EP0053456B1 - Arch formers - Google Patents

Arch formers Download PDF

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Publication number
EP0053456B1
EP0053456B1 EP81305476A EP81305476A EP0053456B1 EP 0053456 B1 EP0053456 B1 EP 0053456B1 EP 81305476 A EP81305476 A EP 81305476A EP 81305476 A EP81305476 A EP 81305476A EP 0053456 B1 EP0053456 B1 EP 0053456B1
Authority
EP
European Patent Office
Prior art keywords
curved
edge
arch
joint
beading
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
EP81305476A
Other languages
German (de)
French (fr)
Other versions
EP0053456A2 (en
EP0053456A3 (en
Inventor
Albert George Sawyer
Colin John Homewood
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.)
TANTALIC ACOUSTICAL ENGINEERING LIMITED
Original Assignee
TANTALIC ACOUSTICAL ENGINEERING Ltd
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 TANTALIC ACOUSTICAL ENGINEERING Ltd filed Critical TANTALIC ACOUSTICAL ENGINEERING Ltd
Priority to AT81305476T priority Critical patent/ATE6683T1/en
Publication of EP0053456A2 publication Critical patent/EP0053456A2/en
Publication of EP0053456A3 publication Critical patent/EP0053456A3/en
Application granted granted Critical
Publication of EP0053456B1 publication Critical patent/EP0053456B1/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster
    • E04F13/04—Bases for plaster
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C2003/023—Lintels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster
    • E04F13/04—Bases for plaster
    • E04F13/06—Edge-protecting borders
    • E04F2013/061—Edge-protecting borders for arched or curved edges

Definitions

  • This invention relates to an arch former for use in building arches.
  • a former which has achieved wide acceptance is described in our British patent application No. 45733/77 (1590298 published 28 May, 81) and comprises an arch former comprising at least one pair of similarly shaped members made of expanded metal, each member having a curved wall to one edge of which is attached a vertical wall by bending and interlocking adjacent margins of the curved wall and vertical wall, the curved walls forming the ceiling of the arch and the vertical walls forming the corner pieces.
  • plasterers would prefer to have what is known as a "plaster stop" which gives the plasterer a rib at the corner of the joint which will stand proud of both adjacent surfaces viz. the vertical surface and the underneath curved arch surface. Such a projecting rib will serve to indicate depth of plaster and an edge to the plaster.
  • US-A-1782147 discloses a complex plaster stop formed from the lateral edges of the curved wall and US-A-1979701 discloses a plaster stop formed from the vertical wall.
  • US-A-2005572 describes an arch former comprising sheets of expanded metal connected by means of prongs or lugs to a corner bead formed from a strip of sheet metal.
  • the object of the present invention is to provide such a rib in a manner which is relatively simple and cheap.
  • arch former having an vertical flat part provided with a recess- having a curved edge and a curved part at right angles to the vertical part the two parts being joined together by a curved joint at said edge and a separately formed edge beading extending partly or wholly around said joint made of a strip of perforated sheet metal bent to a cross-sectional shape having a flange attached to the underneath curved surface of said curved part and provided with a beading that extends downwardly, laterally and upwardly so as to provide a plaster stop both below and laterally of the joint around said edge.
  • the strip is preferably expanded metal sheet that has been flattened.
  • the entire former may be made of such sheet.
  • the sheet may have 2.5 to 3.5 openings per centimetre and is made from steel sheet, openings being punched, the sheet then being stretched and the sheet being finally flattened by passing through rollers or by other means.
  • the joint may be made by means of a Pittsburgh lock joint forming machine.
  • the strip may be formed with its flange in a Pittsburgh seam machine which is normally used for flanging solid metal sheet for forming ducting, and has suitable flange bending wheels different from those used on a Pittsburgh lock joint forming machine.
  • Figure 2 shows the fitting of one of the parts with the beading strip in accordance with the invention.
  • the former is made of four identical parts 10 each having a vertical flat wall 11 having a recess which has a curved lower edge 12 and a curved wall 13 at right angles to the vertical wall joined to the lower edge 2 by a Pittsburgh lock joint 16 ( Figure 2).
  • a bead strip is formed on a Pittsburgh seam machine with a flange 19 and a beading 20.
  • the beading 20 has a downwardly extending part 21, a laterally extending part 22, and an upwardly extending part 23.
  • the strip is arranged on the former so as to extend partly or wholly around the joint and the flange is spot welded at 25 to the part 13.
  • the strip is then bent along the joint 16 and spot welded at intervals along the entire length of the joint.
  • the beading thus provides a depth A for vertical plaster and a depth B for underneath plaster while at the same time providing the plaster stop in both directions.
  • the strip also provides additional strength of the former which facilitates handling and transport.
  • the beading may be provided on either or both sides of the arch former.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Fats And Perfumes (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Building Environments (AREA)

Abstract

An arch former for use in building an arch has a perforated metal beading around the curved edge of the arch to provide a plaster stop both below and laterally of the joint at said curved edge.

Description

  • This invention relates to an arch former for use in building arches.
  • A former which has achieved wide acceptance is described in our British patent application No. 45733/77 (1590298 published 28 May, 81) and comprises an arch former comprising at least one pair of similarly shaped members made of expanded metal, each member having a curved wall to one edge of which is attached a vertical wall by bending and interlocking adjacent margins of the curved wall and vertical wall, the curved walls forming the ceiling of the arch and the vertical walls forming the corner pieces.
  • The interlocking of the margins was made in practice on a "Pittsburgh" lock jointing machine.
  • We have found that plasterers would prefer to have what is known as a "plaster stop" which gives the plasterer a rib at the corner of the joint which will stand proud of both adjacent surfaces viz. the vertical surface and the underneath curved arch surface. Such a projecting rib will serve to indicate depth of plaster and an edge to the plaster.
  • Arch formers provided with plaster stops are known. US-A-1782147 discloses a complex plaster stop formed from the lateral edges of the curved wall and US-A-1979701 discloses a plaster stop formed from the vertical wall. US-A-2005572 describes an arch former comprising sheets of expanded metal connected by means of prongs or lugs to a corner bead formed from a strip of sheet metal.
  • The object of the present invention is to provide such a rib in a manner which is relatively simple and cheap.
  • We tried various possibilities before arriving at the present invention. Thus we tried attaching wire to the curved edge by means of loops attached by welding but this was too time consuming and the wire had to be rolled to the exact curvature before welding. We tried also making a strip with two flanges for welding but it was necessary to cut V-shaped openings in the flanges to permit bending to the required curvature and this again was too time consuming. We further tried what is known as "edge beading" but this cannot be bent to a smooth curve.
  • We finally had the idea of the present invention which has proved highly satisfactory.
  • According to the present invention we provide as arch former having an vertical flat part provided with a recess- having a curved edge and a curved part at right angles to the vertical part the two parts being joined together by a curved joint at said edge and a separately formed edge beading extending partly or wholly around said joint made of a strip of perforated sheet metal bent to a cross-sectional shape having a flange attached to the underneath curved surface of said curved part and provided with a beading that extends downwardly, laterally and upwardly so as to provide a plaster stop both below and laterally of the joint around said edge.
  • The strip is preferably expanded metal sheet that has been flattened. The entire former may be made of such sheet. The sheet may have 2.5 to 3.5 openings per centimetre and is made from steel sheet, openings being punched, the sheet then being stretched and the sheet being finally flattened by passing through rollers or by other means.
  • The joint may be made by means of a Pittsburgh lock joint forming machine. The strip may be formed with its flange in a Pittsburgh seam machine which is normally used for flanging solid metal sheet for forming ducting, and has suitable flange bending wheels different from those used on a Pittsburgh lock joint forming machine.
  • The invention will be further described by way of example with reference to the accompanying diagrammatic drawings wherein:-Figure 1 is a perspective view showing the general design of a four-part arch former; and
  • Figure 2 shows the fitting of one of the parts with the beading strip in accordance with the invention.
  • As shown in Figure 1 the former is made of four identical parts 10 each having a vertical flat wall 11 having a recess which has a curved lower edge 12 and a curved wall 13 at right angles to the vertical wall joined to the lower edge 2 by a Pittsburgh lock joint 16 (Figure 2).
  • A bead strip is formed on a Pittsburgh seam machine with a flange 19 and a beading 20. The beading 20 has a downwardly extending part 21, a laterally extending part 22, and an upwardly extending part 23.
  • The strip is arranged on the former so as to extend partly or wholly around the joint and the flange is spot welded at 25 to the part 13. The strip is then bent along the joint 16 and spot welded at intervals along the entire length of the joint.
  • The beading thus provides a depth A for vertical plaster and a depth B for underneath plaster while at the same time providing the plaster stop in both directions.
  • The strip also provides additional strength of the former which facilitates handling and transport.
  • The beading may be provided on either or both sides of the arch former.

Claims (2)

1. An arch former for use in building an arch comprising a vertical flat part (11) provided with a recess having a curved edge (12) and a curved part (13) at right angles to the vertical part the two parts being joined together by a curved joint (16) at said edge characterized by a separately formed edge beading (20) extending partly or wholly around said joint (16) made of a strip of perforated sheet metal bent to a cross-sectional shape having a flange (19) attached (25) to the underneath curved surface of said curved part (13) and provided with a beading that extends downwardly (21) laterally (22) and upwardly (23) so as to provide a plaster stop both below and laterally of the joint around said edge.
2. An arch former as claimed in claim 1 having two said vertical parts with the curved part between them, all these parts and the edge beading being made of flattened "expanded" perforated metal sheet, the flange (19) being attached to the curved part (13) by spot welding (25).
EP81305476A 1980-12-01 1981-11-19 Arch formers Expired EP0053456B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81305476T ATE6683T1 (en) 1980-12-01 1981-11-19 ARCH-SHAPED PERMANENT FORMWORK.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8038431 1980-12-01
GB8038431 1980-12-01

Publications (3)

Publication Number Publication Date
EP0053456A2 EP0053456A2 (en) 1982-06-09
EP0053456A3 EP0053456A3 (en) 1983-01-19
EP0053456B1 true EP0053456B1 (en) 1984-03-14

Family

ID=10517684

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81305476A Expired EP0053456B1 (en) 1980-12-01 1981-11-19 Arch formers

Country Status (5)

Country Link
EP (1) EP0053456B1 (en)
AT (1) ATE6683T1 (en)
DE (1) DE3162697D1 (en)
HK (1) HK76184A (en)
SG (1) SG50484G (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2116599B (en) * 1982-03-11 1985-08-07 Expanded Metal Plaster lath bead
GB2175625B (en) * 1985-05-31 1988-08-24 Cd Truline Ltd Improvements in or relating to formers
US7712262B2 (en) * 2006-08-31 2010-05-11 Tom Scanlan Removable arch form assembly and method of installing
US10753101B1 (en) 2016-12-09 2020-08-25 Baton, LLC Artificial lightweight stone

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1676582A (en) * 1927-05-05 1928-07-10 Donald R Stuart Corner piece for buildings
US1782147A (en) * 1929-07-18 1930-11-18 Merryweather Thomas Metal arch member for openings
US1979701A (en) * 1931-04-27 1934-11-06 Merryweather Clyde Plastering base
US1988739A (en) * 1932-09-21 1935-01-22 Milcor Steel Company Corner bead
US2005572A (en) * 1933-08-09 1935-06-18 United States Gypsum Co Building arch construction
GB2015633B (en) * 1977-09-07 1982-12-01 Shackleton E A Arches for building

Also Published As

Publication number Publication date
HK76184A (en) 1984-10-19
SG50484G (en) 1985-03-29
ATE6683T1 (en) 1984-03-15
DE3162697D1 (en) 1984-04-19
EP0053456A2 (en) 1982-06-09
EP0053456A3 (en) 1983-01-19

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