WO2005051133A1

WO2005051133A1 - Lumbar support

Info

Publication number: WO2005051133A1
Application number: PCT/EP2004/013396
Authority: WO
Inventors: Veit STÖSSEL; Andreas Mahler
Original assignee: Schukra Gerätebau AG
Priority date: 2003-11-28
Filing date: 2004-11-25
Publication date: 2005-06-09
Also published as: CN1878488A; EP1694167A1; JP2007533367A; DE10355659A1; KR100811412B1; US20070216207A1; KR20060090720A

Abstract

A lumbar support with an arching support element (1-3) is disclosed, with an adjuster mechanism (8-17), for individual matching of the arching of the arching support element (1-3) to the needs of each user, embodied such as to be able to generate an arching of the arching support element (1-3) in a first arching direction, in which the arching support element (1-3) forms a convex support surface and also an arching of the arching support element (1-3) in a second arching direction, in which the arching support element (1-3) forms a concave support element.

Description

LUMBAR SUPPORT

The present invention relates to a lumbar support as it can be used to support the lumbar and spinal area in backrests in all types of seats, for example motor vehicle seats.

Known lumbar supports of the type described above comprise at least one archable support element, which is also referred to as a lordosis basket or lordosis shield and can for example consist of a wire mesh or a one-piece plastic injection molded part. In addition, known lumbar supports include an adjustment mechanism by means of which the curvature of the at least one archable support element of the lumbar support can be adjusted. An adjustment mechanism known from the prior art comprises a Bowden cable arrangement, the casing of the Bowden cable arrangement being supported on one end section of the archable support element, while the wire of the Bowden cable arrangement which is displaceably mounted in the casing is attached to another end section of the archable support element, so that it is moved of the wire in the sheath of the Bowden cable arrangement, the two end sections are moved towards one another to a greater or lesser extent, in order thus to adjust the curvature of the support element. The adjustment of the wire in the sheath of the Bowden cable arrangement can be done either manually, for example using a handwheel, or automatically with the aid of a corresponding motor drive.

Lumbar supports of the type described above are used, for example, in the backrests of motor vehicle seats. The lumbar supports have a multiple support function, since both the lower spine area, i.e. the lumbar or lumbar area, as well as the central spine area and the upper spine area must be adequately supported in order to reliably relieve symptoms of fatigue when sitting for long periods and possibly even damage to health avoid. For this reason, the use of lumbar supports, their curvature or Curvature can be adjusted, of the utmost importance, in order to be able to adapt the crown to the individual needs of each person. This applies not only to lumbar supports in motor vehicle seats, but also applies to applications in the backrests of seats of any kind, for example office chairs, etc.

With the help of the conventional adjustable lumbar support, sufficient support functionality can be ensured in most cases by a user adjusting the curvature of the archable support element of the lumbar support towards its spine in accordance with its spinal shape.

However, the human spine is shaped extremely individually. As a result, the case may arise that a convex curvature of the support surface, that is to say the archable support element, the lumbar support is helpful and pleasant for one user, while the same curvature is unpleasant for the other user and possibly even harmful. In particular, spinal forms are also conceivable in which a convex curvature of the lumbar support can lead to considerable health damage in the long term. In addition, it should be noted that the human spine deforms with increasing sitting time, whereby more support is required in the lordosis area of the respective user with increasing sitting time.

Accordingly, there is basically a need for a lumbar support that takes into account the problems described above and allows greater flexibility and adaptability to the individual shape of the spine or the individual course of the spine of different users.

This object is achieved by a lumbar support with the features of claim 1. The subclaims each define preferred and advantageous embodiments of the present invention. The lumbar support according to the invention comprises at least one archable support element and an adjustment mechanism for adjusting the curvature of the archable support element, the adjustment mechanism being designed such that, in contrast to lumbar support, it does not only have a curvature of the archable support element in a first direction of curvature, in which the archable support element is one forms convex support surface, but also enables a curvature in a second curvature direction, in which the archable support element forms a concave support surface. The lumbar support according to the invention thus enables both a “positive” curvature and a “negative” curvature, so that the lumbar support can be adapted much better to the specific requirements of a user compared to conventional lumbar support.

The adjustment mechanism is also advantageously designed such that the second direction of curvature is essentially opposite to the first

Direction of curvature is directed out of the plane of the flat support element.

By using a circumferential Bowden cable system it can be achieved that the curvature of the archable support element can be adjusted and adapted in both curvature directions with the aid of this circumferential Bowden cable system. Likewise, a mechanical adjustment mechanism is also conceivable, which acts on the crown or bulge point of the archable support element and accomplishes the curvature of the archable support element in both curvature directions, such a mechanical adjustment mechanism being able to be implemented, for example, with the aid of a spindle drive.

The adjustment mechanism according to the invention is composed in principle of two adjustment means, the first adjustment means causing the curvature of the archable support element in the first curvature direction, while the second adjustment means bring about the curvature of the archable support element in the second curvature direction. The two adjustment means can be coupled to one another via a common actuating device. Beyond that however, it is also conceivable to design the two adjusting means separately and separately from one another.

The adjustment means can, for example, each be formed by Bowden cable arrangements, the sheath of the first Bowden cable arrangement being supported on a first end section of the archable support element and the wire of the first Bowden cable arrangement acting as a tension element acting on a second end section of the archable support element, in order to adjust the wire within the Cover of the first Bowden cable arrangement to move the two end sections more or less strongly towards one another, in particular to pull them. Advantageously, the wire can be guided from the first end section via deflecting means, in particular in the form of a deflecting roller, to the second end section from time to time back to the first end section and can be attached there to the archable support element in order thus to curl the archable support element in the first direction of curvature to be able to adjust more effectively and with less effort. The wire of the first Bowden cable arrangement is preferably guided along the back of the archable support element. The sheath of the second Bowden cable arrangement can also be supported on the first end section of the archable support element, starting from this first end section the wire of the second Bowden cable arrangement leading to the second end section and from there in turn via suitable deflection means back to the first end section and fastened here. The course of the wire of the second Bowden cable arrangement preferably takes place initially along the back of the archable support element, the wire of the second Bowden cable arrangement then being guided through an opening in the archable support element to the front thereof and being deflected there. The wire then returns to the back of the same through a further opening in the archable support element and is guided from there along the back to its fastening point on the first end section of the archable support element. This type of guidance also enables a particularly effective curvature of the archable support element in the second curvature direction with little effort. The previously mentioned deflection roller can be pivotably attached to the second end section of the archable support element, wherein the deflection roller can be pivoted out of the plane of the archable support element, in order to enable the wire of the first Bowden cable arrangement to run as smoothly as possible and to be adjusted with little effort.

The archable support element can comprise a first flat support section and a second flat support section, which over at least one in

Longitudinal direction of the support element extending flexible longitudinal web are connected. The flexible longitudinal web is designed such that it has flexibility in the longitudinal direction of the support element, so that even if the lumbar support is misused, i.e. if the lumbar support is loaded with an impermissibly high load, the lumbar support will break or be damaged due to the longitudinal flexibility this longitudinal web is prevented. For this purpose, the longitudinal web and elevations alternately arranged in the longitudinal direction

Have depressions in the form of an accordion, each in

Transverse direction of the longitudinal web. Two such longitudinal webs are preferably provided spaced apart from one another in the width direction of the archable support element.

The adjustment mechanism of the lumbar support according to the invention can be operated both manually and motor-operated. It is possible that common actuating means for adjusting the curvature of the archable support element are provided both in the first curvature direction and in the second curvature direction in such a way that an adjustment of the curvature in the first curvature direction is active at the same time to reduce the curvature in the second curvature direction contributes and vice versa, so that an effective adjustment of the curvature of the lumbar support according to the invention in both curvature directions is possible with little effort. The lumbar support can be assigned a further adjustment mechanism for adjusting the archable support element along guide means, for example guide rods, with the aid of this further adjustment mechanism, which can also be designed in the form of a Bowden cable arrangement, in particular in the form of a circumferential Bowden cable system, a height adjustment of the lordosis support is possible in a backrest of a seat. For this purpose, the sheath of the Bowden cable arrangement can be supported on a holder coupled to the guide means, while the wire of the Bowden cable arrangement is coupled to the archable support element, preferably via a spring element. Also with regard to the height adjustment of the lumbar support, two separate Bowden cable arrangements can be provided for adjusting the archable support element in a first longitudinal direction along the guide means or for adjusting the archable support element in an opposite second longitudinal direction along the guide means, the two Bowden cable arrangements being used when using a circumferential Bowden cable system can be coupled to one another in such a way that tensioning one Bowden cable arrangement simultaneously leads to relaxation of the other Bowden cable arrangement and vice versa.

The lumbar support according to the invention is suitable for use in the backrests of motor vehicle seats or office chairs, but is not restricted to this preferred area of application. In principle, the lumbar support according to the invention can be used wherever individual and reliable support of the spine, in particular the lumbar or lumbar region of the spine, of a user is desired. For example, use of the lumbar support according to the invention in health pillows, mattresses or the like is also conceivable.

The archable support element of the lumbar support according to the invention is preferably in one piece, flat and made of plastic, but the

Invention also on lumbar supports with multi-part archable support elements and in particular can also be used on lumbar supports with mesh mats as archable support elements or the like.

The present invention is explained in more detail below with reference to the drawing based on a preferred embodiment.

1 shows a top view of the back of a lumbar support according to a preferred embodiment of the present invention,

Fig. 2 shows a plan view of the front of the lumbar support shown in Fig. 1, and

3A and 3B show a comparison of the curvature that can be achieved with the aid of conventional lumbar supports with the curvature that can be achieved with the aid of the present invention.

1 shows a lumbar support in accordance with a preferred exemplary embodiment of the present invention, a rear view being shown.

The lumbar support comprises an archable support element which, depending on the specific embodiment, is also referred to as a lordosis shield or lordos basket. The archable support element comprises a first flat support section 1 and a second flat support section 2, wherein the two support sections 1, 2 can each be made of plastic. The support sections 1, 2 are connected to one another via longitudinal webs 3, which are formed in one piece with the support sections 1, 2 or can be fastened to them in any manner. The longitudinal webs 3 each have a strip-like shape and are constructed in accordion or wave-like fashion in such a way that they have elevations and depressions which are alternately arranged in their longitudinal direction and are thus designed to be elastic. Because of this configuration, the longitudinal webs 3 have such flexibility in the longitudinal direction that when the support sections 1, 2 are loaded with an excessively high load, that In the case of a so-called misuse, this means that the entire lumbar support can be elastically deflected, since, due to the alternating elevations and depressions, they can be compressed to a greater or lesser extent depending on the load. At the same time, however, the longitudinal webs 3 are designed in such a way that they ensure sufficient rigidity of the lumbar support in spite of their longitudinal flexibility in a normal load case. In principle, only one such longitudinal web 3 or more than two such longitudinal webs 3 can be provided between the two support sections 1, 2.

The support sections 1, 2, which serve as an archable support element and provide a support or support surface for a person leaning against it on their front side, are slidably mounted along rods 4, which can be bent as shown in FIG. 1. When using the lumbar support shown in FIG. 1 in a backrest of a seat, these rods 4 run in the height direction of the backrest, so that the height position of the lumbar support in the backrest can be adjusted by adjusting the support sections 1, 2 along the rods 4. For this purpose, a first cross strut 5, for example made of metal, is provided, which is attached to the bars 4. In addition, a second cross strut 6, which can also be made of metal, is provided, which is attached to the bars 4 above the first cross strut 5. A first Bowden cable is supported with its casing 18 on the lower cross strut 5, as shown in FIG. 1, while the wire 19 of this first Bowden cable runs under the cross strut 5 or through the cross strut 5 and is coupled to a spiral spring 20 which is coupled is in turn attached to an upper end section of the support section 1 and, for example, is suspended there (cf. reference numeral 23 in FIG. 1). A second Bowden cable is supported with its cover 21 on the upper cross strut 6, the wire 22 of this second Bowden cable, which is displaceably mounted in the cover 21, running under the cross strut 6 or through the cross strut 6 and also in the region of the Attachment point of the coil spring 20 is attached to the upper end portion of the support portion 1. In the embodiment shown in Fig. 1 guides 7 are attached to the support section 1, through which the rods 4 run, so that the support section 1 with the support section 2 attached to it via the longitudinal webs 3 can be moved along the rods 4 via the guides 7.

1 that the support sections 1, 2 can be moved downward along the rods 4 by tensioning the first Bowden cable 18, 19, while the support sections 1, 2 can be moved along the bars by tensioning the second Bowden cable 21, 22 Bars 4 are moved upwards. According to a particularly preferred embodiment, the two Bowden cables form a circumferential Bowden cable system in such a way that a common actuating device is provided for both Bowden cables, as is indicated in FIG. 1 with the aid of an actuating device 24 which is connected to the first Bowden cable. is also coupled to the second Bowden cable. In the exemplary embodiment shown, this actuating device 24 is designed in the form of a motor-operated worm wheel drive, the two Bowden cables being coupled to the actuating device 24 in such a way that tensioning the wire 22 within the casing 21 simultaneously leads to relaxation of the wire 19 within the casing 18 and vice versa, so that the height of the lumbar support along the bars 4 is possible in a simple, effective and energy-saving manner using the actuating device 24.

In addition, the lumbar support shown in FIG. 1 includes an adjustment mechanism in order to be able to adjust the curvature of the support sections 1, 2 in two curvature directions that are essentially opposite to each other, so that the support or support surfaces of the support sections 1, 2 with respect to the back or the spinal region of a person leaning against it can assume both a convex and a concave shape.

This will be explained in more detail below with reference to FIG. 3, in FIG. 3A different curvatures that can be achieved with the aid of a conventional lumbar support are shown. As can be seen from Fig. 3A, the conventional lumbar support can only be arched in one direction of curvature out of the plane defined by the archable support element 1, 2 in the non-arched state, the crown of the arch always being moved towards the back of the corresponding person, so that the archable support element 1, 2 realizes a convex support or support surface in the arched state. As shown in FIG. 3B, the lumbar support according to the invention is no longer restricted to the convex curvature described above, but it is equally possible for the curvature of the archable support element 1, 2 to be brought about in the opposite direction of curvature in such a way that the crown of the arch is in each case leaning against it Person is moved away so that the archable support element forms a concave support or support surface.

The adjustment mechanism of the lumbar support shown in FIG. 1 is made up of two separate adjustment mechanisms in order to achieve the curvature of the support sections 1, 2 in the two curvature directions, one adjustment mechanism being provided for the conventional convex curvature, while the other adjustment mechanism is provided The concave curvature is used. Both adjustment mechanisms are implemented in the illustrated embodiment in the form of Bowden cable arrangements. Of course, deviating configurations, e.g. B. with the aid of a spindle drive or the like, are conceivable.

The adjustment mechanism provided for the convex curvature is, as with conventional lumbar supports, essentially arranged on the back of the lumbar support and effective. In the exemplary embodiment shown, this adjustment mechanism comprises a Bowden cable, the sheath 8 of which, as shown in FIG. 1, is supported in the region of the upper end section of the support section 1 on a socket or the like, the wire 9 of this Bowden cable which is displaceably mounted in the sheath 8, as also in FIG Fig. 1 shown from the upper end portion of the support portion 1 down to a pulley 11 is guided. The deflection roller 11 can be pivoted via a holder 12 attached to a lower end section of the support section 2 (cf. reference numeral 13), so that the deflection roller 11 with the holder 12 is held in a variable manner with respect to the support section 2 (and with respect to the support section 1) such that that between the holder 12 and the support sections 1 , 2 included angles is changeable. The pivotability of the deflecting roller 11 ensures that when the lumbar support is in operation and when the Bowden cable 8, 9 is actuated, the deflecting roller 11 can always assume the optimal position for maximum power transmission and minimal friction. As shown in FIG. 1, the wire 9 is guided back through the deflection roller 11 back to the upper end section of the support section 1, where the wire 9 is finally fastened in a suitable manner (cf. reference number 10).

From the above description it is readily apparent that by tensioning the wire 9 with the aid of the Bowden cable, the lower end section of the support section 2 can be moved towards the upper end section of the support section 1, so that the desired one depends on the degree of tensioning of the wire 9 sets convex curvature of the support sections 1, 2, as is shown by way of example in the left area of FIG. 3B. It should be noted that the front sides of the support sections 1 and 2, which are not visible in FIG. 1, represent the convexly curved or curved support or support surfaces for the lordosis area.

The adjustment mechanism for the concave curvature of the support sections 1, 2 also comprises a Bowden cable arrangement, wherein the casing 14 of this Bowden cable arrangement, like the casing 8 of the other Bowden cable arrangement, is supported on the upper end section of the support section 1 on a bushing or the like. Starting from the upper end section of the support section 1, the wire 15 of this Bowden cable arrangement initially runs down along the rear side of the upper support section 1, an opening being formed between the lower end section of the support section 1 and the longitudinal web 3 on the right in FIG. 1, so the wire at the lower end section of the Support section 1 to the front of the support section 1 and the corresponding longitudinal web 3 can emerge.

As can be seen in FIG. 2, which represents a front view of the lumbar support of FIG. 1, the wire 15 runs from this opening along the front of the longitudinal web 3 to the lower support section 2, where it is deflected in the width direction of the support section by means of deflection means 17 2 is first led to the other longitudinal web 3 and is then again guided along the front of the other longitudinal web 3 to the lower end section of the support section 1. An opening is also formed between this other longitudinal web 3 and the lower end section of the support section 1, so that the wire 15 can be guided back to the rear of the support section 1 through this opening.

As can be seen from FIG. 1, starting from this opening between the lower end section of the support section 1 and the longitudinal web 3 on the left in FIG. 1, the wire 15 runs back to the upper end section of the support section 1, where it is attached or attached in a suitable manner is attached (see reference number 16).

The deflection means 17 shown in FIG. 2 are preferably designed to be as flat as possible, since the front of the support section 2 is the support or support surface for the lordosis area of the person leaning against it. In principle, it is sufficient if the deflection means 17 - as shown in FIG. 2 - is a narrow attachment, which is attached to the front of the lower support section 2, so that the wire 15 is in a relatively narrow space between this attachment and the top of the lower support section 2 can be guided in the desired direction along a guide groove or guide groove.

It can be seen from the above explanation of FIGS. 1 and 2 and the representations of FIGS. 1 and 2 that when the wire 15 is tensioned, that is to say when pulling the wire 15 back into the sheath 14, the lower support section 2 will move forward to the upper support section 1 in Fig. 2, so that depending on the degree of tensioning of the wire 15, the front sides of the support sections 1 and 2 one more or represent less strong concave support or support surface for the person leaning against it.

Preferably forming the two Bowden cables 8, 9 and 14, 15, which are provided for the convex or concave curvature of the archable support element comprising the two support sections 1, 2 (and the two longitudinal webs 3), similar to the Bowden cables 18 provided for height adjustment, 19 or 21, 22 a circumferential Bowden cable system such that tensioning one Bowden cable is accompanied by relaxation of the other Bowden cable and vice versa. The two Bowden cables 8, 9 and 14, 15 can accordingly - as indicated in FIG. 1 - be coupled with a common actuating device 23, for example in the form of a motor-operated worm wheel drive, similar to the actuating device 24, the actuating device 23 being designed in this way, that when the wire 9 is pulled out of the sheath 8 by the actuating device 23, the wire 15 can slide back substantially into the sheath 14 and vice versa. In this way, with the aid of a single actuating device, it is possible to switch continuously between a conventional convex curvature of the support sections 1 and 2 and the longitudinal webs 3 between them and a concave curvature, each with individual adjustment of the degree of curvature, depending on the needs of the respective user and with little effort.

Claims

PATE N TAN SPEECH

1. lumbar support, with an archable support element (1-3), and with an adjusting mechanism (8-17) for adjusting a curvature of the archable support element (1-3) in a first curvature direction, in which the archable support element (1-3) forms a convex support surface, and in a second direction of curvature, in which the archable support element (1-3) forms a concave support surface.

2. lumbar support according to claim 1, characterized in that the lumbar support is designed such that the first and second curvature directions are essentially opposite to each other from a plane which is defined by the archable support element (1-3) in the non-arched state ,

3. lumbar support according to claim 1 or 2, characterized in that the adjusting mechanism (8-17) is designed such that it has a tensile force on a rear side of at least one end section for adjusting a curvature of the archable support element (1-3) in the first curvature direction of the archable support element (1-3) and for adjusting a curvature of the archable support element (1-3) in the second curvature direction exerts a tensile force on a front side of at least one end section of the archable support element (1-3).

4. lumbar support according to one of the preceding claims, characterized in that the adjusting mechanism first adjusting means (8-13) for adjusting a curvature of the archable support element (1-3) in the first direction of curvature and second adjustment means (14-17) for adjusting a curvature of the archable support element (1-3) in the second curvature direction.

5. lumbar support according to claim 4, characterized in that the first adjusting means (8-13) engage on a rear side of the archable support element (1-3).

6. lumbar support according to claim 4 or 5, characterized in that the second adjustment means engage on a front of the archable support element (1-3).

7. lumbar support according to one of claims 4-6, characterized in that the first adjusting means (8-13) and the second adjusting means (14-17) each have a tension element (9; 15) for exerting an adjusting force on at least one end section of the archable Include support element (1-3) for curvature in the first curvature direction or for curvature in the second curvature direction.

8. lumbar support according to one of claims 4-7, characterized in that the first adjustment means comprise a Bowden cable arrangement (8, 9).

9. lumbar support according to claim 8, characterized in that a sheath (8) of the Bowden cable arrangement of the first adjusting means is supported on a first end section of the archable support element (1-3), a wire (9) slidably arranged in the sheath (8) is led to a second end section of the archable support element (1-3) in order to exert an adjusting force on the archable support element (1-3) for arching in the first arching direction.

10. lumbar support according to claim 9, characterized in that the wire (9) of the Bowden cable arrangement of the first adjusting means via deflection means (11) is guided back to the first end section of the archable support element (1-3) and is coupled there to the first end section, wherein the deflection means (11) are coupled to the second end section of the archable support element (1-3).

11. lumbar support according to claim 10, characterized in that the deflecting means comprise a deflecting roller (11).

12. lumbar support according to claim 10 or 11, characterized in that the deflection means (11) are pivotally coupled to the second end portion of the archable support element (1-3).

13. lumbar support according to one of claims 4-12, characterized in that the second adjusting means (14-17) comprise a Bowden cable arrangement.

14. lumbar support according to claim 13, characterized in that a sheath (14) of the Bowden cable arrangement of the second adjusting means is supported on a first end section of the archable support element (1-3), a wire (15) slidably mounted in the sheath (14) is guided from the first end section of the archable support element (1-3) to a second end section of the archable support element (1-3) in order to exert an adjusting force on the archable support element (1-3) for arching in the second arching direction.

15. lumbar support according to claim 14, characterized in that the wire (15) of the Bowden cable arrangement of the second adjusting means runs from the first end section of the archable support element (1) first in the longitudinal direction of the archable support element (1-3), then through an opening in the archable support element (1-3) is guided along the front of the archable support element (1-3) to the second end section of the archable support element (1-3), from there along the front of the archable support element (1-3) through a further opening in the archable support element (1 -3) and along the back of the archable support member (1-3) in the longitudinal direction of the archable support member (1-3) to the first end portion of the archable support member (1-3) where the wire (15) with the first End portion of the archable support element (1-3) is coupled.

16. lumbar support according to claim 15, characterized in that the wire (15) of the Bowden cable arrangement of the second adjustment means (14-17) is guided via deflection means (17) on the front of the archable support element (1-3).

17. lumbar support according to one of the preceding claims, characterized in that the archable support element comprises a first support section (1) and a second support section (2) which are connected to one another via at least one longitudinal web (3) extending in the longitudinal direction of the archable support element.

18. lumbar support according to claim 17, characterized in that the at least one longitudinal web (3) is designed such that it has flexibility in the longitudinal direction of the archable support element.

19. lumbar support according to claim 17 or 18, characterized in that the at least one longitudinal web (3) has alternately arranged elevations and depressions in the longitudinal direction of the archable support element, each of which extends in the transverse direction of the at least one longitudinal web (3) in order to bring about flexibility in the longitudinal direction of the archable support element.

20. lumbar support according to one of claims 17-19, characterized in that the archable support element comprises at least two longitudinal webs (3) spaced apart from one another in the width direction of the archable support element, each connecting the first support section (1) to the second support section (2).

21. lumbar support according to one of claims 13-16 and claim 20, characterized. that the wire (15) of the Bowden cable arrangement of the second adjustment means (14-17) runs through the one opening in the archable support element and then along the front of the one longitudinal web (3) to the second end section of the archable support element, and that the wire (15 ) of the Bowden cable arrangement of the second adjusting means (14-17) extends from the second end section of the archable support element along the front of the other longitudinal web (3) to the other opening in the archable support element.

22. lumbar support according to one of the preceding claims, characterized in that actuating means (23) are provided for actuating the adjusting mechanism.

23. lumbar support according to claim 22 and one of claims 4-16, characterized in that common actuation means (23) are provided for the first adjustment means (8-13) and the second adjustment means (14-17) of the adjustment mechanism.

24. lumbar support according to claim 23, characterized in that the common actuating means (23) are designed such that an adjustment of the first adjustment means (8-13) to enlarge a curvature of the archable support element (1-13) in the first curvature direction at the same time an adjustment of the second adjusting means (14-17) leads to a reduction in the curvature of the archable support element (1-3) in the second curvature direction and vice versa.

25. lumbar support according to one of the preceding claims, characterized in that the archable support element (1-3) is slidably mounted in its longitudinal direction along guide means (4), and that a further adjustment mechanism (18-23) for adjusting the adjustable support element ( 1-3) is provided along the guide means (4).

26. lumbar support according to claim 25, characterized in that the further adjusting mechanism (18-23) comprises a Bowden cable arrangement.

27. lumbar support according to claim 26, characterized in that the Bowden cable arrangement a first Bowden cable (18, 19) for adjusting the archable support element (1-3) in a first direction along the guide means (4) and a second Bowden cable (21, 22) for adjusting the archable support element (1-3) in a second direction opposite the first direction along the guide means (4).

28. lumbar support according to claim 27, characterized in that a sheath (18) of the first Bowden cable and a sheath (21) of the second Bowden cable are each supported on brackets (5, 6) coupled to the guide means (14), while a wire ( 19) of the first Bowden cable and a wire (22) of the second Bowden cable are each coupled to the archable support element (1-3).

29. lumbar support according to claim 28, characterized in that the wire (19) of the first Bowden cable or the wire (22) of the second Bowden cable is coupled via a spring element (20) with the archable support element (1-3).

30. lumbar support according to one of claims 27-29, characterized in that common actuating means (24) for the first Bowden cable (18, 19) and the second Bowden cable (21, 22) are provided such that a tensioning of the first Bowden cable simultaneously one Relaxes the second Bowden cable and vice versa.