Patent ID: 9190038
Filing Date: 2015-11-17
Classification: G10D

Abstract:
1. A tension adjustment hoop for tensioning a resonant skin with a ring on a musical instrument, the tension adjustment hoop being formed by a ring with a centre axis and with retention means arranged to interact with coupling means on the musical instrument for retention of the tension adjustment hoop, the tension adjustment hoop having an opposing top side and bottom side, wherein the tension adjustment hoop comprises an inner fluid channel, provided with a pressure adjustment connection in hydraulic connection with the fluid channel, and a plurality of pistons, each in hydraulic connection with the fluid channel, each with a free end opposite the fluid channel, each positioned for abutting a ring of a resonant skin of a musical instrument, and each, under the influence of the pressure in the fluid channel, being displaceable in a direction parallel to the centre axis of the tension adjustment hoop between a first extreme position, where the free end is level with the bottom side, and a second extreme position, where the free end is outside the bottom side.