EP2844109B1 - Stuhl, insbesondere bürostuhl - Google Patents

Stuhl, insbesondere bürostuhl Download PDF

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Publication number
EP2844109B1
EP2844109B1 EP13725059.3A EP13725059A EP2844109B1 EP 2844109 B1 EP2844109 B1 EP 2844109B1 EP 13725059 A EP13725059 A EP 13725059A EP 2844109 B1 EP2844109 B1 EP 2844109B1
Authority
EP
European Patent Office
Prior art keywords
backrest
region
shoulder
elements
chair according
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
EP13725059.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2844109A1 (de
Inventor
Peter Horn
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.)
Itoki Corp
Original Assignee
Itoki Corp
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
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Publication of EP2844109A1 publication Critical patent/EP2844109A1/de
Application granted granted Critical
Publication of EP2844109B1 publication Critical patent/EP2844109B1/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
    • 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
    • A47C7/36—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/44—Supports for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • 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
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • 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
    • 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
    • A47C7/36—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/46—Supports for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs

Definitions

  • the invention relates to a chair, in particular an office chair having the features of the preamble of claim 1.
  • Such a chair is for example from the EP 2 173 218 B1 refer to.
  • Modern office chairs are usually equipped with a so-called synchronous mechanism, which ensures a correlated movement of a seat and a backrest with a tilt of the backrest, in such a way that at the same time with a tilt of the backrest, a rear seating area is also inclined.
  • the synchronizing mechanism is usually below the seat in a carrier unit, here referred to as base carrier unit integrated.
  • This support unit is usually mounted on a support beam and connected via this with a pedestal.
  • various designs of synchronous mechanisms are known.
  • Mechanisms with an automatic weight adjustment are also known in which the restoring force acting on the backrest automatically adapts to the weight of the respective current user.
  • An example of an office chair with synchronous mechanism and an automatic weight adjustment is from the mentioned EP 2 173 218 B1 refer to.
  • the EP 2 100 539 A1 to a chair having a seat surface, a backrest, wherein the backrest is pivotally connected to the seat surface, and a support structure that is pivotally connected to a seat surface support.
  • the object of the invention is to provide such a chair, which is equipped in particular with a synchronous mechanism, with improved comfort properties.
  • the chair in particular an office chair, then comprises a seat mounted on a base support unit and a backrest having a lower backrest area and has an upper shoulder portion and which is attached to a backrest support.
  • the backrest support is in particular approximately J-shaped and rotatably mounted on the base support unit about an inclination axis.
  • the base support unit itself in turn preferably carries the synchronous mechanism and a seat-forming upholstered seat support.
  • the shoulder area is tiltable about a shoulder axis. In that regard, a first articulated connection is formed between the shoulder region and the backrest support.
  • a mechanical positive guidance is achieved such that, given an inclination of the shoulder region about the shoulder axis, the angular orientation of the shoulder region varies relative to the lower back area and in particular the lordosis of the backrest forward, ie towards the seat, is curved (at an inclination of the shoulder area about the shoulder axis from an upright position to a reclined position).
  • the lower backrest area is guided at its lower pivot point on the seat or on the backrest support.
  • the articulation or guide at the lower end of the lower backrest region therefore serves in particular for length compensation in the case of the inclination of the backrest about the shoulder axis. Overall, this positive guide allows bulging the backrest in the lumbar region forward. As a result, the overall comfort of the chair is increased.
  • the backrest has a central region and laterally adjacent thereto each have a lateral area, which are directed to better lateral guidance forward, ie towards the seat.
  • This orientation of the lateral regions in relation to the central region is also forcibly changed with an inclination of the shoulder region about the shoulder axis. In such a way that, with an inclination of the shoulder region towards the rear, the lateral regions virtually swing forward and thus provide improved lateral guidance. So there is a total of a synchronous, positively driven movement such that in the lumbar region of the body undergoes support and at the same time lateral areas are led forward for a better lateral guidance.
  • the backrest In order to enable the pivoting of the lateral areas to the front they are pivotable relative to the central region. Therefore, the backrest itself has areas on its side, which are folded over joints with a vertical orientation to the front or at least bent. Therefore, in addition to the typically horizontal articulated connection between shoulder region and lower back region, two substantially vertical articulated connections between the respective middle region and the lateral regions are also formed on the backrest itself. These articulated connections can be formed by elastic (bending) areas or by joints.
  • the lower backrest area is also pivotally connected to the seat. Due to the direct connection of the backrest to the seat, improved guidance of the body over all inclination positions is achieved in the transition region between the seat and the backrest.
  • the seat in this case has a rear seat part, which is hinged to a front seat part.
  • the two seat parts are about an axis, hereinafter referred to as seat axis, rotatably supported by a corresponding hinge connection together.
  • seat axis axis
  • the rear seat part on the one hand with the front seat part and on the other hand with the lower backrest area is carried out in a simple manner a length compensation at an inclination of the shoulder area about the shoulder axis, in which the lower backrest area is pulled upwards towards the shoulder axis.
  • the rear seat part is pulled over the lower backrest area upwards with an inclination of the shoulder region to the rear and thus supports the body in the transition region between the seat and backrest.
  • the two seat parts are usually provided by plates or shells, ie mechanically rigid units of the seat support, on which the seat upholstery is applied.
  • the seat axis is on the one hand behind the tilt axis, ie oriented towards the backrest. Furthermore, the seat axis and / or preferably also the inclination axis, arranged close to a body rotational axis, which is defined in particular by the hip joint. As a result, Relatiwerschiebept between body and seat or backrest are kept as low as possible at an inclination.
  • the shoulder region is followed by another upper back region, which serves for head support and can also be referred to as the head region.
  • this backrest area is connected to the shoulder area, in an expedient embodiment also articulated.
  • the upper backrest region has laterally swing-away partial areas, which are likewise connected to the other side areas. Overall, this results in a forced operation and a forced folding the side areas forward.
  • the shoulder area is arranged counter to a restoring force on the backrest support tiltable about the shoulder axis.
  • This is preferably formed by a spring element or a resilient design of the joint between the backrest support and the shoulder area.
  • a spring element is arranged between the backrest support and the backrest, which exerts a restoring force on the shoulder region.
  • the spring element is formed, for example, as a clamped between backrest support and backrest elastic element, a (pressure) spring or by integral training in the hinge connection.
  • the restoring force is expediently adjustable.
  • the backrest is formed in accordance with a first preferred embodiment variant by a circumferential and with a fabric, such as a net fabric, covered frame.
  • a fabric such as a net fabric, covered frame.
  • this has upper, lateral frame parts and lower, lateral frame parts in the lower back region, wherein the frame parts are connected to one another in an articulated manner.
  • the upper and lower frame parts are preferably arranged at an angle to each other in such a way that in the lumbar region and thus in particular in the region of the hinge connection between the upper shoulder region of the backrest and the lower backrest region of the frame is deflected forward to the seat. In this deflection the articulation and thus the Lordosenachse is formed.
  • the lateral frame parts are - viewed in a rear view - also formed laterally outwardly extending at an angle.
  • the frame further has a lower and an upper transverse strut, which are in particular bent.
  • the upper transverse strut is preferably articulated to the backrest support so that the articulated connection between the shoulder region and the backrest support is formed via this connection.
  • the cross struts are still articulated in an expedient embodiment and in particular connected to the above-mentioned vertical axes with the upper frame part or lower frame part. Due to the articulated connection
  • the cross braces is therefore created the possibility that the lateral frame parts swivel inward with an inclination of the shoulder region or swivel outwards again in reverse movement sequence. This movement takes place forcibly due to the constraining forces acting on the frame during the tilt adjustment.
  • the two frame parts are pivoted in relation to the transverse struts, that they are thus pivoted towards each other and to a central region. This results in the desired support in the lumbar region and the additional lateral support in the side areas.
  • the frame is formed in particular only peripherally circumferentially, therefore, has no further support struts for supporting the body.
  • the body support takes place exclusively through the fabric cover.
  • the transverse struts, in particular the upper cross member, are bent back and preferably do not support the body.
  • a lumbar support is additionally arranged, which is connected to the lower cross member. It is preferably mechanically non-rotatably connected, so that the lumbar support automatically follows a movement of the transverse strut. Due to the required length compensation in a buckling of the lumbar region forward usually takes place automatically a rotation of the lateral lower frame part. At this the cross strut is mechanically firmly connected, so that the angular orientation of the lower frame part is transmitted via the lower crossbar on the lumbar support.
  • the frame is formed overall as a one-piece frame, for example as a cast or molded plastic part.
  • the frame is therefore formed in defined areas by material reductions bending elastic.
  • an upper backrest part for the head support is also formed, which is defined by an additional upper frame, which is preferably also formed integrally with the rest of the frame.
  • This upper frame receives the upper transverse strut and its lateral frame parts adjoin the lateral frame parts of the shoulder region, in particular on the joint connections defined over the vertical axes.
  • the backrest has a plurality of backrest elements pivotably secured together, namely at least one main backrest element defining the shoulder region, and a lower backrest element which is hinged to the lower end of the mainback element and which forms the lower backrest region.
  • the individual backrest elements are plate-shaped or cup-shaped or have such.
  • the backrest is mosaic-like formed from a plurality of interconnected, plate-like backrest elements.
  • lateral cheek elements are preferably hinged to the main backrest element and to the lower backrest element.
  • cheek elements are formed, which are hingedly connected to the upper back element and at the same time hinged to the cheek elements of the shoulder area.
  • the individual backrest elements are each wedge-shaped or trapezoidal in shape, wherein adjacent backrest elements are each arranged in an advantageous manner fallen to each other.
  • Both the shoulder region and the lower back region are therefore each formed by three separate backrest elements, which are preferably each formed trapezoidal and fallen to each other.
  • the mutually adjacent trapezoidal elements between the shoulder region and the lower back region are also collapsed with respect to one another, so that long sides or short sides are respectively arranged opposite one another.
  • the trapezoidal configuration is chosen in particular such that the central region between the cheek elements is tapered in the lordosis. At the same time, the cheek elements are widened in this area.
  • the adjoining edges of the backrest elements each define the joints. Due to the approximately trapezoidal or wedge-shaped configuration, therefore, the vertical axes between the central backrest elements and the cheek elements do not run exactly in the vertical direction. If the present case is therefore referred to as a vertical axis, this is merely an approximately vertical orientation, in which a deviation from the exactly vertical alignment of, for example, +/- 30% is made possible. This applies to both variants.
  • the individual backrest elements are expediently hinged to each other at their adjoining sides or edges in the manner of film hinges.
  • the backrest elements are formed according to a first variant as a single separate plates or shells in a preferred embodiment. These are connected to each other either by a respective elastic flat hinge strip, for example a textile or rubber-elastic material. Alternatively, they are used in a large-area, in particular the entire surface of the backrest elements covering elastic cover (padded cover). It can be sewn into this cushion cover pockets into which the individual plate-shaped backrest elements are inserted.
  • a plurality of the back elements are formed by a one-piece plastic part (for example injection molding).
  • the individual backrest elements are connected to each other via material bridges, i. delimited by notches or material tapers in the one-piece part of each other. These notches at the same time define articulated joints designed in the manner of film hinges.
  • This one-piece plastic backrest is then usually covered with a cushion.
  • the office swivel chair shown in the figures has in both embodiments, each a base support unit 2, to which a seat 4 and a backrest support 6 are attached.
  • the backrest support 6 is rotatably mounted on the base support unit 2 about an inclination axis A1.
  • the base support unit 2 receives a synchronous mechanism, not shown here. Also included in it is a mechanism for weight adjustment. This can be designed as an automatic weight adjustment or as a manually adjustable weight setting.
  • a backrest 8 is fixed, which is divided into several subregions. Thus, it has an upper shoulder region 10 and a lower back region 12. In both embodiments, an upper back region 14 forming a head region adjoins the upper shoulder region 10.
  • the backrest 8 has a central region 16, to each side of which a lateral region 18 connects.
  • the shoulder region 10 and the lower back region 12 adjoin one another in a lordosis region 20 and are attached to one another via an articulated joint in an articulated manner. They can therefore be inclined to each other about a common axis, hereinafter referred to as lordosis axis A2, so that their angular orientation to each other changes.
  • the shoulder region 10 in turn is connected in an articulated manner to the backrest support 6 via a further articulated connection, which permits an inclination of the shoulder region 10 about a horizontal axis, referred to below as a shoulder axis A3.
  • a shoulder axis A3 a horizontal axis
  • lateral, substantially vertically extending vertical axes namely an upper vertical axis B2 in the shoulder region 10 and a lower vertical axis B2 in the lower back region 12, are formed.
  • the vertical axes B1, B2 allow pivoting of the lateral areas 18 forward towards the seat 4th
  • the backrest 8 is mechanically connected directly to the seat 4.
  • a direct connection between the backrest 8 and the seat 4 is formed.
  • the seat 4 has a rear, plate-shaped seat part 22, which is mechanically connected to the lower backrest region 12.
  • the connection takes place in particular via an articulated connection, wherein at least a certain pivoting mobility is made possible around a connecting axis A4.
  • the rear seat part 22 itself is pivotally attached to a front seat part 24 via a further articulated connection about a seat axis A5.
  • the two seat parts 22,24 are plate-shaped or cup-shaped and form in particular a two-part seat support, which ultimately carries the padding.
  • the backrest 8 is formed by a plurality of plate-like or shell-shaped back elements, namely a main backrest element 28, which forms the central region of the shoulder region 10, a lower back element 30, which forms the central lower back region 12, an upper back element 32, which is the middle upper Lehnen Scheme 14 forms.
  • These three backrest elements 28,30,32 are each connected to each other via horizontally extending joints.
  • the main backrest element 28 and the lower backrest element 30 are connected to one another in an articulated manner about the lordosis axis A2.
  • the upper backrest element 32 is connected to the main backrest element 28 about a head axis A6 tiltably connected to the main backrest element 28.
  • a side cheek element 34 connects to each of these backrest elements 28 to 32. These are each hingedly connected to adjacent cheek elements 34. As in particular from the side representations of the 3 and 4 As can be seen, the cheek elements 34 extend laterally forward in the direction of the seat 4, are therefore oriented at an angle to the back elements 28 to 32 of the central region 16.
  • the individual backrest elements 28 to 34 each have a trapezoidal or wedge or triangular base surface, so that they taper from a long side to a short side or taper to a point.
  • the individual backrest elements 28 to 34 are each arranged in a downward position with respect to each other, so that - viewed in the vertical direction - adjacent backrest elements 28 to 34 abut each other on their long sides and short sides, respectively.
  • a waist is formed in the lumbar region 20.
  • the cheek elements 34 are here pulled laterally forward.
  • the rear seat portion 22 is in the connection region to the lower backrest portion 12, ie in the region of the connecting axis A4, at an inclination of the shoulder region 10th pulled backwards in about vertical direction. At the same time there is a pivotal movement of the rear seat portion 22 relative to the front seat portion 24.
  • the rear seat portion 22 is therefore obliquely upward tracked as soon as an inclination of the shoulder portion 10 about the shoulder axis A3.
  • the shoulder axis A3 is generally formed approximately in the upper third of the shoulder region.
  • a tilt adjustment of the shoulder region 10 takes place simultaneously with an inclination position of the entire backrest 8 relative to the base support unit 2, that is, at an inclination of the backrest support 6 about the inclination axis A1.
  • the shoulder region 10 is pulled obliquely rearward on the shoulder axis A3. This is done in comparison to the in Fig. 3 illustrated initial stretch of the backrest, so so that the shoulder region 10 about the shoulder axis A3 is inclined towards the front seat 4, whereby the angle between the shoulder region and the lower back region 12 is increased. As a result, the rear seat part 22 is pulled down in the direction of the backrest support 6 overall. The angle between the rear seat portion 22 and the lower backrest portion 12, which at the in the Fig. 3 shown starting position is almost at right angles, is slightly reduced.
  • an interconnected joint or link chain is formed by the individual axes A1 to A6, which at a tilt adjustment leads to a desired forced adaptation of the contour of the backrest 8.
  • the backrest 8 rather consists of a frame 38, which is formed by lower frame parts 40 in the lower back region 12, upper frame members 42 in the shoulder region 10, a lower cross member 44 and an upper cross member 46.
  • the upper cross member 46 also forms a lower cross member a head frame 48 in the region of the upper backrest region 14.
  • the head frame 48 has, in continuation of the upper frame parts 42, opposite side parts 50 and a further, uppermost transverse strut 52.
  • the upper transverse strut 46 and the further, uppermost transverse strut 52 are in this case bulged towards the rear.
  • the frame parts 40,42 are - viewed from the side - arranged at an angle to each other, so that the lumbar region 20 is bulged forward.
  • the frame 38 is covered with a fabric 54 as a whole.
  • a fabric 54 as a whole.
  • ie material tapers 56 are in the frame 38 notches.
  • corresponding, vertically oriented indentations 56 are formed at the transition of the upper frame part 42 to the upper transverse strut 46 and the lower frame part 40 to the lower transverse strut 44.
  • the upper cross member 46 is connected to a front end of the backrest support 6, wherein at this connection point a pivoting movement between the upper cross member 46 and the backrest support 6 is made possible, whereby the shoulder axis A3 is defined.
  • a lumbar support 58 arranged, which is rotatably connected via a retaining web with the lower cross member 44.
  • the Fig. 5 shows the unloaded starting position with upright backrest 8.
  • Fig. 6 a position in which only an inclination of the shoulder portion 10 about the shoulder axis A3 takes place (no inclination about the inclination axis A1). That is, the head frame 48 has tilted backward and is now in an approximately upright position after the head frame 48 was previously inclined forward. The fabric 54 is therefore pulled slightly upwards overall.
  • the required length compensation takes place via the rear seat part 22, which is pulled up around the seat axis A5.
  • a change in the angular position between the rear seat part 22 and the lower backrest part 12 can take place, which are preferably held elastically to each other about the connecting axis A4.
  • In the embodiment takes place in this illustrated movement, starting from the Fig. 5 towards the Fig. 6 no change in the angular position between the two frame parts 40,42. So there is no rotation around the lordosis axis A2.
  • the Fig. 7 shows finally a superimposed combined tilt adjustment, in which both the shoulder area 10 - as in Fig. 6 - Is tilted to the rear about the shoulder axis A3 and at the same time also the total backrest 8 about the inclination axis A1 is tilted backwards. Similar to the situation in the first embodiment according to Fig. 4 In this case, a stretching of the backrest 8 down, wherein the rear seat part 22 in comparison to the in Fig. 5 pivoted downwards starting situation shown. At the same time, the shoulder region 10 tilts backwards. As a result of this stretching, the lateral frame parts 40, 42 inwardly swivel inward about the vertical axes B1, B2 and provide better lateral guidance.
  • the lordosis in the lordosis area 20 is additionally supported by the lumbar support 58.
  • LIST OF REFERENCE NUMBERS 2 Based support unit A1 tilt axis 4
  • Seat A2 Lordosenachse 6 backrest support A3 shoulder axis 8th backrest A4 connecting axis 10 upper shoulder area A5 seat axis 12 lower backrest area A6 head axis 14
  • Main rest element 30 lower back element 32
  • lower frame part 42
  • upper frame part 44 lower crossbar 46 upper cross strut 48 head frame 50 side panel 52 further cross strut 54 material 56 notches 58 lumbar support

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
EP13725059.3A 2012-05-04 2013-04-25 Stuhl, insbesondere bürostuhl Active EP2844109B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012207467 2012-05-04
PCT/EP2013/001241 WO2013164078A1 (de) 2012-05-04 2013-04-25 Stuhl, insbesondere bürostuhl

Publications (2)

Publication Number Publication Date
EP2844109A1 EP2844109A1 (de) 2015-03-11
EP2844109B1 true EP2844109B1 (de) 2017-08-30

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ID=48520879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13725059.3A Active EP2844109B1 (de) 2012-05-04 2013-04-25 Stuhl, insbesondere bürostuhl

Country Status (5)

Country Link
US (1) US9609952B2 (enrdf_load_stackoverflow)
EP (1) EP2844109B1 (enrdf_load_stackoverflow)
JP (4) JP6067104B2 (enrdf_load_stackoverflow)
CN (1) CN104470404B (enrdf_load_stackoverflow)
WO (1) WO2013164078A1 (enrdf_load_stackoverflow)

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JP6067104B2 (ja) 2017-01-25
US9609952B2 (en) 2017-04-04
JP2015519111A (ja) 2015-07-09
JP2016093536A (ja) 2016-05-26
US20150091353A1 (en) 2015-04-02
CN104470404B (zh) 2019-07-05
JP6152175B2 (ja) 2017-06-21
JP2016105787A (ja) 2016-06-16
JP6110520B2 (ja) 2017-04-05
CN104470404A (zh) 2015-03-25
JP6110521B2 (ja) 2017-04-05
EP2844109A1 (de) 2015-03-11
WO2013164078A1 (de) 2013-11-07
JP2016073806A (ja) 2016-05-12

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