Toy construction set

Claim 1

A toy construction set, comprising: a plurality of one-piece corner posts comprising: a first group each comprising a leg, first and second groups of two arms each extending outwardly from the ends of said leg, a locking cavity formed within the end of each of said arms, and a locking cavity formed within one end of said leg; and a second group each comprising a leg, first and second groups of two arms each extending outwardly from an end and midportion of said leg, respectively, a locking cavity formed within the end of each of said arms, a locking cavity formed within said end of said leg, and a locking projection formed at the other end of said leg; a plurality of one-piece middle post comprising: a first group each comprising a leg, first and second groups of three arms each extending outwardly from the ends of said leg, a locking cavity formed within the end of each of said arms, and a locking cavity formed within one end of said leg; a second group each comprising a leg, first and second groups of three arms each extending outwardly from an end and midportion of said leg, respectively, a locking cavity formed within the end of each of said arms, a locking cavity formed within said end of said leg, and a locking projection formed at the other end of said leg; a plurality of one-piece center posts comprising: a first group each comprising a leg, first and second groups of four arms each extending outwardly from the end of said leg, a locking cavity formed within the end of each of said arms, and a locking cavity formed within one end of said leg; a second group each comprising a leg, first and second groups of four arms each extending outwardly from an end and midportion of said leg, respectively, a locking cavity formed within the end of each of said arms, a locking cavity formed within said end of said leg, and a locking projection formed at the other end of said leg; a plurality of one-piece beams terminating at each end thereof in locking projections; said locking projections of said second group of said corner, middle and center posts, respectively, being complimentary in configuration with respect to said locking cavities of said legs of said first and second groups of said corner, middle and center posts, respectively; and said locking projections of said beams being complimentary in configuration with respect to said locking cavities of said arms of said first and second groups of said corner, middle, and center posts, respectively; said legs of said first and second groups of said corner, middle, and center posts being of uniform cross-sectional area between the respective groups of arms, and wherein said locking cavities of said legs of said first and second groups of said corner, middle and center posts are square in cross-section and wherein said locking projections of said second group of said corner, middle and center posts are square in cross-section enabling same to be fitted within said locking cavities of said legs of said first and second groups of said corner, middle and center posts; said arms of said first and second groups of said corner, middle and center posts being rectangular in cross-section and of the same dimension, and wherein said locking cavities of said arms of said first and second groups of said corner, middle and center posts are rectangular in cross-section and said locking projections of said beams are rectangular in cross-section enabling same to be fitted within said locking cavities of said arms; wherein certain of said locking cavities formed within the ends of said arms of said first and second groups of said corner, middle and center posts each comprise a first wall provided with an opening therein, a second wall spaced from said first wall and positioned opposite said opening in said first wall, and top and bottom walls connecting said first and second walls.