Equipment for adjusting the tilt of a seat back relative to a seat seat

Abstract

Equipment for adjusting the inclination of a backrest relative to a seat (1) comprising several continuous articulation mechanisms (4), each comprising: - a first flange (400) and a second flange (401) configured to be attached respectively to the seat and the backrest; - an input member (402), rotatably mounted, configured to be moved and cause the second flange (401) to move relative to the first flange (400), and wherein said input members (402) of the articulation mechanisms are driven by a control rod (5), coupled to the input members (402) of the articulation mechanisms, the control rod (5) being pivotally mounted about its axis, - a control and locking device (6), external to the articulation mechanisms (4), configured to ensure the irreversibility of the articulation mechanisms by blocking the rotation of the control rod (5) when the control and locking device (6) is not actuated.Figure from the summary: Figure 3.

Description

Title of the invention: Equipment for adjusting the inclination of a backrest relative to a seat

[0001] This disclosure relates to equipment for adjusting the inclination of a backrest relative to a seat comprising one or more continuous articulation mechanisms, as well as a locking control device, external to the articulation mechanism(s), configured to ensure the control of the articulation mechanism(s), as well as its irreversibility. technical field

[0002] The present disclosure relates to devices for adjusting the inclination of a vehicle seat back relative to the seat cushion, and for locking them, and more particularly to such devices comprising a continuous articulation mechanism. Prior art

[0003] Devices for adjusting the inclination of the backrest relative to a seat, based in particular on a continuous articulation mechanism, are known, for example from documents US 5,874,747 A, FR 2,902,375 Bl, US 8,985,887 B2, or DE102011051837.

[0004] A continuous articulation mechanism ensures continuous adjustment of the inclination of the backrest relative to the seat and typically comprises, as taught by the aforementioned documents, two flanges intended to be fixed respectively to the seat and the backrest, typically articulated to each other by a hypocycloidal gear train.

[0005] Such a hypocycloidal gear comprises a first external toothed ring, centered on a first axis and formed on one of the two flanges, meshing with a second internal toothed ring, centered on a second axis, coaxial with a drive shaft (hereinafter referred to as the drive rod), the second ring being formed on the other of the two flanges. The second axis is parallel to the first axis and offset from the first axis by an eccentric mechanism of the gear.

[0006] The eccentric mechanism cooperates with an input member, coupled to the control rod (constituted by a square section shaft, the input member mounted pivoting through the two flanges, internal to the articulation mechanism, the eccentric mechanism comprising for example a core-forming cam and wedge segments, reducing the cam play, and as for example disclosed by FR 2.902375 B1.

[0007] Document FR 2.902375 Bl addresses the problem of the reversibility of this type of continuous articulation mechanism in that it can be observed that repeated stresses applied to the backrest succeed in causing a modification of the The mechanism's behavior over time, and in particular an unwanted rotation of the eccentric mechanism, and thus a relative rotation between the two flanges of the joint, results in an unwanted change in the backrest's tilt. This is particularly noticeable when the backrest is heavily loaded, and / or when it has a significant tilt relative to the seat.

[0008] To solve this problem, document FR 2.902375 B1 describes a locking element, internal to the articulation mechanism, which prevents the rotation of the eccentric mechanism by wedging. In the event of stress on the backrest, the interaction of a ramp of the eccentric mechanism (caused to pivot unintentionally under stress on the backrest) and the ramp of the locking element generates a radial force pressing the locking element against one of the flanges to block it by friction, which in turn blocks the eccentric cam and thus the hypocycloidal gear.

[0009] When the user wishes to adjust the backrest angle relative to the seat, they operate a control handle (not shown) which causes the control rod and the input member, which is rotationally linked to the control rod, to rotate. The input member has control fingers, with one finger first pushing a wedge segment closer to the other wedge segment to allow slight play in the cam of the eccentric mechanism. Then, a finger presses against a shoulder of the cam to rotate it, which tends to separate the cam ramp and the locking element ramp, releasing the blockage. This then allows the simultaneous rotation of the cam and the locking element, driven by the input member.

[0010] Such a solution addresses the problem of the reversibility of the articulation mechanism by locking the eccentric mechanism against one of the flanges: it is a locking solution, internal to the articulation mechanism, which must therefore be integrated into each articulation mechanism when the seat has several articulation mechanisms, controlled by the same control rod connected to all the input elements of the different articulation mechanisms. Such an internal locking solution must be integrated into all continuous articulation mechanisms, which increases the cost of equipment with multiple articulation mechanisms.Without an internal locking mechanism in all the articulation mechanisms, stress on the backrest can cause the eccentric mechanism of the mechanism lacking a locking device to rotate unintentionally. This, in turn, will cause the input mechanism and, consequently, the control rod to rotate unintentionally. The unintentional rotation of the control rod will then unlock the internal locking systems of the other mechanisms. articulation mechanisms, even if they are equipped with a perfectly operational internal locking solution.

[0011] Another drawback of such a locking solution, internal to the articulation mechanism, is its reliability, particularly when several articulation mechanisms are linked by the same control rod. Equipment for adjusting the tilt of a backrest relative to a seat typically comprises at least two articulation mechanisms per seat, with a first articulation mechanism, right, and a second articulation mechanism, left, a first left input member of the first articulation mechanism and a second right input member of the articulation mechanism coupled in rotation by the same control rod extending transversely.Indeed, a malfunction of the internal locking solution of only one of the articulation mechanisms can cause an undesired change in the backrest tilt, typically a sagging of a heavily loaded or heavily tilted backrest, in that an undesired rotation of the control rod caused by the defective mechanism can trigger the release of the internal locking solutions of all the other articulation mechanisms linked to the same control rod, even if they are not defective. Summary

[0012] This disclosure improves the situation.

[0013] Equipment is proposed for adjusting the inclination of a backrest relative to a seat comprising one or more continuous articulation mechanisms, each articulation mechanism comprising: - a first flange and a second flange configured to be attached respectively to the seat and the backrest according to a first possibility, or conversely the first flange and the second flange attached respectively to the backrest and the seat according to a second possibility; - an input member, rotatably mounted, configured to be moved in a first direction of rotation, and in a second direction of rotation, and to cause the second flange to move relative to the first flange, and wherein said input member of the articulation mechanism, or said input members of the articulation mechanisms, are driven by a control rod, rotationally coupled with the input member of the articulation mechanism, or the input members of the articulation mechanisms, the control rod pivotally mounted about a longitudinal axis of the rod.

[0014] According to this disclosure, said equipment includes a control and locking device, external to the articulation mechanism, or external to the articulation mechanisms, configured to control the articulation mechanism(s) when changing the inclination of the backrest relative to the seat, and the irreversibility of the articulation mechanism(s) by blocking the rotation of the control rod when the control and locking device is not actuated.

[0015] According to this disclosure, the irreversibility of the articulation mechanism, or of all the articulation mechanisms when said equipment comprises several articulation mechanisms controlled by the control rod, is advantageously ensured by locking the control rod

[0016] Consequently, the external control and locking device advantageously ensures the irreversibilities of the various articulation mechanisms controlled by the control rod, and in particular even if these articulation mechanisms are not provided with internal locking solutions.

[0017] According to this disclosure, the control and locking device comprises: - a first follower, fixed in rotation to the control rod, and a second driving element, mounted to pivot according to an angular stroke limited relative to the first element around the control rod, and wherein said first organ and second organ comprise first stop means configured to ensure the rotational drive of the first follower organ by the second driving organ, in the first direction of rotation, at a first rotational limit of the second control organ relative to the first organ, and second stop means configured to ensure the rotational drive of the first follower organ by the second driving organ, in the second direction of rotation, at a second limit of the second control organ relative to the first control organ - elastic means constraining the second organ to rotate relative to the first organ in a rest position, intermediate between the first and second end points of travel - a locking element fixed in rotation to the first component, around the axis of the control rod, movable relative to the first component in a radial direction to the axis of the control rod by means of guidance between said locking element and the first component, said locking element being configured to lock onto a fixed support, fixed relative to the first flange according to the first possibility or said fixed support, fixed relative to the second flange according to the second possibility, in a locking position of the locking element, under the action of a restoring force of spring means in order to ensure the immobilization in rotation of the control rod in the rest position of the second component relative to the first component, - cam means carried by the second component, configured to move said blocking element radially against the restoring force of the spring means, from the blocking position up to at least one retracted position for which said blocking element is moved away from the fixed support, at least partially, releasing the rotation of the control rod at least in the direction of rotation imposed by the second driving element, said blocking element being retracted radially, by a first cam when the second element and the first element are in the first end-of-stroke position, when driven in the first direction of rotation, and by a second cam when the second element and the first element are in the second end-of-stroke position, when driven in the second direction of rotation.

[0018] According to one embodiment, the second element can be a rotary button, manually operated by an operator, around the axis of the control rod.

[0019] According to one embodiment, the fixed support includes an opening, centered around the longitudinal axis of the control rod, said opening having on an internal diameter a plurality of teeth against which the locking member comes to lock according to different discontinuous angular locking positions defined by the teeth, around the axis of the control rod, in said locking position.

[0020] The blocking of the blocking element against the teeth ensures a firm locking of the blocking element in discontinuous locking positions, and as opposed to a blocking which would be ensured only by friction between two smooth surfaces of the blocking element and the fixed support.

[0021] In particular, said locking element may include two locking projections, distributed on either side of the radial direction imposed by the guiding means, both located on a first side with respect to a plane, perpendicular to the radial direction passing through the axis of the control rod, the radial projections configured to lock against the teeth of the opening, in discontinuous locking angular positions, in the locking position of the locking element.

[0022] If the user ever changes the tilt of the backrest by rotating the control rod, up to a position of the articulation mechanism for which said locking element is oriented between two discontinuous locking angular positions, a minute reversibility may occur, typically imperceptible to the user, until the locking element is moved and the spring means constrain the locking element again in the locking position, in one of the discontinuous locking angular positions, according to an angular stroke less than the gap between two consecutive teeth of the support.

[0023] According to one embodiment, the fixed support may comprise a first thin element extending along a first planar element, at the level of the opening, said blocking element being a second thin element extending along a second planar element, received in the opening, the first planar element and the second planar element, substantially coplanar, perpendicular to the axis of the control rod, the first planar element and the second planar element interposed between the first organ and the second organ of the control and locking device.

[0024] The implementation of the locking element and the fixed support, in the form of thin elements interposed between the first and second elements, allows the flanges (hereinafter referred to as the third and fourth flanges) of the first and second elements to be brought as close as possible to the flanges (hereinafter referred to as the third and fourth flanges) of the first and second elements, along the direction of the control rod. The flanges of the first and second elements are separated by a distance corresponding approximately to the thickness of the thin elements, within the operating clearance. Such an arrangement advantageously ensures a highly compact design of the external control and locking device, along the direction of the control rod.

[0025] According to one embodiment, said locking element comprises said two radial projections configured to lock against two teeth of the opening; the two projections located on a first side with respect to a third plane passing through the axis of the control rod and perpendicular to the radial direction and in which said locking element has on the second side with respect to the third plane, an elastic portion compressed elastically against an edge of the opening of the fixed support constituting said elastic means and said spring means.

[0026] The elastic means constraining in rotation (around the axis of the control rod) the second element relative to the first element in its rest position, on the one hand, and the spring means constraining the locking element along the radial direction imposed by the guiding means from its retracted position to its locking position, on the other hand, can advantageously be made from the same elastic portion of the locking element.

[0027] According to one embodiment, the cam means may include: - the first cam configured to come to a stop with a first shoulder of the locking element on one side of the plane passing through the radial direction and the axis of the control rod when the second member and the first member are in the first end-of-stroke position, - the second cam configured to come to a stop with a second shoulder of the blocking element on the other side of the plane passing through the radial direction and the axis of the control rod when the second component and the first component are in the second end-of-stroke position.

[0028] According to one embodiment, the first cam and the second cam are formed respectively in projection towards the first member, according to the direction of the control rod.

[0029] According to one embodiment, the first stop means and the second stop means may comprise: - a first opening in the body of the first organ, receiving the first protruding cam, - a second opening in a body of the second element, receiving the second protruding cam. The first cam / first opening pair and / or the second cam / second opening pair are configured to limit the angular displacement of the second element relative to the first element by defining the first and second end points.

[0030] According to one embodiment, the guiding means may comprise two protruding lugs on one face of the first member projecting towards the second member, and two notches in the locking element cooperating respectively with the two lugs. The lugs define the radial direction of movement of the locking element relative to the first member. According to one embodiment, the distal ends of the lugs are received in two blind holes in the second member.

[0031] According to one embodiment, the equipment may include centering means between the first member and the fixed support, centered around the axis of the control rod, for example in the form of guides of the fixed support 603, distributed around the axis of the control rod and cooperating in the guidance with a circular peripheral edge of the first member.

[0032] According to one embodiment, the articulation mechanism may be a continuous articulation mechanism comprising a hypocycloidal gear connecting the first flange to the second flange, said hypocycloidal gear comprising: - a first external toothed crown, centered on a first axis and formed on the first flange; - a second internal toothed ring, centered on a second axis, coaxial with the control rod, the second axis parallel to the first axis and offset from the first axis by an eccentric cam, said second toothed ring being formed on the second flange and having an inner diameter greater than the outer diameter of the first toothed ring, - said eccentric cam mounted to rotate about the second axis cooperating with the input member which is mounted to rotate about the second axis, the input member configured to drive the eccentric cam in rotation about the second axis, in the first direction or in the second direction, thus ensuring the movement of the second flange relative to the first flange according to a hypocycloidal movement imposed by the gearing.

[0033] In particular, and according to one embodiment: - the first flange comprises a first cylindrical housing centered on the first axis, - the second flange comprises a second annular housing centered on the second axis, delimited on one side by the second toothed ring and, on the other side, by a collar, and in which the second housing receives the first crown of the first flange, and in which said eccentric cam comprises an external diameter, configured to slide on an internal sliding wall of the first cylindrical housing of the first flange, and an internal diameter configured to slide on an external sliding wall of the collar.

[0034] According to one embodiment, said eccentric cam may have backlash compensation comprising: - a core, comprising an inner wall configured to pivot on an outer sliding wall of the collar, and an outer wall - two sliding elements, with a wedge function, arranged between, on the one hand, the internal sliding wall of the first housing and the core, configured to slide internally on the external wall of the core and externally on the internal sliding wall of the first housing, - a spring positioned between the two sliding elements and forcing the sliding elements to a mutual separation, and in which a first of the sliding elements is configured to block a rotation of the eccentric cam relative to the first flange, in the first direction of rotation, by wedge effect between the sliding element, on the one hand, between the outer wall of the core and the inner sliding wall of the first flange, and wherein a second sliding element is configured to block rotation of the eccentric cam relative to the first flange, in the second direction of rotation, by wedge effect between the sliding element, on the one hand, between the outer sliding wall of the core and the inner sliding wall of the first flange, and wherein the input member is configured to abut against the first sliding element, bringing it closer to the second sliding element, thereby releasing the rotation and causing the eccentric cam to rotate in the first direction of rotation, when the input member is driven by the control rod in the first direction of rotation, and in which the input member is configured to come against the second sliding element by bringing it closer to the first sliding element, releasing the rotation and causing the rotation of the eccentric cam in the second direction of rotation, when the input member is driven by the control rod in the second direction of rotation.

[0035] The primary function of the backlash-compensating eccentric cam is to eliminate cam backlash when the two sliding elements are separated by the spring, thereby reducing vibration and noise in the continuous articulation mechanism. When the two wedge-shaped sliding elements are separated by the spring, this prevents the eccentric cam from rotating.

[0036] However, such a locking mechanism is not sufficient in itself to address the identified problem of unwanted changes in the backrest's inclination, particularly when the backrest is heavily loaded and / or when the backrest is significantly inclined relative to the seat after repeated stress on the backrest. The control and locking device according to this disclosure, which includes said radially moving locking element, addresses this problem by locking the control rod.

[0037] The present disclosure also relates to a motor vehicle seat comprising a seat and a backrest, as well as equipment according to the present disclosure, comprising one or more articulation mechanisms, the first flange attached to the seat and the second flange attached to the backrest according to the first possibility, or conversely the first flange attached to the backrest, and the second flange attached to the seat according to the second possibility. Brief description of the drawings

[0038] Other features, details and advantages will become apparent from the detailed description below and from the analysis of the accompanying drawings, in which: Fig. 1

[0039] [Fig. 1] is a schematic view of a motor vehicle seat comprising equipment according to this disclosure, the first flange and second flange of two articulation mechanisms being attached respectively to the seat back and seat cushion, on both sides of the seat, controlled by a single control rod, to ensure adjustment of the backrest's inclination relative to the seat, a control and locking device allowing adjustment of the inclination when manually operated by the operator, as well as angular locking of the articulation mechanisms by locking the control rod Fig. 2

[0040] [Fig.2] is a cross-sectional view, along a plane passing through the control rod, of equipment according to the present disclosure, comprising, on the one hand, on the left, the articulation mechanism with the first flange and the second flange, as well as the eccentric cam controlled by the input member fixed in rotation to the control rod, and on the right, the control and locking device comprising the first member which is fixed in rotation to the control rod, and the second rotating movable part, according to a limited stroke around the axis of the control rod relative to the first part, the control and locking device comprising a blocking element, interposed between the first part and the second part, rotationally fixed to the first movable part, movable in a radial direction, from a blocking position for which said blocking element locks onto a fixed support to ensure the blocking of the control rod, and thus ensure the irreversibility of the articulation mechanism(s), when the second driving part is in an intermediate rest position relative to the first part between two end-of-stroke positions, and up to a retracted position of the blocking element when the second driving part is in one of the two end-of-stroke positions relative to the first part,releasing and causing the control rod to rotate when the second component is manually operated. Fig. 3

[0041] [Fig.3] is a perspective view of the control and locking device (the articulation mechanism not shown). Fig. 4

[0042] [Fig.4] is an exploded view of [Fig.3], illustrating from left to right, the first organ, the fixed support, said blocking element, and the second organ. Fig. 5

[0043] [Fig.5] is a rear view of the control and locking device, illustrating the first member, with a first opening and a second opening, receiving respectively a first stud and a second stud integral with the second member, the first opening / first stud couple and the second opening / second stud couple, limiting the angular stroke of the second member relative to the first member by forming the first and second stop means. Fig. 6

[0044] [Fig. 6] is a cross-sectional view of the control and locking device, along a plane perpendicular to the axis of the control rod, illustrating said locking element in the locked position in which a first projection and a second projection are engaged with teeth of an opening in the fixed support Fig. 7

[0045] [Fig. 7] is a view, on the one hand, on the left, of an internal face of the first member, illustrating two lugs of the guide means, the two lugs configured to slide in two notches of the locking element in the radial direction, as well as the first and second openings, and on the other hand, on the right, of a face internal of the second organ, including the first and second spots, as well as the first and second blind holes. Fig. 8

[0046] [Fig-8] is a cross-sectional view of the control and locking device, on the left, in the locked position of the locking element ensuring the rotational locking of the control rod, and thus the irreversibility of the articulation mechanism(s) controlled by the control rod, and on the right, in the retracted position of the locking member, allowing the rotational drive of the control rod Fig. 9

[0047] [Fig. 9] is a view of an example of the articulation mechanism comprising the first flange carrying the first toothed ring, the second flange carrying the second toothed ring, and the eccentric cam cooperating with the input member fixed in rotation to the control rod Fig. 10

[0048] [Fig. 10] shows a detail view of the eccentric cam which comprises the core, the first sliding element and the second sliding element with wedge function, and the spring mutually separating the two sliding elements. Description of the implementation methods

[0049] The drawings and description below contain, essentially, elements of a definite nature. They may therefore not only serve to better understand this disclosure, but also contribute to its definition, if necessary.

[0050] Also, the present disclosure relates to equipment configured to change the inclination of a backrest 3 relative to a seat 2 of a seat 1, in particular of a motor vehicle.

[0051] Such equipment comprises one or more continuous articulation mechanisms 4, the articulation mechanism(s) 4 comprising: - a first flange 400 and a second flange 401 configured to be typically attached respectively to the seat 2 and the backrest 3 according to a first possibility, or conversely, namely that the first flange is attached to the seat and the second flange to the backrest according to a second possibility; - an input member 402, rotatably mounted, configured to be moved in a first direction of rotation and in a second direction of rotation, and to cause the second flange 401 to move relative to the first flange 400 in order to change the inclination of the backrest relative to the seat, and wherein said input member 402 of the articulation mechanism, or said input members 402 of the articulation mechanisms, are driven by a control rod 5, rotationally coupled with said input element, or coupled simultaneously with input elements 402, the control rod 5 mounted pivotally around a longitudinal axis of the rod.

[0052] The articulation mechanism 4 may be a continuous articulation mechanism comprising a typically hypocycloidal gear connecting the first flange 600 to the second flange 601, said hypocycloidal gear comprising: - a first toothed crown CRI, external, centered on a first axis Y1 and formed on the first flange 400; - a second internal toothed crown CR2, centered on a second axis Y2; coaxial to the control rod 5, said second toothed ring CR2 being formed on the second flange 401 and having an inner diameter greater than the outer diameter of the first toothed ring CRI; the second axis Y2 is parallel to the first axis and offset from the first axis Y1 by an eccentric cam Ex - said eccentric cam Ex mounted rotatably around the second axis Y2 cooperating with the input member 402 mounted pivotally around the second axis Y2 configured to drive the eccentric cam in rotation around the second axis Y2, in the first direction or in the second direction, thus ensuring the displacement of the second flange 401 relative to the first flange 400 according to a hypocycloidal movement imposed by the gear.

[0053] Thus the rotation of the eccentric cam makes it possible to change the point of contact between the first toothed ring CRI and the second toothed ring CR2 engaged by their teeth and thus cause the second flange to move relative to the first flange along the trajectory imposed by the hypocycloidal gear.

[0054] In particular, and according to one embodiment: - the first flange 401 may include a first cylindrical housing centered on the first axis Y1 - the second flange 402 may include a second, annular housing, centered on the second axis Y2, delimited on the one hand, externally, by the second toothed ring CR2, internal, and, on the other hand, internally by a collar CLT2. The second housing receives the first ring CRI of the first flange 400.

[0055] The eccentric cam Ex includes an external diameter, configured to slide on an internal sliding wall Pint of the first cylindrical housing of the first flange, preferably by means of an external bearing ring BP, embedded or even welded, and an internal diameter configured to slide on an external sliding wall Pext of the collar CLT2, in particular by means of an internal bearing.

[0056] In particular, said eccentric cam may be backlash-adjustable and, for example, include: - a core Noy, comprising an internal cylindrical wall configured to pivot on the external sliding wall of the collar CL2, cylindrical, and an external wall - two sliding elements COI, CO2, with a wedge function, arranged between, on the one hand, the internal sliding wall of the first housing, and, on the other hand, the core, configured to slide internally on the external wall of the core Noy and externally on the internal sliding wall of the first housing, - a Rext spring arranged between the two sliding elements COI, CO2 and forcing the sliding elements to the mutual separation.

[0057] A first of the sliding elements COI, CO2 is configured to block a rotation of the eccentric cam relative to the first flange 400, in the first direction of rotation, by wedge effect between the sliding element, on the one hand, between the outer wall of the core Noy and the inner sliding wall Pint of the first flange 400.

[0058] A second of the sliding elements COI, CO2 is configured to block a rotation of the eccentric cam Ex relative to the first flange 400, in the second direction of rotation, by wedge effect between the sliding element on the one hand between the external sliding wall of the core Noy and the internal sliding wall Pint of the first flange.

[0059] The input member 402 is configured to come against the first sliding element COI, in particular by bringing it closer to the second sliding element CO2, releasing the rotation and causing the rotation of the eccentric cam Ex in the first direction of rotation, when the input member is driven by the control rod 5, following the first direction of rotation.

[0060] The input member 402 is configured to come against the second sliding element CO2 by bringing it closer to the first sliding element COI, releasing the rotation and causing the rotation of the eccentric cam Ex in the second direction of rotation, when the input member is driven by the control rod 5 in the second direction of rotation.

[0061] The primary function of the backlash-compensating eccentric cam is to eliminate backlash in the eccentric cam when the two sliding elements CO1 and CO2 are separated by the spring, thereby suppressing vibrations and noise in the articulation mechanism when the second component is at rest relative to the first component of the control device. When the two wedge-shaped sliding elements are separated by the spring, this prevents the eccentric cam from rotating.

[0062] However, such a locking mechanism is not sufficient in itself to address the identified problem of unwanted changes in the backrest's inclination, particularly when the backrest is heavily loaded, and / or when the backrest is significantly inclined relative to the seat after repeated stress on the backrest. In such a case, unwanted slippage may occur between the eccentric cam and the wall. internal sliding of the first flange, even when the sliding elements are moved apart and eliminate the play.

[0063] Generally the input member 402, typically in the form of a plastic element, for example molded, may generally comprise two stops, configured respectively to come into contact, respectively with the first sliding element CO1 when driven by the control rod 5 in the first direction of rotation, and with the second sliding element CO2 when driven by the control rod in the second direction of rotation, and as seen by way of example in [Fig. 10].

[0064] Generally, the input member can be in the form of a disc, centered on the second axis Y2 with two projections, angularly offset from each other around the second axis Y2, forming the two stops respectively, as well as a cylindrical centering pot mounted on a swivel inside the collar CTL2 of the second flange. The centering pot includes a tubular recess, with a non-circular cross-section, such as, for example, a square cross-section, receiving the control rod 5. The non-circular cross-section of the tubular recess is complementary to the cross-section of the control rod 5, in order to prevent relative rotation between the input member and the control rod 5, around the axis of the control rod.

[0065] Notably, and according to this disclosure, said equipment includes a control and locking device 6, external to the articulation mechanism(s), configured to ensure control of the articulation mechanism(s) 4 when there is a change in the inclination of the backrest relative to the seat, as well as the irreversibility of the articulation mechanism, or articulation mechanisms, by blocking the rotation of the control rod 5 when the control and locking device is not actuated.

[0066] When the equipment includes several articulation mechanisms operated by the control rod 5, the control and locking device 6 advantageously ensures the irreversibility of all the articulation mechanisms 4 operated by the control rod 5.

[0067] The control and locking device 6 comprises a first follower 600, rotationally fixed to the control rod 5, and a second driver 601, pivotally mounted with an angular stroke limited relative to the second driver, around the axis of the control rod 5.

[0068] The second component 601 can be a rotary knob or handle, manually operated by an operator.

[0069] The first organ 600 and the second organ 601 may be in the form of flanges, namely that the first organ 600 may be a third flange, and the second organ 601 may be a fourth flange, substantially parallel to the third flange. These third and fourth flanges extend parallel to the first flange 400 and the second flange 401 of the articulation mechanism(s) 4. The planes of the flanges (first, second, and even third and fourth) are substantially perpendicular to the control rod 5.

[0070] The rotational locking of the first member 600 and the control rod 5 can be obtained by means of a tubular recess 6000 (visible in [Fig.7]), of non-circular section, for example of square section, of complementary shape to the section of the control rod 4, which can generally be of non-circular section, for example of square section, as illustrated for example in [Fig.9].

[0071] The rotational guidance of the second element 601 relative to the first element 600 can be achieved by means of a cylindrical centering pin 6001, centered on the second axis Y2, projecting from the third flange formed by the first element, around which the second element 600 pivots, via a cylindrical recess 6010. The centering pin 6002 is tubular, comprising the non-circular recess 6000 receiving the control rod 5

[0072] Said first organ 600 and second organ 601 comprise: - of the first stop means B1 configured to ensure the rotational drive of the first element 600, follower (rotating around the axis of the control rod), by the second element 601, driver, according to the first direction of rotation, at a first end of rotational stroke of the second control element 601 relative to the first element 600, - second stop means B2 configured to ensure the rotational drive of the first element 600, follower (rotating around the axis of the control rod), by the second element 601, driver, according to the second direction of rotation, in a second end of travel of the second control element relative to the first control element.

[0073] The control and locking device 6 may include elastic means ME constraining, in rotation around the control rod 5, the second member 601 relative to the first member 600 in a rest position PR, intermediate between the first end of stroke and the second end of stroke.

[0074] Notably, the control and locking device 6 includes a locking element 602 fixed in rotation to the first member 600, around the axis of the control rod 5, movable relative to the first member 601 in a radial direction DR to the axis of the control rod by means of guide Gl, G2 between said locking element 602 and the first member 600.

[0075] Said locking element 602 is advantageously configured to lock onto a fixed support 603, in a locking position PB of the locking element 602, under the action of a restoring force from spring means MR in order to ensure the immobilization in rotation of the control rod 5 in the rest position PR of the second component 601 relative to the first component 600.

[0076] The fixed support 603 is fixed relative to the first flange 400, according to the first possibility, namely when the first flange 400 is attached to the seat, the second flange 401 then being attached to the backrest 3. In the case of the second possibility not illustrated, namely the first flange is attached to the backrest and the second flange is attached to the seat, the fixed support is attached to the second flange.

[0077] The fixed support 603 is typically fixed by means of an angled part, illustrated in particular in [Fig.3], identified as 6030 in [Fig.4]. This angled part can typically be fixed to a fixed gusset of the seat, this fixed gusset being fixed to the first flange (typically by welding) according to the first possibility, or fixed to the second flange (for example by welding) according to the second possibility, and while the movable gusset attached to the backrest is typically fixed by welding to the second flange according to the first possibility, or (for example by welding) to the first flange according to the second possibility.

[0078] Such a locking position PB of the locking element 602 is illustrated in [Fig. 6], or on the left in [Fig. 8]. Preferably, the fixed support 603 may include an opening Ov, centered around the longitudinal axis of the control rod 5. Said opening OV may be provided on an internal diameter with a plurality of teeth d, in particular at an edge of the opening Ov, against which the locking member 602 locks according to different discontinuous angular locking positions defined by the teeth, around the axis of the control rod 5, in said locking position PB.

[0079] If ever the user changes the tilt of the backrest by rotating the control rod 5, to a position of the articulation mechanism for which said locking element is oriented between two discontinuous locking angular positions, a minute reversibility may occur, typically imperceptible to the user, along an angular stroke less than the gap between two consecutive teeth of the fixed support 603, until the spring means MR constrain the locking element 602 again in the locking position PB, in a discontinuous locking angular position.

[0080] The first stop means Bl, according to an embodiment illustrated in particular in the figures, may comprise mutually engaging parts distributed on the second member 601 and the first member 600, which are configured to engage directly against each other at the first end of travel. Direct engagement means that the torque transmitted from the second member 601 to the first member 600 is transmitted directly from the second member 601 to the first member 600 without passing through the locking element 602. Alternatively, and according to a mode of realization not illustrated, the mutually engaging parts cooperate indirectly in the first end of the stroke, namely that the torque is transmitted via the blocking element 602.

[0081] The second stop means B2 may, according to an embodiment illustrated in particular in the figures, comprise mutually engaging parts distributed on the second member 601 and the first member 600, which are configured to engage directly with each other at the second limit switch. Direct engagement means that the torque transmitted from the second member 601 to the first member 600 is transmitted directly from the second member 601 to the first member 600 without passing through the locking element 602. Alternatively, and according to an embodiment not illustrated, the mutually engaging parts cooperate indirectly at the second limit switch, namely that the torque is transmitted via the locking element 602.

[0082] The equipment may include centering means between the first member 600 and the fixed support 603, centered around the axis of the control rod 5, for example in the form of guide(s) 6031 of the fixed support 603, distributed around the axis of the control rod 5 and cooperating in the guidance with a circular peripheral edge of the first member 600.

[0083] For example, in figures 3 and 4 it can be seen that the fixed support includes three guides 6031, distributed at 120° around the axis of the control rod 5. These discontinuous guides 6031 can be three or more in number, or replaced by a continuous guide on the periphery of the fixed support 3. The continuous guide or discontinuous guides extend in projection from the plane of the opening Ov, substantially along the direction of the control rod 5. The function of the continuous guide (or discontinuous guides) is to ensure centering of the fixed support 603 relative to the first member 600 along the axis of the control rod 5. Such guidance prevents any relative displacement of the fixed support 603 relative to the first member 600 along a radial direction of the control rod 5, in particular in the locking position PB of the locking element 602, as such relative displacement is likely to promote unintentional unlocking of the locking element 602.

[0084] The control and locking device 6 may include cam means Cl, C2 carried by the second member 601, comprising a first cam Cl and a second cam C2, configured to move said locking element 602, radially against the restoring force of the spring means MR, from the locking position PB to at least one retracted position PE for which said locking element 602 is moved away from the fixed support 603, at least partially, releasing the rotation of the control rod 5 at least in the direction of rotation imposed by the second member 601, driver.

[0085] Said blocking element 602 can be retracted radially: - by the first cam Cl when the second component 601 and the first component 600 are in the first end-of-stroke position, when driven in the first direction of rotation, and, - by the second cam C2 when the second component 601 and the first component 600 are in the second end-of-stroke position, when driven, according to the second direction of rotation.

[0086] Said locking element 602 may include, in the locking position PB, two locking projections SI, S2, distributed on either side of the radial direction DR imposed by the guiding means Gl, G2. The two radial projections SI S2 are, both located on a first side with respect to a plane, perpendicular to the radial direction DR passing through the axis of the control rod 5, the radial projections SI, S2 configured to lock against the teeth d of the opening Ov in the discontinuous locking angular positions, when the locking element is in the locking position PB.

[0087] Said blocking element 602, may have on the second side with respect to the third plane, an elastic portion 6020 compressed elastically against an edge of the opening of the fixed support 603 constituting simultaneously the elastic means ME and / or the spring means MR.

[0088] The fixed support 603 can be a first thin element extending along a first planar element, at the level of the opening Ov, perpendicular to the axis of the control rod 5. The first planar element and the second planar element can be interposed between the first member 600 and the second member 601 of the control and locking device 6.

[0089] Said blocking element 602 may be a second thin element extending along a second planar element, received in the opening. The first planar element and the second planar element may be substantially coplanar, perpendicular to the axis of the control rod.

[0090] The implementation of the locking element and the fixed support, in the form of thin elements interposed between the first and second components, allows the flanges (namely the third and fourth flanges) of the first and second components to be brought as close as possible along the direction of the control rod. The flanges of the first and second components are separated by a distance corresponding approximately to the thickness of the thin elements, within the operating clearance. Such an arrangement advantageously ensures a high degree of compactness of the external control and locking device, along the direction of the control rod.

[0091] The thickness of the element can be between 0.4 mm and 1.2 mm, such as, for example, between 0.5 mm and 0.8 mm. The fixed support is at least equal in thickness. to the thickness of the locking element, or even to a thickness greater than the thickness of the locking element, for example, 0.2 mm to 0.6 mm greater. The respective internal walls of the third and fourth flanges can be separated by a distance corresponding to the thickness of the fixed support 603, within the operating clearance. The fixed support 603, in particular the part having said opening Ov, is thus locked along the axial direction to the control rod, held between the first member 600 and the second member 601.

[0092] The overall dimensions of the control and locking device 6 along the axis of the control rod 5 (comprising the first member 600, the second member 601, the fixed support 603 and said locking element 602) can be reduced, namely that the distance 1 (see [Fig.2]) can be less than 24 mm, in particular less than 20 mm, such as less than 16 mm.

[0093] The blocking element 602 and the part of the fixed support 603 carrying the opening Ov, are substantially coplanar and are interposed between the third flange of the first member 600; and the fourth flange of the second member 601, along the direction of the control rod 5.

[0094] In general, it is noted that the blocking element 602 includes a central opening 6021, through which, on the one hand, the control rod 5 passes and, on the other hand, the centering pin 6002 of the first member 600 passes.

[0095] As can be understood, during the assembly of the control and locking device 6, the centering pin 6002 is inserted into the opening OV of the fixed support, and into the central opening 6021 of the locking element 602.

[0096] The centering pin 6002 of the first member 600 is then inserted into the cylindrical recess 6010 of the second member so that the centering pin 6002 protrudes externally from the fourth flange formed. The locking element and the coplanar part of the fixed support are blocked along the axial direction of the control rod 5, on one side by the inner wall of the third flange of the first member 600, and on the other side by the inner wall of the fourth flange of the second member 600.

[0097] A retention means attached to the protruding end of the centering stud 6002 holds the second component 601 onto the centering stud 6002, preventing it from moving away from the first component 600. This retention means may consist of elastic teeth 6001, provided on the periphery at the distal end of the centering stud, as seen in [Fig. 4], which hook onto the outer wall of the fourth flange during insertion. These elastic teeth 6001 deform radially inward when inserted into the cylindrical recess 6010, before elastically returning to retain the outer wall of the third flange. The retention means can still be constituted by a retaining ring 6003 such as a circlip, coming against the outer wall of the fourth flange, as seen in [Fig.3].

[0098] The means of cam Cl, C2 may include: - the first cam Cl configured to come to a stop with a first shoulder Epi of the blocking element 602 on one side of the plane passing through the radial direction DR and the axis of the control rod 5 when the second element 601 and the first element 600 are in the first end-of-stroke position, - the second cam C2 configured to come into contact with a second shoulder Ep2 of the blocking element 602 on the other side of the plane passing through the radial direction DR and the axis of the control rod 5 when the second member 601 and the first member 600 are in the second end-of-stroke position.

[0099] It is noted that the first cam Cl and the second cam C2 can be formed projecting from one face of the second member 601, projecting towards the first member 600, and for example constituting a first stud and a second stud.

[0100] According to one embodiment, the first stop means B1 and the second stop means B2 may include a first opening OV1 in a body of the first member 600, receiving the first cam Cl in projection, and a second opening OV2 in a body of the second member 601, receiving the second cam in projection C2.

[0101] The first cam Cl / first opening OV1 pair and / or the second cam C2 / second opening OV2 pair can be advantageously configured to limit the angular displacement of the second element relative to the first element by defining the first and second end points. Thus, in [Fig. 5] in particular, it can be seen that the first opening OV1 (respectively the second opening OV2) has a larger dimension than the cross-section of the first cam Cl (respectively the second cam C2) so as to allow limited angular travel between the first and second elements.

[0102] In general, the limited angular stroke can be between 5°° and 60°, or preferably between 5° and 30°°.

[0103] The guiding means may include two protruding lugs Gl, G2 projecting from one face of the first member 600 towards the second member 601 and two notches in the locking element 602 cooperating respectively with the two lugs Gl, G2. The two lugs are aligned radially to the axis of the control rod along the radial direction DR. The distal ends of the lugs Gl, G2 may be received in two holes T1, T2, in particular blind holes in the second member 601.

[0104] Thus, in [Fig.8] in particular, it is noted that the first hole T1 (respectively the second opening T2) is of a size that is excessive compared to the cross-section of the first lug G1 (respectively of the second lug G2) so as to allow limited angular stroke between the first organ 600 and the second organ 601.

[0105] Generally, the first organ and the second organ can be made of plastic, manufactured in particular by molding typically by injection.

[0106] The blocking element 602, as well as the fixed support, thin, can be obtained from cutting operations of a mechanical sheet.

[0107] Cutting the sheet allows obtaining a one-piece blocking element 602, including in particular the radial projections SI, S2, the first and second shoulder Epi, EP2, the central opening 6021, and the elastic portion 6020.

[0108] Cutting the metal sheet allows obtaining the portion of the fixed support 603 carrying the opening Ov, including any teeth d against which the locking element is secured. One fixing end 6030 of the fixed support is bent, for example, at 90°, or even less, such as 30° or 15°, relative to the plane of the fixed support carrying the opening Ov. This fixing end secures the support, typically by means of a fastener passing through a bore in the fixing end.

[0109] The present disclosure further relates to a motor vehicle seat comprising a seat and a backrest, as well as equipment according to this disclosure, comprising one or more articulation mechanisms, the first flange 400 attached to the seat 2 and the second flange 401 attached to the backrest 3, according to the first possibility, or conversely the first flange 400 attached to the backrest 3, and the second flange 401 attached to the seat 2 according to the second possibility. List of reference signs

[0110] -1: Seat, - 2: Seated, - 3. File, - 4. Continuous articulation mechanism, - 400, 401. First flask and second flask, - CRI, CR2. First and second toothed crown, - CLT2. Collet (second flange 401), - Pint. Inner sliding wall (of the first flange cooperating with an outer diameter of the eccentric cam) - Pext. Outer sliding wall - 402. Input member, - Ex. Eccentric cam - Nuy. Core, - COI, CO2 first and second wedge-effect sliding elements, - RExt. Spring, - Yl, Y2. First axis and second axis (first and second flange) - 5. Control rod, - 6. Control and locking device (external to the articulation mechanism(s)), - 600, 601. First organ and second organ (respectively follower and trainer, - 6000. Tubular opening of non-circular section, in particular of square section (of the first component) receiving the control rod of complementary section), - 6001. Elastic teeth, - 6002 cylindrical centering pin (of the first component), -6010 cylindrical recess (of the second component receiving the cylindrical centering pin) - 602. Locking element (rotationally fixed with the first locking element), - 6020 elastic portion - 603. Fixed support, - 6030. Fixing end (fixed support), - 6031. Guides, - PB. Locking position (of said locking element against the fixed support blocking the rotation of the control rod around its longitudinal axis), - PE. Retracted position (of said locking element at a distance from the fixed support, freeing the rotation of the control rod around its longitudinal axis) - Gl, G2. Guide means lugs (between the locking element and said first following member, allowing the movement of said locking element from a locking position to a retracted position), - DR. Radial direction of the displacement of the locking element relative to the first component imposed by the guiding means - Bl, B2. First and second means of stop (between the first following element and the second, driving element), - ME. Elastic means (constraining the second organ relative to the first organ in an intermediate position between a first limit switch and a second limit switch, - MR. Spring means (constraining said locking element from the retracted position releasing the rotation of the control rod to the locking position inhibiting the rotation of the control rod), -Cl, C2. First and second cam (constraining said locking element from the locking position to the retracted position respectively in the first and second end-of-stroke positions between the second and first members), -Epi, Ep2. First and second shoulder (of the locking element configured to cooperate with the first and second cams), -PLI, PL2. Plots (of the second component forming the first and second cams, or even in part the first and second stop means), - OV1, OV2. First and second openings (of the first organ, receiving the first and second pin), -T1, T2. Blind holes in the second organ, receiving the lugs of the guiding means - Ov. Opening (fixed support 603), -d. Teeth (fixed support 603), - SI, S2. Radial projections (of the blocking element 602), - BP. Bearing ring. [YES]

Claims

1. Demands Equipment for adjusting the inclination of a backrest (3) relative to a seat (2) of a chair (1) comprising one or more continuous articulation mechanisms (4), said or each articulation mechanism (4) comprising: - a first flange (400) and a second flange (401) configured to be attached respectively to the seat (2) and the backrest (3) according to a first possibility, or conversely attached respectively to the backrest (3) and the seat (2) according to a second possibility; - an input member (402), rotatably mounted, configured to be moved in a first direction of rotation, and in a second direction of rotation, and to cause the second flange (401) to move relative to the first flange (400), and wherein said input member (402) of the articulation mechanism, or said input members (402) of the articulation mechanisms are driven by a control rod (5), rotationally coupled with the input member of the articulation mechanism, or said input members (402) of the articulation mechanisms, the control rod (5) being pivotally mounted about a longitudinal axis of the rod, and in which said equipment includes a control and locking device (6), external to the articulation mechanism(s) (4), configured to ensure the control of the articulation mechanism(s) (4) when changing the inclination of the backrest relative to the seat, and the irreversibility of the articulation mechanism(s) by blocking the rotation of the control rod (5) when the control and locking device (6) is not actuated, the control and locking device comprising: - a first follower element (600), rotationally fixed to the control rod (5), and a second driver element (601), pivotally mounted with a limited angular stroke relative to the first element around the control rod (5), and wherein said first member (600) and second member (601) comprise first stop means (Bl) configured to ensure the rotational drive of the first member (600), follower, by the second member (601), driver, in the first direction of rotation, at a first end of rotational stroke of the second control member (601) relative to the first member (600), and second stop means (B2) configured to ensure the rotational drive of the first member, follower, by the second member, driver, in the second direction of rotation, at a second end of travel of the second control member relative to the first control member - elastic means (ME) constraining the second element (601) to rotation relative to the first element (600) in a rest position (PR), intermediate between the first end of travel and the second end of travel - a locking element (602) rotationally fixed to the first component (600), around the axis of the control rod, movable relative to the first component (601) in a radial direction (DR) to the axis of the control rod (5) by means of guide guides (G1, G2) between said locking element (602) and the first component (600), said locking element (602) being configured to lock onto a fixed support (603), fixed relative to the first flange (400) according to the first possibility, or onto a fixed support (603), fixed relative to the second flange (401) according to the second possibility, in a locking position of the locking element (602), under the action of a restoring force from spring means (MR) in order to ensure the rotational immobilization of the control rod (5) in the rest position (PR) of the second component (601) relative to the first component (600), - Cam means (Cl, C2) carried by the second member (601), configured to move said locking element (602) radially against the restoring force of the spring means (MR), from the locked position (PB) to at least one retracted position (PE) in which said locking element (602) is moved away from the fixed support (603), at least partially, releasing the rotation of the control rod (5) at least in the direction of rotation imposed by the second member (601), the driving member, said locking element (602) being retracted radially, by a first cam (Cl) when the second member (601) and the first member (600) are in the first end-of-stroke position, when driven in the first direction of rotation, and by a second cam (C2) when the second member (601) and the first member (600) are in the second end-of-stroke position, when driven, according to the second direction of rotation and in which the fixed support (603) includes an opening (Ov), centered around the longitudinal axis of the control rod (5), said opening (OV) having on an internal diameter a plurality of teeth (d) against which the locking member (602) comes to lock according to different discontinuous angular locking positions defined by the teeth, around the axis of the control rod (5), in said locking position (PB) and in which the fixed support (603) includes a first thin element extending along a first planar element, at the level of the opening, said locking member (602) is a second thin element extending along a second planar element, received in the opening (Ov), the first planar element and the second planar element, substantially coplanar, perpendicular to the axis of the control rod (5),the first flat element and the second flat element interposed between the first component (600) and the second component (601) of the control and locking device (6).

2. Equipment according to claim 1 wherein the thickness of the blocking element (602) is between 0.4 mm and 1.2 mm, such as for example between 0.5 mm and 0.8 mm and wherein the fixed support (603) is thicker than the thickness of the blocking element, by 0.2 mm to 0.6 mm relative to the thickness of the blocking element (602).

3. Equipment according to claim 1 or 2, wherein the distance 1 measuring the overall dimensions of the control and locking device (6) along the axis of the control rod (5), comprising the first member (600), the second member (601), the fixed support (603) and said locking element (602), is less than 24 mm, in particular less than 20 mm, such as less than 16 mm.

4. Equipment according to claim any one of claims 1 to 3, wherein said locking element (602) comprises two locking projections (SI, S2), distributed on either side of the radial direction (DR) imposed by the guiding means (G1, G2), both located on a first side with respect to a plane perpendicular to the radial direction passing through the axis of the control rod (5), the radial projections (SI, S2) configured to lock against the teeth (d) of the opening (Ov) in the angular positions discontinuous locking, in the locking position (PB) of the locking element.

5. Equipment according to claim 4, wherein said locking element (602) comprises two radial projections (SI, S2) configured to lock against two teeth (d) of the opening, the two projections located on a first side with respect to a third plane passing through the axis of the control rod (5) and perpendicular to the radial direction (DR), and wherein said locking element (602) has on the second side with respect to the third plane, an elastic portion (6020) elastically compressed against an edge of the opening of the fixed support (603) constituting the elastic means (ME) and the spring means (MR),

6. Equipment according to any one of claims 1 to 5, wherein the cam means (Cl, C2) comprise: - the first cam (Cl) configured to come into contact with a first shoulder (Epi) of the locking element (602), on one side of the plane passing through the radial direction (DR) and the axis of the control rod (5), when the second member (601) and the first member (600) are in the first end-of-stroke position, - the second cam (C2) configured to come into contact with a second shoulder (Ep2) of the locking element (702), on the other side of the plane passing through the radial direction (DR) and the axis of the control rod (5), when the second member (601) and the first member (600) are in the second end-of-stroke position.

7. Equipment according to claim 6, wherein the first cam (Cl) and the second cam (C2) are formed projecting from one face of the second member (601), projecting towards the first member (600), along the direction of the control rod.

8. Equipment according to claim 7, wherein the first stop means (B1) and the second stop means (B2) comprise: - a first opening (OV1) in a body of the first member (600), receiving the first cam (C1) in projection, - a second opening (OV2) in a body of the second member (601), receiving the second cam (C2) in projection, and wherein the pair first cam (C1) / first opening (OV1) and / or the pair second cam (C2) / second opening (OV2) are configured to limit the angular displacement of the second element (601) with respect to the first element (600) by defining the first limit switch and the second limit switch.

9. Equipment according to any one of claims 1 to 8 wherein the guiding means comprise two protruding lugs (Gl, G2) from one face of the first member (600) protruding towards the second member (601) and two notches in the locking element (602) cooperating respectively with the two lugs (Gl, G2).

10. Equipment according to claim 9, wherein the distal ends of the lugs (G1, G2) are received in two blind holes (T1, T2) of the second member (601)

11. Equipment according to any one of claims 1 to 10 in which the articulation mechanism (4) is a continuous articulation mechanism comprising a hypocycloidal gear connecting the first flange (600) to the second flange (601), said hypocycloidal gear comprising: - a first toothed ring (CRI), external, centered on a first axis (Yl) and formed on the first flange (400);- a second internal toothed ring (CR2), centered on a second axis (Y2), coaxial with the control rod (5), the second axis (Y2) parallel to the first axis and offset from the first axis (Y1) by an eccentric cam (Ex), said second toothed ring (CR2) being formed on the second flange (401) and having an inner diameter greater than the outer diameter of the first toothed ring (CR1), - said eccentric cam (Ex) rotatably mounted around the second axis (Y2) cooperating with the input member (402) which is pivotally mounted around the second axis (Y2), the input member configured to drive the eccentric cam in rotation around the second axis (Y2), in the first or second direction, thus ensuring the displacement of the first flange (400) relative to the second flange (401) according to a hypocycloidal movement imposed by the gear.

12. Equipment according to claim 11, wherein: - the first flange (400) comprises a first cylindrical housing centered on the first axis (Y1) - the second flange (402) comprises a second annular housing centered on the second axis (Y2), delimited on the one hand, by the second toothed crown (CR2) and, on the other hand, by a collar (CLT2), and in which the second housing receives the first crown (CRI) of the first flange (400) and in which said eccentric cam (Ex) comprises an external diameter, configured to slide on an internal sliding wall (Pint) of the first cylindrical housing of the first flange (400), and an internal diameter configured to slide on an external sliding wall (Pext) of the collar (CLT2).

13. Equipment according to claim 12, wherein said eccentric cam has backlash compensation comprising: - a core (Noy), comprising an inner wall configured to pivot on an outer sliding wall of the collar (CL2), and an outer wall - two sliding elements (COI, CO2), having a wedge function, disposed between, on the one hand, the inner sliding wall of the first housing and the core, configured to slide internally on the outer wall of the core (Noy) and externally on the inner sliding wall (Pint) of the first housing, - a spring (Rext) disposed between the two sliding elements (COI, CO2) and forcing the sliding elements to a mutual separation, and wherein a first of the sliding elements (COI, CO2) is configured to block rotation of the eccentric cam relative to the first flange (400), in the first direction of rotation, by wedge effect between the sliding element,on the one hand between the outer wall of the core (Noy) and the inner sliding wall (Pint) of the first flange (400), and wherein a second of the sliding elements (COI, CO2) is configured to block a rotation of the eccentric cam (Ex) relative to the first flange (400), in the second direction of rotation, by wedge effect between the sliding element on the one hand between the outer sliding wall of the core (Noy) and the inner sliding wall (Pint) of the first flange, and wherein the input member (402) is configured to come against the first sliding element (COI) by bringing it closer to the second sliding element (CO2), releasing the rotation and causing the rotation of the eccentric cam (Ex) in the first direction of rotation, when the input member is driven by the control rod (5) in the first direction of rotation, and in which the input member (402) is configured to come against the second sliding element (CO2) by bringing it closer to the second sliding element (COI), releasing the rotation and causing the rotation of the eccentric cam (Ex) in the second direction of rotation, when the input member is driven by the control rod (5) in the second direction of rotation.

14. Equipment according to any one of claims 1 to 13, wherein the second element (602) is a rotary knob, manually operated by an operator, around the axis of the control rod (5).

15. Equipment according to any one of claims 1 to 14 comprising centering means between the first member (600) and the fixed support (603), centered around the axis of the control rod (5), for example in the form of guide(s) (6031) of the fixed support (603), distributed around the axis of the control rod (5) and cooperating in the guidance with a circular peripheral edge of the first member (600).

16. Motor vehicle seat comprising a seat and a backrest, as well as equipment according to any one of claims 1 to 15, comprising one or more articulation mechanisms, the first flange (400) integral with the seat (2) and the second flange integral with the backrest (3) according to the first possibility, or conversely the first flange (400) integral with the backrest, and the second flange (401) integral with the seat, according to the second possibility.

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