Patent ID: 7836741

Claim:
An expansion member for a rotary expansion tool, the expansion member comprising: a carrier; a spindle adapted to be supported at both ends in the carrier, wherein the spindle and carrier define corresponding profiles to provide for radial restraint of the spindle relative to the carrier; a roller mounted concentrically on the spindle, wherein the carrier, the spindle and the roller are configured to be movable as a unit in the rotary expansion tool between a retracted position and an extended position; a sealed lubrication system having a lubricant reservoir, wherein the sealed lubrication system is contained within the spindle for supplying lubricant to at least one of a portion of at least one bearing or a bearing surface located at an interface between the spindle and the roller; and a first seal member and a second seal member disposed on opposite sides of the at least one bearing or the bearing surface.