EP1306033A2 - Chair - Google Patents

Abstract

The chair has one or more support element fixings (17) at the rear end of the seat cushion, for securing respective elastic support elements (18), each provided with a coil spring element (20) extending along its length and used for supporting a number of vertically spaced shaped.elements (21) extending across the width of the seat backrest, which can be coupled together via vertical elastic stiffening elements (26). The lower shaped elements and/or the stiffening elements are coupled to one or more pivot levers (27), with a limited pivot movement, adjusted via a setting element (30).

Description

The invention relates to a chair, in particular an office or work chair with movable seat and / or movable backrest.

Chairs with a movable seat and / or movable backrest are described several times in the prior art.
So one tried with the solution presented in DE OS 41 35 948 to develop a chair that allows the transfer to the most comfortable rest position possible.
In order to avoid the "shirt pull-out effect" inherent in previous designs, which is caused by the downward or upward movement of the back along the backrest, a backrest consisting of a shell-shaped component is used.
The backrest support is moved independently of the seat support.
The synchronous mechanism used in connection with the sliding mechanism of the seat surface of the solution presented in DE OS 41 35 948 inevitably has the effect that when the seat surface is "moved back", it lifts anatomically to the rear, but since the backrest folds forward at the same time, this can be caused by the transformation geometry Predefined body opening angles cannot be varied independently of the seating surface position, so that the internal organs are inevitably “pinched” by means of this design. Due to the shell-shaped design of the backrest, anatomically correct support of the deformed spine is also not guaranteed.
Since the back is also supported in a higher section when leaning back in relation to an upright sitting position in the back shell, the lower end of the backrest is pressed into the lumbar region of the seated person as a result of the pivotable mounting of the backrest chosen in this solution, so that with this design one Variable, anatomically correct, elastic support of the upper body in the lumbar area when leaning back cannot be realized, whereby anatomically correct, torsion-like turning of the backrest is not possible in any sitting position.
DE 100 50 430 A1 presents a chair with a movable seat and movable backrest, in which two support element fastenings are arranged in the rear area of the seat cushion, in each of which a flexible support element is fastened, with compression spring elements (20) and over each support element the back width-extending form elements (21) are arranged alternately one above the other. By means of this solution, torsion-like twisting and anatomically correct bending of the backrest is possible, so that an elastically supported twisting of the back can be made possible with a simultaneously elastically supported variation of the body opening angle.
The main disadvantage of this design, however, is that the respective support forces or support moments cannot be varied in a user-defined manner.

Due to the disadvantages of the current state of the art the object of the present invention is an aesthetic demanding chair, especially an office or work chair too develop that is inexpensive to manufacture and reliable, one on the Height and thus also individually adjustable to the body weight, anatomical, optimal, also dependent on the respective working posture elastic adjustment of the support function enables and therefore in everyone any seating position, regardless of the seating position adjustable elastically supported variation of the body opening angle with elastic support in the lumbar area with simultaneous elastic supported rotation of the back should be guaranteed.

According to the invention, this problem is solved by a chair, in particular a chair Office or work chair, with movable seat and movable backrest, and arranged / arranged in the rear area of the seat cushion Support element attachment (s) (17) in or on each of which a flexible elastic Support element (18) is fastened, wherein along each support element (18) Compression spring elements (20) and extending over the back width Shaped elements (21) alternately one above the other alternately are arranged, which is characterized in that the lower Shaped element (21) / or several of the lower shaped elements (21) with each other by means of one or more arranged symmetrically to the center flexurally elastic / flexurally elastic stiffening element / stiffening elements (26) connected to one or more swivel levers (27) is / are which in one or more associated with the seat frame (5) and / or bearings (15) arranged on an adapter element (35) is / are pivotably mounted, with each pivoting lever (27) Travel limiting / preloading element (28) and on the seat frame (5) or the adapter element (35) with Travel limiting / prestressing element (28) operatively connected stop (29) is arranged and that the stroke / the preload of the respective Path limiting / prestressing element with respect to the stop (29) by means of a Adjusting element (30) is adjustable.

By means of the solution according to the invention, it has been possible to develop an aesthetically demanding chair, in particular an office or work chair, which can be produced inexpensively and is functionally reliable, an anatomically appropriate adjustment to the body size and thus also to the body weight, and also dependent on the respective working posture. optimal, elastic adjustment of the support function enables and in any sitting position regardless of the seating position to adjust the "hardness" of the elastic backrest to the individual needs of the user, so that an individually adjustable to the body size and thus the body weight, anatomically appropriate, also from Depending on the respective working posture, optimal, elastic adjustment of the support function can be made possible, with an individually adjustable elastically supported in any seating position regardless of the seating position zte variation of the body opening angle with elastic support in the lumbar area while simultaneously elastically supported torsion of the back can be guaranteed.
The special arrangement of only one stiffening element (26) according to the invention has the effect, for example, that when the patient leans back, anatomically appropriate, flexurally elastic adjustable support of the upper body can be realized with elastic support in the lumbar region with simultaneous elastically supported torsion of the back.
If, for example, two stiffening elements (26) are used symmetrically along the backrest, the support of the upper body when leaning back can also be varied simultaneously while supporting the upper body.
If, on the other hand, three stiffening elements (26) are used along the backrest, for example one in the middle and the other two symmetrically to this, the support of the upper body when leaning back can be varied independently of the support of the upper body when twisting.
It is also essential to the invention that the adapter element (35) is attached to the seat frame (5) and / or to the cushion plate (8).
As a result, the backrests according to the invention can be combined without any seat mechanism, but also with any seat mechanism, both with and without armrests.
It is characteristic that the adapter element (35) consists of two carrier bars (36), a connecting web (37) arranged between these carrier bars (36) and a molded part (38) arranged above the carrier bars (36) and the connecting web (37).
The rigid connection of these modules to one another ensures an aesthetically demanding, inexpensive and functionally reliable fastening of the functional modules to the adapter element (35).
It is also essential to the invention that the carrier bars (36) and the connecting web (37) are connected to the cushion plate (8) from below, and the molded part (38) is rigid from the rear. This ensures a functionally reliable, aesthetically demanding attachment of the adapter element to the cushion plate (8).
It is also characteristic that the guide groove and / or the link guide are each worked into the side cheek of the seat frame from the inside.
This eliminates the risk of injury to the chair's gear assemblies.
Another feature of the invention is that an elongated hole is arranged in the side cheek of the seat frame, in which an arrestable tensioning element is slidably mounted in the elongated hole, which is arranged with one in the area of the intermediate plate on the tensioning element
Actuating element acts in the clamped state on the intermediate plate and thus limits the mutual relative movement between the intermediate plate and the seat frame.
This makes it possible to limit the "swivel mechanism" of the seat in this end position in any seating position.

Other features of the invention emerge in addition to the wording of the Claims, also in conjunction with the accompanying drawings, from the the following explanations of the two exemplary embodiments.

The invention is now described in two exemplary embodiments in Connection with three figures explained in more detail.

Figur 1 :

eine mögliche Bauform des erfindungsgemäßen Stuhles in einer perspektivischen Ansicht schräg von vorn;

Figur 2 :

den erfindungsgemäßen Stuhl gemäß Figur 1 im Teilschnitt in der Seitenansicht;

Figur 3 :

die Verstelleinheit des erfindungsgemäßen Stuhles in einer weitere Bauform in einer perspektivischen Ansicht schräg von hinten.

Show:

Figure 1:

a possible design of the chair according to the invention in a perspective view obliquely from the front;

Figure 2:

the chair of Figure 1 in partial section in side view;

Figure 3:

the adjustment unit of the chair according to the invention in a further design in a perspective view obliquely from behind.

Figure 1 shows the chair according to the invention in a perspective view obliquely from the front. A height-adjustable spring 2, preferably a gas spring, is arranged on a base frame 1 provided with rollers 25.
On a seat frame 5, the cushion plate 8 with the seat cushion and on both sides of the seat frame 5, an armrest support 12 with a height adjustment 13 and an armrest 14 are arranged.
These armrests 14 arranged on both sides of the seat frame 5 are telescopically height-adjustable due to their height adjustment 13 and enable an optimal and at the same time cost-effective adjustment of the armrest height to any support height that is comfortable for the respective use.
Also arranged on the seat frame are a rotary knob 24 for adjusting the adjustment hardness of the seat adjustment mechanism and a tensioning element 32 mounted in an elongated hole 31 in the side wall 19 of the seat frame 5 for limiting the end position of the seat adjustment mechanism.
Behind the seat cushion, two flexurally elastic support elements 18, for example consisting of glass fiber rods, are arranged on the seat frame 5 symmetrically to the center axis of the chair.
On the flexurally elastic support elements 18 are adjacent to one another, for example made of elastic plastic (eg PUR foam) compression spring elements 20 and extending over the back width shaped elements 21 are arranged alternately one above the other.
The shaped elements 21 extending across the back width are preferably geometrically different in some areas.
A special anatomical, but also an individual aesthetic design can be taken into account.
As shown in FIG. 1, upholstery elements 34 are incorporated into these wooden form elements 21.
As a result of a special, different cross-sectional design of the shaped elements 21, all deformation states (torsion and
Deflection) of the back system with simultaneous, elastically supported variation of the body opening angle "forced" an optimal, anatomically correct sitting position.
In this embodiment, as also shown in FIG. 1, a headrest 22 is fastened to the upper shaped element 21.
FIG. 2 shows the chair according to the invention in partial section in a side view.
An intermediate plate 3 is arranged at the free end of the spring 2. Two guide rollers 4 are arranged on both sides of this intermediate plate 3. These guide rollers 4 are slidably arranged in the front in the horizontal guide grooves 6 and in the rear in the arcuate link guides 7 of the side cheeks 19 of the seat frame 5.
The guide grooves 6 and the arcuate slide guides 7 are each machined from the inside into the side cheek 19 of the seat frame 5, the guide grooves 6 and also the slide guides 7 being worked into a side cheek 19 with a thickness of, for example, 24 mm, for example about 15 mm deep.
As a result of these grooves, which are not visible from the outside, there is no danger of injury to the gear assemblies of the chair.
The cushion plate 8 with the seat cushion is arranged on the seat frame 5. A biasing element 9 is also attached to the seat frame 5 and can be actuated by means of the rotary knob 24. As can be seen in the half section, a spring element 11 is arranged between the prestressing element 9 and a fastening element 10 arranged on the intermediate plate 3. This makes it possible to optimally adjust the resilient seat adjustment resistance to the respective body weight, whereby as a result of the present solution, in any sitting position alone, a variation in the sitting position is possible simply by shifting the weight when sitting, such that the chair according to the invention can be used both when leaning back and when forward An almost constant distance between the body and the edge of the desk is always bent over the desk, so that it is possible to continue working at the desk in any sitting position without having to move the entire chair (towards the desk or away from the desk).
Behind the seat cushion, two support element fastenings 17 in the form of fastening bores 23 with or without insert sleeves are arranged on the seat frame 5 (as far as into the side cheeks 19) symmetrically to the center axis of the chair.
The flexurally elastic support elements 18, for example consisting of glass fiber rods, are arranged in these.
On the flexurally elastic support elements 18, as already mentioned in the explanations in connection with FIG. 1, compression spring elements 20 consisting of PUR foam sleeves are arranged adjacent to one another and shaped elements 21 which extend over the back width, are identical in some areas or have different dimensions, are arranged alternately one above the other.
The lower form elements 21 are connected to one another by means of a resilient stiffening element 26 arranged symmetrically to the center between the support elements 18 (see also FIG. 1), which is arranged on a pivot lever 27 pivotably mounted between the support elements 18 on the seat frame 5 on two bearings 15 by means of an axis 16 is.
A travel limiting / pretensioning element 28 is arranged on the pivot lever 27 and a stop 29 which is in operative connection with the travel limiting / pretensioning element 28 is arranged on the seat frame 5.
The stroke of the travel limiting / biasing element 28 can, as shown in FIG. 2, be adjusted relative to the stop on the seat frame 5 by means of an adjusting element 30.
The arrangement of the support element 18 has the effect that, when leaning back, an anatomically correct, elastic support of the upper body in the lumbar region can be realized, the "hardness" of the lumbar support also being able to be adapted to the respective needs of the user by means of the adjusting element 30, so that due to the arrangement according to the invention when leaning back a variable, anatomically appropriate, elastic support of the upper body in the lumbar region is realized.
In the side wall 19 of the seat frame 5 there is also an elongated hole 31 in which, as shown in FIG. 1, a lockable clamping element 32 is slidably arranged.
By means of this displaceable and lockable clamping element 32, the actuating element 33 shown in FIG. 2 and arranged in the "working area" of the intermediate plate 3 on the clamping element 32 can be clamped at any point in the elongated hole 31 of the side cheek 19 of the seat frame 5.
Corresponding to the respective locking of the clamping element 32 in the elongated hole 31, the actuating element 33 arranged on the clamping element 32 hinders the “work path” or the “stroke” of the intermediate plate, so that the mutual relative movement between the intermediate plate 3 and the seat frame 5 is restricted in a defined manner.
It is thus possible to limit the "swivel mechanism" of the seat surface in any seating position in this end position.
FIG. 3 shows the adjustment unit of the chair according to the invention in a further design in a perspective view obliquely from behind.
The adapter element 35 is fastened to the cushion plate 8.
This adapter element 35 consists of two carrier bars 36, a connecting web 37 arranged between these carrier bars 36 and a molded part 38 arranged above the carrier bars 36 and the connecting web 37.
The carrier bars 36 and the connecting web 37 are rigid with the cushion plate 8 from below, and the molded part 38 is rigidly connected to the cushion plate 8 from behind.
At least the lower mold element 21 is / are connected (but also several of the lower mold elements 21 can be connected to one another) with the pivot lever 27 by means of a centrally arranged flexible elastic stiffening element 26.
In the adapter element 35, two support element fastenings 17 projecting through the molded part 38 into the carrier bars 36 are arranged. The flexible support elements are fastened in these. Between the molded part 38 of the adapter element 35 and the lower molded element 21, a compression spring element 20 is placed on each of the two support elements 18. A pivot lever 27 is pivotally mounted on the molded part 38 of the adapter element 35 centrally between the two support elements 18 by means of a bearing 15 and an axis 16 arranged in this bearing 15. A travel limiting / biasing element 28 is arranged on the pivot lever 27. On the connecting web 37 there is a stop 29 which is in operative connection with the travel limiting / prestressing element 28.

The stroke / the pretension of the travel limiting / pretensioning element 28 can be adjusted relative to the stop 29 by means of an adjusting element 30.
By means of the variation of the stroke / the pretension of the travel limiting / pretensioning element 28, an anatomically appropriate, anatomically appropriate, also dependent on the respective working posture, optimal, elastic adjustment of the support function is made possible, so that in any one Sitting position, regardless of the seating position, an individually adjustable, elastically supported variation of the body opening angle with elastic support in the lumbar area can be guaranteed with an elastically supported twisting of the back.
The armrest supports 12 and the seat mechanism 39 are also arranged on the seat plate 8.

REFERENCE SYMBOL

1

base frame

2

feather

3

intermediate plate

4

guide rollers

5

seat frame

6

guide

7

link guide

7

pad plate

9

biasing member

10

fastener

11

spring element

12

arm rest support

13

height adjustment

14

armrest

15

camp

16

axis

17

Support element mounting

18

support element

19

side cheek

20

Compression spring element

21

forming element

22

headrest

23

mounting hole

24

knob

25

castors

26

stiffener

27

pivoting lever

28

Limit / preload element

29

attack

30

adjustment

31

Long hole

32

clamping element

33

actuator

34

cushion element

35

adapter element

36

support beam

37

connecting web

38

molding

39

seat mechanism

Claims (6)

Chair, in particular office or work chair, with a movable seat and movable backrest, and in the rear area of the seat cushion arranged / arranged support element fastening (s) (17) in or on which a flexible support element (18) is fastened, whereby along each support element ( 18) compression spring elements (20) and shaped elements (21) extending across the back width are arranged alternately one above the other, characterized in that the lower shaped element (21) / or more of the lower shaped elements (21) are symmetrical to one another by means of one or more to the center arranged elastic / flexible elastic stiffening element / stiffening elements (26) is / are connected to one or more pivot levers (27) which are arranged in one or more associated with the seat frame (5) and / or on an adapter element (35) Bearings (15) is / are pivoted, with the respective Sch pivot lever (27) is a path limiting / biasing element (28) and on the seat frame (5) or the adapter element (35) with the path limiting / biasing element (28) in operative connection stop (29) is arranged, and that the stroke / The pretension of the respective travel limiting / pretensioning element with respect to the stop (29) can be adjusted by means of an adjusting element (30). Chair according to claim 1, characterized in that the adapter element (35) is attached to the seat frame (5) and / or to the cushion plate (8). Chair according to claim 1, characterized in that the adapter element (35) consists of two carrier bars (36), a connecting web (37) arranged between these carrier bars (36) and a molded part (above the carrier bars (36) and the connecting web (37)) 38) exists. Chair according to claim 1, characterized in that the support bars (36) and the connecting web (37) from below, and the molded part (38) are rigidly connected to the cushion plate (8) from the rear. Chair according to claim 1, characterized in that the guide groove (6) and / or the link guide (7) are each machined from the inside into the side cheek (19) of the seat frame (5). Chair according to claim 1, characterized in that an elongated hole (31) is arranged in the side cheek (19) of the seat frame (5), in which an arrestable tensioning element (32) which is displaceably mounted in the elongated hole (31) and which is provided with a in the area of the intermediate plate (3) on the tensioning element (31) arranged actuating element (33) acts on the intermediate plate (3) in the tensioned state and thus limits the mutual relative movement between the intermediate plate (3) and the seat frame (5).

Images