ES2893575T3 - Roof window with primary frame and at least one secondary frame, method of installing such a roof window and method of removing a secondary frame from the roof window - Google Patents

Abstract

A roof window, in particular for installation on a sloping roof surface, comprising a primary frame (1), at least one secondary frame (2, 3), such as a sash (2) and/or a frame (3 ) intermediate, and a lifting device (10) including a lifting arm (14) inserted between the primary frame (1) and the at least one secondary frame (2, 3), a sled system (30) and a coupling mechanism, the lifting arm (14) having a first end (12) rotatably connected with the sled system (30) slidably connected with the primary frame (1) in a sled guide (16) and a second end (13) rotatably connected to the at least one secondary frame (3), the lifting device (10) further including a spring assembly (20) configured to engage the sled system (30) and to the first end (12) of the lift arm (14) via the coupling mechanism, so that the spring assembly (20) can as In a disengaged condition and a coupled condition with respect to the sled system (30), the coupling mechanism comprises a first coupling member (21) associated with the spring assembly (20) and adapted to cooperate with a second member (21). coupling 31) associated with the sled system (30), and the first coupling member including a hook element (21) and the second coupling member including receiving means formed on the sled system (30) and configured to cooperate with said hook element (21) in the engaged condition, and the hook element (21) being configured to assume at least one non-engaging position and one engaging position, wherein the coupling mechanism further comprises a coupling plate (25) arranged to assume at least a first position corresponding to the coupled condition and a second position corresponding to the uncoupled condition, the coupling plate (25) which allows the hook element (21) to assume said non-engaging position, wherein the hook element (21) of the first coupling member has at least one hook portion (214) facing the sled system (30) , the hook element (21) having a U-shaped configuration including a base plate portion (212) and two flange portions (213), the at least one hook portion (214) being provided on one side. or each of the flange portions (213), wherein the spring assembly (20) comprises a tension bar (22) including a bar portion (221) extending substantially along the length of the assembly (20), and a head part 222 facing the hook element (21), the tension bar (22) is provided with at least one inclined part (223, 224) at the transition between the part 222 head and bar part (221), wherein the hook element (21) is provided with an opening (211) in the pl part (212) base to allow the passage of the tension bar (22) so that the head portion 222 of the tension bar (22) is retained within the U-shape on the front side of the head portion (212). base plate and the bar part (221) on the rear side, wherein the coupling plate (25) of the coupling mechanism has a base part (252) located on the rear side of the plate part (212). base of the hook element (21) and is provided with an oblong opening (251) to allow the passage of the bar part (221) of the tension bar (22), and where the coupling plate (25) can be slid in the plane of the base part (252) substantially perpendicular to the bar part (221) so that when in the first or bottom position, the hook part (21) is able to assume its resting position. hooking, and in the second or upper position, the hook part (21) remains in its non-hooking position, and where the hooking plate (25) The mounting is provided with a lower flange (253) formed on the base portion (252) to rest on the at least one inclined portion (223) in the non-engaging position.

Description

DESCRIPTION

Roof window with primary frame and at least one secondary frame, method of installing such a roof window and method of removing a secondary frame from the roof window

technical field

The present invention relates to a roof window, particularly for installation on a sloped roof surface, comprising a primary frame, at least one secondary frame, such as a sash and/or an intermediate frame, and a lifting device that includes a lift arm inserted between the primary frame and the at least one secondary frame, the lift arm having a first end rotatably connected with a sled system slidably connected with the primary frame on a sled guide and a second end rotatably connected to the at least one secondary frame, the lifting device further including a spring assembly configured to couple to the sled system and the first end of the lifting arm by means of a coupling mechanism, of so that the spring assembly can assume an uncoupled condition and a coupled condition with respect to the sled system, the coupling mechanism which e comprises a first coupling member associated with the spring assembly and adapted to cooperate with a second coupling member also associated with the sled system, the first coupling member including a hook element and the second coupling member including receiving means formed on the sled system and configured to cooperate with said hook element in the engaged condition, or vice versa, wherein the hook element is configured to assume at least one non-engaging position and one engaging position. The invention further relates to a method of installing such a roof window and to a method of removing a secondary frame from the roof window.

Background art

Windows for installation on a sloped roof surface include the pivot type hinged at or near the center, the top hinged type, and finally roof windows that are hinged at the top during operation. normal but that pivot for cleaning. Examples of top-hung windows that pivot for cleaning are described, for example, in Applicant's WO-A-89/10460, EP 0 733 146 B1, EP 1873 323 B1 and EP 2 762 665 A2. In order to make it possible to pivot the window sash approximately 180° into a convenient cleaning position, the sash structure is connected with an intermediate frame with frame arms, which in the closed position of the window are placed between the upper parts of the window. frame and sheet. the side members, and which during normal use of the window as a top hung window follow the side members of the sash.

In roof windows where operation is wholly or partially around a hinge axis at the top, it is known to balance at least part of the weight of the moving components by means of a lifting device inserted between a pair of side members associated parts of the fixed frame and the sash element, respectively, and having one end pivotally connected to one of the side members while its other end is hinged to a sliding shoe movable along the other side member, said shoe being pushed by a tension spring in one direction to exert outwardly directed pressure through the lever on the blade element. The purpose of this arrangement is to facilitate opening of the window, and the dimensions can be chosen such that the spring can retain the top-hinged frame in balance in a desired opening position.

Coupling and uncoupling of such a window spring assembly is known from e.g. eg of European patent 0 081 333 B1, in which one end of the sash lifting lever has at least two pivot points having different distances from the pivot point at the other end of the lever, and which are located to enter into function successively during the opening of the window and successively increase the effective length of the lever. Another disclosure is found in WO 89/010460 A1, where a sliding shoe and a prestressed spring are described as having coupling means adapted to engage each other during window installation. Said coupling means include a tie rod connected at one end to said spring and to a coupling element at the other end. The coupling element engages a receiving recess in the slider shoe by means of a cross pin. However, this window requires the installer to lift the entire weight of the sash with one hand while the other hand is placed in a potentially dangerous position between the sash and the frame during installation and removal. Furthermore, window sashes are progressively gaining weight as modern sashes include additional elements that offer a greater range of functionality, and better insulation properties require more materials to be included in the construction of frames, glazing and leaves.

With this in mind, it is currently a challenge to provide a spring assembly and sled system coupling mechanism that can withstand today's load requirements while offering an intuitive and easily operable roof window that simplifies installation and removal.

Summary of the invention

Therefore, the object of the invention is to provide a roof window in which the secondary frame is installed and easily disassemble.

This is achieved with a roof window according to claim 1.

Thus, it is possible to engage and disengage the spring assembly from the sled system by manually placing the engagement plate in the selected position and opening and closing the blade to release or engage the first engagement member. The coupling plate remains in the selected position until its reactivation, this allows the installation or removal of the sash and/or intermediate frame in the fixed frame, since the first coupling member is free from its coupling with the sled system and , therefore, without interference from the thrust of the spring assembly.

According to the invention, the hook element of the first coupling member has at least one hook portion facing the sled system. This is especially advantageous from an installation point of view.

In another presently preferred embodiment, the hook element of the first coupling member is arranged to slideably engage the sled system in one direction and to engage said second coupling member in another direction. As well as being simple in installation and removal, this also provides logical operation.

In a second aspect of the invention, a method of installing a roof window is provided.

In a third aspect of the invention, a method of removing a roof window secondary frame is provided.

Other preferred embodiments of the invention are set out in the dependent claims.

Brief description of the 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 details of a 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 the details of the roof window of Fig. 2, in a closed position of the window.

Fig. 4 is a partially exploded view of the details 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 partial exploded isometric view of some elements of Fig. 6;

Figs. 8a to 8e are isometric views of the elements of Fig. 7;

Fig. 9a is an enlarged partial isometric view of the details shown in Fig. 3;

Fig. 9b is a partial exploded perspective view of details of the lifting device in another embodiment of the invention.

Figs. 10 and 11 are partial isometric views of details of the roof window lifting device in a second embodiment of the invention;

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

Figs. 13a-13b, 14a-14b and 15a-15b are detail perspective views of the roof window in the second embodiment;

Fig. 16 shows a schematic perspective view of details of a roof window in a further embodiment of the invention;

Fig. 17 shows a schematic detail side view of a roof window in yet another embodiment of the invention;

Figs. 18a-18e are views corresponding to Figs. 8a-8e, respectively, of roof window details in a third embodiment.

Figs. 19a-19b are views corresponding to Figs. 13a-13b, respectively, of details of the roof window in the third embodiment.

Fig. 20a is a view corresponding to Fig. 14a of details of the roof window in the third embodiment.

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

Figs. 21 to 24 show partial or total views, exploded or in sectional views of a roof window in yet another embodiment of the invention.

Description of achievements

Referring initially to Fig. 1, the general configuration of a roof window is shown as hinged at the top during normal operation and pivoted for cleaning. Said window is shown and described in more detail in the aforementioned applicant's document. European patent no. 0733146 B1, the contents of which are incorporated herein by reference. In Fig. 1, a lifting device 10 is indicated, which, with reference now also to Figs. 2 to 9a, forms part of a first embodiment of the roof window according to the present invention.

The roof window comprises a primary frame in the form of a fixed frame 1 configured for installation on a sloped roof surface. At least one secondary frame is connected to the fixed frame 1, in the embodiment shown a first secondary frame in the form of a sheet 2 carrying a glass 4, and a second secondary frame in the form of an intermediate frame 3. Intermediate frame 3 is attached to the fixed frame at a top mount fixture 5, and sash 2 is hinged at the top of the roof window, through intermediate frame 3 to fixed frame 1, to leave the roof window hanging at the top during normal operation. The sash 2 is also pivotally connected to the intermediate frame 3 so that the sash 2 can be rotated to provide access to the outside of the glass 4, for example for cleaning purposes. To that end, the intermediate frame 3 is provided with a frame hinge portion 6 of the pivot hinge attachment. Although not shown in detail, it is clear to the person skilled in the art that the leaf 2 is provided with the equivalent leaf hinge part of the pivot hinge attachment.

A lifting device 10 is comprised of a spring arrangement 20 and a sled system 30 which cooperate to assist in opening the window, ie bringing the secondary frame(s) into an angled position relative to the primary frame. Here, from a closed position, the user actuates the handle-shaped window operating device 7 on the lower sash member 2. The thrust of the spring arrangement 20 of the lifting device 10 acts on a lifting arm 14 . elevation inserted between frame 1 fixed and frame 3 intermediate. In turn, the lifting arm 14 exerts a moment on the intermediate frame 3 and therefore on the sash with respect to an axis through an upper hinge pin 11. In combination with the force exerted by the user on the handle 7, translated into a lifting moment, the moment resulting from the weight of the sash 2 with the glass 4 is overcome. Closing the window from the open position involves the opposite movements of the sheet 2 and relevant parts of the lifting device 10. A similar lifting device can be provided on each side of the roof window. Finally, the roof window is provided with a ventilation device 8 which acts to allow the passage of air also in the closed position of the window.

In greater detail, the lifting arm 14 has a first end 12 rotatably connected to a sled system 30, which in turn is slidably connected to the primary frame 1 on a sled guide 16, and a second end 13 rotatably connected to the at least one secondary frame 3, the lifting device 10 further includes a spring assembly 20 configured to couple to the sled system 30 . As the sled system 30 is connected to the lift arm 14, the spring assembly 20 is in turn configured to connect to the first end 12 of the lift arm 14 via a coupling mechanism which will be described in more detail below. , so that the spring assembly 20 can assume a disengaged condition and a coupled condition with respect to the sled system 30 .

Figs. 5 and 6 show the general components of a roof window spring assembly 20 . Further details and advantages of the particular spring assembly 20 are the subject of Applicant's copending patent application filed on the same day as the present application, and is shown for informational purposes only in Figs.

21 to 24. However, the present invention is applicable to any type of spring assembly. Thus, the general components of the spring assembly are: a tension bar 22 accommodating a shock spring system 28 and a main spring system 29 . The shock absorber spring system 28 acts as an auxiliary system to the main spring system 29 . In order to adapt one and the same spring assembly for different roof pitches, an adjustment means is provided in the form of a movable adjustment plate 26 which is placed in one of several recesses 27a in a spring housing 27 accommodating the system 28 shock absorber spring

As shown, the damper spring system 28 comprises an outer spring 281 and an inner spring 282 of substantially identical predefined lengths. The predefined length of the springs 281, 282 is typically chosen based on the dimensions of other parts of the lifting device. In the assembled condition, the inner spring 282 is accommodated within the outer spring 281 such that the axes of the respective springs are extend substantially coaxially.

In the embodiment shown, the outer spring 281 and the inner spring 282 of the damping spring system 28 have mutually different spring constants, and the outer spring 281 and the inner spring 282 of the damping spring system 28 have mutually opposite thread directions.

The spring assembly 20 herein further comprises at least one spring plug 283, 284 configured to contact the respective end of the inner spring 282 of the shock absorber spring system 28 in the assembled condition. That is, here the two spring plugs 283 and 284 form the respective ends of the damping spring system 283 and 284. At the manufacturing stage, it is advantageous for the spring plugs 283, 284 to be provided with friction-increasing means on the surface configured to be in contact with the respective end of the inner spring 282 of the damping spring system 28 . In this way, the two springs are securely held together.

In accordance with the present invention, and with reference also to the schematic views of Figs. 12a-12e showing the stages of coupling and uncoupling, the coupling mechanism comprises a first coupling member 21 associated with the spring assembly 20 as shown more clearly in Fig. 6.

The first coupling member 21 is adapted to cooperate with a second coupling member associated with the sled system 30. In the first, second and third embodiments shown in Figs. 10-11 and 13a-15b, and Figs. 18a-20b, the second coupling member comprises a sled 31 which forms part of the sled system 30, and the sled 31 includes receiving means configured to cooperate with the first coupling member 21 in the coupled condition.

In all the embodiments shown, the first coupling member includes a hook element 21 for cooperating with the second coupling member including its receiving means formed on the sled system 30. The hook element 21 is configured to assume at least one non-engaging position and one engaging position, and the coupling mechanism further comprises a coupling plate 25 arranged to assume at least a first position corresponding to the engaged condition and a second position corresponding to the disengaged condition, the coupling plate 25 allowing the hook element 21 to assume said non-engaging position. The operation of the presently preferred embodiments will be described in more detail in connection with Figs. 12 noon to 12 noon.

In the embodiment shown, the hook element 21 of the first coupling member has at least one hook portion 214 facing the sled system 30. This provides a particularly easy and safe docking procedure.

According to the invention, the hook element 21 as shown in, for example, Fig. 8d has a U-shaped configuration including a base plate portion 212 and two flange portions 213, one flange portion 214 being provided. hook on each of the flange portions 213 .

Turning now in particular to the exploded view of Fig. 7 and the individual detailed views of Figs. 8a to 8e, the tension bar 22 of the spring assembly 20 comprises a bar portion 221 extending substantially along the length of the spring assembly 20, and a head portion 222 facing the hook element 21, the tension bar 22 being provided with at least one sloped part 223, sloped 224 at the transition between the head part 222 and the bar part 221.

In the first embodiment, the hook element 21 of the first coupling member is provided with an opening 211 in the base plate part 212 to allow the passage of the tension bar 22 so that the head part 222 of the bar Tension 22 is retained within the U-shape on the front side of base plate portion 212 and bar portion 221 on the rear side.

The coupling plate 25 of the coupling mechanism has a base part 252 which in the assembled position is located on the rear side of the base plate part 212 of the hook element 21, i.e. opposite the sled system 30, and is provided with an oblong opening 251 to allow the passage of the rod portion 221 of the tension rod 22 and wherein the coupling plate 25 can slide in the plane of the base portion 252 substantially perpendicular to the portion 221 such that when in a lower position, the hook portion 21 is able to assume its latching position, and in an upper position, the hook portion 21 is held in its non-latching position.

Furthermore, the coupling plate 25 is here provided with a lower flange 253 formed on the base part 252 to abut the at least one inclined part 223 in the non-engaging position through the base plate part 212 . This causes the actual retention of the hook element 21 in its non-hook position in the embodiment shown.

The coupling plate 25 is provided with a cutout 254 at the top of the base portion 252 to form at least one, preferably two, vertical ears 255 . This makes it easy to apply tools and re-enter the mating position. In addition, the cut 254 allows the accommodation of reinforcement or stiffening elements for the blade.

In principle, the configuration of the connection between the first coupling member and the spring assembly 20 can be carried out in any suitable manner as long as it meets the requirements due to the relatively large forces involved. A robust structure as in the present embodiment includes an angular element 23 provided near the head part 222 of the tension bar 22, having an opening 231 to allow the passage of the bar part 221 of the tension bar 22.

Here, an end piece 24 is further provided, having an opening 241 to allow the passage of the rod portion 221 of the tension rod 22, the end piece 24 further having a vertical wall 242, in which a protrusion is formed. 243 to surround the opening 241 of the end piece 24, and wherein two protruding flanges 244 are provided on either side of the vertical wall 242 to define a track 245.

As shown, the angular element 23 is provided with a vertical leg 232 and a lower leg 233, the opening 231 of the angular element 23 being provided in the vertical leg 232, and in which two protruding flanges 234 are arranged substantially in parallel. to the base leg 233 and each define a space 235 with respect to the vertical leg 232 .

In the assembled state, the end piece 24 is placed with the rear side of its vertical wall 242 abutting the front side of the vertical leg 232 of the corner element 23, between the lower leg 233 and the protruding flanges 234, and where the base portion 252 of the coupling plate 25 is slidably received in the track 245 of the end piece and the respective spaces 235 of the angular element 23.

In order to obtain a smooth movement during the coupling procedure, each flange part 213 of the U-shaped hook element 21 here includes an apex 210 at the front end, a rounded transition 215 between the apex 210 and the hook part 214, a bottom edge portion 218 between hook portion 214 and base plate portion 212, an opposite top portion 217, and at least one sloping edge portion 216, 219 between top portion 217 and apex 210.

In the third embodiment, the components of the coupling mechanism shown in Figs. 18a-18e have a substantially corresponding configuration as in Figs. 8a-8e. The following differences are present in the embodiment shown; they can be present individually or in combination: the hook element 21 is provided with two grooves 217a in the upper part 217 to provide a possible additional guide. The flanges 244 protruding from the end piece 24 are provided with a respective rib portion 244a and two bent flange portions 246 on the side facing the spring arrangement 20. The angular element 23 is provided with enlarged opening sections 231a adjoining the opening 231 in order to accommodate the bent flange portions 246 . In this way, easy mounting and secure retention during use is achieved. Finally, the coupling plate 25 is provided with friction-increasing portions 256, for example, in the form of serrations or other surface treatment to increase friction and improve retention of the coupling plate 25 in the desired position. Corresponding friction-enhancing portions may be provided on the opposite side of base portion 252 . The friction-enhancing portions may also be provided as separate items, eg, a film or the like applied to the base portion 252 . The components of the coupling mechanism must be properly sized relative to each other to avoid excessive frictional forces, but still allow proper operation.

More details of the sled system 30 are shown in the second and third embodiments in Figs. 10 to 11 and 13a to 15b, and Figs. 18a-20b. Elements having the same or analogous function as in the first embodiment bear the same reference numerals. Only differences relative to the first embodiment will be described in detail.

Referring now in particular to Figs. 10-11, 13a-13b and 15a, the sled 31 of the sled system 30 comprises a bottom part 310, a first wall part 311 and a second wall part 312, preferably having a receiving recess 314 provided in each. of the transitions between the first wall part 311 and the lower part 310 and between the second wall part 312 and the lower wall part 310, and wherein a hole 315 is provided in the first wall part 311 and a hole 316 in the second wall portion 312 to receive a shaft 40 connected to the first end 12 of the lifting arm 14. Finally, the sled 31 is provided with a second opening 318 and an incision 319 to make room for other parts of the lifting device 10.

In the third embodiment of the roof window shown in Figs. 19a-19b, the sled 31 has been made longer relative to the sled of the first and second embodiments. This provides the sled 31 with greater strength. As a consequence, the incision 319 lengthens.

In the presently preferred embodiments shown and described herein, the second coupling member receiving means includes at least one receiving recess 314 in the sled 31 of the sled system 30 . The second coupling member could also take other forms. A conceivable alternative solution would be to use the shaft 40 as receiving means. This alternative solution is shown in Fig.17.

Additional details of shaft 40 shown in Figs. 15a-15b, 16 and 20b are given for informational purposes only and are the subject of applicant's co-pending patent application filed on the same day as the present application.

In general, lifting device components are subjected to high loads, particularly on large roof windows and low pitched roofs. In such fields of application, the required lifting capacity of the lifting device can amount to about 500 Nm. Loads of these magnitudes not only place severe demands on components, but also require high performance from the spring assembly.

In addition to the aspects covered by the present application, precautions have also been taken to mitigate the adverse effects of loading on the upper hinge pin 11 and upper bearing fitting 15. In order that the upper hinge pin 11 is securely housed in the upper bearing fitting 15 at all times, the upper hinge pin 11 has been formed with a head and is further secured against rotation. In order to transfer the load on the upper hinge pin 11 exerted by the sash through the intermediate frame safely to the upper bearing fitting 15, the upper bearing fitting 15 is provided with projections (not shown in detail).

To control frictional forces more precisely in the movement of the sled system 30 in the sled guide 16, the sled system 30 comprises a slider 32 in the embodiments described and shown in particular in Figs. 10-11, 14a-14b and 20a-20b, configured to accommodate the sled 31 and being provided with at least one recess 324 opposite the respective sled 31 receiving recess 314 of the second coupling member. Further details of slider 32 are shown for informational purposes only; such details are the subject of applicant's co-pending patent application filed on the same day as the present application. It is noted that the present invention is also applicable to sled systems in which there is no slider, or a slider of a different configuration. In the embodiment shown, the slider 32 is formed of a plastic material such as POM which may also be provided with a coating of, for example, Teflon® or another treatment that has the function of acting as a lubricant to reduce friction.

The narrowing 313 of the slider 32 is made for reasons of space availability. By making the slider thinner on one side, it is possible to make 322a thicker, and tolerances are accommodated on the side where 322 is; in this way, the shaft 40 is guided so that the end 402 does not protrude to wear on the side of the guide.

An edge portion 328 is provided as a cutout to make room for other parts of the assembly. A flange portion 329 scrapes the guide to force, for example, accumulated stains on the sled guide 16 to the sides of the guide.

In principle, the coupling mechanism can be designed in any suitable way and operated accordingly, as long as the fundamentals as initially described are met. As will be understood from the following description of the operating steps performed during the coupling and uncoupling of the spring assembly 20 from the sled system 30 in the embodiments shown and described above with reference to the sequence of Figs. 12a-12h, the hook element 21 of the first coupling element, in the presently preferred embodiments, is arranged to slidably engage the sled system 30 in one direction and to engage said second coupling element, in the presently preferred embodiments. shown embodiments, the sled 31, in another direction, ie, by being forced in the opposite direction to ensure engagement with the first and second coupling members by the components of the lifting device itself. Not all elements are indicated with reference numerals in Figs. 12a to 12h for ease of reading and reference is made to the above description of the remaining Figures for detailed explanations.

Turning first to Fig. 12a, the roof window is shown in its closed condition, that is, the secondary frame or frames are substantially parallel with the primary frame. Here the intermediate frame 3 represents the secondary frames, and the position of the sled guide 16 and spring assembly 20 indicate the corresponding position of the fixed frame 1, although not shown, i.e. here substantially horizontal for clarity. , although the fixed frame 1 will most often be installed on a sloping ceiling surface before the spring assembly 20 is attached to the sled system 30 . The coupling mechanism is not yet active, and the sled system 30 is accordingly located at a distance from the spring assembly 20. In the enlarged exploded view of Fig. 12a, the position of the coupling plate 25 in its first position, i.e. the lower position, is evident and corresponds to the coupling position of the hook element 21 in which the coupling is possible.

As the window is opened by rotating the intermediate frame 3 about the upper hinge pin 11, the lift arm 14 also rotates, and the sled system 30 moves in the direction of the spring assembly 20 and its associated first coupling member in the forms hook element 21. Approaching the position shown in Fig. 12b, the hook member 21 slides up on the sled 31 and can rotate slightly on the tension bar 22, since the base plate portion 212 of the hook member 21 it can move with respect to the inclined part 223 on the rear side of the head part 222 . The docking plate 25 is still in its first or bottom position. During the continuous movement in the opening direction of the intermediate frame 3 and the consequent translational movement of the sled system 30, the hook portions 214 of the hook element 21 will reach a position just above the receiving recesses 314. When the spring assembly 20 is pushed and pulls on the tension bar 22, on the left in Fig. 12b, the hook member 21 will be subjected to a clockwise moment which in turn forces the hook portions 214 into the receiving recesses 314 of the sled 31.

Once engagement has taken place, the hook member 21 is retracted further to the left due to the bias of the spring assembly, the hook portions 214 being brought into stable engagement with the receiving recesses 314 in the sled 31 as it is shown in Fig. 12c.

The window is now ready for normal operation, and during the subsequent closing of the intermediate frame 3, the movement of the lifting arm 14 pulls the sled system 30 towards the top of the window, i.e. towards the right as shown. in Fig. 12d. The closing movement takes place during the simultaneous further pushing of the spring assembly 20, as is known per se.

Should the need arise to remove the secondary frame(s), the roof window is prepared for disengagement by first rotating the intermediate frame 3 to an open position. Next, the coupling plate 25 is brought from its first or lower position to its second or upper position by an upward movement, indicated by arrow A in Fig. 12f. In the embodiment shown, the window is not fully open in the position of Fig. 12f, that is, the sled system 30 is not in its leftmost position, but is spaced away from the spring assembly 20 by a few millimeters. . In use, the sash is rotated to its fully open position and then moved slightly backwards in the closing direction so that the coupling plate 25 is free to move upwards. In this position, the coupling plate is held in its highest position by friction. The hook member 21 is still engaged with the sled system 30 when the hook portions 214 are gripping the recesses 314 of the sled 31 until the user grabs the blade and lifts it. During this movement, the hook element 21 is allowed to rotate upwards in the counterclockwise direction. This brings the hook element 21 into its non-engaging position where engagement is not possible. This action occurs because the lower flange 253 of the coupling plate 25 bears against the rear side of the base plate part 212 of the hook element 21. The hook element 21 is affected by a counterclockwise moment which holds it in the non-hook position. The secondary frame(s) can now be detached from the primary frame, here the intermediate frame 3 with sash 2 and sash 4 can be lifted from the connection with the fixed frame 1. The lifting of the coupling plate 25 can in principle take place in any suitable way. However, to ensure that an unwarranted release does not occur, the use of a suitable tool is preferably prescribed. The return of the roof window to a position ready for coupling is done simply by turning the intermediate frame 3 in the closing direction. Towards the end of the closing movement, the lifting arm 14 pushes the coupling plate 25 downwards, in the direction of arrow B in Fig. 12h. Once the counterclockwise moment previously acting on the hook member 21 is released, the hook member 21 can rotate clockwise to assume the position shown in Fig. 12th

Above, the invention has been described with reference to the sash and frame of a roof window, but it will be understood that it also applies to other frame structures, such as door frames.

Number Reference List

1 primary frame (fixed frame)

2 first secondary frame (leaf)

3 second secondary frame (intermediate frame)

4 crystal

5 top mount accessory

6 pivot hinge accessory frame hinge part

7 handle

8 ventilation device

10 lifting device

11 hinge pin

12 first lift arm end

13 second lift arm end

14 lift arm

15 upper bearing attachment

16 sled guide

spring set

first coupling member/vertex hook member

opening

base plate part

tab part

hook part

transition edge part rounded edge part sloping

upper part

a slot at the top

bottom edge part

sloping edge part

tension bar

bar part

head part

first inclined part

second part tilted

trim ring

angular element

opening

to enlarged opening sections

upright leg

lower leg

protruding tab

space

end piece

opening

upright wall

outgoing

protruding tab

apart from rib

clue

bent tab parts

coupling plate

oblong opening

base part

3 bottom tab

4 cut

5 vertical lugs

6 parts increase friction

trim plate

spring casing

to recess for adjustment plate

shock absorber spring system outer spring

2 inner spring

3 spring stopper

4 spring stopper

spring mainspring system

2 spacer tube

sled system

second coupling member/sled 0 bottom

first part of wall

2 second wall part

3 narrowing

4 receiving recess

5 hole

6 hole

7 first opening

8 second opening

9 incision

slide

0 bottom

first part of the wall

1st first stump section

2 second part of the wall

2nd stump section

3 part bowl

4 recess

5 cut

6 cut

resistant vertical part edge part

tab part

axis

knurled end

other end

brands

location mark friction brake device friction brake element first cone

second cone

spring stopper

Claims (16)

1. A roof window, in particular for installation on a sloped roof surface, comprising a primary frame (1), at least one secondary frame (2, 3), such as a leaf (2) and/or an intermediate frame (3), and a lifting device (10) including a lifting arm (14) inserted between the primary frame (1) and the at least one secondary frame (2, 3), a sled system (30) and a coupling mechanism, the lifting arm (14) having a first end (12) rotatably connected to the sled system (30) slidably connected to the primary frame (1) on a sled guide (16) and a second end (13) rotatably connected to the at least one secondary frame (3), the lifting device (10) further including a spring assembly (20) configured to engage the sled system (30) and the first end ( 12) of the lift arm (14) by means of the coupling mechanism, so that the spring assembly (20) can assume a disengaged condition and a coupled condition with respect to the sled system (30), the coupling mechanism comprising a first coupling member (21) associated with the spring assembly (20) ey adapted to cooperate with a second coupling member (31) associated with the sled system (30), and the first coupling member including a hook element (21) and the second coupling member including receiving means formed in the sled system (30) and configured to cooperate with said hook member (21) in the engaged condition, and the hook member (21) being configured to assume at least one non-engaging position and one engaging position, wherein the coupling mechanism further comprises a coupling plate (25) arranged to assume at least a first position corresponding to the coupled condition and a second position corresponding to the uncoupled condition, the coupling plate (25) that allows the element (21) hook assumes said non-hook position, wherein the hook element (21) of the first coupling member has at least one hook portion (214) facing the sled system (30), the hook element (21) having a U-shaped configuration including a base plate portion (212) and two flange portions (213), the at least one hook portion (214) being provided on one or each of the flange portions (213), wherein the spring assembly (20) comprises a tension bar (22) including a bar portion (221) extending substantially along the length of the spring assembly (20), and a head portion 222 facing the hook element (21), the tension bar (22) is provided with at least one inclined part (223, 224) at the transition between the head part 222 and the bar part (221), wherein the hook element (21) is provided with an opening (211) in the base plate part (212) to allow the passage of the tension bar (22) so that the head part 222 of the bar (22) of tension is retained within the U-shape on the front side of the base plate part (212) and the bar part (221) on the back side, wherein the coupling plate (25) of the coupling mechanism has a base part (252) located on the rear side of the base plate part (212) of the hook element (21) and is provided with an opening ( 251) oblong to allow the passage of the bar part (221) of the tension bar (22), and in which the coupling plate (25) can slide in the plane of the base part (252) substantially perpendicular to the bar part (221) so that when in the first or lower position, the hook part (21) is able to assume its hooking position, and in the second or upper position, the hook part (21). hook remains in its non-engaging position, and wherein the coupling plate (25) is provided with a lower flange (253) formed on the base part (252) to rest on the at least one inclined part (223) in the non-engaging position. A roof window according to claim 1, wherein the coupling plate (25) is provided with a cutout (254) in the upper part of the base part (252) to form at least one, preferably two, lugs. (255) vertical. A roof window according to any one of claims 1 to 2, wherein an angle element (23) is provided near the head portion 222 of the tension bar (22), having an opening (231) for allow the passage of the bar portion (221) of the tension bar (22). A roof window according to claim 3, wherein an end piece (24) is provided, having an opening (241) to allow the passage of the bar portion (221) of the tension bar (22), the end piece (24) further having a vertical wall (242), in which a projection (243) is formed to surround the opening (241) of the end piece (24), and in which two flanges (244) are provided ) protruding on each side of the vertical wall (242) to define a track (245). A roof window according to claim 4, wherein the angular element (23) is provided with a vertical leg (232) and a lower leg (233), the opening (231) of the angular element (23) being provided in the vertical leg (232), and wherein two flanges (234) are provided which project substantially parallel to the lower leg (233) and each define a space (235) with respect to the vertical leg (232). A roof window according to claim 5, wherein the end piece (24) is placed with the rear side of its vertical wall (242) resting on the front side of the vertical leg (232) of the angular element (23). , between the lower leg (233) and the protruding flanges (234), and wherein the base portion (252) of the coupling plate (25) is slidably received in the track (245) of the end piece and the respective spaces (235) of the angular element (23). A roof window according to any one of claims 1 to 6, wherein each flange portion (213) of the U-shaped hook element (21) includes a vertex (210) at the front end, a transition ( 215) rounded between the apex (210) and the hook portion (214), a bottom edge portion (218) between the hook portion (214) and the base plate portion (212), a portion (217) opposite top portion and at least one sloping edge portion (216, 219) between the top portion (217) and the apex (210). A roof window according to any one of the preceding claims, wherein the second coupling member receiving means includes at least one receiving recess (314) in a sled (31) of the sled system (30). A roof window according to claim 8, wherein the sled (31) comprises a bottom part (310), a first wall part (311) and a second wall part (312), preferably a recess ( 314) of reception at each of the transitions between the first wall part (311) and the lower part (310) and between the second wall part (312) and the lower wall part (310), and where A hole (315) is provided in the first wall portion (311) and a hole (316) is provided in the second wall portion (312) for receiving a shaft (40) connected to the first end (12) of the arm (14). ) of elevation. A roof window according to claim 8 or 9, wherein the sled system (30) comprises a slider (32) configured to accommodate the sled (31) and provided with at least one recess (324) opposite the respective recess (314) for receiving the sled (31). A roof window according to any one of claims 1 to 7, wherein the second coupling member receiving means includes a shaft (40) connected to the first end (12) of the lifting arm (14). A roof window according to any one of the preceding claims, wherein the hook element (21) of the first coupling member is arranged to make sliding contact with the sled system (30) in one direction and to engage said second coupling member (31) in another direction. A roof window according to any one of the preceding claims, wherein the coupling plate (25) is provided with at least one friction-enhancing portion (256). 14. A method of installing a roof window having a primary frame, at least one secondary frame and a lifting device inserted between the primary frame and the secondary frame, comprising the steps of: i) providing a roof window according to any one of claims 1 to 13; ii) install the primary frame on a roof structure; and iii) coupling the secondary frame to the primary frame. 15. The method according to claim 14, wherein step iii) includes the step of a) sliding the sled system into the sled guide opening the secondary frame until the first coupling member contacts and engages the second coupling member; and b) close the child frame. 16. A method for removing the secondary frame of a roof window according to any of claims 1 to 13, including the steps of a) opening of the secondary frame; b) place the coupling plate in the second position; c) pressing the first coupling member against the coupling plate further opening the secondary frame, and d) removing the secondary frame.