EP3973820A1 - Mécanisme pour une chaise - Google Patents

Mécanisme pour une chaise Download PDF

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Publication number
EP3973820A1
EP3973820A1 EP21020469.9A EP21020469A EP3973820A1 EP 3973820 A1 EP3973820 A1 EP 3973820A1 EP 21020469 A EP21020469 A EP 21020469A EP 3973820 A1 EP3973820 A1 EP 3973820A1
Authority
EP
European Patent Office
Prior art keywords
spring
backrest
support element
backrest support
seat
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.)
Pending
Application number
EP21020469.9A
Other languages
German (de)
English (en)
Inventor
Hermann Bock
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.)
Bock 1 GmbH and Co KG
Original Assignee
Bock 1 GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bock 1 GmbH and Co KG filed Critical Bock 1 GmbH and Co KG
Publication of EP3973820A1 publication Critical patent/EP3973820A1/fr
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • 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
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/025—Springs not otherwise provided for in A47C7/22 - A47C7/35
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272—Reclining 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
    • 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
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back

Definitions

  • the invention relates to a mechanism for a chair, in particular for an office chair.
  • the invention relates to a chair with such a chair mechanism.
  • Mechanisms for office chairs include Synchronous mechanisms, asynchronous mechanisms and rocking mechanisms are known.
  • the term synchronous mechanism is understood to mean assemblies in the seat substructure of an office chair that ensure kinematics that are coupled to one another and bring about a specific relative movement of the seat and backrest to one another.
  • the seat of the office chair which is usually provided with an upholstered seat, is mounted on the seat support.
  • the backrest support which extends backwards in the usual way from the actual synchronous mechanism, carries the backrest of the office chair on an outrigger that runs upwards.
  • Seat support and backrest support are usually articulated in such a way that a pivoting movement of the backrest backwards - as can be caused, for example, by the chair user leaning against the backrest - induces a lowering movement of the rear edge of the seat downwards. This prevents the so-called "shirt pull-off effect" and increases seating comfort.
  • asynchronous mechanism means such assemblies in which a pivoting of the backrest does not cause any movement of the seat support. In other words, only the moves when pivoting backwards Backrest.
  • the seating comfort is reduced in comparison to synchronous mechanisms.
  • the so-called “shirt-pulling effect” can occur due to the "diverging" of the movements of the backrest and seat.
  • such assemblies are significantly cheaper to produce than the synchronous mechanisms described above.
  • Rocker mechanisms are comparably simple assemblies in the seat substructure of chairs, in which the backrest support is more or less rigidly connected to the seat support, the seat or the frame of the chair.
  • the resulting combination of seat support and backrest support can be pivoted backwards by means of the rocking mechanism about a pivot axis running transversely to the longitudinal direction of the chair when the user of the chair leans against the backrest.
  • Rocker mechanisms of this type are often used instead of synchronous mechanisms in inexpensive visitor or conference chairs in order to implement a simple rocker function there. Because of their comparatively simple structure, seesaw mechanisms are usually significantly cheaper to produce than the mechanisms described above.
  • the seat support includes a first Seat support element and a second seat support element, wherein the second seat support element is movable relative to the first seat support element transversely to the longitudinal direction of the chair, and/or the backrest support comprises a first backrest support element and a second backrest support element, wherein the second backrest support element rotates relative to the first backrest support element about an axis of rotation lying in the longitudinal direction of the chair is rotatable.
  • One object of the present invention is to specify a structurally simple solution for loading an office chair component, in particular a backrest support, with the aid of a spring device.
  • This solution should preferably also ensure a particularly reliable operation of the spring device and it should preferably be able to be implemented in a particularly small space.
  • the chair mechanism comprises a base support which can be placed on a chair column, a seat support which is arranged on the base support and a backrest support which is connected to the seat support and/or to the base support and is designed for connection to a backrest, the backrest support comprising a first backrest support element and a second backrest support element.
  • the second backrest support element is rotatable relative to the first backrest support element about an axis of rotation lying in the longitudinal direction of the chair, and is characterized in that the backrest support has at least one spring element.
  • a two-part backrest support which includes at least one spring element for its loading itself, allows a structurally particularly simple construction of the chair mechanism, since the spring device is implemented within the backrest support itself and connections of spring elements with other components or assemblies of the chair mechanism are not required. This omission of additional connecting elements alone enables implementation in the smallest possible space.
  • the at least one spring element is used to the second to keep backrest support element in its non-inclined basic position in position to the first backrest support element and to support or to bring about a return of the second backrest support element in its basic position in the inclined state.
  • the at least one spring element is fully integrated into the backrest support, in particular in such a way that the spring element is completely surrounded by the backrest support.
  • the at least one spring element acts exclusively on parts of the backrest support, in particular on the first backrest support element on the one hand and on the second backrest support element on the other.
  • the spring element acts only between parts of the backrest support. It does not attack other components of the mechanics. This results in a particularly reliable functioning of the spring device.
  • the first back support element has at least one first spring mount and the second backrest support element has at least one second spring mount, the two spring mounts together forming a spring receiving space in which the at least one spring element lies.
  • the spring element preferably lies completely in this spring receiving space, in particular in such a way that the spring element is completely surrounded by the walls or other boundaries of the spring receiving space. The fact that the spring element rests completely in the spring receiving space prevents accidental loss of the spring element and makes it particularly safe Actuation of the backrest support guaranteed with the spring element.
  • the volume of the formed spring receiving space available for accommodating the at least one spring element can be changed by rotating the second backrest support element relative to the first backrest support element about the axis of rotation.
  • this volume of the spring receiving space can be reduced by such a rotation, as a result of which the spring element lying in the spring receiving space is acted upon.
  • the at least one spring element is acted upon on both sides each time the second backrest support element is rotated about the axis of rotation, namely both by the first backrest support element and by the second backrest support element.
  • both backrest support elements always grip the spring element simultaneously, regardless of the direction of rotation of the backrest support elements relative to one another. This preferably takes place at both ends or on opposite sides of the spring element.
  • the at least one spring element is preferably acted upon each time the second backrest support element is rotated about the axis of rotation both by a limitation of one spring receptacle and by the limitation of the other spring receptacle.
  • the at least one spring element is a compression spring, in particular a helical compression spring, the spring ends of which strike against the boundaries of the spring receiving spaces via spring plates.
  • the spring element does not hit directly and directly, but only via its spring plates on the boundaries of the spring receiving space.
  • helical springs other preferably cylindrical or cuboid spring elements can also be used for insertion in the spring receiving spaces, for example spring elements made of rubber or another suitable elastic plastic material.
  • the at least one spring element fills the spring receiving space essentially completely.
  • the shape and/or size of the at least one spring element is adapted to the shape and/or size of the spring receiving space in such a way that the spring element rests in the spring receiving space without pretension.
  • the shape and/or size can be selected in such a way that the spring element is oversized so that it can only be inserted into the spring receiving space under pretension, i.e. compressed. Accordingly, the tilting characteristic of the backrest, which is influenced by the mode of action of the spring element, can be adjusted in a simple manner.
  • the design of the mechanism according to the invention allows the at least one spring receiving space to be provided in different horizontal and/or vertical positions in the backrest support, including to the right and/or left of the axis of rotation of the backrest support elements or above, below or at the level of this axis of rotation.
  • the number of spring receiving spaces provided and used can also vary.
  • At least two spring receiving spaces are provided for receiving spring elements. These are preferably arranged symmetrically to the axis of rotation. It is true that the use of a single spring element, which rests in a spring receiving space on only one side of the axis of rotation, can be sufficient to achieve the desired functionality. However, if two spring elements are used, smaller spring elements can be used, so that the dimensions of the spring receiving spaces can also be smaller. In this way, the space required can be minimized and chair mechanisms in which a lateral inclination of the backrest is provided can be designed to be small and flat.
  • a chair mechanism is created in which the loading of an office chair component, in particular the backrest support, is possible in a structurally simple and at the same time safe manner.
  • the spring device is integrated in the backrest support and the function of the spring device does not require interaction of the backrest support with other components of the chair mechanism, the backrest support provided with the spring device according to the invention can not only work together with different seat supports and base supports, provided these are Are designed to interact with the backrest support according to the invention, but any backrests can also be attached to the backrest support without this having any influence on the spring force-influenced movement characteristics of the chair back.
  • the backrest support is coupled to the seat support in such a way that pivoting of the backrest support causes the seat support to move in the longitudinal direction of the chair relative to the base support.
  • the invention can be used very particularly advantageously in a mechanism in which—in addition to a two-part backrest support—a two-part seat support is also provided.
  • the desired transverse movement of the seat support is then preferably transmitted to the backrest support by suitable means, or vice versa.
  • the seat support preferably comprises a first seat support element and a second seat support element, with the second seat support element being movable relative to the first seat support element transversely to the longitudinal direction of the chair, in particular in such a way that when the second seat support element moves relative to the first seat support element, one of the seat supported by the second seat support element, seen in the longitudinal direction of the chair, inclines laterally.
  • the mechanism is designed in such a way that the inclination of the backrest differs from the inclination of the seat.
  • the second backrest support element is preferably connected to the second seat support element in that a connecting arm of the second backrest support element engages in a receiving opening of the second seat support element.
  • the movement of the second seat support element relative to the first seat support element is independent of the movement of the seat support caused by the backrest support.
  • the movements of the individual mechanical components can be carried out independently of one another.
  • the movement behavior of the chair to movements of the user is improved.
  • FIG. 1 to 15 illustrate the functional principle of an exemplary office chair mechanism in which the invention can be used.
  • FIG. 16 to 24 structural details of the solution according to the invention are illustrated by way of example.
  • FIG. 1 shows a mechanism 1 for an office chair in a side view in the non-pivoted and non-tilted state.
  • 2 shows the mechanism 1 1 in a cross section along line II-II.
  • 3 shows the mechanism 1 2 with a laterally inclined seat support element.
  • the mechanism 1 has a base support 2 which is placed on the upper end of a chair column (not shown) by means of a cone mount 3 .
  • the mechanism 1 comprises a seat support 4 which is arranged on the base support 2 and can be moved forwards and backwards relative to the fixed base support 2 in the longitudinal direction 8 of the chair.
  • the seat (not shown) of the office chair which is usually provided with a padded seat, is mounted on the seat support 4 .
  • the seat support 4 comprises a first seat support member 6 and a second seat support member 7, wherein the second seat support member 7 relative to the first seat support member 6 transversely to Chair longitudinal direction 8, ie to the right and left, is movable.
  • the first seat support element 6 is the seat support base attached separately from the actual seat, an element of the seat support 4 which interacts with the base support 2 .
  • the second seat support element 7 is the seat mounting element, which either includes the seat with the seat surface or--for example designed as a mounting plate--provides the necessary prerequisites for mounting the seat.
  • the mechanism 1 also includes a backrest support 5 which is connected to the seat support 4 and the base support 2 .
  • the backrest (not shown) of the office chair which is generally provided with a padded leaning surface, is connected to the backrest support 5 .
  • the backrest support 5 comprises a first backrest support element 9 and a second backrest support element 11, the second backrest support element 11 being rotatable (inclinable) relative to the first backrest support element 8 about an axis of rotation 12 (tilt axis) lying in the longitudinal direction 8 of the chair.
  • the first backrest support element 9 is the backrest support base, an element of the backrest support 5 which interacts with the base support.
  • the second backrest support element 11 is the backrest assembly element, which either includes the backrest with a leaning surface or - for example designed as an assembly adapter - offers the necessary prerequisites for a backrest assembly.
  • the backrest support 5 is seen with both the chair longitudinal direction 8 rear end 13 of the first seat support member 6 as also pivotably connected to the rear end 14 of the base support 2 about rear pivot axes 15, 16 running transversely to the longitudinal direction 8 of the chair, the connection area of the backrest support 5 between these two pivot axes 15, 16 serving as a rear coupling element 17 between the base support 2 and the seat support 4.
  • a front coupling element 18 is pivotally connected to the front end 21 of the base support 2 viewed in the longitudinal direction 8 of the chair and to the front end 19 of the first seat support element 6 about front pivot axes 22, 23 running transversely to the longitudinal direction 8 of the seat.
  • the manner in which the pivotable backrest support 5 is coupled to the first seat support element 6 and/or the base support 2 is irrelevant to the present invention. It can be a direct or an indirect coupling. The same applies to the articulation of the backrest support 5 to the base support 2 and the seat support 4 and thus the specific configuration of the synchronous movement between the backrest and the seat.
  • the mechanism 1 is relative to the central longitudinal plane 25 (see 2 ), as far as the actual kinematics are concerned, mirror-symmetrical. In that regard, in this description is always of both sides existing in pairs of construction elements Mechanic 1 to go out. In the 2 and 3 parts of the mechanism 1, in particular parts of the base support 2, are not shown for reasons of clarity.
  • the terms “pivoting movement, pivoting, pivoting axis” etc. refer to the movement of the backrest support 5 and the seat support 4 about axes of rotation 15, 16, 22, 23 running transversely to the longitudinal direction 8 of the chair when the backrest support 5 is pivoted.
  • the terms “tilting movement, tend “Tilt axis” etc. refer to the movement of the second seat support element 7 or the second backrest support element 11 about rotation axes 12, 33, 34, 35, 36 running in the longitudinal direction 8 of the chair, wherein the tilting movement can include a rotary and a translatory component.
  • tilt refers to the rotational portion of the tilt movement.
  • the longitudinal direction 8 of the chair extends from the front of the chair 26 in the direction of the back of the chair 27.
  • the two seat support elements 6, 7 are arranged one above the other, in particular in such a way that the second seat support element 7 is arranged on the first seat support element 6 or is arranged above the first seat support element 6 or is supported by the first seat support element 6.
  • the transverse movement system according to the invention can be used with an already existing chair mechanism without major structural adjustments.
  • a second seat support element 7 can be placed on an existing mechanical component as an additional component, with the seat support of the conventional mechanism forming the first seat support component 6 of the mechanism 1 according to the invention.
  • the first seat support element 6 can be designed as a mechanical component which is articulated in a proven manner via axes 22, 15 running transversely to the longitudinal direction 8 of the chair on the base support 2 or the backrest support 5.
  • the first seat support element 6 can also be designed as a seat carriage that can be displaced in the longitudinal direction 8 of the chair; in this case it can be suitable for seat depth adjustment, for example.
  • the second seat support element 7 can be moved relative to the first seat support element 6 on a trajectory 28 which lies in a plane 29 transverse to the longitudinal direction 8 of the chair, with this plane 29 preferably being a vertical plane ( please refer 1 ) acts.
  • this plane 29 can also lie at an angle to the vertical.
  • the seat supported by the second seat support element 7 inclines laterally, viewed in the longitudinal direction 8 of the chair.
  • the specific design of the seat is irrelevant for the invention.
  • the tilting movement of the second seat support element 7 preferably includes a translation and a rotation.
  • a sideways movement ie a movement of the second seat support element 7 transversely to the longitudinal direction 8 of the chair, is combined with a tilting or tilting movement of the second seat support element 7 relative to the first seat support element 6 .
  • the second seat support element 7 is connected to the first seat support element 6 via at least one link arrangement.
  • Each link 31, 32 is articulated on the first seat support element 6 such that it can rotate about a first axis of rotation 33, 35 and on the second seat support element 7 so that it can rotate about a second axis of rotation 34, 36, with all axes of rotation 33, 34, 35, 36 being parallel to one another lie and run in the longitudinal direction 8 of the chair.
  • all axes of rotation 33, 34, 35, 36 run below the seat surface of the seat.
  • the two seat support elements 6, 7 are connected to one another with the formation of a four-bar mechanism, with a virtual pivot point 37 (instantaneous pole) resulting for the second seat support element 7 as the intersection of the two straight lines running through the links 31, 32 (more precisely their pivot points). Due to the length of the links 31, 32 and/or the position of the pivot points or axes of rotation 33, 34, 35, 36 on the first and second seat support element 6, 7, the distance between the instantaneous center 37 and the seat support 4 can vary depending on the desired movement/tilt dynamics of the seat can be defined.
  • the links 31, 32 are designed as plate-shaped coupling elements, with the swivel joints for coupling to the first and second seat support element 6, 7 being provided on the lower and upper side edges of the links 31, 32, so that the axes of rotation 33, 43 , 35, 36 run parallel to the longitudinal direction of the links 31, 32.
  • the number of links 31, 32 on each side of the central longitudinal plane 25 can also be larger. Depending on the structural design, it is possible, for example, for two or three links per side to be provided instead of a single link 31, 32 per side.
  • the instantaneous pole 37 is preferably located below the seat support 4, more precisely below the seat surface of the seat.
  • the instantaneous center 37 of the seat support 4 is always so far away from the seat support 4 when the second seat support element 7 moves transversely to the longitudinal direction 8 of the chair that the translation components of the movement are greater than the rotational components.
  • the instantaneous center 37 is also preferably located far enough away from the seat support 4 that the translational component of the movement of the second seat support member 7 is greater than the rotational/tilting component of the movement.
  • the second seat support element 7 does not move on an extremely curved or steep trajectory, but instead on a rather flat trajectory. This benefits increased seating comfort.
  • the instantaneous center 37 is preferably located near the floor, ie in the vicinity of the chair support (not shown) provided at the lower end of the chair column.
  • the instantaneous center 37 moves, as in the 2 and 3 illustrated, with an inclination of the seat support 4 when using the link arrangement 31, 32 (four-bar mechanism) also on a trajectory 38 (see 3 ) and is not fixed. This is perceived as particularly pleasant for the movement dynamics.
  • the pivot points of the two links 31, 32 defined by the position of the axes 33, 34, 35, 36 (viewed in the longitudinal direction 8 of the chair) form a symmetrical, in particular isosceles, trapezium in the non-deflected state.
  • the two links 31, 32 more precisely the connecting lines 41, 42 between the upper and lower pivot points (axle positions), the trapezoidal legs, form the Connecting line 44 between the upper pivot points, the upper trapezoidal base and connecting line 43 between the lower pivot points, the lower trapezoidal base.
  • the upper base side of the trapezium is longer than the lower base side.
  • the distance between the lower axes, i.e. the axes 33, 35 of the joints connecting the links 31, 32 to the first (lower) seat support element 6, is less than the distance between the upper axes, i.e. the axes 34, 36 of the joints of the Connection of the links 31, 32 with the second (upper) seat support element 7. For this reason, it is an unstable system that tends to tilt.
  • spring elements (not shown) are therefore provided which, acting at suitable points, hold the second seat support element 7 in position relative to the first seat support element 6 in the non-tilted basic state and, in the tilted state, support or restore the second seat support element 7 to its basic position .
  • spring elements are provided which are connected on the one hand to the first seat support element 6 and on the other hand to the second seat support element 7 or to the links 31, 32 in order to hold the second seat support element 7 in its basic position, which is not inclined to the right or left.
  • first and the second seat support element 6, 7 are two separate components which are mechanically connected to one another, for example via the described coupling elements (link 31, 32).
  • at least one elastic coupling element can be arranged as a third component between the first and the second seat support element 6, 7, for example in the form of a cuboid or cylindrical buffer element, which ensures the required mobility of the two seat support elements 6, 7 relative to one another.
  • the buffer element is constructed, for example, in such a way that a rubber-elastic material is arranged between a base plate and a cover plate.
  • Such or similar buffer elements can also be provided between the mutually movable mechanical components 6, 7, etc. as stop elements for movement limitation.
  • a one-piece design of the two seat support elements 6, 7 is also possible, preferably using a suitable, flexible or elastic connecting material that allows a transverse movement and/or inclination of the second Seat support element 7 relative to the first seat support element 6 allowed.
  • a suitable, flexible or elastic connecting material that allows a transverse movement and/or inclination of the second Seat support element 7 relative to the first seat support element 6 allowed.
  • Such a variant can be produced particularly advantageously, for example using a multi-component injection molding process with various suitable plastics.
  • the mechanical components are preferably designed to be resilient, i.e. designed in particular to return the moved or deflected element to the basic position.
  • the otherwise necessary spring elements for raising the second seat support element 7 or for maintaining the state of equilibrium of the second seat support element 7 in the unoccupied state can then be omitted.
  • Mechanism 1 illustrated includes the movement of the second backrest support element 11 exclusively a rotation.
  • the central axis of rotation 12 (tilt axis) required for the rotation of the backrest support element 11 preferably runs below the seat surface of the seat.
  • the axis of rotation 12 of the backrest support 5 runs in the longitudinal direction 8 of the chair and parallel to the axes of rotation 33, 34, 35, 36 of the link arrangement 31, 32, and thus perpendicular to the axes of rotation 15, 16, 22, 23 of the base support 2, seat support 4 and backrest support 5.
  • the axis of rotation 12 is arranged in the vertical direction between the first axes of rotation 33, 35 of the links 31, 32 and the second axes of rotation 34, 36 of the links 31, 32.
  • the first and the second backrest support element 9, 11 are preferably designed as two separate components which are mechanically connected to one another, e.g. via a joint-side connection with a rotational degree of freedom.
  • a one-piece design of the two backrest support elements 9, 11 is also possible, preferably using a suitable, flexible or elastic connecting material that allows the second backrest support element 11 to rotate about the axis of rotation 12.
  • the second backrest support element 11 is preferably designed as a central support arm, which extends away from the chair mechanism 1 in the center towards the rear.
  • the second backrest support element 11 is designed as part of a frame 50 for the backrest, for example as a central connecting element between the backrest support 5 and a lower cross brace of the frame 50.
  • the second backrest support element 11 is preferably coupled to the second seat support element 7 in such a way that a movement of the second seat support element 7 relative to the first seat support element 6 causes a movement of the second backrest support element 11 relative to the first backrest support element 9, more precisely an inclination of the second Backrest support element 11 to the right or left causes (or vice versa).
  • an advantageous combination of the two tilting movements takes place. Not only the seat tilts (to the right or left), but also the backrest. A fixed backrest would be less comfortable with a reclined seat.
  • the lateral inclination of the seat or the backrest (without pivoting the seat support 4 backwards through the backrest support 5) is in the 3 , 6 , 10 , 14 shown.
  • the tilting movement of the backrest support 5, more precisely the tilting movement of the second backrest support element 11 and thus the backrest, is induced solely and exclusively by the articulation of the second backrest support element 11 on the second seat support element 7.
  • the backrest supported by the second backrest support element 11 is inclined laterally.
  • the specific design of the backrest is irrelevant for the invention.
  • the second backrest support element 11 is connected to the second seat support element 7 in that a connecting arm 48 of the second backrest support element 11 engages with its free end 49 in a receiving opening 51 in the second seat support element 7 or lies in such a receiving opening 51.
  • the force is introduced or the torque is transmitted from the second seat support element 7 to the second backrest support element 11 exclusively via the connecting arm 48.
  • the connecting arm 48 is preferably non-rotatable, i.e. the free end 49 lies rotatably in the receiving opening 51.
  • the free end 49 can be displaced both axially, i.e. in the longitudinal direction 8 of the chair, and vertically in the receiving opening 51, so that the connecting arm 48 - corresponding to the combined translational/rotational movement of the second seat support element 7 - moves on the defined trajectory 28 relative to the first seat support element 6 - can move with limited degrees of freedom in such a way that it effects a (pure) rotational movement of the second backrest support element 11 about its axis of rotation 12 relative to the first backrest support element 9 .
  • This coupling is implemented, for example, by a sliding block 52 or the like attached to the free end 49 of the connecting arm 48, which rests in the slotted link or receiving opening 51 of the second seat support element 7 (there lying against the vertical side surfaces of the slot).
  • the movement of the connecting link and thus the movement of the second seat support element 7 is transmitted to the positively guided sliding block 52 , the rotational degree of freedom being realized by a suitable rotary connection of the sliding block 52 with the connecting arm 48 .
  • the backrest support 5 is divided in two in such a way that the first backrest support element 9, like the front part of the backrest support 5 seen in the longitudinal direction 8 of the chair, connects the backrest to the base support 2 and the first seat support element 6, while the second backrest support element 11, which extends in the longitudinal direction of the chair 8 seen rearwardly adjoins the first backrest support element 9, the transition to the Backrest forms, but at the same time is coupled to the second seat support element 7.
  • the second seat support element 7 is connected or coupled to the second backrest support element 11 via a number of links (not shown) which are articulated to the second seat support element 7 and the second backrest support element 11 and are preferably designed like the links between the two seat support elements 6, 7 in the manner of a four-bar mechanism, or via other coupling elements.
  • the second seat support element 7 is connected or coupled to the second backrest support element 11 via a one-piece design of seat support element 7 and backrest support element 11 using a suitable, flexible or elastic material.
  • a variant has proven particularly advantageous in which the inclination of the backrest or the second backrest support element 11 is different from the inclination of the seat or the second seat support element 7 .
  • the invention it is not only possible to realize only a tilting movement of the second seat support element 7 to the right or left, without this leading to a subsequent movement of the backrest support 5; for this purpose, only the coupling of the backrest support 5 to the second seat support element 7 has to be omitted.
  • the tilting movements of the elements involved can also deviate from one another.
  • the inclination of the second backrest support element 11 and thus of the backrest corresponds to the inclination of the second seat support element 7 and thus of the seat.
  • the backrest moves in a different relationship to the reclined seat, ie the two recline angles are unequal.
  • An unequal pitch has turned out to be particularly user-friendly, especially when an inclination of the second seat support element 7 by a specific angle of inclination is followed by an inclination of the second backrest support element 11 by a greater angle of inclination, as in FIGS 6 , 10 and 14 shown.
  • the position of the axis of rotation 12 of the backrest support 5 is preferably below the connection point of the free end 49 of the connecting arm 48 with the seat support 4, i.e. below the point at which the sliding block 52 rests in the receiving opening 51.
  • the backrest inclines in the same direction as the seat.
  • the backrest can be tilted in the opposite direction (pivoting in the opposite direction) by inverting these two points relative to one another.
  • the desired tilting ratio between the seat and the backrest can thus be set , in particular through the structural arrangement of the position of the axes 33, 34, 35, 36, through the defined setting of the distances between the axes 33, 34, 35, 36 and/or through the arrangement of the real and virtual pivot points 37 of the components involved chair mechanism 1.
  • a variant of the invention is considered to be particularly advantageous, in which the backrest support 5, more precisely the first backrest support element 9, with the seat support 4, more precisely with the first seat support element 6, is coupled in such a way that pivoting the backrest support 5 in the longitudinal direction 8 of the chair causes a movement of the seat support 4 in the longitudinal direction 8 of the chair about a pivot axis running transversely to the longitudinal direction 8 of the chair relative to the base support 2 ("synchronous mechanism").
  • the chair mechanism 1 provided with the invention can also have other types of mechanisms, such as asynchronous mechanisms, rocking mechanisms or mixed types.
  • the (tilting) movement of the second seat support element 7 relative to the first seat support element 6 is independent of any other movement of the seat support 4 in the longitudinal direction 8 of the chair, in particular independent of the (pivoting) movement of the seat support 4 caused by the backrest support 5
  • the entire seat support 4 is carried along when the backrest support 5 is pivoted backwards and a tilting movement of the second seat support element 7 to the right and left can be carried out in the non-pivoted state of the mechanism 1 or also in addition to a pivoting of the backrest take place.
  • Figures 4 to 15 This is illustrated by way of example in Figures 4 to 15 .
  • Figures 4 to 7 the mechanism in a side view, namely in the starting position ( 4 ), pivoted backwards ( figure 5 ), with laterally inclined seat and backrest ( 6 ) and in both a tilted and pivoted position ( 7 ).
  • Figures 8 to 11 the mechanics from the front, viz in the starting position ( 8 ), pivoted backwards ( 9 ), with laterally inclined seat and backrest ( 10 ) and in both a tilted and pivoted position ( 11 ) .
  • Figures 12 to 15 the mechanism from behind, namely in the starting position ( 12 ), pivoted backwards ( 13 ), with laterally inclined seat and backrest ( 14 ) and in both a tilted and pivoted position ( 15 ) .
  • the number of degrees of freedom is increased with the invention by additional degrees of freedom being provided for the seat support 4 and optionally also for the backrest support 5 .
  • the movement behavior of the chair to movements of the user is improved.
  • FIGS. 16 to 24 Structural and functional features of a spring device of the backrest support 5 are described. It show the 16 and 17 a part of a mechanism in a perspective view, where in 16 the second backrest support element 11 is dismantled for a better view. This second backrest support element 11 is in 17 shown separately.
  • the 18 and 19 is the fully assembled backrest support 5 in a cross section ( 18 ) and a longitudinal section ( 19 ) shown, wherein the second backrest support member 11 is not inclined laterally.
  • Figures 20 to 22 show the situation with a second backrest support element 11 inclined laterally to the left in two cross sections at different cutting planes ( 20, 21 ) and a longitudinal section ( 22 ).
  • 23 and 24 show the situation with a second one leaning sideways to the right Backrest support element 11 in a cross section and a longitudinal section.
  • the spring device 53 of the backrest support 5 comprises two spring elements 54, 55.
  • the spring elements 54, 55 of the spring device 53 acting at suitable points on the backrest support 5 hold the second backrest support element 11 in its non-inclined basic position in position relative to the first backrest support element 9 and support or effect it in the inclined state, the second backrest support element 11 is returned to its basic position.
  • the spring elements 54, 55 are provided in such a way that they only act on parts of the backrest support 5, namely on the first backrest support element 9 on the one hand and on the second backrest support element 11 on the other hand, in order to close the second backrest support element 11 in its basic position, which is not inclined to the right or left keep.
  • the spring elements 54, 55 are fully integrated into the backrest support 5 and are completely surrounded by the backrest support 5.
  • the first back support element 9 has two first spring receptacles 56, 57 and the second backrest support element 11 has two second spring receptacles 58, 59.
  • the spring mounts 56, 57, 58, 59 are formed as half shells.
  • a first spring seat 56, 57 interacts with a second spring seat 58, 59 in such a way that these two spring seats together form a cylindrical spring seat space 61, 62 in which one of the spring elements 54, 55 rests.
  • a total of two spring receiving spaces 61, 62, each with a spring element 54, 55, are therefore provided.
  • Each of these spring elements 54, 55 is completely in one Spring receiving space 61, 62, ie each of the spring elements 54, 55 is completely surrounded by the walls of the spring receiving space 61, 62.
  • the separating surface 63 between the two backrest support elements 9, 11 runs through the spring receiving space 61, 62 and divides the spring receiving space 61, 62 into the two spring seats.
  • the volume of the spring receiving space 61, 62 available for accommodating the at least one spring element 54, 55 can be changed by rotating the second backrest support element 11 relative to the first backrest support element 9 about the axis of rotation 12. In particular, this volume is reduced when the second backrest support element 11 inclines to the right or left. As a result, the spring element 54, 55 lying in the spring receiving space 61, 62 is compressed. This takes place when the second backrest support element 11 is rotated in both spring receiving spaces 61, 62 with both spring elements 54, 55.
  • each of these spring elements 54, 55 is acted upon on both sides, namely on two opposite sides 64, 65, here above and below, see in particular 22 and 24 .
  • each spring element 54, 55 is acted upon both by the first backrest support element 9 and by the second backrest support element 11 in such a way that both backrest support elements 9, 11 are each on different, opposite sides of the spring element 54, 55 attack, here at the spring ends 66, 67.
  • the sides on which the backrest support elements 9, 11 act on the spring elements 54, 55 change depending on the direction of rotation (double arrow 68) of the second backrest support element 11.
  • the spring elements 54, 55 used in the illustrated example are helical compression springs.
  • the loading of these springs by the boundaries 64, 65 of the spring receiving spaces 61, 62 does not take place directly and immediately. Instead, strike the spring elements 54, 55, preferably exclusively via spring plates 71, 72, which are provided at the ends 66, 67 of the spring elements 54, 55, on the walls 64, 65 of the spring receiving spaces 61, 62, while the turns of the coil springs Do not touch the walls of the spring receiving spaces 61, 62. This prevents or reduces friction between the spring elements 54, 55 and the boundaries of the spring receiving spaces 61, 62.
  • each helical compression spring 54, 55 preferably terminates with a spring plate 71, 72, the diameter of which is larger than the coil diameter of the helical compression spring.
  • the helical spring 54, 55 is typically made of steel, a particularly slippery, low-wear material is used for the spring plates 71, 72, in particular a suitable plastic material.
  • the spring plates 71, 72 are designed in such a way that they not only cover the end faces of the compression spring, but also protrude into the interior of the springs and in this way guide the spring and at the same time prevent the compression springs from buckling when compressed.
  • non-cylindrical helical springs or other elastic spring elements can also be used, such as, for example, cylindrical or cuboid spring elements, in particular made of elastic plastic materials. So can in the spring receiving spaces 61, 62, for example, cylindrical spring elements made of solid rubber.
  • the shape of the spring receptacles 56, 57, 58, 59 and thus the shape of the spring receptacle spaces 61, 62 is in any case advantageously adapted to the shape of the spring elements 54, 55 or vice versa, so that it is ensured that - corresponding to the division of a spring receptacle space 61 , 62 into its two spring receptacles 56, 57, 58, 59, which interact in the manner of half-shells - when the second backrest support element 11 rotates about the axis of rotation 12, part of one end 66 of the spring element 54, 55 always moves from the one backrest support element 9, 11 and a part of the other end 67 of the spring element 54, 55 is acted upon by the respective other backrest support element 9, 11.
  • Each spring element 54, 55 fills its spring receiving space 61, 62, which is formed from two semi-cylindrical spring seats 56, 57, 58, 59, at least so completely that the spring element 54, 55, if necessary with its spring plates 66, 67 or the like, fits in the spring receiving space 61, 62 rests, in particular in such a way that the spring element 54, 55 has no play in the spring receiving space 61, 62. If spring elements are used which cannot be acted upon via spring plates or the like, but can be acted upon directly, such as rubber cylinders or the like, these are preferably designed in such a way that they completely fill the unreduced spring receiving space 61, 62.
  • spring devices 53 are provided, the spring elements 54, 55 of which lie in the spring receiving spaces 61, 62, regardless of the type, without pretension.
  • the spring elements 54, 55 By appropriately adapting the shape and/or size of the spring receiving spaces 61, 62 or the spring elements 54, 55, in the simplest case by optionally inserting larger spring elements 54, 55, a spring device 53 be provided, the spring elements 54, 55 are in the inserted state under prestress, this should be desired for the tilting characteristics of the backrest.
  • the two spring receiving spaces 61 , 62 are arranged horizontally on both sides of the axis of rotation 12 and vertically at the level of the axis of rotation 12 .
  • the axis of rotation 23 runs in the longitudinal direction 8 of the chair and is defined by the course of a bearing pin 69 which is provided on the first backrest support element 9 and which lies in a corresponding bearing opening 70 in the second backrest support element 11 .
  • the spring receiving spaces 61 , 62 can also be arranged which is not symmetrical to the axis of rotation 12 .
  • This can be the case in particular if the spring device 53 of the backrest support 5 is implemented with a single spring element 54, which lies in a single spring receiving space 61, for example only on one side of the axis of rotation 12. Even with just a single spring element 54, the provide required functionality. Will be two though or more spring elements 54, 55 are used, spring elements 54, 55 with smaller dimensions can be used, which can be advantageous for the structure of the chair mechanism 1 as a result. In particular, mechanisms 1 can then be realized with a lower overall height.
  • An arrangement of the spring receiving space 61, 62 to the right and/or left of the axis of rotation 12 in the horizontal can be combined in the vertical with an arrangement above, below or at the height of the axis of rotation 12.
  • the at least one spring receiving space 61, 62 is to be provided at such a distance from the axis of rotation 12 that the walls of the receiving space 61, 62 formed by the spring seats 56, 57, 58, 59 in the backrest support elements 9, 11 move when the second backrest support element 11 can move sufficiently, in particular be able to travel a sufficient distance vertically to reduce the volume of the receiving space 61, 62 to an extent or to load the at least one spring element 54, 55 to an extent that is sufficient for compression of the Spring element 54, 55 and the provision of the required restoring force for the backrest is sufficient, which is preferably rigidly connected to the second backrest support element 11.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
EP21020469.9A 2020-09-24 2021-09-20 Mécanisme pour une chaise Pending EP3973820A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020124975.6A DE102020124975A1 (de) 2020-09-24 2020-09-24 Mechanik für einen Stuhl

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EP3973820A1 true EP3973820A1 (fr) 2022-03-30

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EP21020469.9A Pending EP3973820A1 (fr) 2020-09-24 2021-09-20 Mécanisme pour une chaise

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EP (1) EP3973820A1 (fr)
CN (1) CN114246431A (fr)
DE (1) DE102020124975A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN113729428A (zh) * 2021-05-27 2021-12-03 广东联友办公家具有限公司 一种电控底盘及座椅

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048668A1 (fr) * 1997-04-30 1998-11-05 Haworth, Inc. Dossier de fauteuil a mouvement lateral de torsion
DE202014101592U1 (de) * 2014-04-04 2014-06-30 Wilkhahn Wilkening + Hahne Gmbh + Co. Stuhl
EP3345507A1 (fr) 2017-01-04 2018-07-11 BOCK 1 GmbH & Co. KG Mécanisme pour une chaise

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006030018A1 (de) * 2006-06-29 2008-01-03 Grahl Working Well Gmbh Rückenlehne für einen Stuhl oder Sessel und mit einer derartigen Rückenlehne ausgerüsteter Stuhl oder Sessel
DE102012107778B4 (de) * 2012-08-23 2018-08-16 Haworth Gmbh Stuhl, insbesondere Bürostuhl
US10272282B2 (en) * 2016-09-20 2019-04-30 Corecentric LLC Systems and methods for providing ergonomic chairs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048668A1 (fr) * 1997-04-30 1998-11-05 Haworth, Inc. Dossier de fauteuil a mouvement lateral de torsion
DE202014101592U1 (de) * 2014-04-04 2014-06-30 Wilkhahn Wilkening + Hahne Gmbh + Co. Stuhl
EP3345507A1 (fr) 2017-01-04 2018-07-11 BOCK 1 GmbH & Co. KG Mécanisme pour une chaise

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DE102020124975A1 (de) 2022-03-24

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