EP2818625B1 - Step with retractable wheels with control by railing - Google Patents

Step with retractable wheels with control by railing Download PDF

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Publication number
EP2818625B1
EP2818625B1 EP14171331.3A EP14171331A EP2818625B1 EP 2818625 B1 EP2818625 B1 EP 2818625B1 EP 14171331 A EP14171331 A EP 14171331A EP 2818625 B1 EP2818625 B1 EP 2818625B1
Authority
EP
European Patent Office
Prior art keywords
plane
lever
uprights
barrier
undercarriage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14171331.3A
Other languages
German (de)
French (fr)
Other versions
EP2818625A1 (en
Inventor
Patrick Lachant
Olivier Morel
Georges CHALAIN
Jean-Paul Benard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CDH Group SAS
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CDH Group SAS
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Filing date
Publication date
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Publication of EP2818625A1 publication Critical patent/EP2818625A1/en
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Publication of EP2818625B1 publication Critical patent/EP2818625B1/en
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Classifications

    • 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
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/18—Devices for preventing persons from falling
    • E06C7/181—Additional gripping devices, e.g. handrails
    • E06C7/182—Additional gripping devices, e.g. handrails situated at the top of the ladder
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/18—Devices for preventing persons from falling
    • E06C7/181—Additional gripping devices, e.g. handrails
    • E06C7/183—Additional gripping devices, e.g. handrails situated along the ladder
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/42—Ladder feet; Supports therefor
    • E06C7/46—Non-skid equipment

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 normal 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, which allows the maneuvering and rolling.
  • the US patent US 6,026,931 provides a structure in which the rear portion of the step is provided with spring-mounted rear wheels, while the front portion of the step is provided with a pair of axially mounted front wheels. 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 of a weight (in practice, the weight of the user) on the step.
  • a weight in practice, the weight of the user
  • 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.
  • Actuation of the lever by folding at least one of the railing barriers causes the deployment of the front axle, which allows to temporarily place the step in a rolling configuration for easy movement, guardrails folded.
  • the barrier (s) is (are) redeployed (s)
  • the front axle 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 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 grooved upper surface 7 to promote the attachment of the shoes of the user, and is fixed to the uprights 3 by means of jumpers 8 made of plastic riveted to the uprights 3.
  • 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 a rectangular section. At lower ends 12, the rear uprights 10 are provided with pads 6 slip.
  • the step 1 is unfolded (configuration illustrated on the Figures 1 to 7 and 10 to 14 )
  • the rear plane 9 forms an angle with the plane 2 before, and the ends 12 lower amounts rear 10 form, with the 5 lower ends of the uprights 3 before a laying plane P (dotted line) for one step, corresponding to an ideally flat ground S which would support the footboard 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 thereof.
  • 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 figures 1 , 2 , 4 , 10 , 11 , 12, 13 ) in which each barrier 24, 25 extends substantially perpendicularly to the front plane 2 , and a folded position (illustrated in FIGS. figures 5 , 6 , 7 , 9 , 11 , 14 ) in which each barrier 24, 25 extends substantially parallel to the front plane 2 , in the vicinity of the latter.
  • 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, vertical in the deployed position of the barrier 24, 25 and 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 .
  • Flexible sleeves 32 are fitted to the ends of the handrails 27 to stiffen the strength of the barriers 24, 25 and cushion the shocks during their deployment.
  • the guardrail may further comprise a movable gate (not shown), mounted between the barriers (for example in the form of a chain or a bar) to retain the unbalanced user towards the front of the step, while defining the workspace so that only one user can move with ease on the floor 16.
  • a movable gate (not shown), mounted between the barriers (for example in the form of a chain or a bar) to retain the unbalanced user towards the front of the step, while defining the workspace so that only one user can move with ease on the floor 16.
  • 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 8 .
  • 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 8 ) 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 at least one wheel 40 - and in this case a pair of wheels 40 - before retractable (as shown in FIG. figure 1 ).
  • the forward rolling gear 39 is movably mounted relative to the front plane 2 between a retracted position in which the front wheels 40 extend above the laying plane P (FIG. figure 2 ), and an extended position in which the front wheels 40 protrude from the plane P of laying down ( figure 7 ).
  • the undercarriage 39 comprises a cross profile 41 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 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 Central Section 42 .
  • 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 transom 41.
  • each front wheel 40 is freely pivotable both around its axis of travel and around its shaft 44 support.
  • the step 1 further comprises a mechanism 46 for actuating the train 39 before, to control are deployment (in anticipation of the movement 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 fixing of the lever 47 is for example carried out by means of a pivot 49 (such as a bolt) which forms the axis of rotation of the lever 47.
  • the lever 47 is mounted in the vicinity of the articulation of one of the barriers (in this case the barrier 25 right). More specifically, the lever 47 is mounted on the upright 3 to the right of a portion of the barrier 25, in this case to the right of the ramp 26, so that by folding the barrier 25 the ramp 26 abuts against the lever 47 to switch, as will be explained below.
  • the lever 47 is in the form of a U-shaped section (metal or plastic) mounted on the upright 3.
  • the lever 47 has a front wall 50 , of which an end portion opposite the pivot 49 s extends to the right of the ramp 26 of the barrier 25, and two side walls, namely an outer lateral wall 51 and an inner lateral wall 52 , which frame the upright 3 and through which the lever 47 is fixed on the upright 3.
  • One of the sidewalls (in this case the inner wall 52 ) has an end portion 53 protruding from the upright 3 away from the front wall 50 towards the inside of the step 1.
  • this portion 53 end is made a bore 54 in which is introduced a folded upper end 55 of the rod 48 (which is in this case in the form of a metal rod with a 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 an end 57 is inserted. lower folded of the rod 48 to achieve the pivot connection between the rod 48 and the cross 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 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 7 ) where it rests on the ground S by its wheels 33, 40, the laying plane P being raised relative to the ground S.
  • 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 front train 39 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 of the rolling train 39 before both sides of the step 1 .
  • a crossbar can connect the levers to synchronize their tilting, in the manner of a panic bar fire door.
  • the rear plane 9 is shorter than the front plane 2 , so that when the step 1 is folded, the uprights 3 forward exceed rear uprights 10 .
  • the roller 39 front end is deployed and exceeds both the 5 lower ends of the uprights 3 before and ends 12 below the struts 10 back, so that it is possible, while keeping the footrest 1 folded, that is to say that the rear plane 9 is secured to the front plane 2 (for example by means of a strap 59, as illustrated, or using an integrated fixing means, such as a hook, mounted on the rear plane 9 , cooperating with a fastener mounted on the front plane 2 ), to maneuver it by rolling on its wheels 40 before.
  • the shafts 44 of the front wheels are perpendicular to the ground S, so that it is possible to rotate the wheels 40 and thus guide at will the step 1.
  • the operating lever 47 is in the form of a wafer (preferably metal, for reasons of rigidity and robustness), a front section 60 of which projects from the plane 2 front, and a rear section 61 , opposite the front section 60 and separated therefrom by the pivot 49, is provided with a bore 54 for the upper end 55 of the rod 48.
  • the lever 47 extends substantially in line with the rail 26 of one of the barriers (in this case the barrier 25, right), and the front section 60 terminates in a beveled end 62 free.
  • This embodiment is not intended for manual operation of the lever 47, but it is not forbidden for the user to maneuver the lever 47 directly without folding the barrier 25.
  • levers 47 can be provided (one on each amount 3 before), to allow a distribution of efforts.
  • Each lever 47 is in this case tilted by a barrier 25, 26.
  • the simultaneous pivoting of the barriers 25, 26 thus causes the simultaneous tilting of the levers 47, which act in concert on the front gear 39 .
  • the hole 68 is pierced in a lug 69 formed protruding on the lever 47, in a lower portion thereof.
  • the tab 69 is folded substantially square to the outer 51 of the lever 47.
  • the rod 65 pivots around its front end 66 housed in the hole 68 ( figure 14 ).
  • the handle 64 is provided with a portion 70 of upper end pierced with a hole in which is housed the rear end 67 .
  • the lever 47 (and thus the front gear 39 ) can be maneuvered by manual action on the remote handle 64 when the barrier 25 is in its extended position, as shown in FIG. figure 13 , on which arrows indicate the rotational movement of the handle 64 and the lever 47.
  • the action on the handle 64 can be performed as long as the barrier 25 is deployed, and that the user is descended from the step 1, c ' that is to say that it is free of charge.
  • the pivoting of the handle 64 (in this case by manual tightening, in the manner of a bicycle brake) pushes the rod 65 towards the lever 47, causing the tilting thereof around its pivot 49, and therefore the tilting, via the rod 48, of the train 39 before.
  • Folding barrier 25 has the same effects as in the first embodiment.
  • the ramp 26 presses on the front wall 50 of the lever 47 and, by tilting thereof in the folded position of the barrier 25, causes the tilting of the front gear 39 towards its extended position allowing the running of the step 1.
  • This action causes also the tilting of the handle 64 via the rod 65.
  • the return 63 is rendered inactive, the handle 64 being kept tilted via the rod 65 ( figure 14 ).
  • This configuration improves the ergonomics of the step 1 relative to the first embodiment, insofar as the user can, by holding the step 1 by the handrails 27, both deploy the train 39 before and move the step 1 to the desired position, without having to bend or reach for the lever 47.
  • the step 1 which has just been described provides the following advantages in particular.
  • the deployment of the front rolling train 29 can be achieved without difficulty, to the benefit of ergonomics for the user.
  • the running of the step 1 can be achieved without difficulty when the step 1 is folded (with a maintenance of the rear plane 9 against the front plane 2 ) and the barriers 24, 25 of the railing are folded, thanks to the deployment of the train 39 before.
  • lever 47 is provided in the embodiments described, it is possible to mount one on each upright 3, so as to balance the efforts.
  • Each lever can be actuated by a respective barrier, or the two levers can be coupled via a force bar, in the manner of an anti-panic bar.
  • the lever 47 as described above (whatever the embodiment) is mounted to the right of the ramp 26 to avoid structural modifications of the barrier 25.
  • this assembly could be uncomfortable (requiring the user to extend the arm height to reach the lever 47 ), or impractical, the lever 47 proving out of reach.
  • This piece is for example in the form of a tab or tube secured to a bar connecting the ramp 26 to the lower section 28 parallel to the upright 3, in the vicinity of the pivots 29.

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 normale 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 normal 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, which allows the maneuvering and rolling.

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 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 provides a structure in which the rear portion of the step is provided with spring-mounted rear wheels, while the front portion of the step is provided with a pair of axially mounted front wheels. 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 of a weight (in practice, the weight of the user) on the step.

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. Le document US 2005/029048 A1 décrit un marche pied selon le préambule de la revendication 1.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. The document US 2005/029048 A1 describes a step according to the preamble of claim 1.

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 comprenant :

  • un plan avant comprenant une paire de montants avant et au moins une marche reliant les montants avant,
  • un garde-corps monté sur le plan avant, ce garde-corps comprenant une paire de barrières latérales, chacune montée articulée sur un montant avant entre une position déployée dans laquelle chaque barrière s'étend sensiblement perpendiculairement au plan avant, et une position rabattue dans laquelle chaque barrière s'étend sensiblement parallèlement au plan 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 équipé d'au moins une roue avant escamotable, le train roulant avant étant monté 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 du train roulant avant, qui comprend au moins un levier de manoeuvre monté articulé sur un montant avant au droit d'une partie mobile d'une barrière, et une tringle couplant le levier au train roulant avant, en sorte qu'en position rabattue la barrière place, via le levier, le train roulant avant dans sa position déployée.
For this purpose, it is proposed a step comprising:
  • a front plane comprising a pair of front uprights and at least one step connecting the front uprights,
  • a railing mounted on the front plane, this railing comprising a pair of lateral barriers, each mounted articulated on a front post between an extended position in which each barrier extends substantially perpendicularly to the front plane, and a folded position in each barrier extends substantially parallel to the front plane,
  • 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 front-wheel drive train equipped with at least one retractable front wheel, the front undercarriage being movably mounted relative to the front plane between a retracted position in which the front wheel extends above the laying plane, and an extended position in which the front wheel protrudes from the laying plane downwards,
  • an actuating mechanism of the front undercarriage, which comprises at least one operating lever pivotally mounted on a front post in line with a movable part of a barrier, and a rod coupling the lever to the front undercarriage, so that in the folded down position the barrier places, via the lever, the running gear forward in its deployed position.

L'actionnement du levier par repliement de l'une au moins des barrières de garde-corps provoque le déploiement du train avant, ce qui permet de placer temporairement le marchepied dans une configuration de roulage permettant son déplacement aisé, garde-corps repliés. Dès lors que la (ou les) barrière(s) est (sont) redéployé(s), le train 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.Actuation of the lever by folding at least one of the railing barriers causes the deployment of the front axle, which allows to temporarily place the step in a rolling configuration for easy movement, guardrails folded. As soon as the barrier (s) is (are) redeployed (s), the front axle 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 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 en rotation sur le montant ;
  • une paroi latérale du levier présente une portion d'extrémité à laquelle une extrémité supérieure de la tringle est fixée en liaison pivot ;
  • le train roulant avant comprend une traverse montée basculante entre les montants avant et sur laquelle est fixée la ou chaque roue avant ;
  • la traverse est munie d'un retour en équerre auquel une extrémité inférieure de la tringle est fixée en liaison pivot ;
  • le levier se présente sous forme d'une plaquette dont une section avant s'étend en saillie par rapport au plan avant, cette section avant ayant une extrémité libre biseautée pour coopérer avec une rampe de la barrière en position rabattue de celle-ci ;
  • le mécanisme d'actionnement comprend un renvoi comprenant une poignée de manoeuvre déportée montée sur la barrière et une tige reliant la poignée de manoeuvre au levier ;
  • la poignée déportée est montée articulée sur une main courante de la barrière située du côté du levier ;
  • le levier est pourvu d'une patte en saillie pourvue d'un trou dans lequel est logée une extrémité avant coudée de la tige ;
  • en position repliée du marchepied et en position rabattue des barrières, le train roulant avant dépasse des extrémités des montants avant et des montants arrière, pour permettre le roulage du marchepied sur le train roulant avant.
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 upright and by which the lever is fixed in rotation on the upright;
  • a side wall of the lever has an end portion to which an upper end of the rod is fixed in pivot connection;
  • the undercarriage comprises a tilting cross member between the front uprights and on which is fixed the or each front wheel;
  • the cross member is provided with a right angle return to which a lower end of the rod is fixed in pivot connection;
  • the lever is in the form of a plate having a front section projecting from the front plane, this front section having a free end beveled to cooperate with a ramp of the barrier in the folded position thereof;
  • the actuating mechanism comprises a return comprising a remote operating handle mounted on the barrier and a rod connecting the operating handle to the lever;
  • the remote handle is articulated on a handrail of the barrier located on the lever side;
  • the lever is provided with a projecting lug provided with a hole in which is housed a bent front end of the rod;
  • in the folded position of the step and in the folded down position of the barriers, the front running gear protrudes from the ends of the front uprights and rear uprights, to allow the running of the step on the front undercarriage.

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 avec une commande par rotation d'une barrière de garde-corps, selon un premier mode de réalisation, dans une position déployée du garde-corps ; en médaillon est illustré un détail d'une roue arrière montée sur ressort sur le plan arrière du marchepied ;
  • la figure 2 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 guide de tringle et le train roulant avant ;
  • la figure 3 est une vue de détail en coupe illustrant le levier de manoeuvre du marchepied montré sur la figure 2, selon le plan de coupe III-III ;
  • la figure 4 est une vue de détail en perspective du marchepied des figures précédentes, selon un autre angle de vue, barrières de garde-corps en position déployée ;
  • la figure 5 est une vue similaire à la figure 4, où les barrières de garde-corps sont en position rabattue ;
  • la figure 6 est une vue similaire à la figure 1, où les barrières de garde-corps sont en position rabattue ;
  • la figure 7 est une vue similaire à la figure 2, où les barrières de garde-corps sont en position rabattue ; en médaillons sont illustrés, à échelle agrandie, des détails structurels du marchepied, respectivement, de haut en bas, le levier de manoeuvre du train avant et le train roulant avant ;
  • la figure 8 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 ;
  • la figure 9 est une vue de côté montrant le marchepied replié et maintenu dans cette configuration par une sangle, le marchepied reposant sur le sol par le train avant déployé pour permettre son déplacement par roulage ;
  • la figure 10 est une vue similaire à la figure 4, montrant le marchepied selon un deuxième mode de réalisation, les barrières de garde-corps étant montrées en position déployée ;
  • la figure 11 est une vue similaire à la figure 4, montrant le marchepied selon le deuxième mode de réalisation avec les barrières de garde-corps en position rabattue ;
  • la figure 12 est une vue similaire à la figure 4, montrant le marchepied selon un troisième mode de réalisation dans lequel le mécanisme d'actionnement du train avant comprend un renvoi sur une poignée de manoeuvre montée sur une main courante de l'une des barrières de garde-corps, lesquelles sont ici montrées en position déployée ;
  • la figure 13 est une vue similaire à la figure 12, montrant le marchepied selon le troisième mode de réalisation avec les barrières de garde-corps en position déployée et la poignée de manoeuvre actionnée de manière à déployer le train avant roulant ;
  • la figure 14 est une vue similaire (quoique élargie) aux figures 12 et 13, montrant le marchepied selon le troisième mode de réalisation avec les barrières de garde-corps en position rabattue.
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 with a rotation control of a railing barrier, according to a first embodiment, in an extended position of the guardrail; inset is a detail of a spring-mounted rear wheel on the back plane of the footboard;
  • the figure 2 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 rod guide and the front running gear;
  • the figure 3 is a detailed sectional view illustrating the operating lever of the step shown on the figure 2 according to section plane III-III;
  • the figure 4 is a detailed perspective view of the step of the previous figures, according to another angle of view, guardrail barriers in the deployed position;
  • the figure 5 is a view similar to the figure 4 , where the railing barriers are in the folded position;
  • the figure 6 is a view similar to the figure 1 , where the railing barriers are in the folded position;
  • the figure 7 is a view similar to the figure 2 , where the railing barriers are in the folded position; in medallions are illustrated, on an enlarged scale, structural details of the step, respectively, from top to bottom, the operating lever of the nose gear and the front running gear;
  • the figure 8 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;
  • the figure 9 is a side view showing the step folded and maintained in this configuration by a strap, the step resting on the ground by the front axle deployed to allow its movement by rolling;
  • the figure 10 is a view similar to the figure 4 showing the step according to a second embodiment, the guardrail barriers being shown in the deployed position;
  • the figure 11 is a view similar to the figure 4 , showing the step according to the second embodiment with the railing barriers in the folded position;
  • the figure 12 is a view similar to the figure 4 , showing the step according to a third embodiment in which the actuating mechanism of the front axle comprises a reference on an operating handle mounted on a handrail of one of the railing barriers, which are here shown in the deployed position;
  • the figure 13 is a view similar to the figure 12 showing the step according to the third embodiment with the railing barriers in the deployed position and the operating handle actuated to deploy the front wheel rolling;
  • the figure 14 is a similar (albeit enlarged) view of Figures 12 and 13 , showing the step according to the third embodiment with the railing barriers in the folded 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 une surface 7 supérieure rainurée pour favoriser l'accroche des souliers de l'utilisateur, et est fixée aux montants 3 par l'intermédiaire de cavaliers 8 en matière plastique rivetés aux montants 3. As illustrated on the figure 1 , the step 4 is formed of a folded cut sheet. The step 4 has a grooved upper surface 7 to promote the attachment of the shoes of the user, and is fixed to the uprights 3 by means of jumpers 8 made of plastic riveted to the uprights 3.

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 1 à 7 et 10 à 14), 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 example illustrated, the rear uprights 10 are, like before uprights 3, formed of metal profiles (e.g. aluminum or aluminum alloy), in particular 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 on the Figures 1 to 7 and 10 to 14 ), the rear plane 9 forms an angle with the plane 2 before, and the ends 12 lower amounts rear 10 form, with the 5 lower ends of the uprights 3 before a laying plane P (dotted line) for one step, corresponding to an ideally flat ground S which would support the footboard 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 thereof. 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 1, 2, 4, 10, 11, 12, 13) dans laquelle chaque barrière 24, 25 s'étend sensiblement perpendiculairement au plan 2 avant, et une position rabattue (illustrée sur les figures 5, 6, 7, 9, 11, 14) dans laquelle chaque barrière 24, 25 s'étend sensiblement parallèlement plan 2 avant, au voisinage de celui-ci. 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, 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.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 figures 1 , 2 , 4 , 10 , 11 , 12, 13 ) in which each barrier 24, 25 extends substantially perpendicularly to the front plane 2 , and a folded position (illustrated in FIGS. figures 5 , 6 , 7 , 9 , 11 , 14 ) in which each barrier 24, 25 extends substantially parallel to the front plane 2 , in the vicinity of the latter. 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, vertical in the deployed position of the barrier 24, 25 and 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 .

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 (cf. notamment figure 1), tandis que le pivotement des verrous 31 permet de rabattre les barrières 24, 25 (cf. notamment figure 5).Latches 31, for example in the form of wires 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 (see in particular figure 1 ), while the pivoting of the latches 31 makes it possible to fold down the barriers 24, 25 (see in particular figure 5 ).

Des manchons 32 souples sont emmanchés aux extrémités des mains courantes 27 pour rigidifier la tenue des barrières 24, 25 et amortir les chocs lors de leur déploiement.Flexible sleeves 32 are fitted to the ends of the handrails 27 to stiffen the strength of the barriers 24, 25 and cushion the shocks during their deployment.

Le garde-corps peut en outre comprend un portillon mobile (non représenté), monté entre les barrières (par exemple sous forme d'une chaîne ou d'une barre) pour 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. The guardrail may further comprise a movable gate (not shown), mounted between the barriers (for example in the form of a chain or a bar) to retain the unbalanced user towards the front of the step, while defining the workspace so that only one user can move with ease on the floor 16.

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 8. 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 8) 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 8 . 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 8 ) 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 8,
  • 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 8.
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 8 ,
  • 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 8 .

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'au moins une roue 40 - et en l'espèce d'une paire de roues 40 - avant escamotable (comme illustré sur la figure 1).The step 1 further comprises a train 39 rolling forward, equipped with at least one wheel 40 - and in this case a pair of wheels 40 - before retractable (as shown in FIG. figure 1 ).

Le train 39 roulant avant est monté mobile par rapport au plan 2 avant entre une position rétractée dans laquelle les roues 40 avant s'étendent au-dessus du plan P de pose (figure 2), et une position déployée dans laquelle les roues 40 avant dépassent du plan P de pose vers le bas (figure 7).The forward rolling gear 39 is movably mounted relative to the front plane 2 between a retracted position in which the front wheels 40 extend above the laying plane P (FIG. figure 2 ), and an extended position in which the front wheels 40 protrude from the plane P of laying down ( figure 7 ).

Selon un mode de réalisation préféré illustré sur les figures, le train 39 roulant comprend une traverse 41 à 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 a preferred embodiment illustrated in the Figures, the undercarriage 39 comprises a cross profile 41 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).

Comme on le voit sur la figure 1 (où l'une des roues est masquée par le montant 3 avant situé à droite), les 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.As we see on the figure 1 (Where one of the wheels is masked by the front post 3 located to the right), the 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 Central Section 42 .

Comme on le voit bien sur les figures 2 et 7, 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, 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 2 and 7 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 transom 41. Like the rear wheels 33 , each front wheel 40 is freely pivotable both around its axis of travel and around its shaft 44 support.

Ainsi que représenté notamment sur les figures, le marchepied 1 comprend en outre un mécanisme 46 d'actionnement du train 39 avant, pour commander sont déploiement (en prévision du déplacement du marchepied 1) ou à l'inverse lui permettre de se rétracter.As shown in particular in the figures, the step 1 further comprises a mechanism 46 for actuating the train 39 before, to control are deployment (in anticipation of the movement 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. La fixation du levier 47 est par exemple réalisée au moyen d'un pivot 49 (tel qu'un boulon) qui forme l'axe de rotation du levier 47. 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 fixing of the lever 47 is for example carried out by means of a pivot 49 (such as a bolt) which forms the axis of rotation of the lever 47.

Comme on le voit sur les figures, le levier 47 est monté au voisinage de l'articulation de l'une des barrières (en l'espèce la barrière 25 droite). Plus précisément, le levier 47 est monté sur le montant 3 au droit d'une partie de la barrière 25, en l'espèce au droit de la rampe 26, de telle sorte qu'en repliant la barrière 25 la rampe 26 vienne buter contre le levier 47 pour le basculer, comme cela sera expliqué ci-après.As seen in the figures, the lever 47 is mounted in the vicinity of the articulation of one of the barriers (in this case the barrier 25 right). More specifically, the lever 47 is mounted on the upright 3 to the right of a portion of the barrier 25, in this case to the right of the ramp 26, so that by folding the barrier 25 the ramp 26 abuts against the lever 47 to switch, as will be explained below.

Selon un premier mode de réalisation illustré sur les figures 1 à 7, le levier 47 se présente sous forme d'une pièce (métallique ou plastique) à section en U, montée à cheval sur le montant 3. Le levier 47 présente une paroi 50 frontale, dont une partie d'extrémité opposée au pivot 49 s'étend au droit de la rampe 26 de la barrière 25, 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 first embodiment illustrated on the Figures 1 to 7 , the lever 47 is in the form of a U-shaped section (metal or plastic) mounted on the upright 3. The lever 47 has a front wall 50 , of which an end portion opposite the pivot 49 s extends to the right of the ramp 26 of the barrier 25, and two side walls, namely an outer lateral wall 51 and an inner lateral wall 52 , which frame the upright 3 and through which the lever 47 is fixed on the upright 3.

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.One of the sidewalls (in this case the inner wall 52 ) has an end portion 53 protruding from the upright 3 away from the front wall 50 towards the inside of the step 1. In this portion 53 end is made a bore 54 in which is introduced a folded upper end 55 of the rod 48 (which is in this case in the form of a metal rod with a 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 an end 57 is inserted. lower folded of the rod 48 to achieve the pivot connection between the rod 48 and the cross 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 peut actionner le levier 47 :

  • soit directement en appuyant sur la paroi 50 frontale jusqu'à ce que celle-ci vienne buter contre le montant 3 avant,
  • soit indirectement via la barrière 25, en rabattant celle-ci, la rampe 26 venant appuyer sur la paroi 50 frontale.
When the user wishes to move the step 1 from which he descended, he can operate the lever 47:
  • or directly by pressing on the front wall 50 until it abuts against the upright 3 before,
  • or indirectly via the barrier 25, by folding it, the ramp 26 coming to press on the front wall 50 .

Dans les deux cas, le levier 47, basculant autour de son pivot 49, fait à son tour basculer, via la tringle 48, le train 39 roulant avant vers sa position déployée.In both cases, the lever 47, swinging around its pivot 49, in turn rotates, via the rod 48, the train 39 rolling forward to its deployed position.

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 7) où il repose sur le sol S par ses roues 33, 40, le plan P de pose étant surélevé par rapport au sol S. 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 7 ) 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 ou en maintenant la (ou les) barrière(s) rabattue(s), de déplacer le marchepied 1 dans sa configuration de roulage jusqu'à la position désirée, puis de relâcher le levier 47 ou de redéployer la (ou les) barrière(s) 25 (et 26). Les roues 33 arrière demeureront en position déployée (les montants 10 arrière demeurant ainsi surélevés par rapport au sol S), mais les roues 40 avant retrouveront par gravité leur position rétractée cependant que les montants 3 avant reprendront contact avec le sol S). Cette configuration intermédiaire (roues 33 arrières déployées, roues 40 avant rétractées) 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 or maintaining the (or) barrier (s) folded (s), to move the step 1 in its running configuration to the desired position , then release the lever 47 or redeploy the (or) barrier (s) 25 (and 26). Rear wheels 33 remain in the deployed position (amounts remaining 10 back and raised above ground S), but the wheels 40 before they find gravity retracted position, however, that the front pillars 3 will contact the ground S ). This intermediate configuration (rear wheels 33 deployed, wheels 40 before retracted) 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 Unexpected 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 du train 39 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 front train 39 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 des deux côtés du marchepied 1. 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 of the rolling train 39 before both sides of the step 1 . Alternatively, a crossbar can connect the levers to synchronize their tilting, in the manner of a panic bar fire door.

Comme on le voit sur la figure 9, le plan 9 arrière est plus court que le plan 2 avant, en sorte que, lorsque le marchepied 1 est replié, les montants 3 avant dépassent des montants 10 arrière. Dans la configuration repliée du marchepied 1, avec les barrières 24, 25 rabattues, le train 39 roulant avant est déployé et dépasse à la fois des extrémités 5 inférieures des montants 3 avant et des extrémités 12 inférieures des montants 10 arrière, de sorte qu'il est possible, tout en maintenant le marchepied 1 replié, c'est-à-dire que le plan 9 arrière est maintenu solidaire du plan 2 avant (par exemple au moyen d'une sangle 59, comme illustré, ou à l'aide d'un moyen de fixation intégré, tel qu'un crochet, monté sur le plan 9 arrière, venant coopérer avec une attache montée sur le plan 2 avant), de manoeuvrer celui-ci en le faisant rouler sur ses roues 40 avant. On notera que, lorsque le marchepied est correctement incliné (ce qui correspond, dans l'exemple illustré, à l'horizontalité de la tablette 21), les arbres 44 des roues avant sont perpendiculaires au sol S, de sorte qu'il est possible de faire tourner les roues 40 et ainsi d'orienter à loisir le marchepied 1. As we see on the figure 9 , the rear plane 9 is shorter than the front plane 2 , so that when the step 1 is folded, the uprights 3 forward exceed rear uprights 10 . In the folded configuration of the step 1 with the barriers 24, 25 folded back, the roller 39 front end is deployed and exceeds both the 5 lower ends of the uprights 3 before and ends 12 below the struts 10 back, so that it is possible, while keeping the footrest 1 folded, that is to say that the rear plane 9 is secured to the front plane 2 (for example by means of a strap 59, as illustrated, or using an integrated fixing means, such as a hook, mounted on the rear plane 9 , cooperating with a fastener mounted on the front plane 2 ), to maneuver it by rolling on its wheels 40 before. Note that when the step is correctly inclined (which corresponds, in the example shown, to the horizontality of the shelf 21), the shafts 44 of the front wheels are perpendicular to the ground S, so that it is possible to rotate the wheels 40 and thus guide at will the step 1.

On décrit à présent, en référence aux figures 10 et 11, un deuxième mode de réalisation du marchepied 1, qui ne diffère du premier que par la réalisation du levier 47, les autres caractéristiques étant conservées.Now described with reference to Figures 10 and 11 , a second embodiment of the step 1, which differs from the first by the embodiment of the lever 47, the other characteristics being retained.

Dans ce deuxième mode de réalisation en effet, le levier 47 de manoeuvre se présente sous forme d'une plaquette (de préférence métallique, pour des raisons de rigidité et de robustesse) dont une section 60 avant s'étend en saillie par rapport au plan 2 avant , et dont une section 61 arrière, opposée à la section avant 60 et séparée de celle-ci par le pivot 49, est pourvue d'un perçage 54 pour l'extrémité 55 supérieure de la tringle 48. In this second embodiment indeed, the operating lever 47 is in the form of a wafer (preferably metal, for reasons of rigidity and robustness), a front section 60 of which projects from the plane 2 front, and a rear section 61 , opposite the front section 60 and separated therefrom by the pivot 49, is provided with a bore 54 for the upper end 55 of the rod 48.

Comme on le voit sur les figures 10 et 11, le levier 47 s'étend sensiblement au droit de la rampe 26 de l'une des barrières (en l'espèce la barrière 25 droite), et la section 60 avant se termine par une extrémité 62 libre biseautée.As we see on the Figures 10 and 11 , The lever 47 extends substantially in line with the rail 26 of one of the barriers (in this case the barrier 25, right), and the front section 60 terminates in a beveled end 62 free.

Le pivotement de la barrière 25 vers sa position rabattue soulève, via l'extrémité 62 biseautée, le levier 47 qui à son tour fait basculer, via la tringle 48, le train 39 avant vers sa position déployée (figure 11).The pivoting of the barrier 25 towards its folded position raises, via the beveled end 62 , the lever 47 which in turn tilts, via the rod 48, the front gear 39 towards its deployed position ( figure 11 ).

Ce mode de réalisation n'est pas prévu pour une manoeuvre manuelle du levier 47, mais il n'est pas interdit à l'utilisateur de manoeuvrer le levier 47 directement sans rabattre la barrière 25. This embodiment is not intended for manual operation of the lever 47, but it is not forbidden for the user to maneuver the lever 47 directly without folding the barrier 25.

De même que précédemment évoqué, deux leviers 47 peuvent être prévus (un sur chaque montant 3 avant), pour permettre une répartition des efforts. Chaque levier 47 est dans ce cas basculé par une barrière 25, 26. Le pivotement simultané des barrières 25, 26 provoque ainsi le basculement simultané des leviers 47, qui agissent de concert sur le train 39 avant.As previously mentioned, two levers 47 can be provided (one on each amount 3 before), to allow a distribution of efforts. Each lever 47 is in this case tilted by a barrier 25, 26. The simultaneous pivoting of the barriers 25, 26 thus causes the simultaneous tilting of the levers 47, which act in concert on the front gear 39 .

On décrit à présent, en référence aux figures 12, 13 et 14, un troisième mode de réalisation du marchepied, qui diffère du premier par un mécanisme d'actionnement 46 modifié par :

  • ajout d'un renvoi 63 comprenant, d'une part, une poignée 64 déportée montée articulée sur la main 27 courante de la barrière 25 située du côté du levier 47 (c'est-à-dire, en l'espèce, la barrière 25 droite) et, d'autre part, une tige 65 de liaison de la poignée 64 au levier, cette tige 65 présentant une extrémité 66 avant coudée, située du côté du levier 47, et une extrémité 67 arrière opposée, située du côté de la poignée 64 ;
  • modification du levier 47 par adjonction d'un trou 68 dans lequel est introduite l'extrémité 66 avant de la tige 65.
Now described with reference to Figures 12, 13 and 14 , a third embodiment of the step, which differs from the first by an actuating mechanism 46 modified by:
  • addition of a reference 63 comprising, on the one hand, a remote handle 64 mounted articulated on the current hand 27 of the barrier 25 located on the side of the lever 47 (that is to say, in this case, the barrier 25 ) and, on the other hand, a rod 65 connecting the handle 64 to the lever, this rod 65 having a front end 66 bent, located on the side of the lever 47, and an opposite rear end 67 , located on the side of the lever. the handle 64;
  • modification of the lever 47 by adding a hole 68 into which the end 66 is inserted before the rod 65 .

Les autres caractéristiques du premier mode de réalisation sont conservées.The other features of the first embodiment are retained.

Comme on le voit sur les figures 12 à 14, le trou 68 est percé dans une patte 69 formée en saillie sur le levier 47, dans une portion inférieure de celle-ci. La patte 69 est repliée sensiblement à l'équerre par rapport à la 51 externe du levier 47. Lorsque la barrière 25 est rabattue, la tige 65 pivote autour de son extrémité avant 66 logée dans le trou 68 (figure 14). De même, la poignée 64 est munie d'une portion 70 d'extrémité supérieure percée d'un trou dans lequel est logée l'extrémité 67 arrière.As we see on the Figures 12 to 14 , the hole 68 is pierced in a lug 69 formed protruding on the lever 47, in a lower portion thereof. The tab 69 is folded substantially square to the outer 51 of the lever 47. When the barrier 25 is folded down, the rod 65 pivots around its front end 66 housed in the hole 68 ( figure 14 ). Similarly, the handle 64 is provided with a portion 70 of upper end pierced with a hole in which is housed the rear end 67 .

Il résulte de cette configuration que le levier 47 (et donc le train 39 avant) peut être manoeuvré par action manuelle sur la poignée 64 déportée lorsque la barrière 25 est dans sa position déployée, comme illustré sur la figure 13, sur laquelle des flèches indiquent le mouvement de rotation de la poignée 64 et du levier 47. L'action sur la poignée 64 peut être effectuée tant que la barrière 25 est déployée, et que l'utilisateur est descendu du marchepied 1, c'est-à-dire que celui-ci est libre de charge. Le pivotement de la poignée 64 (en l'espèce par serrage manuel, à la manière d'un frein de bicyclette) repousse la tige 65 en direction du levier 47, ce qui provoque le basculement de celui-ci autour de son pivot 49, et donc le basculement, via la tringle 48, du train 39 avant.As a result of this configuration, the lever 47 (and thus the front gear 39 ) can be maneuvered by manual action on the remote handle 64 when the barrier 25 is in its extended position, as shown in FIG. figure 13 , on which arrows indicate the rotational movement of the handle 64 and the lever 47. The action on the handle 64 can be performed as long as the barrier 25 is deployed, and that the user is descended from the step 1, c ' that is to say that it is free of charge. The pivoting of the handle 64 (in this case by manual tightening, in the manner of a bicycle brake) pushes the rod 65 towards the lever 47, causing the tilting thereof around its pivot 49, and therefore the tilting, via the rod 48, of the train 39 before.

Rabattre la barrière 25 a les mêmes effets que dans le premier mode de réalisation. La rampe 26 vient appuyer sur la paroi 50 frontale du levier 47 et, par basculement de celui-ci en position rabattue de la barrière 25, provoque le basculement du train 39 avant vers sa position déployée permettant le roulage du marchepied 1. Cette action provoque également le basculement de la poignée 64 via la tige 65. Ainsi, en position rabattue de la barrière 25, le renvoi 63 est rendu inactif, la poignée 64 étant maintenue basculée via la tige 65 (figure 14).Folding barrier 25 has the same effects as in the first embodiment. The ramp 26 presses on the front wall 50 of the lever 47 and, by tilting thereof in the folded position of the barrier 25, causes the tilting of the front gear 39 towards its extended position allowing the running of the step 1. This action causes also the tilting of the handle 64 via the rod 65. Thus, in the folded position of the barrier 25, the return 63 is rendered inactive, the handle 64 being kept tilted via the rod 65 ( figure 14 ).

Cette configuration améliore l'ergonomie du marchepied 1 par rapport au premier mode de réalisation, dans la mesure où l'utilisateur peut, en tenant le marchepied 1 par les mains courantes 27, à la fois déployer le train 39 avant et déplacer le marchepied 1 vers la position souhaitée, sans devoir se pencher ou tendre le bras pour atteindre le levier 47. This configuration improves the ergonomics of the step 1 relative to the first embodiment, insofar as the user can, by holding the step 1 by the handrails 27, both deploy the train 39 before and move the step 1 to the desired position, without having to bend or reach for the lever 47.

Le marchepied 1 qui vient d'être décrit procure notamment les avantages suivants.The step 1 which has just been described provides the following advantages in particular.

Premièrement, le déploiement du train 29 roulant avant peut être réalisé sans difficulté, au bénéfice de l'ergonomie pour l'utilisateur.First, the deployment of the front rolling train 29 can be achieved without difficulty, to the benefit of ergonomics for the user.

Deuxièmement, grâce au déploiement automatique du train 29 roulant en position rabattue des barrières 24, 25, il suffit à l'utilisateur de rabattre celles-ci pour pouvoir ensuite déplacer le marchepied 1, sans devoir exercer un quelconque effort sur le levier 47 (ou la poignée 64 dans le cas du troisième mode de réalisation). Il en résulte une moindre fatigue pour l'utilisateur, et une meilleure liberté de mouvement.Secondly, thanks to the automatic deployment of the rolling train 29 in the folded position of the barriers 24, 25, it suffices for the user to fold them down so as to then move the step 1, without having to exert any effort on the lever 47 (or the handle 64 in the case of the third embodiment). This results in less fatigue for the user, and better freedom of movement.

Troisièmement, comme nous l'avons vu, le roulage du marchepied 1 peut être réalisé sans difficulté lorsque le marchepied 1 est replié (avec un maintien du plan 9 arrière contre le plan 2 avant) et que les barrières 24, 25 du garde-corps sont rabattues, grâce au déploiement du train 39 avant.Third, as we have seen, the running of the step 1 can be achieved without difficulty when the step 1 is folded (with a maintenance of the rear plane 9 against the front plane 2 ) and the barriers 24, 25 of the railing are folded, thanks to the deployment of the train 39 before.

La sécurité de l'utilisateur est en outre préservée puisque la position rabattue des barrières 24, 25, qui place le train 39 roulant dans sa position déployée pour permettre le roulage du marchepied 1, empêche l'utilisateur de monter sur celui-ci en le privant de l'accès au plancher 16. The safety of the user is further preserved since the folded position of the barriers 24, 25, which places the train 39 rolling in its deployed position to allow the running of the step 1, prevents the user from climbing on it by denying access to the floor 16.

Il va de soi que les modes de réalisation décrits ci-dessus le sont à titre illustratif. Diverses variantes pourraient être envisagées sans sortir du cadre de l'invention.It goes without saying that the embodiments described above are illustrative. Various variants could be envisaged without departing from the scope of the invention.

En particulier, et comme nous l'avons déjà évoqué, bien qu'un seul levier 47 soit prévu dans les modes de réalisation décrits, il est envisageable d'un monter un sur chaque montant 3, de sorte à équilibrer les efforts. Chaque levier peut être actionné par une barrière respective, ou les deux leviers peuvent être couplés via une barre d'effort, à la manière d'une barre anti-panique.In particular, and as we have already mentioned, although a single lever 47 is provided in the embodiments described, it is possible to mount one on each upright 3, so as to balance the efforts. Each lever can be actuated by a respective barrier, or the two levers can be coupled via a force bar, in the manner of an anti-panic bar.

De même, le levier 47 tel que décrit ci-dessus (quel qu'en soit le mode de réalisation) est monté au droit de la rampe 26 pour éviter les modifications structurelles de la barrière 25. Cependant, si l'on souhaite ménager la possibilité pour l'utilisateur de l'actionner manuellement sur des marchepieds de grande hauteur, ce montage pourrait s'avérer inconfortable (obligeant l'utilisateur à tendre le bras en hauteur pour atteindre le levier 47), voire impraticable, le levier 47 s'avérant hors de portée. Il peut par conséquent être envisagé de positionner le levier 47 plus bas sur le montant 3, et d'ajouter à la barrière 25 une pièce permettant d'actionner le levier 47 lorsque la barrière 25 est rabattue. Cette pièce se présente par exemple sous forme d'une patte ou d'un tube solidaire d'une barre reliant la rampe 26 à la section 28 inférieure parallèlement au montant 3, au voisinage des pivots 29. Similarly, the lever 47 as described above (whatever the embodiment) is mounted to the right of the ramp 26 to avoid structural modifications of the barrier 25. However, if we want to spare the possibility for the user to manually operate on steps of high height, this assembly could be uncomfortable (requiring the user to extend the arm height to reach the lever 47 ), or impractical, the lever 47 proving out of reach. It can therefore be envisaged to position the lever 47 lower on the upright 3, and to add to the barrier 25 a part for operating the lever 47 when the barrier 25 is folded. This piece is for example in the form of a tab or tube secured to a bar connecting the ramp 26 to the lower section 28 parallel to the upright 3, in the vicinity of the pivots 29.

Claims (11)

  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 railing (23) mounted on the front plane (2), this railing (23) comprising a pair of side barriers (24, 25), each mounted in articulated fashion on a front upright (3) between a deployed position in which each barrier (24, 25) extends essentially perpendicular to the front plane (2) and a folded position in which each barrier (24, 25) extends essentially parallel to the front plane (2),
    - 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) equipped with 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 front wheel (40) extends above the standing plane (P) and a deployed position in which the front wheel (40) projects downwards beyond the standing plane (P),
    - a mechanism (46) for activating the front undercarriage (39),
    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) in line with a movable part (26) of a barrier (25) and a rod (48) coupling the lever (47) to the front undercarriage (39) such that, in the folded position, the barrier (25) places, via the lever (47), the front undercarriage (39) in its deployed position.
  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 front undercarriage (39) comprises a crosspiece (41) which is mounted so as to be able to pivot between the front uprights (3) and on which is attached the or each front wheel (40).
  6. Step (1) according to Claim 5, 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).
  7. Step (1) according to one of Claims 1 to 6, characterized in that the lever (47) takes the form of a plate of which a front section (60) projects from the front plane (2), this front section (60) having a bevelled free end (62) for engaging with an inclined portion (26) of the barrier (25) when the latter is in the folded position.
  8. Step (1) according to one of Claims 1 to 6, characterized in that the activating mechanism (46) comprises a linkage (63) comprising an offset actuating handle (64) mounted on the barrier (25) and a stem (65) connecting the actuating handle (64) to the lever (47).
  9. Step (1) according to Claim 8, characterized in that the offset handle (64) is mounted in articulated fashion on a handrail (27) of the barrier (25) located on the side of the lever (47).
  10. Step (1) according to Claim 9, characterized in that the lever (47) is provided with a projecting tab (69) provided with a hole (68) in which is received a bent front end (66) of the stem (65).
  11. Step (1) according to one of the preceding claims, characterized in that, in the folded position of the step (1) with the rear plane (9) secured to the front plane (2), and in the folded position of the barriers (24, 25), the front undercarriage (39) projects beyond the ends (5, 12) of the front uprights (3) and of the rear uprights (10), to allow the step (1) to be wheeled on the front undercarriage (39).
EP14171331.3A 2013-06-25 2014-06-05 Step with retractable wheels with control by railing Active EP2818625B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1356095A FR3007449B1 (en) 2013-06-25 2013-06-25 FOOTBOARD WITH REMOVABLE WHEELS WITH BODY CONTROL

Publications (2)

Publication Number Publication Date
EP2818625A1 EP2818625A1 (en) 2014-12-31
EP2818625B1 true EP2818625B1 (en) 2015-11-04

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Application Number Title Priority Date Filing Date
EP14171331.3A Active EP2818625B1 (en) 2013-06-25 2014-06-05 Step with retractable wheels with control by railing

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EP (1) EP2818625B1 (en)
FR (1) FR3007449B1 (en)

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CN107083917A (en) * 2017-05-13 2017-08-22 嘉兴汇森集成家居有限公司 A kind of construction and decoration ladder

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FR3036423B1 (en) * 2015-05-20 2017-05-26 Cdh Group TABLET FOOTBOARD WITH ADJUSTABLE HEIGHT
US10858887B2 (en) 2016-08-11 2020-12-08 Bobo Ladders Llc Boat or recreational vehicle ladder apparatus
CN106285447B (en) * 2016-09-19 2017-12-22 国网浙江省电力公司温州供电公司 A kind of electric power overhaul instrument
CN106351564B (en) * 2016-09-19 2018-05-22 国网浙江省电力公司温州供电公司 A kind of telescopic insulation double ladder insulation platform for live operation
IT201800002173A1 (en) * 2018-01-30 2019-07-30 Ferrero Carlo Bars with pivoting toothed wheels and a lifting system, suitable for double ladders
CN108729843A (en) * 2018-05-20 2018-11-02 杨引利 A kind of portable anti-slip type electric power maintenance maintenance ladder
CN110173208B (en) * 2019-06-11 2020-11-06 浙江鸣春纺织股份有限公司 Construction ladder stand provided with rapid folding guardrail
CN111042463A (en) * 2019-12-31 2020-04-21 浙江工贸职业技术学院 Plank loft is with folding stair
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
CN114150997A (en) * 2021-12-02 2022-03-08 中国船舶工业系统工程研究院 Folding mechanical work ladder for ships

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US1912509A (en) * 1931-08-13 1933-06-06 Coburn Trolley Track Mfg Compa Ladder
US6026931A (en) 1998-10-26 2000-02-22 Emerson Electric Co. Support frame assembly
US6951265B2 (en) * 2003-08-04 2005-10-04 Ballymore Company, Inc. Foldable stairway ladder

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Publication number Priority date Publication date Assignee Title
CN107083917A (en) * 2017-05-13 2017-08-22 嘉兴汇森集成家居有限公司 A kind of construction and decoration ladder
CN107083917B (en) * 2017-05-13 2018-09-21 曙光建设有限公司 A kind of construction and decoration ladder

Also Published As

Publication number Publication date
FR3007449B1 (en) 2015-07-17
EP2818625A1 (en) 2014-12-31
FR3007449A1 (en) 2014-12-26

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