Grand piano actions

Details Grand piano actions Grand piano actions

1989-01-06

1989-08-15

Hix, L. T.

Music

Instruments

Stringed

G10C 318

Patent

active

048564028

ABSTRACT:
An improvement for grand piano actions reduces unwanted friction between the repetition lever and the hammer shank. The conventional grand piano knuckle is replaced by a lever disposed generally parallel to the repetition lever and pivotally secured thereto at one end. An adjustable spring provides a force biasing the lever away from the repetition lever. A travel limit adjusts the maximum pivotal excursion of the lever relative to the repetition lever. At the opposite end of the lever, a centrally pivoted platform structure is pivotally secured. The structure includes a surface which engages the hammer shank and at least one brake surface which engages the repetition lever.

REFERENCES:
patent: 106396 (1870-08-01), Oliver
patent: 269405 (1882-12-01), Gemunder
patent: 424202 (1850-03-01), Herrburger
patent: 520989 (1894-06-01), Herrburger
patent: 902439 (1908-10-01), Nickel
patent: 1206509 (1916-11-01), Brown
patent: 1215489 (1917-02-01), Conover
patent: 2195721 (1940-04-01), Davidson
patent: 2442182 (1948-05-01), Socin
patent: 2620700 (1952-12-01), Shill

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