CURRENT LEAD SECTION TO THE ELECTRIC DRILL Russian patent published in 2018 - IPC E21B17/02 

FIELD: drilling of soil or rock.

SUBSTANCE: invention relates to the electric drills, namely to the drill pipes, which are equipped with a cable line. Section of the current lead to the electric drill includes a drill pipe with a coupling and a nipple and an inner tube, which is placed in it, with an annular gap of wear-resistant material, one end of which is fixed in the coupling with a transit block and the other one in the nipple by means of a mandrel. In the annular gap, a cable with end-connected conductor rings is installed, which are mounted in the contact bushing from the side of the nipple and into the contact tip on the coupling side, the contact coupling is inserted into the sleeve, and the contact tip is inserted into the mandrel. Cable is wound around the inner tube near the contact coupling.

EFFECT: increased reliability of the current lead section to the electric drill.

1 cl, 2 dwg