INTERLOCKING BUILDING BLOCK

摘要

A block body (9), comprising a front surface (11) and back surface (12) being substantially parallel to each other and separated by a distance comprising the depth of the block, a planar upper surface (10) and lower surface (16) being substantially parallel to each other and separated by a distance comprising the height of the block, with opposed first (17) and second (18) sidewall surfaces being substantially parallel to each other and separated by a distance comprising the width of the block and adjoining the upper and lower surfaces, each sidewall surface has a first part (13, 19), second part (14, 20) and third part (15, 21), sidewall surface first part (13, 19) extending from the front surface (11) and defining a preferred arc (B) of more than 90 degrees and less than 300 degrees for more than 1/3 and less than 1/2 the depth of the block, sidewall surface third part (15, 21) extending from the back surface (12) and defining a preferred arc (B) of more than 90 degrees and less than 300 degrees of more than 1/3 and less than 1/2 the depth of the block, sidewall surface first part (13, 19) and sidewall surface third part (15, 21) are preferably equal, sidewall surface second part (14, 20) adjoining sidewall surface first (13, 19) and third (15, 21) parts and defining an inward preferred arc for a distance (A) of more than 1/3 and less than 1/2 the width of the block, wherein the distance (D) between sidewall surface second part (14, 20) at its closest point to block front surface (11) and back surface (12) being less that opening (C) between sidewall surface first part (13, 19) and sidewall surface third part (15, 21) at their closest point.