EP1039816B1 - Mecanique de fauteuil - Google Patents

Mecanique de fauteuil Download PDF

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Publication number
EP1039816B1
EP1039816B1 EP99949277A EP99949277A EP1039816B1 EP 1039816 B1 EP1039816 B1 EP 1039816B1 EP 99949277 A EP99949277 A EP 99949277A EP 99949277 A EP99949277 A EP 99949277A EP 1039816 B1 EP1039816 B1 EP 1039816B1
Authority
EP
European Patent Office
Prior art keywords
rotation
axis
chair
seat
support
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
EP99949277A
Other languages
German (de)
English (en)
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EP1039816A1 (fr
Inventor
Egon Bräuning
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.)
Vitra AG
Original Assignee
Vitra Patente AG
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Filing date
Publication date
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Publication of EP1039816A1 publication Critical patent/EP1039816A1/fr
Application granted granted Critical
Publication of EP1039816B1 publication Critical patent/EP1039816B1/fr
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
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • 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
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/023—Reclining or easy chairs having independently-adjustable supporting parts the parts being horizontally-adjustable seats ; Expandable seats or the like, e.g. seats with horizontally adjustable parts
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
    • A47C1/03274—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs of torsion type
    • 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
    • A47C7/38—Support for the head or the back for the head

Definitions

  • the invention relates to a chair mechanism, in particular for a swivel chair Office chair with a gas spring arranged vertically in the base for adjustability the height of the seat.
  • the chair mechanics causes that with the back Incline the back support, which the user does by shifting weight initiated, the seat plate is lowered synchronously.
  • This mechanism allows the user to get out of the upright posture by shifting body weight backwards and pushing against the cushioned cushioned backrest in a reclined relaxation position - e.g. for a long call - to go.
  • the seat follows reclining backrest so that the user leans backwards, relieving rest position results.
  • gas springs are more important for the function of a chair mechanism Importance.
  • gas springs which for Improvement of the kinematics are often coupled with helical compression springs (e.g. CH-A-629 945).
  • gas pressure springs have several disadvantages; they increase The cost of the entire chair is substantial and must be achieved a favorable movement sequence coupled with mechanical springs be what makes the construction more expensive and complicated.
  • WO-A-92/03072 has therefore been proposed for Suspension during the synchronous movement a mechanical spring in the form of a Insert torsion bar.
  • WO-A-93/25121 describes the use of a rubber spring with an embedded one Steel core and an outer steel jacket proposed, being the inner steel core is subjected to torsion.
  • the use of such Rubber spring brings too little stiffness in the normal position of the seat whereby this sitting position does not have the desired stability to the full extent. This does not succeed with the conceived positioning of the Rotation axes, i.e. an approximately central, swing-shaped suspension of the seat plate and the articulation of the seat plate in the rear area.
  • the invention is therefore based on the object of creating a mechanism with the one sitting position that is largely stress-free and leaned back with a wide opening angle between the seat and back surface as permanent working posture is designed.
  • the Relaxed, reclined seating position should the mechanics as well as the whole Chair structure gives the user a certain amount of mobility in the chair enable and provide noticeable support for the shoulder.
  • the seat and the backrest should be adjustable in height.
  • The is also desired Adjustable seat depth and lumbar support intensity as well as a adjustable neck support.
  • the chair should be rational and closed cheap costs can be produced.
  • the construction enable a design that corresponds to the taste of the time.
  • the chair mechanism of the seat rests on a base frame with a foot resting on the floor - usually a standardized five-armed star base - and a vertically arranged gas spring with a telescopically extendable piston rod for height adjustment of the chair.
  • the seat with the seat support attached at the bottom is placed as a structural unit on the piston rod.
  • the horizontal main axis of rotation with the torsion spring positioned thereon, preferably a rubber spring, extends through the seat support.
  • the back support which can be pivoted about the main axis of rotation against the resistance of the torsion spring, acts on the torsion spring.
  • the chair also has a seat plate for receiving a seat cushion with the possible interposition of a cushion carrier.
  • the seat plate is articulated on the one hand on a horizontal rear axis of rotation on the back support and on the other hand connected to a joint on a horizontal front axis of rotation.
  • the joint is connected to the seat support on a horizontal, fixed axis of rotation.
  • the back support and seat plate perform synchronous position changes when swiveling between a vertical position and an inclination position.
  • the rear axis of rotation - as a connection between Seat plate and back support -, is close to the rear edge of the seat plate, whereby the rear axis of rotation in the radius and pitch circle around the main axis of rotation is pivotable.
  • the main axis of rotation is between and below the front and the rear axis of rotation.
  • the fixed axis of rotation should preferably lie above the plane of the main axis of rotation and, in the vertical position of the chair, the front axis of rotation should be approximately perpendicular to the fixed axis of rotation.
  • the rear axis of rotation In the maximum inclination position , the rear axis of rotation should be able to be lowered at least close to the plane of the main axis of rotation.
  • the front axis of rotation In the vertical position of the chair, the front axis of rotation is in front of the main axis of rotation in front of the fixed axis of rotation. Starting from this chair position, the horizontal distance between the fixed axis of rotation and the main axis of rotation and between the main axis of rotation and the rear axis of rotation is in a size ratio of 1: 2 in some areas.
  • the seat plate In the maximum inclination position, the seat plate is inclined in the range of 15 °.
  • the conventional torsion spring consists of the inner steel core, the rubber layer firmly attached to the steel core and the one on the Rubber layer of firmly attached outer steel jacket.
  • the driver bar is with its outer ends in the polygonal free ends of the forked back carrier with two support arms.
  • On the outer steel jacket of the torsion spring is to adjust it Preload an adjustable tension element attached.
  • the parallel spring is arranged on the front axis of rotation and is supported as Coil spring with one end below the seat plate while the other End of the coil spring is fixed to a preload pin.
  • the preload bolt lies on the front axis of rotation, is firmly inserted into the joint and is rotatably inserted in the front on the underside of the seat plate Joint approaches. Joint, preload bolt, coil spring and the pair Joint approaches are available twice and are symmetrical to the torsion spring arranged.
  • the back support has between its two support arms one below the Seat plate arranged bearing pan through which the rear axis of rotation extends and on the, stuck on an axis rod, on the underside of the seat plate existing rear joint approaches are articulated. Above the seat plate combine both support arms in a U-shaped guide that the height-adjustable recording of a back support is used.
  • the seat support exists first from the middle sleeve body with the continuous main axis of rotation to accommodate the torsion spring.
  • the Push-on flange with its tapered bore running on the vertical axis to be placed on the piston rod of the gas spring.
  • the bearing flange starts.
  • This has one on the fixed axis of rotation and through hole running parallel to the main axis of rotation Inclusion of an axle rod on which the joints on both sides of the bearing flange are arranged.
  • the torsion spring has a recess in the sleeve body.
  • the back support initially consists of the lower base spar for insertion into the guide on the back support and one on the base spar upward extending central spar.
  • Two symmetrical between base spar and The central strut is arched and horizontally extending lumbar extensions are used for Hold and clamp a flexible back shell.
  • Above the central stringer two Y-shaped support arms go off.
  • the free ends of the Lumbar brackets have through holes for attaching one Back shell on, while the ends of the support arms in on the back shell existing pockets are inserted.
  • An adjustable incline Headrest can be attached to the backrest.
  • the tension of the Back shell in the lumbar area can be placed in the lumbar extension arranged eccentrics can be set variably.
  • On the user side is the back shell is completely covered with a cover on the back Partial side, with a trained pocket and to fix the cover Quick fasteners are provided.
  • the headrest can be in a desired one Set angle of attack and selectable height.
  • the essential advantages of the chair mechanism according to the invention are the large opening angle between the seat plate and the backrest in the inclined position , the adjustable responsiveness of the chair in the event of weight shifting by the user, and the soft, flexible seat shell, so that the relaxing inclined position can be assumed as a continuous working posture.
  • the lumbar support which can be adjusted in intensity
  • the selectable height adjustment of the backrest and the headrest which can be variably adjusted in the angle of attack, result in a high level of seating comfort, which is particularly useful when working with a keyboard and at VDU workstations.
  • the front edge of the seat plate lowers and the entire seat travels deeply backwards.
  • the optimal seat depth gives the user effective support for his back and shoulders without losing eye contact with his screen and straining the neck muscles.
  • the preferably mesh-like covering of the back shell - and possibly also the head cushion and armrests - creates a pleasant seating climate and a decorative effect.
  • the entire chair is divided into two levels, the base U known per se and the seat S placed on the base U , which embodies the invention.
  • the base frame U consists of a typical five-armed star base 1 with rollers 11 attached to the ends of the arms 10 , which rest on the floor.
  • the center of the star base 1 is formed by a sleeve piece 12 in which a gas spring 13 is inserted vertically.
  • a telescopically extendable piston rod 14 protrudes from the gas spring 13 on the axis A , on which the seat support 2 , which is the base part of the entire seat S , is placed.
  • the seat S can be rotated about the axis A and its height can be adjusted with the extension or retraction of the piston rod 14 on the axis A.
  • the seat support 2 consists of a middle sleeve body 20 , a rearward projecting plug-on flange 21 and a front-mounted bearing flange 22.
  • the horizontal main axis of rotation A1 extends through the sleeve body 20 , on which a conventional rubber spring 3 is received.
  • the vertical axis A runs through the push-on flange 21 and an axis of rotation A2 parallel to the main axis of rotation A1 runs through the bearing flange 22 .
  • the chair is also composed of a back support 4, a backrest 5, a headrest 6, a back shell 7, a seat plate 8 and the armrests, not shown, which can be used as an option.
  • a cushion support 80 is arranged on the seat plate 8 for the immediate reception of the seat cushion 801 .
  • the seat support 2 with the inserted rubber spring 3 are positioned below the seat plate 8 , the main axis of rotation A1 being quasi parallel to the front edge 810 of the seat plate 8 .
  • the back support 4 On the main axis of rotation A1 , the back support 4 is fastened, which, with its two support arms 40, attaches to both sides of the rubber spring 3 in a fork-like manner and extends upward from below the seat plate 8 at a distance from the rear edge 811 of the seat plate 8 .
  • the support arms 40 Above the level of the seat plate 8 , the support arms 40 unite to form a guide 41 in which the height-adjustable back support 5 is held with its lower base beam 50 .
  • the set height is fixed by means of a clamping screw 42 passing through the guide 41 of the back support 4 .
  • two lumbar cantilevers 51 extend symmetrically, approximately horizontally and forming an arc, which are attached with their outer ends to the back shell 7 in the lower lumbar region 70 thereof.
  • the lumbar extension 51 encompasses the lumbar region 70 of the back shell 7, wherein vertical expansion slots could be provided in the lumbar region 70 to increase the elasticity of the back shell 7 .
  • the back support 5 has the shape of a letter with a lower central spar 52 and two wing-like support arms 53 , the ends of which are inserted into pockets 710 , which are located in the upper corners on the rear side of the back shell 7 .
  • the vertical strut 60 of the headrest 6 is attached. At the top of the vertical strut 60 , a head cushion 61 facing the back of the user's head is held, the inclination of the vertical strut 60 being adjustable.
  • a cover 73 is provided, which has a pocket 730 facing backwards and open at the bottom.
  • the lower edge 72 of the back shell 7 is inserted into this pocket 730 up to approximately the lumbar region 70 .
  • the cover 73 completely spans the front of the back shell 7 and has an upper part 731 for folding over the upper edge 71 and two lateral parts 732 for folding over both side edges of the back shell 7 .
  • Recesses 733 run between the upper part 731 and the two lateral parts 732 , so that, when folded over, the pockets 710 provided on the back shell 7 remain accessible for inserting the ends 530 of the support arms 53 .
  • a quick-action connection 734 for example a hook or Velcro connection - is provided, which engages under the support arms 53 .
  • the lateral parts 732 also do not span the ends of the lumbar brackets 51 fastened to the back shell 7 , as a result of which the middle field of the back shell 7 remains uncovered at the rear. With detached quick- connect connections 734 , the cover 73 can therefore be quickly fitted onto the back shell 7 during assembly or removed just as quickly for the purpose of cleaning or renewal.
  • the base frame U Disassembled into larger assemblies, you can see the base frame U with the star foot 1 and the gas spring 13 inserted vertically and centrally for the height adjustment of the seat S. From the seat S you can see the seat plate 8 below which the essential part of the chair mechanism is located and after protruding back support 4 is attached.
  • the seat plate 8 is placed on the cushion plate 80 which is adjustable in the seat depth and which carries the seat cushion 801 and a cover 802 spanning it.
  • the back shell 7 and the headrest 6 with the head cushion 61 and the vertical strut 60 which extends downward for attachment to the backrest 5 . It is practical and decorative to provide the head cushion 61 with a quickly exchangeable cover 610 , which is optically effective, for example a mesh covering.
  • the chair can be equipped with laterally arranged armrests 65 , the support arms 66 of which are arranged in a bow-shaped manner and are preferably also attached below the seat plate 8 .
  • the support arm 66 has an adjusting device 67 for adjusting the height and the inclination of the inserted armrests 68.
  • the armrest 68 has a vertical support strut 69 projecting through the adjusting device 67 , a support plate 680 and the cushion 681 arranged thereon.
  • This cushion 681 is preferably provided with a cover 682 , for example also a decorative mesh covering.
  • a, box-shaped arranged upwardly open bearing cup 43 in its two side walls 430 - are two mutually aligned holes 431 provided on the - these are on the carrier arms 40 at Axis of rotation A4 are positioned.
  • a front and a rear transverse wall 432, 433 extend between the side walls 430 .
  • the rear joint projections 821, which originate from the seat plate 8 project into the bearing socket 43 .
  • An axle rod 44 is pushed through the bores 431 in the bearing socket 43 and in the complementary bores present in the joint extensions 821 , so that the seat plate 8 is rotatably fastened to the back support 4 on the axis A4 .
  • a lateral screw connection 440 which is supported from the outside against the side walls 430, is used .
  • the front transverse wall 432 faces the free ends of the support arms 40 through which the main axis of rotation A1 runs, while the rear transverse wall 433 lies opposite the front transverse wall 432 and faces the guide 41 of the back support 4 .
  • a recess 435 is worked into the rear transverse wall 433 from above in order to receive a pretensioning wedge 45 (see FIG. 3B), the function of which will be explained later.
  • the free ends of the support arms 40 each have a continuous inner polygon 401 on the main axis of rotation A1 , a driver rod 46 made of polygonal profile being inserted in a rotationally stable manner through both inner polygon 401 and the rubber spring 3 .
  • the driver rod 46 is fastened, for example, with a screw connection 460 , which is supported laterally from the outside against the support arms 40 .
  • the U-profiled guide 41 which is open towards the seat S , has a through hole 410 and, complementarily thereto, an elongated hole 500 with a vertical extension is present in the base spar 50 of the back support 5 .
  • the height adjustment of the back support 5 can thus take place within the elongated hole 500 .
  • the lumbar extensions 51 which extend to both sides of the back support 5 , have through holes 510 at their free ends.
  • two eccentrics 55 are provided, which consist of a rotary knob 550 to be gripped , a cylinder section 551 which can be inserted into the through bores 510 and a clamping bolt which projects eccentrically through the cylinder section 551 .
  • the eccentric 55 By turning the eccentric 55 , the distance between the two clamping bolts is changed and the tension in the lumbar region 70 of the back shell 7 can thus be adjusted. With softer tension, the lumbar region 70 of the back shell 7 becomes more resilient for the user.
  • the clamping bolts engage in the back shell 7 , so that the back support 5 and the back shell 7 are firmly connected to one another.
  • the free ends 530 of the support arms 53 could also have through holes in order to be able to use screws for fastening to the back shell 7 .
  • the ends 530 are advantageously inserted into pockets 710 , which are located on the rear side of the back shell 7 , in the upper corners.
  • a quickly exchangeable, decorative cover 73 for example a net. Due to the tension of the cover 73 , it does not rest on the central region of the back shell 7 , which is concavely curved, as seen by the user, without load. Thus, the cover 73 lifts off the back shell 7 as soon as the user no longer exerts pressure. This allows both the back shell 7 and the cover 73 to breathe and release absorbed moisture. In addition, there is a decorative optical effect.
  • the side walls 430 of the bearing pan 43 are contoured in the manner of a ledge, so that the support arm 66 of the armrest 65 placed there is given a particularly good hold by positive locking and stop.
  • a double-angled lever 803 is arranged in the seat plate 8 , the handle part 804 of which protrudes laterally for actuation by the user and the plate-shaped locking part 805 comes to rest in a recess 812 in the seat plate 8 .
  • Beneath the locking part 805 is a spring tongue 806, which is supported on the seat plate 8 and thus presses the locking part 805 upwards with pretension.
  • a setting range could, for example, comprise 50 mm in 5 steps of 10 mm each.
  • the seat plate 8 has laterally projecting, cut-down edges 814 , which are underlaid by the upholstered support 80 with angled claws 808 arranged on its underside, so that the support 80 is guided in the seat depth on the seat plate 8 .
  • the cushion support 80 has a stop edge 809 on its underside, which abuts the front edge 810 of the seat plate 8 when the cushion support 80 is at the maximum rear position.
  • two stop cams 813 are provided on the upper side of the seat plate 8 , near the rear edge 811 thereof, against which the fully extended cushion carrier 80 abuts (see FIGS. 3A and 3B).
  • the seat plate 8 according to FIGS. 3C and 3D is a simplified version compared to FIGS. 3A and 3B without the possibility of adjusting the seat depth.
  • the rubber spring 3 has the shape of a roller and is constructed in three layers.
  • An innermost steel core 30 has a polygonal passage 300, for example hexagonal, located on the main axis of rotation A1 for the positive reception of the driving rod 46 .
  • the driver rod 46 inserted in the rubber spring 3 is seated on both sides in the inner polygon 401 at the free end of the support arms 40 in a rotationally stable manner .
  • a rubber layer 31 is applied to the steel core 30 and is surrounded by an outer steel jacket 32 .
  • Carriers 320 protrude from the steel jacket 32 into the rubber layer 31 .
  • This rubber spring 3 is located in the sleeve body 20 of the seat support 2, and in order to reduce the friction with the inner wall of the sleeve body 20, 32 sliding rings 33, for example made of plastic, can be applied to the steel jacket.
  • the plug-on flange 21 pointing rearward on the seat support 2 has a vertical conical bore 210 on the axis A, into which the upper part of the piston rod 14 which can be extended from the gas spring 13 is inserted.
  • the valve rod 15 protrudes axially from the piston rod 14 , and when it is actuated, depending on the load on the seat S , the piston rod 14 extends or retracts.
  • the valve rod 15 is actuated in a conventional manner via a shift lever, not shown, which is usually provided under the seat plate 8 .
  • the bearing flange 22 through which the through-bore 220 extends on the axis of rotation A2, is arranged facing the plug-in flange 21 and points forward from the sleeve body 20 .
  • the sleeve body 20 has a recess 200 for inserting a tension element 23, which is fastened on the outer steel jacket 32 , for example by a screw connection 230 .
  • a tension bolt 24 is suspended in the tension element 23 , the tension bolt 24 projecting through the bearing flange 22 and a handwheel 26 supported on the bearing flange 22 being screwed onto the tension bolt 24 .
  • the tension element 23 is pulled towards the bearing flange 22 and the rubber spring 3 is thus preloaded more.
  • the rotatable joints 9 are arranged, which overlap the axis of rotation A3 and there are rotatably connected to the front joint extensions 820 on the underside of the seat plate 8 .
  • the joint projections 821 at the rear on the underside of the seat plate 8 are articulated on the axis of rotation A4 in the bearing socket 43 , which sits between the support arms 40 of the back support 4 .
  • the driver rod 46 inserted in the rubber spring 3 is seated on both sides in the inner polygon 401 at the free end of the support arms 40 in a rotationally stable manner.
  • the seat plate 8 has a depression 83 consisting of two sections 830 , 831 .
  • a recess section 830 is worked in from above, which, viewed from the front edge 810 of the seat plate 8 , lies in front of the bearing socket 43 .
  • a recessed section 831 which is worked in from below, adjoins the recessed section 830 and is positioned above the bearing socket 43 between the joint attachments 821 .
  • a locking slide can be used 84, into the recess portion 830 by a spring 86 loaded always partially in the recessed portion 831 inside is slid, so that the locking slide 84, the seat plate 8 by resorting to the front transverse wall 432 of the bearing cup 43 touches (FIG 3C shows the unlocked state).
  • a return mechanism 85 attaches to the locking slide 84 and can be actuated with a switching lever 87 in order, if necessary, to pull the locking slide 84 back against the action of the spring 86 into the unlocked position shown in FIG. 3C. Only now can the back support 4 and back support 5 be moved backwards into the tilt position.
  • the locking slide 84 remains in the retracted state by exceeding a dead center of the return mechanism 85 , ie the back support 4 remains movable.
  • Pre-pivoting of the back support 4 about the main axis of rotation A1 when the seat S is completely relieved is prevented by the pretensioning wedge 45 , which is placed in the recess 435 on the rear transverse wall 433 of the bearing socket 43 and presses against the seat plate 8 from below.
  • FIG. 3D also shows that bevels are provided on both sides near the rear edge 811 of the seat plate 8 ; attach the armrests here too.
  • there are two further inner joint extensions 822 which are also on the axis of rotation A3 and are each offset in the direction of the seat support 2 , so that the joint extensions 820 are on the outside, the two inner joint extensions 822 face each other and each distance from the associated outer joint attachment 820 .
  • a joint 9 is directed with its joint leg 90 pointing towards the axis of rotation A3 , in which there is a through hole 900 on the axis of rotation A3 .
  • Bores aligned with the through bore 900 are also provided lying on the axis A3 in the joint projections 820 , 822 , as a result of which a pretensioning bolt 88 can be used as the axis on the axis of rotation A3 , which can be inserted from the joint leg 90 - with its head 880 firmly seated therein - through the extends two associated joint approaches 820 , 822 .
  • the pretensioning pin 88 has a transverse slot 882.
  • a coil spring 89 On the pretensioning pin 88 inserted, between the pair of articulated lugs 820 , 822, there is a coil spring 89 , which has a bend 890 extending over the spring diameter at one end and a tangential bend 891 at the opposite end having.
  • the tangential bends 891 of the two coil springs 89 each rest on the underside of the seat plate 8 , while the bends 890 extending over the spring diameter are in the transverse slot 882 of the pretensioning bolts 88 .
  • the pretensioning wedge 45 has not yet been inserted into the bearing socket 43 , so that the back support 4 can be set virtually negatively about the fixed main axis of rotation A1 in the direction of the front edge 810 of the seat plate 8 up to the assembly position P 0 .
  • This movement is followed synchronously by the seat plate 8, which is lowered in the area of the front edge 810 and raised in the area of the rear edge 811 .
  • the rubber spring 3 and the coil springs 89 can be mounted relaxed.
  • the axis of rotation A2 lies above the level of the main axis of rotation A1.
  • the maximum negative angle of attack is reached when the recess 435 in the bearing socket 43 abuts with its upper edge near the rear edge 811 against the underside of the seat plate 8 .
  • the chair With the insertion of the pretensioning wedge 45 , the chair is brought into the vertical position P 1 , ie the back support 5 mounted on the back support 4 is approximately vertical and the seat plate 8 has an approximately horizontal position. Since it is fixed, the position of the main axis of rotation A1 and the axis of rotation A2 on the bearing flange 22 of the seat support 2 remains unchanged. The rubber spring 2 and the coil springs 89 are now preloaded. By placing the back support 5 vertically, the back support 4 pivots about the main axis of rotation A1, whereby the axis of rotation A4 lowers.
  • the joints 9 pivot about the axis of rotation A2 and the joint legs 90 are positioned approximately perpendicularly, so that the axis of rotation A3 is now slightly raised approximately perpendicularly above the axis of rotation A2 .
  • the joint legs 90 are preferably slightly inclined, so that the axis of rotation A3 precedes the axis of rotation A2 in the direction of the main axis of rotation A1 . This allows the user to reach the inclination position P 2 more comfortably by shifting weight without having to brace against the back support 5 .
  • the retracted locking slide 84 allows the seat S to be adjusted into the tilt position P 2 if the user shifts weight sufficiently .
  • the back carrier 4 rotates about the main axis of rotation A1, the axis of rotation A4 lowers to a maximum of the level of the main axis of rotation A1 .
  • the maximum inclination of the seat S in the inclination position P 2 is limited by the seating of the seat plate 8 in the region of the lower recess section 831 on the front transverse wall 432 of the bearing socket 43 , which acts as a stop in the end position.

Landscapes

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

Claims (16)

  1. Mécanique de fauteuil pour un fauteuil composé deun châssis de base (U) avec un pied se reposant sur le sol (1) et un ressort à gaz (13) intérieurement incorporé sur un axe vertical (A) avec une tige-piston (14) à coulissement hydraulique pour régler la hauteur du fauteuil et un siège (S) avec un support de siège (2) disposé en dessous, posé sur la tige-piston (14), tandis que:
    a) en travers du support de siège (2) s'étend un axe de rotation principal, horizontal (A1) sur lequel est disposé un ressort mécanique à torsion (3) auquel se rattache un support de dossier (4) pivotant autour de l'axe de rotation principal (A1) et contre la résistance du ressort à torsion (3);
    b) une plaque de siège (8) recevant un rembourrage de siège (801) est d'une part accouplée à un axe de rotation horizontal (A4) du support de dossier (4) et, d'autre part, fixée sur un axe de rotation horizontal (A3) à l'aide d'une articulation (9) reliée au support de siège (2) sur l'axe de rotation horizontal (A2) ce qui, par balancement du support de dossier (4) entre une position verticale et une position inclinée du fauteuil, entraíne un changement de position synchrone de la plaque de siège (8), caractérisé par ce que
    c) parallèlement au ressort à torsion (3) et avec un effet se rajoutant à la résistance du ressort à torsion (3) un autre ressort mécanique (89) est prévu; et
    d) les axes de rotation (A1 à A4) en dessous de la plaque de siège (8) sont positionnés comme suit:
    da) l'axe de rotation avant (A3), relie la plaque de siège (8) et l'articulation (9), près du bord avant (810) de la plaque de siège (8), l'axe de rotation avant (A3) étant orientable en son rayon et cercle primitif autour de l'axe de rotation fixe (A2) qui relie l'articulation (9) et le support de siège (2);
    db) l'axe de rotation arrière (A4), relie la plaque de siège (8) et le support du dossier (4), près du bord arrière (811) de la plaque de siège (8), l'axe de rotation arrière (A4) étant orientable en son rayon et cercle primitif autour le l'axe de rotation principal (A1); et
    dc) l'axe de rotation principal (A1) est en dessous et entre les axes de rotation avant et arrière (A3,A4).
  2. Mécanique de fauteuil selon revendication 1 caractérisée par ce que
    a) l'axe de rotation fixe (A2) se situe au-dessus du niveau de l'axe de rotation principal (A1);
    b) en position verticale du fauteuil, l'axe de rotation avant (A3) se tient à peu près à la verticale au-dessus de l'axe de rotation fixe (A2); et
    c) en position inclinée maximale, l'axe arrière (A4) se laisse rabaisser au moins jusque près du niveau de l'axe de rotation principal (A1).
  3. Mécanique de fauteuil selon revendication 1 ou 2, caractérisée par ce que
    a) en position verticale du fauteuil, l'axe de rotation avant (A3) par rapport à l'axe de rotation principal (A1) se situe avant l'axe de rotation fixe (A2);
    b) en position verticale du fauteuil, l'écart horizontal entre l'axe de rotation fixe (A2) et l'axe de rotation principal (A1) ainsi que l'écart horizontal entre l'axe de rotation principal (A1) et l'axe de rotation arrière (A4) se situent dans un rapport de grandeur de l'ordre de 1 : 2; et
    c) en position inclinée maximale, la plaque de siège (8) présente une inclinaison de l'ordre de 15°.
  4. Mécanique de fauteuil selon revendication 1, caractérisée par ce que
    a) le ressort à torsion (3) consiste en:
    aa) une âme d'acier (30),
    ab) une couche de caoutchouc (31) enrobant l'âme d'acier (30), et
    ac) une enveloppe d'acier externe (32) solidement appliquée sur la couche de caoutchouc (31); tandis
    b) qu'à travers l'âme d'acier (30), appuyée sur l'axe de rotation principal (A1), existe un passage polygonal (300) dans lequel passe une barre d'entraínement (46) profilée, complémentaire;
    c) la barre d'entraínement (46) rentre avec ses extrémités dans les extrémités libres à encoche polygonale (401) des deux branches porteuses (40) du support de dossier (4) conçu en forme de fourche; et
    d) un élément de traction réglable (23) est fixé sur l'enveloppe d'acier externe (32) pour régler la pré-tension du ressort à torsion (3).
  5. Mécanique de fauteuil selon revendication 1, caractérisée par ce que
    a) l'autre ressort mécanique (89) est disposé sur l'axe de rotation avant (A3) et qu'il s'appuie comme ressort hélicoïdal (89) avec une extrémité (891) en dessous de la plaque de siège (8) tandis que l'autre extrémité (890) du ressort (89) est fixée à un boulon de pré-tension (88); et que
    b) le boulon de pré-tension (88), placé sur l'axe de rotation avant (A3) est solidement engagé dans l'articulation (9) et rentre dans les embases avant (820,822) de l'articulation sous la plaque de siège (8) de sorte qu'il peut tourner; tandis que
    c) l'articulation (9), les boulons de pré-tension (88), les ressorts hélicoïdaux (89) et les embases d'articulation (820,822) existant deux par deux, sont tous disposés symétriquement par rapport au ressort à torsion (3).
  6. Mécanique de fauteuil selon revendication 1 ou 4, caractérisée par ce que le support de dossier (4)
    a) comporte, entre ses deux branches porteuses (40), sous la plaque de siège (8), une semelle d'appui (43) à travers laquelle s'étend l'axe de rotation arrière (A4) et sur laquelle sont accouplées les embases arrières d'articulations (821) encastrées sur une tige axiale (44), en dessous de la plaque de siège (8); et
    b) au-dessus de la plaque de siège (8) les deux branches porteuses (40) aboutissent à un guide en U (41) servant à recevoir un support de dossier (5) réglable en hauteur.
  7. Mécanique de fauteuil selon revendication 1 ou 4, caractérisée par ce que le support de siège (2) consiste en:
    a) un corps creux médian (20) avec axe de rotation principal (A1) qui le traverse pour recevoir le ressort à torsion (3),
    b) une bride rapportée (21) fixée à l'arrière au corps creux (20), avec alésage conique (210) dans le sens de l'axe vertical (A) pour recevoir la tige-piston (14) du ressort à gaz (13), et
    c) une bride à palier (22) fixée à l'avant au corps creux (20) avec un alésage traversant (220) dans l'axe de rotation fixe (A2) et parallèlement à l'axe de rotation principal (A1) destiné à recevoir une tige axiale sur laquelle sont disposées les articulations (9) des deux côtés de la bride à palier (22); tandis que
    d) le corps creux (20) comporte une encoche (200) pour mettre l'élément de traction (23) sur l'enveloppe d'acier externe (32) du ressort à torsion (3).
  8. Mécanique de fauteuil selon revendication 8, caractérisée par ce que
    a) le support de dossier (5) consiste en
    b) un longeron de base inférieur (50) à insérer dans le guide (41) du support de dossier (4),
    c) un longeron médian (52) prolongeant le longeron de base inférieur (50) et s'étendant vers le haut,
    d) deux bras lombaires (51) horizontaux et courbes, symétriquement disposés entre le longeron de base (50) et le longeron médian (52) pour maintenir et tendre une coque dorsale élastique (7), et
    e) deux bras renforçateurs (53) partant du haut du longeron médian (52) et s'ouvrant en Y; tandis que
    f) les extrémités libres des bras lombaires (51) comportent des alésages traversants (510) pour y fixer la coque dorsale (7);
    g) les bras renforçateurs (53) ont des extrémités libres (530) insérées dans des poches (710) disposées au dos de la coque dorsale (7) de préférence aux deux angles supérieurs; et
    h) sur le dossier (5) est fixé un appuie-tête (6) d'inclinaison et de hauteur réglables.
  9. Mécanique de fauteuil selon revendication 8, caractérisée par ce que les extrémités libres des bras lombaires (51) comportent dans leurs alésages traversants (510) des excentriques (55) à tourner pour régler la tension de la coque dorsale (7) en sa zone lombaire (70), et dont les boulons de tension disposés de manière excentrique rentrent dans la coque dorsale (7).
  10. Mécanique de fauteuil selon revendication 9, caractérisée par ce que
    a) les excentriques (55) sont munis d'un bouton rotatif (550) auquel se rajoute une partie cylindrique coaxiale (551) destinée à être insérée dans l'un des alésages traversants (510):
    b) le boulon de tension disposé de manière excentrique ressort à travers l'excentrique (55);
    c) le boulon de tension sert également de vis de maintien en se vissant dans la coque dorsale (7).
  11. Mécanique de fauteuil selon revendication 8, caractérisée par ce que
    a) la coque dorsale (7) est conçue dans un matériau élastique et souple;
    d) b) peut avoir des fentes d'élongation dans sa zone lombaire (70); et
    e) c) peut être tendue d'un revêtement (73), au moins sur la face d'utilisation.
  12. Mécanique de fauteuil selon revendication 11, caractérisée par ce que
    a) le revêtement (73) est semi-transparent et de préférence ajouré et que la coque dorsale (7) est tendue sur la face d'utilisation et, sans charge, se soulève partiellement de la surface de la coque dorsale (7) pour améliorer la respiration de l'assise, et présente:
    ba) en bas, une poche (730) s'ouvrant vers le haut pour y insérer la partie inférieure de la coque dorsale (7),
    bb) en haut, une partie supérieure (731) à rabattre par dessus le bord supérieur (71) de la coque dorsale (7),
    bc) de chaque côté, une partie latérale (732) à rabattre par dessus les flancs de la coque dorsale (7),
    bd) entre la partie supérieure (731) et les parties latérales (732), de part et d'autre, une encoche (733) pour laisser passer les deux bras renforçateurs (53) fixés à la coque dorsale (7); et
    be) des fermetures rapides entre la partie supérieure (731) et les parties latérales (732), qui prennent en dessous des bras renforçateurs (53).
  13. Mécanique de fauteuil selon revendication 8, caractérisée par ce que
    a) l'appuie-tête (6) se compose d'un montant (60) et d'un repose-tête rembourré (61);
    b) un élément d'arrêt (62) est prévu pour fixer le montant (60) de l'appuie-tête (6) au support de dossier (5); et que
    c) le repose-tête (61) est muni d'un revêtement (610) semi-transparent, de préférence ajouré.
  14. Mécanique de fauteuil selon revendication 1, caractérisée par ce que le blocage du siège (S) en position verticale (P1 ) se fait au moyen d'un taquet de verrouillage (84) tendu par un ressort (86), disposé dans la plaque de siège (8).
  15. Mécanique de fauteuil selon revendication 1, caractérisée par ce que le réglage du siège (S) en position inclinée se fait au moyen
    a) d'un levier (803), maintenu sous pré-tension par un élément-ressort (806) disposé dans la plaque de siège (8); et
    b) d'éléments d'arrêt (807) associés au levier (803) ainsi que d'une grille (800) complémentaire placée en dessous du porte-rembourrage (80) qui restent encliquetés quand ils ne sont pas actionnés, bloquant le déplacement du porte-rembourrage (80) contre la pression de l'élément-ressort (806), mais pouvant être dégagés les uns des autres.
  16. Mécanique de fauteuil selon revendication 15, caractérisée par ce que
    a) l'élément-ressort (806) est une lame élastique (806) qui se soulève du levier (803) et va s'appuyer contre la plaque de siège (8);
    b) les éléments d'arrêt (807) sont des ergots (807) dressés vers le haut;
    c) la grille (800) consiste en une rangée de trous (800) permettant d'effectuer un réglage à différents niveaux;
    d) les positions maximales avant et arrière du porte-rembourrage (80) sont délimitées par des butées (809,810;813); et
    e) le porte-rembourrage (80) sur la plaque de siège (8) est guidé par des contours rainurés (808,814) pratiqués d'une part sous le porte-rembourrage (80) et d'autre part, complémentaires aux bords latéraux de la plaque de siège (8).
EP99949277A 1998-10-20 1999-10-20 Mecanique de fauteuil Expired - Lifetime EP1039816B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
WOPCT/IB98/01647 1998-10-20
PCT/IB1998/001647 WO2000022959A1 (fr) 1998-10-20 1998-10-20 Systeme mecanique pour fauteuil
PCT/IB1999/001720 WO2000022961A1 (fr) 1998-10-20 1999-10-20 Mecanique de fauteuil

Publications (2)

Publication Number Publication Date
EP1039816A1 EP1039816A1 (fr) 2000-10-04
EP1039816B1 true EP1039816B1 (fr) 2003-06-25

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EP99949277A Expired - Lifetime EP1039816B1 (fr) 1998-10-20 1999-10-20 Mecanique de fauteuil

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US (1) US6439661B1 (fr)
EP (1) EP1039816B1 (fr)
JP (1) JP2003521956A (fr)
AT (1) ATE243445T1 (fr)
DE (1) DE59906092D1 (fr)
WO (2) WO2000022959A1 (fr)

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US6439661B1 (en) 2002-08-27
ATE243445T1 (de) 2003-07-15
WO2000022961A1 (fr) 2000-04-27
DE59906092D1 (de) 2003-07-31
WO2000022959A1 (fr) 2000-04-27
EP1039816A1 (fr) 2000-10-04
JP2003521956A (ja) 2003-07-22

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