Quilting system with rotating locking fastening device

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) with clips 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: Quilting system with rotating locking fastening device

[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 of a quilting formed from a 3D entanglement of continuous fibers, arranged irregularly forming loops welded together, which is breathable, less CO2-intensive to manufacture. The fasteners typically used as inserts in polyurethane foam mattresses are not compatible with this 3D interlocking 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 including a groove on a surface of the padding intended to receive an occupant - a removable fastening device, integral with the padding, configured to secure a headband to said padding, the fastening device comprising: — a first fastening part, in particular a clipping part, including a deformable elastic portion, configured to allow the attachment of the cap, said first fastening part being held protruding in the groove — a second attachment part comprising at least a first locking wing and a second locking wing, arranged on either side of the first attachment part, and in which said fastening device is configured to be fixed to the padding by: - insertion of the fixing device into the padding, in a first insertion position in order to position the first fixing part within the groove, and the first locking wing and the second locking wing within the groove, or alternatively, insertion into a first hole and a second hole deep in a bottom wall of the groove, - locking the fastening device to the padding by rotating the fastening device around an axis of rotation, from the first insertion position to a second locking position so as to cause the first locking wing and the second locking wing to penetrate, respectively, a first housing forming a stop wall engaging with a terminal end of the first locking wing, and a second housing forming a stop wall engaging with a terminal end of the second locking wing, the engagements between the first locking wing and the second locking wing and the stop walls being configured, when of a traction force generated by the cap, to prevent extraction of the fixation 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, the first locking wing and the second locking wing of the fastening device are symmetrical with respect to the axis of rotation, the axis of rotation passing through the first part of the fastening, or even the fastening device is symmetrical with respect to the axis of rotation.

[0015] According to one embodiment, the fastening device includes a protruding stud coaxial with said axis of rotation, and the bottom of the groove of the padding includes a housing complementary to the stud, the engagement between the stud and the complementary housing ensuring centering and guidance of the fastening device relative to the padding during the rotation of the fastening device from the first insertion position to the second locking position.

[0016] According to one embodiment, the first fastening part is a clipping part comprising a first element and a second element, extending parallel between them, the first element and the second element protruding from a base forming between them a hook groove for an elastic interlocking of a hook rib of the cap, the hook groove preferably aligned with a longitudinal axis of the groove of the padding in said second locking position.

[0017] According to one embodiment, a locking system is configured to ensure that the rotation of the fastening device is locked relative to the padding in the second locking position, and comprises at least one opening in the first locking wing and / or the second locking wing, such as a first opening in the first wing and a second opening in the second wing, and at least one projecting lug on the stop wall of the first and / or the second housing, such as a first lug on the stop wall of the first housing and a second lug on the stop wall of the second housing. and wherein the locking system is configured to ensure rotational locking of the fastening device relative to the padding by engaging said lug in said at least one orifice in the second locking position.

[0018] According to one embodiment, the first locking wing and the second locking wing extend as an extension of a base of the first fixing part, in particular of the base, the first locking wing and the second wing extend along a plane of the base, perpendicular to the axis of rotation to the terminal ends of the first locking wing and the second wing, configured to penetrate the first housing and the second housing.

[0019] According to one embodiment, the first wing and the second blocking wing comprise: - the first sections of length extending diametrically opposite with respect to the base, moving away from the axis of rotation, the first sections of length following a first direction Dl, - the terminal ends, comprising a first terminal end and a second terminal end extending inclined, with respect to the first direction Dl, in opposite directions, in particular the first terminal end and the second end along a plane perpendicular to the axis of rotation and in which the fixing device is configured to allow rotation from the first insertion position to the second locking position along an angular stroke of less than 45°, for example less than 30°.

[0020] According to one embodiment, the first locking wing and the second locking wing extending from a base of the first fixing part, the first locking wing and the second locking wing respectively comprise: - first length segments extending diametrically opposite with respect to the base along a plane of the base, - second length segments extending from the first length segments, at least along one component along the direction of the axis of rotation, away from the first fixing part from the first length segments - the terminal extremities comprising a first terminal extremity and a second terminal extremity extending outwards along a second plane, perpendicular to the axis of rotation, the second plane offset from the plane of the base along the direction of the axis of rotation.

[0021] According to one embodiment, the fastening device, including the first fastening part, in particular the clip and the second attachment part, is a single-piece plastic component.

[0022] According to one embodiment, the padding comprises a 3D entanglement of continuous thermoplastic fibers arranged irregularly forming loops welded together, said throat, the first and second housings formed in said 3D entanglement of fibers, in particular at the level of the densified zone of the entanglement.

[0023] 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.

[0024] This disclosure further relates to a vehicle seat assembly comprising a padding system as described in this disclosure, in the position of the locking device and a cap covering all or part of the padding, and fixed to the padding by a fixing element, in particular a clip, which comes into contact, for example by interlocking in particular elastically with the first part of the fixing device.

[0025] 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, irregularly arranged to form loops welded together,

[0026] - / B / Shaping the 3D entanglement by thermoforming in order to obtain the gorge and a first dwelling and a second dwelling in communication with the gorge - / C / Supply of a fastening device comprising: — a first fastening part, in particular a clip including in particular a deformable elastic portion, configured to allow the fastening of the cap, — a second fastening part including a first locking wing and a second locking wing, arranged on either side of the first fastening part, - / D / insertion of the fastening device into the padding, in a first insertion position in order to position the first fastening part within the groove, and the first locking wing and the second locking wing within the groove, or else in insertion into a first hole and a second hole deep in a bottom wall of the groove (20), - / E / locking of the fixing device to the padding by rotation of the fixing device around an axis of rotation from the first insertion position to a second locking position so as to make the first locking wing and the second locking wing penetrate, respectively, into the first locking housing which forms a stop wall engaging with the first locking wing, and the second housing forming a stop wall engaging with the second locking wing, the engagements between the first locking wing and the second locking wing and the stop walls being configured, during a tensile force generated by the cap, to prohibit extraction of the fixing device.

[0027] This disclosure further relates to a recycling process for a vehicle seat assembly according to this disclosure, wherein 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

[0028] Other features, details and advantages will become apparent from reading the detailed description below and from analyzing the accompanying drawings, in which: Fig. 1

[0029] [Fig.1] is seen from a padding system, according to a first embodiment, comprising a padding and a fixing device comprising a first fixing part in a protruding clipping part of a bottom wall of a groove, and a second attachment part coming into contact with a first housing and a second housing of the padding to ensure the locking of the fixing device. Fig. 2

[0030] [Fig.2] is a view of the padding system along a cross-sectional plane perpendicular to the axis of the padding groove, illustrating the fastening device, the first part of which, in particular the clip, forms an elastic groove within the groove, the second part comprising a first locking wing and a second locking wing, extending on either side of a base of the elastic groove, the first locking wing and the second locking wing extending transversely to the padding groove, respectively in a first and a second housing of the padding, arranged on either side of the groove, the first and second locking wings configured to bear against a stop wall of the first housing and against a stop wall of the second housing respectively in order to resist, during a tensile force generated by the cap,to an extraction of the fastening device, a first lug of the stop wall of the first housing engaging with a first orifice of the first locking wing, and a second lug of the stop wall engaging with a second orifice of the second locking wing, the cross-sectional view, further illustrating a stud, projecting lower from the base of the elastic groove, coaxial with an axis of rotation of the fastening device, the stud penetrating into a complementary housing deep within the bottom of the groove. Fig. 3

[0031] [Fig.3] is a detailed perspective view of the fastening device, which may be a single-piece plastic component, the first locking wing, and the second wing blocking extending in a direction perpendicular to the axis in a plane of the base. Fig. 4

[0032] [Fig.4] is a bottom view of the fastening device, illustrating the protruding stud under the base, the block configured to ensure centering and guidance during the rotation of the fastening device. Fig. 5

[0033] [Fig.5] is a view from below of the padding on the side opposite the surface of the quilted with the groove, illustrating the first housing and the second housing, obtained by thermoforming. Fig. 6

[0034] [Fig.6] is a view of the padding along a cutting plane, perpendicular to the axis of the throat (the fastening device not shown). Fig. 7

[0035] [Fig.7] is from left to right, a succession of images of the system of padding, top view, illustrating the insertion of the fastening device, the first wing and the second wing oriented along the direction of the groove. Fig. 8

[0036] [Fig.8] is from left to right, a succession of images of the system of Top view of the padding, illustrating, from the first position of the fastening device (left), in the groove of the padding, the locking of the fastening device, obtained by rotating the fastening device a quarter turn (90°) around the axis of rotation, and up to the second locking position illustrated on the right. Fig. 9

[0037] [Fig.9] is a succession of images of the padding system, viewed from below, illustrating the rotation of the fastening device to the second locking position. Fig. 10

[0038] [Fig. 10] is: - on the left, a view of a second embodiment of the padding system, the first wing and the second blocking wing comprising first length sections extending diametrically opposite with respect to the base, away from the axis of rotation, the first length sections following a first direction Dl, and terminal ends, comprising a first terminal end and a second terminal end extending inclined with respect to the first direction Dl, in opposite directions, the first blocking wing and the second blocking wing with their inclined terminal ends forming an S shape when viewed along the axis of rotation, such a fastening device being notable in that it is configured for allow rotation from the first insertion position to the second locking position by an angular stroke much less than a quarter turn, for example less than 45°, for example less than 30° around the axis of rotation - on the right a view illustrating the angular stroke of the fixing device to go from the first insertion position to the second locking position. Fig. 11

[0039] [Fig. 11] is a view of a third embodiment of the padding system, [Fig. 11] illustrating the fastening device, the first locking wing and the second locking wing comprise respectively - the first portions of length extending diametrically opposite to the base along a plane of the base, - second length segments, extending as a continuation of the first length segments, at least along one component following the direction of the axis of rotation, moving away from the first fixing part from the first length segments - the terminal extremities comprising a first terminal extremity and a second terminal extremity extending outwards along a second plane, perpendicular to the axis of rotation, the second plane offset from the plane of the base along the direction of the axis of rotation. Fig. 12

[0040] [Fig. 12] is a top view of the fastening device according to [Fig. 11], viewed along the axis of rotation, the first wing and the second locking wing comprising first length sections extending diametrically opposite with respect to the base, away from the axis of rotation, the first length sections following a first direction Dl, and terminal ends, comprising a first terminal end and a second terminal end extending inclined with respect to the first direction Dl, in opposite directions, the first wing and the second wing, with their inclined terminal ends forming an S shape. Fig. 13

[0041] [Fig. 13] is shown in a series of three images, illustrating from left to right: - a view of the padding from the throat side, showing a first hole and a second hole at the bottom of the padding's throat, the first and second holes intended to receive respectively the first locking wing (including the second length and the first terminal end) and the second locking wing (including the second length), - a view from below, illustrating the formation of the first housing in communication with the first hole, and the second housing in communication with the second hole, the first and second housings offset on either side of the throat, transversely to the throat, - a transparent view of the first hole and the first housing, and of the second hole and the second housing. [Fig.14]

[0042] [Fig. 14] is a top view of the quilting system, illustrating three images, with from left to right: - a first view illustrating the insertion of the fastening device so as to position the first part of the fastening in the groove, and simultaneously, the first terminal end and the second portion of the length of the first locking wing in the first hole; and the second terminal end and the second portion of the second locking wing in the second hole, - a second view illustrating the fastening device in the first insertion position, - a third view illustrating the rotation ensuring the passage of the fixing device from the first insertion position to the second locking position for which the first terminal end enters the first housing and the second terminal end enters the second housing, the cooperation of the terminal ends with the stop walls of the housings preventing the extraction of the fixing device. Fig. 15

[0043] [Fig. 15] 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

[0044] 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 being configured to allow the attachment of a cover covering the padding 2, preferably under tension on the padding.

[0045] The padding may comprise a 3D entanglement of continuous thermoplastic fibers arranged irregularly, forming loops welded together, and 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. "Continuous" is understood in " continuous fibers » the fact that the fibers are much longer than the diameter of the fibers, and due to the manufacturing process, which is described below, typically by at least a ratio of 100, or even 500, or even 1000.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 interspaces between the fibers which promote air circulation, and in contrast to a molded polyurethane body, which is closer to an air-impermeable body, comparatively.

[0050] The padding may be, but not limited to, seat padding, in particular seat padding, or backrest padding, armrest padding, or any other seat padding.

[0051] The padding 2 includes a groove 20 in depth, on the surface of the side of the padding intended to receive an occupant, as well as a first housing LG1, and a second housing LG2. The first housing LG1 and the second housing LG2 can be formed by two recesses opening from a surface of the padding opposite the surface of the padding bearing the groove 20, and typically a lower surface of the padding.

[0052] The first housing LG1, and the second housing LG2 are respectively in communication with the groove 20 directly, or indirectly by a first hole T1 in the bottom of the groove 20, connecting the first housing LG1 to the groove, and by a second hole T2 in the bottom of the groove connecting the second housing LG2 to the groove 20. The first housing LG1 can be in communication with the first hole T1 by a first lateral passage Pas1, and the second housing LG2 can be in communication with the second hole T2 by a second lateral passage Pas2, and as illustrated by way of non-limiting example in [Fig.6].

[0053] Generally, and as can be understood from [Fig. 6], the groove 20 can be made from a surface of the mattress, and the first hole T1 and the second hole T1 can extend beyond the depth of the groove 20. The first hole T1 and the second hole T2 are preferably blind, i.e., not through, extending only over a portion of the mattress along the direction of the height of the groove 20. Generally, the fastening device 3 is fixed in the mattress, being positioned on an upper portion of the mattress layer, a lower portion of the mattress layer being without a fastening device 3.

[0054] This allows for free deformation of the padding when an occupant applies pressure to the padding on the side of the groove 20. The fastening device 3 advantageously accommodates the deformation of the padding by compressing it, typically along its thickness, without risk of the rigid fastening device 3 coming into contact with a hard surface, such as a chassis component, on the side of the padding opposite it to the groove. Such untimely contact between the rigid fastening device and the padding would cause the first part of the fastening 30 to protrude outside the groove 20, and would be perceived as a hard point by an occupant resting on the padding on that side. The present disclosure preferably avoids this drawback.

[0055] 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.

[0056] The padding system includes said fastening device 3, removable, integral with the padding 2 which is configured to ensure the fastening of a headgear to said padding.

[0057] The fastening device 3 comprises: — a first fixing part 30 configured to allow the fixing of the cap, said fixing part being held protruding in the groove 20 — a second attachment part 31 comprising a first locking wing 311 and a second locking wing 312, arranged on either side of the first clipping part 30. In particular the first fixing part 30 may be a clipping part comprising a deformable elastic portion.

[0058] The fastening device 3 is configured to be attached to the padding by: - insertion of the fastening device 3 into the padding, in a first insertion position PI in order to position the first fastening part 30 within the groove 20, and the first locking wing 311 and the second locking wing 312 within the groove, or preferably by insertion into the first hole T1 and the second hole T2 deep in a bottom wall groove 20 - locking the fixing device to the padding by rotating the fixing device 3 around an axis of rotation AR, from the first insertion position PI to a second locking position P2 so as to make the first locking wing 311 and the second locking wing 312 penetrate, respectively, into the first housing LG1 which includes a stop wall engaging with a terminal end of the first locking wing 311 and into the second housing LG2 which includes a stop wall engaging with a terminal end of the second locking wing 312.

[0059] The insertion step is illustrated, according to the first embodiment in [Fig. 6], and according to the third embodiment in the left-hand view. During this step, the fastening device 3 is oriented so that the direction passing through the terminal ends of the first and second wings 311, 312 is substantially aligned with a longitudinal axis of the groove 20.

[0060] During the rotation of the fastening device, the first wing and the second wing are driven into rotation around the axis of rotation, and respectively pass through the first passage Pas1 and the second passage Pas2 to insert themselves respectively into the first housing LG1 and the second housing LG2.

[0061] In the second locking position P2, the engagements between the first locking wing 311 and the second locking wing 312 and the stop walls PB are configured, during a tensile force generated by the cap, to prevent extraction of the fastening device 3. The first locking wing 311 and the second locking wing 312 bear against the two stop walls PB of the first and second housings LG1 and LG2, respectively, and via two supports extending transversely on either side of the groove. The fastening device 3 is thus locked in the extraction direction, along the direction of the axis of rotation AR. The fastening device 3 is locked in the opposite direction to the extraction direction by contact of a base B of the fastening device with the bottom of the groove, as shown in [Fig. 2], or alternatively, with the bottom of the first hole T1 or second hole T2.

[0062] Generally, once attached to the padding, the first part of the fastening, in particular the clip, is preferably entirely housed in 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.

[0063] Generally, the fastening device 3, including the first fastening part 30, in particular the clip and the second fastening part 31, can be a one-piece plastic component, typically plastic, and for example a component obtained by injection molding.

[0064] According to one embodiment, the first locking wing 311 and the second locking wing 312 of the fastening device 30 are symmetrical with respect to the axis of rotation AR, the axis of rotation AR passing through the first part of the fastening 30. Preferably, the second housing LG2 is symmetrical with respect to the first housing LG1 with respect to the axis of rotation AR, and the second hole T2 is symmetrical with respect to the first hole T1 with respect to the axis of rotation AR.

[0065] The fastening device 30 (including the first fastening part 30, in particular the clip, and said second fastening part 31) can be symmetrical with respect to the axis of rotation AR. During the insertion step, the fastening device 3 can be inserted into the groove in either of two insertion directions, namely: - a first arrangement in which the first blocking wing is directed radially to the axis of rotation in a first direction of the groove and the second wing is directed in a second opposite direction, or - a second arrangement in which the second blocking wing is directed radially, along the second direction of the groove, the first blocking wing directed along the first direction.

[0066] Generally, the fastening device 3 may include a protruding PLT stud coaxial with the axis of rotation AR, and the bottom of the groove 20 of the mattress may include a supplementary housing GC for the stud. Such an embodiment is illustrated by way of example in the figures, and in particular in the cross-sectional view which illustrates the engagement between the PLT stud and the supplementary housing GC.

[0067] The engagement between the PLT stud and the additional housing GC ensures centering and guidance of the fastening device 3 relative to the padding 2, during rotation of the fastening device, from the first insertion position PI to the second locking position P2. The axis of rotation AR, and therefore the additional housing GC, can be centered on the bottom of the groove 20, midway between two lateral walls of the groove 20, and as illustrated in [Fig. 6].

[0068] In one manner, the first fastening part 30, in particular the clipping part, may comprise a first element E1 and a second element E2, extending parallel to each other, the first and second elements projecting from a base B forming between them a gripping groove, in particular elastic, for elastic interlocking of a gripping rib of the cap. The gripping groove, in particular elastic, is preferably aligned with a longitudinal axis of the groove 20 of the padding 2 in said second locking position P2.

[0069] Generally, the padding system 1 may include several fastening devices 3, distributed and fixed to the padding along the length of the groove 20, and thus providing several first fastening parts 30, in particular The clipping mechanism features several internal, elastic gripping grooves within the groove, with the first clip sections spaced according to the groove's length. Orienting the elastic groove along the groove's axis (at least locally) advantageously allows for elastic engagement of the same gripping rib within the different gripping grooves.

[0070] According to one embodiment, the padding system 1 may include a locking system configured to ensure that the rotation of the fastening device 3 is locked relative to the padding 2 in the second locking position P2. Such a locking system is configured to prevent accidental disassembly of the fastening device 3.

[0071] The locking system may include at least one orifice of the first locking wing 311 and / or the second locking wing 312, such as a first orifice 01 of the first locking wing 311 and a second orifice 02 of the second locking wing 312, and at least one protruding lug of the stop wall PB of the first housing LG1 and / or the second housing LG2, such as a first lug EG1 of the stop wall PB of the first housing LG1 and / or a second lug EG2 of the stop wall of the second housing LG2.

[0072] The locking system is configured to ensure rotational locking of the fastening device 3 relative to the padding 2, by engaging said lug in said at least one orifice in the second locking position P2, and in particular the first lug LG1 in the first orifice 01, and the second lug LG2 in the second orifice 02.

[0073] During rotation from the first insertion position PI to the second locking position P2, said at least one lug, in particular the first lug EG1 and the second lug EG2, the locking wings 311, 312 cooperate elastically with the lugs EG1, EG3, before entering said at least one orifice, in particular the first orifice 01 and the second orifice 02 in order to lock the rotation of the fixing device 3.

[0074] The angular travel of the fixing device 3 from the first insertion position PI to the second insertion position P2 can typically be between 10° and 90° around the axis of rotation AR. The angular travel can be a quarter turn, i.e., 90° around the axis of rotation AR, and, for example, illustrated according to a first embodiment in Figures 1 to 8.

[0075] According to such an embodiment, the first locking wing 311 and the second locking wing 312 extend along a longitudinal direction in a plane of the base B of the first fastening part, in particular from the two terminal ends of the first locking wing 311 and the second locking wing 312, and for example along a direction orthogonal to the direction of the gripping groove. Such The orientation of the hook groove relative to the locking wings 311, 312 allows the hook groove of the first fixing part 30 to be aligned with the groove, in the second locking position P2, after a quarter turn rotation.

[0076] According to other embodiments of the fastening device 3, for example illustrated in Figures 9 to 14, the geometry of the first locking wing 311 and the second locking 312 can be configured to ensure a limited angular travel a between the first insertion position PI and the second locking position P2 around the axis of rotation AR, much less than 90°, and in particular less than 45°, or even less than 30°

[0077] To this end, as illustrated in the embodiment of [Fig. 10], or that of [Fig. 12], the first wing 311 and the second blocking wing 312 may comprise: - the first sections of length SL1 extending diametrically opposite with respect to the base, moving away from the axis of rotation AR, the first sections of length following a first direction Dl, - the terminal ends ET, comprising a first terminal end EAT1 and a second terminal end ET2 extending inclined relative to the first direction Dl, in opposite directions. When the angular stroke is of value a, the inclination between the longitudinal direction of the first terminal end ET1 and the direction Dl can typically be an angle of 90° - a, and the inclination between the direction of the second terminal end ET2 and the direction D can typically be an angle of 90° - a.

[0078] As seen in [Fig. 10] or [Fig. 12], the first blocking wing and the second blocking wing (with their terminal ends inclined) form an S shape when viewed along the AR axis of rotation.

[0079] Thus the fixing device is configured to allow rotation from the first insertion position PI to the second locking position P2 along an angular stroke a less than 45°, for example less than 30°.

[0080] In the second locking position P2, as illustrated in particular in the image on the right in [Fig. 14], the first terminal end ET1 and the second terminal end ET2 extend in length substantially orthogonally to the direction of the groove, to penetrate the first housing LG1 and the second housing LG2, on either side of the groove 20.

[0081] According to an embodiment in [Fig.1] and 2, or in [Fig.9], the first locking wing 311 and the second locking wing 312 extend in a plane of the base B of the first fixing part 30, and so that the stop walls of the first housing LG1 and the second housing LG2 are level with the bottom of the groove.

[0082] According to another embodiment of Figures 11 to 14, the first locking wing 311 and the second locking wing 312 extending from a base B of the first fixing part, may respectively comprise: - the first portions of length PR1 extending diametrically opposite to the base along a plane of the base B, - second length segments PR2, extending from the first length segments, extending at least one component along the direction of the axis of rotation AR, away from the first fixing part 30 from the first length segments PR1 - the terminal ends ET comprising a first terminal end ET1 and a second terminal end ET2 extending outwards along a second plane, perpendicular to the axis of rotation AR, the second plane offset from the plane of the base B along the direction of the axis of rotation.

[0083] In the first insertion position PI of the fastening device 3, the first length portions PR1 belonging to the first locking wing 311 and the second locking wing 312 are housed in the groove 20, while the second length portions PR2 belonging respectively to the first locking wing 311 and the second locking wing 312 are housed in the first hole T1 and in the second hole T2.

[0084] The first terminal end ET1, at the distal end of the first portion of length PR1 is thus deep from the first hole T1, at a distance from the bottom of the throat and the second terminal end ET2, at the distal end of the second portion of length PR2 is thus deep from the second hole T2, at a distance from the bottom of the throat 20.

[0085] Such an embodiment allows the end ends ET1 and ET2 to engage with the abutment walls PB of the first housing LG1 and the second housing LG2, at a depth greater than the bottom of the groove, for example by a distance along the direction of the axis of rotation of one centimeter, or even more, from the bottom of the groove 20. The distance between the plane of the base B and the second plane containing the end ends can be greater than the depth dimension of the groove, or even greater than a multiple (2, 3...) of the depth of the groove 20. Such an offset of the end ends ET1, ET2 along the second plane relative to the plane of the base allows the end ends ET to bear on a portion of the padding above the abutment walls, which is thicker than in the first embodiment, and in particular to increase the pull-out resistance.

[0086] This disclosure further relates to a vehicle seat assembly comprising a padding system 2 according to this disclosure, and a headrest covering all or part of the mattress, and fixed to the padding by an element in particular of clipping which is fixed, in particular by elastic interlocking, with the first part of fixing, in particular of clipping of the fixing device 3 fixed to the padding.

[0087] 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.

[0088] 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 pattern includes the ester function and possibly the ether function, most particularly a thermoplastic elastomer whose main chain repeating pattern includes the ester function and possibly the ether function.Therefore, this disclosure relates to a recycling process for a vehicle seat assembly according to this disclosure, wherein the material of the padding 2 and said fastening device 3 is a thermoplastic polymer as defined above, comprising: - optionally, separation of the cover from the padding system, - grinding of the padding 2 and the fastening device 3 attached to the padding, for the production of granules - 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.

[0089] 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.

[0090] 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 a groove 20 and a first housing LG1 and a second housing LG2 in communication with the groove 20, or even a first hole T1 connecting the groove and the first housing LG1, and a second hole T2 connecting the groove and the second housing LG2 - / C / Supply of a fastening device comprising: — a first fastening part 30, (in particular a clip including a deformable elastic portion) configured to allow the fastening of the cap, — a second attachment part 31 comprising a first locking wing 311 and a second locking wing 312, arranged on either side of the first attachment part 30, - / D / insertion of the fastening device 3 into the padding, in a first insertion position PI in order to position the first part of the fastening 30 within the groove 20, and the first locking wing 311 and the second locking wing 312 within the groove, or alternatively in insertion into a first hole T1 and a second hole T2 deep in a bottom wall of the groove 20, / E / locking of the fastening device to the padding by rotation of the fastening device 3 around an axis of rotation AR, from the first insertion position PI to a second locking position P2 so as to cause the first locking wing 311 and the second locking wing 312 to penetrate, respectively, into the first locking housing LG1 which forms a stop wall engaging with the first locking wing 311, and the second housing LG2 forming a stop wall engaging with the second locking wing 312,the engagements between the first locking wing 311 and the second locking wing 312 and the configured stop walls, during a tensile force generated by the cap, to prevent extraction of the fastening device 3. ,

[0091] 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.

[0092] Reference is now made to [Fig. 15], which represents an example of a method for manufacturing the insert. The method comprises 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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].

[0097] The 3D fiber entanglement layer can be shaped in particular by thermoforming to form the groove 20, or even the first hole T1, and the second T2 from the side of the padding receiving the seat occupant, the first hole T1 and the second hole T2 opening from the bottom of the groove 20. The additional housing intended to cooperate with the PLT stud can be thermoformed during the formation of the groove 20.

[0098] The first housing LG1 and the second housing LG2 can be thermoformed from a second side of the padding opposite to the side carrying the groove, by means of non-through recesses opening from this second side. The first lug EG1 and the second lug EG2 can be thermoformed simultaneously. A first pass Pas1 is created between the first housing LG1 and the first hole T, and a second pass Pas2 is created between the second housing LG2 and the second hole T2. The thermoforming of the first housing LG1 and the second housing LG2 allows in particular to densify the 3D entanglement of thermoplastic fibers, and in particular at the level of the PB stop walls intended to retain the first blocking wing 311 and the second blocking wing 312.

[0099] It is understood that the padding system may include a fastening device 3, or preferably several fastening devices, and in particular several fastening devices as previously described, distributed along the length of the same groove.

[0100] When the padding is a seat padding or a backrest padding, the padding, in particular the 3D entanglement of continuous fibers, may include a central part (typically called a medallion for the person skilled in the art), intended to receive the buttocks and / or thighs of the seat occupant in the case of a seat padding, and at least one lateral part PL, in particular a right lateral part and a left lateral part, typically in the form of a lateral roll, projecting from the central part PC, said lateral part configured to ensure the lateral support of the occupant, raised from the central part.

[0101] Said groove 20 can extend along the length of the padding, in depth of the central part PC, along the lateral part, said groove 20 juxtaposed to the lateral part, and in order to stretch the cover over the central part, but also against the surface of the central part of the padding. List of reference signs

[0102] - 1: Padding system, - 2. Matelassure, - 20. Throat, - Tl, T2 first hole and second hole, - 3. Fastening device, - 30. First part of the fastening, in particular the clips, - E1, E2. First element and second elastic element forming a hooking groove - 31. Second attachment part, - 311. First blocking wing, - 312. Second blocking wing, - AND, AND1, AND2. Terminal extremities, in particular the first terminal extremity and the second terminal extremity, - 01. First opening, - 02. Second opening, - AR. Axis of rotation, - SL1. First length sections, - Dl. First direction, - B. Base, - PLT. Plot (centering and guidance), - GC. Additional housing (plot) - PRL First portions of length (extending in the plane of the base), - PR2. Second length sections; - PC. Central portion (padding), - PL. Lateral portion (padding). - Pasl, Pas2. First pass and second pass

Claims

1. Demands Safe mattress system (1) comprising: - a padding (2) comprising a groove (20) on a surface of the padding intended to receive an occupant - a removable fastening device (3), integral with the padding (2), configured to secure a headband to said padding, the fastening device comprising: — a first fixing part (30), in particular a clipping part comprising in particular a deformable elastic portion, configured to allow the fixing of the cap, said first fixing part, being held protruding in the groove (20) — a second attachment part (31) comprising at least a first locking wing (311) and a second locking wing (312), arranged on either side of the first attachment part (30), and wherein said fastening device (3) is configured to be fixed to the padding by: - insertion of the fastening device (3) into the padding, in a first insertion position (PI) in order to position the first part of the fastening (30) within the groove (20), and the first locking wing (311) and the second locking wing (312) within the groove, or alternatively by insertion into a first hole (T1) and a second hole (T2) deep in a bottom wall of the groove (20), - locking of the fastening device to the padding by rotation of the fastening device (3) around an axis of rotation (AR), from the first insertion position (PI) to a second locking position (P2) so as to make the first locking wing (311) and the second locking wing (312), respectively, penetrate into a first housing (LG1) forming a stop wall engaging with a terminal end of the first locking wing (311),and a second housing (LG2) forming a stop wall engaged with a terminal end of the second locking wing (312), the engagements between the first locking wing (311) and the second locking wing (312) and the stop walls being configured, during a tensile force generated by the cap, to prevent extraction of the fastening device (3).

2. Padding system (1) according to claim 1, wherein the fastening device (3) comprises a protruding stud (PLT) coaxial with said axis of rotation (AR), and the bottom of the groove (20) of the padding comprises a complementary housing (GC) to the stud, the engagement between the stud (PLT) and the complementary housing (GC) ensuring centering and guidance of the fastening device (3) relative to the padding (2) during rotation of the fastening device from the first insertion position (PI) to the second locking position (P2).

3. Padding system according to any one of claims 1 or 2, wherein the first fastening part (30) is a clipping part comprising a first element (E1) and a second element (E2), extending parallel between them, the first element and the second element projecting from a base (B) forming between them a hook groove for elastic interlocking of a hook rib of the cap, the hook groove aligned with a longitudinal axis of the groove (20) of the padding (2) in said second locking position (P2).

4. Padding system according to any one of claims 1 to 3, comprising a locking system configured to ensure locking of the rotation of the fastening device (3) relative to the padding (2) in the second locking position (P2), and comprising at least one opening in the first locking wing (311) and / or the second locking wing (312) such as a first opening (01) in the first wing (311) and a second opening (02) in the second wing (312), and at least one projecting lug in the stop wall of the first housing (LG1) and / or the second housing,such as a first lug (EG1) of the stop wall of the first housing (LG1) and a second lug (EG2) of the stop wall of the second housing (LG2) and wherein the locking system is configured to ensure rotational locking of the fastening device (3) relative to the padding by engaging said lug in said at least one orifice in the second locking position (P2).

5. A padding system according to any one of claims 1 to 4, wherein the first locking wing (311) and the second locking wing (312) extend as a continuation of a base (B) of the first fastening part, in particular of the base (B) according to the system of claim 4, the first blocking wing (311) and the second wing (312) extending along a plane of the base, perpendicular to the axis of rotation (AR) to the terminal ends (ET) of the first blocking wing (311) and the second wing (312), configured to penetrate the first housing (LG1) and the second housing (LG2).

6. A padding system according to any one of claims 1 to 4, in the first wing (311) and the second locking wing (312) extending from a base (B) of the first fastening part (30), in particular the base (B) according to the system of claim 4, comprises: - first length sections (SL1) extending diametrically opposite to the base, away from the axis of rotation (AR), the first length sections along a first direction D1, - the end ends (ET), comprising a first end end (EAT1) and a second end end (ET2) extending inclined with respect to the first direction D1, in opposite directions, and wherein the fastening device is configured to allow rotation from the first insertion position (PI) to the second locking position (P2) through an angular stroke (a) of less than 45°, for example less at 30°.

7. A padding system according to any one of claims 1 to 4 and 6, wherein the first locking wing (311) and the second locking wing (312) extend from a base (B) of the first fastening part (30), in particular the base (B) according to the system of claim 3 or 6, the first locking wing (311) and the second locking wing (312) respectively comprise: - first length portions (PR1) extending diametrically opposite to the base along a plane of the base (B), - second length portions (PR2) extending from the first length portions, at least along a component along the direction of the axis of rotation (AR), away from the first fastening part (30) from the first length portions - the terminal ends (ET) comprising a first terminal end (ET1) and a second terminal end (ET2) extending outwards along a second plane, perpendicular to the axis of rotation (AR), the second plane offset from the plane of the base (B) along the direction of the axis of rotation.

8. Vehicle seat assembly comprising a padding system according to any one of claims 1 to 7, in the locking position (P2) of the fastening device and a cover covering all or part of the padding, and fixed to the padding by a fastening element, in particular a clip, engaging, for example by interlocking in particular elastic interlocking, with the first fastening part (30) of the fastening device (3).

9. A method for manufacturing a padding system according to any one of claims 1 to 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 a first housing (LG1) and a second housing (LG2) communicating with the groove (20), - / C / Providing a fastening device comprising: — a first fastening part (30), in particular a clip comprising, in particular, a deformable elastic portion, configured to allow fastening of the headgear, — a second fastening part (31) comprising a first locking wing (311) and a second locking wing (312), arranged on either side of the first fastening part (30), - / D / Insertion of the fastening device (3) into the padding,in a first insertion position (PI) in order to position the first fastening part (30) within the groove (20), and the first locking wing (311) and the second locking wing (312) within the groove, or alternatively inserted into a first hole (T1) and a second hole (T2) deep in a bottom wall of the groove (20), - / E / locking the fastening device to the padding by rotating the fastening device (3) around an axis of rotation (AR), from the first insertion position (PI) to a second locking position (P2) so as to make the first locking wing (311) and the second locking wing (312), respectively, penetrate the, first locking housing (LG1) which forms a stop wall engaging with the first locking wing (311), and the second housing (LG2) which forms a stop wall engaging with the second locking wing (312), the engagements between the first locking wing (311) and the second locking wing (312) and the stop walls being configured, during a tensile force generated by the cap, to prohibit extraction of the fastening 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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