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US 5,490,678 AGranted
Ambidextrous boomerang
OwnerEric Darnellinventor
Life of this patent
Estimating the term…
Abstract
Boomerang throwable by left-handed or right-handed persons to return to the thrower is homogeneous and includes plurality of arms extending radially from a central portion with each of the arms having leading and trailing edges symmetrical about respective radial axes of the arms.
Claims4
A homogeneous, one-piece boomerang for outdoor use, throwable by left or right handed persons to return to the thrower comprising:
- a. a homogeneous solid, imperforate center portion;
- b. two sides, each opposing the other, said sides joining one to the other defining the periphery of said boomerang, said periphery being essentially planar;
- c. three arms radiating symmetrically from said center portion, said arms having symmetric leading and trailing edges about their radial axes, each of said arms being like one another;
- d. said arms having cross sectional areas transverse to their radial axes first decreasing then increasing outwardly along the radial axes of said arms, grater mass being at the extremity than proximate to said center portion, said arms having tips being generally bulbous;
- e. said arms having a raised portion running inwardly along the radial axis of each of said arms towards said center portion, joining at said center portion one raised portion to another, said raised portions all being on a common side;
- f. wherein the side opposite said side which contains said raised portions is concave along the radial axis of each of said arms with said concavity running inwardly towards said center portion where said concavities join one to another to from a concave surface on said center portion on said side opposite said side which contains said raised portions;
- g. wherein the height perpendicular to said planar periphery first decreases then increases along said radial axis allowing rotation and deformation of the arms to occur;
- and
- h. wherein said boomerang is made of thermoplastic;
- i. wherein rotation about the radial axis of each of said arms produces a permanent but redeformable deformation of said arms in the plane of said boomerang;
- j. wherein after said arm rotation about the arm radial axis the plane of each of said arms is skew with respect to the original plane of said boomerang, said permanent but redeformable deformation causing different flight characteristics from those exhibited by said boomerang prior to application of said permanent but redeformable deformation.
8 more elements
A one-piece boomerang throwable by left-handed or right-handed persons to return to the thrower comprising:
- a. a solid, imperforate center portion;
- b. two sides, each opposing the other, said sides joining one to the other defining the periphery of said boomerang, said periphery being essentially planar;
- c. a plurality of arms extending radially from said center portion, each of said arms having leading and trailing edges symmetrical about their respective radial axes;
- d. each of said arms being like another;
- e. each of said arms having a raised portion along the radial axis of said arm;
- f. said raised portions all being on a common side of said boomerang;
- g. said raised portions extending inwardly along their respective arms to said center portion adjoining one with another at said center portion of the boomerang;
- h. said boomerang being constructed of a homogeneous material;
- i. said periphery of said boomerang being essentially planar;
- wherein the side opposite said side which contains said raised portions is concave along the radial axis of each of said arms with said concavity running inwardly towards said center portion where said concavities join one to another to from a concave surface on said center portion on said side opposite said side which contains said raised portions, and said arms are axially apertured on said tips proximate a radial position of maximum radial cross-sectional area of the arms.
7 more elements
A one-piece, homogeneous boomerang suitable for indoor use, throwable by left or right handed persons to return to the thrower comprising:
- a. a solid, imperforate center portion;
- b. two sides, each opposing the other, said sides joining one to the other defining the periphery of said boomerang, said periphery being essentially planar;
- c. three arms radiating symmetrically from said center portion, said arms having symmetric leading and trailing edges about their radial axes, each arm being like another;
- d. said arms having cross-section al areas transverse to their radial axes first decreasing then increasing outwardly along the radial axes of said arms, greater mass being at the extremity than proximate said center portion, said arms having tips being generally bulbous;
- e. said arms each having a raised portion running inwardly along the radial axis of each of said arms towards said center portion, joining at said center portion one raised portion to another, said raised portions being all on a common side;
- f. said side opposite said side containing said raised portions being essentially planar;
- g. the height perpendicular to said planar periphery decreasing outwardly along the axis of said arms;
- h. said boomerang being made of polyethylene foam;
- wherein the side opposite said side which contains said raised portions is concave along the radial axis of each of said arms with said concavity running inwardly towards said center portion where said concavities join one to another to from a concave surface on said center portion on said side opposite said side which contains said raised portions, and said arms are axially apertured on said tips proximate a radial position of maximum radial cross-sectional area of the arms.
6 more elements
Dependencies are inferred from the claim text.