Patent ID: 7063587
Filing Date: 2006-06-20
Classification: A63H

Abstract:
1. A building block, comprising a first and a second square frame perpendicularly connected to each other at inner edges thereof, and a hypotenuse frame extended between outer edges of said first and said second frame; said first and second square frames and said hypotenuse frame respectively having an outer frame portion and a cross-shaped rib portion located within said outer frame portion; said cross-shaped rib portion on each of said square and hypotenuse frames dividing a space enclosed in said frame into four equal divisions; and said four equal divisions being four cavities on said first square frame, being two diagonally opposite connecting protrusions and two cavities diagonally located at two sides of said two connecting protrusions on said second square frame; and being two diagonally opposite connecting protrusions and two rectangular cavities diagonally located at two sides of said two connecting protrusions on said hypotenuse frame.