Patent ID: 6923705

Claim:
Structural building elements for use in building a play structure from a plurality of said structural building elements, said structural building elements comprising: an expanded polyethylene building element of substantially cylindrical shape, said cylindrical element including at least one interlocking notch permitting connection of said cylindrical element to another cylindrical element by interlocking corresponding notches of said elements oriented lengthwise perpendicular to each other; an expanded polyethylene building element of substantially planar panel shape, said planar element including at least one interlocking link permitting connection of said planar element to another planar element, and at least one aperture; an expanded polyethylene building element of substantially triangular panel shape, said triangular shape having at least one acute angle, said triangular element including at least one interlocking link and one interlocking link notch permitting connection of said triangular element to another triangular element by insertion of interlocking link into interlocking link notch, at least one interlocking notch permitting connection of said triangular element to said cylindrical element by interlocking notch of triangular element with corresponding notch of cylindrical element oriented perpendicular to each other, and one tooth extending outward permitting connection of said triangular element with a planar element by insertion of said tooth into aperture in said planar element; an expanded polyethylene building element of substantially cylindrical shape, said cylindrical element including at least one interlocking notch permitting connection of said cylindrical element to another cylindrical element by interlocking corresponding notches of said elements oriented lengthwise perpendicular to each other one or more end notches, and one or more intermediate notches at an acute angle offset from the end notches, said angle corresponding to one of the acute angles of the triangular panel element, said intermediate notches permitting connection with another cylindrical element by interlocking corresponding notches of said cylindrical elements oriented lengthwise perpendicular to each other, and an expanded polyethylene building element of substantially square panel shape, said square element including at least one interlocking link and one interlocking link notch permitting connection of said square element to another square element by insertion of interlocking link into interlocking link notch, and at least one tooth extending outward permitting connection of said square element with a planar element by insertion of said tooth into aperture in said planar element.