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Fret system in stringed musical instruments
| Details |
Inventors: Chapman, Emmett H.;
Assignee:
Primary Examiner: Hsieh; Shih-Yung
Assistant Examiner:
Attorney, Agent or Firm: McTaggart; J. E.
In a novel fret system for stringed musical instruments, the fret bar can be fabricated from standard square metal stock, typically of stainless steel. Each fret bar is retained in a corresponding transverse channel machined in the fingerboard surface region of the neck/fingerboard with a conforming cross-sectional shape that locates the main portion of the fret bar recessed into the neck/fingerboard with one corner portion extending through the channel opening in the fingerboard surface, thus forming a fret tip of desired height at the apex of a 90 degree angle. The fret bar is inserted endwise into its channel in the neck/fingerboard where it is retained securely. This system has proven beneficial both for the "feel" of playing the instrument in tapping and conventional modes and for precision and uniformity in manufacture. In a preferred embodiment, material is machined from the bottom corner opposite the fret tip, providing a flat bottom surface that enhances support and stability and that can be configured with recessed regions for retaining adhesive applied at assembly, to prevent longitudinal shifting of the fret bars. |
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DETAILED DESCRIPTION The above mentioned objects have been satisfied in the present invention of a novel fret configuration that utilizes standard square metal stock, preferably of stainless steel, typically 3/16 inch square, oriented such that the two cross-sectional diagonals are respectively substantially parallel and perpendicular to the fingerboard surface, thus making the fret tip the apex of a 90 degree angle.
Compared to lesser or greater angles, the 90 degree angle at the top corner of the square fret of the present invention has been found to be beneficial both for the "feel" of playing the instrument and for ease of manufacture, and can be retained reliably in channels machined in the neck/fingerboard with a shape that fits the fret closely and provides optimal fret exposure, locating the horizontally diagonal corners beneath the fingerboard surface, positively constrained against upward shifting, by 45 degree inclined channel sidewalls.
The frets, when assembled in place, are readily dressed preferably with a belt sander or file, to accurately level off the fret tips to an even plane for uniform close relationship with the strings.
This leaves a flat surface on each fret tip of varying width, but, due to the 90 degree angle, these widths are close to uniform and always narrow enough, typically in the range of a few thousandths of an inch, that pitch is not compromised.
Each fret is then further dressed individually to smoothly round the corners at the edges of the flat surface and thus further improves the playing feel, particularly on those stringed instruments that are intended for the two-handed tapping technique, such as the Chapman Stick product line.
Such dressing can often be done in the final polishing process with a hand-held rotary sander.
The nominal 90 degree angle of the square-shaped fret rods has been found to facilitate these manufacturing operations in comparison to the rounded contour presented by frets of known art with convex shapes including conventional (FIG
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