EP4115768A1 - Système mécanique pour une chaise - Google Patents

Système mécanique pour une chaise Download PDF

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Publication number
EP4115768A1
EP4115768A1 EP22020113.1A EP22020113A EP4115768A1 EP 4115768 A1 EP4115768 A1 EP 4115768A1 EP 22020113 A EP22020113 A EP 22020113A EP 4115768 A1 EP4115768 A1 EP 4115768A1
Authority
EP
European Patent Office
Prior art keywords
spring
chair
spring end
backrest support
end positioning
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
EP22020113.1A
Other languages
German (de)
English (en)
Inventor
Bock Hermann
Wachter Guido
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 EP4115768A1 publication Critical patent/EP4115768A1/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
    • A47C1/03261—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
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
    • A47C7/462—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs adjustable by mechanical 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
    • A47C1/03255—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
    • 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
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/14—Seat parts of adjustable shape; elastically mounted ; adaptable to a user contour or ergonomic seating positions

Definitions

  • the invention relates to a mechanism for a chair, in particular for an office chair.
  • Mechanisms for chairs, especially office chairs, are known in a variety of designs. So-called synchronous mechanisms are used for a high level of seating comfort. This is understood to mean assemblies in the seat substructure of an office chair, which ensure kinematics that are coupled to one another and bring about a certain 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.
  • Synchronous mechanisms for chairs, in particular office chairs, are often constructed in a comparatively complicated manner, consist of a large number of interacting components and/or are complicated to assemble.
  • One object of the present invention is to provide a mechanism that is structurally particularly simple. This object is achieved by a mechanism according to claim 1 or claim 10. Advantageous embodiments of the invention are specified in the dependent claims.
  • a mechanism for a chair in particular an office chair, is provided, with a mechanism that can be placed on a substructure base support and a backrest support, the backrest support being pivotably connected to the base support about a first transverse axis, and having a spring mechanism for adjusting the pivoting resistance of a backrest of the chair, the spring mechanism having at least one spring element, the at least one spring element being arranged in the longitudinal direction of the chair and acts between the backrest support and the base support, the spring mechanism having at least one spring end positioning element, the at least one spring element acting on the spring end positioning element with its rear spring end, viewed in the longitudinal direction of the chair, and on the base support with its front spring end, viewed in the longitudinal direction of the chair, with the spring end positioning element having the Backrest support is connected via a coupling element in such a way that by pivoting the backrest support about the first transverse axis in the longitudinal direction of the chair to the rear, the spring end position positioning element is moved forward in the longitudinal direction of the chair,
  • a mechanism for a chair in particular an office chair, in which the rear spring end of a spring element acting between the backrest support and the base support of the mechanism is designed to be mobile and in which a Pivoting of the backrest support backwards in the longitudinal direction of the chair, the rear end of the spring is controlled by a coupling element articulated on the backrest support in such a way that it is pulled forward in the longitudinal direction of the chair.
  • the mechanism is preferably designed in such a way that the rear end of the spring is only pulled and not pushed or pushed.
  • the rear spring end of the at least one spring element is not acted upon by pressure or thrust from behind, but instead exclusively by tension from the front, no complex backrest construction acting on the rear spring end is required. Instead, only a suitable coupling element that interacts with the backrest support is to be provided, which engages the rear end of the spring when the backrest support pivots and pulls it forward. Because the coupling element controls the rear end of the spring in this way, the construction of the mechanism can be simplified.
  • the coupling element is preferably connected to the backrest support such that it can be pivoted about a second transverse axis and is also rotatably connected to the spring end positioning element.
  • the articulated connection of the coupling element to the spring end positioning element ensures that the spring end positioning element can be taken along by the coupling element into any permissible position.
  • This second transverse axis preferably lies in front of the rear end of the spring, viewed in the longitudinal direction of the chair. In this way it is ensured that the coupling element can extend backwards in the longitudinal direction of the chair in order to connect to the spring end positioning element and this forwards be taken with you when the backrest support pivots backwards.
  • the arrangement of the second transverse axis in front of the rear end of the spring is preferably made possible in that at least part of the backrest support extends forward in the longitudinal direction of the chair beyond the position of the rear end of the spring.
  • the coupling element which is articulated at this front end of the backrest support and extends backwards in the longitudinal direction of the chair, i.e. backwards
  • the spring end positioning element connected to the coupling element is carried along by the coupling element and pulled forward when the backrest support pivots backwards.
  • the seat back support pulls the spring end positioning member forward as it pivots rearward. This causes a reduction in the distance between the two spring ends.
  • the spring element designed as a compression spring is compressed. The user of the chair feels this as a pivoting resistance of the backrest against which he is leaning. When the user stops leaning against the backrest, the compressed spring element moves the backrest support forwards back into its non-pivoted starting position.
  • the spring end positioning element and thus also the rear spring end of the at least one spring element are preferably arranged at a distance from the first transverse axis. It has proven to be particularly advantageous if the spring mechanism has a spacer which acts between the first transverse axis on the one hand and the spring end positioning element on the other hand and spaces the spring end positioning element from the first transverse axis.
  • the spacer is preferably designed to adjust the spring force of the at least one spring element, in particular in such a way that the distance between the rear end of the spring and the first transverse axis can be changed by means of the spacer.
  • the spring mechanism has means for adjusting the spring force of the at least one spring element in such a way that the distance of a spring end of the at least one spring element from the first transverse axis can be changed.
  • the effective lever arm which determines the loading of this spring end and thus influences the pivoting resistance of the backrest support, can be lengthened or shortened.
  • the spacer is preferably designed in such a way that the rear spring end of the at least one spring element can be moved on a circular path with a substantially constant radius around the front spring end of this spring element.
  • the spring force is preferably adjusted in such a way that no work has to be performed against the spring force.
  • the setting means are designed in such a way that the position-changeable end of the spring can be moved around the other end of the spring on a circular path with a substantially constant radius. The bias of the spring element remains unchanged.
  • the spacer is embodied as, has, or cooperates with a movably mounted cam
  • the spring end positioning element is embodied as a cam roller cooperating with the cam of the cam in this way forms a cam drive, wherein the cam roller interacting with the rear spring end of the at least one spring element can be moved into positions of different spring force by a movement of the cam carrier.
  • the adjustment means comprise a cam drive whose cam roller interacting with a cam carrier is connected to a positionable spring end of the at least one spring element and can be moved into positions of different spring forces by the user manually or motor-driven movement of the cam carrier.
  • the use of a cam drive as the adjustment means is advantageous because the movement curve of the spring end can be precisely defined by the predetermined curve slope.
  • the spacer is preferably designed as an eccentric and is rotatably mounted about the first transverse axis, so that there are different distances between the curve of the curve carrier and the first transverse axis and the distance between the first transverse axis and the spring end positioning element and thus the distance between the first transverse axis and the rear end of the spring can be changed by rotating the spacer about the first transverse axis.
  • the spring end positioning element serving as a cam roller of the cam drive runs on one side on the cam against which it is pressed by the at least one spring element.
  • the spacer is used solely for the spring end positioning member to bear against; the spring end positioning element is not acted upon by the spacer during pivoting of the backrest support, the spring end positioning element is acted upon exclusively by the Coupling element by pulling the spring end positioning element forward.
  • the mechanism is preferably designed as a synchronous mechanism for a correlated movement of the seat and backrest of an office chair. Like every mechanism, this one also has a seat support.
  • the number of coupling elements in particular the number of elements connecting the seat support and backrest support, can be reduced in order to achieve a particularly simple structural design of the mechanism without sacrificing the desired functionality of a synchronous mechanism.
  • the backrest support is pivotable about a transverse axis and thus defines the main pivot axis of the mechanism with the base support as well as with the seat support, preferably directly, i.e. directly and without the interposition of an additional coupling element or the like, articulated.
  • the seat support is preferably also directly connected in an articulated manner to the base support.
  • the three main mechanical components, base support, seat support and backrest support are preferably connected to one another in such a way that a pivoting movement of the backrest from a basic position to a rearwardly pivoted position causes both an immediate lowering movement of the rear area of the seat support, viewed in the longitudinal direction of the chair, downwards and an immediate lifting movement of the front area of the seat support seen in the longitudinal direction of the chair is induced upwards.
  • the rear area of the seat is lowered when the backrest is pivoted into its rearwardly pivoted position, while the front area of the Seat is raised.
  • the lowering of the rear seat area takes place immediately each time you leave the basic position.
  • the basic position is that position in which the backrest is not pivoted backwards.
  • the seat support is lowered in its rear area and at the same time the front area of the seat support is raised, the seat is carried along synchronously in a defined relationship to the backrest and the seat surface is tilted. This results in the desired synchronous effect, in which the angle of the seat support changes to the backrest support.
  • the achievable synchronous movement of seat and backrest avoids a linear movement component of the seat support. With this point synchronous mechanism, the synchronous movement of the seat occurs as a rotation around a pivot point.
  • the present mechanism is characterized in that it is particularly flat, so that a corresponding assembly requires very little space.
  • a particularly high level of seating comfort is achieved in an elegant manner in the smallest of spaces without the so-called “shirt-pulling effect” and without having to resort to complex and expensive structural solutions.
  • Mechanism 100 has a base support 1, which can be placed on a chair substructure by means of a cone mount 2, here on the upper end of a chair column 10 (see Fig 1 ) .
  • the mechanism 100 includes a substantially frame-shaped seat support 3 (see 6 , 8th ) and a backrest support 4, the cheeks 5 of which are arranged running parallel to the side walls of the base support 1.
  • the seat support 3 is provided for receiving or mounting a preferably upholstered seat (not shown).
  • the assembly is done with the help of fasteners not shown in the usual way.
  • a backrest not shown in detail, is attached to the backrest support 4, the height of which is adjustable in modern office chairs.
  • the backrest can also be connected in one piece to the backrest support 4 .
  • the entire mechanism 100 is mirror-symmetrical with respect to its central longitudinal plane. In this respect, the following description is always based on construction elements of the actual pivoting mechanism that are present in pairs on both sides, unless otherwise stated.
  • the basic position of the mechanism 100 is shown, in which the seat support 3 assumes a substantially horizontal position.
  • 2 , 4 , 7 and 8th show the mechanism 100 in a position of the backrest support 4 pivoted to the maximum backwards.
  • the base support 1 is always stationary.
  • the backrest support 4 is articulated at the pivot point 24 to the rear area 25 of the seat support 3 directly, i.e. directly and without the interposition of an additional coupling element or the like.
  • a corresponding pivot bearing is formed using a pivot axis 13 .
  • the backrest support 4 is also hinged directly to the base support 1 with its cheek 5 extending in the direction of the front seat support area 8 and can therefore be pivoted in the pivoting direction 7 about a first transverse axis 11 that defines the fixed main pivoting axis of the mechanism 100 .
  • the first transverse axis 11 is located in front of the pivot point 24 of the backrest support 4 on the seat support 3, viewed in the longitudinal direction 14 of the chair.
  • the front area 18 of the base support 1 is articulated directly at the pivot point 26 to the front area 8 of the seat support 3, ie directly and without the interposition of an additional coupling element or the like.
  • a corresponding pivot bearing is made using a pivot axis 15 educated.
  • this articulation point 26 is stationary with respect to the base support 1 and is therefore fixed, and is therefore not moved when the backrest support 4 is pivoted.
  • the pivoting mechanism described ensures that the backrest support 4 with the backrest (not shown) can be pivoted in the pivoting direction 7 about the first transverse axis 11 serving as the main pivoting axis.
  • a backwards pivoting movement of the backrest support 4 induces an immediate lowering movement of the rear area 25 of the seat support 3 and the front area 8 of the seat support 3 performs a lifting movement upwards.
  • the seat support 3 is pivoted at the same time, while the base support 1 with the axes 11, 15 remains in a fixed position.
  • the mechanism 100 has a spring mechanism for adjusting the pivoting resistance of the backrest support 4 or the backrest.
  • This spring mechanism comprises a single spring element 30 in the form of a helical compression spring which is arranged centrally in the base support 1 in the longitudinal direction 14 of the chair.
  • the spring element 30 is not in all figures, but only in 2 implied.
  • the spring element 30 acts between the backrest support 4 and the base support 1. It exerts a spring force against the rearward pivoting movement 7 of the backrest support 4. In this case, the spring element 30 is acted upon when the backrest support 4 pivots.
  • the synchronous movement (seat and backrest) takes place against a greater or lesser spring resistance.
  • the spring element 30 is supported on the one hand on a front abutment 31 and on the other hand on a rear abutment 37 with the aid of spring plates 32, 34.
  • the spring element 30 encompasses guide rods 33 which have the spring plates 32, 34 at their respective ends.
  • the spring mechanism has a spring end positioning element 45 which can be moved relative to the base support 1 and is arranged at a distance from the first transverse axis 11 .
  • the spring element 30 When the backrest support 4 pivots, the spring element 30 is loaded on one side.
  • the spring element 30 engages with its rear spring end 27, viewed in the longitudinal direction 14 of the chair, on the spring end positioning element 45, which forms the rear abutment 37, and with its front spring end 28, viewed in the longitudinal direction 14 of the chair, on the stationary base support 1, namely on the abutment 31, in that it leans against it, see 2 .
  • the rear spring end 27 is connected to the backrest support 4 at a distance from the first transverse axis 11 in order to form a rear lever arm 35 that is variable in length in the illustrated embodiment.
  • This pivot point 40 is located in an area below the first transverse axis 11.
  • the rear spring end 27 is connected to the backrest support 4 via two coupling elements 21, which on the one hand can be pivoted directly on the backrest support 4, namely about a second transverse axis 19, and on the other hand directly on are articulated to the spring end positioning element 45 .
  • the in Coupling elements 21 extending in the longitudinal direction 14 of the chair are arranged on the right and left of the spring element 30 . Only one of the coupling elements 21 is shown in each of the sectional views of the figures. Structure and function of the coupling elements 21 are described below with reference to a single coupling element 21 .
  • the spring end positioning element 45 is a cylindrical bolt on which the spring plate 34 of the spring element 30 is supported.
  • the coupling element 21 is articulated on the spring end positioning element 45 in that the spring end positioning element 45 rests rotatably in the rear end 38 of the coupling element 21 viewed in the longitudinal direction 14 of the chair.
  • the second transverse axis 19 is located in front of the rear spring end 27, viewed in the longitudinal direction 14 of the chair. In the basic position of the mechanism 100, which is not pivoted backwards, the second transverse axis 19 is also located in front of the front spring end 28 or the front abutment 31, viewed in the longitudinal direction 14 of the chair.
  • the coupling element 21 is articulated on an arm 20 of the cheek 5 which extends forward beyond the pivot point 11 in the longitudinal direction 14 of the chair.
  • the coupling element 21 is coupled to the backrest support 4 by a cylindrical bolt 16 attached between the two cheeks 5 of the backrest support 4 being rotatably supported at a coupling point 36 in the front end 39 of the coupling element 21 viewed in the longitudinal direction 14 of the chair, whereby a pivot bearing using the Bolt 16 is formed as a pivot axis.
  • the spring end positioning element 45 is connected to the backrest support 4 via the coupling element 21 in such a way that by pivoting the backrest support 4 backwards about the first transverse axis 11 in the longitudinal direction 14 of the chair, the spring end positioning element 45 is moved forward in the longitudinal direction 14 of the chair, which causes a movement of the rear spring end 27 in the direction of the front spring end 28 and thus causes the spring element 30 to be acted upon.
  • the rear spring end 27 is connected to the backrest support 4 via the coupling element 21 at a distance from the first transverse axis 11 .
  • the coupling element 21 is designed according to the invention in such a way that the spring end positioning element 45 is pulled forward in the longitudinal direction 14 of the chair by pivoting the backrest support 4 about the first transverse axis 11 backwards in the longitudinal direction 14 of the chair.
  • the rear end of the spring 27 is not acted on by pressure or thrust from behind, but rather by pulling forward.
  • the arm 20 of the backrest support 4 extends forwards in the longitudinal direction 14 of the chair beyond the position of the rear spring end 28, so that with the aid of the coupling element 21, which is articulated at this front end 47 of the backrest support 4 and extends backwards in the longitudinal direction 14 of the chair, i.e. backwards, the connected to the coupling element 21 Federendenpositionierelement 45 is taken along by the coupling element 21 and pulled forward when the backrest support 4 is pivoted backwards.
  • the front end of the spring 28 is supported with the spring plate 32 on a suitably designed support element 51 in the front region 18 of the base support 1, which forms the abutment 31, whereby a fixed, non-stationary articulation point 9 is formed.
  • the spring element 30 Since the spring element 30 is arranged in the longitudinal direction 14 of the chair, its line of action 52 also runs parallel to the longitudinal direction 14 of the chair, see FIG 2 .
  • the coupling element 21 pulls the spring end positioning element 45 forwards in the longitudinal direction 14 of the chair and thus in the effective direction 52 of the spring element 30 .
  • This type of arrangement of coupling element 21 and spring element 30 is the preferred arrangement.
  • an inclined arrangement of the coupling element 21 and/or the spring element 30 with respect to the longitudinal direction 14 of the chair would also be possible.
  • the position of the pivot point 40 of the rear end 27 of the spring element 30 on the coupling element 21 defines the length of the lever arm 35 up to the main pivot axis 11 of the mechanism 100.
  • this lever arm 35 is rotated the main pivot axis 11 is pivoted forward, whereby the rear end of the spring 27 is acted upon.
  • the position of the front spring end 28 remains unchanged.
  • the spring mechanism includes means for adjusting the spring force of the spring element 30 by changing the position of the rear spring end 27 and thus the distance between the two spring ends 27, 28. For this purpose, the distance of the rear end of the spring 27 to the first transverse axis 11 is changed.
  • two spacers 43 acting between the first transverse axis 11 on the one hand and the spring end positioning element 45 on the other serve to space the spring end positioning element 45 from the first transverse axis 11 .
  • These spacers 43 also serve to adjust the spring force of the at least one spring element 30 by being designed to change the distance between the rear end of the spring 27 and the first transverse axis 11 .
  • the spacers 43 are also arranged to the right and left of the spring element 30 . Only one of the spacers 43 is shown in each of the sectional views of the figures. The structure and function of the spacers 43 are described below using an individual spacer 43 .
  • the spacer 43 is designed in such a way that it allows a movement of the rear end of the spring 27 on a circular path with a substantially constant radius around the front end of the spring 28, whereby a "forceless" spring force adjustment is achieved.
  • the position of the rear end of the spring 27 is changed in that the spacer 43 serves as a cam carrier 44 of a cam drive.
  • the manually and/or motor-operated eccentric cam carrier 44 which is movably mounted on the backrest support 4 and is rotatably mounted about the first transverse axis 11, interacts with the spring-end positioning element 45 that serves as a scanning element of the cam drive.
  • the spring end positioning element 45 assumes the function of a cam roller, which interacts with a cam 46 of the cam carrier 44 or is in engagement. Due to the eccentricity of the spacer 43 and the resulting shape of the cam carrier 44, there are different distances between the cam 46 and the first transverse axis 11.
  • the distance between the first transverse axis 11 and the spring end positioning element 45 and thus the distance between the first transverse axis 11 and the Rear spring end 27 can be changed in this way by rotating spacer 43 about first transverse axis 11 .
  • the spring end positioning element 45 runs on one side, as shown, on the cam 46 against which it is pressed by the at least one spring element 30 .
  • the spring end positioning element 45 is connected to the rear end of the spring 27, in the example described here in that the rear end of the spring 27 is supported on it.
  • spacer 43 designed as an eccentric
  • a differently designed spacer can also be used, as long as it is capable of changing the distance between the spring end positioning element 45 and the first transverse axis 11 in the desired manner.
  • the spacer 43 is not itself designed as a cam disk 44, but rather a cam disk 44 that interacts with the spacer 43 is provided, which can be moved in the desired manner together with the spacer 43 or with the aid of the spacer 43.
  • the spacer 43 or the cam disk 44 only serves to support the spring end positioning element 45 or, in other words, only to secure the position of the spring end positioning element 45.
  • the spring end positioning element 45 is not acted upon by the spacer 43 or the cam disk 44 during a pivoting of the backrest support 4.
  • the loading of the spring end positioning element 45 takes place exclusively through the coupling element 21, in that this pulls the spring end positioning element 45 forward. If the coupling element 21 pulls the spring end positioning element 45 forward when the backrest support 4 is pivoted, the fact that the spring end positioning element 45 rests against the spacer 43 causes the spacer 43 to pivot about the transverse axis 11, so that the spacer 43 follows the pivoting movement of the backrest support 4.
  • a plurality of troughs are provided on the edge of the cam carrier 44 defining the course of the curve 46, which troughs determine the local course of the curve 46, including a rearmost trough 48 and a foremost trough 49, see FIG 3 , 4 .
  • This attached to defined points of the curve troughs 46 ensure a sufficiently large self-locking, so a sufficient resistance to slipping of the Spring end positioning element 45 on curve 46.
  • Spring end positioning element 45 thus remains in place, even if, in order to achieve the shortest possible adjustment path when setting the spring force of spring element 30, a cam carrier 44 is used, which has a curve 46 with the steepest possible rise, i.e. a steep curve angle.
  • troughs allow the spring force to be adjusted in stages, which is often considered advantageous from the user's point of view, since the adjustment of the rear spring end 27 is associated with a more or less strong engagement of the spring end positioning element 45 in the respective trough, whereby the user receives tactile feedback about a successfully completed adjustment process.
  • an embodiment with a continuously smooth curve edge is also possible.
  • the spring end positioning element 45 lies in the foremost trough 49 of the curve 46 .
  • the effective lever arm 35 from the pivot point 40 of the spring element 30 to the main pivot axis 11 of the mechanism 100 is the longest. In this position, the pivot point 40 of the spring element 30 must cover a greater distance for the same pivoting angle of the backrest support 4. In other words, the suspension travel is longer. For this reason, the spring element 30 is compressed more. The pivoting resistance and thus also the restoring torque of the backrest support 4 are greater.
  • the spring element 30 already has the greatest hardness at the beginning of the pivoting process, without a pivoting of the backrest support 4 is necessary.
  • the Federendenpositionierelement 45 in the rearmost trough 48 of the curve 46 is the Federendenpositionierelement 45 in the rearmost trough 48 of the curve 46.
  • the effective lever arm 35 is shorter, the spring deflection and thus the pivoting resistance and the restoring torque are correspondingly lower.
  • the spring preload of the spring element 30 is not changed.
  • the initial resistance of the backrest support 4 changes with a change in the pivoting resistance. The "harder" the setting, the greater the initial force to be applied by the user for pivoting the backrest support 4 .
  • the rotation of the spacer 43 in the direction of actuation 50 can be done by means of a manually operable handle (not shown), for example with a rotary handle or a handwheel.
  • This handle is preferably mounted on the backrest support 4, with the axis of rotation of an advantageously used handwheel coinciding with the rear transverse axis 11, so that a user-friendly direct transmission of the rotation of the handwheel to the spacer 43 takes place without a linear operating movement being converted into a rotary movement beforehand of the spacer 43 must take place.
  • the spacer 43 can also be driven via levers, Bowden cables, etc., or an operating movement is transmitted from a handle whose axis of rotation is remote from the transverse axis 11 to the spacer 43 with the aid of transmission elements, such as gear wheels and the like.
  • an (electric) motor drive can be provided.
  • a large or small curved carrier 44 can be used.
  • a curve 46 with a slight or steep gradient can also be used.
  • the adjustment characteristic of the pivoting resistance can be adjusted by the selection of the curve 46, in particular by the decision as to whether a curve 46 with a constant or variable slope is used.
  • the spring element 30 and the coupling element 21 are preferably arranged in the mechanism 100 in such a way that the line of action 52 of the spring element 30 does not coincide with the pulling direction 53 of the coupling element 21 .
  • the lines of action 52, 53 of the spring element 30 and the coupling element 21 are spaced apart from one another.
  • the line of action 52 of the spring element 30 and the central longitudinal axis of the coupling element 21, which here coincides with the pulling direction 53, are never parallel to one another.
  • these components are preferably arranged in such a way that the second transverse axis 19, which can be moved together with the backrest support 4, is always at a distance from the stationary pivot point 9, at which the spring element 30 is attached to the base support 1 is supported, in particular above this pivot point 9 is located.
  • the resulting force acting on the spring end positioning element 45 is in 3 indicated with arrow 54.
  • the spring end positioning element 45 is always pressed slightly against the spacer 43 because the lines of action 52, 53 have an angular offset, which causes a force component acting on the spring end positioning element 45 and directed upwards in the direction of the spacer 43.
  • the use of an additional spring element that acts on the spring end positioning element 45 from below in the direction of the spacer 43 and the use of alternative safety measures can be dispensed with.
EP22020113.1A 2021-03-26 2022-03-17 Système mécanique pour une chaise Pending EP4115768A1 (fr)

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DE102021107681.1A DE102021107681A1 (de) 2021-03-26 2021-03-26 Mechanik

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EP4115768A1 true EP4115768A1 (fr) 2023-01-11

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EP22020113.1A Pending EP4115768A1 (fr) 2021-03-26 2022-03-17 Système mécanique pour une chaise

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EP (1) EP4115768A1 (fr)
CN (1) CN115120053A (fr)
DE (1) DE102021107681A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016124317A1 (fr) * 2015-02-03 2016-08-11 Bock 1 Gmbh & Co. Kg Mecanisme synchrone
US9974389B2 (en) * 2014-12-19 2018-05-22 Hangzhou Zhongtai Industrial Group Co., Ltd. Adjusting mechanism for adjusting a restoring force acting on the backrest of a chair, and office chair provided with such an adjusting mechanism
DE102019113581A1 (de) * 2019-05-21 2020-11-26 Bock 1 Gmbh & Co. Kg Synchronmechanik

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9974389B2 (en) * 2014-12-19 2018-05-22 Hangzhou Zhongtai Industrial Group Co., Ltd. Adjusting mechanism for adjusting a restoring force acting on the backrest of a chair, and office chair provided with such an adjusting mechanism
WO2016124317A1 (fr) * 2015-02-03 2016-08-11 Bock 1 Gmbh & Co. Kg Mecanisme synchrone
DE102019113581A1 (de) * 2019-05-21 2020-11-26 Bock 1 Gmbh & Co. Kg Synchronmechanik

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DE102021107681A1 (de) 2022-09-29
CN115120053A (zh) 2022-09-30

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