Abstract: The present disclosure can provide for an ultrasonic welding method for a pair of workpieces. The method can include first pressing an ultrasonic welding stack against a first workpiece in the pair so that the first workpiece comes into contact with a second workpiece in the pair. The method can then provide for initiating a weld phase by outputting energy from the ultrasonic welding stack to the first workpiece. The method can provide for monitoring, with at least one sensor, a sensed parameter. The sensed parameter can be, for example, weld force and/or weld force rate of change. The method can provide for determining whether the sensed parameter has reached a predetermined level. Based on determining that the sensed parameter has reached the predetermined level, the method can provide for ending the weld phase.

Abstract: A lift frame for conducting wireline or coiled tubing operations on an oil rig comprises a main frame and a substantially cylindrical lift sub for lifting the lift frame assembly by means of a block. A pivot is provided between the main frame and the lift sub. The lift frame is provided with skids for supporting the assembly in an undeployed position with the main frame being substantially parallel to a resting surface such as a rig floor. In the undeployed position, the lift sub extends vertically upward from the resting surface. When the lift sub is engaged by elevators coupled by links to the lifting block, the lift frame assembly can be raised into a deployed position wherein the main frame pivots relative to the vertical lift sub to be substantially perpendicular to the resting surface. Difficulties in engaging a horizontally-oriented lift sub are therefore eliminated.

Abstract: A gripping apparatus for engaging a tubular. In one embodiment, the gripping apparatus comprises a collet structure adapted to receive the end of a tubular therein. A barrel is moveably engaged with the collet structure and is moveable from an open position to a made-up position. The collet structure comprises a substantially cylindrical top section and a bottom section that is divided into a plurality of elongate blades each having a gripping structure formed at an unsupported end thereof. In the made-up position, a flared bottom section of the barrel engages and compresses the respective gripping structures, flexing the blades inwardly and causing engagement of the gripping structures with the sidewall of the tubular. In one embodiment, the barrel is slidably engaged with the collet. In an alternative embodiment, the barrel takes the form of a nut that is threadably engaged with the collet.

Abstract: An emergency escape device for hazardous elevated structures such as offshore oil and gas drilling rigs and production platforms and the like. This device comprises a platform with an overhead support and a centrally located opening. A line is attached to the overhead support an hangs vertically through the opening. Persons may escape peril on an elevated structure by sliding down the line to safety. When not in use the line is compactly stored within the opening.