Keyboard apparatus with white keys and black keys having substan

Details Keyboard apparatus with white keys and black keys having substan Keyboard apparatus with white keys and black keys having substan

1996-05-16

1999-08-03

Shoop, Jr., William M.

Music

Instruments

General features

84434, 84435, G10C 312

Patent

active

059328258

ABSTRACT:
A keyboard apparatus has a support member and a plurality of white keys and black keys. Each of the white keys and the black keys has a fulcrum section and a driving section, and are pivotally mounted about the fulcrum section with respect to the support member. A mass body assembly, that is an action member, has a moving fulcrum, a driven section on a first side of the moving fulcrum that is driven by each of the driving sections of the white keys and the black keys, and a center of gravity that is located on a second side opposite the driven section with respect to the moving fulcrum. The distance between the driven section and the moving fulcrum of the mass body assembly for the black key is greater than the corresponding distance for the white key. The mass body assembly on the second side is formed from the same members that are commonly used for both the white keys and the black keys.

REFERENCES:
patent: 4901614 (1990-02-01), Kumano et al.
patent: 5243125 (1993-09-01), Yamaguchi
patent: 5574241 (1996-11-01), Kumano et al.

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