EP1109987B1 - Portable and foldable support structure useful as ladder or stepladder - Google Patents

Portable and foldable support structure useful as ladder or stepladder Download PDF

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Publication number
EP1109987B1
EP1109987B1 EP19990936691 EP99936691A EP1109987B1 EP 1109987 B1 EP1109987 B1 EP 1109987B1 EP 19990936691 EP19990936691 EP 19990936691 EP 99936691 A EP99936691 A EP 99936691A EP 1109987 B1 EP1109987 B1 EP 1109987B1
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European Patent Office
Prior art keywords
ramp
shaft
feet
support
extremity
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EP19990936691
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German (de)
French (fr)
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EP1109987A1 (en
Inventor
Bernard Clavel
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Bernard Clavel
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Priority to FR9811176A priority Critical patent/FR2783012B1/en
Priority to FR9811176 priority
Application filed by Bernard Clavel filed Critical Bernard Clavel
Priority to PCT/FR1999/001935 priority patent/WO2000014373A1/en
Publication of EP1109987A1 publication Critical patent/EP1109987A1/en
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    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C1/00Ladders in general
    • E06C1/02Ladders in general with rigid longitudinal member or members
    • E06C1/38Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/382Tripod ladders
    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C7/00Component parts, supporting parts, or accessories
    • E06C7/08Special construction of longitudinal members, or rungs or other treads
    • E06C7/081Rungs or other treads comprising anti-slip features

Description

La présente invention concerne une structure support portable et repliable, utilisable en tant qu'échelle ou escabeau pour permettre à une personne de se déplacer, notamment de monter ou de descendre, par exemple pour atteindre des objets autrement inaccessibles ou pour franchir des obstacles.The present invention relates to a portable support structure and foldable, usable as a ladder or stepladder to allow a person to move around, including getting on or off, for example to reach otherwise inaccessible objects or to cross obstacles.
D'une façon générale, on sait que les échelles classiques se composent de deux montants parallèles ou légèrement convergents réunis de place en place par des barreaux transversaux ou échelons servant de marches.Generally speaking, we know that classic scales consist of two parallel or slightly converging uprights joined from place to place by transverse bars or steps serving as steps.
Ces montants présentent, à l'une de leurs extrémités, des surfaces d'appui au sol éventuellement équipées de patins. Les deux autres extrémités des montants sont, quant à elles, destinées à venir porter sur une surface d'appui, par exemple sur une paroi verticale (cas d'une échelle simple) ou sont articulées à une structure support pouvant consister en une deuxième échelle (cas de l'échelle double).These uprights have, at one of their ends, bearing surfaces at the ground possibly equipped with skates. The other two ends of the uprights are, for their part, intended to come to bear on a bearing surface, for example on a vertical wall (case of a simple ladder) or are articulated to a support structure which may consist of a second ladder (case of the double scale).
Il existe également des échelles de coursive telle que celle qui se trouve décrite dans le brevet DE C 713545 qui comprend deux montants parallèles reliés par des marches. L'extrémité supérieure des montants est fixée au plancher supérieur tandis que l'extrémité inférieure repose sur le plancher inférieur. Une rampe que l'utilisateur peut enjamber est fixée sur les marches dans le plan médian de symétrie de l'échelle.There are also gangway scales such as the one found described in patent DE C 713545 which includes two parallel uprights connected by steps. The upper end of the uprights is fixed to the upper floor while the lower end rests on the floor inferior. A ramp that the user can step over is fixed on the steps in the median plane of symmetry of the scale.
Dans le cas d'un escabeau, les montants constituent des limons portant des marches en lieu et place des échelons. Dans ce cas, la structure support comprend deux montants parallèles reliés entre eux par des traverses ainsi qu'aux limons par des moyens d'entretoisement déconnectables.In the case of a stepladder, the uprights constitute stringers bearing steps instead of steps. In this case, the support structure includes two parallel uprights interconnected by crosspieces as well to the stringers by disconnectable bracing means.
Un escabeau de ce genre est décrit dans le brevet US 5 085 291.One such stepladder is described in US Patent 5,085,291.
Par le brevet US 1 976 345, on connaít également un escabeau repliable conforme au préambule de la revendication 1 et comprenant un limon de part et d'autre duquel sont respectivement disposées deux séries de marches. L'extrémité inférieure de ce limon est reliée à un piètement comportant deux pieds tandis que sur l'autre extrémité sont articulés deux pieds dont les parties centrales sont reliées au limon par l'intermédiaire de chaínes.By US Patent 1,976,345, there is also known a collapsible stepladder conforming to the preamble of claim 1 and comprising a stringer on either side of which are respectively arranged two sets of steps. The lower end of this stringer is connected to a base comprising two feet while on the other end are articulated two feet whose central parts are connected to the stringer via of chains.
Il s'avère qu'en règle générale, pour assurer son équilibre, l'utilisateur monté sur une échelle est souvent obligé de se tenir d'une main sur les barreaux ou sur le montant et ne dispose donc pas de toute la liberté de mouvement qu'il souhaiterait avoir. Cet inconvénient est particulièrement préjudiciable lorsque l'utilisateur doit effectuer des travaux, par exemple des travaux de peinture nécessitant l'usage simultané des deux mains.It turns out that, as a general rule, to ensure balance, the user mounted on a ladder is often forced to hold one hand on bars or on the upright and therefore does not have all the freedom of movement it would like to have. This drawback is particularly detrimental when the user must carry out work, for example painting work requiring the simultaneous use of both hands.
Un autre problème que posent les solutions classiques concerne la stabilité de l'échelle et les risques de chute de l'utilisateur, étant entendu que cette stabilité ne peut être atteinte que si la projection verticale du centre de gravité de l'utilisateur et/ou de l'échelle se trouve à l'intérieur du polygone de sustentation de l'échelle, c'est-à-dire un polygone formé par la projection verticale, dans un plan horizontal des points d'appui de l'échelle. Another problem posed by conventional solutions concerns the stability of the scale and the risk of the user falling, it being understood that this stability can only be reached if the vertical projection of the center of gravity of the user and / or the scale is inside the support polygon of the scale, i.e. a polygon formed by the vertical projection, in a horizontal plane of the scale support points.
Or, les dimensions de ce polygone de sustentation sont variables selon l'emplacement des points d'appui de l'échelle, tandis que rien ne permet à l'utilisateur d'indiquer la position de son centre de gravité vis-à-vis de ce polygone.However, the dimensions of this support polygon are variable according to the location of the support points of the ladder, while nothing allows the user to indicate the position of his center of gravity vis-à-vis this polygon.
L'utilisateur peut donc se trouver en déséquilibre et chuter sans qu'un signe précurseur ne l'ait averti du danger.The user can therefore be in imbalance and fall without a sign precursor did not warn him of the danger.
Cet inconvénient se manifeste tout particulièrement dans le cas des échelles doubles ou des escabeaux qui comportent quatre points d'appui au sol : Compte tenu des irrégularités de forme du sol, l'échelle ou l'escabeau ne repose en fait, le plus souvent, que sur trois pieds, ce qui diminue considérablement les dimensions du polygone de sustentation. En outre, la verticalité de l'échelle ou de l'escabeau est relativement difficile à obtenir, ce qui accroít d'autant les risques de chute.This drawback manifests itself particularly in the case of ladders double or stepladders which have four points of support on the ground: Given the irregularities in the shape of the ground, the ladder or stepladder does not rests in fact, more often than not, on three feet, which decreases considerably the dimensions of the support polygon. In addition, the verticality of the ladder or stepladder is relatively difficult to obtain, this which increases the risk of falling.
L'invention a donc tout particulièrement pour but de supprimer ces inconvénients et de résoudre ces problèmes. Elle se propose de parvenir à ces résultats au moyen d'une structure support présentant une structure relativement simple facilement repliable et néanmoins peu coûteuse.The invention therefore particularly aims to remove these disadvantages and solve these problems. It intends to achieve these results using a support structure having a relatively simple structure easily foldable and nevertheless inexpensive.
Selon l'invention, la structure support repliable et portable, utilisable en tant qu'échelle ou escabeau, comprend
  • un limon de part et d'autre duquel sont fixées deux séries de marches respectives, ce limon comprenant une extrémité inférieure destinée à venir en appui sur le sol et une seconde extrémité sur laquelle sont articulés deux pieds dont les extrémités inférieures sont destinées à venir en appui sur le sol,
  • l'extrémité inférieure du limon comprenant un patin d'appui au sol de sorte qu'à l'état déployé la structure présente une structure tripode , une rampe, solidaire du limon, qui s'étend à la verticale de ce dernier, à une distance des marches inférieure à la longueur moyenne d'une jambe, de manière à ce qu'un utilisateur puisse se déplacer sur les marches en enjambant la rampe et puisse serrer ladite rampe entre ses jambes pour se tenir à la structure sans avoir à utiliser ses mains.
According to the invention, the foldable and portable support structure, usable as a ladder or stepladder, comprises
  • a stringer on either side of which are fixed two respective series of steps, this stringer comprising a lower end intended to come to rest on the ground and a second end on which are articulated two feet whose lower ends are intended to come in support on the ground,
  • the lower end of the stringer comprising a support pad on the ground so that in the deployed state the structure has a tripod structure, a ramp, integral with the stringer, which extends vertically from the latter, at a distance of the steps less than the average length of a leg, so that a user can move on the steps by spanning the ramp and can tighten said ramp between his legs to hold on to the structure without having to use his hands.
Ce double appui sur la rampe tend à ramener l'utilisateur dans un plan vertical, dans la position où il bénéficie de la meilleure stabilité.This double pressing on the ramp tends to bring the user back into a vertical plane, in the position where it has the best stability.
Avantageusement, les marches pourront comprendre des moyens de blocage latéral des pieds de manière à assurer une meilleure solidarisation structure/utilisateur, lorsque celui-ci serre la rampe entre ses jambes.Advantageously, the steps may include blocking means lateral of the feet so as to ensure better joining structure / user, when the latter squeezes the ramp between his legs.
D'autres modes de réalisation avantageux sont définis dans les revendications dépendantes.Other advantageous embodiments are defined in the dependent claims.
Un mode d'exécution de l'invention sera décrit ci-après, à titre d'exemple non limitatif, avec référence aux dessins annexés dans lesquels :
  • Les figures 1 et 2 sont des vues en perspective 3/4 avant (figure 1) et 3/4 arrière (figure 2) d'une échelle/escabeau selon l'invention ;
  • La figure 3 est une vue de face de l'échelle/escabeau représentée sur les figures 1 et 2 ;
  • La figure 4 montre l'échelle/escabeau à l'état replié.
  • An embodiment of the invention will be described below, by way of nonlimiting example, with reference to the appended drawings in which:
    • Figures 1 and 2 are perspective views 3/4 front (Figure 1) and 3/4 rear (Figure 2) of a ladder / stepladder according to the invention;
    • Figure 3 is a front view of the ladder / stepladder shown in Figures 1 and 2;
    • Figure 4 shows the ladder / stepladder in the folded state.
    Dans cet exemple, le limon 1 de l'échelle/escabeau est constitué par deux longerons 2, 3 consistant chacun en un profilé en aluminium de section rectangulaire. Ces deux longerons 2, 3 s'étendent parallèlement l'un par rapport à l'autre et sont solidarisés l'un à l'autre grâce à deux séries de biellettes d'entretoisement obliques 4, 5 - 4', 5', fixées sur les longerons 2, 3 par leurs extrémités.In this example, the stringer 1 of the ladder / stepladder consists of two side rails 2, 3 each consisting of an aluminum section profile rectangular. These two beams 2, 3 extend parallel to one another to each other and are joined to each other thanks to two sets of rods oblique bracing 4, 5 - 4 ', 5', fixed on the side members 2, 3 by their ends.
    L'un des deux longerons, 3, légèrement plus long que l'autre, 2, se termine dans le bas par un patin 6 destiné à venir en appui sur le sol. Ce longeron 3 porte une rampe 7 de section circulaire qui s'étend au-dessus du limon 1 dans un même plan vertical. La fixation de la rampe 7 sur le limon 1 est assurée par une série de colliers fixés sur le longeron 3. Dans sa partie supérieure, la rampe 7 forme un coude 9 entourant partiellement l'extrémité du longeron 3.One of the two beams, 3, slightly longer than the other, 2, ends at the bottom by a shoe 6 intended to come to rest on the ground. This spar 3 carries a ramp 7 of circular section which extends above the stringer 1 in the same vertical plane. The ramp 7 is fixed to the stringer 1 by a series of collars fixed to the spar 3. In its upper part, the ramp 7 forms an elbow 9 partially surrounding the end of the beam 3.
    Le longeron 2 supporte, quant à lui, une succession de doubles marches M1, M'1 - M2, M'2 - M3, M'3 qui s'étendent chacune transversalement de part et d'autre du plan vertical du limon 1.The spar 2 supports, meanwhile, a succession of double steps M 1 , M ' 1 - M 2 , M' 2 - M 3 , M ' 3 which each extend transversely on either side of the vertical plane of the silt 1.
    Dans cet exemple, ces doubles marches M1, M'1 - M2, M'2 - M3, M'3 comprennent chacune deux plaques P qui s'étendent horizontalement de part et d'autre du plan du limon 1 et qui sont portées par des traverses tubulaires T venant se fixer par boulonnage sur une paire de biellettes horizontales 4, 5. In this example, these double steps M 1 , M ' 1 - M 2 , M' 2 - M 3 , M ' 3 each comprise two plates P which extend horizontally on either side of the plane of the stringer 1 and which are carried by tubular cross members T which are fixed by bolting to a pair of horizontal rods 4, 5.
    Cette paire de biellettes horizontales 4, 5 se trouve ici contreventée par une paire de biellettes obliques 4', 5' qui s'étend dans l'intervalle formé entre lesdites biellettes 4, 5 et la marche qui se trouve juste en dessous.This pair of horizontal rods 4, 5 is here braced by a pair of oblique rods 4 ', 5' which extends in the gap formed between said links 4, 5 and the step which is just below.
    Avantageusement, les plaques P sont munies d'éléments en relief antidérapants et présentent chacune, au niveau de leurs bordures latérales, un repli R vers le haut servant à empêcher que les pieds de l'utilisateur ne puissent déraper latéralement.Advantageously, the plates P are provided with non-slip raised elements and each have, at their lateral edges, a fold R towards the high to prevent the user's feet from slipping laterally.
    Le couple de biellettes horizontales 4, 5 situé à l'extrémité supérieure du limon 1 supporte une tablette TB également antidérapante sur laquelle un objet, par exemple un pot de peinture, peut être posé. Ce couple de biellettes 4", 5", de section plus importante que celles des biellettes 4, 5, porte au-dessous de la tablette une traverse TR sur les extrémités de laquelle viennent s'articuler deux pieds P1, P2 terminés à leurs extrémités inférieures par des patins d'appui au sol 11, 12.The pair of horizontal rods 4, 5 located at the upper end of the stringer 1 supports a shelf TB also non-slip on which an object, for example a paint can, can be placed. This pair of rods 4 ", 5", of larger section than those of the rods 4, 5, carries below the shelf a cross-member TR on the ends of which come to articulate two feet P 1 , P 2 terminated at their lower ends by support pads on the ground 11, 12.
    A l'état déployé, ces pieds P1, P2 forment avec le longeron 3 un tripode qui délimite un volume prismatique à l'intérieur duquel les marches M1, M'1 - M2, M'2 - M3, M'3 se trouvent disposées, en contrebas du longeron 3. Dans cette position, les deux pieds P1, P2 se trouvent solidarisés l'un à l'autre grâce à une traverse déconnectable TD.In the deployed state, these feet P 1 , P 2 form with the spar 3 a tripod which delimits a prismatic volume inside which the steps M 1 , M ' 1 - M 2 , M' 2 - M 3 , M ' 3 are arranged below the spar 3. In this position, the two feet P 1 , P 2 are secured to each other by a disconnectable cross TD.
    Grâce à ces dispositions, l'échelle/escabeau offre à l'utilisateur une stabilité et une sécurité inégalées.Thanks to these provisions, the ladder / stepladder offers the user stability and unmatched security.
    Du fait de sa structure tripode, l'échelle/escabeau peut être placée sur des sols éventuellement accidentés, étant entendu que l'utilisateur s'efforcera de la disposer de manière à ce que son plan de symétrie soit vertical. Due to its tripod structure, the ladder / stepladder can be placed on floors possibly accidented, it being understood that the user will endeavor to arrange so that its plane of symmetry is vertical.
    Dans tous les cas, l'utilisateur monté sur l'échelle/escabeau pourra "faire corps" avec cette dernière en serrant la rampe entre ses jambes. De ce fait, le plan vertical de symétrie de l'utilisateur dans lequel est situé son centre de gravité se trouve ramené dans le plan vertical de symétrie de l'échelle/escabeau (plan bissecteur du dièdre formé par le limon 1 et les deux pieds P1, P2).In all cases, the user mounted on the ladder / stepladder can "become one" with the latter by squeezing the ramp between his legs. As a result, the vertical plane of symmetry of the user in which his center of gravity is located is reduced to the vertical plane of symmetry of the ladder / stepladder (bisector plane of the dihedral formed by the stringer 1 and the two feet P 1 , P 2 ).
    De ce fait, la verticale du centre de gravité de l'ensemble utilisateur échelle/escabeau passe donc forcément à l'intérieur du polygone de sustentation de l'échelle/escabeau. La stabilité de l'ensemble se trouve donc garantie.Therefore, the vertical of the center of gravity of the user assembly ladder / stepladder therefore necessarily passes inside the polygon of lift of the ladder / stepladder. The stability of the whole is therefore guarantee.
    Cette stabilité demeure excellente même dans le cas où l'utilisateur se sert de ses deux mains pour effectuer des travaux et a donc l'obligation de serrer la rampe entre ses deux jambes.This stability remains excellent even when the user uses both hands to carry out work and therefore has the obligation to tighten the crawls between his two legs.
    Un autre avantage important de l'échelle/escabeau précédemment décrite consiste en ce qu'elle peut se replier pour n'occuper, à l'état replié, qu'un volume très réduit. Dans cette position, l'utilisateur peut se servir de la rampe 7 pour porter l'échelle/escabeau.Another important advantage of the ladder / stepladder previously described consists in that it can fold back to occupy, in the folded state, only one very small volume. In this position, the user can use the ramp 7 to carry the ladder / stepladder.
    En effet, les deux pieds peuvent venir se rabattre contre le limon 1, de sorte que le volume de l'ensemble, à l'état replié, se réduit sensiblement aux dimensions du limon 1 et des marches M1, M'1 - M2, M'2 - M3, M'3 (figure 4).Indeed, the two feet can come to fold against the stringer 1, so that the volume of the assembly, in the folded state, is reduced substantially to the dimensions of the stringer 1 and the steps M 1 , M ′ 1 - M 2 , M ' 2 - M 3 , M' 3 (Figure 4).
    Dans l'exemple précédemment décrit, les marches M1, M'1 - M2, M'2 - M3, M'3 pourront occuper des positions décalées en hauteur d'environ 21 cm, le limon étant incliné d'environ 30°. In the example described above, the steps M 1 , M ' 1 - M 2 , M' 2 - M 3 , M ' 3 may occupy positions offset in height by approximately 21 cm, the stringer being inclined by approximately 30 °.
    La largeur du limon 1 (distance séparant ses arêtes supérieure et inférieure) est telle que la verticale à l'aplomb du premier tiers d'une marche recoupe l'arête supérieure du "limon" à une hauteur d'environ 40 cm.The width of stringer 1 (distance between its upper and lower edges) is such that the vertical above the first third of a step intersects the edge upper of the "stringer" at a height of about 40 cm.
    La rampe 7 est située à environ 40 cm au-dessus des marches de manière à pouvoir venir en appui entre les mollets et les genoux de l'utilisateur.Ramp 7 is located approximately 40 cm above the steps so that be able to come into contact between the user's calves and knees.
    Bien entendu, l'invention ne se limite pas au mode d'exécution précédemment décrit.Of course, the invention is not limited to the embodiment previously described.
    Ainsi, par exemple, les pieds P1, P2 de l'échelle/escabeau pourront être réglables en longueur de manière à permettre un réglage de verticalité, notamment dans le cas d'un sol accidenté. A cet effet, chaque pied P1, P2 pourra comprendre deux éléments s'emboítant télescopiquement l'un dans l'autre et des moyens de fixation permettant de solidariser les deux éléments dans la position axiale correspondant à la longueur du pied que l'on désire obtenir.Thus, for example, the feet P 1 , P 2 of the ladder / stepladder may be adjustable in length so as to allow adjustment of verticality, in particular in the case of uneven ground. To this end, each foot P 1 , P 2 may comprise two elements which telescopically fit into one another and fixing means making it possible to secure the two elements in the axial position corresponding to the length of the foot that the we want to get.
    Par ailleurs, la susdite rampe pourra consister en le longeron supérieur 3 du limon 1. Celui-ci pourra être prolongé au-delà de son extrémité supérieure par un tronçon de rampe qui s'engage télescopiquement dans le longeron 3. Un blocage axial multiposition de ce tronçon dans le longeron pourra alors être assuré par tous moyens de fixation connus.Furthermore, the above ramp may consist of the upper beam 3 of the stringer 1. This can be extended beyond its upper end by a section of ramp which engages telescopically in the beam 3. A multiposition axial locking of this section in the beam can then be provided by all known fixing means.
    L'extrémité supérieure de ce tronçon pourra être équipée d'un crochet ou similaire, pouvant servir à suspendre un objet, par exemple un pot ou un panier. The upper end of this section may be fitted with a hook or similar, which can be used to hang an object, for example a pot or a basket.
    De préférence, les pieds seront orientés de manière à ce que l'extrémité supérieure du limon 1 se trouve sensiblement à la verticale du barycentre du triangle formé par les patins 6, 11, 12.Preferably, the feet will be oriented so that the end upper stringer 1 is located substantially vertical to the barycenter of the triangle formed by the pads 6, 11, 12.
    Dans ce cas, la stabilité de l'ensemble structure/utilisateur deviendra de plus en plus grande, au fur et à mesure que l'on monte sur les marches, pour devenir maximale au niveau de la dernière marche, le centre de gravité de l'utilisateur se trouvant alors à la verticale du barycentre du polygone de sustentation.In this case, the stability of the structure / user set will become increasingly bigger, as you go up the steps, to become maximum at the level of the last step, the user's center of gravity then being vertical to the barycenter of the support polygon.

    Claims (11)

    1. Folding and portable support structure able to be used as a ladder or stepladder comprising a shaft (1) on both sides from which are secured two sets of steps (M1, M'1 - M2, M'2 - M3, M'3), said shaft comprising a lower extremity intended to come into support on the ground and a second extremity on which are articulated two feet (P1, P2)whose the lower extremities are intended to come into support on the ground, characterised in that the upper extremity of the shaft (1) comprises a support bolster on the ground so that in the deployed state the structure presents a tripod structure, and in that it comprises a ramp (7) integral with the shaft (1) and which extends to the vertical of the latter to a distance from the steps (M1, M'1 - M2, M'2 - M3, M'3) smaller that the average length of a leg so that a user is able to move on the steps (M1, M'1 - M2, M'2 - M3, M'3) by straddling the ramp (7) and can keep said ramp tight between his legs so as to remain on the structure without having to use his hand s.
    2. Structure according to claim 1, characterised in that the steps (M 1, M'1 - M2, M'2 - M3, M'3) include means ( R ) for side locking the feet so as to provide improved structure/user integrality when said user keep the ramp tight between his legs.
    3. Structure according to one of the preceding claims, characterised in that the shaft (1) of the ladder/stepladder includes two parallel longitudinal girders (2, 3) rendered integral with each other by pairs of bracing rocker bars (4, 5 - 4', 5'), one of the longitudinal girders (3) slightly longer than the other being ended at the bottom by a support bolster (6) on the ground.
    4. Structure according to claim 3, characterised in that said ramp is secured to the longer longitudinal girder (3), whereas said s teps are supported by the shorter longitudinal girder (2).
    5. Structure according to claim 3, characterised in that said ramp consists of the longer longitudinal girder (3).
    6. Structure according to claim 5, characterised in that said ramp is extended by a ramp section telescopically engaged in the longer longitudinal girder (3), the upper extremity of said section able to be equipped with a hook.
    7. Structure according to one of the preceding claims, characterised in that it includes two sets of pairs of bracing rocker bars, the pairs (4, 5) of one of the sets being horizontal, whereas the pairs (4', 5') of the other set are oblique and ensure a crossbracing of the horizontal rocker bars (4, 5), and in that the pairs of the horizontal rocker bars (4, 5) each support one pair of steps (M1, M'1 - M2, M'2 - M3, M'3) extending transversally on both sides of the shaft (1).
    8. Structure according to one of the preceding claims, characterised in that said steps (M1, M'1 - M2, M'2 - M3, M'3) consist of plates (P) fitted with anti-skid elements and having lateral borders ( R ) folded upwards.
    9. Structure according to one of the preceding claims, characterised in that it includes a pair of horizontal rocker bars (4", 5") situated at the upper extremity of the shaft (1) and supporting a table on which an object can be placed, and in that said rocker bars (4", 5") bear a crosspiece (TR) to the extremities of which the two feet (P1, P2) are joined.
    10. Structure according to one of the preceding claims, characteris ed in that the feet (P1, P2) are orientated so that the upper extremity of the shaft (1) is located approximately to the vertical of the centre of the triangle formed by the bolsters (6, 11, 12) mounted at the extremities of the shaft (1) and feet (P 1, P2) respectively.
    11. Structure according to claim 1, characterised in that the two feet (P 1, P2) are rendered integral by a disconnectable crosspiece (TD).
    EP19990936691 1998-09-04 1999-07-30 Portable and foldable support structure useful as ladder or stepladder Expired - Lifetime EP1109987B1 (en)

    Priority Applications (3)

    Application Number Priority Date Filing Date Title
    FR9811176A FR2783012B1 (en) 1998-09-04 1998-09-04 PORTABLE SUPPORT STRUCTURE THAT CAN BE USED AS A LADDER OR STEP
    FR9811176 1998-09-04
    PCT/FR1999/001935 WO2000014373A1 (en) 1998-09-04 1999-07-30 Portable support structure useful as ladder or stepladder

    Publications (2)

    Publication Number Publication Date
    EP1109987A1 EP1109987A1 (en) 2001-06-27
    EP1109987B1 true EP1109987B1 (en) 2004-08-18

    Family

    ID=9530201

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP19990936691 Expired - Lifetime EP1109987B1 (en) 1998-09-04 1999-07-30 Portable and foldable support structure useful as ladder or stepladder

    Country Status (6)

    Country Link
    US (1) US6386320B1 (en)
    EP (1) EP1109987B1 (en)
    AU (1) AU5169899A (en)
    DE (1) DE69919551D1 (en)
    FR (1) FR2783012B1 (en)
    WO (1) WO2000014373A1 (en)

    Families Citing this family (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2784115B1 (en) 1998-10-05 2000-12-15 Rhodia Chimie Sa COATING COMPOSITION CONTAINING FUNCTIONALIZED SILICONES
    US6874598B1 (en) 2002-10-15 2005-04-05 William H. Baker Ergonomically improved tripod stepladder
    US6951265B2 (en) * 2003-08-04 2005-10-04 Ballymore Company, Inc. Foldable stairway ladder
    CN104885514B (en) 2012-11-01 2019-05-21 英特尔公司 The signal of qos requirement and UE power preference is sent in LTE-A network
    WO2014132733A1 (en) * 2013-02-26 2014-09-04 Aoi Tokuo Stepladder
    JP1519488S (en) 2014-07-10 2015-03-16
    JP6542892B2 (en) * 2014-12-15 2019-07-10 ロデンビー,グレン Vertically oriented ladder device for enabling climbers to adopt an improved climb position during use
    USD757959S1 (en) 2015-04-28 2016-05-31 Tokuo AOI Stepladder
    USD758615S1 (en) 2015-04-28 2016-06-07 Tokuo AOI Stepladder
    USD765269S1 (en) 2015-04-28 2016-08-30 Tokuo AOI Stepladder

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    US322414A (en) * 1885-07-21 Step-ladder
    US68193A (en) * 1867-08-27 Improvement in elevating-block
    US791509A (en) * 1903-12-12 1905-06-06 John G Soergel Step-ladder.
    US1511580A (en) * 1924-02-18 1924-10-14 Prince Willis Self-supporting ladder
    US1976345A (en) * 1932-10-03 1934-10-09 Hruby Frank Ladder
    DE713545C (en) * 1938-07-01 1941-11-10 Arno Fischer Ladder stairs
    FR1184292A (en) * 1957-10-14 1959-07-20 ladder with adjustable foot for fruit trees or for any other application
    US4199040A (en) * 1979-01-22 1980-04-22 The Laitram Corporation Ship ladder
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    US4535871A (en) * 1981-09-28 1985-08-20 The Laitram Corporation Unitary stairway
    US4798262A (en) * 1986-09-12 1989-01-17 Paul Margolies Tripodal support
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    DE29712753U1 (en) * 1997-07-18 1997-09-11 Soell Gmbh Retractable extension of the guide rail of a fall arrest device
    US6076634A (en) * 1999-01-14 2000-06-20 Simon; Steve J. Mast ladder assembly

    Also Published As

    Publication number Publication date
    US6386320B1 (en) 2002-05-14
    AU5169899A (en) 2000-03-27
    DE69919551D1 (en) 2004-09-23
    WO2000014373A1 (en) 2000-03-16
    EP1109987A1 (en) 2001-06-27
    FR2783012A1 (en) 2000-03-10
    FR2783012B1 (en) 2000-10-27

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