EP0461228B1 - Synchronverstelleinrichtung für bürostühle oder dergleichen - Google Patents

Synchronverstelleinrichtung für bürostühle oder dergleichen Download PDF

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Publication number
EP0461228B1
EP0461228B1 EP91901274A EP91901274A EP0461228B1 EP 0461228 B1 EP0461228 B1 EP 0461228B1 EP 91901274 A EP91901274 A EP 91901274A EP 91901274 A EP91901274 A EP 91901274A EP 0461228 B1 EP0461228 B1 EP 0461228B1
Authority
EP
European Patent Office
Prior art keywords
seat part
hinge
point
back rest
support stand
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
EP91901274A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0461228A1 (de
Inventor
Hans Roericht
Horst Fleischmann
Franz Biggel
Burkhard 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
Publication of EP0461228A1 publication Critical patent/EP0461228A1/de
Application granted granted Critical
Publication of EP0461228B1 publication Critical patent/EP0461228B1/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
    • 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 synchronous adjustment device for office chairs, seating or the like. According to the preamble of the main claim.
  • 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.
  • Known office chairs have a relatively complicated mechanical structure, which is characterized by a large number of articulation points in order to coordinate the sequence of movements between the seat part and the back part.
  • the inclination adjustment of the back part should take place in such a way that a counter pressure or a corresponding counter-torque is generated with increasing inclination.
  • the synchronous d. H. simultaneous adjustment of the seat part serves to adapt the chair to the ergonomics of the user. For the adjustment, additional pressure units are usually used to influence and dampen the individual movements.
  • a particular problem with known office chairs is that they generally depend on the weight or size of the User person must be set. A large and heavy user exerts a much greater force on the back part than a lighter and smaller user. The same applies to the load on the seat part, the movement of which is associated with the movement of the back part.
  • a generic chair mechanism has become known from US Pat. No. 4,877,291 (Taylor).
  • This chair mechanism works on the well-known principle of garden deck chairs, i. H. the seat part is suspended on two levers and can be swiveled in the manner of a parallelogram guide.
  • a front lever is attached to a seat back and a rear lever to a chair frame in such a way that there is a suspended parallelogram guide.
  • This mechanism has the disadvantage that the seat part can swing through a stretched position with a correspondingly strong deflection of the back part, so that there is an unlimited stretched position. This is negative for a conventional office chair, since other limiting devices for backrest adjustment are to be provided.
  • the invention has for its object to avoid the disadvantages described in the prior art or to propose a chair mechanism as a synchronous mechanism that is extremely simple and effective, d. H. which has few mechanical means and can possibly do without additional energy accumulators and pressure units.
  • the invention is based on the main idea that a restoring movement of the back part when adjusting the backrest must take place depending on the weight of the user.
  • the restoring torque must automatically increase with the increase in the inclination, since the lever arm for the torque increases continuously with the increase in the inclination. As a result, the counter moment must also increase continuously as the inclination of the back part increases.
  • such a counter-torque or restoring torque is initially achieved in the back inclination adjustment in that the back part is rotatably mounted at a height distance from the seat part and a restoring force which counteracts the leaning force of the user in the back rest point acts in the lower region of the back part.
  • the back part therefore acts like a seesaw and is mounted on the support frame so that it can rotate and rotate.
  • the restoring force or counterforce in the lower region of the back part results from the weight of the user, which brings about a counter-moment via the connection of the seat part to the back part and in the front seat region via the deflection.
  • the counter torque is greater, the greater the inclination of the back part. This results from the leverage effects due to the deflection of the upper and lower part of the back part and the seat part in the front area in connection with the fixed pivot points.
  • the support frame is pivotally connected to the seat part in the front region by means of a pendulum lever which moves the movable part Storage of the seat part allows.
  • a pendulum lever instead of a pendulum lever, the front area of the seat part with the support frame can also be guided over a link guide or over a curve guide.
  • the movement of the front region of the seat part is brought about synchronously by the adjustment of the back part, with both the front and the rear region of the seat part carrying out an upward movement, which generates a lever arm for the restoring moment that becomes larger.
  • the front area of the seat part is therefore guided via the pendulum lever or by means of a link guide or a curve guide so that an upward pivoting movement occurs when the back part is loaded occurs with increasing counter moment.
  • This upward swiveling movement is counteracted by the weight of the user, whereby an additional restoring moment of the back part is generated.
  • the support frame consists of a narrow elongated base spar, which is arranged below the seat part and extends beyond the rear region of the seat part.
  • a bow-like cross-branch or an arch-like bracket attached, which connects the base spar with the two lateral bearing points for the back part.
  • the two armrests can be directly connected to this arched bracket.
  • the office chair 1 shown in FIG. 1 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. 1 and 2, the seat part 5 is thereby raised to the position 5 '. The length of the lever arm of the pendulum lever 8 is indicated by "c".
  • the office chair is approximately in the neutral starting position.
  • the perpendiculars have a distance d> 0 through points A and B.
  • the result of this is that any load on the seat part 5 already generates a restoring torque, which is shown as a restoring torque 11 '.
  • the horizontal distance "e" between points C, D also generates an additional restoring moment.
  • the body weight 15 of the user is shown in FIGS. 1 and 2.
  • This body weight 15 can be broken down into a parallelogram of forces with the forces 15 'and 15''as shown in FIG. 1, the force 15' being projected into point B (same angle ⁇ 1), and perpendicular to the connecting line 10 -B stands.
  • the force 15 'thus generates a counter torque 11', which results from the amount of the force 15 'times the lever arm b. 1 and 2, the force 15 'grows with increasing deflection of the back part 7 to the rear (angle ⁇ 1 ⁇ ⁇ 2), ie with Enlargement of section d.
  • 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 restoring force or the restoring torque 11 ′ increases with increasing back inclination, due to the increasing in this case Lever arms d 'and e'. This leads to a progressive increase in the restoring torque and a soft limitation of the backrest adjustment.
  • 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. 1 and 2).
  • 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. 3 and 4).
  • FIGS. 3 and 4 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 that rolls on the fixed curve 20 of the support frame 2.
  • the roller 22 corresponds to point D in FIGS. 1 and 2.
  • 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. 3 being the center of the curve 14 and 20, respectively.
  • a back part 7 formed on the back is shown, with a bulge 23 formed in the lower region.
  • This bulge 23 enables the user to sit even further back in the chair so that the schematically illustrated hip pivot point 24 of a user comes closer to pivot point B. This reduces the so-called "shirt pull-out effect" to a minimum.
  • a chair cross 25 is indicated on the chair column 3 in FIG. 4.
  • FIGS. 1 to 4 can in principle be used without any damping means or also restoring means. As described, this results from the torque 11 by the back force 9 and the counter torque 11 ′ from the weight force 15.
EP91901274A 1989-12-29 1990-12-21 Synchronverstelleinrichtung für bürostühle oder dergleichen Expired - Lifetime EP0461228B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3943282 1989-12-29
DE3943282 1989-12-29
PCT/DE1990/000994 WO1991009554A1 (de) 1989-12-29 1990-12-21 Synchronverstelleinrichtung für bürostühle oder dergleichen

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP93113055.3 Division-Into 1993-08-14

Publications (2)

Publication Number Publication Date
EP0461228A1 EP0461228A1 (de) 1991-12-18
EP0461228B1 true EP0461228B1 (de) 1994-08-31

Family

ID=6396599

Family Applications (2)

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

Family Applications After (1)

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

Country Status (12)

Country Link
US (2) US5251958A (da)
EP (2) EP0461228B1 (da)
JP (1) JP2978244B2 (da)
AT (1) ATE110543T1 (da)
AU (2) AU640441B2 (da)
BR (1) BR9007175A (da)
CA (1) CA2047746C (da)
DE (2) DE4041157A1 (da)
DK (1) DK0461228T3 (da)
ES (1) ES2061227T3 (da)
NO (2) NO913282L (da)
WO (1) WO1991009554A1 (da)

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Also Published As

Publication number Publication date
ATE110543T1 (de) 1994-09-15
NO913282L (no) 1991-08-29
NO913282D0 (no) 1991-08-22
ES2061227T3 (es) 1994-12-01
AU640441B2 (en) 1993-08-26
AU6968691A (en) 1991-07-24
NO960183L (no) 1991-08-29
JP2978244B2 (ja) 1999-11-15
JPH04504816A (ja) 1992-08-27
WO1991009554A1 (de) 1991-07-11
DK0461228T3 (da) 1994-12-19
EP0578276A1 (de) 1994-01-12
DE4041157A1 (de) 1991-07-04
DE59006985D1 (de) 1994-10-06
EP0461228A1 (de) 1991-12-18
NO960183D0 (no) 1996-01-16
AU4905493A (en) 1993-12-23
US5366274A (en) 1994-11-22
US5251958A (en) 1993-10-12
CA2047746C (en) 2002-02-19
BR9007175A (pt) 1991-12-10
CA2047746A1 (en) 1991-06-30
AU662661B2 (en) 1995-09-07

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