EP1460917A1

EP1460917A1 - Furniture drive for adjusting parts of an item of furniture in relation to each other

Info

Publication number: EP1460917A1
Application number: EP02795249A
Authority: EP
Inventors: Eckhart Dewert
Original assignee: Linak AS
Current assignee: Linak AS
Priority date: 2002-01-04
Filing date: 2002-12-20
Publication date: 2004-09-29
Also published as: US7009353B2; WO2003055359A1; CN1620262A; AU2002360064A1; DE10200169A1; JP2005512714A; AU2002360064B2; CN1270657C; US20050061096A1

Abstract

An electric-motor driven furniture drive (2) for adjusting parts of an item of furniture in relation to each other, comprising two electric-motor driven adjustment units (4,6), both of which in an assembled position of the furniture drive (2) are actively connected to a part of the item of furniture to be adjusted in order to adjust same. According to the invention, a common drive motor (24) is provided in order to drive the adjustment units (4,6), in addition to coupling means which can move between a first and a second position. In the first position, said coupling means are used to couple the drive motor to the first adjustment unit (4) and in the second position, said coupling means are used to couple the drive motor to the second adjustment unit (6), thereby establishing a drive connection with the respective adjustment unit (4,6).

Description

Furniture drive for adjusting parts of a piece of furniture relative to one another

The invention relates to an electromotive furniture drive of the type mentioned in the preamble of claim 1 for adjusting parts of a piece of furniture relative to one another. Electromotive furniture drives are generally known and are used for example for adjusting parts of slatted frames or the like.

Furniture drives of the type in question are known from EP 0372032 B1, DE 3842078 C2, EP 0583660 B1, DE 10017978 AI, DE 10017979 AI and WO 01/76422 AI, which are also referred to as double drives. The known furniture drives have two adjustment units which can be driven by an electric motor, each of which, in the assembly position of the furniture drive, is operatively connected to a part of the furniture to be adjusted for adjusting the same. For example, one of the adjustment units can be used to adjust an upper body support part of a slatted frame, while the other can be used to adjust a leg support part of the slatted frame. The adjustment units can be designed, for example, as spindle drives, the spindle nut of which serves for pivoting a pivot shaft which is in contact with the part of the slatted frame to be adjusted There is an active connection, as is known for example from WO 01/76422 AI and there in particular from FIG. 2. In order to be able to drive the adjustment units independently of one another, a separate drive motor is assigned to each adjustment unit, the drive motors being controllable jointly or independently of one another.

The known furniture drives offer a high level of adjustment comfort. However, it is disadvantageous that the known furniture drives are relatively complex to construct and thus relatively expensive to manufacture.

The invention has for its object to provide a furniture drive of the type mentioned in the preamble of claim 1, which is simpler and therefore less expensive to manufacture.

This object is achieved by the teaching specified in claim 1.

The invention frees itself from the idea of assigning a separate drive motor to each adjustment unit. Rather, it is based on the idea of providing a common drive motor for driving the adjustment units. In this way, the structure of the furniture drive according to the invention is designed to be considerably simpler and therefore more cost-effective. To the adjustment comfort of the known

To obtain furniture drives, the invention provides coupling means which are movable between a first position and a second position and which couple the drive motor to the first adjustment unit in the first position and to the second adjustment unit in the second position and thus in drive connection with the bring the respective adjustment unit. In this way, the adjustment units can be driven independently of one another, so that those assigned to the adjustment units Parts of the piece of furniture, for example an upper body support part and a leg support part of a slatted frame, can be adjusted independently of one another. In this way, the same ease of adjustment results as in double drives according to the prior art, in which each adjustment unit is assigned a separate drive motor.

The double drive according to the invention is suitable for adjusting parts of any furniture, for example parts of seating and / or reclining furniture. The furniture drive according to the invention is particularly well suited for adjusting parts of a slatted frame or the like.

The adjustment units can be designed in any suitable manner. Likewise, the power transmission from the common drive motor to the adjustment units can take place in any suitable manner. A further development of the teaching according to the invention provides that the adjusting units each have a drive element which can be driven in rotation, the

Drive motor is in rotary drive connection in a first position of the coupling means with the drive element of the first adjusting unit and in the second position of the coupling means with the drive element of the second adjusting unit. In this embodiment, the adjustment units can be designed in the manner of a linear drive, wherein the force can be transmitted from the adjustment units to the part of the piece of furniture assigned to the respective adjustment unit using an adjustment mechanism which can be selected within wide limits in accordance with the respective requirements.

A further development of the aforementioned embodiment provides that the rotationally drivable drive element is part of a spindle drive which has a linearly movable Ches adjusting element, which is in operative position in the mounting position of the furniture drive with a part of the furniture to be adjusted. Such spindle drives are available as simple and inexpensive standard components, so that the structure of the furniture drive according to the invention is further simplified and is therefore more cost-effective. In addition, spindle drives are robust and suitable for applying large forces. In the aforementioned embodiment, the drive element can, according to a further development, be a stationary, rotatably mounted spindle on which a spindle nut is arranged, which forms the adjustment element or is connected to the adjustment element, so that it can rotate and move in the axial direction.

In a kinematic reversal of the aforementioned embodiment, however, the drive element can also be a fixed, rotatably mounted spindle nut which is arranged on a spindle which is secure against rotation and movable in the axial direction and which forms the adjusting element or is connected to the adjusting element.

The power transmission from the adjusting element of the spindle drive to the assigned part of the piece of furniture to be adjusted can take place in any suitable manner. A particularly simple and therefore inexpensive embodiment can provide that the linearly movable adjusting element in the mounting position of the furniture drive has a pivoted shaft is in operative connection for pivoting the same, the shaft being connected to a part of the

Möbels is in operative connection. Such an adjustment mechanism is generally known and is particularly suitable for adjusting slatted frames. With regard to the formation of such an adjustment mechanism in one individual reference is made to WO 01/76422 AI, the disclosure content of which is hereby incorporated by reference into the present application. The shaft is usually not part of the furniture drive, but rather part of the furniture, for example a slatted frame.

In order to enable a power transmission from the linearly movable drive element to the shaft in a particularly simple manner, a further development of the aforementioned embodiment provides that a pivot lever is connected to the shaft in a rotationally fixed manner, which can be pivoted by means of the linearly movable adjusting element.

The coupling means provided according to the invention can be designed in any suitable manner as long as it is ensured that both adjustment units can be brought into drive connection with the common drive motor. With a corresponding design of the furniture drive according to the invention, it is possible to bring the adjusting units into drive connection with the drive motor either simultaneously or in succession.

An extremely advantageous embodiment of the basic idea of the teaching according to the invention provides that the coupling means have a coupling arrangement which, in a first coupling position, couples the drive element of the first adjustment unit and in a second coupling position the drive element of the second adjustment unit to the drive motor and thus also the drive motor in a rotary drive connection brings the respective drive element. In this embodiment, the coupling means work in the manner of a coupling.

It is generally sufficient if the coupling arrangement has a first clutch position in which the drive element of the first adjustment unit is coupled to the drive motor, and a second clutch position in which the drive element of the second adjustment unit is coupled to the drive motor, either the drive element of the first adjustment unit or the drive element the second adjustment unit is coupled to the drive motor. In order to further increase the ease of adjustment, a further development of the aforementioned embodiment provides that the clutch arrangement has a third clutch position in which both the drive element of the first adjustment unit and the drive element of the second adjustment unit are coupled to the drive motor. In this embodiment, the adjusting units can be adjusted either separately from one another or together in accordance with the coupling position selected in each case, so that the same adjustment comfort is achieved as with furniture drives according to the prior art, in which each adjusting unit is assigned a separate drive motor.

Basically, the furniture drive can be constructed in such a way that in each coupling position there is at least one adjustment unit in drive connection with the drive motor. A particularly advantageous development of the embodiment with the clutch arrangement provides, however, that the clutch arrangement has a fourth clutch position in which both the drive element of the first adjustment unit and the drive element of the second adjustment unit are uncoupled from the drive motor. In this embodiment, both adjusting units are uncoupled from the drive motor in the fourth clutch position, see above that it is possible, for example, with the appropriate design of the adjusting units, to manually reset the parts of the furniture adjusted by means of the adjusting units in the fourth coupling position when the drive motor is switched off.

The clutch arrangement expediently has at least one shift clutch. With a corresponding design of the clutch, a single clutch is sufficient to couple the first adjustment unit and the second adjustment unit to the drive motor. However, it is also possible, for example, to assign a separate clutch to each adjustment unit.

The clutch can be selected according to the respective requirements. For example, the clutch can be a friction clutch. An advantageous development provides that the clutch is a positive clutch. Such clutches are simple and therefore inexpensive to manufacture and suitable for the transmission of high torques.

A further development of the aforementioned embodiment provides that the clutch has a drive-side coupling element, which is connected to the drive motor in a rotary drive connection, and that the drive elements of the adjustment units which can be driven in rotation are each assigned an output-side coupling element, the output-side coupling elements for Coupling the respective adjustment unit to the drive motor with the drive-side coupling element can be brought into engagement. In this embodiment, the clutch is of a particularly simple design and is therefore inexpensive.

The power transmission from the respective output side coupling element on the drive element of the respective adjustment unit can be done in any suitable manner. According to one embodiment, the output-side coupling element assigned to an adjustment unit is connected in a rotationally fixed manner to the drive element of this adjustment unit. If the adjustment units are designed, for example, as spindle drives, the respective coupling element on the output side can be fitted in a rotationally fixed manner on the spindle of the spindle drive.

According to another embodiment, the output-side coupling element assigned to an adjustment unit can, however, also be connected to the drive element of this adjustment unit via a gear arrangement. In this embodiment, an additional reduction can be achieved, for example, by the gear arrangement.

In the aforementioned embodiment, the output-side coupling element is expediently designed as a gearwheel or is connected in a rotationally fixed manner to a gearwheel which engages with a gearwheel which is connected in a rotationally fixed manner to the drive element. In this embodiment, the gear arrangement is a gear transmission that is simple and therefore inexpensive to manufacture. If the axes of rotation of the output side

Coupling element and the drive element of the respective adjustment unit run parallel to each other, so it is expedient that the gears are spur gears. The drive-side coupling element can be designed in any suitable manner. A further development provides that the coupling element on the drive side is designed as a worm wheel or is connected in a rotationally fixed manner to a worm wheel which is connected to a drive shaft of the drive motor. which snail engages. In this embodiment, the force is transmitted from the output shaft of the drive motor to the drive-side coupling element in the manner of a worm drive, which is suitable for transmitting large forces and is simple and therefore inexpensive to produce.

An extremely advantageous development of the embodiment with the clutch provides that the drive-side clutch element and / or at least one of the drive-side clutch elements is or are axially movable, such that axial movement of the drive-side clutch element and / or at least one of the output-side coupling elements, the output-side coupling element can be brought out of engagement or into engagement with the input-side coupling element. In this embodiment, the clutch is switched by axially shifting one of the clutch elements. Such a clutch arrangement is particularly simple and therefore inexpensive to manufacture and robust in construction.

An expedient embodiment of the aforementioned embodiment provides that the coupling elements on the output side are arranged in a stationary manner and that the coupling element on the drive side is arranged in the axial direction between the coupling elements on the output side and is axially movable. In this embodiment, the clutch is switched by axially moving the drive-side clutch element, which can be moved back and forth in the axial direction between the drive-side clutch elements.

In a kinematic reversal of the aforementioned embodiment, however, the drive-side coupling element can also be arranged in a stationary manner, at least one of the output-side coupling elements is axially movable. In this embodiment, the clutch is switched by axially moving at least one of the clutch elements on the output side. A further development of the aforementioned embodiment provides that the coupling elements on the output side can be moved axially separately from one another. In this embodiment, the driven-side coupling elements and the associated adjustment units are units separated from each other to the drive motor Toggle ^'or from this uncoupled.

In order to further simplify the structure of the clutch arrangement and thus to make it more cost-effective, it is expedient for the clutch elements on the output side to be axially movable together. In this embodiment, the coupling elements on the output side and thus the adjustment units assigned to them are simultaneously coupled or uncoupled to the drive motor, for example in such a way that the other adjustment unit is uncoupled when one adjustment unit is coupled.

In order to axially move the output-side coupling elements together, an expedient embodiment provides that the output-side coupling elements are mounted at a fixed distance from one another on an axially movable shaft, the axial distance between the coupling elements being selected such that the shaft is in a first position the output-side coupling element of the first adjustment unit is in engagement with the input-side coupling element and the output-side coupling element of the second adjustment unit is out of engagement with the input-side coupling element, while the output-side coupling element is in a second position of the shaft the second adjusting unit is in engagement with the drive-side coupling element and the driven-side coupling element of the first adjusting unit is out of engagement with the driving-side coupling element. By sliding the shaft, this embodiment simultaneously enables coupling of one adjustment unit to the drive motor and uncoupling of the other adjustment unit from the drive motor. The shaft can be mounted in a housing of the furniture drive, for example by means of ball bearings.

Basically, it is sufficient if each adjustment unit is assigned an output-side coupling element. An extraordinarily advantageous development of the teaching according to the invention provides that at least one adjustment unit is assigned a further, preferably both adjustment units, each a further coupling element which is arranged in the axial direction on the side of the output-side coupling element of this adjustment unit facing away from the drive-side coupling element and with the drive element of this adjustment unit is in a rotary drive connection, such that the further coupling element and thus the drive element can be coupled to or uncoupled from the drive-side coupling element by axially moving the coupling element. This embodiment in particular enables the adjustment units to be coupled or uncoupled from one another to or from the drive motor. To establish a rotary drive connection between the further coupling element of an adjustment unit and the

Drive element of this adjustment unit, for example, the further coupling element can be connected to the drive element in a rotationally fixed manner. However, the further coupling element can also be connected, for example, via a drive arrangement, in particular a gear transmission, with the drive element in rotary drive connection.

In order to bring the further coupling element into engagement with the disengagement-side coupling element or out of engagement therewith in the abovementioned embodiment, it is expedient that the disengagement-side coupling elements of the adjusting units each have axial projections on their two axial sides with which they engage in the engage the respective coupling position in complementary recesses which are formed on the side of the drive-side coupling element and the further coupling element facing the respective output-side coupling element. By appropriately selecting the axial length of the projections, it is possible to select at which axial displacement of the output-side coupling element of the respective adjusting unit the further coupling element is coupled to and decoupled from the drive-side coupling element and thus from the drive motor.

The drive-side coupling element and the output-side coupling elements and possibly the further coupling elements are expediently mounted coaxially. In the embodiment in which the drive-side coupling element is axially movable, the drive motor can be arranged in a stationary manner. In this way, the structure is simple and therefore inexpensive. For example, the coupling element on the drive side can be formed by a worm wheel or with one

Worm gear can be rotatably connected, which is in engagement with a worm connected to the output shaft of the drive motor, in particular molded onto the output shaft. Since the drive motor is fixed net, the axial length of the worm wheel is selected in this embodiment so that the worm wheel is in engagement with the worm in all positions occurring during the axial displacement of the worm wheel.

Another further development of the embodiment with the axially movable drive-side coupling element provides that the drive-side coupling element is arranged together with the drive motor on a movable holder such that the drive-side coupling element is movable together with the drive motor. In this embodiment, the position of the drive-side coupling element relative to the output shaft of the electric motor does not change during the axial adjustment. If the drive-side coupling element and the output shaft of the electric motor are in engagement via a toothing, for example a worm gear, difficulties are avoided in this embodiment which could arise from a displacement of the toothing relative to one another.

In particular, damage to the toothing is avoided during the axial displacement of the coupling element.

The bracket can be moved in any suitable manner. The holder is expediently displaceable in the axial direction of the drive-side coupling element.

In principle, the movable coupling element can be moved back and forth between the different coupling positions by any suitable actuating means. In order to simplify the construction and thus to make it more cost-effective, it is expedient that spring means for pretensioning the movable coupling element or at least one of the movable coupling elements tion elements are provided in a starting position. In this embodiment, the spring means always return the movable coupling element to the starting position after an axial displacement. The spring means can be designed in any suitable manner, for example in accordance with the respective requirements as a tension or compression spring means. In principle, it is sufficient if the spring means have a single spring. If necessary, however, several springs can also be provided.

Actuating means are expediently provided for moving the movably mounted coupling element.

Another expedient development provides that the drive motor can be brought into rotary drive connection with the drive elements of the adjusting units via a gear arrangement. In this embodiment, a desired reduction can be achieved by appropriate selection of the gear arrangement. In connection with the aforementioned embodiment, a further embodiment of the basic idea of the teaching according to the invention provides that the coupling means have a movable holder on which at least one gear element of the gear arrangement is arranged, the holder being between a first position, in which brings the gear arrangement of the drive element of the first adjustment unit to the drive motor in rotary drive connection, and a second position in which the gear arrangement brings the drive element of the second adjustment unit to the drive motor in rotary drive connection is movable. In this embodiment, a clutch arrangement is not required. Rather, the adjustment units are coupled by a corresponding one Movement, for example displacement of the holder.

According to the respective requirements, the holder can be linearly displaceable and / or rotatable and / or tiltable, as is provided by further embodiments.

A particularly simple and therefore inexpensive production of the embodiment with the movable holder provides that the gear arrangement has a first and a second gear, which are arranged in a rotationally fixed manner on a common shaft which can be driven by the drive motor, and in that the drive element of the first adjusting unit has a third Gear and the drive element of the second adjustment unit is assigned a fourth gear, the holder being movable relative to the third and fourth gear such that in the first position of the holder the first gear is in engagement with the third gear while the second gear is disengaged from the fourth gear, and in the second position of the holder, the second gear is engaged with the fourth gear while the first gear is disengaged from the third gear.

If the holder is rotatably mounted, it is expedient that the first and the second gear are bevel gears, the holder being preferably rotatable in the radius around the output shaft of the drive motor.

In principle, the drive motor in the embodiment with the movable holder can be arranged to be stationary, provided that a corresponding gear arrangement ensures that the drive motor engages in the first and the second position of the holder with the one arranged on the holder. Neten gear arrangement is located. In order to simplify the construction, however, it is expedient for the drive motor to be arranged on the holder in such a way that the gear arrangement can be moved together with the drive motor. In this embodiment, the drive motor is always in drive connection with the gear arrangement, so that the gear arrangement can be simply constructed.

Another expedient development of the embodiment with the movable holder provides spring means for pretensioning the holder into an initial position. In this embodiment, the movable holder always returns to the starting position after a movement. Actuating means are expediently provided for moving the holder.

In the embodiments with at least one movable coupling element and the embodiments with the movable holder, the actuating means for moving the coupling element or the holder can be mechanical actuating means. In this way, no electrical energy is required to move the coupling element or the holder, so that the coupling element or the holder can be moved even when the furniture drive is de-energized. Another advantage of this embodiment is that the energy consumption is low.

In the aforementioned embodiment, the mechanical actuation means expediently have manually actuable traction means. The manually operable traction means can be formed, for example, by a cord, a rope or a Bowden cable or the like, so that the movable component can be moved by pulling the traction means by hand. In order to reduce the effort required to move the movable component, another embodiment provides that the actuating means are electromechanical actuating means. In this way, the ease of use is increased. The electromechanical actuating means can have at least one electromagnet and / or at least one servomotor, as further developments provide. The movable component, that is to say a movable coupling element or a movable holder, can be moved between its respective positions by means of the electric motor. If the electromechanical actuating means have, for example, an electromagnet, then a movable coupling element can be moved from a first coupling position to a second coupling position, for example by means of the electromagnet, while the resetting from the second coupling position to the first coupling position can take place, for example, under the action of spring means. In this way, the structure of the furniture drive according to the invention is further simplified. However, it is also possible to use, for example, two electromagnets that work in opposite directions.

For moving the movable component, that is to say a movable coupling element or a movable holder, at least one two-armed lever is expediently provided, one lever arm of which is in operative connection with the movable component and the other of which is with the actuating means. Such an arrangement is simple and therefore inexpensive to manufacture.

Switching means are expediently provided for switching the drive motor on and off.

According to the respective requirements at In the embodiments with the spindle drive, the spindle drive must be self-locking or not self-locking, as is provided for in the embodiments. If the spindle drive is self-locking, a part of the piece of furniture adjusted by means of the furniture drive according to the invention remains in the respective adjustment position after the adjustment. If, on the other hand, the spindle drive is not self-locking, an adjusted part of the piece of furniture can be reset by hand from the respective adjustment position to an initial position when the drive is switched off.

In order to enable both an adjustment of part of the furniture from an initial position to an adjustment position and a reset from the adjustment position to the initial position when the drive is switched on, it is expedient that control means are provided for controlling the direction of rotation of the drive motor.

The invention is explained in more detail below with reference to the accompanying drawing, in which exemplary embodiments of a furniture drive according to the invention are shown. It shows :

1 shows a schematic, partially sectioned side view of a first exemplary embodiment of an inventive one

Furniture drive in a first coupling position,

Fig. 2 in the same representation as Fig. 1

1 in a second coupling position,

3 is a schematic, partially sectioned view from above of a second embodiment of a furniture drive according to the invention in a first clutch position,

Fig. 4 in the same representation as Fig. 3 the

3 in a second coupling position, FIG. 5 in the same representation as FIG. 1, a third embodiment of a furniture drive according to the invention in a first coupling position,

6 in the same representation as FIG. 5, the furniture drive according to FIG. 5 in a second coupling position,

Fig. 7 in the same representation as Fig. 5 the

5 in a third coupling position, FIG. 8 in the same representation as FIG. 1, a fourth embodiment of a furniture drive according to the invention in a first coupling position,

9 in the same representation as FIG. 8, the furniture drive according to FIG. 8 in a second coupling position,

10, in the same representation as FIG. 1, a fifth exemplary embodiment of a furniture drive according to the invention in a first coupling position,

11 in the same representation as FIG. 10 the furniture drive according to FIG. 10 in a second coupling position,

12 shows the sixth embodiment of a furniture drive according to the invention in a first coupling position in the same representation as FIG. 1, FIG. 13 shows the furniture drive according to FIG. 12 in a same representation as FIG. 12 12 in the same representation as FIG. 12 the furniture drive according to FIG. 12 in a third coupling position, FIG. 15 in the same representation as FIG

12 in a fourth coupling position, FIG. 16 in the same representation as FIG. 1 shows a seventh embodiment of a furniture drive according to the invention in a first position of a movable holder, FIG. 17 in the same representation as FIG. 16 shows the furniture drive according to FIG 16 in a second position of the movable holder, FIG. 18 in the same representation as FIG. 16 shows a modification of the furniture drive according to FIG. 16, FIG. 19 in the same representation as FIG. 1 shows an eighth exemplary embodiment of a furniture drive according to the invention in a first position of a movable bracket and Fig. 20 in the same representation as Fig. 19 the

19 in a second position of the movable holder.

In the figures of the drawing, identical or corresponding components are provided with the same reference symbols.

1 shows an electromotive furniture drive 2 for adjusting parts of a piece of furniture relative to one another. shown otherwise, which is used in this embodiment for adjusting support parts of a slatted frame, not shown in the drawing. The furniture drive 2 has two adjustment units 4, 6 which can be driven by an electric motor, of which only the first adjustment unit 4 is explained in more detail below. The second adjustment unit 6 is constructed accordingly, and its components are provided with reference numerals corresponding to the components of the adjustment unit 4. The adjusting unit 4 is in operative position in the assembly position of the furniture drive 2 with an upper body support part of a slatted frame for adjusting the same, while the adjusting unit 6 is in operative connection with a leg support part of the slatted frame for adjusting the same. The leg support part of the slatted frame is assigned a shaft 10 which can be pivoted about an axis 8 and to which a pivot lever 12 is connected in a rotationally fixed manner. Correspondingly, the leg support part of the slatted frame is assigned a shaft 16 which can be pivoted about an axis 14 and with which a shaft 16 rotates

Swivel lever 18 is connected. The manner in which the upper body support part and the leg support part are pivoted by means of the shafts 10, 16 is known to the person skilled in the art and is therefore not explained in more detail here. For this, reference is made, for example, to WO 01 / 76422A1.

In this exemplary embodiment, the adjustment unit 4 is designed as a spindle drive and has a rotationally drivable drive element in the form of a stationary, rotatably mounted spindle 20, on which a spindle nut 22 is arranged, which forms an adjustment element of the adjustment unit 4 and is movable in the axial direction and loosely applied to the pivot lever 12 for pivoting the same. Will the Spindle 20 driven in rotation, the spindle nut 22 screws according to the direction of rotation of the spindle 22 in the drawing either to the right or to the left. According to the invention, a common drive motor 24 in the form of an electric motor is provided for driving the adjustment units 4, 6, the output shaft of which is designed as a worm 26. According to the invention, coupling means are also provided which are movable between a first position and a second position and which couple the drive motor 24 to the first adjustment unit 4 in the first position and to the second adjustment unit 6 in the second position and thus in drive connection with the respective one Bring adjustment unit 4, 6. In this exemplary embodiment, the coupling means have a clutch arrangement in the form of a clutch 28 which, in a first clutch position shown in FIG. 1, couples the spindle 20 of the adjusting unit 4 to the drive motor 24 and thus the drive motor 24 in rotary drive connection with the

Spindle 20 brings.

In this exemplary embodiment, the clutch 28 is designed as a positive clutch and has a clutch element 30 on the drive side, which in this embodiment is represented by a

Worm 26 of the drive motor 24 is in engagement worm wheel 30 is formed. The adjusting spindles 20, 20 'of the adjusting units 4, 6 are each assigned an output-side coupling element 32 or 32', the output-side coupling elements 32, 32 'for

Coupling the respective adjustment unit 4, 6 to the drive motor 24 with the drive-side coupling element 30 can be brought into engagement. The clutch element 32 on the output side is rotationally fixed to the spindle 20 connected, while the output-side coupling element 32 'is rotatably connected to the spindle 20'.

In the exemplary embodiment shown in FIG. 1, the drive-side coupling element 30 is in the axial direction of the spindles 20, 20 ', that is to say in FIG. 1, in

Movable in the direction of a double arrow 34, such that either the output-side coupling element 32 of the adjustment unit 4 or the output-side coupling element 32 'of the adjustment unit 6 can be brought into engagement with the drive-side coupling element 30 by axial movement of the drive-side coupling element 30. In order to couple the drive-side clutch element 30 to the respective drive-side clutch element 32 or 32 'in a rotationally fixed manner in the respective clutch position, the drive-side clutch element 30 has axial projections 34, 36 on its axial sides facing the drive-side clutch elements, which in the respective clutch position in FIG the projections 34, 36 have complementarily shaped recesses 38, 40 on the output-side coupling elements 32,

32 'engages. It cannot be seen from the drawing, and it is therefore explained here that the axial projections arranged on an axial side of the drive-side coupling element 30 extend only a short distance in the circumferential direction of the coupling element 30 and are spaced apart from one another in the circumferential direction, so that these In the coupling position, a positive connection between the drive-side coupling element 30 and the output-side coupling element 32 or 32 'is produced.

In order to axially move the drive-side coupling element 30 between the first coupling position shown in FIG. 1 and a second coupling position shown in FIG. 2, a Two-armed lever 42 is provided, one lever arm 44 engages on the drive-side coupling element 30 and the other lever arm 46 is connected to a mechanical actuating means in the form of a pull strap 48 that can be operated by hand. It cannot be seen from the drawing and it is therefore explained here that the lever arm 44 is designed as a fork and engages in a circumferential groove on the outer surface of the coupling element 30 on the drive side. In order to bias the drive-side coupling element 30 into the first coupling position shown in FIG. 1, spring means are provided in the form of a tension spring 50 designed as a helical spring.

At the free end of the lever arm 46 there is a switching link 52 which is used to actuate a switch 54 which is in control connection with the drive motor 24.

The function of the furniture drive 2 is as follows: In the first coupling position shown in FIG. 1, the drive-side coupling element 30 is pretensioned to the left via the two-armed lever 42 and the tension spring 50 in FIG. 1, so that it engages with the output-side coupling element 32 the adjustment unit 4. Here, the projections 34 of the drive-side coupling element 30 engage in the projections 38 of the output-side coupling element 32 of the adjusting unit 4, so that the drive-side coupling element 30 is connected in a rotationally fixed manner to the output-side coupling element 32 and thus to the spindle 20.

To switch on the furniture drive 2, the user pulls the drawstring 48 a short distance to the left in FIG. 1, the switching link 52 actuating the switch 54. actuates so that the drive motor 24 is switched on and drives the spindle 20 of the adjusting unit 4 via the worm 26 and the drive-side coupling element 30 designed as a worm wheel and the non-rotatably connected drive-side coupling element 32, so that the spindle nut 22 rotates accordingly the direction of rotation of the screw 26 of the drive motor 24 in the drawing to the right. Here, the spindle nut 22 pivots the swivel lever 12 so that the shaft 10 is swiveled about the axis 8 and the upper body support part of the slatted frame which is connected to the shaft 10 is adjusted. When a desired adjustment position has been reached, the user releases the drawstring 48 so that the switching link 52 switches off the drive motor 24.

It cannot be seen from the drawing and therefore it is explained here that the drive motor 24 is actuated by means of the switch 54 via a flip-flop circuit which is designed in such a way that the drive motor 24 is in one when the pulling band 48 is pulled in the first direction of rotation, while the drive motor 24 runs when the tension band 48 is pulled again in a direction opposite to the first direction of rotation. The axial width of the annular groove on the outer surface of the drive-side coupling element 30 is dimensioned such that when the drive motor 24 is switched on and the short angular movement of the two-armed lever 42 associated therewith, the drive-side coupling element 30 is not displaced in the axial direction.

In order to couple the drive motor 24 to the second adjustment unit 6, the user pulls again on the drawstring, the drive motor 24 first being briefly pulled in and then via the switching link 52 is switched off again. 1, the swivel lever 42 pivots clockwise in FIG. 1 so that its free end 44 takes the drive-side coupling element 30 with it and moves it axially in FIG. 1 to the right until the one shown in FIG 2 shown second clutch position is reached. In the second clutch position, the drive-side clutch element 30 engages with the projections 36 in the recesses 40 of the drive-side clutch element 32 ', so that the drive-side clutch element 30 is rotatably coupled to the drive-side clutch element 32' and thus the spindle 20 '. As can be seen from FIG. 2, the coupling element 30 on the drive side is disengaged from the coupling element 32 on the driven side of the adjusting unit 4, so that its spindle is uncoupled from the drive motor 24.

Then the user releases the drawstring 48 a short distance in Fig. 2 to the right, so that the switching link 52 switches on the drive motor 24, so that it now drives the adjusting spindle 20 'and the spindle nut 22' in Fig. 2 to the left screws and here the pivot lever 18 in Fig. 2 pivoted counterclockwise. As a result, the shaft 16 is pivoted about the axis 14 so that the leg support part of the slatted frame, not shown, is adjusted. If a desired adjustment position of the leg support part is reached, the user lets go of the tension band 48, so that the tension spring 50 pivots the two-armed lever 42 in FIG. 2 counterclockwise and this returns the drive-side coupling element 30 from the second coupling position shown in FIG. 2 moved into the first clutch position shown in Fig. 1. In this first clutch In the position, the adjusting spindle 20 of the adjusting unit 4 is in turn coupled to the coupling element 30 on the drive side, while the adjusting spindle 20 ′ of the adjusting unit 6 is uncoupled from the coupling element 30 on the driving side.

In the furniture drive 2 according to the invention, only a single drive motor 24 is required to drive the adjustment units 4, 6, so that the furniture drive 2 according to the invention is particularly simple and therefore inexpensive to manufacture. Because of the

Embodiment according to Fig. 1 formed by the clutch 28 coupling means, however, the adjustment units 4, 6 can be driven separately from each other, so that the adjustable parts of the slatted frame assigned to them can be adjusted separately from each other. In comparison to furniture drives, in which each adjustment unit is assigned a separate drive motor, essentially the same adjustment comfort is achieved. The parts of the slatted frame adjusted by means of the furniture drive 2 can be reset either when the drive is switched on by reversing the direction of rotation of the drive motor 24. However, resetting can also take place in that the drive-side clutch element is moved into an axial position between the drive-side clutch elements 32, 32 'in which the drive-side clutch element 30 is disengaged from both drive-side clutch elements 32, 32'. If the spindle drives 20, 22 or 20 ', 22' are not designed to be self-locking, the support parts of the slatted frame can then be reset by hand when the drive is switched off, the spindle nuts 22, 22 'moving back along the spindles 20, 20' their off screw gear position.

3 shows a second exemplary embodiment of a furniture drive 2 according to the invention, which differs from the exemplary embodiment according to FIG. Fig. 1 mainly differs in that the actuator means for axially displacing the drive-side coupling element 30 are designed as electromechanical actuating means. The electromechanical actuating means have an electromagnet 56, by means of which an axis 58 can be displaced to the left in FIG. 3 against the action of a compression spring 60 designed as a helical spring. The electromagnet 56 can be actuated by the user of the furniture drive 2, for example via a manual control device, for example a hand switch.

In the first clutch position shown in FIG. 3, the drive-side clutch element 30 is displaced to the left by means of the electromagnet 56 in FIG. 3 and is in engagement with the drive-side clutch element 32 of the adjusting unit

4, while the output-side coupling element 32 ′ of the adjusting unit 6 is disengaged from the input-side coupling element 30.

In order to uncouple the drive-side coupling element 30 from the output-side coupling element 32 of the adjustment unit 4 and to couple it to the output-side coupling element 32 'of the adjustment unit 6, the electromagnet is de-energized so that the compression spring 60, which is arranged coaxially on the axis 58, the Axis 58 in FIG. 3 moves to the right until the second coupling position shown in FIG. 4 is reached, in which the drive-side coupling element 30 is in engagement with the output-side coupling element 32 'of the adjusting unit 6, rend the output-side coupling element 32 of the adjusting unit 4 is disengaged from the drive-side coupling element 30.

Instead of the electromagnet, a miniaturized servomotor can also be used, by means of which the axis 58 can be displaced in the axial direction.

In addition to the clutch positions shown in FIGS. 3 and 4, the bearing axis 58 can, if necessary, also be controlled into a further clutch position in which both output-side clutch elements 32, 32 'are disengaged from the drive-side clutch element 30. In this coupling position, the parts of the slatted frame adjusted by means of the furniture drive 2 can be reset by hand, provided that the spindle drives 20, 22 or 20 ', 22' are not designed to be self-locking.

In Fig. 5, a third embodiment of a furniture drive according to the invention is shown, which differs from the embodiment of FIG. 1 mainly in that the output-side coupling elements 32, 32 'are not rotatably connected to the spindles 20, 20', but with the respective spindle 20 or 20 'are connected to a rotary drive via a gear arrangement. The gear arrangement according to the embodiment. 5 is formed by a pair of spur gears, of which one spur gear 62 or 62 'is non-rotatably connected to the spindle 20 or 20', while the other spur gear is formed by the clutch element 32 or 32 'on the output side, which is used for this purpose Purpose is provided with teeth on its radial outer surface.

The embodiment according to FIG. 5 also differs from the embodiment according to FIG. 1 in that the drive-side clutch element element 30 is arranged in a stationary manner, while the output-side coupling elements 32, 32 'designed as spur gears are axially movable. For this purpose, the coupling elements 32, 32 'on the output side are mounted at a fixed axial distance from one another on an axially movable axis 64, the axial distance between the coupling elements 32, 32' on the output side being selected such that the axis is in a first position shown in FIG 64, the output-side coupling element 32 of the first adjustment unit 4 is in engagement with the input-side coupling element 30 and the output-side coupling element 32 'of the second adjustment unit 6 is out of engagement with the input-side coupling element 30, while in a second position shown in FIG Axis 64, the output-side coupling element 32 'of the second adjustment unit 6 is in engagement with the input-side coupling element 30 and the output-side coupling element 32 of the first adjustment unit 4 is out of engagement with the input-side coupling element 30. The axis 64 is axially movably supported on bearing webs 66, 68, which are held, for example, on an inner wall of a housing 72 of the furniture drive 2.

Axial displacement of the axis 64 in FIG. 5 to the left takes place by means of the two-armed lever 42, which can be pivoted counterclockwise by means of the drawstring 48 in FIG. 5, the free end of the lever arm 44 pressing against one end of the axis 64. Fig. 5 shows the first clutch position of the clutch 28, in which the output side

Coupling element 32 of the adjustment unit 4 is in engagement with the drive-side coupling element 30. In contrast, Fig. 7 shows the second clutch position in which the output-side coupling element 32 'of the adjusting unit 6 is in engagement with the drive-side coupling element 30. For biasing the axis 64 into the first coupling position shown in FIG. 5, spring means are provided, which in this exemplary embodiment have a between one and the other

Bearing web 66 connected ball bearings 74 and a further web 76 arranged compression spring 78.

7 shows a further coupling position in which both the output-side coupling element 32 of the adjustment unit 4 and the output-side coupling element 32 ′ of the adjustment unit 6 are disengaged from the input-side coupling element 30. In order to move the shaft 64 into the corresponding axial position, a further tension band 80 can be provided which is provided with a thickening 82 which runs against a fixed stop 84 when the axis 64 is in an axial position. in which the two adjustment units 4, 6 are uncoupled from the drive motor 24. 8 shows a fourth exemplary embodiment of a furniture drive 2 according to the invention, which differs from the exemplary embodiment according to FIG. 5 differs in that the axis 64 is moved from the first coupling position shown in FIG. 8 to the second shown in FIG. 9 by means of an electromagnet

Coupling position is displaceable. The axis 64 is reset from the second coupling position into the first coupling position by means of the compression spring 78. FIG. 10 shows a fifth exemplary embodiment of a furniture drive 2 according to the invention, which differs from the exemplary embodiment according to FIG. Fig. 1 mainly differs in that the drive motor 24 is not arranged stationary, but together with the drive-side coupling element 30 is arranged on a bracket 86 movable in the axial direction of the drive-side coupling element 30. Axial displacement of the drive-side clutch element 30 together with the drive motor 24 from the first clutch position shown in FIG. 10 to the second clutch position shown in FIG. 11 is carried out by pulling the tension band 48 to the right in FIG. 10, while resetting to the first clutch position takes place under the action of two compression springs 88, 90, which are arranged between the holder 86 and a stationary part of the housing 72 of the furniture drive.

FIG. 12 shows a sixth exemplary embodiment of a furniture drive 2 according to the invention, which differs from the exemplary embodiment according to FIG. 5 primarily in that the output-side coupling elements 32, 32 'are axially displaceable separately from one another. A two-armed lever 92 is provided for axially displacing the output-side coupling element 32 of the adjustment unit 4, one lever arm 94 engaging in a circumferential groove 96 formed on the outer circumference of the output-side coupling element 32, while its other lever arm is connected to the tension band 48 , For biasing the two-armed lever 92 into the position shown in FIG. 12, a tension spring 100 is provided, which is connected via a lever 102 to the second lever arm 98 of the two-armed lever 92.

In a corresponding manner, a further two-armed lever 92 'is assigned to the output-side coupling element 32' of the adjusting unit 6, one of which lever arm 94 'engages in a circumferential groove 96' formed on the radial outer surface of the output-side coupling element 32 and the other lever arm with it a further tension band 48 'is connected.

The adjusting units 4, 6 are each assigned a further coupling element 104 or 104 ', which is arranged in the axial direction on the side of the output-side coupling element 32 or 32' facing away from the drive-side coupling element 30. In this exemplary embodiment, the respective further coupling element 104 or 104 'is connected in a rotationally fixed manner to the associated spindle 20 or 20'. The output-side coupling element 32 has on its two axial sides axial projections 106, 108 which are provided for engagement in recesses 110 and 112 of the further coupling element and of the drive-side coupling element 30 complementarily shaped to the projections 106, 108. The output-side coupling element 32 'of the adjusting unit 6 is designed in a corresponding manner, the associated reference numerals in FIG. 12 being omitted for the sake of clarity. To the output-side coupling element 32 of the

In order to bring the adjusting unit 4 into engagement with the drive-side coupling element 30, the drawstring 48 is pulled to the left in FIG. 12, so that the lever 92 pivots clockwise and the output-side coupling element 32 moves to the right in the axial direction in FIG. 12 and engages brings with the drive-side coupling element 30, as shown in Fig. 13. As can be seen from FIG. 13, the axial length of the projections 96, 108 is dimensioned such that in an axial position in which the output-side coupling element 32 is already in engagement with the input-side coupling element 30, the output-side coupling element 32 is still is in engagement with the further coupling element 104, so that in this axial position shown in FIG. 13 the further coupling element 104 is connected in a rotationally fixed manner to the coupling element 30 on the drive side. The output-side coupling element 32 is reset to the position shown in FIG. 12 under the pretension of the tension spring 100.

In a corresponding manner, the output-side coupling element 32 'of the adjustment unit 6 is axially displaced by pulling in the tension band 48 in FIG. 12 to the left until the output-side coupling element 32' comes into engagement with the further coupling element 104 'of the adjustment unit 6 and thus the adjustment unit 6 couples to the drive motor 24, as can be seen from FIG. 14. As can be seen from FIG. 14, the axial length of the axial projections on the output-side coupling element 32 'is dimensioned such that the output-side coupling element 32 is still in engagement with the input-side coupling element 30 when the output-side coupling element 32' is already there is in engagement with the further coupling element 104 '. In this axial position of the clutch element 32 'on the output side, the further clutch element 104' is connected in a rotationally fixed manner to the clutch element 30 on the drive side. 15 shows a further clutch position in which the output-side clutch element 32 is in engagement with the further clutch element 104 and the output-side clutch element 32, while the output-side clutch element 32 ′ is in engagement with the drive-side clutch element 30 and the other Coupling element 104 'is located, so that both adjustment units are coupled to the drive motor 24.

16 is another performance example of a furniture drive 2 according to the invention, which differs from the previous exemplary embodiments in that the coupling means are not designed as a coupling arrangement, but rather have a movable holder 114, on which a gear arrangement 116 is arranged. In this exemplary embodiment, the gear arrangement 116 is formed by a pair of spur gears 118, 120 which are connected in a rotationally fixed manner to a worm wheel 122 which is in engagement with the worm 26 of the drive motor 24. The drive motor 24 is also arranged on the movable holder 114 so that the worm wheel 122 always remains in engagement with the worm 26 when the holder 114 is displaced. Spur gears 124 and 124 'are connected in a rotationally fixed manner to the spindles 20, 20', the spindles 20, 20 'being parallel to one another and the spur gears 122, 122' being arranged at an axial distance from one another. In the position of the holder 114 shown in FIG. 16, the spur gear 118 of the gear arrangement 116 is in engagement with the spur gear 122 of the first adjusting unit 4, so that the spindle 20 is in rotary drive connection with the drive motor 24.

In order to move the holder 114 from the first position shown in FIG. 16 to a second position shown in FIG. 17, the holder 114, which in this exemplary embodiment is mounted in a linearly displaceable manner, is subsequently moved in FIG pulled down with spur gear 118 disengaged from spur gear 124 while the

Spur gear 120 comes into engagement with the spur gear 124 ', so that the adjusting unit 6 is then in rotary drive connection with the drive motor 24.

A provision from that shown in Fig. 17 16 into the first position shown in FIG. 16 takes place under the pretension of springs 126, 128.

In a modification of the exemplary embodiment according to FIG. 16, the holder 114 can also be arranged in a tiltable manner, as is indicated in FIG. 18.

FIG. 19 shows an eighth exemplary embodiment of the furniture drive 2 according to the invention, which differs from the exemplary embodiment according to FIG. 16 in that the holder 114 is rotatably mounted in the radius around the output shaft of the drive motor 24 and that bevel gears are used instead of spur gears 130, 132 are provided. In the position shown in FIG. 19, the drive motor 24 is in rotary drive connection with the adjustment unit 4, while in the position shown in FIG. 20 it is in rotary drive connection with the second adjustment unit 6.

Claims

claims

1. Electromotive furniture drive for adjusting parts of a piece of furniture relative to one another,

with two adjustment units which can be driven by an electric motor, each of which is in operative connection with a part of the piece of furniture to be adjusted in the assembly position of the furniture drive,

marked by

a common drive motor (24) for driving the adjustment units (4; 6) and

Coupling means which are movable between a first position and a second position and couple the drive motor (24) to the first adjustment unit (4) in the first position and to the second adjustment unit (6) in the second position and thus in drive connection with the respective one Bring the adjustment unit (4; 6).

2. Furniture drive according to claim 1, characterized in that the adjusting units (4; 6) each have a drivable drive element, the drive motor (24) in the first position of the coupling means with the drive element of the first adjusting unit (4) and in second position of the coupling means with the drive element of the second adjusting unit (6) in Rotary drive connection is established.

3. Furniture drive according to claim 2, characterized in that the rotationally drivable drive element is part of a spindle drive (20, 22; 20 ', 22') which has a linearly movable adjusting element, which in the mounting position of the furniture drive (2) with a part to be adjusted of the furniture is in operative connection.

4. Furniture drive according to claim 3, characterized in that the drive element is a fixed, rotatably mounted spindle (20; 20 '), on the non-rotatable and axially movable a spindle nut (22; 22') is arranged, which forms the adjusting element or is connected to the adjusting element.

5. Furniture drive according to claim 3, characterized in that the drive element is a fixed, rotatably mounted spindle nut which is arranged on a non-rotatable and axially movable spindle which forms the adjusting element or is connected to the adjusting element.

6. Furniture drive according to claim 3, characterized in that the linearly movable adjusting element in the mounting position of the furniture drive with a pivotably mounted shaft (10; 16) for pivoting the same is in operative connection, the shaft (10; 16) with one to be adjusted Part of the furniture is connected.

7. Furniture drive according to claim 6, characterized in that with the shaft (10; 16) a pivot lever (12; 18) is rotatably connected, which by means of the linear loading movable adjustment element is pivotable.

8. Furniture drive according to claim 2, characterized in that the coupling means have a coupling arrangement which, in a first coupling position, the drive element of the first adjustment unit (4) and in a second coupling position, the drive element of the second adjustment unit (6) to the drive motor (24 ) coupled and thus brings the drive motor (24) into rotary drive connection with the respective drive element.

9. Furniture drive according to claim 8, characterized in that the coupling arrangement has a third coupling position in which both the drive element of the first adjustment unit (4) and the drive element of the second adjustment unit (6) is coupled to the drive motor (24).

10. Furniture drive according to claim 8, characterized in that the coupling arrangement has a fourth coupling position, in which both the drive element of the first adjustment unit (4) and the drive element of the second adjustment unit (6) are uncoupled from the drive motor (24).

11. Furniture drive according to claim 8, characterized in that the coupling arrangement has at least one clutch (28).

12. Furniture drive according to claim 11, characterized in that the clutch (28) is a positive clutch.

13. Furniture drive according to claim 1, characterized gekennzeich- net, that the clutch (28) has a drive-side coupling element (30) which is connected to the drive motor (24) in rotary drive connection, and that the rotationally drivable drive elements of the adjusting units (4; 6) each have an output-side coupling element (32; 32 ' ) is assigned, the output-side coupling elements (32; 32 ') for coupling the respective adjusting unit (4; 6) to the drive motor (24) being engageable with the input-side coupling element (30).

14. Furniture drive according to claim 13, characterized in that the one adjusting unit (4; 6) associated output-side coupling element (32; 32 ') is rotatably connected to the drive element of this adjusting unit (4; 6).

15. Furniture drive according to claim 13, characterized in that the one adjusting unit (4; 6) assigned- output side coupling element (32; 32 ') via a gear arrangement with the drive element of this adjusting unit (4; 6) is in rotary drive connection.

16. Furniture drive according to claim 15, characterized in that the output-side coupling element (32; 32 ') is designed as a gear or rotatably connected to a gear that engages with a rotatably connected to the drive element gear (62; 62') stands.

17. Furniture drive according to claim 16, characterized in that the gears (62; 62 ') are spur gears.

18. Furniture drive according to claim 13, characterized is characterized in that the drive-side coupling element (30) is designed as a worm wheel or is connected in a rotationally fixed manner to a worm wheel which is in engagement with a worm (26) connected to the output shaft of the drive motor.

19. Furniture drive according to claim 13, characterized in that the drive-side coupling element (32) and / or at least one of the output-side coupling elements (32; 32 ') is or are axially movable, such that by axial movement of the drive-side coupling element (30) and / or at least one of the output-side coupling elements (32; 32 ') except the output-side coupling elements (32; 32') of the input-side coupling element (30)

Intervention or in engagement with the same can be brought.

20. Furniture drive according to claim 19, characterized in that the output-side coupling elements (32; 32 ') are arranged in a stationary manner and that the drive-side coupling element (30) is arranged in the axial direction between the output-side coupling elements (32; 32') and is axially movable.

21. Furniture drive according to claim 19, characterized in that the drive-side coupling element (30) is arranged stationary and that at least one of the output-side coupling elements (32; 32 ') is axially movable.

22. Furniture drive according to claim 21, characterized in that the output-side coupling elements (32; 32 ') are axially movable separately from each other.

23. Furniture drive according to claim 21, characterized in that the output-side coupling elements (32; 32 ') are axially movable together.

24. Furniture drive according to claim 23, characterized in that the output-side coupling elements (32; 32 ') are mounted at a fixed distance from one another on an axially movable axis (64), the axial distance between the coupling elements (32; 32') being chosen from one another is that in a first position of the axis (64) the driven-side coupling element (32) of the first adjusting unit (4) engages with the driving-side coupling element (30) and the driven-side coupling element (32 ') of the second adjusting unit (6) disengaged from the drive side

Coupling element (30), while in a second position of the axis (64) the driven-side coupling element (32 ') of the second adjusting unit (6) is in engagement with the driving-side coupling element (30) and the driven-side coupling element (32) of the first adjusting unit Engagement of the drive-side coupling element (30) is located.

25. Furniture drive according to claim 13, characterized in that at least one adjustment unit (4; 6) is assigned a further, preferably both adjustment units each have a further (104; 104 ') coupling element which is arranged in the axial direction on the coupling element on the drive side (30 ) facing away from the output-side coupling element (32; 32 ') of this adjusting unit (4, 6) and is connected to the drive element of this adjusting unit (4; 6) in a rotary drive connection, such that axial movement of the coupling element (32; 32') the further Coupling element (104; 104 ') and thus the drive element can be coupled to the drive-side coupling element (30) or can be uncoupled therefrom.

26. Furniture drive according to claim 25, characterized in that the output-side coupling elements (32; 32 ') of the adjusting units (4; 6) on their two axial sides each have axial projections (106, 108) with which they in the respective coupling position in complementary recesses

(110, 112) which are formed on the side of the drive-side clutch element (30) and the further clutch element (104; 104 ') facing the respective output-side clutch element (32; 32').

27. Furniture drive according to claim 13 or 25, characterized in that the drive-side coupling element (30) and the output-side coupling elements (32; 32 ') and possibly the further coupling elements (104; 104') are mounted coaxially.

28. Furniture drive according to claim 21, characterized in that the drive motor (24) is arranged stationary.

29. Furniture drive according to claim 21, characterized in that the drive-side coupling element (30) together with the drive motor (24) is arranged on a movable holder (86), such that the drive-side coupling element (30) together with the drive motor (24) is movable.

30. Furniture drive according to claim 29, characterized is characterized in that the holder (86) is displaceable in the axial direction of the drive-side coupling element (30).

31. Furniture drive according to claim 19, characterized by spring means for biasing the movable coupling element (30; 32; 32 ') or at least one of the movable coupling elements (30; 32; 32') in a starting position.

32. Furniture drive according to claim 19, characterized by actuating means for moving the movably mounted coupling element (30; 32; 32 ').

33. Furniture drive according to claim 2, characterized in that the drive motor (24) via a gear arrangement (116) with the drive elements of the adjusting units (4; 6) can be brought into rotary drive connection.

34. Furniture drive according to claim 33, characterized in that the coupling means have a movable bracket (114) on which at least one gear element (118, 120, 122) of the gear arrangement (116) is arranged, the bracket (114) between a first Position in which the gear arrangement (116) brings the drive element of the first adjustment unit (4) into rotary drive connection with the drive motor (24), and a second position in which the gear arrangement (116) drives the drive element of the second adjustment unit (6) brings the drive motor (24) into rotary drive connection, is movable.

35. Furniture drive according to claim 34, characterized records that the bracket (114) is linearly displaceable.

36. Furniture drive according to claim 34, characterized in that the holder (114) is rotatable or tiltable.

37. Furniture drive according to claim 35, characterized in that the gear arrangement (116) has a first and a second gear (118, 120) which are arranged in a rotationally fixed manner on a common shaft which can be driven by the drive motor (24), and in that the drive element the first adjustment unit (4) is assigned a third gear (124) and the drive element of the second adjustment unit (6) is assigned a fourth gear (124 '), the holder (114) being relative to the third and fourth gear (124; 124 ') is movable such that in the first position of the holder (114) the first gear (118) is in engagement with the third gear (124), while the second gear (120) is disengaged from the fourth gear ( 124 '), and in the second position of the holder (114) the second gear (120) is in engagement with the fourth gear (124'), while the first gear (118) is out of engagement with the third gear (124 ) is located.

38. Furniture drive according to claim 35 and 37, characterized in that the first and the second gear are bevel gears (130, 132).

39. Furniture drive according to claim 38, characterized in that the holder (114) is rotatable in the radius around the output shaft of the drive motor (24).

40. Furniture drive according to claim 37, characterized in that the drive motor (24) on the holder (114) is arranged such that the gear arrangement (116) can be moved together with the drive motor (24).

41. Furniture drive according to claim 34, characterized by spring means for biasing the holder (114) into an initial position.

42. Furniture drive according to claim 34, characterized by actuating means for moving the holder.

43. Furniture drive according to claim 32 or 42, characterized in that the actuating means are mechanical actuating means.

44. Furniture drive according to claim 43, characterized in that the mechanical actuating means have manually operable traction means.

45. Furniture drive according to claim 32 or 42, characterized in that the actuating means are electromechanical actuating means.

46. Furniture drive according to claim 44, characterized in that the electromechanical actuating means have at least one electromagnet (56).

47. Furniture drive according to claim 44, characterized in that the electromechanical actuating means have at least one servomotor.

48. Furniture drive according to claim 32 or 42, characterized by at least one two-armed lever (42), one lever arm (44) with the movable component and the other lever arm (46) with the actuating means in operative connection.

49. Furniture drive according to claim 1, characterized by switching means for switching the drive motor on and off.

50. Furniture drive according to claim 3, characterized in that the spindle drive is self-locking

51. Furniture drive according to claim 3, characterized in that the spindle drive (20, 22; 20 '22') is not self-locking.

52. Furniture drive according to claim 1, characterized by control means for controlling the direction of rotation of the drive motor.