Patent ID: 8895822

Claim:
An action of an upright piano comprising: a key, an action rail extending horizontally in the right-and-left direction from the perspective of a piano player's side, a whippen rotatably supported by the action rail and located on a rear end of the key, a jack rotatably supported by the whippen, a hammer butt to be pushed up by the jack, a hammer supported by the hammer butt, and a string to be hit by the hammer; a guiding member that extends longitudinally along said action rail and is secured to a surface of said action rail; a guided member that is slidable along said guiding member, said hammer butt being rotatably supported by a hammer-butt flange, the hammer-butt flange being secured to the guided member, with the guided member disposed between the hammer-butt flange and the guiding member, and with the guiding member disposed between the guided member and the surface of the action ran, wherein said guided member is connected to a pedal rod via a joint member, the pedal rod being connected to a pedal; and an elastic member that biases said guided member in a right or left direction from the perspective of the piano player's side, wherein a force applied by a piano player to said pedal acts on said guided member through said pedal rod and said joint member, the force acting on said guided member having a direction that is opposite to the direction of a bias force applied by said elastic member.