Improved fool-proofing device, electrical connection assembly comprising said improved fool-proofing device and associated assembly method

Abstract

The invention relates to an improved fool-proofing device for an electrical connection assembly, said device comprising: - a first part (3) and a second part (4), removably coupled via a mechanical link along a main axis (X), - the first part (3) comprising a first fool-proofing member (31) and the second part (4) comprising a second fool-proofing member (41), - the first part (3) comprising means for securing by interlocking of the first connector (1) on the reception panel (P) thereof, - the second part (4) comprising means for fastening by interlocking designed to fasten said second part (4) on the second connector (2), - the first part (3) and the second part (4) each comprising complementary mechanical fastening means, intended to mate with each other by interlocking when the first connector (1) and the second connector (2) are coupled.

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to an improved keying device and an electrical connection assembly provided with said improved keying device.

[0002] The invention also relates to a method of mounting the improved keying device.

[0003] The solution of the invention will be particularly perfectly suited to being associated with an electrical connection assembly used in an avionics bay. STATE OF THE ART

[0004] Conventionally, an electrical connection assembly comprises a so-called fixed connector and a mobile connector, called reverse, which plugs into the fixed connector to ensure the electrical connection.

[0005] As a reminder, avionics is the set of electronic, electrical and computer equipment that helps pilot aircraft and spacecraft in airspace or extra-planetary space.

[0006] As is known, an avionics bay is intended to accommodate electrical modules installed in a removable manner and intended to manage the various functions of the aircraft. The avionics bay has, in particular, racks or adjustable panels supporting electrical connectors associated with the various modules of the bay. The fixed connector is integrated into the panel and the reverse connector is intended to be inserted into the fixed connector to make an electrical connection.

[0007] In an avionics bay, several fixed connectors are often arranged side by side on the same panel and it is therefore necessary to ensure that each reverse connector is connected to the fixed connector associated with it.

[0008] For this purpose, mechanical keying solutions are used. The principle of mechanical keying is known in the field of electrical connection to ensure compatibility between two connectors and their proper connection. As a general rule, these are two elements that are positioned on the one hand on the fixed connector and on the other hand on the reverse connector and which can only be mechanically coupled when the following two conditions are met: The reverse connector chosen is the one associated with the fixed connector. The reverse connector is approached from the fixed connector with the correct orientation.

[0009] If the reverse connector is not the one intended to be connected to the fixed connector or if it is approached to the fixed connector in the wrong orientation, the keying device is responsible for preventing the connection between the two connectors. The keying device thus makes it possible to secure the electrical connection between two compatible connectors.

[0010] Patent US6394856B1 describes a keying device for a connection assembly with two electrical connectors. The device comprises two semi-cylindrical elements. The keying element located in the fixed connector is orientable around the connection axis, which ensures that the reverse connector, equipped with the complementary part, will be the one intended. This solution ensures orientable keying.

[0011] THEDocument EP 1437802A2 also presents a keying device for a two-part connector, male and female, each comprising a tubular portion and being provided with means of mutual fixing by snap-fastening.

[0012] THE Document EP 1732180A1 also discloses a keying device for a connector comprising two sockets whose removable complementary fixing means can only cooperate in a single predetermined angular position.

[0013] In the field of avionics, for safety reasons, it is also essential that the electrical connection between the two connectors of the same connection assembly is maintained securely and reliably over time.

[0014] Finally, it is obvious that the fixed connector must be fixed reliably and securely to its host panel, to avoid any tearing and therefore any untimely disconnection.

[0015] An electrical connection set must therefore have the following three functions: Ensure the correct association between the fixed connector and its reverse connector, Ensure the fixing of the fixed connector on its reception panel, Allow the connection between the fixed connector and its reverse connector to be locked.

[0016] Currently, there are no solutions that can fulfill all of these functions: In a simple way, with a minimum of parts, By limiting the number of operations during assembly / disassembly and during maintenance, Reliably in operation and over time, while remaining perfectly adaptable to different electrical connection solutions. STATEMENT OF THE INVENTION

[0017] This object is achieved by an improved keying device for an electrical connection assembly, according to claim 1, said connection assembly comprising a first electrical connector provided with a first body and intended to be fixed on a reception panel and a second electrical connector provided with a second body and intended to be connected to said first connector, said device comprising: A first part and a second part removably coupled via a mechanical connection along a main axis, The first part comprising a first keying member and the second part comprising a second keying member, The first part comprising first indexing means for taking several distinct orientations around said main axis and positioning said first keying member in a single first position around said main axis, The second part comprising second indexing means for taking several distinct orientations around said main axis and positioning said second keying member in a single second position around said main axis, said second position of the second keying member being chosen to allow a connection of the second connector to the first connector,The first part comprising means for securing the first connector by fitting onto its receiving panel, The second part comprising first means for fixing by fitting arranged to fix said second part onto the second connector, The first part and the second part each comprise second complementary mechanical fixing means, intended to cooperate with each other by fitting when the first connector and the second connector are coupled, these second complementary fixing means comprise one or more lugs deformable by flexion, each ending in a lug, each lug being produced on the second part and the slot being produced on the first part.

[0018] According to a particular feature, the first part comprises a first sleeve having a first side wall of circular section, said sleeve being provided with a first head which comprises first indexing shapes.

[0019] According to another particularity, the first keying member is produced on the first sleeve and comprises an elongated shape, arranged opposite the first head of the sleeve and forming an extension of its side wall, on a first angular portion thereof only. According to another particularity, the securing means comprise one or more first tabs deformable in flexion in an elastic manner, each having a lug, produced on the side wall of the first sleeve, on a second angular portion thereof, distinct from said first angular portion.

[0020] According to another feature, the second part comprises a second sleeve having a second side wall of circular section, said second sleeve being provided with a second head which comprises second indexing shapes.

[0021] According to another feature, the second keying member is produced on the second sleeve and has an elongated shape, arranged opposite the second head of the second sleeve and forming an extension of its side wall, on a first angular portion thereof only.

[0022] According to another feature, the first interlocking fixing means comprise one or more second elastically deformable flexing tabs, each having a lug, each tab being produced on the second side wall of the second sleeve, on a second angular portion thereof, distinct from the first angular portion.

[0023] According to another feature, the securing means comprise additional lugs made on the external face of the first side wall of the first sleeve.

[0024] According to another feature, the first fixing means comprise complementary lugs made on the external face of the second side wall of the second sleeve.

[0025] The invention also relates to an electrical connection assembly comprising a first connector provided with a first body and a second connector provided with a second body, said assembly comprising a keying device as defined above, said first part of the device being associated with the first connector and said second part of the device being associated with the second connector.

[0026] According to a feature, the first body of the first connector is provided with a first through opening comprising a first counterbore defining a first housing.

[0027] According to another feature, the second body of the second connector is provided with a second through opening comprising a second counterbore defining a second housing.

[0028] The invention also relates to a mounting method as disclosed in claim 13. This method of mounting an improved keying device as defined above to form the electrical connection assembly as defined above comprises a mounting phase comprising the following steps: Insertion of the first part of the device through a first opening made through the first body of the first connector, by choosing an orientation of the keying member around the main axis using the indexing means which cooperate with corresponding indexing means provided on the first body of the first connector, Fitting the assembly formed by the first part and the first connector onto a receiving panel of the first connector, said receiving panel being held between the first body of the first connector and the securing means of the first part of the device, Insertion of the second part of the device through a second opening made through the second body of the second connector,said second part being inserted to give an orientation to the second keying member around the main axis which is adapted to the orientation given to the keying member of the first part of the device, Fitting of the second part through the second body of the second connector, the first fixing means cooperating with the second body of said second connector, the assembly phase being characterized in that the second complementary fixing means, comprising the flexurally deformable tab(s) and the slot, are fitted by cooperation between the lug terminating the tab(s) and the slot and mechanically lock the coupling of the electrical connectors.

[0029] During the assembly phase, the second complementary fixing means comprising the flexibly deformable tab(s) and the slot are fitted together by cooperation between the lug terminating the tab(s) and mechanically lock the coupling of the electrical connectors. BRIEF DESCRIPTION OF THE FIGURES

[0030] Other features and advantages will appear in the detailed description which follows, made with reference to the attached figures listed below: There figure 1 schematically represents an electrical connection assembly whose fixed connector is mounted on a reception panel and shows the improved keying device according to the invention; The figure 2 shows, in top view, the fixed connector integrated into its reception panel; The figure 3 shows, in top view, the reverse connector of the electrical connection assembly; The Figures 4A and 4Brepresent, in perspective, the first part of the improved keying device of the invention, according to two separate views; The Figure 5 represents, in perspective, the second part of the improved keying device of the invention; The figure 6 illustrates the installation of the first part of the device of the invention on the body of a fixed connector integrated into its reception panel; The figure 7 illustrates the installation of the second part of the device of the invention on the body of a reverse connector; The figure 8 illustrates the principle of mechanical coupling and locking between the two parts of the improved keying device according to the invention; DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT

[0031] The invention relates to an improved keying device for association with an electrical connection assembly.

[0032] In reference to the figure 1, the electrical connection assembly conventionally comprises a first connector called fixed connector 1, intended to be fixed on a reception panel P and a second connector called reverse connector 2 intended to be plugged into the fixed connector 1. The two connectors can take any possible external shape, cylindrical, square, trapezoidal, etc.

[0033] For the remainder of the description, we define an axis (X) called the main axis, corresponding to the axis along which the reverse connector 2 is inserted into the fixed connector 1 to achieve their mechanical coupling and therefore the electrical connection.

[0034] In the remainder of the description, the terms "front" and "rear" are to be understood by following the main axis (X) and taking as reference the connection face of the connector, this connection face being located at the front for the connector considered.

[0035] The fixed connector 1 and the reverse connector 2 each comprise an external body 10, 20 integrating one or more electrical connection pins 11, 21.

[0036] The electrical connection assembly is intended in particular to be used in an avionics bay (not shown) and makes it possible to ensure a connection of an electrical module. The fixed connector 1 of the electrical connection assembly is intended to be integrated into a reception panel P or rack of the avionics bay and the mobile reverse connector 2 is positioned at the end of a ribbon cable or harness and is plugged into the fixed connector 1.

[0037] The invention aims to propose a device which makes it possible to fulfill the following three functions: Ensure the correct association between the fixed connector 1 and its reverse connector 2, Ensure the fixing of the fixed connector 1 on its reception panel P, Allow the connection between the fixed connector 1 and its reverse connector 2 to be locked.

[0038] The device is an improved keying device. It is made of two parts, called first part 3 and second part 4. Each part 3, 4 is in the form of a single monobloc part. In a non-limiting manner, the two parts can be made of metal or plastic material. Depending on the material used, any manufacturing solution can be considered, for example machining or molding.

[0039] It should be noted that the keying function performed by the device must be active before any connection between the two connectors 1, 2. The device must therefore be arranged so that its keying function prevents electrical connection between the two connectors, if the reverse connector that is presented is not the correct one or if it is presented in the wrong orientation relative to the fixed connector.

[0040] The first part 3 is associated with the fixed connector 1 and the second part 4 is associated with the reverse connector 2. The first part 3 is intended to be fixed on the body 10 of the fixed connector 1 and the second part 4 is intended to be fixed on the body 20 of the reverse connector 2.

[0041] In reference to the figure 2, the body 10 of the fixed connector 1 has a through opening made along an axis parallel to the main axis (X), provided with a counterbore on its rear face, said counterbore forming a first housing 12. The first housing 12 has indexing shapes 120.

[0042] In reference to the figure 3 , the body 20 of the reverse connector 2 also has a through opening, along an axis parallel to the main axis (X), provided with a counterbore on its rear face, said counterbore forming a second housing 22. The second housing 22 has indexing shapes 220.

[0043] Both parts are independent of their respective connector and can be combined with any existing electrical connection set to provide the three functions listed above.

[0044] In a non-limiting manner, the first part 3 and the second part 4 of the device each have a generally cylindrical sleeve shape, developed respectively around a first axis A1 and a second axis A2. Each sleeve 30, 40 comprises a cylindrical side wall developed around its respective axis and defining an axial central passage.

[0045] The first part 3 comprises a first keying member 31 and the second part 4 comprises a second keying member 41. The first keying member 31 and the second keying member 41 have complementary shapes which cooperate with each other when the reverse connector 2 and the fixed connector 1 are compatible and correctly associated with each other.

[0046] In reference to the Figures 4A, 4B, the sleeve 30 of the first part 3 comprises a head 32 provided with indexing shapes or notches 320 allowing it to take different possible orientations around its axis A1 when it cooperates with a corresponding housing. On the figure 2 , the head 32 is hexagonal in shape, allowing the first part 3 of the device to take six distinct positions. Any other shape could be envisaged, for example square, octagonal, series of notches, etc. The head 32 of the sleeve 30 is intended to cooperate with said first housing 12 having complementary indexing shapes 120 and produced at the rear of the body 10 of the fixed connector 1. The positioning of the first part in said first housing makes it possible, thanks to the complementary indexing shapes, to orient the first keying member 31 and to give it a single angular position around the axis A1.

[0047] In reference to the Figure 5, the sleeve 40 of the second part also comprises a head 42 also provided with indexing shapes or notches 420 allowing it to take different possible orientations around its axis A2 when it cooperates with a corresponding housing. In the attached figures, the head 42 is hexagonal in shape, allowing the second part 4 of the device to take six distinct positions. Any other shape could be envisaged, for example square, octagonal, series of notches, etc. The head 42 of the sleeve 40 is intended to cooperate with the second housing 22 having complementary indexing shapes 220 and produced at the rear of the body 20 of the reverse connector 2. The positioning of the second part 4 in said second housing 22 makes it possible, thanks to the complementary indexing shapes, to orient the second keying member 41 and to give it a single angular position around the axis A2.

[0048] Of course, the indexing shapes 320, 420 provided for the first part and the second part are advantageously provided to be identical and the two angular positions of the two keying members 31, 41 are chosen in a suitable manner to allow coupling between the two parts when the two connectors are compatible and the reverse connector 2 is presented with the correct orientation relative to the fixed connector 1.

[0049] Of in a non-limiting manner, the first keying member 31 and the second keying member 41 may have an elongated shape of constant section, for example a wall of semi-circular or semi-cylindrical section.

[0050] The sleeve 30 of the first part 3 and the sleeve 40 of the second part 4 integrate two functions. Their wall is divided into two distinct sections, for example each of semi-circular shape.

[0051] For the first part 3 of the device, on a first section, for example semi-circular, the wall of the sleeve 30 is extended to form the first keying member 31 which stands opposite its head 32. On a second section, for example semi-circular, the wall of the sleeve 30 has at its top, opposite its head, one or more tabs 33 each carrying a lug 330. In the attached figures, three lugs 330 are shown, forming a first row. The lugs 330 are oriented outwards and are intended to come to bear on the front face of the reception panel P of the fixed connector 1. The reception panel P is then held between the head 32 and the lugs 330 of the first part 3 of the device. The distance between the head and the lugs is of course adapted to the thickness of the assembly composed of the body 10 of the fixed connector 1 and the panel P at this location.

[0052] For the second part 4 of the device, on a first section, for example semi-circular, the wall of the sleeve 40 is extended to form the second keying member 41 which stands opposite its head 42. On the second section, for example semi-circular, the wall of the sleeve 40 has at its top, opposite its head 42, one or more tabs 43 each carrying a lug 430. In the attached figures, three lugs 430 are shown, forming a first row. The lugs 430 are oriented outwards and are intended to bear on the front face of the reverse connector 2, to secure the second part 4 to the body 20 of the connector 2. The distance between the head 42 and the lugs 430 is of course adapted to the thickness of the body of the reverse connector at this location.

[0053] The first part 3 of the device thus comprises means for securing the fixed connector 1 to its receiving panel P, these securing means operating by interlocking, or in other words by clipping.

[0054] The second part 4 of the device comprises for its part means of fixing by interlocking, in other words by clipping, arranged to allow it to be fixed on the body 20 of the reverse connector 2.

[0055] The first part 3 and the second part 4 of the device also each comprise complementary fixing means allowing them to be combined together to create a stable mechanical connection and thus ensure the maintenance and locking of the electrical connection between the two connectors 1, 2.

[0056] These fixing means are in the form of one or more tabs 44 arranged on the second part 4, each provided with a terminal lug 440 and standing at the top of a wall arranged inside the sleeve and culminating above the first row of lugs 430 dedicated to fixing the second part 4 on its connector 2. On the side of the first part 3, a slot 34 or complementary groove is made through the wall forming the keying member 31, this slot 34 being intended to receive said lugs 440 of the second part to achieve a fitting of the second part on the first part. figure 8 illustrates the principle of interlocking between the two parts of the device to lock the connection.

[0057] It should be noted that the legs 33, 43, 44 produced on the first part 3 as well as on the second part 4 are of course designed to deform in flexion in an elastic manner around their base, in order to pivot sufficiently during assembly by interlocking or during disassembly and to return to an initial state after flexion.

[0058] In reference to the figures 6 to 8 , the operating principle is as follows: Step 1: The first part 3 of the device is associated with the fixed connector 1. It is inserted from the rear of the body 10 of the fixed connector 1, through the opening made through the body of the connector along its axis A1, oriented parallel to the main axis (X), its head 32 coming to rest in the first complementary housing 12, choosing a first orientation around the main axis (X), thanks to the indexing shapes 320 of its head and those of the corresponding housing. Step 2: The first part 3 is pushed into the first housing up to its head 32, the complementary indexing shapes cooperating with each other to block rotation around the axis.Step 3: Maintaining said orientation, the first part 3 of the device is engaged by its end opposite its head in a corresponding orifice of the reception panel P, until it fits onto the panel, holding the panel P between the body 10 of the connector 1 and the lugs 330 of the first part of the device. Step 4: The second part 4 of the device is inserted from the rear of the body 20 of the reverse connector 2, its axis A2 being oriented parallel to the main axis (X), until its head 42 is pushed into the second housing 22. The engagement is carried out by orienting the second part 4 around the main axis (X) in a suitable manner to correspond to the orientation given to the first part 3 of the device and to fulfill the keying function. Step 5: maintaining the chosen orientation, the second part 4 is pushed through the body of the connector until it fits between its lugs 430 and the body 20 of the connector.Step 6: In operation (. figure 8 ), when the reverse connector 2 is brought close to the fixed connector 1, with the correct orientation, the keying device allows coupling. When the connectors are coupled, the second part 4 of the device fits into the first part 3 by cooperation between the lugs 440 and the slot 34, thus allowing the coupling and therefore the electrical connection to be mechanically locked.

[0059] In a non-limiting manner, several improved keying devices in accordance with the invention can be used for the same electrical connection assembly.

[0060] Where a plurality of identical connection assemblies are arranged on a single panel, at least one separate improved keying device may be associated with each electrical connection assembly, the keying devices each being configured differently, with different indexings to provide different orientations to their keying member and thus avoid any connection error.

[0061] In an alternative embodiment, it is also possible to provide in the first part and / or the second part of the device additional fixing members, supplementing their first row of tabs+lugs. This may for example be a bead or lugs made on the external face of the sleeve wall.

[0062] The disassembly of the device is also easy. It can be implemented by introducing a tube along the axis A1 into the first part 3, in order to retract the lugs 440 of the second part 4 and dislodge them from the slot 34.

[0063] Of course, it must be understood that the dimensional characteristics (length, diameter) and shape of the two parts of the device can be adapted and that other geometries can be considered.

[0064] Similarly, the material used for the two parts is chosen according to the mechanical characteristics required for the application. Any material with properties consistent with the connector's environment (temperature, pressure) and the compatibility constraints of this material (resistance to fluids, galvanic couple), can be used to produce each of the two parts of the device.

[0065] The solution of the invention thus presents numerous advantages, among which: It provides the keying function to secure the association between two connectors of the same connection set; It ensures the fixing of the fixed connector on its receiving panel, by simple interlocking, therefore without using a tool and therefore without applying a tightening torque; It allows the connection between the fixed connector and its reverse connector to be locked, by simple interlocking, therefore also without using a specific tool and without applying a tightening torque.

Claims

1. A fool-proof device for an electrical connection assembly, said connection assembly comprising a first electrical connector (1) having a first body (10) and is intended to be fixed to a panel (P) that accommodates it, and a second electrical connector (2) having a second body (20) and is intended to be connected to said first connector (1), said device comprising: a first part (3) and a second part (4) which can be removably coupled via a mechanical link along a main axis (X), the first part (3) having a first fool-proof member (31) and the second part (4) having a second fool-proof member (41), the first part (3) having a first indexing device for taking multiple distinct orientations about said main axis (X) and positioning said first fool-proof member in a single first position about said main axis (X), the second part having a second indexing device for taking multiple distinct orientations about said main axis and positioning said second fool-proof member in a single second position about said main axis (X), said second position of the second fool-proof member being chosen so as to allow the second connector to be connected to the first connector, the first part (3) having an interlocking securing device for interlockingly securing the first connector (1) to the panel (P) that accommodates it, and the second part (4) having a first interlocking fixing device that are arranged so as to fix said second part (4) to the second connector (2), Characterized in that: the first part (3) and the second part (4) each have a second complementary mechanical fixing devices that are intended to interact with one another by interlocking when the first connector (1) and the second connector (2) are coupled, the second complementary fixing device having a slot (34) and one or more flexurally deformable tabs (44), each of which ends with a lug (440) and stands out at the top of a wall arranged inside the first fixing device (43) for fixing the second part (4) to its connector (2) while still culminating them, each tab being made on the second part (4) and the slot (34) being made on the first part (3).

2. The device as claimed in claim 1, wherein the first part (3) has a first sleeve (30) having a first lateral wall with a circular cross section, said sleeve being fitted with a first head (32) which has first indexing shapes (320).

3. The device as claimed in claim 2, wherein the first fool-proof member (31) is made on the first sleeve and has an elongate shape, which is arranged opposite the first head (32) of the sleeve and forms a continuation of its lateral wall, solely on a first angular portion thereof.

4. The device as claimed in claim 3, wherein the securing device has one or more first elastically flexurally deformable tabs (33), each of which has a lug (330) and which are made on the lateral wall of the first sleeve (30), on a second angular portion thereof, separate from said first angular portion.

5. The device as claimed in claim 4, wherein the securing device have complementary lugs made on the outer face of the first lateral wall of the first sleeve.

6. The device as claimed in any one of claims 2 to 5, wherein the second part (4) has a second sleeve (40) having a second lateral wall with a circular cross section, said second sleeve (40) being fitted with a second head (42) which has second indexing shapes (420).

7. The device as claimed in claim 6, wherein the second fool-proof member (41) is made on the second sleeve (40) and has an elongate shape, which is arranged opposite the second head (42) of the second sleeve and forms a continuation of its lateral wall, solely on a first angular portion thereof.

8. The device as claimed in claim 7, wherein the first interlocking fixing device has one or more second elastically flexurally deformable tabs (43), each of which has a lug (430), each tab being made on the second lateral wall of the second sleeve, on a second angular portion thereof, separate from the first angular portion.

9. The device as claimed in claim 8, wherein the first interlocking fixing device has complementary lugs made on the outer face of the second lateral wall of the second sleeve.

10. An electrical connection assembly comprising: a first connector (1) provided with a first body (10), a second connector (2) provided with a second body (20), and a fool-proof device as defined in claim 1, said first part (3) of the device being associated with the first connector (1) and said second part (4) of the device being associated with the second connector (2).

11. The connection assembly as claimed in claim 10, wherein the first body of the first connector is provided with a first through-opening comprising a first spot face defining a first housing (12).

12. The connection assembly as claimed in any one of claims 10 or 11, wherein the second body of the second connector is provided with a second through-opening comprising a second spot face defining a second housing (22).

13. A method for mounting an improved fool-proof device as defined in any one of claims 1 to 9 on first body (10) of a first connector (1) and a second body (20) of a second connector (2) to realise an electrical connection assembly as defined in any of claims 10 to 12, said method comprising a mounting phase having the following steps: inserting the first part (3) of the device through a first opening made through the first body (10) of the first connector (1), by choosing an orientation of the fool-proof member (31) about the main axis (X) by virtue of the indexing device which interact with corresponding indexing device provided on the first body (10) of the first connector (1), interlocking the assembly formed from the first part (3) and the first connector (1) in a panel (P) that accommodates the first connector (1), said panel (P) that accommodates said first connector being held between the first body (10) of the first connector (1) and the securing device of the first part (3) of the device, inserting the second part (4) of the device through a second opening made through the second body (20) of the second connector, said second part (4) being inserted so as to give the second fool-proof member (41) an orientation about the main axis (X) that is adapted to the orientation given to the fool-proof member (31) of the first part (3) of the device, interlocking the second part (4) through the second body (20) of the second connector (2), the first fixing device interacting with the second body (20) of said second connector (2), the mounting phase being characterized in that the second complementary fixing device having the flexurally deformable tab(s) (44) and the slot (34), and are interlocked by interaction between the lug (440) ending the tab(s) (44) and mechanically lock the coupling between the electrical connectors.

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