EP3612701B1 - Pivoting drive - Google Patents

Description

The present invention relates to a swivel drive for a movable furniture part according to the preamble of claim 1 and claim 2 and a piece of furniture.

the DE 20 2010 015 091 U1 discloses a furniture fitting for driving a flap, in which a power drive with springs acts on a power deflection lever in order to preload a hinge drive in the opening or closing direction. To adjust the force, a coupling member can be adjusted on the reversing lever. The disadvantage here is that different spring forces and also a different spring force curve depending on the opening position of the flap are required for flaps of different widths and weights. The adjustment options for this furniture fitting are insufficient.

the 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 an adjusting contour which can be adjusted relative to the adjusting part in order to adjust the spring force. Such an actuator enables a compact design, but the setting options are limited because the adjusting contour is arranged between the pressure piece and the adjusting arm. This leads to unfavorable leverage ratios and problems when the contour of the control contour is required to be changed.

the WO 2004/104339 discloses a lid plate with two rotatably mounted arms, a spring element in one of the arms biasing a pressure piece against a curved guide so that a force is applied to the arms during a relative movement. The spring force can be adjusted using a rotatable eccentric. the EP 1 148 200 discloses a similar fitting as a flap holder.

WO 2016/131770 discloses a swivel drive according to the preamble of claim 1.

It is therefore the object of the present invention to create a swivel drive and a piece of furniture by means of which a force acting on an actuating arm can be flexibly adjusted for different positions of the actuating arm.

Furniture is understood to mean furnishings for a room, and the furnishings can also be household appliances such as a refrigerator.

This object is achieved with a swivel drive with the features of claim 1 or 2.

The swivel drive according to the invention comprises a rotatable actuating arm which is non-rotatably connected to a spring assembly and can be pivoted jointly with it about an axis of rotation, the spring assembly acting on a pressure piece which can be moved along a control curve which is relative to the rotational axis of the actuating arm for setting the The spring force of the spring assembly is adjustable. The actuating arm is connected to the movable furniture part via a multi-joint connection, with the force of the spring assembly on the control cam being adjustable in addition or as an alternative. As a result, the control cam and the axis of rotation for the actuating 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 the travel of the pressure piece along the control cam is not structurally limited. This results in favorable lever ratios and a simple structure, since the actuating arm is non-rotatably connected to the spring assembly and the control cam is adjusted relative to the fixed axis of rotation in order to adjust the spring force.

The control cam can preferably be adjusted continuously via adjusting means. This enables a precise setting of the spring forces acting on the actuating arm. The swivel drive can include 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 displaceably relative to the axis of rotation of the actuating arm in order to be able to carry out a flexible adjustment. If the control cam can be adjusted in the direction of action of the spring assembly, the magnitude of the force applied by the spring assembly can be changed. Alternatively, this is also possible by changing the preload of the spring assembly. If, on the other hand, the inclination of the control curve is changed, the force acting in a certain opening position of the actuating arm is set, which is particularly advantageous for flaps of different weights, since the center of gravity is shifted outward when opening a furniture body, and thus depends on the opening position different spring forces are required to compensate for the flap weight.

In a further embodiment, the spring assembly biases the actuating arm in a closing area in the closing direction, and in an opening area which is located adjacent to the closing area, the spring assembly biases the actuating arm in the opening direction. As a result, when the actuating arm opens, a dead center is passed through, and the direction of force acting on the actuating arm changes depending on the position of the actuating arm. With this arrangement, the spring assembly swivels in both directions of rotation during the opening movement.

In a further embodiment, the spring assembly biases the actuating arm in a closing area in the closing direction, and in an opening area which is located adjacent to the closing area, the spring assembly biases the actuating arm in the opening direction. The change in the direction of action of the spring is achieved by the shape of the control cam. At the beginning of an opening movement of the actuating arm, a section of the control curve is traversed during which the spring assembly is tensioned and in the further course of the opening movement the spring assembly is relaxed. With this arrangement, the spring assembly only swivels in one direction of rotation during the opening movement.

The actuating arm can be connected to a flap or door via the multi-joint connection. The pivot drive is preferably designed as a flap fitting in order to pivot a flap about a horizontal axis. But other purposes are also possible. The flap can thus perform the movement of a flap, a lid or a bar compartment. The multi-joint connection can be designed as a four-joint connection with two parallel levers or as a seven-joint connection, but other multi-joint connections can also be provided on the pivot drive.

In order to also be able to transmit high forces to the actuating arm via the spring assembly, the control cam preferably has a guide track made of metal. The pressure piece can also have a roller which has at least one surface made of metal and preferably consists entirely of metal, so that high forces can be transmitted between the pressure piece and the guideway.

For a flat design of the spring assembly, it can comprise a plurality of helical springs arranged next to one another, which are linearly guided in the effective direction of the spring assembly. Instead of a helical spring, cup springs or leaf springs or other compact springs can also be used as an alternative.

According to the invention, the control cam is immobile 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 in a stationary manner while the movable furniture part and the spring assembly move. The axis of rotation about which the spring assembly rotates with the actuating arm can be arranged in a stationary manner in the housing, so that the spring assembly with the actuating arm pivots about this axis of rotation.

In an embodiment of the multi-joint connection according to the invention, a lever has two axes of rotation for moving the movable furniture part and a further joint or a curved guide for indirect coupling with the actuating arm. For an effective power transmission, a pressure piece can be arranged on the actuating arm, which cooperates with the cam guide of the lever.

The total pivoting angle of the spring assembly about the axis of rotation from the closed position to the fully open position of the movable furniture part can be greater than 10 °, for example between 10 ° to 60 °.

The swivel drive can also include one or more dampers that brake the actuating arm before it reaches the closed position and / or a maximum open position. Such dampers can be attached as linear dampers, rotary dampers both within a multi-joint connection or also on the spring assembly.

The pivot drive according to the invention is preferably used in a piece of furniture, in particular to pivot a flap. The pivot drive is preferably 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 swivel drive can also be fixed on the inside of a furniture body, in which case the usable internal volume is reduced. If the pivot drive is provided in a side wall, the side wall can have a recess for receiving a housing of the pivot drive. The housing of the swivel drive then has an opening which is directed towards the front and which, when a flap is opened, enables one or more articulated arms to be moved out of the side wall or the housing of the swivel drive.

The side wall preferably has a plate-shaped core which has a first end face and further end faces, a recess being arranged in the core which extends at least along a section of the first end face of the side wall and serves to accommodate a flap fitting that guides a movable furniture part . The plate-shaped core of the side wall is preferably arranged between two laterally applied cover layers. The core can optionally have two core halves which lie on top of one another with their side faces opposite the respective cover layers and which have recesses that complement each other to form the recess. With such a side wall, the swivel drive is arranged on a side wall of the piece of furniture.

Figuren 1 bis 3

mehrere Ansichten von Möbel mit unterschiedlichen Klappenbeschlägen;

Figuren 4A bis 4H

mehrere Ansichten der Montage eines Möbels mit der Anordnung eines Schwenkantriebes in einer Seitenwand des Möbels;

Figur 5

eine perspektivische Ansicht eines modifizierten Möbels mit einem Schwenkantrieb in den Seitenwänden;

Figuren 6A bis 6G

mehrere Ansichten eines Schwenkantriebes in unterschiedlichen Positionen gemäß einem ersten Ausführungsbeispiel;

Figuren 7A bis 7D

mehrere Ansichten eines Schwenkantriebes in unterschiedlichen Positionen gemäß einem zweiten Ausführungsbeispiel;

Figuren 8A bis 8D

mehrere Ansichten eines Schwenkantriebes in unterschiedlichen Positionen gemäß einem dritten Ausführungsbeispiel;

Figuren 9A bis 9D

mehrere Ansichten eines Schwenkantriebes in unterschiedlichen Positionen gemäß einem vierten Ausführungsbeispiel, und

Figuren 10A bis 10C

mehrere Ansichten eines Schwenkantriebes in unterschiedlichen Positionen gemäß einem fünften Ausführungsbeispiel.

The invention is explained in more detail below on the basis of several exemplary embodiments with reference to the accompanying drawings. Show it:

Figures 1 to 3

several views of furniture with different flap fittings;

Figures 4A to 4H

several views of the assembly of a piece of furniture with the arrangement of a swivel drive in a side wall of the piece of furniture;

Figure 5

a perspective view of a modified piece of furniture with a swivel drive in the side walls;

Figures 6A to 6G

several views of a swivel drive in different positions according to a first embodiment;

Figures 7A to 7D

several views of a swivel drive in different positions according to a second embodiment;

Figures 8A to 8D

several views of a swivel drive in different positions according to a third embodiment;

Figures 9A through 9D

several views of a swivel drive in different positions according to a fourth embodiment, and

Figures 10A to 10C

several views of a swivel drive in different positions according to a fifth embodiment.

A piece of furniture 1 comprises a cabinet-shaped furniture body 2, with side walls 10, an upper floor 15 and a floor 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 upwards, as is shown schematically by the arrow. The flap fitting 4 is pretensioned via a pivot drive (not shown here), the spring force being dependent on the opening position of the flap 3.

In Figure 1 the flap fitting 4 is designed, for example, as a multi-joint connection, in particular as a seven-joint connection. It is also possible to design the flap fitting as a four-bar connection, as shown in FIG Figures 2 and 3 is shown. A flap 3 is pivotably mounted on the furniture body 2 and can be moved by two parallel levers 5 and 6, which is held on the levers 5 and 6 via a connection 7 or 7 '. at Figure 2 the flap 3 is pivoted essentially forwards and upwards, while at Figure 3 Levers 5 'and 6' are provided with a modified connection 7 ', by means of which the flap 3 can be pivoted at least partially over the top panel 15 along another curved path.

The flap fittings 4 according to Figures 1 to 3 can optionally be fixed on an inside of the side walls 10 or also in the side walls 10.

In order to provide a fitting in a side wall 10, reference is made to FIG Figures 4A to 4H a corresponding assembly process is described. A side wall 10 comprises an inner core 11, for example made of an MDF or HDF or lightweight board, in which a recess 12 is made, for example by milling. The core 11 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 only open on a front end face.

As in Figure 4C is shown, a fitting 20 with a housing 21 can be inserted into the recess 12. The housing 21 comprises a width which corresponds to the width of the core 11 and can for example be between 12 mm and 22 mm, in particular 12 mm to 17 mm. The housing 21 can also be narrower than the width of the core if the housing 21 is inserted into the side in a different way. 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 on the housing 21. In the illustrated embodiment, the lower arm 22 is rotatably mounted on an axis of rotation 23 of the housing 21. Furthermore, an upper arm 24 is arranged at a distance from the lower arm 22 and is provided via a hollow chamber of the housing 21 arranged in a receptacle 27.

In Figure 4D the side walls are shown without cover layers 13, and it can be seen that the fitting 20 with the housing is inserted essentially positively into the recess 12 of the core 11. On the fitting 20, flap parts 25 and 26 are mounted on the arms 22 and 24, an upper flap part 25 and a lower flap part 26 being held on the arm 24 and a lower flap part 26 being held on the lower arm 22, and the two flap parts 25 and 26 with one another via an articulated connection are connected, the flap formed from the flap parts 25 and 26 folds open when opened.

In the Figures 4E and 4F two positions of the furniture 1 are shown, the side walls 10 being 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 forward from the housing 21 of the fitting.

In the Figures 4G and 4H the piece of furniture is shown with the fitting 20 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 piece of furniture is shown in which a furniture body has several adjacent interior spaces, and one or more central partitions are provided between the two outer side walls. A fitting 20 is also provided on each central partition wall, so that a flap with flap parts 25 'and 26' is made significantly wider than in the previous exemplary embodiment. The flap parts 25 'and 26' are held by several 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 shown schematically with an embodiment of a swivel 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 axes of rotation A1 and A2 which are stationary on the housing 21 and which form an articulated connection via joints with five further axes of rotation A3 to A7, to which the flap 3 is fixed at a connection 38. Such multi-joint connections are known in different variants and are therefore only shown schematically.

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

The actuating arm 32 is non-rotatably connected to a spring assembly 33, which comprises one or more springs that are linearly movable and can be compressed and expanded on a linear guide, for example by rods, sleeves or other linear guide elements. The spring assembly 33 is mounted on one side on an axis of rotation 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 designed as a roller, in particular made of metal, and can be moved along a control curve 35. The control cam 35 is adjustable in the housing 21 and is preferably also made 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 initially be compressed or expanded in the effective direction of the spring assembly 33, that is, in the direction of a line between the axis of rotation 31 and an axis of the pressure piece 34, in that the control cam 35 is adjusted accordingly. For this purpose, corresponding adjustment means, in particular thread adjustments, eccentrics or worms, can be provided on the control cam, which are supported on the housing 21 and, in this respect, enable the control cam 35 to be adjusted. In order to produce the same effect, it is also possible to compress or expand the spring assembly 33 by means of appropriate adjustment means, in particular thread adjustments, eccentrics or screws.

In addition to the linear adjustment, the control cam 35 can also be pivotable, preferably about a pivot point which, in a closed position of the fitting, is adjacent to the pressure piece 34. As a result, the force acting on the actuating arm 32 through the spring assembly 33 can be set for different opening positions of the flap 3 without the control cam 35 having to be replaced. Since, with flaps of different widths, depending on the opening position, different weights act on the actuating arm 32, the spring force for different opening positions can be changed by such a pivot adjustment. The pivot drive 30 according to the invention preferably comprises both a linear adjustment and a pivot adjustment for the control cam 35, with further adjustment options being optionally also possible, for example individual sections of the control cam 35 can be adjusted relative to one another.

In Figure 6A the closed position of the flap 3 is shown, in which it essentially vertically covers an opening on the furniture body 2. If the flap 3 is pivoted in the opening direction, like this Figure 6B shows, the multi-joint arrangement moves with the lever 37 about the axis of rotation A1 counterclockwise, and a compressive force is transmitted to the joint lever 36, whereby the actuating arm 32 is rotated clockwise through the axis of rotation 31. As a result, the pressure piece 34 also moves clockwise along the control curve, which is curved towards the spring assembly 33, so that when the spring assembly 33 moves clockwise, the pressure piece 34 is pressed against the spring assembly 33, so that when the flap 3 is opened the Forces act in the closing direction and must be overcome by the user when opening the flap 3. The flap 3 is according to Figure 6C moved further in the opening direction, and in a predetermined opening position, for example at an angle of the flap 3 between 20 ° to 30 ° to the closed position, a dead center is passed through. In the area of the dead center, the joint 40 is on a line which runs through the axis of rotation A1 and the joint lever 36. The pressure piece 34 was moved to a maximum position along the control cam 35. If the flap 3 is removed from the in Figure 6C The dead center position shown is moved further in the opening direction, as shown in FIG Figure 6D is shown, by turning the double lever 37 counterclockwise, the articulated lever 36 is pulled over the articulation 40, so that the actuating arm 32 is now rotated counterclockwise about the axis of rotation 31. 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 according to the illustration of Figures 6E , 6F and 6G be moved further in the opening direction, for example up to a maximum opening position of 100 ° to 120 ° relative to the closed position. During this rotary movement, the actuating arm 32 is pivoted counterclockwise, and the pressure piece 34 accordingly moves along the control cam 35, which is designed such that the spring assembly 33 relaxes during this rotary movement. As a result, the weight applied to the fitting by the flap 3 is at least partially compensated for by the spring assembly 33, whereby it is possible to adjust the spring assembly 33 with the actuating arm 32 so that the weight of the flap 3 is completely compensated and the user essentially only the forces to move the flap 3 must apply. The forces of the spring assembly 33 can also be adjusted so that the flap opens automatically from a certain opening angle. The control cam can also be designed, independently of the spring assembly 33, in such a way that the flap opens automatically from a certain opening angle.

The flap 3 is positively guided relative to the pivot drive 30, so that the opposing movements are carried out during a closing movement. First of all, when closing from the in Figure 6G position shown up to the in Figure 6C Forces shown in the position shown by the user are used to compress the spring assembly 33 again, which is pivoted about the axis of rotation 31 and is compressed via the pressure piece 34 and the control cam 35. When the dead center is reached, no more force is transmitted to the actuating arm 32 via the spring assembly 33, and the spring assembly 33 then acts in the closing direction only when there is a further closing movement. The flap 3 can be pre-tensioned in a closing area of, for example, 0 ° to 20 ° or 0 ° to 30 ° in the closing direction via the pivot drive 30 and is pre-tensioned in an opening area adjacent to this closing area via the pivot drive 30 in the opening direction.

Optionally, the swivel drive 30 can have a damper, for example a linear damper, which ensures that the flap 3 is braked before it reaches the closed position and / or the maximum open position, so that no loud impact noises occur. Such a damper can for example on the spring assembly 33 or the actuating arm 32 or on the housing 21 in order to dampen the pivoting movement of the spring assembly.

In the following exemplary embodiments, further swivel drives are shown, the same components having the same reference numerals as in the exemplary embodiment in FIG Figure 6 are designated. Therefore, only the differences to the one in Figure 6 The embodiment shown has been received in detail.

The in Figures 7A to 7D In the illustrated embodiment, the spring assembly 33 in the closed position of the flap 3 is no longer arranged with the effective direction essentially vertically, but rather at an angle. 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 adjustment mechanism from a front side of the furniture body. Otherwise, as in the previous exemplary embodiment, the actuating arm 32 is coupled via an articulated lever 36 to the multi-articulated connection on which the flap 3 is also held. Otherwise, the mode of operation of the swivel drive with the spring assembly 33, which acts on the pressure piece 34, which can be moved along the control cam 35, is the same as in the previous exemplary embodiments.

In the Figures 8A to 8D Another exemplary embodiment of a swivel drive is shown, in which the actuating arm 32 is again connected to the flap 3 via an articulated lever 36 with a multi-articulated connection. The spring package 33 is arranged rotated in the housing 21 of the fitting 20 compared to the other exemplary embodiments, the pressure piece 34 and the control cam 35 being arranged facing the rear of the furniture body. The axis of rotation 31 of the actuating arm 32, on the other hand, is located adjacent to the flap 3.

In the Figures 9A through 9D Another embodiment of a swivel fitting is shown in which a modified control cam 35 'is provided, which is used to guide a modified pressure piece 34'. The control cam 35 'is designed as a linear guide which is inclined to the direction of action of the spring assembly 33, so that when the pressure piece 34' is moved relative to the control cam 35 ', the spring assembly 33 is relaxed or tensioned.

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

In addition, the swivel drive 30 in the in Figures 9A through 9D The embodiment shown is not coupled via a joint 40, but a further pressure piece 45 is provided on the actuating arm 32, for example a roller which can be moved along a curved guide 41. The cam guide 41 is non-rotatably connected to a lever 37 of the multi-joint arrangement, and by rotating the cam guide 41 about the axis of rotation A1, the pressure piece 45 and thus the actuating arm 32 are pivoted. When the flap 3 is opened, the cam guide 41 pivots counterclockwise, and the actuating arm 32 also pivots counterclockwise as a result.

In the Figures 10A to 10C Another exemplary embodiment is shown 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 can again be moved along a curved guide 41 which is pivoted counterclockwise when the flap is opened. The position of the spring assembly 33 and the dimensions are compared to that in Figure 9 shown embodiment different.

The illustrated exemplary embodiments can be combined with one another as desired in order to modify the transmission mechanism from the flap 3 or another movable furniture part to the control cam 35 or 35 '.

List of reference symbols

1

Furniture

2

Furniture body

3

flap

4th

Flap fitting

5, 5 '

lever

6, 6 '

lever

7, 7 '

Connection

10

Side wall

11th

core

12th

Recess

13th

Top layer

14th

floor

15th

Topsoil

20th

fitting

21

casing

22nd

poor

23

Axis of rotation

24

poor

25.25 '

Flap part

26, 26 '

Flap part

27

admission

30th

Slewing drive

31

Axis of rotation

32

Control arm

33

Spring package

34.34 '

Pressure piece

35.35 '

Control curve

36

Articulated lever

37

Lever / double lever

38

Connection

39

joint

40

joint

41

Cornering

45

Pressure piece

A1

Axis of rotation

A2

Axis of rotation

A3

Axis of rotation

A4

Axis of rotation

A5

Axis of rotation

A6

Axis of rotation

A7

Axis of rotation

Claims (22)

1. Pivot drive (30) for a movable furniture part (3, 25, 25'), having:

   - an actuating arm (32) mounted so as to be pivotable about an axis of rotation (31);

   - a spring assembly (33) having at least one spring guided linearly in one operating direction,

   - a pressure-exerting component (34, 34') connected to the spring assembly (33) and movable along a control curve (35, 35') of the pivot drive (30),

   - 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 is pivotable therewith about the axis of rotation (31), wherein the actuating arm (32) is connected to the movable furniture part via a multi-joint connection of the pivot drive (30) and the control curve (35, 35') is adjustable relative to the axis of rotation (31) for adjusting the spring force of the spring assembly (33) and/or the force action of the spring assembly (33) on the control curve is adjustable, wherein a lever (37) of the multi-joint connection has two axes of rotation (A1, A3) for moving the movable furniture part and the actuating arm (32) is connected to the lever (37) of the multi-joint connection by a joint lever (36) and a joint (40), characterized in that the control curve (35) is immovable relative to the housing (21) during an opening and/or closing movement of the movable furniture part (3, 25, 25') so that a furniture body, the control curve and the housing (21) are stationary while the movable furniture part (3, 25, 25') and the spring assembly (33) are moving.
2. Pivot drive (30) for a movable furniture part (3, 25, 25'), having:

   - an actuating arm (32) mounted so as to be pivotable about an axis of rotation (31);

   - a spring assembly (33) having at least one spring guided linearly in one operating direction,

   - a pressure-exerting component (34, 34') connected to the spring assembly (33) and movable along a control curve (35, 35') of the pivot drive (30),

   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 is pivotable therewith about the axis of rotation (31), wherein the actuating arm (32) is connectable to the movable furniture part via a four-joint with two parallel levers or as seven joint connection as multi-joint connection of the pivot drive (30) and the control curve (35') is adjustable relative to the axis of rotation (31) for adjusting the spring force of the spring assembly (33) and/or the force action of the spring assembly (33) on the control curve is adjustable, wherein a lever (37) of the multi-joint connection has a curve guide (41) for indirect coupling to the actuating arm (32), characterized in that the control curve (35) is immovable relative to the housing (21) during an opening and/or closing movement of the movable furniture part (3, 25, 25') so that the control curve (35') and the housing (21) are stationary while the movable furniture part (3, 25, 25') and the spring assembly (33) are moving.
3. Pivot drive according to claim 1 or 2, characterized in that the control curve (35, 35') is infinitely variable via actuating means.
4. Pivot drive according to claim 1 or 2, characterized in that the control curve (35) is held adjustably on or in the housing (21).
5. Pivot drive according to one of the preceding claims, characterized in that the control curve (35, 35') is mounted rotatably and/or displaceably relative to the axis of rotation (31) of the actuating arm (32).
6. Pivot drive according to one of the preceding claims, characterized in that the control curve (35, 35') is adjustable in the direction of action of the spring assembly (33) and/or the spring assembly (33) is compressed or expanded by corresponding adjusting means in relation to the force action on the control curve (35, 35').
7. Pivot drive according to one of the preceding claims, characterized in that the spring assembly (33) pretensions the actuating arm (32) in a closing region in a closing direction and in an opening region next to the closing region the spring assembly (33) pretensions the actuating arm (32) in the opening direction.
8. Pivot drive according to one of the preceding claims, characterized in that the actuating arm (32) is connected to a flap (3) or a door via a multi-joint connection.
9. Pivot drive according to one of the preceding claims, characterized in that the control curve (35, 35') has a guide track consisting of metal.
10. Pivot drive according to one of the preceding claims, characterized in that the movable furniture part is kept in balance at least over part of the opening region by the spring assembly (33) and the control curve (35, 41).
11. Pivot drive according to one of the preceding claims, characterized in that the pressure-exerting component (34, 34') is designed as a roller, in particular made of metal.
12. Pivot drive according to one of the preceding claims, characterized in that the spring assembly (30) comprises a plurality of springs which are arranged next to one another and which are guided linearly in the direction of action of the spring assembly.
13. Pivot drive according to one of the preceding claims, characterized in that the pivot drive is designed as a flap fitting.
14. Pivot drive according to one of the preceding claims, characterized in that the pivot drive has a damper for braking the actuating arm (32) before the closed position and/or the maximum opening position.
15. Pivot drive according to one of the preceding claims, characterized in that the axis of rotation (31) about which the spring assembly (33) rotates with the actuating arm (32) is arranged in a fixed manner in the housing (21), so that the spring assembly (33) with the actuating arm (32) pivots about the axis of rotation (31).
16. Pivot drive according to claim 2, characterized in that a pressure-exerting component (45) is arranged on the actuating arm (32) and cooperates with the curve guide of the lever (37).
17. Pivot drive according to one of the preceding claims, characterized in that the total pivot angle of the spring assembly (33) about the axis of rotation (31) from the closed position into the fully open position of the movable furniture part is greater than 10°.
18. Piece of furniture (1) having a pivot drive (30) according to one of the preceding claims.
19. Piece of furniture according to claim 18, characterized in that the pivot drive (30) is arranged in a side wall (10) of the piece of furniture (1).
20. Piece of furniture according to claim 19, characterized in that the side wall (10) has a plate-shaped core (11) which has a first end face and further end faces, and wherein a recess (12) is arranged in the core (11), which recess extends at least along a section of the first end face of the side wall and serves to receive a flap fitting (4) which guides a movable furniture part.
21. Piece of furniture according to claim 20, characterized in that the plate-shaped core (11) of the side wall (10) is arranged between two laterally applied cover layers (13).
22. Piece of furniture according to claim 21, characterized in that the core (11) has two core halves which lie one on top of the other with their side faces opposite the respective cover layers (13) and have recesses which complement one another to form the recess (12).

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