EP0591933B1 - Chair with backrest - Google Patents

Chair with backrest Download PDF

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Publication number
EP0591933B1
EP0591933B1 EP93116100A EP93116100A EP0591933B1 EP 0591933 B1 EP0591933 B1 EP 0591933B1 EP 93116100 A EP93116100 A EP 93116100A EP 93116100 A EP93116100 A EP 93116100A EP 0591933 B1 EP0591933 B1 EP 0591933B1
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EP
European Patent Office
Prior art keywords
support
backrest
chair
plate
back plate
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
EP93116100A
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German (de)
French (fr)
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EP0591933A1 (en
Inventor
Manfred Rainer Kleinikel
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.)
Comforto GmbH
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Comforto GmbH
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Filing date
Publication date
Application filed by Comforto GmbH filed Critical Comforto GmbH
Publication of EP0591933A1 publication Critical patent/EP0591933A1/en
Application granted granted Critical
Publication of EP0591933B1 publication Critical patent/EP0591933B1/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—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs

Definitions

  • the invention relates to a chair, in particular an office or work chair, with a backrest according to the features specified in the preamble of claim 1.
  • a chair of this type is disclosed in CH-A-558158.
  • the back plate of chairs of the specified type is freely pivoted on the backrest support about a horizontal pendulum axis. When the user is standing upright, it supports his or her back below the pendulum axis in the lower thoracic vertebrae area and also in the upper lumbar area.
  • the back plate is tilted backwards by the pressure now exerted by the user in the upper thoracic vertebrae area and in the shoulder area, while at the same time the part below the pendulum axis is pressed forward and thus supports the hollow bending of the back and the lordosis - Increased support.
  • this only works if the lever arm of the force acting above the pendulum axis is greater than the lever arm of the support area pressed against the back below the pendulum axis, since otherwise the back plate cannot tilt backwards.
  • the back plate can only extend downwards to a limited extent and there is no effective back support in the lower lumbar region and in the pelvic region.
  • the object of the invention is to provide a chair of the type specified so that an additional support in the lower lumbar and pelvic area is created while maintaining the pendulum support of the back plate and the associated ergonomic advantages, which the user stiff in any sitting position Backrests provide the familiar feeling of security.
  • FIG. 1 shows a schematically simplified side view of a first embodiment of the invention.
  • Fig. 2 shows a second embodiment in a similar representation.
  • a seat support 3 - preferably rotatable and height-adjustable - is mounted on a base frame 1, on which a seat plate 5 is arranged rigidly or movably.
  • a backrest support 7 has an arm 7a which engages under the seat support 3 and is mounted in a horizontal-axis swivel joint 9 on the seat support 3.
  • the means for rotating and adjusting the height of the seat support 3, for moving the seat plate 5 and for controlling and / or locking the inclination of the backrest support 7 are omitted in the drawing for the sake of simplicity.
  • At the upper end of the backrest support 7 is in a horizontal-axis pendulum joint a rigid back plate 13 is pivoted freely.
  • a rigid lower pelvic support plate 17 This is connected in one piece to a rigid lower pelvic support plate 17 via a flexible connecting section 15, which represents a horizontal-axis connecting joint.
  • the back plate 13 and pelvic support plate 17 can also be formed as separate parts and connected by a connecting joint.
  • the pelvic support plate 17 is mounted such that it can be displaced in height on the back support 7, for example by means of a guide pin 19 which engages in a guide slot 21 on the back support 7.
  • Back plate 13 and pelvic support plate 17 are covered with a common cushion, and this contour defines a normal back support point 23 below the pendulum axis 11, for example in the lower thoracic vertebra area of an upright user.
  • the support in the lower lumbar and in the pelvic region is brought about by the pelvic support plate 17, for example at a support point 25, the support force being partly introduced via the connecting link 15 into the back plate 11, but mainly via the guide 19, 21 directly into the backrest support 7.
  • the back support point 23 is moved forward and thus supports the hollow bending of the user's back.
  • This movement is also followed by the upper area of the pelvic support plate 17, so that the support of the lower lumbar and pelvic area is not lost at about point 25.
  • the pelvic support plate 17 its lower end slides upward in the guide 21 on the backrest support 7, so that the back plate 13 and pelvic support plate 17 assume, for example, the position shown in dashed lines in FIG. 1.
  • FIG. 2 differs from that of FIG. 1 only in that the lower end of the back plate 17 in the guide 19, 21 is not freely displaceable, but that this displacement is positively controlled depending on the inclination of the back support 7 .
  • this forced control is effected by a traction cable guide, a traction cable 29 being fastened to the guide pin 19 of the pelvic support plate 17.
  • One end of the pull cable 29 is fastened below the swivel joint 9 in a first anchoring point 31, while the other end of the pull cable 29 is guided around a deflection roller 33 on the backrest support 7 and is then fastened in the region of the swivel joint 9 in a second anchoring point 35.
  • the arrangement of the anchoring points 31, 35 shown above and below the swivel joint 9 ensures that when the backrest support 7 is inclined backwards, the guide pin 19 in the guide slot 21 is pulled upward, as a result of which the pelvic support plate 17 is forcibly moved forward in its upper part, so that there is a bulging of the backrest in the lumbar region.

Landscapes

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

Abstract

The backrest of an office or work chair has a back plate (13), which is mounted on a backrest support (7) so as to be pivotable about a floating shaft (11), and below the back plate a pelvic support plate (17), the upper end of which is articulatedly connected to the back plate (13) and the lower end of which is mounted on the backrest support (7) so as to be displaceable in a guide (19, 21), either freely displaceable or displaced with positive control in dependence on the tilt of the backrest support (7). <IMAGE>

Description

Die Erfindung betrifft einen Stuhl, insbesondere einen Büro- oder Arbeitsstuhl, mit einer Rückenlehne gemäß den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen.The invention relates to a chair, in particular an office or work chair, with a backrest according to the features specified in the preamble of claim 1.

Ein Stuhl dieser Gattung ist in der CH-A-558158 offenbart.A chair of this type is disclosed in CH-A-558158.

Ein Nachteil konventionell ausgeführter Bürostühle, bei denen die Rückenlehne relativ zur Sitzfläche neigbar ist, besteht darin, daß sie zwar eine zurückgelehnte Haltung des Oberkörpers zulassen, dabei jedoch die erwünschte natürliche Hohlbiegung der Wirbelsäule (Lordose) nicht unterstützen. Um dem abzuhelfen, ist bei Stühlen der angegebenen Art die Rückenplatte um eine horizontale Pendelachse frei schwenkbar am Rückenlehnenträger gelagert. Bei aufrechter Haltung des Benutzers stützt sie dessen Rücken unterhalb der Pendelachse im unteren Brustwirbelbereich und auch noch im oberen Lendenbereich ab. Lehnt sich der Benutzer nach hinten, so wird die Rückenplatte durch den vom Benutzer nunmehr im oberen Brustwirbelbereich und im Schulterbereich ausgeübten Anpreßdruck nach hinten geneigt, wobei gleichzeitig ihr unterhalb der Pendelachse gelegener Teil nach vorne gedrückt wird und somit die Hohlbiegung des Rückens unterstützt und die Lordose-Abstützung verstärkt. Dies funktioniert jedoch nur dann, wenn der Hebelarm der oberhalb der Pendelachse angreifenden Kraft größer ist als der Hebelarm des unterhalb der Pendelachse gegen den Rücken gepreßten Abstützbereiches, da andernfalls eine Rückwärtsneigung der Rückenplatte nicht stattfinden kann. Dies bedeutet, daß sich die Rückenplatte nur begrenzt nach unten erstrecken kann und eine wirksame Rückenabstützung im unteren Lendenbereich und im Beckenbereich fehlt.A disadvantage of conventionally designed office chairs, in which the backrest can be tilted relative to the seat surface, is that although they allow the upper body to lean back, they do not support the desired natural hollow bending of the spine (lordosis). To remedy this, the back plate of chairs of the specified type is freely pivoted on the backrest support about a horizontal pendulum axis. When the user is standing upright, it supports his or her back below the pendulum axis in the lower thoracic vertebrae area and also in the upper lumbar area. If the user leans backwards, the back plate is tilted backwards by the pressure now exerted by the user in the upper thoracic vertebrae area and in the shoulder area, while at the same time the part below the pendulum axis is pressed forward and thus supports the hollow bending of the back and the lordosis - Increased support. However, this only works if the lever arm of the force acting above the pendulum axis is greater than the lever arm of the support area pressed against the back below the pendulum axis, since otherwise the back plate cannot tilt backwards. This means, that the back plate can only extend downwards to a limited extent and there is no effective back support in the lower lumbar region and in the pelvic region.

Aufgabe der Erfindung ist es, einen Stuhl der angegebenen Art so auszubilden, daß unter Beibehaltung der pendelfähigen Abstützung der Rückenplatte und der damit verbundenen ergometrischen Vorteile eine zusätzliche Abstützung im unteren Lenden- und im Beckenbereich geschaffen wird, die dem Benutzer in jeder Sitzposition das von starren Rückenlehnen gewohnte sichere Gefühl vermittelt.The object of the invention is to provide a chair of the type specified so that an additional support in the lower lumbar and pelvic area is created while maintaining the pendulum support of the back plate and the associated ergonomic advantages, which the user stiff in any sitting position Backrests provide the familiar feeling of security.

Die erfindungsgemäße Lösung dieser Aufgabe ist im Anspruch 1 angegeben. Die Unteransprüche beziehen sich auf vorteilhafte weitere Ausgestaltungen der Erfindung.The solution to this problem according to the invention is specified in claim 1. The subclaims relate to advantageous further refinements of the invention.

Zwei Ausführungsformen der Erfindung werden im Folgenden an der Zeichnung näher erläutert.Two embodiments of the invention are explained in more detail below on the drawing.

Fig. 1 zeigt in schematisch vereinfachter Seitenansicht eine erste Ausführungsform der Erfindung.1 shows a schematically simplified side view of a first embodiment of the invention.

Fig. 2 zeigt in ähnlicher Darstellung eine zweite Ausführungsform.Fig. 2 shows a second embodiment in a similar representation.

Gemäß Fig. 1 ist an einem Fußgestell 1 ein Sitzträger 3 - vorzugsweise drehbar und höhenverstellbar - gelagert, auf dem starr oder beweglich eine Sitzplatte 5 angeordnet ist. Ein Rückenlehnenträger 7 hat einen unter den Sitzträger 3 greifenden Arm 7a und ist in einem horizontalachsigen Schwenkgelenk 9 am Sitzträger 3 gelagert. Die Mittel zum Drehen und Höhenverstellen des Sitzträgers 3, zum Bewegen der Sitzplatte 5 und zum Steuern und/oder Arretieren der Neigung des Rückenlehnenträgers 7 sind in der Zeichnung der Einfachheit halber weggelassen. Am oberen Ende des Rückenlehnenträgers 7 ist in einem horizontalachsigen Pendelgelenk eine starre Rückenplatte 13 frei schwenkbar gelagert. Diese ist über einen flexiblen Verbindungsabschnitt 15, der ein horizontalachsiges Verbindungsgelenk darstellt, mit einer starren unteren Beckenstützplatte 17 einstückig verbunden. Selbstverständlich können Rückenplatte 13 und Beckenstützplatte 17 auch als getrennte Teile ausgebildet und durch ein Verbindungsgelenk verbunden sein. An ihrem unteren Ende ist die Beckenabstützplatte 17 am Rückenträger 7 höhenverschiebbar gelagert, beispielsweise durch einen Führungszapfen 19, der in einen Führungsschlitz 21 am Rückenträger 7 eingreift.1, a seat support 3 - preferably rotatable and height-adjustable - is mounted on a base frame 1, on which a seat plate 5 is arranged rigidly or movably. A backrest support 7 has an arm 7a which engages under the seat support 3 and is mounted in a horizontal-axis swivel joint 9 on the seat support 3. The means for rotating and adjusting the height of the seat support 3, for moving the seat plate 5 and for controlling and / or locking the inclination of the backrest support 7 are omitted in the drawing for the sake of simplicity. At the upper end of the backrest support 7 is in a horizontal-axis pendulum joint a rigid back plate 13 is pivoted freely. This is connected in one piece to a rigid lower pelvic support plate 17 via a flexible connecting section 15, which represents a horizontal-axis connecting joint. Of course, the back plate 13 and pelvic support plate 17 can also be formed as separate parts and connected by a connecting joint. At its lower end, the pelvic support plate 17 is mounted such that it can be displaced in height on the back support 7, for example by means of a guide pin 19 which engages in a guide slot 21 on the back support 7.

Rückenplatte 13 und Beckenstützplatte 17 sind mit einem gemeinsamen Polster abgedeckt, und dieses bestimmt durch seine Kontur einen normalen Rückenabstützpunkt 23 unterhalb der Pendelachse 11 etwa im unteren Brustwirbelbereich eines aufrecht sitzenden Benutzers. Die Abstützung im unteren Lenden- und im Beckenbereich wird durch die Beckenstützplatte 17 etwa an einem Abstützpunkt 25 bewirkt, wobei die Abstützkraft teilweise über das Verbindungsgelenkt 15 in die Rückenplatte 11 überwiegend aber über die Führung 19, 21 direkt in den Rückenlehnenträger 7 eingeleitet wird.Back plate 13 and pelvic support plate 17 are covered with a common cushion, and this contour defines a normal back support point 23 below the pendulum axis 11, for example in the lower thoracic vertebra area of an upright user. The support in the lower lumbar and in the pelvic region is brought about by the pelvic support plate 17, for example at a support point 25, the support force being partly introduced via the connecting link 15 into the back plate 11, but mainly via the guide 19, 21 directly into the backrest support 7.

Lehnt sich der Benutzer zurück und übt dabei mit seinem oberen Rücken- und Schulterbereich eine Kraft auf die Rükkenplatte 13 oberhalb der Pendelachse 11 aus, so schwenkt diese aufgrund des größeren Hebelarms relativ zur Pendelachse 11 nach hinten, wobei gleichzeitig der unterhalb der Pendelachse liegende Teil mit dem Rückenabstützpunkt 23 nach vorne bewegt wird und somit die Hohlbiegung des Rükkens des Benutzers unterstützt. Diese Bewegung wird auch vom oberen Bereich der Beckenstützplatte 17 mitgemacht, so daß auch die Abstützung des unteren Lenden- und Beckenbereichs etwa am Punkt 25 nicht verlorengeht. Bei dieser Vorwärtsbewegung der Beckenstützplatte 17 gleitet ihr unteres Ende in der Führung 21 am Rückenlehnenträger 7 nach oben, so daß Rückenplatte 13 und Beckenstützplatte 17 beispielsweise die in Fig. 1 gestrichelt dargestellte Position einnehmen.If the user leans back and exerts a force on the back plate 13 above the pendulum axis 11 with his upper back and shoulder area, it swings backwards due to the larger lever arm relative to the pendulum axis 11, with the part lying below the pendulum axis also being included the back support point 23 is moved forward and thus supports the hollow bending of the user's back. This movement is also followed by the upper area of the pelvic support plate 17, so that the support of the lower lumbar and pelvic area is not lost at about point 25. During this forward movement of the pelvic support plate 17, its lower end slides upward in the guide 21 on the backrest support 7, so that the back plate 13 and pelvic support plate 17 assume, for example, the position shown in dashed lines in FIG. 1.

Diese Funktionen erfolgen unabhängig davon, ob zusätzlich eine Neigung des Rückenlehnenträgers 7 im Schwenkgelenk 9 erfolgt. Durch eine bei 27 angedeutete Zug- oder Druckfeder kann eine Vorspannung zur Anpassung an ein individuelles Benutzerempfinden eingestellt werden.These functions take place regardless of whether the backrest support 7 is additionally inclined in the swivel joint 9. By means of a tension or compression spring indicated at 27, a pretension can be set to adapt to an individual user experience.

Die in Fig. 2 dargestellte Ausführungsform unterscheidet sich von der nach Fig. 1 nur dadurch, daß das untere Ende der Rückenplatte 17 in der Führung 19, 21 nicht frei verschieblich ist, sondern daß diese Verschiebung in Abhängigkeit von der Neigung des Rückenträgers 7 zwangsgesteuert wird. Diese Zwangssteuerung wird bei der dargestellten Ausführungsform durch eine Zugseilführung bewirkt, wobei ein Zugseil 29 am Führungsstift 19 der Beckenstützplatte 17 befestigt ist. Das eine Ende des Zugseils 29 ist unterhalb des Drehgelenks 9 in einem ersten Verankerungspunkt 31 befestigt, während das andere Ende des Zugseils 29 am Rückenlehnenträger 7 um eine Umlenkrolle 33 geführt und dann im Bereich des Drehgelenks 9 in einem zweiten Verankerungspunkt 35 befestigt ist.The embodiment shown in FIG. 2 differs from that of FIG. 1 only in that the lower end of the back plate 17 in the guide 19, 21 is not freely displaceable, but that this displacement is positively controlled depending on the inclination of the back support 7 . In the embodiment shown, this forced control is effected by a traction cable guide, a traction cable 29 being fastened to the guide pin 19 of the pelvic support plate 17. One end of the pull cable 29 is fastened below the swivel joint 9 in a first anchoring point 31, while the other end of the pull cable 29 is guided around a deflection roller 33 on the backrest support 7 and is then fastened in the region of the swivel joint 9 in a second anchoring point 35.

Durch die dargestellte Anordnung der Verankerungspunkte 31, 35 oberhalb und unterhalb des Drehgelenks 9 wird erreicht, daß bei Rückwärtsneigung des Rückenlehnenträgers 7 der Führungsstift 19 im Führungsschlitz 21 nach oben gezogen wird, wodurch die Beckenstützplatte 17 in ihrem oberen Teil zwangsweise nach vorne bewegt wird, so daß sich eine Vorwölbung der Rückenlehne im Lendenbereich ergibt.The arrangement of the anchoring points 31, 35 shown above and below the swivel joint 9 ensures that when the backrest support 7 is inclined backwards, the guide pin 19 in the guide slot 21 is pulled upward, as a result of which the pelvic support plate 17 is forcibly moved forward in its upper part, so that there is a bulging of the backrest in the lumbar region.

Claims (6)

  1. A chair, in particular an office chair or work chair, with a backrest which has a backrest support (7) and, mounted freely pivotably thereon about a horizontal swing axis (11), a substantially rigid back plate (13) which in its part situated below the swing axis (11) supports the back of a user sitting upright at a normal back support point (23) in the lower pectoral vertebral region and extends upwardly beyond the swing axis (11) into the shoulder region of the user, characterised in that below the back plate (13) a substantially rigid pelvic support plate (17) is provided, the upper end of which is connected flexibly with the lower end of the back plate (13) at a connecting joint (15) and the lower end of which is displaceably mounted on the backrest support (7) in a guide (19, 21).
  2. A chair according to Claim 1, characterised in that the lower end of the pelvic support plate (17) is freely displaceable in the guide (19, 21).
  3. A chair according to Claim 1, characterised in that the backrest support (7) is pivotably mounted on the chair frame (1, 2) about a horizontal pivot axis (9), and in that a kinematic automatic control (29, 31, 33, 35) is provided which controls the displacement of the lower end of the pelvic support plate (17) on the backrest support (7) as a function of the inclination of the backrest support (7).
  4. A chair according to Claim 3, characterised in that the kinematic automatic control comprises a traction cable (29) engaging at the lower end of the pelvic support plate (17).
  5. A chair according to any one of Claims 1 to 4, characterised in that the connecting joint (15) between the back plate (13) and the pelvic support plate (17) is formed by a flexible connecting member.
  6. A chair according to Claim 5, characterised in that the back plate (13) and the pelvic support plate (17) are joined together in one piece via the flexible connecting member (15).
EP93116100A 1992-10-06 1993-10-05 Chair with backrest Expired - Lifetime EP0591933B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4233627A DE4233627A1 (en) 1992-10-06 1992-10-06 Chair with backrest
DE4233627 1992-10-06

Publications (2)

Publication Number Publication Date
EP0591933A1 EP0591933A1 (en) 1994-04-13
EP0591933B1 true EP0591933B1 (en) 1995-12-20

Family

ID=6469785

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116100A Expired - Lifetime EP0591933B1 (en) 1992-10-06 1993-10-05 Chair with backrest

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EP (1) EP0591933B1 (en)
AT (1) ATE131702T1 (en)
DE (2) DE4233627A1 (en)
ES (1) ES2052469T1 (en)
GR (1) GR940300041T1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6637072B2 (en) 2000-09-29 2003-10-28 Formway Furniture Limited Castored base for an office chair
US20150102647A1 (en) * 2013-10-10 2015-04-16 James E. Grove Dynamic lumbar support for a chair

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU783829B2 (en) 2000-09-28 2005-12-08 Formway Furniture Limited A reclinable chair
US6565153B2 (en) * 2001-07-31 2003-05-20 Johnson Controls Technology Corporation Upper back support for a seat
CN100420404C (en) * 2002-10-11 2008-09-24 国誉株式会社 Structure of chair backrest
DE102008036130B4 (en) * 2008-08-01 2014-12-18 Sedus Stoll Ag Tilting backrest
WO2013164078A1 (en) * 2012-05-04 2013-11-07 Sander, Armin Chair, in particular office chair

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH558158A (en) * 1973-05-18 1975-01-31 Bolleter Emil Office chair with angular adjustment of back support - adjusts seat simultaneously with angle of back support
DE3700862A1 (en) * 1987-01-14 1988-07-28 Vogt Bueromoebel Seating furniture

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6637072B2 (en) 2000-09-29 2003-10-28 Formway Furniture Limited Castored base for an office chair
US20150102647A1 (en) * 2013-10-10 2015-04-16 James E. Grove Dynamic lumbar support for a chair
US9357849B2 (en) * 2013-10-10 2016-06-07 James E. Grove Dynamic lumbar support for a chair

Also Published As

Publication number Publication date
ES2052469T1 (en) 1994-07-16
DE4233627A1 (en) 1994-04-07
ATE131702T1 (en) 1996-01-15
DE59301203D1 (en) 1996-02-01
EP0591933A1 (en) 1994-04-13
GR940300041T1 (en) 1994-07-29

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