Electricity: circuit makers and breakers – Electric switch details – Actuators
Reexamination Certificate
2007-06-07
2008-09-23
Friedhofer, Michael A (Department: 2832)
Electricity: circuit makers and breakers
Electric switch details
Actuators
C200S0050EA
Reexamination Certificate
active
07427723
ABSTRACT:
A keyboard apparatus constructed to be capable of reducing the depth size thereof and permitting a key unit to be mounted to a key frame with a simple operation. Hinges are extended downward from rear ends of black key main bodies of a black key unit in the vertical direction, and are connected at their lower ends to a common-to-black-keys base end. The black key main bodies are pivotable via the hinges relative to the common-to-black-keys base end in the key depression/release direction. Similarly, white key main bodies of first and second white key units are pivotable via hinges relative to a common base end in the vertical direction. The key frame is formed at its rear portion with a recessed groove over the entire width of all keys and formed with elastic members extending in the front-to-rear direction on the front and rear sides of the recessed groove. Using elastic deformations of the elastic members, a common-to-all-keys base end of the key unit is fitted and fixed to the recessed groove.
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Friedhofer Michael A
Morrison & Foerster / LLP
Yamaha Corporation
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