Apparatus for opening and closing top board of grand piano
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 22, 2002
Grant Date -
N/A
app pub date -
Oct 23, 2000
filing date -
Oct 28, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an apparatus for opening an closing a top board of a grand piano, the top board is hingedly supported along one side thereof on an outer rim of the grand piano. The apparatus has a gear-type of jack made up of a jack main body fixed to a wooden fame of the grand piano, and a rod which is movable in a longitudinal direction through the jack main body and which supports the top board in a manner to open and close said top board.
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