EP2997856B1 - Garniture de siege - Google Patents

Garniture de siege Download PDF

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Publication number
EP2997856B1
EP2997856B1 EP15184572.4A EP15184572A EP2997856B1 EP 2997856 B1 EP2997856 B1 EP 2997856B1 EP 15184572 A EP15184572 A EP 15184572A EP 2997856 B1 EP2997856 B1 EP 2997856B1
Authority
EP
European Patent Office
Prior art keywords
frame
surface element
backrest
chair according
seat
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.)
Active
Application number
EP15184572.4A
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German (de)
English (en)
Other versions
EP2997856A1 (fr
Inventor
Dietmar Fissl
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.)
Sitag AG
Original Assignee
Sitag AG
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 Sitag AG filed Critical Sitag AG
Priority to PL15184572T priority Critical patent/PL2997856T3/pl
Publication of EP2997856A1 publication Critical patent/EP2997856A1/fr
Application granted granted Critical
Publication of EP2997856B1 publication Critical patent/EP2997856B1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/28—Seat parts with tensioned springs, e.g. of flat type
    • A47C7/282—Seat parts with tensioned springs, e.g. of flat type with mesh-like supports, e.g. elastomeric membranes
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back

Definitions

  • the invention relates to a chair according to the preamble of claim 1.
  • the backrest and the seat of chairs are often provided with a textile covering.
  • the fabric may be formed as a coating which is pulled over a clamping frame of the backrest.
  • the clamping frame is made in two parts and the fabric is clamped between the two frame parts.
  • the covering gives the chair user a pleasant resilient backrest function and adapts to the back of the user, but also has some disadvantages.
  • the installation of the clothing in the clamping frame is relatively expensive, since a circumferential retaining element or a piping, for example a plastic profile, must be fastened to the fabric edge, so that the clothing is reliably held between the frame parts.
  • the fabric quickly soils and is difficult to clean because it is not removable in the other embodiment.
  • Such Lehnenbetent shows, for example, the DE 10 2009 036 958 A1 ,
  • the fabric is attached to the backrest frame also on cross members to give the backrest cover a shape that is adapted to the back of a user.
  • a seat cushion element which has a sprung surface of a first thermoplastic material.
  • the surface has on opposite sides fastening elements for mounting on a frame.
  • the fastening elements have an overmolded area and are made of a second thermoplastic material which forms a chemical bond with the first thermoplastic material.
  • a backrest is shown to improve seating comfort.
  • vertically oriented ribs are formed, which are interrupted by vertical elongated slots.
  • the vertical rows of slots, which are separated from the ribs, are vertically offset from one another. In the middle area, the ribs are larger and therefore stiffer.
  • the backrest is connected to 4 retaining points with a form-fitting backrest frame.
  • the breakpoints are realized in that cylindrical extensions of retaining claws are included. The preparation of these forms is complicated and the breakpoints run the risk of being torn at higher load.
  • the crooked retaining claws also tend to be dirty and are difficult to clean.
  • a chair is described with a frame and a string stretched on the frame.
  • the fabric is attached to the frame with a plurality of separate support members.
  • the holding elements are designed as a first and second latching element, which are locked together with each other in different length positions.
  • the first locking elements are attached to the chair cover and the second locking elements on the frame.
  • the tension of the clothing can be adjusted by the different locking positions to the needs of the chair user.
  • the first and second locking elements must be attached to both stringing and frame.
  • the Verrastungszähne provide investment points for contamination.
  • WO 2010/068122 A1 discloses an office chair with a back frame and a back cover suspendable in the back frame.
  • the back cover is preferably injection molded.
  • the back cover has holding webs on its edges, which can be suspended in retaining elements of the back frame.
  • a method is known with which a chair cover is injection-molded.
  • the chair cover has fasteners at its edge.
  • the fasteners have undercuts and require for producing a corresponding injection mold.
  • Object of the present invention is to provide a chair with a fabric, which fabric is cheaper to produce than known fabrics, is quickly connected to the tenter of the chair and also easy to clean.
  • a chair in particular an office chair comprises a seat element, a backrest and a support frame, on which the seat element and the backrest are arranged.
  • the backrest and / or the seat element are formed by a back frame or a seat frame and a spanned on the back frame and / or the seat frame surface element.
  • the time-consuming step of fastening the cedar can be completely dispensed with. Since the surface element is produced by injection molding, its production is particularly fast, since the injection molding process has high cycle rates. It is also not necessary to cut textile surface webs because the surface element leaves the mold with high imaging accuracy.
  • the fasteners are made of the full all-round edge.
  • the fastening elements are formed by the fact that a circumferential web, which is formed on the outer edge of the surface element, is reworked.
  • the fasteners are therefore made of a cast with the surface element and accordingly stable.
  • the injection mold for the production of the surface element can be designed simply as a continuous edge is sufficient. The manufacturing costs of the injection mold can therefore be significantly reduced compared to injection molds in which fasteners are poured out. Furthermore, a closed edge is easier to demould than individually shaped fasteners.
  • the subsequent processing of the full edge can lead to a surface element in which the fastening elements may preferably have different widths.
  • the injection-molded surface element can therefore have different biases at certain points due to the different widths of the fastening elements when it is clamped in the seat frame or the back frame. It is also advantageous that an injection mold can be used for all surface elements, regardless of the width of the fastening elements.
  • the surface element is integrally formed with the plurality of fasteners. An attachment of fasteners in a time-consuming further production step is therefore not necessary.
  • the fastening elements are formed as hooks which are suspended in the fuselage frame and / or in the seat frame.
  • the hooks can be cut out of the surface element, but can also be poured together with the remaining surface element.
  • the hooks are formed as a part of the surface element and therefore can not be detached from the surface element.
  • backrest frame and / or the seat frame into which the fastening elements of the surface element latch.
  • An attachment of the sheet material to the back frame can therefore be done very quickly by hooking.
  • Backrest frame and surface element are both preferably produced by injection molding and work together accurately without having to be reworked after removal from the mold. Furthermore, the attaching step of hooking is easy and quick to do.
  • the surface element is biased to advantage on the back frame and / or on the seat frame, resulting in a reliable connection between the back frame and surface element.
  • the fasteners are under tension and can not slip out of the back frame. It would be possible to additionally secure the fasteners, for example by screws.
  • the bias causes a width expansion between 3% and 10% and preferably between 5% and 8% of the surface element.
  • This expansion under prestressing is made possible by the elastic thermoplastic polyurethane.
  • the expansion can be influenced by the shape and size of the passages of the surface element.
  • An expansion in the claimed area causes sufficient bias in a still existing resilient effect of the backrest.
  • the surface element is stretched on the back frame only in the horizontal direction, ie along the width dimension. It is also conceivable, of course, a bias in the vertical direction.
  • the dimensions of the width of the stress-free surface element between 3% and 10% and preferably between 5% and 8% smaller than the width dimension of the back frame, whereby the surface element is biased in the horizontal direction on the back frame.
  • the vote of the dimension of the back frame and the dimension of the surface element lead to a defined bias of the surface element.
  • the advantageous material of the surface element which is a thermoplastic polyurethane (TPU)
  • TPU thermoplastic polyurethane
  • the chair according to the invention is therefore very well suited for applications in which high hygienic standards are required. These include, for example, the medical sector and the food-producing sector.
  • the surface element with the plurality of fastening elements is a one-piece injection-molded part.
  • at least one production step can be saved with a single part, which comprises surface element and holder.
  • the surface element has the shape of a network with network passages and network webs.
  • the net shape allows a flexible, stretchable surface element, which is nevertheless stable.
  • the extent of elasticity can be influenced.
  • the carrying capacity of different areas of the clamped surface element by the strength and the length of the web webs and the measure of the bias is adjustable.
  • the selective control of the degrees of hardness makes it possible for the backrest, for example, in the shoulder area, to have a different hardness than in the lordosis area.
  • the passages of the network are polygonal and preferably hexagonal. This results in a honeycomb structure, since the 6 polygons divide webs. At the edges of the surface element, the polygons may also have a different number of corners in order to provide the surface element as full as possible with passages.
  • the fastening elements are made of solid.
  • the fastening elements are formed by the fact that a circumferential web, which is formed on the outer edge of the surface element, is reworked.
  • the fasteners are therefore made of a cast with the surface element and accordingly stable.
  • the passages at the edge of the surface element have the shape of uniform polygons and have the center of the surface element, at predefined locations, a shape in which at least one diagonal is shorter than the remaining diagonals.
  • the ridges of the polygons, which have a shorter diagonal, are easier to expand.
  • the extensibility of the surface element can be increased or reduced at predefined points by the shape of the polygons or their webs.
  • the shorter diagonals of the passages are oriented in the clamping direction of the surface element. This orientation of the diagonals allows the surface element to expand more easily in one direction, thereby facilitating clamping onto the back frame.
  • the hooks facing the back frame or the seat frame and close with the surface element an angle between 20 degrees and 80 degrees, preferably between 30 degrees and 70 degrees, and more preferably between 40 degrees and 60 degrees.
  • the provision of an acute angle allows the hook to grip the back frame like a claw.
  • the back frame or the seat frame comprises a clamping frame for mounting the surface element and a holding frame, with which the clamping frame is connected.
  • This embodiment has the advantage that the fastening elements are prevented from being released from the holding frame by the clamping frame.
  • the combination of support frame and clamping frame increase the stability of the Lehenrahmens or the seat frame.
  • Holding frame and clamping frame can be connected with positive locking, for example, screw or clamp connections.
  • the TPU has a tensile strength between 10 and 25 MPa (megapascals), preferably between 15 and 20 MPa and particularly preferably between 17 and 19 MPa.
  • This tensile strength ensures that the panel can support the weight of a user of the chair and does not break.
  • a tensile strength allows a certain extensibility, so that the surface element can be clamped in the backrest frame.
  • the invention relates to a chair, in particular an office chair, which conventionally comprises a seat element and a backrest, which are arranged on a support frame.
  • the support frame can be equipped with a roller frame.
  • the backrest is formed by a backrest frame and a surface element 11 clamped on the backrest frame.
  • the back frame is according to the embodiment of FIGS. 4 to 9 executed in two parts. It comprises a clamping frame 13 and a holding frame 15 which is connected to the clamping frame 13. The surface element 11 is clamped on the clamping frame 13 by being hooked to this. Then, the clamping frame 13 is screwed to the holding frame 15, so that the surface element 13 from the clamping frame 13 can not unhook.
  • the surface element 11 is injection-molded from a thermoplastic polyurethane, preferably a thermoplastic polyester-polyurethane.
  • a thermoplastic polyurethane preferably a thermoplastic polyester-polyurethane.
  • This material is characterized by its good processability by injection molding, its high imaging accuracy, its high stability and its ductility.
  • the thermoplastic polyester-polyurethane has a tensile strength of 18 MPa (megapascals).
  • fasteners are mitausgeformt in the form of a running in the direction of the clamping frame 13 at an acute angle leg in one piece. The leg can be formed around the edge of the surface element 11.
  • the surface element 11 is thus made with the leg of a cast. From the leg a plurality of hooks 17 are formed by these are formed from the solid.
  • leg gaps 19 are cut at uniform intervals, whereby the remaining leg parts transform into hooks 17.
  • the gaps 19 may also have different distances, creating hooks 17 with different widths. This is particularly advantageous if the surface element at different points of the clamping frame 13 to have different biases. It is also conceivable to mold the hooks already during injection molding. However, this means a complex mold, since for each hook 17 a negative impression must be provided in the injection mold.
  • the surface element 11 has the shape of a network with a plurality of polygonal openings 21 and net passages and the webs 25 separating the openings.
  • the openings 21 vary in their shape, depending on which point of the surface element they are provided. If the surface element 11 has an improved extensibility at one point, openings 21 with an enlarged surface are provided at this point, which may additionally have diagonals of different lengths. If the openings 21 are positioned with their shortened diagonal in the clamping direction, the extensibility of the surface element in the clamping direction is improved.
  • the shape of the openings 21 makes it possible to improve or reduce the extensibility of the surface element at predefined locations.
  • the strength and length of the mesh webs 25 also contributes to the extensibility and load-bearing capacity of the planar element 11.
  • the surface element 11 is clamped on the clamping frame 13.
  • the hooks 17 are pulled over the edge 23 of the clamping frame 13 and hooked on this. It is also possible that a plurality of through openings are provided on the clamping frame 13, in which the hooks 17 of the surface element 11 engage.
  • the surface element 11 is biased by the latching of the hook 17 on the clamping frame.
  • the relaxed surface element on the clamping frame 13 is biased or expanded by 5 to 8% in the longitudinal and transverse directions. Since the thermoplastic polyester-polyurethane is elastic, results in the backrest a slightly resilient effect similar to a trampoline.
  • the hooks 17 close with the plane of the surface element 11 at an acute angle, which is preferably about 60 degrees. Due to the acute angle, the surface element 11 is reliably hooked to the clamping frame. Thus, the hooks 17 can not bend and the backrest has improved stability, the clamping frame 13th received in the holding frame 15.
  • the outer edge of the clamping frame 13 and the inner edge of the holding frame are formed such that they fit flush with each other. This interaction of the two frames 13, 15 prevents the hooks 17 from bending and releasing from the clamping frame 13, since the hooks 17 abut on the holding frame 15.
  • the frames are screwed together or hooked together by means of clips. It is also conceivable that the backrest frame is in one piece.

Landscapes

  • Chair Legs, Seat Parts, And Backrests (AREA)

Claims (13)

  1. Chaise, en particulier chaise de bureau, avec
    - un élément de siège,
    - un dossier,
    - un châssis porteur sur lequel sont placés l'élément de siège et le dossier, cependant que le dossier et/ou l'élément de siège sont formés par un cadre de dossier ou un cadre de siège et un élément de surface (11) tendu sur le cadre de dossier et/ou le cadre de siège et
    - une multitude d'éléments de fixation (17), travaillés à partir du bord plein sur tout le pourtour pour la fixation au cadre de dossier et/ou au cadre de siège, qui sont moulés sur le bord de l'élément de surface (11) et qui forment avec l'élément de surface une unité moulée par injection en une pièce,
    caractérisée en ce que le cadre de dossier ou le cadre de siège comprend un cadre de tension (13) pour tendre l'élément de surface (11) et un (15) cadre de maintien auquel le cadre de tension est relié.
  2. Chaise selon la revendication 1, caractérisée en ce que les éléments de fixation (17) présentent différentes largeurs.
  3. Chaise selon l'une des revendications précédentes, caractérisée en ce que les éléments de fixation sont moulés comme des crochets (17) qui sont suspendus dans le cadre de dossier et/ou dans le cadre de siège.
  4. Chaise selon l'une des revendications précédentes, caractérisée en ce qu'une multitude d'ouvertures de passage sont prévues sur le cadre de dossier et/ou le cadre de siège dans lesquelles les éléments de fixation de l'élément de surface (11) s'enclenchent.
  5. Chaise selon l'une des revendications précédentes, caractérisée en ce que l'élément de surface (11) est précontraint sur le cadre de dossier et/ou sur le cadre de siège.
  6. Chaise selon la revendication 5, caractérisée en ce que la précontrainte provoque une extension en largeur entre 3% et 10% et de préférence entre 5% et 8% de l'élément de surface (11).
  7. Chaise selon l'une des revendications précédentes, caractérisée en ce que les dimensions en largeur de l'élément de surface sans tension (11) sont entre 3% et 10%, et de préférence entre 5% et 8% plus petites que les dimensions en largeur du cadre de dossier si bien que l'élément de surface (11) est précontraint dans le sens horizontal sur le cadre de dossier.
  8. Chaise selon l'une des revendications précédentes, caractérisée en ce que l'élément de surface (11) est constitué en un polyuréthane thermoplastique (TPU).
  9. Chaise selon l'une des revendications précédentes, caractérisée en ce que l'élément de surface (11) avec la multitude d'éléments de fixation (17) est un élément moulé par injection en une pièce.
  10. Chaise selon la revendication 10, caractérisée en ce que l'élément de surface (11) a la configuration d'un filet avec des passages de filet (21) et des traverses de filet (25).
  11. Chaise selon la revendication 10, caractérisée en ce que la capacité porteuse de différentes zones de l'élément de surface tendu (11) est ajustable par l'épaisseur et la longueur des traverses de filet (25) ainsi que le niveau de la précontrainte.
  12. Chaise selon l'une des revendications 3 à 11, caractérisée en ce que les crochets (17) sont tournés vers le cadre de dossier ou le cadre de siège et forment avec l'élément de surface (11) un angle entre 20 degrés et 80 degrés, de préférence entre 30 degrés et 70 degrés et de manière particulièrement préférée entre 40 degrés et 60 degrés.
  13. Chaise selon l'une des revendications précédentes, caractérisée en ce que le TPU a une résistance à la traction entre 10 et 25 MPa, de préférence entre 15 et 20 MPa et de manière particulièrement préférée entre 17 et 19 MPa.
EP15184572.4A 2014-09-19 2015-09-10 Garniture de siege Active EP2997856B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15184572T PL2997856T3 (pl) 2014-09-19 2015-09-10 Obicie krzesła

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH01415/14A CH710131B1 (de) 2014-09-19 2014-09-19 Stuhl.

Publications (2)

Publication Number Publication Date
EP2997856A1 EP2997856A1 (fr) 2016-03-23
EP2997856B1 true EP2997856B1 (fr) 2017-05-17

Family

ID=51932148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15184572.4A Active EP2997856B1 (fr) 2014-09-19 2015-09-10 Garniture de siege

Country Status (3)

Country Link
EP (1) EP2997856B1 (fr)
CH (1) CH710131B1 (fr)
PL (1) PL2997856T3 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1170073A (en) * 1966-02-23 1969-11-12 Pirelli Ltd Upholstery Supports
US3767261A (en) * 1971-03-22 1973-10-23 D Rowland Seating and sub-assembly for seats and backs and method for making same
BE1014711A3 (nl) * 2002-03-19 2004-03-02 Boschman Frank Zitmeubel.
CA2669068A1 (fr) * 2006-11-10 2008-05-15 Okamura Corporation Dispositif de dossier pour fauteuil
WO2009116033A1 (fr) * 2008-03-17 2009-09-24 Keter Plastic Ltd. Meuble et son mécanisme de fixation
US9003635B2 (en) * 2008-04-08 2015-04-14 Formway Furniture Limited Injection moulding method
AU2009325216B2 (en) * 2008-12-12 2015-12-10 Formway Furniture Limited A chair, a support, and components
FR2940029B1 (fr) * 2008-12-18 2011-02-25 Comatel Casuel Element de fond d'assise pour siege
DE102009036958A1 (de) 2009-08-11 2011-02-17 Interstuhl Büromöbel GmbH & Co. KG Rückenlehne für einen Stuhl
DE102012001082A1 (de) * 2012-01-20 2013-07-25 Klöber GmbH Rückenlehne für ein Sitzmöbel

Also Published As

Publication number Publication date
PL2997856T3 (pl) 2017-10-31
CH710131A1 (de) 2016-03-31
EP2997856A1 (fr) 2016-03-23
CH710131B1 (de) 2018-04-30

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