Aircraft fuel tank closure cap

Claim 1

A closure cap assembly for an aircraft fuel tank provided with a filling opening and an adapter ring with a lower flange having spaced slots therein, secured within said opening, said assembly including a closure cap having a central opening therein, an annular flange on the lower face of the cap and having an annular slot outside the flange, a sealing ring received in said slot, a retaining ring for the sealing ring secured to said flange and provided on its lower face with an annular flange of relatively shallow depth and with deeper sections forming stops, a round generally cup shaped clamping member with spaced jaws around its periphery, a shaft at its center rotatably received in the cap opening, an enlarged centrally disposed hub section with the shaft extending upwardly from said hub section, lugs extending from the clamping member which can be aligned with the adapter slots, ribs extending from said hub section to the outer wall of the clamping member to reinforce the same, the closure cap, the sealing ring, the retaining ring and the clamping member, including the shaft, being formed from plastic insulting material.