Assembly unit for toy assembly block

Abstract

An assembly unit includes side plate having first coupling member on first side, second coupling member on second side, and third coupling member on each of third and fourth sides, top plate including fourth coupling member and top stud, and bottom plate including fifth coupling member and bottom stud. The first coupling member is engaged with the second coupling member of neighboring side plate. The fourth coupling member is engaged with the third coupling member. The fifth coupling member is engaged with the third coupling member. The first coupling member includes protrusion. The second coupling member includes groove. The protrusion is fitted into the groove of the neighboring side plate. The third coupling member includes thread. Each of the fourth and fifth coupling members includes thread. The fourth and fifth coupling members are engaged with the third coupling member in a screwed manner using the threads.

What is claimed is: 
     
         1 . An assembly unit for a toy assembly block, the assembly unit comprising:
 a side plate having a plate shape and including a first coupling member on a first side, a second coupling member on a second side, and a third coupling member on each of a third side and a fourth side;   a top plate having a plate shape and including a fourth coupling member on each side and a top stud on a top surface; and   a bottom plate having a plate shape and including a fifth coupling member on each side and a bottom stud on a bottom surface, wherein   the first coupling member of the side plate is configured to be engaged with the second coupling member of a neighboring side plate of a same type as the side plate,   the fourth coupling member of the top plate is configured to be engaged with the third coupling member of the side plate,   the fifth coupling member of the bottom plate is configured to be engaged with the third coupling member of the side plate,   the first coupling member includes a protrusion,   the second coupling member includes a groove,   when the first coupling member of the side plate is engaged with the second coupling member of the neighboring side plate, the protrusion of the side plate is fitted into the groove of the neighboring side plate,   the third coupling member includes a thread,   each of the fourth coupling member and the fifth coupling member includes a thread corresponding to the thread of the third coupling member, and   the fourth coupling member and the fifth coupling member are configured to be engaged with the third coupling member in a screwed manner using the threads.   
     
     
         2 . The assembly unit according to  claim 1 , further comprising an internal protrusion inside the top stud. 
     
     
         3 . An assembly unit for a toy assembly block, the assembly unit comprising:
 a side plate having a plate shape and including a first coupling member on a first side, a second coupling member on a second side, and a third coupling member on each of a third side and a fourth side;   a top plate having a plate shape and including a fourth coupling member on each side and a top stud on a top surface; and   a bottom plate having a plate shape and including a fifth coupling member on each side and a bottom stud on a bottom surface, wherein   the first coupling member of the side plate is configured to be engaged with the second coupling member of a neighboring side plate of a same type as the side plate,   the fourth coupling member of the top plate is configured to be engaged with the third coupling member of the side plate,   the fifth coupling member of the bottom plate is configured to be engaged with the third coupling member of the side plate,   the third coupling member includes a thread,   each of the fourth coupling member and the fifth coupling member includes a thread corresponding to the thread of the third coupling member, and   the fourth coupling member and the fifth coupling member are configured to be engaged with the third coupling member in a screwed manner using the threads.   
     
     
         4 . The assembly unit according to  claim 3 , wherein
 the first coupling member includes a protrusion,   the second coupling member includes a groove, and   when the first coupling member of the side plate is engaged with the second coupling member of the neighboring side plate, the protrusion of the side plate is fitted into the groove of the neighboring side plate.   
     
     
         5 . The assembly unit according to  claim 3 , wherein
 the third coupling member includes a pillar extending from the side plate and a hook formed at an end of the pillar,   each of the fourth coupling member and the fifth coupling member includes a hole,   when the fourth coupling member of the top plate is engaged with the third coupling member of the side plate, the hook of the third coupling member is inserted into the hole of the fourth coupling member, and   when the fifth coupling member of the bottom plate is engaged with the third coupling member of the side plate, the hook of the third coupling member is inserted into the hole of the fifth coupling member.   
     
     
         6 . The assembly unit according to  claim 3 , wherein
 each of the fourth coupling member and the fifth coupling member includes a protrusion,   the third coupling member includes a rail structure to guide the protrusion, and   the fourth coupling member and the fifth coupling member are configured to be engaged with the third coupling member by sliding the protrusion through the rail structure.   
     
     
         7 . The assembly unit according to  claim 3 , further comprising an internal protrusion inside the top stud.