Title: Tuning device

Abstract: The present invention provides a new and improved device for adjusting and maintaining the tension in a string of a musical instrument. The string may be tuned to a first pitch by turning a first knob. This actuates a string post through a series of reduction gears to achieve extremely precise tuning of the first pitch. Then the string may be tuned to a second pitch using a second knob. When adjustable stops have been locked in place, the instrument's tuning may be conveniently and repeatably changed from the first pitch to the second pitch and back again. The reduction gearing provides a smaller change in string tension when the first input knob is turned a given amount than when the second knob is turned the same amount. The device is housed in an aluminum housing which is formed from extruded metal bar stock. A pin projects from the housing to secure the device against rotation with respect to the instrument.

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Inventors: Spercel, Robert J. (Cleveland, OH, US)

Application Number: 867164
Filing Date: 1978-01-05
Publication_date: 1980-03-04
Assignee:
Primary Class(es): 84/306 84/312R, 984/119, 984/DIG1
Other Classes:
US Patent Ref:

155352	Sep, 1874	White	84/306.
361500	Apr, 1887	Gardner	84/306.
2453572	Nov, 1948	Ferrier	84/304.
2644360	Jul, 1953	Smith	84/312.
2771808	Nov, 1956	Jenkins	84/304.
3000253	Sep, 1961	Houde	84/312.
3674909	Jul, 1972	Peters et al.	84/312.
3726172	Apr, 1973	Sorkin	84/304.
3830132	Aug, 1974	Lowe	84/304.

Other Refs: 240535

Oct, 1925	GB.

Primary Examiner: Franklin, Lawrence R.
Assistant Examiner:
Attorney: