Furniture drive system for a movable furniture part

Abstract

A furniture drive system includes: a support for mounting the system on a furniture carcass; an actuating arm device movably mounted on the support and to be connected to the movable furniture part; an electric motor to be connected to the actuating arm device to move sections of the actuating arm device; a drive device separate from the electric motor for exerting a force on the actuating arm device; an adjusting device for adjusting the force to be exerted by the drive device; and a control device for controlling the electric motor. The control device has a determining device for determining the force to be exerted on the actuating arm device, and the drive device has a damping device to dampen a closing movement and/or an opening movement of the actuating arm device. The determining device is designed to perform a damper analysis of the damping device.

Claims

1. A furniture drive system for a movable furniture part, comprising: a support configured to fit the furniture drive system on a furniture carcass, an actuating arm device movably mounted on the support and configured to be connected to the movable furniture part, an electric motor connected to the actuating arm device and configured to move the actuating arm device, a drive device separate from the electric motor and configured to exert a force on the actuating arm device, a setting device configured to set the force to be exerted on the actuating arm device by the drive device, and a control device configured to control the electric motor, wherein the control device has a determining device for determining the force to be exerted on the actuating arm device by the drive device, wherein the drive device has a damping device configured to damp at least one of a closing movement and an opening movement of the actuating arm device, and wherein the determining device is configured to carry out a damper check of the damping device, the damper check comprising obtaining a reference movement of the actuating arm device, the reference movement including a parameter determined and compared with a reference value or a reference value progression.

2. The furniture drive system according to claim 1, wherein the drive device includes an energy storage mechanism, the energy storage mechanism having a first end engaging the support and having a second end engaging the actuating arm device.

3. The furniture drive system according to claim 2, wherein the energy storage mechanism comprises a spring assembly, and the second end of the energy storage mechanism indirectly engages the actuating arm device.

4. The furniture drive system according to claim 1, wherein the determining device includes a sensor configured to measure a power consumption of the electric motor.

5. The furniture drive system according to claim 4, wherein the control device is configured to compare a value of the power consumption of the electric motor measured with a reference value or reference value progression of the power consumption, and is further configured to emit a deviation signal if a deviation of the measured power consumption from the reference value or from the reference value progression is determined.

6. The furniture drive system according to claim 5, wherein the control device is configured to display a visual indication signal on the furniture drive system depending on the emitted deviation signal.

7. The furniture drive system according to claim 6, wherein the control device is configured to display the visual indication signal on a cover of the furniture drive system.

8. The furniture drive system according to claim 5, wherein the drive device includes an energy storage mechanism and the setting device includes an energy storage mechanism setting unit configured to, when the deviation signal is emitted, set a force from the energy storage mechanism acting on the actuating arm device.

9. The furniture drive system according to claim 5, wherein the control device is configured to determine the reference value or the reference value progression of the power consumption in the reference movement, and is further configured to emit the deviation signal if the deviation of the measured power consumption from the reference value or from the reference value progression lies above a defined threshold value.

10. The furniture drive system according to claim 1, wherein the determining device includes an angle sensor configured to measure an angular position of the actuating arm device.

11. The furniture drive system according to claim 10, wherein the control device, is configured to determine a speed of the actuating arm device in a movement portion in at least one of a position directly before the closed position when the actuating arm device is moving in a closing direction and a position directly before the open position when the actuating arm device is moving in an opening direction based on the angular position measured by the angle sensor at different points in time.

12. The furniture drive system according to claim 11, wherein the control device is configured to compare the speed determined via the angle sensor with a reference value or reference value progression of the speed, and is further configured to emit a deviation signal if a deviation of the measured speed from the reference value or from the reference value progression is determined.

13. The furniture drive system according to claim 12, wherein the control device is configured to display a visual indication signal on the furniture drive system depending on the emitted deviation signal.

14. The furniture drive system according to claim 13, wherein the control device is configured to display the visual indication signal on a cover of the furniture drive system.

15. The furniture drive system according to claim 12, wherein the setting device includes a damper setting unit configured to, when the deviation signal is emitted, set at least one of the damping force and a damping starting position in relation to an angular position of the actuating arm device relative to at least one of the support and a damping path.

16. The furniture drive system according to claim 12, wherein the control device is configured to compare the speed determined via the angle sensor with a reference value or reference value progression of the speed determined in the reference movement, and is further configured to emit the deviation signal if the deviation of the measured speed from the reference value or from the reference value progression lies above a defined threshold value.

17. The furniture drive system according to claim 1, wherein the actuating arm device and the drive device are part of a mechanical actuating unit, and the electric motor is part of an electric drive unit implemented as an assembly formed separately from the mechanical actuating unit and having a driver, the driver being configured to be driven by the electric motor to transmit a torque of the electric motor to the actuating arm device of the mechanical actuating unit.

18. The furniture drive system according to claim 17, wherein the electric drive unit includes a gear mechanism between the electric motor and the driver.

19. The furniture drive system according to claim 18, wherein the gear mechanism comprises at least two gear stages and at least one of a freewheel clutch and an overload clutch.

20. The furniture drive system according to claim 1, wherein the drive device includes an energy storage mechanism configured to exert the force on the actuating arm device, the furniture drive system further comprising a transmission mechanism configured to transmit the force of the energy storage mechanism to the actuating arm device.

21. The furniture drive system according to claim 20, wherein the transmission mechanism includes a control cam and a pressure roller loaded by the energy storage mechanism, the pressure roller being configured to move along the control cam during a movement of the actuating arm device.

22. The furniture drive system according to claim 20, wherein the actuating arm device includes a movably mounted actuator configured to assist in the transmission of a force from the energy storage mechanism to the actuating arm device.

23. The furniture drive system according to claim 22, wherein the movably mounted actuator has a transmission opening to allow engagement with a driver driven by the electric motor.

24. The furniture drive system according to claim 1, wherein the drive device includes an energy storage mechanism configured to perform at least one of: compensate for a weight force of the actuating arm device and of the furniture part to be connected to the actuating arm device, move the actuating arm device in a direction of a fully closed position, and move the actuating arm device in a direction of a fully open position.

25. A piece of furniture comprising: a furniture carcass, a furniture part movable relative to the furniture carcass, and the furniture drive system according to claim 1.

26. The piece of furniture according to claim 25, wherein the furniture part is mounted to be movable about a horizontal axis, and the furniture part is one of a bi-fold lift flap, a lift up flap, or an up and over lift flap.

27. The furniture drive system according to claim 1, wherein the actuating arm device is rotatably mounted on the support.

28. A method for operating a furniture drive system, the furniture drive system includes: a support configured to fit the furniture drive system on a furniture carcass, an actuating arm device movably mounted on the support and configured to be connected to the movable furniture part, an electric motor connected to the actuating arm device and configured to move the actuating arm device, a drive device separate from the electric motor and configured to exert a force on the actuating arm device, a damping device configured to damp at least one of a closing movement and an opening movement of the actuating arm device, a setting device configured to set the force to be exerted on the actuating arm device by the drive device, and a control device configured to control the electric motor, the method comprising: determining the force to be exerted on the actuating arm device by the drive device using a determining device of the control device, the determining device being configured to carry out a damper check of the damping device, the damper check comprising obtaining a reference movement of the actuating arm device, the reference movement including a parameter determined and compared with a reference value or a reference value progression.

29. The method according to claim 28, further comprising: measuring a power consumption of the electric motor via a sensor, comparing the measured power consumption with a reference value or reference value progression, and emitting a deviation signal if a deviation of the measured power consumption from the reference value or from the reference value progression is detected.

30. The method according to claim 29, further comprising setting or adjusting the force from an energy storage mechanism of the drive device acting on the actuating arm device via an energy storage mechanism setting unit of the setting device when the deviation signal is emitted.

31. The method according to claim 29, wherein the comparing of the measured power consumption with the reference value or reference value progression is determined in the reference movement, and the emitting of the deviation signal is perform if the deviation of the measured power consumption from the reference value or from the reference value progression lies above a defined threshold value.

32. The method according to claim 28, further comprising: determining a speed of the actuating arm device in a movement portion in at least one of a position directly before a closed position when the actuating arm device is moving in a closing direction and directly before an open position when the actuating arm device is moving in an opening direction based on values measured by an angle sensor at different points in time, comparing the speed determined via the angle sensor with a reference value or reference value progression, and emitting a deviation signal if a deviation of the measured speed from the reference value or from the reference value progression is determined.

33. The method according to claim 32, further comprising setting or adjusting at least one of: a damping force, a damping starting position in relation to an angular position of the actuating arm device relative to the support, and a damping path of a damping device of the drive device via a damper setting unit of the setting device when a deviation signal is emitted.

34. The method according to claim 32, wherein the speed determined via the angle sensor is compared with a reference value or reference value progression determined in a reference movement, and wherein the deviation signal is emitted when the deviation of the measured speed from the reference value or from the reference value progression lies above a defined threshold value.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further details and advantages of the present invention are explained in more detail below with reference to the drawings, in which:

(2) FIG. 1, schematically shows a piece of furniture with a furniture drive system for a furniture flap,

(3) FIG. 2a is a view of a mechanical actuating unit with an actuating arm device and an energy storage mechanism,

(4) FIG. 2b shows a detail from FIG. 2a,

(5) FIGS. 3a+3b are perspective representations of the mechanical actuating unit,

(6) FIGS. 4a+4b are longitudinal sections through the mechanical actuating unit in an intermediate open position,

(7) FIGS. 5a+5b show details relating to FIGS. 4a and 4b,

(8) FIGS. 6a+6b are longitudinal sections through the mechanical actuating unit in a furniture part position upstream of the maximum open position, wherein in each case the damping starting position is given,

(9) FIGS. 7a+7b are longitudinal sections through the mechanical actuating unit in a furniture part position upstream of the closed position, wherein in each case the damping starting position is given,

(10) FIG. 8, is a perspective view of the piece of furniture with open bi-fold lift flap,

(11) FIG. 9, is a perspective view of the furniture carcass with furniture drive systems arranged on both sides,

(12) FIG. 10, is a perspective view of the furniture drive system with a protective faceplate,

(13) FIG. 11, is perspective view of the furniture drive system without protective faceplate, with a view onto the cover,

(14) FIG. 12, is a perspective view of the mechanical actuating unit and the electric drive unit,

(15) FIG. 13 shows a different perspective from FIG. 12,

(16) FIG. 14, is a perspective view of the electric drive unit,

(17) FIG. 15 shows a different perspective from FIG. 14, and

(18) FIG. 16, is a perspective view of details of the electric drive unit with all the relevant component parts.

DETAILED DESCRIPTION OF THE INVENTION

(19) FIG. 1 shows a piece of furniture 100 with a furniture carcass 3, wherein a furniture drive system 1 (furniture fitting) for moving a movably mounted furniture part 2 is fastened to a side wall 3a of the furniture carcass 3.

(20) In the embodiment shown, the movable furniture part 2 has two furniture flaps 2a, 2b, wherein a first furniture flap 2a is connected, pivotable about a horizontally running axis of rotation, to the furniture carcass 3 via at least two hinges 9a and the second furniture flap 2b is connected, pivotable about a horizontally running axis of rotation, to the first furniture flap 2a via at least two hinges 9b.

(21) The furniture drive system 1 has a support 4 to be fastened to the furniture carcass 3, preferably to the side wall 3a of the furniture carcass 3, and at least one actuating arm 52, which is pivotable relative to the support 4 and is connected to the movable furniture part 2, preferably to the second furniture flap 2b.

(22) It can be recognized that the piece of furniture 100 is arranged spaced apart from the ceiling 10 in FIG. 1. In FIG. 1 the actuating arm 52 encloses a relatively large pivot angle, which corresponds to the maximum open position OS of the movable furniture part 2.

(23) FIG. 2a shows the mechanical actuating unit 1.1 of the furniture drive system 1 in a side view, wherein the mechanical actuating unit 1.1 has a support 4 to be fastened to the furniture carcass 3 and at least one actuating arm 52 which is mounted on the support 4, pivotable about a pivot pin X.

(24) In the embodiment shown, an actuating arm extension 11 is releasably arranged on the actuating arm 52, wherein the actuating arm extension 11 has two actuating arm parts 11a, 11b that are displaceable relative to each other. It is preferably provided that the actuating arm parts 11a, 11b are telescopically displaceable relative to each other, wherein the first actuating arm part 11a can be releasably connected to the actuating arm 52. The second actuating arm part 11b has a fastening device 12, which can be releasably connected to a fitting part to be fastened to the movable furniture part 2, preferably can be locked and unlocked toollessly.

(25) To apply force to the actuating arm 52 of the actuating arm device 5, an energy storage mechanism 6 is provided, which can have, for example, at least one helical spring, preferably at least one compression spring. Alternatively, the energy storage mechanism 6 can also have other energy storage mechanisms, such as for example a fluid storage mechanism in the form of a gas spring.

(26) The actuating arm device 5 has a transmission mechanism 51 for transmitting a force of the energy storage mechanism 6 to the at least one actuating arm 52. It is preferably provided that the transmission mechanism 51 has a control cam 53 and a pressure roller 54 loaded by the energy storage mechanism 6, wherein the pressure roller 54 can be moved along the control cam 53 during a movement of the at least one actuating arm 52.

(27) According to a preferred embodiment, the control cam 53 can be arranged or formed on the actuating arm 52. Of course, it is also possible to arrange the control cam 53 at a different place in the transmission mechanism 51 of the actuating arm device 5.

(28) In the case represented in FIG. 2b the actuating arm 52 is formed in one piece with an actuator 55 for the transmission of a force from the energy storage mechanism 6 to the actuating arm 52. The control cam 53 is formed on this actuator 55. In addition, the transmission opening 59, in which the driver 31 that is drivable by the electric motor 30 engages or can engage, is formed in this actuator 58.

(29) A force of the energy storage mechanism 6 onto the at least one actuating arm 52 can be set by an energy storage mechanism setting unit 14. It is preferably provided that the energy storage mechanism setting unit 14 has at least one rotatably mounted setting wheel 14a, wherein a force of the energy storage mechanism 6 onto the actuating arm 52 acting on the at least one actuating arm 52 can be set by a rotation of the setting wheel 14a, and/or the energy storage mechanism setting unit 14 has at least one threaded spindle 16, along which a point of application 15 of the energy storage mechanism 6 is movable when the energy storage mechanism setting unit 14 is actuated and/or the support 4 has a front face with at least one opening 17a, through which the at least one actuating arm 52 protrudes in an open position, wherein a setting wheel 14a of the energy storage mechanism setting unit 14 can be actuated through the opening 17a from a direction transverse to the front face.

(30) FIG. 2b shows the region circled in FIG. 2a in an enlarged view. The transmission mechanism 51 has an intermediate lever 19, which is mounted on the support 4, pivotable about a pivot pin 19a. The threaded spindle 16 is mounted on the intermediate lever 19. Through a rotation of the setting wheel 14a of the energy storage mechanism setting unit 14 by a tool, the threaded spindle 16 can be rotated, as a result of which the point of application 15 of the energy storage mechanism 6 moves along the threaded spindle 16. In this way, the relative distance between the point of application 15 and the pivot pin 19a of the intermediate lever 19, and thus the torque of the energy storage mechanism 6 acting on the actuating arm 52, can be increased and decreased.

(31) The mechanical actuating unit 1.1 furthermore comprises at least one damping device 7 for damping a movement of the at least one actuating arm 52 of the actuating arm device 5. This damping device 7 forms, together with the energy storage mechanism 6, the drive device A, with which a force can be exerted on the actuating arm device 5.

(32) It is preferably provided for the damping device 7 that it is formed as a fluid damper and/or has at least one piston-cylinder unit and/or can be acted on by the at least one actuating arm 52 during a closing movement and/or can be acted on from the same side both during an opening movement O and during a closing movement S of the at least one actuating arm 52.

(33) FIG. 3a shows the mechanical actuating unit 1.1 in a perspective view, wherein a force of the energy storage mechanism 6 can be transmitted to the at least one actuating arm 52 by the transmission mechanism 51 of the actuating arm device 5. The energy storage mechanism setting unit 14 can, for example, comprise a rotatable setting wheel 14a, wherein the point of application 15 of the energy storage mechanism 6 along the threaded spindle 16 can be set through a rotation of the setting wheel 14a and the torque acting on the actuating arm 52 can thus be set.

(34) The mechanical actuating unit 1.1 can additionally have an installation safety device 20 for the empty actuating arm 52, thus on which a movable furniture part 2 has not yet been fitted, for limiting an opening speed of the empty actuating arm 52, wherein the installation safety device 20 prevents the empty actuating arm 52 from being unintentionally opened or swung out by a force of the energy storage mechanism 6. It is preferably provided that the installation safety device 20 comprises at least one centrifugal clutch 20a.

(35) FIG. 3b shows the mechanical actuating unit 1.1 in a further (slightly offset) perspective view. The entire damping device 7 can be easily recognized in this representation. This damping device 7 contains the damper housing 71 and the damper piston 72.

(36) The damping device 7 is adjustable relative to the support 4 via the damper setting unit 8. The damper setting unit 8 contains the setting device 8a (in the form of a switch) and the setting axle pin 8x. The setting axle pin 8x is fixedly connected to the support 4.

(37) In FIG. 3b the setting device 8a is pivoted towards the right, as a result of which the damping device 7 is located in a maximum right-hand position relative to the support 4.

(38) In FIG. 3b it can be seen that a first damping transmission element 5a is formed on the actuating arm 52. This first damping transmission element 5a is formed in the shape of an extension, which faces the damping device 7. In the position represented in FIG. 3b, the stop 55 is (still) spaced apart from the stop counterpiece 74 formed on the damper housing 71.

(39) A stop element 56 (in the form of a roller) is arranged on the actuating arm device 5. This stop element 56 is (still) spaced apart from the second damping transmission element 5b, which is mounted on the support 4, pivotable via the axle pin 57.

(40) FIGS. 4a to 7b in each case show a vertical longitudinal section through the mechanical actuating unit 1.1 in different positions.

(41) In FIGS. 4a and 4b the actuating arm device 5 is located in the same open position. This corresponds to an approximately half-open movable furniture part 2. The opening angle of the actuating arm 52 lies somewhere in the range between 55 and 80.

(42) However, FIGS. 4a and 4b differ in that the damping device 7 is located in different positions. In FIG. 4b the damping device 7 is located in its maximum right-hand position. As can be seen in the associated enlarged representation according to FIG. 5b, the setting device 8a is rotated towards the right about the setting axle pin 8x. As a result, a relatively broad region of the setting device 8a is located between the damper housing 71 and the setting axle pin 8x.

(43) In contrast, in FIG. 4a and in the associated FIG. 5a the setting device 8a of the damper setting unit 8 is rotated 90 towards the left. As a result, a relatively narrow region of the setting device 8a is located between the damper housing 71 and the setting axle pin 8x. The damping device 7 is located in its maximum left-hand position.

(44) In all positions according to FIGS. 4a to 5b, the damping device 7 is unloaded and thus pressure-relieved and in the fully extended position. The second damping transmission element 5b rests against the damping piston 72.

(45) In the comparison between FIGS. 5a and 5b it can be recognized that, in addition to a translational displacement movement relative to the support 4, the damper housing 71 has also carried out a (slight) pivoting movement relative to the support 4.

(46) In FIGS. 6a and 6bstarting from the previous FIGS. 4a to 5ban opening movement O of the actuating arm device 5 has been carried out. As a result, the actuating arm 52 has been pivoted upwards. This opening movement O was carried out until the stop 55 of the first damping transmission element 5a contacted the stop counterpiece 74. In this position, the damping starting position D is reached in each case.

(47) As the damping devices 7 are located in different maximum positions in FIGS. 6a and 6b, the actuating arm 52 adopts a different angular position in the case of the respectively given damping starting position D. Specifically, there is an opening angle of approximately 108 in FIG. 6a, whereas there is an opening angle of 100 in FIG. 6b.

(48) If the opening movement O is continued from this respective damping starting position D, the damper piston 72 is pushed into the damper housing 71 via the stop counterpiece 74, as a result of which the damping device 7 takes effect. As soon as the damper piston 72 is completely retracted, the maximum open position OS is reached (not represented).

(49) The portion of movement of the movable furniture part 2 upstream of the maximum open position OS is thus damped, wherein the damping starting position D is set differently via the damper setting unit 8. As a result, different opening angles can be set for the start of the damping movement.

(50) The same principle also applies to the closing movement S.

(51) In FIGS. 7a and 7bstarting from FIGS. 4a to 5ba closing movement S of the actuating arm device 5 has been carried out. As a result, the actuating arm 52 has been pivoted downwards. This closing movement S was carried out until the stop element 56 contacted the second damping transmission element 5b through the rotational movement of the actuating arm 52 about the pivot pin X. In this position, the damping starting position D is reached in each case.

(52) As the damping devices 7 are located in different maximum positions in FIGS. 7a and 7b, the actuating arm 52 adopts a different angular position in the case of the respectively given damping starting position D. Specifically, there is an opening angle of approximately 22 in FIG. 7a, whereas there is an opening angle of just 33 in FIG. 7b.

(53) If the closing movement S is continued from this respective damping starting position D, the second damping transmission element 5b is rotated counterclockwise about the axle pin 57 via the stop element 56, as a result of which the damping transmission element 5b presses on the damper piston 72 via the stop 58 and pushes it into the damper housing 71, as a result of which the damping device 7 again takes effect. As soon as the damper piston 72 is completely retracted, the closed position SS is reached (not represented).

(54) In FIG. 8, the entire piece of furniture 100 is represented in a perspective view. In this view, the power supply unit 21, via which an electric drive unit 1.2 (not recognizable here) can be supplied with power, can be recognized.

(55) In FIG. 8, on both sides of the furniture carcass 3 there is also a detecting device 22 for detecting an overpressure movement and/or for triggering a closing movement S. If the movable furniture part 2 is located in the closed position SS and a user presses on the movable furniture part 2, this is detected by the detecting device 22, whereupon an opening movement O of the furniture drive system 1 is initiated via the control device 44 and the electric drive unit 1.2. In the case of a movable furniture part 2 that is open as in FIG. 8, a user can press directly on one of the detecting devices 22, whereupon a closing movement S of the furniture drive system 1 is initiated via the control device 44 and the electric drive unit 1.2.

(56) In FIG. 9, only the furniture carcass 3 together with the furniture drive systems 1 arranged on both sides of the furniture carcass 3 is represented in a perspective view. The protective faceplate 23 of the electric drive unit 1.2 can be easily recognized.

(57) FIG. 10 shows the furniture drive system 1, which contains the mechanical actuating unit 1.1 and the electric drive unit 1.2, in a perspective view. These two units 1.1 and 1.2 are releasably connected to each other laterally via their respective housing. The entire furniture drive system 1 can be fastened to a furniture carcass 3 via the support 4. The electric drive unit 1.2 has the protective faceplate 23.

(58) In FIG. 11, the furniture drive system 1 is again represented in perspective, wherein however the protective faceplate 23 has been omitted, as a result of which the view onto the cover 24 also forming the housing of the electric drive unit 1.2 is unobstructed. A visual indication signal H can be displayed on this cover 24 of the furniture drive system 1.

(59) In FIG. 12, the electric drive unit 1.2 and the mechanical actuating unit 1.1 are represented separately. In the housing of the mechanical actuating unit 1.1, a (curved) engagement opening is formed, via which an engagement in the actuator 58 of the actuating arm device 5 is possible.

(60) In line with this, in FIG. 13, which shows a different angle of view onto the furniture drive system 1, the driver 31 protruding out of a (curved) exit opening 26 in the housing of the electric drive unit 1.2 can be seen.

(61) In FIG. 14, only the housing of the electric drive unit 1.2 together with the cover 24 is represented.

(62) FIG. 15 shows the electric drive unit 1.2 with a view onto the side facing the mechanical actuating unit 1.1. In the embodiment represented, the driver 31 is formed as a peg, which is mounted displaceable to a limited extent in a guide contour (exit opening 26), which is formed in the housing. The driver 31 projects from the housing on the side which faces the mechanical actuating unit 1.1.

(63) FIG. 16 shows the electric drive unit 1.2 of the furniture drive system 1 in a perspective detailed representation, wherein the part of the cover 24 pointing in the direction of the mechanical actuating unit 1.2 has been omitted.

(64) The electric drive unit 1.2 comprises an electric motor 30 for the electric motor-powered support of the movement of the movable furniture part 2, which can be fastened to the actuating arm 52. Furthermore, the electric drive unit 1.2 comprises a driver 31, which can be driven (indirectly) by the electric motor 30, for transmitting a torque of the electric motor 30 to the mechanical actuating unit 1.2 or to the actuating arm 52 and a furniture part 2 that may possibly be connected to it.

(65) The mechanical actuating unit 1.1 and the electric drive unit 1.2 can be connected to each other releasably. As a result, the electric drive unit 1.2 can be connected to the mechanical actuating unit 1.1 or separated from it in a simple manner.

(66) The components of the electric drive unit 1.2 can be arranged in a housing comprising the cover 24, as represented. The housing rests against the mechanical actuating unit 1.2 at least in regions and, in the embodiment represented, separates the mechanical actuating unit 1.1 from the assembly of the electric drive unit 1.2.

(67) In place of a housing, an installation plate which does not enclose the assembly of the electric drive unit 1.2 but delimits and supports it only on one side can also be used, for example.

(68) Between the electric motor 30 and the driver 31, a gear mechanism 32 is provided, which converts a torque of the electric motor 30 into a pivoting movement of the driver 31 about a pivot pin 33.

(69) The gear mechanism 32 comprises several gear stages (worm gear 40 and cogwheels 34, 35, 36, 37, 38 and 39). The gear stages 34 to 40 are in engagement with each other in each case via gear-tooth systems. Furthermore, the gear mechanism 32 comprises a freewheel clutch 41, which is integrated in the cogwheel 36, and an overload clutch 42, which is integrated in the cogwheel 39.

(70) The electric drive unit 1.2 also has its own damping device 43 for damping the movement of the driver 31 about the pivot pin 33.

(71) Returning to FIG. 1, the following may be described in more detail.

(72) The control device 44 is also represented schematically in FIG. 1. This control device 44 can be formed separately from the furniture drive system 1. It is preferably provided that this control device 44 is integrated in the furniture drive system 1. This control device 44 is particularly preferably arranged on a printed circuit board also forming the electric drive unit 1.2.

(73) The control device 44 has a determining device 45 for determining the force that can be exerted or is exerted on the actuating arm device 5 by the at least one drive device A.

(74) The determining device 45 has a sensor 46 for measuring the power consumption of the electric motor 30. The sensor 46 can also be arranged on the printed circuit board and is in signaling connection with the electric motor 30. The measured power consumption value E of the electric motor 30 is compared with a reference value V.sub.Epreferably determined in a reference movement. In the case of a deviation (e.g. by a particular threshold value T.sub.E), a deviation signal W is emitted.

(75) The determining device additionally (or alternatively) has an angle sensor 47 for measuring the angular position of the actuating arm device 5. The angle sensor 46 can also be arranged on the printed circuit board and detects the angular position of the actuating arm 52 of the actuating arm device 5 at different points in time. The speed G of the actuating arm 52 determined therefrom is compared with a reference value V.sub.Gpreferably determined in a reference movement. In the case of a deviation (e.g. by a particular threshold value T.sub.G), a deviation signal W is emitted.

LIST OF REFERENCE NUMBERS

(76) 1 furniture drive system 1.1 mechanical actuating unit 1.2 electric drive unit 2 movable furniture part 2a first furniture flap 2b second furniture flap 3 furniture carcass 3a side wall 4 support 5 actuating arm device 5a first damping transmission element 5b second damping transmission element 51 transmission mechanism 52 actuating arm 53 control cam 54 pressure roller 55 stop 56 stop element 57 axle pin 58 actuator 59 transmission opening 6 energy storage mechanism 7 damping device 71 damper housing 72 damper piston 73 damping device 74 stop counterpiece 8 damper setting unit 8a setting device 8x setting axle pin 8b, 8c indentations 9a hinges 9b hinges 10 ceiling 11 actuating arm extension 11a first actuating arm part 11b second actuating arm part 12 fastening device 14 energy storage mechanism setting unit 14a setting wheel 15 point of application 16 threaded spindle 17a opening 19 intermediate lever 19a pivot pin 20 installation safety device 20a centrifugal clutch 21 power supply unit 22 detecting device 23 protective faceplate 24 cover 25 engagement opening 26 exit opening 30 electric motor 31 driver 32 gear mechanism 33 pivot pin 34 cogwheel (gear stage) 35 cogwheel (gear stage) 36 cogwheel (gear stage) 37 cogwheel (gear stage) 38 cogwheel (gear stage) 39 cogwheel (gear stage) 40 worm gear (gear stage) 41 freewheel clutch 42 overload clutch 43 damping device 44 control device 45 determining device 46 sensor for measuring the power consumption 47 angle sensor 100 piece of furniture A drive device D damping starting position S closing movement O opening movement SS closed position OS maximum open position X pivot pin H indication signal E power consumption value V.sub.E reference value (power consumption) V.sub.G reference value (speed) T.sub.E threshold value (power consumption) T.sub.G threshold value (speed) W deviation signal G speed