EP0521762B1 - Säule für eine Möbelstütze, die mit einer Gasfeder ausgestattet ist - Google Patents

Säule für eine Möbelstütze, die mit einer Gasfeder ausgestattet ist Download PDF

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Publication number
EP0521762B1
EP0521762B1 EP92401836A EP92401836A EP0521762B1 EP 0521762 B1 EP0521762 B1 EP 0521762B1 EP 92401836 A EP92401836 A EP 92401836A EP 92401836 A EP92401836 A EP 92401836A EP 0521762 B1 EP0521762 B1 EP 0521762B1
Authority
EP
European Patent Office
Prior art keywords
gas spring
pillar
tube
sleeve
stop means
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
EP92401836A
Other languages
English (en)
French (fr)
Other versions
EP0521762A1 (de
Inventor
Dominique Dony
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.)
Airax SA
Original Assignee
Airax SA
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 Airax SA filed Critical Airax SA
Publication of EP0521762A1 publication Critical patent/EP0521762A1/de
Application granted granted Critical
Publication of EP0521762B1 publication Critical patent/EP0521762B1/de
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 present invention relates to a column intended to be part of a furniture support or another piece of furniture equipped with a gas spring.
  • Seating with gas springs has been known for a long time and consists of the following parts: one foot resting on the ground, an upper part, which constitutes the seat in the case of a seat, a central shaft, essentially vertical, called “column”, telescopic and of adjustable height, interposed between the base and the upper part,
  • the position indications such as “vertical”, “upper” and others relate in the present text to the situation which arises when the seat or other piece of furniture is in the position of use.
  • the gas spring compensates for the weight of the upper part and is used to adjust the length of the column, and therefore to maintain the height chosen for the upper part.
  • Its body is placed, with lateral play, in the sliding tube and its rod is fixed by its end opposite to the piston, on the bottom of the support tube.
  • the body carries, at its end opposite to the rod, a locking control finger, movable axially.
  • the seat cushion is fitted with an articulated device enabling the control finger to be actuated.
  • the column inside which the gas spring has been placed, constitutes an assembly which is delivered as is to the furniture manufacturer, who must simply fix it on the base and on the seat.
  • the foot and the seat each have a part in the shape of a hollow cone, and the ends of the column, that is to say those of the support tube and of the sliding tube, have a corresponding suitable conical shape, for a press fit.
  • the upper stop means is a frustoconical piece of less rigid material than that of the sliding tube.
  • the object of the present invention is to provide a column for seats which has an improved service life, without appreciable increase in the weight and the cost price of this column.
  • the upper stop means mentioned above is constituted by a rigid metallic sleeve, fixed by hard fitting in the upper part of the sliding tube and extending at least over the entire frustoconical end part. of it.
  • a sleeve which also serves as a stop means for the gas spring. It is therefore not necessary to provide an additional part, it was sufficient to change the shape and the material of the stop means.
  • the thickness of the sleeve is not sufficient for it to serve as a stop means, it can be provided that it is folded inwards at its lower part to form one or more roughly radial surfaces, against which s supports the upper face of the gas spring body.
  • the sleeve can be made from a section of cylindrical tube, which is given a frustoconical shape suitable for the press. According to a preferred embodiment, the sleeve is formed from a split sleeve. The shaping is then easier, and one is assured of a uniform contact between the sleeve and the inner surface of the cone.
  • the invention makes it possible to provide an advantageous solution to a problem to which the prior art provides only costly and complicated solutions, namely the problem of adjustment of the length of the actuating button of the gas spring control finger.
  • the pusher prefferably comprises a lower part into which an upper part is screwed axially which can be turned by hand or with a tool, while a pin which passes through a vertical slot immobilizes in rotation the lower part, without preventing axial movements.
  • the pusher is of non-circular section, and slides in a hole of corresponding shape in the upper stop means. This is prevented from turning in the sliding tube by tightening between the upper end of the gas spring body and the conical inner surface of the sliding tube. This makes it necessary to produce parts of complicated shape, independently of other drawbacks which will be explained below.
  • the sleeve internally has reliefs which cooperate with corresponding reliefs of the pusher to prevent rotation of the latter around the vertical axis. This avoids weakening the end region of the sliding tube through a slit.
  • the internal reliefs are prepared before, during, or after the conical shaping. If the sleeve is produced from a split sleeve, the internal reliefs are produced even more easily, by folding preceded or not by the formation of slots limiting the folded parts.
  • a sleeve formed by a split socket makes it possible to easily produce one or more internal projections at any location of this socket, and in particular on the lips of the slot, to constitute the reliefs preventing rotation of the pusher.
  • the pusher carries elastic tabs of shape and dimensions calculated so that it can be passed at will through the opening of the narrow part of the sleeve, but only an undesired departure, under the effect of a shock, for example, is practically impossible.
  • the manufacturer of the column can install the pusher, or replace it with another at the request of the customer, before shipping to the place of assembly, without risk of seeing the pusher escape during transport.
  • the conical shape of the inside of the sleeve means that, during use, the tongues slide with gentle friction and do not force not to exaggerated efforts to activate the control finger.
  • the body of the gas spring is held in place by two stop means, upper and lower, and, in certain embodiments, it is pressed against the upper stop means to prevent it ci to turn on itself when adjusting the length of the pusher.
  • This tightening is obtained using the lower stop means, often designed as a screw.
  • Such a construction subjects the body of the gas spring to a permanent axial stress, and causes the stresses applied to the sliding tube by the upper part of the cabinet, in particular the seat, to be transmitted to it. This can affect the longevity of the assembly and is not desirable.
  • the upper stop means is made of a less rigid material than the steel which forms the sliding tube and the body of the gas spring, for example in "Zamak" alloy, but the resulting improvement is necessarily limited, since a significant axial stress is always necessary, and an insufficiently rigid material would adversely affect the precision of the length adjustment of the pusher.
  • the invention results in that an axial tightening of the gas spring is not necessary, because the sleeve, which serves as an upper stop means, cannot rotate, because it is force fitted.
  • a deformable element is interposed between the lower stop means and the body of the gas spring.
  • the lower stop means is constituted by a threaded part cooperating with a thread of the sliding tube, stop means provided at the lower end of said tube limiting its movement, and the deformable element is constituted by a flexible collar, in one piece with the stop means, and which protrudes into the sliding tube to bear on the body of the gas spring.
  • Reference 1 designates the column, which will be described in detail below.
  • This column of generally cylindrical shape with a converging frustoconical upper end, slides with gentle friction in a support tube 2, integral with a foot 3, which is only shown in part.
  • the connection between the foot 3 and the support tube 2 is obtained by the fact that the lower end of this tube is conical and is force-fitted into a conical bore, of corresponding shape of the foot.
  • the invention also applies in the case of another mode of connection, for example by welding.
  • the support tube 2 is provided, internally, towards its upper end, with a bush 4 of plastic material with low coefficient of friction, to facilitate the sliding of the column.
  • the frustoconical end of the column 1 is force-fitted into a frustoconical recess of a support piece 5, integral with the seat of the seat, which is not shown.
  • Column 1 comprises a cylindrical-frustoconical sliding tube 6, made of metal, inside which is housed the body 7 of a gas spring.
  • a game 8 which by standards current is about 1.5% of the diameter of the body 7, exists between the tube 6 and the body 7.
  • the piston rod 9 of the gas spring is directed downward. It is fixed to the bottom 10 of the support tube 2, with the insertion of a ball bearing 11, in a known manner.
  • the bottom 10 consists of a bowl with a conical edge, of a shape adapted to be force fitted inside the conical lower end of the support tube 2. It is clear that other shapes and fixing methods, in particular by welding, are possible.
  • a reinforcing sleeve 12 made of steel, is mounted with hard friction inside the tube 6, and extends to its upper end, while the lower end of the sleeve 12 extends down slightly. beyond the frustoconical part 13 of the tube 6.
  • the thickness of the sleeve 12 is several times greater than the dimension of the clearance 8 between the body 7 of the gas spring and the tube 6, so that this body comes to bear over the entire length of the lower edge 14 of the sleeve 12, and does not risk taking an oblique position. If it is desired to be able to equip the column with a gas spring of smaller diameter, it is possible to provide tongues 15, shown in dashed lines in the figure, folded inwards and intended to serve as a bearing surface for the gas spring.
  • a control finger 16 movable vertically, projects at the upper end of the body 7 of the gas spring. In known manner, it serves to immobilize the piston rod 9 in a desired position, in order to fix the height of the seat above the ground.
  • the depression of the finger 16 controls the release, and therefore allows this height to be changed.
  • the control finger 16 is controlled by the user using a lever 17 mounted by a hinge 18 on the support piece.
  • This pusher 19 is a plastic part having a certain flexibility. Its lower end 20 is of concave shape, and comes to bear on the convex end of finger 16.
  • the pusher 19 has an axial blind hole 21, in which a self-tapping screw 22 is inserted, the head of which can come into contact with the lever 17. It will be appreciated that the more or less the screw 22 in the pusher 19 makes it possible to vary the length of the assembly, which is close to that of the sleeve 12, so that at rest, the lever 17 does not exert constant pressure on the control finger 16, but that it can, however, be easily actuated by the user, in order to cause the release of the gas spring.
  • a stop integral with the support piece limits the movement of the lever 17 in the direction opposite to the gas spring, and therefore fixes the maximum length that the assembly formed by the pusher 19 and the screw 22 can have.
  • a tongue 23, in one piece with the sleeve, is folded inward, and enters a longitudinal groove 24 of the pusher 19.
  • the cooperation of the folded tongue 23 and the groove 24 prevents rotation of the pusher 19 around the vertical axis, while allowing it to slide parallel to this axis.
  • the pusher itself is immobilized in rotation, in a simple manner, and without additional part, by socket 12.
  • the folded tongue 23 extends over the entire length of one of the lips of the slot 25 of the sleeve.
  • Figure 2 shows that the pusher 19 further carries deformable tongues 27, which bear on the inner surface of the sleeve 12. These tabs hold this pusher inside the sleeve during transport which precedes the assembly and the assembly itself, while allowing the movement with gentle friction of the pusher 19 inside the sleeve 12 This results from the fact that the internal conicity of the sleeve 12 means that the friction increases if the pusher 19 is pushed or pulled towards the outside of the tube 6.
  • the lower end of the tube 6 is internally threaded, and is provided with a screw cap 30, which has an axial hole 31 for the passage of the piston rod 9 of the gas spring, and which carries, at its upper part, that is to say that which is inside the tube 6, a deformable flange 32, against which the lower end of the body 7 of the gas spring bears continuously in a flexible manner, which keeps it all by absorbing the possible shocks and stresses that this body could undergo.
  • the plug 30 has a shoulder 33, which abuts against the lower edge of the tube 6, so as to prevent excessive tightening of the plug, which would reduce the effect of the flexible flange 32.

Landscapes

  • Chairs Characterized By Structure (AREA)
  • Fluid-Damping Devices (AREA)
  • Display Racks (AREA)

Claims (9)

  1. Säule, die einen Teil eines Möbelstücks bilden kann und zwischen einem Fuß (3) und einem oberen Teil (5) des Möbelstücks angeordnet sein kann, mit
       einem Lagerrohr (2), das einstückig mit dem Fuß (3) ausgebildet sein kann, einem verschiebbaren Rohr (6), dessen oberes Ende (13) in einen Hohlraum einer dem oberen Teil entsprechenden Form eingepreßt sein kann, und einer Gasfeder, deren Gehäuse (7) mit seitlichem Spiel im verschiebbaren Rohr angeordnet ist und deren dem Kolben gegenüberliegendes Kolbenstangenende (9) am Boden des Lagerrohrs (2) fixiert ist, wobei die Gasfeder an ihrem der Kolbenstange gegenüberliegenden Ende einen Steuerzapfen (16) für eine Blockierung aufweist,
       wobei die Säule mit einer oberen Arretierungseinrichtung versehen ist, die im oberen Teil des verschiebbaren Rohres angeordnet ist und dazu dient, die Verschiebungen des Gehäuses (7) der Gasfeder nach oben zu begrenzen, wobei diese obere Arretierungseinrichtung von einem Vertikalkanal durchlaufen wird, in dem sich eine Druckvorrichtung (19) verschieben kann, die dazu dient, auf den Steuerzapfen (16) einzuwirken,
       und einer unteren Arretierungseinrichtung (30, 32), die am unteren Teil des verschiebbaren Rohres angeordnet ist und die Verschiebungen des Gehäuses (7) der Gasfeder nach unten begrenzen kann, wobei diese untere Arretierungseinrichtung von einem Vertikalkanal (31) durchlaufen wird, in dem sich die Kolbenstange (9) der Gasfeder verschieben kann,
       dadurch gekennzeichnet, daß die obere Arretierungseinrichtung durch eine starre metallische Hülse (12) gebildet ist, die in den oberen Teil des verschiebbaren Rohres (6) eingepreßt ist und sich mindestens über den gesamten konischen Endteil (13) des oberen Teils des verschiebbaren Rohres (6) erstreckt, um eine Verstärkung des Rohres vorzusehen.
  2. Säule nach Anspruch 1, dadurch gekennzeichnet, daß die Hülse (12) an ihrem unteren Teil nach innen umgebogen ist, um eine oder mehrere nahezu radiale Flächen (15) zu bilden, gegen die sich die Oberseite des Gehäuses der Gasfeder abstützt.
  3. Säule nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Hülse im wesentlichen aus einem Anschnitt eines zylindrischen Rohres besteht, der in eine kegelstumpfartige Form gepreßt worden ist.
  4. Säule nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Hülse im wesentlichen aus einem geschlitzten Ring besteht.
  5. Säule nach einem der Ansprüche 1 bis 4, bei der die Druckvorrichtung (19) an ihrem oberen Teil ein Axialloch aufweist, in dem eine Längenregelschraube (22) montiert ist, und bei der Einrichtungen vorgesehen sind, die die Druckvorrichtung (19) während des Regelns drehfest lagern, ohne deren Axialverschiebungen zu verhindern, dadurch gekennzeichnet, daß zur Ausbildung der Einrichtungen zur drehfesten Lagerung die Hülse im Inneren Erhöhungen (23) aufweist, die mit entsprechenden Erhöhungen (24) der Druckvorrichtung zusammenwirken.
  6. Säule nach den Ansprüchen 4 und 5, dadurch gekennzeichnet, daß die inneren Erhöhungen der Hülse durch mindestens einen Teil (23) von mindestens einer nach innen umgebogenen Schlitzlippe gebildet sind.
  7. Säule nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Druckvorrichtung elastische Laschen (27) trägt, die mit sanfter Reibung mindestens auf der Innenfläche des engsten Teiles der Hülse gleiten.
  8. Säule nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß ein verformbares Element (32) benachbart zur unteren Arretierungseinrichtung vorgesehen ist und sich am Gehäuse (7) der Gasfeder abstützt.
  9. Säule nach Anspruch 8, dadurch gekennzeichnet, daß die untere Arretierungseinrichtung durch ein mit einem Gewinde versehenes Teil (30) gebildet ist, das mit einem Gewinde des verschiebbaren Rohres (6) zusammenwirkt, daß ein Anschlag, der am unteren Ende des Rohres vorgesehen ist, dessen Verschiebung begrenzt und daß die untere Arretierungseinrichtung nach oben durch einen flexiblen Bund (32) verlängert ist, der in das Innere des verschiebbaren Rohres (6) vorsteht und das verformbare Element bildet.
EP92401836A 1991-07-01 1992-06-29 Säule für eine Möbelstütze, die mit einer Gasfeder ausgestattet ist Expired - Lifetime EP0521762B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9108156 1991-07-01
FR9108156A FR2678495B1 (fr) 1991-07-01 1991-07-01 Colonne destinee a faire partie d'un support de meuble equipe d'un ressort a gaz.

Publications (2)

Publication Number Publication Date
EP0521762A1 EP0521762A1 (de) 1993-01-07
EP0521762B1 true EP0521762B1 (de) 1995-04-19

Family

ID=9414529

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401836A Expired - Lifetime EP0521762B1 (de) 1991-07-01 1992-06-29 Säule für eine Möbelstütze, die mit einer Gasfeder ausgestattet ist

Country Status (7)

Country Link
US (1) US5284312A (de)
EP (1) EP0521762B1 (de)
AT (1) ATE121278T1 (de)
CA (1) CA2072305C (de)
DE (1) DE69202112T2 (de)
ES (1) ES2073887T3 (de)
FR (1) FR2678495B1 (de)

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DE19628721C2 (de) * 1996-07-17 1999-01-21 Stabilus Gmbh Höhenverstellbare Säule
JP3923126B2 (ja) * 1997-03-17 2007-05-30 スーガン株式会社 医療器具用スタンド
EP0914570A1 (de) * 1997-05-21 1999-05-12 Cabex AG Einrichtung zur verstellung der länge einer stütze sowie ein verfahren zur herstellung derselben
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GB2412306A (en) * 2004-03-23 2005-09-28 Sunpex Technology Co Ltd Motorised wheelchair with seat height adjustment.
US20060082203A1 (en) * 2004-10-20 2006-04-20 Gasser Chair Company, Inc. Adjustable gaming stool with releasable locking assembly
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Also Published As

Publication number Publication date
DE69202112T2 (de) 1995-12-14
CA2072305A1 (en) 1993-01-02
US5284312A (en) 1994-02-08
DE69202112D1 (de) 1995-05-24
EP0521762A1 (de) 1993-01-07
FR2678495B1 (fr) 1993-09-24
ATE121278T1 (de) 1995-05-15
FR2678495A1 (fr) 1993-01-08
ES2073887T3 (es) 1995-08-16
CA2072305C (en) 2001-10-30

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