Abstract: A light fixture harp for securing to a cylindrical portion of a light fixture to attach a lampshade to the light fixture. The light fixture harp comprise a cylindrical collar having an inner vertical wall for securing the cylindrical collar against the cylindrical portion of the light fixture, a clamp for reducing the circumference of the cylindrical collar to clamp the cylindrical collar to the light fixture, a wire frame attached to the cylindrical collar, and a shade rest secured to an upper end of the wire frame to retain the lampshade. The cylindrical collar circularly extends from a first flat end to a second flat end and comprises an inner vertical wall for securing the cylindrical collar against the cylindrical portion of the light fixture. The first flat end is substantially parallel with the second flat end, and the first and second flat ends comprise oppositely disposed holes, one of which is preferably threaded.

Abstract: A double shoulder drill stem connection for high torque applications includes a thread taper within a range between about 1.0 and 1.2 inch per foot. The thread form is characterized by a stab angle between about 35 and 42 and a load angle between about 25 and 34 degrees and by a short thread height with elliptical roots and with crests having an angle which slopes in an opposite direction with respect to the joint centerline from the thread taper. A drill string includes a tool joint having different inner diameters for a substantial axial length to provide enhanced strength in the threaded portion of the joint.