AU607614B2 - Cladding panel - Google Patents

Description

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SPECIFICATION

(OR IGINAL) %14 2M FOR OFFICE USE Class Int. Class Application Number: Lodged: 9omplete Specification-Lodged: Accepted: Published: Priority: ~'Related Art: Ii.] Name of Applicant: JOHN LYSAGHT (AUSTRALIA) LIMITED Address of Applicant: 55 Sussex Street, Sydney, New South Wales, Australia Actual Inventor: Kim Morgan and Neil Raymond Haines Address for Service:, SMITH SHELSTON I3EADLE Suite 7, 207 Great North Road FIVE DOCK NSW 2046 Complete Specification for 0hco invenition entitled: "CLADDING PANEL" 0 0 -7 C14:2 01/06~/09 The following statement is a full dlescription of this invention, including the best method of performing it known to me:- Complete after provisionals PI 8693 of 8 June 1988. PJ 2795 of 17 Feb1989 1 ii :9 ;il Y-U-~ C C C CT I C CC C C ct C c Cc 2 This invention relates to metal roof cladding panels of the kind which have mutually engageable edge ribs and perhaps similar intermediate stiffening ribs.

To reduce cost it is customary to make such panels from the thinnest steel or other base metal sheet consistent with the necessary structural strength. This does not reduce the effective life of the panels materially, which is dependent almost entirely on the corrosion resistance of the protective coating applied to the base sheet.

However it sometimes happens when thin panels are walked on, and this inevitably occurs when the panels are being laid, that linear marks appear in the protective and often ornamental coating, apparently produ'-ed by the flexing of the panel as a whole between the supporting battens or purlins of the roof structure. The marks are linear and extend from stiffening or edge ribs into the essentially flat pan between the ribs. Tests have shown that the marks in question are not deleterious to the functioning of the panel. Nevertheless they are objected to by many builders and other users, so requiring the replacement of essentially sound panels for cosmetic reasons.

An object of the present invention is to avoid the waste inherent in the replacement of such marked panels.

The invention achieves that object by providing, at or adjacent each junction of a rib and a pan, a bead of small cross-section, referred to as a sacrificial bead hereinafter, extending substantially parallel to the rib and projecting beyond the pan in the opposite direction to the rib.

By way of example, an embodiment of the above t ~I -e r i

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3 described invention is described in more detail hereinafter with reference to the accompanying drawings.

Figure 1 is a perspective view of a roof cladding panel according to the invention.

Figure 2 is a cross-sectional view of the panel of figure 1.

Figure 3 is an enlarged view of the part of figure 2 within the enclosure 3 of that figure.

Figure 4 is a view similar to figure 3 of a second embodiment of the invention.

The roof panel illustrated by figures 1 to 3 may be a coated steel panel and comprises a plurality of inverted channel stiffening ribs 5, inverted channel male and female tilt t I edge ribs 6 and 7 and a plurality of intermediate C 5 essentially flat pans 8. C cc C Insofar aa the foregoing features 5 to 8 are concerned the illustrated panel is conventional, but in accordance with the invention it also comprises a plurality of CCCCIsacrificial beads 9, disposed one at each junction of a pan 8 and a rib 5, 6 or 7 as the case may be. The beads 9 are very much smaller than the ribs and project from the pans in the opposite direction to the ribs.

For example, the illustrated panel may be made from a steel sheet .042mm. thick and the sacrificial beads 9 may be substantially semi-circular in cross section with an inner radius of say 1.5 mm.

When the panel is laid upon a batten, purlin or like ii support, the beads 9 project downwardly and ensure that any high pressure contact between panel and support is 4 substantially limited to the contact between the support and the bead.

It has been found that when a panel according to the invention is overloaded, as by being heavily walked upon, the crests of its beads may be deformed at the edges of the supports but no further damage or marking occurs; thus it would appear that this sacrificial deformation of the bead protects the remainder of the panel. Whether that be the reason or not, it has been found that the presence of the beads has the effect of preventing the objectional marking of the pans. Furthermore any deformation of the beads that Smay occur is not in itself objectionable as it does not Saffect the functioning of the panel and is normally not noticeable to a casual observer.

fl 5 The figure 4 embodiment is the same as the above described embodiment except that its sacrificial beads 9' are formed in the pans near to, but nevertheless spaced from, their junctions with the ribs. That is to say the beads 9' are adjacent the junctions rather than at the junctions. It has been found that the beads may be as far as 20mm from the ribs without affecting their effectiveness in protecting the pans from marking as aforesaid.

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Claims (4)

1. A coated metal roof cladding panel of the kind comprising at least one pan between two ribs extending longitudinally of the panel, characterised in that at, or adjacent, each junction of a rib and a pan, there is provided a bead of small cross-section extending parallel to the rib and projecting beyond the pan in the opposite direction to the rib.

2. A panel according to claim 1 wherein each bead is iwithin 20 mm of its adjacent junction.

3. A panel according to either claim 1 or claim 2 wherein Seach bead is of substantially semi-circular cross-section.

4. A panel according to claim 3 wherein the metal is steel substantially 0.42 mm thick and each bead has an !9 40" inner radius of substantially 1.5 mm. So A roof cladding panel substantially as described i s herein with reference to figures 1 to 3 or figure 4 of the accompanying drawings. Dated this first day of June 1989. JOHN LYSAGHT (AUSTRALIA) LIMITED Attorney: ROBERT G. SHELSTON Fellow Institute of Patent Attorneys of Australia of SMITH SHELSTON BEADLE i- -i