FR2933895A1 - Cover fixing method for rear plate of e.g. seat element, in motor vehicle, involves embedding edges of cover in thickness of rear plate of seat element, under thermal and pressure constraints, where plate is made of expanded polypropylene - Google Patents

Cover fixing method for rear plate of e.g. seat element, in motor vehicle, involves embedding edges of cover in thickness of rear plate of seat element, under thermal and pressure constraints, where plate is made of expanded polypropylene Download PDF

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Publication number
FR2933895A1
FR2933895A1 FR0854932A FR0854932A FR2933895A1 FR 2933895 A1 FR2933895 A1 FR 2933895A1 FR 0854932 A FR0854932 A FR 0854932A FR 0854932 A FR0854932 A FR 0854932A FR 2933895 A1 FR2933895 A1 FR 2933895A1
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FR
France
Prior art keywords
cap
expanded polypropylene
plate
seat
motor vehicle
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Granted
Application number
FR0854932A
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French (fr)
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FR2933895B1 (en
Inventor
Regis Couedro
Nicolas Besnard
Ali Meziane
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Faurecia Sieges dAutomobile SAS
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Faurecia Sieges dAutomobile SAS
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Application filed by Faurecia Sieges dAutomobile SAS filed Critical Faurecia Sieges dAutomobile SAS
Priority to FR0854932A priority Critical patent/FR2933895B1/en
Publication of FR2933895A1 publication Critical patent/FR2933895A1/en
Application granted granted Critical
Publication of FR2933895B1 publication Critical patent/FR2933895B1/en
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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
    • B60N2/58—Seat coverings
    • B60N2/5816—Seat coverings attachments thereof
    • B60N2/5866—Seat coverings attachments thereof by thermal welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/56—After-treatment of articles, e.g. for altering the shape
    • B29C44/5681—Covering the foamed object with, e.g. a lining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7441—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc for making welds and cuts of other than simple rectilinear form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/727—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being porous, e.g. foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/303—Particular design of joint configurations the joint involving an anchoring effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/303—Particular design of joint configurations the joint involving an anchoring effect
    • B29C66/3032—Particular design of joint configurations the joint involving an anchoring effect making use of protusions or cavities belonging to at least one of the parts to be joined
    • B29C66/30325—Particular design of joint configurations the joint involving an anchoring effect making use of protusions or cavities belonging to at least one of the parts to be joined making use of cavities belonging to at least one of the parts to be joined
    • B29C66/30326—Particular design of joint configurations the joint involving an anchoring effect making use of protusions or cavities belonging to at least one of the parts to be joined making use of cavities belonging to at least one of the parts to be joined in the form of porosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2313/00—Use of textile products or fabrics as reinforcement

Abstract

The method involves embedding edges (341) of a non-woven fabric cover (34) in thickness of a rear plate (33) of a seat element (3) in a motor vehicle, under thermal and pressure constraints, where the edges are constituted of textile band or polyester and the plate is made of expanded polypropylene. The cover is placed around the element such that the edges are contacted with the plate. A heated fixation tool is pressed on the edges such that the edges are engaged in the plate. An independent claim is also included for a tool for fixing a cover on a rear plate of a seat element of a motor vehicle, comprising a frame.

Description

B8932 - 2486 1.FR 1 FIXATION D'UN REVÊTEMENT DE SIÈGE POUR VÉHICULE AUTOMOBILE B8932 - 2486 1.EN 1 FIXING A SEAT COVER FOR A MOTOR VEHICLE

Domaine de l'invention La présente invention concerne de façon générale les sièges pour véhicule automobile et, plus particulièrement, la fixation d'une coiffe d'un élément de ce siège sur une partie en polypropylène expansé de cet élément. Exposé de l'art antérieur La figure 1 est une vue latérale schématique d'un siège 1 pour véhicule automobile du type auquel s'applique à titre d'exemple la présente invention. Un tel siège comporte une assise 11 destinée à être fixée, le cas échéant par l'intermédiaire de glissières (non représentées) à un plancher 2 de véhicule automobile. Un dossier 12 est généralement articulé (articulation 13) au dossier et porte le plus souvent, à son extrémité libre, un appui-tête. Le cas échéant, des accoudoirs (non représentés) équipent également le siège. Les différents éléments du siège (médaillon d'assise, dossier, appui-tête, accoudoirs) comportent une garniture formée d'une matelassure, généralement en mousse, revêtue d'une coiffe. Dans les éléments de siège auxquels s'applique la pré- sente invention, la face arrière de l'élément (le dessous de l'assise, l'arrière du dossier, l'arrière de l'appui-tête) est constituée par une plaque en polypropylène expansé. FIELD OF THE INVENTION The present invention relates generally to motor vehicle seats and, more particularly, to the attachment of a cap of an element of this seat to an expanded polypropylene portion of this element. DESCRIPTION OF THE PRIOR ART FIG. 1 is a schematic side view of a seat 1 for a motor vehicle of the type to which the present invention applies by way of example. Such a seat comprises a seat 11 intended to be fixed, where appropriate by means of slides (not shown) to a floor 2 of a motor vehicle. A backrest 12 is generally hinged (articulation 13) to the backrest and usually carries, at its free end, a headrest. If necessary, armrests (not shown) also equip the seat. The various elements of the seat (medallion of seat, backrest, headrest, armrests) comprise a padding formed of a padding, usually foam, covered with a cap. In the seat elements to which the present invention applies, the rear face of the element (the underside of the seat, the back of the backrest, the rear of the headrest) is constituted by a expanded polypropylene sheet.

B8932 - 2486 1.FR B8932 - 2486 1.EN

2 La figure 2 est une vue en coupe très schématique selon la ligne A-A de la figure 1, illustrant un procédé d'assemblage d'une coiffe 34 sur un élément 3 de siège. L'élément 3 comporte en face avant une matelassure 32 et en face arrière une plaque 33 en polypropylène expansé. La plaque 33 peut avoir des formes diverses et constituer, par exemple, une tablette lorsque le dossier est rabattu sur le siège. L'élément 3 est ensuite habillé d'une coiffe 34 dont la bordure est fixée en périphérie de la plaque 33. La coiffe 34 est en peau, en matériau synthétique ou textile, tissé ou non tissé, selon l'aspect final souhaité pour l'élément de siège. Le cas échéant, d'autres éléments sont inclus dans le siège, comme des coussins gonflables de sécurité, des coussins de réglage de confort (par exemple un coussin lombaire), etc. Dans certains cas, la coiffe 34 est pré-assemblée à la matelassure 32. La fixation de la bordure 341 de la coiffe 34 sur la périphérie de la plaque 33 de polypropylène expansé requiert classiquement d'interposer une bande ou couche de colle 35 entre les deux régions à assembler. Cette bande adhésive est soit rapportée sur la périphérie interne de la coiffe 34 soit sur la périphérie externe de la plaque 33 et l'assemblage s'effectue sous presse thermique. Une telle technique est décrite par exemple dans le 25 document DE-A-195 00 233. Un inconvénient est que les bords libres 341 de la bordure 341 de la coiffe doivent présenter un aspect esthétique fini (baguette de finition, ourlet ou autres), ce qui complique la fabrication. 30 Un autre inconvénient est l'interposition d'un adhésif. Résumé Il serait souhaitable de simplifier l'assemblage d'une coiffe sur un élément de siège en polypropylène expansé. Figure 2 is a highly schematic sectional view along the line A-A of Figure 1, illustrating a method of assembling a cap 34 on a seat member 3. The element 3 comprises on the front face padding 32 and on the back a plate 33 expanded polypropylene. The plate 33 may have various shapes and constitute, for example, a tablet when the folder is folded down on the seat. The element 3 is then dressed with a cap 34 whose edge is fixed at the periphery of the plate 33. The cap 34 is made of skin, of synthetic or textile material, woven or non-woven, according to the final appearance desired for the seat element. If necessary, other elements are included in the seat, such as airbags, comfort adjustment cushions (eg a lumbar cushion), etc. In some cases, the cap 34 is pre-assembled to the padding 32. Fixing the edge 341 of the cap 34 on the periphery of the expanded polypropylene plate 33 conventionally requires interposing a strip or layer of adhesive 35 between the two regions to assemble. This adhesive tape is either attached to the inner periphery of the cap 34 or on the outer periphery of the plate 33 and the assembly is carried out under thermal press. Such a technique is described, for example, in DE-A-195 00 233. A disadvantage is that the free edges 341 of the border 341 of the cap must have a finished aesthetic appearance (finish rod, hem or others), which complicates the manufacture. Another disadvantage is the interposition of an adhesive. Summary It would be desirable to simplify the assembly of a cap on an expanded polypropylene seat member.

B8932 - 2486 1.FR B8932 - 2486 1.EN

3 Il serait également souhaitable de disposer d'un pro-cédé d'assemblage compatible avec les autres étapes de fabrication des sièges. Pour atteindre tout ou partie de ces objets ainsi que d'autres, il est prévu un procédé de fixation d'une coiffe d'un élément de siège pour véhicule automobile sur une plaque en polypropylène expansé de cet élément, une bordure de la coiffe étant enfoncée dans l'épaisseur du polypropylène expansé sous contraintes thermique et de pression. It would also be desirable to have an assembly method compatible with the other steps of manufacturing the seats. To achieve all or part of these objects as well as others, there is provided a method of fixing a cap of a seat element for a motor vehicle on an expanded polypropylene plate of this element, a border of the cap being embedded in the thickness of expanded polypropylene under thermal and pressure stresses.

Selon un mode de réalisation de la présente invention, la bordure de la coiffe est constituée d'une bande textile ou en polyester rapportée en périphérie de la coiffe. Selon un mode de réalisation de la présente invention, le procédé comporte les étapes de : placer la coiffe autour de l'élément de sorte que sa bordure soit en contact avec le polypropylène expansé ; et presser, sur ladite bordure, un outil chauffé pour que la bordure s'engage dans le polypropylène expansé. Selon un mode de réalisation de la présente invention, la coiffe recouvre une matelassure en face avant de l'élément, le polypropylène expansé étant constitutif d'une face arrière de cet élément. Selon un mode de réalisation de la présente invention, la coiffe est un textile non tissé. According to one embodiment of the present invention, the edge of the cap is made of a textile or polyester strip attached to the periphery of the cap. According to one embodiment of the present invention, the method comprises the steps of: placing the cap around the element so that its border is in contact with the expanded polypropylene; and pressing, on said edge, a heated tool so that the edge engages in the expanded polypropylene. According to one embodiment of the present invention, the cap covers a padding on the front face of the element, the expanded polypropylene constituting a rear face of this element. According to one embodiment of the present invention, the cap is a nonwoven fabric.

Il est également prévu un outil de fixation d'une coiffe d'élément de siège pour véhicule automobile contre une plaque en polypropylène expansé, comportant : un cadre ayant une section en forme de cornière dont une branche est destinée à presser la bordure de la coiffe dans 30 le polypropylène expansé ; et des moyens de chauffage au moins de ladite branche du cadre. Selon un mode de réalisation de la présente invention, l'outil comporte en outre des moyens pour presser le cadre 35 contre la plaque de l'élément de siège. There is also provided a tool for attaching a seat cover for a motor vehicle against an expanded polypropylene plate, comprising: a frame having an angle-shaped section whose branch is intended to press the edge of the cap in expanded polypropylene; and means for heating at least said branch of the frame. According to an embodiment of the present invention, the tool further comprises means for pressing the frame 35 against the plate of the seat member.

B8932 - 2486 1.FR B8932 - 2486 1.EN

4 Il est également prévu un élément de siège pour véhicule automobile comportant une matelassure, une plaque arrière en polypropylène expansé, et une coiffe. Il est également prévu un siège pour véhicule auto-5 mobile comportant au moins un tel élément. Brève description des dessins Ces objets, caractéristiques et avantages, ainsi que d'autres seront exposés en détail dans la description suivante de modes de mise en oeuvre et de réalisation particuliers faite 10 à titre non-limitatif en relation avec les figures jointes parmi lesquelles : la figure 1, décrite précédemment, est une vue latérale d'un siège pour véhicule automobile du type auquel s'applique à titre d'exemple la présente invention ; 15 la figure 2, décrite précédemment, est une vue en coupe selon la ligne A-A de la figure 1 d'un élément de siège illustrant un procédé d'assemblage classique ; la figure 3 est une vue en perspective éclatée d'un mode de réalisation d'un élément de siège et d'un outil de 20 fixation d'une coiffe à cet élément ; et les figures 4A, 4B et 4C illustrent un mode de mise en oeuvre du procédé d'assemblage d'une coiffe à un élément de siège. De mêmes éléments ont été désignés par de mêmes réfé-25 rences aux différentes figures qui ont été tracées sans respect d'échelle. Description détaillée Pour des raisons de clarté, seuls les éléments utiles à la compréhension de l'invention ont été représentés et seront 30 décrits. En particulier, les étapes de formation de l'élément de siège qui précèdent la fixation de la coiffe sur la face en polypropylène expansé de cet élément n'ont pas été détaillées, l'invention étant compatible avec les techniques usuelles de fabrication de tels éléments de siège. 4 There is also provided a seat element for a motor vehicle comprising a padding, an expanded polypropylene back plate, and a cap. There is also provided a seat for self-mobile vehicle comprising at least one such element. BRIEF DESCRIPTION OF THE DRAWINGS These and other objects, features, and advantages will be set forth in detail in the following description of particular embodiments and embodiments in a non-limitative manner with reference to the accompanying drawings in which: FIG. 1, previously described, is a side view of a motor vehicle seat of the type to which the present invention applies by way of example; Figure 2, previously described, is a sectional view along the line A-A of Figure 1 of a seat member illustrating a conventional assembly method; Figure 3 is an exploded perspective view of an embodiment of a seat member and a tool for attaching a cap to this member; and Figures 4A, 4B and 4C illustrate an embodiment of the method of assembling a cap to a seat member. The same elements have been designated by the same references in the various figures which have been drawn without respect of scale. Detailed Description For the sake of clarity, only the elements useful for understanding the invention have been shown and will be described. In particular, the stages of formation of the seat element which precede the fixing of the cap on the expanded polypropylene face of this element have not been detailed, the invention being compatible with the usual techniques of manufacturing such elements. seat.

B8932 - 2486 1.FR B8932 - 2486 1.EN

La figure 3 est une vue en perspective éclatée représentant un élément 3 de siège de véhicule automobile revêtu d'une coiffe 34 dont une bordure est destinée à être fixée à une plaque arrière 33 en polypropylène expansé, et d'un outil 4 d'assemblage 5 de cette coiffe à la plaque 3. Les figures 4A, 4B et 4C sont des vues en coupe, dans un plan vertical dans l'orientation de la figure 3, à trois étapes successives de l'assemblage. Comme précédemment, l'élément de siège 3 est formé, en face avant et le plus souvent latéralement, d'une matelassure 32 et, en face arrière, d'une plaque 33 en polypropylène expansé. Une des dernières étapes de fabrication de l'élément 3 consiste à le recouvrir d'une coiffe 34 en un matériau synthétique, en peau ou d'un textile, tissé ou non. La coiffe 34 entoure l'élé- ment 3 jusqu'à sa face arrière et sa bordure est destinée à être fixée à la plaque 33 en polypropylène expansé. Selon le mode de réalisation représenté en figure 3, la bordure à fixer est une bande textile ou en polyester 36 rapportée (par exemple, cousue) en périphérie 341 de la coiffe 34. Selon une variante illustrée par les figures 4A à 4C, les bords 341 de la coiffe sont directement fixés à la plaque 33 en polypropylène expansé. La fixation, que ce soit de la bande 36 ou directement des bords 341 est exclusivement thermique sans interposition d'une bande ou couche adhésive. Les bords 341 de la coiffe ou de la bande 36 sont enfoncés, à chaud et sous pression, dans l'épaisseur de la plaque en polypropylène (voir figure 4B) en appliquant sur la face arrière un outil 4 adapté. Le recours à une bande 36 en un matériau différent de celui de la coiffe est plus particulièrement adapté au cas où le matériau constitutif de la coiffe présente une température de fusion inférieure à la température de fusion du polypropylène expansé constitutif de la plaque 33. Si les bords de la coiffe 341 peuvent eux-mêmes supporter cette température de fusion, l'adjonction d'une bande est optionnelle, mais peut être pré- férée pour des raisons esthétiques. Les températures de fusion B8932 - 2486 1.FR FIG. 3 is an exploded perspective view showing a motor vehicle seat element 3 coated with a cap 34 whose edge is intended to be fixed to a rear plate 33 made of expanded polypropylene, and of an assembly tool 4. FIGS. 4A, 4B and 4C are sectional views, in a vertical plane in the orientation of FIG. 3, at three successive stages of the assembly. As before, the seat element 3 is formed, in the front face and usually laterally, a padding 32 and, on the rear face, a plate 33 expanded polypropylene. One of the last manufacturing steps of the element 3 consists in covering it with a cap 34 made of a synthetic material, skin or a textile, woven or not. The cap 34 surrounds the element 3 to its rear face and its edge is intended to be fixed to the plate 33 expanded polypropylene. According to the embodiment shown in FIG. 3, the edge to be fixed is a textile or polyester strip 36 attached (for example, stitched) around the periphery 341 of the cap 34. According to a variant illustrated in FIGS. 4A to 4C, the edges 341 of the cap are directly attached to the plate 33 expanded polypropylene. Fixing, whether of the strip 36 or directly of the edges 341 is exclusively thermal without interposition of a strip or adhesive layer. The edges 341 of the cap or the band 36 are pressed, under heat and under pressure, into the thickness of the polypropylene plate (see FIG. 4B) by applying a tool 4 fitted on the rear face. The use of a strip 36 of a material different from that of the cap is more particularly adapted to the case where the constituent material of the cap has a melting temperature lower than the melting temperature of the expanded polypropylene constituting the plate 33. The edges of the cap 341 can themselves withstand this melting temperature, the addition of a band is optional, but can be preferred for aesthetic reasons. Melting temperatures B8932 - 2486 1.EN

6 des polypropylènes expansés utilisés sont, par exemple, autour de 150°C. Dans l'exemple représenté, l'outil 4 comporte, entre autres, un cadre 41 selon le motif de la ligne de fixation de la bordure 341 ou 36 de la coiffe à la plaque 33. Le cadre 41 est en forme de cornière dont une première branche 411 est destinée à enfoncer l'extrémité de la bordure dans la plaque 33 et dont une deuxième branche 412 approximativement perpendiculaire est destinée à plaquer le reste des bandes 36 et/ou des bords 341 contre la plaque 33 pendant l'assemblage. Le cadre 41 est de préférence métallique, par exemple en aluminium, de façon à pou-voir être chauffé pour que sa branche 411 puisse faire fondre le polypropylène expansé localement lors de l'enfoncement de la bordure dans son épaisseur. The expanded polypropylenes used are, for example, around 150 ° C. In the example shown, the tool 4 comprises, inter alia, a frame 41 according to the pattern of the line for fixing the border 341 or 36 of the cap to the plate 33. The frame 41 is in the form of an angle first branch 411 is intended to drive the end of the edge into the plate 33 and a second branch approximately perpendicular to the second portion 412 is intended to press the rest of the strips 36 and / or edges 341 against the plate 33 during assembly. The frame 41 is preferably metal, for example aluminum, so as to be able to be heated so that its branch 411 can melt the expanded polypropylene locally during the depression of the edge in its thickness.

Des moyens de chauffage constitués de résistances thermiques 42 (figure 3) alimentés par un dispositif 43 ont été illustrés. Dans la représentation des figures 4A et 4B, la ou les résistances chauffantes 42 ont été représentées portées par la face arrière de la branche 412. Tout autre réalisation est possible pourvu d'être adaptée à chauffer localement le cadre et au moins sa branche 411, verticale dans l'orientation des figures. Par exemple, de tels moyens chauffants pourront être intégrés à la branche 411. De plus, si des résistances chauffantes constituent un moyen particulièrement simple, on pourra prévoir d'autres moyens, par exemple, des lampes chauffantes localisées, un flux d'air chaud orienté, etc. L'outil 4 peut être appliqué manuellement (il est alors pourvu de moyens de préhension adaptés) ou être associé à une presse (non représentée) dans un système plus automatisé. Heating means consisting of thermal resistors 42 (Figure 3) powered by a device 43 have been illustrated. In the representation of FIGS. 4A and 4B, the heating resistor (s) 42 have been represented carried by the rear face of the branch 412. Any other embodiment is possible provided to be adapted to locally heat the frame and at least its branch 411, vertical in the orientation of the figures. For example, such heating means may be integrated in the branch 411. Moreover, if heating resistors are a particularly simple means, other means may be provided, for example, localized heating lamps, a hot air flow. oriented, etc. The tool 4 can be applied manually (it is then provided with suitable gripping means) or be associated with a press (not shown) in a more automated system.

L'enfoncement thermique réalisé présente plusieurs avantages. Tout d'abord, cela permet la tenue de la coiffe sans qu'il soit nécessaire d'adjoindre une bande de colle, les bords étant désormais emprisonnés dans le polypropylène expansé une fois refroidi. A titre d'exemple particulier de réalisation, la B8932 - 2486 1.FR The heat sink achieved has several advantages. First, it allows the holding of the cap without the need to add a strip of glue, the edges are now trapped in the expanded polypropylene once cooled. As a specific example of embodiment, the B8932 - 2486 1.EN

7 profondeur d'enfoncement de la bordure dans le polypropylène expansé 33 est de quelques millimètres (par exemple entre 3 et 10 mm). Un autre avantage est que la tenue de la coiffe (le 5 rembordement du coussin) est améliorée. Un autre avantage est qu'il n'est désormais plus nécessaire que les bords 341 de la coiffe (ou de la bande 36) pré-sentent un aspect fini, l'assemblage par enfoncement dans la plaque en polypropylène expansé 33 fournissant cet aspect fini.The depth of penetration of the edge in the expanded polypropylene 33 is a few millimeters (for example between 3 and 10 mm). Another advantage is that the holding of the cap (the padding of the cushion) is improved. Another advantage is that it is no longer necessary for the edges 341 of the cap (or band 36) to have a finished appearance, the recess assembly in the expanded polypropylene plate 33 providing this finished appearance. .

10 En particulier, il est possible de prévoir des lignes d'enfoncement selon des lignes de style souhaitées en face arrière de l'élément 3. Divers modes de réalisation ont été décrits. Diverses variantes et modifications apparaîtront à l'homme de l'art. En 15 particulier, les dimensions à donner au rebord de coiffe en face arrière de l'élément dépendent du siège et de l'effet esthétique souhaité. De plus, bien que l'invention ait été décrite en relation avec un outil comportant une cornière en cadre pour assembler la coiffe à la plaque est en polyester expansé, tout autre outil 20 pourra être utilisé pourvu qu'il soit adapté à enfoncer la bordure de la coiffe dans l'épaisseur du polypropylène expansé. In particular, it is possible to provide driving lines according to desired style lines on the rear face of the element 3. Various embodiments have been described. Various variations and modifications will be apparent to those skilled in the art. In particular, the dimensions to be given to the cap rim on the back of the element depend on the seat and the desired aesthetic effect. In addition, although the invention has been described in connection with a tool having a frame angle to assemble the cap to the plate is expanded polyester, any other tool 20 may be used provided that it is suitable for driving the edge of the cap in the thickness of the expanded polypropylene.

Claims (9)

REVENDICATIONS1. Procédé de fixation d'une coiffe (34) d'un élément (3) de siège (1) pour véhicule automobile sur une plaque (33) en polypropylène expansé de cet élément, caractérisé en ce qu'une bordure (341, 36) de la coiffe est enfoncée dans l'épaisseur du polypropylène expansé sous contraintes thermique et de pression. REVENDICATIONS1. Method for fastening a cap (34) of a motor vehicle seat element (3) (1) to an expanded polypropylene plate (33) of this element, characterized in that a border (341, 36) the cap is embedded in the thickness of expanded polypropylene under thermal and pressure stresses. 2. Procédé selon la revendication 1, dans lequel la bordure de la coiffe (34) est constituée d'une bande textile ou en polyester (36) rapportée en périphérie de la coiffe. 2. Method according to claim 1, wherein the edge of the cap (34) consists of a textile web or polyester (36) attached to the periphery of the cap. 3. Procédé selon la revendication 1 ou 2, comportant les étapes de : placer la coiffe (34) autour de l'élément (3) de sorte que sa bordure (341, 36) soit en contact avec le polypropylène expansé (33) ; et presser, sur ladite bordure, un outil (4) chauffé pour que la bordure s'engage dans le polypropylène expansé (33). The method of claim 1 or 2, including the steps of: placing the cap (34) around the member (3) so that its border (341, 36) is in contact with the expanded polypropylene (33); and pressing, on said edge, a tool (4) heated so that the edge engages in the expanded polypropylene (33). 4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel la coiffe (34) recouvre une matelassure (32) en face avant de l'élément (3), le polypropylène expansé (33) étant constitutif d'une face arrière de cet élément. 4. Method according to any one of claims 1 to 3, wherein the cap (34) covers a padding (32) on the front of the element (3), the expanded polypropylene (33) constituting a face back of this element. 5. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel la coiffe (34) est un textile non tissé. The method of any one of claims 1 to 4, wherein the cap (34) is a nonwoven fabric. 6. Outil (4) de fixation d'une coiffe (34) d'élément (3) de siège (1) pour véhicule automobile contre une plaque (33) en polypropylène expansé conformément au procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il comporte : un cadre (41) ayant une section en forme de cornière dont une branche (411) est destinée à presser la bordure (341, 36) de la coiffe (34) dans le polypropylène expansé (33) ; et des moyens de chauffage (42) au moins de ladite branche du cadre. 6. Tool (4) for attaching a cap (34) of a seat element (3) for a motor vehicle seat (1) against an expanded polypropylene sheet (33) according to the method according to any one of claims 1 to 5, characterized in that it comprises: a frame (41) having an angle-shaped section of which a branch (411) is intended to press the edge (341, 36) of the cap (34) in the expanded polypropylene ( 33); and heating means (42) at least of said frame branch. 7. Outil selon la revendication 6, comportant en outre des moyens pour presser le cadre (41) contre la plaque (33) de l'élément (3) de siège (1).B8932 - 2486 1.FR 9 7. Tool according to claim 6, further comprising means for pressing the frame (41) against the plate (33) of the element (3) of seat (1) .B8932 - 2486 1.EN 9 8. Elément (3) de siège (1) pour véhicule automobile comportant une matelassure (32) et une plaque arrière (33) en polypropylène expansé, caractérisé en ce qu'il comporte une coiffe (34) assemblée conformément au procédé selon l'une quelconque des revendications 1 à 5. 8. Element (3) of seat (1) for a motor vehicle comprising a padding (32) and a back plate (33) of expanded polypropylene, characterized in that it comprises a cap (34) assembled according to the method according to the any of claims 1 to 5. 9. Siège (1) pour véhicule automobile comportant au moins un élément (3) conforme à la revendication 8. 9. Seat (1) for a motor vehicle comprising at least one element (3) according to claim 8.
FR0854932A 2008-07-21 2008-07-21 ATTACHMENT OF A SEAT COVER FOR A MOTOR VEHICLE Expired - Fee Related FR2933895B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3032402A1 (en) * 2015-02-06 2016-08-12 Faurecia Sieges D'automobile FRONT REAR SEAT PROTECTION FOR MOTOR VEHICLE

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19500233A1 (en) * 1994-11-02 1996-05-09 Pelz Ernst Empe Werke Cladding part for interior construction, in particular of motor vehicles and method for producing a cladding part
FR2813774A1 (en) * 2000-09-12 2002-03-15 Faure Bertrand Equipements Sa Seat component includes synthetic foam padding and cover with flexible edge having thermoplastic material welded to thermoplastic material on face of another part

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19500233A1 (en) * 1994-11-02 1996-05-09 Pelz Ernst Empe Werke Cladding part for interior construction, in particular of motor vehicles and method for producing a cladding part
FR2813774A1 (en) * 2000-09-12 2002-03-15 Faure Bertrand Equipements Sa Seat component includes synthetic foam padding and cover with flexible edge having thermoplastic material welded to thermoplastic material on face of another part

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3032402A1 (en) * 2015-02-06 2016-08-12 Faurecia Sieges D'automobile FRONT REAR SEAT PROTECTION FOR MOTOR VEHICLE

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