Roller shutter box including an internal longitudinal reinforcement structure

Abstract

The present invention relates to a roller shutter box (1) which comprises a reinforcement structure (20) attached to its lower wall (4) equipped with an attached joining and guiding profile (14), this roller shutter box (1) being characterized by the fact that it comprises: - a first assembly means (23) by hooking the front edge (21) of the reinforcement structure (20) onto the joining and guiding profile (14), and - a second assembly means (24) between said reinforcement structure (20) and another element of the box than said joining and guiding profile (14), advantageously said lower wall (4). Such a feature allows an operator to attach the reinforcement structure (20) after the roller shutter box (1) has been installed within the equipped building bay. Figure for the abstract: Figure 1

Description

Title of the invention: Roller shutter box comprising an internal longitudinal reinforcement structure Technical field of the invention

[0001] The present invention relates to the general technical field of roller shutter systems for closing a building bay.

[0002] It relates more particularly to roller shutter boxes intended to be installed at the level of the upper crosspiece of a joinery frame attached within the equipped building bay. State of the art

[0003] Certain roller shutter boxes, equipped with a roller shutter apron wrapped around an apron support shaft, are adapted to be fitted into the thickness of a building bay, between the lintel of the bay and the upper crosspiece of the frame of the associated joinery.

[0004] Once the assembly is installed, the roller shutter box and the upper crosspiece of the joinery can be subject to relatively significant forces. They can be subject in particular to horizontal pressure and depression phenomena which are generated by the wind, as well as vertical bending phenomena due to their respective weights.

[0005] These phenomena, which can cause deformations of the various constituent parts, are mainly encountered in very long joinery and chests.

[0006] In order to limit such deformations, certain roller shutter boxes include internal longitudinal or point reinforcement structures, fixed by screwing to the lower wall of the roller shutter box and to the upper crosspiece of the frame of the joinery.

[0007] Such reinforcement structures are generally provided during the manufacture of the roller shutter box, and they are present during the box installation operation.

[0008] However, if they are not present at the outset, if necessary, it is not always possible or easy to report them retrospectively.

[0009] There is therefore a need to have a roller shutter box capable of being equipped with such reinforcement structures, even after its installation within the building bay. Presentation of the invention

[0010] In order to overcome the aforementioned drawback of the state of the art, the present invention proposes a roller shutter box, intended to be installed at the level of the upper crosspiece of a joinery frame attached to a building bay, which roller shutter box includes an interior volume suitable for receiving a roller shutter apron wound around an apron support shaft,

[0011] which interior volume is delimited in particular by:

[0012] - an external front wall intended to be located on the exterior side of the building,

[0013] - an interior front wall, intended to be located on the interior side of the building, at at least a portion of said interior front wall being removable to form an access opening to said interior volume, and

[0014] - a lower wall, which lower wall, of general plane P, comprises a face internal oriented towards the interior volume of said roller shutter box, and an opposite external face, which lower wall also comprises a front longitudinal edge and a rear longitudinal edge, defining between them the width of said lower wall, said front longitudinal edge being associated with a connecting and guide profile,

[0015] which roller shutter box comprises assembly means for assembling said junction and guide profile with said upper crosspiece of the joinery frame,

[0016] which junction and guide profile extends opposite and at a distance from a lower edge of said external front wall to together delimit a longitudinal light adapted for the passage of the roller shutter apron,

[0017] which roller shutter box further comprises a reinforcement structure attached to the lower wall, which reinforcement structure is made of a material having mechanical resistance characteristics greater than those of said lower wall,

[0018] which reinforcement structure is delimited by a front edge of reinforcement structure intended to be located on the side of said junction and guide profile, and by a rear edge of reinforcement structure intended to be located on the side of said interior front wall,

[0019] and which reinforcing structure extends over the entire length, or substantially the entire length, of said lower wall,

[0020] said roller shutter box also comprising:

[0021] - a first means of assembly by hooking said front edge of the reinforcement structure on said junction and guide profile, and

[0022] - a second assembly means between said reinforcing structure and another element of the trunk than the said junction and guide profile.

[0023] Preferably, this other element of the trunk is the lower wall of the trunk.

[0024] The first assembly means allows assembly, by an operator, of a constituent part of the front edge of the reinforcement structure directly with a constituent part of the junction and guide profile, this remotely (in particular from the access opening in the interior front wall) and without requiring any tools or additional components.

[0025] The hooking assembly means may also consist of embedding or interlocking assembly means.

[0026] The second assembly means may be provided between the front and rear longitudinal edges of the lower wall of the trunk, and between the front and rear edges of the reinforcement structure, directly accessible by the operator from the access opening of the interior front wall.

[0027] Other non-limiting and advantageous characteristics of the roller shutter box according to the invention, taken individually or in all technically possible combinations, are the following:

[0028] - the second assembly means between the reinforcement structure and the lower wall includes at least one fixing screw;

[0029] - the first means of assembly by hooking is of the locking type by rotation of said reinforcement structure;

[0030] - the first hooking assembly means comprises (a) a long hook longitudinal with an arc-shaped section arranged on one of the elements among said front edge of the reinforcement structure and said junction and guide profile, and, (b) a longitudinal bead, complementary to said longitudinal hook, arranged on the other element among said front edge of said reinforcement structure and said junction and guide profile,

[0031] which longitudinal bead and which longitudinal hook are arranged:

[0032] (i) to allow the introduction of said longitudinal bead into said long hook horizontal when the rear edge of the reinforcement structure is moved away from the internal face of the lower wall,

[0033] (ii) then, to allow the pivoting of the reinforcing structure against said lower wall, and simultaneously the relative rotational movement of said longitudinal hook on said longitudinal bead, and

[0034] (iii) once the reinforcing structure is pressed against the lower wall, to prevent separation between said longitudinal hook and said longitudinal bead during a tensile force on the reinforcing structure in the direction of the inner front wall, parallel to the plane of the lower wall;

[0035] - the reinforcement structure comprises:

[0036] (a) a first reinforcing structure portion, which extends from said edge front of the reinforcement structure and which is pressed against said lower wall, and

[0037] (b) a second reinforcing structure portion extending from said first portion of reinforcement structure, up to said rear edge of reinforcement structure, which second part of reinforcement structure gradually moves away from said in- wall lower;

[0038] - the reinforcement structure comprises a bottom face oriented towards the top face of said lower wall,

[0039] and the second assembly means between the reinforcement structure and the lower wall comprises:

[0040] (a) a fixing lug which projects from said bottom face, and

[0041] (b) at least one fixing screw for fixing said fixing lug with said lower wall;

[0042] - the fixing lug extends from the second part of the reinforcement structure;

[0043] - the fixing lug is made in one piece and extends at right angles or substantially at right angles the square from the second part of the reinforcement structure;

[0044] - the fixing lug comprises a plurality of holes or pre-holes for the positioning of the fixing screws;

[0045] - the roller shutter box comprises a block of removable insulating material arranged in facing the interior front wall, a lower part of this block of insulating material coming to bear against a part of the underside of the second part of the reinforcement structure and against the fixing lug.

[0046] Of course, the various features, variants and embodiments of the invention may be combined with each other in various combinations to the extent that they are not incompatible or mutually exclusive. Detailed description of the invention

[0047] Furthermore, various other characteristics of the invention emerge from the appended description given with reference to the drawings which illustrate a non-limiting form of embodiment of the invention and where:

[0048] [Fig-1] is a schematic cross-sectional view of a roller shutter box in accordance with the invention;

[0049] [Fig.2] is an enlarged view of detail A of the roller shutter box illustrated in the [Fig.l];

[0050] [Fig.3] is a schematic truncated perspective view of the roller shutter box illustrated in Figures 1 and 2;

[0051] [Fig.4] is a schematic view illustrating a stage of the assembly of the structure of reinforcement of the roller shutter box in figures 1 to 3.

[0052] The roller shutter box 1 according to the invention, shown in Figures 1 to 3, is adapted to be installed in a bay (or opening) made through a building wall.

[0053] This roller shutter box 1 is intended to be installed between the upper crosspiece T of a joinery frame (shown in dotted lines) and the upper part of the bay formed through the building wall (not shown).

[0054] This upper crosspiece T of the frame consists here of a profile which comprises two right-angled faces, namely: - a horizontal upper face T1, oriented towards the upper part of the bay, and - a vertical front face T2, oriented towards the outside.

[0055] The upper part of the bay may consist of a lintel equipped with a rebate capable of receiving the roller shutter box 1.

[0056] The building wall, and the associated carpentry, ensure the separation between an interior space and an exterior space, which are designated respectively by the references “I” and “E” in Figures 1 and 3.

[0057] The roller shutter box 1 surrounds a roller shutter apron (not shown), at least partially and preferably almost entirely, which winds and unwinds around a roller shutter shaft marked A in Figures 1 and 3. The roller shutter shaft A is associated with means for driving it in rotation around an axis of rotation AL

[0058] This roller shutter box 1 comprises for this purpose a set of four longitudinal walls, namely:

[0059] (i) two vertical front walls 2, 3 which extend at a distance from and opposite one of the other, namely - an interior front wall 2 (or “rear wall”) intended to be located on the interior side I of the building and - an exterior front wall 3 (or “front wall”) intended to be located on the exterior side E of the building;

[0060] (ii) a horizontal lower wall 4, of general plane P, commonly called “underside”, which comes below the roller shutter shaft A on which the roller shutter apron is wound, and which delimits, with the external front wall 3, an opening 5 for the passage of this roller shutter apron between its folded / deployed configurations, and

[0061] (iii) a horizontal upper wall 6, coming above the attached roller shutter apron, and extending at a distance from and opposite the lower wall 4.

[0062] The roller shutter box 1 is further delimited on the sides by two end side walls 7 (one of which is shown in [Fig.3]), consisting here of parts called “flasks” or “end pieces”.

[0063] The four longitudinal walls 2, 3, 4, 6, and the two end side walls 7 are assembled by any suitable means (interlocking, screwing, fixing brackets, etc.) and together they delimit the interior volume V of the roller shutter box 1.

[0064] The distance D which separates the inner front wall 2 and the outer front wall 3 defines the width of the inner volume V; The distance B which separates the lower wall 4 and the upper wall 6 defines the height of the inner volume V; and the distance which separates the two end walls 7 defines the length of the inner volume V.

[0065] The different walls 2, 3, 4, 6 and 7 of the roller shutter box 1 consist here of parts made of a thermally insulating thermoplastic material, for example poly(vinyl chloride) (or PVC).

[0066] In particular, the longitudinal walls 2, 3, 4 and 6 advantageously consist of profiles which are manufactured by extrusion.

[0067] Alternatively, these walls 2, 3, 4, 6 and 7 can be made of any other suitable material, for example wood or a thermoplastic material other than PVC.

[0068] The lower wall 4 comprises two opposite rectangular faces 10 and 11, namely:

[0069] - an internal face 10, oriented towards the inside of the roller shutter box 1 and opposite of the upper wall 6, and

[0070] - an opposite external face 11, oriented towards the outside of the roller shutter box 1.

[0071] This lower wall 4 still has a rectangular outline which is formed by - two longitudinal edges, one front 12 and the other rear 13, and - two transverse edges (not visible), which extend to the end side walls 7.

[0072] As can be seen in Figures 1 and 2, the lower wall 4 of the roller shutter box rests on the upper face T1 of the upper crosspiece T of the joinery frame.

[0073] The front longitudinal edge 12 and the rear longitudinal edge 13 define between them the width L of the lower wall 4.

[0074] A junction and guide profile 14, added, is assembled with the front longitudinal edge 12 of the lower wall 4 to stiffen the structure, ensure assembly with the upper crosspiece T of the joinery and optimize the guidance of the roller shutter apron.

[0075] This joining and guiding profile 14 extends over the entire or practically the entire length of the front longitudinal edge 12 of the lower wall 4; and it is assembled with this front longitudinal edge 12 by any suitable means, for example by fitting and screwing.

[0076] The joining and guiding profile 14 comprises a first wing 141 and a second wing 142, which extend at right angles to each other, and which are connected by a connecting part 143 forming its angle.

[0077] The first wing 141 is positioned on the lower wall 4, against its internal face 10; and it is assembled with the lower wall 4, for example by means of screws (not shown) arranged at the level of a longitudinal groove 141a.

[0078] The second wing 142 extends at right angles, or substantially at right angles, to the first wing 141. It extends on the side of the external face 11 of the lower wall 4, and projects relative to the plane of the latter, to come to bear against the vertical front face T2 opposite the upper crosspiece of the frame T.

[0079] This second wing 142 comprises a front face provided with at least one longitudinal groove, for the positioning of fixing screws, with a view to fixing it against the facing face T2 of the associated upper sleeper crosspiece T (figures 1 and 2).

[0080] In the illustrated embodiment, fixing screws shown diagrammatically by the reference 15 ensure the fixing of the second wing 142 on the upper crosspiece of the frame T, this at the level of a first longitudinal groove 142a; and other fixing screws (not shown), can complete this fixing, this at the level of a second longitudinal groove 142b.

[0081] The connecting part 143, connecting the two wings 141 and 142, consists of a slightly curved convex wall which has a sliding surface.

[0082] This connecting part 143 constitutes one of the longitudinal edges of the longitudinal light 5 for the passage of the roller shutter apron and it serves as a guide for the latter. The sliding surface of this connecting part 143 is adapted to limit the friction of the roller shutter apron during its maneuver between its deployed and retracted positions.

[0083] The apron guide profile 14 here consists of a profile made of metal or plastic.

[0084] The other longitudinal edge of the longitudinal light 5 for the passage of the roller shutter apron is constituted by a lower longitudinal edge 3a of the external front wall 3.

[0085] The interior front wall 2 is designed to be removable to create an access opening O located on the interior side I of the building, allowing an operator to access the interior volume V of the box, in particular for maintenance operations on the roller shutter.

[0086] For this, the lower longitudinal edge 2a of this inner front wall 2 and the upper longitudinal edge 2b of this inner front wall 2 may comprise elastic fitting means adapted to cooperate with complementary elastic fitting means provided at the level of the facing ends, respectively, of the lower wall 4 and the upper wall 6.

[0087] As can be seen in Figures 1 and 3, the roller shutter box 1 also incorporates a block 16 made of insulating material, for example polystyrene, added here in the interior volume V and on the side of the interior front wall 2 (in this case slightly set back, a few millimeters or centimeters from the latter).

[0088] This block 16 of insulating material is delimited by a set of surfaces, and in particular a front surface 16a which is oriented opposite the external front wall 3, and which here has a concave section in an arc of a circle (centered or practically centered on the axis A1 of the roller shutter shaft A), so as to optimize the insulation characteristics. The block 16 of insulating material occupies the entire height and the entire length of the interior volume V of the roller shutter box 1.

[0089] The insulating block 16 is designed to be removable and it has the possibility of being removed from the interior volume V of the trunk, in particular through the aforementioned access opening O, after removal of the interior front wall 2.

[0090] The roller shutter box 1 according to the invention is equipped with an internal reinforcement structure 20, attached to the lower wall 4, and which has the function of increasing the rigidity of the roller shutter box 1 and of the associated upper crosspiece T, ensuring - effective resistance to deformations linked to horizontal / vertical bending phenomena, and - an increase in their inertia.

[0091] The reinforcement structure 20 is therefore made of a material having mechanical resistance characteristics greater than those of the associated lower wall 4.

[0092] By “mechanical strength characteristics” is meant in particular tensile strength and bending strength.

[0093] In this case, this reinforcement structure 20 is in the general form of a plate made of a rigid material, for example metal sheet, and more particularly folded steel sheet or extruded aluminum.

[0094] The reinforcement structure 20 comprises a top face 20a which is oriented towards the internal volume V, or towards the roller shutter shaft A, and a bottom face 20b which is oriented towards the lower wall 4.

[0095] This reinforcement structure 20 is delimited by a front edge of reinforcement structure 21 intended to be located on the side of the junction and guide profile 14, and by a rear edge of reinforcement structure 22 intended to be located on the side of the internal front wall 2; and it extends over the entire length, or practically the entire length, of the lower wall 4.

[0096] An objective of the present invention is to allow an operator to attach this reinforcement structure 20 and fix it within the internal volume V by passing through the access opening O, after the installation of the joinery and its roller shutter box 1.

[0097] For this, the roller shutter box 1 comprises: - a first assembly means 23 by hooking the front edge of the reinforcement structure 21 onto the junction and guide profile 14, and - a second assembly means 24 between the reinforcement structure 20 and the lower wall 4.

[0098] In the embodiment illustrated in the figures, the first assembly means 23 by hooking is of the type with rotational locking of the reinforcement structure 20.

[0099] More precisely, as can be seen in [Fig.2], this first assembly means 23 by attachment comprises:

[0100] - a longitudinal hook 231 with an arcuate section arranged on the front edge 21 of the reinforcement structure 20 and

[0101] - a longitudinal bead 232, complementary to the longitudinal hook 231, provided on the connecting and guiding profile 14.

[0102] The longitudinal bead 232 is here formed in one piece on the first wing 141 of the junction and guide profile 14.

[0103] In an alternative embodiment, the longitudinal hook and the longitudinal bead can be reversed on the front edge of the reinforcement structure 21 and on the junction and guide profile 14.

[0104] The longitudinal bead 232 and the longitudinal hook 231 are arranged:

[0105] - to allow the introduction of the longitudinal bead 232 into the long hook gitudinal 231 when the rear edge 22 of the reinforcing structure 20 is spaced from the internal face 10 of the lower wall 4, in the manner illustrated in [Fig.4];

[0106] - then, to allow the pivoting of the reinforcement structure 20 against the wall in lower 4 (in the manner illustrated by the orientation arrow F in [Fig.4]), and, simultaneously, allow the relative rotational movement of the longitudinal hook 231 on the longitudinal bead 232, and

[0107] - once the reinforcement structure 20 is supported against the lower wall 4 (position illustrated in figures 1 and 2), to prevent the longitudinal hook 231 from separating from the longitudinal bead 232 during a tensile force on the reinforcing structure 20 in the direction of the inner front wall 2, parallel to the plane P of the lower wall 4.

[0108] In alternative embodiments, the hooking assembly means may comprise nesting or embedding structures.

[0109] In Figures 1, 3 and 4, it can be seen that the reinforcement structure 20 does not consist of a flat plate of material, but that it has a part whose section is in an arc of a circle, in particular to adapt to the winding of the deck and to gain height to increase the inertia of the profile.

[0110] More specifically, the reinforcement structure 20 comprises:

[0111] - a first part of reinforcement structure 25, which extends from the edge front of reinforcement structure 21; this first part of reinforcement structure 25 is flat and it is pressed against the lower wall 4 (more particularly against its flat internal face 10), and

[0112] - a second part of reinforcement structure 26 which extends from said first part of reinforcement structure 25, up to the rear edge of reinforcement structure 22; this second part of reinforcement structure 26 has a section in the form of an arc of a circle centered on the axis Al of the shaft A of the roller shutter apron, and it gradually moves away from the lower wall 4.

[0113] The second assembly means 24 between the reinforcement structure 20 and the in- lower wall 4 here comprises a fixing lug 27 which projects from the underside, and at least one fixing screw 28 for assembling this fixing lug 27 with the lower wall 4 of the roller shutter box 1.

[0114] The fixing lug 27 is made in one piece with the reinforcement structure 20; it extends at right angles or substantially at right angles from the underside 20b of the reinforcement structure 20, and more precisely from the second part of the reinforcement structure 26.

[0115] The fixing lug 27 extends over the entire length of the reinforcing structure 20. Its length (or height) is adapted so that once the reinforcing structure 20 is correctly positioned, the end of this fixing lug 27, and the first part of the reinforcing structure 25, are in contact with the top face 10 of the lower wall 4.

[0116] The fixing lug 27 comprises a plurality of holes or pre-holes, or a simple groove, for the positioning of the fixing screws 28.

[0117] Such a reinforcement structure 20 can be put in place after the roller shutter has been installed within its receiving bay.

[0118] To do this, as illustrated in [Fig.4], the operator intervenes on the interior side I of the building and can create the access opening O by removing the interior front wall 2 and removing the block 16 of insulating material; the roller shutter apron is lowered (unrolled) to facilitate the intervention.

[0119] The operator can then bring back the reinforcement structure 20 and manipulate it from its rear edge 22, from the access opening O.

[0120] More precisely, it raises the rear edge 22 of the reinforcement structure 20 in the direction of the shaft A of the roller shutter, which makes it possible to embed or hook the longitudinal hook 231 of its front edge 21 onto the longitudinal bead 232 of the joining and guiding profile 14 (due to the conformation / structure of the longitudinal hook 231 and the longitudinal bead 232).

[0121] Once this embedding / hooking has been carried out, the operator lowers the reinforcement structure 20 by pivoting it around the axis formed by the longitudinal hook 231 / longitudinal bead 232 pair (which then forms a sort of hinge or a ball joint), until the first part of the reinforcement structure 25 and the end of the fixing lug 27 come to bear against the top face 10 of the lower wall 4 of the trunk.

[0122] As explained previously, the longitudinal hook 231 and the longitudinal bead 232 are structured so that once the reinforcing structure 20 is resting on the lower wall 4, the longitudinal hook 231 cannot be separated from the longitudinal bead 232 by traction in the direction of the inner front wall 2, exerted parallel to the plane P of the lower wall 4.

[0123] The fixing lug 27 of the reinforcement structure 20 is then positioned close to the access opening O of the roller shutter box, and the operator can access it to finalize the fixing of the reinforcement structure 20 on the lower wall 4 by means of the fixing screws 28 which he can put in place with a manual screwdriver or an electric screwdriver / screwdriver.

[0124] As can be seen in [Fig.l], the fixing screws 28 are implanted at approximately 45° in the lower wall 4, relative to the plane P of the latter, perpendicular to the plane of the fixing lug 27.

[0125] The operator can then replace the block 16 of insulating material by simple manual embedding, then the interior front wall 2 by elastic fitting.

[0126] In Figures 1 and 3, it can be seen that the lower part of the front surface 16a of the block 16 of insulating material is pressed against the underside of the second part 26 of the reinforcement structure 20 and against the opposite face of the fixing lug 27, this to optimize the insulation characteristics.

[0127] In Figures 1 and 3, it can be seen that the front surface 16a of the block 16 of insulating material comprises a protrusion 161 under which the free end of the rear edge 22 of the reinforcing structure 20 is housed.

[0128] This feature makes it possible to ensure the “encasing”, or integration, of the reinforcement 20 in the block 16 of insulating material, despite possible differences in positioning of the junction and guide profile 14.

[0129] In an alternative embodiment, the fixing screws of the second assembly means can be replaced by embedding means arranged for force-fitting of the rear edge of the reinforcement structure 20 into a suitable receiving housing provided in the internal face of the lower wall 4.

[0130] Still in an alternative embodiment, the second assembly means can be provided between the reinforcement structure 20 and another element of the trunk than the lower wall 4, for example the end side walls 7.

Claims

Claims

1. Roller shutter box (1), intended to be installed at the level of the upper crosspiece (T) of a joinery frame attached within a building bay, which roller shutter box (1) comprises an interior volume (V) adapted for receiving a roller shutter apron wound around a roller shutter shaft (A) supporting the apron, which interior volume (V) is delimited in particular by: - an external front wall (3) intended to be located on the exterior side (E) of the building, - an interior front wall (2), intended to be located on the interior side (I) of the building, at least part of said interior front wall (2) being removable to form an access opening (O) to said interior volume (V), and - a lower wall (4), which lower wall (4), of general plan (P), comprises an internal face (10) oriented towards the internal volume (V) of said roller shutter box (1), and an opposite external face (11), which lower wall (4) also comprises a front longitudinal edge (12) and a rear longitudinal edge (13), defining between them the width (L) of said lower wall (4), said front longitudinal edge (12) being associated with a connecting and guiding profile (14) added, which roller shutter box (1) comprises assembly means (15) for assembling said connecting and guiding profile (14) with said upper crosspiece (T) of the joinery frame, which connecting and guiding profile (14) extends opposite and at a distance from a lower edge (3a) of said external front wall (3) to delimit together a longitudinal light (5) adapted for the passage of the roller shutter apron,which roller shutter box (1) further comprises a reinforcing structure (20) attached to the lower wall (4), which reinforcing structure (20) is made of a material having mechanical resistance characteristics greater than those of said lower wall (4), which reinforcing structure (20) is delimited by a front edge (21) of reinforcing structure intended to be located on the side of said junction and guide profile (14), and by a rear edge (22) of reinforcing structure intended to be located on the side of said inner front wall (2), and which reinforcing structure (20) extends over the entire length, or practically the entire length, of said lower wall (4), said roller shutter box (1) being characterized in that it comprises: - a first assembly means (23) by hooking said front edge of the reinforcing structure (20) onto said junction and guide profile (14), and - a second assembly means (24) between said reinforcing structure (20) and another element of the box than said junction and guide profile (14).

2. Roller shutter box (1) according to claim 1, characterized in that said second assembly means (24) consists of an assembly means between said reinforcing structure (20) and said lower wall (4).

3. Roller shutter box (1) according to claim 2, characterized in that said second assembly means (24) between said reinforcing structure (20) and said lower wall (4) comprises at least one fixing screw (28).

4. Roller shutter box (1) according to any one of claims 1 to 3, characterized in that said first assembly means (23) by hooking is of the type for locking by rotation of said reinforcement structure (20).

5. Roller shutter box (1) according to claim 4, characterized in that said first assembly means (23) by hooking comprises: - a longitudinal hook (231) with an arcuate section arranged on one of the elements among (a) said front edge (21) of the reinforcement structure (20) and (b) said junction and guide profile (14), and, - a longitudinal bead (232), complementary to said longitudinal hook (231), arranged on the other element among (a) said front edge (21) of said reinforcement structure (20) and (b) said junction and guide profile (14), which longitudinal bead (232) and which longitudinal hook (231) are arranged: - to allow the introduction of said longitudinal bead (231) into said longitudinal hook (232) when the rear edge (22) of the reinforcement structure (20) is moved away from the internal face (10) of the lower wall (4), - then,to allow the pivoting of said reinforcing structure (20) against said lower wall (4), and simultaneously the relative movement, rotation of said longitudinal hook (231) on said longitudinal bead (232), and - once the reinforcing structure (20) is supported against the lower wall (4), to prevent separation between said longitudinal hook (231) and said longitudinal bead (232) during a tensile force on the reinforcing structure (20) in the direction of the inner front wall (2), parallel to the plane (P) of the lower wall (4).

6. Roller shutter box (1) according to any one of claims 1 to 5, characterized in that said reinforcing structure (20) comprises: - a first reinforcing structure part (25), which extends from said front edge of reinforcing structure (21) and which is pressed against said lower wall (4), and - a second reinforcing structure part (26) which extends from said first reinforcing structure part (25), to said rear edge of reinforcing structure (22), which second reinforcing structure part (26) gradually moves away from said lower wall (4).

7. Roller shutter box (1) according to any one of claims 1 to 6, characterized in that said reinforcing structure (20) comprises a bottom face (20b) oriented towards the top face (10) of said lower wall (4), and in that said second assembly means (24) between said reinforcing structure (20) and said lower wall (4) comprises: - a fixing lug (27) which projects from said bottom face (20b), and - at least one fixing screw (28) for fixing said fixing lug (27) with said lower wall (4).

8. Roller shutter box (1) according to claim 7 taken under the dependency of claim 6, characterized in that said fixing lug (27) extends from said second part of reinforcement structure (26).

9. Roller shutter box (1) according to claim 8, characterized in that said fixing lug (27) is made in one piece and extends at right angles or substantially at right angles from said second part of the reinforcing structure (26).

10. Roller shutter box (1) according to any one of claims 7 to 9, taken under the dependency of claim 6, characterized in that it comprises a block (16) of insulating material, removable, arranged opposite said inner front wall (2), a lower part of said block (16) of insulating material bearing against a part of the underside of the second part of the reinforcing structure (26) and against said fixing lug (27).

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