Flexible tubing for a rotary-percussion drilling device

摘要

The tube (2) has a sealed pipe (4) or a spring at the interior, and a hydraulic hose (3) at the exterior to procure sealing and resistance to pressure for transferring hydraulic fluid to a drilling body. Connections (6) are provided at ends of the tube for transmitting thrust force and rotation torque to the drilling body. The pipe procures rigidity to transfer the force and torque. Each connection has a cylindrical insert (8) engaged inside the pipe, and an external skirt (9) placed around the hydraulic hose.