EP1584773A1 - Tripod stand for legs of scaffolding and feet of ladder with automatic level correction on very irregular ground - Google Patents

Tripod stand for legs of scaffolding and feet of ladder with automatic level correction on very irregular ground Download PDF

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Publication number
EP1584773A1
EP1584773A1 EP05352006A EP05352006A EP1584773A1 EP 1584773 A1 EP1584773 A1 EP 1584773A1 EP 05352006 A EP05352006 A EP 05352006A EP 05352006 A EP05352006 A EP 05352006A EP 1584773 A1 EP1584773 A1 EP 1584773A1
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EP
European Patent Office
Prior art keywords
tube
axis
axes
legs
feet
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EP05352006A
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German (de)
French (fr)
Inventor
Frédéric Ladurée
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Individual
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Individual
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G5/00—Component parts or accessories for scaffolds
    • E04G5/02—Scaffold feet, e.g. with arrangements for adjustment
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
    • E04G2001/248—Inclined struts

Definitions

  • the present invention relates to a device for wedging the legs of scaffolds of building construction and especially scaffolding during various works on walls.
  • the device can also be used for scale jobs.
  • the assembly of these scaffolding is traditionally carried out on irregular bearing soils, presenting either slopes, or projections between street and sidewalk for example.
  • Scaffold leg rigging is currently done with various means, usually wooden planks in order to make up for the horizontality of the ground. This brings a vertical wedging of scaffolding without any mechanical connection between the legs of scaffolding, wooden wedges and soil.
  • the support feet automatically adapt to the terrain configuration.
  • This tripod can be used too on flat ground to fit the feet of a ladder in its tube. We will have an inclination wanted between the tube and the ground to press the ladder to the wall in its upper part.
  • the rigid links (6a) and (6b) can be replaced by cables of equal or different length for simplification of manufacture.
  • a rising cable will cross for example two parallel cables descending or conversely thus ensuring perfectly their crossing. These cables will be protected by protective guides to their cross.
  • the outer ring (22) of adequate section will be designed with fasteners (12a) (12b) and (12c) at 120 ° on its periphery to support the support feet (5a), (5b), and (5c) by the intermediate axes (14a), (14b) and (14c) allowing the mobility of the support feet (5a), (5b) and (5c).
  • the bearing feet (5a), (5b) and (5c) have soles (7a) at their lower end, (7b) and (7c) in contact with the ground, mounted on axes allowing a few degrees of travel.
  • the soles (7a), (7b) and (7c) will be of different surfaces depending on the nature of the ground. On hard ground we will have soles with a non-slip rubberized protection fused from below. On soft ground, the soles surface will be larger with grip cleats for example.
  • the device FIG. 3 comprises a tube (10) having in its part superior three same fasteners positioned at 120 ° between them on the circumference of the tube (10) one of which (9a) FIG. 3 allows the articulation of the rod (6a).
  • the tube (10) has in its lower part three same fastening fasteners positioned at 120 ° between them on the circumference of the tube (10) of which one (9b) Fig.2 allows the articulation of the link (6b).
  • a first inner ring (21) is maintained at this last by two axes (1a) and (2b) which intersect at 90 ° in the same plane.
  • the axis (1a) goes to through two diametrically opposed holes (3) in the tube (10) and is free to rotate in these same holes.
  • the axis (2b) can be in three parts: two bolts - axes (4a) and (4b) are screwed symmetrically on a central part (4). 7, breakthrough at its center for allow the sliding and rotation of the axis (1a).
  • the axis (2b) 2 is not in solidarity with tube (10). It passes through two vertical slots (1) and diametrically opposed by relative to the axis of the tube (10).
  • the inner ring (21) serves to guide and reinforce the axis (2b).
  • a second outer ring (22) Fig. 2 lies around the first crown internal (21) and in the same plane.
  • the outer ring (22) is of greater diameter and is secured to the inner ring (21) via the axis (2b).
  • a free space is arranged between the rings (21) and (22). 3, to allow the crossing of the links (6a) and (6b).
  • This universal joint assembly allows the outer ring (22) Fig.2 its free displacement relative to the tube (10). We obtain an oscillatory movement of the crown external (22) relative to the tube (10).
  • the outer ring (22) Fig.2 has three pairs of fasteners (12a), (12b) and (12c) 120 ° on its circumference to maintain the three support feet (5a), (5b) and (5c). by via axes of rotation (14a), (14b) and (14c) allowing vertical deflection bearing feet (5a), (5b) and (5c) relative to the outer ring (22).
  • a half-moon (8) whose ends have two fasteners (8a) and (8b) to hold the links (6a) and (6b).
  • Each pair of links (6a) and (6b) is associated with a single foot support (5b).
  • the link (6a) is held at the upper attachment (9a) on the tube (10) and at its another end to the lower fastening (8a) of the half-moon (8) of the support foot (5b).
  • the link (6b) Fig.4 is held at the lower attachment (9b) on the tube (10) and at its other end to the high fixation (8b) of the half-moon (8) of the support foot (5b).
  • the drawing Fig.6 explains the operation of the tripod device
  • the tube (10) When placing the tripod on uneven ground with a slope or sidewalk, the tube (10) is found perpendicular to the direction of the slope. It will be enough to straighten vertically the tube (10) Fig.6 which performs a rocker around its center R Fig.6 and by the crossed play of the links (6a) and (6b) will constrain the triangle materialized by the axis (14a) Fig.6 and the two fixing pins (8a) and (8b) on the half-moon (8) to rotate in the vertical plane.
  • the mobility of the outer ring (22) by universal joint around the tube (10) allows the shaft (14a) to lift.
  • the support foot (5a) being integral with the three points fastening in rotation (8a) (8b) and (14a) forming a triangle, rises upstream of the slope. By symmetry is the other support foot (5a ') which is lowered downstream of the slope.
  • the outer ring (22) tends to follow in parallel the direction of the slope of the ground on which the device is placed when the tube (10) is vertical.
  • the central tube (10) directs automatically the inclination of the support feet (5a) and (5a '). If we maintain vertically the tube (10) thanks to the scaffolding leg fitted in the latter vertically, we have, by reaction of the ground on the support feet (5a) and (5a ') the device which comes to rest in adapting to uneven ground.
  • the device makes it possible to support the scaffolding without the contribution of various wooden wedges to create a stable and secure seat.
  • This tripod can be about thirty centimeters high on a diameter of forty centimeters at the soles. It is particularly useful for straight legs scaffolding but it can be used for ladders, trestles, etc ...

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Ladders (AREA)

Abstract

The tripod has an inner rim (21) held at a tube (10) by rotational axes. Upper ends of three small supporting legs (5a-5c) are fixed at 120 degrees, on an outer part of an outer rim (22). Each leg is connected to a central tube by rigid articulated rods that pass in free space between the rims. The legs in upstream and downstream of sloped ground, are raised up and pulled down, respectively, in order to obtain verticality of the tube.

Description

La présente invention concerne un dispositif pour caler les jambes des échafaudages de construction en bâtiment et particulièrement des échafaudages lors de divers travaux sur les murs. Le dispositif peut être utilisé aussi pour les travaux à l'échelle. Le montage de ces échafaudages est traditionnellement effectué sur des sols d'appui irréguliers, présentant soit des pentes, soit des ressauts entre rue et trottoir par exemple.The present invention relates to a device for wedging the legs of scaffolds of building construction and especially scaffolding during various works on walls. The device can also be used for scale jobs. The assembly of these scaffolding is traditionally carried out on irregular bearing soils, presenting either slopes, or projections between street and sidewalk for example.

Le calage des jambes d'échafaudage se fait actuellement avec divers moyens, en général des planches en bois afin de rattraper approximativement l'horizontalité du sol. Ceci amène un calage vertical des échafaudages sans aucune liaison mécanique entre les jambes de l'échafaudage, les cales en bois et le sol.Scaffold leg rigging is currently done with various means, usually wooden planks in order to make up for the horizontality of the ground. This brings a vertical wedging of scaffolding without any mechanical connection between the legs of scaffolding, wooden wedges and soil.

Le dispositif, selon l'invention, permet de remédier en partie à cet inconvénient en interposant un trépied entre les jambes d'un échafaudage et le sol. Ce trépied comprend essentiellement :

  • 1ère caractéristique : un tube central de section ronde sera dressé verticalement et supportera les jambes de l'échafaudage par emmanchement des jambes dans ce tube. Ce tube est traversé d'une part par deux fentes opposées symétriquement dans sa partie basse, et d'autre part par deux trous permettant le passage d'un axe.
  • 2ème caractéristique : deux couronnes de circonférence et de section différentes sont emboítées l'une dans l'autre sur un même plan et maintenues entre elles par un axe médian dans ce même plan, leur conférant une certaine mobilité entre elles par rotation sur l'axe. Ces deux couronnes sont satellisées autour du tube et maintenues au bas du tube par un autre axe perpendiculaire au tube laissant libre le débattement entre le tube et les deux couronnes. L'ensemble forme un joint de cardan assurant un débattement multidirectionnel oscillatoire entre le tube et la grande couronne extérieure.
  • 3ème caractéristique : trois pieds d'appui dont les extrémités supérieures sont fixées à 120° entre elles, à la partie externe de la grande couronne. La fixation se fait par un axe de rotation entre couronnes et pieds d'appui, permettant leur libre débattement. Les extrémités basses des pieds d'appui reposent sur le sol par l'intermédiaire de semelles. Lorsque le trépied est en position de repos, les pieds forment un angle obtus avec le plan de la couronne externe.
  • 4ème caractéristique : chaque pied d'appui est relié au tube central par l'intermédiaire de biellettes qui se croisent dans l'espace laissé libre entre la première couronne interne et la deuxième couronne externe. Ces biellettes d'articulation pourront être rigides ou remplacées par des câbles. Ainsi, lorsque le trépied est posé sur un sol irrégulier ou en pente, (ressaut de trottoir par exemple), le fait d'emmancher la jambe d'un échafaudage dans le trépied ramènera le tube du trépied à la verticale par solidarité avec la jambe de l'échafaudage.
The device according to the invention makes it possible to partially remedy this disadvantage by interposing a tripod between the legs of a scaffolding and the ground. This tripod essentially comprises:
  • 1 characteristic era: a central tube of round cross-section and is drawn vertically to bear the legs of the scaffolding by fitting the legs into the tube. This tube is traversed on the one hand by two symmetrically opposed slots in its lower part, and on the other hand by two holes allowing the passage of an axis.
  • 2nd characteristic: two crowns of different circumference and section are nested one inside the other on the same plane and held together by a median axis in the same plane, giving them a certain mobility between them by rotation on the axis. These two crowns are orbited around the tube and held at the bottom of the tube by another axis perpendicular to the tube leaving free movement between the tube and the two rings. The assembly forms a universal joint providing oscillatory multidirectional deflection between the tube and the large outer ring.
  • 3rd feature: three feet support the upper ends are fixed at 120 ° therebetween, the outer portion of the crown wheel. Fixing is done by an axis of rotation between crowns and support feet, allowing their free movement. The lower ends of the support legs rest on the ground via soles. When the tripod is in the rest position, the feet form an obtuse angle with the plane of the outer ring.
  • 4 th feature: each supporting foot is connected to the central tube by means of rods which intersect in the space left between the first inner ring and the second outer ring. These link rods may be rigid or replaced by cables. For example, when the tripod is placed on an uneven or sloping ground, such as a sidewalk, pushing the leg of a scaffold into the tripod will bring the tripod tube upright in solidarity with the leg. scaffolding.

Dans un système classique de trépied fixe on aurait forcément un ou deux pieds d'appui se soulevant du sol. Dans notre système, par l'intermédiaire du tube, des couronnes et des biellettes, on aura un repositionnement automatique des trois pieds d'appui sur le sol en pente, ce qui contribuera ainsi à la stabilité de l'échafaudage.In a conventional fixed tripod system one would necessarily have one or two feet of support lifting from the ground. In our system, through the tube, crowns and rods, we will have an automatic repositioning of the three feet of support on the ground in slope, thereby contributing to the stability of the scaffolding.

Les pieds d'appui en amont de la pente se soulèveront et par opposition, ceux en aval, s'abaisseront de façon à obtenir la verticalité du tube de chaque trépied. L'ensemble de l'échafaudage et des trépieds forme un système stable sans l'apport de diverses cales en bois. Plus le terrain est en forte déclivité, plus le centre de gravité du trépied tend à s'abaisser, conférant au système de calage une meilleure stabilité. Il suffira de régler la hauteur de chaque jambe de l'échafaudage par rapport à sa plate-forme de travail. La combinaison de pieds d'appui de courte longueur et de débattement très important de ces derniers jusqu'à l'horizontale permet de compenser de très forts dénivelés de terrain. Même si le sol porteur tend à se modifier sous le poids de l'échafaudage ou autre , le trépied se réajustera automatiquement au terrain sans déplacement latéral de son axe vertical passant par son centre de gravité. Il n'est pas nécessaire pour un échafaudage d'utiliser autant de trépieds que de jambes.The feet of support upstream of the slope will rise and in opposition, those downstream, will lower to obtain the verticality of the tube of each tripod. All the scaffolding and tripods form a stable system without the contribution of various wooden wedges. The steeper the terrain, the more the tripod's center of gravity tends to lower. giving the rigging system better stability. It will be sufficient to adjust the height of each leg of the scaffold with respect to its working platform. The combination of support feet of short length and very important deflection of these up to the horizontal makes it possible to compensate for very uneven terrain. Even if the carrier soil tends to change under the weight of scaffolding or otherwise, the tripod will readjust automatically to the terrain without lateral displacement of its vertical axis passing through its center of gravity. There is no need for scaffolding to use as many tripods only legs.

Quelque soit la position du trépied sur un sol irrégulier (rotation), les pieds d'appui s'adaptent automatiquement à la configuration du terrain. Ce trépied peut être utilisé aussi sur sol plat pour emmancher les pieds d'une échelle dans son tube. On aura une inclinaison voulue entre le tube et le sol pour plaquer l'échelle au mur dans sa partie haute.Whatever the position of the tripod on uneven ground (rotation), the support feet automatically adapt to the terrain configuration. This tripod can be used too on flat ground to fit the feet of a ladder in its tube. We will have an inclination wanted between the tube and the ground to press the ladder to the wall in its upper part.

Pour une échelle munie d'élargisseurs latéraux à sa base et placée dans une rue à forte déclivité, l'utilisation du trépied permet de corriger simultanément, l'angle normal d'une échelle adossée au mur du bâtiment, l'angle de déclivité de la rue et l'angle de ressaut du trottoir par exemple.For a ladder equipped with lateral wideners at its base and placed in a high street the use of the tripod makes it possible to simultaneously correct the normal angle of ladder leaned against the wall of the building, the angle of declivity of the street and the angle of sidewalk for example.

Les dessins annexes illustrent l'invention :

  • la figure 1 représente le dispositif d'invention.
  • la figure 2 représente vue du dessus la coupe du dispositif d'invention (Fig.1) au niveau des axes de rotation. Les trois paires de biellettes ne sont pas représentées sur ce schéma.
  • la figure 3 représente en coupe selon AA le dispositif Fig. 2
  • la figure 4 représente en coupe selon BB le dispositif Fig. 2
  • la figure 5 représente en coupe selon CC le dispositif Fig. 2
  • la figure 6 représente en coupe le dispositif d'invention (Fig.2) dont un pied d'appui serait ramené par rotation de 60° en face d'un autre pied d'appui existant. Ce système plan virtuel ne comprenant que deux pieds d'appui opposé à 180°, sert uniquement à comprendre le fonctionnement dans l'espace du système d'invention.
  • la figure 7 représente les axes.
The accompanying drawings illustrate the invention:
  • Figure 1 shows the device of invention.
  • FIG. 2 represents a view from above of the section of the invention device (FIG. 1) at the axes of rotation. The three pairs of links are not shown in this diagram.
  • 3 shows in section along AA the device FIG. 2
  • Figure 4 shows in section along BB the device FIG. 2
  • FIG. 5 is a sectional view along CC of the device FIG. 2
  • Figure 6 shows in section the invention device (Fig.2) including a support foot would be brought by rotation of 60 ° in front of another existing support foot. This virtual plane system comprising only two support feet opposite to 180 °, serves only to understand the operation in the space of the invention system.
  • Figure 7 shows the axes.

Selon des modes particuliers de réalisation :

  • Le tube (10) peut avoir une vis sans fin ou un filetage intérieur, ou des trous avec clavettes pour permettre le réglage en hauteur des jambes d'échafaudage.
  • La couronne interne (21) peut présenter plusieurs formes de section selon des types de fabrication. Elle est maintenue au tube (10) par deux axes de rotation (1a) et (1b) se croisant à 90° et libres entre eux.
  • Le corps des pieds d'appui peut être en un ou plusieurs parties articulées ou vissées entre elles.
  • Une coupole plastique autour du tube protégera les couronnes et leurs mécanismes des salissures de chantier.
  • Les biellettes (6a) et (6b) sont rigides, de longueur égale ou différente et terminées à leurs extrémités par un système d'articulation de type axe/rotule par exemple.
According to particular embodiments:
  • The tube (10) may have a worm or an internal thread, or keyholes to allow height adjustment of the scaffolding legs.
  • The inner ring (21) may have several sectional shapes according to types of manufacture. It is held in the tube (10) by two axes of rotation (1a) and (1b) crossing at 90 ° and free between them.
  • The body of the support legs may be in one or more articulated parts or screwed together.
  • A plastic dome around the tube will protect the crowns and their mechanisms from construction stains.
  • The rods (6a) and (6b) are rigid, of equal or different length and terminated at their ends by a hinge type system axis / patella for example.

L'une des biellettes devra posséder un chas dans sa partie centrale dans lequel l'autre biellette passera, afin de permettre leur croisement libre dans un même plan et un certain débattement latéral. Les biellettes (6a) et (6b) rigides peuvent être remplacées par des câbles de longueur égale ou différente pour simplification de fabrication. Un câble montant croisera par exemple deux câbles parallèles descendants ou inversement assurant ainsi parfaitement leur croisement. Ces câbles seront protégés par des guides de protection à leur croisée.One of the links must have an eye in its central part in which the other rod will pass, to allow their free crossing in the same plane and a certain lateral deflection. The rigid links (6a) and (6b) can be replaced by cables of equal or different length for simplification of manufacture. A rising cable will cross for example two parallel cables descending or conversely thus ensuring perfectly their crossing. These cables will be protected by protective guides to their cross.

La couronne externe (22) de section adéquate sera conçue avec des fixations (12a) (12b) et (12c) à 120° sur son pourtour pour supporter les pieds d'appui (5a), (5b), et (5c) par l'intermédiaire d'axes (14a), (14b) et (14c) permettant la mobilité des pieds d'appui (5a), (5b) et (5c).The outer ring (22) of adequate section will be designed with fasteners (12a) (12b) and (12c) at 120 ° on its periphery to support the support feet (5a), (5b), and (5c) by the intermediate axes (14a), (14b) and (14c) allowing the mobility of the support feet (5a), (5b) and (5c).

Les pieds d'appui (5a), (5b) et (5c) comportent en leur extrémité basse des semelles (7a), (7b) et (7c) en contact avec le sol, montées sur des axes permettant quelques degrés de débattement. Les semelles (7a), (7b) et (7c) seront de différentes surfaces selon la nature du sol. Sur sol dur on aura des semelles avec une protection caoutchoutée antidérapante thermocollée par dessous. Sur sol meuble, la surface des semelles sera plus grande avec des crampons d'adhérence par exemple.The bearing feet (5a), (5b) and (5c) have soles (7a) at their lower end, (7b) and (7c) in contact with the ground, mounted on axes allowing a few degrees of travel. The soles (7a), (7b) and (7c) will be of different surfaces depending on the nature of the ground. On hard ground we will have soles with a non-slip rubberized protection fused from below. On soft ground, the soles surface will be larger with grip cleats for example.

En référence à ces dessins, le dispositif Fig. 3 comporte un tube (10) possédant dans sa partie supérieure trois mêmes attaches de fixation positionnées à 120° entre elles sur la circonférence du tube (10) dont l'une (9a) Fig. 3 permet l'articulation de la biellette (6a). Le tube (10) possède dans sa partie basse trois même attaches de fixation positionnées à 120° entre elles sur la circonférence du tube (10) dont l'une (9b) Fig.2 permet l'articulation de la biellette (6b).With reference to these drawings, the device FIG. 3 comprises a tube (10) having in its part superior three same fasteners positioned at 120 ° between them on the circumference of the tube (10) one of which (9a) FIG. 3 allows the articulation of the rod (6a). The tube (10) has in its lower part three same fastening fasteners positioned at 120 ° between them on the circumference of the tube (10) of which one (9b) Fig.2 allows the articulation of the link (6b).

A la périphérie du tube (10), Fig. 2, une première couronne interne (21) est maintenue à ce dernier par deux axes (1a) et (2b) qui se croisent à 90° dans le même plan. L'axe (1a) passe à travers deux trous (3) diamétralement opposés dans le tube (10) et, est libre de rotation dans ces même trous. L'axe (2b) peut être en trois parties : deux boulons - axes (4a) et (4b) se vissent symétriquement sur une partie centrale (4) Fig. 7, percée en son centre pour permettre le coulissement et la rotation de l'axe (1a). L'axe (2b) Fig. 2, n'est pas solidaire du tube (10). Il passe à travers deux fentes ( 1 ) verticales et diamétralement opposées par rapport à l'axe du tube (10). Cela permet le croisement et le débattement libres de l'axe (2b) par rapport au tube (10). La couronne interne (21) permet de guider et de renforcer l'axe (2b). Une deuxième couronne externe (22) Fig. 2, se trouve autour de la première couronne interne (21) et dans le même plan. La couronne externe (22) est de diamètre supérieure et est solidaire de la couronne interne (21) par l'intermédiaire de l'axe (2b). On aura avec ce montage une rotation croisée entre les deux couronnes (21) et (22). Un espace libre est ménagé entre les couronnes (21) et (22) Fig. 3, pour permettre le croisement des biellettes (6a) et (6b).At the periphery of the tube (10), FIG. 2, a first inner ring (21) is maintained at this last by two axes (1a) and (2b) which intersect at 90 ° in the same plane. The axis (1a) goes to through two diametrically opposed holes (3) in the tube (10) and is free to rotate in these same holes. The axis (2b) can be in three parts: two bolts - axes (4a) and (4b) are screwed symmetrically on a central part (4). 7, breakthrough at its center for allow the sliding and rotation of the axis (1a). The axis (2b) 2, is not in solidarity with tube (10). It passes through two vertical slots (1) and diametrically opposed by relative to the axis of the tube (10). This allows free crossing and deflection of the axis (2b) relative to the tube (10). The inner ring (21) serves to guide and reinforce the axis (2b). A second outer ring (22) Fig. 2, lies around the first crown internal (21) and in the same plane. The outer ring (22) is of greater diameter and is secured to the inner ring (21) via the axis (2b). We will have with this mounting a cross rotation between the two rings (21) and (22). A free space is arranged between the rings (21) and (22). 3, to allow the crossing of the links (6a) and (6b).

Cet assemblage à joints de cardans permet à la couronne externe (22) Fig.2 son libre déplacement par rapport au tube (10). On obtient un mouvement oscillatoire de la couronne externe (22) par rapport au tube (10).This universal joint assembly allows the outer ring (22) Fig.2 its free displacement relative to the tube (10). We obtain an oscillatory movement of the crown external (22) relative to the tube (10).

La couronne externe (22) Fig.2 possède trois paires de fixations (12a), (12b) et (12c) à 120° sur sa circonférence pour maintenir les trois pieds d'appui (5a), (5b) et (5c). par l'intermédiaire d'axes de rotation (14a), (14b) et (14c) permettant le débattement vertical des pieds d'appui(5a), (5b) et (5c) par rapport à la couronne externe (22).The outer ring (22) Fig.2 has three pairs of fasteners (12a), (12b) and (12c) 120 ° on its circumference to maintain the three support feet (5a), (5b) and (5c). by via axes of rotation (14a), (14b) and (14c) allowing vertical deflection bearing feet (5a), (5b) and (5c) relative to the outer ring (22).

Au niveau de chaque pied d'appui (5b) Fig. 4 on trouve à la partie haute du pied, une demi-lune (8) dont les extrémités possèdent deux fixations (8a) et (8b) pour maintenir les biellettes (6a) et (6b). Chaque paire de biellettes (6a) et (6b) est associée à un seul pied d'appui (5b). La biellette (6a) est maintenue à la fixation haute (9a) sur le tube (10) et à son autre extrémité à la fixation basse (8a) de la demi-lune (8) du pied d'appui (5b). La biellette (6b) Fig.4, est maintenue à la fixation basse (9b) sur le tube (10) et à son autre extrémité à la fixation haute (8b) de la demi-lune (8) du pied d'appui (5b). On obtient un point de croisement des biellettes (6a) et (6b) dans l'espace laissé libre entre la couronne interne(21) et la couronne externe (22). Il est bon de rappeler que l'une des biellettes (6a) possède un chas permettant le croisement avec la biellette (6b) dans le même plan vertical.At each support foot (5b) Fig. 4 at the top of the foot, a half-moon (8) whose ends have two fasteners (8a) and (8b) to hold the links (6a) and (6b). Each pair of links (6a) and (6b) is associated with a single foot support (5b). The link (6a) is held at the upper attachment (9a) on the tube (10) and at its another end to the lower fastening (8a) of the half-moon (8) of the support foot (5b). The link (6b) Fig.4, is held at the lower attachment (9b) on the tube (10) and at its other end to the high fixation (8b) of the half-moon (8) of the support foot (5b). We get a point of crossing rods (6a) and (6b) in the space left free between the inner ring (21) and the outer ring (22). It is worth remembering that one of the links (6a) has a eye allowing the crossing with the rod (6b) in the same vertical plane.

Le dessin Fig.6 explique le fonctionnement du dispositif de trépiedThe drawing Fig.6 explains the operation of the tripod device

Pour cela, on a ramené virtuellement deux des trois pieds d'appui (5a) et (5b) de la Fig. 2 dans le même plan sur le dessin Fig.6. Le pied d'appui (5b) Fig.2 devient le pied d'appui virtuel (5a') Fig.6.For this, we virtually reduced two of the three support feet (5a) and (5b) of FIG. 2 in the same plane on the drawing Fig.6. The support foot (5b) Fig.2 becomes the support foot virtual (5a ') Fig.6.

Lorsqu'on pose le trépied sur un sol dénivelé présentant une pente ou un ressaut de trottoir, le tube (10) se retrouve perpendiculaire au sens de la pente. Il suffira de redresser verticalement le tube (10) Fig.6 qui effectue une bascule autour de son centre R Fig.6 et par le jeu croisé des biellettes (6a) et (6b) contraindra le triangle matérialisé par l'axe (14a) Fig.6 et les deux axes de fixation (8a) et (8b) sur la demi-lune (8) à effectuer une rotation dans le plan vertical. La mobilité de la couronne externe (22) par joint de cardan autour du tube (10) permet à l'axe (14a) de se soulever. Le pied d'appui (5a) étant solidaire des trois points de fixation en rotation (8a) (8b) et (14a) formant triangle, se soulève en amont de la pente. On a par symétrie l'autre pied d'appui (5a') qui s'abaisse en aval de la pente. On observe que la couronne externe (22) tend à suivre parallèlement le sens de la pente du terrain sur lequel est posé le dispositif, lorsque le tube (10) est vertical. On note que le tube (10) central dirige automatiquement l'inclinaison des pieds d'appui (5a) et (5a'). Si on maintient verticalement le tube (10) grâce à la jambe d'échafaudage emmanché dans ce dernier verticalement, on a, par réaction du sol sur les pieds d'appui (5a) et (5a') le dispositif qui s'immobilise en s'adaptant au sol irrégulier. Le dispositif permet de supporter l'échafaudage sans l'apport de diverses cales en bois pour créer une assise stable et sécurisée.When placing the tripod on uneven ground with a slope or sidewalk, the tube (10) is found perpendicular to the direction of the slope. It will be enough to straighten vertically the tube (10) Fig.6 which performs a rocker around its center R Fig.6 and by the crossed play of the links (6a) and (6b) will constrain the triangle materialized by the axis (14a) Fig.6 and the two fixing pins (8a) and (8b) on the half-moon (8) to rotate in the vertical plane. The mobility of the outer ring (22) by universal joint around the tube (10) allows the shaft (14a) to lift. The support foot (5a) being integral with the three points fastening in rotation (8a) (8b) and (14a) forming a triangle, rises upstream of the slope. By symmetry is the other support foot (5a ') which is lowered downstream of the slope. We observe that the outer ring (22) tends to follow in parallel the direction of the slope of the ground on which the device is placed when the tube (10) is vertical. It is noted that the central tube (10) directs automatically the inclination of the support feet (5a) and (5a '). If we maintain vertically the tube (10) thanks to the scaffolding leg fitted in the latter vertically, we have, by reaction of the ground on the support feet (5a) and (5a ') the device which comes to rest in adapting to uneven ground. The device makes it possible to support the scaffolding without the contribution of various wooden wedges to create a stable and secure seat.

Cette démonstration, ramenée à notre dispositif de trépied Fig.1, ne change rien à son fonctionnement aux trois pieds d'appui (5a), (5b) et (5c) positionnés à 120° les uns des autres. Le dispositif fonctionne comme si chacun des trois pieds d'appui (5a), (5b) et (5c), avait son pied d'appui symétrique (5a'), (5b') et (5c'), l'ensemble créant un dispositif virtuel à 6 pieds d'appui (5a), (5b), (5c), (5a'), (5b') et (5c') décalés à 60° entre eux dans le même plan horizontal. This demonstration, brought back to our tripod device Fig.1, does not change anything to its operating at three support feet (5a), (5b) and (5c) positioned at 120 ° any of the other. The device functions as if each of the three support feet (5a), (5b) and (5c), had its symmetrical support foot (5a '), (5b') and (5c '), the set creating a virtual device at 6 support feet (5a), (5b), (5c), (5a '), (5b') and (5c ') offset at 60 ° between them in the same horizontal plane.

Ce trépied peut avoir une trentaine de centimètres de hauteur sur un diamètre de quarante centimètres au niveau des semelles. Il est particulièrement utilisable pour les jambes droites d'échafaudage mais il peut s'utiliser pour les échelles, les tréteaux, etc...This tripod can be about thirty centimeters high on a diameter of forty centimeters at the soles. It is particularly useful for straight legs scaffolding but it can be used for ladders, trestles, etc ...

Claims (10)

Dispositif pour maintenir les jambes d'échafaudage caractérisé en ce qu'il comporte un tube (10) vertical et central, deux couronnes (21) et (22) autour du tube (10) formant joint de cardan grâce à deux axes (1a) et (2b) et trois pieds d'appui (5a), (5b) et (5c) fixés respectivement par trois axes (14a), (14b) et (14c) positionnés à 120° sur la couronne (22) et par l'intermédiaire d'une paire de biellettes croisées (6a) et (6b) entre le tube (10) et chacun des pieds d'appui (5a), (5b) et (5c).Device for holding the scaffold legs characterized in that it comprises a vertical and central tube (10), two rings (21) and (22) around the tube (10) forming a universal joint by means of two axes (1a) and (2b) and three support legs (5a), (5b) and (5c) respectively fixed by three axes (14a), (14b) and (14c) positioned at 120 ° on the ring (22) and by intermediate a pair of crossed rods (6a) and (6b) between the tube (10) and each of the support legs (5a), (5b) and (5c). Dispositif selon la revendication "1" caractérisé en ce que le tube (10) possède trois paires de fixation identiques (9a) et (9b) disposées à 120° autour de sa circonférence externe. Chaque paire de fixation (9a) et (9b) est dans le même plan vertical, l'une au dessus de l'autre et respectivement en face de chaque pied d'appui (5a), (5b) et (5c). Le tube (10) possède deux fentes (1) opposées dans sa partie basse pour le passage d'un axe libre (2b) ainsi que deux trous (3) opposés pour le maintien d'un axe (1a) traversant le tube (10). Les deux trous (3) et les deux fentes (1) forment dans le même plan un angle de 90° sur le tube (10). Le tube (10) possède dans sa partie haute un système de réglages pour ajuster la hauteur des jambes d'échafaudage.Device according to claim 1, characterized in that the tube (10) has three identical fixing pairs (9a) and (9b) arranged at 120 ° around its outer circumference. Each pair of fasteners (9a) and (9b) is in the same vertical plane, one above the other and respectively opposite each support foot (5a), (5b) and (5c). The tube (10) has two slots (1) opposite in its lower part for the passage of a free axis (2b) and two holes (3) opposite for the maintenance of an axis (1a) passing through the tube (10). ). The two holes (3) and the two slots (1) form in the same plane an angle of 90 ° on the tube (10). The tube (10) has in its upper part a system of adjustments to adjust the height of the scaffolding legs. Dispositif selon la revendication "1" ou la revendication "2" caractérisé en ce qu'une couronne interne (21) est solidaire du tube (10) par un axe (1a) de rotation, à travers les trous (3) opposés sur le tube (10) et par un axe (2b) en rotation sur l'axe (1a) à travers les fentes (1) opposées sur le tube (10). Les axes (1a) et (2b) sont dans le même plan et perpendiculaires, ils traversent et maintiennent la couronne inter ne (21).Device according to claim 1 or claim 2, characterized in that an inner ring (21) is secured to the tube (10) by an axis (1a) of rotation, through the holes (3) opposite on the tube (10) and by an axis (2b) rotating on the axis (1a) through the slots (1) opposite the tube (10). The axes (1a) and (2b) are in the same plane and perpendicular, they cross and maintain the inner ring (21). Dispositif selon les revendications précédentes caractérisé en ce que les axes (1a) et (2b) sont en plusieurs parties. Un axe cylindrique unique (1a) fixé à ses extrémités sur la couronne interne(21) au moyen d'écrous (4c), traverse un autre axe (2b) dans la partie centrale (4) de ce dernier. La partie (4) ayant deux excroissances filetées femelles et symétriques pour permettre la fixation des deux boulons axes (4a) et (4b). L'ensemble des deux boulons (4a) et (4b) fixés sur une partie centrale (4) forme l'axe (2b), libre de rotation autour de l'axe (1a).Device according to the preceding claims characterized in that the axes (1a) and (2b) are in several parts. A single cylindrical axis (1a) fixed at its ends to the inner ring (21) by means of nuts (4c), passes through another axis (2b) in the central portion (4) of the latter. The part (4) having two femur and symmetrical threaded protuberances to allow the attachment of the two bolts axes (4a) and (4b). The set of two bolts (4a) and (4b) fixed on a central portion (4) forms the axis (2b), free of rotation about the axis (1a). Dispositif selon les revendications "1" à "4" caractérisé en ce qu'une deuxième couronne externe (22), de plus grand diamètre que la couronne interne (21) se place à l'extérieur de cette dernière, dans le même plan et est maintenue à la couronne (21) et au tube (10) par l'axe (2b) traversant la couronne (21) et les fentes (1) du tube(10) pour se maintenir en rotation sur l'axe (1a). Device according to claims "1" to "4" characterized in that a second outer ring (22), of larger diameter than the inner ring (21) is placed outside the latter, in the same plane and is held at the ring (21) and the tube (10) by the axis (2b) passing through the ring (21) and the slots (1) of the tube (10) to maintain rotation on the axis (1a) . Dispositif selon les revendications précédentes caractérisé en ce que la couronne interne (21), la couronne externe (22) et les axes (1a) et (2b) permettent de créer un mouvement à joint de cardan entre le tube (10) et la couronne externe (22).Device according to the preceding claims characterized in that the inner ring (21), the outer ring (22) and the axes (1a) and (2b) allow to create a universal joint movement between the tube (10) and the crown external (22). Dispositif selon la revendication "5" caractérisé en ce que des fixations (12a), (12b) et (12c) disposées à 120° et dans le même plan sur la couronne externe (22) maintiennent des pieds d'appui (5a), (5b) et (5c) par l'intermédiaire d'axes de rotation (14a), (14b) et (14c) laissant aux pieds d'appui (5a), (5b) et (5c) un débattement libre et vertical par rapport à la couronne externe (22).Device according to claim "5" characterized in that fasteners (12a), (12b) and (12c) arranged at 120 ° and in the same plane on the outer ring (22) maintain support feet (5a), (5b) and (5c) via axes of rotation (14a), (14b) and (14c) leaving at the support feet (5a), (5b) and (5c) a free and vertical movement by relative to the outer ring (22). Dispositif selon les revendications "1" à "7" caractérisé en ce que des paires de biellettes (6a) et (6b) se croisent entre la couronne interne (21) et la couronne externe (22). Elles sont maintenues au tube (10) par les fixations (9a) et (9b) et sur les fixations (8a) et (8b) des demi lunes (8) des pieds d'appui (5a), (5b) et (5c). L'une des biellettes (6a)ou (6b) possède un chas pour permettre leur croisement libre dans le même plan vertical. Les biellettes (6a) et (6b) peuvent être remplacées par un système à câbles.Device according to claims "1" to "7" characterized in that pairs of rods (6a) and (6b) intersect between the inner ring (21) and the outer ring (22). They are held in the tube (10) by the fasteners (9a) and (9b) and on the fasteners (8a) and (8b) of the half-moons (8) of the support feet (5a), (5b) and (5c ). One of the rods (6a) or (6b) has an eye to allow their free crossing in the same vertical plane. The links (6a) and (6b) can be replaced by a cable system. Dispositif selon les revendications "1" à "8" caractérisé en ce que les pieds d'appui (5a), (5b) et (5c) possèdent à leur extrémité inférieure (7a), (7b) et (7c) des semelles montées sur axe, en contact avec le sol. Le corps des pieds d'appui (5a), (5b) et (5c) peuvent être fixés, articulés ou vissés sur leur demi-lune (8) respective.Device according to claims "1" to "8" characterized in that the support feet (5a), (5b) and (5c) have at their lower end (7a), (7b) and (7c) mounted soles on axis, in contact with the ground. The bodies of the support feet (5a), (5b) and (5c) can be fixed, articulated or screwed on their respective half-moon (8). Dispositif suivant toutes les revendications précédentes caractérisé an ce que le dispositif d'invention permet l'articulation solidaire entre le tube (10) et les trois pieds d'appui (5a), (5b) et (5c).Device according to any one of the preceding claims, characterized in that the device of the invention allows the integral articulation between the tube (10) and the three supporting feet (5a), (5b) and (5c).
EP05352006A 2004-04-06 2005-04-04 Tripod stand for legs of scaffolding and feet of ladder with automatic level correction on very irregular ground Withdrawn EP1584773A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0403567A FR2868454B1 (en) 2004-04-06 2004-04-06 TRIPOD FOR SCAFFOLDING LEGS AND SCALE STANDS WITH AUTOMATIC CORRECTION ON VERY IRREGULAR GROUNDS.
FR0403567 2004-04-06

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EP1584773A1 true EP1584773A1 (en) 2005-10-12

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EP05352006A Withdrawn EP1584773A1 (en) 2004-04-06 2005-04-04 Tripod stand for legs of scaffolding and feet of ladder with automatic level correction on very irregular ground

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FR (1) FR2868454B1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN104131693A (en) * 2014-08-04 2014-11-05 刘书雄 Base used for supporting scaffold
US9534443B1 (en) 2011-12-27 2017-01-03 Robert C. Bogart Ladder and related methods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113833241A (en) * 2021-10-08 2021-12-24 中国化学工程第六建设有限公司 Disk buckle type scaffold

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US4723633A (en) * 1987-05-26 1988-02-09 Waco International Corporation Adjusting screw retainer
DE29606287U1 (en) * 1996-04-04 1996-06-20 Herzberger, Gerhard, 80999 München Support and holding device
WO2000026544A1 (en) * 1998-11-04 2000-05-11 Mck Group Ltd Improvements relating to temporary structures
US20020125395A1 (en) * 1999-12-06 2002-09-12 Portable Pipe Hangers, Inc. Support base

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Publication number Priority date Publication date Assignee Title
US4723633A (en) * 1987-05-26 1988-02-09 Waco International Corporation Adjusting screw retainer
DE29606287U1 (en) * 1996-04-04 1996-06-20 Herzberger, Gerhard, 80999 München Support and holding device
WO2000026544A1 (en) * 1998-11-04 2000-05-11 Mck Group Ltd Improvements relating to temporary structures
US20020125395A1 (en) * 1999-12-06 2002-09-12 Portable Pipe Hangers, Inc. Support base

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9534443B1 (en) 2011-12-27 2017-01-03 Robert C. Bogart Ladder and related methods
CN104131693A (en) * 2014-08-04 2014-11-05 刘书雄 Base used for supporting scaffold

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FR2868454B1 (en) 2006-07-14

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