Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
  • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
  • B60N2/70—Upholstery springs ; Upholstery
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y80/00—Products made by additive manufacturing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
  • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
  • B60N2/64—Back-rests or cushions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
  • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
  • B60N2/70—Upholstery springs ; Upholstery
  • B60N2/7017—Upholstery springs ; Upholstery characterised by the manufacturing process; manufacturing upholstery or upholstery springs not otherwise provided for

Definitions

• the present invention relates to a monolithic cushion, in particular produced by 3D printing.
• the invention is more particularly interested in cushions adapted to a vehicle seat.
• a vehicle seat comprises a seat and a backrest.
• the geometry of the seat and/or backrest may have complex shapes with in particular different inclined walls intended to maintain the driver's body in a position as stable as possible on the seat.
• soft cushions are placed on the different walls constituting the seat.
• the invention aims to meet this objective and has as its object, according to one of its aspects, a monolithic cushion, in particular produced by 3D printing, said cushion comprising:
• a cushion body ensuring contact comfort, said body comprising at least one comfort layer constituting the heart of the cushion and comprising at least one layer of openwork cells,
• a support sheet distinct from the cushion body and at least partially surrounding it so as to at least partially delimit the peripheral cells of the comfort layer, the support sheet comprising a plurality of meshes.
• the cushion is in the form of a single piece block.
• the cushion is made of a single material, that is to say it comes from material.
• the holding sheet according to the invention has several advantages.
• said layer has strands of cells at its lateral ends. These cell strands can be free or joined.
• the comfort layer may thus have protruding and/or floating shapes at its side faces, making them less pleasant to contact.
• the support sheet helps retain these strands of cells in order to make the cushion softer to the touch. This avoids any possible discomfort and/or aggression for the user.
• the cushion may be subjected to repeated friction and shear stresses which are unfavorable to the durability of the cellular comfort layer.
• the support sheet thus improves the durability of the cushion, by creating a protective interface with the comfort layer. This reduces the risk of tearing and/or snagging of the cell strands at the periphery of the comfort layer.
• the support sheet also makes it possible to stiffen the structure of the cushion, by compensating for the weakness of the perforated cells present at the periphery of the comfort layer. This thus makes it possible to minimize or even eliminate the effect of collapse at the periphery of the layer.
• the holding sheet also has an aesthetic function. It makes it possible to give an overall shape to the cushion, by delimiting its borders, and by connecting the strands of cells at the periphery. This can make it possible, if desired, to stretch a fabric around the cushion without the appearance of unwanted ridges or curvatures. It also offers the possibility of adding a graphic pattern.
• the hollow structure of the support sheet makes it possible to lighten the cushion as much as possible and to facilitate dust removal from said cushion at the end of its manufacturing process, in particular by 3D printing. Indeed, at the end of the process, dust remains stored in the cushion and it is necessary to be able to evacuate it simply and quickly. quickly.
• the hollow structure of the sheet can also facilitate other post-manufacturing treatments such as the application of coating for example.
• the cushion is obtained by 3D printing.
• the support sheet is in contact with the comfort layer, in particular in contact with the peripheral cell strands.
• the cushion body has two opposite faces and the retaining sheet extends along a peripheral edge joining the two faces.
• the holding sheet has a width substantially identical to the thickness of the cushion body, in particular at the height of the peripheral edge of the cushion body.
• the holding sheet has a thickness of less than 20 mm, better still less than 10 mm, even better less than 5 mm.
• the meshes of the holding sheet are designed to promote the deformation of the sheet along a single axis of deformation. This allows better control of the deformation of the sheet in a predetermined direction and makes it possible to minimize or even avoid any other unwanted movement.
• these meshes each have a diamond shape.
• the meshes of the holding sheet can be identical.
• the meshes of the holding sheet have different shapes and/or different dimensions.
• the holding sheet can be single-layer or multi-layer. It may in particular comprise at least two layers superimposed at least partially on one another.
• the retaining layer can be continuous or discontinuous.
• it may comprise at least two separate segments arranged at predefined locations on the periphery of the cushion body.
• the holding sheet may have substantially flat faces.
• at least one of the faces of the holding sheet has one or more reliefs.
• These reliefs can be intended to receive interfaces specific to the functional environment of the cushion.
• the reliefs can be used to accommodate interfaces linked to vehicle safety such as airbags, or even interfaces linked to function controls or sensors, such as as switches, dimmers, thermal sensors, presence sensors.
• the reliefs can also receive interfaces for protecting the comfort layer, interfaces with other elements of the vehicle's interior furniture, such as a central console, interior trim, or even interfaces for decorative elements, such as a snap surface or embroidery areas.
• the number of layers constituting the comfort layer depends on the thickness and deformation properties sought for the cushion.
• the comfort layer may be flat or not. When it is non-flat, the comfort layer may have at least one fold so as to present two consecutive sections inclined relative to each other.
• the comfort layer comprises perforated cells in the shape of a truncated octahedron. This gives the comfort layer a good ability to deform, thus increasing the comfort of the cushion. This also makes it easier to dust the cushion, as mentioned above.
• Other shapes of openwork cells can be used depending on the desired mechanical behavior.
• the invention also relates to a method of manufacturing a cushion according to the invention, comprising the steps consisting of:
• the digital model comprises a plurality of voxels.
• a voxel designates a volumetric unit of a digital 3D space, preferably cubic in shape. This unit can be assembled into several units by mathematical operations to create objects of different shapes.
• the voxel can be full or empty, which corresponds to the presence or absence of matter.
• the invention also relates to a vehicle seat comprising at least one cushion according to the invention.
• the vehicle seat may comprise a seat and a backrest, F at least one cushion according to the invention can be fixed to at least one of the two elements constituted by said backrest and said seat.
• the invention also relates to a vehicle comprising a seat according to the invention.
• FIG.1 is a schematic and partial view of a cushion according to the invention.
• FIG.2 is an exploded view of the cushion according to the invention.
• FIG.3 is a longitudinal section of the cushion of [Fig.l] according to the plan
• FIG.6 is a perspective view of the retaining sheet according to the invention.
• the cushion 10 comprises a cushion body 100.
• This cushion body 100 comprises a first face 120 intended to come into contact with the user, a second face 124 parallel to the first face 120 and opposite it and a peripheral edge 122 joining the first and second faces 120 and 124.
• first and second faces 120 and 124 are planar, but we do not depart from the scope of the invention if they have different shapes, in particular protrusions of material.
• the cushion body 100 comprises the following distinct layers:
• a front contact layer 101 comprising a single layer materializing a grid of several solid unit cells 102, connected to each other by arms revealing free spaces between said solid unit cells 102.
• These solid unit cells 102 have the same dimensions within said front layer 101, and each have a rectangular shape.
• Each of these solid unit cells 102 has a central opening 103.
• the thickness of this front layer is a single layer materializing a grid of several solid unit cells 102, connected to each other by arms revealing free spaces between said solid unit cells 102.
• These solid unit cells 102 have the same dimensions within said front layer 101, and each have a rectangular shape.
• Each of these solid unit cells 102 has a central opening 103.
• the solid unit cells 102 of the front layer 101 are connected together by non-rectilinear arms 150, which may for example have a curvature or at least one fold.
• these arms 150 can easily accompany this deformation by deploying.
• the arms 150 deploy, they will tend to adopt an elongated rectilinear profile,
• a soft intermediate layer 104 comprising a single layer materializing a grid of several hollow unit cells 105, connected to each other by arms revealing free spaces between said hollow unit cells 105, said intermediate layer 104 being in contact with the layer before 101 such that each full unit cell
• the hollow unit cells 105 of the intermediate layer 104 are of elliptical shape, trapezoidal or other, and have dimensions less than or equal to those of the solid unit cells 102 of the layer before 101 of contact.
• the thickness of this intermediate layer 104 is less than or equal to 5 mm, and
• each of the perforated cells 107 has the shape of a truncated octahedron.
• the cushion 10 further comprises a holding sheet 112 distinct from the cushion body 100, and extending over the periphery of this cushion body 100.
• the support sheet 112 is in the form of a strip surrounding the lateral edge of the cushion body 110.
• the support sheet 112 comes into contact with the comfort layer 106 and is connected to the openwork cells 107 thereof by connecting strands 117, as is visible in [Fig.3].
• the holding sheet 112 is continuous and extends over the entire length of the lateral edge 122 of the body of the cushion 100.
• the holding sheet 112 has a width L substantially identical to the cushion body thickness 100.
• the retaining layer 112 may present at its junction with the first and second faces 120 and 124 a rim 140.
• the holding sheet 20 comprises a plurality of meshes 130.
• the meshes 130 each have a general diamond shape. These meshes 130 are designed so as to promote the deformation of the retaining sheet 112 in the width direction, along a single axis of deformation XI, to accompany the deformation of the body of the cushion 100, when, for example, the user sits on the body of the cushion 100, as can be seen in [Fig.5].
• the meshes 130 undergo compression along the deformation axis an insignificant or even zero movement along an axis perpendicular to XL Also, thanks to the shape and arrangement of the meshes, it is possible to control the movement of the support sheet and thus avoid any unwanted movement during the stresses of the cushion .
• the meshes of the sheet may have a shape other than that of a diamond.
• the retaining sheet may have one or more discontinuity(s) of material and/or extend partially over a shorter length of the edge of the body of the cushion.

Landscapes

• Engineering & Computer Science (AREA)
• Aviation & Aerospace Engineering (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Mattresses And Other Support Structures For Chairs And Beds (AREA)
• Chair Legs, Seat Parts, And Backrests (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=86657039

Family Applications (1)

Country Status (4)

Family Cites Families (3)

• 2022
  • 2022-12-21 FR FR2214173A patent/FR3143958A1/fr active Pending
• 2023
  • 2023-12-21 CN CN202380094454.7A patent/CN121001874A/zh active Pending
  • 2023-12-21 WO PCT/FR2023/052086 patent/WO2024134108A1/fr not_active Ceased
  • 2023-12-21 EP EP23841300.9A patent/EP4638112A1/de active Pending

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