Patent ID: 8771032

Claim:
A block assembly comprising: at least two blocks detachably connected with each other; wherein: each of the blocks includes: a box-shaped main body having a bottom provided with a receiving space; at least one connecting knob formed on a top of the main body; a plurality of positioning rails formed on a peripheral wall of the receiving space of the main body; and at least one positioning piece located in the receiving space of the main body; the positioning piece of each of the at least two blocks has a periphery provided with at least four positioning faces each of which has a substantially arcuate shape; when the blocks are connected, the connecting knob of a first one of the at least two blocks is inserted into the receiving space of the main body of a second one of the at least two blocks, and is clamped between the positioning piece and at least one of the positioning rails of the second one of the at least two blocks; the connecting knob of the first one of the blocks has a periphery abutting one of the positioning faces of the positioning piece of the second one of the at least two blocks exactly and closely; the connecting knob of each of the at least two blocks has a top face provided with a chamfered portion; each of the positioning rails of each of the at least two blocks has a bottom provided with a chamfered portion; and each of the positioning faces of the positioning piece of each of the at least two blocks has a bottom provided with a chamfered portion.