Music – Instruments – Stringed
Patent
1982-09-30
1985-04-02
Franklin, Lawrence R.
Music
Instruments
Stringed
G10D 300
Patent
active
045080038
ABSTRACT:
A truss rod apparatus, for use within the neck of a stringed musical instrument, to correct both concave and convex warping of the instrument's neck. The apparatus includes a first and second rod, the rods lying parallel to each other in a groove within the instrument's neck. The groove and truss rod apparatus are overlaid by a fingerboard. The rods are fastened together at one pair of their ends. The opposite end of the first rod is fastened to an anchor block, holding the rod axially and radially immobile. The opposite end of the second rod is threaded, engaging with internal threads of a hollow bolt. The hollow bolt itself threads with a passageway through the anchor block. Upon rotation of the bolt, the effective length of the second rod may be increased or decreased without rotating the rod, causing either a concave or convex bow in the rod pair. Where the first and second rod lengths are equal, the rods lay straight, imparting no forces on the instrument neck. The apparatus is easily replaceable without dismantling of the instrument's neck.
REFERENCES:
patent: 2460943 (1949-02-01), Nelson
patent: 3143028 (1964-08-01), Fender
patent: 3416399 (1968-12-01), Baldoni
patent: 4308780 (1982-01-01), Boucher
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