Keyboard apparatus

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8779256
APP PUB NO 20110232454A1
SERIAL NO

13041875

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A keyboard apparatus capable of enhancing the return capability of hammer assemblies upon key release to improve the capability of repeated key striking and capable of reducing a height size of action units to make the keyboard apparatus compact. The keyboard apparatus includes hammer assemblies each having a butt disposed pivotable about a hammer pivot shaft and a hammer shank extending from the butt. In a non-key-depression state, the hammer shank obliquely extends downward. As viewed from side, a straight line passing though a gravity center position of the hammer assembly and the hammer pivot shaft forms an acute angle less than 45 degrees relative to a horizontal plane in the entirety of a key depression and key release stroke.

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Patent Owner(s)

Patent OwnerAddress
YAMAHA CORPORATIONHAMAMATSU

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Muramatsu, Shigeru Mori-machi, JP 134 1565
Takeyama, Hisashi Hamamatsu, JP 8 27

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