Patent ID: 6288313
Filing Date: 2001-09-11
Classification: G10C

Abstract:
An acoustic keyboard musical instrument in the category of a grand piano comprisinga housing having an upper opening,a front cover board turnable with respect to said housing and assigned a front part of said upper opening,plural music strings stretched inside of said housing and assigned notes of a scale, respectively,a sound board supported by said housing and extending under said plural music strings,a bass bridge mounted on said sound board and giving tension to the music strings serving as a part of said plural music strings and assigned to lower registered acoustic sounds,a treble bridge mounted on said sound board and giving tension to the music strings serving as another part of said plural music strings and assigned to other lower registered acoustic sounds and to higher registered acoustic sounds,a keyboard exposed to a player and having plural keys assigned said notes of said scale, respectively,plural vibration generating mechanisms respectively linked with said keys and selectively actuated by the associated keys manipulated by said player for producing acoustic sounds through vibrations of said associated music strings, anda split top board having plural sub-boards respectively assigned parts of said upper opening and independently changed between open positions where associated parts of said plural music strings are open to the ambience and closed positions where said associated parts are covered with the associated plural sub-boards.