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
  • A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers
• • 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
  • A47C1/03—Reclining or easy chairs having independently-adjustable supporting parts the parts being arm-rests
• • 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
  • A47C1/03—Reclining or easy chairs having independently-adjustable supporting parts the parts being arm-rests
  • A47C1/0303—Reclining or easy chairs having independently-adjustable supporting parts the parts being arm-rests adjustable rectilinearly in vertical direction
  • A47C1/0305—Reclining or easy chairs having independently-adjustable supporting parts the parts being arm-rests adjustable rectilinearly in vertical direction by peg-and-notch or pawl-and-ratchet mechanism
• • 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
  • A47C1/03272—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
  • A47C1/03283—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

Definitions

• the subject of the present invention is a chair, in particular an office swivel chair, with a height-adjustable seat surface and an incline-adjustable back part, the adjustment of the back part being accompanied by a synchronous change in position of the seat surface.
• the chair has a swivel axis running across the width of the seat surface, which is formed by articulated connections on the seat support.
• the entire chair mechanism is arranged below the seat plate.
• Height and incline adjustments are made using springs, preferably gas springs. In order to optimize the kinematics of the incline and to set a preload superimposed on the gas spring, it is practice to provide an additional helical compression spring.
• the gas springs are actuated by adjusting levers which are arranged below the seat plate and to which the user has easy access when sitting. If the locking of the tilt adjustment is released, you can move from the vertical position to the tilt position by shifting your body weight, whereby the seat plate follows the adjustment.
• Chairs of this type offer the user increased comfort, since the back part and the seat adapt ergonomically to the seated posture.
• the invention further relates to a cover for the back part and to a height-adjustable armrest.
• CH-A-582 498 also proposes a chair with a swiveling backrest and associated seat cover, the reference being the Seat extends beyond the pivot axis to the rear of the frame.
• a gas spring is used for the inclination adjustment.
• the height adjustment and an integrated adjusting mechanism are missing.
• WO-A-98/16140 discloses a chair with a pivotable back part, the axis of rotation of which defines a rear region on the seat with a seat cover.
• a section of the back part extends to the axis of rotation, where the back part is hinged to the seat support.
• a one-piece upholstery cover is attached to the seat support and runs from the seat over the axis of rotation to the frame part behind the seat cover.
• the back part is composed of the back support articulated in the hinge connection and a bow-shaped back tensioner to be fixed above it, which is inserted into the back part of the cushion cover.
• the upholstery cover spans the seat and back.
• the back support has a cross bar to which the upholstery cover is attached and from there passes to the back part.
• the seat is virtually fixed when the backrest is inclined, only the seat cover as a cushion section follows a changed incline, so that a complete synchronous sequence between the back part and the seat is not achieved. There are also no armrests on this chair.
• the invention is therefore based on the object of realizing the full synchronous sequence between the pivoting movement of the back part and the seat surface for a chair with a pivot axis extending over the seat surface.
• the basic structure of the chair mechanism should be as inexpensive, reliable, low-service and easy to use. Furthermore, the mechanism should be integrated into the chair as a compact construction.
• the back cover should provide good support for the user's lumbai area.
• the chair must be equipped with height-adjustable armrests that are easy to adjust and still have high stability in the selected setting. Ultimately, the chair should be able to be mass-produced in a rational and cost-effective manner, while allowing an original aesthetic. Overview of the invention
• the adjusting mechanism is designed for a chair seat that is placed on a base frame known per se with a gas spring used vertically for height adjustment.
• the seat support arranged at the bottom of the seat is placed on the telescopically extendable piston rod of the gas spring.
• the seat support carries a seat plate, and a pivotable back support is articulated on a main axis of rotation, which runs above, across the seat plate, parallel to its front edge.
• An inclination spring is articulated on the one hand on the seat support on a fixed axis of rotation and on the other hand on the back support on a moving axis of rotation.
• the seat plate On its underside, has guide links, in which support arms of the seat carrier engage, displaceable transversely to the main axis of rotation.
• the seat plate is articulated on the moving axis of rotation, together with the inclination spring, on the back support.
• Two mutually spaced guide links are advantageously provided near the front edge of the seat plate, the guide links having a front boundary as a stop at the front.
• Front journals arranged on the free ends of the support arms engage in the guide slots.
• Two arms of the back support which extend above the side of the seat plate, and in principle two vertical branches - these represent angled extensions of cross arms of the seat support that run below the seat plate - are articulated to one another in the main axis of rotation.
• the branches each have an insertion opening for receiving an armrest.
• the back support has a crossbar that extends between the arms, parallel to the main axis of rotation, and has two supports that run upwards from the meeting of the crossbar with the respective arm.
• An axle rod is fastened to the cross bar, through which the movable axis of rotation runs with the articulated seat plate and the articulated inclination spring.
• a gas spring with a helical spring attached is primarily considered as the inclination spring.
• a back cover is stretched between the arms, and an arch-shaped back tensioner can be attached to the arms, so that the arms are only frustum-shaped.
• a hinge plate is articulated on both sides of the articulated inclination spring on the axle rod, and the seat plate is attached to the hinge plates at a variable distance from the axis of rotation.
• There is a ball socket in the seat support for receiving a release ball, which can be moved against the valve stem of the tilt gas spring using a cable and an operating lever, which releases the lock of the tilt gas spring - as an activation.
• a height-adjustable lumbar reinforcement insert - in the form of a flexible plate - is arranged in the back cover.
• An upwardly projecting fixing tongue extends from the plate.
• the reinforcement insert is inserted into a pocket that is open at the top and is incorporated into the back cover.
• the back cover of the crossbar is fixed on its lower edge. This is advantageously done with fastening elements protruding through the cross bar, with which the axle rod is also fastened to the cross bar.
• the armrest has an approximately vertical support with an armrest arranged at the top, a notch section with a systematic notch grid being present on the support.
• the notches lie on top of each other in a row and are semicircular.
• the notch section is inserted into the insertion opening of the upright branch of the seat carrier. A hole is made in this branch, which partially touches the inserted notch area.
• a control button supported by a spring sits in the bore and engages lockingly in the contour of a notch in position with respect to the control button.
• the cross section of the support is preferably elliptical, the notches lying on a main apex of the ellipse.
• the control button is axially connected to a plate element, from which a circular segment engages in the positioned notch.
• the essential advantages of the positioning mechanism lie in the efficient and comfortable synchronization between the movements of the back support and seat plate.
• the chair is perfected by height-adjustable armrests, whereby the adjustment is easy to handle for the user and the set positions remain stable, even under higher loads.
• the lumbar reinforcement insert which can be used in variable heights in the back cover, provides support that can be quickly and individually positioned for the lumbar area of the user.
• Figure 1A an entire chair in side view
• Figure 1B the chair according to Figure 1A from below in perspective view
• Figure 2A a seat support with articulated back support and the tilt gas spring in side view as a partial section
• Figure 2B the articulated back support with the seat plate holder in perspective view
• Figure 3A the seat support from behind
• Figure 3B the seat support according to Figure 3A in side view as a partial section
• Figure 3C the seat support according to Figure 3A in plan view
• Figure 4 the movement sequence of the chair between vertical position and inclination position as a schematic diagram
• Figure 5A a single armrest
• FIG. 5B a section of the armrest support according to FIG. 5A with the notches in enlargement
• FIG. 5C the locking mechanism on the armrest in accordance with FIG. 5A in horizontal section
• Figure 6A the cut back cover with an inserted lumbar reinforcement insert in perspective view of the back of the chair
• Figure 6B the lumbar reinforcement insert of Figure 6A
• FIG. 6C the back cover with inserted lumbar reinforcement insert according to FIG. 6A in a side view as a partial section.
• the entire chair is divided into two levels, the base U known per se and the seat S placed on the base U, which contains the inventions.
• 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 vertical gas spring 13 is inserted vertically.
• a telescopically extendable piston rod 14 protrudes from the vertical gas spring 13, onto which the seat support 2, which is the base part of the entire seat S, is placed.
• the seat S is both rotatable about the axis A and adjustable in height with the extension or retraction of the piston rod 14 on the axis A.
• the seat S includes a seat plate 3 with a seat cushion 34, a back support 4, a tilt gas spring 5, on the piston rod of which a helical spring 52 is pushed, a back cover 6 and two armrests 7.
• the tilt gas spring 5 is articulated on the cross bar 40 of the back support 4 in the horizontal axis of rotation D2.
• two vertical supports 41 and two extend practically forwards - towards the front edge 30 of the seat plate 3 - horizontal arms 42 extending at right angles.
• the arms 42 are connected in a hinge shape to the seat support 2, so that here the main axis of rotation D is formed, around which the back support 4 can be pivoted as a whole.
• a bow-shaped back tensioner 43 is attached to the two vertical supports 41 and is covered by the back cover 6.
• the massive, four-armed seat support 2 has the rear base section 20 with the bore 200, into which the piston rod 14 of the vertical gas spring 13 is inserted.
• a crossbeam 21 extends from the base section 20 on both sides, horizontally and parallel to the main axis of rotation D. At the ends, the crossbeams 21 continue with an upwardly angled branch 22 into which the lower, free ends of the supports 71 of the armrests 7 are inserted and through which the main axis of rotation D extends with the articulated back support 4.
• the height of the armrests 7 can be fixed with an operating button 70 which is accessible laterally on the branch 22.
• the supports 71 extend from the branch 22 upward to the horizontally arranged armrest 72. Also from the base part 20, between the two cross arms 21, two support arms 23 extend, which strive towards the front edge 30 of the seat plate 3.
• two mutually spaced guide links 32 are arranged, which run towards the front edge 30 of the seat plate.
• the guide links 32 end with a front boundary 320.
• the operating levers 130, 50 which can be easily reached by the user while sitting with his hands, for actuating the vertical gas spring 13 and the tilt gas spring 5.
• two detachable fastening elements 33 protrude from the underside of the seat plate 3, near the rear edge 31 thereof.
• the seat plate 3 resting on two hinge plates 8 can be fixed at an adjustable distance from the cross member 40 of the back support 4.
• the journals 230 of the support arms 23 move further into the guide link 32, ie in the direction of their boundary 320.
• the seat depth can thus be adapted to the individual user needs.
• the line of alignment of both bearing journals 230 results in the horizontal sliding axis G.
• the hinge plates 8, like the tilt gas spring 5, are articulated on the cross bar 40.
• the seat plate 3 is maximally fixed in the direction of the back support 4.
• the bearing pins 230 of the seat support 2 are located furthest forward, directly in front of the end boundaries 320 of the guide link 32, while the fastening elements 33 are located in the elongated holes 80 of the hinge plates 8 at the rear stop.
• the hinge plates 8 are pivotally attached together with the tilt gas spring 5 on the horizontal axis of rotation D2.
• the axis of rotation D2 is formed by an axle rod 81 which is fixedly fixed along the cross bar 40, the inclination gas spring 5 being arranged between the two hinge plates 8 and the axis of rotation D2 being parallel to the main axis of rotation D.
• the axle rod 81 is partially embedded in the cross member 40.
• a fastening element 33 preferably consists of a threaded bolt 330 protruding from the underside of the seat plate 3 and a nut 331 which can be screwed against the hinge plate 8 from below.
• the threaded bolt 330 is firmly seated in the seat plate 3 and extends through a longitudinal slot 80 in the hinge plate 8, so that it can be fixed displaceably over the extension of the longitudinal slot 80 and thus the position of the sliding axis G is fixed.
• Bowden cables 131.51 run from the operating levers 130.50 to actuate the height and inclination gas springs 13.5.
• the valve rod for triggering the tilt gas spring 5 faces the base section 20 of the seat support 2.
• a ball socket 201 is inserted, in which a bearing ball 202 is located as a support for the tilt gas spring 5 on the axis of rotation D1.
• An extension of the valve rod of the tilt gas spring 5 extends through the bearing ball 202.
• the switching element which is connected to the associated operating lever 50 via a Bowden cable. When the operating lever 50 is actuated, the switching element moves the valve rod of the tilt gas spring 5, which thus comes into the open position. If no body pressure is exerted on the back support 4, the piston rod extends and the back support 4 straightens up to the vertical position.
• the back support 4 can be pressed into its maximum inclination position.
• the branch 22 there is an insertion opening 220 accessible from above for receiving the lower notch portion 710 (see FIGS. 5A and 5B) of the support 71 of the insertable, height-adjustable armrest 7.
• the control button 70 for the height locking of the armrest 7 is located on the outer wall of the Astes 22 and is aligned tangentially past the insertion opening 220.
• the articulated connection on the main axis of rotation D between the branch 22 and the tapering arm 42 is in each case formed by a cutout 221, 421 of half the material thickness, so that the pegs 222, 422 rounded off at the front engage in the cutout 421, 221 located opposite each other.
• a fixed axle pin 423 extends through the adjacent pins 222, 422 on the main axis of rotation D.
• the back cover 6 is pulled over the length of the axle bar 81 to the rear of the crossbar 40 and there by means of fastening elements 424 - for example screws - going through the axle pin 423 fixed. In the corner area, where the cross member 40, the vertical support 41 and the arm 42 come together, the back cover 6 has a recess 60.
• FIGS. 3A to 3C can be seen in the base section 20 the bore 200 for receiving the piston rod 14 of the vertical gas spring 13, in addition to the bore 200 the guides 203 for the Bowden cables 51, 131 and further back the ball socket 201 for receiving the release ball 202 for the tilt gas spring 5 and next to it the ball socket 201 has a recess 204 for the incoming Bowden cable 51.
• the plug-in opening 220 going in, the control button 70 and the pins 222 located on the main axis of rotation D and the associated recesses 221.
• the support arms 23 show the front according to the Side protruding bearing pin 230.
• the behavior of the back support 4 and the seat plate 3 when the back support 4 is tilted back is considered.
• the seat plate 3 is fixed in a defined position by means of the fastening elements 33.
• the sliding axis G lies within the guide link 32 in the position Po, ie relatively away from the end boundaries 320 and the seat plate 3 has its normal position.
• the distance between the axis of rotation D2 and the original position Po is shortened since the seat plate 3 can be displaced transversely to the main axis of rotation D with the guide links 32 hangs on the bearing journal 230 of the support arms 23 of the seat support 2, the seat plate 3 is pushed in the direction of the front edge 30.
• the sliding axis G shifts the distance s to the position P-j.
• the seat plate 3 lowers significantly at the rear edge 31, while a proportional, relatively slight lifting occurs at the front edge 30. There is thus a synchronous sequence of movements between the back support 4 and the seat plate 3.
• the armrest 7 has the approximately vertical support 71, to which the approximately horizontal armrest 72 is fastened at the top.
• the principally elliptical support 71 has a notch section 710 with a systematic notch grid, consisting of uniformly objected semicircular notches 711, which lie one above the other on a main apex according to the geometry theory.
• the curves of the notches 711 indicate the central axis M of the support 71.
• a bore 73 is provided which is oriented tangentially past the insertion opening 220 and which internally has a constriction 730.
• a spring-loaded control button 70 designed as a push button is inserted from one side of the hole; from the other side a plate element 74, whose reduced-diameter shaft 740 protrudes through the constriction 730 and is firmly connected to the control button 70.
• a helical spring 75 strives to push the control button 70 outward and pulls the plate element 74 into the bore 73.
• a circular segment 741 of the plate element 74 engages in the one set to the level of the control button 70 Notch 711 a.
• the armrest 7 is thus fixed in the extended height. To release it, the control button 70 must be pressed in against the action of the coil spring 75, so that the plate element 74 and the notch 711 coming out of engagement.
• the armrest 7 can now be adjusted in height until a notch 711 corresponding to the desired height is occupied by the plate element 74.
• the back cover 6 has an internal, upwardly open pocket 61 in the lumbar region, into which a plate-shaped lumbar reinforcement insert 9 is inserted.
• the reinforcement insert 9 has transverse elasticity slots 90 and an upwardly projecting fixing tongue 91.
• This fixing tongue 91 projects through a slot 62 in the back cover 6 on the rear of the chair, the slot 62 being located above the pocket 61.
• the back cover On the front, towards the user, the back cover has padding 63.
• the fixing tongue 91 is released from the back cover 6 and the reinforcement insert 9 is pushed further into the pocket 61 or pulled out.
• the lower ends of the back cover 6 are fixed on the rear side of the cross member 40.

Landscapes

• Health & Medical Sciences (AREA)
• Dentistry (AREA)
• General Health & Medical Sciences (AREA)
• Chairs Characterized By Structure (AREA)
• Chair Legs, Seat Parts, And Backrests (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=11004764

Family Applications (1)

Country Status (6)

Families Citing this family (20)

Family Cites Families (13)

• 1998
  • 1998-10-21 JP JP2000576743A patent/JP2002527175A/ja active Pending
  • 1998-10-21 AT AT98946677T patent/ATE249772T1/de not_active IP Right Cessation
  • 1998-10-21 EP EP98946677A patent/EP1039815B1/fr not_active Expired - Lifetime
  • 1998-10-21 US US09/581,889 patent/US6557939B1/en not_active Expired - Lifetime
  • 1998-10-21 DE DE59809667T patent/DE59809667D1/de not_active Expired - Lifetime
  • 1998-10-21 WO PCT/IB1998/001671 patent/WO2000022960A1/fr active IP Right Grant

Non-Patent Citations (1)

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