EP3744941B1 - Acoustic box for a roller shutter - Google Patents

Description

Technical field of the invention

The present invention relates to the general field of rolling shutters contained in a trunk. More specifically, it relates to a roller shutter box assembly, the box of which has increased sound insulation.

State of the art

Roller shutters comprise, in a conventional manner, a prefabricated box containing a winding shaft, not shown, resting by its ends on bearings integral with the end flanges of said box and to which is hung an apron, not shown, formed of blades horizontal hinged together and whose ends move vertically inside guide rails, not shown, secured to a window of a building associated with the roller shutter or the masonry of the building surrounding said window. Thus, to raise the roller shutter, the apron is wrapped around the shaft and, on the contrary, to lower the roller shutter, the apron is unrolled.

This type of roller shutter is very efficient from a mechanical and kinematic point of view, but has the disadvantage of being relatively noisy, particularly at the level of the trunk, the major part of which is arranged inside the building. Indeed, during renovation work on the windows of a building, the box of each roller shutter, which is usually pre-assembled in the factory and made by assembling polyvinyl chloride (PVC) boards or panels, advantageously double-walled, cannot not be integrated into the masonry and is therefore protruding inside the building against the masonry. GB2166479A and EP 0 997 604 A1 each disclose an acoustic roller shutter box according to the preamble of claim 1. DE 202 11 717 U1 discloses a box attached to the masonry of the window opening, U-shaped open on the lower side, formed by two L-shaped structures which overlap and are glued together on the top. The side walls of said box are essentially hollow plastic panels with mitered ends. AT 4 092 U1 discloses an essentially U-shaped box profile, in particular for roller shutter boxes, intended to reduce the transport volume and therefore the transport costs and to guarantee perfect adhesion of the plaster to the outer face of the profile box without additional measures. This box profile consists of several plastic box profile elements having at least one chamber.

Summary of the invention

The object of the present invention is to reinforce the overall acoustic performance of a roller shutter box by proposing a variant of a board of a box that is easy to implement in said box and makes it possible to increase the acoustic insulation of the latter. , while guaranteeing good mechanical strength of this box, which is mounted cantilevered on the upper frame of a window.

In accordance with the invention, there is therefore proposed an acoustic box for a rolling shutter comprising at least rear, upper, front and lower boards each comprising at least one internal wall, an external wall and a plurality of cells extending longitudinally between said internal and external walls, said box being remarkable in that the majority of the cells of at least the upper and lower boards have a cross-section in the shape of a circle, or of a hexagon and/or of a pentagon having at least one side inclined with respect to the associated internal and/or external wall(s) or of a closed hybrid line composed of a combination of circle and d a hexagon or pentagon.

According to a preferred embodiment, the cells have sections of different sizes and shapes.

The back, top, front and bottom boards are advantageously made of polyvinyl chloride.

Brief description of figures

• [Fig 1] est une vue en coupe verticale d'un coffre de volet roulant selon l'art antérieur,
• [Fig 2] est une vue en coupe verticale d'une première variante d'un coffre de volet roulant conforme à l'invention,
• [Fig 3] est une vue en coupe verticale partielle d'une deuxième variante d'un coffre de volet roulant conforme à l'invention,
• [Fig 4] est un schéma explicatif du principe d'isolation acoustique du coffre de la figure 2.

Other advantages and characteristics will emerge better from the following description of an embodiment of the invention with reference to the appended figures in which:

• [ Fig 1 ] is a vertical sectional view of a roller shutter box according to the prior art,
• [ Fig 2 ] is a vertical sectional view of a first variant of a roller shutter box according to the invention,
• [ Fig.3 ] is a partial vertical sectional view of a second variant of a roller shutter box according to the invention,
• [ Fig 4 ] is an explanatory diagram of the principle of acoustic insulation of the trunk of the figure 2 .

Description of embodiments

On the figure 1 , there is shown a box 1 for roller shutter according to the prior art made from an assembly of longitudinal boards 2,3,4,5 and two end plates, not shown, said end plates and boards 2,3,4,5 being conventionally double walls made of polyvinyl chloride (PVC).

On the figures 2 to 4 , there is shown a box 10 for roller shutter according to the invention similar to the box 1 of the prior art described above and also made from an assembly of two end plates, not shown, and longitudinal boards, namely a rear board 11 located on the side of the masonry or window associated with the roller shutter, an upper board 12, a front board 13, and a lower board 14, said end flanges and boards being conventionally made of polyvinyl chloride (PVC).

However, the trunk 10 according to the invention differs from that of the prior art in that the rear 11, upper 12, front 13 and lower 14 boards are double walls each comprising at least one internal wall 11a, 12a, 13a , 14a, an outer wall 11b, 12b, 13b, 14b and a plurality of cells 11c, 12c, 13c, 14c extending longitudinally between said inner 11a, 12a, 13a, 14a and outer 11b, 12b, 13b, 14b walls .

The cells 11c, 12c, 13c, 14c of at least one of the rear 11, upper 12, front 13 and lower 14 boards have a cross section in the shape of a closed curve, of a polygon having at least one side inclined with respect to the wall internal 11a, 12a, 13a, 14a and/or external 11b, 12b, 13b, 14b associated (s) or closed hybrid line composed of an association of a curve and a polygon.

The term "inclined with respect to the associated internal and/or external wall" designates here the fact that the cross section of each cell comprises at least one side which is not parallel or not perpendicular to the associated internal and/or external wall or to the portion of the associated internal and/or external wall located close to said cell, in the case of an internal and/or external wall that is not entirely planar.

Given the specific shape of the rear 11, upper 12, front 13 and lower 14 boards and for obvious reasons of feasibility of their manufacture, it is clear that only a majority of the cells 11c, 12c, 13c, 14c may have a section transverse as previously described, without departing from the scope of the present invention.

Furthermore, the cells 11c, 12c, 13c, 14c advantageously have sections of different sizes and shapes.

So, with reference to the figure 2 , according to a first alternative embodiment of the trunk 10 according to the invention, the upper 12 and lower 14 boards comprise a majority of cells 12c, 14c in the shape of a hexagon and a pentagon.

Likewise, with reference to the picture 3 , according to a second alternative embodiment of the box 10′ according to the invention, the lower board 14′ comprises a majority of cells 14c′ in the shape of a circle. We understand that on the picture 3 only the lower board 14' is shown, but the other boards of the trunk 10' may also include a majority of cells in the shape of a circle.

The term "majority" here denotes the fact that the cells in the shape of a hexagon, a pentagon or a circle represent the largest set of cells among all the cells of the board(s) of the trunk 10, 10'.

On the figure 4 , to explain the phenomenon of acoustic insulation, the dissipation of acoustic energy has been represented during the passage of an incident sound wave S, coming from inside the trunk 10, through the various walls of the lower board 14 and cells 14c. Thus, the sound wave S coming from inside the trunk 10 will encounter the internal wall 14a of the lower board 14 of said trunk 10, part of its acoustic energy will then be reflected and the other part will be transmitted to the inside a first cell 14c. This transmitted energy will then be partly reflected on all the walls of this first cell 14c and the remaining part will be transmitted inside the other adjacent cells, and so on until a very small part of the acoustic energy of the initial incident sound wave S is transmitted through the outer wall 14b of the lower board 14 of said box 10 to the outside of the latter. Therefore, it is clear that a large number of cells with inclined sides and shapes (circle and / or hexagon and / or pentagon) and / or different dimensions promote the phenomenon of reflection / transmission and therefore the phenomenon of dissipation acoustic energy in the planks of the trunk 10 according to the invention, which has the effect of increasing the acoustic insulation of the latter. Furthermore, the fact of having cells with inclined sides avoids the generation of plane acoustic waves which also increases the acoustic performance of said box 10.

Consequently, the greater the number of cells with inclined sides and different shapes and/or dimensions, the greater the acoustic insulation of the box 10, 10'. It is therefore important to have at least a majority of cells with inclined sides and different shapes and/or dimensions.

Finally, we understand the fact that the rear 11, upper 12, front 13 and lower 14, 14 'boards of the trunk 10, 10' include cells 11c, 12c, 13c, 14c, 14c', also reinforces the mechanical resistance of said chest.

The trunk 10 according to the invention finds a particular application for containing a rolling shutter of a window.

Finally, it goes without saying that the examples of safes 10 in accordance with the invention which have just been described are only specific illustrations, in no way limiting the invention.

Claims (3)

1. Acoustic box (10, 10') for a roller shutter comprising at least rear (11), top (12), front (13) and bottom (14, 14') boards each including at least an inner wall (11a, 12a, 13a, 14a), an outer wall (11b, 12b, 13b, 14b) and a plurality of cells (11c, 12c, 13c, 14c, 14c') extending longitudinally between said inner (11a, 12a, 13a, 14a) and outer (11b, 12b, 13b, 14b) walls, said box (10, 10') being characterised in that the majority of the cells (11c, 12c, 13c, 14c, 14c') of at least the top (12) and bottom (14, 14') boards have a cross-section in the shape of a circle, or a hexagon and/or a pentagon having at least one inclined side with respect to the associated inner (11a, 12a, 13a, 14a) and/or outer (11b, 12b, 13b, 14b) wall or of a closed hybrid line made up of a combination of circle and a hexagon or pentagon.
2. Box (10, 10') according to claim 1 characterised in that the cells (11c, 12c, 13c, 14c, 14c') are sections of different sizes and shape.
3. Box (10, 10') according to any one of claims 1 or 2 characterised in that the rear (11), top (12), front (13) and bottom (14, 14') boards are made of polyvinyl chloride.

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