| 摘要 |
A ceramic cover (1) has a metal bottom (3) equipped with a support (9) with a pin (12) with a very broad spiral threading (13) on its lower part; said pin is held in hole (11) on the top (10) of support (9) with considerable slack. The peripheral edge (5) of the bottom holds a rubber ring (4), which is concave on the inside (2) and grooved (4') on the external surface, with a protruding molding (7) for the cover (1) to rest on. The upper part (14) of pin (12) is knurled to ensure its adhesion with glue to the ceramic handle (16). Even though the ceramic pieces are rounded, the seal is hermetic as well as aesthetically pleasing, since no non-ceramic part is visible. Opening and closing are rapid, requiring only 3/4 of a turn (FIG. 2).
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