CN112384106B

CN112384106B - Chair

Info

Publication number: CN112384106B
Application number: CN201980044670.4A
Authority: CN
Inventors: T·米歇尔森
Original assignee: Konich And Neulat Ag
Current assignee: Konich And Neulat Ag
Priority date: 2018-07-02
Filing date: 2019-06-28
Publication date: 2024-05-28
Anticipated expiration: 2039-06-28
Also published as: PL3817628T3; CN112384106A; WO2020007411A1; EP3817628B1; EP3817628C0; DE102018115925A1; EP3817628A1

Abstract

The invention relates to a chair comprising a chair base (1) on which a seat and a backrest connected to the seat by a synchronization mechanism are movably supported, wherein a spring (4) is provided which presses the seat into an initial position of the chair and a support (5) which is rotatably supported on the chair base (1), wherein the support (5) is designed to interact with a connecting element (7) connected to the front edge of the seat on the one hand and with the end of the spring (4) on the other hand. According to the invention, the connecting element (7) interacting with the support (5) is designed to be guided in a longitudinal guide (8) and is arranged in the uppermost position of the longitudinal guide (8) in the initial position of the seat.

Description

Chair

Technical Field

The present invention relates to a chair.

Background

A chair of the type mentioned at the outset is known from DE 10 2007 059 985 B3. The chair comprises a chair base, on which a seat and a backrest connected to the seat by a synchronization mechanism are movably supported, wherein a spring is provided which presses the seat into an initial position of the chair, and a support which is rotatably supported on the chair base, wherein the support is configured to interact with a connecting element connected to a front edge of the seat on the one hand and with an end of the spring on the other hand. In this case, the spring is furthermore designed to be positionable on the support in different positions in order to adjust the spring force acting. In this solution, the front edge of the seat and the support are furthermore arranged on a front seat guide, which is itself mounted on the chair base in a pivotable manner.

Disclosure of Invention

The object of the invention is to improve a chair of the type mentioned at the outset. In particular, a chair should be provided in which, unlike the prior art described above, the front edge of the chair is not raised when the backrest is loaded.

This object is achieved by a chair of the type mentioned at the outset by the features which are implemented in the characterizing part of the solution according to the invention.

According to the invention, the connecting element interacting with the support is configured to be guided in the longitudinal guide and arranged in the uppermost position of the longitudinal guide in the initial position of the seat.

In other words, the solution according to the invention is characterized in that the seat front edge does not rise when the chair is loaded due to the longitudinal guide and despite the adjustability of the spring force achieved at the same time by the rotatably mounted support. In this case, it is also more particularly described that the longitudinal guide in the upright position of the chair (the connecting element is then in each position in the highest position of the longitudinal guide) is either extended completely horizontally or that the longitudinal guide in the initial position is formed so as to be inclined gently downward from the highest position relative to the horizontal, so that the seat front edge drops maximally under the load of the chair, but is not raised at all.

In addition, it is particularly preferred to provide, as will be explained in more detail below, for the support to have teeth on the longitudinal guide side and for an intermediate connection, also referred to as a force transmission device, to be arranged between the longitudinal guide and the teeth for transmitting force between the spring and the seat, which intermediate connection is likewise engaged on the teeth side and can be mounted in a pivotable manner relative to the longitudinal guide.

Other advantageous further embodiments result from the solution according to the invention.

Drawings

The following drawing according to a preferred embodiment describes in detail a chair according to the invention comprising an advantageous further solution according to the invention.

In the accompanying drawings:

fig. 1 shows a perspective view of a synchronization mechanism with a "soft" actively adjusted spring in the unloaded state;

fig. 2 shows the synchronization mechanism according to fig. 1 in a sectional view in perspective with a spring that is adjusted in a "soft" manner in the loaded position;

Fig. 3 shows the synchronization mechanism according to fig. 1 in perspective with a spring adjusted in a "hard" manner in the unloaded state;

fig. 4 shows the synchronization mechanism according to fig. 1 in a sectional view in perspective with a spring adjusted "hard" in the loaded position;

fig. 5 shows a chair according to the invention, wherein the synchronization mechanism shown in fig. 1 to 4 is located below the seat or seat surface;

fig. 6 shows the synchronization mechanism according to fig. 3 in a sectional view in perspective with a spring adjusted "hard" in the unloaded state;

Fig. 7 shows a part of the synchronization mechanism according to fig. 1 with a "soft" actively adjusted spring in the unloaded position in a side view;

fig. 8 shows a part of the synchronization mechanism according to fig. 1 with a "soft" actively adjusted spring in the loaded position in a side view;

Fig. 9 shows the support according to fig. 1 as a perspective exploded view, in particular with an adjusting element (schematic) and an adjusting wheel;

Fig. 10 shows a part of the synchronization mechanism according to fig. 1, in particular a carrier, with a "soft" actively adjusted spring in the unloaded state (in which the spring force can be adjusted);

Fig. 11 shows a part of the synchronization mechanism according to fig. 1, in particular an adjusting lever with a bolt and a rotary shaft with a cam guide, in perspective and in a sectional view in the loaded position;

fig. 12 shows a part of the synchronization mechanism according to fig. 1, in particular an adjusting lever with a bolt and a rotary shaft with a cam guide, in perspective and in a sectional view in the unloaded position;

Fig. 13 shows a part of the synchronization mechanism according to fig. 1, in particular a locking mechanism, in perspective and in section when the chair is not loaded and thus in the open position; and

Fig. 14 shows a part of the synchronization mechanism according to fig. 2, in particular the locking mechanism, in perspective and in section when the chair is loaded and thus in the locked position.

Detailed Description

The chair shown in fig. 1 to 14 comprises a chair base 1, on which the seat 2 and the backrest 3, which is connected to the seat 2 by means of a synchronization mechanism, are mounted in a movable manner, which is preferably provided with legs 20, wherein a spring 4 is provided which presses the seat 2 into the initial position of the chair and a support 5 which is mounted rotatably on the chair base 1, wherein the support 5 is configured to interact with a connecting element 7 which is connected to the front edge of the seat 2 on the one hand and with the end of the spring 4 on the other hand.

As can be seen from the figures, particularly preferably two seat carriers 10 are provided here, which are connected to one another by means of a connecting element 7, wherein the chair base 1 is arranged between the two seat carriers 10 and the connecting element 7 is mounted on the chair base 1 in a movable manner.

Furthermore, a backrest carrier 9 is preferably provided, which can be pivoted about a horizontal axis, and is supported on the chair base 1.

Furthermore, the backrest carrier 9 and the two seat carriers 10 are connected to one another here preferably by two rotary joints 11 with a horizontal axis, which can be moved independently of the chair base 1.

Furthermore, it is preferably provided that the connecting element 7, which is operatively connected to the seat 2 via the seat carrier 10, is designed to be operatively connected to the support 5 for the spring 4.

It is important for the chair in this case that the connecting element 7 interacting with the support 5 is configured to be guided in the longitudinal guide 8 and to be arranged in the uppermost position of the longitudinal guide 8 in the initial position of the seat. As already mentioned at the outset, the condition is to provide a chair in which the front edge does not actually drop even under load.

More specifically, it is particularly preferred to provide that the longitudinal guide 8 for the connecting element 7 is configured obliquely downward, viewed in the direction of the backrest 3 from the front edge of the seat 2 when the chair is in use.

As can be seen from the figures, it is furthermore provided that the support 5 has a support surface 5.1 on which the ends of the springs 4 can be positioned in different positions in order to adjust the spring force acting. In this case, it is furthermore particularly preferred to provide for the positioning of the end of the spring 4 on the support surface 5.1 to be provided with a control element 6 which transmits only tensile forces.

More particularly, it is seen that it is particularly preferred to provide that the adjusting element 6 is optionally configured as a chain (see fig. 1 to 14) or as a rope (not additionally shown).

In order to guide the adjusting element 6, it is particularly preferred here to provide a groove 16 in the support 5 (see, for this purpose, in particular, fig. 9). The slot is configured to be wider than the adjusting element 6, so that said adjusting element is supported in the slot 16 in a laterally movable manner.

Furthermore, it is particularly preferred to provide an adjustment wheel 17 on the support 5 with a rotation axis extending horizontally when the chair is in use for adjusting the adjustment element 6. In this case, it is also particularly preferred to provide that the adjusting wheel 17 is arranged on a rotary shaft 22 which is rotatably supported on the support 5 if required.

In addition, a longitudinal guide 8 is particularly preferably provided, which in the upright position of the chair, starting from the front edge of the seat 2, is configured at an angle of approximately 10 ° downward toward the backrest 3 with respect to the horizontal. Furthermore, it is preferably provided that the longitudinal guide 8 is embodied semi-circular at its two ends which are matched to the connecting element 7 of the rod which is embodied as a cylinder.

As regards the spring 4 mentioned at the outset, it is particularly preferably optionally configured as a compression spring and/or a telescopic guide 14 is arranged in the interior of the spring, and it is furthermore particularly preferably provided that one end of the spring 4 is configured to be connected to the support 5 and the other end of the spring 4 is connected to a rotary support 12 arranged on the chair base 1. More specifically, it is seen that the spring 4 is here configured to be rotatably supported about a horizontal axis about a rotational support 12.

As can also be seen from the drawing, a second spring 18, which is preferably likewise embodied as a compression spring, is arranged between the connecting element 7 and the chair base 1, in particular preferably for the purpose of predetermining a defined prestress, in the interior of which second spring a telescopic guide 19 is preferably likewise arranged. This finally advantageously makes it possible to design the adjustable spring 4 and thus the support 5 to be of smaller dimensions. In particular, however, a basic stress is thereby created, which, despite the seat load, still holds the chair in the front position, so that the spring force can be changed, rather than the adjustment (see locking wheel and locking element).

Furthermore, as can be seen from the figures, it is particularly preferred that the longitudinal axes of the spring 4 and the second spring 18 along which the compensation of said springs is effected lie in planes parallel to each other.

It is more particularly seen that the swivel bearing 15 is particularly preferably provided on the chair base 1 for the purpose of fixing the aforementioned support 5 (see, for this purpose, in particular, fig. 10). Furthermore, the swivel bearing 15 is arranged on the end of the support 5 facing away from the seat, said swivel bearing preferably having a horizontal swivel axis in the upright position of the chair.

It is furthermore preferably provided that the swivel bearing 15 is configured to be arranged on one end of the support 5 and that the connecting element 7 is configured to be fitted on the other end of the support 5.

It is furthermore particularly preferred to provide that the aforementioned support surface 5.1 of the support 5 is concavely curved toward the spring 4, which is formed as two elongated partial surfaces preferably divided by the aforementioned groove 16. Furthermore, it is preferably provided that the spring 4 is designed to rest on the support-side end thereof on the support surface 5.1 by means of a slide 13 that can be moved relative to the support surface 5.1. For this purpose, it is also particularly preferred that the slide 13, which is preferably designed in a fixed connection to the adjusting element 6, is designed to curve convexly on the support side in accordance with the support surface 5.1.

As can be seen from the drawing, the rotation of the support 5 about its swivel bearing 15 causes the compression spring 4. It is furthermore particularly preferred that the position of the spring 4 close to the swivel bearing 15 of the support 5 causes a smaller compression of the spring 4 than the position of the spring 4 away from the swivel bearing 15 during a predefined displacement of the connecting element 7.

In addition, it is particularly preferred that the bearing surface 5.1 is provided with a stop for the spring 4 or the slide 13, respectively, when viewed in both adjustment directions of the spring 4.

In order to transmit the force from the seat 2 and acting on the spring 4, a force transmission device 21 is furthermore arranged between the connecting element 7 and the support 5. As is evident in particular from fig. 7 and 8 and the description below, the force transmission device serves to achieve a force transmission from the connecting element 7 into the support 5, which is always parallel to the longitudinal guide 8, and thus virtually without loss, by the teeth of the force transmission device 21, which are described further below.

It is more particularly preferred here to provide that the carrier 5 has a first tooth 5.2 on the force transmission device side with preferably at least three teeth, that the force transmission device 21 has a second tooth 21.1 on the carrier side with preferably at least four teeth, and that the two teeth 5.2, 21.1 are each configured to curve convexly toward one another and at least partially engage one another.

Furthermore, it is particularly preferred that the carrier 5 is configured in an arc-shaped manner, in particular in the shape of an arc, and that the tooth 5.2 on the force transmission device side is arranged on the convex outer side, and that the support surface 5.1 for the spring 4 is arranged on the concave inner side of the carrier 5.

Furthermore, as can also be seen from the figures, the force transmission means 21 are preferably provided so as to be rotatably supported on the connecting element 7 about an axis oriented horizontally in the upright position of the chair. It is also more particularly seen that it is particularly preferred here to provide the force transmission device 21 with a cylindrical shape surrounding the connecting element 7, in particular a so-called rod through-hole.

Furthermore, it is preferably provided that the force transmission device 21 is formed from two parts each having a second toothing 21.1, between which a free space 6 for the adjusting element is present.

As is shown with reference to the figures, it is furthermore particularly preferred that the movement of the connecting element 7 is designed to cause a movement and a rotation of the force transmission means 21. Furthermore, provision is made for the displacement and rotation of the force transmission means 21 to be designed to cause the support 5 to rotate about its swivel bearing 15.

Furthermore, it is particularly preferred to provide that the adjusting element 6, which is preferably closed on itself, is designed to be guided around the support 5 or that it is preferably also designed to surround an adjusting wheel 17, which is described further below.

As can be seen from the drawing, the adjusting wheel 17 is particularly preferably embodied as a sprocket wheel (see also https:// de. Wikipedia. Org/w/index. Phptile= KETTENRAD & oldid = 177 726929 for this purpose). Alternatively (not shown in addition), the adjusting element 6 is designed as a rope, in particular a wire rope, and the adjusting wheel 17 has guide grooves which cooperate with the rope and make slipping of the rope impossible (furthermore, for example, a cylinder or the like can be placed on the rope, which cylinder prevents slipping on the adjusting wheel 17). In both solutions, it is preferably provided that the adjusting wheel 17 has a rotation axis extending parallel to the rotation bearing 15 of the support 5.

For actuating the adjusting wheel 17, an adjusting mechanism is furthermore particularly preferably provided, to which the above-described rotary shaft 22 in particular belongs.

It is furthermore preferably provided that the rotary shaft is mounted on the support 5 so as to be movable between two axial positions.

Furthermore, a spring element 23 is particularly preferably provided for displacing the rotary shaft 22 into the first axial position. Furthermore, it is particularly preferred to provide a first locking element 22.1 on the rotary shaft 22, which is configured to interact with a second locking element 5.3 provided on the support 5 in a first axial position. In this case, the two locking elements 22.1,5.3 are particularly preferably embodied as crown gear teeth (see also https:// de. Wikipedia. Org/w/index. Phptile= Kronenrad & oldid = 174349785 for this purpose). As can be seen in particular from fig. 9 and 10, it is furthermore particularly preferred to provide that the crown gear teeth are configured as saw teeth, in particular in any case reliably preventing the slide 13 from moving on the support surface 5.1 in the direction of the pivot bearing 15.

Furthermore, an adjusting lever 24 is preferably provided which is operatively connected to the rotary shaft 22. Furthermore, an adjustment mechanism is preferably provided for the axial displacement of the rotary shaft 22 into the second axial position. The adjusting mechanism is preferably formed by a pin 24.1 provided on the adjusting lever 24 and a cam guide 22.2 provided on the rotary shaft 22, which interacts with the pin 24.1. Further, the rotation shaft 22 preferably has a through hole penetrated by a portion of the adjustment lever 24. Furthermore, the adjusting lever 24 is preferably mounted on the support 5 in a rotatable, but axially immovable manner.

As can be seen from the drawing, a rotational movement of the adjusting lever 24 is thereby achieved, the bolt 24.1 being moved along the wall of the curved guide 22.2. This in turn causes the axial displacement of the rotary shaft 22 and thus the two locking elements 22.1,5.3 to be released from one another, which in turn causes the adjusting wheel 17 to be able to rotate and thus adjust the slide 13.

Since the displacement of the slide 13 on the support 5 is increasingly difficult with increasing compression of the spring 4, a locking mechanism is furthermore particularly preferably provided which prevents the rotation of the rotary shaft 22 when the chair is loaded. The locking mechanism is particularly preferably formed by a locking wheel 26 which is connected to the rotary shaft 22 in a rotationally fixed, but preferably axially movable manner, and a spring-loaded locking element 27 which interacts with the locking wheel 26 and is mounted in a movable manner on the support 5 (it can be dispensed with here if, as in the illustrated embodiment, the locking element 27 is formed sufficiently wide, if it is possible that the locking wheel 26 is mounted in an axially movable manner on the rotary shaft 22). It is also preferred here that the locking element 27 is designed to interact with the chair base 1 when the chair is not loaded and that the locking wheel 26 is released and that the locking wheel 26 is locked when the chair is loaded. Furthermore, as can be seen in particular from fig. 13 and 14, it is particularly preferred to provide that the locking wheel 26 has a saw tooth toothing, in other words in any case reliably prevents the slide 13 from moving on the support surface 5.1 in the direction of the pivot bearing 15.

Since the adjusting wheel 17 is preferably fixedly connected to the rotary shaft 22, it is furthermore preferably provided that the adjusting element 6 is mounted so as to be displaceable parallel to the axis of rotation of the support 5, at least in the region of the adjusting wheel 17.

Finally, guide elements 28, preferably in the form of bolts, acting on the adjusting element 6 from the outside are correspondingly provided on both sides of the adjusting wheel 17, preferably in order to ensure a good guidance of the adjusting element 6.

List of reference numerals

1. Chair base

2. Chair seat

3. Backrest for chair

4. Spring

5. Support seat

5.1 Bearing surface

5.2 First tooth part

5.3 Second locking element

6. Adjusting element

7. Connecting element

8. Longitudinal guide device

9. Backrest carrier

10. Chair seat supporting body

11. Rotary joint

12. Rotary support

13. Slide seat

14. Telescopic guiding device

15. Rotary bearing

16. Groove(s)

17. Adjusting wheel

18. Second spring

19. Telescopic guiding device

20. Chair leg

21. Force transmission device

21.1 Second tooth part

22. Rotary shaft

22.1 First locking element

22.2 Curve guiding device

23. Spring element

24. Adjusting rod

24.1 Bolt

25. Guide element

26. Locking wheel

27. Locking element

28. Guide element

Claims

1. Chair comprising a chair base (1), on which a seat (2) and a backrest (3) connected to the seat (2) by means of a synchronization mechanism are movably supported, wherein a spring (4) is provided which presses the seat (2) into the initial position of the chair and a support (5) which is rotatably supported on the chair base (1), wherein the support (5) is configured to interact on the one hand with a connecting element (7) which is connected to the front edge of the seat (2) and on the other hand with the end of the spring (4),

Wherein the connecting element (7) interacting with the support (5) is designed to be guided in a longitudinal guide (8) and is arranged in the uppermost position of the longitudinal guide (8) in the initial position of the seat,

Wherein a swivel bearing (15) is provided for fixing the support (5) to the chair base (1), the swivel bearing (15) being configured to be arranged on one end of the support (5) and the connecting element (7) being configured to be fitted on the other end of the support (5).

2. Chair according to claim 1, characterized in that the longitudinal guide (8) for the connecting element (7) is configured in an upright position of the chair obliquely downwards, seen from the front edge of the seat (2) in the direction of the backrest (3).

3. Chair according to claim 1 or 2, characterized in that two seat carriers (10) are provided which are connected to one another by means of the connecting element (7), wherein the chair base body (1) is arranged between the two seat carriers (10) and the connecting element (7) is movably supported on the chair base body (1).

4. Chair according to claim 1 or 2, characterized in that a backrest carrier (9) which can be swung about a horizontal axis is supported on the chair base (1).

5. A chair according to claim 3, characterized in that the backrest carrier (9) and the two seat carriers (10) are connected to each other by two rotary joints (11) with a horizontal axis, which are movable independently of the chair base (1).

6. Chair according to any one of claims 1 to 2 and 5, characterized in that the connecting element (7) operatively connected to the seat (2) by means of the seat carrier (10) is configured to be operatively connected to the seat (5) for the spring (4).

7. Chair according to claim 6, characterized in that between the connecting element (7) and the support (5) a force transmission means (21) is arranged.

8. Chair according to claim 7, characterized in that the support (5) has a first toothing (5.2) on the force transmission device side, the force transmission device (21) has a second toothing (21.1) on the support side, and the two toothings (5.2, 21.1) are each configured to curve convexly towards each other and engage each other.

9. Chair according to claim 7 or 8, characterized in that the support (5) is of arcuate construction and that the teeth (5.2) on the force transmission side are arranged on the convex outer side of the support and that the bearing surface (5.1) for the spring (4) is arranged on the concave inner side of the support (5).