Seat mechanism for a seat and reclined furniture

Abstract

A seating mechanism for an item of furniture for sitting and reclining according to the invention has a seat and a backrest, where the backrest has a lower backrest frame and an upper backrest frame, and the lower backrest frame is coupled to the seat so as to be pivotable about a first pivot axis, and the lower backrest frame is coupled to the upper backrest frame so as to be pivotable about a second pivot axis. A first pivot axis is provided so as to be pivotable about a second pivot axis, and wherein a first actuator is provided for adjusting the angle between the seat and the lower backrest frame, and a second actuator is provided for adjusting the angle between the lower backrest frame and the upper backrest frame. Further, a lumbar support is provided that is attached to or adjustably mounted with respect to the upper or lower backrest frame.

Description

Technical Field

[0001] The invention relates to a seating mechanism for an item of furniture for sitting and reclining having a seat and a backrest, and an actuator for adjusting the angle between the seat and the backrest. Background Art

[0002] In particular, these seats can be reclining chairs or lounge chairs, which can usually be changed from an upright basic position to at least one reclining position. Retractable and extendable footrests are also usually provided, which increase the comfort of the reclining position. Such chairs are very comfortable and promote relaxation.

[0003] Almost everyone has to deal with back pain in the course of their life, which is caused especially by lack of exercise, overwork and incorrect nutrition, but especially by incorrect sitting posture for long periods of time. Therefore, a lounge chair or recliner is considered to be very comfortable and relaxing.

[0004] A leisure chair with an aid for standing up is known from DE 20 2019 100 213 U1, which comprises a footrest, a seat and a backrest, which can be brought from a basic position into a raised position to facilitate standing up or at least can be converted into a relaxed position with the footrest in an extended state.

[0005] Furthermore, EP 3 143 902 B1 discloses a recliner comprising a seat, a backrest and a footrest, the recliner having a footrest adjustment mechanism having a first actuator for extending and retracting the footrest and a seat and backrest adjustment mechanism having a second actuator for adjusting the seat and the backrest.

[0006] Although the relaxed reclining position is felt very comfortable by the user, passive reclining does not replace the movements of the body, such as occur when walking or playing sports. However, in some cases, due to the most different reasons (lack of time, physical illness), the natural movement of the body is not always possible to a sufficient extent. Therefore, so-called massage chairs have been developed, which are equipped with massage elements, such as massage rollers in the backrest. The activation of the massage function has a relaxing effect on the back muscles and can relieve spasms and tension. Such a massage chair is known, for example, from EP1738736B1. However, such a massage chair is relatively complex and expensive due to the technology built into the backrest.

[0007] Furthermore, DE 10 2020 107 243 A1 discloses a furniture item for sitting and reclining, which has a seat, a backrest and an adjustment mechanism for changing the position of the seat and / or the backrest between at least a first reclining position and a second reclining position, the adjustment mechanism having at least one actuator and a controller, and the controller providing at least one positioning mode for positioning the seat and / or the backrest in the first reclining position or the second reclining position. Furthermore, the controller has a relaxation mode for repeatedly and continuously moving the seat and / or the backrest back and forth between the first reclining position and the second reclining position.

[0008] Chairs and reclining chairs known, for example, from DE 20 2019 100 213 U1 and EP 3 143 902 B1 usually have only one positioning mode for adjusting an item of furniture for sitting and reclining, for example from an upright basic position into a first reclined position or a second reclined position. DE 10 2020 107 243 A1 exploits this prior art by adding an actuable relaxation mode, which enables the seat and / or backrest to be moved back and forth between a first reclined position and a second reclined position. In this way, the user experiences a continuous movement, which has a very beneficial, in particular relaxing, effect on the user. Existing actuators can be used for implementation, so that only the controller needs to be changed. Summary of the invention

[0009] The object of the invention is to specify a chair mechanism which allows further possibilities for activating the user's body.

[0010] According to the invention, this object is achieved by the features of claim 1 .

[0011] The seat mechanism of the furniture article for sitting and reclining according to the invention comprises a seat and a backrest, wherein the backrest has a lower backrest frame and an upper backrest frame, and the lower backrest frame is coupled to the seat so as to be pivotable about a first pivot axis, and the lower backrest frame is coupled to the upper backrest frame so as to be pivotable about a second pivot axis, and wherein a first actuator is provided for adjusting the angle between the seat and the lower backrest frame, and a second actuator is provided for adjusting the angle between the lower backrest frame and the upper backrest frame. In addition, a lumbar support is provided, which is attached to the upper backrest frame or the lower backrest frame and is adjustably mounted relative to the lower backrest frame and / or the upper backrest frame.

[0012] The two-part backrest offers the possibility to move and activate the user's back area to a certain extent.

[0013] Further embodiments of the invention are subject matter of the dependent claims.

[0014] In order to be able to realize different program sequences, the first actuator is expediently designed for a pivoting range of 25°+ / -5° about the first pivot axis. For this purpose, the first actuator for adjusting the angle between the seat and the lower backrest frame (measured at the front side of the seat mechanism) can preferably be designed between a minimum angle of 100° and a maximum angle of 125°, in each case + / - 10°.

[0015] For the second actuator, a pivoting range of 35°+ / -5° about the second pivot axis has proven to be particularly advantageous, wherein the second actuator is designed to adjust the angle between the lower backrest frame and the upper backrest frame, which angle is measured at the front side of the seat mechanism, preferably between a minimum angle of 155° and a maximum angle of 200°, in each case + / -10°.

[0016] In order to increase comfort, it has proven useful to provide a footrest mounted on the seat so as to be able to extend and retract. A first actuator can be used to extend and retract the footrest using a suitable seat and footrest mechanism. However, within the scope of the invention, it is also conceivable to use its own actuator to extend and retract the footrest.

[0017] According to one embodiment, the lumbar support may be connected to the upper backrest frame and pivot together with the upper backrest frame about the second pivot axis. In another variant, however, a relative adjustment of the lumbar support may be provided with respect to the upper backrest frame and / or the lower backrest frame.

[0018] Preferably, the lumbar support has a lumbar support plate which extends in the region of the lower backrest frame transversely to the longitudinal center axis of the seat mechanism. Here, the lumbar support can be arranged such that the distance between the lumbar support plate and the lower backrest frame changes when the second actuator is actuated. Furthermore, the lumbar support can be arranged such that an adjustment of the angle between the upper backrest frame and the lower backrest frame causes a change in the distance of the lumbar support transversely to the plane spanned by the first and second pivot axes.

[0019] The lumbar support allows additional movement in the lower back area and in this way counteracts the negative consequences of lack of movement.In addition, the lumbar support can be combined with targeted control of the second actuator to adjust the angle between the two backrest frames to improve the breathing quality.

[0020] In one embodiment of the lumbar support, the lumbar support has a lumbar support plate and at least one support element holding the lumbar support plate, wherein the support element is fastened to the upper backrest frame in such a way that a portion of the support element passes through a plane spanned by the first and second pivot axes in the region between the first and second pivot axes. It is also conceivable that the lumbar support has a lumbar support plate and that the lumbar support can be fastened to the upper backrest frame in at least two positions in which the lumbar support plate has different distances from the second pivot axis. Furthermore, the lumbar support can be fastened to the upper backrest frame in at least two positions in which the lumbar support plate has different distances from the plane spanned by the first and second pivot axes. In another embodiment of the invention, the lumbar support can be fastened to the upper backrest frame so as to be adjustable in two directions, wherein the two directions enclose an angle of 90°+ / -20°. The positioning adjustment of the lumbar support provides the possibility of adapting the lumbar support to different geometries of the seat mechanism or different upholstery of furniture items for sitting and reclining.

[0021] In order to further increase the comfort of the user, it is advantageous if the user's head can lie flat. This can be achieved on the one hand by making the backrest correspondingly long, in particular by a correspondingly extended upper backrest frame, or on the other hand by providing a headrest. The headrest can be connected to the upper backrest frame so that it can pivot around a third pivot axis. In addition, a third actuator can be provided to adjust the angle between the headrest and the upper backrest frame. For the second actuator, a pivot range of 50°+ / -5° around the second pivot axis has proven to be particularly advantageous, wherein the second actuator is designed to adjust the angle between the lower backrest frame and the upper backrest frame, which angle is measured at the front side of the seat mechanism, which angle is preferably between a minimum angle of 150° and a maximum angle of 200°, in each case + / -10°.

[0022] According to a specific embodiment of the present invention, a control unit for controlling a first actuator and / or a second actuator and / or a third actuator (if present) is provided, wherein the control unit has at least two different program sequences, in which one or more of these actuators operate at an adjustable speed, so that the angle adjustable by the corresponding actuator changes continuously and repeatedly between a specific minimum angle and a specific maximum angle.

[0023] Furthermore, a control unit for controlling the second actuator may be provided which is designed such that the angle between the lower backrest frame and the upper backrest frame can be varied continuously in several cycles between a minimum angle and a maximum angle at a specific speed about the second pivot axis.

[0024] Preferably, the actuator is designed as a linear motor with an electric motor, a threaded spindle and a spindle nut, which actuator can be adjusted by rotating the threaded spindle and the actuator can be adjusted at a speed suitable for the respective program sequence. Speeds in the range of 0.3 to 50 mm / s are conceivable. For micromotion programs, speeds in the range of 0.3 to 2 mm / s, for normal activity programs, speeds in the range of 4 to 8 mm / s, and for breathing programs, speeds in the range of 30 to 50 mm / s have proven to be particularly advantageous. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Further embodiments of the present invention are explained in more detail with reference to the following description and the accompanying drawings.

[0026] In the attached picture: Figure 1 shows a three-dimensional illustration of a seat mechanism according to a first exemplary embodiment, Figure 2 Shown according to Figure 1 side view of the seat mechanism of the vehicle in the upright basic position with the footrest folded, Figure 3 Shown according to Figure 1 a side view of a seat mechanism of the invention, the seat mechanism being in a first reclined position with the footrest extended, Figure 4 Shown according to Figure 1 a side view of a seat mechanism of the invention, the seat mechanism being in a second reclined position with the footrest extended, Figure 5 Shown according to Figure 1 a side view of a seat mechanism of the invention, the seat mechanism being in a first position of a breathing program sequence, Figure 6 Shown according to Figure 1 a side view of a seat mechanism of the invention, the seat mechanism being in a second position of a breathing program sequence, Figures 7a to 7c Three schematic illustrations of the chair mechanism during a breathing program sequence are shown, Figures 8a to 8c Three schematic illustrations of the seat mechanism during a micro-motion program sequence are shown, Figures 9a to 9c Three schematic illustrations of the seat mechanism during an active program sequence are shown, Fig.10 shows a three-dimensional illustration of a seat mechanism according to a second exemplary embodiment, Fig.11 Shown according to Fig.10 A side view of the seat mechanism in a first position of a breathing program sequence, Fig.12Shown according to Fig.10 Side view of the chair mechanism in the second position of the breathing program sequence. DETAILED DESCRIPTION

[0027] exist Figures 1 to 6 , a first embodiment of a seat mechanism for a furniture item for sitting and reclining according to the invention is shown in different views and positions. It essentially comprises a seat 1, a backrest 2, a headrest 3 and a footrest 4, wherein the backrest 2 provides a lower backrest frame 2a and an upper backrest frame 2b. Here, the seat is coupled to the lower backrest frame 2a so as to be pivotable about a first pivot axis 5, and the lower backrest frame 2a is coupled to the upper backrest frame 2b so as to be pivotable about a second pivot axis 6, wherein a first actuator 7 is provided for adjusting an angle α between the seat 1 and the lower backrest frame 2a, and a second actuator 8 is provided for adjusting an angle β between the lower backrest frame 2a and the upper backrest frame 2b.

[0028] The footrest adjustment mechanism 9 is provided for Figure 2 and 3 The footrest 4 is extended and retracted between the positions shown. In addition, a seat and backrest adjustment mechanism 10 is provided for changing the position of the seat 1 and / or the backrest 2. The footrest adjustment mechanism 9 and the seat and backrest adjustment mechanism 10 interact with the first actuator 7 in such a way that the first actuator 7 is moved from the Figure 2 Starting from the upright basic position shown, a first actuation of the first actuator 7 causes the footrest 4 to extend to Figure 3 Then, further actuation of the first actuator 7 causes the angle α between the seat 1 and the lower backrest frame 2a to increase, thereby reaching the first reclined position according to Figure 4 For further details on the footrest adjustment mechanism 9 and the seat and backrest adjustment mechanism 10, reference is made to DE 20 2019 100 213 U1.

[0029] The headrest 3 is coupled to the upper backrest frame 2 b so as to be pivotable about a third pivot axis 11 , wherein a third actuator 12 is provided for adjusting an angle γ between the headrest 3 and the upper backrest frame 2 b .

[0030] The seat 1 has a seat frame 1a to which one end of a first actuator 7 is attached. The other end of the first actuator 7 is coupled to a seat and backrest adjustment mechanism 10. The lower backrest frame 2a has a lower cross member 13, while the upper backrest frame 2b provides an upper cross member 14, wherein a second actuator is coupled to the lower cross member 13 at one end and to the upper cross member at the other end. A third actuator 12 is arranged between the upper cross member 14 and a headrest cross member 15.

[0031] The three actuators 7, 8, 12 are arranged relative to their associated pivot axes 5, 6, 11 in such a way that they can achieve the desired pivot range in each case. Thus, the first actuator 7 is conveniently designed for a pivot range of 25°+ / -5° about the first pivot axis 5, wherein the first actuator 7 can adjust the angle α between the seat 1 and the lower backrest frame 2a, which angle α is measured on the front side of the seat mechanism, preferably between a minimum angle of 100° and a maximum angle of 125°, in each case + / -10°. The second actuator 8 is conveniently designed for a pivot range of 35°+ / -5° about the second pivot axis 6, wherein the second actuator 8 can adjust the angle β between the lower backrest frame 2a and the upper backrest frame 2b, which angle β is measured on the front side of the seat mechanism, preferably between a minimum angle of 165° and a maximum angle of 200°, in each case + / -10°. The third actuator 12 is conveniently designed for a pivoting range of 50°+ / -5° about the third pivot axis 11, wherein the second actuator 8 can adjust the angle γ between the lower backrest frame 2a and the upper backrest frame 2b, which angle γ is measured on the front side of the seat mechanism, preferably between a minimum angle of 150° and a maximum angle of 200°, in each case + / - 10°.

[0032] According to an exemplary embodiment of the invention, a lumbar support 16 is further provided, wherein the lumbar support is fastened to the upper backrest frame 2b and can be pivoted together with the upper backrest frame 2b about the second pivot axis 6. The lumbar support 16 has a lumbar support plate 16a, which extends transversely to the longitudinal center axis of the seat mechanism in the region of the lower backrest frame 2a, and at least one support element 16b is provided for holding the lumbar support plate 16a, wherein the support element 16b is fastened to the upper backrest frame 2b such that a portion of the support element 16b is in the region between the first and second pivot axes 5, 6 (see Figure 5 and 6 ) passes through a plane spanned by the first and second pivot axes 5, 6.

[0033] In this way, the lumbar support plate protrudes at the front side of the seat mechanism and can perform the conventional function of a lumbar support, wherein when the second actuator 8 is actuated, the distance of the lumbar support plate 16a from the lower backrest frame 2a changes, e.g. from Figure 5 and 6 This is particularly clear in the comparison of the two positions shown. Figure 5 In the embodiment, an angle β1 of 165° is set between the lower back frame 2a and the upper back frame 2b, which is measured at the front side of the seat mechanism, and according to Figure 6In the position of , an angle β2 of 200° is set between the lower backrest frame 2a and the upper backrest frame 2b, which is measured on the front side of the seat mechanism. When the lumbar support 16 rotates together with the upper backrest frame 2b about the second pivot axis 6, the distance of the lumbar support 16 from the lower backrest frame 2a also changes. For example, in accordance with Figure 5 In the position, the distance a1 is about 20 mm, and Figure 6 This distance is measured to be approximately 70 mm.

[0034] In addition to adjusting the lumbar support 16 relative to the lower backrest frame 2a by actuating the second actuator 8, it can also be provided that the lumbar support 16 can be fastened to the upper backrest frame 2b so as to be adjustable in two directions, wherein the two adjustment directions preferably enclose an angle of 90°+ / -20°. In the embodiment shown, the support element 16b is formed by two arms of L-shaped configuration, each of which is telescopically adjustable, so that the distance of the lumbar support plate can be adjusted in two directions.

[0035] The three actuators 7, 8 and 12 can be controlled in a targeted manner via a control unit (not shown in detail) in order to individually set a desired position or to move to a preprogrammed position, for example according to Figure 2 , 3 and 4 positions.

[0036] In addition to moving to separate or preprogrammed positions, the control unit can be designed to control the first actuator and / or the second actuator and / or the third actuator, and can execute different program sequences in which one or more of the actuators 7, 8, 12 are operated at an adjustable speed so that the angle adjustable by the corresponding actuator varies continuously and repeatedly between a specific minimum angle and a specific maximum angle, each program sequence being repeated in a plurality of cycles.

[0037] according to Figures 7a to 7c , 8a to 8c and 9a to 9c, three different program sequences are given below. However, within the scope of the present invention, these program sequences can also be modified or constructed completely differently.

[0038] Figures 7a to 7c A breathing program sequence is shown that is particularly suitable for regulating the heart rate of a user sitting on an item of furniture for sitting and reclining, increasing heart rate variability and synchronizing the activity of the sympathetic and parasympathetic programs. It can also be used to reduce pressure on the intervertebral discs and make the spine more flexible.

[0039] The footrest 4 is here in the extended position and a maximum angle of, for example, 125° is set between the seat 1 and the lower backrest frame 2a. The headrest 3 is in the folded-back position. In the breathing program sequence, then, only the second actuator 8 is actuated in such a way that the angle between the lower backrest frame 2a and the upper backrest frame 2b, which is measured at the front side of the seat mechanism, is continuously moved between a minimum angle of 165° and a maximum angle of 200°, in each case + / - 10°. Figure 7a shows the position with the smallest angle, while Figure 7c The maximum angle is shown. The intermediate position is as Figure 7b As shown. The cycle starts from Figure 7a Starting from the position shown, Figure 7b Arrive at the location shown Figure 7c The position shown, and then moves in the reverse direction, passing Figure 7b The position shown returns to Figure 7a The breathing program sequence is designed for a large number of such cycles and can be terminated manually or after a specific number of cycles. The second actuator 8 operates at a speed of about 40 mm / s + / - 10 mm / s during the breathing program sequence. One cycle then lasts about 10 seconds.

[0040] Figures 8a to 8c A micro-movement program sequence is shown which performs smooth, barely perceptible movements which are able to stimulate the muscles and relax them. The footrest 4 is again in the extended position and an angle of less than 180°, preferably about 175°, is set between the lower backrest frame 2a and the upper backrest frame 2b, which is measured on the front side of the seat mechanism. The headrest 3 is in a position which is slightly tilted forward. In the micro-movement program sequence, only the first actuator 7 is then actuated in such a way that the angle between the seat 1 and the lower backrest frame 2a, measured on the front side of the seat mechanism, is continuously moved between a minimum angle of 100° and a maximum angle of 125°, in each case by + / -10°. Figure 8a shows the position with the smallest angle, while Figure 8c The position of the maximum angle is shown. Figure 8b The intermediate position is shown again in FIG. The micro-motion program sequence is also designed for a large number of such cycles ( Figure 8a , Figure 8b , Figure 8c , Figure 8b , Figure 8a ), and can be terminated manually, or after a predetermined number of cycles, or after a certain time, for example 1 to 2 hours. The first actuator 7 operates at a relatively very slow speed of about 0.9 mm + / - 0.6 mm / s in the micro-motion program sequence. Then one cycle lasts about 10 minutes.

[0041] Figures 9a to 9c An activity program sequence is shown which moves the entire body of a person reclining on an item of furniture in order to sit and recline. Figure 9a In the initial position of the footrest 4, the footrest 4 is in a semi-extended position. A minimum angle of approximately 100° is provided between the seat and the lower backrest frame 2a. The upper backrest frame 2b is positioned slightly forward compared to the lower backrest frame 2a. The headrest 4 is also in a slightly forwardly inclined position. In order to reach the position according to Figure 9b The first actuator 7 is actuated until a maximum angle of about 125° is reached between the seat and the lower backrest frame. The second actuator 8 is also actuated to set an angle between the lower backrest frame 2a and the upper backrest frame 2b (measured at the front side of the seat mechanism) that is greater than 180°, preferably about 190°. The headrest 3 initially remains in its slightly forwardly tilted position. In order to reach Fig.9c , on the one hand, the second actuator 8 is driven in order to increase the angle between the lower backrest frame 2a and the upper backrest frame 2b, thereby establishing an angle of, for example, 200°. In addition, the headrest is brought into the folded-back position. The movement program sequence is also designed for a large number of such cycles ( Figure 9a , Figure 9b , Fig.9c , Figure 9b , Figure 9a ), and can be terminated manually or after a predetermined number of cycles or after a certain time (e.g. 15 minutes). The three actuators 7, 8, 12 are operated at a speed of about 6 mm / s + / - 2 mm / s in the motion program sequence. This results in a cycle duration of about 1 to 2 minutes.

[0042] exist Figures 10 to 12 , a seat mechanism according to a second embodiment is shown, which differs from the first embodiment described previously mainly in that no headrest is provided and that the upper backrest frame 2b' is accordingly made longer. In addition, the seat mechanism also includes a seat 1', a lower backrest frame 2a' and a footrest 4', as well as a first actuator 7' and a second actuator 8', which interact in the same way as in the first embodiment. Therefore, actuation of the first actuator 7' results in adjustment of the angle between the seat 1' and the lower backrest frame 2a', while the second actuator 8' adjusts the angle between the lower backrest frame 2a' and the upper backrest frame 2b'.

[0043] Unlike the first embodiment, the lumbar support 16 ′ is attached to the lower back frame 2 a ′ and is adjusted with respect to its distance from the lower back frame 2 a ′ by means of a fourth actuator 17 ′.

[0044] Fig.11 and Fig.12Two extreme positions of the breathing program sequence of this second embodiment are shown. Fig.11 In the position of , the second actuator 8' sets the angle between the lower backrest frame 2a' and the upper backrest frame 2b' (measured on the front side of the seat mechanism) to, for example, 155°. The lumbar support 16' is adjusted by the fourth actuator 17' to a distance a1' of, for example, 20 mm from the lower backrest frame 2a'. In order to reach the angle according to Fig.12 The second actuator 8' is operated in such a way that an angle of, for example, 200° is set between the lower backrest frame 2a' and the upper backrest frame 2b', which is measured on the front side of the seat mechanism. At the same time, the distance a2' of the lumbar support 16' is changed to, for example, 70 mm by means of the fourth actuator 17'. The two actuators operate continuously and throughout a plurality of cycles.

[0045] The second embodiment can also be used for other program sequences.

Claims

1. A seating mechanism for a furniture item for sitting and reclining, comprising a seat (1) and a backrest (2), wherein the backrest (2) comprises a lower backrest frame (2a) and an upper backrest frame (2b), and the lower backrest frame (2a) is coupled to the seat (1) so as to be pivotable about a first pivot axis (5), and the lower backrest frame (2a) is coupled to the upper backrest frame (2b) so as to be pivotable about a second pivot axis (6), and wherein a A first actuator (7) is provided for adjusting the angle between the seat (1) and the lower backrest frame (2a), and a second actuator (8) is provided for adjusting the angle between the lower backrest frame (2a) and the upper backrest frame (2b), and a lumbar support (16) is provided, which is attached to the upper or lower backrest frame (2b, 2a) and is adjustably mounted relative to the lower and / or upper backrest frame (2a, 2b).

2. The seat mechanism according to claim 1, characterized in that: The first actuator (7) is designed for a pivoting range of 25° + / - 5° about the first pivot axis.

3. The seat mechanism according to claim 1, characterized in that: The second actuator (8) is designed for a pivoting range of 35° + / - 5° about the second pivot axis.

4. The seat mechanism according to claim 1, characterized in that: The first actuator (7) is designed to adjust the angle between the seat (1) and the lower backrest frame (2a) measured on the front side of the seating mechanism between a minimum angle of 100° and a maximum angle of 125°, in each case + / - 10°.

5. The seat mechanism according to claim 1, characterized in that: The second actuator (8) is designed to adjust the angle between the lower backrest frame (2a) and the upper backrest frame (2b) measured on the front side of the seat mechanism between a minimum angle of 155° and a maximum angle of 200°, in each case + / - 10°.

6. The seat mechanism according to claim 1, characterized in that: A footrest (4) is also provided, and the footrest (4) is mounted on the seat (1) so as to be retractable and extendable.

7. The seat mechanism according to claim 1, characterized in that: The lumbar support (16) is attached to the upper backrest frame (2b) and is pivotable together with the upper backrest frame (2b) about the second pivot axis (6).

8. The seat mechanism according to claim 1, characterized in that: Another actuator is provided for adjusting the lumbar support (16) relative to the upper backrest frame and / or the lower backrest frame (2b, 2a).

9. The seat mechanism according to claim 1, characterized in that: The lumbar support (16) has a lumbar support plate (16a) which extends in the region of the lower backrest frame (2a) transversely to the longitudinal center axis of the seat mechanism.

10. The seat mechanism according to claim 9, characterized in that: The lumbar support portion (16) is arranged such that the distance of the lumbar support plate (16a) relative to the lower backrest frame (2a) changes when the second actuator (8) is actuated.

11. The seat mechanism according to claim 1, characterized in that: The lumbar support (16) is arranged so that adjustment of the angle between the upper back frame (2b) and the lower back frame (82a) causes a change in the distance of the lumbar support (16) transverse to a plane spanned by the first and second pivot axes (5, 6).

12. The seat mechanism according to claim 1, characterized in that: The lumbar support portion (16) has a lumbar support plate (16a) and at least one support element (16b) holding the lumbar support plate (16a), wherein the support element (16b) is fastened to the upper backrest frame (2b) in such a way that a part of the support element (16b) passes through a plane spanned by the first and second pivot axes (5, 6) in the area between the first and second pivot axes (5, 6).

13. The seat mechanism according to claim 1, characterized in that: The lumbar support (16) has a lumbar support plate (16a) and can be fastened to the upper backrest frame (2b) in at least two positions in which the lumbar support (16a) has different distances from the second pivot axis (6).

14. The seat mechanism according to claim 1, characterized in that: The lumbar support (16) has a lumbar support plate (16a) and can be fastened to the upper backrest frame (2b) in at least two positions in which the lumbar support plate (16a) has different distances from a plane spanned by the first and second pivot axes (5, 6).

15. The seat mechanism according to claim 1, characterized in that: The lumbar support (16) can be fastened to the upper backrest frame (2b) so as to be adjustable in two directions, wherein the two directions enclose an angle of 90°+ / -20°.

16. The seat mechanism according to claim 1, characterized in that: A headrest (3) is also provided, the headrest (3) being connected to the upper backrest frame (2b) so as to be pivotable about a third pivot axis (11), and a third actuator (12) is provided for adjusting the angle between the headrest (3) and the upper backrest frame (2b).

17. The seat mechanism according to claim 16, characterized in that: The third actuator (12) is designed for a pivoting range of 50°+ / -5° about the third pivot axis (11).

18. The seat mechanism according to claim 16, characterized in that: The third actuator (12) is designed to adjust the angle between the headrest (3) and the upper backrest frame (2b) between a minimum angle of 150° and a maximum angle of 200°, measured on the front side of the seat mechanism, in each case + / - 10°.

19. The seat mechanism according to claim 1, characterized in that: A control unit is provided for controlling the first and / or second and / or third actuator (7, 8, 12), wherein the control unit has at least two different program sequences, in which one or more of the three actuators (7, 8, 12) are operated at an adjustable speed so that the angle adjustable by the corresponding actuator changes continuously and repeatedly between a specific minimum angle and a specific maximum angle.

20. The seat mechanism according to claim 1, characterized in that A control unit is provided for controlling the second actuator (8), the second actuator (8) being designed so that the angle between the lower backrest frame (2a) and the upper backrest frame (2b) around the second pivot axis (6) can be continuously changed between a minimum angle and a maximum angle in a plurality of cycles at a specific speed.

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