DK3050465T3 - Seating furniture - Google Patents

Description

The invention is directed to the seating furniture, which comprises at least one seat and at least one backrest, wherein two or more elongated profiles, preferably each with round outer cross-sections, are attached to a supporting part in the area of the seat, which profiles rise upwards within the plane of the backrest parallel to each other, but without a direct rigid connection with each other up to about the top edge of the backrest, and wherein the backrest is divided in the vertical direction into several backrest segments, preferably into three or more backrest segments, which all habe the shape of a strip of horizontal longitudinal extension, each comprising an inner, at least partially planar supporting structural element for supporting a padding of a soft material attached thereto or encompassing it, wherein an inner, at least partially planar structural element coprises a passage for each profile, the inner surface of which encompasses or embraces the regarding profile completely or at least partially.

The most seating furniture with the exception of stool comprises not only a seat, but also a backrest, whose primary function is to support the back of a seating person, thereby allowing them not-fatiguing sitting. For the purpose of stability prior art of backrests comprise an inner framework which is very rigid; in some cases the backrests are provided with a tilt adjustment. The person sitting on such a furniture can lean back and forward, but lateral torsional movements of the upper body of the seated person are not tolerated by such a construction. Additionally, instead of the torsionally motion the sitting person have to lean forward to pass the own backrest as an obstactle; this leads to complicated and potentially even painful twist of the upper body, especially in the region of the lumbar spine. DE 20 2006 016 346 U1 discloses a backrest of chair, which is subdivided into a plurality of backrest segments, which are respectively fixed to two profiles. The inner sides of whose profiles encompassing recesses in the backrest segments cylindrical, they are guided by the profiles along their entire length, so that the alignment of each backrest segment is completely predetermined by the encompassed profiles. Although the rigid adjustment of the backrest to the curve of the spine of a person is provided by the profiles, which comprise straight sections connected through bends merging into on another. These bends are sized for modelling the curve of the spine. However, such an adjustment is only limited to the persons with a standardized size. For example, if a child is sitting on the chair, which was designed for an adult, the shape of the backrest will not fit. It would be preferably, if all backrest segments could serve for the specific requirements of each sitting person. This is not the case for the rigid construction of DE 20 2006 016 346 U1. Additionally, these bents hinder the assembly of the chair, since the displacement of the individual backrest segments is hindered. Since bends of the profile lead to the notch effect, which means a stress concentration and therefore lack of stability, the above mentioned document suggests solid rods as profiles, but due to the resulted high weight of the backrest of the seating furniture an unfavorable centre of gravity would be the consequence, which would reduce the stability of such a chair. Finally, the solid rods are extremely rigid and rarely flexible, so that the furniture described in DE 20 2006 016 346 U1 is relatively rigid and therefore not comfortable. Furthermore, in the construction from DE 20 2006 016 346 U1 the rods are to be anchored to the rear edge of the seat, so that a torsional movement or a deflection of the backrest would result in a deformation of the seat and would cause a feeling of insecurity of a sitting person.

The DE 20 2012 000 596 dexcribes a further seating furniture, which is rather similar to that of the invention.

The disadvantages of the prior art described above resulted in the problem, which intitiated the invention of a kind of seating furniture with a backrest which individually imitates as many biomechanically relevant movements of the upper body as possible.

The solution to this problem is achieved by creating an articulated connection between the inside of the recess in the structural element and the encompassed or enclosed by this profile; this connection allows not only rotation of the respective backrest segment about the longitudinal axis of the profile, but also at least a tilting of the respective backrest segment about an axis which is perpendicular to the longitudinal axis of a profile, in particular about a connecting line between the two profiles following the longitudinal axis of the relevant backrest segment.

By thus the respective structural element can tilt about at least one axis, which is perpendicular to the longitudinal axis of a profile, preferably about an axis, which is transverse to the respective seat direction and / or about an axis within the surface of the relevant at least partially flat structural element, that the backrest segment which is guided on the profiles by the inner structural element, can adapt its orientation to the adjacent back section and nestle up optimally.

The frequently occurring pain-inducing muscle hardening, so-called trigger points, also referred to as myogelosis, can be caused by a sudden overload, but also in particular by a long-lasting inappropriate stress such as a one-sided static sitting position. These are typical pain points on the musculoskeletal system, and they can lead to muscular dysbalances, for example in the area of the spinal column.

The elastic formability of the profiles together with the mobility of each of the backrest segments according to the invention represents a constructive approach to ensure an additional sensomotoric degree of freedom, in order to counteract the typical lack of activity of the different muscle groups of a seated person.

Due to the segmental construction of the backrest and the different rotational mobility of the individual backrest segments in the area of the upper part of the body, with regard to the sensomotoric function of a seated person such a backrest is no longer perceived as a rigid object, which invites to a static sitting position, but rather as a formable object, which adapts itself to the respective posture of a body, or it can at least interact with it and thus be influenced. There is a constant feedback from the human musculoskeletal system on the subsequent movement of the backrest and those sensory feedback to the central control processes in the brain, which in turn exerts influence on the musculoskeletal system. This constantly occurring sensomotoric cycle creates different activity patterns on the pe ripheral muscles, so that the sitting position is not static as in conventional seating, but changes dynamically. As a result, the initiation of trigger points or Myo-geloses can be counteracted.

Thereby, noticeable pressure marks of the edges of individual backrest segments are excluded due to the mobility of individual backrest segments created in this way. Such articulated connections and guides between the backrest segments and the profiles not only contribute to an increase in convenience, but also allow a uniform pressure absorption in the entire backrest, so that normally all backrest segments can be charged approximately equally. The backrest segments always nestle optimally against the respective back part and also laterally support the upper part of the body for torsion movements.

This is achieved in particular through contribution to the further developments of the invention, according to which the each of the profiles have a round outer cross-section, so that a relative rotational mobility is given between the profiles and those completely or partially enclosing recesses, so that the backrest segments can change their position if necessary, which is important especially for the torsional movements in the upper body of a seated person. The profiles run parallel to each other. Preferably, they are not connected to one another, neither at the level of the backrest segments nor between them, at least not by a rigid connection, so that they can bend to a certain extent, in particular also in different ways, which is important for the above-described torsional movements of a seated person.

If the two profiles are not connected or at least not rigidly connected to one another in the part of their upper ends, such a bending mobility increases along the profiles from the bottom to the top, in particular as a progressive increase. Thus, a maximum degree of freedom is possible for each backrest segment, in particular for rotational movements about a vertical axis as well as for tilting movements about a horizontal axis in the longitudinal direction of the relevant backrest segment.

If the profiles are kink-free, that means they are either straight stretched or extend along curved, kink-free curves, the backrest segments can also be moved in the vertical direction, for example, they can be pushed for mounting on the profiles from the upper end of the profiles.

An articulated connection can be realized in particular by the contact area between the inside of the recess in the structural element and the encompassed or enclosed profile via an extension, which is parallel to the longitudinal axis of the engaged profile and is annularly closed or at least partially arched or ring-shaped or arch-shaped, which is smaller than the length of the recess, preferably smaller than the outer circumference of the profile, in particular smaller than the diameter of the profile.

Although the backrest segments and their inner structural elements are preferably neither bolted to the profiles nor otherwise rigid and immovably connected, so as not to hinder their relative movements. Nevertheless, care should be taken to ensure that the height of the backrest segments does not rise to a greater extent. On the one hand, this can be achieved by spacer elements inserted between adjacent backrest segments, so that the backrest segments successively support each other. Furthermore, it would also be conceivable, for example, to anchor annular support elements on the profiles, for example by using adjustable screws, which press against the profiles and each of them would support every backrest segment.

Furthermore, it would be possible to provide such or another, annular (supporting) element with a dome-shaped or spherical outer surface, on which then a complementary, hollow spherical part on the inside of the profile encompassing recess is movably mounted like a ball joint.

Such a (supporting) element or a (ball) joint element could be anchored to the relevant profile, for example by means of adjustable screws pressing against the profile, or it could also be guided displaceable, in which case the height position of a backrest segment should be specified otherwise, for example, by intermediate or spacer elements.

In such a case there would be a contact area between the convex outside of an annular support or joint element encompassing an approximately vertical profile and having a dome-shaped or spherical surface, and the concavely curved inside of a counterpart encompassing that support or joint element externally and being arranged in the regarding recess of a backrest segment.

For this contact area should apply that its maximum, parallel to the longitudinal axis of the encompassed profile extension is smaller than the length of the recess in the respective backrest segment, preferably also smaller than the outer circumference of the encompassed profile, in particular smaller than the diameter of this profile.

Another aspect is that the recesses in a structural element for a backrest segment do not require a completely closed ring-shaped inside. It would also be conceivable that the respective recess has a longitudinal slot, so that the mobility is increased even further, in particular if the structural element is made of an at least limited flexible material such as plastic so that such a slot could expand under certain conditions. As a result, it would be possible, for example, to dimension the inner cross-section of a recess such that it is slightly smaller in the force-free state than the outer cross-section of the relevant profile. This would allow an elastic expansion, wherein a restoring spring force is caused, which presses the inside of the respective recess against the outside of the profile and thus creates a frictional engagement, which holds the relevant backrest segment at its once set position. Such a longitudinal slot would be conceivable also with an annular support element with dome-shaped or spherical outer surface.

At their lower ends, the profiles may be optionally/selectively connected to each other, and/or connected to a supporting element of the chair frame. Such a supporting element is preferably an element arranged directly on a rotary or chair frame, preferably made of steel or another metal. Although it may also be conceivable to bond the profiles to the rear edge of the seat, however, this is not recommended due to the insufficient stability of the edge of the seat in general. In addition, the bending movements of the backrest would then be continued in the seat and could cause a feeling of insecurity in a seated peson, which can be avoided if there is no direct connection between the profiles of the backrest and the seat according to the invention. Therefore it is better to guide the profiles of the backrest either individually or together around the rear edge of the seat and then to connect beneath the seat and without contact to the seat, directly to the chair frame or the swivel mechanism, in particular on a supporting column of a swivel base.

The different backrest segments can be identical to each other, but this is not necessary. On the one hand, they can differ from one another ergonomically, but on the other hand, they can also differ under aesthetic point of view. Backrest segments which are optimized for different body parts can be provided, for example, a backrest segment with a lordosis in the lower part of the backrest, one or more backrest segments with armrests, a backrest segment with a headrest, etc. Further, the backrest segments could differ in their flexibility and/or upholstery, for example, the backrest segment which serves as a headrest can be softer and smoother than the others. For example, variable widths and/or lengths of individual backrest segments, different upholstery materials and/or colors, etc., could be considered as aesthetic criteria.

By attaching two or more elongated profiles to a seat supporting chair frame, which are within the plane of the backrest, parallel to each other, but without a direct rigid connection with each other up to about the top edge of the backrest, wherein the backrest is divided in the vertical direction into several segments, each having the shape of a strip of horizontal longitudinal extention with one from the top of the strip to the underside continuous channel opening for each profile, the result is an extraordinary flexible arrangement, since the two profiles can move relative to each other, so as required by the current body posture of a seated person. The construction without a rigid frame, which supports the backrest, lead to the significant improvement of the backrest flexibility. According to the invention, the profiles can bend in different ways, for example one profile to the front, the other to the rear, so that a backrest segment, which joins the profiles together is now not transverse to the seat direction, but obliquely, according to the connecting line between the bent profiles. Due to the bending gradually increasing along the profiles, at different heights, the backrest segments are subject to different inclinations or tiltings, which are in particular gradually increasing from the bottom to the top. This corresponds to the gradually increasing distortion of the upper body of a person along its spine. The design of the backrest in its rough form is based on the construction of the human spine, thereby a backrest segment corresponds to a vertebra together with connected ribs. Therefore, any rotational movement of the spine of a seated person can be imitated by the backrest segments, which extend approximately parallel to the ribs. The rotational movement is supported and thus counteracts fatigue in the back, hip and pelvic area while sitting.

An inner load-bearing structure in the form of an inner supporting structural element, in particular in the area of at least one continuous channel opening, ensures that each of the backrest segments remains flexible and on the one hand adapts to the movements of the user but on the other hand also provides a sufficiently stable connection of the backrest segments to the profiles, which are anchored on the chair frame and towering from there. The person can thus also swingingly sit down on the seat according to the invention, without unintentionally folding the individual backrest segments backwards or to the side. At least one supporting structural element is located within the involved backrest segment, the supporting structural element is designed on the one hand to support the flexibility of the backrest segment, but on the other hand also to give the backrest segment sufficient strength.

By the invention, the load-bearing structure of the human body is recreated in the area of the backrest, and thereby, the mechanics is optimally adapted to the freedom of movement of the human body. Here, the towering profiles take over the supporting structure of the human spine, as well as their flexibility towards movements forward or backward. The flexibility against torsional movements results from the interaction of two or more, approximately parallel to each other running profiles with the connecting backrest segments, as a torsion of the body leads to a lateral rotation of the backrest segments, which is made possible by the separate mobility of the supporting profiles. Overall, this results in a system with uniquely natural movement patterns, which comes distinctively close to the entire function of the human spine. These movement patterns are neither disturbed by fasteners such as screws or rivets nor affected by a deviating from the circular cross-sectional geometry of the profiles. In particular, the torsional capability of the backrest according to the invention increases from the bottom to the top, as a result of which the corresponding function of the human spine from the lumbar region to the cervical region is likewise simulated. In such a comparison the backrest segments according to the invention can be assigned to the human ribs. The human ribs can also - for example, when lifting and lowering the chest for breathing - tilt to some extent on a horizontal axis. This freedom of movement is provided by the flexibility of articulation, according to the invention, between the towering profiles and the backrest segments extending transverse thereto or, respectively, their supporting structural elements. In this context, the term "flexibility of articulation" should be understood only in a figurative sense, because a joint in the usual sense is notexistent; nor were there any molded tilt or pivot axis on the profiles, but only a theoretical tilt axis corresponding to a direction about which the backrest segments and their structural elements can tilt.

It has proved to be advantageous that the axis which is perpendicular to the longitudinal axis of a profile, and about which an inner structural element is tiltably guided by the profiles, in turn, is pivotable about the profile at least within a penetrated by the respective profile surface, so that even in the case of torsional movements of a person sitting on the chair, the backrest segment around the person's spine guided by the inner structural element on the profiles can be adjusted in its orientation of the adjacent back section and can optimally cling to it.

The invention can be further developed to the effect that an inner structural element have a recess for fully or at least partially encompassing or enclosing each profile, and the light cross-section of the recess is smaller at at least one point between its upper and lower mouth than in the part of a mouth. As a result, the assembly is facilitated because the threading of the profiles is made easily through the extended at their mouths recesses when attaching a backrest segment on the towering backrest profiles of the chair frame.

The invention recommends that the course of the inside of a recess in an inner structural element for completely or at least partially encompassing or enclosing a profile has a point along its longitudinal direction where its clear cross-section is minimal. Such a shape with a narrow cross-section which is enlarging in both directions from a narrowing in a central part allows a tilting movement about an axis direction in the part of the constriction.

At the location of its minimum clear cross section, a continuous recess should be equal to or smaller than the cross section of a profile penetrating the inner structural element, so that the latter is closely embraced by the supporting structural element and thus ensures good guidance of the backrest segments on the profiles at tilt adjustments.

It is within the scope of the invention that the location of a tilting axis or a tapered or minimal clear cross-section of a recess in an inner structural element is closer to the mean height level of the relevant backrest segment than the top and bottom of the relevant backrest segment. As a result, in the case of a tilt adjustment of a backrest segment about an approximately horizontal axis, its central area in the vertical direction remains unchanged in place, and only the areas near the upper and lower edges of the respective backrest segment are displaced relative to the plane defined by the approximately parallel profiles. A recess in an inner structural element of a backrest segment can constantly expand from the location of a tilt axis or of a tapered or minimal clear cross section in the direction of an upper and/or lower-side opening of the recess. This corresponds to the fact that by a tilting, the degree of adjustment always increases with increasing distance from the tilting axis and there requires the additional space.

Further according to this invention, a recess in an inner structural element of a backrest segment enlarges from the location of a tilting axis or a tapered or minimal, clear cross-section up to an upper and/or lower-side mouth of the recess along a cone or conical surface. As a result, the direction of a tilting axis is not predetermined or restricted in the case of a tilting movement and at the same time an optimum clearance for a tilting movement is created, so that tilting is also possible with a twisted backrest.

When a recess in an inner structural element of a backrest segment enlarges from the location of a tilting axis or a tapered or minimum clear cross section to an uppermost orifice and to a lower mouth of the recess along a respective cone or conical surface, then tilts in both movement directions are possible, i.e. top to front and bottom to back, as well as top to back and bottom to front.

The invention is further characterized in that the openings of the two cone or conical surfaces point in different directions, relative to the longitudinal axis of a gripped profile, each corresponding to an extension from an inner constriction to the outer mouths. A preferred design rule states that at least one opening angle of a conical or conical surface is equal to or greater than 1°, preferably equal to or greater than 2°, in particular equal to or greater than 4°. Such an angle provides a latitude of movement required for the automatic adjustment of an optimum tilt.

On the other hand, at least an opening angle of a cone or conical surface should be equal to or less than 15°, preferably equal to or less than 10°, in particular equal to or less than 7°, since if the tilt angles are too large, this could lead to unasthetic misalignments of individual backrest segments in unused seating furniture.

Particular advantages are provided by an arrangement, wherein the opening angle of the two cones or conical surfaces are the same size. Thus, at a maximum tilt, both mouth regions come into contact with the engaged profile at about the same time, and thus undergo a stop which no longer permits further tilting. In this end position, both conical sections equally contribute to the derivation of further tilting forces.

An arrangement according to the invention can be completed by a disk-shaped part for covering some areas of the upper-side of the uppermost backrest segment, with two recesses shiftet laterally from each other or recesses for inserting or passing one profile through each recess. By such a covering cap can be avoided that the moisture or even a liquid penetrates into the cavity in the inside of a pipe and cause for example corrosion there.

At least one spacer element can be inserted between two adjacent backrest segments, which prevents the individual backrest segments from being frictionally engaged or even pushed over one another and thus losing their movement function. If neighboring backrest segments according to the invention do not touch each other directly, this results in maximum mobility. In particular, backrest segments arranged directly one above the other can tilt independently of one another in different directions.

If a spacer element between at least two adjacent backrest segments has at least one skirt or sleeve extending into a recess of an inner structural element, then direct contact between the respective mouth of a recess in an inner structural element and the profile, which goes through it, can be avoided. As a result, the permissible tilt angle can be limited so that there is no excessive stretching even in the region of maximum constriction within a receiving channel. A special feature of an skirt or sleeve of a spacer element extending into a recess of an inner structural element between at least two adjacent backrest segments is that it is at least partially elastically deformable. The object of such an skirt is to cushion gently the range of motion for the possibility of tilting a backrest segment, without audible or noticeable striking of the recess of a structural element on the lateral surface of the profile.

Two skirts or sleeves which are preferably parallel to one another can be connected to one another via an intermediate web, preferably to a disk-shaped part with two mutually parallel recesses each for the passage of one profile. As a result, the assembly of a seat according to the invention is facilitated. A further function can be given to the spacer element according to the invention, which is arranged between at least two adjacent backrest segments, by providing at least one flange abutting the mouth edge of a recess of an inner structural element or another outwardly projecting extension. Depending on whether a spacer element is fixed to a profile or only plugged, it thus takes over either the support of the immediately loaded backrest segment on the encompassed profile, or the support of the unloaded backrest segments on the underlying backrest segment. This is of particular importance since the backrest segments according to the invention are hardly able to be frictionally engaged with the encompassing profiles because of their tilting and thus they cannot keep their positions on the profile. By contrast, a spacer element placed directly below a backrest segment engages in a form-fitting manner and can easily support it.

For this purpose, the invention recommends that a flange or an enlargement of a spacer between at least two adjacent backrest segments, abutting the mouth edge of a recess of an inner structural element, is not elastically deformable. This is guaranteed, for example, in the case of material selection of metal. In any case, an elasticity should be comparatively low; as a lower limit, the elasticity of hard rubber should be considered. Although the structural element made of plastic material is better protected against local overloads than spacers made from completely inelastic materials; however, such a flange extends between two backrest segments and is thus exposed to similar loads as the intervertebral discs inserted between two vertebrae. To avoid overloading and consequent damage of the spacer elements, they should be dimensioned rather too hard than too soft. A flange or an enlargement for the passage of a profile may have an annular geometry or a curved geometry with two mutually aligned recesses. Such a double or multiple connected shape has a particularly pronounced stability.

On the other hand, it may be advantageous for the user if at least one means for locking a spacing element between two vertically adjacent backrest segments on the profile(s) is provided in one or more positions. Thus, the seated person can vary the height of the spacer elements and thus individual backrest segments and so adapt to their own ergonomic conditions. In order to enable a locking function, several variants have been proven in practice.

In the simplest case, a spacer element can be provided with an adjusting screw, which can be screwed therethrough, it presses on the engaged profile and can cause a clamping or frictional locking there. This can be done at any position along a profile; special constructive measures on a profile are not required.

Furthermore, one or more notches may be placed on at least one profile, in which spring-loaded elements of an adjustment mechanism can engage. Thus, a once-divided position is reliably maintained while the user can adjust the backrest segments as needed up or down without much effort.

Similar effects can be achieved by perforations of the profiles, in particular in the form of bores, wherein at least one movable element for engaging or latching in a notch or opening of a profile should be provided on a spacer element between two backrest segments or these supporting structural elements. This movable element preferably obtains its characteristic function by the force of at least one spring element which is biased in a direction for engagement, in particular engagement in a notch or opening or perforation of a profile and thus ensures the engagement of the movable element.

Thereby, it has proven to be favorable when a manual actuator for lifting the movable member from the respective notch or opening or hole of a profile against the force of the prestressed spring element is provided. Thus, a seated person can move the actuator of the respective spacer element and thus the mounted backrest segments up or down by simply manually pushing it, until the spring element engages again in the next intended notch, opening, hole or recess.

Between two profiles, a lateral distance, which is equal to or less than half the width of the backrest, preferably equal to or less than one third of the width of the backrest, in particular equal to or less than a quarter of the width of the backrest, should be provided. The smaller this distance, the stronger becomes the inclination of the backrest segments in an opposite bending of the two profiles. Particularly useful is a lateral distance between about 5 cm and 15 cm, preferably between 7 cm and 13 cm.

The invention is particularly suitable for backrests, which are each designed for a single person. If two profiles are provided in this case, these preferably extend on both sides of a person using the seating in question, thus taking the spine of the person in their midst; since the spine is located in front of the backrest, a cross-section through the backbone together with the two profiles preferably forms a isosceles triangle.

At least one profile should preferably have a round cross-section. Round profiles facilitate an inclination of the backrest segments, because they can rotate freely within the continuous channel openings on the round profile in the elastic area of the individual elements and thus can optimally follow the natural movements of the seated person.

Another feature of the invention is the fact that at least one profile has the shape of a tube, in particular the shape of a tube made of metal. A tube is not only an ideal compromise between a high stability on the one hand and the lowest possible weight on the other hand, but rather the reduction of the total cross section increases the elastic flexibility of a profile and thereby improves the ergonomic function of a seat according to the invention. Tubes made of metal have proved to be particularly suitable, because they are sufficiently flexible with high dimensional stability and low weight. But other materials, possibly also as a solid profile, can be used, for example, plastics, wood, bamboo or composite materials, carbon, etc.

The assembly of a seat according to the invention is facilitated by the fact that the profiles follow a kink-free course, in particular a straight stretched course or within a vertical plane in the seat direction gently curved course, so without kinks or other points of discontinuity. The curvature can be adapted to the course of a spinal column, for example a curve which is within a vertical plane curved in the sitting direction, in a S-shaped or even double S-shaped manner. A curved, similar to the shape of the spine course offers particularly seating comfort, because the backrest thus is only supportive, but never disturbing.

For fastening of the novel backrest to the chair frame, at least one profile should have in the area of its underside a bending forward or a lug projecting radially or a flat-fitting flat iron, which extends below the seat up to the frame of the chair and is attached to that. As a result, the uprising part of a profile according to the invention receives, together with the lower side fitting edge, an approximately L-shaped form. The fastening can be done by welding, gluing, riveting or screwing.

If - as the invention further provides - two profiles are arranged side by side - seen in the seating direction at about the same height - so two attached thereto flat irons each within a common plane, in each case their two upstanding legs would be parallel to the plane of the backrest, and the two approximately horizontal legs would each be parallel to the plane of the seat. It is therefore advisable to connect these two flat irons together and produce them as a single part, which allows a common fastening of the backrest segments bearing profiles. Preferably, however, only the two lower, approximately horizontally extending legs should be connected to each other, while the upwardly projecting legs should not be connected to each other in order to perform different movements. The invention goes even further and recommends not to connect the lower legs everywhere, but only in the region of their front or free ends. The interconnected flat iron may, for example, be cut out of a common metal plate - for example by means of a laser -the slot between the two legs at its bottom in a concave curve - e.g. in the form of a semicircle - should end, so that where the opposing movements of both profiles meet directly on each other, if possible no notch effect is caused. This results in a fork-like arrangement, the (two) upstanding tines continue in the form of each attached thereto profile. In otherwise relatively stiff profiles this fork-like anchoring part determine significantly the adjustment and suspension properties of the profiles. By its design and dimensioning - choice of material, thickness, width and length of the flat, tines-like sections - the rotational behavior of the backrest segments can be decisively influenced. Here, for example, for children's chairs very different parameters to choose as for adult chairs, etc. A flat iron, for example welded or otherwise fastened to the profile, can have a bending edge extending parallel to its flat side but extending transversely to its longitudinal direction, separating two legs from one another - a leg projecting parallel to the backrest or leg extending parallel to the plane of the seat, which extends to an attachment point - at the bottom of the seat - and is anchored there. Such an aligned and installed flat iron has the advantage of a special bendability, combined with a high strength. Thus, such a flat iron acts simultaneously as a joint and as a return spring, which allows on the one hand a bending in the seat direction, but on the other hand tends to avoid.

For the seated person, it is particularly comfortable if at least one backrest segment, in particular its supporting structural element, has a curvature transverse to its longitudinal direction. This may be a simple curvature, wherein the ends of the backrest segments are slightly curved forward towards the seat surface. Other courses of the backrest segments are conceivable. For example, a back receding surface in the spine area can be provided, that provides space for backward protruding spinous processes of the vertebrae of a seated person. Each side of this central, receding area can be followed by a narrow curvature to the front, and from there then a course with a great sweep, initially laterally or even slightly backwards, but gradually pointing a little more forward. Thus, the backrest can be used as a counterpart for the people of an age group, with about the same cross-sectional shape of the back shape - so a person feels a side guide and receives a large-area contact with the backrest, but never unpleasant. On the contrary - such an intimate "interlocking” of the back part with a backrest according to the invention serves as a kind of sensor of the spine and shares any rotational movement of a person immediately with the backrest, which reacts immediately and understands this.

The invention is so versatile that it can find application in almost all kinds of seating. It can be used, for example, in office seating furniture, in particular as a (conference) swivel chair with or without castors, but also in the private sector in chairs and armchairs of all kinds.

The invention is suitable for chairs with a central base or with three, four, five or more feet, for cantilever chairs or for lounge chairs, also for child seat furniture, also in the school area. Further areas of application of the invention in car seats, seats in public transport such as bus, train, plane, etc. Also, application areas in the outdoor area, for example as a garden or gastronomy chairs, are conceivable. Even so-called standing chairs, so backrests without seat, could be designed in such a way.

Depending on the field of application of the seat according to the invention, it is advantageous if the supporting structural element is upholstered and / or foamed with a soft material. PUR foams are usually suitable for this purpose, and particular seating comfort is still achieved through the use of so-called molded foams, as used in mattresses or pillows. These foams adapt to the individual body shape and remain briefly in the embossed form and relax only slowly. Other foams are foams based on PP-E foam, PE, polystyrene, PET or based on biopolymers.

The seating furniture according to the invention, in particular the novel backrest, is also suitable for wheelchairs. Especially for a person who is limited in his mo bility, such a cooperation of the backrest helps, even with the smallest movements to prevent pressure sores. A somewhat similar principle is used in decubitus mattresses, with from the outside constantly varied pressure or stress points.

In the case of garden furniture, plastic backrest segments may also be used, without an upholstery, so that they are suitable for outdoor use. These can optionally be combined with an inner structural element or integrated into one single part.

It is within the scope of the invention, that the backrest segments can be covered with fabric, leather (imitat) or foil. In this case, a blank of a cover fabric for a backrest segment or a common blank made of a fabric for several backrest segments can be used. The user can also select individual backrest segments in different design (color, type of fabric) and so create his own individual chair.

The cover materials should be provided with zippers or hook-and-loop fasteners, for example, so that they can be removed from the backrest segments for replacement or cleaning.

Lateral armrests can be arranged on one or more backrest segments. In this case, the armrests can start at a lower segment - for example, at the free ends -and possibly initially run upwards, for example, obliquely. Such an arrangement has the advantage that no additional armrests must be mounted in a conventional manner to the seat, which saves labor and costs. The armrests can also start on an upper backrest segment; the farther up they start, the more they will swing with a body rotation of the person concerned. The shoulder area of a person is pivoted with a rotation of the upper body, and thus the arms, too, so that a lateral displacement of the armrests is quite desired.

Likewise, lateral earrests may be arranged at one or more backrest segments -for example, at the uppermost - to support the head laterally. These backrest segments may have a shorter side extent than the other, preferably lower backrest segments.

Finally, it is the teaching of the invention that a lumbar pad or cushion is arranged on one or more backrest segments, whereby the user receives a seat support, in particular in the area of the lumbar vertebra.

By selecting and acquiring various types of offered backrest segments, a buyer can choose to assemble his furniture individually - he can decide whether to have his chair with or without armrests, with or without headrests and earrests, and also with or without lumbar cushions; he can also vary the height of the interspaces between the individual backrest segments as well as the total height of the chair as a whole, whereby it is also possible to offer profiles of different lengths or a profile divided into two or more sections, which are plugged into each other and/or screwed together so that an extension is possible as necessary.

Further features, details, advantages and effects on the basis of the invention will become apparent from the following description of a preferred embodiment of the invention and from the drawing. Therein:

Fig. 1 is a perspective view of a seating furniture according to the invention, obliquely from above right;

Fig. 2 is an enlarged view of the backrest of the seat of Fig. 1 with a removed segment of the backrest;

Fig. 3 shows the seat and backrest of the seat according to Figures 1 and 2, dismantled from the chair frame, and after removal of the cover and the upholstery of the backrest, in a perspective view, obliquely from above;

Fig. 4 is a front view of the arrangement according to Fig. 3;

Fig. 5 is a side view of the arrangement of Figures 3 and 4;

Fig. 6 shows an inner structural element for a backrest segment, in a perspective slightly from above behind;

Fig. 7 is a rear view of the structural element according to Fig. 6;

Fig. 8 is a vertical section through a backrest element.

As an example for a seating furniture 1 according to the invention, Fig. 1 shows an office swivel chair, comprising on the one hand a chair frame 2 with a plurality of star-shaped cantilevered chair legs 4, extending from a central, vertical support 3, each with a steerable castor 5 in the region of the free end, on the other hand comprising a seat surface 6 arranged on the vertical support 3 and preferably adjustable in height and/or rotatable about a vertical axis and/or tiltable about a horizontal axis extending transversely to the seating direction, and also comprising a backrest 7 according to the invention.

The mechanism for raising or lowering the seat surface 6, possibly cushioned with a compression spring, preferably a gas pressure spring, and/or for rotating the seat surface 6 to the right or left, and/or tilting the same forward or backward, can be designed in accordance with the previous state of the art.

Preferably, it opens at its top in an assembly or support means for (screw) mounting or for supporting the seat surface 6. The backrest 7 is fixed in the area of such mounting or supporting device, preferably below the seat surface 6, and on the other hand above the lifting, rotating and/or tilting mechanism. This can also be done by means of screws; on the other hand, the backrest could also be inextricably linked with the mounting or supporting device for the seat surface 6, for example welded, or even integrated into a single part. A plate or a metal plate or another flat iron, which has the necessary holes, slits and/or slots or which can be welded on the mounting or support device, can serve for the backrest as a connecting part to a mounting surface at the mounting or supporting device of the chair frame.

Preferably, at least one further supporting element extends from such a connecting part in an approximately horizontal direction to behind the seat surface 6. The whole backrest 7 is supported by this.

In the region of the rear end of one or more of such supporting elements reaching up to behind the seat surface 6, several tubular profiles 8 are attached; the tubular profiles 8 can be secured in different ways, in particular welded, and extend upwards approximately to the upper edge 9 of the backrest 7; in the present example, two profiles 8, which protrude next to each other and approximately parallel to each other can be recognized. These two profiles 8 follow the same course at a constant distance next to each other. This course may be straight or may be bent one or more times, but preferably only parallel to a central vertical plane running in the seat direction. However any bending of the profiles 8, if present, should be gentle and without kinks or other discontinuities. Since these profiles 8 may be at least partially visible, they may, for example, be chrome plated. At certain intervals, these profiles can also comprise notches, holes or the like recesses or apertures.

Preferably, the profiles 8 are tubes, in particular metal tubes, because these are on the one hand very stable and can hardly be overloaded, but on the other hand they are nevertheless bend-flexible, i.e., they can be bent elastically to a certain extent, but they return again to their original, straight stretched or curved shape.

At these profiles 8, several backrest segments 10 are fixed one above the other, as shown in Fig. 1. These backrest segments 10 have the shape of horizontal strips and form together - one above the other - the backrest 7. Thereby, adjacent backrest segments 10 can touch; however, they preferably have a (small) distance, which is preferably smaller than the height of a backrest segment 10. This can be realized, for example, by the fact that - as will be explained more precisely below - one or more preferably annular spacers are located between two backrest segments 10.

Each backrest segment 10 preferably consists of a comparatively stiff supporting part 16 and of a soft padding 17 supported thereon. The supporting part 16 may, for example, be made as a plastic injection molded element; it may, for example, have a flat shape, approximately parallel to the backrest 7; for its mechanical stabilization, it is preferably provided on its rear side 18 with stiffening ribs 19 and/or with stiffening ribs 19, 20 crossing each other. Its front 21 could also be provided with ribs, but this could affect the seating comfort, so it is preferably omitted. In particular, the supporting part 16 should be a single-layer element, and not consist of several, separate or even spaced-apart parts or layers. Likewise, the invention prefers that the height extent of a load-bearing part 16 is greater than its thickness measured in the seat direction. If the upper and lower edges of a supporting part 16 are substantially parallel to each other, or spaced in an approximately uniform vertical distance, the distance between two such adjacent backrest segments 10 is also approximately constant.

To avoid injuries, the supporting parts 16 may be rounded at their corners, that is, where the lateral end faces meet the upper and/or lower edge of the relevant part 16, for example with a bending radius of 10 mm or more, preferably with a bending radius of 15 mm or more, in particular with a bending radius of 20 mm or more.

In addition to the mechanical stabilization, the optionally intersecting stiffening ribs 19, 20 have a second function, namely the fixation of the padding 17. The padding 17 may, for example, be made by a foam which is subsequently foamed around the supporting part 16 and thus fills the chambers or compartments 22 between the stiffening ribs 19, 20 and thereby connects intimately and thereby also largely immovable with the supporting part 16. Inter alia, the use of polyurethane foam or the like is conceivable.

By the padding 17, the individual backrest segments 10 receive their outer shape, which preferably corresponds approximately to a rectangular blank or the shape of a flat cuboid with rounded edges and/or corners, respectively.

Preferably, the supporting parts 16 of several or all backrest segments 10 are identical. In this case, by an identical padding 10, the respective backrest segments 10 each receive the same shapes, too; however, they can differ from each other by aesthetic design features such as in particular different colors. Thus, the identical backrest segments 10 can be interchanged, for example to alter the aesthetics, while the function and/or the mutual distances between adjacent backrest segments 10 remain constant and unchanged. This is particularly possible because the backrest segments 10 are displaceable along the profiles 8, so that they can be removed if necessary and, for example, cleaned and/or put back in a reversed order.

As can be seen from the drawing, these approximately rectangular or approximately cuboidal backrest segments 10 also have no ideal flat shape, i.e. with straight horizontal edges, but extend in the horizontal direction along a slightly curved course, for example similar to the gently arched bow of a uniformly curved hanger, where the ends 11 of the backrest segments 10 are slightly curved towards the front, i.e. towards the front edge 12 of the seat area 7. In particular, this results from a corresponding, preferably slightly angled course of the flat main body or corpus 23 of a supporting structural part 16.

The individual backrest segments 10 each encompass both profiles 8 and are aligned with their middle region in each case parallel to the local connecting line between the two profiles 8, that is to say the connecting line at the level of the relevant backrest segment 10. Thereby, they are aligned at least approximately parallel to each other, apart from mutual twisting, if the profiles 8 bend in opposite directions, so for example, once forward and once back. Therefore, it is possible to cover all the backrest segments 10 with a common coating of a cover fabric, so that, in the neutral position, it is barely recognizable that the backrest 7 is divided into segments. In particular, textile material made of natural and/or synthetic fibers comes into consideration therefor. This cover may, for example, be one having the shape of a pillowcase with one or more zippers, snaps or the like at its bottom and/or along its peripheral edge. When opened, the cover can be removed, for example for washing. On the other hand, it is also possible to cover each backrest segment 10 with its own coating. In the latter case, the color of the cover could vary for different backrest segments 10, but could equally well be identical; this is just an aesthetic measure.

As already stated above, the supporting structural elements 16 of the individual backrest segments 10 surround the profiles 8 in each case completely, i.e. they are each provided with a plurality of apertures 13 corresponding to the number of profiles 8, which apertures penetrate each structural element 16 from the top 24 to the bottom 25 continuously.

Since there are preferably several profiles 8 next to each other, the apertures 13 also occur several times. Preferably, there is no aperture 13 on the vertical (central) axis of symmetry of a supporting element 16. Instead, the apertures 13 should be provided in pairs, wherein two apertures 13 are arranged in mirror image relative to one another with respect to the vertical axis of symmetry of the respective supporting element 16.

While the upper and lower edges of a supporting element 16 should preferably extend horizontally between the openings 13, they can each extend from the respective outermost apertures 13 to the outside upwardly.

As part of this positive connection, on the one hand, a guidance of the backrest segments 10 should take place; on the other hand, an adjustment of the height of the respective backrest segment 10 with respect to the profiles 8 is desirable. Furthermore, according to the invention, however, a relative ajustability between the backrest segments 10 or between those supporting structural elements 16 on the one hand and the profiles 8 on the other hand is advantageous so that, in each torsional state of the backrest 7, the individual backrest segments 10 can each optimally adapt to the back of a seated person.

To meet all those requirements, the invention provides that the apertures 13 of the supporting structural elements 16, which encompass the profiles 8, have a special shape, as can be seen in particular from Figures 6 to 8.

It can be seen that the recesses 13 are arranged in approximately tubular or sleeve-shaped lugs 26 on the back 18 of the planar corpus 23 of a structural element 16. These lugs 26 extend in the vertical direction, i.e. transversely to the longitudinal direction of the relevant structural element 16. Since, due to their tubular or tubular geometry, they have a high intrinsic stability on the one hand and on the other hand are able to further stiffen the flat body 23, they can be used as starting points for or as intersections with horizontal stiffening ribs 19.

By a comparison between Figures 6 and 7, from which the outer shape of the tubular or sleeve-shaped projections 26 results, with the Fig. 8, where especially the inner shape of the recesses 13 in the lugs 26 can be seen, it is noticeable that the outer shape of the projections 26 preferably follows the course of the inner wall of the recess 13, i.e., that the lugs 26 have an approximately constant wall thickness.

This shape - approximately the same inside and outside - is divided into an upper section 27 and a lower section 28. Both sections 27, 28 can be described as lateral surfaces of truncated cones, i.e. each have an end of reduced cross-section and an end with a cross-section enlarged in contrast.

The two conical sections 27, 28 are each juxtaposed with their cross-sectionally tapered ends and diverge therefrom with increasing distance from the junction point 29 in the radial direction.

As shown in Figures 6 to 8, the opening angles of both frusto-conical sections 27, 28 may be approximately the same size, and may for example be in a range between 1° and 20°, for example in a range from 2° to 15°, preferably in a range from 3° to 10° or from 4° to 8°.

In the region of the transition between the two frusto-conical sections 27, 28, these merge into each other without gradation on their inside, preferably also on their outer side.

The two frusto-conical sections 27, 28 meet approximately halfway up the structural element 16 and thereby reach approximately equal diameters in the region of the upper and lower sides 24, 25.

The meaning is that a tilting movement around the point 29 of the transition between the upper and lower truncated cone portion 27, 28 is equally possible in both directions, so once with a tilting forward, whereby the bottom 25 of the structural member 16 recedes to the rear, while the top 24, however, tilts forward, as well as a tilting backwards, that means in exactly the opposite direction of rotation. In the region of the transition 29 between the upper and lower truncated cone sections 27, 28, a structural element 16 and thus also the backrest segment 10 supported thereby altogether experience a guide in the seat direction as well as laterally thereto. To hold the individual backrest segments 10 in place in the vertical direction, it can further be provided that spacer bodies 30 are inserted between two vertically adjacent structural elements 16. These are indicated in Figures 3 to 5.

It can be seen from Fig. 5 that the spacer bodies 30 can be composed of at least two parts, at least one sleeve-shaped body 31 tightly enclosing the relevant profile 8, and a flange-like body 32 surrounding the same at least partially.

The sleeve-shaped bodies 31 lying in a common horizontal plane may be formed into a single part 33, which may for example have a slightly dumbbell-shaped form. This part 33 or the individual parts 31 are designed such that they can protrude at least partially into the intermediate space between a mouth of the recess 13 and the profile 8 received therein. Moreover, if these parts 31,33 are made of an elastic material, they can avoid or at least dampen an impact between the structural elements 16 and the profiles 8.

In contrast, it is up to the flange-like parts 32 to keep the structural elements 16 in the vertical direction at a distance. For this purpose, they can consist of a rather hard material such as metal or hard rubber. They protrude further outward than the sleeve-shaped or dumbbell-shaped parts 31,33 and therefore can not penetrate into the space between the profile 8 and the recess 13, but support the undersides of the tubular or sleeve-shaped projections 26 against each other.

Therefor, a frictional connection can be provided in the vertical direction or, respectively, in the longitudinal direction of the encompassed profiles 8 between the spacer bodies 30 and the profiles 8 encompassed by them, or even a locking engagement that engages in a form-fitting manner.

For this purpose, in one, both or all profiles 8, radial projections or preferably depressions may be provided, for example notches, bores or other apertures, where a spacer body 30 adjustable approximately radially to the respective profile longitudinal axis can be supported.

It may also be a latching mechanism with a spring, which are pressed radially inward towards the relevant profile longitudinal axis and can, if necessary, be lifted from a pervaded notch or other recess as needed by means of an element for manual actuation, for example to adjust the respective backrest segment 10 along the profiles 8.

The invention further provides that such a radially movable part on a spacer body 16 between two supporting parts 16 of adjacent backrest segments 10 is adjustable approximately within the plane of the respective backrest segment 10 or the body 23 of the supporting body 16, preferably approximately horizontally. In such an arrangement, such a locking mechanism does not appear conspicuous, but can be fully integrated within the respective backrest segment 10. The manual actuating element for lifting such a locking part could, for example, be designed as a finger-engaging ring arranged at the rear end thereof, which can be reached from the rear side of the relevant backrest segment 10 through an opening in the covering material and in the upholstery. In the case of a cover material that spans over the entire backrest, it is also sufficient if it is opened along a peripheral zipper and removed, if necessary, in order to gain access to the adjustment mechanism.

It is not shown in the drawing that additional devices can be provided on one or more backrest segments 10, for example armrests, lumbar cushions, headrests, with optional backrests and/or integrated loudspeakers, etc.

Reference List 26 extension 27 section 28 section 29 transition area 30 spacer element 31 sleeve-like part 32 flange-type part 33 dumbbell-shaped part 1 seating furniture 2 chair frame 3 vertical support 4 arm 5 castor 6 seat surface 7 backrest 8 profile 9 top edge 10 backrest segment 11 end 12 front edge 13 aperture 14 top 15 bottom 16 supporting part 17 upholstery 18 rear side 19 stiffening rib 20 stiffening rib 21 front side 22 compartment 23 two-dimensional part 24 top 25 bottom

Claims (15)

A seating furniture (1) having at least one seating surface (6) and at least one backrest (7), wherein two or four elongate profiles (8) are preferably attached to a base part within the area of the seating surface (6), preferably each with a circular exterior cross section, and which project, within the plane of the back glass (7), parallel to each other, but without any direct rigid connection with each other upwards approximately until the upper edge (9) of the back glass net (7), and thereby the back glass net (7) are divided into four backbone segments (10), each of which is in the form of a strip of horizontal wadding, and each has an inner, baseless, at least regionally flat structural member (16) for supporting a padded or attached padding ( 17) of a curved material, wherein an inner, at least regionally flat structural element (16) for each profile (8) has a through-cut ring (13), the inside of which encloses the pageant profile (8) completely or at least partly characterized by the fact that in between the outside of the cut-out ring (13) in the structural element (16) and the profile enclosed therein is provided with an angled connection which not only allows a rotation of the pivotal backrest segment (10) about the profile axle of the profile (8), but at least also allows a tilting of the pivotal backlash segment (10) about a perpendicular to the longitudinal axis of the surrounding profile (8), preferably about a direction following a connecting line between the two profiles (8). Seating furniture (1) according to claim 1, characterized in that the direction extending perpendicular to the profile of a profile (8) and around which an inner structural element is pivotally swiveled by the profiles (8) is itself pivotable about the profile (8). at least within a surface pierced by the pageant profile (8), so that in the case of torsional movements of a seated person around its back column, the backrest segment (10) provided by the inner structural member (16) on the profiles (8), self-adjust with respect to the rear-facing back section and adhere optimally to this. Seating furniture (1) according to claim 1 or 2, characterized in that the contact area between the inside of the projection ring (13) in the structural element (16) and the profile (8) enclosed therewith is formed annularly closed or at least spaced or annular or arcuate in all circumstances over a lash that is parallel to the shaft axis of the enclosed profile (8) and which is less than the length of the shutter ring (13), preferably less than the outer circumference of the profile (8). smaller than the diameter of the profile (8). Seating furniture (1) according to one of claims 1 to 3, characterized in that an inner structural element (16) has a cutout ring for full-scale or at least partially enclosing each of its profile (8) and the inner cross-section of at least one at a location (29) between its mouth at the top and bottom is less than within the area of an mouth. Seated furniture (1) according to one of the preceding claims, characterized in that the course of the inside of a cutout ring (13) in an inner structural element (16) for complete or at least partially enclosing a profile (8) ) along its weld direction has a location (29) where its internal cross-section is minimal. Seated furniture (1) according to claim 5, characterized in that at least one continuous cut-out (13) in place (29) with minimal internal cross-section is equal to or less than the cross-section of a profile (8) passing through the inner structural element (16), so that the latter is enclosed by friction-fixing by the bearing structural element (16), that is, in such a way that a friction-increasing normal force is produced between the profile (8) and the inside of the cutout ring (13). Seating furniture (1) according to one of the preceding claims, characterized in that the location (29) of a tilting axle or a narrow or minimal internal cross-section of a cutout ring (13) in an inner structural element (16) is closer to the structure structure ( 16) average height level than the upper and lower side (24, 25) of the structure structure element (16). Seated furniture (1) according to one of the preceding claims, characterized in that a cutout ring (13) in an inner structural element (16) extends continuously from the location (29) of a tilting axis or a narrow or minimal internal cross-section up to the upper and / or lower mouth, e.g. along a cone or cone surface or along each a cone or cone surface. Seated furniture (1) according to one of the preceding claims, characterized in that a cutout ring (13) in an inner structural element (16) extends continuously from the location (29) of a tilt axis or a narrow or minimal internal cross-section to a an orifice on an upper side and up to an orifice on the underside of the cutout along each of a cone or cone surface, preferably the apertures of the two cone or cone faces (27,28) pointing in different directions with respect to the casing axis of an enclosed profile (8) . Seated furniture (1) according to one of the preceding claims, characterized in that at least one opening angle of a cone or cone surface (27, 28) is equal to or greater than 1 °, preferably equal to or greater than 2 °, freezing with or greater than 4 °, and / or that a cone or cone surface (27, 28) at least one aperture angle is equal to or less than 15 °, preferably equal to or less than 10 °, ice equal to or less than 7 ° . Seating unit (1) according to one of the preceding claims, characterized in that the aperture angle of the two cone or cone surfaces (27, 28) is equal. Seating furniture (1) according to one of the preceding claims, characterized by at least one spacer element (30) between two adjacent backrest segments (10) and / or their internal structural elements (16), e.g. having an apron or sleeve (31) projecting into a cutout ring (13) in an inner structural element (16), which is preferably at least partially resiliently deformable between at least two adjacent backbone segments (10). Seating furniture (1) according to claim 12, characterized in that two aprons or sleeves (31) are connected to each other via a spacer, preferably to a disc-shaped part (33) with two mutually parallel cut-outs for passage of each profile (8). ). Seated furniture (1) according to one of claims 12 or 13, characterized in that a spacer element (30) between at least adjacent backrest segments (10) has at least one flange (32) or extension extending up to the mouth edge of the a cutout ring (13) in an inner structural member (16), which is preferably not resiliently deformable between at least two adjacent backrest segments (10) and / or for the passage of a profile (8) having an annular geometry or a arcuate geometry with two mutually flushing cut-outs. Seated furniture (1) according to one of the preceding claims, characterized in that at least one profile (8) - which is in the form of a rudder or a rudder of metal, and / or - follows a crush-free course, is a straight stretched course. or within a vertical plane in the sash direction provides curvature similar to the curvature of a back sail, and / or - within the region of its underside has a folded section or a radially projecting tab or a flat groove which is approximately tangentially up to , which is closest to the load direction of the profile (8) and extends beneath the side surface (6) to the frame of the seat furniture (1) and is attached thereto preferably without penetrating through the seating surface.