EP0834271B1 - Sitting furniture with tiltable seat and backrest - Google Patents

Abstract

The chair has a support column (14) which has a flange (3) which stretches underneath the seat (2) to the bottom of the front edge of the seat. A first bearing (A) is arranged at the front of the flange. A second bearing (D) is provided at the upper end of the support column in which a connecting rod mounting (4) is rotatably supported. The mounting has an eccentric third bearing (C). A connecting rod (8) is supported in the third bearing and is rigidly connected at an angle with the backrest (1). The connecting rod has a fourth bearing (B) between its connection with the backrest and its joint to the mounting (4). The seat is supported in its rear region in the fourth bearing.

Description

TECHNICAL AREA

The invention relates to seating, in particular a Office swivel chair, with a reclining backrest, one reclining seat positively coupled to the backrest, and a column located under the seat, the seat in its front area rotatable in a first, unchangeable in height, on one itself below the Front edge of the seat extending arm of the pedestal arranged bearing is stored at the upper end of Stand column a second camp is provided, in which a Handlebar mount is rotatably mounted, which is eccentric has third bearing, and being in the third bearing Handlebar is mounted, which is rigid at an angle with the Backrest is connected, and that between his Connection with the backrest and its articulation on the Handlebar mount has a fourth bearing in which the seat is stored in its rear area.

STATE OF THE ART

Such seating is for example from EP 0559185A1, DE 3530188A1, or DE 440123A1 known. With these known The tilt mechanism is based on the basic idea, that the backrest support below its linkage to the Seat support eccentrically on the rigid extension rotatable handlebar mount is articulated. This will a quite advantageous seat and backrest tilt mechanism achieved, however, the specific embodiments for Printing units, e.g. Gas springs between the seat and Backrest, designed what is technical, ergonomic and also restrictions disadvantageous in terms of user comfort results.

From EP-B 0233974 a seat is known in which the Seat is hinged in the front of a housing that rests in its center on the upper end of the pillar. The The backrest support points into this housing extending bracket on which in the housing in Bearing arranged near the column support is pivotable.

A similar piece of seating furniture is known from EP-B 0489961: There, too, the seat is in a fixed height Bearing stored, and an angular backrest bracket swivels about an axis of rotation in the area of the upper end of the pedestal inside a housing.

The two known seating furniture have the advantage that the Front edge of the reclining seat remains unchanged in height, and thus the undesirable lifting of the thighs of the Avoided by the user when reluctant. Furthermore, by the arrangement of the axis of rotation is achieved below the seat, that the relative movement occurring when the backrest is tilted between the back and the back of the user leading to the unwanted "shirt pull-out effect" leads, is reduced.

However, both seating furniture have the disadvantage that Integration of the backrest support into the Mechanical housing the constructive free space too narrow is so that the complex body movement of the user when Tilting the seat and backrest is by no means optimal can be worn.

PRESENTATION OF THE INVENTION

It is therefore the object of the invention to seat the known way to improve that the movements from the seat and backrest when leaning against the complex Body movements of the user are adjusted, however at the same time to produce the seating furniture inexpensively are and appeal aesthetically.

This object is achieved by the features of claim 1 and of the subclaims solved.

The essence of the invention is that the axis of rotation of the lower angled backrest support eccentrically on the rotating Handlebar mount is provided, and this with one around same bearing rotatable pulley is firmly connected to the via a rope and tension springs on the front edge of the boom the column is anchored. It doesn't just make one complex body movements that are particularly adaptable to body movement Backrest movement achieved, but the inclination elements for the The backrest can also be arranged outside the mechanical housing be, so that a maximum of constructive freedom arises. On top of that, this allows elegant aesthetic Achieve effects, and the effort for production and assembly can be remarkably reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

eine Seitenansicht eines Sitzmöbels nach der Erfindung,

Fig. 2

eine perspektivische Darstellung der Federmechanik,

Fig. 3

eine perspektivische Darstellung der Arretiervorrichtung in der Federmechanik,

Fig. 4

eine erste Ausführungsform einer bistabilen Betätigungsmechanik für die Arretiervorrichtung, und

Fig. 5

eine zweite Ausführungsform einer bistabilen Betätigungsmechanik für die Arretiervorrichtung.

The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawings. It shows:

Fig. 1

a side view of a seat according to the invention,

Fig. 2

a perspective view of the spring mechanism,

Fig. 3

a perspective view of the locking device in the spring mechanism,

Fig. 4

a first embodiment of a bistable actuating mechanism for the locking device, and

Fig. 5

a second embodiment of a bistable actuating mechanism for the locking device.

WAYS OF CARRYING OUT THE INVENTION

1 shows a backrest 1 and a seat 2 of an office swivel chair shown. The chair is through the pedestal 14 worn to which seat 2 with backrest in a known manner are rotatable.

The standing column 14 has one up to below the front edge of the seat 2 extending boom 3, which at its Front edge 15 carries the first bearing A. At this camp A the seat 2 is pivotally mounted.

On the pillar 14, the second bearing D is provided above. This bearing D is usually rotatable disc-shaped handlebar mount 4 mounted, the eccentrically has a third bearing C.

The handlebar 8 is rotatably mounted on this third bearing C. This is V-shaped, with the bearing C on the top of the V-angle. The handlebar 8 is with his lower leg rigid with the backrest 1 connected. He wears it at the end of his upper thigh fourth bearing B, on which the seat 2 in its rear Area is stored.

Seat 2 and backrest 1 can now be moved around the four Swing the bearing up and down. Bearings A and D remain stationary, while camps B and C and with them backrest 1 and seat 2 change their positions or inclinations. To do this illustrate the individual elements in a first Position shown with solid lines, and in one second and third with dashed lines. The different locations of the camps are indicated by B0, B1 and B2, as well as C0, C1 and C2.

As can be seen, the seat 2 is not tilted due to the fixed position of bearing A, the knees are raised or the thigh of a user. Experienced at the same time the buttocks of the user by the inclination of the seat 2 one Support and does not slide forward.

The backrest 1, on the other hand, performs a free movement on the handlebar 8 around the bearing C on the handlebar mount 4. By suitable Design of the handlebar 8 and arrangement of the eccentric Camp C succeeds in moving the backrest 1 to the complex movement of the body, especially the back of the Adapt optimally to the user.

The boom 3 is advantageously a housing trained, preferably made of die-cast aluminum. It can then the spring mechanism required for the furniture record while handlebar mount 4 and handlebar 8 outside of the housing can be provided.

The spring mechanism is shown in Fig. 2:

It comprises two pulleys 5 which rotate about the same bearing D. like the handlebar mount 4, and firmly connected to it are. Ropes 6 run on the pulleys 5, which are on springs 7 hang. These springs 7 in turn hang on the front Double hook, which on a deflected rope on one Worm gear 16 hangs. The double hook is in the shown arrow direction movable back and forth, so that Actuation of the worm gear 16, the bias of Springs 7 can be adjusted.

In the embodiment shown in FIG. 2, seat 2 and backrest 1 freely around the bearings C and D against the force of Swing springs 7. So in this position there is a "dynamic sitting" with permanent contact between backrest 1 and the user's back.

To adjust the inclination of backrest 1 and seat 2 once lock, is the locking mechanism shown in Fig. 3 intended:

It comprises a lever 13 which (in not shown here Way) from outside the case by the user around the drawn axis can be rotated. This will make a Linkage 12 moves, the one rotatable about an axis K. Leg spring 11 actuated. By means of this leg spring 11 becomes a locking pin 9 in the direction of the arrow moved back and forth when the force of the leg spring 11 the Persistence of the bolt exceeds 9. The bolt 9 is able to snap into the locking holes 10 of the pulley 5, which then this role 5 and with it the handlebar mount 4th and then seat 2 and backrest 1 are fixed.

The actuation of the locking bolt 9 via the leg spring 11 has the effect that the bolt 9 cannot then be moved, if its persistence is greater than the power of Leg spring 11. This is particularly the case if the Bolt 9 is engaged in a locking hole 10, and no User sits on the seating because then the power of Springs 7 act on the engaged bolts 9. This will achieved that an unintentional loosening of the locking mechanism not possible when the seating furniture is not in use is.

However, if the locking is to be released, the User by pushing his back on the backrest 1 Compensate force of the springs 7, thereby reducing the persistence the bolt 9 is low and a disengagement over the Leg spring 11 is possible.

The mechanism not shown in Fig. 3 for actuating the Lever 13 from the outside is shown in FIGS. 4 and 5:

In both embodiments, there is a selector shaft 17 provided that the user bent over the one hand Handle at the outer end towards the drawn one Double arrow can be moved, and the other hand over the lever 13 at the inner end of the movements on the linkage 12 transmits. So that the locking pin 9 in the Locking holes 10 are engaged or disengaged.

But it is now desirable that the lever 13 in its two Extreme positions each take a stable position can. This allows the user to choose either leave the locking bolts 9 disengaged and free swing or "sit dynamically", or by means of locked locking pin 9 the selected seat and Fix the backrest angle.

This is shown in the embodiment in FIG. 4 by the clip 18 reached, and in Fig. 5 by the knob 19th

Clip 18 and knob 19 are preferably made of spring steel, and act on suitable recesses in lever 13.

In order to minimize the effort for production and assembly, are all bearing and fastening elements for the spring, Locking and actuating mechanism in the lower part of the Die-cast aluminum housing. The chair base can therefore almost in a simple, open manner completely assembled, and the housing is then through completed a simple lid. On this base then only seat 2 and backrest 1 in bearings A and (via the V-handlebar 8) C attached.

The construction according to the invention is not only technical Advantages, but also offers an original and elegant aesthetic appearance.

name list

1

backrest

2

Seat

3

boom

4

handlebar mount

5

pulley

6

rope

7

feather

8th

handlebars

9

locking pin

10

locking bore

11

Leg spring

12

linkage

13

lever

14

pedestal

15

Front edge of the boom

16

worm gear

17

shift shaft

18

clip

19

burl

A

first camp

B

fourth camp

C

third camp

D

second camp

K

Axis of the swivel spring

Claims (7)

1. Piece of seating furniture, in particular swivel chair for the office, having a tiltable backrest (1), a tiltable seat (2), which is positively coupled to the backrest (1), and an upright (14), which is arranged beneath the seat (2), it being the case that the seat (2), in its front region, is mounted rotatably in a first bearing (A), which cannot be changed in terms of height and is arranged on an extension arm (3) of the upright (14), the extension arm extending beneath the front edge of the seat (2), that provided at the top end of the upright (14) is a second bearing (D), in which there is rotatably mounted a link mount (4) which, eccentrically, has a third bearing (C), and that mounted in the third bearing (C) is a link (8) which is connected rigidly, at an angle, to the backrest (1) and which, between its connection to the backrest (1) and its articulation on the link mount (4), has a fourth bearing (B), in which the seat (2) is mounted in its rear region, characterized in that fixedly connected to the link mount (4) is a cable pulley (5) which can be rotated about the same bearing (D) and on which a cable (6) connected to a spring (7) runs, and the spring (7) is anchored on the front edge (5) of the extension arm (3) .
2. Piece of seating furniture according to Claim 1, characterized in that the spring (7) is anchored on the front edge (15) of the extension arm (3) via a worm drive (16), by means of which the stressing of the spring (7) can be adjusted.
3. Piece of seating furniture according to Claim 1, characterized in that the cable pulley (5) has latching bores (10) which are distributed over a circle arc around the bearing (D) of the cable pulley and into which an arresting pin (9) can be latched.
4. Piece of seating furniture according to Claim 1, characterized in that the extension arm (3) is designed as a housing, the link mount (4) is located outside this housing, and the link (8) is of V-shaped design, the bottom leg of the link (8) being connected to the backrest (1), and the top leg carrying the fourth bearing (B).
5. Piece of seating furniture according to Claim 4, characterized in that the arresting pin (9) can be moved back and forth by means of a leg spring (11), which can be pivoted about an axis (K) and can be actuated via a linkage (12) from outside the mechanism housing (3).
6. Piece of seating furniture according to Claim 5, characterized in that the linkage (12) is connected to the lever (13) at the inner end of a control shaft (17) which the user can move from the outside by means of a handle provided at its outer end, the lever (13) being capable of remaining in a stable manner in its two extreme positions in that it acts either at its top part against a clip (18) or at its bottom part against a protrusion (19).
7. Piece of seating furniture according to Claim 5, characterized in that the springs (7), cable pulleys (5) and arresting mechanism (9, 11, 12) are accommodated in the extension arm (3) designed as a housing, and the housing is an aluminium pressure die casting in which the bearing and fastening elements necessary for the pulleys (5), springs (7) and arresting mechanism (9, 11, 12) are formed.

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