Fill cap fastening means

Claim 1

A COVER ASSEMBLY FOR CLOSING AN OPENING DEFINED BY A CYLINDRICAL COLLAR HAVING A REVERSED TURNED END FLANGE COMPRISING: (A) CIRCULAR CLOSURE MEMBER ENGAGEABLE WITH THE REVERSED TURNED END FLANGE FOR CLOSING THE OPENING, (B) A STRONG ARM HAVING AN ELONGATED MEMBER POSITIONED DIAMETRICALLY OVER THE CLOSURE MEMBER, SAID MEMBER HAVING A FLAT END SECTION TERMINATING IN AN INWARDLY CURVED LIP AND SIDE FLANGES SECURED TO THE SIDES OF THE ELONGATED MEMBER AND PROJECTED TOWARD THE CLOSURE MEMBER, (C) FIRST LUG MEMBERS SECURED TO THE CYLINDRICAL COLLAR AND PROJECTED UPWARDLY ADJACENT THE SIDE FLANGES, (D) FIRST MEANS PIVOTALLY CONNECTING THE FIRST LUG MEMBERS AND THE FLANGES WHEREBY THE STRONG ARM HAS ANGULAR MOVEMENT TOWARD AND AWAY FROM SAID COLLAR IN THE PLANE OF THE STRONG ARM, (E) UNIVERSAL JOINT MEANS PIVOTALLY CONNECTING THE MIDPORTION OF THE ELONGATED MEMBER TO THE CENTER OF THE CLOSURE MEMBER, (F) A LOCK ARM FOR HOLDING THE STRONG ARM AND CLOSURE MEMBER IN A CLOSED POSITION RELATIVE TO THE OPENING, SAID LOCK ARM HAVING A PLATE AND OUTWARDLY PROJECTED FLANGES SECURED TO THE OPPOSITE SIDES OF ONE END OF THE PLATE, (G) SECOND LUG MEMBERS SECURED TO THE COLLAR OPPOSITE THE FIRST LUG MEMBERS, SAID SECOND LUG MEMBERS PROJECTED UPWARDLY ADJACENT THE FLANGES OF THE LOCK ARM, (H) SECOND MEANS PIVOTALLY CONNECTING THE LOCK ARM FLANGES WITH THE SECOND LUG MEMBERS WHEREBY THE LOCK ARM HAS ANGULAR MOVEMENT TOWARD AND AWAY FROM THE STRONG ARM, AND (I) AN ELONGAGED ROLLER ROTATABLY MOUNTED ON SAID FLANGES OF THE LOCK ARM ON AN AXIS PARALLEL TO AND ABOVE THE AXIS OF THE SECOND PIVOT MEANS, SAID ROLLER MEANS ON ANGULAR MOVEMENT OF THE LOCK ARM TOWARD THE STRONG ARM ENGAGES THE CURVED LIP AND MOVES UP ONTO THE FLAT END SECTION OF THE STRONG ARM FORCING AND HOLDINT THE STRONG ARM AND CLOSURE MEMBER IN THE CLOSED POSITION.