EP0468907A1 - Pliable supporting-console for wall-forms - Google Patents

Abstract

Platform support (1) comprising locking means which are, in combination, constituted by: - first hooks (9), each pivoting at one of the ends of a rotation spindle (90) solidly connected to the profiles (22a, 22b) forming the cross members (22) of the frame (2), and suitable for locking the articulated console bracket (4) in the folded position; - second hooks (8) mounted so as to freely rotate about the spindle (9) of the first hooks (9) and capable of locking the articulated console bracket (4) when it is in the unfolded position; - and a longitudinal tube (10) solidly connected at its ends to two plates (10a) mounted so as to be free to rotate on the spindles (90) common to the hooks (9 and 8), the said plates (10a) being arranged on the opposite side of the said first hooks (9) for the locking of the platform support (1) in the unfolded position on support shoes (7) fixed against a wall (6). <IMAGE>

Description

The present invention relates to improvements made to the foldable gangways-supports for formwork formwork and it relates more particularly to the locking means allowing the gangway to be either folded for its handling or its storage, or unfolded in the position of use. , that is to say suspended from hooves secured to a wall.

Gangways of this kind are known which generally comprise a chassis serving as a platform and under which a hinged chair pivots. The latter consists of at least two deformable triangles connected together by a longitudinal element allowing synchronization of movements.

Each deformable triangle has a bar which slides in a transverse beam of the chassis equipped with locking means, for example bolts or pinned pins. These locking means cooperate with co-axial bores made in the sliding bar and in the beam, so that the chair is immobilized in a folded or unfolded position.

In the position of use, that is to say when the gangway is suspended on hooves, it is planned to add railings on the periphery of the chassis. The railings include at their base inclined rods of square or circular section, which slide in slides of the same section secured to the chassis.

Such a gangway has certain drawbacks with regard to the means for locking the articulated chair and the railing on the chassis.

We note more particularly that the locking of the articulated chair in the unfolded position requires the intervention of several operators who must demonstrate great skill, if only because the unfolded position is obtained when the gangway is suspended from a crane, which implies lateral rocking obviously does not facilitate locking.

It is to these drawbacks that the present invention more specifically intends to remedy.

The invention aims to provide automatic locking means no longer involving bolts or pinned pins, while remaining simple and easy to use.

The invention also aims to use the fact that the gangway is suspended from a crane during its handling to trigger, without the intervention of operators, either the opening and locking of the articulated chair in the position of use, or its folding and locking in the storage position.

• des premiers crochets, chacun pivotant à l'une des extrémités d'un axe de rotation solidaire des profilés formant les traverses du châssis de manière à verrouiller la chaise articulée en position pliée ;
• des seconds crochets indépendants en rotation autour de l'axe commun aux premiers crochets, de façon à verrouiller la chaise articulée lorsqu'elle se trouve en position dépliée ;
• et d'un tube longitudinal solidaire en chacune de ses extrémités d'une plaque montée libre en rotation sur l'axe commun aux premiers et seconds crochets de manière à être disposé à l'opposé desdits premiers crochets pour le verrouillage de la passerelle en position dépliée sur des sabots fixés contre un mur.

To this end, the invention is characterized in that the locking means comprise in combination:

• first hooks, each pivoting at one end of an axis of rotation integral with the profiles forming the cross members of the frame so as to lock the articulated chair in the folded position;
• second independent hooks rotating around the axis common to the first hooks, so as to lock the articulated chair when it is in the unfolded position;
• and of a longitudinal tube integral at each of its ends with a plate mounted free in rotation on the axis common to the first and second hooks so as to be disposed opposite said first hooks for locking the gangway in position unfolded on hooves fixed against a wall.

The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:

Fig. 1 is a perspective view of the bridge according to the invention.

Fig. 2 is a side view showing the gangway in the unfolded position and suspended against a wall for its use.

Fig. 3 is a side view illustrating the gangway in the folded position of storage.

Fig. 4 is a perspective view of the locking hook of the articulated chair in the folded position.

Fig. 5 is a perspective view of the locking hook of the chair in the unfolded position.

Fig. 6 is a perspective view of the gangway locking tube when it is hung against a wall.

Fig. 7 and 8 are perspective views of the immobilization hook of the bridge railing.

There is shown in fig. 1 and 2 a walkway 1 in the unfolded position, comprising a metal platform 2 with a generally rectangular profile, on which are articulated a railing 3 and two chairs 4.

The railing 3 comprises a metal frame 30 in the middle of which a protective mesh 31 is welded. The frame 30 is stiffened along its length by a plinth 32.

The articulated chairs 4 are made up of identical deformable triangles 40, the number of which (two in this case) can vary depending on the length of the frame 2. The deformable triangles 40 are connected together by a tube 41 with a square or rectangular section.

The chassis 2 consists of two longitudinal beams 20 and 21 which are interconnected by crosspieces 22 so as to form the frame of the chassis. The latter is reinforced in its length by longitudinal members 23 integral with the crossbeams 22 and on which rest wooden planks 24 providing the platform known per se for the passage of workers.

For the sake of clarity and to facilitate understanding and since the platform 2 is axially symmetrical, we will only describe below the elements on one side of this platform.

The longitudinal beam 20 has along its length two angles facing 25 and 26 (fig. 2) integral with one another to form a slide 25 a in which slides a support 25 b for fixing a forestay 25 c . the bracket 25 is associated with a gusset 25 d and with an immobilization hook 5 allowing the pivoting and locking of the railing 3, the operation of which will be better explained below.

The longitudinal beam 21 is connected to the longitudinal members 23 by several cross members 21 a with a square or rectangular section making it possible to stiffen the frame of the chassis 2. In addition, the longitudinal beam 21 has over its length a certain number of vertical guides 21 b with a square section for sliding graduated supports 21 c known per se. These supports allow the height adjustment and the maintenance in place of vertical forms 21 d which are retained by means of the struts 25 c . In addition, the beam 21 allows the gangway 1 to be hooked against a wall 6 by means of shoes 7, known per se, which are fixed by tie rods 7 to said wall (fig. 2).

The crossbeams 22 are constituted by two sections 22 a and 22 b with a C-shaped section facing each other, so as to produce a transverse slide 22 c (fig. 4) whose function will be better explained below.

The lower part of the two ends of the longitudinal beam 20 carries an ear 20 a provided with an axis of rotation 20 b (fig. 2 and 3) around which is articulated one of the ends of a double stay 40 a belonging to each articulated chair 4. This double guy 40 a has at its other end a rotation axis 40 b for the pivoting of a hollow bar 40 c with a square section, serving as a strut. This end is integral with a longitudinal tube 41 which allows the chairs 4, once unfolded, to bear against the wall 6.

The upper end of each hollow bar 40 c is secured to two circular ears 40 e (fig. 5) which slide in the slide 22 c so as to guide the corresponding articulated chair 4 in its movements. When the latter is unfolded, it can be noted that the hollow bar 40 c is blocked in translation by a pivoting hook 8, the operation of which will be explained with reference to FIG. 5.

There is shown in fig. 3 the gangway 1 in the folded position allowing thus its stacking with other gangways for its storage or transport.

It is noted that each guy 40 a folds back along arrow F1 so that the hollow bar 40 c slides by means of its ears 40 e in the slide 22 c until a retaining finger 40 d , secured to the double guy 40 a , or retained by a swivel hook 9.

The railing 3, once unlocked, can be folded down according to the arrow F2 on the boards 24 of the platform so as to reduce the size e of the gangway 1.

In fig. 4, there is illustrated the hook 9 allowing the locking of each articulated chair 4 in the folded position. This hook 9 comprises a notch 9 a for the retention of the finger 40 d , as well as an inclined edge 9 b on which the finger 40 d rests in order to snap into the hook. The external face 9 c of the hook 9 is integral with a handle 9 d allowing the opening along the arrow F3 of said hook in order to release the retaining finger 40 d from the double shroud 40 a .

The hook 9 is mounted to rotate freely at one end of an axis 90 provided on the upper face of the sections 22 a and 22 b of the chassis 2. In addition, the hook 9 is retained laterally between the section 22 a and a washer 90 has welded to the end of the axis 90, while its rotation is limited by an end-of-stroke stop 91 secured to the external vertical face of the profile 22 a .

In fig. 5, the hook 8 is shown allowing the locking of each articulated chair 4 in the unfolded position and more particularly for the retention of the bar 40 c of the deformable triangle 40.

The hook 8 is constituted by a rectangular plate 8 a provided at one of its ends with a pad 8 b mounted freely in rotation about the axis 90 of the hook 9, so that it is guided laterally in the slide 22 c, that is to say between the edges facing the profiles 22 a and 22 b . Under the plate 8 a are welded two end stops 8 c and 8 d , the widths of which are such that they can penetrate into the upper free space defined above.

On one of the edges of the plate 8 a is welded a handle 8 e allowing the manual tilting of the hook 8 in order to release the bar 40 c from the deformable triangle 40 with a view to its folding.

There is shown in fig. 6 a longitudinal tube 10 of circular section allowing the locking of the bridge 1 on the shoes 7 known per se.

The two ends of the longitudinal tube 10 are secured to a rectangular plate 10 a mounted to rotate freely on the axis 90 common to the hooks 8 and 9 of the chairs 4. The plate is in particular arranged opposite the hook 9 and to proximity to profile 22 b .

In addition, the longitudinal tube comprises control means 10 b , for example hooks which can be associated with chains or cables making it possible to drive said tube in a quarter-turn rotation according to arrow F4 for the bring against the crosspieces 21 a (fig. 6). When the walkway 1 is mounted in the shoes 7, it is locked by means of the tube 10 which passes under a horizontal retaining stop 7 b secured to said shoes 7.

We have shown in fig. 7 and 8 the retaining hook 5 allowing the guardrail 3 to be locked in the open position. The frame 30 comprises a vertical post 33 whose end is shaped inclined heel 33 has a bore 33 b through which an axis of rotation 25 e fixed to the gusset 25 d. The vertical face 25 f of the profile 25 comprises a sleeve 25 g crossed by an axis of rotation 5 a secured to the retaining hook 5.

A counter stop 5 b is welded to the axis of rotation 5 a in opposition to a retaining stop 5 c secured to the hook 5. The end opposite to the retaining stop 5 c is secured to a longitudinal tube 5 d with square section. The tube 5 d is connected to another locking device identical to that which has just been described, so as to synchronize the pivoting of the hooks 5 for the release of the railing 3. In addition, the weight of the longitudinal tube 5 d automatically brings the hook 5 to the locking position.

• il ouvre le garde-corps 3 qui pivote autour de ses axes de rotation 25e jusqu'à ce que chaque talon incliné 33a soit bloqué par son crochet 5 (fig. 2, 7 et 8) ;
• il fixe le crochet d'une grue au moyen de commandes 10b solidaires du tube longitudinal 10 en traversant certaines planches 24 de la plateforme (fig. 6) ;
• il ouvre manuellement le crochet pivotant 9, afin de libérer le doigt de retenue 40d du double hauban 40a (fig. 4) ;
• à l'aide de la grue, il soulève la passerelle 1, ce qui provoque le pivotement d'un quart de tour du tube 10 jusqu'à ce qu'il vienne buter contre les traverses 21a de manière à équilibrer les charges de traction ; ce soulévement implique le coulissement de la barre creuse 40c dans la glissière 22c jusqu'à ce qu'elle soit bloquée automatiquement en translation par le crochet 8 (fig. 2 et 5) ;
• il amène la passerelle 1 à son emplacement d'utilisation, de sorte que la poutre longitudinale 21 s'engage dans les sabots 7 pré-installés contre le mur 6 ;
• il détache les moyens de commande 10b de manière à libérer le tube longitudinal 10, qui du fait de son propre poids pivote pour venir contre les sabots 7 afin d'être retenu par la butée horizontale 7b, réalisant ainsi le verrouillage de la passerelle 1 sur le mur 6 ;
• il règle en hauteur les supports millimétriques 21c pour la mise en place des banches 21d ;
• et il positionne les supports 25b dans la glissière 25a de manière à fixer les étais 25c pour maintenir les banches 21d.

The operation of the locking means of the gateway 1 is easily understood. The operator must proceed as follows from from the folded position on the ground of the walkway 1 (fig. 3):

• it opens the railing 3 which pivots around its axes of rotation 25 e until each inclined heel 33 a is blocked by its hook 5 (fig. 2, 7 and 8);
• it fixes the hook of a crane by means of controls 10 b secured to the longitudinal tube 10 by crossing certain boards 24 of the platform (fig. 6);
• it manually opens the pivoting hook 9, in order to release the retaining finger 40 d from the double shroud 40 a (fig. 4);
• using the crane, it raises the gateway 1, which causes pivoting of a quarter turn of the tube 10 until it abuts against the webs 21 a so as to balance the tensile loads ; this lifting implies the sliding of the hollow bar 40 c in the slide 22 c until it is blocked automatically in translation by the hook 8 (fig. 2 and 5);
• it brings the bridge 1 to its place of use, so that the longitudinal beam 21 engages in the shoes 7 pre-installed against the wall 6;
• it detaches the control means 10 b so as to release the longitudinal tube 10, which due to its own weight pivots to come against the shoes 7 so as to be retained by the horizontal stop 7 b , thus achieving the locking of the gangway 1 on wall 6;
• it adjusts the height of the millimeter supports 21 c for the installation of the formwork 21 d ;
• and it positions the supports 25 b in the slide 25 a so as to fix the stays 25 c to hold the forms 21 d .

• il retire les banches 21d et les étais 25c de la passerelle 1 ;
• il attache le crochet d'une grue au moyen de commandes 10b solidaires du tube longitudinal 10 ;
• il soulève la passerelle 1, ce qui provoque le pivotement d'un quart de tour du tube longitudinal 10, de manière à libérer la poutre 21 des sabots 7, ledit tube venant en butée contre les traverses 21a du châssis 2 ;
• il amène la passerelle 1 au contact du sol, de manière que le tube longitudinal 41 y repose ;
• il manoeuvre les crochets 8 manuellement afin de libérer la barre creuse 40c des butées 8c et 8d ;
• il descend la passerelle 1 de façon à provoquer le coulissement des barres creuses 40c dans leur glissière 22c, jusqu'à ce que le doigt de retenue 40d de chacune d'elle soit en contact avec la partie inclinée 9b du crochet 9 correspondant, afin de le faire pivoter autour de l'axe 90 jusqu'à ce que le doigt de retenue soit logé dans l'encoche 9a pour son verrouillage ;
• il détache le crochet de la grue des moyens de commande 10b provoquant le retour du tube longitudinal 10 en position de repos ;
• et il appuie sur le crochet 5 afin de libérer le talon 33a du cadre 30 pour rabattre le garde-corps 3 sur la plate-forme de la passerelle 1 (flèche F2 de fig. 3).

For the folding of the bridge 1, the operator proceeds as follows:

• it removes the formwork 21 d and the struts 25 c from the bridge 1;
• it attaches the hook of a crane by means of controls 10 b integral with the longitudinal tube 10;
• it raises the gateway 1, which causes pivoting of a quarter turn of the longitudinal tube 10, so as to release the beam 21 clogs 7, said tube abutting against the crosspieces 21a of the chassis 2;
• it brings the bridge 1 into contact with the ground, so that the longitudinal tube 41 rests there;
• he maneuvers the hooks 8 manually in order to release the hollow bar 40 c from the stops 8 c and 8 d ;
• it descends the bridge 1 so as to cause the hollow bars 40 c to slide in their slide 22 c , until the retaining finger 40 d of each of them is in contact with the inclined part 9 b of the hook 9 corresponding, in order to rotate it around the axis 90 until the retaining finger is housed in the notch 9 a for its locking;
• it detaches the hook of the crane from the control means 10 b causing the longitudinal tube 10 to return to the rest position;
• and it presses on the hook 5 in order to release the heel 33 a from the frame 30 to fold the railing 3 onto the platform of the gangway 1 (arrow F2 in fig. 3).

It goes without saying that such a gangway 1 can be associated with accessories known in the technical field used, that is to say for example gangway or railing extensions and 45 ° angle extensions. .

Claims (12)

Foldable gangway for formwork form, of the type comprising a metal frame provided with locking means for retaining an articulated chair, characterized in that the locking means comprise in combination: - First hooks (9), each pivoting at one end of a rotation axis (90) integral with the profiles (22 a , 22 b ) forming the crosspieces (22) of the frame (2), and suitable for lock the articulated chair (4) in the folded position; - second hooks (8) mounted for free rotation around the axis (90) of the first hooks (9) and capable of locking the articulated chair (4) when it is in the unfolded position; - And a longitudinal tube (10) integral at its ends with two plates (10 a ) mounted free in rotation on the axes (90) common to the hooks (9 and 8), said plates (10 a ) being arranged opposite said first hooks (9) for locking the gangway (1) in the unfolded position on shoes (7) fixed against a wall (6). Gangway according to claim 1, characterized in that the chassis (2) comprises a railing (3) which is articulated around axes of rotation (25 e ) and which is immobilized in a position by means of pivoting hooks (5). Gangway according to claim 1, characterized in that the first hooks (9) each have a notch (9a) and an inclined edge (9b) for retaining the fingers (40 d ) of the articulated chair (4). Gangway according to claim 1, characterized in that the external face (9c) of the first hooks (9) comprises a handle (9d) for the operation of said hooks (9). Gangway according to claim 1, characterized in that the second hooks (8) each consist of a rectangular plate (8 a ) integral with two end of travel stops (8 c and 8 d ). Gangway according to claim 5, characterized in that the limit stop stops (8 c and 8 d ) of the second hooks (8) are of a width calculated to be able to penetrate into the upper free space of the slide (22 c ) provided between the profiles (22 a and 22 b ). Gangway according to any one of claims 1, 4, 5 and 6 characterized in that the plate (8 a ) of the second hooks (8) is welded to a handle (8 e ) allowing the opening of said hooks. Gangway according to any one of claims 1, 5, 6 and 7, characterized in that the second hooks (8) are guided laterally in the upper space of the slide (22 c ). Gangway according to claim 1, characterized in that the longitudinal tube (10) is integral with control means (10 b ). Gangway according to any one of claims 1 and 9, characterized in that the longitudinal tube (10) comes against the crosspieces (21 a ) of the frame (2) to balance the tensile loads when the said gangway is raised. Gangway according to claim 2, characterized in that the hooks (5) are returned to the locked position via the longitudinal tube (5 d ). Gangway according to claims 2 and 11, characterized in that the axes of rotation (5 a ) of the hooks (5) comprise a buttress (5 b ) opposing the retaining stop (5 c ) integral with said hooks (5).

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