Nodal elements with channels for push-fitted rods

Claim 1

A constructional toy comprising a plurality of nodal elements and a plurality of co-operating rod elements; each said nodal element being substantially spherical and having a plurality of channels formed upon its peripheral surface, including a first channel encircling said nodal element so as to pass through the poles thereof (as hereinbefore defined) and at least four other channels spaced about said peripheral surface so as to be intercepted by said first channel adjacent the poles of said nodal element, the lips of each said channel having inwardly projecting beads thereon; each said rod element comprising a shank having a connecting portion at each end thereof, said connecting portion including an annular groove and having a longitudinal cross-section of substantially the same configuration as the transverse cross-section of each said channel; whereby, when a said connecting portion of a said rod element is `push-fitted` into a co-operating channel, it is held therein by virtue of the engagement of a said lip bead within the annular groove of said connecting portion in such a manner that the longitudinal axis of the said rod element is in substantial alignment with the geometrical centre of the nodal element.