MOVABLE PART FIRMLY EQUIPPED WITH BALANCE WEIGHT, MUSICAL INSTRUMENT AND METHOD OF ASSEMBLING BALANCE WEIGHT THEREIN
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United States of America Patent
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app pub date -
Jul 6, 2011
filing date -
Mar 15, 2005
priority date (Note) -
Abandoned
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Abstract
Keys of a piano are depressed against the total weight of associated action units and hammers so that balance weight pieces are embedded in the front portion of each key; since the wood bar of the key is expandable and shrinkable due to the conditions of the environment, the weight pieces are liable to come loose; the balance weight piece is formed with ridges and valleys repeated at least 7 times at fine pitches equal to or less than 2 millimeters, and the maximum diameter of the ridges is slightly longer than an inner diameter of a hole formed in the wood bar; while the balance weight piece is being pressed into the hole, the ridges make the inner surface portion elastically deformed; when the balance weight piece reaches the target position, the inner surface portion penetrates into the valleys so that the balance weight piece is lodged therein.
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