Abstract: A coupling device is used for joining two pipes. Each end of the coupling has a pair of adjoining grooves in its inner surface. Each groove has at its largest diameter a substantially flat portion located at its innermost end and then tapers in the direction of the coupling end. At the junction between the two grooves, the diameter of outermost groove is greater than the diameter of the innermost groove, forming a small circumferential ridge. An O-ring is initially set in the innermost groove and is compressed as the pipe is pushed into the coupling. The O-ring is further compressed as it rolls down the ramp of the inner groove as the pipe is partially retracted from the coupling. As the O-ring is pulled past the circumferential ridge between the grooves, it expands into the flat portion of the outer groove, forming a seal between the pipe and the coupling and a positive indication of sealing.

Abstract: A tubular joint including at least a pair of connection ports having an inner diameter substantially equivalent to an outer diameter of tubes to be connected, and a tubular connection part connecting the connection ports to each other. The connection ports each have a sealing member formed integrally thereon by extruding elastomer resin into a first recess formed around an axial line on an inner circumferential face of the connection ports, and the connection ports each have a fall-out preventing member coupled to an end part of the connection ports. The fall-out preventing member includes a ring-like member having an outer diameter sized for insertion into the connection ports, and a number of claws having leading edges located in a second recess formed around the axial line on the inner circumferential face of the connection ports and extending toward a center of the connection ports.

Abstract: A corrugated spiral pipe with a joint is formed by the steps of winding a seal material on thread portions of a pipe end of a spiral pipe, fitting a part of a cylindrical joint body to the pipe end so as to cover a portion on which the seal material has been wound, injecting a liquid foamable resin material through an injection hole and letting it foam, and filling a trough portion of the spiral pipe with the foamed resin material so as to make the spiral pipe watertight for coupling purposes. When the spiral pipe with the joint is coupled to another spiral pipe, a waterstop is forced into a trough portion of a pipe end portion of the latter pipe, an elastic seal ring is fitted onto an outer peripheral face of the latter pipe, and the pipe end of the latter pipe is forced into an outward protruded portion of the joint body.

Abstract: Contracting/expanding self-sealing cryogenic tube seals are disclosed which use the different properties of thermal contraction and expansion of selected dissimilar materials in accord with certain design criteria to yield self-tightening seals via sloped-surface sealing. The seals of the subject invention are reusable, simple to assemble, adaptable to a wide variety of cryogenic applications.

Abstract: A technique for joining a larger and a smaller pipe wherein the smaller pipe has an outside diameter smaller than the inside diameter of the larger pipe. An inner and an outer gasket are used to form the joint. The inner gasket has an inclined outer surface forming a wedge shaped profile and is stretch fitted over the smaller pipe. The outer gasket has a portion of its inner surface matched to the inner gasket outer surface and is compression fitted into the inner surface of the larger pipe whereby the portion of the smaller pipe having the inner gasket is encased by the larger pipe. The smaller pipe is then pulled away from the larger pipe until the inner gasket wedges against the outer gasket forming a locked sealed joint.

Abstract: An interconnection system for pipelines and other oil country applications enables the parent metal of internally coated or lined pipe to be free of thermal and mechanical stresses that degrade the coatings or linings. A male member having an internal lining and a female member into which the male member is to be fitted each have internal circumferential grooves into which open loop snap rings are locked. By arranging grooves and snap rings of progressively changing axial lengths, a number of rings are deployed in a given installation, since rings preinstalled in the female member pass over smaller grooves in an inserted male member until all contrast into position at the same time. In a pin and box combination, the nose ends of the pins compress a central seal ring that is internally flush with the pin linings. The central seal and O-rings seated in the box and engaging the pins block passage of internal presurgical gases and corrosive materials.

Abstract: A resuscitator apparatus including a resilient, self-inflating squeeze bag having a single combined inlet/outlet which is preferably removably connected to a first manifold. The first manifold includes an outlet coupling adapted for connection to a first end of a tubular connector. The tubular connector is desirably formed as a short, kink-resistant, flexible hinge member. The flexible member is desirably fabricated as a one-piece article and may be formed of any suitable flexible material, with a preferred material being injection molded polyvinyl chloride (PVC). The flexible member includes two socket portions at each end of the flexible member for receiving first and second tubular fluid carrying conduits, a deflection resistant intermediate region and deflection sites possessing lower moments of inertia than that of the intermediate region. The intermediate region is preferably in the form of at least one crush-resistant, radially outwardly projecting flange.

Abstract: The device for connecting a length of duct to a coupling endpiece of an apparatus or a member includes at least one tubular sleeve having two portions in axial succession, the first portion being internally fitted with components of an instant connection coupling for the end of a length of duct, the second portion including means for sealably and releasably covering the coupling endpiece, the end face of the endpiece forming an axial abutment at the end of the length engaged in the first portion of the sleeve.

Abstract: The quick connector for joining pipes having grooved ends has a circlip which normally is of a diameter greater than that of the associated pipe, and which is contracted and locked in the contracted condition, the inner diameter of the circlip at that time being less than the diameter of the pipe, and the outer diameter of the circlip at that time being greater than the diameter of the bore of the connector, the circlip when in a contracted position, locking the connector against removal from the pipe.

Abstract: A pipe joint capable of transmitting high axial compressive loads includes a reduced wall thickness section at the ends of the pipe to be joined and a coupling sleeve supported in telescoping relation with the reduced wall thickness section. Shoulders formed at the ends of the reduced sections bear against the ends of the sleeve, and the ends of the reduced thickness sections bear against each other so that a portion of the axial compressive load is transmitted through the coupling sleeve and a portion through the reduced thickness sections and a substantially uniform unit stress is maintained. O-rings carried by the coupling sleeve provide a fluid-tight seal between the sleeve and the adjacent surface of the reduced thickness section of the pipe.

Abstract: A pipe coupling comprises an annular sleeve member arranged in use at a free end thereof to overly an end of a plain ended pipe to be connected by the coupling, the free end of the sleeve member being inclined radially outwardly towards its end; an elastomeric annular sealing gasket disposed at least partly within the inclined free end of the sleeve member and held in place by an annular compression flange member; the compression flange having a skirt portion, axially outwardly, and an axially inwardly extending collar portion radially outwardly overlying the free end of the sleeve member; the gasket including, when in a relaxed condition, an axially outwardly directed rear surface arranged in use to engage an axially inwardly directed face of the annular radially inwardly extending portion of the flange member, a radially inner surface extending generally axially inwardly of the coupling from a gasket heel to a gasket toe, and an inclined surface extending generally between the two above mentioned surfaces o

Abstract: A duct coupler is disclosed for joining and sealing between adjacent sections of duct. The coupler includes a body, flexible cantilevered sections on the end of the body adapted to pass over annular protrusions on the duct and locking rings for locking the cantilevered flexible sections into position, so as to lock the coupler onto the duct.

Abstract: A plastic coupling for plastic tubing having a groove annulus formed between a first circumferential groove on the outer periphery of the enlarged diameter portion of a connection tube and a second circumferential groove on the inner periphery of a cap nut 5 when the cap nut 5 is mounted on a joint body, and an enlargeable split ring having an internal diameter smaller than the external diameter of the enlarged diameter portion and loosely fitted into the second groove, the split ring being adapted to slide on the enlarged diameter portion to the first groove until the split ring falls within the first groove and is located within the groove annulus when the cap nut is mounted on the joint body.

Abstract: A pipe joint incldues joint main body having securing through holes respectively formed at positions spaced apart from the two ends of the joint main body by a given distance in the longitudinal direction thereof for securing hook portions, and a plurality of flange bodies each including hook portions respectively formed on one end side thereof to be inserted and secured to the respective securing holes and a flange portion formed on the other end side thereof and having a connecting hole.

Abstract: A rubber hose is coupled to a metal tube by a connector having an inner tubular component which is fixed within an internally threaded sleeve and which telescopes into the end portion of the hose. An externally threaded sleeve is rotatable on the end portion of the hose and, when tightened into the internally threaded sleeve, engages a nut on the end portion of the hose to force the tube axially onto a frustoconical portion of the tubular component and establish a seal around the hose. The thread of the nut is of opposite hand from the threads of the sleeves to prevent the nut from running off of the hose if the nut is turned during tightening of the externally threaded sleeve.

Abstract: The invention describes a pipe for carrying fluid, including thermally insulated steel pipe sections of a type including an outer tubular shell, an inner cylindrical shell of smaller diameter, in the inner shell being sealingly welded to the outer shell at each of the ends of the pipe sections. It is characterized in that at each joint, the ends of the two inner shells are welded to each other, and a sleeve links to the ends of the outer shells so that when traction, compression or bending forces are exerted on the pipe, the said sleeve transmits these forces to the outer shells.

Abstract: A coupling for no-hub pipe segments has a shield covering an elastomeric gasket. The shield has a plurality on corrugations oriented transverse to the pipe axis and arranged in discrete areas. These corrugations are separated by corrugations oriented parallel to the pipe axis arranged in discrete areas. Clamping bands securely clamp the shield and gasket to the pipe segments. The pattern of corrugations permits the shield to assume a shouldered shape when the clamping bands are tightened and the coupling is installed on pipes of slightly varying diameter. The gasket is provided with a pattern of thick sealing sectors and adjacent groove sectors laterally spaced relative to thick sealing sectors. This pattern permits the clamping bands and shield to form a restriction impeding the movement of the shield relative to the gasket when the clamping bands are tightened.

Abstract: A pipe fitting or coupling is used for connecting at least two pipes. The pipe fitting is basically formed of a coupling main body and a slit ring integrally formed together. The coupling main body is formed of an inner layer of good heat resisting property, an intermediate layer containing glass fibers, and an outer layer having large tensile elongation and impact strength. The slit ring is formed at an edge portion of the outer circumferential surface of the coupling main body.

Abstract: A friction sealed coupling assembly (10) for connecting sections of pipe (P1, P2) having a connecting sleeve (12) and a pair of opposed draw sleeves (14, 16). The connecting sleeve is formed of a hollow cylinder (24) having a uniform inner diameter (D2) and an outer diameter that decreases from a midpoint (M) toward each open end (26, 28) resulting in diverging external tapers (T1, T2). One of the draw sleeves is placed over each taper of the connecting sleeve, each draw sleeve having a uniform outer diameter and an inner diameter that decreases from the first end to the second end creating an inner taper. The inner wall of each draw sleeve is oppositely tapered to the corresponding connecting sleeve end. Each draw sleeve has a bolting flange formed at one end. Ends of the sections of pipe to be connected are first inserted in each end of the connecting sleeve. The opposed draw sleeves are drawn together by tightening connecting bolts (22) so the sleeves move toward each other.

Abstract: A length of corrugated tubing is (B) inserted into a bell (C) having an open end 42. The corrugated tubing is defined by alternating annular portions peak (22) and valley portions (24) and a cylindrical inner wall (26) connected with an inner surface of the valley portions. Annular chambers (28) are defined between the cylindrical inner liner and each peak portion. The bell has a stop (10) and a cylindrical side wall (40) with a groove (44) for receiving a gasket (30) that is disposed in one of the tubing valleys. The groove is constructed an integer number of peak and valley portions from the stop such that the gasket aligns with the groove when an end of the tubing length abuts the stop. A plurality of latch elements (60) are disposed an integer number of peak and valley portions from the gasket receiving groove toward the bell open end. The latch elements extend into another of the valley portions and engage a corrugation side wall to transfer axial uncoupling forced from the tubing to the bell side wall.

Abstract: A corrugated spiral pipe with a joint is formed by the steps of winding a seal material on thread portions of a pipe end of a spiral pipe, fitting a part of a cylindrical joint body to the pipe end so as to cover a portion on which the seal material has been wound, injecting a liquid foamable resin material through an injection hole and letting it foam, and filling a trough portion of the spiral pipe with the foamed resin material so as to make the spiral pipe watertight for coupling purposes. When the spiral pipe with the joint is coupled to another spiral pipe, a waterstop is forced into a trough portion of a pipe end portion of the latter pipe, an elastic seal ring is fitted onto an outer peripheral face of the latter pipe, and the pipe end of the latter pipe is forced into an outward protruded portion of the joint body.

Abstract: A clip for providing end to end connection between a rigid and a flexible hydraulic pipe comprises a base by which it may be attached to a workpiece, a frame portion extending upwardly from the base having a circular bore, which can receive a rigid pipe as a force fit, and a hexagonal bore which may receive a flexible pipe and hold it against twisting and clamp means on the base to embrace the flexible pipe and hold it in position.

Abstract: A fluid coupling provides a cap nut having an internal screw formed inside, a pipe having a mirror-finished surface formed at an end face and a groove in an outer periphery, a device for preventing rotation of the pipe together with the cap nut, in contact with the inner end face of the cap nut, a ferrule fitted in the groove formed in the outer periphery of the pipe, in contact with the device for preventing the rotation of the pipe together with the cap nut, the ferrule which transmits to the pipe a thrust of the cap nut in the pipe's longitudinal direction, a gasket fitted on an end part of the pipe, with the end face of the pipe in contact with the gasket through the entire circumference, and a body mirror-finished at the end face and provided with an external screw formed on the outer periphery, wherein the end face of the body is in contact with one side of the gasket the other side of which is in contact with the pipe, and the external screw of the body and the internal screw of the cap nut is tightene

Abstract: A method of joining conduits includes using a coupler, which includes a pliable tubing and a pair of end sleeves. The coupler is attached to the ends of a pair of conduits by flexing the tubing to cause the coupler to flex into proper alignment and connection with the conduits.

Abstract: A beverage dispenser provides uniformly chilled carbonated beverages during peak demand and off-peak demand. The dispenser includes a soda and syrup chiller, beverage dispensing heads and a vacuum insulated tower assembly between the chiller and the dispensing heads.

Abstract: Flexible assembly designed for coupling flexible tubes comprising a sleeve (1) designed to receive the ends of two tubes to be coupled and provided with assembly means designed to cooperate with complementary assembly means carried by the ends of said tubes, characterized in that the assembly means of sleeve (1) have an annular chamber arranged in the inner wall of the sleeve, and whose edges form shoulders with reflex angles (3, 3') giving to it, in axial section, a dovetailed profile, and in that the complementary assembly means carried by tubes (7, 8) to be coupled are made up of tubular stops (5) permanently attached onto the ends of tubes (7, 8), the stops having an outer diameter corresponding to the inner diameter of the annular chamber arranged in sleeve (1) and at least their edge designed to cooperate with the corresponding shoulder with reflex angle of the chamber having a complementary inclined profile (6) of that of shoulder (3) with reflex angle, and in that the length of the annular chamber is

Abstract: Pipes to be joined and a pipe coupling have an outer sleeve made of a material optimized for linear and radial strength and positive connection and an inner portion or liner optimized for chemical inertness and the tightness of the connection. The pipes and coupling part are shaped to accommodate a material-correct joining procedure. Compound pipes (1) have a rigid, relatively thin pipe outer sleeve (3) for absorbing and transferring forces and a softer, relatively thin liner or inner pipe (4) to form a tight connection and inert sealing with respect to the rigid outer wall. Like the pipe, the coupling part (2) is made of a rigid joining outer sleeve (5) and a weldable socket (10), preferably made of the same material as the liner (1). Welding energy is introduced electrically.

Abstract: A metal fitting (11) for an end of a plain length of pipe (12) comprises a body (13) with flange means (14) adjacent a first end (15), a gland ring (16) adjacent the other end (17) of the body, a grip ring (18) between the body (13) and the gland ring (16), and screw fasteners (19) for urging the gland ring (16) towards the flange means (14); characterised in that:the body (13) has an integral outer tubular spigot (20) projecting towards the gland ring (16) and a co-axial integral inner tubular spigot (21) having a cylindrical outer surface (22) projecting beyond the free end (23) of the outer tubular spigot (20), the inside (24) of the outer spigot (20) being provided with a frustoconical portion (25) adjacent and converging from that free end;the gland ring (16) has its inside provided with a similar frustoconical portion (26) converging in the opposite direction;and the grip ring (18) is a split ring having external surfaces (27, 28) mating with the frustoconical portions in the body (13) and the gland rin

Abstract: A pipe coupling arrangement is directed to a coupling body fitted on at least one of a pair of pipes to connect the pipes with one another. The coupling arrangement includes a protruded portion formed on the outer periphery of each of the pipes, an annular sleeve having an inner wall therein being engageable with the protruded portion, the sleeve being provided in a space between the outer periphery of the pipe and the inner periphery of the coupling body, a threaded hole inwardly and slantingly formed in the coupling body closer to one end thereof for arresting the slipping off of the sleeve from the coupling body, a cut-away face formed on the outer periphery of the sleeve, the cut-away face having a tilt angle perpendicular to that of the threaded hole, and a fastening member screwed into the threaded hole such that the tip portion of the fastening member can abut against the cut-away face.

Abstract: The coupler consists of an essentially cylindrical outer layer of glass fiber-reinforced plastic and an inner layer consisting of polyurethane. This inner layer has, approximately in the middle between the two coupler ends, a rib which serves as a stop for the ends of the two pipes to be connected to one another. The coupler has, between this rib and one coupler end (a), an approximately conical inner shape which has a diameter which increases in an outward direction, this conical surface also being provided with two sealing beads.

Abstract: A thin pipe connecting joint comprises: a joint body including retaining walls bent individually from the two end portions thereof, and an assembly hole extending through the axis thereof; and a pair of pipes including engagement walls formed at their end portions to be connected and adapted to be brought into abutment against each other, elastic seal ring members assembled on the individual back faces of the engagement walls, and a socket member inserted on the back of one of the elastic seal ring members and having a plurality of protruded tongue walls opened backward. When the engagement walls of the pipes are assembled in the assembly hole of the joint body, the other of the seal ring members is retained on the retaining wall at the same side, and the one of the seal ring members is pushed and held by the socket member so that the pipes are connected by retaining the tongue walls of the socket member on the retaining wall at one side of the joint body.

Abstract: To connect two sheaths (1a, 1b), used in prestressing cable technology for concrete supporting structures, there is a coupling element (19) which is fitted with chamfered flanges (6). The sheaths (1a, 1b), which have protrusions (2a, 2b), are each inserted into the coupling element (19) with a tubular element (4) which forms the end of the sheaths (1a, 1b). A sealing ring (7) is inserted between each of the flanges (6) and protrusions (2a) of the sheaths (1a, 1b). The flanges (6) and the protrusions (2a) are held together by sloping surfaces (10a) and (10b) of a groove worked in each socket (8). Each of the sockets (8) consists of two half portions (8a) and (8b), which can be connected together.

Abstract: A pipe coupling, comprising a sleeve having at least one end adapted for the insertion of a pipe and being provided with a substantially conically shaped supporting surface for a sealing ring. A compression ring is provided by which the sealing ring may be compressed around the pipe. The sealing ring is composed of a circumferentially compressible, but in cross section rather undeformable annular core, which is more particularly bent of a helical body having substantially circular windings, and a sheath of elastomeric material which forms the actual seal. The sheath completely encloses the annular core both cross sectionally and circumferentially. The supporting surface has a progressively decreasing diameter in the pressing direction.

Abstract: This invention relates to a device for coupling lengths of metal pipe, too hard or to thin for cutting a screw, by inserting a screwed socket in one end of the pipe to be joined with another, expanding that part of the pipe, and joining it airtight with another coupling.A metal pipe coupling of the present invention has a screw section and a tightening section, and is shaped so as to be suitable to the way of coupling metal pipes by insertion of one end of a metal pipe in the coupling, expanding the fastening section of the metal pipe so that the joining of the outside circumference of the pipe and the inside circumference of the coupling should be airtight, and thereafter by joining with another joining material.

Abstract: This invention is a pole splicing joint construction and method of making the same and consists in initially preparing the upper end portion of the lower pole section to produce a splicing section having an abutment shoulder for the lower end of the upper section. This abutment shoulder is formed at the bottom of the splicing section of the lower pole section which has an outer abutment ring surface lying in a plane oriented substantially normal to the axis of the lower tube section.

Abstract: The seal (4) has an annular body (10) with a generating section which is substantially rectangular and with an inner cylindrical surface (18) having a diameter (d1) substantially equal to the nominal diameter of the tubing (2) to be connected to the coupling (1). The seal (4) has a rib (20) projecting radially inwardly and having an inner diameter (d2) less than the outer diameter (d1) of the tubing. The seal also has an annular lip (24) which projects axially and has an inner surface with a diameter (d3) intermediate the internal diameter (d2) of the radial rib (20) and the diameter (d1) of the inner surface (18) of the seal (4).

Abstract: A pipe coupling system including a modified collar (12) into which a first pipe (40) and a second pipe (30) are inserted. In a first embodiment, a ring (22) resides within the collar which can serve as a torque shoulder or a metal to metal seal. In a second embodiment, a composite element (22') is formed of three concentric rings, a first ring (41) being composed of a Teflon.RTM. like material, a second ring (44) being composed of a Torlon.RTM. or Peek.RTM. like material, and a third ring (42) composed of a Teflon.RTM. like material. The adjoining surfaces (60,61) of the rings (41,42,44) form leakage paths to relieve accumulated pressure within the collar thread voids (51). A slip on gauge (52) is disclosed for prescreening pipe to insure that it is within the tolerances required for the present system. A bucking plug (8) is disclosed for insuring that the first pipe (40) is inserted within the collar (12) to the proper depth.

Abstract: A pipe connector includes an externally threaded connecting tube having an annular flange around the inside wall thereof on the middle, two pipes respectively inserted into the connecting tube and stopped against the annular flange at two opposite ends, two locknuts respectively threaded onto the connecting tube at two opposite ends to squeeze two tapered split ring against the pipes causing them to be locked in place, and two water seal rings respectively stopped between the connecting tube and the tapered split rings to seal the gaps.

Abstract: A composite sleeve A serves as an impermeable coupling between pipes T1 and T2 having smooth, uniform ends. The sleeve comprises a rigid binding ring B acting as a jacket for a flexible, elastic and reversible collar C, which is attached to the binding ring by a pair of toric retaining rings D which press the collar C internally against the binding ring at zones of contact 13 in proximity to the ends of the binding ring, while creating, between the contact zones, an annular space 14 between the collar and the binding ring. The coupling connects collection pipes used for gravitational sanitary drainage, and is impervious to internal and external pressures.

Abstract: A concrete conduit is completely encased within a shell of a plastic resin such as polyethylene. The plastic shell functions to insulate the concrete conduit from mechanical shocks thereby preventing breakage and cracking of the conduit. The shell also effectively provides an impermeable barrier for water vapor and a smooth, relatively frictionless, surface for receiving electric cables, wires and the like. The conduit is made by preforming the shell, for example by rotational molding, and filling the shell with pourable cement through a filler hole in the shell. The filler hole can then be closed with a plug of the resin used to form the shell.

Abstract: A composite fiberglass tubular coupling comprising an elastically deformable liner. The interior surface of the liner is threaded inwardly from each opposite end. A plurality of buttress ridges are located on the exterior surface of the liner and the exterior surface of the liner is overwound with thermoset resin impregnated fiberglass reinforcing fibers.

Abstract: An improved pipe jointing system includes sections of pipe having annular grooves about each of the ends thereof and a coupling having a rigid outer layer and an elastomeric inner layer fixedly secured thereto. The inner layer has a medial, inwardly directed lip and a pair of opposing sets of sawtooth ridges, one set disposed on each side of the lip. A pair of the pipes inserted into opposing ends of one of the couplings in end-to-end relationship compresses the respective lip therebetween forming a fluid-tight seal between the coupling and the pipes. The grooves are adapted to receive respective ones of the sawtooth ridges such that axial movement of the pipes relative to the coupling is resisted. A modified embodiment provides a pipe and coupling system whereby an elastomeric inner layer of the coupling creates sufficient frictional force to resist axially outward movement of the pipes relative to the coupling.

Abstract: A conduit coupling device includes a tubular casing with front and rear sections of reduced and enlarged diameters. A pair of relatively diametrically movable arcuate clamp members of channel shape with cross webs and flanges is provided, one of the webs having peripherally extending tongues slidably engaging the other clamp member channel. A radial screw engages a tapped bore in the casing rear section and bears on and is clinched to one of the clamp member webs the other clamp member being fixed to the casing. A pair of the casings may be integrally coaxially formed and house similar clamp assemblies or the casing may terminate in an externally threaded coupling tube projecting coaxially forward from the casing front section.

Abstract: A pipe joint having a pipe (11) including an outward facing flange (17), a joint body (10), and a tubular fixture (20) covering an outer peripheral part of the joint body (10) and coupling to the pipe (11) with joint body (10). The tubular fixture (20) is composed of springy claws (25) and an inward facing flange (21), so that an assembly work can be simplified and a manufacturing cost can be reduced owing to a decrease in a quantity of parts.

Abstract: A coupling for joining two tubes is manufactured of a material different from the material of the tubes. The coupling includes two parts, which can be coupled to each other. Each part includes a body with an axial bore for receiving an end of the tube. The bore has an inner wall including a ring. The ring is made of a material which can adhere to the material of the tube. Two tubes made of different material can thus be coupled and uncoupled.

Abstract: A pipe joint consists of a sleeve (2) surrounding a socket chamber (3) for receiving a spigot (5). A gland (9) extends into the socket chamber (3) against a heel portion (12) of a sealing ring (7). Axial movement of the gland (9) forces the sealing ring (7) and causes a leading nose portion (14) of the sealing ring (7) to be deflected radially inwardly by the internal profile of the sleeve (2) against the external surface of the spigot or pipe end (5), thereby forming a seal. The heel portion (12) of the seal ring (7) maintains substantially the same radial position in the socket (3).

Abstract: A multiple duct conduit system (10) includes conduit sections with elongated outer ducts (18) and inner ducts (19) are disposed therewithin and the conduit sections are connected in end-to-end relationship for carrying fiber optic cables and the like. The inner ducts (19) are formed of a material having a coefficient of thermal expansion which is different from that of the outer ducts and the inner ducts expand and contract with respect to the outer ducts as temperatures change. Couplings (16) connect the ends of the conduit sections and define passageways (31-34) constructed with expansion chambers (48) to accommodate changes in the lengths of the inner ducts (19) with respect to the outer ducts (18).

Abstract: An improved method of coating a pipe coupling with a corrosion resistant polymeric coating includes coating an entire coupling, then simultaneously forming an upstanding flange on the coupling body when, in the parting process, the body and nut are separated. The improved coupling is adapted to utilize a moisture barrier between thee nut and the flange.

Abstract: To produce an integrated coupling on pipes manufactured according to the centrifugal casting process, insert rings made of soft PVC are placed into the end parts of the pipe shell mode. In the recess (5a) of one end part (4a), a coupling sleeve (7) is produced by wrapping on a laminate. A recess (5b) provided with an additional annular groove (5c) is produced by the insert ring in the other pipe end part (4b). A prestressed sealing ring (8) is placed into the groove (5c). Projecting beads (8a, 8b) of the sealing ring (8) are compressed by the coupling sleeve (7) on coupling the pipes. The material of the sealing ring (8) that is now being displaced finds space in annular flutes (8d) provided on the inner side of the sealing ring. This integrated coupling is suitable for nonpressurized pipelines and especially for pipes intended for lining reinforced concrete or concrete pipes.

Abstract: A screwed pipe joint with a bell for connecting two pipes of a drill pipe string.