Title: Keybord musical instrument and method for securing balancers to keys
Application Number: 200510055135 Application Date: 2005.03.17
Publication Number: 1670812 Publication Date: 2005.09.21
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G10C3/12
Applicant(s) Name: Yamaha Corp. Address:
Inventor(s) Name: Izutani Hitoshi, Yamashita Noboru
Attorney & Agent: ge jing li xiaoshu
Abstract:
     Keys (4, 10) of an acoustic piano require balancers (12) for cancellation of a part of self weight of the action units/ hammers (5/ 6); however, the balancers (12) are liable to be dropped off due to the aged deterioration of the wooden bars (11); in order to keep the balancers (12) stable in the keys (4, 10) against the aged deterioration, the balancer (12c) is plastically deformed so as to bite into the wooden bar (11), the balancer (12A), which is formed with thorns (15A), is rotated so as to make the thorns (15A) bite into the wooden bar (11), the balancer (12C) is shaped into a configuration different from the holes (11a, 11b) so as to exert resilient force on the inner surface in a direction in parallel to the grain of wood (11G), or the balancer (13D) is inserted into a constricted hole (11a') so as to strongly exert the resilient force on the inner surface, thereby being prevented from the dropping off from the keys.
Time: 7
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