Patent ID: 7687694

Claim:
A grand piano piano action comprising: a repetition base; a jack; a balancier; a heel; a balancier regulating button; and a jack regulating button; wherein, said repetition base comprises: a main beam; a balancier support beam; a balancier regulating button stop; and an integrated jack regulating button stop; wherein, said main beam is elongated with a center of rotation end and a jack end, with a hinge pin hole in each end, said balancier support beam is elongated with a hinge pin hole in one end and is connected to said main beam at the other end, to form an acute angle connection ( 235 ) measuring 5-45 degrees, wherein said balancier support beam is angled towards said jack end of said main beam, said integrated jack regulating button stop stands essentially planar with the longitudinal axes of said main beam and said balancier support beam, and is integrated into the structure of said main beam, and said balancier regulating button stop is a flat area located on the upper surface of said center of rotation end of said main beam, and said heel is essentially rectangular prism shaped and attached to the lower surface of said repetition base with its longitudinal axis parallel with that of said main beam.