Abstract: In a fiber-reinforced resin pipe for introducing and discharging a liquid, a pipe (1) is provided with a plurality of introduction/discharge parts (2) for introducing or discharging liquid that are arranged at intervals in the axial direction from a peripheral surface of the pipe.

Abstract: Coupling, comprising a first part (1) in the form of a male part and a second part (2) in the form of a female part, the male part can be brought into the female part and thereby form a ring shaped void (3) between the facing surfaces of male and female parts, which ring shaped void in the axial direction of the parts are delimited with an inner restriction (4) at an inner side and an outer restriction (5) at an outer side, and a feed-through (6) is arranged from the outer surface of the female part to the void (3), for injection of glue into the void, and a feed-through (7) is arranged from the void to the outer surface of the female part, for venting and leakage of glue when filling the void with glue, distinguished in that the feed-through (7) for venting and leakage of glue is arranged closer to the outer side of the void than the feed-through (6) for injection of glue.

Abstract: A part for connecting a fluid line to an opening of a container comprised of thermoplastic material or for closing the opening of the container has a first component and a second component of thermoplastic material. The first component has a surface to be connected to the container by forming a welded heat fusion joint. The first component has an insufficient diffusion barrier capability relative to hydrocarbon fuel. Compared to the material of the first component, the material of the second component has higher diffusion barrier capability, reduced swelling capability relative hydrocarbon fuel, higher mechanical strength, and higher thermal shape stability. The first component encloses the second component at least up to an injection location remote from the connecting surface. The material of the second component is injected into the still formable core of the material of the first component via the injection location.

Abstract: A fluid line coupling is disclosed for connection with hollow tubing. The coupling includes a body portion having a passageway for fluid communication with the tubing. A first wall extends from the body portion radially surrounding the passageway, and a second wall radially surrounds the first wall forming a pocket between the walls. The second wall includes an aperture for fluid communication with the pocket. An open ended aperture may be included in a radial array of apertures. The first wall may include a tapered surface for securing the tubing. A third wall may radially surround the second wall forming a well for an adhesive for filling the aperture and pocket. A second set of walls may extend in an axially opposite direction from the first set. The coupling may be included in a connection assembly with hollow tubing comprising a PVC material providing fluid communication with a medical instrument.

Abstract: A composite reinforced line pipe is manufactured by aligning first and second pipe segments each having a composite reinforcement wrapped circumferentially about a core, attaching the line pipes at a cut-back portion of their exposed core, wrapping a joint tape circumferentially about the cut-back portion, wrapping a resin reinforcement tape circumferentially about the joint tape, and curing the joint tape and resin reinforcement tape.

Abstract: A part for connecting a fluid line to an opening of a container comprised of thermoplastic material or for closing the opening of the container has a first component and a second component of thermoplastic material. The first component has a surface to be connected to the container by forming a welded heat fusion joint. The first component has an insufficient diffusion barrier capability relative to hydrocarbon fuel. Compared to the material of the first component, the material of the second component has higher diffusion barrier capability, reduced swelling capability relative hydrocarbon fuel, higher mechanical strength, and higher thermal shape stability. The first component encloses the second component at least up to an injection location remote from the connecting surface. The material of the second component is injected into the still formable core of the material of the first component via the injection location.

Abstract: This invention is a new and improved PVC conduit coupling (FIG. 1) designed specifically for the use of connecting PVC conduits together under roadways, asphalt, concrete and underground. A long, cylindrical, sleeve-type embodiment that has a greater Glue Surface Area (1) and a stop ring (4). This new invention utilizes the greater Glue Surface Area (1) that keeps conduits from pulling apart, giving the installer and the owner assurance of conduit continuity.

Abstract: In a pipe joint made of resin, a cap nut-like pressing ring is screwed to the outer periphery of a pipe receiving port of a joint body, and presses an inner ring from the outer side of a pipe member as a result of screw advancement toward the joint body. The inner peripheral face of an annular pressing portion of the pressing ring is formed into a straight shape. The inner diameter D of the annular pressing portion is set to be 1.0 to 1.1 times, preferably, 1.01 to 1.05 times the outer diameter d of the pipe member, and the length L of the straight inner peripheral face portion in the axial direction is set to be 0.2 to 1.0 times, preferably, 0.2 to 0.8 times the outer diameter d of the pipe member, whereby the rotational resistance in a process of fastening the pressing ring is reduced, so that the loss of fastening torque can be reduced and a predetermined sealing force and a predetermined slipping off resistance can be ensured.

Abstract: A screwable cable seal introduction device for employment at sleeves or housings having an introduction sheath onto which a union nut can be screwed. A press sleeve is located in the inside of the introduction sheath, an annular seal composed of sealing material and laterally arranged support rings being deformed with the press sleeve until the required adhesion of the sealing material at the sealing surfaces to be contacted is accomplished. An automatic pressure compensation subsequently occurs, so that no permanent pressure is exerted onto the introduced cable.

Abstract: A fiberglass pipe joint with threaded ends has rough surface areas adjacent to such ends which allow strap wrenches to be used to tighten the threads with a high torque that prevents leakage. The rough areas are formed by partially embedded sand grains which are sprinkled on the resin component prior to curing, or on a wet bonding material after curing.

Abstract: A method for manufacturing a filament reinforced plastic pipe including an integral bell, the method comprising the steps of winding a filament bundle, in a plurality of layers, around a mandrel having a cylindrical outer surface to form a pipe including a bell portion having a cylindrical inner surface, and machining the inner surface so that the inner surface is tapered.

Abstract: An end of a convoluted metal hose is connected to an adaptor having an end surface which is rounded to complement a contour of an endmost convolution. A straight section of the convoluted hose extends unbonded some distance through a bore in the adaptor, where it is welded in place. This way any flexing is by a section of the wrapping over the rounded end, the wrapping section being remote from any heat damage which may result from the welding. The internal transition between the bores of the hose and adaptor is straight and smooth, free of any crevice.

Abstract: A method and tool for fabricating composite shafts with at least one flared end. The tool includes a specially adapted end fitting for each flared end which define the angle and direction of flaring. The end fitting includes structure for conforming/compacting the composite material at the flared ends either during and/or after the composite build-up is completed and during cure. The conforming/compacting insures that the external surfaces of the flared ends achieve dimentional control and a machined like quality without the necessity of machining.

Abstract: A fiber-reinforced plastic pipe with a male-threaded and/or female-threaded end joint section having improved axial strength and thread contour, exhibiting a high degree of seal tightness, and withstanding a high internal pressure. The female threads comprise a first resin layer, a second fiber-reinforced resin layer having continuous filaments extending at an angle of 0.degree..+-.15.degree. to the longitudinal axis of the pipe, and a third fiber-reinforced resin layer having continuous filaments extending at an angle of .+-.85.degree. to 90.degree. to the longitudinal axis. The male threads comprise short fibers flocked in the radial direction on a fiber-reinforced plastic substrate layer and impregnated with a resin.

Abstract: The improved electrofusion joint and header for supplying hot water that perform satisfactorily at elevated temperatures as evidenced by high heat resistance, that exhibit good sealing property and that can be handled efficiently in mounting and various other operations have a crosslinked thermoplastic resin layer and at least one joining portion which comprises a non-crosslinked thermoplastic resin layer that is formed a as an integral part of said crosslinked thermoplastic resin layer in the area where it contacts a tubular member to be joined, and a heating electric wire provided either within or on the outer or inner surface of said non-crosslinked thermoplastic resin layer. Such electrofusion joint and header are applicable to any part of a piping system for supplying hot water and they will withstand use for a prolonged period.

Abstract: A pipe joint is provided wherein mating female and male threads are ground or scribed into the ends of the pipes to be joined. At least one of the scribed threads has a paste thread contact molded onto it so that the valley of the contact molded thread is below the crest of the scribed thread. Upon mating of the coupled pipe ends, the contact molded thread surface provides a smooth finish and a relatively low, consistent engagement and disengagement torque. The overlapped crests of the scribed male and female threads provide for mechanical interlock and correspondingly enhanced tensile strength in the joint. The invention is particularly suited to pipes made of resin reinforced with wound filaments, where the scribed threads can be cut shallowly to retain the strength of the body of the pipe and minimize cutting of the wound filaments.

Abstract: An electrically insulated pipeline joint for use in fluid or gas pipelines is disclosed. Such a joint is used to electrically insulate one section of a pipeline from an adjoining section pipeline. The joint is further designed to preclude physical failure therein and also to preclude leaks from forming therein, in the case of mechanical failure.

Abstract: A secondary containment pipe system disposed around a primary pipe system and comprising a joint that is divided along a central parting plane and has laterally projecting flanges that form internal passages for adhesive sealing cement, that is injected through ports while the joint is clamped together around secondary containment pipes. The joint has pipe sockets that have internal grooves that also are filled with injected cement, thus forming a continuous, uninterrupted seal around the interior of the joint, and also has spillover grooves and wells for minimizing leakage, and lateral aligning surfaces. The clamping means are C-shaped clips that can be left in place indefinitely. The secondary containment pipes also are divided, being formed by elongated pipe elements fitted together around the primary pipes and having snap-latching coupling means along their abutting edges.

Abstract: In a bicycle frame comprising a plurality of frame members which are selectively joined together at the ends thereof, each of the joints which support the head tube, the seat and the crank housing is a lug joint comprising a plurality of organic fiber layers partially wrapping the joined end portions of the frame members, the fibers composing each layer being oriented at different angles from the fibers in the adjacent layers, and all of these sheets being impregnated with resin which hardens to secure the sheets to the frame members. Web portions of these fiber layers also enclose a portion of the space between wrapped portions of the frame members, and each of these spaces is filled with a suspension of microballoons in hardended resin which cooperates with the web portions of the fibers layers to brace the joined frame members against movement toward each other during use of the bicycle.

Abstract: A composite structure comprises at least one ply comprising approximately parallel unidirected twines comprising helically-configured matrix-impregnated continuous strands of filament reinforcements to provide a flanged composite cantilever spring which serves as the principal constituent of a coupling structure. An interior ply of a coupling structure body member comprises unidirected longitudinal twines configured at a body member extremity to provide a flange member connected to a cantilever spring. An exterior ply is disposed transversely of and superimposed upon the interior ply to provide the cantilever spring hinge line. The composite cantilever spring can be constructed to deflect about either a straight or curved hinge line. A preferred tubular form of the coupling structure comprises at least one end configured as a polygonal array of flanged cantilever springs which serve as the socket end of a spring-lock coupling used to connect mating flanged spigot-end structures.

Abstract: A structure at a connection where at least two resin pipes are connected to each other end-to-end. The structure is characterized by annular resin body means provided on the inner periphery of the end of at least one of the resin pipes and having at least one end positioned in an annular recessed portion formed in the inner periphery of said one resin pipe. Since the above-mentioned end (which is more subject to the action of internal fluid than the other end) is positioned in the annular recessed portion, the resin body means is not eroded by the internal fluid.

Abstract: A thermosetting resin layer covers the outer peripheral surface of the nipple portion of a joint provided on one end of a connecting pipe. A hose having a reinforcing layer between a single- or double-layer inner tube and an outer tube is inserted over the nipple portion of the joint, and tightened by a caulked sleeve or clamp encircling the hose to form a joint structure. This joint structure provides a satisfactory seal for a long period of time, as its resin layer does not undergo any crystallization, but maintains elasticity.