GB952869A - Method and apparatus for forming strip material into tube - Google Patents

Method and apparatus for forming strip material into tube

Info

Publication number
GB952869A
GB952869A GB101960A GB101960A GB952869A GB 952869 A GB952869 A GB 952869A GB 101960 A GB101960 A GB 101960A GB 101960 A GB101960 A GB 101960A GB 952869 A GB952869 A GB 952869A
Authority
GB
United Kingdom
Prior art keywords
tube
slots
strips
tabs
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB101960A
Inventor
Ainsley Neville Ede
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB101960A priority Critical patent/GB952869A/en
Publication of GB952869A publication Critical patent/GB952869A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
    • E02F5/101—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables forming during digging, e.g. underground canalisations or conduits, by bending or twisting a strip of pliable material; by extrusion
    • 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
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/48—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

952,869. Making drainage pipes. NATIONAL RESEARCH DEVELOPMENT CORPORATION. April 6, 1961 [Jan. 11, 1960; March 4, 1960], Nos. 1019/60[and 7843/60. Heading F2P. A method of forming a tube from two or more lengths of flexible sheet material, e.g. polyvinyl chloride, in the form of strips 38 having integral interlockable tabs 39 and recesses 41 formed along the longitudinal edges thereof, comprises curling the strips about the longitudinal edges thereof in troughed form and joining the curled strips together in side-by-side relationship by introducing the tabs of one edge of one strip into the co-operating recesses of an adjacent edge of another strip to form interlocked longitudinal seams in which the tabs are passed inwardly through the co-operating recesses with respect to the formed tube to lie against the inside surface of the tube. As shown, a vertical feeder conduit 25 and a former tube 26 extending horizontally are mounted behind a mole plough 10 carried by a tractor 14, the conduit carrying reels 32 of continuous strip material which are drawn down the interior of the conduit and around an inclined guide plate 35, rearwardly to the tube 26 and into a die 36, the finished tube then passing through a sleeve 37 and into a tunnel 15 formed by the mole. The die 36 comprises a guide block 43 and a pair of concave sheet metal guide troughs 44, 45, longitudinal slots 46 . . . 49 being formed in diagonally-opposite corners of the block. The slots 47, 48 extend longitudinally parallel to the axis of the block, but the slots 46, 49 extend obliquely to the longitudinal axis so that the pairs of slots 46, 47 and 48, 49 intersect one another. As two strips of material are simultaneously drawn through the die the slots 46, 49 progressively carry the slotted edges of the strips towards the tabbed edges lying in the slots 47, 48 until at the intersections of the slots the tabs 39 of one strip enter the slots 41 of the other strip. The tube thus formed is allowed to expand, due to the resilience of the material, to cylindrical form so that the tabs lie flat against the internal surface of the tube. The die may be modified to form tubes from three strips of material. Specification 851,746 is referred to.
GB101960A 1960-01-11 1960-01-11 Method and apparatus for forming strip material into tube Expired GB952869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB101960A GB952869A (en) 1960-01-11 1960-01-11 Method and apparatus for forming strip material into tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB101960A GB952869A (en) 1960-01-11 1960-01-11 Method and apparatus for forming strip material into tube

Publications (1)

Publication Number Publication Date
GB952869A true GB952869A (en) 1964-03-18

Family

ID=9714728

Family Applications (1)

Application Number Title Priority Date Filing Date
GB101960A Expired GB952869A (en) 1960-01-11 1960-01-11 Method and apparatus for forming strip material into tube

Country Status (1)

Country Link
GB (1) GB952869A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027150A1 (en) * 1979-10-05 1981-04-22 Kenichiro Takagishi Apparatus for forming and installing underground drainpipe
WO1988007897A1 (en) * 1987-04-13 1988-10-20 Carl August Witt Process and devices for the manufacture of pipes with longitudinal seams
GB2218176A (en) * 1988-04-21 1989-11-08 Roger William Lewis Fitments for trenching machines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027150A1 (en) * 1979-10-05 1981-04-22 Kenichiro Takagishi Apparatus for forming and installing underground drainpipe
WO1988007897A1 (en) * 1987-04-13 1988-10-20 Carl August Witt Process and devices for the manufacture of pipes with longitudinal seams
GB2218176A (en) * 1988-04-21 1989-11-08 Roger William Lewis Fitments for trenching machines
GB2218176B (en) * 1988-04-21 1992-01-02 Roger William Lewis Fitments for trenching machines

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