Invention Grant
US4221386A Ring and loop puzzle 失效
戒指和循环难题

Ring and loop puzzle
Abstract:
A ring and loop puzzle having a pair of spaced vertically upstanding members affixed at their bottom to a common rigid base and at their top to an upper frame section having an aperture therein. To each of the rods are rigidly affixed a set of horizontally extending posts vertically aligned and spaced such that the posts of one set alternate but only partially mesh with the posts of the other set. The ends of the posts are formed into eyes which loosely capture respective rings that hang vertically downward such that each ring encircles two underlying posts between the eye and fixed end of each such underlying post, except that the ring next to the bottom encircles only one underlying post and the bottom ring, no posts. Used in conjunction with the puzzle is a flexible closed loop line which is manipulated through and over the rings in working the puzzle. The unique arrangement of the posts and associated rings makes this puzzle relatively different and somewhat more complicated to solve than those disclosed by the prior art.
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