Patent ID: 6539682
Filing Date: 2003-04-01
Classification: E04B

Abstract:
A building block comprising sidewalls, endwalls having vertical keyslots therein each having an entry portion and a widened subsequent portion, at least one vertical cavity or slot, at least one first channel in the upper surfaces of the endwalls extending substantially throughout the width of the block and at least one second inverted channel in the lower surfaces of the endwalls extending substantially throughout the width of the block and intruding into the sidewalls of the blocks, the arrangement and construction being such that when blocks are laid one upon another in courses and the endwalls of blocks are joined by placement of keys in the keyslots the channels and the said at least one cavity or slot of the blocks will be aligned to provide an internal network of horizontal and vertical infill passages which can be filled with a settable material to seal joints between the blocks and to provide load bearing support between respective side and endwall courses of the blocks.