Patent ID: 7850214

Claim:
A closure assembly for a pressure vessel that have first and second members, the second member pivotally moved between an open and a closed position with respect to the first member; the assembly comprising: a primary locking assembly mounted to the first member, the primary locking assembly comprises a plurality of mounting bracket, each mounting a cam handle having a swinging bolt with a locking member; a secondary locking assembly mounted to the second member, the secondary locking assembly comprising a plurality of holding member that receives a respective locking member to lock and secure the second member to the first member; a closure safety interlock assembly mounted over the second member, the closure safety interlock assembly comprising a rotational hub having a plurality of blocking members, each blocking member having a tab end, and a mounting assembly to mount the hub to the second member, each blocking member having a visible indicia; wherein, when the second member is moved to contact the first member, each locking bolt is pivoted to interlock with a respective holding member and the hub is rotated so that each tab end overlap a respective holding member/locking member connection; wherein, to move the second member away from the first member, the hub is rotated so as to move away from the holding member/locking member connection and the indicia will indicate the sequence that should be follow to move each locking member out of engagement from their respective holding member.