AU7279596A - A collapsible core - Google Patents

A collapsible core

Info

Publication number
AU7279596A
AU7279596A AU72795/96A AU7279596A AU7279596A AU 7279596 A AU7279596 A AU 7279596A AU 72795/96 A AU72795/96 A AU 72795/96A AU 7279596 A AU7279596 A AU 7279596A AU 7279596 A AU7279596 A AU 7279596A
Authority
AU
Australia
Prior art keywords
pipe
longitudinal axis
collapsible core
shell
areas
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.)
Abandoned
Application number
AU72795/96A
Inventor
Johannes Hvidegaard
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.)
Pedershaab AS
Original Assignee
Pedershaab AS
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 Pedershaab AS filed Critical Pedershaab AS
Publication of AU7279596A publication Critical patent/AU7279596A/en
Abandoned 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
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/86—Cores
    • B28B21/88—Cores adjustable, collapsible or expansible

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Materials For Medical Uses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Dental Preparations (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

A collapsible core for casting e.g. tubular well articles, comprising an annular shell (1) which substantially forms a pipe having a longitudinal axis extending between the ends of the pipe, said shell (1) being flexurally flexible about the longitudinal axis of the pipe. According to the invention, the shell (1) has at least two first areas separated by at least one second area (A), said areas extending between the ends of the pipe, said second area (A) having a flexural flexibility about the longitudinal axis of the pipe which is smaller than the corresponding flexural flexibility in the two first areas. This ensures that the collapsible core has a relatively high degree of collapse, while having an extremely stable shape.
AU72795/96A 1995-10-16 1996-10-15 A collapsible core Abandoned AU7279596A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK199501165A DK173581B1 (en) 1995-10-16 1995-10-16 The shrink core
DK1165/95 1995-10-16
PCT/DK1996/000441 WO1997014544A1 (en) 1995-10-16 1996-10-15 A collapsible core

Publications (1)

Publication Number Publication Date
AU7279596A true AU7279596A (en) 1997-05-07

Family

ID=8101728

Family Applications (1)

Application Number Title Priority Date Filing Date
AU72795/96A Abandoned AU7279596A (en) 1995-10-16 1996-10-15 A collapsible core

Country Status (6)

Country Link
EP (1) EP0855951B1 (en)
AT (1) ATE264736T1 (en)
AU (1) AU7279596A (en)
DE (1) DE69632260T2 (en)
DK (1) DK173581B1 (en)
WO (1) WO1997014544A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2541983A1 (en) * 2003-10-07 2005-04-14 Vertech Hume Pty Ltd Vertical moulding of long concrete articles
DE102012220814A1 (en) 2012-11-14 2014-05-15 Johann Schlüsselbauer Shrinking core for mold during production of hollow bodies of concrete, has core casing whose opposite longitudinal edge portions is connected with partially elastomeric connecting web in spread position at shear-resistant manner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE212494C (en) *
US1101204A (en) * 1913-01-30 1914-06-23 C F Massey Company Collapsible core for concrete pipes.
US1540185A (en) * 1924-07-21 1925-06-02 Claude G Richards Mold
US3570802A (en) * 1968-10-10 1971-03-16 Hydro Conduit Corp Concrete-molding apparatus having an inner mold member with variable dimension periphery

Also Published As

Publication number Publication date
ATE264736T1 (en) 2004-05-15
EP0855951A1 (en) 1998-08-05
WO1997014544A1 (en) 1997-04-24
DE69632260D1 (en) 2004-05-27
EP0855951B1 (en) 2004-04-21
DK173581B1 (en) 2001-03-26
DK116595A (en) 1997-04-17
DE69632260T2 (en) 2005-06-23

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