Patent ID: 7806638

Claim:
In a reinstatement cutting machine of the type having an elongated metal body movable through a pipe to be reinstated, said elongated metal body having a longitudinal axis, a rear-most end and a forward-most end, a cutting head mounted to the forward-most end of said elongated metal body, said cutting head including a cutting bit for cutting the pipe and an air-driven motor for driving the cutting bit, the improvement in the reinstatement cutting machine comprising: an elongated bore formed through the elongated metal body from the rear-most end to the forward-most end thereof so that said elongated bore has a length substantially the same length as said elongated metal body; an elongated insulator for insulating the elongated bore to reduce temperature changes in the elongated metal body as a result of the air carried through the elongated insulator, said elongated insulator for carrying pressurized air through the elongated metal body of said reinstatement cutting machine; and a motor for moving said cutting head axially with respect to the longitudinal axis of the elongated metal body of said reinstatement cutting machine, said motor located within said elongated metal body and outside of said elongated bore formed through the elongated metal body.