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