WO2001077458B1

WO2001077458B1 - Roofing sheets and fixing

Info

Publication number: WO2001077458B1
Application number: PCT/ZA2001/000037
Authority: WO
Inventors: Allen Thomas Friel
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-06
Filing date: 2001-04-06
Publication date: 2002-04-04
Anticipated expiration: 2002-10-06
Also published as: AU5764201A; WO2001077458A1

Abstract

Widely used box type roof sheets, are fixed by concealed (non-perforating) fixings by means of indentations formed in the side walls of the ridges of the sheet profile and fixing clips engaging the indentations. Expansion and contraction of the roof sheets is accommodated by these fixings. Fixing strips can be used to locate the clips on the roof structure. Sliders which have profiles that match the ridge profiles can be interposed between the roof sheet and the clips to avoid scratching or gouging of the sheet during expansion and contraction movement.

Claims

AMENDED CLAIMS

[(received by the International Bureau on 10 September 2001 (10.09.01); original claims 1-18 replaced by amended claims 1-18 (3 pages) ]

A roofing sheet and fixings, in which the roofing sheet has a box rib type profile of ridges and valleys extending over the length of the sheet but having at intermittent positions indented formations on one or both outer and/or inner surfaces of the ridges of the sheet, together with fixings which engage the formations on the inner surfaces of the sheet, from behind the sheet, without perforation of the sheet, to hold the sheet down on support structure, characterised in that the fixings comprise clips having a high elasticity and strength, having double "S" shapes with free ends {59;72;87} which can move elastically downwards and inwardly {60,61} when the sheet is pressed down onto the clip and then outwardly so that the clip ends engage the formations, but if the sheet tends to lift, the ends {59;72;87} tend to move outwardly {60} to engage s the formations of the sheet more securely.

A roofing sheet and fixings as claimed in claim 1, characterised in that the clip has two additional limbs {73} which are pressed out of the double "S" shapes and steady the sheet transversely and provide a reaction force against the force exerted by the ends.

A roofing sheet and fixings, in which the roofing sheet has a box rib type profile of ridges and valleys extending over the length of the sheet but having at intermittent positions indented formations on one or both outer and/or inner surfaces of the ridges of the sheet, together with fixings which engage the formations on the inner surfaces of the sheet, from behind the sheet, without perforation of the sheet, to hold the sheet down on support structure, characterised in that the fixings comprise clips having a high elasticity and strength, the clip including an upper bulbous part {26} and two protruding parts {22}, which inter-engage with the formations in the sheet, the upper bulbous part providing a suitable elasticity coefficient for the action of the clip

19 which allows the sheet to be pressed down onto the clip when fixing the roof but holds the sheet down in use.

5. A roofing sheet and fixings as claimed in any one of claims 1 to 3, characterised in that the fixings further include elongated base strips {23;55;90}, each strip carrying several clips, the base strips extending in use transversely to the lengths of the sheets and locating the clips transversely accurately.

6. A roofing sheet and fixings as claimed in claim 5, characterised in that the strips are adapted so that they can be connected during erection and remain connected to each other during use so as to extend unbroken over the width (transverse to the lengths of the sheets) of the roof.

8. A roofing sheet and fixings as herein described and as illustrated in figures 3 to 5 of the drawings.

9. A roofing sheet and fixings as herein described and as illustrated in figures 6 and 7 of the drawings.

10. A roofing sheet and fixings as herein described and as illustrated in figures 10 and 11 of the drawings.

11. A roofing sheet and fixings as herein described and as illustrated in figures 13 and 14 of the drawings.

12. A roofing sheet and fixings as herein described and as illustrated in figures 15 and 16 of the drawings.

13. A roofing sheet and fixings as herein described and as illustrated in figures 17 and 18 of the drawings.

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14. A roofing sheet and fixings as herein -described and as illustrated in figure 19 of the drawings.

15. A method of fixing roof sheets as claimed in any one of claims 1 to 14, characterised by the sequence of steps of first laying and securing fixings to purlins or other roof structural supports, then laying and pressing down onto the fixings the roof sheets of the invention so that the indented formations of the sheets engage with free ends or protrusions of the fixings, which yield elastically to inter-engage with the formations and then hold the sheet down.

16. A method as claimed in claim 15, characterised by including a preliminary step of forming in a factory or otherwise riot on the roof, in box type roof sheets indentations at predetermined intermittent positions along the sheet lengths, the positions coinciding with positions at which fixings will be secured on the roof structural supports.

17. A method as claimed in claim 16, characterised by producing the indentations on site by using a hand tool which actuates a male die and female die, the one below the sheet and the other above, the tool having long enough handles to give sufficient leverage to be able to apply the required forces.

18. A method as herein generally described.

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