ABOVE-BIT LUBRICATOR Russian patent published in 2007 - IPC E21B10/24 

FIELD: drilling equipment, particularly lubricators to lubricate cone bit bearing structures during well drilling.

SUBSTANCE: lubricator comprises body with central channel, lubricant vessel, lubricant delivery means, which supplies lubricant to cone bit bearing structure cavities, and circulation channels, to provide lubricant circulation from the vessel to cone bit bearing structure cavities. Lubricant delivery means is made as screw pump parallel to axis of reservoir central channel and isolated from flushing fluid ingress by means of moving part seals. The screw is brought into rotation by friction transmission from freely arranged bush provided with turbine fixed in axial bush channel.

EFFECT: increased operational reliability.

1 dwg