Keyboard musical instrument and action unit incorporated...

Details Keyboard musical instrument and action unit incorporated... Keyboard musical instrument and action unit incorporated...

2008-11-21

2010-10-05

Donels, Jeffrey (Department: 2832)

Music

Instruments

Stringed

C084S234000, C084S236000, C084S239000, C084S436000, C084S439000

Reexamination Certificate

active

07807907

ABSTRACT:
A grand piano has action units for driving hammers to rotate toward strings, and each action unit is equipped with a repetition mechanism; the repetition mechanism has an elastic guide plate instead of a repetition lever and a repetition spring; and the elastic guide plate per se is deformed after contact with a drop screw, and returns to the initial position for permitting a pianist to play a music tune through repetition of key when the pianist releases the depressed key, whereby the action unit becomes simpler in structure than the conventional action unit.

REFERENCES:
patent: 269405 (1882-12-01), Gemünder
patent: 939362 (1909-11-01), Wessell et al.
patent: 1411820 (1922-04-01), Waggett
patent: 1586547 (1926-06-01), Eastwood
patent: 1900488 (1933-03-01), Dasenbrook
patent: 2524835 (1950-10-01), Ringholz
patent: 4685371 (1987-08-01), Levinson
patent: 4856402 (1989-08-01), Alexander
patent: 5434349 (1995-07-01), Kawamura
patent: 6515213 (2003-02-01), Muramatsu et al.
patent: 6740801 (2004-05-01), Yoshisue et al.
patent: 7169990 (2007-01-01), Yoshisue
patent: 7678977 (2010-03-01), Yoshisue et al.
patent: 2002/0189422 (2002-12-01), Yoshisue et al.
patent: 2007/0068359 (2007-03-01), Wroblewski
patent: 2009/0173206 (2009-07-01), Inoue
patent: 7-46270 (1995-05-01), None

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