Patent ID: 7318334

Claim:
A powered pipe flaring tool comprising: a cylinder with a cylinder bore, a cylinder top end and a cylinder bottom end; a piston slidably mounted in the cylinder; a compression spring mounted in the cylinder and urging the piston toward the cylinder top end; a top end plug mounted on the cylinder top end, a plug central bore passing through the top end plug and including a crimped cartridge bore portion that is coaxial with the cylinder bore; a conical male pipe flaring surface on a piston lower end; a gas primary expansion chamber in an upper axial bore of the plug central bore adjacent to the crimped cartridge bore portion, a gas inner expansion chamber inside the piston, and a gas head end expansion chamber in the cylinder and between the top end plug and a piston upper end; a valve seat inside the plug central bore in the top end plug that cooperates with a piston pin on the piston to control gas flow from the gas primary chamber and into the gas inner expansion chamber; a cylinder plug bottom surface that cooperates with a piston upper end to control gas flow from the gas inner expansion chamber and into the gas head end expansion chamber; a bolt and firing pin assembly attached to the cylinder top end; a pipe clamp assembly with a pipe passage surrounded by a female flaring surface that is axially fixed relative to the cylinder and wherein the female flaring surface is in axial alignment with the conical pipe male flaring surface; and wherein the piston pin moves away from the valve seat and the piston upper end simultaneously moves away from the cylinder plug bottom surface upon gas pressure in the gas primary expansion chamber moving the piston away from the cylinder top end.