EP1256294B1 - Chair, particularly office chair - Google Patents

Abstract

The rear seat rod (8), rotatably joined to the seating surface (6) via pivot (5) and via a lower pivot point (D6) to the seat support (2), lies at an angle and the top pivot point (D5) is closer to the backrest (4) than the bottom pivot point (D6). The angled front rod (7) joined to the front half (6a) of the seating surface is joined to the surface (6) through pivot point (D3) and also joined to the seat support (2) through a bottom pivot (D2), itself arranged further from the backrest (4) than pivot point (D3). Rod (8) is more steeply angled than rod (7). One of the pivot points (D5,D6) of the coupling rod (14) is provided in the surface (4) half (6b) where this faces the backrest (4).

Description

The invention relates to a chair, especially office chair, with an over a backrest support on a seat support tiltably held backrest and with a synchronous movable seat, which extends over a in the field of supported rear half of the seat rear seat armrest on the seat support, being for synchronization between the movement of the backrest and the movement of the seat a coupling link is provided, on the one hand with the seat and on the other hand rotatably connected to the backrest handlebar.

Seating and in particular chairs, in which the seat and their Moving backrest synchronously are different with synchronous mechanisms in Use. The synchronous mechanism serves to adjust the backrest to simultaneously change the position of the seat.

Thus, from DE 37 35 256 C2 a chair or armchair with synchronously adjustable Inclination of backrest and seat known. In this chair with two parts executed Seat lowers when tilting the backrest also the rear Edge of the seat off. The split seat is in the front area hinged on each side with a pair of levers on a non-swiveling seat support. At the back is the seat on each side with one on one rear carrier rigidly arranged holding part rotatably connected to the rear Carrier is rigidly connected to the backrest. On this backrest support the seat is supported by its rear area. The two-piece version the seat, with a total of two pairs of levers and two swivel joints with is connected to several carriers of the chair or armchair, however, is very expensive.

From DE 42 19 599 A1 a synchronous adjusting device is known in which a one-piece seat part as a seat with a lower support portion of a back carrier the backrest via a coupling lever called a drag lever is connected such that this due to a tilt of the backrest, the seat Pulls back while lifting at the same time. Although this is the case Body angle of a user is opened in the desired manner. However, slips the user in this movement due to the seat lift in the rear Seating area also forward. This is undesirable, as in a new upright position the backrest the body contact of the user to the backrest lost as a result of slipping, at least in the pelvic area.

The invention is therefore based on the object, a chair, in particular a Office chair, with a particularly suitable and easily realizable synchronous mechanism specify, in which the disadvantages mentioned are avoided.

This object is achieved by the features of the claim 1. This is on the one hand with the seat over an upper pivot point and on the other with the seat support rotatably connected via a lower pivot point rear seat link arranged inclined. The distance of the upper pivot point the rear seat armrest to the backrest is smaller than the distance the lower pivot point to the backrest.

The invention is based on the consideration that in a chair or Seating furniture with adjustable seat and adjustable backrest adjustment possibilities seat on the one hand and backrest on the other hand first can be considered independently. The construction thus shows initially two degrees of freedom. The adjustment of the backrest has only a single degree of freedom, if the articulation of the backrest on the seat support in a simple manner over the rigid with the backrest connected backrest support is realized on the seat support via a single Rotary axis is rotatably mounted. In addition, the seat can be more complex Have adjustment, analogous to the adjustability of the backrest Nevertheless, it can be assumed that the setting options the seat can be described with a single degree of freedom. The movement The seat can hereby both a translation and a tilting movement or a combination of different forms of exercise.

A coupling of the movements of the seat on the one hand and the backrest On the other hand, it should first make sure that every possible position the backrest is assigned a position of the seat, thereby reducing the total Construction is limited to one degree of freedom. These requirements and a permanently stable as well as structurally simple executed Kopelmechanismus are met by a coupling link, both with the Seat and rotatably connected to the backrest of the backrest is. In addition, in this coupled movement of the backrest and Seating whose at least slight reduction at least in the rear, the To reach backrest facing seat area is the rear seat handlebar - Starting from the upper, lying on the seat fulcrum - tilted outwards from the horizontal position.

In an advantageous embodiment, the seat is two seat arms or two each pair of parallel handlebars hinged to the seat support. Here are the seat handlebars rotatably connected to both the seat support and the seat. An im front portion of the seat, that is in the backrest facing away front half of the seat arranged seat arm is advantageously also for length compensation with a tilt of the backrest with synchronous back and down moving seat. An alternative to this Execution is a slotted guide in this front area of the seat, in which there provided on the underside of the seat axis in a provided on the seat support and suitably horizontally extending Long hole is guided.

In the version with both sides rotatably mounted seat link in the front Seating area for length compensation, this seat link is arranged inclined. there is the distance of an upper pivot point to the backrest, over which the front Seat link is connected to the seat, smaller than the distance of a lower Fulcrum to the backrest, over which the first front seat link with the Seat carrier is rotatably connected.

By the inclined arrangement of the effective as a length compensation element front Seat handle will lift the front edge of the seat when leaning back the backrest avoided in the backrest of the backrest the upper pivot point of the front seat link connected to the seat link is lowered. This reduction is more pronounced, the more the inclination the two seat handlebar deviates from the vertical.

In addition to the particularly suitable synchronization of the movements of the seat and the backrest is characterized by the inclined angulation of the rear Seating area, d. H. provided in the backrest facing half of the seat rear seat handlebar after vome down advantageously mechanical Load optimized as a result of a particularly favorable balance of forces. Appropriately, while the inclination angle of the rear seat arm is Verticals greater than the angle of inclination of the front seat arm to the vertical.

Due to this comparatively large inclination of the rear seat arm opposite The inclination of the front seat handlebar is in ergonomic terms the comfort This increases the seating surface when leaning back the backrest lowers mainly in the rear area. This is expediently the rear second seat link connected to the seat by at least 25% longer than the front first seat link connected to the seat. Thereby receives the seat in the desired manner in the rear area one greater range of motion than in the front area.

In a particularly advantageous embodiment of the fulcrum of the synchronization provided coupler on the seat with the fulcrum of the Seat together with the seat support rear seat handlebar together. Around In addition, both a particularly favorable kinematic function of the coupling mechanism and at the same time a simple controllability of the mechanical To achieve load conditions of the moving components, is expediently on the one hand, the rear seat handlebar in ungeeigter position of the backrest relative to the vertical by an angle β = (45 ± 30) ° obliquely the seat and hinged to the seat support. On the other hand, it is advantageous the coupling link in an inappropriate rest position of the backrest against the Vertical inclined at an angle 0 ° <α <90 ° arranged inclined is. Preferably, α = (45 ± 10) ° and β = (50 ± 10) °.

Fig. 1

in schematischer Seitenansicht einen Bürostuhl in Ruheposition,

Fig. 2

den Bürostuhl gemäß Fig. 1 in nach hinten zurückgeneigter Endstellung,

Fig. 3

in schematischer Seitenansicht eine alternative Ausführungsform eines Bürostuhls in Ruheposition, und

Fig. 4

den Bürostuhl gemäß Fig. 3 in nach hinten zurückgeneigter Endstellung.

Embodiments of the invention will be explained in more detail with reference to a drawing. Show:

Fig. 1

in a schematic side view of an office chair in rest position,

Fig. 2

the office chair according to FIG. 1 in the rearwardly inclined end position,

Fig. 3

in a schematic side view of an alternative embodiment of an office chair in rest position, and

Fig. 4

the office chair of FIG. 3 in the back zurückgeneigter end position.

Corresponding parts are in all figures with the same reference numerals Mistake.

The designed as an office chair chair 1 according to FIGS. 1 to 4 comprises a fixed with a stand, not shown, seat support 2. With the Seat support 2 is rotatably connected via a backrest handle 3, a backrest 4. The backrest 4 is from the rest position shown in Figures 1 and 3 tilted out backwards. The inclination of the backrest 4 takes place by a rotation about a pivot point D1. This is the with the backrest. 4 fixedly connected backrest links 3 are connected to the seat support 2 via an axis of rotation 5, wherein the pivot point D1 substantially through the central axis of this Rotary axis 5 is given.

In the embodiment according to FIGS. 1 and 2, the seat support 2 continues to be a seat surface 6 via a front first seat link 7 and a rear one second seat link 8 articulated. The front seat handlebar 7 is connected to the seat support. 2 via a hinge D2 and with the seat 6 via a rotary joint D3 rotatable connected. The pivot points D2 and D3 are again by appropriate Rotary axes realized 9 and 10, via which the front seat link 7 with the seat support 2 on the one hand and with the seat 6 on the other hand is rotatably connected. The rear seat link 8 is analogous on the one hand via a through a rotation axis eleventh realized pivot point D4 with the seat support 2 and on the other hand via a a rotation axis 12 realized pivot point D5 rotatably connected to the seat surface 6.

Both the front seat link 7 and the rear seat link 8 are arranged inclined. In this case, the inclination of the rear seat arm 8 relative to the vertical V greater than the inclination of the front seat handlebar 7. In the illustrated in Fig. 1 Rest position falls the vertical V with a seat 6 in a front Half 6a and a rear seat half 6b virtually dividing central longitudinal axis 13th together. Relative to this vertical central longitudinal axis 13 is the front Seat link 7 on the backrest 4 facing away from half 6a of the seat 6, while the second seat link 8 on the backrest 4 facing half 6b of the seat 6 is arranged. Both the front seat handlebar 7 as well at the rear seat handlebar 8, the distances are the upper, each with the seat 6 connected pivot points D3 and D5 to the backrest 4 smaller than the distances the lower, connected to the seat support 2 pivot points D2 and D4 to the backrest 4. The rear seat handlebar 8 is at least 25% longer as the front seat handlebar. 7

In addition, the rear seat link 8 in the rest position shown in FIG. 1 is flatter and therefore arranged more inclined than the front seat link 7. The inclination angle β of the rear (second) seat link 8 relative to the vertical V - in ungeeigter Position of the backrest 4 - is β = (45 ± 30) °, preferably about β = 45 °, the inclination starting from the seat support 2 upwards and backwards to the backrest 4 goes.

The backrest support 3 is connected to the seat surface 6 via a coupling link 14. This is with the backrest support 3 via a turn by a corresponding Fulcrum 15 given pivot point D6 and with the seat 6 on the Joint D5 connected. The coupling link 14 is opposite the vertical center longitudinal axis 13 in the rest position again inclined at an inclination angle α running arranged. Opposite the vertical V is the angle of inclination α in the rest position shown in Figures 1 and 3 with 0 ° <α <90 ° about 60 ° to 75 °, preferably (45 ± 10) °, in particular about 45 °. The inclination of the coupling link 14 extends in the reverse direction to the inclination of two seat stays 7 and 8.

If the backrest 4 by inclination to the rear in one shown in Fig. 2 Position brought so by this inclination of the backrest support 3 in a clockwise direction rotated and thus the coupling link 14 moves down a total. there the angle α decreases relative to the vertical V accordingly. In the end position is the coupling link axis 16, through the two pivot points D5 and D6 of the coupling link 14 runs, almost parallel to now compared to the vertical V inclined center longitudinal axis 13 of the seat 6th

Due to the inclination of the backrest 4 lower together with the fulcrum D5, the rear seat handlebar 8 and the seat 6 in its rear portion 6b from. Simultaneously with this, the front seat link 7 is also moved in a clockwise direction, whereby also the upper pivot point D3 of the front seat link 7 is lowered becomes. This lowering of the front upper pivot point D3 is less than that Lowering the rear upper pivot D5 of the seat 6, so this lowered overall and tilted clockwise. At the same time moves the front edge 17 of the seat 6 to the rear, with the required Length compensation by the front seat handlebar 7 takes place. The consequent Displacement of the front edge 17 of the seat 6 is shown in Fig. 1 by the arrow length 18 illustrates.

An alternative embodiment for realizing this length compensation is in Figs. 3 and 4 illustrates, in turn, a corresponding chair in Rest position or tilted position of the backrest show. In this embodiment is a slide guide 19 is provided instead of the front seat link. This is realized by a slot 20 in which one on the bottom 21st the seat 6 with this connected axis 10 'in the direction of the arrow 18' slidably is. The slot 20 is at the free end 22 of a support arm 23 of the seat support 2 provided. In this Auführungsform the leading edge 17 of the Seat 6 in zurückgeneigter end position of the backrest 4 in the direction of the raised in Fig. 4 arrow 24 shown.

LIST OF REFERENCE NUMBERS

1

chair

2

seat support

3

backrest link

4

backrest

5

axis of rotation

6

seat

6a

Front half

6b

Rear half

7

Front seat carrier

8th

Rear seat carrier

9.10

axis of rotation

10 '

axis

11.12

axis of rotation

13

central longitudinal axis

14

coupling link

15

axis of rotation

16

coupling axis

17

Front seat edge

18

length arrow

19

link guide

20

Long hole

21

Seat base

22

free end

23

support arm

24

length arrow

α, β

tilt angle

D1 to D6

pivot point

V

vertical

Claims (10)

1. Chair, in particular office chair, having a backrest (4) which is retained for inclining action on a seat carrier (2) via a backrest carrier (3), and having a seat surface (6) which can be moved synchronously with said backrest and is supported on the seat carrier (2) via a rear seat link (8) which is arranged in the region of the rear half (6b) of the seat surface (6), wherein a coupling link (14) is provided for synchronization between the movement of the backrest (4) and the movement of the seat surface (6), said coupling link being connected rotatably, on the one hand, to the seat surface (6) and, on the other hand, to the backrest link (3), characterized in that seat link (8), which is connected rotatably, on the one hand, to the seat surface (6) via a point of rotation (D5) and, on the other hand, to the seat carrier (2) via a bottom point of rotation (D4) is inclined, the distance between the top point of rotation (D5) and the backrest (4) being smaller than the distance between the bottom point of rotation (D4) and the backrest (4).
2. Chair according to Claim 1, characterized in that a front seat link (7), which is arranged in an inclined manner in the region of the front half (6a) of the seat surface (6), is connected rotatably, on the one hand, to the seat surface (6) via a top point of rotation (D3) and, on the other hand, to the seat carrier (2) via a bottom point of rotation (D2), the distance between the top point of rotation (D3) and the backrest (4) being smaller than the distance between the bottom point of rotation (D2) and the backrest (4).
3. Chair according to Claim 2, characterized in that the inclination of the rear seat link (8) is greater than the inclination of the front seat link (7).
4. Chair according to one of Claims 1 to 3, characterized in that at least one of the points of rotation (D5, D6) of the coupling link (14) is provided in the rear half (6b) of the seat surface (4), the rear half being directed toward the backrest (4).
5. Chair according to one of Claims 1 to 4, characterized in that the point of rotation of the coupling link (14) coincides with the point of rotation (D5), which connects the seat surface (6) to the seat link (8).
6. Chair according to one of Claims 1 to 5, characterized in that, with the backrest (4) not in an inclined rest position, the rear seat link (8) is inclined by an angle β = (45±30)° in relation to the vertical (V).
7. Chair according to one of Claims 1 to 6, characterized in that, with the backrest (4) not in an inclined rest position, the coupling link (14) is inclined by an angle of inclination 0° < α < 90° in relation to the vertical (V).
8. Chair according to Claim 7, characterized in that the angle of inclination α is approximately 45°, preferably α = (45 ± 10)°.
9. Chair according to Claim 7 or 8, characterized in that the inclination of the coupling link (14) is counter to the inclination of the rear seat link (8).
10. Chair according to one of Claims 7 to 9, characterized in that the inclination of the coupling link (14) is counter to the inclination of the front seat link (7).

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