Abstract: A self-locking sealing plug having first and second cylindrical body members of the same diameter and mounted one to the other for relative movement, the first body member having a pair of radially-extendable slides at an end thereof with a spring member therebetween urging the slides outwardly, retaining pins on the second body member for holding the slides in a retracted position within the perimeter of the first body member and releasable by separating movement of the body members, a sealing flange on the second body member, and connecting structure for drawing the body members toward each other to decrease the distance between the extended slides and the sealing flange and with such movement bringing the retaining pins into engagement with the slides to hold the slides extended.

Abstract: A pipe end preparation machine having a frame supportable in oriented relation from and beyond an end of a pipe, a tool head mounted on the frame for rotation about an axis, a tool slide mounted on the tool head for carrying a tool for movement along a path radial to said axis, a drive mechanism including a remotely controllable motor for advancing said frame toward the pipe end to provide axial feed for the tool, and drive mechanism for advancing said tool slide to provide radial feed for the tool including a remotely controlled motor which can be controlled to vary the radial feed rate in a continuous controlled manner. The remotely controllable motors for radial and axial feed of the tool permit threading, facing, and turning operations as well as other operations wherein circular interpolation effectively provides a third tool axis of movement as provided by the two axes of movement derived from the radial and axial feed.