Assembled container cap

1. A container cap assembly comprising:

an inner cap comprising an outer wall portion configured to closely correspond to an inner surface of a neck of a container and a flange portion extending outward from an upper end of the outer wall portion, the flange portion being configured to closely correspond to an upper end of the neck; and

an outer cap comprising a ceiling to cover an upper portion of the inner cap and a side wall portion configured to cover an outer circumferential surface of the neck, the ceiling and the side wall portion being integrally formed, wherein:

the side wall portion is provided, at an inner circumferential surface thereof, with female threads configured to correspond to male threads formed at the outer circumferential surface of the neck,

the inner cap is configured such that an outer edge portion of the flange portion protrudes from the outer wall portion by equal to or greater than a sum of a thickness of the neck and a height of the male threads,

the outer cap is provided, at an upper portion of an inner circumferential surface thereof, a protrusion away from a lower surface of the ceiling by a distance allowing the flange portion to be inserted and protruding along a circumference thereof to a position proximate to the outer circumferential surface of the neck, and

the inner cap and the outer cap are coupled to each other such that the outer edge portion of the flange portion is inserted between the lower surface of the ceiling of the outer cap and the protrusion,

wherein the inner cap comprises a support plate extending from a lower end portion of the outer wall portion and having a plate shape, a lower surface of the support plate by the outer wall portion is positioned farther, based on a ceiling surface of the outer cap, than a position of a lower end of the side wall portion of the outer cap, and the support plate is provided, at an upper surface thereof, with a boss comprising a magnet therein, and

wherein the boss is formed at a position contacting the lower surface of the ceiling of the outer cap and has a rib on an inner side thereof at a half position in a height direction, and the magnet is forcibly inserted into at least an upper side of upper and lower sides of the boss.

2. The container cap assembly of claim 1 , wherein:

the outer cap includes a synthetic resin material,

the protrusion is integrally formed annularly along the inner circumferential surface of the outer cap, and

the inner cap and the outer cap are coupled by an elastic restoration force of the inner cap such that the flange portion is forcibly inserted between the lower surface of the ceiling of the outer cap and an upper surface of the protrusion.

3. The container cap assembly of claim 2 , wherein the flange portion is further provided, at a lower surface thereof, with an annular insertion projection pressed on an upper surface of the neck or inserted between an end portion of an inner side of the protrusion and an outer edge of the upper surface of the neck at least one portion of the upper surface and an edge portion of an upper end of the neck along a circumference of the flange portion.

4. The container cap assembly of claim 1 , wherein:

the outer cap comprises a metal plate material, and

the protrusion is inwardly pressed along an outer circumferential surface of the outer cap.

5. The container cap assembly of claim 4 , wherein the protrusion is configured in plural such that the protrusions are arranged along the outer circumferential surface of the outer cap with intervals therebetween.

6. The container cap assembly of claim 5 , wherein:

an upper side of the protrusions is pressed from an outer side to an inner side of the outer cap to be cut so as to support an edge portion of a lower surface of the flange portion, and

at least a lower side of opposite and lower sides of the protrusions has a bent shape according to partial pressing of a side wall of the outer cap.

7. The container cap assembly of claim 6 , wherein the flange portion is further provided, at a lower surface thereof, with an annular insertion projection pressed on an upper surface of the neck or inserted between an end portion of an inner side of the protrusion and an outer edge of the upper surface of the neck at least one portion of the upper surface and an edge portion of an upper end of the neck along a circumference of the flange portion.

8. The container cap assembly of claim 5 , wherein the flange portion is further provided, at a lower surface thereof, with an annular insertion projection pressed on an upper surface of the neck or inserted between an end portion of an inner side of the protrusion and an outer edge of the upper surface of the neck at least one portion of the upper surface and an edge portion of an upper end of the neck along a circumference of the flange portion.

9. The container cap assembly of claim 4 , wherein the flange portion is further provided, at a lower surface thereof, with an annular insertion projection pressed on an upper surface of the neck or inserted between an end portion of an inner side of the protrusion and an outer edge of the upper surface of the neck at least one portion of the upper surface and an edge portion of an upper end of the neck along a circumference of the flange portion.

10. The container cap assembly of claim 1 , wherein the flange portion is further provided, at a lower surface thereof, with an annular insertion projection pressed on an upper surface of the neck or inserted between an end portion of an inner side of the protrusion and an outer edge of the upper surface of the neck at least one portion of the upper surface and an edge portion of an upper end of the neck along a circumference of the flange portion.