Loading patent…
AssigneeYamaha Corporation
InventorsAkio Yamamoto, Kazushi Nakai, Tatsuya Hiraku, Toshiharu Fukushima
Estimating the term…
A method of fabricating a bow stick includes winding a prepreg, in which a fiber is impregnated with a resin, on a mandrel with a diameter gradually decreasing toward a distal end, setting a semi-fabricated product, in which the prepreg is wound on the mandrel, into a mold and molding the semi-fabricated product in a shape corresponding to a cavity formed between the mold and the mandrel by heating and pressurizing the semi-fabricated product in the mold, and taking out the mandrel from a molded product molded in the shape corresponding to the cavity to acquire a long and hollow stick body. When adjusting at least one of a weight distribution, a center of gravity, and a weight of the stick body, the volume of the cavity is changed using the mandrel of which the diameter or the diameter variation is gradually changed in an axis direction.
1-4. (canceled)
A bow stick of a stringed instrument which is used with a stringed instrument and which is formed of fiber-reinforced plastics, the bow stick comprising:
A method of fabricating a hollow bow stick body which is used with a stringed instrument, the method being carried out by molding the bow stick body in a cavity formed between a mold and a mandrel, the method comprising:
An elongated, hollow bow stick which is used with a stringed instrument, the bow stick comprising:
Dependencies are inferred from the claim text.