Bottle cap

Abstract

Disclosed is a bottle cap configured to open and close a mouth of a bottle. The bottle cap is easily may be easily removed with only small force. When the bottle cap is fixed to fit a twisting groove formed at the bottle cap on an edge or corner of a supporting object such as a table and a bottle is rotated in such a way that great force is applied to the bottle cap, even a person who has a weak grip may easily remove the bottle cap with a relatively smaller force than that used with a general bottle cap. Also, the bottle cap further includes a sound generator to notify that the bottle cap has been removed by generating a sound when removing is performed at a blind spot.

What is claimed is: 
     
         1 . A bottle cap coupled to a bottle to open and close the bottle, comprising:
 a coupling portion comprising an opening formed at a bottom end thereof to enable a first fastening portion in a screw shape formed at a top of the bottle to be inserted thereinto and a second fastening portion formed therein in a screw shape to correspond to the first fastening portion to be screw-coupled with the first fastening portion; and   a twisting portion configured to extend upward from the coupling portion and comprise a twisting groove recessed downward from a top surface thereof at a top thereof.   
     
     
         2 . The bottle cap of  claim 1 , wherein the twisting groove has a triangular cross section. 
     
     
         3 . The bottle cap of  claim 1 , wherein the twisting groove has a hemispherical or curved cross section. 
     
     
         4 . The bottle cap of  claim 1 , wherein the twisting groove has a tetrahedral cross section. 
     
     
         5 . The bottle cap of  claim 2 , wherein an uneven portion is formed at a surface of the twisting groove. 
     
     
         6 . The bottle cap of  claim 2 , wherein the twisting groove further comprises an elastic pad at a surface thereof. 
     
     
         7 . The bottle cap of  claim 1 , further comprising an auxiliary coupling portion configured to extend below the coupling portion and comprise an insertion grove to enable another bottle cap to be inserted thereinto,
 wherein a plurality of holding protrusions configured to extend upward and be spaced apart from each other in a circumferential direction are formed at the insertion groove of the auxiliary coupling portion, and   wherein holding grooves configured to extend upward and downward and be spaced apart from each other in the circumferential direction to correspond to the holding grooves are formed at outer circumferential surfaces of the coupling portion and the twisting portion.   
     
     
         8 . The bottle cap of  claim 1 , further comprising a sound generator installed at a top of an inside of the coupling portion for notifying whether the bottle cap has been removed,
 wherein the sound generator is installed to be in close contact with an a top surface of the inside of the coupling portion, has elasticity, and comprises a flow channel formed along an edge thereof to enable air to be suctioned through a gap from the internal top surface of the coupling portion and a connecting groove connected to the flow channel at one side thereof.   
     
     
         9 . The bottle cap of  claim 1 , wherein the coupling portion and the twisting portion are formed to be mutually couplable and separable,
 wherein the twisting portion comprises an insertion groove therein to enable the coupling portion to be inserted thereinto,   wherein a plurality of holding protrusions configured to extend upward and downward and be spaced apart from each other in a circumferential direction are formed at an outer circumferential surface of the coupling portion, and   wherein a plurality of holding grooves configured to extend upward and downward in the circumferential surface to correspond to the holding protrusions are formed at an inner circumferential surface of the twisting portion.