FR3043954A1 - VEHICLE SEAT AND METHOD OF ADJUSTING A VEHICLE SEAT - Google Patents

Abstract

Vehicle seat and method of adjusting a vehicle seat comprising a hinge mechanism (18), a guide mechanism (20), a single actuating device (22), and a transmission member (44) actuated by the actuating device (22) in a first transmission range, wherein the transmission member drives the locking device (28, 36) of one of the guide or articulation mechanisms (20, 18). ) to the unlocking position, and in a second transmission range, in which the transmission member drives the locking device of the other of the guide or articulation mechanism (20, 18) towards the unlocking position, the locking devices being simultaneously in the unlocking position in the second transmission range.

Description

Vehicle seat and method of adjusting a vehicle seat.

The present invention relates to a vehicle seat and a method of adjusting such a vehicle seat.

More particularly, the invention relates to a vehicle seat comprising: - a seat, - a backrest pivotally mounted on the seat, - a hinge mechanism adapted to adjust the angular position of the backrest relative to the seat, the articulation mechanism comprising: a first frame intended to be fixed on the seat and a second frame intended to be fixed on the backrest; - a first device for locking the angular position of the second frame with respect to the first frame the first locking device being movable between a locking position in which the angular position of the second armature relative to the first armature is fixed and an unlocking position in which the second armature is movable relative to the first armature; a guiding mechanism comprising: a slideway comprising a first profile and a second section extending according to a longitudinal direction and slidably mounted relative to each other in the longitudinal direction, and - a second locking device movably mounted between a locking position, in which the position of the second section relative to the first section is locked, and an unlocking position, in which said second locking device allows the second section to move relative to the first section, and - a single actuating device.

There are such vehicle seats including an actuating device adapted to operate selectively to control either the release of the backrest or unlocking the slide. These seats do not allow simultaneous movements, which can have an impact on the speed of execution of a comfort adjustment of a seat or a rear seat access adjustment.

Document US7374243B2 describes an example of a vehicle seat with an actuating device acting on the relative position of a first rail section relative to a second rail section and on the relative position of the seat and the backrest for the folding the seat to allow a wider passage to a vehicle occupant to enter the interior passenger compartment of a vehicle. The system described in US7374243B2 comprises a sensor and a servo loop preventing premature translation of the seat before the backrest and the seat is folded down. This type of system is heavy to implement and complex, with the use of a large control unit, and finds an application only for the retraction of a motor vehicle seat.

The present invention is intended in particular to reduce the complexity of the mechanisms of articulation and guiding of vehicle seats. The present invention makes it possible, in particular, to combine both simplicity of operation, adjustment assistance and speed of operation of a vehicle seat comprising articulation and guiding mechanisms. For this purpose, according to the invention, a seat of the kind in question is characterized in that it further comprises: a transmission member actuated by the actuating device: in a first transmission range, in which the body transmission means drives one of the first and second locking devices to the unlocking position, and in a second transmission range, wherein the transmission member drives the other of the first and second locking devices to the unlocking position. while maintaining the unlocking position of one of the first and second locking devices, the first and second locking devices being simultaneously in the unlocking position in the second transmission range.

Thanks to these arrangements, a simple seat is made to implement, with a reduced number of parts while ensuring a safe operation of the device, a simple maneuverability for a user and increased comfort. Reducing the number of parts also reduces the weight and bulk of such systems. In addition, it is possible to increase the speed of execution of the adjustment by ensuring a possible simultaneous unlocking of the backrest relative to the seat and the second section relative to the first profile.

In preferred embodiments of the invention, one or more of the following provisions may also be used: the transmission member is actuated by the actuating device successively in the first transmission range, then in the second transmission range; - The transmission member is rotatably mounted about an axis of rotation and moves in the first transmission range in a first direction of rotation on a first angular range and in the second range of transmission in the first direction of rotation on a second angular range, the second angular range extending from the first angular range; - The first locking device comprises a drive member assembled on the transmission member, for controlling the unlocking of the second armature relative to the first armature; the driving member is a cable; the cable comprises a first end and a second end, the first end being coupled to the transmission member, the second end cooperating directly with the first locking device; the first end comprises a cable holding pin on the first end; transmission member so that the rotation of the transmission member in the first direction on the first angular portion causes a winding of the cable around the transmission member; - The second locking device comprises an unlocking member and an unlocking pin, the unlocking member is movably mounted between an inactive position in which it is remote from the unlocking pin and an active position in which it exerts a force on the unlocking pin; - The transmission member comprises a transmission surface and the cable holding pin interacts with the transmission surface when the transmission member moves in the first direction on the first angular portion; - The transmission surface comes into contact with the unlocking member to move it from the inactive position to the active position when the transmission member moves in the first direction on the second angular portion; the seat further comprises a system for locking the retaining pin at the interface between the first and the second angular range; the actuation device is an electric actuator.

The present invention also relates to a method for adjusting the position of a seat as described above comprising the following successive steps: - actuate the transmission member in the first operating range, - actuate the transmission member in the second range of operation, so as to simultaneously obtain an unlocking position of the first and second locking device. Other features and advantages of the invention will become apparent from the following description of one of its embodiments, given by way of non-limiting example, with reference to the accompanying drawings.

In the drawings: - Figure 1 is a schematic view of a vehicle seat according to the invention comprising a guide mechanism, a hinge mechanism and an actuating device, - Figure 2 is an enlarged perspective view. of the guiding mechanism, the articulation mechanism and the actuating device comprising a transmission member of FIG. 1, FIGS. 3A, 3B, 3C are schematic views of detail according to the reference III of FIG. first, second and third positions of the transmission member.

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

In the description which follows, when reference is made to absolute position qualifiers, such as the terms 'forward', 'backward', 'up', 'down', 'left', 'right', etc., or relative, such as the terms 'above', 'below', 'above', 'below', etc., or with qualifiers for orientation, reference is made to a seat in a normal position of use of that in the direction of ordinary progression of the vehicle.

In the present case, in the following description, the term 'locking device' will have to be interpreted in a broad sense to describe a device adapted to perform an action intended to make immobile or to make mobile, a first element with respect to a second element, regardless of the relative initial position of the first and second elements.

Similarly, in the following description, the terms 'unlocking member' and 'unlocking member' of a first element with respect to a second element will have to be interpreted in a broad sense to describe a suitable member for implementing an action related to the first and / or second element for moving the first element relative to the second element irrespective of the initial relative position of the first element relative to the second element.

Figure 1 is a schematic view of a seat 1, in particular a seat 1 of the vehicle according to the invention. More particularly, FIG. 1 shows the seat 1 comprising a backrest 12 pivotally mounted about at least one pivot axis Y1 on a seat 14. The seat 14 is itself mounted to move in translation on a fixed structure 16, in particular a floor of the vehicle.

The seat 1 is such that it is possible to adjust an inclination R of the backrest 12 relative to the seat 14 and a position P of the seat 1 relative to the fixed structure 16.

In this case, the seat 1, as shown in particular in Figure 1, comprises a hinge mechanism 18 adapted to adjust the inclination R of the backrest 12, a guide mechanism 20 adapted to adjust the position P of the seat 1 relative to the fixed structure 16 and an actuating device 22 (visible in Figure 2).

The hinge mechanism 18 comprises a first frame 24. The first frame 24 is secured to a structural element of the seat 14. For example, the first frame 24 may be formed by a disk-shaped metal flange having for normal pivot axis Y1.

The articulation mechanism 18 comprises a second armature 26. For example, the second armature 26 is secured to a structural element of the backrest 12. The second armature 26 may be, for example, formed by a disk-shaped metal flange having as its normal pivot axis Y1.

The first armature 24 and the second armature 26 are rotatably mounted relative to each other about the pivot axis Y1. For example, the first frame 24 and the second frame 26 may be interconnected by a rotation device (not shown) providing easy rotation between the first frame 24 and the second frame 26. This rotation device is conventional and will not not described in more detail.

The hinge mechanism 18 further comprises a first locking device 28 adapted to maintain or define an angular position of the second frame 26 relative to the first frame 24. Thus, a user of the seat 1, after having chosen the position angular back 12 relative to the seat 14 which suits him can lock (or block) this angular position and make it stable. More specifically, the first locking device 28 is movable between a locking position and an unlocking position. In the locking position, the first locking device 28 fixes the angular position of the second armature 26 relative to the first armature 24. Thus, in the locking position of the first locking device 28, the second armature 26 can not move. relative to the first armature 24 around the pivot axis Y1. In other words, the backrest 12 can not move relative to the seat 14. For example, the first locking device 28 acts on the rotation device (not shown) by means of a lock or any another type of structure blocking the rotation. This lock or rotational locking structures are conventional and will not be described in more detail. In the unlocking position, the first locking device 28 allows the second armature 26 to move relative to the first armature 24 around the pivot axis Y1.

The first locking device 28 may be biased resiliently toward the locking position. Thus, the locking position is a so-called "stable" position. However, in alternative embodiments, the first locking device 28 may not be resiliently biased towards a particular position, or have two so-called "stable" positions, such as, for example, the locking position and the unlocking position.

The seat 1 comprises, as mentioned above, a guiding mechanism 20. The guiding mechanism 20 comprises a slide 30. The slide 30 makes it possible to adjust, for example, the position P of the seat 1 with respect to the fixed structure 16 , in particular the floor of the vehicle, by sliding in a longitudinal direction X of the slideway, in particular in a first direction XI (in this case towards the rear) and in a second direction X2, opposite to the first direction XI (in the occurrence to the front).

The slideway 30 comprises a first section 32 and a second profile 34. The first profile 32 and the second profile 34 extend in the longitudinal direction X. The first profile 32 and the second profile 34 are slidably mounted relative to each other. the other in the longitudinal direction X, in a first direction XI and a second direction X2. For example, the second profile 34 is assembled integral with a structural element of the seat 14. Similarly, the first section 32 is, for example, integral with the fixed structure 16, in particular integral with the floor of the vehicle. As a result, the first section 32 is also called a fixed or lower profiled section. Similarly, it follows that the second section 34 is also called mobile section or upper section.

In order to prevent the second section 34 from sliding relative to the first profile 32, the guiding mechanism 20 further comprises a second locking device 36.

The second locking device 36 is movably mounted between a locking position and an unlocking position. In the locking position, the second locking device 36 locks the position of the second profile 34 relative to the first profile 32, thus preventing any relative movement along the longitudinal axis X of the second profile 34 with respect to the first profile 32. unlocking position, the second locking device 36 allows the second section 34 to move relative to the first profile 32.

The second locking device 36 can be resiliently biased towards the locking position. Thus, the locking position is a so-called "stable" position. However, in alternative embodiments, the second locking device 36 may not be resiliently biased towards a particular position, or have two so-called "stable" positions, such as, for example, the locking position and the unlocking position.

The guiding mechanism 20 and the articulation mechanism 18 are actuated by a single actuating device 22. In other words, the actuating device 22 can ensure the displacement of the first locking device 28, in particular towards a unlocking position and the second locking device 36 to an unlocked position.

The actuating device 22 may be an electric actuator. However, in alternative embodiments, the actuating device 22 may be a piezoelectric motor, and pneumatic or hydraulic type motors may also be envisaged. The actuator 22 may also be composed of a shape memory alloy adapted to deform under particular external conditions so as to transmit motion. The actuating device 22 may also take the form of any element able to set in motion the second locking device 36 and the first locking device 28.

The actuating device 22 is, for example, fixed on the slideway 30, as shown in FIG. 2. However, in alternative embodiments, the actuating device 22 can be fixed on the backrest 12 or near the backrest. 12 or near the first armature 24 and the second armature 26.

The actuating device 22 actuates a transmission member 44. The transmission member 44 is actuated in a first transmission range, in which it drives one of the first and second locking devices 28, 36 to the unlocking position. and in a second transmission range, in which it drives the other of the first and second locking devices 36, 28 to the unlocking position while maintaining the unlocking position of one of the first and second locking devices 28, 36.

The actuating device 22 can be controlled by the user via a control means. For example, the actuating device 22 is controlled by means of a single control member 40 which makes it possible to operate the transmission member in the first transmission range and then in the second transmission range. In an alternative embodiment, the actuating device can be controlled by a first control member which makes it possible to operate the transmission member in the first transmission range only and by a second control member (not shown) which allows to operate the transmission member in the first transmission range and then in the second transmission range. The second transmission range extends from the first transmission range.

In the following description, the transmission member 44 is actuated in the first transmission range, in which it drives the first locking device 28 to the unlocking position and in the second transmission range, in which it drives the second locking device 36 to the unlocking position while maintaining the unlocking position of the first locking device. However, in an alternative embodiment, the transmission member 44 can be actuated in the first transmission range, in which it drives the second locking device to the unlocking position and in the second transmission range, in which it drives. the first locking device to the unlocking position while maintaining the unlocking position of the second locking device. The transmission member 44 in the first transmission range acts on the first locking device 28 to cause a movement of the first locking device 28 to the unlocking position, so as to release the movement of the first armature 24 relative to to the second armature 26. In the second transmission range, the first locking device 28 is held in the unlocking position and the transmission member 44 acts on the second locking device 36 to cause a displacement of the second locking device 36 to the unlocking position, so as to release the movement of the second section 34 relative to the first section 32. Thus, in the second transmission range the first and second locking devices 26, 36 are simultaneously in the unlocking position. The transmission member 44 thus makes it possible to transmit a movement of the actuating device 22 to the first locking device 28 and to the second locking device 36.

In this case, the transmission member 44 is actuated by the actuating device 22 successively in the first transmission range, then in the second transmission range. The transmission member 44 is in the example shown in Figures 2, 3A, 3B, 3C rotatable about an axis of rotation of Y2 transmission member. The transmission member 44 moves in particular in a first direction of rotation W1 on a first angular range and on a second angular range, the second angular range extending from the first angular range. In this case, in the first transmission range, the transmission member moves in the first direction W1 in the first angular range. In the second transmission range, the transmission member moves in the first direction W1 in the second angular range. The transmission member 44 is, for example, as illustrated in FIGS. 2, 3A, 3B, 3C, a cam 44.

In the following description, the transmission member 44 is a cam 44. However, in alternative embodiments, all known types of transmission member may be envisaged, in particular translationally mobile transmission members.

For example, the cam 44 comprises two portions 50, 52, advantageously substantially semi-circular, and in particular preferably the first portion 50 of the cam 44 has a radius greater than the second portion 52 of the cam 44. A recess 54, 56 can be provided between the two portions 50, 52 of the cam 44. More specifically, a first recess 54 and a second recess 56 may be provided. The recesses 54, 56 ensure the continuity of the cam profile between the first portion 50 and the second portion 52.

The first recess 54 may form a transmission surface S of the cam 44 for transmitting a movement to the first locking device 28 when the cam 44 is moved in the first direction W1 in the first angular range PI and the second locking device 36 when the cam 44 is moved, always in the first direction W1, in the second angular range P2. The cam 44 is moved in the first direction W1 by the actuating device 22.

In the embodiment shown in Figure 2, the actuating device 22 comprises an actuating rod 58 movable in rotation. A transmission system 60 is directly assembled on the actuating rod 58. The transmission system 60 is adapted to transmit the movement of the actuating rod 58 to a cross member 64 on which the transmission member 44 (or cam 44) as shown in the figures) is directly fixed.

The cross-member 64 is thus rotatable about a transverse axis (which is in this case parallel to the axis of rotation of the transmission member Y2).

The transmission system 60 may, for example, and as illustrated in FIG. 2 in particular comprise a wheel and worm system 60. A reduction member 62, for example a geared motor 62, in particular a geared motor gearbox 62 can be arranged following the wheel and worm gear 60.

The actuating rod 58 is rotatable about its axis, in particular in a first direction of rotation SI. The transmission system 60 thus transmits to the cross member 64, and therefore to the cam 44, a rotational movement in the first direction of rotation W1.

For example, a return spring 66 is provided, so as to allow, in particular in the absence of a supply, a springback of the actuating device 22 to a rest position, in which the actuating device 22 exerts no effort on the cam 44.

In an alternative embodiment, the actuating device and the transmission system, and / or the reduction member may be reversible. Thus, the actuating rod 58 can be rotatable about its axis in a first direction of rotation S1 and in a second direction of rotation S2, the first direction of rotation S1 being opposite the second direction of rotation S2. Thus, for example, when the actuating rod 58 is actuated in the first direction Si, it actuates the unlocking position of the first and the second locking device.

When the actuating rod 58 is actuated in the second direction of rotation S2, opposite the first direction SI, it can for example actuate the locking position of the second and the first locking device, if the locking positions of the first and second locking devices 28, 36 are not 'stable'.

In an alternative embodiment, when the actuating rod 58 is actuated in the second direction of rotation S2, opposite the first direction SI, it can for example actuate the transmission member in the second direction W2, the transmission member then, for example, firstly driving the second locking device to the unlocking position, then in a second step driving the first locking device to the unlocking position.

In this case, in the absence of actuation of the actuating device 22, the cam 44 is in a neutral position, in which it does not control either the first locking device 28 or the second locking device 36. Neutral cam is visible in particular in Figure 3A.

As stated above, the transmission surface of the cam 44 allows the transmission of a control movement of the first locking device in a first step (in the first angular range PI), and the second locking device in a second time (in the second angular range P2), the first locking device 28 remaining in the unlocking position when the second locking device 36 is actuated to an unlocking position.

As shown in FIGS. 2 and 3A, 3B, 3C, the first locking device 28 comprises a drive member 68 assembled on the transmission member 44. In this case, the driving member 68 is assembled on the transmission surface S of the transmission member 44 formed at least in part by the first recess 54.

As shown in Figures 2 and 3A, 3B, 3C, the drive member 68 comprises a cable 68. The cable 68 extends longitudinally between a first end 70 and a second end 72. The first end 70 of the cable 68 is connected to the cam 44. For example, the first end 70 of the cable 68 comprises a retaining pin 74 or a bent portion which retains the cable 68 on the cam 44, in particular when the cam 44 is in the neutral position and in the the first angular range. The second end 72 of the cable 68 is arranged towards one of the first armature 24 or the second armature 26. For example, in the case of a rotation device ensuring easy rotation between the first armature 24 and the second armature 26, the second end 72 of cable 68 is arranged directly in the vicinity of a lock or unlocking pin unlocking the first locking device 28. However, other locking mechanisms can be envisaged.

A displacement of the cam 44 in the first direction in the first angular range PI causes a winding of the cable 68, in particular partly around the first portion 50 of the cam 44. The first cam portion 44 comprises, for example, a groove 76 on the outer surface and the cable 68 is housed in the groove 76. The groove 76 allows a retention of the cable 68 around the cam 44. The winding partly around the cam 44 of the cable 68 causes a force traction on an element inside or near the first and second armatures 24, 26. More specifically, when the cable 68 is wound in part around the cam 44 the second end 72 of the cable 68 is adapted to exert a pulling on an unlocking peg or similar element to come unlock the angular position of the second frame 26 relative to the first frame 24.

In the case of a first locking device 28 resiliently biased towards the locking position, while partly wrapping around the cam 44, the cable 68 exerts a tensile force, in particular against the elastic biasing to the locking position, to cause the first locking device 28 to move from the locking position to the unlocking position.

A displacement of the cam 44 in a second direction W2, opposite to the first direction W1, towards the neutral position causes a "unwinding" of the cable 68, and the first locking device 28, for example resiliently biased towards the locking position, can return to the locking position, the tensile force described above is no longer applied.

The actuating device 22 actuates the cam 44 in a first direction on the first angular range PI and can also actuate the cam, always in the first direction W1 on the second angular range P2, the second angular range P2 following the the first angular range PI.

The second locking device 36 comprises, for example, as shown in Figures 2 and 3A, 3B, 3C in particular, an unlocking member 78 and at least one unlocking pin 80. The unlocking member 78 is movably mounted between an active position and an inactive position. For example, in the inactive position, the unlocking member 78 is at a distance from the unlocking pin 80. The locked position can be a so-called "stable" position of the locking device 36, for example, by being elastically biased towards the position locked. Thus, in the absence of any effort on the unlocking pin 80 (in other words when the unlocking member is remote from the unlocking pin), the second section 34 remains in a locked position relative to the first section 32.

In the active position of the unlocking member 78, the unlocking member 78 exerts a force on the unlocking pin 80. By exerting a force on the unlocking pin 80, the unlocking member 78 forces the unlocking pin 80 to go against the elastic biasing now the first section 32 fixed relative to the second section 34, allowing a first displacement of the first section 32 relative to the second profile 34. The unlocking member 78 is, for example, pivotally mounted between the inactive position and the active position, as visible in particular in Figures 2, 3A, 3B and 3C. The unlocking member 78 comprises a portion adapted to come into contact, for example, in sliding contact with the cam. More particularly, the locking member 78 comprises a portion adapted to come into sliding contact with the transmission surface of the cam 44.

When the cam 44 moves in the first direction W1 on the first angular range Pl, the transmission surface of the cam 44 is remote from the locking member so that the locking member 78 is held in its inactive position. .

When the cam 44 arrives at the interface between the first angular range P1 and the second angular range P2, the holding pin 74 slides on the transmission surface. The retaining pin is held at the interface between the first angular range and the second angular range in position by a locking system 84 of the holding pin 74. In this case, the transmission surface S has a slope. The slope of the transmission surface S, when the cam 44 is in an intermediate position between the first angular range PI and the second angular range P2 (shown in particular in FIG. 3B) is such that the coefficients of friction between the retaining pin 74 and the transmission surface S do not allow the maintenance of the retaining pin on the transmission surface S. At the interface between the first angular range PI and the second angular range P2, the retaining pin 7 4 slides for example on a gutter or other organ that allows it to remain in position. The locking pin 84 of the holding pin 74 blocks the retainer pin in its position at the interface between the first and the second angular range. In other words, when the cam 44 moves in the second angular range PI, it no longer causes the holding pin 74 which is held in a "powered" position by the first locking device 28. Thus, when the cam 44 moves in the second angular range P2, the retaining pin continues to exert a tensile force on the unlocking peg or similar element to continue to maintain the unlocking position of the first locking device 28, and so to maintain unlocked the angular position of the second armature 26 relative to the first armature 24.

When rotating in the first direction W1 on the second angular range P2, the cam 44 also exerts a force on the unlocking member 78 so as to rotate it from the inactive position to the active position, as visible on Figure 3C.

More specifically, the part of the unlocking member 78 in sliding contact on the surface of the cam 44 is "raised" during the rotation of the cam in the first direction W1 on the second angular range P2. This lifting causes the unlocking member 78 to pivot and a portion of the unlocking member 78 facing the unlocking pin 80 is pressed on the unlocking pin 80 and transmit a force on the unlocking pin 80. Thus, the second section 34 is unlocked with respect to the first profile 32.

It follows from the foregoing that a single actuating device 22 controls the unlocking of the first locking device 28 and the unlocking of the second locking device 36. In addition, the actuating device 22 first unlocks one locking devices 28, 36 (in this case in the example described first) then, while keeping the unlocking device in the unlocked position, unlocks the other locking devices.

The actuating rod 58 can be actuated only in one direction of rotation (in this case the first direction of rotation W1) to control the first locking device 28 and then the second locking device 36. Optionally, only the first device locking 28 can be controlled. In addition, in the example as shown, the second locking device 36 can not be controlled in an unlocking position if the first locking device is not already in an unlocking position.

The actuating device 22 thus successively actuates firstly the first locking device 28 and then the second locking device 36, the first locking device remaining in the unlocked position when the first locking device is unlocked.

As mentioned above, in an alternative embodiment (not shown), the actuating device could first actuate the second locking device and then the first locking device.

As shown in part in Figure 2, a second slide 82 may be provided. The second slide 82 is arranged parallel to the first slide 30 described above and is substantially similar to it. The second slideway 82 comprises a first profile 32 'and a second profile 34' extending in the longitudinal direction X and slidably mounted relative to each other in the longitudinal direction X. The second profile 34 'of the second Slide 82 can be secured to the first frame 24 of the hinge mechanism 18. The second slide 82 can cooperate with a third locking device 36 'adapted to lock the position of the second section 34' relative to the first section 32 '. The third locking device 36 ', in order to act synchronously with the second locking device 36, is connected to the second locking device 36 of the first slideway through the crossbar 64.

To adjust the position of the vehicle seat 1 previously described, various steps can be implemented.

In a first step, the actuating device 22 is controlled, for example by means of the control member 40, in order to actuate the transmission member 44 in the first transmission range and thus allow the movement of the first armature relative to the second armature, ie the displacement of the second section 34, 34 'relative to the first section 32, 32'. Allow the displacement of the second armature 26 relative to the first armature 24 thus makes it possible to adjust the angular position of the backrest 12 with respect to the seat 14. In particular, the first armature 24 can be moved relative to the second armature 26. a certain angular deflection, for example less than 150 °, advantageously less than 120 °, more particularly less than 90 ° or even less than 50 °, or even less than 30 °. The displacement of the second profile 34, 34 'with respect to the first profile 32, 32' makes it possible to adjust the position P of the seat 14 of the seat 1 with respect to the fixed structure 16 in the longitudinal direction X.

In a second step, the actuating device 22 is controlled, for example always by means of the control member 40, in order to actuate the transmission member 44 in the second transmission range and thus allow the displacement in the position of unlocking the locking device not yet in the unlocking position.

In addition, it is possible to perform the first step only, without implementing the second step.

Claims (10)

Vehicle seat (1) comprising: - a seat (14), - a backrest (12) pivotally mounted on the seat (14), - a hinge mechanism (18) adapted to adjust the angular position of the backrest (12) relative to the seat (14), the articulation mechanism (18) comprising: - a first frame (24) intended to be fixed on the seat (14) and a second frame (26) intended to to be fixed on the backrest (12), - a first locking device (28) for the angular position of the second armature (26) relative to the first armature (24), the first locking device (28) being movable between a locking position in which the angular position of the second armature (26) relative to the first armature (28) is fixed and an unlocking position in which the second armature (26) is movable relative to the first armature (24); ), - a guiding mechanism (20) comprising: - a slide (30) comprising a p first profile (32) and a second profile (34) extending in a longitudinal direction (X) and slidably mounted relative to each other in the longitudinal direction (X), and - a second locking device ( 36) movably mounted between a locking position, in which the position of the second profile (34) relative to the first profile (32) is locked, and an unlocking position, wherein said second locking device (36) allows the second profile (34) to move relative to the first profile (32), and - an actuating device (22), unique, characterized in that the seat (1) further comprises - a transmission member (44) actuated by the actuating device (22): in a first transmission range, wherein the transmission member (44) drives one of the first and second locking devices (28, 36) to the unlocking position, and - in a second transmission range ission, wherein the transmission member (44) drives the other of the first and second locking devices (36, 28) to the unlocking position while maintaining the unlocking position of one of the first and second locking devices. locking (28, 36), the first and second locking devices (28, 36) being simultaneously in the unlocking position in the second transmission range. 2. Seat (1) according to claim 1, wherein the transmission member (44) is rotatably mounted about an axis of rotation (Y2) and moves in the first transmission range in a first direction of rotation ( W1) on a first angular range (P1) and in the second transmission range in the first direction of rotation (W1) on a second angular range (P2), the second angular range (P2) extending from the first angular range (PI). 3. Seat according to claim 1 or 2, wherein the first locking device (28) comprises a drive member (68) assembled on the transmission member (44) for controlling the unlocking of the second armature (26). relative to the first armature (24). 4. Seat (1) according to the preceding claim, wherein the drive member (68) is a cable (68). 5. Seat according to the preceding claim, wherein the cable (68) comprises a first end (70) and a second end (72), the first end (70) being coupled to the transmission member (44), the second end (70) being end (72) cooperating directly with the first locking device (28), and wherein the first end (70) has a retaining pin (74) of the cable (68) on the transmission member (44) so as to that the rotation of the transmission member (44) in the first direction (W1) on the first angular portion causes a winding of the cable (68) around the transmission member (44). 6. Seat according to any one of the preceding claims, wherein the second locking device (36) comprises an unlocking member (78) and an unlocking pin (80), the unlocking member (78) is movably mounted. between an inactive position in which it is remote from the unlocking pin (80) and an active position in which it exerts a force on the unlocking pin (80). Seat according to claims 5 and 6, wherein the transmission member (44) has a transmission surface (S) and the cable holding pin (74) cooperates with the transmission surface when the transmission member (44) moves in the first direction (W1) on the first angular portion (PI), and wherein the transmission surface (S) comes into contact with the unlocking member (78) to move it from the inactive position to the active position when the transmission member (44) moves in the first direction (W1) on the second angular portion (P2). Seat (1) according to claim 5 or claim 7, further comprising a locking system (84) of the retaining pin (4) at the interface between the first angular range (PI) and the second angular range ( P2). Seat (1) according to one of the preceding claims, wherein the actuating device (22) is an electric actuator. 10. A method for adjusting the position of a seat (1) according to any one of the preceding claims comprising the following successive steps: - actuate the transmission member (44) in the first transmission range, - actuate the organ transmission (44) in the second transmission range, so as simultaneously to obtain an unlocking position of the first and second locking device (28, 36).