Abstract: Pipe joint connections with set screws that have swivel-mounted feet. Such set screws when used with such connections flexibly and tenaciously retain pipe sections in the connections in the same manner that a toy "chinese puzzle" woven straw tube retains a person's fingers. The larger faces of such set screw feet allow the set screws to grip the pipe section with considerably less torque than that required by conventional set screws. Such connections form a flexible, strong coupling that maintains its holding power despite changes in pipe position and environmental factors such as temperature and pressure. Such connections are particularly well suited for joining polyvinyl chloride pipe sections to mechanical joint pipe fittings, valves and hydrants, although they are also extremely effective in joining conventional mechanical joint metal pipe sections to such attachments.

Abstract: Apparatus for attaching a catheter to a bag includes a pair of coupling rings for trapping a part of the bag wall between them. A cutter having a blade of circular or closed loop form makes a cut in the trapped wall and an elastomeric member for gripping a catheter is connectable to the cutter or to one of the rings. The catheter is inserted in the elastomeric member and through the rings, the member serving as a gaiter.

Abstract: A breakaway bolt (10) formed from a shaft (12) having a first end (14), a second end (16), and a breakaway shank (18). The breakaway segment is formed from laterally projecting and circumscribing flanges (22 and 24) that reduce in diameter to form cones (26 and 28) that intersect at a midpoint intersection (30) to create a preformed stress point that will break when the first end (14) or second end (16) is subjected to a predetermined lateral load. A breakaway spacer (32) formed in accordance with the present invention form a shaft (34) to have a first end (36) and a second end (38) that are connected by a breakaway shank (40). A first flange (44) and second flange (46) project laterally outward from and circumscribe the shaft (34) to form shoulders (48 and 50) and cones (52 and 54) that intersect at a midpoint intersection (56) to form a preformed stress point that allows the spacer (32) to break in any direction when subjected to a predetermined lateral load.

Abstract: An improved annular seal including a resilient seal ring, a first follower, a second follower being threadedly connected to the first follower, threads on the first follower for setting movement of the followers, a shear pin for releasably securing the second follower to the first follower, the first follower having a lower rim for engaging the resilient seal ring, the second follower having a lower extension for exerting a loading force on the resilient seal ring, the area of engagement of the first follower with the seal ring being substantially larger than the area of the second seal ring exerting the seal ring loading force. In one form the second follower includes a lower rim extending around the exterior of the first follower into engagement with the seal ring. In a modified form the first follower includes a plurality of openings through its lower rim and the second follower includes a plurality of pins extending through the openings to exert a force on the seal ring.

Abstract: A device for coupling the peripheral flanges of a pair of pipes comprising a pair of retaining members, each having a V-shaped groove for receiving a portion of the peripheral flanges of the pipes. The retaining members are pivotally coupled at one of their ends by a single hinge and releasably coupled at their opposite ends by an over-center latch mechanism. The over-center latch mechanism employs a compression bolt and nut to maintain a low profile. The over-center latch mechanism also has primary and secondary link members, the latter preventing the coupling from completely separating should the primary link members fail.

Abstract: Connectors for connecting coilable tubing and other relatively thin walled tubing strings to downhole tools are provided which are releasable to permit withdrawal of the tubing without a member connected to the tubing that is substantially larger in diameter than the tubing itself. One embodiment of the connector includes a body member having plural collet fingers which are engagable with the tubing distal end through cooperating circumferential grooves and lands. The collet fingers are retained in gripping engagement with the tubing by a retainer sleeve having a piston head which catches a pump down ball to block a flow passage in the retainer and allow a fluid pressure force to shear plural shear screws which hold the retainer in the finger engaging position. Alternate embodiments includes recesses formed in the wall of the tubing for receiving ball keys which are held in registration with the recesses by the connector body and a cooperating slidable sleeve member.

Abstract: An improved wellhead casing hanger for suspension of successive casing strings with particularly small annular spacings having an adapter sleeve of double wall construction which is utilized with a load bearing shoulder on the inside of the inner member for receiving a conventional expanding type hanger, with the annulus between the inner and outer walls providing an improved fluid return path without restricting the bore of the sleeve, packoff for sealing the annulus at the appropriate time and an installation tool.

Abstract: A mechanism for locking a casing in a stationary support has an intermediate element which can move elastically in a receptacle of the support. The receptacle has upper and lower conical flanks. Conical inner grooving of the intermediate element has conical flanks of an angle at the apex greater than the angle at the apex of the upper flanks of the receptacle and less than the angle at the apex of the corner flank. The resultants of the forces to which the intermediate element is subjected has a radial component. When pulled upward, the radial component is outward. Under a downward force, the radial component is inward.

Abstract: A positive position indicating tool includes a snap ring mounted on a mandrel. The snap ring is blocked on the mandrel by a shear sleeve and provides a positive stop to upward retraction of a work string. The snap ring is shearably released when it is desired to retract and/or retrieve the work string. The snap ring is supported on the mandrel by a shear sleeve which is locked onto the mandrel by shear pins. An annular recess is formed in the sidewall of the mandrel between the shear pins and the snap ring. As the tension loading on the work string increases above the combined shear strength of the shear pins, the shear sleeve and positive indication snap ring are displaced downwardly along the mandrel, and the snap ring moves into the annular recess and contracts radially out of obstructing engagement. The snap ring incorporates alternating slots which permit it to expand and recover without permanent deformation.

Abstract: A fail-safe bellows assembly eliminates the usual limit bolts and replaces them with a cylindrical guard that encircles the bellows element with its associated coupling flanges and interconnects said flanges so as to permit a limited safe magnitude of elongation and articulation. The guard is connected to one of said flanges, with a coupling or linking to the other flange that permits the desired safe freedom of movement. In one embodiment one of the flanges has the guard clamped to its periphery while the other flange couples to the guard with pins and apertures. Another embodiment uses pins projecting radially inwardly from the guard at one end, replacing the pins in the flange and cooperating apertures in the guard.In addition to the guards, an elastic sleeve is joined to the periphery of each flange with a fluid-tight seal, and a vent passage through one flange interconnects the inter-flange space with the exterior for safe discharge of any fluid escaping from the bellows element.

Abstract: The invention relates to a connecting piece for connecting tubular members such as hoses, pipes, or other structural parts, carrying fluids with each other. A clamping part is available which has two half shell-shaped clamping halves with one clamping surface curved in accordance with the outer circumference of the end of the tubular member to be inserted. In their plug-in position the clamping halves are arranged at a distance to each other which permits insertion of the plug-in end of a tubular member. In their clamping position they enclose non-displaceably the plug-in end of the pipe, the hose or similar and they are simultaneously fixed on a contact part of the connecting piece.

Abstract: A well tubing extension joint including a trash barrier. A top sub having an internal locking recess is connected on the upper end of a well packer mandrel. A trash barrier is connected on the lower end of an upper tubing string for releaseably engaging the top sub to permit the upper tubing string to move longitudinally relative to the packer and packer top sub. The trash barrier includes a body having locking collet fingers for releaseably locking the body in the top sub at the locking recess. The body has external rings seals for sealing with the top sub and an internal wiper seal for sealing with the upper tubing string extending through the body.

Abstract: A one-way septum valve in a connector device to maintain sterility is provided. The device prevents the backward flow of blood and body fluids through the connector to an injection device such as a syringe, I.V. unit, and the like.The valve includes a slit, resilient septum mounted within the connector, and a moveable plug spaced a short distance from the septum and adapted to move forward slightly upon contact with the injection device.When the injection device is moved forward, it will contact and drive the plug a short distance into the septum causing it to open and deform inwardly. This enables fluid from the I.V. unit, syringe, etc., to be fed through the septum opening and into a patient. When the injection device is retracted out of contact with the plug, the septum resiliency forces the plug back out of the septum which then closes and seals.

Abstract: A well casing suspension system comprising a casing hanger assembly with an expandable, multiple shoulder, split load ring that is radially expanded into supporting position in a mating groove in a wellhead housing by contact with a previously installed annulus packoff.

Abstract: Apparatus for effecting locking engagement with a well conduit recess comprises a locking tool having radially shiftable locking lugs which are shiftable to a locked position in the conduit recess by downward movement of a lock mandrel. A running tool is secured to the lock mandrel by a plurality of radially shiftable latching elements. Downward movement of the running tool produced by wireline manipulation will effect the downward displacement of the lock mandrel to shift the locking lugs outwardly into engagement with the latching recess; however, the latching elements will not release the lock mandrel from the running tool until full radial engagement of the locking lugs in the conduit locking recess has been achieved.

Abstract: A flanged coupling for the repair of pipelines and risers, especially for sub-marine repair and construction, and of unit configuration engageable over a first open pipe section and its flange to seal with a flange of a second open pipe section, and having a piston actuated by drawing said two flanges together and a shear member sequentially controlling operation of a slip and a packing to anchor and seal the coupling unit to the first pipe section operating a slip and a packing to anchor and seal the coupling unit to the first pipe section.

Abstract: A sealed cable connector includes a plug or coupler with a sleeve extending over the cable end and surrounding a strain relief ring, contoured annular seal and a thrust collar. The seal includes an outer ring and an inner ring which are connected with each other by a radial bridge. During assembly, the thrust collar and the strain relief ring cooperate with each other in such a manner that upon axial displacement of the thrust collar toward the strain relief ring by means of a screw plug turned into the sleeve, the bridge becomes sheared off thereby compressing the inner and outer rings within the respective inner and outer spaces between the thrust collar and the strain relief ring while at the same time the thrust collar presses the outer cable conductor against a contacting face of the sleeve.

Abstract: A hydraulic release tubing seal divider for connecting lower and upper tubing strings together in a wellbore, including an inner housing assembly connected with one of the tubing string and middle and outer housing assemblies connected with the other of the tubing strings, including hydraulically operable locking structure carried by the middle and outer housing assemblies for locking the tubing strings together while the strings are run into a well, and for hydraulically releasing the middle and outer housing assemblies from the inner housing assembly to permit relative telescopic movement in the well between the upper and lower tubing strings at the tubing seal divider.

Abstract: A device is provided for connecting a guide line of an undersea installation. Inside the body of the connector is fixed an axial rod supporting a locking jacket with fingers carried by resilient blades. The rod ends in a centering nose having a cut out, whereas, above the centering nose a sliding ring is mounted on the rod and is held in position by a shearable pin. The guide post has a bore whose divergent section forms with a divergent face a housing for the locking fingers. When, for unlocking the connection, a tractive force is exerted on the connector body, the pin is sheared and the ring, by sliding, opens the passage for the fingers, which allows the connector to be released and raised. This connector requires no angular position with respect to the guide rod and makes any disconnecting tool superfluous.

Abstract: A fitting for establishing a seal between an insulated electrical cable (70) and an electrical junction box, where the junction box wall has a threaded bore and a profiled through-hole having a camming surface and shoulder. The fitting includes a threaded nut (50) and a ferrule (30) which has tines (34) extending from a ring portion. The ferrule (30) and the nut (50) are slid over the insulated cable (70) and the assembly is brought in registry with the threaded bore (8) of the junction box. Screwing the nut (50) and ferrule (30) forwardly causes the tines (34) on the ferrule (30) to contact the camming surface (12), forcing the tines (34) into the insulation (72) and the insulation (72) into the shoulder (16), thereby establishing a sealed connection. In a further improvement, the nut (50) has first and second wrench-engaging portions (100, 101) formed integrally therewith.

Abstract: The invention provides an apparatus for limiting tension produced in a tubular string extending from a packer set in a subterranean well to the well surface. Such apparatus comprises a receptacle secured to the packer and defining an elongated seal bore, and a mandrel telescopically and sealably related to the seal bore, the mandrel being connected to the bottom end of the tubing string. In one embodiment, a collet, incorporated in the receptacle for cooperating with an abutment formed on the mandrel, thereby securing the mandrel and the receptacle in a telescopically contracted position until sufficient tensile force is exerted on the mandrel to cause the collet arms to be expanded by the abutment to permit upward movement of the mandrel relative to the receptacle.

Abstract: Method and apparatus for automatically separating a wireline conveyed through-tubing perforating gun from a cable assembly. The gun is joined to a hollow sleeve on the cable assembly by a sub closely received in each end retained thereto by shear members. The force of the explosion upon firing the gun shears the shear members and drives the sub into the sleeve, allowing the gun to drop into the well.

Abstract: A modular connector for interconnecting a coilable tubing string with a downhole electrical tool and wherein an electric signal conducting cable extends through the tubing string and through the connector. The connector includes a swivel coupling having a coupling body with a spherical socket for receiving a spherical coupling member which is connectable to the downhole tool through a cable connector body secured to the spherical coupling member. A pin disposed in the coupling body projects into a slot in the spherical coupling member to prevent rotation of the tool with respect to the longitudinal central axes of the connector and the tool. The connector includes a frangible coupling for retrieving the tubing string if the downhole tool becomes stuck. Separation of the frangible coupling exposes a fishing head for retrieving the tool.

Abstract: A quick release coupling device for securing end flanges of two adjacent pipes includes a clamp assembly. The clamp assembly has a plurality of clamping members disposed to straddle the two end flanges therearound so as to generally circumscribes the two end flanges. Each clamping member either has a spring or is of spring nature for resiliently urging the clamping member radially outwardly of the end flanges. The clamp assembly also has a plurality of connecting members for connecting respective adjacent pairs of clamping members so as to form an annulus provided a gap between two end clamping members. Coupling means is disposed in the gap for releasably connecting one end clamping member and the other end clamping member against the bias of the clamping members so as to complete the annulus.

Abstract: The invention relates to a safety connection for drilling purposes, especially for oil wells. The connection comprises two portions (1,2) which, during normal drilling, transmit the torque and the thrust required for the tool to operate, said torque and thrust being transmitted via a drive cone (11) and fluting (10). In the event of the tool becoming jammed downhole, strong axial traction breaks calibrated traction links (4) at a predetermined force, thereby separating said two portions (1, 2) and making it possible to abandon downhole solely the tool and the connection portion (1) connected thereto.

Abstract: A system for perforating a well with an annulus pressure firer is provided by the present invention. A pressure responsive means is positioned in a tubing string uphole a packer and includes a piston movable in response to a pressure differential between the upper annulus pressure and the pressure inside the tubing string. The movement of the piston is transferred through a second, concentric tubing string to a firing head on a perforating gun below the packer. The system includes a means for simultaneously decoupling the concentric tubing strings below the packer to drop the perforating gun to the bottom of the well.

Abstract: A connector for attaching a downhole tool to the end of a tubing string insertable in a wellbore includes a frangible coupling portion having a pin with a predetermined cross sectional area which will fail in tension to separate the connector from the tool if the tool becomes stuck in the wellbore. The pin is disposed in a body member of the connector and interconnected therewith by spring washers to absorb transient shock or impact loads on the tool. The connector includes passages for extending electrical conductors through the coupling portion whereby electrical signals may be transmitted through the tubing string to the downhole tool.

Abstract: A conductor tieback connector (T) thus having a tubular body (12) connectible to the lower end of a conductor or a string of conductors (C), a downwardly extending funnel (20) with two bearing surfaces and a tapered guide (24). The tapered guide (24) aids in initial stabbing of the connector (T) over a wellhead (W) and the two bearing surfaces (26, 30) operate on the outside of the wellhead (W) to force the tieback connector (T) into angular alignment under the influence of the weight of the conductor string. Seals (14, 16), located between the tieback connector (T) and wellhead (W), are compressed with axial movement of the tieback connector (T). A two-piece internal floating bushing (42, 42a, 42b), threadible (50, 52) on the interior surface of the tieback connector (T), is moved within the interior of the wellhead (W) where locking dogs (46) engage running tool grooves (40) in the bore of the wellhead (W) to clamp the tieback connector (T) onto the wellhead (W).

Abstract: A universal septic tank fitting useful as either an inlet sweep or an outlet tee includes a generally tubular member having first and second open ends with a portion of the tubular member adjacent the first end forming an angular bend so that the first end extends generally normal to the member. A tube adjacent the second end extends from the tubular member and in a direction generally opposite to the direction of the first end. A vent is provided along the outer periphery of the angular bend, and a removable closure over the vent is provided. In use, the first end is installed in the inlet wall of a septic tank elevated above the second end, and the closure is removed from over the vent. The same fitting may be used as an outlet tee by installing the extremity of the tube through the outlet wall of the septic tank, elevated with respect to the first end.

Abstract: A gravel pack safety sub selectively positionable in rotational or a non-rotational mode. The safety sub includes an adapter having lugs thereon and a mandrel having lugs thereon adjacent the adapter. A retainer attached to the adapter receives an end of the mandrel. The mandrel and retainer define an annular cavity therebetween, and a sleeve is positioned in the cavity. The sleeve has a hole therein which is nearer a first end thereof than a second end. The hole is alignable with an exterior recess in the mandrel and a shear pin positioned therethrough. The safety sub may be placed in a first position wherein the second end of the sleeve is adjacent the adapter and the lugs on the mandrel and adapter are separated. A bearing ring is positioned between the adapter and the mandrel for maintaining the separation of the lugs and providing a bearing surface therebetween.

Abstract: The union is made up of two parts normally locked together by at least one radial screw with sized cross section. Under severe pulling stress applied to the union from the outside the locking screw breaks and frees the two parts of the union, which separate together with the pipes to which they are attached. Under normal working conditions elastically stressed sealing devices ensure maintenance of watertightness between the union parts.

Abstract: A weak point element for a cable head comprising a tubular ring having a circumferentially extending zone of reduced tensile strength between the ends thereof. Novel cable head assemblies which substantially isolate the weak point element from other than tensile stress are also disclosed.

Abstract: A composite connector assembly for easily and quickly making a connection between a flexible hose and an inlet fitting such as on a heat exchanger. The connector includes an elongated nipple-shaped fitting having an enlarged bead on its free end over which the hose end is extended during a connection. A cylindrical housing encircles the fitting and supports a radially outwardly distorted snap ring and associated spacer device maintaining the distortion so that the end of the hose can pass through the ring's center as it extends over and along a central body portion of the fitting. The housing includes a reduced diameter portion to engage the distorted snap ring to limit axial movement thereof as the hose is pushed over the body portion of the fitting. Resultant engagement between the axially inserted hose end and the parts of the snap ring spacer cause disengagement of the snap ring spacer from the snap ring allowing it to spring radially inward about the hose.

Abstract: A tamper discouraging system comprising, a catheter having an elongated shaft and a hollow connector at a proximal end of the shaft. The system has a drainage tube having an adapter at an upstream end of the drainage tube, with the adapter being received in the connector. The system has a first semi-annular shell for placement over the connector, and a second semi-annular shell for placement over the connector. The system has a hinge connecting one end of the first shell to one end of the second shell, and a locking device for locking the other end of the first shell to the other end of the second shell.

Abstract: An arrangement for rapid and simple push-in connection of one end of a hose, pipe or similar element. The outer surface of the end is made of a soft material into which at least one retaining device appertaining to the arrangement can be forced to retain the end inside the arrangement. The arrangement comprises an outer part, an insertion part disposed therein which bears the retention devices, and seals disposed in a cavity which can co-act with the external surface of the end. The insertion part has an inherent retaining or locking effect on the pipe or other element and a retaining position wherein it is movable in relation to the outer part. The seals comprise two sealing devices arranged one on either side of a guiding device disposed in the cavity. This guiding device is provided to guide the end while it is being pushed in. After the push-in connection has been made, the guiding element continues to center the end inside the cavity.

Abstract: A coupling unit comprising a first coupling part and a second coupling part. The second coupling part can be displaced longitudinally relative to the first coupling part by means of screw threads or the like. The first coupling part is equipped with a first nut-shaped section and the second coupling part with a second nut-shaped section. The second nut-shaped section has a cross-section measurement which allows passage of the internal surface of a tightening and/or loosening sleeve, when the latter is passed over the second nut-shaped section, to co-act with the first nut-shaped section.

Abstract: A pressure-assisted dynamic seal mechanism for sealing two relatively movable members within a tubing string in a well includes a primary seal member having a first cross-sectional area positioned for sealing engagement between the two relatively movable members. The primary seal is pressure-assisted by a back-up seal mechanism comprising a second seal member having a cross-sectional area greater than the cross-sectional area of the primary seal member and a third seal member having a cross-sectional area greater than the cross-sectional area of the second seal member. The pressures which act directly across the primary seal member also act in the same direction across the third seal member, whereas these pressures act in an opposite direction across the second seal member.

Abstract: End members for flexible connectors for bicycle pumps are provided, a first end member is fixed to one end of a flexible tube and to be connected to a valve of a tire and the second end member is to be connected to the other end of the flexible tube for connection to a pump. The first end member is made of one piece of molded construction and, at one side of a middle zone has an anchoring stub which carries a cap at its free and by means of at least two frangible bridges. At the other side of the middle zone the first end member has means for linking the connector with the valve of a tire. The middle portion also has resiliently deformable portions for holding the connector in a bore in the handle of the pump. For assembling the first end member with the tube, the cap is fitted over an end portion of the tube and, the bridges are severed and the anchoring stub is engaged inside the flexible tube.

Abstract: A first sleeve is connected to a second sleeve by means of a bellows. Brackets are arranged at the mutual circumferential distance along the circumferences of the sleeves which brackets are welded to the first sleeve at an end section thereof. The opposite end section of the brackets rest slidingly on the second sleeve. A clamping ring extends around the second end sections of the brackets at an inclined surface area thereof. This clamping ring is pushed onto these inclined surfaces and urges the end sections of the brackets against the second sleeve. The limiting of the stroke of the compensator is provided by circumferential rings welded to the second sleeve. The relative rotation blocking means is an elongated profile member which is welded onto the second sleeve and contacts a respective bracket.

Abstract: A remotely releasable pipe connector is described and comprises a first tubular connector or "pin connector" having at least one laterally extending locking member, and a slotted second tubular connector or "box connector" cooperatively disposable over the first tubular connector with the slots thereof removably engaging the first tubulars connector's locking members. One or more shear plates are attachable to the second tubular connector and are positioned to prevent the release of the locking members from the slots in the second tubular connector until the shear plates are subjected to a force greater than or equal to a predetermined force.

Abstract: A rigid connection for joining together two successive sections of a string of piling or the like includes a tubular box member, a pin member having a portion which projects into the box member, a locking member operable to releasably hold the pin and box members against separation, and a retaining element for holding the locking member in its active locking position. The locking member may take the form of a split ring having an interruption within which the retaining element is receivable to hold the locking member in an expanded locking condition. The locking member is preferably initially actuated to its locking condition by fluid pressure actuated means.

Abstract: A connector assembly for sterile connection of two internally sterile containers or tubings comprises two connectors (3, 4). The first connector (3) has a male part (5) inside a housing (6), a connecting device to connect the first connector to a first container or tubing (1), a first deformable barrier (7) spaced from the male part (5) and a chamber (8) between the male part (5) and the first barrier (7). The second connector (4) comprises a female part (9), a connecting device to connect the second connector to a second container or tubing (2) and a second deformable barrier (11) closing the female part (9). In connecting the connectors (3, 4) first both deformable barriers (7, 11) are brought into contact with each other after which the male part (5) of the first connector (3) is put through the second barrier (11) closing the female part (9) of the second connector (4).

Abstract: A universal connector for a fluid flow conduit comprises a tubular connector for attachment at one end to the fluid flow conduit and defining a luer taper tube portion at its other end. A sleeve is carried by and surrounding the tubular connector in relatively rotatable relation thereto. The sleeve defines internal threads for threaded locking connection with another connector. A tubular member having external threads at one end is locked by said external thread in removable threaded locking connection with the internal threads. The tubular member defines at its other end an aperture for sealingly receiving a spike connector.

Abstract: A plug to be temporarily located in a blocking manner within a pipe of a sewage pipe system of a building. The plug is to be installed within the pipe system as it is constructed. The plug is mounted within a flexible, enclosing wall, sleeve. The plug is constructed to be frangible and totally dissolvable within water. A clamping device is mounted exteriorly on the sleeve directly in the area of the plug. When the plug is no longer needed, the clamping device is operated to effect breaking of the plug and then disposing of the plug through the pipe system.

Abstract: A releasable coupling has opposite ends adpated to be connected into a tool string or tubing string and run downhole into a borehole. A sealing member is passed down through the tubing string and allowed to become seated within the axial passageway of the releasable coupling. Pressure is applied through the axial passageway above the sealing member whereupon the differential in pressure effected across the sealing member is also effected across a slidable piston reciprocatingly received within the releasable coupling. The piston moves into a position which enables a male member to be released and separated from a female member. When the male and female members are released and separated from one another, the lower part of the tubing string is disconnected from the upper part of the tubing string.

Abstract: A locking apparatus for positioning a well tool within a subterranean well bore and comprising a primary locking member attached to the well tool; a nipple incorporable in a subterranean well conduit; and running and retrieving tools for positioning the lock member is disclosed. The lock has a no-go shoulder for initially positioning the lock adjacent the nipple and radially expandable locking dogs for carrying both upwardly and downwardly directed forces upon full expansion thereof after the no-go shoulder has been disengaged. At least two interlocking members disengageable only by separate manipulations maintain the locking dogs in a radially expanded fully engaged position. A retrieving tool having a rotational alignment means to position the tool relative to the lock is used to separately manipulate the interlocking members and to pull the disengaged lock from the well.

Abstract: A portable adjustable washer cutter and improved sealing washer blank useful in telecommunications applications are described. The cutter comprises an essentially flat frame carrying a rotatable shaft and a platform placed opposite thereto for mounting a sealing washer blank in which a desired central opening is to be cut. An improved sealing washer blank having a small central opening and a small opening along its periphery can be easily mounted on the cutter by insertion of protruding members on the cutter through these openings. The sealing washer blank is cut by means of a blade mounted on a member attached to the bottom of the shaft. In a preferred embodiment, the sealing washer blank is provided with concentric annular ribs, the sealing washer blank being cut at a position between ribs.

Abstract: A modular nozzle system for refueling aircraft fuel tanks includes a nozzle valve linkage mechanism which permits the valve body to have a shorter length than previous designs. The nozzle may include a mechanical fuse for releasing the connection between the nozzle body and a fuel tank upon the application of predetermined forces. The nozzle may also include a swivel joint which facilitates positioning the nozzle for connection to a fuel tank. The nozzle may also include a quick disconnect assembly which facilitates connection of the nozzle to various hose end connection. The system also may comprise an assembly fixture for assembling the mechanical fuse and a test fixture for testing the release force of the mechanical fuse.

Abstract: An adapter union is disclosed which is especially useful for installation by butt welding on containers for fluids to permit a conduit of smaller internal diameter to be removably attached thereto, and also for certain other specialized uses described herein. The adapter union includes an improved butt weld adapter member. When desired, the adapter member may be installed on containers for fluids by butt welding to thereby permit a conduit of smaller diameter to be attached directly thereto. The disclosure further relates to containers for fluids having the adapter union and/or the adapter member installed thereon. When the adapter union is installed properly, the resultant structure provides for permanency of the installation when desired, and also allows future changes and modifications to be made easily and without damaging the adapter union and/or conduits or other cooperating apparatus attached thereto.

Abstract: A bursting disc orientation device comprises a cut-away portion (7) on a predetermined one collar (2) of the bursting disc unit and cooperable with the cut-away portion, a projection (8) e.g. in the form of an arm of an angle bracket (9) secured to the periphery, or integral therewith, of that pipe flange (5) against which the said one collar (2) is required to bear. Thus, the unit can be prevented from being located between the pipe flanges of the bursting disc unit in other than a predetermined orientation in which the projection (8) is located in the cut-away portion (7). This improves the safety of the device.