To provide a cap that is of simple structure and allows handling by a simple operation and easy separate-treating from a bottle body.
The cap comprises a cap body 2 having an installed cylinder 3a provided, on the lower end inner circumferential surface thereof, with an engaging protruding bar 4a therearound to be engaged with an engaging circumferential bar provided on the outer circumferential surface of an opening part of the bottle mouth cylinder, and an outer cap body 14 having a cylindrical form with top, provided with an outside-installed cylinder 19 that is installed, in contact, outside the installed cylinder under the condition of an out-pouring mouth closed, which is removably screw-installed on the cap body 2 capable of opening and closing the out-pouring mouth. It is so arranged that the strength with which the outer cap body 14 is to be fastened is set to such an extent that, it is not disengaged by the force of the content liquid in the water-hammer state, with the lowest end part of the outside-installed cylinder 19 being located at a position higher than at least the position of the engaging protruding bar 4a, and the outer cap body can be removed by a human hand, as it is held thereby, in a wrenching off manner while the outer cap body is maintained in a screw-connected state.
ABE TAKAYUKI
GOTO TAKAYUKI
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