AU686621B2 - Roofing profile - Google Patents

Description

P/00/0O11 Regulation 3.2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT 9**9 99 9 a .9 9 9 a, a a 9*aa

S.

9 **a 9* 9* 9*99 a Invention Title: ROOFING PROFILE Applicant: STRAMIT CORPORATION LIMITED The following statement is a full description of this invention, including the best method of performing it known to me:.

I

c VIWORMM(1%l~yoseyewoO0 0 la ROOFING PROFILE The present invention relates to a cladding sheet particularly adopted for use in domestic buildings. The profile is also well suited to fencing construction.

There are a large number of roofing sheet profiles on the market which consist of flat pan sections divided by angular These profiles, while commonly used for industrial buildings, are not commonly used for domestic buildings as the angular lines are generally perceived not to be aesthetically pleasing for that application.

Thus, corrugated iron dominates the market for domestic metal roofing. A further advantage of corrugated iron is that it is able to be curved to form a bull-nose and other curved roof shapes.

The present invention aims to provide an alternative to corrugated iron without the aesthetic disadvantage of the prior art.

A cladding sheet including a repeated pattern unit including crest and trough formations which are arranged equally about a centre plane of the profile, the 20 formations being of similar arcuate profile with the crest formation being disposed in an opposite direction to said trough formation, the pattern unit further including a ledge portion which directly connects said formations and which is centred o* about said centre plane.

C WifWOf=WDUOHNSONSYWOW.M OCI; 1 II I -2- The ledges preferably are substantially straight and extend along or are'~ angled across the centre plane.

Further preferred embodiments will now be described with reference to the accompanying drawings, in which: Fig. 1 is an end-view of a preferred sheet according to the invention; and Fig. 2 is a detail of one repeat pattern unit of the sheet of Fig. 1.

The illustrated sheet profile has a number of repeat units 10, the number and dimensions of which may be 'varied to suit the feed sheet from which the sheet is roll-formed. Each repeat unit consists of an arcuate crest 11 and a similar but oppositely profiled trough 12, and a pair of ledge portions 13 separating adjacent crests and troughs. These ledges slope slightly downwards from the crest to the trough and are centered about the centre plane of the roofing sheet.

The ledges are also of similar but opposite profile to each other, so that the pattern is 'symmetrical' if rotated about a longitudinal axis of rotation passing through the centre point of any ledge.

The side edges of each sheet have underlap 14 and overlap 15 portions allowing overlap between adjacent sheets. As shown in dotted lines in Fig. 2, the underlap portion 14 of an adjacent sheet follows the profile of the overlying crest and may have a I I -3substantially vertical leg 16 extending downwards to the level of the troughs 12 for providing support to the overlapped regions. For applications where it is desired to curve the sheet, the leg 16 is not provided and the underlap is extended to follow the profile to the bottom point of the trough 12.

The illustrated profile thus combines arcuate and angular features to result in an attractive alternative to corrugated iron for domestic roofing and walling purposes. The 'symmetrical' appearance of ,the profile also makes it well suited to fencing purposes as each neighbour is presented with a similar ,4 appearance.

It is believed that a further advantage of the inventive profiles is the ability to allow a degree of plastic curving, as the material of the sheet is equally distributed above and below the centre plane, similar to that exhibited by corrugated iron. The profile may also have a greater coverage than the corrugated profile w~-th equivalent crest and trough shape rolled from the same width feed, due to the ledge portion? extending substantially straight 1 e 25 across the profile.

While particular embodiments of this .nvention have been described, it will be evident to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential characteristics thereof. The present embodiments and examples are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than th.t foregoing description, and all changes which come within the meaning and range of equivalency of the I I -4claims are therefore intended to be embraced therein.

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Claims (11)

1. A cladding sheet including a repeated pattern unit including crest and trough formations which are arranged equally about a centre plane of the profile, the formations being of similar arcuate profile with the crest formation being disposed in an opposite direction to said trough formation, the pattern unit further including a ledge portion which directly connects said formations and which is centred about said centre plane.

2. A cladding sheet according to claim 1, wherein said ledge portion is substantially straight.

3. A cladding sheet according to claim 2, wherein said ledge portion extends along said centre plane.

4. A cladding sheet according to claim 1 or 2, wherein said ledge portion is angled across said centre plane. 15

5. A cladding sheet according to any preceding claim wherein said pattern unit includes a further said ledge portion, said further ledge portion being centred about said centre plane and directly connecti, j one of said formations to the other of said formations of an adjoining like pattern unit.

6. A cladding sheet according to any preceding claim including spaced apart 20 first and second longitudinal edge regions, the cladding sheet being arranged to be juxtaposed with a like cladding sheet with the first edge region overlapping the second edge region of the other sheet, and wherein said repeated pattern unit extends across said overlapping edge regions on at least one of opposite major surfaces of said sheet.

7. A cladding sheet iccording to claim 6, wher,3in the repeated pattern unit continues across said overlapping edge region on both of the opposite major surfaces of said cladding sheets,

8. A cladding sheet according to claim 7, wherein said first edge region terminates with a part of a crest formation and wherein said second edge region terminates at or adjacent to an outer margin of a said trough formation such that when the cladding sheet is in overlapping relationship with a like cladding sheet, E:DJ-;66080.94,DOC r 6 the overlapping edge regions extends along the majority of a said repeated pattern unit.

9. A cladding sheet according to claim 6, wherein said first edge region terminates with a part of a crest formation and wherein said second edge region includes a downwardly extending leg such that when the cladding sheet is in overlapping relationship with a like cladding sheet the downwardly extending leg is adapted to locate under the said part of a crest formation on said first edge region to support said first edge region.

A cladding sheet having a profile including a repeated pattern unit, said pattern unit being substantially as herein described with reference to the accompanying drawings.

11. A cladding sheet substantially as herein described with reference to the accompanying drawings. DATED: 30 September 1997 PHILLIPS ORMONDE FITZPATRICK Attorneys for oo$. 20 STRAMIT CORPORATION LIMITED I 4* so *ii *~ii CkW1NW0RMW0NWSYDN~rM0W' 14 0Cd