Joint brick for building block

Abstract

A joint brick for a building block is pivotally connected between the building blocks to work as a joint of the limbs. The joint brick includes two side plates and two axial post disposed between the side plates to be pivotally connected with engaging recesses of other building blocks. When the axial posts disposed at a top end and a bottom end of the joint brick are pivotally connected with other building blocks, the limbs can substantially swing, extend and bend relative to each other to make playing the building blocks more convenient and more interesting.

1 . A joint brick for a building block, comprising:
 two side plates; and   axial posts disposed between the side plates, each axial post having an outer wall formed with a cylindrical surface configured for pivotally connecting with a recess opening of an engaging recess of the building block, the cylindrical surface having a ridge portion projected out of the cylindrical surface in a radial direction of the axial post, the ridge portion extended in an axial direction of the axial post;   wherein the ridge portion blocks an outer edge portion of the recess opening to limit an angle that the building block can pivotally swing relative to the joint brick around the axial post when the axial post is connected with the building block through the recess opening.   
     
     
         2 . (canceled) 
     
     
         3 . The joint brick according to  claim 1 , wherein the axial posts are disposed at positions adjacent to corners of the side plates. 
     
     
         4 . The joint brick according to  claim 1 , further comprising an engaging shaft disposed between the side plates to be engaged with the engaging recess of the building block, wherein the engaging shaft is disposed between the axial posts. 
     
     
         5 . The joint brick according to  claim 4 , wherein the positions of the axial posts and the engaging shaft are arranged as a triangle. 
     
     
         6 . The joint brick according to  claim 5 , wherein the ridge portion of each axial post is pointed toward the engaging shaft so that two building blocks pivotally connected respectively with two axial posts can only swing toward each other and away from the engaging shaft. 
     
     
         7 . The joint brick according to  claim 4 , wherein a portion of the engaging shaft is projected out of peripheries of the side plates. 
     
     
         8 . The joint brick according to  claim 5 , wherein a portion of the engaging shaft is projected out of peripheries of the side plates. 
     
     
         9 . The joint brick according to  claim 1 , wherein an outer wall of the side plate includes at least one stud to be engaged with the engaging recess of the building block. 
     
     
         10 . The joint brick according to  claim 4 , wherein an outer wall of the side plate includes at least one stud to be engaged with the engaging recess of the building block. 
     
     
         11 . The joint brick according to  claim 1 , wherein an outer wall of the side plate includes at least one engaging recess to be engaged with a stud of the building block. 
     
     
         12 . The joint brick according to  claim 4 , wherein an outer wall of the side plate includes at least one engaging recess to be engaged with a stud of the building block. 
     
     
         13 . The joint brick according to  claim 1 , wherein the axial post has a cross section shaped in a water drop. 
     
     
         14 . The joint brick according to  claim 4 , wherein the axial post has a cross section shaped in a water drop. 
     
     
         15 . The joint brick according to  claim 9 , wherein the axial post has a cross section shaped in a water drop.