Abstract: A continuous feed system for a drill comprising a down-hole drill assembly having a support end and a drilling bit. Rotation is imported to the down-hole drill assembly between the support end and the drilling bit, which results in a torque being applied to the support end. A vertically disposed support chain has two ends, one end of the chain is connected to the support end. The chain resists the torque with limited torsional flexibility. A drive interacts with the chain at a point between the two ends for positively providing axial extension of a length of the chain.

Abstract: A quick detach bit apparatus includes a wear sleeve having a chuck threaded thereinto. A bit is mounted within the chuck. The bit and chuck are interconnected by mating, axially extending splines and grooves. The chuck includes a resiliently mounted segment urged into engagement with the bit. A quick release tool is accommodated in a passage between the bit and chuck. The tool is inserted into the passage and has a thickness sufficient to urge the segment out of engagement with the bit so that the bit is removed from the chuck.

Abstract: A dynamic earth anchor, which is forced from a tubular body, comprises a combination of a roof bolt and a tubular, deformable sleeve. The sleeve is insertable into a terrestrial borehole, at a closed end thereof, and then the bolt is inserted into the sleeve. This establishes an almost immediate restraint of the terrestrial formation in which the borehole is formed; the sleeve lockingly secures the bolt, and the bolt causes the sleeve to impress radial forces to the wall of the borehole. The sleeve of the anchor is defined by two edge portions to facilitate its insertion into the borehole, and to permit its slight opening to facilitate bolt entry thereinto the body has an interior and an exterior surface. The slit extends between the interior and exterior surfaces, tangentially intersecting with the interior surface. When the anchor is inserted, it is monitored in a substantially uniform cross sectional width regardless of minor diameter variations of the borehole, which cause sliding of the edge portions.

Abstract: A high temperature fluid sensor has a fusible detector including a body having longitudinally extending conductors therein. A first portion of the conductors is confined within the body whereas a second portion of the conductors projects from an end of the body. The second conductor portions are spaced-apart to define a void therebetween. A fusible material is engaged with, and electrically bridges between the second conductor portions. A tapered portion of the sensor permits the molten fusible material to flow away from the second conductor portions. The tapered portion terminates in spaced-apart relationship with the fusible material and thus further defines the void.

Abstract: A wobble piston apparatus incorporates a cup-type seal seated on a land formed about the head of the piston, and secured by an annular ring. The head of the piston and the ring have chamfered edges which facilitate an engagement of the ring with the piston head, on assembly, and the chamfered edge of the ring further cooperates with the piston to define a void which accommodates therein an extruded expansion of an innermost, peripheral edge of the seal.

Abstract: The sensor is formed with a polymer body which confines electrical conductors, with the conductors projecting from opposite ends of the body. The conductors' projections at one end define terminal blades, and at the opposite end are shrouded with, and electrically connected by, fusible material that is molded in place. An electrically inert buffer, formed of the same body polymer, is introduced between the conductors at the opposite end, and the fusible material is deposited about the ends and buffer as a cylindrical shell. A V-shaped notch is formed in the buffer for lockingly-engaging the shell. The body has wrenching flats formed thereabout and tapered pipe threads formed thereon to allow its installation in the wall of a pressure vessel, pipe, or housing, with the fusible-material end exposed therewithin.

Abstract: A waterjet cutting apparatus for limiting pressure spikes caused by hydraulic pressure surges. A hydraulic pump pressurizes hydraulic fluid used to operate the apparatus. An intensifier is driven by the pump. An on-off nozzle valve actuator is coupled to the pump and to the intensifier. First and second linkages are provided. The second linkage has a lost motion slot formed therein. An output control device is provided in the pump for controlling output from the pump and thus controlling the level of hydraulic fluid pressure admitted to the intensifier. A first control arm is coupled to the output control device and movable between a "MAX" and "MIN" position. An on-off nozzle actuator opens and closes the on-off nozzle valve remotely by way of the first linkage. A second control arm is coupled to the on-off nozzle valve actuator device and is movable between an "ON" and an "OFF" position.

Abstract: A drill pipe transfer arm supports the bottom portion of a drill pipe and positions it in relationship to the drill string to permit angle drilling with a tilted drill tower. The transfer arm is uniquely suited to circular carousels and features a drill pipe conforming saddle which permits close-quarter operation with a packed carousel.

Abstract: A valve for use in applying brake releasing pressure to brake chambers in a vehicle air brake system having reservoirs each containing air for either service or emergency use and having air pressure supply lines. The valve includes a housing. A chamber is formed in the housing. A port permits air communication between the valve and a supply line. A passage interconnects the port and the chamber. Reservoir ports interconnect through the passage. A first plurality of one-way check valves in the passage permit air to pass therethrough from the port to the reservoir ports. A second plurality of one-way check valves in the passage permit air to pass therethrough from the reservoir ports to the chamber.