Abstract: A rotary well drilling unit, particularly for water wells, comprises a tubular rotatable drill string string through which water is pumped. Attached to the lower end of the drill string is a drill head having side-by-side cutter blades. The cutter blades are cammed radially outwardly to expand in diameter when the drill string is lowered to drill a hole sized to receive a well casing lowered behind the drill, and are cammed radially inwardly so as to contract in diameter to clear the casing when the string is lifted. The same drill may be used for drilling wells of different diameters by merely substituting cutter blades.

Abstract: An improvement is provided in continuous caster molds for quick disconnect of a mold wall from its spacing adjustment mechanism. A plate attached to the adjustment mechanism is aligned generally parallel to the mold wall. A pair of connections are provided adjacent upper and lower ends of the mold walls for connecting the wall to the plate. The lower connection is adapted to make the wall and plate readily separable at the lower connection. The improvement is provided in an upper connection which includes a pair of flange portions of the wall and plate having at least one pair of mateably aligned holes therein. A pin is adapted to fit in the holes of the flange portions and is threadedly engaged in the hole in one of said flange portions. Upon removal of the pin, the wall and adjustment mechanism are made readily separable and one can be lifted free of the other.

Abstract: A continuous casting mold is adapted for measurement of the clamping force exerted on the mold sidewalls. A method of adjusting the mold size includes measuring the clamping force and adjusting it to a predetermined value, preferably a value related to the size to which the mold is adjusted. The method may also include monitoring the clamping force during casting and adjusting it so as to maintain it constant at said predetermined value.

Abstract: A gauge for aligning the mold of a continuous-casting machine with a guide roll-rack beneath the mold. The gauge includes elongated bars and connecting links pivoted to the bars forming a parallelogram. Brackets are pivoted to one or more of the links and carry dial indicators. The bars have portions which have straight side edges for abutting the rolls of the roll-rack, and portions of reduced width to lie within the mold. The dial indicators have plungers for abutting the mold walls.