# Patent

## Title
Window system having flexible means for mounting

## Abstract

The window system has a substantially rectangular frame structure having four corner sections (1b) and being adapted to be installed in a roof structure and a bracket arrangement comprising a set of bracket units (6b), each bracket unit including a base element (10b) mounted at each corner section of the frame structure. Each bracket unit furthermore comprises at least one supplemental element (20b,40b) adapted to be detachably connected to said base element. One supplemental element comprises a leg element (20b) adapted to be detachably connected to the base element, preferably rotatably and detachably connected with the base element.

## Background
CROSS-REFERENCE TO RELATED APPLICATION
The present application claims the priority under 35 U.S.C. 119 of European Patent Application No. 10197235.4, filed Dec. 29, 2010, which is hereby incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION
The invention relates to a window system comprising a substantially rectangular frame structure having four corner sections and being adapted to be installed in a roof structure, and a bracket arrangement comprising a set of bracket units, each bracket unit including a base element mounted at each corner section of the frame structure. The invention furthermore relates to a method of installing a window system in a roof structure.
Such window systems are installed in many different roof structures under varying conditions. This applies both to the fastening of the window system itself to the subjacent or surrounding roof structure, and to its relation to other window systems which may be installed side-by-side or opposite the window system in question.
The installation of a single window may be cumbersome in itself. This fact has been elaborated on in the prior art, examples being published international application No. WO 88/04348, in which the window is anchored in the roof structure in the way that a number of angular mounting brackets are by one leg fastened to the side members of the window frame, and the window is then mounted in the roof opening and fastened by the second leg by screws to the subjacent roof structure, the rafters, the counter-battens or the battens. However, varying measurements have to be carried out in order to ascertain correct positioning, and the measuring is an obvious source of error and can be the reason for considerable delays during mounting, as an erroneous measuring implies that the mounting bracket has to be removed after the window has been mounted in the roof opening.
In published international application No. WO 99/35355, this problem has been addressed and solved in that the mounting bracket is formed as a corner fitting in which the first leg portion being formed as two leg sections essentially perpendicular to each other for connection with adjacent frame members at the joint hereof. This document furthermore provides for a solution to the positioning of the window next to and side-by-side other windows. However, even though this installation principle provide for a substantially increased ease of installation relative to the prior art, the mounting bracket disclosed in this document has a limited degree of flexibility with regards to its field of use.
An item of prior art concerned with the increase of flexibility is published international application No. WO 00/65171, in which a multipurpose fitting for connection of a frame structure of a panel with a support element is described. This document describes a progress over the prior art, in which particularly designed fittings for fixed panels are usually designed as support fittings with oblique sections defining the possible inclination of the panel, whereas in openable panels, the connection is made by especially designed hinge fittings, and solves the problem that fittings of this kind used in panels for construction of e.g. tilted surfaces must be produced in several various forms because of the structure of the known fittings, dependent on whether the panel is to be openable or fixed and on the inclination of the panel. By the multipurpose fitting of this document, the angle of inclination of the panels is adjusted by means of a separate mounting and hinge fitting, the support element can be produced as a standard product, and the adjustment of the fitting according to the desired inclination can be effected at any time, e.g. on the building site where the final mounting takes place. As the fittings further serve as hinge fittings of the openable panels, an additional standardization is obtained, as all panels can then be prepared for opening and only at a relatively late stage during the project is it necessary to decide whether the individual panel is to be openable or fixed.
SUMMARY OF THE INVENTION
With this background it is an object of the present invention to provide a window system of the kind stated in the introduction, in which an increased standardization and modulation of the production becomes more feasible, and the installation at the building site is facilitated.
In a first aspect of the invention, this object is achieved by a window system, in which each bracket unit furthermore comprises at least one supplemental element adapted to be detachably connected to said base element.
By providing a supplemental element, the desired functionality aimed at needs not be included in the base element. Thus, the base element may in principle be common to all bracket units of the bracket arrangement. Each bracket unit may be tailor-made to the intended use as regards the installation situation of the window system itself in the roof structure, which may be of varying character, and in relation to other elements placed in the roof, for instance relative to other window systems. This makes it possible to fit the window system into the roof structure, both when installing it as a stand-alone window system, and also when the position must be adapted to surrounding structures.
In a preferred embodiment said at least one supplemental element comprises a leg element adapted to be detachably connected to the base element, preferably rotatably and detachably connected with the base element. In this manner, the functionality of providing the mounting means may be adapted to the particular conditions at the installation site. In the preferred development, the rotatable and detachable connection makes it possible to adjust the inclination of the window and accommodate tolerances by rotating the leg element relative to the base element. This is particularly applicable in structural skylights mounted on an upstand, in which the two sides of the upstand on which the top and bottom of the window rest have different heights, thereby defining the angle of the window, and in so-called ridge constellations, in which two windows meet top-to-top resting on a beam and with the bottoms resting on opposite upstands.
In order to keep the base element and other supplemental elements as simple and universally applicable as possible, the leg element may be adapted to be connected to the base element by means of an adaptor element. That is, only in such installation positions requiring further functionalities to be incorporated into the bracket unit by means of a particularly designed adaptor element.
The bracket unit may be adapted to varying installation conditions in many ways. In one embodiment, said leg element includes fastening means for connection to the roof structure, preferably comprising at least one depending folded portion and/or a plurality of apertures. The depending folded portion or portions may be positioned in abutment with a beam placed on the upstand. Further fastening means such as screws may be inserted through the apertures.
In a further embodiment, said at least one supplemental element comprises a spacer element. This makes it possible to provide for the space needed between window systems positioned on top of each other during storage or transportation and protect the window systems by transmitting the weight of the upper window system or systems to the lower window system or systems via the base elements of the bracket units, without parts of the frame structure or other parts of the window system coming into contact with each other.
In a further embodiment, which facilitates positioning several windows on top of each other, the spacer element has an upper end and a lower end, the upper end and the lower end being provided with engagement means, the respective engagement means at the upper end and the lower end being complementary to each other.
In a still further embodiment, said at least one supplemental element comprises a lifting element. The lifting device may for instance be adapted for engagement with a lifting device such as a crane. This makes it possible to lift the entire window system once lifting elements have been attached to the respective base element at a number of bracket units.
The window system according to the invention may assume a number of states represented by the character of the supplemental element or elements connected to the base element. In a state of storage it includes a supplemental element comprising a spacer element; in a state of delivery it includes a supplemental element comprising a lifting element; and in a state of use it includes a leg element, preferably rotatably connected to the base element. Several supplementary elements may be attached to the base element at the same time.
In a particular embodiment, which is suited for window systems mounted in a ridge constellation, the base element includes engagement means, said engagement means being adapted to be connected to a supplemental element constituted by the base element of another window system positioned opposite or next to the window system, the base element of said another window system being provided with engagement means complementary to the engagement means of the base element of the window system.
In a further development of the particular embodiment, the adaptor element is provided with engagement means complementary to the engagement means of the base element.
In a second aspect of the invention, a method of installing a window system in a roof structure is provided. The method comprises the steps of:
providing a substantially rectangular frame structure with four corner sections,
providing a bracket arrangement comprising a set of bracket units, each bracket unit including a base element,
mounting the base element of each bracket unit at each corner section of the frame structure,
selecting at least one supplemental element from the group comprising a leg element, an adaptor element, a spacer element, a lifting element, and the base element of another window system,
connecting the at least one supplemental element detachably to the base element,
optionally detaching one or more supplemental element, and
installing the window system in the roof structure.



BRIEF DESCRIPTION OF THE DRAWINGS
Further details are described, and further advantages stated, in the description of particular embodiments of the invention.
In the following the invention will be described in further detail by means of examples of embodiments with reference to the schematic drawings, in which
FIG. 1 is a perspective view of a window system in an embodiment of the invention;
FIG. 2 is a partial perspective view, on a larger scale of the lower left-hand corner part of the window system shown in FIG. 1;
FIG. 3 is a partial perspective view, on a larger scale of the lower right-hand corner part of the window system shown in FIG. 1;
FIG. 4 is a view corresponding to FIG. 3, in another state with some parts of the window system in the embodiment shown removed;
FIG. 5 is a partial perspective view, on a larger scale of the top part of the window system shown in FIG. 1;
FIG. 6 is a view corresponding to FIG. 5, from a different angle;
FIG. 7 is a partial perspective view on a larger scale, in another state with some parts of the window system in the embodiment shown removed;
FIG. 8 is a view corresponding to FIG. 7, in another state with some parts of the window system in the embodiment shown removed; and
FIG. 9 is a perspective view, on a larger scale of a window system in an embodiment of the invention and details of corresponding window systems interacting with the window system shown.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the several views of the drawings, an embodiment of a window system according to the invention is shown. The window system comprises a substantially rectangular frame structure generally designated 1; apart from this feature, the design of the window system is arbitrary and may for instance take the form of a panel system comprising a frame and sash combination, in which the sash carries a pane and may be opened for ventilation or smoke evacuation purposes, or fixed, that is, not openable relative to the frame structure. Other conceivable designs include a non-transparent or partially transparent panel element such as a solar panel.
The frame structure 1 of the window system has four corner sections 1a, 1b, 1c and 1d and is adapted to be installed in a roof structure (not shown). In the embodiment shown, the frame structure 1 is composed by four frame members 2, 3, 4 and 5, extending between respective corner sections; however, the frame structure may also be a coherent structure. The window system furthermore comprises a bracket arrangement comprising a set of bracket units 6a, 6b, 6c and 6d. According to the main principle underlying the present invention, each bracket unit includes a base element 10a, 10b, 10c and 10d mounted at the respective corner section 1a, 1b, 1c and 1d of the frame structure 1. Additionally, each bracket unit comprises at least one supplemental element adapted to be detachably connected to the base element. The individual configuration of each bracket unit of the embodiment shown will be described in detail further down. In this description, terms such as “lower”, “upper”, “left-hand”, “right-hand”, “side”, “top”, “bottom”, etc. refer to the shown position of the window system only, and is not to be interpreted as limiting the window system to use in a particular position.
Referring now in particular to FIGS. 1 to 5, one such supplemental element comprises, in the embodiment shown, a leg element 20a, 20b, 20c, 20d which in the shown state is connected to the respective base element 10a, 10b, 10c and 10d in a manner which is rotatable and detachable, that is the leg element may be connected and disconnected from the base element by suitable connection means and is able to rotate about an axis of rotation relative to the base element.
In the bracket unit 6a positioned in the corner section 1a in the lower left-hand corner of the frame structure, at the intersection between the bottom frame member 2 and one side member 5, the base element 10a is formed by two substantially plate-shaped parts 11a, 12a such that they together surround the intersection in the corner section 1a and protrude from the frame structure in a plane substantially parallel to that of the frame side member 5. The base element 10a could also be formed as a one-part element. At a distance from the bottom frame member 2, the leg element 20a is connected to the base element 10a in a hinge connection including a bolt 21a and matching apertures (not shown) in the base element 10a and hinge portion 22a of the leg element 20a. The leg element 20a furthermore includes fastening means for connection to the roof structure. In the embodiment shown, the fastening means include two portions 24a and 25a formed as folded portions depending from abutment portion 23a and a plurality of apertures in the folded depending portions. This embodiment is particularly useful in installation conditions involving a beam, for instance positioned on an upstand made to that purpose in a roof.
As shown in FIG. 3, the base element 10b and the leg element 20b of the bracket unit 6b of the lower right-hand corner are configured in manner corresponding to that of bracket unit 6a. In FIGS. 2 and 3, the window system is shown in a state of storage, in which the window system is adapted to be positioned in a stack of similar window systems, for instance up to six window systems. To that end, a supplemental element comprising a spacer element 40a and 40b, respectively, is connected to the respective base element 10a and 10b in a detachable manner, for instance by bolts (not described in detail). The spacer elements 40a, 40b—together with corresponding spacer elements at the top of the window system—provide for the space needed between window systems positioned on top of each other and protect the window systems by transmitting the weight of the upper window system or systems to the lower window system or systems via the base elements of the bracket units, without parts of the frame structure or other parts of the window system coming into contact with each other. Each spacer element has an upper end and a lower end, the upper end 41a and the lower end 42a of the spacer element 40a of the lower left-hand corner section 1a being provided with engagement means, the respective engagement means at the upper end and the lower end being complementary to each other. The spacer element 40b at the lower right-hand corner section 1b may have a similar configuration, or as shown, a lower end ending at the base element 10b. The spacer elements 40a and 40b are connected to each other by means of a transverse bar member 45a by means of suitable fittings 46a, 46b. 
In FIG. 4, showing the lower right-hand corner of the window system, the window system is shown in a state of delivery, in which the spacer elements 40a and 40b have be detached from the respective base element 10a and 10b. Another supplemental element connected detachably to the base element 10b is shown in this Figure, namely a lifting element 50b. Together with corresponding lifting elements in the other corner sections of the window system, this makes it possible to lift the entire window system by means of suitable hoisting means, from the place of delivery, typically on the ground at the building site, or directly from a delivery lorry, up to the roof.
In principle, all base elements of the window system could be formed in an identical manner, and be provided with one or more supplemental elements to adapt the bracket unit to its specific purpose. However, in the embodiment shown, the bracket units 6a, 6b at the bottom part of the window system are substantially identical, and the bracket units 6c, 6d at the top correspond to each other but slightly are different from bracket units 6a, 6b at the bottom part. Referring now to FIGS. 5 to 9, the top part of an embodiment of the window system will be described in detail.
In the embodiment shown in these Figures, the bracket units 6c and 6d correspond to each other and only the bracket unit 6c will be described in detail. The base element 10c comprises two plate-shaped parts 11c, 12c and is connected to a leg element 20c. However, as opposed to the bracket units 6a, 6b at the bottom part of the window system the leg element 20c is connected to the base element 10c by means of an adaptor element 60c. The adaptor element 60c is provided with engagement means 61c complementary to engagement means 13c of the base element 10c. Additional fastening may be provided, for instance in the form of detachable bolts. The leg element 20c is provided with a hinge portion 22c hingedly and detachably connected to the adaptor element 60c by a bolt and is provided with fastening means in the form of abutment portion 23c and a number of suitable apertures.
As at the bottom part of the window system, the bracket units 6c, 6d at the top are provided with spacer elements 40c, 40d at each end of transverse bar 45c. 
Referring to FIG. 6 showing the window system in a state of delivery, the spacer elements 40c, 40d and transverse bar 45c have been removed, and lifting elements 50c, 50d are visible. When the window system has thus been delivered and lifted up to the installation site, the lifting element 50c and the remaining lifting elements are removed thus attaining the state in FIG. 8, in which the window system is ready to be fastened to the underlying roof structure and reach its built-in position of use. During the adaptation to the underlying roof structure, the leg elements 20a-20d are adjusted relative to the base elements 10a-10d to accommodate inclination, tolerances etc.
Referring in particular to FIGS. 8 and 9, a particular use of the window system according to the invention is shown. As shown, the bracket unit 6c is shown in a basic condition, i.e. comprising only base element 10c including its engagement means 13c. The engagement means 10c are adapted to be connected to a supplemental element constituted by the base element 110d of another, second window system positioned opposite to the window system shown, to the base element 310d of a third window system next to the first window system, and to the base element 210c of a fourth window system opposite the third and next to the second, thus making interconnection of four window systems possible. In the embodiment shown, the respective engagement means are complementary to each other.
The window system according to the invention may be used for many different geometrical configurations, e.g. as structural skylights abutting upstands such as an array of long lights forming a light band and ridge constellations.
The invention should not be regarded as being limited to the embodiments shown in the drawings and described in the above. Various modifications and combinations may be carried out within the scope of the appended claims.

## Claims

1. A window system comprising
a generally rectangular frame structure composed of four frame members, the four frame members including a top frame member, a bottom frame member and two side frame members, the rectangular frame structure defining a plane, one of said side frame members defining a plane transverse to the plane of the rectangular frame structure, the rectangular frame structure having four external corner sections, the rectangular frame structure being adapted to be installed in a roof structure; and
a bracket arrangement comprising a set of four bracket units, each bracket unit including a base element mounted at one of the external corner sections of the frame structure at an intersection between the bottom frame member or the top frame member and one of said side frame members, each base element being formed by two generally plate-shaped parts, and the two generally plate-shaped parts lie on opposite sides of the intersection of a corresponding external corner section and protrude from the frame structure in planes generally parallel to said plane of the one of said side frame members, wherein each bracket unit furthermore comprises at least one supplemental element adapted to be detachably connected to said base element.

2. A window system according to claim 1, wherein said at least one supplemental element comprises a leg element adapted to be detachably connected to the base element.

3. A window system according to claim 2, wherein said leg element is adapted to be connected to the base element by means of an adaptor element.

4. A window system according to claim 3, wherein the base element includes engagement means, said engagement means being adapted to be connected to a supplemental element constituted by the base element of another window system positioned opposite or next to the window system, the base element of said another window system being provided with engagement means complementary to the engagement means of the base element of the window system, and wherein the adaptor element is provided with engagement means complementary to the engagement means of the base element.

5. A window system according to claim 2, wherein said leg element includes fastening means for connecting the window system to the roof structure.

6. A window system according to claim 5, wherein said fastening means comprises at least one depending folded portion.

7. A window system according to claim 5, wherein said fastening means comprises a plurality of apertures.

8. A window system according to claim 5, wherein said fastening means comprises at least one depending folded portion and a plurality of apertures.

9. A window system according to claim 2, wherein the leg element is adapted to be rotatably and detachably connected with the base element.

10. A window system according to claim 1, wherein said at least one supplemental element comprises a spacer element.

11. A window system according to claim 10, wherein the spacer element has an upper end and a lower end, the upper end and the lower end being provided with engagement means, the respective engagement means at the upper end and the lower end being complementary to each other.

12. A window system according to claim 1, wherein said at least one supplemental element comprises a lifting element.

13. A window system according to claim 1, wherein each bracket unit of the bracket arrangement of the window system in a state of storage includes a supplemental element comprising a spacer element.

14. A window system according to claim 1, wherein each bracket unit of the bracket arrangement of the window system in a state of delivery includes a supplemental element comprising a lifting element.

15. A window system according to claim 1, wherein each bracket unit of the bracket arrangement of the window system in a state of use includes a leg element connected to the base element.

16. A window system according to claim 15, wherein the leg element is rotatably connected to the base element.

17. A window system according to claim 1, wherein the base element includes engagement means, said engagement means being adapted to be connected to a supplemental element constituted by the base element of another window system positioned opposite or next to the window system, the base element of said another window system being provided with engagement means complementary to the engagement means of the base element of the window system.

18. A method of installing a window system in a roof structure, comprising the steps of:
providing a generally rectangular frame structure composed of four frame members, the four frame members including a top frame member, a bottom frame member and two side frame members, the frame structure defining a plane, a one of said side frame members defining a plane transverse to the plane of the rectangular frame structure, the frame structure having four external corner sections,
providing a bracket arrangement comprising four bracket units, each bracket unit including a base element formed by two generally plate-shaped parts,
mounting the base element of each bracket unit at each external corner section of the frame structure such that the two generally plate-shaped parts lie on opposite sides of an intersection between the bottom frame member or the top frame member and one of the side frame members forming a corresponding external corner section and protrude from the frame structure in planes generally parallel to said plane of the one of said side frame members,
selecting at least one supplemental element from the group comprising a leg element, an adaptor element, a spacer element, a lifting element, and the base element of another window system,
connecting the at least one supplemental element detachably to the base element, and
installing the window system in the roof structure.

19. The method of claim 18, wherein the supplemental element selected in the selection step comprises a leg element, and the leg element is detachably connected with the base element of at least two bracket units.

20. The method of claim 19, wherein a plurality of the leg elements are selected, each leg element being connected detachably to the base element of one of the four bracket units.

21. The method of claim 18, wherein a leg element is connected detachably to the base element of two bracket units, and the base element of the remaining two bracket units is connected with the base element of another window system.

22. The method of claim 18, comprising the step of detaching at least one of the at least one supplemental element before installing the window system in the roof structure.