legislators and builders to change the rules and standards governing their construction and use. This is so for the structure of the railing which, not only must be able to occupy a storage position against the folded elements, but must also, when in the working position, ensure a restraint sufficient of the user. This is to retain the user when it is subjected to a reflex movement returning it against a cross bar of the railing with a force likely to unbalance it by causing it to deteriorate this bar and see even to rock out of the platform.

To counteract these exceptional efforts, it is necessary either to increase the thickness of the tubular elements, generally made of aluminum alloy, which increases the mass of the structure, or to organize these components so that the abnormally high forces have no effect on their strength. General.

Stepladders are encountered in the market in which the railing, forming a U in a plane parallel to the platform and arranged at mid-height, projects forward and is connected to this platform by lateral rods. The safety of the user is completed by an upper bar, connecting the top of the amounts of the climb plane, and vertical arms which, protruding at the rear of the uprights, are connected by detachable chains and are hinged to these amounts , to be folded against this plane in storage position.

The restraint of the user against a reflex movement away from the rearward climb plan is ensured only by the chains and the good grip of the vertical arms.

In another stool on the market, the guardrail and U-shaped with an upper crossbar articulated on the top of the uprights of the plane of rise and with branches, protruding rearward, and each carrying a transverse gate. Each gate is pivotally mounted on a vertical bar articulated on the branch of the railing and on a sub-smooth articulated on a post. Thus, the branch of the railing, the vertical bar and the sub-smooth form with a corresponding amount of section, a deformable parallelogram, connected by a rod to the platform.

When the user works on the platform with the two gates in the retaining position, that is to say arranged in the extension of one another, any reflex movement bringing it in support against these gates, generates a moment or tilting torque. The decomposition of this tilting torque on the uprights generates a downward vertical force, the value of which is greater the greater the length of the sub-smooth. In other words, the structure of the railing has a multiplier effect on the transmission to the amounts of the exceptional forces requiring the user.

Furthermore, when the railing is connected to the platform by connecting rods transmitting the tilting movements of the platform to the guardrail, a violent support, on the upper part of the railing in position of work, causes a straightening movement of the platform that can accentuate the imbalance of the user and can lead to its fall.

The invention aims to provide a climbing equipment with platform and railing foldable, which overcomes these disadvantages and improves the safety of the user without weighing down the equipment. This equipment uses the characteristics of the applicant's equipment, described above, but arranging and combining them differently.

According to the invention, each control rod of the railing is independent of the platform and its lower end is articulated against the inner face of the corresponding upright, each of the connecting rods (16) carrying the hinge bearings (31, 32) of a gate (33) extending transversely towards the gate of the other rod.

With this arrangement, the platform is independent of the railing and is insensitive to the efforts received by the latter and, in particular, the exceptional efforts resulting from excessive support of the user on the crossbar or the doors associated with the guard -body.

In addition, when the force is communicated to the gates, it is transmitted by connecting rods directly to the uprights, therefore without increasing its value, as is the case in stepladders with gates articulated on the connecting rods of a parallelogram . As a result, the profiles of the uprights do not need to be thickened to withstand the effort.

In one embodiment, each of the branches of the railing is provided, near its end, with a means, manually unlockable, ensuring the automatic locking of the sliding collar articulated to the connecting rod, when the collar reaches its position of job.

Thus when the railing is brought to its working position, its branches automatically lock with the connecting rods and form a rigid structure improving the safety of the user.

Advantageously, the amounts of the plane of rise are formed by tubular sections of rectangular section having, projecting from one of their large faces, a longitudinal fin which, extending a small face and facing outwards, is adapted to receive the support of the fin of an identical profile constituting the amount of a booster plane, this profile being pressed against that of the plan of climb by outer rollers protruding radially and rolling against the section of the plane of rise.

Such fins allow to carry over the perforations necessary for the establishment of sliding means and locking means of the booster and, therefore, they preserve the integrity of the profile and its mechanical strength.

• Figure 1 est une vue en perspective de coté de l'escabeau, lorsqu'il est en position d'utilisation;
• Figure 2 en est une vue en perspective par-dessous, lorsqu'il est en position d'utilisation ;
• Figure 3 est une vue partielle en perspective montrant, à échelle agrandie, l'articulation complexe sur la partie inférieure d'une jambe d'appui télescopique, et des moyens de guidage et de blocage d'une rehausse ;
• Figures 4 et 5 sont des vues partielles en perspective du collier coulissant sur lequel une bielle est articulée, respectivement, quand ce collier est en cours de déplacement sur une branche du garde-corps et quand il est en position verrouillée sur celui-ci ;
• Figure 6 est une vue partielle en perspective montrant, à échelle agrandie, une forme d'exécution des moyens de blocage du plan de rehausse sur le plan de montée, quand ces moyens sont déverrouillés ;
• Figure 7 est une vue partielle en perspective et en coupe de ces moyens de blocage, quand ils sont en position de blocage ;
• Figures 8 et 9 sont des vues partielles en perspective, en coupe transversale et à échelle agrandie, d'un montant du plan de montée et d'un montant du plan de rehausse, respectivement, dans la zone d'un patin de glissement et dans la zone d'un rouleau d'appui ;
• Figures 10 à 15 sont des vues en perspective illustrant la cinématique de redressement du garde-corps.

Other features and advantages will become apparent from the description which follows, with reference to the attached schematic drawing, showing an embodiment of the invention in the case of its application to a stepladder platform and guide body foldable.

• Figure 1 is a side perspective view of the stepladder, when in use position;
• Figure 2 is a perspective view from below, when in use position;
• Figure 3 is a partial perspective view showing, on an enlarged scale, the complex articulation on the lower part of a telescopic support leg, and means for guiding and locking a riser;
• Figures 4 and 5 are partial perspective views of the sliding collar on which a link is articulated, respectively, when the collar is being moved on a branch of the railing and when it is in the locked position thereon;
• Figure 6 is a partial perspective view showing, on an enlarged scale, an embodiment of the locking means of the raising plane on the plane of rise, when these means are unlocked;
• Figure 7 is a partial perspective view in section of these locking means, when they are in the locking position;
• Figures 8 and 9 are partial perspective views, in cross-section and on an enlarged scale, of an amount of the climb plane and an amount of the raising plane, respectively, in the zone of a sliding shoe and in the zone of a support roll;
• Figures 10 to 15 are perspective views illustrating the curvature kinematics of the railing.

Before describing in detail the means of the invention, it is firstly the description of the components already used by the applicant in her stools and included in it.

• un plan de montée M, composé de montants 2 et d'échelons, à savoir des marches 3 et d'un barreau cylindrique 3x,
• une plateforme rabattable 4, articulée sur le barreau transversal 3x, de manière que celle-ci puisse se déployer vers l'avant ;
• deux jambes télescopiques d'appui 6, articulées chacune au sommet de l'un des montants 2, par l'intermédiaire d'une articulation 7, multidirectionnelle ou à plusieurs degrés de liberté ;
• deux tirants rigides et latéraux 10, dont une extrémité est articulée en 12 sur le montant 2 correspondant, alors que l'autre extrémité est articulée en 9 sur un collier 8, coulissant sur la jambe 6 ;
• un garde-corps repliable 13, en forme de U dont les branches latérales 14 sont articulées par des axes 15, près de leur barre transversale avant 14a et aux sommets des montants 2 ;
• deux bielles 16 articulée en 18 sur un collier 19 monté coulissant sur la branche 14 correspondante ;
• et deux bras écarteurs 22 qui, disposés sous la plateforme 4, sont articulés par leurs extrémités postérieures sur un pivot 23, (visible figure 2), orthogonal à la plateforme et saillant de son fond, tandis que leurs extrémités antérieures sont liées par une articulation 24 à l'un des colliers 8 montés coulissants sur les jambes.

As shown in the various figures, this stool comprises:

• a rise plane M, composed of uprights 2 and steps, namely steps 3 and a 3x cylindrical bar,
• a folding platform 4 articulated on the crossbar 3x, so that it can be deployed forward;
• two telescopic support legs 6, each articulated to the top of one of the uprights 2, via a hinge 7, multidirectional or with several degrees of freedom;
• two rigid and lateral tie rods 10, one end of which is articulated at 12 on the corresponding upright 2, while the other end is articulated at 9 on a collar 8, sliding on the leg 6;
• a U-shaped foldable railing 13 whose lateral branches 14 are hinged by pins 15, near their front transverse bar 14a and at the vertices of the uprights 2;
• two connecting rods 16 articulated at 18 on a collar 19 slidably mounted on the corresponding branch 14;
• and two spreader arms 22 which, arranged under the platform 4, are articulated by their posterior ends on a pivot 23, (visible figure 2 ), orthogonal to the platform and protruding from its bottom, while their front ends are linked by a hinge 24 to one of the collars 8 mounted sliding on the legs.

The figures 1 and 3 show that the articulation 12 of the tie rods on the amounts is disposed above the bar 3x forming the articulation of the platform 4.

All the elements are tubular and made of aluminum alloy, with the exception of a cross 38 and a cross member 39 which are made in textile ribbons.

As shown in detail in figure 2 , each of the spreader arms 22 passes through an opening formed in a fitting 25 attached under the platform 4 and near each of its front angles. The edges of each opening cooperate with the corresponding arm 22 to guide it transversely with respect to the platform, so that its movements take place in a plane parallel to that of the platform, regardless of the position of this platform relative to the plane. climb that carries it.

It emerges from this description that, for each leg 6, the automatic spacing means comprise an arm 22 and a tie rod 10 which are articulated on the same sliding element 8, and form two of the sides of a deformable triangle, the third of which side is virtual and extends between the pivot 23 and the articulation 12 of the pulling on the amount 2.

According to the invention, each of the connecting rods 16 is articulated by its upper end and at 18 to the collar 19, sliding freely on one of the branches 14 of the railing, and, by its lower end, on a transverse axis 30 protruding from the inner face of the upright 2 disposed on the same side as the branch 14. Each connecting rod is independent of the platform 4 and carries two bearings 31 and 32, spaced apart and serving for the articulation of the two arms 33a and 33b of a door 33 in U shape.

The width of each gate 33 is equal to half the interval between the rods 16 and is less than the length of the arms 14 of the railing so that it can be folded below them without difficulty.

It should be noted that thanks to the independence between platform 4 and railing 13, when the stool is in the deployed position of use, shown figure 1 , Connecting rods 16 are substantially vertical and form an angle a with respect to the uprights 2, and are therefore inclined with respect to these amounts, which separates the pivot axis of the gates 33 of the uprights 2 and helps give them an opening angle of at least a quarter of a turn, without being disturbed by the structure of the guardrail.

At least one of the bearings, for example the upper one 31, is provided with means permitting the pivoting of the wicket bound to it only over a fraction of a turn, for example between 80 and 100 degrees, between a closed position, in which the gate 33 is in the extension of its neighbor, and an erasure position, in which it is turned forward and above the platform 4. At least this bearing 31 is provided with spring return means, not shown, able to bring it back to its closed position, after its pivoting by the user ascending the platform.

With this configuration, if following a burn or an electric shock, a reflex movement causes the user to lean very strongly against the two gates 33, the resulting forces on the rods 16 are transmitted directly to the uprights 2 by the joints 30, without being multiplied by the decomposition of a tilting torque, as is the case with gates articulated on one side of a deformable quadrilateral.

In one embodiment, each of the branches 14 of the railing 13 is provided, near its free end, with a means, manually unlockable, ensuring the automatic locking of the sliding collar 19 articulated to the rod 16, when the collar reaches its end. working position.

• sur chaque collier coulissant 19 une ouverture 35,
• et, sur l'extrémité libre de la branche 14, un doigt de blocage 36, à rappel élastique, apte à pénétrer dans l'ouverture 35 pour caler le collier 19 sur la branche 14 dans la position de déploiement maximale du garde-corps.

In the embodiment, shown on an enlarged scale at Figures 4 and 5 these blocking means comprise:

• on each sliding collar 19 an opening 35,
• and, on the free end of the branch 14, a locking finger 36, with elastic return, able to enter the opening 35 to wedge the collar 19 on the branch 14 in the maximum deployment position of the guardrail.

In the illustrated embodiment, and as shown figures 1 and 2 each of the telescopic support legs 6 is composed of an upper part 6a and a lower part 6b. The lower part 6b envelops the upper part 6a on which it slides, while the upper part 6a carries the sliding collar 8 on which are articulated the tie rod 10 and the spreader arm 22.

The lower part 6b of each leg 6 is provided with a longitudinal lumen 42 in which open 43 notches, positioning and support, adapted to cooperate with at least one finger 44 protruding radially from the inner portion 6a. The two leg portions 6a-6b of each telescopic leg 6 are connected by resilient means which tend to bring them back into the retracted position, as soon as the finger 44 has come out of the locking catch 43 which previously held it. This unlocking operation requires manual action on the leg 6b.

The upper elements of the two legs 6 are connected by the cross 38 with its cross member 39. The ends of the strands of the cross and the cross member 39 are riveted at 40 on these elements, to limit the spacing.

According to a complementary feature of the invention, shown to Figures 8 and 9 , the uprights 2 of the rise plane M consist of rectangular section profiles with two large faces 2a and two small faces 2b, these profiles comprising a longitudinal fin 50, disposed projecting from one of their large faces 2a and substantially in the extension of a small face 2b.

When assembling the components of the stepladder, the uprights 2 of the rise plane M are arranged so that their fins 50 are turned outwardly to be able to receive, later, the support of the fins 150 of a profile identical, constituting one of the amounts 102 of a booster plane R.

The Figures 8 and 9 show that the fins 150 of the booster R, are turned inwards and come against those 50 of the plane of rise M. To limit the friction and soften the sliding movements, the fins 50 of the profiles of the uprights 2 of the plane of rise M bear bearing pads 54, in good slip coefficient material, distributed with a regular pitch over the adjustment length of the riser R on the plane of rise.

The contact between the two rise planes M and the booster R is controlled by support rollers 151 mounted on pins 152 screwed into the uprights 102 of the booster.

In order to position and wedge the booster plane R on the rise plane M, each of the uprights 102 of the booster includes, as shown Figures 6 and 7 , a locking lever 55 articulated against its inner face and around a screw 56 passing through one of its ends. The free end of each lever 55 is connected to that of the lever disposed against the other profile upright 102 by a bar 57 for controlling the unlocking.

Each lever 55 is provided with return means in locked position, consisting for example of a torsion spring 58 disposed in the upright 102, as shown figure 7 . One of its branches 58a bears on the inside of the profile while the other branch 58b bears on a finger 59 passing through the wall of the upright 102.

The lever 55 also comprises a locking pin 60, passing through an opening of the fin 150 and adapted to engage in one of the notches formed in the fins 50 with a regular longitudinal spacing pitch, equal to the interval between steps 3 of the climb plan.

It is apparent from the foregoing that the use of finned sections 50, 150 makes it possible to transfer the guide means, the sliding means and the blocking means of the booster R to the latter without this generating machining operations. important walls 2a and 2b amounts of the climb plan, thus reducing the causes of weakening of these amounts.

When the step stool is in the folded transport and storage position, shown at figure 10 it forms a package having a reduced height, which can easily be stored vertically, or in a van, and moved by taxi between a parking place and a workplace, by means of the rollers 65 articulated at the lower ends of the uprights of the plane climb or booster plane.

• Redressement de l'escabeau, comme montré figure 10,
• Abaissement manuel de la plateforme 4, comme montré figure 11, ce qui amène les bras écarteurs 22 à repousser les jambes 6 vers l'avant et le coté, comme montré par les flèches 70 ;
• Si besoin est, réglage en hauteur et en horizontalité de la plateforme 4, en installant un rehausseur R et/ou en déployant les parties télescopiques 6b des jambes 6 ;
• Quand la plateforme 4 est sensiblement horizontale, comme dans la position montrée à la figure 12, déploiement du garde-corps 13 vers le haut, en faisant pivoter manuellement vers le haut, selon flèche 71, ses branches 14 autour des articulations 15 sur les montants 2, jusqu'à ce que les colliers coulissants 19 se déplaçant sur ces branches, selon flèche 72 de figure 14, viennent dans la position de figure 4 et se verrouillent par engagement des doigts à ressort 36 dans les ouvertures 36.
• En fin de déploiement, l'escabeau est dans la position des figures 1 et 15, position dans laquelle la plateforme 4 est sensiblement horizontale et indépendante du garde-corps 13, dont les portillons 33 sont dans l'alignement l'un de l'autre et les bielles 16 en appui direct sur les montants 2, par leurs articulations 30.

On the building site, the deployment from a folded storage position is done intuitively by successively performing the following phases:

• Straightening the stepladder, as shown figure 10 ,
• Manual lowering of platform 4, as shown figure 11 , which causes the spreader arms 22 to push the legs 6 forward and side, as shown by the arrows 70;
• If necessary, adjusting the height and horizontality of the platform 4, by installing a booster R and / or by deploying the telescopic parts 6b legs 6;
• When the platform 4 is substantially horizontal, as in the position shown in FIG. figure 12 spreading the guard rail 13 upwards, by manually pivoting upwards, according to arrow 71, its branches 14 around the articulations 15 on the uprights 2, until the sliding collars 19 move on these branches, according to arrow 72 of figure 14 , come in the position of figure 4 and lock by engaging the spring fingers 36 in the openings 36.
• At the end of the deployment, the stool is in the position of figures 1 and 15 , position in which the platform 4 is substantially horizontal and independent of the railing 13, whose gates 33 are in alignment with each other and the rods 16 in direct support on the uprights 2, by their joints 30 .

The user can then come on the platform by pushing the doors 33 forward, as shown figure 16 . These return to the closed position as soon as it is completely installed.

It follows from the foregoing that the separation of the movement of the guardrail relative to that of the platform, simplifies access to the platform 4 and allows better recovery of the exceptional forces exerted on the railing, reducing machining and various holes weakening the amounts, and, that, without having to increase the thicknesses of the profiles of these amounts.

This arrangement therefore improves the comfort and safety of the user.

Obviously, the folding is done by proceeding in a manner opposite to that just described.

Claims (8)

1. Climbing equipment with a foldable platform and a foldable guardrail, said equipment comprising:

   a main climbing section M having its uprights (2) interconnected by rungs (3);

   two stabilizer legs (6), hinged close to the tops of respective ones of the two uprights (2) by hinges (7) enabling them to take up a stowage position, in which they are placed against the uprights, and a stabilization position, in which they are spaced apart from said uprights, forwards and sideways,

   ties (10) controlling the spacing-apart of the legs (6), each tie being disposed between the leg (6) and the upright (2) to which said leg is hinged;

   a platform (4) hinged relative to the main climbing section with the possibility of projecting forwards or of being folded away against said main climbing section; and

   a U-shaped guardrail (13) disposed at the top of the main climbing section M and suitable, with the assistance of control rods (16), for taking up a folded-away position in which it is folded away against the uprights (2) and an active position in which it is substantially parallel to the deployed platform and projecting backwards, said guardrail being hinged, close to its transverse bar (14a), to the tops of the uprights (2) of the main climbing section, and constituting, via its parallel branches (14), runners for sliding collars (19) hinged permanently to the top ends of the control rods (16);

   characterized in that each control rod (16) is independent of the platform (4) and its bottom end is hinged (at 30) against the inside face of the corresponding upright (2), each of the rods (16) carrying the hinge bearings (31, 32) for a gate (33) extending transversely towards the gate of the other rod.
2. Climbing equipment with a foldable platform and a foldable guardrail according to claim 1, characterized in that each of the branches (14) of the guardrail (13) is equipped, close to its end, with manually unlockable means (36) for automatically locking the sliding collar (19) hinged to the corresponding rod (16), when the collar reaches its work position.
3. Climbing equipment with a foldable platform and a foldable guardrail according to claim 1, characterized in that at least one of the two hinge bearings (31, 32) for hinging a gate to its vertical rod (16) is equipped with means allowing it to be pivoted through a fraction of a turn only, between its closed position and a retracted position above the platform (4), and resilient return means for urging it back into its closed position.
4. Climbing equipment with a foldable platform and a foldable guardrail according to claim 1, characterized in that each stabilizer leg (6) is telescopic and is made up of an upper portion (6a) and of a lower position (6b) that are mounted to slide on the outside of the upper portion (6a), said lower portion being equipped with a longitudinal slot (42) provide with positioning and bearing recesses (43) suitable for co-operating with at least one finger (44) that projects radially from the upper portion.
5. Climbing equipment with a foldable platform and a foldable guardrail according to claims 1 and 4 taken together, characterized in that the lower portion (6b) of the stabilizer leg surrounds the upper portion (6a) on which it slides, while the upper portion (6a) carries the sliding collar (8) to which the tie (10) and the spacer arm (22) are hinged.
6. Climbing equipment with a foldable platform and a foldable guardrail according to claim 1, characterized in that the uprights (2) of the main climbing section M are constituted by shaped-section members of rectangular cross-section, each of which has, projecting from one of its large faces (2a), a longitudinal fin (50) that, extending a small face (2b) and facing outwards, is suitable for bearably receiving the fin (150) of an identical shaped-section member constituting the upright (102) of a booster climbing section R, which upright (102) is pressed against the upright (2) of the main climbing section by outside bearing rollers (151) projecting radially and rolling against the shaped-section member (2) of the main climbing section.
7. Climbing equipment with a foldable platform and a foldable guardrail according to claim 6, characterized in that the fins (50) of the shaped-section members (2) of the uprights of the main climbing section carry bearing shoes (54) made of a material having a good coefficient of sliding friction and distributed over the adjustment length along which the booster section R can be adjusted on the main climbing section M.
8. Climbing equipment with a foldable platform and a foldable guardrail according to claim 6, characterized in that each of the uprights (102) of the booster section R has, hinged against its inside face, a locking lever (55) provided with return means for urging it back into the locked position, and a locking finger (60) passing through an opening in the fin (150) of the upright and suitable for engaging in one of the notches (160) provided in the fin (50) of the main climbing section.

Images