Patent ID: 7243685

Claim:
A closure to sealingly enclose a port in a vessel, comprising: a hub having a bore that defines a hub central axis for fluid communication with the port, a hub thread secured to the hub and generally centered about the hub central axis, a proximate end for sealing to the vessel about the port, and a distal end axially opposite the proximate end; a door movable within the bore of the hub; a shoulder within the hub for seating with the door; a seal circumferentially sealing between the door and the hub when the door is seated with the shoulder; a locking ring having a ring central axis and a ring thread generally centered about the ring central axis, the ring thread engageable with the hub thread, the locking ring rotatable relative to and axially engageable with the door for moving the door to a closed position against the shoulder upon rotation of the locking ring about the ring central axis; and at least one rotatable actuator element engaging the locking ring and rotatable about an axis of rotation spaced from the ring central axis such that rotation of the actuator element rotates the locking ring.