PULSATING JARRING TOOL

摘要

A rotary device imposes torque in a first direction for a first period of time causing a screw to exert force in a compression direction, causing a spring to compress. The rotary device does not impose torque for a second period of time, causing the spring to decompress at the beginning of the second period of time, causing the screw to move in a decompression direction opposite the compression direction. The rotary device imposes torque in a second direction opposite the first direction for a third period of time causing the screw to exert force in the decompression direction.