ABOVE-BIT LUBRICATOR Russian patent published in 1996 - IPC

FIELD: rolling cutter drilling tools for well drilling, particular, devices for lubricating bearings of bit roller cutter. SUBSTANCE: above-bit lubricator has differential dosing device 5 furnished with additional valve 46 and eccentric washer 38. Valves 13 and 46 are made in form of movable rods with recesses on side surface. Valve 46 has eccentric spring-loaded clamp 53. Rod 29 is made in form of hollow stepped piston with annular recess to receive projection of valve 13. Spring 34 is installed in its hollow between its bottom and stop 35. Washer 38 is mounted on axle of stop 35. Valve 13 may be located in pipe union 8 on wall 10. Reservoir 3 may have partition to form hollow 58. Valve 61 is located on partition and spring-loaded in pipe union 8 and has axial channel and valve. Installed on partition 63, which forms air hollow 58, is transducer 64 of lubricant presence. EFFECT: higher efficiency. 4 cl, 3 dwg