Abstract: A corrugated tube includes a tubular body, formed with a slit extending in an axial direction of the tubular body; a plurality of ridge portions, formed on an outer periphery of the tubular body and arranged side by side in the axial direction; and a lap portion, protruded from one of opposed end portions of the tubular body which are separated by the slit and extended toward an inner face of the other opposed end portion of the tubular body. A plurality of fixation members are provided on the outer periphery of the tubular body to fix the corrugated tube onto the panel body in a state that the tubular body is so twisted that the slit is spirally extended.

Abstract: Rigid corrugated plastic pipe sections are provided with a flange radially extending from at least one end of the pipe length, which allows structural and water tight joints between connecting flanged pipes and fittings to be formed in an assembly including a peripheral clamp and gasket, and a system, method and kit for effecting structural and water tight joints in corrugated plastic pipe pipes.

Abstract: A coupling system, comprising: a first bellows element; a fluid handling component; and a coupling assembly releasably connecting the first bellows element to the fluid handling component for maintaining a secure connection between the first bellows element and the fluid handling component. The coupling assembly comprises a first flange attached to the first bellows element and a second flange attached to the fluid handling component, the first and second flanges alignable with each other to form a locking space; a locking member sized to fill the locking space; and a sealing structure positioned between the first bellows element and the fluid handling component to form a seal proximate the effective diameter of the first bellows element. A kit and a method for connecting a bellows element to a fluid handling component are also disclosed.

Abstract: A pipe coupling for joining two sections of pipe provides six degrees of freedom where the pipe coupling includes an inlet portion, an outlet portion disposed opposite the inlet portion, and an intermediate portion disposed between the inlet and outlet portions for providing relative movement between the inlet portion and the outlet portion. The intermediate portion has a plurality of corrugations disposed about a circumference of the pipe coupling and each corrugation includes first and second arms diverging from a common vertex toward the inlet portion and outlet portion, respectively. The arms diverge at substantially a forty-five degree angle forming a V-shape, and each arm terminates at a transition area where each arm of the corrugation blends with the inlet portion and outlet portion, respectively.

Abstract: Fitting connections for corrugated metal tubing. The connection includes a body having an externally-threaded end, a nut or other fastener which is threadably engageable with the body end, and a collet which is receivable coaxially within the fastener. The collet is formed as a series of individual, arcuate tangs which are joined together by a retaining collar, the collar allowing the segments to be resiliently opened within the fastener so as to allow the crests of the tubing to pass therethrough. The fitting may be pre-assembled with the collet segments being received coaxially within the fastener with the collar extending rearwardly from the fastener, and with the fastener then being partially threaded onto the fitting body.

Abstract: Couplers for coupling conduit in end-to-end flow communication relationship are disclosed. A coupler has at least two coupling members each having one end hingingly attachable to one end of another of the at least two coupling members, and one of each coupling members having one end configured with a first cooperating attaching component and the other of each having one end configured with a second cooperating attaching component. There may also be a pressure producing element which increases coupling forces when said first and second cooperating attaching components are attached. There may also be corrugations in the walls of one or all of the coupling members that fit within corrugations of corrugated conduit being connected. The inside diameter of the coupler is about equal to or greater than the outside diameter of the conduit being thereby coupled. In addition, a plurality of couplers and/or coupling members may be used to couple conduit with small diameters and conduit with large diameters.

Abstract: A fitting for an end of a length of corrugated tubing has a split retainer that grips the tubing corrugations, and is engaged between a fitting body and a nut. Upon tightening the nut on the fitting body, the endmost corrugation is compressed between the retainer and a sealing seat on the fitting body arranged to provide a narrow metal-metal sealing junction and also a gasket seal. The fitting body has an inwardly tapered conical surface with a circular outer radius surrounded by an annular groove, thus forming a sealing edge, and the annular groove carries a gasket. The conical surface is dimensioned so that the sealing edge falls between the maximum and minimum diameters of the endmost corrugation. As the fitting is tightened, the endmost corrugation is collapsed between the sealing edge and the retainer, providing a metal/metal clamped sealing junction. The outer diameter part of the endmost corrugation is wrapped into a bead or torus that compresses the gasket, forming a metal/gasket additional seal.

Abstract: In a hose with corrugated metal tube, a connecting pipe is formed with a tapered inner surface in a tip end portion thereof a corrugated metal tube is formed with a flared portion flaring as to correspond to the tapered inner surface of the connecting pipe, and a mating pipe is formed with a tapered outer surface. The hose with corrugated metal tube is connected to the mating pipe by a cap nut so that the tapered inner space of the connecting pipe abuts the tapered outer surface of the mating pipe with the flared portion therebetween.

Abstract: A corrugated plastic pipe with an integral fastening section, whereby the corrugated plastic pipe can be fastened to any object by way of the fastening section.

Abstract: A tube connecting structure is formed with first and second cylindrical sections. The first cylindrical section includes: a joining cylinder with engagement holes disposed at a first end; a ring-shaped flange projecting radially inward from a second end; an inner cylinder extending co-axially toward the first end; and an inner cylindrical member separated axially from the inner cylinder. An O-ring is disposed co-axially between the inner cylinder and inner cylindrical member. Large and small diameter sections of the joining member align with a large-diameter section and small-diameter cylindrical section of the first tube, respectively, and are fitted into the space between the joining cylinder and the inner cylinder and inner cylindrical member. A second tube supported within the second cylindrical section is prevented from slipping out. The O-ring provides a fluid-tight seal between the first and second tubes.

Abstract: A pipe assembly comprises a first pipe section and a second pipe section of which at least one pipe section is provided with a spigot which is provided with outwardly annularly extending projections with flanks. A seal is arranged between two adjacent projections against their flanks. At least those projections between which the seal is arranged are formed as projections of increased wall thickness forming a portion of increased wall thickness and comprising a higher filling ratio than more distantly arranged projections.

Abstract: A fluid line connector includes a length of tubing having a plurality of corrugations formed therealong between opposing tubing ends. A non-corrugated section is disposed along the length of tubing between said opposing tubing ends such that a portion of said plurality of corrugations extends between the non-corrugated section and each of the opposing tubing ends.

Abstract: The connecting element for transporting gaseous, liquid or solid substances consists of a tubular coupling (3) which has on the inside a cylindrically running first recess (3c), in which a corrugated tube (1) is arranged, and which has a cylindrically running second recess (3b) which adjoins the first recess (3c) and in which an annular seal (4) is arranged adjacent to the first recess (3c) and an expanding ring (2) is arranged adjacent to the annular seal (4). The expanding ring (2) has, on the outside, a first projection (2b) which points toward the coupling (3) and engages in an encircling groove (3a) arranged in the second recess (3b). With its projection (2a) which points toward the corrugated tube (1), both the expanding ring (2) and the annular seal (4) are in each case in engagement with the corrugated tube (1) from outside. The subject matter of the invention is also the use of the connecting element as a subassembly in windshield washer units.

Abstract: The present invention relates to a metallic tubular hose which suppresses disintegration in which the metallic tubular hose comprises a hose body having a longitudinal edge at one end thereof and a bellows metallic tube inner layer with the inner layer composed of a corrugated bellows portion and a restricted portion, a jacket composed of a plurality of layers surrounding the inner layer, a rigid insert pipe extending into the hose body and a metallic sleeve engaging the hose body along said longitudinal edge for compressing said jacket against said rigid insert pipe wherein said plurality of layers in said jacket includes an inner layer adjacent to said restricted portion of said bellows metallic tube inner layer composed of a flexible and hard material possessing a tensile modulus of between 4 MPa and 8 MPa for a composition of rubber and about 300 MPa for a resin material composition and preferably between 1000 MPa and 6000 MPa.

Abstract: Connector tubing is provided by a pair of nested corrugated spiral flex tubes twistable relative to each other about an axis at a flex tube joint to provide torsion relief.

Abstract: A pipe coupling for joining two sections of pipe provides six degrees of freedom where the pipe coupling includes an inlet portion, an outlet portion disposed opposite the inlet portion, and an intermediate portion disposed between the inlet and outlet portions for providing relative movement between the inlet portion and the outlet portion. The intermediate portion has a plurality of corrugations disposed about a circumference of the pipe coupling and each corrugation includes first and second arms diverging from a common vertex toward the inlet portion and outlet portion, respectively. The arms diverge at substantially a forty-five degree angle forming a V-shape, and each arm terminates at a transition area where each arm of the corrugation blends with the inlet portion and outlet portion, respectively.

Abstract: An embodiment of the invention is a piping system including a fluid impermeable sleeve having a plurality of longitudinal, spaced ribs formed on an interior surface of the sleeve. A fluid carrying tubing is positioned internal to the sleeve. A coupling has a first end and a second end, the first end having interior threads engaging an outer surface of the sleeve. The coupling has a vent opening in fluid communication with the interior of the sleeve.

Abstract: A fluid line connector assembly includes a length of flexible tubing having a tubing end and a first fitting body received on the tubing end. A second is secured to the first fitting body, and at least one of the first fitting body and the second fitting body forms a fluid-tight connection with the tubing end. A third fitting body is rotatably supported on the second end fitting. A sealing member forms a fluid-tight seal between the second fitting body and the third fitting body. A method of assembling a fluid line connector assembly is also described.

Abstract: Corrugated plastic pipe sections having a flanged end formed by a circumferential portion of an end corrugation or section of the pipe liner and a method and kit for joining flanged end corrugated plastic pipe sections are described in a system in which a portion of the end currugation or pipe liner forms a flange and a peripheral flange clamp straddles flanges and draws the flanges together to provide a structurally sound joint. A gasket may be interposed between flanges or the flange periphery and the clamp. The invention achieves a cost effective tight joint, allows field cuts of the corrugated plastic pipe and the fabrication of fittings from corrugated pipe sections and provides a selectable pipe size reducer coupling for corrugated plastic pipe.

Abstract: Plug connection between a corrugated hose and an unprofiled pipe. A plug connection is provided between a corrugated hose (1) and an unprofiled pipe (31), a holding element (3, 34, 50) that surrounds the unprofiled pipe (31) being connected at least indirectly with the hose end (4), and the end (31) of the unprofiled pipe being surrounded by a sealing ring (16, 17, 30) that is situated before the holding element (3, 34, 50). The sealing ring is connected at least indirectly with the hose (1) so as to form a seal. It is provided that the holding element (3, 34, 50) is situated in the hose end (4) and is held thereby, at least indirectly, by mutual positively locking engagement in the axial direction, and that on the other side of the seal (17, 18, 30) a guide sleeve (18, 25) having an inner diameter that corresponds to the outer diameter of the unprofiled pipe (31) is situated before the holding element (3, 34, 50).

Abstract: Fitting connections for corrugated metal tubing. The connection includes a body having an externally-threaded end, a nut or other fastener which is threadably engageable with the body end, and a collet which is receivable coaxially within the fastener. The collet is formed as a series of individual, arcuate tangs which are joined together by a retaining collar, the collar allowing the segments to be resiliently opened within the fastener so as to allow the crests of the tubing to pass therethrough. The fitting may be pre-assembled with the collet segments being received coaxially within the fastener with the collar extending rearwardly from the fastener, and with the fastener then being partially threaded onto the fitting body.

Abstract: In a method of exhausting an interior room to atmosphere through a corrugated conduit, the use of a connector which is attached to the corrugated conduit by tongues seated in the recesses of the conduit corrugations as a result of a telescoping together of the connector and conduit, the tongues preventing opposite direction untelescoping and obviating leakage-promoting crushing of the corrugations as might result from using a clamp.

Abstract: A method of and an apparatus for rejuvenating a wastewater treatment system of the type including a septic tank, an aerobic treatment unit or the like connected by a pipe to a plugged downstream soil absorption system includes a wastewater treatment unit which is interposed between the septic unit/aerobic treatment unit and the downstream soil absorption system. The wastewater treatment unit includes a single piece or a multiple piece solids settling and retention basin within which is suspendingly supported a wastewater treatment mechanism essentially of the type disclosed in U.S. Pat. No. 5,264,120. The wastewater treatment mechanism includes filters for filtering and settling solids from wastewater and flow equalization ports for effecting flow equalization thereby eliminating flow surges to the downstream plugged soil absorption system.

Abstract: The present invention is a pre-assembled fitting or coupling having a body, a sleeve, and a nut. One end of the nut has a through bore that is tapered and decreases in diameter toward the end of the nut. The outer surface of the sleeve is tapered as well which facilitates the radial movement of the sleeve segments upon tightening locking the sleeve segments into the proper position on the corrugated tubing. The body contains an inner seal surface with improved geometry that effectively concentrates the sealing load over a pre-determined surface and prevents overloading of the seal surface area. The sleeve of the present invention is divided into four separate segments. The inner surface of the sleeve contains an annular spring. The spring on the inner surface facilitates the removal of the corrugated tube from the nut and coupling body by forcing the segments outward upon loosening the nut.

Abstract: A tube joint comprises a joint body which is provided with an attachment/detachment mechanism for attaching/detaching a fluid tube and which is formed of a resin material, and a bellows section which has annular projections and annular recesses alternately formed to be continuous in an axial direction and which disperses external force (impact force) applied to an outer surface of the joint body to avoid any concentration of stress.

Abstract: A coupler member for use with precast concrete segmental structures having a first duct, a first coupler member extending over and around an exterior surface of the first duct and having a seat opening adjacent an end of the first duct, a second duct, a second coupler member extending over and around an exterior surface of the second duct and a seat opening adjacent to an end of the second duct, and gasket received in the seats of the first and second coupler members. An external seal is affixed to an opposite end of the first coupler member and affixed to an exterior surface of the first duct. The seats of the first and second coupler members have slots facing one another. The gasket is received within these slots. The gasket has a tapered outer surface suitable for liquid-tight abutment against an inner surface of one of the slots.

Abstract: The present invention relates to a corrugated pipe connecting arrangement comprising a corrugated pipe with corrugations extended transverse to its longitudinal axis, which can be arranged at substantially identical distances from each other, wherein said corrugated pipe is formed with a one-piece plain region at at least one end, said plain region comprising an abutment section, and can engage with a connecting element which may be merged with said plain region and said abutment section.

Abstract: In a duct connection assemble, whereby upon connecting a saddle flange 2a of the joint duct 8 to the main ribbed duct 3 through the communication hole 1b, the rubber sealant 1 is interposed between the saddle flange 2a and a circumferential area of the communication hole 1b so that protuberances 2b uniformly press the rubber sealant 1 through the recesses 1d to tightly engage the saddle flange 2a against an outer surface of the main ribbed duct 3 through rib-fitting grooves 1a and the water sealing small projective rings 1c. The joint duct 2 is brought into an elastical engagement with the main ribbed duct 3 to achieve a good water sealing action for an extended period of time.

Abstract: A pipe joint between cylindrical male and female couplers having terminal end portions with cooperating cam surfaces that facilitate assembly of the couplers. Cooperating projections on the couplers cam past one another when the couplers are assembled and restrain the couplers against separation. A gasket is interposed between the couplers, and the couplers are articulatable at least several degrees to permit some curvature to a string of pipe. The couplers have splines received in annular sockets in the ends of pipes, and the sockets are filled with adhesive to retain the splines therein. The gasket is prelubricated and protected by a plastic wrap that also provides protection against ultraviolet rays. Cylindrical ring couplers are formed by extruding a strip having a coupler cross-sectional profile, cutting a length of the strip and fusing the ends at a joint.

Abstract: Rigid corrugated plastic pipe sections are provided with a flange radially extending from at least one end of the pipe length, which allows structural and water tight joints between connecting flanged pipes and fittings to be formed in an assembly including a peripheral clamp and gasket, and a system, method and kit for effecting structural and water tight joints in corrugated plastic pipe pipes.

Abstract: A fluid line connector assembly for connecting between two fluid transmission lines or between a transmission line and an appliance or other apparatus, such as a commercial fryer. The assembly includes a length of thin-walled, flexible tubing having helical corrugations extending therealong and opposing non-corrugated and generally cylindrical ends. A braided sheath extends along the exterior of the tubing and is secured at the tubing ends. A base ring is received on a tubing end and includes a first groove. An end fitting, including an interior passage having a second groove, is retained on and cooperable with the tubing end due to a retaining ring captured within a portion of each groove, allowing the end fitting to remain rotatable relative to the tubing. One or more o-rings are compressively positioned between the end fitting and the tubing end to form a fluid-tight seal therebetween.

Abstract: A hose swivel connection apparatus for connecting a pair of hose sections, the swivel member having male and female swivel members with underlap and overlap portions, respectively, forming radially-facing annular ball grooves between which bearing balls are captured to provide swiveling and to hold the swivel device together, and a seal between the swivel members, preferably a ring seal positioned between a pair of axially-facing opposed seal-abutment surfaces. The invention also involves hose-end couplings on swivel members of a swivel device, the couplings each having a sleeve member over and permanently secured to a hose section and being adapted for snap-engagement with one of the swivel members.

Abstract: A hose swivel connection apparatus for connecting a pair of hose sections, the swivel member having male and female swivel members with underlap and overlap portions, respectively, forming radially-facing annular ball grooves between which bearing balls are captured to provide swiveling and to hold the swivel device together, and a seal between the swivel members, preferably a ring seal positioned between a pair of axially-facing opposed seal-abutment surfaces. The invention also involves hose-end couplings on swivel members of a swivel device, the couplings each having a sleeve member over and permanently secured to a hose section and being adapted for snap-engagement with one of the swivel members.

Abstract: In order to protect an angular movable or sidewards bendable hose, such as e.g. a protective hose for supply lines or cables, on a machine or robot against bending and therefore premature wear, in the case of a device (1) for holding such a hose (2), the invention provides at least one holding area (3) for the at least axial holding of the hose (2) and with at least one one-sided support area (4) surrounding the hose (2) and extending towards the free end (4.2).

Abstract: For connecting flexible corrugated hoses, which are not provided with fittings, for transporting preferably gaseous media in connection with high-pressure applications, a holder 3 is provided, which receives an exposed end of the corrugated pipe 6 of the flexible corrugated hose 2 and is pressed together with it to form a metallic seal. The metallic seal is achieved by the surface pressure between the interior wall 18 of an element 16 of the holder and the ribs 8 of the corrugated pipe 6. Elastomeric seals 24, 25, as well as a soldering joint 34, if desired, can be provided as aids. However, in connection with a preferred embodiment the required sealing is already achieved by the strong pressure against each other of the metallic exterior of the corrugated pipe 6 and the metallic interior of the element 16.

Abstract: A pipe coupling for joining two sections of pipe provides six degrees of freedom where the pipe coupling includes an inlet portion, an outlet portion disposed opposite the inlet portion, and an intermediate portion disposed between the inlet and outlet portions for providing relative movement between the inlet portion and the outlet portion. The intermediate portion has a plurality of corrugations disposed about a circumference of the pipe coupling and each corrugation includes first and second arms diverging from a common vertex toward the inlet portion and outlet portion, respectively. The arms diverge at substantially a forty-five degree angle forming a V-shape, and each arm terminates at a transition area where each arm of the corrugation blends with the inlet portion and outlet portion, respectively.

Abstract: A fitting for corrugated tubing has a body with an internal conduit therethrough and a centerline. The body further includes a distal end located on a first end of the body, the distal end having a first outer diameter and a cross sectional thickness. A channel is formed through an interior surface of the distal end, which channel extends circumferentially around the interior surface of the distal end. Thereby, a sealing material may be inserted into the channel, between the interior surface of the distal end and the internal conduit.

Abstract: A suction hose assembly for an upright type vacuum cleaner having an air inlet connected to one end of a flexible hose and a suction pipe at the other end. A connection portion movably connects the suction pipe to the flexible hose allowing the suction pipe to rotationally rotate relative to the flexible hose, including a pair of connection protrusions preferably formed on one end of either the suction pipe or flexible hose, and spaced from each other by a predetermined distance, a pair of connection grooves formed on one end of whichever the flexible hose or suction pipe that the connection protrusions are not formed on, to receive the pair of connection protrusions, and at least one guide protrusion provided between a contact surface defined between the connection protrusions and a contact surface defined between the connection grooves, to reduce area of contact defined between the contact surfaces.

Abstract: A connecting filling (1) used for fixing peripherally ribbed longitudinal bodies such as corrugated hoses (2), comprising a retaining bushing (3) into which the longitudinal body or corrugated hose (2) can be inserted in an axial direction and anchored by means of at least one locking, retaining, projecting element which, when insertion occurs, is radially offset in an outer direction and engages with a recess running along the periphery of the longitudinal body or corrugated hose (2), for instance a corrugation trough (2a). A retaining ring (4) which is fixed in an axial direction inside the retaining bushing (3) is used as a retaining projecting element. The ring can be expanded in an elastic manner in a radial direction until the inner diameter thereof is at least as large as the largest outer diameter of the longitudinal body or an undulation of the corrugated hose (2). The retaining ring (4) can be offset when the corrugated hose (2) is inserted and can engage with a recess or a corrugation trough (2a).

Abstract: A conduit defining a continuous conduit passage extending from a first opening to a second opening includes a plurality of flexible, tubular, corrugated sections, each defining at least a portion of the conduit passage therethrough. A plurality of tubular, non-corrugated sections are merged with at least one of the corrugated sections and define at least a portion of the conduit passage therethrough. The plurality of corrugated sections and the plurality of non-corrugated sections are arranged in alternating relation.

Abstract: The present invention provides an apparatus and method for stabilizing a joint between two sections of corrugated pipe. A first section of corrugated pipe is associated with a second section to form a joint. One flexible member with two ends is looped around the first section of pipe, secured against a corrugation, and the two ends are associated and tightened. A section of the flexible member is left as a tail. A second flexible member is installed the same way on the second section of pipe, again with a section left as a tail. Each tail is then stretched across the joint, threaded between the other flexible member and pipe, brought back across the joint, and cinched forming two axially aligned supports secured against a corrugation, such that two axially aligned support are formed.

Abstract: A single flare tube, and a joint structure of the single flare tube makes a flare of the single flare tube hardly deformed plastically. Additionally, a tensile stress remains lower and is lower when the single flare tube is fastened. A joint structure of the single flare tube coupled with a union includes a single flare tube having a tube and a flare, a flare nut having a thread and a through-hole that receives the tube of the single flare tube, and a union having a thread for coupling with the thread of the flare nut. A width of a narrow inner circumferential groove of a radially outward extending part of the flare is substantially zero and stays substantially zero when the single flare tube is pushed against and coupled with the union by fastening the threads of the flare nut and the union together. Additionally, an internal diameter of the inner circumferential groove preferably is smaller than an external diameter of the tube.

Abstract: A pipe-end-connecting joint comprisse a nipple 1 inserted in the pipe end, a holder 2 for tightening the outer circumference of the pipe end, and an elastic packing 3 divided into half parts and attached in the holder 2. The nipple 1 includes a tubular portion 11 provided in one longitudinal end side thereof so as to be inserted in the pipe end, a connection portion 12 provided in the other longitudinal end side thereof so as to be connected to another joint, and a flange portion 13 provided in a longitudinal intermediate portion thereof so as to protrude outward.

Abstract: A manually guided suction device or blower is provided that has a housing in which is formed a spiral blower path in which is disposed an impeller that is rotatably driven by a drive motor. The spiral blower path has an air-conveying air inlet and an air-withdrawing outlet. A connector is provided for the detachable connection of an air-conveying connection conduit, whereby when the connection conduit is mounted it overlaps with the connector, which is secured to the housing, over a prescribed axial length. To achieve a mechanically secure connection, an annular sealing element is held in a groove in a surface of the connector or connection conduit in the overlap region, wherein over the entire circumference thereof, the sealing element projects beyond such surface.

Abstract: A hose for transporting preferably gaseous media at high temperatures and under high pressure has a corrugated interior surface with depressions and elevations, and at least one insertion element that can be inserted in one end. The hose is characterized in that, in the region of contact between the interior surface of the hose and the exterior surface of the insertion element, at least one gasket element of crystalline material is provided. The gasket element is metal, preferably a lead or copper alloy.

Abstract: A connection device for fitting to a member, particularly to a corrugated flexible pipe (146,246,446) formed with a series of spaced annular grooves, the comprising first and second tubular bodies (10, 11) coupled together, in use, with the pipe received in an open end of tHE first body (10). The first body has a plurality pf resilient lugs (14) with respective inwardly directed projections (17) at the ends thereof to be received in one of the said grooves to grip the pipe. The two bodies can be relatively angularly moved between a neutral position of the device, where the pipe is retained by the resilience alone of the lugs, an unlocked position, where the lugs are released from the pipe, and a locked position, where the lugs are forced into locking engagement with the pipe, movement of the lugs being controlled by cam formations a (29) extending from the end surface of the second body (11).

Abstract: A coupling for a corrugated pipe has two retainers hinged integrally with the coupling so that they can be folded down to project through apertures in the coupling and engage between corrugations on the pipe. When folded down in full engagement with the pipe, spring levers on opposite sides of the retainers engage under ledges in the aperture. The levers cannot engage when a retainer does not fully engage between the corrugations thereby making it apparent that the retainer is not fully engaged.

Abstract: A coupling for the end of a corrugated pipe has two catches integrally moulded with the housing of the coupling. The catches are hinged at one end and have a tooth at their other end that engages between the corrugations on the pipe. Two undulating webs link the other end of the catches with the housing to provide an additional resilient restoring force acting on the catches.

Abstract: A coupling for a corrugated pipe is moulded from a plastics material with two locking arms on opposite sides. The locking arms are hinged at one end and have an inwardly-projecting tooth at their other end shaped to extend between corrugations on the pipe. One side of each locking arm is formed with a stop that projects beyond the tooth and is adapted to contact a corrugation on the pipe when force is applied to pull the pipe out of the coupling, so as to limit inward deflection of the locking arms.

Abstract: A corrugated spiral pipe with a coupling device comprises a pipe body 10, a pair of flanges 20, and a pair of binding bands 30. The pipe body 10 has a cylindrical shape and is prepared to have a spirally corrugated shape 11. The pair of the flanges 20 are formed in one body of outer circumferences of both end portions of said pipe body 10, each of the flanges 20 having a large outer diameter portion at an end portion of the flange 20 and a small outer diameter portion 21 at a longitudinally inside portion of the flange 20.