Abstract: A charge air cooler includes a tube block having a plurality of finned tubes and a tank assembly at each end. Each of the tank assemblies includes a tank body for receiving one of the ends of the finned tubes in the tube block. A connecting plate, a heat resistant flexible gasket and a backing plate provide a first resilient seal with each of the tubes and the connecting plate. A flexible annular seal extends around the connecting plate for providing a second resilient seal between the connecting plate and the tank body. The connecting plate includes a base having a plurality of spaced tabs extending therefrom, and the tank has a plurality of spaced raised bosses around the exterior thereof adjacent the open face of the tank which are so sized and positioned as to interdigitate when the tank is assembled to the connecting plate.

Abstract: In a double heat exchanger with a condenser and a radiator, a flexible portion formed into a wave shape to be flexible is provided in a side plate at least at one side of connection portions of the side plate, connected to condenser header tanks and radiator header tanks. Further, a slit is provided to be recessed from one longitudinal end of the side plate to the flexible portion. Accordingly, a heat stress generated in condenser tubes and radiator tubes can be absorbed by the flexible portion even when a length of the slit is made shorter.

Abstract: The condenser assembly structure is disclosed. The opening of the outgoing pipe is positioned below the upper openings of the heat transfer tubes in the inner space of the upper header pipe. Cutouts are formed in the upper ends of heat transfer tubes, which are located within an upper header pipe. A lubricant mixed in a refrigerant is introduced from the inside of the upper header pipe into the heat transfer tubes by way of the cutouts. The outgoing pipe defining is attached to the lower header pipe at a position close to its end. A total passage area of first heat transfer tubes through which the refrigerant flows downward is larger than that of second heat transfer tubes through which the refrigerant flows upward. The total passage area of the second heat transfer tubes is smaller than that of third heat transfer tubes through which the refrigerant flows downward.

Abstract: A stacked-type heat dissipating apparatus of the present invention includes at least one layer of heat dissipating plate stacked upon a heat guiding plate. The heat dissipating plate has a plurality of strip-shaped projections formed therein to provide a separation space between at least one layer of heat dissipating plate and the heat guiding plate. Each of the strip-shaped projections having two ends respectively formed a first pierced edge in a punch press for providing an air guide channel. Whereby the present invention has a high stacking density at small volume integrally and to assemble easily, further to provide a large porosity, to reduce hydraulic resistance and hydraulic noise.

Abstract: A compact cooling system including a radial fan directing air flow outwardly and a plurality of heat exchangers disposed around the radial fan. Each heat exchanger has a plurality of tubes extending between an inlet header and an outlet header, with the headers extending generally in the same direction as the fan axis. A system inlet is connected to the inlet headers and a system outlet is connected to the outlet headers, whereby the length of the connection between each heat exchanger and the system outlet and system inlet is generally the same for each heat exchanger.

Abstract: In such an exchanger, in which the blocks have fluid inlet openings in communication with the interior space of a supply box which runs alongside the block and communicates with at least one analogous box of an adjacent block to form a fluid supply line, in order to even out the distribution of fluid between the openings of the blocks, the supply line contains at least one grating (30) leaving perforations (301) and solid parts (302) which are distributed in such a way as to create pressure drops which are such that the flow velocities of the fluid in the inlet openings downstream of the grating have similar values.

Abstract: A heat exchange assembly comprises a plurality of plates disposed in a spaced-apart arrangement, each of the plurality of plates includes a plurality of passages extending internally from a first end to a second end for directing flow of a heat transfer fluid in a first plane, a plurality of first end-piece members equaling the number of plates and a plurality of second end-piece members also equaling the number of plates, each of the first and second end-piece members including a recessed region adapted to fluidly connect and couple with the first and second ends of the plate, respectively, and further adapted to be affixed to respective adjacent first and second end-piece members in a stacked formation, and each of the first and second end-piece members further including at least one cavity for enabling entry of the heat transfer fluid into the plate, exit of the heat transfer fluid from the plate, or 180° turning of the fluid within the plate to create a serpentine-like fluid flow path between points o

Abstract: The invention relates to a plate-type heat exchanger having a plate block comprising partition plates which delimit flow channel layers between the plates. According to the invention, the partition plates have a solid or folded edge, which projects out of the plane of at least one main side of the partition plates at the edge side, along closed-edge regions which are spaced apart from one another in the peripheral direction by means of intervening open-edge regions. In the plate block, this solid or folded edge is joined in a fluid-tight manner to the opposite edge region of an adjoining partition plate and functions as a lateral boundary for the associated flow channel layer. Such heat exchangers may be used, for example, in automobiles and reactors of fuel cell systems.

Abstract: The apparatus is a heat pipe with superior heat transfer between the heat pipe and the heat source and heat sink. The heat pipe is held tightly against the heat source by mounting holes which penetrate the structure of the heat pipe but are sealed off from the vapor chamber because they each are located within a sealed structure such as a pillar or the solid layers of the casing surrounding the vapor chamber. Another feature of the heat pipe is the use of more highly heat conductive material for only that part of the wick in the region which contacts the heat source, so that there is superior heat conductivity in that region.

Abstract: Disclosed is a head assembly of a heat exchanger for a vehicle including heads each consisting of a plurality of head pieces coupled together in a laminated fashion, thereby being capable of achieving an easy manufacture thereof and a reduction in manufacturing costs while easily coping with a changed specification. The head assembly includes at least two heads spaced apart from each other, a plurality of tubes coupled between the heads in a laminated state and defined with fluid passages, respectively, and a plurality of centers each interposed between adjacent ones of the tubes and adapted to provide an improved heat exchange efficiency. Each of the heads includes at least two head pieces assembled together in a laminated state. A separator is interposed between the head pieces. Caps are coupled to opposite ends of the head pieces, respectively.

Abstract: A method for manufacturing a heat exchanger for a cooling cycle includes the steps of: preparing the pipes and the fins having through-holes through which the pipes are inserted, arranging the fins parallel depth-wise and in several separate groups depth-wise and then inserting the pipes through the through-holes of the fin groups, bending the outer portions of the pipes so that the fin groups separated from each other are piled in layers along the longitudinal direction of air flow and the inner portions of the pipes are arranged in at least two coplanar rows along the longitudinal direction of air flow, and wrenching the bending portion of the pipes to form each pipe row into a zigzag shape.

Abstract: An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having a sloping face, commonly known as the directional portion of a whipstock. The toolguide is coated with a material such as epoxy or polyurethane to provide a repairable surface and one which can be removed to facilitate removal of the toolguide from the well bore. The lower orienting section has a latch which extends radially outwardly from the section and can be locked in the outwardly biased position.

Abstract: Methods and apparatus are provided which permit well testing operations to be performed downhole in a subterranean well. In various described methods, fluids flowed from a formation during a test may be disposed of downhole by injecting the fluids into the formation from which they were produced, or by injecting the fluids into another formation. In several of the embodiments of the invention, apparatus utilized in the methods permit convenient retrieval of samples of the formation fluids and provide enhanced data acquisition for monitoring of the test and for evaluation of the formation fluids.

Abstract: An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having a sloping face, commonly known as the directional portion of a whipstock. The toolguide is coated with a material such as epoxy or polyurethane to provide a repairable surface and one which can be removed to facilitate removal of the toolguide from the well bore. The lower orienting section has a latch which extends radially outwardly from the section and can be locked in the outwardly biased position.

Abstract: A downhole tool for cleaning internal surfaces of subsea drilling rig equipment, including drilling risers, blowout preventor assemblies and wellhead assemblies, as well as for retrieving wear bushings, comprising an elongated support body, at least a pair of scraper blades and wash ports. A unique method of cleaning internal surfaces of subsea drilling rig equipment and retrieving a wear bushing in a single operation.

Abstract: A casing centralizer and assembly comprising a tubular and a centralizer, the centralizer comprising a plastics material.

Abstract: This relates to a gas separator (8) of the cascade type, with stratified or non-stratified flow, equipped with automatic level control to perform a process of the gravitational separation of two immiscible fluids of different densities, particularly to separate the gaseous phase from a two-phase mixture (liquid and gas). It is installed at the bottom of an oil well, upstream from a lifting pump (12) in order to minimize the entry of gas into pump (12). The level control system comprises a valve (29), a spring (30) and a packer (26). It is based on the combined effects of the abovementioned components (26, 29, 30), the gas pressure on the region of perforated casing (10) and the thrust exerted on a settling vessel (3) by the liquid on which it floats. The separator according to the invention has a control system for the level of the liquid stored in settling vessel (3) mounted within its separator (8), ensuring flow of the mixture which is ideal for the occurrence of gas separation.

Abstract: A method of heating gas being produced in a well reduces condensate occurring in the well. A cable assembly having at least one insulated conductor is deployed into the well while the well is still live. Electrical power is applied to the conductor to cause heat to be generated. Gas is allowed up past the cable assembly and out the wellhead. The heat retards condensation, which creates frictional losses in the gas flow.

Abstract: The improved recovery of hydrocarbons from subterranean formations by hydraulically fracturing a subterranean formation is accomplished. Fracturing fluids using a viscosifying surfactant fluid containing viscosifying micelles, for example, wormlike micelles, are useful to improve recovery of hydrocarbons and limit the loss of fracturing fluid into the formation fracture face. The invention further relates to novel fracturing and acidizing methods useful for increasing hydrocarbon production, limiting water production, resisting fracturing fluid loss into the subterranean formation, and reducing the equipment requirements in mixing and pumping fracturing fluid. The action of viscosifying micelles of surfactant in aqueous zones of the subterranean formation diverts fracturing fluid or acid from the aqueous zones to the hydrocarbon-bearing zones and also facilitates the flowback of increased amounts of hydrocarbons once a fractured well is placed back on production.

Abstract: An improved method for drilling a lateral well from an existing wellbore is disclosed whereby a section of said existing wellbore is preferably enlarged such as by under-reaming. The enlarged section is filled with a material such as, for example, epoxy which hardens to form an impermeable body. The hardened material is drilled out laterally and also longitudinally, such that a sealed junction is formed within the impermeable body between the lateral well and existing well. The longitudinal drilling follows an arcuate path. In one embodiment of the present invention, a packer positioned within the enlarged section may be filled with the pumped material to thereby avoid any contamination of the material with other downhole elements such as mud and oil whereby the composition of the pumped material is consistent and known. In one embodiment, an arcuate drillable guide may be positioned in the enlarged section prior to filling the enlarged section with material.

Abstract: An improved method for drilling a lateral well from an existing wellbore is disclosed whereby a section of said existing wellbore is preferably enlarged such as by under-reaming. The enlarged section is filled with a material such as, for example, epoxy which hardens to form an impermeable body. The hardened material is drilled out laterally and also longitudinally, such that a sealed junction is formed within the impermeable body between the lateral well and existing well. In one embodiment of the present invention, a packer positioned within the enlarged may be filled with the material to thereby avoid any contamination of the material with other downhole elements such as mud and oil whereby the composition of the material is consistent and known. In one embodiment, a drillable guide may be positioned in the enlarged section prior to filling the enlarged section with material to thereby subsequently guide a drill bit through the hardened material for reestablishing a path within the existing wellbore.

Abstract: The invention provides a method of cutting a well casing located beneath a subsea wellhead (1), the method comprising the steps of: running a cutting tool through the wellhead (1) into the casing; securing the position of a motor (7) relative to the wellhead (1) so as to transmit rotary reaction forces from the motor (7) to the wellhead (1) or a fixture secured relative to the wellhead; and operating the motor (7) so as to rotate the cutting tool and thereby effect cutting of the casing. The invention overcomes the problems associated with prior art techniques of requiring the use of explosive charges or a drilling rig located above the wellhead.

Abstract: An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having a sloping face, commonly known as the directional portion of a whipstock. The toolguide is coated with a material such as epoxy or polyurethane to provide a repairable surface and one which can be removed to facilitate removal of the toolguide from the well bore. The lower orienting section has a latch which extends radially outwardly from the section and can be locked in the outwardly biased position.

Abstract: An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having a sloping face, commonly known as the directional portion of a whipstock. The toolguide is coated with a material such as epoxy or polyurethane to provide a repairable surface and one which can be removed to facilitate removal of the toolguide from the well bore. The lower orienting section has a latch which extends radially outwardly from the section and can be locked in the outwardly biased position.

Abstract: An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having a sloping face, commonly known as the directional portion of a whipstock. The toolguide is coated with a material such as epoxy or polyurethane to provide a repairable surface and one which can be removed to facilitate removal of the toolguide from the well bore. The lower orienting section has a latch which extends radially outwardly from the section and can be locked in the outwardly biased position.

Abstract: An apparatus and method of operating devices (such as devices in a wellbore or other types of devices) utilizes actuators having expandable or contractable elements. Such expandable or contractable elements may include piezoelectric elements, magnetostrictive elements, and heat-expandable elements. Piezoelectric elements are expandable by application of an electrical voltage; magnetostrictive elements are expandable by application of a magnetic field (which may be generated by a solenoid in response to an electrical current); and heat-expandable elements are expandable by heat energy (e.g., infrared energy or microwave energy). Expandable elements are abutted to an operator member such that when the expandable element expands, the operator member is moved in a first direction, and when the expandable element contracts, the operator member moves in an opposite direction.

Abstract: A horseshoe 10 with a plurality of nail patterns provides opposed mirror-image left and right branches 20, 30 connected by a bridge 40. The bridge is flexible enough that the left and right branches are able to move with respect to each other in response to the “splaying” or radial expansion of the horse's hoof when weight is applied. Scribe marks 50 defined on the lower surface of the bridge provide indica to guide a horseshoer in grinding the bridge to provide greater flexibility. At least two nail hole patterns, an inner nail pattern 60 and an outer nail pattern 70 are defined between the upper and lower surfaces of the left and right branches. The inner nail hole pattern is used where the horse's hoof wall is approximately ⅜″ thick and generally healthy. The outer nail hole pattern is used where the hoof wall thickness is much less, often approximately ⅛″, and the hoof's health is devastated.

Abstract: The invention relates to a fire fighting apparatus comprising a plurality of spray heads (5a′ to 5e′), a tube system (2′, 3a′, 3e′) for leading extinguishing medium from an extinguishing medium source (2′) having a volume for extinguishing medium to the spray heads, at least one drive gas source for driving extinguishing medium at a high pressure via the tube system to the spray heads, and release means for activating at least one of the spray heads.

Abstract: Fire prevention and suppression systems and breathable fire-extinguishing compositions are provided for rooms, houses and buildings, transportation tunnels and vehicles, underground and underwater facilities, marine vessels, submarines, passenger and military aircraft, space stations and vehicles, military installations and vehicles, and all other human occupied objects and facilities. The system provides a breathable hypoxic fire-preventative atmosphere at standard atmospheric or local ambient pressure. The system employs an oxygen-extraction apparatus supplying oxygen-depleted air inside a human-occupied area or storing it in a high-pressure container for use in case of fire. A breathable fire-extinguishing composition is introduced for constant fire-preventive environments, being mostly a mixture of nitrogen and oxygen and having oxygen content ranging from 12% to 17%.

Abstract: A hammer drill has a motor which drives an axially displaceable intermediate gear mounted in an intermediate gear arrangement. An impact mechanism is formed by including interacting impact cams between either the intermediate gear and the housing, or the motor armature shaft and the housing to generate a reciprocating motion on an output spindle or shaft. A spindle locking mechanism is included which causes an intermediate gear to be disengageable with respect to the output shaft, while still permitting the impact mechanism to be engaged. Such an arrangement allows the hammer drill to operate in a hammer-only or chipping mode.

Abstract: A solder glass comprising, by weight: about 60 to 67% Sb2O3; about 27 to 32% B2O3; and from greater than 0 to 10% ZnO. The glass has a softening point between 388 and 466° C., depending on the ZnO content. The glass can be employed as a molten seal in electrical devices such as tungsten halogen or metal halide lamps.

Abstract: An electronic device, comprising: a substrate of insulating resin having at least a pair of interior terminal portions for connection upon an upper surface thereof; an electronic element mounted on the terminal portions on the upper surface of said substrate, having at least a pair of electrode terminals thereof; a frame member of insulating resin, bonded on the upper surface of said substrate, and having a cavity formed for storing said electronic element therein; and a cover member of insulating material, for hermetically sealing over the cavity of said frame member, in which said electronic element is stored, wherein electrodes are formed at or in vicinity of positions of the terminals of said electronic element stored within said cavity, for electrically conducting said interior terminal portions for connection to an outside, or wherein roughened surfaces are formed on metal electrode portions, which are formed on the upper surface of said substrate for electrically conducting said interior terminal porti

Abstract: An electronic package which has a polygonal shaped heat slug. The heat slug extends from a top surface of a package which has a plurality of vias. The package also has a number of capacitors that are mounted to the top surface. Some of the capacitors are located between the heat slug and the vias. The polygonal shape of the heat slug provides additional space on the top surface so that capacitors can be added without eliminating vias from the package.

Abstract: A combined wall mount and electrical outlet box unit for mounting on a wall surface including a molded plastic combination of a housing having side walls and a front wall, flanges having inner edges proximate the housing and extending outwardly from the side walls, spaced inner walls formed integrally with the insides of certain of the side walls and the front wall to define an electrical outlet box, a preformed opening in the front wall between the inner walls leading to a chamber which constitutes the electrical outlet box, a plate sealed across the inner edges of the flanges for enclosing the rear side of the housing, openings in the plate for receiving wires leading into the chamber of the electrical outlet box, and arcuate score marks on the front wall on opposite sides of the preformed opening.

Abstract: The object of this invention is to provide a relay unit and a housing for that unit to be used when a number of relay switches are installed side by side in a circuit to switch a power supply circuit on and off. A number of compartments are provided in a case with an open top such that one relay fits into each compartment. The relays are placed into these compartments, and a cover is fitted onto the open top of the case. Slits are provided along the upper edge of the case and/or in the cover, through which the connectors attached to the terminals of the various relays can pass. The cover is placed on top of the case with the connectors attached to the terminals of the various relays running through the various slits. With this invention, a number of relay switches are put into a single package (housing), thus making the relays easier to handle. The package makes it easier to mount and wire multiple relay switches.

Abstract: The invention concerns a busbar bushing device (10) adapted to be mounted through an orifice (O) in a wall (P) and to have a conductive busbar (12) passed through it, of the type including a body (14) through which a conduit (20) for receiving said busbar (12) passes completely and a cover (16) attached to said body (14). The cover (16) includes an opening (24) through which said busbar (12) passes and which extends the conduit (20) of the body (14). The opening (24) in the cover (16) is bordered externally by an elastically deformable peripheral lip (26) adapted to be pressed in a sealed manner all around the contour of the conductive busbar (12).

Abstract: There is provided a wire harness comprising a bundle of electric wires round which an adhesive tape made of resin composition, the principal component of which is polyolefine, the coefficient of heat-contraction against adhesion at 180° C. of which is not less than 30%, is wound.

Abstract: An electrical device invented for creating multiple AC/DC wire repairs and connections on any electrical circuit using small gauge electrical wire. The conductor of the connectors is to be of any ductile metal of choice. As with the insulator is to be of any material which can be used in the process of heat formed injection molding and said material must be able to be colored: red, blue, and yellow to keep with the standard color code of wire identification in the electrical industry. These connectors are to accommodate the wire gauge sizes of #22, smallest to #12, largest.

Abstract: A superconducting wire having a fine line made of an oxide superconductor which has metal material dispersed therein, the outer periphery of which being coated with a conductive material; and a manufacturing method for the superconducting wire, comprising a process for drawing a metal pipe; filled with an oxide superconductor so as to product the fine line and a process for heating the fine line at a temperature which is higher than the melting point of the metal material constituting the metal pipe.

Abstract: An interposer includes a substrate having opposing surfaces. Conductive terminals are disposed on both surfaces, and conductive terminals on one surface are electrically connected to conductive terminals on the opposing surface. Elongate, springable, conducive interconnect elements are fixed to conductive terminals on both surfaces.

Abstract: A circuit board substrate assembly includes a generally planar circuit board substrate material having a longitudinal axis extending along a length of the substrate material between a first end and a second end thereof. The circuit board substrate material further has a first edge and a second edge extending along the length of the circuit board substrate material between the first end and the second end. A plurality of openings are defined in the substrate material. Each opening extends between a first distance from the first edge of the circuit board substrate and a second distance from the second edge of the circuit board substrate. Further, each opening separates adjacent circuit forming regions lying along the longitudinal axis and has first and second opposing end portions.

Abstract: An encapsulated circuit board arrangement comprising a thin interface layer with one or more vias for input/output interface to the circuit. The encapsulated circuit board arrangement further comprises one or more sequentially processed layers added to one side of the interface circuit. The sequentially processed layers are preferably made by additive offset printing technology. The encapsulated circuit board arrangement further comprises a layer of adhesive. A first side of the adhesive layer is attached on top of the uppermost and most exposed layer. The encapsulated circuit board arrangement further comprises a support carrier attached on a second side of the adhesive layer.

Abstract: A surface laminar circuit board includes an insulating layer, and a signal ground conductive layer disposed on an upper surface of the insulating layer. The conductive layer has a hole formed therein. A photosensitive dielectric layer is disposed on an upper surface of the signal ground conductive layer. The dielectric layer has a photo micro-via formed therein. A signal trace is disposed on the photosensitive dielectric layer, and is electrically coupled with the signal ground conductive layer by way of the photo micro-via. A conductive pad is provided, which has a majority thereof within an area defined by an outer periphery of the hole. The conductive pad is electrically coupled with the signal trace. A surface mounted component is mounted on the conductive pad.

Abstract: A printed circuit board of the present invention is formed of an electrical insulating base material with through holes that are formed in a thickness direction of the electrical insulating base material and are filled with an electrical conductor; the electrical insulating base material including a core layer formed by impregnating a holder with a resin and resin layers formed on both sides of the core layer; and wiring layers that are formed on both surfaces of the electrical insulating base material into a predetermined pattern and are electrically connected to each other by the electrical conductor. The wiring layer is embedded in at least one of the resin layers. The resin layers on the both sides have different thicknesses from each other, and a thinner layer out of the resin layers has a thickness equal to or smaller than a mean particle diameter of an electrically conductive filler contained in the electrical conductor.

Abstract: A printed wiring board comprises an insulating layer having first and second surfaces and the wiring layers. The insulating layer has a via electrically connected between the wiring layers. The via has one end opened on the first surface and the other end closed by the wiring layer on the second surface. The inner surface of the via is covered with a first plating layer. The first plating layer continuously covers the wiring layer exposed within the via and that portion of the wiring layer which is formed on the first surface and which faces one end of the via. A second plating layer is laminated on the first plating layer. The second plating layer electrically connects the wiring layers by cooperating with the first plating layer.

Abstract: A method and structure for personalizing a multi-layer substrate structure includes supplying a generic layer having electrical features and altering the electrical features to produce a personalized layer of the multi-layer substrate.

Abstract: An early formation evaluation tool is provided which includes formation fluid sampling capabilities. In one disclosed embodiment, fluid pressure in a drill string in which the tool is interconnected is utilized to operate packers of the tool and to operate fluid samplers of the tool. To successively control actuation of the samplers, a ratchet mechanism responsive to altering fluid pressures in the drill string aligns a piercing member with a series of frangible pressure barriers associated with the samplers.

Abstract: Apparatus and method for drilling into strata adjacent to a well casing through an existing hole in a side of the well casing at a desired elevation therein, including a flexible tube for passage through the hole having a first end, an opposite second end, and an internal cavity extending therethrough between the first end and the second end, a nozzle for passage through the hole on the first end of the flexible tube, the nozzle having at least one aperture therethrough in communication with the internal cavity of the flexible tube, and structure suspendable in the well casing and connected to the second end of the flexible tube for supporting the flexible tube and the nozzle in the well casing at the desired elevation for passage through the hole, the structure including an element for rotating the flexible tube and the nozzle when extending through the hole relative to the structure, and the structure including an internal passage connected in communication with the internal cavity of the flexible tube and

Abstract: The friction-reducing drill pipe component in the form of a sub (10) is adapted to form part of a drill string. The sub (10) comprises a tubular mandrel (12) having first and second ends for connection to adjacent components of the drill string. A sleeve (18) is mounted on the mandrel (12), and first and second stops on the mandrel (16, 20) restrain the sleeve (18) against axial movement relative to the mandrel (12). One of the stops (20) is removable or retractable to permit the sleeve (18) to be removed over the first end of the mandrel.

Abstract: A bearing failure indicator for sealed and lubricated rolling cutter earth boring drill bits is disclosed. A plurality of cutting inserts, arranged in a plurality of rows, are secured in the rolling cone cutters. At least two of the rolling cone cutters are intermeshing cutters, arranged such that they have intermeshing rows of cutting inserts. A groove is formed in the intermeshing cutters with a row containing a plurality of generally flat top bearing inserts. In the normal operation of the drill bit, the rows of generally flat top bearing inserts do not contribute to the drilling action of the drill bit. However, when a bearing assembly fails in operation, the generally flat top bearing inserts engage the intermeshing rows of inserts in the adjacent intermeshing cutter causing the drilling torque to increase and thereby providing a signal indicating the bearing has failed.