Patent ID: 8157922

Claim:
An apparatus for processing an inside of a vertical pipe, comprising: two traveling drive units having a traveling wheel which is configured to be movable in a circumferential direction of the pipe in contact with the inside of the pipe; a working device disposed to at least one of the traveling drive units for processing an inside of pipe; a rotation support mechanism rotatably disposed to each of the traveling drive units; a coupling mechanism for swingably coupling the two traveling drive units, respectively, through the rotation support mechanism, the coupling mechanism having such a length that a relative distance between the contact points of the two traveling drive units is larger than the inner diameter of the vertical pipe; and two suspension devices connected to the rotation support mechanism of one of the traveling drive units and to the rotation support mechanism of the other of the traveling drive units, wherein the two traveling drive units are inserted into the inside of the pipe, and the working device is moved along the inside of the pipe by the two traveling drive units.