EP3476254B1 - Sitzmöbel, insbesondere bürostuhl - Google Patents

Sitzmöbel, insbesondere bürostuhl Download PDF

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Publication number
EP3476254B1
EP3476254B1 EP17198337.2A EP17198337A EP3476254B1 EP 3476254 B1 EP3476254 B1 EP 3476254B1 EP 17198337 A EP17198337 A EP 17198337A EP 3476254 B1 EP3476254 B1 EP 3476254B1
Authority
EP
European Patent Office
Prior art keywords
seat part
backrest
seating furniture
seat
axis
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.)
Active
Application number
EP17198337.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3476254A1 (de
Inventor
Franz Ehrenleitner
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.)
EB-invent GmbH
EB INVENT GmbH
Original Assignee
EB-invent GmbH
EB INVENT GmbH
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 EB-invent GmbH, EB INVENT GmbH filed Critical EB-invent GmbH
Priority to PL17198337T priority Critical patent/PL3476254T3/pl
Priority to EP17198337.2A priority patent/EP3476254B1/de
Priority to US16/171,095 priority patent/US10973326B2/en
Publication of EP3476254A1 publication Critical patent/EP3476254A1/de
Application granted granted Critical
Publication of EP3476254B1 publication Critical patent/EP3476254B1/de
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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
    • 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
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/18—Chairs or stools with rotatable seat
    • 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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/002—Chair or stool bases
    • A47C7/004—Chair or stool bases for chairs or stools with central column, e.g. office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/024—Seat parts with double seats
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/14—Seat parts of adjustable shape; elastically mounted ; adaptable to a user contour or ergonomic seating positions

Definitions

  • the invention relates to seating furniture, in particular an office chair, according to the preamble of claim 1 and essentially to the DE 103 06 851 .
  • the invention relates to seating furniture of all types, with the proviso that they have at least one seat surface and a backrest which can be pivoted about a horizontal axis with respect to a base, usually called a support part.
  • this base can be the uppermost part of a height-adjustable column on a chassis, it can be a height-adjustable foot part that is fixedly mounted on the floor or rests freely on the floor, it can be a height-adjustable and / or longitudinally displaceable support part in a vehicle his and the like.
  • the explanation given below on the basis of an office chair is not to be understood as a restriction.
  • the Indian DE 103 06 851 revealed office chair which is based on its below Fig. 3 that are included in the login as Fig. 1 was taken, is intended to allow a particularly long leaning back and in this context deals with the real stability of the chair and the stability felt by the user by providing a fixed, horizontal first pivot axis for the backrest that intersects the vertical axis of the foot part.
  • a seat surface is articulated on this backrest about a pivot axis which is parallel to the first pivot axis and is provided at the lower end of the backrest.
  • the front area of the seat is supported by a roller on a bracket of the foot part.
  • a gas pressure spring or the like is provided in order to get back to the starting position.
  • an office chair with a one-piece seat is known in which the backrest and the seat are connected by means of two arms to form a four-bar articulation which is suspended from the support around the corner of the four-bar articulation formed by the two arms so as to be pivotable about a horizontal axis.
  • various types of releasable restraint guides between the arms or surfaces are optionally disclosed.
  • the seat should be without a return device be usable, but straightening up is like that Fig. 2 teaches directly, without such support at least laboriously, if not impossible.
  • an office chair with a one-piece seat surface is also known, in which the seat surface is mounted in its foremost area so as to be pivotable about a stationary, horizontal axis.
  • the seat also rests pivotably on an approximately vertically arranged leg, the other, lower, axis of rotation of the leg, on which a spring engages, is not stationary, but is subject to a rotary movement.
  • the leg has a 90 ° bend in the area of the seat, merges into an approximately horizontal area and, after another 90 ° bend, supports the backrest in its upper third in an articulated manner.
  • the backrest and seat are connected via an elastic area that forms a pseudo-joint. When leaning back, the pseudo-joint is shortened, the disadvantages specified below occur entirely, and the device is moreover complex and, because of the vertical limb, it is tall.
  • a chair with a split seat which however rigidly forms a lower part of the backrest, is known in which a kind of articulated square is formed by means of arms, the arms each engaging in the area of the division of the surfaces but on the outer surface.
  • This construction can be pivoted about a fixed axis which is arranged offset to the rear by about a third of the length of the horizontal arm.
  • a spring which acts in the area of the division of the seat, enables the seat to be straightened up from the tilted position.
  • This chair partially avoids the pull-out effect, but is complex and not particularly comfortable when leaning back due to the division of the seat that is far forward, which is otherwise not possible.
  • office chairs today Many, often contradicting, requirements are placed on office chairs today. Above all, it is desirable that the office chairs are ergonomically and thus also medically correctly designed, that is, allow appropriate back support and movement options for the user, who often spends hours sitting on these chairs, and even encourage such movements. On the other hand, it is the case today in numerous areas of application that the office chairs are no longer assigned to fixed users, but that the respective workers choose a kind of pool for their own Take an office chair on the working day, and here it is desirable that as little time as possible is needed to adapt the chair to the user.
  • a chair / office chair which has the features specified in the characterizing part of claim 1.
  • the seat part and the backrest are articulated to the support part via a first horizontal, transverse pivot axis, with this axis in front of the backrest and above the seat surface, preferably at least approximately in the upright position of the chair, the starting position Area of the total center of gravity of the moving parts of the user and the moving parts of the chair is in the starting position, and a second pivot axis parallel to this first pivot axis is provided between the backrest and the seat part, which in the starting position extends from the first pivot axis seen, preferably in a range within a maximum of 5 ° in the direction of the backrest and a maximum of 15 ° in the Direction away from the backrest with respect to the perpendicular and below the seat surface, preferably well below the seat surface, is arranged on the seat part; and that further the seat part is supported in its front third by means of kinematics by an arm connected
  • the seat part and thus the seat surface along an at least approximately vertical transverse plane into a front and a rear part which can be pivoted to a limited extent relative to one another about a horizontal pivot axis.
  • the rear part is permanently stationary with respect to the backrest, the front part performs a corresponding translational and rotating movement.
  • the separation area which can also be at a distance from the pivot axis, is preferably arranged in such a way that a user rests with his seat leg on the rear part and with the actual thigh area on the front part.
  • the front part is pivoted upwards with respect to the rear part, and thus raised, when it is being raised into the starting position via kinematics that are connected to the foot part or the support frame.
  • the Fig. 1 shows the office chair 1 of the prior art purely schematically in an already partially reclined position.
  • the backrest 15 is pivotably mounted on a substantially U-shaped support frame 5 via a first axis of rotation 12 by means of a pivot lever 16, which can also be designed as an armrest or carries one.
  • the backrest is pivotably connected to the seat part 14 via a second axis of rotation 20.
  • the seat part 14 is also guided over a sliding guide 18 and a corresponding roller at the end 10 of a support arm 9 which is connected to the support frame 5.
  • An absolutely necessary return device, the erecting aid 13, preferably a spring or the like, is attached at one end to the backrest 15 and the other end to the support arm 9 and is compressed when leaning back, thus supporting the erecting movement.
  • this device has the disadvantage that when leaning back, the shirt-pulling effect occurs, and that the lowering of the overall center of gravity of the moving parts, including the corresponding body parts of the user and the moving parts of the chair, the lifting aid 13 must be provided.
  • the first improvement according to the invention would be the clear forward position of the second axis of rotation 20, whereby when leaning back in the rearmost area of the seat part 14, that is the part that is adjacent to the backrest 15, an increase or at least a significant decrease the lowering takes place, which on the one hand the return device 13, the spring, superfluous on the other hand, it reduces the shirt-pulling effect and also improves the back support provided by the backrest.
  • the second axis of rotation 20 can be positioned between the backrest and the seat in the basic position just behind the first axis of rotation 12; between the vertical and the position of the axis, measured from the first axis of rotation 12, up to 5 °, possibly up to 15 °, are possible; it is also possible forwards up to 15 ° in front of the perpendicular through the first axis.
  • an office chair 1 in an embodiment with a split seat surface has: a seat part 14a fixed with respect to the backrest 15 and a movable seat part 14b which can be pivoted about a second axis 20 'with respect to the fixed seat part, the following features:
  • the fixed seat part 14a serves to support the seat leg of the user, so that when leaning back, there is no relative movement in the back area and thus no shirt-pulling effect;
  • the axis 20 disappears, the axis 20 'between the two seat parts has a completely different task and effect:
  • the movable, front seat part 14b is pivoted downwards so that the blood circulation in the thighs in the knee area is not squeezed.
  • a support part 7 Rotatably connected to the movable, front, seat part 14b is a support part 7, which is guided in the area of its free end, which in this embodiment is far below the seat surface, with a roller 18 or the like in a longitudinal guide 8 of a pivot rod 17.
  • the pivot rod 17 is in turn pivotable about an axis parallel to the axis 12 on the support column 3. In the fully erect rest position, the swivel rod 17 takes the full lines in due to the force of gravity Fig.
  • the support part 7 acts with a torque about the axis 20 'in the counterclockwise direction via the roller 18 or the like and the longitudinal guide (elongated hole) 8 on the pivot rod and is held in the position shown by its reaction force.
  • the front seat part (which then maintains its relative position with respect to the rear seat part) lifts the pivot rod 17 via the kinematics 7,8,18, the roller (or something similar) slides in its longitudinal guide 8 at the front until it reaches its highest possible angular position ( Fig. 3 , continuous lines, rest position), which is given either by the extended position or, better, by stops just in front of it to avoid a singularity.
  • the roller 18 is at the foremost (in the upright position, lowest) end of the longitudinal guide 8 and thus fixes the end position of leaning back.
  • the Figs. 7 and 8 illustrate the variant of the invention with an undivided seat surface 14: the second axis 20 is in the starting position, Fig. 7 , Solid lines, just in front of the vertical through the first axis 12, the undivided seat surface is provided in its front area with a roller 7 'which rests on a support 8' which is firmly connected to the support frame 5.
  • the angle between the backrest 15 and the seat 14 changes initially, up to a kinematics that shows this detail in the Fig. 9 is shown, a bolt 6 reaches the end of a link 11 and as a result, when leaning back further, takes the seat 14 with it, as the situation shown in dashed lines in FIG Fig. 8 shows.
  • the support 8 'does not have to be designed to be straight, nor to be connected to the support part 5 in a rotationally fixed manner; it can also, as the version after Figs 2 and 3 have a backdrop instead of an overlay.
  • an armrest 19 as part of the support frame 5 can also be clearly seen in these representations; here too, of course, an articulated, pivotable one is provided Support frame 5 articulated and fitting on the backrest 15 resting or guided armrest to be provided without problems.
  • the link in the side area of the backrest which is not provided with a reference number and which interacts with a bolt or the like in the support part 5, limits leaning back and thus relieves the kinematics in the area of the seat surface.
  • This arrangement can of course also be used in all other designs.
  • the longitudinal guide 8 does not need to be straight, dampers can be provided at the ends of the guides and / or on the sliding parts in order to avoid sudden braking, the components that ultimately limit the movement can be located elsewhere, in particular on the support column 3 , be provided in order to relieve the kinematics of these forces / moments; and the like.
  • the axes or joints described in the description and shown in the drawing can also be designed as so-called virtual axes, as is particularly the case in FIG WO2012 / 123102 , the WO2013 / 029069 , the DE 10 2012 002 402 or the WO2016 / 042127 , the DE 10 2014 013 560 or also the EP 2 686 145 the applicant is described.
  • the features according to the invention make it possible to dispense with expensive components, but it is of course possible to use or arrange them anyway. This applies, for example, to a raising aid, especially if an extreme, already practically lying end position of leaning back is provided. A spring or the like can then be used to support at least the beginning of the straightening up from this position.
  • An extendable leg support can be provided, by means of which the legs in the lower leg area are also supported in or near the end position, thus creating a recovery position.
  • This leg support can be extended or retracted manually or by means of spring force and / or can be fixed in various positions / continuously. It is also possible to make the end area of leaning back adjustable or to be able to fix various intermediate stages.
  • the Fig. 4 shows in two representations, left in the upright starting position, right partially leaning back, the forces occurring when using an office chair designed according to the invention with a split seat part and thus, taking into account the movement, the change in the potential energy due to the height shift of the overall center of gravity of the moving parts of the User and the moving parts of the chair. Fortunately, the proportionality of the user over a wide range of size and live weight due to the positions of the axles provided according to the invention enables comfortable use without energy storage, so that on the one hand costs during production and on the other hand adjustment effort during use is saved.
  • the axis of rotation of the chair back in the starting position of the office chair is slightly above and slightly behind the center of gravity of the user drawn in with his or her skeleton. Taking into account the body parts moved differently when leaning back and the chair parts moved in the process, these two elements practically coincide.
  • leaning back shown on the right, the user's center of gravity practically reaches the middle of the seat contact surface (without thighs), just behind the division of the seat, the user experiences an upright counter-force (counter-torque), which makes rocking and thus movement attractive.
  • counter-torque counter-torque
  • Alpha denotes the normal to the rear part of the seat, and when viewed together, the angle of inclination can be seen.
  • the terms "front”, “rear”, “top”, “bottom” and so on are used in their usual form and with reference to the object in its usual position of use. This means that in the case of a chair / office chair, the seat surface is the upper surface of the seat part, that the backrest on the chair is “back”, that the base is “down”, etc., etc.
  • the invention relates to a chair, in particular an office chair 1, with a base 2 with a support frame 5 on which a first axis of rotation 12 is arranged for a backrest 15 which can be pivoted between an upright starting position and a reclined resting position.
  • the lower area of the backrest 15 is articulated to a seat part 14; in the case of a one-piece seat part 14, the articulated connection about a second axis 20 is provided.
  • the second axis 20 lies below the first axis 12.
  • the rear seat part 14a is connected to the backrest 15 in a rotationally fixed manner.
  • the front seat part 14b or the one-piece seat part 14 is by means of a kinematics 7,8,17; 7 ', 8' is supported with respect to the support frame 5.
  • the front seat part 14b or the one-piece seat part 14 is carried along in a lowered manner relative to the rear seat part 14a or the backrest by means of kinematics 6, 11.
EP17198337.2A 2017-10-25 2017-10-25 Sitzmöbel, insbesondere bürostuhl Active EP3476254B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL17198337T PL3476254T3 (pl) 2017-10-25 2017-10-25 Meble do siedzenia, w szczególności krzesło biurowe
EP17198337.2A EP3476254B1 (de) 2017-10-25 2017-10-25 Sitzmöbel, insbesondere bürostuhl
US16/171,095 US10973326B2 (en) 2017-10-25 2018-10-25 Seating furniture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17198337.2A EP3476254B1 (de) 2017-10-25 2017-10-25 Sitzmöbel, insbesondere bürostuhl

Publications (2)

Publication Number Publication Date
EP3476254A1 EP3476254A1 (de) 2019-05-01
EP3476254B1 true EP3476254B1 (de) 2021-06-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17198337.2A Active EP3476254B1 (de) 2017-10-25 2017-10-25 Sitzmöbel, insbesondere bürostuhl

Country Status (3)

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US (1) US10973326B2 (pl)
EP (1) EP3476254B1 (pl)
PL (1) PL3476254T3 (pl)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3082108B1 (fr) * 2018-06-06 2020-06-05 Herve Thomas Dispositif d'assise physiologique
DE202021004046U1 (de) * 2020-02-21 2022-06-29 Aeteron Gmbh Stuhl
DE102021104004A1 (de) 2021-02-19 2022-08-25 Eb-Invent Gmbh Sitzmöbel
CN113475884B (zh) * 2021-08-12 2022-08-12 浙江安吉荣艺家具有限公司 一种舒适可调人体工学办公椅

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2527061B1 (fr) * 1982-05-19 1985-11-15 Ami Siege articule
DE3800754A1 (de) * 1987-06-24 1989-01-05 Horst Sondergeld Sitz fuer einen buerostuhl od. dgl. mit einem insbesondere durch koerpergewichtsverlagerung verstellbaren sitz- und rueckenteil
US5009466A (en) * 1988-04-25 1991-04-23 Perry Charles O Reclining chair
EP0559185A1 (de) * 1992-03-03 1993-09-08 Sdm Hansen Ag Synchronverstelleinrichtung für Bürostühle
DE10007103B4 (de) 2000-02-16 2004-01-29 Wolfgang Deisig Verstellbarer Arbeitsstuhl, insbesondere Bürostuhl
ITMI20022194A1 (it) * 2002-10-16 2004-04-17 Icf Spa Sedia avente sedile e schienale mobili.
DE10306851A1 (de) 2003-02-18 2004-08-26 Dózsa-Farkas, Andras Stuhl, insbesondere Büro- oder Arbeitsstuhl
DE102012002400B4 (de) 2011-03-17 2020-06-18 Eb-Invent Gmbh Manipulator
DE102012002402A1 (de) 2011-08-30 2013-02-28 Eb-Invent Gmbh Manipulator
US9968196B2 (en) 2014-09-18 2018-05-15 Eb-Invent Gmbh Kinematic mechanisms for furniture
DE102014013560A1 (de) 2014-09-18 2016-03-24 Eb-Invent Gmbh Möbel mit Schwenkvorrichtung für einen Schwenkteil

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
EP3476254A1 (de) 2019-05-01
US20190200763A1 (en) 2019-07-04
PL3476254T3 (pl) 2022-02-28
US10973326B2 (en) 2021-04-13

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