Vehicle seat backrest and associated manufacturing method

Abstract

The invention provides a vehicle seat backrest (3) comprising a main body (10), a cover layer (12) designed to be placed on the back of the main body (10) and to cover at least a portion of the main body (10), a storage device (14) defining a storage volume on a portion of the cover layer (12), and an attachment system (16) for attaching the storage device (14) to the cover layer (12), wherein the attachment system (16) comprises at least one fixing support and at least one pin, the cover layer (12) being overmoulded on the at least one fixing support, the at least one pin cooperating with the at least one fixing support and the storage device (14) to attach the storage device (14) to the cover layer (12).

Description

Technical Field

[0001] The present invention relates to a backrest of a vehicle seat, comprising a body, a cover layer designed to be placed on the back of the body and cover at least a portion of the body, and a storage device attached to the cover layer and defining a storage volume on a portion of the cover layer. Background Technology

[0002] Storage devices, for example, are wallets attached to the rear surface of the seat back so that passengers behind the seat, including the seat back, can use them.

[0003] It is known from the current state of the technology that a storage device is attached to a cover layer by piercing a hole in the cover layer and inserting a means for attaching the storage device into the hole.

[0004] However, punctures in the capping layer compromise its integrity, creating weak areas. The capping layer is therefore more susceptible to degradation, especially near the puncture site.

[0005] In addition, punctures may damage the coating and render it unusable.

[0006] Finally, the piercing holes in the cover layer must be performed according to the size and location of the attachments installed on the storage device. Therefore, piercing is a high-precision operation, which makes the production of the seat back more complex. Summary of the Invention

[0007] One object of the present invention is to overcome these disadvantages by providing a seat back in which storage devices are securely attached in a simple manner, while also maintaining the integrity of the cover.

[0008] Therefore, the present invention relates to a backrest of a vehicle seat, comprising a main body, a cover layer designed to be placed on the back of the main body and covering at least a portion of the main body, a storage device defining a storage volume on a portion of the cover layer, and a fixing device for attaching the storage device to the cover layer, the fixing device including at least one fixing support and at least one pin, the cover layer being overmolded on the at least one fixing support, the at least one pin cooperating with the at least one fixing support and the storage device to attach the storage device to the cover layer.

[0009] Because the cover layer is overmolded, the holes are formed at the locations where the fixing supports will be inserted, and there is no need to perforate the cover layer manufactured upstream to form the holes. This avoids the risk of damaging the cover layer.

[0010] Furthermore, the manufacturing of the seat back is simplified due to the present invention, as the resulting finished cover does not require subsequent piercing operations.

[0011] Moreover, the positioning of the fixed support is precise and can be easily adapted to the positioning of the attachment device of the storage device.

[0012] Furthermore, the fixed support increases the stiffness of the attachment on the cover layer. This attachment is provided by the engagement between the pin and the fixed support; the cover layer is not directly stressed, which reduces wear on the layer.

[0013] Other optional features of the invention, considered individually or in any technically feasible combination:

[0014] The covering layer includes polyurethane and / or plastic;

[0015] The cover layer has at least one through hole with an edge, and the at least one fixing support is a ring extending about an axis into the at least one through hole. The ring includes an inner circumferential facet and an outer circumferential facet, the inner circumferential facet defining an attachment hole, the at least one pin extending in the attachment hole, and the outer circumferential facet extending radially opposite to the inner circumferential facet and abutting against the edge of the corresponding through hole.

[0016] The covering layer includes a structural layer and a finishing layer. The structural layer includes an inner surface facing the body and an outer surface opposite to the inner surface. The finishing layer has an inner surface extending over at least a portion of the outer surface of the structural layer and an outer surface opposite to the inner surface of the finishing layer. An attachment hole extends from the inner surface of the structural layer to the outer surface of the finishing layer.

[0017] The finishing layer includes a coating layer and a non-porous anhydrous polyurethane surface layer. The coating layer is formed by applying coating to the forming surface of the forming tool. The surface layer is applied on the coating layer in the forming tool. The structural layer is made of foam and is formed by applying foam on the surface layer in the forming tool.

[0018] The storage device includes a sheet and a frame surrounding the sheet, the sheet being attached to the frame, at least one pin engaging with the frame, and a storage volume extending between a cover layer and the sheet.

[0019] The ring also includes an inner transverse face facing the body and an outer transverse face opposite to the inner transverse face, the inner transverse face and the outer transverse face connecting the inner circumferential face and the outer circumferential face, each pin including a base and two feet extending from the base parallel to the axis, the two feet abutting against the inner circumferential face of the ring, the two feet defining a receiving space for receiving the frame between them.

[0020] Each foot of the at least one pin includes a retaining protrusion extending into a receiving space, and the frame is held in the receiving space between the base of the pin and the retaining protrusion;

[0021] The base of the at least one pin extends opposite to the outer transverse portion of the ring, each foot includes an end extending towards the inner transverse portion of the ring, each foot including a stop extending radially away from the axis relative to the axis at its end, each stop abutting against the inner transverse portion of the ring; and

[0022] The fixing device also includes a cover covering the at least one pin, the cover including a main wall extending in a plane substantially perpendicular to the axis, and two side walls extending from the main wall toward a fixing support to a support end, the support end abutting against a sheet such that the sheet is clamped between the support end and the outer transverse face of the ring, each side wall including a protrusion extending radially toward the axis, the base of the at least one pin including a support surface facing the outer transverse face of the ring, the support surface abutting against each protrusion of the side wall such that the at least one pin is held in place along the axis.

[0023] The present invention also relates to a vehicle seat, which includes a seat cushion, a seat back as described above, and a seat headrest.

[0024] The present invention also relates to a method for manufacturing a vehicle seat back, comprising the following steps:

[0025] The system provides a main body, a storage device, and a fixing device for attaching the storage device to the cover of a seat, the fixing device including at least one fixing support and at least one pin;

[0026] A molded covering layer is applied to at least one fixed support member;

[0027] The cover layer is placed on the back of the main body, covering at least a portion of the main body; and

[0028] The at least one pin is configured such that it engages with the at least one fixing support and the storage device to attach the storage device to the cover layer.

[0029] According to another optional feature of the method, the at least one fixing support is a ring, and covering the at least one fixing support with a molded covering layer includes the following steps:

[0030] A forming tool is provided, the forming tool including a first forming surface having an outer surface of a cover layer and an imprint of an attachment hole, at least one pin being designed to extend in the attachment hole;

[0031] The ring is positioned around the imprint and against the first forming surface;

[0032] A finishing layer is formed on the first forming surface; and

[0033] Apply a structural layer to the inner surface of the finish layer. Attached Figure Description

[0034] Other aspects and advantages of the invention will become apparent upon reading the following description, given by way of example only and with reference to the accompanying drawings, in which:

[0035] Figure 1 This is a schematic diagram of the rear view of a vehicle seat back according to the present invention;

[0036] Figure 2 yes Figure 1 The seat back is based on Figure 1 A schematic diagram of a partial sectional view of section II-II shows a system for attaching storage devices to a cover layer;

[0037] Figure 3 yes Figure 2 A cross-sectional view of the backrest cover;

[0038] Figure 4 It corresponds to Figure 2 Box IV shown Figure 2 Enlarged image;

[0039] Figure 5 This is a schematic cross-sectional view of a forming tool used to manufacture a seat back, showing the steps involved in forming the finishing layer of the overlay; and

[0040] Figure 6 yes Figure 5 A schematic cross-sectional view of the forming tool shows the steps of applying the structural layer to the inner surface of the finishing layer. Detailed Implementation

[0041] Reference Figure 1 This describes a vehicle seat 1. Seat 1 is, for example, a seat in a land vehicle, a sea vehicle, or an air vehicle. Seat 1 is, for example, a motor vehicle seat.

[0042] Seat 1 is designed to receive the user of Seat 1.

[0043] In the following text, the terms "front" and "back" are defined for the user of seat 1. "Front" corresponds to the direction the user is facing when sitting in seat 1. "Back" corresponds to the direction opposite to the direction the user is facing when sitting in seat 1.

[0044] Seat 1 includes seat cushion 2, seat back 3 and seat headrest 4.

[0045] The seat cushion 2 and headrest 4 of seat 1 are, for example, conventional ones, and will not be described in detail here.

[0046] Reference Figure 2 and Figure 3The backrest 3 of the seat 1 includes a main body 10, a cover 12, a storage device 14, and a fixing device 16 for attaching the storage device 14 to the cover 12. The main body 10 also includes, for example, in... Figure 2 The visible covering 11.

[0047] The main body 10 of the backrest 3 provides support for the user of the seat 1. The main body 10 shapes the backrest 3 and includes a front section 8 shaped to receive the user of the seat 1, and a rear section 9 opposite the front section 8. Specifically, when the user uses the seat 1, the user leans against the main body 10, particularly against the front section 8 of the main body 10. Figure 2 As shown, the main body 10 includes, for example, a filler 17 and an internal frame 18 on which the filler 17 is mounted.

[0048] The filling 17 is formed of foam, preferably polyurethane foam. Advantageously, when the user uses the seat 1, the user leans against the filling 17.

[0049] The internal frame 18 is attached, for example, to the floor of the vehicle. Therefore, it connects the infill 17 to the floor of the vehicle.

[0050] Covering 11 is made of, for example, leather, fabric, or synthetic materials. Figure 2 As shown in the example, the cover 11 covers at least a portion of the front face 8 of the body 10. The cover 11 gives its appearance to the front of the backrest 3. The cover 11 also helps, for example, to protect the body 10.

[0051] The cover layer 12 is designed to be placed on the back of the body 10 and cover at least a portion of the body 10. Specifically, as... Figure 2 As shown, the cover layer 12 is placed on the back of the body 10 and covers at least a portion of the rear face 9 of the body 10. The cover layer 12 thus gives its appearance to the back of the backrest 3. The cover layer 12 also helps to, for example, protect the body 10.

[0052] like Figure 2 As shown, the cover layer 12 is held close to the body 10, for example, by at least one mechanical connector 19 connected to the cover 11. Therefore, the cover 11 and the cover layer 12 are part of the assembly surrounding the body 10. The at least one mechanical connector 19 is, for example, a zipper or a sewn-on contour connector.

[0053] According to one variation, the cover layer 12 is attached to the inner frame 18 of the body 10 by at least one clip (not shown).

[0054] The cover layer 12 may include, for example, polyurethane and / or plastic.

[0055] like Figure 3 and Figure 4 As shown, the cover layer 12 includes, for example, a structural layer 20 and a finishing layer 22, and has at least one through-hole 24 (in Figure 4 (See below). The cover layer 12 includes, for example, a plurality of through holes 24. For the sake of brevity, only one through hole 24 will be described below.

[0056] The covering layer 12 includes an inner surface 26 facing the body 10 and an outer surface 28 opposite to the inner surface 26.

[0057] The cover layer 12 is thin. The term "thin" means that the cover layer 12 extends in three dimensions, one of which (corresponding to the thickness E of the cover layer, i.e., the distance between the inner surface 26 and the outer surface 28 of the cover layer 12) is much smaller than the other two dimensions (corresponding to the width and length of the cover layer 12). The thickness E of the cover layer 12 is, for example, between 0.8 mm and 50 mm, preferably between 0.8 and 15 mm. The length / thickness ratio and the width / thickness ratio are, for example, between 15 and 1,250. Furthermore, the average size of the body 10 is, for example, between 200 mm and 1,000 mm. Therefore, the cover layer 12 is also considered thin compared to the body 10 it covers.

[0058] In addition, such as Figure 4 As shown, the cover layer 12 is formed onto at least one fixing support 40 of the fixing device 16. The cover layer 12 is, for example, overmolded onto multiple fixing supports 40. Thus, the cover layer surrounds and holds the fixing supports 40(s). The fixing supports 40(s) are then rigidly attached to the cover layer 12 by overmolding.

[0059] like Figure 4 As shown, the through hole 24 extends from the inner surface 26 of the cover layer 12 to the outer surface 28.

[0060] The through hole 24 has an edge 60 that defines the through hole 24.

[0061] As will be described below, the through hole 24 is configured to receive at least a portion of the fixing device 16.

[0062] Reference Figure 3 and Figure 4 The structural layer 20 includes an inner portion 48 and an outer portion 50. The inner portion 48 of the structural layer 20 faces the body 10, and the outer portion 50 of the structural layer 20 is opposite to the inner portion 48. The inner portion 48 of the structural layer 20, for example, takes the shape of the body 10 and extends above the body 10.

[0063] The structural layer 20 has a thickness E1 corresponding to the distance between its inner surface 48 and its outer surface 50. The thickness E1 of the structural layer 20 is, for example, between 0.5 mm and 50 mm, preferably between 0.5 mm and 15 mm.

[0064] The structural layer 20 is made of foam, for example, polyurethane (PU) foam, particularly foam having a formulation containing water and an optional foaming catalyst when applied to the finishing layer 22.

[0065] Structural layer 20 has a hardness between 10 and 100 Shore A, as measured according to ISO 868 standard.

[0066] The stiffness of structural layer 20 is between 5N and 50N for a 30mm deflection, which is applied by a semi-cylindrical punch at the center of a 240mm×40mm×9mm test piece, the two ends of which rest on supports 150mm apart on support surfaces.

[0067] Due to these stiffness and hardness values, the structural layer 20 has sufficient stiffness and hardness to support the finishing layer 22 and cooperate with the fastening device 16.

[0068] Reference Figure 3 and Figure 4 The finishing layer 22 includes an inner surface 54 and an outer surface 56. The inner surface 54 of the finishing layer 22 extends over at least a portion of the outer surface 50 of the structural layer 20. The outer surface 56 of the finishing layer 22 is opposite to the inner surface 54 of the finishing layer 22.

[0069] The finishing layer 22 has a thickness E2 corresponding to the distance between its inner surface 54 and its outer surface 56. The thickness E2 of the finishing layer 22 is, for example, between 0.5 mm and 3 mm. The thickness E2 is measured under dry conditions.

[0070] like Figure 3 As shown, the finishing layer 22 includes, for example, a coating layer 57 and a surface layer 58.

[0071] As will be described in more detail below, coating layer 57 is formed by applying coating to the forming surface of the forming tool. In particular, the coating is sprayed onto the forming surface. The coating is, for example, a one-component coating or a two-component coating comprising a "resin" and a "hardener" mixed before application.

[0072] The surface layer 58 is made of, for example, a non-porous, anhydrous polyurethane. As will be described in more detail below, the surface layer 58 is applied onto the coating layer 57 in a forming tool. In particular, the polyurethane designed to form the surface layer 58 is sprayed onto the coating layer 57 in a liquid state. The surface layer 58, for example, readily adheres to the coating layer 57.

[0073] When the surface layer 58 is applied to the structural layer 20, the surface layer 58 adheres easily to the structural layer 20. In particular, as will be described in more detail below, the structural layer 20 is formed by applying foam to the polyurethane surface layer 58 in a forming tool.

[0074] like Figure 4 As shown, the storage device 14 defines a storage volume over a portion of the cover layer 12. The storage device 14 includes, for example, a sheet 32 ​​and a frame 34 surrounding the sheet 32. The storage volume extends between the cover layer 12 and the sheet 32, particularly between the finishing layer 22 and the sheet 32. The storage device 14 is used to receive one or more objects that passengers of a vehicle wish to store within the storage volume. The objects are held within the storage volume between the sheet 32 ​​and the cover layer 12.

[0075] Optionally, such as Figure 1 As shown in the example, the storage device 14 includes an elastic strip 36 at the top, which is designed to return the sheet 32 ​​toward the cover layer 12.

[0076] like Figure 1 As shown in the example, sheet 32 ​​is, for example, a mesh forming a pocket. The mesh is, for example, made of fabric or polymer. Sheet 32 ​​is attached to frame 34. Sheet 32 ​​has multiple meshes, each of which is attached to frame 34, for example, by knotting around frame 34. Sheet 32 ​​is, for example, elastically deformable. In particular, it is designed to deform at least partially during the insertion of an object into the storage volume. For example, the sheet 32 ​​returns to its initial shape by the action of elastic strips 36.

[0077] In one variation, sheet 32 ​​is a continuous layer of leather, textile or non-textile fabric or polymer.

[0078] Reference Figure 4 The frame 34 forms a rigid support for the sheet 32. The frame 34 includes cylindrical rods 64, for example, the cylindrical rods 64 being curved. The cylindrical rods 64 extend, for example, along a U-shaped trajectory, and the sheet 32 ​​extends between two branches of the U-shape. (See reference...) Figure 1 and Figure 4 Optionally, the cylindrical rod 64 extends partially along the extending direction D below the cover 44 of the fixing device 16. Therefore, the frame 34 is covered by the cover 44, making the frame 34 invisible from the outside of the backrest 3. The rod 64 is, for example, a steel rod.

[0079] As will be described below, the frame 34 is held in at least one receiving space 102 defined by at least one pin 42 of the fixing device 16. In particular, the rod 64 of the frame 34 is held in the receiving space 102.

[0080] The fixing device 16 includes at least one fixing support 40, at least one pin 42, and an optional cover 44. The fixing device 16 is configured to attach the storage device 14 to the cover layer 12. The fixing device 16 may include, for example, a plurality of fixing supports 40 and a plurality of pins 42. The number of pins 42 equals the number of fixing supports 40, and the number of fixing supports 40 equals the number of through holes 24. For brevity, only one fixing support 40 and one pin 42 will be described below.

[0081] The fixing support 40 is, for example, a ring 68 extending into the through hole 24 around axis A-A'. The ring 68 includes an inner circumferential facet 70, an outer circumferential facet 72, an inner transverse facet 74, and an outer transverse facet 76. The ring 68 defines an attachment hole 94 into which a pin 42 extends.

[0082] The inner circumferential surface 70 of ring 68 defines an attachment hole 94, into which pin 42 extends. The attachment hole 94 extends from the inner surface 48 of structural layer 12 to the outer surface 56 of finishing layer 22.

[0083] The outer circumferential surface 72 and the inner circumferential surface 70 of the ring 68 are radially opposite each other and extend against the edge 60 of the through hole 24.

[0084] The inner transverse facet 74 of ring 68 faces the body 10. The inner transverse facet 74 extends in a continuous form of the inner surface 26 of the covering layer 12 (i.e., in a continuous form of the inner facet 48 of the structural layer 20).

[0085] The outer transverse face 76 is opposite to the inner transverse face 74. The outer transverse face 76 extends in a continuous form of the outer surface 28 of the covering layer 12 (i.e., in a continuous form of the outer face 56 of the finishing layer 22).

[0086] The inner transverse face 74 and the outer transverse face 76 of ring 68 connect the inner circumferential face 70 and the outer circumferential face 72 of ring 68.

[0087] Pin 42 mates with the fixing support 40 and the storage device 14 to attach the storage device 14 to the cover layer 12. Pin 42 mates, for example, with the frame 34 of the storage device 14. Pin 42 includes a base 80 and two feet 82 extending from the base 80. Pin 42 is at least partially inserted into the fixing support 40.

[0088] The base 80 of pin 42 extends opposite to the outer transverse portion 76 of ring 68. For example... Figure 4As shown, the base 80 also extends relative to, for example, the frame 34 and the sheet 32. The base 80 includes a support surface 98 facing the outer lateral portion 76 of the ring 68. The support surface 98 rests against the protrusion 114 of the cover 44, as described below. According to a variant not shown, the support surface 98 rests against the sheet 32 ​​to press the sheet 32 ​​against the cover layer 12.

[0089] Optionally, the base 80 includes a ramp 100 oriented relative to the support surface 98. The ramp 100 engages with the cover 44 to facilitate its application around the pin 42.

[0090] Reference Figure 4 Each foot 82 of pin 42 extends from base 80 toward ring 68 parallel to axis A-A'.

[0091] Specifically, the two feet 82 extend parallel to each other in a plane P that includes the axis A-A' and is perpendicular to the extension direction D of the rod 64 of the frame 34.

[0092] Each foot 82 extends into the attachment hole 94 and rests against the inner circumferential surface 70 of the ring 68. The two feet 82 define a space 102 between them for receiving the frame 34.

[0093] Each foot 82 includes a retaining protrusion 104 extending into a receiving space 102. The frame 34 is held in the receiving space 102 between the base 80 of the pin 42 and the retaining protrusion 104. The retaining protrusion 104 defines a channel between them, the dimension of which corresponding to the distance between the retaining protrusions 104 is smaller than the diameter of the rod 64. The retaining protrusion 104 is configured, for example, to elastically deform when the frame 34 is inserted into the receiving space 102 between the base 80 of the pin 42 and the retaining protrusion 104, to allow the frame 34 to pass toward the base 80 of the pin 42.

[0094] Each foot 82 includes an end that extends opposite to the inner transverse face 74 of the ring 68. Thus, each foot 82 extends from the base 80 on one side of the cover layer 12, particularly from the outside of the cover layer 12, to its end on the other side of the cover layer 12, particularly from the inside of the cover layer 12.

[0095] Each foot 82 includes a stop 108 at its end for holding the pin 42 in place.

[0096] The stop portion 108 of each foot 82 extends radially away from the axis A-A' relative to the axis A-A'. For example... Figure 4 As shown, for example, each stop 108 includes an angled guide surface 118 that allows the pin 42 to be guided when it is inserted into the attachment hole 94.

[0097] Each stop 108 of each foot 82 rests against the inner transverse face 74 of the ring 68. In particular, each stop 108 includes a retaining surface 120 that mates with the inner transverse face 74 of the ring 68 to prevent displacement of the pin 42 away from the cover layer 12.

[0098] Specifically, when pin 42 is inserted into attachment hole 94, guide surface 118 engages with ring 68 to bring feet 82 closer together and allow feet 82 to be inserted into attachment hole 94. After insertion, feet 82 move away from each other, and then surface 120 engages with inner transverse face 74 of ring 68.

[0099] Reference Figure 1 and Figure 4 A cover 44 covers each pin 42. The cover 44 includes a main wall 86, two side walls 88 extending from the main wall 84 toward the fixed support 40, and support arms 90 configured to press the sheet 32 ​​against the cover layer 12. The cover 44 is applied around the pin 42 when the storage device 14 is attached to the cover layer 12.

[0100] As described below, for example, the cover 44 also mates with the pin 42 and the fixing support 40 to attach the storage device 14 to the cover layer 12. Furthermore, the cover 44 improves the aesthetics of the backrest 3 because it conceals the fixing device 16.

[0101] Reference Figure 1 , Figure 2 and Figure 4 The main wall 86 of the cover 44 extends in a plane substantially perpendicular to the axis A-A'.

[0102] Each sidewall 88 of the cover 44 extends from the main wall 86 toward the fixed support 40 to the support end 112.

[0103] like Figure 4 As shown, the support end 112 rests against the sheet 32, thereby clamping the sheet 32 ​​between the support end 112 and the outer transverse face 76 of the ring 68.

[0104] Each sidewall 88 includes a protrusion 114 at its supporting end 112 for holding the pin 42 in place.

[0105] The protrusions 114 of each sidewall 88 of the cover 44 extend radially toward axis A-A' between the support surface 98 of the base 80 of the pin 42 and the sheet 32. Figure 4 As shown, each protrusion 114 includes, for example, an angled guide surface 124 for guiding the cap 44 during insertion of the cap 44 around the pin 42.

[0106] Each protrusion 114 is pressed between the support surface 98 of the base 80 of the pin 42 and the sheet 32. Thus, the support surface 98 of the base 80 of the pin 42 rests against the protrusion 114 of each sidewall 88, so that the pin 42 is held in place along the axis A-A'.

[0107] When the cap 44 is applied around the pin 42, the guide surface 124 engages with the bevel 100 of the base 80 of the pin 42 to separate the sidewalls 88 of the cap 44 from each other. After the cap 44 is applied around the pin 42, the sidewalls 88 move toward each other, and then the protrusion 114 is pressed between the support surface 98 and the sheet 32.

[0108] Support arm 90 extends from side wall 88 toward sheet 32 ​​to clamp sheet 32 ​​against cover layer 12.

[0109] The support arm 90 includes a first branch extending away from the sidewall 88 and a second branch extending from the first branch toward the sheet 32.

[0110] In the following text, refer to Figure 5 and Figure 6 The method for manufacturing the backrest 3 is described.

[0111] The method initially includes providing a body 10, a storage device 14, and a fixing device 16. The method includes manipulating the fixing device 16, which includes at least one fixing support 40 and at least one pin 42. However, for the sake of brevity, only one fixing support 40 and one pin 42 will be described below.

[0112] The method includes the step of overmolding the cover layer 12 onto the fixed support 40.

[0113] The overmolding of the cover layer 12 may include, for example, providing a forming tool 150, which includes a first forming surface 152 and an imprint 154 of an attachment hole 94, the first forming surface 152 having the shape of an outer surface 28 of the cover layer 12. The forming tool also includes a second forming surface 156 having the shape of an inner surface 26 of the cover layer 12.

[0114] The marking 154 of the attachment hole 94 protrudes from the first surface 152 and has a shape that matches the shape of the attachment hole 94.

[0115] Then, the overmolding process includes setting the ring 68 around the imprint 154 and against the first molding surface 152.

[0116] like Figure 5 As shown, overmolding also includes, for example, forming a finishing layer 22 on the first forming surface 152.

[0117] A finishing layer 22 is formed by applying a coating to the first forming surface 152 of the forming tool 150 to form a coating layer 57, followed by applying a surface layer 58 to the coating layer 57 in the forming tool 150. Preferably, the coating layer 57 or the surface layer 58 is applied by spraying a coating or spraying a liquid polyurethane, respectively.

[0118] For example, heating the first forming surface 152 can achieve rapid drying of the finishing layer 22.

[0119] According to one embodiment, a release agent is first applied to the first molding surface 152 before the finishing layer 22 is formed, and then a coating layer 57 is applied to the release agent lining the first molding surface 152. Such a release agent is applied, for example, by spraying onto the first molding surface 152, and facilitates the removal of the resulting cover layer 12 from the molding tool, as will be described later.

[0120] like Figure 5 As shown, the finishing layer 22 then extends around the fixed support 40 (i.e., ring 68).

[0121] Finally, overmolding also includes applying a structural layer 20 to the inner surface 54 of the finishing layer 22. Preferably, the structural layer 20 is applied by applying foam (e.g., PU foam) to the surface layer 158 in the forming tool 150.

[0122] To this end, the second molding surface 156 is brought closer to the first molding surface 152 to form a molding space between them for the structural layer 20. The molding tool thus has a system (not shown) for injecting foam (e.g., PU foam) into the molding space of the structural layer 20. The second molding surface 156 includes, for example, a recess 158 in which the imprint 154 of the first molding surface 152 extends. The recess 158 has a shape that substantially matches, for example, the shape of the imprint 154. The injected foam then extends on the finishing layer 22 around the fixing support 40 between the first molding surface 152 and the second molding surface 156. Therefore, foam is applied by injecting it into the molding space between the first molding surface 152 and the second molding surface 156. After injection, the foam takes on the shape of the molding space and matches the shapes of the first molding surface 152 and the second molding surface 156. Thus, the structural layer 20 has the shape of the inner surface 26 of the cover layer 12.

[0123] According to one embodiment, before manufacturing the structural layer 20, a release agent is first applied to the second molding surface 156.

[0124] Therefore, in summary, the formation of the finishing layer 22 includes applying a coating to the first forming surface 152 of the forming tool 150 and applying a surface layer 58 to the coating layer 57 in the forming tool 150. The formation of the cover layer 12 includes the formation of the finishing layer 22 and the application of the structural layer 20, the application of the structural layer 20 including the application of foam to the surface layer 58 in the forming tool 150.

[0125] After the structural layer 20 and the finishing layer 22 have cooled and hardened, the cover layer 12 and the fixing support 40 form an adhesive assembly, wherein the structural layer 20, the finishing layer 22, and the fixing support 40 are attached to each other. The forming tool 150 is then opened, and the assembly including the cover layer 12 and the fixing support 40 is removed from the forming tool 150. This operation is easier when a release agent has been applied to the first forming surface 152 and / or the second forming surface 156.

[0126] The method then includes the step of placing a cover 12 on the back of the body 10 such that the cover 12 covers at least a portion of the body 10. Advantageously, a cover 11 is placed on the front of the body 10 such that the cover 11 covers at least a portion of the body 10. A mechanical connection 19 is formed between the cover 11 and the cover 12 such that the cover 11 and the cover 12 are held close to the body 10.

[0127] In one variation, the cover layer 12 is attached to the inner frame 18 of the body 10 by at least one clip.

[0128] Finally, the method includes the step of setting a pin 42 such that the pin 42 engages with the fixing support 40 and the storage device 14 to attach the storage device 14 to the cover layer 12.

[0129] In the first stage, the frame 34 is introduced, for example, into the receiving space 102 between the base 80 of the pin 42 and the retaining protrusion 104 so that it can be held therein.

[0130] The pin 42 is then inserted into the attachment hole 94. The guide surface 118 then engages with the ring 68 to bring the feet 82 closer together and allow the feet 82 to be inserted into the attachment hole 94. After insertion, the feet 82 move away from each other, and then the surface 120 engages with the inner lateral face 74 of the ring 68 to prevent the pin 42 from shifting away from the cover layer 12.

[0131] Optionally, a cap 44 is then applied around the pin 42. The guide surface 124 then engages with the bevel 100 of the base 80 of the pin 42 so that the sidewalls 88 of the cap 44 move away from each other. After the cap 44 is applied around the pin 42, the sidewalls 88 move toward each other, and then the protrusion 114 is pressed between the support surface 98 and the sheet 32.

[0132] Therefore, pin 42 is held in place along axis A-A', and sheet 32 ​​is pressed against cover layer 12 by support end 112.

[0133] In this way, the storage device 14 is attached to the cover layer 12.

[0134] Thanks to the present invention, the storage device 14 can be securely attached to the cover layer 12 while maintaining the integrity of the cover layer 12. In fact, for example, it is not necessary to perforate the cover layer 12 to adapt it to the means for attaching the storage device 14.

[0135] Since attachment is provided through the engagement of pin 42 with the fixed support 44, it is not necessary to directly use the cover layer 12 to support the storage device 14. Therefore, wear on the cover layer 12 can be reduced.

Claims

1. A backrest (3) of a vehicle seat (1) comprising a body (10), a cover layer (12) designed to be placed on the back of the body (10) and cover at least a portion of the body (10), a storage device (14) defining a storage volume on a portion of the cover layer (12), and a fixing device (16) for attaching the storage device (14) to the cover layer (12), the fixing device (16) comprising at least one fixing support (40) and at least one pin (42), the cover layer (12) being overmolded on the at least one fixing support (40), the at least one pin (42) cooperating with the at least one fixing support (40) and the storage device (14) to attach the storage device (14) to the cover layer (12).

2. The seat back (3) according to claim 1, wherein, The covering layer (12) comprises polyurethane and / or plastic.

3. The seat back (3) according to claim 1 or 2, wherein, The cover layer (12) has at least one through hole (24) with an edge (60), and the at least one fixing support (40) is a ring (68) extending about an axis (A-A') into the at least one through hole (24), the ring (68) including an inner circumferential face (70) and an outer circumferential face (72), the inner circumferential face (70) defining an attachment hole (94), the at least one pin (42) extending in the attachment hole (94), the outer circumferential face (72) being radially opposite to the inner circumferential face (70) and extending against the edge (60) of the corresponding through hole (24).

4. The seat back (3) according to claim 3, wherein, The cover layer (12) includes a structural layer (20) and a finishing layer (22). The structural layer (20) includes an inner surface (48) facing the body (10) and an outer surface (50) opposite to the inner surface (48). The finishing layer (22) has an inner surface (54) extending over at least a portion of the outer surface (50) of the structural layer (48) and an outer surface (56) opposite to the inner surface (54) of the finishing layer (22). The attachment hole (94) extends from the inner surface (48) of the structural layer (20) to the outer surface (56) of the finishing layer (22).

5. The seat back (3) according to claim 4, wherein, The finishing layer (22) includes a coating layer (57) and a non-porous anhydrous polyurethane surface layer (58), the coating layer (57) being formed by applying a coating to the forming surface of a forming tool, the surface layer (58) being applied to the coating layer (57) in the forming tool, and the structural layer (20) being made of foam and formed by applying the foam to the surface layer (58) in the forming tool.

6. The seat back (3) according to claim 1 or 2, wherein, The storage device (14) includes a sheet (32) and a frame (34) surrounding the sheet (32), the sheet (32) being attached to the frame (34), the at least one pin (42) engaging with the frame (34), and the storage volume extending between the cover layer (12) and the sheet (32).

7. The seat back (3) according to claim 3, wherein, The storage device (14) includes a sheet (32) and a frame (34) surrounding the sheet (32), the sheet (32) being attached to the frame (34), the at least one pin (42) engaging with the frame (34), the storage volume extending between the cover layer (12) and the sheet (32), wherein the ring (68) further includes an inner transverse facet (74) facing the body (10) and an outer transverse facet (76) opposite to the inner transverse facet (74). The inner transverse face (74) and the outer transverse face (76) connect the inner circumferential face (70) and the outer circumferential face (72). Each pin (42) includes a base (80) and two feet (82) extending from the base (80) parallel to the axis (A-A'). The two feet (82) rest on the inner circumferential face (70) of the ring (68) and define a receiving space (102) between them for receiving the frame (34).

8. The seat back (3) according to claim 7, wherein, Each foot (82) of the at least one pin (42) includes a retaining protrusion (104) extending into the receiving space (102), in which the frame (34) is held between the base (80) of the pin (42) and the retaining protrusion (104) in the receiving space (102).

9. The seat back (3) according to claim 7 or 8, wherein, The base (80) of the at least one pin (42) extends opposite to the outer transverse face (76) of the ring (68), each foot (82) includes an end extending facing the inner transverse face (74) of the ring (68), each foot (82) including at its end a stop (108) extending radially away from the axis (A-A') relative to the axis (A-A'), each stop (108) abutting against the inner transverse face (74) of the ring (68).

10. The seat back (3) according to claim 9, wherein, The fixing device (16) further includes a cover (44) covering the at least one pin (42), the cover (44) including a main wall (86) extending in a plane substantially perpendicular to the axis (A-A'), and two side walls (88) extending from the main wall (86) toward the fixing support (40) toward a support end (112), the support end (112) abutting against the sheet (32) such that the sheet (32) is clamped between the support end (112) and the pin. Between the outer transverse portions (76) of the ring (68), each sidewall (88) includes a protrusion (114) extending radially toward the axis (A-A'), and the base (80) of the at least one pin (42) includes a support surface (98) facing the outer transverse portions (76) of the ring (68), the support surface (98) resting against each protrusion (114) of the sidewall (88) such that the at least one pin (42) is held in place along the axis (A-A').

11. A vehicle seat (1) comprising a seat cushion (2), a seat back (3) according to claim 1 or 2, and a seat headrest (4).

12. A method for manufacturing a backrest (3) for a vehicle seat (1), comprising the following steps: Provides a main body (10), a storage device (14), and a fixing device (16) for attaching the storage device (14) to a cover (12) of the seat (1), the fixing device (16) including at least one fixing support (40) and at least one pin (42); The covering layer (12) is formed over the at least one fixed support member (40); The cover layer (12) is placed on the back of the body (10), and the cover layer (12) covers at least a portion of the body (10); The at least one pin (42) is configured such that the at least one pin (42) engages with the at least one fixing support (40) and the storage device (14) to attach the storage device (14) to the cover layer (12).

13. The method according to claim 12, wherein, The at least one fixed support (40) is a ring (68), and the covering layer (12) is overmolded onto the at least one fixed support (40) including the following steps: A forming tool (150) is provided, the forming tool (150) including a first forming surface (152) having the shape of an outer surface (28) of the cover layer (12) and an imprint (154) of an attachment hole (94), wherein at least one pin (42) is designed to extend in the attachment hole (94); The ring (68) is positioned around the imprint (154) and against the first shaped surface (152); A finishing layer (22) is formed on the first shaped surface (152); and A structural layer (20) is applied to the inner surface (54) of the finishing layer (22).

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