EP2479370B1

EP2479370B1 - Roof window with balcony function

Info

Publication number: EP2479370B1
Application number: EP10193745.6A
Authority: EP
Inventors: Bronislaw Zwyrtek
Original assignee: Fakro PP Sp zoo
Current assignee: Fakro PP Sp zoo
Priority date: 2010-12-03
Filing date: 2010-12-03
Publication date: 2016-02-10
Anticipated expiration: 2030-12-03
Also published as: EP2479370A1

Description

The subject of the invention is a roof window having at least one sash opened as a tilting one, by turning it about a geometrical instantaneous axis of rotation, being translocated close to the bottom zone of that sash. A particular subject of the invention is double-sash roof window, in which the tilting (lower) sash opens together with side barriers, so that in their opened state they fulfill jointly the function of a balcony, wherein the upper part of the sash takes in its open state a position on a height, which is more comfortable for the user of the balcony.
State of the art. It follows from PCT/DK89/00029 ( WO 90/09493 ) that there is a known solution of a double-sash roof window, in which the lower sash is opened together with side barriers. In that window, the lower sash is connected at its bottom in hinged mode with an articulated parallelogram, by which the sash is being moved during its opening beyond the bottom member of the window frame.
A similar window is known from PCT/DK89/00033 ( WO 91/14068 ), in which the lower sash is connected at its bottom in hinged mode with an extension arm moved out in telescopic way, parallel to the window frame. In both solutions, closing of the lower sash requires moving it back to the window frame, i.e. lifting to a higher level, which is, due to the lack of a mechanism assisting that movement, an essential hindrance in using that window.
According to the invention, the roof window, especially with the balcony function, having a window frame and at least a sash opened as a tilting one, is specific by the feature that the sash frame tilting about its bottom, is at its both sides connected with the window frame by hinged mechanisms, each being fitted with an extension arm and a lever hinged at the sash frame.
The extension arm, connected at its bottom end in hinged mode to the window frame, moves in the extension arm guide, set on the lower part of the side member of the window frame. Due to that, the tilting window is being opened by turning it about a geometrical instantaneous axis of rotation located close to the bottom zone of that sash, which axis of rotation moving beyond the bottom member of the window frame.
The sliding extension arm, in the initial phase of its movement down, is being raised above the bottom transverse member of the window frame, and moves the frame of the tilting sash above that member of the window frame. In order to achieve that movement, the central part of the surface of the extension arm, at the side of the window frame, has the shape of a cam moving along a support, preferably a roller, situated at the bottom part of the window frame guide. The upper end of the extension arm moves on a curvilinear section of the extension arm guide, in which the upper end of the extension arm rises above the window frame when the extension arm approaches its most extended position.
This causes lowering of the bottom end of the extension arm below the straight line being a prolongation of the extension arm guide, and together with it sinks the tilting sash, due to which the upper part of the sash takes in its open state a position on a height, which is more comfortable for the user of the balcony.
The upper end of the lever is connected by a pull rod with the upper end of the extension arm. Due to that, when the sash is being tilted in the first phase of its closing, the movement of that sash is transmitted on to the extension arm, shifting it up in the extension arm guide and on the window frame. The user of the window, when moving the lower sash upon unlocking the locks, has only to grip the upper section of the sash frame, and then to tilt the sash to the window frame.
The hinge mechanism is also provided with an extension arm spring, assisting the movement of the extension arm in its guide, and with it, the movement of the tilting sash. The spring is a helical compression spring put on a mandrel connected with the extension arm in its central part. The mandrel passes through two fixed stops and two movable stops placed between them, with the spring being mounted between the moving stops.
Owing to that, the spring acts both ways, assisting the starting movement of the sash at its end positions, i.e. the totally closed and totally open one, and dampens the movement of the sash when reaching any of them. The free length of the extension arm spring is smaller than the maximum spacing between the moving stops, owing to which the spring is out of action when the sash moves within the central range of its stroke, but acts when the sash reaches its end positions.
The upper end of the lever of each of the hinge mechanisms is connected with the tilting sash of the window by the hinge slide, moving in the sash guide. That guide is placed along the side section of the tilting sash frame and fixed to it. When opening the tilting sash and the extension arm is being correspondingly moved out of the window frame, the hinge slide goes up, whereas when the sash closes, the hinge slide moves down on the side member of the sash frame.
In the tilting sash there are also springs placed along the sash guides, acting in conjunction with the hinge springs, which dampen the stroke of these slides near the closed positions of the sash, by the same dampening the sash movement at the final phase of its closure. These springs, which are helical and compressed ones, are pressed when the hinge slide moves down, assisting the action of the extension arm springs.
The roof window according the invention is specific also by the system of joining the hinge mechanisms with the tilting sash. The upper end of the lever in the hinge mechanism and the hinge guide in the tilting sash are pivoting by means of a pivot set into one of these two joined elements, and a pocket in the other one. It is advantageous when the pivot is firmly set in the hinge slide, and the pocket in the lever is open on its upper side, so that the lever end is forked. Upon leading the pivot of the hinge slide into the lever pocket, that pivot can be secured against self-acting sliding-out by a shape joint consisting of a transversal pin moving across the plane of lever movement. The pin is sliding in the hinge slide, and upon its moving out to its operating position, its tip enters into an oblong, curved opening in the lever, located slightly lower than the pocket for the hinge slide pivot. The transversal pin, upon sliding it out of the hinge slide and inserting into the oblong opening in the lever, is being fixed in that position by a rotary bolt set in the hinge slide.
The bottom end of the sliding extension arm and the tilting sash frame are hinging by a pivot set in one of the elements being connected and a seat in the other one. It is advantageous when the pivot is fixed in the extension arm, and the seats are made in the tilting sash, precisely in the bearing plates of that sash. Tke seats have an oblong shape with side way-in, which makes it easy to lead the seats in the bearing plates on to the extension arm pivots, having previously connected the slide pivots with the levers in the hinge mechanisms. The pivots connecting the extension arms with the tilting sash are secured against self-acting sliding-out of the seat by means of a shape lock consisting of rotary catches. It is advantageous when the pivots in the slides are secured by rotary catches mounted in the bearing plates of the tilting sash.
The window acting additionally as a balcony is a twin-sash facility, and its tilting sash, the bottom one, is being opened jointly with the side barriers, which are collapsed when the window is closed and concealed under the flashing of the window sash, while, when opening the sash, they are expanding to act as balcony barriers. The sash in its open state constitutes the front wall of that balcony.
In the upper part of the tilting sash frame there is a hand-rail slide moving along the side member of the frame of that sash, preferably within a sash guide, common for both the hand-rail slide and the hinge slide. The hand rail-slide has a seat for the pin of the hand-rail, which upon inserting it into the seat is secured by a catch. The tilting sash is connected by the hand-rail slide with the hand-rail of the side barrier, the opposite end of which moves in the window frame guide, which is fixed along the side member of the window frame. Besides, the barrier has a slipper link, the bottom end of which is hinged at the extension arm guide, and has several safety bars. The slipper link and the safety bars take various angles in the course of opening or closing the tilting sash. In closed state, they are parallel to the side element of the window frame, while in open position they stand roughly upright.
The upper sash of the roof window playing also the role of a balcony is assembled in a common window frame with the tilting sash, and opens preferably upwards. In its closed position, the upper sash overlaps directly the upper member of the tilting frame sash. It is advantageous when the upper sash is a double-action one, i.e. that it can be opened as a tilting one, about an axis located near the upper edge of that sash, or as a turning one, about a horizontal axis located at the central zone of the sash.
The window frame guide, upon which moves the window frame slide of the barrier, is laid on the whole length of the side member of the window frame, also in the zone outside the range of the window frame slide when the sash is closed, and of the barriers folded along the window frame. In the upper part of that window frame guide are fixed the sub-assemblies fastening the upper sash to the window frame.
The roof window according the invention, due to its fitting with springs assisting the movement of the lower sash, is easy to operate, requiring less force to open or shut the lower sash than in known windows. Favorable is also the straightforward assembly of the window, due to the system of connections of the hinge mechanisms and the lower sash by means of pivots and seats.
The roof window, especially with the function of a balcony, is presented in the embodiment in which the separate figures represent:

Fig. 1 -: The window open, with balcony function - in axonometric view,
Fig. 2 -: The hinge mechanism of the tilting sash in closed sash position - an orthogonal projection, seen from the side the tilting sash, the sash, with removed sash, sash guide, and hinge slide,
Fig. 3 -: The hinge mechanism of the tilting sash in position shown in Fig. 2 - with further components being removed.
Fig. 4 -: The hinge mechanism of the tilting sash of Fig. 2 - in opened sash position,
Fig. 5 -: The hinge mechanism of the tilting sash of Fig. 2 - in intermediate position between the closed and the opened ones, with the extension arm being raised on its cam almost to the highest degree above the window frame,
Fig. 6 -: The hinge mechanism of the tilting sash in intermediate position between positions shown in Fig. 2 and Fig. 4 - in axonometric view from the outside of the window.
Fig. 7 -: The connection of the hinge mechanism with the hinge slide - in axonometric view from the outside of the window.
Fig. 8 -: The hand-rail and the hand-rail slide before their joining - in axonometric view from the outside of the tilting sash.

The roof window has a window frame 1 consisting mainly of two side members 11, the transversal lower member 12, and the transversal upper member. At the bottom of window frame there is mounted the tilting sash 2, opened downwards by turning it about an instantaneous axis of rotation, which moves close to the lower member 12 of the window frame. The upper sash being opened upwards is also mounted in the window frame.
The frame of the tilting sash 2 is connected at its bottom, on both sides, with the window frame 1, by means of hinge mechanisms, each of which is provided with an extension arm 3 and a lever 4 hinged at the window frame. The extension arm 3 moves within the extension arm guide 5 fixed on the lower part of the side member 11 of the window frame. The extension arm 3 is hinged by its bottom end with the tilting sash 2 by the pivot 31, which is fixed in the extension arm and inserted into the bearing plate 23, fixed to the lower part of side member 21 of the tilting sash.
On the sliding extension arm 3, on the central part of its surface, on the side of the window frame 1 there is a cam 32, which moves along a support in the form of the roller 51 located in the lower part of the window frame guide. Due to that, the extension arm 3, in its initial phase of moving down, is raised above the bottom member 12 of the window frame and moves the tilting sash above that member of the window frame.
The extension arm 3 operates in conjunction with the cross slide 33 in the extension arm guide 5, so that the cross slide moves only rectilinearly along that guide, because any freedom of movement in a direction perpendicular to the surface of the base 52 of the extension arm guide 5 is impeded to the cross slide by the sliding strip 53, mounted above its abutting surface 34 on the extension arm guide.
The cross slide 33 is made with an oblong hole 35, perpendicular to the base 52 of the extension arm guide, and the extension arm 3 has a pin 36 entering into that hole, the pin moving within the hole in the cross slide as the extension arm 3 rises on the cam 32.
The upper end of the extension arm 3, fitted with the guiding roller 37, moves along the curvilinear part 55 of the extension arm guide, when the extension arm approaches its most outward position. Due to that, the upper end of the extension arm 3 together with the guiding roller 37 rises above the window frame 1, which causes lowering of the bottom end of the extension arm 3 and together with it, lowering of the tilting sash 2.
The lever 4, hinging in the window frame, is set in the extension arm guide 5 concentrically with the roller 51, which supports the cam of the extension arm. The upper end of the lever 4 is connected with the tilting sash 2 by the hinge slide 41, which moves along the side member 21 of the sash frame in the sash guide 22. When the tilting sash 2 is being opened, the hinge slide moves up in the sash, while when the sash is being closed, it returns to the lowest position in that sash.
The hinge slide is placed between the sash frame and the bearing plate 23 of the tilting sash 2; therefore, in the Figures 2, 3, and 4, it remains above the plane of the drawing. The pin 42 protruding out of the hinge slide 41, mating with the open seat 43 at the end of the lever 4, passes through the oblong hole 24 in the bearing plate 23 of the tilting sash.
The upper part of the lever 4 is connected with the upper part of the extension arm 3 by means of the link 44, the task of which is moving the extension arm 3 up on the extension arm guide 5 when the tilting sash is being closed. The user of the window executes that closing by pulling the upper member 25 of the tilting sash frame.
The hinge mechanism has an extension arm spring 6 assisting the movement of the extension arm 3 in the extension arm guide 5, and together with it, assisting the movement of the tilting sash guide 2. It is a helical compression spring put on the mandrel 61 connected with the extension arm 3 in its central part by means of the cross slide 33. The mandrel 61 passes through two fixed stops. i.e. the upper fixed stop 56 and the lower fixed stop 57, which are parts of the extension arm 5, immobilized on it, and passes through two movable stops, i.e. the upper movable stop 62 and the lower movable stop 63, which can move on the mandrel 61. The diameter of the mandrel is stepped, so that in its thicker part 63 at the side of the cross slide 33 the diameter of the mandrel is greater than the bore in the lower movable stop 63, and smaller than the bore in the fixed bottom stop 57. The diameter of the thinner section of the mandrel is smaller than the diameter of the bores in both movable stops 62, 63. On the thinner, threaded end of the mandrel 61 there is mounted the adjusting-and-abutting nut 65, possibly supplemented by a spacing sleeve. The external diameter of the nut 65 or of the distance sleeve is greater than the diameter of the bore in the upper movable stop 62, but smaller than the diameter of the bore in the upper fixed stop 56. The extension arm spring is mounted between the movable stops, due to what it is double-acting, operating when the tilting sash approaches any of its end positions.
On opening the tilting sash 2, when the extension arm 3 moved beyond the bottom member of the frame 12 approaches the end position, the cross slide 33 moving out together with the extension arm pulls with it the pin 61. The nut 65 on the mandrel, or the mating with it distance sleeve, pass through the hole in the upper fixed stop 56 and presses the upper moving stop 62, which compresses the extension arm spring 6, which rests, through the lower movable stop 63, on the lower fixed stop 57.
When the tilting sash 2 is being closed, the extension arm 3 moves on the extension arm slide 5 upwards, to a position within the window frame, and when it approaches the end position, the cross slide 33 returning together with the extension arm pushes the mandrel along the window frame 1 to its upper part. The thicker part 64 of the mandrel 61 passes through the hole in the lower fixed stop 57 and presses the lower movable stop 63, which in turn compresses the extension arm spring 6, which rests, through the upper moving stop 62, on the upper fixed stop 56. The action of the spring 6 near both end positions of the tilting sash 2 cushions the movement of the sash when coming close to these positions, and also assists the sash movement during the initial phases of its opening and closing. In the positions of the sash near the middle of its range, both during opening and closing, the extension arm spring 6 is loose and does not assist the movement of the sash, as at that part of the opening angle no assistance is necessary.
The action of the extension arm spring, when the tilting sash is near the shut position, is assisted by the spring attenuating the movement of the hinge slide, placed within the tilting sash. This spring, a helical and compression one, is located along the sash guide and is being compressed when the hinge slide is moving down the sash.
The window made according the invention is characterized by easy joining of its hinge mechanism with the tilting sash. The seats 43 in the levers 4 open from above, shaped as forks, enable quick and safe inserting into them the pins 42 protruding from the hinge slides 41 at both sides of the tilting sash 2. The seats 27 in the bearing plates 23 have an oblong shape with a side way-in, which, upon connecting the pins of the hinge slides with the levers 4 of the hinge mechanisms, enables easy leading the seats 27 of the bearing plates 23 onto the pins 31 of the extension arms. The pivot of the hinge slide 42 is secured against self-acting moving out by means of the pin 46, transversal in relation to the plane of the lever movement, which is being inserted from the side of the hinge slide into the oblong, curved hole 46 in the lever 4. Upon fitting the transversal pin into the opening 46 in the lever 4, it is being secured in that position by a rotary bolt, located in the hinge slide 41.
At the connection of the bottom end of the extension arm 3 with the bearing plate 23 of the tilting sash 2, the protection of the pin 31 of the extension arm 3 against its self-acting sliding out from the seat 27 in the bearing plate 23 is provided by the rotary catch 26 mounted in the bearing plate 23 of the tilting sash. The rotary catch 26 moves onto the pivot 31 of the extension arm between the bearing plate 23 and its cover 28. In the figures 2, 3 and 5 of the drawing, the rotary catch 26 is shown in locked position on the pivot of the extension arm, while in fig. 4 - in open position.
At both sides of the tilting sash 2 are assembled the sets of side barriers (shown on one side only), which consis, among other, of the hand-rail 7 with the attachment 72 and the connecting link 71 fixed to the extending arm guide 5. The connecting link 71 and its attachment 72 assume various angles during opening or closing of the tilting sash 2. In its closed state (see drawing, Fig. 3), they are parallel to the side member 11 of the sash frame, while in its open state (see drawing, Fig. 1 and 4), they are approximately vertical. One end of the hand-rail 7 is connected in hinged and sliding manner with the tilting sash 2 by the intermediary of the hand-rail slide 73, which moves in the sash guide 22 along the side member 21 of the tilting sash 2. The sash guide 22 is common for the hinge slide and the hand-rail slide. The hand-rail slide 73 has in its external plate a seat 74 for the pivot 75 of the hand-rail 7, which pivot, upon inserting it into the seat 74, is secured by the latch 76 with a spring (not shown).
The hand-rail slide 73 is connected with the sash guide 22 fixed to the side member 21 of the sash frame by means of slippers 77 provided with grooves, which grasp the edges of the sash guide on both sides. The hinge slide is also connected with that guide by such slippers.
The opposite end of the hand-rail 7 is connected in hinged mode, through the window frame slide, with the window frame guide fixed along the side member 11 of the window frame, on its upper surface. When closing the tilting sash 2, the hand-rail slide 73 moves down on that sash, due to which a part of the hand-rail 7, in closed position, enters into the window frame 1 space for the tilting sash, and the end of the hand-rail together with the window frame slide does not reach too high. In its bottom position, the window frame slide is secured by the stopping and sliding assembly. The stopper limits the stroke of the window frame slide downwards, and therefore fixes the barrier hand-rail 7, so fixing the tilting sash 2 in its open position. A catch mating with a pawl mounted in the window frame slide blocks the upward stroke of the window frame slide, and in that manner impedes uncontrolled closing of the tilting sash, e.g. due to wind pressure.
In the window with the balcony function, made according to the embodiment, the upper sash 8 of the roof window can be opened by two alternative manners, using the mechanism described in the patent application No P-383664 . In the tilting manner, the sash with its intermediate arms 81 turns about the axis rotation of the hinges 82 located close to the upper edge of this sash. In the turning mode, the intermediate arms 81 are placed along the side members 11 of the roof window frame, and the sash 8 turns only about the hinges 83 placed at the central part of that sash. The grips for the mechanism opening the upper sash are set in the window frame guide, at its upper part, out of reach for the barrier hand-rail in its closed position, along the side member of the window frame. When the roof window is closed, the upper sash 8 rests, overlapping the upper member 25 of the tilting sash 2.

Claims

Roof window, designed for mounting on a sloping roof surface, the roof window comprising a window frame (1) at least one tilting sash (2) and hinge mechanism connecting the tilting sash (2) at its bottom on both sides with the window frame (1); at least one tilting sash (2) being opened about a geometrical instantaneous axis of rotation located outside a hinge mechanism close to the bottom zone of that sash (2), which axis is being translocated during opening of the sash beyond the bottom member (12) of the window frame (1); especially a roof window with balcony function, particularly comprising a double sash window having a tilting sash (2) being opened together with side barriers (7) and fulfilling jointly with them the additional function of an opened balcony, in which the tilting sash (2) constitutes the front wall of that balcony, while the upper sash (8) is mounted in the common window frame (1) with the tilting sash (2) and overlaps in closed position directly the upper member (25) of the tilting sash frame, and is being opened upwards,
characterized in that
each hinge mechanism is provided with an extension arm (3) and a lever (4) with the lower arm of the lever (4) being hinged to the window frame (1) and the upper arm of the lever (4) connected by means of a link (44) with the upper end of the extension arm (3);
the extension arm (3) is hinged at its bottom end to the frame of the tilting sash (2) and movable within an extension arm guide (5) which is set on the lower part of the side member (11) of the window frame (1),
the hinge mechanism further comprises an arm spring (6) assisting the movement of the extension arm (3) in the extension arm guide (5), and thus the movement of the tilting sash (2).
Roof window according to claim 1 characterized in that the extension arm (3) during the initial phase of its downward movement rises above the lower, transversal member (12) of the window frame (1) and translocates the frame of the tilting sash (2) above that element of the window frame and the central part of the surface of the extension arm (3) on the side of the window frame (1) is a cam (32) moving on a support, advantageously being in form of roller (51), situated in the lower part of the extension arm guide (5).
Roof window according to claim 1 or 2, characterized in that the upper end of the extension arm (3), when approaching the most extended position, moves along a curvilinear section (55) of the extending arm guide (5) in which the upper and of the extending arm raises above the window frame (1), which causes lowering of the bottom end of the extending arm (3), and together with it, of the tilting sash (2).
Roof window according to any of claims 1-3, characterized in that the extension arm spring (6), is a helical compression spring, which is put on a mandrel (61) connected with the extension arm (3) in its central part, the mandrel passing through two fixed stops (62, 63), between which the extension arm spring (6) is placed and the length of extension arm spring (6) in loose condition is smaller than the maximum distance between the movable stops (62, 63).
Roof window according to any of claims 1-4, characterized in that the upper end of the lever (4) in the hinge mechanism is connected with the tilting sash (2) by means of the hinge slide (41) moving in the sash guide (22) along the side member (21) of that sash frame and in the tilting sash (2) are placed springs cushioning the movement of the hinge slides (41) in positions of the tilting sash (2), which are near its closure.
Roof window according to claim 5, characterized in that the upper end of the lever (4) in the hinge mechanism and the hinge slide (41) in the tilting sash (2) are joined in hinging mode by means of the pin (42) set in one of the elements being connected, advantageously in the hinge slide (41), and the seat (43) located in the other element, the pin (42) being secured against self-acting moving out of the seat (43) by shape locking, particularly a pin (45) transversal to the plane of movement of the lever (4), inserted into the longitudinal opening (46) in the lever and blocked in that position by a rotary bolt and the lower end of the extension arm (3) and the tilting sash (2) are joined in hinging manner by the pivot (31) set in one of the elements being connected, advantageously in the extension arm (3), and a seat situated in the other one, advantageously the seat (27) in the bearing plate (23) of the tilting sash, the pivot (31) being secured against moving out of the seat (27) by shape locking, advantageously in form of a rotary catch (26) mounted on the bearing plate (23) of the tilting sash.
Roof window according to any of claims 1-6, characterized in that in the upper part of the tilting sash (2) frame there is a hand-rail slide (73) moving along the side member (21) of the sash frame, advantageously in a guide common with the sash guide (22) of the hinge slide (41), where the tilting slide (2) is connected by the hand-rail slide (73) with the hand-rail (7) of the side barrier the opposite end of which moves in the window frame guide along the side member (11) of the window frame (1), and in the upper part of the window frame is mounted the upper sash (8) overlapping in closed position directly the upper member (25) of tilting sash frame and the window frame guide is arranged on the whole length of the side member (11) of the window frame (1), having in the upper part of that guide immovably mounted subassemblies fixing the upper sash (8) in the window frame.
Roof window according to claim 7, characterized in that the upper sash (8) is a double-function one, opened as a tilting sash about a turning axis located close the upper zone of that sash, and as a turning one, about a horizontal axis of rotation located in the central zone of that sash.
A roof window, according to claim 1, characterized in that, the upper end of the extension arm (3) is connected with the tilting sash (2) by means of a hinge slide (41) moving in the sash guide (22) along the side member (21) of the frame of this sash, and where the extension arm (3) and the frame of the tilting sash (2), as well as the lever (4) and the hinge slide (41) in that sash are connected together in hinged manner by means of a pivot (31, 42) in one of the joined parts and a seat (27, 43) in the other one, the pivots (31, 42) being secured against self-acting sliding out of the seats (27, 43) by shape locks.
Roof window according to claim 9, characterized in that in the hinged joint of the extension arm (3) with the frame of the tilting sash (2) the pin (31) is set on the extension arm, (3) and the seat (27) is fixed to the frame of that sash, the tilting sash incorporates a safety device for the pin, advantageously in form of a rotary catch (26).
Roof window according to claim 9 or 10, characterized in that in the hinged joint of the upper end of the lever (4), in the hinge mechanism with the hinge slide (41) of that mechanism, there is an open from above seat (43) located in the lever (4), and the mating pivot (42) is set in the hinge slide (41), incorporating also the securing device for that pivot in form of the pin (45), which is transversal versus the lever moving plane, and is inserted into the oblong hole (46) in the lever (4) and locked in that position by a rotary bolt.
Roof window according to any of claims 9-11, characterized in that the sliding extension arm (3), during the initial phase of its movement downwards, raises above the lower member (12) of the window frame (1) and transfers the frame of the tilting sash (2) over that member of the window frame, where, advantageously, the central part of the surface of the extension arm, on the side of the window frame, is a cam (32, which moves on a support, particularly a roller (51), situated at the lower part of the extension arm guide (5) and the upper end of the extension arm (3), when the extension arm (3) approaches its most extended position, moves along a curvilinear section (55) of the extension arm guide (5), on which section the upper end of the extension arm raises above the window frame (1), which causes lowering of the lower end of the extension arm (3), and together with it, of the tilting sash (2).
Roof window according to claim 12, characterized in that the hinge mechanism has an extension arm spring (6) assisting the movement of the extension arm (3) in the extension arm guide (5), and together with it, of the tilting sash (2), where, advantageously, the extension arm spring (6) is put on the mandrel (61) connected with the extension arm (3) in its central part, and the mandrel (61) passes through two movable stops (62, 63), between which the extension arm spring (6) is placed and where the tilting sash (2) incorporates springs cushioning the movement of the hinge slides at positions of that sash, which are near the closed position.
A roof window according to any of claims 9-13, characterized in that in the upper member of the tilting sash (2) there is a hand-rail slide (73) moving along the side member (21) of the frame of that sash, advantageously in the sash guide (22) common with the hinge slide guide (41), where the tilting sash (2) is connected by the hand-rail slide (73) with the hand-rail (7) of the side barrier, the opposite end of which moves in the window frame guide, along the side member (11) of the window frame (1), in which is also mounted the upper sash (8), which overlaps, in its closed state, directly the upper member (25) of the tilting sash (2) and he window frame guide is arranged on the whole length of the side member (11) of the window frame (1), and in the upper part of that guide are firmly set the subassemblies fixing the upper sash in the window frame.
Roof window according to claim 14, characterized in that the upper sash (8) is a double-function one, opened by tilting down about a turning axis located close to the upper zone of that sash, and also opened as a turning one, about a horizontal axis of rotation located in the central zone of that sash.