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EP0279354B1 - Adjustable backrest - Google Patents

Adjustable backrest Download PDF

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Publication number
EP0279354B1
EP0279354B1 EP88101995A EP88101995A EP0279354B1 EP 0279354 B1 EP0279354 B1 EP 0279354B1 EP 88101995 A EP88101995 A EP 88101995A EP 88101995 A EP88101995 A EP 88101995A EP 0279354 B1 EP0279354 B1 EP 0279354B1
Authority
EP
European Patent Office
Prior art keywords
pressure plate
backrest
shaft
deformable
fastened
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 - Lifetime
Application number
EP88101995A
Other languages
German (de)
French (fr)
Other versions
EP0279354A1 (en
Inventor
Paul Gerhard Kemmann
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.)
Kemmann & Koch
Original Assignee
Kemmann & Koch
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 Kemmann & Koch filed Critical Kemmann & Koch
Priority to AT88101995T priority Critical patent/ATE74726T1/en
Publication of EP0279354A1 publication Critical patent/EP0279354A1/en
Application granted granted Critical
Publication of EP0279354B1 publication Critical patent/EP0279354B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A47C7/36—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/46—Supports for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
    • A47C7/462—Supports for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs adjustable by mechanical means

Definitions

  • the invention relates to an adjustable backrest of a chair, armchair or the like according to the preamble of claim 1.
  • a backrest of this type is known from DE-A-29 35 352, the pressure plate being deformed by means of ropes which are fastened at different points on the pressure plate and are tensioned via separate adjusting devices.
  • the ropes running in a tendon shape to the curved pressure plate require a relatively large amount of space in the backrest.
  • a pressure plate articulated in a backrest is also known, which is deformable by a bracket which can be pivoted by a lever which can be actuated from the outside. In this case too, a certain amount of space is required due to the pivoting range of the bracket.
  • the invention has for its object to design an adjustable backrest of the type specified so that the ergonomic design of the backrest can be better adapted to the respective requirements of the user.
  • 1 denotes the backrest and 2 the seat of an armchair, wherein the backrest 1 can be arranged rigidly relative to the seat 2 or the inclination can be adjusted via a joint indicated schematically at 3.
  • a pressure plate 5 which consists of a deformable material and can be deformed and adjusted relative to the contact surface 4 by an adjusting device, is arranged in the contact surface 4 of the backrest 1 approximately at the level of the kidneys in the central region.
  • the pressure plate 5 is covered by the upholstery fabric 6 or padding of the backrest 1 so that it is not visible from the outside.
  • the pressure plate 5 can be pivoted about an axis indicated in FIG. 1 and 2 at 7, for example by means of a rotary knob 8, which is accessible outside the backrest.
  • FIG. 3a shows a view of a printing plate 5, which consists, for example, of a deformable plastic plate, which is provided with cuts 9 for easier deformability over most of its height dimension, so that individual resilient lamellae 10 result, which rest against the cover material 6, as shown in FIG.
  • the pressure plate 5 or the lamellae 10 can be preformed in the shape shown in FIG. 4 with a certain curvature.
  • Fig. 3b shows a front view of a pressure plate 5, which is rotatable on the lower edge portion about the axis 7 and is provided on the upper portion with two perpendicular to the axis 7, parallel guide slots 9 ', which in contrast to the incisions 9 closed at the upper edge are. Brackets 29, as shown in FIG. 6, engage in these incisions 9 or guide slots 9..
  • the pressure plate 5 is designed such that it is stiff or less easily preformable in the lower section adjacent to the pivot axis 7, while it is flexible or easier to deform in the remaining area up to the upper edge.
  • a material is preferably selected which has resilient properties. This different deformability over the height of the pressure plate can be achieved by the lamella formation indicated in FIG. 3a or also in that the pressure plate 5 has a certain thickness in the lower section and becomes increasingly thinner in the direction of the upper edge.
  • the pressure plate 5 has, for example, a constant thickness, and it is fastened in the lower section to a correspondingly shaped flat section 11 of a swivel part 12, which is fixed in the backrest 1 and can be pivoted about the axis 7 .
  • the swivel part 12 can be provided with a shaft 13 schematically indicated in FIG. 1, which is rotatably mounted in bearings 14 which are fastened in the rigid part of the backrest 1.
  • This shaft 13 can be connected on the outside to a rotary knob 8, which is displaceable in the axial direction relative to the shaft 13 and spring-loaded, so that a locking device, not shown, can be provided between the rotary knob 8 and the backrest 1, so that the Pivotal position of the shaft 13 can be set in the respective positions.
  • a support indicated in FIG. 4 at 27 can be provided for the free edge of the pressure plate 5, wherein this support 27 can be part of the frame of the backrest 1.
  • this support 27 the upper free edge is held in the pivoting direction when pivoting the pivoting part 12 or the lower portion of the pressure plate 5, so that the free edge only moves somewhat along the plane of this support 27, while the central portion of the pressure plate 5 in its curvature is changed.
  • the elongated holes 9 ⁇ in Fig. 3b with projections on the back of the support plate 27 are engaged. This prevents the free edge of the pressure plate 5 from moving so far downward relative to the lower edge of the support plate 27 that it can detach itself from this support.
  • a stop is formed for the curvature of the pressure plate to the outside.
  • a swivel part 12 made of sheet metal or plastic is provided, which is pivotably mounted with its swivel axis 7 on a support 21 which is fastened, for example, in the frame of the backrest 1.
  • This pivoting part 12 is provided with two lateral support arms 26, on which the pressure plate 5 rests or is fastened and which correspond to section 11 in FIG. Between these support arms 26, a curve section 22 is formed, which bears against a nut 23 is supported in a rotationally fixed manner on the carrier 21 via a stop 24 and is adjustable along a threaded spindle 25 which is rotatably mounted in the carrier 21 and is connected to a rotary knob 8.
  • the nut 23 is displaced in the axial direction of the threaded spindle, the pivot part 12 being pivoted via the curve section 22. It is also possible to provide an engaging part, for example a groove, on the curve section, which engages with a corresponding engaging part, for example a pin, on the nut 23, so that there is no spring action for the pivoting movement of the pivoting part 12 about the axis 7 the pivot part 12 is required. Usually, however, the elasticity of the cover fabric is sufficient to reset the pivoting part 12 or the pressure plate 5.
  • FIG. 6 shows an embodiment corresponding to FIG. 5, one or more brackets 29 being screwed into the wooden frame 28 of the backrest 1, each having a shaft and a widened head 30.
  • this holder engages in one of the slot-like incisions 9 or the elongated holes 9 ⁇ of the pressure plate 5, while the widened head part 30 engages over the lateral edges of the incision 9 or the adjacent slats 10.
  • the upper edge of the pressure plate 5 is held against the wooden frame 28 of the backrest 1, while the lower portion of the pressure plate can be curved further outwards.
  • the pressure plate 5 shown in FIG. 6 consists of a plastic plate with the same thickness throughout, the incisions 9 extending approximately over the upper third of the plate height.
  • the pressure plate 5 is preformed in the approximately S-shaped side view shown in FIG. 6, it being additionally possible for a curvature to be preformed perpendicular to the plane of the drawing, as indicated by the dashed lines. But it is also possible to provide a flat plate 5 in the relaxed state.
  • the pivoting part 12 comprises an angle iron, on the one leg of which the curve section 22 is formed, while the support arms 26 are fastened to the other leg.
  • the pressure plate 5 is fastened with the lower edge to the swivel part 12, wherein in the swivel position of the pressure plate 5 shown in FIG. 6 the support arms 26 are not yet in contact with the pressure plate, which is initially curved outwards only by swiveling the swivel part 12. With a greater curvature outwards, the support arms 26 come to rest on the pressure plate 5.
  • the carrier 21 is fastened with extensions 20 in an opening in the wooden frame 28, as shown in FIGS. 6 and 7a.
  • the axis 7 and the threaded spindle 25 are arranged one above the other in the carrier 21.
  • the threaded spindle 25 is followed by a flexible shaft section 31, to which a rigid shaft 32 is fastened, which is rotatably mounted at 14 on the frame of the backrest.
  • Fig. 7b shows the relaxed position of the pressure plate 5.
  • the knob 8 By turning the knob 8 clockwise, the nut 23 is moved to the left in Fig. 7b, whereby the pivot member 12 is pivoted outward through the curve portion 22 and thereby the pressure plate 5 is arched, as Fig. 6 shows.
  • FIG. 8 shows an embodiment of the fastening of the rotary knob 8 to the shaft 32, which has a slot 33 running in the axial direction at the engagement end.
  • This slotted end of the shaft 32 projects into a bore 34 in the frame 28 of the backrest.
  • a cover and bearing sleeve 35 is inserted into the bore 34 and fastened to the frame 28 by means of screws on a flange section.
  • the sleeve 35 has a centering section 36 for centering the shaft 32.
  • the rotary knob 8 is then plugged on, which is provided with a hub 37 provided with an inner bore.
  • a pin 38 which engages in the slot 33 of the shaft 32, leads across the bore of the hub 37.
  • a spring ring 39 is arranged in an annular groove, which engages with the inner circumference of the sleeve 35 and holds the rotary knob 8. This device simplifies assembly.
  • Fig. 7 shows a simple connection of the rotary knob 8 with the shaft 32 by means of a cross pin.
  • the lower edge of the pressure plate 5 is attached to the swivel part 12 facilitates the return movement of the pressure plate into the relaxed, flat starting position.
  • the pressure plate 5 is made of an elastic material.
  • the nut 23 is supported in FIG. 6 directly on the inside of the carrier 21 to prevent rotation.
  • the adjusting device for pivoting the pressure plate can also be designed in a different way.
  • the shaft 13 indicated in FIG. 1, which corresponds to the shaft 25, 32 in FIG. 7, can be connected directly to the pressure plate 5 in order to adjust it.
  • This pin or the nut can be connected to a rod which leads parallel to the shaft 13 and which is connected to an adjusting lever. By pivoting the adjusting lever, the shaft 13 can be pivoted over the helical groove and thus the pressure plate 5 can be adjusted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Chairs Characterized By Structure (AREA)

Abstract

Disclosed is an adjustable chair backrest having a frame and deformable material covering one side of the frame. A pressure having a rigid lower portion and an elastically deformable upper portion is mounted on a cam. The plate and cam pivot about an axis in response to rotation of a spindle to cause outward movement of the deformable material.

Description

Die Erfindung betrifft eine verstellbare Rückenlehne eines Stuhls, Sessels oder dergleichen nach dem Oberbegriff des Anspruchs 1.The invention relates to an adjustable backrest of a chair, armchair or the like according to the preamble of claim 1.

Eine Rückenlehne dieser Art ist aus DE-A-29 35 352 bekannt, wobei die Druckplatte über Seile verformt wird, die an verschiedenen Stellen der Druckplatte befestigt sind und über getrennte Verstelleinrichtungen gespannt werden. Die sehnenförmig zu der gekrümmten Druckplatte verlaufenden Seile benötigen relativ viel Platz in der Rückenlehne.A backrest of this type is known from DE-A-29 35 352, the pressure plate being deformed by means of ropes which are fastened at different points on the pressure plate and are tensioned via separate adjusting devices. The ropes running in a tendon shape to the curved pressure plate require a relatively large amount of space in the backrest.

Aus FR-A-1 527 147 ist ferner eine in einer Rückenlehne angelenkte Druckplatte bekannt, die durch einen Bügel verformbar ist, der durch einen von außen betätigbaren Hebel verschwenkt werden kann. Auch in diesem Falle ist durch den Schwenkbereich des Bügels ein gewisser Platzbedarf erforderlich.From FR-A-1 527 147 a pressure plate articulated in a backrest is also known, which is deformable by a bracket which can be pivoted by a lever which can be actuated from the outside. In this case too, a certain amount of space is required due to the pivoting range of the bracket.

Der Erfindung liegt die Aufgabe zugrunde, eine verstellbare Rückenlehne der eingangs angegeben Art so auszubilden, daß die ergonometrische Gestaltung der Rückenlehne an die jeweiligen Erfordernisse des Benutzers besser angepaßt werden kann.The invention has for its object to design an adjustable backrest of the type specified so that the ergonomic design of the backrest can be better adapted to the respective requirements of the user.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale im kennzeichnenden Teil des Anspruchs 1 gelöst. Dadurch, daß an dem Schwenkteil ein Kurvenabschnitt ausgebildet ist, an dem die Mutter auf der Spindel anliegt, kann die Verstelleinrichtung sehr kompakt ausgebildet werden.This object is achieved by the features in the characterizing part of claim 1. The fact that a curve section is formed on the pivot part, on which the nut lies on the spindle, the adjustment device can be made very compact.

Vorteilhafte Ausgestaltungen der Erfindung sind in den weiteren Ansprüchen angegeben.Advantageous embodiments of the invention are specified in the further claims.

Beispielsweise Ausführungsformen der Erfindung werden nachfolgend anhand der Zeichnung näher erläutert. Es Zeigen

Fig. 1
schematisch eine Vorderansicht eines Stuhles,
Fig. 2
eine Seitenansicht des Stuhles,
Fig.3a,b
Vorderansichten einer Druckplatte,
Fig.4
eine schematische Seitenansicht der Druckplatte mit einem Teil der Verstelleinrichtung,
Fig. 5
in perspektivischer, vereinfachter Darstellung eine Verstelleinrichtung,
Fig. 6
eine Seitenansicht mit einem Teilschnitt einer praktischen Ausführungsform der Verstelleinrichtung nach Fig. 5,
Fig. 7a
eine Vorderansicht der Verstelleinrichtung nach Fig. 6 und Fig. 7b eine Draufsicht auf diese Verstelleinrichtung, und
Fig. 8
die Befestigung des Verstell- bzw. Drehknopfes.
For example, embodiments of the invention are explained in more detail below with reference to the drawing. Show it
Fig. 1
schematically a front view of a chair,
Fig. 2
a side view of the chair,
3a, b
Front views of a printing plate,
Fig. 4
2 shows a schematic side view of the pressure plate with part of the adjustment device,
Fig. 5
an adjusting device in perspective, simplified representation,
Fig. 6
3 shows a side view with a partial section of a practical embodiment of the adjusting device according to FIG. 5,
Fig. 7a
6 shows a front view of the adjusting device according to FIG. 6 and FIG. 7b a top view of this adjusting device, and
Fig. 8
the attachment of the adjustment or rotary knob.

In Fig.1 ist mit 1 die Rückenlehne und mit 2 der Sitz eines Sessels bezeichnet, wobei die Rückenlehne 1 relativ zum Sitz 2 starr angeordnet sein kann oder über ein bei 3 schematisch angedeutetes Gelenk in der Neigung verstellt werden kann.In FIG. 1, 1 denotes the backrest and 2 the seat of an armchair, wherein the backrest 1 can be arranged rigidly relative to the seat 2 or the inclination can be adjusted via a joint indicated schematically at 3.

In der Anlagefläche 4 der Rückenlehne 1 ist etwa auf der Höhe der Nieren im Mittelbereich eine Druckplatte 5 angeordnet, die aus einem verformbaren Material besteht und durch eine Verstelleinrichtung relativ zur Anlagefläche 4 verformt und verstellt werden kann. Die Druckplatte 5 ist vom Bezugsstoff 6 oder auch einer Polsterung der Rückenlehne 1 abgedeckt, so daß sie von außen nicht sichtbar ist. Am Unterteil ist die Druckplatte 5 um eine in den Fig.1 und 2 bei 7 angedeuteten Achse beispielsweise mittels eines Drehknopfes 8 verschwenkbar, der außerhalb der Rückenlehne zugänglich ist.A pressure plate 5, which consists of a deformable material and can be deformed and adjusted relative to the contact surface 4 by an adjusting device, is arranged in the contact surface 4 of the backrest 1 approximately at the level of the kidneys in the central region. The pressure plate 5 is covered by the upholstery fabric 6 or padding of the backrest 1 so that it is not visible from the outside. On the lower part, the pressure plate 5 can be pivoted about an axis indicated in FIG. 1 and 2 at 7, for example by means of a rotary knob 8, which is accessible outside the backrest.

Fig. 3a zeigt eine Ansicht einer Druckplatte 5, die beispielsweise aus einer verformbaren Kunststoffplatte besteht, die zur leichteren Verformbarkeit über den größten Teil ihrer Höhenabmessung mit Einschnitten 9 versehen ist, so daß sich einzelne federnde Lamellen 10 ergeben, die am Bezugsstoff 6 anliegen, wie Fig.4 zeigt. Die Druckplatte 5 bzw. die Lamellen 10 können in der in Fig.4 dargestellten Form mit einer bestimmten Krümmung vorgeformt sein.3a shows a view of a printing plate 5, which consists, for example, of a deformable plastic plate, which is provided with cuts 9 for easier deformability over most of its height dimension, so that individual resilient lamellae 10 result, which rest against the cover material 6, as shown in FIG. The pressure plate 5 or the lamellae 10 can be preformed in the shape shown in FIG. 4 with a certain curvature.

Fig. 3b zeigt eine Vorderansicht einer Druckplatte 5, die auf dem unteren Randabschnitt um die Achse 7 verdrehbar und auf dem oberen Abschnitt mit zwei senkrecht zur Achse 7 liegenden, parallelen Führungsschlitzen 9ʹ versehen ist, die im Gegensatz zu den Einschnitten 9 am oberen Rand geschlossen sind. In diese Einschnitte 9 bzw. Führungsschlitze 9ʹ greifen Halterungen 29 ein, wie sie in Fig. 6 dargestellt sind.Fig. 3b shows a front view of a pressure plate 5, which is rotatable on the lower edge portion about the axis 7 and is provided on the upper portion with two perpendicular to the axis 7, parallel guide slots 9 ', which in contrast to the incisions 9 closed at the upper edge are. Brackets 29, as shown in FIG. 6, engage in these incisions 9 or guide slots 9..

Die Druckplatte 5 ist so ausgebildet, daß sie im unteren Abschnitt angrenzend an die Schwenkachse 7 steif bzw. weniger leicht vorformbar ist, während sie im übrigen Bereich bis zum oberen Rand flexibel bzw. leichter verformbar ist. Vorzugsweise wird ein Material gewählt, das federnde Eigenschaften hat. Diese über die höhe der Druckplatte unterschiedliche Verformbarkeit kann durch die in Fig. 3a angedeutete Lamellenbildung oder auch dadurch erreicht werden, daß die Druckplatte 5 im unteren Abschnitt eine bestimmte Stärke aufweist und in Richtung auf den oberen Rand zunehmend dünner wird.The pressure plate 5 is designed such that it is stiff or less easily preformable in the lower section adjacent to the pivot axis 7, while it is flexible or easier to deform in the remaining area up to the upper edge. A material is preferably selected which has resilient properties. This different deformability over the height of the pressure plate can be achieved by the lamella formation indicated in FIG. 3a or also in that the pressure plate 5 has a certain thickness in the lower section and becomes increasingly thinner in the direction of the upper edge.

Bei der Ausführungsform nach Fig.4 hat die Druckplatte 5, z.B. eine durchgehend gleichbleibende Stärke, und sie ist im unteren Abschnitt auf einem entsprechend geformten flächigen Abschnitt 11 eines Schwenkteils 12 befestigt, das in der Rückenlehne 1 ortsfest gelagert und um die Achse 7 verschwenkbar ist. Beispielsweise kann das Schwenkteil 12 mit einer in Fig.1 schematisch angedeuteten Welle 13 versehen sein, die in Lagern 14 drehbar gelagert ist, welche im starren Teil der Rückenlehne 1 befestigt sind. Diese Welle 13 kann auf der Außenseite mit einem Drehknopf 8 verbunden sein, der in Achsrichtung relativ zur Welle 13 verschiebbar und federbelastet ist, so daß zwischen Drehknopf 8 und Rückenlehne 1 eine nicht näher dargestellte Rasteinrichtung vorgesehen werden kann, damit die Schwenkstellung der Welle 13 in den jeweiligen Stellungen festgelegt werden kann.In the embodiment according to FIG. 4, the pressure plate 5 has, for example, a constant thickness, and it is fastened in the lower section to a correspondingly shaped flat section 11 of a swivel part 12, which is fixed in the backrest 1 and can be pivoted about the axis 7 . For example, the swivel part 12 can be provided with a shaft 13 schematically indicated in FIG. 1, which is rotatably mounted in bearings 14 which are fastened in the rigid part of the backrest 1. This shaft 13 can be connected on the outside to a rotary knob 8, which is displaceable in the axial direction relative to the shaft 13 and spring-loaded, so that a locking device, not shown, can be provided between the rotary knob 8 and the backrest 1, so that the Pivotal position of the shaft 13 can be set in the respective positions.

Wird in der Ansicht nach Fig.4 das Schwenkteil 12 in Richtung des Pfeiles verschwenkt, so wird der steifere untere Abschnitt der Druckplatte 5 stärker nach außen an den Bezugsstoff 6 angedrückt, während der weichere obere Abschnitt der Druckplatte 5 durch die Spannung des Bezugsstoffes 6 stärker zurückgehalten wird, so daß er der Schwenkbewegung des unteren Abschnitts nicht vollständig folgen kann. Auf diese Weise wird eine verstärkte Wölbung der Druckplatte 5 erreicht, wie dies durch gestrichelte Linien in Fig. 4 dargestellt ist.If the pivoting part 12 is pivoted in the direction of the arrow in the view according to FIG is retained so that it cannot fully follow the pivoting movement of the lower section. In this way, an increased curvature of the pressure plate 5 is achieved, as is shown by broken lines in FIG. 4.

Zwischen dem oberen Rand der Druckplatte 5 und dem Bezugsstoff 6 kann eine in Fig.4 bei 27 angedeutete Abstützung für den freien Rand der Druckplatte 5 vorgesehen werden, wobei diese Abstützung 27 ein Teil des Rahmens der Rückenlehne 1 sein kann. Durch diese Abstützung 27 wird beim Verschwenken des Schwenkteils 12 bzw. des unteren Abschnitts der Druckplatte 5 der obere freie Rand in Schwenkrichtung festgehalten, so daß sich der freie Rand nur längs der Ebene dieser Abstützung 27 etwas verschiebt, während der mittlere Abschnitt der Druckplatte 5 in seiner Wölbung verändert wird. Nach einer Ausführungsabwandlung können die Langlöcher 9ʹ in Fig. 3b mit Vorsprüngen auf der Rückseite der Abstützplatte 27 in Eingriff stehen. Hierdurch wird verhindert, daß sich der freie Rand der Druckplatte 5 so weit nach unten relativ zum unteren Rand der Abstützplatte 27 verschiebt, daß er sich von dieser Abstützung lösen kann. Zugleich wird hierdurch ein Anschlag für die Wölbung der Druckplatte nach außen ausgebildet.Between the upper edge of the pressure plate 5 and the cover material 6, a support indicated in FIG. 4 at 27 can be provided for the free edge of the pressure plate 5, wherein this support 27 can be part of the frame of the backrest 1. By this support 27, the upper free edge is held in the pivoting direction when pivoting the pivoting part 12 or the lower portion of the pressure plate 5, so that the free edge only moves somewhat along the plane of this support 27, while the central portion of the pressure plate 5 in its curvature is changed. After a modification, the elongated holes 9ʹ in Fig. 3b with projections on the back of the support plate 27 are engaged. This prevents the free edge of the pressure plate 5 from moving so far downward relative to the lower edge of the support plate 27 that it can detach itself from this support. At the same time, a stop is formed for the curvature of the pressure plate to the outside.

Nach Fig.5 ist ein aus Blech oder Kunststoff geformtes Schwenkteil 12 vorgesehen, das mit seiner Schwenkachse 7 an einem Träger 21 verschwenkbar gelagert ist, der z.B. im Rahmen der Rückenlehne 1 befestigt ist. Dieses Schwenkteil 12 ist mit zwei seitlichen Stützarmen 26 versehen, an denen die Druckplatte 5 anliegt oder befestigt ist und die dem Abschnitt 11 in Fig.4 entsprechen. Zwischen diesen Stützarmen 26 ist ein Kurvenabschnitt 22 ausgebildet, der an einer Mutter 23 anliegt, die sich über einen Anschlag 24 drehfest am Träger 21 abstützt und längs einer Gewindespindel 25 verstellbar ist, die im Träger 21 verdrehbar gelagert und mit einem Drehknopf 8 verbunden ist. Durch Verdrehen des Drehknopfes 8 wird die Mutter 23 in Achsrichtung der Gewindespindel verschoben, wobei über den Kurvenabschnitt 22 das Schwenkteil 12 verschwenkt wird. Dabei ist es auch möglich, am Kurvenabschnitt ein Eingriffsteil, beispielsweise eine Nut, vorzusehen, die mit einem entsprechenden Eingriffsteil, beispielsweise einem Zapfen, an der Mutter 23 in Eingriff steht, so daß es für die Schwenkbewegung des Schwenkteiles 12 um die Achse 7 keiner Federbeaufschlagung des Schwenkteils 12 bedarf. Üblicherweise reicht aber die Elastizität des Bezugsstoffes für die Rückstellung des Schwenkteiles 12 bzw. der Druckplatte 5 aus.According to FIG. 5, a swivel part 12 made of sheet metal or plastic is provided, which is pivotably mounted with its swivel axis 7 on a support 21 which is fastened, for example, in the frame of the backrest 1. This pivoting part 12 is provided with two lateral support arms 26, on which the pressure plate 5 rests or is fastened and which correspond to section 11 in FIG. Between these support arms 26, a curve section 22 is formed, which bears against a nut 23 is supported in a rotationally fixed manner on the carrier 21 via a stop 24 and is adjustable along a threaded spindle 25 which is rotatably mounted in the carrier 21 and is connected to a rotary knob 8. By turning the rotary knob 8, the nut 23 is displaced in the axial direction of the threaded spindle, the pivot part 12 being pivoted via the curve section 22. It is also possible to provide an engaging part, for example a groove, on the curve section, which engages with a corresponding engaging part, for example a pin, on the nut 23, so that there is no spring action for the pivoting movement of the pivoting part 12 about the axis 7 the pivot part 12 is required. Usually, however, the elasticity of the cover fabric is sufficient to reset the pivoting part 12 or the pressure plate 5.

Fig. 6 zeigt eine Fig. 5 entsprechende Ausführungsform, wobei im Holzrahmen 28 der Rückenlehne 1 eine oder mehrere Halterungen 29 eingeschraubt sind, die jeweils einen Schaft und einen verbreiterten Kopf 30 aufweisen. Mit dem Schaft greift diese Halterung in einen der schlitzartigen Einschnitte 9 oder die Langlöcher 9ʹ der Druckplatte 5 ein, während das verbreiterte Kopfteil 30 die seitlichen Ränder des Einschnitts 9 bzw. der nebeneinanderliegenden Lamellen 10 übergreift. Auf diese Weise wird der obere Rand der Druckplatte 5 am Holzrahmen 28 der Rückenlehne 1 anliegend gehalten, während der untere Abschnitt der Druckplatte weiter nach außen gewölbt werden kann.FIG. 6 shows an embodiment corresponding to FIG. 5, one or more brackets 29 being screwed into the wooden frame 28 of the backrest 1, each having a shaft and a widened head 30. With the shaft, this holder engages in one of the slot-like incisions 9 or the elongated holes 9ʹ of the pressure plate 5, while the widened head part 30 engages over the lateral edges of the incision 9 or the adjacent slats 10. In this way, the upper edge of the pressure plate 5 is held against the wooden frame 28 of the backrest 1, while the lower portion of the pressure plate can be curved further outwards.

Die in Fig. 6 wiedergegebene Druckplatte 5 besteht aus einer Kunststoffplatte mit durchgehend gleicher Dicke, wobei sich die Einschnitte 9 etwa über das obere Drittel der Plattenhöhe erstrecken. Die Druckplatte 5 ist in der in Fig. 6 wiedergegebenen, etwa S-förmigen Seitenansicht vorgeformt, wobei zusätzlich eine Wölbung senkrecht zur Zeichenebene vorgeformt sein kann, wie durch die gestrichelten Linien angedeutet wird. Es ist aber auch möglich, eine im entspannten Zustand ebene Platte 5 vorzusehen.The pressure plate 5 shown in FIG. 6 consists of a plastic plate with the same thickness throughout, the incisions 9 extending approximately over the upper third of the plate height. The pressure plate 5 is preformed in the approximately S-shaped side view shown in FIG. 6, it being additionally possible for a curvature to be preformed perpendicular to the plane of the drawing, as indicated by the dashed lines. But it is also possible to provide a flat plate 5 in the relaxed state.

In Fig. 6 und 7 sind für gleiche bzw. entsprechende Bauteile die gleichen Bezugszeichen wie in Fig. 5 verwendet. Das Schwenkteil 12 umfaßt ein Winkeleisen, auf dessem einen Schenkel der Kurvenabschnitt 22 ausgebildet ist, während am anderen Schenkel die Stützarme 26 befestigt sind. Die Druckplatte 5 ist mit dem unteren Rand am Schwenkteil 12 befestigt, wobei in der in Fig. 6 dargestellten Schwenkstellung der Druckplatte 5 die Stützarme 26 noch nicht an der Druckplatte anliegen, die lediglich durch Verschwenken des Schwenkteils 12 zunächst nach außen gewölbt ist. Bei einer stärkeren Wölbung nach außen kommen die Stützarme 26 an der Druckplatte 5 zum Anliegen.6 and 7, the same reference numerals as in Fig. 5 are used for the same or corresponding components. The pivoting part 12 comprises an angle iron, on the one leg of which the curve section 22 is formed, while the support arms 26 are fastened to the other leg. The pressure plate 5 is fastened with the lower edge to the swivel part 12, wherein in the swivel position of the pressure plate 5 shown in FIG. 6 the support arms 26 are not yet in contact with the pressure plate, which is initially curved outwards only by swiveling the swivel part 12. With a greater curvature outwards, the support arms 26 come to rest on the pressure plate 5.

Der Träger 21 ist mit Fortsätzen 20 in einer Durchbrechung des Holzrahmens 28 befestigt, wie Fig.6 und 7a zeigen. Im Gegensatz zu der schematischen Darstellung nach Fig. 5 sind die Achse 7 und die Gewindespindel 25 übereinanderliegend im Träger 21 angeordnet. An die Gewindespindel 25 schließt sich ein biegsamer Wellenabschnitt 31 an, an dem eine starre Welle 32 befestigt ist, die bei 14 am Rahmen der Rückenlehne drehbar gelagert ist.The carrier 21 is fastened with extensions 20 in an opening in the wooden frame 28, as shown in FIGS. 6 and 7a. In contrast to the schematic representation according to FIG. 5, the axis 7 and the threaded spindle 25 are arranged one above the other in the carrier 21. The threaded spindle 25 is followed by a flexible shaft section 31, to which a rigid shaft 32 is fastened, which is rotatably mounted at 14 on the frame of the backrest.

Fig. 7b zeigt die entspannte Stellung der Druckplatte 5. Durch Verdrehen des Drehknopfes 8 im Uhrzeigersinn wird die Mutter 23 nach links in Fig. 7b bewegt, wodurch das Schwenkteil 12 durch den Kurvenabschnitt 22 nach außen geschwenkt und dadurch die Druckplatte 5 gewölbt wird, wie Fig. 6 zeigt.Fig. 7b shows the relaxed position of the pressure plate 5. By turning the knob 8 clockwise, the nut 23 is moved to the left in Fig. 7b, whereby the pivot member 12 is pivoted outward through the curve portion 22 and thereby the pressure plate 5 is arched, as Fig. 6 shows.

Fig. 8 zeigt eine Ausführungsform der Befestigung des Drehknopfes 8 mit der Welle 32, die am Eingriffsende einen in Achsrichtung verlaufenden Schlitz 33 aufweist. Dieses mit einem Schlitz versehene Ende der Welle 32 ragt in eine Bohrung 34 des Rahmens 28 der Rückenlehne. Nach dem Polstern der Seitenteil der Rückenlehne wird eine Abdeck- und Lagerhülse 35 in die Bohrung 34 eingesetzt und mittels Schrauben an einem Flanschabschnitt am Rahmen 28 befestigt. Die Hülse 35 weist einen Zentrierabschnitt 36 zum Zentrieren der Welle 32 auf. Hierauf wird der Drehknopf 8 aufgesteckt, der mit einer mit einer Innenbohrung versehenen Nabe 37 versehen ist. Quer durch die Bohrung der Nabe 37 führt ein Stift 38, der in der Schlitz 33 der Welle 32 eingreift. Auf dem Außenumfang der Nabe 37 ist ein Federring 39 in einer Ringnut angeordnet, der mit dem Innenumfang der Hülse 35 in Eingriff tritt und den Drehknopf 8 hält. Durch diese Vorrichtung wird die Montage vereinfacht. Fig. 7 zeigt eine einfache Verbindung des Drehknopfes 8 mit der Welle 32 mittels eines Querstiftes.8 shows an embodiment of the fastening of the rotary knob 8 to the shaft 32, which has a slot 33 running in the axial direction at the engagement end. This slotted end of the shaft 32 projects into a bore 34 in the frame 28 of the backrest. After the upholstery of the side part of the backrest, a cover and bearing sleeve 35 is inserted into the bore 34 and fastened to the frame 28 by means of screws on a flange section. The sleeve 35 has a centering section 36 for centering the shaft 32. The rotary knob 8 is then plugged on, which is provided with a hub 37 provided with an inner bore. A pin 38, which engages in the slot 33 of the shaft 32, leads across the bore of the hub 37. On the outer circumference of the hub 37, a spring ring 39 is arranged in an annular groove, which engages with the inner circumference of the sleeve 35 and holds the rotary knob 8. This device simplifies assembly. Fig. 7 shows a simple connection of the rotary knob 8 with the shaft 32 by means of a cross pin.

Bei der Ausführungsform nach Fig. 6 und 7 wird durch die Befestigung des unteren Randes der Druckplatte 5 am Schwenkteil 12 die Rückführbewegung der Druckplatte in die entspannte, ebene Ausgangsstellung erleichtert. Die Druckplatte 5 besteht aus einem elastischen Material. Die Mutter 23 stützt sich in Fig. 6 unmittelbar auf der Innenseite des Trägers 21 zur Verhinderung einer Drehung ab.In the embodiment according to FIGS. 6 and 7, the lower edge of the pressure plate 5 is attached to the swivel part 12 facilitates the return movement of the pressure plate into the relaxed, flat starting position. The pressure plate 5 is made of an elastic material. The nut 23 is supported in FIG. 6 directly on the inside of the carrier 21 to prevent rotation.

Die Verstelleinrichtung zum Verschwenken der Druckplatte kann auch in anderer Weise ausgebildet werden. So kann beispielsweise die in Fig. 1 angedeutete Welle 13, die der Welle 25, 32 in Fig. 7 entspricht, direkt mit der Druckplatte 5 verbunden sein, um diese zu verstellen. Es ist auch möglich, auf dieser Welle 13 eine schraubenlinienförmige Nute mit großer Steigung vorzusehen, in die ein Zapfen oder eine Mutter eingreift. Dieser Zapfen oder die Mutter kann mit einer parallel zur Welle 13 nach außen führenden Stange verbunden werden, die mit einem Verstellhebel in Verbindung steht. Durch Verschwenken des Verstellhebels kann die Welle 13 über die schraubenlinienförmige Nut verschwenkt und damit die Druckplatte 5 verstellt werden.The adjusting device for pivoting the pressure plate can also be designed in a different way. For example, the shaft 13 indicated in FIG. 1, which corresponds to the shaft 25, 32 in FIG. 7, can be connected directly to the pressure plate 5 in order to adjust it. It is also possible to provide a helical groove with a large pitch on this shaft 13, in which a pin or a nut engages. This pin or the nut can be connected to a rod which leads parallel to the shaft 13 and which is connected to an adjusting lever. By pivoting the adjusting lever, the shaft 13 can be pivoted over the helical groove and thus the pressure plate 5 can be adjusted.

Claims (6)

  1. Adjustable backrest of a chair, armchair or the like, comprising a deformable pressure plate (5) arranged in the supporting surface (4) of the backrest (1), which plate is deformable or adjustable respectively relative to the other supporting surface (4) by an adjustment means (8, 12) operable from outside, wherein the pressure plate (5) covered by the cover textile (6) of the backrest (1) is fastened at a swingable member (12) which is swingably disposed in the backrest (1), and wherein the adjustment means has a spindle (25) rotatably disposed in a holder (21) and provided with a threaded portion, which spindle (25) is rotatable from outside by a rotary button (8) and engages with a nut (23) which is strutted not rotatably at the holder (21),
    characterized in that
    the nut (23) abuts against a curve portion (22) of the swingable element (12) which is swingably disposed in the holder (21).
  2. Backrest according to claim 1,
    characterized in that
    the pressure plate (5) is rigid in the lower portion in the range of its axis of rotation (7) and easily and preferably elastically deformable in the other range.
  3. Backrest according to claims 1 and 2,
    characterized in that
    the pressure plate (5) is provided in the upper portion with recesses (9) for the embodiment of lamellas (10).
  4. Backrest according to claims 1 to 3,
    characterized in that
    the upper edge of the pressure plate (5) is supported by a support means (27, 29).
  5. Backrest according to claims 1 to 4,
    characterized in that
    the swingable part (12) is provided with two lateral support arms (26), against which the pressure plate (5) abuts or where it is fastened respectively, wherein between the support arms (26) the curve portion (22) is embodied.
  6. Backrest according to the preceding claims,
    characterized in that
    the rotary button (8) is provided with a hub (37) showing an axial bore crossed by a pin (38), wherein the hub (37) is rotatably insertable in a sleeve (35) insertable in the frame (28) of the backrest and the free end of a shaft (32) is provided with a slot (33) for receiving the pin (38).
EP88101995A 1987-02-12 1988-02-11 Adjustable backrest Expired - Lifetime EP0279354B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88101995T ATE74726T1 (en) 1987-02-12 1988-02-11 ADJUSTABLE BACK.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8702174U 1987-02-12
DE8702174U DE8702174U1 (en) 1987-02-12 1987-02-12 adjustable back

Publications (2)

Publication Number Publication Date
EP0279354A1 EP0279354A1 (en) 1988-08-24
EP0279354B1 true EP0279354B1 (en) 1992-04-15

Family

ID=6804654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101995A Expired - Lifetime EP0279354B1 (en) 1987-02-12 1988-02-11 Adjustable backrest

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US (1) US4810033A (en)
EP (1) EP0279354B1 (en)
AT (1) ATE74726T1 (en)
DE (2) DE8702174U1 (en)

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Also Published As

Publication number Publication date
ATE74726T1 (en) 1992-05-15
DE8702174U1 (en) 1987-04-30
DE3869992D1 (en) 1992-05-21
US4810033A (en) 1989-03-07
EP0279354A1 (en) 1988-08-24

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