Back support module, backrest and chair

Abstract

The invention relates to a back support module (1) for a backrest (51) of a chair (5), comprising a slatted device (2), a main axle (4), a main rocker (31) and at least one secondary rocker (32). The slatted device (2) has a plurality of slats (211). During use of the back support module (1), the main axle (4) is oriented more or less horizontally. The main rocker (31) is a main rocker (31) which can be fastened, via the main axle (4), to a frame structure (512) of the backrest (51) in a tiltable manner. The main rocker has two end regions arranged on opposite sides of the main axle (4). The secondary rocker (32) is fastened in a tiltable manner to a first of the two end regions of the main rocker (31) via a first secondary axle (33) extending more or less parallel to the main axle (4). The secondary rocker has two end regions (34) arranged on opposite sides of the first secondary axle (33). One slat (211) of the slatted device (2) is in each case mounted in a tiltable manner on the two end regions (34) of the first secondary rocker (32).

Description

DESCRIPTION title BACK SUPPORT MODULE, BACKREST AND CHAIR Technical area

[0001] The invention relates to a back support module according to the preamble of independent claim 1, a backrest according to the preamble of independent claim 11 and a chair with such a backrest.

[0002] Backrests of the above type are equipped with a frame structure and a slat device having a plurality of slats and can be used to ergonomically support a back, in particular during use of a chair. State of the art

[0003] Office workstations and other workplaces often use chairs that are adjustable in various ways. For example, the distance between a chair leg and a chair seat is typically adjustable using a specific device, allowing the seat height to be tailored to the individual user. The seat depth of many chairs can also be adjusted. Chairs can also be swiveled and their seat and backrest angle can be adjusted. Since people in offices often sit at a desk for extended periods of time, for example, the adjustability of chairs is of great importance for ergonomic reasons.

[0004] Chair backrests can include a support structure that typically supports the back at different backrest angles. Since the shape of users' spines varies greatly, customized support, especially in the lumbar region, is essential for ergonomic and comfortable sitting.

[0005] For this purpose, chairs are often equipped with an adjustable lumbar support, which allows the support of the user's lumbar region to be individually adjusted. This can be particularly important, as the individuality of different users is typically comparatively high in the lumbar region. Such lumbar supports are typically curved to match the curved shape of the lumbar region of the spine or back.

[0006] To adapt to the individual needs of a user, these lumbar supports can be adjusted in terms of the height of their curvature. This allows the curvature to be positioned at the correct location, providing ergonomic and comfortable support.

[0007] Although lumbar supports are known that can be conveniently adjusted to suit the individual user of the chair, such lumbar supports are often still not adjusted correctly in daily practice. This can be due to users not having sufficient knowledge of how the lumbar region of their back is ideally supported, adjusting the lumbar support is comparatively complicated, or the adjustment is inconsistent or depends on the specific chair. Secondly, it can be too time-consuming for users to adjust the lumbar support correctly every time, especially if they change chairs frequently. Furthermore, it can also be advantageous if the lumbar support is adjusted when the backrest angle changes, so that the back is appropriately supported in different positions.

[0008] The object of the following invention is therefore to propose a backrest or a component thereof, or a chair, which ensures that the backrest is adjusted to suit a user. In particular, it is desirable to ensure that backrests are adjusted in such a way that the user's lumbar region is ergonomically supported. Description of the invention

[0009] The object is achieved according to the invention by a back support module as defined by the features of independent claim 1, by a backrest as defined by the features of independent claim 12, and by a chair as defined by the features of independent claim 37. Advantageous embodiments of the invention emerge from the dependent claims.

[0010] In one aspect, the invention is a back support module for a chair backrest with a slat device, a main axis, a main rocker, and a secondary rocker. The slat device has a plurality of slats. When the back support module is used, the main axis can be aligned virtually horizontally. The main rocker can be tiltably attached to a frame structure of the backrest via the main axis. It has two end regions arranged on opposite sides of the main axis. The secondary rocker is tiltably attached to a first of the two end regions of the main rocker via a first secondary axis running virtually parallel to the main axis. It has two end regions arranged on opposite sides of the first secondary axis. One slat of the slat device is tiltably mounted on each of the two end regions of the first secondary rocker.

[0011] The back support module can be designed as a single unit that can be efficiently installed. In particular, it can be a lumbar support as a single component that can be conveniently manufactured and efficiently installed in a backrest.

[0012] The frame structure of the backrest, for which the back support module is intended, can comprise spars or struts that ensure a more or less stable shape of the backrest. It can also have or be a shell or a similar element. In particular, it can stabilize the backrest and give it a desired basic shape and orientation. Preferably, the orientation of the backrest in a chair is adjustable or changeable. Typically, the orientation of the backrest is virtually upright in an unloaded basic or zero position.

[0013] The application of the back support module corresponds to supporting the back of a chair user. For this purpose, the back support module is typically built into the backrest of the chair. The back support module can be arranged to support the entire back or one or more areas of it. In particular, the back support module can be a lumbar support. Such lumbar supports in chairs typically support the lower areas of the back. This allows for ergonomic support of the lumbar spine, particularly at the level of the lumbar region. This area of ​​the back can cause problems when sitting, especially if the posture is incorrect for a relatively long period of time.

[0014] The main axis and the secondary axis define the movements of the main rocker and the secondary rocker and prevent the rockers from moving in an indeterminate or uncontrolled manner. In particular, the main and / or secondary axes can limit the movement of the main or secondary rocker to a tilting movement. Tilting movements around other axes or points can also be prevented.

[0015] The slats can be arranged on the secondary rocker in a tiltable manner, allowing them to be moved around an axis that is also virtually parallel to the main axis. Compared to tilting movements around the main and secondary axes, tilting the slats relative to the secondary rocker can be more flexible or variable.

[0016] The two rockers allow the back support module to automatically adjust to the shape of the user's back. The user can simply lean against the backrest equipped with the back support module, and the movement of the two rockers automatically positions and aligns the slats to adapt to the shape of the back. In particular, the tilting movements of the two rockers capture and map the natural, individual curvature of the spine in the user's lumbar region. In this way, the user's back can be automatically ergonomically supported without the need for any adjustments. The back support module thus enables the provision of automatic lumbar support.

[0017] The back support module according to the invention thus makes it possible to provide a chair backrest that automatically adjusts its shape to the user's back. This ensures that the backrest is always adjusted to provide ergonomic support for the user's back, and in particular, their lumbar region.

[0018] The back support module preferably comprises a second secondary rocker pivotably mounted on a second of the two end regions of the main rocker via a second secondary axis running virtually parallel to the main axis. The second secondary rocker has two end regions arranged on opposite sides of the second secondary axis, with a slat of the slat device pivotably mounted on each of the two end regions of the second secondary rocker. With a second secondary rocker, the back, and in particular its lumbar region, can be particularly advantageously positioned, thus improving the ergonomics of the support.

[0019] The main rocker and one or two secondary rockers form two rocker layers or rocker levels that can efficiently replicate the curvature of the lumbar region of the back. In particular, the two rocker layers allow the curvature to be replicated while still allowing the slats to be sufficiently large to provide comfortable and efficient support.

[0020] In addition to the two rocker levels, further rocker levels can also be provided. For example, a third rocker level can be implemented as follows. The back support module comprises one or more third rockers tiltably attached to one of the two end regions of one of the secondary rockers via a third axis running virtually parallel to the main axis. The third rockers have two end regions arranged on opposite sides of the second third axis, with one slat of the slat device tiltably mounted at each of the two end regions of the third rocker. In such an embodiment, the slats are thus mounted directly on the third rocker and indirectly on the associated secondary rocker.

[0021] Preferably, the main rocker and the first secondary rocker are molded as a single plastic component. In the context of the invention, the term "single-piece" refers to a one-piece construction. A one-piece element can consist of several different, but firmly or permanently connected, parts. Preferably, however, one-piece elements are designed to be quasi-monolithic or made of a single, uniform material.

[0022] Main and secondary rockers in one piece or as one element or unit enable simple and efficient production and a robust Construction. For example, the rockers can be manufactured in a single step as an injection-molded part.

[0023] The plastic component preferably has a material taper or a shape between the main rocker and the first secondary rocker, and optionally the second secondary rocker, which forms the first secondary axis. Such an integrated secondary axis can be a particularly simple design of the secondary axis that can be manufactured efficiently.

[0024] The plastic component is preferably plate-shaped, with the first secondary axis and, if applicable, the second secondary axis each being formed or implemented by a film hinge provided in the plastic component. Such film hinges can be a particularly efficient implementation of the secondary axis molded into the plastic component.

[0025] The louvre assembly can be a collection of individual or connected louvres. Preferably, however, it is formed as a single piece. Such a single-piece or one-part louvre assembly can be efficiently manufactured and installed. Furthermore, a one-part design allows the louvres to be stabilized relative to one another and to move interdependently or in a coordinated manner.

[0026] The slat device preferably comprises a plate-like plastic body which is provided with a plurality of slots, wherein the slats are formed adjacent to or between the slots.

[0027] In this context, the term "plate-like" refers to a quasi-flat or planar body whose surface area is greater than its thickness or width. The plate-like body can exhibit a certain degree of dimensional stability, thus distinguishing itself from a film-like or cloth-like structure. It can also be elastic, so that after being deformed by the application of force, it returns, at least to a certain extent, to its original, for example, planar shape when no forces are acting on it.

[0028] Such a slat device enables the slats to be connected to each other laterally, thus stabilizing them and allowing them to move independently of each other. move or align. Furthermore, such a design of the slat device, with slats produced via slots, can enable particularly simple and efficient production of the slat device. For example, the slat device can consist of a single injection-molded part. Furthermore, the plate-like construction allows the slat device to be relatively flat and thus easily and space-savingly installed into a backrest.

[0029] The slots in the plate-like plastic body are preferably essentially straight. Such a slot design allows for the efficient creation of straight slats. Such straight slats can be particularly effective for supporting at separate, different heights.

[0030] The plate-like plastic body preferably has an extension section. When installed, the extension section can extend upwards from the slats.

[0031] The extension region of the plate-like plastic body preferably has an upper end section which can be fastened to the frame structure.

[0032] The extension region of the plate-like plastic body preferably has additional slots, which preferably run from bottom to top in an installed state. The additional slots in the extension region of the plate-like plastic body are preferably designed to be substantially rectilinear.

[0033] The slat device is preferably made of an elastic plastic. The plastic body can, in particular, be made of a material that is softer or more flexible than the material of the rockers. Such a plastic allows for comfortable support of the user's back. Among other things, the elastic plastic can prevent uncomfortable pressure points, for example, along the edges of the slats.

[0034] The longitudinal ends of the slats are preferably connected to one another by a reinforcement region of the slat device. In this way, the slats can be stabilized relative to one another and can align themselves independently of one another. The tiltability or tilt resistance of the slats can be defined. In a slotted, plate-like plastic body, the reinforcement area can be realized by side sections that are not slotted.

[0035] The main axis can, in particular, be a physical component or a structure physically provided on a component. The main axis is preferably designed as a rod. Such a rod enables the provision of a stable axis that precisely defines and limits the movement of the main rocker. A rod can also be efficiently designed to be sufficiently robust so that it can withstand relatively high loads. In particular, it can thus withstand forces occurring in backrests without its function being impaired. The rod can be made of a relatively strong material, such as metal or a robust plastic.

[0036] To support the rod, a backrest frame structure can be equipped with a support bearing in an installed state, into which the rod is inserted or snapped and held. Alternatively, the main axis can include a rod holder into which the rod can be snapped or inserted. The rod holder can be designed for practical installation in a chair. For example, it can be connected to the backrest frame structure.

[0037] In another aspect, the invention is a backrest for a chair comprising a frame structure, a slat device, a main rocker, and a secondary rocker. The slat device has a plurality of slats. The main rocker is tiltably attached to the frame structure via a quasi-horizontal main axis. In particular, it can be mounted immovably on the frame structure in the vertical direction. It has two end regions arranged on opposite sides of the main axis. The first secondary rocker is tiltably attached to a first of the two end regions of the main rocker via a quasi-horizontal first secondary axis. The first secondary rocker has two end regions arranged on opposite sides of the first secondary axis. One slat of the slat device is tiltably mounted on each of the two end regions of the first secondary rocker.

[0038] The frame structure can include spars or struts that ensure a more or less stable backrest shape. It can also have a shell or a similar element. This can, in particular, stabilize the backrest and give it a desired basic shape and orientation. Preferably, the backrest orientation in a chair is adjustable. Typically, the backrest is virtually upright in its unloaded, basic, or zero position.

[0039] With the backrest according to the invention and its preferred embodiments described below, the effects and advantages of the back support module according to the invention and its preferred embodiments can be efficiently implemented. In particular, such a backrest can be easily installed in a chair, thus providing automatically adjustable lumbar support.

[0040] In order to avoid repetition, in connection with the effects of the preferred features of the backrest according to the invention described below, which are also preferred in an analogous manner for the back support module according to the invention, reference is made to the above description of the preferred embodiments of the back support module.

[0041] Preferably, the backrest comprises a second secondary rocker which is tiltably attached to a second of the two end regions of the main rocker via a quasi-horizontal second secondary axis and which has two end regions arranged on opposite sides of the second secondary axis.

[0042] Preferably, the backrest includes an alignment element that moves the main rocker to a home position when the backrest is not under load. This ensures that the backrest or its lumbar support is always in the home or zero position when not under load or in use.

[0043] The alignment element is preferably elastic and arranged between the main rocker and the frame structure. For example, it can be designed as a foam element or as a relatively soft spring. Preferably, the spring force or elasticity is just strong enough to The lumbar support or backrest can be set to the zero position. This ensures that the lumbar support is automatically adjusted safely and comfortably for each new use.

[0044] The slat structure can be designed as a separate component, for example with a plate-like body as described below, or integrated into another component of the backrest.

[0045] In a preferred embodiment, the backrest comprises a cover pulled over the frame structure, wherein the slats of the slat device are arranged in the cover. The cover can be any flexible or cloth-like cover intended to accommodate a user's back. It is preferably made of a textile material, for example, woven or knitted. The cover can in particular be stretched onto or into the frame structure. The slats can, for example, be inserted into pockets in the cover or sewn into the cover. Or they can be attached to the cover in another way, such as glued or welded.

[0046] In an alternative preferred embodiment, the backrest comprises a cover pulled over the frame structure, wherein the slats of the slatted device are designed as reinforced areas of the cover. Such reinforced areas can be provided, for example, as thickened portions and / or as densely woven sections in the cover. In this way, the slatted device can be implemented efficiently and in a space-saving manner.

[0047] Preferably, the main rocker and the first secondary rocker are integrally formed as a plastic component.

[0048] The plastic component between the main rocker and the first secondary rocker preferably has a material taper or a shape which forms the first secondary axis.

[0049] The plastic component is preferably plate-shaped, wherein the first secondary axis is implemented or formed by a film hinge provided in the plastic component.

[0050] Preferably, the slat device is formed in one piece.

[0051] The slat device preferably comprises a plate-like plastic body equipped with a plurality of slots, with the slats formed adjacent to or between the slots. The slots are preferably designed to be substantially rectilinear.

[0052] The plate-like plastic body preferably has an extension section extending upward from the slats. This extension section can support a portion of a user's back above the lower back or above a lumbar region. This can increase the comfort of the backrest. Furthermore, additional support of the back above the lumbar region can be avoided by additional means, thus enabling a comparatively simple and efficient design.

[0053] The extension region of the plate-like plastic body preferably has an upper end section that is attached to the frame structure. In this way, the plate-like plastic body can be held preferably and securely in its intended position in the backrest.

[0054] The extension section of the plate-like plastic body preferably has additional slots. Such additional slots allow the elasticity or mobility of the extension section to be adapted to the characteristics of the user's back above the lumbar region. This allows for particularly comfortable leaning or support.

[0055] The additional slots in the extension section of the plate-like plastic body preferably run from bottom to top. The slots can be vertical or angled, such as diagonal. Such slots enable efficient and comfortable back support in many applications.

[0056] The further slots of the extension region of the plate-like plastic body are preferably designed to be substantially straight.

[0057] Preferably, the plate-like plastic body is attached to the frame structure below the slats. This is especially true if the plastic body is also attached above the slats, for example, at its extension area on the frame structure, efficient and precise positioning of the support structure in the backrest can be ensured.

[0058] Preferably, the frame structure comprises or is a shell. Such a shell can be a dimensionally stable component that is particularly rigid compared to the slatted structure or the plastic body. The shell can provide stability to the backrest and also hold and protect the supporting structure components.

[0059] The slat device is preferably made of an elastic plastic.

[0060] The longitudinal ends of the slats are preferably connected to one another by a reinforcing region of the slat device.

[0061] Preferably, the main axis is designed as a rod. Such a rod can, for example, be securely mounted in or on the frame structure. For example, the frame structure can be equipped with a support bearing into which the rod is inserted or snapped and held. Alternatively, a rod holder connected to the frame structure can be provided.

[0062] The backrest preferably includes a cover that covers the slatted structure, the main axis, the main rocker, the first secondary axis, and the secondary rocker. The cover can be made of textile, cloth, or foil. It allows the backrest to be enclosed, provides an aesthetic appearance, and ensures comfortable support for the user's back.

[0063] Preferably, the backrest comprises a back support module according to the invention as described above or a preferred embodiment thereof as described above.

[0064] In another aspect, the invention is a chair having a seat and a backrest according to the invention or a preferred embodiment thereof as described above.

[0065] With the chair according to the invention, the effects and advantages of the backrest according to the invention and its preferred embodiments can be efficiently implemented. Short description of the drawings

[0066] Further advantageous embodiments of the invention will become apparent from the following description of exemplary embodiments of the invention with the aid of the schematic drawing. In particular, the back support module according to the invention, the backrest according to the invention, and the chair according to the invention are described in more detail below with reference to exemplary embodiments in the accompanying drawings. They show: Fig. 1 is a perspective rear view of a first embodiment of a back support module according to the invention; Fig. 2 is a perspective front view of the back support module of Fig. 1; Fig. 3 is a front view of the back support module of Fig. 1; Fig. 4 is a sectional view along the line BB of Fig. 3; Fig. 5 is a sectional view along the line CC of Fig. 3; Fig. 6 is a schematic side view of an embodiment of a chair according to the invention with an embodiment of a backrest according to the invention with the back support module of Fig. 1, the backrest being shown partially in section; Fig. 7 is a side view of the chair of Fig. 6 with a first user; and Fig. 8 is a side view of the chair of Fig. 6 with a second user; Fig. 9 is a perspective rear view of a second embodiment of a back support module according to the invention; and Fig. 10 is a front view of the back support module of Fig. 9. Way(s) of carrying out the invention

[0067] Certain terms are used in the following description for convenience and are not to be construed as limiting. The words "right," "left," "bottom," and "top" indicate directions in the drawing to which reference is made. The terms "inward," "outward," "below," "above," "left," "right," or similar terms are used to describe the relative arrangement of designated parts, the relative movement of designated parts, and the directions toward toward or away from the geometric center of the invention, as well as designated parts thereof, as shown in the figures. These spatial relative terms also include positions and orientations other than those shown in the figures. For example, if a part shown in the figures is turned over, elements or features described as "below" are then "above." The terminology includes the words expressly mentioned above, derivatives of the same, and words of similar meaning.

[0068] In order to avoid repetitions in the figures and the associated description of the various aspects and embodiments, certain features should be understood as being common to different aspects and embodiments. The omission of an aspect in the description or a figure does not imply that this aspect is missing in the associated embodiment. Rather, such omission can serve to increase clarity and avoid repetitions. In this context, the following stipulation applies to the entire further description: If reference symbols are included in a figure for the purpose of graphic unambiguity but are not mentioned in the immediately associated descriptive text, reference is made to their explanation in preceding figure descriptions.If the descriptive text directly associated with a figure contains reference symbols that are not included in the corresponding figure, reference is made to the preceding and subsequent figures. Similar reference symbols in two or more figures represent similar or identical elements.

[0069] Fig. 1 shows a perspective rear view of a first embodiment of a back support module 1 according to the invention, comprising a slat device 2, a rocker device 3, and a main axis 4. The main axis 4 is oriented horizontally. It includes a rod holder 42 designed to be fixedly mounted to a component of a backrest.

[0070] The slat device 2 comprises an elastic plastic plate 21 as a plate-like plastic component. The plastic plate 21 is equipped with three continuous slots 214, which run horizontally parallel to each other over long distances. The slots 214 form four parallel horizontal slats 211. Laterally, the plastic plate 21 is formed continuously or unprotected, so that the plastic plate 21 is closed off laterally by a reinforcement area 213. On their rear sides, each of the slats 211 is provided with a bar-shaped and horizontally extending slat reinforcement 212.

[0071] The rocker device 3 comprises a main rocker 31 and a first and a second secondary rocker 32. The main rocker 31 is connected to the main axis 4 and has two end regions located opposite the main axis 4. Each of the two end regions of the main rocker 31 transitions into one of the two secondary rockers 32 via a secondary axis 33 running parallel to the main axis 4.

[0072] The main rocker 31 and the two secondary rockers 32 are integrally molded as a substantially plate-shaped plastic component. The plastic component is made of a virtually dimensionally stable plastic that is harder than the plastic from which the plastic plate 21 of the slat device 2 is made. The secondary axes 33 are each formed by a film hinge created by tapering the material.

[0073] The two secondary rockers 32 each comprise a U-shaped main section and two end sections arranged on opposite sides of the associated first secondary axis 33. The end sections each define a connecting section 34, extend at an angle to the main sections via a film hinge, and each extend toward one of the slats 211. The four connecting sections 34 are each mounted on one of the four slat reinforcements 212.

[0074] Fig. 2 shows the back support module 1 in perspective from the front. It can be seen that the main axis 4 comprises an axle rod 41 that is rotatably mounted in the rod holder 42. The axle rod 41 is also connected to the main rocker 31 in a rotationally fixed manner, so that the main rocker 31, together with the two secondary rockers 32, can be tilted about the main axis 4. In particular, the axle rod 41 mounted in the rod holder 42 precisely defines the possible movement of the main rocker 31 relative to the main axis 4, namely a rotational movement about the axle rod 41. Other movements of the main rocker 31 relative to the main axis 4 are excluded, apart from any play that may be present. In this way, a defined and precise movement of the rocker device 3 relative to the rod holder 42 and thus to components that are firmly connected to it can be achieved.

[0075] As best seen in the front view of the back support module in Fig. 3, the three horizontal slots 214 are parallel to each other. In particular, they each run predominantly straight at the same height. At their longitudinal ends, they have short vertical sections extending upwards and downwards. The shape and circumference of the slots 214 allow for the formation of four parallel, horizontally arranged slats 211 in the plastic plate 21, each of which exhibits a suitable degree of flexibility or elasticity.

[0076] Fig. 4 shows the back support module 1 in a sectional view along line BB of Fig. 3. It can be seen that the connecting regions 34 and the main region of the two secondary rockers 32 are quasi-U-shaped in cross-section. At their ends associated with the slats 211, the connecting regions 34 are each equipped with a head with a round cross-section, which is inserted into a corresponding receptacle of the associated slat reinforcement 212 and is thus connected to it. Via this connection, the slats 211 are each arranged so as to be tiltable relative to their associated connecting regions 34 about a slat tilt axis 35 predetermined by the head.

[0077] The rod holder 42 of the main axis 4 has a gripping receptacle into which the axis rod 41 is reversibly snapped. When using the back support module 1, the rod holder 42 is attached to a component of a backrest, and the remaining back support module 1 can be snapped onto the axis rod 41 and thus reversibly mounted to the backrest.

[0078] Fig. 5 shows the back support module 1 in a sectional view along line CC of Fig. 3. It can be seen that the axle rod 41 extends laterally beyond the main rocker 31. At the sections extending beyond the main rocker 31, the axle rod 41 is snapped into the rod holder 42. In the area of ​​the main rocker 31, the axle rod is embedded in the main rocker 31 and is thus fixedly and, in particular, rotationally fixedly connected to it.

[0079] The secondary axes 33 are each formed as a film hinge by means of material tapers on both sides. The film hinges define a tilting movement of the secondary rockers 32 relative to the main rocker 31. In particular, the material properties of the plastic from which the Rocker device 4 is manufactured, a suitable tilting or twisting of the secondary rockers 32.

[0080] Fig. 6 shows an embodiment of a chair 5 according to the invention with an embodiment of a backrest 51 according to the invention and a seat 52. The seat 52 is any upholstered or unupholstered seat 52 as is conventionally used in chairs and in particular office chairs.

[0081] The backrest 51 comprises the back support module 1 as a lumbar support, wherein the back support module 1 is shown only schematically in Figs. 6, 7, and 8 to illustrate its movement when the chair 5 is in use. Furthermore, the backrest 51 has a frame structure with a shell 512 and a textile cover 511. The rod holder 42 of the back support module 1 is firmly mounted on the shell 512, so that the main axis 4 and in particular its axis rod 41 are aligned substantially horizontally. The textile cover 511 is stretched over the laterally curved shell 512 and covers the back support module 1.

[0082] The backrest 5 further comprises an alignment element 7, which is mounted on the shell 512 and positioned between the shell 512 and the main rocker 31. The alignment element 7 is made of an elastic plastic. It is designed to move the main rocker 31 into a quasi-vertical home position when the backrest 51 is not loaded.

[0083] A first user 6 sits on the chair 5 in such a way that his buttocks are supported by the seat 52 and his back is supported by the backrest 51. The back support module 1 is attached to the shell 512 at a height of the backrest 51 such that the back support module 1 lies in a lumbar region 61 of the user.

[0084] As shown in Fig. 7, the lumbar support or back support module 1 automatically adapts to the shape of the lumbar region 61 of the first user 6 when the user leans against the backrest 51. In particular, with the predetermined shape of the lumbar region 61, the main rocker 31 is tilted from bottom to top toward the rear. In other words, the main rocker 31 is tilted clockwise around the main axis 4, starting from a zero position in which the main rocker 31 and both secondary rockers 32 are essentially vertically aligned. The main rocker 31 is moved away from the alignment element 7 and spaced apart. The upper secondary rocker 32 is tilted clockwise around the corresponding upper secondary axis 33 more than the main rocker 31. In contrast, the lower secondary rocker 32 is tilted counterclockwise around the corresponding secondary axis 33, starting from the zero position.

[0085] By tilting the main and secondary rockers 31, 32 accordingly, the slats 211 are positioned according to the shape of the lumbar region 61 of the first user 6, with the slats 211 additionally tilted about their associated slat axes 35 to adapt to this shape. Thus, the lumbar support of the backrest 51 is automatically adjusted to the first user 6 when the user 6 sits on the chair 5 and leans against the backrest 51. Manual adjustment of the lumbar support or the back support module 1 is not required; the lumbar region 61 of the first user 6 is appropriately supported.

[0086] Fig. 8 shows the chair 5 with a second user 60 sitting on it, who is taller than the first user 6. The second user 60 contacts the lumbar support 1 at a different point on the back than the first user 6, in particular at a comparatively flat point on his lumbar region 610. Accordingly, with this shape of the lumbar region 610, the main rocker 31 is tilted from bottom to top towards the front. In other words, the main rocker 31 is tilted counterclockwise around the main axis 4, starting from the zero position. The main rocker 31 is moved towards the alignment element 7 and compresses it to a certain extent. The upper secondary rocker 32 and the lower secondary rocker 32 are virtually in line with the main rocker 31 and thus not significantly tilted around the secondary axes 33. However, the slats 211 are tilted about their associated slat axes 35 to adapt to the shape of the lumbar region 610 of the second user 60.

[0087] Fig. 9 shows a perspective rear view of a second embodiment of a back support module 10 according to the invention with a slat device 20, a rocker device 30 and a main axis 40. The back support module 10 is partially designed analogously to the back support module 1 of Figs. 1 to 9.

[0088] The main axis 40 is oriented horizontally. It includes a rod support 420 designed to be rigidly mounted to a frame structure, such as, in particular, a shell of a chair backrest.

[0089] The slat device 20 comprises an elastic plastic plate 210 as a plate-like plastic component. A lower lumbar region of the plastic plate 210 is provided with three continuous slots 2140 that run horizontally parallel to each other over long distances. The slots 2140 form four parallel horizontal slats 2110. Laterally, the plastic plate 210 is formed continuously or unprotected, so that the plastic plate 210 is laterally closed off in its lumbar region by a reinforcement region 2130. On its rear side, each of the slats 2110 is provided with a bar-shaped, horizontally extending slat reinforcement 2120.

[0090] The plastic plate 210 further comprises an extension region 2150, which extends upward from the slats 2110 or from the lumbar region. At an upper end section, the extension region 2150 is equipped with two mounting parts 80, via which it can be attached to the frame structure or shell of the backrest. Furthermore, the extension region 2150 of the plastic plate 210 is equipped with additional slots 2160.

[0091] As can be clearly seen in particular in Fig. 10, the extension region 2150 comprises four rows of further slots 2160. The lower three rows have four further slots 2160 and the uppermost row has two further slots 2160. The further slots 2160 of the extension region 2150 are rectilinear and all run approximately vertically from bottom to top.

[0092] Fig. 9 further shows that the rocker device 30 comprises a main rocker 310 and a first and a second secondary rocker 320. The main rocker 310 is connected to the main axis 40 and has two end regions located opposite the main axis 40. Each of the two end regions of the main rocker 310 transitions into one of the two secondary rockers 320 via a secondary axis 330 running parallel to the main axis 40.

[0093] The main rocker 310 and the two secondary rockers 320 are formed as a single piece, essentially plate-shaped and profiled plastic component. The plastic component is made of a virtually dimensionally stable plastic and is equipped with reinforcing struts via the profiling. The plastic used here is harder than the plastic from which the plastic plate 210 of the slat device 20 is made. The secondary axes 330 are each formed by a film hinge created by tapering the material.

[0094] The two secondary rockers 320 each comprise a U-shaped main region and two end regions arranged on opposite sides of the associated first secondary axis 330. The end regions each define a connecting region 340, extend at an angle to the main regions via a film hinge, and each extend toward one of the slats 2110. The four connecting regions 340 are each mounted on one of the four slat reinforcements 2120.

[0095] The back support module 10 can be installed in a backrest similar to that shown in Figs. 6 to 8, whereby the optional alignment element can be omitted. In particular, the back support module can be arranged in the backrest such that the lumbar region of the plastic plate 210 lies in the area of ​​the user's lower back or the small of the back. The extension region 2150 can be located above the user's lower back, so that it can comfortably support them.

[0096] Although the invention is illustrated and described in detail by means of the figures and the associated description, this illustration and this detailed description are to be understood as illustrative and exemplary and not as limiting the invention. In order not to obscure the invention, in certain cases well-known structures and techniques may not be shown and described in detail. It is understood that those skilled in the art can make changes and modifications without departing from the scope of the following claims. In particular, the present invention covers further embodiments with any combinations of features that may deviate from the explicitly described combinations of features. For example, the invention can also be implemented in the following form: The main axis can be realized by an elastic material so that the main rocker can be bent around it in order to be tilted.The secondary axes can be formed by respective axle rods. In addition to the main rocker and the secondary rockers, additional rockers or sub-rockers can be provided. so that the shape of the back can be ideally accommodated. The back support module can extend beyond the lumbar region of a backrest, and can also extend over the entire back.

[0097] The present disclosure also encompasses embodiments with any combination of features mentioned or shown above or below for various embodiments. It also encompasses individual features in the figures, even if they are shown there in connection with other features and / or are not mentioned above or below. Furthermore, the alternatives of embodiments described in the figures and the description and individual alternatives of their features may be excluded from the subject matter of the invention or from the disclosed subject matter. The disclosure encompasses embodiments that exclusively comprise the features described in the claims or in the exemplary embodiments, as well as those that comprise additional other features.Specific features or groups of features, as disclosed in the figures and the associated sections of the description, can also be combined in the more general embodiments of the invention, as disclosed in connection with the description of the invention. In particular, such specific features or groups of features can be provided in the more general embodiments of the invention independently of other specific features shown in the figures. For example, the shape of the slit from the drawings, i.e. the transverse horizontal cut which ends at its longitudinal ends upwards and downwards in a vertical direction, can be adopted in the embodiments of the description of the invention without further features of the embodiment of the drawings, such as the number of cuts or the like, being related to it.It is understood that those skilled in the art will be able to incorporate specific features from the description of the figures into the embodiments of the description of the invention.

[0098] Furthermore, the term "comprising" and derivatives thereof do not exclude other elements or steps. Likewise, the indefinite article "a" or "an" and derivatives thereof do not exclude a plurality. The functions of several features listed in the claims may be fulfilled by one unit or step. The terms "essentially," "about," "approximately," and the like in In particular, the term "approximately" in connection with a property or value also precisely defines the property or value. The terms "about" and "approximately" in connection with a given numerical value or range can refer to a value or range that lies within 20%, within 10%, within 5%, or within 2% of the given value or range. All reference signs in the claims are not to be understood as limiting the scope of the claims.

Claims

CLAIMS Claim 1: Back support module (1; 10) for a backrest (51) of a chair (5), comprising a slat device (2; 20) which has a plurality of slats (211; 2110), characterized by a main axis (4; 40) which is to be aligned quasi horizontally when the back support module (1; 10) is used, a main rocker (31; 310) which is tiltably fastened to a frame structure (512) of the backrest (51) via the main axis (4; 40), which has two end regions arranged on opposite sides of the main axis (4; 40), and a first secondary rocker (32; 320) which is tiltably fastened to a first of the two end regions of the main rocker (31; 310) via a first secondary axis (33; 330) running quasi parallel to the main axis (4; 40), which has two on opposite sides of the first secondary axis (33; 330) arranged end regions (34; 340), wherein in each case a slat (211; 2110) of the slat device (2; 20) is tiltably connected to the two end regions (34; 340) of the first secondary rocker (32;320) is mounted.; Claim 2: Back support module (1; 10) according to claim 1, which comprises a second secondary rocker (32; 320) which is tiltably fastened to a second of the two end regions of the main rocker (31; 310) via a second secondary axis (33; 330) running virtually parallel to the main axis (4; 40), said second secondary rocker having two end regions (34; 340) arranged on opposite sides of the second secondary axis (33; 330), wherein in each case a slat (211; 2110) of the slat device (2; 20) is tiltably mounted on the two end regions (34; 340) of the second secondary rocker (32; 320). Claim s: Back support module (1; 10) according to claim 1 or 2, wherein the main rocker (31; 310) and the first secondary rocker (32; 320) are integrally formed as a plastic component (3; 30). Claim 4: Back support module (1; 10) according to claim 3, wherein the Plastic component (3; 30) between the main rocker (31; 310) and the first secondary rocker (32; 320) has a material taper or a shape which forms the first secondary axis (33; 330). Claim s: Back support module (1; 10) according to claim 3 or 4, wherein the plastic component (3; 30) is plate-shaped and wherein the first secondary axis (33; 330) is formed by a film hinge provided in the plastic component (3; 30). Claims: Back support module (1; 10) according to one of the preceding claims, wherein the slat device (2; 20) is formed in one piece. Claim ?: Back support module (1; 10) according to claim 6, wherein the Slat device (2; 20) comprises a plate-like plastic body (21) which is provided with a plurality of slots (214; 2140), wherein the slats (211; 2110) are formed adjacent to or between the slots (214). Claim s: Back support module (1; 10) according to claim 7, wherein the slots (214; 2140) are substantially rectilinear. Claim 9: Back support module (1; 10) according to one of claims 6 to 8, wherein the slat device (2; 20) is made of an elastic plastic. Claim 10: Back support module (1; 10) according to one of claims 6 to 9, wherein the longitudinal ends of the slats (211; 2110) are connected to one another by a reinforcing region (213; 2130) of the slat device (2; 20). Claim 11: Back support module (1; 10) according to one of the preceding claims, wherein the main axis (4; 40) is designed as a rod (41; 410). Claim 12: Backrest (51) for a chair, comprising a frame structure (512) and a slat device (2; 20) having a plurality of slats (211; 2110), characterized by a main rocker (31; 310) tiltably attached to the frame structure (512) via a quasi-horizontal main axis (4; 40), which has two end regions arranged on opposite sides of the main axis (4; 40), and a first secondary rocker (32; 320) tiltably attached to a first of the two end regions of the main rocker (31; 310) via a quasi-horizontal first secondary axis (33; 330), which has two end regions (34; 340) arranged on opposite sides of the first secondary axis (33; 330), wherein in each case one slat (211; 2110) of the slat device (2; 20) is tiltably mounted on the two end regions (34; 340) of the first secondary rocker (32; 320). Claim 13: Backrest (51) according to claim 12, which comprises a second secondary rocker (32; 320) which is tiltably fastened to a second of the two end regions of the main rocker (31; 310) via a quasi-horizontal second secondary axis (33; 330), which second secondary rocker has two end regions (34; 340) arranged on opposite sides of the second secondary axis (33; 330), wherein in each case a slat (211; 2110) of the slat device (2; 20) is tiltably mounted on the two end regions (34; 340) of the second secondary rocker (32; 320). Claim 14: Backrest (51) according to claim 12 or 13, comprising an alignment element (7) which moves the main rocker (31; 310) into a basic position when the backrest (51) is not loaded. Claim 15: Backrest (51) according to claim 14, wherein the alignment element (7) is elastic and is arranged between the main rocker (31; 310) and the frame structure (512). Claim 16: Backrest (51) according to one of claims 12 to 15, which comprises a cover (511) pulled over the frame structure (512), wherein the slats (211; 2110) of the slat device (2; 20) are arranged in the cover (511). Claim 17: Backrest (51) according to one of claims 12 to 15, which comprises a cover (511) pulled over the frame structure (512), wherein the slats (211; 2110) of the slat device (2; 20) are designed as reinforced regions of the cover. Claim 18: Backrest (51) according to one of claims 12 to 17, wherein the main rocker (31; 310) and the first secondary rocker (32; 320) are integrally formed as a plastic component (3; 30). Claim 19: Backrest (51) according to claim 18, wherein the plastic component (3; 30) between the main rocker (31; 310) and the first secondary rocker (32; 320) has a material taper or a shape which forms the first secondary axis (33; 330). Claim 20: Backrest (51) according to claim 18 or 19, wherein the plastic component (3; 30) is plate-shaped and wherein the first secondary axis (33; 330) is formed by a film hinge provided in the plastic component (3; 30). Claim 21: Backrest (51) according to one of claims 12 to 20, wherein the slat device (2; 20) is formed in one piece. Claim 22: Backrest (51) according to claim 21, wherein the slat device (2; 20) comprises a plate-like plastic body (21; 210) which is provided with a plurality of slots (214; 2140), wherein the slats (211; 2110) are formed adjacent to or between the slots (214; 2140). Claim 23: Backrest (51) according to claim 22, wherein the slots (214; 2140) are substantially rectilinear. Claim 24: Backrest (51) according to claim 23, wherein the slots (214; 2140) run quasi horizontally. Claim 25: Backrest (51) according to one of claims 21 to 24, wherein the slat device (2; 20) is made of an elastic plastic. Claim 26: Backrest (51) according to one of claims 21 to 25, wherein the longitudinal ends of the slats (211; 2110) are connected to one another by a reinforcing region (213; 2130) of the slat device (2; 20). Claim 27: Backrest (51) according to one of claims 21 to 26, wherein the plate-like plastic body (21; 210) has an extension region (2150) which extends upwards from the slats (211; 2110). Claim 28: Backrest (51) according to claim 27, wherein the extension region (2150) of the plate-like plastic body (21; 210) has an upper end portion which is fixed to the frame structure (512). Claim 29: Backrest (51) according to claim 27 or 28, wherein the extension region (2150) of the plate-like plastic body (21; 210) has further slots (2160). Claim 30: Backrest (51) according to claim 29, wherein the further slots (2160) of the extension region (2150) of the plate-like plastic body (21; 210) run from bottom to top. Claim 31: Backrest (51) according to claim 29 or 30, wherein the further slots (2160) of the extension region (2150) of the plate-like Plastic body (21; 210) are essentially straight. Claim 32: Backrest (51) according to one of claims 21 to 31, wherein the plate-like plastic body (21; 210) is fastened to the frame structure (512) below the slats (211; 2110). Claim 33: Backrest (51) according to one of claims 12 to 32, wherein the frame structure (512) comprises a shell. Claim 34: Backrest (51) according to one of claims 12 to 33, wherein the main axis (4; 40) is designed as a rod (41; 410). Claim 35: Backrest (51) according to one of claims 12 to 34, comprising a cover covering the slat device (2; 20), the main axis (4; 40), the main rocker (31; 310), the first secondary axis (33; 330) and the secondary rocker (32; 320). Claim 36: Backrest (51) according to one of claims 12 to 35, which comprises a back support module (1; 10) according to one of claims 1 to 11. Claim 37: Chair (5) with a seat and a backrest (51) according to one of claims 12 to 36.

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