FR3136714A1 - Seat support element with partially removable cover - Google Patents

Abstract

Seat support element with partially removable cover The invention relates to a seat support element (12; 13) comprising a main body (14; 60) and a cover (16; 62), the cover (16; 62) covering at least partially the main body (14; 60), the cap (16; 62) comprising at least one removable portion (42; 66), the removable portion (42; 66) covering a given surface of the main body (14; 60 ). The removable portion (42; 60) is in direct contact with the main body (14; 60) over at least 70%, preferably at least 80%, of the given surface. Figure for abstract: Figure 1

Description

Seat support element with partially removable cover

The present invention relates to a seat support element comprising a main body and a cover, the cover at least partially covering the main body, the cover comprising at least one removable portion, the removable portion covering a given surface of the main body.

Document FR 2 781 733 B1 describes a motor vehicle seat comprising a padding, an undercover in contact with the padding and integral with it, and a cover removably fixed by its edges to the undercover. The seat comprises connection means extending to the periphery of the cover and ensuring a separable connection of the cover with the under-cover.

This makes it possible to modify the cover, for example in the event of wear or dirt on the cover, in particular on the front side of the backrest which is particularly stressed.

However, the seat previously described includes an under-cover lining the cover.

This requires using a lot of additional material, compared to a simple cap, and is therefore expensive, not very ecological and complex.

One of the aims of the invention is to overcome these drawbacks by proposing a seat back requiring fewer materials.

For this purpose, the invention relates to a support element of the aforementioned type, in which the removable portion is in direct contact with the main body over at least 70%, preferably at least 80%, of the given surface.

In the absence of an under-cover covering the entire main body at the removable portion, the support element is particularly ecological and inexpensive.

The support element according to the invention may further comprise one or more of the following characteristics, considered in isolation or in any technically conceivable combination:

- the cap completely covers the main body, so as to form the exterior surface of the support element;

- the support element comprises an under-cover, the under-cover extending partially between the removable portion and the given surface of the main body, the under-cover being integral with the main body, the under-cover only partially covering the given surface area of the main body;

- the cap comprises a fixed portion, the fixed portion being fixed relative to the main body, the removable portion being fixed to the fixed portion by a reversible fixing means, preferably by a zipper;

- a first edge of the under-cover is fixed to the fixed portion, a second edge of the under-cover being fixed to the main body, more particularly to a frame of the main body;

- the support element comprises a housing for an airbag and an airbag module comprising an inflatable bag in the housing, the housing having an opening for deploying the airbag, the fixed portion and the undercover together covering the opening deployment;

- the under-cover is kept taut with the fixed portion in front of the deployment opening;

- the support element comprises a force concentrator, the force concentrator comprising a first portion fixed to the fixed portion and a second portion fixed to the under-cover, the first portion and the second portion of the force concentrator being connected by a weakened connection;

- the force concentrator surrounds the airbag module in the housing and has an opening at the level of the deployment opening of the airbag, the first portion and the second portion of the force concentrator delimiting the opening;

- the under-cowl has a height of between 5 centimeters and the height of the airbag module plus 100 mm;

- the support element comprises a central portion and two transverse sides on either side of the central portion, the under-cover externally covering only a portion of one of the two transverse sides;

- the support element is a seat back, the at least one removable portion comprising a first removable portion on the front face of the backrest; And

- the at least one removable portion comprises a second removable portion on the rear face of the backrest.

The invention further relates to a support element, more particularly a seat back, comprising a main body and a cover, the cover at least partially covering the main body, the cover comprising a fixed portion relative to the main body and two portions removable, each removable portion being fixed to the fixed portion by a reversible fixing means, preferably by a zipper.

A first of the two removable portions extends over the front of the backrest. The corresponding reversible fixing means thus makes it possible to remove a rear portion of the backrest cover.

A second of the two removable portions extends over the rear side of the backrest. The corresponding reversible fixing means thus makes it possible to remove a front portion of the backrest cover.

Other aspects and advantages of the invention will appear on reading the description which follows, given by way of example and made with reference to the appended drawings, in which:

there is a perspective view of a seat comprising a backrest and a seat according to embodiments of the invention,

there is a sectional view along plane P of a portion of the seat back of the , according to a first embodiment, the backrest comprising a removable cover portion, the removable portion being fixed,

there is a view similar to the , the removable portion being detached, and

there is a sectional view along plane P of the seat back of the , according to a second embodiment, the backrest comprising two removable cover portions, the two removable portions being separated.

In reference to the , we describe a vehicle seat 10, such as a motor vehicle seat, comprising a backrest 12 and a seat 13.

Each of the backrest 12 and the seat 13 forms a support element.

The invention relates to a seat support element 10, more particularly here a backrest 12 and/or a seat 13 of a seat.

The backrest 12 is produced according to a first example of an embodiment of a support element according to the invention.

The backrest 12 comprises a main body 14, a cover 16 and a sub-cover 18.

The main body 14 comprises a frame 20 and a foam body 21.

The frame 20 is for example formed by metal profiles assembled together and forms a support frame for the other elements of the seat back. For this purpose, the frame 20 comprises at least two branches 22 extending in the direction of elevation of the backrest, corresponding to the height thereof.

The branches 22 are spaced from one another in a transverse direction substantially perpendicular to the direction of elevation and corresponding to the width of the backrest. In known manner, the branches 22 are for example connected to each other by a lower crosspiece and an upper crosspiece (not shown) extending in the transverse direction to the lower and upper ends of the branches 22 and spaced apart from one another. on the other according to the direction of elevation.

The frame 20 defines an external face and an internal face extending on either side of the frame in a longitudinal direction substantially perpendicular to the direction of elevation and the transverse direction and corresponding to the thickness e of the backrest. The external face corresponds for example to the back of the backrest, turned towards the rear of the vehicle when the seat faces the front of the vehicle, and the internal face extends for example towards the receiving surface of a passenger , on which a passenger's back rests when seated on the seat.

According to the embodiment shown, each branch 22 has a U-shaped section and comprises a main wall 24 forming the base of the U and two side walls 26 forming the branches of the U and extending on either side of the main wall 24. The main wall 24 extends in the longitudinal direction between the external and internal faces of the frame 20 while one of the side walls 26 forms an edge of the external face and the other side wall 26 forms an edge of the internal face in the transverse direction.

The cavities of the branches 22, defined for each branch 22 by the main wall 24 and the side walls 26 thereof, face each other. In other words, the main walls 24 of the branches 22 form the edges of the frame in the transverse direction.

The frame 20 forms a support structure for the other parts of the backrest. That is to say, the other parts, such as the foam body 21, are mounted on the frame 20. Other parts can be mounted on the frame 20, such as a headrest and a articulated connection system at the seat base.

The foam body 21 is fixed on the frame 20, at least on the side of the internal face thereof, as more particularly visible on the .

More particularly, the foam body 21 is mounted to rest on a deflection sheet formed for example by metal slats and mounted on the frame 20 between the branches 22 on the side of the internal face of the frame.

The foam body 21 forms a padding adapted to the reception of the passenger, more particularly his back, when he is seated on the seat. For this purpose, the foam body 21 can have any shape adapted for the comfort of the passenger.

The foam body 21 covers, for example, the entire frame formed by the frame 20 on the side of the internal face 26.

The foam body 21 is for example fixed on the branches 22 so that the main walls 24 and at least the side walls 26 on the side of the internal face are surrounded by the foam body 21.

The foam body 21 forms, here, a central portion of the passenger receiving surface, adapted to receive the passenger's back, and two padded sides extending on either side of the central portion.

In one embodiment, on the external side, the backrest does not have a foam body.

Alternatively, the foam body 21 also covers the external face.

The main body 14 delimits a housing 28 for an inflatable bag.

The housing 28 extends here on a transverse side of the main body relative to the frame 20. More particularly, the housing extends outside one of the branches 22 opposite the cavity of said branch .

More particularly, the housing 28 is delimited by the frame 20 and the foam body 21, more particularly by a branch 22 and the foam body 21, more particularly by the main wall 24 of said branch 22 and the foam body 21 .

The housing 28 is here arranged in one of the padded sides formed by the foam body 21.

The backrest 12 includes an airbag module 30 including an airbag in the housing 28.

The housing 28 has a deployment opening 32 of the inflatable bag, here a single deployment opening 32.

The deployment opening 32 extends over a transverse end of the backrest 12.

The deployment opening 32 is delimited by the foam body 21.

The deployment opening 32 connects the housing 28 to the exterior of the main body 12.

The deployment opening 32 is arranged opposite the frame 20 relative to the housing 28, more particularly in the transverse direction.

The backrest 12 further includes a force concentrator 34.

The force concentrator 34 is adapted to direct the deployment of the airbag towards the deployment opening 32.

Here, the force concentrator 34 surrounds the airbag module 20 in the housing 28 and has an opening 36, more particularly a single opening 36, arranged at the level of the deployment opening 32.

Thus, in the event of deployment of the airbag, the airbag module 20 being surrounded by the force concentrator 34, the airbag inflates towards the opening 36 and therefore deploys at the level of the deployment opening 32.

The force concentrator 34 is made of a material having little or no elongation properties. The force concentrator 34 is, for example, a woven textile made of polyester.

The opening 36 has edges delimited by a first portion 38 and a second portion 40 of the force concentrator.

The first portion 38 is fixed to the fixed portion 44 of the cap 16, described below. The second portion 40 is fixed to the under-cover 18.

The first portion 38 and the second portion 40 of the force concentrator are connected by a weakened connection, for example a weakened seam.

This will be described in more detail later.

The cover 16 covers the main body 14 so as to form the exterior surface of the backrest 12, that is to say the visible part of the backrest 12 from the passenger compartment of the vehicle. The cap 16 here completely covers the main body 14.

The cover 16 therefore gives its appearance and feel to the backrest 12 and can thus be made of any material suitable for this purpose. The headdress can be made of textile material or skin made of natural material, such as leather, or synthetic.

The cap 16 comprises at least one removable portion 42 and here a fixed portion 44.

The or each removable portion 42 covers a given surface of the main body 20.

The fixed portion 44 covers the rest of the main body 14.

More particularly, the fixed portion 44 and the removable portion(s) 42 together cover the main body 20, here without overlap.

The fixed portion and the or each removable portion 42 do not overlap.

In the embodiment of Figures 2 and 3, the cover 16 comprises a single removable portion 42 on the front face of the backrest 12.

The single removable portion 42 extends here over the entire front face of the backrest 12.

The fixed portion 44 extends, in the example shown in Figures 2 and 3, over the entire rear face, the transverse sides, an upper surface and a lower surface of the backrest 12.

The fixed portion 44 is fixed relative to the main body 14.

The fixed portion 44 is, for example, fixed to the foam body 21, for example by return means.

Alternatively or additionally, the fixed portion 44 is held fixed around the main body 14, by maintaining tension around the main body 14. More particularly, the fixed portion 44 is placed around the main body 14 in force and encloses the main body 14, so that the fixed portion 44 is held in place around the main body 14.

The removable portion 42 is fixed to the fixed portion 44 by a reversible fixing means 46, preferably by a zipper.

Each of the removable portion 42 and the fixed portion 44 comprises, for example, a respective portion of the reversible fixing means 46. For example, each of the removable portion 42 and the fixed portion 44 comprises a rack of the zipper .

More particularly, the removable portion 42 is fixed to the fixed portion 44 by the reversible fixing means 46 over its entire periphery.

The removable portion is, in one embodiment, connected to the foam body of the main body 14 by hook-and-loop fastening means and/or one or more so-called clip-on fasteners.

The under-cover 18 extends partially between the removable portion 42 and the given surface of the main body 14.

The under-cap 18 only partially covers the given surface of the main body 14.

The removable portion 42 is thus in direct contact with the main body 14 over at least 70%, preferably at least 80%, of the surface of the removable portion, that is to say of the given surface.

Thus, the undercover 18 covers strictly less than 30%, preferably strictly less than 20%, of the given surface.

In the example shown, the under-cover 18 comprises, more particularly, an external portion 48, and here an internal portion 50. The under-cover 18 here consists of the external portion 48 and the internal portion 50.

The external portion 48 extends between, on one side, the removable portion 42 and the reversible fixing means 46 and, on the other side, only a portion of the given surface of the main body 14.

The internal portion 50 extends within the main body 20.

More particularly, the foam body 21 has an opening 51. The opening 51 passes through the foam body 21 from outside the main body until it opens facing the frame 20, more particularly a branch 22, more particularly of the branch 22 outside of which the housing 28 is arranged.

The opening 51 opens here outside the main body between the central portion and the padded side on which the housing 28 formed by the foam body 21 is arranged.

The internal portion 50 extends through the opening 51 to the frame 20, here the branch 22.

The under-cover 18 is stretched over the main body 14.

The under-cover 18 is fixed relative to the fixed portion 44 and the main body 14.

The under-cap 18 has a first edge 52 and a second edge 54 opposite the first edge 52.

The first edge 52 belongs to the external portion 48 and the second edge 54 to the internal portion 50.

The first edge 52 of the under-cap 18 is fixed to the fixed portion 44 of the cap, more particularly to the end of the fixed portion 44 provided with the reversible fixing means 46.

More particularly, the first edge 52 is fixed to the portion of the reversible fixing means 46 secured to the fixed portion 44 and to the fixed portion 44.

More particularly, the following elements are fixed together, in this order, by a single fixing 56, here weakened: the first portion 38 of the force concentrator 34, the fixed portion 44, the portion of the reversible fixing means 46 secured to the portion fixed 44, the first edge 52 of the under-cover 48, and the second portion 40 of the force concentrator 34.

The fixed portion 44 and the under-cover 18 together cover the deployment opening 32.

The undercover 18 is held taut with the fixed portion 44 in front of the deployment opening 32.

The fastener 56 is, for example, a weakened seam, for example of the 40/80 Tex type, that is to say made with threads having a count of between 40 and 80 tex. More particularly, here, the sewing is carried out with two threads of respective count 40 tex and 80 tex.

The weakened seam is, for example, made with polyester thread.

The second edge 54 of the under-cover 18 is fixed to the main body, more particularly to the frame 20, more particularly to a branch 22, more particularly to the branch 22 outside of which the housing 28 is arranged.

The second edge 54 is, for example, provided with a profile, for example plastic, the profile being clipped to the branch 22. The profile is, for example, sewn to the second edge 54. Additionally or alternatively, the second edge 54 is , for example fixed by a screw and nut system on the frame 20, more particularly on the branch 22.

Between the first edge 52 and the second edge 54, the undercover 18 is stretched over the main body 14.

The under-cover has a height, measured in the direction of elevation of the backrest, of between 5 centimeters and the height of the airbag module described below plus 100 mm.

The under-cover 18 extends externally only over a portion of one of the padded sides defined by the foam body, more particularly on the padded side surrounding the housing 28.

The undercap 18 does not extend over the central portion defined by the foam body.

The undercap 18 is made of a material having little or no elongation properties. The undercover 18 is, for example, a woven textile made of polyester.

The under-cover 18 and the fixed portion 44 thus surround the housing 28 together, so that, when the removable portion 42 is removed by a user, the integrity of the housing 28 and thus of the inflatable bag mode 30 is not compromise.

The user does not have access to said module, the proper functioning of which is therefore not compromised by any action by the user.

The presence of the under-cover thus makes it possible to cover desired portions of the main body, including in the absence of the removable portion, to guarantee the integrity of sensitive portions of the seat back.

In one embodiment, the seat back only comprises a housing with an airbag module on one side, more particularly on the side intended to be arranged facing a door of the vehicle.

On the other side, the backrest does not include an airbag module, the foam body for example surrounding directly the external side of the main wall of the corresponding branch. On this side, the backrest does not have an undercover.

Alternatively, the seat back includes a housing with airbag module on each side. The arrangement described previously is then present for each side of the backrest.

The file then includes, for example, an undercover on each side.

The seat 13 is made according to a second example of an embodiment of a support element according to the invention.

The seat 13 is adapted to accommodate a passenger on an upper surface.

The seat 13 comprises a main body 60, structurally similar to that of the backrest, that is to say it comprises a frame and a foam body as described previously.

The main body 60 of the seat 13, and more particularly its frame, extends perpendicular to the backrest, within 20°. It extends approximately parallel to the running surface of the vehicle.

The foam body covers at least an entire upper surface of the frame, the foam body forming a padding adapted to receive a passenger, more particularly their lower half, when the latter is seated in the seat.

In this embodiment, the foam course of the seat is devoid of housing for an inflation cushion, the seat being devoid of an inflatable cushion module.

The seat also includes a cover 62.

The cap 62 here covers at least partially the main body 60, more particularly at least one upper surface and the sides of the main body.

The cover 62 forms the visible exterior surface of the seat 13, that is to say the visible part of the seat 13 from the passenger compartment of the vehicle.

The cover 62 therefore gives its appearance and feel to the seat and can thus be made of any material suitable for this purpose. The headdress can be made of textile material or skin made of natural material, such as leather, or synthetic.

Alternatively, the cap 62 completely covers the main body 60.

As with the backrest, the cover 62 comprises a fixed portion 64 and at least one, here one, removable portion 66.

The or each removable portion 66 covers a given surface of the main body.

The fixed portion and the or each removable portion 66 do not overlap.

In the embodiment of the , the cover 62 comprises a single removable portion 66 on the upper face of the seat 13, on which a passenger sits.

The fixed portion 64 is fixed relative to the main body 60.

The fixed portion 64 is, for example, fixed to the foam body, for example by return means.

Alternatively or additionally, the fixed portion 64 is held fixed around the main body 60, by maintaining tension around the main body 60. More particularly, the fixed portion 64 is placed around the sides of the main body 60 in force and forms a closed headband enclosing the main body 60, so that the fixed portion 64 is held in place around the main body 60.

Alternatively or additionally, the fixed portion 64 is fixed to the frame of the main body 60. The frame is, for example, accessible from below the seat 13. More particularly, in the case where cover 62 does not cover the The entire main body 60, one edge of the fixed portion 64, opposite the removable portion, is provided with a profile, for example plastic, the profile being clipped to a branch of the frame. The profile is, for example, sewn to the edge. The edge of the fixed portion 64 is, for example, arranged in a lower area of the seat, not visible to people in the passenger compartment.

The removable portion 66 is fixed to the fixed portion 60 by a reversible fixing means 68, preferably by a zipper, similar to what has been described with regard to the file.

The removable portion 66 is here fixed to the fixed portion 64 by the reversible fixing means 68 over its entire perimeter.

The removable portion is, in one embodiment, connected to the foam body of the main body 60 by hook-and-loop fastening means and/or one or more so-called clip-on fasteners.

The seat 13 also has no undercover as described next to the backrest.

Thus, the removable portion 66 is in direct contact with the main body 60 over the entire surface of the removable portion, that is to say the given surface.

In an embodiment not shown, the seat comprises an airbag module, the seat being adapted and comprising an under-cover, as described next to the backrest.

An alternative embodiment of the file of the is represented on the .

The elements common with the first embodiment are similarly referenced incremented by 100.

This embodiment differs from the previous embodiment in that the cap 116 comprises two removable portions 142, 143.

A first removable portion 142 extends on the front face of the backrest and is similar and is arranged similarly to what has been described with regard to the removable portion 42 of the first embodiment.

The file includes a first under-cover 118 corresponding to the under-cover 18 described with regard to the first embodiment.

All of the characteristics described with regard to the first embodiment apply here, apart from the differences mentioned.

The second removable portion 143 extends, for example, here on the rear face of the backrest.

The fixed portion 144 extends, in this example, only on the transverse sides, an upper surface and a lower surface of the backrest.

The second removable portion 143 is fixed to the fixed portion 144 by a second reversible fixing means 147, for example a zipper, over its entire periphery.

The backrest further comprises a second sub-cover 119, integral with the main body 114.

The second under-cap 119 has a first edge 153 and a second edge 155 opposite the first edge 153.

The first edge 153 of the second sub-cap 119 is fixed to the fixed portion 144 of the cap, more particularly to the end of the fixed portion 144 provided with the second reversible fixing means 147.

The second edge 155 of the second sub-cap 119 is fixed to the main body, more particularly to the frame 120, more particularly to the branch 122 outside of which the housing 128 is arranged.

The second edge 155 of the second sub-cap 119 is, for example, fixed to the main body similarly to the edge 54 of the sub-cap 18 described with regard to the first embodiment.

The second under-cover 119 is stretched over the main body between the first edge 153 and the second edge 155.

The second under-cover has a height, measured in the direction of elevation of the backrest, of between 5 centimeters and the height of the airbag module described below plus 100 mm.

The second under-cover 119 extends externally only over a portion of one of the padded sides defined by the foam body, more particularly on the padded side surrounding the housing 128.

The second sub-cap 119 is made of a material having little or no elongation properties. The undercover 18 is, for example, a woven textile made of polyester.

The first under-cover 118, the fixed portion 144 and the second under-cover 119 thus surround the housing 128 together, so that, when the removable portions 142, 143 are removed by a user, the integrity of the housing 128 and thus of airbag mode 130 is not compromised.

Similar to the first embodiment, the user then does not have access to said module, the proper functioning of which is therefore not compromised by a possible act of the user.

As previously, a module for an airbag is, for example, present on only one side of the backrest, more particularly on the side intended to be arranged facing a vehicle door. On the other side, the backrest does not include an airbag module, the foam body for example surrounding directly the external side of the main wall of the corresponding branch. On this side, the file does not have any under-cover(s).

Alternatively, the backrest includes a housing with airbag module on each side. The arrangement described above is then present, for example symmetrically, for each side of the backrest.

The seat back according to the invention makes it possible to modify a portion of the cover, for example in the event of wear or indelible stains.

The presence of the under-cowl(s) makes it possible to guarantee the integrity of sensitive portions of the seat back, more particularly here of an airbag housing.

The under-cover only extends over a portion of the given surface, more particularly here only to cover the sensitive equipment corresponding here to the airbag module, this is particularly ecological.

Claims (13)

Seat support element (12; 13) comprising a main body (14; 60; 114) and a cap (16; 62; 116), the cap (16; 62; 116) at least partially covering the main body (14 ; 60; 114), the cap (16; 62; 116) comprising at least one removable portion (42; 66; 142, 143), the removable portion (42; 66; 142, 143) covering a given surface of the main body (14; 60; 114), characterized in that the removable portion (42; 66; 142, 143) is in direct contact with the main body (14; 60; 114) over at least 70%, preferably at least 80%. %, of the given surface. Seat support element according to claim 1, wherein the cap (16; 62; 116) completely covers the main body (14; 60; 114), so as to form the outer surface of the support element (12; 13). Seat support element according to claim 1 or 2, comprising an under-cover (18; 118, 119), the under-cover (18; 118, 119) extending partially between the removable portion (42; 142, 143 ) and the given surface of the main body (14; 114), the under-cover (18; 118, 119) being integral with the main body (14; 114), the under-cover (18; 118, 119) only partially covering the given surface of the main body (14; 114). Seat support element according to claim 3, in which the cap (16; 116) comprises a fixed portion (44; 144), the fixed portion (44; 144) being fixed relative to the main body (14; 114), the removable portion (42; 142, 143) being fixed to the fixed portion (44; 144) by reversible fixing means (46, 68; 147), preferably by a zipper. Seat support element according to claim 4, in which a first edge of the under-cover (18; 118, 119) is fixed to the fixed portion (44; 144), a second edge of the under-cover (18; 118, 119) being fixed to the main body (14; 114), more particularly to an armature (20; 120) of the main body (14; 114). Seat support member according to claim 4 or 5, comprising an airbag housing (28; 128) and an airbag module (30; 130) comprising an airbag in the housing (28; 128), the housing ( 28; 128) having a deployment opening (32) of the inflatable bag, the fixed portion (44; 144) and the under-cover (18; 118, 119) together covering the deployment opening (32). Seat support element according to claim 6, in which the under-cover (18; 118, 119) is held taut with the fixed portion (44; 144) in front of the deployment opening (32). Seat support element according to claim 6 or 7, comprising a force concentrator (34), the force concentrator (34) comprising a first portion (38) fixed to the fixed portion (44; 144) and a second portion ( 40) fixed to the under-cover (18; 118, 119), the first portion (38) and the second portion (40) of the force concentrator (34) being connected by a weakened connection (56). A seat support member according to claim 8, wherein the force concentrator surrounds the airbag module (30; 130) in the housing (28; 128) and has an opening (36) at the deployment opening (32) of the inflatable bag, the first portion (38) and the second portion (40) of the force concentrator (34) delimiting the opening (36). Seat support element according to any one of claims 6 to 9, in which the under-cowl (18; 118, 119) has a height of between 5 centimeters and the height of the airbag module (30; 130) added 100mm. Seat support element according to any one of claims 3 to 10, comprising a central portion and two transverse sides on either side of the central portion, the under-cover (18; 118, 119) externally covering only one portion of one of the two transverse sides. Seat support element according to any one of claims 1 to 11, in which the support element is a seat back (12), the at least one removable portion (42; 142, 143) comprising a first portion removable (42; 142) on the front face of the backrest (12). Seat support element according to claim 12, in which the at least one removable portion (142, 143) comprises a second removable portion (143) on the rear face of the backrest (12).