EP0016543B1 - Verfahren zur Herstellung von Sitzkissen und so erhaltene Sitzkissen - Google Patents

Verfahren zur Herstellung von Sitzkissen und so erhaltene Sitzkissen Download PDF

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Publication number
EP0016543B1
EP0016543B1 EP19800300504 EP80300504A EP0016543B1 EP 0016543 B1 EP0016543 B1 EP 0016543B1 EP 19800300504 EP19800300504 EP 19800300504 EP 80300504 A EP80300504 A EP 80300504A EP 0016543 B1 EP0016543 B1 EP 0016543B1
Authority
EP
European Patent Office
Prior art keywords
block
covers
foam
underside
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19800300504
Other languages
English (en)
French (fr)
Other versions
EP0016543A3 (en
EP0016543A2 (de
Inventor
Trevor Charles Holdsworth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Peugeot Motor Co PLC
Original Assignee
Talbot Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Talbot Motor Co Ltd filed Critical Talbot Motor Co Ltd
Publication of EP0016543A2 publication Critical patent/EP0016543A2/de
Publication of EP0016543A3 publication Critical patent/EP0016543A3/en
Application granted granted Critical
Publication of EP0016543B1 publication Critical patent/EP0016543B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B68—SADDLERY; UPHOLSTERY
    • B68G—METHODS, EQUIPMENT, OR MACHINES FOR USE IN UPHOLSTERING; UPHOLSTERY NOT OTHERWISE PROVIDED FOR
    • B68G7/00—Making upholstery
    • B68G7/05—Covering or enveloping cores of pads

Definitions

  • This invention relates to methods of making seat cushions and is particularly although not exclusively applicable to methods of making seat cushions for seat bases and seat backs of motor vehicle seats.
  • U.S.-A-2921403 discloses a method and apparatus for making upholstery in the form of cushioning material covered with an upholstery fabric for use, inter alia on chair seats and backs.
  • the upholstery comprises foam cushions trapped between upper and lower sheets of fabric bonded together between the cushions.
  • the upholstery is manufactured in a two part die assembly having spaced cavities separated by upstanding ribs in which the cushions are located and the upper and lower sheets of fabric are anchored around their perimeters to the outer perimeter of the die.
  • the top cover is tensioned during the bonding operation in the die and, accordingly, the cushions will be compressed but the extent to which the cushions are compressed in the final product will depend very much on the manner in which the fabrics are assembled in the die and the exact dimensions of the cushions. There is no control to ensure that a certain level of tension will be maintained in the fabrics and therefore the cushions maintained in compression in the finished product.
  • the invention provides a method of making a seat cushion comprising the steps of arranging a main resilient plastics block with at least one subsidiary resilient plastics foam block which provides a perimeter part of the cushion, locating a top trim cover of heat weldable material over the intended top surface of the two blocks, locating an underside trim cover of heat weldable material under the intended underparts and around the sides of the blocks, and using a welding tool having inner and outer electrodes providing spaces to receive the foam blocks to heat weld the underside trim cover to the top cover around the perimeter of the main foam block and between the main and subsidiary foam blocks to form separate pockets between the trim covers in which the foam blocks are held, characterised in that both the covers are held resiliently in tension between the two parts of the welding tool as the welding tool closes on and seals the covers together.
  • the subsidiary block may be U-shaped and may receive, within the U, the main block.
  • the U-shaped block is formed in one piece.
  • the U-shaped block is formed in three separate pieces which are enclosed in a single pocket performed between the top and underside covers when the covers are heat welded together.
  • At least one strip of heat weldable material may be welded to the underside trim cover along the weld between the two foam blocks when the two covers are heat welded together to provide anchorage for holding the cushion in a base frame.
  • the heat sealing of the perimeter of the top cover to the underside cover may be so carried out that a head of the material is formed around the perimeter of the top trim cover.
  • the invention also provides a seat cushion manufactured by any of the above methods and mounted on a rigid base frame (25, 26) shaped to hold the top surface of the subsidiary foam block inclined upwardly from the top surface of the main block.
  • This invention relates particularly but not exclusively to motor vehicle seats and to a method of making such seats.
  • the lower portion 10 of a two-part dielectric welding tool comprises a fixed base 11 from which extends an upstanding outer electrode 12 which in plan view is of substantially rectangular shape with rounded corners.
  • the rear wall of the electrode is lower in height than the front wall, whilst the heights of the side walls changes correspondingly along their lengths between the front and rear walls such that the top edges are of arcuate form in side elevation which with the top edges of the front and rear walls correspond to the required peripheral shape of a decorative embossed simulated piping line formed in the trim cover material of a foam filled seat cushion as described later.
  • An upstanding inner electrode 13 of smaller rectangular shape in plane view than the outer electrode 12 is also formed in base 11 such that the rear wall is common to both electrodes and the remaining walls of the inner electrode 13 are of the same height therewith and are spaced from the corresponding walls of the outer electrodes 12 within the perimeter thereof.
  • the upper portion 14 of the welding tool is movable towards and away from the lower portion and comprises a base 15 oppositely parallel with base 11 formed with downwardly extending outer and inner electrodes 16, 17 respectively which in plan view are opposite to and correspond in shape to the lower outer and inner electrodes 12, 13, the heights and profiles of the upper electrodes 16, 17 being correspondingly opposite to those of the electrodes 12, 13 such that the working edges of corresponding upper and lower electrodes match when the upper portion of the welding tool is moved towards the lower portion for the required distance.
  • the working edge of the upper outer electrode 16 is formed with two spaced- apart walls, the cavity therebetween permitting extrusion of weld material therein during the welding operation to form a narrow embossed line simulating a decorative piping extending continuously around the finished seat cushion.
  • a form of electrode particularly suitable for this purpose is described in our British Patent Specification GB-A-1229891.
  • flies 18 comprising elongate strips of weldable flexible material are placed over the front and side walls of the lower inner electrode 13 such that a greater proportion of the width of each strip lies along the outer faces of its corresponding wall whilst a marginal edge portion rests on the base 11.
  • a sheet of weldable flexible backing cloth 19 is then placed over the lower portion of the welding tool such that within the perimeter of the lower outer electrode 12 the cloth is positioned to conform approximately with the contours defined by the inner surface of the base 11, the lower inner electrode and the inner face of the wall of the lower outer electrode 12.
  • a peripheral margin of the backing cloth extends outwardly of the outer electrode 12 and rests on a support surface 20 surrounding the lower portion of the welding tool level with the working edge thereof and the marginal portion of the backing cloth is secured in this position to the upper end of spaced hooks 21 pivotally mounted on the support surface 20.
  • Tension springs 21 a are connected to the lower ends of the hooks to hold the outer part of the backing cloth in tension when the welding tool closes.
  • a U-shaped block 22 of polyether foam (or other plastics foam) is positioned in the lower portion of the welding tool upon the backing cloth such that it substantially occupies the space between the outer and inner electrodes 12, 13 and projects above their working edges a predetermined amount.
  • the sectional shape of the U-shaped block 22 varies along its length to enable the desired shape of the elements of the finished seat cushion to be obtained.
  • a further polyether foam (or other plastics foam) block 23 of rectangular shape and substantially uniform thickness is positioned upon the backing cloth such that the block substantially occupies the space within the perimeter of the lower inner electrode 13 and projects above the working edge thereof by a predetermined amount.
  • a sheet of weldable flexible trim cover material 24 has a rectangular embossed area corresponding to the area defined by the perimeter of the outer electrodes of the welding tool, the material extends beyond the embossed area to form a marginal portion therewith.
  • the embossed area is formed by laminated materials comprising the trim material 24, a weldable backing cloth 24a between which is a layer of plastics foam such as polyvinyl chloride approximately 6 to 15 mm thick, which may be secured by suitable adhesive to the underside of the trim material 24.
  • Those materials are dielectrically welded together along lines corresponding in plan view and size to the shape of the outer and inner electrodes of the welding tool.
  • the central rectangular embossed panel may if desired be divided into smaller rectangular panels by additional weld lines extending transversely between the weld lines corresponding direc- tionafly with the side walls of the outer electrodes.
  • the trim cover material thus formed is placed in position over the lower portion of the weld tool such that the weld lines defining the embossed panels are in line with the inner and outer electrodes and the marginal portions of the trim material 24 are attached to hooks 21 in a similar manner to the backing cloth 19.
  • the upper portion 14 of the weld tool is then moved towards the lower portion 10 such that the electrodes apply pressure to the trim material, the backing cloth and flies between the electrodes and simultaneously dielectrically weld then together.
  • the seat cushion thus formed is removed from the welding tool and the marginal portion of the backing cloth and trim material are suitably finished and extended downwardly against the main part of the backing cloth and secured thereto by suitable means to form the side covers of the seat cushion.
  • a seat support structure which in this particular embodiment comprises a metal rectangular pan 25 with a base having an upwardly forwardly sloping portion 26 at the front thereof extending transversely substantially the width of the base.
  • a large rectangular aperture 27 is formed in the base rearwardly of the sloping portion such that the forward and side edges of the aperture are approximately in line with the flies 18 extending downwardly from the base of the seat cushion. The flies are pulled through the aperture and turned around the edges thereof to lie against the underside of the seat pan to which they are secured by a suitable number of screws engaging into spaced holes in the seat pan base.
  • Suitable washers are interposed between the flies and the underside of the heads of the screws to reduce any strain on the material of the flies.
  • a number of resilient straps 28 extend transversely across the aperture 27 and are attached at their ends to the seat pan base in a manner known per se.
  • the polyether foam blocks may be shaped by cutting or moulding, whilst a number of separate blocks of suitable shape may be substituted for the integral U-shaped block 23.
  • the seat support structure may be of different construction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)
  • Seats For Vehicles (AREA)

Claims (7)

1. Verfahren zur Herstellung eines Sitzpolsters, bei dem ein elastischer Haupt-Kunststoff-Schaumstoffblock (23) mit wenigstens einem zusätzlichen elastischen Konststoff-Schaumstoffblock (22) angeordnet wird, der einen Umfangsteil des Sitzes bildet, bei dem eine obere dekorative Abdeckung (24) aus einem mittels Wärme schweißbaren Material auf der beabsichtigten Oberseite der beiden Blöcke angeordnet wird, bei dem eine untere dekorative Abdeckung (19) aus durch Wärme schweißbarem Material an den beabsichtigten unteren Teilen und über den Seiten der Blöcke angeordnet wird, und bei dem ein Schweißwerkzeug (10, 14) mit inneren (13, 17) und äußeren (12, 16) Elektroden verwendet wird, die Räume zur Aufnahme der Schaumstoffblöcke bilden, um die untere Abdeckung mit der oberen Abdeckung am Umfang des Hauptschaumstoffblocks und zwischen dem Hauptblock und dem zusätzlichen Block zu verschweißen und gesonderte Taschen zwischen den Abdeckungen zu bildren, in denen die Schaumstoffblöcke gehalten werden, dadurch gekennzeichnet, daß beide Abdeckungen (19, 24) zwischen den beiden Teilen (10, 14) des Schweißwerkzeugs elastisch unter Spannung (21, 21 a) gehalten werden, wenn das Schweißwerkzeug an den Abdeckungen geschlossen wird und diese schweißt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der zusätzliche Block (22) U-förmig ist und innerhalb der U-Form den Hauptblock (23) aufnimmt.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der U-förmige Block (22) einstückig ausgebildet ist.
4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der U-förmige Block (22) aus drei gesonderten Teilen besteht, die in einer einzigen Tasche aufgenommen sind, die zwischen der oberen und der unteren Abdeckung (24, 19) gebildet wird, wenn die Abdeckungen miteinander verschweißt werden.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß wenigstens ein Streifen (10) aus einem durch Wärme schweißbaren Material mit der unteren Abdeckung längs der Schweißverbindung zwischen den beiden Schaumstoffblöcken verschweißt wird, wenn die beiden Abdeckungen miteinander verschweißt werden, um Befestigungselemente zum Halten des Polsters in einem Grundrahmen zu bilden.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Verschweißung des Umfangs der oberen Abdekkung (24) mit der unteren Abdeckung (19) derart durchgeführt wird, daß ein Materialwulst um den Umfang der unteren Abdeckung gebildet wird.
7. Sitzpolster, dadurch gekennzeichnet, daß es nach einem der Ansprüche 1 bis 6 hergestellt und auf einem starren Grundrahmen (25, 26) befestigt ist, der so geformt ist, daß er die Oberseite des zusätzlichen Schaumstoffblockes von der Oberseite des Hauptblockes aus nach oben geneigt hält.
EP19800300504 1979-03-19 1980-02-21 Verfahren zur Herstellung von Sitzkissen und so erhaltene Sitzkissen Expired EP0016543B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7909570A GB2053082A (en) 1979-03-19 1979-03-19 Method of making seat cushions
GB7909570 1979-03-19

Publications (3)

Publication Number Publication Date
EP0016543A2 EP0016543A2 (de) 1980-10-01
EP0016543A3 EP0016543A3 (en) 1980-10-15
EP0016543B1 true EP0016543B1 (de) 1983-06-01

Family

ID=10503968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800300504 Expired EP0016543B1 (de) 1979-03-19 1980-02-21 Verfahren zur Herstellung von Sitzkissen und so erhaltene Sitzkissen

Country Status (3)

Country Link
EP (1) EP0016543B1 (de)
DE (1) DE3063567D1 (de)
GB (1) GB2053082A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8721581D0 (en) * 1987-09-14 1987-10-21 Fabrex Ltd Fabric to fabric bonding

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921403A (en) * 1956-07-20 1960-01-19 George R Cunnington Upholstery making
FR1527048A (fr) * 1967-04-14 1968-05-31 Soudexvinyl Sa Procédé pour réaliser un passepoil sur un article de sellerie en matière plastique, dispositif pour mettre en oeuvre ce procédé et article réalisé

Also Published As

Publication number Publication date
GB2053082A (en) 1981-02-04
EP0016543A3 (en) 1980-10-15
EP0016543A2 (de) 1980-10-01
DE3063567D1 (en) 1983-07-07

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