WO2021122050A1

WO2021122050A1 - Sealed cable gland, electrical housing comprising such a cable gland and electrical appliance comprising an appliance mechanism mounted in such an electrical housing

Info

Publication number: WO2021122050A1
Application number: PCT/EP2020/084599
Authority: WO
Inventors: Frédéric Malischewski; Eric Dumas; Alain Baudou; Laurent Janicot
Original assignee: Legrand France; Legrand Snc
Priority date: 2019-12-20
Filing date: 2020-12-04
Publication date: 2021-06-24
Also published as: EP4078746A1; FR3105623A1; FR3105623B1; CN114830476B; CN114830476A

Abstract

The invention relates to a cable gland (300) for an electrical housing, comprising: - a support plate (310) which is made of a rigid material and has a substantially planar face (311) and comprises at least one opening (315) for receiving the cable, and - a seal (320) made of a flexible material which extends around the opening to provide a seal between the support plate and the rest of the electrical housing (10). According to the invention, the seal comprises a main portion which has a closed contour and which extends fully over the substantially planar face.

Description

Title of the invention: Waterproof cable gland, electrical box comprising such a cable gland and electrical equipment comprising an equipment mechanism attached to such an electrical box

The present invention relates generally to the field of electrical equipment (typically electrical outlet or switch mechanisms).

It relates more particularly to watertight electrical boxes to be protruding from wall walls, and electrical equipment provided with such an electrical box.

It relates more particularly to a cable gland for an electrical box, comprising:

- a support plate made of a rigid material, which has a substantially planar face and which has at least one cable passage opening, and

a seal made of a flexible material which extends around said opening to provide a seal between the support plate and the rest of the electrical box.

An electrical box typically has a rear case and a front frame for snapping onto the rear case. These boxes are then designed to receive mechanisms such as socket or switch mechanisms or even detectors.

To wire these mechanisms, it is necessary to provide cable gland ends allowing the entry of an electric cable into the electrical box and making it possible to preserve the tightness of the electrical box, as long as a cable is introduced through this end. only when left unused.

The rear housing then has recessed notches in its front edge, designed to receive these cable gland end pieces, which end pieces have a pierceable cover for the passage of a cable.

If the seal between the rear housing and the front frame is generally achieved by means of a first seal which extends to the junction between these two elements, the seal around the cable gland end is achieved. by means of two other seals, namely:

- a second rectilinear seal which generally extends over the edge of the end piece to provide the seal between the end piece and the front frame, and

a third seal which extends over one face of the end piece, in a plane distinct from the second gasket, and which makes it possible to preserve the seal between the end piece and the rear housing. These second and third seals being made in separate planes on the end piece, they are expensive to manufacture and only provide the desired level of tightness if the two parts of the box are firmly fixed in compression against one another. other by means of threaded screws or quarter-turn screws.

The aim of the present invention is therefore to provide a new cable gland end piece which has one and the same seal capable of ensuring good sealing between the various components of the box.

More particularly, according to the invention, a cable gland end piece is proposed as described in the introduction, in which the seal comprises a main part with a closed contour which extends entirely over said substantially planar face of the support plate.

Thus, the seal is not provided on the outer peripheral edge (that is to say on the edge) of the support plate of the cable gland end piece, but rather on one of the faces of this end piece. .

It is thus designed to operate not in high compression when the two front and rear parts of the box are assembled, but rather by limited compression, the sealing being ensured by the continuous nature of the seal.

Indeed, the support plate being preferably intended to be attached by a sliding movement in grooves located recessed in the front and rear parts of the electrical box, the seal is provided to engage in these grooves, by compressing between the support plate and one of the edges of each groove.

As a result, it is no longer necessary to fix the two parts of the box by compressing them strongly against one another to ensure the desired seal. The compression of the seal is effectively independent of the way in which the mechanical locking function between the two parts of the box is fulfilled. As a result, simple means of snap-fastening the two parts of the box may be sufficient to ensure the desired level of tightness (here a level corresponding to the IP55 standard).

Finally, thanks to the invention, the cable gland can be easily extracted from the electrical box, which facilitates the fixing of the rear part of the box to its support and which also facilitates the insertion of the electrical conductors through. of this tip.

Other advantageous and non-limiting characteristics of the cable gland end piece according to the invention are as follows:

- said seal has a uniform cross section along the entire closed contour; the support plate has an outer peripheral edge and the main part of the seal extends at a distance from said outer peripheral edge;

- Said seal comprises two bulges which are located at a distance from each other and which each extend at least in part on said substantially planar face, between the main part and the outer peripheral edge of the wafer; support;

- The two bulges extend from the main part to the outer peripheral edge of the support plate, over at least part of the thickness of the support plate;

- the main part forms a ring or a lip;

- Said closed contour is of quasi-circular shape;

- Said opening is closed at least in part by a cover made of the same material as the seal.

The invention also relates to an electrical box comprising:

- at least one cable gland as mentioned above,

- a rear part comprising a bottom wall provided with means for fixing to a receiving support and a side wall bordering said bottom wall, and

- a front part comprising a side wall attached to said rear part so that the side wall of the front part extends in the extension of the side wall of the rear part and defines therewith a housing adapted to receive a mechanism of electrical equipment, in which said side walls comprise, recessed in their edges, notches facing each other which receive a cable gland end piece as mentioned above.

Preferably:

- Each side wall comprises, along said notch, a wall element and a flange which together define a receiving groove for the cable gland end piece;

- on one of said side walls, the wall element and said rim extend outside said notch to together define a groove for engaging the edge of the other side wall;

- Another seal is provided located in the engagement groove when the front and rear parts are assembled;

- the front and rear parts are snap-fastened together. Thus, the notches provided opposite each other in the front part and in the rear part of the box to accommodate the cable gland end piece each define a groove for receiving the edge of the cable gland end piece. The continuity between these two receiving grooves then facilitates the sealing of the connection between the different parts of the box.

The invention also relates to an electrical device comprising an electrical box as mentioned above, an electrical device mechanism received in the housing delimited by the side walls of said electrical box, and a cover which closes said electrical box at the front.

The description which will follow with reference to the appended drawings, given by way of nonlimiting examples, will make it clear what the invention consists of and how it can be implemented.

In the accompanying drawings:

- Figure 1 is a schematic exploded perspective view of an electrical apparatus comprising an electrical box according to the invention,

- Figure 2 is a schematic assembled perspective view of the electrical box of Figure 1,

- Figure 3 is a schematic front perspective view of the rear part of the electrical box of Figure 1,

- Figure 4 is a schematic rear perspective view of the front part of the electrical box of Figure 1,

- Figure 5 is a schematic perspective view of a sealed cable gland of the electrical box of Figure 1,

- Figure 6 is a schematic perspective view of a section along the plane PI of Figure 2 of the electrical box of Figure 1, and

- Figure 7 is a schematic front perspective view of the sealed cable gland end piece of Figure 5 engaged in the rear part of the electrical box of Figure 3.

In the description which follows, the terms “front” and “rear” will be used with respect to the direction of gaze of a person on the element described. The front of this element designates the side facing the person looking at it while the rear designates the side facing the support on which said element is attached. The terms “interior” or “internal” and “exterior” or “external” will be used with reference to the electrical box itself, to denote respectively the side of an element facing the center of the electrical box and the side of the electrical box. 'an element facing the outside of this box.

In Figure 1, there is shown an electrical equipment 1 comprising an electrical box 10 according to the invention, an electrical device mechanism 20 received in a housing delimited in the electrical box 10 and a cover 30 which closes the front opening. of the electrical box 10 through which one accesses the interior of said housing and which confers its function on the electrical apparatus 1.

The electrical box 10 shown in the figures is a sealed single-station electrical box protruding from a wall wall and arranged to internally receive the electrical equipment mechanism 20.

This electrical box 10 is qualified as a single-station in the sense that it is designed to receive a single electrical equipment mechanism 20 of the type shown. As a variant, it could be a multi-station box adapted to accommodate several electrical equipment mechanisms, in which case it would have a more elongated shape.

The electrical switchgear mechanism 20 is here a socket mechanism but it could be similarly an electrical switch mechanism or even a detector mechanism (smoke, light, etc.) .

The hubcap 30 then comprises a frame 31, a well 32 for receiving an electrical plug which closes this frame 31, and a hinged cover 33 for protecting the well 32 (FIG. 1).

As shown in Figures 1 and 2, the electrical box 10 here has a generally parallelepipedal shape. It could have a different shape, for example cylindrical.

As shown in Figure 2, this electrical box 10 forms a body which generally comprises a side wall which is closed at the rear by a bottom so as to delimit a receiving housing adapted to receive the electrical equipment mechanism 20. This receiving housing is open at the front to allow access to the electrical equipment mechanism 20 inserted in said housing.

As shown in Figures 1, 3 and 4, the electrical box 10 is in practice made in two distinct parts: a rear part 100 called in the following text "support plate 100" and a front part 200 called "thereafter". frame 200 ”. The support plate 100 is intended to be fixed to the partition or wall and support the electrical equipment mechanism 20, while the frame 200 has a function of protecting this electrical equipment mechanism 20 and of supporting the trim 30 (which we recall that it allows the user to interact with the electrical switchgear mechanism 20).

The support plate 100 is here made in a single piece of molded plastic, while the frame 200 is produced by the interlocking of two pieces to simplify its production by molding.

As shown in Figure 3, the support plate 100 comprises a bottom wall 120 bordered by a side wall 110 which rises from the bottom wall 120, substantially perpendicular to the latter. The side wall 110 of the support plate 100 follows a generally rectangular, in particular square, contour with straight panels 115A, 115B connected by angled portions forming cut-angled corners.

As shown in Figure 3, the bottom wall 120 of the support plate 100 is provided with means for fixing to a receiving support, here the partition or wall (not shown). For this, the bottom wall 120 of the support plate 100 has circular orifices 127 here closed by pierceable sealing caps. These circular holes 127 can be crossed by screws (not shown) in order to fix the support plate 100 on the partition or wall.

The bottom wall 120 of the support plate 100 also has holes 128 of oblong shape, through which screws can also be screwed. These two orifices 128 extend in length along perpendicular axes. The oblong shape of these orifices 128 makes it possible, before fixing the support plate 100 on the partition or wall wall, to adjust the mounting orientation of the support plate 100 on the partition or wall wall.

The bottom wall 120 of the support plate 100 also comprises a central opening 123, closed here by a tear-off sealing cap for the passage for example of an electric cable (U1000R02V or H07RNF), of an electrical sheath of the type ICTA or an IRL tube.

As shown in Figure 3, the side wall 110 of the support plate 100 has, on two opposite straight panels 115A, a determined and uniform maximum height H1.

On the two other opposite right panels 115B of the side wall 110 of the support plate 100, the height of this side wall 110 decreases locally, from the maximum height H1, to a minimum height hl. This minimum height hl is for example less than or equal to 10% of the maximum total height H3 of the overall side wall of the electrical box.

This local decrease in height, from the maximum height H1 to the minimum height h1, forms a notch 111 in the side wall 110 of the support plate 100 which delimits a first entry opening portion 111 inside the the electrical box 10. Here, two first portions of inlet openings 111 are therefore formed on the corresponding opposite straight panels 115B of the side wall 110 of the support plate 100.

As also shown in Figure 3, the side wall 110 of the support plate 100 has a particular shape, with a wall element 116 which extends in the extension of the rest of the side wall 110, and a parallel rim 117 shaped so as to define with this wall element 116 an engagement groove 118 open towards the front. This engagement groove 118 extends along the front edge of this side wall 110 and opens out, at the level of the first portions of openings 111 formed in the opposite right panels 115B of the side wall 110 of the support plate 100, in receiving grooves 114. In fact, the side wall of the support plate 100 also has, at the level of each first part of openings 111, a wall element 112 which extends in the extension of the rest of the wall. side 110, and a parallel flange 113 shaped so as to define with this wall element 112 a receiving groove 114 (see also FIG. 7).

The engagement groove 118 thus has two opposite parts, the ends of which open into the receiving grooves 114.

There is provided in the engagement groove 118 (and not in the receiving groove 114), a seal 130 (Figures 3 and 7).

This seal 130 has two parts which respectively extend along the two parts of the engagement groove 118. It is designed to deform when the frame 200 is fitted into the support plate 100. It then ensures a sealed assembly between the support plate 100 and the frame 200.

As shown in Figures 1, 3 and 7, the receiving groove 114 extending along each first entry opening portion 111 is intended to receive, by sliding, a cable gland 300.

Here, according to the embodiment shown of the electrical box 1, two cable gland ends 300 are mounted on the support plate 100, in the first two opening parts 111. inlet formed on the corresponding opposite straight panels 115B of the side wall 110 of the support plate 100.

The invention relates here more particularly to these cable gland ends 300.

As shown in Figure 5, each cable gland 300 comprises a support plate 310 delimited between an inner peripheral edge 313 and an outer peripheral edge 312.

This support plate 310 here has a flat, generally square shape, with two adjacent rounded rear corners. As a variant, the support plate can have any suitable shape, in particular rectangular or circular.

It has an outer face 319 and an inner face 311 that are substantially planar.

The inner peripheral edge 313 internally delimits an opening 315 for the passage of an electric cable or an ICTA type electric sheath or an IRL tube which carries such an electric cable.

The opening 315 here has an outline of generally circular shape, with a straight part located between the two rounded corners of the support plate.

Accordingly, the inner peripheral edge 313 of the support board 310 has a circular shape with a straight portion, while the outer peripheral edge 312 has a square shape with two adjacent rounded corners.

As shown in Figure 5, the internal face 311 of the support plate 310 is perfectly flat.

As shown in Figure 6, the outer face 319 of the support plate 310 has three concentric flat parts, including a central part 319A, an intermediate part 319B which is higher towards the outside than the previous one so as to form a first hook. , and a peripheral part 319C which is the lower so as to form a second hook with the intermediate part 319B.

The first hook delimits the external zone of the support plate 310 covered by a cover 330 (FIG. 5); 340 (figure 6).

The second hook delimits the external zone of the support plate 310 which engages in the support plate 100 or the frame 200.

As shown in Figure 7, a rear part of the support plate 310 of each cable gland 300 is provided to be slid in the receiving groove 114 of said first inlet opening portion 111 formed in the corresponding right panel 115B of the side wall 110 of the support plate 100.

This rear part of the support plate 310 has for this purpose a shape complementary to that of the receiving groove 114 so as to be able to fit into the latter.

As will be described later, a front part of the support plate 310 is for its part intended to be slid in a similar groove 214 of a second inlet opening part 211 formed in the side wall 210 of the frame 200 ( see figure 4).

For this purpose, it has a shape complementary to that of the groove 214 so as to be able to fit into the latter.

The operculum 330; 340 provided on each cable gland 300 is flexible and perforable. It is overmolded on the external zone of the support plate 310 delimited by the first hook, so as to close said opening 315 and to be adapted to be traversed by an electric cable, or an electrical sheath of ICTA type or even an IRL tube.

It is for example a membrane of elastomeric material. This cover 330; 340 is adapted to deform under the action of the electric cable, the electric sheath or the tube applied against it, stretch and tear so as to allow the electric cable or the tube or the electric sheath to pass.

It can be seen in FIG. 6 that this end piece can have concentric circular ribs internally, facilitating its cutting to allow the passage of a single cable or tube or sheath, and making it possible to ensure better sealing around the latter. As a variant, as shown in FIG. 5, the ribs could be distributed around two distinct centers, so as to facilitate its cutting into two zones to ensure the passage of two sheaths, tubes or cables.

It will be noted that each cover 330; 340 may include one or more rigid elements in order to facilitate its cutting.

To allow mounting of the electrical equipment mechanism 20 in the electrical box 10, the bottom wall 120 of the support plate 100 carries uprights 121 (FIG. 3). These uprights 121 extend forward from the bottom wall 120. They extend perpendicularly thereto.

The uprights 121 are formed integrally, of molded plastic material, with the support plate 100. There are provided here four uprights 121 arranged, in pairs, symmetrically with respect to the center of the bottom wall 120 of the support plate 100.

This center is therefore a center of symmetry for the positioning of the uprights 121. This central symmetry in the positioning of the uprights 121 of the support plate 100 makes it possible to authorize the mounting of the electrical equipment mechanism 20 in the electrical box 10 in different positions offset from one another by 90 degrees by rotation about an axis orthogonal to the bottom wall 120 of the support plate 100 and passing through the aforementioned center.

Each upright 121 here has a front part 121A and a rear part 121B.

The front part 121A has a smaller thickness than the rear part 121B, then forming a hook. This release allows the formation of a stop which allows, when mounting the electrical equipment mechanism 20 in the electrical box 10, to position the base of the electrical device mechanism 20 in the electrical box 10 at a determined distance from the bottom wall 120 of the support plate 100 so as to leave a free space for easily placing the electrical connection wires.

The front parts 121A of the uprights 121 are shaped to allow snap-fit mounting of the base of the fitting mechanism 20.

As shown more particularly in FIG. 1, the base of the fitting mechanism 20 comprises at its four corners, four identical latching means 21 adapted to cooperate with the uprights 121. Each latching means 21 essentially comprises , a part which slides on the uprights 121 and a protruding tooth which hooks into a window made in the front part 121A of each upright 121.

Furthermore, as shown in Figure 4, the frame 200 comprises the side wall 210 which is in the form of a sleeve. This side wall 210 is designed to be attached to the side wall 110 of the support plate 100 in order to extend in the extension thereof. For this it follows a generally rectangular contour, in particular square, with straight panels 215A, 215B connected by angled portions forming corners with cut angles, in correspondence with the contour of the side wall 110 of the support plate 100.

An extension 220 in the form of a frame of lower height is attached by fitting onto the front edge of the frame 200. Thus, the frame 200 is produced by the association by clipping of the sleeve formed by the side wall 210 and of the extension 220. For this, the extension 220 has four clips arranged at the four corners, which are housed in correspondingly shaped housings provided at the four corners of the frame 200.

The use of two sub-parts for the production of the frame 200 makes it possible to simplify its design by molding. This extension 220 has an aesthetic and protective function. It is in fact designed to receive the trim 30 internally. As a variant, the frame could be made in one piece, for example of molded plastic.

For fixing the cover 30, as shown in Figure 2, the frame 200 has on the inner face of its side wall 210 holes 221 for fixing the cover 30. These holes 221 are adapted to receive elements allowing mounting the cover 30 on the frame 200. These mounting elements (not visible) are for example quarter-turn elements, operable from the front face of the cover 30.

Similarly to the side wall 110 of the support plate 100, as shown in Figure 4, the side wall 210 of the frame 200 has, on two opposite right panels 215A extending in the extension of the opposite right panels 115A of the side wall 110 of the support plate 100, a determined and uniform maximum height H2.

On the two other opposite right panels 215B, extending themselves in the extension of the opposite right panels 115B of the side wall 110 of the support plate 100, the height of this side wall 210 decreases locally, from the maximum height H2, up to 'at a minimum height h2. This minimum height h2 is for example less than or equal to 20% of the maximum total height H3 of the electrical box 10 (FIG. 2).

This local decrease in height in the side wall 210 forms a notch 211 which delimits said second inlet opening portion 211.

Here, two notches, i.e. two second entry opening portions 211, are formed on the opposite right panels 215B of the side wall 210 of the frame 200.

In addition, the notch formed in the free edge of the frame 200 is located opposite the corresponding notch formed in the support plate 100. Each second inlet opening portion 211 is intended to come into correspondence with the one of the first inlet opening portions 111 formed on one of the other opposing straight panels 115B of the side wall 110 of the support plate 100.

Thus, the combination of a first entry opening part 111 of the side wall 110 of the support plate 100 with a second entry opening part 211 of the side wall 210 of the frame 200, during the '' assembly of the support plate 100 and the frame 200 described below, forms a complete inlet opening. Here, two full inlet openings are formed on two opposing panels of the electrical box. Alternatively, the inlet openings could be formed on two adjacent panels of the side wall of the body. Still alternatively, a greater number of inlet openings could be provided.

As previously mentioned, similarly to the side wall 110 of the support plate 100, the rear edge of the side wall 210 of the frame 200 has, along each second inlet opening portion 211, a wall element. 212 which extends in the extension of the rest of the side wall 210 of the frame 200, and a parallel flange 213 which defines with this wall element 212 a receiving groove 214 open towards the rear (see Figures 4 and 6) . This receiving groove 214 is also intended to receive, by sliding, the front part of the cable gland 300.

Apart from the part which runs along each second entry opening part 211, the rear edge of the side wall 210 of the frame 200 has a rib 216 adapted to be inserted or nested in the engagement groove 118 formed along the front edge of the side wall 110 of the support plate 100, during the assembly of the support plate 100 and the frame 200.

As a variant, the groove can obviously be provided on the rear edge of the front part of the electrical box and the rib on the front edge of the rear part of the electrical box.

The peripheral seal 130 described above and making it possible to establish a sealed junction between the front edge of the side wall 110 of the support plate 100 and the rear edge of the side wall 210 of the frame 200 is therefore positioned between the faces of said groove. engagement 118 and said rib 216.

In addition, to ensure the tightness of the electrical box 10, a seal 320 is also interposed between the support plate 310 of each cable gland 300 and the side walls 110, 210 of the support plate 100 and of the frame 200.

As shown in Figure 5, according to a particularly advantageous characteristic of the invention, this seal 320, which is more flexible than the support plate 310, comprises a main part 321 which extends entirely over the internal face 311. of the support plate 310, according to a closed contour around the opening 315, to provide a seal around this opening 315. The seal 320 also includes two bulges 322 which extend from the main part 321 with the closed contour, outwards, in order to ensure the seal between the support plate 310 and the rest of the box. electric 10.

Thus, thanks to the shape of this seal 320, the cable gland end piece 300 is independent of the box to ensure its seal at its junction with the rest of the electrical box 10.

If it is here provided that the seal 320 extends over the internal face 311 of the support plate 310, one could alternatively provide that it extends over a flat part of the external face of this plate. -support 310.

The seal 320 is in any case intended to end up being compressed between the support plate 310 and one of the edges delimiting the receiving grooves 114, 214 provided in the side walls 110, 210 of the plate. support 100 and frame 200.

This compression of the seal 320 is therefore carried out during the installation of the cable gland end piece 300 in these receiving grooves 114, 214. Its compression is therefore independent of the force with which the plate -support 100 and the frame 200 are brought into contact with one another.

The main part 321 of the gasket 320 has a uniform cross section along the entire closed contour of the gasket. It forms here a quasi-circular ring, the cross section of which is half-disc. Alternatively, it could form a lip.

The closed contour defined by the seal 320 is here qualified as “quasi-circular” in the sense that it may have, as is the case here, a rectilinear portion to follow the shape of the inner peripheral edge 313 of the support plate 310.

This main part 321 of the seal 320 extends at a distance from the inner peripheral edges 313 and outer 312 of the support plate 310.

It makes it possible to ensure a good seal around the opening 315 of the support plate 310. However, it does not make it possible to ensure such a good seal at the junction between the support plate 100 and the frame 200 at the level of the 'entry opening provided in the box to receive the cable gland 300.

Indeed, the other seal 130 located in the engagement groove 118 of the side wall 110 of the support plate 100 is not intended to come into contact with the main part 321 of the seal 320. of the cable gland 300. The two bulges 322 are then provided to provide the junction between the other seal 130 and the main part 321 of the seal 320.

These two bulges 322 are located at a distance from one another, and more precisely here diametrically opposed to the main part 321 of the seal 320. In other words, they extend lengthwise. in a plane corresponding to the junction plane of the support plate 100 and the frame 200.

They each have a first part 322A which extends radially from the main part 321 to the outer peripheral edge 312 of the support plate 310, and a second part 322B which extends over the outer peripheral edge 312 of the plate. support 310, that is to say on the edge of this support plate 310, over part of the thickness of this edge.

As is clearly shown in FIG. 7, each bulge 322 is thus designed to be placed at the level of the interface between the support plate 100 and the frame 200. It is observed in this figure that the part 322B of each bulge 322 which projects over the edge of this support plate 310 makes it possible to make the junction between the main part 321 of the seal 320 and the other seal 130 provided in the engagement groove 118 of the side wall 110 of the plate -support 100.

As shown in Figure 6, the seal 320 is molded in a groove provided correspondingly recessed in the internal face 311 of the support plate 310, which ensures better grip of the seal 320 on the plate. -support 310. This groove has a rectangular section and is open inwards. It extends under the assembly of the seal 320.

Here, the seal 320 is produced in a single piece, in a single material (for example in elastomer of SEBS type).

This seal 320 is made of the same material as the cap 330; 340, and it is formed at the same time as the latter, by overmolding on the support plate 310.

The cable gland 300 is designed to be held between the frame 200 and the support plate 100 by simple interlocking, when these two elements are fixed together.

The interlocking of the rib 216 of the frame 200 in the groove of the support plate 100 ensures a relative blocking of the frame 200 with respect to the support plate 100 in a plane parallel to the plane of the partition or wall wall. On the other hand, this interlocking does not make it possible to block the frame 200 with respect to the support plate 100 along an axis orthogonal to this plane. To ensure this locking, the support plate 100 and the frame 200 comprise complementary attachment means intended to lock the assembly of the frame 200 on the support plate 100. These complementary attachment means are here snap-fastening means. unlockable.

There are provided here four sets of complementary attachment means respectively located at the four corners of the electrical box 10. This ensures a robust fixing of the frame 200 on the support plate 100 while freeing space to the inside the electrical box 10 to allow an optimized arrangement of the electrical cables.

As shown in Figure 3, each attachment means provided on the support plate 100 is in the form of a notch 150 formed integrally with the support plate 100, here by molding a plastic material. .

Each notch 150 projects from the inner face of each angled portion of the side wall 110 of the support plate 100 and has a pointed profile facing inward.

As shown in Figure 4, each attachment means provided on the frame 200 and intended to cooperate with each notch 150 of the support plate 100 is carried by a lever 250. Each lever 250 is formed integrally with the side wall 210 of the frame 200 and projecting from the inside face of each angled portion of this side wall 210.

Each lever 250 is in the form of a rectangular plate bordered by two stiffening flanks.

Each lever 250 is attached to the side wall 210 of the frame 200 only by its front end. It is elastically deformable at its junction with the side wall 210 of the frame 200, which then forms a hinge.

Each lever 250 has an opening 251 adapted to engage on the corresponding notch 150 of the support plate 100. This opening 251 in particular has a front edge adapted to hook onto a rear face of the notch 150 so as to lock the frame. 200 on the support plate 100.

The rear end of each lever 250 is bent towards the inside of the frame 200 so as to form a flange 252. This flange 252 comprises a slot 253 into which the end of a tool such as a screwdriver can be inserted, for example to disengage the notch 150 of the lever 250 in order to release the lever 250 (and therefore detach the attachment means of the frame 200 from that of the support plate 100). When mounting the electrical equipment 1 projecting onto a wall partition, the installer first fixes the support plate 100 on the wall by inserting screws into the oblong holes 128 (figures 2, 4 and 5) and adjusting its orientation. It optionally also introduces screws through the circular holes 127 to stiffen the fixing.

Then, the installer introduces an electric cable or an electric sheath through the waterproofing membrane 330; 340 of the cable gland 300 then inserts the support plate 310 of this cable gland 300 in the groove 114 formed in the side wall 110 of the support plate 100, along the first opening portion d 'entry 111.

In doing so, a rear part of the seal 320 of this cable gland 300 comes to rest against the wall element 112 of the support plate 100.

The installer then cables the electrical equipment mechanism 20 and then positions it on the uprights 120 of the support plate 100.

Once the electrical switchgear mechanism 20 has been mounted and electrically connected, the installer assembles, on the support plate 100, the frame 200 provided with its extension 220, by interlocking thanks to the complementary assembly means and by snap-fastening thanks to the means of 'complementary attachment.

In doing so, a front part of the seal 320 of this cable gland 300 comes to rest against the rim 213 of the side wall 210 of the frame 200.

Finally, the installer mounts the cover 30 in the openings 221 of the side wall 210 of the frame 200 in order to hermetically close the front opening of the electrical box 10 and to give its function to the electrical equipment 1.

The present invention is not limited to the embodiments described and shown in the various figures, but those skilled in the art will know how to make any variant in accordance with their spirit.

Thus, in the various figures, the electrical box has a section of square shape and it defines a single station making it possible to accommodate one or two electrical equipment mechanisms: this is said to be a single station box.

As a variant, it could be a multi-station box, having a section of rectangular shape and defining two or three stations. In this variant, the electrical box will preferably include a frame defining several openings, each being intended to receive a station.

Claims

1. Cable gland (300) for electrical box (10), comprising:

- a support plate (310) made of a rigid material, which has a substantially planar face (311) and which has at least one opening (315) for passing the cable, and

- a seal (320) made of a flexible material which extends around said opening (315) to provide a seal between the support plate (310) and the rest of the electrical box (10), characterized in that the seal (320) comprises a main part (321) with a closed contour which extends entirely over said substantially planar face (311).

2. Cable gland (300) according to the preceding claim, wherein said main portion (321) has a uniform cross section along the entire closed contour.

3. Cable gland (300) according to one of the preceding claims, wherein the support plate (310) has an outer peripheral edge (312) and wherein said main portion (321) extends away from said edge. outer peripheral (312).

4. Cable gland (300) according to one of the preceding claims, wherein the support plate (310) has an outer peripheral edge (312) and wherein said seal (320) has two bulges (322) ) which are located at a distance from each other and which each extend at least in part on said substantially planar face (311), between the main part (321) and the outer peripheral edge (312) of the wafer -support (310).

5. Cable gland (300) according to the preceding claim, wherein the two bulges (322) extend from the main part (321) to the outer peripheral edge (312) of the support plate (310), over at least part of the thickness of the support plate (310).

6. Cable gland (300) according to one of the preceding claims, wherein said main part (321) forms a ring or a lip.

7. Cable gland (300) according to one of the preceding claims, wherein said closed contour is of quasi-circular shape.

8. Cable gland (300) according to one of the preceding claims, wherein said opening (315) is closed at least in part by a cover (330; 340) made of the same material as the seal ( 320).

9. Electrical box (10) comprising:

- a rear part (100) comprising a bottom wall (120) provided with fixing means (127, 128) to a receiving support and a side wall (110) bordering said bottom wall (120), and - a front part (200) comprising a side wall (210) attached to said rear part (100) so that the side wall (210) of the front part (200) extends in the extension of the side wall (110) ) of the rear part (100) and defines therewith a housing adapted to receive an electrical equipment mechanism (20), characterized in that it comprises at least one cable gland end piece (300) according to one of the preceding claims, and in that said side walls (110, 210) comprise recessed in their edges facing notches (111, 211) which receive a cable gland end piece (300) according to one of the preceding claims.

10. Electrical box (10) according to the preceding claim, wherein each side wall (110, 210) comprises, along said notch (111, 211), a wall element (112,

212) and a flange (113, 213) which together define a receiving groove (114, 214) of the cable gland (300).

11. Electrical box (10) according to the preceding claim, wherein, on one of said side walls (110), the wall element (112) and said flange (113) extend outside said notch (111). to together define an engagement groove (118) from the edge of the other side wall (210).

12. Electrical box (10) according to the preceding claim, wherein there is provided a further seal (130) located in the engagement groove (118) when the front and rear parts (100, 200) are assembled.

13. Electrical box (10) according to one of the four preceding claims, wherein the front and rear parts (100, 200) are fixed together by snap-fastening.

14. Electrical equipment (1) comprising an electrical box (10) according to one of the preceding claims, an electrical device mechanism (20) received in the housing delimited by the side walls (110, 210) of said electrical box. (10), and a cover (30) which closes said electrical box (10) at the front.