Damper unit for a piano

Details Damper unit for a piano Damper unit for a piano

1995-03-17

1996-06-25

Spyrou, Cassandra C.

Music

Instruments

Stringed

84220, 84171, G10C 300, G10D 1500

Patent

active

055289690

ABSTRACT:
A damper unit for a piano is provided in which the position of a hammer stop rail for contacting the hammer shanks before the hammers strike the strings can be changed from an inoperative retracted position to a stop position with a relatively small drive force and the hammer stop rail is firmly and reliably positioned at the stop position. Stop rail support arms for supporting the hammer stop rail are connected, via linkage mechanisms composed of links and lever arms, to a rotary shaft. By pulling a wire that is connected to the rotary shaft, the rotary shaft is rotated, such that the hammer stop rail can be positioned, via the linkages, at the stop position and the retracted position, in which the hammer stop rail does not contact the hammer shanks. As compared with the conventional damper unit, the position of the hammer stop rail can be changed with a relatively small drive force. Moreover, the hammer stop rail is thus fixedly positioned at the stop position, thereby reliably dampening the hammer striking sound. The linkage mechanisms may be replaced with a cam mechanism that contacts the stop rail support arms for changing the position of the hammer stop rail.

REFERENCES:
patent: 511747 (1894-01-01), Bettendorf
patent: 686251 (1901-12-01), Bosenbury
patent: 5374775 (1994-12-01), Kawamura et al.

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