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.

Abstract: For use in a trailing arm assembly having a support frame and a spring-loaded trailing arm pivotally mounted on the support frame, an adjustable stop element is provided for limiting the downward deflection of the trailing arm. The stop element is a rotatable eccentrically mounted element having a polygonal cross section, the surfaces around the polygon adjustably engaging the underside of the trailing arm, thereby adjustably limiting the downward deflection of the trailing arm. The deflection limiting element may conveniently be in the form of a rectangular parallelepiped eccentrically mounted between two guide plates which provide lateral support for the trailing arm.