| 摘要 |
<p>A lever mechanism for manually fretting the strings of a harp from a flat to either a natural or a sharp note. A pair of fret blocks are fastened to the neck of the harp for longitudinal adjustment relative to each harp string. Each block includes a fret bar extending transversely of the string, beneath it, and having a generally Vee-shaped fret formed therein. A lever is mounted on the block over the string and in position to have a cam surface brought to bear, upon manual pivoting of the lever, against the string to force it into seated relationship in the fret. The cam surface has a decreasing radius of curvature as it contacts the strings so that initial travel of the lever results in relatively little displacement of the string whereby the final travel of the lever results in a substantial displacement of the string into engagement with the fret.</p> |
