Sectional cubic block

Abstract

A sectional cubic block includes a plurality of layers of structural elements, a smallest one of which is an elementary cube and the other ones are proportionally increased in dimensions based on the elementary cube and all include three plane walls that separately extend in directions of x, y and z axes and therefore define an inner space adapted to receive a next smaller structural elements therein. Each of the structural elements, except the smallest one, is formed from a plurality of elementary frames sequentially proportionally increased in dimensions based on the elementary cube. Each of the elementary frames includes three continued right-angled parts that are respectively included in three planes extended in the directions of x, y and z axes. This particular configuration of the elementary frames enables children to freely stack the elementary frames to create many changeful shapes.

What is claimed is:  
     
         1 . A sectional cubic block comprising more than two structural elements, a smallest one of said structural elements being an elementary cube of said sectional cubic block and the other ones of said structural elements being sequentially proportionally increased in dimensions using said elementary cube as one unit of measurement; all said structural elements, except said elementary cube, including three plane walls that separately extend in three different directions of x, y and z axes and therefore define an inner space for each of said structural elements; and a proportionally smaller one of said structural elements being adapted to fitly and removably position in said inner space of a next larger one of said structural elements, such that said structural elements, starting from said smallest one, could be sequentially received in said inner spaces of a next larger one of said structural elements to form a complete sectional cubic block; and 
 all said structural elements being respectively formed from a plurality of elementary frames, a smallest one of said elementary frames of each said structural elements being identical to said smallest structural element and accordingly said elementary cube of said sectional cubic block, and the other ones of said elementary frames of each said structural elements being sequentially proportionally increased in dimensions using said smallest elementary frame as one unit of measurement; each of said elementary frames that are not said elementary cubes being included in a virtual cubic solid and constituting two adjacent edges of each side of said virtual cubic solid, that is, each of said elementary frames that are not said elementary cubes including three continued right-angled parts that are respectively included in three planes extended in the directions of x, y and z axes and thereby together define an inner space for said elementary frame, and each of said elementary frames that are not the smallest and the next smallest ones among all said elementary frames defining an central opening via which said inner space communicates an inner side with an outer side of each said elementary frame; whereby said elementary frames could be freely stacked to obtain changeful shapes.    
     
     
         2 . The sectional cubic block as claimed in  claim 1 , wherein all said elementary frames are integrally formed.  
     
     
         3 . The sectional cubic block as claimed in  claim 2 , wherein all said elementary frames that are not said elementary cubes are provided on their respective three right-angled parts with unit marks using said smallest elementary cube as one unit, so that how many units of said elementary cubes are included in each of said elementary frames could be easily visually decided.  
     
     
         4 . The sectional cubic block as claimed in  claim 1 , wherein all said elementary frames that are not said elementary cubes are formed by connecting a predetermined number of said smallest elementary frames (that is, said elementary cubes) to one another.  
     
     
         5 . The sectional cubic block as claimed in  claim 4 , wherein each of said elementary cubes, that is, the smallest unit of said elementary frames, is provided on at least one of six sides thereof with an insert bar and on the other five sides thereof with more than one insert hole, and each of said insert bars is adapted to firmly insert into any one of said insert holes.