Patent ID: 7141728

Claim:
An action part for a piano, which is pivotally moved along with depression of a key to thereby transmit key depression energy generated by depression of the key, to a hammer, wherein the action part is a wippen pivotally moved by being pushed up by the key depressed, and is formed by a thermoplastic resin molded article that is molded by a long fiber process and contains long fibers for reinforcement, wherein the wippen comprises: a main body that extends in a front-rear direction, and includes a front part, a rear part pivotally supported about a horizontal axis, and a central part located between said front part and said rear part, and having a vertical length larger than those of said front part and said rear part, a heel section for being pushed up by the key, said heel section protruding downward from said central part of said main body, and being continuous with said front part and said rear part of said main body via respective transition portions having obliquely linear or curved lower surfaces, and a recess formed in at least one of said main body and said heel section, for reducing a weight of the at least one of said main body and said heel section, and wherein said recess is continuously formed in said main body and said heel section.