PUZZLE "HORNED RIDDLE" Russian patent published in 1994 - IPC

FIELD: logic thinking development. SUBSTANCE: puzzle has playing members attached one to another. Any playing member may be withdrawn with the other playing member simultaneously only. Puzzle has additional playing member, disposed in central part of the puzzle and provided with pins protruding from outside. The pins pass through gaps between playing members or through holes in playing members. Joined surfaces of slipping of the playing members have such friction coefficient, that centrifugal forces, which are present when twisting puzzle, excess over friction forces among playing members. Playing is concluded in knocking down and subsequent mounting puzzle. EFFECT: improved efficiency. 2 cl, 9 dwg