DRILL COLLAR LUBRICATOR Russian patent published in 1994 - IPC

FIELD: drilling technique. SUBSTANCE: lubricator includes hollow case having a lubricant tank connected through axial channels to drilling bit rolling cutter bearing assembly chamber. There are a filling assembly and a differential dosing device disposed between the tank and the drilling bit. The differential dosing device has an adjusting stop member with an axle, a movable rod, a spring located between them, and two valves made in the form of rods having grooves on their external surfaces, all disposed within one chamber. As the lubricant is supplied, the grooves are aligned with the case axial channels. One valve is mounted for interaction with the rod, another - with the adjusting stop member through an eccentric washer and a spring-actuated clamp attached to a rod end. EFFECT: enlarged operating capabilities. 5 dwg, 1 tbl