CN220550771U

CN220550771U - Roof window device

Info

Publication number: CN220550771U
Application number: CN202320660810.4U
Authority: CN
Inventors: 耶斯佩尔·汉德尔·内尔; 西蒙·古洛夫·莫伦伯格; 大卫·达姆·蒙斯泰德; 托比亚斯·克莱门特·朱斯特森
Original assignee: VKR Holding AS
Current assignee: VKR Holding AS
Priority date: 2022-03-31
Filing date: 2023-03-29
Publication date: 2024-03-01
Anticipated expiration: 2033-03-29
Also published as: EP4257772A1; DK202270169A1

Abstract

The present utility model relates to roof window arrangements. In a roof window arrangement, a plurality of window units (21, 22, 23) are arranged in a side-by-side configuration in a common frame (10). At least one window unit (21) includes a fixed non-open pane carrier frame (221) configured to be independently mounted into a common frame (10).

Description

Roof window device

Technical Field

The present utility model relates to a roof window arrangement comprising a plurality of window units in a side-by-side configuration in a mounted state of the roof window arrangement and a cover assembly comprising a set of covers, each window unit comprising at least one pane carrying frame and a pane, wherein at least one window unit of the roof window arrangement comprises a pane carrying frame in the form of an openable sash which is open about a hinge axis defined by a set of hinges, and wherein a common frame is provided as a single fixed frame for all window units of the plurality of window units in a side-by-side configuration, the common frame being configured to be built into a roof surface and comprising a top member, two side members and a bottom member, and the plurality of window units comprising a first window unit comprising a non-open pane carrying frame having a top member, two side members and a bottom member, and at least one adjacent sub-window unit having a pane carrying frame in the form of an openable sash having a top member, two side members and a bottom member. Furthermore, the utility model relates to a method of installing a roof window arrangement.

Background

Roof windows to be installed in inclined roof surfaces are of various types and are either installed as separate window units in which all sides of the roof window meet the roof, or in the following configuration: wherein several window units are built together to combine into a larger array to allow more light to flow into the room of the building, and wherein only the outer side of the outermost window unit meets the surrounding roof.

Typical configurations of double or quadruple roof window arrangements mounted alongside each other and/or above each other are shown and described in applicant's published international application WO 2004/055291 A1 and european patent No. ep1581 706B1, respectively. The window units are typically standard roof windows in which the right side frame member of the left hand window unit is positioned adjacent the left side frame member of the right hand window unit and/or the bottom frame member of the upper window unit is positioned adjacent the top frame member of the lower window unit. In roof structures comprising rafters and battens, it will typically be necessary to remove at least one rafter and a number of battens to provide a sufficiently large aperture in the roof surface and roof structure, while a specially designed slack adjuster is typically installed between the window units and secured to the roof structure in order to ensure sufficient strength and support for the roof window arrangement.

A finer roof window arrangement is shown and described in applicant's german utility model registration No.20 2018 100 516 and european patent No. ep3406818b 1. In the latter document, corresponds to a commercial counterpartThe roof light window, two rows of every three window units are connected to respective frame structures positioned at an obtuse angle with respect to each other, such that the roof window arrangement protrudes from the roof surface.

The standard roof window constituting the window unit of the prior art roof window arrangement is mounted with a relatively small distance between adjacent side frame members, typically about 18mm, which leaves sufficient space for the regulator or the like. All the above roof window arrangements have in common that the window units are protected from weather by means of a cover assembly comprising a combination of a protective element, a cover element and a cladding element, which provide a weather-tight transition to the surrounding roof and ensure tightness around each window unit and between adjacent window units. Even though the prior art covering assemblies function well, they rely on a relatively large number of custom parts that must be manufactured, stored, transported and assembled at the construction site.

To alleviate these challenges, applicant's published european patent application EP3 828,399 a1 shows and describes a roof window arrangement of the type mentioned in the introduction. While providing a great degree of standardization and achieving the desired "slim appearance" due to the reduced distance between adjacent window units, the installation of roof window arrangements has proven challenging.

Disclosure of Invention

Against this background, it is therefore an object of the present utility model to provide a roof window arrangement by means of which installation can be facilitated.

This and further objects are achieved by a roof window arrangement of the type mentioned in the introduction, further characterized in that the common frame further comprises at least one mullion extending between the top member and the bottom member and being substantially parallel to both side members of the common frame, wherein in an installed state of the roof window arrangement each side member of the pane carrying frame of the first window unit is configured to abut a respective one of the mullion and side member of the common frame, and wherein at least the pane carrying frame of the first window unit is configured to be releasably connected to the mullion or to the mullion and side member of the common frame in order to allow the first window unit to be installed independently of the installation of the common frame.

In this way, the pane carrying frame of the fixed, i.e. non-open, window unit can be rested while the common frame is installed in the first installation step. In general, the sub-window unit or units may be removed from the common frame in any case, and thus, the installation of the common frame occurs without increasing the weight. The mullion or mullions provide additional stability to the common framework so that it is easier to maintain a rectangular shape.

Other presently preferred embodiments and further advantages will become apparent from the following detailed description and the accompanying drawings.

Drawings

In the following description, embodiments of the utility model will be described with reference to the accompanying drawings, in which:

fig. 1 is an isometric view of a roof window arrangement in a first embodiment of the utility model, seen from the inside of the roof window arrangement in an installed state;

FIG. 2a is an exploded perspective view of a common frame with mullion of a roof window arrangement in a first embodiment;

FIG. 2b is a perspective view of a common frame according to some embodiments, wherein the mullion is integrally formed and the common frame is configured for pivotally suspended sub-windows;

FIG. 2c is a perspective view of a common frame according to other embodiments of the present utility model, wherein the mullion is integrally formed and the common frame is configured for an overhead sub-window;

fig. 3 is a perspective view from the outside of the roof window arrangement of the first embodiment;

fig. 4 is an isometric view of a roof window arrangement in a second embodiment of the utility model, seen from the inside;

FIG. 5 is an exploded perspective view of a common frame with mullion of a roof window arrangement in a second embodiment;

fig. 6 is a perspective view of a roof window apparatus of a second embodiment, as seen from the outside;

FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6;

FIG. 8 is a larger scale cross-sectional view of the detail shown in FIG. 7;

FIG. 9 is a view corresponding to FIG. 5 with further details of the roof window arrangement of the second embodiment;

FIGS. 10 and 11 are schematic isometric views of a roof window arrangement of a second embodiment during a step of installing a non-open fixed window unit;

fig. 12 and 13 are schematic isometric views of a roof window arrangement of a second embodiment, showing the removal of a fixed window unit;

fig. 14 and 15a and 15b are views corresponding to fig. 10 and 11 of a roof window arrangement of a first embodiment, wherein fig. 15a shows an embodiment in which the first window is fastened to the mullion and fig. 15b shows an embodiment in which the first window is fastened to the top member of the common frame;

fig. 16 is a perspective view of the roof window apparatus of the first embodiment in a use state;

FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 3;

FIG. 18 is a larger scale cross-sectional view of the detail shown in FIG. 17;

FIG. 19 is a perspective cross-sectional view taken along a line parallel to line XVII-XVII in FIG. 3;

fig. 20 is an exploded perspective view of a detail of the roof window arrangement in the first embodiment;

FIG. 21 is a partial perspective view, on a larger scale, of a detail of the roof window arrangement shown in FIG. 20;

FIGS. 22 and 23 are perspective views of the roof window arrangement shown in FIG. 20 at different detail angles;

FIG. 24 is a cross-sectional view taken along line XXIV-XXIV in FIG. 3; and

fig. 25 is a perspective sectional view generally corresponding to fig. 24.

Detailed Description

In the figures of the drawings, embodiments of roof window arrangements according to the utility model are shown.

Referring first to fig. 1 to 3, a first embodiment of a roof window arrangement 1 is shown, the roof window arrangement 1 comprising a plurality of window units 21, 22, 23 configured side by side, and the roof window arrangement 1 being viewed from the inside of a room of a building having a roof surface (not shown), wherein the roof window arrangement 1 is mounted in a mounted state of the roof window arrangement 1. In the illustrated embodiment there are three window units 21, 22, 23, but other configurations involving two or more than four window units are conceivable as will be described below in connection with the second embodiment.

Each window unit 21, 22, 23 includes a pane carrying frame 211, 221, 231 and a pane 214, 224, 234. The common frame 10 serves as a single fixed frame for all of the plurality of window units 21, 22, 23 in a side-by-side configuration. The common frame 10 is configured to be built into a roof surface and connected to an underlying roof structure by means of a set of fittings represented by the mounting brackets 3.

A cover assembly indicated generally at 5 is also shown. The cover assembly 5 provides coverage for each window unit, as will be described in further detail below.

Fig. 2a shows a common frame 10 comprising a frame top member 11 of the common frame 10, two frame side members 12 and 13 and a frame bottom member 14, which frame top member 11 in mounted state spans all three window units 21, 22, 23.

At least one mullion 15, 16, 17 may be fastened to the common frame 10 by fastening means such as screws. In other reliable embodiments, as shown in fig. 2b and 2c, the common frame 10 and stiles 15, 16, 17 are integrally formed. In such embodiments, the common frame and mullion are preferably made of a suitable polymer, such as polyurethane. The common frame may be manufactured by cast molding. Alternatively, in an embodiment not shown, the engagement between the mullion and the common frame may be provided by, for example, a form locking engagement, thereby avoiding the use of separate fastening means.

The size of the window unit forming part of the roof window arrangement is typically selected according to the particular installation conditions including the room area of the building, the roof surface available, etc. In the following configuration with three window units 21, 22, 23, the overall external dimensions wf, hf of the common frame 10 generally exhibit a significantly reduced width wf compared to the total width of three standard roof windows with panes of the same size. The height hf generally corresponds to the height of a standard roof window.

In the first embodiment, the common frame 10 further comprises two stiles 15, 16, which two stiles 15, 16 extend between the top member 11 and the bottom member 14 and are substantially parallel to the two side members 12, 13 of the common frame 10.

In the embodiment shown in these figures, the three window units 21, 22, 23 have the following configuration:

referring to fig. 1, the first window unit 21 has a pane carrying frame 211, and the pane carrying frame 211 has a top member 2111, two side members 2112 and 2113, and a bottom member 2114. As will be described in further detail below, the pane carrying frame 211 constitutes a fixed, i.e. non-open, structure and is configured to be mounted independently of the remaining components of the roof window arrangement 1. Hereinafter, the first window unit 21 is referred to as "fixed". "fixed" will be interpreted as a synonym for "non-open"; as will be apparent, at least some portions of the first window unit 21 are configured to be releasably connected to other portions of the roof window arrangement 1. Each portion of the first window unit 21 to be independently connected to the common frame 10 includes at least a pane carrying frame 211. Pane 214 is to some extent the heaviest element of first window unit 21.

The second window unit 22 has a pane carrying frame in the form of an openable window sash 221, which openable window sash 221 has a top member 2211, two side members 2212, 2213 and a bottom member 2214, and the third window unit 23 has a pane carrying frame in the form of an openable window sash 231.

The overall configuration of the third window unit 23 corresponds generally to the openable window sash 221, and only the elements of the third window unit 23 will be described where appropriate. In the embodiment shown, the second window unit 22 is positioned between the first window unit 21 and the third window unit 23.

The openable second and third window units 22, 23 are configured to be suspended during normal use, thereby representing a first operational state in which each openable window sash 221, 231 is rotatable about a primary hinge axis α1 (shown in fig. 3), but each openable window sash 221, 231 is capable of assuming a second operational state in which the openable window sashes 221, 231 are pivoted about a secondary hinge axis α2 for cleaning purposes. Details of the principles allowing such operation and coupling to lifting devices are found in applicant's european patent No.0733 146B1 and international published application WO 2019/101281.

During normal use, the opening and closing of the openable sashes 22, 23 is performed by means of handles 227, 237 connected to the respective bottom members 2214, 2314. The activation of the second operational state is by the vent baffles 228, 238 (shown in fig. 17) located at the respective top members 2211, 2311.

Also seen in fig. 2a is a stiffening member 111 located at the frame top member 11. Such a reinforcing member is known from EP3 564 460b1 of the applicant.

Referring now to fig. 4 to 6, views corresponding to fig. 1 to 3 of a second embodiment are shown, wherein two window units 21 and 22 are present in a common frame 10. In the first embodiment and the second embodiment, reference numerals having the same or similar functions are denoted by the same reference numerals, and only differences will be discussed in detail.

Here, the common frame 10 includes a single mullion 17.

In the second embodiment, the first window unit 21 is fixed and the second window unit 22 is openable. The openable window sash 221 of the second window unit 22 is opened about a hinge axis α (as shown in fig. 10) defined by a set of hinges 212, 213, 232, 233. The hinge may be of any suitable kind, shown here as a pivoting hinge as disclosed for example in applicant's EP1 038 083b1, EP1 781 883b1, EP 2 770 146A1 and EP 2 770 1499 A1, or as a so-called telescopic hinge as described in applicant's pending international application WO 2017/076416 A1. The set of hinges of each of the first window unit 21 and the third window unit 23 comprises two sash hinges 212, 213, 232, 233 connected to the respective openable sashes 211, 231.

Referring to fig. 7, a first window unit 21 is shown wherein each side member 2112, 2113 of the pane carrying frame 211 of the first window unit 21 abuts against mullion 17 and side member 12 of the common frame. The pane carrying frame 211 of the first window unit 21 is releasably connected to the mullion 17 and side members 12 of the common frame 10 so as to allow the first window unit 21 to be installed independently of the installation of the common frame 10.

Again, this ensures that the first window unit 21 is configured to be installed independently of the installation of the adjacent sub-window unit 22.

The pane carrying frame 211 of the first window unit 21 may alternatively and/or additionally be releasably connected to the top member 11 of the common frame 10 and/or the bottom member 14 of the common frame 10. Thus, in some very reliable embodiments, the pane carrying frame 211 of the first window unit 21 is releasably connected to the top member 11 of the common frame 10, as shown in fig. 15 b. By releasably connecting only to the top member 11 of the common frame 10, the window is securely fastened, while reducing the number of fastening means and reducing installation time.

The inner side of the side members 12 and mullion 17 facing the pane carrying frame 211 of the first window unit 21 is configured to allow the pane carrying frame 211 to be mounted from the inner side of the roof window arrangement 1 when the common frame 10 is in its mounted state.

As shown in fig. 11 and 13, side members 2113 of the pane carrying frame 211 of the first window unit 21 are secured to mullion 17 by releasable fastening means 4 comprising a set of screws 41 and a cover plug 42. The pane carrying frame 211 of the first window unit 21 is detachable from the common frame 10 from the inner side of the roof window arrangement 1 without fastening means 4. The pane carrying frame 211 may be fixed to the top member 11 of the common frame 10 and/or the bottom member 14 of the common frame 10 by releasable fastening means 4 comprising a set of screws 4a and cover plugs 4 b.

The cover assembly 5 of the roof window arrangement 1 in the first embodiment shown in fig. 3 will now be described in more detail. Reference will also be briefly made to fig. 24 and 25. This description will be made in conjunction with the description of the cover assembly 5 of the second embodiment shown in fig. 6.

A set of covers of the cover assembly 5 associated with the first window unit 21 is fastened to the components of the common frame 10 and to adjacent sub-window units 22, 23.

Adjacent secondary window units 22, 23 are suspended about the primary hinge axis α1 in the first operating state. The secondary window unit includes handles 227, 237 (shown in fig. 1), the handles 227, 237 including latch mechanisms (shown in fig. 2 a) that cooperate with one of the strike plates 142a, 142b, 143a, 143 b. As shown in fig. 1, the secondary unit 22, 23 further comprises a ventilation flap 228, 238, which ventilation flap 228, 238 is adapted to provide ventilation and to allow activation of a second operating state in which the window sashes 221, 231 of the secondary window unit 22, 23 are pivotable about the secondary hinge axis α2.

In fig. 3, the cover assembly 5 comprises a top housing 5220, 5230, two side sash covers 5221a, 5222a, 5231a, 5232a, two side frame covers 5221b, 5222b, 5231b, 5232b and bottom sash covers 5223, 5233 for each sub-window unit 22, 23. The cover assembly further comprises a top housing 511 and a bottom cover 514 for the first window unit 21. The top case 511 is connected to the frame top member 11 of the common frame 10. The bottom cover 514 is connected to the frame bottom member 14 of the common frame 10.

Each of the adjacent sub-window units 22 is pivotally suspended about a hinge axis by means of a hinge assembly 6 (shown in fig. 8).

Referring to fig. 6, the cover assembly 5 further comprises a common top housing 510 connected to the frame top member 11 of the common frame 10, two lower side sash covers 5221, 5222, an upper side frame cover 513 and a mullion side frame cover 517. The cover assembly 5 further comprises a bottom sash cover 5223 for each secondary window unit 22, two side covers 512a, 512b and a bottom cover 514 for the first window unit 21. The side covers 512a, 512b are connected to frame side members 12 (not shown) of the common frame 10. The bottom cover 514 is connected to the frame bottom member 14 (not shown) of the common frame 10.

Referring now to fig. 7 and 8, the frame side members 12 of the common frame 10 include frame insert elements 18. Side cover 512a is connected to frame insert element 18.

Each pane 214, 224 is associated with a set of sash profiles 541, 542, the set of sash profiles 541, 542 acting as glazing beads at the border portions of the panes 214, 224, 234. Glazing beads 541 of the pane carrying frame 211 of the first window unit 21 cooperate with an adapter profile 550 connected to the adjacent mullion 17. The adapter profile 550 in turn cooperates with the side sash covers 5222, 5222a of adjacent secondary window units 22.

The lifting device 7 better shown in figures 18 and 20 is accommodated by the stiles 15 or side frame members of the common frame 10.

The adapter profile 550 is connected to the mullion 15 by means of the support element 19 better shown in figures 22 and 23. The support element 19 comprises a bearing portion 191 and a bushing portion 192. The carrier 191 includes a base portion 191a, an upstanding portion 191b, an overhang portion 191c, and a top portion 191d having an opening. The bushing portion 192 includes a wall portion 192a, a side portion 192b, a front portion 192c, a protrusion 192d, and a snap hook 192e such that the bushing portion 192 is held to the carrier 191.

The utility model is not limited to the embodiments shown and described above, but various modifications and combinations can be made.

The preferred way of installing the roof window arrangement 1 is performed by the following steps:

mounting the common frame 10 in a roof structure of a building;

at least the pane carrying frame 211 of the first window unit 21 is disposed in the common frame 10 from the inside of the building such that each of the side members of the pane carrying frame 211 of the first window unit 21 abuts one of:

mullions 15, 16;17,

side members 12 of the common frame 10;

releasably fastening each of the side members of the pane carrying frame 211 of the first window unit 21 to the abutting mullions 15, 16 with fastening means 4; 17 and one of the abutting side members of the common frame.

List of reference numerals

1 roof window device

10 sharing frame

11 frame roof member

111 reinforcing member

12 frame side member

13 frame side member

14 frame bottom member

142a anti-striking plate

142b anti-striking plate

143a anti-striking plate

143b anti-striking plate

15 mullion

16 mullion

17 mullion

18 frame insert element

19 support element

191 bearing part

191a base portion

191b upstanding portion

191c overhang

191d top portion

192 bushing portion

192a wall portion

192b side portions

192c front portion

192d projection

192e clasp 21 first window unit (fixed)

211 pane load-bearing frame

2111 top member

2112 side member

2113 side member

2114 bottom member

214 pane

2141 Window sash section bar 22 second Window unit (openable)

221 pane carrier frame

2211 top member

2212 side member

2213 side member

2214 bottom member

2215 insulator

222 window sash hinge (Right side)

223 window sash hinge (left side)

224 pane

2241 window sash section bar

227 handle

228 ventilation baffle

Third window unit

231 pane load-bearing frame/sash

2311 Top Member

2312 side pieces

2314 base member

234 pane

237 handle

238 ventilation baffle

3 mounting bracket

4 fastening device

41 screw

42 cover plug

5 cover assembly

501 top frame cover

510 share a top housing

511 top casing (first window unit)

512a lower side cover

512b upper side cover

513 upper side frame cover

514 bottom cover

517 mullion side frame cover

5211

5220 top casing (second window unit)

5221 lower side window sash cover

5221a side sash cover

5221b side frame cover

5222 lower side sash cover

5222a side sash cover

5222b side frame cover

5223 bottom sash cover

5230 top casing (third window unit)

5231a side sash cover

5231b side frame cover

5232a side sash cover

5232b side frame cover

5233 bottom sash cover

541 frame section bar

542 frame section bar

550 adapter section bar

6 hinge assembly

7 lifting device

height of hf frame

width of wf frame

α1 main hinge axis (suspension)

α2 secondary hinge axis (pivot position) αhinge axis.

Claims

1. A roof window arrangement comprising a plurality of window units in a side-by-side configuration in an installed state of the roof window arrangement and a cover assembly comprising a set of covers, each window unit comprising at least one pane carrying frame and a pane, wherein at least one window unit of the roof window arrangement comprises a pane carrying frame in the form of an openable sash which is open about an articulation axis defined by a set of hinges, and wherein a common frame is provided as a single fixed frame for all window units of the plurality of window units in a side-by-side configuration, the common frame being configured to be built into a roof surface and comprising a top member, two side members and a bottom member, and the plurality of window units comprising a first window unit comprising a non-open pane carrying frame having a top member, two side members and a bottom member, and at least one adjacent sub-window unit having a openable sash carrying frame in the form of an openable sash having a top member, two side members and a bottom member,

it is characterized in that the method comprises the steps of,

the common frame further includes at least one mullion extending between the top member of the common frame and the bottom member of the common frame and generally parallel to the two side members of the common frame,

in the installed state of the roof window arrangement, each side member of the pane carrying frame of the first window unit is configured to abut a respective one of:

mullion

The side members of the common frame,

and, at least the pane carrier of the first window unit is configured to be releasably connected to the mullion or to the mullion and the side members of the common frame so as to allow the first window unit to be installed independently of the installation of the common frame.

2. The roof window arrangement of claim 1, wherein the first window unit is configured to be installed independently of the installation of the at least one adjacent sub-window unit.

3. A roof window arrangement according to any one of claims 1 and 2, wherein each side member of the common frame and an inner side of each mullion facing the pane carrying frame of the first window unit are configured to allow the pane carrying frame to be mounted from the inner side of the roof window arrangement, the common frame being in its mounted state.

4. A roof window arrangement according to any one of claims 1 and 2, wherein each of the side members of the pane carrying frame of the first window unit is secured to one of the stiles and side members of the common frame by releasable fastening means.

5. The roof window arrangement of claim 4, wherein the releasable fastening means comprises a set of screws and a cover plug.

6. The roof window arrangement of claim 4, wherein said pane carrying frame of said first window unit is detachable from said common frame from an interior side of said roof window arrangement without said fastening means.

7. A roof window arrangement according to any one of claims 1 and 2, wherein the set of covers of the cover assembly associated with the first window unit is fastened to a component of the common frame and/or to the at least one adjacent sub-window unit.

8. The roof window arrangement of claim 7, wherein at least one of the adjacent secondary window units is suspended about a primary hinge axis in the first operational state.

9. The roof window arrangement of claim 8, wherein the at least one secondary window unit includes a handle including a latch mechanism that mates with the at least one strike plate.

10. A roof window arrangement according to any one of claims 8 and 9, wherein the at least one secondary window unit comprises a ventilation flap for providing ventilation and allowing a second operational state in which the openable sash of the secondary window unit is pivotable about a secondary hinge axis.

11. The roof window arrangement of claim 8, wherein the cover assembly includes a top housing, two side sash covers, two side frame covers, and a bottom sash cover for each secondary window unit, and a top housing and a bottom cover for the first window unit, the top housing for the first window unit being connected to the top member of the common frame and the bottom cover being connected to the bottom member of the common frame.

12. A roof window arrangement according to claim 7, wherein each of said at least one of said adjacent sub-window units is pivotally suspended about a hinge axis by means of a hinge assembly.

13. The roof window arrangement of claim 12, wherein said at least one secondary window unit includes a vent baffle to provide ventilation and operation.

14. A roof window arrangement according to claim 12, wherein the cover assembly comprises a common top housing for each sub-window unit connected to the top member of the common frame, two lower side sash covers, an upper side frame cover, a mullion side frame cover and a bottom sash cover, and at least one side cover and a bottom cover for the first window unit, the at least one side cover being connected to a side member of the common frame and the bottom cover being connected to the bottom member of the common frame.

15. The roof window arrangement of claim 14, wherein at least one of the side members of the common frame includes a frame insert element and at least one side cover is connected to the frame insert element.

16. A roof window arrangement according to any one of claims 1 and 2, wherein each pane is associated with a set of sash profiles serving as glazing beads at the border portions of the panes.

17. The roof window arrangement of claim 16, wherein the glazing bead of the pane carrying frame of the first window unit mates with an adapter profile connected to an adjacent mullion, which in turn mates with a side sash cover of the adjacent secondary window unit.

18. The roof window arrangement of claim 17, further comprising a lifting device received by a mullion or side frame member of the common frame.

19. A roof window arrangement according to claim 18, characterized in that the adapter profile is connected to the mullion by means of a support element.

20. A roof window arrangement according to claim 19, wherein the support element comprises a bearing portion and a bushing portion.

21. The roof window arrangement of claim 20, wherein the carrier includes a base portion, an upstanding portion, an overhang portion, and a top portion having an opening.

22. A roof window arrangement as claimed in any one of claims 20 and 21, wherein the bushing comprises a wall portion, a side portion, a front portion, a tab and a snap hook such that the bushing is retained to the carrier.