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 . A double wall cup, comprising:
 an inner cup made of stainless steel;   a lid thread engaged to an upper side of the inner cup for opening and closing the inner cup by rotating the lid;   an outer cup made of transparent material for visibly seeing a printed content of an insertion sheet inserted between the inner cup and the outer cup and detachable from the inner cup for easily exchanging the insertion sheet;   a couple of flanges made of a material being able to be welded to a bottom surface of the inner cup, the flanges welded to the bottom surface;   a stainless steel plate including a main protrusion having a rectangular bottom surface bent and downwardly protruded from between the flanges, and an engaging hole formed at a center portion of the main protrusion;   a nut engaged by matching with the engaging hole in an inner side of the male protrusion;   a rectangular concave groove protrusion formed in an inner bottom portion of the outer cup and accommodating the main protrusion for thereby prevent rotation of the inner cup; and   an engaging member which is thread engaged to a lower side of the outer cup through the engaging hole.   
     
     
         2 . A double wall cup, comprising:
 an inner cup having a sidewall and a bottom wall;   a first protrusion extending downwardly from the inner cup bottom wall, the first protrusion having at least one straight wall;   an outer cup having a sidewall and a bottom wall, the outer cup surrounding the inner cup; and   a second protrusion extending upwardly from the outer cup bottom wall, the second protrusion having a recess, the first protrusion fitting within the recess to prevent rotation of the inner cup relative to the outer cup.   
     
     
         3 . The double wall cup of  claim 2 , wherein the first protrusion is formed by a U-shaped member having a bottom wall and a pair of sidewalls extending upwardly from the bottom wall of the U-shaped member. 
     
     
         4 . The double wall cup of  claim 3 , wherein the first protrusion further comprises a flange extending from each sidewall to attach the first protrusion to the bottom of the inner cup. 
     
     
         5 . The double wall cup of  claim 3 , further comprising:
 a first aperture in the bottom wall of the first protrusion;   a second aperture in the bottom wall of the outer cup; and   a fastener extending through the first aperture and the second aperture.   
     
     
         6 . The double wall cup of  claim 5 , further comprising a nut secured to the fastener. 
     
     
         7 . A double wall cup, comprising:
 an inner cup having a sidewall and a bottom wall;   a first protrusion extending from the inner cup bottom wall, the first protrusion having at least one straight wall;   an outer cup having a sidewall and a bottom wall, the outer cup surrounding the inner cup; and   a recess formed in the outer cup bottom wall, the first protrusion fitting within the recess to prevent rotation of the inner cup relative to the outer cup.   
     
     
         8 . The double wall cup of  claim 7 , wherein the first protrusion is formed by a U-shaped member having a bottom wall and a pair of sidewalls extending upwardly from the bottom wall of the U-shaped member. 
     
     
         9 . The double wall cup of  claim 8 , wherein the first protrusion further comprises a flange extending from each sidewall to attach the first protrusion to the bottom of the inner cup. 
     
     
         10 . The double wall cup of  claim 8 , further comprising:
 a first aperture in the bottom wall of the first protrusion;   a second aperture in the bottom wall of the outer cup; and   a fastener extending through the first aperture and the second aperture.   
     
     
         11 . The double wall cup of  claim 10 , further comprising a nut secured to the fastener.