| 摘要 |
A stringed musical instrument that is convertible between fretted and fretless playing configurations includes a body, a neck connected to the body at one of its ends, a fingerboard disposed on the neck, a plurality of movable frets spaced apart at positions along the fingerboard, a plurality of strings disposed above the frets, and, according to one aspect of the invention, at least one rod that extends through the frets, wherein the at least one rod is configured to function both as a spring and as a device for retaining the frets in the fingerboard. According to another aspect of the invention, at least one strip of material separates a metallic component of a fret adjustment device from another component of the instrument that is formed from metal, wherein the at least one strip of material is configured to provide permanent dry lubrication for the metallic component of the fret adjustment device. According to still another aspect of the invention, the fret adjustment device includes a plate member disposed in the body of the instrument and at least one cam rod extending beneath the plurality of frets, the plate member having at least one aperture disposed therein, wherein the at least one aperture of the plate member forms a passive connection with one end of the at least one cam rod.
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