DRILLING DEVICE WITH ADJUSTABLE SKEWING ANGLE Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: device is intended for drilling skewed sections of holes by bottom-hole motors with the help of units ensuring required skewing. Device has upper adapter, barrel which is centered in adapter according to cylindrical surfaces, rim which is engaged with barrel and clamped over flat ends located at angle to each other. Rim is located between upper adapter and lower adapter and connected by means of threaded joint of lower adapter with barrel provided with thrust member for interaction with upper adapter. Axis of thread O₁-O₁ of which crosses axis O₂-O₂ of cylindrical surfaces, which in its turn crosses axis O₃-O₃ of connecting thread of lower adapter. Due to connection of tooth joints and rim respectively with upper adapter and barrel and ensuring coaxial relation of threads and lower adapter, achieved is required tightening of threaded joint and monolithic structure. In optimal version, all aforesaid axes are crossing at point O lying in plane of contact of upper adapter and rim. EFFECT: high efficiency. 3 cl, 2 dwg