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Abstract

The present invention relates to a bottle cap comprising: an insertion part configured to be fitted into the inner circumference of the slider for blocking the inner circumference of the slider; a sealing ring configured to be extended at a lateral side of a lower end of the insertion part for sealing the lower end of the slider; an extension pipe configured to be extended to the lower side of the sealing ring and having at least one shrinkage inducing groove cut lengthwise on the extension pipe such that a diameter of the extension pipe is decreased by an outside pressing force; and a hook protruding from the outer side of the extension pipe in an outward direction from the extension pipe so as to be engaged with the bottom surface of a locking protrusion on the inner circumferential side of the end portion of the inner cap.

1 . A bottle cap comprising: a storage member, which represents a lower cap, having a discharge port disposed at a lateral side of a lower end of a tube shaped inner cap that is available to be placed inside a mouth of a bottle; an opening member, which represents an upper cap, provided with a slider configured to be guided into an inner circumference of the inner cap and serving as an additive container; and a bottom cap configured to block a lower end of the slider and is able to be separated from the slider when the upper cap is detached, wherein the bottom cap comprises:
 an insertion part  556  configured to be fitted into an inner circumferential end of the slider  536  for blocking an inner circumference of the slider  536 ;   a sealing ring  551  configured to be extended at a lateral side of an end portion of the insertion part  556  for sealing the lower end of the slider  536 ; and   an extension pipe  557  configured to be extended to a lower side of the sealing ring  551  and having at least one shrinkage inducing groove  554  cut lengthwise on the extension pipe  557  such that a diameter of the extension pipe  557  is decreased by an outside pressing force; and   a hook  553  protruding at an outer side of the extension pipe  557  in a radial outward direction of the extension pipe  557  so as to be engaged with a bottom surface of a locking protrusion  526   b  that is protruded at an inner circumference side of an end portion of the inner cap  526  toward a center portion of the inner cap  526 .   
     
     
         2 . The bottle cap of  claim 1 , further comprising:
 a subsidiary locking protrusion  526   c  formed at a lower side of the locking protrusion  526   b  of the inner cap  526 ; and   a subsidiary hook  555  formed on the extension pipe  557  so as to increase the fixing force while being engaged with the subsidiary locking protrusion  526   c.      
     
     
         3 . The bottle cap of  claim 2 , wherein a protrusion length of the subsidiary locking protrusion  526   c  is longer than a protrusion length of the locking protrusion  526   b,  and a protrusion length of the hook  553  is longer than a protrusion length of the subsidiary hook  555 . 
     
     
         4 . The bottle cap of  claim 1  or  2 , wherein the insertion part  556  is provided at an upper end of an outer circumferential side thereof with a curved part  556   a  that is press-fitted to an inner circumference of the lower end of the slider  536 . 
     
     
         5 . The bottle cap of  claim 4 , wherein an upper surface of the insertion part  556  forms a protruding slope part  556   b  that protrudes upwards to guide the discharge of additive sideways. 
     
     
         6 . The bottle cap of  claim 1  or  2 , wherein a sealing groove  552  with a predetermined depth is formed at a portion between an upper surface of the sealing ring  551  and the insertion part  556 , and a sealing protrusion wheel  536   a  configured to be fittedly coupled to the sealing groove  552  is formed at a lower end portion of the slider  536  corresponding to the sealing groove for coupling. 
     
     
         7 . The bottle cap of  claim 1  or  2 , wherein the end portion of the inner cap  526  is provided with a bridge  528  configured to prevent the bottom cap  550  from moving downward into a body of the bottle when the bottom cap  550  fixed to the locking protrusion  526  is separated from the inner cap  526 . 
     
     
         8 . A bottle cap comprising a storage member, which represents a lower cap, having a discharge port disposed at a lateral side of a lower end of a tube shaped inner cap that is available to be placed inside a mouth of a bottle, an opening member, which represents an upper cap, provided with a slider configured to be guided into an inner circumference of the inner cap and serving as an additive container, and a bottom cap configured to block a lower end of the slider and is available to be separated from the slider when the upper cap is detached, wherein the bottom cap comprises:
 an insertion part  556  configured to be fitted into an inner circumferential end of the slider  536  for blocking the inner circumference of the slider  536 ;   a sealing ring  551  configured to be extended at a lateral side of an end portion of the insertion part  556  for sealing the lower end of the slider  536 ; and   a stopping bar  600  provided at an edge of an upper end of the insertion part  556  while slantingly protruding in a radial outward direction of the insertion part  556 .   
     
     
         9 . The bottle cap of  claim 8 , further comprising:
 an extension pipe  557  configured to be extended to a lower side of the sealing ring  551  and having at least one shrinkage inducing groove  554  cut lengthwise on the extension pipe  557  such that a diameter of the extension pipe  557  is decreased by an outside pressing force; and   a hook  553  protruding from an outer side of the extension pipe  557  in a radial outward direction of the extension pipe  557  so as to be engaged with a bottom surface of a locking protrusion  526   b  that protrudes from an inner circumference side of an end portion of the inner cap  526  toward a center portion of the inner cap  526 .   
     
     
         10 . The bottle cap of  claim 9 , wherein the end portion of the inner cap  526  is provided with a bridge  528  to prevent the bottom cap  550  from moving downward into a body of the bottle when the bottom cap  550  fixed to the locking protrusion  526  is separated from the inner cap  526 .