FR3013008A1 - VEHICLE SEAT AND VEHICLE COMPRISING SUCH A SEAT - Google Patents

Abstract

Vehicle seat comprising a backrest carried by legs (8), a crossbar (20) fixed to the floor of the vehicle, a force recovery system (40) including a stop (41) and a counterbutt (42) connected respectively to the fixing crossbar and to one of the legs, the abutment and the abutment being adapted to bear against one another by limiting the displacement and / or the deformation of the crossmember under the effect, when said attachment beam undergoes a forward force (F) sufficient to move and / or deform it.

Description

FIELD OF THE INVENTION The present invention relates to the seats of a motor vehicle, to vehicles comprising such seats, and more particularly to the restraint of the occupants of such seats, in particular the children installed in seats. ISOFIX seats, especially in the event of a vehicle impact. BACKGROUND OF THE INVENTION More particularly, the invention relates to a vehicle seat comprising at least one backrest defining a front face adapted to serve as a support for a user, at least one base carrying said folder and intended to be fixed to a floor vehicle, a fastening crossbar, extending substantially in a transverse direction, at least one support plate attached to said mounting crossbar, said support plate being adapted to secure said cross member to the vehicle floor.

Vehicle seats are known comprising such a fastening crossbar directly fixed to the floor of the vehicle by a plurality of fastening systems. However, the sum of such fastening systems generates costs and increased weight of seats.

The present invention is intended to overcome these disadvantages. According to the invention, a seat of the type in question is characterized in that it further comprises at least one force-recovery system including at least one stop and at least one abutment, secured respectively to the attachment beam and said at least one base, and in that said abutment and said abutment 1 are arranged to abut one against the other, when the fixing crosspiece undergoes a displacement and / or a deformation under the effect of a forward force exerted on said cross-member, thus limiting said displacement and / or said deformation. Thus, thanks to these provisions, at least a portion of the fastening systems of the fastening beam on the floor of the vehicle is simple and light, thereby helping to lighten the seat and reduce the cost while ensuring a very good performance the tensile forces that may occur on said crossbar in case of impact. In various embodiments of the invention, one or more of the following provisions may also be used: the seat further comprises at least one anchor for a child seat, integral with the seat; crossbar and adapted to secure a child seat on the seat, the crossbar undergoing a displacement and / or deformation 20 when the forward force is exerted on said at least one child seat anchor; the fixing cross-member extends between first and second ends, the abutment being connected to an intermediate portion of the fastening cross-piece situated between the first and second ends of said fastening cross-member, and the backrest is carried by first and second side legs and at least one intermediate leg located between the first and second side legs, said first and second side legs and said intermediate leg being adapted to be fixed to said vehicle floor, the abutment being integral with said intermediate leg; - The stop is adapted to hook on the abutment when said abutment and said abutment 2 abut against each other under the effect of said forward force exerted on said cross member; the abutment has a U-shaped section comprising a core extending substantially in a vertical plane towards the front of the fastening cross-member and two lateral wings secured to the fastening cross-member, the abutment comprising at least one protruding beak towards the bottom and the soul of the abutment being arranged to hook under the spout under the effect of said forward force exerted on said crossmember; the lateral wings of the abutment have cutouts open towards the rear and towards the bottom which are engaged substantially without clearance on the fastening crosspiece, said lateral wings being welded to said cross-member; - The abutment comprises at least one tab projecting rearwardly relative to the base and comprising said spout; 20 - said tab is formed of sheet metal, one piece with the base; the backrest comprises first and second parts pivotably mounted independently of one another along an axis of rotation parallel to the transverse direction, said seat comprising first and second lateral legs and first and second intermediate legs situated between the first and second lateral legs, said first portion of the backrest being carried by the first lateral leg and the first intermediate leg, said second portion of the backrest being carried by the second lateral leg and the second intermediate leg, said first and second lateral legrests and said intermediate legs being adapted to be fixed to the floor of 3 vehicle, and the system of recovery of effort comprises two integral abutments respectively of the first and second intermediate legs, the soul of the abutment being arranged to come hang under the beaks the tabs of the abutments under the effect of said forward force exerted on said crossmember; - the seat also includes a seat; Furthermore, the invention further relates to a vehicle comprising a floor and a seat as defined above, said at least one base is secured to the floor of the vehicle. Of course, the various features, variations and / or embodiments of the present invention may be associated with each other in various combinations to the extent that they are not incompatible or exclusive of each other. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be better understood and other features and advantages will become apparent upon reading the following detailed description including embodiments given by way of illustration with reference to the accompanying figures, presented as nonlimiting examples, which may serve to complete the understanding of the present invention and the presentation of its realization and, where appropriate, contribute to its definition, in which: - Figure 1 is a side view of a seat FIG. 2 is a partial front perspective view of a seat according to the invention equipped with a force recovery system; FIG. 3 is a partial rear view in perspective of the seat according to the invention equipped with a system of recovery of effort, 4 - Figure 4 is a partial rear view of the seat according to the invention, - Figures 5 and 6 are exploded detail views of a force-recovery system, FIG. 7 is a detailed perspective view of the force-recovery system, in the rest position, FIG. 8 is a detailed view of perspective of the system of recovery of effort, in position of safety. It should be noted that, in the figures, the structural and / or functional elements 10 common to the various embodiments may have the same references. Thus, unless otherwise stated, such elements have identical structural, dimensional and material properties. For the sake of clarity, only the elements useful for understanding the described embodiments have been shown and will be detailed. DETAILED DESCRIPTION OF THE INVENTION In the following description, when reference is made to absolute position qualifiers, such as the terms 'forward', 'backward', 'high', 'low', 'left', 'right', etc., or relative, such as the terms 'above', 'below', 'above', 'below', etc., or at qualifiers for orientation, reference is made to a seat in a normal position of use thereof in the direction of ordinary progression of the vehicle. Thus, Figure 1 shows a schematic view of a motor vehicle seat, for example a seat 1, according to an embodiment of the present invention. Thus, Figure 1 shows the seat 1 comprising a backrest 2, with a front face 2a adapted to serve as a support for a user. The bench 1 further comprises a seat 3 fixed to the floor P of the vehicle 5, on which, for example, the backrest 2 can be mounted. The backrest 2 comprises a backrest frame 4, preferably rigid, on which a trim is mounted. The backing 5 may consist, for example, in a layer of synthetic foam or the like, advantageously molded, covered by a covering cap, in particular textile, leather or other. The seat 3 comprises a seat frame 3a, 10 preferably rigid, on which is mounted a seat pad 3b. The backrest frame 4 is pivotally mounted around an axis of rotation Y1 relative to the seat 3, for example, by means of a hinge mechanism so as to be able to adjust the inclination of the backrest 2 by 3. The hinge mechanism is attached to the backrest frame 4. In the embodiment shown, the hinge mechanism is attached to the backrest frame 4 via a frame 7. Optionally, as shown in FIG. 1, the seat 1 also comprises at least one headrest 6, and for example three headrests 6, arranged upwardly from the backrest 2, opposite the seat 3 relative to the backrest 2. The backrest frame 4 may comprise, for example, a first part 4a and a second part 4b of backrest frame 4, forming for example respectively 2/3 and 1/3 of the width folder. Said first portion 4a and said second portion 4b are pivotally mounted independently of one another along the axis of rotation Y1. The first and second parts 4a and 4b each comprise a reinforcing tube 9 comprising a straight lateral portion of tube 10 and a left lateral portion 6 of tube 11 extending respectively in a vertical direction Z from a first end 14 to a second end 15. More specifically, as shown in Figure 2, the first end 14 is disposed at the bottom of the backrest 2 and the second end 15 is disposed at the top of the backrest 2. The right side portion of the tube 10 and the portion left lateral tube 11 are interconnected by a lower portion of tube 12 and a top portion of tube 14, 10 extending in a transverse direction Y, substantially perpendicular to the vertical direction Z and substantially parallel to the axis of rotation Y1, and respectively arranged at the level of the first ends 14 and at the second ends 15 of straight lateral portion 15 of tube 10 and of the left side portion of tube 11. The upper portion of tube 14 carries, for example, at least one headrest 6 via support sleeves 6a. The reinforcing tube 9 may in particular be metallic. The first part 4a and the second part 4b each comprise, for example, a structural plate 16, extends substantially parallel to the front face 2a of the backrest 2. In addition, the reinforcing tube 9 of each of the first 25 and second parts 4a and 4b are integral with the structural plate 16. In the example shown, the backrest frame 4 can be carried by means of a minus one gusset 8 and, for example, a first gusset 8 lateral and a second gusset 8 side, and at least one gusset 8 intermediate between the first gusset 8 lateral and the second gusset 8 side, each of said gussets 8 being adapted to be connected to the floor P of the motor vehicle. Optionally, the backrest frame 4 is carried by means of, for example, a first lateral gusset 8 and a second lateral gusset 8, and a first intermediate gusset 8 and a second intermediate gusset 8 located between the first lateral gusset 8 and the second lateral gusset 8, the first intermediate gusset 8 being connected to said first part 4a and the second intermediate gusset 8 being connected to said second part 4b, each of said gussets 8 being adapted to be connected to the floor P of the motor vehicle. Each of the gussets 8 comprises a first face 8a extending substantially in the vertical direction Z, towards the floor P, and a second face 8b extending substantially in a longitudinal direction X, perpendicular to the vertical direction Z and perpendicular to the direction. transverse Y. The second face 8b of each of the gussets 8 is integral with the floor P of the vehicle. Optionally, the second face 8b of the first intermediate gusset 8 and the second face 8b of the second intermediate gusset 8 are integral with each other. The seat 1 is adapted to receive a child seat (not shown) which is supported on the seat 3 and the front face 2a of said backrest 2, said child seat 2 25 being able to receive and protect a child downstairs age. The child seat further comprises at least one retainer by means of which it is possible to firmly fix said child seat to the seat 1. In particular, this restraint can engage on a child seat anchor 30. which is secured to a cross member 20 of the seat 1 of the vehicle. More precisely this anchor 30 is located between the lower part of the backrest 2 and the rear portion of the seat 3. In general, a child seat is equipped with two restraint systems 8 as described above, and these restraint systems and the corresponding anchors have for the most part been standardized and are commonly referred to as ISOFIX fasteners.

The bench 1 comprises, between the lower part of the backrest 2 and the rear part of the seat 3, the crossbar 20 which extends substantially in the transverse direction Y. More particularly, the crosspiece 20 extends between a first end 21 and a second end 22. The attachment crossbar 20 comprises, for example, an intermediate portion 27 located between the first end 21 and the second end 22. In the embodiment shown, the intermediate portion 27 is located in view of the at least one intermediate gusset 8 and more particularly, facing the first intermediate gusset 8 and the second gusset 8 intermediate. The crossbar 20 is made in the illustrated example in the form of a metal tube of circular section. The fastening crosspiece 20 comprises at least one support plate 23. The support plate 23 secures said fastening crossbar 20 to the floor P of the vehicle and is, for example, made of metal. The support plate 23 comprises a first face 24 extending substantially in the vertical direction Z, from the crossbar 20 to the floor P, and a second face 25 extending substantially in the longitudinal direction X and integral with the floor P. In a preferred embodiment, the fixing crosspiece 20 comprises two support plates 23 and each of said support plates 23 is connected on the one hand to one of said first and second ends 21, 22 of the 9 20 and is, on the other hand, secured to the floor P. Optionally, as shown in Figures 2,3 and 4, each of the support plates 23 is connected to one of the side gussets 8. More particularly, the second face 25 of each of the support plates 23 is connected to the second face 8b of one of the side gussets 8. The shape of the crossbar 20 could be different from that of a ring section and could be square, rectangular, or some other shape. Each of the anchors 30 is, for example, fastened to the crossbar 20 and, in the embodiment shown, each of the anchors 30 is fixed by welding to the crossbar 20. In the illustrated example, each of the anchors 30 is a piece formed from a wire of constant section. Each of the anchors 30 comprises an attachment portion 31, for example U-shaped having a central section 32 extending parallel to the transverse direction Y and, on either side of this central section 32, two lateral branches 33, 34 extending perpendicular to the transverse direction Y, towards the rear of the seat 1, to a free end. This engaging portion 31 can be engaged in the retainer belonging to the child seat, and is held there by a locking system of the retainer (not shown). In addition, the free ends of the two lateral branches 33, 34 form, for example, an angled portion 35 adapted to be welded to the fastening crosspiece 20. The attachment portion 31 projects from the covering cap of the bench 1, so that the child seat restraint can engage on this hooking portion 31.10 The seat 1 further comprises at least one force recovery system 40. The recovery system of force 40 is adapted to stop the deformation of the crossbar 20 when a force F (Figure 8) to the front, greater than a predetermined value, is exerted on the crossbar 20. Alternatively, the recovery system of force 40 is adapted to stop the displacement of the crossbar 20 when a force F (Figure 8) forwards, greater than a predetermined value, is exerted on the crossbar 20. More particularly, the effort F is the effort t exerted forwardly on at least one of the anchors 30 by the child seat restraint during a front impact experienced by the vehicle (Figure 8). As can be seen in more detail in FIGS. 5 to 8, the force-recovery system 40 comprises, for example, at least one stop 41 and at least one abutment 42. In the embodiment shown, the stop 41 is connected to the crosspiece 20 and the abutment 42 is connected to at least one of the gussets 8. The abutment 42 extends opposite the abutment 41, radially to said abutment 41. More particularly, the abutment 41 is connected to the intermediate portion 27 of the cross member 20 and the abutment 42 is connected to the rear portion of the first face 8a of at least one intermediate gusset 8; thus improving the distribution of the force F exerted on the crossbar 20. The abutment 41 and the abutment 42 are adapted to abut against each other, especially in case of impact before the vehicle. More particularly, the stop 41 is normally in a rest position when the vehicle is in normal use, in which the stop 41 is away from said abutment 42 (FIG. 7). Said abutment 41 is movable in a safety position, in which said abutment 41 hooks onto said abutment 42 (FIG. 8) when said abutment 41 and said abutment 42 abut one another. The safety position is adapted to stop the movement and / or the deformation of the cross member 20, thus improving the retention of the occupants of the seat 1, especially in case of impact before the vehicle. The abutment 41 is a fastener having a fastening portion 43 adapted to receive the abutment 42. Said attachment portion 43, for example, substantially U-shaped comprises a core 44, extending substantially in a vertical plane towards the l front of the attachment crossbar 20, and, on either side of an upper portion of the core 44, two lateral wings 45, 46 extending perpendicular to the transverse direction Y, towards the crossbar 20 , to a free end. This attachment portion 43 can be engaged on the abutment 42 of the force-taking system 40. More particularly, the core 44 can bear against the abutment 42 of the force-recovery system 40.

The two lateral wings 45, 46 are secured to the fastening crossmember 20, more particularly the lateral wings 45, 46 are welded to the intermediate portion 27 of the crossmember 20, increasing the strength of the abutment 41.

Alternatively, the core 44 comprises an upper edge, said upper edge comprising a notch 44a located opposite the abutment 42 and adapted to receive said abutment 42 when said stop 41 is in the safety position. 12 Alternatively, the two lateral wings 45, 46 may have cutouts open towards the rear and down which are engaged substantially without play on the crossbar 20, increasing the strength of the stop 41. Alternatively, the intermediate portion 27 may have a smaller section relative to the rest of the crossbar 20. The abutment 42 has at least one tab 50, 10 projecting rearwardly relative to the gusset 8, from a first end secured to said gusset 8 until at a second free end. Said at least one tab 50 forms a hook, for example 3 to 5 mm thick, having a spout 51 oriented towards the floor 15 P. The core 44 of the abutment 41 coming to hook on said spout 51 in case of impact before, under the effect of said forward force F exerted on said at least one anchor 30 for child seat. Optionally, the tab 50 is formed of sheet metal, 20 in one piece with the gusset 8. Alternatively, the force recovery system 40 comprises two abutments 42. The first abutment 42 is integral with the first gusset 8 intermediate. The second abutment 42 is integral with the second intermediate gusset 8. The core 44 of the abutment 41 being arranged to hook under the beaks 51 of the lugs 50 of the first and second abutments under the effect of the forward force F exerted on the at least one anchor 30. The tabs 50 of the first and second abutments 42 project 30 parallel to each other. The device that has just been described operates as follows. As can be seen in FIG. 8, when the vehicle in which the seat 1 is installed is subjected to a front impact, the child seat retainer exerts forward force F for at least one anchors 30, so that the cross member 20 undergone significant localized traction forces. These tensile forces cause a displacement and / or a deformation of the crossbar 20 upwards and forwards. The displacement and / or the deformation of the crossbar 20 shifts the abutment 41 of the force transfer system 40 from its rest position (FIG. 7) to its safety position (FIG. 8) in which said abutment 41 is hooks on the abutment 42, thus stopping the displacement and / or the deformation of the crossbar 20 and ensuring the maintenance of the child seat to the seat 1, even in case of impact before violent.

Of course, the invention is not limited to the embodiments described above and provided solely by way of example. It encompasses various modifications, alternative forms and other variants that may be considered by those skilled in the art in the context of the present invention and in particular any combination of the different modes of operation described above, which can be taken separately or in combination. 14

Claims (2)

REVENDICATIONS1. Vehicle seat comprising at least: - a backrest (2) defining a front face (2a) adapted to serve as a support for a user, at least one base (8) carrying said backrest (2) and intended to be fixed to a vehicle floor (P), - a fixing crossbar (20), extending substantially in a transverse direction (Y), - at least one support plate (23) fixed to said fixing crossbar, said support plate ( 23) being adapted to secure said mounting beam to the floor (P) of the vehicle, characterized in that said seat further comprises at least one force recovery system (40) including at least one stop (41) and at least a abutment (42), integral respectively with the crossbar (20) and said at least one base (8), and in that said abutment (41) and said abutment (42) are arranged to bear one of against the other when the attachment beam (20) is displaced and / or formation under the effect of a force (F) forwardly exerted on said crosspiece (20), thereby limiting said displacement and / or said deformation. 2. Seat according to claim 1, further comprising at least one anchor (30) for a child seat, integral with the crossbar (20) and adapted to attach a child seat to the seat, the crossbar (20) undergoing displacement and / or deformation when forward force (F) is exerted on said at least one child seat anchorage (30). Seat according to Claim 1 or Claim 2, in which the fastening crosspiece (20) extends between first and second ends (21, 22), the abutment (41) being connected to an intermediate portion (27). 5 of the fastening crossbar (20) between the first and second ends (21, 22) of said crossbar (20), and wherein the backrest (2) is carried by first and second lateral legs (8). and at least one intermediate leg (8) located between the first and second lateral legs, said first and second lateral legs and said intermediate leg being adapted to be fixed to said vehicle floor (P), the abutment (42) being integral with said intermediate leg (8). 4. Seat according to any one of the preceding claims, wherein the stop (41) is adapted to catch on the abutment (42) when said stop and said abutment abut against each other 20 under the effect of said forward force (F) exerted on said attachment beam (20). Seat according to claim 4, wherein the abutment (41) has a U-shaped section comprising a web (44) extending substantially in a vertical plane towards the front of the fixing web (20) and two wings. side members (45, 46) secured to the crossmember (20), the abutment (42) having at least one downwardly projecting spout (51) and the abutment web (44) being arranged to engage hook under the spout (51) under the effect of said effort (F) forwards exerted on said crossbar (20). 16. Seat according to claim 5, wherein the lateral wings (45,46) of the abutment (41) have cutouts open towards the rear and downwards which are engaged substantially without play on the crossbar (20). , said lateral wings being welded to said fixing crossbar. 7. Seat according to any one of claims 5 and 6, wherein the abutment (42) comprises at least 10 a lug (50) projecting rearwardly relative to the base (8) and comprising said spout (51). . The seat of claim 7, wherein said tab (50) is formed of sheet metal, integral with the leg (8). 9. Seat according to claim 7 or claim 8, wherein the backrest (2) comprises first and second parts (4a, 4b) pivotally mounted independently of one another along an axis of rotation (Y1). parallel to the transverse direction (Y), said seat having first and second lateral legs (8) and first and second intermediate legs (8) located between the first and second lateral legs, said first portion (4a) of the backrest being carried by the first lateral leg and the first intermediate leg, said second leg portion (4b) being carried by the second lateral leg and the second intermediate leg, said first and second lateral legs and intermediate legs being adapted to be fixed to the floor (P) of the vehicle, and the force-recovery system (40) comprises two abutments (42) integral respectively with the p first and second intermediate legs (8), the web (44) of the stop being arranged to hook under the nozzles (51) of the tabs (50) of the abutments under the effect of said effort (F) to the before exerted said fixing crossbar (20). Vehicle seat according to one of the preceding claims, further comprising a seat (3). 11. Vehicle comprising a floor (P) and a seat (1) according to any one of the preceding claims, wherein said at least one base (8) is integral with the floor (P) of the vehicle. 15 18