Double structure cup

Abstract

A double structure cup is disclosed, which is characterized in that a plurality of polygonal male protrusions are protruded from a bottom surface of the inner cup in a downward direction, and a plurality of concave protrusions are formed and engaged with the male protrusions on a bottom surface of the outer cup in an upward direction, so that as the male protrusions are engaged with the concave protrusions, the inner cup does not rotate along with the lid when the lid is rotated for opening and closing.

1 . In a double structure cup which includes an inner cup for storing a certain stuff with its upper side being open, an outer cup which is spaced apart from the inner cup while surrounding the same and being engaged thereto, and a lid thread-engaged to an upper side of the inner cup for opening and closing the same, a double structure cup characterized in that a plurality of polygonal male protrusions are protruded from a bottom surface of the inner cup in a downward direction, and a plurality of concave protrusions are formed and engaged with the male protrusions on a bottom surface of the outer cup in an upward direction, so that as the male protrusions are engaged with the concave protrusions, the inner cup does not rotate along with the lid when the lid is rotated for opening and closing. 
   
   
       2 . The structure of  claim 1 , wherein said outer and inner cups are engaged using a detachable engaging member. 
   
   
       3 . The structure of either  claim 1  or  claim 2 , wherein said lid is engaged to the inner cup while being sealed using a packing. 
   
   
       4 . The structure of either  claim 1  or  claim 2 , wherein an outer side surface of the male protrusion and an inner side surface of the concave protrusion are gradually narrowed in a downward direction and correspond to each other. 
   
   
       5 . The structure of  claim 1 , wherein an upside down cup shape bent part is downwardly bent in an outward direction from an upper side of the inner cup, so that a space of which a lower side is open is formed between the side surface of the inner cup and the bent part, and an upper side of the outer cup is inserted into the space.