Device for facilitating adjustment of the action of an upright piano includes regulating screw and rod for adjusting the tension of a sprung steel device stretched from front part of felt

摘要

The device includes a first elastic device (40) such as sprung steel stretched from at least a front part of a felt (19) stuffing (20). A second device consisting of a rod (46) and a screw (47) regulates the tension of the first elastic device, while a third device (42,43) regulates the position of the first elastic device relative to the felt.