Abstract: The present electrical conduit coupling includes an electrical conduit coupling 10 and a lubrication fitting 11 thereon. The coupling includes a hollow body 12 including an external surface 13 and an internal surface 14. The internal surface defines a central bore 15 extending between first and second open ends 17, 19 that are adapted to receive conduit ends. A thickness dimension exists through the hollow body between the internal and exterior surfaces 13, 14. The lubrication fitting 11 is provided on the hollow body 12 between the first and second ends 17, 19. The fitting 11 extends at least partially through the thickness dimension to communicate with the central bore 15. The lubrication fitting 11 includes an internal one way valve 31 that permits injection of a lubricant into the central bore 15 but automatically closes to prevent reverse flow of lubricant outwardly through the fitting 11.

Abstract: A reusable sealed coupling for joining a first pipe having a first internal diameter adjacent a first end thereof which is substantially equal to an outer diameter of a second pipe, the coupling comprising: a coupler capable of receiving the first end of the first pipe within a first portion thereof and an end of the second pipe within a second portion thereof so that the coupler, second pipe, and first pipe achieve mutual overlap in at least one region. The first and second pipes are both set into predetermined positions with respect to the coupler and with respect to one another; and a seal between the coupler, second pipe, said first pipe is created in at least a portion of the region of mutual overlap.

Abstract: A coupler for securing at least one pipe having a planar end. A hollow rigid coupler shell and a rigid tube stiffener are secured in the shell by a hub member, the stiffener having an external diameter less than an internal diameter of the pipe. The hub member has an internal diameter less than an external diameter of the pipe, the hub member having at least one tubular extension which will engage the pipe planar end. The coupler shell has a narrowing internal portion with a separate straight internal portion. At least one hollow follower is provided in the coupler shell straight portion adjacent the hub member tubular extension and at least one flexible hollow boot is movably retained within the coupler shell internal straight and narrowing portions, with a plurality of serrations being provided on an interior surface of the boot.

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 coupling assembly having an annular coupling with internal threads having a continuous plastic, corrosion-resistant coating. Opposed tubes are provided with a similar internal coating. The tubes have external threads inserted into the coupling with the internal and external threads being in threaded engagement. An annular gasket is provided of rigid material and is mounted between and in sealing engagement with opposed ends of the tubes within the coupling. The gasket has a continuous radial portion extending between the opposed ends of the tubes and in spaced apart relation thereto. O-rings are in sealing engagement with the tubing ends and the continuous radial portion of the gasket. A pair of opposed flanges extend from opposite sides of the continuous radial portion of the gasket and are in sealing contact with an interior surface portion of the tubes.

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 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 split connector for joining pipe elements insitu including a first pipe element and a second pipe element positioned in a structure, a pair of matched semi circular body elements of semicircular construction adapted for forming a generally circular coupling connector having a cylindrical body and including an internal facing surface divided at the mid point, the first half adapted to engage a tubular end of the first pipe element and the second half adapted to engage the second pipe element, having wedge, members for connecting the first body element to the second body element and a pair of female grooves on the second half cylinder for forming a unitary axially-split collar having water tight seams; and including an internal shoulder capable of engaging a lug the first pipe section with fastening provided by adhesive applied to the pipe ends and the facing surfaces of the split connectors for providing a watertight seal and structural strength of the piping components; wherein the pair of matched semi circ

Abstract: A coupling sleeve for connecting thin-walled the ends of pipes comprising a circularly bent sheet-metal strip and a sealing strip lining the inside thereof. A turnbuckle on the sheet-metal strip causes the coupling sleeve to be tightened against the pipe ends. A loosely attached spacing member located approximately at the axial middle of the coupling sleeve in the region of the turnbuckle has an end that projects through the sealing strip into the interior of the coupling sleeve in the untightened condition and is pressed outward, during the tightening of the turnbuckle by an end of the sheet-metal strip and is forced into the elastic inside surface of the sealing strip or into a slit in the sealing strip.

Abstract: A flexible pipe connector is disclosed having two female ends, each for receiving a length of corrugated pipe and creating a gravity flow water-tight seal between the two lengths of corrugated pipe. The flexible pipe connector is made of flexible, stretchable plastic material, with each female end having a receiving length with a mouth at a first end thereof and a stopping flange at a second end thereof. Each female receiving end is constructed to stretch radially outward along a substantial length of the corrugated pipe which is inserted into the mouth and receiving length, such that the receiving length exerts radially inward compressive forces against the outer diameter of the corrugated pipe effectuating a gravity flow water-tight seal. The invention also includes a male-to-female form of connector having a female end and a male end, which coupler is adapted to be used to connect a corrugated pipe to a flexible seal member of a drop box and is able to receive a speed leveling device.

Abstract: A pipe coupling having an elastomer sealing sleeve which is approximately C-shaped in cross-section has a cylindrical housing which is split in the longitudinal direction, and which defines inwardly bent end walls and can be constricted like a pipe clip by means of a closure having tensioning screws, in which arrangement the sleeve, which is enclosed at the end faces and at the circumference by the housing and by a metal insert sheet bridging the housing gap and is approximately C-shaped in cross-section, is compressed in the circumferential direction and is brought to bear against the pipes to be coupled. Sliding rings, which are compressible in the circumferential direction, are located between the end faces of the sleeve and the end walls of the housing. Upon assembly of the coupling, these sliding rings are brought to bear against the outer walls of the pipes and form a sliding seat with the latter.

Abstract: A gas-tight pipe connection includes a sleeve which has two internal thread portions which extend from the ends of the sleeve to a thread-free portion located in the middle of the sleeve. The sleeve includes a radially inwardly projecting web located in the middle of the thread-free portion and extending over a certain width. The web has end faces constructed as contact shoulders. A sealing portion each is provided between the internal thread portions and the contact shoulders. The connection further includes two pipes, each of which has in an end portion thereof a threaded portion constructed complementary to the internal thread portion of the sleeve. Each pipe also has a contact shoulder and a sealing surface arranged between the contact shoulder and the threaded portion. A tight metal seat is formed between the sealing surface of the pipe and the sealing portion of the sleeve.

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 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 coupling ring for circular ducts is formed of a single piece of sheet metal and has oppositely extending flanges connected together by an annular channel-shaped rib which cooperatively with the flanges defines oppositely opening grooves containing sealant. The relative dimensions of the grooves is such that a hydraulic lock is avoided at the time the coupling ring is telescoped onto the ducts. Proper sealing can be visually determined by inspection.

Abstract: A pipe coupling has a housing which is split in a longitudinal direction and has inwardly bent end walls and a steel insert sheet of analogous design bridging the housing gap. With the aid of a closure with tensioning screws, the housing can be constricted in the manner of a pipe clip. A sleeve, enclosed at the end faces and the circumference by the housing and a steel insert sheet, and roughly C-shaped in cross-sectionis compressed in the circumferential direction and is brought to bear on the pipe wall. As a result of inherent recovery capacity, an annular insert, flexible in the circumferential direction but rigid transversely thereto, bears on the sleeve web and thereby holds the sleeve web in surface contact with the housing even when the coupling is pressure less. In combination therewith, sliding rings are preferably located between the end faces of the sleeve and the end walls of the housing, which sliding rings close the annular gap remaining between the end walls of the housing and the pipe wall.

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: The assembly arrangement according to the invention concerns the tubes which are used primarily in oil industry installations. It permits the sealing assembly of a male end to a female end, each provided with frustoconical screwthreads.The end region of the male component comprises a convex frustoconical sealing surface for providing a metal-metal sealing connection with a surface of the female component, the internal edge of which is connected to the concave frustoconical abutment region and the external edge of which is connected to the external surface of the end region, having a portion parallel to the generatrix which is tangential to the bottom of the threads of the male screwthread. The diameter of the external edge is such that the prolongation of the generatrix which is tangential to the thread bottoms of the male screwthread passes beyond said external edge.Use for the assembly of tubes with male ends by means of female sleeves.

Abstract: A threadless coupling for pipes has a cylindrical coupling body having longitudinally-extending slots or sections along the entire length thereof, a pair of grip sections forming grooves facing oppositely from each other on the outside of the edges of both ends of the opening section of the coupling body, and a grip case which is slidable fitted for coupling on the pair of grip sections. The grip case is tapped with a hammer of the like to slide onto the pair of grip sections, thereby compressing the coupling body around the conduits to be coupled by decreasing the gap between the pair of grip sections and accordingly reducing the diameter of the coupling body.

Abstract: A connector for joining the ends of two pipes has a pair of half-sleeves, which fit around the pipe ends to form an inner sleeve. The inner sleeve has a tapered or conical outer surface, against which an outer sleeve presses. The outer sleeve is a single-piece sleeve with a tapered bore, the angle of the taper of which matches the angle of taper of the outer surface of the inner sleeve. The outer sleeve is slid over the inner sleeve and is clamped in intimate contact with the inner sleeve by a nut which is tightened onto a threaded end of the outer sleeve while an annular, inwardly - projecting flange of the nut bears against the ends of the half-sleeves. The surfaces of the half-sleeves are coated with adhesive before being placed around the pipe ends; this adhesive cures while the joint components are clamped together. Preferably each half-sleeve has a central rib at its mid-point, against which the ends of the pipes being joined abut.

Abstract: A pipe coupling is described suitable for joining together drainage, or other, plastic piping through a poured concrete layer, typically a floor. The coupling permits precise location of fittings, such as a toilet flange, after the concrete has been poured and set.

Abstract: The conduit sections of a multiple duct conduit system each include a coupling assembly 15 mounted at one end of each conduit section 10, with the coupling assembly including an outer cylindrical coupling 24 and an inner coupling 25. The inner coupling includes an inner receptacle 45 having a support plate 40 with sockets 44 and 45 mounted to both sides of the support plate in alignment with openings in the support plate. O-rings 55 are seated in annular grooves 54 of the passageways formed by the sockets, and internal flanges 48 project inwardly of each passageway. When the conduit sections are connected in end-to-end relationship, the protruding inner ducts 12 of one conduit section 10B are moved into the coupling assembly 15 until the inner ducts 12B are moved into the inner coupling assembly 25, whereupon the relatively small openings 45 of the O-rings 55 are stretched so as to permit passage therethrough of the inner ducts 12. This forms a seal about the inner ducts.

Abstract: A soil pipe coupler. There is an annular portion formed from an elastomer having a hardness of 95 on the Shore Durometer A Scale. A ridge is formed about the portion's inner surface to be inserted between the ends of the two pipes to be coupled. A clamp means is included and clamping sleeves formed from an elastomer having a hardness of 95 on the Shore Durometer A Scale are formed integrally with the annular portion. The clamping sleeves extend axially from either side of the annular portion to overlap a length of each pipe to be joined. Each of the clamping sleeves is formed with an annular groove on the outer surface to position a clamp. The annular grooves have a ridge to support a clamp whereby the pipes to be coupled are inserted into the clamping sleeves until the pipe ends abut the ridge of the annular portion. The clamping means are tightened to shrink the clamping sleeves about the pipes to be coupled.

Abstract: Threaded oil well pipe joint comprising a coupling having internally threaded ends and an intermediate unthreaded area with substantially greater cross section area. The internally threaded ends are made up with externally threaded ends of pipe. Stresses resulting from joining either end of the coupling to a pipe section are absorbed by the intermediate area so that such stresses will not affect the opposing end of the coupling. Because the stresses during makeup of one end do not affect the other end of the coupling, the overall stress levels, pootential for thread damage and leakage are reduced in the joint. As a result, the outside diameter of the coupling may be significantly reduced so that the joint can be run more easily in a restricted diameter well bore.

Abstract: A screw coupling joint having a sealing portion between an outer circumference formed in convex in an axial direction of the coupling joint at the end of the male screw portion and an inner circumference formed in taper at an inner part of the female screw portion. The female screw portion has a stopper end positioned to be contacted, when the coupling joint is assembled, by the inner end of the male screw portion. The taper is between 1.degree. and 3.degree. and the inner diameter D.sub.1 of the female screw and the outer diameter D.sub.2 of the male screw have the relationship D.sub.2 >D.sub.1 at a tangent point therebetween. The end of the male screw portion and the end of the stopper are vertical or perpendicular to the axis of the coupling joint.

Abstract: A gauging device and method for use in coupling threaded tubular articles including tubes and couplings. The device and method provides for the use of gauges for the tube and coupling that provide markings thereon that when in register during coupling indicate when a preselected threading distance has been achieved. A coupling assembly is provided that employs an annular gasket attached to the coupling and adapted to be deformed by the end of a tube when inserted into the coupling to provide sealing.

Abstract: An end fitting for a serpentine heat exchanger couples an inlet or outlet port to a pair of flat tubes comprising the heat exchange core. The fitting comprises three laminated plates and a nipple coupled to an opening in the outermost of the plates. The inner plate is a header plate with slots for receiving the flat tubing. A spacer plate interconnects the outer and inner plates and has an aperture shaped to couple the port to the slots for defining a fluid flow path. The plates are stamped from aluminum sheet stock clad with a brazing alloy. The plates are assembled and secured by a steel rivet and the nipple is attached. The parts are joined by brazing. The fitting can be brazed to the exchanger core at the same time.

Abstract: Fittings for cylindrical members such as pipes, tubes, and rods. A nut main body has internal camming surfaces formed by threads on a bore or recess inner surface, and a cap bolt has a through bore, and a longitudinally segmented shank defining clamping legs. External camming surfaces defined by threads on the remote ends of the clamping legs from the bolt head fit within the internal camming surfaces with the bolt head engaging the nut main body so that the internal and external camming surfaces are contained within the nut main body and protected against damage. A cylindrical member fits through the cap bolt bore and into the nut main body recess axially beyond the internal camming surfaces. Further tightening of the cap bolt causes camming action of the camming surfaces to occur, forcing the clamping legs to bend in cantilever fashion so that their remote ends clampingly grip the cylindrical member. Suitable seals are provided to keep the camming surfaces protected.

Abstract: A joint for joining together lengths of fiberglass reinforced pipe or assembling joint components to a length of fiberglass reinforced pipe has abrasive threads capable of cutting matching threads into the surface of the pipes being joined. The abrasive threaded coupling requires no shaving or other surface preparation of the pipes to be joined for assembly of the joint. If a bonding adhesive is used in the joint, the joint is not sensitive to and will not be damaged by the movement of the joint before the adhesive has cured. The abrasive threaded joint can be modified for use as a pipe coupling, fitting, flange, adapter or a quick and effective repair coupling.

Abstract: A connector for connecting a tube such as a coil tubing, or the like, to well tools, pipe, or another tube. The connector will withstand high pressures and is capable of transmitting high tensile and torque loads, and can be applied to tubes by crimping through use of conventional swaging devices.

Abstract: An explosion-proof electrical conduit sealing fitting for threadedly engaging at least two threaded conduits and surrounding at least one conductor running through two threaded conduits includes a first element having a portion threadedly engaging at least one of at least two threaded conduits; a second element having a portion threadedly engaging at least one of the at least two threaded conduits, and connections for the first element and the second element. When properly connected and screwed into place, the sealing fitting of the present invention completely surrounds the at least one conductor and threadedly engages all of at least two threaded conduits.

Abstract: A pipe joint has a tubular retainer for inserting pipes to be coupled therein, a joint body fitted over the retainer and having a socket holder, and a tubular socket movably disposed around the socket holder. When connecting the pipes to each other, the pipes are inserted into the retainer and positioned therein, the joint body is fitted over the retainer, and the socket holder is brought over the socket holder until the socket is held against a positioning member on the socket holder. A spring in a positioning groove in the socket holder is resiliently displaced radially outwardly partly into a smaller-diameter recess in the socket while partly remaining in the positioning groove, whereupon the socket is retained on the joint body against removal.

Abstract: A pipe coupling for joining a first pipe to a second pipe, a pipe elbow, a fitting, a machine or the like. The coupling has at least two half shells which engage around the first pipe to form an axial gap and can be tightened against each other by a radially-acting tightening device. The half shells engage axially behind a coupling collar due to a radially inwardly projecting annular shoulder, and together with the collar enclose a sealing ring which is supported on the pipe wall by a radially acting sealing surface. A support ring is likewise enclosed by the half shells and is pushed loosely onto the first pipe. The half shells abut on the pipe wall of the first pipe with their inner wall which is provided with surface contourings, so that tightening of the tightening device leads to pressing of the surface contourings into the pipe wall. The sealing ring is pushed completely onto the first pipe and abuts against the planar end face of the coupling collar.

Abstract: A conduit system for the flow of a fluid medium therethrough wherein the system is made up of a plurality of elongated conduit segments connected by means of fittings, such as straight connectors, elbows, T's or the like. The conduit segments are composed of opaque material and the fittings are composed of transparent material.

Abstract: A pipe connector comprises an internally threaded female member and an externally threaded male member for threaded engagement in the female member. When the members are fully engaged together, an axially and radially directed surface at the free end of one of the members, e.g. the male member, is abutted against a corresponding surface on the other member, e.g. the female member. The surface comprises radially inwardly and outwardly curved surface portions which are relatively dimensioned to be a radial force fit such as to cause deflection of the end portion of the free end of the male member away from the female member as the members are brought into full engagement to bring the surfaces into full engagement.

Abstract: A coupling for the plain ends of two pipes has a tubular housing with two flange-like end portions which extend radially inwardly toward the ends of the respective pipes. The housing contains two sets of externally toothed blocking elements each of which has an oval outline and is compelled to roll in the axial direction of the pipes when at least one of the pipes is moved axially and away from the other pipe. Each set surrounds one of the pipes and the blocking elements are rotatable on the respective end portions of the housing or on annular carriers in the housing. The blocking elements of each set can rotate relative to each other and their teeth penetrate into the housing and/or into the respective pipes in response to movement of one of the pipes away from the other pipe.

Abstract: Precision makeup at high speed of the most used forms of pipe and casing for production wells is assured by a novel coupling system. A pipe collar is provided with an internal precision makeup ring whose length along the pipe axis assures precise positioning and engagement. When the nose of the pipe is engaged with metal-to-metal contact against a reference shoulder on the precision ring a side surface on the nose end of the pipe engages a center seal ring disposed in the side wall of the collar between the reference shoulder and the threaded portion. This seal constitutes an effective barrier against the leakage of high internal pressures into the thread engagement region. End seals are mounted in grooves in the end recess portions of the collar, outside the threaded engagement region, to provide seals against external pressure, which can also vent internal pressures that are in excess of a predetermined threshold.

Abstract: A connection for well tubular goods including a male member, a female member, each having a double set of steep tapered hook threads, two internal pressure seals including a compressible primary metal-to-metal seal and a supplementary seal made up of a resilient corrosion resistant material and additionally, a primary resilient corrosion resistant external pressure seal, and a reverse shoulder engagement between the end of the male member and a shoulder on the female member to hold the primary metal sealing surfaces in sealing engagement.

Abstract: A pipe coupler with sealing apparatus for use with lined or unlined pipes has a pipe connector member having a bore for receiving a floating seal means intermediate to threaded pipe holding portions. The bore includes a bottom portion between first and second recesses. The first recess is provided with a stop side for prepositioning the floating seal means. The floating seal means includes a steel ring having opposing end recesses; the inner diameter side and two ends are substantially encased with a resilient plastics material. The steel ring has a width greater than the width of the bore's bottom portion. When pipes are initially fitted to the pipe connector, the steel ring abuts the stop member with the resilient plastics extending over the stop. When finally torqued, the torque is equalized between the pipes, and the steel ring of the floating seal means is centered over the bore's body portion with ends extending partially over the bore's recesses.

Abstract: A pipe connection of a first and a second fibre reinforced plastic pipe by accommodating a free end portion of each pipe in a centering plastic pipe part, an adhesive layer being present between the inner side of the centering pipe part and the outer side of the free end portions. A reinforcing layer extends over the centering pipe part and over parts of the first and second pipe part adjoining the free ends of the centering pipe part, preferably the centering pipe part has a smaller wall thickness than the wall thickness of the first and second pipe parts.The free end portions have a smaller wall thickness than the wall thickness of the centering pipe part.The centering pipe part may be formed as a bend, or part of a saddle or branch saddle and consists of a reinforced thermosetting plastic material.The bend may be formed from a plurality of standard bend parts of relatively small length, e.g. 5.degree. or 10.degree.

Abstract: A coupler for interconnecting in fluid communication a pair of axially aligned flexible pipe ends, employs a tubular member for insertion between two sections of drainpipe to be coupled. A first thread is included on a first end portion of the tubular member for threaded engagement of a first one of the two sections of drainpipe, along with a second thread on a second end portion for threaded engagement of the second section. An integrally formed annular flanges in one form of the invention serves as a grip with which to manually screw the tubular member onto the drainpipe, while a cutback portion on the flange prevents misalignment of the coupled sections at the coupling when placed upon the ground. Tapered end pieces that screw onto each end to accommodate smaller drainpipe are provided in another form, with the threads of the tubular member matching the helically-corrugated plastic casing surface of conventional RV drainpipe.

Abstract: To provide an electrically conductive path between metal pipes, e.g. soil or drain pipes, connected at butting ends by means of an annular gasket of electrically insulating material which fits around and spans the butting ends and is secured in sealing engagement with the butting ends by clamp, a bridge element of electrically conductive material retained to the gasket extends between and engages with the pipes. The bridge element is conveniently an attachment to the gasket having portions disposed at internal and external circumferential surfaces of the gasket. Teeth or like formations on the bridge element dig into the surfaces of the pipes to enhance the engagement. Electrically conductive engagement may also be made with the clamp at a portion of the bridge element at the exterior of the gasket.

Abstract: The disclosure relates to a tube coupling having a hollow tubular body having collet form couplings at either end thereof to receive and lock tubes in the body at either end. The body has an internal annular wall and an inner lines which extends over the wall shoulder and along the body to either side of the annular wall shoulder towards the locations of the collets. The liner is formed from a material which is inert to the fluid to be passed through the tubes and has integral annular seals to seal with the tubes inserted in the body to prevent loss of fluid from the tubes into parts of the body not covered by the liner.

Abstract: The disclosure relates to tube couplings in which a hollow body (10) has an opening (11) to receive a tube (15) and a collet (32) having resilient arms encircling the tube in the body to grip the tube. An annular cam (22) is mounted in the body and has a tapered internal cam surface (31) engaged by the collet arms (33) which reduces towards the open end of the body to increase compression of the arms against the tube as the collet is drawn towards the open end of the body to lock the tube in the body. The cam member (27) is mounted in the body for axial adjustment with respect to the body, for example by a screw engagement (28) in the body, to enable the cam to be adjusted with respect to the collet to vary the compressive force applied to the resilient arms.

Abstract: An improved coupling (10) to be embedded in concrete (101) is described. The coupling includes multiple concentric rings (11c) on an outside wall (11a) of a tube (11) which aid in preventing leakage along the outside wall and which help in providing fire retardancy. The coupling includes a step form (14) having a regular diameter which aids in positioning the coupling using a template (105).

Abstract: A fluid passage connector for liquid chromatographs, which comprises a tube having a flat portion at one end, a bushing fixed to the outer periphery of said tube, a joint having therethrough a fluid passage, around the opening portion of which is provided a seal seat surface, and an engaging member for urging the bushing for said tube, which is inserted into said joint, thereby to fluid-tightly engage the flat end portion of said tube with said seal seat surface.

Abstract: A pipe coupling for coupling the ends of pipes which may or may not have spigots at the ends and in which there may be variations in the diameters of the pipe ends and/or the spigots. A circular gasket spans the ends of the pipes being coupled. A clamping device clamps around the gasket and against the pipe ends. The gasket has a smooth, uninterrupted, intermediate exterior portion. A space or cavity is provided between this portion of the gasket and the inside of the clamping device. One or more external ribs are provided on the outside of the gasket between the intermediate portion and each end. These ribs are enlarged or enhanced in height or depth to provide the cavity between the intermediate part of the gasket and the inside of the clamping device. A spigot on the end of one pipe or both will force the intermediate part of the gasket into the cavity which provides space to accommodate the presence of spigots and variations in diameter.

Abstract: A fitting for rigid conduit including an annular body receiving the conduit and including a seal assembly utilizing an elastomeric seal axially compressed and radially expanded to engage the conduit by a compression ring. A ring retainer maintains the seal assembly in a preliminary position during shipping and assembly of the coupling with the conduit, and the ring retainer includes a second position retaining the seal in a sealed expanded condition. The fitting also includes a conduit positioning abutment capable of accommodating conduit displacement during sealing.

Abstract: A corrosion-resistant pipe coupling made of carbon steel has on its inner surface an intermediate annular projection directed radially inward. At least an innermost part of the annular projection is formed of corrosion-resistant material such as stainless steel. The annular projection may be covered by a corrosion-resistant annular member which is secured by friction welding, electron beam welding, an adhesive or mechanical engagement. The annular member prevents corrosion of the coupling by corrosive fluids flowing in pipes.