Patent ID: 7305803

Claim:
A block construction system comprising: a first block defining a longitudinal axis and having a top face and a bottom face with opposed side faces and opposed end faces extending therebetween, wherein said top face is formed with at least one substantially flat horizontal raised portion positioned between a pair of longitudinally aligned rounded edges, wherein said top face is further formed with a pair of substantially flat horizontal stop surfaces, with each said stop surface positioned between a respective rounded edge and a respective side face, and wherein said first block forms an opening extending vertically between said top face and said bottom face, with said opening being positioned between said rounded edges; and a second block defining a longitudinal axis and having a top face and a bottom face with opposed side faces and opposed end faces extending therebetween, wherein said bottom face is formed with at least one substantially flat recessed portion positioned between a pair of longitudinally aligned curved surfaces that are shaped to substantially conform to said edges on said top face, said recessed portion for engaging said raised portion when said second block is stacked on said first block, wherein said bottom face is further formed with a pair of substantially flat horizontal stop surfaces, with each said stop surface positioned between a respective curved surface and a respective side face, said bottom face stop surfaces for engaging said top face stop surfaces to vertically align said first block with said second block, and wherein said second block forms an opening extending vertically between said top face and said bottom face of said second block with said second block opening being positioned between said curved surfaces, and further wherein said openings of said first block and said second block are vertically aligned when said second block is stacked on said first block to form a passageway through said blocks for receiving a support member.