Sealing structure for a liquid storage vessel having a floating head

Claim 1

A sealing structure for use in a liquid storage vessel having a floating head, said sealing structure comprising a core including an elongated inner core member of elastic material having a substantially rectangular cross section and substantially parallel inner and outer longitudinal surfaces and an elongated outer core member of elastic material having a substantially arcuate cross section projecting outwardly away from the outer longitudinal surface of the inner core member, said outer core member having substantially parallel upper and lower longitudinal ends respectively secured to the upper and lower longitudinal ends of the outer longitudinal surface of the inner core member to form a continuous cavity throughout the length of said core, said outer core member being initially formed separately from said inner core member as a substantially flat elongated strip and being thereafter forcibly deformed into a configuration having said arcuate cross section, and a flexible covering member hermetically enclosing said core therewithin and slidably pressed between the inner longitudinal surface of said inner core member and an outer peripheral surface of said floating head and partly between the projecting outer longitudinal surface of said outer core member and an inner peripheral surface of said liquid storage vessel.