EP4390028A1 - Roof window with a lifting device - Google Patents
Roof window with a lifting device Download PDFInfo
- Publication number
- EP4390028A1 EP4390028A1 EP23218116.4A EP23218116A EP4390028A1 EP 4390028 A1 EP4390028 A1 EP 4390028A1 EP 23218116 A EP23218116 A EP 23218116A EP 4390028 A1 EP4390028 A1 EP 4390028A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- adjustment
- sledge
- roof window
- wheel
- sash
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
- E05F1/08—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings
- E05F1/10—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance
- E05F1/1041—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring perpendicular to the pivot axis
- E05F1/105—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring perpendicular to the pivot axis with a compression spring
- E05F1/1058—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring perpendicular to the pivot axis with a compression spring for counterbalancing
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/03—Sky-lights; Domes; Ventilating sky-lights
- E04D13/035—Sky-lights; Domes; Ventilating sky-lights characterised by having movable parts
- E04D13/0357—Sky-lights; Domes; Ventilating sky-lights characterised by having movable parts the parts pivoting about an axis supported on a hinged frame or arms
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/03—Sky-lights; Domes; Ventilating sky-lights
- E04D13/035—Sky-lights; Domes; Ventilating sky-lights characterised by having movable parts
- E04D13/0351—Sky-lights; Domes; Ventilating sky-lights characterised by having movable parts the parts pivoting about a fixed axis
- E04D13/0354—Sky-lights; Domes; Ventilating sky-lights characterised by having movable parts the parts pivoting about a fixed axis the parts being flat
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
- E05D15/00—Suspension arrangements for wings
- E05D15/40—Suspension arrangements for wings supported on arms movable in vertical planes
- E05D15/406—Suspension arrangements for wings supported on arms movable in vertical planes with pivoted arms and sliding guides
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
- E05F1/08—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings
- E05F1/10—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance
- E05F1/1041—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring perpendicular to the pivot axis
- E05F1/1066—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring perpendicular to the pivot axis with a traction spring
- E05F1/1075—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring perpendicular to the pivot axis with a traction spring for counterbalancing
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2201/00—Constructional elements; Accessories therefor
- E05Y2201/60—Suspension or transmission members; Accessories therefor
- E05Y2201/622—Suspension or transmission members elements
- E05Y2201/624—Arms
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2201/00—Constructional elements; Accessories therefor
- E05Y2201/60—Suspension or transmission members; Accessories therefor
- E05Y2201/622—Suspension or transmission members elements
- E05Y2201/688—Rollers
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
- E05Y2900/13—Type of wing
- E05Y2900/148—Windows
- E05Y2900/152—Roof windows
Definitions
- the present invention relates to a roof window with a stationary primary frame, at least one secondary frame comprising a sash, and a lifting device comprising a lifting arm inserted between the primary frame and the at least one secondary frame.
- Windows for installation in an inclined roof surface may be provided in a number of varieties and include more or less complicated operational structures to allow opening of the sash and to fulfil other functions, such as ventilation.
- Such roof windows include the type hinged at or near the centre, the top-hinged type, and finally the roof windows that are top-hinged during normal operation but in which the sash is able to perform a rotating movement substantially at a centre axis, either for cleaning or for providing an alternative manner of operation.
- Roof windows of the top-hinged type have a first hinge axis provided by a top hinge arrangement to provide a first operational condition, whereas rotation of the sash in a second operational condition is performed by means of an intermediate frame in which the sash is hinged to provide a secondary hinge axis.
- one hinge of the hinge arrangement will be located at either side of the roof window to define a substantially horizontal hinge axis.
- top-hinged windows with a second operational condition are for instance disclosed in Applicant's WO-A-89/10460 , EP 0 733 146 B1 , EP 1 873 323 B1 , EP 2 762 665 A2 , and WO 2019101281 A1 .
- the sash structure is connected with an intermediate frame with frame arms, which in the closed position of the window are positioned between the upper parts of the frame and sash side members, and which during normal use of the window as a top-hung window follow the sash side members.
- Such a lifting device is for instance disclosed in the Applicant's WO2019/101281 A1 where a spring assembly acts as a force balancing element to the pane-carrying frame by operating on a lifting arm attached to the frame.
- the lifting arm has a first end rotatably connected with a sledge slidably connected with the primary frame in a sledge guide, and a second end connected with the at least one secondary frame.
- the lifting device furthermore comprises a spring assembly configured to be coupled to the sledge.
- the lifting device further comprises an adjustment arm having a first end rotatably connected to the lifting arm and a second end rotatably connected to the sledge guide, wherein the second end of the lifting arm is arranged to move translationally along the secondary frame.
- This arrangement of arms and interconnections of arms with a sledge in a sledge guide provides a comfortable operation of the roof window.
- the lifting arm moves translationally in the sledge guide in the sliding direction of the sledge by having a rotational connection to the sledge at the first end of the lifting arm.
- the second end of the lifting arm moves translationally along the secondary frame. This provides a low-friction opening / closing movement of the roof window.
- the translational movement is to be understood as a displacement of the second end of the lifting arm from a point A to a point B on the secondary frame.
- the translational movement may be rectilinear and/or cyclical.
- the second end of the lifting arm and the secondary frame may have a roller connection via sash wheel.
- Other forms of connection may also be envisioned.
- the second end of the lifting arm and the secondary frame may be connected via a sledge system comprising a sledge and a sledge guide.
- a sash wheel on the second end of the lifting arm provides a minimal friction connection to the secondary frame.
- a sash wheel connection also minimizes the wear and tear on both the secondary frame and the lifting arm.
- the sash wheel is preferably mounted on the lifting arm.
- the lifting arm is further connected to the sledge guide through an adjustment arm which ensures that the lifting arm is securely attached to the sledge guide, while allowing the first end and second of the lifting arm to slide/roll simultaneously.
- the adjustment arm is rotatably attached to the lifting arm at a point between the first end and second end of the lifting arm. This point may be closer to the first end of the lifting arm, or closer to the second end of the lifting arm or substantially half-way between the first end and second end of the lifting arm.
- the adjustment arm can rotate relative to the sledge guide.
- the adjustment arm may be rotatably connected to the sledge guide directly and/or indirectly.
- the adjustment arm may be attached to the sledge guide indirectly through a component separate from the wheel guide, but which is in some manner fixed to the sledge guide, such as a part comprised in the primary frame.
- the lifting arm may further be provided with sliding discs on one side of both sides of the lifting arm towards the sledge guide.
- the sliding discs reduce the distance between the lifting arm and the sledge guide thereby adding stability to the lifting device when the lifting arm travels in the sledge guide.
- the sliding discs may comprise polymer.
- the sliding discs may be fastened to the lifting arm through holes on the lifting arm.
- the sliding discs may be fastened to the lifting arm by an adhesive.
- the sash wheel may be configured to roll on a wheel guide during an opening and/or closing movement of the roof window, the wheel guide being connected to the secondary frame.
- the sash wheel may further cooperate with the wheel guide by magnetic means or other types of engagement.
- the wheel guide provides a suitable track for the sash wheel to move onto.
- the wheel guide may also provide a protective medium between the sash wheel and the secondary frame.
- the wheel guide may be made of steel.
- the wheel guide may be made of the same material as the sash wheel.
- the wheel guide may be fastened to the sash with fastening means such as screws, adhesive or rivets or by formfitting the wheel guide to the sash such that they are structurally interlocked, or any combination of thereof.
- the wheel guide may comprise longitudinal flanges projecting from one or both longitudinal edges of the guide to ensure a stable movement of the wheel on the guide. The flanges may thus form a channel where the sash wheel can move into.
- the lifting arm may be connected to the sash wheel via a sash wheel rivet.
- the sash wheel rivet provides an easy installation of the sash wheel in the lifting arm and a secure operation of the sash wheel.
- the rivet may be made of steel.
- the sash wheel may comprise fibre-reinforced plastic.
- the sash wheel may comprise 25 - 45 %vol glass fibre. Glass fibre in the sash wheel provides enhanced strength with an optimal strength found between 25 - 45 %vol glass fibre.
- the sash wheel may further comprise other types of plastic.
- the sash wheel may comprise metal such as copper or steel and/or an elastic material such as rubber or silicone.
- the sash wheel and/or wheel guide may have fitting serrations. Fitting serrations on the wheel and/or wheel guide provide an enhanced grip and prevents the sash wheel from undesired skidding.
- the sash wheel and/or wheel guide may alternatively comprise a track and an accommodated track wheel. Alternatively or additionally, the sash wheel and/or wheel guide may be provided with rough surfaces for enhanced grip.
- the adjustment arm may be rotatably connected to the sledge guide through an adjustment system.
- the adjustment system provides a mechanism for adjusting the weight of the pane-carrying sash with the force provided by the spring assembly, according to the roof inclination, such that the pane-carrying frame can be balanced in various roof inclinations without modifications to the spring assembly.
- the adjustment arm may be connected to the lifting arm through an adjustment system.
- the adjustment arm and the lifting arm may be connected at an angle ( ⁇ 1 ), wherein the angle ( ⁇ 1 ) assumes a second angle ( ⁇ 2 ) by adjusting the position of the second end of the adjustment arm by means of the adjustment system.
- the change of the angle ( ⁇ 1 ) to a second angle ( ⁇ 2 ) is to be understood as the adjustment arm changing position without movement of the lifting arm.
- an installer may open the window fully after installing the window and adjust the adjustment system according to the roof inclination.
- the adjustment system may provide a balanced sash in roof inclinations preferably in the range of 15° - 65°. Higher roof inclinations may also be accommodated with slight modifications to the lifting device.
- the roof inclination value may be pre-selected on the adjustment system to adapt to a specific roof inclination the roof window is intended to be installed on or can be changed on spot after the window is installed. Balanced is to be understood as the window taking a position between fully opened and fully closed without further opening or closing due to a pull from the spring assembly or from weight of the window, respectively.
- the adjustment system may comprise an adjustment screw.
- the adjustment screw provides a possible mechanism for adjusting the position of the adjustment arm.
- the adjustment screw may be fixed to an adjustment base.
- the adjustment screw can rotate about its longitudinal axis.
- the adjustment base may be fitted in the sledge guide.
- the adjustment screw may be fixed to the sledge guide through the adjustment base.
- the adjustment base may comprise plastic.
- the second end of the adjustment arm is fitted to the adjustment screw such that the adjustment arm travels along the length direction of the adjustment screw when the adjustment screw is screwed upon.
- the adjustment screw may further comprise a cogwheel at one of its ends, preferably at the end located in proximity with the sledge guide when in a mounted position.
- the cogwheel may be adapted to cooperate with the outer geometry of a mechanical tool.
- the adjustment system may further comprise an adjustment bushing, wherein the second end of the adjustment arm is connected to the adjustment screw through the adjustment bushing.
- the adjustment bushing allows for minimum friction connected between the adjustment screw and the adjustment arm. As the adjustment arm is adjusted on the adjustment screw, the angle between the adjustment arm and the lifting arm changes. Simultaneously, the angle between the adjustment arm and the adjustment screw may change.
- the bushing provides a suitable mechanism that allows such a rotation.
- the bushing may comprise a cylindrical or cyclical body engaging with the adjustment screw via a through hole.
- the through hole of the adjustment bushing may have an inner geometry to engage with an outer bushing of the adjustment screw.
- the adjustment bushing may further have at least one end part projecting from the body and configured to engage with a track or a slot on the sledge guide. This track or slot may be called engagement slot.
- the adjustment system may further comprise a disc configured to be in connection with and/or adjacent to the second end of the adjustment arm.
- the disc may further be adjacent and/or connected to the adjustment bushing such that the disc encompasses the body of the adjustment bushing and the end part projects from the disc.
- the sledge guide may further comprise the adjustment slot, wherein the adjustment system is configured to be accommodated in the adjustment slot.
- an adjustment slot may be provided in the sledge guide such that the adjustment bushing and the adjustment arm can be adjusted without colliding with the sledge guide. Additionally, such an adjustment slot may provide a way to visually inspect the adjustment level of the adjustment system by acting as a way to observe the adjustment screw, the adjustment bushing or the adjustment arm. Indications such as numerical values, letters or marks for the adjustment may be provided along the adjustment slot to indicate the position of the adjustment arm on the adjustment screw to the user according to the roof inclination.
- the adjustment slot may be linear.
- the adjustment slot may alternatively be slightly curved.
- the adjustment slot may run in direction that intersect with the direction of the sliding direction of the sledge. It may run in direction that is perpendicular to the sliding direction of the sledge.
- the sledge guide may further comprise a first and a second flange extending in a height direction perpendicular to the longitudinal direction.
- the sledge guide may further comprise a rivet holding the two flanges of the sledge guide firmly together.
- the adjustment bushing may be configured to be engaged with the adjustment slot.
- the adjustment bushing By fitting the adjustment bushing to the adjustment slot, the entire adjustment system is securely fixed in the sledge guide.
- the adjustment bushing will be restricted to travel along the length of the adjustment slot which results in the second end of the adjustment arm being locked to a position along the adjustment slot.
- the adjustment bushing may be used as an indicator for where on the adjustment screw the adjustment arm is positioned.
- the sledge guide may comprise an opening adapted to receive a mechanical tool such as a tip end of a drill bit fitted to the adjustment system.
- a mechanical tool such as a tip end of a drill bit fitted to the adjustment system.
- Such opening may be a through hole or a blind hole on the outer surface of the sledge guide.
- the mechanical tool may be any tool that can provide an adjustment of the adjustment system such that the second end of the adjustment arm is displaced related to the sledge guide through the adjustment system.
- the mechanical tool may be fitted to the adjustment screw of the adjustment system.
- the opening may be provided in the sledge guide.
- the opening may be provided in the sledge guide in a position close to an end of the adjustment screw.
- There may be two or more openings in the sledge guide for receiving a mechanical tool fitted to the adjustment system.
- the adjustment system may best be reached by the installer or user of the window through the opening of the window.
- the same lifting device may be used in both sides of the room window with equally easy access to the adjustment system in both lifting devices.
- the sledge guide may further comprise openings such as holes adapted to receive screws for mounting the sledge guide onto the window frame.
- the roof window may further comprise an insulating glazing unit.
- Two-layer or three-layer glass also known as insulating glazing units (IGUs) have better thermal properties than single layered glass but are usually heavier and more cumbersome to install and lift. Lifting devices are therefore beneficial to use in windows comprising IGUs.
- the sledge may comprise a sledge wheel configured to roll on the sledge guide and/or a runner mounted on the sledge configured to cooperate and/or engage with the sledge guide.
- a sledge wheel may allow steering of the sledge along the length of the sledge guide.
- the sledge wheel may be provided substantially next to the connection between the sledge and the lifting arm.
- the lifting arm may be connected to the sledge through the sledge wheel.
- the sledge wheel may additionally add support for the sledge in the sledge guide.
- the sledge may additionally and/or alternatively be provided with one or more runners.
- the one or more runners mounted on the sledge may provide additional support for the sledge in the sledge guide.
- the runners may be made of a polymer.
- the runners may comprise glass fibre.
- the runner may be configured to be connected to the first end of the lifting arm and be mounted on the sledge.
- the sash wheel may have a diameter of approximately 30 mm.
- a sash wheel with a diameter of approximately 30 mm ensures that the sash wheel runs on the secondary frame in a stable manner.
- a sash wheel of approximately 30 mm in diameter also fits well in the lifting arm without colliding with other features.
- the lifting arm may be dimensioned accordingly.
- a sash wheel of approximately 20 mm in diameter may also be implemented.
- a sash wheel of approximately 40 mm may be further implemented.
- the sash wheel may have one or more cavities or apertures.
- the sash wheel may have a substantially round shape.
- the cavities may be positioned along the periphery of the round sash wheel and may be equally spaced with each other.
- the sash wheel may be optimised with regards to weight, material usage and strength.
- a series of cavities may be provided in the sash wheel.
- Such cavities may be provided through a topology optimization algorithm.
- the sash wheel may be moulded.
- the sash wheel may be provided as a one-piece. Moulding the sash wheel provides an easy manufacturing of the wheel while allowing incorporation of cavities and serrations.
- a roof window 100 is shown.
- the roof window 100 is intended to be installed in an inclined roof surface (not shown).
- the roof window 100 comprises a primary frame 1, a secondary frame such as a sash 2, and a pane 4.
- a secondary frame such as a sash 2, and a pane 4.
- the primary frame 1 comprises a set of frame members including a top frame member, two side frame members and a bottom frame member.
- the sash 2 comprises a set of sash members including a top sash member, two side sash members and a bottom sash member. While the primary frame 1 and sash 2 are described as rectangular structures, some principles of the presented concepts may be applicable to other geometrical shapes as well.
- the pane 4 comprises a number of edge portions generally associated to members of the sash 2 as will be described in further detail below.
- An exterior pane surface 4e defines a plane of the roof window 100 in an assembled condition of the roof window 100.
- the assembled condition of the roof window 100 is achieved when main components of the primary frame 1 and sash 2 have been assembled and the primary frame 1 and sash 2 are connected to each other, for instance in an installed position when the roof window 100 is ready for use.
- an assembled condition of the sash 2 is achieved once main components of the sash 2 have been assembled, and an assembled condition of the primary frame 1 when main components of the primary frame 1 are assembled.
- main components is to be understood as encompassing primary parts of the roof window necessary to perform all operational functions, and not including accessories or auxiliary equipment.
- An interior pane surface 4i faces the interior, typically a room of a building subjacent the roof surface in which the roof window 100 is installed.
- the sash 2 is openable relative to the primary frame 1, to obtain one or more open positions. In such open positions, the sash 2 and pane 4 are moved out of the plane of the roof window 1.
- the sash 2 is shown as being top hung, i.e. during normal use, the sash 2 is rotated about a substantially horizontal hinge axis at or near the top frame member and top sash member. It is however conceivable to apply some principles of the presented concepts for roof windows on different types of windows having other opening patterns, or being provided as fixed skylights.
- FIG 1A Further details shown in Fig 1A include an operating assembly, here shown as a handle. Other operating assemblies may be present as well.
- a representative mounting bracket forming part of a plurality of mounting brackets forming a load-transferring connection between the roof window 100 and a surrounding roof structure (not shown).
- a roof structure may include rafters and battens, plywood or other construction materials.
- Insulation by an insulating frame is optional and may be provided along only some of the frame members or as shown surrounding all four frame members.
- the roof window 100 furthermore comprises a hinge assembly.
- the hinge assembly is configured in such a way that it allows the sash 2 to be top hung in a first operational condition corresponding to normal use. That is, during normal use the sash 2 is rotated about a substantially horizontal first hinge axis at or near the top frame member and top sash member between a closed position and an open position.
- Fig. 2 shows a lifting device 10 installed in a roof window 100 with a primary frame 1 and a sash 2.
- the lifting device is installed between the primary frame 1 and the sash 2 and comprises a sledge guide 16 fixed to the primary frame 1 and a lifting arm 14 with a first end 12 rotatably connected or fixed to a sledge 30 sliding in the sledge guide 16.
- a sash wheel 40 is attached to the lifting arm 14.
- the connection between the sash 2 and the lifting arm 14 is shown as a sash wheel 40 attached to the lifting arm 14 by means of a wheel rivet 42.
- the sash wheel 40 is therefore in a rolling connection with the sash 2 by means of the sash wheel 40.
- the sash wheel 40 is configured to roll on a wheel guide 41.
- the wheel guide 41 acts as a rail for the sash wheel during opening and closing of the window.
- the wheel guide 41 also provides protection for the sash 2 as the sash wheel rolls on the sash 2 during opening and closing of the roof window.
- the lifting arm 14 is also attached to the sledge guide 16 through an adjustment arm 52.
- the adjustment arm 52 is at one end rotatably attached to lifting arm 14.
- the adjustment arm 52 is attached to the lifting arm 14 at a point approximately equally distanced between the first end 12 of the lifting arm 14 and the second end 13 of the lifting arm.
- the adjustment arm 52 can in other embodiments be rotatably attached to the lifting arm at a point closer towards the first end 12 of the lifting arm 14 or at a point closer towards the second end 13 of the lifting arm 14.
- the adjustment arm 52 is connected to the sledge guide 16 through an adjustment system 50, which will be described further below.
- the adjustment arm 52 may in other embodiments be rotatably attached to the sledge guide directly.
- the sledge 30 is attached to a spring assembly 20 which is arranged to exert a force on the sledge 30.
- the sledge 30 may be uncoupled from the spring assembly 20. This may, as an example, be an advantage during installation of the roof window where a spring force acting on the sledge 30 may make it difficult to handle the roof window.
- the sledge 30 and the spring assembly 20 are initially in an uncoupled state as shown in Fig. 3A .
- the spring assembly 20 and the sledge 30 are then coupled by opening the roof window resulting in the sledge 30 sliding towards a coupling device such as a hook attached to a spring comprised in the spring assembly 20.
- Opening the roof window results in the sledge 30 engaging with the hook, as shown in Fig. 3B , and once the roof window is subsequently closed, the sledge 30 will slide back in a direction away from the spring assembly 20 and the spring now coupled to the sledge 30 will exert a pulling force on the sledge 30 and provide a resistance against the closing of the roof window.
- the pulling force of the spring and the weight of the roof window are preferably balanced such that the roof window can be positioned in an open position without closing due to its own weight or opening further due to the pull from the spring in the spring assembly. This balance is also influenced by the inclination of the roof that the roof window is installed in.
- the spring in the spring assembly 30 may be adjusted to balance the roof window in a specific roof inclination.
- the spring force acting on the sledge will not be balanced to the weight of the window.
- the spring may exert too much force on the window thereby forcing the window to open further.
- the spring may be too weak, and the window will close due to its own weight. In both cases, the window is difficult for the user to operate and potentially hazardous.
- an adjustment system as shown in Figs. 2 - 3 and 6 - 11 may be used. In these embodiments, the adjustment system is installed to adjust the position of the second end of the adjustment arm 52 in the sledge guide 16.
- the adjustment system 50 is instead installed in the lifting arm 14 such that the first end of the adjustment arm is attached to the lifting arm 14 through an adjustment system and the second end of the adjustment arm is attached to the sledge guide.
- a sliding disc 43 on the lifting arm 14 is present.
- a further sliding disc may be arranged on the other side of the lifting arm 14 as well. The sliding disc reduces the distance to the sledge guide 16 and adds stability to the lifting arm as it travels from an open to a closed position or vice versa.
- An adjustment arm rivet 57 - better shown in Fig. 3B - connects the lifting arm 14 to the adjustment arm 52 firmly, while enabling their rotational movement with respect to each other.
- Fig. 4 shows a sash wheel 40 in a wheel guide 41 where the wheel guide 41 is provided with longitudinal flanges projecting from both longitudinal edges of the wheel guide thereby forming a channel which the sash wheel 40 can move in.
- Fig. 5 shows an alternative embodiment of the lifting device 10 where the wheel guide 41 is configured as a plate.
- the second end of the lifting arm may also comprise flanges that surround the sash wheel or part of the sash wheel, as shown in Fig. 5 .
- Figs. 6 and 7 each shows a part of the lifting device with the lifting arm 14 extending upwards and away from the sledge 30.
- the lifting arm 14 comprises a first lifting arm 141 and a second lifting arm 142 with the two lifting arms 141, 142 arranged on opposite sides of the adjustment arm 52.
- the two lifting arms 141, 142 are preferably similarly shaped with both the sash wheel and adjustment arm arranged between the two lifting arms 141, 142.
- the wheel rivet 42 displayed in Figs. 4 and 5 may be used as means to keep the two lifting arms 141, 142 fixed to each other. Other means may also be used to keep the two lifting arms 141, 142 fixed to each other.
- the two lifting arms 141, 142 may be fixed to each other through the attachment to the adjustment arm 52 and through the attachment to the sledge 30. Each of these means of fixing the two lifting arms to each other may be used in combination or individually.
- the adjustment arm 52 comprises a first adjustment arm 521 and a second adjustment arm 522.
- the two lifting arms 141, 142 are symmetrically arranged with regards to a central plane P, shown in Fig. 9 .
- the two adjustment arms 521, 522 are symmetrically arranged with regards to the central plane P.
- Figs. 6 and 7 additionally show the adjustment system 50.
- Fig. 6 particularly shows an adjustment slot 55 with an adjustment bushing 54 engaged with the adjustment slot 55.
- the adjustment slot 55 is a linear slit -in the form of a track- on an outer part of the sledge guide 16 limiting the adjustment bushing 54 and thereby the adjustment arm 52 to travel in a linear direction in the adjustment slot 55.
- the adjustment slot 55 may alternatively be slightly curved such that the adjustment arm 52 travels in a semi-circle.
- the longitudinal direction of the adjustment slot 55 may additionally or alternatively be arranged in a direction substantially in parallel with the sliding direction of the sledge.
- the longitudinal direction of the adjustment slot 55 may in other embodiments travel in a direction that is perpendicular to the sliding direction of the sledge 30 in the sledge guide 16.
- Fig. 7 shows a sledge guide rivet 58 for added stability of the lifting device 10.
- the sledge guide rivet 58 locks the two sides of the sledge guide to each other and simultaneously ensure that the adjustment system also shown in Fig. 7 is kept in place.
- Fig. 8 shows a lifting device 10 for a roof window from a top perspective view. It is clearly shown that in this embodiment the first and the second adjustment arms 521, 522 are distanced and separated from each other at their attachment to the adjustment system 50, but are attached to each to other at a point located close to their attachment to the adjustment system 50 and up until their attachment to the lifting arms 141, 142. Alternatively, the adjustment arms 521, 522 may each have a longer inclined portion and an attachment point closer to the attachment to the lifting arm.
- Fig. 9 shows a perspective view of the lifting device in an open position, where a central plane P is illustrated.
- the imaginary central plane P extends in a longitudinal or length direction L and height direction H and is defined as the plane where the respective forces exerted by the lifting arm and the adjustment arm are balanced.
- the central plane P intersects the sledge guide 16 in the middle of the width of the sledge guide 16.
- the width is defined as extending in the width direction, the width direction being perpendicular to the length direction.
- the two lifting arms 141, 142 are therefore symmetrically arranged with respect to a central plane P.
- the sledge guide is shown as extending along the length direction that defines the central plane P.
- the lifting device is shown in an open position and the lifting arm extends substantially in the height direction in this open position.
- the lifting arm When the lifting device 10 is in the closed position, such as shown in Fig. 3A , the lifting arm extends substantially along the length direction together with the sledge guide.
- the two adjustment arms 521, 522 are symmetrically arranged with respect to the central plane P.
- the two lifting arms 141, 142 are positioned such that the forces exerted by the lifting arm 14 onto the central plane P are balanced.
- the sledge guide 16 is symmetrical with respect to the central plane P.
- the lifting arm 14 comprises a first lifting arm 141 and a second lifting arm 142 arranged symmetrically with respect to the central plane P.
- Figs. 10 and 11 show a lifting device from a side view.
- the adjustment arm 52 is adjusted such that its second end is in a position creating an angle ⁇ 1 between the lifting arm 14 and the adjustment arm when the window is in an open position.
- the roof window is in the same open position as in Fig. 10 and the second end of the adjustment arm 52 is adjusted such that the angle between the adjustment arm 52 and the lifting arm 14 is an angle ⁇ 2 .
- the adjustment arm 52 can be adjusted by means of a mechanical tool 60 such as a drill bit fitted and rotated into an opening 161 in the sledge guide 16 of the lifting device 10, also shown in Figs 2 , 3 .
- the adjustment arm 52 shown in Fig. 10 is arranged for a roof window installed in a roof with an inclination of approximately 65°
- the roof window shown in Fig. 11 is arranged for a roof window installed in a roof with an inclination of approximately 15°.
- the adjustment arm 52 By adjusting the adjustment arm 52 to a position in between these two extremes the forces can be balanced for roof inclinations varying in the range of 15° to 65°.
- the adjustment system may also adjust the lifting device to operate smoothly in roof windows installed in lower or higher roof inclinations, such as 10° or 70°.
- Figs. 12A - 12B show an example of how a mechanical tool and an adjustment system may interact.
- a mechanical tool 60 is shown to fit into the opening 161 in the sledge guide 16.
- the mechanical tool 60 has a drill bit fitted to the adjustment screw 53.
- Fig. 12A shows how an adjustment bushing 52 may be fitted onto the adjustment screw 52.
- Fig. 12A also shows how the adjustment bushing 52 is fitted to an adjustment slot 55.
- the adjustment slot 55 has indications showing what roof inclination the adjustment system 50 is adjusted for.
- the adjustment system 50 is adjusted to a roof inclination of approximately 15°.
- the adjustment system 50 is adjusted to a roof inclination of approximately 65°.
- Fig. 12B it is shown how the adjustment arm 52 may be connected to the adjustment bushing 52.
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Abstract
In the roof window (100), the lifting device (10) further comprises a lifting arm (14) inserted between the primary frame (1) and the at least one secondary frame (2). The lifting arm (14) has a first end (12) rotatably connected with a sledge (30) slidably connected with the primary frame (1) in a sledge guide (16) and a second end (13) rotatably connected with the at least one secondary frame (2). The lifting device (10) further comprises a spring assembly (20) configured to be coupled to the sledge (30).
Description
- The present invention relates to a roof window with a stationary primary frame, at least one secondary frame comprising a sash, and a lifting device comprising a lifting arm inserted between the primary frame and the at least one secondary frame.
- Windows for installation in an inclined roof surface may be provided in a number of varieties and include more or less complicated operational structures to allow opening of the sash and to fulfil other functions, such as ventilation. Such roof windows include the type hinged at or near the centre, the top-hinged type, and finally the roof windows that are top-hinged during normal operation but in which the sash is able to perform a rotating movement substantially at a centre axis, either for cleaning or for providing an alternative manner of operation. Roof windows of the top-hinged type have a first hinge axis provided by a top hinge arrangement to provide a first operational condition, whereas rotation of the sash in a second operational condition is performed by means of an intermediate frame in which the sash is hinged to provide a secondary hinge axis. Typically, one hinge of the hinge arrangement will be located at either side of the roof window to define a substantially horizontal hinge axis.
- Examples of top-hinged windows with a second operational condition are for instance disclosed in Applicant's
WO-A-89/10460 EP 0 733 146 B1EP 1 873 323 B1 ,EP 2 762 665 A2WO 2019101281 A1 . To make it possible to rotate the window sash approximately 180° to 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 positioned between the upper parts of the frame and sash side members, and which during normal use of the window as a top-hung window follow the sash side members. - In roof windows in which the operation takes place either entirely or partially about a hinge axis at the top, it is known to balance at least part of the weight of the movable components by means of a lifting device. The purpose of this arrangement is to facilitate opening the window, and the dimensions may be chosen so that a spring can retain the top-hinged frame in equilibrium in a desired opening position.
- Such a lifting device is for instance disclosed in the Applicant's
WO2019/101281 A1 where a spring assembly acts as a force balancing element to the pane-carrying frame by operating on a lifting arm attached to the frame. - However, although the lifting device in the above example is to some extent capable of providing the desired force balance, there is still room for improvement.
- With this background it is an object of the present invention to provide a roof window with a lifting device having an increased design flexibility allowing the desired movement pattern and ease of operability.
- This is achieved with a roof window of the kind mentioned in the introduction, which is further characterised in that the lifting arm has a first end rotatably connected with a sledge slidably connected with the primary frame in a sledge guide, and a second end connected with the at least one secondary frame. The lifting device furthermore comprises a spring assembly configured to be coupled to the sledge. The lifting device further comprises an adjustment arm having a first end rotatably connected to the lifting arm and a second end rotatably connected to the sledge guide, wherein the second end of the lifting arm is arranged to move translationally along the secondary frame.
- This arrangement of arms and interconnections of arms with a sledge in a sledge guide provides a comfortable operation of the roof window. During opening and closing of the roof window, the lifting arm moves translationally in the sledge guide in the sliding direction of the sledge by having a rotational connection to the sledge at the first end of the lifting arm. At the same time, the second end of the lifting arm moves translationally along the secondary frame. This provides a low-friction opening / closing movement of the roof window. The translational movement is to be understood as a displacement of the second end of the lifting arm from a point A to a point B on the secondary frame. The translational movement may be rectilinear and/or cyclical.
- The second end of the lifting arm and the secondary frame may have a roller connection via sash wheel. Other forms of connection may also be envisioned. The second end of the lifting arm and the secondary frame may be connected via a sledge system comprising a sledge and a sledge guide. A sash wheel on the second end of the lifting arm provides a minimal friction connection to the secondary frame. A sash wheel connection also minimizes the wear and tear on both the secondary frame and the lifting arm.
- Furthermore, it provides the opportunity of lifting the secondary frame from the lifting device which provides a more dynamic use of the roof window for example during maintenance or reparation of the roof window.
- The sash wheel is preferably mounted on the lifting arm.
- The lifting arm is further connected to the sledge guide through an adjustment arm which ensures that the lifting arm is securely attached to the sledge guide, while allowing the first end and second of the lifting arm to slide/roll simultaneously. The adjustment arm is rotatably attached to the lifting arm at a point between the first end and second end of the lifting arm. This point may be closer to the first end of the lifting arm, or closer to the second end of the lifting arm or substantially half-way between the first end and second end of the lifting arm. Generally, the adjustment arm can rotate relative to the sledge guide. The adjustment arm may be rotatably connected to the sledge guide directly and/or indirectly. The adjustment arm may be attached to the sledge guide indirectly through a component separate from the wheel guide, but which is in some manner fixed to the sledge guide, such as a part comprised in the primary frame.
- The lifting arm may further be provided with sliding discs on one side of both sides of the lifting arm towards the sledge guide. The sliding discs reduce the distance between the lifting arm and the sledge guide thereby adding stability to the lifting device when the lifting arm travels in the sledge guide. The sliding discs may comprise polymer. The sliding discs may be fastened to the lifting arm through holes on the lifting arm. The sliding discs may be fastened to the lifting arm by an adhesive.
- The sash wheel may be configured to roll on a wheel guide during an opening and/or closing movement of the roof window, the wheel guide being connected to the secondary frame. The sash wheel may further cooperate with the wheel guide by magnetic means or other types of engagement.
- The wheel guide provides a suitable track for the sash wheel to move onto. The wheel guide may also provide a protective medium between the sash wheel and the secondary frame. The wheel guide may be made of steel. The wheel guide may be made of the same material as the sash wheel. The wheel guide may be fastened to the sash with fastening means such as screws, adhesive or rivets or by formfitting the wheel guide to the sash such that they are structurally interlocked, or any combination of thereof. The wheel guide may comprise longitudinal flanges projecting from one or both longitudinal edges of the guide to ensure a stable movement of the wheel on the guide. The flanges may thus form a channel where the sash wheel can move into.
- The lifting arm may be connected to the sash wheel via a sash wheel rivet.
The sash wheel rivet provides an easy installation of the sash wheel in the lifting arm and a secure operation of the sash wheel. The rivet may be made of steel. - The sash wheel may comprise fibre-reinforced plastic. The sash wheel may comprise 25 - 45 %vol glass fibre.
Glass fibre in the sash wheel provides enhanced strength with an optimal strength found between 25 - 45 %vol glass fibre. The sash wheel may further comprise other types of plastic. Alternatively, the sash wheel may comprise metal such as copper or steel and/or an elastic material such as rubber or silicone. - The sash wheel and/or wheel guide may have fitting serrations.
Fitting serrations on the wheel and/or wheel guide provide an enhanced grip and prevents the sash wheel from undesired skidding. The sash wheel and/or wheel guide may alternatively comprise a track and an accommodated track wheel. Alternatively or additionally, the sash wheel and/or wheel guide may be provided with rough surfaces for enhanced grip.
The adjustment arm may be rotatably connected to the sledge guide through an adjustment system. - The adjustment system provides a mechanism for adjusting the weight of the pane-carrying sash with the force provided by the spring assembly, according to the roof inclination, such that the pane-carrying frame can be balanced in various roof inclinations without modifications to the spring assembly. Alternatively, the adjustment arm may be connected to the lifting arm through an adjustment system.
The adjustment arm and the lifting arm may be connected at an angle (α1), wherein the angle (α1) assumes a second angle (α2) by adjusting the position of the second end of the adjustment arm by means of the adjustment system. - The change of the angle (α1) to a second angle (α2) is to be understood as the adjustment arm changing position without movement of the lifting arm. Thus, an installer may open the window fully after installing the window and adjust the adjustment system according to the roof inclination. The adjustment system may provide a balanced sash in roof inclinations preferably in the range of 15° - 65°. Higher roof inclinations may also be accommodated with slight modifications to the lifting device. The roof inclination value may be pre-selected on the adjustment system to adapt to a specific roof inclination the roof window is intended to be installed on or can be changed on spot after the window is installed. Balanced is to be understood as the window taking a position between fully opened and fully closed without further opening or closing due to a pull from the spring assembly or from weight of the window, respectively.
- The adjustment system may comprise an adjustment screw.
The adjustment screw provides a possible mechanism for adjusting the position of the adjustment arm. The adjustment screw may be fixed to an adjustment base. The adjustment screw can rotate about its longitudinal axis. The adjustment base may be fitted in the sledge guide. Alternatively, the adjustment screw may be fixed to the sledge guide through the adjustment base. The adjustment base may comprise plastic. - The second end of the adjustment arm is fitted to the adjustment screw such that the adjustment arm travels along the length direction of the adjustment screw when the adjustment screw is screwed upon. The adjustment screw may further comprise a cogwheel at one of its ends, preferably at the end located in proximity with the sledge guide when in a mounted position. The cogwheel may be adapted to cooperate with the outer geometry of a mechanical tool.
- The adjustment system may further comprise an adjustment bushing, wherein the second end of the adjustment arm is connected to the adjustment screw through the adjustment bushing. The adjustment bushing allows for minimum friction connected between the adjustment screw and the adjustment arm. As the adjustment arm is adjusted on the adjustment screw, the angle between the adjustment arm and the lifting arm changes. Simultaneously, the angle between the adjustment arm and the adjustment screw may change. The bushing provides a suitable mechanism that allows such a rotation.
- The bushing may comprise a cylindrical or cyclical body engaging with the adjustment screw via a through hole. The through hole of the adjustment bushing may have an inner geometry to engage with an outer bushing of the adjustment screw. The adjustment bushing may further have at least one end part projecting from the body and configured to engage with a track or a slot on the sledge guide. This track or slot may be called engagement slot.
- The adjustment system may further comprise a disc configured to be in connection with and/or adjacent to the second end of the adjustment arm. The disc may further be adjacent and/or connected to the adjustment bushing such that the disc encompasses the body of the adjustment bushing and the end part projects from the disc.
- The sledge guide may further comprise the adjustment slot, wherein the adjustment system is configured to be accommodated in the adjustment slot.
- In order for the adjustment arm to travel along the adjustment screw an adjustment slot may be provided in the sledge guide such that the adjustment bushing and the adjustment arm can be adjusted without colliding with the sledge guide. Additionally, such an adjustment slot may provide a way to visually inspect the adjustment level of the adjustment system by acting as a way to observe the adjustment screw, the adjustment bushing or the adjustment arm. Indications such as numerical values, letters or marks for the adjustment may be provided along the adjustment slot to indicate the position of the adjustment arm on the adjustment screw to the user according to the roof inclination. The adjustment slot may be linear. The adjustment slot may alternatively be slightly curved. The adjustment slot may run in direction that intersect with the direction of the sliding direction of the sledge. It may run in direction that is perpendicular to the sliding direction of the sledge.
- The sledge guide may further comprise a first and a second flange extending in a height direction perpendicular to the longitudinal direction. The sledge guide may further comprise a rivet holding the two flanges of the sledge guide firmly together.
- The adjustment bushing may be configured to be engaged with the adjustment slot.
- By fitting the adjustment bushing to the adjustment slot, the entire adjustment system is securely fixed in the sledge guide. The adjustment bushing will be restricted to travel along the length of the adjustment slot which results in the second end of the adjustment arm being locked to a position along the adjustment slot. Furthermore, by engaging the adjustment bushing with the adjustment slot, the adjustment bushing may be used as an indicator for where on the adjustment screw the adjustment arm is positioned.
- The sledge guide may comprise an opening adapted to receive a mechanical tool such as a tip end of a drill bit fitted to the adjustment system. Such opening may be a through hole or a blind hole on the outer surface of the sledge guide. The mechanical tool may be any tool that can provide an adjustment of the adjustment system such that the second end of the adjustment arm is displaced related to the sledge guide through the adjustment system. The mechanical tool may be fitted to the adjustment screw of the adjustment system.
- This may provide an easy adjustment method of the roof window that can be done with common tools available to a person installing a window. The opening may be provided in the sledge guide. The opening may be provided in the sledge guide in a position close to an end of the adjustment screw. There may be two or more openings in the sledge guide for receiving a mechanical tool fitted to the adjustment system. There may be such openings provided symmetrically on two sides of the sledge guide. This makes it possible to install the lifting device in more than one position and still being able to access the adjustment system in case one opening is blocked. It may be envisioned that the lifting device is provided in both sides of the roof window. In a case where the roof window has been installed in a roof of a building, the adjustment system may best be reached by the installer or user of the window through the opening of the window. In such a case the same lifting device may be used in both sides of the room window with equally easy access to the adjustment system in both lifting devices.
- The sledge guide may further comprise openings such as holes adapted to receive screws for mounting the sledge guide onto the window frame.
- The roof window may further comprise an insulating glazing unit. Two-layer or three-layer glass also known as insulating glazing units (IGUs) have better thermal properties than single layered glass but are usually heavier and more cumbersome to install and lift. Lifting devices are therefore beneficial to use in windows comprising IGUs. The sledge may comprise a sledge wheel configured to roll on the sledge guide and/or a runner mounted on the sledge configured to cooperate and/or engage with the sledge guide.
- A sledge wheel may allow steering of the sledge along the length of the sledge guide. The sledge wheel may be provided substantially next to the connection between the sledge and the lifting arm. The lifting arm may be connected to the sledge through the sledge wheel. By providing the sledge wheel close to the lifting arm, a greater stability of the sledge is achieved.
- The sledge wheel may additionally add support for the sledge in the sledge guide. The sledge may additionally and/or alternatively be provided with one or more runners. The one or more runners mounted on the sledge may provide additional support for the sledge in the sledge guide. The runners may be made of a polymer. The runners may comprise glass fibre. The runner may be configured to be connected to the first end of the lifting arm and be mounted on the sledge.
- The sash wheel may have a diameter of approximately 30 mm. A sash wheel with a diameter of approximately 30 mm ensures that the sash wheel runs on the secondary frame in a stable manner. A sash wheel of approximately 30 mm in diameter also fits well in the lifting arm without colliding with other features. The lifting arm may be dimensioned accordingly. A sash wheel of approximately 20 mm in diameter may also be implemented. A sash wheel of approximately 40 mm may be further implemented.
- The sash wheel may have one or more cavities or apertures. The sash wheel may have a substantially round shape. The cavities may be positioned along the periphery of the round sash wheel and may be equally spaced with each other.
- The sash wheel may be optimised with regards to weight, material usage and strength. Thus, a series of cavities may be provided in the sash wheel. Such cavities may be provided through a topology optimization algorithm.
- The sash wheel may be moulded. The sash wheel may be provided as a one-piece. Moulding the sash wheel provides an easy manufacturing of the wheel while allowing incorporation of cavities and serrations.
- Other presently preferred embodiments and further advantages will be apparent from the subsequent detailed description and drawings.
- In the following description, embodiments of the invention will be described with reference to the drawings, in which
-
Fig. 1A is a perspective view of a roof window in an embodiment of the invention, seen from an interior side; -
Fig. 1B is perspective of the roof window ofFig. 1A , seen from an exterior side; -
Fig. 1C is a perspective cross-sectional view of a roof window in another embodiment, with the sash in an open position. -
Fig. 2 is a perspective view of a lifting device for a roof window in an embodiment according to the invention in a first operational condition. -
Fig. 3A is a side view of a lifting device for a roof window in an embodiment according to the invention in a closed position of the window and with the sledge unattached to the spring assembly. -
Fig. 3B is a side view of a lifting device for a roof window in an embodiment according to the invention in an open position of the window and with the sledge attached to the spring assembly. -
Fig. 4 is a close-up perspective view of a lifting device for a roof window in an embodiment according to the invention showing the sash wheel mounted in a lifting arm and in connection with a wheel guide. -
Fig. 5 is close-up perspective view of a lifting device for a roof window in another embodiment according to the invention showing the sash wheel mounted in a lifting arm and in connection with a wheel guide. -
Fig. 6 is a close-up perspective view of a lifting device for a roof window in an embodiment according to the invention showing part of a sledge guide, an adjustment arm and lifting arm and how these are connected. -
Fig. 7 is a close-up perspective view of a lifting device for a roof window in an embodiment according to the invention showing part of a sledge guide, an adjustment arm and lifting arm and how these are connected from another angle. -
Fig. 8 is a close-up perspective view of a lifting device for a roof window in an embodiment according to the invention showing part of a sledge guide, an adjustment arm and lifting arm and how these are connected from another angle. -
Fig. 9 is a perspective view of a lifting device for a roof window in an embodiment according to the invention showing the central plane P. -
Fig. 10 is a side view of a lifting device for a roof window in an embodiment according to the invention in one operational condition where the adjustment arm is adjusted at an angle α1 in relation to the lifting arm. -
Fig. 11 is a side view of a lifting device for a roof window in an embodiment according to the invention in another operational condition where the adjustment arm is adjusted to an angle α2 in relation to the lifting arm by introducing a tip end of a mechanical tool such as a drill bit into an opening in the sledge guide, where the drill bit is fitted to an adjustment screw connected to the adjustment arm. -
Fig. 12A shows a mechanical tool interacting with an adjustment system for a lifting device for a roof window in an embodiment according to the invention adjusted for a specific roof inclination. -
Fig. 12B shows a mechanical tool interacting with an adjustment system for a lifting device for a roof window in an embodiment according to the invention adjusted for a roof inclination different from the one shown inFig. 12A . - In the following, embodiments of the lifting device and roof window will be described in further detail. When referring to the Figures, the terms up, down, upwards, downwards, top and bottom are taken relative to how the figures are displayed. A front view is taken from the hinge and viewing towards the window frame. A view from behind is therefore taken as viewed from the frame towards the hinge. A longitudinal direction is, if nothing else is mentioned, longitudinal along the length of a member. It is to be understood that the arrangement shown in a horizontal orientation is not the normal orientation as the window is installed on an inclined roof.
- Referring initially to
Figs 1A and1B , aroof window 100 is shown. Theroof window 100 is intended to be installed in an inclined roof surface (not shown). - The
roof window 100 comprises aprimary frame 1, a secondary frame such as asash 2, and apane 4. In the shown embodiment only one secondary frame is present; however, a further secondary frame in form of an intermediate frame may be provided, which is well-known from roof windows that are top-hinged during normal use but which pivot for cleaning. Theprimary frame 1 comprises a set of frame members including a top frame member, two side frame members and a bottom frame member. Correspondingly, thesash 2 comprises a set of sash members including a top sash member, two side sash members and a bottom sash member. While theprimary frame 1 andsash 2 are described as rectangular structures, some principles of the presented concepts may be applicable to other geometrical shapes as well. - The
pane 4 comprises a number of edge portions generally associated to members of thesash 2 as will be described in further detail below. Anexterior pane surface 4e defines a plane of theroof window 100 in an assembled condition of theroof window 100. The assembled condition of theroof window 100 is achieved when main components of theprimary frame 1 andsash 2 have been assembled and theprimary frame 1 andsash 2 are connected to each other, for instance in an installed position when theroof window 100 is ready for use. Correspondingly, an assembled condition of thesash 2 is achieved once main components of thesash 2 have been assembled, and an assembled condition of theprimary frame 1 when main components of theprimary frame 1 are assembled. The term "main components" is to be understood as encompassing primary parts of the roof window necessary to perform all operational functions, and not including accessories or auxiliary equipment. - An
interior pane surface 4i faces the interior, typically a room of a building subjacent the roof surface in which theroof window 100 is installed. - In the embodiments shown, the
sash 2 is openable relative to theprimary frame 1, to obtain one or more open positions. In such open positions, thesash 2 andpane 4 are moved out of the plane of theroof window 1. As will be described in the following, thesash 2 is shown as being top hung, i.e. during normal use, thesash 2 is rotated about a substantially horizontal hinge axis at or near the top frame member and top sash member. It is however conceivable to apply some principles of the presented concepts for roof windows on different types of windows having other opening patterns, or being provided as fixed skylights. - Further details shown in
Fig 1A include an operating assembly, here shown as a handle. Other operating assemblies may be present as well. - Also shown is a representative mounting bracket forming part of a plurality of mounting brackets forming a load-transferring connection between the
roof window 100 and a surrounding roof structure (not shown). Such a roof structure may include rafters and battens, plywood or other construction materials. - An insulating frame is shown. Insulation by an insulating frame is optional and may be provided along only some of the frame members or as shown surrounding all four frame members.
- Referring to
Fig. 1C it is shown that theroof window 100 furthermore comprises a hinge assembly. - The hinge assembly is configured in such a way that it allows the
sash 2 to be top hung in a first operational condition corresponding to normal use. That is, during normal use thesash 2 is rotated about a substantially horizontal first hinge axis at or near the top frame member and top sash member between a closed position and an open position. -
Fig. 2 shows alifting device 10 installed in aroof window 100 with aprimary frame 1 and asash 2. The lifting device is installed between theprimary frame 1 and thesash 2 and comprises asledge guide 16 fixed to theprimary frame 1 and a liftingarm 14 with afirst end 12 rotatably connected or fixed to asledge 30 sliding in thesledge guide 16. At asecond end 13 of the liftingarm 14, asash wheel 40 is attached to the liftingarm 14. InFig. 2 the connection between thesash 2 and the liftingarm 14 is shown as asash wheel 40 attached to the liftingarm 14 by means of awheel rivet 42. Thesash wheel 40 is therefore in a rolling connection with thesash 2 by means of thesash wheel 40. Other means of attachment may be envisioned. In the embodiment shown inFig. 2 thesash wheel 40 is configured to roll on awheel guide 41. The wheel guide 41 acts as a rail for the sash wheel during opening and closing of the window. Thewheel guide 41 also provides protection for thesash 2 as the sash wheel rolls on thesash 2 during opening and closing of the roof window. The liftingarm 14 is also attached to thesledge guide 16 through anadjustment arm 52. Theadjustment arm 52 is at one end rotatably attached to liftingarm 14. InFig. 2 theadjustment arm 52 is attached to the liftingarm 14 at a point approximately equally distanced between thefirst end 12 of the liftingarm 14 and thesecond end 13 of the lifting arm. Theadjustment arm 52 can in other embodiments be rotatably attached to the lifting arm at a point closer towards thefirst end 12 of the liftingarm 14 or at a point closer towards thesecond end 13 of the liftingarm 14. InFig. 2 theadjustment arm 52 is connected to thesledge guide 16 through anadjustment system 50, which will be described further below. Theadjustment arm 52 may in other embodiments be rotatably attached to the sledge guide directly. - The
sledge 30 is attached to aspring assembly 20 which is arranged to exert a force on thesledge 30. As detailed inFig. 3A thesledge 30 may be uncoupled from thespring assembly 20. This may, as an example, be an advantage during installation of the roof window where a spring force acting on thesledge 30 may make it difficult to handle the roof window. In the cases where the lifting device is installed in the roof window according to its intended use, thesledge 30 and thespring assembly 20 are initially in an uncoupled state as shown inFig. 3A . Thespring assembly 20 and thesledge 30 are then coupled by opening the roof window resulting in thesledge 30 sliding towards a coupling device such as a hook attached to a spring comprised in thespring assembly 20. Opening the roof window results in thesledge 30 engaging with the hook, as shown inFig. 3B , and once the roof window is subsequently closed, thesledge 30 will slide back in a direction away from thespring assembly 20 and the spring now coupled to thesledge 30 will exert a pulling force on thesledge 30 and provide a resistance against the closing of the roof window. The pulling force of the spring and the weight of the roof window are preferably balanced such that the roof window can be positioned in an open position without closing due to its own weight or opening further due to the pull from the spring in the spring assembly. This balance is also influenced by the inclination of the roof that the roof window is installed in. The spring in thespring assembly 30 may be adjusted to balance the roof window in a specific roof inclination. If the roof window is installed in a roof with a roof inclination different than the intended inclination, the spring force acting on the sledge will not be balanced to the weight of the window. In one example, the spring may exert too much force on the window thereby forcing the window to open further. In another example, the spring may be too weak, and the window will close due to its own weight. In both cases, the window is difficult for the user to operate and potentially hazardous. To easily adjust the roof window according to roof inclination, an adjustment system as shown inFigs. 2 - 3 and6 - 11 may be used. In these embodiments, the adjustment system is installed to adjust the position of the second end of theadjustment arm 52 in thesledge guide 16. Alternatively, it may be envisioned that theadjustment system 50 is instead installed in the liftingarm 14 such that the first end of the adjustment arm is attached to the liftingarm 14 through an adjustment system and the second end of the adjustment arm is attached to the sledge guide. - In
Figs. 3A and 3B a slidingdisc 43 on the liftingarm 14 is present. A further sliding disc may be arranged on the other side of the liftingarm 14 as well. The sliding disc reduces the distance to thesledge guide 16 and adds stability to the lifting arm as it travels from an open to a closed position or vice versa. - An adjustment arm rivet 57 - better shown in
Fig. 3B - connects the liftingarm 14 to theadjustment arm 52 firmly, while enabling their rotational movement with respect to each other. -
Fig. 4 shows asash wheel 40 in awheel guide 41 where thewheel guide 41 is provided with longitudinal flanges projecting from both longitudinal edges of the wheel guide thereby forming a channel which thesash wheel 40 can move in.Fig. 5 shows an alternative embodiment of thelifting device 10 where thewheel guide 41 is configured as a plate. Generally, the second end of the lifting arm may also comprise flanges that surround the sash wheel or part of the sash wheel, as shown inFig. 5 . -
Figs. 6 and 7 each shows a part of the lifting device with the liftingarm 14 extending upwards and away from thesledge 30. In these embodiments the liftingarm 14 comprises afirst lifting arm 141 and asecond lifting arm 142 with the two liftingarms adjustment arm 52. The two liftingarms arms wheel rivet 42 displayed inFigs. 4 and 5 may be used as means to keep the two liftingarms arms arms adjustment arm 52 and through the attachment to thesledge 30. Each of these means of fixing the two lifting arms to each other may be used in combination or individually. As also depicted inFigs. 6 and 7 , theadjustment arm 52 comprises afirst adjustment arm 521 and asecond adjustment arm 522. The two liftingarms Fig. 9 . Similarly, the twoadjustment arms -
Figs. 6 and 7 additionally show theadjustment system 50.Fig. 6 particularly shows anadjustment slot 55 with anadjustment bushing 54 engaged with theadjustment slot 55. In this embodiment theadjustment slot 55 is a linear slit -in the form of a track- on an outer part of thesledge guide 16 limiting theadjustment bushing 54 and thereby theadjustment arm 52 to travel in a linear direction in theadjustment slot 55. Theadjustment slot 55 may alternatively be slightly curved such that theadjustment arm 52 travels in a semi-circle. The longitudinal direction of theadjustment slot 55 may additionally or alternatively be arranged in a direction substantially in parallel with the sliding direction of the sledge. The longitudinal direction of theadjustment slot 55 may in other embodiments travel in a direction that is perpendicular to the sliding direction of thesledge 30 in thesledge guide 16. -
Fig. 7 shows asledge guide rivet 58 for added stability of thelifting device 10. Thesledge guide rivet 58 locks the two sides of the sledge guide to each other and simultaneously ensure that the adjustment system also shown inFig. 7 is kept in place. -
Fig. 8 shows alifting device 10 for a roof window from a top perspective view. It is clearly shown that in this embodiment the first and thesecond adjustment arms adjustment system 50, but are attached to each to other at a point located close to their attachment to theadjustment system 50 and up until their attachment to the liftingarms adjustment arms -
Fig. 9 shows a perspective view of the lifting device in an open position, where a central plane P is illustrated. The imaginary central plane P extends in a longitudinal or length direction L and height direction H and is defined as the plane where the respective forces exerted by the lifting arm and the adjustment arm are balanced. The central plane P intersects thesledge guide 16 in the middle of the width of thesledge guide 16. The width is defined as extending in the width direction, the width direction being perpendicular to the length direction. The two liftingarms Fig. 9 the sledge guide is shown as extending along the length direction that defines the central plane P. The lifting device is shown in an open position and the lifting arm extends substantially in the height direction in this open position. When thelifting device 10 is in the closed position, such as shown inFig. 3A , the lifting arm extends substantially along the length direction together with the sledge guide. Similarly, the twoadjustment arms arms arm 14 onto the central plane P are balanced. Furthermore, thesledge guide 16 is symmetrical with respect to the central plane P. The liftingarm 14 comprises afirst lifting arm 141 and asecond lifting arm 142 arranged symmetrically with respect to the central plane P. -
Figs. 10 and 11 show a lifting device from a side view. InFig. 10 , theadjustment arm 52 is adjusted such that its second end is in a position creating an angle α1 between the liftingarm 14 and the adjustment arm when the window is in an open position. - In
Fig. 11 , the roof window is in the same open position as inFig. 10 and the second end of theadjustment arm 52 is adjusted such that the angle between theadjustment arm 52 and the liftingarm 14 is an angle α2. InFig. 11 it is also visualized how theadjustment arm 52 can be adjusted by means of amechanical tool 60 such as a drill bit fitted and rotated into anopening 161 in thesledge guide 16 of thelifting device 10, also shown inFigs 2 ,3 . Theadjustment arm 52 shown inFig. 10 is arranged for a roof window installed in a roof with an inclination of approximately 65°, whereas the roof window shown inFig. 11 is arranged for a roof window installed in a roof with an inclination of approximately 15°. By adjusting theadjustment arm 52 to a position in between these two extremes the forces can be balanced for roof inclinations varying in the range of 15° to 65°. The adjustment system may also adjust the lifting device to operate smoothly in roof windows installed in lower or higher roof inclinations, such as 10° or 70°. -
Figs. 12A - 12B show an example of how a mechanical tool and an adjustment system may interact. InFig. 12A amechanical tool 60 is shown to fit into theopening 161 in thesledge guide 16. Themechanical tool 60 has a drill bit fitted to theadjustment screw 53.Fig. 12A shows how anadjustment bushing 52 may be fitted onto theadjustment screw 52.Fig. 12A also shows how theadjustment bushing 52 is fitted to anadjustment slot 55. By turning themechanical tool 60 in this embodiment shown as a drill bit, theadjustment screw 53 is turned. This results in theadjustment bushing 52 being moved along the length direction of theadjustment screw 53 and as well to move along in the adjustment slot. As can be seen fromFig. 12A , theadjustment slot 55 has indications showing what roof inclination theadjustment system 50 is adjusted for. InFig. 12A theadjustment system 50 is adjusted to a roof inclination of approximately 15°. InFig. 12B theadjustment system 50 is adjusted to a roof inclination of approximately 65°. InFig. 12B it is shown how theadjustment arm 52 may be connected to theadjustment bushing 52. - The invention is not limited to the embodiments shown and described in the above, but various modifications and combinations may be carried out.
-
- 1
- Primary frame
- 2
- Secondary frame
- 4
- Pane
- 4i
- Interior pane surface
- 4e
- Exterior pane surface
- 10
- Lifting device
- 12
- First end of lifting arm
- 13
- Second end of lifting arm
- 14
- Lifting arm
141 First lifting arm
142 Second lifting arm - 16
- Sledge guide
161 opening - 20
- Spring assembly
- 30
- Sledge
- 31
- Sledge wheel
- 40
- Sash wheel
- 41
- Wheel guide
- 42
- Wheel rivet
- 43
- Sliding disc
- 50
- Adjustment system
- 52
- Adjustment arm
521 First adjustment arm
522 Second adjustment arm - 53
- Adjustment screw
- 54
- Adjustment bushing
- 55
- Adjustment slot
- 56
- Adjustment base
- 57
- Adjustment arm rivet
- 58
- Sledge guide rivet
- 60
- Mechanical tool
- 100
- Roof window
- P
- Central plane
- H
- Height direction
- L
- Length direction
- α1
- Angle
- α2
- Angle
Claims (19)
- A roof window (100), comprisinga stationary primary frame (1),at least one secondary frame (2), such as a sash and/or an intermediate frame, anda lifting device (10) comprising a lifting arm (14) inserted between the primary frame (1) and the at least one secondary frame (2), the lifting arm (14) having a first end (12) rotatably connected with a sledge (30) slidably connected with the primary frame (1) in a sledge guide (16) and a second end (13) connected with the at least one secondary frame (2), the lifting device (10) furthermore comprising a spring assembly (20) configured to be coupled to the sledge (30),the lifting device (10) further comprising an adjustment arm (52) having a first end rotatably connected to the lifting arm (14) and a second end rotatably connected to the sledge guide (16),wherein the second end (13) of the lifting arm (14) is arranged to move translationally along the secondary frame (2).
- A roof window (100) according to claim 1, wherein the second end (13) of the lifting arm (14) and the secondary frame (2) have a roller connection via a sash wheel (40).
- A roof window (100) according to claim 2, wherein the sash wheel (40) is configured to roll on a wheel guide (41) during an opening and or closing movement of the roof window, the wheel guide (41) being connected to the secondary frame (2).
- A roof window (100) according to any one of claims 2 and 3, wherein the lifting arm (14) is connected to the sash wheel (40) via a sash wheel rivet (42).
- A roof window (100) according to any one of claims 2 to 4, wherein the sash wheel (40) comprises 25 - 45 %vol glass fibre.
- A roof window (100) according to any one of claims 3 to 5, wherein the sash wheel (40) and/or wheel guide (41) have fitting serrations.
- A roof window (100) according to any of the preceding claims, wherein the adjustment arm (52) is rotatably connected to the sledge guide (16) through an adjustment system (50).
- A roof window (100) according to claim 7, wherein the adjustment arm (52) and the lifting arm (14) are connected at an angle (α1),
wherein the angle (α1) is configured to assume a second angle (α2) by adjusting the position of the second end of the adjustment arm (52) by means of the adjustment system (50). - A roof window (100) according to any of claims 7-8, wherein the adjustment system (50) comprises an adjustment screw (53).
- A roof window (100) according to claim 9, wherein the adjustment system (50) further comprises an adjustment bushing (54), wherein the second end of the adjustment arm (52) is connected to the adjustment screw (53) through the adjustment bushing (54).
- A roof window (100) according to any of claims 7 - 10, the sledge guide (16) further comprising an adjustment slot (55), wherein the adjustment system (50) is configured to be accommodated in the adjustment slot (55).
- A roof window (100) according to claims 10 and 11, wherein the adjustment bushing (54) is configured to be engaged with the adjustment slot (55).
- A roof window (100) according to any of claims 7 - 12, wherein the sledge guide (16) comprises an opening (161) adapted to receive a mechanical tool such as a tip end of a drill bit fitted to the adjustment screw (53).
- A roof window (100) according to any one of the preceding claims, wherein the roof window further comprises an insulating glazing unit.
- A roof window (100) according to any one of the preceding claims, wherein the sledge (30) comprises a sledge wheel (31) configured to roll on the sledge guide (16) and/or a runner mounted on the sledge configured to cooperate and/or engage with the sledge guide (16).
- A roof window (100) according to any one of the claims 7-15, wherein the adjustment system (50) further comprises an adjustment base (56) fixed to the sledge guide (16).
- A roof window (100) according to claim 2, wherein the sash wheel (40) has a diameter of approximately 30 mm.
- A roof window (100) according to claim 2, wherein the sash wheel (40) has one or more cavities.
- A roof window (100) according to claim 2, wherein the sash wheel (40) is moulded.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA202270627A DK202270627A1 (en) | 2022-12-19 | 2022-12-19 | Roof window with a lifting device |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4390028A1 true EP4390028A1 (en) | 2024-06-26 |
Family
ID=91270509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP23218116.4A Pending EP4390028A1 (en) | 2022-12-19 | 2023-12-19 | Roof window with a lifting device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP4390028A1 (en) |
DK (1) | DK202270627A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4429494A (en) * | 1981-12-08 | 1984-02-07 | V. Kann Rasmussen Holding A/S | Window, especially for installation in an inclined roof |
WO1989010460A1 (en) | 1988-04-08 | 1989-11-02 | V. Kann Rasmussen Industri A/S | A window, especially for installation in an inclined roof |
WO1995016097A1 (en) * | 1993-12-10 | 1995-06-15 | V. Kann Rasmussen Industri A/S | A window, particularly for installation in an inclined roof surface |
EP1873323B1 (en) | 2006-06-27 | 2011-05-18 | VKR Holding A/S | A lifting device and a window comprising such a lifting device |
EP2762665A2 (en) | 2013-02-01 | 2014-08-06 | VKR Holding A/S | A pivot hinge fitting with engagement means and a roof window comprising a set of such pivot hinge fittings |
WO2019101281A1 (en) | 2017-11-24 | 2019-05-31 | Vkr Holding A/S | Roof window with a primary frame and at least one secondary frame, method for installing such a roof window and method for dismantling a secondary frame of the roof window |
-
2022
- 2022-12-19 DK DKPA202270627A patent/DK202270627A1/en unknown
-
2023
- 2023-12-19 EP EP23218116.4A patent/EP4390028A1/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4429494A (en) * | 1981-12-08 | 1984-02-07 | V. Kann Rasmussen Holding A/S | Window, especially for installation in an inclined roof |
WO1989010460A1 (en) | 1988-04-08 | 1989-11-02 | V. Kann Rasmussen Industri A/S | A window, especially for installation in an inclined roof |
WO1995016097A1 (en) * | 1993-12-10 | 1995-06-15 | V. Kann Rasmussen Industri A/S | A window, particularly for installation in an inclined roof surface |
EP0733146B1 (en) | 1993-12-10 | 1997-06-11 | V. Kann Rasmussen Industri A/S | A window, particularly for installation in an inclined roof surface |
EP1873323B1 (en) | 2006-06-27 | 2011-05-18 | VKR Holding A/S | A lifting device and a window comprising such a lifting device |
EP2762665A2 (en) | 2013-02-01 | 2014-08-06 | VKR Holding A/S | A pivot hinge fitting with engagement means and a roof window comprising a set of such pivot hinge fittings |
WO2019101281A1 (en) | 2017-11-24 | 2019-05-31 | Vkr Holding A/S | Roof window with a primary frame and at least one secondary frame, method for installing such a roof window and method for dismantling a secondary frame of the roof window |
Also Published As
Publication number | Publication date |
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DK202270627A1 (en) | 2024-07-02 |
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