US 4,474,376 AGranted

Manipulable icosahedron toy

OwnerWilliam O. Gustafsoninventor

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Abstract

A puzzle corresponding to a regular icosahedron in which the twenty faces of the icosahedron are detached yet movable, the puzzle including a spherical core; twelve mushroom-shaped holding pins extending from the core individually at locations corresponding to icosahedral vertex points and having a head spaced from the core; a plurality of turning elements extending between adjacant holding pins and slidably engaged between the heads and the core for pivotal movement in multiple of seventy-two degree rotation about a selected one of such adjacent holding pins; and a plurality of exterior plates fixedly and individually mounted on the turning elements for pivotal movement with the turning elements, the exterior plates having varigated surfaces which can be brought by a succession of movements into a preferred arrangement after having been scrambled by rotation about various axes. The exterior plates of the puzzle corresponding to the faces of the icosahedron.

Claims1

Dependent claims

A manipulable icosahedron toy comprising:

(a) a spherical core with twelve small holes each spaced 63.43 degrees from each of five other holes and in the centers of each of the twenty triangular regions formed by three adjacent holes is a small detent;
(b) twelve holding pins each comprising three successive concentric circular sections of spherical shells, the outer most section being approximately thirty-six degrees in diameter, the middle section being approximately ten degrees in diameter and the innermost section whose diameter matches the holes in the core for bonding thereto:
(c) twenty turning plates of spherical curvature whose concave surface substantially conforms to the core, the sides of the turning plates are arcs of small circles 58.28 degrees in radius, at the center of the concave surface of each turning plate is a small indent matching the detent in the core, at the center of outside surface of each turning plates is a small raised triangular region:
(d) twenty flat triangular plates beveled inwardly with a small triangular region indented at its inside center and each bonded to one of the small raised triangular regions of a turning plate.

1 more element

Dependencies are inferred from the claim text.