Patent ID: 8775100

Claim:
A heat tube inspection cable comprising: a sensor unit configured to detect a defect in a heat tube; a plurality of segment units each configured to comprise a body part and a wheel part rotatably connected to the body part, wherein the body part of each of the plurality of segment units comprises: a cable insertion part helically formed on an outer circumference of the body part of each of the plurality of segment units, and a wire through hole formed through an inner part of the body part of each of the plurality of segment units; a signal cable configured to be inserted in the cable insertion parts and to helically pass through the body part of each of the plurality of segment units to transmit electric signal from the sensor unit; and a wire configured to be inserted in the wire through holes and to pass through the body part of each of the plurality of segment units to keep the linear configuration of the plurality of segment units like a bead necklace and to provide axial and bending strength.