EP2908696A1

EP2908696A1 - Seat with relative synchronous displacement between back incline and seat incline

Info

Publication number: EP2908696A1
Application number: EP12780635.4A
Authority: EP
Inventors: Thomas Schneider
Original assignee: Vitra Patente AG
Current assignee: VITRA AG
Priority date: 2012-10-18
Filing date: 2012-10-18
Publication date: 2015-08-26
Anticipated expiration: 2032-10-18
Also published as: WO2014059553A1; NO2908696T3; EP2908696B1; US10028586B2; EP2908696B2; US20150245714A1

Abstract

Disclosed is a type of seat with relative synchronous displacement between back incline and seat incline, specifically along a region between a respective zero position of back incline (R₀) and seat incline (S₀) and a respective maximum back incline and seat incline. The seat has an underframe (1) which is intended to be placed on the floor and on which a base (2) is rigidly secured. A seat support (6) is connected to the base (2) and has a seat region and a back region. The seat also comprises two backrest frames (3) which can be extended separately towards each other and which are secured at one side on the base (2) and at another side on the back region of the seat support (6). The two backrest frames (3) are attached independently of each other on the base (2) on a stationary first axis of rotation (D1). The seat region of the seat support (6) is attached on the base (2) on a stationary second axis of rotation (D2). The two backrest frames (3) are attached independently of each other on the back region of the seat support (6) on an elastically deformable third axis of rotation (D3). The back region of the seat support (6) is elastically twistable. A cover is stretched over the seat support. In the embodiment as a rotating office seat, a height-adjustable gas spring (12) is arranged in the underframe (1), on which gas spring the base (2) rests, in order to set the seat support (6) at a height which corresponds to the needs of a user and in order to design a vertical axis (V) in rotatable manner.

Description

SYNCHRONOUS SEAT ADJUSTMENT

Field of application of the invention

The present invention relates to a chair with mutually synchronous adjustment between the back and seat tilt from a zero position with in principle upright backrest to a maximum inclination. The chair has a base for placing on the ground, on which a base is rigidly attached. Connected to the base is a seat carrier which has a seating area and a back area. Furthermore, the chair includes two backrest brackets, which can be deflected differently from one another and are fastened on the one hand to the base and, on the other hand, to the back region of the seat support. The seat carrier is covered with a cover. In the equipment as office swivel chair in height adjustable gas spring is arranged in the base on which rests the base to adjust the seat support to a user's needs corresponding height and to rotate about a vertical axis.

State of the art

The patent publications JP 10 151 033 A and US 5,713,632 disclose chair constructions having a seating surface that is divided into two sections perpendicular to the front of the chair, in order to allow a deflection of the seat surface with a lateral inclination.

EP 1 401 306 B1 discloses a chair with a seat and a backrest, each of which consists of a number of elements that are movable independently of one another and are attached to each other like a building block. The division of the elements runs parallel to the chair front, and depending on the weight shift of the user, the individual elements are deflected in different intensity with lateral inclination.

The subject of WO 2007/110 729 A2 is a chair whose backrest has two elastic side rails with a ribbed structure. With asymmetric load on the backrest, 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 attached to the base for placement on the floor. Connected to the base is a seat carrier which has a seating area and a back area. Two mutually different deflectable backrest bar are attached on the one hand to the base and on the other hand to the back of the seat support, so that a sprung lateral inclination of the seat is made possible.

Object of the invention

Based on the conditions of a mutually synchronous adjustment between back and seat tilt on a chair and also an asymmetrical lateral deflection, the invention has for its object to propose a perfected for mass production and ergonomic optimal performance characteristics of the chair construction. Considerable aspects here are the most efficient use of materials, a productive assembly in series production, ease of service with minimal maintenance and the possibility of an aesthetic design of the chair.

Overview of the invention

The chair is of the type with mutually synchronous adjustment between back tilt and seat tilt, namely over a range between a respective zero position of back tilt and seat tilt and a respective maximum back tilt and seat tilt. The chair has a base for placing on the ground, on which a base is rigidly attached. Connected to the base is a seat carrier which has a seating area and a back area. Furthermore, the chair includes two backrest brackets which are mutually differently deflectable and are fastened on the one hand to the base and on the other hand to the back region of the seat support. The two backrest brackets are articulated independently of each other on a fixed first axis of rotation at the base. The seating area of the seat carrier is on a fixed second Rotational axis hinged to the base. The two backrest brackets are articulated independently of each other on an elastically deformable third axis of rotation on the back region of the seat support. The back region of the seat support is elastically twistable.

Hereinafter, specific embodiments of the invention are defined: On the chair, a first spring unit is provided, which acts against the respective movable backrest bar. In parallel to the first spring unit, a second spring unit is present, which is supported on the one hand at 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 comprises two separate first spring elements. The second spring unit comprises two separate second spring elements. The base is a U-shaped housing having a central portion and two legs extending arm-like therefrom. In each of the legs, a second spring element is arranged. The first axis of rotation extends through the central part, while the second axis of rotation extends through the free ends of the two legs.

The seat carrier comprises two spars which extend over the seating area and the back area. At the two spars upper connecting organs are present in the back region through which the third axis of rotation runs. On the two spars, middle connecting elements are present in the seating area, through which runs a fourth axis of rotation. Between the two spars, a first transverse strut is arranged in the seating area, at which there are front connecting elements through which the second axis of rotation passes.

The first cross strut is located forward in the seating area, and between the two struts extends behind in the seating area a second cross strut. The back area is bridged by a spine strap between the two spars. The two spars, the two cross struts and the back bracket form the seat support as assembled items or the seat support is in one piece as Plastic injection molded part. Each bar has a range of elasticity between the seating area and the back area.

The chair can be equipped with armrests, of which each arm is 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 region horizontally extending from the third rotation axis in principle, and a support region extending upward from the fourth rotation axis. There is a transition between the support area and the support area. The armrests support the damping effect of the first spring unit and the second spring unit when moving the chair into the maximum back tilt and seat tilt. As the chair moves back toward the zero position of the back tilt and seat tilt, the armrests support the restoring force of the two spring units. The armrests are made in one piece as a plastic injection molded part.

Through the base extends a fixed fifth axis of rotation on which a pre-adjuster for adjusting the intensity of the first spring unit is arranged. The single first spring element is a block-shaped body made of elastomer, which is arranged at the base of each backrest bar. On the pre-adjuster two displaceable pressure pieces are arranged along the fifth axis of rotation, of which one of the pressure pieces is assigned to one of the first spring elements. The plungers can be aligned by actuation of the preselector with a selectable degree of congruence on the two first spring elements to move the chair in the maximum back tilt and seat tilt according to the squeezed between the lugs and the pressure parts of the first spring elements together with the action of the second Spring unit to achieve the desired damping.

The second spring elements of the second spring unit are helical compression springs. Each second spring element is provided with an end piece, which has a fixing member which receives one end of the spring element and thus a spring assembly is formed. A sixth axis of rotation extends through the sets of both backrest brackets, on which the end pieces of both spring assemblies are articulated.

The spars of the seat support have a longitudinal groove, in which a cover for overstretching the seat support can be fixed.

In the lower frame, a height-adjustable gas spring is arranged, on which rests the base to adjust the seat support to a user's needs corresponding height and rotatable about a vertical axis.

Brief description of the accompanying drawings

Show it:

Figure 1A - a chair according to the invention, in a perspective front view;

FIG. 1B - the chair according to FIG. 1A, without cover, in a changed perspective front view;

Figure 1C - the structure according to Figure 1B, in a perspective rear view;

Figure 1 D - the structure according to Figure 1 B, in perspective bottom view;

Figure 1 E - the structure according to Figure 1 B with the carrier in zero position of back and seat tilt, in side view;

Figure 1 F - the structure according to Figure 1 B with the carrier in maximum

Back and seat tilt, in side view;

Figure 2A - the structure according to Figure 1 B, in a partial perspective exploded view, from the top front;

Figure 2B - the structure according to Figure 2A, in partial perspective

Explosive view, from behind below;

Figure 3A - the base, the spring units and the backrest bar of FIG

2A, in perspective exploded view;

FIG. 3B - the structure according to FIG. 3A, in a changed perspective view

Exploded view;

Figure 3C - the enlarged detail X1 of Figure 3A; Figure 3D - the slide of Figure 3A, in an enlarged perspective view; Figure 3E - the cover of Figure 3A, in an enlarged perspective view;

Figure 4A - the housing of the base of Figure 3A, in an enlarged perspective rear view;

Figure 4B - the housing according to Figure 4A, in partial perspective

-Sectional view;

Figure 4C - a partially assembled package of the second spring unit of Figure 3A, in an enlarged perspective view;

Figures 4D to 5L: the phased assembly of base, spring units and backrests, in perspective views;

Figure 4D - first phase: the housing according to Figure 4A, with inserted second spring unit;

Figure 4E - the structure according to Figure 4D, in partial perspective

-Sectional view;

Figure 4F - second phase: the structure according to Figure 4E, supplemented with inserted pressure pieces;

Figure 4G - the structure according to Figure 4F, in partial perspective

-Sectional view;

Figure 4H - third phase; the structure according to Figure 4F, with the housing approximate pre-adjuster;

Figure 4J - the structure according to Figure 4H, with plugged in the housing

prefs;

Figure 4K - the structure according to Figure 4J, in partial perspective

-Sectional view;

Figure 5A - fourth phase; the structure according to Figure 4K, with positioned on the housing slide and cover and with the housing approximated backrest bars;

Figure 5B - fifth phase: the structure according to Figure 5A, with inserted between housing and back ironing first spring unit;

Figure 5C - sixth phase: the structure according to Figure 5B, with fixed to the backrest brackets first spring unit and in the lower Axial holes inserted sockets;

seventh phase: the structure according to Figure 5C, aligned with the lowered backrest brackets on the axis of rotation D1 and docked on the axis of rotation D6 on the second spring unit, in partial perspective sectional view;

the structure according to Figure 5D, with upright back ironing, in partial perspective sectional view; eighth phase; the structure according to Figure 5E, with aligned on the axis of rotation D1 and the housing approximated sleeves;

the structure according to Figure 5F, with inserted sleeves;

at the end _. Hase: the structure according to Figure 5G, with aligned on the axis of rotation D1 and the housing approximated height adjuster, trigger and cap;

the structure according to Figure 5H, with inserted on the axis of rotation D1 height adjuster and mounted trigger;

the structure according to Figure 5J, with inserted on the axis of rotation D1 fuse;

tenth phase: the structure according to Figure 5K, with attached cap;

Figures 6A to 8: Settings of the bias to first spring unit, at zero position of back and seat tilt or maximum back and seat tilt, in partial perspective sectional view, as a schematic diagrams;

Figure 6A - the structure according to Figure 5K, at zero position of back and seat tilt and minimal bias to first spring unit;

Figure 6B - the structure according to Figure 6A, in an expanded sectional view of the first spring unit;

Figure 7A - the structure according to Figure 5K, at zero position of back and seat tilt and maximum preload on the first spring unit;

Figure 7B - the structure according to Figure 7A, in an expanded sectional view the first spring unit;

FIG. 7C shows the structure according to FIG. 7A, in an expanded sectional view onto the second spring unit;

Figure 8 - the structure according to Figure 5K, with maximum back and

Seat tilt and minimum preload on first spring unit, in expanded sectional view on the first spring unit;

FIGS. 9A to 9D: unblocked or blocked zero position of back and seat inclination, as schematic representations;

the structure according to Figure 5L, slide in unblocked position;

the structure according to Figure 5L, slide in the locked position; the enlarged detail X2 of Figure 9A; and

the enlarged detail X3 of Figure 9B.

embodiment

With reference to the accompanying drawings, the detailed description of an embodiment of the inventive chair follows.

The following definition applies to the entire further description. If reference numerals are included in a figure for the purpose of graphic clarity, but are not explained in the directly associated description text, reference is made to their mention in the preceding description of the figures. For the sake of clarity, the repeated designation of components in subsequent figures is usually dispensed with, as far as the drawing clearly shows that they are "recurring" components.

FIGS. 1A to 1F

From the base 2 extend upwardly spaced two backrest bar 3, to each of which a support 6 and one armrest 7 is fixed. The base 1 has a star-shaped foot 10 from which extends centrally a vertical standpipe 11, which Recording a vertical gas spring 12 is used. The foot 10 is provided with a plurality of bottom elements 14, eg rollers. Through the rear portion of the base 2 extends a fixed first axis of rotation D1, on which the backrest bar 3 are articulated and on which a height adjuster 25 is guided axially movable. With the height adjuster 25, the gas spring 12 can be operated and thus vary the height of the seat according to the needs of a user. At the same time allows the gas spring 12 to rotate the seat about a vertical axis V, as is common for comfortable office chairs.

Through the front portion of the base 2 and parallel to the first axis of rotation D1 extends a fixed second axis of rotation D2, at which the one or more parts procured carrier 6 is hinged front. On the rear side, the carrier 6 is also connected on the movable third axis of rotation D3 with the two backrest bars 3. This third axis of rotation D3 is pivotable about the first axis of rotation D1 and extends through the back portion 62 of the carrier 6. On the fixed fifth axis of rotation D5 of the rotatable pre-adjuster 24 is arranged, with which for the deflection of the back and seat tilt from the zero position Ro.So required force varies. A fixed axis A extends parallel to the axes of rotation D1 D2 D3 and serves to receive the later-described second spring unit 5 (see Figure 3A).

Preferably, the chair is equipped with two armrests 7, which are hinged 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 portion 61 of the support 6 and is also pivotable about the first axis of rotation D1. The individual quasi-angular armrest 7 is structured into the support region 71, which projects upwards from the fourth rotation axis D4, and into the essentially horizontal support region 72, which leads to the third rotation axis D3. Between the support portion 71 and the support portion 72 is an arcuate transition 78th

The carrier 6 consists essentially of two strip-shaped, parallel spaced and in principle L-shaped bent bars 60 together men, between which a first cross member 63, a second cross member 67 and a back bracket 64 extend, which connect the spars 60 together. The entire carrier 6 can be made in one piece or the transverse struts 63, 67 and the back bar 64 are inserted between the bars 60 as separate parts. The first transverse strut 63 extends at the front and the second transverse strut 67 at the rear in the seating area 61, while the back bar 64 extends over the back area 62. The transition between the seating area 61 and the back area 62 is designed as a region of elasticity 68. Each spar 60 has on its outwardly facing side a groove 66 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 for the user arises.

The zero position of back and seat tilt (see Figure 1 E) is characterized as follows:

minimum back tilt Ro, i. the back region 62 of the carrier 6 is approximately vertical;

- minimal seat tilt So, i. the seating area 61 of the carrier 6 is approximately horizontal;

- The elasticity regions 68 of the carrier 6 are not bent up; and

- The armrests 7 are not bent.

The maximum back and seat tilt (see Figure 1 F), which behave synchronously with each other, is characterized as follows:

- Maximum back tilt R _max , ie the back portion 62 of the support 6 is obliquely backwards;

- Maximum seat tilt S _max , ie the seating area 61 of the support 6 is obliquely backwards down;

- The elasticity regions 68 of the carrier 6 are bent up a maximum; and

- The armrests 7 are maximally bent, for example on the support areas 71 and / or the transitions 78, depending on the configuration of the armrests. 7 FIGS. 2A and 2B

The first transverse strut 63 has at its free ends connecting members in order to connect them with the existing on each spar 60 recording. From the first transverse strut 63 go from two spaced apart front connecting members 630, each having a front axle hole 633, through which the second axis of rotation D2 extends. Adjacent to the elastic region 68, the second transverse strut 67 is present between the bars 60, adjacent to the seating area 61. The free ends of the second transverse strut 67 have connecting members, which serve to connect to the receptacle on the associated spar 60.

Between the second transverse strut 67 and the first transverse strut 63, there is provided on each strut 60 a central connecting element 610 which has a fifth axis hole 615. Between the elastic region 68 and adjacent to the back region 62, each spar 60 has an upper connecting member 620 with a fourth axle hole 624. Between the bars 60 extends near the lower end of the back region 62 of the back bar 64. The back bar 64 has on both sides at the outer ends each a connector 640, which are complementary to the located on the respective spar 60 upper connecting member 620 are provided. The fixation of the two transverse struts 63, 67 and the back strap 64 on the respective spar 60 takes place, for example. by means of screws.

The single armrest 7 has at the free end of the support portion 72 an upper axle pin 74 which extends on the third axis of rotation D3. At the free end of the support portion 71 sits a lower axle pin 75, which is directed to the fourth axis of rotation D4. The armrests 7 are offset slightly outwards relative to the carrier 6, the third axis of rotation D3 running through the upper axle pins 74 of the armrests 7 and the fourth axle holes 624 of the upper connecting members 620 of the uprights 60. The fourth axis of rotation D4 extends in alignment through the lower axle pins 75 of the armrests 7 and the fifth axle holes 615 of the central connecting members 610 of the spars 60. Two axle pins 224 are located on the second axis of rotation D2 and are intended for insertion into the base 2. By means of the axle pins 224, the carrier 6 at its front Connecting organs 630 pivotally connected to the base 2 at the level of the second axis of rotation D2. The undercarriage 1 is shown here removed from the base 2.

Preferably, the seat regions 61 and the back regions 62 are also elastic on the carrier 6 outside the elasticity regions 68. Also, the first and second transverse strut 63,67 and the back strap 64 may be elastic. Further, outside of the transitions 78 on the armrests 7 - instead of the transitions 78 or in addition to these - also the support portions 71 and the support portions 72 may be elastic. Particularly advantageous are the carrier 6 as a one-piece plastic injection molded part and the cover 69 as a one-piece, about the carrier 6 aufsch rümpf bares fabric procure.

FIGS. 3A to 3E

The base 2 is composed of a housing 20, the presetter 24 and the height adjuster 25. The housing 20 has a central part 21, from which two, mutually spaced, parallel legs 22 depart. Through the middle part 21, the first axis of rotation D1, the fifth axis of rotation D5 and the axis A. The second axis of rotation D2 extends near the free ends of the legs 22, wherein in alignment on the second axis of rotation D2 each an axle pin 224 is ready for insertion.

A height-adjustable slide 26 for blocking the zero position of the back and seat inclination Ro.So or for their release for the deflection in the maximum back and seat inclination R _m ax _> S _ma x is provided at the rear end of the central part 21. The slider 26 has a plate 260 on which two vertically spaced apart webs 261 extend, which engage in existing on the housing 20 complementary grooves, so that the slider 26 is guided in the downward or upward movement. Of the plate 260 extends at the top edge in each case laterally a boom 262, on which a block-shaped block 263 sits. The block 263 serves the later described blocking the back or seat tilt. Opposite the top edge of the slider 26 is at its lower edge a bar 264 available to allow ergonomic access for the user. Opposite the webs 261, the plate 260 has elevations that are intended for complementary engagement in existing on the cover 27 contours. On the basis of the cover 27 and a screw 270, the slider 26 is fixed to the housing 20, but the downward or upward movement of the slider 26 is ensured.

A cap 28 is provided for closing the third cavity 213 present on the center part 21 (see FIG. The pre-adjuster 24 lying on the fifth axis of rotation D5 consists of a spindle 240 with an external thread 241. At one end of the spindle 240, a handle 243 can be positioned, wherein a fuse 242 can be attached to the opposite end of the spindle 240. Two quasi-rectangular pressure pieces 23 are in the direction of escape to 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 located on the first axis of rotation D1 has a rod 250 on which two sleeves 251, four bushes 252, a trigger 253, a fuse 254, a spring 255 and a handle 256 can be positioned.

The backrest bar 3 are constructed mirror-symmetrically, so that only one backrest bar 3 is to be described below. The backrest bar 3 has a projection 30, in which a lower axle hole 302 is seated, which is aligned with the first axis of rotation D1. Adjacent to the projection 30 is a shoulder 31, which is provided with a contour 310. The contour 310 is step-shaped and has a first shoulder 311 and a second shoulder 312, to which the clearance 313 adjoins. Adjacent to the shoulder 31 is a cutout in the form of a bearing 32 is provided, which serves to receive the insert 320. The bearing 32 or the insert 320 seated later therein is traversed by a sixth axis of rotation D6 which lies parallel to the first axis of rotation D1. Opposite the axes of rotation D1, D6 is the third axis of rotation D3, which extends through the upper axle hole 324. The first spring unit 4 consists of two, quasi trapezoidal first spring elements 40, preferably made of elastically deformable plastic, which are 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. For the escape direction of the axis A of each package 50 of the pin 57 is assigned, which fixes the package 50 in the base 2. Each package 50 associated bolt 55 is aligned with the sixth axis of rotation D6 and penetrates in the assembled state the seated in the bearing 32 insert 320th

FIGS. 4A to 4C

The middle part 21 of the housing 20 has adjacent to each leg 22 each have a first cavity 210, which serves to receive the corresponding pressure piece 23. In the longitudinal extension of each leg 22, a second cavity 220 for storing the package 50 is present. On the upper side of the central part 21, the third cavity 213 is provided, which serves for the insertion of 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 from the underside of the middle part 21 into a receptacle which is quasi aligned with the third cavity 213.

In the housing 20, a total of five first axle holes 211 are present, which are all aligned with the fifth axis of rotation D5. In the outer side wall of the housing 20, the first axle hole 211 is provided only on the side of the presetter 24. Adjacent thereto is located in the partition wall between the first cavity 210 and the second cavity 220, a further first axle hole 211. Between the two first cavities 210 and third cavity 213 each a further first axle hole 211 is mounted in the corresponding wall. In the partition wall between the first cavity 210 and second cavity 220, the remaining first axle hole 211 is positioned. In the housing 20, there are still a total of four second axle holes 212, all of which are aligned with the first axis of rotation D1. In both outer side walls of the housing 20 each have a second axle hole 212 is provided. Adjacent thereto is located between the two first cavities 210 and third cavity 213 in the corresponding wall depending one another second axle hole 212. Except the first Achslöchem 211 and second axle holes 212 are located in the housing 20 a total of four holes 217, all of which are aligned with the axis A. Both outer side walls of the housing 20 are provided with a hole 217. Adjacent thereto sits in the partitions between the first cavity 210 and second cavity 220 depending on a further hole 217. Within the second cavity 220 is a front fixing member 221, which rises from the bottom surface opposite the front fork 222. The single leg 22 has at its free end the front fork 222 with a third axle hole 223 therein. The second rotation axis D2 extends in alignment through the two third axle holes 223.

The packets 50 belonging to the second spring unit 5 are constructed identically so that only one of them will be described below. A second spring element 51 in the form of a spiral spring is connected to an end piece 52 on the basis of a rear fixing element 53. The end piece 52 has a slot 54, which is later penetrated by the pin 57. The end piece 52 has opposite the rear fixing member 53, a rear fork 56, in which the insert 320 is located. In the assembled state of the package 50, the bolt 55 extends through the two holes 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, however, passes through the pin 57 and the slot 54 in the end piece 52 in alignment.

Figures 4P and 4E (first construction phase)

The second spring unit 5 is inserted into the base 2 and connected thereto. Initially, the insert 320 is 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. Then, the respective package 50 is pushed with the second spring member 51 first in the corresponding second cavity 220 on the leg 22 until the free end of the second spring member 51 is inserted on the front fixing member 221. The pin 57 is in the slot 54 on the axis A and rests in the holes 217. This process is done in the same way with the other package 50. The pin 57 has on one side a shoulder which is located on the second wall adjacent to each second cavity 220. The reduced diameter extension of the pin 57 is seated in the complementary hole 217 of the partition. When inserting the pin 57 raises the corresponding package 50 easily.

FIGS. 4F and 4G (second construction phase)

In each first cavity 210, the corresponding pressure piece 23 is inserted. In this case, the individual pressure piece 23 rests with a bulge along the inner thread on the upper side of the inner surface of the first cavity 210, whereby the friction is minimized in the adjusting process described later and thus the adjustment of the pressure pieces 23 is smooth. This position of the plungers 23 must be aligned accordingly and fixed until the - shown in the next build-up - pre-adjuster 24 extends through the housing 20.

Figures 4H to 4K (third construction phase)

The base 2 belonging to the pre-adjuster 24 is inserted within the housing 20 and extends through its spindle 240, the five first axle holes 211 and the two plungers 23. The two plungers 23 are in complementary engagement with the corresponding external threads 241 on the spindle 240. If the Spindle 240 penetrates all five first axle holes 211 and is in its 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. In this case, the fuse 242 sits in an existing on the shaft 240 circumferential groove. The handle 243 is mounted on the spindle 240, e.g. by means of latching or gluing or a thread, fixable.

Figure 5A (fourth construction phase)

First, the slider 26 and the associated cover 27 at the trailing edge of the housing 20, quasi in the direction of escape to the third cavity 213 attached. In this case, the cover 27 is fixed with the screw 270, but allows the slider 26 a downward or upward movement for the later described blocking or release of the synchronous adjustment of back and Sitznei- supply. The two backrest brackets 3 are approximated to the base 2, wherein the bearing 32 is aligned with the approach 30 of the backrest bracket 3 on the respective insert 320 to the package 50 out.

FIG. 5B (fifth build-up phase)

Between the housing 20 and the individual backrest bar 3, the first spring unit 4 is inserted with the first spring element 40.

FIG. 5C (sixth construction phase)

The first spring elements 40 are fixed to the shoulders 31, e.g. glued, and in each case a pair of sockets 252 is inserted into the associated lower axle hole 302 in the projection 30 of the backrest bracket 3.

FIGS. 5D and 5E (Seventh construction phase)

The single backrest bar 3 is docked in the lowered position on the corresponding package 50 of the second spring unit 5 (see Figure 5D). The bearing 32 partially surrounds the insert 30 on the insert 30 on the package 50, and the first spring element 40 is spaced apart from the first cavity 210. The two plungers 23 must be positioned on the presetter 24 so that they allow the erection of the backrest bar 3 described in the subsequent step. During erection of the backrest bar 3, the bearing 32 located at the base 30 completely surrounds the insert 320 located on the package 50, and the first spring element 40 lies completely in the first cavity 210 (see FIG. 5E).

FIGS. 5F and 5G (eighth assembly phase)

In each case, a sleeve 251 is approximated from each side of a leg 22 of the housing 20 to the second axis hole 212 and lies in alignment with the first axis of rotation D1. The sleeves 251 are inserted into the second axial holes 212. In this case, the individual sleeve 251 extends through the second axle hole 212 located in the outer wall of the leg 22, the bushes 252 inserted in the lower axle hole 302, the axle hole 212 between the first cavity 210 and the third cavity 213 does not protrude into the third cavity 213, but concludes flush with it. The single backrest bar 3 is in this situation under slight bias, ie the second spring element 51 is slightly compressed, so that the backrest bar 3 remains in an upright position.

Figures 5H to 5K (Ninth build-up phase)

The height adjuster 25 is approximated to the right leg 22, while the pre-adjuster 24 protrudes from the left leg 22. In this case, the rod 250 and the handle 256 lie in the direction of escape to the first axis of rotation D1. The trigger 253, the fuse 254, the spring 255 and the cap 28 are above the third cavity 213 ready for installation. The guided in the sleeves 251 rod 250 passes through the sleeve 251, which faces the handle 256 completely, whereas the other sleeve 251 only partially. When pushing through the first sleeve 251, the rod 250 reaches with its front end the third cavity 213 and receives the trigger 253 and the spring 255, which are in the direction of escape to the first axis of rotation D1. In the intended end position, 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 seated on the spindle 250 handle 256 is either locked, glued or screwed. About the access through the third cavity 213, the fuse 254 is snapped by a present at the trigger 253 slot on an existing rod 250 circumferential groove. The fuse 254 is within the trigger 253 and allows the height adjuster 25 only an axial process in the effective range of the spring 255 on the first axis of rotation D1. The spring 255 is compressed upon actuation of the height adjuster 25 and thus causes after actuation a restoring force to push the handle 256 in its original position.

Figure 5L (tenth building phase)

Finally, the cap 28 is snapped onto the trigger 253 and thus closes the third cavity 213. For this purpose, the cap 28 has on the underside a complementary to the trigger 253 contour. Figures 6A and 6B

The chair is currently in the zero position with minimal back and seat tilt Ro.So- The second spring unit 5 is under the montagegemässen bias, in which the pins 57 in the slots 54 strike towards the front of the chair and thus limit the zero position on the chair. At present, the minimum preload is set on the first spring unit 4. Here, both plungers 23 are positioned on the basis of the presetter 24 so that the smallest overlap with the respective first spring element 40 is formed. When moving in the maximum back and seat inclination R _m ax, S _ma x on the shoulders 31 of the projections fitting 30 first spring elements 40 are pressed against the thrust pieces 23 with a minimum spring resistance by the increasing inclination of the backrest stay 3. This setting is suitable for lightweight users.

FIGS. 7A to 7C

The chair is still in the zero position with minimal back and seat tilt Ro.So. In contrast to the previous pair of figures 6A and 6B, maximum preload is now set on the first spring unit 4. Both plungers 23 are now positioned by actuation of the presetter 24 with the largest overlap to the first spring element 40. When moving in the maximum back and seat inclination R _m S _m ax-ax the first spring elements 40 are pressed against the thrust pieces 23 with the greatest spring resistance by the increasing inclination of the backrest stay 3. This setting is suitable for higher weight users.

FIG. 8

The chair is in maximum back and seat inclination R _m ax-S _ma x. The second spring unit 5 is under increased tension, in which the pins 57 strike in the slots 54 in the direction of the chair back and thus limit the maximum back and seat inclination R _m ax.S _m ax on the chair. The compression of the second spring unit 5 is effected by the engagement of the bearings 32 in the rear forks 56 of the respective package 50 on the sixth axis of rotation D6, which is pivotable about the fixed first axis of rotation D1. Set is the minimum preload on the first spring unit 4 as in the pair of figures 6A and 6B, so both plungers 23 are positioned with the slightest overlap with the respective first spring element 40. The back region 62 of the carrier 6 has moved to the rear and thus also causes the first spring elements 40 to be largely pressed against the pressure pieces 23, but with the lowest overlap. Thus, the previously lowest spring resistance has increased somewhat and contributes to the restoring force in the zero position somewhat. To cushion against the maximum back and seat inclination R _m ax, S _max and as restoring force in the zero position also contribute to the armrests 7, which are now widened in particular as a result of the displacement of the third axis of rotation D3, eg by bending along the support areas 71 and / or at the junctions 78.

In the chair equipment without armrests 7, the spring forces of the first spring unit 4 and / or the second spring unit 5 must be adequately increased in size.

Figures 9A and 9C

The slide 26 closes in unblocked position with its bar 264 almost flush with the lower edge of the central portion 20 and is retracted. In this case, the block 263 above the second paragraph 312 of the contour 310 from the backrest bracket 3 to lie. Due to the shoulder 312 remains a clearance 313 between the contour 310 and the block 263. If the backrest bar 3 is deflected, the block 263 enters the free space 313, so that the movement towards the maximum back and seat inclination R _m ax.S _m ax is allowed on the chair.

Figures 9B and 9D

In the locked position, the slider 26 protrudes with its bar 264 beyond the lower edge of the central portion 20 and is thus extended. The block 263 is now located below the second paragraph 312 of the contour 310 of the backrest bar. 3 and is present at the contour 310. Thus, there is no more clearance 313 between the contour 310 and the block 263. Thus, the backrest bar 3 is locked in the zero position with the minimum back and seat inclination Ro.So. The effectiveness of the first spring unit 4 and the second spring unit 5 divided equally and independently on both sides of the chair and the mutually independent effectiveness of the elasticities on the support 6 and on the armrests 7 results in improved comfort by the right and the left shoulder region of the backrest ever after weight distribution by the user sitting in the chair deformed elastically different degrees.

Claims

Patent claims

1. chair with mutually synchronous adjustment between the back tilt (R) and seat tilt (S), over a range between a respective zero position of back tilt (Ro) and seat tilt (So) and a respective maximum back tilt (R _m ax) and seat tilt (S _max ), With:

a) for placing on the ground certain subframe (1);

b) a base (2) rigidly mounted on the base (1);

c) a seat support (6) connected to the base (2) and having a seating area (61) and a back area (62);

d) two backrest brackets (3) which are mutually different ausienkbar and on the one hand to the base (2) and on the other hand on the back portion (62) of the seat support (6) are fastened, characterized in that

e) the two backrest bars (3) on a fixed first axis of rotation (D1) on the base (2) are articulated independently of each other;

f) the seating area (61) of the seat support (6) is articulated on a fixed second axis of rotation (D2) on the base (2);

g) the two backrest bars (3) on an elastically deformable third axis of rotation (D3) on the back region (62) of the seat support (6) are articulated independently of each other; and

h) the back region (62) of the seat support (6) is elastically twistable.

2. Chair according to claim 1, characterized in that

a) a first spring unit (4) is provided which acts against the respective movable backrest bar (3); and

b) in parallel to the first spring unit (4), a second spring unit (5) is provided, which on the one hand on the base (2) in a fixed abutment (221) is supported and on the other hand against the respective movable backrest bracket (3) acts.

3. Chair according to one of claims 1 and 2, characterized in that

a) the first spring unit (4) is adjustable and comprises two separate first spring elements (40);

b) the second spring unit (5) comprises two separate second spring elements (51);

c) the base (2) is a U-shaped housing (20) having a central portion (21) and two legs (22) extending arm-like therefrom;

d) in each of the legs (22) a second spring element (51) is arranged; and

e) through the central part (21), the first axis of rotation (D1) extends, while through the free ends of the two legs (22), the second axis of rotation (D2) extends.

4. Chair according to claim 1, characterized in that

a) the seat support (6) comprises two spars (60) extending over the seating area (61) and the spine area (62);

b) on the two spars (60) in the back region (62) upper connecting members (620) are provided, through which the third axis of rotation (D3) extends;

c) on the two bars (60) in the seating area (62) middle connecting members (610) are provided, through which a fourth axis of rotation (D4) extends; and d) between the two spars (60) in the seating area (61) a first transverse strut

(63) is arranged, on which front connecting members (630) are, through which the second axis of rotation (D2) extends.

5. Chair according to claim 4, characterized in that

a) the first transverse strut (63) is arranged at the front in the seating area (61) and a second transverse strut (67) extends between the two struts (60) at the rear of the seating area (61);

b) the back region (62) between the two spars (60) is bridged by a spine (64);

c) the two spars (60), the two cross struts (63, 67) and the back yoke

(64) form the seat support (6) as assembled components or the Seat support (6) is made in one piece as a plastic injection molded part; and

d) each spar (60) between the seat portion (61) and the back portion (62) has a region of elasticity (68).

6. Chair according to one of claims 1 to 5, characterized in that the chair is equipped with armrests (7), of which each armrest (7) articulated on the one hand on the third axis of rotation (D3) and on the other hand on the fourth axis of rotation (D4) is.

7. Chair according to claim 6, characterized in that

a) each armrest (7) has a support region (72) extending horizontally from the third axis of rotation (D3) in principle and a support region (71) extending upwardly from the fourth axis of rotation (D4);

b) there is a transition (78) between the support area (72) and the support area (71);

c) the armrests (7) in the movement of the chair in the maximum back tilt (R _max ) and seat tilt (S _max ) support the damping effect of the first spring unit (4) and the second spring unit (5) and in the movement back towards zero position from back tilt (Ro) and seat tilt (So) support the restoring force of the two spring units (4,5); and

d) the armrests (7) are made in one piece as a plastic injection molded part.

8. Chair according to one of claims 1 to 7, characterized in that

a) extending through the base (2) has a fixed fifth axis of rotation (D5), on which a pre-adjuster (24) for adjusting the intensity of the first spring unit (4) is arranged;

b) the single first spring element (40) is a block-shaped body made of elastomer, which is arranged on the projection (30) of each backrest bar (3);

c) two displacements on the presetter (24) along the fifth axis of rotation (D5) bare pressure pieces (23) are arranged, of which in each case one of the pressure pieces (23) is associated with one of the first spring elements (40); and d) aligning the thrust pieces (23) with the selectable degree of congruence on the first two spring members (40) by actuation of the presetter (24) to move the chair to the maximum recline (R _max ) and seat recline (S _max ) in accordance with the between the lugs (30) and the pressure pieces (23) squeezed portions of the first spring elements (40) together with the action of the second spring unit (5) to achieve the desired damping.

9. Chair according to one of claims 1 to 8, characterized in that

a) the second spring elements (51) of the second spring unit (5) are helical compression springs;

b) each second spring element (51) is provided with an end piece (52) which has a fixing element (53), which receives one end of the spring element (51) and thus a spring assembly (50) is formed; and

c) a sixth axis of rotation (D6) extends through the lugs (30) of both backrest bars (3) on which the end pieces (52) of both spring assemblies (50) are articulated.

10. Chair according to one of claims 1 to 9, characterized in that the spars (60) of the seat support (6) have a longitudinal groove (66) in which a cover (69) for overstretching the seat support (6) can be fixed ,

11. Chair according to one of claims 1 to 10, characterized in that in the lower frame (1) a height-adjustable gas spring (12) is arranged, on which the base (2) rests to the seat support (6) to a the needs of Adjust user corresponding height and to make a vertical axis (V) rotatable.