EP2095741B1 - Office chair - Google Patents

Office chair Download PDF

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Publication number
EP2095741B1
EP2095741B1 EP20090000354 EP09000354A EP2095741B1 EP 2095741 B1 EP2095741 B1 EP 2095741B1 EP 20090000354 EP20090000354 EP 20090000354 EP 09000354 A EP09000354 A EP 09000354A EP 2095741 B1 EP2095741 B1 EP 2095741B1
Authority
EP
European Patent Office
Prior art keywords
seat
chair
back rest
coupling
backrest
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 - Fee Related
Application number
EP20090000354
Other languages
German (de)
French (fr)
Other versions
EP2095741A1 (en
Inventor
Andreas Krob
Joachim BRÜSKE
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.)
Thonet GmbH
Original Assignee
Thonet 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
Priority to DE200810011309 priority Critical patent/DE102008011309B3/en
Application filed by Thonet GmbH filed Critical Thonet GmbH
Publication of EP2095741A1 publication Critical patent/EP2095741A1/en
Application granted granted Critical
Publication of EP2095741B1 publication Critical patent/EP2095741B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255Reclining 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
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03205Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • A47C1/03233Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by means of a rack-and-pinion or like gearing mechanism
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs

Description

  • The invention relates to a chair or armchair, in particular an office chair or chair with tilting backrest.
  • In conventional chairs with reclining backrest, while tilting the backrest, an upward or downward movement relative to the seat surface occurs. As a result, there also occurs a relative movement between the reclining backrest and the back of a user of the chair. The resulting friction is undesirable, since it can cause a hand on the one hand unpleasant feeling in the user of the chair and on the other hand causes tops of the user's clothing to be displaced, for example, that a shirt is pulled out of the pants. This feature of conventional chairs with reclining backrest results in a limited comfort of use of these chairs.
  • It is therefore an object of the invention to provide a chair or armchair, which on the one hand has an increased ease of use and on the other hand is easy and inexpensive to manufacture.
  • The object is achieved by a chair according to claim 1. Preferred embodiments are subject of the dependent claims.
  • Chair according to the invention
  • The present invention relates to a chair, in particular a rotating office chair, comprising:
    • at least two seat supports, each further comprising an upper sheet guide and a lower sheet guide;
    • at least two backrest supports, each further comprising a positively driven portion;
    • arranged on the backrest support backrest, wherein the positively driven portion of the backrest support is guided between each of the upper sheet guide and the lower sheet guide of the corresponding seat support, so that the backrest support are tilted relative to the seat carriers, wherein the upper sheet guide and the lower sheet guide at least partially as a circular arc section are formed and wherein the circular arc portion of the upper sheet guide and the circular arc portion of the lower sheet guide have the same center of the circle H. Next, the office chair includes a base support.
    • Such a chair is out for example US 2007/0 273 189 A1 known.
    • According to the invention, the office chair comprises at least one tension spring lever, which is articulated by means of a rear seat coupling axis with the seat support;
    • at least two coupling levers which are hingedly connected by means of a front seat coupling axis with the seat support, wherein the at least one tension spring lever by means of a main axis with the base support (3) is hingedly connected and the at least two coupling levers are pivotally connected by a base coupling axis with the base support;
    • at least two tie rods, which are arranged articulated on the at least one backrest support and
    • at least two pull levers, which are arranged on the main axis and which are each articulatedly connected to the at least two tie rods.
    definitions
  • For ease of understanding the invention, a variety of terms are defined by way of example below.
  • The chair can be arranged on a flat floor surface. For the unambiguous description of directions and geometric relations, it will be assumed in the following description that the plane bottom surface is defined by the two orthogonal direction vectors of the x and y direction of a Cartesian coordinate system. In particular, the x-direction coincides substantially with the viewing direction of a user of the chair, ie, the x-direction points to the front. The y-direction is perpendicular to the x-direction and is essentially to the left as seen by the user. To the right, so perpendicular to the bottom surface, the z-direction extends upward, ie opposite to the direction of gravity.
  • Extent and / or displacement direction (s) can be given in relation to the orthogonal Cartesian coordinate system thus defined. In the following description, when used in conjunction with a directional indication, the term "substantially" means that the direction to be indicated is less than about ± 20 degrees, preferably less than about ± 15 degrees, of the referenced direction differs by less than about ± 10 degrees, and more preferably by less than about ± 5 degrees, in particular by less than about ± 2 degrees. The term "substantially" may in particular describe a slight deviation from a desired value, in particular a deviation within the manufacturing accuracy and / or in the context of the necessary accuracy, so that an effect is maintained as it is present at the desired value. The term "substantially" may therefore include a deviation of less than about 30%, less than about 20%, less than about 10%, less than about 5%, less than about 2%, preferably less than about 1% of a desired value or set position, etc. include. The term "substantially" includes the term "identical," i. without deviation from a desired value, a desired position, etc.
  • When the term "about" is used in the following description in connection with an indication in the unit of measure, this means, in particular, that the direction to be specified differs from the reference direction by less than ± 15 degrees, and preferably by less than ± 10 degrees, more preferably deviates by less than ± 5 degrees, more preferably by less than ± 2 degrees, in particular by less than ± 1 degree.
  • The aforementioned positions and directions are exemplary and serve in particular as a reference for describing eg sides and extensions of the chair and / or for the determination of directions, for example, to specify clearly definable or determinable coordinates. If necessary, other positions or a different coordinate system can also be used.
  • In the Cartesian coordinate system described above, a seat carrier extends substantially parallel to the bottom surface. The longitudinal extension S of a seat support is essentially the spatial extent in the direction of the chair user, ie oriented substantially along the x-direction. Substantially perpendicular to the longitudinal extension S of a seat carrier, the transverse extension is oriented, which extends substantially from the chair user from right to left, that extends substantially along the y-direction. A seating surface disposed on the seat supports extends substantially parallel to the floor surface. In particular, the seat surface essentially extends between two seat carriers, wherein the seat carriers can be arranged along the viewing direction of the chair user on the right and left edge region of the seat surface. Preferably, the seat is a stretchable or resilient covering between two seat supports.
  • The backrest extends in an upright position substantially perpendicular to the bottom surface and substantially parallel to a plane defined by the y and z directions. The longitudinal extent R of the backrest is essentially the spatial extension along the spine of the chair user, i. essentially along the z-direction, oriented. Substantially perpendicular to the longitudinal extent R of the backrest, the transverse extent of the backrest is oriented, which extends substantially from the chair user from right to left, that extends substantially along the y-direction.
  • The term "first position", as used in the context of the present invention, describes, for example, the state or the position of one or more components, in particular of the seat support and the backrest. The term "first position" particularly describes that position when the backrest is in an upright position. In other words, the first position corresponds to the position in which the chair is located when a user wishes to sit upright on it.
  • The term "second position" as used in the context of the present invention describes, for example, a state different from the aforementioned state or the aforementioned position or position of the aforementioned components, in particular the backrest. In contrast to the first position, in the second position, the backrest is inclined further to the rear, ie inclined in the opposite direction to the x-direction. The term "second position", as used in the context of the present invention, thus describes in particular a position with a maximum inclined backrest. For example, the second position can be achieved by applying a force against the x direction on the backrest. Due to the applied force, in particular, the backrest moves, for example, from the first to the second position. Here, the components, in particular the backrest, can be brought into any intermediate position between the first and the second position and preferably fixed in this intermediate position. Particularly preferably, the chair is designed to be resilient, ie it is designed so that it returns to the backrest substantially after the action of a force against the x-direction back to the first position.
  • Advantageously, no upwardly or downwardly directed movement relative to the seat surface takes place during the inclination movement of the backrest relative to the seat support. As a result, there is also no relative movement between the tilting backrest and the back of the chair user, which is why the leaning back of the backrest does not lead to a shift of individual outerwear pieces of the chair user relative to each other. Advantageously, therefore, the ease of use of a chair according to the invention over conventional chairs is increased.
  • Advantageously, the seat support is tiltable relative to the base support, wherein the tilt axis of the seat support coincides in particular substantially with the y-direction. Particularly preferably, the base support is arranged on a chair foot and in particular can not be tilted relative to the floor surface.
  • Particularly preferably, the chair may comprise two or more tension spring levers and three or more coupling levers, wherein in particular the tension spring lever and the coupling levers are respectively arranged on the right and left side of the seat support. This advantageously keeps the central space below the seat support free. In particular, the minimum distance or the height of the free space between the lower edge of the seat support and the upper edge of the base support is greater than about 1 cm, greater than about 2 cm, more preferably greater than about 5 cm and in particular greater than about 10 cm.
  • Furthermore, the tie rods are designed to absorb both tensile and compressive loads to actuate or displace the backrest by pulling or pushing in two directions. In particular, the tie rods are substantially rigid. Alternatively, the tie rods could also be referred to as push rods or pull / push rods. Particularly preferably, the chair may have three, four, five, six or more pull rods and three, four, five, six or more pull levers, wherein the pull rods and pull levers are respectively arranged on the right and left sides of the seat support. In particular, the tie rods can be arranged substantially along the longitudinal extension S of the seat support on the outer sides of the seat support or in Zugstangenkanälen so that the tie rods do not affect a closed contour of the seat support.
  • Preferred embodiments of the chair
  • Preferably, the upper sheet guide, the lower sheet guide and the backrest support are designed such that the backrest support and the backrest are movable exclusively along a circular path around the center of the circle H.
  • Advantageously, during the rotational movement of the backrest of the distance of individual areas of the backrest to the circle center H constant, ie there is no translational movement of the backrest or individual areas thereof in an outgoing from the circle center H radial direction, whereby the position of the pelvis of the chair user not from the backrest removed. Therefore, the pelvis and the vertebrae of the chair user are advantageously supported at different inclinations of the backrest. In particular, since the lower portion of the backrest is not substantially removed from the pelvis, a rotation of the pelvis to the rear is avoided. The consequence of a Pelvic rotation is a "hunchback" that particularly affects the intervertebral discs of the lumbar vertebrae. Consequently, this preferred embodiment of the chair is particularly back-friendly.
  • Preferably, the seat support and the backrest are designed such that the pivot point D of the hip joint of a user of the chair coincides approximately with the spatial position of the circle center point H. Preferably, the distance between H and D is less than about 5 cm, more preferably less than about 3 cm and especially less than 2 cm. Advantageously, in this case, all areas of the pelvis and the spine are supported in all inclination positions and during the tilting movement of the backrest.
  • Preferably, the distance between the bottom surface on which the chair is, and the front seat coupling axis in inclination of the backrest support and / or the seat support is variable or changeable. In particular, the front seat coupling axis is arranged on the coupling levers that changes the distance upon rotation of the coupling lever. Particularly preferably, the distance of the seat coupling axis is reduced to the bottom surface when the seat support or the seat and / or the backrest is tilted backwards.
  • Advantageously, thereby, the distance between the seat front edge and the bottom surface remains substantially constant, so that when reclining the chair user, the area of the lower thigh and the knee area is not raised substantially by the front seat. Advantageously, thereby a pressure on the lower thigh is avoided and the blood supply to the lower leg is not affected, so that the seating comfort is increased.
  • Preferably, the chair mechanism is formed substantially mirror-symmetrical to a plane in the xz-direction, which extends through the central axis of the Stuhifußes. In particular, the chair mechanism comprises the seat support, the at least one tension spring lever and the coupling lever. More preferably, the chair mechanism comprises the pull lever and the tie rods and in particular the backrest support. Advantageously, the mirror-symmetrical design of the chair mechanism leads to an increased torsional freedom of the individual components, since the acting forces are distributed symmetrically and torsional or torsional forces compensate each other to a first approximation. As a result, the entire chair mechanism is advantageously produced with less material consumption and a slimmer design is made possible.
  • Preferably, the at least two coupling levers each have a first coupling means which is designed to engage with a second coupling means of one of the at least two pull levers and / or to be connected to one another in a force-locking manner.
  • Preferably, the first coupling means is formed as a series of equidistant projections or as a row of equidistant recesses. In particular, the projections of the first coupling means are designed to engage in corresponding recesses of the second coupling means. Alternatively, the recesses of the first coupling means are designed so that projections of the second coupling means can engage in them.
  • Preferably, the first coupling means is formed as a row of teeth or as a circular arc portion of a gear. In particular, the second coupling means is formed in this case as a corresponding counter-tooth row or gear portion, so that in particular both coupling means are non-positively connected.
  • Preferably, the seat support is tiltable about a tilt axis so that a seat angle β of about 70 ° to about 110 ° degrees, more preferably from about 80 ° to about 100 ° degrees, is included between the z-direction and the longitudinal extent S of the seat carrier. More preferably, the seat angle β is in a range of about 85 degrees to about 95 degrees. In other words, the longitudinal extent S of the seat carrier extends substantially along the x-direction and is tilted to a limited extent with respect to the x-direction.
  • Preferably, the backrest is tiltable about a tilt axis, so that between the z-direction and the longitudinal extent R of the backrest a backrest angle γ is included from about 0 ° to about 55 ° degree. More preferably, the seat back angle γ is in a range of about 5 degrees to about 40 degrees.
  • Preferably, the changes in the seat angle Δβ and the changes in the backrest angle Δγ are in a constant relationship with each other, the ratio Δγ / Δβ being between about 2 and about 4. This means that the inclination of the backrest takes place together with the inclination of the seat support. For example, if the backrest is brought from a first position with a backrest angle of 5 degrees to a second position with a backrest angle of 35 degrees, Δγ is equal to 30 degrees. With an exemplary ratio Δγ / Δβ of 3, the changes in the seat angle Δβ are therefore 10 degrees. As a result, the thighs and the pelvic floor are also tilted back by 10 degrees and the opening angle α = β + γ between the seat support and the backrest is increased by 20 degrees. More preferably, the ratio Δγ / Δβ is between about 2.2 and about 3.7, between about 2.5 and about 3.5, between about 2.7 and about 3.3, and most preferably about 3.
  • The present invention is not limited to the above embodiments described by way of example.
  • figure description
  • Fig. 1
    shows a perspective view of the mechanics of a first embodiment of a chair.
    Fig. 2
    shows a side view of the mechanism of the embodiment of the chair in a first position.
    Fig. 3
    shows a side view of the mechanism of the first embodiment of the chair in a second position.
    Fig. 4
    shows a detailed side view of the mechanism according to Fig. 2 ,
    Fig. 5
    shows a detailed side view of the mechanism according to Fig. 3 ,
    Fig. 6
    shows a detailed side view of the mechanism of a second embodiment of the chair in a first position.
    Fig. 7
    shows a detail side view of the mechanism of the second embodiment of the chair in a second position.
  • FIG. 1 shows a perspective view of the mechanics of a first embodiment of a chair 1. The chair 1 comprises a chair foot 2, which is preferably adjustable in height, a base support 3, two seat support 4, two backrest support 5 and a backrest. 6
  • On the seat supports 4, two arranged on a rear seat coupling axis 18 Zugfederhebel 10 and on the other two arranged on a front seat coupling axis 22 coupling lever 20 are articulated in this embodiment on the one hand. The tension spring levers 10 are connected via the main axis 14 and the coupling lever 20 are pivotally connected via the base coupling axis 24 with the base support 3. Thus, the seat support 4 is connected to the base support 3, which in turn is connected to the chair base 2.
  • In the embodiment shown, the backrest supports 5 or the backrest 6 have or in particular have a stiffening element 7 in order to connect the two backrest supports with one another and to increase the dimensional stability of the backrest 6. The backrest 6 may preferably be integrally formed with the backrest supports 5 and in particular with the stiffening element 7.
  • Between an upper sheet guide 45 and a lower sheet guide 46, which are each arranged on a seat support 4, in each case a backrest support 5 is movably mounted. A pull rod 50 is hinged to one Backrest support 5 is arranged and hingedly connected to a pull lever 30. The two pull levers 30 are arranged on the main axis 14 and coupled to the coupling levers 20.
  • FIG. 2 shows a side view of the mechanism of the first embodiment of the chair 1 in a first position, as in FIG. 1 shown. In the first position, the chair mechanism is in such a position that a user can sit on the chair 1 in an upright sitting position.
  • The seat support 4 has a longitudinal extent S, which extends approximately parallel to the x-direction and substantially perpendicular to the z-direction and a second extension along the y-direction, so that a plane spanned by the upper edge of the seat support 4 in the plane extends substantially horizontally. The seat support 4 is tiltable about a tilting axis that runs along the y-direction, so that between the z-direction and the longitudinal extension S of the seat support 4, a seat angle β 1 is included, wherein the angle β 1 in the first position in the area from about 80 ° to about 110 ° degrees, in particular about 90 ° degrees.
  • The backrest 6 has a longitudinal extent R which extends approximately parallel to the z-direction and substantially perpendicular to the x-direction and a second extent along the y-direction so that a plane defined by the backrest 6 is substantially vertical extends. The backrest 6 is tiltable about a tilting axis or axis of rotation which runs along the y-direction. In particular, the backrest support 5 is at least partially guided by the upper and lower sheet guide 45, 46 circular. The common circle center H of the arc sections of the upper and lower sheet guide 45, 46 is arranged at a radius R H spaced from the upper sheet guide 45. The backrest 6 is thus rotatably mounted about the circle center H. In particular, there is no translational relative movement between the circle center H and the backrest 6.
  • Between the z direction and the longitudinal extent R of the backrest 6 is a seat back angle is γ 1 is enclosed in the first position, wherein the angle γ 1 in the first position in the range of about 0 ° to about 25 ° degrees, in particular about 6 degrees, is. Consequently, between the longitudinal extension R of the backrest 6 and the longitudinal extent S of the seat support 4, an opening angle α 1 is included, which in the first position in the range of about 80 ° to about 135 °, in particular about 96 ° degrees.
  • The minimum backrest angle γ 1 of less than 25 degrees is achieved when the pull rod 50 is in an extreme position opposite to the x direction, ie at the rear. In this position, the circle center H of the sheet guides 45, 46 of the seat support 4 is in a spatial position close to the z-axis of the chair foot 2. In particular, from the circle center H, the distance against the z-direction to the seat support 4 and the distance against the x Direction to the backrest 6 and the backrest support 5 in about the same size.
  • FIG. 3 shows a side view of the mechanism of the first embodiment of the chair 1 in a second position. In the second position, the chair mechanism is in such a position that a user can sit on the chair 1 in a reclined sitting position.
  • In the second position, the longitudinal extent S of the seat support 4 with the z-direction includes a seat angle β 2 of about 70 ° to about 90 ° degrees, in particular about 80 ° degrees.
  • The longitudinal extent R of the backrest 6 in the second position with the z-direction includes a backrest angle γ 2 of about 20 ° to about 55 °, in particular about 36 °, a.
  • Consequently, between the longitudinal extent R of the backrest 4 and the longitudinal extent S of the seat support 4 in the second position, an opening angle α 2 of about 100 ° to about 155 °, in particular about 116 ° degrees included.
  • The maximum backrest angle γ 2 is achieved when the pull rod 50 is in an extreme position in the x-direction, ie in front. In this position, the circle center H is in a spatial position, which is compared to the first position further against the x-direction of the z-axis of the chair foot second is removed. In particular, the distance from the z-direction to the seat support and the distance against the x-direction to the backrest 6 and the backrest support 5 in the second position is approximately the same size from the circle center H.
  • When the chair 1 moves from the first position to the second position, the changes in the seat angle Δβ = β 21 and the backrest angle Δγ = γ 21 are preferably in a constant relationship to one another. In this case, the ratio of the angle changes Δγ / Δβ is in particular between about 2 and about 4, more preferably between about 2.5 and about 3.5, and particularly preferably about 3.
  • Further, the circle center H shifts in the transition from the first to the second position opposite to the x-direction, so that its distance from the backrest 6 does not increase.
  • Preferably, the circle center H is arranged so that it coincides approximately with the spatial position of the pivot point D of the hip joint of a user of the chair 1. Preferably, the distance between H and D is less than about 5 cm, more preferably less than about 3 cm and especially less than 2 cm. Preferably, the radius R H of the upper sheet guide 45, ie the distance of the circle center H to the seat support or the backrest support, in a range of about 6 cm to about 20 cm, more preferably in a range of about 8 cm to about 18 cm, more preferably in a range of about 10 cm to about 15 cm, in particular in a range of about 11 cm to about 13 cm.
  • FIG. 4 shows a detailed side view of the mechanism of the first embodiment of the chair 1 in a first position, as in FIG. 2 shown.
  • The seat support 4 is connected on the one hand via two tension spring lever 10 and the other via two coupling lever 20 with the base support 3 articulated. Each Zugfederhebel 10 has at one end a Sitzkoppelachsenlagerbereich 11, at the opposite end of a Zugfederachsenlagerbereich 12 and intervening a Hauptachsenlagerbereich 13. Each Zugfederhebel 10 is mounted on the main axis bearing portion 13 mounted in the main axis 14 with the Base support 3 rotatably connected. Furthermore, the tension spring lever 10 is connected to the base support 3 via the tension spring axle 15 mounted in the tension spring axle bearing region 12, the tension spring 16 and the tension spring suspension 17. The Sitzkoppelachsenlagerbereich 11 of the tension spring lever 10 is pivotally connected to the seat support 4 via the seat coupling axis 18 and the rear seat coupling bearing 41.
  • Each coupling lever preferably has a substantially angular shape with two legs. The coupling lever 20 also has at one end of a leg on a Sitzkoppelachsenlagerbereich 21, with which it is articulated via the front seat coupling axis 22 and the front seat coupling bearing 42 with the seat support 4. Furthermore, the at least one coupling lever 20 has a base coupling axle bearing region 23, which receives the base coupling axle 24, so that the at least one coupling lever 20 is rotatably connected to the base support 3 via the base coupling axle 24.
  • At one end of the other leg, the at least one coupling lever 20 has a first coupling means 25, which is designed to engage with a second coupling means 35 of a pulling lever 30.
  • The at least one pull lever 30 preferably has an angular shape with two legs. The at least one pull lever 30 has at one end of a leg to a drawbar storage area 31, on which a pull rod 50 is pivotally connected to the pull lever 30. Further, the at least one pull lever 30 has a main axis bearing portion 33 which receives the main shaft 14, so that the pull lever 30 is rotatably connected to the base support 3 via the main shaft 14.
  • At one end of the other leg, the at least one pull lever 30 has the second coupling means 35, which is designed to engage with the first coupling means 25 of the at least one coupling lever 20.
  • In the first embodiment, the first coupling means 25 is formed as a series of equidistant projections or teeth or a circular arc portion of a gear. The second coupling agent 35 may be formed in the first embodiment as an opposite to the first coupling agent equidistant series of recess or as a tooth or row of teeth or also as a circular arc portion of a gear, wherein the first coupling means 25 is in engagement with the second coupling means 35.
  • By rotation of the at least one pull lever 30, the drawbar 50 connected thereto is movable substantially in or counter to the x-direction. The pull rod 50 is connected via an articulated connection 51 with the backrest 5.
  • The backrest support 5 has a positively guided region 52 with guided elements 53, which is movable within an upper sheet guide 45 and a lower sheet guide 46 of the seat support 4, in particular around the circle center H is rotatable. The guided elements 53 can be embodied in particular as rollers which are arranged on stub axles or axes which are arranged in the positively guided region 52. The rollers may be displaced, in particular, by rolling or sliding between the upper sheet guide 45 and the lower sheet guide 46. If the diameter of the rollers chosen smaller than the distance between the upper and lower sheet guide 45, 46, for example, by 1/10 to 1/2 millimeter, the displacement will be advantageously carried out substantially by rolling and thus be particularly frictionless.
  • In the first position, the tension spring 16 is contracted and relaxed with the at least one tie rod 50 in an extreme spatial position in the x direction and the seat support substantially horizontal, i. substantially parallel to the x-y plane.
  • FIG. 5 shows a detailed side view of the mechanism of the first embodiment of the chair 1 in a second position, as in FIG. 3 shown.
  • As can be seen from the figure, the continuous transition of the seat support 4 remains over the upper sheet guide 45 to the backrest support 5 in the transition from the first position Fig. 4 obtained in the second position. That is, by the Sheet guides 45, 46 a translational movement of the backrest support 5 and the backrest 6 along the direction of the radius vector R H is prevented. As a result, there is advantageously no discontinuity or an edge in the chair upholstery in the region of the transition between the seat support and the backrest, which would disadvantageously lead to a reduction of the sitting comfort.
  • Furthermore, based on the FIGS. 4 and 5 shown that the front edge 43 of the seat support 4 relative to the front seat coupling axis 22 in the z-direction, ie displaced upwards. In order to avoid raising the lower thigh or the knee of the chair user when leaning back, the front seat coupling shaft 22 is correspondingly displaced by the rotation of the coupling lever 20 counter to the z-direction, ie, down. Preferably, the position of the leading edge 43 of the seat carrier remains substantially constant, ie, it is displaced in magnitude along the z-direction less than about 2 cm, more preferably less than about 1 cm, and most preferably less than about 5 mm.
  • FIG. 6 shows a side view of the mechanism of a second embodiment of the chair 1 in a first position. The chair 1 is designed substantially in accordance with the first embodiment, as in particular FIG. 4 is shown. The to FIG. 4 corresponding parts are therefore provided with the same reference numerals.
  • In the second embodiment, the at least one coupling lever 20 has a preferred first coupling means 25 and the at least one pulling lever 30 a preferred second coupling means 35, wherein the coupling means 25, 35 which are adapted to engage each other.
  • In the second embodiment, the first coupling means 25 is formed as a pin 26 or stub axle 26. Preferably, the connecting line between the pin 26 and the base coupling axle bearing portion 23 and the connecting line between the seat coupling axle bearing portion 21 and the base coupling axle bearing portion 23 form an angle δ which is different from 180 degrees. More preferably, δ is between about 30 and about 150 degrees, and more preferably between about 80 and about 110 degrees.
  • The second coupling means 35 is formed in the first embodiment as a recess 36 in the pull lever 30, in which the pin 26 engages. The recess 36 is preferably elongated, in particular substantially rectangular, formed, so that the extension in the direction K of the short side of the recess 36 is approximately equal to the diameter of the pin 26. The recess 36 is arranged such that the direction L of the longitudinal extension, i. the extension in the direction of the long side, the recess 36 coincides with an emanating from the main axis 14 radius vector of the main axis 14. As a result, the pin 26 can be moved substantially only in or counter to the direction L of the longitudinal extension of the recess 36, ie radially away from the main axis 14 or towards it. Therefore, a force on the edge of the recess 36 in or against the direction K can be transmitted by the pin 26 or from the edge of the recess 36 on the pin 26. By acting on this force, the pull lever 30 is rotatable about the main axis 14, since this Force tangential, ie perpendicular to a radius vector, acts on the main axis 14 on the pull lever 30.
  • FIG. 7 shows a side view of the mechanism of a second embodiment of the chair 1 in a second position similar to that in the Figures 3 and 5 shown position. Also in the in the FIGS. 6 and 7 In the embodiment shown, when the backrest support 5 is tilted back, the seat coupling axle 22 is displaced counter to the z direction, ie, to prevent lifting of the lower thigh or the knee of the chair user by the front edge 43 of the seat support when leaning back.
  • The present description of the preferred embodiments is not limited to the respective figures described above. Rather, the comments on the respective figures apply mutatis mutandis to the other figures. Likewise, the statements made to the figures also apply to the preceding aspects and embodiments.
  • LIST OF REFERENCE NUMBERS
  • 1
    chair
    2
    chair foot
    3
    base support
    4
    seat support
    5
    Backrest support
    6
    backrest
    7
    stiffener
    10
    pull spring
    11
    Seat Köppel shaft bearing portion
    12
    Zugfederachsenlagerbereich
    13
    Main shaft bearing portion
    14
    main axis
    15
    Zugfederachse
    16
    mainspring
    17
    Zugfederaufhängung
    18
    rear seat coupling axle
    20
    coupling lever
    21
    Seat coupling shaft bearing region
    22
    front seat coupling axle
    23
    Base coupling shaft bearing region
    24
    Base coupling shaft
    25
    first coupling agent
    26
    spigot
    30
    pull lever
    31
    Zugstangenlagerbereich
    33
    Main shaft bearing portion
    35
    second coupling agent
    36
    recess
    41
    rear seated coupling bearing
    42
    front seated coupling bearing
    43
    Front edge of the seat support 4
    45
    upper bow guide
    46
    lower bow guide
    50
    pull bar
    51
    articulated connection
    52
    positively driven area
    53
    guided elements
    D
    Fulcrum of the hip joint
    H
    Circle center
    K
    Direction of the short side of the recess
    L
    Direction of the long side of the recess
    R
    Longitudinal extension of the backrest 6
    R H
    radius vector
    S
    Longitudinal extent of the seat support 4

Claims (11)

  1. Chair, in particular a rotatable office chair, comprising:
    - at least two seat carriers (4), each further comprising an upper arched guide (45) and a lower arched guide (46);
    - at least two back rest carriers (5), each further comprising a restrictedly guided region (52);
    - a back rest (6) arranged on the back rest carriers (5), wherein
    - the restrictedly guided region (52) of the back rest carriers (5) is respectively guided between the upper arched guide (45) and the lower arched guide (46) of the corresponding seat carriers (4), thus allowing the back rest carriers (5) to be inclined relative to the seat carriers (4), wherein
    - the upper arched guide (45) and the lower arched guide (46) are embodied at least in certain regions as an arc of a circle portion and wherein
    - the arc of a circle portion of the upper arched guide (45) and the arc of a circle portion of the lower arched guide (46) have the same centre of a circle H;
    - a base carrier (3); characterized by
    - at least one pull spring lever (10) which is articulated to the seat carrier (4) by means of a rear seat coupling shaft (18);
    - at least two coupling levers (20) which are articulated to the seat carrier (4) by means of a front seat coupling shaft (22), wherein
    - the at least one pull spring lever (10) is articulated to the base carrier (3) by means of a main shaft (14) and the at least two coupling levers (20) are articulated to the base carrier (3) by means of a base coupling shaft (24);
    - at least two pull rods (50) which are arranged in an articulated manner on the at least one back rest carrier (5) and
    - at least two pull levers (30) which are arranged on the main shaft (14) and which are each articulated to the at least two pull rods (50).
  2. Chair according to Claim 1, wherein the upper arched guide (45), the lower arched guide (46) and the back rest carrier (5) are designed in such a way that the back rest carrier (5) and the back rest (6) are movable exclusively along a circular path about the centre of the circle (H).
  3. Chair according to one of Claims 1 or 2, wherein the seat carrier (4) and the back rest (6) are designed in such a way that the pivot point (D) of the hip joint of a user of the chair (1) coincides substantially with the spatial position of the centre of the circle (H).
  4. Chair according to one of the preceding claims, wherein the distance between a floor area on which the chair (1) is standing and the front seat coupling shaft (22) is variable on inclination of the back rest carriers (5) and/or the seat carriers (4).
  5. Chair according to one of the preceding claims, wherein the chair mechanism is embodied substantially mirror-symmetrically to a plane in the x-z direction running through the centre axis of the chair foot (2).
  6. Chair according to one of the preceding claims, wherein the at least two coupling levers (20) each have a first coupling means (25) which is designed to enter into an engagement with a second coupling means (35) of one of the at least two pull levers (30).
  7. Chair according to Claim 6, wherein the first coupling means (25) is embodied as a series of equidistant projections or as a series of equidistant recesses.
  8. Chair according to Claim 6, wherein the first coupling means (25) is embodied as a row of teeth or as an arc of a circle portion of a gear wheel.
  9. Chair according to one of the preceding claims, wherein the seat carrier (4) can be inclined about a tilt axis, so that a seat angle (β) of from approximately 70 to approximately 110 degrees is enclosed between the z direction and the longitudinal extension (S) of the seat carrier (4).
  10. Chair according to one of the preceding claims, wherein the back rest (6) can be inclined about a tilt axis, so that a back rest angle (γ) of from approximately 0 to approximately 55 degrees is enclosed between the z direction and the longitudinal extension (R) of the back rest (6).
  11. Chair according to Claim 10, wherein the changes in the seat angle (Δβ = β2 - β1) and the changes in the back rest angle (Δγ = γ2 - γ1) are at a constant ratio to one another, wherein the ratio Δγ/Δβ is between approximately 2 and approximately 4.
EP20090000354 2008-02-27 2009-01-13 Office chair Expired - Fee Related EP2095741B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200810011309 DE102008011309B3 (en) 2008-02-27 2008-02-27 Office chair

Publications (2)

Publication Number Publication Date
EP2095741A1 EP2095741A1 (en) 2009-09-02
EP2095741B1 true EP2095741B1 (en) 2010-10-27

Family

ID=40481872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090000354 Expired - Fee Related EP2095741B1 (en) 2008-02-27 2009-01-13 Office chair

Country Status (7)

Country Link
US (1) US8070230B2 (en)
EP (1) EP2095741B1 (en)
JP (1) JP2009201988A (en)
AT (1) AT485742T (en)
CA (1) CA2648254A1 (en)
DE (2) DE102008011309B3 (en)
DK (1) DK2095741T3 (en)

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US9004597B2 (en) 2012-09-20 2015-04-14 Steelcase Inc. Chair back mechanism and control assembly

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DE102008011309B3 (en) 2008-02-27 2009-06-04 Thonet Gmbh Office chair
US9706845B2 (en) 2012-09-20 2017-07-18 Steelcase Inc. Chair assembly
US9604553B2 (en) * 2012-12-11 2017-03-28 Ford Global Technologies, Llc Virtual H-point seat back system
DE202015007195U1 (en) 2014-10-20 2015-11-23 Kinema Gmbh Seating and support furniture
DE102014015415B3 (en) * 2014-10-20 2015-11-19 Kinema Gmbh Seating and support furniture
DE202014008314U1 (en) * 2014-10-20 2014-10-28 Kinema Gmbh Seating and support furniture
USD777494S1 (en) 2015-05-22 2017-01-31 Davis Furniture Industries, Inc. Chair frame
US9713381B2 (en) * 2015-06-11 2017-07-25 Davis Furniture Industries, Inc. Chair
DE102015111946A1 (en) * 2015-07-22 2017-01-26 Bock 1 Gmbh & Co. Kg Mechanics for an office chair
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US10667969B2 (en) 2018-01-16 2020-06-02 Kinetic Innovative Seating System Llc Ergonomically designed seating apparatus
US10485346B2 (en) * 2018-01-22 2019-11-26 Knoll, Inc. Chair tilt mechanism

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Publication number Priority date Publication date Assignee Title
US9004597B2 (en) 2012-09-20 2015-04-14 Steelcase Inc. Chair back mechanism and control assembly
US9010859B2 (en) 2012-09-20 2015-04-21 Steelcase Inc. Chair assembly
US9022476B2 (en) 2012-09-20 2015-05-05 Steelcase Inc. Control assembly for chair
US9027997B2 (en) 2012-09-20 2015-05-12 Steelcasel Inc. Chair assembly
US9027998B2 (en) 2012-09-20 2015-05-12 Steelcase Inc. Chair assembly
US9027999B2 (en) 2012-09-20 2015-05-12 Steelcase Inc. Control assembly for chair
US9049935B2 (en) 2012-09-20 2015-06-09 Steelcase Inc. Control assembly for chair
USD742677S1 (en) 2012-09-20 2015-11-10 Steelcase Inc. Chair
USD742676S1 (en) 2012-09-20 2015-11-10 Steelcase Inc. Chair
US9345328B2 (en) 2012-09-20 2016-05-24 Steelcase Inc. Chair assembly with upholstery covering
US9451826B2 (en) 2012-09-20 2016-09-27 Steelcase Inc. Chair assembly
US9462888B2 (en) 2012-09-20 2016-10-11 Steelcase Inc. Control assembly for chair
US9492013B2 (en) 2012-09-20 2016-11-15 Steelcase Inc. Chair back mechanism and control assembly

Also Published As

Publication number Publication date
EP2095741A1 (en) 2009-09-02
DE102008011309B3 (en) 2009-06-04
JP2009201988A (en) 2009-09-10
US20090212617A1 (en) 2009-08-27
DK2095741T3 (en) 2011-01-31
AT485742T (en) 2010-11-15
DE502009000143D1 (en) 2010-12-09
CA2648254A1 (en) 2009-08-27
US8070230B2 (en) 2011-12-06

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