Friction at the jack and knuckle interface in a grand piano...

Details Friction at the jack and knuckle interface in a grand piano... Friction at the jack and knuckle interface in a grand piano...

2006-10-31

2006-10-31

Donovan, Lincoln (Department: 2837)

Music

Instruments

Stringed

C084S433000

Reexamination Certificate

active

07129403

ABSTRACT:
A grand piano action the jack having a projection acting against the knuckle dependent from the hammer shank carrying the piano hammer by a counter weight carried by the jack eliminating the spoon and the regulating button and the jack spring pressing against the jack causing the traditional excessive friction at the jack and knuckle interface.Friction is totally eliminated from the conventional grand piano action by the capstan screw on the piano key lifting the wippen lever near the pivot of the jack.Patents relating to the problem of excessive friction. Finholm U.S. Pat. No. 4,774,868. Steinway U.S. Pat. No. 5,511,454-U.S. Pat. No. 5,911,167. Baldwin U.S. Pat. No. 6,232,537.

REFERENCES:
patent: 269405 (1882-12-01), Gemunder
patent: 5911167 (1999-06-01), Jones et al.

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