Motor vehicle seat headrest

Abstract

The invention relates to a headrest (1) for a motor vehicle seat, said headrest comprising a frame (2) having two rods (3), a block (4) of elastically compressible polyurethane foam padding overmolded to said frame, a cover (5) overmolded by said block, at least one porous absorption element (7) for absorbing gases from the polyurethane formation reaction, said element being overmolded by said block, a thickness of foam from said block interposed between said element and said cover, said absorption element being made of a flexible material having a general sleeve shape fitted onto said frame so as to be integral with it. Figure 1

Description

Title of the invention: Motor vehicle seat headrest

[0001] The invention relates to a motor vehicle seat headrest and a method for making such a headrest.

[0002] It is known to produce a motor vehicle seat headrest, said headrest comprising: • a connecting frame to the back of said seat, said frame being based on a folded metal tube, so as to present two parallel rods intended to be inserted into sleeves provided at the top of the back of said seat, • a block of elastically compressible polyurethane foam padding overmolding said frame, • a covering cap for said block, said cap being overmolded by said block, said cap being formed of a plurality of covering formats combined together, at least one of said formats being leather-based and being devoid of a porous comfort underlayer so as to be directly overmolded by said block, • at least one porous absorption element intended to absorb gases - in particular in the form of carbon dioxide - resulting from the polyurethane formation reaction, said element being overmolded by said block, a thickness of foam from said block being interposed between said element and said cap.

[0003] It should be noted here that the fact of not putting a comfort underlayer on at least one format of leather-based covering is in particular linked to a concern for producing the headrest at a lower cost.

[0004] Since leather is impermeable to foam, it is possible to consider its direct overmolding by the foam of the block.

[0005] The presence of the absorption element is motivated, at least in part, by the absence of a porous comfort underlayer on at least part of the cap; indeed, such an underlayer contributes, due to its porous nature, to the desired gas absorption.

[0006] With such an arrangement, the problem arises of ensuring that the absorption element is kept away from the headrest effectively, in order to guarantee the presence of a thickness of the foam block interposed between said element and said headrest, so as to guarantee homogeneous comfort of the headrest over its entire surface.

[0007] The invention aims to provide an arrangement that meets this expectation.

[0008] To this end, and according to a first aspect, the invention proposes a headrest for a motor vehicle seat, said headrest comprising: • a connecting frame to the back of said seat, said frame being based on a folded metal tube, so as to present two parallel rods intended to be inserted into sleeves provided at the top of the back of said seat, • a block of elastically compressible polyurethane foam padding overmolding said frame, • a covering cap for said block, said cap being overmolded by said block, said cap being formed of a plurality of covering formats combined together, at least one of said formats being leather-based and being devoid of a porous comfort underlayer so as to be directly overmolded by said block, • at least one porous absorption element intended to absorb gases - in particular in the form of carbon dioxide - resulting from the polyurethane formation reaction, said element being overmolded by said block, a thickness of foam from said block interposed between said element and said cap,

[0009] said absorption element being based on a flexible material having a general sleeve shape fitted onto said frame so as to be integral with it.

[0010] With such an embodiment, the maintenance of the absorption element at a distance from the cap is effectively ensured, which makes it possible to guarantee the presence of a thickness of the foam of the block interposed between said element and said cap.

[0011] In addition, the operation of associating the absorption element with the frame is particularly easy.

[0012] According to a second aspect, the invention proposes a method for making such a headrest.

[0013] In this description, the terms of positioning in space (transverse, vertical, superior, ...) are taken with reference to the vehicle in which the headrest is located in a situation of use, said vehicle extending longitudinally along its length, transversely along its width and vertically along its height.

[0014] Other features and advantages of the invention will become apparent from the following description, made with reference to the accompanying figures, in which:

[0015] [Fig. 1] is a schematic partial horizontal cross-sectional view of a headrest according to one embodiment,

[0016] [Fig.2a] and

[0017] [Fig.2b] are schematic views respectively in exploded partial perspective ([Fig.2a]) and not exploded ([Fig.2b]) of the headrest shown in [Fig.l].

[0018] With reference to the figures, a headrest 1 of a motor vehicle seat is described, said headrest comprising: • a frame 2 for connecting to a backrest of said seat, said frame being based on a bent metal tube, so as to present two rods 3 parallel – in this case, essentially vertical – designed to fit into slots provided at the top of the seat back, • a block 4 of elastically compressible polyurethane foam padding overmolding said frame, • a headpiece 5 covering said block, said headpiece being overmolded by said block, said headpiece being formed of a plurality of covering formats 6 joined together - in particular by stitching -, at least one of said formats 6a being leather-based and being devoid of a porous comfort underlayer (such an underlayer being usually made of elastically compressible porous foam, in particular less than 5 mm thick) so as to be directly overmolded by said block, • at least one porous absorption element 7 intended to absorb the gases produced by the polyurethane formation reaction, said element being overmolded by said block, with a layer of foam from said block interposed between said element and said cap,

[0019] said absorption element being based on a flexible material having a general sleeve shape fitted onto said frame so as to be integral with it.

[0020] According to the embodiment shown, the frame 2 has a general inverted U shape in longitudinal view, the branches of the U corresponding to the rods 3.

[0021] In an alternative not shown, the upper part of the frame 2 can be folded approximately 180° forward so as to present in cross-section a general inverted J shape.

[0022] According to the embodiment shown, the absorption element 7 is formed by a plate folded over itself so as to juxtapose two opposite edges 8, said edges being joined together - here by sewing 9, or by gluing, stapling, etc. according to variants not shown - so as to define the shape of the sleeve.

[0023] According to an unrepresented variant, the absorption element 7 is formed by molding.

[0024] According to one embodiment, the absorption element 7 is foam-based - in particular of polyurethane - elastically compressible.

[0025] According to one embodiment, the absorption element 7 has a thickness generally between 4 and 6 mm and a minimum length of 50 mm, so as to define a suitable gas absorption volume.

[0026] According to the embodiment shown, the headrest 1 is provided with two absorption elements 7 each threaded onto a respective rod 3 of the frame 2.

[0027] According to an unrepresented variant, the absorption element 7 is unique and fitted onto the two rods 3 of the frame 2 and onto the inter-rod area of ​​said frame.

[0028] According to one embodiment, the material of the absorption element 7 exhibits, for a specimen with a surface area of ​​20 cm² and a thickness of 5 mm, a permeability to air - measured according to ISO 9237 standard in force on the date of application - greater than 1800 lm².s

[0029] Finally, a method for manufacturing such a headrest 1 is described, said method comprising the following steps: • provide a frame 2 based on a bent metal tube, • provide at least one porous absorption element 7 made of flexible material with a general sleeve shape, • to fit said element onto said frame, • to introduce said frame provided with said element into a covering cap 5, said cap being formed of a plurality of covering formats associated with each other, at least one of said formats 6 being leather-based and being devoid of a porous comfort underlayer, • place said headdress, equipped with said frame and said element, in a mold, • inject into said cap a precursor mixture of elastically compressible polyurethane foam so as to form a block 4 of padding overmolding said cap, said frame and said absorption element, • Remove the headrest 1 from the mold.

Claims

Demands

1. A motor vehicle seat headrest (1), said headrest comprising: • a frame (2) for connecting to a backrest of said seat, said frame being based on a folded metal tube, so as to have two parallel rods (3) intended to fit into sleeves provided at the top of the backrest of said seat, • a block (4) of elastically compressible polyurethane foam padding overmolding said frame, • a cover (5) for said block, said cover being overmolded by said block, said cover being formed of a plurality of covering formats (6) joined together, at least one of said formats (6a) being leather-based and being devoid of a porous comfort underlayer so as to be directly overmolded by said block, • at least one porous absorption element (7) intended to absorb gases from the polyurethane formation reaction, said element being overmolded by said block,a layer of foam from said block interposed between said element and said headrest, said headrest being characterized in that said absorption element is made of a flexible material having a general sleeve shape fitted onto said frame so as to be integral with it.

2. Headrest (1) according to claim 1, characterized in that the absorption element (7) is formed by a plate folded over itself so as to juxtapose two opposite edges (8), said edges being associated with each other so as to define the sleeve shape.

3. Headrest (1) according to claim 1, characterized in that the absorption element (7) is formed by molding.

4. Headrest (1) according to any one of the preceding claims, characterized in that the absorption element (7) is based on elastically compressible foam.

5. Headrest (1) according to any one of the preceding claims, characterized in that the absorption element (7) typically has a thickness between 4 and 6 mm and a minimum length of 50 mm.

6. Headrest (1) according to any one of the preceding claims, characterized in that it is provided with two absorption elements (7) each threaded onto a respective rod (3) of the frame (2).

7. Headrest (1) according to any one of the preceding claims, characterized in that the material of the absorption element (7) has, for a test piece with a surface area of ​​20 cm2 and a thickness of 5 mm, an air permeability greater than 1800 Lm ".s1.

8. A method for making a headrest (1) according to any one of the preceding claims, said method comprising the following steps: • providing a frame (2) based on a folded metal tube, • providing at least one porous absorption element (7) based on a flexible material having a general sleeve shape, • fitting said element onto said frame, • inserting said frame provided with said element into a cover (5), said cover being formed of a plurality of covering formats (6) joined together, at least one of said formats (6a) being leather-based and being without a porous comfort underlayer, • placing said cover provided with said frame and said element in a mold, • injecting into said cover a precursor mixture of elastically compressible polyurethane foam so as to form a block (4) of padding overmolding said cover,said frame and said absorption element, • demold the resulting headrest (1).

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