Securing structure for container closure

A high pressure container assembly configured to hold a high pressure fluid, the container assembly including:

• a container configured to hold the high pressure fluid;
• a container port on the container and configured to allow the high pressure fluid to pass into or out of the container, wherein the container port includes a collar surrounding the port and extending outward from the container;
• a securing structure configured to close the closure port and prevent leakage of the high pressure fluid from the container through the container port, wherein the securing structure is seated in the container port and engages an inner wall of the collar;
• an external ring extending around the container port, wherein the external ring has an opening having a wider diameter than the outer diameter of the collar of the container port and the external ring includes an annular abutment surface
• a retaining ring configured to be placed within the external ring and to be placed radially between the container port and the external ring, wherein the retaining ring comprises:
• an annular external main body extending around the container port and including:
• an outer cylindrical surface abutting an inner cylindrical surface of the external ring,
• an annular inner frustoconical surface, and
• an end abutting the annular abutment surface of the external ring, and
• an annular internal wedge element including an annular inner surface extending around and abutting a cylindrical outer surface of the collar of the container port and an annular outer frustoconical surface in sliding contact with the annular inner frustoconical surface of the annular external main body, wherein the annular internal wedge element is sandwiched between the annular external main body and the collar of the container port, wherein a thickness of the annular internal wedge element reduces in a direction towards the container;
• a retaining plate covering the securing structure in the container port and separated by a gap between a distal end of the securing structure and the retaining plate;
• and
• anchoring elements securing the retaining plate to the external ring.