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US 4,337,950 AGranted
Circular boomerang
OwnerKenneth N. Gidgeinventor
Life of this patent
Estimating the term…
Abstract
A toy boomerang is provided in the form of a generally flat circular body having a plurality of spiral arms extending between a central hub and an outer annulus. Each spiral arm defines an airfoil providing lift to the toy when it is spun through the air. The toy is used by spinning it into the air by a swinging, snapping movement of the arm and wrist whereupon the toy will follow a rising straight trajectory to a stall point and then reverse its direction and return directly back to the thrower.
Claims9
A boomerang-action toy, comprising
- (a) a central hub,
- (b) an integral narrow outer annular rim spaced from and coplanar with said hub and coaxial therewith, said rim being of substantially uniform dimensions throughout,
- (c) a plurality of matching integral angularly spaced arms each defining an airfoil in cross-section and extending spirally between said hub and said rim and coplanar therewith, the outer terminus of said arms being proximate to the outer periphery of said rim and each of said arms originating from said hub,
- (d) the length of each of said arms generally corresponding in length to the radius of said toy,
- (e) the inner end of each arm extending generally radially from said hub and the outer end of each arm joining said rim at an acute angle to form with said rim an arm width at the outer end of said arm greater than the arm width at the inner end of said arm.
2 more elements
Dependencies are inferred from the claim text.