Closure cap for a liquid storing vessel

Abstract

A closure cap for a liquid storing vessel or tank which is constructed with a liquid storing tank having a liquid filling port formed in a predetermined part thereof, a mouth piece fitted in the liquid filling port and having an inwardly extending flanged part, a closure cap to be fitted in the mouth piece in the liquid filling port, a sealing member interposed between the lower surface of the closure cap and the inwardly extending flanged part of the mouth piece fitted in the liquid filling port, a ring-shaped raised part formed between the top peripheral edge of the mouth piece and the inwardly extending flanged part thereof, a ring-shaped flat plate part forming a part of the sealing member to intimately contact with the lower surface of the closure cap, a ring-shaped lip part which is integrally joined with the lower part of the ring-shaped flat plate part through a connecting part and which is intimately contacted with a downwardly inclined inner peripheral surface of the ring-shaped raised part defined between the top periphery of the mouth piece and the inwardly extending flanged part, and a ring-shaped slit defined in the inner peripheral surface of the connecting part, and between the lower surface of the flat plate part and the lip part.