Roof window

Abstract

The utility model relates to a roof window (100). In the roof window (100), the lifting device (10) further comprises a lifting arm (14) inserted between the main frame (1) and the at least one sub-frame. The lifting arm (14) has a first end (12) which is rotatably connected to a carriage (30) which is slidably connected to the main frame (1) in a carriage guide (16) and a second end (13) which is rotatably connected to the at least one sub-frame. The lifting device (10) also includes a spring assembly (20) configured to be coupled to the carriage (30).

Description

Technical Field

[0001] The invention relates to a roof window having a fixed main frame, at least one secondary frame comprising a window sash, and a lifting device comprising a lifting arm inserted between the main frame and the at least one secondary frame. Background Art

[0002] Windows for installation in sloping roof surfaces can be provided in many variants and include more or less complex operating structures to allow the sash to be opened and to achieve other functions such as ventilation. Such roof windows include a type that is hinged at or near the center, a top-hinged type, and finally a roof window that is top-hinged during normal operation, but in the last roof window that is top-hinged during normal operation, the sash is able to perform a rotational movement substantially at a central axis for cleaning or for providing an alternative operating mode. Roof windows of the top-hinged type have a first articulation axis provided by a top articulation device to provide a first operating state, while in a second operating state the rotation of the sash is performed by means of an intermediate frame in which the sash is articulated to provide a second articulation axis. Typically, one hinge of the articulation device will be located on either side of the roof window to define a substantially horizontal articulation axis.

[0003] For example, examples of top-hinged windows with a second operating state are disclosed in the applicant's WO-A-89 / 10460, EP 0 733 146 B1, EP 1 873 323 B1, EP 2 762665 A2 and WO 2019101281 A1. In order to enable the window sash to be rotated about 180° to a convenient cleaning position, the sash structure is connected to an intermediate frame with a frame arm, which is positioned between the upper part of the frame and the sash side member in the closed position of the window, and the frame arm follows the sash side member during normal use of the window as a top-hung window.

[0004] In roof windows whose operation is wholly or partly about an articulation axis at the top, it is known to counterbalance at least part of the weight of the movable part by means of a lifting device. The purpose of this arrangement is to facilitate opening the window, and the dimensions may be chosen so that the springs can hold the top articulated frame in a balanced manner in the desired open position.

[0005] Such a lifting device is disclosed, for example, in the applicant's WO 2019 / 101281 A1, in which a spring assembly acts as a force-balancing element of the pane carrying frame by operating on a lifting arm attached to the frame.

[0006] However, although the lifting devices in the above examples are able to provide the desired force balance to some extent, there is still room for improvement. Utility Model Content

[0007] In this context, the object of the present invention is to provide a roof window with a lifting device which has increased design flexibility allowing desired movement patterns and is easy to operate.

[0008] This is achieved by a roof window of the kind mentioned in the introduction, which is further characterized in that the lifting arm has a first end and a second end, the first end being rotatably connected to a carriage, the carriage being slidably connected to the main frame in a carriage guide, and the second end being connected to at least one sub-frame. The lifting device further comprises a spring assembly configured to be coupled to the carriage. The lifting device further comprises an adjustment arm having a first end rotatably connected to the lifting arm and a second end rotatably connected to the carriage guide, wherein the second end of the lifting arm is arranged to move translationally along the sub-frame.

[0009] This arrangement of the arms and the interconnection of the arms with the carriage in the carriage guide provides a comfortable operation of the roof window. During opening and closing of the roof window, the lifting arm is moved translationally in the carriage guide in the sliding direction of the carriage by the rotational connection to the carriage at the first end of the lifting arm. At the same time, the second end of the lifting arm is moved translationally along the subframe. This provides a low-friction opening / closing movement of the roof window. The translational movement is understood to be a displacement of the second end of the lifting arm from point A to point B on the subframe. The translational movement can be linear and / or cyclic.

[0010] A roof window is provided, which includes: a fixed main frame, at least one sub-frame, and a lifting device, the lifting device including a lifting arm inserted between the main frame and the at least one sub-frame, the lifting arm having a first end and a second end, the first end being rotatably connected to a slide, the slide being slidably connected to the main frame in a slide guide, and the second end being connected to at least one sub-frame, the lifting device also including a spring assembly configured to be coupled to the slide, the lifting device also including an adjusting arm, the adjusting arm having a first end rotatably connected to the lifting arm and a second end rotatably connected to the slide guide, wherein the second end of the lifting arm is arranged to move translationally along the sub-frame.

[0011] The at least one sub-frame is a window sash and / or an intermediate frame.

[0012] The second end of the lifting arm and the secondary frame have a roller connection via the sash wheel.

[0013] The sash wheel is configured to roll on a wheel guide during an opening and / or closing movement of the roof window, the wheel guide being connected to the sub-frame.

[0014] The lifting arm is connected to the sash wheel via sash wheel rivets.

[0015] The sash wheel comprises 25%-45% glass fiber by volume.

[0016] The sash wheel and / or the wheel guide have cooperating serrations.

[0017] The adjustment arm is rotatably connected to the carriage guide via an adjustment system.

[0018] The adjusting arm and the lifting arm are connected at an angle α1 , wherein the angle α1 assumes a second angle α2 by adjusting the position of the second end of the adjusting arm by means of the adjusting system.

[0019] The adjustment system includes an adjusting screw.

[0020] The adjustment system further includes an adjustment bushing, wherein the second end of the adjustment arm is connected to the adjustment screw through the adjustment bushing.

[0021] The carriage guide also includes an adjustment slot, wherein the adjustment system is configured to be received in the adjustment slot.

[0022] The adjustment bushing is configured to engage with the adjustment slot.

[0023] The carriage guide includes an opening adapted to receive a machine tool.

[0024] The machine tool is a drill bit fitted to an adjustment system.

[0025] Roof windows also include insulated glass units.

[0026] The carriage includes carriage wheels configured to roll on the carriage guides and / or travel members mounted on the carriage and configured to cooperate and / or engage with the carriage guides.

[0027] The adjustment system also includes an adjustment base secured to the carriage guide.

[0028] The sash wheel has a diameter of approximately 30 mm.

[0029] The sash wheel has one or more cavities.

[0030] The sash wheels are moulded.

[0031] Other presently preferred embodiments and further advantages will become apparent from the ensuing detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In the following description, embodiments of the present invention will be described with reference to the accompanying drawings, in which:

[0033] Figure 1Ais a perspective view of a roof window in an embodiment of the present invention as seen from the inside;

[0034] Figure 1B yes Figure 1A A perspective view of the roof window from the outside;

[0035] Figure 1C is a cross-sectional perspective view of a roof window in another embodiment, wherein the sash is in an open position.

[0036] Figure 2 is a perspective view of a lifting device for a roof window in an embodiment according to the invention in a first operating state.

[0037] Figure 3A is a side view of a lifting device for a roof window in an embodiment according to the invention in a closed position of the window and wherein the carriage is not attached to the spring assembly.

[0038] Figure 3B is a side view of a lifting device for a roof window in an embodiment according to the invention in an open position of the window and wherein the carriage is attached to the spring assembly.

[0039] Figure 4 is a close-up perspective view of a lifting device for a roof window in an embodiment according to the invention showing a sash wheel mounted in a lifting arm and connected to a wheel guide.

[0040] Figure 5 is a close-up perspective view of a lifting device for a roof window in accordance with another embodiment of the invention showing a sash wheel mounted in a lifting arm and connected to a wheel guide.

[0041] Figure 6 is a close-up perspective view of a lifting device for a roof window in an embodiment according to the invention, showing a carriage guide, an adjustment arm and a part of a lifting arm and how these elements are connected.

[0042] Figure 7 is a close-up perspective view of a lifting device for a roof window in an embodiment according to the invention, showing a carriage guide, an adjustment arm and a part of the lifting arm from another angle and how these elements are connected.

[0043] Figure 8 is a close-up perspective view of a lifting device for a roof window in an embodiment according to the invention, showing a carriage guide, an adjustment arm and a part of the lifting arm from another angle and how these elements are connected.

[0044] Fig. 9is a perspective view of a lifting device for a roof window in an embodiment according to the invention, showing a central plane P.

[0045] Fig.10 1 is a side view of a lifting device for a roof window in an embodiment according to the invention in an operating state, in which the adjusting arm is adjusted to form an angle α1 relative to the lifting arm.

[0046] Fig.11 is a side view of a lifting device for a roof window in an embodiment according to the invention in another operating state, in which the adjustment arm is adjusted to an angle α2 relative to the lifting arm by introducing the tip of a mechanical tool such as a drill bit into an opening in the slide guide, wherein the drill bit is assembled to an adjustment screw connected to the adjustment arm.

[0047] Fig. 12A A mechanical tool is shown interacting with an adjustment system for a lifting device for a roof window in an embodiment according to the invention, the adjustment system being adjusted for a specific roof pitch.

[0048] Fig. 12B A mechanical tool is shown interacting with an adjustment system for a lifting device for a roof window in an embodiment according to the invention, the adjustment system being adjusted for use with Fig. 12A The roof pitches shown in the different roof pitches. DETAILED DESCRIPTION

[0049] In the following, embodiments of the lifting device and the roof window will be described in more detail. When referring to the drawings, the terms upper, lower, upwards, downwards, top and bottom are adopted relative to how the drawings are shown. The front view is adopted when looking from the hinge and towards the window frame. Thus, the rear view is adopted when looking from the frame towards the hinge. If nothing else is mentioned, the longitudinal direction is the longitudinal direction along the length of the member. It should be understood that the arrangement shown in a horizontal orientation is not a normal orientation when the window is installed on a sloping roof.

[0050] First refer to Figure 1A and Figure 1B , a roof window 100 is shown. The roof window 100 is intended to be installed in a sloping roof surface (not shown).

[0051] The roof window 100 comprises a main frame 1, a secondary frame 2 such as a sash, and a window pane 4. The main frame 1 comprises a set of frame members, including a top frame member, two side frame members, and a bottom frame member. Correspondingly, the sash comprises a set of sash members, including a top sash member, two side sash members, and a bottom sash member. Although the main frame 1 and the sash 2 are described as rectangular structures, some principles of the proposed concept can also be applied to other geometric shapes.

[0052] The pane 4 includes a plurality of edge portions that are typically associated with the components of the sash 2, which will be described in further detail below. In the assembled state of the roof window 100, the outer pane surface 4e defines the plane of the roof window 100. The assembled state of the roof window 100 is achieved when the main components of the main frame 1 and the sash 2 have been assembled and the main frame 1 and the sash 2 are connected to each other, for example in an installed position when the roof window 100 is ready for use. Correspondingly, the assembled state of the sash 2 is achieved once the main components of the sash 2 have been assembled, and the assembled state of the main frame 1 is achieved when the main components of the main frame 1 are assembled. The term "main components" should be understood to include the main components of the roof window required to perform all operating functions without including accessories or auxiliary equipment.

[0053] The inner pane surface 4i faces inwards, typically towards a room of the building below the roof surface on which the roof window 100 is mounted.

[0054] In the embodiment shown, the sash 2 can be opened relative to the main frame 1 to obtain one or more open positions. In these open positions, the sash 2 and the window pane 4 are moved out of the plane of the roof window 1. As will be described below, the sash 2 is shown as top-hung, that is, during normal use, the sash 2 rotates around a generally horizontal hinge axis at or near the top frame member and the top sash member. However, it is conceivable that some of the principles of the concept proposed for the roof window are applied to different types of windows with other opening modes or provided as fixed skylights.

[0055] Figure 1A Further details shown in the include an operating assembly, shown here as a handle.Other operating assemblies may also be present.

[0056] Also shown is a representative mounting bracket that forms part of a plurality of mounting brackets that form a load transferring connection between the roof window 100 and a surrounding roof structure (not shown). Such a roof structure may include rafters and battens, plywood or other construction materials.

[0057] An insulating frame is shown. Insulation by an insulating frame is optional and may be provided along only some of the frame members, or around all four frame members as shown.

[0058] Reference Figure 1C , showing that the roof window 100 also includes a hinge assembly.

[0059] The hinge assembly is configured so that it allows the sash 2 to be top-hung in a first operating state corresponding to normal use. That is, during normal use, the sash 2 rotates between a closed position and an open position around a substantially horizontal first hinge axis at or near the top frame member and the top sash member.

[0060] Figure 2 A lifting device 10 is shown installed in a roof window 100 having a main frame 1 and a sub-frame 2. The lifting device is installed between the main frame 1 and the sub-frame 2 and comprises a carriage guide 16 fixed to the main frame 1 and a lifting arm 14 having a first end 12 which is rotatably connected or fixed to a carriage 30 sliding in the carriage guide 16. At a second end 13 of the lifting arm 14, a sash wheel 40 is attached to the lifting arm 14. Figure 2 In FIG, the connection between the subframe 2 and the lifting arm 14 is shown as a sash wheel 40 attached to the lifting arm 14 by means of wheel rivets 42. Thus, the sash wheel 40 is rollingly connected to the subframe by means of the sash wheel 40. Other attachments can be envisaged. Figure 2 In the embodiment shown in , the sash wheel 40 is configured to roll on a wheel guide 41. The wheel guide 41 acts as a guide for the sash wheel during opening and closing of the window. The wheel guide 41 also provides protection for the sub-frame 2 when the sash wheel rolls on the sub-frame 2 during opening and closing of the roof window. The lifting arm 14 is also attached to the carriage guide 16 by an adjustment arm 52. The adjustment arm 52 is rotatably attached to the lifting arm 14 at one end. Figure 2 In the embodiment, the adjustment arm 52 is attached to the lifting arm 14 at a point that is approximately equal distance between the first end 12 of the lifting arm 14 and the second end 13 of the lifting arm. In other embodiments, the adjustment arm 52 may be rotatably attached to the lifting arm at a point closer to the first end 12 of the lifting arm 14 or a point closer to the second end 13 of the lifting arm 14. Figure 2 In the embodiment, the adjustment arm 52 is connected to the carriage guide 16 by the adjustment system 50 which will be described further below. In other embodiments, the adjustment arm 52 can be directly rotatably attached to the carriage guide.

[0061] The carriage 30 is attached to the spring assembly 20, which is arranged to apply a force to the carriage 30. Figure 3AAs detailed in , the carriage 30 can be disconnected from the spring assembly 20. As an example, this may be an advantage during the installation of a roof window, where the spring forces acting on the carriage 30 may make it difficult to maneuver the roof window. With the lifting device installed in the roof window according to its intended use, the carriage 30 and the spring assembly 20 are initially in a position such as Figure 3A The spring assembly 20 and the carriage 30 are then coupled by opening the roof window causing the carriage 30 to slide towards a coupling device, such as a hook attached to a spring included in the spring assembly 20. Figure 3B As shown in , opening the roof window causes the carriage 30 to engage with the hook, and once the roof window is subsequently closed, the carriage 30 will slide back in a direction away from the spring assembly 20, and the spring now coupled to the carriage 30 will apply tension to the carriage 30 and provide resistance to the closing of the roof window. The tension of the spring and the weight of the roof window are preferably balanced so that the roof window can be positioned in an open position without closing due to its own weight or opening further due to the tension from the spring in the spring assembly. This balance is also affected by the inclination of the roof on which the roof window is installed. The spring in the spring assembly 30 can be adjusted to balance the roof window in a specific roof inclination. If the roof window is installed in a roof with a roof inclination different from the expected inclination, the spring force acting on the carriage will not be balanced with the weight of the window. In one example, the spring may apply too much force to the window, forcing the window to open further. In another example, the spring may be too weak and the window will close due to its own weight. In both cases, the window is difficult for the user to operate and is potentially dangerous. To easily adjust the roof window to the roof pitch, use Figures 2 to 3B and Figures 6 to 11 In these embodiments, an adjustment system is installed to adjust the position of the second end of the adjustment arm 52 in the carriage guide 16. Alternatively, it is contemplated that the adjustment system 50 is instead installed in the lifting arm 14 so that the first end of the adjustment arm is attached to the lifting arm 14 by the adjustment system and the second end of the adjustment arm is attached to the carriage guide.

[0062] Adjustment arm rivet 57 - on Figure 3B As is better shown in FIG. 1 , the lifting arm 14 is securely connected to the adjustment arm 52 while enabling their rotational movement relative to each other.

[0063] Figure 4 The sash wheel 40 is shown in a wheel guide 41 , wherein the wheel guide 41 is provided with longitudinal flanges protruding from two longitudinal edges of the wheel guide, thereby forming a channel in which the sash wheel 40 can move. Figure 5An alternative embodiment of the lifting device 10 is shown, in which the wheel guide 41 is configured as a plate. Typically, the second end of the lifting arm may also include a flange surrounding the sash wheel or a portion of the sash wheel, such as Figure 5 as shown in .

[0064] Figure 6 and Figure 7 Each shows a part of a lifting device, wherein the lifting arm 14 extends upward and away from the carriage 30. In these embodiments, the lifting arm 14 comprises a first lifting arm 141 and a second lifting arm 142, wherein the two lifting arms 141, 142 are arranged on opposite sides of the adjusting arm 52. The two lifting arms 141, 142 are preferably similarly shaped so that both the sash wheel and the adjusting arm are arranged between the two lifting arms 141, 142. Figure 4 and Figure 5 The wheel rivet 42 shown in FIG. 4 can be used as a means for holding the two lifting arms 141, 142 fixed to each other. Other means can also be used to hold the two lifting arms 141, 142 fixed to each other. The two lifting arms 141, 142 can be fixed to each other by attaching to the adjustment arm 52 and by attaching to the carriage 30. Each of these means for fixing the two lifting arms to each other can be used in combination or alone. Figure 6 and Figure 7 As shown in FIG. 1 , the adjustment arm 52 includes a first adjustment arm 521 and a second adjustment arm 522. The two lifting arms 141 and 142 are symmetrically arranged relative to the central plane P, as shown in FIG. Fig. 9 Similarly, the two adjustment arms 521 and 522 are symmetrically arranged relative to the central plane P.

[0065] Figure 6 and Figure 7 A regulating system 50 is also shown. Figure 6 Specifically shown is an adjustment slot 55, with which the adjustment bushing 54 engages. In this embodiment, the adjustment slot 55 is a linear slit in the form of a track on the exterior of the carriage guide 16 that constrains the adjustment bushing 54 and, thereby, the adjustment arm 52 from traveling in a linear direction in the adjustment slot 55. The adjustment slot 55 may alternatively be slightly curved so that the adjustment arm 52 travels along a semicircle. The longitudinal direction of the adjustment slot 55 may additionally or alternatively be arranged in a direction that is substantially parallel to the sliding direction of the carriage. In other embodiments, the longitudinal direction of the adjustment slot 55 may travel in a direction perpendicular to the sliding direction of the carriage 30 in the carriage guide 16.

[0066] Figure 7 The carriage guide rivets 58 are shown for increasing the stability of the lifting device 10. The carriage guide rivets 58 lock the two sides of the carriage guide to each other and at the same time ensure that the lifting device 10 is also stable. Figure 7The adjustment system shown in remains in place.

[0067] Figure 8 The lifting device 10 for a roof window is shown in a top perspective view. It is clearly shown that in this embodiment, the first adjustment arm 521 and the second adjustment arm 522 are away from and separated from each other where they are attached to the adjustment system 50, but are attached to each other close to the point where they are attached to the adjustment system 50 and until they are attached to the lifting arms 141, 142. Alternatively, the adjustment arms 521, 522 may each have a longer inclined portion and a closer attachment point to the lifting arms.

[0068] Fig. 9 A perspective view of the lifting device in the open position is shown, wherein a center plane P is shown. The imaginary center plane P extends in the longitudinal and height directions and is defined as a plane in which the respective forces exerted by the lifting arms and the regulating arms are balanced. The center plane P intersects the carriage guide 16 in the middle of the width of the carriage guide 16. The width is defined as extending in the width direction, which is perpendicular to the length direction. Therefore, the two lifting arms 141, 142 are arranged symmetrically with respect to the center plane P. Similarly, the two regulating arms 521, 522 are arranged symmetrically with respect to the center plane P. The two lifting arms 141, 142 are positioned so that the forces exerted by the lifting arms 14 on the center plane P are balanced. Furthermore, the carriage guide 16 is symmetrical with respect to the center plane P. The lifting arms 14 include a first lifting arm 141 and a second lifting arm 142 which are arranged symmetrically with respect to the center plane P.

[0069] Fig.10 and Fig.11 The lifting device is shown in a side view. Fig.10 In the embodiment, the adjusting arm 52 is adjusted so that when the window is in the open position, its second end is in a position forming an angle α1 between the lifting arm 14 and the adjusting arm.

[0070] exist Fig.11 In the case of roof windows, Fig.10 The same open position is obtained, and the second end of the adjustment arm 52 is adjusted so that the angle between the adjustment arm 52 and the lifting arm 14 is an angle α2. Fig.11 In FIG. 5 , it can also be seen how the adjustment arm 52 can be adjusted by means of a machine tool 60, such as a drill bit that fits and rotates into an opening in the carriage guide 16 of the lifting device 10, as also shown in FIG. Figure 2 , Figure 3A , Figure 3B as shown in . Fig.10 The adjusting arm 52 shown in FIG. 1 is arranged for a roof window installed in a roof having a pitch of approximately 65°, while Fig.11The roof window shown in is arranged for a roof window installed in a roof with an inclination of approximately 15°. By adjusting the adjustment arm 52 to a position between these two extremes, the forces can be balanced for roof inclinations varying in the range of 15° to 65°. The adjustment system can also adjust the lifting device to operate smoothly in roof windows installed at lower or higher roof inclinations, such as 10° or 70°.

[0071] FIG. 12A to FIG. 12B An example of how a machine tool and an adjustment system may interact is shown. Fig. 12A , a machine tool 60 is shown fitted into the opening of the carriage guide 16. The machine tool 60 has a drill bit that fits to the adjustment screw 53. Fig. 12A It is shown how the adjustment bushing 52 may be fitted onto the adjustment screw 52 . Fig. 12A Also shown is how the adjustment bushing 52 fits into the adjustment slot 55. By turning the mechanical tool 60, shown as a drill in this embodiment, the adjustment screw 53 is turned. This causes the adjustment bushing 52 to move along the length of the adjustment screw 53 and also along the adjustment slot. Fig. 12A As can be seen, the adjustment slot 55 has an indication indicating for which roof pitch the adjustment system 50 is adjusted. Fig. 12A In the embodiment, the adjustment system 50 is adjusted to a roof inclination of approximately 15°. Fig. 12B In the embodiment, the adjustment system 50 is adjusted to a roof inclination of approximately 65°. Fig. 12B , it is shown how the adjustment arm 52 may be connected to the adjustment bushing 52 .

[0072] The present invention is not limited to the embodiments shown and described above, but various modifications and combinations are possible.

[0073] Reference numerals list

[0074] 1 Main frame

[0075] 2 sub-frames

[0076] 4 Panes

[0077] 4i Internal Pane Surface

[0078] 4e External pane surface

[0079] 10 Lifting device

[0080] 12 First end of lifting arm

[0081] 13 Second end of the lifting arm

[0082] 14 Lifting arm

[0083] 141 First lifting arm

[0084] 142 second lifting arm 16 carriage guide

[0085] 20 Spring assembly

[0086] 30 Slide

[0087] 31 Slide wheel

[0088] 40 Window Sash Wheel

[0089] 41 wheel guide

[0090] 42 round rivets

[0091] 50 adjustment system 52 adjustment arm

[0092] 521 first adjustment arm

[0093] 522 second adjustment arm 53 adjustment screw

[0094] 54 Adjustment bushing

[0095] 55 adjustment slot

[0096] 56 Adjustment base

[0097] 57 Adjustment arm rivet

[0098] 58 Slide guide rivets

[0099] 60 Mechanical tools

[0100] 100 Roof Windows

[0101] P Center plane

[0102] α1 angle

[0103] α2 angle

Claims

1. A roof window (100), characterized in that: The roof window (100) comprises: Fixed main frame (1), at least one subframe (2), and A lifting device (10), the lifting device (10) comprising a lifting arm (14) inserted between the main frame (1) and the at least one sub-frame (2), the lifting arm (14) having a first end (12) and a second end (13), the first end (12) being rotatably connected to a carriage (30), the carriage (30) being slidably connected to the main frame (1) in a carriage guide (16), the second end (13) being connected to the at least one sub-frame (2), the lifting device (10) further comprising a spring assembly (20) configured to be coupled to the carriage (30), The lifting device (10) further comprises an adjustment arm (52) having a first end rotatably connected to the lifting arm (14) and a second end rotatably connected to the carriage guide (16), Wherein, the second end of the lifting arm (14) is arranged to move translationally along the sub-frame (2).

2. The roof window (100) according to claim 1, characterized in that The at least one sub-frame is a window sash and / or an intermediate frame.

3. The roof window (100) according to claim 1, characterized in that: The second end of the lifting arm (14) and the sub-frame (2) have a roller connection via a sash wheel (40).

4. The roof window (100) according to claim 3, characterized in that The sash wheel (40) is configured to roll on a wheel guide (41) connected to the sub-frame (2) during an opening and / or closing movement of the roof window.

5. The roof window (100) according to claim 3, characterized in that: The lifting arm (14) is connected to the sash wheel (40) via a sash wheel rivet (42).

6. The roof window (100) according to claim 3, characterized in that: The sash wheel (40) comprises 25%-45% by volume of glass fibers.

7. The roof window (100) according to claim 4, characterized in that: The sash wheel (40) and / or the wheel guide (41) have matching serrations.

8. The roof window (100) according to claim 1, characterized in that: The adjustment arm (52) is rotatably connected to the carriage guide (16) via an adjustment system (50).

9. The roof window (100) according to claim 8, characterized in that The adjusting arm (52) and the lifting arm (14) are connected at an angle (α1), By adjusting the position of the second end of the adjusting arm (52) by means of the adjusting system (50), the angle (α1) becomes a second angle (α2).

10. The roof window (100) according to claim 9, characterized in that The adjustment system (50) comprises an adjustment screw (53).

11. The roof window (100) according to claim 10, characterized in that The adjustment system (50) further comprises an adjustment bushing (54), wherein the second end of the adjustment arm (52) is connected to the adjustment screw (53) via the adjustment bushing (54).

12. The roof window (100) according to claim 11, characterized in that The carriage guide (16) further includes an adjustment slot (55), wherein the adjustment system (50) is configured to be received in the adjustment slot (55).

13. The roof window (100) according to claim 12, characterized in that The adjustment bushing (54) is configured to engage with the adjustment groove (55).

14. The roof window (100) according to claim 8, characterized in that The carriage guide (16) includes an opening adapted to receive a machine tool.

15. The roof window (100) according to claim 14, characterized in that The machine tool is a drill bit fitted to the adjustment system (50).

16. The roof window (100) according to claim 1, characterized in that The roof window further comprises an insulating glass unit.

17. The roof window (100) according to claim 1, characterized in that The carriage (30) includes a carriage wheel (31) configured to roll on the carriage guide (16) and / or a travel member mounted on the carriage and configured to cooperate and / or engage with the carriage guide (16).

18. The roof window (100) according to claim 8, characterized in that The adjustment system (50) also includes an adjustment base (56) secured to the carriage guide (16).

19. The roof window (100) according to claim 3, characterized in that: The sash wheel (40) has a diameter of approximately 30 mm.

20. The roof window (100) according to claim 3, characterized in that The sash wheel (40) has one or more cavities.

21. The roof window (100) according to claim 3, characterized in that The sash wheel (40) is moulded.

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