EP0205097B1 - Arbeitsstuhl - Google Patents

Arbeitsstuhl Download PDF

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Publication number
EP0205097B1
EP0205097B1 EP86107629A EP86107629A EP0205097B1 EP 0205097 B1 EP0205097 B1 EP 0205097B1 EP 86107629 A EP86107629 A EP 86107629A EP 86107629 A EP86107629 A EP 86107629A EP 0205097 B1 EP0205097 B1 EP 0205097B1
Authority
EP
European Patent Office
Prior art keywords
seat
support
axis
spring
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86107629A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0205097A3 (en
EP0205097A2 (de
Inventor
Heinz-Peter Suhr
Bernd Weinberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
August Froscher & Co KG GmbH
August Froscher GmbH and Co KG
Original Assignee
August Froscher & Co KG GmbH
August Froscher GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by August Froscher & Co KG GmbH, August Froscher GmbH and Co KG filed Critical August Froscher & Co KG GmbH
Priority to AT86107629T priority Critical patent/ATE47289T1/de
Publication of EP0205097A2 publication Critical patent/EP0205097A2/de
Publication of EP0205097A3 publication Critical patent/EP0205097A3/de
Application granted granted Critical
Publication of EP0205097B1 publication Critical patent/EP0205097B1/de
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs

Definitions

  • 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 subdivided into at least two parts which are connected to one another in an articulated manner and which are supported on the support and adjustment mechanism components by means of levers or arms which support seat and backrest parts are supported.
  • the seat and backrest are z. T. divided into several sections and connected to each other in an articulated and / or adjustable manner. Since the user very often has to change his seating position during the day, the chair mechanics should also be designed in such a way that it automatically adapts to its respective needs and functions in at least some areas.
  • the back 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 seating positions should be easy to take up and optimal support should be provided for the respective body parts.
  • an articulated connection between the seat and backrest is provided, such as, for example, according to DE-OS 3 322 450 or DE-OS 3 036 993, wherein in the first case an articulated lever construction with a fixed articulated axis and in the second case a bendable connection between seat and backrest is selected 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.
  • the backrest has no contact with the backrest in the inclined handwriting position. 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.
  • the basic structure of such a construction is known from DE-GM 7 721 954.
  • 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.
  • the wedge part and backrest can be firmly connected to one another or 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 passes underneath the other hinge axis and on which the wedge part is fixed.
  • 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.
  • 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.
  • DE-GM 7 721 954 is also still lacking a training which enables prolonged sitting in the forward-bent hand writing position, in which the seat surface is inclined slightly downwards at the front. It is therefore not fully adapted to the practical needs, for which it is important that the seat and backrest be different for the different positions of use educated and working in different ways to optimally adapt.
  • a device for adjusting the seat angle on chairs 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 how you can implement a suitable inclination adjustment with an inclination cam and an articulated axis, in which the curve formation also includes the detent.
  • this version is not suitable for direct application to 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, which 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.
  • the patent / the patent application treats a group of inventions or inventive features according to the legal uniformity requirements or according to Art. 82 of the European Patent Convention, which are interconnected in such a way that they realize a single general inventive idea which
  • 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 levers to form suitable simple kinematics, and the inclination adjustment of the joints the and the spring-loaded support of the mutually movable parts, if necessary with locking and possibly in a compact, stable, inexpensive and nested design of the support and adjustment mechanism, these parts all interacting as a whole, but in their individual sub-areas both can be subject
  • 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 largely unchangeable and the seat surface parts are pivotally supported on frame-fixed joint axes and are movably supported in their relative angular position against spring force, the rear seat surface part being supported on a frame-fixed joint axis lying under the joint axis of the seat surface parts such that it rests from the foremost stop position of the spring-loaded support when pressure on the backrest tends backwards downwards, the special feature according to the invention is that the two seat parts which are coupled to one another in an articulated manner have only one support or a few supports on the foot are supported on the frame and the front seat part near the front end of the seat has its frame-fixed hinge axis, the hinge axis of the rear seat part lies behind the hinge axis of the front seat surface part and one of the frame-
  • 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 extended onto the joint axes.
  • 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.
  • the articulated axes and the support on the base frame are close together in this area and thus enable the favorable transfer of forces and, above all, the particularly favorable sequence of movements of the rear seat part, which begins from a position that is already slightly tilted backwards relative to the top dead center position swivel when the backrest is tilted back.
  • the plane in which the two hinge axes of the support lie and the seat frame plane or the main seat plane level expediently enclose an acute angle of a few degrees in the front spring stop position.
  • the position of the articulated axes and the length of the levers are expediently chosen such that the front seat part covers an angular range of 3 ° when pivoting against spring force and the backrest covers an angular range of approximately 16 °. 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.
  • the sliding axis can be provided in the area of the base frame if the other design is chosen accordingly.
  • the pivot axis provided on the column support part is non-displaceable and the front joint axis mounted on the pivot support part is designed to be displaceable backwards against spring force.
  • the rear axle, which supports the entire rest of the joint is solid and does not tip, and the front axle is available as a sliding axle, which does not affect stability.
  • An important 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.
  • 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 provided cheaply 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.
  • a work chair with a seat and backrest and a base frame with support and adjustment mechanism, with seat and backrest are movably supported in their angular position on frame-fixed articulated axes and against spring force, which has the particular feature that the seat and backrest are supported on only two supports or two pairs of supports on the base frame, one of which has a support articulated axis (swivel axis) on the part of the support and adjustment mechanism (column support part) which is firmly connected to the base frame and is fastened and the other articulation axis is mounted on a swivel support part which in turn is pivotably mounted on the first articulated axis (swivel axis) which is fixed to the base frame and between which is fixed on the base frame
  • Column support and a tilt adjustment device is arranged on the pivot support part, by means of which the The relative height of the pivotable pivot
  • 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 which an articulated axis is used simultaneously to support the seat part and to support the supporting part, thereby reducing the number of components and improving the clarity of the construction and kinematics, without having to take the inclination adjustment into account in the special design of the kinematics in special 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.
  • it is of particular importance to provide a basic inclination adjustment because this simplifies the starting position with simple means, especially for the bent paperwork posture and the adaptation to other user needs.
  • 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 an axis of rotation 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.
  • 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.
  • 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 in the cam slots of the inclination cams, which in turn rest only with play on the outer surfaces and inside the support legs of a U-shaped swivel support part that overlaps the column support legs and the inclination cam disks, all other components of the support and adjustment mechanism being located, the inclination cam disks using a, preferably divided into individual bearings, the axis of rotation are mounted on the swivel support part.
  • 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.
  • 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 is therefore also used only in a sub-combination with partial features of the above-mentioned main and secondary claims can be because it is suitable for a variety of chair spring settings with different kinematic conditions.
  • 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 A 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 knee lever, which has a knee element in the knee joint, which by means of a knee lever support element ( Toggle lever housing) supported adjusting screw is adjustable.
  • 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.
  • the toggle lever arrangement can expediently be arranged in a box-like toggle lever housing which is open towards the front and upwards and which in turn supports the adjusting screw acting on the knee element and, on the other hand, the abutment of the toggle lever and also a spring bearing.
  • a box-like element can also be conveniently arranged in the housing of the support and adjustment mechanism, which is also designed with parallel walls, and offers favorable manufacturing and connection conditions for the other 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.
  • 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.
  • the spring-loaded deflection of the backrest and the lowering of the seat are not desirable. It is therefore expedient to make the displacement and suspension options switchable or lockable.
  • 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.
  • the locking device is formed with a locking pivoting lever which can be pivoted about the sliding axis and which is supported in the locking position approximately in the plane connecting the axes on housing parts of the pivoting support part having the longitudinal sliding bearing and with its locking members from the locking position in a position parallel to the sliding plane can be pivoted by approximately 90 °.
  • 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.
  • 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 Support and adjustment mechanism components are supported, the special feature that different support and adjustment elements are formed by several partially open, U-shaped in their inner distance to the respective outer distance of the other nested support and adjustment housing parts.
  • the swivel support part can be designed as a downwardly open, U-shaped bearing part, the end regions of which receive the swivel bearings and the sliding bearings are designed to project freely beyond the central connecting web.
  • the work chair 10 has a five-arm base 11, with conventional rollers 12 and a height-adjustable column 13 and a body support 14 with seat 1 and backrest 16, which are attached and supported on a frame 17 in a manner described below.
  • 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 humps. There is a peculiarity 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 supported on the axles 22 and 23 by two seat frame supports 20 and 21, respectively.
  • 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 sliding axis 22 is mounted in a swivel support part 28, which is designed as an outer, downwardly open U-profile-shaped support part with two support legs 28.1 and 28.2 and a connecting web 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 swivel bearing 29.1 and 29.2, which is rotatably and appropriately attached to the axle tube 23.2 from the two outer sides and into which from FIGS. 3, 5 and 8 in their shape visible profiled bearing recesses 30 fits.
  • 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.
  • a guide pin 36 is attached, 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 in particular from 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 support pin 41, which in turn is articulated to the knee element 43.
  • the front double-armed toggle lever 44 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.
  • 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.
  • a washer 48 Under the head 45.3 of the adjusting screw 45 there is a washer 48 which enables the adjusting screw 45 to slide during the adjustment.
  • the distance between the support pin 41 and the pivot axis 22 can be changed by turning the adjusting screw 45, which is provided with a suitably large handle 45.4, which is omitted in FIG. 7.
  • the spring 38 is biased more or less.
  • the toggle lever arrangement offers the particular advantage that it can be adjusted more easily with increasing spring tension, which naturally increases progressively, because the toggle lever assumes a more extended position.
  • a spring locking device 50 is provided.
  • 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 51.4. As a front connection, they have a locking web 51.3, which is inserted into corresponding recesses and welded to the disk-shaped arms 51.1 and 51.2.
  • 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 areas 28.7 and 28.8 in the upper corner area 28.9 with a quarter circle, the center of which is the center point of the front semicircle of the elongated bearing hole and which has a somewhat smaller radius than the distance between the support surface 51.9, the detent 51.5 and 51.6 from the center of the sliding axis 22.
  • the downward-reaching support area 53 is approximately tangential, so that the locking members 51.5 and 51.6 can lie there and, as can be seen, prevent displacement of the sliding axis 22.
  • the sliding axis 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, the locking members 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 from FIGS. 3, 8 and 9. These are in turn pivotally fastened with bearing nuts 62 and bearing screws 63 as an axis of rotation 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 axis of rotation 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 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 locking recesses 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, as shown in FIG. 5 shows, and arranged in a partial circle, so that the inclination cam 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 can be changed over a wide range to adjust the seat and backrest output inclination.
  • actuation end 70 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.
  • 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 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.
  • the initial inclination of the seat 15 and the backrest 16 is adjusted.
  • the actuating bracket 67 is pulled downward against the force of the springs 66, so that the locking projections 67.3 and 67.4 leave the locking recesses 68.
  • 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 is comfortable for most uses of the chair in the non-reclined position. This means that a user who writes a great deal by hand will choose an inclination in which the seat, not as shown in FIG.
  • the toggle lever is stretched more or less and the prestress of the spring 38 is thereby set.
  • 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.
  • the rear seat part 15.3 and backrest 16 pivot about 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» is to be understood. 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.
  • 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.
  • the coupled front seat part 15.1 is taken along with the front seat frame part 17.1 and pivoted about the sliding axis 22, which, because of the fixed coupling and rigid design in the elongated hole 31.1 and its associated sliding bearing 32, is pivoted slightly and displaced to the rear, so that also the front seat frame part 17.1 occupies a slightly downward inclined position, which is, however, less inclined than the inclination of the rear seat frame part 17.3, because it is equipped further forward and has a long coupling lever arm in the front seat frame part 17.1 and is carried accordingly.
  • 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.
  • the front seating area with the rounded portion 15.6 practically retains its height.
  • 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, whereby the hinge 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.
  • 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.
  • an angular range of approximately 16 ° is expedient. This ratio of about 1: 5 would in itself cause an excessive angle inclination between the thighs and back. Due to the elastic design of seat shells or other support elements of the upholstery, however, there is a compensation of the entire seat inclination, so that overall an angular ratio of approximately 1: 3 is achieved in the extremely pivoted-back position.
  • 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.
  • seat frame supports instead of such paired seat frame supports, one can also provide one-piece seat frame supports which are articulated accordingly.
  • the alternatives in the claims are to be understood, where it says only one support or a pair of supports.
  • 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.
  • pivotable parts namely the support of the seat frame supports 21.1, 21.2 and thus the rear seat part and the back
  • the work chair (10) has a seat (15) which is 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 frame part (17.2) are connected to a joint axis (18) by joints .
  • the frame parts are supported on a base frame (11) by 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 frame supports (21) are attached to the pivot axis (23).
  • the swivel support part (28) can be swiveled with the aid of an inclination adjustment device with an actuating bracket (67) for swiveling the plane (E).
  • the swivel support part (28) has elongated hole bearings at the front, in which the sliding axis (22) can be displaced against the force of an adjustable spring.
  • the sliding axis (22) carries the seat frame support (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.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Seats For Vehicles (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP86107629A 1985-06-14 1986-06-05 Arbeitsstuhl Expired EP0205097B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86107629T ATE47289T1 (de) 1985-06-14 1986-06-05 Arbeitsstuhl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853521488 DE3521488A1 (de) 1985-06-14 1985-06-14 Arbeitsstuhl
DE3521488 1985-06-14

Publications (3)

Publication Number Publication Date
EP0205097A2 EP0205097A2 (de) 1986-12-17
EP0205097A3 EP0205097A3 (en) 1987-09-02
EP0205097B1 true EP0205097B1 (de) 1989-10-18

Family

ID=6273360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107629A Expired EP0205097B1 (de) 1985-06-14 1986-06-05 Arbeitsstuhl

Country Status (7)

Country Link
US (1) US4695093A (ja)
EP (1) EP0205097B1 (ja)
JP (1) JPH0734772B2 (ja)
AT (1) ATE47289T1 (ja)
AU (1) AU5855286A (ja)
DE (2) DE3521488A1 (ja)
ZA (1) ZA864324B (ja)

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Also Published As

Publication number Publication date
AU5855286A (en) 1986-12-18
JPH0734772B2 (ja) 1995-04-19
US4695093A (en) 1987-09-22
DE3666330D1 (en) 1989-11-23
DE3521488A1 (de) 1986-12-18
EP0205097A3 (en) 1987-09-02
EP0205097A2 (de) 1986-12-17
ZA864324B (en) 1987-02-25
JPS6257519A (ja) 1987-03-13
ATE47289T1 (de) 1989-11-15

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