Patent ID: 7621202

Claim:
A power tong to grip and rotate a first tubular relative to a second tubular, comprising: a gear housing; a rotary gear rotatably received within the gear housing and rotatable within a plane about an axis, the rotary gear comprising teeth to engage at least one drive gear, a first cam surface disposed within an interior of the rotary gear disposed about the axis; and a replacement cage assembly comprising: a rotary gear insert comprising a radially outwardly disposed surface, having a periphery exceeding about 180 degrees, received within the interior of the rotary gear, the rotary gear insert having a second cam surface disposed within the interior of the rotary gear insert; at least one gripping jaw pivotally disposed within the interior of the rotary gear insert; wherein the second cam surface engages and displaces the at least one gripping jaw inwardly to grip and rotate the first tubular relative to the second tubular; and wherein a torque is transferred from the at least one drive gear to the rotary gear through the teeth, and the torque is transferred from the rotary gear to the rotary gear insert at an interface between the radially outwardly disposed surface of the rotary gear insert and the interior of the rotary gear.