DE102005020247B3 - Seating furniture, in particular office chair - Google Patents

Abstract

The invention relates to a chair, in particular an office chair. In order to provide a comfort advantage with a comparatively small design effort, which is comparable to that of a synchronous mechanism, a chair is proposed with a seat element (1) having a seat surface (9) and with a pivotable about a transverse axis (6), articulated the backrest element (2) connected to the seat element (1), wherein the seat surface (9) of the seat element (1) is designed such that a user during a pivoting of the back element (2) into a rear position can control the movement of the back element (2). Performing tracing movement. As a result, a synchronous movement of the user's body for movement of the back element is made possible without the entire seat element performing such a synchronous movement.

Description

The Invention relates to a chair, especially an office chair.

Out In the prior art so-called synchronous mechanisms are known. These are assemblies in the seat substructure of an office chair, the enable a correlated seat-backrest movement. seat support and backrests are included coupled so articulated that a Pivoting movement of the backrest to the rear, as for example by leaning on the chair user the backrest can be caused, a lowering movement of the trailing edge of the Seat down induced. This brings a considerable comfort advantage with you and is desirable for orthopedic reasons. One Disadvantage of these synchronous mechanisms is their relatively complicated mechanical Construction. As a result, synchronous mechanisms are also relatively expensive in their production.

From the DE 197 26 160 A1 is an office swivel chair known with a seat plate which is pivotable via a lever together with a backrest. By a corresponding adjustment of the articulation points of the lever while the pivot angle ratio of the seat plate and backrest can be adjusted by the user.

From the DE 36 34 055 A1 is an office chair with a split seat known. In an adjustment of a lever thereby pivots the rear seat part surface at a greater angle than the front seat part surface, causing postural damage is avoided.

A The object of the present invention is to provide a solution at a comparatively low design effort a comfort advantage which is comparable to that of a synchronous mechanism.

These Task is followed by a seating Claim 1 solved. Thereafter, a seat is provided, that only consists of two main assemblies, namely a preferably fixed Seat element and a back element consists, wherein the seat member has a seat and the back element about a transverse axis pivotally and hingedly connected to the seat element is. The seat is according to the invention designed that one User when pivoting the backrest to the back, such as This is for example by leaning the user against the back element is caused, a tracing the movement of the back element Movement performs. Due to the design of the seat takes place in other words upon pivoting of the backrest behind a lowering of the user down, without that Seat element moves as such. This will be a synchronous movement of the body the user to move the back element allows without that entire seat element performs such a synchronous movement. This leads both to a shift of the user's center of gravity as well a movement shift in the sense that the user with the help of Invention performs a movement that largely corresponds to the movement that a user at the Use of a corresponding synchronous mechanism would perform. With Help of the invention is based on simple design and therefore very cheap way achieves a comfort advantage associated with the a much more expensive synchronous mechanism is comparable. Especially the so-called "shirt pull-out effect" is effectively avoided.

advantageous Embodiments are specified in the subclaims.

According to one particularly advantageous embodiment The invention has the seat at least two, in the seat's longitudinal direction successively arranged seating areas, which extend through the Way of distinguishing their upholstery. Under the term Upholstery is understood as any elastic configuration of the seat, no matter what material is used. In addition to the use of molded foams are basically also any other elastic materials used, for example Spring packs or material combinations, such as Foam in combination with silicone pads. Also, for example, the Use of two-zone foam possible.

All It is particularly advantageous if at least one rear seating area has a padding, which in comparison with a front Seating area stronger Sinking of the user allows. at a movement of the user to the rear and an associated Loading of the seat in the rear area thus takes place simultaneously a "yielding" of the seat in other words, the rear seating area is designed in such a way that that at a load on the backrest slipping the user's pelvis into the padding Type of rolling done. This will be a particularly synchronous Movement between the back element and User scored.

Moreover, it is particularly advantageous if the back element is connected to the seat element via a pivot axis, which in Stuhllängs direction before attachment of the chair column is arranged on the seat element. The position of the pivot axis contributes significantly to the fact that an ergonomically very advantageous sitting is possible.

are Spring elements for biasing the back member provided, the are arranged substantially horizontally in the seat element, so can be achieve a particularly flat design. As spring elements are ever after design any springs, such as train or Compression springs, usable.

Further advantageous embodiments of the invention will be described with reference to an embodiment, that with the help of the drawings closer explained becomes. Hereby show:

1 a perspective view of the seat element without seat (first spring position),

2 a section through the seat element (first spring position),

3 a section through the seat element (second spring position),

4 a further section through the seat element (first spring position) with seat support,

5 another section through the seat element (second spring position).

The office chair according to the invention comprises a seat element 1 and a back element 2 , As in 2 shown, is the substantially horizontally arranged seat element 1 at a storage point 3 swiveling with the back element 2 connected. The back element 2 is in other words in the area of the bottom 4 of the seat element 1 hinged to this and performs, for example, when leaning the user to the back element 2 , a pivoting movement 5 around the pivot axis passing through the pivot bearing 6 , which are transverse to the chair's longitudinal direction 7 runs.

What kind of back element 2 it is, does not matter to the invention. For example, the back element 2 a backrest in the form of a shell, a net or the like.

The back element 2 can be transferred from its normal position shown in the figures in a rear position and back. To change the restoring force of the back element 2 is a spring force adjustment 8th provided, the exact operation will be explained later.

The seat element 1 on the one hand comprises the actual seat support with the articulation of the back element 2 and the spring force adjustment 8th , Characterized in that the pivot point of the mechanism very close to the seat 9 is arranged, the movement is in a movement of the back element 2 to the rear similar to a synchronous mechanism. In particular, the so-called shirt pull-out effect is reduced. In other words, the horizontal and vertical position of the pivot axis 6 relative to the seat element 1 or to the back element 2 for the achievable movement particularly crucial.

In addition, all other mechanical components in the seat element 1 integrated, such as the recordings 10 for armrests (not shown). The functional components seat support and mechanics form in other words a structural unit. The integrated and compact design of the seat element 1 gets special 1 clear. Particularly advantageous in this type is the cost-effective production. In addition, the number of required items is significantly reduced, which also reduces manufacturing costs and also increases the reliability.

In the seat element 1 is a cone in about the middle 11 provided, which serves to receive the upper end of a chair column, for example a gas spring (not shown).

The main body 12 of the seat element 1 consists essentially of a plastic plate with a number of chairs in the chair 7 and chair transverse direction 13 extending wall elements 14 , These serve not only to achieve the required stability of the seat element 1 , At the same time a significant material savings is possible. In addition, the wall elements meet 14 sometimes also other tasks. For example, they serve as a guide relationship or holding elements for the release rod 15 for adjusting the height of the gas spring, wherein the trigger bar 15 via a button 16 is actuated, which is also in the main body 12 is integrated. Also serve the wall elements 14 for holding and guiding the drive axle 17 the spring force adjustment 8th , being at the free end 18 the drive axle 17 a in 1 not shown actuating element, for example in the form of a handwheel, is mounted.

To retrieve the back element 2 from a rear position to its normal position serves a spring arrangement. The spring arrangement comprises two compression springs 19 with circular cross section, which in accordance with the basic body 12 provided spring retainers 20 einliegen.

Apart from the fact that the spring angle by the displacement of Federanlenkung upon actuation of the spring force adjustment 8th can be changed, are the springs 19 essentially horizontally in the seat element 1 a, which can be realized an extremely flat design. The low height allows for a visually appealing design of the chair. In addition, the use of different chair columns or gas springs is possible, so that special requirements can be met at seat heights.

The location of the two compression springs 19 is over a U-shaped round steel 21 changed, whose U-legs 22 in the two round springs 19 are introduced. About the movement of the "underground" 23 of the round steel 21 in deflection direction 24 become the compression springs 19 raised or lowered on one side while the opposite ends of the compression springs 19 by fixing the ends 25 of the round steel 21 at the base body 12 remain in their original position. For this lie the rounded ends 25 in a kind of ball socket 26 at the base body 12 one.

At a load of the back element 2 , so with a movement of the back element 2 in a rear position, push on the shaft 27 attached and from the bottom 4 through the main body 12 to the round bar 21 passing through lugs 28 against the springs 19 and thus provides an operative connection between the compression springs 19 and the back element 2 ago. The articulation lugs 28 are U-shaped as a guide formed such that they are the U-legs 22 of the round steel 21 take up.

When changing the spring force adjustment takes place via the rotation of the drive axle 17 a rotation of a worm wheel attached thereto 29 which is a rotation of a meshing gear 30 entails. The gear 30 is on a in deflection 24 , ie vertical thread axis 31 arranged on the threaded over a boom 32 is attached. The boom 32 has a U-shaped running driver 33 on top of the round bar 21 - depending on the direction in which the drive thing 17 is rotated - moves up or down. As a result, the position of the compression springs 19 from a lower first spring position ( 1 . 2 . 4 ) in an upper second spring position ( 3 . 5 ) changed. In other words, a "powerless" spring force adjustment is possible, only the position of the compression springs 19 and thus the angle of articulation changes. In other words, the Federkrafseinstellung taking into account the laws of the law of levers in that the compression springs 19 at different points of the articulation lugs 28 attack. By moving the articulation points in the direction of deflection 24 there is an extension or shortening of the lever arm, so that the round springs 19 be compressed more or less.

The upholstery 34 the seat 9 , see. 4 , consists of molded foam and is on a seat plate 39 attached to the appropriate recordings 40 of the basic body 12 can be mounted. Due to the special design of the padding 34 the user rolls quasi when moving the back element 2 backwards off. He slides into the foam. The foam must therefore towards the seat end 35 be free to stretch backwards. To achieve this, an upholstery will be open 34 , without limiting elements to the rear, preferred.

The seat 9 is in two different, in seat longitudinal direction 7 seating areas arranged one behind the other 36 . 37 divided, which differ by the way their padding. It is in the shape used in the present example, the seat 9 the front seating area 36 , which is about 30% to 40% of the total length of the upholstery 34 features a "normal" padding thickness, while the rear seating area 37 (between 70% and 60% of the total length) with a variable padding 34 is provided, which allows a sinking of the user towards the bottom rear. In the example shown, the cushion thickness of the rear seating area 37 opposite the cushion thickness of the front seating area 36 at least 20 mm increased. The way of transition from the front seating area 36 to the rear seating area 37 is preferably very soft and flowing and executed without edges. Particularly good results were with a transition area 38 achieved in the form of an elongated lying S The transition from the front seating area 36 to the rear seating area 37 is positioned such that, in a normal ("average") sitting posture, the user will substantially load the front seating area, then when the backrest is loaded, the user's pelvis will roll over the lying S to the rear seating area Backrest movement down the back.

1

seat element

2

back element

3

bearing point

4

Seat element base

5

pivotal movement

6

swivel axis

7

Chair longitudinally

8th

Tension adjustment

9

seat

10

armrests recording

11

cone holder

12

body

13

Chair transverse direction

14

wall element

15

trip bar

16

release button

17

drive axle

18

Drive axle free end

19

compression spring

20

spring mount

21

Round steel

22

U-leg

23

U-Grund

24

deflection

25

Round steel end

26

ball socket

27

wave

28

Anlenknase

29

worm

30

gear

31

threaded shaft

32

boom

33

takeaway

34

upholstery

35

Seat end

36

front sitting area

37

rear sitting area

38

Transition area

39

seat plate

40

admission

Claims (6)

Seating furniture, in particular office chair, with a fixed seat element ( 1 ), which has a seat ( 9 ) and with one about a transverse axis ( 6 ) pivotable, articulated with the seat element ( 1 ) connected back element ( 2 ), whereby the seat surface ( 9 ) of the seat element ( 1 ) is configured such that a user during a pivoting of the back element ( 2 ) in a rear position one the movement of the back element ( 2 ) performs traceable movement. Seating furniture according to claim 1, wherein the seat surface ( 9 ) at least two, in the seat longitudinal direction ( 7 ) seating areas arranged one behind the other ( 36 . 37 ), characterized by the way in which they are padded ( 34 ). Seating furniture according to claim 2, wherein at least one rear seating area ( 37 ) a padding ( 34 ) whose thickness is greater than the thickness of the padding of a front seating area ( 36 ) Such that unwinding of the user backwards down is made possible. Seating furniture according to claim 3, wherein the transition from the front seating area ( 36 ) to the rear seating area ( 37 ) has the shape of an elongate recumbent "S". Seating furniture according to one of claims 1 to 4, wherein the transverse axis ( 6 ) in chair longitudinal direction ( 7 ) before fixing ( 11 ) of the chair column is arranged. Seating furniture according to one of claims 1 to 5, with a substantially horizontal position in the seat element ( 1 ) arranged spring elements ( 19 ) for biasing the back element ( 2 ).