EP0205097A2 - Working chair - Google Patents

Abstract

A work chair (10) has a seat (15) divided into a forward seat part (15.1) and a rear seat part (15.3) of which the forward seat frame part (17.1) and rear seat and back frame part (17.2) are connected with one another by a hinge joint with a hinge axis (18). The frame parts are supported on a pedestal (11) by seat frame supports (20,21). On the column (13) of the pedestal there is provided a column support part (25) which carries the pivot axis (23) and a swivel support part (28). On the pivot axis (23) seat frame supports (21) are mounted. The swivel support part (28) is tiltable by means of an inclination adjusting device with an actuating handle (6) for tilting the plane (E). The swivel support part (28) has forwardly an elongated bearing opening in which the sliding axis (22) is slidable against the force of an adjustable spring. The sliding axis (22) carries the seat frame support (20). The sliding axis can be secured against sliding by an arresting device having an arresting lever (51) with a swivel bar (52). The spring force can be adjusted by means of an elbow lever. For this purpose a grip (45.4) is provided. By swinging the arresting lever (51) up, a pivoting about the pivot axis (23) can be effected by pressure on the backrest (16) with a lowering of the rear surface of the seat (15), while the forward rounded seat region (15.6) maintains its height.

Description

The invention relates to a work chair with a seat and backrest and a base frame with support and adjustment mechanism, the seat and backrest being divided into at least two parts which are articulated to one another and which are supported by levers or arms on the support and adjustment mechanism with the aid of seat and backrest parts Components are supported.

With their body support surfaces, work chairs should adapt optimally to support needs in accordance with the various seating positions of the user. There are numerous proposals for this. The seat and backrest are z. T. divided into several sections and connected to each other in an articulated and / or buildable manner. Since the user very often has to change his sitting position during the page, the chair mechanics should also be such that its function and mobility automatically adapt to the respective needs at least in some areas.

There are basically three seating positions. In the forward leaning seating position for writing by hand or reading documents lying on a table top, the back is inclined forward. In the upright sitting position, especially when operating machines, the back is approximately vertical. In the relaxation or listening position, e.g. B. when talking on the phone or talking, it is pleasant to be able to tilt your back. These three sitting positions should be easy to take up and optimal support should be given to the respective body parts.

Especially in the relaxation or listening position, which is tilted backwards, the seat should no longer lie horizontally, because otherwise there is a risk of slipping and this can only be counteracted somewhat by the design of the fabric, although shifts in clothing and body can occur. For this reason, the seat is usually tilted downwards in the rear. The change of these different positions one tries to adapt with suitable support and adjustment mechanisms of the chair, for so-called dynamic sitting. As a rule, an articulated connection between the seat and backrest is provided, such as, for example, according to DE-OS 33 22 450 or DE-OS 30 36 993, in the first case an articulated lever construction with a fixed articulated axis and in the second case a bendable connection between the seat and backrest are. A large number of other constructions have a similar structure. They differ essentially in the precise position of the articulation points and the length of the levers of the articulated polygons in order to achieve the correct sequence of movements. Some constructions try to position the pivot points of the various supports so that they are largely meaningfully adapted to the pivot point of the user's hip joint. In many cases, this cannot be achieved, and this results in anatomically unfavorable support and movement conditions with some supports or movement sequences.

In the forward-tilted handwriting position, the back generally has no contact with the backrest. When moving back, this only begins approximately when the machine operating position is reached. It has now been shown that it is expedient to make the support between the lower lumbar region and the pelvis unchangeable in the angular position and to adapt the motion sequences of the kinematics to these conditions. Such a 'construction is known in its basic structure from DE-GM 77 21 954. The seat and backrest are formed from three parts, the seat part being divided into a flat part and a rear wedge part. Flat part and wedge part are connected to each other by a horizontal transverse axis. Wedge section and backrest can be '_' fixed together or be connected to each other via an elastic connection. The supporting kinematics is such that when the backrest is pressed back against a self-locking gas spring, the angle between the flat part and the wedge part of the seat part is increased and the front region of the flat part of the seat, which supports the thighs, rises, while the wedge part drops overall and until pivoted to an almost horizontal end position. The flat part is supported via a hinge axis fixed to the frame in the area of the hinge axis between the flat part and the wedge part and a presumably slidable support on a rocker located approximately in the middle area of the flat part. The rocker, in turn, is articulated far in front of the hinge axis of the flat part on the chair frame and has a rocker-like support lever which is continuous under the other hinge axis and on which the wedge part is fixedly arranged. This rocker is provided at the rear end in the area between the wedge part and backrest with an articulated support on a self-locking gas spring. The self-locking gas spring is in turn arranged obliquely downwards at the front and articulated there on the frame. This mechanism requires a plurality of articulated levers with six articulated axes or articulated areas. In addition, this kinematics specifies a very specific movement and it is selected so that the front region of the flat part of the seat is raised when leaning back. The feet are lifted off the floor. Such kinematics are not suitable for a chair that is cheap for all three working positions. Various other efforts are currently showing that the foremost seating area is to be kept largely unchanged at high altitude and that an articulated and / or sliding support is therefore to be provided there, for example according to DE-OS 33 22 450 or DE-GM 78 15 561.

The construction according to DE-GM 77 21-954 is also still lacking a training which enables longer sitting in the forward-bent handwriting position, in which the seat surface is inclined slightly downwards at the front. It is therefore not fully adapted to practical needs, for which it is important that the seat and backrest be optimally adapted to the different positions of use of differently trained and working in different ways.

In the constructions according to DE-OS 33 22 450 and DE-GM 78 18 561, as well as in many other constructions, one has a backrest support which is articulated to the frame in the area of the column and on which in turn the seat which is variable in the angular position relative to the backrest is supported in an articulated manner , which results in a pivoting between the pelvis and spine when leaning back, which is undesirable. The articulated supports of the rear part of the seat according to DE-GM 78 15 561 allow a stretched position between the two parts of the seat surface, but no further lowering of the rearmost end of the seat, which would accommodate the natural support of the forces in the reclined position.

In the construction according to DE-OS 30 36 993 there is already support for the seat and backrest with only a few articulated axes and an articulated coupling of the seat and backrest which interacts with the few supports. However, these supports are provided outside the seat and Therefore it is not suitable for many chair constructions. You do have an arrangement that lies far forward and does not lift your thighs when you swing it back the angular position between the pelvis and spine changes when you lean back in a way that is not desired by many users and the spring-loaded articulation between the seat and the backrest is required. The inclination adjustment of the seat is always associated with a corresponding inclination adjustment of the backrest, which is also undesirable for many users or use situations. From DE-GM 76 12 629 a device for adjusting the seat angle on chairs is known, in which the seat can be adjusted with respect to the base frame with a cam arrangement in its inclination. The backrest in turn is arranged on the base frame in an adjustable manner. They are not linked together.

This chair is not suitable for dynamic sitting. It shows everyone how to use tilt adjustment cam and an articulated axis to achieve an appropriate tilt adjustment, in which the curved path includes the detent. However, this version is not suitable for direct use on a support mechanism for dynamic seat and backrest support.

The invention has for its object to provide a support and adjustment device for a work chair that allows the preselectable and / or automatically assumed relative position of the various support elements of the seat and the backrest in a simple and safe functioning manner with a simple structure and anatomically favorable support.

To solve this problem, the patent / patent application in accordance with legal requirements and uniformity in accordance with Article 82 treated. _'Of the European Patent Convention a group of inventions or

Features of the invention, which are interconnected in such a way that they implement a single general inventive idea, which consists primarily in working chairs of the type mentioned with seat and back supports divided into several sections for the body of the user, in which the sections with suitable kinematics based on the dynamics of sitting in different working positions are supported by a support and adjustment mechanism on the base frame, to improve the design of the support and adjustment mechanism in several directions, namely with regard to the selection of the position of the articulation points, the length and angle of the articulated lever to form a suitable simple kinematics, the inclination of the joints to each other and the adjustable spring support of the mutually movable parts, if necessary with locking and possibly in a compact, stable, inexpensive and nested design of the support d adjustment mechanism, these parts all interacting as a whole, but can be subject to different variations in their individual sub-areas, and above all in the form of sub-combinations can be applied to otherwise differently designed chair support mechanisms.

Accordingly, a first solution area provides that in a work chair with seat and backrest and foot frame with support and adjustment mechanism, the seat being divided into a front seat part and a rear seat part, which are articulated to one another, and the backrest with the rear seat part is connected to a largely unchangeable angle and the seat parts on the frame Articulated axes are pivotable and are supported against their force in their relative angular position relative to one another, the rear seat part being supported on a frame-fixed articulated axis located below the joint axis of the seat part so that it rests downwards from the foremost stop position of the spring-loaded support when pressure is exerted on the backrest tends to be the special feature of the invention is that the two hinged seat parts are supported by only one support or a few supports on the base and the front seat part near the front end of the seat has its articulated axis, the hinge axis of the rear seat part behind the hinge axis of the front seat part is located and one of the hinge axes fixed to the frame is movably arranged against the force of a spring.

As a result of the aforementioned combination of features, the legs of a chair in which the rear seat part and backrest are essentially invariable in angle and the back seat part is lowered when leaning backward - as is known in the case of completely differently constructed supports _: because the foremost support for the movement of the seat remains practically unchangeable as a result of leaning back. But not alone, but rather the number of articulated axes and the number of support levers is considerably reduced and a more favorable position for the articulation on the base frame is possible, which enables a smaller and more compact but nevertheless more stable support and above all a better one, the anatomical Conditions favorable movement sequence and a more suitable support of the body parts allows, additional simple options for an inclination adjustment and Training of the adjustable suspension are given. It is important that the hinge axes are now opposite to each other in relation to the original construction and that support is not required directly in the area of the seat joint lying between the seat parts, as was the case with previous designs according to DE-PS 1 256 840, DE-GM 77 21 954 and DE-GM 78 15 561 has always been considered necessary, as a result of which the number of supports and the articulated lever is considerably reduced and because of the shorter support lengths with a favorable movement sequence and a favorable support ratio, a very stable support is made possible.

According to one embodiment, the seat surface parts can be formed with the aid of two articulated frame parts or frame-like shell parts, under which seat frame supports projecting downwards and inwards are fastened, which have fastening sleeves or the like that can be plugged onto the joint axes. With simple means, the supports can be carried out in a stable manner and the forces in the seat can be transmitted, which take place both with regard to the load applied by the person and with regard to the transmission of the support forces from the front seat area via the rear seat area to the backrest and vice versa.

To enable a favorable movement sequence with optimal kinematic conditions, one expediently provides the articulated axis of the frame directly in front of the column of the base frame and the articulation axis of the seat parts lies between the parallel vertical planes running through the vertical column and the pivot axis. The articulated axes and the support on the base are in this area close to each other and thus enable the favorable transmission of forces and especially the particularly favorable movement of the rear seat part, which begins to pivot from a position that is already slightly tilted backwards relative to the top dead center position when the backrest is tilted backwards.

The plane in which the two articulation axes of the support lie and the seat frame level or the main seat surface level appropriately enclose an acute angle of a few degrees in the front spring stop position ... This makes it possible, on the one hand, to position the seat surface horizontally in the vertical machine seat position and To enable a correspondingly favorable support of the backrest and, on the other hand, with a suitable adjustment, also tilt the seat at the front in order to assume the forward-inclined paperwork position and still achieve the relaxation and listening position with favorable kinematics with favorable buttock support with few articulation points.

The position of the hinge axes and the length of the levers are expediently chosen such that the front seat part sweeps over an angular range of 3 ° and the backrest over an angular range of approximately 16 ° when pivoting against spring force. Then you get through the special construction with the joints and the compensation in the seat shells and the upholstery an angle ratio of about 1: 2.5 to 1: 3, as it is favorable for the relative angle of inclination between the seat and backrest in the rearmost position .

As such, the sliding axis can be provided in the area of the base frame if the other design is chosen accordingly. However, it is particularly advantageous that the provided on the column support part Swivel axis is immovable and the front joint axis mounted on the swivel support part are designed to be displaceable backwards against spring force. This means that the rear axle, which supports the entire remaining joint parts in a solid and tilt-free manner, is available and the front axle is available as a sliding axle, which does not impair stability. An essential advantage is also to be seen in the fact that the spring force is now transmitted to the backrest via the front seat part and its support as a tie rod, which results in favorable lever and force transmission ratios. In addition, a lock in the area of the sliding axle at the front can be conveniently accommodated, especially since a seat height adjustment is usually still required at the rear. A spring force adjustment device can also be conveniently provided in the vicinity of the sliding axis, where it can be actuated well because it lies in front. The advantageous design of the kinematics with its cheap articulated axes and levers allows for a practical design in which the seat frame supports can be designed to extend far out to below the seat edge, while the supports of the articulated axes in the vicinity of the appropriately associated column in the pedestal in a torsion-proof manner with the Support tube connected bearings are formed.

Another advantageous part of the solution according to the invention, which can be used in conjunction with the features listed above, but also only in connection with its own features, provides that a work chair with a seat and backrest and a base frame with support and adjustment mechanism, with seat and the backrest are supported movably in their angular position on articulated axles and against spring force, which has the special feature that the seat and backrest are supported on the base frame by only two supports or two pairs of supports are whose one articulated support axis (swivel axis) is attached to the part of the support and adjustment mechanism (column support part) which is firmly connected to the base frame and the other articulation axis is mounted on a swivel bar part which in turn is mounted on the first-mentioned articulated axis fixed to the base frame ( Pivot axis) is pivotally mounted and a tilt adjustment device is arranged between the column support part fixed to the base frame and the pivot support part, by means of which the relative height of the pivot axis mounted pivotally tiltable (sliding axis) can be changed relative to the pivot axis fixed to the base frame (pivot axis). Through this design, on the one hand, in addition to the dynamic pivoting or inclination of the seat surface parts and backrest parts against spring force, an additional inclination adjustment option is provided, which allows the initial position of the seat and / or backrests to be adjusted, and that with the joint axes which are already present or necessary, and in addition the an articulated axis is used at the same time to support the seat part and to support the supporting part, which reduces the number of components and improves the clarity of the construction and kinematics, without taking the inclination adjustment into account in the special design of the kinematics in particular lever lengths or positions of the axes would. Such an inclination adjustment can also be carried out if the one axle is not sprung and the suspension is provided at a different location than in the exemplary embodiment and if the backrest is not firmly connected to seat parts. For the adjustment of the pretreated construction, however, it is of particular importance to provide a basic inclination adjustment, because this is the starting position especially for the bent paperwork posture and the Adaptation to other user needs is made considerably easier with simple means.

The inclination adjustment device can be achieved in many ways, for example by interposed screw parts or the like. A particularly advantageous embodiment provides that the inclination adjustment device is formed with the aid of at least one cam disc mounted pivotably about a turning axis provided on one of the mutually adjustable support parts, to which a cam support element, for example a coupling pin, attached to the other support part acts, and wherein an adjustment handle and Locking means are provided. While a screwing device requires corresponding threads and a corresponding space, a curve adjustment device can be built flat and the curve inclination can be well adapted to the requirements. It can also be predominantly formed from easily produced stamped and turned or molded parts.

In an expedient embodiment, in which the accommodation of a spring is also to be taken into account, one expediently provides a column support part with two arm-shaped column support legs encompassing the spring space and facing forwards, these having outward-pointing coupling pins in the region of their front ends, which extend into the Intervene cam slots of the inclination cams, which in turn rest only on the outer surfaces with play and move inside the support legs of a U-shaped swivel support part that overlaps the column support legs and the inclination cams, all other components of the support and adjustment mechanism being located, the inclination cams using a, preferably divided into individual bearings, the axis of rotation are mounted on the swivel support part.

With such an arrangement, one expediently provides that the support legs of the pivoting support part have latching depressions which are recessed in the shape of a circle about the axis of rotation in the lower edges _{' of} the support legs and into which the latching projections of an actuating bracket connecting the two tilting cam disks engage. Such an easy-to-manufacture and easy-to-assemble design is also easy to operate at a convenient location and offers great operational reliability.

The above-described support and adjustment mechanism with a spring-loaded connection between the individual areas of the body supports requires a suitably designed and suitably dimensioned spring at a suitable location, which can be designed in many ways.

Due to the favorable design of the kinematic conditions and above all because the back restoring spring force is supported over long lever elements acting as coupling elements and then again small displacement paths of the axis, a single strong compression spring can be accommodated cheaply. Since the user desires different restoring forces, such a strong compression spring must be able to be easily adjusted in its spring force.

The wedge and lever arrangements used for this purpose on the one hand are structurally complex, on the other hand often difficult to operate and can lose their user-friendliness, especially in continuous operation. Accordingly, a further part of the configuration according to the invention provides an expedient spring force adjusting device which can be used in cooperation with the other features discussed above and, above all, with regard to the accommodation, but also only in sub-combinations with partial features of the above-mentioned main and secondary claims can be used. because they're for diverse chair spring settings with other kinematic ratios is suitable. It is useful to see a work chair with a seat and backrest as well as a foot frame with support and adjustment mechanism, the seat and backrest being divided into at least two parts that are articulated and the parts are supported with separate support levers, between which and / or the support elements fixed to the frame, at least one Spring is arranged, which is equipped with an adjusting device that changes the spring force, as a special feature that the spring force adjusting device is formed with an angularly adjustable toggle lever, which has a knee element in the knee joint, which by means of a toggle lever support element (toggle lever housing ) supported adjusting screw is adjustable. With a simple structure, favorable support and friction conditions, toggle lever arrangements allow the support distance, which can be changed in terms of their support spacing, to support large forces with small actuation forces. Precisely these are conditions that a chair spring adjustment requires, but have not been used at this point, although there are various spring adjustment devices such. T. with screws and large buttons and the like.

for relatively strong springs. The toggle lever arrangement is used here particularly cheaply because the spring force of a compression coil spring increases progressively during compression and the adjusting force of a toggle lever decreases with increasing extension due to the changed angular position. Such a favorable combination of two properties for a small-scale arrangement ensures long, safe, easy-to-use operating conditions. It is expedient to position the toggle lever arrangement in the axial direction of a compression spring together with the latter in the plane of the two joint axes (pivot axis and sliding axis). to support yourself on this. This means that no further transmission mechanisms are required and the forces are directly and cheaply supported. The toggle lever arrangement can expediently be arranged in a box-like toggle lever housing which is open at the front and at the top and which _; in turn supports the set screw acting on the knee element and on the other hand supports the abutment of the knee lever and also a spring bearing. Such a box-like element can also be conveniently arranged in the accommodation of the supporting and adjusting mechanism, which is also designed with parallel walls, and offers favorable manufacturing and connection conditions for the remaining elements. The spring bearing can expediently be a spring support wall of the toggle lever housing, which carries a guide pin in the pressure plane, on which a spring counter bearing part is displaceable, which holds and centers the compression spring between its support region and the spring support wall. This results in a spring and spring adjustment unit that is easy to manufacture and inexpensive to install. The spring counter bearing part expediently has a system part cylinder for support on the hinge axis or its axle tube.

The front toggle lever facing the sliding axis expediently has a partial cylinder contact element, which is supported directly on the sliding axis.

The support and bearing elements for the support, which rotates only slightly, are inexpensively integrated into the components which are required anyway. The toggle lever parts are expediently formed by double-armed, interlocking elements, the rear of which are supported in the toggle lever housing side walls with the aid of a support pin.

With many uses of a work chair, the spring-loaded deflection of the backrest and the lowering of the seat are not desirable. It is therefore advisable to make the shifting and suspension options switchable or lockable. For this purpose, the sliding axis or the suspension device can expediently be equipped with a locking device which prevents the displacement movement. This can act either in the area of the sliding element of the spring or directly in the area of the displaceable axis. It can be conveniently provided that the locking device is formed with a locking pivoting lever pivotable about the sliding axis, which is supported in the locking position approximately in the plane connecting the axes to housing parts of the pivot bearing part having the longitudinal sliding bearing and with its locking from the locking position to one Sliding plane parallel position is pivotable about 90 °. Such a lever can be easily designed, assembled and operated cheaply. The locking device can have two disk-shaped arms, which are arranged outside the toggle lever housing enclosing it and against which the limiting collars of the sliding bearings rest against one another for mutual position fixing. The various, interlocking elements with a relatively large torsion-resistant support base are nevertheless accommodated in a manner that is easy to assemble and saves space. The disc-shaped arms can be connected by a locking web, the locking ends of which protrude above the disc-shaped arms and lie in the region of the supporting legs of the pivoting support part, and the locking pivoting lever has a pivoting rod with a handle, which is preferably located laterally below the front region of the seat. Such a design is easy to manufacture, consists of a few parts, can be easily assembled and operated.

Usual chair mechanics are mostly on one because of the wide protruding seat Pillar-supported arrangement designed very wide, so that the forces are absorbed cheaply. can. This results in a large space requirement for the various support and actuation elements under the seat and often in the area of the backrest, which usually requires a large cover, whereby the chair loses the appearance of a slim object. In addition, a variety of mutual displacement locking means, such as locking rings, spacers and the like, are required. The invention now has a way that is both appealing and advantageous in terms of construction and manufacture, as well as advantageous in terms of assembly, with a torsionally rigid design providing a box construction which is used both on work chairs with the aforementioned features and on other work chairs with the features evident from the following combination can. It has a work chair with a seat and backrest and a foot frame with support and adjustment mechanism, whereby the seat and backrest are divided into at least two articulated sections that are supported by levers and / or arms (seat frame supports) that support the seat and backrest parts Supporting and adjusting mechanism components are supported, the special feature is that various supporting and adjusting elements are formed by several partially open, U-shaped inner spacings on the respective outer spacing of the other nested supporting and adjusting housing parts. So you choose a box-like box construction, which is made on the one hand easily from stamped and bent parts and on the other hand hampers each other in certain movements due to the close contact of the walls, but enables the desired ones and at the same time enables large support bases for the rotatable but torsionally rigid support of many parts . It is also easy to install and clear. It can Swivel support part can be designed as a U-shaped bearing part open at the bottom, the end regions of which receive the swivel bearings and the sliding bearings and which project freely beyond the central connecting web. This gives you a stable component that spans the outside, the bearing is easy to get to and which nevertheless offers the necessary great bending and torsional stability and, on the other hand, encloses the other components. If desired, the already clear construction can be covered with simple small plastic cover parts. Material for the production of covers is also saved considerably.

An embodiment of the work chair according to the invention is described below with reference to the drawings.

• Fig. 1 Die teilweise schematsierte Schrägansicht -eines Arbeitsstuhles;
• Fig. 2 die teilweise schematisierte Seitenansicht von links auf einen Arbeitsstuhl nach Fig. 1;
• Fig. 3 die als Explosionsdarstellung gefertigte Schrägansicht von hinten links oben auf die Abstütz- und Verstellmechanik ohne Sitz und Sitzrahmenträger;
• Fig. 4 die Draufsicht auf die Anordnung nach Fig. 3 im zusammengebauten Zustand, wobei verdeckte wesentliche Elemente gestrichelt dargestellt sind - die Befestigungshülsen der Sitzrahmenträger sind nur in dieser Figur zu sehen -;
• Fig. 5 die Seitenansicht der Anordnung nach Fig. 4 bei geschnittenen Achsen und abgenommener Schutzabdeckung mit angedeuteten Verstellmitteln;
• Fig. 6 einen Längsschnitt durch die wesentlichen Elemente der Einrichtungen nach den Fig. 3 bis 5;
• Fig. 7 einen Längsschnitt durch die Federabstützung mit Kniehebelfedereinstellung, wie sie aus den Fig. 3, und 6 hervorgeht, jedoch ohne den Griff für die Verstellung;
• Fig. 8 eine der Fig. 5 entsprechende Darstellung, bei der jedoch die Seitenwand zur Veranschaulichung der Neigungsverstellung aufgebrochen ist;
• Fig. 9 einen Schnitt längs der Linie 9-9 in Fig. 8, wobei im wesentlichen nur die in der Zeichenebene. liegenden Elemente dargestellt sind und die im Zwischenraum liegenden Teile der Federspannung der Ubersichtlichkeit halber weggelassen sind.

Show it:

• Fig. 1 The partially schematic oblique view of a work chair;
• 2 shows the partially schematic side view from the left of a work chair according to FIG. 1;
• 3 shows the oblique view, produced as an exploded view, of the support and adjustment mechanism without a seat and seat frame support from the top left of the rear;
• FIG. 4 shows the top view of the arrangement according to FIG. 3 in the assembled state, hidden essential elements being shown in dashed lines - the fastening sleeves of the seat frame supports can only be seen in this figure -;
• 5 shows the side view of the arrangement according to FIG. 4 with the axes cut and the protective cover removed with indicated adjustment means;
• 6 shows a longitudinal section through the essential elements of the devices according to FIGS. 3 to 5;
• 7 shows a longitudinal section through the spring support with toggle lever spring adjustment, as can be seen in FIGS. 3 and 6, but without the handle for the adjustment;
• FIG. 8 shows a representation corresponding to FIG. 5, but in which the side wall has been broken open to illustrate the inclination adjustment;
• Fig. 9 is a section along the line 9-9 in Fig. 8, with essentially only those in the plane of the drawing. lying elements are shown and the parts of the spring tension lying in the space are omitted for the sake of clarity.

The work chair 10 has a five-arm base 11, with conventional casters 12 and a height-adjustable column 13 and a body support 14 with seat 15 and backrest 16, which are attached and supported on a frame 17 in the manner described below.

Instead of the frame 17, shell parts can also be provided. In the following, however, only one framework will be mentioned for the two design options.

The frame 17 consists of two frame parts, namely a front seat frame part 17.1 and a rear seat and back frame part 17.2. These are articulated to one another with the aid of two joints 18.1 and 18.2 and the joint axis 18. The axis 18 lies in the area of the user's ischial bumps. A peculiarity can be seen in this. The rear seat frame part 17.3 serves to support the buttocks of the user via the cushion area of the rear seat part 15.2 and is essentially immovably connected to the back frame part 17.4 and the associated padding 16.4, but is padded in such a way that the pelvis and lower part of the spine are always approximately the same angular position to each other. On the front seating area 15.1, the support for the thighs is designed in the usual way with a front rounding 15.6 for support up to approximately the knee area.

The two seat frame parts are each over two seat. frame supports 20 and 21 supported on axes 22 and 23. The seat frame supports are designed as push-on elements with fastening sleeves, which are suitably screwed or otherwise connected to the frame parts or the shell.

The rear hinge axis is designed as a pivot axis 23 which is fixed to the frame and is mounted in a column support part 25. The column support part 25 has two column support legs 25.1 and 25.2, which project tangentially forward from the part-cylindrical connection area 25.3. The column support part 25 is attached to the support tube 26 of the height-adjustable column 13 in a suitable manner, for example welded.

The pivot axis 23, since it serves several purposes, is designed with multiple members. It has an inner rod-shaped support axis 23.1 and an axis tube 23.2 in which the support axis 23.1 is rotatably supported by plastic bearings, not shown.

The seat frame supports 21.1 and 21.2 are attached to the ends of the pivot axis 23, just as the seat frame supports 20.1 and 20.2 are attached from the outside to the front joint axis of approximately the same length, which is designed as a sliding axis 22.

The shift shaft 22 is supported in a pivot support member 28 which ragschenkeln as an extreme, to open below U-profile-shaped support part with two _T 28.1 and 28.2 as well as a connecting web is designed 28.3. The swivel support part 28 encompasses all other elements of the support, swivel and adjustment mechanism. The swivel support part 28 has in each leg 28.1 and 28.2 in the rear bearing area 28.5 and 28.6 a profiled, plastic pivot bearing 29: 1 and 29.2, which is rotatably and fitted onto the axle tube 23.2 from the two outer sides and into which from FIG. 3 , 5 and 8 in their shape visible profiled bearing recesses 30 fits. In the front areas 28.7 and 28.8 of the legs 28.1 and 28.2 of the pivoting support part 28, elongated holes 31.1 and 31.2 are provided, in which sliding bearings 32.1 and 32.2 made of plastic and each with an inner limiting collar 32.3 and 32.4 are inserted from the inside. The sliding bearings 32 have a recess corresponding to the diameter of the sliding axis 22 and allow a stroke H, as can be seen from FIGS. 5 and 8, unless the locking described below prevents the springing.

The sliding axis 22 is spring-loaded against the pivot axis 23.

The spring support, which is adjustable in terms of its hardness or spring force, can be seen particularly well from FIGS. 3, 4, 6 and 7. An upward and forward toggle lever housing 35 is provided with a rear spring support wall 35.3 and a lower housing wall 35.4 and spring housing side walls 35.1 and 35.2. In the spring support wall 35.3, a guide pin 36 is fastened, which protrudes to the rear and on which a spring counter bearing part 37 is slidably guided. The spring counter bearing part has a shaft 37.1 with a guide bore 37.2 which fits and slides on the guide pin 36. The spring counter bearing part 37 has a support region 37.4 with a contact part cylinder 37.5. With this area, the spring counter bearing part, as can be seen particularly in FIG. 6, is supported on the axle tube 23.2. The compression spring 38 centered on the shaft 37.1 is designed as a strong helical compression spring and is supported on the spring counter bearing part 37 on the one hand and on the spring support wall 35.3 on the other hand, as can be seen from FIGS. 3, 4, 6 and 7.

A support pin 41 is fastened in the toggle lever housing 35 in the two side walls 35.1 and 35.2. It lies in the connecting plane E, in which the axis of the guide pin 36 also lies. The double-armed toggle lever 42 is supported on the supporting pin 4l, which in turn is articulatedly connected to the knee element 43. Connected to the knee element 43 is the front double-armed toggle lever 44, which has a part-cylinder contact element 44.1, which is supported directly on the front sliding axis 22 and which has a width extension corresponding to the distance between the two arms in order to ensure stable support.

On the knee element 43 there is an adjustment screw 45 arranged transversely to the plane E, which it penetrates in the middle in its threaded bore and which is equipped with a stroke limiter 46 and has a shaft 45.1 which is provided in a slot 47 of the toggle lever housing wall 35.4 so as to be longitudinally displaceable.

Under the head ⁴ 5.3 of the adjusting screw 45 there is a washer 48 which enables the adjusting screw 45 to slide during the adjustment. As can be seen, by screwing the adjusting screw 45 in and out, which is of a suitably large size shown in ^FIG _. ^{7 omitted} handle 45.4 is provided, the toggle lever in its distance between the support pin 41 and pivot axis 22 can be changed. As a result, the spring 38 is biased more or less. The Kniehebelanordnun ^g offers the particular advantage of this is that it is easier to adjust smoothly with increasing spring tension, which naturally increases progressively because the toggle takes a ^g e-stretch tere location.

As can be seen, the sliding axis 22 can move backwards in the slot 31 against the force of the spring 38. The entire toggle lever arrangement with the toggle lever housing 35 moves backwards. In order to make such movement impossible when it is not desired, a spring locking device 50 is provided. For this purpose, a U-shaped locking swivel lever 51 in profile is provided. This consists of two arms 51.1 and 51.2, which are disc-shaped and rest on the outside of the side walls 35.1 and 35.2 of the toggle lever housing 35 and are pivotably mounted on the sliding shaft 22 with suitable bearing bores 51. As a front connection they have a locking web 51.3, which is inserted into corresponding recesses and ver with the disk-shaped arms 51.1 and 51.2. is welded. It has protruding locking ends 51.5 and 51.6 which are as long as the swivel support part 28 is wide. At the same time, a swivel rod 52 is welded on, which is equipped with a handle 52.1 (FIG. 1), which lies laterally under the seat 15 and is used for actuation. The side walls 28.1 and 28.2 of the swivel support part 28 are designed in their front regions 28.7 and 28.8 in the upper corner region 28.9 with a quarter circle, the center of which is the center point of the front half-circle of the elongated bearing hole and which has a somewhat smaller radius -.iat than the distance of the support surface 51.9, the arresters 51.5 and 51.6 from the center of the sliding axis 22. Otherwise, the downward-reaching support region 53 is approximately tangential, so that the arresters 51.5 and 51.6 can rest there and, as can be seen, prevent displacement of the sliding axis 22. In the position not shown, pivoted upward about the center of the sliding axis 22, the sliding axis can be freely moved backwards in its elongated hole because the locking elements 51.5 and 51.6 are parallel to the plane E.

The swivel support part 28 engages around the column support part 25 from the outside and is supported in an adjustable manner in relation to this. A tilt adjustment device 60 is provided for this. This has two inclination cams 61.1 and 61.2, as can be seen particularly well in FIGS. 3, 8 and 9. "These are in turn pivotally fastened with bearing nuts 62 and bearing bolts 63 as rotation axis 64 in the support legs 28.1 and 28.2 of the swivel support part 28.

The inclination cams 61 each have a cam slot 61.3 and 61.4 which, as can be seen in FIG. 8, increases considerably at a distance from the turning axis 64 and in which a coupling pin 65 engages. The coupling pins 65.1 and 65.2 are fastened in the region of the front end of the column support leg 25.1 and 25.2 projecting outwards, as illustrated in FIGS. 3 and 9, and each engage in the cam slot 61.3 and 61.4.

The inclination cams 61.1 and 61.2 have actuating arms 61.5 and 61.6 with inwardly bent spring supports 61.7 and 61.8 on which the detent springs 66.1 and 66.2 are supported. As shown in FIG. 9, these act on the actuating bracket 67. This is designed as a bracket part which connects the two actuating arms 61.5 and 61.6 and can be displaced downward against spring force and which has semi-cylindrical locking projections 67.3 and 67.4 on its side arms 67.1 and 67.2. These are arranged such that they can engage in the semicircular locking recesses 68. The latching depressions 68 are punched out in a circle around the axis of rotation 64 at a suitable distance in the side walls 28.1 and 28.2 of the swivel support part 28; 5, namely arranged in a part-circle, so that the inclination cams 61 can be pivoted and locked in several positions, so that the relative height of the sliding axis 22 relative to the pivot axis 23 to adjust the seat and backrest output inclination can be changed over a wide range.

In the support tube 26 there is a height adjustment device, not shown, of which only the upper actuation end 70 can be seen. To adjust the height, this actuation end 70 must be pressed. For this purpose, an actuating lever 71 is provided, which is pivotably mounted in bearing bores 72. 3 and 6, the bearing bores 72 are formed in the uppermost regions of the column support legs 25.1 and 25.2 and they take up the axis of the actuating lever 71. Swivel limits 73 form the system for the rattle-free support of the height adjustment device in one end position. The operating lever is omitted.

The work chair described in detail is used as follows.

With the help of the handle, not shown, the column 13 of the base frame is adjusted to the desired starting height for the user in the usual way with the aid of the actuating lever 71.

With the help of the operating bracket 67, the initial inclination of the seat 15 and the backrest 16 is adjusted. The actuating bracket 16 is pulled downward against the force of the springs 66, so that the locking projections 67.3 and 67.4 lock the recesses 68. _' leave. By pivoting the actuating bracket 67 forwards or backwards, the position of the plane E relative to the vertical column 13 or to the floor is adjusted in its inclination such that the sliding axis 22 assumes a desired height position relative to the pivot axis 23. This setting is chosen so that the seat 15 for most uses of the chair is comfortable in the non-reclined position. That is, a very much by hand writing user will choose an inclination in which the seat, not shown in Fig. 2, runs horizontally in the starting position, but is inclined slightly at the front, so that the plane E roughly horizontal. In this position, one can bend forward comfortably and write by hand without the blood circulation in the legs being impaired by excessive support on the front edge region 15.6 of the seat 15.

By turning the handle 45.4, the toggle lever is stretched more or less and the prestress of the spring 38 is thereby set.

The user can now lean back and try out the spring tension and simply readjust it according to his wishes. In this process, the spring locking device 50 must be pivoted with its pivot rod 52 upward, so that the locking 51.1 and 51.2 are parallel to the plane E and allow free movement.

If the user now takes up the machine operating position by erecting his upper body, his lumbar region is supported by the arching of the backrest 16 in the associated area, so that he sits upright and the pelvis and spine take a favorable position relative to one another, the seat 15 still being in the position shown in FIG 2 shown, stretched position of the two seat frame parts 17.1 and 17.3 and the spring 38 has not yet been pressed. The pelvis and buttocks are supported with the anatomically correct unit of the rear seat part 15.3 and backrest 16, which is supported on a practically immovable frame 17.2. If a relaxation or listening position is now desired, in that the back is to be leaned back, the user only needs to shift the weight backwards and press accordingly on the backrest 16. Then the rear seat part 15.3 and backrest 16 pivot around the pivot axis 23 fixed to the frame, maintaining their relative angular position to one another, so that the spine and pelvis maintain the anatomically favorable position relative to one another. The term "largely unchangeable angle" is to be understood in this sense. Certain elasticities will always be present in the frame or shell construction or the upholstery and are also desirable. However, no articulated or easy to bend elastic connection between the rear seat part and backrest should be provided.

To the extent that the pivoting about the pivot axis 23 results from pressure on the backrest, the articulated axis 18 will move downward with respect to the pivot axis 23, since it moves on a corresponding partial arc and not even in the preferred embodiment shown the top dead center position, but starting from a slightly twisted starting position and immediately travels a not inconsiderable way down when pivoting. Accordingly, the coupled front seat part is 15.1 entrained with the front seat-frame part 17 ₁ and pivoted around the slide axis 22, which is easily pivoted because of the fixed coupling of and staring formation in the slot 31.1 and its associated sliding bearings 32 and moved backward, so that the front seat frame part 17.1 takes a slightly rearward downward sloping position, which is, however, less inclined than the inclination of the rear seat frame part 17. 3 because it is further forward and is equipped with a long coupling lever arm in the front seat frame part 17.1 and is accordingly carried along becomes. This results in an overall downward inclined position of the support surface of the seat 15, the elasticity of the seat formation by tension belts or corresponding shell parts and the padding creates a certain compensation, so that there is no sharp bending movement about the axis 18 in the upper region under the Buttocks take effect. The necessary material of the covering material results from the design of the seat upholstery indicated with corresponding waves. Thus, the force component of the user to be supported, which results in the direction of the spine, is now supported on a support surface of the seat, which is provided almost at right angles thereto, while the force component running in the direction of the backrest is supported on the backrest. So there is no slipping of the buttocks and thighs to the front and therefore no shifting of clothing. Also, the knee joints practically do not rise because the sliding axis 22 is arranged near the knee and even with a slight push backwards and possibly downwards, so that the front seating area with the rounded portion 15.6 practically retains its height. There is only a slight change in the angle between the upper body and thigh around the hip joints, which, however, are favorably supported by the position of the joint axes 18, 22 and 23.

If the user bends forward again, the spring 38 pushes the sliding axis 22 in the elongated hole 31.1 and 31.2 of the sliding bearing 32 to the front, as a result of which the articulated axis 18 of the seat surface parts is pulled forward and thereby the rear seat part 15.3 and backrest 16 about the axis 23 to the front be pivoted back into the starting position shown in Fig. 2.

If you want a back support that is not yielding apart from the elasticity of the upholstery, even with strong ones Lean back, you can lock the sliding axis 22 by touching the handle 52.1 and pivoting its associated swivel rod forward about the center of the sliding axis 22, so that the locking members 51.5 and 5 ₁ .6 for bearing against the support legs 28.1 and 28.2 in the Level E and thereby prevent the sliding movement of the swivel axis.

The angle between the plane E and the front seat frame part 17.1 and the rear seat frame part 17.3 in the extended position - as shown in FIG. 2 - is advantageously about 10 °. An angular range of approximately 3 ° is expedient for pivoting the front “seat frame part 17.1 about the sliding axis 22. An angular range of approximately 16 ° is expedient for pivoting the rear seat and back frame part 17.2 about the pivot axis 23. This ratio of approximately 1: 5 would in itself cause an excessive angle of inclination between the thighs and back, but the elastic design of the seat shells or other support elements of the upholstery compensates for the entire seat angle, so that overall an angle ratio in the extremely swung-back position of approximately 1: 3 is reached.

The support of the seat frame parts is shown with two-part seat frame supports, that is, with pairs of seat frame supports on continuous axes in the exemplary embodiment. Instead of such paired seat frame supports, one can also provide one-piece seat frame supports which are articulated accordingly. In this sense, the alternatives in the claims are to be understood, where it says only one support or a pair of supports. For the invention it is important to have as few articulated axes and associated articulated levers as possible in each case viewed in one plane of the kinematics, because they are advantageous from many known ones There are a number of levers and joints that differ from constructions that are viewed in a kinematic level, but that do not provide better dynamic seat support. It is also particularly advantageous that the rear pivot axis is used for multiple support of pivotable parts, namely the support of the seat frame supports 21.1, 21.2 and thus the rear seat part and the back, and on the other hand the pivotable support of the pivot support part 28 and also the pivotable support of the spring 38 via the spring counter bearing part 37 with the contact part cylinder 37.5. On the one hand, low-cost force transmission is achieved and, on the other hand, a large number of articulation points are concentrated on a single multiple articulation area.

• Der Arbeitsstuhl (10) hat einen in einen vorderen Sitzteil (15.1) und einen hinteren Sitzteil (15.3) unterteilten Sitz (15), dessen Vordersitzrahmenteil (17.1) und Hintersitz- und Rückenrabmenteil (17.2) durch Gelenke mit einer Gelenkachse (18) verbunden sind. Die Rabmenteile sind mit Sitzrahmenträgern (20, 21) an einem Fußgestell (11) abgestützt. Dabei ist an der Säule (13) ein Säulentragteil (25) vorgesehen, welcbes die Schwenkachse (23) und ein Schwenktragteil (28) trägt. An der Scbwenkaehse (23) sind die Sitzrabmenträger (21) angebracht. Das Scbwenktragteil (28) ist mit Hilfe einer Neigungsverstelleinrichtung mit einem Betätigungsbügel (67) zur Verschwenkung der Ebene (E) verschwenkbar. Das Schwenktragteil (28) bat vorne Langlocblager,in denen die Scbiebeacbse (22) gegen die Kraft einer einstellbaren Feder verschiebbar ist. Die Scbiebeachse (22) trägt die Sitzrahmenträger (20). Die Schiebeachse (22) kann mit einer Arretiereinrichtung über einen Arretierscbwenkhebel (51) mit einer Schwenkstange (52) gegen Verschiebung gesichert werden. Die Federkraft kann mit Hilfe eines Kniehebels eingestellt werden. Dazu ist ein Griff (45.4) vorgesehen. Bei hochgeschwenktem Arretierchwenkhebel (51) kann durch Druck auf die Rückenlehne (16) eine Verschwenkung um die Schwenkachse (23) mit Abneigung der Fläche des Sitzes (15) vorgenommen werden, wobei der vordere abgerundete Sitzbereich (15.6) seine Höhenlage beibehält.

In summary, the invention can also be described as follows:

• The work chair (10) has a seat (15) divided into a front seat part (15.1) and a rear seat part (15.3), the front seat frame part (17.1) and the rear seat and back part (17.2) of which are connected to an articulated axis (18) by joints . The rabbet parts are supported on a base frame (11) with seat frame supports (20, 21). A column support part (25) is provided on the column (13), which supports the pivot axis (23) and a pivot support part (28). The seat rack supports (21) are attached to the pivot bracket (23). The pivoting support part (28) can be pivoted with the aid of an inclination adjustment device with an actuating bracket (67) for pivoting the plane (E). The swivel support part (28) asked Langlocblager in the front, in which the Scbiebeacbse (22) can be moved against the force of an adjustable spring. The slide axis (22) carries the seat frame supports (20). The Sliding axis (22) can be secured against displacement with a locking device via a locking pivot lever (51) with a pivot rod (52). The spring force can be adjusted using a toggle lever. A handle (45.4) is provided for this. When the locking swivel lever (51) is swiveled up, pressure on the backrest (16) can be swiveled around the swivel axis (23) with inclination of the surface of the seat (15), the front rounded seat area (15.6) maintaining its height.

Reference symbol list

• Work chair
• Base
• 12 roll
• 13 pillar
• 14 body support
• 15 seat
• 15.1 front seat part
• 15.3 rear seat part
• 15.6 front rounding
• 16 backrest
• 16.4 upper backrest part
• 17 frames
• 17.1 Front seat frame part
• 17.2 rear seat and
• Back frame part
• 17.3 Rear seat frame part
• 17.4 Back frame part
• 18 jelly salmon
• 13.1 joint
• 18.2 joint
• 20 seat frame supports
• 20.1 Seat frame support
• 20.1 Seat frame support
• 21 seat frame supports
• 21.1 Seat frame support
• 21.2 Seat frame support
• 22 Sliding axis / axis
• 23 Sliding axis / axis
• 23.1 support axis
• 23.2 Axle tube
• 25 column support
• 25.1 Column support leg
• 25.2 Column support leg
• 25.3 partially cylindrical
• Connection area
• 26 support tube
• 28 swivel support part
• 28.1 support leg
• 28.2 support leg
• 28.3 connecting bridge
• 28.5 rear storage area
• 28.6 rear Zagerbereici
• 28.7 Front area
• 28.8 Front area
• ₂₈ .9 upper corner area
• 29 swivel bearings
• 29.1 Swivel bearing
• 29.2 Swivel bearing
• 31 slot
• 31.1 slot
• 31.2 slot
• 32 sliding bearings
• 32.1 Sliding bearing
• 32.2 Sliding bearing
• 32.3 Boundary collar
• 32.4 boundary collar
• 35. Toggle housing
• 35.1 Toggle housing side wall
• 35.2 Toggle housing side wall.
• 35.3 rear spring support wall
• 35.4 lower housing wall
• 36 guide pin
• 37 spring counter bearing part
• 37.1 shaft
• 37.2 Guide hole
• 37.4 Support area
• 37.5 System component cylinder
• 38 compression spring
• 41 support pin
• 42 toggle lever
• 43 knee element
• 44 front toggle
• 44.1 Part cylinder contact element
• 45 set screw
• 45.1 shaft
• 45.3 head
• 45.4 handle
• 46 Stroke limitation
• 47 slot
• 48 washer
• 50 locking device
• 50.0 locking lever
• 51.1 disc-shaped arm
• 51.2 disc-shaped arm
• 51.3 Locking bar
• 51.4 Bore bore
• 51.5 Locking
• 51.6 Locking
• 51.9 support surface
• 52 swivel rod
• 52.1 Handle
• 55 support area
• 60 inclination adjustment
• Facility
• 61.1 Tilt cam
• 61.2 Tilt cam
• 61.3 Curve slot
• 61.4 Curve slot
• 61.5 operating arm
• 61.6 operating arm
• 61.7 Spring support
• 61.8 Spring support
• 62 bearing nut
• 63 bearing screw
• 64 axis of rotation
• 65 dowel pin
• 66.1 detent spring
• 66.2 detent spring
• 67 operating bracket
• 67.1 side arm
• 67.2 side arm
• 67.3 Locking projection
• 67.4 Locking projection
• 68 recess
• 70 end of actuation
• 71 operating lever
• 72 bearing bore
• 72.1 Bearing bore
• 72.2 Bearing bore
• 73 Swivel limitation
• H stroke
• E level

Claims (24)

1. Working chair (10) with - Seat (15) and - Backrest (16) as well - base frame (11) with - - Support and adjustment mechanism, whereby - The seat (15) is divided into a front seat part (15.1) and a rear seat part (15.3), which - Articulated (18) are interconnected, and - The backrest (16) with the rear seat part (15.3) is largely non-changeable and - The seat parts (15.1, 15.3) on the fixed articulated axes (22; 23) and - Are supported movably against spring force (38) in their relative angular position, wherein - The rear seat part (15.3) is supported on a frame-fixed joint axis (23) lying under the hinge axis (18) of the seat surface parts (15.1, 15.3) such that it rests from the foremost stop position of the spring-loaded support when pressure is applied to the backrest (16) tilts back down
characterized in that - The two hingedly coupled seat parts (15.1, 15.3) are each supported by only one support (20; 21) or a pair of supports (20.1, 20.2; 21.1, 21.2) and - The front seat part (15.1) near the front end (15.6) of the seat (15) has its articulated axis (sliding axis 22), - The hinge axis (pivot axis 23) of the rear seat part (15. ₃ ) behind the hinge axis (sliding axis 22) of the front seat part (15.1) and - One of the frame-fixed joint axes (22, 23) is arranged movably against the force of a spring (compression spring 38). 2. work chair according to claim 1,
characterized,
that the seat parts (15.1, 15.3) are formed with the help of two articulated frame parts (17.1; 17.3, 17.2) or frame-like shell parts, under which seat frame supports (20.1, 20.2; 21.1; 21.2) projecting downwards and inwards are fastened, which have fastening sleeves that can be plugged onto the joint axes (sliding axis 22 and pivot axis 23). 3. work chair according to claim 1 or 2,
characterized,
that the frame-fixed hinge axis (swivel axis 23) lies directly in front of the column (13) of the base frame (11) and the hinge axis (18) of the seat parts (15.1, 15.3) between the through the vertical column (13/26) and the swivel axis (23 ) vertical and parallel planes. 4. work chair according to at least one of the preceding claims,
characterized,
that the plane (E), in which the two joint axes of the support (sliding axis 22 and pivot axis 23) lie and the seat frame plane or main seat plane in the front spring stop position enclose an acute angle of a few degrees with one another. 5. work chair according to at least one of the preceding claims,
characterized,
that the position of the articulated axes (18, 22, 23) and the length of the levers is selected such that the front seat part (15.1) has an angular range of approximately 3 ° when pivoted against the force of the spring (38) and the backrest (16 ) cover an angular range of approximately 16 °. 6. work chair according to at least one of the preceding claims,
characterized,
that the pivot axis (23) provided on the column support part (25) is non-displaceable and the articulated axis (sliding axis 22) mounted on the pivot support part (28) can be displaced backwards against spring force (38). 7. work chair according to at least one of the preceding claims,
characterized,
that the seat frame supports (20, 21) are designed to protrude far below the edge of the seat (15), while the supports of the articulated axes (pivot axis 23 and sliding axis 22) in the vicinity of the column (13) are rotatably connected to the support tube (26 ) the column (13) connected rotary and sliding bearings (29, 32) are formed. Working chair (10) with Seat (15) and - Backrest (16) as well - Base (11) with - Support and adjustment mechanism, whereby Seat (15) and backrest (16) on articulated axles (22, 23) and - are supported movably in their angular position against spring force (38), - In particular according to one of claims 1 to 7, characterized in that - Seat (15) and backrest (16) are supported on the base frame (11) by only two supports (20, 22; 21, 23) or two pairs of supports (22, 20.1, 20.2; 23, 21.1, 21.2) , - whose one support articulated axis (pivot axis 23) is attached to the part of the support and adjustment mechanism (column support part 25) which is firmly connected to the base frame and - The other hinge axis (sliding axis 22) is mounted on a swivel support part (28), - Which in turn is pivotally mounted on the first-mentioned, on the base frame (11) fixed hinge axis (pivot axis 23), and - An inclination adjustment device (60) is arranged between the column support part (25) fixed to the base frame (11) and the swivel support part (28), by means of which the relative height position of the articulated axis (pivot axis 22) mounted pivotably relative to the articulated axis fixed to the base frame (11) Pivot axis 23) is changeable. 9. work chair according to claim 8,
characterized in that the inclination adjustment device (60) is formed with the aid of at least one tilt cam disc (61) pivotably mounted about an axis of rotation (64) provided on one of the mutually adjustable support parts (column support part 25 and swivel support part 28), to which an attached to the other support part Curve support part (coupling pin 65) engages and an adjusting handle (actuating bracket 67) and locking means (67.3, 67.4, 68, 66, 67) are provided. ₁ 0. work chair according to claim 8 or 9,
characterized in that the column support part (25) has two arm-shaped column support legs (25.1 and 25.2) which surround the space for the spring (38) and the like on the outside and which in the area of their front ends have outward-pointing coupling pins (65) have, which engage in the cam slots (61.3, 61.4) of the inclination cams (61.1, 61.2), which in particular rest only with play on the outer surfaces and inside the support legs (28.1, overlapping the column support legs (25) and the inclination cams (61) 28.2) of a U-shaped, all other components of the carrying and adjusting mechanism swivel support part (28) are arranged and are articulated with the help of a preferably in individual bearings (62, 63) divided axis of rotation (64). 11. _Arbe itsstuhl to at least one-of-Ansprüche.8 to 10, characterized in that
that the support legs (28.1, 28.2) have locking recesses (68) which are recessed in a part-circle around the axis of rotation (64) in the lower edges of the support legs (28.1, 28.2) and into which the locking projections (67.3, 67.4) one of the two inclination cams ( 61.1, 61.2) engage the actuating bracket (67). 12 work chair (10) with - Seat (15) and - Backrest (16) as well - Base (11) with - Support and adjustment mechanism, whereby - The seat (15) and backrest (16) are divided into at least two articulated (18) sections (15.1, 15.3, 16) and - The sections (15.1, 15.3) are supported with separate support levers (20, 21), between which and / or the support elements (25, 28) fixed to the frame, at least one spring (38) is arranged, - Which is equipped with a force changing the spring (38) adjusting device, in particular according to one of the preceding claims, characterized in that the spring force adjusting device is formed with an angularly adjustable toggle lever (42, 43, 44) which in Knee joint has a knee element (43) which is adjustable by means of an adjusting screw (45) supported on a knee lever support element (knee lever housing 35). 13. Working chair according to claim 12,
characterized,
that the toggle lever arrangement in the axial direction of a compression spring (38) is clamped together with the latter in the plane (E) of the two joint axes (pivot axis 23 and sliding axis 22). ₁ 4. work chair according to claim 12 or 13,
characterized,
that the toggle lever arrangement is arranged in a box-like toggle lever housing (35) which is open towards the front and up and which in turn supports the adjusting screw (45) acting on the knee element (43), the abutment (41) and a spring bearing (rear spring support wall 35.3). 15. work chair according to at least one of claims 12 to 14,
characterized,
that the spring support wall (35.3) of the toggle lever housing (35) carries in the plane (E) having the directions of pressure forces a guide pin (36) on which a spring counter bearing part (37) is displaceable, which the compression spring (38) between its support area (37.4) and the spring support wall (35.5) holds and centers. 16. Working chair according to at least one of claims 12 to 15,
characterized,
that the spring counter bearing part ( ₃₇ ) has a contact part cylinder (37.5) for support on the hinge axis (23) _b between its axle tube (23.2). 17. Working chair according to at least one of claims 12 to 16,
characterized,
that the front toggle lever (44) facing the sliding axis (22) has a partial cylinder contact element (44.1) which is supported directly on the sliding axis (22). 18. Working chair according to at least one of claims 12 to 17,
characterized,
that the toggle lever parts are formed by double-armed, interlocking toggle lever elements (42, 44), the rear of which is supported in the toggle lever housing side walls (35.1, 35.2) with the aid of a support pin (41). 19. Work chair according to at least one of the preceding claims,
characterized,
that the sliding axis (22) or the suspension device is equipped with a locking device (50) which prevents the displacement movement. 20. work chair according to claim 19,
characterized,
that the locking device (50) is formed with a locking pivot lever (51) which can be pivoted about the sliding axis (22) and which, in the locking position, is approximately in the plane (E) connecting the axes to housing parts (38.1, 38.2) of the pivoting support part which has the longitudinal sliding bearing ( ₂₈ ) is supported and its locking ends (51.5, 51.6) can be pivoted from the locking position into a position parallel to the sliding plane (E) by approximately 90 °. Working chair according to claim 19 or 20,
characterized in that the locking device (50) has two disc-shaped arms (51.1, 51.2) which are arranged outside the toggle lever housing (35), including the latter, and on the outside of which the limiting collars (32.3, 32.4) of the sliding bearings (32) for mutual purposes Position fix. 22. Working chair according to claim 21,
characterized in that the disc-shaped arms (51.1, 51.2) are connected by a locking web (51.3), the locking ends (51.5, 51.6) of which protrude beyond the disc-shaped arms (51.1, 51.2) and in the region of the support legs (28.1, 28.2) of the pivoting support part (28) and the locking pivot lever (51) has a pivot rod (52) with a handle (52.1), which is preferably located laterally below the front area (15.6) of the seat (15). 23. Working chair (10) with - Seat (15) and - Backrest (16) as well - Base (11) with - Support and adjustment mechanism, whereby - Seat (15) and backrest (16) are divided into at least two parts (15.1, 15.3, 16) which are articulated to one another, - which are supported by means of levers or arms (seat frame supports 20, 21) supporting the seat and backrest parts, on the support and adjustment mechanism components,
in particular according to one of the preceding claims, characterized in that different support and adjustment elements of several, partially open, U-shaped, with their inner spacing on the respective outer spacing of the other nested support and adjusting housing parts (28, 28.1, 28.2; 25 , 25.1, 25.2; 35) are formed. 24. Work chair according to claim 23, characterized in that the swivel support part (28) is designed as a downwardly open, U-shaped bearing part, the swivel bearing (29.1, 29.2) and the sliding bearing (32.1, 32.2) receiving end regions (28.5 to 28.8 ) are designed to protrude freely beyond the middle connecting web (28.3).

Images