FR2465442A1 - IMPROVEMENTS TO SEAT RECORDS, IN PARTICULAR FOR VEHICLES - Google Patents

Abstract

IT IS ABOUT ADJUSTING THE LONGITUDINAL HORIZONTAL POSITION OF TWO INTERMEDIATE POINTS P AND P ELASTICALLY SUSPENDED FROM A SEAT BACKREST BY SPRINGS 6, AND THIS IN A WAY TO ADJUST THE LUMBAR SUPPORT PROVIDED BY THIS TABLECLOTH. A ROTARY CONTROL HANDLE 7 IS USED, JOINTLY WITH A CAM 8 EXTENDING ACCORDING TO A LOW SLOPE SPIRAL (7), WHICH COOPERATES WITH A FINGER 9 OF A JOINT LEVER HIMSELF WITH A CROSS BAR 16 THE ANGULAR MOVEMENTS OF THE BAR ARE TRANSFORMED, DIRECTLY OR THROUGH TWO SPRINGS 6, INTO THE DESIRED MOVEMENTS OF POINTS P AND P. PREFERRED APPLICATION TO VEHICLE SEATS.

Description

The invention relates to seat backs, particularly

  for vehicles, and more particularly to those of these folders, comprising at least in their lower half a sheet sustained or limited externally by a frame itself -supplied to a rigid peripheral frame. It relates more particularly still, among these folders, those which comprise means for adjusting, from the angular displacements of a control lever horizontal transverse axis, that is to say extending according to the width of the seat , the position of an intermediate point (P, P ')

  of each of the two lateral uprights of the frame in accordance

  "horizontal longitudinal", that is perpendicular

  the average surface of the water table at this point, so as to re-

  the degree of lumbar support of the person sitting on the

seat equipped with such a folder.

  In the known embodiments of such adjustment means, the number of stable positions of adjustment is limited and the locking of the mechanism in each of its set positions requires the use of a locking system with fragile notches

and expensive.

  The invention makes it possible to eliminate these drawbacks by

  possible continuous adjustment and making

  course to a latch locking system.

  For this purpose, the adjustment means of the kind considered according to the invention are essentially characterized in that they comprise an angularly integral spiral cam

  of the joystick, the slope of this spiral being suf-

  weak to ensure the irreversibility of the

  of, a lever secured to a bar extending along the entire width of the backrest and pivotally mounted on the rigid frame -2-

  this file around a fixed axis parallel to that of the

  net, lever whose end is applied against the cam,

  a first mechanism to transform the moves--

  angular amounts of the bar due to those of the joystick in the desired displacements of the point P, and a second mechanism suitable for transforming said angular displacements of the bar

in those desired from point P '.

  In preferred embodiments, one or more of the following provisions are also used: the slope of the spiral is of the order of 7 degrees,

  - each mechanism of transformation of angular displacements

  res of the bar in displacements of a point P or P'oomprend an eccentric lug integral with the bar,

  - each eccentric leg according to the preceding paragraph is directly

  applied against an amount of the box at point P or P ',

  - each eccentric leg according to the preceding paragraph

  tooth is connected to point P or P 'by a spring stretched in a substantially horizontal direction transverse between this tab and this point,

  - in a file according to the preceding paragraph, the cam is con-

  staggered by a recessed groove in a disc,

  - in a file according to the preceding paragraph, the joystick

  mande, constituted by a round handle, and the disc which is integral therewith are pivotally mounted on a shaft section itself welded to the backrest frame, - in a folder according to the preceding paragraph-the previous one, the joystick, constituted by a round handle, and the

  integral disc are pivotally mounted in a

  wise of a box, itself secured to the backbone of the back-

  in such a way that the disc has its groove

  on a front side of it, opposite the

  mité lever to cooperate with this groove.

  The invention comprises, apart from these main provisions, certain other arrangements which are preferably used at the same time and of which it will be more explicitly

question below.

  In what follows, we will describe some modes of

  preferred embodiments of the invention with reference to the drawings

  attached hereto in a manner of course not limiting.

  Figure 1 of these drawings schematically shows a - 3 -

  seat backrest equipped with a lumbar support adjustment mechanism

according to the invention.

  Figures 2 and 3 show respectively, seen from the front of the seat and seen laterally along III-III, fig.2, such a setting mechanism established according to the invention. Figures 4 and 5 respectively show, seen from the front of the seat and seen laterally, torn portions, according to the arrow V of FIG. 4, another such mechanism according to the invention.

  In each case, the file in question, preferably

  to a vehicle seat, has at least in its half

  a sheet 1 delimited externally by a semi-circular frame

  rigid 2, itself suspended from the rigid peripheral framework

3 of the file.

  Said sheet 1 may itself be elastic and for this purpose

  fet constituted by wavy springs in zigzags or broken lines, or by rubber bands, the frame 2 can then be mounted on the frame 3 with the aid of non-deformable hooks. It can also be constituted, as illustrated, by

  simple inextensible metal wires 4 stretched parallel-

  between the lateral uprights 5 of frame 2, the elas-

  ticity of the backrest being then ensured by the flexible coating

  and elastic of this sheet, especially foam, and by the

  elastic floor of its frame on the backrest frame.

  This frame preferably extends along a complete line

  closed and may consist of a metallic wire

  curved or by a sequence of slats connected together to

  using flat sections bent at right angles.

  It may in some cases be limited to two

lateral tents 5.

  The elastic suspension of said frame is advantageously

  provided by a plurality of helical coil springs

  6 stretched horizontally between the uprights 5 of this frame

  and the rigid frame 3 of the file, which itself consists of

  at least at the base of this dossier by two flanges

  vertical parallel spacers using a general profile-

tubular.

  The sheet 1 and its coating are intended to support the lumbar region and in particular the kidneys of the person

sitting on the seat.

-4-

  To adapt this support to the corpulence of this

  ring, it is appropriate to be able to adjust the "longitudinal horizontal" position, namely in a direction perpendicular to the surface of the web 1, two intermediate points P and P 'amounts 5 located similarly to the kidneys plus these points are advanced by compared to this tablecloth, more

  the lumbar support provided by said sheet is accentuated.

  Note that the above choice of points P is par-

  particularly sensible because they are located on either side of the base of the seated person's spine, so that the accentuation of lumbar

  result of no increase in the bearing pressure exerted

  on this basis, a necessary condition for comfort.

  The adjustment in question according to the invention is

  continuous way from a rotary handle 7,

  sant call to the assembly of a cam 8 in spiral, secured to this handle and a finger 9 rigidly or not rigidly attached to the points

  P and P 'and mounted so as to slide against said

  me, the slope of the spiral being low enough to ensure

the irreversibility of the mechanism.

  For steel parts, this slope is of the order

of 7 degrees.

  Two embodiments of such a mechanism are described below in greater detail, for which the movements of the finger 9 are transmitted to the points P and P 'either loosely

  via two of the springs 6, either rigidly.

  In each case, the rotary handle 7 is in the form of a knurled or corrugated cylindrical skirt button, pivotally mounted on one of the flanges of the frame 3 about a horizontal transverse axis X located substantially at the level of point P. In the first embodiment illustrated in Figures 2 and 3, the button 7 is secured to a disc 10 in which is recessed a spiral groove constituting the cam 8. A rigid lever 11 is pivotally mounted on the flange 3 around a fixed axis Y parallel to the X axis.

  A portion of this lever 11 constitutes the finger 9

  above. A spring 6 whose one end is hooked on the frame 2 at the point P. is hooked by its other end on

  a lug 12 forming part of the lever 11.

  The angular displacements of the handle-7 about the X axis result in identical angular displacements of the cam 8, and therefore by angular displacements of the finger 9 and the lever 11 around the Y axis, which have

  effect of moving in the direction "horizontal horizontal

  tudinale "the latching lug 12 of the spring 6 considered.

  Due to the semi-rigid constitution of the upright 5, this last displacement results in a similar displacement of the point P. although of smaller amplitude, for example by half, and therefore by a more or less pronounced bulge of said

amount 5 forward.

  It should be noted that the order thus ensured is irre-

  versible, in that the support of the person sitting against the folder, and therefore against the points P and P 'towards the back of this folder, can in no way cause the mechanism and its control button in the meaning tending to roll back

said points.

  In the embodiment illustrated in Figures 2 and 3, a shaft section or pivot 13 through the flange 3 and welded thereto, is used to ensure the pivoting mounting of the handle 7 and the disk 10 on the flange , this

  pivot 13 through this handle and this disk.

  To make possible the angular displacements of the

  lever It around its Y axis, it is then expected in this-

  a notch 14 clean to overlap the pivot 13.

  A flared rim 15 in the flange 3 serves to guide the former.

  free end of the lever 11 by holding it in screed.

  The mechanism that has just been described, mounted on the base of one of the two flanges 3 of the file, is partly doubled on the basis of the other flange in the sense that we find on this other base a second lever pivoted around the

  same Y-axis as lever 11 above, to which it is

  rised by a torsion-resistant bar 16 extending

  along this axis Y over the entire width of the file.

  This second lever carries, like the first, a hooking tab for a spring which connects this tab to the point P -6-

to support in an adjustable way.

  It is also guided by a punctured rim in the

  corresponding flange, but it no longer corresponds to equi-

  are worth 9 finger or notch 14 since the cam and the handle are provided on one side of the seat. The presence of the pivot 13 in the center of the disc 10 may be a disadvantage in terms of size, because the birth of the spiral is carried to a radius greater than that of said pivot, that is to say at a distance relatively large axis X. To overcome this drawback, we can remove the pivot in question, by mounting the rotary handle 7 in a bore of a boot attached to the flange 3: the disk can then present next to the finger 9 a front face

  completely cleared at its center, which makes it possible to

  the spiral very close to the X axis and, consequently, to reduce

  the outside diameter of the disc 10.

  This construction also avoids the need for

  to provide the notch 14 in the lever 11.

  In the embodiment illustrated in FIGS.

  and 5, the spiral cam 8 is constituted by the outer portion

inside a plate.

  There is still a rigid lever 11, one of which

  9 is applied against the cam 8, lever integral with a transverse bar 16 extending along an axis Y parallel to

  the X axis and pivotally mounted on the two flanges 3.

  But it is no longer via springs 6 that the angular deflections of this lever 11 or this

  16 are transmitted to the points P and P ': this transmission

  sion is ensured here directly by two tabs 17 welded on the bar 16 and bearing respectively against the

  two amounts 5 of the sheet 1, behind these amounts, at ni-

calf points P and P '.

  In this case the angular displacements of the lever 11

  due to the rotations of the handle 7 are directly transformed

  displacement of points P and P ', which makes it possible

  keep for these displacements amplitudes greater than

  those likely to be obtained with the embodiment according to Figures 2 and 3, to the detriment, it is true, of -7

244S442

  the flexibility of the support provided at said points P and Pl.

  Here again, the order is continuous and irreversible.

  It should be noted that the constitution of the spiral cams 8 by grooves, according to the embodiment of FIGS. 2 and 3, eliminates the need for special angular loading of the levers

  11 to keep them applied against these cams.

  In the embodiment of FIGS. 4 and 5, this application

  permanent cation is provided indirectly by the springs 6 themselves since the tension of these springs tends constantly

  to apply the amounts 5 of the frame of the tablecloth against the pat-

  7 of these levers 11 and therefore these against

the cams 8.

  As a result of which, and whatever the embodiment

  adopted, there is finally a file equipped with a

  adjustment mechanism for lumbar support, a mechanism

  tion, operation and benefits (in particular

  continuity and irreversibility of the order) are sufficient

with the above.

  It goes without saying, and as it follows already from the foregoing, the invention is not limited to those of its modes of application and realization which have been more

  specially envisaged; on the contrary, it embraces all

your variants.

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Claims (8)

  1. Seat file comprising, on the one hand, at least   in its lower half, a sustained   by a frame, itself - suspended from a rigid peripheral frame and secondly, means for adjusting, from the angular displacements of a transverse horizontal axis control lever, the position of an intermediate point ( P. P ') of each of the two lateral uprights of   frame in the longitudinal horizontal direction,   in that said adjusting means comprise a cam   spiral (8) angularly secured to the joystick   Mande (7), the slope of this spiral being sufficiently small to ensure the irreversibility of the control, a lever (11) integral with a bar (16) extending along the entire width of the backrest and pivotally mounted on the rigid frame (3) of this folder about a fixed axis (Y) parallel to that (X) of the lever, lever whose end (9) is applied against   the cam, a first mechanism for transforming   angular movements of the bar due to those of the joystick   the desired movements of the pointPetun second mechanism pro-   pre to transform said angular displacements of the bar in those desired from point P '.   2. Seat backrest according to claim 1, characterized   rised in that the slope of the spiral is of the order of 7 sandstone.   3. Seat backrest according to claim 1 or 2,   characterized in that each mechanism for transforming   angular placements of the bar (16) in displacements of a point P or P 'comprises an eccentric lug (12,17) integral of the bar.   4. Seat backrest according to claim 3, characterized   in that each eccentric tab <17) is directly   plied against an amount (5) of the frame (2) at point P or P '.   Seat backrest according to claim 3, characterized   in that each eccentric tab (12) is linked to the point   P or P 'by a spring (6) stretched in a sensitive direction   horizontally transverse between this leg and this point.   6. Seat backrest according to claim 5, characterized   in that the cam (7) is constituted by a groove 246S442 -9 recessed in a disk (10).   Seat file according to claim 6, characterized   in that the control lever, constituted by a round handle, and the disc which is integral therewith are pivotally mounted on a shaft section (13) itself welded on the frame (3) of the file.   8. Seat backrest according to claim 6, characterized   risé in that the joystick, constituted by a round handle, and the disc which is integral therewith are pivotally mounted in a bore of a housing, itself secured   with the backrest frame, so that the disc   feel its spiral groove on a front face of this-   next to the end of the lever intended to cooperate with this groove.