Patent ID: 6921087

Claim:
A scaling mechanism for a vessel ( 2 ) which mechanism characterized in that: said vessel ( 2 ) and a cap ( 1 ) are provided, which vessel ( 2 ) having an opening portion ( 3 ) and which cap ( 1 ) having a plug portion ( 4 ), a seal plug ( 5 ) arid a sleeve ( 6 ), said plug portion ( 4 ) has a top board ( 11 ) to cover said opening portion ( 3 ), a side wall ( 12 ) projecting from said top board ( 11 ) along axis (X) of said plug portion ( 4 ) and the side wall ( 12 ) is directly fitted on an outer circumferential surface of said opening portion ( 3 ) of the vessel ( 2 ), and a cylindrical wall ( 15 ) forming a receiving chamber ( 14 ) having an opening mouth ( 13 ) at its under end face which wall projects from said top board ( 11 ) at inner side of said side wall ( 12 ), said seal plug ( 5 ) is to be fixed on said cylindrical wall ( 15 ) to seal said opening mouth ( 13 ) and its outer diameter (D 1 ) is larger than outer diameter (D 2 ) of said cylindrical wall ( 15 ), said sleeve ( 6 ) is loosely fitted on said cylindrical wall ( 15 ) and has a flexible sepal portion ( 16 ) on said outer circumference which portion baa outer diameter larger than inner diameter (D 3 ) of said opening portion ( 3 ) and passes said inner diameter (D 3 ) bending so as to avoid backward moving, and at relative movement of said cap ( 1 ) to said vessel ( 2 ) toward direction where they separate from each other, said seal plug ( 5 ) is separated by said sleeve ( 6 ) from said cylindrical wall ( 15 ) and said opening mouth ( 13 ) is to be opened.