EP3992394B1 - Foldable structure for corbel working for manual adjustment of the extension length of a lateral frame - Google Patents

Description

TECHNICAL AREA

The present invention relates to the building sector and, more particularly, to a foldable cantilevered work structure configured to support a vertical formwork panel.

With reference to the figure 1 , a collapsible cantilevered work structure 103 is configured to be mounted to a building wall of a building such as a building using mounting clips mounted in the building wall. For example, such a foldable cantilevered work structure is known from the patent FR2906286 from SATECO.

The structure 103 comprises a circulation plate 104 extending horizontally and comprising a frame 140 on which rests a floor 141. In this example, the frame 140 has a rectangular shape and includes a plurality of longitudinal crosspieces. The circulation plate 104 extends along its length along an X axis and along its width along a Y axis.

Still with reference to the figure 1 , the circulation plate 104 comprises at least one front edge 104A arranged to extend close to said building wall and at least one rear edge 104B opposite said front edge 104A. In this example, due to its rectangular shape, the circulation tray 104 has a single front edge 104A and a single rear edge 104B. Nevertheless, it goes without saying that the circulation tray 104 could comprise more than one front edge 104A and more than one rear edge 104B.

The circulation plate 104 further comprises elements for fixing to the building wall. Conventionally, the fixing members are in the form of two articulated uprights 151 each at a front end on the circulation plate 104 around a hinge axis substantially parallel to the circulation plate 104, between a folded position of storage and an unfolded position of use substantially orthogonal to the circulation plate 104, at least one foldable arm 152, connecting the circulation plate 104 and the articulated upright 151. During its use, the structure 103 can extend several meters high to form high building walls.

With reference to the figure 1 , in order to prevent the fall of operators circulating on the circulation platform 104, the structure 103 conventionally comprises at least one rear protective canopy 161 and side guardrails 162.

In known manner, the circulation plate 104 comprises lateral extensions so as to increase its length along the X axis in a configurable manner. For this purpose, it is known from the patent application FR2944041A a circulation tray comprising a central frame, a left side frame and a right side frame which are slidably mounted in the central frame in an adjustable manner. In practice, each side frame has a high mass and the adjustment of the extension length is a source of hardship for the operators.

In order to eliminate this drawback, it has been proposed by the patent application FR2944041A an assistance system by separating the side frames from the central frame. The assistance system is in the form of a set of connecting rods which unfold to simultaneously separate the right side frame and the left side frame. Such an assistance system has a high mass as well as a large size due to the presence of numerous connecting rods. In addition, it does not allow independent adjustment of the length of each side frame.

It was also proposed by the patent application FR2984384A an assist system having a lengthwise extending adjustment rod for moving a single side frame. Such an assistance system has a reduced mass but has the disadvantage of limiting the adjustment length which is dependent on the length of the adjustment rod. Thus, in practice, only a reduced extension length can be obtained.

In practice, any assistance system significantly increases the mass of the cantilever work platform. In addition, to activate the assistance system, the operator must use a key or a screwdriver, which has a drawback. EP 2025; 832 A1 discloses a variable length work platform with an assist system.

One of the objectives of the present invention is to provide a foldable cantilevered work structure which eliminates at least some of these drawbacks. This and other objects are achieved by a collapsible structure according to claim 1 and a moving method according to claim 9.

PRESENTATION OF THE INVENTION

The invention relates to a foldable cantilevered work structure intended to be mounted on a vertical construction wall and to support a formwork panel, the structure comprising a circulation plate comprising means of attachment to said vertical construction wall, the plate circulation extending along its length along a first axis and along its width along a second axis, the circulation plate comprising a central frame and at least one side frame mounted to slide relative to the central frame along the first axis, the central frame comprising at least one first guide member configured to slide with at least one second guide member of the side frame.

The structure is remarkable in that it comprises at least one rolling member positioned at the interface between the second guide member and the first guide member so as to allow an operator to move the side frame with reduced friction by relative to the central frame manually and without tools, the foldable cantilevered working structure being free of gear assistance member for moving the side frame.

Thanks to the invention, an operator can move the side frame with reduced friction relative to the central frame. Advantageously, the movement is carried out without tools, in particular without a gear assistance member. The invention takes the opposite view of a prejudice which existed in the prior art and which required the provision of a gear-driven assistance member to carry out the movement of a side frame whose mass may exceed 100 kg. According to the invention, only rolling members are provided to move the side frame relative to the central frame, which makes it possible to reduce the mass as well as the cost of a foldable cantilevered work structure compared to a foldable structure of cantilevered work comprising a geared assistance member.

The manual and tool-free handling is very advantageous since the operator can change the length at any time and without delay. In addition, the adjustment can be carried out precisely by the operator who can manipulate the side frame like a drawer.

Preferably, the foldable cantilevered work structure is free of any pneumatic or hydraulic assistance device. The structure is thus lighter and more economical. Preferably again, the foldable cantilevered working structure is free of assistance members comprising connecting rods.

Preferably, at least one rolling member is configured to guide a bottom surface of the second guide member. A guide of a lower surface makes it possible to significantly eliminate the friction associated with the weight of the side frame under the effect of gravity. The difficulty of the operator is thus reduced. By guiding a lower surface is meant guiding at the level of a lower interface, the rolling member possibly belonging to the first guiding member or to the second guiding member.

Preferably, at least one rolling member is configured to guide an upper surface of the second guide member. Guiding an upper surface makes it possible to guide any inclination of the second guide member due to the overhang in order to limit friction in the lower part and in the upper part. By guiding an upper surface is meant guiding at an upper interface, the rolling member possibly belonging to the first guiding member or to the second guiding member.

Preferably, at least one first rolling member is configured to guide a lower surface of the second guiding member, at least one second rolling member is configured to guide an upper surface of the second guiding member. Preferably, the first rolling member is located at the level of the side frame while the second rolling member is located at the level of the central frame. Thus, the inclination of the second guide member, during its extension, is guided effectively to compensate for the effects of the cantilever.

According to a preferred aspect, at least one rolling member comprises at least one cage with a plurality of bearings, preferably a needle cage. Preferably, each rolling member is in the form of a needle cage. The use of a plurality of bearings is advantageous to optimally reduce friction. Preferably, each bearing is in the form of a needle or a ball. In addition, maintenance of a cage with a plurality of bearings is easy, the cage advantageously protecting the bearings against concrete projections. A needle cage is very advantageous in the context of a cantilevered working structure given that it has a small footprint, which allows its positioning at the interface between a second guide member and a first guide member.

Preferably, at least one rolling member is integral with the first guide member. This advantageously makes it possible to guide the second guide member when the latter slides with the first guide member, the positioning of the rolling member being precise for optimum reduction of friction.

Preferably, at least one rolling member is integral with the second guide member, in particular, in the high position.

Preferably, the first guide member comprising at least one lower wall in which is formed a through opening leading to the second guide member, the rolling member is mounted in the through opening, preferably from the outside of the first guide member. The rolling member is integrated into the first guide member, which limits the size. Advantageously, mounting from the outside of the rolling member facilitates maintenance of the rolling member. This can be conveniently replaced by an operator.

Preferably, the structure comprises at least one second rolling member positioned at the interface between said second guide member and said first guide member.

Preferably, the second guide member comprising at least one upper wall in which is formed a second through opening leading to the first guide member, a second rolling member is mounted in the second through opening. Preferably, the second through-opening is positioned at one end of the second guide member so as to support it during its cantilever extension.

Preferably, the first guide member is in the form of a hollow section in which the second guide member slides.

According to a preferred aspect, the central frame comprising at least two first guide members configured to slide respectively with at least two second guide members of the side frame. Such a distributed guide makes it possible to limit and distribute the forces in each second guide member.

Preferably, at least one rolling member is positioned at the interface between each second guide member and the first guide member with which it slides. The presence of a rolling member at each interface makes it possible to reduce friction in a distributed manner, which is advantageous.

The invention also relates to a method for moving a side frame of a structure as presented above, the adjustment method comprising a step of manual movement without tools by an operator of the side frame, the rolling member allowing movement of the second guide member of the side frame with reduced friction relative to the first guide member of the central frame.

PRESENTATION OF FIGURES

• [Fig. 1] est une représentation schématique en perspective d'une structure pliable de travail en encorbellement selon l'art antérieur ;
• [Fig. 2] est une représentation schématique en perspective d'une structure pliable de travail en encorbellement selon l'invention ;
• [Fig. 3] est une représentation schématique en perspective de la structure de la figure 2 sans le plancher central ;
• [Fig. 4] est une représentation schématique rapprochée de dessous du châssis latéral droit ;
• [Fig. 5] est une représentation schématique rapprochée d'un organe de roulement ;
• [Fig. 6] est une représentation schématique rapprochée des roulements de l'organe de roulement ;
• [Fig. 7] est une vue en coupe avec un organe de roulement en position basse ;
• [Fig. 8A] est une vue en coupe avec un organe de roulement en position basse et un organe de roulement en position haute ;
• [Fig. 8B] est une vue en perspective des organes de roulement, le premier organe de guidage n'étant pas représenté ;
• [Fig. 9]
• [Fig. 10] et
• [Fig. 11] sont des représentations schématiques d'un châssis central et d'un châssis latéral selon plusieurs configurations.

The invention will be better understood on reading the following description, given solely by way of example, and referring to the accompanying drawings given by way of non-limiting examples, in which identical references are given to similar objects. and on which:

• [ Fig. 1 ] is a schematic representation in perspective of a foldable cantilevered work structure according to the prior art;
• [ Fig. 2 ] is a schematic representation in perspective of a foldable cantilevered work structure according to the invention;
• [ Fig. 3 ] is a perspective schematic representation of the structure of the picture 2 without the central floor;
• [ Fig. 4 ] is a close-up schematic representation of the right side frame from below;
• [ Fig. 5 ] is a close-up schematic representation of a running gear;
• [ Fig. 6 ] is a close-up schematic representation of the bearings of the running gear;
• [ Fig. 7 ] is a sectional view with a running gear in the low position;
• [ Fig. 8A ] is a sectional view with a rolling member in the low position and a rolling member in the high position;
• [ Fig. 8B ] is a perspective view of the running gear, the first guide member not being shown;
• [ Fig. 9 ]
• [ Fig. 10 ] And
• [ Fig. 11 ] are schematic representations of a central frame and a side frame in several configurations.

It should be noted that the figures expose the invention in detail to implement the invention, said figures can of course be used to better define the invention if necessary.

DETAILED DESCRIPTION OF THE INVENTION

With reference to the figure 2 , there is shown a foldable cantilevered working structure 3, according to one embodiment of the invention, configured to support a vertical formwork panel (not shown).

As presented previously, the foldable cantilevered work structure 3 is configured to be mounted on a vertical construction wall of a building such as a building using fastening clips mounted in the vertical construction wall. Structure 3 comprises a circulation plate 4 comprising at least one front edge 4A arranged to extend close to said wall and at least one rear edge 4B opposite said front edge 4A. In this example, due to its rectangular shape, the circulation tray 4 has a single front edge 4A and a single rear edge 4B. Nevertheless, it goes without saying that the circulation plate 4 could comprise more than one front edge 4A and more than one rear edge 4B. As shown in figure 2 , the circulation plate 4 extends along its length along a first axis X, along its width along a second axis Y and vertically along a third axis Z so as to form an orthogonal reference (X, Y, Z).

The circulation plate 4 further comprises members for fixing to the vertical building wall. Conventionally, the fixing members are in the form of two articulated uprights 51 each at a front end on the circulation plate 4 around an axis of articulation substantially parallel to the circulation plate 4, between a folded position of storage and an unfolded position of use substantially orthogonal to the circulation plate 4, at least one foldable arm 52, connecting the circulation plate 4 and the articulated upright 51. During its use, the structure 3 can extend to several meters in height to form vertical walls of high construction. In order to prevent operators circulating on the circulation platform 4 from falling, the structure 3 conventionally comprises at least one rear protective canopy 61 and side guardrails 62.

As shown in picture 3 , the circulation plate 4 comprises a central frame 40C and two side frames 40G, 40D (a left side frame 40G and a right side frame 40D) mounted to slide relative to the central frame 40C along the first axis X.

The central frame 40C comprises several first guide members 43, extending along the first axis X, and several horizontal crosspieces 42, extending along the second axis Y so as to form a support structure for receiving a central floor 41 ( see figure 2 ). In this example, the central frame 40C comprises two horizontal crosspieces 42 as well as three first guide members 43 but it goes without saying that their numbers could be different.

In this example, side frames 40G, 40R are symmetrical. Also, for the sake of clarity and conciseness, only the 40D right side frame will be presented below. The right side frame 40D comprises several second guide members 44, extending along the first axis X, and a single horizontal crosspiece 45, extending along the second Y axis so as to form a support structure to receive a side floor (not shown). It goes without saying that the numbers of second guide members 44 and of horizontal crosspieces 45 could be different. In this example, the horizontal crosspiece 45 forms one end of the right side frame 40D.

In this embodiment, the second guide members 44 are connected to the horizontal crosspiece 45 in a movable manner in order to allow the horizontal crosspiece 45 to tilt with respect to the second axis Y, in particular, when the extension lengths second guide members 44 are different ( figure 11 ). In this example, the second guide members 44 are connected in an articulated manner to the horizontal crosspiece 45. Such an implementation will be presented subsequently.

As shown in figure 4 , each first guide member 43 of the central frame 40C is configured to slide with at least one second guide member 44 of the right side frame 40D along the first axis X. In this example, the first guide members 43 and the second guide 44 are in the form of hollow sections, in particular, of rectangular section. The second guide members 44 are configured to slide inside the first guide members 43 but it goes without saying that the reverse would be possible. Each hollow profile defines a lower wall and an upper wall which are preferably planar to facilitate sliding.

As shown in figure 5 , each second guide member 44 is in the form of a profile of rectangular section and comprises through-cavities formed in the lower wall of the rectangular section. It goes without saying that the bottom wall could be solid, in particular, to improve rolling, as will be presented below.

Advantageously, each second guide member 44 can move within the first guide member 43 independently of the other second guide members 44. Thus, the extension length of each second guide member 44 can be adjusted independent as shown in figure 11 .

In order to limit the arduousness, the central frame 40C comprises rolling members 9 configured to allow effortless sliding of the second guide members 44 in relation to the first guide members 43.

In this first example of implementation, with reference to the figures 4 to 7 , a rolling member 9 is mounted in each first guide member 43. The rolling member 9 is mounted at the mouth of the first guide member 43 which is hollow in order to Internally guide the second guide member 44. Such a positioning makes it possible to compensate for inclination defects during deployment/folding while limiting friction.

Preferably, with reference to the figure 7 , the rolling member 9 is configured to guide a lower surface 44a of the second guide member 44. Such positioning is advantageous given that it makes it possible to eliminate all the friction induced by gravity on the second guide member 44 .

In this example, the rolling member 9 is fixed to the lower wall 430 of the first guide member 43. Preferably, the lower wall 430 of the first guide member 43 comprises a through opening 431 in which the guide member is mounted. bearing 9. This makes it possible to mount the rolling member 9 from the outside in order to be able to open into the internal cavity of the first guide member 43 and thus come into contact with the lower surface 44a of the second guide member 44. rolling member 9 is thus integrated into the guide but remains easily accessible, in particular for its maintenance.

The rolling member 9 comprises a plurality of bearings 91 mounted in a cage 90. Preferably, the rolling member 9 is in the form of a needle cage which makes it possible to ensure optimum limitation of friction while while remaining compact, which is advantageous in order to be positioned between a first guide member 43 and a second guide member 44. Preferably, all the rolling members 9 are identical and, more preferably, needle cages. Preferably, the cage 91 makes it possible to precisely position the rolling member 9 while increasing the mechanical resistance. It goes without saying that the bearings 91 could be in the form of balls.

In this first example of implementation, a rolling member is provided for each second guide member 44 but it goes without saying that only part of the second guide members 44 could be equipped with a rolling member 9.

In addition, a rolling member 9 has been presented in the low position to guide the lower surface 44a of the second guide member 44, but it goes without saying that other positions could be suitable, in particular a high position or a lateral position. .

Preferably, several running gears are provided for each second guide member 44 so as to produce several types of complementary guidance. With reference to figure 8A And 8B , there are shown two running gears 9, 9' positioned respectively in the low position and in the high position to allow optimal vertical guidance during the deployment/folding of the second guide member 44. An upper and lower guide makes it possible to limit any vertical movement and reduce any friction.

In this example, the second guide member 44 comprises an upper wall 440 in which is formed a second through opening 441 opening onto the first guide member 43. The second rolling member 9' is mounted in the second through opening 441. The second rolling member 9' is accessible by the operator by removing the second guide member 44 from the first guide member 43. Mounting the second rolling member 9' in the first guide member 43 could be possible but requires removing the circulation plate 4 in the event of maintenance, which is more complex.

Preferably, the second through opening 441 is positioned at one end of the second guide member 44, preferably an inner end positioned under the circulation plate 4 of the central frame 40C, so as to support it during its extension.

The two running gear 9, 9' are mounted at a distance, preferably in the low outer position and in the high inner position as illustrated in figure 8A And 8B so as to support the weight of the right side frame 40D during its extension. It goes without saying that the assembly could be different.

According to a preferred aspect, the structure 3 includes a locking device configured to block a movement of the second guide member 44 relative to the first guide member 43 after adjustment. Preferably, the locking device is in the form of a locking pin.

A method for adjusting the extension length of the right side frame 40D of the structure 3 will now be presented. The adjustment operation is carried out on the ground.

In this example, as shown in figure 9 , the right side frame 40D is initially not deployed and the horizontal crosspiece 45 is adjacent to the central frame 40C. To adjust the extension length of the right side frame 40D, an operator manually grasps the horizontal crosspiece 45 and moves it to the right to unfold the second guide members 44.

The second guide members 44 are driven effortlessly thanks to the rolling members 9 which are integrated into the first guide members 43 which come eliminate all friction. Due to the performance of the rolling members 9, 9', any traditional assistance member is not necessary.

The second guide members 44 are driven simultaneously and the extension length is adjusted uniformly as shown in figure 10 . A floor is then placed on the side frame 40C.

According to another example of implementation, with reference to the figure 11 , it is sometimes desirable that the horizontal crosspiece 45 of the right side frame 40D be inclined with respect to the second axis Y, in particular by an angle ANG of 45° to 135°, in order to adapt to the constraints of the building wall vertical on which the structure 3 must be fixed. The operator manually moves the second guide members 44 in order to adjust their extension length independently. As the second guide members 44 are hinged to the horizontal crosspiece 45, this advantageously makes it possible to tilt the horizontal crosspiece 45 according to the desired angle of inclination ANG. Manual movement remains easy due to the presence of running gear 9, 9'.

Once the extension length adjustment is complete, the locking device is put in place to eliminate any slippage. The structure 3 can then be lifted using a crane and positioned on a vertical construction wall to receive formwork panels whose length is adapted to the length of the structure 3.

Advantageously, due to the presence of rolling members 9, 9', the adjustment of the extension length LE of a side frame 40D, 40G can be adjusted effortlessly by an operator, without tools, by simple manipulation. . Advantageously, the foldable cantilevered work structure 3 is free of gear assistance member such as in the prior art which made the foldable cantilevered work structure 3 heavier and more complex.

Claims (9)

1. A foldable corbelled work structure (3) intended to be mounted to a vertical construction wall and to support a formwork panel, the structure (3) comprising a circulation plate (4) including means (51) for attachment to said vertical construction wall, the circulation plate (4) extending along its length along a first axis (X) and along its width along a second axis (Y), the circulation platform (4) including a central chassis (40C) and at least one side chassis (40G, 40D) slidably mounted relative to the central chassis (40C) along the first axis (X), the central chassis (40C) including at least one first guide member (43) configured to slide with at least one second guide member (44) of the side chassis (40G, 40D), the structure being characterised in that it includes at least one bearing member (9, 9') positioned at the interface between the second guide member (44) and the first guide member (43) so as to allow an operator to move the side chassis (40G, 40D) with reduced friction relative to the central chassis (40C) manually and without tools, the foldable corbelled work structure (3) being free of any geared assistance member for moving the side chassis (40G, 40D), the first guide member (43) being in the form of a hollow profile in which the second guide member (44) slides, the first guide member (43) including at least one lower wall (430) in which is formed a through-opening (431) opening onto the second guide member (44), the bearing member (9) comprising at least one cage (90) with a plurality of bearings (91), the bearing member (9) being mounted in the through-opening (431) to guide a lower surface (44a) of the second guide member (44).
2. The structure according to claim 1, wherein at least one bearing member (9') is configured to guide an upper surface of the second guide member (44).
3. The structure according to one of claims 1 to 2, wherein at least one first bearing member (9) is configured to guide a lower surface (44a) of the second guide member (44) and at least one second bearing member (9') is configured to guide an upper surface of said second guide member (44).
4. The structure according to one of claims 1 to 3, wherein the bearing member (9, 9') is a needle roller cage.
5. The structure according to one of claims 1 to 4, wherein at least one bearing member (9) is integral with the first guide member (43).
6. The structure according to one of claims 1 to 5, wherein the bearing member (9) is mounted in the through opening (431) from outside of the first guide member (43).
7. The structure according to one of claims 1 to 6, wherein, the central chassis (40C) including at least two first guide members (43) configured to slide respectively with at least two second guide members (44) of the side chassis (40G, 40D).
8. The structure according to one of claims 1 to 7, wherein, at least one bearing member (9, 9') is positioned at the interface between each second guide member (44) and the first guide member (43) with which it slides.
9. A method for moving a side chassis (40G, 40D) of a structure (3) according to one of claims 1 to 8, the movement method comprises a step of manually moving, without tools by an operator, the side chassis (40G, 40D), the bearing member (9) allowing movement of the second guide member (44) of the side chassis (40G, 40D) with reduced friction relative to the first guide member (43) of the central chassis (40C).

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