Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L11/00—Hoses, i.e. flexible pipes
  • F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
  • F16L11/16—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics wound from profiled strips or bands
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
  • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
  • B29C65/58—Snap connection
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—General aspects dealing with the joint area or with the area to be joined
  • B29C66/05—Particular design of joint configurations
  • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
  • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
  • B29C66/112—Single lapped joints
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—General aspects dealing with the joint area or with the area to be joined
  • B29C66/05—Particular design of joint configurations
  • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
  • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
  • B29C66/112—Single lapped joints
  • B29C66/1122—Single lap to lap joints, i.e. overlap joints
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—General aspects dealing with the joint area or with the area to be joined
  • B29C66/05—Particular design of joint configurations
  • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
  • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
  • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—General aspects dealing with the joint area or with the area to be joined
  • B29C66/05—Particular design of joint configurations
  • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
  • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
  • B29C66/124—Tongue and groove joints
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—General aspects dealing with the joint area or with the area to be joined
  • B29C66/05—Particular design of joint configurations
  • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
  • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
  • B29C66/124—Tongue and groove joints
  • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
  • B29C66/12449—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue being asymmetric
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—General aspects dealing with the joint area or with the area to be joined
  • B29C66/05—Particular design of joint configurations
  • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
  • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
  • B29C66/124—Tongue and groove joints
  • B29C66/1246—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove
  • B29C66/12469—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove being asymmetric
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
  • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
  • B29C66/43—Joining a relatively small portion of the surface of said articles
  • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
  • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
  • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
  • B29C66/43—Joining a relatively small portion of the surface of said articles
  • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
  • B29C66/4329—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms the joint lines being transversal but non-orthogonal with respect to the axis of said tubular articles, i.e. being oblique
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
  • B29C66/49—Internally supporting the, e.g. tubular, article during joining
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L9/00—Rigid pipes
  • F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/56—Winding and joining, e.g. winding spirally
  • B29C53/58—Winding and joining, e.g. winding spirally helically
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
  • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2023/00—Tubular articles
  • B29L2023/22—Tubes or pipes, i.e. rigid

Definitions

• spirally wound tubes formed from plastics have teen made from soft rubber-like plastics or from rigid plastics that have been heated and softened and then wound into a spiral tubular configuration.
• a differential pressure or force is applied to the tarts of the strip being brought into contact with one .another for interlocking the edges of the ribbon to form a spiral joint.
• These parts are fed under differential force so that the diameter of the tube can be controlled according to the extent of the difference in the force applied to the two interengaging edges.
• the method of interengaging the two edges of the tube which are to be locked together is such that the application of this differential force forces these interengaging edges firmly together to give an effective joint.
• the invention comprises an improved elongated strip which includes a member, namely a sealing flap, which is generally parallel and flush with the main body portion of the strip, and thus the inner wall of the tube made thereby, extending substantially at right angles to the portion of the locking device, namely upstanding rib; which rib is generally of the type as described in the earlier referred to U.S. Patent No. 4,209,043.
• the member or sealing flap extends across the actual spiral seam joint onto the adjacent wall from which the opposite portion of the lock, namely the socket which receives the headed rib, is extended, and in this portion of the wall there is a recess equal to the dimensions of the aforesmentioned extended member or sealing flap, which is of such a configuration that its extreme edge can be feathered so that it tends to be somewhat resilient even in a rigid plastics material, so that when internal pressure is applied to the finished spirally wound tube, this extended member or sealing flap, with its feathered edge, will increase the seal.
• the mating surfaces can be bonded together thus providing a relatively large continuous sealing surface.
• the extending member or sealing flap can have locking protuberances on its upper surface that can engage in the configuration created in the surface of the mating parts.
• FIG. 1 is a portion of a tube in cross section showing the two edges of the strip which interlock to form a spiral seam.
• FIG. 2 shows a further embodiment of the invention similar to that of FIG. 1.
• the body portion 1 of the strip has a number of upstanding webs 2 on it, each of which have webs or enlarged end portions 4 of preferably a "tee" configuration. That is, webs 2 comprise the upstanding portion 3 and the enlarged end portion 4.
• the functions of these webs are more folly set forth in the above-referenced U.S. Patent No. 4,209,043, which patent, to the extent it is consistent with this disclosure, is hereby incorporated by reference.
• a first longitudinal edge 5 of the strip has a shorter locking rib 6.
• this rib 6 is headed and is provided with a hook 7 at its top arranged to form a ridge 3 to engage, when wound into tubular form, a corresponding ridge 9 of extension 10 at the second longitudinal edge 11 of the body portion 1 of the strip.
• the web portion 3 including a socket 12 which mechanically locks over the locking rib 6.
• lock-web 13 projects angularly upwardly so that this part 13 can have its extreme edge 14 engage beneath the enlarged end portion 4 of the first full web 3 at the first edge 5 of the strip such as more fully set forth in the above-referenced patent.
• An extended tapering sealing flap 15 is provided on the edge 3 of the strip and outwardly beyond the shorter locking rib 6.
• the sealing flap 15 is arranged to engage a mating surface 16 en the second edge 11 of the strip body portion 1 en the side of the body portion 1 opposite socket 12 when pressure is exerted on the inside of the tube.
• the relatively thin and resilient sealing flap 15 is forced against the mating surface 16.to increase the fluid-tight seal in the manner of a hydraulic cup washer.
• An optional feature of the invention is the provision of a second resilient sealing flap 15 which is integral with the lock-web 13 and which projects axially from the base of the lock-web 13. With the strip joined together in a tubular form, the sealing flap 15' resiliently engages a corresponding mating surface 16' on the outer surface of the body portion 1 to seal the tube against the ingress of fluids, such as water.
• FIG. 2 shows a portion of a tube which is farmed with a strip which is identical to the strip shown in FIG. 1 in all respects not shown or described herein.
• portions of the tube and the strip of FIG. 2 corresponding to those shown in FIG. 1 are designated by corresponding reference characters preceeded by the nu meral 2.
• the first edge 25 of the body portion 21 of the strip includes sealing flap 215 which further includes a hook-like edge portion 217.
• flap 215 differs from sealing flap 15 of FIG. 1 in that flap 215 also includes an elongated central portion 218 of generally uniform thickness interconnecting the first portion of flap 215 connected to body portion 21 with the hook portion 217.
• the extreme edge of flap 215 is feathered as in FIG. 1.
• the other edge 211 of body portion 21 includes a mating surface 216 comprising a recess which is shaped to conform to the upper surface of sealing flap 215.
• Ridge 28 of hook 27 in this embodiment faces the opposite direction from that shown in FIG. 1.
• the corresponding ridge 29 of the extension 210 preferably is spaced from ridge 23 in order to provide a slight clearance.
• the strip and tube formed thereby of FIG. 2 employs the sealing flap 215 and the mating surface 216 to provide most, if not all, of the fluid sealing function.
• the addition of the hook portion 217 and the corresponding portion cf the mating surface 216 has a further advantage in assuring alignment and mating of flap 215 with surface 216.
• This fluid seal function is entirely or at least, mostly fulfilled by the separately provided sealing flap and mating surface. Due to the relatively flexible and/or resilient nature of the sealing flap, its sealing engagement with the corresponding mating surface would effect only minimally the operation of the remainder of the seam structure.
• the sealing flaps 15, 15', and 215 can be longitudinally corrugated at the mating surface or otherwise formed to still further increase the sealing action.
• a thermoplastic material of a softer characteristic than the rest of the strip could be extruded onto mating surfaces 16, 16', or 216, or sealing flaps 15, 15', or 215 by known techniques to aid in sealing at these mutually mating surfaces.
• sealing flaps 15, 15', and 215 could be initially formed so as to be mechanically deflected by their respective mating surfaces 16 and 16' when interengaged in the tube forming process, thus forming a continuous seal which is biased closed.
• FIG. 2 shows sealing flap 215 in phantom in its position as initially formed and prior to engaging mating surfaces 216. The final sealing position is as shown.
• a strip of un-plasticised PVC having longitudinal edges as in FIG. 2 had a total width from the outer edge of lock-web 213 to the feathered edge 213 of sealing flap 215 of about 20 cm.
• the total thickness of the strip was about 2.5 en and the body portion 21 had a thickness of about .5 on.
• the thickness of the elongated central portion of sealing flap 215 was about one-half the thickness of body portion 21 or about .25 en.
• This sealing flap extended outwardly past the headed rib 26 away from the rest of the strip about 1.8 cm.
• the hook portion 217 had a maximum thickness of about .381 cm. Tubes and pipes made from this strip were wound on the machine described supra.
• the tubes could be made to have a constant diameter ranging from about 45 cm to about 122 an, and could be made to have a rapidly changing diameter as the strip was spirally wound and the edges interengaged.
• a solvent cement was placed within the seam structure. The resulting seam was water-tight.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Shaping Of Tube Ends By Bending Or Straightening (AREA)

Priority Applications (3)

Applications Claiming Priority (4)

Publications (1)

Family

ID=25642422

Family Applications (1)

Country Status (8)

Cited By (7)

Citations (4)

• 1981
  • 1981-10-29 NZ NZ198816A patent/NZ198816A/en unknown
  • 1981-11-02 EP EP19810903162 patent/EP0064537A4/en not_active Withdrawn
  • 1981-11-02 JP JP56503692A patent/JPS57501924A/ja active Pending
  • 1981-11-02 WO PCT/US1981/001478 patent/WO1982001757A1/en not_active Application Discontinuation
  • 1981-11-02 BR BR8108866A patent/BR8108866A/pt unknown
  • 1981-11-12 FI FI813583A patent/FI813583A7/fi not_active Application Discontinuation
  • 1981-11-13 IT IT49708/81A patent/IT1172072B/it active
• 1982
  • 1982-05-26 DK DK238482A patent/DK238482A/da not_active Application Discontinuation

Patent Citations (4)

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