Abstract: Toy building blocks of the type having an array of sockets on one principal face and a matching array of projections on the opposite face that can be wedged into the sockets of another block are also joinable in an end to end relationship which enables lateral pivoting of one block in either direction relative to the block with which it is linked. In the preferred form, the opposite ends of the blocks are linkable to still other blocks in a manner which enables pivoting or flexing in an orthogonal direction. This enables assembly of interlocking blocks into a greater variety of different constructions and enables pivoting of linked portions of an assembled construction in a greater number of different directions.

Abstract: A toy building block construction includes a lower portion having a generally rectangular solid configuration and an integral upper portion extending therefrom. Extending outwardly from one end of the lower portion are two pair of hinge arms, each pair of arms being spaced apart in laterally opposed, parallel fashion. Each hinge arm includes a detent knob formed on the interior surface thereof confronting the paired, opposing arm. A third pair of identical hinge arms extends upwardly from the top of the upper portion. The end of the lower portion opposed to the one end includes two pair of detent recesses formed in laterally spaced fashion in opposed edges of the lower portion, each detent recess including a detent depression formed therein. Each detent recess is adapted to receive a hinge arm of an adjacent, similar block, with the detent knob of the arm engaged in the detent depression in freely pivoting fashion.

Abstract: Rotatable assemblies for building blocks include a wheel having a peripheral annular cylindrical surface adapted to support building blocks joined thereabout in hinged, end to end fashion, the wheel including annular flanges extending radially outwardly and spaced axially to retain the blocks therebetween. A pivot shaft extends fixedly from a first end surface of the wheel, and is disposed coaxially therewith. The opposed, second end surface includes a coaxially disposed bore dimensioned to receive a pivot shaft of another, similar wheel. A plurality of cylindrical interconnection projections extend from the second end face and are arrayed symmetrically about the bore. A plurality of socket-like interconnection receptacles are formed in the second end face and interspersed with the cylindrical projections. The first end face also includes a like plurality of interconnection receptacles disposed to engage the cylindrical projections of another like-formed wheel for stackable interconnection therebetween.