Music – Instruments – Stringed
Patent
1997-10-01
1999-12-21
Donels, Jeffrey
Music
Instruments
Stringed
G10D 300
Patent
active
060051744
ABSTRACT:
A capo may be used on a guitar or banjo to reduce the operating length of all strings temporarily. The strings of a slide guitar (e.g. Dobro) are suspended approximately 1 cm above its fretboard and so cannot be clamped against a fret by a padded bar as with a Spanish guitar or banjo. In a typical embodiment, the slide-guitar capo is an essentially prismatic bar approximately 7-8 cm long, and made of metal or plastic. The three side faces of the prismatic bar are approximately 15.2, 13.7 and 12 mm wide; so that it has three ridge heights, approximately 10.2, 11.4 and 13 mm (were its edges not rounded) depending on which face is selected as base. A rectangular groove, 3.5 mm wide and 1.2 mm deep, runs the length of each side face of the bar, positioned below the bar's ridge when that face is the base. The side edges of the bar are rounded down approximately 0.2 mm. The end edges and corners are rounded down further, enough so that the bar slips easily between the guitar's fretboard and strings with a groove over a fret, the bar's ridge height being selected (approximately 10.0, 11.2 or 12.8 mm) to force the strings up enough to avoid buzzing of the strings when plucked with normal force. The groove's width exceeds a fret's width and is positioned such that the bar may be slipped toward the nut enough to achieve satisfactory tuning despite the additional string tension.
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patent: 4250790 (1981-02-01), Shubb
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patent: 4563934 (1986-01-01), Keizer
patent: 4621558 (1986-11-01), Cornette
patent: 4671156 (1987-06-01), Hathcock
patent: 5284077 (1994-02-01), Ellis
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