Abstract: A height-adjustable office furniture comprising a table top, at least one height adjustable leg unit and a drive unit to drive adjustment of the height of the leg, a drive control system configured to control and power the drive unit and an anti-collision system connected to the drive control system and configured to detect when movement of the table top along the vertical direction Z is blocked. A resilient element is provided in the connection between the drive unit and the table top, the resilient element defining a suspension travel extending along a vertical direction Z to reduce vibrations.

Abstract: An extension device for spraying devices has an extension unit, which has, at a first end, a spraying head having at least one material outlet nozzle and, at a second end, means for connecting a spraying device. The extension device is characterized in that the extension unit has a metering and shut-off valve, which has a valve seat element having a valve opening and which has a valve body, that the valve body is arranged between the spraying head and the valve seat element, and that the valve body is fastened to a tension-transmitting element, which extends through the valve opening. The invention further relates to a spraying device for spraying material onto surfaces, with the spraying device having such an extension device.