| 摘要 |
PURPOSE:To make a bottom cap difficult to separate from a container body and fully airtight in use by providing a first projection formed on the inner peripheral surface on the opening side of the bottom cap and engageable with an annular stepped part on the outer peripheral surface of a liquid filling opening part and a second projection formed on the inner peripheral surface of a lid and movable from the annular stepped part to face to or contact with the outer peripheral surface on the opening side of the liquid filling opening part. CONSTITUTION:When a bottom cap 21 is placed over a liquid filling opening part 14 and depressed, a first projection 25 is slidably moved along a taper guide part 15a, a cap opening 28 is widened and the first projection 25 is extended over an annular stepped part 15 and then moved back into engagement with a locking part 15. In this condition, the first projection 15 is brought into contact with the outer peripheral surface 16 on the base side of the liquid filling opening part 14, while a second projection 26 is moved away from the outer peripheral surface 17 on the forward end side of the liquid filling opening part 14. When the inner pressure of a liquid reservoir 12 is increased, the bottom cap 21 is deformed, the first projection 25 is disengaged from the locking part 15b and the bottom cap 21 attempts to spring out. When a side wall 24 is curved, however, the second projection 26 is strongly urged against the outer peripheral surface 17 on the forward end side to prevent disengagement of the bottom cap 21 from the liquid filling opening part 14. |
