Patent ID: 8066064

Claim:
A wellhead assembly, comprising: a wellhead housing having an inner surface profile and a retractable member disposed within the wellhead housing; and a casing hanger, comprising: a hollow body; an activation member; and a load member adapted to support the casing hanger by being driven outward into engagement with the inner surface profile of the wellhead housing, wherein a process for driving the load member outward is triggered by engagement of the activation member with the retractable member, wherein the casing hanger and the activation ring are adapted so that the casing hanger applies an upward force on the activation member as a lifting force is applied to the casing hanger after the load member is driven outward into engagement with the inner surface profile of the wellhead housing, and wherein the casing hanger comprises a first protrusion and the activation member comprises a second protrusion disposed on a cantilever arm, wherein the first protrusion is oriented above the second protrusion when the casing hanger is disposed initially into the wellhead, further wherein the cantilever arm deflects to enable the second protrusion to pass by the first protrusion as the casing hanger is lowered into the wellhead after downward movement of the activation member is blocked by the retractable member.