| 摘要 |
A system for tuning a piano or a similar instrument comprises a metal assembly (44) or unit (50), preferably cast iron, composite, zinc or alloy material containing lubricating elements, and tuning pins (10). The pin (10) may have a recessed portion (14) surrounded by a sleeve (30) preferably of bronze or brass to assist and protect the pin when being tuned. The pin (10) has a radial head (12) which seats into a complementary radial bore (31) within aperture (26) which allows the pin (10) to rotate about and swivel across its axis (24). The pin (10) and sleeve (30) are held in the assembly (44) or unit (50) under compression from lockscrew (34) bearing down upon the flat head (32) of the pin with the pin pivoting on curved end (38) of the lockscrew (34). The tuning end is free to move within the aperture clearance (33). The tuning system can be provided either as an individual self contained pin (10), sleeve (30) and lockscrew (34) in an assembly (44), or one or more blocks or sectioned units (50) of said pins, which are mounted to the piano frame preferably from the rear by means of one or more screw threaded lugs (27).
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