FR2783210A1 - Seat for vehicle, comprises high strength lateral member and positional stop in upper section of seat back - Google Patents

Abstract

The seat back (5) has an upper section (6) that is mounted so as to pivot on a lower section (7). It pivots between an upright position and a folded position using a fastening mechanism (23). The fastening mechanism is only located on the side of the seat back that carries the upper seat belt fixing (14). The frame of this side of the seat also carries, in its upper section, a high strength lateral member (13). The upper section carries a positional stop (26) that prevents it from rocking backward when it is in the raised position.

Description

Vehicle seat.

  The present invention relates to vehicle seats. More particularly, the invention relates to a vehicle seat comprising a seat and a back which

  itself comprises at least one pivotally mounted upper part

  aunt around a first transverse horizontal axis on a support normally secured to the seat, this upper part of the backrest being connected to said support by means of a first articulation adapted to allow movement of said upper part of the backrest between a on the one hand, a raised position of use allowing a user to sit on the seat, and on the other hand, a folded forward position where the upper part of the backrest extends substantially parallel to the seat, the first articulation being further adapted to lock the upper part of the backrest at least in

  its raised position and to release the pivoting of the

  said upper part of the backrest by manual actuation of an unlocking member, the upper part of the backrest comprising a frame which comprises first and second rigid lateral uprights arranged on either side of the backrest, and the seat further comprising a belt security which has an upper fixing point connected to said first lateral upright, this first lateral upright being in the form of a reinforced beam having a

  mechanical resistance greater than the second lateral upright

  ral. In known seats of this type, for example the

  seat disclosed in document FR-A-2 735 730, the first

  articulation includes two mechanisms of ver-

  rusting arranged respectively on the first and second sides of the upper part of the backrest and each adapted to lock said upper part at least in its raised position, these two locking mechanisms being connected to each other by a rigid conjugation bar .

  These arrangements have the disadvantage of increasing

  ment the weight, complexity and cost of the seat, due to the presence of two locking mechanisms and

of the conjugation bar.

  In addition, the presence of this conjugation bar

  poses problems of congestion inside the back-

  sier, already largely congested by its rigid frame.

  Finally, it may be that, despite the presence of the link bar, the locking mechanisms are not both found in the locked position after unlocking the upper part of the backrest: such a fault can occur for example if the upper part of

  backrest is slightly skewed due to an abnormal effort

  badly exercised on it. In this case, if it is the locking mechanism located on the first side of the upper part of the backrest (side of the upper fixing point of

  seat belt) which is not properly tightened

  rusty, it is likely that the other mechanism

  rusting gives way if the vehicle is subjected to a violent impact, no-

  a shock tending to throw the passenger towards

  the front: the passenger in the seat then runs an im-

bearing injury.

  The object of the present invention is in particular to pal-

link these drawbacks.

  To this end, according to the invention, a seat of the kind in question is essentially characterized in that the

  first articulation includes a single mechanism of ver-

  rusting, which connects the support to the first lateral upright of the upper part of the backrest, the second lateral upright being connected to the support by a simple pivoting assembly, and

  in that the framework of the upper part of the backrest

  carries, at least at the level of the second lateral upright, a first stop which cooperates with the support to prevent said upper part from tilting backwards when it

is in the raised position.

  Thanks to these provisions, when the vehicle in which the seat is installed suffers a shock which tends to

  throw the occupant of the seat forward, the upper strand

  The laughing seat belt essentially stresses the first lateral upright of the upper part of the backrest, which resists suitably due to its high mechanical strength. On the other hand, when the vehicle is subjected to a shock tending to throw the occupant of the seat backwards, the two lateral uprights of the upper part of the backrest are stressed, but:

  - on the one hand, the first lateral upright is re-

  held as before at least by the mechanism of ver-

  rusting, - and, on the other hand, the absence of a locking mechanism on the second lateral upright of said upper part is not a problem, since the pivoting of

  this upper part towards the rear is prevented by the pre-

  first stop cooperating with the support of said upper part. Thus, the seat according to the invention ensures the safety of its user, while avoiding using

  two locking mechanisms and a link bar

  its at the level of the first articulation.

  In preferred embodiments of the invention

  In addition, one and / or the other of the following provisions may optionally be used:

  - the framework of the upper part of the backrest

  door, at the second lateral upright, a second

  stop which is separate from the first stop and which coo-

  father also with support to prevent said party

  high to tip back when in position

  tion raised; - the support comprises a rigid cross member which is secured to a rigid vertical plate at the level of the second lateral upright of the framework of the upper part

  of the backrest, said framework comprising a lower cross

  rigid rigid which is secured, at the second lateral upright, with a rigid vertical plate which forms the second stop and which cooperates with said rigid plate integral with the cross member of the support; the first stop cooperates with the crosspiece of the

  support to prevent the upper part of the backrest from

  go backwards when said upper part is in position

sition raised;

  - the framework of the upper part of the backrest

  further carries, at the first lateral upright, a third stop which cooperates with the support to prevent said upper part from tilting backwards when it is in the raised position;

  - the file includes a lower part which

  titue said support and which is pivotally mounted on the

  located around a second transverse horizontal axis by means of at least one articulation mechanism adapted to selectively lock the lower part of the backrest in a plurality of angular positions; - The locking mechanism comprises a lock with several teeth which is pivotally mounted between on the one hand, a locked position o its teeth are engaged with complementary notches formed in a member of

  rigid reception, and on the other hand, an open position

  rusted o the bolt does not cooperate with said receiving member, the bolt and the receiving member being mounted

  one on the support and the other on the first upright la-

  the upper part of the backrest, the lock having a number n of teeth and the receiving member comprising, on the one hand, n notches which receive the n teeth of the lock

  when the upper part of the backrest is in the raised position

  on the other hand, a single notch which receives a

  only of the teeth of the lock when the upper part of the back-

  sier is in the folded position; the locking mechanism further comprises a cam which cooperates with the lock and which is resiliently biased towards a locking position o said cam places the lock in its locked position, this cam being movable, by means of the unlocking member, towards an unlocked position where said cam allows the lock to be placed in the unlocked position.

  Other characteristics and advantages of the invention

  tion will appear during the following description

  of one of its embodiments, given by way of example

  non-limiting magpie, with reference to the accompanying drawings.

  In the drawings: - Figures 1 and 2 are perspective views of the two sides of a seat according to an embodiment

  of the invention, with the upper part of its back in po-

  raised position, - Figure 3 is a side view of the seat of

  Figures 1 and 2, with the upper part of its flap folder

  kills forward in a tablet, - and Figure 4 is a detail view showing the locking mechanism of the upper part of the backrest

of the seat of FIGS. 1 and 2.

  In the different figures, the same references

  denote identical or similar elements.

  Figures 1 and 2 show a vehicle seat

  cule automobile 1, and in particular a removable seat for

modular cabin.

  This seat has a seat 2 whose frame ri-

  gide can be secured to the vehicle floor by

feet 3.

  The rigid frame of the seat includes in particular two vertical lateral flanges 4 which carry the seat back. The backrest 5, meanwhile, includes an upper part 6 which is pivotally mounted on a lower part 7

  around a first transverse horizontal axis Y1, the par-

  low tie 7 being itself pivotally mounted on the seat

  around a second transverse horizontal axis Y2.

  We can thus: - on the one hand, adjust the inclination of the backrest 5

  to ensure user comfort, by pivoting

  ter the lower part 7 around the axis Y2, - and on the other hand, by pivoting the upper part 6 around the axis Y1, place the file either in its substantially vertical position of use (Figures 1

  and 2), either in its substantially horizontal folded position

  zontale (figure 3), where the back of the backrest can be used as

Tablet.

  As shown in Figures 1 and 2, the lower part 7 of the backrest comprises two rigid flanges 8 which are connected to each other by at least one transverse spacer 9 and which are mounted respectively on the

  seat flanges 4 by means of two articulation mechanisms

  culation 10 arranged on both sides of the seat.

  These two articulation mechanisms are controlled by the same handle 11 (FIG. 2) and synchronized with the

  by means of a rigid horizontal link bar 12

  versal. Preferably, the articulation mechanisms 10

  are gear mechanisms, in particular hy-

  pocycloidal monotrain or with satellite.

  An example of such an articulation mechanism is given for example in the document EP-A-0 505 229. Optionally, the articulation mechanisms 10 could be constituted by simple multi-position locking mechanisms, generally comprising a

  circular toothing which cooperates with toothed grains

  mandated by a cam. An example of such a mechanism of arti-

  culation is given in particular in document EP-A-0 502 774. Furthermore, the upper part 6 of the backrest comprises a rigid frame formed by: - a first vertical lateral upright 13, which is disposed on one side of the part high 6 and which is in the form of a beam of great mechanical resistance, the first lateral upright 13 bearing towards its

  upper end, the retractor 14 of the seat belt

  curity 15 of the seat (or more generally, the upper attachment point of this belt, the two lower anchor points 16,17 of the seat belt

  being fixed for example on the two flanges 4 of the as-

  seat), - a second lateral upright 18 which extends over

  the second side of the upper part of the backrest and which pre-

  feels a mechanical resistance lower than the resistance of the first lateral upright 13, this second lateral upright 18 advantageously being in the form of a tube

  which extends at right angles to the first upright la-

  13 at its upper end, so as to form a horizontal upper cross member 19 fixed to the upper end of said first lateral upright, - a lower horizontal cross member 20, fixed to the lower ends of the first and second lateral uprights, and a spacer 21 which extends at an angle and

  which is fixed on the one hand, at the upper end of the first

  mier lateral upright 13, and on the other hand, at the end

  lower of the second lateral upright 18.

  The lower end of the second lateral upright

  18 is connected to one of the flanges 8 of the lower part

  lower 7 of the backrest by means of a simple pivot

  22 (Figure 1), while the lower end of the first

  mier lateral upright 13 can be locked on the flas-

  that 8 corresponding by means of a ver-

  rust 23 can be operated manually by means

  a handle 24 or the like (FIG. 2).

  In addition, as can be seen in particular in FIG. 1, when the upper part 6 of the backrest is in

  raised position, the first and second side uprights

  13,18 sides of this upper part have stops

  , 26,26a which cooperate respectively with

  27,9,28 tees belonging to the lower part 7 of the back-

  sier, to prevent any tilting of said part

  back 6 of the backrest.

In the example considered here:

  - the stop 25 is constituted by a lower part

  of the resistant beam forming the lateral upright 13 of the upper part of the backrest while the buttress

  27 is constituted by an upper part of the flange la-

  number 8 corresponding from the lower part of the file,

  the stop 26 is constituted by a lateral flange

  metal ral integral with the upright 18, the cross-member 20 and the spacer 21, this stop 26 cooperating with the cross-member 9 of the lower part of the backrest, forming an abutment, - and the stop 26a is constituted by a vertical metal plate which is welded to the end of the

  cross 20, the butt 28 which cooperates with this bu-

  tee 26a also being constituted by a metal plate

  that vertical which is welded to the end of the cross-member 9. Optionally, the abutment and butted zones

  25.27 located on the side of the first lateral upright for-

  if necessary be deleted.

  The locking mechanism 23 can be produced by any known means allowing the upper part 6 of the backrest to be locked at least in the raised position, and in the case

  also in the folded forward position.

  This mechanism 23 can for example be that represented

  felt in FIG. 4 which comprises: - a rigid metal plate 29 (or receiving member) parallel to the flange 8 and secured to the first lateral upright 13 of the upper part of the backrest

  by means of a pin 30 or the like which

  puts said lateral upright 13 to pivot on the flange 8

  around the first axis Y1, the plate 29 having a

  riphery in an arc of circle in which are formed three upper notches 31 and a lower notch 32, l1 - a lock 33 pivotally mounted on the flange 8

  between a locked position and an unlocked position

  rusty, this lock comprising three teeth 34 which, when the upper part of the backrest is in the raised position, are adapted to engage in the upper notches 31 of the plate 29, only the upper tooth 34 engaging in the notch 32 of the plate 29 when the upper part of the backrest is in the folded forward position, - and a cam 35 which is pivotally mounted on the flange 8 enters, on the one hand, a locking position

  or said cam places the latch 33 in its green position

  rusty, and secondly, an unlocked position

  o said cam allows the lock to be placed in its posi-

  unlocked tion o it does not cooperate with the plate 29,

  the cam 35 being biased towards its position of ver-

  rusting by a spring 36 and which can be moved into its unlocking position by means of the aforementioned handle 24.

Claims (8)

  1. Vehicle seat comprising a seat (2) and a backrest (5) which itself comprises at least one upper part (6) pivotally mounted around a first horizontal axis.   transverse zontal (Y1) on a support (7) normally so-   lidarized with the seat, this upper part of the backrest   being connected to said support by means of a first articu-   lation (22, 23) adapted to allow movement of   said upper part of the file enters on the one hand, a posi-   tion raised for use allowing a user to sit on the seat (2), and on the other hand, a folded forward position where the upper part of the backrest extends substantially parallel to the seat, the first one   articulation (22, 23) being further adapted for ver-   rust the upper part (6) of the backrest at least in its raised position and to release the pivoting of said   upper part of the backrest by manual actuation of an or-   release handle (24), the upper part of the backrest   nant a frame which comprises first and second rigid lateral uprights (13, 18) arranged on either side of the backrest, and the seat further comprising a   seat belt (15) which has a fixing point   tion higher (14) connected to said first lateral upright (13), this first lateral upright being under the   form of a reinforced beam with mechanical strength   than greater than the second lateral upright (18), characterized in that the first articulation comprises a   single locking mechanism (23), which connects the support   port (7) to the first lateral upright of the upper part of the backrest, the second lateral upright (18) being connected to the support (7) by a simple pivoting mounting (22),   and in that the framework of the upper part of the backrest   carries, at least at the level of the second lateral upright (18), a first stop (26) which cooperates with the support (7) to prevent said upper part from tilting towards   the rear when in the raised position.   2. Seat according to claim 1, wherein   the framework of the upper part of the backrest includes, at the   O10 calf of the second lateral upright (18), a second stop (26a) which is separate from the first stop (26) and which also cooperates with the support (7) to prevent said upper part from tilting backwards when it is raised position.   3. Seat according to claim 2, wherein the   support comprises a rigid crosspiece (9) which is integral   placed with a rigid vertical plate (28) at the level of the second lateral upright (18) of the frame of the upper part of the backrest, said frame comprising a rigid lower crosspiece (20) which is secured, at the level of the second lateral upright, with a rigid vertical plate   (26a) which forms the second stop and which cooperates with the-   said rigid plate (28) integral with the crosspiece (9) of the support. 4. Seat according to claim 3, wherein the   first stop (26) cooperates with the crosspiece (9) of the support   port to prevent the upper part of the backrest from tilting backwards when said upper part is in the raised position.   5. Seat according to any one of the claims   previous, in which the framework of the upper part of the backrest further comprises, at the first lateral upright (13), a third stop (25) which cooperates with the support (7) to prevent said upper part from tilting   backwards when in the raised position.   6. Seat according to any one of claims   previous, in which the backrest comprises a bottom part (7) which constitutes said support and which is mounted   pivoting on the seat (2) around a second horizontal axis   transverse zontal (Y2) by means of at least one articulation mechanism (10) adapted to selectively lock   the lower part (7) of the backrest in a plurality of positions angular tions.   7. Seat according to any one of the claims   previous, in which the locking mechanism (23) comprises a latch (33) with several teeth (34) which is pivotally mounted between on the one hand, a locked position   o its teeth are engaged with complementary notches   res (31, 32) formed in a rigid receiving member (29), and on the other hand, an unlocked position where the lock does not cooperate with said receiving member, the lock (33) and the receiving member ( 29) being mounted one on the support (7) and the other on the first lateral upright (13) of the upper part of the backrest, the latch (33)   comprising a number n of teeth (34) and the receiving member   tion (29) comprising, on the one hand, n notches (31) which   receive the n teeth of the lock when the upper part (6) of the backrest is in the raised position, and on the other hand, a   single notch (32) which receives only one of the teeth of the worm   rou when the upper part of the backrest is in the ra-   battered. 8. Seat according to claim 7, wherein the locking mechanism (23) further comprises a cam (35) which cooperates with the lock (33) and which is resiliently biased towards a locking position where said cam places the lock in its locked position, this cam being movable, by means of the unlocking member (24), towards an unlocking position o said cam   allows the latch to move to the unlocked position.