Patent ID: 8727660

Claim:
Arrangement for providing a pulsing compressive force, comprising a) an exciter part with an unbalance exciter for producing an intermittent exciter force and with a contact surface for transmitting a force component of the exciter force, directed perpendicularly to the contact surface, as a pulsing compressive force, to a tool or a work surface to be impinged with the compressive force, and b) a vibration damper part which is connected to the exciter part by means of a spring damper unit, for forming a system capable of being excited to resonant oscillations by the unbalance exciter, characterized in that the arrangement has an idle part which is connected to the exciter part or to the vibration damper part in such a way that it forms a contiguous unit with the exciter part or the vibration damper part, but is however substantially decoupled from them in terms of oscillations, the arrangement is further adapted to vary during operation the spring stiffness (k 2 ) of the spring damper unit, the damping (d 2 ) of the spring damper unit, the spring pre-load of the spring damper unit, and the arrangement is formed in such a way that a variation of the mass (m 2 ) of the vibration damper part, the mass moment of inertia of the vibration damper part, the mass (m 1 ) of the exciter part, and/or the mass moment of inertia of the exciter part is possible by exchanging one or more liquid volumes between the idle part and the exciter part and/or the vibration damper part.