Abstract: Electrodes are embedded respectively in a first die and a second die. A metal workpiece is placed in a cavity defined between the first die and the second die which mate with each other. Then, a molten metal is poured through a passage into the cavity. The molten metal is solidified into a casting, forming a contact region of the metal workpiece and the casting. Thereafter, an electric current is supplied from a power supply between the electrodes across the contact region. The supplied electric current breaks an oxide film that is present on the surface of the metal workpiece, and joins the metal workpiece and the casting in the contact region.

Abstract: A molten metal molding machine is provided with a heating cylinder, a linear motion member for successively feeding preheated metal rods into the heating cylinder from its rear end to successively push the metal rods toward a forward end of the heating cylinder, and a heater arranged on the heating cylinder such that the metal rods are gradually molten as they move through the heating cylinder from its rear end toward its forward end. The molten metal molding machine includes a guide pipe arranged on the forward end of the heating cylinder to downwardly feed molten metal into an injection sleeve, and an injection plunger arranged selectively movably forward and rearward in the injection sleeve such that by a forward movement of the injection plunger, the molten metal fed into the injection sleeve is injected and filled into a mold to subject the molten metal to cold-chamber molding.

Abstract: A casting robot (1) which includes a pivoting device for a foundry ladle (3) that is suspended by the casting robot is provided. At least one weighing cell (23) is located in the area connecting the foundry ladle (3) to the casting robot (1). The cell is used to dynamically measure an instantaneous amount of molten material present in the foundry ladle (3) or the amount of molten material poured into a casting mold (7).

Abstract: A method for the continuous casting and direct deformation of a metal strand, especially a cast steel strand, includes guiding the metal strand in a curved strand glide after the continuous casting mold, subjecting the strand to a secondary cooling with a liquid coolant, and preparing the strand in an automatically controlled way for the deformation pass at a uniform temperature field in the strand cross-section, such that the cast strand is cooled with a liquid coolant only in the longitudinal sections in which the cast strand is liquid in the cross-section. The temperature of the cast strand is equalized in a transition zone before, in, and/or after a bending-straightening unit by insulation of the exterior surface that is radiating heat, without the use of the liquid coolant, and is further equalized by heat radiation in zones until the temperature field consists of elliptical, horizontally oriented isotherms.

Abstract: An air conditioning system for an automobile prevents leakage of condensed water by locating two drain parts respectively on an air conditioning case and a protective cover having a drain structure beneath the air conditioning case. A drain hose, connected to and communicating with the drain parts, discharges the condensed water to the outside of the automobile without dispersion of the condensed water by forming a condensed water discharge pipe positioned on the protective cover. The protective cover, mounted on the bottom surface of the air conditioning case, surrounds the inflow and outflow pipes and has an auxiliary drain part formed at a side thereof. The drain hose connects the drain part of the air conditioning case with the auxiliary drain part of the protective cover.

Abstract: An coaxial-flow heat exchanging structure having a proximal end and a distal end for exchanging heat between a source of fluid at a first temperature and the environment (e.g. air, ground, water, slurry etc.) at a second temperature. The coaxial-flow heat transfer structure comprises: a thermally conductive outer tube section, and an inner tube section having an inner flow channel and being coaxially arranged within the outer tube section. An outer flow channel is formed between the inner and outer tube sections, and helically-extending turbulence generator is provided along the outer flow channel, so as to create turbulence along the flow of heat exchanging fluid flowing between the inner and outer flow channels, and thereby increasing the heat transfer through the walls of the outer tube section to the ambient environment.

Abstract: A coaxial-flow heat exchanging structure having a proximal end and a distal end for exchanging heat between a source of fluid at a first temperature and the environment (e.g. air, ground, water, slurry etc.) at a second temperature. The coaxial-flow heat transfer structure comprises: a thermally conductive outer tube section, and an inner tube section having an inner flow channel and being coaxially arranged within the outer tube section. An outer flow channel is formed between the inner and outer tube sections, and helically-extending turbulence generator is provided along the outer flow channel, so as to create turbulence along the flow of heat exchanging fluid flowing between the inner and outer flow channels, and thereby increasing the heat transfer through the walls of the outer tube section to the ambient environment.

Abstract: The present invention relates to a two part thermally conductive adhesive composition comprising: a first part comprising: a polymerisable monomer component which is (meth)acrylate based; a peroxide-based curing agent component; one or more co-curative components selected from: primary, secondary or tertiary amines or compounds containing the group —CONHNH—; a stabilising component; a thermally conductive filler component; and a second part comprising: a polymerisable monomer component which is acrylate or methacrylate based; a catalytic component for catalysing the cure reaction; a stabilising component; and a filler component wherein at least one part of the composition has a filler component which comprises a thermally conductive filler. The thermally conductive filler can be in the first part or the second part or both parts but is desirably in the second part. The compositions are useful for bonding heat generating components such as electrical components to a substrate such as a heat sink.

Abstract: The invention provides a heat-dissipating device and method. The heat-dissipating device comprises a transmitting device, at least a fin, and a fan. The transmitting device comprises a heat-dissipating channel and a passage. The passage comprises a converging intersection connecting to the heat-dissipating channel and the channel. The heat-dissipating method comprises dividing a air into a first airflow and a second airflow, and guiding the first airflow to pass through a fin while guiding the second airflow to converge into the first airflow and then passing through the fin together.

Abstract: An integrated liquid cooling system (100) includes a pump (10), a mounting base (15), a heat dissipating member (20). The mounting base defines therein a through hole (151). The heat dissipating member is mounted to and maintained in fluid communication with the mounting base. The pump is received in the through hole of the mounting base. The pump has a bottom plate for thermally contacting a heat generating component and is configured for driving a coolant to circulate through the mounting base and the heat dissipating member. The pump, the mounting base and the heat dissipating member of the liquid cooling system are combined together to form an integrated and compact structure without utilizing any connecting pipes or fittings.

Abstract: An apparatus (1) for cooling electronic components (2, 3, 4) comprises laminated plate-like parts that form a flow duct through which a liquid coolant can flow. At least one plate-like frame element (8) having cutouts (9, 10, 11) is arranged between the plate-like parts, wherein the cutouts (9, 10, 11) form sections of a coolant flow duct for selectively cooling electronic components mounted on mounting areas on one or more surfaces of the apparatus.

Abstract: A thermal management system (201) is disclosed which comprises (a) a liquid medium (207), (b) a heat generating device (203) disposed in said medium, (c) a heat transfer device (205) in thermal contact with said heat generating device, said heat transfer device comprising a thermally conductive material and having a channel (213) defined on a surface thereof, and (d) a synthetic jet ejector (223) adapted to direct a jet of the liquid medium along said channel.

Abstract: The present invention relates to a tube/plate condenser for a cooling circuit of a refrigerator and/or freezer comprising a bent tube in which the cooling circuit medium can be condensed as well as a carrier panel of sheet metal to which the tube is secured. In accordance with the invention, the tube/plate condenser is characterized in that the carrier panel consists of an aluminum sheet and the tube is a steel tube. The present invention further relates to a refrigerator and/or freezer comprising a tube/plate condenser of this type.

Abstract: A heat exchanger with improved strength is provided. Strength improvement features on the heat exchanger separators provide for a more robust heat exchanger. Automotive applications, such as radiator and charge air cooler applications, with patterned strength improvement features, such as dimples, elevations, folds, depressions or deformations, or the like, are provided.

Abstract: In an air/refrigerant heat exchanger, particularly for a motor vehicle air conditioning system, including a plurality of flat tubes arranged in closely spaced relationship so that a narrow flow passage for air is formed therebetween, the flat tubes include passages through which refrigerant is conducted in the longitudinal direction of the flat tubes and are provided on their outer surfaces with longitudinal parallel recesses and projections such that the flat tubes are wave-shaped the recesses and projections flattening out toward the narrow ends of the flat tubes and provide for narrow flat rectangular end sections.

Abstract: A shell and tube heat exchanger particularly of enhanced diameter size of use, particularly, in the manufacture of sulfuric acid and having a plurality of an adjacent pair of longitudinal baffle plates located symmetrically and intermittently between and extending the length of the tube bundle. The exchanger is most advantageously made from segments which may be shipped to off-site locations for in situ manufacture of the heat exchanger, particularly when oversized heat exchangers are required when transportation of such large heat exchangers from an off-site manufacturing facility is not possible.

Abstract: A heat exchanger, including a coolant inlet, a coolant outlet, and flat tubes consisting of two joined parts having broad and narrow sides, the joined parts being stacked on top of one another and joined along their edges to form channels therebetween for flow of gas cooled by coolant flowing through channels between the flat tubes. A partial housing includes a first side, a second side, and a joining side between the first and second sides, with the flat tubes being arranged in the partial housing. The joining side of the housing has at least one cut-out with at least one joining strip between the first and second sides, with one of the inlet and outlet in the joining strip.

Abstract: The invention relates to a stacked plate heat exchanger (1), in particular, an oil cooler for motor vehicles, made up into an assembly from alternating dished plates and baffle sheets (3), stacked one on top of and inside the other, each comprising first and second through openings (7, 8), for the formation of distribution and collector channels, which are welded together to form said first and second flow channels, whereby the baffle sheets (3) form a stay between the stacked plates and the assembly is enclosed by a base plate (4) and a cover plate (5).

Abstract: An exemplary heat exchanger includes a heat exchanger core having a core side fluid space and a cover plate and a substantially U-shaped wall fitted at one end with an inlet header and, at an opposing end, with an outlet header, which in combination with the cover plate, define a shell side fluid space. In this example, the cover plate forms two seals with two opposing sides of the U-shaped wall, forms a seal with the inlet header and forms a seal with the outlet header Such a heat exchange may be suitable for use as an EGR cooler. Other exemplary devices, methods and systems are disclosed.

Abstract: A cooling fin assembly provides a plurality of cooling fins and each of the cooling fins has a cooling fin body with at least a recess part indenting toward a side thereof. The recess part has an insert space with a through hole slightly less than the entire area of the recess part for being passed through with a heat guide pipe. Further, a folded side surrounds the through hole and extending toward the side. Once a heat guide medium, which is inserted between the through hole and the heat guide pipe, is heated up to become in a state of melting during being set up, the molten heat guide medium distributes between the outer surface of the heat guide pipe and the through hole and over the folded side evenly.

Abstract: A cooling fin unit includes a plurality of cooling fins and a heat guide pipe. Each of the cooling fins has a through hole at the main body thereof and the heat guide pipe passes through the through hole respectively. A non-penetrating recess part is provided to indent toward a side of the main body near the outer side of the through hole and the recess part has a receiving space communicating with the through hole. A heat guide medium, which is received in the receiving space, is heated up to become a state of melting to fill with spots between the outer surface of the heat guide pipe and the respective through hole.

Abstract: A heat dissipating member which is disposed between a heat generating electronic component which when operated generates heat and reaches a temperature higher than room temperature and a heat dissipating component is characterized in that the heat dissipating member is non-fluid in a room temperature state prior to operation of the electronic component and acquires a low viscosity, softens or melts under heat generation during operation of the electronic component to fluidize at least a surface thereof so as to fill between the electronic component and the heat dissipating component without leaving any substantial voids, and the heat dissipating member is formed of a composition comprising a silicone resin and a heat conductive filler.

Abstract: The invention relates to a multizone air conditioning system (1) of a motor vehicle, comprising, when observed from the direction of airflow, a regulating organ (7?) for regulating the temperature, an evaporator (4) and a heating element (5), which are arranged in an air guiding housing (2). Said air guiding housing (2) has partition walls (8) and at least one partition element (9;16) for tightly separating the individual zones of the air conditioning system (1) in the heating element (5) and/or a heater (6), said partition wall cooperating with the partition walls (8) and/or partition elements (6;19) of adjacent components or the network of the heating element is as wide as the adjacent collecting tanks of the heating element in the direction of airflow and is tightly and directly located on a partition wall.

Abstract: A vehicular air conditioner includes a housing having a rear seat discharge passage for supplying mixed air to rear seats in a vehicle and a plurality of dividing ribs disposed in a face outlet which is open upwardly in the housing. Each of the dividing ribs has a communication path defined therein in the longitudinal direction thereof, the communication path being concave in confronting relation to the interior of the housing. Mixed air produced in a mixing portion in the housing is supplied from the face outlet to front seats in the vehicle. Part of the mixed air is supplied through the communication paths to the rear seat discharge passage, from which the mixed air is supplied to the rear seats.

Abstract: An oil well pumping apparatus for pumping oil from a well to a wellhead provides a tool body that is sized and shaped to be lowered into the production tubing string of the oil well. A working fluid is provided that can be pumped into the production tubing. A prime mover is provided for pumping the working fluid. A flow channel into the well bore enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area. A pumping mechanism is provided on the tool body, the pumping mechanism including first and second gerotors. The first gerotor is driven by the working fluid. The second gerotor is rotated by the first gerotor. The two gerotors are connected with a common shaft. The tool body has flow conveying portions that mix the working fluid and the produced oil as the oil is pumped.

Abstract: A guide track system is provided for a drilling rig floor robot. The system consists of a drilling floor insert having a rotary table and floor robot guide tracks disposed within the insert beneath its top surface. Spaced-apart parallel slots traverse the top surface from an edge of the insert substantially towards the rotary table. The floor robot is supported by a support member having support legs that extend downwardly through the slots into the insert to glidably couple with the guide tracks. Hydraulic rams disposed within the insert are used to move the floor robot along the guide tracks to and from the rotary table. The guide tracks are protected from drilling fluid and debris released onto the drilling rig floor as sections of drill pipe are tripped out of a drill string.

Abstract: A process for fracturing a selected region of a formation including: introducing a supply of fracturing fluid to the region of the formation until a first threshold is reached, adjusting the flow of the fracturing fluid to the region of the formation to reach a second threshold, adjusting the flow of the fracturing fluid to the region of the formation to reach a third threshold and ceasing flow of the fracturing fluid to region of the formation, the fracturing fluid being a non-participating gas and including a proppant in at least one of the stages of flow of the fracturing fluid.

Abstract: A downhole tool has a tubular body with an end, an exterior wall, and a bore. A mating surface is formed intermediate the exterior wall and the bore in the end of the tubular body. The mating surface is adapted to couple to a second downhole tool and has an integrated circuit. In several embodiments, the integrated circuit is an RFID circuit in communication with a downhole network through an inductive coupler. A tool identification system has surface equipment with RFID interrogating circuitry connected to a protected integrated RFID circuit in a downhole tool string component through a downhole network. A method for identifying a tool in a downhole tool string includes transmitting signals between surface equipment and identification circuitry in the tool through the downhole network.

Abstract: An economic method for in situ maturing and production of oil shale or other deep-lying, impermeable resources containing immobile hydrocarbons. Vertical fractures are created using horizontal or vertical wells. The same or other wells are used to inject pressurized fluids heated to less than approximately 370° C., and to return the cooled fluid for reheating and recycling. The heat transferred to the oil shale gradually matures the kerogen to oil and gas as the temperature in the shale is brought up, and also promotes permeability within the shale in the form of small fractures sufficient to allow the shale to flow into the well fractures where the product is collected commingled with the heating fluid and separated out before the heating fluid is recycled.

Abstract: Sintered, spherical composite pellets having high strength and low density, are described, along with processes for their manufacture. One method includes forming a green pellet from a mixture of clay, bauxite or a clay-bauxite mixture with a sacrificial phase such that upon sintering of the pellet, the sacrificial phase is removed from the pellet. The use of such sintered pellets in hydraulic fracturing of subterranean formations is also described.

Abstract: A downhole mill includes a plurality of cutters extending generally radially from a center region to a gage diameter, wherein the plurality of cutters includes a first serrated cutter blade having a plurality of peaks and valleys along its length. The plurality of cutters includes a second serrated cutter blade having a plurality of peaks and valleys along its length. The plurality of cutters includes a non-serrated cutter blade positioned upon the cutting face between the first serrated cutter blade and the second serrated cutter blade, wherein the peaks of the first serrated cutter blade is radially aligned with the valleys of the second serrated cutter blade.

Abstract: Subsea oil and gas production methods and apparatus and, more particularly, a tubing hanger design for facilitating the control of downhole hydraulic and electrical controls while running the tubing hanger. The tubing hanger may include means for switching hydraulic and/or electrical controls to a side penetrator before the hanger is landed in a tree body. The hanger may include alignment means to ensure proper positioning of hanger prior to landing in a casing. The present disclosure of a method of soft landing a tubing hanger to provide better control prior to landing in the tree body.

Abstract: A tool string stab guide for axially aligning first tool string components with second tool string components is disclosed. The stab guide has a body with an axial length along a longitudinal axis with a first and a second section. The first section of the body adapted for removable attachment within a diameter of a bore of a tool string component. The second section of the body has a centering element with a flow channel. The ratio of the axial length to the diameter is at least 2:1.

Abstract: A method and device for controlling the disconnection of a wireline (4), of the kind used in wireline operations in a wellbore, from a wireline tool (8), the wireline (4) being provided with a conductor (6) arranged to communicate signals, the signals being monitored at the wire-line tool (8) by means of a lower monitoring and control circuit (24), and the lower monitoring and control circuit (24) activating, by disappearance of signals from the surface, a disconnect device (12) after a predetermined time, the disconnect device (12) being arranged to disconnect the wireline (4) from the wireline tool (8).

Abstract: A well bore liner placement method and apparatus, including inserting a liner running assembly carrying a liner into a well bore, the assembly including a liner placement apparatus having an annular seal extending radially to sealingly engage the well bore, and pumping fluid into the annulus above the annular seal until fluid pressure on the upper surface area of the annular seal creates a force exceeding opposing bottomhole forces below the annular seal and thereby driving the liner down the well bore.

Abstract: An inventory control system for monitoring the removal and replacement of tools includes a container (2) having a plurality of tool storage locations in the form of recesses (10). Each recess (10) is individually-shaped to receive a specific tool, the shape of the recess being matched to the shape of the tool. A plurality of sensors (12) are provided for sensing the presence of tools in the recesses (10), each sensor being located adjacent a recesses. A data processor (16) receives signals from the sensing means and monitors the removal and replacement of tools, and an output device (14) indicates the presence and/or absence of tools in the container.

Abstract: Methods and kits are described for shoeing a hoofed animal. First, an acid conditioner is applied to a hoof for a time sufficient to etch and further expose the inner epidermis layer of the hoof. Then, a bonding resin is applied to the hoof. After drying or polymerization, a cement composition is applied to the area of the hoof where a shoe will be placed. Finally, a shoe is positioned in the cement composition and permitted to set, thereby affixing the shoe to the hoof.

Abstract: A lift system includes parallel connected cylinder circuits with cylinders mechanically tied together on a first lift wheel arm. The base end of a third cylinder connected to a second lift wheel arm is connected in parallel with the pair of cylinders. The rod end of the third cylinder is constrained for movement with the rod end of a fourth cylinder also connected to the second wheel arm. The rod end of one of the pair of cylinders is connected in series with the base end of the fourth cylinder to thereby constrain the third and fourth cylinders on the second lift wheel arm to move in unison with the pair of cylinders on the first lift wheel arm. Series cylinder circuits move the wing cylinders in unison with the main frame cylinders to keep the implement level. The hydraulic circuit is also plumbed to retract outer wing wheels during wing fold operations to eliminate outer wing wheel interference.

Abstract: A battery-operated driver-drill (1) includes an epicycle reduction gear unit (8) which encases a switchover sleeve (26) having inner teeth (27) and outer teeth (28). The gear unit (8) is rotatably mounted on second and third internal gears (19, 20) and integrally slidably connected with a slide pate (37). By operating the slide plate (37), the switchover sleeve (26) may be slid between a first position, in which the slide plate (37) engages one of the second and third internal gears (19, 20) while engaging axial ridges (29) of a first gear case (5), and a second position, in which the slide plate (37) simultaneously engages both the second internal gear (19) and a first carrier (10) adjacent to the second internal gear (19) while disengaged from the axial ridges (2).

Abstract: A power tool includes a grip portion having a vertically extending axis; a main body provided at a top end of the grip portion and having an axis intersecting the vertical axis; a motor for generating a rotational force; an output portion provided at one axial end of the main body projecting from the grip portion and rotatingly driven by the motor; a trigger provided on an upper output-portion-side surface of the grip portion for movement along a trigger moving zone; a stopper portion accommodated in the grip portion for protrusion and retraction into and from the trigger moving zone, the stopper portion adapted to, when protruded into the trigger moving zone, make contact with the trigger to thereby limit The maximum pulling amount of the trigger; and a stopper operating portion for operating the stopper portion.

Abstract: A gland (10) for supporting one or more cables (29) comprises an annular gland body (11) defining a hollow passage (12) that is open at either end (12a, 12b). A core (13) is insertable into and removal from the passage via at least one of the ends (12a, 12b) thereof. The core includes a resiliently deformable member (21) that can be caused, by compression, to expand to occupy the passage (12). The gland body (11) includes one more formations (27) to which a said cable (29) inserted into the passage is securable thereby to permit insertion and removal of the core or components thereof relative to the gland body (11) without the core (11) straining any of the cables (29).

Abstract: A connection protector kit for use with an electrical stub connection assembly, the stub connection assembly including first and second conductors forming a connection and defining a crotch therebetween, includes an insert assembly. The insert assembly includes an insert member and a sealant pad mounted on the insert member. The insert assembly is adapted to fit within the crotch of the stub connection assembly. The kit may further-include a cap defining a cavity and an opening communicating with the cavity, wherein the cavity and the opening are adapted to receive the stub connection assembly and the insert assembly is adapted to fit within the crotch of the stub connection assembly when the stub connection assembly is mounted in the cavity.

Abstract: A cable splice closure comprising a casing and at least one resilient end plug for closing a respective entry/exit port of the casing, the casing being capable of being closed around the said plug to close the closure, the said end plug having at least one opening through which a length of cable or other elongate member is capable of being fed into the interior of the closure, and at least one retention means for retaining the said cable or other elongate member with respect to the plug, the plug being compressed, in use, by closure of the casing such that the said cable or elongate member is held with respect to the plug by compression forces applied to the plug by the said casing.

Abstract: An elbow terminator has a socket in which an electrical probe is disposed. The terminator is insertable onto an electrical bushing such that a tongue of the bushing is received in the socket of the terminator, and the probe of the terminator is electrically coupled to a contact sleeve disposed within the tongue. A latching mechanism produces positive latching between the tongue and socket when the tongue has been inserted to a predescribed depth within the socket. In order to enable an operator to visually observe that the tongue has been inserted to the prescribed depth, the bushing carries a color band which becomes completely disposed (invisible) in the socket when positive latching occurs. Alternatively, the bushing can be provided with gauge tabs which become aligned with a witness line formed on the terminator when positive latching occurs.

Abstract: A circuit board and a circuit apparatus using the same which can prevent displacement and film exfoliation ascribable to thermal expansion, and suppress a drop in reliability at increasing temperatures. The circuit board of the circuit apparatus includes a metal substrate having pierced holes as a core member. Protrusions are formed on the top ends of the pierced holes, and depressions are formed in the bottom ends of the pierced holes. Wiring pattern layers are formed on both sides of this metal substrate via respective insulating layers. In order to establish electrical connection between the wiring pattern layers, a conductor layer which connects the wiring pattern layers is formed through the metal substrate via the pierced holes. The conductor layer thereby establishes electrical conduction between the wiring pattern layers. Furthermore, a semiconductor chip is directly connected to the surface side of the circuit board via solder balls.

Abstract: An RF shield arrangement (30) includes a first substrate (12) having a first or top ground plane (41), a second substrate (22) having a second or bottom ground plane (42), and a plurality of solder bumped areas (14) coupled between the top ground plane and the bottom ground plane forming at least one radio frequency shielded compartment. The top and bottom ground planes can be placed on or within the respective substrate so long as they serve to form the RF shielding in accordance with the embodiments herein.

Abstract: The invention relates to a method and device for the drilling, in particular the percussive drilling or rotary percussive drilling of holes (9) in the ground or in rock, a bore hole (9) being formed by a drill bit (1) that is mounted on a drill pipe (3), by a percussive and/or rotary movement. Several drill points (2), which can be coupled to the drill pipe (3) and driven independently of one another, are provided on the drill bit (1). According to the invention, the drill points (2) can be uncoupled from their rigid coupling to the drill pipe (3) upon completion of the drilling process and can be displaced towards the centre of the bore hole (9), thus permitting the entire drill bit (1) together with the drill points (2) and the drill pipe (3) to be simply and reliably removed upon completion of the bore hole (9).

Abstract: A device for overdrilling an underground line includes a rotating push and/or pull linkage having a front end, and a hollow-cylindrical scavenging head which is connected to the front end of the linkage and is equipped with nozzles. At least one of the nozzles has an outlet axis extending at an inclination in a direction of the line in a plane of a longitudinal axis of the scavenging head. In this way, the orifices of such nozzles which optionally also point opposite to the direction of advance are directed onto the line section.

Abstract: A roller cone drill bit for drilling earth formations includes a bit body having at least one roller cone rotably attached to the bit body and a plurality of cutting elements disposed on the at least one roller cone in a plurality of rows arranged circumferentially around the at least one roller cone, wherein at least one cutting element in the gage row, the heel row, or a surface of the at least one roller cone bounded by the gage and heel rows comprises thermally stable polycrystalline diamond or a thermally stable polycrystalline diamond composite. The at least one cutting element may be a TSD insert or a TSD composite insert and may be formed by brazing, sintering, or bonding by other technologies known in the art a thermally stable polycrystalline diamond table to a substrate. The interface between the diamond table and the substrate may be non-planar.

Abstract: The invention relates to an auger for making a borehole that presents in its inside wall a groove that is substantially helical, said auger comprising: a hollow core provided with an outer helical blade; a movable cutter gouge suitable for taking up an active position in which the gouge projects outside the volume defined by the periphery of the blade, and a retracted position in which it is placed inside said volume; and means for displacing said gouge from its retracted position to its active position and comprising an additional member mounted to move in said core in translation and/or in rotation, and placed at the bottom end of said core, together with control means for causing said gouge to be displaced from its retracted position to its active position in response to said additional member moving relative to at least the bottom portion of said hollow core.