Floating cover and sealing means for liquid storage tank

Claim 1

IN COMBINATION, A FLOATING ROOF FOR A LIQUID STORAGE TANK AND A SEAL FOR SAID ROOF; SAID SEAL COMPRISING A CORE MEMBER OF RESILIENT FOAMED SYNTHETIC RESIN OR SIMILAR COMPRESSIBLE MATERIAL AND A FLEXIBLE OIL-IMPERVIOUS COVER SHEET, SAID CORE MEMBER HAVING AN ANNULAR CONFIGURATION AND IN ITS UNSTRESSED CONDITION A RADIAL CROSS-SECTION OF SUBSTANTIALLY ISOSCELES TRAPEZOIDAL SHAPE WITH THE LONGER BASE OF SUCH TRAPEZOIDAL SHAPE AT THE RADIALLY INWARD FACE OF THE CORE MEMBER, SAID CORE MEMBER HAVING A RADIALLY OUTWARDLY OPENING GROOVE OF SUBSTANTIALLY U-SHAPED RADIAL CROSS-SECTION EXTENDING CIRCUMFERENTIALLY ALONG THE OUTER FACE OF SAID MEMBER, SAID GROOVE EXTENDING RADIALLY INWARDLY FROM SAID OUTER FACE A DISTANCE AT LEAST HALF THE RADIAL DIMENSION OF THE CORE MEMBER AND BEING OF SUFFICIENT SIZE THAT BOTH PORTIONS OF THE CORE MEMBER AT THE SIDES OF THE GROOVE MAY BEND INTO THE GROOVE, SAID COVER SHEET BEING SECURELY BONDED TO THE OUTERMOST AXIALLY FACING SURFACES OF THE CORE MEMBER WITH THE LONGITUDINALLY EXTENDING MID-PORTION OF SAID SHEET SPANNING THE OPENING OF THE CORE MEMBER GROOVE IN SUBTANTIALLY PARALLEL RELATIONSHIP TO THE RADIALLY INNERMOST FACE OF THE CORE MEMBER, SAID COVER SHEET AND CORE MEMBER BEING SEALINGLY SECURED TO THE PERIPHERY OF SAID FLOATING ROOF RESPECTIVELY AT THE UPPER AND LOWER EDGE PORTIONS OF THE COVER SHEET AND AT THE SAID RADIALLY INTERMOST FACE OF THE CORE MEMBER.