Cap for a cup

Abstract

The cap of the present invention has a cap surface and an engaging portion. The engaging portion includes an annular inner wall, an annular outer wall and an upper section connecting between the inner wall and the outer wall. The outer wall includes a first section and a second section. The first section is downward extended from the upper section, and the first section has a distal end, from which the second section is extended outward and downward. At least one engaging rim is formed between the first and second sections inward. An annular engaging slot is defined between the inner wall, the first section and the upper section for the engaging lip to engage therewith. A distance between the engaging rim and the inner wall is smaller than the thickness of the engaging lip so as to prevent the engaging lip from disengaging from the engaging slot.

1 . A cap for a cup which has an engaging lip, wherein the cap has a cap surface and an engaging portion surrounding the cap surface, the engaging portion comprises an annular inner wall, an annular outer wall and an upper section connecting between the inner wall and the outer wall, a diameter of the inner wall substantially corresponds to an inner diameter of the engaging lip, the outer wall comprises a first section and a second section, the first section is downward extended from the upper section, and the first section has a distal end, the second section is extended from the distal end of the first section outward and downward, at least one engaging rim is formed between the first and second sections inward;
 wherein a distance between the first section and the inner wall equals to a thickness of the engaging lip, an annular engaging slot is defined between the inner wall, the first section and the upper section for the engaging lip to engage therewith;   wherein a distance between the engaging rim and the inner wall is smaller than the thickness of the engaging lip so as to prevent the engaging lip from disengaging from the engaging slot while the cap is capped on the cup.   
     
     
         2 . The cap of  claim 1 , wherein the engaging rim is annularly formed between the first and second sections. 
     
     
         3 . The cap of  claim 1 , wherein a plurality of engaging rims are formed between the first and second sections, the engaging rims are arranged discontinuously around the engaging slot. 
     
     
         4 . The cap of  claim 1 , wherein a distance between the engaging rim and the upper section equals to a height of the engaging lip. 
     
     
         5 . The cap of  claim 1 , wherein a largest diameter of the second section is bigger than that of the engaging lip, so that the engaging lip can be guided by the second section when the engaging lip is to engage with the engaging slot.