Patent ID: 8171996

Claim:
A wellhead assembly, comprising: a wellhead having a bore extending therethrough, the bore having a first profile region; and a tubular hanger adapted to secure to the wellhead, the tubular hanger comprising: a tubular hanger body; a first expandable member carried on the tubular hanger body and adapted to expand outward to engage the first profile region of the wellhead, the first expandable member having a first angled surface; and a moveable member carried on the tubular hanger body, the moveable member having a second angled surface facing the first angled surface of the first expandable member; a threaded ring that is threaded to the tubular hanger body, wherein the moveable member is driven axially relative to the first expandable member by the threaded ring as the threaded ring is rotated relative to the tubular hanger body; and wherein the first angled surface and second angled surface are adapted to cooperate to produce a mechanical advantage to drive the first expandable member outward and the moveable member inward to wedge the moveable member between the first expandable member and the tubular hanger body as the moveable member is driven by the threaded ring against the first expandable member.