Flexible unitary circular air foil

Details Flexible unitary circular air foil Flexible unitary circular air foil

1986-12-11

1988-04-12

Hafer, Robert A.

Amusement devices: toys

Aerodynamically supported or retarded

Spinning disc

273424, A63B 6510

Patent

active

047371285

ABSTRACT:
A flexible, circular, elastomer air foil that is a unitary structure has a central portion that droops downward when the foil is resting on a horizontal flat surface surrounded by an annular portion that is then convex on top and concave on the bottom when resting on a thicker perimetrical rim portion.

REFERENCES:
patent: 3099450 (1963-07-01), Randall
patent: 3359678 (1967-12-01), Headrick
patent: 3710505 (1973-01-01), Linenfelser
patent: 3724122 (1973-04-01), Gillespie, Jr.
patent: 4023805 (1977-05-01), Sherrill
patent: 4135325 (1979-01-01), Lehman
patent: 4157631 (1979-06-01), Kifferstein et al.
patent: 4173834 (1979-11-01), Kovac
patent: 4176843 (1979-12-01), Dewitt, Jr.
patent: 4223473 (1980-09-01), Brown
patent: 4241533 (1980-12-01), Newsome
patent: 4351129 (1982-09-01), Kerkenbush et al.

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