Patent ID: 7067730

Claim:
A keyboard musical instrument for generating tones, comprising: a keyboard including plural keys used for specifying pitches of tones to be produced, applied with moments urging said plural keys to rest positions thereof and having respective bars, each formed with at least one through-hole having a narrow portion and wide portions continuous to both ends of said narrow portion and exposed to side surfaces of said bar, each of said plural keys having at least one key balancer for applying a regulative moment to said each of said plural keys for varying the moment, said at least one key balancer having a weight piece made of non-lead material and embedded in the bar of said each of said plural keys and an anchor for fastening said weight piece to said bar of said each of said plural keys, said weight piece having a pair of weight sub-pieces each received in one of said wide portions and a part of said narrow portion so that said anchor fastens said weight sub-pieces to said bar; and a tone generating system connected to said plural keys, and generating said tones with said pitches.