Key actuation systems for keyboard instruments

Details Key actuation systems for keyboard instruments Key actuation systems for keyboard instruments

2006-03-28

2006-03-28

Donels, Jeffrey W (Department: 2837)

Music

Instruments

Automatic

Reexamination Certificate

active

07019201

ABSTRACT:
A key actuation system that is designed for use with a keyboard instrument of the type having multiple keys. Each key is pivotally supported and has a front end that is depressed by a player to play a note. The actuation system includes multiple actuators that are operable to move at least some of the keys. The actuators together include a block of ferromagnetic material with a surface with multiple bores defined in the surface. Each of the bores has a diameter. A winding is positioned in each of the bores. Each of the windings has a hole. A piston is provided at least partially in each of the holes, with each piston being in mechanical communication with one of the keys such that movement of the piston causes movement of the key. Each piston has a width. A ferromagnetic flux plate with multiple openings is positioned on the surface of the block of ferromagnetic material with the openings aligned with the bores. The openings each have a width that is less than the diameter of the bores, such that the flux plate partially closes off the upper end of each bore. When the windings are energized, the corresponding piston moves, thereby moving one of the keys.

REFERENCES:
patent: 4873905 (1989-10-01), Murakami et al.
patent: 5081893 (1992-01-01), Broadmoore
patent: 5107739 (1992-04-01), Muramatsu et al.

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