EP2908696B2 - Synchrone sitzverstellung - Google Patents

Synchrone sitzverstellung Download PDF

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Publication number
EP2908696B2
EP2908696B2 EP12780635.4A EP12780635A EP2908696B2 EP 2908696 B2 EP2908696 B2 EP 2908696B2 EP 12780635 A EP12780635 A EP 12780635A EP 2908696 B2 EP2908696 B2 EP 2908696B2
Authority
EP
European Patent Office
Prior art keywords
axis
seat
rotation
spring
region
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.)
Active
Application number
EP12780635.4A
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German (de)
English (en)
French (fr)
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EP2908696B1 (de
EP2908696A1 (de
Inventor
Thomas Schneider
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
Individual
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Publication date
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Publication of EP2908696B1 publication Critical patent/EP2908696B1/de
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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
    • 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
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • A47C1/03238—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by means of 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
    • A47C1/03266—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
    • 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
    • A47C7/36—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/44—Supports for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame

Definitions

  • the present invention relates to a chair with mutually synchronous adjustment between the backrest and seat inclination from a zero position with the backrest, in principle, standing vertically up to a maximum inclination.
  • the chair has a floor-standing frame to which a base is rigidly attached.
  • a seat support is connected to the base and has a seat area and a back area.
  • the chair also has two backrest brackets that can be deflected differently from one another and are attached to the base on the one hand and to the back area of the seat support on the other.
  • the seat support is covered with a cover.
  • a height-adjustable gas spring is arranged in the subframe, on which the base rests, in order to adjust the seat support to a height corresponding to the needs of a user and to make it rotatable about a vertical axis.
  • EP 1 401 306 B1 discloses a chair having a seat and a backrest, each consisting of a number of mutually independently moveable, modularly joined elements.
  • the division of the elements runs parallel to the front of the chair, and depending on the user's weight shift, the individual elements are deflected with varying degrees of lateral inclination.
  • WO 2007/110729 A2 is a chair whose backrest has two elastic side rails with a ribbed structure. If the backrest is loaded asymmetrically, the side rails are deflected differently.
  • the chair according to EP 1 946 676 B1 allows a mutually synchronous adjustment between back tilt and seat tilt, over a range between a respective zero position of back tilt and seat tilt and a respective maximum back tilt and seat tilt.
  • a base is rigidly fastened to the underframe designed to be placed on the floor.
  • a seat support is connected to the base and has a seat area and a back area.
  • Two backrest brackets which can be deflected differently from one another, are fastened on the one hand to the base and on the other hand to the back area of the seat support, so that a cushioned lateral inclination of the seat is made possible.
  • the invention is based on the object of proposing a perfected construction for series production and for the ergonomically optimal functional properties of the chair.
  • Significant aspects are the most efficient use of materials, productive assembly in series production, ease of service with minimal maintenance and the possibility of an aesthetic design of the chair.
  • the chair is of the type with mutually synchronous adjustment between back inclination and seat inclination, namely over a range between a respective zero position of back inclination and seat inclination and a respective maximum back inclination and seat inclination.
  • the chair has a floor-standing frame to which a base is rigidly attached.
  • a seat support is connected to the base and has a seat area and a back area.
  • the chair also has two backrest brackets that can be deflected differently from one another and are attached to the base on the one hand and to the back area of the seat support on the other.
  • the two backrest brackets are articulated independently of one another on a fixed first axis of rotation on the base.
  • the seat area of the seat support is articulated on a fixed second axis of rotation on the base.
  • the two backrest brackets are articulated independently of one another on an elastically deformable third axis of rotation on the back area of the seat support.
  • the back area of the seat carrier can be twisted elastically.
  • a first spring unit is provided on the chair, which acts against the respective movable backrest bracket.
  • a second spring unit is connected in parallel to the first spring unit, which is supported on the one hand on the base in a fixed abutment and on the other hand acts against the respective movable backrest bracket.
  • the first spring unit is adjustable and includes two separate first spring elements.
  • the second spring unit includes two separate second spring elements.
  • the base is a U-shaped housing having a central portion and two arms extending therefrom.
  • a second spring element is arranged in each of the legs. The first axis of rotation runs through the central part, while the second axis of rotation extends through the free ends of the two legs.
  • the seat support includes two bars that extend across the seat area and the back area. On the two spars are upper connecting organs in the back area present, through which the third axis of rotation runs. In the seat area, there are central connecting elements on the two bars, through which a fourth axis of rotation runs. A first transverse strut is arranged between the two bars in the seating area, on which there are front connecting elements through which the second axis of rotation runs.
  • the first cross brace is arranged at the front of the seat area, and a second cross brace extends between the two bars at the back of the seat area.
  • the back area is bridged between the two bars by a back bar.
  • the two struts, the two cross braces and the back bar form the seat support as assembled individual parts, or the seat support is produced in one piece as a plastic injection molded part.
  • Each rail has an area of elasticity between the seat area and the back area.
  • the chair can be equipped with armrests, each armrest being articulated on the one hand on the third axis of rotation and on the other hand on the fourth axis of rotation.
  • Each armrest has a support area extending essentially horizontally from the third axis of rotation and a support area extending upwards from the fourth axis of rotation. There is a transition between the contact area and the support area.
  • the armrests support the damping effect of the first spring unit and the second spring unit when the chair is moved to the maximum back inclination and seat inclination. When the chair moves back towards the zero position of the back and seat inclination, the armrests support the restoring force of the two spring units.
  • the armrests are made in one piece as a plastic injection molding.
  • a fixed fifth axis of rotation extends through the base, on which a presetter for adjusting the intensity of the first spring unit is arranged.
  • the individual first spring element is a block-shaped body made of elastomer, which is arranged at the base of each backrest bracket.
  • Two displaceable pressure pieces are arranged on the presetter along the fifth axis of rotation, of which one of the pressure pieces is assigned to one of the first spring elements.
  • the pressure pieces can be aligned with the first two spring elements by operating the presetter with a selectable degree of congruence in order to move the chair to the maximum back and seat inclination according to the portions of the first spring elements squeezed between the attachments and the pressure pieces together with the effect of the second Spring unit to achieve the desired damping.
  • the second spring elements of the second spring unit are helical compression springs. Every second spring element is provided with an end piece which has a fixing member which receives one end of the spring element and thus creates a spring assembly. A sixth axis of rotation extends through the approaches of both backrest brackets, on which the end pieces of both spring assemblies are articulated.
  • the bars of the seat support have a longitudinal groove in which a cover to cover the seat support can be fixed.
  • a height-adjustable gas spring is arranged in the underframe, on which the base rests, in order to adjust the seat support to a height corresponding to the needs of a user and to make it rotatable about a vertical axis.
  • the chair consists of the base 1 placed on the floor with the fork-shaped base 2 resting on it.
  • Two backrest brackets 3 spaced apart from one another extend upwards from the base 2 , on each of which a support 6 and an armrest 7 is fastened.
  • the subframe 1 has a star-shaped base 10, from which a vertical standpipe 11 extends centrally, which serves to accommodate a vertical gas spring 12 .
  • the foot 10 is provided with several floor elements 14, eg rollers.
  • a fixed first axis of rotation D1 runs through the rear region of the base 2 , on which the backrest brackets 3 are articulated and on which a height adjuster 25 is guided in an axially movable manner.
  • the gas spring 12 can be actuated with the height adjuster 25 and thus the height of the seat can be varied according to the needs of a user. At the same time , the gas spring 12 allows the seat to be rotated about a vertical axis V , as is customary for comfortable office chairs.
  • a fixed second axis of rotation D2 runs through the front region of the base 2 and parallel to the first axis of rotation D1 , on which the carrier 6 , which is made in one or more parts, is articulated at the front.
  • the back of the carrier 6 is also on the moveable third axis of rotation D3 connected to the two backrest brackets 3 .
  • This third axis of rotation D3 can be pivoted about the first axis of rotation D1 and extends through the back area 62 of the carrier 6.
  • the rotatable presetter 24 is arranged on the fixed fifth axis of rotation D5 , with which the deflection of the back and seat inclination from the zero position R 0 ,S 0 required force can vary.
  • a fixed axis A runs parallel at a distance from the axes of rotation D1, D2, D3 and serves to accommodate the second spring unit 5 (see Fig. Figure 3A ).
  • the chair is preferably equipped with two armrests 7 , which are articulated on the one hand in the third axis of rotation D3 and on the other hand in a movable fourth axis of rotation D4 , which extends through the seat area 61 of the carrier 6 and can also be pivoted about the first axis of rotation D1 .
  • the individual, quasi-angular armrest 7 is structured into the support area 71, which protrudes upwards from the fourth axis of rotation D4 , and the supporting area 72, which is basically horizontal, and which leads to the third axis of rotation D3 .
  • the carrier 6 consists essentially of two strip-shaped, parallel, spaced apart and in principle L-shaped bent bars 60 , between which a first cross brace 63, a second cross brace 67 and a back bracket 64 extend, which connect the bars 60 to one another.
  • the entire carrier 6 can be made in one piece or the cross braces 63, 67 and the back bracket 64 are inserted between the bars 60 as separate parts.
  • the first cross brace 63 runs at the front and the second cross brace 67 at the rear of the seat area 61 , while the back bracket 64 extends over the back area 62 .
  • the transition between the seat area 61 and the back area 62 is designed as an area of elasticity 68 .
  • Each bar 60 has a groove 66 on its side pointing outwards, in which a cover 69 is fixed, which spans the entire carrier 6 on the front, so that a quasi-horizontal seat and a quasi-vertical backrest is created for the user.
  • the first transverse strut 63 has connecting elements at its free ends in order to connect them to the receptacle present on the respective strut 60 .
  • two front connecting elements 630 spaced apart from each other, each have a front axle hole 633 , through which the second axis of rotation D2 runs.
  • the free ends of the second transverse strut 67 have connecting elements which are used to connect to the receptacle on the associated strut 60 .
  • each spar 60 has a fifth axle hole 615 .
  • each rail 60 has an upper connecting element 620 with a fourth axle hole 624.
  • the back bracket 64 extends between the rails 60 near the lower end of the back area 62.
  • the back bracket 64 has on both sides at the outer ends a connector 640, which are designed to be complementary to the upper connection element 620 located on the respective spar 60 .
  • the two cross braces 63, 67 and the back bracket 64 are fixed to the respective rail 60 , for example by means of screws.
  • the individual armrest 7 has an upper pivot pin 74 which extends on the third axis of rotation D3 .
  • a lower axle pin 75 which is directed towards the fourth axis of rotation D4 .
  • the armrests 7 are offset slightly outwards relative to the carrier 6 , with the third axis of rotation D3 running in alignment through the upper axle pins 74 of the armrests 7 and the fourth axle holes 624 of the upper connection elements 620 of the bars 60 .
  • the fourth axis of rotation D4 extends in alignment through the lower pivot pins 75 of the armrests 7 and the fifth pivot holes 615 of the central connecting members 610 of the spars 60.
  • Two pivot pins 224 lie on the second pivot axis D2 and are intended for insertion into the base 2 .
  • the carrier 6 is pivotally connected at its front connecting elements 630 to the base 2 at the level of the second axis of rotation D2 .
  • the stand 1 is shown removed from the base 2 here.
  • the seat areas 61 and the are on the carrier 6 outside the areas of elasticity 68 Back areas 62 elastic.
  • the first and second cross braces 63, 67 and the back bracket 64 can also be elastic.
  • the support areas 71 and the contact areas 72 can also be elastic.
  • the carrier 6 is particularly advantageous as a one-piece plastic injection molded part and the cover 69 as a one-piece fabric that can be shrunk onto the carrier 6 .
  • the base 2 consists of a housing 20, the presetter 24 and the height adjuster 25 together.
  • the housing 20 has a central part 21, from which two mutually spaced, parallel legs 22 depart.
  • the first axis of rotation D1 , the fifth axis of rotation D5 and the axis A extend through the central part 21.
  • the second axis of rotation D2 runs close to the free ends of the legs 22, with a pivot pin 224 each being aligned on the second axis of rotation D2 and ready for insertion.
  • a height-adjustable slide 26 for blocking the zero position of the back and seat inclination R 0 , S 0 or for releasing it for the deflection into the maximum back and seat inclination R max , S max is provided at the rear end of the central part 21 .
  • the slide 26 has a plate 260 on which two webs 261 run which are spaced apart vertically parallel to one another and which engage in complementary grooves present on the housing 20 , so that the slide 26 is guided in the upward and downward movement.
  • Extending laterally from the plate 260 at the upper edge is a cantilever 262 on which a cuboid block 263 is seated.
  • the block 263 serves to block the back or seat inclination, which will be described later.
  • slider 26 Opposite the top edge of slider 26 is a ledge 264 on its bottom edge to provide ergonomic access for the user. Opposite the webs 261, the plate 260 has elevations which are intended for complementary engagement in existing contours on the cover 27 .
  • the slider 26 is fixed to the housing 20 by means of the cover 27 and a screw 270 , but the upward and downward movement of the slider 26 is ensured.
  • a cap 28 is provided to close the third cavity 213 (see Fig . Figure 4A ) intended.
  • the pre-adjuster 24 lying on the fifth axis of rotation D5 consists of a spindle 240 with an external thread 241.
  • a handle 243 can be positioned at one end of the spindle 240 , with a safety device 242 being able to be plugged onto the opposite end of the spindle 240 .
  • Two quasi-rectangular pressure pieces 23 lie in the direction of alignment with the fifth axis of rotation D5 and are intended for complementary engagement with the external thread 241 of the spindle 240 .
  • the height adjuster 25 lying on the first axis of rotation D1 has a rod 250 on which two sleeves 251, four bushings 252, a trigger 253, a fuse 254, a spring 255 and a handle 256 can be positioned.
  • the backrest brackets 3 are mirror-symmetrical, so that only one backrest bracket 3 is to be described below.
  • the backrest bracket 3 has a projection 30 in which sits a lower axle hole 302 which is aligned with the first axis of rotation D1 .
  • Adjacent to the shoulder 30 is a shoulder 31 which is contoured 310 .
  • the contour 310 is stepped and has a first paragraph 311 and a second paragraph 312 to which the free space 313 is connected.
  • Adjacent the shoulder 31 is a cutout in the form of a bearing 32 for receiving the insert 320 .
  • the bearing 32 or the insert 320 later seated therein is traversed by a sixth axis of rotation D6 , which is parallel and spaced apart from the first axis of rotation D1 .
  • the first spring unit 4 consists of two quasi-trapezoidal first spring elements 40, preferably made of elastically deformable plastic, which can be fixed to the respective shoulder 31 of the corresponding backrest bracket 3 .
  • the second spring unit 5 is composed of two identical packages 50 through which the axis A and the sixth axis of rotation D6 extend. In the direction of alignment of the axis A , each package 50 is assigned the pin 57 which fixes the package 50 in the base 2 .
  • a bolt 55 associated with each package 50 is aligned with the sixth axis of rotation D6 and, in the assembled state, protrudes through the insert 320 seated in the bearing 32 .
  • the central part 21 of the housing 20 has a first cavity 210 adjacent to each leg 22 , which is used to accommodate the corresponding pressure piece 23 .
  • a second cavity 220 for storing the package 50 is present in the longitudinal extension of each leg 22 .
  • the third cavity 213 is provided on the upper side of the central part 21 and is used for inserting the trigger 253 , the fuse 254 and the spring 255 of the height adjuster 25 .
  • the vertical gas spring 12 can be partially inserted and fixed in a receptacle from the underside of the central part 21 , which is more or less aligned with the third cavity 213 .
  • a total of five first axis holes 211 are present in the housing 20 , all of which are aligned with the fifth axis of rotation D5 .
  • the first axle hole 211 is provided in the outer side wall of the housing 20 only on the side of the presetter 24 .
  • a further first axle hole 211 is located adjacent to this in the partition between the first cavity 210 and the second cavity 220. Between the two first cavities 210 and the third cavity 213, another first axle hole 211 is attached in the corresponding wall.
  • the remaining first axle hole 211 is positioned in the partition wall between the first cavity 210 and the second cavity 220 .
  • There are also a total of four second axis holes 212 in the housing 20 all of which are aligned with the first axis of rotation D1 .
  • a second axle hole 212 is provided in each of the two outer side walls of the housing 20 . Adjacent to this, between the two first cavities 210 and the third cavity 213 , there is another second axle hole 212 in the corresponding wall. In addition to the first axle holes 211 and second axle holes 212 , there are a total of four holes 217 in the housing 20 , all of which have the axis A cursed. Both outer side walls of the housing 20 are provided with a hole 217 . Adjacent to this sits in the partitions between the first cavity 210 and the second cavity 220 a further hole 217 each.
  • the single leg 22 has at its free end the front fork 222 with a third axle hole 223 therein.
  • the second axis of rotation D2 extends in alignment through the two third axis holes 223.
  • the packages 50 belonging to the second spring unit 5 have an identical structure, so that only one of them is described below.
  • a second spring element 51 in the form of a spiral spring is connected to an end piece 52 by means of a rear fixing element 53 .
  • the end piece 52 has a slot 54 through which the pin 57 later protrudes.
  • the end piece 52 has a rear fork 56 opposite the rear fixing member 53 , in which the insert 320 is located.
  • the bolt 55 protrudes through the two bores in the rear fork 56 and the insert 320 and is secured with the fuse 550 in the axial direction along its sixth axis of rotation D6 .
  • the axis A runs through the pin 57 and the slot 54 in the end piece 52 in alignment.
  • the second spring unit 5 is inserted into the base 2 and connected thereto.
  • the insert 320 is first placed in the rear fork 56 on the corresponding package 50 and secured in the axial direction along the sixth axis of rotation D6 by means of the bolt 55 and the securing device 550 .
  • the respective package 50 is then pushed with the second spring element 51 first into the corresponding second cavity 220 on the leg 22 until the free end of the second spring element 51 is placed on the front fixing element 221 .
  • the pin 57 is inserted in the slot 54 on the axis A and rests in the holes 217. This process takes place in the same way with the other package 50.
  • the pin 57 has a shoulder on one side, which is on the partition wall adjacent to the second cavity 220 in each case lies. The diameter-reduced extension of the pin 57 sits in the complementary hole 217 of the partition. When inserting the pin 57, the corresponding package 50 is lifted slightly.
  • the corresponding pressure piece 23 is inserted into each first cavity 210 .
  • the individual pressure piece 23 rests with a bulge along the internal thread on the upper side of the inner surface of the first cavity 210 , as a result of which the friction during the adjustment process described later is minimized and the adjustment of the pressure pieces 23 becomes smooth.
  • This position of the pressure pieces 23 must be aligned accordingly and fixed until the presetter 24 —shown in the next construction phase—projects through the housing 20 .
  • the presetter 24 belonging to the base 2 is inserted inside the housing 20 and its spindle 240 protrudes through the five first axle holes 211 and the two pressure pieces 23.
  • the two pressure pieces 23 are in complementary engagement with the corresponding external threads 241 on the spindle 240. If the Spindle 240 protrudes through all five first axle holes 211 and is in the intended end position, this is provided with the fuse 242 , which is positioned in the second cavity 220 adjacent to the first axle hole 211 .
  • the fuse 242 is seated in a circumferential groove present on the shaft 240 .
  • the handle 243 can be fixed on the spindle 240, for example by means of locking or gluing or a thread.
  • the slider 26 and the associated cover 27 are attached to the rear edge of the housing 20, quasi in the direction of alignment with the third cavity 213 .
  • the cover 27 is fixed with the screw 270 , but allows the slide 26 to move downwards or upwards for the later-described blocking or release of the synchronous adjustment of the back and seat inclination.
  • the two backrest brackets 3 are brought closer to the base 2 , with the bearing 32 on the attachment 30 of the backrest bracket 3 being aligned with the respective insert 320 toward the package 50 .
  • the first spring unit 4 with the first spring element 40 is introduced between the housing 20 and the individual backrest bracket 3 .
  • the first spring elements 40 are fixed to the shoulders 31 , for example glued, and a pair of bushings 252 is inserted into the associated lower axle hole 302 in the shoulder 30 of the backrest bracket 3 .
  • the individual backrest bracket 3 is docked in the lowered position on the corresponding package 50 of the second spring unit 5 (see Fig. Figure 5D ).
  • the bearing 32 on the extension 30 partially encompasses the insert 320 on the package 50, and the first spring element 40 is spaced apart from the first cavity 210 opposite.
  • the two pressure pieces 23 must be positioned via the presetter 24 in such a way that they enable the backrest bracket 3 to be raised as described in the following step.
  • the bearing 32 located on the extension 30 completely encompasses the insert 320 located on the package 50 , and the first spring element 40 lies entirely in the first cavity 210 (see Fig. Figure 5E ).
  • a sleeve 251 is approached from each side of a leg 22 of the housing 20 to the second axle hole 212 and is aligned with the first axis of rotation D1.
  • the sleeves 251 are inserted into the second axle holes 212 .
  • the individual sleeve 251 protrudes through the second axle hole 212 located in the outer wall of the leg 22 , the bushings 252 inserted in the lower axle hole 302 , the axle hole 212 between the first cavity 210 and the third cavity 213, but does not protrude into the third cavity 213 . but closes flush with it.
  • the individual backrest bracket 3 is slightly prestressed, ie the second spring element 51 is slightly compressed, so that the backrest bracket 3 remains in the upright position.
  • the height adjuster 25 approaches the right leg 22 while the preset adjuster 24 protrudes from the left leg 22 .
  • the rod 250 and the handle 256 are aligned with the first axis of rotation D1.
  • the trigger 253, fuse 254, spring 255 and cap 28 are located above the third cavity 213 ready for installation.
  • the rod 250 guided in the sleeves 251 protrudes completely through the sleeve 251, which faces the handle 256 , but only partially through the other sleeve 251 .
  • the front end of the rod 250 reaches the third cavity 213 and receives the trigger 253 and the spring 255 , which are in the direction of alignment with the first axis of rotation D1 .
  • the front end of the rod 250 is guided in the second sleeve 251 , which is located on the side of the housing 20 on which the handle 243 is positioned.
  • the handle 256 seated on the spindle 250 is either latched, glued or screwed.
  • the fuse 254 is snapped onto a circumferential groove present on the rod 250 through a slot present on the trigger 253 .
  • the safety device 254 is located inside the trigger 253 and only allows the height adjuster 25 to move axially in the effective range of the spring 255 on the first axis of rotation D1 .
  • the spring 255 is compressed when the height adjuster 25 is actuated and thus causes a restoring force after actuation in order to push the handle 256 into its original position.
  • the cap 28 is snapped onto the trigger 253 and thus closes the third cavity 213 .
  • the chair is currently in the zero position with minimal back and seat inclination R 0 , S 0 .
  • the second spring unit 5 is under the assembly according to the preload, in which the pins 57 strike in the elongated holes 54 in the direction of the chair front and thus limit the zero position on the chair.
  • the minimum preload on the first spring unit 4 is currently set. In this case, both pressure pieces 23 are positioned using the presetter 24 in such a way that the least amount of overlap with the respective first spring element 40 occurs.
  • R max , S max When moving to the maximum back and seat inclination R max , S max , the first spring elements 40 seated on the shoulders 31 of the projections 30 are pressed against the pressure pieces 23 with the lowest spring resistance due to the increasing inclination of the backrest bracket 3 .
  • This setting is suitable for lightweight users.
  • the chair is in the maximum back and seat inclination R max , S max .
  • the second spring unit 5 is under increased tension, at which the pins 57 strike in the elongated holes 54 in the direction of the back of the chair and thus limit the maximum back and seat inclination R max , S max on the chair.
  • the squeezing of the second spring unit 5 occurs through the engagement of the bearings 32 in the rear forks 56 of the respective packet 50 on the sixth axis of rotation D6, which is pivotable about the fixed first axis of rotation D1 .
  • the minimum pretension is set on the first spring unit 4 as in the pair of figures 6A and 6B, ie both pressure pieces 23 are positioned with the smallest overlap with the respective first spring element 40 .
  • the back area 62 of the carrier 6 is moved backwards and thus also causes the first spring elements 40 to be largely pressed against the pressure pieces 23 , albeit with minimal overlap.
  • the previously lowest spring resistance has increased somewhat and contributes somewhat to the restoring force in the zero position.
  • the armrests 7 also contribute to cushioning against the maximum back and seat inclination R max , S max and as a restoring force in the zero position, which are now widened, in particular as a result of the displacement of the third axis of rotation D3 , e.g. by bending up along the support areas 71 and/or at the transitions 78.
  • the spring forces of the first spring unit 4 and/or the second spring unit 5 must be dimensioned to be adequately higher.
  • the slide 26 In the unblocked position, the slide 26 is almost flush with the lower edge of the central part 20 with its strip 264 and is retracted.
  • the block 263 comes to rest above the second step 312 of the contour 310 of the backrest bracket 3 . Because of the shoulder 312, a free space 313 remains between the contour 310 and the block 263. If the backrest bracket 3 is deflected, the block 263 moves into the free space 313 , so that the movement towards the maximum back and seat inclination R max , S max allowed on the chair.
  • the slide 26 protrudes with its strip 264 over the lower edge of the central part 20 and is thus extended.
  • the block 263 now sits below the second paragraph 312 of the contour 310 of the backrest bracket 3 and rests against the contour 310 . There is thus no longer any free space 313 between the contour 310 and the block 263 .
  • the backrest bar 3 is thus locked in the zero position with the minimum back and seat inclination R 0 , S 0 .
  • the equivalent and independently divided effectiveness of the first spring unit 4 and the second spring unit 5 on both sides of the chair, as well as the mutually independent effectiveness of the elasticities on the carrier 6 and on the armrests 7, results in improved comfort in that the right and left shoulder areas of the backrest each according to weight distribution by the user sitting in the chair, is elastically deformed to different extents.

Landscapes

  • 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)
EP12780635.4A 2012-10-18 2012-10-18 Synchrone sitzverstellung Active EP2908696B2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2012/000238 WO2014059553A1 (de) 2012-10-18 2012-10-18 Stuhl mit zueinander synchroner verstellung zwischen rücken- und sitzneigung

Publications (3)

Publication Number Publication Date
EP2908696A1 EP2908696A1 (de) 2015-08-26
EP2908696B1 EP2908696B1 (de) 2017-12-06
EP2908696B2 true EP2908696B2 (de) 2023-03-15

Family

ID=47115074

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Application Number Title Priority Date Filing Date
EP12780635.4A Active EP2908696B2 (de) 2012-10-18 2012-10-18 Synchrone sitzverstellung

Country Status (4)

Country Link
US (1) US10028586B2 (en, 2012)
EP (1) EP2908696B2 (en, 2012)
NO (1) NO2908696T3 (en, 2012)
WO (1) WO2014059553A1 (en, 2012)

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DE202012002288U1 (de) * 2012-03-08 2012-05-11 Walter Knoll Ag & Co. Kg Funktionsstuhl
GB2530297B (en) * 2014-09-18 2019-06-05 Perch Dynamic Solutions Ltd A chair back
WO2016044957A1 (de) * 2014-09-26 2016-03-31 Vitra Patente Ag Stuhl mit zueinander synchroner auslenkung zwischen rückenlehne und sitz
EP3468417A4 (en) * 2016-06-11 2019-10-30 Humanscale Corporation ARTICULATED BACKING SEAT
DE102016217503A1 (de) * 2016-09-14 2018-03-15 Sedus Stoll Ag Stuhl, insbesondere Konferenz- oder Bürostuhl, Verfahren zur Herstellung eines Stuhls
DE102016217502B4 (de) * 2016-09-14 2025-07-17 Sedus Stoll Ag Verbindungsanordnung für einen oder in einem Stuhl, Verfahren zur Herstellung einer Verbindungsanordnung, Stuhl
US10383448B1 (en) 2018-03-28 2019-08-20 Haworth, Inc. Forward tilt assembly for chair seat
WO2020247435A1 (en) * 2019-06-05 2020-12-10 Davis Furniture Industries, Inc. Improved tilting chair
WO2020252191A1 (en) * 2019-06-11 2020-12-17 Herman Miller, Inc. Chair
US11357329B2 (en) 2019-12-13 2022-06-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11197548B2 (en) * 2019-12-16 2021-12-14 Allseating Corporation Reclining control system for a chair
AU2020475171B2 (en) * 2020-10-27 2025-01-30 Okamura Corporation Chair
WO2022173799A1 (en) 2021-02-10 2022-08-18 Steelcase Inc. Body support structure
IT202100006467A1 (it) * 2021-03-18 2022-09-18 Pro Cord Spa Sedia con sedile e schienale oscillanti
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Also Published As

Publication number Publication date
WO2014059553A1 (de) 2014-04-24
EP2908696B1 (de) 2017-12-06
NO2908696T3 (en, 2012) 2018-05-05
EP2908696A1 (de) 2015-08-26
US10028586B2 (en) 2018-07-24
US20150245714A1 (en) 2015-09-03

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