Patent ID: 7129404

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, said at least one through-hole having a narrow portion and wide portions diverging from 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 fixing said weight piece to said bar of said each of said plural keys, said weight piece having a tube member received in said at least one through-hole and a core member received in said tube member, both end portions of said tube member being plastically deformed so as to be held in tight contact with said wide portions of said bar as said anchor; and a tone generating system connected to said plural keys, and generating said tones with said pitches.