FR2878196A1 - Pivoting device for vehicle seat, has stop unit that cooperates with plate and is slidingly mounted with respect to plate for permitting adjustment of position of stop unit before immobilization of stop unit - Google Patents

Abstract

The device has a stop unit (25) that cooperates with a plate (8) and is slidingly mounted with respect to the plate for permitting adjustment of the position of the stop unit before immobilization of the stop unit. The plate (8) is connected to a plate (10) by a lock which is adapted for selectively locking and unlocking the plate (8) by pivoting with respect to the plate (10). Independent claims are also included for the following: (A) a vehicle seat comprising a pivoting device (B) a method for manufacturing a pivoting device.

Description

: L

  Swivel device for a vehicle seat and seat comprising such a device.

  The present invention relates to pivoting devices for vehicle seats and seats comprising such devices.

  More particularly, the invention relates to a pivoting device for a vehicle seat, comprising: - at least first and second armatures pivotally mounted relative to one another about a pivot axis, - a fixed stop member to the first armature and adapted to cooperate by abutment with the second armature thereby limiting a relative pivoting between the first armature and the second armature in a stop position, said stop member being connected to the first armature: É by a movable assembly adapted to allow adjustment of the stop position, E and by at least one rigid connection adapted to immobilize the abutment member with respect to the first armature after adjustment.

  Document DE-A-102 06 299 describes an example of such a device, in which the abutment member is connected to the first frame by an eccentric arrangement allowing adjustment of the abutment position of the second frame with respect to the first frame. After this adjustment, the stop member is secured to the first frame by riveting.

  This known device has the particular disadvantage of involving a relatively complex and expensive assembly to allow a unique adjustment, made once and for all.

  The present invention is intended to overcome this disadvantage.

  For this purpose, according to the invention, a device of the type in question is characterized in that the stop member is slidably mounted relative to the first frame to allow adjustment of the stop position before immobilization of said stop member.

  Thanks to these provisions, the mounting of the stop member on the first frame is simple and inexpensive.

  In various embodiments of the invention, one or more of the following arrangements may also be used: the first armature is connected to the second armature by a lock adapted to selectively lock and unlock the first frame pivotally relative to the second frame; the lock is adapted to lock the second armature in the abutment position with respect to the first armature; - The stop member has a divergent wedge shape at least in a substantially orthoradial direction relative to the pivot axis, said stop member being slidably mounted on the first frame substantially parallel to the pivot axis; the abutment member has at least first and second opposite edges substantially aligned in the orthoradial direction, the first edge being adapted to slide against at least one first guide edge belonging to the first frame and the second edge of the member; abutment being arranged to cooperate by abutment with the second armature in the abutment position; - The first edge of the stop member extends obliquely with respect to the pivot axis and the second edge of the stop member extends substantially parallel to the pivot axis; the second armature is disposed axially between the first armature and a closure flange fixed to said first armature, the first armature and the closure flange respectively having first and second recesses traversed by the abutment member, said first recess comprising the first guide edge and said second recess having a second guide edge against which slides the first edge of the stop member; - The stop member is slidably mounted on the first frame in a direction substantially perpendicular to the pivot axis; the abutment member is slidably mounted on the first frame in a direction substantially orthoradial with respect to the pivot axis; - The stop member comprises a main body bearing against the first armature parallel to the pivot axis, and a first tab engaged in a first slot in the first armature substantially in the orthoradial direction; the second armature is disposed axially between the first armature and a closure flange fixed to said first armature, the closure flange having a second slot substantially in correspondence with the first slot and the abutment member having a second tab engaged in the first armature; second slot; the stop member comprises a slit slidably engaged on at least one guiding relief integral with the first armature; the slot of the abutment member is internally lined with teeth and the guiding relief is partially crushed by penetrating between the teeth of the slot which thus constitute said rigid connection; - The stop member has a divergent wedge shape at least in a substantially orthoradial direction relative to the pivot axis, said stop member being slidably mounted on the first frame substantially radially relative to the pivot axis; the abutment member has at least first and second opposite edges substantially aligned in the orthoradial direction, the first edge of the abutment member being adapted to slide against at least a first guide edge belonging to the first frame and the second edge of the stop member being arranged to cooperate by abutment with the second armature in the abutment position; the first edge of the abutment member extends obliquely with respect to a direction radial to the axis of rotation and the second edge of the abutment member extends substantially parallel to the radial direction; - The second armature is disposed axially between the first armature and a closure flange fixed to said first armature, the abutment member being disposed between the first armature and the closure flange; - The pivoting device further comprises a hinge mechanism having third and fourth frames pivotally mounted relative to each other about the pivot axis, the hinge mechanism being adapted to allow a position adjustment angular between the third and fourth armatures, the second armature being fixed to the third armature; the second armature is disposed axially between the first armature and a closure flange fixed to said first armature, the first armature having a recess centered on the pivot axis through which the second armature is fixed to the third armature; the rigid connection comprises at least one weld made between the abutment member and the first armature; - The second armature is disposed axially between the first armature and a closure flange fixed to said first armature, the rigid connection further comprising a weld made between the abutment member and the closure flange.

  Moreover, the subject of the invention is also a vehicle seat comprising a seat and a backrest interconnected by at least one pivoting device as defined above, the first and second armatures being connected (directly or indirectly) to the seat. one on the record and the other on the seat.

  In addition, the invention also relates to an assembly intended to form a pivoting device as defined above, comprising: - at least first and second armatures pivotally mounted relative to one another around a pivot axis, - a stop member secured to the first armature and adapted to cooperate by abutment with the second armature thereby limiting a relative pivoting between the first armature and the second armature in an abutment position, said abutment member being connected to the first armature by a movable assembly adapted to allow adjustment of the stop position and being adapted to be connected to said first armature by at least one rigid connection for immobilizing the abutment member with respect to the first armature after adjustment, characterized in that the abutment member is slidably mounted relative to the first frame to allow adjustment of the abutment position before imm obilisation of said stop member.

  Finally, the subject of the invention is also a method for manufacturing a pivoting device as defined above, comprising at least the following steps: sliding the abutment member relative to the first frame to allow adjustment the abutment position, then immobilize said abutment member by connecting it to said first armature by at least one rigid connection.

  Other features and advantages of the invention will become apparent from the following description of four of its embodiments, given by way of non-limiting examples, with reference to the accompanying drawings.

  In the drawings: - Figure 1 is a schematic view of a vehicle seat that can be equipped with a pivoting device according to one embodiment of the invention; - Figure 2 is a perspective view of the side exposed to the inside the seat, a pivoting device that can equip the seat of Figure 1, in a first embodiment of the invention, - Figure 3 is a view similar to Figure 2, on which were removed the flange and the control lever to clearly show the inside of the pivoting device of FIG. 2; FIG. 4 is a perspective view of the pivoting device of FIG. 2, seen from its side exposed towards the outside of the seat, the articulation mechanism and the locking mechanism visible in FIGS. 2 and 3 having been removed for the sake of clarity, FIG. 5 is an elevational view corresponding to the perspective view of FIG. 4, FIG. an axial sectional view of the pivoting device of Figures 1 to 4, without its locking mechanism, the section being taken along the line VI-VI of Figure 5, - Figure 7 is a sectional view along the line VII-VII of Figure 6, - FIG. 8 is a perspective view of the inward facing side of the seat of a pivoting device according to a second embodiment of the invention that can equip the seat of FIG. 1, this pivoting device being represented without its mechanism. FIG. 9 is a view similar to FIG. 8, in which the closing flange of the pivoting device has been removed, FIG. 10 is a perspective view of the pivoting device of the FIG. FIG. 8, seen from its outwardly facing side of the seat; FIG. 11 is an elevation view corresponding to the perspective view of FIG. 10; FIG. 12 is an axial sectional view of the pivoting device of FIGS. Figures 8 to 10, the neck e being taken along line XII-XII of FIG. 11, FIG. 13 is a sectional view along the line XIII-XIII of FIG. 12, FIGS. 14 and 15 are views similar to FIGS. , for a third embodiment of the invention, FIG. 15 being partially exploded, FIGS. 16 and 17 are views similar respectively to FIGS. 2 and 3, for a fourth embodiment of the invention, FIG. 18 is a detail view of the abutment member of the pivoting device of FIGS. 16 and 17, FIG. 19 is a detailed view of FIG. 17 with the stop member in the mounted position, and - Figure 20 shows a detail XX of Figure 19.

  In the different figures, the same references designate identical or similar elements.

  Figure 1 shows a vehicle seat 1 30 having a seat 2 mounted on the floor 3 of the vehicle and a backrest 4 pivotally mounted on the seat 2 about a pivot axis Xl.

  The seat 1 may be provided with a handle 5, or any other control device, allowing a user to adjust the angular position of the backrest 4 by pivoting about the pivot axis Xl. In addition, the backrest 4 may further comprise a control lever 6 or other actuating member, arranged for example in the upper part of the backrest, allowing a user to fold the backrest 4 forward with a relatively large amplitude of pivoting, if necessary by unlocking slides 2a which can optionally connect the seat 2 to the floor 3 of the vehicle. In this case, the actuation of the lever 6 may allow for example the user to access the rear seats of a vehicle with three doors, or more generally to access more easily to a space behind the seat 1.

  As shown in FIGS. 2 to 5, the seat 1 may be provided with a pivoting device 7 which may comprise, for example: a first armature 8, for example in the form of a sheet metal flange which extends mainly perpendicularly to the pivot axis Xl and which may belong for example to the backrest frame 4 (or more generally to be connected to the backrest), - a closure flange 9 which may also be made of sheet metal and extend in parallel the first armature 8, the closure plate 9 being for example welded to the first armature 8, - a second armature 10 (see Figures 3 to 5) may for example be in the form of an intermediate plate flange s' extending perpendicularly to the pivot axis X1.

  This second armature 10 has an interior recess delimited by an inner edge 10a and a shoulder delimiting a circular outer edge 10b which journalled in a circular opening 8a of the first armature (see FIGS. 4 and 5), so as to allow relative pivoting between the first and second armatures 8, 10 around the pivot axis Xl.

  The second armature 10 is trapped axially between the first armature 8 and the closure flange 9.

  As can be seen in FIG. 5, the second armature 10 can be connected to a lateral flange 11 belonging to the armature of the seat 2, via a hinge mechanism 12.

  The hinge mechanism 12, known per se, is adapted to allow adjustment of the inclination of the backrest when the handle 5 is actuated. An example of a hinge mechanism that may be used in the context of the present invention is given in particular. in FRA-2,740,406.

  In the example shown in the drawings, the articulation mechanism 12 may comprise, for example: a third armature 13 that may be in the form of a plate flange parallel to the first and second armatures 8, 10 and integral with the second armature 10 (the third armature 13 may comprise for example pins 13a cooperating by interlocking with the inner edge 10a of the second armature and being further welded to said second armature), a fourth armature 14 being for example in the form a plate flange parallel to the third frame 13 and secured to the aforementioned flange 11 of the seat frame, and a crimped metal ring 15 or any other closure means delimiting with the third and fourth frames 13, 14 a closed housing that can contain a locking device such as for example that described in the document FR-A-2 740 406 mentioned above, or any other device lock or drive used conventionally in the articulation mechanisms of this type.

  As represented in FIGS. 2 and 3, the first and second armatures are interconnected by a locking mechanism adapted to selectively secure these two armatures together or allow relative pivoting between these two armatures around the pivot axis X1. .

  The locking mechanism 16 may comprise for example a latch 17 which may be in particular in the form of a cut sheet metal plate, parallel to the frames 8, 10 and extending longitudinally between two ends 17a, 17b.

  The latch 17 may be pivotally mounted relative to the first armature 8 around an axis of rotation X2 parallel to the axis X1. For this purpose, the end 17a of the lock may comprise, for example, journals 17c pivotally mounted in corresponding recesses of the first armature 8 and the closure flange 9.

  The latch 17 further comprises, at its second end 17b teeth 18 oriented towards the second frame 10 and adapted to penetrate respectively in notches 19 formed at the outer periphery of the second frame, so as to secure together the first and second frames 8, 10.

  The latch 17 is normally maintained in the locked position shown in FIG. 3, by a metal cam 20 which is pivotally mounted about an axis of rotation X 3 parallel to the axes X 1 and X 2 and which extends in the same plane as the lock 17.

  The cam 20 may comprise, for example, journals 20a which are pivotally mounted in corresponding recesses of the first armature 8 and of the closure flange 9. Said cam 20 is resiliently biased by a non-visible spring in the drawings towards the rest position visible in Figure 3, wherein said cam 20 bears on a support edge 17d of the latch 17 opposite the teeth 18.

  The cam 20 is also integral with a control lever 23 (Figure 2) which may include a pin 24 or similar to which can be fixed for example one end of a sheathed cable connected to the control lever 6, so to be able to pivot the control lever 23 and the cam 20 in the direction of the arrow 20b during the actuation of the control lever 6. The cam 20 then interferes with an unlocking finger 21 belonging to the latch 17, by rotating the latch 17 in the direction of the arrow 17e until disengage the teeth 18 of the notches 19, which allows a relative pivoting of the first frame 8 relative to the second frame 10, that is to say the folder 4 compared to the seat 2.

  When the latch 17 is unlocked, one can fold the backrest 4 forward, in particular to access the space at the rear of the seat 1 as explained above. During this movement, the teeth 18 of the latch 17 are opposite a smooth circular periphery 10c of the second frame, so that the latch 17 remains in the unlocked position. When the user then straightens back 4, the teeth: 18 slide against this periphery 10c until the first armature 8 is found in a stop position relative to the second armature 10, which corresponds to the initial position of the file 4.

  Once this abutment position is reached, the teeth 18 of the lock are in correspondence with the notches 19 of the second armature 10, so that the latch 17 returns to the locked position and again immobilizes the first flange 8 relative to the second flange 10.

  The aforementioned abutment position is defined by the contact between an abutment member 25 integral with the first frame 8 and a abutment 32 formed for example by a shoulder of the second frame 10 abutting the abutment member 25 in an orthoradial direction by relative to the pivot axis Xl.

  The abutment member 25 is slidably mounted relative to the first frame 8 and to the closure flange 9.

  In the first embodiment of the invention, as can be seen in particular in Figures 2, 3 and 7, the stop member 25 can be slidably mounted parallel to the pivot axis Xl and can have a shape wedge diverging at least in a substantially orthoradial direction relative to the pivot axis X1.

  More particularly, the abutment member 25 can pass through two recesses 28, 29 formed respectively in the closure flange 9 and in the first frame 8, substantially without play in the radial direction but with play in the orthoradial direction. In the radial direction, the abutment member 25 may have first and second opposite edges 30, 31, the first edge 30 being adapted to slide in abutment against a first guide edge 28a delimited by the recess 28 and a second edge guide 29a delimited by the recess 29, while the second edge 31 is adapted to abut against the abutment 32 of the second armature when the first and second armatures are in their relative abutment positions.

  More particularly, in the example shown in FIG. 7, the first edge 30 of the abutment member extends obliquely with respect to the pivot axis X1 while the second edge 31 extends parallel to the Xl axis, these two edges converging towards each other towards the first frame 8 from a first wide end 26 to a second narrower end 27, and the first and second guide edges 28a, 29a are arranged parallel to the first edge 30 of the stop member.

  During manufacture of the pivoting device 7, it is thus possible to slide the abutment member 25 parallel to the pivot axis X1 towards its narrow end 27, so that the second edge 31 of the abutment member comes apply against the abutment 32 of the second frame. The relative position of the abutment between the first armature 8 and the second armature 10 is thus perfectly defined, without leaving play between these two armatures in rotation about the axis X1. Once the abutment member 25 is in place, it is welded to the first frame 8 and / or the closure flange 9. This weld can be made in particular at the edges 28b, 29b of the recesses 28, 29 which extend in the orthoradial direction, and / or at the guiding edges 28a, 29a. These welds can be made by any known welding technique.

  In the second embodiment of the invention, shown in Figures 8 to 13, the first frame 8, the closure flange 9, the second frame 10, the hinge mechanism 12 and the locking mechanism 16 are identical or similar to the first embodiment and will not be described again here.

  This second embodiment is distinguished from the first embodiment by the stop member 33, which is here in the form of a sheet metal part extending substantially in an orthoradial plane with respect to the pivot axis X1 (This part may be either an arc centered on the axis Xl, or right, or other), slidably mounted relative to the first frame 8 substantially in said orthoradial direction.

  In the example shown in FIGS. 8 to 13, the abutment member 33 comprises: a main body 34 bearing sliding against the first armature 8 and against the closing flange 9, and first and second tabs; engaged in first and second slots 36, 37 formed respectively in the first frame 8 and in the closure flange 9 substantially in the orthoradial direction.

  The slots 36, 37 guide the sliding movement of the abutment member 33 in the orthoradial direction, thus allowing adjustment of the abutment position of the first armature 8 relative to the second armature 10 during manufacture of the pivoting device 7, as previously explained. Note that the slots 36, 37 may be in an arc centered on the pivot axis X1, as in the example shown, or in rectilinear shape, so that the sliding movement during adjustment can be a movement circular translation or a rectilinear translation movement. The adjustment in question makes it possible to bring an edge 38 of the abutment member 33 into contact with the abutment 32 of the second armature.

  After this adjustment, the abutment member 33 is welded to the first frame 8 and / or to the closure flange 9, for example at the longitudinal edges 39, 40 of the slots 37, 38.

  In the third embodiment of the invention, shown in FIGS. 14 and 15, the abutment shaft 41 has a divergent wedge shape in the orthoradial direction with respect to the pivot axis X1. The stop member 41 has first and second opposite edges 42, 43 which are aligned substantially in the orthoradial direction and which diverge radially outwards. The first edge 42 of the abutment member may for example extend obliquely relative to the radial direction to the axis of rotation X1, while the second edge 43 of the abutment member extends substantially parallel to the radial direction.

  The abutment member 41 can be slidably mounted, for example, between the first frame 8 and the closure flange 9, in a wedge-shaped channel 44 made for example by stamping the first frame 8. This channel 44 in the form of corner has a first guide edge 45 against which slides the first edge 42 of the stop member. In addition, the channel 44 is also delimited laterally by a second edge 46 which extends substantially radially, a certain clearance being provided between the second edge 43 of the stop member and the second edge 46 of the channel 44 so as to allow the stop member 41 to be moved radially inwards until the second edge 43 abuts against the abutment 32 of the second armature, after which the abutment member 41 is immobilized, for example, by welding with the first frame 8 and / or with the closure flange 9.

  In the fourth embodiment of the invention, shown in Figures 16 to 20, the stop member 47 is slidably mounted substantially in the orthoradial direction. In this fourth embodiment of the invention, the abutment member 47 is trapped between the first frame 8 and the closure flange 9. In addition, as can be seen in FIGS. 17 and 18, said abutment member 47 has a slot 48, advantageously provided with inner teeth 49. This slot is slidably mounted on at least one guide relief 50 made for example by stamping the first frame 8.

  In the example shown in the drawings, the slot 48 and the guide relief 50 each have a circular arc shape centered on the axis of rotation X1, so that the sliding of the stop member 47 is a circular sliding centered on the axis Xl. As a variant, the slot 48 and the guiding relief 50 could, if necessary, be rectilinear and oriented in the orthoradial direction.

  Thanks to these arrangements, it is possible to slide the abutment member 47 in the orthoradial direction so as to bring it into contact with the abutment 32, then the abutment member 47 is immobilized by any means, for example locally crushing the guide relief 50. This local crushing can be achieved, for example, by punching, by performing one or more punching 51 in the guide relief 50, as can be seen in Figures 19 and 20. These punching 51 cause a local creep of the material of the guide member 50 by at least partially penetrating this material in the teeth 49 of the stop member, which secures the abutment member 47 with the first frame 8. The aforementioned punching can be made, for example, through an opening 52 formed in the closure flange 9. Alternatively or in addition to this immobilization by the teeth 49, the stop member could also be welded to the first frame 8 and / or to the closure flange 9.

Claims (24)

  A pivoting device (7) for a vehicle seat, comprising: at least first and second armatures (8, 10) pivotally mounted relative to one another about a pivot axis (X1), an abutment member (25; 33; 41; 47) secured to the first armature (8) and adapted to cooperate by abutment with the second armature (10) thus limiting a relative pivoting between the first armature (8) and the second armature (25); armature (10) in an abutment position, said abutment member (25; 33; 41; 47) being connected to the first armature: E by a movable assembly adapted to allow adjustment of the stop position, E and by at least one rigid connection (28a, 29a; 39,40; 49) adapted to immobilize the stop member (25; 33; 41; 47) relative to the first armature (8) after adjustment, characterized in that the stop member (25; 33; 41; 47) is slidably mounted relative to the first armature (8) to allow adjustment of the position of stop before immobilization of said stop member.   2. Pivoting device according to claim 1, wherein the first armature (8) is connected to the second armature (10) by a latch (17) adapted to selectively lock and unlock the first armature (8) pivotally. relative to the second armature (10).   3. pivoting device according to claim 2, wherein the latch (17) is adapted to lock the second armature (10) in the abutment position relative to the first armature (8).   4. A pivoting device according to any one of the preceding claims, wherein the stop member (25) has a divergent wedge shape at least in a substantially orthoradial direction relative to the pivot axis (Xl), said member stopper slidably mounted on the first armature (8) substantially parallel to the pivot axis (X1).   Swivel device according to claim 4, wherein the stop member (25) has at least first and second opposite edges (: 30, 31) substantially aligned in the orthoradial direction, the first edge (30) of the stop member being adapted to slide against at least one first guide edge (29a) belonging to the first armature (8) and the second edge (31) of the stop member being arranged to cooperate by abutment with the second armature ( 10) in the stop position.   The pivoting device according to claim 5, wherein the first edge (30) of the stop member extends obliquely with respect to the pivot axis (X1) and the second edge (31) of the member abutment extends substantially parallel to the pivot axis.   7. pivoting device according to claim 5 or claim 6, wherein the second armature (10) is disposed axially between the first armature (8) and a closure flange (9) fixed to said first armature, the first armature and the closure flange respectively having first and second recesses (29, 28) traversed by the abutment member (25), said first recess (29) having the first guide edge (29a) and said second recess (28) having a second guide edge (28a) against which slides the first edge (30) of the stop member.   8. A pivoting device according to any one of claims 1 to 3, wherein the stop member (33; 41; 47) is slidably mounted on the first armature (8) in a direction substantially perpendicular to the pivot axis. (X1).   9. pivoting device according to claim 8, wherein the stop member (33) is slidably mounted on the first armature (8) in a direction substantially orthoradial with respect to the pivot axis (Xl).   10. Swivel device according to claim 9, wherein the stop member (33) comprises a main body (34) bearing against the first armature (8) parallel to the pivot axis (X1), and a first leg (35) engaged in a first slot (36) formed in the first frame (8) substantially in the orthoradial direction.   11. A pivoting device according to claim 10, wherein the second armature (10) is disposed axially between the first armature (8) and a closure flange (9) fixed to said first armature, the closure flange (9) having a second slot (37) substantially in correspondence with the first slot (36) and the stop member having a second leg (35) engaged in the second slot (37).   12. pivoting device according to claim 9, wherein the stop member (47) comprises a slot (48) slidably engaged on at least one guide relief (50) integral with the first frame (8).   13. A pivoting device according to claim 12, wherein the slot (48) of the stop member is lined internally with teeth (49) and the guide relief (50) is partially crushed by penetrating between the teeth (49) of the slot which thus constitute said rigid connection.   Swivel device according to claim 8, wherein the stop member (41) has a divergent wedge shape at least in a direction substantially orthoradial with respect to the pivot axis (Xl), said stop member being mounted sliding on the first armature (8) substantially radially relative to the pivot axis (X1).   15. A pivoting device according to claim 14, wherein the stop member (41) has at least first and second opposite edges (42, 43) substantially aligned in the orthoradial direction, the first edge (42) of the member stopper being adapted to slide against at least a first guide edge (45) belonging to the first armature (8) and the second edge (43) of the abutment member being arranged to cooperate by abutment with the second armature (10). ) in the stop position.   16. A pivoting device according to claim 15, wherein the first edge (42) of the stop member extends obliquely with respect to a direction radial to the axis of rotation (X1) and the second edge (43). the stop member extends substantially parallel to the radial direction.   17. Swivel device according to any one of claims 12 to 16, wherein the second armature (10) is disposed axially between the first armature (8) and a closure flange (9) fixed to said first armature, the organ stopper (41; 47) being disposed between the first armature (8) and the closure flange (9).   Swivel device according to any one of the preceding claims, further comprising a hinge mechanism (12) having third and fourth armatures (13, 14) pivotally mounted relative to each other around the pivot axis (Xl), the hinge mechanism being adapted to allow adjustment of angular position between the third and fourth armatures, the second armature (10) being fixed to the third armature (13).   19. Swivel device according to any one of the preceding claims, wherein the second armature (10) is disposed axially between the first armature (8) and a closure flange (9) fixed to said first armature (8), the first armature having a recess (8a) centered on the pivot axis (Xl), through which the second armature (10) is fixed to the third armature (13).   20. Swivel device according to any one of the preceding claims, wherein the rigid connection comprises at least one weld (29a, 29b, 39) formed between the stop member (25; 33; 41; 47) and the first armature (8).   21. A pivoting device according to claim 20, wherein the second armature (10) is arranged axially between the first armature (8) and a closure flange (9) fixed to said first armature, the rigid connection further comprising a weld ( 28a, 28b, 40) made between the sealing member (25; 33; 41; 47) and the closing flange (9).   22. Vehicle seat comprising a seat (2) and a backrest (4) interconnected by at least one pivoting device (7) according to any one of the preceding claims, the first and second armatures (8, 10) being connected one on the record and the other on the seat.   23. An assembly for forming a pivoting device according to any one of claims 1 to 21, comprising: - at least first and second armatures (8, 10) pivotally mounted relative to each other around a pivot axis (X1), - an abutment member (25; 33; 41; 47) secured to the first armature (8) and adapted to cooperate by abutment with the second armature (10) thereby limiting a relative pivoting between the first armature (8) and the second armature (10) in an abutment position, said abutment member (25; 33; 41; 47) being connected to the first armature by a movable assembly adapted to allow adjustment of the stop and being adapted to be connected to said first armature by at least one rigid connection (28a, 29a; 39, 40) for immobilizing the abutment member (25; 33; 41; 47) relative to the first armature (8; ) after adjustment, characterized in that the stop member (25; 33; 41; 47) is mounted on the neck smoothing relative to the first armature (8) to allow adjustment of the stop position before immobilization of said stop member.   24. A method of manufacturing a pivoting device according to claim 1, comprising at least the following steps: sliding the stop member (25; (8) to allow adjustment of the stop position, - then immobilizing said abutment member by connecting it to said first armature by at least one rigid connection (28a, 29a; 39, 40; 49).