EP2677899A1

EP2677899A1 - Electromotive furniture drive

Info

Publication number: EP2677899A1
Application number: EP12705686.9A
Authority: EP
Inventors: Armin Hille
Original assignee: Dewertokin GmbH
Current assignee: Dewertokin GmbH
Priority date: 2011-02-25
Filing date: 2012-02-24
Publication date: 2014-01-01
Anticipated expiration: 2032-02-24
Also published as: DE202011000443U1; CN203789529U; EP2677899B1; WO2012113912A1

Abstract

The invention relates to an electromotive furniture drive (1) comprising an energy supply device (5), a manual operation unit (7) and a mains isolation device (9), which can be switched from a deactivated state into an activated state and back, for adjusting movable furniture components relative to one another, wherein the electromotive furniture drive (1) comprises at least one reversible electric motor, wherein a speed-reducing gear mechanism is connected downstream of each electric motor, and wherein a further gear mechanism is connected downstream of each speed-reducing gear mechanism, and wherein the energy supply device (5) has a mains connection which is designed so as to be connectable to the mains by means of the mains isolation device (9), wherein the energy supply device (5) transforms the mains-side input voltage into at least one output-side low voltage, and comprises an isolation transformer or a transmission unit for the electrical isolation between the on-grid input side and the low voltage-delivering output side for operating the electromotive furniture drive (1), wherein the mains isolation device (9) comprises an auxiliary supply device (21), at least one mains disconnect switch (20), which opens in the deactivated state and is closed in the activated state, and a chargeable auxiliary power accumulator (27), wherein the auxiliary power accumulator (27) is decoupled from the energy supply device (5), connected to the auxiliary supply device (21) and can be charged by the auxiliary supply device (21).

Description

ELECTROMOTIC FURNITURE DRIVE

The invention relates to an electromotive furniture drive with a power supply device for adjusting movable furniture components relative to each other.

Such electromotive furniture drives are known in different embodiments. They are designed as linear drives with a linearly adjustable output member or as rotary drives with a rotating output member and have proven themselves in practice. The linear drives have one or a number of electric motors, wherein each motor is followed by a Drehzahlreduziergetriebe and another the Drehzahlreduziergetriebe downstream transmission, for example in the form of a threaded spindle gear, which generates a linear movement of the driven member from the rotational movement of the motor. The rotary drives have at least one speed reduction gear connected downstream of the respective electric motor, with the last gear element forming the driven element. The output member of the respective electromotive furniture drive communicates with a fixed and / or with a movable furniture component, so that during an operation of the electric motor, the movable furniture components are adjusted relative to each other. The furniture can be used as a slatted frame, worktable, bed, lying surface, treatment bed, hospital or nursing bed, as well as one

Lifting device be designed for persons such as lifters or patient lifts.

It is customary to provide such electromotive furniture drives with a so-called power cut, which separates them when not in use more or less from the electrical supply network. To operate such a mains isolation, a so-called auxiliary voltage source is required, which provides an electrical energy for switching or at least initiating a changeover from a switched-off idle state to a switched-on operating state for triggering the switching signals.

DE 41 39 647 A1 describes batteries, rechargeable batteries or electrolytic capacitors as auxiliary voltage sources, which are either charged manually or recharged by switching on the entire furniture drive control. If recharging or replacement of the batteries is not completed on time, the system that has been switched off can not be restarted, leaving the mains disconnection in the switched-off state. Solutions in the form of manual emergency actuations have been specified. Further possible solutions are described in EP 0 792 533 B1 in the form of an emergency charging system, wherein an auxiliary capacitor with a low capacity is charged by a type of power supply, which is used to initiate the switching operation of a semiconductor circuit breaker (triac). The emergency charging system is always connected to the mains and actively switched on. When activated, the readiness to operate results only after a relatively long waiting time of approx. 10 to 20 seconds. Then, the entire electromotive furniture drive must first be put into operation to charge a working capacitor used as an auxiliary power source. It is still discussed the state of the art of a power-off switch or a parent mains isolation. The mains isolator, eg an apartment, is inserted between the housing installation and the public power grid and detects whether an electrical consumer, eg light, is on or off. With the housing installation is meant the electrical wiring of the apartment for the mains voltage. As soon as no electrical consumer is switched on, the mains isolator disconnects the residential installation from the public power grid. Then the mains circuit breaker generates a test voltage, eg a harmless DC voltage of a certain height, and switches this to the housing installation. If a consumer is now switched on, this detects the test voltage and causes the mains isolator to reconnect the residential installation to the public power grid. Such a power switch can also be used in areas or in each case for a room.

The invention is therefore an object of the invention to provide an improved elektromotori- see furniture drive with a mains isolation device.

The object is achieved by an electromotive furniture drive with the features of claim 1. The electromotive furniture drive has an auxiliary power storage, which is decoupled from the power supply device, connected to the auxiliary supply device and can be charged by the auxiliary supply device.

On the one hand, this results in complete freedom from maintenance, ie no batteries to be replaced are required. On the other hand, a recharging of the auxiliary power storage takes place decoupled from the power supply device. Thus, a commissioning of the entire electromotive furniture drive is not required because in a reloading process only the Hilfsversorgungseinrich- is put into operation, while the mains disconnect switch maintains the off state of the Netzfreischaltungseininnchtung.

Accordingly, an electromotive furniture drive with a power supply device of a manual control and with a Netzfreischaltungseinflighting, which is switched from a switched-off state to a switched-state and back, provided for adjusting movable furniture components relative to each other, wherein the electromotive furniture drive comprises at least one reversible electric motor, wherein each electric motor is followed by a speed reduction gear and wherein each speed reduction gear is followed by another gear, and wherein the power supply device has a network connection which is connectable to the network by the Netzfreischaltungseininnchtung, wherein the power supply device, the network-side input voltage in at least one output side Transformed low voltage, and an isolation transformer or a transmission unit for galvanic separation between the mains-side input side and the low-voltage output side for operating the electromotive furniture drive, wherein the Netzfreischaltungseininnchtung an auxiliary supply device, at least one power disconnect switch, which is opened in the off state and closed in the on state, and a chargeable Hilfsleistungsspei- rather. The electromotive furniture drive has a decoupled from the power supply auxiliary power storage, which is connected to the auxiliary supply device and can be charged by the auxiliary supply device. The Netzfreischaltungseinnchtung has another state ready for operation, in which the auxiliary supply device is connected to the network and the mains disconnector is open. This results in a lower consumption of electrical energy. The Netzfreischaltungseinignchtung cooperates with all parent Netzfreischaltern and has an auxiliary voltage source in the form of the auxiliary supply device for reconnecting the power disconnect switch, wherein an auxiliary power storage is provided, which is designed as a capacitor of high capacity. It is galvanically isolated from the mains and is charged by the auxiliary supply device separately and independently of the power supply device, ie by a main transformer. The auxiliary supply device is a transformer, a miniature switching power supply, an active optocoupler with a photovoltaic output, a light bulb solar cell unit, etc., wherein these are known from the Auxiliary power supply device formed for charging the auxiliary power memory by pressing the manual control or other switch, as will be explained in more detail below by switch 2 or switch 3, is activated. Activation is defined by two options:

1 . Connecting the auxiliary supply device to the mains

2. Switching on / releasing / unlocking a control module of the auxiliary supply device designed as a switched-mode power supply unit The auxiliary supply device is activated by three (at least two) switches acting in parallel:

Switch 1 is the manual control button. Upon actuation, a circuit of hand-held pushbutton auxiliary power storage coupler is closed. The coupling device connects the auxiliary supply device to the network.

Switch 2 is an interval switch for cyclically charging the auxiliary power storage. Switch 3 is a threshold or event switch, for initial startup, or simply a push button.

The auxiliary power memory provides a stored auxiliary power, with which the mains isolation device can be switched from the switched-off state into the further state ready for operation. For this purpose, only a small amount of power has to be expended, since the mains disconnector is not activated or fed by the auxiliary power storage.

Thus, it is provided that the auxiliary power storage can be connected to a coupling device, wherein the coupling device is provided for connecting the auxiliary supply device to the network. As a result, the auxiliary supply device is switched on by means of low power, which in turn provides the power required for switching the mains circuit breaker. The auxiliary supply device comprises in one embodiment a transformer or a high-frequency transformer. To connect the auxiliary supply device to the network is in this first embodiment, the coupling device with a switch, for example in the form of an electromechanical switch or a semiconductor switch or another coupling element is provided, which connects the network electrically conductively connected to at least one terminal of the primary winding of the transformer of the auxiliary supply device.

In another embodiment, the auxiliary supply device has another transformer, for example a high-frequency transformer, an electronic transformer or a voltage converter, which is operated by a clock-generating control component of a DC link with a high switching frequency. The intermediate circuit essentially consists of a high-frequency semiconductor switch which is driven at high frequency and switches energy from the network to at least one terminal of the primary winding to the high-frequency transformer, and a control module which drives the high-frequency semiconductor switch via its output, and a signal feedback, for example as Optocoupler is formed and is electrically connected to the input of the control module. According to this embodiment of the auxiliary supply device, a first embodiment of the coupling device has a switch, for example in the form of an electromechanical switch or a semiconductor switch or another coupling element, which is arranged on the intermediate circuit or in the intermediate circuit. In the case of an arrangement in the intermediate circuit, the switch of the coupling device may be electrically conductively connected to one terminal of the high-frequency switch and / or to one terminal of the control module and / or to one terminal of the signal feedback and / or to one terminal of the optocoupler of the signal feedback. According to this embodiment of the auxiliary supply device, a second embodiment of the coupling device to a voltage generation, which is formed for example by an output of a photovoltaic coupler. In this case, this voltage generation is electrically connected to the supply terminals of the control module of the intermediate circuit. In a particularly advantageous manner, activation or switching on of the auxiliary supply device by the coupling device is thus possible.

In addition, the auxiliary supply device can also supply consumers such as switches / radio and infrared receivers and status displays with energy, this being possible in the further state ready for operation of the mains isolation device, without the power supply device is switched on with higher power consumption.

In a particularly advantageous embodiment, at least the auxiliary power storage also consumers such as switches / radio and infrared receiver, Verstellwe- supply power to the detection systems, microprocessors and status displays, regardless of the operating states of the power supply device and / or the power supply device and / or the auxiliary supply device. The coupling device has a galvanic isolation. This is possible, for example, by means of an optocoupler.

In a further embodiment, a bridging device is provided parallel to the coupling device which bridges the coupling device during a first mains connection and connects the auxiliary supply device to the network for a predetermined time for charging the auxiliary power memory. This makes it possible to obtain a significantly shorter waiting time for commissioning than in the prior art. The auxiliary supply device can be connected by means of a charging switch regularly o / / and in dependence on a state of charge of the auxiliary power storage with the network. This is a constant operational readiness of the electromotive furniture drive achieved with the lowest power consumption. In one embodiment, the auxiliary supply device is designed as a miniature switching power supply. As a result, space and weight is saved, especially since the miniature switched-mode power supply can be designed as a wide-range miniature switched-mode power supply, so that all types of internationally known mains voltages and mains frequencies can be operated on it.

In a further embodiment, the auxiliary supply device is provided with a switchable and / or variable initial load, which is designed and temporarily connectable to a power cable, that a clear detection of the switched auxiliary supply device by a parent Netzfreischal- device is possible. In this way, a function of the electromotive furniture drive with higher-level power switches is possible.

In another embodiment, the auxiliary power storage is arranged in the power cut-off device and / or the motor control. Thus, depending on the structure of the electromotive furniture drive wiring and lines can be saved by the auxiliary power memory, for example, is arranged on the board on which the associated wiring to the control lines are provided. The motor control and / or the manual control can be provided with an auxiliary power source, which can be eg a battery, an accumulator or / and a capacitor. This also makes an emergency lowering function possible.

The electromotive furniture drive can also meet the demand for low power consumption of devices in stand-by mode.

Other characteristics and features will be apparent from the following description of a preferred embodiment and are the subject of further subclaims.

Reference to the accompanying drawings, the invention will be explained in more detail. There are shown: an exemplary and schematic representation of a trained as a linear actuator furniture drive according to the invention; a schematic block diagram of an embodiment of the Mö belantriebs of Figure 1; and schematic circuit diagrams of bypass circuits of Figure 2.

1 shows an electromotive furniture drive 1 with a power supply device 5 and a mains isolation device 9. The electromotive furniture drive 1 in this embodiment is a so-called linear drive 2, and the power supply device 5 is e.g. formed with a isolation transformer, rectifier and filter circuit or as a switching power supply. The linear drive 2 has, depending on the direction of rotation of an electric motor, not shown, a retractable and extendable lifting tube 3, at its free end a connection part in the form of a clevis 4 is attached. Another connection part in the form of a further fork head 4 is fastened to the housing of the linear drive 2. The respective connection part is in a manner not shown in each case with a furniture component in connection, so that move the connected to the linear drive 2 furniture components relative to each other during operation of the electric motor.

The mains isolation device 9 is connected according to the illustration of Figure 1 via a power cord 10 with a power plug 8, wherein in another and not shown embodiment of the power plug 8 at the power cut-off device 9 may be arranged. In another embodiment, the Netzfreischaltungseinnchtung 9 may be integrated in the power supply device 5. It should be noted that then the power supply device 5 is provided according to the illustration of Figure 1 with an enclosing housing, so that the power plug 8 can be attached to the housing or formed.

The Netzfreischaltungseinnchtung 9 is electrically connected to the power supply device 5 via a power line 1 1. An output of the power supply device 5 is connected via a supply line 12 to a motor controller 6, to which the linear drive 2 (also representative of more than one linear drive 2) with a motor line 13 is connected.

Furthermore, the Netzfreischaltungseinnchtung 9 via the power supply device 5 with the motor controller 6 is additionally connected by control lines 15 and 16 and a charging line 17. The functions of these lines 15, 16 and 17 will be explained in more detail below.

On the motor control 6, a manual control 7 is connected in a wired form with a control line 14, wherein according to the illustration of Figure 1, the manual control 7 has two push buttons. According to another embodiment not shown in detail, the handset 7 is coupled to the motor controller 6 via a wireless link and transmits radio waves or infrared light waves to control the at least one electric motor, i. Linear drive 2 to the motor controller 6. As shown in Figure 1 is in a first embodiment, the manual control 7 with the motor control 6 in conjunction, the motor controller 6 is designed as a relay control with relay switches and / or as a semiconductor circuit with semiconductor switches. The manually operable push-button switch of the manual control 7 switch the control current of the relay switch or the semiconductor switch, wherein the circuit breaker of the relay switch or the semiconductor switch switch the high motor current of the linear actuator 2.

According to the representation of FIG. 1, in a second embodiment, the manual control 7 is connected to the motor control 6, which connects the supply line 12 of the energy supply device 5 and a motor line 13 of the electric motor of the linear drive 2 and the electrical lines of the manually operated push button switch of the hand control 7 connects with each other. According to this embodiment, the contacts of the manually operable push-buttons of the hand-operated tion 7 designed as a circuit breaker and switch at keystroke the high motor current of the electric motor of the linear actuator. 2

In a further, but not shown embodiment, the power supply device 5 is inserted into the housing of the linear drive 2 or attached thereto, wherein the linear drive 2 can be constructed in a manner not shown in the manner of a double drive, which at least one motor, but preferably two Engines motors in a common housing.

The power plug 8 passes via the power cord 10, the input-side network voltage first to the Netzfreischaltungseinnchtung 9, which will be described in more detail below. The Netzfreischaltungseinnchtung 9 has three states. In a first state, the Netzfreischaltungseinnchtung 9 is off, in a second state, it is ready for operation and in a third state, the Netzfreischaltungseinnchtung 9 is turned on.

If the Netzfreischaltungseinrichtchtung 9 is turned on, e.g. activated by an actuated manual operation, it connects the power cable 10 via the power line 1 1 to the power supply device 5, which outputs a secondary voltage in the form of a DC voltage as the operating voltage on the secondary side and forwards them to the motor controller 6. The operating voltage is e.g. in the amount of about 29 V and is used in an operating state of the power supply device 5 for operating the motor controller 6 and the linear drive. 2

FIG. 2 shows a schematic block diagram of an exemplary embodiment of the furniture drive according to FIG. 1.

Power lines or paths are indicated by thick lines and control lines or - paths are indicated by thin lines. The Netzfreischaltungseinnchtung 9 includes a power disconnect switch 20 with a control switch 20a; an auxiliary supply device 21 (also referred to as an auxiliary voltage source); and a coupling device 24. In this embodiment, the Netzfreischaltungseinnchtung 9 also has a charging circuit 26 in addition. The power disconnect switch 20 is executed here two-pole with closing contacts. It is in this case a two-pole network relay, which is controlled by the control switch 20a. That is, in the first and second states (off and on) of the power-off device 9 is the power-off switch 20 open, in the third state (turned on) the Netzfreischaltungseinnchtung 9, the power disconnect switch 20 is closed.

The auxiliary supply device 21 is here equipped with a transformer 22 and a rectifier 23 and provides an auxiliary supply power at its output A for the one to supply the mains disconnector 20 and the other to supply the charging circuit 26 is available.

The auxiliary supply device 21 is formed in one embodiment as a small switching power supply to the transmitter 22. The transformer 22 is a high-frequency transformer. The auxiliary supply device 21 is connected directly to an input E with a line of the power cable 10, wherein the other line of the power cable 10 via the coupling device 24 to the input E of the auxiliary supply device 21 is connectable. In the first state of (off) the Netzfreischaltungseinnchtung 9, the auxiliary supply device 21 is turned off. In the second and third states (operational and on) of the power enable device 9, the auxiliary power supply 21 is turned on, i. connected to the power cord 10 and thus to the mains voltage of a connected electrical supply network. In another embodiment, the auxiliary supply device 21 is formed with a El-core transformer or toroidal transformer as a transformer 22.

In both embodiments of the auxiliary supply device 21, the output A and its provided auxiliary supply voltage are galvanically isolated from the electrical supply network due to the transformer 22.

By means of the coupling device 24, the auxiliary supply device 21 is switched on and off. The coupling device 24 has a control element 24a and an interacting with this of the control element 24a electrically isolated Kopel pelelement 24b. In this embodiment, the coupling device 24 is an optocoupler, wherein the control element 24a is a lighting means, e.g. an LED is, and the coupling element 24b is designed as a photosensitive switching transistor with a corresponding dielectric strength with respect to the mains voltage.

In another embodiment, not shown, the coupling element 24b is arranged on or in an intermediate circuit of the auxiliary supply device 21 described above, if this is designed as a switching power supply. The charging circuit 26 serves to provide a charging voltage for an auxiliary power storage 27, which is formed in this embodiment as a high-capacitance capacitor, for example, a so-called gold-cap capacitor. Its function will be explained in more detail below. The auxiliary power storage device 27 is charged by the auxiliary supply device 21 via the charging circuit 26 in the second and third states (ready and switched on) of the power cut-off device 9.

In this embodiment, the auxiliary power storage 27 is disposed in the engine controller 6. The motor control 6 comprises a control unit 6a, to which the linear drive 2 and the manual control 7 are connected, as well as a control signal distributor 28 and a charging switch 29.

The auxiliary power storage 27 is connected to an output A with an auxiliary supply line 18 and a common line 19, e.g. a ground or negative lead, connected to the control signal distributor 28. The common line 19 is also connected to the control unit 6a and via the control signal distributor 28 to the control switch 20a and the coupling device 24. The manual control 7 is connected via a manual control line 14a to the control line 14 to the control unit 6a and also connected via a trigger line 14c with the control signal distributor 28. In parallel with or in place of the manual control 7, a remote control receiver 30, e.g. for radio / infrared control, be coupled via a remote control line 14b to the control line 14.

The control signal distributor 28 is connected to the control switch 20a of the mains disconnecting switch 20 of the mains disconnecting device 9 via a control line, the control switching line 15 (see also FIG. 1) and via a further control line, the coupler line 16 to the control element 24a of the coupling device 24. In addition, the charging switch 29 is connected to the signal distributor 28 in this embodiment. The charging switch 29 is further connected to a measuring terminal MA of the auxiliary power storage 27.

The control signal distributor 28 serves to separate the different control lines 14, 15, 16 so that no repercussions can occur on other units connected thereto. This can e.g. be effected by means of diode gate. Other versions are of course possible.

In the following, the operation of the operation of the electromotive furniture drive will be explained. Starting from the first state (switched off) of the Netzfreischaltungseinrich- device 9, an operating button of the manual control 7 is actuated. Since the power disconnect switch 20 is opened, the power supply device 5 and the motor controller 6 are de-energized. In this first state, the auxiliary power storage 27 via the auxiliary supply line 18 and the signal distributor 28, a low electrical see power available, by means of which by the operated hand control 7 and the signal distributor 28, first, the control 24a of the coupling device 24 is sufficiently activated to the coupling element Turn on 24b. As a result, the auxiliary supply device 21 is switched on and thus the mains isolation device 9 changes from the first state to the second state ready for operation.

In other words, the mains isolation device 9 is switched off from the first state switched off in the second state ready for operation by the stored in the auxiliary power storage 27 electrical energy. The low power of the auxiliary power storage 27 is sufficient, so that the auxiliary power storage 27 may be formed correspondingly small.

After taking the second state ready for operation of the power-off device 9 and also operated manual control 7 is also a control signal from the manual control 7 via the control signal distributor 28 to the control switch 20a. Since now ready in the second state, the auxiliary supply device 21, the auxiliary supply voltage at its output and this is sufficient to actuate the power disconnect switch 20, the power disconnect switch 20 is turned on by the voltage applied to the control switch 20a control signal of the manual control 7. The mains isolation device 9 thus changes to the third state turned on. Now, the power supply device 5 and the motor controller 6 is connected to the network and the linear drive 2 moves in the desired direction of travel. When the handset 7 is released, control signals are applied neither to the control switch 20a nor to the coupling device 24. This opens the power disconnect switch 20 and the coupling element 24b. The mains isolation device 9 switches back to the first state switched off. This downshift may be delayed by means of a time delay in an embodiment not shown.

Of course, instead of the manual control 7, the remote control receiver 30 may also trigger the above-described operations. For this purpose, the remote control receiver at its output switches, for example in the form of transistor Switch, which are arranged equivalent to the triggering by pressing a button of the manual control 7.

The charging switch 29 serves to cause an automatic charging of the auxiliary power storage 27. In a first embodiment, the charging switch 29 may have a timing circuit which causes a regular charging. In a second embodiment, the charging switch 27 is caused to cause charging of the auxiliary power storage 27 by a voltage request of the auxiliary power storage 27. In this case, the voltage of the auxiliary power storage 27 at the measuring tap MA is compared with a value. As soon as this value is reached, the auxiliary power storage 27 is charged.

Such charging, which is initiated regularly or when a voltage limit value is reached, occurs in that the charging switch 29 has a switching output, for example in the form of a transistor switch, and a control voltage via the control signal distributor 28 selectively outputs a control signal to the coupling device 24 via the coupler line 16. This causes the auxiliary supply device 21 to be turned on. That is, the mains isolation device 9 switches from the first state turned off in the second state ready, and ready for operation only in this second state. The third state is turned on is not taken, since this is not necessary to load the auxiliary power memory 27, because the auxiliary power memory 27 is charged via the switched by means of the coupling device 24 auxiliary supply device 21.

This charging process takes only a short period of time, since the auxiliary power memory 27 only requires such a charge, which is necessary for the activation of the coupling device 24. The charging process can be time-controlled or voltage-controlled via the measuring tap MA. If the auxiliary power memory 27 is recharged, the mains disconnecting device 9 changes from the second state ready for operation back to the first state turned off.

Is in a house installation, a so-called higher-level power cut-off installed, which is not activated by turning on the coupling element 24b and the auxiliary supply device 21 due to their low power consumption, the input E of the auxiliary supply device 21 may be provided with a switchable and / or variable initial load, which trained so and is temporarily connectable to the terminals of the power cord 10 that a clear detection of the switched-auxiliary device 21 through the parent mains isolation is possible, which is not shown here. There- However, it is conceivable that the temporarily switchable initial load can be switched by, for example, a transistor switch or by the coupling device 24 or by a further coupling device, not shown. In a preferred and particularly advantageous embodiment, the primary coil of the transformer 22 is designed as an initial load, because in one embodiment it has a relatively low internal resistance. For this purpose, the transformer 22 may be formed as El-core transformer. In another embodiment, also not shown, an electrical resistance is connected in parallel to the primary coil of the transformer 2 or the transformer, not shown, of the auxiliary supply device 21.

The coupling element 24b of the coupling device 24 is connected in parallel in the embodiment shown in Figure 2 with a bridging circuit 25.

The bypass circuit 25 is used in an embodiment as an automatic switch at a first connection of the electromotive furniture drive 1 to the electrical supply network for immediate and automatic charging of the auxiliary power storage 27 by the mains isolation device 9 as described above by connecting the auxiliary supply device 21 with the power cord 10 from the first State is switched off in the second state ready, wherein the auxiliary power storage 27 is charged. This charging process takes place as already explained above in a very short time, so that the electromotive furniture drive 1 can be used within a few seconds, for example within 2 or 3 seconds. According to FIG. 3, the bridging circuit 25 may be formed with a bridge rectifier 25a and a timing element 25b, here an RC element. In this case, when the mains voltage is applied, current flows to the auxiliary supply device 21 for a short time. The coupling element 24b of the coupling device 24 is thus bridged for a certain time, the duration of the time depends on the structural design of the RC element and fractions of a second to a few seconds, for example, up to 10 seconds. Furthermore, the resistance of the RC element is designed as a high-resistance resistor, such that the current flow through the resistor after application of the mains voltage is very small, thus considered negligible, and thereby practically only for a short time current flows to the auxiliary supply device 21, when mains voltage is applied. According to FIG. 4, a PTC element can also be provided, which first of all transmits current parallel to the coupling element 24b due to a low resistance, but then assumes a high resistance due to the current and practically the same Power interrupts. Depending on the structural design of the PTC element, the PTC element can persist in this state after the transition to the state of high internal resistance and only falls back to the original state when the mains voltage is removed. Other configurations of a PTC element have an alternating character, with the internal resistance initially increasing after a certain period of time after the mains voltage is applied, and later the internal resistance alternating between a maximum value and a smaller value. The bypass circuit 25 may also include a wiper circuit and / or a timer. A manually operated button can also be provided in order to be able to charge manually.

A further embodiment of the electromotive furniture drive 1 includes in accordance with the invention a bridging circuit 25 or another bridging circuit 25 according to the manner described above and is provided according to Figures 3 and 4 with the terminals a and b, wherein the terminals a and b with the terminals 31st and 32 are connected as shown in FIG. According to the representation of FIG. 2, the connection 31 is arranged in a line between the coupling element 24b and the auxiliary supply device 21. At the connection 31, during operation of the electromotive furniture drive 1 or at the moment of initial startup, the first mains potential, for example the mains potential of the phase, is present. The terminal 32 is directly connected to another line of the network, wherein at the terminal 32 during operation of the electromotive furniture drive 1, the second power potential, for example, the potential of the neutral conductor or the center conductor, is applied. A further embodiment of the electromotive furniture drive 1 has a bridging circuit 25 or a further bridging circuit 25, which is connected to the terminals 32 and 33 as shown in FIG. At the terminal 33 is the operation of the electromotive furniture drive 1, the first power potential, for example, the grid potential of the phase to.

The function of the bypass circuit 25, which is connected with its terminals a and b at the terminals 31 and 32 and / or at the terminals 32 and 33, is as follows: Starting from the de-energized state of the system, the bypass circuit 25 at the moment of applying a Mains voltage electrically continuous and conductive and acts at the moment of initial commissioning as a consumer. In this case, the RC element or the PTC element is designed such that the test voltage of a higher-level mains isolation, which can also be described as a so-called home mains isolation, at the terminals 31, 32nd and / or 32, 33 connected bridging circuit 25 as a consumer detected and then turns on. This can be ensured in accordance with the invention that the electromotive furniture drive 1 described above can be operated smoothly with any design of a parent power cut.

The embodiments described above do not limit the invention. It is modifiable within the scope of the appended claims.

Thus, it may be conceivable that the engine control 6 or / and the manual control 7 is / are provided with an additional auxiliary power source. This auxiliary power source may e.g. a battery / rechargeable battery / a capacitor and also serve for emergency lowering.

The coupling device 24 may e.g. also be a photovoltaic optocoupler. Further embodiments are conceivable, such as relay, coil / Hall sensor, Lampe-LDR, coil with primary and secondary resonant circuit, miniature transformer with upstream sine wave generator, etc. In a preferred embodiment of the coupling device 24, this has a control element 24a and a coupling element 24b , which are galvanically separated from each other. In a simplified embodiment of the coupling device 24, this is formed for example by a semiconductor switch, wherein the control element 24a and the coupling element 24b have a common terminal.

If the auxiliary supply device 21 is designed as a switched-mode power supply, its control circuit can also be connectable to the network by means of a coupling device via a suitable voltage regulator circuit.

The power disconnect switch 20 may also include semiconductor switches, eg triac, MOSFET. A charging of the auxiliary power storage 27 can also be done for example via active optocouplers, wherein the auxiliary supply means 21 feeds the optocoupler and its photovoltaic element, the charging power to the auxiliary power storage 27 supplies. Other couplings are of course possible. LIST OF REFERENCE NUMBERS

1 Electromotive furniture drive

2 linear drive

3 lifting tube

4 clevis

5 power supply device

6 engine control

7 manual operation

8 power plug

9 mains isolation device

10 power cables

1 1 power line

12 supply line

13 motor cable

14 control line

14a manual control line

14b remote control line

14c trigger line

15 control circuit

16 coupler line

17 charging line

18 auxiliary supply line

19 Community leadership

20 mains disconnect switch

20a control switch

21 auxiliary supply device

22 transformers

23 rectifier

24 coupling device

24a control

24b coupling element

25 bridging circuit

25a bridge rectifier

25b timer

25c PTC element

26 charging circuit

27 auxiliary power storage

28 control signal distributor Charging switch remote control receiver, 32,33 connections

Claims

claims

1 . Electromotive furniture drive (1) with a power supply device (5), a manual control (7) and with a mains isolation device (9), which can be switched from an off state to an on state and back, for adjusting movable furniture components relative to each other,

wherein the electromotive furniture drive (1) has at least one direction of rotation reversible electric motor, wherein each electric motor is followed by a Drehzahlreduziergetriebe and wherein each Drehzahlreduziergetriebe another gear is connected downstream,

and wherein the energy supply device (5) has a network connection, which is connectable to the network by the mains isolation device (9), wherein the energy supply device (5) transforms the network-side input voltage into at least one output-side low voltage, and an isolation transformer or a transmission unit for galvanic isolation between the network-connected input side and the low-voltage output side for operation of the electromotive furniture drive (1), wherein the mains isolation device (9) an auxiliary supply device (21), at least one power disconnect switch (20), which is opened in the off state and in the on state is closed, and has a chargeable auxiliary power storage (27), characterized

in that the auxiliary power store (27) is decoupled from the power supply device (5), connected to the auxiliary supply device (21) and can be charged by the auxiliary supply device (21).

2. Electromotive furniture drive (1) according to claim 1, characterized in that the mains isolation device (9) has a further state ready for operation, in which the auxiliary supply device (21) is connected to the network and the power disconnect switch (20) is opened.

3. Electromotive furniture drive (1) according to claim 2, characterized in that the auxiliary power memory (27) provides a stored auxiliary power, with which the mains isolation device (9) from the off state in the further state is operable switchable.

4. Electromotive furniture drive (1) according to claim 3, characterized in that the auxiliary power storage (27) with a coupling device (24) connectable is, wherein the coupling device (24) for connecting the auxiliary supply device (21) is provided with the network.

Electromotive furniture drive (1) according to claim 4, characterized in that the coupling device (24) has a galvanic isolation.

Electromotive furniture drive (1) according to claim 4 or 5, characterized in that parallel to the coupling device (24) a bridging device (25) is provided, which bridges the coupling device (24) at a first mains connection and the auxiliary supply device (21) the network for a predetermined time for charging the auxiliary power storage (27) connects.

Electromotive furniture drive (1) according to one of the preceding claims, characterized in that the auxiliary supply device (21) by means of a charging switch (29) regularly or / and in response to a state of charge of the auxiliary power storage (27) is connectable to the network.

Electromotive furniture drive (1) according to one of the preceding claims, characterized in that the auxiliary supply device (21) is designed as a miniature switching power supply.

Electromotive furniture drive (1) according to one or more of the preceding claims, characterized in that the auxiliary supply device (21) is provided with a switchable and / or variable initial load, which is designed and temporarily connectable to a power cable (10) that a unique Recognition of the switched auxiliary supply device (21) by a higher-level mains isolation is possible.

0. Electromotive furniture drive (1) according to one or more of the preceding claims, characterized in that the auxiliary power storage (27) in the mains isolation device (9) and / or the motor control (6) is arranged. 1 electromotive furniture drive (1) according to one or more of the preceding claims, characterized in that the motor control (6) and / or the manual control (7) is provided with an auxiliary power source / are.

12. Electromotive furniture drive (1) according to claim 1 1, characterized in that the auxiliary power source is a battery, an accumulator or / and a capacitor.