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.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a bottle cap which has a raw material accommodating portion for accommodating a raw material in the form of powder or liquid and opens a lower end of the raw material accommodating portion in response to an unplugging operation to discharge the raw material into a bottle. [0003] 2. Description of the Related Art [0004] A bottle cap of the type mentioned is conventionally known and disclosed, for example, in Japanese Utility Model Publication No. S44-12957 (hereinafter referred to as Patent Document 1: particularly refer to page 1 of the specification and FIGS. 1 and 2) and Japanese Patent No. 3,281,730 (hereinafter referred to as Patent Document 2: particularly refer to page 2 of the specification and FIGS. 1 and 3). The inventor of the present invention has proposed and commercialized a bottle cap which overcomes drawbacks of the bottle caps of Patent Document 1 and Patent Document ...

AI Technical Summary

Benefits of technology

[0019] It is an object of the present invention to provide a bottle cap which can achieve similar operation to that of the conventional bottle cap described above even if the parent cap of the conventional bottle cap described hereinabove is omitted, that is, can separate, when an unplugging operation is performed, a bottom lid for a raw material accommodating portion and allow the bottom lid to be discharged into a bottle and can thereby reduce the cost and simplify the structure and operation of an automatic cap mounting apparatus for automatically mounting the bottle cap on the mouth of a bottle.

[0020] It is another object of the present invention to provide a bottle cap which can prevent a user from drinking a bottom lid thereof in error and eliminate part of a raw material from being left without being drunk which is caused by an outer tube of a parent cap thereof.

[0021] It is a further object of the present invention to provide a bottle cap wherein the sealing property of a bottom lid is enhanced and, even if pressure gas is accommodated in a raw material accommodating portion thereof, the air-tightness can be assured sufficiently.

Problems solved by technology

However, the bottle cap described above has the following problems.

(1) Since the bottle cap includes three parts of the parent cap 1, child cap 2 and bottom lid 3 and particularly the parent cap 1 has a complicated structure, a high cost is required, and also an automatic cap mounting apparatus for automatically mounting the bottle cap on the mouth of a bottle is complicated in structure and operation.

However, even where such instructions are given, it actually has occurred that a user forcibly removes the parent cap 1 from the mouth of the bottle and holds the mouth of the bottle, from which the parent cap 1 has been removed, in the mouth thereof to drink the raw material 11, whereupon the user drinks the bottom lid 3 in error.

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