EP2806097B1 - Stepladder with retractable wheels, a front wheel of which being tiltably mounted and hand-operated - Google Patents

Stepladder with retractable wheels, a front wheel of which being tiltably mounted and hand-operated Download PDF

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Publication number
EP2806097B1
EP2806097B1 EP14168496.9A EP14168496A EP2806097B1 EP 2806097 B1 EP2806097 B1 EP 2806097B1 EP 14168496 A EP14168496 A EP 14168496A EP 2806097 B1 EP2806097 B1 EP 2806097B1
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EP
European Patent Office
Prior art keywords
plane
uprights
lever
wheel
upright
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EP14168496.9A
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German (de)
French (fr)
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EP2806097A1 (en
Inventor
Patrick Lachant
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CDH Group SAS
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CDH Group SAS
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    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/397—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders characterised by having wheels, rollers, or runners
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/39—Ladders having platforms; Ladders changeable into platforms
    • E06C1/393—Ladders having platforms foldable with the ladder

Definitions

  • the invention relates to running boards, including the individual rolling platform type (PIR) as defined by French standards NF P 93-352 and NF P 93-353.
  • PIR rolling platform type
  • a step conventionally comprises a front plane having two front uprights and at least one step connecting the front uprights, and a rear plane having two rear uprights and at least one bar connecting the rear uprights, hinged mounted relative to the front plane.
  • the footboards of the PIR type further include a floor mounted between the front plane and the rear plane to allow an operator to work at height without fatigue, his two feet resting flat on the floor, and wheels facilitating the movement of the footboard .
  • the steps of this type are folding, the rear plane tilting on the front plane to allow easy storage and relatively compact footboard.
  • the step is equipped with wheels. More specifically, on a large number of models, the rear plane is provided with wheels fixed to the rear uprights, and which, when the step is unfolded and rests on the ground in the abnormal working position, are raised above the ground. When the user wishes to move the step, he grasps it by the front upright, tilts it back until the wheels touch the ground, allowing it to be maneuvered and rolled.
  • the US patent US 6,026,931 proposes a structure according to the preamble of claim 1 wherein the rear portion of the step is provided with rear wheels mounted on spring, while the front portion of the step is provided with a pair of front wheels mounted on an axis. pivoting, the tilting of the front wheels to a position of displacement being controlled by the foot by actuating a pedal, associated with the descent of the user of the step: The reverse tilting of the front wheels to a retracted position is caused by the imposition a weight (in practice, the weight of the user) on the running board.
  • a weight in practice, the weight of the user
  • the sole weight of the leg on the first step is not sufficient to cause the tilting of the front wheels to their retracted position. The user is therefore exposed to the risk of falling if he does not impose, at the first step, a sufficient weight to the running board.
  • a first objective is to propose a rolling step that can be moved without difficulty by the user.
  • a second objective is to propose a rolling step which presents a better ergonomics for the user.
  • a third objective is to provide a rolling step providing enhanced safety for the user.
  • the manual operation of the lever causes the deployment of the front wheel, which allows to temporarily place the step in a rolling configuration for easy movement.
  • the front wheel regains its retracted position by gravity, the step then resting on the ground at least by its front uprights, which allows the user to climb on it without risk of evasion.
  • step 1 On the figure 1 is represented a step 1 intended to allow work at height.
  • the step 1 is of the individual rolling platform type.
  • the step 1 comprises a front plane 2 having a pair of uprights 3 front and at least one step 4 transversely connecting the uprights 3 before.
  • the step 1 comprises a single step 4 .
  • several steps could be provided.
  • the amounts 3 are in this case formed of metal profiles (for example aluminum or aluminum alloy), in particular rectangular section. At lower ends 5, the uprights 3 are provided with pads 6 slip.
  • the step 4 is formed of a folded cut sheet.
  • the step 4 has a nose 7 of step formed by a fold which extends projecting from the front plane 2 , extended downwards by a lower edge 8 by which the step 4 is fixed on the uprights 3, in particular by riveting.
  • the step 1 further comprises a rear plane 9 hinged to the front plane 2 and having a pair of rear uprights 10 and at least one bar 11 connecting the rear uprights 10 .
  • the rear uprights 10 are, like before uprights 3, formed of metal profiles (e.g. aluminum or aluminum alloy), in particular with a rectangular section. At lower ends 12, the rear uprights 10 are provided with pads 6 slip.
  • the step 1 is unfolded (configuration illustrated in the figures)
  • the plane 9 back forms an angle with the plane 2 before, and 12 lower ends of the posts back 10 form, with the 5 lower ends of the uprights 3 before a plan P laying (dashed) for the step 1, corresponding to a floor S ideally plan on which rest the step 1.
  • the rear plane 9 comprises three bars 11. These bars 11 are in this case square section, but this section could be circular or oval. Depending on the height of the step 1, the number of bars 11 could be different (especially higher). Fixing the bars 11 rear uprights 10 is here made by bouterollage.
  • the rear plane is mounted articulated with respect to the plane of the two front ends 13 of the upper rear uprights 10, which are shorter than the uprights 3 before.
  • the pivot axis of the rear plane is formed by screws 14 secured to fixed plates 15 (in this case by bolting) on external lateral faces of the uprights 3 before, as shown in the figures.
  • the step 1 further comprises a floor 16 which extends astride between the front plane 2 and the rear plane 9 in unfolded configuration of the step 1.
  • This floor 16 is hingedly mounted relative to the front plane 2 via of a cylindrical lintel 17 fitted on a bar 18 connecting the uprights 3 before.
  • the floor 16 is also articulated relative to the rear plane 9 by means of connecting rods 19, the floor 16 resting in the deployed configuration, a rod 11 connecting the struts 10 back.
  • the floor 16 may be provided with a baseboard 20 covering three sides of the floor 16, with the exception of a front edge to facilitate the access of the user to the floor 16 by plane 2 before.
  • This baseboard 20 forms a stop for the feet of the user and thus prevents it from tripping, limiting the risk of falling.
  • the step 1 is also equipped with a shelf 21 tool holder (or package carrier), which extends transversely between the uprights 3 before, at an upper end of these.
  • the shelf 21 is fixed to the front uprights 3 by means of fittings 22 overlapping a top bar 11 connecting the rear uprights 10 .
  • the step 1 is also equipped with a railing 23, mounted on the front plane 2 in line with the floor 16 in unfolded configuration of the step 1, and intended to retain the user in case of imbalance, so as to minimize the risk of falling.
  • This railing 23 is collapsible. It comprises a pair of side rails, namely a barrier 24 left and 25 right barrier, each pivotally mounted on a front upright 3 between an extended position (shown in the figures) in which each fence 24, 25 extends substantially perpendicularly in front plane 2 , and a folded position in which each barrier 24, 25 extends against the front plane 2 .
  • Each barrier 24, 25 has a U-shaped profile and is preferably formed of a metal tube (for example aluminum or aluminum alloy) folded.
  • Each barrier 24, 25 has an upper section or ramp 26, intended to extend at the height of the trunk of the user (between the belt and the bust), an intermediate section or main 27 current (visible, for the barrier 25 right , by dashed transparency on the figures 1 and 4 ), vertical in the deployed position of the barrier 24, 25 and in unfolded configuration of the step 1, and a lower section 28 .
  • Each barrier 24, 25 is hinged relative to the upright 3 before by its ramp 26 and its lower section 28 , both mounted on coaxial pivots 29 (formed in this case by screws) secured to clevises 30 in which are housed in the deployed position, the respective ends of the ramp 26 and the lower section 28 , as illustrated in FIG.
  • the railing 23 further comprises a movable gate 32 for retaining the unbalanced user forward of the step, while delimiting the work area so that a single user can move with ease on the floor 16 .
  • the gate 32 will be described in more detail below.
  • the step 1 is provided with retractable wheels.
  • the step 1 is equipped with a pair of retractable rear wheels 33 movably mounted relative to the rear plane 9 between a retracted position in which the rear wheels 33 extend above the laying plane P , and a position deployed in which the rear wheels 33 extend at least partially below the laying plane P.
  • Each rear wheel 33 is permanently biased towards its deployed position by a spring 34 (in this case a compression spring).
  • each rear wheel 33 is mounted on a rear upright 9 by means of a U-shaped mounting plate 35 , comprising a core 36 through which the plate 35 is fixed (in species by screwing) to the amount 10, and two arms 37 projecting transverse.
  • the wheel 33 is mounted at the lower end of a support shaft 38 , slidably fitted to the ends of the arms 37 with the interposition of the spring 34, as illustrated in the inset on the figure 1 , and on the figure 7 .
  • a cover can be fitted on the plate 35 to cover the spring and thus prevent dust and debris from the construction site come to hinder the proper functioning of the spring 34.
  • On the figure 1 only one cache is visible (on the right), the left cache having been omitted (as on the figure 7 ) to reveal the spring 34 and the plate 35.
  • the rear wheels 33 are retracted and the step 1 rests on the ground S, at the rear plane 9 , by its pads 6.
  • the rear wheels 33 are deployed and the step 1 rests, at the rear plane 9 , on the ground S by its rear wheels 33 , the laying plane P being raised relative to the ground S .
  • rear wheels 33 are shown in a position in which they extend substantially parallel to the rear plane 9, they are however mounted freely pivotable both around their central axis of rolling and around their shaft 38 support.
  • the step 1 further comprises a train 39 rolling forward, equipped with a wheel 40 before retractable (as shown on the figure 1 ), or two or more wheels, as shown in the variant of the figure 3 .
  • the forward rolling gear 39 is movably mounted relative to the front plane 2 between a retracted position in which the front wheel 40 extends above the laying plane P (FIG. figure 4 ), and an extended position in which the front wheel 40 protrudes from the laying plane P ( figure 6 ).
  • the undercarriage 39 comprises a cross member 41 preferably having a profile substantially U pivotally mounted between the uprights 3 back in the vicinity of their lower ends 5.
  • the cross-member 41 comprises a central section 42 , which extends transversely, and at the opposite ends of the central section 42 , two angled returns 43 through which the cross-member 41 is rotatably mounted on the uprights 3 before, for example by bolting (but this pivoting attachment could be made by screwing or riveting).
  • the step 1 comprises a single front wheel 40 (in the example of the figure 1 )
  • this wheel 40 is preferably mounted in the center of the central section 42 .
  • the wheel 40 could be slightly offset laterally, provided that it does not result in an unbalance of the step 1.
  • the step 1 comprises a pair of wheels 40 before (in the example of the figure 3 ) these wheels 40 are preferably mounted on the central section 42 in the vicinity of the returns 43, so as to maximize the stability of the step 1, but the wheels 43 could be deported to the center of the central section 42 .
  • the or each front wheel 40 is mounted on the cross member 41 by means of a shaft 44 bolted to a bracket 45 secured to the cross member 41.
  • the or each wheel 40 before is freely pivoting around of its driving axis that around its shaft 44 support.
  • the step 1 further comprises a mechanism 46 for actuating the wheel 40 before to control deployment (in advance of the displacement of the step 1) or conversely allow it to retract.
  • This actuating mechanism 46 comprises at least one lever 47 maneuvering articulated on a post 3 before, and a rod 48 coupling the lever 47 to the train 39 rolling forward.
  • the lever 47 is in the form of a U-shaped section (metal or plastic) mounted on the upright 3.
  • the lever 47 is secured, for example, by means of a bolt 49 which forms the pivoting axis of the lever 47.
  • the lever 47 has a front wall 50 , on which is pressed the user to tilt the lever 47 about its axis, and two side walls, namely an outer wall 51 and a wall 52 internal side, which frame the amount 3 and by which the lever 47 is fixed on the amount 3 .
  • one of the side walls (in this case the inner wall 52 ) has an end portion 53 which protrudes from the upright 3 opposite the front wall 50 towards the inside of the step 1.
  • this portion 53 end is made a piercing 54 in which is introduced a folded upper end 55 of the bead wire 48 (which is in this case in the form of a metal rod with small diameter circular section) to achieve the pivot connection between the rod 48 and the lever 47 for maneuvering.
  • one of the returns 43 at right angles to the cross member 41 is pierced with a hole 56 into which is introduced a folded lower end 57 of the bead wire 48 to provide the pivot connection between the bead wire 48 and the cross member 41.
  • the rod 48 runs along the upright 3 before, the bore 54 in the lever 47 and the hole 56 in the crossbar 41 being situated in the vicinity of a rear face of the upright 3.
  • the step 1 is equipped with a guide 58 fixed on the upright 3 substantially midway between the lever 47 and the train 39 rolling forward, and wherein the rod 48 is slidably mounted. This guidance allows to use for the realization of the rod 48 a small diameter rod, which will have the advantage of lightness and visual discretion.
  • the rod 48 along the amount 3 before, it does not present any gene or any risk for the user.
  • the aesthetics of step 1 are also preserved.
  • the front wheel 40 In unfolded configuration of the step 1, whether it supports a load or not, the front wheel 40 extends above the laying plane P. In practice, the wheel 40 before rests by gravity on the ground S, confused in this situation with the laying plane P.
  • the angular travel of the operating lever 47 is not necessarily important. In fact, in the illustrated example, this angular stroke is small, of the order of (or less than) about 15 °. It is sufficient that the extended position of the wheel 40 (or wheels) before causes a slight elevation of the uprights 3 before to allow the running of the step 1.
  • a second lever is provided on the other post 3 before, to ensure control of the tilting gear 39 rolling front two hands.
  • a crossbar can connect the levers to synchronize their tilting, in the manner of a panic bar fire door.
  • the gate 32 is movable between an open position (dashed on the figure 2 ) and a closed position (in solid line on the figure 2 ).
  • the gate 32 comprises a high rail 59 and a low rail 60 , each secured by a first end 61 to one of the barriers (in this case the barrier 24 left).
  • the high rail 59 is attached to the barrier 24 at the junction between the current hand 27 and the ramp 26, while the lowermost 60 is attached to the barrier 24 at the junction between the current hand 27 and the section 28. lower.
  • the rails 59, 60 are both semi-rigid, that is to say that they are not rigid in the manner of a metal profile, without being flexible in the manner of a thin rubber tube, or still a chain whose links would be free from each other (while being hooked to each other).
  • each rail 59, 60 is formed by association of a chain 62 with metal links (or rigid plastic) and a sheath 63 of plastic (or elastomer) in which is threaded the chain 62.
  • the length of the chain 62 is slightly greater than that of the sheath 63, so that only a few links of the chain 62 protrude from either side of the sheath 63 (typically one link on each side, as shown in the drawings).
  • each arm is in the form of a chain (preferably metal, especially steel) coated with a plastic material, typically a plastisol, typically based on PVC.
  • a plastic material typically a plastisol, typically based on PVC.
  • the coating of the chain is for example carried out by dipping in a plastisol bath, followed by drying in air or in an oven. This process gives the coated chain a semi-rigid character similar to the sheathing.
  • each rail 59, 60 to the barrier 24 is provided by its chain 62. This attachment can be made by riveting or by welding the end link on the barrier 24.
  • Each rail 59, 60 has a second end 64 opposite to the first 61, the second ends 64 of the rails 59, 60 being connected by a strip 65.
  • the strip 65 is fixed to the chains 62, and more precisely on end links of these, for example by riveting (or by screwing, or by welding).
  • the strip 65 is preferably rigid. It is for example made of a metallic material (or rigid plastic, for example PVC). As we see on the Figures 1 and 2 , The slide 65 has a U-shaped profile and has, in a closed position of the gate 32, fits onto the hand 27 of the current 25 opposite barrier (in this case the barrier 25 right) to the barrier 24 on which are directly fixed smooth 59, 60. the slider 65 is provided with removable hooking means 25 to the barrier against the barrier 24 to which are fixed the heald 59, 60.
  • removable fixing means are for example in the form of one (in the embodiment shown on the figure 1 ) or more (in the embodiment illustrated on the figure 2 ) cutout (s) buttonhole 66, the or each buttonhole 66 being adapted (s) to cooperate with a button 67 provided projecting on the hand 27 current.
  • the smooth 59, 60 hang freely, the strip 65 being detached from the barrier 25.
  • the user can freely access the floor 16, for example by using the 27 common hands during its rise.
  • the user grasps the strip 65 that fits on the current hand 27 of the barrier 25, by inserting the button 67 in the buttonhole 66 in a translation movement from top to bottom (to avoid any inadvertent withdrawal of the strip 65 ).
  • the rails 59, 60 thus extend transversely between the barriers 24, 25, themselves in the deployed position, the strip 65 being fitted on the hand 27 with the button 67 housed in the buttonhole 66 .
  • This embodiment of the gate 32 is advantageous in several ways.
  • the semi-rigid character of the rails 59, 60 makes it possible, in contrast to embodiments in which the rails are rigid, which require precise adjustments, to simplify manufacture.
  • the semi-rigid nature of the rails 59, 60 ensures, unlike soft heddles such as chains alone, a better maintenance of the user in danger of falling forward.
  • the hooking and unhooking of the strip 65 (and therefore of the door 32 ) by means of the strip 65 connecting the stringers 59, 56 can be made with one hand, for the benefit of the ergonomics and the simplicity of use.

Description

L'invention a trait aux marchepieds, notamment du type plateforme individuelle roulante (PIR) telle que définie par les normes françaises NF P 93-352 et NF P 93-353.The invention relates to running boards, including the individual rolling platform type (PIR) as defined by French standards NF P 93-352 and NF P 93-353.

Un marchepied comprend, classiquement, un plan avant ayant deux montants avant et au moins une marche reliant les montants avant, et un plan arrière ayant deux montants arrière et au moins un barreau reliant les montants arrière, monté articulé par rapport au plan avant. Les marchepieds du type PIR comprennent en outre un plancher monté entre le plan avant et le plan arrière pour permettre à un opérateur de travailler en hauteur sans fatigue, ses deux pieds reposant bien à plat sur le plancher, et des roues facilitant le déplacement du marchepied.A step conventionally comprises a front plane having two front uprights and at least one step connecting the front uprights, and a rear plane having two rear uprights and at least one bar connecting the rear uprights, hinged mounted relative to the front plane. The footboards of the PIR type further include a floor mounted between the front plane and the rear plane to allow an operator to work at height without fatigue, his two feet resting flat on the floor, and wheels facilitating the movement of the footboard .

Les marchepieds de ce type sont pliants, le plan arrière se rabattant sur le plan avant pour permettre un entreposage facile et relativement peu encombrant du marchepied.The steps of this type are folding, the rear plane tilting on the front plane to allow easy storage and relatively compact footboard.

Il n'est pas prévu de plier le marchepied pour se contenter de déplacer celui-ci sur site entre deux positions de travail voisines. Une telle manutention serait trop fatigante et fastidieuse. C'est pourquoi le marchepied est muni de roues. Plus précisément, sur un grand nombre de modèles, le plan arrière est muni de roues fixées aux montants arrière, et qui, lorsque le marchepied est déplié et repose au sol dans la position anormale de travail, sont surélevées par rapport au sol. Lorsque l'utilisateur souhaite déplacer le marchepied, il le saisit par le montant avant, le fait basculer en arrière jusqu'à ce que les roues touchent le sol, ce qui permet de le manoeuvrer et de le déplacer par roulement.It is not intended to bend the step to simply move it on site between two working positions nearby. Such handling would be too tiring and tedious. This is why the step is equipped with wheels. More specifically, on a large number of models, the rear plane is provided with wheels fixed to the rear uprights, and which, when the step is unfolded and rests on the ground in the abnormal working position, are raised above the ground. When the user wishes to move the step, he grasps it by the front upright, tilts it back until the wheels touch the ground, allowing it to be maneuvered and rolled.

Cette opération nécessite cependant suffisamment de force pour soulever le marchepied. Lorsque cette opération est répétée plusieurs fois par jour, voire plusieurs fois par heure, il en résulte une fatigue inutile pour l'utilisateur.This operation, however, requires sufficient force to lift the step. When this operation is repeated several times a day, or even several times an hour, this results in unnecessary fatigue for the user.

Des solutions ont été proposées pour faciliter le roulage des marchepieds Ainsi, le brevet américain US 6 026 931 propose une structure selon le préambule de la revendication 1 dans laquelle la partie arrière du marchepied est munie de roues arrière montées sur ressort, tandis que la partie avant du marchepied est munie d'une paire de roues avant montées sur un axe pivotant, le basculement des roues avant vers une position de déplacement étant commandée au pied par actionnement d'une pédale, associé à la descente de l'utilisateur du marchepied: Le basculement inverse des roues avant vers une position rétractée est provoqué par l'imposition d'un poids (en pratique, le poids de l'utilisateur) sur le marchepied.Solutions have been proposed to facilitate the running of the steps Thus, the US patent US 6,026,931 proposes a structure according to the preamble of claim 1 wherein the rear portion of the step is provided with rear wheels mounted on spring, while the front portion of the step is provided with a pair of front wheels mounted on an axis. pivoting, the tilting of the front wheels to a position of displacement being controlled by the foot by actuating a pedal, associated with the descent of the user of the step: The reverse tilting of the front wheels to a retracted position is caused by the imposition a weight (in practice, the weight of the user) on the running board.

Cette solution, en apparence satisfaisante, n'est cependant pas sans inconvénient, ni sans danger. En effet, s'il n'est pas contestable que les roues sont bien rétractées lorsque l'utilisateur est perché sur le marchepied, en revanche il est incontestable que le marchepied est mobile tant que le marchepied est libre de tout poids. Pour l'immobiliser, l'utilisateur doit donc poser sur le marchepied un poids suffisant pour provoquer la rétraction des roues avant, ce qu'il n'est pas toujours en mesure de faire. Lorsque le sol est en pente (ce qui est fréquent sur les chantiers), le marchepied risque donc de se dérober.This solution, apparently satisfactory, is not without inconvenience, nor without danger. Indeed, if it is undeniable that the wheels are well retracted when the user is perched on the step, however it is undeniable that the step is movable as the step is free of any weight. To immobilize, the user must put on the step sufficient weight to cause the retraction of the front wheels, which he is not always able to do. When the ground is sloping (which is common on construction sites), the footboard is likely to slip away.

En outre, il se peut que le seul poids de la jambe sur la première marche ne soit pas suffisant pour provoquer le basculement des roues avant vers leur position rétractée. L'utilisateur est donc exposé au risque de chute s'il n'impose pas, dès la première marche, un poids suffisant au marchepied.In addition, it may be that the sole weight of the leg on the first step is not sufficient to cause the tilting of the front wheels to their retracted position. The user is therefore exposed to the risk of falling if he does not impose, at the first step, a sufficient weight to the running board.

Un premier objectif est de proposer un marchepied roulant qui puisse être déplacé sans difficulté par l'utilisateur.A first objective is to propose a rolling step that can be moved without difficulty by the user.

Un deuxième objectif est de proposer un marchepied roulant qui présente une meilleure ergonomie pour l'utilisateur.A second objective is to propose a rolling step which presents a better ergonomics for the user.

Un troisième objectif est de proposer un marchepied roulant offrant une sécurité renforcée pour l'utilisateur.A third objective is to provide a rolling step providing enhanced safety for the user.

A cet effet, il est proposé un marchepied selon la revendication 1 comprenant :

  • un plan avant comprenant une paire de montants avant et au moins une marche reliant les montants avant,
  • un plan arrière monté articulé sur le plan avant et comprenant une paire de montants arrière et au moins un barreau reliant les montants arrière, les montants arrière se terminant par des extrémités qui, avec des extrémités des montants avant, définissent un plan de pose pour le marchepied dans une position dépliée de celle-ci, où le plan arrière forme un angle avec le plan avant,
  • une paire de roues arrière escamotables montées mobiles par rapport au plan arrière entre une position rétractée dans laquelle les roues arrière s'étendent au-dessus du plan de pose, et une position déployée dans laquelle les roues arrière dépassent du plan de pose vers le bas, chaque roue arrière étant sollicitée vers sa position déployée par un ressort
  • un train roulant avant comprenant une traverse montée basculante entre les montants avant et sur laquelle est fixée au moins une roue avant escamotable, le train roulant avant étant montée mobile par rapport au plan avant entre une position rétractée dans laquelle la roue avant s'étend au-dessus du plan de pose, et une position déployée dans laquelle la roue avant dépasse du plan de pose vers le bas,
  • un mécanisme d'actionnement de la roue avant, qui comprend au moins un levier de manoeuvre monté articulé sur un montant avant, et une tringle longeant le montant avant et couplant le levier au train roulant avant.
For this purpose, there is provided a step according to claim 1 comprising:
  • a front plane comprising a pair of front uprights and at least one step connecting the front uprights,
  • a rear plane mounted articulated on the front plane and comprising a pair of rear uprights and at least one bar connecting the rear uprights, the rear uprights ending in ends which, with ends of the front uprights, define a laying plane for the footboard in an unfolded position thereof, where the rear plane forms an angle with the front plane,
  • a pair of retractable rear wheels mounted movable relative to the rear plane between a retracted position in which the rear wheels extend above the laying plane, and an extended position in which the rear wheels protrude from the landing plane downwards. , each rear wheel being urged towards its deployed position by a spring
  • a running gear comprising a tilting cross member between the front uprights and on which is fixed at least one retractable front wheel, the front undercarriage being mounted movable relative to the front plane between a retracted position in which the front wheel extends to above the laying plane, and an extended position in which the front wheel protrudes from the laying plane downwards,
  • a mechanism for actuating the front wheel, which comprises at least one operating lever mounted hinged to a front upright, and a rod along the front upright and coupling the lever to the front undercarriage.

L'actionnement manuel du levier provoque le déploiement de la roue avant, ce qui permet de placer temporairement le marchepied dans une configuration de roulage permettant son déplacement aisé. Dès lors que le levier est relâché, la roue avant retrouve par gravité sa position rétractée, le marchepied reposant alors sur le sol au moins par ses montants avant, ce qui permet à l'utilisateur de monter dessus sans risque de dérobade.The manual operation of the lever causes the deployment of the front wheel, which allows to temporarily place the step in a rolling configuration for easy movement. As soon as the lever is released, the front wheel regains its retracted position by gravity, the step then resting on the ground at least by its front uprights, which allows the user to climb on it without risk of evasion.

Diverses caractéristiques supplémentaires peuvent être prévues, seules ou en combinaison :

  • le levier se présente sous forme d'une pièce à section en U, montée à cheval sur le montant.
  • le levier présente une paroi frontale d'appui, et deux parois latérales encadrant le montant et par lesquelles le levier est fixé sur le montant.
  • une paroi latérale du levier présente une portion d'extrémité à la quelle une extrémité supérieure de la tringle est fixée en liaison pivot.
  • la traverse est munie d'un retour en équerre auquel une extrémité inférieure de la tringle est fixée en liaison pivot.
  • le marchepied comprend un guide fixé sur le montant avant, et dans lequel la tringle est montée coulissante.
  • chaque roue arrière est fixée sur un montant arrière par l'intermédiaire d'une platine de fixation en U, comprenant une âme et deux bras en saillie transversale, la roue étant montée à l'extrémité inférieure d'un arbre support emmanché à coulissement aux extrémités des bras avec interposition du ressort.
Various additional features may be provided, alone or in combination:
  • the lever is in the form of a U-section piece, mounted astride the amount.
  • the lever has a front wall support, and two side walls flanking the amount and by which the lever is fixed on the amount.
  • a side wall of the lever has an end portion at which an upper end of the rod is fixed in pivot connection.
  • the cross member is provided with a right angle return to which a lower end of the rod is fixed in pivot connection.
  • the step comprises a guide fixed to the front upright, and wherein the rod is slidably mounted.
  • each rear wheel is fixed to a rear upright by means of a U-shaped mounting plate, comprising a web and two transversely projecting arms, the wheel being mounted at the lower end of a support shaft slidably fitted to ends of the arms with the interposition of the spring.

D'autres objets et avantages de l'invention apparaîtront à la lumière de la description d'un mode de réalisation, faite ci-après en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue en perspective montrant un marchepied équipé de roues escamotables et d'un portillon de garde-corps semi-rigide montré en position fermée en trait plein, et en position ouverte en pointillés ; trois médaillons illustrent, à échelle agrandie, des détails structurels du marchepied, respectivement, de haut en bas : une extrémité supérieure d'une baguette de fixation du portillon à une barrière latérale du garde-corps, une boutonnière de verrouillage de la baguette sur la barrière, et une roue arrière montée sur ressort sur le plan arrière ;
  • la figure 2 est une vue en perspective illustrant, à échelle identique, une variante de réalisation de la baguette de fixation du portillon ;
  • la figure 3 est une vue en perspective illustrant, à échelle identique, une variante de réalisation du train roulant avant équipé d'une paire de roues avant ;
  • la figure 4 est une vue de côté du marchepied de la figure 1, illustré dans une configuration de travail dans laquelle les roues sont toutes rétractées ; en médaillons sont illustrés, à échelle agrandie, des détails structurels du marchepied, respectivement, de haut en bas : le levier de manoeuvre du mécanisme d'actionnement, dans une position inactive ; le guide de tringle ; le train roulant avant ;
  • la figure 5 est une vue de détail en coupe illustrant le levier de manoeuvre du marchepied montré sur la figure 4, selon le plan de coupe V-V ;
  • la figure 6 est une vue similaire à la figure 4, montrant le marchepied dans une configuration de mobilité dans laquelle les roues sont toutes déployées ; en médaillons sont illustrés, à échelle agrandie, des détails structurels du marchepied, respectivement, de haut en bas et de gauche à droite : le levier de manoeuvre du mécanisme d'actionnement, dans une position active ; le train roulant avant ; l'extrémité inférieure du plan arrière avec les roues arrière déployées ;
  • la figure 7 est une vue de détail illustrant une roue arrière fixée sur un montant arrière ; à gauche, la roue est montrée dans sa position rétractée, tandis qu'à droite la roue est montrée dans sa position déployée.
Other objects and advantages of the invention will become apparent in the light of the description of an embodiment, given hereinafter with reference to the accompanying drawings, in which:
  • the figure 1 is a perspective view showing a step equipped with retractable wheels and a semi-rigid railing gate shown in the closed position in solid lines, and in the open position in dashed lines; three medallions illustrate, on an enlarged scale, structural details of the step, respectively, from top to bottom: an upper end of a wand of fixing the gate to a side barrier of the railing, a buttonhole of locking the wand on the barrier, and a rear wheel spring mounted on the rear plane;
  • the figure 2 is a perspective view illustrating, on an identical scale, an alternative embodiment of the gate fastening strip;
  • the figure 3 is a perspective view illustrating, on an identical scale, an alternative embodiment of the front undercarriage equipped with a pair of front wheels;
  • the figure 4 is a side view of the running board of the figure 1 , illustrated in a working configuration in which the wheels are all retracted; in medallions are illustrated, on an enlarged scale, structural details of the step, respectively, from top to bottom: the actuating lever of the actuating mechanism, in an inactive position; the rod guide; the front running gear;
  • the figure 5 is a detailed sectional view illustrating the operating lever of the step shown on the figure 4 , according to the VV cutting plane;
  • the figure 6 is a view similar to the figure 4 , showing the step in a mobility configuration in which the wheels are all deployed; in medallions are illustrated, on an enlarged scale, structural details of the step, respectively, from top to bottom and from left to right: the actuating lever of the actuating mechanism, in an active position; the front running gear; the lower end of the rear plane with the rear wheels deployed;
  • the figure 7 is a detail view illustrating a rear wheel attached to a rear pillar; on the left, the wheel is shown in its retracted position, while on the right the wheel is shown in its extended position.

Sur la figure 1 est représenté un marchepied 1 destiné à permettre le travail en hauteur. Dans l'exemple illustré, le marchepied 1 est du type plateforme individuelle roulante.On the figure 1 is represented a step 1 intended to allow work at height. In the example illustrated, the step 1 is of the individual rolling platform type.

Le marchepied 1 comprend un plan 2 avant ayant une paire de montants 3 avant et au moins une marche 4 reliant transversalement les montants 3 avant. Dans l'exemple illustré, le marchepied 1 comprend une marche 4 unique. En variante, plusieurs marches (notamment trois ou cinq) pourraient être prévues. Les montants 3 sont en l'espèce formés de profilés métalliques (par exemple en aluminium ou en alliage d'aluminium), notamment à section rectangulaire. A des extrémités 5 inférieures, les montants 3 sont munis de patins 6 antidérapants.The step 1 comprises a front plane 2 having a pair of uprights 3 front and at least one step 4 transversely connecting the uprights 3 before. In the example shown, the step 1 comprises a single step 4 . Alternatively, several steps (including three or five) could be provided. The amounts 3 are in this case formed of metal profiles (for example aluminum or aluminum alloy), in particular rectangular section. At lower ends 5, the uprights 3 are provided with pads 6 slip.

Comme illustré sur la figure 1, la marche 4 est formée d'une tôle découpée pliée. La marche 4 présente un nez 7 de marche formé par un repli qui s'étend en saillie du plan 2 avant, prolongé vers le bas par un rebord 8 inférieur par lequel la marche 4 est fixée sur les montants 3, notamment par rivetage.As illustrated on the figure 1 , the step 4 is formed of a folded cut sheet. The step 4 has a nose 7 of step formed by a fold which extends projecting from the front plane 2 , extended downwards by a lower edge 8 by which the step 4 is fixed on the uprights 3, in particular by riveting.

Le marchepied 1 comprend en outre un plan 9 arrière monté articulé sur le plan 2 avant, et ayant une paire de montants 10 arrière et au moins un barreau 11 reliant les montants 10 arrière.The step 1 further comprises a rear plane 9 hinged to the front plane 2 and having a pair of rear uprights 10 and at least one bar 11 connecting the rear uprights 10 .

Dans l'exemple illustré, les montants 10 arrière sont, comme les montants 3 avant, formés de profilés métalliques (par exemple en aluminium ou en alliage d'aluminium), notamment à section rectangulaire. A des extrémités 12 inférieures, les montants 10 arrière sont munis de patins 6 antidérapants. Lorsque le marchepied 1 est déplié (configuration illustrée sur les figures), le plan 9 arrière forme un angle avec le plan 2 avant, et les extrémités 12 inférieures des montants 10 arrière forment, avec les extrémités 5 inférieures des montants 3 avant, un plan P de pose (en pointillés) pour le marchepied 1, correspondant à un sol S idéalement plan sur lequel reposerait le marchepied 1. In the illustrated example, the rear uprights 10 are, like before uprights 3, formed of metal profiles (e.g. aluminum or aluminum alloy), in particular with a rectangular section. At lower ends 12, the rear uprights 10 are provided with pads 6 slip. When the step 1 is unfolded (configuration illustrated in the figures), the plane 9 back forms an angle with the plane 2 before, and 12 lower ends of the posts back 10 form, with the 5 lower ends of the uprights 3 before a plan P laying (dashed) for the step 1, corresponding to a floor S ideally plan on which rest the step 1.

Dans l'exemple illustré, le plan 9 arrière comprend trois barreaux 11. Ces barreaux 11 sont en l'espèce à section carrée, mais cette section pourrait être circulaire ou encore ovale. En fonction de la hauteur du marchepied 1, le nombre de barreaux 11 pourrait être différent (notamment supérieur). La fixation des barreaux 11 aux montants 10 arrière est ici réalisée par bouterollage.In the example shown, the rear plane 9 comprises three bars 11. These bars 11 are in this case square section, but this section could be circular or oval. Depending on the height of the step 1, the number of bars 11 could be different (especially higher). Fixing the bars 11 rear uprights 10 is here made by bouterollage.

Le plan 9 arrière est monté articulé par rapport au plan 2 avant à des extrémités 13 supérieures des montants 10 arrière, lesquels sont plus courts que les montants 3 avant. L'axe de pivotement du plan arrière est formé par des vis 14 solidaires de platines 15 fixées (en l'espèce par boulonnage) sur des faces latérales externes des montants 3 avant, comme illustré sur les figures. 9 the rear plane is mounted articulated with respect to the plane of the two front ends 13 of the upper rear uprights 10, which are shorter than the uprights 3 before. The pivot axis of the rear plane is formed by screws 14 secured to fixed plates 15 (in this case by bolting) on external lateral faces of the uprights 3 before, as shown in the figures.

Le marchepied 1 comprend, par ailleurs, un plancher 16 qui s'étend à cheval entre le plan 2 avant et le plan 9 arrière en configuration dépliée du marchepied 1. Ce plancher 16 est monté articulé par rapport au plan 2 avant par l'intermédiaire d'un linteau 17 cylindrique emboîté sur un barreau 18 de liaison des montants 3 avant. Le plancher 16 est par ailleurs articulé par rapport au plan 9 arrière par l'intermédiaire de bielles 19, le plancher 16 reposant, en configuration déployée, sur un barreau 11 de liaison des montants 10 arrière.The step 1 further comprises a floor 16 which extends astride between the front plane 2 and the rear plane 9 in unfolded configuration of the step 1. This floor 16 is hingedly mounted relative to the front plane 2 via of a cylindrical lintel 17 fitted on a bar 18 connecting the uprights 3 before. The floor 16 is also articulated relative to the rear plane 9 by means of connecting rods 19, the floor 16 resting in the deployed configuration, a rod 11 connecting the struts 10 back.

Selon un mode de réalisation préféré illustré sur les figures, le plancher 16 peut être pourvu d'une plinthe 20 couvrant trois côtés du plancher 16, à l'exception d'un bord avant pour faciliter l'accès de l'utilisateur au plancher 16 par le plan 2 avant. Cette plinthe 20 forme une butée pour les pieds de l'utilisateur et évite ainsi à celui-ci de trébucher, limitant les risques de chute.According to a preferred embodiment illustrated in the figures, the floor 16 may be provided with a baseboard 20 covering three sides of the floor 16, with the exception of a front edge to facilitate the access of the user to the floor 16 by plane 2 before. This baseboard 20 forms a stop for the feet of the user and thus prevents it from tripping, limiting the risk of falling.

Le marchepied 1 est également équipé d'une tablette 21 porte-outil (ou porte-colis), qui s'étend transversalement entre les montants 3 avant, à une extrémité supérieure de ceux-ci. Dans le mode de réalisation illustré, la tablette 21 est fixée aux montants 3 avant par l'intermédiaire de ferrures 22 chevauchant un barreau 11 supérieur de liaison des montants 10 arrière.The step 1 is also equipped with a shelf 21 tool holder (or package carrier), which extends transversely between the uprights 3 before, at an upper end of these. In the illustrated embodiment, the shelf 21 is fixed to the front uprights 3 by means of fittings 22 overlapping a top bar 11 connecting the rear uprights 10 .

Le marchepied 1 est par ailleurs équipé d'un garde-corps 23, monté sur le plan 2 avant à l'aplomb du plancher 16 en configuration dépliée du marchepied 1, et destiné à retenir l'utilisateur en cas de déséquilibre, de manière à minimiser le risque de chute.The step 1 is also equipped with a railing 23, mounted on the front plane 2 in line with the floor 16 in unfolded configuration of the step 1, and intended to retain the user in case of imbalance, so as to minimize the risk of falling.

Ce garde-corps 23 est repliable. Il comprend une paire de barrières latérales, à savoir une barrière 24 gauche et une barrière 25 droite, chacune montée articulée sur un montant 3 avant entre une position déployée (illustrée sur les figures) dans laquelle chaque barrière 24, 25 s'étend sensiblement perpendiculairement au plan 2 avant, et une position rabattue dans laquelle chaque barrière 24, 25 s'étend contre le plan 2 avant. Chaque barrière 24, 25 présente un profil en U et est de préférence formée d'un tube métallique (par exemple en aluminium ou en alliage d'aluminium) plié. Chaque barrière 24, 25 présente une section supérieure ou rampe 26, destinée à s'étendre à hauteur du tronc de l'utilisateur (entre la ceinture et le buste), une section intermédiaire ou main 27 courante (visible, pour la barrière 25 droite, par transparence en pointillés sur les figures 1 et 4), verticale en position déployée de la barrière 24, 25 et en configuration dépliée du marchepied 1, et une section 28 inférieure. Chaque barrière 24, 25 est articulée par rapport au montant 3 avant par sa rampe 26 et sa section 28 inférieure, toutes deux montées sur des pivots 29 coaxiaux (formés en l'espèce par des vis) solidaires de chapes 30 dans lesquelles viennent se loger, en position déployée, des extrémités respectives de la rampe 26 et de la section 28 inférieure, comme illustré sur la figuré 1.This railing 23 is collapsible. It comprises a pair of side rails, namely a barrier 24 left and 25 right barrier, each pivotally mounted on a front upright 3 between an extended position (shown in the figures) in which each fence 24, 25 extends substantially perpendicularly in front plane 2 , and a folded position in which each barrier 24, 25 extends against the front plane 2 . Each barrier 24, 25 has a U-shaped profile and is preferably formed of a metal tube (for example aluminum or aluminum alloy) folded. Each barrier 24, 25 has an upper section or ramp 26, intended to extend at the height of the trunk of the user (between the belt and the bust), an intermediate section or main 27 current (visible, for the barrier 25 right , by dashed transparency on the figures 1 and 4 ), vertical in the deployed position of the barrier 24, 25 and in unfolded configuration of the step 1, and a lower section 28 . Each barrier 24, 25 is hinged relative to the upright 3 before by its ramp 26 and its lower section 28 , both mounted on coaxial pivots 29 (formed in this case by screws) secured to clevises 30 in which are housed in the deployed position, the respective ends of the ramp 26 and the lower section 28 , as illustrated in FIG.

Des verrous 31, par exemple sous forme de fils repliés à l'équerre montés pivotants par rapport aux montants 3 avant, assurent le maintien réversible des barrières 24, 25 en position déployée.Latches 31, for example in the form of son folded to the bracket pivotally mounted relative to the uprights 3 before, ensure the reversible maintenance of the barriers 24, 25 in the deployed position.

Le garde-corps 23 comprend en outre un portillon 32 mobile destiné à retenir l'utilisateur déséquilibré vers l'avant du marchepied, tout en délimitant l'espace de travail de sorte qu'un seul utilisateur puisse se mouvoir avec aisance sur le plancher 16. Le portillon 32 sera décrit plus en détail ci-après.The railing 23 further comprises a movable gate 32 for retaining the unbalanced user forward of the step, while delimiting the work area so that a single user can move with ease on the floor 16 . The gate 32 will be described in more detail below.

Pour permettre la mobilité du marchepied 1 en configuration dépliée lorsque l'utilisateur en est descendu, le marchepied 1 est pourvu de roues escamotables.To allow the mobility of the step 1 in unfolded configuration when the user is lowered, the step 1 is provided with retractable wheels.

Plus précisément, le marchepied 1 est équipé d'une paire de roues 33 arrière escamotables montées mobiles par rapport au plan 9 arrière entre une position rétractée dans laquelle les roues 33 arrière s'étendent au-dessus du plan P de pose, et une position déployée dans laquelle les roues 33 arrière s'étendent au moins partiellement au-dessous du plan P de pose. Chaque roue 33 arrière est sollicitée en permanence vers sa position déployée par un ressort 34 (en l'espèce un ressort de compression). Selon un mode de réalisation préféré illustré sur les figures, chaque roue 33 arrière est montée sur un montant 9 arrière par l'intermédiaire d'une platine 35 de fixation en U, comprenant une âme 36 par laquelle la platine 35 est fixée (en l'espèce par vissage) au montant 10, et deux bras 37 en saillie transversale.Specifically, the step 1 is equipped with a pair of retractable rear wheels 33 movably mounted relative to the rear plane 9 between a retracted position in which the rear wheels 33 extend above the laying plane P , and a position deployed in which the rear wheels 33 extend at least partially below the laying plane P. Each rear wheel 33 is permanently biased towards its deployed position by a spring 34 (in this case a compression spring). According to a preferred embodiment illustrated in the figures, each rear wheel 33 is mounted on a rear upright 9 by means of a U-shaped mounting plate 35 , comprising a core 36 through which the plate 35 is fixed (in species by screwing) to the amount 10, and two arms 37 projecting transverse.

La roue 33 est montée à l'extrémité inférieure d'un arbre 38 support, emmanché à coulissement aux extrémités des bras 37 avec interposition du ressort 34, comme illustré en médaillon sur la figure 1, et sur la figure 7. Comme on le voit sur la figure 1, un cache peut être emboîté sur la platine 35 pour couvrir le ressort et ainsi éviter que des poussières et débris du chantier ne viennent contrarier le bon fonctionnement du ressort 34. Sur la figure 1, un seul cache est visible (à droite), le cache de gauche ayant été omis (comme sur la figure 7) pour laisser apparaître le ressort 34 et la platine 35. The wheel 33 is mounted at the lower end of a support shaft 38 , slidably fitted to the ends of the arms 37 with the interposition of the spring 34, as illustrated in the inset on the figure 1 , and on the figure 7 . As we see on the figure 1 , a cover can be fitted on the plate 35 to cover the spring and thus prevent dust and debris from the construction site come to hinder the proper functioning of the spring 34. On the figure 1 , only one cache is visible (on the right), the left cache having been omitted (as on the figure 7 ) to reveal the spring 34 and the plate 35.

Le ressort 34 est taré pour que :

  • lorsqu'une masse dépassant un seuil prédéterminé est placé sur le marchepied 1 en configuration dépliée sensiblement à la verticale de son centre de gravité (typiquement un utilisateur perché sur le plancher 16), le ressort 34 soit comprimé au point que la roue 33 soit tangente au plan P de pose au-dessus de celui-ci, comme illustré à gauche sur la figure 7,
  • en revanche, la masse du marchepied 1 seul (en l'absence de masse supplémentaire, et en particulier lorsqu'aucun utilisateur n'est perché sur le plancher 16), ne suffise pas à comprimer le ressort 34 au point que la roue 33 s'étende au-dessus du plan P de pose, la roue 33 dépassant alors du plan P de pose vers le bas sous l'action du ressort 34, comme illustré à droite sur la figure 7.
The spring 34 is tared so that:
  • when a mass exceeding a predetermined threshold is placed on the step 1 in unfolded configuration substantially vertical to its center of gravity (typically a user perched on the floor 16 ), the spring 34 is compressed to the point that the wheel 33 is tangent to the plane P of installation above it, as shown on the left on the figure 7 ,
  • on the other hand, the mass of the step 1 alone (in the absence of additional mass, and in particular when no user is perched on the floor 16 ), is not sufficient to compress the spring 34 to the point that the wheel 33 s extended above the laying plane P , the wheel 33 then protruding from the plane P of laying down under the action of the spring 34, as illustrated on the right on the figure 7 .

En d'autres termes, lorsque l'utilisateur est perché sur le marchepied 1, les roues 33 arrière sont rétractées et le marchepied 1 repose sur le sol S, au niveau du plan 9 arrière, par ses patins 6. Lorsque l'utilisateur n'est pas perché sur le marchepied 1, les roues 33 arrière sont déployées et le marchepied 1 repose, au niveau du plan 9 arrière, sur le sol S par ses roues 33 arrière, le plan P de pose étant surélevé par rapport au sol S. In other words, when the user is perched on the step 1, the rear wheels 33 are retracted and the step 1 rests on the ground S, at the rear plane 9 , by its pads 6. When the user is not perched on the step 1, the rear wheels 33 are deployed and the step 1 rests, at the rear plane 9 , on the ground S by its rear wheels 33 , the laying plane P being raised relative to the ground S .

Bien que les roues 33 arrière soient représentées dans une position dans laquelle elles s'étendent sensiblement parallèlement au plan 9 arrière, elles sont toutefois montées librement pivotantes tant autour de leur axe central de roulage qu'autour de leur arbre 38 support.Although the rear wheels 33 are shown in a position in which they extend substantially parallel to the rear plane 9, they are however mounted freely pivotable both around their central axis of rolling and around their shaft 38 support.

Le marchepied 1 comprend en outre un train 39 roulant avant, équipé d'une roue 40 avant escamotable (comme illustré sur la figure 1), ou de deux roues ou plus, comme illustré dans la variante de la figure 3.The step 1 further comprises a train 39 rolling forward, equipped with a wheel 40 before retractable (as shown on the figure 1 ), or two or more wheels, as shown in the variant of the figure 3 .

Le train 39 roulant avant est monté mobile par rapport au plan 2 avant entre une position rétractée dans laquelle la roue 40 avant s'étend au-dessus du plan P de pose (figure 4), et une position déployée dans laquelle la roue 40 avant dépasse du plan P de pose vers le bas (figure 6).The forward rolling gear 39 is movably mounted relative to the front plane 2 between a retracted position in which the front wheel 40 extends above the laying plane P (FIG. figure 4 ), and an extended position in which the front wheel 40 protrudes from the laying plane P ( figure 6 ).

Selon l'invention, le train 39 roulant comprend une traverse 41 ayant de préférence un profil sensiblement en U montée basculante entre les montants 3 avant, au voisinage de leurs extrémités 5 inférieures. Comme illustré sur les figures 1 et 3, la traverse 41 comprend une section 42 centrale, qui s'étend transversalement, et, aux extrémités opposées de la section 42 centrale, deux retours 43 en équerre par lesquels la traverse 41 est montée en rotation sur les montants 3 avant, par exemple par boulonnage (mais cette fixation pivotante pourrait être réalisée par vissage ou encore par rivetage).According to the invention, the undercarriage 39 comprises a cross member 41 preferably having a profile substantially U pivotally mounted between the uprights 3 back in the vicinity of their lower ends 5. As illustrated on Figures 1 and 3 the cross-member 41 comprises a central section 42 , which extends transversely, and at the opposite ends of the central section 42 , two angled returns 43 through which the cross-member 41 is rotatably mounted on the uprights 3 before, for example by bolting (but this pivoting attachment could be made by screwing or riveting).

Lorsque le marchepied 1 comprend une roue 40 avant unique (dans l'exemple de la figure 1), cette roue 40 est de préférence montée au centre de la section 42 centrale. Mais la roue 40 pourrait être légèrement déportée latéralement, à condition qu'il n'en résulte pas un déséquilibrage du marchepied 1. De même, lorsque le marchepied 1 comprend une paire de roues 40 avant (dans l'exemple de la figure 3), ces roues 40 sont de préférence montées sur la section 42 centrale au voisinage des retours 43, de sorte à maximiser la stabilité du marchepied 1, mais les roues 43 pourraient être déportées vers le centre de la section 42 centrale.When the step 1 comprises a single front wheel 40 (in the example of the figure 1 ), this wheel 40 is preferably mounted in the center of the central section 42 . But the wheel 40 could be slightly offset laterally, provided that it does not result in an unbalance of the step 1. Similarly, when the step 1 comprises a pair of wheels 40 before (in the example of the figure 3 ) these wheels 40 are preferably mounted on the central section 42 in the vicinity of the returns 43, so as to maximize the stability of the step 1, but the wheels 43 could be deported to the center of the central section 42 .

Comme on le voit bien sur les figures 4 et 6, la ou chaque roue 40 avant est montée sur la traverse 41 au moyen d'un arbre 44 boulonné sur une équerre 45 de fixation solidaire de la traverse 41. Comme les roues 33 arrière, la ou chaque roue 40 avant est librement pivotante tant autour de son axe de roulage qu'autour de son arbre 44 support.As can be seen from the figures 4 and 6 , the or each front wheel 40 is mounted on the cross member 41 by means of a shaft 44 bolted to a bracket 45 secured to the cross member 41. Like the rear wheels 33 , the or each wheel 40 before is freely pivoting around of its driving axis that around its shaft 44 support.

Ainsi que représenté notamment sur les figures 4 et 6, le marchepied 1 comprend en outre un mécanisme 46 d'actionnement de la roue 40 avant pour commander sont déploiement (en prévision du déplacement du marchepied 1) ou à l'inverse lui permettre de se rétracter.As represented in particular on figures 4 and 6 , the step 1 further comprises a mechanism 46 for actuating the wheel 40 before to control deployment (in advance of the displacement of the step 1) or conversely allow it to retract.

Ce mécanisme 46 d'actionnement comprend au moins un levier 47 de manoeuvre monté articulé sur un montant 3 avant, ainsi qu'une tringle 48 couplant le levier 47 au train 39 roulant avant.This actuating mechanism 46 comprises at least one lever 47 maneuvering articulated on a post 3 before, and a rod 48 coupling the lever 47 to the train 39 rolling forward.

Selon un mode de réalisation préféré illustré sur les figures, et plus particulièrement sur la figure 5, le levier 47 se présente sous forme d'une pièce (métallique ou plastique) à section en U, montée à cheval sur le montant 3. La fixation du levier 47 est par exemple réalisée au moyen d'un boulon 49 qui forme l'axe de pivotement du levier 47. Le levier 47 présente une paroi 50 frontale, sur laquelle vient appuyer l'utilisateur pour faire basculer le levier 47 autour de son axe, et deux parois latérales, à savoir une paroi 51 latérale externe et une paroi 52 latérale interne, qui encadrent le montant 3 et par lesquelles le levier 47 est fixé sur le montant 3.According to a preferred embodiment illustrated in the figures, and more particularly on the figure 5 , the lever 47 is in the form of a U-shaped section (metal or plastic) mounted on the upright 3. The lever 47 is secured, for example, by means of a bolt 49 which forms the pivoting axis of the lever 47. The lever 47 has a front wall 50 , on which is pressed the user to tilt the lever 47 about its axis, and two side walls, namely an outer wall 51 and a wall 52 internal side, which frame the amount 3 and by which the lever 47 is fixed on the amount 3 .

Comme illustré sur les figures 4, 5 et 6, l'une des parois latérales (en l'occurrence la paroi 52 interne) présente une portion 53 d'extrémité qui dépasse du montant 3 à l'opposé de la paroi 50 frontale vers l'intérieur du marchepied 1. Dans cette portion 53 d'extrémité est réalisé un perçage 54 dans lequel est introduite une extrémité 55 supérieure repliée de la tringle 48 (laquelle se présente en l'espèce sous forme d'une tige métallique à section circulaire de faible diamètre) pour réaliser la liaison pivot entre la tringle 48 et le levier 47 de manoeuvre.As illustrated on Figures 4, 5 and 6 , one of the side walls (in this case the inner wall 52 ) has an end portion 53 which protrudes from the upright 3 opposite the front wall 50 towards the inside of the step 1. In this portion 53 end is made a piercing 54 in which is introduced a folded upper end 55 of the bead wire 48 (which is in this case in the form of a metal rod with small diameter circular section) to achieve the pivot connection between the rod 48 and the lever 47 for maneuvering.

De même, l'un des retours 43 en équerre de la traverse 41 est percée d'un trou 56 dans lequel est introduite une extrémité 57 inférieure repliée de la tringle 48 pour réaliser la liaison pivot entre la tringle 48 et la traverse 41. Similarly, one of the returns 43 at right angles to the cross member 41 is pierced with a hole 56 into which is introduced a folded lower end 57 of the bead wire 48 to provide the pivot connection between the bead wire 48 and the cross member 41.

La tringle 48 longe le montant 3 avant, le perçage 54 dans le levier 47 et le trou 56 dans la traverse 41 étant situés au voisinage d'une face arrière du montant 3. Pour éviter le flambage de la tringle 48 lors de sa manoeuvre, le marchepied 1 est équipé d'un guide 58 fixé sur le montant 3 sensiblement à mi-distance du levier 47 et du train 39 roulant avant, et dans lequel la tringle 48 est montée coulissante. Ce guidage permet d'employer pour la réalisation de la tringle 48 une tige de faible diamètre, qui aura l'avantage de la légèreté et de la discrétion visuelle. La tringle 48 longeant le montant 3 avant, elle ne présente aucune gène ni aucun risque pour l'utilisateur. L'esthétique du marchepied 1 est en outre préservée.The rod 48 runs along the upright 3 before, the bore 54 in the lever 47 and the hole 56 in the crossbar 41 being situated in the vicinity of a rear face of the upright 3. To avoid buckling of the rod 48 during its operation, the step 1 is equipped with a guide 58 fixed on the upright 3 substantially midway between the lever 47 and the train 39 rolling forward, and wherein the rod 48 is slidably mounted. This guidance allows to use for the realization of the rod 48 a small diameter rod, which will have the advantage of lightness and visual discretion. The rod 48 along the amount 3 before, it does not present any gene or any risk for the user. The aesthetics of step 1 are also preserved.

En configuration dépliée du marchepied 1, que celui-ci supporte une charge ou non, la roue 40 avant s'étend au-dessus du plan P de pose. En pratique, la roue 40 avant repose par gravité sur le sol S, confondu dans cette situation avec le plan P de pose.In unfolded configuration of the step 1, whether it supports a load or not, the front wheel 40 extends above the laying plane P. In practice, the wheel 40 before rests by gravity on the ground S, confused in this situation with the laying plane P.

Lorsque l'utilisateur souhaite déplacer le marchepied 1 dont il est descendu, il lui suffit d'actionner le levier 47 en le faisant basculer en direction du montant 3, par appui manuel sur la paroi 50 frontale jusqu'à ce que celle-ci vienne buter (figure 4) contre le montant 3 avant. Cette action fait basculer, via la tringle 48, la traverse 41 et place la roue 40 avant dans sa position déployée. Les roues 33 arrière étant déjà en position déployée en l'absence de charge suffisante sur le marchepied 1, celui-ci se trouve placé dans une configuration de roulage (figure 6) où il repose sur le sol S par ses roues 33, 40, le plan P de pose étant surélevé par rapport au sol S.When the user wishes to move the step 1 from which it is descended, it is sufficient to actuate the lever 47 by tilting towards the upright 3, by manual support on the front wall 50 until it comes abut ( figure 4 ) against the amount 3 before. This action switches, via the rod 48, the cross 41 and places the wheel 40 before in its deployed position. The rear wheels 33 are already in the deployed position in the absence of sufficient load on the step 1, it is placed in a rolling configuration ( figure 6 ) where it rests on the ground S by its wheels 33, 40, the laying plane P being raised relative to the ground S.

Il suffit ensuite à l'utilisateur, tout en maintenant la pression sur le levier 47, de déplacer le marchepied 1 dans sa configuration de roulage jusqu'à la position désirée, puis de relâcher le levier 47. Les roues 33 arrière demeureront en position déployée (les montants 10 arrière demeurant ainsi surélevés par rapport au sol S), mais la roue 40 avant retrouvera par gravité sa position rétractée cependant que les montants 3 avant reprendront contact avec le sol S). Cette configuration intermédiaire (roues 33 arrières déployées, roue(s) 40 avant rétractée(s)) permet à l'utilisateur de remonter sur le marchepied 1 en toute sécurité, les montants 3 avant assurant, via les patins 6, le maintien en position du marchepied 1 sans risque de dérobade inopinée de celui-ci.It is then sufficient for the user, while maintaining the pressure on the lever 47, to move the step 1 in its running configuration to the desired position, then release the lever 47. The rear wheels 33 will remain in the deployed position (amounts remaining 10 back and raised above ground S), but the wheel 40 before gravity regain its retracted position while the uprights 3 before resume contact with the ground S). This intermediate configuration (rear wheels 33 deployed, wheel (s) 40 before retracted (s)) allows the user to go back on the step 1 safely, the uprights 3 before ensuring, via the pads 6, the holding in position of the step 1 without risk of sudden evasion of it.

La course angulaire du levier 47 de manoeuvre (et donc de la traverse 41) n'est pas nécessairement importante. De fait, dans l'exemple illustré, cette course angulaire est faible, de l'ordre de (ou inférieure à) 15° environ. Il suffit en effet que la position déployée de la roue 40 (ou des roues) avant provoque une légère surélévation des montants 3 avant pour permettre le roulage du marchepied 1. The angular travel of the operating lever 47 (and thus of the crossbar 41 ) is not necessarily important. In fact, in the illustrated example, this angular stroke is small, of the order of (or less than) about 15 °. It is sufficient that the extended position of the wheel 40 (or wheels) before causes a slight elevation of the uprights 3 before to allow the running of the step 1.

Selon un mode de réalisation alternatif, non représenté, un deuxième levier est prévu sur l'autre montant 3 avant, pour assurer une commande du basculement du train 39 roulant avant à deux mains. En variante, une barre transversale peut relier les leviers pour synchroniser leur basculement, à la manière d'une barre anti-panique de porte coupe-feu.According to an alternative embodiment, not shown, a second lever is provided on the other post 3 before, to ensure control of the tilting gear 39 rolling front two hands. Alternatively, a crossbar can connect the levers to synchronize their tilting, in the manner of a panic bar fire door.

On décrit à présente le portillon 32, en référence aux figures 1 et 2.Door 32 is now described with reference to the Figures 1 and 2 .

Le portillon 32 est mobile entre une position ouverte (en pointillés sur la figure 2) et une position fermée (en trait continu sur la figure 2). Le portillon 32 comprend une lisse 59 haute et une lisse 60 basse, chacune assujettie, par une première extrémité 61, à l'une des barrières (en l'espèce la barrière 24 gauche). Plus précisément, la lisse 59 haute est fixée à la barrière 24 à la jonction entre la main 27 courante et la rampe 26, tandis que la lisse 60 basse est fixée à la barrière 24 à la jonction entre la main 27 courante et la section 28 inférieure.The gate 32 is movable between an open position (dashed on the figure 2 ) and a closed position (in solid line on the figure 2 ). The gate 32 comprises a high rail 59 and a low rail 60 , each secured by a first end 61 to one of the barriers (in this case the barrier 24 left). Specifically, the high rail 59 is attached to the barrier 24 at the junction between the current hand 27 and the ramp 26, while the lowermost 60 is attached to the barrier 24 at the junction between the current hand 27 and the section 28. lower.

Les lisses 59, 60 sont toutes deux semi-rigides, c'est-à-dire qu'elles ne sont pas rigides à la manière d'un profilé métallique, sans être souples à la manière d'un tube mince en caoutchouc, ou encore d'une chaîne dont les maillons seraient libres les uns par rapport aux autres (tout en étant cependant accrochés les uns aux autres).The rails 59, 60 are both semi-rigid, that is to say that they are not rigid in the manner of a metal profile, without being flexible in the manner of a thin rubber tube, or still a chain whose links would be free from each other (while being hooked to each other).

Selon un mode de réalisation préféré illustré sur la figure 1, chaque lisse 59, 60 est formée par association d'une chaîne 62 à maillons métalliques (ou en plastique rigide) et d'une gaine 63 en plastique (ou en élastomère) dans laquelle est enfilée la chaîne 62. La longueur de la chaîne 62 est légèrement supérieure à celle de la gaine 63, en sorte que seuls quelques maillons de la chaîne 62 dépassent de part et d'autre de la gaine 63 (typiquement un maillon de chaque côté, comme illustré sur les dessins).According to a preferred embodiment illustrated on the figure 1 each rail 59, 60 is formed by association of a chain 62 with metal links (or rigid plastic) and a sheath 63 of plastic (or elastomer) in which is threaded the chain 62. The length of the chain 62 is slightly greater than that of the sheath 63, so that only a few links of the chain 62 protrude from either side of the sheath 63 (typically one link on each side, as shown in the drawings).

Dans une variante (non représentée), chaque lisse se présente sous forme d'une chaîne (de préférence métallique, notamment en acier) enduite d'un matériau plastique, typiquement un plastisol, typiquement à base de PVC. L'enduction de la chaîne est par exemple réalisée par trempage dans un bain de plastisol, suivi d'un séchage à l'air ou en étuve. Ce procédé confère à la chaîne enduite un caractère semi-rigide similaire au gainage.In a variant (not shown), each arm is in the form of a chain (preferably metal, especially steel) coated with a plastic material, typically a plastisol, typically based on PVC. The coating of the chain is for example carried out by dipping in a plastisol bath, followed by drying in air or in an oven. This process gives the coated chain a semi-rigid character similar to the sheathing.

La fixation de chaque lisse 59, 60 à la barrière 24 est assurée par sa chaîne 62. Cette fixation peut être réalisée par rivetage ou encore par soudure du maillon d'extrémité sur la barrière 24. The attachment of each rail 59, 60 to the barrier 24 is provided by its chain 62. This attachment can be made by riveting or by welding the end link on the barrier 24.

Chaque lisse 59, 60 présente une deuxième extrémité 64 opposée à la première 61, les deuxièmes extrémités 64 des lisses 59, 60 étant reliées par une réglette 65. La réglette 65 est fixée aux chaînes 62, et plus précisément sur des maillons d'extrémité de celles-ci, par exemple par rivetage (ou par vissage, ou encore par soudure).Each rail 59, 60 has a second end 64 opposite to the first 61, the second ends 64 of the rails 59, 60 being connected by a strip 65. The strip 65 is fixed to the chains 62, and more precisely on end links of these, for example by riveting (or by screwing, or by welding).

La réglette 65 est de préférence rigide. Elle est par exemple réalisée dans un matériau métallique (ou en plastique rigide, par exemple en PVC). Comme on le voit sur les figures 1 et 2, la réglette 65 présente un profil en U et vient, dans une position fermée du portillon 32, s'emboîter sur la main 27 courante de la barrière 25 opposée (en l'espèce la barrière 25 droite) à la barrière 24 sur laquelle sont directement fixées les lisses 59, 60. La réglette 65 est munie de moyens d'accrochage amovible à la barrière 25 opposée à la barrière 24 à laquelle sont fixées les lisses 59, 60. Ces moyens de fixation amovible se présentent par exemple sous forme d'une (dans le mode dé réalisation illustré sur la figure 1) ou plusieurs (dans le mode de réalisation illustré sur la figure 2) découpe(s) en boutonnière 66, la ou chaque boutonnière 66 étant apte(s) à coopérer avec un bouton 67 prévu en saillie sur la main 27 courante.The strip 65 is preferably rigid. It is for example made of a metallic material (or rigid plastic, for example PVC). As we see on the Figures 1 and 2 , The slide 65 has a U-shaped profile and has, in a closed position of the gate 32, fits onto the hand 27 of the current 25 opposite barrier (in this case the barrier 25 right) to the barrier 24 on which are directly fixed smooth 59, 60. the slider 65 is provided with removable hooking means 25 to the barrier against the barrier 24 to which are fixed the heald 59, 60. These removable fixing means are for example in the form of one (in the embodiment shown on the figure 1 ) or more (in the embodiment illustrated on the figure 2 ) cutout (s) buttonhole 66, the or each buttonhole 66 being adapted (s) to cooperate with a button 67 provided projecting on the hand 27 current.

En position ouverte du portillon 32 (en pointillés sur la figure 1), les lisses 59, 60 pendent librement, la réglette 65 étant désolidarisée de la barrière 25. L'utilisateur peut librement accéder au plancher 16, en s'aidant par exemple des mains 27 courantes lors de sa montée.In the open position of the gate 32 (in dotted lines on the figure 1 ), the smooth 59, 60 hang freely, the strip 65 being detached from the barrier 25. The user can freely access the floor 16, for example by using the 27 common hands during its rise.

Pour fermer le portillon 32, l'utilisateur saisit la réglette 65 qu'il vient emboîter sur la main 27 courante de la barrière 25, en insérant le bouton 67 dans la boutonnière 66 d'un mouvement de translation de haut en bas (pour éviter tout retrait intempestif de la réglette 65).To close the gate 32, the user grasps the strip 65 that fits on the current hand 27 of the barrier 25, by inserting the button 67 in the buttonhole 66 in a translation movement from top to bottom (to avoid any inadvertent withdrawal of the strip 65 ).

En position fermée du portillon 32, les lisses 59, 60 s'étendent ainsi transversalement entre les barrières 24, 25, elles-mêmes en position déployée, la réglette 65 étant emboîtée sur la main 27 courante avec le bouton 67 logé dans la boutonnière 66. In the closed position of the door 32, the rails 59, 60 thus extend transversely between the barriers 24, 25, themselves in the deployed position, the strip 65 being fitted on the hand 27 with the button 67 housed in the buttonhole 66 .

Cette réalisation du portillon 32 est avantageuse à plusieurs titres.This embodiment of the gate 32 is advantageous in several ways.

Premièrement, le caractère semi-rigide des lisses 59, 60 permet, au contraire des réalisations dans lesquelles les lisses sont rigides, qui nécessitent des ajustages précis, de simplifier la fabrication.Firstly, the semi-rigid character of the rails 59, 60 makes it possible, in contrast to embodiments in which the rails are rigid, which require precise adjustments, to simplify manufacture.

Deuxièmement, le caractère semi-rigide des lisses 59, 60 assure, à la différence des lisses souples telles que les chaînes seules, un meilleur maintien de l'utilisateur en danger de chute vers l'avant.Secondly, the semi-rigid nature of the rails 59, 60 ensures, unlike soft heddles such as chains alone, a better maintenance of the user in danger of falling forward.

Troisièmement, l'accrochage et le décrochage de la réglette 65 (et donc du portillon 32) au moyen de la réglette 65 assurant la liaison entre les lisses 59, 56 peut être réalisée d'une main, au bénéfice de l'ergonomie et de la simplicité d'utilisation.Third, the hooking and unhooking of the strip 65 (and therefore of the door 32 ) by means of the strip 65 connecting the stringers 59, 56 can be made with one hand, for the benefit of the ergonomics and the simplicity of use.

Claims (7)

  1. Step (1) comprising:
    - a front plane (2) comprising a pair of front uprights (3) and at least one step (4) connecting the front uprights (3),
    - a rear plane (9) mounted in articulated fashion on the front plane (2) and comprising a pair of rear uprights (10) and at least one bar (11) connecting the rear uprights (10), the rear uprights (10) ending in ends (12) which, with ends (5) of the front uprights (3), define a standing plane (P) for the step (1) in an unfolded position of the latter, in which the rear plane (9) forms an angle with the front plane (2),
    - a pair of retractable rear wheels (33) mounted so as to be able to move with respect to the rear plane (9) between a retracted position in which the rear wheels (33) extend above the standing plane (P) and a deployed position in which the rear wheels (33) project downwards beyond the standing plane (P), each rear wheel (33) being urged towards its deployed position by a spring (34),
    - a front undercarriage (39) comprising a crosspiece (41) which is mounted so as to be able to pivot between the front uprights (3) and on which is attached at least one retractable front wheel (40), the front undercarriage (39) being mounted so as to be able to move with respect to the front plane (2) between a retracted position in which the at least one front wheel (40) extends above the standing plane (P) and a deployed position in which the at least one front wheel (40) projects downwards beyond the standing plane (P),
    - a mechanism (46) for activating the at least one front wheel (40),
    this step (1) being characterized in that the activating mechanism (46) comprises at least one actuating lever (47) mounted in articulated fashion on a front upright (3) and a rod (48) running along the front upright (3) and coupling the lever (47) to the front undercarriage (39).
  2. Step (1) according to Claim 1, characterized in that the lever (47) takes the form of a part having a U-shaped cross section, placed astride the upright (3).
  3. Step (1) according to Claim 2, characterized in that the lever (47) has a front pressing face (50) and two lateral faces (51, 52) which surround the upright (3) and by means of which the lever (47) is attached in rotation on the upright (3).
  4. Step (1) according to Claim 3, characterized in that one lateral face (52) of the lever (47) has an end portion to which an upper end (55) of the rod (48) is attached in a pivoting connection.
  5. Step (1) according to one of the preceding claims, characterized in that the crosspiece (41) is provided with a right-angle return (43) to which is attached, in a pivoting connection, a lower end (57) of the rod (48).
  6. Step (1) according to one of the preceding claims, characterized in that it comprises a guide (58) which is attached to the front upright (3) and in which the rod (48) is mounted so as to be able to slide.
  7. Step (1) according to one of the preceding claims, characterized in that each rear wheel (33) is attached to a rear upright (10) by means of a U-shaped attachment plate (35), comprising a core (36) and two arms (37) projecting transversely, the wheel (33) being mounted on the lower end of a support shaft (38) which is slotted into the ends of the arms (37) so as to be able to slide, with interposition of the spring (34).
EP14168496.9A 2013-05-21 2014-05-15 Stepladder with retractable wheels, a front wheel of which being tiltably mounted and hand-operated Active EP2806097B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1354521A FR3005986B1 (en) 2013-05-21 2013-05-21 FOOTBOARD HAVING RECOVERABLE WHEELS, INCLUDING A FRONT WHEEL TILT UP WITH MANUAL CONTROL

Publications (2)

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EP2806097A1 EP2806097A1 (en) 2014-11-26
EP2806097B1 true EP2806097B1 (en) 2016-07-06

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EP14168496.9A Active EP2806097B1 (en) 2013-05-21 2014-05-15 Stepladder with retractable wheels, a front wheel of which being tiltably mounted and hand-operated

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EP (1) EP2806097B1 (en)
FR (1) FR3005986B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201405841D0 (en) 2014-04-01 2014-05-14 Romax Technology Ltd Bearing Grease
FR3111940B1 (en) 2020-06-29 2022-06-24 Cdh Group GATE LEAF FOR WORK PLATFORM AT HEIGHT AND WORK PLATFORM COMPRISING SUCH A GATE LEAF
FR3112570B1 (en) 2020-07-15 2022-09-09 Cdh Group DEVICE FOR WORKING AT HEIGHT WITH ARTICULATED GUARDRAIL AND AUTOMATIC GATE
FR3113695B1 (en) 2020-08-27 2022-10-07 Cdh Group DEVICE FOR WORKING AT HEIGHT WITH ARTICULATED GUARDRAIL AND MEANS OF MAINTAINING IN FOLDED POSITION

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7411743U (en) * 1974-09-19 Hasenbach L Roller fitting for ladders or ladder stands
DE522207C (en) * 1931-04-07 Franz Fenninger Locking device for mobile stepladders
DE3804306A1 (en) * 1988-02-09 1989-08-17 Herve Rousselot Stepladder
CA2128300A1 (en) * 1993-08-12 1995-02-13 Roy B. Bendickson Ladder system including a caster bracket and method of forming
US6026931A (en) * 1998-10-26 2000-02-22 Emerson Electric Co. Support frame assembly
US6688426B1 (en) * 2002-03-02 2004-02-10 Harry Mikros Wheel extension and lift device for ladders

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FR3005986A1 (en) 2014-11-28
FR3005986B1 (en) 2015-06-05
EP2806097A1 (en) 2014-11-26

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