Attachment device for apparatus particularly such as a smoke and / or gas detector and such an appliance including said device

Abstract

The present invention relates to a fixing device for an apparatus more particularly of the smoke and / or gas detector type, said fixing device comprising a fixing base (1) comprising a fixing wall (12) having two opposite faces (10, 11), namely an external face (10) turned, in the fixing state of the base (1) towards said support (S) and an internal face (11) turned towards said housing (2) in the fixing state of the latter on the base (1).It further comprises, on the one hand, a fastening element (3) for fixing said base (1) to the support (S) at a single point of fixation by mechanical pressure, said base (1) comprising a through hole (13) passing through said fixing wall (12) to allow the passage of the fastening element (3) and its fixation in the support (S), and, on the other hand, anti-rotation means (4) suitable and intended, when said base (1) is fixed to the support (S) by said fastening element (3), to prevent rotation of the base (1) around the axis (X) of said hole (13). It also relates to a device, more particularly of the smoke and / or gas detector type, comprising said device.

Description

[0001] The present invention relates to the field of security elements in buildings or structures and in particular autonomous detectors and alarms and relates to a fixing device for a device, more particularly of the smoke and / or gas detector type, and such a device comprising said device.

[0002] Stand-alone detectors and alarms, more specifically those intended for the detection of smoke and / or gas, commonly called smoke and / or gas detectors, are devices which detect smoke, gas or vapor particles in the air and, in response, emit an alarm such as an audible signal.

[0003] These detectors are generally positioned high up, being fixed to supports such as the ceiling of a house or the upper part of a vertical wall.

[0004] These detectors comprise, on the one hand, a detection box containing a system ensuring the detection and alarm functions and, on the other hand, a fixing base intended to be fixed on the support, generally using several screws and / or assembly dowels ensuring their connection with the support concerned. The detection box is secured to the base by various means such as clips or mounting groove systems. This type of mounting allows the installer to fix only the base on the support, which can be fixed first on the support, then the box on the base in a second step, which facilitates the fixing of the detector on the support. In addition, maintenance is greatly facilitated by the fact that the active part of the detector, i.e. the detection box, can easily be detached from the base.

[0005] Generally, the fixing means, such as mounting groove systems, allowing the fixing of the detection box on the base, require a relative rotation of the detection box with respect to its base. It follows that the base, fixed on the support, must not have any degree of freedom in rotation. To allow such mounting, the base is generally fixed on the support by means of two screws.

[0006] However, this solution is expensive in terms of assembly time and the number of screws and dowels, and is not optimal. In addition, in the case of a concrete ceiling, several holes, usually two, must be drilled before fixing the base to the ceiling. In addition, if the ceiling is of a different nature, for example plaster, the base fixing system must be adapted to the support and include specific fixing elements such as dowels for plaster or plasterboard.

[0007] Document US 2016 / 345447 relates to a surface mounting system. The system comprises a plate for mounting on a surface such as a wall or ceiling having a plurality of mounting holes allowing the passage of screws or nails through the body of the plate for attachment to the surface and a detection housing removably attachable to the mounting plate by being rotated to a desired orientation.

[0008] Document DE202015103486 relates to a housing for receiving a smoke / fire detector and for being fixed to a base which is fixed, for example, to the ceiling of a room. The housing comprises a main part for receiving said detector and a fixing device comprising a base and a fixing part for fixing the fixing device to the base.

[0009] US 10,041,919 relates to a bracket for mounting one or more radon detectors on a flat surface such as a wall or ceiling. It comprises a housing containing the radon detector and a flat plate removably coupleable to the housing. The flat plate is provided with a plurality of trous de vis to allow it to be permanently fixed to the flat surface.

[0010] These three documents have the aforementioned cost / assembly time disadvantages.

[0011] Document FR 3 022 970 A1 relates to a support part for supporting a smoke detector, comprising a base provided with a means for fixing the smoke detector, a central opening surrounded by flexible parts for absorbing a shock applied to a nail passing through the central opening to nail the support part to a wall and a washer for distributing the force applied by the head of the nail on said flexible parts. However, such a support part fixed to the wall by a single nail in its center does not prevent, or effectively prevent, a relative rotational movement between the base and the support.The present invention aims to overcome these drawbacks by proposing a fixing device, more particularly for a device of the smoke and / or gas detector type, making it possible to optimize the time taken to mount the device on any type of support and to reduce the cost, while preventing, or more effectively preventing, the relative rotational movement between the fixing base and such a support.

[0012] For this purpose, the fixing device, according to the present invention, for an apparatus more particularly of the smoke and / or gas detector type, said fixing device comprising a fixing base allowing the fixing of a housing of said apparatus on a support and being capable of being assembled to said housing, said base comprising a fixing wall having two opposite faces, namely an external face turned, in the state of fixing of the base, towards said support and an internal face turned towards said housing in the state of fixing of the latter on the base, said fixing device further comprising, on the one hand, a fixing element allowing said base to be fixed to the support at a single fixing point by mechanical pressure, said base comprising a passage hole, passing through said fixing wall, to allow the passage of the fixing element and its fixing in the support and, on the other hand, suitable and intended anti-rotation means,in the fixed state of said base to the support by said fixing element, to prevent a rotational movement of the base around the axis of said hole by a mechanical interaction effect between at least a part of said anti-rotation means and the support opposing said relative rotational movement between the base and the support, characterized in that the anti-rotation means consist of an anti-rotation plate, preferably a metal anti-rotation plate, applied and held on the internal face or the external face of the base and comprising at least one anti-rotation mechanical interaction element, for example in the form of a claw, point or lug, extending functionally on the side of the external face of the anti-rotation plate, said anti-rotation plate comprising a through-passage opening located opposite the passage hole to allow the passage of the fixing element through said anti-rotation plate,the or each anti-rotation mechanical interaction element being capable, when fixing the base to the support and under the effect of pressure exerted by the fixing element directly or indirectly on the anti-rotation plate, of coming into pressure against the support so as to be able to be inserted or sunk or anchored in said support or to be in point contact with anti-rotation friction with said support.,

[0013] The present invention also relates to an apparatus more particularly of the smoke and / or gas detector type, said apparatus comprising a housing and a fixing device, said fixing device comprising a base allowing the fixing of the housing on a support and being assembled to said housing, said base comprising a fixing wall having two opposite faces, namely an external face facing said support in the state of fixing on said support and an internal face facing said housing, characterized essentially in that said fixing device consists of a fixing device according to the present invention.

[0014] The invention will be better understood from the following description, which relates to a preferred embodiment, given as a non-limiting example, and explained with reference to the appended schematic drawings, in which: [ Fig. 1 ] is a perspective view of the fixing device according to the present invention, on the external face side of the fixing wall of the base, in a first embodiment where the anti-rotation plate, comprising two anti-rotation mechanical interaction elements, is located on said external face and in an embodiment of the device comprising an assembly pin integrated into the base on the side of said external face, [ Fig. 2 ] is a partial view of the fixing device shown in the figure 1 in an opposite orientation, internal face side, with a screw-shaped fixing element, [ Fig. 3 ] is a perspective view of the anti-rotation plate showing its face where the two anti-rotation mechanical interaction elements extend, [ Fig. 4 ] shows the anti-rotation plate shown on the figure 3 in an opposite orientation, on the side of the face opposite to that where the two anti-rotation mechanical interaction elements extend, [ Fig. 5 ] shows the device shown in the figure 1 according to a plan view of the internal face side, without the fixing element, [ Fig. 6 ] shows the device shown in the figure 5 in an opposite orientation, external face side, [ Fig. 7 ] is a perspective view of the fixing device according to the present invention, on the external face side of the fixing wall of the base, in a second embodiment where the anti-rotation plate, comprising two anti-rotation mechanical interaction elements, is located on the internal face opposite said external face, in an embodiment comprising an assembly pin integrated into the base 1 on the external face side, [ Fig. 8 ] is a partial view of the fixing device shown in the figure 7 in an opposite orientation, on the internal face side on which the anti-rotation plate is located, with a screw-type fixing element, [ Fig. 9 ] shows the device shown in the figure 7 according to a plan view from the external face side, without the fixing element inserted into the assembly pin, [ Fig. 10 ] shows the device shown in the figure 7 according to a plan view of the internal face side, without the fixing element, [ Fig. 11 ] shows a cross-sectional view of the device shown in the figure 7 , in the state of fixing on a support of the type made from a material such as plaster, with the two anti-rotation mechanical interaction elements driven into said support and the assembly dowel making it possible to securely fix the screw-type fixing element in said support, [ Fig. 12 ] shows a cross-sectional view of an apparatus of the smoke and / or gas detector type, said apparatus comprising the device shown in the figure 7 , in the state of fixing on a support of the concrete type with the two anti-rotation mechanical interaction elements coming into point contact with anti-rotation friction with said support S.

[0015] The attached figures show a fixing device, according to the present invention, for an apparatus more particularly of the smoke and / or gas detector type, said fixing device comprising a fixing base 1 allowing the fixing of a casing of said apparatus on a support S and being capable of being assembled to said casing 2, said base 1 comprising a fixing wall 12 having two opposite faces 10, 11, namely an external face 10 facing, in the fixing state of the base 1, towards said support S and an internal face 11 facing towards said casing 2 in the fixing state of the latter on the base 1.

[0016] According to the present invention, such a device further comprises, on the one hand, a fixing element 3 making it possible to fix said base 1 to the support S at a single fixing point by mechanical pressure, said base 1 comprising a passage hole 13, preferably a single passage hole 13, passing through said fixing wall 12, to allow the passage of the fixing element 3 and its fixing in the support S and, on the other hand, anti-rotation means 4 capable and intended, in the fixed state of said base 1 to the support S by said fixing element 3, to prevent a rotational movement of the base 1 around the axis X of said hole 13 by a mechanical interaction effect between at least one part 40, 41 of said anti-rotation means 4 and the support S opposing said relative rotational movement between the base 1 and the support S.

[0017] The S bracket can be of the wall, ceiling or partition type, for fixing, for example, in a building or edifice.

[0018] Preferably, as can be seen on the figures 2 , 5 , 10 , 11 And 12 , the passage hole 13 is made in the center or substantially in the center of the wall 12 for fixing the base 1.

[0019] Preferably, as can also be seen more particularly on the figures 1, 2 , 5 , 6, 7 , 8 , 9 , 11 And 12such a fixing device may further comprise, optionally, a mechanical assembly pin 5 capable of receiving the fixing element 3 to securely fix the latter in the support S by mechanical deformation of said pin 5 under the effect of the insertion of the fixing element 3 in the latter. The pin 5 is, preferably, integrated in the fixing wall 12 of the base 1 by axially extending the passage hole 13 on the side of the external face 10, that is to say normally to the plane of said external face 10.

[0020] Such a dowel 5 can thus extend on the side of the base 1, that is to say on the side of its external face 10, intended to be pressed against or applied against a support S. On the other hand, the integration of the dowel 5 in the base 1, that is to say the fact that the latter are made in a single piece, allows the installer not to have to have an additional dowel. One solution could be the sale of the base 1 with a dowel, but the latter could be lost by the user. The dowel 5 integrated in the base 1 according to the present invention avoids this problem of loss because it is always integral with the base 1. Finally, the dowel integrated in the base 1 also plays an anti-rotation role, which would not be the case for two separate parts not fixed together, that is to say in the case where the dowel is not integrated in the base 1 but added.

[0021] If we refer to the attached figures and more particularly to the figures 3 et 4 , it can be seen that the anti-rotation means 4 consist of an anti-rotation plate 4, preferably metallic, applied and held either, in a first embodiment, on the external face 10 of the base 1 ( figures 1, 2 , 5 And 6 ) or, in a second embodiment, on the internal face 11 of the base 1 ( figures 7 , 8 , 9, 10 , 11 And 12 ).

[0022] The anti-rotation plate 4 comprises at least one anti-rotation mechanical interaction element 40, 41, for example in the form of a claw, point or lug, extending functionally on the side of the external face 10 of the anti-rotation plate 4. Furthermore, it can be seen that the anti-rotation plate 4 comprises a through-passage opening 42 located opposite the passage hole 13. The opening 42 allows the passage of the fixing element 3 through said anti-rotation plate 4.

[0023] The anti-rotation plate 4 can be applied and held in the external face 10 or internal face 11 of the fixing wall 12 of the base 1 by being housed and held in a housing 18 made, preferably centrally, in said external face 10 or external face 11. The housing 18 can comprise retaining means allowing for example the introduction of the anti-rotation plate 4 into said housing 18 by elastic fitting.

[0024] The or each anti-rotation mechanical interaction element 40, 41 is capable, when fixing the base 1 on the support S and under the effect of pressure exerted by the fixing element 3 directly or indirectly on the anti-rotation plate 4, of coming into pressure against the support S so as to be able to be inserted or driven in or anchored in said support S ( figure 11 ) or to be in point contact with anti-rotation friction with said support S ( figure 12 ).

[0025] In the second embodiment where the anti-rotation plate 4 is applied and held on the internal face 11 of the base 1, the fixing wall 12 of the base 1 comprises at least one through-passage orifice 14, 15 allowing the passage of the anti-rotation mechanical interaction element 40, 41 through said orifice 14, 15 emerging from the external face 10 in order to be able, when fixing the base 1 on the support 1 and under the effect of pressure exerted by the fixing element 3 directly on the anti-rotation plate 4, to come into pressure against the support S so as to be able to insert or sink or anchor itself in said support S ( figure 11 ) or to be in point contact with anti-rotation friction with said support S ( figure 12 ).

[0026] In a preferred embodiment, the fixing element 3, which may for example be a screw, comprises a head 30, of the screw head type, capable of coming, when fixing the base 1 on the support S, either, in the case where the anti-rotation plate 4 is applied to the internal face 11 of the base 1 ( figures 7 , 8 , 9, 10 , 11 And 12 ), in contact with the anti-rotation plate 4 to exert pressure directly on the latter, or, in the case where the anti-rotation plate 4 is mounted on the external face 10 of the base 1, in contact with the internal face 11 of the base 1 to provide pressure indirectly on the anti-rotation plate 4 ( figures 1, 2 , 5 And 6 ).

[0027] In a preferred form of the anti-rotation plate 4, the latter may comprise a central part 43 and at least one part and at least one elastically deformable and / or flexible and / or supple connecting part 44, 45, which may form a spring zone, connecting the or each anti-rotation mechanical interaction element 40, 41 to said central part 43 (see more particularly the figures 1, 2 , 3, 4 , 5 , 6 , 8 , 10 , 11 And 12 ) and arranged in such a way that, when fixing the base 1 on the support S ( figures 11 And 12 ), the fixing element 3, where appropriate its head 30, exerts pressure, directly or indirectly, on the central part 43. It will be understood that the or each connecting part 44, 45 may have greater flexibility and / or suppleness and / or elasticity than the central part 43.

[0028] In the case of the second embodiment where the anti-rotation plate 4 is applied and held on the external face 10 of the base 1 ( figures 1, 2 , 5 And 6 ), said base 1 may further comprise at least one receiving cavity 16, 17 made in the external face 10 of the base 1 to receive the or one of the elastically deformable parts 44, 45 during its deformation due to the resistance to penetration opposed by a support S. in particular during fixing in a support S of the concrete type ( figure 12 ). Preferably, the elastically deformable part 44, 45 carries, preferably at its free end opposite that connecting it to the central part 43, the or one of the fixing elements 3.

[0029] Thus, for example, in the case of a plaster-type support S, for example a plasterboard, that is to say a support S made from a soft or relatively soft material or having a low hardness offering low resistance to penetration of the fixing element 3, as can be seen in the figure 11 , the pressure exerted by the fixing element 3, such as a screw, directly or indirectly on the anti-rotation plate 4, allows or each anti-rotation mechanical interaction element 40, 41 to penetrate or sink or anchor itself in such a support S.

[0030] If the support S is made from a harder material than plaster, for example a concrete support S offering high resistance to penetration of the fixing element 3, as can be seen in the figure 12 , the or each anti-rotation mechanical interaction element 40, 41 cannot penetrate or sink into the support S under the pressure of the fixing element 3, such as a screw, exerted, directly or indirectly, on the anti-rotation plate 4. In such a case, in order to make the anti-rotation plate 4 functional, the latter may be provided with a spring zone. The spring zone may be arranged in the anti-rotation plate 4 in such a way that the fixing element 3 such as a screw does not press on this spring zone, otherwise it could no longer be functional. The or each spring zone may be formed by the elastically deformable portion 44, 45 connecting the or each anti-rotation mechanical interaction element 40, 41 to the central portion 43 of the anti-rotation plate 4.Thus, when assembling the base 1 on a hard support S of the concrete type, the pressure of the fixing element 3 is transmitted to the or each anti-rotation mechanical interaction element 40, 41 which, being unable to penetrate or sink or anchor itself in the concrete, causes a bending of the spring zone 44, 45, avoiding deterioration, for example in the form of crushing, of the or each anti-rotation mechanical interaction element 40, 41 while allowing this or these latter to come into punctual contact with anti-rotation friction with said support S to achieve the anti-rotation function of the present invention.

[0031] Thus the pressure of the fixing element 3 is transmitted to the or each anti-rotation mechanical interaction element 40, 41 and the anti-rotation function of the anti-rotation plate 4 is ensured whatever the nature of the support S because the pressure of the or each anti-rotation mechanical interaction element 40, 41 on the support S is sufficient to prevent rotation of the base 1 around its axis X once the anti-rotation mechanical interaction element(s) 40, 41 are inserted, anchored or driven into the support S, where appropriate via the dowel 5 ( figure 11 ) or when the anti-rotation mechanical interaction element(s) 40, 41 come under pressure with anti-rotation friction on the support S ( figure 12 ).

[0032] The present invention also relates to an apparatus more particularly of the smoke and / or gas detector type, said apparatus comprising a housing 2 ( figure 12) and a fixing device, said fixing device comprising a base 1 allowing the fixing of the housing 2 on a support S and being assembled to said housing 2, said base 1 comprising a fixing wall 12 having two opposite faces 10, 11, namely an external face 10 facing said support S in the state of fixing on said support S and an internal face 11 facing said housing 2.

[0033] According to the present invention, in such an apparatus, said fixing device consists of a fixing device according to the present invention.

[0034] Of course, the invention is not limited to the embodiments described and shown in the attached drawings. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of the invention as defined by the following claims.

Claims

1. Fastening device for an apparatus, more particularly of the smoke and / or gas detector type, said fastening device comprising a fastening baseplate (1) allowing the fastening of a casing of said apparatus onto a support (S) and being able to be joined to said casing (2), said baseplate (1) comprising a fastening wall (12) having two opposite faces (10, 11), namely an external face (10) turned, in the state in which the baseplate (1) is fastened, towards said support (S) and an internal face (11) turned towards said casing (2) in the state in which the latter is fastened onto the baseplate (1), said fastening device further comprising, on the one hand, a fastening element (3) making it possible to fasten said baseplate (1) to the support (S) at a single fastening point by mechanical pressure, said baseplate (1) comprising a passage hole (13), passing through said fastening wall (12), forr allowing the passage of the fastening element (3) and its fastening in the support (S) and, on the other hand, anti-rotation means (4) that are able and intended, in the state in which said baseplate (1) is fastened to the support (S) by said fastening element (3), to prevent a rotational movement of the baseplate (1) about the axis (X) of said hole (13) by an effect of mechanical interaction between at least one part (40, 41) of said anti-rotation means (4) and the support (S) opposing said relative rotational movement between the baseplate (1) and the support (S), characterized in that the anti-rotation means (4) consist of an anti-rotation plate (4), preferably a metal anti-rotation plate, applied and held on the internal face (11) or the external face (10) of the baseplate (1) and comprising at least one anti-rotation mechanical interaction element (40, 41), for example in the form of a claw, a point or a lug, extending functionally on the side of the external face (10) of the anti-rotation plate (4), said anti-rotation plate (4) having a passage through-opening (42) situated facing the passage hole (13) for allowing the passage of the fastening element (3) through said anti-rotation plate (4), the or each anti-rotation mechanical interaction element (40, 41) being able, during the fastening of the baseplate (1) onto the support (S) and under the effect of a pressure exerted by the fastening element (3) directly or indirectly on the anti-rotation plate (4), to come to press against the support (S) so as to be able to be inserted or pushed or anchored in said support (S) or to be in point contact with said support (S) with anti-rotation friction.

2. Fastening device according to Claim 1, characterized in that the passage hole (13) is made in the centre or substantially in the centre of the fastening wall (12) of the baseplate (1).

3. Fastening device according to Claim 1 or Claim 2, characterized in that it further comprises a mechanical joining plug (5) that is able to receive the fastening element (3) so as to fasten the latter firmly in the support (S) by mechanical deformation of said plug (5) under the effect of the insertion of the fastening element (3) in the latter, and in that said plug (5) is integrated in the fastening wall (12) of the baseplate (1) by axially extending the passage hole (13) on the side of the external face (10).

4. Fastening device according to any one of Claims 1 to 3, characterized in that the anti-rotation plate (4) is applied and held on the internal face (11) of the baseplate (1), and in that the fastening wall (12) of the baseplate (1) comprises at least one passage through-orifice (14, 15) allowing the passage of the anti-rotation mechanical interaction element (40, 41) (40, 41) through said orifice (14, 15), emerging from the external face (10) of the baseplate (1) so as to be able, during the fastening of the baseplate (1) onto the support (S) and under the effect of a pressure exerted by the fastening element (3) directly on the anti-rotation plate (4), to come to press against the support (S) so as to penetrate or be pushed, inserted or anchored in said support (S) or to be in point contact with said support (S) with anti-rotation friction.

5. Fastening device according to any one of Claims 1 to 4, characterized in that the or each fastening element (3) comprises a head (30), of the screw head type, which is able to come, during the fastening of the baseplate (1) onto the support (S), either, in the case in which the anti-rotation plate (4) is applied on the internal face (11) of the baseplate (1), into contact with the anti-rotation plate (4) so as to exert the pressure directly on the latter, or, in the case in which the anti-rotation plate (4) is mounted on the external face (10) of the baseplate (1), into contact with the internal face (11) of the fastening wall (12) of the baseplate (1) so as to provide the pressure indirectly on the anti-rotation plate (4).

6. Fastening device according to any one of Claims 1 to 5, characterized in that the anti-rotation plate (4) comprises a central part (43) and at least one elastically deformable and / or flexible connecting part (44, 45), which is able to form a spring zone, connecting the or each anti-rotation mechanical interaction element (40, 41) (40, 41) to said central part (43) and disposed in such a way that, during the fastening of the baseplate (1) onto the support (S), the fastening element (3), if appropriate its head (30), exerts the pressure on the central part (43), and in that, in the case in which the anti-rotation plate (4) is applied and held on the external face (10) of the baseplate (1), said baseplate (1) further comprises at least one receiving cavity (16, 17) made in the external face of the baseplate (1) for receiving at least the or one of the connecting parts (44, 45) during its deformation as a result of the resistance provided by a support (S) against the pushing-in.

7. Fastening device according to any one of Claims 1 to 6, characterized in that the passage opening (42) of the anti-rotation plate (4) is made in the centre of the latter.

8. Fastening device according to Claim 7, characterized in that the anti-rotation mechanical interaction elements (40, 41) are positioned symmetrically with respect to the passage opening (42).

9. Fastening device according to any one of Claims 1 to 8, characterized in that the baseplate is made from a plastics material.

10. Fastening device according to any one of Claims 1 to 9, characterized in that the baseplate (1) has a circular or disc-like overall shape.

11. Apparatus, more particularly of the smoke and / or gas detector type, said apparatus comprising a casing (2) and a fastening device, said fastening device comprising a baseplate (1) allowing the fastening of the casing (2) onto a support (S) and being joined to said casing (2), said baseplate (1) comprising a fastening wall (12) having two opposite faces (10, 11), namely an external face (10) turned towards said support (S) in the state in which it is fastened onto said support (S) and an internal face (11) turned towards said casing (2), characterized in that said fastening device consists of a fastening device according to any one of Claims 1 to 10.

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