Quilting system

Abstract

This disclosure relates to a padding system (1) comprising: - padding (2) including a groove (20) on a surface of the padding intended to receive an occupant, a hole (21) extending into the depth of a bottom wall of the groove, - a removable fastening device integral with the padding (2), configured to secure a headgear to said padding, the fastening device comprising a first fastening portion (30) and a second attachment portion extending into the hole (21) including at least one stop wall (PB) configured to come into contact with at least one shoulder (EP) during a tensile force generated by the headgear to prevent extraction of the fastening device. Abstract figure: Figure 3

Description

Title of the invention: Padding system

[0001] This disclosure relates to a padding and a fastening device attached to the padding configured to ensure the retention of a headgear on the padding. technical field

[0002] The present disclosure falls within the domain of fastening devices configured to fix a headgear to a mattress. Previous technique

[0003] Seat cushions are typically made primarily of urethane polymer foam (or polyurethane, PU), particularly polyurethane foam obtained from polyether / polyol (or PUR) type polyols. Such foams can be relatively easily shaped in molds to form different cushion shapes for various vehicle seat components, such as the seat cushion and backrest.

[0004] It is also known to incorporate fasteners, such as rods, into the mold as inserts. These fasteners allow, in particular, the attachment of a headgear to be fixed to the padding by clipping onto the insert fasteners.

[0005] Polyurethane foam padding is satisfactory, but can retain moisture, particularly in humid conditions. This can cause discomfort for an occupant of a vehicle seat containing such padding.

[0006] Furthermore, polyurethane foam is conventionally produced by mixing, among other things, polyols with isocyanates. The chemical reaction carried out emits CO2 to form a foam, and the emitted CO2 contributes to global warming.

[0007] Furthermore, polyurethane foam is not recyclable. Therefore, at the end of their life, the seats are dismantled and sorted to separate the recyclable components from the non-recyclable ones. The recyclable components are then ground up to form a new raw material, while the non-recyclable components are typically landfilled or, if possible, incinerated to generate energy.

[0008] However, prior art, in particular application FR 3,139,025 A1, is known for a quilting formed from a 3D entanglement of continuous fibers, arranged irregularly to form loops welded together, which is breathable and less CO2-intensive to manufacture. The fasteners conventionally used in Inserts in polyurethane foam mattresses are not compatible with this 3D entanglement of continuous fibers.

[0009] The application FR 3.139.025 Al teaches how to densify and stiffen local areas of the 3D entanglement to allow the attachment of a cap to the padding, and according to various techniques.

[0010] According to the findings there is a need for other fastening systems suitable for attaching a headgear to padding, and in particular to padding formed from a 3D entanglement of continuous fibers. Summary

[0011] This disclosure improves the situation.

[0012] A padding system is proposed comprising: - a padding comprising a groove on a surface of the padding intended to receive an occupant, a hole extending along an axis in depth from a bottom wall of the groove, said hole comprising a first passage section, on a first portion of the hole, in particular upper, and at least a second passage section, extending along the axis of the hole, on a second portion of the hole, in particular lower, said at least a second passage section being wider than the first passage section, forming at least a shoulder between the first lower portion and the second upper portion of said hole, - a removable fastening device, integral with the padding, configured to secure a headband to said padding, the fastening device comprising: — a first fixing part comprising in particular a deformable elastic portion, configured to allow the fixing of the cap, said first fixing part being kept protruding in the groove — a second attachment part extending into the hole comprising at least one stop wall (configured to come into contact against said at least one shoulder during a tensile force generated by the cap to prevent extraction of the fastening device.

[0013] The features described in the following paragraphs may optionally be implemented independently of each other or in combination with each other:

[0014] According to one embodiment, said fastening device has at least one counter-button wall, configured to bear against the bottom wall of the groove, and such that the first portion of the padding is interposed between said at least one counter-button wall and said at least one stop wall, along the axis of the hole, in particular the counter-button wall forming a peripheral wall extending around a base of the first fastening part in a manner integral with the base. According to one embodiment, the second fastening part comprises said at least one stop wall, and at least one rod extending, from a proximal end of said at least one rod, projecting from said at least one stop wall, said rod extending through the first portion of the padding in the padding in the vicinity of the hole, substantially parallel to an axis of the hole, and to a distal end of said at least one rod opening into said groove.

[0015] According to one embodiment, said at least one counter-stop wall is configured as at least one removable flap, configured to move from a retracted position configured to ensure the insertion of the fastening device, from an opening of the hole on the side opposite the groove, to a deployed position for which said at least one flap fits onto the distal end of the rod, forming said at least one counter-stop wall configured to bear against the bottom wall of the groove.

[0016] According to one embodiment, said at least one stop wall comprises a first stop wall and a second stop wall configured respectively to bear against a first shoulder and a second shoulder, extending transversely, diametrically opposite, on either side of the axis of the hole, and in which said at least one rod comprises a first rod projecting from the first stop wall and a second rod projecting from the second stop wall, and in which said at least one flap comprises a first flap, removable, configured to fit onto the distal end of the first rod by forming a first counter-stop wall and a second removable flap, configured to fit onto the distal end of the second rod by forming a second counter-stop wall, said first counter-stop wall and the second counter-stop wall configured to bear against the bottom of the groove,on either side of the hole.

[0017] According to one embodiment, said at least one flap, where applicable the first flap and the second flap 5, is articulated to a body of the fastening device by a flexible hinge.

[0018] According to one embodiment, said at least one shoulder comprises - a first shoulder arranged at a first distance from the bottom of the groove along a direction parallel to an axis of the hole, - a second shoulder arranged at a second distance from the bottom of the groove along the direction parallel to the axis of the hole, and in which the first shoulder and the second shoulder are arranged on either side of the axis of the hole, the first distance being greater than the second distance, and in which the second attachment part comprises a first leg extending from the first attachment part, to a terminal end forming a first stop wall configured to come into contact with the first shoulder, and a second leg extending from the first fitting to a terminal end forming a second stop wall, and wherein the first stop wall and the second stop wall are spaced apart, with a transverse dimension to the axis of the hole greater than a diameter of the first passage section, and in which the removable fastening device is configured to be put in place and fixed to the padding, by inserting the fastening device, at an angle to the axis of the hole, and its second attachment part, into the hole, from an opening of the hole in the bottom wall of the groove by inserting the first leg and tilting the fastening device relative to the axis of the hole until it brings the first stop wall and the first shoulder into contact, the first leg and / or the second leg (J2) configured elastically deformable, so that the second stop wall is in contact with a lateral wall of the hole of the first section of the hole,This causes an elastic deformation of the second attachment part, resulting in the first and second stop walls moving closer together until the second stop wall unfolds, securing the second shoulder when the first and second stop walls elastically return to their original position, moving apart from each other.

[0019] According to one embodiment, the first fastening part comprises a first element and a second element, the first element and the second element protruding from a base forming a hook groove, the first element and the second element being elastically deformable so as to allow an elastic fit of a hook rib of a cap.

[0020] According to one embodiment, the fastening device, including the first fastening part and the second attachment part, is a single-piece plastic component.

[0021] According to one embodiment, the padding comprises a 3D entanglement of continuous thermoplastic fibers arranged irregularly forming loops welded together, said groove and hole being formed in said 3D entanglement of fibers.

[0022] According to one embodiment, the padding material and the material of said fastening device are a thermoplastic polymer whose main chain repeating pattern includes the ester function and optionally the ether function.

[0023] The present disclosure is further to a vehicle seat assembly comprising a padding system according to the present disclosure, and a cover covering all or part of the padding, and fixed to the padding by a fastening element engaging in particular by elastic interlocking, with the first fastening part of the fastening device.

[0024] This disclosure further relates to a method for manufacturing a padding system according to this disclosure comprising: - / A / Obtaining a quilting by extruding a 3D tangle of continuous thermoplastic fibers arranged irregularly, forming loops welded together, - / B / Shaping of the 3D interlocking by thermoforming to obtain the groove and the hole having the first passage section, on a first portion of the hole, and the second passage section, extending from said first section along the axis of the hole, on a second portion of the hole, the second passage section being wider than the first passage section, with the formation of at least one shoulder between the first lower portion and the second upper portion of said hole, - / C / Provision of a fastening device comprising: — a first fixing part comprising in particular a deformable elastic portion, configured to allow the fixation of the cap, said first fixing part being held protruding in the groove, — a second attachment part configured to extend into the hole, comprising at least one stop wall - / D / Insertion of the fastening device into the hole such that the first portion of the fastening is positioned in the groove, projecting from the bottom wall of the groove, said at least one stop wall in a position in the second portion of the hole configured to come into contact against said at least one shoulder during a tensile force generated by the cover to prevent extraction of the fastening device.

[0025] The present disclosure further relates to a method for recycling a vehicle seat assembly according to the present disclosure, in which the padding material and said fastening device is a thermoplastic polymer whose main chain repeating pattern includes the ester function and optionally the ether function, comprising: - optionally, a separation of the headgear from the padding system, - grinding of the padding and the fastening device attached to the padding, for the purpose of producing granules - the use of the granules for the manufacture of a plastic product based on a thermoplastic polymer whose main chain repeating pattern includes the ester function and possibly the ether function, in particular by molding or extrusion. Brief description of the drawings

[0026] Other features, details and advantages will become apparent upon reading the detailed description below, and upon analysis of the accompanying drawings, on which: Fig. 1

[0027] [Fig.1] is seen from a padding system according to a first embodiment, comprising padding and a fastening device comprising a first fastening part, in particular a protruding clip of a bottom wall of a groove, and a second fastening part received in a hole extending through the padding, from the bottom wall of the groove. Fig. 2

[0028] [Fig.2] is a detail view of the fastening device which includes the first fastening part in particular of clipping comprising, from a base, a first element and a second protruding element, elastically deformable, and forming between them a hook groove for clipping a male clipping element, integral with an edge of a cap and the second fastening part, comprising, protruding from the base, on the opposite side of the base with respect to the first and second elements, a first leg ending in a first stop wall, and a second leg ending in a second stop wall. Fig. 3

[0029] [Fig.3] is a cross-sectional view of the closure system along a cutting plane passing through the axis of the hole, illustrating the fixing device in the hole of the padding, the fixing device attached to the padding by a portion of the padding interposed between, on the one hand, the first stop and the second stop bearing respectively against the first shoulder, and the second shoulder, and on the other hand, a counter-stop wall, peripheral around the base, bearing against the bottom wall of the groove. Fig. 4

[0030] [Fig.4] is a profile view of the fastening device. Fig. 5

[0031] [Fig.5] is a view of the installation of the fastening device in the hole in the padding, by placing it at an angle by inserting the first leg and tilting the fastening device relative to the axis of the hole until the first stop wall and the first shoulder come into contact, the first leg and the second leg being elastically deformable, so that the second stop wall in contact with a lateral wall of the hole of the first section of the hole causes an elastic deformation of the second part of the attachment causing the first stop wall and the second stop wall to come together until the second stop wall comes out, ensuring the hooking of the second shoulder when the first stop wall and the second stop wall return elastically to position by moving apart. Fig. 6

[0032] [Fig.6] is a view of the padding system according to a second embodiment, which includes a padding and a fastening device comprising a first fastening part, in particular a protruding clip on a bottom wall of a groove, and a second fastening part received in a hole extending through the padding, from the bottom wall of the groove. Fig. 7

[0033] [Fig.7] is a view of the assembly of the fastening device to the padding which is carried out through a lower opening of the hole, opposite the opening of the hole emerging from the bottom wall of the groove, the first fastening part being inserted through the hole until said first fastening part emerges from the hole and is positioned projecting into the groove, the second fastening part comprising a fastening body extending from a base of the first fastening part along the upper portion of the hole, presenting the first section, as well as a first stop wall and a second stop wall projecting laterally from a portion of the fastening body capable of coming into contact with a first shoulder and a second shoulder, the fastening device notably comprising - a first flap, and a second flap, in retracted positions, allowing the flaps in retracted positions to pass through the first section of the hole,until the first and second flaps emerge from the hole in the groove – a first protruding rod from the first stop wall and a second protruding rod from the second stop wall, the rods oriented parallel to the axis of the hole, the rods configured to pass through the padding material, on either side of the hole, until a free distal end of the first rod and a distal end of the second rod protrude from the bottom wall of the groove. Fig. 8

[0034] [Fig.8] is a consecutive view for which the fastening device is locked on the padding by pivoting: - of the first flap, around a first hinge until a fit is obtained between the first flap and the distal end of the first rod, the first flap having an opening configured to receive said distal end in a fit, - of the second flap, around a second hinge until a fit is achieved between the second flap and the distal end of the second rod, the second flap having an opening configured to receive said distal end in a fit. Fig. 9

[0035] [Fig.9] is a detailed view of the fastening device of the padding system in The deployed positions of the first and second flaps, configured to rest against the back wall to form a counter-stop wall (Fig. 10)

[0036] [Fig. 10] is a view of a method of manufacturing the padding by extruding thermoplastic fibers, including an accumulation of fibers to obtain an entanglement of continuous fibers arranged irregularly forming loops welded together, and solidification of the entanglement of continuous fibers in a coolant. Description of the implementation methods

[0037] This disclosure relates to a padding system 1 comprising padding 2 and a removable fastening device 3, the fastening device being integral with the padding configured to allow the attachment of a cover over the padding 2, preferably under tension on the padding.

[0038] The padding may comprise a 3D entanglement of continuous thermoplastic fibers arranged irregularly, forming loops welded together, to which the fastening device 3 is attached. Generally, the fibers of the 3D entanglement, typically polyester-based, may be hollow and / or solid fibers. The fibers may have a diameter between 0.2 mm and 2 mm, preferably between 0.3 mm and 1.5 mm. The term "continuous" in "continuous fibers" means that the fibers are much longer than their diameter, and due to the manufacturing process, which is described below, typically by a ratio of at least 100, or even 500, or even 1000.

[0039] The 3D entanglement of continuous fibers can have an apparent density between 20kg / m3 and 70 kg / m3, in particular between 45 kg / m3 and 60 kg / m3, preferably between 35 and 70kg / m3.

[0040] For example, the composition of the fibers, or even of the padding, includes: - 95% to 99% by weight of a first polymer from the polyester family such as PBT (Polybutylene terephthalate), - 1% to 5% by weight of a second polymer from the polyester family such as PTT (Trimethylene Polyterephthalate) or another polyester.

[0041] Often, and especially as can be understood from the extrusion manufacturing process which will be described below, the fibers typically extend from a first end on a first edge of the 3D entanglement and to a second end on a second edge of the 3D entanglement, opposite to the first edge.

[0042] Preferably, the voids between the fibers of the 3D fiber entanglement of the first layer 31 of the padding are left free. This results in a highly breathable padding, due to the numerous inter-spaces between the fibers which promote air circulation, and in contrast to a molded polyurethane body, which is closer to an air-impermeable body, comparatively.

[0043] The padding may be, but not limited to, seat padding, in particular seat padding, or backrest padding, armrest padding, or any other type of seat padding

[0044] The padding 2 comprises a groove 20 extending in depth on the surface of the padding, intended to receive an occupant, and a hole 1 extending along an axis A in depth from a bottom wall of the groove. The hole preferably passes through from an opening on the bottom wall of the groove to an opening on the side of the padding opposite the groove. The hole extends, in particular, along a thickness of the padding. When the padding 2 comprises the 3D entanglement of thermoplastic fibers, said groove 20 and hole 21 can be formed in said 3D entanglement of thermoplastic fibers, typically by thermoforming the 3D entanglement of continuous thermoplastic fibers.

[0045] The hole comprises a first passage section SI, on a first portion of the hole along the axis A, in particular upper, and at least a second passage section S2, extending along the axis A, on a second portion of the hole, in particular lower.

[0046] The length of the first portion of the hole 21 along axis A may be less than or equal to the length of the second portion of the hole 21 along axis A.

[0047] Said at least a second passage section S2 is preferably wider than the first passage section, forming at least one shoulder EP between the first portion and the second portion of said hole. The passage section of the hole is understood to be the section viewed along a plane perpendicular to the axis A. Said shoulder is formed due to the difference in cross-section between the first section SI and the second section S2.

[0048] The padding system includes said removable fastening device 3, integral with the padding 2 which is configured to secure a headband to said padding.

[0049] The fastening device 3 comprises: — a first fastening part 30, in particular a clipping part comprising a deformable elastic portion, said first part configured to allow fastening of the cap, said clipping part held protruding in the groove 20 — a second attachment part 31 extending into the hole 21 comprising at least one stop wall PB configured to come into contact against said at least EP shoulder configured, during a tensile force generated by the cuff, to prevent extraction of the fixation device 3

[0050] The first fastening portion 30 is configured to extend into the groove and allow the attachment of a particular fastening element, specifically a clipping element for the cap, notably by elastic interlocking or by hooking. The first fastening portion 30 and the fastening element, configured to cooperate for their mutual attachment, may be male and female, respectively, or vice versa. According to one embodiment, the first clipping portion 30 comprises a first element El and a second element E2, extending parallel to each other, the first and second elements projecting from a base B, forming between them a hooking groove, namely "female", the first element El and the second element E2 being elastically deformable so as to allow elastic interlocking of a hooking rib of a cap into the hooking groove, which opens elastically beforehand and closes to ensure locking.

[0051] Generally, once attached to the padding, the first part of the fastening, in particular the clip, is preferably entirely housed within the groove of the padding. This avoids the risk that the fastening device, being more rigid than the padding, might be perceived as a hard point by an occupant when it rests on the padding on the side of the groove 20.

[0052] Two distinct embodiments of the padding system are illustrated in Figures 1 to 9. Generally, and as illustrated in particular for the first embodiment in [Fig.3], or for the second embodiment in [Fig.8], the padding system comprising the fastening device attached to the padding (including the first fastening part 30, and the second attachment part 31) extends mainly in the first portion of the hole with the smallest cross-section along the first section S2, but only partially over the second portion of the hole.

[0053] The padding 2 is advantageously free of a fastening device 3 over a section of the second portion of the hole, starting from the opening of the hole, on the side of the padding opposite the side of the groove. This allows free deformation of the padding when an occupant applies pressure to the padding on the side of the groove. The fastening device advantageously accommodates the deformation of the padding by compression, typically along its thickness, without risk of the rigid fastening device coming into contact with a hard surface such as a chassis component located opposite the opening of the hole, on the side of the padding opposite the side of the groove. Such untimely contact between the fastening device and the hard surface, which would cause the first portion of the fastening 30 to protrude outside the groove 20, would be perceived as a point hard by an occupant resting on the padding on that side: the present disclosure makes it possible to avoid this inconvenience.

[0054] Preferably, the free section of the fastening device from the mouth of the hole, opposite the groove, can represent at least half the length of the second portion of the hole along axis A.

[0055] Generally, said fastening device may have at least one PCB counter-stop wall configured to bear against the bottom wall of the groove 20, and such that the first portion of the padding 2 is interposed between said at least one PCB counter-stop wall and said at least one PB stop wall, along the axis A of the hole.

[0056] Said at least one stop wall PB of the second attachment part is configured to cooperate with said at least one shoulder to oppose the tensile force induced by the cap, and to prohibit the extraction of the fastening device, along the axis A of the hole, in a direction directed from the center of the hole towards the mouth on the side of the throat.

[0057] On the contrary, said counter-stop wall of the second attachment part 31 ensures the blocking of the fastening device, in the other direction, namely in the direction directed from the center of the hole towards the mouth on the side of the padding opposite to that of the groove.

[0058] According to the second embodiment, in particular illustrated in Figures 6 to 9, the second attachment part 31 may include said at least one stop wall PB, and at least one rod TG extending, from a proximal end of said at least one rod TG, projecting from said at least one stop wall PB, said rod extending through the first portion of the padding in the padding in the vicinity of the hole 21, substantially parallel to an axis A of the hole, and to a distal end of said at least one rod opening into said groove 21.

[0059] In particular, said at least one buttress wall PB may comprise a first buttress wall PB1 and a second buttress wall PB2, configured respectively to bear against a first shoulder EPI and a second shoulder EP2, extending transversely, diametrically opposite, on either side of the axis A of the hole. Said at least one rod TG comprises a first rod TGI projecting from the first buttress wall PB1 and a second rod TG2 projecting from the second buttress wall PB2.

[0060] Such a fastening device is inserted through the mouth of the hole, opposite the mouth of the hole on the side of the throat, and as visible from the arrows in [Fig.7].

[0061] The fastening device is inserted until the first fastening portion 30 of the fastening device 3 passes through the first portion of the hole and emerges from the hole 21, protruding from the groove 20 through the opening of the hole on that side, and until said at least one stop wall PB comes into contact with said at least one shoulder EP, in particular that the first buttress wall PB1 and the second buttress wall PB2 come into contact with said first shoulder EPI and the second shoulder EPI, diametrically opposite with respect to the axis of the hole.

[0062] During insertion, said at least one rod TG, in particular the first rod TGI and the second rod TG2, pass through the padding material, and in particular the fibers of the 3D entanglement of continuous thermoplastic fibers. Said at least one rod, in particular the first rod and the second rod entangled with the fibers and loops of the padding, can provide additional anchoring of the second attachment part 31 on the padding 2.

[0063] According to such an embodiment, the first coupling portion 30 has a cross-section smaller than the hole and is such that it can pass through the hole 21 along its entire length. The second attachment portion 31 has a body connecting a base, with a cross-section smaller than the hole, so as to connect the first fastening portion and said at least one abutment wall through the first portion of the hole with the smaller cross-section, and in particular to connect the fastening portion to the two abutment walls PB1, PB2 projecting laterally from the body in opposite directions. Conversely, the portion of the second attachment section 31 comprising said at least one flap, and in particular the two abutment walls PB1, PB2, has a cross-section larger than the first section SI so as to abut against said at least one shoulder EP, and in particular respectively the first and second shoulders EP1, EP2.

[0064] Generally, the fastening device may have a cross-section smaller than the second section S2 of the hole, including the second attachment part 31 comprising the two stop walls PB1, PB2, and such as to allow its insertion through the mouth of the hole on the side opposite said groove 20.

[0065] According to such an embodiment, said at least one PCB counter-stop wall can be configured as at least one removable flap VL, configured to move from a retracted position PR configured to ensure the insertion of the fastening device, from an opening of the hole on the side opposite the groove 20, to a deployed position PD for which said at least one flap VL fits onto the distal end of the rod TG, forming said at least one PCB counter-stop wall configured to bear against the bottom of the groove 20.

[0066] In particular, said at least one flap VL may include a first flap VL1, removable, configured to fit onto the distal end of the first rod TGI by forming a first counter-stop wall and a second flap VL2, removable, configured to fit onto the distal end of the second rod by forming a second counter-stop wall.

[0067] Said first buttress wall and second buttress wall are configured to bear against the bottom of the groove, on either side of hole 21. At this In effect, the flap has an opening, blind or through, inside which the distal end of said at least one rod is configured to fit together.

[0068] In the retracted position of said at least one flap, in particular in the retracted positions of the first flap VL1 and the second flap, the overall size of the first fixing part and of said at least one flap, in particular of the first flap VL1 and the second flap VL2 is less than the first section SI, allowing the passage of the flaps in retracted positions through the first section of the hole, until said at least one flap, in particular the first flap and the second flap emerge from the hole in the groove.

[0069] Generally, said at least one flap VL, is articulated to a body of the fastening device by a flexible hinge CH, and in particular a first hinge between the first flap VL1 and the body of the second fastening part, and a second hinge between the second flap VL2 and the body of the second fastening part.

[0070] The fixing device can be locked onto the padding by pivoting: - the first flap VL1, around a first hinge until a fit is obtained between the first flap and the distal end of the first rod TGI, the first flap having an orifice configured to receive said distal end, - the second flap VL2, around a second hinge until a fit is obtained between the second flap and the distal end of the second rod TG2, the second flap having an orifice configured to receive said distal end.

[0071] Generally, and according to the first embodiment illustrated in Figures 1 to 6, said at least one shoulder EP may comprise: - a first EPI shoulder arranged at a first distance L1 from the bottom of the groove 20 along a direction parallel to an axis A of the hole 21, - a second shoulder EP2 arranged at a second distance L2 from the bottom of the groove 20 along the direction parallel to the axis A of the hole 21.

[0072] As can be seen in particular in the cross-sectional view of [Fig. 3], the first shoulder EPI and the second shoulder EP2 are arranged on either side of the axis A of the hole 21, the first distance L1 being greater than the second distance L2. In other words, the first shoulder EPI is arranged along the direction of the axis A of the hole at a greater distance from the bottom of the groove 20 compared to the distance separating the bottom of the groove and the second shoulder EP2 along the same direction.

[0073] The second attachment part 31 may comprise a first leg J1 extending from the first attachment part 30 to an end end forming a first stop wall PB1 configured to contact the first shoulder EPI, and a second leg J2 extending from the first attachment part 30, the first leg being provided to an end end forming a second stop wall PB2. The first leg and the second leg may be inclined relative to axis A, the two legs diverge from the first part of fixation 30, and up to their distal end.

[0074] The first buttress wall PB1 and the second buttress wall PB2 are spaced apart, along a transverse dimension to the axis A of the hole 21, by a dimension greater than a diameter of the first passage section SI. The first buttress wall PB1 and the second buttress wall PB2 can be formed by the distal ends of the legs, the first buttress wall PB1 being formed by a wall bent relative to a wall of the first leg J1 extending along a first axis, and the second buttress wall PB2 being formed by a wall connected relative to a wall of the second leg J2 extending along a second axis. The first buttress wall PB1 and the second buttress wall PB2 can extend substantially along two parallel planes in an unconstrained rest position of the fastening device 4.

[0075] The removable fastening device 3 is configured to be put in place and fixed to the padding 2, by an insertion of the fastening device 3, at an angle to the axis A of the hole 21, and as illustrated in dotted lines in [Fig.5], and in particular an insertion of the second part of the attachment 31 into the hole 21, from the mouth of the hole in the bottom wall of the groove 21 by first inserting the first leg J1 and tilting the fastening device 3 relative to the axis A of the hole until it brings the first stop wall PB1 and the first shoulder EPI into contact.

[0076] During insertion, the first leg J1 and / or the second leg J2 are elastically deformable, so that the second stop wall PB2, inserted into the hole, comes into contact under stress with a lateral wall of the hole 21 of the first section of the hole and causes an elastic deformation of the second attachment part 30, resulting in a rapprochement of the first stop wall PB1 and the second stop wall PB2. Insertion and tilting continue until the second stop wall PB2 unfolds, securing the second shoulder EP2 when the second stop wall PB2 escapes the first portion of the hole and enters the second portion of the hole. The first stop wall PB1 and the second stop wall PB2 then elastically return to position by moving apart from each other under the elasticity of the second attachment part 31.

[0077] The two stop walls, first stop wall PB 1 and second stop wall, wedged against the first shoulder EPI and the second shoulder EP2, then oppose the extraction of the fixing device 3, during a pull on the first part of the fixing 30.

[0078] When the fastening device has a PCB backstop wall, the latter can be designed as a rigid element of the device body, and for example forming a peripheral wall extending around a base of the first The fixing part 30 is fixed to the base. This peripheral wall has a cross-section greater than the first section SI of the hole in order to bear against the bottom wall of the groove, around the mouth of the hole 21 on the side of the groove 20.

[0079] Generally, the fastening device 3, including the first fastening part 30 and the second attachment part 31, can be a single-piece plastic component, typically made of plastic, and for example, a component obtained by injection molding. The plastic of the fastening device 3 can be polyoxymethylene (POM).

[0080] The present disclosure is further to a vehicle seat assembly comprising a padding system 2 according to this disclosure, and a cover covering all or part of the padding, and fixed to the padding by a fastening element engaging, in particular by elastic interlocking with the first fastening part 30 of the fastening device 3.

[0081] The material of the padding 2 and the material of said fastening device 3 may be the same material, or two different materials but having similar physicochemical properties, in particular the same chemical composition. Advantageously, this allows the padding and the fastening device to be recycled simultaneously without separating them.

[0082] For example, the padding material 2 and the material of said fastening device 3 may be a thermoplastic polymer, in particular a thermoplastic polymer whose main chain repeating motif includes the ester function and optionally the ether function, and more particularly a thermoplastic elastomer whose main chain repeating motif includes the ester function and optionally the ether function. Therefore, this disclosure relates to a method for recycling a vehicle seat assembly according to this disclosure, wherein the padding material 2 and said fastening device 3 is a thermoplastic polymer as defined above, comprising: - optionally, separating the cover from the padding system, - grinding the padding 2 and the fastening device 3 attached to the padding, for the production of granules. - the use of the granules for the manufacture of a plastic product based on a thermoplastic polymer as defined above, in particular by molding or extrusion.

[0083] Optionally, when the cap is also made of a thermoplastic, in a material compatible with that of the padding and the fastening device, the cap is not removed and is ground simultaneously with the padding and the fastening device, further simplifying recycling.

[0084] The present disclosure further relates to a method for manufacturing a padding system according to claim 11 comprising: - / A / Obtaining a quilting by extruding a 3D tangle of continuous thermoplastic fibers arranged irregularly, forming loops welded together, - / B / Shaping of the 3D interlocking by thermoforming in order to obtain the groove 20 and the hole 21 having the first passage section SI, on a first portion of the hole, and the second passage section S2, as an extension of said first section along the axis A of the hole, on a second portion of the hole, the second passage section S2 being wider than the first passage section SI, with formation of at least one shoulder EP between the first lower portion and the second upper portion of said hole, - / C / Supply of a fastening device 2 comprising: — a first fixing part 30 comprising in particular a deformable elastic portion, configured to allow the fixing of a cap, said first fixing part 30 being held protruding in the groove 20 — a second attachment part 31 configured to extend into the hole 21 comprising at least one stop wall PB, - / D / Insertion of the fastening device into the hole so that the first part of the fastening is in position in the groove 20, protruding from the wall of the groove, and said second attachment 31 received in the hole until said at least one stop wall PB is arranged in the second portion of the hole configured to come into contact against said at least shoulder EP during a tensile force generated by the cap to prohibit extraction of the fastening device 3.

[0085] Generally, the fastening device 3 can be that of the first embodiment in particular of figures 1 to 5 which is preferably inserted from the mouth of the hole opening into the bottom of the groove, or of the second embodiment of figures 6 to 9 which is inserted through the mouth of the hole on the side opposite the groove.

[0086] According to one embodiment, in / A / , the 3D entanglement of continuous fibers is obtained by a process comprising: - / Al / Extrusion of a thermoplastic polymer in an extrusion die comprising extrusion nozzles distributed along a longitudinal direction and along a widthwise direction of the extrusion die, generating a curtain of continuous molten fibers, falling by gravity, - / A2 / Reception of the curtain of continuous fused fibers falling by gravity onto one or more support elements, generating a 3D entanglement of irregularly arranged fibers with loop fusion between the continuous fibers, - / A3 / Solidification of the 3D fiber entanglement by immersion in a coolant.

[0087] Reference is now made to [Fig. 10], which represents an example of a manufacturing process for the insert. The process involves extruding a thermoplastic polymer, in particular a thermoplastic polymer as defined above, through an FE extrusion die of the installation. The FE extrusion die may, in particular, be fed with granules of thermoplastic polymer, in particular a thermoplastic polymer as defined above, for example, from a recycling process.

[0088] The extrusion die FE comprises extrusion nozzles distributed along a lengthwise direction and a widthwise direction of the extrusion die. In / Al / , the extrusion die, starting from the thermoplastic polymer, generates a curtain RD of continuous molten fibers, falling by gravity. The curtain of continuous molten RD fibers then passes between two counter-rotating calendering elements RC1, RC2, for example in the form of rollers, generating a 3D entanglement of fibers with an irregular or random distribution, with loop fusion between the continuous fibers and a layer of total thickness determined by the center distance between said two calendering elements RC1, RC2.

[0089] In / A2 / , the two calendering elements RC1, RC2 are driven in rotation at a speed typically lower than the falling speed of the fibers, ensuring an accumulation of fibers which leads to the formation of loops which heat-weld between fibers, generating the irregular, random, three-dimensional entanglement.

[0090] Finally, the 3D fiber entanglement is solidified by immersion in a coolant (LR) to form a padding, which, after a possible cutting operation, allows for the 3D entanglement of continuous fibers. Solidification is achieved immediately after step / B2 / , with the two guide elements being immersed halfway in the coolant for this purpose.

[0091] The continuously moving 3D fiber tangle layer is then guided out of the coolant reservoir to be dried, typically by shaking / vibrating. The moving layer is then cut by cross-sections, allowing the production of different CH first layers of padding, as seen in [Fig. 10].

[0092] It is understood that the padding system may include a fastening device, or preferably several fastening devices, and in particular several fastening devices as previously described, received in several holes, distributed in parallel along the length of the same groove.

[0093] When the padding is seat padding or back padding, the padding, in particular the 3D entanglement of continuous fibers, may include a central portion (typically called a medallion for the person in the trade), intended to receive the buttocks and / or thighs of the seat occupant in the case of seat padding, and at least one lateral portion PL, in particular a right lateral portion and a left lateral portion, typically in the form of a lateral bolster, projecting from the central portion PC, said lateral portion configured to ensure lateral support of the occupant, raised relative to the central portion.

[0094] Said groove 20 may extend along the length of the padding, in excess of the depth of the central portion PC, along the lateral portion, said groove juxtaposed to the lateral portion, and in order to tighten the cover over the central portion, but also against the surface of the central portion of the padding. List of reference signs

[0095] - 1: Padding system, - 2. Matelassure, - 20. Throat, - 21. Hole, - 3. Fastening device, - 30. First part of the fastening, in particular the clipping, - 31. Second attachment part, - Day 1, Day 2. First leg and second leg, - A. Axle (hole) - SL First section of passage, - S2. Second passage section, - PB. At least one abutment wall, - PB1, PB2. First buttress wall and second buttress wall, - EP. At least one shoulder, - PPE. First shoulder, - EP2. Second shoulder, - PCB. At least one counter-button wall, - TG. At least one stem, - TGI, TG2. Respectively first stem and second stem, - LL First distance, - L2. Second distance - VL, VL1, VL2 Section, in particular first section and second section.

Claims

Demands

1. A safe mattress system (1) comprising: - a mattress (2) including a groove (20) on a surface of the mattress intended to receive an occupant, a hole (21) extending along an axis (A) deep into a bottom wall of the groove, said hole including a first passage section (S1), on a first portion of the hole, in particular the upper portion, and at least a second passage section (S2), extending along the axis of the hole, on a second portion of the hole, in particular the lower portion, said at least one second passage section being wider than the first passage section, forming at least one shoulder (EP) between the first lower portion and the second upper portion of said hole (21), - a fastening device (3), removable, integral with the mattress (2), configured to ensure the fastening of a cover to said mattress,the fastening device comprising: — a first fastening part (30) including in particular a deformable elastic portion, said first fastening part configured to allow the fastening of the cap, held protruding in the groove (20) — a second fastening part (31) extending into the hole (21) comprising at least one stop wall (PB) configured to come into contact against said at least one shoulder (EP) during a tensile force generated by the cap to prevent extraction of the fastening device (3).

2. Padding system according to claim 1, wherein said fastening device has at least one counter-stop wall (PCB), configured to bear against the bottom wall of the groove (20), and such that the first portion of the padding (2) is interposed between said at least one counter-stop wall (PCB) and said at least one stop wall (PB), along the axis (A) of the hole, in particular the counter-stop wall (PCB) forming a peripheral wall extending around a base of the first fastening part (30) in a manner integral with the base.

3. A padding system according to claim 1 or 2, wherein the second attachment part (31) comprises said at least one stop wall (PB), and at least one rod (TG) extending from a

4.

5.

6. proximal end of said at least one rod (TG), projecting from said at least one stop wall (PB), said rod extending through the first portion of the padding into the padding in the vicinity of the hole (21), substantially parallel to an axis (A) of the hole, and to a distal end of said at least one rod opening into said groove (21). Padding system according to 2 and 3, wherein said at least one counter-button wall (PCB) is configured as at least one flap (VL), removable, configured to move from a retracted position (PR) configured to ensure the insertion of the fastening device, from an opening of the hole on the side opposite the groove (20), to a deployed position (PD) for which said at least one flap (VL) fits onto the distal end of the stem (TG), forming said at least one counter-button wall (PCB) configured to bear against the bottom wall of the groove (20). A system according to claim 4, wherein said at least one stop wall (PB) comprises a first stop wall (PB1) and a second stop wall (PB2) configured respectively to bear against a first shoulder (EPI) and a second shoulder (EP2), extending transversely, diametrically opposite, on either side of the axis (A) of the hole, and wherein said at least one rod (TG) comprises a first rod (TGI) projecting from the first stop wall (PB1) and a second rod (TG2) projecting from the second stop wall (PB2), and wherein said at least one flap (VL) comprises a first flap (VL1), removable and configured to fit onto the distal end of the first rod (TGI) forming a first counter-stop wall, and a second flap (VL2), removable and configured to fit onto the distal end of the second rod forming a second wall of counter-stop,said first buttress wall and the second buttress wall configured to bear against the bottom of the groove, on either side of the hole (21). Padding system according to claim 4 or 5, wherein said at least one flap (VL), optionally the first flap (VL1) and the second flap (VL2) according to claim 5, is articulated to a body of the fastening device by a flexible hinge (CH).

7. Padding system according to claim 1 or 2 wherein said at least one shoulder (EP) comprises: - a first shoulder (EPI) arranged at a first distance (Ll) from the bottom of the groove (20) along a direction parallel to an axis (A) of the hole (21), - a second shoulder (EP2) arranged at a second distance (L2) from the bottom of the groove (20) along the direction parallel to the axis (A) of the hole, and in which the first shoulder (EPI) and the second shoulder (EP2) are arranged on either side of the axis (A) of the hole (21), the first distance (L1) being greater than the second distance (L2), and in which the second attachment part (31) comprises a first leg (J1) extending from the first fastening part (30) to a terminal end forming a first stop wall (PB1) configured to come into contact with the first shoulder (EPI), and a second leg (J2) extending from the first fastening part (30) provided to a terminal end forming a second stop wall (PB2), and in which the first stop wall (PB1) and the second stop wall (PB2) are spaced, along a transverse dimension to the axis (A) of the hole (21) of a dimension greater than a diameter of the first passage section (SI), and wherein the removable fastening device (3) is configured to be put in place and fixed to the padding (2), by inserting the fastening device (3), at an angle to the axis (A) of the hole (21), and its second attachment part (31), into the hole (21), from an opening of the hole in the bottom wall of the groove (21) by inserting the first leg (J1) and tilting the fastening device (3) relative to the axis (A) of the hole until the first stop wall (PB1) and the first shoulder (EPI) come into contact, the first leg (J1) and / or the second leg (J2) configured elastically deformable, so that the second stop wall (PB2) in contact with a lateral wall of the hole (21) of the first section of the hole,causes an elastic deformation of the second part of the attachment, resulting in a rapprochement of the first stop wall (PB1) and the second stop wall (PB2) until the second stop wall (PB2) comes to, deploy by ensuring the hooking of the second shoulder (EP2) when the first stop wall (PB 1) and the second stop wall (PB2) return elastically to position by moving away from each other.

8. Vehicle seat assembly comprising a padding system according to any one of claims 1 to 7, and a cover covering all or part of the padding, and fixed to the padding by a fastening element engaging in particular by elastic interlocking, with the first fastening part of the fastening device (3).

9. A method for manufacturing a padding system according to claim 8 comprising: - / A / Obtaining padding by extruding a 3D entanglement of irregularly arranged continuous thermoplastic fibers forming loops welded together, - / B / Shaping the 3D entanglement by thermoforming to obtain the groove (20) and the hole (21) having the first passage section (SI), on a first portion of the hole, and the second passage section (S2), extending from said first section along the axis of the hole, on a second portion of the hole, the second passage section (S2) being wider than the first passage section (SI), with the formation of at least one shoulder (EP) between the first lower portion and the second upper portion of said hole, - / C / Providing a fastening device comprising: — a first fastening portion (30) including, in particular, a deformable elastic portion,configured to allow attachment of the cap, said first attachment portion held protruding in the groove (20) — a second attachment portion (31) configured to extend into the hole (21) comprising at least one stop wall (PB), - / D / Insertion of the attachment device into the hole so that the first attachment portion is in position in the groove (20), protruding from the bottom wall of the groove, said at least one stop wall (PB) in a position in the second portion of the hole configured to come into contact against said at least one shoulder (EP) during a tensile force generated by the cap to prevent extraction of the attachment device (3).

10. A method for recycling a vehicle seat assembly according to claim 8, wherein the material of the cushion (2) and said fastening device (3) is a thermoplastic polymer whose main chain repetition pattern includes the ester function and optionally the ether function, comprising: - optionally, a separation of the cover from the cushion system, - a grinding of the cushion (2) and the fastening device (3) attached to the cushion, for the production of granules - a use of the granules for the manufacture of a plastic product based on a thermoplastic polymer whose main chain repetition pattern includes the ester function and optionally the ether function, in particular by molding or extrusion.

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