Ventilation grille

Abstract

Ventilation grille (1), comprising a frame (10) carrying blades (20) providing ventilation passages (5), the frame (10) comprising assembled frame sections (11), in particular four assembled frame sections (11), each frame section (11) comprising at least one groove (16), in particular two grooves (16), and being connected in pairs at their ends by a fixing bracket (15) configured to allow assembly and disassembly of the frame (10), the fixing bracket (15) being fixed in the grooves (16) of the corresponding frame sections (11) by screwing and optionally by bonding, the bonding being intended to be injected between the bracket and the frame sections through a passage in the fixing bracket provided for this purpose. Figure for the abbreviation: Fig. 2a

Description

Title of the invention: Ventilation grille technical field

[0001] The present invention relates to the field of ventilation grilles, particularly custom-made ones, for buildings, especially those made of extruded aluminum profiles. It can be fixed to a ventilation duct for suction or discharge, or to a simple air inlet for a technical room or cellar, and be directly exposed to the elements. Previous technique

[0002] Building ventilation grilles are known, which comprise a frame supporting blades. Such grilles are known, for example, by the following references and companies: Lindab ® WLA-11 and WLA-22, France Air ® GEA, DucoGrille Classic, Solid and Close, PANOL DS ALU and Renson ® 411.

[0003] However, these grids can be expensive or require complex or inflexible assembly.

[0004] There is a need to improve the design, assembly, and maintenance of ventilation grilles, and to increase their durability and safety. Summary of the invention

[0005] The invention aims to meet this need and thus relates to a ventilation grille, comprising a frame carrying blades providing ventilation passages, the frame comprising assembled frame parts, in particular four assembled frame parts, the frame parts each comprising at least one groove, in particular two grooves, and being connected in pairs at their ends by a fixing bracket configured to allow the assembly and disassembly of the frame.

[0006] According to the invention, the fixing bracket can be fixed in the grooves of the corresponding frame parts by screwing and optionally by gluing, the glue being intended to be injected between the bracket and the frame parts through a passage in the fixing bracket provided for this purpose.

[0007] Thanks to the invention, the ventilation grille is completely removable and re-mountable; the frame parts and the mounting bracket do not undergo plastic deformation during grille assembly. Thus, it is possible and easy to replace any part of the grille if necessary. Ordinary tools can be used; no special tools are required.

[0008] The precision and speed of assembly are improved. The use of the bracket and its screwing allow for extremely efficient and repeatable self-tightening, i.e., it can be disassembled and reassembled.

[0009] In addition, the frame can be cut to size, to the required dimensions.

[0010] The invention increases the durability of the ventilation grille and provides numerous advantages, notably thanks to the robustness of the various parts of the ventilation grille; the demountable and interchangeable nature of all the parts of the ventilation grille, which guarantees its repairability indefinitely; the standardization of certain parts of the ventilation grille, in particular their conformity to European standards; a high-performance blade mounting system to facilitate their assembly and delay break-ins due to the removal or dismantling of the blades; accessories that facilitate the installation of the grille while ensuring excellent mechanical strength; optimized aerodynamic behavior, allowing for a reduction in the initial investment of the building's ventilation systems as well as the energy consumption associated with its use;Finally, it offers notable effectiveness in protecting the building from the elements, particularly against water entering through ventilation openings.

[0011] The invention also improves safety, as the ventilation grille has good resistance to being pulled out, which limits damage and helps to secure the building where it is installed. This also further increases durability.

[0012] The ventilation grille according to the invention is intended for use in a ventilation system or duct. Alternatively, it can be used without a duct, for example, on a cellar or utility room opening, or on cladding. The ventilation grille can be fixed to a ventilation duct for suction or discharge, or to a simple air inlet for a utility room or cellar. The ventilation grille is generally directly exposed to the elements.

[0013] The ventilation grille according to the invention can advantageously be fixed to a pipe without necessarily needing to access the inside of the pipe. Description of the invention Bracket

[0014] The fixing bracket may have two wings oriented at 90° to each other, with an angle of 90° between them. Each of the wings may be approximately 50 mm long.

[0015] The fixing bracket may have a passage for injecting the glue formed in one of its corners. The passage may be through, leading from one face to the other. of the fixing bracket. It can extend along an axis oriented at 45° to the two wings of the fixing bracket.

[0016] The fixing bracket can be made of aluminium or aluminium alloy, for example zamak.

[0017] The mounting bracket may have at least one, or even two, lateral shoulders. The two lateral shoulders may be configured to cooperate with edges of the corresponding frame portion that define the groove, allowing the mounting bracket to be held in the groove.

[0018] A fixing bracket may include a clamping system activated by means of a screwdriver. The clamping system tightens the bracket onto the edge of the frame section.

[0019] In one embodiment, the fixing bracket can be fixed in the grooves of the corresponding frame parts by screwing and gluing, the glue being intended to be injected between the bracket and the frame parts through a passage in the fixing bracket provided for this purpose.

[0020] The use of glue provides better sealing and resistance for the ventilation grille, while avoiding any waste of glue. It is optional, however, as the mechanical strength of the tightening screws of the bracket is sufficient on its own to ensure the assembly of the ventilation grille. Part of frame

[0021] The frame sections can each be straight. They can be straight profiles. The frame section profile can be cut, particularly to measure, at 45° before assembly with the other frame sections.

[0022] The ventilation grille may include a lower frame part, an upper frame part, and two side frame parts.

[0023] The frame parts can be fully disassembled and reassembled; the frame parts do not undergo plastic deformation during the assembly of the grille. They are interchangeable.

[0024] The frame parts may each include a portion of a groove in which are provided the groove or grooves intended to receive the fixing bracket.

[0025] The frame parts may further each include a protective portion which may extend perpendicularly to the groove portion when the frame part is observed in cross-section.

[0026] The protective portion can extend, when the frame part is viewed in cross-section, over a length L which can vary. In the case where the ventilation grille is intended to be installed in a so-called tunnel installation, slid inside a duct, the length L can be small, for example less than 20 mm, or even less than 15 mm, preferably less than 10 mm, for example being on the order of 30 mm. In the case where the ventilation grille is intended to be installed in a so-called surface or covering of a wall, the length L can be large, for example greater than 5 mm, or even greater than 10 mm, better than 20 mm, for example being around 22 mm.

[0027] Thanks to the shape of the frame parts in cross-section, the rigidity of the ventilation grille according to the invention is improved, as is its durability, without its mass being increased too much.

[0028] The specific stiffness of the frame profiles, defined as the ratio of the force applied to the profile divided by the product of the measured deflection and the linear mass of the profile, can, for example, reach a value of 1.70 for a tunnel frame and 4.4 for a wall-mounted frame. The deflection of a frame section profile, 1.3 m long and spanning 0.3 m with a 1 m overhang, under the effect of a 1 kg force placed at its end, can, for example, be only 21 mm for a tunnel frame and only 7 mm for a wall-mounted frame. The second moment of area of ​​the frame sections is improved. For the same ventilation grille size, particularly its length and width, the grille frame is more rigid.

[0029] A frame part may have two parallel grooves, which can make the frame more rigid, even with large dimensions.

[0030] In one embodiment, a single fixing bracket is placed at each corner of the frame; in this case, the bracket can be placed in the groove closest to the outside. The grid can have four fixing brackets.

[0031] For frames with dimensions for example less than 700 mm, a single bracket can be used at each corner of the frame.

[0032] A frame part may include two parallel grooves, two consecutive frame parts being connected to each other by two fixing brackets fixed parallel to each other.

[0033] In one embodiment, a single fixing bracket per corner of the frame may be sufficient. However, it may be useful to have two fixing brackets per corner of the frame, particularly when the frame exceeds certain dimensions, for example, greater than 700 x 700 mm. For frames with dimensions greater than 700 mm, and potentially reaching dimensions of 2300 x 3000 mm, the brackets can be doubled at each corner. Thus, two brackets can be used at each corner of the frame. The grid can have eight fixing brackets.

[0034] In accordance with the European standard for the shape and size of the groove, Eurogroove, the dimensions of the groove are characterized by the opening and the width at the bottom of the groove. They can be 10x14.5 mm, 12x15 mm, 13.6x16.8 mm, 15x20 mm, or 14x18 mm. This allows for the accommodating of elements standardized hardware such as fasteners or hinges, to make the grille an opening.

[0035] Each frame portion may include a fastening portion, to which a blade support, which will be described below, may be attached. The fastening portion may extend perpendicularly to the groove portion and parallel to the protective portion when the frame portion is viewed in cross-section. Blade support

[0036] The ventilation grille may also include at least one blade support, in particular two blade supports, in particular on either side of the blades.

[0037] The blade support(s) can each be straight. They can be straight profiles.

[0038] A blade support can be fixed on each of two opposite frame parts, and / or possibly on a stiffener, installed as reinforcement inside the frame, in particular by clinching.

[0039] Preferably, this refers to the two lateral frame parts, which are intended to be placed vertically once the ventilation grille is in place in the ventilation duct.

[0040] The two other frame parts, lower and upper, may be without a blade support. Preferably, these are the two frame parts intended to be placed horizontally once the ventilation grille is in place in the ventilation duct.

[0041] Each blade support can be fixed to a fixing portion of the corresponding frame part.

[0042] The blade support can be attached to the corresponding frame section by clinching, as it is notably rivet-free. This assembly operation is simple, quick, and economical due to the absence of rivets.

[0043] The blade support(s) are mounted on each of two lateral frame sections; they undergo plastic deformation during grid assembly, particularly due to clinching. If necessary, they can be removed by drilling through the ridges caused by clinching and can be replaced or reinstalled with rivets.

[0044] The blade support may include a plurality of hooks and blade holders, arranged alternately, one hook and one blade holder being configured to receive a blade.

[0045] A blade can be received in the blade holder by being inserted under the hook and clicked into the blade holder. Each blade can cooperate with a hook and a blade holder located just below the hook.

[0046] The blade support hook may have a comma-shaped rounded form adapted to accommodate and retain the top of the blade profiles, in a gutter shape, making it possible to prevent water from entering behind the ventilation grille.

[0047] The installation of a blade may include a first step of inserting the top of the blade under the hook, then a second step of snapping a hook of the blade into a return arranged at the end of the corresponding blade holder.

[0048] The hook and the blade holder intended to receive the same blade can be separated by a distance d between 20 and 32 mm, or even between 22 and 30 mm, better between 24 and 28 mm, being for example about 27.4 mm.

[0049] The blade holder and the hook intended to receive two consecutive blades can be separated by a distance a of between 2 and 12 mm, or even between 4 and 10 mm, better between 6 and 8 mm, being for example about 6.6 mm.

[0050] The blade support can carry between 3 and 9 blades, or even between 4 and 8 blades, better between 5 and 7 blades, for example 6 blades.

[0051] The blade support hook may have a comma-shaped, rounded form to accommodate the top of the gutter blade profiles; it may also have a return at its end. In particular, each blade support hook may have a return configured to cooperate with an upper hook of the corresponding blade.

[0052] The cooperation of the upper blade hook with the return of the blade support hook prevents the blade from sliding downwards. This provides resistance to being pulled out. This gives the ventilation grille improved burglar resistance.

[0053] The blade support hook is in the shape of a portion of a circle, it does not have a flattened portion.

[0054] The blades can simply be clicked into the blade holder, in a simple and removable manner.

[0055] The assembly can be anti-pull-out, due to the cooperation of the lower hook of the blade with the return of the blade holder.

[0056] Alternatively, the blades can be riveted to the blade support, which can be advantageously considered as a backup solution for reattaching a blade to a blade support when the connecting elements between the two are damaged or when anti-tear-off securing of the grid proves necessary.

[0057] A hook and a blade holder intended to receive two consecutive blades can be separated by a cutting point allowing the blade support to be cut.

[0058] The cutting point allows for easy, clean and precise cutting of the blade support, at a precise point located between a hook and the next blade holder, at the base of the blade holder.

[0059] The cutting point is defined by a narrowing of the blade support.

[0060] The distance bl between the cutting point and the nearest hook can be between 2 and 17 mm, or even between 3 and 13 mm, better between 4 and 7 mm, being for example about 5.4 mm.

[0061] The distance b2 between the cutting point and the nearest blade holder can be between 0 and 16 mm, or even between 0.5 and 8 mm, better between 1 and 2 mm, being for example about 1.2 mm.

[0062] Whether on a given blade support or at the junction of two successive blade supports, the distance between a blade holder and the next hook of a blade support can be small, with a difference of less than 4 mm, or even less than 3 mm, better less than 2 mm, being for example on the order of 0.4 mm.

[0063] Thanks to the choice of these gaps, the blade support can be cut to the desired length without wasting material or creating unnecessary stock, which is economical. The cut-off piece can also be used on a ventilation grille that is subsequently assembled. This allows for the reuse of blade support offcuts from one grille to another.

[0064] In one embodiment, the distance between a blade holder and the subsequent hook of a blade support can be substantially always the same. Such a configuration allows for the reuse of blade support offcuts.

[0065] Furthermore, the presence of a hook at the beginning and end of each blade support also allows for end-to-end assembly of successive blade supports on the frame, which aims to secure the gap between two successive blades, limited by the play in the hooks. This play can be less than 4 mm, or even less than 3 mm, preferably less than 1 mm, being, for example, on the order of 0.4 mm. Blades

[0066] The ventilation grille may include a plurality of blades, in particular so-called standard blades which make up the bulk of the plurality of blades.

[0067] The blade(s) can each be straight. They can be straight profiles.

[0068] The blade(s) are fully removable and re-mountable; the blades do not undergo No plastic deformation occurs during grid assembly. The blades may undergo elastic deformation during mounting on the grid.

[0069] The plurality of blades may also include, in addition to the so-called standard blades that make up the bulk of the plurality of blades, at least one upper blade, in particular a single upper blade, which is the blade intended to be positioned above the other blades. The upper blade may be positioned along a portion of the frame placed horizontally at the top of the ventilation grille. The upper blade includes an extension portion of the upper hook, which may allow it to be brought closer to the frame. The extension portion allows it to extend The upward slope of the slats provides protection, particularly from rain and other inclement weather, and minimizes airflow over the top slat. This also minimizes the gap between the top slat and the frame, resulting in a clean, aesthetically pleasing finish for the grille.

[0070] The plurality of blades may also include, in addition to the so-called standard blades that make up the bulk of the plurality of blades, at least one lower blade, in particular a single lower blade, which is the blade intended to be positioned below the other blades. The lower blade may be positioned along a portion of the frame placed horizontally at the bottom of the ventilation grille.

[0071] Depending on the frame height, the lower blade can be adapted to various lengths. It can be elongated, standard, or shortened, with a lower vertical portion extending to a greater or lesser extent. The vertical portion extends vertically when the lower blade is viewed in a plane transverse to it. The vertical portion can thus be flush with the horizontally positioned portion of the frame at the bottom of the ventilation grille, regardless of the frame height. This can, for example, advantageously protect the ventilation grille from rain or other inclement weather and minimize airflow below the lower blade, giving the grille an aesthetically pleasing finish. The gap between the lower blade and the frame is thus minimized.

[0072] The lower blade can alternatively be shortened, thus being devoid of such a vertical portion, which can prevent the blade from being easily grasped.

[0073] At least one, or even all, of the ventilation grille blades may include an upper hook, particularly in the form of a gutter, to prevent water from entering behind the ventilation grille, and designed to cooperate with a corresponding hook on the ventilation grille, in particular a hook on the blade support. Thus, the blade mounting on the blade support is very advantageously resistant to pull-out.

[0074] The cooperation of the upper hook of the blade with the hook of the blade support makes it possible to prevent the blade from sliding downwards and to provide resistance to pull-out.

[0075] On a blade support according to the invention, a blade can be momentarily loaded with a mass of 100 kg before being pulled away from its blade support. This mass can be increased to 120 kg on anti-pull-out blade supports.

[0076] The upper hook may have a gutter shape, allowing water to be prevented from entering behind the ventilation grille.

[0077] According to the European guidelines of standard EN 13030:2001, a 1 m x 1 m ventilation grille with insect screen and rainwater recovery profile, subject For example, a rain at 75 mm / hour and a headwind of 13 m / s can have an effectiveness in preventing rainwater penetration, defined as the ratio of the volume of water rejected by the grid divided by the volume of water sprayed onto the grid, reaching 99% with an aspiration of 0 m / s, which is a class A categorization, 98.1% with an aspiration of 1 m / s, which is a class B categorization, 87.8% with an aspiration of 2 m / s, which is a class C categorization, and 21.7% with an aspiration of 4 m / s, which is a class D categorization. The resistance to rainwater penetration is thus generally improved.

[0078] The upper hook of the blade is in the shape of a portion of a circle, it does not have a flattened portion.

[0079] At least one blade, or even all the blades of the ventilation grille, may include a lower hook designed to cooperate with a corresponding return of the ventilation grille, in particular a return of the blade support, specifically a return of the blade holder of the blade support. The lower hook prevents the blade embedded in the blade support from being pulled out. The lower hook of the blade is in the shape of a portion of a circle; it does not have a flattened portion.

[0080] The ventilation grille according to the invention improves ventilation flow once installed. It reduces energy losses, optimizes airflow, with reduced pressure losses and noise associated with air passing between the blades, and limits turbulence zones due to the shape of the blades and blade supports, thus reducing vortices behind the blade fixing points which obstruct airflow.

[0081] The width of a blade can be between 21 and 750 mm, or even between 22 and 450 mm, better between 24 and 200 mm, it can be for example around 25 mm.

[0082] The minimum distance between two blades can thus be increased, facilitating the passage of air through the grille. It can be between 16.5 and 450 mm, or even between 17 and 200 mm, preferably between 17.5 and 100 mm, being for example around 17.7 mm.

[0083] The physical free surface area, defined as the ratio between the minimum distance between two blades and the pitch between two blades, can be between 50.5 and 60%, preferably between 51 and 55%, with approximately 52% being the optimal range. This results in a reduction of pressure losses at the grid passage.

[0084] According to the European guidelines of standard EN 13030:2001, for a 1 m x 1 m ventilation grille without insect screen and without rainwater recovery profile, the pressure losses through the grille can be with an airflow velocity of 1 ms-1, of only 9 Pascals (Pa) at the suction side and only 8 Pascals (Pa) at the discharge side, with an airflow velocity of 2 ms-1, of 38 Pascals (Pa) only at the suction and of 31 Pascals (Pa) only at the discharge, with an airflow velocity of 3 ms-1, of 87 Pascals (Pa) only at the suction side and of 72 Pascals (Pa) only at the discharge side, with an airflow velocity of 4 ms-1, of 157 Pascal (Pa) only at the suction and 130 Pascal (Pa) only at the discharge, which is worth a class 3 categorization for the grid in this configuration.

[0085] Furthermore, each blade may have rounded ends, which helps to ensure good resistance to impacts.

[0086] In addition, each blade may include reinforcements at the angular areas, in order to strengthen the blade and limit weak points.

[0087] The specific stiffness of the blade profiles, defined as the ratio of the force applied to the profile divided by the product of the measured deflection and the linear mass of the profile, can, for example, reach a value of 0.39 Nm⁻¹.kg⁻¹ for a standard blade. The deflection of a blade profile, 1.3 m long, spanning 0.3 m with a 1 m overhang, under the effect of a 1 kg force placed at its end, can, for example, be only 160 mm. The second moment of area of ​​the frame parts is improved. For the same ventilation grille size, particularly its length and width, the grille blades are more rigid.

[0088] Installing a blade can be done as follows: in a first step, the top of the blade, in particular the upper hook of the blade, is inserted into the blade holder, in particular into the hook of the blade holder. In a second step, the blade is pressed horizontally so that the blade, in particular the lower hook of the blade, engages with the blade holder, in particular with the blade holder's return. The blade is then permanently fixed and cannot be pulled out. Stiffener

[0089] The ventilation grille may also include a stiffener, configured to support a blade support, in particular as described above. Thus, the ventilation grille may include an additional blade support, in addition to the two blade supports carried by the two frame sections. The stiffener may be arranged vertically.

[0090] In one embodiment, the ventilation grille may include one or more stiffeners arranged vertically at a distance from the vertical frame parts, configured to allow for the support of one or more additional blade supports.

[0091] The stiffener may include two centering ribs between which the blade support can be placed.

[0092] The two centering ribs ensure the correct positioning of the blade support and consequently of the blades.

[0093] The stiffener can be straight. It can be a straight profile. It can have a central groove, which can be partially closed by two ridges, and two lateral grooves which can be used for fixing the mosquito net, for example.

[0094] The stiffener is fully removable and re-mountable, the stiffener does not undergo plastic deformation during the assembly of the grid.

[0095] The stiffener can be pre-positioned by means of machining that can be provided for this purpose in the upper and lower frame sections. The stiffener can be fixed vertically to the upper and lower frame sections by rivets, using a drill and riveting tool. For fixing, two T-pieces can be used, one vertical arm of which can be inserted into a central groove in the stiffener, and the other horizontal upper arm can be attached to the corresponding frame section, in particular by clinching or riveting. Junction

[0096] The ventilation grille may also include a junction, configured to allow two ventilation grilles as described above to be joined together. The junction is configured to receive two vertical or horizontal frame sections.

[0097] The joint can be straight. It can be a straight profile. It can be arranged vertically or horizontally, for example.

[0098] The joint is fully demountable and remountable; the joint does not undergo plastic deformation during grid assembly. The joint can, for example, be bolted to both grids.

[0099] The various parts of the ventilation grille, in particular the frame parts, blades, blade supports, stiffener and / or joint can be made of aluminium or aluminium alloy, for example zamak for the brackets.

[0100] They can be made of extruded profiles, for example of aluminium or aluminium alloy, the ventilation grille being able to be assembled manually in the workshop, from extruded profiles and cut to measure, according to the customer's needs.

[0101] The various parts of the ventilation grille may have an anodized finish, which can advantageously strengthen the surface of the aluminum against corrosion. Alternatively, they may have a raw finish, which can advantageously facilitate the application of a lacquer, improving resistance and aesthetics, or remain as is depending on the exposure of the installation area. Mosquito net

[0102] The ventilation grille may also include a mosquito net. The mosquito net can be attached to the frame. It can be configured to cover all the slats and ventilation openings. It can be attached to the frame by means of a removable gasket inserted into a groove in the frame. The gasket can be compressed into the groove.

[0103] Thus, it can be very easy to assemble, disassemble and reassemble the mosquito net. Securing the mosquito net is facilitated, assembly time is reduced, in addition, any waste of mosquito net fabric can be avoided, as it is cut directly to the correct dimensions, and finishing operations can be minimized.

[0104] The mosquito net can be fixed in one or more grooves in the frame parts. Said groove can be slightly widened for this purpose.

[0105] The mosquito net can be installed as follows: first, the mosquito net fabric is placed on the ventilation grille on the inside of the ventilation duct; second, the mosquito net seal is tucked into the appropriate groove in the frame; and third, the mosquito net fabric is trimmed around the seal, for example, with a utility knife. Thanks to the invention, it is possible to lacquer the seal directly, as its material, for example silicone, is sufficiently temperature-resistant and hard to withstand lacquering and remain permanently installed on the grille. It is not necessary to replace it.

[0106] The mosquito net can be cut from mosquito netting fabric, which can be made of plastic, aluminum, or stainless steel, for example. In one embodiment, a 304 stainless steel mosquito net with a 1.4 x 1.4 mm mesh size is used, designed to block insects.

[0107] A rodent-proof grid can also be added to prevent pests from entering through the building's ventilation openings, in cases where the ventilation grid is used on a building. Installation accessories

[0108] The ventilation grille may also include one or more clip springs to facilitate its installation. The clip spring(s) may or may not be removable.

[0109] Clip springs can be made of spring stainless steel, for example 301 Cl300 stainless steel, in particular by cutting and bending a thin sheet of spring stainless steel. The thickness of the sheet can be less than 4 mm, or even less than 3 mm, preferably less than 2 mm, for example approximately 0.4 mm.

[0110] The flexibility and mechanical strength of the clip springs allow for easy installation and high resistance to frame pull-out. This improves the ergonomics of grid attachment.

[0111] The ventilation grille may also include one or more sealing tabs, which may be non-removable from the outside of the ventilation grille. A sealing tab may, for example, be cut from a thin sheet of stainless steel. The thickness of the sheet may be less than 4 mm, or even less than 3 mm, preferably less than 2 mm, being, for example, approximately 0.4 mm.

[0112] The different types of clip springs and sealing tabs can be attached to the ventilation grille before shipping the grille by means of bolting with a cage nut positioned in one of the external grooves of the frame and screwed reversibly from the outside of the frame by putting pressure on a clip spring or a sealing tab by means of, for example, a screw and a suitable fan washer.

[0113] The invention further relates, independently or in combination with the foregoing, to a ventilation grille, comprising blades providing ventilation passages, the ventilation grille comprising at least one blade support, in particular two blade supports, in particular on either side of the blades, the blade support comprising in particular a plurality of hooks and blade holders, arranged alternately, one hook and one blade holder being configured to receive a blade, the hooks of the blade support each comprising in particular a return configured to cooperate with an upper hook of the corresponding blade.

[0114] The ventilation grille may also include a frame carrying the blades providing ventilation passages, a blade support being fixed on each of two opposite frame parts, in particular by clinching.

[0115] The frame may include assembled frame parts, in particular four assembled frame parts, the frame parts each having in particular at least one groove, in particular two grooves, and being connected in pairs at their ends by a fixing bracket configured to allow the assembly and disassembly of the frame, the fixing bracket being in particular fixed in the grooves of the corresponding frame parts by screwing and optionally by gluing, the glue being intended to be injected between the bracket and the frame parts through a passage in the fixing bracket provided for this purpose.

[0116] The ventilation grille may also include one or more, or even all, of the features mentioned above. Brief description of the drawings

[0117] The invention will be better understood upon reading the detailed description that follows, the non-limiting examples of its implementation, and upon examination of the accompanying drawing, in which:

[0118] [Fig-1] Figure [Fig. 1] illustrates a ventilation grille according to the invention, in front view, with recovery.

[0119] [Fig.2] The [Fig.2] is a partial vertical cross-sectional view of the grid of the [Fig.1].

[0120] [Fig.2a] The [Fig.2a] is a perspective view of the ventilation grille of the [Fig.1].

[0121] [Fig.2b] Fig.2b illustrates a ventilation grille in its entirety with a view isometric rear with a stiffener.

[0122] [Fig. 3] Figure 3 illustrates a variant of the ventilation grille according to the invention, in view of from the front, without overlapping.

[0123] [Fig.4] The [Fig.4] is a partial vertical cross-sectional view of the grid of the [Fig.3].

[0124] [Fig. 5] [Fig. 5] illustrates a variant of the ventilation grille according to the invention, in view of front view, with two grids joined together.

[0125] [Fig.6] The [Fig.6] is a partial horizontal cross-sectional view of the grid of the [Fig.5].

[0126] [Fig.7] Fig.7 illustrates, in cross-section, different profiles for the parts of the frame, the junction, and the rainwater collector for the ventilation grilles shown in Figures 1 to 6. Figure 7(a) illustrates a portion of the frame for the grille shown in Figures 1 and 2. Figure 7(b) illustrates an alternative embodiment of a portion of the frame for the grille shown in Figures 3 and 4. Figure 7(c) illustrates a portion of the frame for the grille shown in Figures 1 and 2. Figure 7(d) illustrates an alternative embodiment of a portion of the frame for the grille shown in Figures 3 and 4. Figure 7(e) illustrates a stiffener for a ventilation grille according to Figures 1 to 6. Figure 7(f) illustrates a junction for a ventilation grille according to Figures 1 to 6. Finally, Figures 7(g), 7(h), and 7(i) illustrate embodiments of rainwater collectors for a ventilation grille according to Figures 1 to 6. 6.

[0127] [Fig.8] Fig.8 illustrates, in cross-section, different profiles for the supports of blades and blades, for the ventilation grilles of figures 1 to 6. Figures 8 (a) and 8 (b) illustrate two variants of the embodiment of a blade support for the ventilation grilles of figures 1 to 6. [Fig.8] (c) illustrates a standard blade, [Fig.8] (d) an upper blade, [Fig.8] (e) a shortened lower blade and finally [Fig.8] (f) an elongated lower blade.

[0128] [Fig.9] Fig.9 illustrates the mounting of a blade on the blade holder in three steps.

[0129] [Fig. 10] The [Fig. 10] is a detail view of blades mounted on the blade support, with two variants of the blade support, namely a standard blade support in (a), and an anti-pull-out blade support in (b).

[0130] [Fig. 11] Fig. 11 is a vertical cross-sectional view of a grid equipped with a mosquito net in (a), with the joint in detail view in (b).

[0131] [Fig.12a] The [Fig.12a] is a cross-sectional view of a frame part equipped with a removable clip spring.

[0132] [Fig. 12b] The [Fig. 12b] is a perspective view of the clip spring of the [Fig. 12a].

[0133] [Fig. 12c] The [Fig. 12c] is a perspective view of the [Fig. 12a].

[0134] [Fig. 12d] The [Fig. 12d] is a cross-sectional view of the frame part of the [Fig. 12a] equipped with its removable spring-clip, mounted on a wall.

[0135] [Fig. 13a] The [Fig. 13a] is a cross-sectional view of a frame part equipped with a spring-clip resistant to disassembly.

[0136] [Fig. 13b] The [Fig. 13b] is a perspective view of the [Fig. 13a].

[0137] [Fig. 13c] The [Fig. 13c] is a cross-sectional view of the frame part of the [Fig. 13a] equipped with its spring-clip resistant to disassembly, mounted on a wall.

[0138] [Fig. 14a] The [Fig. 14a] is a view analogous to figures 12d and 13c of an embodiment variant equipped with a sealing lug.

[0139] [Fig. 14b] The [Fig. 14b] is a view analogous to the [Fig. 14a] of another variant embodiment equipped with a sealing lug. Detailed description

[0140] Figures 1, 2, 2a and 2b illustrate a ventilation grille 1 comprising a frame 10 carrying blades 20 providing ventilation passages 5.

[0141] The ventilation grille 1 according to the invention is intended for a ventilation circuit or a ventilation duct. Alternatively, it can be used without a duct, for example on a cellar or technical room opening, or in cladding.

[0142] The ventilation grille 1 may include a protective portion 12 extending, when the frame 10 is viewed in cross-section, over a length L which may vary. If the ventilation grille 1 is intended to be surface-mounted or overlaid on a wall, the length L may be large, for example, on the order of 22 mm, as illustrated in Figures 1, 2, 7(a), 7(b). If the ventilation grille 1 is intended to be installed in a tunnel, the length L may be small, for example, on the order of 3 mm, as illustrated in Figures 3, 4, 7(c), 7(d).

[0143] As illustrated in Figures 5 and 6, the ventilation grille may also include a junction 30, configured to allow two ventilation grilles 1 to be joined together. The junction is configured to receive two vertical or horizontal frame sections. The junction is a straight profile, which can be bolted to the two grilles.

[0144] The frame 10 comprises four assembled frame parts 11, being connected in pairs at their ends by a fixing bracket 15 configured to allow assembly and disassembly of the frame.

[0145] In the example described, each frame part 11 has two parallel grooves 16, as seen in Figures 7(a) and 7(c). The fixing bracket 15 is fixed in the grooves 16 of the corresponding frame parts 11 by screwing and optionally by gluing, the glue being intended to be injected between the bracket and the frame parts through a passage in the fixing bracket provided for this purpose.

[0146] The fixing bracket 15 has two wings oriented at 90° to each other, as seen in [Fig. 2a], with an angle of 90° between them. Each of the wings is approximately 50 mm long.

[0147] In one embodiment, each frame part 11 has a single groove 16, as illustrated in Figures 7(b) and 7(d).

[0148] The frame sections 11 are each rectilinear, manufactured from straight profiles. The frame section profile is cut at 45° before assembly with the other frame sections 11. The ventilation grille comprises a lower frame section, an upper frame section, and two side frame sections.

[0149] The frame parts 11 each have a portion of a groove 17 in which are provided the groove or grooves 16 intended to receive the fixing bracket 15, and which extends perpendicularly to the protective portion 12 when the frame part 11 is observed in cross-section, as seen in figures 7 (a) to 7 (d).

[0150] In the embodiment illustrated in [Fig. 2a], a single fixing bracket is placed at each corner of the frame, the bracket being positioned in the groove closest to the outside. The grid then comprises four fixing brackets.

[0151] Each frame portion 11 further comprises a fastening portion 19, to which a blade support 40, which will be described below, can be attached. The fastening portion 19 extends perpendicularly to the groove portion 17 and parallel to the protective portion 12 when the frame portion 11 is viewed in cross-section.

[0152] In one embodiment, as illustrated in isolation in [Fig. 2b] without the blades 20, the ventilation grille 1 also includes a vertically arranged stiffener 50, set apart from the vertical frame sections, configured to support a blade support 40 as described below. Thus, the ventilation grille 1 can include an additional blade support 40, in addition to the two blade supports 40 carried by the two vertical frame sections 11.

[0153] The stiffener 50 is formed from a straight profile. As illustrated in [Fig. 7] (e), the stiffener 50 has two centering ribs 51 between which the additional blade support 40 can be placed. It thus has a central groove 52 and two lateral grooves 53 which can be used for attaching the mosquito net, for example, as described later.

[0154] The stiffener 50 is fixed vertically to the upper and lower frame parts 11 by rivets, using a drill and rivet gun. For the fixing, two T-pieces 55, of which a vertical arm can be threaded into the central groove 52 of the stiffener 50, and an upper horizontal arm can be attached to the corresponding frame part 11.

[0155] The ventilation grille 1 also includes two blade supports 40, on either side of the blades 20. They are each straight, made from straight profiles. A blade support 40 is fixed to each of two opposing frame sections 11, at the fixing portion 19 of the corresponding frame section 11.

[0156] As illustrated in figures 8 (a) and 8 (b), the blade support 40 comprises a plurality of hooks 41 and blade holders 42, arranged alternately, one hook 41 and one blade holder 42 being configured to receive a blade 20.

[0157] A blade 20 is received in the blade holder 40 by being inserted under the hook 41 and clicked into the blade holder 42, as illustrated in [Fig. 9]. Inserting the blade involves a first step of inserting the top of the blade 20 under the hook, then a second step of clicking a hook 21 of the blade into a return located at the end of the corresponding blade holder 42. Each blade cooperates with a hook 41 and a blade holder 42 located just below the hook, as shown in Figures 2 and 4.

[0158] The hook and the blade holder intended to receive the same blade are separated by a distance d of approximately 27.4 mm. The blade holder and the hook intended to receive two consecutive blades are separated by a distance a of approximately 6.6 mm.

[0159] The blade support in the described example carries 6 blades, comprising 6 hooks 41 and 6 blade holders 42.

[0160] The hooks 41 of the blade support may each have a return configured to cooperate with an upper hook 22 of the corresponding blade 20. The hook 41 of the blade support 40 may have a comma-shaped rounded form adapted to receive and retain the top of the blade profiles, in a gutter-like shape, preventing water from entering behind the ventilation grille 1 and preventing the blade from being pulled off, as illustrated in the embodiment of Figures 8(b) and 10(b). Alternatively, it may be gutter-shaped but without a return, as in the embodiment of Figures 8(a) and 10(a).

[0161] A hook 41 and a blade holder 42 intended to receive two consecutive blades 20 are separated by a cutting point 45 allowing the blade support 40 to be cut to the appropriate length for manufacturing the grid 1. The cutting point 45 allows an easy, clean and precise cutting of the blade support, at a precise point located between a hook 41 and the next blade holder 42, at the base of the blade holder 42. The cutting point 45 is defined by a narrowing of the blade support.

[0162] As illustrated in [Fig. 10], the distance bl between the cutting point and the nearest hook is approximately 5.4 mm. The distance b2 between the cutting point and the nearest blade holder is approximately 1.2 mm. It is close to 0.

[0163] Whether on a given blade support or at the junction of two successive blade supports, the distance between a blade holder and the next hook of a blade support can be small, with a difference of less than 4 mm, or even less than 3 mm, better less than 2 mm, being for example on the order of 0.4 mm.

[0164] The ventilation grille comprises a plurality of blades, in particular so-called standard blades which make up the bulk of the plurality of blades, as illustrated in [Fig.8] (c). These blades are each straight, made from straight profiles.

[0165] The ventilation grille 1 also includes an upper blade, illustrated in [Fig. 8] (d), which is the blade intended to be positioned above the other blades, along the horizontally positioned portion of the frame at the top of the ventilation grille. The upper blade includes an extension portion 26 of the upper hook, which allows it to be brought closer to the frame 10. The extension portion 26 extends upwards the protection provided by the blades 20, particularly against rain or other inclement weather, and minimizes the airflow above the upper blade. The gap between the upper blade 20 and the frame 10 is thus minimized, resulting in a more aesthetically pleasing finish.

[0166] The ventilation grille 1 also includes a lower blade, which is the blade intended to be arranged below the other blades, along a portion of the frame placed horizontally at the bottom of the ventilation grille.

[0167] Depending on the frame height, the lower blade can be adapted with varying lengths. It can be elongated, standard, or shortened, comprising a lower vertical portion 25 extending more or less. The vertical portion extends vertically when the lower blade is viewed in a plane transverse to it. The vertical portion can thus be flush with the horizontally positioned portion of the frame at the bottom of the ventilation grille, regardless of the frame height. This can, for example, advantageously protect the ventilation grille from rain or other weather conditions and minimize airflow below the lower blade, giving the grille an aesthetically pleasing finish. The space between the lower blade and the frame is thus minimized. In the embodiment of [Fig. 8] (f), the vertical portion 25 is elongated. Alternatively, the lower blade can be shortened, as illustrated in [Fig. 8] (f).8] (e), then being devoid of such a vertical portion. .

[0168] As explained above, all the blades 20 of the ventilation grille 1 have an upper hook 22 intended to cooperate with a corresponding hook 41 of the blade support. Similarly, all the blades 20 of the ventilation grille 1 have a lower hook 21 intended to cooperate with a corresponding return of the blade holder 42 of the blade support 40.

[0169] The width of a blade can be between 21 and 750 mm, or even between 22 and 450 mm, better between 24 and 200 mm, it can be for example around 25 mm.

[0170] The minimum distance between two blades can thus be increased, facilitating the passage of air through the grille. It can be between 16.5 and 450 mm, or even between 17 and 200 mm, preferably between 17.5 and 100 mm, being for example around 17.7 mm.

[0171] The physical free area, defined as the ratio between the minimum distance between two blades and the pitch between two blades, can be approximately 52%. This results in a reduction of pressure losses at the grid passage. According to the European guidelines of standard EN 13030:2001, for a 1 m x 1 m ventilation grille without mosquito netting and without rainwater recovery profile, the pressure losses through the grille can be, with an air flow velocity of 1 ms-1, 9 Pascal (Pa) only at the intake and 8 Pascal (Pa) only at the discharge, with an air flow velocity of 2 ms-1, 38 Pascal (Pa) only at the intake and 31 Pascal (Pa) only at the discharge, with an air flow velocity of 3 ms-1, 87 Pascal (Pa) only at the intake and 72 Pascal (Pa) only at the discharge, with an air flow velocity of 4 m.s-1, of 157 Pascals (Pa) only at the aspiration and of 130 Pascals (Pa) only at the discharge, which is worth a class 3 categorization for the grid in this configuration.

[0172] Furthermore, each blade 20 has rounded ends, which ensures good resistance to impacts.

[0173] The ventilation grille 1 also includes a rain collector 60, which can be made from a single profile, being one piece, as illustrated in [Fig.8] (g), or made from several profiles and sheet metal parts, for example four, as illustrated in [Fig.8] (h).

[0174] The ventilation grille may also include a mosquito net 70, as illustrated in [Fig. 11]. The mosquito net 70 is attached to the frame 10. It is configured to cover all the blades 20 and the ventilation openings 5. In this embodiment, it is attached to the frame 10 by means of a removable gasket 72 inserted into a groove 74 in the frame 10. The gasket 72 is compressed in the groove.

[0175] The mosquito net can be installed as follows: first, the mosquito net fabric 70 is placed on the ventilation grille 1 on the inside of the ventilation duct; second, the mosquito net seal 72 is stuffed into the appropriate groove 74 in the frame; and third, the mosquito net fabric 70 is trimmed around the seal 72.

[0176] The ventilation grille also includes one or more clip springs 80 to facilitate its installation in the ventilation duct. The clip spring(s) 80 may or may not be removable.

[0177] By way of example, figures 12a to 12d illustrate a grid 1 comprising a removable clip-spring 80.

[0178] Figures 13a to 13c illustrate a grid 1 comprising a spring-clip 80 resistant to disassembly.

[0179] The clip springs can be made of spring stainless steel, for example 301 Cl300 stainless steel, notably by cutting and bending a thin sheet of spring stainless steel. The sheet thickness can be less than 4 mm, or even less than 3 mm, preferably less than 2 mm, for example, approximately 0.4 mm. The flexibility and mechanical strength of the clip springs allow for easy installation and high resistance to frame pull-out. The ergonomics of the grille attachment are thus improved.

[0180] The ventilation grille may also include one or more sealing tabs 85, which may be non-removable from outside the ventilation grille. A sealing tab may, for example, be cut from a thin sheet of stainless steel; the thickness of the sheet may be less than 4 mm, or even less than 3 mm, preferably less than 2 mm, being, for example, approximately 0.4 mm. By way of example, Figures 14a and 14b illustrate an alternative embodiment equipped with a sealing tab 85, which is mounted either on a wall M at a 90° angle or on a flat wall M.

[0181] The various types of clip springs and sealing tabs can be attached to the ventilation grille before shipment of the grille by means of bolting with a cage nut positioned in one of the external grooves of the frame and screwed reversibly from the outside of the frame by putting pressure on a clip spring or a sealing tab by means of, for example, a screw and a suitable fan washer.

Claims

Demands

1. Ventilation grille (1), comprising a frame (10) carrying blades (20) providing ventilation passages (5), the frame (10) comprising assembled frame parts (11), in particular four assembled frame parts (11), a blade support (40) being fixed to each of two opposing frame parts (11) by clinching, in particular being devoid of rivets.

2. Ventilation grille according to the preceding claim, the frame parts (11) each having at least one groove (16), in particular two grooves (16), and being connected in pairs at their ends by a fixing bracket (15) configured to allow the mounting and dismounting of the frame (10).

3. Ventilation grille according to the preceding claim, the fixing bracket (15) being fixed in the grooves (16) of the corresponding frame parts (11) by screwing and optionally by gluing, the glue being intended to be injected between the bracket and the frame parts through a passage in the fixing bracket provided for this purpose.

4. Ventilation grille according to the preceding claim, a frame part (11) having two parallel grooves (16), two consecutive frame parts being connected to each other by two fixing brackets (15) fixed parallel to each other.

5. Ventilation grille according to any one of the preceding claims, the blade support (40) comprising a plurality of hooks (41) and blade holders (42), arranged alternately, one hook (41) and one blade holder (42) being configured to receive a blade (20).

6. Ventilation grille according to the preceding claim, the hooks (41) of the blade support (40) each having a return configured to cooperate with an upper hook (22) of the corresponding blade (20).

7. Ventilation grille according to one of the two preceding claims, a hook (41) and a blade holder (42) intended to receive two consecutive blades (20) being separated by a cutting point (45) allowing the cutting of the blade support (40).

8. Ventilation grille according to one of the three preceding claims, the distance between a blade holder (42) and the subsequent hook (41) of a blade support (40) being substantially always the same.

9. Ventilation grille according to any one of the preceding claims, at least one blade (20), or even all of the blades (20) of the ventilation grille, comprising an upper hook (22) intended to cooperate with a corresponding hook (41) of the ventilation grille, in particular a hook of the blade support.

10. Ventilation grille according to any one of the preceding claims, at least one blade (20), or even all of the blades (20) of the ventilation grille, comprising a lower hook (21) intended to cooperate with a corresponding return of the ventilation grille, in particular a return of the blade support (40), in particular a return of the blade holder (42) of the blade support (40).

11. Ventilation grille according to any one of the preceding claims, the width of a blade being between 21 and 750 mm, or even between 22 and 450 mm, better between 24 and 200 mm, being for example in the order of 25 mm.

12. Ventilation grille according to any one of the preceding claims, the minimum distance between two blades being between 16.5 and 450 mm, or even between 17 and 200 mm, better between 17.5 and 100 mm, being for example around 17.7 mm.

13. Ventilation grille according to any one of the preceding claims, the physical free area indicated as the ratio between the minimum distance between two blades and the pitch between two blades being between 50.5 and 60%, better between 51 and 55%, in particular being about 52%.

14. Ventilation grille according to any one of the preceding claims, comprising a stiffener (30) arranged vertically at a distance from the vertical frame parts (11), configured to allow for the support of an additional blade support (40).

15. Ventilation grille according to the preceding claim, the stiffener (30) having two centering ribs (51) between which the blade support (40) can be placed.

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