FR2830816A1 - Automobile seat comprises airbag casing fixed onto seat frame by two spindles engaging gripping washers integral with frame - Google Patents

Abstract

The casing (3a) for the airbag (3) comprises a two rapid mechanical spindles (6) fixing onto the seat frame (2) which engage by force two gripping washers (5) integral with the frame.

Description

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 The invention relates to a motor vehicle seat comprising a quick-mounting airbag safety device and a device for controlling the mounting of the safety device.

 Motor vehicle seats are known comprising a metal frame covered by a padding which is itself wrapped in a cover made of flexible material such as a fabric. Such motor vehicle seats may include an airbag safety device in a lateral arrangement relative to the backrest.

 Such airbag or side airbag safety devices comprise a rigid housing fixed to the frame having an airbag outlet orifice along a lateral side of the vehicle seat, this housing being closed by a cover which breaks when inflation and the exit of the airbag, after the triggering of the safety device, in the event of an accident.

 The housing of the safety device must be fixed by mechanical means to the seat frame and generally to the seat back frame, in a lateral arrangement.

 The realization of improved seats in modern vehicles is accompanied by a complication of the seat frames, so that it becomes difficult to have access to possible mechanical fastenings of a safety device box or side airbag. , from inside the seat.

 In addition, in certain cases, it may be advantageous to make the seat upholstery before fixing the airbag; in this case, mechanical means of fixing the airbag housing must be available, without intervention from inside the seat.

 Until now, it has not been envisaged to use mechanical devices for fixing a lateral airbag box on a motor vehicle seat which can be actuated from outside the seat, insofar as it is wanted to be able to control the fixation after its realization.

 The object of the invention is therefore to propose a motor vehicle seat comprising a metal frame and an airbag safety device comprising a housing fixed to the seat frame in an arrangement

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 lateral position, the seat being produced in such a way that the housing can be fixed to the frame without intervention inside the seat.

 For this purpose, the housing comprises a mechanical means of attachment to the seat frame by force engagement on a cooperating element secured to the metal frame, the mechanical means secured to the housing and the cooperating element secured to the metal frame constituting a mechanical device for rapid fixing of the housing with an automatic fixing control.

 The invention also relates to particular embodiments of the mechanical fixing means and to a device for controlling the mounting of the airbag safety device.

 In order to clearly understand the invention, a description will now be given, by way of examples, with reference to the figures, of several embodiments of rapid fixing devices and of means for automatically controlling the rapid fixing of a housing of airbag on a motor vehicle seat.

 Figure 1 is a side view of a metal frame of a motor vehicle seat seen from the inside of the seat, on which is attached by quick attachment the housing of a side airbag.

 Figure 2A is a sectional view along 2-2 of Figure 1, of a quick fastener according to a first embodiment.

 Figure 2B is a sectional view along 2-2 of Figure 1, of a quick fastener according to a variant of the first embodiment.

 Figure 2C is a top view of a grippax washer constituting the element of the quick fastening, integral with the seat frame.

 Figure 3 is a sectional view similar to the views of Figures 2A and 2B showing an automatic control means of the quick fastening according to the first embodiment or its variant.

 Figure 4 is a partial view similar to the view of Figure 3 showing an automatic control means of the quick attachment according to a variant.

 Figure 5 is a side view in elevation of a side portion of a metal frame of a motor vehicle seat on which is

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 mounted a housing of a side airbag by quick attachment means according to a second embodiment.

 Figure 6 is a sectional view along 6-6 of Figure 5.

 Figure 7 is a perspective view of the airbag housing shown in Figures 5 and 6 and its quick attachment means.

 Figure 8 is a perspective view of a complementary locking means of the airbag housing.

 Figure 9 is a sectional view along 9-9 of Figure 8 of the complementary locking device.

 Figure 10 is a sectional view of an airbag housing, of a portion of a motor vehicle seat frame on which the airbag housing is fixed by quick attachment according to a third embodiment and d '' an electrical device for automatic control of the attachment of the airbag box to the metal frame.

 Figure 11 is a perspective view of the airbag and the metal frame of the motor vehicle seat shown in Figure 10 showing an automatic locking device of the airbag and actuation of the automatic fixing control device.

 FIG. 12 is an enlarged view of a detail of FIG. 10.

11. Figure 13 is an enlarged view of a detail of the figure

11.

 FIG. 14 is a perspective view on a large scale of a connector of the automatic electrical fixing control device shown in FIGS. 10 and 11.

 In Figure 1, we see a side portion of the metal frame 2 of a motor vehicle seat generally designated by the reference 1 on which is fixed, in a lateral arrangement, an airbag safety device 3 comprising a case closed by a cover, the side airbag case 3 being fixed to the metal frame 2, in a lateral arrangement, by two quick fixing devices 4, of mechanical type.

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 In FIG. 2A, there is seen a quick fixing device 4 for the airbag housing 3 produced according to a first embodiment.

 The metal frame 2 of the motor vehicle seat comprises a profiled lateral upright on which is fixed the housing 3a of the lateral airbag which is closed by a cover 3b comprising a preferential peripheral rupture line.

 The quick fixing device 4 according to the first embodiment shown in FIG. 2A is constituted by an elastic clamping washer 5 cooperating with an axis or stud 6 secured to the housing 3a of the airbag 3.

 As can be seen in FIG. 2C, the elastic fixing and tightening washer 5, of the grippax washer type, is constituted by a metal plate 5 of planar or curved shape traversed by an opening 7 comprising a circular part in four parts 7a, separated from each other by four extensions of radial direction 7b arranged at 900 around the axis of the circular part of the opening 7.

 The plate constituting the grippax washer 5 is trapped inside a support 8 of generally tubular shape having an engaged part and fixed inside a through opening of the frame and a part arranged inside the frame 2 ensuring the retention of the support 8.

 The opening passing through the frame 2 has a diameter substantially equal to the diameter of the axis 6 which can be engaged inside the washer support 8, along the axis 5a of the washer 5.

 The parts 7a in the form of an arc of a circle of the opening 7 are arranged in a circle whose diameter is less than the diameter of the axis 6, so that the axis 6 must be forcibly engaged in the opening 7 of the grippax washer which deforms elastically inside the support 8 and ensures, by elastic return, the locking and locking of the axis 6 in the engagement position.

 To facilitate its introduction into the opening of the washer 5, the axis 6 has, at its end, a chamfered part. As shown in FIG. 1, the housing 3a of the airbag 3 is fixed to the frame 2 by two identical quick-fixing devices 4 each comprising a grippax washer,

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 a washer support and an axis integral with the housing 3. The distance between the two axes integral with the housing 3 is equal to the distance between the openings of the frame 2 along which the supports 8 of the washers 5 are fixed.

 The airbag box 3a is fixed to the lateral upright of the seat frame 2 by inserting the two axes 6 integral with the box, each in the opening of a washer support 8 and in the through opening of the armature. By exerting pressure on the housing 3a of the airbag 3, the two axes 6 are simultaneously introduced into the openings of the washers 5 which ensure, by elastic return, after deformation, the tightening and locking of the two axes and of the housing 3a the airbag 3.

 In FIG. 2B, an alternative embodiment of the quick fastening device 4 has been shown in which the washer 5 is produced in the form of a clip-on washer comprising a metal plate traversed by an opening similar to the opening 7 shown on Figure 2C, folded to form two elastic fixing claws in the frame 2, at its through opening.

 In the case of a device comprising a grippax washer 5 inside a washer support 8, the support 8 is mounted in preparation on the frame 2 and, in the case of the use of a clip 5 '' comprising elastic hooking means in a through opening of the frame 2, the stapling of the washer 5 'is directly carried out on the frame, before carrying out the rapid fixing of the airbag 3.

 In the case of the variant embodiment shown in FIG. 2B, two quick fastening devices 4 are also used in the usual way, each comprising a grippax washer and an axis integral with the airbag housing 3.

 When mounting and quickly attaching the airbag to the metal frame 2 of the seat, all of the operations are carried out from the outside of the seat, on the lateral side of the frame, these operations consisting solely of engaging in force the axes 6 secured to the airbag housing 3a in the grippax washers 5 or 5 ′ of the fixing devices 4.

 The assembly of the airbag which requires no intervention on the inside of the frame 2 is thus made particularly easy and quick.

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 However, the person responsible for mounting the airbag on the seat frame must have means of control to verify that he has actually achieved satisfactory fixing of the airbag box.

 As shown in FIG. 3, it is possible to provide an extra length L of the fixing axis 6 integral with the airbag housing 3a, which corresponds to the residual length of the cylindrical fixing part of the axis 6 au- beyond the washer 5, during maximum engagement of the axis 6 inside the support 8 of the washer 5, the internal face of the housing then being in abutment against the lateral face of the frame 2.

 If the excess length L of the axis is greater than the length 1 of a covering edge of the cover 3b of the airbag 3, a failure to engage the axes of the housing results in insufficient engagement of the cover 3b, as shown by the position 3′b in broken lines of the cover 3b in FIG. 3. In this case, the rim of the cover 3b is not joined by its peripheral curved covering part with the external surface of the seat constituted by a covering 25 covering the frame 2, itself covered with a cap 26. This results in a visible defect, when the engagement of the airbag housing 3a is carried out in a cavity of the seat cushioning which has been made the filling. If there is no mark on the outside of the seat, the extra length L of the axis 6 is however sufficient to allow effective attachment of the airbag without completely abutting the housing 3a on the frame 2.

 In the case of mounting of the airbag box on the frame 2 before its filling, the fixing of the box can be directly controlled.

 In all cases, the position of engagement of the axis 6 in the grippax washer 5 can be controlled from outside the seat of the motor vehicle.

 As shown in Figure 4, one can also provide a groove 6 'following the periphery of the axis 6, in an axial position (along the axis 5a of the opening passing through the frame 2 and the washer 5) , such that the edge of the opening 7 of the washer 5 constituted by an edge 7a in the form of an arc of a circle penetrates into the groove 6 ′, at the end of the displacement of the axis 6, for fixing the housing of the airbag. In this case, when the circular edge

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 7a of the opening 7 of the washer 5 penetrates into the groove 6 ′, the fitter responsible for fixing the airbag box to the seat frame perceives a metallic noise, so that he can thus verify that the the airbag axes 6 have been engaged up to the desired position. The groove 6 ′ of the axes 6 of the airbag also ensures locking of the axes on the washers 5 of the quick-fixing devices.

 The quick fastening devices 4 comprising axes integral with the airbag housing which are engaged in a transverse direction of the motor vehicle in openings passing through the frame of the motor vehicle seat and in grippax washers are designated as "quick fastening devices at Y ", the direction Y designating the transverse horizontal direction of the motor vehicle in which the fixing axes 6 of the airbag are engaged.

 Such a fixing method makes it possible to carry out a completely blind fixing from outside the seat of the motor vehicle covered by its lining with perfect control of the effective implementation of the fixing.

 FIG. 5 shows a lateral part of the frame 2 of a motor vehicle seat, the frame 2 having, in its longitudinal direction disposed on the seat in service in a practically vertical direction, a trapezoidal shape and increasing width from top to bottom.

 This usual geometric shape of the lateral uprights of the metal frame 2 of the seats of a motor vehicle is used to make a quick fixing according to a second embodiment, by means of a first quick fixing device 4a, called a fixing flange. high, and of a second quick fastening device 4b, called low fastening flange, the high fastening 4a and the low fastening 4b being both constituted by a profile having a cross section making it possible to circumscribe the external face of the frame 2, as can be seen in particular in FIG. 6.

 As can be seen in FIG. 7, the upper fixing flange 4a and the low fixing flange 4b are integral with the housing 3a of the airbag 3, respectively in its upper part and in its lower part, via the

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 median of a substantially flat part fixed on a flat internal surface of the airbag housing 3a.

 Each of the fixing flanges 4a and 4b comprises, on one side of its planar fixing part, a first folded rim intended to cover a first substantially vertical longitudinal end edge of the frame 2 and a branch inclined relative to the flat fixing part terminated by a second curved rim covering a second longitudinal edge of the frame 2.

 The upper fixing flange 4a and the lower fixing flange 4b have different dimensions in the transverse direction, between their curved end portions, so that the upper fixing flange 4a whose length in the transverse direction is shorter that the length of the lower fixing flange 4b can enclose with blocking an upper part of the lateral upright of the metal frame 2 of a shorter length in the transverse direction than a lower part clamped with blocking by the low fixing flange 4b.

les deux brides 4a et 4b de fixation de l'airbag 3 le long de la partie trapé- zoïdale du montant latéral de l'armature 2 jusqu'à venir en blocage lorsque le boîtier d'airbag 6 est dans sa position voulue représentée sur la figure 5. The transverse dimension and the elasticity of the high fixing flanges 4a and low fixing 4b are determined so that one can slide

the two flanges 4a and 4b for fixing the airbag 3 along the trapezoidal part of the lateral upright of the frame 2 until it locks when the airbag housing 6 is in its desired position shown in the figure 5.

In this position, generally, the low fixing flange 4b has reached the end of a straight part of the edges of the lateral upright of the frame 2 so that it is in abutment.

 The engagement of the low 4b and high 4a fixing flanges of the airbag housing is carried out in the longitudinal direction of the upright of the seat frame 2, that is to say in a practically vertical direction or Z direction of the motor vehicle.

 The low fixing flange 4b slides without difficulty along the edges of the upper trapezoidal part of the upright of the frame 2, until it comes into the clamping position in the vicinity of the lower part of this trapezoidal part. The high fixing flange 4a engaged last on the edges of the upright of the frame 2 then comes into the blocking position in the vicinity

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 from the upper end of the trapezoidal part of the upright of the frame 2. This provides automatic fixing and locking of the airbag housing on the upright of the seat frame, with perfect control of the position of blockage which results in an inability to continue to move the airbag housing down the upright.

 To perfect the locking of the airbag housing on the frame 2 of the motor vehicle seat, at the end of engagement of the fixing flanges 4a and 4b, an opening 10 may pass through the frame 2 and a curved elastic tongue 11 'on a rear end part (in the direction of movement during assembly) of the high fixing flange 4a or of the low fixing flange 4b. The elastic tongue 11 curved towards the inside of the frame 2 deforms, when the curved edges of the transverse end of the flanges 4a and 4b are engaged on the edges of the upright of the frame 2 to come into a parallel position on the surface of the frame, as shown in solid lines in FIGS. 8 and 9.

 When the fixing flange 4a (or 4b) reaches its locking position, the tongue 11 reaches the opening 10, the position of which is determined as a function of the locking position of the fixing flange. By elasticity, the locking tab 11 is curved and penetrates inside the opening 10 by blocking the fixing flange and the airbag housing, as shown in broken lines (position 11 '). It is then no longer possible to move the airbag housing in the vertical direction Z. For reasons of mounting convenience, it is preferable that the elastic locking tab 11 is located on the rear engagement part, c 'is to say the upper part of the upper fixing flange rather than integral with the low fixing flange whose displacement along the frame is of greater length, during the engagement of the airbag housing.

 The tongue 11 constitutes not only a locking element but also an element for automatically locating the locking position of the airbag housing on the frame 2 of the motor vehicle seat.

 In FIGS. 10 to 14, a third embodiment of the means for fixing and locking an airbag box 3 is shown on the

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 amount 2 of the frame of a motor vehicle seat, the fixing device shown in Figures 10 to 14 comprising an automatic locking means of the electrical type verification.

 The lateral upright of the frame 2 of the motor vehicle seat comprises, as shown in FIGS. 10 and 11, two through openings 12a and 12b at each of which, on the inside of the frame 2, is fixed by l 'through a corresponding tab 13a or 13b, a respective connection head 14a or 14b.

 The connection head 14a is connected to a firing control harness 15 for inflating the airbag of the airbag 3 comprising two firing channels and a ground wire. The two firing paths and the ground wire are connected to respective pins 16 projecting outwards from the connection head 14a.

 The connection head 14b is connected to a ground harness 17 connected to one or more connection pins 18 projecting outwards from the connection head 14b fixed on the fixing lug 13b secured to the frame 2.

 The airbag housing 3 is integral on its substantially flat internal face with two connectors 19a and 19b comprising studs intended to come to engage on the pins of the connection heads 14a and 14b to supply the ignition. airbag 3.

 Each of the connection heads 14a and 14b fixed by a lug 13a or 13b on the internal face of the frame 2 of the motor vehicle seat has a respective lateral slot 20a or 20b in which is engaged an elastic branch of a locking spring 21 produced by bending a wire or an elastic bar into a U, so as to comprise a common central part fixed to the frame 2 of the seat forming at its ends two loops whose elastic parallel branches 21a and 21b constitute the parts end.

 The bending of the elastic wire 21 is carried out in such a way that the elastic parallel branches at the end of the spring 21 are directed so as to move apart from one another towards the outside in the unstressed state of the spring 21.

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engagés sur les broches de la tête de connexion 14a et la branche 21a du ressort 21 rappelée élastiquement vers l'extérieur vient s'engager dans l'ouverture latérale 22a du connecteur 19a, réalisant ainsi le verrouillage du connecteur 19a solidaire du boîtier de l'airbag 3 sur la tête de connexion 14a et par l'intermédiaire de la patte 13a sur l'armature 2. As can be seen in FIG. 12, the connector 19a has a lateral opening 22a extending from the lateral opening 20a of the connection head 14a, when the connector 19a is engaged in the locking position and connection to the inside of an opening of the frame 2 and of the connection head 14a. The connector pads are then

engaged on the pins of the connection head 14a and the branch 21a of the spring 21 resiliently biased outwards engages in the lateral opening 22a of the connector 19a, thus realizing the locking of the connector 19a secured to the housing of the airbag 3 on the connection head 14a and via the tab 13a on the frame 2.

 The firing channels 16a and 16b of the connection head 14a are then connected to the firing conductors of the airbag.

 The third channel 16c of the connection head 14a connected to a ground wire or cable is connected to a pad of the connector 19a ensuring the earthing of the firing device by means of a switch 23a which is actuated by the branch 21a of the spring when the branch 21a enters the lateral opening 22a of the connector 19a when the connector and the airbag housing are locked by the spring 21.

 The second connection head 14b and the corresponding connector 19b have only one line and a grounding conductor, the grounding conductor of the connector 19b comprising a switch similar to the switch 23a which is actuated by the elastic branch 21 b of the spring 21, when the locking of the connector 19b on the connection head 14b is carried out by introduction of the elastic branch 21 b of the spring 21 into the lateral opening 22b of the connector 19b.

 The switches of the grounding lines of the connectors 19a and 19b are connected in series, so that the locking control can be carried out on the two connectors 19a and 19b.

 Locking traceability is obtained due to the fact that a locking control of the two connectors and of the connection can be carried out by simple control of electrical continuity between the two ground lines, using at least one control circuit comprising at least one signaling means.

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 It is thus possible to verify, when mounting the airbag, that the two of the two connectors integral with the airbag housing are locked and, during the operation of the motor vehicle, it is possible to permanently check that the connections are correctly made by continuously checking the electrical continuity between the ground wires.

 Instead of a single spring engaged between the connection heads having opposite side openings, two generally U-shaped springs having two parallel branches can be used, one of which is integral with the corresponding fixing lug 13a or 13b and the other of which is engaged in the lateral opening 20a or 20b of the corresponding connection head.

 When the connectors 19a and 19b are engaged in the connection heads, the branches engaged in the lateral openings of the connection heads and resiliently biased towards the outside come to engage in the lateral openings 22a and 22b of the connectors 19a and 19b by performing the locking and, simultaneously, the connection of the ground lines.

 In all cases, therefore, perfect control of the locking and of maintaining the locking and of the connections during the operation of the motor vehicle is obtained.

 In Figure 13, there is shown the connector 19a in the locked position, the corresponding connection head 14a being removed to show the connector 19a.

 In Figure 14, there is shown the connector 19a having an engagement portion 19'a of pyramidal shape whose section is a rectangle with rounded angles.

 On its lateral part, the connector body 19a has the opening 22a making accessible the end of the rod 23'a of the switch 23a biased outwards by a return spring, so that it can be actuated by the branch 21a of the locking spring 21 when the switch is engaged.

 We also see on the end surface of the engagement part 19'a of the switch 19a the pads 24a, 24b and 24c ensuring respective

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vement la commutation avec une première voie de commande de mise à feu de l'airbag, avec une seconde voie de mise à feu de l'airbag et avec le fil de masse.

switching with a first airbag firing control channel, with a second airbag firing channel and with the ground wire.

 The vehicle seats according to the invention therefore make it possible to lock a lateral airbag box on the seat frame, entirely from the outside, with perfect control of the locking and of the connection of the airbag module to electrical supply means.

 The invention is not limited to the embodiments which have been described.

 Thus, it is possible to use other mechanical means of rapid fixing of the housing to the metal frame of the seat of a motor vehicle, these mechanical fixing means being able to be accessible on the seat equipped with its lining or only on the uncoated metal frame.

 One can also provide means for automatic control of the fixing of the housing different from those which have been described.

 The invention applies to any motor vehicle comprising seats fitted with side airbags.

Claims (11)

 CLAIMS 1. - Motor vehicle seat comprising a metal frame (2) and an airbag safety device (3) comprising a housing (3a) fixed on the frame (2) of the seat in a lateral arrangement, characterized by fact that the housing (3a) comprises a mechanical means (6,4a, 4b, 19a, 19b) for fixing the housing (3a) on the frame (2) by force engagement on a cooperating element (5,2, 6 , 14a, 14b, 21) secured to the metal frame (2), the mechanical means secured to the housing (3a) and the cooperating element secured to the metal frame (2) constituting a mechanical device for rapid fixing of the housing ( 3a) with an automatic fixing control.  2.-vehicle seat according to claim 1, characterized in that the mechanical means for fixing the housing (3a) is constituted by at least one axis (6) and that the cooperating element integral with the metal frame (2 ) is constituted by at least one fixing washer by deformation and elastic return, called grippax washer having an opening (7) for engaging the axis (6).  3. Motor vehicle seat according to claim 2, characterized in that the housing (3a) of the airbag safety device (3) has two axes (6) and that the cooperating means integral with the frame (2 ) have two grippax washers (5) arranged on the frame (2) with a center distance equal to the center distance of the axes (6) integral with the housing (3a) of the airbag safety device (3), the axes (6 ) and the washers (5) having their geometric axes directed in a transverse horizontal direction of the motor vehicle.  4. Vehicle seat according to any one of claims 2 and 3, characterized in that the at least one grippax washer (5) is fixed in a support (8) integral with the frame (2).  5. Vehicle seat according to any one of claims 2 and 3, characterized in that the at least one grippax washer (5) constitutes a clip comprising elastic fixing means in an opening passing through the frame (2 ) of the motor vehicle seat.  6. Vehicle seat according to any one of claims 2 to 5, characterized in that the at least one axis (6) integral with the housing (3a) of the <Desc / CRUD Page number 15>  airbag safety device (3) has an excess length (L) of engagement through the grippax washer (5) greater than a length (1) in the direction of the engagement axis (5a) of the washer ( 5) a means of covering the lining (25, 26) of the motor vehicle seat.  7.-vehicle seat according to any one of claims 2 to 5, characterized in that the at least one axis (6) integral with the housing (3a) of the safety device (3) with an airbag has a groove (6 ') for engaging a deformable rim (7a) of the opening (7) of the grippax washer (5).  8. Vehicle seat according to claim 1, characterized in that the cooperating element of the metal frame (2) is constituted by a substantially vertical upright of the metal frame (2) comprising two engagement flanges d 'first and second flanges (4a, 4b) for fastening integral with the housing (3a), the amount of the metal frame (2) of the seat of a motor vehicle of substantially vertical direction having a trapezoidal shape, so that its lateral sides deviate from each other from top to bottom, and that the mechanical means of fixing the housing (3a) to the frame (2) of the seat is constituted by the first and second flanges of fixing comprising, at their ends, in a transverse direction of the amount of the frame (2), two engagement edges on two edges of the amount of the metal frame (2) of the seat of the motor vehicle, the two flanges (4a ) and (4b) with different lengths annuities in the transverse direction and being spaced in a longitudinal direction of the housing (3a) of the airbag safety device (3).  9. Vehicle seat according to claim 8, characterized in that the mechanical means for fixing the housing (3a) of the safety device (3) further comprises, on at least one of the fixing flanges (4a, 4b), an elastic tongue (11) curved and that the amount of the metal frame (2) of the motor vehicle seat has an opening (10) for locking the tongue (11) in the housing locking position (3a) the safety device (3).  10.-Vehicle seat according to claim 1, characterized in that the mechanical means for fixing the housing (3a) on the metal frame- <Desc / Clms Page number 16>  motor vehicle seat (2) consists of two electrical connectors (19a, 19b) secured to the housing (3a) of the safety device (3) each comprising a lateral opening (22a, 22b) and that the cooperating element secured of the metal frame (2) of the motor vehicle seat comprises at least one spring (21) having substantially parallel elastic branches capable of being introduced by elastic return into the lateral openings (22a, 22b) of the connectors (19a, 19b ), during the engagement of the connectors (19a, 19b) secured to the housing (3a) of the safety device (3) in through openings (12a, 12b) of the metal frame (2) of the seat on which are fixed electrical connection heads (14a, 14b) opposite the openings (12a, 12b), for the electrical connection of the connectors (19a, 19b) of the airbag safety device with cables (15,17) power supply and grounding.  11. Motor vehicle seat according to claim 10, characterized in that one of the connectors (19a) comprises two pads connected to firing tracks of the airbag safety device and a firing pad ground, the corresponding connection head (14a) comprising two corresponding power supply pins (16a, 16b) and a grounding pin (16c) and that the second connector (19b) comprises only at least one grounding pad to ground and the corresponding connection head (14b), a grounding cable or harness, the grounding paths connected to the corresponding pins of the first connector (19a) and the second connector (19b) comprising a switch capable of being actuated by the elastic parallel branches of the at least one spring (21), during engagement of the connector through the opening of the metal frame (2) of the seat and in the connection heads ( 14a, 14b), for reli er the grounding paths or cables connected to the connection heads, to at least one locking control circuit or to the connection of the housing (3a) of the safety device (3).