Abstract: An apparatus for stabbing and threading a safety valve into a well pipe to prevent upward flow comprises a tubular canister rotatably mounted on a carriage assembly that is slidably mounted on an upstanding frame. The lower end of the frame has a swivel mounting to a bracket that is attached to the side of an elevator-type clamp by which the apparatus is clamped onto the upper end portion of the pipe. An alignment mechanism moves the frame from a first position wherein the canister is not aligned with the pipe to a second position wherein the canister and pipe are aligned and the safety valve can be stabbed and threaded into the pipe. A variable drive mechanism is operated to cause the canister, and the valve located therein, to be rotated and simultaneously lowered toward the pipe. The drive mechanism may be adjusted to facilitate threading of the valve into a variety of drill pipe thread designs. An improved clamp assembly allows adjustment in its size so as to accommodate drill pipe of various diameters.

Abstract: In accordance with an illustrative embodiment of the present invention, an apparatus for stabbing and threading a safety valve into a well pipe to prevent upward flow comprises a tubular canister rotably mounted on a carriage assembly that is slidably mounted on an upstanding frame. The lower end of the frame has a swivel mounting to a bracket that is attached to the side of an elevator-type clamp means by which the apparatus is clamped onto the upper end portion of the pipe. With the canister pivoted into position over the pipe, a gear drive is operated by a hand wheel to cause the canister to be rotated and simultaneously lowered toward the pipe whereby a safety valve mounted inside the canister is automatically threaded into the upper end of the pipe and can be closed to shut off upward flow.

Abstract: Disclosed is a clasp assembly for gripping a submarine hydraulic hose or the like which is being suspended by a metal cable. The clasp comprises a tubular clasp body including two matching partial tubular clasp elements which are hinged together along one edge. Lock means which are provided to maintain the two elements together about the hose includes a flange which diverges from each clasp element. A releasable fastener means draws the two flanges toward each other to lock the clasp in its closed position. Each of the clasp elements is equipped with a liner of rubber-like material to provide a firm friction grip on the hose. Clamp means are provided on the exterior of one of the clasp elements for attaching the clasp assembly to a cable or the like used to suspend the hose.