Professional upright piano action
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United States of America Patent
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Jan 20, 2015
Grant Date -
Oct 23, 2014
app pub date -
Apr 20, 2013
filing date -
Apr 20, 2012
priority date (Note) -
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Abstract
A vertical or upright piano action includes a key bed, a key frame, a wippen, a damper action, a hammer action, a repetition lever, a sustain mechanism, sostenuto mechanism, and an una chorda or action shift mechanism. Butt directly engages damper, improving response to professional standard. Touch resistance is unchanged by sustain mechanism.
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