Damper action for upright piano with sostenuto spring tab using tension from the damper spring
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United States of America Patent
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Dec 24, 2013
Grant Date -
Sep 26, 2013
app pub date -
Mar 21, 2012
filing date -
Mar 21, 2012
priority date (Note) -
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Abstract
A damper action for an upright piano that comprises a springed tab on the damper lever that “ratchets” or gives way or folds away in one direction and does not in the other, to provide retention when the spring tab passes by the longitudinal ridge on the sostenuto rod in one direction and non-retention when the spring tab passes by the longitudinal ridge on the sostenuto rod the other direction. The ratchet aspect of the spring tab uses tension from the damper spring and does not require a separate spring to apply tension to yield the ratchet effect.
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