Patent ID: 7818938

Claim:
A building system comprising: i) at least first, second, and third hollow blocks each having at least one side wall, and at least two end walls extending in at least one common direction, at least one of the walls in each block having a given wall thickness and being provided with at least a respective first cut-out extending completely throughout said given wall thickness at a first free end of said wall, said third block further comprising a centre cross member extending parallel to the end walls and having a member thickness twice the given wall thickness, said cross member defining two opposite free ends and being provided with a respective cut-out at one or both free ends thereof, said cut-out of said third block being identical in perimeter to said cut-outs of said first and second blocks; and ii) at least one connector element defining a hollow body having a shape and size conforming with a perimeter corresponding to a juxtaposition of said cut-outs of any two of said blocks for snug engagement within the perimeter, and at least one first flange projecting from a first end of the body and at least one second flange projecting from a second end of the body, said first and second flanges defining an intermediate spacing substantially equal to twice said given wall thickness, said first, second, and third blocks being connectable to one another for erecting structures by registering cut-outs of adjacent walls of said first and second blocks against each other and connecting said adjacent walls thereof together by snugly positioning the connector element in the cut-outs thereof with the first and second flanges abutting respectively on respective inner faces of each of the adjacent walls, thereby forming a first level from said first and second blocks with the connector element extending completely through the adjacent walls which are held between the first and second flanges, and by snugly positioning the cut-out of the cross member within the connector element with the first and second flanges abutting on opposing faces of the cross member, the third block thereby forming a second level connected to said first level with the opposing faces extending adjacently alongside said respective inner faces between the first and second flanges and the connector element extending completely through the cross member and walls at said cut-outs, the first and second flanges thereby preventing longitudinal movement of first ,second, and third blocks along an axis defined by said connector element.