AU2004221789A1

AU2004221789A1 - Building element with varying surface characteristics

Info

Publication number: AU2004221789A1
Application number: AU2004221789A
Authority: AU
Inventors: Ronald Leslie Mann
Original assignee: Gram Engineering Pty Ltd
Current assignee: Gram Engineering Pty Ltd
Priority date: 2003-03-17
Filing date: 2004-03-17
Publication date: 2004-09-30
Anticipated expiration: 2024-03-17
Also published as: AU2004221789B2

Description

WO 2004/083571 PCT/AU2004/000326 BUILDING ELEMENT WITH VARYING SURFACE CHARACTERISTICS Technical Field 5 The present invention relates to a building element made from sheet material such as sheet metal strip. The invention has been developed especially, but not exclusively as elements for use in fences and is herein described in that context. The invention, however, may be 10 used in other applications, and is therefore not limited to that particular use. Background Art 15 Typical fences include fence posts made from timber or metal which are adapted to support barrier panels. Typically, each barrier panel comprises upper and lower rigid rails extending between the posts and in-fill means extending from rail to rail. The infill means may be 20 impervious rigid sheet, a roll formed profiled sheet, a rigid sheet of expanded metal, a plurality of spaced apart pickets, a sheet of woven wire mesh, or other substantially planar obstruction to the passage of people or animals between the posts. 25 In many applications, particularly for domestic and commercial use, the fencing can be quite prominent and as such there is a continuing demand for fencing which is visually appealing but which is relatively inexpensive to manufacture. 30 Summary of the Invention In the first aspect, the present invention relates to a building element made from sheet material having 35 opposite major surfaces extending between opposite longitudinal edges, margins of the sheet adjacent the longitudinal edges being turned out of a midplane of the WO 2004/083571 PCT/AU2004/000326 -2 sheet to form opposite profiled sections, wherein the major surfaces have different surface characteristics, and one profiled section has one of the major surfacea as its outer surface, and the other profiled section has the 5 other major surface as its outer surface. An advantage of the present invention is that the element is produced which, through specific profiling of the edge margins, gives it a varying surface characteristic across the element face by presenting one 10 major surface at one profiled edge, whilst presenting the other major surface along the other edge. Using this technique, elements of varying surface characteristic can be produced which are aesthetically pleasing. With the above arrangement at least one face has 15 discrete bands extending along the element each of which have a different surface characteristic so as to give that face of the element a "two toned" appearance. The characteristics which may vary between the two bands may be the colour, the surface finish, the surface texture or 20 the line. In a particular form, the profiled sections are provided to improve the structural characteristics of the element. In one form, each of the profiled sections is formed as a substantially closed section. The advantage 25 of this arrangement is that in a single profiling step, both the structural characteristics and the varying surface characteristics are formed in the element. This therefore enables the building element to be manufactured at a low cost as compared to an approach where the varying 30 surface characteristic is incorporated as a separate step to forming of the element. In one form, the element is produced from sheet metal strip and is profiled using roll formers. However it is to be appreciated that other techniques may be used to 35 produce the element such as through a folding or stamping operation, or through a combination of any of these techniques.

WO 2004/083571 PCT/AU2004/000326 -3 To produce the element in accordance with the present invention, one edge margin is profiled in a "reverse" direction to the other edge margin, in the sense that one edge margin is turned about one major surface, whilst the 5 other edge margin is turned about the opposite major surface. In one form, both the profiled sections are substantially identical in cross section. Preferably, the element is generally symmetrical about a plane that 10 extends transverse to the midplane of the sheet. With this arrangement, whilst one edge margin is profiled in the reverse direction from the other edge margin, the resulting element has a cross sectional profile which is substantially the same as if the edge margins were 15 profiled in the same direction. In one form, the element further comprises a web that extends between the opposite profile sections. In one form, the profiled sections extend outwardly from one side of the plane containing the web so that one face of the 20 element is generally flat. In one form, the element is made from a strip of steel coated with a protective coating of an alloy of aluminium and zinc. In one embodiment a further painted coating is applied to at least one of the major surfaces 25 so that the major surfaces have different surface characteristics. If both major surfaces have a painted coating, the colours of the painted surface are different to provide the different surface characteristics. In a further aspect, the invention relates to a 30 building element made from sheet material having opposite major surfaces extending between opposite longitudinal edges, at least one margin of the sheet adjacent a longitudinal edge being turned out of a midplane of the sheet to form a profiled section, wherein the major 35 surfaces have different surface characteristics, and wherein on at least one face of the building element, the profiled section has one of the major surfaces as its WO 2004/083571 PCT/AU2004/000326 -4 exposed surface, whereas an adjacent portion has the other major surface as its exposed surface. In a further aspect, the invention relates to a fence that incorporates a building element according to any form 5 described above. In one embodiment, the element is used as part of the barrier panel between the fence posts. In another form, the element is used as the fence posts of the fence. In yet another form, the fence construction is formed entirely from the above described elements. 10 Brief Description of the Drawings It is convenient hereinafter describe embodiments of the present invention with reference to the accompanying 15 drawings. It is to be appreciated that the particularity of the drawings and the related description does not supersede the generality of the preceding broad description of the invention. 20 In the drawings: Fig. 1 is a perspective view of a building element according the a first embodiment of the present invention; Fig. 2 is a cross section of the element of Fig. 1; Fig. 3 is a fence formed using building elements 25 having the profile of the element of Fig. 1; Fig. 4 is a perspective view of the building element of Fig. 1 having an alternative profile; Fig. 5 is a cross section of the element of Fig. 4; 30 Fig. 6 is a perspective view of the building element of Fig. 1 with another alternative profile; Fig. 7 is a cross section of the element of Fig. 6; Fig. 8 is a fence using a building element according 35 to Fig. 1 having yet a further alternative profile; and Fig. 9 to 11 illustrates modified versions of the building element of the first embodiment which WO 2004/083571 PCT/AU2004/000326 -5 incorporates a single profiled section. Detailed Description of the Preferred Embodiments 5 Figs. 1 and 2 illustrate a building element 10 that is formed from sheet metal strip. The strip has opposite major surfaces 11 and 12 that extend between longitudinal edges 13,14. The opposite major surfaces 11,12 have different surface characteristics to create a variation in 10 the appearance of the element as described in more detail below. Typically the sheet metal strip has a protective coating of zinc and aluminium. In one form, to form the different surface characteristics on the major surfaces 15 11,12, a painted coating is applied to one or both of the major surfaces. If both surfaces are painted, the colours of the coatings are different. It is to be appreciated that other techniques may be used to provide the different surface characteristics. For example, the colour of both 20 major surfaces may be generally the same, but the surface finish varying. This arrangement has particular application where the strip is stainless steel where it is possible to have a large range of finishes (i.e. gloss, satin, burnished etc.). 25 The element 10 is profiled (typically by passing the sheet metal strip through a roll former) to include the profiled sections 15, 16 at the margins of each of the two longitudinal edges. In the illustrated form of Figs. 1 and 2, the profiled sections 16,17 are in the form of circular 30 hollow sections. The element further includes a web portion 18 which is formed by a mid section of the sheet strip, and which interconnects the profiled sections 16,17. The circular hollow sections are substantially 35 identical and extend outwardly from one side of the web 18 so that one face 19 of the element is generally flat whereas the other face 20 has the profile sections 16,17 WO 2004/083571 PCT/AU2004/000326 -6 projecting from the web 18. As best illustrated in Fig. 2, the element 10 has one edge margin profiled in a "reverse" direction to the other edge margin. With this arrangement one of the profiled 5 sections 16 is turned about one of the major surfaces 12, whereas the other profiled section 17 is turned about the other major surface 11. With this arrangement, one face 20 of the element has one profiled section 16 presenting one major surface 11, whereas the other profiled section 10 17 presents the other major surface 12. As the major surfaces have varying surface characteristics (either by different painted coatings or the like) the element has a varying surface characteristic across each of the opposite faces 19, 20. In particular, each face has a "two toned" 15 appearance with different coloured bands extending along the element. A transition section 21 displaces one of the profiled section 17 relative to the web 18 so that it aligns with the other profiled section 16. This enables the element 20 to be generally symmetrical about a plane transverse to the web 18, and to allow one face 19 to be relatively flat. The element 10 is ideally suited for use in fence construction as best illustrated in Fig. 3 where a picket 25 type fence 30 is shown. In this arrangement, both the pickets 31 and the rails 32 are formed from elements having the profile as shown in figures 1 and 2. To make efficient use of the material, the pickets 31 are of a smaller size than the rails 32 as illustrated in Fig. 3. 30 The element 10 is ideally suited for this application as the profiled sections 16 and 17 provide sufficient rigidity to the element to enable it to be used as either the picket 31 or the rail 32. The elements can also be easily interconnected by being secured back to back on 35 their respective flat faces 19. In addition, the different surface characteristics provide the two toned effect, thereby increasing the visual interest to the WO 2004/083571 PCT/AU2004/000326 -7 fence 30. Figs. 4 and 5 illustrate a variation in the element 10. As the element 40 of Figs. 4 and 5 include many of the features of the element 10 disclosed in Figs. 1 and 2, 5 like features have been given like reference numerals. With the element 40, the sheet metal strip is profiled to form the profiled sections 16 and 17 as square hollow sections rather than as round hollow sections as shown in the earlier embodiment. In other respects the element 40 10 is substantially the same and in particular includes the arrangement where one edge margin is profiled in a reverse direction to the other edge margin. Again, the major surfaces 11, 12 are designed to have different surface characteristics to provide the varied appearance to the 15 element 40. The element 50 illustrated in Figs. 6 and 7 disclose a further embodiment where the profiled sections 16, 17 are formed as hexagonal closed section. Again, the characteristic profiling of the element is provided so 20 that one hollow section presents a different major surface of the strip than the other profiled section 17. Fig. 8 illustrates a fence which is constructed using elements 61, 62 which are a further variation of that disclosed in figure 1. In this embodiment, the elements 25 include hollow sections 16 and 17 formed as triangular closed sections. In other respects the elements are the same as that disclosed in the earlier embodiments. The Figs. 9 to 11 illustrate modified versions (70, 80 and 90) of the elements 10, 40 and 50. In each of 30 these modified versions the element has only a single profiled section 16. With this arrangement, one edge margin (71, 81,91) of each element remains as flat strip. With this arrangement, one face 19 of the element presents only one of the major surfaces 11 whereas the other face 35 20 presents both major surfaces thereby having a two toned effect on that face. In a further alternative arrangement (not shown) each WO 2004/083571 PCT/AU2004/000326 -8 of the edge margins of the strip may be profiled to form a box section with each section being formed in the same direction but being spaced apart by a section web. In that arrangement, the element presents on one face 5 (typically 20) an arrangement where there is three coloured bands with both the profiled sections presenting one of the major surfaces 11 whilst the web intermediate the profiled sections presenting the other major surface. Accordingly, the present invention provides a 10 building element which is made from sheet metal which is profiled so as to create rigidity in the element through the incorporation of profiled sections and also a varying surface characteristic so as to enhance the visual appeal of the element. 15 In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, 20 i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention. Variations and/or modifications may be made to the parts previously described without departing from the 25 spirit or ambit of the invention.

Claims

1. A building element made from sheet material having opposite major surfaces extending between opposite 5 longitudinal edges, margins of the sheet adjacent the longitudinal edges being turned out of a midplane of the sheet to form opposite profiled sections, wherein the major surfaces have different surface characteristics, and one profiled section has one of the major surfaces as its 10 outer surface, and the other profiled section has the other major surface as its outer surface.

2. A building element according to claim 1, wherein the major surfaces are different colours so that at least one 15 face of the building element is two toned.

3. A building element according to any preceding claim, wherein the profiled sections are formed as hollow closed sections. 20

4. A building element according to either claim 1 or 2, wherein the profiled sections are substantially identical in cross section. 25

5. A building element according to any preceding claim, further comprising a web extending between said opposite profiled sections.

6. A building element according to claim 5, wherein 30 both profiled sections extend outwardly from one side of a plane containing said web, so that one face of the element is generally planar.

7. A building element according to any preceding claim, 35 wherein the sheet material is formed from sheet metal strip. WO 2004/083571 PCT/AU2004/000326 - 10

8. A building element made from sheet material having opposite major surfaces extending between opposite longitudinal edges, at least one margin of the sheet adjacent a longitudinal edge being turned out of a 5 midplane of the sheet to form a profiled section, wherein the major surfaces have different surface characteristics, and wherein on at least one face of the building element, the profiled section has one of the major surfaces as its exposed surface, whereas an adjacent portion has the other 10 major surface as its exposed surface.

9. A fence post element comprising a building element according to any preceding claim. 15

10. A fence incorporating a plurality of fence post elements according to claim 8 wherein said fence post elements comprise at least part of a barrier panel of said fence.