Music – Accessories – Teaching devices
Patent
1981-05-04
1984-03-06
Franklin, Lawrence R.
Music
Accessories
Teaching devices
283 47, G10G 104
Patent
active
044346980
ABSTRACT:
A system for devising a sheet of music and for transposing the music from one key to another. A layer of opaque material having standard music indicia disposed thereon is interposed typically between a first and second overlay of transparent material which includes additional musical indicia. Additional indicia disposed on the overlays transparent is in the form of opaque areas which match the color of the opaque material. Cooperating indicia in the opaque layer and transparent overlays permit alignment of the two for a desired key. The aligning indicia are disposed in predetermined relationship to the staff lines and other music notations such that when the opaque layer is adjusted relative to the transparent overlay, any one of the 13 possible keys can be selected. The dimensional relationships among the various music notations and staff lines, for one embodiment, reflect the difference in relative motion between the opaque layer and each of the transparent overlays. A chord guide simultaneously aligned with the key selection is provided employing the Roman numeral designation approach to representing music chords, but which also provides a way by which the musician can transpose from the Roman numeral system to the, perhaps, more familiar letter designating system. Three different embodiments employing cooperating aligning indicia and apparatus are disclosed. Further, a cooperating cam-cutout arrangement is described wherein a positive locking between the opaque layer and the transparent overlays is effected, once the desired key is selected.
REFERENCES:
patent: 659113 (1900-10-01), Turner
patent: 1436771 (1922-11-01), Meling
patent: 2271772 (1942-02-01), Maffei
patent: 3736833 (1973-06-01), Alvarado
Franklin Lawrence R.
Mishkin Ronald H.
Pappas James T.
Quast W. Patrick
Quast W. Patrick
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