FR2945487A1 - Seat cushion for motor vehicle, has flexible bag provided with upper layer and lower layer, and insert inserted in bag, where upper layer is overmolded against reverse face by foam block - Google Patents

Abstract

The cushion (1) has a compressible elastic foam block (2) provided with a reverse face (3). A flexible bag (4) is provided with an upper layer (5) and a lower layer (6). The upper layer is overmolded against the reverse face by the foam block. An insert (7) is inserted in the bag. The upper layer is made of a porous material and nonwoven fibrous material. The insert has an anchoring lug traversing the upper layer through an orifice. The upper layer has a peripheral crown arranged to recover an edge of a cap.

Description

The invention relates to a motor vehicle seat cushion.

It is known to provide a motor vehicle seat cushion, said cushion comprising a block based on elastically compressible foam overmolding an insert, said insert being for example a means for hooking the cushion on the seat structure.

The insert may also form stiffening means of its backside, said insert being for example based on zigzag-shaped metal wire and molded by the foam close to said face.

Such stiffening means is particularly useful in the case of liftable cushions for enlarging the luggage compartment of the vehicle, to impart sufficient rigidity to said cushion. The known embodiments have various disadvantages, particularly in terms of separation of the block for recycling at the end of life of the cushion and, where appropriate, the weight of the insert.

The object of the invention is in particular to overcome these disadvantages.

For this purpose, the invention proposes a motor vehicle seat cushion, said cushion comprising: a block based on elastically compressible foam, said block comprising a backside face, at least one flexible bag provided with a upper layer and a lower layer, said upper layer being overmolded by said block against said back face, • at least one insert, said insert being inserted into said pocket. In this description, the terms of positioning in the space (upper, lower, back, place, ...) are taken in reference to the cushion disposed in the vehicle. The cushion proposed makes it possible for recycling easy separation of the insert by removing it from the pocket, the latter possibly undergoing tearing destruction. It will be seen further that the use of a porous top layer may allow to lighten the insert and therefore the cushion that is provided.

Other features and advantages of the invention will become apparent in the description which follows, with reference to the appended figures in which: FIG. 1 is a diagrammatic representation in exploded (la) and unexploded (Ib) perspective of a cushion according to a first embodiment, • Figure 2 is a schematic sectional representation of a cushion according to a second embodiment, • Figure 3 is a schematic sectional representation of a cushion 15 according to a third embodiment.

Referring to the figures, a motor vehicle seat cushion 1 is described, said cushion comprising: a block 2 based on elastically compressible foam, said block 20 comprising a back face 3, at least one flexible pouch 4 provided with an upper layer 5 and a lower layer 6, said upper layer being overmolded by said block against said back face, • at least one insert 7, said insert being inserted into said pocket, said insert being here wire base folded on itself.

The upper 5 and lower 6 layers are associated with each other, in particular by sewing or welding 19.

To ensure proper retention of the insert 7 in the pocket 4, the latter may have dimensions adjusted to those of said pocket. 3 The proposed arrangement allows a very simple removal of the insert 7 of the pocket 4 at the end of life of the cushion 1 for recycling.

In particular, it may be provided that a seam or weld associating the layers 5, 6 is of moderate strength so as to allow it to be easily torn in order to remove the insert 7.

In a manner not shown, at least one tear primer may be provided on the lower layer 6, to allow easy destruction of the pocket 4 to remove the insert 7 to recycle.

According to one embodiment, the upper layer 5 is based on porous material, the foam penetrating at least partially in its thickness, which has the effect of stiffening said layer and to allow the use of a small insert 7, having little or no stiffening function, which gives lightening to the cushion 1.

According to one embodiment, the upper layer 5 is based on fibrous material, in particular non-woven material. According to the embodiment of FIG. 3, the insert 7 comprises at least one anchoring projection 8 passing through the upper layer 5 through a first orifice 9, said projection being overmolded by the block 2.

Such an embodiment makes it possible to optimize the attachment of the insert 7. In order not to impair the ease of removal of the insert 7 from the pocket 4, the projection 8 has a small size to allow it to be pulled out of the foam when carrying out the recycling operation.

According to the embodiments shown, the insert 7 comprises an outgrowth 17 protruding through a second orifice 16 provided in the lower layer 6, said protuberance forming for example a means of attachment, in particular in rotation, of the cushion 1 to the seat structure that can be formed of the floor of the vehicle when the cushion 1 is placed on it.

As represented in FIG. 1b, the insert 7 has a locking portion 15, not covered by the lower layer 6, said part being intended to cooperate with a reciprocal means provided on the seat structure, in order to prevent a rotation unwanted cushion 1 in case of accident.

According to the embodiments shown, the foam overmoulds, at least partially, a covering cap 10 extending at least on its location face 11.

The cap 10 further extends on the side faces 18 of the cushion 1 and on the edge of the rear face 3, for example over a width of the order of 40 mm.

As visualized in FIGS. 2 and 3, the upper layer 5 comprises a peripheral crown 12 for masking which is not overmolded by the foam, the said crown being disposed in overlapping of the edge 13 of the cap 10. Such an embodiment makes it possible to simplify the manufacture of the cushion 1 - in particular to reduce the dressing time of the mold and to avoid the need for precise positioning of the cap 10 - and to ensure the masking of the foam at the interface between the cap 10 and the upper layer 5. According to the embodiment of FIG. 2, the upper layer 5 comprises at least one third orifice 14, the block 2 overmolding locally the lower layer 6 opposite said orifice, in order to partition the pocket 4, in particular in order to ensure optimal retention of the insert 7 in said pocket. A method of producing a cushion 1 comprising the following steps is now described: • making a pocket 4, • placing said pocket against the wall of a mold, • injecting into the mold a precursor mixture of elastically compressible foam, After expanding the foam, demolding the block 2 overmolding said pocket, insert an insert 7 into said pocket.

An alternative embodiment of a method for producing a cushion 1 comprising the following steps: • to make a pocket 4, • to insert an insert 7 into said pocket, • to arrange said pocket provided with said insert against the wall of a mold, • injecting into the mold a precursor mixture of elastically compressible foam, • after expansion of the foam, demolding the block 2 overmolding said pocket provided with said insert.

Claims (9)

REVENDICATIONS1. Motor vehicle seat cushion (1), said cushion comprising: a block (2) based on elastically compressible foam, said block comprising an upside-down face (3), at least one flexible bag (4) provided with an upper layer (5) and a lower layer (6), said upper layer being overmolded by said block against said back face, • at least one insert (7), said insert being inserted into said pocket. 2. Cushion according to claim 1, characterized in that the upper layer (5) is based on porous material, the foam penetrating at least partially in its thickness. 3. Cushion according to claim 2, characterized in that the upper layer (5) is based on fibrous material, especially non-woven material. 4. Cushion according to any one of claims 1 to 3, characterized in that the insert (7) comprises at least one projection (8) for anchoring through the upper layer (5) through a first orifice (9), said projection being overmolded by the block (2). 5. A cushion according to any one of claims 1 to 4, characterized in that the insert (7) comprises an outgrowth (17) protruding through a second orifice (16) provided in the lower layer (6) . Cushion according to any one of claims 1 to 5, characterized in that the insert (7) has a locking portion (15) not covered by the lower layer (6). 7. A cushion according to any one of claims 1 to 6, characterized in that the foam molds, at least partially, a cover cap (10) extending at least on its location face (11). 8. Cushion according to claim 7, characterized in that the upper layer (5) comprises a ring (12) peripheral masking not overmolded by the foam, said ring being arranged in overlap of the edge (13) of the cap (10). ). 9. Cushion according to any one of claims 1 to 8, characterized in that the upper layer (5) comprises at least a third orifice (14), the block (2) overmolding locally the lower layer (6) facing said orifice.