Abstract: A device for generating directed vibrations has two centrifugal weights which are independently driven at the same speed of rotation but in opposite directions. The centrifugal weights are supported on a largely stiff carrier secured by a holder to a bracket. The holder allows the carrier to move relative to the bracket. When the centrifugal weights start moving, they become synchronized within a short period of time and generate vibrations which can be used in the desired manner via the bracket.

Abstract: A device for receiving formwork elements used to manufacture concrete elements has a bearing static structure and a flat formwork joined therewith which can be driven to vibrate by an exciting device in order to compact the still-plastic concrete. The sound-insulating joining devices are inserted between the formwork shell and the static structure. The exciting device bypasses the joining device and acts directly or indirectly on the formwork shell.

Abstract: A tool having an operating element that is driven by an integrated power drive for the percussive, pounding or vibratory loading of a material to be worked, in particular a tamper, a vibration plate or a vibration roll for ground compaction or a hammer for breaking and/or drilling operations, can be guided using a handle. This handle is actively vibration-damped by at least one actively controlled or regulated compensation element, which counteracts the transmission of a vibration to the handle and which, depending on the vibration that can be transmitted to it and is produced in and/or on the tool, produces a compensating force and/or movement in the potential vibration transmission path from the location of production of the vibration to the handle.