EP0179224B1 - Arrangement of a pneumatic spring, particularly for the backrest support of an office chair - Google Patents

Arrangement of a pneumatic spring, particularly for the backrest support of an office chair Download PDF

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Publication number
EP0179224B1
EP0179224B1 EP85110541A EP85110541A EP0179224B1 EP 0179224 B1 EP0179224 B1 EP 0179224B1 EP 85110541 A EP85110541 A EP 85110541A EP 85110541 A EP85110541 A EP 85110541A EP 0179224 B1 EP0179224 B1 EP 0179224B1
Authority
EP
European Patent Office
Prior art keywords
gas spring
disposed
arrangement
sheath
sheath part
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
EP85110541A
Other languages
German (de)
French (fr)
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EP0179224A2 (en
EP0179224A3 (en
Inventor
Elke Dauphin Geb. Caplick
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.)
Buerositzmobelfabrik Friedrich-W Dauphin & Co GmbH
Original Assignee
Buerositzmobelfabrik Friedrich-W Dauphin & Co GmbH
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.)
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Publication date
Application filed by Buerositzmobelfabrik Friedrich-W Dauphin & Co GmbH filed Critical Buerositzmobelfabrik Friedrich-W Dauphin & Co GmbH
Priority to AT85110541T priority Critical patent/ATE42451T1/en
Publication of EP0179224A2 publication Critical patent/EP0179224A2/en
Publication of EP0179224A3 publication Critical patent/EP0179224A3/en
Application granted granted Critical
Publication of EP0179224B1 publication Critical patent/EP0179224B1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • A47C1/03238—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by means of peg-and-notch or pawl-and-ratchet mechanism
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03283—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with fluid springs

Definitions

  • the invention is directed to a gas spring arrangement according to the preamble of claim 1.
  • Gas spring arrangements of this type are used in particular to dampen the pivoting movement of the backrest support part or the backrest and, if necessary, coordinate the seat with office chairs.
  • the locking device should enable an absolutely secure fixation, for example, in spite of the relatively high torques that occur.
  • care must be taken to ensure that the pivoting movement in the triggered state is not hindered by the locking device and is only damped by the gas spring which takes effect.
  • the object of the invention is to design a gas spring arrangement of the type mentioned at the outset in such a way that reliable detachment is made possible with easy detachability, the aim being a construction which is as simple as possible and thus equally reliable and inexpensive to implement.
  • a particularly good surface pressure is achieved in an embodiment according to claim 2.
  • the constructive measures provided in accordance with claim 3 ensure that the piston part and sleeve part can be braced relative to one another without any problems, and that the free pivoting movement is not impeded by clamping in the released state of the locking device.
  • the embodiment according to claim 4 ensures that a stop, in particular when handling the actuating handle, fixes the sleeve and piston part despite the provided axial play.
  • the measure according to claim 5 ensures in a simple manner that while maintaining the desired axial play an uncontrolled axial movement, which would also lead to an undefined position of the actuating handle, is avoided.
  • the embodiment according to claim 6 makes it possible to use a spring which is of particularly simple design and is therefore inexpensive to manufacture.
  • the measure according to claim 7 enables the spring to be assembled very easily.
  • FIG. 1 An office chair shown in FIG. 1 comprises a base frame 1 with a support column 2 which is connected to a seat support 4 receiving the upholstered seat 3. In Fig. Only the lining 5 of the seat support 4 is shown.
  • the seat 3 is articulated on the one hand to the seat support 4 at its front end and on the other hand to the backrest support part 7.
  • the articulated Connection between the seat support 4 and the backrest support part 7 is established by a pivot pin 10 which passes through the side walls 11, 12 and 13, 14 of the backrest support part 7 and the seat support 4, respectively.
  • the backrest support part 7 and the seat support 4 are each U-shaped in cross-section, the U-bottoms 15, 16 pointing towards the top, that is to say towards the seat.
  • a releasable fastening device 17 for the backrest support column is arranged at the rear end of the backrest support part 7.
  • a gas spring 19 is provided to dampen the pivoting movement of the backrest support part 7 about the axis 6.
  • the end 20 of the gas spring 19 on the housing side is pivotally attached to a bolt 23 by means of an annular sleeve 22 fastened to the housing 21 of the gas spring 19, which bolt passes through the side walls 11, 12 of the backrest support part 7 and is fixed by means of the heads 24.
  • the piston 25 is connected to an annular sleeve 26 which performs a distance function and which is pivotably arranged on a bolt 27 which acts as a cross strut and passes through the side walls 13, 14 of the seat support 4 and is fixed there.
  • the bolt 23 is arranged in the region of the upper edge 28 of the backrest support part 7, while the bolt 27 is arranged in the region of the lower edge of the seat support 4 below the pivot bolt 10, the bolts 23, 27 being relative to one another such that the gas spring 19 is approximately an angle from 30 to 45 ° with the plane of the seat 3. This makes it possible to cushion the movement of the backrest 8 relative to the seat support 4 without the need to use additional counter-springs which bring about the back movement of the backrest.
  • the locking device 29 is arranged approximately parallel to the gas spring 19.
  • This comprises a piston part 30 and a sleeve part 31 shown partially broken open in FIG. 3.
  • the piston part 30 and the sleeve part 31 are rectangular in cross-section, the piston part 30 engaging in the sleeve part 31 so as to be longitudinally displaceable.
  • the piston part 30 has a bore 32 which is penetrated by the bolt 27.
  • a spacer sleeve 33 holds the piston part 30 at a preselected minimum distance from the annular sleeve 26 and thus from the gas spring 19.
  • the sleeve part 31 also has a bore 33 'through which the bolt 23 passes.
  • a U-shaped spring clip 35 with one leg 36 bears against the inside 34 of the sleeve part 31, the other leg 37 being supported on the inside of the side wall 13.
  • the outside 38 of the sleeve part 31 has a bore 39.
  • a threaded attachment 40 is welded, which is surrounded by a plastic spacer 41.
  • a threaded bolt 42 is screwed into the threaded attachment 40, and an actuating handle 43 is attached to the rear end thereof.
  • the threaded bolt 42 passes through a bore 44 in the side wall 12 and an approximately circular segment-shaped recess 45 in the side wall 14 which allows an unimpeded pivoting movement.
  • the gas spring arrangement according to the invention works so that when the threaded bolt 42 is loosened, a free pivoting movement between the backrest support part 7 and the seat support 4 is possible, which is damped by the gas spring 19 so that no additional counter-spring is required to retrieve the backrest 8.
  • the threaded bolt 42 is screwed into the threaded attachment 40, the front end 46 of the threaded bolt 42 presses against the piston part 30 and this against the inner wall of the sleeve part 31 and presses the piston part 30 there in such a way that despite one only low torque required to actuate the handle 43 an absolutely reliable locking of the backrest adjustment is achieved.

Abstract

In a gas spring arrangement, comprising a gas spring disposed between two elements which are pivotable in relation to one another around a pivot axis, which damps the pivot movement, and a mechanical arrangement with an activating lever for the releasable adjustment of the pivot movement, especially for the adjustment of the inclination of the backrest of office chairs, it is provided, on the one hand, to make possible a simple damping of the pivotal movement of the backrest support part relative to the seat carrier and, on the other hand, to make possible the easily operable yet still secure locking of this pivotal movement, that the gas spring (19) is fastened between two transverse struts (bolts 23, 27), each disposed on an element (seat carrier 4, backrest support 7) parallel to the pivot axis (6), that the mechanical adjustment means (29) has a sheath part (31) and a pistion part (30) longitudinally movable in the sheath part (31), that both the sheath part (31) and the piston part (30) are each connected with one of the transverse struts (bolts 23, 27) and are disposed approximately parallel to the gas spring (19), and that the sheath part (31) has a lateral threaded bore (bore 39, threaded top 40), into which a threaded bolt (42) disposed at the front end of the activating lever (43) can be screwed in such a way, that the piston part (30) can be braced against the sheath part (31).

Description

Die Erfindung richtet sich auf eine Gasfederanordnung nach dem Oberbegriff von Anspruch 1.The invention is directed to a gas spring arrangement according to the preamble of claim 1.

Derartige Gasfederanordnungen werden insbesondere dazu benutzt, die Schwenkbewegung des Rückenlehnentrageteils bzw. der Rückenlehne und gegebenenfalls koordiniert hiermit des Sitzes bei Bürostühlen zu dämpfen. Um dem Benutzer solcher Bürostühle die Möglichkeit zu geben, die Rückenlehnen- bzw. Sitzneigung entweder in einer gewünschten Position fest einzustellen oder aber die Hückenlehne bzw. den Sitz schwenkbar zu halten, damit sie den Körperbewegungen folgen können, ist es bekannt, die Schwenkbewegung unterbindende, lösbare Arretiereinrichtungen vorzusehen. Derartige Arretiereinrichtungen können entweder bei Verwendung längenverstellbarer Gasfedern unmittelbar auf die Gasfeder einwirken.Gas spring arrangements of this type are used in particular to dampen the pivoting movement of the backrest support part or the backrest and, if necessary, coordinate the seat with office chairs. In order to give the user of such office chairs the possibility of either permanently setting the backrest or seat inclination in a desired position or of keeping the backrest or the seat pivotable so that they can follow the body movements, it is known to prevent the pivoting movement, provide detachable locking devices. Locking devices of this type can act directly on the gas spring either when using length-adjustable gas springs.

Andererseits besteht die Möglichkeit, zusätzlich zur Gasfeder eine eigene mechanische Arretiereinrichtung vorzusehen. Eine derartige Gasfederanordnung, wie sie im Oberbegriff des Patentanspruches 1 vorausgesetzt wurde, ist aus der DE-A-26 30 820 bekannt. Hierbei sind zwischen den beiden relativ zueinander um eine Schwenkachse schwenkbaren Bauteilen, nämlich einem Sitzträger und einem Rückenlehnentrageteil, Gelenklaschen angeordnet, die mittels Klemmscheiben in ihrer Winkellage zum Sitzträger festgeklemmt werden können. Die Klemmscheiben-werden mit einer ortsfest gelagerten Gewindespindel angezogen bzw. gelöst. Der konstruktive Aufwand für diese Anordnung ist sehr groß. Außerdem ist keine sichere Klemmung gewährleistet. Andererseits weist diese Anordnung den Vorteil auf, daß kostengünstige einfache Gasfedern verwendet werden können.On the other hand, it is possible to provide a separate mechanical locking device in addition to the gas spring. Such a gas spring arrangement, as was assumed in the preamble of claim 1, is known from DE-A-26 30 820. Here, articulated brackets are arranged between the two components which can be pivoted relative to one another about a pivot axis, namely a seat support and a backrest support part, and can be clamped in their angular position relative to the seat support by means of clamping disks. The clamping disks are tightened or loosened with a stationary threaded spindle. The design effort for this arrangement is very large. In addition, no secure clamping is guaranteed. On the other hand, this arrangement has the advantage that inexpensive simple gas springs can be used.

Die vorstehend geschilderten Gasfederanordnungen sollen zwei an sich konkurrierende Anforderungen erfüllen. Zum einen soll es die Arretiereinrichtung ermöglichen, trotz der relativ hohen auftretenden Drehmomente eine absolut sichere Fixierung, z. B. des Sitzes oder der Rückenlehne, in einer bestimmten Neigungslage zu ermöglichen ; zum anderen soll das Betätigen der Arretiereinrichtung mit geringem Kraftaufwand möglich sein, damit eine problemlose Handhabung möglich ist. Darüber hinaus muß dafür Sorge getragen werden, daß durch die Arretiereinrichtung die Schwenkbewegung im ausgelösten Zustand nicht behindert und lediglich durch die wirksam werdende Gasfeder gedämpft wird.The gas spring arrangements described above are intended to meet two competing requirements. On the one hand, the locking device should enable an absolutely secure fixation, for example, in spite of the relatively high torques that occur. B. the seat or the backrest in a certain inclination position; on the other hand, it should be possible to actuate the locking device with little effort, so that problem-free handling is possible. In addition, care must be taken to ensure that the pivoting movement in the triggered state is not hindered by the locking device and is only damped by the gas spring which takes effect.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine Gasfederanordnung der eingangs genannten Art so auszubilden, daß bei leichter Lösbarkeit eine zuverlässige Arretierung ermöglicht wird, wobei eine möglichst einfache und damit gleichermaßen betriebssichere als auch kostengünstig realisierbare Konstruktion angestrebt wird.Proceeding from this, the object of the invention is to design a gas spring arrangement of the type mentioned at the outset in such a way that reliable detachment is made possible with easy detachability, the aim being a construction which is as simple as possible and thus equally reliable and inexpensive to implement.

Diese Aufgabe wird gelöst gemäß dem kennzeichnenden Teil von Anspruch 1. Durch die danach vorgesehene Parallelanordnung von ineinandergreifenden Hülsen-Kolbenteilen zu der Gasfeder wird erreicht, daß bei einem Verspannen des Hülsenteils gegen das Kolbenteil durch Anziehen des Gewindebolzens eine flächige Pressung zwischen diesen entsteht, welche eine hohe, auch bei häufiger Betätigung konstant bleibende Arretierkraft ermöglicht, wobei darüber hinaus für die Arretiereinrichtung keine zusätzlichen Befestigungseinrichtungen vorgesehen werden müssen, sondern die zur Festlegung der Gasfeder ohnehin erforderlichen Querstreben verwendet werden können.This object is achieved according to the characterizing part of claim 1. The parallel arrangement of intermeshing sleeve piston parts to the gas spring ensures that when the sleeve part is braced against the piston part by tightening the threaded bolt, a flat pressure is generated between them, which creates a high locking force, which remains constant even with frequent actuation, wherein, in addition, no additional fastening devices have to be provided for the locking device, but rather the cross struts which are required anyway for fixing the gas spring can be used.

Eine besonders gute Flächenpressung wird bei einer Ausgestaltung gemäß Anspruch 2 erreicht.A particularly good surface pressure is achieved in an embodiment according to claim 2.

Durch die gemäß Anspruch 3 vorgesehenen konstruktiven Maßnahmen wird erreicht, daß Kolbenteil und Hülsenteil relativ zueinander problemlos verspsnnbar sind, und daß im gelösten Zustand der Arretiereinrichtung die freie Schwenkbewegung nicht durch Klemmung behindert wird.The constructive measures provided in accordance with claim 3 ensure that the piston part and sleeve part can be braced relative to one another without any problems, and that the free pivoting movement is not impeded by clamping in the released state of the locking device.

Die Ausgestaltung nach Anspruch 4 sorgt dafür, daß trotz des vorgesehenen axialen Spiels ein Anschlag insbesondere bei der Handhabung des Betätigungsgriffes das Hülsen- und Kolbenteil fixiert.The embodiment according to claim 4 ensures that a stop, in particular when handling the actuating handle, fixes the sleeve and piston part despite the provided axial play.

Durch die Maßnahme nach Anspruch 5 wird in einfacher Weise dafür gesorgt, daß unter Aufrechterhaltung des gewünschten axialen Spiels trotzdem eine unkontrollierte axiale Bewegung, welche auch zu einer undefinierten Lage des Betätigungsgriffes führen würde, vermieden wird.The measure according to claim 5 ensures in a simple manner that while maintaining the desired axial play an uncontrolled axial movement, which would also lead to an undefined position of the actuating handle, is avoided.

Die Ausgestaltung nach Anspruch 6 ermöglicht es, eine besonders einfach ausgestaltete und damit kostengünstig herstellbare Feder zu verwenden.The embodiment according to claim 6 makes it possible to use a spring which is of particularly simple design and is therefore inexpensive to manufacture.

Durch die Maßnahme nach Anspruch 7 wird eine sehr einfache Montierbarkeit der Feder ermöglicht.The measure according to claim 7 enables the spring to be assembled very easily.

Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der folgenden Beschreibung einer bevorzugten Ausführungsform anhand der Zeichnung. Dabei zeigen

  • Fig. 1 eine schematische Seitenansicht eines Bürostuhls,
  • Fig. 2 eine Seitenansicht des Anlenkungsbereichs des Sitzträgers am Grundgestell und
  • Fig. 3 einen Schnitt längs der Linie A-A' in Fig. 2.
Further features, advantages and details of the invention result from the following description of a preferred embodiment with reference to the drawing. Show
  • 1 is a schematic side view of an office chair,
  • Fig. 2 is a side view of the articulation area of the seat support on the base frame and
  • 3 shows a section along the line AA ′ in FIG. 2.

Ein in Fig. 1 dargestellter Bürostuhl umfaßt ein Fußgestell 1 mit einer Tragsäule 2, welche mit einem den gepolsterten Sitz 3 aufnehmenden Sitzträger 4 verbunden ist. In Fig. ist lediglich die Verkleidung 5 des Sitzträgers 4 dargestellt.An office chair shown in FIG. 1 comprises a base frame 1 with a support column 2 which is connected to a seat support 4 receiving the upholstered seat 3. In Fig. Only the lining 5 of the seat support 4 is shown.

Mit dem Sitzträger 4 um eine Schwenkachse 6 schwenkbar verbunden ist ein Rückenlehnentrageteil 7, an welchem die die Rückenlehne 8 tragende Rückenlehnentragsäule 9 befestigt ist.A backrest support part 7, to which the backrest support column 9 carrying the backrest 8 is fastened, is connected to the seat support 4 so as to be pivotable about a pivot axis 6.

Der Sitz 3 ist, wie im einzelnen nicht dargestellt, einerseits mit dem Sitzträger 4 an dessen vorderem Ende und andererseits mit dem Rückenlehnentrageteil 7 gelenkig verbunden. Die gelenkige Verbindung zwischen dem Sitzträger 4 und dem Rückenlehnentrageteil 7 wird durch einen Schwenkbolzen 10 hergestellt, welcher die Seitenwände 11,12 bzw. 13,14 des Rückenlehnentrageteils 7 bzw. des Sitzträgers 4 durchsetzt. Das Rückenlehnentrageteil 7 und der Sitzträger 4 sind im Querschnitt jeweils U-förmig ausgebildet, wobei die U-Böden 15, 16 zur Oberseite, also zum Sitz hin weisen. Am hinteren Ende des Rückenlehnentrageteils 7 ist eine lösbare Befestigungseinrichtung 17 für die Rückenlehnen-Tragsäule angeordnet.As is not shown in detail, the seat 3 is articulated on the one hand to the seat support 4 at its front end and on the other hand to the backrest support part 7. The articulated Connection between the seat support 4 and the backrest support part 7 is established by a pivot pin 10 which passes through the side walls 11, 12 and 13, 14 of the backrest support part 7 and the seat support 4, respectively. The backrest support part 7 and the seat support 4 are each U-shaped in cross-section, the U-bottoms 15, 16 pointing towards the top, that is to say towards the seat. At the rear end of the backrest support part 7, a releasable fastening device 17 for the backrest support column is arranged.

Zur Dämpfung der Schwenkbewegung des Rückenlehnentrageteils 7 um die Achse 6 ist eine Gasfeder 19 vorgesehen. Das gehäuseseitige Ende 20 der Gasfeder 19 ist mittels einer an dem Gehäuse 21 der Gasfeder 19 befestigten Ringhülse 22 schwenkbar an einem Bolzen 23 festgelegt, der die Seitenwände 11, 12 des Rückenlehnentrageteils 7 durchsetzt und mittels der Köpfe 24 festgelegt ist.A gas spring 19 is provided to dampen the pivoting movement of the backrest support part 7 about the axis 6. The end 20 of the gas spring 19 on the housing side is pivotally attached to a bolt 23 by means of an annular sleeve 22 fastened to the housing 21 of the gas spring 19, which bolt passes through the side walls 11, 12 of the backrest support part 7 and is fixed by means of the heads 24.

Der Kolben 25 ist mit einer, eine Distanzfunktion wahrnehmenden Ringhülse 26 verbunden, welche schwenkbar auf einem als Querstrebe wirkenden Bolzen 27 angeordnet ist, der die Seitenwände 13, 14 des Sitzträgers 4 durchsetzt und dort festgelegt ist. Der Bolzen 23 ist im Bereich der Oberkante 28 des Rückenlehnentrageteils 7 angeordnet, während der Bolzen 27 im Bereich der Unterkante des Sitzträgers 4 unterhalb des Schwenkbolzens 10 angeordnet ist, wobei die Bolzen 23, 27 derart relativ zueinander liegen, daß die Gasfeder 19 etwa einen Winkel von 30 bis 45° mit der Ebene des Sitzes 3 einschließt. Hierdurch ist es möglich, die Bewegung der Rückenlehne 8 relativ zu dem Sitzträger 4 abzufedern, ohne daß die Verwendung zusätzlicher, die Rückbewegung der Hückenlehne bewerkstelligender Gegenfedern erforderlich wird.The piston 25 is connected to an annular sleeve 26 which performs a distance function and which is pivotably arranged on a bolt 27 which acts as a cross strut and passes through the side walls 13, 14 of the seat support 4 and is fixed there. The bolt 23 is arranged in the region of the upper edge 28 of the backrest support part 7, while the bolt 27 is arranged in the region of the lower edge of the seat support 4 below the pivot bolt 10, the bolts 23, 27 being relative to one another such that the gas spring 19 is approximately an angle from 30 to 45 ° with the plane of the seat 3. This makes it possible to cushion the movement of the backrest 8 relative to the seat support 4 without the need to use additional counter-springs which bring about the back movement of the backrest.

Etwa parallel zu der Gasfeder 19 ist die Arretiereinrichtung 29 angeordnet. Diese umfaßt ein Kolbenteil 30 und ein in Fig. 3 teilweise aufgebrochen dargestelltes Hülsenteil 31. Kolbenteil 30 und Hülsenteil 31 sind im Querschnitt rechteckig ausgebildet, wobei das Kolbenteil 30 in das Hülsenteil 31 längsverschieblich eingreift. Das Kolbenteil 30 weist eine Bohrung 32 auf, welche von dem Bolzen 27 durchsetzt wird. Eine Distanzhülse 33 hält das Kolbenteil 30 auf einer vorgewählten Mindestdistanz zur Ringhülse 26 und damit zur Gasfeder 19.The locking device 29 is arranged approximately parallel to the gas spring 19. This comprises a piston part 30 and a sleeve part 31 shown partially broken open in FIG. 3. The piston part 30 and the sleeve part 31 are rectangular in cross-section, the piston part 30 engaging in the sleeve part 31 so as to be longitudinally displaceable. The piston part 30 has a bore 32 which is penetrated by the bolt 27. A spacer sleeve 33 holds the piston part 30 at a preselected minimum distance from the annular sleeve 26 and thus from the gas spring 19.

Das Hülsenteil 31 weist ebenfalls eine Bohrung 33' auf, durch welche der Bolzen 23 geht. An der Innenseite 34 des Hülsenteils 31 liegt ein U-förmiger Feder-Bügel 35 mit einem Schenkel 36 an, wobei sich der andere Schenkel 37 an der Innenseite der Seitenwand 13 abstützt.The sleeve part 31 also has a bore 33 'through which the bolt 23 passes. A U-shaped spring clip 35 with one leg 36 bears against the inside 34 of the sleeve part 31, the other leg 37 being supported on the inside of the side wall 13.

Die Außenseite 38 des Hülsenteils 31 weist eine Bohrung 39 auf. Im Bereich dieser Bohrung 39 ist ein Gewindeaufsatz 40 angeschweißt, welcher von einem Kunststoffdistanzstück 41 umgeben wird. In den Gewindeaufsatz 40 ist ein Gewindebolzen 42 eingeschraubt, an dessen rückwärtigem Ende ein Betätigungsgriff 43 befestigt ist. Der Gewindebolzen 42 durchsetzt eine Bohrung 44 in der Seitenwand 12 und eine eine ungehinderte Schwenkbewegung erlaubende, etwa kreisabschnittsförmige Ausnehmung 45 in der Seitenwand 14.The outside 38 of the sleeve part 31 has a bore 39. In the area of this bore 39, a threaded attachment 40 is welded, which is surrounded by a plastic spacer 41. A threaded bolt 42 is screwed into the threaded attachment 40, and an actuating handle 43 is attached to the rear end thereof. The threaded bolt 42 passes through a bore 44 in the side wall 12 and an approximately circular segment-shaped recess 45 in the side wall 14 which allows an unimpeded pivoting movement.

Die erfindungsgemäße Gasfederanordnung funktioniert so, daß dann wenn der Gewindebolzen 42 gelöst ist, eine freie Schwenkbewegung zwischen dem Rückenlehnentrageteil 7 und dem Sitzträger 4 möglich ist, welche durch die Gasfeder 19 so gedämpft wird, daß keine zusätzliche Gegenfeder zur Rückholung der Hückenlehne 8 erforderlich ist. Durch ein Verdrehen des Betätigungsgriffes 43 wird der Gewindebolzen 42 in den Gewindeaufsatz 40 eingeschraubt, das vordere Ende 46 des Gewindebolzens 42 drückt gegen das Kolbenteil 30 und dieses gegen die Innenwand des Hülsenteils 31 und preßt das Kolbenteil 30 dort derart flächig an, daß trotz eines nur geringen erforderlichen Drehmoments zur Betätigung des Griffs 43 eine absolut zuverlässige Arretierung der Rückenlehnenverstellung erreicht wird.The gas spring arrangement according to the invention works so that when the threaded bolt 42 is loosened, a free pivoting movement between the backrest support part 7 and the seat support 4 is possible, which is damped by the gas spring 19 so that no additional counter-spring is required to retrieve the backrest 8. By turning the actuating handle 43, the threaded bolt 42 is screwed into the threaded attachment 40, the front end 46 of the threaded bolt 42 presses against the piston part 30 and this against the inner wall of the sleeve part 31 and presses the piston part 30 there in such a way that despite one only low torque required to actuate the handle 43 an absolutely reliable locking of the backrest adjustment is achieved.

Claims (7)

1. A gas spring arrangement comprising a gas spring (19), disposed between two elements pivotable in relation to one another around a pivot axis (6), which damps the pivot movement, and a mechanical arrangement with an activating lever for the releasable adjustment of the pivot movement, especially for the inclination adjustment of the backrest (8) of office chairs, wherein the gas spring (19) is fastened between two transverse struts (bolts 23, 27), which are each disposed on an element (seat carrier 4, backrest support part 7) parallel to the pivot axis (6), characterised in that the mechanical adjustment means (29) comprises a sheath part (31) and a piston part (30), longitudinally movable in the shesth part (31), in that the sheath part (31) and the piston part (30) are connected to one of the transverse struts (bolts 23, 27) and are disposed generally parallel to the gas spring (19), and in that the sheath part (31) has a lateral threaded bore (bore 39, threaded top 40), into which a threaded bolt (42) disposed at the front end of the activating lever (43) can be screwed in such a way, that the piston part (30) can be braced against the sheath part (31).
2. A gas spring arrangement in accordance with patent claim 1, characterised in that the sheath part (31) and the piston part (30) are formed with a rectangular cross section.
3. A gas spring arrangement in accordance with patent claims 1 and 2, characterised in that the sheath part (31) and the piston part (30) are fastened with axial free play to the transverse struts (bolts 23, 27).
4. A gas spring arrangement in accordance with patent claim 3, characterised in that a detent (limiting sheath 33) is disposed on the transverse strut (bolt 27) supporting the piston part (30), which limits its axial movement in the direction of the gas spring (19).
5. A gas spring arrangement in accordance with patent claim 3, characterised in that a spring (spring clip 35) is disposed on the transverse strut (bolt 23) supporting the sheath part (31), which acts on the latter parallel to the pivot axis (6).
6. A gas spring arrangement in accordance with patent claim 5, characterised in that the spring is formed approximately as a U-shaped spring clip (35).
7. A gas spring arrangement in accordance with patent claim 6, characterised in that open fastening indentations are disposed at the ends of the legs (36, 37) of the spring clip.
EP85110541A 1984-10-24 1985-08-22 Arrangement of a pneumatic spring, particularly for the backrest support of an office chair Expired EP0179224B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85110541T ATE42451T1 (en) 1984-10-24 1985-08-22 GAS SPRING ARRANGEMENT, PARTICULARLY FOR THE BACKREST SUPPORT PART OF OFFICE CHAIRS.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3438843 1984-10-24
DE3438843 1984-10-24
DE19853509049 DE3509049A1 (en) 1984-10-24 1985-03-14 GAS SPRING ARRANGEMENT, ESPECIALLY FOR THE BACKREST SUPPORT PART ON OFFICE CHAIRS
DE3509049 1985-03-14

Publications (3)

Publication Number Publication Date
EP0179224A2 EP0179224A2 (en) 1986-04-30
EP0179224A3 EP0179224A3 (en) 1987-04-29
EP0179224B1 true EP0179224B1 (en) 1989-04-26

Family

ID=25825902

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110541A Expired EP0179224B1 (en) 1984-10-24 1985-08-22 Arrangement of a pneumatic spring, particularly for the backrest support of an office chair

Country Status (4)

Country Link
US (1) US4641886A (en)
EP (1) EP0179224B1 (en)
AT (1) ATE42451T1 (en)
DE (2) DE3509049A1 (en)

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US6007150A (en) * 1998-03-08 1999-12-28 Milsco Manufacturing Company Motorcycle seat with adjustable backrest
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Also Published As

Publication number Publication date
US4641886A (en) 1987-02-10
ATE42451T1 (en) 1989-05-15
EP0179224A2 (en) 1986-04-30
DE3569659D1 (en) 1989-06-01
EP0179224A3 (en) 1987-04-29
DE3509049A1 (en) 1986-04-24

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