Cap assembly and method for assembling same

Abstract

The invention relates to a cap assembly which is put over a mouth of a bottle, and an assembly method thereof, and provides a cap assembly which prevents an occurrence of misunderstanding when opening a cap initially and has good usability, and a method for assembling thereof. There are included an inner stopper and a cap, and the inner stopper and the cap are assembled in a state in which a lid section is received in a receiving section and a protrusion section is positioned below the lid section, and the lid section is arranged at a position which is inside the receiving section and has a space between an inner surface of a shell section and the lid section, so that an occurrence of misunderstanding by torque changing before the inner stopper is opened is prevented.

1 . A cap assembly comprising:
 an inner stopper that is put over a mouth of a bottle to close the mouth; and   a cap that is put over the mouth such that the cap covers the inner stopper, wherein   the inner stopper comprises:   a main body that includes a hollow section which has a hollow shape having an upper opening and a lower opening and communicating with the mouth of the bottle, and whose lower end section is inserted to the mouth of the bottle, and a holding section which holds an upper end section of the bottle in cooperation with the lower end section of the hollow section after the insertion has been executed; and   a lid body that includes a lid section which spreads above the hollow section such that the lid section covers the hollow section, and a junction section which is junctioned circumferentially to an upper end edge of the hollow section and closes an opening on an upper end of the hollow section together with the lid section, and that is a component integrated with the main body, closes the mouth of the bottle together with the main body, and receives pressing from above to have the junction section broken so as to become a part separate from the main body,   the cap comprises:   a shell section that is formed to be hollow while opening downward and is put over the mouth of the bottle while covering the inner stopper;   a receiving section that protrudes downward from an inner side upper surface of the shell section, has a lower opening section, and receives the lid section in an inside to surround an edge of the lid section; and   a protrusion section that protrudes inward from an inner circumference surface of the receiving section, interferes with the edge of the lid section to cause the lid section to expand the receiving section when the cap and the inner stopper are assembled, causes the receiving section to return to an original shape when the lid section comes to a side of an upper surface of the shell section so as to be positioned below the lid section, and supports the lid section after the junction section is broken, and   the cap is coupled with the inner stopper in a state in which the cap receives the lid section in the receiving section, the protrusion section is positioned below the lid section, and the lid section is arranged at a position which is inside the receiving section and has a space between the lid section and the inner surface of the shell section.   
     
     
         2 . The cap assembly according to  claim 1 , wherein
 the inner stopper includes a screw thread which circles helically on an outer circumference surface of the hollow section, and   the cap includes a screwing section which protrudes in a cylindrical shape and downward from the inner side upper surface of the shell section, and has a lower opening section, and on whose inner circumference surface a screw thread to be screwed to the screw thread of the inner stopper is formed.   
     
     
         3 . The cap assembly according to  claim 1 , wherein the cap includes on an inner surface of the shell section a screw thread to be screwed to a screw thread formed in the bottle. 
     
     
         4 . The cap assembly according to  claim 1 , wherein an upper end surface surrounding the upper opening and being oriented upward of the hollow section has a gradient rising outward. 
     
     
         5 . A method for assembling of assembling a cap assembly, wherein,
 the cap assembly comprises:   an inner stopper that is put over a mouth of a bottle to close the mouth; and   a cap that is put over the mouth such that the cap covers the inner stopper,   the inner stopper comprises:   a main body that includes a hollow section which has a hollow shape having an upper opening and a lower opening and communicating with the mouth of the bottle, and whose lower end section is inserted to the mouth of the bottle, and a holding section which holds an upper end section of the bottle in cooperation with the lower end section of the hollow section after the insertion has been executed; and   a lid body that includes a lid section which spreads above the hollow section such that the lid section covers the hollow section, and a junction section which is junctioned circumferentially to an upper end edge of the hollow section and closes an opening on an upper end of the hollow section together with the lid section, and that is a component integrated with the main body, closes the mouth of the bottle together with the main body, and receives pressing from above to have the junction section broken so as to become a part separate from the main body,   the cap comprises:   a shell section that is formed to be hollow while opening downward and is put over the mouth of the bottle while covering the inner stopper;   a receiving section that protrudes downward from an inner side upper surface of the shell section, has a lower opening section, and receives the lid section in an inside to surround an edge of the lid section; and   a protrusion section that protrudes inward from an inner circumference surface of the receiving section, interferes with the edge of the lid section to cause the lid section to expand the receiving section when the cap and the inner stopper are assembled, causes the receiving section to return to an original shape when the lid section comes to a side of an upper surface of the shell section so as to be positioned below the lid section, and supports the lid section after the junction section is broken, and   the method for assembling is a method for assembling of assembling the inner stopper and the cap, and the method for assembling comprises:   putting the cap over the inner stopper, and causing the receiving section to receive the lid section up to a position in which the protrusion section goes beyond the lid section to be positioned below the lid section and the space between the lid section and the inner surface of the shell section becomes relatively narrow; and   moving the cap upward relatively to the inner stopper in a range in which a state in which the protrusion section is positioned below the lid section is maintained, so as to expand the space between the lid section and the inner surface of the shell section.