Bottle cap

Abstract

A bottle cap is disclosed which can be formed from a minimized number parts with a reduced cost. A bottom lid is molded integrally at a lower end of an inner tubular portion of a cap body with a cut formed therebetween and has unsealing projections formed in a projecting manner thereon. When the cap body is turned in a sealing direction to insert the inner tubular portion into a mouth of a bottle, the unsealing projections are closed by the bottle mouth and are engaged with a throat portion in the bottle when it passes the throat portion. Then, when the cap body is turned in an unsealing direction to pull out the inner tubular portion from the bottle mouth, the unsealing projections are blocked from upward movement by the throat portion, whereupon the bottom lid is separated at the cut from the lower end of the inner tubular portion and raw material in the inner tubular portion is discharged into the bottle.

1 . A bottle cap, comprising: 
 a cap body having an outer tubular portion having a threaded portion formed on an inner circumference thereof for engaging with a threaded portion on an outer circumference of a mouth of a bottle, a ceiling portion for sealing an opening of the mouth of the bottle, and an inner tubular portion extending downwardly from said ceiling portion for being inserted into the mouth of the bottle and serving as a raw material accommodating portion in which a raw material is accommodated; and    a bottom lid molded separably on said inner tubular portion for closing up a lower end of said inner tubular portion;    said bottom lid having a resiliently deformable unsealing projection which is resiliently deformed, when said cap body is turned in a sealing direction to insert said inner tubular portion into the mouth of the bottle, to allow said bottom lid to be inserted into the bottle but restores, when said unsealing projection passes a throat in the bottle, an original state is engaged with throat, whereafter, when said cap body is turned in an unsealing direction to pull out said inner tubular portion from the throat of the bottle, said bottom lid is blocked from upward movement by the throat in the bottle and is separated, as said inner tubular portion is further moved upwardly, from the lower end of said inner tubular portion, whereupon the lower end of said inner tubular portion is opened and the raw material in said inner tubular portion is discharged into the bottle.    
   
   
       2 . A bottle cap as claimed in  claim 1 , wherein said bottom lid and said inner tubular portion are formed as a unitary molded member with a cut formed therebetween such that, when said cap body is turned in the unsealing direction to pull out said inner tubular portion from the throat of the bottle, said bottom lid is separated at the cut from the lower end of said inner tubular portion.  
   
   
       3 . A bottle cap as claimed in  claim 2 , wherein a raw material entrance for said inner tubular portion is formed in said ceiling portion of said cap body and is closed up with an upper lid.  
   
   
       4 . A bottle cap as claimed in  claim 3 , wherein said upper lid is molded integrally with said cap body in such a manner as to be connected integrally to said ceiling portion of said cap body by a resiliently deformable hinge portion.  
   
   
       5 . A bottle cap as claimed in  claim 3 , wherein an upper face of said upper lid is covered with a sheet member adhered thereto together with an upper face of said ceiling portion around said upper lid.  
   
   
       6 . A bottle cap as claimed in  claim 1 , wherein said bottom lid is removably molded by deposition into the lower end of said inner tubular portion using a plastic material different from that of said inner tubular portion such that, when said cap body is turned in an unsealing direction to pull out said inner tubular portion from the throat of the bottle, said bottom lid is separated at the deposited portion from the lower end of said inner tubular portion.  
   
   
       7 . A bottle cap as claimed in  claim 6 , wherein a raw material entrance for said inner tubular portion is formed in said ceiling portion of said cap body and is closed up with an upper lid.  
   
   
       8 . A bottle cap as claimed in  claim 7 , wherein said upper lid is molded integrally with said cap body in such a manner as to be connected integrally to said ceiling portion of said cap body by a resiliently deformable hinge portion.  
   
   
       9 . A bottle cap as claimed in  claim 7 , wherein an upper face of said upper lid is covered with a sheet member adhered thereto together with an upper face of said ceiling portion around said upper lid.  
   
   
       10 . A bottle cap as claimed in  claim 1 , wherein said bottom lid is molded as a separate member from said inner tubular portion of said cap body and has formed on a circumferential edge thereof an annular recessed portion into which a lower end portion of said inner tubular portion can be force fitted in order to removably seal the lower end opening of said inner tubular portion such that, when said cap body is turned in an unsealing direction to pull out said inner tubular portion from the throat of the bottle, said bottom lid is blocked from upward movement by the throat in the bottle and said annular recessed portion is pulled out from the lower end of said inner tubular portion to separate said bottom lid from said inner tubular portion.  
   
   
       11 . A bottle cap as claimed in  claim 10 , wherein a packing of a material softer than that of said annular recessed portion is formed integrally by simultaneous molding on an inner face of said annular recessed portion of said bottom lid.  
   
   
       12 . A bottle cap as claimed in  claim 11 , wherein said packing is embedded in said annular recessed portion in such a manner as to partly project from the inner face of said annular recessed portion.  
   
   
       13 . A bottle cap as claimed in  claim 1 , wherein a plurality of resiliently deformable unsealing projections are provided on the circumferential edge of said bottom lid and individually have a pawl-like shape.  
   
   
       14 . A bottle cap as claimed in  claim 1 , wherein said resiliently deformable unsealing projection of said bottom lid has an annular shape whose outer diameter is changed by the resilient deformation.  
   
   
       15 . A bottle cap as claimed in  claim 14 , wherein a large number of teeth whose projecting height decreases toward the lower end are formed in a projection manner on an outer circumferential face of said annular unsealing projection.  
   
   
       16 . A bottle cap as claimed in  claim 1 , wherein an engaging projection is formed on the throat in the bottle for engaging with said unsealing projection of said bottom lid to block the upward movement of said bottom lid when said cap body is unsealed.  
   
   
       17 . A bottle cap as claimed in  claim 1 , wherein said cap body is molded from a hard plastic material, and a non-slip surface layer of a soft plastic material is formed integrally by simultaneous molding on an outer circumferential face of said outer tubular portion of said cap body.  
   
   
       18 . A bottle cap as claimed in  claim 17 , wherein said non-slip surface layer of the soft plastic is knurled.