Guitar with controlled neck flex

Details Guitar with controlled neck flex Guitar with controlled neck flex

1996-12-06

2000-04-18

Shoop, Jr., William M.

Music

Instruments

Stringed

84267, 84291, G10D 300

Patent

active

060517654

ABSTRACT:
A guitar neck is formed with a protruding trapezoidal heel which extends into a pocket formed at the neck end of the body. The tendency of the strings to bend the neck is counteracted by a truss rod assembly which is positioned in a contoured channel formed in the neck beneath the fingerboard. The assembly has a threaded stainless steel rod which extends through an aluminum U-channel, with one end extending beyond the U-channel beneath and adjacent the first fret of the fingerboard, where it is fixed to the U-channel, and the other end extending out of the U-channel adjacent the neck-body joint, where an adjustable hex nut is threaded on the rod which bears on a washer. Two cylindrical spacers are fixed to the rod within the U-channel at positions upward of the neck joint which serve to hold the rod in the center of the U-channel between the U-channel legs, and also spaced outwardly from the base of the U-channel to thereby cause the rod to bow away from the base into the contoured channel in the neck. Tightening the hex nut causes the rod to straighten out, thus forcing the U-channel to flex into a curve which counteracts the bending of the neck applied by the string tension.

REFERENCES:
patent: 2148589 (1939-02-01), Stathopoulo
patent: 2510775 (1950-06-01), Forcillo
patent: 3159072 (1964-12-01), Burns et al.
patent: 3438297 (1969-04-01), Ogletree
patent: 3769871 (1973-11-01), Cawthorn
patent: 3901119 (1975-08-01), Siminoff
patent: 4074606 (1978-02-01), Fender
patent: 4203342 (1980-05-01), Montgomery et al.
patent: 4290336 (1981-09-01), Peavey
patent: 4722260 (1988-02-01), Pigozzi
patent: 4930389 (1990-06-01), Kunstadt
patent: 4953435 (1990-09-01), Chapman
patent: 5249498 (1993-10-01), Wilfer et al.
patent: 5465642 (1995-11-01), Goto
"Truss Rods," Stewart-McDonald Catalog page, Stewart-Macdonald Manufacturing Company, Inc., Athens, Ohio (1996).
Exhibit A is a top view photograph of a Martin truss rod assembly having a rod within a channel member.
Exhibit B is a top view photograph of a Martin truss rod assembly with the rod separated from the channel member.

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