Corner bracket, a bracket system, use of such a corner bracket, a window mounting collar and a window mounting system

Abstract

A corner bracket for assembly of two boards of a window mounting collar into a collar corner and for affixing said window mounting collar to an exterior face of a building faade so as to surround a window opening, said corner bracket; comprising two holding plates and two base arms, all four adapted for extending in planes parallel with and having back surfaces abutting the exterior face of the building faade in an affixed position of the collar. The bracket further comprises two flanges and two abutment plates adapted to extend away from said exterior face in an affixed position of the collar. Each abutment plate is positioned at a mutual distance from and in parallel with an associated said flange, each abutment plate being connected to the associated said flange via an associated said holding plate; so as to be able to hold said boards together to form said window collar corner, each board being received between a respective flange and its associated abutment plate.

Claims

1. A corner bracket for assembly of two boards of a window mounting collar into a collar corner and for affixing said window mounting collar to an exterior face of a building faade so as to surround a window opening, said corner bracket comprising; two holding plates and two base arms adapted for extending in planes parallel with and having back surfaces abutting the exterior face of the building faade in an affixed position of the collar, the two base arms each being adapted for receiving a fixation member for insertion therethrough and into the building faade such as to fixate the collar to the faade; a flange arm comprising two flanges adapted to extend away from said exterior face in the affixed position of the collar, each flange having a proximal end configured to be proximal and a distal end configured to be distal to the exterior face in the affixed position of the collar, each flange further having an attaching edge extending from the proximal end to the distal end, the attaching edges of the flanges being attached to each other along at least a part of the attaching edges, the flanges extending with an angle between them such as to form a flange corner at said attaching edges, the flange corner being adapted to be positioned in an inner corner formed between the two boards in the affixed position of the collar; two abutment plates adapted to extend away from said exterior face in the affixed position of the collar, each abutment plate having a proximal end configured to be proximal and a distal end configured to be distal to the exterior face in the affixed position of the collar, each abutment plate being adapted to abut a respective outer surface of the two boards in the affixed position of the collar; and each abutment plate being positioned at a mutual distance from and in parallel with an associated said flange, each abutment plate being connected to the associated said flange via an associated said holding plate; so as to be able to hold said boards together to form said window collar corner, each board being received between a respective flange and its associated abutment plate.

2. The corner bracket according to claim 1, wherein said two abutment plates are positioned at a distance from each other.

3. The corner bracket according to claim 2, wherein each abutment plate does not extend beyond a plane in which its non-associated flange extends.

4. A window mounting collar comprising at least one inside face, at least one outside face, a first open end and a second open end and the corner bracket according to claim 2.

5. A window mounting collar according to claim 4, wherein at least one of the boards comprises or is manufactured from man-made vitreous fibre material.

6. A window mounting system comprising a building faade having an interior face and an exterior face and comprising a window opening; and a window mounting collar according to claim 4, wherein the window mounting collar is affixed to the exterior face of the building faade by the at least one of the base arms of the corner system so as to surround the window opening and extend outwards from the exterior face of the faade, such that the first end of the mounting collar is proximal to the building faade and the second end of the mounting collar is distal from the building faade.

7. The window mounting system according to claim 6, further comprising external wall insulation affixed to the exterior face of the building faade so as to surround the window mounting collar.

8. The window mounting collar according to claim 4 comprising two side boards, an upper cross board and a lower cross board, each having an inside face and an outside face, wherein at least one of the two side boards is joined orthogonally to the upper and lower cross boards by means of the corner bracket.

9. The corner bracket according to claim 1, wherein the corner bracket is obtainable by a process of punching one single work-piece out from a single sheet of plate metal and folding or bending the work-piece into shape.

10. The corner bracket according to claim 1, wherein said two flanges extend in respective planes forming a mutual angle of 60-120, and/or said two abutment plates extend in respective planes forming a mutual angle of 60-120, and/or each associated abutment plate and flange extend in parallel planes.

11. The corner bracket according to claim 10, wherein said two flanges extend in respective planes forming a mutual angle of 80-100, and/or said two abutment plates extend in respective planes forming a mutual angle of 80-100.

12. The corner bracket according to claim 1, wherein each associated holding plate and flange extend in respective planes forming a mutual angle between approximately 60-120, and/or each associated holding plate and abutment plate extend in respective planes forming a mutual angle between approximately 60-120.

13. The corner bracket according to claim 1, wherein each of said base arms are formed as an extension of the associated said holding plate, each base arm extending away from a plane of the associated said abutment plate so that the associated fixation member can be inserted through the base arm when the two boards are positioned to be held between the respective flanges and abutment plates, and/or at least one of said base arms comprises a receiving aperture for receiving the fixation member therethrough.

14. The corner bracket according to claim 1, wherein each of said base arms is obtainable by punching it out from an associated one of said abutment plates and folding it into position.

15. The corner bracket according to claim 1, wherein at least one of each associated abutment plate and flange comprises at least one retention aperture positioned for receiving a retention member, such as a screw or a bolt, inserted through the associated abutment plate, through the board to be positioned between the associated abutment plate and flange, and through the associated flange so as to press the board in between the associated abutment plate and flange to retain the board, the abutment plate and flange being pulled against each other by means of the retention member.

16. A corner system comprising the bracket according to claim 1, further comprising two boards of a window mounting collar assembled to form a collar corner by means of the corner bracket, said two boards being held together by the corner bracket to form said collar corner, each board being received between a respective flange and its associated abutment plate, wherein each board has an outer board surface, which is adapted to be parallel with and to face away from the exterior face of the faade in the affixed position of the collar, each flange and associated abutment plate being in contact with an associated one of said two boards, the distal end of each flange and/or of each abutment plate being positioned at a distance from the outer board surface of its associated board, said distal end of said flange or abutment plate being positioned at a distance from the outer board surface of its associated board of 10% to 150% of a length of the respective flange or abutment plate.

17. A bracket set comprising the corner bracket according to claim 1, further comprising a holding bracket shaped like the corner bracket, but with the difference that it comprises only one single associated abutment plate and flange, one associated holding plate and one associated base arm so that the holding bracket can be manufactured by cutting along the attaching edges of the corner bracket to separate the two flanges, the holding bracket thus being adapted to hold a collar board to the faade, and/or a joining bracket shaped like the corner bracket, but with the difference that an angle between planes in which said flanges extend is approximately 180, said abutment plates further extending in a mutual plane, so that the joining bracket can be used to join two collar boards extending in a mutual longitudinal direction, each collar board being received between a respective flange and its associated abutment plate of said joining bracket.

18. A window mounting collar corner comprising the corner bracket according to claim 1 for holding together two boards of a window mounting collar, each board being received between a respective flange and its associated abutment plate and attached by means of a retention member inserted through the respective flange, the respective board and the abutment plate associated with said respective flange, and further for affixing said window mounting collar to an exterior face of a building faade so as to surround a window opening, the two base arms each receiving a fixation member for insertion therethrough and into the building faade such as to fixate the window mounting collar to the faade.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is described further below with reference to the Figures, where FIGS. 1 to 4b are not according to the invention.

(2) FIG. 1 shows a first window mounting collar.

(3) FIG. 2 shows a first window mounting system.

(4) FIG. 3 shows a section through the system of FIG. 1, viewed from above.

(5) FIGS. 4a and 4b show a bracket system from two angles.

(6) FIG. 5 shows a second window mounting collar, which is according to the fourth aspect of the present invention.

(7) FIG. 6a shows a perspective view of an embodiment of the corner bracket according to the first aspect of the invention.

(8) FIG. 6b shows a first side view of the corner bracket shown in FIG. 6a.

(9) FIG. 6c shows a second side view of the corner bracket shown in FIG. 6a.

(10) FIG. 7 shows a top view of a work-piece punched out from one single sheet of plate metal, the work-piece being adapted to be folded or bent into the corner bracket of FIG. 6a.

(11) FIG. 8 shows a perspective view of a holding bracket according to the bracket set of the second aspect of the invention.

(12) FIG. 9 shows a perspective view of a joining bracket according to the bracket set of the second aspect of the invention.

(13) FIG. 10 shows a means by which a window frame can be arranged in a window mounting collar.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(14) In FIG. 1, a window mounting collar 1 is shown before installation on a building faade. The mounting collar 1 comprises two side boards 2, an upper cross board 3 and a lower cross board 4, each having an inside face 2a, 3a, 4a and an outside face 2b, 3b, 4b, wherein each side board 2 is joined orthogonally to the upper and lower cross boards 3, 4. The mounting collar has a first open end 5, which, when installed, faces the exterior face of the building faade. The second open end 6 of the mounting collar 1 receives a window frame, which can be installed either before the mounting collar is affixed to the building faade or after the mounting collar has been affixed to the building faade.

(15) In the embodiment shown, the two side boards 2, the upper cross board 3 and the lower cross board 4 are each formed from three layers of man-made vitreous fibre boards, each layer comprising man-made vitreous fibres and binder.

(16) Preferably, each board has a bending strength of at least 7 N/m2 and a point load resistance of at least 500 kN.

(17) The board preferably has a thermal conductivity, measured in a direction from the first end to the second of the collar, of below 0.150 W/m.Math.K, preferably below 0.100 W/m.Math.K. The thermal conductivity of the board, measured in a direction from its inside face to its outside face, is preferably below 0.150 W/m.Math.K, more preferably below 0.100 W/m.Math.K. The thermal conductivity of the board, measured in a direction from its inside face to its outside face, is often lower than the thermal conductivity, measured in a direction from the first end to the second of the collar. Most preferably, the thermal conductivity of the board, measured in a direction from its inside face to its outside face, is below 0.075 W/m.Math.K.

(18) In one embodiment, the board comprises man-made vitreous fibres and binder and has a density of at least 150 kg/m3. Such compressed man-made vitreous fibre boards generally have sufficient rigidity and strength to support window frames without the use of additional brackets attaching the window frame to the building faade directly. It is preferred that the material has a density of at least 200 or at least 300 kg/m3. Usually, the density is less than 600 kg/m3, preferably less than 500 kg/m3.

(19) Particularly suitable man-made vitreous fibre boards are produced according to the method described in WO2011/012712. Preferably, the boards comprise from 1% to 20% binder and from 80 to 99% man-made vitreous fibres.

(20) Compressed man-made vitreous fibre boards have the additional benefit that they are fire-proof. In a preferred embodiment, the man-made vitreous fibre boards are layered to form the sides of the mounting collar. Where at least two man-made vitreous fibre boards are layered at their large surfaces, the bending strength of the mounting frame can be improved, thereby improving the stability of the system.

(21) Alternatively, the mounting collar can be formed from polymeric foam, for example polyurethane foam.

(22) In a further embodiment, the mounting collar is formed from a polymeric foam composite material comprising a polymeric foam and man-made vitreous fibres, wherein at least 50% by weight of the man-made vitreous fibres present in the polymeric foam composite material have a length less than 100 micrometers. Such a polymeric foam composite is discussed in our co-pending application PCT/EP2012/066196.

(23) Attached to the mounting collar 1, on its outside faces 2b, 3b, 4b, are brackets 7. In the embodiment shown, the brackets 7 are L-shaped brackets, which are positioned on the outside faces of the mounting collar adjacent to its first open end 5.

(24) FIG. 2 shows the mounting collar 1 in place on a building faade 8, as part of a complete window mounting system. Brackets 7 affix the mounting collar 1 to the exterior face of the building faade 8. A window frame 9 is mounted in the mounting collar such that there is a separation d shown in FIG. 3 of at least 10 mm between the window frame 9 and the plane of the exterior face of the building faade 8. The window frame 9 surrounds a window sash 10 and window panes 11. External wall insulation 12 not shown on one side of the mounting collar is positioned around the outside of the mounting collar 1 and affixed to the building faade 8. The external wall insulation 12 has the same depth as the mounting collar 1, so the window frame 9 is arranged to be flush with the outer surface of the external wall insulation 12.

(25) FIG. 3 shows a section through the system of FIG. 2, viewed from above. The side boards 2 of the mounting collar 1 are affixed to the exterior face 13 of the building faade 8. The side boards 2 extend perpendicularly outwards from the building faade 8. L-shaped brackets 7 have two perpendicular arms, one of which is attached to an outside face 2b of the mounting collar 1, the other of which is attached to the exterior face 13 of the building faade 8. The separation d between the window frame 9 and the plane of the exterior face 13 of the faade allows the mounting collar 1 to be fitted when an existing window is still present in the window opening 14. External wall insulation 12 is present on either side of the mounting frame 1. The mounting collar 1 extends away from the building faade 8 by the same distance as the depth of the external wall insulation 12. Means for attaching the window frame 9 to the mounting collar 1 are not shown, but could, for example, be screws passing through the window frame 9 and into the mounting collar 1.

(26) FIGS. 4a and 4b show a corner system that may be used with the window mounting collar 1 according to FIG. 1 and comprising two boards 1a and 1b of the window mounting collar 1 assembled to form a collar corner by means of a corner bracket denoted 0. The window mounting collar could be in the form of that shown in FIG. 1. The corner bracket 0 comprises a bracket part 15 with two base arms 16 in the form of plates and flange arm 17, which comprises two abutment plates 17a, 17b that are substantially perpendicular to each other and are joined at one edge. The two abutment plates 17a, 17b extend away from the exterior face of the facade 8 in the affixed position of the collar 1. Each abutment plate 17a, 17b has an end proximal and an end distal to the exterior face of the facade 8 in the affixed position of the collar 1. Each abutment plate 17a, 17b abuts a respective outer surface of the two boards 1a, 1b. In the embodiment of FIGS. 4a and 4b the two abutment plates 17a, 17b are attached to each other along a mutual attachment edge.

(27) The two base arms 16 extend in planes parallel with the exterior face of the building faade in the affixed position of the collar 1. The two base arms 16 further have back surfaces for abutting the exterior face and are each provided with five fixation member holes or receiving apertures 18 for receiving fixation members (not shown), such as screws, therethrough and into the building faade such as to fixate the collar 1 to the faade. The second arm 17 of the bracket part 15 extends away from the exterior face of the building faade 8 along two of the outside faces 2b, 3b of the boards 1a, 1b, respectively, of the mounting collar 1.

(28) Holding part 19 has an attachment arm 20 and two holding plates 21a, 21b formed as two connected parts of one single plate positioned at an outer surface of the two boards 1a, 1b. The holding plates 21a, 21b extend in planes parallel with and are positioned at a distance from the exterior face of the building faade 8 in the affixed position of the collar 1. The attachment arm 20 is in the form of two substantially orthogonal plates 20a, 20b, attached to each other at one edge, and each attached to the holding plate 21 at one end. The holding plate 21 is L-shaped to match the shape of the corner of the mounting collar 1 and has two flanges 22 that are perpendicular to each other and perpendicular to the holding plate 21. The flanges 22 extend away from the exterior face of the facade 8 in the affixed position of the collar 1 to be attached to respective edges of the holding plates 21a, 21b positioned opposite to the edges attached to the plates 20a, 20b of the attachment arm 20. The flanges 22 lie against two adjoining inside faces 2a, 3a of the respective boards 1a, 1b of the mounting collar 1. Each flange 22 has an end proximal to and an end distal to the exterior face of the facade 8 in the affixed position of the collar 1. The flanges 22 extend at a mutual angle of about 90 such as to fit snugly into an inner corner formed between the two boards 1a, 1b.

(29) Each abutment plate 17a, 17b is positioned at a mutual distance from and in parallel with an associated of the two flanges 22. This distance is established as corresponding to the thickness of the boards 1a, 1b since the associated flange 22 and abutment plate 17a, 17b are positioned on each side of the respective board 1a, 1b. Each abutment plate 17a, 17b is connected to the associated of the flanges 22 via an associated of the holding plates 21b, 21a, respectively. Each abutment plate 17a, 17b extends in this embodiment beyond a plane in which its non-associated flange 22 extends; for example, the abutment plate 17a extends farther in the left direction of FIG. 4a than to the plane in which the lowermost flange (which abuts the holding plate 21a) extends. The plane, in which the lowermost flange (which abuts the holding plate 21a) extends, extends along the inside face 2a of board 1a. Each associated abutment plate 17a, 17b and flange 22 extend in parallel planes. Each of the base arms 16 are positioned at a distance from the associated holding plate 17a, 17b.

(30) Hereby, the two boards 1a, 1b are held together by the corner bracket 0 to form the window collar corner, each board 1a, 1b being received between a flange 21a, 21b and its associated abutment plate 17b, 17a, respectively.

(31) Since the holding plates 21a, 21b are attached along outer edges to the plates 20a, 20b, respectively, the corner bracket is in this embodiment not directly obtainable by a process of punching one single work-piece out from a single sheet of plate metal and folding or bending the work-piece into shape.

(32) In the corner bracket shown in FIGS. 4a and 4b the two flanges 22 extend in respective planes forming an angle between them of approximately 90, and the two abutment plates 17a, 17b extend in respective planes forming a mutual angle of 90. Each associated holding plate 21a, 21b and flange 22 extend in respective planes forming an angle of approximately 90, and each associated holding plate 21a, 21b and abutment plate 17b, 17a, respectively, extend in respective planes forming an angle of approximately 90.

(33) The abutment plates 17a, 17b each comprises a slit extending along the respective abutment plates 17a, 17b for receiving screws inserted into the respective boards 1a, 1b. To this end the boards 1a, 1b may be manufactured from wood.

(34) FIG. 5 shows a window mounting collar, for the sake of convenience also denoted 1, according to the fourth aspect of the present invention and mounted in place on an exterior face of a building faade 8, the collar 1 forming part of a complete window mounting system surrounding a window opening 14. Four corner brackets 100, each according to the first aspect of the invention, one holding bracket 200 and one joining bracket 300 affix the mounting collar 1 to the exterior face of the building faade 8.

(35) Features of the corner bracket 100, holding bracket 200 and joining bracket 300, which are similar or like in function to the associated features of the bracket 0 in FIGS. 4a and 4b, are referred to herein with reference numbers with 100, 200 and 300 added, respectively.

(36) The brackets 100, 200, 300 specifically retain four boards 1a, 1b, 1c, 1d of the collar 1 between respective abutment plates 117a, 117b, 217, 317a, 317b and associated flanges 122a, 122b, 222, 322a, 322b, respectively, of the brackets 100, 200, 300 as shown in FIGS. 6-9. Note that a further, similar joining bracket (not shown) may be positioned oppositely on the board 1c, and a further, similar holding bracket or joining bracket may be positioned oppositely on the board 1d. Generally, the number of corner brackets, holding brackets and joining brackets may vary depending on window size, number of boards, collar dimensions etc.

(37) In FIG. 5 the base arms 116a, 116b, 216, 316a, 316b of the corner brackets 100, holding bracket 200 and joining bracket 300 are visible on an outside of the upper 1b and the left 1a board of the collar 1. The base arms 116a, 116b, 216, 316a, 316b lie parallel with and abut the building faade 8. Similarly the abutment plates 117a, 117b, 217, 317a, 317b of the corner brackets 100, holding bracket 200 and joining bracket 300 are visible on an outside of the upper 1b and the left 1a board of the collar 1. The abutment plates 117a, 117b, 217, 317a, 317b lie parallel with and abut an associated board 1a, 1b, 1c, 1d of the window mounting collar 1.

(38) In FIG. 5 an inside of a flange arm 180 of a corner bracket 100 is visible at the inside bottom right corner of the collar 1. The flange arm 180 comprises two flanges 122a, 122b.

(39) Similar to the embodiment of the window mounting system as shown in FIG. 2, external wall insulation (not shown in FIG. 5) may be positioned around the outside of the mounting collar 1 and affixed to the building faade 8. The external wall insulation may have the same depth as the mounting collar 1, e.g. 300 mm, so that a window frame may be arranged to approximately be flush with an outer surface of the external wall insulation.

(40) FIGS. 6a, 6b and 6c show one of the corner brackets 100 for assembly of two respective boards 1a, 1b; 1b, 1c; 1c, 1d; 1d, 1a of the window mounting collar 1 of FIG. 5 into a collar corner and for affixing the window mounting collar 1 to the exterior face of the building faade 8 so as to surround the window opening. The corner bracket 100 is symmetrical so as to be divided into a first bracket part 100a and a second bracket part 100b, which is formed similar to the first bracket part 100a, but symmetrically over a symmetry plane. The bracket part 100a comprises one holding plate 121a, one associated base arm 116a, one associated abutment plate 117a and one associated flange 122a. The bracket part 100b similarly comprises one holding plate 121b one associated base arm 116b, one associated abutment plate 117b and one associated flange 122b.

(41) Generally, in the context of the present specification it is noted that the term associated when used in relation to the abutment plate, flange, holding plate and base arm of the corner bracket should be understood as forming part of the same of the two bracket parts. The associated board is equivalently the board positioned between a abutment plate and associated flange of a corner bracket.

(42) Each holding plate 121a, 121b and its associated base arm 116a, 116b, respectively, extend in planes parallel with and having back surfaces abutting the exterior face of the building facade 8.

(43) The base arms 116a, 116b are formed as respective extensions of their associated holding plate 121a; 121b, extending away from a plane of the associated said holding plate 121a; 121b. Each holding plate 121a, 121b is at one edge attached to the associated base arm 116a, 116b. The base arms 116a, 116b have a width (defined as the direction extending along a longitudinal direction of the associated board) somewhat smaller than the width of the holding plates 121a, 121b, and extend away from the holding plate 121a, 121b. The base arms 116a, 116b further each comprise one elongated, approximately elliptical receiving aperture 118a, 118b positioned approximately at the centre of the respective base arm 116a, 116b in the width direction, and extending in the same direction as the respective base arm 116a, 116b. The receiving apertures 118a, 118b receives a fixation member in the form of a screw or bolt therethrough and into the building faade 8, such as to fixate the collar 1 to the faade 8 when the board is positioned to be held between the associated flange 122a; 122b and abutment plate 117a; 117b.

(44) Each abutment plate 117a, 117b extends approximately perpendicularly away from its associated holding plate 121a, 121b and base arm 116a, 116b. Each abutment plate 117a, 117b comprise a proximal end 147a, 147b configured to be proximal and a distal end 157a, 157b configured to be distal to the exterior face of the faade 8 in the affixed position of the collar 1. Each abutment plate 117a, 117b is connected at its proximal end 147a, 147b, respectively, to the associated holding plate 121a, 121b and associated base arm 116a, 116b at a line dividing the associated holding plate 121a, 121b and the associated base arm 116a, 116b. Each abutment plate 117a, 117b is adapted to abut a respective outer surface of the associated board 1a, 1b, 1c, 1d in the affixed position of the collar 1.

(45) In the embodiment of FIG. 6a to 6c each abutment plate 117a, 117b does not extend beyond a plane in which its non-associated flange 122b, 122a, respectively, extends. The abutment plate 117a with which the flange 122b is not associated is referred to as the non-associated abutment plate thereof. Similarly, the abutment plate 117b with which the flange 122a is not associated is denoted the non-associated abutment plate thereof.

(46) Each abutment plate 117a, 117b further comprises two retention apertures 130a, 130b positioned for receiving an oblong retention member (not shown) in the form of a screw or a bolt inserted through the associated abutment plate 117a, 117b, through the board 1a, 1b, 1c, 1d to be positioned between the associated abutment plate 117a, 117b and flange 122a, 122b, and through the associated flange 122a, 122b. Hereby, the board may be pressed in between the associated abutment plate 117a, 117b and flange 122a, 122b to retain the board, the abutment plate 117a, 117b and flange 122a, 122b being pulled against each other by means of the retention member. The abutment plate 117a, 117b additionally comprises a cut-out 140a, 140b extending from its proximal end towards its distal end, which provides for the base arm 116a, 116b to be folded into position, see further below regarding manufacture of the brackets according to the invention.

(47) Each flange 122a, 122b extends approximately perpendicularly away from its associated holding plate 121a, 121b, and is positioned at a mutual distance from and in parallel with its associated abutment plate 117a, 117b. Each flange 122a, 122b has a proximal end 142a, 142b configured to be proximal, and a distal end 152a, 152b configured to be distal to the associated holding plate 121a, 121b. The flange 122a, 122b is attached at one edge at its proximal end to an edge of its associated holding plate 121a, 121b. The flange 122a, 122b is wider than its associated holding plate 121a, 121b.

(48) Finally, the bracket parts 100a, 100b are connected via flange arm 180 comprising the two flanges 122a and 122b. Each flange 122a, 122b has an attaching edge 123a, 123b, respectively, extending from the proximal end 142a, 142b to the distal end 152a, 152b. The attaching edges 123a, 123b are attached to each other along the entire part of the attaching edges 123a, 123b, but may in other embodiments extend only along part of the edges 123a, 123b. For example one or more discontinuations could be provided between the ends 142a, 152a; 152a, 152b, respectively, the ends being attached to each other, which can save bracket material. The flanges 122a, 122b extend approximately perpendicularly to each other, forming an inner flange corner supporting the inner faces of the associated two boards, for example 1a, 1b, in the affixed position of the boards.

(49) The symmetry plane dividing the corner bracket 100 into the two bracket parts 100a, 100b extends through the attaching edges 123a, 123b of the flanges 122a and 122b.

(50) In FIG. 5 associated pairs of the boards 1a, 1b, 1c, 1d are received between a respective flange 122a, 122b and an associated abutment plate 117a, 117b of each corner bracket 100. Each board 1a, 1b, 1c, 1d has an outer board surface, which is parallel with and faces away from the exterior face of the faade 8. Each flange 122a, 122b and associated abutment plate 117a, 117b are thus in contact with an associated one of the boards 1a, 1b, 1c, 1d, the distal end 152a, 152b, 157a, 157b of each flange 122a, 122b and/or of each abutment plate 117a, 117b being positioned at a distance from the outer board surface of its associated board 1a, 1b, 1c, 1d. The respective distal ends 152a, 152b, 157a, 157b of the flanges 122a, 122b and abutment plates 117a, 117b are positioned at a distance from the outer board surface of the associated board 1a, 1b, 1c, 1d of approximately 200 mm, i.e. about 50% of a length measured in the depth direction of the collar 1 of the respective flange 122a, 122b or abutment plate 117a, 177b.

(51) Note that according to the invention the bracket parts 100a and 100b need not necessarily be similar, and the holding plates 121a, 121b, base arms 116a, 116b, abutment plates 117a, 117b or flanges 122a, 122b may be of respective different shapes or sizes. For example the length of abutment plates 117a, 117b and flanges 122a, 122b, respectively, may be different from each other.

(52) FIG. 7 shows a top view of a work-piece W punched out from one single sheet of plate metal. The work-piece W is subsequently folded or bent into the corner bracket 100 of FIG. 6a. The folding lines are shown with dashed lines. All foldings are by approximately 90. Similarly, the holding bracket 200 of FIG. 8 and joining bracket 300 of FIG. 9 are manufactured by punching out from a single sheet of plate metal.

(53) FIG. 8 shows the holding bracket 200 shaped like the corner bracket 100 of FIGS. 5a, 5b and 5c, but with the difference that it comprises only one single associated abutment plate 217 and flange 222, one associated holding plate 221 and one associated base arm 216. The holding bracket 200 may be manufactured by cutting along the attaching edges 123a, 123b of the corner bracket 100 to separate the two flanges 122a, 122b. The holding bracket is thus adapted to hold a board 1a, 1b, 1c, 1d to the exterior face of the faade 8 anywhere along the boards.

(54) FIG. 9 shows a joining bracket 300 shaped like the corner bracket 100, but with the difference that an angle between planes in which the flanges 322a, 322b extend is approximately 180. Hereby, the abutment plates 317a, 317b and flanges 322a, 322b extend in a mutual plane, so that the joining bracket 300 may be used to join two board pieces of one collar board 1a, 1b, 1c, 1d extending in a mutual longitudinal direction. Each board 1a, 1b, 1c, 1d may thus be received between a respective flange 322a, 322b and its associated abutment plate 317a, 317b of said joining bracket 300, see further below. The joining bracket 300 can be manufactured by avoiding the folding along the attaching edges 123a, 123b of the corner bracket 100 as shown in FIG. 6a. The joining bracket 300 can also be used as a holding bracket, i.e. without joining two board pieces.

(55) The window frame is mounted in the mounting collar and can be fixed in place by conventional means. For example, screws could be inserted through the window frame and into the mounting collar. If the material of mounting collar allows the screws to be pulled out too easily, it may be necessary to arrange a plate at the outside face of the mounting collar. A screw can then be inserted through the window frame, through the mounting collar and through the plate to provide a firmer connection. However, if external wall insulation is already in place, then positioning of a plate at the outside face of the mounting collar can be difficult.

(56) Therefore, it has been found to be particularly advantageous to use a frame mounting clip to mount the window frame in the mounting collar. The frame mounting clip has a base plate and first and second side plates extending from opposite ends of the base plate, substantially perpendicular to the base plate and substantially parallel to each other. The clip can be arranged on the mounting collar at its second end such that the first side plate abuts an inside face of the mounting collar and the second side plate abuts an outside face of the mounting collar. In order to mount the window frame in place, a screw is inserted through the window frame, the first side plate of the mounting clip, through the window mounting collar and through the second side plate of the mounting clip.

(57) This clip allows for a stronger attachment of the window frame to the mounting collar and allows for easy positioning of the clip because the base plate of the mounting clip is always easily accessible, even when external wall insulation is in place surrounding the mounting collar.

(58) The clip can be made of any suitable material with sufficient rigidity and strength and that can accept screws. The clip could, for example, be made of metal. However, materials with a lower thermal conductivity are preferred. In one embodiment, the first and second side plates of the clip each comprise a pre-bored hole to accept a screw. FIG. 10 shows an example of a mounting clip system. The mounting clip 23 has a base plate 24 and first and second side plates 25, 26 extending from opposite ends of the base plate 24. The clip 23 is shown arranged on the mounting collar 1 at its second end 6 such that the first side plate 25 abuts an inside face 2a of the mounting collar 1 and the second side plate 26 abuts an outside face 2b of the mounting collar 1. The first side plate 25 of the window mounting clip 23 is shaped as a wedge, having a thickness at its end furthest from the base plate 24 that is greater than the thickness of the first side plate 25 of the window mounting clip 23 at its end that is adjoined to the base plate 24.

(59) When assembling the collar 1 of FIG. 5, first the boards 1a, 1b, 1c, 1d are cut (e.g. sawed) out from longer board members. If this results in surplus board pieces, examples of surplus board pieces shown as board pieces 1e and 1f in FIG. 5, of too short lengths, these may be further cut to appropriate sizes to be joined by means of one or more joining brackets 300 to form a resultant board, in the example of FIG. 5 board 1b, of suitable length. The boards may alternatively be manufactured from the factory in suitable lengths so as to avoid the sawing operation.

(60) Two respective of the boards 1a, 1b, 1c, 1d of the collar 1 are subsequently positioned between abutment plate 117a, 177b and associated flange 122a, 122b, respectively, of a first corner bracket 100 to be preliminary retained to the corner bracket 100 between the abutment plates 117a, 177b and the associated flanges 122a, 122b. The associated board 1a, 1b, 1c, 1d is then permanently retained by means of oblong retention members in the form of bolts (not shown) inserted through the retention apertures 130a, 130b of the abutment plates 117a, 117b, through the associated board 1a, 1b, 1c, 1d, and through further, associated retention apertures (not shown) of flanges 122a, 122b. Hereby, the two associated boards 1a, 1b, 1c, 1d are positioned in the bracket 100 as shown in FIG. 5, the boards 1a, 1b, 1c, 1d forming a collar corner of the collar 1. This procedure is subsequently performed with each corner bracket of the collar 1, thereby resulting in a finished collar 1 as shown in FIG. 5. The boards may alternatively be inserted preliminarily in all the collar corners before permanent retention is achieved by means of the bolts. One or more holding brackets 200 are before or after attachment of the corner brackets 100 attached to the boards 1a, 1b, 1c, 1d to further attach the boards 1a, 1b, 1c, 1d to the faade 8. Screws or bolts are inserted through receiving apertures 18, 118a, 118b, 218, 318a, 318b into the faade 8 to affix the collar 1 to the faade 8; this may be done before, during or after assembly of the collar 1.

(61) In the embodiment shown the mounting clip 23 forms one part of a clip system. The clip system comprises the mounting clip 23 and a separate plate 27. The face of the first side plate 25 of the mounting clip that faces away from the second side plate has ridges 28. The peaks of the ridges are substantially parallel to the base plate 24 of the clip. The clip system also comprises a separate plate 27 having ridges 29 on one of its faces that are adapted to cooperate with the ridges 28 on the first side plate 25 of the mounting clip. A window frame not shown can be set in place by positioning the window frame in the mounting collar 1 and then pushing the separate plates 27 in between the window frame and the mounting clip 23. The frame is then fixed in place with screws.