VEHICLE SEAT SET

Abstract

A swivel assembly (18) for a vehicle seat (10) comprising a lower plate (30) having at least one first hole (32); an upper plate (20) mounted to pivot relative to the lower plate (30) about a first axis (A1) and comprising at least one second hole (22); a housing (28) delimited in the direction of the first axis (A1) by the upper plate (20) and the lower plate (30); at least one electrical harness (50) comprising at least one electrical cable, the electrical harness (50) extending through said at least one first hole (32) of the lower plate (30) and through said at least one second hole (22) of the upper plate (20), an intermediate portion (52) of the electrical cable being received in said housing, said intermediate portion (52) forming at least one loop about the first axis (A1). (See Figure 3 for more details.)

Description

Description Title of the invention: VEHICLE SEAT ASSEMBLY Technical field

[0001] — The present description relates to a vehicle seat assembly, in particular with vertical pivot function. This description also relates to a seat comprising such an assembly. Prior art

[0002] — In the following description, when referring to position qualifiers absolute, such as the terms "front", "back", "up", "down", "left", "right ", etc., or relative, such as the terms "above", "below", "upper", " lower", etc., or to orientation qualifiers, such as "horizontal", "vertical", etc. reference is made, unless otherwise specified, to the orientation of the figures or the seat 10 in its normal position of use.

[0003] = In the following, the longitudinal direction X means the longitudinal direction X of the seat 10. The longitudinal direction X of seat 10 is considered to be the same as the longitudinal direction X of the motor vehicle in which the seat 10 is mounted. This longitudinal direction X corresponds to the normal direction of advancement FW of the vehicle. The longitudinal direction X is preferably horizontal. The direction transverse ŸY is the transverse Y direction of seat 10. The transverse Y direction of seat 10 thus corresponds to the transverse direction Ÿ or lateral direction of the vehicle au- car. This transverse direction Ÿ corresponds to a direction perpendicular to the normal direction of travel of the vehicle. The transverse direction Y is horizontal preference. Finally, the vertical direction Z is the direction perpendicular to the direction to the longitudinal direction and the transverse direction Y. The direction vertical Z coincides with the direction of the Earth's gravitational field.

[0004] — In transport vehicles, it has already been proposed to be able to rotate a seat 10 passengers to obtain a lounge-type configuration, i.e. at least one seat 10 facing in a position other than forward (represented by arrows S and S' at the Figure 1b). It has already been proposed to use a pivoting movement vertical to facilitate the entry and exit of passenger(s) in a vehicle when a Conventional wide access through the door is not available.

[0005] = Furthermore, in the context of situations of delegation of conduct more or less advances using autonomous driving functions of the vehicle, not only the passengers but also the driver may be led to prefer a position of the seat 10 that is not directly forward facing, and seat orientations 10 varied and very different can prevail inside the cabin. As shown in [Fig.2], a vehicle seat 10 is thus known, with a vertical axis pivoting function, the pivoting assembly 100 of which comprises a base 104 configured to be connected to the floor of the vehicle directly or via longitudinal slides, and a rotating crown 102 mounted on the base by means of an articulation mechanism 106, interposed between the base and the rotating crown. The seat 10 further comprises a seat frame 12 of the seat 10 connected to the rotating crown 102. It is also known that the seat 10 may comprise one or more control devices 16 for each controlling a functional device associated with a functionality, for example adjusting the inclination of a backrest 14 of the seat 10 relative to the seat 12, a massage function, opening and / or closing a window of the vehicle in which the seat 10 is located, switching on and / or off a light of the vehicle in which the seat 10 is located, etc. The control device(s) 16 may be directly embedded in the seat 10, for example accessible at the level of a seat upholstery 12, a backrest upholstery 14 or an armrest. For this purpose, it is necessary to provide an electrical connection between each control device 16 and the corresponding functional device, or even with an on-board computer of the vehicle.Furthermore, it is also necessary to provide an electrical connection with a power supply device, such as an electric battery, for each functional device and for some, or even all, of the control devices. These electrical connections are made by means of several electrical cables. A bundle of electrical cables thus extends between the floor of the vehicle and the frame of the seat 10. However, in the case of a seat 10 with a vertical pivoting function, the pivoting assembly 100 constitutes an obstacle to the passage of the electrical harness. In addition, the pivoting of the seat 10 causes shearing and / or twisting of the electrical cables which can lead to their damage or even breakage. Summary According to a first aspect, there is provided a pivoting assembly for a vehicle seat comprising: A lower tray configured to be connected to a vehicle floor, the lower plate comprising at least one first hole; an upper tray pivotally mounted relative to the lower tray around of a first axis, the upper plate comprising at least a second hole, a housing delimited in the direction of the first axis by the upper plate and the lower tray; at least one electrical harness which comprises at least one electrical cable, the electrical harness extending through said at least one first hole of the lower tray and through said at least one second hole in the tray upper, an intermediate portion of the electric cable being received in said housing, said intermediate portion forming at least one loop around the first axis, said lower plate being configured to support said less one loop. Winding the intermediate portion of the wiring harness around the first axis makes it possible to avoid shearing of the wiring harness when the upper plate rotates around the first axis relative to the lower plate. Indeed, when the upper plate rotates around the first axis relative to the lower plate, the wiring harness can be wound or unwound depending on the direction of rotation of the upper plate, thus avoiding a shearing effect on it, and in particular on each of the electrical cables it comprises. Premature wear or damage to the wiring harness is thus avoided. The fact that the intermediate portion of the electrical harness is received in the housing makes it possible to maintain the winding of the electrical harness around the first axis. Also, remarkably, the housing receiving the intermediate portion of the electrical harness is obtained by directly connecting the upper plate to the lower plate. In other words, the assembly of said at least one loop of the electrical harness can be directly obtained by assembling only two elements, namely the upper plate and the lower plate. Such a pivoting assembly is therefore advantageously quick and easy to assemble. The direction of the first axis may coincide with the vertical direction. The orientation qualifiers "radial" or "circumferential" are defined, unless otherwise specified, by reference to the first axis. A radial direction is a direction perpendicular to the direction of the first axis. A circumferential direction, at a point distant from the first axis, corresponds to a direction perpendicular to the directions of the first axis and radial. Furthermore, unless otherwise specified, the adjectives "inner", "inner", "outer" and "outer" are used in reference to a radial direction so that the inner / inner part, i.e. radially inner / inner, of an element is closer to the first axis than the outer / outer part, i.e. radially outer / outer, of the same element. The lower tray can be configured to be connected directly to the vehicle floor or via a slide mechanism suitable for moving the seat in a longitudinal direction. The electrical harness may comprise a sheath in which said at least one electrical cable is received. Said at least one electrical cable may be insulated. The pivoting of the upper plate around the first axis relative to the lower plate is at least equal to 90°, preferably at least equal to 180°, and even more preferably at least equal to 360°; in certain configurations a multi-turn solution can be obtained. The lower tray and / or the upper tray can each be made of one material, i.e. monobloc. The intermediate portion can form between 1 and 3 loops around the first axis. The electrical harness can have a diameter of 10 mm. The electrical harness can have a diameter less than or equal to 20 mm. A first end portion of the harness may be located below the lower plate. The first end portion may emerge from the first hole, in particular downwards. A second end portion of the electrical harness may be located above the upper plate. The second end portion may emerge from the second hole, in particular upwards. Said at least one first hole and said at least one second hole may each be arranged at a distance from the first axis. The first end portion and the second end portion are thus at a distance from the first axis. This makes it possible to avoid twisting of the electrical harness when the upper plate rotates around the first axis relative to the lower plate. In other words, offsetting the first end portion and the second end portion from the first axis makes it possible to ensure that the harness does not twist on itself, in particular from the first end portion and the second end portion. In other words, the first end portion and the second end portion may each be eccentric from the first axis. The electrical harness may be attached to a side edge of the first hole and / or to a side edge of the second hole. It was found that this facilitates the winding and unwinding of the bundle around the first during significant rotation of the upper platen relative to the lower platen. One or more electrical harness connectors may be provided connected to the electrical harness. A electrical harness connector may have dimensions less than or equal to 115mm x 60mm x 25mm. Said at least one first hole and said at least one second hole may be sized to allow the passage of a electrical harness connector. The pivoting assembly may comprise at least one articulation mechanism interposed between the lower plate and the upper plate and by means of which the upper plate is pivotally mounted relative to the lower plate around the first axis, the articulation mechanism being arranged between the lower plate and the upper plate along the direction of the first axis at a central area which is centered on the first axis, said at least one loop of the intermediate portion of the electrical harness being wound around the articulation mechanism. The arrangement of the hinge mechanism in the central area of ​​the housing allows for a more compact seat. In addition, such an arrangement proves to be more robust. The housing may be annular about the first axis. The articulation mechanism may be located in the center of said housing. The mechanism may radially delimit said housing inside. The hinge mechanism may be configured to lock the upper plate from pivoting about the first axis relative to the lower plate. The articulation mechanism may be entirely enclosed in a cylinder. The cylinder containing the articulation mechanism may be of revolution around the first axis having a diameter of less than 120 mm, preferably a diameter of less than 100 mm, or even less than 80 mm. The articulation mechanism may be of the continuous or discontinuous type. The articulation mechanism may comprise a first flange and a second flange. The first flange of the articulation mechanism may be integral with the lower plate and the second flange of the articulation mechanism may be integral with the upper plate. The articulation mechanism may be of the discontinuous type. The articulation mechanism may be of the discontinuous type with toothed locking grains. The articulation mechanism may then be non-motorized. The pivoting assembly may comprise an unlocking control lever intended to be maneuvered by a user of the seat. This forms an inexpensive and reliable solution for providing a seat with a vertical pivoting function. The first flange may comprise a first toothed crown and the second flange may comprise guides capable of receiving and guiding locking grains. The locking grains may each have a toothing which is engaged with the first toothed crown in a rest state of the articulation mechanism and which is spaced from the first toothed crown in an activated unlocked state of the articulation mechanism. The articulation mechanism may be of the continuous hypocycloidal type with an eccentric cam. The pivot assembly may include an electric motor connected to the eccentric cam and configured to selectively rotate the eccentric cam. Such a hypocycloid articulation mechanism is inexpensive, since they are produced in large quantities for motorized adjustment backrest articulations. The motor can be positioned below the lower plate. The motor can be positioned below the articulation mechanism. The motor can be integral with the lower plate. This allows for a moderate seat thickness, with the motor located in a technical area below the articulation mechanism. A motor output shaft can be centered on the first axis. According to a particular arrangement, the first flange may comprise a first toothed crown which comprises first teeth and the second flange may comprise a second toothed crown which comprises second teeth. The first toothed crown and the second toothed crown may permanently mesh with each other over at least one angular sector under the effect of the eccentric control cam. The first and second toothed crowns may thus form a hypocycloidal interface, according to which the center of the second rotating crown is displaced relative to the center of the first toothed crown when the control cam rotates. According to a particular arrangement, an Oldham joint principle transmission may be provided to compensate for the eccentric effect generated by the hypocycloid articulation mechanism with eccentric cam, the Oldham joint principle transmission being interposed between the articulation mechanism and the upper plate. Advantageously, the articulation mechanism may be non-reversible, namely a significant torque exerted between the first and second flanges cannot cause a relative movement of the first flange with respect to the second flange, in the absence of rotation of the eccentric cam caused by the rotation of the motor. Thus, when the motor is not controlled, even if a torque is exerted on the seat, no pivoting of the seat occurs. The articulation by the continuous or discontinuous articulation mechanism as described above is said to be single-stage as opposed to a double-stage articulation as described below. According to the alternative of a double-stage articulation, a first articulation stage and a second articulation stage may be provided, respectively comprising a first articulation mechanism and a second articulation mechanism 40b), each being of the continuous hypocycloidal type as described above. The first articulation mechanism and the second articulation mechanism may be arranged in series. The second flange of the first articulation mechanism may be integral with the first Mask of the second articulation mechanism. Also, the first flange of the first articulation mechanism may be integral with the lower plate and the second flange of the second articulation mechanism may be integral with the upper plate. The second articulation mechanism can be configured to compensate for the eccentric effect of the first articulation mechanism. In other words, the eccentric effect of the second articulation mechanism is 180° out of phase around the first Al relative to the eccentric effect of the first articulation mechanism. As a result, the seat can rotate in a perfectly circular motion without any eccentric or hypocycloid parasitic effect. The pivot assembly may include a centering device for centering the upper platen on the first axis relative to the lower platen. The upper plate can thus be assembled to the lower plate in a manner centered on the first axis, without the need for a centering operation. Such a self-centering pivot assembly is faster to implement. The pivoting assembly may comprise at least one flange securely connected to the upper plate, said at least one flange comprising a first wall having a generally cylindrical shape, preferably of circular arc section, around the first axis. The centering device may be formed by the first wall of said at least one flange. The first wall of said at least one flange may be radially opposite a radially external face of the lower plate. The first wall of said at least one flange may act as a guide wall for pivoting the upper plate relative to the lower plate. The pivot assembly may comprise n flanges with n an even integer greater than or equal to 2, the flanges being diametrically opposed two by two with respect to the first axis, the first wall of each flange having a circular arc section. The circular arc section of each flange may extend angularly over a range between 25° and 35°. The pivot assembly is thus more compact. The pivot assembly may include a retention device for retaining the upper platen to the lower platen in the direction of the first axis. A retention device prevents the upper plate from lifting in the event of an accident, and therefore maintains the cohesion of the seat even in the event of a significant impact. Said at least one flange may comprise a first rim projecting from the first wall radially inwards relative to the first axis, a peripheral portion of the lower plate being interposed in the direction of the first axis between the first rim of said at least one flange and the upper plate to form the retention device. Said at least one flange may comprise a second rim extending from the first wall radially outwardly relative to the first axis. The second rim of said at least one flange may be fixed to the upper plate, for example by at least one rivet. The first wall of said at least one flange may extend in the direction of the first axis between a lower end and an upper end. The first flange may project from the lower end of the first wall. The second flange may project from the upper end of the first wall. According to a second aspect, which can be considered independently of the first aspect and in which the electrical harness can be omitted, there is provided a vehicle seat assembly comprising the lower plate configured to be connected to a vehicle floor, the upper plate pivotally mounted relative to the lower plate about a first axis and an annular guide device comprising a plurality of rolling members interposed between the lower plate and the upper plate and located at a distance from the first axis, and in which an adjustment system is provided suitable for adjusting the distance in the direction of the first axis between the lower plate and the upper plate, in particular radially at the level of the rolling members. The adjustment system makes it possible to avoid play between the rolling elements and one and / or the other of the plates which causes noise or to avoid crushing of the rolling elements in the direction of the first axis between the upper plate and the lower plate. The adjustment system may comprise a first tubular wall around the first axis secured directly or indirectly to the lower plate and a second tubular wall around the first axis secured directly or indirectly to the upper plate, one of the first tubular wall and the second tubular wall being at least partly received by form-fitting in the other of the first tubular wall and the second tubular wall. The first tubular wall and the second tubular wall may each be cylindrical in revolution. The first tubular wall and the second tubular wall may be able to slide relative to each other in the direction of the first axis before they are secured together, thus allowing the distance to be adjusted in the direction of the first axis between the lower plate and the upper plate. For this purpose, the adjustment between the first tubular wall and the second tubular wall may be with a clearance, preferably small. The first tubular wall and the second tubular wall may be able to slide relative to each other in an intermediate configuration of the pivoting assembly. In an assembled and final configuration of the pivot assembly, the first tubular wall may be securely connected to the second tubular wall, in particular by welding. According to a first embodiment, a single-stage articulation may be provided as described with reference to the first aspect. In particular, the assembly according to the first embodiment of the second aspect may comprise the articulation mechanism, continuous or discontinuous, as described above in relation to the first aspect. The articulation mechanism may be interposed between the lower plate and the upper plate and by means of which the upper plate is pivotally mounted relative to the lower plate around the first axis, the articulation mechanism being arranged at a central zone centered on the first axis. The articulation mechanism may comprise a first flange and a second flange. The first flange of the articulation mechanism may be directly or indirectly secured to the lower plate and the second flange of the articulation mechanism may be directly or indirectly secured to the upper plate. According to the first embodiment, the adjustment system can be interposed between the articulation mechanism and a first plate among the lower plate and the upper plate. According to a first possibility, the adjustment system can be interposed between the lower plate and the first flange. According to a second possibility, the adjustment system can be interposed between the upper plate and the second flange. The first tubular wall may be connected to the first plate among the lower plate and the upper plate. By "connected", it is understood that the first tubular wall may be fixed by any suitable fixing means or integral with the first plate. The second tubular wall may be connected to the flange of the articulation mechanism which is integral with the first plate. By "connected", it is understood that the second tubular wall may be fixed by any suitable fixing means or integral with the corresponding flange. According to a preferred embodiment of the first embodiment, the adjustment system may comprise an annular member which comprises the second tubular wall. The annular member may be fixed to the corresponding flange of the articulation mechanism, in particular by any suitable fixing means, preferably by welding. The annular member may comprise an annular rim extending radially inward from the second tubular wall. The rim may be connected, preferably by welding, to the corresponding flange of the articulation mechanism. The second tubular wall may wholly or partially surround the articulation mechanism. The joining of the first tubular wall and the second tubular wall allows the joining of the first plate to the corresponding flange of the articulation mechanism. According to a second embodiment, a double-stage articulation may be provided as described with reference to the first aspect. In particular, the assembly according to the second embodiment of the second aspect may comprise a first articulation mechanism and a second articulation mechanism, both continuous, as described above in relation to the first aspect. The articulation mechanisms may be arranged in series by being interposed between the lower plate and the upper plate and by means of which the upper plate is pivotally mounted relative to the lower plate around the first axis. The articulation mechanisms may be arranged at a central zone centered on the first axis. The articulation mechanisms may each comprise a first flange and a second flange. The first flange of the first articulation mechanism may be directly or indirectly secured to the lower plate and the second flange of the second articulation mechanism may be directly or indirectly secured to the upper plate. According to the second embodiment, the adjustment system can be interposed between the lower plate and the first articulation mechanism or between the upper plate and the second articulation mechanism. According to a first possibility, the adjustment system can be interposed between the lower plate and the first flange of the first articulation mechanism. According to a second possibility, the adjustment system can be interposed between the upper plate and the second flange of the second articulation mechanism. According to a third embodiment, a double-stage articulation may be provided as described with reference to the first aspect. In particular, the assembly according to the second embodiment of the second aspect may comprise a first articulation mechanism and a second articulation mechanism, both continuous, as described above in relation to the first aspect. The articulation mechanisms may be arranged in series by being interposed between the lower plate and the upper plate and by means of which the upper plate is pivotally mounted relative to the lower plate around the first axis. The articulation mechanisms may be arranged at a central zone centered on the first axis. The articulation mechanisms may each comprise a first flange and a second flange. The first flange of the first articulation mechanism may be secured directly or indirectly to the lower plate and the second flange of the second articulation mechanism may be secured directly or indirectly to the upper plate. According to the third embodiment, the adjustment system can be interposed between the first articulation mechanism and the second articulation mechanism. The first tubular wall may be connected to the second flange of the first articulation mechanism. By "connected" is meant that the first tubular wall may be fixed by any suitable fixing means or made integrally with the second flange of the first articulation mechanism. The second tubular wall may be connected to the first flange of the second articulation mechanism. By "connected", it is understood that the second tubular wall can be fixed by any suitable fixing means or made integrally with the first flange of the second articulation mechanism. It is understood that in this case, the second flange of the first articulation mechanism can be secured to the first flange of the second articulation mechanism via the first tubular wall and the second tubular wall. According to a preferred embodiment of the third embodiment, the adjustment system may comprise a first annular member which comprises the first tubular wall. The first annular member may be fixed to the second flange of the first articulation mechanism, in particular by any suitable fixing means, preferably by welding. The first annular member may comprise a first annular rim extending radially inward from the first tubular wall. The first rim may be connected, preferably by welding, to the second flange of the first articulation mechanism. According to a preferred embodiment of the third embodiment, the adjustment system may comprise a second annular member which comprises the second tubular wall. The second annular member may be fixed to the first flange of the second articulation mechanism, in particular by any suitable fixing means, preferably by welding. The second annular member may comprise a second annular rim extending radially inward from the second tubular wall. The second rim may be connected, preferably by welding, to the first flange of the second articulation mechanism. The rolling members, further from the axis than the articulation mechanism, provide a significant lever arm to counteract tilting forces exerted on the seat, in particular the application of a horizontal force on the top of the seat back. Alternatively, the rolling elements can be balls. Since balls are a standard supply, a low-cost solution is obtained for a large-diameter annular guide, if necessary by using a ball guide cage. The balls can be held in an annular cage. Alternatively, the rolling elements can be rollers. The rollers are each mounted on an axle fixed either to the lower plate or to the upper plate. The lower plate and the upper plate may each include an annular portion forming a raceway on which the rolling members can roll. I] is also proposed a method of assembling the pivot assembly according to the second aspect as described above. The method comprising: provide a pivot assembly as described above, wherein the first tubular wall and the second tubular wall are at least partly received by complementarity of form one in the other among the first tubular wall and the second tubular wall being able to slide one relative to the other according to the direction of the first axis; move the lower tray relative to the upper tray following the direction of the first axis by sliding of the first tubular wall and the second tubular wall relative to each other to obtain a distance according to the direction of the first axis between the lower plate and the plate upper which allows adjustment of the rolling elements between the plate lower and upper tray; secure the first tubular wall to the second tubular wall, preferably by welding. The adjustment of the rolling members between the lower plate and the upper plate may be without tightening in the direction of the first axis and / or without play in the direction of the first axis. In other words, the rolling members may be interposed between the lower plate and the upper plate may be without tightening in the direction of the first axis and / or without play in the direction of the first axis. The first aspect and the second aspect of the present description may be combined. The first tubular wall and / or the second tubular wall may delimit, radially inwardly relative to the first axis, said housing of the pivoting assembly. Said at least one loop formed by the intermediate portion of the electrical harness may be wound around the first tubular wall and / or the second tubular wall. Also provided is a vehicle seat comprising a swivel assembly as described and a seat base which includes a seat frame, wherein the seat base frame is connected to the upper plate, either directly or via a raising mechanism. The seat may comprise one or more control devices for each controlling a functional device associated with a functionality, for example adjusting the inclination of a backrest of the seat relative to the seat, a massage function, opening and / or closing a window of the vehicle in which the seat is located, switching on and / or off a light of the vehicle in which the seat is located, etc. Said at least one electrical cable of the electrical harness may be intended for an electrical connection between one of the control devices and the corresponding functional device, or even with an on-board computer of the vehicle. Also, said at least one electrical cable of the electrical harness may be intended for an electrical connection between at least one of the control or functional devices with an electrical power supply member, such as an electric battery. According to Brief description of the drawings Other characteristics, details and advantages will appear on reading the detailed description below, and on analyzing the attached drawings, in which: [Fig. 1] comprises Figures 1 A and 1B. Figures 1 A and AB show a seat with vertical pivoting function according to the known state of the art. [Fig.2] represents a perspective view of a pivot assembly of the seat of [Fig.1]. [Fig.3] shows a perspective view of a first aspect of a swivel assembly for a seat with vertical swivel function according to the present description. [Fig.4] represents an exploded perspective view of the pivot assembly of [Fig.3]. [Fig.5] shows another exploded perspective view of the pivot assembly of [Fig.3]. [Fig.6] represents a perspective and sectional view of a first embodiment of a second aspect of the pivot assembly for a seat with vertical pivot function according to the present description. [Fig.7] shows a perspective and sectional view of a second embodiment of a second aspect of the pivot assembly for a seat with vertical pivot function according to the present description. [Fig.8] shows a sectional view of a detail of the pivot assembly according to the first aspect and the second aspect of the present description. Description of the embodiments Reference is first made to Figures 3 to 5 and 8 to describe a first aspect of a swivel assembly 18 for a vehicle seat 10 with vertical swivel function. The seat 10 may comprise a seat base 12 of the seat 10 which comprises a seat frame 12. The seat 10 may comprise one or more control devices 16 for each controlling a functional device associated with a functionality, for example adjusting the inclination of a backrest 14 of the seat 10 relative to the seat base 12, a massage function, opening and / or closing a window of the vehicle in which the seat 10 is installed, switching on and / or off a light of the vehicle in which the seat 10 is installed, etc. The pivot assembly 18 includes a lower tray 30 configured to be connected to a vehicle floor. The lower tray 30 may be configured to be connected directly to the vehicle floor or indirectly via a slide mechanism adapted to move the seat 10 in a longitudinal direction. The lower plate 30 comprises a plurality of first holes 32, in this case four first holes 32. The pivoting assembly 18 comprises an upper plate 20 pivotally mounted relative to the lower plate 30 about a first axis A1. The possible pivoting of the upper plate 20 about the first axis A1 relative to the lower plate 30 may be at least equal to 90°, preferably at least equal to 180°, and even more preferably at least equal to 360°; in certain configurations, a multi-turn solution may be obtained. The upper plate 20 may be connected to the seat frame 12 of the seat, directly or via a mechanism for raising the seat frame 12. The upper plate 20 comprises a plurality of second holes 22, in this case four second holes 22. The lower plate 30 and the upper plate 20 are here each made in one piece, i.e. monobloc, which facilitates the assembly of the pivoting assembly 18. The direction of the first axis A1 here coincides with the vertical direction Z. The orientation qualifiers "radial" or "circumferential" are defined, unless otherwise specified, by reference to the first axis A1. A radial direction is a direction perpendicular to the direction of the first axis A1. A circumferential direction, at a point distant from the first axis A1, corresponds to a direction perpendicular to the directions of the first axis A1 and radial. Furthermore, unless otherwise specified, the adjectives "inner", "inner", "outer" and "outer" are used with reference to a radial direction so that the inner / inner part, i.e. radially inner / inner, of an element is closer to the first axis A1 than the outer / outer part, i.e. radially outer / outer, of the same element. The lower plate 30 and the upper plate 20 define a housing 28. The housing 28 is delimited in the direction of the first axis A1 by the upper plate 20 and the lower plate 30. The pivoting assembly 18 comprises at least one articulation mechanism 40 interposed between the lower plate 30 and the upper plate 20 and by means of which the upper plate 20 is pivotally mounted relative to the lower plate 30 about the first axis A1. The articulation mechanism 40 is also here configured to block the pivoting of the upper plate 20 about the first axis A1 relative to the lower plate 30, when it is in a locked configuration which may be the default rest configuration. On the other hand, in an unlocked configuration of the articulation mechanism 40, the upper plate 20 can pivot about the first axis A1 relative to the lower plate 30, by a manual or motorized action and by means of the articulation mechanism as described in more detail below. after. The articulation mechanism 40 is arranged between the lower plate 30 and the upper plate 20 in the direction of the first axis A1 at a central zone which is centered on the first axis A1. The arrangement of the articulation mechanism 40 in the central zone of the housing makes it possible to obtain a more compact seat 10. Furthermore, such an arrangement proves to be more robust. The articulation mechanism 40 is located in the center of the housing 28. In particular, the mechanism radially delimits said housing 28 inside. The housing 28 is therefore here annular around the first axis A1. Remarkably, the articulation mechanism 40 may be entirely comprised in a cylinder. The cylinder containing the articulation mechanism 40 may be of revolution around the first axis A1 having a diameter less than 120 mm, preferably a diameter less than 100 mm, or even less than 80 mm. According to the example illustrated in Figures 3 to 5, the articulation by the articulation mechanism 40 is said to be single-stage as opposed to a double-stage articulation as described below with reference to the second aspect of the pivot assembly 18 of the present description. However, an embodiment of the pivot assembly 18 according to the first aspect in which a double-stage articulation is provided is not excluded. The articulation mechanism 40 may be of the continuous or discontinuous type. The articulation mechanism 40 may comprise a first flange 41 and a second flange 42. The first flange 41 of the articulation mechanism 40 may be integral with the lower plate 30 and the second flange 42 of the articulation mechanism 40 may be integral with the upper plate 20. The first flange 41 and the second flange 42 of the articulation mechanism 40 of a single-stage articulation are more particularly visible in [Fig. 6] relating to the second aspect of the pivot assembly 18 which is described in more detail below. The articulation mechanism 40 may be of the discontinuous type with toothed locking grains. The articulation mechanism 40 may then be non-motorized, i.e. manually operated. The pivoting assembly 18 may comprise an unlocking control lever intended to be maneuvered by a user of the seat 10. This forms an inexpensive and reliable solution for providing a seat 10 with a vertical pivoting function. The first flange 41 may comprise a first toothed crown and the second flange 42 may comprise guides capable of receiving and guiding locking grains. The locking grains may each have a toothing which is engaged with the first toothed crown in a rest state of the articulation mechanism 40 and which is spaced from the first toothed crown in an activated unlocked state of the articulation mechanism 40. The articulation mechanism 40 may be of the continuous hypocycloidal type with an eccentric cam. The pivot assembly 18 may comprise an electric motor 70 connected to the eccentric cam and configured to selectively rotate the eccentric cam. Such a hypocycloid articulation mechanism 40 proves to be inexpensive, since they are produced in large quantities for the backrest articulations 14 with motorized adjustment. The motor 70, partially visible in [Fig. 5], can be positioned below the lower plate 30 and the articulation mechanism 40. The motor 70 can be secured to the lower plate 30. As a result, a moderate seat thickness 12 can be obtained, the motor 70 being located in a technical zone under the articulation mechanism 40. An output shaft 43 of the motor 70 can be centered on the first axis A1. According to a particular arrangement, the first flange 41 may comprise a first toothed crown which comprises first teeth and the second flange 42 may comprise a second toothed crown which comprises second teeth. The first toothed crown and the second toothed crown may permanently mesh with each other over at least one angular sector under the effect of the eccentric control cam. The first and second toothed crowns may thus form a hypocycloidal interface, according to which the center of the second rotating crown is displaced relative to the center of the first toothed crown when the control cam rotates. According to a particular arrangement, an Oldham joint principle transmission may be provided to compensate for the eccentric effect generated by the eccentric cam hypocycloid articulation mechanism 40, the Oldham joint principle transmission being interposed between the articulation mechanism 40 and the upper plate 20. Advantageously, the articulation mechanism 40 may be non-reversible, namely a significant torque exerted between the first and second flanges 41, 42 cannot cause a relative movement of the first flange 41 with respect to the second flange 42, in the absence of rotation of the eccentric cam caused by the rotation of the motor 70. Thus, when the motor 70 is not controlled, even if a torque is exerted on the seat 10, no pivoting of the seat 10 occurs. The pivoting assembly 18 further comprises an electrical harness 50 which comprises at least one electrical cable. It is not excluded that the assembly comprises several electrical harnesses such as that described below. The electrical harness 50 may comprise a sheath in which the electrical cable is received. The electrical cable may be insulated. The electrical cable of the electrical harness 50 may be intended for an electrical connection between one of the control devices 16 and the corresponding functional device, or even with an on-board computer of the vehicle in which the seat is mounted. Also, the electrical cable of the electrical harness 50 may be intended for an electrical connection between at least one of the control or functional devices 16 with an electrical power supply member, such as an electric battery arranged for example under the seat 10 or in the vehicle in which the seat 10 is mounted. The electrical harness 50 extends through one of the first holes 32 of the lower plate 30 and through one of the second holes 22 of the upper plate 20, an intermediate portion 52 of the electrical cable then being received in housing 28. A first end portion 54 of the harness is located below the lower plate 30. The first end portion 54 emerges from the first hole, here downwards. A second end portion 56 of the electrical harness 50 is located above the upper plate 20. The second end portion 56 emerges from the second hole, here upwards. Remarkably, the intermediate portion 52 of the electrical harness forms at least one loop around the first axis A1. In this case, said at least one loop of the intermediate portion 52 of the electrical harness 50 is wound around the articulation mechanism 40. The lower plate 30 is configured to support said at least one loop. The winding of the intermediate portion 52 of the electrical harness 50 around the first axis A1 makes it possible to avoid shearing of the electrical harness 50 during the rotation of the upper plate 20 around the first axis A1 relative to the lower plate 30. Indeed, during the rotation of the upper plate 20 around the first axis A1 relative to the lower plate 30, the electrical harness 50 can be wound or unwound depending on the direction of rotation of the upper plate 20, thus avoiding a shearing effect on the latter, and in particular on each of the electrical cables that it comprises. Premature wear or damage to the electrical harness 50 is thus avoided. The fact that the intermediate portion 52 of the electrical harness 50 is received in the housing makes it possible to maintain the winding of the electrical harness 50 around the first axis A1. Also, remarkably, the housing receiving the intermediate portion 52 of the electrical harness 50 is obtained by directly connecting the upper plate 20 to the lower plate 30. In other words, the assembly of said at least one loop of the electrical harness 50 can be directly obtained by assembling only two elements, namely the upper plate 20 and the lower plate 30. Such a pivoting assembly 18 is therefore advantageously quick and easy to assemble. Depending on the winding configuration of the electrical harness around the first axis A1, it can form between 1 and 5 loops around the first axis A1, preferably between 1 and 3 loops around the first axis A1. Advantageously, the first hole 32 and the second hole 22 through whichextends the electrical harness are arranged at a distance from the first axis A1. The first end portion 54 and the second end portion 56 are thus at a distance from the first axis A1. This makes it possible to avoid twisting of the electrical harness 50 during rotation of the upper plate 20 around the first axis A1 relative to the lower plate 30. In other words, eccentrically placing the first end portion 54 and the second end portion 56 away from the first axis A1 makes it possible to ensure that the harness does not twist on itself, in particular from the first end portion and the second end portion. According to the example illustrated, each first hole 32 and each second hole 22 is at a distance from the first axis. Thus, it is possible to pass the electrical harness through any one of the first holes 32 and any one of the second holes 22.Also, the electrical harness 50 may be attached to a side edge of the first hole 32 and / or to a side edge of the second hole 22 through which it passes. It has been found that this facilitates the winding and unwinding of the harness around the first during a significant rotation of the upper plate 20 relative to the lower plate 30. The pivoting assembly 18 comprises 4 flanges 24 diametrically opposed two by two with respect to the first axis A1. Each flange 24 is securely connected to the upper plate 20. Each flange 24 comprises a first wall 24a having a generally cylindrical shape here with an arcuate section around the first axis A1. The arcuate section of the first wall of each flange 24 can extend angularly over a range of between 25° and 35°. The first wall 24a of each flange 24 is radially opposite a radially external face of the lower plate 30. The assembly of the first walls 24a of the flanges 24 forms a centering device for centering the upper plate 20 on the first axis A1 relative to the lower plate 30. The upper plate 20 can thus be assembled to the lower plate 30 in a manner centered on the first axis A1, without it being necessary to implement a centering operation.Such a self-centering pivot assembly 18 is faster to implement. Also, the first wall 24a of each flange 24 can act as a guide wall for the pivoting of the upper plate 20 relative to the lower plate 30. Each flange comprises a first rim 24b projecting from the first wall 24a radially inwardly relative to the first axis A1. A peripheral portion of the lower plate 30 is interposed in the direction of the first axis A1 between the first rim 24b of each flange 24 and the upper plate 20. A retention device is thus formed for retaining the upper plate 20 to the lower plate 30 in the direction of the first axis A1. A retention device makes it possible to prevent the upper plate 20 from lifting in the event of an accident, and therefore to maintain the cohesion of the seat 10 even in the event of a significant impact. The first rim 24b is projecting radially inward from the lower end of the first wall 24a. Each flange 24 finally comprises a second rim 24c extending from the first wall 24a radially outwards relative to the first axis A1. The second rim 24c of each flange 24 is fixed to the upper plate 20, in this case by a rivet 26. The second rim 24c projects radially outwards from the upper end of the first wall 24a. Reference is now made to Figures 6 to 8 to describe a second aspect of the pivot assembly 18 for the vehicle seat 10 with vertical pivot function. The second aspect of the pivot assembly 18 can be considered independently of the first aspect. Also, the elements relating to the electrical harness, the centering device and / or the retention device can be omitted in the pivot assembly 18 described below. The pivoting assembly 18 according to the second aspect comprises the lower plate 30 configured to be connected to a vehicle floor, the upper plate 20 pivotally mounted relative to the lower plate 30 around a first axis A1 and an annular guide device 60 comprising a plurality of rolling members 62 interposed between the lower plate 30 and the upper plate 20 and located at a distance from the first axis A1. Remarkably with respect to the second aspect of the pivoting assembly 18, the latter comprises an adjustment system adapted to adjust the distance dl in the direction of the first axis A1 between the lower plate 30 and the upper plate 20, radially at the level of the rolling members 62. The adjustment system makes it possible to avoid play between the rolling members and one and / or the other of the plates 20, 30 causing noise or to avoid crushing of the rolling members in the direction of the first axis A1 between the upper plate 20 and the lower plate 30. The adjustment system comprises a first tubular wall 81 around the first axis A1 secured directly or indirectly to the lower plate 30 and a second tubular wall 82 around the first axis A1 secured directly or indirectly to the upper plate 20. According to the examples shown in [Fig.6] and 7, the second tubular wall 82 is partly received by complementary shape in the first tubular wall 81. Also, in the examples shown in [Fig.6] and 7, the first tubular wall and the second tubular wall 82 are each cylindrical of revolution. The first tubular wall 81 and the second tubular wall 82 are able to slide relatively to each other in the direction of the first axis A1 before they are secured, thus allowing the adjustment of the distance dl in the direction of the first axis A1 between the lower plate 30 and the upper plate 20. For this purpose, the adjustment between the first tubular wall 81 and the second tubular wall 82 can be with a play, preferably small. The first tubular wall 81 and the second tubular wall 82 are able to slide relatively to each other in an intermediate configuration of the assembly of the pivoting assembly 18. In an assembled and final configuration of the pivoting assembly 18, the first tubular wall 81 is securely connected to the second tubular wall 82, preferably by welding. [Fig. 6] shows a first embodiment of the second aspect of the pivot assembly 18. In the first embodiment, a single-stage joint is provided as described with respect to the first aspect of the pivot assembly 18. In particular, as described above, the assembly according to the first embodiment of the second aspect comprises the articulation mechanism 40, continuous or discontinuous. The articulation mechanism 40 is interposed between the lower plate 30 and the upper plate 20 and by means of which the upper plate 20 is pivotally mounted relative to the lower plate 30 around the first axis A1, the articulation mechanism 40 being arranged at a central zone centered on the first axis A1. The articulation mechanism 40 comprises a first flange 41 and a second flange 42. The first flange 41 of the articulation mechanism 40 intended to be secured directly or indirectly to the lower plate 30 and the second flange 42 of the articulation mechanism 40 is intended to be secured directly or indirectly to the upper plate 20. In the first embodiment, as illustrated in [Fig.6] according to a first possibility, the adjustment system is interposed between the articulation mechanism 40 and the lower plate 30. More particularly, the adjustment system is interposed between the lower plate 30 and the first flange 41. The first tubular wall 81 is integral with the lower plate 30. The second tubular wall 82 is connected to the first flange 41. To this end, the adjustment system comprises an annular member 80 which comprises the second tubular wall 82. The annular member 80 is fixed to the first flange 41 of the articulation mechanism, preferably by welding. In this regard, the annular member 80 comprises an annular rim 86 extending radially inward from the second tubular wall 82. The rim 86 is connected, preferably by welding, to the first flange 41 of the articulation mechanism 40. The joining of the first tubular wall 81 and the second tubular wall 82 allows the joining of the lower plate 30 to the first flange 41 of the articulation mechanism 40. [Fig.7] shows a second embodiment of the second aspect of the pivot assembly 18. In the second embodiment, there is provided a double-stage articulation. In a double-stage articulation, there is provided a first articulation stage E1 and a second articulation stage E2 respectively comprising a first articulation mechanism 40a and a second articulation mechanism 40b, each being of the hypocycloidal continuous type as described above with reference to a single-stage articulation. The first articulation mechanism 40a and the second articulation mechanism 40b are arranged in series by being interposed between the lower plate 30 and the upper plate 20 and by means of which the upper plate 20 is pivotally mounted relative to the lower plate 30 around the first axis A1. The articulation mechanisms 40a, 40b are here also arranged at a central zone centered on the first axis A1. The articulation mechanisms 40a, 40b each comprise a first flange 41 and a second flange 42. The second flange 42a of the first articulation mechanism 40a is integral with the first flange 41b of the second articulation mechanism 40b. Also, the first flange 41a of the first articulation mechanism 40a is integral with the lower plate 30 and the second flange 42b of the second articulation mechanism 42 is integral with the upper plate 20. The second articulation mechanism 40b may be configured to compensate for the eccentric effect of the first articulation mechanism 40a. In other words, the eccentric effect of the second articulation mechanism 40b is 180° out of phase around the first A1 relative to the eccentric effect of the first articulation mechanism 40a. As a result, the seat 10 may rotate in a perfectly circular motion without any eccentric or hypocycloidal parasitic effect. The first articulation mechanism 40a may be coupled to a motor shaft 43 of a motor. In the second embodiment, the adjustment system is interposed between the first articulation mechanism 40a and the second articulation mechanism 40b. The first tubular wall 81 is connected to the second flange 42a of the first articulation mechanism 40a. The second tubular wall 82 is connected to the first flange 41b of the second articulation mechanism 40b. It is understood that in this case, the second flange 42a of the first articulation mechanism 40a is made integral with the first flange 41b of the second articulation mechanism 40b by means of the first tubular wall 81 and the second tubular wall 82 when these are secured to each other. Also, the first tubular wall 81 is integral with the lower plate 30 in the direction of the first axis A1 by means of the first articulation mechanism 40a and the second tubular wall 82 is integral with the upper plate 20 in the direction of the first axis A1 by means of the second articulation mechanism 82. As seen in [Fig.7], the adjustment system comprises a first organ annular 80a which comprises the first tubular wall 81. The first annular member 80a is fixed to the second flange 42a of the first articulation mechanism 40a, preferably by welding. To do this, the first annular member 80a comprises a first annular flange 86a extending radially inward from the first tubular wall 81. The first flange 86a is connected, preferably by welding, to the second flange 42a of the first articulation mechanism 40a. The adjustment system further comprises here a second annular member 80b which comprises the second tubular wall 82. The second annular member 80a is fixed to the first flange 41b of the second articulation mechanism 40b, preferably by welding. To do this, the second annular member 80b comprises a second annular rim 86b extending radially inward from the second tubular wall 82. The second rim 86b is connected, preferably by welding, to the first flange 41b of the second articulation mechanism 40b. Furthermore, the rolling members 62, further from the axis than the articulation mechanism 40, provide a significant lever arm to counteract tilting forces exerted on the seat 10, in particular the application of a horizontal force on the top of the backrest 14 of the seat 10. According to the example illustrated in [Fig. 8] compatible with the first and second embodiments, the rolling members 62 are here balls. The balls being a standard supply, a cheap solution is obtained for a large diameter annular guide, if necessary by using a ball guide cage. The balls can be held in an annular cage 64. The lower plate 30 and the upper plate 20 comprise an annular portion forming a rolling track on which the rolling members can roll.The distance dl in the direction of the first axis here separates the rolling track of the lower plate 30 from the rolling track of the upper plate 20. Other types of rolling members are possible. A method of assembling the pivot assembly 18 according to the second aspect as described above is now described. The method comprises a first step. The first step comprises providing a pivoting assembly 18 as described above, wherein the first tubular wall 81 and the second tubular wall 82 are at least partly received by form-fitting one into the other among the first tubular wall 81 and the second tubular wall 82, being able to slide relative to one another in the direction of the first axis A1. In other words, the first tubular wall and the second tubular wall are not integral with one another, thus making them able to slide relative to one another. This is the intermediate configuration of the pivoting assembly 18. The process includes a second step. The second step includes the de- placement of the lower plate 30 relative to the upper plate 20 in the direction of the first axis A1 by sliding the first tubular wall 81 and the second tubular wall 82 relative to each other (represented by the arrows F in figures 6 and 7) to obtain a distance d1 in the direction of the first axis A1 between the lower plate 30 and the upper plate 20 which allows adjustment of the rolling members 62 between the lower plate 30 and the upper plate 20. The adjustment of the rolling members 62 between the lower plate 30 and the upper plate 20 may be without tightening in the direction of the first axis and / or without play in the direction of the first axis. In other words, the rolling members 62 may be interposed between the lower plate 30 and the upper plate 20 may be without tightening in the direction of the first axis and / or without play in the direction of the first axis. Remarkably, the adjustment of the distance dl between the lower plate 30 and the upper plate 20 is quick and simple. The method comprises a third step. The third step comprises securing the first tubular wall 81 to the second tubular wall 82, preferably by welding. After the third step, the pivot assembly is in the assembled and final configuration. The invention is not limited to the examples described above and is susceptible to numerous variations. In particular, the first aspect of the pivot assembly 18 and the second aspect of the pivot assembly 18 may be combined in whole or in part. For example, the first tubular wall 81 and / or the second tubular wall 82 may delimit, radially inside relative to the first axis A1, the housing 28 of the pivoting assembly 18. Said at least one loop formed by the intermediate portion 52 of the electrical harness 50 may be wound around the first tubular wall 81 and / or the second tubular wall 82. The cage 64 can radially delimit the housing 28 on the outside.

Claims

Claims

1. A pivot assembly (18) for a vehicle seat (10) comprising: A lower tray (30) configured to be connected to a vehicle floor, the lower tray (30) comprising at less a first hole (32); an upper plate (20) pivotally mounted relative to the lower plate (30) around a first axis (A1), the plate upper (20) comprising at least one second hole (22), a housing (28) delimited in the direction of the first axis (A1) by the upper plate (20) and the lower plate (30); at least one electrical harness (50) which comprises at least one electric cable, the electric harness (50) extending to the through said at least one first hole (32) of the plate lower (30) and through said at least one second hole (22) of the upper plate (20), an intermediate portion (52) of the electric cable being received in said housing, said intermediate portion (52) forming at least one loop around of the first axis (A1), said lower plate (30) being configured to support said at least one loop.

2. Pivot assembly (18) according to the preceding claim, in which said at least one first hole (32) and said at least one second hole (22) are each arranged at a distance from the first axis (A1).

3. A pivot assembly (18) according to claim 1 or 2, wherein the electrical harness (50) is fixed to a side edge of the first hole (32) and / or to a side edge of the second hole (22).

4. A pivot assembly (18) according to any one of claims of the preceding claims, comprising at least one mechanism articulation (40) interposed between the lower plate (30) and the plate upper (20) and through which the upper plate (20) is pivotally mounted relative to the lower plate (30) around the first axis (A1), the articulation mechanism (40) being arranged between the plate lower (30) and the upper plate (20) following the direction of the first axis (Al) at a central area which is centered on the first axis (A1), said at least one loop of the intermediate portion (52) of the electrical harness (50) being wound around the mechanism of articulation (40).

5. Pivot assembly (18) according to the preceding claim, in which the hinge mechanism (40) is configured to lock the pi- voting of the upper plate (20) around the first axis (A1) by report to the lower plate (30).

6. A pivot assembly (18) according to any one of claims previous, the pivoting assembly (18) comprises a device of centering to center the upper plate (20) on the first axis (A1) relative to the lower plate (30).

7. Pivot assembly (18) according to the preceding claim, the pivoting assembly (18) comprising at least one flange (24) securely connected to the upper plate (20), said at least one flange (24) comprising a first wall (24a) having a shape generally cylindrical, preferably with an arc-shaped section, around of the first axis (A1), in which the centering device is formed by the first wall (24a) of said at least one flange (24).

8. A pivot assembly (18) according to any one of claims previous, the pivoting assembly (18) comprises a device of retention for retaining the upper plate (20) to the lower plate (30) along the direction of the first axis (A1).

9. Pivot assembly (18) according to the preceding claim, the re- claim 7 applying, wherein said at least one flange (24) comprises a first rim (24b) projecting from the first wall (24a) radially inward relative to the first axis (A1), a peripheral portion of the lower plate (30) being interposed according to the direction of the first axis (A1) between the first edge (24b) of said less one flange (24) and the upper plate (20) to form the retention device.

10. Vehicle seat (10) comprising a pivot assembly (18) according to any one of the preceding claims and a seat (12) seat (10) which comprises a seat frame (12), in which the seat frame (12) of the seat (10) is connected to the upper plate (20), directly or through a raising mechanism.