EP3612701A1

EP3612701A1 - Pivot drive and piece of furniture

Info

Publication number: EP3612701A1
Application number: EP18719778.5A
Authority: EP
Inventors: Uwe Sobolewski; Michael Tasche; Gerhard Götz
Original assignee: Hettich ONI GmbH and Co KG
Current assignee: Hettich ONI GmbH and Co KG
Priority date: 2017-04-18
Filing date: 2018-04-12
Publication date: 2020-02-26
Anticipated expiration: 2038-04-12
Also published as: AU2018255813A1; US11060337B2; AU2018255813B2; RU2019133591A3; BR112019019881A2; EP3612701B1; CN110520588B; WO2018192835A1; US20200123827A1; RU2760649C2; CA3057953A1; CN110520588A; DE102017108197A1; RU2019133591A

Abstract

A pivot drive (30) for a movable piece of furniture (3, 25, 25') comprises an actuating arm (32), which is mounted such that it can be pivoted about an axis of rotation (31), a spring assembly (33), having at least one spring guided linearly in a working direction, a pressure-exerting component (34, 34'), which is connected to the spring assembly (33) and can be displaced along a control curve (35, 35'), and a housing (21), on or in which the pivot drive is mounted, wherein the actuating arm (32) is connected in a rotationally fixed manner to the spring assembly (33) and can be pivoted therewith about the axis of rotation (31), and it is possible to adjust the control curve (35, 35') relative to the axis of rotation (31), in order to set the spring force of the spring assembly (33), and/or it is possible to adjust the force by which the spring assembly (33) acts on the control curve.

Description

Quarter turn actuator and furniture

The present invention relates to a pivot drive for a movable furniture part with a pivotally mounted about an axis adjusting arm, a spring assembly with at least one linearly guided in a direction of action spring and connected to the spring assembly pressure piece, which is movable along a control cam, and a housing or in which the slewing drive is mounted and a piece of furniture.

DE 20 2010 015 091 U1 discloses a furniture fitting for driving a flap, in which a power drive with springs acts on a force deflection lever to bias a joint drive in the opening or closing direction. To adjust the force, a coupling member can be adjusted on the lever. It is disadvantageous that different spring forces and a different spring force course depending on the opening position of the flap is required for different widths and heavy flaps. The adjustment options for this furniture fitting are insufficient.

WO 2016/077851 discloses an actuator for moving a furniture part, in which a spring device acts on a rotatable actuating arm via a transmission mechanism. A pressure piece loaded by a spring device can be moved along a setting contour, which can be adjusted relative to the setting part in order to set the spring force. Although such an actuator allows a compact design, but the settings are limited because the control contour is arranged between the pressure piece and the actuator arm. This leads to unfavorable leverage and problems with a required contour change of the control contour.

It is therefore an object of the present invention to provide a pivot drive and a piece of furniture, by means of which a force acting on an actuating arm is flexible adjustable for different positions of the actuating arm. Furnishings for a room are understood to mean a piece of furniture, whereby the furnishing items may also be household appliances such as, for example, a refrigerator. This object is achieved with a pivot drive with the features of claim 1.

The rotary actuator according to the invention comprises a rotatable actuator arm which is rotatably connected to a spring assembly and is pivotable together with this about a rotation axis, wherein the spring assembly acts on a pressure piece which is movable along a cam which relative to the axis of rotation of the actuating arm for adjusting the Spring force of the spring assembly is adjustable. The actuator arm is connected via a multi-joint connection with the movable furniture part, wherein additionally or alternatively the

Force of the spring assembly on the cam is adjustable. As a result, the control cam and the axis of rotation for the actuator arm and the spring assembly can be arranged on opposite sides of the spring assembly, so that the relative adjustment options on the control cam are flexible and also the travel of the pressure piece along the control curve is structurally not limited. This results in favorable leverage and a simple structure, since the actuator arm is rotatably connected to the spring assembly and adjusting the spring force, the control cam is adjusted relative to the fixed axis of rotation.

Preferably, the cam can be adjusted continuously via adjusting means. This allows a precise adjustment of the forces acting on the actuator spring forces. The rotary actuator may comprise a housing on or in which the control cam is adjustably held, for example via guide means, thread adjustments, eccentric adjustment, screw adjustments or other mechanical means. The control cam can be mounted rotatably and / or displaceable relative to the axis of rotation of the actuating arm in order to make a flexible adjustment can. If the control cam is adjustable in the effective direction of the spring assembly, the size of the force applied by the spring assembly can be changed. This is alternatively possible by changing the bias of the spring assembly. If, on the other hand, the inclination of the control cam is changed, the force acting in a certain opening position of the actuating arm is adjusted, which is advantageous in particular for differently heavy flaps, since in these cases the center of gravity displaces outwardly from a furniture carcass when being opened, and thus dependent on the opening position different spring forces to compensate for the flap weight are required. In a further embodiment, the spring assembly biases the actuating arm in a closing region in the closing direction, and in an opening region which is adjacent to the closing region, the spring assembly biases the actuating arm in the opening direction. As a result, a dead center is traversed during an opening movement of the actuating arm, and it changes the direction of force on the actuating arm depending on the position of the actuating arm. In this arrangement, the spring assembly pivots during the opening movement in both directions. In a further embodiment, the spring assembly biases the actuating arm in a closing region in the closing direction, and in an opening region which is adjacent to the closing region, the spring assembly biases the actuating arm in the opening direction. The change in the effective direction of the spring is achieved by the shape of the control cam. At the beginning of an opening movement of the actuating arm, a distance of the control cam is passed, in which the spring assembly is tensioned and in the course of the opening movement, the spring assembly is relaxed. In this arrangement, the spring assembly pivots during the opening movement only in one direction. The actuator arm can be connected via a multi-joint connection with a flap or door. Preferably, the pivot drive is designed as a flap fitting to pivot a flap about a horizontal axis. But other purposes are possible. The flap can thus perform the movement of a flap, a lid or a bar compartment. The multi-link connection can be designed as a four-bar linkage with two parallel levers or as a seven-bar linkage, but other multi-link connections can also be provided on the pivoting drive.

In order to be able to transmit high forces via the spring assembly on the actuator arm, the control cam preferably has an existing metal guide rail. Also, the pressure piece may have a role, which has at least one surface of metal, and preferably completely made of metal, so that high forces between the pressure piece and guideway can be transmitted.

For a flat construction of the spring assembly, this may comprise a plurality of juxtaposed coil springs, which are linearly guided in the effective direction of the spring assembly. Instead of a coil spring disc springs or leaf springs or other compact springs can alternatively be used. Preferably, the control cam is immovable relative to the housing during an opening and / or closing movement of the movable furniture part, so that a furniture body, the control cam and the housing are arranged stationary while the movable furniture part and the spring assembly move. In this case, the axis of rotation about which rotates the spring assembly with the actuating arm, be arranged stationarily in the housing, so that the spring assembly pivots with the actuating arm about this axis of rotation. In one embodiment of the multi-joint connection, a lever has two axes of rotation for moving the movable furniture part and another joint or curve guide for indirect coupling with the actuating arm. For an effective power transmission can be arranged on the actuating arm, a pressure piece which cooperates with the cam guide of the lever.

The total pivot angle of the spring assembly about the axis of rotation may be greater than 10 ° from the closed position to the fully open position of the movable furniture part, for example between 10 ° to 60 °. The pivot drive may also include one or more dampers that decelerate the actuator arm before reaching the closed position and / or a maximum open position. Such dampers can be mounted as a linear damper, rotary damper both within a multi-joint connection or on the spring assembly.

The rotary actuator according to the invention is preferably used in a piece of furniture, in particular to pivot a flap. Preferably, the pivot drive is arranged in a side wall of a furniture body, so that the inner useful volume of the furniture body is not reduced by the pivot drive. Optionally, the pivot drive can also be fixed to an inside of a furniture body, which then reduces the usable internal volume. If the pivot drive is provided in a side wall, the side wall may have a recess for receiving a housing of the pivot drive. The housing of the pivot drive then has an opening directed towards the front opening, which allows a movement of one or more articulated arms out of the side wall or the housing of the pivot drive when opening a flap. Preferably, the side wall has a plate-shaped core, which has a first end side and further end faces, wherein a recess is arranged in the core, which extends at least along a portion of the first end side of the side wall and serves to receive a flap fitting, which guides a movable furniture part , The plate-shaped core of the side wall is preferably arranged between two laterally applied cover layers. Optionally, the core may have two core halves, which lie on one another with their side surfaces opposite the respective cover layers and have recesses complementary to the recess. In such a side wall of the pivot drive is arranged on a side wall of the furniture.

The invention will be explained in more detail with reference to several embodiments with reference to the accompanying drawings. FIGS. 1 to 3 show several views of furniture with different views

Fold fittings;

Figures 4A to 4H show several views of the assembly of a piece of furniture with the

Arrangement of a rotary actuator in a side wall of the furniture;

Figure 5 is a perspective view of a modified piece of furniture with a pivot drive in the side walls; FIGS. 6A to 6G show several views of a pivot drive in different positions according to a first embodiment;

FIGS. 7A to 7D show several views of a pivot drive in different positions according to a second embodiment;

FIGS. 8A to 8D show several views of a pivot drive in different positions according to a third embodiment;

9A to 9D show several views of a pivot drive in different positions according to a fourth embodiment, and FIGS. 10A to 10C show several views of a pivot drive in different positions according to a fifth exemplary embodiment.

A piece of furniture 1 comprises a cabinet-shaped furniture body 2, with side walls 10, a top floor 15 and a bottom 14, on which a flap 3 is pivotably mounted. For this purpose, a flap fitting 4 is provided, by means of which the flap 3 can be pivoted upwardly, as shown schematically by the arrow. The flap fitting 4 is biased by a pivot drive, not shown here, wherein the spring force is dependent on the opening position of the flap 3.

In Figure 1, the flap fitting 4, for example, as a multi-joint connection, in particular as Siebengelenkverbindung formed. It is also possible to form the flap fitting as a four-bar linkage, as shown in Figures 2 and 3. On the furniture body 2, a flap 3 is pivotally mounted, which is movable by two parallel levers 5 and 6, which is held via a connection 7 or 7 'on the levers 5 and 6. In Figure 2, the flap 3 is pivoted substantially forward and upward, while in Figure 3 levers 5 'and 6' are provided with a modified connection 7 ', by means of which the flap 3 along another curved path at least partially pivoted over the topsoil 15 can be. The flap fittings 4 according to the figures 1 to 3 can be optionally fixed to an inner side of the side walls 10 or in the side walls 10th

In order to provide a fitting in a side wall 10, a corresponding mounting method will be described with reference to FIGS. 4A to 4H. A side wall 10 comprises an inner core 1 1, for example of an MDF or HDF or lightweight panel, in which a recess 12 is introduced, for example by milling. The core 1 1 is covered on opposite sides by cover layers 13, which also cover the recess 12, so that a pocket-shaped receptacle is formed, which is open only at a front end side.

As shown in FIG. 4C, a fitting 20 with a housing 21 can be inserted into the recess 12. The housing 21 comprises a pulp te, which corresponds to the width of the core 1 1 and may for example be between 12 mm and 22 mm, in particular 12 mm to 17 mm. The housing 21 may also be narrower than the width of the core when the housing 21 is inserted into the side in a different manner. The housing 21 comprises two spaced-apart plates, between which levers of a multi-joint connection are provided, the axes of rotation of which are at least partially fixed to the housing 21. In the illustrated embodiment, the lower arm 22 is rotatably mounted on a rotational axis 23 of the housing 21. Further, an upper arm 24 is spaced from the lower arm 22, which is provided via a arranged in a receptacle 27 a hollow chamber of the housing 21.

In FIG. 4D, the side walls are shown without cover layers 13, and it can be seen that the fitting 20 with the housing is inserted substantially in a form-fitting manner into the recess 12 of the core 11. On the fitting 20 are mounted on the arms 22 and 24 flap parts 25 and 26, wherein on the arm 24, an upper flap part 25 and on the lower arm 22 a lower flap part 26 are held, and the two flap parts 25 and 26 via a hinge connection with each other are connected, wherein the flap formed by the Klappentei- 25 and 26 unfolds when opening.

In FIGS. 4E and 4F, two positions of the furniture 1 are shown, wherein the side walls 10 are closed by the cover layers 13, so that the housing 21 of the fitting 20 is no longer visible. If the flap consisting of the flap parts 25 and 26 is opened, the arms 22 and 24 protrude out of the housing 21 of the fitting to the front.

In FIGS. 4G and 4H, the furniture with the fitting 20 is shown in an open position, and it can be seen that the fitting 20 with the housing 21 is received in the side wall 10.

In Figure 5, a modified furniture is shown, in which a furniture body has a plurality of adjacent interior spaces, and between the two outer side walls one or more central partitions are provided. At each middle partition also a fitting 20 is provided so that a

Flap with flap parts 25 'and 26' is formed significantly wider than in the previous embodiment. The flap parts 25 'and 26' are held by a plurality of fittings 20 on the furniture body. The number of partitions can be freely selected depending on the width of the furniture. In Figure 6A, the fitting is schematically shown with a pivot drive 30 according to the invention, which is arranged in the housing 21. The fitting 20 is designed as a seven-joint hinge and comprises two stationary axes on the housing 21 arranged axes of rotation A1 and A2, which form a hinge connection via joints with five further axes of rotation A3 to A7, on which at a connection 38, the flap 3 is fixed. Such multi-joint compounds are known in different variants and are therefore shown only schematically.

The pivot drive 30 comprises an actuating arm 32 which is rotatably mounted about a rotation axis 31 which is arranged stationarily on the housing 21. The actuating arm 32 is connected via a movable joint 39 to a pivot lever 36 which is connected via a further joint 40 to a lever 37 of the multi-link arrangement. The lever 37 is designed as a double lever, so that the pivot point A3 and the joint 40 are always pivoted at the same distance about the axis of rotation A1.

The actuator arm 32 is rotatably connected to a spring assembly 33 which comprises one or more springs which are linearly movable and on a linear guide, for example by rods, sleeves or other linear guide elements, are compressible and expandable. The spring assembly 33 is mounted on one side on a rotation axis 31. On the other side of the spring assembly 33, the spring assembly 33 acts on a pressure piece 34. The pressure piece 34 is formed as a roll, in particular made of metal, and can be moved along a control cam 35. The control cam 35 is held adjustable in the housing 21 and preferably also consists of metal, for example steel.

The control cam 35 can be adjusted relative to the axis of rotation 31, as indicated by the two arrows. The control cam 35 can first be compressed or expanded in the effective direction of the spring assembly 33, ie in the direction of a line between the rotation axis 31 and an axis of the pressure piece 34, by the control cam 35 being adjusted accordingly. For this purpose, corresponding adjusting means, in particular thread displacements, eccentrics or screws, can be provided on the control cam, which are supported on the housing 21 and thus permit an adjustment of the control cam 35. In order to produce the same effect, it is also possible to compress or expand the spring assembly 33 by means of corresponding adjustment means, in particular thread adjustments, eccentrics or screws. In addition to the linear adjustment, the cam 35 may also be pivotable, preferably about a pivot point which is adjacent to the pressure piece 34 in a closed position of the fitting. As a result, the force acting on the actuating arm 32 by the spring assembly 33 can be adjusted for different opening positions of the flap 3, without the control curve 35 having to be exchanged. Since different weights act on the actuating arm 32 in the case of doors of different widths depending on the opening position, the spring force for different opening positions can be changed by such a pivoting adjustment. Preferably, the pivot drive 30 according to the invention comprises both a linear adjustment and a pivoting adjustment for the control cam 35, wherein optionally also further adjustment can be provided, for example, individual sections of the control cam 35 can be adjusted relative to each other.

In Figure 6A, the closed position of the flap 3 is shown, in which this substantially vertically covers an opening on the furniture body 2. If the flap 3 is pivoted in the opening direction, as shown in FIG. 6B, the multi-joint arrangement moves with the lever 37 about the axis of rotation A1 in the counterclockwise direction, and a compressive force is transmitted to the articulated lever 36, whereby the actuating arm 32 in a clockwise direction through the axis of rotation 31 is turned. As a result, the pressure piece 34 also moves in a clockwise direction along the cam, which is curved toward the spring assembly 33, so that when a movement of the spring assembly 33 in the clockwise direction, the pressure piece 34 is pressed against the spring assembly 33, so that when opening the flap 3 the Act forces in the closing direction and must be overcome by the user when opening the door 3. The flap 3 is moved further in the opening direction according to FIG. 6C, and in a predetermined opening position, for example at an angle of the flap 3 between 20 ° and 30 °

Lock position, a dead center will go through. In the region of the dead center, the joint 40 is located on a line that runs through the axis of rotation A1 and the articulated lever 36. The pressure piece 34 has been moved along the control cam 35 in a maximum position. If the flap 3 is further moved in the opening direction from the dead center position shown in Figure 6C, as shown in Figure 6D, by turning the double lever 37 counterclockwise, the articulated lever 36 is pulled over the joint 40, so that the actuator arm 32 against the Clockwise about the rotation axis 31 is rotated. As a result, the pressure piece 34 moves back along the control curve 35, and the spring assembly 33 is relaxed during this movement, so that the movement of the flap 3 is supported by the spring assembly 33.

The flap 3 can now be moved in the opening direction according to the representation of Figures 6E, 6F and 6G, for example, up to a maximum opening position of 100 ° to 120 ° relative to the closure position. During this rotational movement of the actuator arm 32 is pivoted counterclockwise, and the pressure piece 34 moves accordingly along the control cam 35 which is designed so that relaxes the spring assembly 33 during this rotational movement. This will pass through the flap 3 on the

Fitting force applied by the spring assembly 33 at least partially compensated, it being possible to adjust the spring assembly 33 with the actuator arm 32 so that the weight of the flap 3 is fully compensated and the user essentially only has to apply the forces to move the flap 3 , The forces of the spring assembly 33 can also be adjusted so that the flap opens automatically from a certain opening angle. Also, the control curve can be designed independently of the spring assembly 33, which opens the flap automatically from a certain opening angle.

The flap 3 is forcibly guided relative to the pivot drive 30, so that in a closing movement, the opposing movements are performed. Firstly, when closing from the position shown in FIG. 6G to the position shown in FIG. 6C, forces must be exerted by the user in order to re-compress the spring assembly 33, which is pivoted about the rotation axis 31 and thereby via the pressure piece 34 and the control cam 35 is compressed. When the dead center is reached, no more force is transmitted via the spring assembly 33 to the actuating arm 32, and only in a further closing movement, the spring assembly 33 then acts in the closing direction. The flap 3 can be biased in the closing direction over the pivot drive 30 in a closing range of, for example, 0 ° to 20 ° or 0 ° to 30 ° and is in an opening area adjacent to this closing area on the

Rotary actuator 30 biased in the opening direction. Optionally, the pivot drive 30 may comprise a damper, for example, a linear damper, which ensures that the flap 3 is decelerated before reaching the closed position and / or the maximum opening position, so that no loud impact noises arise. Such a damper can For example, on the spring assembly 33 or the actuator arm 32 or the housing 21 to dampen the pivotal movement of the spring assembly, be appropriate.

In the following embodiments, further rotary actuators are shown, wherein the same components with the same reference numerals as in the embodiment of Figure 6 are designated. Therefore, only the differences from the exemplary embodiment shown in FIG. 6 will be discussed in detail. In the embodiment shown in Figure 7A to 7D, the spring assembly 33 is no longer arranged in the closed position of the flap 3 with the effective direction substantially vertically, but obliquely. As a result, the pressure piece 34 and the control cam 35 can be arranged closer to the flap 3, which facilitates the actuation of an adjusting mechanism from a front side of the furniture body. The actuator arm 32 is otherwise coupled as in the previous embodiment via a hinge lever 36 with the multi-joint connection, on which the flap 3 is held. Incidentally, the operation of the rotary actuator with the spring assembly 33 which acts on the pressure piece 34 which is movable along the control cam 35, as in the previous embodiments.

FIGS. 8A to 8D show a further exemplary embodiment of a pivoting drive, in which the setting arm 32 is again connected to the flap 3 via an articulated lever 36 with a multi-joint connection. The spring packet 33 is arranged rotated in the housing 21 of the fitting 20 compared to the other embodiments, wherein the pressure piece 34 and the control cam 35 are arranged facing the back of the furniture body. The axis of rotation 31 of the actuating arm 32, however, is adjacent to the flap. 3

FIGS. 9A to 9D show a further exemplary embodiment of a swivel fitting in which a modified control cam 35 'is provided, which serves to guide a modified pressure piece 34'. The control cam 35 'is formed as a linear guide, which is arranged inclined to the direction of action of the spring assembly 33, so that in a method of the pressure piece 34' relative to the control cam 35 ', the spring assembly 33 is relaxed or stretched.

In the exemplary embodiment of FIGS. 9A to 9D, when the flap 3 is opened no dead center is passed through, but the pressure piece 34 'moves linear along the control cam 35 'over the entire pivoting range, so that the spring assembly 33 moves during the opening movement in one direction only. Due to the arrangement of the actuating arm 32 and the connection between the actuating arm 32 and the lever 37, a change of direction of the closing and opening force can be generated here.

In addition, the pivot drive 30 is not coupled in the embodiment shown in Figure 9A to 9D via a joint 40, but on the actuator arm 32, a further pressure piece 45 is provided, for example, a roller which is movable along a cam guide 41. The cam guide 41 is rotatably connected to a lever 37 of the multi-joint arrangement, and by turning the cam guide 41 about the axis of rotation A1, the pressure piece 45 and thus the actuating arm 32 is pivoted. When opening the flap 3, the cam guide 41 pivots counterclockwise, and the actuating arm 32 pivots thereby counterclockwise.

A further exemplary embodiment is shown in FIGS. 10A to 10C, in which a spring assembly 33 is coupled in a rotationally fixed manner to an actuating arm 32 on which a pressure piece 45 is fixed. The pressure piece 45 is again movable along a cam guide 41, which is pivoted counterclockwise when the flap is opened. The position of the spring assembly 33 and the dimensioning are different from the embodiment shown in Figure 9.

The illustrated embodiments may be combined with each other as desired to modify the transmission mechanism from the flap 3 or other movable furniture part to the control cam 35 or 35 'out.

LIST OF REFERENCE NUMBERS

1 furniture

2 furniture carcass

3 flap

4 flap fitting

5, 5 'lever

6, 6 'lever

7, 7 'connection

10 sidewall

1 1 core

12 recess

13 topcoat

14 floor

15 topsoil

20 fitting

21 housing

22 arm

23 axis of rotation

24 arm

25, 25 'flap part

26, 26 'flap part

27 recording

30 quarter turn actuator

31 axis of rotation

32 actuator arm

33 spring package

34, 34 'pressure piece

35, 35 'cam

36 articulated lever

37 lever / double lever

38 connection

39 joint

40 joint

41 curve guide

45 pressure piece

A1 rotary axis

A2 rotation axis Rotary axis Rotary axis Rotary axis Rotary axis Rotary axis

Claims

claims

Rotary actuator (30) for a movable furniture part (3, 25, 25 '), with:

- One about an axis of rotation (31) pivotally mounted actuating arm (32);

a spring assembly (33) having at least one spring guided linearly in a direction of action,

- One with the spring assembly (33) connected to pressure piece (34, 34 ') which along a control cam (35, 35') is movable,

- A housing (21) on or in which the pivot drive is mounted, characterized in that the actuating arm (32) rotatably connected to the spring assembly (33) and with this about the rotation axis (31) is pivotable, wherein the actuating arm (32) is connected via a multi-joint connection with the movable furniture part and the control cam (35, 35 ') relative to the axis of rotation (31) for adjusting the spring force of the spring assembly (33) is adjustable and / or the force of the spring assembly (33) on the control cam adjustable is.

Rotary actuator according to claim 1, characterized in that the

Control cam (35, 35 ') via adjusting means is infinitely adjustable.

A pivot drive according to claim 1 or 2, characterized in that, on or in the housing (21), the control cam (35) is adjustably supported.

Rotary actuator according to one of the preceding claims, characterized in that the control cam (35, 35 ') is rotatably and / or displaceably mounted relative to the axis of rotation (31) of the actuating arm (32).

Rotary drive according to one of the preceding claims, characterized in that the control cam (35, 35 ') in the direction of action of the spring assembly (33) is adjustable and / or the spring assembly 33 is compressed or expanded by appropriate adjustment means in relation to the force on the control cam (35 , 35 ').

Rotary actuator according to one of the preceding claims, characterized in that the spring assembly (33) biases the actuating arm (32) in a closing area in a closing direction and in an opening area next to the closing area, the spring assembly (33) biases the actuating arm (32) in the opening direction.

7. Rotary actuator according to one of the preceding claims, characterized in that the actuating arm (32) is connected via a multi-joint connection with a flap (3) or a door.

8. Rotary actuator according to one of the preceding claims, characterized in that the control cam (35, 35 ') has a metal guide track.

9. Rotary actuator according to one of the preceding claims, characterized in that the movable furniture part is held at least over part of the opening area by the spring assembly (33) and the control cam (35, 41) in equilibrium.

10. Rotary actuator according to one of the preceding claims, characterized in that the pressure piece (34, 34 ') is designed as a roller, in particular made of metal.

1 1. Rotary actuator according to one of the preceding claims, characterized in that the spring assembly (30) comprises a plurality of juxtaposed springs which are linearly guided in the effective direction of the spring assembly.

12. Rotary actuator according to one of the preceding claims, characterized in that the pivot drive is designed as a flap fitting.

13. Rotary actuator according to one of the preceding claims, characterized in that the pivot drive has a damper for braking the actuating arm (32) in front of the closed position and / or the maximum opening position.

14. Rotary actuator according to one of the preceding claims, characterized in that the control cam (35) during an opening and / or closing movement of the movable furniture part relative to the housing (21) is immovable.

15. Rotary actuator according to one of the preceding claims, characterized in that the axis of rotation (31) about which the spring assembly (33) with the actuating arm (32) rotates, is arranged stationarily in the housing (21), such that the spring assembly (33) pivots about the axis of rotation (31) with the actuating arm (32).

16. Swivel drive according to one of the preceding claims, characterized

characterized in that a lever (37) of the multi-joint connection has two axes of rotation (A1, A3) for moving the movable furniture part and a further joint (40) or a cam guide (41) for indirect coupling with the actuating arm (32).

17. Rotary actuator according to claim 1 6, characterized in that the

Actuator (32) is connected by a hinge lever (36) with the lever (37) of the multi-joint connection.

18. Rotary actuator according to claim 1 6, characterized in that on the actuating arm (32) a pressure piece (45) is arranged, which cooperates with the cam guide of the lever (37).

19. Rotary actuator according to one of the preceding claims, characterized

characterized in that the total pivot angle of the spring assembly (33) about the axis of rotation (31) from the closed position to the fully open position of the movable furniture part is greater than 10 °.

20. Furniture (1) with a pivot drive (30) according to one of the preceding claims.

21. Furniture according to claim 20, characterized in that the pivot drive (30) in a side wall (10) of the furniture (1) is arranged.

22. Furniture according to claim 21, characterized in that the side wall (10) has a plate-shaped core (1 1) having a first end face and further end faces and wherein a recess (12) in the core (1 1) is arranged, at least extends along a portion of the first end side of the side wall and serves to receive a flap fitting (4), which guides a movable furniture part.

23. Furniture according to claim 22, characterized in that the plate-shaped core (1 1) of the side wall (10) between two laterally applied cover layers (13) is arranged.

24. Furniture according to claim 23, characterized in that the core (1 1) has two core halves, which lie with their respective cover layers (13) opposite side surfaces and to the recess (12) complementary recesses.

25. Furniture according to claim 20, characterized in that the pivot drive (30) on a side wall (10) of the furniture (1) is arranged.