EP3817628B1 - Chair - Google Patents

Description

The invention relates to a chair according to the preamble of patent claim 1.

A chair of the type mentioned is from the patent document JP2000116458A or the patent document DE 10 2007 059 985 B3 known. These chairs consist of a chair base on which a seat and a backrest connected to the seat via a synchronous mechanism are movably mounted, with a spring pressing the seat into a basic position of the chair and an abutment rotatably mounted on the chair base being provided, the abutment being designed to interact on the one hand with a connecting element connected to a front edge of the seat and on the other hand with one end of the spring. The spring is also designed to be positionable in different positions on the abutment for setting an effective spring force. In addition, with this solution, the front edge of the seat and also the abutment are arranged on a front seat link, which in turn is pivotably mounted on the chair base.

The object of the invention is to improve a chair of the type mentioned at the outset. In particular, a chair is to be created in which, in contrast to the aforementioned prior art, the front edge of the chair does not lift when the backrest is loaded.

This object is achieved with a chair of the type mentioned by the features listed in the characterizing part of patent claim 1.

Furthermore, it is therefore provided that the connecting element interacting with the abutment is designed to be guided in a longitudinal guide and is arranged in the basic position of the seat in a highest position of the longitudinal guide.

In other words, the chair 10 is characterized in that the front edge of the seat is not raised when the chair is loaded thanks to the longitudinal guide and despite the simultaneous adjustability of the spring force via a rotatably mounted abutment. As will be explained in more detail, the longitudinal guide is either completely horizontal when the chair is in an upright position (then the connecting element is in a highest position of the longitudinal guide in every position) or the longitudinal guide is designed to slope gently in comparison to the horizontal, starting from the highest position in the basic position, so that the front edge of the seat lowers at most when the chair is loaded, but never rises.

Particularly preferably, it is also provided, which will also be discussed in more detail below, that the abutment has teeth on the longitudinal guide side and that between the longitudinal guide and the teeth for force transmission between the spring and the seat an intermediate member, also called a force transmission device, which is also toothed on the toothed side and is pivotably mounted to the longitudinal guide, is arranged.

Other advantageous developments emerge from the dependent patent claims.

The chair according to the invention, including its advantageous developments according to the dependent patent claims, is explained in more detail below with reference to the graphic representation of a preferred exemplary embodiment.

Figur 1

perspektivisch im Schnitt die Synchronmechanik in unbelasteter Stellung mit einer "weich" wirkend eingestellten Feder;

Figur 2

perspektivisch im Schnitt die Synchronmechanik gemäß Figur 1 in belasteter Stellung mit der "weich" wirkend eingestellten Feder;

Figur 3

perspektivisch die Synchronmechanik gemäß Figur 1 in unbelasteter Stellung mit einer "hart" wirkend eingestellten Feder;

Figur 4

perspektivisch im Schnitt die Synchronmechanik gemäß Figur 1 in belasteter Stellung mit der "hart" wirkend eingestellten Feder;

Figur 5

der erfindungsgemäße Stuhl, bei dem sich die in den Figuren 1 bis 4 dargestellte Synchronmechanik unterhalb des Sitzes bzw. der Sitzfläche befindet;

Figur 6

perspektivisch im Schnitt die Synchronmechanik gemäß Figur 3 in unbelasteter Stellung mit einer "hart" wirkend eingestellten Feder;

Figur 7

in Seitenansicht einen Teil der Synchronmechanik gemäß Figur 1 in unbelasteter Stellung mit einer "weich" wirkend eingestellten Feder;

Figur 8

in Seitenansicht einen Teil der Synchronmechanik gemäß Figur 1 in belasteter Stellung mit einer "weich" wirkend eingestellten Feder;

Figur 9

als perspektivische Explosionsdarstellung das Widerlager gemäß Figur 1 insbesondere mit dem Stell- 5 element (schematisch) und dem Stellrad;

Figur 10

perspektivisch einen Teil der Synchronmechanik gemäß Figur 1, insbesondere des Widerlagers in unbelasteter Stellung (in dieser Position kann die Federkraft eingestellt werden) mit einer "weich" wir- 10 kend eingestellten Feder;

Figur 11

perspektivisch und im Schnitt einen Teil der Synchronmechanik gemäß Figur 1, insbesondere die Stellstange mit Zapfen und die Drehwelle mit Kurvenführung in belasteter Stellung; 15

Figur 12

perspektivisch und im Schnitt einen Teil der Synchronmechanik gemäß Figur 1, insbesondere die Stellstange mit Zapfen und die Drehwelle mit Kurvenführung in unbelasteter Stellung;

Figur 13

perspektivisch und im Schnitt einen Teil der Syn- 20 chronmechanik gemäß Figur 1, insbesondere den Rastmechanismus bei unbelastetem Stuhl und damit in Öffnungsstellung; und

Figur 14

perspektivisch und im Schnitt einen Teil der Synchronmechanik gemäß Figur 2, insbesondere den Rast- 25 mechanismus bei belastetem Stuhl und damit in Blockadestellung.

It shows

figure 1

Perspective in section the synchro-mechanism in unloaded position with a "soft" acting adjusted spring;

figure 2

Perspective in section according to the synchro-mechanism figure 1 in the loaded position with the "soft" acting adjusted spring;

figure 3

perspective according to the synchronous mechanism figure 1 in the unloaded position with a "hard" acting adjusted spring;

figure 4

Perspective in section according to the synchro-mechanism figure 1 in the loaded position with the spring set to act "hard";

figure 5

the chair according to the invention, in which the in the Figures 1 to 4 shown synchro-mechanism is below the seat or the seat;

figure 6

Perspective in section according to the synchro-mechanism figure 3 in the unloaded position with a "hard" acting adjusted spring;

figure 7

in side view a part of the synchro-mechanism according to figure 1 in the unloaded position with a "soft" acting adjusted spring;

figure 8

in side view a part of the synchro-mechanism according to figure 1 in the loaded position with a "soft" acting set spring;

figure 9

as a perspective exploded view of the abutment according to figure 1 in particular with the setting 5 element (schematic) and the setting wheel;

figure 10

in perspective according to a part of the synchronous mechanism figure 1 , in particular of the abutment in the unloaded position (the spring force can be adjusted in this position) with a spring set to have a "soft"effect;

figure 11

in perspective and in section according to a part of the synchro-mechanism figure 1 , in particular the adjusting rod with pin and the rotary shaft with cam guide in the loaded position; 15

figure 12

in perspective and in section according to a part of the synchro-mechanism figure 1 , in particular the control rod with pin and the rotary shaft with cam guide in the unloaded position;

figure 13

Perspectively and in section according to a part of the synchronous 20 mechanism figure 1 , in particular the latching mechanism when the chair is unloaded and thus in the open position; and

figure 14

in perspective and in section according to a part of the synchro-mechanism figure 2 , In particular the latching 25 mechanism when the chair is loaded and thus in the blocked position.

The in the Figures 1 to 14 The chair shown consists, in a known manner, of a chair base 1, preferably provided with a foot 20, on which a seat 2 and a backrest 3 connected to the seat 2 via a synchronous mechanism are movably mounted, with a spring 4 pressing the seat 2 into a basic position of the chair and an abutment 5 rotatably mounted on the chair base 1, the abutment 5 being designed to interact on the one hand with a connecting element 7 connected to a front edge of the seat 2 and on the other hand with one end of the spring 4.

As can be seen from the figures, two seat supports 10 connected to one another via the connecting element 7 are particularly preferably provided, with the chair base 1 being arranged between the two seat supports 10 and the connecting element 7 being slidably mounted on the chair base 1 .

Furthermore, it is preferably provided that a backrest support 9 pivotable about a horizontal axis is mounted on the chair base 1 .

Furthermore, the backrest support 9 and the two seat supports 10 are preferably connected to one another via two swivel joints 11 which can be moved independently of the chair base 1 and have horizontal axes.

In addition, it is preferably provided that the connecting element 7 operatively connected to the seat 2 via the seat carrier 10 is operatively connected to the abutment 5 for the spring 4 .

What is essential for this chair is that the connecting element 7 interacting with the abutment 5 is designed to be guided in a longitudinal guide 8 and is arranged in the basic position of the seat in a highest position of the longitudinal guide 8 . As already explained above, this requirement enables the Creation of a chair in which the front edge practically does not lower even under load.

Considered a little more closely, it is particularly preferred that the longitudinal guide 8 for the connecting element 7 when the chair is in use is formed so that it falls away, viewed from a front edge of the seat 2 in the direction of the backrest 3 .

As can be seen from the figures, it is further provided that the abutment 5 has a bearing surface 5.1 on which one end of the spring 4 can be positioned in different positions for setting an effective spring force. In this case, it is also particularly preferred that an actuating element 6, which exclusively transmits tensile forces, is provided for fixing the position of one end of the spring 4 on the bearing surface 5.1.

Looking at it a little more closely, it is particularly preferred that the actuating element 6 is designed either as a chain (see FIGS. 1 to 14) or as a cable (not shown separately).

To guide the actuating element 6, a groove 16 is particularly preferred on the abutment 5 (see in particular figure 9 ) intended. This is made wider than the actuating element 6 so that it is mounted in the groove 16 so that it can be displaced transversely.

Furthermore, an adjusting wheel 17 for adjusting the adjusting element 6 is particularly preferably provided on the abutment 5 and has an axis of rotation that runs horizontally when the chair is used. It is further particularly preferred that the adjusting wheel 17 is arranged on a rotating shaft 22 which is mounted on the abutment 5 so that it can rotate if necessary.

With regard to the longitudinal guide 8, it is also particularly preferred that, when the chair is in an upright position, it is designed to fall away from a front edge of the seat 2 in relation to the horizontal at an angle of around 10° towards the backrest 3. Furthermore, it is preferably provided that the longitudinal guide 8 is semicircular at both of its ends, matching the connecting element 7, which is designed as a cylindrical rod.

With regard to the spring 4 mentioned at the beginning, which is particularly preferably designed as a helical compression spring and/or in the interior of which a telescopic guide 14 is arranged, it is also particularly preferred that one end of the spring 4 is connected to the abutment 5 and another end of the spring 4 is connected to a rotary bearing 12 provided on the chair base 1. Here, the spring 4 is designed to be rotatably mounted about a horizontal axis about the pivot bearing 12 , viewed in somewhat more detail.

Furthermore, as can be seen from the figures, a second spring 18, preferably also designed as a helical compression spring, is particularly preferably arranged between the connecting element 7 and the chair base 1 to specify a defined pretension, in the interior of which a telescopic guide 19 is preferably also arranged. Ultimately, this makes it advantageously possible to make the adjustable spring 4 and thus also the abutment 5 smaller. In particular, however, a basic tension is generated that keeps the chair in the front position despite the seat load, so that the spring force can be changed without the adjustment being blocked (see ratchet wheel and blocking element). As can also be seen from the figures, it is particularly preferably provided that the longitudinal axes (along which the compression of the springs takes place) of the spring 4 and the second spring 18 lie in mutually parallel planes.

To fasten the above-mentioned abutment 5, a pivot bearing 15 is particularly preferably provided on the chair base 1 (see in particular figure 10 ). This rotary bearing 15, which preferably has a horizontal axis of rotation when the chair is in the upright position, is also arranged on an end of the abutment 5 facing away from the seat.

According to the invention, it is provided that the pivot bearing 15 is arranged at one end of the abutment 5 and the connecting element 7 is designed to act on the other end of the abutment 5 .

Furthermore, it is particularly preferably provided that the above-mentioned bearing surface 5.1 of the abutment 5, which is preferably divided into two elongated partial surfaces by the above-mentioned groove 16, is designed to be concavely curved towards the spring 4. In addition, it is preferably provided that the spring 4 is formed at its abutment-side end with a slide 13 that is displaceable relative to the bearing surface 5.1 butting against the bearing surface 5.1. For this purpose, it is also particularly preferred that the carriage 13, which is preferably designed to be firmly connected to the actuating element 6, is designed with a convex curvature on the abutment side to match the bearing surface 5.1.

The figures show that twisting the abutment 5 about its pivot bearing 15 causes the spring 4 to be compressed. In addition, it is particularly preferred that with a predetermined displacement of the connecting element 7, a position of the spring 4 adjacent to the pivot bearing 15 of the abutment 5 causes less compression of the spring 4 than a position of the spring 4 at a distance from the pivot bearing 15.

Furthermore, it is particularly preferably provided that the bearing surface 5.1 is provided with a stop for the spring 4 or the carriage 13, viewed in both directions of adjustment of the spring 4.

To transmit the forces coming from the seat 2 and acting on the spring 4 , a force transmission device 21 is also arranged between the connecting element 7 and the abutment 5 . This serves, as can be seen in particular from the Figures 7 and 8 and the following description shows that the introduction of the force from the connecting element 7 to the abutment 5 always takes place parallel to the longitudinal guide 8 and thus practically without losses due to the toothing of the force transmission device 21, which is still to be explained.

Considered in more detail, it is particularly preferred that the abutment 5 has a first toothing 5.2 with preferably at least three teeth on the force transmission device side, that the force transmission device 21 has a second toothing 21.1 with preferably at least four teeth on the abutment side and that the two toothings 5.2, 21.1 each have a convex curvature relative to one another and are designed to be at least partially in engagement with one another.

Furthermore, it is particularly preferably provided that the abutment 5 is arcuate, in particular arcuate, and the power transmission device-side toothing 5.2 is arranged on a convex outside and the bearing surface 5.1 for the spring 4 is arranged on a concave inside of the abutment 5.

Furthermore, as can also be seen from the figures, it is preferably provided that the force transmission device 21 is designed to be mounted on the connecting element 7 so as to be rotatable about an axis that is horizontally oriented when the chair is in the upright position. Considered in more detail, it is particularly preferred that the force transmission device 21 has a cylindrical through-opening that encloses the connecting element 7, in particular the aforementioned rod.

In addition, it is preferably provided that the force transmission device 21 is formed from two parts, each with a second toothing 21.1, leaving a free space for the actuating element 6 between them.

As the comparison of the figures shows, it is further particularly preferred that a displacement of the connecting element 7 causes a displacement and rotation of the force transmission device 21 . In addition, it is provided that a displacement and twisting of the force transmission device 21 causes a twisting of the abutment 5 about its pivot bearing 15 .

Furthermore, it is particularly preferably provided that the adjusting element 6, which is preferably designed to be closed in itself, is guided around the abutment 5 or is designed to enclose this and preferably also the adjusting wheel 17 to be explained below.

As can be seen from the figures, this adjusting wheel 17 is particularly preferably designed as a chain wheel (see also https://de.wikipedia.org/w/index.php?title=Kettenrad&oldid=177 726929). Alternatively (not shown separately), it is provided that the adjusting element 6 is designed as a rope, in particular a wire rope, and the adjusting wheel 17 has a guide groove that matches the rope and prevents the rope from slipping (in addition, cylinders or the like can be attached to the rope, for example, to prevent the adjusting wheel 17 from slipping). In both solutions it is preferably provided that the adjusting wheel 17 has an axis of rotation running parallel to the pivot bearing 15 of the abutment 5 .

To actuate the adjusting wheel 17, an adjusting mechanism is also particularly preferably provided, to which in particular the rotary shaft 22 mentioned above belongs.

With regard to this, it is also preferably provided that this is designed to be slidably mounted on the abutment 5 between two axial positions.

Furthermore, a spring element 23 for shifting the rotary shaft 22 into a first axial position is particularly preferably provided. In addition, a first locking element 22.1 is particularly preferably provided on the rotary shaft 22, which in the first axial position with a provided on the abutment 5, second Latching element 5.3 is designed to work together. The two locking elements 22.1, 5.3 are particularly preferably designed as crown gear teeth (see also https://de.wikipedia.org/w/index.php?title=Kronenrad&oldid=174349785). In addition, as in particular from the Figures 9 and 10 As can be seen, it is particularly preferred that the crown wheel toothing is designed as a sawtooth toothing, in such a way that in any case a movement of the carriage 13 on the bearing surface 5.1 in the direction of the pivot bearing 15 is or will be reliably prevented.

Furthermore, an actuating rod 24 operatively connected to the rotary shaft 22 is preferably provided. In addition, an adjusting mechanism is preferably provided to bring about an axial displacement of the rotary shaft 22 into a second axial position. This is preferably formed from a pin 24.1 provided on the actuating rod 24 and from a cam guide 22.2 provided on the rotary shaft 22 and cooperating with the pin 24.1. In addition, the rotary shaft 22 preferably has a through-bore through which a part of the actuating rod 24 passes. Furthermore, the actuating rod 24 is preferably rotatable but mounted on the abutment 5 in an axially non-displaceable manner.

As can be seen from the figures, a rotary movement on the actuating rod 24 causes the pin 24.1 to move along a wall of the cam guide 22.2. This in turn leads to said axial displacement of the rotary shaft 22 and thus to the two latching elements 22.1, 5.3 detaching from one another, which then has the result that the adjusting wheel 17 can be rotated and thus the carriage 13 can be adjusted.

Since displacement of the carriage 13 on the abutment 5 becomes more and more difficult with increasing compression of the spring 4, a locking mechanism preventing rotation of the rotary shaft 22 when the chair is loaded is also particularly preferably provided. This is particularly preferably formed from a non-rotatable, but preferably axially displaceable, ratchet wheel 26 connected to the rotary shaft 22 and a slidably mounted on the abutment 5, spring-loaded and cooperating with the ratchet wheel 26 blocking element 27 (if, as in the illustrated embodiment, the blocking element 27 is designed wide enough, it is not necessary for the ratchet wheel 26 to be configured to be axially displaceable on the rotary shaft 22). Provision is also preferably made for the blocking element 27 to interact with the chair base 1 when the chair is not loaded and to release the locking wheel 26 and to block the locking wheel 26 when the chair is loaded. In addition, as in particular from the Figures 13 and 14 As can be seen, it is particularly preferred that the ratchet wheel 26 has sawtooth teeth, again in such a way that any movement of the carriage 13 on the bearing surface 5.1 in the direction of the pivot bearing 15 is or is reliably prevented.

Since the adjusting wheel 17 is preferably designed to be firmly connected to the rotary shaft 22 , it is also preferably provided that the adjusting element 6 is designed to be slidably mounted at least in the area of the adjusting wheel 17 parallel to the axis of rotation of the abutment 5 .

Finally, to ensure good guidance of the actuating element 6 , guide elements are preferably provided on both sides of the actuating wheel 17 and each act on the actuating element 6 from the outside 28, preferably in the form of screw bolts.

Reference List

1

chair base

2

Seat

3

backrest

4

Feather

5

abutment

5.1

storage area

5.2

first gearing

5.3

second locking element

6

actuator

7

fastener

8th

longitudinal guide

9

backrest support

10

seat carrier

11

swivel joint

12

pivot bearing

13

Sleds

14

telescopic guide

15

pivot bearing

16

groove

17

wheel

18

secondary spring

19

telescopic guide

20

Foot

21

power transmission device

21.1

second serrations

22

rotary shaft

22.1

first locking element

22.2

cornering

23

spring element

24

control rod

24.1

cones

25

guide element

26

ratchet wheel

27

blocking element

28

guide element

Claims (9)

1. A chair comprising a chair base (1) on which a seat (2) and a backrest (3) connected to the seat (2) via a synchronizing mechanism are movably mounted, wherein a spring (4), that presses the seat (2) into a base position of the chair and a counter-bearing (5) mounted rotatably on the chair base (1), are provided, wherein the counter-bearing (5) is configured to cooperate on the one hand with a connecting element (7) connected to a front edge of the seat (2) and on the other with one end of the spring (4), wherein the connecting element (7) cooperating with the counter-bearing (5) is configured to be guided in a longitudinal guide (8) and is arranged in the base position of the seat in a highest position of the longitudinal guide (8), wherein a pivot bearing (15) is provided for fastening the counter-bearing (5) on the chair base (1),
   characterized in that
   the pivot bearing (15) is arranged at one end of the counter-bearing (5) and the connecting element (7) is configured to act at the other end of the counter-bearing (5).
2. The chair according to claim 1,
   characterized in that
   the longitudinal guide (8) for the connecting element (7) in the upright position of the chair is configured to slope downwards when viewed from a front edge of the seat (2) in the direction of the backrest (3).
3. The chair according to claim 1 or 2,
   characterized in that
   two seat supports (10) connected to one another via the connecting element (7) are provided, wherein the chair base (1) is arranged between the two seat supports (10) and the connecting element (7) is displaceably mounted on the chair base (1).
4. The chair according to one of claims 1 to 3,
   characterized in that
   a backrest support (9) pivotable about a horizontal axis is mounted on the chair base (1).
5. The chair according to claim 3 and 4,
   characterized in that
   the backrest support (9) and the two seat supports (10) are connected to one another via two swivel joints (11) which can be moved independently of the chair base (1) and have horizontal axes.
6. The chair according to one of claims 1 to 5,
   characterized in that
   the connecting element (7) operatively connected to the seat (2) via the seat supports (10) is configured to be operatively connected to the counter-bearing (5) for the spring (4).
7. The chair according to claim 6,
   characterized in that
   a force transmission device (21) is arranged between the connecting element (7) and the counter-bearing (5).
8. The chair according to claim 7,
   characterized in that
   the counter-bearing (5) has a first toothed structure (5.2) on the force transmission device side, that the force transmission device (21) has a second toothed structure (21.1) on the counter-bearing side and that the two toothed structures (5.2, 21.1) are each convexly curved towards one another and are configured to engage with one another.
9. The chair according to claim 7 or 8,
   characterized in that
   the counter-bearing (5) is configured to be arcuate and the toothed structure (5.2) on the power transmission device side is arranged on a convex outer side and the bearing surface (5.1) for the spring (4) is arranged on a concave inner side of the counter-bearing (5).

Images