Abstract: The invention relates to a percussion instrument for games with percussively or impact-moved play body. According to the invention, the percussion instrument comprises an actuating part (BT) and an impact section (PT) embodied at least partially as a dimensionally stable solid body interacting with the play body in a directly dynamic manner. A plurality of excellent spatial areas and/or flat areas and/or linear areas are provided in order to enable a structure to be made, said structure having an improved adaptation to the vibrational behaviour to the events involved in the playing actions and the requirements and particularities of the player.

Abstract: A sliding device, in particular a ski, comprises a sliding body and means on the sliding body for controlling vibration thereof. The controlling means comprises at least one sequence of a plurality of spatial, planar or linear areas, each of which is distinguished from at least a part of its vicinity by at least one differently dimensioned or distributed vibration parameter. The center distances between subsequent distinguished areas, or the distances between certain sections within subsequent distinguished areas, is dimensioned according to at least one predetermined increasingly or decreasingly varying progression. The increasingly or decreasingly varying distances are configured such that the areas establish a vibration active structure of the sliding body with a plurality of natural or resonant frequencies.

Abstract: A vibrating body for producing vibrations in the audible frequency range, has a non-uniform thickness and comprises a sound board having an axis. A first series of areas of reduced thickness is formed on the sound board at different distances from the axis and from each other. A first one of the areas of reduced thickness is spaced apart from a second one of the areas of reduced thickness by a first distance. The second area of reduced thickness being spaced apart from a third one of the areas of reduced thickness by a second distance. The third area of reduced thickness being spaced apart from a fourth one of the areas of reduced thickness by a third distance. The first distance and the second distance and the third distance vary in a harmonic progression.