Title: Aerodynamic orificed disc

Abstract: A thin disc, preferably of plastic, having an outer annular area which is upwardly convex and an annular inner area integral with the outer annular area and which slopes downwardly toward the disc axis to terminate in an annular edge which defines a coaxial circular opening. The radius of the opening may vary from a quarter of an inch up to almost one-half of the radius of the complete disc. In one embodiment of the invention, where the central opening is of the larger size, a plurality of dihedral vanes may be provided to extend between an object centrally disposed in the orifice and the inner edge of the disc defining the central opening. Such vanes may either extend radially from the centrally disposed object, or may spiral outwardly therefrom, with their leading edges being thickened and similarly disposed to provide added lift to the disc when it is pitched in a spinning motion.

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Inventors: Katzmark, Peter C. (Los Angeles, CA, US)

Application Number: 645713
Filing Date: 1975-12-31
Publication_date: 1977-08-30
Assignee:
Primary Class(es): 473/589
Other Classes:
US Patent Ref:

D209763	Jan, 1968	Mueller	273/106.
2640296	Jun, 1953	Johnson et al.	46/74.
3082572	Mar, 1963	Kno, Jr.	46/75.
3082977	Mar, 1963	Arlin	46/75.
3312472	Apr, 1967	Kerr	273/106.
3765122	Oct, 1973	English	273/106.

Other Refs:
Primary Examiner: Shapiro, Paul E.
Assistant Examiner:
Attorney: Pavitt, Jr.; William H.