| 摘要 |
The flexible tubing ( 2 ) is designed to transmit a thrust and a rotary torque to a drill body and to supply the drill body with pressurized hydraulic fluid. This flexible tubing ( 2 ) is externally or internally composed of a hydraulic hose ( 3 ) and, internally or externally depending on the case, a stapled tube ( 4 ). It comprises, at its ends, fittings ( 6 ) suitable for transmitting the thrust and the rotary torque. Application to rotary-percussion drilling devices using a "downhole hammer" for mining work.
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