Method of improving repetitive striking performance, jack and action mechanism of piano
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United States of America Patent
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Oct 24, 2006
Grant Date -
Feb 10, 2005
app pub date -
Jul 28, 2004
filing date -
Aug 4, 2003
priority date (Note) -
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Abstract
A jack used in an action mechanism of a piano has substantially an L-shape, composed of a big jack portion and a small jack portion. The thickness of the small jack portion is made smaller than that of the big jack portion in a direction of key arrangement in a state of the jack being fitted in the piano. By reducing the weight of the small jack portion as above, the time required for the jack to return to a position capable of pushing up a part of a striking member can be shortened. Accordingly, more frequent repetitive striking is allowed within a predetermined period.
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