EP2081468B1 - Ergonomical seat - Google Patents

Description

The invention relates to a seat with a central region and an adjoining outward adjoining edge region.

Long sitting at a desk or on a computer on traditional chairs or armchairs has proven particularly damaging to the back. Ordinary seating structures enforce a man despite the now common adjustment options of the seat height and the backrest inclination a posture, which has a negative effect, especially on the intervertebral discs by a one-sided partial pressure in humans. For many years of pain-free functioning of the spine, the intervertebral joints, the cartilage and ligamentous apparatus as well as the musculature must be in a physiological equilibrium and sufficiently moved in addition to the intervertebral discs. In conventional sitting, the ischial tuberosities (tuber ischiadicum) usually pressed by a too soft seat in a hollow inward and pushed apart the pelvic blades as biomechanical countermovement, creating a slight kyphosis in the lumbar spine. This undesirable effect is called an "outflair". Biomechanically better, the ischial tuberosities should be pushed outward from the surface of the seat to expose the intervertebral discs and prevent kyphosis, thus moving the pelvic blades inwards, thereby maintaining the physiologically correct lordosis position of the spine. This is called "inflair".

Another disadvantage of conventional seats and armchairs is that the front, often upwardly curved edge of the seat presses against the underside of the thighs and greatly hinders both the return of venous blood from the legs and considerably restricts the freedom of movement of the pelvis. In the long term, this leads to congestion of the blood in the legs and vein problems, both in the legs, as well as in the lower pelvis (hemorrhoids).

From the US 2002/0036420 A1 For example, a seat body is known which has an increased number of transversely extending slots in the front seating area such that this forward area has greater flexibility than the remaining areas of the seat. The rigidity is increased by transverse to the seating direction arranged reinforcing ribs. At the same time each extending in the seat direction stabilizing elements are provided on the lateral edges of the seat plate, which consist of successively arranged in series blocks. Below the blocks, a support surface is formed, on which the blocks come to rest on bending down the seat. The blocks have a wedge-shaped gap towards the respective neighboring block, which closes when bending the free end of the seat plate down. However, this design does not produce the required softness while maintaining sufficient stability.

The invention is therefore based on the object to provide a seat construction which avoids the physiologically adverse effects of conventional seats.

The object is achieved by a seat with the features of claim 1.

The seat according to the invention with a central region and an adjoining edge region to the outside is characterized by a suspension, which has an increasing from the central region to the edge region towards yielding. As a result, an improved seat is provided which avoids the above-mentioned disadvantages of conventional seats or chairs. Advantageously, the seat has a suspension that provides a stronger central area relative to the edge region and thus prevents inward compression of the ischial tuberosities and impairment of the blood supply to the legs.

Radially arranged spring arms extend from the fixed central region of the spring in the direction of the edge region, of which at least the forwardly pointing spring arms are formed increasingly softer radially outward. In this way, a stronger against the surrounding portions of the seat central area is made possible. Due to the softer design of the spring arms, the seat can give way, whereby any unfavorable pressure against the underside of the thighs is avoided. The front edge of the seat adapts to the body shape and the movement of the underside of the thighs. In a favorable embodiment, the spring arms are formed as an array of leaf springs, wherein the inwardly directed spring arms may be formed longer and wider than, for example, the laterally arranged. In order to achieve the increasing compliance to the edge region, preferably a plurality of leaf springs of different lengths can be arranged one above the other and thereby become shorter from top to bottom.

Also, the thickness of the individual spring arms can be designed individually and independently. The shape of the spring arms is also variable in any Welse, as long as the technical function is maintained.

In an alternative embodiment, the suspension may be formed of a combination of elastomeric foam material of different nature. It is also possible that the foam material is supported by a spiral spring arrangement.

It is also favorable that the seat has at least one foam layer made of a translucent material, wherein light may shine through the foam in the region of thinner layers, the foam is not made transparent in the region of thicker layers. This conveys to the viewer that it is a seat with a compliant edge area. In addition, the foam layer improves the seating comfort.

Furthermore, it is advantageous that a comfort zone made of soft integral foam arranged in the edge region, or the seat may be completely foamed by soft integral foam substantially. The surface of the soft integral foam is preferably flocked by flocking. The comfort zone gives the occupant a pleasant sitting feeling in the edge area, so that the seat is indeed felt, but at no point uncomfortably presses against the thighs.

In an alternative embodiment, the suspension is designed as a plate spring with radially outwardly decreasing spring force, whereby the advantages described above can also be achieved. For example, the disc springs may also be slotted.

It is also advantageous that below the suspension a stabilizing element, in a preferred embodiment, can be arranged as a rib arrangement with properties becoming stiffer as the bending increases. It is favorable that the rib arrangement can have at least one web, which is provided on the underside with several cuts. The incisions may be formed in various shapes and with different opening widths, with an inverted V-shaped configuration being preferred. Also, the opening width of the incisions may be made variable to the edge region, in order to adjust and limit the yielding movement in this way.

In an alternative embodiment, the rib arrangement may also consist of a kind of dovetail engagement, the engagement becoming deeper as the deflection increases, until the corresponding mating surfaces abut one another and further deflection is prevented. A dovetail design of the rib members in both vertical and horizontal orientations causes central engagement of the rib sections and prevents unwanted lateral deflections of the spring arms.

In yet another embodiment, the stabilization is effected by a limiting element in the form of a loose band, which is arranged laterally between the spring arms or under the diaphragm spring. The deflection of the individual spring arms relative to the adjacent spring arms is only possible insofar as the lots are used up. In this way, a favorable interaction between the each adjacent spring arms and thus achieved a uniformity in the movement.

It is also advantageous that the seat has a convexly curved seat support, which may be harder in the middle and softer towards the edge. This supports the more stable formation of the central area in relation to the edge area.

All of the above-described features are directed to the seat having a fixed central area and a compliant edge area, wherein the compliance is limited and overall a comfortable, back-friendly seating feeling is created.

Furthermore, it is advantageous that the seat is arranged in a seating furniture construction, which has a base, preferably designed as a pillar or gas spring, and a foot part, wherein preferably the foot part has a joint which a pendulum movement of the seated person together with the seat and allows the undercarriage. The arrangement of the joint is also possible on different areas of the undercarriage. The higher the pivot point of the joint and thus located closer to the buttocks of the seated, the less favorable the lumbar spine is loaded. Therefore, in the preferred embodiment, the hinge is disposed on the foot part. With the base and seat tilting, the occupant needs to use at least one support leg to maintain balance. In this way, the lumbar spine stays straight in line with the base.

It is also advantageous that in an alternative embodiment, a seat plate for receiving the seat can be arranged on the base frame. In particular, the seat plate may be formed with a receptacle for mounting on a component belonging to the substructure, in particular a gas spring. The spring arms can be injected in this embodiment, for example, in the foam and do not necessarily have to be in contact with the seat plate.

With the help of a designed as a gas spring base, the seat is individually adjustable in height. In a particular embodiment of the height adjustment, for example in a particularly long gas spring, the use is advantageously also possible as a standing seat.

In a further embodiment, the subframe is designed as a telescopic column, which can be equipped with a lock. As a result, the height is also adaptable to different sized people. Also, the column may comprise a spring, whereby the seat is resiliently received on the column. This can be advantageous, since in this way vertical rocking movements of the seated person are also made possible and the vertebral column is vertically loaded differently and consequently the surrounding muscles are trained. The spring on the base can also be used in all other versions, as far as this is technically possible.

It is also favorable that the base frame can be arranged on the foot part in a storage and with respect to a vertical axis in all directions can be tilted. In every possible tilt position, the column can be locked. In the preferred embodiment, the inclination is at least as far feasible that at any height of the seat, i. each possible length adjustment of the column, between the foremost point of the seat and the foremost point of the foot part, a vertical line is adjustable. This is for a sitting independent of the seat in equilibrium sitting, without falling forward, backward or in a lateral direction, advantageous.

Advantageously, the joint may be formed in the foot as a pendulum joint with at least one rubber element to limit the pendulum width of the column and the seat. Furthermore, it is advantageous that the rubber element can be biased by a mechanism, the mechanism offers different adjustment options of the bias. In this way, the different preferences with respect to the pendulum range or ease of commuting of the seated be taken into account. Also in this way the supporting force is influenced by the foot of the person sitting, i. with a large bias of the rubber element only a small or no support force is necessary.

Further, the foot part may comprise means for determining the inclination of the column and means for adjusting the bias, wherein the means are preferably formed by a self-adjusting screw with a handwheel. In this way, the occupant can advantageously make adjustments in a simple manner in accordance with his or her individual preferred and ergonomically correct setting with regard to the height, inclination and possible pendulum width of the seat.

It may also be possible that the structure under the translucent foam layer made of non-translucent, especially dark material. (A7)

Furthermore, it may be advantageous for the rib arrangement to have at least one web which has downwardly directed recesses. (A14)

Fig. 1

einen mittigen Querschnitt der Sitzkonstruktion in der Seitenansicht;

Fig. 2

eine Detailansicht 1 der oberen Hälfte des Sitzes im mittigen Querschnitt in der Seitenansicht;

Fig. 3

einen mittigen Querschnitt des Sitzes in der Vorderansicht;

Fig. 4

eine Explosionsdarstellung der unteren Hälfte der Sitzkonstruktion;

Fig. 5

eine Explosionsdarstellung des Sitzträgers und der Federung;

Fig. 6

eine Ansicht des Sitzes von unten;

Fig. 7

eine Seitenansicht der Federung im mittigen Querschnitt;Fig. 7a eine weitere Ausführung des Stabilisierungselements mit Federung in der Seitenansicht;

Fig. 7b

einen Querschnitt eines Federarms und Stabilisierungselements mit einem Schnitt A-A durch das Stabilisierungselement;

Fig. 7c

eine weitere Ausführung des Stabilisierungselements mit Federung in der Seitenansicht;

Fig. 8

eine perspektivische Darstellung der Federung in einer weiteren Ausführung von schräg unten;

Fig. 9

den unteren Bereich des Untergestells mit dem Fußteil in einer Seitenansicht im mittigen Querschnitt;

Fig. 10

eine Lagerung des Fußteils als Querschnitt in der Seitenansicht;

Fig. 11

eine Explosionsdarstellung des Untergestells und Fußteils;

Fig. 12

eine weitere Ausführungsform des Sitzes als mittiger Querschnitt in der Seitenansicht;

Fig. 13

eine weitere Ausführungsform der Sitzkonstruktion in einer Explosionsdarstellung von schräg unten;

Fig. 14

eine Ausführungsform von mehreren Sitzen auf einer Fußleiste in der Vorderansicht.

Preferably, the seat may have a convexly curved seat surface, which is harder in the middle and softer towards the edge. (A19) Further advantages of the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to the figures. Show it:

Fig. 1

a central cross section of the seat construction in side view;

Fig. 2

a detail view 1 of the upper half of the seat in the central cross section in the side view;

Fig. 3

a central cross-section of the seat in front view;

Fig. 4

an exploded view of the lower half of the seat structure;

Fig. 5

an exploded view of the seat support and the suspension;

Fig. 6

a view of the seat from below;

Fig. 7

a side view of the suspension in the central cross section; Fig. 7a a further embodiment of the stabilizing element with suspension in the side view;

Fig. 7b

a cross section of a spring arm and stabilizing element with a section AA through the stabilizing element;

Fig. 7c

a further embodiment of the stabilizing element with suspension in the side view;

Fig. 8

a perspective view of the suspension in a further embodiment obliquely from below;

Fig. 9

the lower portion of the underframe with the foot part in a side view in the central cross section;

Fig. 10

a storage of the foot part as a cross section in the side view;

Fig. 11

an exploded view of the underframe and foot part;

Fig. 12

a further embodiment of the seat as a central cross section in the side view;

Fig. 13

a further embodiment of the seat structure in an exploded view obliquely from below;

Fig. 14

an embodiment of several seats on a baseboard in the front view.

The in the FIGS. 9 to 14 illustrated and explained in the description accordingly objects do not fall within the scope of the claims. The description is made solely for technical reasons.

In Fig. 1 is the central cross section of a side view of the seat 1 with the base 8 and the foot part 17 is shown. The Fig. 1 serves as an illustration, the individual features are described in more detail in the following figures, wherein the upper portion of the construction as a detail 1 in Fig. 2 and the lower area as detail 2 in Fig. 9 is described.

In Fig. 2 is the detail 1 of the Fig. 1 , the seat 1 according to the invention shown as a cross section in the side view. The seat 1 has a central area 4 in the center and an edge area 5 towards the front. In the central region 4, a receptacle 16 is arranged on the underside of the seat 1, within which the underframe 8, which is preferably designed as a gas spring, extends. The seat 1 is attached via the receptacle 16 to the base frame 8. The receptacle 16 is a part of the seat support 2, which constitutes the essential supporting unit of the seat 1. The seat support 2 forms a stable framework and extends in the rear area almost completely over the entire surface of the seat 1, in the front region only over a certain part, in about one third of the seat 1. On the seat support 2, the suspension 3 is arranged which is formed in this embodiment as a kind of plate. The suspension 3 covers substantially the entire surface of the seat support 2 and has a plurality of spring arms 6 which extend from the central region 4 over at least part of the edge region 5. At the edge 5, the spring arms 6 can yield with respect to the central region 4 in all directions. On the underside of the spring arms 6 stabilizing elements 7 are arranged, which limit the maximum deflection of the spring arms. The entire seat 1 is surrounded by a shell 15 made of foam except for the central sub-area, wherein the sheath 15 is formed in the upper seating area as a thicker upwardly curved seat cushion 32 and extends below the lower side than the thinner layer on the seat support 2. The seat support 2 is almost completely foamed in foam. On the front, the sheath 15 has a plurality of recesses 12 ', which will be described in more detail below. The foam is preferably translucent, so that in areas without underlying structure, for example, between the spring arms 6, light can shine through. Preferably, the foam is a soft integral foam whose surface is additionally, but not necessarily, flocked by means of the flocking technique known to those of ordinary skill in the art. In the lower central region 4, the seat 1 has a cap 14 that can be fastened to the seat carrier 2, wherein the undercarriage 8 is guided through an opening in the central region of the cap 14.

In Fig. 3 a central cross section of the seat 1 is shown in front view. In addition to the in Fig. 2 described features is in Fig. 3 especially the trigger mechanism for the height adjustment of the designed as a gas spring base 8 is shown. The release lever 93, which lies flat in a recess 12 of the shell 15, is in communication with the transmission element 11, which is in engagement with the centrally arranged release element 10. The triggering element 10 is designed as a kind of rocker, so that it can be tilted by the transmission element 11 with respect to a vertical plane and thus the downwardly inclined part presses against the upper edge of the undercarriage 8. Both the release lever 13 and the transmission elements 11 connected thereto are arranged two times laterally on the left and right. In the rear region of the seat support 2, a handle 9 is arranged, which serves on the one hand for lifting the seat, on the other hand as a rearward boundary for the occupant. The suspension 3 is arranged on the seat support 2, wherein within the seat support 2 elevations and depressions are provided, can engage in the corresponding counter-forms of the suspension 3. In addition, the suspension 3 is fixed to the seat support 2, preferably riveted, screwed or the like, or manufactured therewith as a part (not shown).

For the sake of clarity, is in Fig. 4 the underside construction of the seat 1 is shown in an exploded view.

In Fig. 5 is an exploded view of the seat support 2 and the suspension 3 shown obliquely from the front. The suspension 3 is formed substantially as a kind of plate which has a greater strength in the central region 4 with respect to the regions lying further out. Rearward, the suspension is slightly rounded and provided with a recess for the attachment of the handle 9 on the seat support 2. The outer edges are straight forward, the leading edge and all corners are rounded. The individual spring arms 6 extend from the central area 4 to beyond the seat support 2 to the front and each have a substantially rectangular shape in plan view, wherein the front edges are rounded. In the left and right outer region of the suspension 3, the obliquely outwardly extending spring arms 6 are cut along the straight outer edges. In this embodiment, the spring arms cover 6 in their length in about two-thirds of the edge region 5, but it is also longer and shorter variants and any other shapes possible. Between the spring arms 6 are substantially V-shaped intervals, the V spans in the direction of the outer edge region. The central region 4 of the suspension 3 has a substantially round shape, which corresponds to a corresponding counter-shape on the seat support 2. Also in this figure are the in Fig. 3 described fasteners as rivets indicated.

The seat support 2 has a rounded back shape, which are followed by straight forward side edges, which extend substantially to the horizontal center of the seat support 2. The substantially circular central region 4 vorwärtseltig the conclusion of the seat support 2, which also has a correspondingly rounded outer contour in this area, which extends curved to the ends of the forward side edges. Within the seat support 2, the central region 4 has a wall 33, from which both side and rear struts 34 extend to stiffen the seat support to the outer edge. The transmission elements 11 are accommodated within the walled central area 4 in such a way that they can transmit their movement to the triggering element 10 via a joint. The triggering element 10 is also articulated and has to the left and right sides in each case a wing over which the transmission element 11 transmits the movement.

In Fig. 6 the seat 1 is shown in a view from below. In the central region of the receptacle 16 is arranged for receiving the underframe, which of a cap 14 for completely closing the seat 1 to avoid storage surrounded by dust, etc. In the rear region of the handle 9 is integrally connected to the seat 1. On the underside extending tongue-shaped to the left and right side recesses 12 in the shell 15, in which integrally integrated the release lever 13 are arranged. On the underside, the release lever 13 with the transmission elements 11 in connection, wherein the pressing movement of the trigger lever 13 acts on the underside of the transmission element 11. In a manner rounded towards the front, the foam sheath 15 has on its underside several recesses 12 ', which extend essentially from the left to the right outer edge. The rounding of the closer to the central region 4 recesses 12 'is stronger than that of the front edge region. 5

In Fig. 7 is a side view of the suspension 3, which is formed substantially as a plate shown. In the central region 4, the suspension has 3 holes and depressions for adaptation and attachment to the seat support 2. To the front extend over at least part of the edge region 5, the spring arms 6. On the underside of each of the spring arms a stabilizing element 7 is arranged, which preferably consists of individual spaced by incisions ribs. When indicated by the arrow bending of the spring arms 6, the width of the incisions between the ribs is reduced until the opposite surfaces abut each other, so that a further deflection of the respective spring arm 6 is prevented. The stabilizing element 7 can be realized in various designs. So is in Fig. 7a Another possibility in which the stabilizing element 7 is a rib arrangement with individual rib elements with a kind of dovetail engagement, whose pointed front engages with increasing deflection of the spring arm 6 in the corresponding back surface of the oppositely disposed rib member.

FIG. 7b shows a lateral cross section of a spring arm 6 with stabilizing element 7 including a horizontal section AA through one of the V-shaped recesses of the stabilizing element 7. The recesses are dovetailed to each other, so that in a deflection of the spring arm 6, the stabilizing element 7 must engage and a lateral kinking or displacement of the spring arm 6 can be prevented.

In another, in Fig. 7c illustrated embodiment, the stabilizing element 7 is realized by leaf springs 35, which are arranged directly below the spring arm 6 are. The number and length of the leaf springs 35 is variable, so that the flexibility of the spring arms 6 is adjustable. Preferably, the leaf springs 35 are gradually formed longer, the closer they are to the spring arm 6.

In Fig. 8 the suspension 3 is shown in a further embodiment for a round seat in perspective obliquely from below. However, it is also possible to change the individual spring arms 6 with respect to their length and / or width and / or thickness, for example, in the front region of the seat from the round central region 4 at regular intervals circumferentially equal and equal width shorten. Under the individual spring arms 6 stabilizing elements 7 are arranged, which according to the in Fig. 6 described embodiment are realized. In addition, 6 loose bands 36 are arranged between the spring arms, which are preferably formed elastically, and prevent the individual spring arms 6 to perform high relative movements. Both relative movements in terms of height and lateral movements are taken into account. By the connection of the spring arms 6 by loose bands 36 creates a continuous deformation of the suspension 3 in the region of the spring arms 6. The loose bands 36 can also be used in all other versions, as far as technically possible. In the Fig. 8 illustrated embodiment corresponds with their essential characteristics of a disc suspension, so that is dispensed with a separate representation of a person skilled in the art diaphragm spring with yielding possibly slotted edge, but this is expressly mitbeansprucht.

In Fig. 9 the lower portion of the undercarriage 8 is shown with the foot part 17 in a side view in the central cross section. Trained as a pillar base 8 is inclined relative to a vertical plane by the angle α forward and pivotally received in a bearing 19 within the foot part 17. In the upper area, the foot part 17 has an opening 21, within which the undercarriage 8 can move in all directions. The construction for executing the tilting movement of the undercarriage 8 is arranged in a cavity within the foot part 17. The conical bearing 19, which in Fig. 10 In the bottom region is a substantially rectangular plate 24, arranged with a central recess 25 which is easily rotatably mounted on the foot part 17 via a rubber part. Also, the plate 24 may be mounted in a recess on the foot part 17, wherein within the recess a Rubber part ensures a mobility (not shown). Between the plate 24 and the bearing 19, a round rubber element 20 is arranged, wherein the rubber element projects at least partially into the recess 25 of the plate 24. Opposite the horizontal bottom plane, the plate 24 is inclined in the rear region upwards, wherein it is in the rear end region with the tilting device 37 in engagement. By the tilting device 37, the plate 24 and thus the base frame 8 is raised or lowered with the support 19 and the rubber element 20 in the rear region and thus set the inclination of the undercarriage 8. The rubber element 20 surrounds the bearing 19 on top and forms a stop 19 'to all directions, with which the inclination of the undercarriage 8 is limited. In the rear region, the foot part 17 has an elevated support region 18. On the underside several compensating elements 23 are arranged for a secure state of the foot part 17.

In FIG. 9 In addition to the embodiments described above, an optional biasing device 37 is shown in this embodiment as a kind of screwing. By the biasing device 37, the distance of the rear part of the plate 24 relative to the upper portion of the bearing 19 is changed, so that the intermediate rubber member 20 is displaceable under correspondingly greater or lesser or no bias. In this way, the pendulum width can be adjusted. With different adjustment of the various biasing devices 37, the pendulum width is also variably adjustable in the different directions.

In Fig. 10 the storage 19 of the foot part 17 is shown in a side view as a cross section. The bearing 19 is formed substantially as a kind of conical sleeve having an outwardly flared flange 40 in the upper region. The top 26 of the outwardly extending flange 40 is formed wave-shaped. Inside, the storage has a preferably injected sleeve 22, which is provided in the upper region with a paragraph. On the bottom 26 'of the outwardly extending flange 40 a plurality of spaced struts 38 are arranged, in which the rubber element 20 engage or can be squeezed into the cavities formed by the struts 38 under load.

In Fig. 11 is an exploded view of the undercarriage 8, the foot part 17 and arranged within the foot part 17 biasing device 37 with the plate 24 in an exploded view obliquely from below. The base 8 extends in the central area through the foot part 17 to the lower edge of the plate 24. For reasons the clarity is omitted on a representation of the storage 19 in this figure. In the rear region, the plate 24 has a recess 24 '. A T-piece 27 is disposed above the recess 24 'and is rotatably supported in the foot part 17. The web 27 'of the T-piece 27 extends through the recess 24'. From the bottom, a handwheel 28 equipped with an internal thread is fitted through the recess 24 '. The hand wheel 28 is substantially star-shaped with rounded edges and hollow inside. Within the handwheel 28, a spring element 29 and a locking part 30 is arranged, which are both connected by a screw 31 with the T-piece 27. The spring element 29 has a substantially the outer contour of the handwheel 28 modeled shape. By the screw 31, the handwheel 28 with the elements 29, 30 arranged therein is firmly connected to the T-piece 27. The downwardly directed web 27 'of the T-piece 27 has an external thread, so that the handwheel according to a screw mechanism along the web 27' by rotation is movable. The plate 24 is moved according to the movement of the handwheel 28 along the web 27 ', so that the inclination of the plate 24 is variable to the horizontal and thus the inclination of the undercarriage 8. By the spring element 29 and the locking member 30 are with respect to the rotation of the handwheel 28 predefined latching positions determined to allow an adjustment of the undercarriage 8 in predefined stages.

In FIG. 12 is a further embodiment of a seat 1 shown as a central cross section in the side view. The preferably designed as a gas pressure spring base 8 is attached to the substantially conical seat support 2. On the upper side, a seat plate 41 is fixed on the seat support 2, which extends from the front edge of the seat support 2 to the rear region of the seat cushion 32. By the seat plate 41, a substantially fixed central area 4 and rear area is formed. In the front edge region 5, forwardly extending spring arms 6 are arranged, which are freely injected within the foam sheath 15 and act as a spiral spring arrangement. The spring arms 6 can be arranged offset as shown above the seat plate 41 or within the shell 15 relative to the seat plate 41. On the underside, the spring arms 6 on stabilizing elements 7, wherein the stabilizing elements 7 may be formed in one of the embodiments described above. On the underside, the seat cushion 32 in the front region recesses 12 '. Depending on the desired flexibility of the edge region 5, the spring arms 6 extend longer or shorter within the edge region 5 in FIG Direction of the front end. Also, the spring arms 6 can be connected individually.

In Fig. 13 is another possible embodiment of a seat construction shown in an exploded view obliquely from below. In addition to the known features described above, the seat construction in the region of the formed as a telescopic column base 8, a spring 42 which is received both on the base frame 8 and the underside of the seat 1 with a spring retainer 43.

In FIG. 14 several seats 1 are arranged with their respective bases 8 on a baseboard 44 in a row. The above-described functions of the seat construction are also realized in this embodiment, but not explicitly shown.

It is expressly pointed out that all the different feature elements of the individual embodiments can be combined with one another as far as is technically possible and that there is no contradiction with the appended claims.

Function Description:

On the seat according to the invention with a fixed central area and forward flexible edge area you sit with the ischial tuberosities in the fixed central area and forms with the spine a line with the base. The resilient edge region of preferably soft integral foam bends down with the spring arms until the stabilizing elements limit the bending. If the sitter were sitting too far forward with the ischial tuberosities, he would slip over the edge area or would have to support himself much more with his feet. The front edge area thus forms a comfort zone, which is when sitting at the level of the thigh, but does not press against the underside of the thighs. The seat can be positioned by adjusting the inclination of the undercarriage so that the front edge of the seat can form a vertical line with the front edge of the foot part at any height adjustment of the undercarriage. In this way, one sits in equilibrium with slight support with the feet, whereby the physiological lordosis position of the spine is maintained. The underframe is mounted in the foot part such that the inclination is adjustable via an adjustment of the tilting device. Due to an articulated mounting by means of a rubber element and a predetermined pendulum width in all directions is also possible, which is limited by a stop in all directions. By sitting on a solid surface with a due to the inclination of the seat structure straight spine, with the help of the feet as a support, a seat construction is provided, which ensures a long-lasting painless functioning of the spine. LIST OF REFERENCE NUMBERS Seat 1 Conversion 33 Seat support 2 Struts 34 Suspension 3 Leaf springs 35 central area 4 Bands 36 Edge area 5 Tilting device 37 Spring arms 6 Flange 40 Stabilizing elements 7 Seat plate 41 Underframe 8 Spring 42 Handle 9 Spring retainer 43 Triggering element 10 Baseboard 44 Transmission elements 11 Biasing device 37 Recesses 12 ' Release lever 13 Cap 14 Case 15 Recording 16 Foot part 17 conical bearing 19 Rubber element 20 Opening 21 Sleeve 22 Plate 24 Recess 24 ' Recess 25 Top 26 Bottom 26 ' Tee 27 Footbridge 27 ' Handwheel 28 Spring element 29 Latching part 30 Screw 31 Seat cushion 32

Claims (9)

1. Seat (1) comprising
   a central area (4) and a boundary area (5) adjacent said central area, and having a suspension (3) having an increasing flexibility from said central area (4) towards said boundary area (5), characterized in that

   - said suspension (3) having radiant suspension arms (6) of which at least the suspension arms (6) directed to the front are designed to be softer in an radial outward direction, and

   - at least one stabilizing element (7) being disposed under the suspension (3) and defined by a rib arrangement which has an increasing stiffness when its deflection increases, wherein the rib arrangement has at least one land having downwardly directed recesses which are provided by V-shaped notches and the notches having a differing opening width.
2. Seat according to claim 1, characterized in that the suspension arms (6) consist of an arrangement of leaf springs (35) having differing lengths and/or widths and/or thicknesses.
3. Seat according to any of the preceding claims, characterized in that the suspension (3) consists of a combination of elastomeric foam material of differing consistency and/or elastomeric foam material having flexible spring arrangements.
4. Seat according to any of the preceding claims, characterized by a comfort zone made of flexible structural foam arranged in the boundary area (5).
5. Seat according to any of the preceding claims, characterized in that the suspension (3) is provided by a disc spring having a spring force which declines in a radial outer direction.
6. Seat according to any of the preceding claims, characterized in that the rib arrangement consists of rib elements having a dovetail engagement, the rib elements engaging deeper at an increasing deflection.
7. Seat according to claim 1, characterized in that the stabilizing element (7) consists of at least one restriction element provided as a loose ribbon (36) being disposed laterally between at least two spring arms (6) or below the disc spring, wherein looseness is depleted after a defined deflection.
8. Seat according to any of the preceding claims, characterized by a convexly curved seating being harder in the centre and softer towards the boundary.
9. Seat according to any of the preceding claims, characterized in that it has a rearward restriction (9) of the seating, preferably in form of a handle,

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