EP4240203A1 - Electrically adjustable piece of furniture with at least one electrical drive motor - Google Patents
Electrically adjustable piece of furniture with at least one electrical drive motorInfo
- Publication number
- EP4240203A1 EP4240203A1 EP21810286.1A EP21810286A EP4240203A1 EP 4240203 A1 EP4240203 A1 EP 4240203A1 EP 21810286 A EP21810286 A EP 21810286A EP 4240203 A1 EP4240203 A1 EP 4240203A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- furniture
- piece
- reed switch
- drive motor
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 102
- 230000033001 locomotion Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B9/00—Tables with tops of variable height
- A47B9/04—Tables with tops of variable height with vertical spindle
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B2200/00—General construction of tables or desks
- A47B2200/0035—Tables or desks with features relating to adjustability or folding
- A47B2200/005—Leg adjustment
- A47B2200/0056—Leg adjustment with a motor, e.g. an electric motor
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B2200/00—General construction of tables or desks
- A47B2200/0035—Tables or desks with features relating to adjustability or folding
- A47B2200/005—Leg adjustment
- A47B2200/0061—Height-adjustable desk, electronically regulated with no mechanical link between the legs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B2200/00—General construction of tables or desks
- A47B2200/0035—Tables or desks with features relating to adjustability or folding
- A47B2200/005—Leg adjustment
- A47B2200/0062—Electronically user-adaptable, height-adjustable desk or table
Definitions
- the invention relates to an electrically adjustable piece of furniture which has at least one electric drive motor for adjusting at least one furniture adjustment section relative to a furniture support section.
- WO 2019/086071 A2 discloses a height-adjustable table whose height can be adjusted via an electric drive motor on a left and a right table leg.
- the two drive motors are synchronized during the adjustment to ensure that the table top remains level during the movement.
- sensor signals from sensors on the drive motors are evaluated.
- Hall sensors on the first drive motor which are used to determine the current height and speed.
- a gyro/gravity sensor is located on the second drive motor.
- the invention is based on the object, the current position of an electrically driven To determine binverstellabitess in a piece of furniture with high reliability and low energy consumption.
- the piece of furniture according to the invention is designed to be electrically adjustable and comprises at least one furniture adjustment section which can be adjusted relative to a furniture support section, the adjustment being carried out with the aid of at least one electric drive with an electric drive motor.
- the piece of furniture is also provided with a sensor device with which the movement and/or the position of the furniture adjustment section can be determined.
- a component of the sensor device is a permanent magnet which is connected in a torque-proof manner to the drive shaft of the drive motor. If necessary, the permanent magnet can also be connected to a rotating component which is driven by the drive shaft.
- the sensor device also includes a sensor element as a signal receiver, in which a sensor signal can be generated that depends on the magnetic field of the permanent magnet as the signal transmitter.
- the permanent magnet When the drive motor is actuated, the permanent magnet performs a rotational movement, which also changes the magnetic field that emanates from the permanent magnet in relation to the sensor element. This change in the magnetic field is registered by the sensor element as a sensor signal, it being possible to deduce the number of revolutions of the component on which the permanent magnet is located from the number of signals generated. From the number of revolutions, the current position of the paperverstellabitess and optionally also on the movement in the form of the speed of housingverstellabites are closed. The current position preferably relates to the position of the furniture adjustment section relative to the furniture support section. If necessary, an absolute position of the furniture adjustment section relative to the floor on which the piece of furniture is standing can also be considered.
- the electric drive for adjusting the furniture adjustment section includes the electric drive motor, the sensor device and a spindle driven by the drive motor and a gear that may be present.
- the sensor element is designed as a reed switch whose switching position can be switched by the magnetic field of the permanent magnet.
- the reed switch which is arranged non-rotatingly, is switched between a closed switching position and an open switching position by the moving magnetic field of the rotating permanent magnet.
- the reed switch is in the open switch position when the permanent magnet is turned away and is briefly moved to the closed switch position when the permanent magnet moves past, with the reed switch then being opened again as the permanent magnet is removed and the magnetic field weakens.
- the reed switch is able to register each revolution of the permanent magnet and thus also the drive shaft, resulting in the current position of the binverstellabites and possibly also on the movement or Speed of binverstellabites can be closed.
- the reed switch is connected to its own power source independent of a drive motor controller.
- the reed switch is therefore not dependent on the power supply of the controller, but works independently of the controller, which includes power electronics for controlling the drive motor.
- the circuit In the closed switch position, the circuit is closed with the voltage source associated with the reed switch, with the current flowing representing an electrical signal that characterizes a revolution of the permanent magnet.
- the electrical signal that is generated when the reed switch is closed is sent to a processor, in which the signal is processed to determine the current position of the furniture adjustment section. If the device is intact, the processor communicates with the controller, which controls the electric drive motor.
- the reed switch Even when the reed switch is open, a possibly reduced voltage or the voltage value zero can be present, which can also be evaluated as a signal and evaluated in the processor.
- the processor is also connected to the power source independent of the drive motor controller, to which the reed switch is connected.
- the sensor device is functional and able to determine the current position of the furniture adjustment section independently of the status of the controller or the power supply of the controller. Accordingly, a failure of the controller or the power supply of the controller does not lead to a failure of the sensor device.
- This design also has the advantage that the reed switch and the processor consume only minimal energy.
- the reed switch is assigned a storage element in which the sensor signals can be stored.
- the memory element is also independent of the controller or the energy supply of the controller, so that the sensor signals stored in the storage element are available at any time. An accidental or intentional failure of the power supply to the controller does not lead to the loss of the memory information, so that the information about the position of the furniture adjustment section is retained. Accordingly, if the power supply to the controller is interrupted, the drive device with the drive motor does not have to be readjusted, but the information stored in the memory element with the sensor signals can be accessed from which the current position of the furniture adjustment section can be determined.
- the memory unit assigned to the reed switch is designed, for example, as a flash memory or as an EEPROM. The memory unit can optionally be located in the processor.
- the energy consumption of the reed switch is significantly reduced compared to other sensor elements, such as Hall sensors.
- the circuit to the voltage source of the reed switch is broken, no current flows and accordingly there is no energy consumption. Only when the reed switch is closed is the circuit closed and energy consumed.
- the Reed switch connected via a high-impedance resistance element to its own voltage source, which has a resistance of at least 1 MQ, for example. The current flow and the energy consumption are reduced accordingly.
- the sensor device includes two reed switches that are switched on and off by the same permanent magnet.
- the two reed switches are offset from one another in the circumferential direction, so that as the permanent magnet rotates in the reed switch, sensor signals that are offset in time can be generated, from which the direction of rotation of the drive motor can be inferred.
- a voltage source that is independent of the controller is assigned to each reed switch, a common voltage source for both reed switches that is independent of the controller possibly also being considered.
- the two reed switches are switched in opposite directions, so that a first reed switch is moved from the open to the closed switch position when the permanent magnet rotates, and the second reed switch is moved from the closed to the open switch position when the permanent magnet rotates.
- the reed switches it is also possible for the reed switches to be switched in sync. In any case, the direction of rotation can be deduced from the time profile of the signals.
- a first resistance element is advantageously in the form of a high-impedance resistance element with a resistance of, for example, at least 1 M ⁇ educated ;
- the reed switch is connected to its own voltage source via this high-impedance resistance element.
- the parallel, second resistance element has a significantly lower resistance, which is, for example, at most 1% or at most 1 k» of the high-impedance resistance element.
- the second resistance element has a resistance of, for example, 1 k ⁇ .
- the reed switch is connected to a further voltage source, in particular to the controller voltage, via the second resistance element.
- the sensor device includes exactly one permanent magnet as a signal transmitter.
- This is advantageously arranged eccentrically in relation to the axis of rotation of the drive shaft of the drive motor or of the rotating component which is driven by the drive shaft and on which the permanent magnet is arranged.
- it is sufficient to have just one Provide permanent magnets as signal transmitters.
- it is also possible to arrange a plurality of permanent magnets as signal transmitters, for example two permanent magnets arranged offset in the circumferential direction.
- the piece of furniture is equipped with at least one electric drive motor, via which the furniture adjustment section can be adjusted in relation to the furniture support section. It may be expedient to provide exactly one drive motor or more than one drive motor, for example at least two electric drive motors for adjusting the same furniture adjustment section or for adjusting different furniture adjustment sections. In the case of several electric drive motors, one or more reed switches are advantageously assigned to each drive motor.
- the voltage source of the reed switch is designed as a battery, which is arranged in or on or on the drive motor controller. If the voltage source of the controller fails, position information can still be obtained as long as the drive motor and the controller are connected to each other.
- the reed switch can be arranged on a circuit board, which optionally also accommodates the storage element for storing the sensor signals. Furthermore, a processor can be located on the circuit board, in which the sensor signals are processed and via which the processed sensor signals can be forwarded to the controller.
- the memory element can be integrated into the processor, in particular when the memory element is designed as a flash memory or as an EEPROM.
- the piece of furniture is, for example, a table in which the table leg or legs form the furniture support section and the tabletop forms the furniture adjustment section, which can be adjusted in height and/or in inclination relative to the table leg or legs.
- other pieces of furniture can also be considered that have an electric drive motor and an adjustable furniture adjustment section as well as a furniture support section, for example chairs, armchairs, sofas, beds, TV lifts, work tables, box lifters, height-adjustable frames for the industrial sector or the like.
- a drive motor can be controlled exclusively as a function of sensor signals from one or more reed switches, whereas the at least one other drive motor can be controlled exclusively by evaluating gyro/gravitational sensor signals.
- the drive motor with the reed switch can, for example, be controlled in such a way that it maintains a desired speed, whereas the other drive motor with the gyro/gravitational sensor is controlled in such a way that the furniture adjustment section maintains a desired inclination, for example a table remains straight.
- communication takes place between the processor in the drive, which is assigned to the reed switch, and the controller or a processor in the controller via the input or inputs that are originally designed for processing sensor signals from a Hall sensor.
- the inputs on the processor that were originally intended for the sensor signals of a Hall sensor can be used for data exchange between the drive and the controller.
- the sensor signals of the reed switch are fed to the processor via separate connections.
- the data exchange between the drive and the controller can be unidirectional or bidirectional.
- the data supplied by the drive includes information on the position of the furniture adjustment section, for example by the data containing a specific number of revolutions of the drive motor, optionally with the direction of revolution, an absolute level or number of pulses. It can be advantageous to also transmit further information from the drive to the controller, for example information on the maximum electric current of the drive motor , the nominal speed of the drive motor , the maximum stroke of the drive motor , the current temperature of the drive motor , the resolution of the sensor signals and the like . Information on the type of drive motor and the manufacturer may also be transmitted via data transmission or Communication lines are transferred to the controller.
- a new reference run is requested by the controller of the drive motor.
- the processor or the controller counts the sensor impulses of the reed switch and uses this to determine the current position in relation to a reference position that was actuated beforehand. This ensures that the position information is again available to the drive and, for example, it can be assessed at what height an adjustable tabletop is located.
- Fig. 1 a detail of a table in a side view as an adjustable piece of furniture, the height of the table top being adjustable in relation to a table leg via an electric drive motor,
- FIG. 2 the table according to FIG. 1 with raised table top
- Fig. 3a shows a basic representation of a sensor device for determining the movement and position of the furniture adjustment section based on the rotation of a drive shaft of the drive motor, two reed switches being used as sensor elements, which are aligned radially,
- Fig. 3b a figure. 3a corresponding representation with axially aligned reed switches
- Fig. 4 shows a circuit diagram of the sensor device with a reed switch.
- the same components are provided with the same reference symbols.
- a table 1 with a table top 3 on a table leg 2 is shown as an exemplary embodiment of a piece of furniture.
- the table leg 2 forms a furniture support section
- the table top 3 forms a furniture adjustment section, with the table top 3 being arranged such that it can be adjusted in height relative to the table leg 2 .
- the height is adjusted with the aid of an electric drive motor 4 which is arranged on the underside of the table top 3 on a guide part 3a which protrudes into the table leg 2 and is guided in the table leg 2 in such a way that it can be displaced.
- the drive motor 4 causes a shaft 5 to rotate, which meshes with an associated counter-thread in the table leg, the shaft 5 being axially fixed in place to a guide part 3a, whereby the desired height adjustment of the tabletop 3 is effected when the shaft 5 rotates.
- the height of the table top 3 can be adjusted as indicated by arrow 8 by actuating the drive motor 4 .
- the control device 6 includes a controller and a sensor device 7, whose sensor signals are processed in the controller to control signals with which the drive motor 4 is controlled.
- the electric drive motor 4 can be controlled in both directions of rotation to a corresponding lifting movement of the table top 3 up or down. to effect below.
- the sensor device 7 includes one or two reed switches for determining the height position of the table top 3 relative to the table leg 2 . the the reed switches are arranged on the drive motor 4 or on a gear of the drive motor 4 . This allows the rotational movement of the drive motor to be recognized, it being possible to deduce the height position from the rotational movement.
- the height of the table top 3 can be adjusted by means of two, possibly three or more drive motors 4 , with the drive motor being arranged on a table leg 2 .
- the first drive motor 4 can be assigned a sensor device with a reed switch, while the other, opposite drive motor is assigned a sensor device with a gyro/gravity sensor.
- FIG. 3a and 3b shows a schematic representation of the drive shaft 9 of the drive motor, which is rotatable about the longitudinal axis of the motor shaft.
- the drive shaft 9 is a carrier of a permanent magnet 10 with a north-south orientation (N-S), preferably in the radial direction.
- the permanent magnet 10 is arranged eccentrically in relation to the longitudinal axis of the motor shaft.
- the sensor device 7 comprises a circuit board 11 with two reed switches 12 arranged on the circuit board, which each form a sensor element, and a processor 13 for recording and processing information of the sensor signals of the reed switches 12 .
- the reed switches 12 are arranged at a distance from one another in the circumferential direction and point in the direction of the permanent magnet 10 .
- the reed switch 12 are between switched to a closed and an open switch position.
- the signals are transmitted from the processor 13 to the controller 14 , via which the electric drive motor with the drive shaft 9 is controlled.
- the reed switches 12 are aligned radially and are radially at a distance from the permanent magnet 10.
- the reed switches 12 are aligned axially and are radially at a distance from the permanent magnet 10.
- Fig. 4 shows an electrical circuit with a reed switch 12 .
- the reed switch 12 is connected via a first resistance element 17 to its own voltage source 18, which supplies a 3 V voltage, for example.
- a diode 19 with forward direction from the voltage source 18 to the reed switch 12 is located between the first resistance element 17 and the voltage source 18 .
- the first resistance element 17 has a high resistance of, for example, 1 M ⁇ .
- a second resistance element 15 In parallel with the first resistance element 17 in the circuit is a second resistance element 15 with a significantly lower resistance of, for example, 1 k ⁇ .
- the reed switch 12 is connected via the second resistance element 15 to the controller voltage 16 of the controller, which at this position is of the same order of magnitude as the voltage source 18 and is 3 V, for example.
- a diode 20 with forward direction from the controller voltage 16 to the reed switch 12 is located between the second resistance element 15 and the controller voltage 16 .
- With reference sign 13 is shown in FIG. 4 the connection to the input of the processor 13 denoted .
- the potential at the processor 13 is at the "+" level of the voltage source 18, minus the voltage drop across the diode 19, when the reed switch 12 is closed, it is at the "-" level of the voltage source 18.
- the reed switch 12 is designed, for example, in such a way that the reed switch 12 is in the open switching position when the magnetic field is only weak.
- the increasing magnetic field causes the reed switch 12 to move from the open to the closed switch position.
- the circuit between the voltage source 16 and the reed switch 12 via the resistance element 15 and on the other hand between the battery voltage 18 and the reed switch 12 via the further resistance element 17 is closed. Due to the significantly lower resistance in the resistance element 15, a significantly higher current occurs in this circuit, which is correspondingly less susceptible to disruption and superimposition, for example due to induced currents that arise during operation of the drive motor.
- the controller voltage 16 fails, the voltage source 18 is available and a sensor signal can be generated accordingly in this branch.
- the reed switch 12 switches between the open and the closed switch position each time the permanent magnet 10 rotates.
- connection to the controller voltage 16 can also be dispensed with.
- the circuit consists only of the reed switch 12, the first resistance element 17 and the voltage source 18, which is in particular a battery. Due to the high resistance in the first resistance element 17, only very low currents flow, so that the voltage source 18 is also only correspondingly slightly loaded.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020129397.6A DE102020129397A1 (en) | 2020-11-09 | 2020-11-09 | Electrically adjustable piece of furniture with at least one electric drive motor |
PCT/EP2021/025434 WO2022096155A1 (en) | 2020-11-09 | 2021-11-08 | Electrically adjustable piece of furniture with at least one electrical drive motor |
Publications (3)
Publication Number | Publication Date |
---|---|
EP4240203A1 true EP4240203A1 (en) | 2023-09-13 |
EP4240203B1 EP4240203B1 (en) | 2024-01-03 |
EP4240203C0 EP4240203C0 (en) | 2024-01-03 |
Family
ID=78676541
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21810286.1A Active EP4240203B1 (en) | 2020-11-09 | 2021-11-08 | Electrically adjustable piece of furniture with at least two electrical drive motors |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4240203B1 (en) |
DE (1) | DE102020129397A1 (en) |
WO (1) | WO2022096155A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7003828B2 (en) * | 2004-06-25 | 2006-02-28 | Carroll Hospital, Inc. | Leveling system for a height adjustment patient bed |
US8584281B2 (en) * | 2011-04-07 | 2013-11-19 | Mizuho Orthopedic Systems, Inc | Surgery table having coordinated motion |
DE102013104538B4 (en) * | 2013-05-03 | 2015-05-21 | MAQUET GmbH | Operating table and method for controlling an operating table |
CN106482753B (en) * | 2016-09-23 | 2019-04-16 | 嘉兴礼海电气科技有限公司 | The driver and control system of position accumulated error can be eliminated automatically |
DE102017125390A1 (en) | 2017-10-30 | 2019-05-02 | Karsten Laing | Method for detecting the occupancy state of at least one piece of furniture and electrically adjustable piece of furniture |
-
2020
- 2020-11-09 DE DE102020129397.6A patent/DE102020129397A1/en active Pending
-
2021
- 2021-11-08 WO PCT/EP2021/025434 patent/WO2022096155A1/en active Application Filing
- 2021-11-08 EP EP21810286.1A patent/EP4240203B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
DE102020129397A1 (en) | 2022-05-12 |
EP4240203B1 (en) | 2024-01-03 |
EP4240203C0 (en) | 2024-01-03 |
WO2022096155A1 (en) | 2022-05-12 |
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