Set of castle building blocks

Abstract

A set of castle building blocks comprising a plurality of brick units, city wall units, cylinder units, tower units, and connection units. All of the units excluded the connection units have at least two blind holes. Each connection unit includes a rod section and a head section connected with each other. The rod section inserts into the corresponding blind hole. The head section detachably inserts into the blind hole of one of the units excluded the connection units. A plurality of convex arc portions is inclined and extended upwardly and outwardly from the rod section axially. The head section includes a main body, a hollow portion, and a concave groove. The concave groove of the connection unit is arranged so that the main body of the head section has a space to elastically insert into the blind hole of other unit excluded the connection units.

What is claimed is: 
     
         1 . A set of castle building blocks, at least comprising a plurality of brick units, a plurality of city wall units, a plurality of cylinder units, a plurality of tower units, and a plurality of connection units, all of the units excluded the connection units have at least two blind holes, one of the at least two blind holes is provided one of the connection units to insert and fasten and the other one thereof is provided the connection unit which is fastened to other units to detachably insert and fasten, wherein:
 each connection unit includes a rod section and a head section, a top end of the rod section is connected to the head section, the rod section inserts into the corresponding blind hole, the head section detachably inserts into the blind hole of one of the units excluded the connection units, a plurality of convex arc portions is inclined and extended upwardly and outwardly from the rod section axially, the head section includes a main body, a hollow portion, and a concave groove, the hollow portion passes through a center of the main body, the concave groove is concavely formed at the main body and extended from one end of the main body opposite to the rod section toward the rod section and fluidly communicated with the hollow portion, and a convex hook portion is formed downwardly and outwardly at a peripheral of a part of the main body opposite to the rod section.   
     
     
         2 . The set of castle building blocks as claimed in  claim 1 , wherein a front side and a rear side of the rod section respectively form a flat portion, and the convex arc portions are axially formed at a left side and a right side of the rod section. 
     
     
         3 . The set of castle building blocks as claimed in  claim 1 , wherein each brick unit is cube with six surfaces, the blind hole is formed at a center of each surface, a front side surface, a rear side surface, a left side surface, and a right side surface of each brick unit form a longitudinal concave groove respectively, and each longitudinal concave groove is fluidly communicated with the corresponding blind hole of the same brick unit. 
     
     
         4 . The set of castle building blocks as claimed in  claim 3 , wherein each city wall unit includes a wall body and two protruding portions, the two protruding portions are respectively extended from lower sides of two sides of the wall body outwardly, one end of each protruding portion opposite to the wall body has the blind hole, each connection unit inserts into the corresponding blind hole, and each protruding portion is embedded into corresponding longitudinal concave groove of other brick unit. 
     
     
         5 . The set of castle building blocks as claimed in  claim 3 , wherein a top surface and a bottom surface of each cylinder unit form the blind hole respectively, and the blind hole of the top surface of each cylinder unit is provided the rod section of the connection unit to insert. 
     
     
         6 . The set of castle building blocks as claimed in  claim 1 , wherein a bottom surface of each tower unit forms the blind hole. 
     
     
         7 . The set of castle building blocks as claimed in  claim 3 , further comprising at least one arch unit which includes a door body and two projection portions, the two projection portions are respectively extended outwardly from lower ends of two sides of the door body, the blind hole is formed at one side of each projection portion opposite to the door body, each blind hole is inserted by corresponding connection unit, and each projection portion may embed into corresponding longitudinal concave groove of other brick unit. 
     
     
         8 . The set of castle building blocks as claimed in  claim 3 , further comprising at least one underbrush unit which includes an underbrush body, one side of the underbrush body is a vertical side, the blind hole is formed at a lower end of the vertical side, the blind hole is provided the corresponding connection unit to insert, the vertical side may embed into the corresponding longitudinal concave groove of other brick unit.