CURRENT LEAD SECTION TO ELECTRIC DRILL Russian patent published in 2019 - IPC E21B17/02 

FIELD: electricity.

SUBSTANCE: invention relates to equipment used in electric arc heating, namely to sections of current lead for electric drill. Current lead section to electric drill includes drilling pipe with upper and lower nipple end, inner pipe inserted into drill pipe with annular clearance, in which cable is laid, and coupling fixed on lower nipple end. Top end of the internal pipe is fixed in the upper nipple end by means of the upper mandrel screwed into it, on which the contact tip is installed. Lower mandrel fixed in lower nipple end and enveloped by contact bushing through which branch pipe is screwed into lower mandrel is inserted into lower end of inner pipe. Cable is equipped at ends with contact rings fitted in contact bushing and contact tip.

EFFECT: technical result is simplification of design and increased reliability of current lead section to electric drill with simultaneous facilitation of their installation.

1 cl, 2 dwg