Two-speed tuning machine for musical instruments

Details Two-speed tuning machine for musical instruments Two-speed tuning machine for musical instruments

1980-05-16

1982-05-18

Franklin, Lawrence R.

Music

Instruments

Stringed

G10D 314

Patent

active

043299040

ABSTRACT:
A two-speed tuning machine for mounting on a hand-held, stringed, musical instrument has a first, relatively fast, gearing for rotating a post upon which a string is reeled during initial tensioning to a rough approximation of the desired final pitch, and a second, relatively slow, gearing, with its own separate input shaft, for rotating the same post during the final, precision tensioning to final pitch. A planetary-gear train having a relatively low gear-reduction ratio is used during the initial tensioning by applying manual rotation to an input shaft attached to the sun gear of the planetary-gear train, the planet gears being gang-coupled to rotate the post. The ring gear of the planetary-gear train is restrained during the initial tensioning by means of a worm engaging a worm ring on the periphery of the ring gear. The worm is rotated by manual rotation applied to the second separate input shaft to cause the entire planetary-gear train to rotate at a relatively high gear-reduction ratio during the final, precision tensioning.

REFERENCES:
patent: 155352 (1874-09-01), White
patent: 1561566 (1925-11-01), Purdy
patent: 4151778 (1979-05-01), Beattie et al.
patent: 4191086 (1980-03-01), Spercel

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