EP0341344B1 - Sitting furniture - Google Patents

Sitting furniture Download PDF

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Publication number
EP0341344B1
EP0341344B1 EP88120948A EP88120948A EP0341344B1 EP 0341344 B1 EP0341344 B1 EP 0341344B1 EP 88120948 A EP88120948 A EP 88120948A EP 88120948 A EP88120948 A EP 88120948A EP 0341344 B1 EP0341344 B1 EP 0341344B1
Authority
EP
European Patent Office
Prior art keywords
seat
spring
item
seating furniture
back rest
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 - Lifetime
Application number
EP88120948A
Other languages
German (de)
French (fr)
Other versions
EP0341344A3 (en
EP0341344A2 (en
Inventor
F.-Martin Streifensand
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.)
F-Martin Steifensand Firma
Original Assignee
F-Martin Steifensand Firma
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 F-Martin Steifensand Firma filed Critical F-Martin Steifensand Firma
Publication of EP0341344A2 publication Critical patent/EP0341344A2/en
Publication of EP0341344A3 publication Critical patent/EP0341344A3/en
Application granted granted Critical
Publication of EP0341344B1 publication Critical patent/EP0341344B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/445—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs
    • A47C7/4454—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs of torsion type
    • 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
    • A47C1/03277—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs
    • A47C1/03279—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs of torsion type
    • 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
    • A47C1/03283—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with fluid springs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/021—Rocking chairs having elastic frames
    • A47C3/023—Rocking chairs having elastic frames made of tubular material
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/024—Seat parts with double seats

Definitions

  • the invention relates to seating furniture according to the preamble of patent claim 1.
  • a piece of seating furniture which has a base frame with a fixed base frame block, a seat support and a backrest support.
  • the seat support is pivotably articulated on the foot frame block about an axis running horizontally and transversely to the direction of view of a person sitting on the seating furniture, while the backrest support is articulated with the foot frame block and the seat support about second and third axes running parallel to the aforementioned first axis connected is.
  • the devices for synchronously coupled pivoting of the seat support and backrest support consist of the various articulated connections between the base frame, seat support and backrest support and are otherwise designed in such a way that the pivoting of the seat support and backrest support relative to the foot support block takes place in a common direction , however, the backrest support passes through a larger swivel angle than the seat support.
  • the Swiveling from the working position downwards / backwards into the rest position by the body weight on the other hand the swiveling upwards / forwards from the rest position by means of an energy store, e.g. B. in the form of a gas spring, which is located below the seat support and is supported between the base block and backrest support.
  • the first articulation axis of the seat support on the base frame block, the second articulation axis of the backrest support on the base frame block and the third articulation axis of the backrest support on the seat support lie approximately in a straight line or at least in the lateral areas of a middle straight line that the circular arcs of the swivel radii of the seat support and backrest support differ only slightly from one another on the third articulation axis, the first articulation of the front seat support area on the base frame block without play, the third articulation of the rear seat support end on the backrest support being designed with play.
  • the seat support and backrest support are relatively complicated and have a large number of individual components, for their assembly a correspondingly large number of screw connections, screw bolts, rivet connections and the like. Like. More is required.
  • a piece of seating furniture with the features of the preamble of claim 1 has also become known, in which a hinge element with a horizontal hinge axis is arranged on the seat support, about which the lower part of the backrest rotates in such a way that the backrest follows can give way in the back and also carries a support arm for the seat plate. This results in a synchronous movement between the seat plate and the backrest.
  • a helical spring provided in the seat support, the tension of which is adjustable, and a gas spring cause an uplifting force of the seat plate and backrest.
  • the present invention has for its object to provide an improved seating with the features of the preamble of claim 1, which is constructed much simpler compared to the prior art and thus less expensive to manufacture, which also has practical uses in its application accommodates much better and in which, above all, the pivoting movements of the seat and backrest for the person sitting on the seating furniture can be realized in a much more physically appropriate manner.
  • the aforementioned object is achieved according to the invention in that the seat support is rigid, ie. H. is pivotally fixed to the base frame and that in each case articulation connections are provided between the seat support and the seat on the one hand and between the seat support and the backrest on the other hand, which are formed by torsionally elastic connecting elements.
  • the torsionally elastic connecting elements consist of torsion spring elements which can be subjected to both bending and torsion and which serve as energy stores.
  • Such torsion spring elements can preferably be designed in the form of bow springs, which are preferably made of spring steel bars (claim 3).
  • the two torsionally elastic connecting elements are impressed with spring preloads which are directed in opposite directions.
  • the different spring preloads that are actually required are selected in particular in accordance with the restoring forces that are required for pivoting from the rest position into the working position of the seating furniture.
  • the one torsionally elastic connecting element which is arranged between the seat support and the seat or the seat frame, has a preload which is set in such a way that corresponds to a seat orientation or seat inclination in which the front seat region is the most downward or the rear one Seating area is raised the highest.
  • the second, torsionally elastic connecting element arranged between the seat support and the backrest or the backrest frame has an oppositely directed spring preload which corresponds to an orientation or inclination of the rear seat area and the backrest and thus a pivoting position, in which the rear seat area is raised the largest and the backrest is pivoted forward the most.
  • At least one of the spring preloads of the two torsionally elastic connecting elements is changeable or adjustable.
  • any pivoting position of the seat and backrest can be adjusted practically continuously, the desired pivoting position achieved in each case being lockable by actuating the gas spring.
  • Claims 7 and 8 deal with preferred configurations and arrangements of the two torsionally elastic connecting elements.
  • claims 9 and 10 relate to a favorable design of the seat support and its arrangement within the framework of the overall construction of the seating.
  • Claims 11 and 12 relate to an advantageous arrangement and design of an adjustment mechanism, with the aid of which the desired spring preload of one of the two torsionally elastic connecting elements can be varied.
  • FIG. 1 shows the side view of an office chair which has a base frame 1 which i. w. consists of a tube, a support column 2, for example designed as a gas spring, is arranged in the interior of the base frame 1 and carries at its upper end a conical pin 3 which is inserted into a corresponding sleeve 4 connected to a seat support 5.
  • a base frame 1 which i. w. consists of a tube
  • a support column 2 for example designed as a gas spring
  • the lower end of the support column 2 of the base frame 1 is mounted on rollers (not shown here).
  • the seat support 5 with the sleeve 4 and with the outer tube of the base frame 1 is fixed and i. w. pivotally connected and welded, for example, to the upper end of the base frame 1.
  • the seat support 5 can be seen in detail from FIG. 2. It consists i. w. from a U-shaped tube 6 with two legs 8, between which a plate 7 is arranged, which is laterally firmly connected to the legs 8 and to the arcuate region of the U-tube 6.
  • the plate 7, as can be seen again from FIG. 1, is firmly connected to the upper ends of the sleeve 4 and the outer tube of the base frame 1, for example by appropriate welded connections, the seat support 5 starting from the base frame 1 having an inclination , which is directed obliquely upwards towards the front end of the seat.
  • the office chair i. w. a seat 43 with a seat frame 28 and a backrest 45 with a backrest frame 36, which has a lower backrest frame part 29, by which a lower region 44 of the backrest 45 is defined.
  • This lower backrest area 44 practically also functions as a rear seating area, while the seat 43 practically forms the front seating area (cf. also FIG. 6).
  • the seat frame 28 has two lateral, iw parallel first and second legs 28a and 28b, which are each connected via first and second swivel joints 30a and 30b to adjoining first and second legs 29a and 29b of the lower backrest frame part 29 of the backrest frame 36, whereby pivoting movements of the seat frame 28 and backrest frame 36 relative to one another are made possible .
  • FIG. 1 The upper, i. w. part of the office chair consisting of the backrest 45 and armrests 38 has not been shown in FIG. 1 for reasons of space. In this regard, reference is made to FIG. 6.
  • the two armrests 38 each extending from the seat frame 28 to the backrest frame 36 are provided with flexible or flexible kinks in order to be able to participate in the relative pivoting movements of the seat frame 28 and the backrest frame 38, the armrests 38 with their respective ends via correspondingly arranged swivel joints 39 are connected to both the seat frame 28 and the backrest frame 36.
  • Such swivel joints 39 are shown schematically in FIGS. 1 and 6, for example, which are the articulated connections of the armrests 38 with the two first and second legs 28a and 28b of the seat frame 28 and with the two first and second legs 29a and 29b of the lower backrest frame part 29 is.
  • the seat support 5 is connected to the legs 28a and 28b of the seat frame 28 via a first bow spring 9. Furthermore, the seat support 5 is via a second bow spring 15 connected to the legs 29a and 29b of the lower backrest frame part 29 of the backrest frame 36.
  • first and second bow springs 9 and 15 each provide torsionally flexible articulated connections between the seat support 5 and the seat frame 28 (and thus the seat 43) on the one hand and between the seat support 5 and the lower backrest frame part 29 (and thus also the backrest 45) on the other hand , wherein these two bow springs 9 and 15, which are preferably made of spring steel and have opposite spring preloads, each represent torsion spring elements which are subjected to both bending and torsion when the seat 43 and backrest 45 are pivoted with the lower backrest region in a synchronously coupled manner, as already explained in more detail at the beginning.
  • the free ends 10 are the Bow spring 9 each bent parallel to the two legs 28a and 28b of the seat frame 28, while on these legs 28a and 28b each have a holding element 11, for. B. in the form of a receptacle, which is used to attach a free end 10 of the bow spring 9.
  • these free ends 10 of the first bow spring 9 each extend from sections 9a and 9b which are bent at right angles to the ends of the seat support 5 pointing towards the front end of the seat.
  • the bow spring 9 continues in a curved middle part 13 pointing towards the rear seat support region, which is, for example, horseshoe-shaped and movable relative to the seat support 5, the rearmost section of the curved middle part 13 being mounted in a sleeve 14 .
  • the plate 7 of the seat support 5 has approximately in its central region an opening 14 ', which is arranged exactly at the level of the rear portion or rear end of the curved central part 13 and an adjustment mechanism to be explained below for adjusting the bias of the first bow spring 9 is.
  • the second bow spring 15 with a bias towards the bias of the first bow spring 9 is designed in such a way that it has two free ends 16, which run parallel to the two legs 29a and 29b of the lower backrest frame part 29 and which are used to make the connections with serve the lower backrest frame part 29 and thus simultaneously with the backrest frame 36.
  • the two first and second legs 29a and 29b of the lower backrest frame part 29 are connected to one another by an intermediate frame part 31, which carries in its center a sleeve-shaped fastening element 32, which supports an upper end 33 'A gas spring 33 is used, as can be seen in particular from FIGS. 1 and 7.
  • this gas spring 33 which can be actuated with the aid of an associated operating lever 35, is supported with its lower end 33 ⁇ on an arm 34 of the base frame 1 directed towards the rear.
  • the gas spring 33 serves to lock the respectively desired pivoting position of the seat 43 and backrest 45 in the pivoting area between the working position and the rest position of the seating furniture.
  • the gas spring 33 as shown in Fig. 7, at its upper, on the intermediate frame part 31 supported end 33 'has a valve 55, in particular in the form of an on / off valve, which with the help of a Operating lever 35 (see FIG. 1) connected lever mechanism 37 can be operated.
  • lever mechanism 37 This extending between the operating lever 35 and the valve 55 lever mechanism 37 is partly arranged on the intermediate frame part 31 and partly in a cavity 31 'of the intermediate frame part 31.
  • the lever mechanism 37 in that section which directly adjoins the operating lever 35 initially consists of a lever arm 37 'pivotally mounted on the intermediate frame part 31'.
  • This pivotable mounting of the lever arm 37 ' is realized in the embodiment according to FIG. 7 in that the lever arm 37' has a curvature, in the area of which a rotating sleeve 46 is attached to the lever arm 37 ', which is rotatably mounted on a journal 47.
  • An actuating element 51 is connected to an end of the push rod 50 opposite the joint 49, through which either the closed position or the open position of the valve 55 of the gas spring 33 is directly achieved, the valve 55 being used for this purpose has a valve lifter 56 with which the actuating element 51 interacts.
  • this actuating element 51 is essentially U-shaped and has an upper, essentially straight first finger 52 and a lower, second finger 53 provided with two bending points, these two bending points being arranged in such a way that an inclined guide section 54 of the second finger 53 of the actuating element 51 results between them.
  • This inclined or oblique guide section 54 is preferably followed by a straight section of the second finger 53, which is located at a short distance from the first finger 52 of the actuating element 51.
  • the second finger 53 of the actuating element 51 is in direct contact with its surface with a head 57 of the valve lifter 56 of the valve 55, in such a way that, as a result of a displacement of the push rod 50 within the cavity 31 'of the intermediate frame part 31, the second finger 53 of the actuating element 51 and in particular its guide section 54 is slipped over the head 57 of the valve tappet 56, whereby this is controlled and thus the valve 55 of the gas spring 33 is actuated.
  • valve tappet 56 slides with its head 57 along the inclined or inclined surface of the guide section 54, as a result of which the valve tappet 56, which is preferably spring-loaded, is either pressed downwards depending on the relative displacement of the push rod 50 inside the intermediate frame part 31, which is a Relaxation of the gas spring 33 via the valve 55 results, or else the valve tappet 56 is allowed to return to occupy the highest position in which the valve 55 is closed.
  • the operating lever 35 and thus also the lever mechanism 37 connected to it within a predetermined pivoting range 58 has a first (lower) position 58 ', in which the valve 55 is closed and thus the currently set pivoting position of the seat 43 and the backrest 45 is locked. This is the locking position of the gas spring 33 shown in FIG. 7.
  • the operating lever 35 and the lever mechanism 37 connected to it have a second (upper) position 58 ⁇ located at the other end of the pivoting range, as is also indicated in FIG. 7, in which second position the valve 55 of the gas spring 33 is opened so that the seat 43 and backrest 45 of the office chair can be pivoted in the manner already explained above either by physical strength or by the energy accumulator (torsion spring elements).
  • a further actuating linkage 21 is arranged essentially in the form of a lever arm, with the actuating linkage 21 being rotatably supported two bearing sleeves 22 are provided, which are welded, for example, to one of the legs 8 of the U-shaped tube 6.
  • This to be operated with the help of a (not shown) handle linkage 21 is used to adjust the height of the support column 2 belonging to the base frame 1 and thus to adjust the height of the entire seating furniture, which, moreover, together with the upper, tubular part of the base frame 1 is rotatable with respect to the Support column 2 is mounted so that the seating shown here in the embodiment has the function of an office swivel chair.
  • the support column 2 is preferably designed as a gas spring.
  • the adjusting mechanism 23 for adjusting the pretension of the first bow spring 9 essentially consists of a housing 26 (cf. FIG. 1) which is fastened on the lower side of the plate 7 facing away from the first bow spring 9, specifically in the opening 14 'In the plate 7.
  • an intermediate housing 27 is also housed with a bolt 25 mounted therein, in such a way that the intermediate housing 27 is displaceable in the axial direction relative to the bolt 25, which through the opening 14th 'Extending end of the intermediate housing 27 cooperates with the sleeve 14, in which the curved middle part 13 of the first bow spring 9 is mounted.
  • this adjustment mechanism 23 has a rotary knob 24, in which the end of the bolt 25 facing away from the central part 13 of the bow spring 9 is fastened.
  • a rotary actuation of the rotary knob 24 causes a relative displacement of the intermediate housing 27 relative to the bolt 25 and thus a change in the position of the curved middle part 13 of the first bow spring 9 either upwards or downwards, which is equivalent to an adjustment of the spring preload of the first bow spring 9, which is directed in the opposite direction to the spring preload of the second bow spring 15.
  • the adjustment mechanism 23 is otherwise arranged in such a way that its axis is aligned obliquely to the axis of the base frame 1.
  • Fig. 3 is also indicated that the seat frame 28 is covered with a perforated plate 42, which in reality fills the entire space between the two seat frame legs 28a and 28b, a corresponding perforated sheet covering can also be provided in the region of the lower backrest frame part 29 , to the extent that a seat load also occurs in this lower backrest area 44.
  • a perforated plate 42 which in reality fills the entire space between the two seat frame legs 28a and 28b
  • a corresponding perforated sheet covering can also be provided in the region of the lower backrest frame part 29 , to the extent that a seat load also occurs in this lower backrest area 44.
  • Such covering with perforated plates 42 has the advantage over the known shell constructions that very good active ventilation of the entire seat surface is made possible.
  • the two extreme pivoting positions can be seen from FIG. 1, namely the working position 40, in which the rear region of the seat surface, ie in this case the lower region 44 of the backrest 45, is raised the greatest upwards, while the backrest 45 is pivoted forward most.
  • the broken position curve 41 indicates the rest position in which lower region 44 of the backrest 45 (and thus practically the rear seat surface) is greatest pressed down and the backrest 45 is pivoted the farthest back.
  • torsionally flexible articulation connections in particular in the form of torsion spring elements as energy stores, by means of which a separate articulation connection between the seat and seat support on the one hand and the backrest and seat support on the other hand is made possible, while the seat support itself is essentially pivotably immovable on the base frame the seat is attached.
  • the inventive design of the seating furniture achieves both an improved pivotability of the seat and backrest into the working position, with additional seat elasticity being achieved, in particular also flexibility in the lateral seat areas, ie. H. depending on the weight shift of the person sitting on the seating furniture to the right or left.

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)

Description

Die Erfindung betrifft ein Sitzmöbel gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to seating furniture according to the preamble of patent claim 1.

Sitzmöbel dieser Art sind bereits bekannt. Beispielsweise ist ein Sitzmöbel bekannt, das ein Fußgestell mit fest angebrachtem Fußgestellblock, einen Sitzträger sowie einen Rückenlehnenträger aufweist. Der Sitzträger ist in seinem vorderen Bereich um eine horizontal und quer zur Blickrichtung einer auf dem Sitzmöbel sitzenden Person verlaufenden Achse verschwenkbar an dem Fußgestellblock angelenkt, während der Rückenlehnenträger mit dem Fußgestellblock und dem Sitzträger um zu der vorgenannten ersten Achse parallel verlaufende zweite und dritte Achsen gelenkig verbunden ist. Hierbei befindet sich eine Anlenkverbindung des Rückenlehnenträgers und damit auch der Rückenlehne am rückwärtigen Ende des Sitzträgers.Seating of this type is already known. For example, a piece of seating furniture is known which has a base frame with a fixed base frame block, a seat support and a backrest support. In its front area, the seat support is pivotably articulated on the foot frame block about an axis running horizontally and transversely to the direction of view of a person sitting on the seating furniture, while the backrest support is articulated with the foot frame block and the seat support about second and third axes running parallel to the aforementioned first axis connected is. There is an articulated connection of the backrest support and thus also the backrest at the rear end of the seat support.

Bei dem bekannten Sitzmöbel bestehen die Einrichtungen zum synchron gekoppelten Verschwenken von Sitzträger und Rückenlehnenträger aus den verschiedenen Anlenkverbindungen zwischen Fußgestellblock, Sitzträger und Rückenlehnenträger und sind im übrigen in der Weise ausgebildet, daß eine Verschwenkung von Sitzträger und Rückenlehnenträger relativ zum Fußgestellblock jeweils in einer gemeinsamen Richtung erfolgt, jedoch hierbei der Rückenlehnenträger einen größeren Schwenkwinkel durchläuft als der Sitzträger. Ferner erfolgt hierbei die Verschwenkung aus der Arbeitsstellung nach unten/hinten in die Ruhestellung durch das Körpergewicht, dagegen die Schwenkung aus der Ruhestellung nach oben/vorne mittels eines Kraftspeichers, z. B. in Form einer Gasfeder, der sich unterhalb des Sitzträgers befindet und sich zwischen Fußgestellblock und Rückenlehnenträger abstützt.In the known seating, the devices for synchronously coupled pivoting of the seat support and backrest support consist of the various articulated connections between the base frame, seat support and backrest support and are otherwise designed in such a way that the pivoting of the seat support and backrest support relative to the foot support block takes place in a common direction , however, the backrest support passes through a larger swivel angle than the seat support. Furthermore, the Swiveling from the working position downwards / backwards into the rest position by the body weight, on the other hand the swiveling upwards / forwards from the rest position by means of an energy store, e.g. B. in the form of a gas spring, which is located below the seat support and is supported between the base block and backrest support.

Darüber hinaus ist bei dem bekannten Sitzmöbel vorgesehen, daß die erste Anlenkachse des Sitzträgers am Fußgestellblock, die zweite Anlenkachse des Rückenlehnenträgers am Fußgestellblock sowie die dritte Anlenkachse des Rückenlehnenträgers am Sitzträger etwa in einer geraden Linie oder zumindest in den seitlichen Bereichen einer mittleren geraden Linie derart liegen, daß die Kreisbögen der Schwenkradien von Sitzträger und Rückenlehnenträger an der dritten Anlenkachse nur wenig voneinander abweichen, wobei die erste Anlenkung des vorderen Sitzträgerbereiches an dem Fußgestellblock ohne Spiel, die dritte Anlenkung des rückwärtigen Sitzträgerendes an dem Rückenlehnenträger dagegen mit Spiel ausgebildet ist. Hierbei sind Sitzträger sowie Rückenlehnenträger verhältnismäßig kompliziert ausgebildet und weisen eine Vielzahl von Einzelbauteilen auf, zu deren Zusammensetzen eine entsprechend große Anzahl von Schraubverbindungen, Schraubbolzen, Nietverbindungen u. dgl. mehr erforderlich ist.In addition, it is provided in the known seating furniture that the first articulation axis of the seat support on the base frame block, the second articulation axis of the backrest support on the base frame block and the third articulation axis of the backrest support on the seat support lie approximately in a straight line or at least in the lateral areas of a middle straight line that the circular arcs of the swivel radii of the seat support and backrest support differ only slightly from one another on the third articulation axis, the first articulation of the front seat support area on the base frame block without play, the third articulation of the rear seat support end on the backrest support being designed with play. Here, the seat support and backrest support are relatively complicated and have a large number of individual components, for their assembly a correspondingly large number of screw connections, screw bolts, rivet connections and the like. Like. More is required.

Aus DE-GM 86 07 194.7 ist ferner ein Sitzmöbel mit den Merkmalen des Oberbegriffs des Anspruchs 1 bekannt geworden, bei welchem am Sitzträger ein Gelenkelement mit einer horizontalen Gelenkachse angeordnet ist, um welche zum einen das Unterteil der Rückenlehne derart dreht, daß die Rückenlehne nach hinten nachgeben kann und die außerdem einen Tragarm für die Sitzplatte trägt. Daraus ergibt sich eine Synchronbewegung zwischen Sitzplatte und Rückenlehne. Eine im Sitzträger vorgesehene Schraubenfeder, deren Zug einstellbar ist, sowie eine Gasfeder bewirken eine Aufrichtekraft von Sitzplatte und Rückenlehne.From DE-GM 86 07 194.7 a piece of seating furniture with the features of the preamble of claim 1 has also become known, in which a hinge element with a horizontal hinge axis is arranged on the seat support, about which the lower part of the backrest rotates in such a way that the backrest follows can give way in the back and also carries a support arm for the seat plate. This results in a synchronous movement between the seat plate and the backrest. A helical spring provided in the seat support, the tension of which is adjustable, and a gas spring cause an uplifting force of the seat plate and backrest.

Aus DE-PA 0 131 553 ist ferner ein Stuhl bekannt geworden, bei dem die Rückenlehne und die Sitzplatte ebenfalls Schwenkbewegungen durchführen. Auch dazu sind zwischen den beiden Elementen und dem Sitzträger wirksame Gelenke vorgesehen. Die Aufrichtekraft der Rückenlehne wird durch eine Torsionsfeder bewirkt, die am Sitzträger abgestützt ist und die Unterseite eines Rückenlehnenträgers mit Abstand von der Gelenkachse beaufschlagt.From DE-PA 0 131 553 a chair has also become known in which the backrest and the seat plate also perform pivoting movements. Effective joints are also provided between the two elements and the seat support. The uprighting force of the backrest is brought about by a torsion spring which is supported on the seat support and acts on the underside of a backrest support at a distance from the articulation axis.

Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, ein verbessertes Sitzmöbel mit den Merkmalen des Oberbegriffes des Patentanspruches 1 zu schaffen, das gegenüber dem Stand der Technik wesentlich einfacher konstruiert und damit kostengünstiger herstellbar ist, das ferner in seiner Anwendung den praktischen Bedürfnissen wesentlich besser entgegenkommt und bei dem vor allen Dingen die Verschwenkbewegungen von Sitz und Rückenlehne für die auf dem Sitzmöbel sitzende Person wesentlich körpergerechter realisierbar sind.The present invention has for its object to provide an improved seating with the features of the preamble of claim 1, which is constructed much simpler compared to the prior art and thus less expensive to manufacture, which also has practical uses in its application accommodates much better and in which, above all, the pivoting movements of the seat and backrest for the person sitting on the seating furniture can be realized in a much more physically appropriate manner.

Ausgehend von einem Sitzmöbel gemäß dem Oberbegriff des Anspruches 1 wird die vorgenannte Aufgabe erfindungsgemäß dadurch gelöst, daß der Sitzträger starr, d. h. im wesentlichen schwenkunbeweglich an dem Fußgestell befestigt ist und daß zwischen dem Sitzträger und dem Sitz einerseits und zwischen dem Sitzträger und der Rückenlehne andererseits jeweils Anlenkverbindungen vorgesehen sind, die durch drehelastische Verbindungselemente gebildet sind.Starting from a piece of seating furniture according to the preamble of claim 1, the aforementioned object is achieved according to the invention in that the seat support is rigid, ie. H. is pivotally fixed to the base frame and that in each case articulation connections are provided between the seat support and the seat on the one hand and between the seat support and the backrest on the other hand, which are formed by torsionally elastic connecting elements.

Weitere vorteilhafte Ausführungen und Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Further advantageous designs and refinements of the invention result from the subclaims.

So ist es zum Beispiel gemäß Anspruch 2 außerordentlich vorteilhaft, wenn die drehelastischen Verbindungselemente aus Torsionsfederelementen bestehen, welche sowohl auf Biegung als auch auf Torsion beanspruchbar sind und als Kraftspeicher dienen.For example, according to claim 2, it is extremely advantageous if the torsionally elastic connecting elements consist of torsion spring elements which can be subjected to both bending and torsion and which serve as energy stores.

In bevorzugter Weise können derartige Torsionsfederelemente in der Form von Bügelfedern ausgebildet sein, welche vorzugsweise aus Federstahlstäben gefertigt sind (Anspruch 3).Such torsion spring elements can preferably be designed in the form of bow springs, which are preferably made of spring steel bars (claim 3).

Für eine jede dieser Bügelfedern können separat jeweils Angriffstellen an dem Sitzträger und dem Sitz bzw. dem Sitzrahmen einerseits sowie an dem Sitzträger und der Rückenlehne bzw. dem Rückenlehnenrahmen andererseits vorgesehen sein.For each of these bow springs can separately attack points on the seat support and the seat or the seat frame on the one hand and on the seat support and the Backrest or the backrest frame on the other hand may be provided.

Hierbei kann es außerordentlich vorteilhaft sein, wenn den beiden drehelastischen Verbindungselementen Federvorspannungen aufgeprägt sind, die einander entgegengesetzt gerichtet sind. Die hierbei tatsächlich erforderlichen unterschiedlichen Federvorspannungen werden insbesondere nach Maßgabe der Rückstellkräfte gewählt, die für das Verschwenken aus der Ruhestellung in die Arbeitsstellung des Sitzmöbels erforderlich sind. Infolgedessen weist das eine drehelastische Verbindungselement, welches zwischen dem Sitzträger und dem Sitz bzw. dem Sitzrahmen angeordnet ist, eine in der Weise eingestellte Vorspannung auf, welche einer Sitzausrichtung bzw. Sitzneigung entspricht, bei welcher der vordere Sitzbereich am weitesten nach unten bzw. der rückwärtige Sitzbereich am weitesten nach oben angehoben ist.It can be extremely advantageous here if the two torsionally elastic connecting elements are impressed with spring preloads which are directed in opposite directions. The different spring preloads that are actually required are selected in particular in accordance with the restoring forces that are required for pivoting from the rest position into the working position of the seating furniture. As a result, the one torsionally elastic connecting element, which is arranged between the seat support and the seat or the seat frame, has a preload which is set in such a way that corresponds to a seat orientation or seat inclination in which the front seat region is the most downward or the rear one Seating area is raised the highest.

Dagegen weist das zweite, zwischen dem Sitzträger und der Rückenlehne bzw. dem Rückenlehnenrahmen angeordnete, drehelastische Verbindungselement eine in der Weise eingestellte, entgegengesetzt gerichtete Federvorspannung auf, welche einer Ausrichtung bzw. Neigung des rückwärtigen Sitzbereiches sowie der Rückenlehne und somit einer Verschwenklage entspricht, in welcher der rückwärtige Sitzbereich am größten nach oben angehoben und die Rückenlehne am weitesten nach vorne geschwenkt ist.On the other hand, the second, torsionally elastic connecting element arranged between the seat support and the backrest or the backrest frame has an oppositely directed spring preload which corresponds to an orientation or inclination of the rear seat area and the backrest and thus a pivoting position, in which the rear seat area is raised the largest and the backrest is pivoted forward the most.

Hierbei kann es ferner außerordentlich günstig sein, wenn zumindest eine der wie oben erläuterten Federvorspannungen der beiden drehelastischen Verbindungselemente veränderbar bzw. verstellbar ist. Infolgedessen ist es beispielsweise möglich, die beiden einander entgegengesetzt gerichteten Federvorspannungen im Bedarfsfalle noch zu erhöhen und so einzustellen, daß für das Verschwenken aus der Arbeitsstellung in die Ruhestellung, in der also der rückwärtige Sitzbereich am größten nach unten gedrückt und die Rückenlehne am weitesten nach hinten geschwenkt ist, ein größerer Kraftaufwand seitens der auf dem Sitzmöbel sitzenden Person erforderlich ist, unter der Voraussetzung, daß gleichzeitig die sich zwischen dem unteren Bereich der Rückenlehne und dem oberen Bereich des Fußgestells abstützende Gasfeder durch entsprechende Ventilbetätigung entspannt wird.It can also be extremely favorable here if at least one of the spring preloads of the two torsionally elastic connecting elements, as explained above is changeable or adjustable. As a result, it is possible, for example, to increase the two oppositely directed spring preloads if necessary and to adjust them so that for pivoting out of the working position into the rest position, in which the rear seat area is pressed down the most and the backrest furthest to the rear is pivoted, a greater effort on the part of the person sitting on the seating furniture is required, provided that at the same time the gas spring, which is supported between the lower region of the backrest and the upper region of the base frame, is relaxed by appropriate valve actuation.

Selbstverständlich ist zwischen diesen beiden Extremstellungen, d. h. zwischen der Arbeitsstellung und der Ruhestellung, jede beliebige Verschwenkstellung von Sitz und Rückenlehne praktisch stufenlos einstellbar, wobei die jeweils erreichte, erwünschte Verschwenklage durch Betätigung der Gasfeder verriegelbar ist.Of course, between these two extreme positions, i. H. Between the working position and the rest position, any pivoting position of the seat and backrest can be adjusted practically continuously, the desired pivoting position achieved in each case being lockable by actuating the gas spring.

Vorteilhafte Anordnungsmöglichkeiten der drehelastischen Verbindungselemente zwischen dem Sitz bzw. Sitzrahmen und dem Sitzträger einerseits und zwischen dem Rückenlehnenrahmen und dem Sitzträger andererseits ergeben sich aus Anspruch 6.Advantageous arrangement options for the torsionally elastic connecting elements between the seat or seat frame and the seat support on the one hand and between the backrest frame and the seat support on the other hand result from claim 6.

Die Ansprüche 7 und 8 befassen sich mit bevorzugten Ausbildungen und Anordnungen der beiden drehelastischen Verbindungselemente.Claims 7 and 8 deal with preferred configurations and arrangements of the two torsionally elastic connecting elements.

Die Merkmale der Ansprüche 9 und 10 betreffen eine günstige Ausbildung des Sitzträgers und dessen Anordnung im Rahmen der Gesamtkonstruktion des Sitzmöbels.The features of claims 9 and 10 relate to a favorable design of the seat support and its arrangement within the framework of the overall construction of the seating.

Die Ansprüche 11 und 12 betreffen eine vorteilhafte Anordnung und Ausbildung eines Verstellmechanismus, mit dessen Hilfe die erwünschte Federvorspannung eines der beiden drehelastischen Verbindungselemente variiert werden kann.Claims 11 and 12 relate to an advantageous arrangement and design of an adjustment mechanism, with the aid of which the desired spring preload of one of the two torsionally elastic connecting elements can be varied.

Vorteilhafte, weitere konstruktive Detailausführungen des erfindungsgemäßen Sitzmöbels ergeben sich aus den weiteren Unteransprüchen.Advantageous, further design details of the seating furniture according to the invention result from the further subclaims.

Zur näheren Erläuterung der Erfindung, ihrer weiteren Merkmale und Vorteile dient die beigefügte Zeichnung, in welcher Ausführungsbeispiele des erfindungsgemäßen Sitzmöbels sowie dessen Bauelemente dargestellt sind. Gleiche Teile und Elemente sind hierbei stets mit den gleichen Bezugsziffern bezeichnet.The attached drawing, in which exemplary embodiments of the seating furniture according to the invention and its components are shown, serve to explain the invention, its further features and advantages in more detail. The same parts and elements are always designated with the same reference numbers.

Dabei zeigt:

Fig. 1
in einer schematischen und teilweisen Seitenansicht sowie in einer teilweisen Schnittdarstellung einen Bürostuhl;
Fig. 2
eine Ansicht von unten auf den Sitzträger und zwar i. w. gemäß der Linie II-II gemäß Fig. 1;
Fig. 3
eine schematische Ansicht von oben auf Sitzträger, Sitzrahmen und einen Teil des Rückenlehnenrahmens;
Fig. 4
eine Frontansicht der ersten Bügelfeder, die zwischen dem Sitzträger und dem Sitz bzw. dem Sitzrahmen angeordnet ist;
Fig. 5
eine Frontansicht der zweiten Bügelfeder, die zwischen dem Sitzträger und der Rückenlehne bzw. dem Rückenlehnenrahmen angeordnet ist;
Fig. 6
eine schematische, perspektivische Ansicht der den Sitz mit Rückenlehne bildenden Rahmenteile;
Fig. 7
eine schematische Ansicht eines Hebelmechanismus zur Betätigung einer Gasfeder zur Verriegelung der jeweils erwünschten Verschwenkstellung von Sitz und Rückenlehne;
It shows:
Fig. 1
an office chair in a schematic and partial side view and in a partial sectional view;
Fig. 2
a bottom view of the seat support, namely iw along the line II-II of FIG. 1;
Fig. 3
a schematic view from above of the seat support, seat frame and part of the backrest frame;
Fig. 4
a front view of the first bow spring, which is arranged between the seat support and the seat or the seat frame;
Fig. 5
a front view of the second bow spring, which is arranged between the seat support and the backrest or the backrest frame;
Fig. 6
is a schematic, perspective view of the frame parts forming the seat with backrest;
Fig. 7
a schematic view of a lever mechanism for actuating a gas spring to lock the desired pivoting position of the seat and backrest;

Aus der Fig. 1 ist die Seitenansicht eines Bürostuhles zu entnehmen, der ein Fußgestell 1 aufweist, welches i. w. aus einem Rohr besteht, wobei im Inneren des Fußgestelles 1 eine beispielsweise als Gasfeder ausgebildete Tragsäule 2 angeordnet ist, die an ihrem oberen Ende einen Konuszapfen 3 trägt, der in eine entsprechende, mit einem Sitzträger 5 verbundene Hülse 4 eingesteckt ist.1 shows the side view of an office chair which has a base frame 1 which i. w. consists of a tube, a support column 2, for example designed as a gas spring, is arranged in the interior of the base frame 1 and carries at its upper end a conical pin 3 which is inserted into a corresponding sleeve 4 connected to a seat support 5.

Das untere Ende der Tragsäule 2 des Fußgestells 1 ist auf (hier nicht dargestellten) Rollen gelagert.The lower end of the support column 2 of the base frame 1 is mounted on rollers (not shown here).

Am oberen Ende des Fußgestelles 1 ist der Sitzträger 5 mit der Hülse 4 sowie mit dem äußeren Rohr des Fußgestelles 1 fest und i. w. schwenkunbeweglich verbunden und beispielsweise an das obere Ende des Fußgestelles 1 angeschweißt.At the upper end of the base frame 1, the seat support 5 with the sleeve 4 and with the outer tube of the base frame 1 is fixed and i. w. pivotally connected and welded, for example, to the upper end of the base frame 1.

Der Sitzträger 5 ist im Detail aus Fig. 2 ersichtlich. Er besteht i. w. aus einem U-förmig gebogenen Rohr 6 mit zwei Schenkeln 8, zwischen denen eine Platte 7 angeordnet ist, welche seitlich jeweils mit den Schenkeln 8 sowie mit dem bogenförmigen Bereich des U-Rohres 6 fest verbunden ist.The seat support 5 can be seen in detail from FIG. 2. It consists i. w. from a U-shaped tube 6 with two legs 8, between which a plate 7 is arranged, which is laterally firmly connected to the legs 8 and to the arcuate region of the U-tube 6.

Ferner ist die Platte 7, wie wiederum aus Fig. 1 zu ersehen ist, mit den oberen Enden der Hülse 4 sowie des äußeren Rohres des Fußgestelles 1 fest verbunden, beispielsweise durch entsprechende Schweißverbindungen, wobei der Sitzträger 5 von dem Fußgestell 1 ausgehend eine Neigung hat, die schräg nach oben in Richtung zum vorderen Sitzflächenende hin gerichtet ist.Furthermore, the plate 7, as can be seen again from FIG. 1, is firmly connected to the upper ends of the sleeve 4 and the outer tube of the base frame 1, for example by appropriate welded connections, the seat support 5 starting from the base frame 1 having an inclination , which is directed obliquely upwards towards the front end of the seat.

Im Bereich oberhalb des Sitzträgers 5 besteht der Bürostuhl i. w. aus einem Sitz 43 mit Sitzrahmen 28 sowie einer Rückenlehne 45 mit Rückenlehnenrahmen 36, welcher einen unteren Rückenlehnenrahmenteil 29 aufweist, durch den ein unterer Bereich 44 der Rückenlehne 45 definiert ist. Dieser untere Rückenlehnenbereich 44 besitzt praktisch auch die Funktion eines rückwärtigen Sitzflächenbereiches, während der Sitz 43 praktisch den vorderen Sitzflächenbereich bildet (vgl. auch Fig. 6).In the area above the seat support 5, the office chair i. w. a seat 43 with a seat frame 28 and a backrest 45 with a backrest frame 36, which has a lower backrest frame part 29, by which a lower region 44 of the backrest 45 is defined. This lower backrest area 44 practically also functions as a rear seating area, while the seat 43 practically forms the front seating area (cf. also FIG. 6).

Wie die Fig. 3 und 6 zeigen, weist der Sitzrahmen 28 zwei seitliche, i. w. zueinander parallel erste und zweite Schenkel 28a und 28b auf, welche jeweils über erste und zweite Drehgelenke 30a und 30b mit sich daran anschließenden ersten und zweiten Schenkeln 29a und 29b des unteren Rückenlehnenrahmenteiles 29 des Rückenlehnenrahmens 36 verbunden sind, wodurch Verschwenkbewegungen von Sitzrahmen 28 und Rückenlehnenrahmen 36 relativ zueinander ermöglicht sind.3 and 6 show, the seat frame 28 has two lateral, iw parallel first and second legs 28a and 28b, which are each connected via first and second swivel joints 30a and 30b to adjoining first and second legs 29a and 29b of the lower backrest frame part 29 of the backrest frame 36, whereby pivoting movements of the seat frame 28 and backrest frame 36 relative to one another are made possible .

Der obere, i. w. aus der Rückenlehne 45 sowie aus Armlehnen 38 bestehende Teil des Bürostuhles ist in der Fig. 1 aus Platzgründen nicht dargestellt worden. Insoweit wird auf Fig. 6 verwiesen.The upper, i. w. part of the office chair consisting of the backrest 45 and armrests 38 has not been shown in FIG. 1 for reasons of space. In this regard, reference is made to FIG. 6.

Die beiden sich jeweils vom Sitzrahmen 28 aus zu dem Rückenlehnenrahmen 36 hin erstreckenden Armlehnen 38 sind mit biegeelastischen oder flexiblen Knickstellen versehen, um die relativen Verschwenkbewegungen von Sitzrahmen 28 und Rückenlehnenrahmen 38 mitmachen zu können, wobei die Armlehnen 38 mit ihren jeweiligen Enden über entsprechend angeordnete Drehgelenke 39 sowohl mit dem Sitzrahmen 28 als auch mit dem Rückenlehnenrahmen 36 verbunden sind. Derartige Drehgelenke 39 sind beispielsweise in den Fig. 1 und 6 schematisch dargestellt, wobei es sich um die gelenkigen Verbindungen der Armlehnen 38 mit den beiden ersten und zweiten Schenkeln 28a und 28b des Sitzrahmens 28 sowie mit den beiden ersten und zweiten Schenkeln 29a und 29b des unteren Rückenlehnenrahmenteils 29 handelt.The two armrests 38 each extending from the seat frame 28 to the backrest frame 36 are provided with flexible or flexible kinks in order to be able to participate in the relative pivoting movements of the seat frame 28 and the backrest frame 38, the armrests 38 with their respective ends via correspondingly arranged swivel joints 39 are connected to both the seat frame 28 and the backrest frame 36. Such swivel joints 39 are shown schematically in FIGS. 1 and 6, for example, which are the articulated connections of the armrests 38 with the two first and second legs 28a and 28b of the seat frame 28 and with the two first and second legs 29a and 29b of the lower backrest frame part 29 is.

Wie insbesondere aus den Fig. 1 und 3 zu ersehen ist, ist der Sitzträger 5 über eine erste Bügelfeder 9 mit den Schenkeln 28a und 28b des Sitzrahmes 28 verbunden. Ferner ist der Sitzträger 5 über eine zweite Bügelfeder 15 mit den Schenkeln 29a und 29b des unteren Rückenlehnenrahmenteils 29 des Rückenlehnenrahmens 36 verbunden. Durch diese beiden ersten und zweiten Bügelfedern 9 und 15 sind jeweils drehelastische Anlenkverbindungen zwischen dem Sitzträger 5 und dem Sitzrahmen 28 (und damit dem Sitz 43) einerseits sowie zwischen dem Sitzträger 5 und dem unteren Rückenlehnenrahmenteil 29 (und damit auch der Rückenlehne 45) andererseits realisiert, wobei diese beiden vorzugsweise aus Federstahl bestehenden und einander entgegengerichtete Federvorspannungen aufweisenden Bügelfedern 9 und 15 jeweils Torsionsfederelemente darstellen, die sowohl auf Biegung als auch auf Torsion beansprucht werden, wenn Sitz 43 und Rückenlehne 45 mit dem unteren Rückenlehnenbereich in synchron gekoppelter Weise miteinander verschwenkt werden, wie dies bereits eingangs näher erläutert wurde.As can be seen in particular from FIGS. 1 and 3, the seat support 5 is connected to the legs 28a and 28b of the seat frame 28 via a first bow spring 9. Furthermore, the seat support 5 is via a second bow spring 15 connected to the legs 29a and 29b of the lower backrest frame part 29 of the backrest frame 36. These two first and second bow springs 9 and 15 each provide torsionally flexible articulated connections between the seat support 5 and the seat frame 28 (and thus the seat 43) on the one hand and between the seat support 5 and the lower backrest frame part 29 (and thus also the backrest 45) on the other hand , wherein these two bow springs 9 and 15, which are preferably made of spring steel and have opposite spring preloads, each represent torsion spring elements which are subjected to both bending and torsion when the seat 43 and backrest 45 are pivoted with the lower backrest region in a synchronously coupled manner, as already explained in more detail at the beginning.

In bevorzugter Weise weist die erste Bügelfeder 9 seitlich jeweils ein freies Ende 10 auf, wie insbesondere die Fig. 3 zeigt, und diese freien Enden der Bügelfeder 9 dienen zur Herstellung der Verbindungen mit dem Sitzrahmen 28. Zu diesem Zweck sind die freien Enden 10 der Bügelfeder 9 jeweils i. w. parallel zu den beiden Schenkeln 28a und 28b des Sitzrahmens 28 gebogen, während an diesen Schenkeln 28a und 28b jeweils ein Halteelement 11, z. B. in Form einer Aufnahmebuchse, angebracht ist, das zur Befestigung eines freien Endes 10 der Bügelfeder 9 dient. Weiterhin erstrecken sich von diesen freien Enden 10 der ersten Bügelfeder 9 aus jeweils rechtwinklig abgebogene Abschnitte 9a und 9b bis zu den zum vorderen Sitzende weisenden Enden des Sitzträgers 5 hin. Im einzelnen weisen die beiden Schenkel 8 des U-förmig gebogenen Rohres 6 des Sitzträges 5, welche in Richtung zum vorderen Sitzende hin verlaufen, jeweils eine Drehlagerbuchse 12 auf, welche der ersten Bügelfeder 9 zugeordnet ist, deren sich zum Sitzträger 5 hin erstreckende Abschnitte 9a und 9b in Höhe der Schenkel 8 in diesen Drehlagerbuchsen 12 drehbeweglich gelagert sind. Im Anschluß and diese Drehlagerbuchsen 12 setzt sich die Bügelfeder 9 in einem zum rückwärtigen Sitzträgerbereich weisenden, gebogenen Mittelteil 13 fort, welches zum Beispiel hufeisenförmig gebogen und relativ zum Sitzträger 5 beweglich ist, wobei der hinterste Abschnitt des gebogenen Mittelteiles 13 in einer Hülse 14 gelagert ist. Die Platte 7 des Sitzträgers 5 weist etwa in ihrem mittleren Bereich eine Öffnung 14′ auf, welche genau in Höhe des hinteren Abschnittes oder hinteren Endes des gebogenen Mittelteiles 13 angeordnet und einem weiter unten noch zu erläuternden Verstellmechanismus zum Verstellen der Vorspannung der ersten Bügelfeder 9 zugeordnet ist.3, and these free ends of the bow spring 9 are used to make the connections to the seat frame 28. For this purpose, the free ends 10 are the Bow spring 9 each bent parallel to the two legs 28a and 28b of the seat frame 28, while on these legs 28a and 28b each have a holding element 11, for. B. in the form of a receptacle, which is used to attach a free end 10 of the bow spring 9. Furthermore, these free ends 10 of the first bow spring 9 each extend from sections 9a and 9b which are bent at right angles to the ends of the seat support 5 pointing towards the front end of the seat. Specifically, the two legs 8 of the U-shaped tube 6 of the seat support 5, which run in the direction of the front end of the seat, each on a pivot bearing bushing 12, which is assigned to the first bow spring 9, the sections 9a and 9b extending toward the seat support 5 at the level of the legs 8 are rotatably mounted in these pivot bearing bushings 12. Following these rotary bearing bushes 12, the bow spring 9 continues in a curved middle part 13 pointing towards the rear seat support region, which is, for example, horseshoe-shaped and movable relative to the seat support 5, the rearmost section of the curved middle part 13 being mounted in a sleeve 14 . The plate 7 of the seat support 5 has approximately in its central region an opening 14 ', which is arranged exactly at the level of the rear portion or rear end of the curved central part 13 and an adjustment mechanism to be explained below for adjusting the bias of the first bow spring 9 is.

Die zweite Bügelfeder 15 mit einer zur Vorspannung der ersten Bügelfeder 9 entgegengesetzt gerichteten Vorspannung ist in der Weise ausgebildet, daß sie zwei zu den beiden Schenkeln 29a und 29b des unteren Rückenlehnenrahmenteiles 29 jeweils parallel verlaufende, freie Enden 16 aufweist, welche zur Herstellung der Verbindungen mit dem unteren Rückenlehnenrahmenteil 29 und damit gleichzeitig mit dem Rückenlehnenrahmen 36 dienen.The second bow spring 15 with a bias towards the bias of the first bow spring 9 is designed in such a way that it has two free ends 16, which run parallel to the two legs 29a and 29b of the lower backrest frame part 29 and which are used to make the connections with serve the lower backrest frame part 29 and thus simultaneously with the backrest frame 36.

An den beiden Schenkeln 29a und 29b sind in entsprechender Weise wie an den beiden Schenkeln 28a und 28b des Sitzrahmens 28 jeweils Halteelemente 17, z. B. in Form von Aufnahmebuchsen, angebracht, in welchen die freien Enden 16 der zweiten Bügelfeder 15 befestigt sind. An diese beiden freien Enden 16 schließen sich jeweils in Richtung zum Sitzträger 5 hin abgebogene, schräg verlaufende Abschnitte 19 an, welche sodann in einen diese Abschnitte 19 miteinander verbindenden, geraden Mittelabschnitt 20 übergehen, der dem gebogenen Mittelteil 13 der ersten Bügelfeder 9 gegenüberliegt. In dem hinteren Bereich der beiden parallelen Schenkel 8 des U-Rohres 6 des Sitzträgers 5 ist jeweils eine Drehlagerbuchse 18 angeordnet, wobei diese beiden Drehlagerbuchsen 18 zur drehbeweglichen Lagerung des gerade Mittelabschnitts 20 der zweiten Bügelfeder 15 dienen. Der drehbeweglichen Lagerung der ersten Bügelfeder 9 (vgl. auch Fig. 4) in den Drehlagerbuchsen 12 entspricht somit die Lagerung der zweiten Bügelfeder 15 (vgl. auch Fig. 5) in den Drehlagerbuchsen 18.On the two legs 29a and 29b are in the same way as on the two legs 28a and 28b of the seat frame 28 holding elements 17, z. B. in the form of receptacles, in which the free ends 16 of the second bow spring 15 are attached. At these two free ends 16 are each connected in the direction of the seat support 5 and bent, inclined sections 19, which then merge into a straight middle section 20 connecting these sections 19, which is opposite the curved middle part 13 of the first bow spring 9. In the rear area of the two parallel legs 8 of the U-tube 6 of the seat support 5 there is in each case a pivot bearing bush 18, these two pivot bushings 18 being used for rotatably supporting the straight central section 20 of the second bow spring 15. The rotatable mounting of the first bow spring 9 (see also FIG. 4) in the pivot bearing bushes 12 thus corresponds to the mounting of the second bow spring 15 (see also FIG. 5) in the pivot bearing bushes 18.

Wie ferner die Fig. 1, 3 und 7 zeigen, sind die beiden ersten und zweiten Schenkel 29a und 29b des unteren Rückenlehnenrahmenteils 29 durch ein Zwischenrahmenteil 31 miteinander verbunden, welches in seiner Mitte ein hülsenförmiges Befestigungselement 32 trägt, das zur Abstützung eines oberen Endes 33′ einer Gasfeder 33 dient, wie dies insbesondere aus den Fig. 1 und 7 zu ersehen ist. Diese mit Hilfe eines zugehörigen Bedienungshebels 35 betätigbare Gasfeder 33 stützt sich andererseits mit ihrem unteren Ende 33˝ an einem nach hinten gerichteten Arm 34 des Fußgestells 1 ab.1, 3 and 7, the two first and second legs 29a and 29b of the lower backrest frame part 29 are connected to one another by an intermediate frame part 31, which carries in its center a sleeve-shaped fastening element 32, which supports an upper end 33 'A gas spring 33 is used, as can be seen in particular from FIGS. 1 and 7. On the other hand, this gas spring 33, which can be actuated with the aid of an associated operating lever 35, is supported with its lower end 33˝ on an arm 34 of the base frame 1 directed towards the rear.

Die Gasfeder 33 dient zur Verriegelung der jeweils erwünschten Verschwenkstellung von Sitz 43 und Rückenlehne 45 im Verschwenkbereich zwischen der Arbeitsstellung und der Ruhestellung des Sitzmöbels.The gas spring 33 serves to lock the respectively desired pivoting position of the seat 43 and backrest 45 in the pivoting area between the working position and the rest position of the seating furniture.

Zu diesem Zweck weist die Gasfeder 33, wie dies in der Fig. 7 dargestellt ist, an ihrem oberen, an dem Zwischenrahmenteil 31 abgestützten Ende 33′ ein Ventil 55 auf, insbesondere in Form eines Auf/Zu-Ventils, das mithilfe eines mit dem Bedienungshebel 35 (vgl. Fig. 1) verbundenen Hebelmechanismus 37 betätigt werden kann.For this purpose, the gas spring 33, as shown in Fig. 7, at its upper, on the intermediate frame part 31 supported end 33 'has a valve 55, in particular in the form of an on / off valve, which with the help of a Operating lever 35 (see FIG. 1) connected lever mechanism 37 can be operated.

Dieser sich zwischen dem Bedienungshebel 35 und dem Ventil 55 erstreckende Hebelmechanismus 37 ist zum Teil an dem Zwischenrahmenteil 31 und zum Teil in einem Hohlraum 31′ des Zwischenrahmenteils 31 angeordnet. In bevorzugter Weise besteht der Hebelmechanismus 37 in demjenigen Abschnitt, der sich unmittelbar an den Bedienungshebel 35 anschließt, zunächst aus einem am Zwischenrahmenteil 31 verschwenkbar gelagerten Hebelarm 37′. Diese verschwenkbare Lagerung des Hebelarmes 37′ ist im Ausführungsbeispiel gemäß Fig. 7 dadurch realisiert, daß der Hebelarm 37′ eine Krümmung aufweist, in deren Bereich eine Drehhülse 46 am Hebelarm 37′ angebracht ist, welche auf einem Lagerzapfen 47 drehbar gelagert ist. Ein sich an die Krümmung anschließender Abschnitt des Hebelarmes 37′ ragt durch eine Ausnehmung 48 in der Wandung des Zwischenrahmenteils 31 in einen Hohlraum 31′ des Zwischenrahmenteils 31 hinein, wobei an dem dortigen Ende des Hebelarmes 37′ ein Gelenk 49 angeordnet ist, mit welchem ein Ende einer in dem Hohlraum 31′ angeordneten Schubstange 50 gelenkig verbunden ist. Mit einem dem Gelenk 49 entgegengesetzten Ende der Schubstange 50 ist ein Betätigungselement 51 verbunden, durch das unmittelbar entweder die geschlossene Stellung oder die geöffnete Stellung des Ventils 55 der Gasfeder 33 erzielt wird, wobei zu diesem Zweck das Ventil 55 einen Ventilstößel 56 aufweist, mit welchem das Betätigungselement 51 zusammenwirkt.This extending between the operating lever 35 and the valve 55 lever mechanism 37 is partly arranged on the intermediate frame part 31 and partly in a cavity 31 'of the intermediate frame part 31. In a preferred manner, the lever mechanism 37 in that section which directly adjoins the operating lever 35 initially consists of a lever arm 37 'pivotally mounted on the intermediate frame part 31'. This pivotable mounting of the lever arm 37 'is realized in the embodiment according to FIG. 7 in that the lever arm 37' has a curvature, in the area of which a rotating sleeve 46 is attached to the lever arm 37 ', which is rotatably mounted on a journal 47. An adjoining the curvature section of the lever arm 37 'protrudes through a recess 48 in the wall of the intermediate frame part 31 into a cavity 31' of the intermediate frame part 31, a joint 49 being arranged at the end of the lever arm 37 'there, with which a End of a in the cavity 31 'arranged push rod 50 is articulated. An actuating element 51 is connected to an end of the push rod 50 opposite the joint 49, through which either the closed position or the open position of the valve 55 of the gas spring 33 is directly achieved, the valve 55 being used for this purpose has a valve lifter 56 with which the actuating element 51 interacts.

Im Ausführungsbeispiel gemäß Fig. 7 ist dieses Betätigungselement 51 im wesentlichen U-förmig ausgebildet und weist einen oberen, im wesentlichen gerade gerichteten ersten Finger 52 sowie einen unteren, mit zwei Biegestellen versehenen zweiten Finger 53 auf, wobei diese beiden Biegestellen so angeordnet sind, daß sich zwischen ihnen ein geneigter Führungsabschnitt 54 des zweiten Fingers 53 des Betätigungselements 51 ergibt. Vorzugsweise schließt sich an diesen geneigten oder schiefen Führungsabschnitt 54 noch ein gerader Abschnitt des zweiten Fingers 53 an, welcher mit geringem Abstand dem ersten Finger 52 des Betätigungselementes 51 gegenüberliegt. Der zweite Finger 53 des Betätigungselements 51 steht mit seiner Oberfläche in unmittelbarem Kontakt mit einem Kopf 57 des Ventilstößels 56 des Ventils 55, und zwar derart, daß infolge einer Verschiebung der Schubstange 50 innerhalb des Hohlraumes 31′ des Zwischenrahmenteils 31 der zweite Finger 53 des Betätigungselementes 51 und insbesondere dessen Führungsabschnitt 54 über den Kopf 57 des Ventilstößels 56 gestreift wird, wodurch dieser gesteuert und damit das Ventil 55 der Gasfeder 33 betätigt wird. Mit anderen Worten gleitet der Ventilstößel 56 mit seinem Kopf 57 entlang der geneigten oder schiefen Oberfläche des Führungsabschnittes 54, wodurch der vorzugsweise unter Federvorspannung stehende Ventilstößel 56 in Abhängigkeit von der Relativverschiebung der Schubstange 50 im Inneren des Zwischenrahmenteils 31 entweder nach unten gedrückt wird, was eine Entspannung der Gasfeder 33 über das Ventil 55 zur Folge hat, oder aber es dem Ventilstößel 56 gestattet wird, wieder seine oberste Stellung einzunehmen, in welcher das Ventil 55 geschlossen ist.In the exemplary embodiment according to FIG. 7, this actuating element 51 is essentially U-shaped and has an upper, essentially straight first finger 52 and a lower, second finger 53 provided with two bending points, these two bending points being arranged in such a way that an inclined guide section 54 of the second finger 53 of the actuating element 51 results between them. This inclined or oblique guide section 54 is preferably followed by a straight section of the second finger 53, which is located at a short distance from the first finger 52 of the actuating element 51. The second finger 53 of the actuating element 51 is in direct contact with its surface with a head 57 of the valve lifter 56 of the valve 55, in such a way that, as a result of a displacement of the push rod 50 within the cavity 31 'of the intermediate frame part 31, the second finger 53 of the actuating element 51 and in particular its guide section 54 is slipped over the head 57 of the valve tappet 56, whereby this is controlled and thus the valve 55 of the gas spring 33 is actuated. In other words, the valve tappet 56 slides with its head 57 along the inclined or inclined surface of the guide section 54, as a result of which the valve tappet 56, which is preferably spring-loaded, is either pressed downwards depending on the relative displacement of the push rod 50 inside the intermediate frame part 31, which is a Relaxation of the gas spring 33 via the valve 55 results, or else the valve tappet 56 is allowed to return to occupy the highest position in which the valve 55 is closed.

Dementsprechend besitzt der Bedienungshebel 35 und damit auch der mit diesem verbundene Hebelmechanismus 37 innerhalb eines vorgegebenen Verschwenkbereiches 58 eine erste (untere) Stellung 58′, in welcher das Ventil 55 geschlossen und damit die jeweils eingestellte momentane Verschwenkstellung von Sitz 43 und Rückenlehne 45 verriegelt ist. Hierbei handelt es sich um die in Fig. 7 dargestellte Verriegelungsstellung der Gasfeder 33.Accordingly, the operating lever 35 and thus also the lever mechanism 37 connected to it within a predetermined pivoting range 58 has a first (lower) position 58 ', in which the valve 55 is closed and thus the currently set pivoting position of the seat 43 and the backrest 45 is locked. This is the locking position of the gas spring 33 shown in FIG. 7.

Auf der anderen Seite besitzt der Bedienungshebel 35 und der mit diesem verbundene Hebelmechanismus 37 eine am anderen Ende des Verschwenkbereiches befindliche, zweite (obere) Stellung 58˝, wie dies ebenfalls in Fig. 7 angedeutet ist, in welcher zweiten Stellung das Ventil 55 der Gasfeder 33 geöffnet ist, so daß Sitz 43 und Rückenlehne 45 des Bürostuhles in der bereits weiter oben erläuterten Art und Weise entweder durch Körperkraft oder durch den Kraftspeicher (Torsionsfederelemente) verschwenkbar sind.On the other hand, the operating lever 35 and the lever mechanism 37 connected to it have a second (upper) position 58˝ located at the other end of the pivoting range, as is also indicated in FIG. 7, in which second position the valve 55 of the gas spring 33 is opened so that the seat 43 and backrest 45 of the office chair can be pivoted in the manner already explained above either by physical strength or by the energy accumulator (torsion spring elements).

Wie weiterhin aus den Fig. 1 und 2 zu ersehen ist, ist auf der den beiden Bügelfedern 9 und 15 abgewendeten Unterseite der Platte 7 des Sitzträgers 5 ein weiteres Betätigungsgestänge 21 im wesentlichen in der Form eines Hebelarmes angeordnet, wobei zur drehbeweglichen Lagerung des Betätigungsgestänges 21 zwei Lagerhülsen 22 vorgesehen sind, welche zum Beispiel an einem der Schenkel 8 des U-förmigen Rohres 6 angeschweißt sind.As can also be seen from FIGS. 1 and 2, on the underside of the plate 7 of the seat support 5 facing away from the two bow springs 9 and 15, a further actuating linkage 21 is arranged essentially in the form of a lever arm, with the actuating linkage 21 being rotatably supported two bearing sleeves 22 are provided, which are welded, for example, to one of the legs 8 of the U-shaped tube 6.

Dieses mit Hilfe eines (nicht gezeigten) Handgriffes zu bedienende Betätigungsgestänge 21 dient zur Höhenverstellung der zu dem Fußgestell 1 gehörigen Tragsäule 2 und damit zur Höhenverstellung des gesamten Sitzmöbels, welches im übrigen zusammen mit dem oberen, rohrförmigen Teil des Fußgestelles 1 drehbeweglich im Bezug auf die Tragsäule 2 gelagert ist, so daß das hier im Ausführungsbeispiel dargestellte Sitzmöbel die Funktion eines Bürodrehstuhles besitzt.This to be operated with the help of a (not shown) handle linkage 21 is used to adjust the height of the support column 2 belonging to the base frame 1 and thus to adjust the height of the entire seating furniture, which, moreover, together with the upper, tubular part of the base frame 1 is rotatable with respect to the Support column 2 is mounted so that the seating shown here in the embodiment has the function of an office swivel chair.

Die Tragsäule 2 ist im übrigen vorzugsweise als Gasfeder ausgebildet.The support column 2 is preferably designed as a gas spring.

Der Verstellmechanismus 23 zum Verstellen der Vorspannung der ersten Bügelfeder 9 besteht im wesentlichen aus einem Gehäuse 26 (vgl. Fig. 1), das auf der der ersten Bügelfeder 9 abgewendeten, unteren Seite der Platte 7 befestigt ist, und zwar genau in der Öffnung 14′ in der Platte 7. In dem Gehäuse 26 des Verstellmechanismus 23 ist weiterhin ein Zwischengehäuse 27 mit einem darin gelagerten Bolzen 25 untergebracht, und zwar derart, daß das Zwischengehäuse 27 in Axialrichtung relativ zu dem Bolzen 25 verschiebbar ist, wobei das durch die Öffnung 14′ hindurch verlaufende Ende des Zwischengehäuses 27 mit der Hülse 14 zusammenwirkt, in welcher der gebogene Mittelteil 13 der ersten Bügelfeder 9 gelagert ist. Weiterhin weist dieser Verstellmechanismus 23 einen Drehknopf 24 auf, in welchem das dem Mittelteil 13 der Bügelfeder 9 abgewendete Ende des Bolzens 25 befestigt ist. Durch eine Drehbetätigung des Drehknopfes 24 wird eine Relativverschiebung des Zwischengehäuses 27 relativ zu dem Bolzen 25 bewirkt und damit eine Lageveränderung des gebogenen Mittelteils 13 der ersten Bügelfeder 9 entweder nach oben oder nach unten, was gleichbedeutend ist mit einer Verstellung der Federvorspannung der ersten Bügelfeder 9, welche entgegengesetzt gerichtet ist zur Federvorspannung der zweiten Bügelfeder 15.The adjusting mechanism 23 for adjusting the pretension of the first bow spring 9 essentially consists of a housing 26 (cf. FIG. 1) which is fastened on the lower side of the plate 7 facing away from the first bow spring 9, specifically in the opening 14 'In the plate 7. In the housing 26 of the adjusting mechanism 23, an intermediate housing 27 is also housed with a bolt 25 mounted therein, in such a way that the intermediate housing 27 is displaceable in the axial direction relative to the bolt 25, which through the opening 14th 'Extending end of the intermediate housing 27 cooperates with the sleeve 14, in which the curved middle part 13 of the first bow spring 9 is mounted. Furthermore, this adjustment mechanism 23 has a rotary knob 24, in which the end of the bolt 25 facing away from the central part 13 of the bow spring 9 is fastened. A rotary actuation of the rotary knob 24 causes a relative displacement of the intermediate housing 27 relative to the bolt 25 and thus a change in the position of the curved middle part 13 of the first bow spring 9 either upwards or downwards, which is equivalent to an adjustment of the spring preload of the first bow spring 9, which is directed in the opposite direction to the spring preload of the second bow spring 15.

Der Verstellmechanismus 23 ist im übrigen in der Weise angeordnet, daß seine Achse schräg zur Achse des Fußgestells 1 ausgerichtet ist.The adjustment mechanism 23 is otherwise arranged in such a way that its axis is aligned obliquely to the axis of the base frame 1.

In der Fig. 3 ist noch angedeutet, daß der Sitzrahmen 28 mit einem Lochblech 42 bespannt ist, welches in Wirklichkeit den gesamten Zwischenraum zwischen den beiden Sitzrahmenschenkeln 28a und 28b flächig ausfüllt, wobei eine entsprechende Lochblechbespannung ebenfalls im Bereich des unteren Rückenlehnenrahmenteils 29 vorgesehen sein kann, und zwar insoweit, als eine Sitzbelastung auch noch in diesem unteren Rückenlehnenbereich 44 auftritt. Eine derartige Bespannung mit Lochblechen 42 bestizt gegenüber den bekannten Schalenkonstruktionen den Vorteil, daß eine sehr gut aktive Durchlüftung der gesamten Sitzfläche ermöglicht ist.In Fig. 3 is also indicated that the seat frame 28 is covered with a perforated plate 42, which in reality fills the entire space between the two seat frame legs 28a and 28b, a corresponding perforated sheet covering can also be provided in the region of the lower backrest frame part 29 , to the extent that a seat load also occurs in this lower backrest area 44. Such covering with perforated plates 42 has the advantage over the known shell constructions that very good active ventilation of the entire seat surface is made possible.

Ferner sind aus der Fig. 1 noch die beiden extremen Verschwenkstellungen zu ersehen, und zwar zum einen die Arbeitsstellung 40, in welcher der rückwärtige Bereich der Sitzfläche, d. h. in diesem Falle der untere Bereich 44 der Rückenlehne 45 am größten nach oben angehoben ist, während die Rückenlehne 45 am weitesten nach vorne geschwenkt ist. Demgegenüber ist mit der gestrichelt gezeichneten Kurve 41 die Ruhestellung angedeutet, in welcher untere Bereich 44 der Rückenlehne 45 (und damit praktisch die rückwärtige Sitzfläche) am größten nach unten gedrückt und die Rückenlehne 45 am weitesten nach hinten geschwenkt ist.Furthermore, the two extreme pivoting positions can be seen from FIG. 1, namely the working position 40, in which the rear region of the seat surface, ie in this case the lower region 44 of the backrest 45, is raised the greatest upwards, while the backrest 45 is pivoted forward most. In contrast, the broken position curve 41 indicates the rest position in which lower region 44 of the backrest 45 (and thus practically the rear seat surface) is greatest pressed down and the backrest 45 is pivoted the farthest back.

Als Kerngedanke der Erfindung wird es angesehen, drehelastische Anlenkverbindungen, insbesondere in Form von Torsionsfederelementen als Kraftspeicher, vorzusehen, durch welche jeweils eine separate Anlenkverbindung zwischen Sitz und Sitzträger einerseits und Rückenlehne und Sitzträger andererseits ermöglicht wird, während der Sitzträger selbst im wesentlichen schwenkunbeweglich an dem Fußgestell des Sitzmöbels befestigt ist.As the core idea of the invention, it is considered to provide torsionally flexible articulation connections, in particular in the form of torsion spring elements as energy stores, by means of which a separate articulation connection between the seat and seat support on the one hand and the backrest and seat support on the other hand is made possible, while the seat support itself is essentially pivotably immovable on the base frame the seat is attached.

Durch die erfindungsgemäße Ausbildung des Sitzmöbels wird sowohl eine verbesserte Verschwenkbarkeit von Sitz und Rückenlehne in die Arbeitsstellung erzielt, wobei ferner eine zusätzliche Sitzelastizität erreicht wird, insbesondere auch eine Flexibilität in seitlichen Sitzflächenbereichen, d. h. je nach Gewichtsverlagerung der auf dem Sitzmöbel sitzenden Person nach rechts oder links.The inventive design of the seating furniture achieves both an improved pivotability of the seat and backrest into the working position, with additional seat elasticity being achieved, in particular also flexibility in the lateral seat areas, ie. H. depending on the weight shift of the person sitting on the seating furniture to the right or left.

Claims (19)

  1. A seating furniture item in the form of a chair or armchair, particularly an office chair or armchair
    - with a base frame (1)
    - on which there is mounted a seat carrier (5)
    - and where both the seat (43) and also a back rest (45) are connected to the seat carrier (5)
    - with means for the synchronously coupled pivoting of seat (43) and back rest (45) in relation to the base frame (1) in each case in a common direction but with different ranges of pivoting angles,
    - the action of pivoting out of a working position in which the rear portion of the seat is raised farthest upwardly while the back rest is pivoted farthest forwardly into an inoperative position in which the rear portion of the seat is pushed farthest downwardly while the back rest is pivoted farthest rearwardly, is accomplished by the body weight of a person seated on the furniture item, whereas conversely the pivoting out of the inoperative position upwardly-forwardly into the working position is accomplished by a force storage means and
    - in which the seat carrier (5) is rigidly fixed to the base frame (1), i.e. is substantially non-pivotable,
       characterised in that
    between the seat carrier (5) and the seat (43) on the one hand and between the seat carrier (5) and the back rest (45) on the other there are in each case flexible articulating connections constituted by torsionally elastic connecting elements (9, 15) in the form of torsion spring elements.
  2. An item of seating furniture according to Claim 1,
       characterised in that
    the torsionally elastic connecting elements (9, 15) which consist of torsion spring elements serve as force storage means.
  3. An item of seating furniture according to one of Claims 1 or 2,
       characterised in that
    the torsionally resiliently connecting elements torsion spring elements (9, 15) are constructed substantially in the form of bow springs which are preferably produced from spring steel bars.
  4. An item of seating furniture according to one of Claims 1 to 3,
       characterised in that
    the torsionally resilient connecting element (first bow spring 9), which is disposed between the seat carrier (5) and the seat (43), comprises an initial spring tension which is directed in opposition to the initial spring tension of the torsionally resilient connecting element (second bow spring 15) which is disposed between the seat carrier (5) and the back rest (45).
  5. An item of seating furniture according to Claim 4,
       characterised in that
    the initial spring tension of at least one of the two torsionally resilient connecting elements (9, 15) is adjustable.
  6. An item of seating furniture according to one of the preceding Claims,
       characterised in that
    a seat frame (28) is provided for the seat (43) while a back rest frame (36) with a lower back rest frame part (29) are provided for the back rest (45) and in that the seat frame (28) has its two arms (28a, 28b) connected to the seat carrier (5) via the first bow spring (9) while the lower back rest frame part (29) has its two arms (29a, 29b) connected to the seat carrier (5) via the second bow spring (15).
  7. An item of seating furniture according to one of the preceding Claims,
       characterised in that
    the first torsion spring element for the first bow spring (9) has two free ends (10) which are in each case bent substantially parallel with the two arms (28a, 28b) and are fixed in supporting elements (11) mounted on the arms (28a, 28b) while portions (9a, 9b) which are bent over at a right-angle extend from these free ends (10) of the first bow spring (9) as far as the seat carrier (5) and are mounted for rotary movement in pivot bearing bushes provided on the seat carrier (5), a curved middle portion (13) of the first bow spring (9) and pointing towards the rear part of the seat carrier is adjacent these two pivot bearing bushes (12) and being adapted for movement in relation to the seat carrier (5).
  8. An item of seating furniture according to one of Claims 1 to 7,
       characterised in that
    the second torsion spring element or the second bow spring (15) is constructed in such a way that it has, extending parallel with the two arms (29a, 29b) of the bottom back rest frame part (29), two free ends (16) which are fixed in supporting elements (17) mounted on the two arms (29a, 29b) while there are adjacent these two free ends (16) and in each case bent over in the direction of the seat carrier (5), obliquely extending portions (19) which merge into a straight middle portion (20) of the second bow spring (15) which connects them, the said middle portion (20) being opposite the curved middle part (13) of the first bow spring (9) and being mounted for rotary movement in two pivot bearing bushes (18) mounted on the seat carrier (5).
  9. An item of seating furniture according to one of the preceding Claims,
       characterised in that
    the seat carrier (5) consists essentially of a tube (6) which is bent into a U-shape and a panel (7) filling the U-shaped space between the outer walls of the U-shaped tube (6), the two arms (8) of the U-shaped tube (6) pointing in the direction of the front seat end, each of their ends having a pivot bearing bush (12) for the first bow spring (9), while in the rear portion of the two parallel arms (8) there are respective pivot bearing bushes (18) for the second bow spring (15).
  10. An item of seating furniture according to Claim 9,
       characterised in that
    the panel (7) of the seat carrier (5) is obliquely upwardly inclined from the base frame (1), in the direction of the front end of the seat area.
  11. An item of seating furniture according to Claim 9 or 10,
       characterised in that
    the panel (7) of the seat carrier (5) has substantially in its middle portion an aperture (14') which is disposed at the height of the rear end of the curved middle part (13) of the first bow spring (9) and is associated with an adjusting mechanism for adjusting the initial tension of the first bow spring (9), the said adjusting mechanism acting on a portion of the curved middle part (13) of the first bow spring (9) which is mounted in a sleeve (14) disposed above the aperture (14').
  12. An item of seating furniture according to Claim 11,
       characterised in that
    the adjusting mechanism (23) consists essentially of a housing (26) which is fixed on the underside of the panel (7) which is remote from the bow spring (9) and accommodates elements (25, 27) adapted for movement in the axial direction in relation to each other, the said adjusting mechanism (23) furthermore comprising a rotary knob (24), actuation of which, via the elements (25, 27), produces a change in the position of the curved middle part (13) of the first bow spring (9) upwardly or downwardly and with it an adjustment of its initial spring tension which is directed in opposition to the initial spring tension of the second bow spring (15).
  13. An item of seating furniture according to one of the preceding Claims,
       characterised in that
    on the underside of the panel (7) of the seat carrier (5a) which is remote from the bow springs (9, 15) there is also an actuating linkage (21) which is mounted in bearing sleeves (22) and which serves for adjusting the height of the supporting column (2), which is for example a gas-filled spring.
  14. An item of seating furniture according to one of the preceding Claims,
       characterised in that
    a gas-filled spring (33) coupled to an actuating lever (35) is provided for interlocking whichever is the desired pivoted position of the seat (43) and back rest (45) in the pivoting range between the working position and the inoperative position, the upper end (33') of this gas-filled spring (33) being supported on an intermediate frame part (31) which connects together the two arms (29a, 29b) of the lower back rest frame part (29), while the gas-filled spring (33) has its bottom end (33") supported on the base frame (1).
  15. An item of seating furniture according to Claim 14,
       characterised in that
    in the region of its upper end (33') which is braced on the intermediate frame part (31), the gas-filled spring (33) comprises a valve (55) adapted to be operated by means of a lever mechanism (37) connected to the operating lever (35) in such a way that the valve (55) is closed in a first position of the operating lever (35) so that whatever pivoted position of the seat (43) and the back rest (45) set at that particular moment is locked while in a second position of the operating lever (35), the valve (55) is opened and thus the pivotability of the seat (43) and back rest (45) is ensured either by physical force or by the force storage means.
  16. An item of seating furniture according to Claim 15,
       characterised in that
    the lever mechanism (37) is disposed between the operating lever (35) and the valve (55) partially on the intermediate frame part (31) and partially in a cavity (31') in this intermediate frame part (31) and consists essentially of a lever arm (37') mounted to pivot on the intermediate frame part (31) and, disposed in the cavity (31') in the intermediate frame part (31), a push rod (50) one end of which is connected to the lever arm (37') via a joint (49) while there is at its other end an actuating element (51) which cooperates with a valve push rod (56) of the valve (55).
  17. An item of seating furniture according to Claim 16,
       characterised in that
    the actuating element (51) connected to the push rod (50) is substantially U-shaped and has an upper literally straight first finger (52) and a lower second finger (53) in which there are bends, these bends in the second (53) being so disposed that there is between the bends an inclined guide portion (54) cooperating with a head (57) of the valve push rod (56) and which, by reason of displacement of the push rod (50) with the actuating element (51) in the interior of the intermediate frame part (31), the valve push rod (56) is controlled and thus the valve (55) is actuated.
  18. An item of seating furniture according to one of the preceding Claims,
       characterised in that
    two arm rests (38) are provided which extend outwardly towards the back rest frame (36), the respective ends of the arm rests (38) being connected to the seat frame or back rest frame by corresponding pivot joints (e.g. 39).
  19. An item of seating furniture according to one of the preceding Claims,
       characterised in that
    the seat frame (28) and at least the lower back rest frame part (29) are respectively covered by perforated plates (42).
EP88120948A 1988-04-12 1988-12-15 Sitting furniture Expired - Lifetime EP0341344B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3812117 1988-04-12
DE3812117 1988-04-12
CA000613469A CA1316091C (en) 1988-04-12 1989-09-27 Seating furniture

Publications (3)

Publication Number Publication Date
EP0341344A2 EP0341344A2 (en) 1989-11-15
EP0341344A3 EP0341344A3 (en) 1990-03-28
EP0341344B1 true EP0341344B1 (en) 1993-03-24

Family

ID=46489539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120948A Expired - Lifetime EP0341344B1 (en) 1988-04-12 1988-12-15 Sitting furniture

Country Status (4)

Country Link
EP (1) EP0341344B1 (en)
CA (1) CA1316091C (en)
DE (1) DE3879679D1 (en)
ES (1) ES2039580T3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IE66531B1 (en) * 1991-05-21 1996-01-24 Ashfield Eng Co Wexford Ltd A chair tilting mechanism
CA2204579C (en) * 1997-05-06 2000-10-17 Broda Enterprises Inc. Reclining chair
CH704814A2 (en) * 2011-04-12 2012-10-15 Vitra Patente Ag Chair mechanism with synchronously adjustable alignment of the backrest and seat.
EP3192398B1 (en) * 2016-01-15 2019-12-11 himolla Polstermöbel GmbH Seat or lounger
CH715343A1 (en) 2018-09-18 2020-03-31 Krob Andreas Swivel chair.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3545810A (en) * 1968-09-23 1970-12-08 Keystone Consolidated Ind Inc Locking means for chair controls
IT1161498B (en) * 1983-07-12 1987-03-18 Castelli Spa CHAIR
DE8607194U1 (en) * 1986-03-15 1986-04-30 Drabert Söhne Minden (Westf.), 4950 Minden Seating

Also Published As

Publication number Publication date
EP0341344A3 (en) 1990-03-28
EP0341344A2 (en) 1989-11-15
DE3879679D1 (en) 1993-04-29
CA1316091C (en) 1993-04-13
ES2039580T3 (en) 1993-10-01

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