CN111386376A

CN111386376A - Lifting device comprising a skid system shaft and roof window comprising such a lifting device

Info

Publication number: CN111386376A
Application number: CN201880075483.8A
Authority: CN
Inventors: 拉塞·温瑟·赫德; 耶斯佩尔·赖伯格
Original assignee: VKR Holding AS
Current assignee: VKR Holding AS
Priority date: 2017-11-24
Filing date: 2018-11-26
Publication date: 2020-07-07
Anticipated expiration: 2038-11-26
Also published as: EP3714123A1; WO2019101278A1; PL3714123T3; DK201770886A1; EP3714123B1; HUE057096T2; CN111386376B; ES2903169T3; DK180500B1

Abstract

A lifting device (10) intended for a roof window and which lifting device (10) comprises a lifting arm (14), a spring assembly (20) with a first coupling member and a skid system (30). The first end (12) of the lifting arm (14) is rotatably connected with the skid system (30) and the second end (13) is configured to be connected to another part of the roof window. According to the invention, the first end (12) of the lifting arm (14) is connected to the skid system (30) via a shaft (40) fixedly connected to the first end (12).

Description

Lifting device comprising a skid system shaft and roof window comprising such a lifting device

Technical Field

The present invention relates to a lifting device for a roof window, in particular for installation in an inclined roof surface, comprising: a lifting arm; a spring assembly having a first coupling member; and a sled system configured to be slidably connected to a portion of the roof window and comprising a sled and a second coupling member configured to mate with the first coupling member, wherein the first end of the lifting arm is rotatably connected with the sled system and the second end is configured to be connected to another portion of the roof window. The invention also relates to a roof window incorporating such a lifting device.

Background

In roof windows for installation in inclined roof surfaces operating wholly or partly about a top hinge axis, it is known to counterbalance the weight of at least part of the movable component by means of lifting means which are respectively inserted between a pair of associated side members of the fixed frame and the sash element and one end of which is pivotally connected with one of the side members, while the other end is hinged to a sliding seat displaceable along the other side member, said seat being biased in one direction by a tension spring so as to apply an outwardly directed pressure force to the sash element through the rod. The purpose of this arrangement is to facilitate opening of the window, and the dimensions may be selected so that the springs balance the top hinged frame in the desired open position.

The offset sliding seat of such lifting devices is mounted on and moves parallel to or along the side frame member or side window element. The sliding seat typically slides in a guide mounted on the respective sash or frame member. The spring means biasing the sliding seat are typically positioned parallel to the respective sash or frame member. During opening and closing of the window, the sliding seat slides in the guide, pushing the lifting arm connecting the sliding seat with the intermediate frame or sash member to or from the parallel position. Rotation of the lifting arm in the slide shoe about the axis requires means for connecting the two parts in a rotatable manner.

Lifting devices for roof windows using sliding seats are known and can be found for example in EP 2406448B 1 of the applicant, wherein a lifting device is described comprising: a biased slide shoe adapted to slide relative to a member of the openable structure; a lifting arm having two ends, one end adapted to be pivotally connected to a member of the structure and the other end associated with the slide shoe. Another example is found in EP1520951B1 of the applicant, wherein a slide arrangement is disclosed comprising a slide member having a slide shoe adapted to engage with a generally U-shaped track comprising a bottom wall, side walls and a front wall. The solutions disclosed in the above documents have in common that the sliding seat described therein is adapted to be connected to another member, such as a sash or a lifting arm, by means of a single hole. Although the object of providing an axis about which the further member may be connected to the sliding seat in a manner that enables a suitable rotation is achieved, the resulting connection is weak, i.e. does not provide the stability and durability required for a lifting device used in a roof window of the type described in the introduction; the weight of the sash is increasing, because modern sashes comprise additional elements providing a greater range of functions, and better thermal insulation properties require a greater amount of material to be included in the structure of the frame, glazing and sash. Furthermore, such a device for connecting a sliding seat to a lifting arm in a roof window lifting device results in the need to replace parts at a considerable frequency: individual rivets or other suitable parts such as bolts, screws or pins typically wear rapidly when subjected to the weight of the sash frame member, which parts also bear the weight of the window glass. In addition, in the case of frequent use of the lifting device, such parts are repeatedly subjected to forces such that the parts need to be maintained. Wear on the swivel connection results in the forces being transmitted to other components of the system, which cumulatively results in inconsistent sliding of the sliding seat and in the opening and closing of the roof window being inefficient and inaccurate. A further problem with this arrangement is that it does not provide a solution for easily removing and replacing used parts at the same time.

In view of this, a current challenge is to provide a roof window lifting device with a sliding device that is able to withstand the current load requirements while providing a durable smooth, accurate and efficient use while providing a solution for a convenient swivel connection replacement.

Disclosure of Invention

It is therefore an object of the present invention to provide a roof window lifting device wherein the sliding seat or sled system is provided with durable rotational connection means to the lifting arm, thereby providing a smooth sliding and thus a precise and efficient operation of the roof window lifting device.

This is achieved by a roof window lifting device of the kind mentioned in the introduction, which is further characterized in that the first end of the lifting arm is connected to the skid system via a shaft fixedly connected to said first end.

In case a shaft is used, the forces generated by the operation of the lifting device during opening and closing of the roof window can be maintained at least better due to the fact that the shaft is supported at more than one point. This force will be repeated with frequent operation of the roof window. The effect of the skid system on the lifting arm and the effect of the lifting arm on the skid system can be transferred more efficiently via the axle. Thus, the precision, efficiency and durability are significantly improved over the single rivet or other suitable rotary connection means contemplated in the prior art. In the context of the present application, the term "fixedly" should be interpreted in such a way that: the lifting arm is always connected to the shaft and thus to the skid system during operation and may therefore not be unintentionally released from engagement.

In a currently preferred embodiment, the fixed connection is provided by a form-fitting engagement between the first end of the lifting arm and the shaft, preferably by forming the first end as a closed part. This provides a mechanically simple but reliable connection.

In a preferred embodiment, the shaft is mounted in a skid system. By the lifting device of the invention comprising a skid accommodating the shaft, a better stability and an increased robustness of the entire skid system can be achieved, so that a smoother operation of the skid system can be obtained.

According to another embodiment, the shaft comprises an at least partly substantially circular outer periphery and two end faces. By the substantially circular outer circumference of the shaft of the lifting device, a smoother movement of the lifting arm about the rotation axis is obtained, thus enabling an overall more precise operation of the lifting device.

By "precise operation of the lifting device" is meant that the opposing fixed frame and the movable sash element are aligned in a substantially parallel manner, resulting in a close juxtaposition of said opposing members in the closed window position. This also means that a predictable amount of force is required for operation of the lifting device, since the bias of the tension spring is transferred to the lifting arm with reduced resistance.

Furthermore, by making the outer circular surface of the shaft appear to be directly connected with the lifting arm, and in the absence of other coatings that may prematurely wear, it is possible to obtain greater durability of the lifting device shaft. In a further embodiment, a shaft is considered which has a partially non-circular cross section, in particular on the end of the shaft, wherein at least a width sufficient to receive the lifting arm width is circular. Such an embodiment provides the advantage of inserting the shaft end into a complementary non-circular hole in the skid wall portion, which reduces the chance of accidental rotation of the shaft in the skid wall portion.

According to another preferred embodiment, the shaft is fixed in the skid wall part and the lifting arm is free to rotate around the shaft. The fixed nature of the shaft in the skid wall portion ensures greater overall skid system stability. Furthermore, if the shaft is fixed in the wall part, it is easier to ensure the lateral position of the shaft in the skid wall part. However, another embodiment is also contemplated in which the shaft is fixed in the lifting arm and rotates in the skid wall portion.

According to another embodiment, wherein the slider is provided, the shaft is adapted to further contact at least one cut-out in the slider wall. The cutouts facilitate direct insertion of the shaft into the skid system during assembly. In addition, the cut-out edge may extend circumferentially along the edge of the shaft end face, thereby providing further support and stabilization means for the shaft. By "stable" it is meant that the cut-out edge will help to hold the shaft in place by reducing the likelihood of the shaft being displaced laterally within the skid wall portion.

Similarly, in a further embodiment in which a slide is provided, the shaft is adapted to further contact at least one bowl portion in the skid or slide. The shaft is adapted to contact the bowl portion which provides further support for the shaft and helps to maintain the forces generated during operation of the lifting device and the forces transferred between the skid system and the lifting arm via the shaft.

In another preferred embodiment, the shaft has at least one end with a pattern. The knurled end portion is adapted to be inserted into at least one hole in the at least one skid wall portion. By such an end, the shaft can be inserted into the hole more easily, thereby making assembly easier. Additionally, such a knurled end helps secure the axle in the hole of the skid system wall, thereby making the axle more secure. By "textured" is meant any arrangement that results in a matte surface that is present on the outer circumference of the shaft.

In a second aspect of the invention, a roof window incorporating such a lifting device is provided.

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

Drawings

In the following description, embodiments of the invention will be described with reference to the schematic drawings, in which

Fig. 1 is a perspective view of a roof window seen from the inside and in an open position;

fig. 2 is a perspective view of a detail of the roof window with a lifting device in a first embodiment of the invention and corresponding to the open position of the roof window of fig. 1;

fig. 3 is an isometric view of a detail of the roof window of fig. 2, in the closed position of the window.

FIG. 4 is a partially exploded view of a detail of FIG. 3;

FIG. 5 is an isometric view of the spring assembly shown in FIG. 3;

FIG. 6 is an enlarged, partial isometric view of the spring assembly shown in FIG. 5;

FIG. 7 is a partially exploded isometric view of some of the elements of FIG. 6;

figures 8a to 8e are isometric views of the elements of figure 7;

FIG. 9a is an enlarged partial isometric view of the detail shown in FIG. 3;

FIG. 9b is an exploded partial perspective view of a detail of a lifting device in another embodiment of the present invention;

figures 10 and 11 are partial isometric views of a detail of a lifting device of a roof window in a second embodiment of the invention;

fig. 12a to 12h are schematic partial side views of an embodiment of the roof window of the invention during coupling and uncoupling of the lifting device;

figures 13a to 13b, 14a to 14b and 15a to 15b are perspective views of details of a roof window in a second embodiment;

fig. 16 shows a schematic perspective view of a detail of a roof window in a third embodiment of the invention;

fig. 17 shows a schematic side view of a detail of a roof window in a further embodiment of the invention;

fig. 18a to 18e are views of a detail of the roof window in the third embodiment, corresponding to fig. 8a to 8e, respectively;

fig. 19 a-19 b are views of a detail of the roof window in the third embodiment, corresponding to fig. 13 a-13 b, respectively;

fig. 20a is a view corresponding to fig. 14a of a detail of a roof window in a third embodiment;

fig. 20b is a partial perspective view of a detail of the roof window in the third embodiment; and

fig. 21 to 24 show a partial or full view, an exploded view or a sectional view of a detail of a roof window in a further embodiment of the invention.

Detailed Description

Referring first to fig. 1, the general configuration of a roof window that is top hinged and pivoted for cleaning during normal operation is shown. Such a window is shown and described in more detail in applicant's above-mentioned european patent No. 0733146B1, the contents of which are incorporated herein by reference. In fig. 1a lifting device 10 is shown, and now also referring to fig. 2-9, the lifting device forms part of a first embodiment of a roof window according to the invention.

The roof window comprises a main frame in the form of a fixed frame 1 which is configured for mounting in an inclined roof surface. At least one sub-frame is connected to the fixed frame 1, in the embodiment shown a first sub-frame in the form of a sash 2 carrying a pane 4 and a second sub-frame in the form of an intermediate frame 3. The intermediate frame 3 is fastened to the fixed frame at the top mounting fitting 5 and the sash 2 is hinged to the fixed frame 1 via the intermediate frame 3 at the top of the roof window in order to hang the roof window up during normal operation. The sash 2 is also pivotally connected to the intermediate frame 3 so as to enable rotation of the sash 2 to provide access to the outside of the glazing 4, for example for cleaning purposes. For this purpose the intermediate frame 3 is provided with a frame hinge part 6 of a pivoting hinge fitting. Although not shown in detail, it is clear to the skilled person that the sash 2 is provided with a counterpart sash hinge part of the pivot hinge fitting.

Lifting device 10 includes a spring mechanism 20 and a skid system 30, spring mechanism 20 and skid system 30 cooperating to assist in opening the window, i.e., bringing one or more sub-frames into an angled position relative to the main frame. Here, the user operates the operating means of the window in the form of a handle 7 at the bottom member of the sash 2 from the closed position. The biasing of the spring mechanism 20 of the lifting device 10 acts on the lifting arm 14 which is inserted between the fixed frame 1 and the intermediate frame 3. In turn, the lifting arm 14 applies a moment to the intermediate frame 3 and hence to the window sash, relative to an axis passing through the top hinge pin 11. In combination with the force exerted by the user on the handle 7, which is converted into a lifting moment, the moment generated by the weight of the sash 2 and the pane 4 is overcome. Closing the window from the open position requires a reverse movement of the sash 2 and the relevant parts of the lifting device 10. Similar lifting means may be provided at each side of the roof window. Finally, the roof window is provided with ventilation means 8 for allowing air to pass also in the closed position of the window.

In more detail, the lifting arm 14 has a first end 12 rotatably connected with a skid system 30, the skid system 30 in turn slidably connected with the main frame 1 in a skid guide 16, and a second end 13 rotatably connected with at least one sub-frame 3, the lifting device 10 further comprising a spring assembly 20, the spring assembly 20 configured to be coupled to the skid system 30. Since skid system 30 is connected to lift arm 14, spring assembly 20 is in turn configured to be connected to first end 12 of lift arm 14 by way of a coupling mechanism such that spring assembly 20 can be in an uncoupled state and a coupled state relative to skid system 30. The coupling mechanism is the subject of applicant's co-pending patent application filed on the same day as the present invention. The operation of the presently preferred embodiment is described in detail in connection with fig. 12a to 12h of the applicant's co-pending international application filed on the same date as the present application and claiming priority to DK PA 201770889, to which particular reference is hereby made.

Fig. 5 and 6 show the general components of the spring assembly 20 of the roof window. Further details and advantages of the particular spring assembly 20 are the subject of a co-pending patent application filed on the same day as the present application and are shown in fig. 21-24 for reference purposes only. However, the present invention can be applied to any type of spring assembly. Thus, the common components of the spring assembly are: a pull rod 22 housing a damping spring system 28 and a main spring system 29. The damping spring system 28 serves as an auxiliary system for the main spring system 29. In order to adapt the same spring assembly to different roof inclinations, an adjustment device in the form of a movable adjustment plate 26 is provided, which is placed in one of several recesses 27a of a spring housing 27 accommodating a damping spring system 28.

Referring now in particular to fig. 10 to 11, 13a to 13b and 15a, as best shown in fig. 6, the coupling mechanism comprises a first coupling member 21 associated with the spring assembly 20.

First coupling member 21 is adapted to mate with a second coupling member associated with skid system 30. In the first, second and third embodiments shown in fig. 10-11, 13 a-15 b and 18 a-20 b, the second coupling member comprises a skid 31 forming part of the skid system 30, and the skid 31 comprises receiving means configured to cooperate with the first coupling member 21 in the coupled state.

In all the embodiments shown, the first coupling member comprises a hook element 21 to cooperate with the second coupling member comprising a receiving means of this hook element formed in the skid system 30, in the second coupling member of the coupling mechanism comprising the skid 31 of the skid system 30. The hook element 21 is configured to have at least an unengaged position and an engaged position, and the coupling mechanism further comprises a coupling plate 25, the coupling plate 25 being arranged to have at least a first position corresponding to the coupled state and a second position corresponding to the uncoupled state, the coupling plate 25 allowing the hook element 21 to be in said unengaged position. The operation of the presently preferred embodiment will be described in further detail in connection with fig. 12a to 12 h.

The receiving means of the second coupling member comprises at least one receiving recess 314 in the skid 31 of the skid system 30. Other shapes for the second coupling member are also possible. One conceivable alternative solution would be to use the shaft 40 as a receiving means. This alternative solution is shown in a fourth embodiment shown in fig. 20.

Further details of the shaft 40 will now be described in more detail with reference to fig. 10 and 15a to 15b, 16 and 20 b.

Fig. 10 shows the axle of the present invention installed in a skid system, connecting both lift arm 14 and skid system 30. The shaft 40 comprises an at least partly substantially circular outer periphery and two end faces. In a preferred embodiment, the shaft has a circular outer periphery and is therefore arranged to be inserted into a hole having a circumference in the wall of the skid 31 while rotatably receiving the lifting arm end 12. The circular periphery enables the lifting arm to be rotatably attached. Thus, the portion of the shaft presenting a circular outer periphery should be at least wide enough to accommodate the lifting arm end 12. The end of the shaft needs in any case to be arranged for easy insertion into said hole in the wall of skid 30, which hole should be arranged to complementarily receive said shaft end.

In the illustrated embodiment, the shaft end has a circular periphery and the hole in the wall of skid 30 also has a circular periphery, but the shaft end and hole may have any other peripheral shape, such as triangular, square, pentagonal, etc., or an irregular shape. In any event, the peripheral shapes with respect to the shaft and the skid wall portion should correspond to each other.

In principle, the configuration of the shaft 40 in the skid 31 or the skid system 32 may be carried out in any suitable manner as long as it meets the requirements caused by the relatively large forces involved.

Turning now to a more detailed representation in fig. 17, the shaft 40 is arranged such that there is a gap between at least one end face of the shaft 40 and the guide 16. In the illustrated figures, this gap is achieved by making the shaft shorter than the width of the slider 32, thereby creating a gap between the shaft 40 and the portion that may contact the slider 32. In the illustrated image, the space created is equally divided between the two axial end faces, creating a gap at both ends of the shaft 40. In any case, it is intended that the shaft 40 is not in direct contact with the fixed frame 1 or the guides 16 (if present).

Slider 32 receives a skid 31, and skid 31 receives shaft 40 through a hole in the skid wall. The slider and sled collectively form a sled system that is connected to the spring assembly via a coupling mechanism as shown in fig. 12 d. The bias of the spring assembly 20 of the lifting device 10 acts on the lifting arm 14 inserted between the fixed frame 1 and the intermediate frame 3 by torque transmission between one or more of the springs in the spring assembly and the skid 31 via the coupling mechanism, which forces the skid system to slide and transmit torque to the lifting arm via the axle, as shown in fig. 12 c. The shaft of the present invention is arranged to maintain and effectively transmit these relatively large forces. To this end, as shown in fig. 17, the shaft is arranged to contact the bowl portion in the skid 31 or the slide 32, as appropriate. The bowl portion is arranged to receive the shaft and thereby partially transfer the strain exerted by the lifting arm to the skid system, thereby supporting the shaft. In the shown figures the bowl is arranged to provide sufficient space between the bowl and the skid for accommodating the lifting arm end 12 in the space. In any case, it is known to the skilled person that the shaft of the present invention is arranged to contact the bowl-shaped part in a manner that effectively supports the shaft.

Also in fig. 15a, the shaft 40 is arranged to contact at least one cut-out 325, 326 in the

wall portion

321, 322 of the slider 32. The cut-out edge may be arranged to extend circumferentially along the edge of the shaft end face to provide further support to the shaft and to help hold the shaft in place by reducing the likelihood of the shaft being displaced laterally within the wall of skid 31.

The arrangement shown in fig. 15a provides a robust and compact assembly having an axle arranged to maintain the force transmitted by the spring assembly and lifting arm 14 to the skid system. For this purpose, the shaft 40 is inserted into the skid wall part such that in the mounted state the shaft is fixed under the force normally generated by the operation of the roof window lifting device. Fig. 18 shows axle 40 of the present invention, with axle 40 having a textured end 401 which when inserted into one of the

walls

315, 316 of skid 31 secures the axle in skid system 30. By "fixed" it is meant that under normal use of the lifting device, the knurled end 401 of the shaft 40 will significantly reduce the likelihood of the shaft rotating within the

holes

315, 316 of the skid wall portion and/or moving along the axis of the shaft. The knurled end 401 provides a reduced contact surface between the shaft 40 and the inner surface of the

holes

315, 316 of the skid wall portion, thereby enabling the shaft to be inserted forcefully into the holes and, with it, increasing the friction between the two parts. The drawings of fig. 10 and 11 show the shaft 40 having a patterned end, but any arrangement that provides increased friction between the outer surface of the shaft and the bore of the skid wall portion is also contemplated. Finally, the skid 31 is provided with a second opening 318 and a cut-out 319 to make room for other components of the lifting device 10.

In the third embodiment of the roof window shown in fig. 19 a-19 b, the skid 31 is made longer than the skids of the first and second embodiments. This provides greater strength to skid 31. Thus, the incision 319 is made longer.

At least one

shaft end

401, 402 may include locating marks 404. Such locating marks require corresponding fiducials 403 on the skid wall or slide so that sufficient deformation of the material can be detected during installation of the shaft 40 in the skid 31. A preferred way of achieving this is by mounting the shaft in a hole in the skid wall portion such that a corresponding locating mark on the end face of the shaft is substantially aligned with the datum.

The description of skid system 30 is given for reference purposes only and is the subject of applicant's co-pending patent application filed on the same day as the present application. To more precisely control frictional forces as skid system 30 moves within skid guide 16, skid system 30 of the present invention includes a slider 32, slider 32 being configured to receive skid 31 and being provided with at least one recess 324 opposite a corresponding receiving recess 314 in skid 31.

The skid system 30 of the slider 32 includes: a slider 32, the slider 32 having at least two faces, a slider inner face and a slider outer face; and a skid 31, the skid 31 having at least two faces, a skid inner face and a skid outer face, the slide 32 comprising at least one

wall

321, 322 and the slide 32 being configured to receive the skid 31 in such a way that the skid 31 abuts against said slide inner face of the slide 32, and wherein said slide 32 is provided with at least one recess 324 opposite to the corresponding receiving recess 314 in said skid 31.

In the illustrated embodiment, the slide 32 is guided in the skid guide 16. Alternatively, the slider 32 may be guided directly in the main frame 1.

In addition, skid 31 and/or slide 32 may include means for reducing movement between the slide inner surface and the skid outer surface. In the illustrated embodiment, the means for reducing movement between the inner surface of the slider and the outer surface of the skid comprises a resilient upstanding portion 327 in the slider 32 and a corresponding opening 317 in the skid 31 opposite the resilient upstanding portion 327.

In the illustrated embodiment, another means for reducing movement between the slider inner surface and the sled outer surface includes at least one flange on at least one

slider wall portion

321, 322, the at least one flange being arranged to abut the sled 31.

As shown, at least a portion of one of the

slider wall portions

321, 322 is thinner than the

other wall portion

321, 322, and the

first collar portion

321a, 322a is thinner than the

second collar portion

321a, 322 a.

Skid 31 also includes at least one constriction 313, constriction 313 being created by at least one section of one of

wall portions

311, 312 being non-parallel with respect to the

other wall portion

311, 312. In this manner, a gap is created between the skid wall portion and the frame member or guide.

In the illustrated embodiment, the slide 32 further includes a bowl portion 323 arranged to receive the shaft 40, and the skid 31 includes a corresponding opening 317 opposite the bowl portion 323. The bowl portion 323 and the opening 317 are arranged such that the distance between the bowl portion 323 and the sled first wall portion 311 is greater than the distance between the bowl portion 323 and the sled second wall portion 312.

The slide 32 further comprises at least one cut-out 325, 326 in at least one

wall

321, 322 arranged to receive the shaft 40.

Here, the slider 32 further includes an edge portion 328 as a cutout on at least one end.

In the illustrated embodiment, the slider 32 is formed from a plastic material such as POMThe plastic may also be provided with, for example

Or other treatment layer having the function of acting as a lubricant to reduce friction.

The constriction 313 on the slide 32 is produced for reasons of space availability. By forming the slide to be slimmer on one side, 322a can be made thicker and provide a tolerance on the side where 322 is located-in this way the shaft 40 is guided so that the end 402 does not protrude to the extent that it causes wear to the sides of the guide.

The edge portion 328 is provided as a cut-out to allow room for the rest of the assembly. The flange portion 329 scrapes the guide to the side of the guide.

In general, the components of the lifting device are subjected to high loads, especially in case of large roof windows and low roof inclinations. In such application areas, the lifting capacity required for the lifting device may amount to approximately 500 Nm. Such large loads not only place severe demands on the components, but also require high performance spring assemblies.

In addition to the aspects covered by the present application, precautions are taken to mitigate the adverse effects of loads in the top hinge pin 11 and top support fitting 15. In order to keep the top hinge pin 11 safely secured in the top bearing fitting 15 at all times, the top hinge pin 11 is formed with a head and is fastened against rotation. In order to safely transfer the load exerted by the sash on the top hinge pin 11 via the intermediate frame to the top support fitting 15, the top support fitting 15 is provided with a protrusion (not shown in detail).

The invention has been described above with reference to a sash and a frame of a roof window, but it will be appreciated that the invention is also applicable to other frame structural members, such as for example a door frame.

List of reference numerals:

1 Main frame (fixed frame)

2 first subframe (Window sash)

3 second subframe (middle frame)

4 window glass

5 Top mount fitting

6 frame hinge part of a pivoting hinge fitting

7 handle

8 ventilating device

10 lifting device

11 hinge pin

12 first end of lifting arm

13 second end of lifting arm

14 lifting arm

15 Top support fitting

16 skid guide

20 spring assembly

21 first coupling member/hook element

210 tip

211 orifice

212 substrate portion

213 Flange portion

214 hook portion

215 rounded transition edge portion

216 inclined edge portion

217 Top portion

217a recess in the top portion

218 bottom edge portion

219 inclined edge part

22 draw bar

221 shank portion

222 head portion

223 first inclined portion

224 second inclined portion

225 adjusting ring

23 corner element

231 orifice

231a enlarged orifice section

232 upright leg

233 bottom leg

234 projecting flange

235 gap

24 end piece

241 aperture

242 upstanding wall

243 projecting part

244 projecting flange

244a rib portion

245 track

246 bent flange portion

25 connecting plate

251 rectangular opening

252 base portion

253 bottom flange

254 cut

255 vertical leg

256 friction increasing part

26 adjusting plate

27 spring housing

27a recess for adjusting the plate

28 buffer spring system

281 external spring

282 inner spring

283 spring plug

284 spring plug

29 main spring system

291 spring

292 spacer tube

30 skid system

31 second coupling member/skid

310 bottom part

311 first wall part

312 second wall part

313 narrowing part

314 receiving recess

315 hole

316 hole

317 first opening

318 second opening

319 incision

32 sliding part

320 bottom part

321 first wall part

321a first collar segment

322 second wall portion

322a second collar section

323 bowl-shaped part

324 concave part

325 cut

326 incision

327 resilient upstanding portion

328 edge portion

329 flange part

40 shaft

401 patterned end

402 another end portion

403 mark

404 positioning mark

50 friction braking device

51 Friction braking element

52 first taper part

53 second cone part

54 spring plug

Claims

1. Lifting device (10) for a roof window, in particular for installation in an inclined roof surface, the lifting device (10) comprising:

a lifting arm (14);

a spring assembly (20), the spring assembly (20) having a first coupling member; and

a sled system (30), the sled system (30) configured to be slidably connected to a portion of the roof window and comprising a sled (31) and a second coupling member configured to mate with the first coupling member,

wherein a first end (12) of the lifting arm (14) is rotatably connected with the skid system (30) and a second end (13) is configured to be connected to another part of the roof window,

it is characterized in that the preparation method is characterized in that,

the first end (12) of the lifting arm (14) is connected to the skid system (30) via a shaft (40) fixedly connected to the first end (12).

2. The roof window lifting device according to claim 1, wherein the fixed connection is provided by a form-fitting engagement between the first end (12) of the lifting arm (14) and the shaft (40), preferably by forming the first end (12) as a closed part.

3. A roof window lifting device according to claim 1 or 2, wherein the shaft (40) is mounted in the skid system (30).

4. A roof window lifting device according to any of the preceding claims, wherein the shaft (40) comprises an at least partly substantially circular periphery and two end faces.

5. A roof window lifting device according to any of the preceding claims, wherein the lifting device (10) further comprises a guide (16) and the shaft (40) is arranged such that there is a gap between at least one end surface of the shaft (40) and the guide (16).

6. A roof window lifting device according to any of claims 4 and 5, wherein the axle (40) contacts the sled system (30) through at least one receiving hole (315, 316) in at least one sled wall part (311, 312) of the sled (31).

7. The roof window lifting device according to claim 6, wherein the skid system (30) further comprises a slide (32) and the shaft (40) further contacts at least one cut-out (325, 326) in a wall portion (321, 322) of the slide (32).

8. A roof window lifting device according to claim 6 or 7, wherein the shaft (40) is received in at least one bowl part (323) in the skid (31) or the slide (32), the skid (31) comprising a corresponding opening (318) opposite the bowl part (323).

9. A roof window lifting device according to any of the preceding claims, wherein the shaft (40) has at least one knurled end for insertion into the at least one hole (315, 316) in the at least one skid wall portion (311, 312).

10. A roof window lifting device according to any of the preceding claims, wherein the shaft (40) comprises at least one positioning mark (404), and wherein the skid (31) and/or the slide (32) comprises at least one corresponding positioning mark positioned opposite the at least one positioning mark (404) on the shaft.

11. A roof window lifting arrangement according to any of the preceding claims, wherein the shaft (40) constitutes the second coupling member.

12. A roof window, in particular for installation in an inclined roof surface, comprising: a main frame (1); at least one sub-frame (2, 3), such as a sash (2) and/or a middle frame (3); and at least one lifting device (10) according to any one of claims 1-10, wherein the lifting arm (14) is interposed between the main frame (1) and the at least one sub-frame (2, 3), the lifting arm (14) having a first end (12) and a second end (13), the first end (12) being rotatably connected with the skid system (30), the skid system (30) being slidably connected with the main frame (1), the second end (13) being rotatably connected with the at least one sub-frame (3).