Operating device for an electrically height-adjustable table, drive system and method for adjusting the height of a tabletop of the table

1. An operating device for an electrically height-adjustable table having at least one electrical drive for a height adjustment of a table top of the table, and a controller coupled to the drive for controlling the drive, the operating device comprising

an actuating element to be arranged in the region of the tabletop;

a force sensor that is designed to measure a force acting on the tabletop; and

an evaluation circuit that is coupled to the force sensor and that is designed:

to detect an actuation of the actuating element while the height adjustment of the tabletop is blocked, in particular, mechanically blocked;

to receive measurement values from the force sensor in a predetermined period of time after the detected actuation;

to determine a force alteration value from the received measurement values; and

if the force alteration value is greater than a threshold value, to output a control signal to the controller, the signal initiating the height adjustment of the tabletop in a direction that depends on a sign of the force alteration.

2. The operating device of claim 1 , in which no electric power is applied to a motor of the drive during the blocking of the height adjustment.

3. The operating device of claim 1 , in which the force sensor is designed to measure a force acting between the drive and the tabletop.

4. The operating device of claim 1 , further comprising an additional actuating element to be arranged in the area of the tabletop, wherein the evaluation circuit is designed to initiate a height adjustment of the tabletop only if actuation of both actuating elements is detected during the blocking of the height adjustment of the tabletop.

5. The operating device of claim 1 , in which the evaluation circuit is designed to output a control signal having speed information for the height adjustment, wherein the speed information depends on a magnitude of the force measured by the force sensor.

6. The operating device of claim 1 , in which the evaluation circuit is designed to output the control signal for height adjustment to the controller only for as long as an actuation of the actuating element is detected.

7. The operating device of claim 1 , wherein the actuating element comprises a touch-sensitive sensor or a capacitive sensor.

8. The operating device of claim 7 , in which the touch-sensitive sensor or the capacitive sensor, respectively, is formed by a conductive area, in particular made from a conductive paint.

9. An electrically adjustable table comprising an operating unit according to claim 8 , the at least one electrical drive for height adjustment of the tabletop, and the controller coupled to the drive for controlling the drive, wherein the conductive surface is arranged on a surface of the tabletop or under a coating of the tabletop, particularly a coating made of plastic or veneer.

10. The table of claim 9 , wherein the evaluation circuit is mounted via a screw connection on the tabletop, wherein an electrical connection between the evaluation circuit and the conductive surface is established via the screw connection, in particular established exclusively thereby.

11. A drive system for an electrically height-adjustable table, the drive system comprising an operating device according to claim 1 , the at least one electrical drive for height adjustment of the tabletop of the table, and the controller coupled to the drive for controlling the drive, wherein the drive has a motor electronics unit arranged on the motor of the drive and comprising the controller and the evaluation circuit.

12. The drive system of claim 11 , in which the motor electronics unit, the actuating element and the force sensor are connected to one another via a bus system.

13. The operating device of claim 1 , wherein the force alteration value is an absolute force alteration or a force gradient.

14. A method for adjusting the height of a table top of a table having an actuating element arranged in the region of the tabletop, and a force sensor that is designed to measure a force acting on the tabletop, the method comprising:

detecting an actuation of the actuating element while a height adjustment of the tabletop is blocked, more particularly mechanically blocked;

receiving measurement values from the force sensor in a predetermined period of time after the detected actuation;

determining a force alteration value from the received measurement values; and

if the force alteration value is greater than a threshold value, performing a height adjustment of the tabletop in a direction that depends on a sign of the force alteration value.

15. The method of claim 14 , wherein no electric power is applied to a motor of the drive during the blocking of the height adjustment.

16. The method of claim 14 , wherein the force sensor measures a force acting between the drive and the tabletop.

17. The method of claim 14 , wherein the table has an additional actuating element arranged in the region of a tabletop, and wherein the height of the tabletop is adjusted only if an actuation of both actuating elements is detected during the blocking of the height adjustment of the tabletop.

18. The method of claim 14 , wherein the height adjustment of the tabletop is performed at a speed that depends on a magnitude of the force measured by the force sensor.

19. The method of claim 14 , wherein the height of the tabletop is adjusted only as long as an actuation of the actuating element is detected.

20. The method of claim 14 , wherein the force alteration value is an absolute force alteration or a force gradient.