US 4,305,323 AGranted

Harmonic conversion wheel

OwnerBruce L. Grahaminventor

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Abstract

A Harmonic Conversion Wheel is disclosed comprising a circular disk, a faceplate and attaching means joined together along a common axis which is the centerpoint of said elements. By rotation of the disk about said axis and proper registration of said disk with the windows positioned in the faceplate, an artist, composer, student of music, performer or arranger has at their disposal a multitude of information regarding the law of intervals and similar musical relationships concerning tonics, chords, scales and notes within a scale. Thus, a person without analogous skills can perform, rearrange, transpose or learn music to the best of his ability while developing his own caliber of musical knowledge and expertise.

Claims10

Dependent claims

A harmonic conversion wheel for quickly and reliably providing a multitude of information regarding the interrelationships of music to the user, comprising:

a disc having a center point, a first circle of twelve note symbols printed on said disc about the center point of said disc and being a chromatic scale of music;
a second circle of twelve note symbols printed on said disc about the center point of said disc and being a chromatic scale of music, said second circle being disposed concentrically with respect to said first circle with the note symbols of said first and second circles being arranged in twelve radial columns radiating from the center point of said disc, each note symbol in said second circle being four semitones upscale from the note symbol in the same column in said first circle;
a third circle of twelve note symbols printed on said disc about the center point of said disc and being a chromatic scale of music, said third circle being disposed concentrically with respect to said first and second circles with the note symbols of said third circle being arranged in said twelve radial columns radiating from the center point of said disc, each of said note symbols in said third circle being three semitones upscale from the note symbols in the same column in said second circle;
a face plate rotatably attached to the center point of said disc so that said disc is rotatable with respect to said face plate;
first, second and third apertures formed in said face plate in a row oriented on a radius extending from the center line of said disc and being disposed to selectively reveal one of said radial columns of note symbols of said first, second and third circles, said disc being rotatable so that any one of said twelve radial columns of note symbols may be selectively positioned in said first, second and third apertures, the note symbols being disposed in said first, second and third apertures being the major chord of the note symbol disposed in the first aperture;
and
a fourth aperture formed in said face plate in a position to reveal a note symbol in said second circle in a column adjacent to the column of note symbols disposed in said first, second and third apertures, said fourth aperture being positioned to disclose the note symbol that may be substituted for the note symbol disclosed in said second aperture to compose the minor chord of the note disclosed in said first aperture.

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Dependencies are inferred from the claim text.

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Abstract

A harmonic conversion wheel for quickly and reliably providing a multitude of information regarding the interrelationships of music to the user, comprising:

a disc having a center point, a first circle of twelve note symbols printed on said disc about the center point of said disc and being a chromatic scale of music;
a second circle of twelve note symbols printed on said disc about the center point of said disc and being a chromatic scale of music, said second circle being disposed concentrically with respect to said first circle with the note symbols of said first and second circles being arranged in twelve radial columns radiating from the center point of said disc, each note symbol in said second circle being four semitones upscale from the note symbol in the same column in said first circle;
a third circle of twelve note symbols printed on said disc about the center point of said disc and being a chromatic scale of music, said third circle being disposed concentrically with respect to said first and second circles with the note symbols of said third circle being arranged in said twelve radial columns radiating from the center point of said disc, each of said note symbols in said third circle being three semitones upscale from the note symbols in the same column in said second circle;
a face plate rotatably attached to the center point of said disc so that said disc is rotatable with respect to said face plate;
first, second and third apertures formed in said face plate in a row oriented on a radius extending from the center line of said disc and being disposed to selectively reveal one of said radial columns of note symbols of said first, second and third circles, said disc being rotatable so that any one of said twelve radial columns of note symbols may be selectively positioned in said first, second and third apertures, the note symbols being disposed in said first, second and third apertures being the major chord of the note symbol disposed in the first aperture;
and
a fourth aperture formed in said face plate in a position to reveal a note symbol in said second circle in a column adjacent to the column of note symbols disposed in said first, second and third apertures, said fourth aperture being positioned to disclose the note symbol that may be substituted for the note symbol disclosed in said second aperture to compose the minor chord of the note disclosed in said first aperture.

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