GB2287044A

GB2287044A - Sliding bracket and roof structure comprising such a sliding bracket

Info

Publication number: GB2287044A
Application number: GB9403760A
Authority: GB
Inventors: Bjarne Svanberg
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-26
Filing date: 1994-02-26
Publication date: 1995-09-06
Also published as: GB9403760D0

Abstract

A sliding bracket (6) for a roof structure comprising metal sheet roofing (4) on top of a compressible heat insulation layer (3) consisting of mineral fibre plates, has a foot plate (61) with teeth which prevent the bracket foot plate (61) from sliding relative to the heat insulation layer in the sliding direction of the slidable part (62) of the bracket (6), to accomodate the heat expansion of the covering (4) relative to the insulation layer (3). Moreover, the foot plate (61) has a tongue (64) which has a hole (65), for a fastener (7), spaced from the folding edge of the tongue (64) so that fastener (7) folds down the tongue (64), whereby the head of the fastener (7) will be located at a safe distance below the sheeting (4). <IMAGE>

Description

Sliding bracket and roof structure comprising such a sliding bracket.

The invention refers to a roof structure of the kind defined in the preamble of claim 1. The invention also refers to a sliding bracket of the kind defined in the preamble of claim 6.

A roof structure of the kind defined in the preamble of claim 1 is previously known from the practice.

An example of a sliding bracket of interest is revealed in EP-B-O 367 742.

The inventive bracket has many features in common with the bracket revealed in EP-B-O 367 742, to which reference is had, as to the structure and function of a sliding bracket4 From the practice, it has now turned out, that several serious inconveniences have occurred at roof structures of the above kind, for example that the fastener screw has a tendency to unscrew, that the top surface of the heat insulation layer is torn at the sliding bracket, that the fastener screw forms a large hole thru the heat insulation layer, that corrosion attacks occur were the fastener screw joins to the supporting substructure in the form of metal sheet, that the fastener screw has a tendency to fail at the attachment to the substructure, and that the fastener penetrates the exterior sheet metal roofing.

An object of the invention is therefore to provide a roof structure and a sliding bracket for producing such a structure, by means oE which at least one of the abovc in conveniences are partially or completely avoided.

This object is attained by the roof structure defind in the appended claim 1, and the sliding bracket defined in claim 6. Embodiments of the invention are defined in the dependent claims 2-5 and 7 By providing the foot of the bracket with friction means, for example teeth, which engage the heat insulation layer so that the foot of the bracket is prevented from displacement along the surface of the insulation layer, the sliding part of the bracket can now really slide along the foot part of the bracket. This means that the bracket foot will not rock and tear the top surfaces of the heat insulatic It also means that the fastener will not swing. And as the fastener does not swing, the diffusion seal sheet between the heat insulation and the supporting substructure will maintain its integrity whereby corrosion attacks are minimized.In a preferred embodiment, the foot plate of the brackethasatongue which has been punched out in the base plate of the foot and can be folded down out of the plar of the foot plate. This tongue has a hole for receiving the fastener. There is significant distance between said hole and the folding line of the tongue. When the fastener is driven down thru the hole in the tongue and anchored in substructure,the tongue will fold down whereby the head of the fastener will be located well below the top surface of the heat insulation layer. Even if a relatively forceful load from wind or from the foot of an operator is directed onto the bracket, the fastener head will not come up above the foot plate of the bracket.

Preferably, the sliding part of the bracket has a punched out tongue and the root of this tongue is preferably located near the root of the tongue in the foot plate, so that the tongue of the sliding part can be folded down on top of the tongue in the foot plate, if it is desired to transform the sliding bracket into a fixed bracket.

The foot plate of the bracket has downwardly directed teeth which can be forced down in the insulation layer, fpr example thereby that an operator sets down the bracket with this foot. The teeth are preferably formed by tabs which have been formed by punching in the sheet material of the foot plate. The plane of the teeth is suitably arranged transverse to the sliding direction of the bracket so that the teeth can resist a displacement of the foot plate of the bracket in the heat expansion direction of the sheet metal roofing. The minimum length of the foot plate is defind by the length of the sliding part of the bracket, and the required freedom of movement therefor. The width of the foot plate is preferably of the same order as the length of the foot plate. In a preferred embodiment, the foot plate area is about 7 x 7 cm.Preferably the foot plate area is at least 25 cm.

The invention will now be described in the form of an exampl with reference to the appended drawing.

Fig. 1 shows schematically a cross section of a roof structure with a bracket of the inventive kind.

Fig. 2 shows schematically a horisontal view of the bracket useri in the structure of fig. 1.

Fig. 3 shows schematically an end view of the bracket.

The supporting substructure 1 for example a trapeze corrogat metal sheet which in turn is supported by beams, carries a diffusion proof foil 2 and a layer 3 of heat insulation material. The layer 3 is usually formed by a conventional mineral wool plate, which has a compression resistance which which is suitable for the loads which normally occur on roof structures. The heat insulation plates used in the example is the product "takskita 3675/50" produced by Gull fiber, Sweden.

Roofing metal sheets 4 of the bandtype are laid on top of the heat insulation layer 3 so that the length direction of the sheets 4 is perpendicular to the plane of fig. 1.

The edges of the sheets 4 are formed in a conventional manner in order to be connected by folding. A sliding bracket 6 has a sliding portion 62 which is folded into the joining fold of the sheets 4. The foot portion 61 of the bracket is anchored to the substructure l by means of a long screw 7 which preferably is self-drilling and selftapping.

The foot plate portion 62 of the bracket 6 has significantly increased surface area in order to stay at rest on the top of the insulation layer 3. The plurality of downwardly extending teeth 63 have been punched down out of the sheet material of the foot plate 61, and the plane of the teeth 63 is perpendicular to the sliding direction of the top part 62 of the bracket, that is the heat expansion direction of the band roofing plates 4.

In the foot plate 62 there is also a tongue 64 which has been punched out, and has a folding line near the edge of the plate 61 where the slidable part 62 is attached.

The tongue 64 has a hole 65 at a significant distance from the folding line of the tongue. Initially, the tongue 64 is normally located in the plane of the foot plate 61, but when the screw 7 is anchored, this screw 7 will fold down the tongue 64, as shown in fig. 1, whereby the head of the screw 7 will be located at significant distance below the top surface of the foot plate 61. Tf a downwardly directed force is exerted on the roofing plate 4 near the bracket 6, -the insulation layer 3 can take up this load by compression without the risk that the screw head penetrates the roofing sheet 4.

As can be seen in Fig. 3, the foot 61 bf the bracket 6 has a guide 69 which guides the portion 62 for sliding movement. The sliding portion 62 has central punched out tongue 25 with a central hole 26. The tongue 25 is normally vertical, and can be folded down along the bottom line whic lies near the foot plate 61 of the bracket. When the slidin part 62 is in a central position, the folding line of tongu 25 lies adjacent to the folding line of the tongue 64.

Therefore, if it is desired to transform the bracket 6 into fixed bracket, the tongue 25 can simply be folded down on top of the tongue 64 whereafter the screw 7 is passed thru the aligned holes and anchored in the substructure 1.

From Fig. 2 it can be seen that the teeth 63 have been punched in the form of triangle elements, which easily penetrate the heat insulation and together form a sufficien resistance against displacement of the foot plate, despite the relatively small penetration depth.

In the preferred embodiment, the length of the teeth is about 15 mm and the root width is about 6 mm.

In the inventive roof structure, the heat insulation layer is used to hold the bracket foot stationary whereby bending of the fastener screw is avoided when the covering 4 moves due to temperature changes.

Claims

1. Roof structure comprising a supporting extended substructure, a heat insulation layer which is laid on the substructure, a roofing metal sheet covering laid on the heat insulation layer, said covering exhibiting heat expansion movements relative to the heat insulation layer in a defined direction, and a sliding bracket having a foot which stands on the heat insulation layer and which is joined to the Substructure by means of a fastener which extends thru the heat insulation layer, said sliding bracket having. also a slidable top portion which is joined to the metal sheet covering, characterized in that the foot is provided with anchorage means which anchors the foot in te heat insulation layer , against movement in said direction.

2. Roof structure according to claim 1, characterized in that the anchored means comprises teeth which are punched out of the metal sheet material of the foot, to have the plane of the teeth transverse to the sliding direction of the bracket , said heat insulation layer preferably comprising mineral fibre roof plates.

3. Roof structure according to claim 1 or 2, characterized in that the slidable top portion has a punched out tongue which is foldable along a line adjacent to and parallell with the top surface of the foot

4. Roof structure according to any of claims 1-3, characterized in that the foot plate has a punched out tongue which is foldably connected along a folding line near the edge of the foot plate where the slidable bracket part is located, said tongue having a hole for the fastener, at a significant distance from the folding line of the tongue.

5. Roof structure according to any of claims 1-4, characterized in that the foot plate of the bracket has a width which is at least half the length of the bracket, said foot plate covering an area of at least 25 cm2 of the heat insulation layer and preferably covering about 50 Cm2.

6. Sliding bracket for a roof structure comprising a metal sheet roof covering which is laid on a heat insulation layer on an extended carrying roof substructure , said bracket having a foot plate which lies flatly on the heat insulation layer a slidable top portion which is joined to the covering , said foot plate having a hole for a fastener to connect the bracket to the substructure, characterized in that the foot plate has anchorage means which anchor the foot plate in the insulation layer against movement relative to the insulation layer in the sliding direction of the top portion.

7. Bracket according to claim 6, characterized in that F teeth are punched out of the metal sheet material of the foot plate, the plane of the teeth extending in a plane which is perpendicular to the sliding direction of the slidable portion.

8. Bracket according to claim 6 or 7, characterized in that a tongue is punched out of the sheet material of the foot plate, said tongue having a hole for the fastener, said tongue being foldably connected to the plate near the edge thereof where the slidable part is connected, said slidable bracket part preferably also comprising a tongue which is foldable adjacent to the folding line of the tongue (64) on the base plate so that the fastener can be passed thru a hole in the tongue of the slidable portion the hole of the base plate tongue being located at a significant distance from the folding line thereof.

9. Bracket according to any of claims 6-8, characterized in that the foot plate of the bracket 2 covers an area of at least 25 cm

10. Bracket according to any of claims 7-9, characterized in that the teeth are of triangular shape and are arranged in rows, wherein the folding lines of adjacent teeth are generally parallel but separated a distance corresponding to the tooth height, andwherein the center-to-center distance between adjacent teeth of a row is less than length of the tooth folding line.

11. Roof structure substantially as described herein with reference to the accompanying drawings.

12. A sliding bracket substantially as described herein with reference to the accompanying drawings.