EP1123025A1

EP1123025A1 - Seat

Info

Publication number: EP1123025A1
Application number: EP99957916A
Authority: EP
Inventors: Gisela Schon
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-10-19
Filing date: 1999-10-19
Publication date: 2001-08-16
Anticipated expiration: 2019-10-19
Also published as: EP1457141A3; US7093900B1; EP1457141A2; ES2315591T3; EP1457141B1; DE19982107D2; EP1457141B9; AU1547900A; DE59909824D1; EP1123025B1; DE59914880D1; ES2228134T3; WO2000022964A1; DE19848074A1; ATE410098T1; ATE269651T1; DK1123025T3

Abstract

The seat incorporates devices which force at least one point of the seat surface (1) to move continuously and cyclically periodically in at least two movement directions, whereby the one period is greater, preferably twice as great, as the other period. The seat surface is movable around a variable rotary point (3). The seat surface in its angle of inclination is movable both in the seat direction and also laterally. Leg supports are movable with the seat surface and incorporate at least one lower leg support, preferably with a lateral support surface.

Description

Seat

The invention relates to a seat, in particular a seat with a stable foot and with a seat.

There are various attempts to design seats that promote an ergonomic sitting posture, in particular in connection with office chairs or seats for PC workstations. For example, there are rocking chair-like constructions, seats with knee supports and sitting balls. However, all of these seats lead to relatively cramped sitting postures, since on the one hand the moving seat surface has to be stabilized and on the other hand unusual body parts, such as shins, cruciate ligaments and toes, are stressed in an unusual way.

It is an object of the present invention to provide a seat that offers an alternative to this.

As a solution, the invention proposes on the one hand a seat with a seat surface that is forcibly moved continuously and cyclically. In contrast to all known seats, the body does not have to cramp in such a seat in order to hold the seat in position. The muscle work that is also desirable in the known seats in itself thereby ensuring that the body must follow the movement of the seat. Here, the human body has been used to following such a given movement from an early age, for example when being carried by the mother, hiking or riding. Such forced movements are known to have a relaxing effect and can also serve therapeutic purposes. The moving seat surface should not perform a vibration movement, but a pleasant, calm and even movement. Additional vibratory movements would be conceivable.

It goes without saying that the amplitude of this movement is adapted in such a way that it is possible to keep the upper body approximately still. Due to the continuous movement of the seat surface with an almost stationary upper body, a large number of muscles are strained while sitting without cramping. The advantages of a forcibly continuously and cyclically moving seat surface follow in particular if the seat or the seat surface are designed such that they promote, if not force, an upright sitting posture. Such seats are known per se, for example a seat borrowed from a saddle shape can also be used. In particular, the seat can be designed such that an upright sitting posture with a straight back and indicated hollow cross is adopted, in which the thigh is relieved of pressure.

Such an upright sitting posture can be ensured with a suitable choice of seat surface in that the seat surface is inclined at an angle is shifted. This shift can advantageously take place both in the seat direction and laterally. In particular, it is also possible for the seat surface to be easily rotated with respect to the horizontal. It can also be provided to shift the height of the seat.

Means can be provided which forcibly move at least one point of the seat surface periodically continuously and cyclically in at least two directions of movement, the one period being larger, preferably twice larger than the other period. In this way, a movement similar to a step movement can be simulated with relatively simple means, such as occurs, for example, when riding in a change or pass gear or when being carried. In particular, it is possible for the seat surface to be inclined accordingly in order to carry out such movements.

As a further solution, the invention proposes a seat with a, preferably stable, foot and with a seat which can be displaced in its angle of inclination about a pivot point. Such an arrangement makes it possible, independently of the other features of the seat, to ensure, on the one hand, a movement which relieves the body while sitting and, on the other hand, an ergonomically favorable posture with regard to a workplace or a work surface. The fixed foot ensures that a central position, for example in front of a screen and a keyboard, cannot be left and that a slight movement of the body - whether performed or forced - is still carried out. In particular, it is also possible to shift the pivot point, preferably at a distance from the seat surface and / or at a distance from the foot. In this way, on the one hand the change in the angle of inclination and on the other hand the seat surface height can be influenced. The movement can also be designed such that a pivot point cannot be defined and only the inclination of the seat surface can be changed accordingly.

In particular, it is also possible to shift the pivot depending on the shift of the seat, so that the movement sequence for the seat can be chosen relatively freely.

Regardless of whether the change in the angle of inclination of the seat surface is free or forced, the seat surface can be spring-loaded. This can be done, for example, by means of a spring element which is effective between a seat support and the foot. It is also possible to provide a suitable resilient guide for the seat surface. Such a suspension avoids jerky movements which, on the one hand, disturb a smooth movement and lead to cramping and, on the other hand, have the consequence that the compensating movement caused by the seat, which occurs in the subconscious, is suddenly and undesirably conscious and thus becomes one Distraction from a concentrated activity.

It goes without saying that the seat surface does not necessarily have to be displaceable about a physically existing pivot point. Rather, one can Appropriate guidance of the seat can be provided, which shifts it around a virtual pivot point. Such a guide can be provided, for example, directly under the seat surface itself, so that the entire foot below the seat surface can be designed in a known manner as a normal seat foot, optionally also with rollers or the like.

In particular, the latter arrangement can also be designed as a footstool or as a standing surface instead of a seating surface, which is forced to move continuously and cyclically when standing directly on the floor. Of course, all of the movement sequences described above can be realized for this footstool or standing surface, and there are similar advantages. The seat according to the invention is particularly suitable for office chairs. In such an application, a stable foot in a particularly suitable manner enables a person to remain in the correct position in relation to a work surface or to a computer in the prescribed position. In particular, the invention can also be implemented in motor vehicles or in car seats. Here it can successfully prevent fatigue, especially on long journeys. By switching off the movement in emergency situations, a hazard potential can be reduced. Likewise, a seat according to the invention can be used in train driver's cabs or in aircraft and show the same advantages. In addition, it is possible to use a seat according to the invention as a lying aid if it is designed to be correspondingly flat or integrated into a bed. In such an application, a seat according to the invention can be a pressure ulcer counteract. A seat according to the invention can also be provided in the form of an armchair.

As already described above, the seat surface or also the footstool or the standing surface can be moved back and forth, up and down or also laterally. In particular, however, wobbling gyroscopic movements (such as in a hula or belly dance) or tumbling high-low gyroscopic movements (such as in a roller coaster) are also possible. In addition, the seat can also perform a U-shaped, side-alternating up-down movement, such as with a horse in the crotch, or a rocking movement, such as with a dromedary in the pass. A movement similar to a dolphin jump is also possible, in which the seat is moved forward and then straight back via an arch. It goes without saying that other movements are also conceivable, which can be selected in particular on the basis of the well-being of the user or else on the basis of medical considerations.

To ensure the desired movements, all known drives, guides and gears can be used. For example, a desired movement can be generated by a link pin guided in a groove. However, it is also possible to drive the seat surface by means of a corresponding gear linkage. In particular, an angle lever arrangement can be provided, by means of which - depending on the precise design and arrangement of the angle lever - a wide variety of movement forms can be implemented. Such an angle lever arrangement is relatively simple and excessive use of bearings or bearings can be dispensed with. Camshafts, eccentrics or suitable, rotating guideways can also be used to influence the motion sequence. A suitable combination of transmission links or several transmissions or the like can also be used to switch between different movement patterns.

The seat surface is preferably inclined or designed such that a person in the normal sitting position has an angle of over 90 ° between the upper body and the thigh. This applies preferably to all operating inclinations of the seat and ensures simple upright sitting. For this purpose, the seat surface can also be designed to be slightly inclined towards the floor.

Leg supports which can be displaced with the seat surface can be provided on the seat. In particular, these leg supports can have at least one lower leg support, ie a device supporting a lower leg. Such a lower leg support preferably has a laterally supporting support surface. Such a laterally supporting support surface promotes an ergonomically advantageous posture and likewise enables a stable seat on the moving seat surface. A corresponding footrest can be connected to the lower leg support. Depending on your wishes, these leg supports can be arranged in such a way that they enable a type of women's seat or a type of man's seat. A crossed leg position or a light cross-legged position are also conceivable.

It goes without saying that leg supports of this type can also advantageously serve a stable seat and thus an ergonomically advantageous sitting posture, independently of the other features of the seat.

In addition, the seat can comprise a backrest, the support surface of which can be displaced at least along a concave movement path independently of the seat surface. Here, the term “concave movement path” denotes a movement path that is designed to run around a body that is supported on the backrest.

Such a backrest which can be displaced independently of the seat, the degree of freedom of which is preferably directed essentially perpendicularly to a vertical plane, makes it possible, on the one hand, when the seat is at rest, that the back area of a seated person can be comfortably moved within a certain range. When the seat surface is moving, on the other hand, the back and thus the upper body can easily follow the movement of the seat surface a little without causing tension in the lower vertebra area.

Such a backrest, which can be displaced along a concave movement path, is also advantageous independently of the other features of the seat. In particular, it is also possible to use this inventive Basic idea to use as a backrest or for a headrest or for a pillow. Here the guideway or guiding elements are supported or arranged accordingly horizontally, for example on a bed or in a couch. Here, too, there is the advantage that the head or upper body can be comfortably moved or rotated without having to be lifted. In particular, such a construction can also be used as a pillow in a bed or on a couch, in which case the concave movement path is oriented around the head. The headrest or pillow can also include a shoulder or backrest.

The backrest can also be subject to a forced movement or be drivable. In addition, the backrest can be designed to be steplessly adjustable, in particular in terms of its inclination. This applies in particular in connection with the use of such a backrest for couches or beds.

The seat can have armrests which are arranged to be resilient and displaceable at least in the horizontal direction independently of the seat surface or backrest. The suspension can be provided both horizontally and vertically. Due to the horizontal relocation, a large radius is supported. The suspension serves on the one hand a pleasant support and on the other hand a return to an initial position. Such armrests are also advantageous regardless of the other features of the seat. The seat can be provided with heating and / or ventilation. Of course, this also applies to a backrest or the other assemblies of a seat arrangement, such as headrest, armrests, footrests or the like.

A sensor can be provided on the seat to control the own movement of a seated person. This can be, for example, a force transducer or a dynamometer. It is also possible to only check the energy consumption of the seat drive. A sensor of this type for checking the own movement of a seated person can be used to check whether the seated person is “sitting positively” or whether he is only lazily following the movement of the seat. It is desirable that the seated person sits positively and, however, unconsciously follows the specified movement of the seat on his own initiative. It can be assumed that the forces exerted by the seat to carry out the movement are correspondingly greater in the case of a sluggish sitting. The energy consumption of the drive will increase accordingly.

The seat can also have means for changing the frequency and / or amplitude of the movement, so that the movement of the seat can be adapted to the type of sitting. In the case of positive sitting, for example, the frequency and / or amplitude of the movement can be reduced to a minimum. On the other hand, if the seated person begins to sit "sluggishly", the amplitude and / or the frequency can be changed accordingly in order to stimulate positive sitting. In addition, a signal such as a Horn signal or music sound. Such an arrangement makes it possible, in particular in aircraft or car seats or in train cabs of trains, to reduce the risk of falling asleep, since in the event of falling asleep a transition from positive seats to sluggish seats occurs.

Such a seat is also suitable for therapeutic purposes. In particular, a drive with individual linear actuators, which are arranged offset from one another, can be provided. The offset arrangement can take place, for example, in the manner known in flight simulators. Actuators or pneumatic or hydraulic drives are particularly suitable as drives. Here, the seat can particularly be used for the remobilization of people after operations of the lower extremities, the strengthening of the back and pelvic muscles and a variable, flexible and therefore not one-sided load on the intervertebral discs and digestive support for gan / and partially paralyzed people or the therapy of autistic or serve hyperactive people.

Further advantages, goals and properties of the present invention are explained with reference to the following description of the attached drawing, in which several embodiments of a seat according to the invention are shown by way of example. The drawing shows:

1 shows a first chair with a seat according to the invention in a schematic sectional view, 2 shows a second chair with a seat according to the invention in a schematic side view,

3 the chair according to FIG. 2 in rear view,

Fig. 4 shows the movement mechanism of the backrest of the chair according to Figures 2 and 3 and. a headrest in schematic

Presentation,

5 shows a third chair with a seat according to the invention in a schematic sectional illustration,

6 shows a fourth chair with a seat according to the invention in a schematic sectional illustration,

7 shows the chair according to FIG. 6 in a schematic horizontal section,

8 shows a fifth chair with a seat according to the invention in a schematic cross section,

9 shows the chair according to FIG. 8 in a schematic longitudinal section,

10 shows a sixth chair similar to FIGS. 6 and 7 with footrest in a schematic front view, 11 the chair according to FIG. 10 with the footrest folded out in a side view,

FIG. 12 different sitting positions on the chair according to FIGS. 10 and 11,

13 shows a seventh chair similar to that according to FIGS. 6 and 7 with a backrest and armrests in a front view, the armrests being in a writing position,

FIG. 14 the chair according to FIG. 13 in a side view,

15 the chair according to FIGS. 13 and 14 in a similar representation as Fig. 13, with the armrests and a backrest in one

Are rest position and

Figure 16 shows the chair of Fig. 15 in a side view.

In the chair shown in FIG. 1, a seat surface 1 can be displaced in its inclination angle about a pivot point 3 provided between a stable chair foot 2 and the seat surface 1. This is ensured in that a holding rod 4, on which the seat surface 1 is rigidly fastened, is supported on the foot 2 by means of a support disk 5. Here, the support disc 5 is movably supported on the foot 2, so that the seat surface can be displaced in a suitable manner, both in the seat direction and laterally. The support disk 5 is mounted on the foot 2 by means of two elastic rings 6 'and 6 ", the support disk 5 being supported on the lower elastic ring 6' and being held from above via the second elastic ring 6". As can be seen immediately, this arrangement is sufficient to create a seat 1 which can be moved in accordance with the invention and which has an upright rest position.

The support rod 4 also has a height adjustment 7 and an inclination adjustment 8, so that the seat can be adapted to individual needs.

As can be seen from FIG. 1, the holding rod 4 could also be rigidly connected to the foot 2 if a corresponding movement mechanism is provided directly under the seat surface 1, which enables a displacement around the then virtual pivot point 3.

In the embodiment shown in FIG. 1, a counter plate 9 is provided on the end of the hall rod 4 opposite the seat surface 1. Due to its inert mass, this counter plate 9 serves as a damping element, so that the movement of the seat surface 1 cannot take place too smoothly. In addition, 9 spring elements 10 are provided on the counter plate, which serve on the one hand to limit vibration in support of the elastic rings 6 'and 6 "and on the other hand prevent the seat 1 from rotating about the support rod 4. While the assemblies described so far ensure that the seat 1 can be freely displaced about the pivot point 3, the embodiment shown in FIG. 1 further comprises a drive 11 which is operatively connected to the counterplate 9 via an eccentric gear. Here, the gear is selected such that the seat surface executes a U-shaped, side-alternating movement.

As can be seen immediately, it is also possible to support the holding rod 4 at the bottom of the foot 2 and to mount it movably in the support disk 5. By profiling the bottom of the foot 2, a U-shaped, side-alternating up and down movement can then be achieved, as with a horse in the crotch.

The seat 1 is chosen such that it forces an upright posture with a straight back and indicated hollow cross, with the thighs being relieved of pressure. This upright posture and the passive following of the active compulsory movement or a corresponding compensatory movement give the seated person a feeling of security, without being sleepy, counteract muscle spasms and promote blood circulation in the entire body and digestion. The well cushioned movement causes a soft and gentle, changing load on the intervertebral discs. Here, the amplitude of the movement is chosen such that the head, shoulders and upper body can easily be kept still. A U-shaped, side-alternating movement is particularly advantageous in connection with a rigid backrest, since with such a movement the buttocks are removed from the backrest with each side alternation, so that a movement of the buttocks performed here and the corresponding subsequent movement of the back are one Friction on a backrest is reduced and thus does not lead to tension or tension with the backrest. This is particularly important when used with car seats, flight / new seats or train driver's cabs.

The chair shown in Figures 2 and 3 corresponds essentially to that shown in Figure 1. In the former, however, two lower leg supports 12 are provided on the seat 1, which are fastened to the seat 1 by means of brackets 12 ′. The lower leg supports 12 have, on the one hand, supporting, outward-facing support surfaces which enable a seat similar to a rider's seat. In addition, the supports 12 each also include a footrest so that the entire lower body can follow the moving seat 1, while in the embodiment shown in Figure 1 the feet rest on the floor.

By means of the brackets 12 ', the supports 12 can also be adjusted in such a way that a seat similar to an equestrian lady seat or a light tailor seat is possible.

In addition, the chair according to Figures 2 and 3 has a backrest, the support surface 13 independently of the seat 1 along a concave trajectory is shiftable. For this purpose, the backrest is fixed in place with respect to the chair foot 2 by means of a foot 14 and the support surface 13 can be displaced with respect to the foot 14 via a guide 15. As can be seen in particular from FIG. 4, the guide 15 comprises a concavely curved guide rail 17, along which a carriage 16 runs with the support surfaces 13. As can also be seen from this figure, the term concave movement path refers to the support surface 13 or to a body resting on this support surface. A construction shown in FIG. 4 can also be used as a shoulder, neck or headrest or as a pillow. In particular, a combination of head, neck, shoulder and / or back support is also conceivable. Here, the shape of the support surface is adapted to the head movement or a body movement and the guide rail is suitably supported.

For example, the support surface in the copying area can be made much thicker on the sides, so that when the body is turned, the head is supported in a comfortable position with respect to the shoulder which then lies below.

The support surface 13 of the backrest is also resiliently displaceable along a diagonal guide 15 ', so that the

Backrest or the support surface 13 can follow the movement of the seat surface.

In addition, the chair according to Figures 2 and 3 has a support arm 18, on the one hand lighting fixtures 19 and on the other hand Forearm supports 20 are attached. The lighting fixtures are aligned in such a way that a person sitting on this chair at a computer workstation (shown in dashed lines) is not dazzled.

The armrests 20 are designed as angled half-shells and are resiliently attached to the support arm 18 by means of suspensions 21. In this case, the suspensions 21 are attached to the support arm 18 further apart than the shoulder width. In this way, the supports 20 do not interfere when they are not in use. The supports 20 are also resiliently suspended, with a pressure- or speed-dependent locking device being provided, so that the armrest 20 can be used as a support when standing up when it is loaded suddenly.

As can be seen from FIG. 2, the person can lie down on the support surface 13 of the backrest in a rest position, in this case the seat surface can also be brought into a rest position. In particular, it is possible to leave the arms in the forearm supports 20 in this rest position, so that they remain in a relaxed position while the person is resting. By remaining in the forearm support it is ensured that an even blood flow to the body is maintained, in particular that not too much blood sags into the arms.

It goes without saying that such resilient armrests can also be resiliently positioned from below or from behind or in front and are also advantageous independently of the other features of the seat or chair. Here, the long suspensions 21 allow a large area in which the arms are freely movable supported. This effectively prevents neck tension.

The chair can also include a lumbar support or a neck support which, on the one hand, can be firmly connected to the seat surface 1, on the one hand, or can be configured independently of this seat surface 1, on the other hand. In particular, like the backrest, these can also be displaceable along a concave movement path.

In the chair shown in FIG. 5, the devices necessary for moving the seat 1 'are mounted directly below it in a housing 2 "supported on three footrests 2'. Here, the seat 1 'is correspondingly tumble on a support 4' by means of two

Rubber rings 6 'and 6 "and a plurality of support springs 10' are attached. Here, a corresponding mounting of the seat 1 'engages around a support plate 5' on the support 4 ', above or below which the rubber rings 6' or 6" are arranged. As a result, the chair can be lifted or displaced on its seat 1 'and a mobility according to the invention is nevertheless guaranteed. The support springs 10 'also serve to reset the seat against undesired rotation thereof.

The rubber rings 6 ', 6 "could also be realized by a rubber ring or a hose running around the outside in the edge area. In the embodiment shown in Figure 5, the forced movement of the seat 1 'according to the invention is ensured by a driven drive ring 1 1', which rotates around the support 4 'and which drives spacers 1 1 "which on a guide track 1 1""with the drive ring 1 1 'revolve. The guideway 1 1 '"is profiled so that a desired change in the inclination angle follows.

As can be seen directly from FIG. 5, instead of the supports 2 ', a central support foot, as in a known desk chair, can also be used. It is also possible to dispense entirely with the supports 2 'and to arrange the arrangement on the floor or on a normal seat. Arranged on the floor or on a low stool, this arrangement can serve as a single set when standing, especially when working on machines or the like, or as a footstool. In particular, it is also possible to combine such a footstool with the seats shown in FIGS. 1 to 3.

The embodiment shown in FIG. 5 is also particularly suitable for a chair / standing seat combination in which the seat surface is moved from a sitting position to a standing seat position by means of a gas pressure spring or similar lifting means. In the sitting position, a person can then take a position for typing or the like, while the standing sitting position is used for activities that can also be carried out while standing. The standing seat position can be provided offset from the sitting position in such a way that standing sitting without further ado, in particular without a handrest or a low-lying worktop.

By changing the drive elements, in particular the guideway 11 '", different movement sequences can be implemented in a particularly simple manner in the arrangement according to FIG. 5. Another drive is also conceivable. In particular, a drive made of linear drives arranged offset with respect to one another, such as, for example, in FIG Flight simulators are used.

The chairs shown in FIGS. 6 to 9 also have a seat 1 "or 1" 'which can be displaced about a pivot point. However, this pivot point is continuously shifted with the movement of the seat 1 "or 1 '", so that the movement can be better described in general in its complexity.

While in the embodiment shown in FIGS. 6 and 7 the movement of the seat 1 "corresponds most closely to the movement of a saddle on a horse's back, the movement of the seat 1 '" corresponds to that in FIGS. 8 and 9 illustrated embodiment em most likely the movement of a saddle on a passer.

Both chairs are characterized by a seat that is forced to move continuously and cyclically, whereby means are provided that unite one

Shift the pivot point according to the movement of the seat. All after

Sit / eb / w known in the prior art. However, facilities point _ 00.

a fixed pivot point, which can be shifted in its height if necessary via re-lockable actuators, but remains in one place during the rotational movement itself.

In addition, both chairs have means which forcibly move at least one point of the seat surface 1 "or 1 '" periodically continuously and cyclically in at least two directions of movement, the period in one direction of movement being greater than the period in the other direction of movement. The one period is preferably exactly twice as large as the other period. In this way, a rocking or rocking movement can be achieved, as is finally realized in the exemplary embodiments described in FIGS. 6 to 9.

In order to achieve this, the embodiment shown in FIGS. 6 and 7 has two rocker arms 30 on the foot 2 ′ ″, which each support the seat surface 1 ″ via a ball joint. The seat 1 "is also supported by a support 31 via a ball joint. The support 31 has a gas pressure spring for height adjustment and to increase the seating comfort and is mounted in a ball shell 32, preferably made of nylon or a similar sliding material.

To increase comfort, the chair also has additional cushions 33 which are rigidly connected to the foot 2 '".

The rocker arms are moved via a Bowden cable 35 guided by rollers 34, which is continuously cyclically forced by a motor 36 is driven, as well as via return springs 37. Due to the cyclical lifting of the toggle levers, the seat surface 1 "is shifted from right to left at a certain frequency, the exact position of the seat surface 1" being determined by the geometry of rocker arms 30 and support 31. On the other hand, with double frequency, the seat 1 ", as can be seen immediately, is also shifted forward and backward or also in height. In this way, a rocking movement similar to that of a saddle on a horse is created, which is extremely calming, even therapeutic , Has an effect.

It goes without saying that instead of the ball joints, other joints, such as toggle joints with sufficient play, or sufficiently stiff springs can also be used.

The embodiment shown in FIGS. 8 and 9, on the other hand, has two rigidly connected, eccentrically and with an angle of inclination ball bearing disks 41 which are arranged below and support the seat surface 1 '"for implementation. The ball bearing disks 41 are driven in rotation by a drive 42 and mounted on a shaft 43. In addition, the seat 1 ″ is secured in a guide (not shown) against unintentional tilting.

By rotating the ball bearing disks 41, the seat surface 1 ″ is excited to a rocking movement, which roughly corresponds to the movement of a saddle on a passer. Here, the seat surface 1 ″ moves from one side to the half turn of the ball bearing disks 41 others, as shown in Figure 9. At the same time, the seat surface 1 '"tumbles during this movement due to the eccentricity of the ball bearing disks 41 through a rotated position, as can be seen in particular from Fig. 8. This tumbling movement has twice the frequency as the lateral movement.

Instead of the mechanical arrangements shown, other drives can also be used. In particular, the means which shift the pivot point in accordance with the movement of the seat surface, or the means which forcibly periodically move at least one point of the seat surface 1 "or 1 '" periodically in at least two directions of movement, can also control devices such as electrical or electronic controls , and corresponding controlled actuators or other adjustment options for the seat and its inclination angle.

The embodiment shown in FIGS. 10 to 12 essentially corresponds to that shown in FIGS. 6 and 7. Here too, a chair is provided with a seat 1 "which is slightly inclined forward and performs a movement which essentially corresponds to a movement when riding. This movement can be made possible by an arrangement corresponding to the arrangement according to FIGS. 6 and 7.

In addition, this chair has a recess 50 in which a leg / footrest 51 is preserved. The leg / footrest has at least one upper surface 52 for supporting one Lower leg or both lower legs and at least one lower support surface 53 as a footrest, as is shown in particular in FIG. 12. In this specific exemplary embodiment, a lower and an upper contact surface 52, 53 are provided for each leg. Here, as shown in the present exemplary embodiment, the upper support surface 53 can be arranged at least in partial areas with respect to the lower support surface 52.

As can be seen in particular from FIGS. 10 and 12, the at / footrest 51 has a mirror plane 55 '(numbered in FIG. 10). In this mirror plane 55 ', the leg / footrest 51 can be moved with respect to the chair foot 2' "or the seat surface 1" and - if desired - can be locked in an angular position (see FIG. 12). This can be achieved, for example, by means of a rod arranged in the leg / footrest 51, which stands on the floor and on which the actual leg / footrest 51 is mounted such that it can be locked. However, other mounts or guides for the leg / footrest 5 1 are also conceivable. If required, mobility of the leg / footrest 5 1 in another direction can also be provided.

As can be seen, only one BeiiW footrest 51 is provided in this chair, which is suitable for both legs. However, a leg / footrest can also be provided which supports only one leg or only one foot. This can be, for example, a legrest in a vehicle, which is only the leg with the foot of which an accelerator pedal is operated. supports. This support then suitably engages the leg from the outside.

In this exemplary embodiment, the leg / footrest 51 is connected to the chair via connecting means 54, which allow the leg / footrest 51 to be folded in or out into the recess 50. On the other hand, it is also conceivable that the leg / footrest 51 is arranged separately from the chair. Likewise, the connecting means 54 can allow another type of relative movement, such as a displacement or the like, between the leg / footrest and the rest of the chair.

In order to make it easier to fold out the leg / footrest 51, a handle 55 is provided on the underside thereof, as shown in FIG. 10.

The chair shown in FIGS. 13 to 16 also essentially corresponds to the chair shown in FIGS. 6 and 7. In the case of FIGS. 13 to 16, however, a backrest 13, which can be displaced along a concave guideway 15, is also provided. The guideway 15 is fastened to holding arms 56, which are connected to a bracket 57 of the foot 2 '"by means of an articulated connection 58 with the foot 2'". Optionally, means for locking the backrest and / or stops that limit their mobility can be provided. In addition, the backrest 13 can also be designed to be pivotable about a pivot point provided at the level of the guide 15. It is understood that such a configuration of the backrest is also advantageous regardless of the other features of the chair. Spring arms 59 are also provided at the upper ends of the holding arms 56, to which arm supports 60 and arm supports 61 are attached. The spring arms 59 can be moved together with the backrest 13 between a writing position (see FIGS. 13 and 14) and a rest position (see FIGS. 15 and 16).

In the writing position, the backrest 13 is inclined forward and only slightly supports the back, the buttocks of a seated person being moved slightly forwards by the U-shaped movement when there is a lateral movement, so that just a load on the back area is caused by a relative movement between back and backrest 13 is avoided, even if the backrest 13 were rigidly arranged, as is the case, for example, in a motor vehicle. Due to the concave movement path of the backrest, this does not play a role in this chair.

In addition, the spring arms 59 are curved outwards in the writing position and encompass the arms and the arm supports 60 from the outside. The suspension allows the person to move the arms to different positions without leaving the armrests, so that the supportive function is retained.

In the rest position, the spring arms 59 are rotated about a pivot point on the upper holding arms 56 and rest on them. This shortens the travel so that the ArnAützen 60 are stored more rigidly. In this way they can be used as supports for getting up. In addition, the armrests 61 are then in a useful position and a person can lean back comfortably and relaxed. It goes without saying that such a separate configuration of the armrests 60 can be advantageous independently of the seat 1 "and the backrest 13. This also applies in particular to the pivot points provided above the shoulders of a seated person and the arrangement of the armrests 61 in which can be moved within limits a writing position.

A headrest can also be provided on the chair. This is preferably not directly connected to the backrest, but is attached to the chair separately in a suitable manner. Lateral supports that engage under the armpits, or an abdominal or lumbar support and / or a chin or neck support can also be provided. The abdominal support or the lumbar support, like the back support, can be made displaceable with a concave movement path.

Claims

Claims:

1. Seat with a forcibly continuously and cyclically moving seat (1, 1 ', 1 ", 1'").

2. Seat according to claim 1, characterized by means which periodically move at least one point of the seat surface (1, 1 ', 1 ", 1'") periodically continuously and cyclically in at least two directions of movement, the one period being larger, preferably twice larger than the other period is.

3. Seat with a stable foot and with a seat, characterized in that the seat (1, 1 ', 1 ", 1'") by one

Pivot point (3) can be shifted.

4. Seat according to claim 3, characterized in that the pivot point (3) is changeable.

5. Seat according to claim 4, characterized in that the pivot point is changed depending on the displacement of the seat surface (1, 1 ', 1 ", 1'") about the pivot point (3).

6. Seat according to one of claims 2 to 5, characterized in that the seat surface (1, 1 ', 1 ", 1'") is displaceable in its inclination angle both in the seat direction and laterally.

7. Seat according to one of claims 1 to 6, characterized by a with the seat surface (1, 1 ', 1 ", 1"') displaceable leg support, which comprises at least one lower leg support (12), preferably with a supporting surface to the side.

8. Seat according to one of claims 1 to 7, characterized by a backrest, the support surface (13) independently of the seat surface (1, 1 ', 1 ", 1'") is displaceable at least along a concave movement path.

9. Seat according to one of claims 1 to 8, characterized by at least one armrest (20) which is resiliently and independently of the seat surface (1, 1 ', 1 ", 1"') arranged at least in the horizontal direction.

10. Use of a seat according to one of claims 1 to 9 in an office chair, in a motor vehicle seat, in a train driver's cab, in an aircraft seat or as a lying aid.