Building block

Abstract

The building block with an open top and bottom. One end of the block is provided with a pair of vertical slots and the other end of the block is provided with a pair of vertical fins for insertion into the vertical slots of an adjacent block. The bottom of the block is provided with a pair of horizontal slots and the top of the block is provided with a pair of horizontal fins for insertion into the horizontal slots of an overlying block. The horizontal fins and slots are respectively provided with pegs and holes that, in adjacent blocks, can be brought into registry with one another. One end of the block is also provided with a notch and the other end of the block is provided with a key for insertion into a notch in an adjacent block.

1 . A building block, comprising: 
 a front wall having a top, bottom and opposed ends, said front wall also having a first horizontal fin extending upwardly from the top thereof and a first horizontal slot in the bottom thereof, said front wall further having a first vertical fin extending outwardly from one of said opposed ends thereof and a first vertical slot in the other of said opposed ends thereof, said front wall additionally having a first pair of connecting pegs extending upwardly from said first horizontal fin and a first pair of holes penetrating said first horizontal slot for receiving a first pair of connecting pegs from another building block;    a back wall having a top, bottom and opposed ends and being positioned adjacent to said front wall, said back wall also having a second horizontal fin extending upwardly from the top thereof and a second horizontal slot in the bottom thereof, said back wall further having a second vertical fin extending outwardly from one of said opposed ends thereof and a second vertical slot in the other of said opposed ends thereof, said back wall additionally having a second pair of connecting pegs extending upwardly from said second vertical fin and a second pair of holes penetrating said second horizontal slot for receiving a second pair of connecting pegs from another building block;    a pair of side walls connecting said front wall to said back wall so as to form a rectangular box with an open top and an open bottom, one of said side walls having a key extending outwardly from the top thereof and the other one of said side walls having a notch in the top thereof adapted to receive a key extending from another building block.    
     
     
         2 . The building block according to  claim 1  wherein said front wall tapers in thickness from its bottom to its top.  
     
     
         3 . The building block according to  claim 1  wherein said front wall, said back wall, said pair of side walls, said horizontal fins, said vertical fins, said connecting pegs, and said key are integrally formed.