FR3033345A1 - BAC, ASSEMBLY COMPRISING SUCH A BAC AND METHOD FOR INSTALLATION OF SUCH AN ASSEMBLY ON A WALL - Google Patents

Abstract

The present invention relates to a trough (16) intended to be mounted on a frame (14) fixed on a wall (12) around an opening formed in the wall (12), the trough (16) being intended moreover to be recessed in the bay, the tray (16) comprising a bottom and two side walls (76) extending substantially perpendicular to the bottom. Each side wall (76) is provided on its outer surface with at least one guide member (28A), each guide member (28A) being adapted to cooperate with a receiving element (26) on the frame (14), for guiding longitudinal translation of the tray (16) relative to the frame (14), and with a locking element (30A) on the frame (14), adapted to lock the tray (16) in longitudinal translation relative to the frame (14) ).

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a tray intended to be mounted on a frame fixed to a wall, around a bay formed in the wall, and to be embedded in the bay. More particularly, the invention relates to a tray adapted to receive one or more module (s) box type (s) electrical (s) inside the tray. The invention also relates to an assembly comprising such a tray, and a method of installing such an assembly on the wall. STATE OF THE PRIOR ART [0002] Trays intended to be recessed in a bay formed in a wall are well known. Such bins generally comprise a bottom and four side walls extending substantially perpendicular to the bottom. A problem encountered in this type of tray is that of its installation in the bay, especially when electrical ducts extend longitudinally through the bay. Such electrical sheaths 20 each comprise at least one electrical cable and / or at least one electrical wire used for example to electrically connect electrical modules subsequently installed inside the tray. The installation of the tank in the bay is then made difficult by the presence of electrical ducts extending through the bay. [0004] A known solution to this problem is to provide that one of the side walls of the tray is retractable. An opening is for example made in the bottom of the tray, so that when the retractable side wall is assembled on the tray, the electrical ducts can extend through the opening on the bottom of the tray. When the retractable side wall 3033345 2 is disassembled from the tray, the tray can be installed more easily by first positioning the free ends of the electrical ducts on the bottom of the tray, through the space left at the location of the retractable wall , then inserting the tray with the sleeves into the bay.

Once the tray inserted in the bay, we can re-assemble the retractable side wall on the tray, then fix the tray on the wall.  [0005] However, although often reversible, such bins are generally oriented with respect to the positioning of their retractable side wall, which means that their installation is facilitated only in a singular presentation configuration of the electrical sheaths, for example according to the invention. meaning from above or from the bottom.  When the electrical conduits are in a configuration where the ducts come from above and from below, the installation of such bins in the bay is made difficult or impossible.  In addition, another disadvantage of this type of tray is related to the fact that an installer must support the entire weight of the tray when it is placed in the bay.  This can affect in particular the accuracy and efficiency of the tray installation operation.  DESCRIPTION OF THE INVENTION The invention described hereinafter aims to remedy all or part of the disadvantages of the state of the art and in particular to provide a tray that can be installed easily within an array in a regardless of the configuration of electrical connection conduits extending through the bay, while providing a more accurate and efficient installation.  This objective is achieved through a tray to be mounted on a frame attached to a wall around a bay formed in the wall, the tray being further intended to be embedded in the bay, the tray comprising a bottom and two side walls extending substantially perpendicular to the bottom, wherein each side wall is provided on its outer surface with at least one guide member, each guide member 3033345 3 being adapted to cooperate with a receiving member on the frame for guiding longitudinal translation of the tray relative to the frame, and with a blocking element on the frame, adapted to block the container in longitudinal translation relative to the frame.  [0008] Thus, this solution makes it possible to achieve the aforementioned objective.  In particular, thanks to the presence of at least one guide member on each side wall of the tray, the tray can be installed easily, accurately and efficiently within the bay.  Furthermore, unlike existing assemblies in which the various components of the assembly assemble around the previously installed tray, the tray according to the present invention allows assembly around the frame, which becomes the first piece to fix on Wall.  The frame being lighter and more maneuverable than the tray, the assembly operation of the assembly is thus facilitated.  In addition, at the time of installation of the tray on the frame, a portion of the weight of the tray is carried by the frame, which again improves the ease and accuracy of installation of the tray.  Finally, the tray according to the present invention being symmetrical, it does not require any particular orientation when positioning it.  Thus, the installation of the tray is facilitated regardless of the configuration of electrical conduits extending through the bay.  According to a particular technical feature of the invention, the tray further comprises at least one gripping handle, each handle being formed of a recess formed in one of the side walls.  [0010] This characteristic offers an installer an easy and intuitive grip of the tray, thereby improving the handling of the tray.  According to a particular technical feature of the invention, the tray further comprises at least two rails attached to the bottom of the tray.  Advantageously, the tray further comprises at least one longitudinal chute fixed to the tray, the longitudinal chute being configured to allow fixing by clipping or screwing of at least one element on the chute.  In a particular embodiment of the invention, the tray has a substantially rectangular longitudinal section, and the largest dimension of said substantially rectangular section is smaller than the largest dimension of the frame.  This further facilitates the installation of the tray on the frame, inside the bay, when electrical ducts extend through the bay in a direction from below.  Advantageously, the tray further comprises at least a third retractable side wall, the third retractable wall extending substantially perpendicularly to the bottom.  This third side wall thus forms an aperture plate that can be installed on the tray once it is mounted on the frame and recessed in the bay.  This third retractable side wall makes it possible to improve the external appearance of the assembly once it is installed.  This patch plate also keeps the electrical ducts at the bottom of the tank.  According to a particular technical feature of the invention, each guide member comprises an axis projecting from the outer surface of the associated side wall, substantially perpendicular to a plane defined by this side wall, each axis 25 being arranged in the vicinity an upper corner of said side wall.  According to another aspect, the invention also relates to an assembly intended to be mounted in a bay formed in a wall, the assembly comprising: 3033345 5 - a tray as described above, the tray being intended to be recessed in the bay, - a frame for opening to be fixed on the wall around the bay formed in the wall, the frame being provided with a central opening and comprising at least two elements for receiving an organ for guiding and at least two locking elements of a guide member, each receiving element being adapted to cooperate with at least one of the guide members of the tray for guiding in longitudinal translation of the tray relative to the frame, each element of blocking being adapted to cooperate with one of the tray guide members for locking in longitudinal translation of the tray relative to the frame.  According to a particular technical feature of the invention, the frame further comprises at least two locking elements of a guide member, each locking element being able to cooperate with one of the guide members of the tray for the locking in the tray position on the frame.  Advantageously, each locking element is formed of a metal lug comprising a first portion fixed on the frame and a second portion forming a curved elastic finger intended to be snapped around a free end of one of the guiding, for the locking in position of the tray on the frame.  This allows, in addition to the locking position of the tray on the frame, 25 to pivot the tray relative to the frame when one of the guide members of the tray is inserted into the curved elastic finger of the locking member.  According to a particular technical characteristic of the invention, each locking element is formed of an oblong slot formed in one of the receiving elements, each oblong slot being intended to receive a free end of one of the members guide, for locking the tray in position on the frame.  In a particular embodiment of the invention, the assembly further comprises a panel mounted on the frame, the panel being movable relative to the frame, between a closed position in which the panel prevents access to the frame. inside the tray, and an open position in which the panel allows access to the interior of the tray.  The panel is a removable and reversible panel, in that it can be mounted indifferently on the left or on the right of the frame.  This is particularly advantageous when installing the panel on the frame.  Indeed, the panel being mounted last, the installation of it by the installer is facilitated.  In another particular embodiment of the invention, each side wall of the tank is provided on its outer surface with two axes, the frame comprises two elements for receiving a guide member, each receiving element being formed of a longitudinal slide extending substantially perpendicular to the wall when the frame is fixed on the wall and being adapted to cooperate with each of the axes of the same side wall of the tray, and the frame comprises at least three locking elements d a guide member, each locking member being formed of a notch formed in one of the receiving rails, each notch further forming a means for pivoting the tray relative to the frame when one of the axes of the tray is inserted into the notch.  According to another aspect, the invention also relates to a method 25 for installing a set on a wall provided with a bay, at least one electrical sheath extending longitudinally through the bay, since a internal space delimited by the wall towards the outside of the wall, the method comprising the following steps: - providing an assembly as described above, the assembly further comprising a panel, - positioning the central opening of the frame facing the bay formed in the wall and press the frame on the wall, so that the or each electrical sheath extends through the bay and through the central opening of the frame, - set the frame on the wall, around the bay, - position the tray in the central opening of the frame and in the bay, so that two upper guide pins, each belonging to a separate side wall of the tray, come into position. cooperation with the barriers of rec eption, and that the or each electrical sheath extends opposite the bottom of the tray, the side of the side walls of the tray, from the interior space delimited by the wall towards the outside of the wall, 15 - move the tray in longitudinal translation relative to the frame, by guiding the two upper guide pins on the receiving rails, until each upper guide pin fits into an upper notch, thereby blocking the longitudinal translation of the tray, - rotate the tray relative to the frame, so as to position at least one of the two lower guide pins in the one or one of the remaining notches (s), and - mount the panel on the frame.  In a particular embodiment of the invention, the wall has an inner surface and an outer surface separated by a distance corresponding to the thickness of the wall, the frame comprises: 3033345 8 - two vertical uprights and two sleepers horizontal, the two vertical uprights and the two horizontal crosspieces defining the central opening; means for fixing the frame to the wall, comprising at least one screw and at least one fixing lug projecting from a portion of a stud; vertical or a horizontal cross member, in the central opening, the or each fastening tab comprising a first folding portion connected to said portion via a first weakened folding zone, and a second folding portion connected to the first folding portion via a second weakened folding zone, the first folding portion having a length greater than the thickness of the wall and being intended to extend facing one of the side surfaces of the wall partially defining the bay, the second folding portion being intended to rest on the inner surface of the wall, said portion of vertical upright or horizontal crosspiece comprising a first oblong lumen, said portion and the first folding portion being configured such that a non-zero distance separates the first collapsible portion from the side surface of the wall when the frame is secured to the wall, the second collapsible portion being provided with a second oblong slot, the second oblong slot being arranged to extend opposite the first oblong slot when the second folding portion bears against the inner surface of the wall, and the step of fixing the frame to the wall comprises the following steps: - fold down the first and second foldable portions of the or each leg fastening by folding around the first weakened folding zone, until said first folding portion 3033345 9 extends facing one of the side surfaces of the wall, inside the bay, to a non-zero distance from this surface, - fold down the second foldable portion of the or each fastening tab by folding around the second weakened folding zone, until said second folding portion bears on the inner surface of the wall, - position the frame at the desired position, by angular pivoting of the frame in the bay, - position the or each screw in the oblong first light (s) 10, - and screw the each screw in the wall and then in the or one of the second oblong light (s) extending vis-à-vis the first oblong associated light.  BRIEF DESCRIPTION OF THE FIGURES [0027] Other features and advantages of the invention will emerge on reading the description which follows, given solely by way of example, and with reference to: FIG. 1 is a perspective view an assembly according to one embodiment, comprising a frame and a tray according to the invention; Figure 2 is a perspective view of the frame according to an exemplary embodiment, the frame being provided with four support plates, each support plate comprising a bracket; Figures 3 and 4 are close-up perspective views illustrating a step of attachment to a wall of the frame of Figure 2; Fig. 5 is a perspective view of the tray of Fig. 1 according to a first embodiment; Figure 6 is an enlarged view of a detail of the embodiment of the tray of Figure 5; Figures 7 to 11 are perspective views illustrating steps of a method of installing on a wall of the assembly of Figure 1; FIG. 12 is a sectional view of a detail of the assembly of FIG. 10, taken along the axis XX of this figure, and illustrating a final step of the installation method on a wall of the all of Figure 1; Figure 13 is a perspective view of the tray of Figure 1, according to a second embodiment; Figure 14 is an enlarged view of an embodiment of the tray of Figure 13; and Figure 15 is a perspective view of a portion of the frame of Figure 1, according to a second embodiment.  DETAILED DESCRIPTION OF AN EMBODIMENT [0028] In the following description, the term "bearing on a surface" any support of all or part of an element on the surface, whether a support plane or not.  It is also understood by "vis-à-vis" a configuration in which two elements, for example two lights or openings, are located opposite one another, whether or not there is one or several 25-thirds element (s) arranged between said two elements.  In addition, in the following description, the terms "transverse", "horizontal" and "vertical" are defined in accordance with the usual directions of a tray, that is to say that the vertical and horizontal directions respectively correspond to the directions of extension in height and width of the tray, and the transverse direction corresponds to the depth of the tray.  The term "inside" and "outside" also means the spaces delimited respectively on each side of a wall of a building.  The "inside" space corresponds to the unused space behind the wall, typically a space arranged between the wall and a wall.  The "outside" space corresponds to the space used in front of the wall, in the building.  The term "part of a vertical upright or of a horizontal cross member" also means any region defined on the vertical upright or on the horizontal crossmember, which may extend up to the vertical upright or to the horizontal crossbar in together, regardless of its size and positioning on the vertical upright or on the horizontal crossbar.  In addition, "locking in position" means blocking the movement both in the transverse and vertical directions.  In Figure 1 is shown a set 1.  The assembly 1 is mounted in a bay 10 formed in a wall 12 and comprises a frame 14 for opening, and a tray 16 according to a first embodiment.  The tray 16 is mounted on the frame 14 and recessed in the bay 10.  The tray 16 is adapted to receive and attach at least one module type electric box, such a module is not shown in the figures for the sake of clarity.  The tray 16 is for example intended to be embedded in a housing of a housing.  In the embodiment of Figure 1, the assembly 1 further comprises a panel 18 mounted on the frame 14 by means of two removable hinges 20.  The panel 18 is movable relative to the frame 14, between a closed position in which the panel 18 prevents access to the interior of the tray 16, and an open position in which the panel 18 allows access inside the bin 16.  Advantageously, the panel 18 is a removable and reversible panel.  The wall 12 has an inner surface 22A and an outer surface 22B.  The inner 22A and outer 22B surfaces are separated by a distance E corresponding to the thickness of the wall 12.  The wall 12 thus forms a hollow partition and consists for example of one or more plasterboard (s).  As shown in FIG. 2, the wall 12 also has four lateral surfaces 23 defining the bay 10.  The frame 14 is provided with a central opening 24 and comprises at least two elements 26 for receiving a guide member 28A, 28B of the tray 16 and at least two elements 30A, 30B of a locking member guide 28A, 28B of the tray 16.  Each receiving member 26 is adapted to cooperate with at least one of the guide members 28A, 28B for the longitudinal translation guide of the tray 16 relative to the frame 14, as detailed below.  Each blocking element 30A, 30B is adapted to cooperate with one of the guide members 28A, 28B for locking in longitudinal translation of the tray 16 relative to the frame 14, as detailed below.  In the exemplary embodiment illustrated in FIGS. 2 to 12, the frame 14 comprises two receiving elements 26, two upper locking elements 30A and two lower locking elements 30B.  In a variant that is not shown, the frame 14 comprises two upper locking elements 30A and a lower locking element 30B or two lower locking elements 30B and an upper locking element 30A.  Preferably, the frame 14 further comprises at least two locking elements 32A, 32B of a guide member 28A, 28B of the tray 16.  Each locking element 32A, 32B is adapted to cooperate with one of the guide members 28A, 28B for the locking position of the tray 16 on the frame 14, as detailed below.  In the exemplary embodiment illustrated in Figures 2 to 12, the frame 14 includes two upper locking members 32A and two lower locking members 32B.  In a variant that is not shown, the frame 14 comprises two upper locking elements 32A and a lower locking element 32B or two lower locking elements 32B and an upper locking element 32A.  In the particular embodiment of Figures 2 to 12, the frame 14 comprises two vertical uprights 34 and two horizontal crosspieces 36, and means 38 for fixing the frame 14 on the wall 12.  The two vertical uprights 34 and the two horizontal crosspieces 36 define the central opening 24.  Each vertical upright 34 and each horizontal cross member 36 is advantageously formed of a metal section, for example made of steel.  [0041] Preferably, the fastening means 38 comprise at least one fastening tab 40 projecting from a portion 42 of a vertical upright 34 or from a horizontal cross member 36, in the central opening 24.  In the embodiment shown in FIGS. 2 to 12, the fastening means 38 comprise four fastening tabs 40, each fastening tab 40 protruding horizontally in the central opening 24, from a portion 42 of a cross-member horizontal 36.  As illustrated in Figures 2 and 3, each bracket 40 comprises a first foldable portion 44 connected to the portion 42 via a first weakened folding zone 46.  Each fastening tab 40 further comprises a second folding portion 48 connected to the first folding portion 44 via a second weakened folding zone 50.  In the embodiment of Figures 2 to 4, each bracket 40 is made of metal, for example steel.  This makes it possible to obtain both an adequate flexibility for folding the first and second portions 44, 48 at the level of the first and second weakened folding zones 46, 50, as well as a sufficient rigidity to allow a pre-hold. of the frame 14 on the wall 12.  Advantageously, each metal bracket 40 has a thickness of between 1 mm and 2 mm and preferably substantially equal to 1.2 mm, this value making it possible to obtain an optimum compromise between flexibility and rigidity for the bracket 40.  As shown in Figure 3, the first folding portion 44 has a length L1 greater than the thickness E of the wall 12, the length being taken as the dimension extending in the direction of extension 10 of the leg fixing 40.  The first folding portion 44 is intended to extend facing one of the side surfaces 23 of the wall 12, as will be detailed later.  Due to the presence of a second folding portion 48 connected to the first folding portion 44 via a second weakened folding zone 50, associated with the fact that the first folding portion 44 has a length L1 greater than the thickness E of the wall , the frame 14 can be advantageously fixed on walls of varying thickness.  In the embodiment illustrated in Figures 2 to 4, the first weakened folding zone 46 is formed of a substantially rectangular recess 20, the largest dimension of the recess being substantially perpendicular to the direction of extension of the bracket 40.  The first weakened folding zone 46 makes it possible to fold down the first and second folding portions 44, 48 at this first zone 46, without imposing the use of a tool to perform the folding.  The second folding portion 48 is intended to bear on the inner surface 22A of the wall 12, as will be detailed later.  In the exemplary embodiment illustrated in FIGS. 2 to 4, the second weakened folding zone 50 is formed of a substantially rectangular recess, the largest dimension of the recess being substantially perpendicular to the direction of the recess. extension of the fixing lug 40.  The second weakened folding zone 50 makes it possible to fold down the second folding portion 48 at this second zone 50, and without imposing the use of a tool to perform the folding.  In the particular embodiment of FIGS. 2 to 12, each horizontal cross-member 36 comprises a central portion 52 and two connecting portions 42 at one end of a vertical upright 34, arranged on either side of the central portion 52.  According to this embodiment, each fixing lug 40 projects from one of the connection portions 42 in the central opening 24.  According to this exemplary embodiment, the fastening means 38 comprise four fastening tabs 40.  Alternatively, the fastening means 38 comprise a number N1 of fastening tabs 40 each protruding from one of the connecting portions 42 in the central opening 24, where N1 is an integer between two and three.  In another variant, the fastening means do not comprise a bracket (s) 40.  Each connecting portion 42 forms a bearing plate on the outer surface 22B of the wall 12, and is attached to one end of one of the vertical uprights 34 on the one hand, and at one end of the portion central 52 of the horizontal cross member 36 associated with the other.  Each vertical upright 34 is thus able to pass from a disassembled configuration, not shown in the figures, to an assembled configuration, shown in FIGS. 1 and 2 and in which each horizontal crossmember 36 connects the two vertical uprights 34.  The fixing of each connection portion 42 on a vertical post 34 and the central portion 52 of the horizontal crosspiece 36 associated 3033345 16 for example a removable fastener.  In a variant, the fastener is an irremovable fastener.  Each connecting portion 42 is formed of a metal plate, for example steel, substantially shaped "L".  Each connecting portion 42 is provided with at least one opening 54.  In the embodiment of Figures 2 to 4, each connecting portion 42 is provided with two rectilinear openings 54, arranged to form between them an angle substantially equal to 90 degrees.  Each opening 54 allows an installer of the frame to be able to materialize, on the wall 12, 10 the location of the bay 10 to be cut, so that the dimensions of this bay 10 correspond to those of the frame 14, as will be described later.  In an alternative embodiment, not shown in the figures, each horizontal cross member 36 is formed of a single piece of material.  Each horizontal cross member 36 is for example fixed to one end of each of the vertical uprights 34.  Alternatively, each horizontal cross member 36 connects the two vertical uprights 34, the frame 14 being formed of a single piece of material.  Each portion 42 of vertical upright 34 or horizontal cross member 36 comprises a first oblong slot 56.  Preferably, each portion 42 of upright 34 or horizontal cross member 36 from which extends a bracket 40 is configured, with the first folding portion 44 of the bracket 40, so that a distance no no separates the first folding portion 44 from one of the side surfaces 23 of the wall 12 when the frame 14 is fixed to the wall 12.  In the embodiment of Figures 2 to 4, each connecting portion 42 further comprises a region 58 extending into the central opening 24, facing the bay 10 when the frame 14 is fixed on the wall 3033345 17 12.  The extension region 58 is connected to the first weakened folding zone 46 of the fastening tab 40 projecting from the associated connecting portion 42, so as to move the first folding portion 44 away from the side surface 23 of the wall 12 when the frame 14 is fixed on the wall 12.  [0054] Preferably, the first oblong slot 56 has a substantially arcuate shape whose center corresponds substantially to the center of the frame 14.  In a preferred embodiment illustrated in FIGS. 2 and 3, each second folding portion 48 is provided with a second oblong slot 60.  The second oblong slot 60 is arranged so as to extend towards the first oblong slot 56 when the second folding portion 48 bears against the inner surface 22A of the wall 12, as shown in FIG. Figures 2 to 4.  More specifically, according to the preferred embodiment illustrated in FIGS. 2 to 4, the second oblong slot 60 forms the symmetrical of the first oblong slot 56 on the second folding portion 48, with respect to an axis of symmetry parallel to the larger dimension of the substantially rectangular recess 46.  [0057] Preferably, the fastening means 38 further comprise at least one stop 62 for stopping one or more of the first (s) portion (s) foldable (s) 44.  More preferably, the fastening means 38 comprise at least one screw 64 intended to be inserted in at least one or in one of the first (s) oblong light (s) 56 and in the wall 12 25 so as to fix the frame 14 on the wall 12.  In the particular embodiment of FIGS. 2 to 12, the fastening means 38 comprise four stops 62 and four screws 64.  Each stopper 62 is arranged so as to allow the movement of the first folding portion 44 associated, with respect to the 3033345 18 part 42 vertical upright 34 or horizontal cross member 36 from which extends the leg of associated binding 40, to a position in which the first folding portion 44 is inclined at an angle substantially equal to 90 degrees relative to the portion 42.  Each stopper 62 is furthermore arranged so as to prohibit the movement of the first folding portion 44 associated with respect to the portion 42 of vertical upright 34 or horizontal crossbar 36 from which the fastening tab 40 extends. associated, when the angle defined between the first folding portion 44 and the portion 42 is greater than 90 degrees.  In the particular embodiment of FIGS. 2 to 4, each stopper 62 is formed by a curved tab projecting from the extension region 58 of one of the connection portions 42 towards the inner surface. 22A of the wall 12, inside the recess forming the first weakened folding zone 46 of the associated bracket 40.

Each curved tab 62 is adapted to cooperate with one of the surfaces of the first folding portion 44 of the associated fastening tab 40, when the first folding portion 44 is inclined at an angle substantially equal to 90 degrees relative to the portion 42, so as to block the movement of the first folding portion 44 relative to the portion 42. [0060] Each screw 64 is for example a standard plaster screw. In the preferred embodiment in which each second folding portion 48 is provided with a second oblong slot 60, the dimensions of the second oblong slot 60 are configured so that the core of a screw 64 it can pass through the second oblong slot 60, and that the threads of the screw 64 can be taken on the second folding portion 48. According to this preferred embodiment, each screw 64 is thus intended to be inserted respectively in one of the first lights oblong 56, in the wall 30 33345 and in one of the second oblong slots 60, as will be detailed later. In the particular embodiment illustrated in Figures 2 to 12, each receiving element 26 is formed of a longitudinal slide 5 extending substantially perpendicularly to one of the vertical uprights 34. Thus, each longitudinal slide 26 s extends substantially perpendicular to the wall 12 when the frame 14 is fixed to the wall 12. According to this particular embodiment of FIGS. 2 to 12, each locking element 30A, 30B is formed of a notch provided in one of the receiving rails 26. Thus, each upper locking member 30A is formed of an upper notch, and each lower locking member 30B is formed of a lower notch. In the embodiment of FIGS. 2 to 12, each locking element 32A, 32B is formed of a metal tab. Thus, each upper locking member 32A is formed of an upper metal tab, and each lower locking member 32B is formed of a lower metal tab. As shown in FIGS. 4, 8, 9 and 11, each metal tab 32A, 32B comprises a first portion 70 fixed to the frame 14 and a second portion 72 forming a curved elastic finger, intended to be snapped around one end. free of one of the guide members 28A, 28B, for the locking in position of the tray 16 on the frame 14. [0065] The tray 16 comprises a bottom 74 and two side walls 76 25 extending substantially perpendicular to the bottom 74. In the preferred embodiment illustrated in Figures 5 to 12, the tray 16 has a substantially rectangular longitudinal section. According to this preferred embodiment, the largest dimension of the longitudinal section of the tray 16 is smaller than the largest dimension of the frame 3033345 20 14. This facilitates the installation of the tray 16 on the frame 14, inside of the bay 10, when electrical sleeves 88 extend through the bay 10 in a direction from below. Preferably, the tray 16 further comprises at least one grip handle 78. Preferably, the tray 16 further comprises at least one longitudinal chute 80. Alternatively or additionally, the tray 16 further comprises at least two fixing rails, for example metal or plastic. In the preferred embodiment illustrated in FIGS. 5 to 12, the tray 16 comprises four gripping handles 78 and two longitudinal chutes 80. Each side wall 76 is provided on its outer surface with at least one fastener member. guide 28A, 28B. In the embodiment of Figures 5 to 12, each side wall 76 is provided on its outer surface with an upper guide member 28A and a lower guide member 28B. Each side wall 76 is thus provided on its outer surface with two guide members 28A, 28B. Each guide member 28A, 28B is adapted to cooperate with one of the receiving elements 26 of the frame 14, for the longitudinal translation guide of the tray 16 relative to the frame 14. Each upper guide member 28A, 20 respectively each lower guide member 28B, is adapted to cooperate with an upper locking element 30A, respectively with a lower blocking element 30B, of the frame 14, for locking in longitudinal translation of the tray 16 relative to the frame 14. Preferably, each upper guide member 28A each lower guide member 28B, respectively, is further adapted to cooperate with an upper locking element 32A, respectively with a lower locking element 32B, of the frame 14, for the locking in position of the tray 16 on the frame 14. In the particular embodiment of FIGS. 5 to 12, each guide member 28A, 28B comprises an axis 84A, 84B and a 3033345 21 ep 85A, 85B. Each axis 84A, 84B protrudes from the outer surface of the associated side wall 76, substantially perpendicular to a plane defined by this side wall 76. Each axis 84A, 84B is arranged near an upper corner 86 of the side wall 5 76 from which it protrudes. Each axis 84A, 84B has a first portion 87 extending between the side wall 76 from which it projects and the associated holding shoulder 85A, 85B, and a second portion 89 corresponding to a free end of the axis 84A, 84B. In the particular exemplary embodiment of FIGS. 5 to 12, each side wall 76 thus comprises two axes 84A, 84B on its outer surface, and each longitudinal slideway 26 is able to cooperate with each of the axes 84A, 84B of FIG. a same side wall 76, for guiding longitudinal translation of the tray 16 relative to the frame 14. According to this advantageous embodiment, each notch 30A, 30B forms a pivoting means of the tray 16 relative to the frame 14 when the first portion 87 of one of the axes 84A, 84B of the tray 16 is inserted into the notch 30A, 30B, as detailed below. According to this advantageous embodiment, the second portion 72 of each metal tab 32A, 32B forms a pivoting means of the tray 16 relative to the frame 14 20 when the free end 89 of one of the axes 84A, 84B of the tray 16 is snapped into the second portion 72, as detailed later. The pivot axis AA 'defined by each of the upper slots 30A coincides with the pivot axis defined by each of the upper metal tabs 32A, as illustrated in FIGS. 7 and 8. In addition, the pivot axis BB defined by each of the lower notches 30B coincides with the axis of pivoting defined by each of the lower metal tabs 32B, as illustrated in FIG. 7. Each handle 78 is for example formed of a recess formed in FIG. one of the side walls 76, as illustrated in Figures 5, 7 and 10. In the embodiment of Figures 5 to 12, each recess 78 is for example oblong. Each handle 3033345 22 grip can receive the fingers of an installer, allowing an easy and intuitive handling of the tray 16. Each longitudinal chute 80 extends substantially parallel to the largest dimension of the tray 16, as shown on Figures 5 and 7. Each longitudinal chute 80 is configured to allow attachment by clipping or direct screwing of at least one element on the chute 80, such an element is not shown in the figures for the sake of clarity. Such an element, intended to be clipped or screwed onto one or more troughs 80 inside the tray 16 and the bay 10 when the tray 16 is recessed in the rack 10, is for example a module type electric box. The installation method of the assembly 1 on the wall 12, around the bay 10, will now be described with reference to Figures 1 to 12. It is assumed that initially the bay 10 is already arranged in the wall 12. To do this, an installer has, for example, previously positioned the frame 14 on the wall 12, at the desired location for the bay 10, and then provided for example with a pen or a wood pencil and a level. With the aid of the pen or the wood pencil, the installer, after positioning the level frame, materialized, by writing on the wall 12 through the openings 54, the location of the bay 10 to be cut.

The installer then proceeded to cut the bay 10 itself, the dimensions of the bay 10 then corresponding to those of the frame 14. [0073] It is also assumed that at least one electrical sheath 88 extends longitudinally to through the bay 10, from an interior space delimited by the wall 12 towards the outside of the wall 12. In the embodiment of FIGS. 2 to 12, three electrical ducts 88 extend through the bay 10, through example in a sense from below. Each electrical sheath 88 comprises at least one electrical cable and / or at least one electrical wire. In the course of an initial step, the installer equips himself with the assembly 1. In particular, the installer first acquires the frame 14. [0075] During a next step, represented in FIG. 2, the installer positions the central opening 24 of the frame 14 opposite the bay 10 5 and plates the frame 14 on the wall 12, around the bay 10, so that each electric sleeve 88 is extends through the bay 10 and through the central opening 24 of the frame 14. [0076] In a next step, the installer fixes the frame 14 on the wall 12, around the bay 10. 10 [0077 In the embodiment of Figures 2 to 4, the step of fixing the frame 14 on the wall 12 comprises a first substep, shown in Figure 3, during which the installer folds the first and second fold portions 44, 48 of each bracket 40 around the associated first weakened folding zone 46, until the first folding portion 44 comes to extend facing one of the side surfaces 23 of the wall 12, inside the bay 10, at a non-zero distance from the surface 23. More specifically, the installer folds the first and second foldable portions 44, 48 of each bracket 40 until the first foldable portion 44 comes into contact with the associated stopper 62, in a position in which the first foldable portion 44 is inclined at an angle an angle substantially equal to 90 degrees relative to the portion 42. According to this embodiment, the fixing step comprises a following substep during which the installer folds the second folding portion 48 of each leg fastening 40 around the second weakened folding zone 50 associated until the second folding portion 48 comes to rest on the inner surface 22A of the wall 12. The inner surface 22A of the p aroi 12 thus forms an end stop for the second folding portion 48. At the end of this flap sub-step 30 of each second folding portion 48, each second oblong slot 60 is opposite the one of the first oblong slots 56, and the frame 14 is pre-held on the wall 12, by wedging the wall 12 between the underside of the frame 14 and each fixing lug 40. [0079] According to this exemplary embodiment, the fixing step comprises a following sub-step during which the installer positions the frame 14 to the desired position, by angular pivoting of the frame 14 in the bay 10. To do this, the installer enters the frame 14 pre -maintenu 10 on the wall 12, and rotates the frame 14 to the desired position using the clearance left between each first folding portion 44 and one of the side surfaces 23 of the wall 12. Thus, the plumb of the frame 14 can be easily and accurately adjusted while ensuring a pre-maintenance of the frame 14 thanks to the fixing lugs 40. In the variant in which the fastening means 38 do not comprise a fastening tab (s) 40, the fixing step comprises not the three previous substeps. The fixing step comprises a following sub-step, shown in Figure 4, during which the installer positions each screw 64 in one of the first oblong slots 56 of the frame 14, and then screws into the wall 12 each of the screws 64 thus positioned. In the embodiment of FIGS. 2 to 4, the fixing step comprises a subsequent sub-step during which the installer screws each screw 64 into the second oblong slot 60 extending in with respect to the first associated oblong slot 56. At the end of this screwing step, the head of each screw 64 comes into contact with the upper surface of the first associated oblong slot 56. The threads of each screw 64, taken on one of the second foldable portions 48, then exert traction on the associated bracket 40. A firm attachment of the frame 14 to the wall 12 is then obtained. In the case where the wall 12 is plaster, the anchoring force of the screw 64 in the second folding portion 48 is greater than the anchoring force of the screw 64 in the plaster wall 12. The plaster then goes crumble before the screwing torque required to plating the bracket 40 behind the wall 12 is reached. When the wall 12 is made of a less friable material, such as wood for example, it is preferable that the installer first drill a hole in the wall 12, before the step of screwing screws. In the variant according to which the fastening means 38 do not comprise a fastening tab (s) 40, the fixing step does not comprise the preceding substep, and the screwing of each screw 64 is carried out by direct screwing into the wall 12. [0084] In a subsequent step shown in FIGS. 5 and 6, the installer equips the tray 16 and positions the tray 16 in the central opening 24 of the frame 14 and in the bay 10, so that the first portions 87 of the two upper guide axes 84A come into the position of cooperation with the receiving rails 26, and that each electrical sheath 88 extends opposite the bottom 74 of the tray 16, on the side of the side walls 76, from the interior space delimited by the wall 12 towards the outside of the wall 12. In the case not shown, according to which the electrical ducts 88 extend through the bay 10 according to a meaning from the top, the free ends of the sheath Electrical sockets 88 are positioned on the bottom 74 of the tray 16. [0085] In a subsequent step, the installer moves the tray 16 in longitudinal translation relative to the frame 14, by guiding the two upper guide pins 84A. on the receiving rails 26, until the first portion 87 of each upper guide shaft 84A is inserted in an upper notch 30A, thus blocking the longitudinal translation of the tray 16. In this position, the retaining shoulders 30 85A prevent any horizontal displacement of the tray 16 relative to the frame 3033345 26 14. In the preferred embodiment of Figures 2 to 12 according to which the frame 14 further comprises two upper locking metal tabs 32A, the installer positions, to At the end of this step, each upper guide pin 84A in the second portion 72 of one of the upper metal tabs 32A, as illustrated in FIGS. 8, 9 and 12. the installer snaps the free end 89 of each upper guide pin 84A into the second portion 72 of one of the upper metal tabs 32A. In a next step shown in Figures 10 to 12, the installer rotates the tray 16 relative to the frame 14, about the axis A-A ', so as to position at least one of the two lower guide pins 84B in the or one of the remaining notches 30B, as shown in Figure 11. More particularly, the installer rotates the tray 16 in the pivoting means formed by the upper notches 30A.

In the exemplary embodiment of Figures 2 to 12, the installer rotates the tray 16 in the upper notches 30A and in the upper metal tabs 32A so as to position the first portions 87 of the two lower guide pins 84 in the two lower notches 30B. In the preferred embodiment of FIGS. 2 to 12 in which the frame 14 further comprises two lower locking metal tabs 32B, the installer positions, at the end of this step, each lower guide pin 84B in the second portion 72 of one of the lower metal tabs 32B, as illustrated in FIG. 11. More specifically, the installer snaps the free end 89 of each lower guide pin 84B into the second portion 72 of one of the metal tabs lower 32B. The tray 16 is then locked in position on the frame 14. During a final stage shown in FIG. 1, the installer mounts the panel 18 on the frame 14, for example by means of the two removable hinges. 20. Since the panel 18 and the hinges 20 are removable, and the frame 14 is already level, the panel 18 can advantageously be mounted on the frame 14 without any tools and without having to adjust the plumb of the panel 18. In a variant not shown, the longitudinal translation of the tray 16 relative to the frame 14 and pivoting 5 of the tray 16 relative to the frame 14 are performed by guiding at first the lower guide pins 84B on the receiving rails 26, up to the lower metal notches and tabs 30B, 32B, then rotating the tray about the axis BB 'so as to position the two upper guide pins 84A in the notches and 10 upper metal tabs 30A, 32A. It is thus conceived that tray 16 can be easily installed within the bay 10, regardless of the configuration of electrical connection sleeves 88 extending through the bay 10, while providing a more precise and more efficient installation. . [0090] FIGS. 13 to 15 illustrate a second embodiment of the invention for which the elements similar to the first embodiment, described above, are identified by identical references, and are therefore not described again. A tray 90 according to a second embodiment of the invention 20 is shown in Figures 13 and 14. In this embodiment, the tray 90 comprises four gripping handles 78. The tray 90 does not comprises more longitudinal chutes 80 but comprises at least two fastening rails 91, for example four fastening rails 91 in the illustrative example of FIG. 13.

The tray 90 further comprises at least one third lateral wall 92, extending perpendicularly to the bottom 74. In the embodiment of FIG. 13, the tray 90 comprises a single third lateral wall 92. As a variant, not shown, the third side wall 92 may be a retractable wall and thus form a perforation plate that can be installed 3033345 28 on the tray 90 once it mounted on the frame 14 and recessed in the bay 10. [0093] Each rail 91 is fixed on the bottom 74 of the tray 90. Each rail 91 is for example a longitudinal rail extending substantially parallel to the largest dimension of the tray 90, as shown in Figure 13. Each rail 91 is for example metal or in plastic. According to this particular embodiment of the tray 90, each guide member 28A, 28B comprises a lug 94A, 94B. Each lug 94A, 94B protrudes from the outer surface of the associated side wall 76, substantially perpendicular to a plane defined by this side wall 76, as illustrated in FIG. 14. Each lug 94A, 94B is arranged close to a upper corner 86 of the side wall 76 from which it projects. As a variant not shown, each guide member 28A, 28B could comprise an axis 84A, 84B associated with a shoulder 85A, 85B, similarly to the first embodiment. Part of a frame 96 according to a second embodiment of the invention is shown in FIG. 15. Unlike the first embodiment, each locking element 32A, 32B according to this second embodiment embodiment is formed of an oblong slot formed in one of the receiving elements 26, for example in a receiving rail according to a particular embodiment. Thus, each upper locking member 32A is formed with an upper oblong slot, and each lower locking member 32B is formed with a lower oblong slot. Each oblong slot is intended to receive a free end of one of the guide members 28A, 28B, for the locking in position of the tray 90 on the frame 96. In the embodiment of Figure 15, each oblong slot opens in an associated locking slot 30A. The operation of the tray 90 and the frame 96 according to the second embodiment, and the method of installation of the assembly 1 comprising this tray 90 and this frame 96 being identical to those of the first embodiment, these will not be described in more detail. Although the frame 96 according to the second embodiment is presented in combination with the tray 90 according to the second embodiment, the frame 96 is not limited to this sole use. In particular, the frame 96 according to the second embodiment can also be used in combination with the tray 16 according to the first embodiment, within the assembly 1. [0099] The tray and the method of installation of the assembly comprising this tray according to the invention have several advantages: - the tray according to the invention comprising only two irremovable side walls, the positioning of the electrical sheaths relatively 15 to the tray is facilitated during the insertion of the tray in the bay ; - Thanks to the cooperation between the tray guide members and the locking elements on the frame, the tray is locked in position on the frame without requiring a tool at the end of the race; the container according to the present invention allows an assembly around the frame, which thus becomes the first piece to be fixed on the wall; the frame being lighter and more maneuverable than the tray, the assembly operation of the assembly is facilitated; the container according to the present invention being symmetrical, it does not require any particular orientation when it is positioned; 25 - at the time of installation of the tray on the frame, part of the weight of the tray is carried by the frame, which improves the ease and accuracy of installation tray; 3033345 30 - thanks to the fact that the fixing brackets are integrated with the vertical uprights and / or the horizontal crosspieces of the frame, no independent accessory other than screws is necessary to secure the frame to the wall. This advantageously reduces costs; due to the weakened first and second fold areas and the material for producing each fastening tab, no tools are required to fold the first and second foldable portions respectively around the first and second weakened fold zones. These bends can be done manually by the installer, which helps to facilitate the attachment of the frame on the wall. The invention is described in the foregoing by way of example. It is understood that the skilled person is able to realize different embodiments of the invention without departing from the scope of the invention.

Claims (15)

REVENDICATIONS1. Tray (16; 90) for mounting on a frame (14; 96) fixed to a wall (12) around a bay (10) in the wall (12), the tray (16; in addition to being recessed in the bay (10), the trough (16; 90) comprising a bottom (74) and two side walls (76) extending substantially perpendicular to the bottom (74), wherein each side wall (76) ) is provided on its outer surface with at least one guide member (28A, 28B), each guide member (28A, 28B) being adapted to cooperate with a receiving element (26) on the frame (14; 96) for guiding the tray (16; 90) longitudinally relative to the frame (14; 96), and with a locking member (30A, 30B) on the frame (14; 96) to lock the tray (16; 90) in longitudinal translation relative to the frame (14; 96). 2. Tray (16; 90) according to claim 1, characterized in that it further comprises at least one gripping handle (78), each handle (78) being formed of a recess formed in one of the side walls ( 76). 3. Tray (16; 90) according to claim 1 or 2, characterized in that it further comprises at least two rails (91) fixed on the bottom (74) of the tray (16; 90). 4. Tray (16; 90) according to any one of the preceding claims, characterized in that it further comprises at least one longitudinal chute (80) attached to the tray, the longitudinal chute (80) being configured to allow a fixing by clipping or screwing at least one element on the chute (80). 3033345 32 5. Tray (16; 90) according to any one of the preceding claims, characterized in that it has a substantially rectangular longitudinal section in section, and in that the largest dimension of said substantially rectangular section is less than the most large frame size (14; 96). 6. Tray (90) according to any one of the preceding claims, characterized in that it further comprises at least a third retractable side wall, the third retractable wall extending substantially perpendicularly to the bottom (74). 7. Tray (16; 90) according to any one of the preceding claims, characterized in that each guide member (28A, 28B) comprises an axis (84A, 84B) projecting from the outer surface of the side wall ( 76), substantially perpendicular to a plane defined by this side wall (76), each axis (84A, 84B) being arranged near an upper corner (86) of said side wall (76). 8. Assembly (1) intended to be mounted in a bay (10) formed in a wall (12), characterized in that it comprises: - a container (16; 90) according to any one of the preceding claims, the tray (16; 90) being intended to be recessed in the bay (10), - an opening frame (14; 96) intended to be fixed on the wall (12) 25 around the bay (10) formed in the wall (12), the frame (14; 96) being provided with a central opening (24) and comprising at least two elements (26) for receiving a guide member (28A, 28B) and at least two elements ( 30A, 30B) for locking a guide member (28A, 28B), each receiving member (26) being adapted to cooperate with at least one of the guide members (28A, 28B) of the container (16; for guiding longitudinal translation of the tray (16; 90) relative to the frame (14; 96), each locking element (30A, 3033345 33 30B) being adapted to cooperate with one of the guide members (28A, 28B) of the tray (16; 90) for locking in longitudinal translation of the tray (16; 90) relative to the frame (14; 96). 5 9. Assembly (1) according to claim 8, characterized in that the frame (14; 96) further comprises at least two elements (32A, 32B) for locking a guide member (28A, 28B), each element locking device (32A, 32B) being adapted to cooperate with one of the guide members (28A, 28B) of the container (16; 90) for locking the tray (16; 90) on the frame (14; 96) in position; . 10. Assembly (1) according to claim 9, characterized in that each locking element (32A, 32B) is formed of a metal tab comprising a first portion (70) fixed on the frame (14) and a second portion (72) forming a curved elastic finger intended to be snapped around a free end of one of the guide members (28A, 28B), for locking the tray (16; 90) in position on the frame (14). 20 11. Assembly (1) according to claim 9, characterized in that each locking element (32A, 32B) is formed of an oblong slot formed in one of the receiving elements (26), each oblong slot being intended to receive a free end of one of the guide members (28A, 28B) for locking the tray (16; 90) in position on the frame (96). 12. Assembly (1) according to one of claims 8 to 11, characterized in that it further comprises a panel (18) mounted on the frame (14; 96), the panel (18) being movable relative to the frame (14; 96), between a closed position in which the panel (18) prevents access to the interior of the tray (16; 90), and an open position in which the panel (18) allows access to the interior of the bin (16; 90). 3033345 34 13. Assembly (1) according to one of claims 8 to 12 when the tray (16; 90) is according to claim 7, characterized in that each side wall (76) of the tray (16; 90) is provided on its outer surface of two axes (84A, 84B), in that the frame (14; 96) comprises two elements (26) for receiving a guide member, each receiving member (26) being formed of a slideway longitudinal extending substantially perpendicular to the wall (12) when the frame (14; 96) is fixed on the wall (12) and being adapted to cooperate with each of the axes (84A, 84B) of the same side wall ( 76) of the container (16; 90), and in that the frame (14; 96) comprises at least three elements (30A, 30B) for locking a guide member (28A, 28B), each locking element ( 30A, 30B) being formed of a notch in one of the receiving rails (26), each notch further forming a means for pivoting the tray (16; 90) relative to the frame (14; 96) when one of the axes (84A, 84B) of the tray (16; 90) is inserted into the notch. 14. A method of installing an assembly (1) on a wall (12) provided with an array (10), at least one electrical sheath (88) extending longitudinally through the bay (10), from an interior space delimited by the wall (12) towards the outside of the wall (12), the method comprising the following steps: - providing an assembly (1) according to claim 13, the assembly (1) further comprising a panel (18), - position the central opening (24) of the frame (14; 96) facing the bay (10) in the wall (12) and press the frame (14; 96) onto the wall (12). ), so that the or each electrical sheath (88) extends through the bay (10) and through the central opening (24) of the frame (14; 96), - fix the frame (14); 96) on the wall (12), around the bay (10), 3033345 - position the trough (16; 90) in the central opening (24) of the frame (14; 96) and in the bay (10) , so that two upper guide axes (84A), each belonging to a side wall (76) separate from the tray (16; 90), come into a position of cooperation with the five receiving rails (26), and that the or each electrical sheath (88) extends opposite the bottom (74) of the tray (16; side walls (76) of the container (16; 90), from the interior space delimited by the wall (12) towards the outside of the wall (12), - moving the container (16; 90) in longitudinal translation by to the frame (14; 96) by guiding the two upper guide pins (84A) on the receiving rails (26) until each upper guide pin (84A) fits into a top notch (30A), thereby blocking the longitudinal translation of the tray (16; 90), - pivoting the tray (16; 90) relative to the frame (14; 96) so as to position at least one of the two guide pins lower (84B) in the one or more of the remaining notches (30B), and - mounting the panel (18) on the frame (14; 96). 15. Installation method according to claim 14, the wall (12) having an inner surface (22A) and an outer surface (22B) separated by a distance corresponding to the thickness of the wall (12), characterized in that the frame (14; 96) comprises: - two vertical uprights (34) and two horizontal crosspieces (36), the two uprights (34) and the two horizontal crosspieces (36) defining the central opening (24) - means (38) for fixing the frame (14; 96) to the wall (12), comprising at least one screw (64) and at least one fixing lug (40) projecting from a portion (42) of a vertical upright (34) or a horizontal crossbar (36) in the central opening (24), the or each fastening tab (40) comprising a first folding portion (44) connected to said portion (42); ) via a first weakened folding zone (46), and a second folding portion (48) connected to the first folding portion (44) via a second weakened folding zone (50), the first folding portion (44) having a length greater than the thickness of the wall (12) and being intended to extend facing one of the lateral surfaces ( 23) of the wall (12) delimiting in part the bay (10), the second folding portion (48) being intended to bear on the inner surface (22A) of the wall (12), said portion (42) of vertical upright (34) or horizontal cross member (36) comprising a first oblong slot (56), said portion (42) and the first folding portion (44) being configured such that a non-zero distance separates the first folding portion (44) of the side surface (23) of the wall (12) when the frame (14; 96) is fixed to the wall (12), the second folding portion (48) being provided with a second oblong slot (60), the second oblong slot (60) being arranged to extend -vis the first oblong slot (56) when the second folding portion (48) bears on the inner surface (22A) of the wall (12), and in that the step of fixing the frame (14; ) on the wall (12) comprises the following steps: - folding the first and second folding portions (44, 48) of the or each fastening tab (40) by folding around the first weakened folding zone (46), until said first folding portion (44) extends facing one of the side surfaces (23) of the wall (12), within the bay (10), at a distance no none of this surface (23), - fold down the second folding portion (48) of the or each fastening tab (40) by folding around the second folding zone weakened (50), until said second folding portion (48) bears against the inner surface (22A) of the wall (12), - positioning the frame (14; 96) at the desired position, by angular pivoting of the frame (14; 96) in the bay (10), 3033345 37 - positioning the or each screw (64) in the one or more oblong light (s) (s) ( s) (56), - and screw the or each screw (64) in the wall (12) and then in the one or one oblong second light (s) (60) extending opposite the The first associated oblong slot (56).