Abstract: A liner hanger assembly has a slip actuation system which is locked for run-in. A piston assembly bolts onto the mandrel in a sealable manner to actuate a mechanical lock. Upon release of the lock, a plurality of springs actuate a sleeve which is in turn attached to the slips to move them relative to their slip seats. The slip seats are preferably mounted to the mandrel without welding and have longitudinal spaces for mud or cement flow therebetween. Load is distributed from each slip through its slip seat into the mandrel without interaction from an adjacent slip or slip seat. A rupture disk ensures that a predetermined pressure is built up before the piston can actuate to defeat the lock. The lock can come in a variety of configurations. One of which is a sliding sleeve over a dog and another is a yoke over a split ring which, when shifted, allows the split ring to expand, thus unlocking the parts.

Abstract: A rotary hand tool driven by reciprocal thrusts of a handle in which reciprocal motion is caused by extensions from a rotating shaft assembly engaged with elongated, axially spaced helical slots in a housing coaxial with the shaft and fixed to the handle.

Abstract: A rotary torque producing tool having a pistol grip handle with a manually grippable and displaceable part, a rotary tool operating shaft, clutch members mounted for rotation in surrounding relation to the shaft and being operatively connected to the displaceable handle part for rotation of the clutch members upon gripping of the handle and part, the drive means providing rotation of the clutch members in opposite directions about the shaft upon gripping displacement of the handle part, and means selectively engaging the clutch members and shaft for obtaining optional direction of rotation of the shaft. The drive structure includes a barrel member mounted for longitudinal reciprocation coaxially of the shaft and being formed with a pair of reversely configured spiral cams which are operatively connected by cam followers to the clutch members. The clutch members are formed to provide unidirectional driving connections to the shaft, i.e.