Installation and removal of top drive units

摘要

The invention features an assembly for use with a drilling rig having a mast and a first torque guide section mounted to the mast. The first torque guide section has an end and a coupler mounted near the end. The assembly includes a second torque guide section and a fastener mounted to the second torque guide section. The fastener is configured to form a releasable pivotal connection with the coupler.