EP0578276A1 - Einrichtung zur Beeinflussung der Führung eines Bürostuhls oder dergleichen - Google Patents

Einrichtung zur Beeinflussung der Führung eines Bürostuhls oder dergleichen Download PDF

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Publication number
EP0578276A1
EP0578276A1 EP93113055A EP93113055A EP0578276A1 EP 0578276 A1 EP0578276 A1 EP 0578276A1 EP 93113055 A EP93113055 A EP 93113055A EP 93113055 A EP93113055 A EP 93113055A EP 0578276 A1 EP0578276 A1 EP 0578276A1
Authority
EP
European Patent Office
Prior art keywords
valve
seat part
chair
support frame
bellows
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.)
Withdrawn
Application number
EP93113055A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hans Prof. Roericht
Horst Prof. Fleischmann
Franz Dipl.-Ing. Biggel
Burkhard Prof. Schmitz
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.)
Wilkhahn Wilkening and Hahne GmbH and Co KG
Original Assignee
Wilkhahn Wilkening and Hahne GmbH and Co KG
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 Wilkhahn Wilkening and Hahne GmbH and Co KG filed Critical Wilkhahn Wilkening and Hahne GmbH and Co KG
Priority to EP93113055A priority Critical patent/EP0578276A1/de
Publication of EP0578276A1 publication Critical patent/EP0578276A1/de
Withdrawn legal-status Critical Current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
    • A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
    • A47C31/12—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons
    • A47C31/126—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons for 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
    • A47C1/03255—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
    • A47C1/03261—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 relates to a device for influencing the guidance of an office chair or the like.
  • the term synchronous mechanism means the establishment of a combined or dependent back adjustment and seat adjustment, i. H. the adjustment of the back inclination basically also results in an adjustment of the seat.
  • a particular problem with known office chairs is that they generally have to be adjusted to the weight or size of the user.
  • a big and heavy user exerts a much greater force on the back part than a lighter and smaller user.
  • the invention has for its object to propose a chair mechanism as a synchronous mechanism that is extremely simple and effective and is equipped with a comfortable adjustment mechanism that enables damped movements and locks in any position.
  • the invention accordingly provides that damping of the movement of the chair and locking in certain sitting positions can be achieved.
  • a lifting cylinder which can be acted on from both sides or a correspondingly acting bellows is provided, which is clamped between the stationary support frame and the seat part.
  • the adjustment movement of the seat part and the back part can be influenced by the guidance of the fluid between the front and the rear part of the lifting cylinder or the bellows. By throttling or blocking the fluid flow, different seating parameters can be set.
  • a bearing block 26 for a double-acting bellows 27 is fastened to a stationary support frame 2.
  • the bellows consists of a front chamber 28 and a rear chamber 29 which are separated from one another by a partition 30.
  • the middle partition 30 forms at the same time the cylindrical counter bearing for the bearing block 26.
  • the two ends of the bellows chambers 28, 29 are enclosed by a bracket 38 and thus rigidly connected.
  • the bracket 38 in turn is firmly connected to the seat part 5 and performs its movements. A kinematic reversal is possible.
  • the interiors 28, 29 of the bellows 27 are coated with a fluid, for. B. a hydraulic oil or water filled.
  • the two chambers 28, 29 are connected to one another via two separately guided ring lines 31, 32.
  • the ring line 32 represents a return circuit when the chair is not owned and the ring line 31 represents an adjustment circuit and a damping and locking circuit when the chair is owned.
  • a directional control valve 33 regulates the fluid flow between the chambers 28, 29 depending on different positions.
  • a check valve 34 in the ring line 32 and a throttle 35 with a check valve 36 and a locking valve 37 in the ring line 31 serve to influence the fluid in different seating positions.
  • the end regions of the chambers 28, 29 are firmly connected to the seat part 5 via the clamp 38.
  • An additional return spring 39 is designed as a tension spring and brings the office chair back to its starting position, as shown in FIG. 1.
  • FIG. 1 The operating mechanism of FIG. 1 is described as follows in accordance with the basic illustration in FIG. 2:
  • the multi-way valve 33 actuated and moved down from the position shown in FIG. 2.
  • the upper chamber 40 of the valve 33 enters the circuit 32 and closes it, so that no more fluid can flow through (interruption 43), while the middle chamber 41 enters the circuit 31 and opens it (arrow 44).
  • the lower chamber 42 of the valve 33 disengages.
  • the seat part 5 moves forward.
  • the bellows 27 also moves forward via the clamp 38, ie to the right in FIG. 2. Due to the fixed mounting of the middle part 30 of the bellows 27 on the bearing block 26, the fluid must flow from the chamber 29 via the line 31 into the chamber 28 (arrow 46).
  • the seat back adjustment can be locked in any position by actuating the locking valve 37.
  • the circuit in the ring line 31 is interrupted and a rigid connection between the bearing block 26 and the seat part 5 via the bellows 27 is created.
  • valve 33 returns to the position shown in FIG. 2.
  • the fluid can only flow through the chamber 41 and thus through the upper ring line 32, while the lower ring line 31 is blocked.
  • the upper ring line 32 is used to reset the backrest, which may be inclined backwards. In this case, the fluid must flow from the front chamber 28 via line 32 and via the check valve 34 to the rear chamber 29 (arrow 48).
  • the return spring 39 supports this process. If the backrest 7 is in the normal position, the line 32 is also blocked by the check valve 34. A backrest adjustment is only possible by actuating valve 33.
  • FIG. 3 shows an alternative exemplary embodiment for a valve arrangement according to the exemplary embodiment according to FIGS. 1 and 2. This applies in particular to the arrangement of the multi-way valve 33 in FIG. 2.
  • the directional control valve 33 ' is located in the space between the front chamber 28 and the rear chamber 29, i. H. the valve 33 'itself forms the partition 30' of the double-acting bellows.
  • the fluid is passed from one chamber to the other chamber directly through the directional control valve 33 '.
  • the directional control valve 33 ' has a valve housing 49 to which the two chambers 28, 29 of the double-sided are located on the left and right Connect the acting bellows 27 '.
  • the two ends 50, 51 of the bellows 27 ' are fixed in a kinematic reversal to the exemplary embodiment according to FIG. 2 with the support frame 2, while the valve housing 49 is connected to the seat part 5 and can thus be moved back and forth. This connection is shown symbolically in Fig. 3a.
  • the directional control valve 33 has a vertically adjustable actuating tappet 52 which can be displaced vertically between an upper position 53 and a lower position 54. This adjustment takes place simultaneously with the chair load by the user, ie in the upper position 53 the chair is not loaded, in the lower position 54 the chair is loaded.
  • Fig. 3a the lower, ie the possessed chair position is shown.
  • the tappet 52 extends in its lower region into a horizontal through-bore 55 which connects the two chambers 28, 29 and which can be closed by check valves 56 and 57.
  • the check valves 56, 57 are each permeable from the through bore 55 to the chambers 28, 29 and designed to block in the opposite direction. This is symbolically shown again above FIG. 3a.
  • the check valves 56, 57 have on their plate surface centrally in the through bore 55 to the actuating plunger 52 actuating pins 58, 59 which interact with the predetermined curve shape on the plunger cylinder of the actuating plunger 52.
  • various curves of the ram cylinder surface can be actuated.
  • the left actuating pin 58 of the check valve 57 to the chamber 29 abuts the outer surface of the actuating plunger 52, so that the check valve is open in this position.
  • fluid can reach the chamber 28 via the annular gap 62 from the chamber 29 via the through bore 55 and via the check valve 56.
  • the check valve 56 opens independently against the pressure of the pressure spring 63.
  • a corresponding pressure spring 64 has the check valve 57.
  • the fluid is to flow from the chamber 29 into the chamber 28 and vice versa when the inclination of the back part is adjusted.
  • the two actuating pins 58, 59 rest on the outer circumferential surface of the actuating plunger 52, so that both check valves 56, 57 are pressed radially outward and are thus opened (in contrast, the right-hand check valve 56 is shown closed in FIG. 3a).
  • the valve seat of the check valve 57 has an additional annular shoulder 65 in the area of the annular gap 62, which increases the flow resistance for the fluid through this annular gap. The result of this is that the backrest is guided in a more cushioned manner when it is reset to the front than when it is adjusted to the rear.
  • the valve seat therefore acts similarly to the throttle 35 in FIG. 2.
  • the actuating plunger 52 slips from the lower position 54 into the upper position 53.
  • the actuating pins 58 slide, 59 in further recesses 67 in the lower region of the actuating plunger 52, as a result of which the valves are closed.
  • a bypass bore 68 is opened through the lower plunger pin 69, so that fluid can get from the left chamber 29 into the through bore 55 and from there via the check valve 56 into the right chamber 28.
  • This bypass bore 68 with the described fluid passage corresponds to the ring line 32 in FIG. 2.
  • FIG. 3b shows the end view of the directional valve according to FIG. 3a. Identical parts are identified by the same reference symbols.
  • the check valve 56 is attached with a pressure spring 63 via a connecting web 70 to the valve housing 49.
  • the valve housing 49 additionally has two safety valves 71, 72 which close through bores 73, 74 between the chambers 28, 29.
  • the valve plates 75, 76 are pressed against the valve seat by leaf springs 77.
  • These additional safety valves serve to protect the bellows 27 or 27 'in the event that the inclination of the backrest is actuated very abruptly and excessively powerfully and flow compensation in the case of an unoccupied chair via the directional control valve 33 or 33' cannot take place.
  • 3c shows the safety valves 71, 72 arranged one above the other in longitudinal section.
  • the longitudinal plungers 78, 79 serve simultaneously as a one-sided holder with recesses 80 for the leaf springs 77.
  • 3b shows a V-shaped locking bracket 81 for the 90 ° adjustment movement of the adjusting wheel 60 in order to achieve the respective position for locking or releasing the locking of the backrest adjustment.
  • FIGS. 1 to 3 can be implemented on a chair mechanism as shown in FIGS. 4 to 7 and explained in more detail below.
  • the office chair 1 shown in FIG. 4 consists of a stationary support frame 2 with a chair column 3 and a seat part 5 connected to it in the front chair area 4 and a back part 7 articulated in the rear chair area 6.
  • the seat part 5 is connected to the support frame via a pendulum lever 8 2 articulated.
  • the back part 7 is rotatably connected to the support frame 2 in the fixed articulation point A.
  • the articulated connection between the seat part 5 and the back part 7 takes place at the articulation point B.
  • the fixed articulation of the pendulum lever 8 on the support frame 2 takes place at point C.
  • the articulated connection between the pendulum lever 8 and the seat part 5 takes place at point D (lever arm "c" ).
  • the articulation points A, B, C, D form the basis for the 4-point synchronous adjustment of the office chair.
  • point B (arrow 12) also causes the seat part 5 to move to the right in the direction of arrow 13 in the figure. Due to the articulation of the seat part 5 in the fixed point C on the pendulum lever 8, the point D performs an upward circular movement 14 with the lever arm “c” according to arrow 14. As shown in dash-dotted lines in FIGS. 4 and 5, the seat part 5 thereby lifts into the position 5 '. The length of the lever arm of the pendulum lever 8 is indicated by "c".
  • the body weight 15 of the user is shown in FIGS. 4 and 5.
  • This body weight 15 can 4 are broken down into a parallelogram of forces with the forces 15 'and 15'', the force 15' being projected into point B (same angle ⁇ 1), and being perpendicular to the connecting line 10-B.
  • the force 15 'thus generates a counter torque 11', which results from the amount of the force 15 'times the lever arm b.
  • the torque 11 which is set by the back force 9 is counteracted by a counter-torque 11 'which is set by the weight 15.
  • a counter-torque 11 ' which is set by the weight 15.
  • connection points BC-D '' lie on a line (19 '') and therefore point B cannot turn further about point A.
  • This stretched position is therefore the limit position of the chair, which sets itself due to the leverage.
  • the user can support the reset effect by making a slight impression in the front seating area. This applies in particular in the rear backrest position 7 ′′ with a large lever arm e ′′ (see FIGS. 4 and 5).
  • the rearward-facing arc 16 of the support frame 2 serves both mechanical and safety-related aspects with regard to jamming on moving parts.
  • the stationary support frame consists of a lower, centrally and symmetrically arranged below the seat part 5 base spar 17, which projects beyond a vertical through the pivot point A to the rear (point 18) and from the end (point 18) of a kind of bow-shaped branch 16 extends upwards to the lateral areas or points A of the back part 7 (see in particular FIGS. 6 and 7).
  • FIGS. 6 and 7 show an alternative embodiment of the mounting of the front area of the seat part 5.
  • a roller bearing along a curve 20 with the center point C and the radius c is selected.
  • the seat part 5 is firmly connected to a roller block 21 and a roller 22, which on the stationary curve 20 of the support frame 2 rolls.
  • the roller 22 corresponds to point D in FIGS. 4 and 5.
  • the imaginary connecting line B-D is drawn with reference number 19.
  • the limit position of the back adjustment is reached when the points B-C-D '' lie on a line 19 '', the point C in FIG. 6 being the center of the curve 14 and 20, respectively.
  • a chair cross 25 is indicated on the chair column 3 in FIG. 7.

Landscapes

  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Seats For Vehicles (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Mechanical Operated Clutches (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Selective Calling Equipment (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Hydrogenated Pyridines (AREA)
EP93113055A 1989-12-29 1990-12-21 Einrichtung zur Beeinflussung der Führung eines Bürostuhls oder dergleichen Withdrawn EP0578276A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93113055A EP0578276A1 (de) 1989-12-29 1990-12-21 Einrichtung zur Beeinflussung der Führung eines Bürostuhls oder dergleichen

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3943282 1989-12-29
DE3943282 1989-12-29
EP93113055A EP0578276A1 (de) 1989-12-29 1990-12-21 Einrichtung zur Beeinflussung der Führung eines Bürostuhls oder dergleichen

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP91901274.0 Division 1990-12-21

Publications (1)

Publication Number Publication Date
EP0578276A1 true EP0578276A1 (de) 1994-01-12

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ID=6396599

Family Applications (2)

Application Number Title Priority Date Filing Date
EP93113055A Withdrawn EP0578276A1 (de) 1989-12-29 1990-12-21 Einrichtung zur Beeinflussung der Führung eines Bürostuhls oder dergleichen
EP91901274A Expired - Lifetime EP0461228B1 (de) 1989-12-29 1990-12-21 Synchronverstelleinrichtung für bürostühle oder dergleichen

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP91901274A Expired - Lifetime EP0461228B1 (de) 1989-12-29 1990-12-21 Synchronverstelleinrichtung für bürostühle oder dergleichen

Country Status (12)

Country Link
US (2) US5251958A (da)
EP (2) EP0578276A1 (da)
JP (1) JP2978244B2 (da)
AT (1) ATE110543T1 (da)
AU (2) AU640441B2 (da)
BR (1) BR9007175A (da)
CA (1) CA2047746C (da)
DE (2) DE59006985D1 (da)
DK (1) DK0461228T3 (da)
ES (1) ES2061227T3 (da)
NO (2) NO913282L (da)
WO (1) WO1991009554A1 (da)

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US11109683B2 (en) 2019-02-21 2021-09-07 Steelcase Inc. Body support assembly and method for the use and assembly thereof
US11259637B2 (en) 2015-04-13 2022-03-01 Steelcase Inc. Seating arrangement
US11324325B2 (en) 2015-04-13 2022-05-10 Steelcase Inc. Seating arrangement
US11357329B2 (en) 2019-12-13 2022-06-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof

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US11096497B2 (en) 2015-04-13 2021-08-24 Steelcase Inc. Seating arrangement
US11259637B2 (en) 2015-04-13 2022-03-01 Steelcase Inc. Seating arrangement
US11324325B2 (en) 2015-04-13 2022-05-10 Steelcase Inc. Seating arrangement
US11553797B2 (en) 2015-04-13 2023-01-17 Steelcase Inc. Seating arrangement
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US11602223B2 (en) 2019-02-21 2023-03-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11910934B2 (en) 2019-02-21 2024-02-27 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11357329B2 (en) 2019-12-13 2022-06-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
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US11805913B2 (en) 2019-12-13 2023-11-07 Steelcase Inc. Body support assembly and methods for the use and assembly thereof

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DK0461228T3 (da) 1994-12-19
NO913282L (no) 1991-08-29
EP0461228A1 (de) 1991-12-18
CA2047746C (en) 2002-02-19
CA2047746A1 (en) 1991-06-30
JPH04504816A (ja) 1992-08-27
BR9007175A (pt) 1991-12-10
AU6968691A (en) 1991-07-24
NO960183D0 (no) 1996-01-16
DE4041157A1 (de) 1991-07-04
US5251958A (en) 1993-10-12
ES2061227T3 (es) 1994-12-01
ATE110543T1 (de) 1994-09-15
NO960183L (no) 1991-08-29
NO913282D0 (no) 1991-08-22
JP2978244B2 (ja) 1999-11-15
AU4905493A (en) 1993-12-23
AU662661B2 (en) 1995-09-07
US5366274A (en) 1994-11-22
WO1991009554A1 (de) 1991-07-11
AU640441B2 (en) 1993-08-26
DE59006985D1 (de) 1994-10-06
EP0461228B1 (de) 1994-08-31

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