| 摘要 |
A plastic building block comprising a pair of spaced side walls, a front end wall, a rear end wall, and a bottom wall that form a rectangular box-like shape with an open top. Each side wall has a thickened reinforced layer and a thinner border area. The rear end of each side wall has a cut-away section of reduced thickness and the forward end of each side wall includes a leading section that extends beyond the front end wall. Complementary, angularly oriented tongues and grooves are defined between the leading sections of a first block and the cut-away sections of a second block. Adjacent, identical blocks are assembled into wall sections by sliding the tongues of the first block into the grooves of the second block, or vice versa, so that the thinner leading sections of the first block straddle the cut-away sections of the second block and overlap the joints formed therebetween. THe thinner border area of an upper block, which is coextensive with the exterior face of said block, straddles the border area of a lower block, said border area being coextensive with the interior face of said block. Thus, the joints formed between the upper block and the lower block are overlapped.
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