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US 6,686,521 B2Granted
Keyboard instrument
AssigneesYamaha Corporation, Kemble & Co.
InventorPaul Sandifer
Life of this patent
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AssigneesYamaha Corporation, Kemble & Co.
InventorPaul Sandifer
Estimating the term…
A keyboard instrument such as an upright piano is basically constructed by a keyboard, an action, a case assembly, a fall assembly, a back hollow assembly and a top door assembly. Herein, the fall assembly provides a fall cover for covering the keyboard, and the top door assembly having an opening top door is linked to the fall assembly by way of the back hollow assembly. The top door pivotally moves in response to movement of the fall cover of the fall assembly being closed or opened, wherein when the fall cover is opened, the top door opens to produce a small gap in proximity to a lower end of the top door. The small gap allows piano sound to be partially released from a casing to increase loudness of the piano sound and to enhance clarity in tone color of the piano sound. The keyboard instrument further provides a damping mechanism for imparting resistance load to the fall cover being closed or opened. That is, the damping mechanism uses a rotation damper containing viscous fluid that moves in response to pivotal movement of the fall cover to produce torque by which an increasing load is to be automatically imparted to the fall cover being closed.
A keyboard instrument comprising:
A keyboard instrument comprising:
A keyboard instrument comprising:
An upright piano comprising:
Dependencies are inferred from the claim text.