Patent ID: 6943283

Claim:
A stringed instrument comprising, a sound box defining an inner space, the sound box comprising a bottom board, a sound board and a side wall, the bottom board, sound board and side wall each having an inner surface which faces the inner space, the side wall being between the bottom board and the sound board, wherein the bottom board and the sound board each have an periphery and the side wall has an upper periphery and a lower periphery, the periphery of the sound board being connected to the upper periphery and the periphery of the bottom board being connected to the lower periphery, the sound board comprising a plurality of elongated braces facing the inner space, the braces having a length, a thickness and a height, the height being relative to the inner surface of the sound board, wherein the height of the braces varies along their lengths and wherein at least two braces cross, the crossing braces defining an intersection between the two braces, wherein at the intersection a valley is formed in one brace and a tunnel is formed in the other brace, the two braces being independent from one another, such that moment forces, which are in or parallel to the plane of the sound board, are not transferred there between.