Positioning device for connecting cap to cup

Abstract

A paper-made cup has a plastic lip portion connected along the open top thereof and multiple first engaging portions are formed on the outer periphery of the lip portion. A cap has multiple second engaging portions on the inside of the skirt portion thereof. The cap is mounted to the open top of the cup, and the first and second engaging portions are engaged with each other to position the cap on the cup.

1 . A combination of cup and cap, comprising:
 a paper-made cup having a plastic lip portion connected along an open top of the cup, multiple first engaging portions formed separately about an outer periphery of the lip portion, and a cap having multiple second engaging portions formed separately about an inside of a skirt portion of the cap, the cap mounted to the open top of the cup, the first and second engaging portions being engageable and disengageable with each other without damaging the cup or cap.   
     
     
         2 . The combination as claimed in  claim 1 , wherein the lip portion and the first engaging portions are made of bio-degradable material. 
     
     
         3 . The combination as claimed in  claim 1 , wherein the cap is made of bio-degradable material. 
     
     
         4 . The combination as claimed in  claim 1 , wherein the first engaging portions are located at even angular distance along the outer periphery of the lip portion, the first engaging portions each are a block which has a first inclined surface, the second engaging portions are located at even angular distance at the inside of the skirt of the cap, the second engaging portions each have a rib which forms a recess and has a second inclined surface, the first and second inclined surfaces are engaged with each other to position the cap to the cup.