GB700543A - Tubing for use in forming ducts in concrete structures - Google Patents

Tubing for use in forming ducts in concrete structures

Info

Publication number
GB700543A
GB700543A GB2906651A GB2906651A GB700543A GB 700543 A GB700543 A GB 700543A GB 2906651 A GB2906651 A GB 2906651A GB 2906651 A GB2906651 A GB 2906651A GB 700543 A GB700543 A GB 700543A
Authority
GB
United Kingdom
Prior art keywords
tube
middle tube
lubricant
innermost
diameter
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
GB2906651A
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.)
IAN VOJACEK COCHRANE
Original Assignee
IAN VOJACEK COCHRANE
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 IAN VOJACEK COCHRANE filed Critical IAN VOJACEK COCHRANE
Priority to GB2906651A priority Critical patent/GB700543A/en
Publication of GB700543A publication Critical patent/GB700543A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/28—Cores; Mandrels
    • B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
    • B28B7/32—Cores; Mandrels adjustable, collapsible, or expanding inflatable

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Moulds, Cores, Or Mandrels (AREA)

Abstract

An inflatable tubular core is made of three concentric tubes The innermost tube is made of rubber or like elastic material, the middle tube is made of flexible material such as textile fabric and is treated with a lubricant, and the outermost tube is made of rubber or like elastic material. The outside diameter of the innermost tube is less than the inside diameter of the middle tube, and the inside diameter of the outer tube is less than the outside diameter of the middle tube. When the innermost tube is inflated through the usual valve, the middle tube takes the diameter and shape it is designed for and the outermost tube expands and assumes the condition of a stressed skin over the unstretched middle tube. The function of the lubricant is to enable the middle tube to slide relative to the other tubes, whereby folds are avoided. The lubricant may be vegetable oil or hydraulic brake fluid.
GB2906651A 1951-12-12 1951-12-12 Tubing for use in forming ducts in concrete structures Expired GB700543A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2906651A GB700543A (en) 1951-12-12 1951-12-12 Tubing for use in forming ducts in concrete structures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2906651A GB700543A (en) 1951-12-12 1951-12-12 Tubing for use in forming ducts in concrete structures

Publications (1)

Publication Number Publication Date
GB700543A true GB700543A (en) 1953-12-02

Family

ID=10285642

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2906651A Expired GB700543A (en) 1951-12-12 1951-12-12 Tubing for use in forming ducts in concrete structures

Country Status (1)

Country Link
GB (1) GB700543A (en)

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