EP0511500B1 - Blockable lifting device for continuously adjusting a seat - Google Patents

Blockable lifting device for continuously adjusting a seat Download PDF

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Publication number
EP0511500B1
EP0511500B1 EP92105397A EP92105397A EP0511500B1 EP 0511500 B1 EP0511500 B1 EP 0511500B1 EP 92105397 A EP92105397 A EP 92105397A EP 92105397 A EP92105397 A EP 92105397A EP 0511500 B1 EP0511500 B1 EP 0511500B1
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EP
European Patent Office
Prior art keywords
tube
guide tube
guide
elevating mechanism
additional
Prior art date
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Expired - Lifetime
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EP92105397A
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German (de)
French (fr)
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EP0511500A1 (en
Inventor
Helge Siegner
Ludwig Stadelmann
Herbert Wolf
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Suspa Compart AG
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Suspa Compart AG
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Publication of EP0511500A1 publication Critical patent/EP0511500A1/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
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder

Definitions

  • the invention relates to a lockable lifting device according to the preamble of claim 1.
  • the cylindrical outer surface of the housing of the gas spring is guided directly in a guide bush connected to the guide tube.
  • the gas spring is therefore not only a load-bearing and adjustable length, but also a guiding and rotating element of a chair or table column. Since the piston rod in the base plate of the guide tube is not only freely rotatable, but is also fixed radially with sufficient play, the gas spring can align itself according to any changing load directions on the seat or table top, thereby eliminating the risk of jamming in the guide bushing.
  • Length-adjustable gas springs of the type used here are known from DE-PS 18 12 282 (corresponding to US Pat. No. 3,656,593 and JP-PS 846 405). These gas springs can additionally have a protective tube firmly connected to their housing, as is known from EP 0 133 524 B1 (corresponding to US Pat. No. 4,979,718 corresponding to JP-60 54446 U1).
  • the gas spring is the most complex and expensive component. Accordingly, it is desirable to be able to realize as many different chairs, tables or similar furniture parts as possible with as few different types of gas springs as possible. Design limits are achieved primarily in that the maximum stroke is limited by the configuration described above.
  • the object of the invention is to increase the stroke of such devices without intervention in the construction of the gas spring.
  • the characterizing part of claim 1 the combination of a telescope arrangement is therefore provided with a mechanical spring in addition to the gas spring due to the additional tube, which allows an extended stroke.
  • the housing of the gas spring When loading from above, e.g. when a person sits on the seat of the seat, when the lifting device is shortened, the housing of the gas spring is first moved relative to the piston rod until e.g. the seat support or another stop, which is axially fixed to the housing of the gas spring, comes to rest on the upper end face of the additional tube or the first guide bushing used there. Only the force of the gas spring acts during this path.
  • the mechanical spring is advantageously designed as a helical compression spring, so that it can advantageously be arranged in the region of the additional tube or the guide tube.
  • the helical spring is arranged surrounding the upper end of the additional tube between an annular collar at the free end of the additional tube and the front end of the guide tube.
  • This collar can be realized in a simple manner by bending the upper end of the additional tube.
  • the opposite stop of the helical spring is formed by the second guide bush or by the outer edge of the guide tube.
  • the helical spring is arranged in the interior of the guide tube and is supported on the one hand against the lower end face of the additional tube and on the other hand against an inner stop of the guide tube. This can be done by a separate ring collar or e.g. be formed by the bottom plate of the guide tube.
  • the additional tube can advantageously have an end stop which engages behind an edge of the second guide bush facing the base plate. In this way, a simple axial fixing of the second guide bush relative to the additional tube is possible.
  • the end stop can be formed by widening the corresponding end of the additional tube or, according to another advantageous embodiment, can engage behind the second guide bush in an elastically resilient manner radially to the central longitudinal axis.
  • the second guide bush has at least one elastic holding projection in the region of its upper end facing away from the bottom plate of the guide tube, which, together with a projection on the upper edge of the guide tube, forms an axial locking device.
  • a thrust ring can be provided on the outside of the housing of the gas spring in the area of the attachment of a seat carrier.
  • a lifting device shown in Fig. 1 comprises a lower guide tube 1, which is substantially cylindrical, but in its lower region has a downwardly tapering section 2, which is used for receiving in a corresponding hub 3 of a base frame 4.
  • the guide tube 1 is provided in the region of its lower end with a base plate 5 which has an opening 7 which is concentric with the central longitudinal axis 6 of the entire lifting device and thus also with the guide tube 1.
  • a length-adjustable, hydraulically or pneumatically lockable gas spring 8 is provided, the cylindrical housing 9 of which extends in the upper region of the guide tube 1 or beyond it.
  • the associated piston rod 10 protrudes downward from the housing 9 and is detachably connected to the base plate 5.
  • the free end of the piston rod 10 is formed with a reduced-diameter pin 11, on which an axial ball bearing 12 is arranged, the upper race 13 of which is supported against the collar 14 formed at the transition between the pin 11 and the piston rod 10, while the lower race 15 is supported against the base plate 5.
  • the pin 11 passes through the opening 7 with a sufficient radial play of a few tenths of a millimeter to one millimeter, so that the piston rod 10 is not radially clamped relative to the guide tube 1. From the outside, that is, from below, a washer 17 is pushed onto the pin 11, the diameter of which is larger than the diameter of the opening 7. A securing element 18 is inserted in such a way that the piston rod 10 of the gas spring 8 is axially fixed but detachable with the guide tube 1 connected is. On the piston rod 10 there is an approximately ring-cylindrical end position or stop damper 19 made of rubber, which bears with its underside against the upper race 13 of the axial ball bearing 12. The embodiment described so far is known from DE 38 33 959 A1 (corresponding to US Pat. No. 4,969,619 and JP Hei-1-257 991).
  • An additional tube 20 is inserted into the guide tube 1 from the top thereof.
  • the additional tube 20 is bent outwards at its lower end to form an end stop 21.
  • the end stop 21 lies against an edge 21a of a plastic guide bushing 22 facing the base plate 5.
  • the guide bushing 22 has, on its area opposite the edge 21a, radially resilient holding projections 23 to the central longitudinal axis 6.
  • inward projections 24 are provided, which are engaged by the resilient holding projections 23 and thus form an axial stop for them. This prevents the additional tube 20 from axially emerging from the guide tube 1 with the guide bushing 22 facing upward.
  • the end stop 21 is provided with slots 21b so that the additional tube 20 can be inserted into the guide bush 22.
  • the end stop 21 is bent elastically towards the central longitudinal axis 6 and springs up elastically at the end of the insertion, so that it then lies behind the edge 21a.
  • the guide bushing 22 is secured against pushing the guide bush 22 into the guide tube 1 by a stop edge 22a which bears against the upper free edge of the guide tube 1.
  • the guide bush 22 is thus fixed in the guide tube 1 in both directions of the central longitudinal axis 6.
  • the guide bush 22 is supported in a known manner radially against the guide tube 1 by means of ribs 22b.
  • the free upper end of the additional tube 20 is bent outwards to form an annular collar 25.
  • a helical compression spring 26 rests on the one hand on the underside of this collar 25 and on the other hand on the upper side or end face of the guide bushing 22 fixed in the guide tube 1 and accordingly presses the additional tube 20 into an extended position in the direction away from the base plate 5, specifically in the position shown in Fig. 1 in which the end stop 21 bears against the associated edge 21a of the guide bush 22.
  • a further guide bushing 27 is arranged, which rests with an edge bead 28 on the annular collar 25 of the additional tube 20 and is thus secured against slipping axially into the additional tube 20.
  • the housing 9 of the gas spring 8 is mounted in the guide bushing 27 so as to be axially movable in the direction of the central longitudinal axis 6.
  • a conical fastening section 29 is formed thereon, which engages in a holding cone 30 of a seat support 31, which is only indicated schematically.
  • a thrust ring 32 is axially immovable.
  • An actuating pin 34 protrudes from the fastening section 29, by means of which a valve located in the housing 9 of the gas spring 8 can be opened or closed. If the valve is closed, the gas spring is largely blocked, i.e. the piston rod 10 is not freely displaceable relative to the housing 9. If, on the other hand, the valve is opened by pushing the actuating pin 34 in, the total length of the gas spring can be changed by pushing the piston rod 10 into the housing 9 or by moving the piston rod 10 out of the housing 9.
  • Such length-adjustable or lockable gas springs 8 are generally known, for example from DE-PS 18 12 282 (corresponding to US-PS 3,656,593 and JP-PS 846 405).
  • the mode of operation is as follows, starting from the position shown in Fig. 1, in which the piston rod 10 is fully extended from the housing 9, so that the lifting device has its maximum length overall.
  • the length adjustment of the gas spring 8 takes place when the actuating pin 34 is pushed into its housing 9.
  • the housing 9 of the gas spring 8 first moves in the guide bushing 27 by the path A until the underside of the thrust ring 32, or if such is not provided, the lower edge of the seat support 31 comes to rest on the annular collar 25 or the annular bead 28.
  • the additional tube 20 becomes relative by compressing the coil spring 26 moved to the guide bush 22 until the coil spring 26 is fully compressed.
  • a route B is traveled through here.
  • an overall stroke C which is extended from the sum of A + B, is achieved compared to conventional chair columns, without changes having to be made to the gas spring 8 itself.
  • the total stroke C of the lifting device can thus be made relatively large, on the other hand, sufficient guidance of the housing 9 of the gas spring 8 is still ensured even when the gas spring 8 is largely or fully extended.
  • Fig. 2 shows a variant in which a helical compression spring is not arranged between the collar 25 of the additional tube 20 and the end face of the guide bush 22. Rather, a helical compression spring 26a is supported on the one hand against the base plate 5 and on the other hand against the end stop 21 of the additional tube 20. This also causes the additional tube 20 to be acted on in the direction away from the base plate 5 of the guide tube 1. With the difference that the helical compression spring 26 is not present, the lifting device according to FIG. 2 is otherwise identical to that according to FIG. 1, so that only the lower section has to be shown.
  • the overall spring characteristic of gas spring 8 on the one hand and helical compression spring 26 or 26a on the other hand is steeper.
  • the housing 9 of the gas spring 8 is already relieved by the described forces on the stop damper 19. The length adjustment during path B is thus cushioned more or damped.

Landscapes

  • Chairs Characterized By Structure (AREA)
  • Tables And Desks Characterized By Structural Shape (AREA)
  • Fluid-Damping Devices (AREA)

Description

Die Erfindung bezieht sich auf eine blockierbare Hubvorrichtung nach dem Oberbegriff des Anspruches 1.The invention relates to a lockable lifting device according to the preamble of claim 1.

Bei einer derartigen aus der DE-PS 19 31 o12 (entsprechend US-PS 3 711 054 und JP-PS 892 209) bekannten Hubvorrichtung wird die insoweit zylindrische Außenfläche des Gehäuses der Gasfeder unmittelbar in einer mit dem Führungsrohr verbundenen Führungsbuchse gefuhrt. Die Gasfeder ist also nicht nur tragendes und längenverstellbares, sondern auch führendes und drehbares Element einer Stuhl- oder Tischsäule. Da die Kolbenstange in der Bodenplatte des Führungsrohres nicht nur frei drehbar, sondern auch radial mit einem ausreichenden Spiel befestigt ist, kann sich die Gasfeder entsprechend etwaigen wechselnden Belastungsrichtungen der Sitzfläche bzw. Tischplatte ausrichten wodurch die Gefahr eines Verklemmens in der Führungsbuchse aufgehoben wird.In such a lifting device known from DE-PS 19 31 o12 (corresponding to US Pat. No. 3,711,054 and JP-PS 892 209), the cylindrical outer surface of the housing of the gas spring is guided directly in a guide bush connected to the guide tube. The gas spring is therefore not only a load-bearing and adjustable length, but also a guiding and rotating element of a chair or table column. Since the piston rod in the base plate of the guide tube is not only freely rotatable, but is also fixed radially with sufficient play, the gas spring can align itself according to any changing load directions on the seat or table top, thereby eliminating the risk of jamming in the guide bushing.

Längenverstellbare Gasfedern der hierbei eingesetzten Art sind aus der DE-PS 18 12 282 (entsprechend US-PS 3 656 593 und JP-PS 846 405) bekannt. Diese Gasfedern können zusätzlich ein fest mit ihrem Gehäuse verbundenes Schutzrohr aufweisen wie es aus der EP 0 133 524 B1 (entsprechend US-PS 4 979 718 entsprechend JP-60 54446 U1) bekannt ist.Length-adjustable gas springs of the type used here are known from DE-PS 18 12 282 (corresponding to US Pat. No. 3,656,593 and JP-PS 846 405). These gas springs can additionally have a protective tube firmly connected to their housing, as is known from EP 0 133 524 B1 (corresponding to US Pat. No. 4,979,718 corresponding to JP-60 54446 U1).

Bei diesen vorbekannten Vorrichtungen stellt die Gasfeder das konstruktiv aufwendigste und teuerste Bauteil dar. Dementsprechend ist es wünschensweg, mit möglichst wenig unterschiedlichen Typen von Gasfedern möglichst viele verschiedene Stühle, Tische oder ähnliche Möbelteile realisieren zu können. Dabei werden konstruktive Grenzen vor allem dadurch erreicht, daß der maximale Hubweg durch die vorstehend beschriebene Ausgestaltung begrenzt ist.In these previously known devices, the gas spring is the most complex and expensive component. Accordingly, it is desirable to be able to realize as many different chairs, tables or similar furniture parts as possible with as few different types of gas springs as possible. Design limits are achieved primarily in that the maximum stroke is limited by the configuration described above.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, den Hubweg derartiger Vorrichtungen ohne Eingriff in die Konstruktion der Gasfeder zu vergrößern.Proceeding from this, the object of the invention is to increase the stroke of such devices without intervention in the construction of the gas spring.

Diese Aufgabe wird erfindungsgemäß gelöst durch den kennzeichnenden Teil von Anspruch 1. Erfindungsgemäß ist also die Kombination einer Teleskopanordnung aufgrund des zusätzlichen Rohres, welches einen erweiterten Hubweg gestattet, mit einer mechanischen Feder zusätzlich zu der Gasfeder vorgesehen.This object is achieved according to the invention by the characterizing part of claim 1. According to the invention, the combination of a telescope arrangement is therefore provided with a mechanical spring in addition to the gas spring due to the additional tube, which allows an extended stroke.

Bei der Belastung von oben, also z.B. dann wenn sich eine Person auf die Sitzfläche des Sitzes setzt, wird bei einem Verkürzen der Hubvorrichtung zunächst das Gehäuse der Gasfeder relativ zu der Kolbenstange verfahren, bis z.B. der Sitzträger oder ein anderer Anschlag, der axial fest an dem Gehäuse der Gasfeder angebracht ist, zur Anlage an der oberen Stirnseite des zusätzlichen Rohres bzw. der dort eingesetzten ersten Führungsbuchse gelangt. Während dieses Weges wirkt nur die Kraft der Gasfeder.When loading from above, e.g. when a person sits on the seat of the seat, when the lifting device is shortened, the housing of the gas spring is first moved relative to the piston rod until e.g. the seat support or another stop, which is axially fixed to the housing of the gas spring, comes to rest on the upper end face of the additional tube or the first guide bushing used there. Only the force of the gas spring acts during this path.

Nach Erreichen dieser Anschlagposition wird ein zweiter Federweg zurückgelegt, und zwar gegen die Federwirkung der mechanischen Feder und die Kraft der Gasfeder, bis entweder ein weiterer Anschlag erreicht ist oder die mechanische Feder nicht mehr weiter zusammendrückbar ist und somit selbst den Anschlag bildet.After this stop position has been reached, a second spring travel is covered, namely against the spring action of the mechanical spring and the force of the gas spring, until either another stop is reached or the mechanical spring can no longer be compressed and thus forms the stop itself.

Vorteilhafterweise ist die mechanische Feder als Schrauben-Druckfeder ausgebildet, so daß sie günstigerweise im Bereich des zusätzlichen Rohres bzw. des Führungsrohres angeordnet werden kann.The mechanical spring is advantageously designed as a helical compression spring, so that it can advantageously be arranged in the region of the additional tube or the guide tube.

Bei einer ersten vorteilhaften Ausführungsform ist vorgesehen, daß die Schraubenfeder das obere Ende des zusätzlichen Rohres umgebend zwischen einem Ringbund am freien Ende des zusätzlichen Rohres und dem stirnseitigen Ende des Führungsrohres angeordnet ist. Dieser Ringbund kann in einfacher Weise durch ein Umbiegen des oberen Endes des zusätzlichen Rohres realisiert werden Der gegenüberliegende Anschlag der Schraubenfeder ist durch die zweite Führungsbuchse oder durch den Außenrand des Führungsrohres gebildet.In a first advantageous embodiment it is provided that the helical spring is arranged surrounding the upper end of the additional tube between an annular collar at the free end of the additional tube and the front end of the guide tube. This collar can be realized in a simple manner by bending the upper end of the additional tube. The opposite stop of the helical spring is formed by the second guide bush or by the outer edge of the guide tube.

Alternativ zu dieser Ausführungsform kann auch vorgesehen sein, daß die Schraubenfeder im Inneren des Führungsrohres angeordnet ist und sich einerseits gegen die untere Stirnseite des zusätzlichen Rohres und andererseits gegen einen inneren Anschlag des Führungsrohres abstützt. Dieser kann durch einen gesonderten Ringbund oder aber auch z.B. durch die Bodenplatte des Führungsrohres gebildet sein.As an alternative to this embodiment, it can also be provided that the helical spring is arranged in the interior of the guide tube and is supported on the one hand against the lower end face of the additional tube and on the other hand against an inner stop of the guide tube. This can be done by a separate ring collar or e.g. be formed by the bottom plate of the guide tube.

Das zusätzliche Rohr kann günstigerweise einen Endanschlag aufweisen, der einen der Bodenplatte zugewandten Rand der zweiten Führungsbuchse hintergreift. Auf diese Weise ist eine einfache axiale Festlegung der zweiten Führungsbuchse relativ zum zusätzlichen Rohr möglich.The additional tube can advantageously have an end stop which engages behind an edge of the second guide bush facing the base plate. In this way, a simple axial fixing of the second guide bush relative to the additional tube is possible.

Dabei kann der Endanschlag durch ein Aufweiten des entsprechenden Endes des zusätzlichen Rohres ausgebildet werden oder aber gemäß einer anderen vorteilhaften Ausführungsform die zweite Führungsbuchse radial zur Mittel-Längsachse elastisch federnd hintergreifen.The end stop can be formed by widening the corresponding end of the additional tube or, according to another advantageous embodiment, can engage behind the second guide bush in an elastically resilient manner radially to the central longitudinal axis.

Mit Vorteil kann weiterhin vorgesehen sein, daß die zweite Führungsbuchse im Bereich ihres oberen, der Bodenplatte des Führungsrohres abgewandten Endes mindestens einen elastischen Haltevorsprung aufweist, der zusammen mit einem Vorsprung am oberen Rand des Führungsrohres eine axiale Verschiebesicherung bildet.It can also be advantageously provided that the second guide bush has at least one elastic holding projection in the region of its upper end facing away from the bottom plate of the guide tube, which, together with a projection on the upper edge of the guide tube, forms an axial locking device.

Zur Erzielung eines definierten Anschlages kann an der Außenseite des Gehäuses der Gasfeder im Bereich der Befestigung eines Sitzträgers ein Schubring vorgesehen sein.To achieve a defined stop, a thrust ring can be provided on the outside of the housing of the gas spring in the area of the attachment of a seat carrier.

Weitere Einzelheiten, Vorteile und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung zweier Ausführungsbeispiele der Erfindung. Es zeigt

Fig. 1
einen Längsschnitt durch eine als Stuhlsäule ausgebildete Hubvorrichtung und
Fig. 2
einen Längsschnitt durch den unteren Teil einer gegenüber Fig. 1 abgewandelten Hubvorrichtung.
Further details, advantages and features of the invention result from the following description of two exemplary embodiments of the invention. It shows
Fig. 1
a longitudinal section through a lifting device designed as a column and
Fig. 2
a longitudinal section through the lower part of a modified lifting device compared to FIG. 1.

Eine in Fig. 1 dargestellte Hubvorrichtung umfaßt ein unteres Führungsrohr 1, welches im wesentlichen zylindrisch ausgeführt ist, in seinem unteren Bereich aber einen sich nach unten konisch verjüngenden Abschnitt 2 aufweist, der zur Aufnahme in einer entsprechenden Nabe 3 eines Fußgestells 4 dient.A lifting device shown in Fig. 1 comprises a lower guide tube 1, which is substantially cylindrical, but in its lower region has a downwardly tapering section 2, which is used for receiving in a corresponding hub 3 of a base frame 4.

Das Führungsrohr 1 ist im Bereich seines unteren Endes mit einer Bodenplatte 5 versehen, welche eine zur Mittel-Längsachse 6 der gesamten Hubvorrichtung und damit auch des Führungsrohres 1 konzentrische Öffnung 7 aufweist.The guide tube 1 is provided in the region of its lower end with a base plate 5 which has an opening 7 which is concentric with the central longitudinal axis 6 of the entire lifting device and thus also with the guide tube 1.

Ebenfalls konzentrisch zur Längsachse 6 ist eine längenverstellbare, hydraulisch oder pneumatisch blockierbare Gasfeder 8 vorgesehen, deren zylindrisches Gehäuse 9 sich im oberen Bereich des Führungsrohres 1 bzw. über diesen hinaus erstreckt. Die zugehörige Kolbenstange 10 ragt nach unten aus dem Gehäuse 9 heraus und ist mit der Bodenplatte 5 lösbar verbunden. Hierzu ist das freie Ende der Kolbenstange 10 mit einem im Durchmesser reduzierten Zapfen 11 ausgebildet, an dem ein Axial-Kugel-Lager 12 angeordnet ist, dessen oberer Laufring 13 sich gegen den am Übergang zwischen Zapfen 11 und Kolbenstange 10 ausgebildeten Ringbund 14 abstützt, während der untere Laufring 15 sich gegen die Bodenplatte 5 abstützt.Also concentric to the longitudinal axis 6, a length-adjustable, hydraulically or pneumatically lockable gas spring 8 is provided, the cylindrical housing 9 of which extends in the upper region of the guide tube 1 or beyond it. The associated piston rod 10 protrudes downward from the housing 9 and is detachably connected to the base plate 5. For this purpose, the free end of the piston rod 10 is formed with a reduced-diameter pin 11, on which an axial ball bearing 12 is arranged, the upper race 13 of which is supported against the collar 14 formed at the transition between the pin 11 and the piston rod 10, while the lower race 15 is supported against the base plate 5.

Der Zapfen 11 durchsetzt die Öffnung 7 mit einem ausreichenden radialen Spiel von einigen Zehntel Millimetern bis zu einem Millimeter, so daß die Kolbenstange 10 gegenüber dem Führungsrohr 1 nicht radial verspannt wird. Von außen, also von unten, ist auf den Zapfen 11 eine Beilagscheibe 17 aufgeschoben, deren Durchmesser größer ist als der Durchmesser der Öffnung 7. Ein Sicherungselement 18 ist derart eingeschoben, daß die Kolbenstange 10 der Gasfeder 8 axial fest aber lösbar mit dem Führungsrohr 1 verbunden ist. Auf der Kolbenstange 10 befindet sich ein etwa ringzylindrischer Endlagen- oder Anschlag-Dämpfer 19 aus Gummi, der mit seiner Unterseite gegen den oberen Laufring 13 des Axial-Kugel-Lagers 12 anliegt. Die bisher beschriebene Ausgestaltung ist aus der DE 38 33 959 A1 (entsprechend US-PS 4 969 619 und JP Hei-1-257 991) bekannt.The pin 11 passes through the opening 7 with a sufficient radial play of a few tenths of a millimeter to one millimeter, so that the piston rod 10 is not radially clamped relative to the guide tube 1. From the outside, that is, from below, a washer 17 is pushed onto the pin 11, the diameter of which is larger than the diameter of the opening 7. A securing element 18 is inserted in such a way that the piston rod 10 of the gas spring 8 is axially fixed but detachable with the guide tube 1 connected is. On the piston rod 10 there is an approximately ring-cylindrical end position or stop damper 19 made of rubber, which bears with its underside against the upper race 13 of the axial ball bearing 12. The embodiment described so far is known from DE 38 33 959 A1 (corresponding to US Pat. No. 4,969,619 and JP Hei-1-257 991).

Ein zusätzliches Rohr 20 ist in das Führungsrohr 1 von dessen Oberseite her eingeschoben.An additional tube 20 is inserted into the guide tube 1 from the top thereof.

Das zusätzliche Rohr 20 ist an seinem unteren Ende unter Ausbildung eines Endanschlages 21 nach außen umgebogen. Der Endanschlag 21 liegt gegen einen der Bodenplatte 5 zugewandten Rand 21a einer Führungsbuchse 22 aus Kunststoff an. Die Führungsbuchse 22 weist an ihrem dem Rand 21a entgegengesetzten Bereich radial zur Mittel-Längsachse 6 federnde Halte-Vorsprünge 23 auf. An dem oberen freien Ende des Führungsrohres 1 sind nach innen gerichtete Vorsprünge 24 vorgesehen, welche von den federnden Halte-Vorsprüngen 23 hintergriffen werden und so einen axialen Anschlag für diese bilden. Hierdurch wird verhindert, daß das zusätzliche Rohr 20 mit der Führungsbuchse 22 nach oben aus dem Führungsrohr 1 axial heraustreten kann. Der Endanschlag 21 ist mit Schlitzen 21b versehen, so daß das zusätzliche Rohr 20 in die Führungsbuchse 22 eingeschoben werden kann. Der Endanschlag 21 wird hierbei elastisch zur Mittel-Längsachse 6 hin verbogen und springt am Ende des Einschiebens elastisch auf, so daß er dann hinter dem Rand 21a liegt. Alternativ ist es naturgemäß auch möglich, den Endanschlag 21 erst nach dem Einschieben des zusätzlichen Rohres 20 in die Führungsbuchse 22 mit einem geeigneten Werkzeug umzubiegen. Gegen ein Hineinschieben der Führungsbuchse 22 in das Führungsrohr 1 ist erstere durch einen Anschlagrand 22a gesichert, der gegen den oberen freien Rand des Führungsrohres 1 anliegt. Die Führungsbuchse 22 ist also im Führungsrohr 1 in beiden Richtungen der Mittel-Längsachse 6 festgelegt. Die Führungsbuchse 22 stützt sich in bekannter Weise mittels Rippen 22b radial gegen das Führungsrohr 1 ab.The additional tube 20 is bent outwards at its lower end to form an end stop 21. The end stop 21 lies against an edge 21a of a plastic guide bushing 22 facing the base plate 5. The guide bushing 22 has, on its area opposite the edge 21a, radially resilient holding projections 23 to the central longitudinal axis 6. At the upper free end of the guide tube 1 inward projections 24 are provided, which are engaged by the resilient holding projections 23 and thus form an axial stop for them. This prevents the additional tube 20 from axially emerging from the guide tube 1 with the guide bushing 22 facing upward. The end stop 21 is provided with slots 21b so that the additional tube 20 can be inserted into the guide bush 22. The end stop 21 is bent elastically towards the central longitudinal axis 6 and springs up elastically at the end of the insertion, so that it then lies behind the edge 21a. Alternatively, it is naturally also possible to bend the end stop 21 only after the additional tube 20 has been inserted into the guide bushing 22 using a suitable tool. The guide bushing 22 is secured against pushing the guide bush 22 into the guide tube 1 by a stop edge 22a which bears against the upper free edge of the guide tube 1. The guide bush 22 is thus fixed in the guide tube 1 in both directions of the central longitudinal axis 6. The guide bush 22 is supported in a known manner radially against the guide tube 1 by means of ribs 22b.

Das freie obere Ende des zusätzlichen Rohres 20 ist unter Ausbildung eines Ringbundes 25 nach außen umgebogen. Eine Schrauben-Druckfeder 26 liegt einerseits an der Unterseite dieses Ringbundes 25 und andererseits an der Oberseite bzw. Stirnseite der im Führungsrohr 1 festgelegten Führungsbuchse 22 an und drückt dementsprechend das zusätzliche Rohr 20 in eine Ausfahrposition in Richtung weg von der Bodenplatte 5, und zwar in die in Fig. 1 dargestellte Stellung in der der Endanschlag 21 gegen den zugeordneten Rand 21a der Führungsbuchse 22 anliegt.The free upper end of the additional tube 20 is bent outwards to form an annular collar 25. A helical compression spring 26 rests on the one hand on the underside of this collar 25 and on the other hand on the upper side or end face of the guide bushing 22 fixed in the guide tube 1 and accordingly presses the additional tube 20 into an extended position in the direction away from the base plate 5, specifically in the position shown in Fig. 1 in which the end stop 21 bears against the associated edge 21a of the guide bush 22.

Im Inneren des oberen Teils des zusätzlichen Rohres 20 ist eine weitere Führungsbuchse 27 angeordnet, welche mit einem Randwulst 28 an dem Ringbund 25 des zusätzlichen Rohres 20 anliegt und somit gegen ein axiales Hineinrutschen in das zusätzliche Rohr 20 gesichert ist. Das Gehäuse 9 der Gasfeder 8 ist in der Führungsbuchse 27 in Richtung der Mittel-Längsachse 6 axial beweglich gelagert.In the interior of the upper part of the additional tube 20, a further guide bushing 27 is arranged, which rests with an edge bead 28 on the annular collar 25 of the additional tube 20 and is thus secured against slipping axially into the additional tube 20. The housing 9 of the gas spring 8 is mounted in the guide bushing 27 so as to be axially movable in the direction of the central longitudinal axis 6.

An dem freien, der Bodenplatte 5 abgewandten Ende des Gehäuses 9 ist an diesem ein konusförmiger Befestigungsabschnitt 29 ausgebildet, der in einen Haltekonus 30 eines nur schematisch angedeuteten Sitzträgers 31 eingreift. An der Außenseite des Gehäuses 9 unterhalb des Befestigungsabschnittes 29 ist weiterhin ein Schubring 32 axial unverschiebbar aufgesetzt.On the free end of the housing 9 facing away from the base plate 5, a conical fastening section 29 is formed thereon, which engages in a holding cone 30 of a seat support 31, which is only indicated schematically. On the outside of the housing 9 below the mounting portion 29, a thrust ring 32 is axially immovable.

Aus dem Befestigungsabschnitt 29 ragt ein Betätigungsstift 34 heraus, mittels dessen ein in dem Gehäuse 9 der Gasfeder 8 befindliches Ventil geöffnet oder geschlossen werden kann. Ist das Ventil geschlossen, so ist die Gasfeder weitgehend blockiert, d.h. die Kolbenstange 10 ist nicht frei gegenüber dem Gehäuse 9 verschiebbar. Wird dagegen das Ventil durch Hineinschieben des Betätigungsstiftes 34 geöffnet, so kann die Gesamtlänge der Gasfeder durch Hineinschieben der Kolbenstange 10 in das Gehäuse 9 oder durch Hinausfahren der Kolbenstange 10 aus dem Gehäuse 9 verändert werden. Derartige längenverstellbare bzw. blockierbare Gasfedern 8 sind allgemein bekannt, beispielsweise aus der DE-PS 18 12 282 (entsprechend US-PS 3 656 593 und JP-PS 846 405).An actuating pin 34 protrudes from the fastening section 29, by means of which a valve located in the housing 9 of the gas spring 8 can be opened or closed. If the valve is closed, the gas spring is largely blocked, i.e. the piston rod 10 is not freely displaceable relative to the housing 9. If, on the other hand, the valve is opened by pushing the actuating pin 34 in, the total length of the gas spring can be changed by pushing the piston rod 10 into the housing 9 or by moving the piston rod 10 out of the housing 9. Such length-adjustable or lockable gas springs 8 are generally known, for example from DE-PS 18 12 282 (corresponding to US-PS 3,656,593 and JP-PS 846 405).

Die Wirkungsweise ist wie folgt, wobei von der in Fig. 1 dargestellten Stellung ausgegangen wird, in der die Kolbenstange 10 vollständig aus dem Gehäuse 9 ausgefahren ist, so daß die Hubvorrichtung insgesamt ihre maximale Länge aufweist. Die Längenverstellung der Gasfeder 8 erfolgt bei in deren Gehäuse 9 hineingeschobenem Betätigungsstift 34. Bei einer Belastung der Stuhlsäule von oben in Richtung des Pfeils 33 verschiebt sich zunächst das Gehäuse 9 der Gasfeder 8 in der Führungsbuchse 27 um den Weg A, bis die Unterseite des Schubrings 32, bzw. falls ein solcher nicht vorgesehen ist, die Unterkante des Sitzträgers 31 zur Anlage an dem Ringbund 25 bzw. dem Ringwulst 28 gelangt. Nach diesem Weg A wird das zusätzliche Rohr 20 unter Zusammendrücken der Schraubenfeder 26 relativ zur Führungsbuchse 22 verschoben bis die Schraubenfeder 26 vollständig zusammengedrückt ist. Hierbei wird ein Weg B durchfahren. Insgesamt wird also ein gegenüber herkömmlichen Stuhlsäulen verlängerter aus der Summe A + B gebildeter Gesamthub C erreicht, ohne daß an der Gasfeder 8 selbst Änderungen vorgenommen werden müßten. Der Gesamthub C der Hubvorrichtung kann also relativ groß gemacht werden, wobei andererseits auch bei weitgehend oder vollständig ausgefahrener Gasfeder 8 noch eine ausreichende Führung des Gehäuses 9 der Gasfeder 8 sichergestellt ist.The mode of operation is as follows, starting from the position shown in Fig. 1, in which the piston rod 10 is fully extended from the housing 9, so that the lifting device has its maximum length overall. The length adjustment of the gas spring 8 takes place when the actuating pin 34 is pushed into its housing 9. When the chair column is loaded from above in the direction of arrow 33, the housing 9 of the gas spring 8 first moves in the guide bushing 27 by the path A until the underside of the thrust ring 32, or if such is not provided, the lower edge of the seat support 31 comes to rest on the annular collar 25 or the annular bead 28. After this path A, the additional tube 20 becomes relative by compressing the coil spring 26 moved to the guide bush 22 until the coil spring 26 is fully compressed. A route B is traveled through here. Overall, an overall stroke C, which is extended from the sum of A + B, is achieved compared to conventional chair columns, without changes having to be made to the gas spring 8 itself. The total stroke C of the lifting device can thus be made relatively large, on the other hand, sufficient guidance of the housing 9 of the gas spring 8 is still ensured even when the gas spring 8 is largely or fully extended.

Fig. 2 zeigt eine Variante, bei der eine Schrauben-Druckfeder nicht zwischen dem Ringbund 25 des zusätzlichen Rohres 20 und der Stirnseite der Führungsbuchse 22 angeordnet ist. Hierbei ist vielmehr eine Schrauben-Druckfeder 26a einerseits gegen die Bodenplatte 5 und andererseits gegen den Endanschlag 21 des zusätzlichen Rohres 20 abgestützt. Auch hierdurch wird bewirkt, daß das zusätzliche Rohr 20 in Richtung von der Bodenplatte 5 des Führungsrohres 1 weg beaufschlagt wird. Mit dem Unterschied, daß die Schrauben-Druckfeder 26 hierbei nicht vorhanden ist, ist ansonsten die Hubvorrichtung nach Fig. 2 identisch der nach Fig. 1, so daß nur der untere Abschnitt dargestellt sein muß.Fig. 2 shows a variant in which a helical compression spring is not arranged between the collar 25 of the additional tube 20 and the end face of the guide bush 22. Rather, a helical compression spring 26a is supported on the one hand against the base plate 5 and on the other hand against the end stop 21 of the additional tube 20. This also causes the additional tube 20 to be acted on in the direction away from the base plate 5 of the guide tube 1. With the difference that the helical compression spring 26 is not present, the lifting device according to FIG. 2 is otherwise identical to that according to FIG. 1, so that only the lower section has to be shown.

Dadurch daß beim teleskopartigen Einfahren des zusätzlichen Rohres 20 in das Führungsrohr 1 auch eine Kraft zum Zusammendrücken der Schrauben-Druckfeder 26 bzw. 26a aufgebracht werden muß, wird die Gesamtfedercharakteristik von Gasfeder 8 einerseits und Schrauben-Druckfeder 26 bzw. 26a andererseits steiler. Insbesondere wenn also während einer Längenverstellung der Gasfeder 8 eine schwergewichtige Person auf dem vom Sitzträger 31 getragenen Sitz sitzt, wird erreicht, daß das Gehäuse 9 der Gasfeder 8 bereits durch die geschilderten Kräfte entlastet auf dem Anschlag-Dämpfer 19 aufsetzt. Die Längenverstellung während des Weges B wird also stärker abgefedert bzw. federnd gedämpft.Characterized in that a force must be applied to compress the helical compression spring 26 or 26a when telescoping the additional tube 20 into the guide tube 1, the overall spring characteristic of gas spring 8 on the one hand and helical compression spring 26 or 26a on the other hand is steeper. In particular, if a heavyweight person sits on the seat carried by the seat support 31 during a length adjustment of the gas spring 8, it is achieved that the housing 9 of the gas spring 8 is already relieved by the described forces on the stop damper 19. The length adjustment during path B is thus cushioned more or damped.

Claims (8)

  1. Lockable elevating mechanism for the continuous adjustment of chair seats comprising a guide tube (1) to be connected with a pedestal (4) and a longitudinally adjustable, lockable gas spring (8), of which the piston rod (10) is axially tightly, but releasably connected with a bottom plate (5) of the guide tube (1) and of which the housing (9) is guided in the guide tube (1) and is axially tightly connectable with a chair seat (seat carrier 31) at the end opposite to the piston rod (10) and is displaceable laterally without play and in the direction of a common longitudinal axis (6),
    characterized in that
    a first guide bush (27) is arranged between the housing (9) and an additional tube (20), so that the housing (9) is supported for displacement relative to the additional tube (20) in the direction of the longitudinal axis (6),
    in that a second guide bush (22) is arranged between the additional tube (20) and the guide tube (1) and is arrested in relation to the guide tube (1) in the direction of the longitudinal axis (6) so that the additional tube (20) is in turn displaceable while axially guided in relation to the guide tube (1), and
    in that a mechanical helical compression spring (26, 26a) is provided between the additional tube (20) and the guide tube (1) and acts upon the additional tube (20) in a direction away from the bottom plate (5) of the guide tube (1).
  2. Elevating mechanism according to claim 1, characterized in that the mechanical spring is in the form of a helical compression spring (26, 26a).
  3. Elevating mechanism according to claim 2, characterized in that while surrounding the upper end of the additional tube (20), the mechanical helical compression spring (26, 26a) is arranged between a stop (annular collar 25) at the free end of the additional tube (20) and the front end of the guide tube (1).
  4. Elevating mechanism according to claim 2, characterized in that the helical spring (26) is arranged inside the guide tube (1) and bears against a lower front of the additional tube (20) on the one hand and against an internal stop (bottom plate 5) of the guide tube (1) on the other hand.
  5. Elevating mechanism according to claim 1, characterized in that the additional tube (20) has an abutment end (21) gripping from behind a rim (21) of the second guide bush (22) facing the bottom plate (5).
  6. Elevating mechanism according to claim 5, characterized in that the abutment end (21) grips the second guide bush (22) from behind elastically resiliently and radially in relation to the central longitudinal axis (6).
  7. Elevating mechanism according to claim 1, characterized in that in the vicinity of its upper end facing away from the bottom plate (5) of the guide tube (1), the second guide bush (22) has at least one elastic retaining projection (23) cooperating with a projection (24) at the upper rim of the guide tube (1) to form a safeguard against axial displacement.
  8. Elevating mechanism according to claim 1, characterized in that a thrust ring (32) is provided on the external surface of the housing (9) in the vicinity of where the seat carrier (31) is secured.
EP92105397A 1991-05-01 1992-03-28 Blockable lifting device for continuously adjusting a seat Expired - Lifetime EP0511500B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4114227 1991-05-01
DE4114227 1991-05-01
DE4207470A DE4207470A1 (en) 1991-05-01 1992-03-10 LOCKABLE LIFTING DEVICE FOR CONTINUOUSLY ADJUSTING CHAIR SEATS
DE4207470 1992-03-10

Publications (2)

Publication Number Publication Date
EP0511500A1 EP0511500A1 (en) 1992-11-04
EP0511500B1 true EP0511500B1 (en) 1995-05-17

Family

ID=25903286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92105397A Expired - Lifetime EP0511500B1 (en) 1991-05-01 1992-03-28 Blockable lifting device for continuously adjusting a seat

Country Status (4)

Country Link
US (1) US5188345A (en)
EP (1) EP0511500B1 (en)
JP (1) JP3307983B2 (en)
DE (2) DE4207470A1 (en)

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Also Published As

Publication number Publication date
US5188345A (en) 1993-02-23
DE4207470A1 (en) 1992-11-05
JPH05154022A (en) 1993-06-22
JP3307983B2 (en) 2002-07-29
EP0511500A1 (en) 1992-11-04
DE59202196D1 (en) 1995-06-22

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