Fastening interlock with hinge function

Claim 1

A structural interlock system comprising: a plurality of structural members each having first and second spaced-apart walls; each wall having an upper end section and a lower end section; the upper end sections of the first wall of each member being elevated relative to the upper end sections of the second wall; right angular shoulder sections extending from the upper end sections of the walls, said shoulder sections being joined together at a flat connecting portion, the connecting portion being right angularly arranged with respect to the shoulder sections; outwardly flared, right angular interlock arms projecting from the connecting portion, the arms of the first wall being elevated with respect to the arms of the second walls; a series of depending knobs on said interlock arms; the lower end section of the second wall being extended below the lower end section of the first wall; inwardly directed, right angular, spaced-apart connection teeth on the distal extremity of each of the lower end sections, defining an opening therebetween; the depending knobs engaging the teeth and being located between the teeth and the walls; and the interlock arms being disposed between the lower end sections of a next adjacent structural member, whereby the members are hingedly secured to one another.