Patent ID: 6108995
Filing Date: 2000-08-29
Classification: B09B,E02D,E04B,E04F

Abstract:
A tongue and mortise block, for use in the construction of a wall wherein a plurality of like blocks are stacked in successive mortarless overlapping courses so as to define a wall face,said tongue and mortise block comprisingtwo side ends spaced apart bya top facea bottom facea front face anda rear facesaid top face comprising a tongue interlock element and a declining face portion, said declining face portion connecting the tongue interlock element to the front face, said bottom face comprising a mortise interlock element and a forward face portion, said forward face portion connecting the mortise interlock element to the front face,said two side ends, said top face, said bottom face, said front face and said rear face being configured such that, when said block and an underlying, like, block form part of the wall and the bottom face of the block engages the top face of a said underlying, like, block such that the front face of the block defines a portion of the wall face,the tongue interlock element of said underlying block is able to register in the mortise interlock element of the block so as to be able to interlock both blocks such that relative forward and rearward displacement is inhibited, andthe front face of the block is vertically offset downwardly relative to the tongue element and the rear face thereof.