Abstract: A centering spinner for centering and spinning down hole tubulars having a range of diameters. The centering spinner includes a frame capable of admitting a down hole tubular therein and a plurality of roller assemblies pivotally coupled to the frame to converge upon and center the down hole tubular. According to a further feature, adjacent rollers of the roller assemblies of the centering spinner are axially displaced with respect to a down hole tubular retained therein.

Abstract: A stabilizer for attachment to a drill string in shaft drilling has an improved bearing. The stabilizer has an inner hub that is rigidly secured to the drill string above the bit. An outer hub encircles the inner hub. The outer hub has a centralizing device that extends laterally outward for frictionally engaging the walls of the shaft if the drill string wanders off-center. The bearing between the inner and outer hubs includes a plurality of rollers rotatably mounted to one of the hubs and in rolling contact with the other of the hubs to allow rotation of the hubs with respect to each other. In the preferred embodiment, the hub opposite the one containing the rollers has frusto-conical rings that are engaged in rolling contact by the rollers.

Abstract: An improved means for making up and breaking out sections of drill pipe is disclosed herein. The make-up and breakout system is adapted for drill rigs having powered rotaries and powered carriages for moving the rotary up and down the mast. A wrench is mounted to the carriage for gripping the first section of the pipe. Slips are mounted at the work table for gripping the second section of pipe to support the string of pipe and prevent its rotation. The wrench is powered independently of the rotary, and the wrench and rotary can also rotate a certain amount with respect to each other while the wrench is gripping the first section of pipe. The independent power of rotation allows the wrench to breakout the first section from the second section. It also allows the rotary to breakout the first section from the rotary while the wrench restrains the first section from rotation.

Abstract: A high speed lens grinding and polishing machine comprising a lap tool holder and a gimbal mounted polishing element disposed at its lower extreme in a spherical bearing permitting a lens blank holder to follow the contour of the lens during the polishing process. Relative movement between the lap tool holder and lens blank holder is generated by a rotary drive operatively coupled to the polishing element and a linear drive operatively coupled to the lens blank holder.

Abstract: An apparatus dispensing a molten metal alloy bonding agent for bonding a lens block to a lens blank. The apparatus comprises a pneumatically pressurized vessel including a thermostatically controlled heating element to dispense molten metal alloy therefrom. The apparatus further includes a control valve to selectively control the flow of molten metal alloy from the vessel.