Music – Instruments – General features
Patent
1997-03-12
1998-10-20
Shoop, Jr., William M.
Music
Instruments
General features
84440, 84745, G10C 312
Patent
active
058249281
ABSTRACT:
A keyboard apparatus for a musical instrument which includes a laterally elongated frame structure made of synthetic resin, a plurality of keys arranged in parallel on the frame structure and pivoted at their proximal ends on a rear end portion of the frame structure to be depressed at their front portions, and a laterally elongated printed circuit board mounted on the frame structure and provided thereon with a plurality of detection switches which are arranged to detect depression of the keys. In the keyboard apparatus, the frame structure is composed of a plurality of laterally spaced vertical reinforcement ribs placed in a fore-and-aft direction of the frame structure, an upper support plate integrally formed with the vertical reinforcement ribs at their upper end surfaces and extended in a lateral direction of the frame structure to be placed under the keys, a key mounting portion integrally formed on a rear end of the upper support plate to support the keys pivoted thereon, and a bottom plate integrally formed with the vertical reinforcement ribs at their front bottom surfaces to support the printed circuit board mounted thereon.
REFERENCES:
patent: 4885969 (1989-12-01), Chesters
patent: 4901614 (1990-02-01), Kumano et al.
Kumano Shinji
Sato Tsuyoshi
Hsieh Shih-yung
Shoop Jr. William M.
Yamaha Corporation
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