Abstract: To provide a pipe joint which can be easily assembled and can maintain the connection of pipes firmly while simplifying the pipe connecting work. Tapered surfaces 6 which reduce in diameter toward openings 2 are formed on inner peripheral portions of half portions of a tube 1 in order to join pipes A and B together, and a diameter-reducible elastic wedge ring 7 is disposed on the large inside diameter portion of the tapered surface 6. In order that when the pipes A and B are about to slip out, the wedge rings 7 are pressed out along the tapered surfaces 6 to reduce a diameter thereof, rubber rings 10 capable of being placed in close contact with the pipes A and B are engaged with and held on sliding rings 8 capable of sliding smoothly along the inner periphery of the tube 1 and provided adjacent to the wedge rings 7. When the wedge rings 7 assume a diameter-reduced state, they are encroached on the outer peripheral surfaces of the pipes A and B to prevent the pipes from slipping out.

Abstract: A pipe coupling includes two sealing rings, each corresponding to one of the pipes. A sleeve is disposed within a retention device. The sleeve has axial end portions, each of which rests against one face of the sealing rings. The retention device has inwardly open grooves, one side wall of which rests against the respective axially inner sides of the axial end portions of the sleeve. The other side wall of the inwardly open grooves exerts an axial force on the other faces of the sealing rings as the clip is clamped, thereby pressing the sealing rings against the pipes.

Abstract: The invention relates to a pipe coupling having a sleeve-shaped outer body for accommodating a sealing arrangement and at least one pair of clamping elements, which is arranged adjacent to one side of the sealing arrangement inside the sleeve-shaped outer body and serves to clamp the end of an inserted pipe in place, in which case the pair of clamping elements can be restrained against the end of an inserted pipe transversely to the axis of the pipe coupling via a clamping screw passed through the sleeve-shaped outer body and is pressed apart by of a spring, and the clamping elements are guided in the restraining direction in the sleeve-shaped outer body.

Abstract: A coupling body has: (i) a central member; (ii) a first retaining member; and, (iii) a second retaining member. The first retaining member and the central member define a first pipe receiving region. The second retaining member and the central member define a second pipe receiving region having a tapered inner surface. A selectively constrictable clamp collar is located in the first pipe receiving region. A bolt or other actuation member is operably engaged with the clamp collar and is movable to constrict the clamp collar. A gripping collet is located in the second pipe receiving region and includes a tapered outer surface. At least one tie-bolt or other fastener extends between the retaining members and is selectively adjustable to draw the first and second retaining members toward each other so that the tapered inner surface engages the tapered outer surface of the collet to constrict the collet radially.

Abstract: Coupling device for a pipe, comprising a sleeve having an insert end for the pipe and a sealing means adapted for realizing a seal around the pipe when inserted in the sleeve, said sealing means comprising a plurality of mutually slidable elements which together form a ring, and a grip ring being mounted within said elements and extending along at least a part of the perimeter of the pipe, the grip ring being formed with dents pressed out of the plane of the grip ring.

Abstract: A connection device that makes it possible to make a tight connection between two ends of tubes (20), two symmetrical and opposite portions (2a, 2b) for engaging ends of respective tubes (20), with each of the portions (2a, 2b) having hooking means to keep the tube in the connection, and sealing means for such connection, with said hooking means on each portion (2a, 2b) having:

Abstract: A pipe joint, includes a press fitting with a section that is beaded in cross-section and holds a sealing ring and with a cylindrical area attached thereto that has, at the end of its extension, a flange-like depression forming a stop. The pipe joint also includes a pipe, whose smooth end, after being inserted into the press fitting, comes to rest on the inner stop of the press fitting. A non-detachable, tight pipe joint is formed by means of a pressing tool having at least two pressing jaws encompassing the press fitting after the pressing jaws are closed. During pressing, the pressing jaws act both on the annular bead, including the sealing ring placed therein, and on the cylindrical area of the press fitting.

Abstract: A pipe coupling axially connects two pipes having a smooth outer surface. The pipe coupling includes a first split circular ring and a second split circular ring. The first and the second split circular rings are made from a metal strip. Each of the strips have a radially inner edge surrounding the ends of the pipes. A plurality of teeth are disposed at the radially inner edge of the strips. The teeth are disposed in the plane of the respective rings. A free end of the tooth penetrates into the pipe when the coupling is in the clamped position. The teeth extend at an angle relative to a longitudinal axis of the pipes. A side of each of the teeth facing toward the pipe inserted in the coupling have, adjacent to the free end of the tooth, at least one indentation. The indentation displaces the material of the tooth on the side of the tooth in the direction toward the free end of the tooth.

Abstract: An end fitting/pipe coupling in which to receive a flexible pipe end to be joined includes an annular seal of chevron configuration supported in the fitting for surrounding the received pipe end and is comprised of an elastomer composition defining a plurality of uniformly spaced parallel separations each containing an annular metallic shim adapted to increasingly grip the pipe in response to a pull out force encountered by the pipe end.

Abstract: A pipe joint provided with a joint main body having a tapered female screw portion on an opening end, and a cylindrical retainer having a male screw portion screwed into the female screw portion and plural small-disc continuous bodies each of which is composed of two or three small discs for pipe fixation embedded in the male screw portion along with the thread as a part of the small disc protrudes from a peripheral side and another part of the small disc protrudes from an inner peripheral face.

Abstract: A pipe coupling for the joining of plain end plastic or metallic pipe that includes an annular follower, a tubular middle ring extending between opposite followers, an annular gasket within the follower contiguous to the middle ring and a restrainer unit within the follower comprising a lock ring having a plurality of arcuately spaced radial slots for slideably supporting individual gripper segments that are operative during tightening installation of the follower about a received pipe end to effect a penetrating restraining grip against the surface of the pipe end.

Abstract: A pipe joint which is made of a hollow body member having a passageway therethrough for receiving a pipe, a segmented gripper means positioned in a first circumferential tapered channel in the hollow body member and moveable axially within the passageway. The arrangement is such that, in use, when forces are applied tending to separate the pipe from the hollow body member the segmented gripper means can move axially along the tapered channel into gripping engagement with the pipe.

Abstract: A segmented coupling for use in coupling lengths of plain ended pipe employs cutter members of high strength steel to perform the required interconnection of the pipes, the cutter members being immovably held in the respective coupling segments and, upon tightening down of the coupling being operative to bite into the exterior surface of the associated pipes.

Abstract: A water purifier includes a quick connect connector in a port that receives a tube that carries the water. The tube is received along the axis of the port in a first reference direction along the axis. The connector is assembled by inserting, in sequence, a support ring, an O-ring, and a plug into the port along the axis, but in a direction opposite the first direction. The plug is held in place by adhesive or conventional welding. To complete the assembly, a collet is inserted into the port along the axis and in the first direction. A tube is then connected to the water purifier by urging the tube through the collet, along the axis, and in the first direction. The tube is gripped by the collet, supported by the support ring, sealed by the O-ring, and stopped against the plug.

Abstract: The low pressure seal arrangement for sealing a space defined by an inner diameter of a pipe and a rod slidably disposed with the pipe. The low pressure seal includes a sealing insert of reusable, noncorrosive, shape retentive, resilient, boron-resistant, flexible polymeric resin with an axial passage for receiving the tubular rod. The sealing insert combines the functions of a gasket and a stopper, the sealing insert having a hub end of a larger diameter than the pipe, preventing the sealing insert from slipping into the pipe. The sealing insert is installed by hand without tools and resists a pressure of at least 350 psi. The sealing insert may be removed and reused, reducing the amount of radioactive waste generated by the nuclear reactor.

Abstract: A water purifier includes a port having a collet, an O-ring seal, and a support between the collet and the seal. The collet axially receives a tube for water passage. The support limits radial movement of the tube off the axis. The support has an L-shaped cross section having a radial leg that seats the O-ring, and an axial leg. Water purifiers are often installed in confined spaces near mechanical equipment. Conventional water purifiers installed with sharp bends in influent and effluent water tubes and exposed to equipment vibration conducted by the tubes often exhibit weeping at the port. In an embodiment of the present invention, weeping is eliminated by maintaining axial relation between the tube, the seal, and the collet.

Abstract: A thermowell assembly and method which allows for arresting leakage in the case a thermowell begins to leak in a hydroprocessing process without having to shut down a flow of a hydrocarbon feed stream through a hydroconversion reaction zone in the hydroprocessing process. The thermowell assembly comprises a first hollow sleeve section which supports a thermowell member, a ferrule sealing member which engages the first hollow sleeve section, a second generally cup-shaped second sleeve section wherethrough a thermocouple member slidably passes, and an outer sleeve member for maintaining the union of the first sleeve section, the ferrule sealing member, and the second sleeve section. The method comprises severing and/or removing the thermocouple member from the commenced-leaking thermowell member and placing a high pressure cap over an aperture left vacant by the thermocouple member to seal-off the leaking thermowell member from the atmosphere.

Abstract: A coupling assembly for a first tubular member, comprising: a receiving member defining an opening adapted to receive the first tubular member, and having an inner portion defining an inner bore dimensioned to receive an end portion of the first tubular member, and an outer portion defining a first internal annular cavity communicating with the inner bore and having a diameter greater than the diameter of the inner bore; an annular locking member having an outer rim portion fitted within the first internal annular cavity, and having an inner portion of generally frustoconical shape angled inboard from its outer rim portion such that its inner rim extends in its relaxed position into the inner bore so that the inner rim contacts and penetrates the outer surface of the first tubular member when the first tubular member is inserted into the inner bore, to inhibit separation of the first tubular member from the receiving member; a stop member abutting the outboard side of the outer rim portion of the locking memb

Abstract: A locking insert 4 for joining the male and female ends of spheroidal-graphite cast-iron pipes conveying fluids under pressure has a generally planar shape, and includes at least two metal parts 4A, 4B fixed to each other by an electrically insulating junction layer 4C.

Abstract: A socket joint for pressurized fluid carrying pipes incorporates a radially-compressed gasket 4 locked in position by toothed inserts 12 each having an inclined face 27 which slides on and bears against a similarly inclined face 26 of a support insert 11 embedded in the anchoring heel 14 of the gasket which is seated in the anchoring throat 7 of the socket.

Abstract: A locking device for a system of laid pipes comprises a gasket 2 and one or more assembled components which form a hollow cylinder 4 surrounding and accommodating the gasket, the hollow cylinder incorporating an anchoring groove 8. The gasket is elastic and has a solid body portion 9, an integral annular heel member 10, and a plurality of embedded anchoring inserts.

Abstract: An improved pipe connection comprises a connection slot, a sleeve and a clip assembly. When a pipe is inserted therein, the clip assembly is used to thrust the pipe into the slot while anti-skiing plates and stretching clips automatically grasp the pipe such that a complete connection can be completed within a very short moment.

Abstract: A wall at one end of a chamber in the bell end of an enclosing pipe is adapted to receive the nose end of toothed metal segments to prevent disengagement of pipes and to transfer radial forces into axial forces.

Abstract: A sealing ring for sealing off a joint between a fluid power line and a fluid power component to be connected therewith. At one axial side the sealing ring has two overpressure sealing lips arranged in a v configuration. At the opposite axial side a thrust portion is provided for cooperation with a gripping element. The thrust portion and an inner underpressure sealing portion provided thereon define a radially moving pivot ring. If the fluid power line is under vacuum, the pressure of the surroundings causes the pivot ring to be shifted inwards and the underpressure sealing portion is thrust sealingly against other surface of the fluid power line.

Abstract: A quick pipe coupling a circular receiving chamber adjacent to the orifice thereof for holding a movable taper ring and an inflatable tube, an U-shaped lock pin releasably inserted therein to retain the taper ring in place, a toothed lock ring fastened in the orifice, wherein the movable taper ring is squeezed by said inflatable tube against the teeth on the toothed lock ring when the U-shaped lock pin is removed from the pipe coupling, causing the teeth on the toothed lock ring to respectively engage into the outer surface of the pipe inserted through the lock ring, the movable taper ring and the inflatable tube into the pipe coupling so that the pipe inserted therein is firmly retained in place.

Abstract: A hose fitting for sealed connection to a hose, comprising: a first cylindrical member having a small diameter bore portion and a large diameter bore portion connected to the small diameter bore portion; a second cylindrical member axially slidable within the large diameter bore portion and having a radial flange portion and an axial tubular portion extending from the radial flange portion, the radial flange portion being provided with a sealing member and the axial tubular portion being provided with a sealing member; a sleeve provided within the large diameter bore portion and having an inclined surface; a collet provided within the large diameter bore portion and having an outer surface engageable with the inclined surface of the sleeve and radially constrictible when moving axially within the sleeve, the hose being firmly fixed between the collet and the axial tubular portion of the second cylindrical member by axial outward movement of the collet; and a stop member received in the large diameter bore por

Abstract: A hose fitting comprising a first cylindrical member having a small diameter bore portion and a large diameter bore portion connected to the small diameter bore portion, a second cylindrical member axially slidable within the large diameter bore portion and having a radial flange portion and an axial tubular portion extending from the radial flange portion, a sleeve provided within the large diameter bore portion and having an inclined surface, a collet provided between the second cylindrical member and the sleeve and having an outer surface engageable with the inclined surface of the sleeve, the collet being further formed at its inner circumferential portion with an inner circumferential edge, the inner circumferential edge being adapted to bite on the hose when no internal fluid pressure is applied within the small diameter bore portion and when the hose is pulled out axially outwardly, the hose being firmly fixed between the collet and the second cylindrical member by axial outward movement of the collet

Abstract: A hose fitting for sealed connection to a hose, comprising: a first cylindrical member having a small diameter bore portion and a large diameter bore portion connected to the small diameter bore portion the large diameter bore portion having at its axially outer end an axially outwardly narrowing portion; a second cylindrical member axially slidable within the large diameter bore portion and having a radial flange portion and an axial tubular portion extending from the radial flange portion, the radial flange portion being provided with a sealing member and the axial tubular portion being provided with a sealing member; and a collet provided within the large diameter bore portion and having an outer surface engageable with the axially outwardly narrowing portion of the first cylindrical member and radially constrictible when moving axially within the sleeve, the hose being firmly fixed between the collet and the axial tubular portion of the second cylindrical member by axial outward movement of the collet.

Abstract: A connector for smooth pipes characterized by having one of the ends of the sleeve (3) equipped with a peripheral housing (4) receiving locking rings for fixing the connector securely on one end (1) only of one of the pipes to be connected, the end of the other pipe (2) being able to slide freely in the sleeve (3) while being in contact only with the corresponding lip (15) of the joint (13).

Abstract: The invention relates to a method and apparatus suitable for example in enabling the installation of a casing hanger within a bore in an oil-drilling wellhead in a manner so that the installation and the sealing-in of the casing hanger is accomplished in a single operation. The invention thus comprises installing a component (2) within a bore (4) so as to be received therewithin in a fluid-type manner utilizing expandible seals (8) and a shoulder (36) within the bore (4) adapted to be contacted by a leading edge (32) of one of two concentrically arranged sleeve members (12, 14) which are driven downwardly within the bore towards the shoulder, the two sleeve members which encircle the component (2) being secured together by shearable links (25).

Abstract: A hose fitting for connecting a hydraulic hose to a hydraulic system including an axially inner reduced diameter bore portion and an axially outer enlarged diameter bore portion formed with an inner circumferential groove, comprising: a cylindrical member axially slidable within the enlarged diameter bore portion and having a radial flange portion and an axial tubular portion extending axially outwardly from the radial flange portion; a sleeve mounted on the enlarged diameter bore portion and having an inner inclined surface; a collect arranged between the cylindrical member and the sleeve and having an outer surface engageable with the inner inclined surface of the sleeve and radially inwardly constrictible when moving axially outwardly within the sleeve, the hydraulic hose being crimped by axial outward movement of the collet; and a stop member received in the circumferential groove and adapted to limit axial outward movement of the sleeve and collet.

Abstract: A support assembly (1,11,31) for mounting within a vessel (3) which may be subjected to an inwardly acting pressure differential, comprises a support member (2,12) which is in contact with an internal surface, of the vessel so as to define a recess (4,14). In use the recess is filled with an incompressible fluid, which may be an hydraulic oil. The support member (2,12) may be further provided with an intensifier (19,32) which produces a positive pressure differential between the fluid in the recess (4,14) and the pressure acting on the vessel 3. The effect of this is to induce a tensile loading in the vessel wall in the vicinity of the recess (4,14) and thereby provide support for the vessel.

Abstract: A coupling for use with an insert. The coupling including a latching sleeve unbalanced under pressure and a release sleeve for venting pressure.

Abstract: A rigid coupling for plain ended pipe includes radially inwardly movable wedging members of a hard but ductile material, which optionally may be in the form of a collet, and a member providing a camming surface corresponding with an external camming surface on each of the wedging members, the wedging members each having an axially straight inner surface for cooperation with the external axial surface of a pipe, the inner surface of the wedging members being coated with a grit material of a hardness greater than that of the pipe and that of the wedging members, for it to become matrixed within the respective surfaces on the application of compressive forces to the wedging members.

Abstract: The non-profiled end portions of two pipes can be coupled to each other by a ring-shaped band which has at least one axially parallel gap and circumferentially extending corrugations defining two outer chambers and at least one median chamber. Each chamber is open toward the peripheries of the pipes and each outer chamber surrounds a different pipe. Such outer chambers contain arcuate safety devices with radially innermost portions in the form of claws serving to penetrate into the material of the respective pipes when the band is tightened around the end portions of the pipes by a clamping unit which is designed to reduce the width of the gap. The median chamber of the band confines a deformable annular insert which has marginal sealing lips and serves to establish a seal between the internal surface of the band and the peripheral surfaces of end portions of the pipes when the clamping unit is actuated to reduce the diameter of the band.

Abstract: A pipe end fitting or coupling including an elongated tubular body having a bore at its first end and a counterbore at its second end with the counterbore being formed as a plurality of frusto-conical grooves and with each of the grooves converging toward its second end. A support sleeve is mounted within the bore and extends throughout the counterbore to form an annular chamber. A cylindrical pipe may be fitted into the annular chamber to form respective chambers with each of the grooves. The respective chambers are filled with a hardenable epoxy resin to complete the end fitting connection.

Abstract: A pipe coupling wherein a composite housing surrounds the objects or parts to be coupled with one another. The housing confines two annular gripping members, one for each part and each having a trapeziform cross-sectional outline with two oppositely inclined legs flanking an annular web which can be biased toward the respective part by a set of screws mating with the housing. The radially innermost portions of the legs have teeth which penetrate into the material of the respective parts to hold the parts against axial movement relative to each other. Each gripping member can be received in a discrete groove which has a trapeziform cross-sectional outline and is bounded in part by two oppositely inclined flanks whose inclination with reference to the axis of the housing is more pronounced than the inclination of the legs on the gripping members. The teeth of the legs of the gripping members are immediately adjacent the respective flanks.

Abstract: A spigot-and-socket joint which is secured against pulling apart, particularly for socket pipes manufactured by centrifugal casting or molding, wherein the spigot end of one pipe is pushed into the socket end of another pipe, with radial play, comprises a sealing ring and a gripping ring in the socket pipe, the gripping ring comprising a plurality of gripping segments mutually spaced circumferentially and each having a spherically convex radially outer surface and being interconnected in the circumferential direction by a vulcanized intermediate piece of rubber or the like, and a toothed configuration on the radially inner surface, so that when axial tensile forces arise at the joint, the toothed configurations are pressed radially inwardly against the spigot end by interaction of the spherically convex surfaces with an interior conical surface of the pipe socket which interior surface narrows in the direction of the distal end of the socket.

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: Apparatus for connecting together flowlines including separately actuated gripping and sealing assemblies which are actuated by hydraulic pressure but are held in actuated positions utilizing internally mounted mechanical-type mechanisms.

Abstract: This invention relates to a quick connect type of tube connector which engages the outside diameter of the tube with a self-locking capability and which increases its gripping action on the tube by fluid pressure developed behind a piston in a chamber housing the piston and having seals between the piston and chamber and between the tube and an axially slidable member applying initial gripping action on the tube.

Abstract: A fitting (30) for use with soft tubing (40) is disclosed. The fitting includes a threaded female member (36) defining an aperture for insertion therethrough of the tubing. The fitting further includes a male member (32) defining a generally tubular portion (46) adapted for insertion into the end of the tubing. The male member includes a radially extending flange for preventing the insertion of tubular portion into the tubing beyond a predetermined distance. The male member is further threaded for threading onto the female member. A sliding mandrel (48) is positioned on the tubular portion for axial movement thereof. The female member includes a generally inwardly projecting collar portion (64) for engaging the outer surface of the tubing, the collar portion cooperating with the sliding mandrel to maintain the tubing in the fitting when a tensile pull is exerted on the tubing.

Abstract: A coupler adaptor is provided for use in operative association with a container and a valve. The container houses relatively high pressurized carbon dioxide gas for use in carbonating a beverage. The valve is actuated in order to release the gas to an interface passage formed in the coupler adaptor. The coupler adaptor also has a pair of grooves formed on opposite sides of the interface passage for receiving O-rings. The coupler adaptor is also in operative association with a pressure regulator. The pressurized gas enters the pressure regulator from the coupler adaptor interface passage. In one embodiment, the coupler adaptor remains operatively joined to the pressure regulator without retaining structure due to the balanced gas pressure which results because of the O-rings positioned adjacent the coupler adaptor interface passage.

Abstract: An improved construction for resisting pipe pullout in a pipe coupling of a type subject to being inwardly swaged in the course of forming a coupled joint. A circumferentially extending lock ring having a plurality of axially spaced chisel shaped teeth on its inward face is inwardly dished about its periphery. The ring is axially located within the coupling shell by an annular inwardly extending protuberance on the inner face of shell interfitting within the dished section of the ring periphery. In response to an imposed swaging force, the coupling shell is constricted inwardly to compress a gasket into sealing engagement with a contained pipe section, while the lock ring is concomitantly constricted inwardly into a gripping interlock therewith.

Abstract: There is provided a quick-action push-in connector for fluid-carrying tubing. The connector comprises an outer member having fluid passage means and an inner member at least partly accommodatable in the outer member. The inner member has a substantially central passage adapted to admit the tubing and to allow the same to communicate with the fluid passage means and is provided with at least one inwardly directed gripping protrusion adapted to engage the tubing. At least at the protrusion, the inside diameter of the inner member is elastically reducible by interaction of the inner member with at least a portion of the outer member, and elastically expandable by application of a spreading force, and is in the free, unreduced state, smaller than the outside diameter of the tubing and adapted to undergo an initial expansion when the tubing is pushed in.

Abstract: A fitting for mounting to the ends of smooth wall tubes, the fitting having an entry for the tube and a collet which grips on the outside diameter of the tube by means of a mechanical spring. The fitting also seals on the inside diameter of the tube. A passageway extends through the fitting such that the tube is in fluid communication with a supply source, the fluid being able to flow between the supply source and the tube. The fluid pressure activates a piston in the fitting which causes the collet to engage the tube more securely and also increases the seal within the inside diameter of the tube.

Abstract: In a pipe coupling for connecting pipes as fluid conduits, a split clamping ring, which is of arcuated configuration in cross section, has a pair of spaced circular sharp edges directed toward the pipe for firm engagement therewith and is disposed in an annular groove formed internally of a body so as to be slightly displaceable relatively to the groove in an axial direction of the body when a certain axial force is applied to the pipe; a deformable sealing ring is disposed in another annular groove formed internally of the body; and a plurality of depressing members are provided for adjustably compressing the clamping ring diametrically.

Abstract: The present invention relates to instant fittings for smooth, bare tubes, comprising a hollow body having a bore corresponding to the section of passage of the fluid and an inner housing in which is disposed the tube retaining means, said tube being held by an obturation and abutment means, mounted on the body at one of the ends of the housing on the side of the entry of the tube in the fitting. The housing which presents at least two successive bores encloses a locking element and a tube retaining member generally tubular in form, which are mounted to slide axially in said housing, said retaining member and said locking element comprising click means ensuring a tightening stress of the retaining member on the tube. The invention is used for the connection of tubes.

Abstract: A pipe joint for preventing separation comprising a holding member connectable to an annular outer flange formed at the end of a socket and surrounding the outer periphery of a spigot outside the socket, the holding member being annular or being adapted to form an annular shape, the holding member being provided on its inner periphery with a tapered surface increasing in diameter toward the socket; a stopper in the form of a ring divided at one portion and provided with an outer peripheral tapered surface increasing in diameter toward the socket and with engaging edges in circumferential rows on its inner periphery, the stopper being interposed between the tapered surface of the holding member and the spigot outer periphery; and tap bolts extending through the holding member at suitable portions along its circumference for pressing the stopper from outside against the spigot outer periphery. Because the stopper is thus shaped, the joint is easy to assemble and manufacture.

Abstract: A preassembled tube coupling into which a tube may be inserted and which automatically grips the tube to prevent withdrawal of the tube. The coupling includes a packing ring for sealing the tube, a sleeve with spring fingers to lightly grip the tube upon insertion of the latter, and a nut with a cam surface to contact the fingers into tight gripping engagement with the tube upon slight withdrawal motion of the tube.