Music – Instruments – Stringed
Reexamination Certificate
1993-01-14
2001-01-16
Spyrou, Cassandra C. (Department: 2112)
Music
Instruments
Stringed
Reexamination Certificate
active
06175066
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed to the tuning of a stringed musical instrument, such as a guitar. Further, it is directed to the use of free-to-vibrate parts in such an instrument for reinforcing and enhancing the vibrating characteristics of the instrument.
Basically, a stringed musical instrument is a hollow wooden box serving as a support for a number of strings secured in tension on an outside surface of the box. When the strings are plucked or bowed, they produce complex vibrations transmitted through the bridge or string supports to the wooden box causing its various surfaces to oscillate and setting in motion the air within, and surrounding the box, causing audible sound. obtaining the desired musical effect can be very difficult. In completely acoustic instruments, as compared to instruments using electronic means for amplification and modifying the tone of the instrument, such as those belonging to the violin family and the folk guitar, the wooden box is constructed to oscillate at a number of determined broad resonances for reinforcing the corresponding range of notes played on the instrument. When the tuning of the instrument is maintained, it will have an apparent increase in volume and sustain and generally will be more pleasing to the ear.
In a stringed musical instrument, such as a guitar, the strings extend unsupported between a first critical point on a neck of the guitar and a second critical point on the guitar body. The first critical point is usually formed by a nut supported in the neck. Generally, the second critical point is formed by a bridge element constituting part of a bridge or a combined bridge and tailpiece assembly. Traditionally, the size of the bridge elements is quite small and functions to clearly define the second critical point and can range from a narrow edge to a rounded surface with a diameter no larger than about {fraction (5/32)}″. The strings are typically secured beyond the nut by tuning keys and beyond the bridge element by the tailpiece or tailpiece portion of a bridge and tailpiece assembly. Fine tuning the strings has long been a problem for guitars.
In fine tuning or changing the pitch of a string, two different operations are carried out. In one operation, the length of the string between the first and second critical points is adjusted, such as between the nut and the bridge element, and this is known as harmonic tuning. The second operation involves increasing or decreasing the tension on a given string for raising or lowering the string pitch. This second operation is generally characterized as pitch tuning. In practice, initially harmonic tuning is carried out and then pitch tuning.
A problem existing in tuning the strings is that the two different tuning operations tend to conflict. In harmonic tuning, the pitch is lowered when the distance between the critical points is increased and, conversely, when the distance is shortened, the pitch is raised. In pitch tuning, when the tension is increased, the pitch is raised and when the tension is decreased, the pitch is lowered. These different operations present difficulties in pitch tuning and maintaining the tuned condition of a stringed musical instrument.
When a fulcrum tremolo is used, there is the tendency when increasing string tension and raising of pitch, also to increase the length of the string, and, conversely, when decreasing string tension and lowering pitch, also to decrease the string length. Accordingly, when using a fulcrum tremolo, these counteracting features are not always balanced.
With the development of the fulcrum tremolo, that is, where the bridge plate is pivoted to provide a tremolo or vibrato effect, the problem of maintaining an effective pivoting action and assuring the return of the bridge plate to an initial position has presented problems. Often, the solution of one problem in pivoting the bridge plate has resulted in the introduction of another problem. As an example, when the bridge plate is pivoted, there is a tendency to upset the harmonic tuning of the strings. Further, the pivot support of the bridge plate, such as disclosed in the Rose U.S. Pat. No. 4,171,661, presented problems in maintaining the proper pivoting action, in returning to the original tuned position, in limiting the range of pivotal movement, and in maintaining the pivot means free from wear. If pivoting of the bridge plate results in wear of the surfaces at which the pivoting action takes place, friction is introduced into the movement of the bridge plate which interferes with its return to the initial position and original tuning.
Combination bridge and tailpiece assemblies have been known for some time. In the Kaufman U.S. Pat. Nos. 1,839,395 and 2,241,911 and in the Beauchamp U.S. Pat. No. 2,152,738, such assemblies were disclosed affording means for varying the tension on the strings and creating a tremolo effect.
In the Proelsdorfer U.S. Pat. No. 2,304,587, string tensioning devices placed on the tailpiece for fine tuning the pitch of the strings of violins, guitars and the like, were disclosed, however, such pitch adjustment is quite limited in range and designed to offer minor adjustment of pitch rather than raising and adjusting from an untensioned condition the strings by the tuners placed on the head of the instrument.
The first fulcrum tremolo combining the bridge and tailpiece was set forth in the Fender U.S. Pat. No. 2,741,146. In this patent, a bevelled ridge portion of the base plate was secured to the instrument body by six screws for permitting limited pivotal movement about the fulcrum and thereby varying the tension on the strings and producing the desired tremolo effect. The strings were supported in the traditional manner on top of the base plate by bridge elements adjustable in height and for string lengths, that is, harmonic tuning. As in known combination bridge and tailpiece assemblies, the strings extend vertically through openings behind the bridge elements and are secured in the tailpiece which in this case also functions to receive the string tensioning biasing springs.
In the Rose U.S. Pat. Nos. 4,171,661 and 4,497,236, two improvements were established. In one improvement, the bevelled ridge portion of the base plate was arranged so that it could be received and held in a tapered slot between the head of the screw and a flanged shoulder, thereby increasing the range of pitch change and improving the return to the initial tuned position and provided for lateral height adjustment of the tremolo. The other improvement involved functionally and physically integrating the bridge elements with the known art of combining fine tuners with anchoring means. In effecting the fine tuning, the bridge elements were provided with a constant radius, so that harmonic tuning would not be effected when establishing fine tuning, however, fine tuning is limited to a range of about two musical pitches and is inadequate for bringing the strings to proper pitch for compensating string stretch, or achieving common alternate tuning commonly requiring a larger range of pitch change.
In the Shiboya U.S. Pat. No. 4,383,466, a pin was located in a hinge pivot to improve the return to the initial tuned position. This arrangement did not offer lateral height adjustment of the base plate and the field of rotation was not as great as in the Rose improvement.
With these various improvements, a number of problems remained in the known fulcrum tremolo related to the bridge element and its movement when the tremolo is pivoted. Since the second critical point is offset from the pivot axis, initially there is a tendency for the string height at the bridge to decrease when the base plate is pivoted toward the body with the strings contacting the finger board and causing an undesirable buzzing noise and/or deadening the sound of the strings. This phenomenon limits upward pitch change. In addition, there is a tendency for string length to increase when the pitch is raised and for the string length to decrease with the pitch is lowered acting coun
Dann Dorfman Herrell and Skillman
Eland Stephen H.
Spyrou Cassandra C.
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