Abstract: Disclosed is a support structure, such as a liner hanger, for use in a well, including an assembly of slips for wedging to the interior surface of the surrounding well, but maintained off of wedging surfaces in a running in configuration by a drag assembly and latch mechanism connected to the hanger body carrying the wedges. As the latch is configured to permit setting of the support structure, a lost motion coupling joining the slip assembly with the drag and latch assembly permits rotational and limited longitudinal movement therebetween as the slip system moves rotationally, and possibly longitudinally to a limited extent, with the hanger body relative to the drag assembly.

Abstract: Disclosed is a rig for working on wells, and including a generally two-legged mast, with each leg constructed with a traveling pole telescoping about and along a gin pole. The mast may be so extended by means of a chain drive mounted on the traveling legs of the mast. Hydraulically-operated slips selectively lock each traveling leg to the respective gin pole to prevent the former from sliding down the latter. The mast may be lowered to, and raised from, a generally horizontal configuration for transport on a truck. A snubber, or other pipe gripping apparatus, may be suspended by the mast and folded under the mast as the mast is moved to a horizontal configuration. With the mast erect, a control console may be elevated by means of a winch line supported by the mast. The mast may be mounted on a skid carried by a truck, with the skid movable relative to the truck bed for the purpose of aligning the mast relative to a well.