RU2797997C2 - Pre-manufactured support for rack-mounted electrical device and electrical device containing such support - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to the electrical devices mounted in a rack. The prefabricated support (2A, 2B) of the electrical device contains a plate (6A, 6B), an electrical connector (8A, 8B), electrical conductors (51, 52, 53), each of which contains a first end (55) and a second end (54), and a one-piece housing forming a receiving socket (70) designed to receive an electrical switching device (200), and limiting the passage in which the electrical conductors are placed. The housing contains a separating wall (100A, 100B). Said wall and at least one side of the plate form the side of the support, containing the first fasteners (91A, 91B) and the second fasteners (92A, 92B), each second fastener has a shape complementary with the first fastener, each first element and each second element is configured to engage, respectively, with another second element and another first element.

EFFECT: simplifying the design of an electrical device due to the fact that its design is modular.

10 cl, 7 dwg

Description

The present invention relates to a prefabricated support for a rack-mountable electrical device and a rack-mountable electrical device comprising such a support.

Rack-mountable electrical devices are known, which typically take the form of drawer units designed to be mounted in a suitable slot, or rack, of an electrical cabinet. Patent FR 2776465 B1 describes an example of a rack-mountable electrical device for an electrical distribution plant. This electrical device comprises one or more electrical devices, such as electrical switching devices, mounted on a panel serving as a support.

One disadvantage of such prior art devices is that they must be custom made for the application for which they are intended.

Therefore, there is a need for a similar rack-mountable electrical device that has a simplified design.

This is a problem that the invention solves more specifically by providing a new prefabricated support for an electrical rack mounted device.

To this end, the invention relates to a prefabricated support for a rack-mounted electrical device, comprising a plate, a one-piece housing mounted on the plate, an electrical connector located on the rear side of the prefabricated support, and preformed electrical conductors, each of which contains a first end and the second end, wherein the housing forms on the front side of the support a receiving socket designed to receive an electrical switching device, the housing also defines a passage in which electrical conductors are placed, each first end of each electrical conductor is connected to an electrical connector, and each second end of each electrical conductor extends inside receiving socket, the body contains an electrically insulating separating wall extending at right angles from the edge of the plate, said wall and at least one side of the plate form the side of the support, containing at least one first fastener and at least one second fastener, each second the fastening element has a shape that mates with the first fastening element, each first element and each second element are adapted to engage, respectively, with another second element and another first element.

By means of the invention, such a support allows the construction of electrical devices in a modular manner, involving a limited number of prefabricated parts having predetermined dimensions. Such prefabricated parts offer the advantage of being able to produce them in large quantities at relatively low manufacturing costs.

According to advantageous but not mandatory aspects of the invention, such a support may combine one or more of the following features, taken in any technically acceptable combination:

- the first fastening element is made as a single part with the body, and the second fastening element is made as a single part with the plate.

– body and plate are made of electrically insulating material.

- the first and second elements are made with the possibility of engagement, respectively, with another second element and another first element.

According to another aspect, another object of the invention is an electrical device containing at least one prefabricated support, as described previously, and an electrical switching device located at least partially in the receiving socket of said at least one prefabricated support and electrically connected to the second the end of the electrical conductors of said at least one prefabricated support.

According to advantageous but not mandatory aspects of the invention, such an electrical device may combine one or more of the following features, taken in any technically acceptable combination:

– the device contains a single prefabricated support, as previously defined; an additional, electrically insulating partition attached to the dividing wall and containing the first fastening element and the second fastening element, which are similar, respectively, to the first and second elements of the said support, the first element and the second fastening element of the electrically insulating partition are joined, respectively, with the second element and the first element of the dividing wall, so that to attach the partition to the partition wall.

- the device contains the first prefabricated support, as previously defined; a second prefabricated support, as previously defined, identical or similar to the first prefabricated support, wherein the second support is attached to the first support, the first element of the first support is engaged with the second element of the second support, and the second element of the first support is engaged with the first element of the second support, and the corresponding the separating walls of the two supports are placed side by side and in contact with each other, thus defining the contact surface.

- the device further comprises a cap attached to the first and second supports on the front side of the device.

- the device further comprises two gripping handles, each handle being respectively attached to one of said supports, each handle protruding relative to the front side of each support, the handles being identical and arranged symmetrically to each other with respect to the same connecting plane formed by the contact surface between the two supports .

- at least one of said handles contains a mechanism for indicating the position of the electrical device in the rack, and this handle is equipped with a manual control lever for this mechanism.

The invention will be better understood and its other advantages will become more apparent from the following description of several embodiments of the invention in accordance with its principle, provided solely by way of example and with reference to the accompanying drawings, in which:

Fig. 1 is an isometric view of an electrical device according to a first embodiment of the invention;

Fig. 2 is an exploded view of the electrical device of FIG. 1;

Fig. 3 is an isometric view of a prefabricated support used in the electrical device of FIG. 1 and 2;

Fig. 4 is an isometric view of the prefabricated support from another angle;

FIG. 5 is a partially sectional isometric view of the electrical device of FIG. 1;

Fig. 6 is an isometric view of an electrical device according to the second embodiment; And

Fig. 7 is an isometric view of an electrical device according to the third embodiment.

Fig. 1 and 2 represent an electrical rack-mountable device 1.

"Rack-mountable" is understood to mean here that the electrical device 1 can be reversibly inserted into or removed from an electrical installation such as an electrical cabinet (or "rack") containing racks forming receptacles.

For example, the electrical device 1 can be inserted into or removed from the rack by translational movement along the longitudinal axis X, as in a drawer.

According to the examples, in this way, the electrical device 1 can be displaced between the connected position, in which it is electrically connected to the power conductor of the electrical installation, and the disconnected position, in which it is isolated from said conductor of the electrical installation.

According to sub-options, the electrical device 1 may also be in an intermediate position between the connected and disconnected positions, called the test position. In this intermediate position, the device 1 is isolated from said power conductor, being connected to the low-voltage information and/or control line of the electrical installation.

As an illustrative example, an electrical installation may be an electrical distribution installation including power electrical conductors, such as busbars, for distributing electrical current.

For example, the strength of the electric current flowing in the power electrical conductors is greater than or equal to 50 A, or greater than or equal to 100 A.

As will be clear from reading the following description illustrated in FIG. 1 and 2, the device 1 according to the first embodiment comprises, among other things, a first prefabricated support 2A and a second prefabricated support 2B, which are preferably similar or identical, indicated as a whole by reference numeral 2.

As will be clear from reading the following description, the supports 2A and 2B are attached to each other and together form the armature of the device 1.

The apparatus 1 also includes an electrical apparatus 200, described below, which communicates with prefabricated supports 2A and 2B.

The apparatus 200 is intended to be connected to the electrical installation when the device 1 is in the connected position. For example, apparatus 200 is an electrical switching and/or protective apparatus, such as a circuit breaker, or a contactor, or a disconnector, or relay, or other examples.

For example, apparatus 200 includes electrical connection input pads 201 and electrical connection output pads 202.

Apparatus 200 may also include, from the front, a control element such as a lever or button, or an indicator such as an indicator lamp.

The prefabricated support 2, shown separately in FIG. 3 and 4 comprises a one-piece body 4 and a rigid plate 6 which is mounted on the body 4 to serve as a lid.

The body 4 and the plate 6 are made, for example, of an electrically insulating material, such as a molded or thermoset polymer, such as polyamide. The material or materials used for the plate 6 and for the housing 4 may be identical to each other or different.

Support 2 is called "prefabricated" because it is already assembled. In particular, the support 2, due to its shape and its overall design, can serve as the main building block for constructing the device 1.

The support 2 thus comprises a front side 71, a back side 72 parallel to the side 71, and a side side 73 which is at right angles to the sides 71 and 72.

The support 2 contains an electrical connector 8, or power connector, here mounted on a plate 6 on the rear side 72. The connector 8 allows the device 1 to be connected to the electrical installation when the device 1 is installed in the connected position.

For example, an electrical connector 8 includes a base 81 containing electrically conductive clips 82. In the connected position, each clip 82 clamps an electrical conductor of the electrical installation, allowing current to flow to the device 1. As a sub-option, the connector 8 can be made differently.

In practice, when the device 1 is intended for use in a multi-phase electrical installation, the connector 8 contains at least one terminal 82 for each phase.

The housing 4 forms a receptacle 70, here located on the front side 71. The receptacle 70 is intended to receive an electrical switching device 200, for example, in such a way that the device 200 is at least partially located in the receptacle 70.

The plate 6 is predominantly made conformal so that on the front side 71 the edges of the plate 6 are aligned with the edges of the body 4, forming a continuation of the socket 70.

Device 2 also includes electrical conductors 51, 52 and 53 for connecting connector 8 to apparatus 200. Electrical conductors 51, 52 and 53, for example, are located, and more specifically fixed, within passages 58 delimited within housing 4, as will be more specifically clarified. from FIG. 5.

In general, the conductors 51, 52, 53 are preferably preformed so as to have predetermined shapes and sizes. The conductors 51, 52, 53 are made of a conductive material such as copper and are rigid.

Each conductor 51, 52 or 53 here refers to one phase of the multi-phase current. In this example, there are three electrical conductors 51, 52 and 53 for carrying three-phase current, although as a sub-option this number may be different depending on the nature of the electrical installation.

The conductors 51, 52 and 53 are, for example, solid or hollow tubular busbars, each of which contains straight sections characteristic of each conductor 51, 52 and 53, the straight sections continuing with curved sections characteristic of each conductor 51, 52 and 53. Each conductor 51, 52 and 53 extends between the first end 55 and the second end 54.

First ends 55 of each electrical conductor 51, 52, 53 are electrically connected to connector 8. For example, each end 55 is electrically connected to terminal 82 of connector 8 via conductive plate 56, here by means of a screw and bolt. To ensure satisfactory contact between each first end 55 and each conductive plate 56, the first end 55 of each conductor 51, 52 and 53 is, for example, a flat shape.

Each electrical conductor 51, 52 and 53 extends into a receptacle 70 on the front side 71 of the support 2 as seen in FIG. 2. More specifically, the second ends 54 extend into the socket 70 protruding from the rest of the housing 4 so as to be able to be connected to the electrical apparatus 200.

For example, ends 54 have here a flattened head to facilitate connection of ends 54 to apparatus 200. However, it will be appreciated that the shape of ends 54 may be adapted to the nature of electrical apparatus 200.

As illustrated in FIG. 5, passages 58 comprise baffles 59 which electrically isolate conductors 51, 52 and 53 in pairs, at least at their ends 55 in the area of connection with connector 8. Preferably, baffles 59 are integral with the rest of housing 4.

Referring to FIG. 3 and 4, the housing 4 comprises an electrically insulating separating wall 100. Here, the wall 100 extends at right angles to the plate 6 from the edge of the plate 6. The wall 100 and at least one side of the plate 6 together form a side face 73 of the support 2. In other words, the side face 73 here is formed by closing the dividing wall 100 with at least one side of the plate 6.

For example, one or more grooves are provided in wall 100 to allow passage of a tool such as a screwdriver, thereby facilitating the placement and tightening of one or more members 64 such as screws that secure plate 6 to housing 4.

Particularly advantageously, according to embodiments of the invention, the support 2 is made conformal with the possibility of pairing with another similar or identical support 2.

To do this, the support 2 comprises at least one first fastening element 91 and at least one second fastening element 92 formed here on the lateral side 73. Each second fastening element 92 has a shape complementary to the shape of each first fastening element 91.

Each first element 91 is thus adapted to be engaged with or nested in a corresponding second element 92, for example carried by another housing 2. In this way, the fasteners 91 and 92 form an assembly system, for example of the tongue and groove type, allowing the housing to be secured 2 by interfacing with a corresponding structure carrying one or more first elements 91 and/or second elements 92.

In practice, the side wall 73 comprises several first elements 91 and several second elements 92. In this case, the number of first elements 91 is identical to the number of second elements 92.

In the illustrated embodiments, the housing 4 comprises two first fasteners 91 and the plate 6 comprises two second fasteners 92. The element or elements 91 are integral with the housing 4 and the element or elements 92 are integral with the plate 6.

As a sub-option, the second element or elements 92 may be supported by the body 4, while the plate 6 contains the first fastening element or elements 91. According to other sub-options, each of the body 4 and the plate 6 may contain one or more first elements 91 and one or more second elements 92. Many other configurations are possible.

Preferably, the fasteners 91 are integral with the body 4 and the fasteners 92 are integral with the plate 6.

The elements 91 and 92 are provided with openings 65 here to allow the placement of fasteners 66 such as screws or rivets to restrict the movement of the elements 91 in the elements 92 when the element 91 is engaged in the element 92.

The first elements 91 are, for example, protrusions protruding from the side 73 of the wall 100, while the second elements 92 form hollow reliefs with a shape complementary to the protrusions of the elements 91.

The elements 91 and 92 thus allow the supports 2A and 2B to be assembled and fastened to form the reinforcement of the device 1.

Referring again to FIG. 1, 2 and 5, the location of supports 2A and 2B is now described in more detail. As previously explained, supports 2A and 2B are similar or identical and correspond to two copies of support 2 described above.

Hereinafter, those elements of supports 2A and 2B which are the same as those described generally for support 2 bear the same reference numerals, suffixed with "A" or "B" respectively. The description of the elements of the support 2 can also be transferred to them.

For example, reference numerals 4A and 4B designate the body 4 of supports 2A and 2B, respectively. Reference numerals 6A and 6B denote, respectively, the plate 6 of supports 2A and 2B. The same symbol applies in particular to the conductors 51, 52 and 53, to the separating wall 100 and to the fasteners 91 and 92.

In this example, supports 2A and 2B are identical. Therefore, the bodies 4A and 4B are identical to each other, and the plates 6A and 6B are identical to each other. Support 2B is, however, inversely symmetrical with respect to support 2A, ie support 2B is upside down with respect to support 2A. The respective sides 73 of each support 2A and 2B are in contact with each other.

In the assembled configuration of device 1, as seen in FIG. 1, supports 2A and 2B are connected to each other. In particular, elements 92A are inserted into elements 91B, while elements 91A are inserted into elements 92B. The walls 100A and 100B are then attached to each other and thus form a contact surface between the supports 2A and 2B. The contact surface is embodied by the connecting plane J, given as an illustration.

In this configuration, the apparatus 200 is received into the sockets 70 respectively formed by the supports 2A and 2B. Conductors 51A, 52A, and 53A connect the input pad 201 of apparatus 200 to connector 8A, and conductors 51B, 52B, and 53B connect output pad 202 of apparatus 200 to connector 8B. For example, the end 54A of each conductor 51A, 52A and 53A is aligned with the end 54B of the corresponding conductor 51B, 52B and 53B.

The plates 6A and 6B are staggered in height along the Z-axis, here vertical, the Z-axis here being at right angles to the plates 6A and 6B. In other words, in this example, plate 6A can be likened to a lid mounted on body 4A, while plate 6B serves as a bottom plate for body 4B. The height staggered arrangement between the plates 6A and 6B is such that the plates 6A and 6B do not touch each other. Like plates 6A and 6B, power connectors 8A and 8B are also staggered in Z-height.

In this assembled configuration of the apparatus 1, the electrically insulating partition walls 100A and 100B separate and insulate the conductors 51A, 52A, 53A of the tower 2A from the conductors 51B, 52B, 53B of the tower 2B. For example, connectors 8A and 8B form, respectively, the electrical input and output of device 1.

As illustrated in FIG. 1, device 1 further includes a protective cap 300.

The cap 300 is preferably attached to the first and second supports 2A and 2B on the front side 71. The cap 300 may be one piece, or it may be composed of several parts fastened to each other. The cap 300, for example, is made of a plastic material.

The protective cap 300 preferably includes a through window 301 allowing access to the front side of the apparatus 200, for example, to allow access to the control element of the apparatus 200. The cap 300 makes it possible, in particular, to protect the conductors 51, 52 and 53.

To handle the device 1, such as placing it in or removing it from a rack, the device 1 may also include two gripping handles 400 located on the front side 71.

Each handle 400, here, is respectively attached to one of the supports 2A or 2B. Each leg 400 protrudes from the front side 71 of each leg 2A or 2B.

Preferably, the handles 400 have identical shapes and are arranged symmetrically to each other, here on both sides of the connecting plane J.

As an illustrative and not necessarily limiting example, each handle 400 includes a gripping area 401 in the form of a vertically oriented cylinder. The handles 400 may be one piece, or otherwise be made up of several complementary parts.

According to optional embodiments, at least one of the two handles 400 includes a mechanism for indicating the position of the device 1 in the rack.

In the illustrated example, both handles 400 include this mechanism, but as a sub-option, only one of them is equipped with it. In this case, it is clear that the two handles of the device 1 are then not identical. This pointing mechanism is contained in the handle 400, for example.

For example, this mechanism is activated by the manual lever 402 for this mechanism, with the lever 402 located inside the handle 400. The lever 402 here protrudes from the grip surface 401 of the handle 400 so as to be accessible to the operator.

Now, for illustrative purposes, an example of the method of assembling the device 1 is given, in particular with reference to FIG. 2.

Initially, the apparatus 200 is connected to the ends 54A of the conductors 51A, 52A and 53A through the input connection pad 201, then the ends 54B of the conductors 51B, 52B and 53B are connected to the apparatus 200 through the output connection pad 202, bringing the support 2B to the support 2A.

Elements 91B then engage with elements 92A, and elements 91A engage with elements 92B. If appropriate, the fasteners 66 are placed in place in the holes 65, then tightened. The cap 300 is then placed and fixed on the front side 71, then the two handles 400 are positioned and fixed on one of the supports 2A or 2B, respectively.

Fig. 6 shows an electrical device 1' according to a second embodiment of the invention. The elements of this embodiment, which are similar to the first embodiment, bear the same reference numerals and are not described in detail since the description above can be transferred to them.

Optionally, the pedestal 2 includes at least one additional socket 75 for receiving an auxiliary electrical apparatus such as a contactor and an auxiliary connector 50 located on the rear side 72, here on the pedestal 2B.

For example, the auxiliary connector 50 allows the device 1', and in particular the auxiliary electrical apparatus, to be connected to a control line or to any other auxiliary electrical circuit of an electrical installation.

Depending on the implementations, the auxiliary connector 50 can be shifted in translation, here parallel to the X axis, between a position turned towards the back of the device 1' and beyond the latter, and a retracted position.

For example, the movable auxiliary connector 50 allows the intermediate position described previously to be realized.

In the connected position, the device 1' is connected both to the power conductor via its power connectors 8A and 8B, and to the control line via the auxiliary connector 50, which is then in the retracted position. In an intermediate position, called the test position, the auxiliary conductor 50 is in its deployed position, which allows it to remain connected to the control line while the power connectors 8A and 8B are disconnected from the power conductors.

According to other embodiments, which are not illustrated, the auxiliary connector 50 is fixedly mounted on the support 2 of the electrical device. In this case, the intermediate position is not realized and the auxiliary connector 50 is connected and disconnected at the same time as the power connector 8 or the connectors 8A and 8B.

Fig. 7 represents a third embodiment of the invention. The elements of this embodiment, which are similar to the first embodiment, bear the same reference numerals and are not described in detail since the description above can be transferred to them.

According to the third embodiment, the device 1 comprises only one single support 2, as previously described. The pedestal 2 may, however, be attached to an additional, electrically insulating barrier 600 external to the pedestal 2, forming an electrical device of a more reduced form. The additional partition wall 600 is then attached to the wall 100 of the support 2 by means of the fastening system described earlier.

The baffle 600 includes a first fastening element 91C, similar to the first element 91, and a second fastening element, similar to the second element 92, with the second baffle element 600 not visible in the drawings. Thus, in the assembled configuration, the first element 91C is engaged with the second element 92 of the wall 100, while the second element of the baffle 600 is engaged with the first element 91 of the wall 100. The baffle 600 allows the housing 4 of the support 2 to be closed. A properly formed assembly can be inserted as such into an electrical installation or coupled to another element to form another electrical device.

The above-described embodiments make it possible to construct a rack-mountable electrical device in a modular and simplified manner, in particular with a reduced number of parts. In particular, since the supports 2A and 2B are similar, even identical, the total number of different parts for making the device 1 is reduced. This makes it possible to reduce the unit cost of manufacturing the device 1 and to simplify the production on an industrial scale and assembly by the customer.

The support 2 can thus serve as a basis for constructing various devices and can therefore be used in a large number of different applications.

The assembly system formed by the nesting of the elements 91 and 92 allows fast and simple attachment of the support 2 to another corresponding element, for example to connect the supports 2A and 2B to each other.

The complementary positioning of elements 91 and 92 on supports 2A and 2B or, if appropriate, on support 2 and baffle 600 also ensures the function of maintaining polarity and prevents incorrect or unplanned adjacent positioning of these elements.

Since the support 2 is pre-assembled, it is not necessary to completely design the fixture of the device, in particular by connecting the apparatus 200 by pulling cable lines, which saves time for the assembler.

In particular, the combination of the preformed conductors 51, 52 and 53 in the also preformed case 4 allows, when assembling the device 1, to install and connect the apparatus 200 quickly and easily, while at the same time providing satisfactory protection and insulation of the conductors 51, 52 and 53, in particular to avoid accidental electrical connection between the electrical input and output of the device 2.

Due to the similar shape of the supports 2 and their spatial configuration, the device 1 is reversible and can thus be inserted into the receiving rack even after it has been switched on, for example by turning towards itself about the X-axis.

Any feature of one of the embodiments or the sub-options described above may be implemented in other embodiments and the sub-options described.

Claims (19)

1. A prefabricated support (2; 2A, 2B) for a rack-mountable electrical device, characterized in that it contains: – plate (6; 6A, 6B); – one-piece housing (4; 4A, 4B) mounted on a plate; – electrical connector (8; 8A, 8B) located on the rear side of the prefabricated support; – preformed electrical conductors (51, 52, 53; 51A, 52A, 53A; 51B, 52B, 53B), each containing a first end (55) and a second end (54); moreover, the housing forms a receiving socket (70) on the front side of the support, designed to receive an electrical switching device (200), the housing also defines a passage (58) in which electrical conductors are placed, each first end of each electrical conductor is connected to an electrical connector, and each second the end of each electrical conductor protrudes into the receiving socket, the body contains an electrically insulating separating wall (100) extending at right angles from the edge of the plate, said wall and at least one side of the plate form the side of the support containing at least one first fastener (91 ; 91A, 91B) and at least one second fastener (92; 92A, 92B), wherein each second fastener has a shape complementary to the first fastener, each first element and each second element are configured to engage, respectively, with the other second element and another first element. 2. Prefabricated support according to claim 1, characterized in that the first fastening element (91; 91A, 91B) is made as a single piece with the body (4), and in that the second fastening element (92; 92A, 92B) is made as single piece with plate (6). 3. Prefabricated support according to claim 1 or 2, characterized in that the body (4) and the plate (6) are made of an electrically insulating material. 4. A prefabricated support according to any of the preceding claims, characterized in that the first (91; 91A, 91B) and second (92; 92A, 92B) elements are configured to engage, respectively, with another second element and another first element. 5. Electrical device, characterized in that it contains at least one prefabricated support according to any one of paragraphs. 1-4 and an electrical switching device (200) located at least partially in the receiving socket (70) of said at least one prefabricated support and electrically connected to the second end of the electrical conductors of said at least one prefabricated support. 6. An electrical device according to claim 5, characterized in that it contains: - the only prefabricated support (2) according to one of paragraphs. 1-4; - an additional electrically insulating partition wall (600) attached to the dividing wall and containing the first fastening element (91C) and the second fastening element, similar to the first and second elements of the said support, respectively, the first and second fastening elements of the electrically insulating partition mating, respectively, with the second element (92) and the first element (91) of the dividing wall (100) so as to attach the baffle to the dividing wall. 7. An electrical device according to claim 5, characterized in that it contains: - the first prefabricated support (2A) according to any one of paragraphs. 1-4, - a second prefabricated support (2B) according to one of paragraphs. 1-4 identical or similar to the first prefabricated support, wherein the second support is attached to the first support, the first element (91A) of the first support is engaged with the second element (92B) of the second support, and the second element (92A) of the first support is engaged with the first element ( 91B) of the second leg, and the respective partition walls (100A, 100B) of the two legs come into contact with each other. 8. Electrical device according to claim 7, further comprising a cap (300) attached to the first and second supports on the front side of the device. 9. Electrical device according to claim 7 or 8, characterized in that it further comprises two gripping handles (400), each handle is attached respectively to one of the two supports, each handle protrudes relative to the front side of each support, the handles are identical and located symmetrically to each other with respect to the same connecting plane (J) formed by the contact surface between the two supports. 10. An electrical device according to claim 9, characterized in that at least one of said handles (400) comprises a mechanism for indicating the position of the electrical device in the rack, and this handle is equipped with a manual control lever (402) for this mechanism.

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