FR2793455A1 - Vehicle seat, has pocket integrally formed with single piece shell forming rear face of seat back - Google Patents

Abstract

A seat has a pocket on the rear face of the seat back. The pocket is integral with a fabric covered single piece shell of the seat back. The pocket has an external surface partly formed by a rigid part of the shell and an internal surface formed by the fabric An Independent claim is included for manufacturing the shell as above that has two separate rigid thermoplastic parts on the fabric and fastened together by elastic parts.

Description

The invention relates to a seat for a motor vehicle comprising

  both a seat pad on the back side of his backrest and the process

  manufacturing the shell constituting the rear face of the backrest.

  The seats of motor vehicles offered by manufacturers include, more and more frequently, seats, in particular front seats, the back of which comprises a rear face constituted by a

  shell, usually made of plastic, covered with fabric on the outside.

  This gives a better appearance of the seat inside the passenger compartment of the motor vehicle. The seat can thus be fully matched to the style and

the interior decoration.

  Motor vehicle front seats and seats

  rear in the case of people carriers can also include, in part

  culier in the case of high-end vehicles, fabric pockets called seat pouches, attached to the back of their backrest, which are

  accessible to rear passengers of the motor vehicle and who

  wear an elastic closure at the top of the pocket.

  Such aumonières must be attached and fixed against the rear part of the seat, at the end of manufacture, which increases the cost of labor and therefore the cost price of the seats. In addition, it can be difficult to adapt the light box to the rear part of the seat, which is made of a fabric-covered shell, in such a way that the rear of the seat has good

  aesthetic presentation. Finally, saddles made completely

  fabric can be of unsatisfactory use as regards their ease of opening and the maintenance and protection of objects deposited in

The chaplain.

  The object of the invention is therefore to propose a seat for a motor vehicle comprising a backrest, the rear face of which is constituted by a shell furnished externally with fabric and comprises a seat pad, the seat pad being perfectly aesthetically integrated into the seat. and

  can be used more easily by vehicle passengers and manufactured

  simple and inexpensive.

  To this end, the seat pad according to the invention is integrated into the shell of the backrest made in one piece and has an external wall constituted by a first rigid part of the shell and an internal wall.

  constituted by fabric of filling of the hull.

  The invention also relates to a method of manufacturing the shell in a single piece constituting the rear face of the back of a seat according to the invention, in which is fixed, on a first face of a strip of upholstery fabric and on a first part of the tape, a first

  plastic part, to form with the strip of upholstery fabric

  wise, the first rigid part of the back shell and, on a second side of the strip of upholstery fabric, a second piece of material

  plastic on a second part of the strip of separate

  ree of the first part of the strip by an intermediate part of the strip of filling fabric, to constitute a second rigid part of

  the shell, the first rigid part is folded down, by folding the intermediate part

  diary of the strip of filling fabric, in the direction of the second rigid part of the shell and the first rigid part of the shell is connected, by elastic means, to the second rigid part, in order to produce

  the lightbox integrated into the hull.

  In order to clearly understand the invention, we will describe, by way of example, with reference to the attached figures, several modes of

  realization of a seat according to the invention.

  Figure 1 is a perspective view of a seat according to the invention

  and an enlarged detail of the rear part of the seat.

  Figure 2 is a sectional view through a vertical plane of part of the

  seat back shown in Figure 1.

  Figure 3 is a sectional view of the seat shell in a single

  piece before folding to make the seat light.

  Figure 4 is a perspective view of a backrest of a vehicle seat

  automobile vehicle according to the invention, and according to an alternative embodiment.

  Figures 5 and 6 are sectional views of a mold for overmolding manufacturing, the shell of the rear part of the back of a seat of

  motor vehicle according to the invention, during two phases of manufacture

cation.

  Figures 7 and 8 are sectional views of a manufacturing device

  tion by thermo-stamping a shell constituting the rear part of a vehicle seat backrest according to the invention, during two phases of

the making.

  As can be seen in FIG. 1, the seat of a motor vehicle according to the invention, generally designated by the reference 1, comprises

  a seat 2 and a backrest 3 mounted articulated on the seat 2.

  Seat 1, which is preferably a front seat of a motor vehicle

  mobile, includes a backrest 3, the rear face 4 of which is produced under the

  shape of a shell integrating a alms 5 in its lower part.

  As can be seen in FIG. 2, the seat back 3 has a flexible padding 6, for example made of foam, which is covered on its front face and on its upper part by a fabric covering 7 called a cover. The rear face 4 of the seat is constituted by a shell 8 of plastic material covered by a lining fabric 9 adhering perfectly to the

plastic shell 8.

  According to the invention, a seat pad 5 is integrated into the shell 8 of which it constitutes the lower part. The wing 5 has a rigid front wall 5a constituted by a first rigid part 8a of the shell 8 (see FIG. 3), folded down towards a second rigid part 8c of the shell, by folding an intermediate part 8b constituted by the fabric packing 9

  shell not covered with plastic.

  The filling fabric part 8b constitutes, after folding and flap-

  ment of part 8a, the inner wall 5b of the alms 5.

  The rigid outer wall 5a of the pouch is connected, on each lateral side of the shell 8 of the seat back 3, by an elastic retaining assembly 10, to the upper part 8c of the shell 8, as shown in

Figure 1.

  Each of the elastic lateral retaining assemblies of the external wall 5a of the pouch 5 comprises a first fixing hook 10a

  integral with a lateral end part of the upper part 8c of the co-

  that 8, a second hook 10'a secured to a lateral end portion of the external wall 5a of the pouch 5 and an elastic strap 1 Ob engaged on

the hooks 1 Oa and 10 O'a.

  The opening of the pouch is carried out by pulling backwards on the external face 5a by deforming the straps 10b of the two elastic holding devices. When the front wall 5a is released, it returns to the

  automatically in the closed position, its upper edge coming to rest

  cer below the lower edge of the fixed upper part 8c of the shell

8 of the seat back.

  In Figure 3, there is shown the shell 8 constituting the rear face 4 of the seat back, in its initial configuration, at the end of the manufacture, before realization of the bag and mounting on the rear part of the back

  of a motor vehicle seat.

  The shell 8 constitutes a single piece, the first rigid part 8a and the second rigid part 8c, each consisting of a part covered with a plastic filling fabric, are separated by a part 8b

  lining fabric 9 of the shell not covered with plastic.

  The plastic part of the first rigid part 8a of the shell intended to constitute the external face 5a of the pouch 5 is placed side by side and fixed on a first face of the lining fabric 9, while the plastic part of the second part 8c which is the upper part of

  the shell is attached and fixed to the second face of the lining fabric 9.

  Thus, when the first part 8a is folded over the section 8b of lining fabric 9, in the direction of the first part 8c, the external face 5a of the pouch 5 thus formed is a wall coated externally with the fabric 9 also covering the upper part 8c of the hull 8. The rear face

  4 of the seat thus has a uniform appearance.

  In Figure 4, there is shown an alternative embodiment of the vehicle seat 1, the corresponding elements in Figures 1 and 2 on the one hand

  and 4 on the other hand having the same references.

  The only difference between the seat shown in Figures 1 and 2 and the seat shown in Figure 4 is that the wing 5, in the case of the

  variant embodiment shown in FIG. 4, has a face ex-

  dull 5a which is held substantially in the plane of the upper part 8c of the shell 8, by an elastic band, for example a band of elastic fabric 10 'resting on the external face of the external wall 5a of the pouch, according to its entire length in the transverse direction of the

  seat and fixed at each of its ends on lateral parts of the back-

  sier 3 of the seat. Of course, the device according to the second alternative embodiment has the same aesthetic and practical advantages as the mode of

  embodiment shown in Figures 1 and 2.

  We will now describe, with reference to Figures 5 and 6 on the one hand and 7 and 8 on the other hand, a method of manufacturing a shell 8 of a seat

  according to the invention, by overmolding and by thermo-stamping, respectively

  vement. FIGS. 5 and 6 show the fixed part 11a and the mobile part 1b of a mold 11 for molding a shell intended to constitute the

  rear face of the backrest of a motor vehicle seat.

  In FIG. 5, the mold 11 is shown in a phase preceding the injection molding of plastic material in an injection cavity of the

  mold. The mold 11 is open, the movable part 1 1b being spaced from the

  fixed tie 11a on which is mounted an injection device 12, the injection head of which is introduced into an opening passing through the fixed part 1a of the mold. The injection device 12 can be constituted for example by a

  dosing screw ensuring the injection into the mold of a metered amount of ma-

  plastic hot liquid under pressure.

  In the initial phase of the hull manufacturing, we have, in

  the part of the mold 1 b, along a surface of the movable part 1 b delimited

  both the mold cavity, a piece of filling fabric 9.

  The mold is then closed by bringing the movable part 11b and the fixed part 11a together, and injecting into the cavity 13 of the mold, delimited

  between the mold parts 11a and 11b, a plastic material 14. The over-

  molding the plastic material 14 on the lining fabric 9 makes it possible to ensure the adhesion of the plastic material 14 and the fabric 9 and to produce a part having the shape of one of the rigid parts 8a or 8c of a

  shell 8 as shown in FIG. 3.

  The second rigid part of the shell 8 can be produced in a

  second molding operation, on part of the strip of garment fabric

  weaving 9 separated from the part which has been covered with plastic in a first molding step, by a section of lining fabric 9 intended to constitute the intermediate part 8b of the shell 8 which is not covered

plastic green.

  The second part of the lining fabric intended to be covered with plastic material to constitute the second rigid part of the shell 8 is placed in the mold, so that the plastic material is joined and fixed on the lining fabric on a face opposite to the side on which the plastic 14 of the first part is attached and fixed

rigid shell 8.

  Of course, the two molding operations can be carried out if-

  simultaneously provided that there is a sufficient injection press

powerful.

  At the end of the molding operation, a shell 8 is obtained in its

  configuration as shown in Figure 3.

  The plastic parts of the first part 8a and of the se-

  conde part 8c of the shell 8 have a flat part intended to cons-

  substitute the rear face 4 of the seat and the raised edges on their lateral sides.

  The lower and upper edges of the plastic parts of the

  parts 8a and 8c can be rounded in shape.

  When the shell 8 is mounted on the rear face of the back-

  sier of the seat of a motor vehicle, the fabric of the part 8b is folded back, so as to place the first part 8a of the shell under the second part 8c. Maintaining the part 8a of the shell 8 constituting the outer wall 5a of the pouch, in its folded position, using means

elastic bands 10 or 10 '.

  In FIG. 7 and in FIG. 8, there is shown a device for manufacturing

  cation of a shell constituting the rear face of the back of a vehicle seat

  automotive, by thermo-stamping, of two plates based on ma-

  plastic in contact with a strip of fabric covering the co-

than to achieve.

  In Figures 7 and 8, there is shown the thermo-device

  stamping generally designated by the reference 15. The thermo-stamping device 15 comprises an upper tool 15a or punch and a lower tool 15b, or die, as well as a frame 16 for fixing and maintaining the tensioned state d a strip of filling fabric 9 in an intermediate arrangement between the punch 15a and the matrix 15b. The punch 15a has a projecting part on its lower face intended to be housed in a hollow part of the matrix 15b, to ensure the guiding of the tool during the forming of the plastic plates in contact with the fabric 9,

as shown in figure 8.

  The plastic plates are preferably made up of

  a thermo-plastic material reinforced by fibers.

  For example, one can use plates consisting of 50% by volume of polypropylene and 50% by volume of a filler constituted by wood fibers for reinforcing the plastic. The plates are heated to a temperature sufficient to obtain the softening of the

  thermoplastic material, a first plate 17a in the softened state being

  placed on a part of the fabric 9 stretched over the frame 16, between a first

  working part of the first tool 15a and a first working part of the se-

  cond tool 15b, intended to form between them, by compression, the first

  part 8a of the shell 8, as it can be seen in FIG. 7.

  A second plate 17b is deposited in the softened state over a second

  working part of the second tool 15b, facing part of the fabric 9 ten-

  of the frame 16 and a second working part of the first tool 15a.

  As can be seen in FIG. 8, the plates 17a and 17b made of softened thermoplastic material are then compressed, in contact with two parts of the strip of fabric 9 separated by an intermediate part 8b, by bringing together and engaging with pressure. one over the other

two tools 15a and 15b.

  Is carried out simultaneously, between the two working parts of tools a and 15b, the shaping by thermo-stamping of the plates 17a and 17b of plastic material and the fixing by adhesion of the plates 17a and

17b on the fabric strip 9.

  Due to the initial arrangement of the plate 17a facing the working part of the tool 15a and of the plate 17b on a working surface of the tool 15b between which the fabric strip 9 is stretched. , we realize the

  shell 8 in a single thermo-stamping operation. The shell 8 pre-

  feels a first part 8a consisting of a plastic part covered by the lining fabric 9 whose shape corresponds to the shape

  of the outer wall 5a of a seat pad according to the invention and a section

  part 8c comprising a plastic part coated with the lining fabric 9 having the shape of the upper part of the shell 8 of a

  motor vehicle seat back 3, parts 8a and 8c being separated

  rees by a section 8b of the strip of fabric 9 not associated with a layer of

plastic material.

  The part obtained by thermo-stamping is therefore analogous to part 8 shown in FIG. 3 and can be shaped by folding

  to constitute the shell 8 of the rear face of a vehicle backrest

  mobile according to the invention incorporating a seat pad.

  In the case of the process for producing the shell 8 by overmolding, the tensioning and gluing of the fabric on the plastic material are carried out inside the mold cavity, at the time of the injection of the material.

  plastic under pressure in the cavity.

  In the case of making the shell by thermo-stamping, the tensioning and gluing of the lining fabric on the plastic end parts of the shell are carried out at the time of

  shaping by plastic stamping of the plastic plates.

  In either case, a single-piece shell is obtained comprising a first rigid end part in the form of a plastic part covered with fabric which is intended to constitute the outer face 5a of the seat pouch and a second end portion 8c

  rigid in the form of a piece of plastic covered with fabric, intended

  born to constitute the fixed upper part of the shell of the rear face of the

seat 3 according to the invention.

  The construction of the shell constituting the rear face of the backrest of the

  seat and incorporating a seat pad 9 is therefore particularly sim-

  quick and quick and can be obtained by easily automated operations

  wheat. It is however necessary to carry out a complementary operation of fixing of the external wall of the seat pad, by means of

  an elastic holding element.

  The seat according to the invention has a backrest, the rear face of which incorporates a seat pad has a very good aesthetic appearance

  which can be easily harmonized with the interior decoration of the vehicle

car cule.

  The rear face of the seat back, in the form of a shell incorporating a seat wing, can be produced so

  very simple and very fast on an automatic production line.

  Finally, the opening of the seat light, which has a rigid outer wall, can be carried out in a simple manner with an opening

  identical to the chaplain along its entire length in the transverse direction

  side of the seat, to place any object. The rigid wall also makes it possible to maintain and protect an object introduced into the pocket

seat.

  The invention is not strictly limited to the embodiment which has

been described.

  This is how the hull and the wing can have different shapes.

  of those which have been described and represented.

  The method of elastic fixing of the external wall of the seat pad on the remaining part of the shell can be carried out by means different from those described above, these means being arranged on the lateral sides or at the central part of the , or according to the whole

  length of the pouch, in the transverse direction of the seat.

  The shell can be made of any plastic material by a molding process or a forming process adapted to the nature of the material.

  plastic and the shape to be given to the rigid parts of the shell.

  The invention applies to seats for motor vehicles of

  all types, for example front seats for vehicles of the classic type

  that or to the seats of a minivan vehicle.

Claims (9)

  1.- Seat for a motor vehicle comprising a backrest (3), the rear face (4) of which is constituted by a shell (8) externally lined with fabric (9) and comprises a seat pad (5), characterized by the fact that the seat pad (5) is integrated into the shell (8) made in one piece and has an outer wall (5a) formed by a first rigid part (8a) of the shell (8) and an inner wall formed by fabric of lining (9) of the shell (8).   2.- Seat according to claim 1, characterized in that   The pocket (5) further comprises at least one means (9, 10) of elastic connection   tick between the outer wall (5a) of the pouch (5) and a second part   rigid (8c) of the shell (8) of the rear face (4) of the backrest (3).   3.- Seat according to claim 2, characterized in that it comprises   carries two elastic connection means (9) between the external wall (Sa) of the chaplain (5) and the second rigid part of the shell (8) of the rear face (4) of the seat (3) each constituted by a first and second fastening hooks (10a, 10'a) integral with the external wall (5a) of the pouch (5) and the second rigid part of the shell (8) of the rear face (4) of the seat (3), respectively, and an elastic strap (10b) engaged on the first and second hooks (10a, 10'a) arranged on two lateral end parts   of the shell (8) of the seat back (3).   4.- Seat according to claim 2, characterized in that it comprises   carries a means of elastic connection of the external wall (5a) of the pouch   (5) constituted by a strip of elastic material (10) fixed at its ends   tees on two lateral parts of the seat back (3) and applied along its entire length in the transverse direction to the external wall (Sa) of purse (5).   5.- Process for manufacturing the shell (8) in a single piece   killing the rear face (4) of the backrest (3) of a motor vehicle seat following   before any one of claims 1 to 4, characterized in that   fixes, on a first face of a strip of filling fabric (9), and on a first part of the strip of filling fabric (9), a first   plastic part, to form with the strip of upholstery fabric   sage (9), the first rigid part (8a) of the shell (8) of the backrest (3) and, on a second face of the strip of upholstery fabric (9), a second plastic part on a second part of the fabric strip of   lining (9) separated from the first part of the strip by a part   intermediate (8b) of the strip of filling fabric (9), to constitute a   second rigid part (8c) of the shell (8), that the first part folded down   gide (8a) by folding the intermediate part (8b) of the strip of filling fabric, in the direction of the second rigid part (8c) of the shell (8), and which is connected by means of elastic means (9, 10, 10 ') the first   rigid part (8a) to the second rigid part (8c) of the shell (8) for   kill a pouch (5) integrated into the shell (8) whose outer wall is   constituted by the first rigid part (8a) of the shell (8) coated externally   lining fabric (9) and the internal wall of which is constituted by   the intermediate section (8b) of the strip of filling fabric (9).   6.- Method according to claim 5, characterized in that at least part of a strip of lining fabric (9) is placed against the delimiting surface of a cavity of a movable part (l11b) d '' a plastic injection molding mold, of at least one rigid part of   the shell (8) of the backrest (3) of the seat (1), which the mold is closed by bringing together   the movable part (1b) of a fixed part (11a), a plastic material (14) is injected in the liquid state under pressure into the mold cavity in contact with the lining fabric (9) , that we carry out the molding operation   in contact with two parts of the strip of filling fabric (9) separated   rees by an intermediate section (8b), simultaneously or successively, so as to obtain by overmolding the plastic material in contact with   a first and with a second face of the fabric strip (9), respectively   The first rigid part (8a) and the second rigid part (8c) of the   shell (8) of the rear face (4) of the seat back (3) (1).   7.- Manufacturing process according to claim 5, characterized by   the fact that we fix and maintain between a first thermo tool   stamping (15a) and a second thermo-stamping tool (15b), a strip of filling fabric (9) in the flat and stretched state,   - placed on a first side of the strip of upholstery fabric   sage (9), facing a first working part of the first tool (15a)   thermo-stamping, a plate (17a) containing at least one   thermoplastic material heated to a temperature ensuring softening   ment of the thermoplastic material, - placing a second plate (17b) containing at least one thermoplastic material, heated to a temperature such that the plastic material is in the softened state, on a second working part of the second   tool (15b) opposite a second part of the strip of upholstery fabric   sage (9) separated from the first part of the strip of filling fabric (9) on which the first plate (17a) has been deposited in the softened state, by an intermediate part (8b) of the strip of filling fabric , and that the first plate (17a) and the second plate (17b) are stamped between the first tool (15a) and the second tool (15b) of   thermo-stamping, in contact with the first and with the second fac-   these, respectively, of the strip of covering fabric (9), to obtain the first rigid part (8a) and the second rigid part (8c) of the shell (8) of   the rear face (4) of the seat back (3) (1) separated by the intermediate part   diary (8b) of upholstery fabric (9).   8.- Manufacturing process according to claim 7, characterized by   the fact that the first plate (17a) and the second plate (17b) are made up   killed by a thermoplastic such as reinforced polypropylene   by fibers such as wood fibers.   9.- Method according to claim 8, characterized in that each   each of the plates comprises, by volume, 50% of thermoplastic material such as polypropylene and 50% of reinforcing fibers such as wood fibers.