Functional pillow

Abstract

The present invention provides a functional pillow filled with filling, the functional pillow comprising the filling having a tetrahedron shape having three triangle flat faces; wherein the bottom of the tetrahedron shape is open, and the inside of the tetrahedron shape is an empty space; wherein the tetrahedron shape comprises: a protruding edge portion that connects adjacent two faces of the flat faces, that protrudes from each of the flat faces, and that has a semicircle pipe shape; an apex portion that connects three protruding edge portions and that has an opening; a groove that is formed in a center portion of an outer surface of each of the flat face, and a bump portion that is formed in an inner surface of each of the flat faces and that protrudes toward a center of the opening of the bottom.

What is claimed is: 
     
         1 . A functional pillow filled with fillings, the functional pillow comprising:
 the filling having a tetrahedron shape having three triangle flat faces;   wherein the bottom of the tetrahedron shape is open, and the inside of the tetrahedron shape is an empty space;   wherein the tetrahedron shape comprises:
 a protruding edge portion that connects adjacent two faces of the flat faces, that protrudes from each of the flat faces, and that has a semicircle pipe shape; 
 an apex portion that connects three protruding edge portions and that has an opening; 
 a groove that is formed in a center portion of an outer surface of each of the flat face, and 
 a bump portion that is formed in an inner surface of each of the flat faces and that protrudes toward a center of the opening of the bottom. 
   
     
     
         2 . The functional pillow according to  claim 1 , wherein the filling is made of elastic materials. 
     
     
         3 . The functional pillow according to  claim 1 , wherein a size of an opening in the bottom of the tetrahedron shape is reduced by the space occupancy of the bottom of the bump portion to the extent that one filling is only partially inserted into an empty space of another filing.