Abstract: A tubular, flexible rubber-like junk boot is positioned on the lower end of a drill string, blade-type stabilizer to catch small but dense particles of debris which are not removed from the hole by the drilling fluid. The boot has means on its lower end for clamping the boot in place.

Abstract: The invention refers to a paddle wheel type pick-up device for loading stored piled bulk materials or the recovery of mined minerals. The pick-up arrangement is supported on the frame of a carriage parallel with the breakdown front of the stored pile, or mined surface and coordinated with a travelling beam, also hinged at the carriage frame, covering the breakdown front. The beam accommodates a cutting device.

Abstract: A well casing perforator adapted to be used with pneumatically powered rotary drilling equipment. It includes an upright elongated body which is inserted within the casing. The body is attached to the lower end of a drill rod which imparts vertical or angular movement to the elongated body while within the casing. The body is guided axially within the casing by rollers which engage the interior casing wall. A rotatable wheel has teeth capable of penetrating the casing wall as the wheel rolls in engagement with the casing. The wheel is mounted at the outer end of a carrier pivoted to the elongated body about a horizontal axis. The carrier in turn is controlled by a piston assembly subject to pneumatic pressure within the drill rod. The piston assembly is pivotally connected to the carrier to move it from a first position at which the wheel is retracted from engagement with the casing to a second position at which the wheel engages the interior wall of the casing.

Abstract: A drill bit is disclosed for drilling large diameter shafts. The drill bit comprises a main bit body having a plurality of rolling cutters rotatively mounted thereon. The cutters function to contact and disintegrate the earth formations at the bottom of the shaft thereby creating rock chips or cuttings. Water or drilling mud is pumped down the shaft and across the face of the main bit body for cooling the drill bit and for flushing the chips away from the shaft bottom. An auxiliary flow enhancer is attached beneath the main bit body for increasing the radial flow velocity of the drilling mud across the face of the bit body in order to remove the chips more efficaciously. The flow enhancer comprises a shaft mounted impeller such as a screw conveyor, a spiral brush, or a paddle-blade configuration. The shaft of each device is attached radially on the main bit body with each shaft having a drive wheel mounted thereon adjacent the bit body periphery.

Abstract: A conveyor-mounted mining machine incorporates at least two driving units. Each unit comprises a linearly drivable member operatively engaged with a driven wheel coupled by a clutch to a driving wheel drivingly engaged with a stationary part of the conveyor. With the clutch engaged, linear motion of the linearly drivable member imparts rotary drive to the driving wheel so as to propel the machine along the conveyor. The driving units are operated sequentially so that a continuous drive effort acts on the machine.

Abstract: An asphalt-paving cutter tool, adapted to be driven by a power-operated hammer mechanism, has an upper shank adapted to be received and held in the socket of the hammer mechanism, and a wide lower cutter portion terminating at the lower end in a chisel-like cutting edge. Intermediate the upper shank and the lower cutter portion is a wedging-and-reaction portion having divergently-upward sidewalls inclined at an angle of the order of 15.degree.-35.degree. relative to the vertical. This portion has two functions. It develops a wedging force to widen the cut, and it develops a reaction force in the blade-lifting direction. These two forces facilitate removal of the cutting tool from the asphalt paving after the cut has been made.