Abstract: There is disclosed a tool for washing over, cutting and retrieving a portion of a pipe or "fish" stuck within a well bore. The tool includes flipper dogs which may move downwardly over a coupling on the pipe, and then raised into gripping engagement with the pipe beneath the coupling, and knives which are forced inwardly into gripping engagement with the pipe in response to an upward strain on the pipe string following engagement of the flipper dogs with the pipe, whereby the pipe may be cut upon rotation of the pipe string.

Abstract: A two speed accessory drive (10) comprising an input unit (20) and a remotely positioned output unit (100) connected by a plurality of belts (108,100). The input unit is adapted to be driven by a remotely positioned driving member (102). The output unit, which is connected to the engine accessories by a serpentine belt (106), includes a linear actuator (280) for engaging and disengaging same.

Abstract: A method and apparatus for obtaining complete loading on a drill bit at the end of a drill string in a borehole employ at least three rosette strain gauges uniformly disposed on an instrument sub to measure torque and axial force on the sub, two bending moments in mutually perpendicular directions, and two shear forces in mutually perpendicular directions. These measurements are used to obtain torque on bit, weight on bit, two side forces on the bit normal to each other, and two bending moments on the bit normal to each other which, in turn, can be used to control the bit movement.

Abstract: A packer and service tool assembly for oil or gas well preparation includes a disengageable coupling mechanism which permits the tool to be screwed into and out of the packer and which can be hydraulically disengaged so that the tool can be removed without applying torque to the tool or workstring. A releaseable ratchet mechanism is also provided in the packer for trapping the setting loads when the packer is set in the casing. The ratchet mechanism is releasable by pulling up a housing portion which cammingly engages collapsible ratchet fingers thereby disengaging the ratchet finger trapping teeth from a stationary ratchet ring.

Abstract: Method and apparatus for altering the downhole flow path of control fluids or the like in oil and gas wells. A downhole side pocket mandrel in a tubing string has interconnected thereto a supply conduit from the surface and a plurality of receiving conduits. Each receiving conduit is connected to a control device. A plurality of different plug assemblies is provided, each for completing within the mandrel pocket when disposed therein a different hydraulic flow path between the supply conduit and one or more receiving conduits. The plug assemblies are insertable into and retrievable from the mandrel pocket by conventional running tools. Any desired control device may thereby be controlled at the surface with a single supply conduit by selection of the proper plug assembly. In a preferred embodiment, the plug assemblies are comprised of a plurality of subplugs which may be interconnected in differing orders to form the desired plug assembly.

Abstract: An improved concrete block intended to serve as a roadway defining member. The block is in the shape of an elongate concrete body having an essentially triangular cross-sectional configuration with one bottom face and two preferably symmetrical side faces. Each side face is formed closest to the bottom face with a straight threshold portion sloping at a gradient of 1:5, which portion is connected to a second straight portion sloping at a gradient of 1:7 via an essentially circularly arcuate concave portion.

Abstract: A percussion drill having a rounded and tapered contact surface conformation between the inner ends of hardened insert members closely received by cavities in a drill bit. Each insert has a radiused inner end in contacting relation with the bottom wall of its associated cavity. The radius is such that it compensates for angular deviations in the cavity bottom wall due to manufacturing tolerances from a normal relation relative to the cavity longitudinal axis. The radius of the insert inner end is calculated on the basis of a mathematical formula. The arrangement provides a structure which prevents corner load and stress, and insures contact away from the corner to thereby increase bit life.

Abstract: A novel asphalt compacting machine of the type having a chassis, a drive roller, e.g. at the rear, and a steerable rolling compaction mechanism, e.g., at the front, is provided herein. The improvement resides in a novel front, preferably steerable, rolling compaction mechanism which comprise two longitudinally-spaced-apart tandem rigid drums, preferably free-wheeling, extending across the entire lateral width of the chassis, the drums entraining an elastomeric, e.g. rubber, asphalt-compaction belt therearound. A lower means, e.g. a flat plate, is operatively associated with the rolling compaction mechanism and is disposed between the rigid drums to engage substantially the entire bottom inner surface of the belt between the two rigid drums. In this way substantially the entire outer bottom surface of the belt between rigid drum is urged downwardly into pressure contact with the asphalt being compacted, thereby to provide a flat, pressure-applying surface.

Abstract: Belt (1) of flexible polymeric material, in particular an elastomeric material, for the transmission of motion between two pulleys (6), comprising at least one longitudinal slot (2) defined by a bottom (3) and two lateral walls (4, 5). The belt passes from a first position in which the walls (4, 5) of the slot (2) are at a certain distance from the opposite lateral surfaces of the pulley, to a successive position during the winding of the belt around the pulleys, whereby the pull exercised on the inextensible reinforcing elements (7) of the belt leads to the approach of the slot walls to the opposite lateral surfaces of the pulley (6), resulting in the transmission of motion through friction.

Abstract: In the in-situ retorting of oil shale using radio frequency electrical energy, an applicator is inserted into a borehole and energized at a radio frequency. A protective device protects the applicator from expansion of the oil shale formation. The protective device includes an end plate attached to the applicator and a plurality of elements surrounds the applicator and is in contact with the end plate so as to prevent the oil shale formation from contacting the applicator.

Abstract: A transmission particularly adapted for use in ultralight aircraft, air boats, home built aircraft or the like has a transmission case within which four gears are contained to provide the requisite speed reduction. A torque input gear is coaxially mounted with an output gear so that the transmission torque input shaft is in axial alignment with the transmission output shaft. A pair of intermediate speed reduction gears are laterally offset from the input and output gears and are mounted on a common jackshaft. One of the intermediate gears is belt driven by the input gear and the other intermediate gear belt drives the output gear to provide the requisite speed reduction. The gears and drive belts are toothed. The use of toothed drive belts and gears provide for positive drive of the transmission components.

Abstract: A casing in an oil well is constructed to provide for the flow of oil in the well. The casing cylindrical and may be perforated. The casing is resonant in a hoop mode at a particular fundamental frequency such as approximately 400 hertz. A transducer includes a transducer member disposed within a tubing in spaced relationship to the tubing. The transducer member may be a ceramic slotted at one end and supported by the tubing at the other end. A ring may envelope the ceramic member and may be slotted at the same position as the ceramic member. The tubing may be filled with a fluid which provides dielectric properties and operates to transmit vibrations from the transducer to the tubing. The transducer may vibrate in the hoop mode at the fundamental frequency of resonance of the casing. These vibrations are transmitted to the casing through the fluid in the tubing, the tubing and the oil in the casing to produce a resonance of the casing at the particular fundamental frequency in the hoop mode.

Abstract: An improved pavement extractor is disclosed herein which comprises a completely self-contained unit for removal of pavement in a situation where a new pavement is to be created. The device includes a combination of rippers and a hold-down pressure plate which efficiently extracts the pavement from the sub-base, a control chamber where the extracted pavement is led from the rippers and the hold-down pressure plate, which control chamber has located therein a pair of opposed rollers which controllably hold the pavement while a beater mechanism beats off pieces of the pavement of predetermined adjustable size. From the beater mechanism, the extracted pavement is conveyed to an elevator mechanism included in the device which conveys the now beaten small size pieces of pavement up to a sufficiently high level so as to enable the loading thereof into a vehicle such as a dump truck.

Abstract: A down the hole product flow jet pump with a reverse flow removable injection nozzle that can be in the form of an orifice member placed in a plug or a one piece orifice and plug member that is moveable up and down the pumping fluid line dependent on the direction of fluid flow and/or non-flow in the line. The jet pump includes a check valve that opens for inflow of product from the well only when a drawing vacuum is created in the jet pump vacuum chamber so normal pumping flow can be stopped and reversed with the check valve closing when pumping flow stops and remaining closed during reverse flow in the system. A trap is provided at the wellhead into which the injection nozzle is floated with reverse flow of pumping fluid in the system. The injection nozzle is removable from the trap for servicing or replacement by insertion in the trap and then, with the trap opened, permitted to float down or be pumped down to seat in the jet pump housing on location down the hole.

Abstract: A threaded nozzle is adapted to be screwed into and screwed out of a threaded opening in a drill bit. The nozzle includes a front face having first and second contact surfaces which are adapted to be engaged by a manually actuable tool for screwing-in and screwing-out the nozzle. The first contact surface is inclined toward the direction of rotation in which the member is screwed-in, so that in response to the application of a force to the first contact surface for screwing-in the nozzle, a reaction force is applied against the tool for pushing the tool off the first contact surface when the nozzle has been screwed-in a predetermined extent.

Abstract: A system for an infinitely variable transmission having a primary pulley having a hydraulically shiftable disc and a hydraulic cylinder for shifting the disc, a secondary pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc, a belt engaged with both pulleys. A hydraulic circuit has a transmission ratio control valve comprising a spool for selectively shifting the disc of the primary pulley in the downshift direction and upshift direction, and a pressure regulator valve for regulating the oil pressure is operatively connected to the hydraulically shiftable disc to detect transmission ratio during operation. A shifting device is provided for shifting the spool of the transmission ratio control valve in the upshift and downshift direction in dependency on throttle position.

Abstract: Stuck well pipe is removed from a well bore by applying an upward pull to the stuck pipe while applying an upward jarring action to the pipe by an air hammer which applies rapid blows to a linkage mechanism connected to the pipe.

Abstract: A centralizer apparatus having turbolizer protuberances includes groups of openings for receiving set screws to define a plurality of circumferential and longitudinal points of engagement between the centralizer and a tubular string to which it is attached. Associated with the centralizer is a bonding layer of adhesive material, which is injected through one of the openings while the centralizer is rotated relative to the tubular string to obtain a rigid bond between an outer surface of the tubular string and a majority of the inner surface of the centralizer. The bond can be broken by the external application of heat so that, after also loosening the screws, the centralizer can be removed from the tubular string.

Abstract: This invention discloses a rolling cone drilling bit having a plurality of cutters which have inserted therein hard metal cutting elements preferably formed of tungsten carbide alloy; and in which bit the rolling cone cutters are located in such a manner that their rotational axes are greatly offset from the rotational axis of the drill bit. In addition, a fluid jetting system is provided in the invention that directs a pressurized fluid spray across the main cutting inserts and against the formation face so that when the drill bit is used in its most advantageous areas, such as the soft, medium-soft and plastic formations, the jetting system prevents "balling up" of the cutters and greatly increases the drilling efficiency of the bit.

Abstract: A self-contained tensioning device for a belt or similar structure and which includes a plunger slidably mounted in a body member, a free piston slidably mounted in the plunger and having a head portion extending from a shoulder of the body member and which contacts with an idler pulley so as to apply a tensioning face to the belt, a projection provided on the shoulder and projecting axially so as to minimize the distance between a portion of the idler pulley contacting the head portion and the shoulder of the body member.