EP2454747A1

EP2454747A1 - First-fail-safe electromotive furniture drive

Info

Publication number: EP2454747A1
Application number: EP10734967A
Authority: EP
Inventors: Armin Hille
Original assignee: Dewert Antriebs und Systemtechnik GmbH and Co KG
Current assignee: Dewertokin GmbH
Priority date: 2009-07-14
Filing date: 2010-07-14
Publication date: 2012-05-23
Anticipated expiration: 2030-07-14
Also published as: JP2012533161A; US20120194106A1; JP2012533283A; DK2454747T3; WO2011006930A1; DK2454746T3; US9230764B2; EP2454746B1; AU2010272519A1; US20120206070A1; CN102498537A; DE202009005020U1; US8981679B2; CN102498537B; WO2011006931A1; JP5896899B2; CN102484017A; CN102484017B; AU2010272518A1; EP2454746A1

Abstract

A first-fail-safe electromotive furniture drive (1) is disclosed that comprises at least one drive unit (4) having at least one motor (4.1); at least one actuation device (2) having at least two actuation units (12, 13), each of which includes a motor contact element (12.1; 13.1) and a safety contact element (12.2; 13.2); at least one supply unit (3); and at least one safety device (9). The furniture drive (1) is equipped with an indication device (10) for displaying the functioning and a failure of the at least two actuation devices (12, 13) and the safety device (9).

Description

The invention relates to a first-fail-safe electromotive furniture drive according to the preamble of claim 1.

Such electromotive furniture drives are known in different versions for Versteilung of various furniture. Among other things, these furniture includes recliner and seating furniture, such as beds, slatted frames, TV armchairs. In particular, in the field of domestic and clinical care as well as in medicine electromotive furniture drives in associated furniture, for example in nursing beds and hospital beds used. In these areas of application, relevant regulations, standards and laws with regard to safety apply, whereby the so-called first fault safety is of great importance.

First-fault safety means that when a first fault, for example a component, occurs, there is no danger to the user and no unwanted and / or unintentional functions and / or unintentional movements of moving furniture elements are produced, which create dangers.

EP 1 341 201 A2 describes an electromotive adjusting arrangement for furniture with a release relay, via whose contacts a total motor current flows, which is then fed to a further Reiaisanordnung for acting on a drive motor for the action of an adjustment function. This release relay is assigned a function monitoring module, which controls the functionality of the release relay.

DE 103 41 705 A1 describes an arrangement for operating an electrically adjustable seat and / or reclining furniture with a device for supply current release circuit with a relay. The arrangement has a switching means for switching a motor and a further switching means for switching the relay for supply current release, wherein the switching means of independent switching contacts, which are simultaneously actuated. The object of the present invention is therefore to provide an improved first-fail-safe electromotive furniture drive.

The object is achieved by a furniture drive with the features of the characterizing part of claim 1.

Accordingly, a first-fail safe electromotive furniture drive is provided, comprising: at least one drive unit with at least one motor; at least one actuating device with at least two actuating units, which each have a motor contact element and a safety contact element; at least one supply unit; and at least one safety device. The furniture drive is formed with a message device for displaying the function and for displaying the error of the at least two actuator units and the safety device. Further advantageous embodiments are the subject of dependent claims and will become apparent from the following description.

Thus, a first-fail-safe electromotive furniture drive, for example, for use in the medical and / or care sector with requirements for Erstfehiersicher- is provided. The message device not only avoids correct functions of functional units, but also an occurrence of errors in these. In this case, not only a functional and error display of safety devices but also of actuators in an advantageously simple manner created. A further advantage is that also furniture drives with so-called direct cutting are included in the field of application of the invention. Direct switching means that the motor current of the drive motor flows directly through the actuator, with their switching contacts for a high motor current (for example in the range 1 to 10 A) as opposed to a low control current (for example in the range of a few mA to 0.5 A) ) are designed for a relay circuit. Such drives with Direktschaitung are located, for example, in the low price sector, the invention in a simple structure and thus also cost effective for this purpose is used. Of course, it may also be possible for the field of application of the invention to include controls which include amplifier amplifiers, such as relays, semiconductor switches, and the like, which are driven by a low control current and switch high motor current. It flows only the low control current through the actuator. Combinations are possible, of course.

It is envisaged that each of a motor contact element and a safety contact element are mechanically coupled together. In this case, this coupling can be designed such that one of the contact elements can be actuated in advance. A simultaneous operation is of course also possible.

The safety contact elements of the actuating units switch in coupling with the at least one safety device whose safety switching element. They can therefore be designed for a low control current.

In a further embodiment, the safety device is arranged in the actuating device. In this case, the burglary switching element of the safety device can be a relay and / or a semiconductor switch. The safety device can also be arranged in the supply unit, the voltage source and / or combined in these. In this case, the combined arrangement means that components of the safety device are placed at different locations, for example in the supply unit and in the voltage source.

An alternative embodiment provides that the safety contact elements of the at least two actuating units form the at least one safety device. The safety contact elements are designed for the high motor current and connected in series with the associated motor contact elements. In this case, there is the advantage that a safety switching element in the form of an additional relay or semiconductor switch can be dispensed with. In addition, a housing of the supply unit can be smaller. Of course, the safety contact elements can also be designed as a semiconductor switch with control contact elements. The signaling device may have optical and / or acoustic signaling elements. It is also possible to use haptic detectors. It is also conceivable that a device for forwarding messages to external display or monitoring devices is provided. In this case, the forwarding can take place, for example, by means of a wired connection, for example via the telephone network, electricity network or Internet. It is also possible, of course, to forward messages wirelessly, for example via WLAN or radio networks. The signaling device may preferably comprise light-emitting diodes as optical signaling elements. In this case, at least one diode unit can also be used in order to save on components or to design logic operations in a simple manner. Of course, it is also possible that logical connections of certain states to power lines by an evaluation unit, such as diode gate, diode logic, logic gates, controller or dgi., Are evaluated, the results are then passed to the output by the reporting elements to this.

In a further embodiment, the signaling device has at least one light-emitting diode with a high-impedance resistor. This makes it possible in a simple manner that a current flowing through the internal resistance of the motor low current to detect a first error can be scanned by the reporting device.

In another embodiment, the safety device is part of a mains switching unit with auxiliary voltage source. This auxiliary voltage source can be a battery or accumulator, e.g. also with appropriate charging circuit, or even a mains-connected Hüfsspannungstransformator. An auxiliary voltage transformer eliminates the need for battery replacement. The invention will now be explained in more detail by means of exemplary embodiments with reference to the accompanying drawings. Hereby show:

Fig. 1 is a schematic block diagram of a first embodiment of a furniture drive according to the invention;

Fig. 2 is a circuit diagram of the first embodiment of Fig. 1;

3 is a circuit diagram of a second embodiment of the Möbeiantriebs invention;

Fig. 4 is a circuit diagram of a third embodiment of the invention

Möbeiantriebs; and

Fig. 5 is a circuit diagram of a fourth embodiment of the invention

Möbeiantriebs. - -

Components and functional elements or groups which have the same or similar functions are provided with the same reference numerals in the figures.

1 shows a schematic block diagram of a first exemplary embodiment of an electromotive furniture drive 1 according to the invention.

The electromotive furniture drive 1 comprises in this example an actuating device 2, a supply unit 3 and a drive unit 4 for adjusting an adjustable part or more of a piece of furniture, not shown.

The supply unit 3 here has a voltage source 8, which is for example a transformer and / or an accumulator. The voltage source 8 can be connected to a mains connection 5 to an electrical supply network. Furthermore, the supply unit 3 is here equipped with a safety device 9 for the first fault safety of the electromotive furniture drive 1, which will be explained in more detail below. The power connector 5 can also be used as a

molded, attached and / or plug-in connector portion may be attached to the housing of the supply unit 3 (for example, as a plug-in power supply). The Betätigungseinrachtung 2 is connected via a Verbändungsleitung 6 with the supply unit 3 via a distributor 18, for example a T-distributor. At this distributor 18 and the drive unit 4 is connected via a motor line 7, wherein this is continued here in the actuator 2. It is also possible in other embodiments that the distributor 18 is located on or in the supply unit 3. In such a case, the connecting line 6 also includes the motor line 7. The distributor 18 may, for example, also be connected to or inserted in the drive unit.

The actuating device 2 here has two first actuating units 12 and two second actuating units 13 for actuating in each case a drive unit 4. In this example, only one group 12, 13 is used, since only one drive unit 4 is present. Of course, more than two drive units 4 can be used, in which case a correspondingly adapted actuator 2 is used and further actuation units 12, 13 has.

The furniture drive 1 is designed such that the motor current flowing through the motor line 7 of the drive unit 4 is supplied from the supply unit 3 to the actuating unit 3. direction 2 is passed, where it can be fed by the actuatable actuators 12, 13 in a corresponding polarity to supply the drive unit 8 in the motor line 7. This is a so-called direct drive furniture drive. 1

In addition, the actuating device 2 is provided with a signaling device 10, which serves both to display the function and to display a first error and thus Erstfehiersicherheit. The reporting device 10 may be executed optically and / or acoustically. Here it has three optical message elements 11, which will be described in more detail below.

A circuit diagram of this first embodiment of FIG. 1 is shown in Fig. 2. For simplicity, the manifold 18 is not shown, but is easy to imagine. The supply unit 3 here has a transformer 8.1 as Spannungsqueile 8, wherein a primary winding of the transformer 8 via a primary fuse 22, for example, a thermal fuse in the primary winding, is connected to the mains connection 5, and wherein a secondary winding of the transformer 8 via a rückstelibares securing element 21 is connected to a rectifier bridge 19 for the provision of DC voltage. The primary fuse 22 and / or the fuse element 21 can also be assigned in each case additionally a fuse. Primary fuse 22 and / or fuse element 21 can also be only fuses themselves. The rectifier bridge 19 is a Giättungskondensa- tor 20 downstream. The negative pole of this DC voltage is connected to a main minus line 6.1 of the connecting line 6. To the positive pole of

Rectifier bridge 19 is a main positive line 6.2 of the connecting line 6 connected. Furthermore, the positive pole is connected to a first safety switching contact 15.1 of a safety switching element 15, for example a relay. This first safety switching contact 15.1 is open when the safety switching element 15 is not energized. A closing contact connection of the first safety switching contact 15.1 leads to a motor plus 6.3, and a control input of the safety switching element 15, here the winding of the relay is connected to a control line 6.4 of Verbindungsieitung 6. Furthermore, the safety switching element 15 is connected to the negative pole (main minus lead 6.1) of the secondary DC voltage. The safety switching element 15 forms here the safety device 9. These lines 6.1 to 6.4 lead as Verbindungsieitung 6 to the actuator 2, with the actuator units 12, 13, they are connected, as will be explained below. The actuating device 2 - also referred to as a so-called manual switch - comprises here the first actuating unit 12 and the second actuating unit 13. In this example, the actuating unit 12 is a button with an actuating button which acts on two contact elements, namely a first motor contact element 12.1 and a first safety contact element 12.2. The first motor contact element 12.1 is a changeover contact and the first safety contact element 12.2 is designed as a make contact. In the same way, the second actuating unit 13 is constructed with a second motor contact element 13.1 (changeover contact) and a second safety contact element 13.2 (normally open contact). By a respective actuating button (not shown), the motor contact elements 12.1 and 13.1 and the safety contact elements 12.2 and 13.2 are actuated together. These

Betätigungsbarkeϊt may be formed such that either both Kontaktiemente 12.1 / 12.2 and 13.1 / 13.2 simultaneously or in chronological succession operable. In the latter case, first the safety contact element 12.2 / 13.2 is actuated ("leading contact element") and then the motor contact element 12.1 / 13.1 is reversed when it is released, both contact elements 12.1 / 12.2 and 13.1 / 13.2 can each have, for example, a common actuating element, However, they can also be actuated simultaneously or one after the other by a type of rocker, whereby only one press of a button is required. to effect a movement of the drive unit 4.

The contact elements 12.2., 13.2 can also be designed so that they have a switching output, which consists for example of a semiconductor switch or relay switching contact, which is controlled by a certain size, such as a touch switch, proximity switch, touch screen u. dgi.

The respective changeover contact of the motor contact elements 12.1 / 13.1 is connected in each case with its Anschiuss a via the motor line 7 with a motor 4.1 of the drive unit 4. In the idle state, each change in contact connects the connection a to an opener connection b. When actuated, each changeover contact connects the connection a to a normally open connection c. The Öffneranschlüsse b are each with connected to the main minus lead 6.1 and the normally open terminals c are each connected to the Motorpiusleitung 6.3. The safety contact elements 12.2 and 13.2 are each connected to the control line 6.4 with a connection d and are each connected to a connection e at the main extension 6.2.

In addition, the actuating device 2 is equipped with the signaling device 10, which here three indicator lights 11.1, 11.2 and 11.3 in the form of light emitting diodes (LED) with respective series resistors RI ₁ R2 and R3 comprises The first indicator light 11.1 is here via series resistor R1 to the control line 6.4 and connected to the main minus line 6.1, the cathode of the LED is on the main minus 6.1. The second indicator light 11.2 is connected to the cathode via the series resistor R2 to the main minus lead 6.1 and with its anode to the motor lead 6.3. The third indicator light 11.3 is connected with its anode via the series resistor R3 to the main positive line 6.2 and with its cathode to the motor plus line 6.3.

If this first or the second actuating unit 12, 13 is actuated in order to switch the motor 4.1 in a corresponding direction of movement, then the respective safety contact element 12.2, 13.2 switches on the safety switching element 15 whose safety switching contact 15.1 connects the main positive line 6.2 to the motorpius line 6.3. Thus, the normally open terminals b of the motor contact elements 12.1, 13.1 are at the potential of the main positive line 6.2, the motor 4.1 is switched on accordingly and the first indicator light 11.1 lights up as long as the respective safety contact element 12.2, 13.2 is actuated. It signals its function. When you release the depressed actuator unit 12, 13, the first indicator light must go out 11.1. If this is not the case, it signals a first error, namely that the actuated safety contact element 12.2, 13.2 has not switched off. If it does not shine at all, it signals that the actuated safety contact element 12.2, 13.2 has no function. Indicator light 11.1 thus serves to display the function and error display of the safety contact elements 12.2, 13.2 and thus contributes to the first error safety.

As soon as the motor positive line 6.3 is at the potential of the main positive line 6.2, the second indicator light 11.2 lights up. It thus serves to display the function of the safety switch element 15. If, in spite of the actuation of the safety contact element 12.2, 13.2 and its respective correct function display, it does not light up, The second indicator light 11.2 siert a first error of SicherheitsschalteSe- mentes 15 and also contributes to Erstfehlersicherheit.

The series resistor R3 of the third indicator light 11.3 is particularly high impedance. The third indicator light 11.3 signals when lighting a defective motor contact element 12.1, 13.1, for example for FaII ₁ that the closing contact a / c of a respective changer of a motor contact element 12.1, 13.1 is burned or welded and no longer opens. Then lies in the unactuated state of the actuator 2, the motor plus 6.3 via the so incorrectly closed motor contact element 12.1, 13.1, the thus connected via the motor line 7 motor 4.1 and the other motor contact element 12.1, 13.1 on the main minus 6.1 (via the internal resistance of the motor 4.1 ). In this way, then the third indicator light 11.3 is turned on and thus indicates this first error. The current flowing through the motor is so low that the motor does not start.

3 illustrates a circuit diagram of a second embodiment of the furniture drive 1 according to the invention, wherein in contrast to the first embodiment shown in FIG. 2, the safety switching element 15 is arranged in one of the voltage source 8 to the power supply 5 upstream power switching unit 16 and with a second safety switch contact 15.2, the voltage source 8 connects to the mains connection upon energization of the safety switching element 15. The safety switching contact 15.2 is designed here bipolar. The safety switching element 15 also creates the safety device 9 here. The network switching unit 16 is also referred to as mains isolation. Since there is no energy for energizing the safety switching element 15 when the mains connection 5 is disconnected from the voltage source 8, an auxiliary voltage source 17 is arranged with an auxiliary voltage transformer 17.1, which is permanently connected to the mains connection 5. The auxiliary voltage source 17 may also be a battery and / or an accumulator. The auxiliary voltage source 17 supplies a DC voltage (here by bridge rectifier and Giättungskondensator) whose negative PoS to the safety switching element 15, the cathode of the LED of the second indicator light 11.2, which is here in the network switching unit 16 is arranged (but also in the actuator 2 can), and a Hilfsminusieitung 6.5 of the connecting line 6 is connected The positive pole of the auxiliary voltage source 17 is connected via an auxiliary positive line 6.6 to the Hauptplusieitung 6.2 of the connecting line 6. Thus, the main positive line 6.2 always carries the potential of the auxiliary positive line 6.6. The safety switching element 15 is connected to a field connection or control end connected to the control line 6.4. A Motorpiusleitung 6.3 is not present, since the Hauptpiusleitung 6.2 and the main minus 6.1 are schaitbar by the safety switching element 15. The actuating units 12, 13 of the actuator 2 are constructed as in the first Ausführungsbeispiei. Their connections to the connection cable 6 are as follows. The terminals a of the motor contact elements 12.1, 13.1 are connected to the motor line 7 (as in FIG. 2). The terminals b are also located on the main minus lead 6.1 as in the first embodiment. But the connections c are connected to the main positive line 6.2. The connections d of the safety contact elements 12.2, 13.2 lie together on the control line 6.4, and the connections e are connected to the main positive line 6.2 and to the auxiliary positive line 6.6.

Upon actuation of an actuating unit 12, 13, a respective safety contact element 12.2, 13.2 switches on the safety switching element 15, which connects the voltage source 8 to the mains connection 5, by means of the potential of the auxiliary positive lead 6.6 on the main positive lead 6.2. Then, the main positive line 6.2 leads the potential of the voltage source 8, which is switched by the respective actuated motor contact element 12.1, 12.2 to the motor 4.1 for its movement.

The first indicator light 11.1 (indicator light designed as an LED) is connected in this second embodiment with the cathode to the mainminiature line 6.1 and to the anode via the series resistor R1 to the main positive line 6.2. It lights up when the safety switch element 15 is turned on when actuated. If it does not light when actuated, this is a signaling of a first fault of the safety switching element 15.

The second indicator light 11.2 also lights up when actuated and indicates a defective safety contact element 12.2, 13.2 when actuated by non-lighting.

The third indicator light 11.3 is connected via a diode unit 14, which is connected between the motor lines 7, to the anode via a series resistor R4, its cathode being connected to the HiSfsminus line 6.5. The

Diode unit 14 has a first diode 14.1 and a second diode 14.2, whose cathodes are connected together, and whose anodes are each connected to a motor line 7. The cathodes are connected to the third indicator light 11.3. When the engine is switched on 4.1, that is, when pressed, the third indicator light 11.3. If it does not light despite being actuated, it signals a first fault of a motor contact element. If it lights up after releasing an actuating unit 12, 13, it signals, for example, a bonded closing contact a / c of a previously actuated motor contact element 12.1, 13.1.

Fig. 4 shows a third embodiment of the furniture drive 1 according to the invention, wherein an advantageous simple construction of a first-fail-safe furniture drive 1 is provided with direct circuit. In contrast to the first and second exemplary embodiments, the connecting line 6 has only the main minus line 6.1 and the main positive line 6.2, which are supplied by the voltage source 8 (described in FIG. 2).

Another difference to the first and second embodiments is that the safety device 9 is formed in each case by a safety contact element 12.2, 13.2 of the actuating units 12, 13.

While in the first and second embodiments, the motor current of the motor 4.1 flows through the motor contact elements 12.1, 13.1 and the safety contact elements 12.2, 13.2 are acted upon only with a control current for the safety switching element 15, in the third Ausführungsbeäspiel the safety contact elements 12.2, 13.2 acted upon by the motor current, since they are connected in series with the closing contact a / c of the respectively associated motor contact element 12.1, 13.1. Here, the terminals a as in the first and second Ausführungsbeispiei with the motor line 7 and the Öffneranschlüsse b connected to the main minus line 6.1. The normally open terminals c of the motor contact elements 12.1, 13.1 are respectively connected to the terminals d of the associated safety contact elements 12.2, 13.2 whose Schiießeranschlüsse e are in turn connected to the main positive line 6.2.

The first indicator light 11.1 (LED) lies with its cathode at the anode of a series-connected third diode 14.3 of a diode unit 14, whose cathode is connected both to the terminal d of the first safety contact element 12.2 and to the terminal d of the second safety contact element 13.2 , The anode of the first indicator light 11.1 is located at half the supply voltage via a high-impedance voltage divider (R5, R6), which is connected between the main minus line 6.1 and the main positive line 6.2 - -

The second indicator light 11.2 (LED) lies with its anode at the cathode of a series-connected fourth diode 14.3 of the diode unit 14, whose anode so- wohi at the terminal d of the first safety contact element 12.2 and at the terminal d of the second Sicherheitsungskontakteiementes 13.2 connected. The cathode of the first indicator light 11.1 is also at half supply voltage to the high-impedance voltage divider (R5, R6).

Upon actuation of an actuating unit 12, 13, the second indicator light 11.2 lights to check the function, as long as the actuation lasts, is a motor contact element 12.1, 13.1 defective (NO contact a / c glued, welded or the like), so after releasing the operation on the internal resistance of the motor 4.1 negative potential at the cathode of the third diode 14.3, whereby the first indicator light 11.1 in this way signals this first fault of a motor contact element 12.1, 13.1. If a safety contact element 12.2, 13.2 (closer d / e bonded, welded or the like), so after releasing the operation is positive potential of the main positive line 6.2 on the closed contact at the anode of the fourth diode 14.4. Then the second indicator light 11.2 lights and signals this first error of a safety contact element 12.2, 13.2 in this way. The current flowing through the motor in this case is so low that a breakaway torque for starting the engine is not generated, and the motor thus does not move.

A first error in the motor contact elements 12.1, 13.1, safety contact elements 12.2, 13.2, safety switching elements 15 and / or safety switch contacts 15.1 does not lead to any uncontrolled behavior of the furniture drive and is signaled immediately. This is a first-fail safe electric motor furniture drive 1 created in direct circuit. in Fig. 5 shows a circuit diagram of a fourth embodiment of the furniture drive 1 according to the invention.

In this example, the safety switching element 15 is similar to the second embodiment of FIG. 3 arranged in one of the voltage source 8 to the power supply 5 upstream power switching unit 16. In contrast to the second exemplary embodiment, here the auxiliary voltage source 17 is configured, for example, as a battery, rechargeable battery (accumulator) and / or capacitor with high capacity. bifdet. A positive pole of the auxiliary voltage source 17 is connected via a first protective diode 23 to the auxiliary positive line 6.6, the negative pole! is connected to the main minus 6.1. The protective diode 23 serves as a

Reverse polarity protection and on the other hand to protect against the voltage that leads the main positive line 6.2, which is generally higher than the auxiliary voltage. Because in a further difference from the second embodiment, a connection of the main positive line 6.2 via a second protective diode 24 is performed with the auxiliary positive line 6.6, wherein the second protective diode 24 is located with its anode to the main Plusieitung 6.2. Thus, the auxiliary positive line 6.6 always carries the potential of the auxiliary voltage. If the voltage source 8 is turned on, the Hilfsplusieitung 6.6 leads to the cathode of the first protective diode 23, the potential of the auxiliary voltage and behind the cathode, the potential of Hauptpiusleitung 6.2 reduced by the forward voltage of the second protective diode 24. Also in the fourth embodiment, the cathode of the LED is the second indicator light 11.2 arranged in the network switching unit 16 and connected to the Hilfsminusieä- device 6.5 and the main minus lead. The safety switching element 15 is connected to the control line 6.4 as in the second exemplary embodiment with the exciter connection or control connection. Again, a motor plus 6.3 is not present, since the main plus line 6.2 and the main minus 6.1 by the safety switching element 15 are switchable.

The actuators 12, 13 of the actuator 2 are constructed as in the second embodiment. Their connections to the connection cable 6 are as follows. The terminals a of the motor contact elements 12.1, 13.1 are connected to the motor line 7 (as shown in FIGS. 2 and 3). The terminals b are also on the main minus lead 6.1 as in the first and second embodiments and the leads c are connected to the main positive lead 6.2. The terminals d of the safety contact elements 12.2, 13.2 are together on the control line 6.4, wherein the terminals e, in contrast to the second embodiment, are connected to the auxiliary positive line 6.6.

Upon actuation of an actuation unit 12, 13, a respective safety contact element 12.2, 13.2 switches on the safety switching element 15 through the potential of the auxiliary positive lead 6.6, which connects the voltage source 8 to the mains connection 5. Then leads the Hauptplusieitung 6.2 the potential of the voltage source 8, soft by the respective actuated motor contact element 12.1, 13.1 on the motor 4.1 is switched for its movement. At the same time, the potential of the main positive line 6.2 is then applied via the second protective diode 24 to the auxiliary positive line 6.6 and conducted to the safety switching element 15 via the respective closed safety contact element 12.2, 13.2. This is advantageous if the Hiifs- voltage source 17 has only a small capacity, which is sufficient for switching but not to maintain a switched state of the safety switching element 15. Thus, auxiliary voltage sources 17 can be used with little space. The first indicator light 11.1 {indicator light designed as LED) is connected in this fourth Ausführungsbeispiei with the cathode to the main minus lead 6.1 and the anode via the series resistor R1 to the main positive line 6.2. It lights up when the safety switch element 15 is turned on when actuated. If it does not light when actuated, this is a signalization of a first fault of the safety-shunt element 15.

The second indicator light 11.2 also lights up when actuated and indicates a defective safety contact element 12.2, 13.2 when actuated by non-lighting. The invention is not limited to the embodiments described above. It is modifiable within the scope of the appended claims.

Thus, for example, a fourth indicator light can be arranged as a supply voltage indicator in the actuating device 2, which indicates a defective fuse element 21, 22 when connected to the mains by non-lighting.

The indicator lights 11.1 to 11, 3 of the signaling device 10 may also be configured as a multi-color LED. It is also possible, for example, to use LEDs with integrated flashing circuit, whereby the flashing function is used for fault display.

It is conceivable that the fuse switching element 15 of the first embodiment may be arranged in the actuating device 2, wherein the power supply is, for example, a plug-in power supply. Thus, it is possible to dispense with a separate housing of the supply unit 3. In the actuator 2 may also be arranged a so-called overcurrent shutdown for switching off an engine in case of overload. Of course, such an overcurrent shutdown can also be arranged, for example, in the supply unit 3 and / or at another suitable location in the course of the power lines, which lead the motor current during operation of the motor.

The Stheitheitskontaktelement 12.2, 13.2 may also be designed as a changer, whereby it is possible to lock individual drives 4 against each other, when their Versteilfunktionen with simultaneous operation to a danger.

It is also conceivable that the actuating device 2 is provided with lock screws or with suitable locking functions, whereby the power supply of the safety contact elements 12.2, 13.2 can be prevented. Of course, a lighting of the actuator 2, for example with LEDs, possible.

The safety switching element 15 may also be a semiconductor switch instead of a relay. Thus, it is conceivable that the safety contact element 12.2 / 13.2 as a safety device 9 in the third embodiment (see Fig. 4) may be a combination of a mechanical Schiießerkontakt for control and a power semiconductor switch for the motor current.

Of course, the actuator 2 may also be provided with a further Spannungsquel- Ie in the form of a battery or a rechargeable battery, whereby a so-called Notabsenkungsfunktion is given.

Other connections for additional lights, such as a bedside lighting, can be provided for example by means of X-connector in the connecting line 6.

A so-called care LED can also be installed in the supply unit 3, whereby a line to the actuator 2 can be saved. This Care LED indicates a fault, for example, when it lights up, does not light, when the actuator is pressed, flashes, changes color, and so on. like. It is also possible that the signaling elements 11 of the signaling device 10 are controlled by an evaluation unit. This evaluation unit can be used, for example, as a diode gate {see diode unit 14), logic gates, controllers and the like. Like. Be formed, which evaluates voltage and / or current states of the different lines (even with previously festleg ble Soliwerten, Sollkonsteriiationen etc.) compares and as a result, the signaling elements 11 accordingly on / off, blink and / or color can be changed.

In one embodiment of the safety contact elements 12.2, 13.2, these have a movable carbon contact, movable metal contact or a movable foil contact, which is mechanically coupled to an actuating unit and is designed to be manually operable. The respective movable contact is operatively connected to a fixed contact, which is inextricably or materially connected as a carbon contact or as a gold-plated contact of a fixed or flexible printed circuit board or film.

In general, the safety device 9 or the signaling device 10 described in the introduction is part of the furniture drive 1, wherein the safety device 9 and / or the signaling device 10 can be arranged in only one component or separately in different components of the furniture drive 1 in a preferred embodiment , Some arrangements are already described in more detail above, in summary, the safety device 9 and / or the signaling device 10 may be integrated in a component of the furniture drive 1, but at least electrically connected to at least one of the components, the components of the furniture drive 1 substantially from the supply unit 3, the distributor unit 18, the actuating device 2 and / or the drive unit 4 is or are formed.

According to a further embodiment, the above-described overcurrent cutoff has an electrical output which is coupled to the safety device 9. In this case, each drive unit 4 may be coupled with an overcurrent shutdown, however, an overcurrent shutdown may also be coupled with a number of drive units 4 or preferably with only one drive unit 4. In the case of an excessive current consumption of the drive unit 4 or an excessive current output of the supply unit 3, a mechanical fault of the furniture or an electrical and / or a mechanical fault of the furniture drive 1 may be present. The overcurrent cutoff has a current measuring point, eg in the form of nes measuring resistor, with connected threshold and amplifier on and detects this excessive current flow and sends an electrical signal to the safety device 9 and / or to the annunciator 10. In one embodiment, the annunciator 10 is electrically coupled to the care LED described above or by the Care LED is formed

In a further embodiment of the safety device 9, this controls a breaker contact. This controlled breaker contact can be designed as an electromechanical relay contact or as an electronic semiconductor contact, via the contacts or via the semiconductor layers of the controlled breaker contact the power supply of the input or the output of the supply unit 3 or the input of a number, all or each drive unit is transmitted. If the safety device 9 detects a fault, it controls the controlled breaker contact, whereupon its contacts open or switch off nonconducting and interrupt or minimize the flow of current to the at least one drive unit 4. In another embodiment, the controlled breaker contact is designed as a manually controllable breaker contact and is integrated according to further embodiments in the housing of the actuator 2 or in a separate housing, which is connected to a cable of the actuator. Here, the manually controllable breaker contact is designed as a normally closed as a kind of emergency stop switch / button. The controlled breaker contact can be designed as manually reversible, as electrically reversible or irreversible breaker contact. Thus, when a fault occurs and is detected, a sleep start of the at least one drive unit 4 is ensured. In addition to the types of display described at the beginning for the occurrence of an error, the non-starting of a motor 4.2 or an adjusting unit or a drive unit 4 can also be understood as an indication or as an announcement of an error. The distribution unit 18 described above is described in an embodiment described above as a T-distributor. This T- distributor has in the simplest form three electrical connections, which can be designed in the form of cable connections and / or pluggable in the form of plug-in connections. In this case, an attachment to the supply unit 3, a connection to the actuation device 2 and a connection to the drive unit 4 are electrically connected. According to various further embodiments, the furniture drive 1 several drive units 4 and / or several supply units 3 and / or have multiple actuators 2. All drive units 4, supply units 3 and actuators 2 can be electrically interconnected by only one distributor unit 18. According to another embodiment, a plurality of distributor units 18 are provided, which are electrically connected to a number of drive units 4, supply units 3 and actuators 2. The simplest embodiment provides at least one distribution unit 18, which is attached separately or on furniture or on a component of the furniture drive 1 or integrated therein. According to another embodiment, the at least one distributor unit 18 may be arranged in the supply unit 3, in the voltage source 8, in the actuating device 2 or in the drive unit 4. Conversely, this means that in another embodiment, the safety device 9 and / or the Meideeänrichtung 10 in the supply unit 3, in the power source 8, in the actuator 2 and / or in the drive unit 1 is arranged or electrically connected thereto.

As indicated at least initially, the furniture drive 1 can be provided with a plurality of actuating devices 2 in different embodiments. The actuators 2 can be formed as a manual switch or as a permanently attached to Möbel switchboard or only accessible to the nursing staff switching device. At least one Betätigungsseänrichtung 2 is to be cared for or sick person available, while other controls 2 can only be available to the nursing staff, as they are arranged, for example, spatially separated from other controls 2 on the furniture. In a further embodiment, a number or all of the actuating devices 2 may have a mechanical and / or an electrical lock. Mechanical lock locks are known, which can be electrically switched, for example, by introducing a mechanical key. Electric lock locks are also known which can initiate lock functions via a key combination or by applying, for example, a magnetic key.

The supply unit 3 or the voltage source 8 described at the beginning can be designed according to different embodiments as a network-dependent or as a grid-independent supply unit 3. Mains-independent supply units 3 have batteries or accumulators which can be connected to upstream charging circuits. Grid-dependent supply units 3 have transformers, eg with so-called El-core transformers, toroidal transformers , 1 - or electronic transformers in the form of switching power supplies with a high frequency transformer, on. The supply units 3 can be introduced directly into a socket according to different embodiments, may have a sealed housing in another embodiment and be designed as a base unit for placement on the floor and / or as a built-in device for installation in the furniture.

LIST OF REFERENCE NUMBERS

1 furniture drive

2 actuating device

3 supply unit

4 drive unit

4.1 engine

5 mains connection

6 connection line

6.1 Main Minus Lead

6.2 Main positive management

6.3 Motor positive conduction

6.4 Control line

6.5 auxiliary min

6.6 Hiifsplus line

7 motor cable

8 voltage sources

8.1 main transformer

9 safety device

10 signaling device

11 message element

11.1 First indicator light

11.2 Second indicator light

11.3 Third indicator light

12 First operating unit

12.1 First motor contact element

12.2 First safety contact element

13 Second operating unit

13.1 Second motor contact element

13.2 Second safety contact element

14 diode unit

14.1 first diode

14.2 Second diode

14.3 Third diode

14.4 Fourth diode

15 safety element

15.1 First safety switch contact 15.2 Second safety switch contact

16 mains switching unit

17 auxiliary voltage source

17.1 Auxiliary voltage transformer

18 distribution unit

19 rectifier bridge

20 smoothing capacitor

21 fuse element

22 primary fuse

23 First protective diode

24 second protection diode

a / b normally closed contact

a / c Schüeßerkontakt

d / e normally open contact

Rl ..6 resistance

Claims

claims

1. First-fail safe electromotive furniture drive (1) with:

at least one drive unit (4) with at least one motor (4.1);

at least one actuating device (2) having at least two actuating units (12, 13), each having a motor contact element (12.1; 13.1) and a safety contact element (12.2; 13.2);

at least one supply unit (3); and

at least one safety device (9),

wherein the furniture drive (1) with a signaling device (10) for the function display and error display of the at least two actuator units (12, 13) and the safety device (9) formed estst.

2. First-fail-safe electromotive furniture drive (1) according to claim 1, characterized in that the motor contact elements (12.1; 13.1) of the at least two actuating units (12, 13) for direct switching of a motor current with the at least one motor (4.1) are connectable.

3. Erstfehiersicherer electromotive furniture drive (1) according to claim 1 or 2, characterized in that the respective one motor contact element

(12.1; 13.1) and a safety contact element (12.2; 13.2) are mechanically coupled together.

4. Erstfehiersicherer electromotive furniture drive (1) according to claim 3, character- ized in that each of a motor contact element (12.1;

13.1) and a safety contact element (12.2; 13.2) can be actuated simultaneously or in succession.

5. First-fail-safe electromotive furniture drive (1) according to one of the preceding claims, characterized in that the safety contact elements (12.2; 13.2) of the at least two actuating units (12, 13) for actuating a safety switching element (15) with the at least one safety device (9) are coupled.

6. ErstfehSicherer electromotive furniture drive (1) according to one of claims 2 to 5, characterized in that the at least one safety device (9) in the actuating device (2), the Versorgungssein- - 2 - unit (3), the voltage source (8), and / or combined arranged in these,

7. First-fail-safe electromotive furniture drive (1) according to claim 6, character- ized in that the flatness contact elements (12.2; 13.2) of the at least two actuator units (12, 13) which form at least one safety device (9).

8. First-fail-safe electromotive furniture drive (1) according to claim 6, character- ized in that the safety contact elements (12.2; 13.2) are in each case electrically connected in series with the corresponding motor contact element (12.1; 13.1).

9. First-fail-safe electromotive furniture drive (1) according to one of the preceding claims, characterized in that the signaling device (10) has optical and / or acoustic signaling elements (11)

10. Erstfehiersicherer electromotive furniture drive (1) according to claim 8, characterized in that the signaling device (10) has light emitting diodes as optical reporting elements (11).

11. First-fail-safe electromotive furniture drive (1) according to claim 9, characterized in that the shunting device (10) has at least one evaluation unit in the form of at least one logic circuit and / or a controller for controlling signaling elements (11).

12. First-fail-safe eiektromotorischer furniture drive (1) according to claim 11, characterized in that the signaling device (10) has at least one diode unit (14) as an evaluation unit.

13. First-fail-safe electromotive furniture drive (1) according to claim 8 or 9, characterized in that the signaling device (10) has at least one light-emitting diode with a high-impedance resistor (R3, R5, R6).

14. First-fail-safe electromotive furniture drive (1) according to one of the preceding claims, characterized in that the safety insert - - Direction (9) Part of a Netzschaiteinheit (16) with Hilfsspannungsquel- Ie (17) is.

15. First-fail-safe electromotive furniture drive (1) according to claim 14, characterized in that the auxiliary voltage source (17) is a network-connected auxiliary voltage transformer (17.1).

16. First-fail-safe electromotive furniture drive (1) according to claim 14, characterized in that the auxiliary voltage source (17) is a battery, a rechargeable battery and / or a capacitor with high capacity.