EP0668037B1 - Guiding sleeve and telescopic column with guiding sleeve - Google Patents

Guiding sleeve and telescopic column with guiding sleeve Download PDF

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Publication number
EP0668037B1
EP0668037B1 EP94118815A EP94118815A EP0668037B1 EP 0668037 B1 EP0668037 B1 EP 0668037B1 EP 94118815 A EP94118815 A EP 94118815A EP 94118815 A EP94118815 A EP 94118815A EP 0668037 B1 EP0668037 B1 EP 0668037B1
Authority
EP
European Patent Office
Prior art keywords
guide tube
guide
cover
rib webs
bush
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
EP94118815A
Other languages
German (de)
French (fr)
Other versions
EP0668037A1 (en
Inventor
Hans Jürgen Bauer
Werner Rösch
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.)
Suspa Compart AG
Original Assignee
Suspa Compart AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suspa Compart AG filed Critical Suspa Compart AG
Publication of EP0668037A1 publication Critical patent/EP0668037A1/en
Application granted granted Critical
Publication of EP0668037B1 publication Critical patent/EP0668037B1/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
    • 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 guide bushing according to the preamble of claim 1 and a length-adjustable column according to the preamble of claim 3.
  • Such guide bushes and length-adjustable columns are known, for example, from EP 0 553 440 A1.
  • To axially fix the guide bushing in the guide tube it rests on the one hand with a collar molded onto an upper cover against the associated edge of the guide tube.
  • an inwardly projecting projection is pressed into the guide tube, which, after the guide sleeve has been inserted into the guide tube, engages behind an annular web running between the rib webs, which is deflected accordingly elastically when the guide sleeve is pressed into the guide tube.
  • the ring web must therefore be designed to be relatively soft and elastic.
  • the invention is therefore based on the object of designing a guide bush of the generic type and a length-adjustable column of the generic type in such a way that they can absorb high extension forces.
  • a guide bush 1 is arranged in a steel guide tube 2 of a height-adjustable chair column.
  • chair columns are known for example from EP 0 366 889 B1 (corresponding to US Pat. No. 4,969,619), to which express reference is made.
  • the guide bushing 1 has a sliding bushing 3, on the outside of which rib webs 5 projecting outwards radially to the central longitudinal axis 4 are formed. With these rib webs 5, the guide bush 1 is supported radially against the inner wall 6 of the guide tube 2. An upper collar 7 places the guide sleeve 1 in the axial direction opposite Guide tube 2 firmly. In addition, the guide bush 1 is pushed into the guide tube 2 with a press fit.
  • a housing 9 of an only indicated gas spring 10 is guided so as to be displaceable in the direction of the axis 4.
  • This gas spring 10 together with the guide tube 2 and the guide bush 1 essentially form the mentioned height-adjustable chair column.
  • the housing 9 of the gas spring 10 can be its direct housing, or an additional support tube surrounding the gas spring 10, as is known from EP 0 325 726 A1 (corresponding to US Pat. No. 4,899,969), to which reference is also expressly made.
  • the guide sleeve 1 is made of plastic, preferably a polyacetal, and is made in one piece by injection molding.
  • Guide webs 11 are formed on the inner surface 8 of the sliding bush 3, which extend over the full axial length of the sliding bush 3 and project radially from the inner surface 8 to the axis 3. They are formed in one piece with the sliding bush 3.
  • the design of the guide webs 11 is known from EP 0 553 440 A1, to which reference is made.
  • openings 13 are formed between the rib webs 5 which, as can be seen in particular from FIG. 4, extend over the inner wall 6 of the guide tube 2 .
  • the rib webs 5 are provided with a circumferential ring web 15 on their outer circumference, ie where they abut against the inner wall 6 of the guide tube 2. This is located a few millimeters below the edge 16 of the guide tube 2, against which the guide sleeve 1 rests with its collar 7.
  • the ring web 15 is in turn connected to the outer wall 18 of the slide bush 3 and the rib webs 5 by means of a stiffening web 17. In the direction of the edge 16 of the guide tube 2 or in the direction of the upper cover 12 of the guide bush 1, the stiffening web 17 merges flush into the ring web 15.
  • the guide bush 1 While the guide bush 1 through the collar 7 opposite the guide tube 2 in the axial direction towards the bottom 19 of the guide tube 2 is fixed, the guide bush 1 must be fixed separately against pulling the guide bush 1 out of the guide tube 2. This is done by cutting out a thin chip from the inner wall 6 of the guide tube 2 from the edge 16 between adjacent ribs 5 of the guide sleeve 1 and pressing it against the facing surface 21 of the ring web 15 and the stiffening web 17. It takes the form of a nose-like projection 20.
  • Fig. 3 the nose-like projections 20 are shown for clarity, although the guide tube is not shown there.

Landscapes

  • Chairs Characterized By Structure (AREA)
  • Tents Or Canopies (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Road Signs Or Road Markings (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)

Description

Die Erfindung betrifft eine Führungsbüchse nach dem Oberbegriff des Anspruches 1 und eine längenverstellbare Säule nach dem Oberbegriff des Anspruches 3.The invention relates to a guide bushing according to the preamble of claim 1 and a length-adjustable column according to the preamble of claim 3.

Derartige Führungsbüchsen und längenverstellbare Säulen sind beispielsweise aus der EP 0 553 440 A1 bekannt. Zur axialen Festlegung der Führungsbüchse im Führungsrohr liegt diese einerseits mit einem an eine obere Abdeckung angeformten Bund gegen den zugeordneten Rand des Führungsrohres an. Andererseits wird benachbart zu dem Rand ein nach innen ragender Vorsprung in das Führungsrohr gedrückt, der nach dem Einschieben der Führungsbüchse in das Führungsrohr hinter einen zwischen den Rippenstegen verlaufenden Ringsteg greift, der beim Eindrücken der Führungsbüchse in das Führungsrohr entsprechend elastisch ausgelenkt wird. Der Ringsteg muß also verhältnismäßig weichelastisch ausgebildet sein. Es treten Fälle auf, in denen die Führungsbüchse verhältnismäßig großen aus dem Führungsrohr heraus gerichteten Kräften ausgesetzt ist, die durch die erwähnte axiale Festlegung nicht aufgenommen werden können.Such guide bushes and length-adjustable columns are known, for example, from EP 0 553 440 A1. To axially fix the guide bushing in the guide tube, it rests on the one hand with a collar molded onto an upper cover against the associated edge of the guide tube. On the other hand, adjacent to the edge, an inwardly projecting projection is pressed into the guide tube, which, after the guide sleeve has been inserted into the guide tube, engages behind an annular web running between the rib webs, which is deflected accordingly elastically when the guide sleeve is pressed into the guide tube. The ring web must therefore be designed to be relatively soft and elastic. There are cases in which the guide bushing is exposed to relatively large forces which are directed out of the guide tube and which cannot be accommodated by the aforementioned axial fixing.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Führungsbüchse der gattungsgemäßen Art und eine längenverstellbare Säule der gattungsgemäßen Art so auszugestalten, daß sie hohe Ausschubkräfte aufnehmen können.The invention is therefore based on the object of designing a guide bush of the generic type and a length-adjustable column of the generic type in such a way that they can absorb high extension forces.

Diese Aufgabe wird bei einer Führungsbüchse der gattungsgemäßen Art durch die Merkmale im Kennzeichnungsteil des Anspruches 1 und bei einer längenverstellbaren Säule nach dem Oberbegriff des Anspruches 3 durch die Merkmale im Kennzeichnungsteil des Anspruches 3 gelöst.This object is achieved in a guide bush of the generic type by the features in the characterizing part of claim 1 and in a length-adjustable column according to the preamble of claim 3 by the features in the characterizing part of claim 3.

Durch die großen den Rand des aus Stahl bestehenden Führungsrohres übergreifenden Öffnungen können Schneid-Stanzwerkzeuge eingeführt werden, die durch eine Bewegung parallel zur Mittel-Längs-Achse des Führungsrohres einen dünnen Span aus der Innenseite des Führungsrohres herausschneiden, der mit diesem verbunden bleibt und eine stegartige Nase bildet. Diese legt sich gegen die zugewandte Oberfläche des Versteifungssteges, der so stabil ausgebildet ist, daß er die hierbei auftretenden Kräfte aufnehmen kann. Umgekehrt ist damit die Verbindung zwischen Führungsbüchse und Führungsrohr so fest, daß die Führungsbüchse auch nicht mittels hoher Ausschubkräfte aus dem Führungsrohr herausgedrückt werden kann. Die Ansprüche 2 und 4 geben eine vorteilhafte Weiterbildung an.Through the large openings overlapping the edge of the steel guide tube, cutting punching tools can be introduced which, by moving parallel to the central longitudinal axis of the guide tube, cut a thin chip out of the inside of the guide tube, which remains connected to it, and a web-like one Nose forms. This lies against the facing surface of the stiffening web, which is so stable that it can absorb the forces that occur. Conversely, the connection between the guide bush and the guide tube is so firm that the guide bush cannot be pushed out of the guide tube by means of high extension forces. Claims 2 and 4 indicate an advantageous further development.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispieles anhand der Zeichnung. Es zeigt

Fig. 1
einen Teilausschnitt aus einer höhenverstellbaren Stuhlsäule mit Führungsrohr, Führungsbüchse und Gehäuse einer Gasfeder,
Fig. 2
die Führungsbüchse im Längsschnitt,
Fig. 3
eine Draufsicht auf Fig. 2 gemäß dem Sichtpfeil III in Fig. 2 und
Fig. 4
eine Ausschnittvergrößerung aus Fig. 1.
Further advantages, features and details of the invention result from the following description of an exemplary embodiment with reference to the drawing. It shows
Fig. 1
a partial section of a height-adjustable chair column with guide tube, guide bush and housing of a gas spring,
Fig. 2
the guide bush in longitudinal section,
Fig. 3
a plan view of Fig. 2 according to the arrow III in Fig. 2 and
Fig. 4
an enlarged detail from FIG. 1.

Eine Führungsbüchse 1 ist in einem Führungsrohr 2 aus Stahl einer höhenverstellbaren Stuhlsäule angeordnet. Derartige Stuhlsäulen sind beispielsweise aus der EP 0 366 889 B1 (entsprechend US-Patent 4 969 619) bekannt, worauf ausdrücklich verwiesen wird.A guide bush 1 is arranged in a steel guide tube 2 of a height-adjustable chair column. Such chair columns are known for example from EP 0 366 889 B1 (corresponding to US Pat. No. 4,969,619), to which express reference is made.

Die Führungsbüchse 1 weist eine Gleitbüchse 3 auf, an deren Außenseite radial zur Mittel-Längs-Achse 4 nach außen vorspingende Rippen-Stege 5 angeformt sind. Mit diesen Rippen-Stegen 5 stützt sich die Führungsbüchse 1 radial gegen die Innenwand 6 des Führungsrohres 2 ab. Ein oberer Ringbund 7 legt die Führungsbüchse 1 in axialer Richtung gegenüber dem Führungsrohr 2 fest. Im übrigen ist die Führungsbüchse 1 mit Preßsitz in das Führungsrohr 2 eingeschoben.The guide bushing 1 has a sliding bushing 3, on the outside of which rib webs 5 projecting outwards radially to the central longitudinal axis 4 are formed. With these rib webs 5, the guide bush 1 is supported radially against the inner wall 6 of the guide tube 2. An upper collar 7 places the guide sleeve 1 in the axial direction opposite Guide tube 2 firmly. In addition, the guide bush 1 is pushed into the guide tube 2 with a press fit.

An der Innenfläche 8 der Gleitbüchse 3 ist ein Gehäuse 9 einer nur angedeuteten Gasfeder 10 in Richtung der Achse 4 verschiebbar geführt. Diese Gasfeder 10 bildet zusammen mit dem Führungsrohr 2 und der Führungsbüchse 1 im wesentlichen die angesprochene höhenverstellbare Stuhlsäule. Das Gehäuse 9 der Gasfeder 10 kann deren unmittelbares Gehäuse sein, oder ein zusätzliches, die Gasfeder 10 umgebendes Tragrohr, wie es aus der EP 0 325 726 A1 (entsprechend der US-PS 4 899 969) bekannt ist, worauf ebenfalls ausdrücklich verwiesen wird.On the inner surface 8 of the sliding bush 3, a housing 9 of an only indicated gas spring 10 is guided so as to be displaceable in the direction of the axis 4. This gas spring 10 together with the guide tube 2 and the guide bush 1 essentially form the mentioned height-adjustable chair column. The housing 9 of the gas spring 10 can be its direct housing, or an additional support tube surrounding the gas spring 10, as is known from EP 0 325 726 A1 (corresponding to US Pat. No. 4,899,969), to which reference is also expressly made.

Die Führungsbüchse 1 besteht aus Kunststoff, und zwar bevorzugt aus einem Polyacetal, und ist einstückig durch Spritzgießen hergestellt. An der Innenfläche 8 der Gleitbüchse 3 sind Führungsstege 11 ausgebildet, die über die volle axiale Länge der Gleitbüchse 3 verlaufen und radial von der Innenfläche 8 zur Achse 3 hin vorstehen. Sie sind einstückig mit der Gleitbüchse 3 ausgebildet. Die Ausgestaltung der Führungsstege 11 ist aus der EP 0 553 440 A1 bekannt, worauf verwiesen wird.The guide sleeve 1 is made of plastic, preferably a polyacetal, and is made in one piece by injection molding. Guide webs 11 are formed on the inner surface 8 of the sliding bush 3, which extend over the full axial length of the sliding bush 3 and project radially from the inner surface 8 to the axis 3. They are formed in one piece with the sliding bush 3. The design of the guide webs 11 is known from EP 0 553 440 A1, to which reference is made.

In der oberen Abdeckung 12 der Führungsbüchse 1, die die Gleitbüchse 3 mit dem Ringbund 7 verbindet, sind jeweils zwischen den Rippenstegen 5 Öffnungen 13 ausgebildet, die sich - wie insbesondere aus Fig. 4 ersichtlich ist - bis über die Innenwand 6 des Führungsrohres 2 erstrecken.In the upper cover 12 of the guide bush 1, which connects the slide bush 3 to the annular collar 7, 5 openings 13 are formed between the rib webs 5 which, as can be seen in particular from FIG. 4, extend over the inner wall 6 of the guide tube 2 .

Die Rippenstege 5 sind an ihrem Außenumfang, also dort, wo sie gegen die Innenwand 6 des Führungsrohres 2 anliegen, mit einem umlaufenden Ringsteg 15 versehen. Dieser befindet sich wenige Millimeter unterhalb des Randes 16 des Führungsrohres 2, gegen den die Führungsbüchse 1 mit ihrem Ringbund 7 anliegt. Der Ringsteg 15 ist wiederum mittels eines Versteifungsstegs 17 mit der Außenwand 18 der Gleitbüchse 3 und den Rippenstegen 5 verbunden. In Richtung zum Rand 16 des Führungsrohres 2 hin bzw. in Richtung zur oberen Abdeckung 12 der Führungsbüchse 1 hin geht der Versteifungssteg 17 bündig in den Ringsteg 15 über.The rib webs 5 are provided with a circumferential ring web 15 on their outer circumference, ie where they abut against the inner wall 6 of the guide tube 2. This is located a few millimeters below the edge 16 of the guide tube 2, against which the guide sleeve 1 rests with its collar 7. The ring web 15 is in turn connected to the outer wall 18 of the slide bush 3 and the rib webs 5 by means of a stiffening web 17. In the direction of the edge 16 of the guide tube 2 or in the direction of the upper cover 12 of the guide bush 1, the stiffening web 17 merges flush into the ring web 15.

Während die Führungsbüchse 1 durch den Ringbund 7 gegenüber dem Führungsrohr 2 in axialer Richtung zum Boden 19 des Führungsrohres 2 hin festgelegt ist, muß eine gesonderte Festlegung der Führungsbüchse 1 gegen ein Herausziehen der Führungsbüchse 1 aus dem Führungsrohr 2 erfolgen. Dies erfolgt dadurch, daß aus der Innenwand 6 des Führungsrohres 2 vom Rand 16 her zwischen benachbarten Rippenstegen 5 der Führungsbüchse 1 jeweils ein dünner Span herausgeschnitten und gegen die zugewandte Oberfläche 21 des Ringstegs 15 und des Versteifungsstegs 17 gedrückt wird. Es erhält die Form eines nasenartigen Vorsprungs 20. Dies erfolgt dadurch, daß jeweils ein entsprechendes Werkzeug durch einen Teil der Öffnungen 13 oder sämtliche Öffnungen 13 hindurchgeschoben wird, das jeweils einen Span mit einer Dicke von wenigen Zehntel Millimetern aus der Innenwand 6 des Führungsrohres 2 hinausschneidet und gegen die Oberfläche 21 des Ringstegs 15 und des Versteifungsstegs 17 schiebt. Damit ist die Führungsbüchse 1 im Führungsrohr 2 auch gegen große Ausziehkräfte gesichert.While the guide bush 1 through the collar 7 opposite the guide tube 2 in the axial direction towards the bottom 19 of the guide tube 2 is fixed, the guide bush 1 must be fixed separately against pulling the guide bush 1 out of the guide tube 2. This is done by cutting out a thin chip from the inner wall 6 of the guide tube 2 from the edge 16 between adjacent ribs 5 of the guide sleeve 1 and pressing it against the facing surface 21 of the ring web 15 and the stiffening web 17. It takes the form of a nose-like projection 20. This is done by pushing a corresponding tool through part of the openings 13 or all of the openings 13, each of which cuts a chip with a thickness of a few tenths of a millimeter out of the inner wall 6 of the guide tube 2 and pushes against the surface 21 of the ring web 15 and the stiffening web 17. The guide bush 1 in the guide tube 2 is thus also secured against large pull-out forces.

In Fig. 3 sind zur Verdeutlichung die nasenartigen Vorsprünge 20 dargestellt, obwohl das Führungsrohr dort nicht dargestellt ist.In Fig. 3 the nose-like projections 20 are shown for clarity, although the guide tube is not shown there.

Claims (4)

  1. Guide bush for an adjustable-length column for chairs, tables or the like, which is provided on its interior surface (8) with a guide surface concentric of a central longitudinal axis (4) for the guidance of a cylindrical housing (9) of an adjusting element, for example a gas spring (10), and the outside of which is provided with rib webs (5) arranged at a distance from each other for the accommodation and support in a guide tube (2) of the column, and which comprises a cover (12) for bearing against an edge (16) of the guide tube (2), and openings (13) located between the rib webs (5) in the cover (12), and which is formed in one piece out of plastics, characterized in that the openings (13) in the cover (12) project as far as over the edge (16) of a guide tube (2), accommodating the guide bush (1), and are dimensioned for the passage of a tool, and in that adjacent to the cover (12), a stiffening web (17) is provided, connecting the rib webs (5) with each other, for nose-type projections (20) to bear against, which are cut between the rib webs (5) out of the inner wall (6) of the guide tube (2).
  2. Guide bush according to claim 1, characterized in that in one piece with the stiffening web (17), an annular web (15) is formed, which connects the rib webs (5) and bears against the inside (14) of the guide tube (2) and, together with the stiffening web (17), forms a flush surface (21) facing the cover (12) as a bearing face for the nose-type projections (20).
  3. Adjustable-length column for chairs, tables or the like with a guide tube (2) and a guide bush (1), which is provided on its interior surface (8) with a guide surface concentric of a central longitudinal axis (4) for the guidance of a cylindrical housing (9) of an adjusting element, for example a gas spring (10), and the outside of which is provided with rib webs (5) arranged at a distance from each other for the accommodation and support in the guide tube (2), and which comprises a cover (12) for bearing against an edge (16) of the guide tube (2), and openings (13) located between the rib webs (5) in the cover (12), and which is formed in one piece out of plastics, characterized in that the openings (13) in the cover (12) project as far as over the edge (16) of the guide tube (2), and are dimensioned for the passage of a tool, and in that adjacent to the cover (12), a stiffening web (17) is provided, connecting the rib webs (5) with each other, for nose-type projections (20) to bear against, which are cut between the rib webs (5) out of the inner wall (6) of the guide tube (2).
  4. Adjustable-length column according to claim 3, characterized in that in one piece with the stiffening web (17), an annular web (15) is formed, which connects the rib webs (5) and bears against the inside (14) of the guide tube (2) and, together with the stiffening web (17), forms a flush surface (21) facing the cover (12) as a bearing face for the nose-type projections (20).
EP94118815A 1994-02-18 1994-11-30 Guiding sleeve and telescopic column with guiding sleeve Expired - Lifetime EP0668037B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9402656U 1994-02-18
DE9402656U DE9402656U1 (en) 1994-02-18 1994-02-18 Guide sleeve and adjustable column with guide sleeve

Publications (2)

Publication Number Publication Date
EP0668037A1 EP0668037A1 (en) 1995-08-23
EP0668037B1 true EP0668037B1 (en) 1997-03-05

Family

ID=6904747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94118815A Expired - Lifetime EP0668037B1 (en) 1994-02-18 1994-11-30 Guiding sleeve and telescopic column with guiding sleeve

Country Status (3)

Country Link
EP (1) EP0668037B1 (en)
DE (2) DE9402656U1 (en)
ES (1) ES2098853T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420914A1 (en) * 1994-06-16 1995-12-21 Suspa Compart Ag Length-adjustable gas spring and length-adjustable column for chairs, tables with a length-adjustable gas spring

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8800976U1 (en) * 1988-01-28 1989-06-01 Fritz Bauer + Söhne oHG, 8503 Altdorf Lockable lifting device for stepless adjustment of furniture parts and guide bush for such a lifting device
DE9200884U1 (en) * 1992-01-25 1992-04-09 Suspa Compart AG, 8503 Altdorf Guide bushing for a length-adjustable column for chairs, tables or similar.
DE4242475A1 (en) * 1992-12-16 1994-06-23 Suspa Compart Ag Guide bushing, in particular for length-adjustable chair column and chair column with such a guide bushing

Also Published As

Publication number Publication date
EP0668037A1 (en) 1995-08-23
DE59401944D1 (en) 1997-04-10
ES2098853T3 (en) 1997-05-01
DE9402656U1 (en) 1994-04-14

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