Method of adjusting length of duplex scale portion of piano stri

Details Method of adjusting length of duplex scale portion of piano stri Method of adjusting length of duplex scale portion of piano stri

1996-06-19

1998-04-07

Spyrou, Cassandra C.

Music

Instruments

Stringed

84458, 84206, 84209, G10C 310

Patent

active

057366608

ABSTRACT:
The invention relates to an acoustic piano having a fretbase on which at least one fret node is supported by a fret and an adjacent node spaced from the fret node. Selected piano strings press downwardly upon the nodes and define between the nodes a duplex scale portion of the piano strings. A plate is located beneath the fretbase and is pressed downwardly by the fretbase due to pressure of the strings. The invention provides a method of moving the fretbase portion relative to the plate in a direction parallel to the piano strings. The method includes the steps of providing a force-applying tool including a mandrel portion, and a force-transmitting head having a force-transmitting surface and a surface for sliding on the plate. The tool is oriented so that a main axis of the mandrel portion angles downwardly towards a plane of the piano strings, with the force-transmitting surface abutting a force-receiving surface of the fretbase, and with the sliding surface abutting the plate. An impulse force is applied along the main axis having a downward component orthogonal to the plane and a component horizontal to the plane. A sufficient amount of the downward component of force is directed into the plate through the sliding surface so as to substantially reduce impulse force-caused friction between the fretbase and the plate.

REFERENCES:
patent: 126848 (1872-05-01), Steinway
patent: 1212304 (1917-01-01), Woods
Franklin, "A Tuner's 10-Year Tonal Treasure Hunt," Piano Technician's Journal, May 1995, vol. 38, No. 5, pp. 24-29.
Franklin, "The Duplex Difference, Part 2," Piano Technician's Journal, Sep. 1995, vol. 38, No. 2, pp. 36-41.

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