Boomerang

• US 4,479,655 A
• Filed: 12/21/1983
• Issued: 10/30/1984
• Est. Priority Date: 12/21/1983
• Status: Expired due to Term

• Current Assignee: Alan J. Adler
• Original Assignee: Alan J. Adler
• Inventors: Adler, Alan J.
• Primary Examiner(s): Shapiro, Paul E.
• Application Number:
  US06/564,471
• Time in Patent Office: 314 Days
• Field of Search: 273/425, 273/426
• US Class Current: 473/589
• CPC Class Codes: A63B 65/08 Boomerangs ; Throwing apparatus therefor

Abstract

A boomerang of circular configuration. A planar ring having a streamlined cross-section described by a convex upper surface and a straight lower surface defines a central opening and an outer perimeter. Three wings extend radially from the outer perimeter and have a similar cross-section. The wings are twisted relative to the plane of the ring to produce aerodynamic lift. The planiform area of the central opening is about 115 percent of the total planiform area of the wings. The ring and body are constructed with an inner plastic armature, surrounded by a cushion of elastomeric materials softer than the armature.

Claims

1. A boomerang of substantially planar configuration comprising;

a. ring body means comprising a substantially planar ring having a central opening and an outer perimeter, said ring body having a steamlined cross-section described by a substantially convex upper line and a substantially straight lower line,

b. three wings, extending radially outward from said outer perimeter of said ring body means, said wings having a streamlined cross-section described by a substantially convex upper line and a substantially straight lower line, said wings twisted relative to the plane of said ring body such that said wings produce aerodynamic lift when the boomerang is thrown with a spinning motion in air,

c. said boomerang proportioned such that the planform area of said central opening exceeds the total planform area of said wings.

2. A boomerang as recited in claim 1 which is manufactured of a plastic and/or elastomeric material.

3. A boomerang as recited in claim 1 wherein said ring body and said wings are comprised of an inner plastic armature, said armature surrounded on its perimeter by a cushion of elastomeric material which is softer than the plastic material of said inner armature.

4. A boomerang as recited in claim 1 wherein the ratio of the planform area of said central opening to the planform area of said wings is 115 percent.

5. A boomerang of substantially planar configuration comprising;

a. ring body means comprising a substantially planar ring having a central opening with a diameter of 5.4 inches, an outer perimeter with a diameter of 8.1 inches, and an axial thickness of 0.13 inches, said ring having a streamlined cross-section described by a convex upper line and a substantially straight bottom line,

b. three wings, each extending 3.5 inches radially outward from the outer perimeter of said ring body, each wing having;

a chord of 1.9 inches, a thickness of 0.13 inches, a streamlined cross-section described by a convex upper line and a substantially straight lower line, and an angle of twist of substantially 3 degrees relative to the plane of said ring body, the roots of said wings being smoothly blended into the outer perimeter of said ring body.

6. A boomerang as recited in claim 5 wherein said ring body and said wings are comprised of an inner plastic armature, said armature being surrounded, on its outer and inner perimeters, by a cusion of elastomermeric material which is softer than the plastic material of said armature.

7. A boomerang as recited in claim 5 monolythically molded from a single thermoplastic material.