Source: https://patents.google.com/patent/EP0053456A2/en
Timestamp: 2019-02-20 12:56:10
Document Index: 341299138

Matched Legal Cases: ['application No. 45733', 'arts 10', 'art 21', 'art 22', 'art 23', 'art 13']

EP0053456A2 - Arch formers - Google Patents
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EP0053456A2
EP0053456A2 EP81305476A EP81305476A EP0053456A2 EP 0053456 A2 EP0053456 A2 EP 0053456A2 EP 81305476 A EP81305476 A EP 81305476A EP 81305476 A EP81305476 A EP 81305476A EP 0053456 A2 EP0053456 A2 EP 0053456A2
EP81305476A
EP0053456A3 (en
EP0053456B1 (en
Albert George Sawyer
Colin John Homewood
TANTALIC ACOUSTICAL ENGINEERING LIMITED
TANTALIC ACOUSTICAL ENG
TANTALIC ACOUSTICAL ENGINEERING Ltd
1980-12-01 Priority to GB8038431 priority Critical
1980-12-01 Priority to GB8038431 priority
1981-11-19 Application filed by TANTALIC ACOUSTICAL ENG, TANTALIC ACOUSTICAL ENGINEERING Ltd filed Critical TANTALIC ACOUSTICAL ENG
1981-11-19 Priority claimed from AT81305476T external-priority patent/AT6683T/en
1982-06-09 Publication of EP0053456A2 publication Critical patent/EP0053456A2/en
1983-01-19 Publication of EP0053456A3 publication Critical patent/EP0053456A3/en
1984-03-14 Publication of EP0053456B1 publication Critical patent/EP0053456B1/en
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.
This invention relates to an arch former for use in building arches.
A former which has achieved wide acceptance is described in our copending British patent application No. 45733/77 (1590298) 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 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..
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 a 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 an edge beading 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.
1. An arch former for use in building an arch comprising a 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 characterized by an edge beading (20) 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).
EP19810305476 1980-12-01 1981-11-19 Arch formers Expired EP0053456B1 (en)
GB8038431 1980-12-01
AT81305476T AT6683T (en) 1980-12-01 1981-11-19 Bogenfoermige permanent formwork.
EP0053456A2 true EP0053456A2 (en) 1982-06-09
EP0053456A3 EP0053456A3 (en) 1983-01-19
EP0053456B1 EP0053456B1 (en) 1984-03-14
ID=10517684
EP19810305476 Expired EP0053456B1 (en) 1980-12-01 1981-11-19 Arch formers
EP (1) EP0053456B1 (en)
DE (1) DE3162697D1 (en)
HK (1) HK76184A (en)
SG (1) SG50484G (en)
GB2116599A (en) * 1982-03-11 1983-09-28 Expanded Metal Plaster lath bead
GB2175625A (en) * 1985-05-31 1986-12-03 Cd Truline Ltd Formers
GB2015633A (en) * 1977-09-07 1979-09-12 Shackleton E A Arches for buildings
1981-11-19 DE DE19813162697 patent/DE3162697D1/en not_active Expired
1981-11-19 EP EP19810305476 patent/EP0053456B1/en not_active Expired
1984-07-14 SG SG50484A patent/SG50484G/en unknown
1984-10-11 HK HK76184A patent/HK76184A/en unknown
ENGINEERING, vol. 195, no. 5048, 18th January 1963, pages 82-84, Engineering Design Council, London (GB); "Product profile. Expanded metal". *
HK76184A (en) 1984-10-19
EP0053456A3 (en) 1983-01-19
SG50484G (en) 1985-03-29
DE3162697D1 (en) 1984-04-19
EP0053456B1 (en) 1984-03-14
US4433524A (en) 1984-02-28 Method and apparatus for slip-connector structural joint
1983-10-12 RAP1 Transfer of rights of an ep published application
Owner name: TANTALIC ACOUSTICAL ENGINEERING LIMITED
1983-10-14 ITF It: translation for a ep patent filed
Ref document number: 6683
Ref document number: 3162697
1984-09-27 PGFP Postgrant: annual fees paid to national office
1986-09-15 PGFP Postgrant: annual fees paid to national office
Payment date: 19860915