| 摘要 |
first to second pedal supporters secured on the center portion of the bottom surface of a piano; a pedal box including a pedal box upper plate which is secured on the bottom ends of first to third pedal supporting bars, first to third pedal middle ends which is formed on the lower end of the pedal box upper plate and is guided into the interior of first to third pedal guide grooves to be operated by a pedal supporting plate which is fixed by a bolt, a pedal hinge which is formed, and a base plate which is supported on the bottom surface thereof; a pedal bracket made of aluminum casting fixedly inserted into an inner groove of the middle end portions of the second and third guide grooves of the pedal box; and a fixing bolt having an adjusting fixing nut which is inserted into the bottom surface of the outside thereof and inserted into the base plate.
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