EP1416117B1 - Adjustable ladder - Google Patents

Adjustable ladder Download PDF

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Publication number
EP1416117B1
EP1416117B1 EP03370036A EP03370036A EP1416117B1 EP 1416117 B1 EP1416117 B1 EP 1416117B1 EP 03370036 A EP03370036 A EP 03370036A EP 03370036 A EP03370036 A EP 03370036A EP 1416117 B1 EP1416117 B1 EP 1416117B1
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EP
European Patent Office
Prior art keywords
ladder
uprights
branch
prop
length
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EP03370036A
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German (de)
French (fr)
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EP1416117A1 (en
Inventor
André Fournier
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Fournier Sarl Ets
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Fournier Sarl Ets
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Publication of EP1416117A1 publication Critical patent/EP1416117A1/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
    • E06C1/382—Tripod ladders
    • 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
    • E06C1/14—Ladders capable of standing by themselves
    • E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
    • E06C1/20—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles
    • E06C1/22—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles with extensible, e.g. telescopic, ladder parts or struts

Definitions

  • the invention relates to an adjustable ladder.
  • a ladder consists of two uprights connected by bars or sleepers.
  • the user of the ladder does not have a fulcrum and he must therefore use another type of scale namely double scales.
  • This double ladder includes a second ladder articulated on the upper part of the uprights.
  • This second scale is often in a simplified form consisting of two amounts connected, in particular, at the base by a single cross.
  • a flexible link can limit the opening.
  • Ladders are also known whose counter-support is constituted by a simple section so that a support is formed at three points which is favorable to the stability.
  • a scale according to the preamble of claim 1 is described in US-548670 .
  • a ladder 1 consists of two uprights 2 connected by sleepers 3 or steps 3 and a counter-support 4 articulated on the uprights 2.
  • the sleepers are steps.
  • counter-support 4 is constituted by a profile maintained at its upper end between the two amounts 2 above.
  • This scale comprises a means for limiting the distance of the counter-support relative to the amounts.
  • it is one or two straps.
  • the scale comprises, at a distance from its vertex A, a so-called locking device 5 which, in the active position, extends in a plane P parallel to the support plane R of the scale and locks the geometric arrangement amounts 2 and counter-support 4.
  • This device 5 is articulated on the uprights 2 and guided in translation on the abutment support 4.
  • the locking device 5 is not represented on the figure 1 .
  • the articulation of the counter-support is done on the top of the uprights.
  • the abutment bears, on its side facing the uprights, a fitting 6 slightly spaced from the face of the abutment behind which the fitting slides the end of a triangular piece 5A whose base is hinged to the rear of the uprights .
  • This triangular piece 5A is, for example, formed from a round wire folded so that it forms a kind of Vé whose free ends 5C are engaged in 5D fittings carried by the uprights 2 to form a hinge.
  • This triangular piece 5A has in its opposite portion to the aforementioned articulation a loop 20 which slides along the fitting 6 carried by the counter-support 4.
  • the loop 20 may be delimited by the round wire and a tablet 5B engaging inside the Vee of the triangular piece 5A.
  • Transverse stiffeners 21 connect the branches of the V e for better rigidity.
  • tip 22 of the Ve is inclined relative to the plane containing the branches and downwards so that the loop 20 slides with a small clearance of operation around the fitting 6 of the counter-support.
  • This fitting 6 of the counter-support has at least one notch 23 to lock in translation the triangular piece 5A in horizontal position.
  • a second notch is provided for locking in the folded position.
  • This locking device makes it possible to give a geometrical resistance to the tripod thus opened.
  • the front of the uprights is connected by a plate 24 stiffening the assembly at the head and maintaining the axis of rotation which is invisible.
  • the user is in workstation on the penultimate step in support of the access plan with practically the hip at the height of the hedge and therefore at the appropriate height for the cutting tool.
  • the ladder can not switch.
  • the angle defined between the plane defined by the amounts and the counter-support is of the order of 40 °.
  • the angle V formed by the two uprights is of the order of 22 °.
  • the length of the abutment and the angles are determined so that the center of gravity is closer to the counter-support so that the weight of the user is oriented towards the profile 4.
  • the angle G between the ground and the plane containing the amounts is less than the angle F between the ground and the counter-support.
  • This angle G is about 65 ° and the angle F is 75 °.
  • a pad 7 or support shoe extended much greater than the section of the section 4 so as to place this counter-support on loose ground.
  • this section is either cut in the mass, or consists of two pieces of wood assembled.
  • the first sleepers from the bottom are connected by a bar 8 of load recovery avoiding in particular a risk of bending of the longer sleepers.
  • the face of this bar 8 facing the counter-support will present a groove to partially accommodate the counter-support.
  • the rear of this bar 8 may be provided with a fastening means of the profile such as a system loops and hooks, which may be partially housed in the aforementioned groove.
  • the counter-support 4 is of variable length so that the horizontality of the steps can be maintained even if the ground is sloping in one direction or the other.
  • the counter-support 4 is formed of at least one telescopic element with a locking means 41, either stepwise or at any point.
  • the counter-support 4 may consist of two nested tubes but a more resistant solution and to implement full profiles is described below.
  • the abutment 4 comprises, on the one hand, a main branch 4A which, extending from the top of the ladder, is of shorter length than the uprights and, on the other hand, a secondary branch 4B consists of two sections held apart by 4D legs, this secondary branch to cap the main branch.
  • Holes 50 in the two branches come into coincidence to introduce a pin 51 and thus to lock the translation of the branches.
  • the abutment 4 comprises, on the one hand, a main branch 4A which, extending from the top of the ladder, is of shorter length than the uprights and, on the other hand, a secondary branch 4B consisting of a profile having a longitudinal groove 4E coming to house the main branch, one or more tabs closing the entrance of the groove to maintain the second branch on the first.
  • a first branch 4A having a T-section so that the inner faces 4G of the horizontal arm of the T participate in guiding.
  • the lengths of the branches will be determined so that the length of the counter-support may be shorter than the length of the uprights or be greater.
  • the range of variation may be of the order of a meter or more.

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  • Ladders (AREA)
  • Valve Device For Special Equipments (AREA)
  • Soil Working Implements (AREA)

Abstract

The adjustable step ladder has two uprights (2) connected by rungs (3). A counter strut (4) is hinged to the uprights and is adjustable in length. The counter strut has a locking brace (5) adjacent to its top to retain the uprights and counter strut in their relative positions. The counter strut can be telescopic.

Description

L'invention se rapporte à une échelle réglable.The invention relates to an adjustable ladder.

Classiquement, une échelle se compose de deux montants reliés par des barreaux ou traverses.Classically, a ladder consists of two uprights connected by bars or sleepers.

Souvent les montants sont parallèles mais parfois les montants sont convergents vers le sommet de l'échelle.Often the amounts are parallel but sometimes the amounts converge towards the top of the scale.

Tel est le cas des échelles utilisées par les laveurs de vitres qui bien souvent doivent appuyer leur échelle sur les montants des baies vitrées, lesquels montants sont étroits.Such is the case of ladders used by window cleaners who often have to support their ladder on the amounts of windows, which amounts are narrow.

En effet, il n'est pas question de s'appuyer sur la vitre car celle-ci est considérée comme trop fragile.Indeed, there is no question of leaning on the glass because it is considered too fragile.

Ces échelles nécessitent donc de disposer d'un point d'appui pour le sommet de celle-ci.These scales therefore require to have a fulcrum for the top of it.

Dans certain cas, l'utilisateur de l'échelle ne dispose pas d'un point d'appui et il doit donc utiliser un autre type d'échelle à savoir des échelles doubles.In some cases, the user of the ladder does not have a fulcrum and he must therefore use another type of scale namely double scales.

Cette échelle double comprend une deuxième échelle articulée sur la partie supérieure des montants.This double ladder includes a second ladder articulated on the upper part of the uprights.

Cette deuxième échelle se présente souvent sous une forme simplifiée constituée de deux montants reliés, notamment, à la base par une seule traverse.This second scale is often in a simplified form consisting of two amounts connected, in particular, at the base by a single cross.

Ce support ou contre-appui et l'échelle, lorsqu'ils sont en position d'utilisation, forment en vue de côté un triangle.This support or against-support and the ladder, when in the position of use, form in side view a triangle.

Pour éviter que le triangle s'ouvre, généralement, un lien souple permet de limiter l'ouverture.To prevent the triangle from opening, generally, a flexible link can limit the opening.

Ces échelles, à quatre points d'appui au sol, doivent être utilisées sur des terrains plats.These ladders, at four points of support on the ground, must be used on flat ground.

En effet, en terrain meuble, le risque de tomber est important.Indeed, in soft ground, the risk of falling is important.

Parfois, à la base de ces échelles, on y ajoute un stabilisateur mais dont l'efficacité est limitée.Sometimes, at the base of these scales, one adds a stabilizer but whose effectiveness is limited.

On connaît également des échelles dont le contre-appui est constitué par un simple profilé en sorte que l'on forme un appui en trois points ce qui est favorable à la stabilité.Ladders are also known whose counter-support is constituted by a simple section so that a support is formed at three points which is favorable to the stability.

Une échelle conforme au préambule de la revendication 1 est décrite dans US-A-548670 .A scale according to the preamble of claim 1 is described in US-548670 .

Si ces échelles fonctionnent parfaitement bien sur un sol plan, lorsque celui ci est incliné, le centre de gravité se trouve alors déplacé et le risque de chute devient alors non négligeable.If these scales work perfectly well on a flat ground, when it is tilted, the center of gravity is then displaced and the risk of falling becomes not insignificant.

Un des résultats que vise l'invention est une échelle du type précité qui apporte une solution aux problèmes évoqués ci-avant.One of the results that the invention aims is a scale of the aforementioned type that provides a solution to the problems mentioned above.

A cet effet, l'invention a pour objet une échelle réglable comprenant deux montants reliés par des traverses ou échelons et un contre-appui articulé sur les montants, cette échelle étant caractérisé :

  • en ce que le contre-appui est de longueur variable et,
  • en ce qu'elle comprend, à distance de son sommet, un dispositif dit de verrouillage comprenant une pièce de liaison formant un plan articulé sur les montants et guidé en translation sur le contre-appui qui, en position active, s'étend toujours dans un plan parallèle au plan d'appui de l'échelle quel que soit l'inclinaison dudit plan d'appui et verrouille la disposition géométrique des montants et du contre-appui.
For this purpose, the subject of the invention is an adjustable ladder comprising two uprights connected by sleepers or rungs and a counter-support articulated on the uprights, this ladder being characterized:
  • in that the counter-support is of variable length and,
  • in that it comprises, at a distance from its top, a so-called locking device comprising a connecting piece forming a plane articulated on the uprights and guided in translation on the abutment which, in the active position, always extends into a plane parallel to the support plane of the scale regardless of the inclination of said support plane and locks the geometric disposition of the amounts and the counter-support.

L'invention sera bien comprise à l'aide de la description ci-après faite à titre d'exemple non limitatif en regard du dessin ci-annexé qui représente schématiquement :

  • figure 1 : une vue de face de l'échelle,
  • figure 2 : une vue de côté de l'échelle,
  • figure 3 : un détail de l'échelle vue de dessus
  • figure 4 : une vue partielle de côté de la figure 3,
  • figure 5 : une échelle sur un sol pentu,
  • figures 6 à 8 : trois variantes de l'invention.
The invention will be better understood using the following description given by way of non-limiting example with reference to the attached drawing which schematically shows:
  • figure 1 : a front view of the ladder,
  • figure 2 : a side view of the ladder,
  • figure 3 : a detail of the ladder seen from above
  • figure 4 : a partial view of the side of the figure 3 ,
  • figure 5 : a ladder on a sloping ground,
  • Figures 6 to 8 : three variants of the invention.

En se reportant au dessin, on voit une échelle 1.Referring to the drawing, we see a scale 1.

Classiquement, une échelle 1 est constituée de deux montants 2 reliés par des traverses 3 ou échelons 3 et un contre-appui 4 articulé sur les montants 2.Classically, a ladder 1 consists of two uprights 2 connected by sleepers 3 or steps 3 and a counter-support 4 articulated on the uprights 2.

Les traverses constituent des marches.The sleepers are steps.

Comme on peut le voir dans l'exemple représenté le contre-appui 4 est constitué par un profilé maintenu à son extrémité supérieure entre les deux montants 2 précités .As can be seen in the example shown counter-support 4 is constituted by a profile maintained at its upper end between the two amounts 2 above.

Cette échelle comprend un moyen en vue de limiter l'écartement du contre-appui par rapport aux montants.This scale comprises a means for limiting the distance of the counter-support relative to the amounts.

Dans une forme de réalisation connue, s'agit d'une ou deux sangles.In a known embodiment, it is one or two straps.

Selon l'invention, l'échelle comprend à distance de son sommet A un dispositif 5 dit de verrouillage qui, en position active, s'étend dans un plan P parallèle au plan d'appui R de l'échelle et verrouille la disposition géométrique des montants 2 et du contre-appui 4.According to the invention, the scale comprises, at a distance from its vertex A, a so-called locking device 5 which, in the active position, extends in a plane P parallel to the support plane R of the scale and locks the geometric arrangement amounts 2 and counter-support 4.

Ce dispositif 5 est articulé sur les montants 2 et guidé en translation sur le contre-appui 4.This device 5 is articulated on the uprights 2 and guided in translation on the abutment support 4.

Pour simplifier la lecture, le dispositif de verrouillage 5 n'est pas représenté sur la figure 1.To simplify the reading, the locking device 5 is not represented on the figure 1 .

L'articulation du contre-appui se fait sur le haut des montants.The articulation of the counter-support is done on the top of the uprights.

Le contre-appui porte, sur sa face tournée vers les montants, une ferrure 6 légèrement écartée de la face du contre-appui derrière laquelle ferrure glisse l'extrémité d'une pièce triangulaire 5A dont la base est articulée sur l'arrière des montants.The abutment bears, on its side facing the uprights, a fitting 6 slightly spaced from the face of the abutment behind which the fitting slides the end of a triangular piece 5A whose base is hinged to the rear of the uprights .

Cette pièce 5A triangulaire est, par exemple, formée à partir d'un fil rond plié de telle sorte qu'il forme une sorte de Vé dont les extrémités libres 5C sont engagées dans des ferrures 5D portées par les montants 2 pour former une articulation.This triangular piece 5A is, for example, formed from a round wire folded so that it forms a kind of Vé whose free ends 5C are engaged in 5D fittings carried by the uprights 2 to form a hinge.

Cette pièce triangulaire 5A présente en sa partie opposée à l'articulation précitée un passant 20 qui coulisse au long de la ferrure 6 portée par le contre-appui 4.This triangular piece 5A has in its opposite portion to the aforementioned articulation a loop 20 which slides along the fitting 6 carried by the counter-support 4.

Le passant 20 peut être délimité par le fil rond et une tablette 5B s'engageant à l'intérieur du Vé de la pièce triangulaire 5A.The loop 20 may be delimited by the round wire and a tablet 5B engaging inside the Vee of the triangular piece 5A.

Il pourrait s'agir également d'un passant délimité par le fil rond destiné à former la pièce en V é et une pièce métallique rapportée sur cette pièce triangulaire.It could also be a passer defined by the round wire for forming the V e piece and a metal piece attached to this triangular piece.

Des raidisseurs 21 transversaux relient les branches du Vé pour une meilleure rigidité.Transverse stiffeners 21 connect the branches of the V e for better rigidity.

On note que la pointe 22 du Vé est inclinée par rapport au plan contenant les branches et vers le bas afin que le passant 20 coulisse avec un faible jeu de fonctionnement autour de la ferrure 6 du contre-appui.Note that the tip 22 of the Ve is inclined relative to the plane containing the branches and downwards so that the loop 20 slides with a small clearance of operation around the fitting 6 of the counter-support.

Cette ferrure 6 du contre-appui présente au moins une encoche 23 pour verrouiller en translation la pièce triangulaire 5A en position horizontale.This fitting 6 of the counter-support has at least one notch 23 to lock in translation the triangular piece 5A in horizontal position.

Une deuxième encoche est prévue pour un verrouillage en position repliée.A second notch is provided for locking in the folded position.

Ce dispositif de verrouillage permet de donner une résistance géométrique au tripode ainsi ouvert.This locking device makes it possible to give a geometrical resistance to the tripod thus opened.

On note que la face avant des montants est reliée par une plaque 24 rigidifiant l'assemblage en tête et maintenant l'axe de rotation qui est invisible.Note that the front of the uprights is connected by a plate 24 stiffening the assembly at the head and maintaining the axis of rotation which is invisible.

En rendant indéformable cette disposition en triangle et en déterminant un triangle de sustentation relativement large, l'utilisateur de l'échelle et son centre de gravité restent toujours dans le triangle de sustentation.By rendering this triangular arrangement indeformable and by determining a relatively wide support triangle, the user of the scale and its center of gravity always remain in the triangle of levitation.

Il est pratiquement impossible de verser latéralement.It is almost impossible to pour laterally.

Il faut également constater que, sur le plan ergonomique, l'utilisateur se trouve en poste de travail sur l'avant dernière marche en appui sur le plan d'accès avec pratiquement la hanche à hauteur de la haie et donc à la hauteur adéquate pour l'outil de coupe.It should also be noted that, ergonomically, the user is in workstation on the penultimate step in support of the access plan with practically the hip at the height of the hedge and therefore at the appropriate height for the cutting tool.

L'échelle ne peut basculer.The ladder can not switch.

Avantageusement, l'angle défini entre le plan défini par les montants et le contre-appui est de l'ordre de 40°.Advantageously, the angle defined between the plane defined by the amounts and the counter-support is of the order of 40 °.

L'angle V formé par les deux montants est de l'ordre de 22°.The angle V formed by the two uprights is of the order of 22 °.

La longueur du contre-appui et les angles sont déterminés pour que le centre de gravité soit plus proche du contre-appui de sorte que le poids de l'utilisateur est orienté vers le profilé 4.The length of the abutment and the angles are determined so that the center of gravity is closer to the counter-support so that the weight of the user is oriented towards the profile 4.

A cet effet, l'angle G entre le sol et le plan contenant les montants est inférieur à l'angle F entre le sol et le contre-appui.For this purpose, the angle G between the ground and the plane containing the amounts is less than the angle F between the ground and the counter-support.

Cet angle G est d'environ 65° et l'angle F de 75°.This angle G is about 65 ° and the angle F is 75 °.

On note que le fait d'utiliser un contre-appui sous forme d'un seul profilé permet d'introduire ce profilé dans la profondeur d'une haie et donc d'être plus proche de celle-ci.It is noted that the fact of using a counter-support in the form of a single profile makes it possible to introduce this profile into the depth of a hedge and therefore to be closer to it.

Avantageusement, il est prévu à la base du contre-appui un patin 7 ou sabot d'appui d'étendue largement supérieure à la section du profilé 4 de manière à pouvoir placer ce contre-appui sur un sol meuble.Advantageously, there is provided at the base of the counter-support a pad 7 or support shoe extended much greater than the section of the section 4 so as to place this counter-support on loose ground.

Pour augmenter la résistance du profilé 4 ou contre-appui 4, celui-ci est un profilé en Té.To increase the resistance of the section 4 or counter-support 4, it is a T-section.

Lorsqu'il s'agit, notamment, d'une échelle en bois, ce profilé est soit taillé dans la masse, soit constitué de deux pièces de bois assemblées.When it comes, in particular, a wooden ladder, this section is either cut in the mass, or consists of two pieces of wood assembled.

Dans une forme de réalisation, les premières traverses depuis le bas sont reliées par une barre 8 de reprise de charge évitant notamment un risque de flexion des traverses les plus longues.In one embodiment, the first sleepers from the bottom are connected by a bar 8 of load recovery avoiding in particular a risk of bending of the longer sleepers.

Avantageusement, la face de cette barre 8 tournée vers le contre-appui présentera une rainure pour y loger partiellement le contre-appui.Advantageously, the face of this bar 8 facing the counter-support will present a groove to partially accommodate the counter-support.

L'arrière de cette barre 8 pourra être pourvue d'un moyen d'accrochage du profilé tel un système boucles et crochets, lequel pourra être partiellement logé dans la rainure précitée.The rear of this bar 8 may be provided with a fastening means of the profile such as a system loops and hooks, which may be partially housed in the aforementioned groove.

Selon l'invention, le contre-appui 4 est de longueur variable en sorte qu'on puisse maintenir l'horizontalité des marches même si le sol est pentu dans un sens ou dans l'autre.According to the invention, the counter-support 4 is of variable length so that the horizontality of the steps can be maintained even if the ground is sloping in one direction or the other.

Il comprend donc un moyen 40 de réglage.It therefore comprises a means 40 of adjustment.

Bien évidemment, il faut placer son échelle dans le sens de la pente et non en dévers.Of course, you have to place your ladder in the direction of the slope and not on the slope.

Dans une première solution, le contre-appui 4 est formé d'au moins un élément télescopique avec un moyen de verrouillage 41, soit pas par pas, soit en tout point.In a first solution, the counter-support 4 is formed of at least one telescopic element with a locking means 41, either stepwise or at any point.

Suivant le matériau employé, le contre-appui 4 peut être constitué de deux tubes emboîtés mais une solution plus résistante et permettant de mettre en oeuvre des profilés plein est décrite ci-après.Depending on the material used, the counter-support 4 may consist of two nested tubes but a more resistant solution and to implement full profiles is described below.

Dans une forme de réalisation, le contre-appui 4 comprend, d'une part, une branche principale 4A qui, s'étendant depuis le haut de l'échelle, est de longueur inférieure à celle des montants et, d'autre part, une branche 4B secondaire constituée de deux profilés maintenus écartés par des pattes 4D, cette branche secondaire venant coiffer la branche principale.In one embodiment, the abutment 4 comprises, on the one hand, a main branch 4A which, extending from the top of the ladder, is of shorter length than the uprights and, on the other hand, a secondary branch 4B consists of two sections held apart by 4D legs, this secondary branch to cap the main branch.

Des trous 50 dans les deux branches viennent en coïncidence permettant d'y introduire une goupille 51 et ainsi de verrouiller la translation des branches.Holes 50 in the two branches come into coincidence to introduce a pin 51 and thus to lock the translation of the branches.

Dans une forme de réalisation, le contre-appui 4 comprend, d'une part, une branche principale 4A qui, s'étendant depuis le haut de l'échelle, est de longueur inférieure à celle des montants et, d'autre part, une branche 4B secondaire constituée par un profilé présentant une rainure 4E longitudinale venant loger la branche principale, une ou plusieurs pattes venant fermer l'entrée de la rainure pour maintenir la seconde branche sur la première.In one embodiment, the abutment 4 comprises, on the one hand, a main branch 4A which, extending from the top of the ladder, is of shorter length than the uprights and, on the other hand, a secondary branch 4B consisting of a profile having a longitudinal groove 4E coming to house the main branch, one or more tabs closing the entrance of the groove to maintain the second branch on the first.

Avantageusement, on utilisera une première branche 4A ayant une section en Té en sorte que les faces intérieures 4G de la branche horizontale du Té participent au guidage.Advantageously, use a first branch 4A having a T-section so that the inner faces 4G of the horizontal arm of the T participate in guiding.

De telles solutions permettent de réaliser un contre-appui de longueur variable avec tous les types de matériau, tels le bois, les composites, l'aluminium etc ...Such solutions make it possible to provide a counter-support of variable length with all types of material, such as wood, composites, aluminum, etc.

Les longueurs des branches seront déterminées pour que la longueur du contre-appui puisse être inférieure à la longueur des montants ou être supérieure.The lengths of the branches will be determined so that the length of the counter-support may be shorter than the length of the uprights or be greater.

La plage de variation pourra être de l'ordre du mètre voire plus.The range of variation may be of the order of a meter or more.

L'homme du métier est à même de choisir cette plage.The skilled person is able to choose this beach.

Claims (5)

  1. An adjustable ladder comprising two uprights (2) interconnected by cross-members (3) or rungs (3), and a prop (4) hinged to the uprights (2), the prop (4) being of variable length, the ladder including, at a distance from its top (A), a locking device (5) comprising a connection part forming a plane that is hinged to the uprights (2), said ladder being characterized in that the plane of the connection part is guided to move in translation along the prop (4), said locking device, in the active position, always extending in a plane (P) parallel to the support plane (R) of the ladder regardless of the angle of inclination of said support plane (R) and locking the geometrical configuration of the uprights (2) and of the prop (4).
  2. A ladder according to claim 1, characterized in that the prop (4) is formed by at least one telescopic element with locking means (41), operating either stepwise or continuously.
  3. A ladder according to claim 2, characterized in that the prop (4) comprises firstly a main branch (4A) that extends from the top of the ladder over a length that is shorter than the length of the uprights, and secondly a secondary branch (4B) constituted by two section members spaced apart by tabs (4D), said secondary branch overlying the main branch.
  4. A ladder according to claim 2, characterized in that the prop (4) comprises firstly a main branch (4A) that extends from the top of the ladder over a length that is shorter than the length of the uprights, and secondly a secondary branch (4B) constituted by a section member presenting a longitudinal groove (4E) receiving the main branch, one or more tabs (4F) closing the inlet of the groove in order to hold the second branch on the first.
  5. A ladder according to claim 2, characterized in that the prop (4) comprises firstly a main branch (4A) that extends from the top of the ladder over a length that is shorter than the length of the uprights, and secondly a secondary branch (4B), the first branch (4A) comprising a T-section member such that the inside faces (4G) of the horizontal branch of the T-shape contribute to guidance.
EP03370036A 2002-11-04 2003-10-31 Adjustable ladder Expired - Lifetime EP1416117B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0213729A FR2846702B1 (en) 2002-11-04 2002-11-04 ADJUSTABLE SCALE
FR0213729 2002-11-04

Publications (2)

Publication Number Publication Date
EP1416117A1 EP1416117A1 (en) 2004-05-06
EP1416117B1 true EP1416117B1 (en) 2008-12-17

Family

ID=32088436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03370036A Expired - Lifetime EP1416117B1 (en) 2002-11-04 2003-10-31 Adjustable ladder

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Country Link
EP (1) EP1416117B1 (en)
AT (1) ATE417991T1 (en)
DE (1) DE60325318D1 (en)
FR (1) FR2846702B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0807913D0 (en) * 2008-05-01 2008-06-04 Baglin Neil E Ladder construction
CN102936995A (en) * 2012-11-30 2013-02-20 柴敬博 Annular ladder
CN103266849A (en) * 2013-06-13 2013-08-28 苏州新区华士达工程塑胶有限公司 Insulated engineering plastic folding ladder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US548670A (en) * 1895-10-29 Step-ladder
US1259239A (en) * 1917-10-03 1918-03-12 Conradin Jecklin Orchard-ladder.
DE9116598U1 (en) * 1991-12-02 1993-05-27 Böhle, Christian, 3548 Arolsen Device for supporting a telescopic ladder

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US1670653A (en) * 1926-06-28 1928-05-22 Frederick Backlund Stepladder
US1729033A (en) * 1927-09-19 1929-09-24 Czischke John Fred Ladder
US2396813A (en) * 1944-06-12 1946-03-19 Frank J Benz Ladder
US2662680A (en) * 1951-10-01 1953-12-15 Lawrence E Bronson Stepladder
GB1012669A (en) * 1963-06-18 1965-12-08 Stephens & Carter Ltd Improvements in and relating to ladders
AU478206B2 (en) * 1972-08-28 1975-02-27 Charles Smith Francis Improvements in section shape of stiles of extension ladders
DE4402760A1 (en) * 1994-01-07 1994-10-27 Dietmar Boehl Three-legged free-standing ladder with a variable-length standing foot
US5590739A (en) * 1994-11-01 1997-01-07 High; Dewayne A. Adjustable extension stepladder
GB2327973A (en) * 1997-08-06 1999-02-10 Evan Garnett William Multi - purpose three - legged stepladder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US548670A (en) * 1895-10-29 Step-ladder
US1259239A (en) * 1917-10-03 1918-03-12 Conradin Jecklin Orchard-ladder.
DE9116598U1 (en) * 1991-12-02 1993-05-27 Böhle, Christian, 3548 Arolsen Device for supporting a telescopic ladder

Also Published As

Publication number Publication date
ATE417991T1 (en) 2009-01-15
EP1416117A1 (en) 2004-05-06
FR2846702A1 (en) 2004-05-07
FR2846702B1 (en) 2006-01-20
DE60325318D1 (en) 2009-01-29

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