DE102018115924A1 - chair - Google Patents

Abstract

The invention relates to a chair comprising a chair base (1) on which a seat and a backrest connected to the seat via a synchronous mechanism are movably mounted, with a spring (4) pressing the seat into a basic position of the chair and a rotatable one on the seat Chair base (1) mounted abutment (5) are provided, the abutment (5) being designed to cooperate with the seat and 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 is. According to the invention, a control element (6) which transmits only tensile forces is provided for fixing the position of one end of the spring (4) on the bearing surface (5.1).

Description

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

A chair of the type mentioned is from the patent document DE 10 2007 059 985 B3 known. This chair consists of a chair base on which a seat and a backrest which is connected to the seat via a synchronous mechanism are movably mounted, 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 is designed to cooperate with the seat and has a bearing surface on which one end of the spring can be positioned in different positions in order to set an effective spring force. In this solution, the bearing surface of the abutment has so-called locking recesses, in which a locking pin engages. To set the desired effective spring force, the locking pin is moved accordingly with the help of two sliding bearings and a complex planetary gear.

The invention has for its object to improve a chair of the type mentioned. In particular, a chair should be created with a mechanically less complex mechanism for adjusting the effective spring force.

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

According to the invention, therefore, an actuating element that transmits only tensile forces is provided for fixing the position of one end of the spring on the bearing surface.

In other words, the solution according to the invention is thus characterized in that the position is determined with the aid of an actuating element with which the spring or one end is pulled in order to set the respectively desired effective spring force. The actuating element, which will be explained in more detail below, is particularly preferably designed as a chain or rope, that is to say as an element which is referred to in technical mechanics as being limp, since it is in particular not suitable for transmitting compressive forces or moments. The use of such an actuating element brings with it the possibility of providing a comparatively simple actuating mechanism for actuating the actuating element, which is also explained in more detail below.

Other advantageous developments of the chair according to the invention result from the dependent patent claims.

For the sake of completeness, the solution according to the patent document is still mentioned EP 1 440 632 B1 pointed out, but usually there is a problem that there is a jerk when the chair is loaded, namely when the tooth of the spring guide snaps into the locking recess of the rack.

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

• 1 perspektivisch im Schnitt die Synchronmechanik in unbelasteter Stellung mit einer „weich“ wirkend eingestellten Feder;
• 2 perspektivisch im Schnitt die Synchronmechanik gemäß 1 in belasteter Stellung mit der „weich“ wirkend eingestellten Feder;
• 3 perspektivisch die Synchronmechanik gemäß 1 in unbelasteter Stellung mit einer „hart“ wirkend eingestellten Feder;
• 4 perspektivisch im Schnitt die Synchronmechanik gemäß 1 in belasteter Stellung mit der „hart“ wirkend eingestellten Feder;
• 5 der erfindungsgemäße Stuhl, bei dem sich die in den 1 bis 4 dargestellte Synchronmechanik unterhalb des Sitzes bzw. der Sitzfläche befindet;
• 6 perspektivisch im Schnitt die Synchronmechanik gemäß 3 in unbelasteter Stellung mit einer „hart“ wirkend eingestellten Feder;
• 7 in Seitenansicht einen Teil der Synchronmechanik gemäß 1 in unbelasteter Stellung mit einer „weich“ wirkend eingestellten Feder;
• 8 in Seitenansicht einen Teil der Synchronmechanik gemäß 1 in belasteter Stellung mit einer „weich“ wirkend eingestellten Feder;
• 9 als perspektivische Explosionsdarstellung das Widerlager gemäß 1 insbesondere mit dem Stellelement (schematisch) und dem Stellrad;
• 10 perspektivisch einen Teil der Synchronmechanik gemäß 1, insbesondere des Widerlagers in unbelasteter Stellung (in dieser Position kann die Federkraft eingestellt werden) mit einer „weich“ wirkend eingestellten Feder;
• 11 perspektivisch und im Schnitt einen Teil der Synchronmechanik gemäß 1, insbesondere die Stellstange mit Zapfen und die Drehwelle mit Kurvenführung in belasteter Stellung;
• 12 perspektivisch und im Schnitt einen Teil der Synchronmechanik gemäß 1, insbesondere die Stellstange mit Zapfen und die Drehwelle mit Kurvenführung in unbelasteter Stellung;
• 13 perspektivisch und im Schnitt einen Teil der Synchronmechanik gemäß 1, insbesondere den Rastmechanismus bei unbelastetem Stuhl und damit in Öffnungsstellung; und
• 14 perspektivisch und im Schnitt einen Teil der Synchronmechanik gemäß 2, insbesondere den Rastmechanismus bei belastetem Stuhl und damit in Blockadestellung.

It shows

• 1 in perspective, the synchronous mechanism in the unloaded position with a “soft” spring;
• 2 in perspective the synchronous mechanism according to 1 in the loaded position with the "soft"spring;
• 3 perspective the synchronous mechanism according 1 in the unloaded position with a "hard" acting spring;
• 4 in perspective the synchronous mechanism according to 1 in the loaded position with the "hard" acting spring;
• 5 the chair of the invention, in which the 1 to 4 shown synchronous mechanism is located below the seat or the seat;
• 6 in perspective the synchronous mechanism according to 3 in the unloaded position with a "hard" acting spring;
• 7 part view of the synchronous mechanism according to 1 in the unloaded position with a “soft” spring;
• 8th part view of the synchronous mechanism according to 1 in a loaded position with a "soft"spring;
• 9 as an exploded perspective view of the abutment 1 in particular with the control element (schematic) and the control wheel;
• 10 perspective part of the synchronous mechanism according 1 , in particular the abutment in the unloaded position (in this position the spring force can be adjusted) with a "soft" acting spring;
• 11 perspective and in section a part of the synchronous mechanism according to 1 , in particular the control rod with pin and the rotary shaft with curve guidance in the loaded position;
• 12 perspective and in section a part of the synchronous mechanism according to 1 , in particular the adjusting rod with pin and the rotary shaft with curve guidance in the unloaded position;
• 13 perspective and in section a part of the synchronous mechanism according to 1 , in particular the locking mechanism when the chair is unloaded and thus in the open position; and
• 14 perspective and in section a part of the synchronous mechanism according to 2 , in particular the locking mechanism when the chair is loaded and thus in the blocked position.

The one in the 1 to 14 shown chair initially consists in a known manner, preferably with one foot 20 provided chair base 1 on which a seat 2 and one via a synchronous mechanism with the seat 2 connected backrest 3 are movably mounted, one of which is the seat 2 spring pushing into a basic position of the chair 4 and a swivel on the chair base 1 stored abutment 5 are provided, the abutment 5 with the seat 2 is designed to cooperate and a bearing surface 5.1 has at one end of the spring 4 can be positioned in different positions to set an effective spring force.

As can be seen from the figures, two are particularly preferred, via a connecting element 7 interconnected seat supports 10 provided the chair base 1 between the two seat supports 10 arranged and the connecting element 7 slidable on the chair base 1 is stored.

Furthermore, it is preferably provided that on the chair base 1 a backrest support that can be swiveled around a horizontal axis 9 is stored.

Furthermore, the backrest support is preferred 9 and the two seat supports 10 over two, regardless of the chair base 1 movable swivel joints with horizontal axes 11 connected with each other.

In addition, it is preferably provided that the seat 2 over the seat support 10 operative connection element 7 with the abutment 5 for the spring 4 is operatively connected.

It is now essential for this chair that an adjusting element that only transmits tensile forces 6 to determine the position of one end of the spring 4 on the storage area 5.1 is provided. As already explained at the beginning, this requirement enables the creation of a very precisely adjustable chair.

Considered in more detail, it is particularly preferred that the actuating element 6 optionally as a chain (see 1 to 14 ) or rope (not shown separately).

For guiding the control element 6 is particularly preferred on the abutment 5 a groove 16 (see in particular 9 ) intended. This is wider than the control element 6 trained so this in the groove 16 is mounted transversely.

It is also particularly preferred on the abutment 5 an adjusting wheel having an axis of rotation running horizontally in the upright position (ie in the use position) of the chair 17 for adjusting the control element 6 intended. It is also particularly preferred that the adjusting wheel 17 if necessary, rotatable on the abutment 5 mounted rotary shaft 22 is arranged.

As can be seen from the figures, it is further provided that the abutment 5 on the one hand with that with a front edge of the seat 2 connected connecting element 7 and on the other hand with one end of the spring 4 is designed to work together. In this case, it is also particularly preferred that that with the abutment 5 cooperating connecting element 7 in a longitudinal guide 8th guided and in the basic position of the seat in a highest position of the longitudinal guide 8th is arranged.

Considered in more detail, it is particularly preferred that the longitudinal guide 8th for the connecting element 7 in the upright position of the chair from a front edge of the seat 2 out towards the backrest 3 seen sloping.

Regarding the longitudinal guidance 8th is also particularly preferably provided that this from the front edge of the seat in the upright position of the chair 2 from the horizontal with an angle of around 10 ° to the backrest 3 is sloping down. It is also preferably provided that the longitudinal guide 8th at both ends, matching the connecting element designed as a cylindrical rod 7 , is semicircular.

Regarding the spring mentioned at the beginning 4 , which are particularly preferably optionally designed as a helical compression spring and / or a telescopic guide in the interior thereof 14 is arranged, it is also particularly preferred that one end of the spring 4 with the abutment 5 and another end of the spring 4 with one at the chair base 1 provided pivot bearing 12 is connected. Here is the feather 4 , a little closer, around a horizontal axis around the pivot bearing 12 rotatably mounted.

Furthermore, as can be seen from the figures, it is particularly preferred between the connecting element 7 and the chair base 1 a second spring, which is preferably also designed as a helical compression spring, for specifying a defined preload 18 arranged, preferably a telescopic guide in the interior 19 is arranged. This ultimately makes it advantageously possible to use the adjustable spring 4 and with it the abutment 5 size smaller. In particular, this creates a basic tension 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.

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

It is also preferably provided that the pivot bearing 15 at one end of the abutment 5 arranged and the connecting element 7 at the other end of the abutment 5 is designed to be attacking.

Furthermore, it is particularly preferably provided that the above-mentioned bearing surface 5.1 of the abutment 5 that of the above groove 16 is preferably formed into two elongated partial surfaces, for the spring 4 is concavely curved. It is also preferably provided that the spring 4 at its abutment end with one opposite the bearing surface 5.1 sliding carriage 13 on the storage area 5.1 is designed to fit. For this purpose, it is also particularly preferred that the carriage 13 , which is preferably fixed to the actuator 6 is formed connected, on the abutment side to match the bearing surface 5.1 is convex.

The figures show that the abutment is twisted 5 around its pivot bearing 15 a compression of the spring 4 causes. In addition, it is also particularly preferably provided 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 less compression of the spring 4 as a position of the spring 4 distanced to the pivot bearing 15 is designed to effect.

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

To transfer the from the seat 2 coming and on the spring 4 acting forces is still between the connecting element 7 and the abutment 5 a power transmission device 21 arranged. This serves, as can be seen in particular from the 7 and 8th and the following description reveals that the introduction of the force from the connecting element 7 to the abutment 5 due to the toothing of the power transmission device to be explained 21 always parallel to the longitudinal guide 8th and is therefore practically lossless.

Considered in more detail, it is particularly preferred that the abutment 5 a first toothing on the power transmission device side 5.2 with preferably at least three teeth, that the power transmission device 21 a second set of teeth on the abutment side 21.1 with preferably at least four teeth and that the two teeth 5.2 . 21.1 are each convex to each other and are at least partially in engagement with each other.

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

Furthermore, as can also be seen from the figures, it is preferably provided that the power transmission device 21 rotatable on the connecting element about an axis oriented horizontally in the upright position of the chair 7 is trained. Considered in more detail, it is particularly preferred that the power transmission device 21 a cylindrical, the connecting element 7 , in particular the aforementioned rod, has a surrounding through opening.

It is also preferably provided that the power transmission device 21 two, between them a free space for the control element 6 parts with a second set of teeth 21.1 is formed.

As the comparison of the figures shows, it is also particularly preferred that the connecting element be displaced 7 a Displacement and rotation of the power transmission device 21 is designed to effect. In addition, it is provided that the power transmission device is displaced and rotated 21 a rotation of the abutment 5 around its pivot bearing 15 is designed to effect.

Furthermore, it is particularly preferably provided that the actuating element 6 , which is preferably self-contained, around the abutment 5 led around or this and preferably also the adjusting wheel to be explained below 17 is encompassing.

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

For operating the setting wheel 17 an actuating mechanism is also particularly preferably provided, in particular for the above-mentioned rotary shaft 22 heard.

With regard to this, it is also preferably provided that it is displaceable between two axial positions on the abutment 5 is trained.

Furthermore, a spring element is particularly preferred 23 to move the rotating shaft 22 provided in a first axial position. It is also particularly preferred on the rotating shaft 22 a first locking element 22.1 provided that in the first axial position with one on the abutment 5 provided, second locking element 5.3 is designed to work together. The two locking elements 22.1 . 5.3 particularly preferably each designed as a crown gear toothing (see also https://de.wikipedia.org/w/index.php?title=Kronenrad&oldid=174349785). In addition, as in particular from the 9 and 10 can be seen, particularly preferably provided that the crown gear toothing is designed as a saw tooth toothing, in such a way that in any case a movement of the carriage 13 on the storage area 5.1 towards the pivot bearing 15 is safely prevented.

Also preferred is one with the rotating shaft 22 active control rod 24 intended. In addition, to cause an axial displacement of the rotating shaft 22 In a second axial position, an adjusting mechanism is preferably provided. This is preferably made of one on the adjusting rod 24 provided cones 24.1 and one on the rotating shaft 22 provided with the tenon 24.1 interacting curve guidance 22.2 educated. In addition, the rotary shaft 22 preferably one of a part of the control rod 24 penetrated through hole. Furthermore, the control rod 24 preferably rotatable, but axially immovable on the abutment 5 stored.

As can be seen from the figures, this causes a rotary movement on the adjusting rod 24 that the cone 24.1 along a wall of the curve 22.2 emotional. This in turn leads to the said axial displacement of the rotating shaft 22 and so that the two locking elements 22.1 . 5.3 separate from each other, which then has the consequence that the adjusting wheel 17 rotated and thus the sled 13 can be adjusted.

Because a shift in the sled 13 on the abutment 5 with increasing compression of the spring 4 is becoming increasingly heavy, a rotation of the rotary shaft when the chair is loaded is also particularly preferred 22 preventing locking mechanism provided. This is particularly preferably made of a non-rotatable, but preferably axially displaceable with the rotary shaft 22 connected ratchet wheel 26 and one slidable on the abutment 5 stored, spring-loaded and with the ratchet wheel 26 interacting blocking element 27 formed (if, as in the illustrated embodiment, the blocking element 27 is wide enough, it can be dispensed with that the ratchet wheel 26 axially displaceable on the rotating shaft 22 is trained). It is also preferably provided that the blocking element 27 when the chair is unloaded with the chair base 1 interacting and the ratchet wheel 26 releasing the ratchet wheel when the chair is loaded 26 is designed to be blocking. In addition, as in particular from the 13 and 14 can be seen, particularly preferably provided that the ratchet wheel 26 has a sawtooth toothing, again in such a way that in any case a movement of the carriage 13 on the storage area 5.1 towards the pivot bearing 15 is safely prevented.

Because the thumbwheel 17 preferably fixed to the rotating shaft 22 is connected, it is also preferably provided that the actuating element 6 at least in the area of the adjusting wheel 17 parallel to the axis of rotation of the abutment 5 is slidably mounted.

Finally, are preferably to ensure good control of the actuator 6 on both sides of the adjusting wheel 17 and in each case from the outside on the control element 6 acting guide elements 28 , preferably in the form of bolts.

LIST OF REFERENCE NUMBERS

1

chair base

2

Seat

3

backrest

4

feather

5

abutment

5.1

storage area

5.2

first interlocking

5.3

second locking element

6

actuator

7

connecting element

8th

longitudinal guide

9

Backrest support

10

seat support

11

swivel

12

pivot bearing

13

carriage

14

telescopic guide

15

pivot bearing

16

groove

17

thumbwheel

18

second spring

19

telescopic guide

20

foot

21

Power transmission device

21.1

second toothing

22

rotary shaft

22.1

first locking element

22.2

curved guide

23

spring element

24

control rod

24.1

spigot

25

guide element

26

ratchet wheel

27

blocking element

28

guide element

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102007059985 B3 [0002]
• EP 1440632 B1 [0008]

Claims (10)

Chair, comprising a chair base (1) on which a seat (2) and a backrest (3) connected to the seat (2) via a synchronous mechanism are movably mounted, a spring pressing the seat (2) into a basic position of the chair (4) and an abutment (5) rotatably mounted on the chair base (1) are provided, the abutment (5) being designed to interact with the seat (2) and having a bearing surface (5.1) on which one end of the spring ( 4) can be positioned in different positions to set an effective spring force, characterized in that an adjusting element (6) which transmits only tensile forces is provided for fixing the position of one end of the spring (4) on the bearing surface (5.1). Chair after Claim 1 , characterized in that the adjusting element (6) is optionally designed as a chain or rope. Chair after Claim 1 or 2 , characterized in that a groove (16) for guiding the actuating element (6) is provided on the abutment (5). Chair after one of the Claims 1 to 3 , characterized in that an adjusting wheel (17) is provided on the abutment (5) with an axis of rotation extending horizontally in the upright position of the chair for adjusting the adjusting element (6). Chair after Claim 4 , characterized in that the adjusting wheel (17) is arranged on a rotary shaft (22) which is rotatably mounted on the abutment (5) if necessary. Chair after one of the Claims 1 to 5 , characterized in that two seat supports (10) connected to one another via a connecting element (7) are provided, the chair base (1) being arranged between the two seat supports (10) and the connecting element (7) being displaceably mounted on the chair base (1) is. Chair after Claim 6 , wherein a pivot bearing (15) is provided for fastening the abutment (5) to the chair base (1), characterized in that the pivot bearing (15) is arranged at one end of the abutment (5) and the connecting element (7) at the other end of the abutment (5) is designed to attack. Chair after Claim 6 or 7 , characterized in that a force transmission device (21) is arranged between the connecting element (7) and the abutment (5). Chair after Claim 8 , characterized in that the abutment (5) has a first toothing (5.2) on the power transmission device side, that the power transmission device (21) has a second toothing (21.1) on the abutment side and that the two toothings (5.2, 21.1) are each convexly curved and at least with one another are partially formed in engagement. Chair after Claim 9 , characterized in that the abutment (5) is arcuate and the toothing (5.2) on the power transmission device side 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).

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