HAMMER BUTT FOR UPRIGHT PIANO ACTION WITH HALF-CONICAL HAMMER SHANK HOLE
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United States of America Patent
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Issued Date -
Jul 25, 2013
app pub date -
Jan 19, 2012
filing date -
Jan 19, 2012
priority date (Note) -
Abandoned
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Abstract
A hammer butt for an upright piano with a half-conical hammer shank hole located on the top of said hammer butt which has a cylindrical-shaped cross section as viewed from the side of said hammer butt flange and a trapezoidal-shaped cross section as viewed from the front of said hammer butt, with the bottom of said half-conical hammer shank hole representing the short side of said trapezoidal-shaped front cross section.
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