Drive device for a movable furniture part

Abstract

A drive device for a movable furniture part including a support to be fastened to a furniture carcass, an actuation arm device mounted movably on the support and to be connected to the movable furniture part, an energy store for applying force to the actuation arm device, a damping device for damping a closing and opening movement of the actuation arm device, and an adjusting device for adjusting a force of the damping device, a damping start position in relation to an angle position of the actuation arm device, and/or in terms of a damping travel. The adjusting device includes an adjusting element coupled to the damping device such that an adjustment of the damping force, damping start position, and/or damping travel takes effect when the actuation arm device is damped during the closing movement, and when the actuation arm device is damped during the opening movement.

Claims

1. A drive device for a movable furniture part, comprising: a support to be fastened to a furniture carcass, an actuating arm device mounted movably on the support and to be connected to the movable furniture part, an energy storage mechanism configured to apply a force to the actuating arm device, a damping device having a damper housing and being configured to dampen a closing movement and an opening movement of the actuating arm device, and an adjustment device configured to adjust a relative position between the damper housing and the support such that the damping device is adjustable in terms of a damping start position in relation to an angle position of the actuating arm device relative to the support, wherein the adjustment device comprises an adjustment element coupled to the damping device such that an adjustment of the damping force, of the damping start position, and/or of the damping stroke carried out by the adjustment device can be performed on the damping device both when damping the actuating arm device during the closing movement and when damping the actuating arm device during the opening movement.

2. The drive device according to claim 1, wherein the damping device is configured to be impinged on by the actuating arm device from the same side both during the opening movement and during the closing movement.

3. The drive device according to claim 1, wherein the damping device has a damper piston movable relative to the damper housing, and has a damping agent.

4. The drive device according to claim 3, wherein the actuating arm device rests against the damper piston during a damping movement.

5. The drive device according to claim 4, wherein the damper housing is stationary relative to the support during a damping movement.

6. The drive device according to claim 3, wherein a relative position between the damper housing and the support is adjustable by switching the adjustment element of the adjustment device between two positions, the adjustment element being a toollessly actuatable adjustment element in the form of a switch.

7. The drive device according to claim 3, wherein the damping agent is a damping fluid arranged in a fluid chamber of the damper housing to dampen a relative movement between the damper housing and the damper piston.

8. The drive device according to claim 1, wherein the actuating arm device is movable between a first maximum position, corresponding to a closed position between movable furniture part and furniture carcass, and a second maximum position, corresponding to a maximum open position of the movable furniture part relative to the furniture carcass.

9. The drive device according to claim 8, wherein the damping is effected via the damping device in a damping movement portion of the movable furniture part before reaching the closed position when the movable furniture part is moving in a closing direction and before reaching the maximum open position when the movable furniture part is moving in an opening direction.

10. The drive device according to claim 9, wherein the damping movement portion corresponds to a pivot angle range of between 2 and 25.

11. The drive device according to claim 9, wherein the damping movement portion corresponds to a pivot angle range of between 5 and 15.

12. The drive device according to claim 1, wherein the actuating arm device has a transfer mechanism for transferring a force of the energy storage mechanism to an actuating arm of the actuating arm device.

13. The drive device according to claim 12, wherein the transfer mechanism has a control cam and a pressure roller loaded by the energy storage mechanism, wherein the pressure roller is movable along the control cam during a movement of the actuating arm.

14. The drive device according to claim 1, wherein the actuating arm device has a damping transmission element movable with the actuating arm device and resting via a limit stop against the damping device during a damping movement.

15. The drive device according to claim 14, wherein the damping transmission element is formed on the actuating arm and is configured to dampen the opening movement of the actuating arm device.

16. The drive device according to claim 15, wherein the damping transmission element is configured to dampen the opening movement of the actuating arm device in a damping portion of the movable furniture part while traveling in an opening direction before reaching the maximum open position.

17. The drive device according to claim 14, wherein the damping transmission element is a first damping transmission element, the actuating arm device further having a second damping transmission element mounted rotatably on the support and being at least partially movement-coupled to the transfer mechanism, the second damping transmission element being configured to dampen the closing movement of the actuating arm device.

18. The drive device according to claim 14, wherein the damping transmission element is a first damping transmission element, further comprising a second damping transmission element, and each of the first damping transmission element and the second damping transmission element is movable with the actuating arm device and rests via a limit stop against a damper piston of the damping device during the damping movement.

19. The drive device according to claim 1, wherein the energy storage mechanism is arranged between the support and the actuating arm device and is active between the support and the actuating arm device.

20. A piece of furniture comprising: a furniture carcass, a furniture part mounted movably on the furniture carcass, and a drive device according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

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

(2) FIG. 1 is a schematic view of a piece of furniture with a drive device for a furniture flap,

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

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

(5) FIGS. 3a+3b are perspective representations of the drive device,

(6) FIGS. 4a+4b are longitudinal sections through the drive device in a central open position,

(7) FIGS. 5a+5b are details for FIGS. 4a and 4b,

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

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

(10) FIGS. 8a+8b are different views of a longitudinal section through the damping device,

(11) FIGS. 9a+9b are perspective views of a second embodiment of the adjustment device, including details,

(12) FIGS. 10a+10b are perspective views of a third embodiment of the adjustment device and

(13) FIGS. 11a-11c are various representations of an embodiment with a linearly displaceable damper housing.

DETAILED DESCRIPTION OF THE INVENTION

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

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

(16) The drive device 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, swivelable relative to the support 4, which is connected to the movable furniture part 2, preferably to the second furniture flap 2b.

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

(18) FIG. 2a shows the drive device 1 in a side view, wherein the drive device 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 swivelable about an axis of rotation X.

(19) In the embodiment shown, an actuating arm extension 11 is detachably arranged on the actuating arm 52, wherein the actuating arm extension 11 has two actuating arm parts 11a, 11b displaceable relative to each other. Preferably, the actuating arm parts 11a, 11b are telescopically displaceable relative to each other, wherein the first actuating arm part 1la is detachably connectable to the actuating arm 52. The second actuating arm part 11b has a fastening device 12, detachably connectable, preferably toollessly lockable and releasable, to a fitting part to be fastened to the movable furniture part 2.

(20) 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 coil 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 store in the form of a gas spring.

(21) The actuating arm device 5 has a transfer mechanism 51 for transferring a force of the energy storage mechanism 6 to the at least one actuating arm 52. Preferably, the transfer 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.

(22) The control cam 53 can be arranged or formed on the actuating arm 52 according to a preferred embodiment. Of course, it is also possible to arrange the control cam 53 in another location in the transfer mechanism 51 of the actuating arm device 5.

(23) Through a force adjustment device 14, a force of the energy storage mechanism 6 can be adjusted to the at least one actuating arm 52. Preferably: the force adjustment device 14 has at least one rotatably mounted adjustment wheel 14a, wherein a force of the energy storage mechanism 6, acting on the at least one actuating arm 52, can be adjusted to the actuating arm 52 by rotating the adjustment wheel 14a, and/or the force adjustment device 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 force adjustment device 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 an adjustment wheel 14a of the force adjustment device 14 is actuatable through the opening 17a from a direction transverse to the front face.

(24) FIG. 2b shows the region encircled in FIG. 2a in an enlarged view. The transfer mechanism 51 has an intermediate lever 19, which is mounted on the support 4 swivelable about an axis of rotation 19a. The threaded spindle 16 is mounted on the intermediate lever 19. By rotating the adjustment wheel 14a of the force adjustment device 14 by means of a tool, the threaded spindle 16 is rotatable, whereby 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 axis of rotation 19a of the intermediate lever 19 and thus the torque of the energy storage mechanism 6 acting on the actuating arm 52 can be made larger and smaller.

(25) The drive device 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. Preferably the damping device 7: is formed as a fluid damper, and/or has at least one piston-cylinder unit, and/or can be impinged on by the at least one actuating arm 52 during a closing movement, and/or can be impinged 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.

(26) FIG. 3a shows the drive device 1 in a perspective view, wherein a force of the energy storage mechanism 6 can be transferred to the at least one actuating arm 52 by the transfer mechanism 51 of the actuating arm device 5. The force adjustment device 14 can comprise for example a rotatable adjustment wheel 14a, wherein the point of application 15 of the energy storage mechanism 6 along the threaded spindle 16 and thus the torque acting on the actuating arm 52 can be adjusted by rotating the adjustment wheel 14a.

(27) In addition, the drive device 1 can have an installation-securing device 20 for the empty actuating arm 52, thus on which no movable furniture part 2 has yet been installed, for limiting an opening speed of the empty actuating arm 52, wherein the installation-securing device 20 prevents an unintentional opening or swinging-out of the empty actuating arm 52 through a force of the energy storage mechanism 6. It is preferably provided that the installation-securing device 20 comprises at least one centrifugal clutch 20a.

(28) FIG. 3b shows the drive device 1 in a further (slightly offset) perspective view. The entire damping device 7 can easily be seen in this representation. This damping device 7 has the damper housing 71 and the damper piston 72.

(29) The damping device 7 is adjustable relative to the support 4 via an adjustment device 8. The adjustment device 8 has an adjustment element 8a (in the form of a switch) and the adjustment axle pin 8x. The adjustment axle pin 8x is fixedly connected to the support 4.

(30) In FIG. 3b the adjustment element 8a is pivoted to the right, whereby the damping device 7 is in a maximum position to the right relative to the support 4.

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

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

(33) FIGS. 4a to 7b show in each case a vertical longitudinal section through the drive device in different positions.

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

(35) However, FIGS. 4a and 4b differ to the effect that the damping device 7 is in different positions. In FIG. 4b the damping device 7 is in its maximum position to the right. As can be seen in the associated enlarged representation according to FIG. 5b, the adjustment element 8a is rotated to the right about the adjustment axle pin 8x. As a result, there is a relatively wide range for adjustment of the adjustment element 8a between the damper housing 71 and the adjustment axle pin 8x (which is fixedly connected to the support 4).

(36) In contrast, in FIG. 4a and in the associated FIG. 5a, the adjustment element 8a of the adjustment device is rotated to the left by 90. As a result, there is a relatively narrow range of the adjustment element 8a between the damper housing 71 and the adjustment axle pin 8x. The damping device 7 is in its maximum position to the left.

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

(38) By comparing FIGS. 5a and 5b it can be seen that the damper housing 71 has also performed a (slight) swivel movement relative to the support 4 in addition to a translational displacement movement relative to the support 4.

(39) In FIGS. 6a and 6b an opening movement O of the actuating arm device 5 has been performedstarting from the earlier FIGS. 4a to 5b. The actuating arm 52 has thereby been swiveled upwards. This opening movement O was performed until the limit stop 55 of the first damping transmission element 5a contacts the limit stop counterpart 74. The damping start position D is reached in this position in each case.

(40) As the damping devices 7 in FIGS. 6a and 6b are in different maximum positions, the actuating arm 52 occupies a different angle position in the case of the damping start position D given in each case. Specifically, an opening angle of approximately 108 is given in FIG. 6a, while an opening angle of 100 is given in FIG. 6b.

(41) If the opening movement O is continued from this respective damping start position D, the damper piston 72 is pushed into the damper housing 71 via the limit stop counterpart 74, whereby the damping effect of the damping device 7 occurs. As soon as the damper piston 72 has retracted entirely, the maximum open position OS is reached (not represented).

(42) The movement portion of the movable furniture part 2 upstream (i.e., before with respect to the opening movement) of the maximum open position OS is thus damped, wherein the damping start position D is adjusted differently via the adjustment device 8. Different opening angles can thereby be adjusted for the start of the damping movement.

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

(44) In FIGS. 7a and 7b a closing movement S of the actuating arm device 5 has been performedstarting from FIGS. 4a to 5b. The actuating arm 52 has thereby been swiveled downwards. This closing movement S was performed until the limit stop element 56 contacts the second damping transmission element 5b due to the rotational movement of the actuating arm 52 about the axis of rotation X. The damping start position D is reached in this position in each case.

(45) As the damping devices 7 in FIGS. 7a and 7b are in different maximum positions, the actuating arm 52 occupies a different angle position in the case of the damping start position D given in each case. Specifically, an opening angle of approximately 22 is given in FIG. 7a, while an opening angle of just under 33 is given in FIG. 7b.

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

(47) The damping device 7 is represented without the other constituents of the drive device 1 in a longitudinal section in FIGS. 8a and 8b. The damper piston 72 has retracted, whereby the damping end position is virtually reached. (The internal structure of the damping device 7 is not described in more detail as it corresponds to a fluid damper known per se.)

(48) FIGS. 9a and 9b show another embodiment of an adjustment device 8. Again the damping device 7 is adjustably mounted in the support 4. The adjustment axle pin 8x of the adjustment device 8 is fixedly connected to the support 4. The adjustment means 8a is formed as a wing-like extension on the damper housing 71. On its front face the damper housing 71 has depressions 8b and 8c of different depths which are arranged transverse (preferably at right angles) to each other. In FIG. 9a and in the associated detail the adjustment axle pin 8x is located in the deeper depression 8c, whereby the damping device 7 is in its maximum position to the left.

(49) In FIG. 9b the damper housing 71 has been rotated about the longitudinal axis by approx. 90 manually via the adjustment means 8a. As a result the adjustment axle pin 8x is now located in the less deep depression 8b, whereby the damping start position D is correspondingly adjusted.

(50) Finally, FIG. 10a shows a further embodiment of a damping device 7, wherein a, preferably manually insertable, spacer is used as adjustment means 8a. The maximum position to the right is thereby reached in FIG. 10a.

(51) In FIG. 10b this adjustment means 8a of the adjustment device 8 has been removed, whereby the adjustment axle pin 8x has moved further in the direction of the damper housing 71 and the maximum position to the left is given, which again corresponds to a damping start position in the case of another opening angle.

(52) A further embodiment is represented in FIGS. 11a to 11c. The basic mode of operation is the same as in the case of the previously described embodiments, which is why the description of most components is not repeated again.

(53) This embodiment according to FIGS. 11a to 11c differs to the effect that the damper housing 71 is mounted on the support 4 only linearly displaceably.

(54) In FIG. 11a the actuating arm 52 has approximately the same position as in FIG. 6b. In FIG. 11b the position of the actuating arm 52 approximately corresponds to that of FIG. 6a. The damper housing 71 in FIGS. 11a and 11b is in different positions relative to the support 4 (and the adjustment axle pin 8x arranged on the support 4) via the adjustment device 8, whereby different damping start positions D are given.

(55) The drive device 1 is represented cut along a longitudinal plane in FIG. 11c, whereby details of the damper housing 71 can be seen. Specifically, a guide surface 76, via which the damper housing 71 rests against the guide element 75 arranged on the support 4, is formed on the damper housing 71. The damper housing 71 can slide linearly along the guide element 75 over the guide surface 76.

(56) In the detail at the top left, the first damping transmission element 5a and the second damping transmission element 5b can still be seen, which in each case rest against the damper housing 71.

LIST OF REFERENCE NUMBERS

(57) 1 drive device 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 transfer mechanism 52 actuating arm 53 control cam 54 pressure roller 55 limit stop 56 limit stop element 57 axle pin 6 energy storage mechanism 7 damping device 71 damper housing 72 damper piston 73 damping agent 74 limit stop counterpart 75 guide element 76 guide surface 8 adjustment device 8a adjustment means 8x adjustment axle pin 8b, 8c depressions 9a hinges 9b hinges 10 ceiling 11 actuating arm extension 11a first actuating arm part 11b second actuating arm part 12 fastening device 14 force adjustment device 14a adjustment wheel 15 point of application 16 threaded spindle 17a opening 19 intermediate lever 19a axis of rotation 20 installation-securing device 20a centrifugal clutch 100 piece of furniture D damping start position S closing movement O opening movement SS closed position OS maximum open position X axis of rotation