EP3741256B1 - Mécanique synchrone - Google Patents

Mécanique synchrone Download PDF

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Publication number
EP3741256B1
EP3741256B1 EP20000175.8A EP20000175A EP3741256B1 EP 3741256 B1 EP3741256 B1 EP 3741256B1 EP 20000175 A EP20000175 A EP 20000175A EP 3741256 B1 EP3741256 B1 EP 3741256B1
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EP
European Patent Office
Prior art keywords
support
spring
coupling
backrest
seat
Prior art date
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Active
Application number
EP20000175.8A
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German (de)
English (en)
Other versions
EP3741256A1 (fr
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
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Bock 1 GmbH and Co KG
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Publication of EP3741256A1 publication Critical patent/EP3741256A1/fr
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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
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • 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
    • 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

Definitions

  • the invention relates to a synchronous mechanism for a correlated seat-backrest movement of an office chair, with a base support that can be placed on a chair column, a seat support and a backrest support.
  • the invention relates to seating furniture, in particular an office chair, with a synchronous mechanism.
  • synchronous mechanics refers to assemblies in the seat base of an office chair that ensure coupled kinematics that result in a specific relative movement of the seat and backrest to one another.
  • the seat of the office chair which usually has a padded seat, is mounted on the seat support.
  • the backrest support which extends backwards in the usual way from the actual synchronous mechanism, supports the backrest of the office chair on an upwardly extending arm.
  • Such synchronous mechanisms not only often have a comparatively complicated structure, consist of a large number of interacting components and/or are complex to assemble, but also often take up a comparatively large amount of installation space. Installation space also requires a device for adjusting the pivoting resistance of the backrest.
  • a comparatively flat mechanical system is in GB 2 119 641 A described. However, the flat design could only be achieved by not adjusting the swivel resistance of the backrest.
  • An object of the present invention is to make possible a piece of seating furniture, in particular an office chair, which only requires a comparatively small installation space for the use of a Synchronous mechanism is required, in particular is particularly flat, although the pivoting resistance of the backrest can be adjusted with the synchronous mechanism used.
  • This task is achieved by a synchronous mechanism according to claim 1 or by seating furniture according to claim 7.
  • Advantageous embodiments of the invention are specified in the subclaims.
  • a synchronous mechanism for a correlated seat-backrest movement of an office chair, with a base support that can be placed on a chair column, a seat support and a backrest support, the backrest support being pivotally connected to the base support, thereby defining the main axis of rotation of the synchronous mechanism, with a coupling device , comprising a first coupling element (tension coupling) which is operatively connected to the backrest support and a second coupling element (support coupling) which is operatively connected to the base support, the first coupling element and the second coupling element being connected to one another in an articulated manner at a connection point, and with a spring arrangement for fixing the pivoting resistance of the backrest support, wherein the spring arrangement has at least one spring element, the spring element having a stationary end and a free end, the free end of the spring element engaging on the connection point of the coupling device, for example by the free end of the spring element on the connection point of the coupling device is articulated or is supported on the connection point.
  • the first coupling element is articulated to the backrest support at a distance from the connection point and, when the backrest support pivots, pulls the connection point of the two coupling elements forward as seen in the longitudinal direction of the seat, thereby acting on the spring element acting as a compression spring.
  • the second coupling element is supported with one of the Connecting point spaced adjusting end, preferably via a support element articulated to the second coupling element, in particular a sliding shoe or the like, at a support point of the base support.
  • the adjustment mechanism for adjusting the spring force of the at least one spring element comprises a track element which is movably attached to the base support and which provides the support point.
  • the present synchronous mechanism is characterized by the fact that it can be designed to be particularly flat due to the special design of the coupling device, which will be explained in detail below, so that a corresponding assembly requires very little installation space.
  • a spring mechanism with one or more spring elements is provided, since the spring mechanism can be designed in such a way that the at least one spring element connects the coupling element to the base support without requiring additional installation space beyond the already provided housing volume of the base support. This is particularly true when the spring element is connected to the coupling element on the one hand and to the front region of the base support and is therefore arranged lying comparatively flat inside the assembly.
  • the coupling device is designed in such a way that by actuating the adjustment mechanism, the location of the support point and thus the connection point of the two coupling elements in the vertical direction and thus the preload of the at least one spring element can be changed and / or that by actuating the adjustment mechanism the spring action direction on the one hand and the distance of the spring action direction from the main axis of rotation (more precisely the distance between the articulation point of the spring element at the connection point of the coupling elements and the Main axis of rotation) and thus the effective lever arm influencing the pivoting resistance of the backrest support can be changed.
  • the track element is designed as a part of the base support, the position of which can be changed relative to the base support, for which purpose it is preferably as a portable construction element running in a guide of the base support.
  • the track element interacts with the position-variable spring end of the at least one spring element in that the support coupling articulated at the connection point is supported on the track element via a sliding shoe which is articulated to the adjusting end of the support coupling, forming the support point.
  • the track element can be moved into vertically different positions of the support point by a manual or motorized movement of the track element by the user, which can each be assigned to different spring forces.
  • a rack that is operatively connected to the track element as an adjustment means is advantageous because of the precisely definable movement of the track element and thus ultimately of the position-variable spring end by using a gear to drive the rack.
  • connection point of the two coupling elements viewed in the longitudinal direction of the seat, is arranged both behind the articulation point of the first coupling element on the backrest support and behind the stationary end of the spring element, and / or that in the non-pivoted basic position of the backrest support, the connection point of the two coupling elements, viewed in the longitudinal direction of the seat, is both behind the Main axis of rotation as well as behind the adjusting end of the second coupling element is arranged, and / or that in the maximum backwards pivoted position of the backrest support, the connection point of the two coupling elements, viewed in the longitudinal direction of the seat, is arranged both in front of the main axis of rotation and in front of the adjusting end of the second coupling element.
  • Front or “front” means that a component is arranged at the front in the longitudinal direction 14 of the seat or refers to a component that extends in the direction of the front edge of the seat or points in this direction
  • rear or “rear” means that a component is arranged at the rear in the longitudinal direction 14 of the seat or refers to a component that extends in the direction of the backrest or the backrest support 4 or the rear edge of the seat or points in this direction.
  • the information “above” and “below” refers to the intended use of the office chair or the office chair mechanism 100.
  • the synchronous mechanism 100 has a base support 1, which is attached to the upper end of a chair column 10 (see Fig. 1 ) is set.
  • the synchronous mechanism 100 includes a substantially frame-shaped seat support 3 and a backrest support 4, which is forked in plan view, the cheeks 5 of which are arranged on both sides of the base support 1.
  • the seat support 3 is intended to accommodate or mount a preferably upholstered seat (not shown).
  • the assembly is carried out using tools not shown in detail Fasteners in the usual way.
  • a backrest not shown, is attached to the backrest support 4 and is height-adjustable in modern office chairs.
  • the backrest can also be connected in one piece to the backrest support 4.
  • the entire synchronous mechanism 100 is constructed mirror-symmetrically with respect to its central longitudinal plane, as far as the actual kinematics are concerned. In this respect, the following description always assumes that construction elements of the actual pivoting mechanism are present in pairs on both sides.
  • FIG. 1 and 3 the basic position of the synchronous mechanism 100 is shown, in which the seat support 3 assumes an essentially horizontal position.
  • Fig. 2 and 4 show the synchronous mechanism 100 in a maximum rearward pivoted position of the backrest support 4.
  • the backrest support 4, which can be pivoted in the pivoting direction 7, is directly articulated with its cheek 5, which extends in the direction of the front region 17 of the mechanism, about a first transverse axis 11 with the base support 1, this transverse axis defining the main axis of rotation 11 of the synchronous mechanism 100.
  • the main axis of rotation 11 lies in front of the cone receptacle 2, viewed in the longitudinal direction 14 of the seat.
  • the backrest support 4 is connected to the rear area 25 of the seat support 3 with an upwardly extending driver 12 of the cheek 5 via a swivel/sliding joint 24.
  • the main axis of rotation 11 is therefore seen in the longitudinal direction 14 of the seat in front of it Swivel/sliding joint 24 formed transverse axis 13 arranged. Pivoting the backrest support 4 out of the basic position into a backwards pivoted position is associated with a lowering movement of the rear region 25 of the seat support 3.
  • the front area 18 of the base support 1 is directly connected in an articulated manner to the front area 8 of the seat support 3, forming a further transverse axis 15.
  • the relative movement of the seat support 3 and backrest support 4 to one another is essentially determined by the position of the three joint axes 11, 13, 15 relative to one another.
  • a joint is used to form a simple pivot point in the rear area 6 of the mechanism instead of the swivel/sliding joint, while at the same time a swivel/sliding joint is used in the front area 17 of the mechanism instead of the simple joint.
  • the axis 13 defines a pure pivot point, while the axis 15 is designed to be movable.
  • the backrest support 4 is connected directly to the seat support 3 only once, namely via the transverse axis 13.
  • the base support 1 is connected directly to the seat support 3 only once, namely via the transverse axis 15.
  • the further connection of the backrest support 4 to the base support 1 takes place via the coupling device 20 according to the invention (traction coupling and support coupling) as well as on the coupling device 20 attacking spring arrangement 19.
  • the pivoting mechanism described ensures that the backrest support 4 can be pivoted downwards with the backrest about the main axis of rotation 11 in the pivoting direction 7. At the same time, this pivoting movement of the backrest support 4 induces an immediate lowering movement of the rear area 25 of the seat support 3 towards the rear. The front area 8 of the seat support 3 is not raised. When the backrest support 4 is pivoted, the base support 1 remains stationary.
  • the coupling device 20 comprises a first coupling element (tension coupling) 21 which is operatively connected to the backrest support 4 and a second coupling element (support coupling) 22 which is operatively connected to the base support 1, the first coupling element 21 and the second coupling element 22 being articulated to one another at a connection point 16 are connected.
  • the tension coupling 21 is articulated to the backrest support 4 at a distance from the connection point 16 to form a rotation axis 39 and, when the backrest support 4 moves in the pivoting direction 7, pulls the connection point 16 of the two coupling elements 21, 22 forward as seen in the longitudinal direction 14 of the seat, which means that spring element 30 acting as a compression spring.
  • the support coupling 22 is supported with its adjusting end 23, which is spaced from the connection point 16, at a support point 9 on a slideway 26 of the base support 1. In the example illustrated here, this is done via a support element, in particular a sliding shoe 48 or the like, which is attached in an articulated manner to the adjusting end 23 of the support coupling 22. Except with the backrest support via the articulation point 39 on the one hand and with the base support via the support point 9 and via the spring element 30 on the other hand, the coupling arrangement 20 is not connected to any other structural element of the mechanism, neither directly nor indirectly.
  • the spring element 30 has a spring arrangement 19 for determining the pivoting resistance of the backrest support 4.
  • the spring element 30 is acted upon when the backrest support 4 is pivoted.
  • the synchronous movement (seat and backrest) takes place against a more or less large spring resistance.
  • a spring arrangement 19 with a centrally arranged helical compression spring 30 is provided (not shown in detail in all figures).
  • the spring element 30 is supported on the one hand with its stationary end 27 on a front abutment 31 and on the other hand with its free, position-changing end 28 on a rear abutment 37, each with the help of spring plates 32, 34, the rear abutment 37 being supported by the articulated connection of the two coupling elements 21, 22 are formed at the connection point 16.
  • the spring 30, which is only in Fig. 2 is symbolically indicated, encompasses guide rods or sleeves 33 running into one another, which have the spring plates 32, 34 at their respective ends.
  • the spring element 30 is connected directly to the base support 1 with its one front spring end 27, as seen in the longitudinal direction 14 of the seat, in that it is supported in an articulated manner with the spring plate 32 there in a suitable bearing 31. With its other, rear spring end 28, seen in the longitudinal direction 14 of the seat, the spring element 30 is supported with its spring plate 34 there at the connection point 16 of the two coupling elements 21, 22 in such a way that a movement of the backrest support 4 from one Basic position in a position pivoted backwards causes this rear spring end 28 to be acted upon.
  • the spring element 30 is loaded on one side, namely at its rear spring end 28.
  • the rear spring end 28 is connected to the coupling device 20, namely the connection point 16, at a distance from the main axis of rotation 11, in order to form an effective lever arm 36, by being supported there.
  • connection point 16 of the two coupling elements 21, 22, viewed in the longitudinal direction 14 of the seat is both behind the articulation point 39 of the tension coupling 21 to the backrest support 4 and behind the stationary end 27 of the spring element 30 arranged.
  • connection point 16 of the two coupling elements 21, 22, viewed in the longitudinal direction 14 of the seat is arranged both behind the main axis of rotation 11 and behind the adjusting end 23 of the support coupling, more precisely the support point 9.
  • connection point 16 of the two coupling elements 21, 22 is seen in the longitudinal direction 14 of the seat the main axis of rotation 11 as well as in front of the adjusting end 23 of the support coupling 22, more precisely the support point 9, arranged.
  • the adjustment mechanism 40 includes means for adjusting the spring force of the spring element 30 by changing the position of the rear spring end 28.
  • the adjusting mechanism 40 includes a movably attached to the base support 1, namely along the guide 42 in the adjusting direction 49, see Fig. 5 , displaceable track element 41, which provides the support point 9 for the support paddock 22.
  • the coupling device 20 is designed in such a way that by actuating the adjusting mechanism 40, the location of the support point 9 and thus the location of the connection point 16 of the two coupling elements 21, 22 in height (in the vertical direction) and thus the preload of the at least one spring element 30 can be changed .
  • the adjustment mechanism 40 by actuating the adjustment mechanism 40, the spring action direction (direction of the spring action line) 38 on the one hand and the distance between the articulation point 16 of the spring element 30 on the coupling device 20 on the one hand and the main axis of rotation 11 on the other hand can be changed.
  • the effective lever arm 36 influencing the pivoting resistance of the backrest support 4 can also be determined directly.
  • the track element 41 is designed as part of the base support 1.
  • the position of the track element 41 relative to the base support 1 can be changed.
  • the track element 41 is designed as a portable construction element which runs in a rectilinear guide 42 of the base support 1 which is inclined to the horizontal and lowers backwards as seen in the longitudinal direction 14 of the seat.
  • the track element 41 forms a direction Support coupling 22 slideway 26 running obliquely to the horizontal, on which the adjusting end 23 of the support coupling 22 is supported. Therefore, when the pivoting resistance is adjusted, the support coupling 22 is pressed downwards (due to the movement of the track element 41 forward in the direction of "heavy setting"), which changes the vertical position of the rear spring end 28.
  • the track element 41 interacts with the position-variable spring end 28 of the spring element 30 in that the support coupling 22 articulated at the connection point 16 is supported on the track element 41 via the sliding shoe 48 which is articulated to the adjusting end 23 of the support coupling 22, forming the support point 9 .
  • a rack 43 is attached to the track element 41 and the adjusting mechanism 40 has a gear 44 for adjusting the track element 41, the gear 44 engaging in the rack 43 for adjusting the track element 41.
  • the gear 44 is rotated, for example, by means of a manually operable handle (not shown), for example a rotary handle or a handwheel.
  • the gear 44 can also be driven via levers, Bowden cables, etc.
  • An (electric) motor drive can also be provided instead of manual operation. Moving the track element 41 can also be done without a rack/gear mechanism using suitable alternative actuation means.
  • the slideway 26 can also have a non-rectilinear curve shape and/or a different slope, whereby the adjustment characteristics of the pivoting resistance can be changed compared to the variant shown here.
  • the track element 41 In the in the Fig. 1 and 2 In the hardest setting shown, the track element 41 is in its frontmost position. The support point 9 is therefore located at the rear end of the slideway 26 and is therefore particularly deep. The distance 35 between the line of action 38 of the spring 30 and the main axis of rotation 11 of the mechanism is greatest in this position, or to put it another way, the length of the effective lever arm 36, which is perpendicular to the line of spring action 38, is the largest. The spring 30 is most compressed due to the greater preload. The swivel resistance is greatest in this position. The spring 30 already has the greatest hardness at the beginning of the pivoting process, without pivoting the backrest support 4 being necessary. The restoring torque acting on the mechanics in this setting when the backrest support 4 is pivoted is also maximum.

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)

Claims (7)

  1. Mécanisme de synchronisation (100) pour un mouvement corrélé d'un siège et d'un dossier d'une chaise de bureau, comprenant un support de base (1) pouvant être placé sur une colonne de chaise (10), un support de siège (3) et un support de dossier (4), dans lequel le support de dossier (4) est relié au support de base (1) de manière pivotante, en définissant ainsi l'axe de rotation principal (11) du mécanisme de synchronisation (100),
    comprenant un dispositif de couplage (20), présentant un premier élément de couplage (21) en liaison fonctionnelle avec le support de dossier (4) et un deuxième élément de couplage (22) en liaison fonctionnelle avec le support de base (1), dans lequel le premier élément de couplage (21) et le deuxième élément de couplage (22) sont reliés l'un à l'autre de manière articulée au niveau d'un point de liaison (16), dans lequel le premier élément de couplage (21) est articulé sur le support de dossier (4) de manière espacée du point de liaison (16) et tire le point de liaison (16) des deux éléments de couplage (21, 22) vers l'avant vu dans la direction longitudinale de siège (14) lors d'un mouvement de pivotement du support de dossier (4) s'effectuant d'une position de base non pivotée à une position pivotée vers l'arrière vu dans la direction longitudinale du siège (14), et dans lequel le deuxième élément de couplage (22) s'appuie sur un point d'appui (9) du support de base (1) par une extrémité de réglage (23) espacée du point de liaison (16),
    et comprenant un ensemble à ressort (19) servant à définir la résistance au pivotement du support de dossier (4), dans lequel l'ensemble à ressort (19) présente au moins un élément ressort (30), dans lequel l'élément ressort (30) présente une extrémité fixe (27) et une extrémité libre (28), dans lequel l'extrémité libre (28) vient en prise avec le dispositif de couplage (20) au niveau du point de liaison (16),
    caractérisé par un mécanisme de réglage (40) servant au réglage de la force de ressort de l'au moins un élément ressort (30), le mécanisme de réglage (40) présentant un élément de voie (41) monté sur le support de base (1) de manière mobile, élément de voie sur lequel le point d'appui (9) se trouve.
  2. Mécanisme de synchronisation (100) selon la revendication 1, dans lequel l'extrémité fixe (27) de l'élément ressort (30) vient en prise avec le support de base (1).
  3. Mécanisme de synchronisation (100) selon la revendication 1 ou 2, dans lequel, grâce à un actionnement du mécanisme de réglage (40), l'emplacement du point d'appui (9) et donc l'emplacement du point de liaison (16) des deux éléments d'accouplement (21, 22) dans la direction verticale et par conséquent
    a) la précontrainte de l'au moins un élément ressort (30) et/ou
    b) la direction d'action de ressort (38) et la distance (35) de la direction d'action de ressort (38) à l'axe de rotation principal (11) peuvent être modifiés.
  4. Mécanisme de synchronisation (100) selon l'une des revendications 1 à 3, dans lequel une crémaillère (43) est montée sur l'élément de voie (41) et le mécanisme de réglage (40) présente une roue dentée (44) servant au réglage de l'élément de voie (41).
  5. Mécanisme de synchronisation (100) selon l'une des revendications 1 à 4, dans lequel
    a) indépendamment de la position en pivotement du support de dossier (4), le point de liaison (16) des deux éléments de couplage (21, 22) est disposé à la fois derrière le point d'articulation (39) du premier élément de couplage (21) sur le support de dossier (4) et derrière l'extrémité fixe (27) de l'élément ressort (30), vu dans la direction longitudinale du siège (14),
    b) dans la position de base non pivotée du support de dossier (4), le point de liaison (16) des deux éléments de couplage (21, 22) est disposé à la fois derrière l'axe de rotation principal (11) et derrière le point d'appui (9) du deuxième élément de couplage (22), vu dans la direction longitudinale du siège (14),
    c) dans la position, pivotée au maximum vers l'arrière, du support de dossier (4), le point de liaison (16) des deux éléments de couplage (21, 22) est disposé à la fois devant l'axe de rotation principal (11) et devant le point d'appui (9) du deuxième élément de couplage (22), vu dans la direction longitudinale du siège (14).
  6. Mécanisme de synchronisation (100) selon l'une des revendications 1 à 5, dans lequel le support de dossier (4) est relié au support de siège (3), de telle sorte que, lors d'un mouvement de pivotement (7) du support de dossier (4) d'une position de base à une position pivotée vers l'arrière par rapport au support de base fixe (1), le support de siège (3) est entraîné vers l'arrière.
  7. Meuble d'assise, en particulier chaise de bureau, comprenant un mécanisme de synchronisation (100) selon l'une des revendications 1 à 6.
EP20000175.8A 2019-05-21 2020-05-07 Mécanique synchrone Active EP3741256B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019113582.6A DE102019113582B4 (de) 2019-05-21 2019-05-21 Synchronmechanik

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EP3741256A1 EP3741256A1 (fr) 2020-11-25
EP3741256B1 true EP3741256B1 (fr) 2023-11-08

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DE102021107681A1 (de) * 2021-03-26 2022-09-29 Bock 1 Gmbh & Co. Kg Mechanik

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GB2119641A (en) * 1982-05-10 1983-11-23 Zuend & Co Ag K An improved seat

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CN111972894B (zh) 2024-07-12

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