Patent ID: 7999164

Claim:
A valve mechanism for musical instrument inserted between a mouthpiece and a bell, the valve mechanism comprising: a main tube through which the mouthpiece and the bell directly communicate with each other; a changeover valve inserted in the middle of said main tube; a bypass tube which takes a bypass route from the middle of said main tube and, when said changeover valve is operated, causes indirect communication of said main tube which is in direct communication before the operation of said changeover valve; a main valve group composed of main valves inserted in serial communication in the middle of said main tube on a mouthpiece side or a bell side of said changeover valve; a sub valve group composed of the same number of sub valves as the number of the main valves of said main valve group, inserted in serial communication in the middle of said bypass tube; and a link mechanism group composed of the same number of link mechanisms as the number of the main valves of said main valve group, wherein: the main valves composing said main valve group, the sub valves composing said sub valve group, and the link mechanisms composing said link mechanism group correspond to one another; by operating each of the main valves, the corresponding sub valve is operable in linkage via the corresponding link mechanism; and said bypass tube is set to such a length that a note one octave lower than a note produced only by said main tube is producible when said main tube is brought into the indirect communication.