Electomotive furniture drive

Abstract

The invention relates to an electromotive furniture drive (14) for adjusting furniture components, which can be adjusted relative to one another, of an item of sitting and / or lying furniture, the electromotive furniture drive comprising an electromotive drive device (16) which has a control device and has a first drive train (18) with a first output member and a second drive train (20) with a second output member. The drive trains (18, 20) are designed and configured such that: - the first output member can be moved between a starting position (cf. 1) and a final position (cf. 1) of the adjustment movement and, during the movement between the starting position and the final position, carries out a first adjustment stroke, and the second output member can be moved between a starting position and a final position of the adjustment movement and, during the movement between the starting position and the end position, carries out a second adjustment stroke; and - the first adjustment stroke and the second adjustment stroke are of different magnitudes.

Description

[0001] Electromotive furniture drive

[0002] The invention relates to an electromotive furniture drive for adjusting furniture components of a seating and / or reclining furniture that are adjustable relative to one another.

[0003] Furniture drives are well known and are used, for example, to adjust the headboard and / or footboard of a slatted frame. The furniture drive can be integrated into a piece of furniture, as is known, for example, from DE 199 62 541 A1 and DE 100 46 751 A1. However, the furniture drive can also be designed as an add-on component to a piece of furniture, as is known, for example, from DE 38 42 078 C1.

[0004] For adjusting slatted frames, for example, so-called double drives are known. These have a housing designed as a separate component that can be connected to the slatted frame and in which two adjustment units are accommodated, one of which serves, for example, to adjust a back support part and the other to adjust a leg support part of the slatted frame. The adjustment units in the known double drives are designed as spindle drives, with the drive coupling to a support part to be adjusted via a linkage lever that is non-rotatably connected to a pivot shaft assigned to the support part to be adjusted.

[0005] When the support part is rotated, the spindle nut of the spindle drive presses against the linkage lever, pivoting the pivot shaft and thus the support part. Such dual drives are known, for example, from EP 0 372 032 A1 and DE 38 42 078 A1.

[0006] DE 100 17 989 C2 and DE 100 17 979 C2 each disclose a furniture drive designed as a double drive, in which each adjustment unit has an electric motor-driven winding device for a rope, belt or chain-shaped traction means, which is connected in the manner of a pulley to a pivoting lever which is connected in a rotationally fixed manner to a pivoting shaft which in turn is operatively connected to a support part to be adjusted.

[0007] Furniture drives operating according to a similar principle are also known from DE 34 09 223 C2, DE 198 43259 C1 and EP 1 020 171 A1.

[0008] Double drives operating according to different operating principles are also known from DE 197 292812 A1, DE 298 11 566 U1 and DE 297 14 746 U1.

[0009] The invention is based on the object of providing a furniture drive that enables extended adjustment functionalities.

[0010] This object is achieved by the invention defined in claim 1.

[0011] The invention provides an electromotive furniture drive for adjusting furniture components of a seating and / or reclining furniture that are adjustable relative to one another, which comprises an electromotive drive device having a control device, which has a first drive train with a first output element and a second drive train with a second output element. According to the invention, the drive trains are designed and configured such that

[0012] - the first output element is movable between a starting position and an end position of the adjustment movement and executes a first adjustment stroke during the movement between the starting position and the end position; and the second output element is movable between a starting position and an end position of the adjustment movement and executes a second adjustment stroke during the movement between the starting position and the end position; and the first adjustment stroke and the second adjustment stroke are of different sizes. The invention provides an electromotive furniture drive with two output elements that have adjustment strokes of different sizes between a starting position and an end position of the adjustment movement.According to the invention, the adjustment stroke is understood to mean the travel path that an output member executes between a starting position and an end position of the adjustment movement, for example and in particular translationally along a translation axis.

[0013] Preferably, the adjustment stroke of one output element is significantly greater than the adjustment stroke of the other output element. In other words, the travel distances of the output elements vary during the adjustment movement. This enables new adjustment kinematics and applications for the adjustment of furniture components in which three furniture components are adjusted relative to each other. By selecting the appropriate adjustment strokes, the resulting kinematics of the adjustment movement can be selected within wide limits.

[0014] The furniture drive according to the invention can be used in a variety of furniture with adjustable furniture components. The furniture drive according to the invention is particularly well suited for seating and / or reclining furniture with a stand-up aid. In this case, the furniture drive according to the invention can be used to adjust a seat of the furniture from a sitting position, in which the seat is arranged essentially horizontally, to a stand-up position, in which the seat is raised, shifted forward, and tilted. An anatomically and ergonomically "correct" kinematics with regard to a stand-up process takes place in such a way that the seat is first slightly raised and then shifted forward and tilted. Such kinematics can be easily implemented using a furniture drive according to the invention.

[0015] Depending on the respective requirements and conditions, the size of the second adjustment stroke can be selected within wide limits in relation to the size of the first adjustment stroke. An advantageous development of the invention provides that the second adjustment stroke is at least approximately 50%, preferably approximately 100%, greater than the second adjustment stroke.

[0016] The furniture drive according to the invention can, in principle, be designed such that the output elements sequentially complete the respective associated adjustment stroke. An advantageous development of the invention provides that the drive device is configured such that the output elements simultaneously complete the respective associated adjustment stroke between the starting position and the end position of the adjustment movement.

[0017] In the interest of a simple and cost-effective design, an advantageous development of the invention provides that the output elements are connected to a common electric motor for driving purposes. In this embodiment, the drive device comprises a (single) common electric motor that is connected to the output elements for driving purposes.

[0018] Another advantageous development of the invention provides that the output elements are each translationally movable along a translation axis. In this embodiment, the drive trains are each designed as linear drives. Corresponding linear drives are available as relatively simple and inexpensive standard assemblies and are suitable for applying large adjustment forces, such as those required, for example, to create a piece of furniture with a stand-up aid, in which the adjustment of a seat occurs under the weight of a person sitting on the seat.

[0019] In the interests of a simple and robust design of the furniture drive according to the invention, it is advantageous if the drive trains each have a spindle drive, as provided for in a further development of the invention. Corresponding spindle drives are relatively simple in design and inexpensive, as well as suitable for applying large adjustment forces. In this sense, an advantageous further development of the aforementioned embodiment provides that the first drive train has a first spindle drive with a first threaded spindle and a first spindle nut mounted on the first threaded spindle, and the second drive train has a second spindle drive with a second threaded spindle and a second spindle nut mounted on the second threaded spindle.

[0020] In the interests of a simple and compact design, an advantageous further development of the embodiment with the spindle drive provides that the output element of each drive train is formed by the spindle nut, wherein the spindle nut is arranged on the associated threaded spindle in a rotationally secure manner and movable in the axial direction. With regard to the implementation of the different adjustment strokes of the output elements of the drive trains provided for by the invention, a variety of possibilities arise. For example, each drive train with a spindle drive can be assigned a separate electric motor, wherein the electric motors are operated at different speeds during adjustment, so that the threaded spindles of the drive trains rotate at different speeds according to the different motor speeds.This results in different adjustment strokes of the spindle nuts as output elements, provided that the threaded spindles of the spindle drives have the same pitch.

[0021] According to the invention, it is also fundamentally possible, for example, to drive the threaded spindles of the drive trains by one and the same electric motor and to realize different speeds of the threaded spindles and thus (assuming the same pitch of the threaded spindles) different adjustment strokes by means of different transmission ratios of gears acting between the output shaft of the electric motor and the threaded spindles.

[0022] In order to achieve different adjustment strokes with a simple and cost-effective design when using a single common electric motor or when using separate electric motors with the same speed assigned to the drive trains, an extremely advantageous development of the invention provides for the threaded spindles to have different pitches. With the same speed of the threaded spindles, the different pitches result in the different adjustment strokes provided by the invention, whereby the ratio of the adjustment strokes to one another can be selected by the ratio of the pitches of the threaded spindles to one another.

[0023] According to the invention, in the embodiments with spindle drives, one of the threaded spindles can have a right-hand thread and the other threaded spindle a left-hand thread. To ensure that the output elements move in the same direction during the adjustment movement, which is advantageous for certain applications, another advantageous development of the invention provides for both threaded spindles to have a right-hand thread or a left-hand thread.

[0024] As explained above, at least one separate electric motor can be assigned to each drive train. Accordingly, an advantageous development of the invention provides that the first drive train has a first electric motor and the second drive train has a second electric motor, wherein the control device controls the electric motors such that, between the starting position and the end position of the adjustment movement, the first drive train executes the first adjustment stroke and the second drive train executes the second adjustment stroke.

[0025] An exceptionally advantageous development of the invention provides that the threaded spindles are connected to one another in a rotationally fixed manner and are connected to the shared electric motor for rotary drive. This embodiment has the advantage that a single electric motor is sufficient to drive both spindle drives, thus resulting in a particularly simple and therefore cost-effective design. As explained above, with this embodiment, different adjustment strokes can be achieved by varying the pitch of the threaded spindles.

[0026] Another advantageous development of the invention provides for the drive trains to be housed in a common drive housing. This creates a furniture drive that is easy to handle and install.

[0027] A piece of furniture according to the invention, in particular a seating and / or reclining piece of furniture, with a stand-up aid is specified in claim 14. The piece of furniture according to the invention comprises a base body, a backrest part, and a seat part, wherein the seat part is movable relative to the base body and the backrest part between a sitting position and a standing position by means of at least one electric motor-driven furniture drive. In contrast, for example, to known armchairs with a stand-up aid, in the piece of furniture according to the invention, only the seat part is moved as a stand-up aid, while the base body with the backrest remains stationary during use of the stand-up aid.

[0028] An advantageous development of the furniture according to the invention provides that an operative connection between the furniture drive, the seat part and the base body is designed in such a way that, starting from a starting position of the adjustment movement, which corresponds to a sitting position and in which the seat part is arranged substantially horizontally, for adjustment to an end position of the adjustment movement, which corresponds to a standing-up position, the seat part is raised and displaced away from the backrest part and tilted away from the backrest part.

[0029] Another advantageous development of the furniture according to the invention provides that the furniture has at least one electromotive furniture drive according to the invention according to one of claims 1 to 13 with a drive housing.

[0030] An advantageous development of the aforementioned embodiment provides that the drive housing is pivotably mounted on the base body about a pivot axis, and the first output element cooperates with a component, in particular a pin, arranged eccentrically to the pivot axis on the base body to pivot the drive housing relative to the base body. In this embodiment, the pivoting of the base body about the pivot axis can be achieved using short lever arms, resulting in a flat and compact design. In this way, various pieces of furniture can be equipped with a stand-up aid with little additional space required.

[0031] An advantageous further development of the aforementioned embodiment provides that the first output member is designed as a pressure piece.

[0032] Another advantageous development of the furniture according to the invention provides that a pivot lever, which supports the seat part, is mounted on the drive housing so as to be pivotable about a further pivot axis. The second output element cooperates with the pivot lever to pivot the pivot lever relative to the drive housing. This embodiment is also advantageous in terms of a compact and flat design using short lever arms.

[0033] In the aforementioned embodiment, the adjustment-related coupling of the second output element to the pivot lever can be achieved in different ways. To further simplify and cost-effectively design the furniture according to the invention provides that one end of a bracket is articulated to the second output element, the other end of which is articulated and connected to the pivot lever eccentrically with respect to the further pivot axis. In the aforementioned embodiment, the second output element is advantageously designed as a tension member, as provided for in one advantageous embodiment.

[0034] The invention is explained in more detail below using an exemplary embodiment with reference to the attached schematic drawing. All features described, illustrated in the drawing, and claimed in the patent claims, taken individually and in any technically reasonable combination with one another, constitute the subject matter of the invention, regardless of their summary in the patent claims and their references, as well as regardless of their specific description or representation in the drawing. The subject matter and disclosure content of the present application also include subcombinations of the patent claims in which at least one feature of the respective patent claim is omitted or replaced by another feature.It is obvious to the person skilled in the art that the individual features disclosed in the embodiment further develop the embodiment in themselves, i.e. independently of the other features of the embodiment.

[0035] It shows:

[0036] Fig. 1 in a schematic perspective view a

[0037] Embodiment of a piece of seating furniture according to the invention in the form of an armchair with an embodiment of a furniture drive according to the invention, wherein Fig. 1 shows the armchair in an unadjusted starting position of the adjustment movement, which corresponds to a sitting position,

[0038] Fig. 2 shows a perspective view of the furniture drive according to Fig. 1 taken on its own, Fig. 3.1 and Fig. 3.2 each show a perspective view of details of a drive device of the furniture drive according to Fig. 2 in the sitting position,

[0039] Fig. 4.1 and Fig. 4.2 in the same representation as Fig. 1 and in two different perspective views, the chair according to Fig. 1 in an end position of the adjustment movement, which corresponds to a standing-up position and

[0040] Fig. 5.1 to Fig. 5.3 Details of the drive device according to Fig. 3.1 and Fig. 3.2 in the standing position.

[0041] An exemplary embodiment of a piece of seating and / or reclining furniture according to the invention with a stand-up aid, as well as an exemplary embodiment of a furniture drive according to the invention, are explained in more detail below with reference to Fig. 1 to Fig. 5.3. For the sake of clarity and to simplify the illustration, components of the seating and / or reclining furniture and the furniture drive have been omitted from certain figures of the drawing. The omitted components are to be added in the relevant figures in a conceptual manner.

[0042] Fig. 1 shows an embodiment of a piece of seating and / or reclining furniture according to the invention, which is shown purely schematically and exemplarily as an armchair 2. However, the piece of seating and / or reclining furniture according to the invention can also be any other piece of furniture, in particular a piece of furniture with a stand-up aid, for example a sofa or a lounger.

[0043] The chair 2 has a base body 4 with two side parts 6, 8, which are connected to each other by a front panel 10. A backrest part is arranged at the ends of the side parts 6, 8 facing the front panel 10; this backrest part is not shown in the drawing to simplify the illustration.

[0044] The chair 2 further comprises a seat part 12 which can be adjusted between a starting position of the adjustment movement shown in Fig. 1, in which the seat part 12 is in the io

[0045] is arranged substantially horizontally and is adjustable to an end position which is shown in Fig. 4.1 and Fig. 4.2 and which corresponds to a standing position.

[0046] An anatomically "correct" standing-up process occurs when a person sitting on the chair 2 first raises their buttocks and then shifts their center of gravity forward until the center of gravity is above or approximately above the knees. The chair according to the invention supports this movement by using a furniture drive to initially slightly raise the seat portion 12 from the initial position of the adjustment movement and then shift it forward and tilt it away from the backrest portion. Fig. 4.1 and Fig. 4.2 show the resulting final position of the adjustment movement.

[0047] It is evident that in this way a standing aid is realized in which only the seat part is moved relative to the base body 4, while the base body 4 together with the backrest part remains stationary during the adjustment movement.

[0048] In the illustrated embodiment, the standing aid is implemented by means of an embodiment of a furniture drive 14 according to the invention, which is shown separately in Fig. 2. The furniture drive 14 has two drive devices (drive units) 16, 16', wherein the drive device 16 is provided with an electric motor, while the drive device 16' is a motorless drive device. This will be explained in more detail below.

[0049] The drive device 16 is explained in more detail below with reference in particular to Fig. 3.1, Fig. 3.2 and Fig. 5.1 to Fig. 5.3.

[0050] The drive device 16 has a first drive train 18 with a first output member and a second drive train 20 with a second output member.

[0051] To control the drive device 16, a control device is provided, which is not shown in the drawing to simplify the illustration. The structure of a corresponding control device is generally known to those skilled in the art, both in terms of hardware and software, and will therefore not be explained in detail here. According to the invention, the drive trains 18, 20 are designed and configured such that

[0052] - that the first output member is movable between a starting position and an end position of the adjustment movement and executes a first adjustment stroke during the movement between the starting position and the end position, and that the second output member is movable between a starting position and an end position of the adjustment movement and executes a second adjustment stroke during the movement between the starting position and the end position, and

[0053] - that the first adjustment stroke and the second adjustment stroke are different sizes.

[0054] In the illustrated embodiment, the first drive train 18 has a first spindle drive 22 with a first threaded spindle 24 and a first spindle nut 26 mounted on the first threaded spindle 24, while the second drive train 20 has a second spindle drive 28 with a second threaded spindle 30 and a second spindle nut 32 mounted on the second threaded spindle 30. The spindle nuts 26 and 32 each form the output element of the first drive train 18 and the second drive train 20, respectively. They are mounted in a drive housing 34 of the drive device 16 in a manner that is secure against rotation and movable in the axial direction of the associated threaded spindle 24 or 30. The axis of rotation of the threaded spindle 24 or 30 each defines a translation axis along which the spindle nuts 26 and 32 are translationally movable (see in particular Fig. 3.1).

[0055] In the illustrated embodiment, the threaded spindles 24, 30 are connected to one another in a rotationally fixed manner via a first worm gear 36 and both have a right-hand thread. Furthermore, in this embodiment, the threaded spindles 24, 30 have a different pitch such that the pitch of the second threaded spindle 30 is twice or approximately twice as large as the pitch of the first threaded spindle 24. Accordingly, the adjustment stroke of the second spindle nut 32, as the output element of the second spindle drive 28, is twice as large as or approximately twice as large as the adjustment stroke of the first spindle nut 26 of the first spindle drive 22.

[0056] A single or single common electric motor 38 (see Fig. 3.2) serves as the rotary drive for the threaded spindles 24, 30, which is accommodated in a motor housing 40 that is fastened to the drive housing 34 of the drive device 16 (see Fig. 3.1).

[0057] The first worm gear 36, via which the threaded spindles 24, 30 are connected to one another in a rotationally fixed manner, engages with a first worm 42, which is connected to a second worm gear 44, which engages with a second worm 46 integrally formed on the output shaft of the electric motor 38. In this way, the threaded spindles 24, 30 are in a rotationally drive connection with the electric motor 38 and, when the electric motor 38 is running, are driven synchronously at the same speed and in one or the other direction of rotation depending on the direction of rotation of the output shaft of the electric motor 38. Depending on the direction of rotation of the threaded spindles 24, 30, the spindle nuts 26, 32 move in the same direction in one or the other direction along their translational axis.

[0058] The drive device 16' is constructed similarly, with the difference that it is motorless, and the drive torque of the electric motor 38 is transmitted from the drive device 16 to the drive device 16' via a shaft. The shaft 48 is connected at one end in a rotationally fixed manner to the second worm gear 44 of the drive device 16 and at the other end in a rotationally fixed manner to a corresponding worm gear of the drive device 16', so that the drive devices 16, 16' are driven synchronously by the electric motor 38.

[0059] The drive housing 34 is pivotally connected about a pivot axis 50 to a metal fitting 52 (see Fig. 3.2), which is fastened to the side part 6 (see Fig. 4.1). By means of the fitting 52, the drive housing 34 is connected for adjustment to the base body 4 of the chair 2. In a corresponding manner, the drive housing 34' of the drive device 16' is connected to a metal fitting 54 (see Fig. 4.1 and Fig. 4.2) and fastened to the side part 8. The fitting 52 has a pin 56 eccentric to the pivot axis 50, against which the first spindle nut 26, acting as a pressure piece, rests.

[0060] Starting from the initial position of the adjustment movement shown in Fig. 3.1, the electric motor 38 drives the first threaded spindle 24 such that the first spindle nut 26 moves to the left in Fig. 3.1 and presses against the pin 56. In this process, the drive housing 34 is pivoted counterclockwise about the pivot axis 50 in Fig. 3.1 until the end position of the adjustment movement shown in Fig. 5.1 is reached. Fig. 5.3 shows, on a larger scale than in 5.1, the adjustment connection of the first spindle drive 22 to the base body 4 of the chair 2.

[0061] An angled pivot lever 60 is pivotably connected to the drive housing 34 about a further pivot axis 58, which supports the seat surface part 12 on the upper side of its end facing away from the further pivot axis 58. One end of a bracket 62 is pivotally connected to the second spindle nut 32 as the output element of the second drive train 20, the other end of which is pivotally connected to the pivot lever 60 and eccentrically connected to the further pivot axis 58.

[0062] The second spindle nut 32 is designed as a tension member in the illustrated embodiment. Starting from the initial position of the adjustment movement shown in Fig. 3.1, the electric motor 38 drives the second threaded spindle 30 such that the second spindle nut 32 moves to the left in Fig. 3.1 and pulls on the tab 62, causing the pivot lever 60 to pivot clockwise in Fig. 3.1 about the additional pivot axis 58 until the end position of the adjustment movement shown in Fig. 5.1 is reached. Accordingly, the seat surface part 12 connected to the pivot lever 60 is also pivoted about the additional pivot axis 58 relative to the drive housing 34.

[0063] Fig. 5.2 shows the adjustment connection of the second spindle drive 28 to the pivot lever 60.

[0064] Since the threaded spindles 24, 30 are driven synchronously by the electric motor 38, the spindle nuts 26, 32 move simultaneously, so that the kinematics with which the pivoting lever 60 is pivoted relative to the drive housing 34 are superimposed on the kinematics with which the drive housing 34 is pivoted relative to the base body 4 of the chair 2. Due to the approximately twice as large pitch of the second threaded spindle 30 between the starting position (see Fig. 3.1) of the adjustment movement and the end position of the adjustment movement (see Fig. 5.1), the second spindle nut 32 executes an adjustment stroke that is approximately twice as large as the adjustment stroke of the first spindle nut 26.In combination with the previously described superposition of the kinematics, this results in an anatomically “correct” kinematics of the stand-up aid, in that the seat part 12 is first slightly raised and then shifted and tilted forward, i.e. away from the backrest part.

[0065] In this way, an effective and anatomically and ergonomically favorable standing aid is realized using simple means.

[0066] The return from the end position of the adjustment movement shown in Fig. 5.1 back to the starting position of the adjustment movement shown in Fig. 3.1 takes place when the drive device 16 is switched on, but under the weight of the seat part 12.

[0067] In the illustrated embodiment, the furniture drive 14 has two drive units or drive devices 16, 16' spaced apart transversely to the longitudinal direction of the chair 2. This has the advantage that the adjustment force is introduced symmetrically into the seat part 12 transversely to the longitudinal center plane of the chair 2, thus preventing distortion of the seat part 12 during adjustment. In principle, the use of a single drive unit or drive device is also possible, which is then arranged in the longitudinal center plane of the chair 2.

[0068] Starting from the end position of the adjustment movement shown in Fig. 4.1 and thus the standing-up position of the seat part 12, the standing-up aid can also be used in the opposite direction as a “sitting-down aid” to make it easier for a person to sit down on a low-lying seat of a piece of furniture, for example when sitting down on a sofa.

[0069] In particular, it can be seen from Fig. 3.1 and Fig. 5.1 that the furniture drive 14 according to the invention requires short lever arms. This allows the furniture drive 14 to be designed flat with a low overall height, which significantly facilitates installation or integration into a piece of furniture without compromising the design of the furniture, as is the case with prior art TV armchairs, which often have a bulky and unsightly appearance. This opens up new possibilities both in terms of design and technical implementation, particularly for realizing furniture with a stand-up aid.

[0070] Reference symbol list for AZ OAC240404PCT

[0071] Armchair

[0072] Main body Side part Side part Front panel Seat part Furniture drive Drive device Drive train Drive train First spindle drive First threaded spindle First spindle nut Second spindle drive Second threaded spindle Second spindle nut

[0073] Drive housing first worm gear electric motor motor housing first worm second worm gear second worm shaft

[0074] Swivel axis

[0075] Fitting Fitting Pin 58 additional pivot axis

[0076] 60 swivel levers

[0077] 62 tab

Claims

Patent claims 1 . Electromotive furniture drive (14) for adjusting furniture components of a seating and / or reclining furniture that are adjustable relative to one another, with an electromotive drive device (16) having a control device, which has a first drive train (18) with a first output member and a second drive train (20) with a second output member, wherein the drive trains (18, 20) are designed and arranged such that - the first output member is movable between a starting position and an end position of the adjustment movement and executes a first adjustment stroke during the movement between the starting position and the end position, and the second output member is movable between a starting position and an end position of the adjustment movement and executes a second adjustment stroke during the movement between the starting position and the end position, and the first adjustment stroke and the second adjustment stroke are of different sizes.

2. Furniture drive according to claim 1, wherein the second adjustment stroke is at least approximately 50%, preferably at least approximately 100% greater than the second adjustment stroke.

3. Furniture drive according to claim 1 or 2, wherein the drive device (16) is designed and arranged such that the output members execute the associated adjustment stroke between the starting position and the end position of the adjustment movement simultaneously.

4. Furniture drive according to one of the preceding claims, wherein the output members are in drive connection with a common electric motor (38).

5. Furniture drive according to one of the preceding claims, wherein the output members are each translationally movable along a translation axis.

6. Furniture drive according to one of the preceding claims, wherein the first drive train has a first spindle drive (22) with a first threaded spindle (24) and a first spindle nut (26) placed on the first threaded spindle (24) and the second drive train (20) has a second spindle drive (28) with a second threaded spindle (30) and a second spindle nut (32) placed on the second threaded spindle (30).

7. Furniture drive according to claim 6, wherein the output member of each drive train (18 or 20) is formed by the respective spindle nut (26 or 32), wherein the spindle nuts (26 or 32) are each arranged on the associated threaded spindle (24 or 30) in a rotationally secure manner and movable in the axial direction.

8. Furniture drive according to claim 6 or 7, wherein the threaded spindles (24, 30) have a different pitch.

9. Furniture drive according to one of claims 6 to 8, wherein both threaded spindles (24, 30) have a right-hand thread or a left-hand thread.

10. Furniture drive according to one of claims 6 to 8, wherein the first drive train has a first electric motor and the second drive train has a second electric motor.

11. Furniture drive according to claim 10, wherein the control device controls the electric motors such that between the starting position and the end position of the adjustment movement, the first output member executes the first adjustment stroke and the second output member executes the second adjustment stroke.

12. Furniture drive according to claim 4 and one of claims 6 to 9, wherein the threaded spindles (24, 30) are connected to one another in a rotationally fixed manner and are in rotational drive connection with the common electric motor (38).

13. Furniture drive according to one of the preceding claims, wherein the drive trains are accommodated in a common drive housing (34).

14. Furniture, in particular seating and / or reclining furniture, with a stand-up aid, with a base body (4), with a backrest part and with a seat part (12), where- wherein the seat part (12) is movable relative to the base body (4) and the backrest part by means of at least one electromotive furniture drive (14).

15. Furniture according to claim 14, wherein an operative connection between the furniture drive (14), the seat surface part (12) and the base body (4) is set up in such a way that, starting from a starting position of the adjustment movement, which corresponds to a sitting position and in which the seat surface part (12) is arranged substantially horizontally, for adjustment into an end position of the adjustment movement, which corresponds to a standing-up position, the seat surface part (12) is raised and displaced away from the backrest part and tilted away from the backrest part.

16. Furniture according to claim 14 or 15, which has at least one electromotive furniture drive (14) according to one of claims 1 to 10 with a drive housing.

17. Furniture according to claim 16, wherein the drive housing (34) is mounted on the base body (4) so ​​as to be pivotable about a pivot axis (50) and the first output member for pivoting the drive housing relative (34) to the base body (4) cooperates with a component, in particular a pin (56), arranged eccentrically to the pivot axis (50) on the base body (4).

18. Furniture according to claim 17, wherein the first output member is designed as a pressure piece.

19. Furniture according to one of claims 16 to 18, wherein a pivot lever (60) is mounted on the drive housing (34) so ​​as to be pivotable about a further pivot axis (58), which pivot lever carries the seat part (14), wherein the second output member for pivoting the pivot lever (60) relative to the drive housing (34) cooperates with the pivot lever (60).

20. Furniture according to claim 19, wherein one end of a tab (62) is articulated to the second output member, the other end of which is articulated and eccentrically connected to the pivot lever (60) with respect to the further pivot axis (58).

21. Furniture according to claim 17, wherein the second output member is designed as a pull piece.

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