| 摘要 |
Destined to bottles whose neck (1) is of the revolution type and has a smooth internal surface, being constituted as from a cylindrical bushing (2) of a soft material, like, for example, rubber, with an outside diameter less than the inside diameter of the bottle neck (1), linked with what should be its external end in a perimetric flange (3) for leaning over the mouth (4) of said bottle. Inside this bushing (1), there are two rigid parts, an external part (5) likewise finishing externally in a discoidal head (6) and an inside part (9), in turn finishing internally in a trunco-conical head (10), these parts provided with a threaded neck (8) and a threaded and complementary pin (12), which permits the axial level of both parts as a whole to vary, by means of rotation in one or other direction of the discoidal head and externally (6), such that in the axial contraction of said rigid parts, the trunco-conical head (10) radially deforms the lower end of the bushing (2) against the inside surface of the bottle neck (1) causing an airtight and stable closure.
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