WO2016071333A1

WO2016071333A1 - A screen for a window opening

Info

Publication number: WO2016071333A1
Application number: PCT/EP2015/075587
Authority: WO
Inventors: Steven Davies
Original assignee: Steven Davies
Priority date: 2014-11-03
Filing date: 2015-11-03
Publication date: 2016-05-12
Also published as: GB201419551D0; GB2531812A; GB2547599A; GB201708891D0

Abstract

The present invention relates to a screen that allows controllable ventilation through a window opening, such as a window of a vehicle, caravan or a dwelling. The screen comprises a rigid inner sheet connected to a rigid outer sheet, each sheet has at least one vent, the inner sheet and outer sheet are spaced apart by at least one projection; a middle frame is sandwiched between the inner and outer sheets, the middle frame has an upper edge adapted to be received in a channel defined by the window opening; a displaceable cover is arranged parallel to the inner sheet and outer sheets and has apertures that correspond to the vents of the inner sheet and outer sheet so when displaced the cover opens and closes the vents; a layer of mesh is arranged between the inner and outer sheets for preventing insects from passing through screen; and at least two elongate wings are moveably connected to the outer sheet and which are adapted to move outwards when a force is applied to an end of the elongate wings so as to lock the screen in a window opening.

Description

A Screen for a Window Opening

Field of the Invention

The present invention relates to a screen, more particularly the invention relates to a screen that allows controllable ventilation through a window opening, such as a window of a vehicle, caravan or a dwelling.

Background

Screens and covers that may be fitted into a window opening of a vehicle to exclude insects are known. It is often important to prevent access of insects into a vehicle so as to reduce the risk of a driver being bitten and so help to prevent spread of diseases carried by such insects.

Such screens typically have a net and a means of fixing the screen in the window opening. The screen may also have closure means to cover the net to control the degree of ventilation. Some of these devices are of fixed size and can only be fitted to a specific size opening.

However, to accommodate the wide range of window sizes in vehicles, and to provide an easily deployable screen and a simple and reliable means for fixing the screen in place, it is preferable that a frame that defines the screen is adjustable to vary its size and has a simple fixing means.

Existing screens do not provide a ready means to vary the frame size to a range of window sizes and often have complicated locking means that add bulk and weight and increase costs.

Furthermore in some existing devices the net that prevents insects from entering can be moveable and therefore can in some orientations allow insects to pass through the screen. Also in some cases, because of its flimsy nature, the net may reduce security of the vehicle as it can be easily removed or broken to gain access. Prior Art

There are various forms of nets available that can be fitted to a vehicle to prevent insect passing therethrough. Some of these are described in the following:

Chinese Utility Model CN-A-202656833U (Liu) discloses a novel ventilation window having a function of dispelling odours from a new car. The ventilation window represents a piece of car ventilation equipment which is fixed by a car sash and glass and may be used in a snowy and rainy weather. The ventilation window comprises a panel, a blind window, a fixed plate, an L-shaped part and a screen window capable of preventing mosquitos.

International Patent Application WO-A-2012160580 (Diana et al) discloses a device for closing window apertures in road and rail vehicles comprises a net of the mosquito net type stretched over a rigid frame connected to a mechanism for raising and lowering the net to cover a window aperture.

International Patent Application WO-A-2008143457 (Lee) discloses a shielding assembly for car windows, which in use is mounted to a car window to block the sun or protect against flies, mosquitoes, and other harmful insects. The shielding assembly includes a main support frame, a shielding unit, and a holding means.

Japanese Patent Application JP-A-2007283996 (Shimizu) discloses a net device for a window that can be easily attached and detached and installed without leaving a gap.

Japanese Patent Application JP-H-09240272 (Gen) discloses a net unit for windows of motor vehicles the unit has a connection frame at a lower part of a main frame that is connected to the upper edge of window glass.

An object of the present invention is to provide a screen that prevents insects passing.

Another object of the present invention is to provide a screen which controls ventilation. A further object of the present invention is to provide a screen which controls the passage of light through the screen whilst ensuring the screen is securely fixed in a window opening so as to prevent access. Summary of the Invention

According to a first aspect of the present invention there is provided a screen that permits ventilation and enables variation of an amount of light passing therethrough the screen comprising: a rigid inner sheet connected to a rigid outer sheet, each sheet has at least one vent, the inner sheet and outer sheet are spaced apart by at least one projection; a middle frame is sandwiched between the inner and outer sheets, the middle frame has an upper edge adapted to be received in a channel defined by the window opening; a displaceable cover is arranged parallel to the inner sheet and outer sheet and has apertures that correspond to the vents of the inner sheet and outer sheet so when displaced the cover opens and closes the vents; a layer of mesh is arranged between the inner and outer sheets for preventing insects from passing through screen; and at least two elongate wings are moveably connected to the outer sheet and which are adapted to move outwards when a force is applied to an end of the elongate wings so as to lock the screen in a window opening.

Ideally the at least two elongate wings are moveable by the window glass or a similar moveable member in order to engage each elongate wing with the channel provided in the window opening so that the screen is fixed into the window opening as the force is applied by the moveable member.

The screen thus permits controlled ventilation into a vehicle or habitation and enables light passing through the screen to be controlled whilst preventing unauthorised access into the vehicle or habitation.

The vehicle may include but is not limited to land based vehicles such as cars, caravans, cranes, motor homes, tractors, trains, trams, trucks or lorries, water based vehicles such as boats, air based vehicles such as gliders or helicopters. The opening and closing of the vents by means of the displaceable cover enables the screen to weatherproof and light proof the vehicle or habitation whilst also ensuring the vehicle or habitation is secure by preventing unauthorised access. The screen is preferably securely locked in place during use so as not to reduce security of the vehicle or habitation.

Furthermore the screen can reduce the requirement for use of air conditioning as it enables an internal space to be ventilated whilst preventing access by insects. In this way a user may install a screen that can be used as an alternative to air conditioning.

Typically the screen is designed for fitting into a substantially square opening wherein the screen engages with the window opening on four sides. For example the screen is fitted into a window frame or space defined by a window seal.

The screen may be adapted to fit other shapes of window opening, such as triangular windows. Preferably the screen is adapted to be fitted in the window opening of a vehicle when the window glass is wound down. In this way a screen is provided to fill the window opening so as to prevent insects passing through whilst still permitting ventilation via the vents and provides security to the vehicle by preventing access through the window opening by means of the screen.

It is appreciated that a habitation may also have a suitable window opening for receiving a screen, having a sliding glass pane or other similar moveable member that can be used to aid with locking the screen in place. For example the screen may be used in a window opening in a; house, caravan or temporary structure.

The moveable member such as a sliding window glass serves to lock the screen in position by being moved so as to engage with the moveable wings thereby forcing them outwards and into a channel defined by the window opening or the window opening or frame. Typically the screen is dimensioned to fit within the window opening of the vehicle or habitation when the window is opened, and is retained within the window opening by locating an upper edge of the middle frame into a channel in the window opening and by urging the wings outwards so that they engage with the channel defined in the window opening or frame.

The wings are arranged such that they can be located in a first inwards position, wherein the wings are not engaged with the window opening; and in a second outwards position, wherein the wings are engaged with the window opening. In this way the screen can be located within the perimeter of the window opening prior to the wings being extended.

The outer sheet is preferably a rigid planar sheet arranged on the outer face of the vehicle or habitation. In some embodiments the outer sheet is dimensioned to match the size of the window opening.

In some embodiments the outer sheet is adapted to overlap at least part of the window opening and in this embodiment the outer sheet is slightly larger than the window opening. In this way the outer sheet cannot pass through the window opening when arranged adjacent and parallel to the window opening.

The outer sheet may comprise a window blank portion extending downwards from the outside lower edge and adapted to fit downwards of the edge of the window opening.

The window blank may be dimensioned and shaped to cover a portion of the vehicle or habitation window glass that is not retracted when opened. In this way the window blank acts in use to cover a portion of the vehicle window to allow the screen to shut out light passing through that portion of the window.

The window blank may have an edge that is bevelled or angled with respect to the window opening. In this way the screen can fit with vehicle window openings that are irregular. It is appreciated that the screen may be adapted to exactly fit the window opening of a chosen vehicle or habitation and may be specific to a particular vehicle type or habitation, in order to provide an easy and complete fit to cover the opening. The outer sheet is connected to the inner sheet in such as way that the inner sheet and outer sheet are substantially parallel and evenly spaced apart from one another providing a space in between the sheets for the middle sheet to be arranged and sandwiched therebetween. The inner and outer sheets are spaced apart by means of one or more projection. The projection may be integrated with one or both of the sheets or may be a displaceable part such as a bolt or screw arrangement that is fitted through corresponding holes on each sheet. Advantageously by using displaceable parts the screen can be readily assembled and dissembled enabling for easy storage, transportation and replacement of parts.

For example the outer sheet could be replaced to match the vehicle or habitation to which it is fitted.

In some embodiments each vent may have rain bar arranged above each vent and projecting from the outside face of the outer sheet so as to deflect rainwater away from the vents so as to prevent ingress of water. The rain bars may be moulded as part of the outer sheet. The rain bar(s) may be displaceable, for example having a recess on the outer sheet for receiving the rain bar.

The inner sheet is also preferably in the form of a rigid planar sheet. The inner sheet may be dimensioned to substantially match the window opening so as to enable the screen to be arranged within the opening.

The projections joining the outer and inner sheets provide a space between the sheets for housing the middle sheet.

The inner sheet and outer sheet each have an inside surface, facing inwards, adjacent to the window opening in use and an outside surface that faces outwards, either to the outside of the vehicle or habitation, in the case of the outer sheet, and inside the vehicle or habitation with regards to the inner sheet.

The inside surface may be shaped to correspond to the shape of the window opening; for example to correspond to any recesses or undulations, or so as to permit access to any buttons, handles or controls associated with the window opening.

The outside surface may be shaped so as to provide a uniform finish, for example corresponding to the vehicle or habitation.

The outer surface of the outer layer may include text or images for advertising purposes, for example to include a logo. The middle frame is sandwiched between the outer sheet and inner sheet in use. The middle frame is typically shaped to match the window opening having an upper edge that is adapted to fit into a channel of the window opening so as to locate the middle frame within the window opening. The upper edge of the middle frame is typically arrange to stand proud of the outer sheet so that the upper edge can be presented to the channel in the window open in order for the upper edge to be located in position.

The middle frame is preferably attached to the outer sheet. The middle frame may be attached the outer sheet by attachment means such as screw or bolts or may be adhered or bonded to the outer sheet.

In some embodiments the middle frame and outer sheet may be formed as one part. In an alternative embodiment the middle frame may be attached to the inner sheet.

In some embodiments the upper edge of the middle frame may be shaped so as to enable the wings to abut the upper edge of the middle frame providing a secure fitting that is not able to move when the parts are in contact. Advantageously this ensures a good fit and aids with stabilising the wings in place. The middle frame is typically a similar or identical thickness to the channel in the window opening so as to fit snuggling and to reduce rattling in use. Therefore the middle frame may for example be the same thickness of the window glass so as to fit within the window seal of a vehicle, typically 3mm to 4mm thick. In some embodiments only the upper edge of the middle frame may be this thickness and the rest of the middle frame may be of a different thickness, for example being thinner so as to reduce weight of the screen.

The screen comprises at least one elongate wing provided at or close to an edge of the screen so as to be moveable between a location wherein the wings can sit within the footprint of the inner and outer sheets whilst not engaged with the window opening (a retracted position) and wherein the wings can be extended outwards so as to extend beyond the footprint of the inner and outer sheets (an extended position).

The wings and middle frame may be of the same thickness arranged so as to form a single layer between the inner and outer sheets wherein an edge of the wings that abuts the middle frame correspond to the shape of the edge of the middle frame. In some embodiments the footprint of the wings and middle frame combined may have substantially the same outline as the window opening.

Preferably the elongate wings are attached to the outer sheet by one or more pin that passes through an elongate aperture arranged on the wing. In this way the, or each, wing is able to move as the pin passes along the elongate aperture so as to move position of the wing relative to the outer sheet.

The elongate aperture is arranged to permit inwards and outwards movement of the wings relative to the outer sheet. Therefore the elongate aperture is substantially in a horizontal plane relative to the direction of desired movement, although the elongate aperture may be at an angle, preferably at 45 degrees so as to permit the wings to move outward and upwards as they engage with the window opening.

Therefore wings have a range of movements between an inwards (retracted) arrangement and an outwards (extended) arrangement. This permits one screen to be suitable for use in window openings of different sizes wherein the wings are displaced so as to engage appropriately with the window opening, displacing further for a wider opening.

Preferably the screen has a pair of parallel, opposed elongate wings arranged substantially perpendicular to the upper edge of the middle frame so as to slot into a channel on each side of the window opening.

Ideally the upper ends of the wings may have an arcuate finish so as to corresponding to the curvature of an opening and so as to have no sharp edges.

The upper ends of the wings may also include a shaped section that corresponds to the shape of the upper edge of the middle frame so that the parts are in contact with one another forming a stable, strong connection. In some embodiments the end of the wings that engages with the window glass may be sloped or be shaped relative to the window glass so as to ensure the screen is easily mounted into and removed from the window opening from inside the vehicle and so that the wings are encouraged to move outwards when force is applied by the window glass.

The screen optionally comprises a control mechanism operable to extend and or retract a wing. The control mechanism may comprise a tab in contact with a wing and projecting from the screen through a slot on the inside surface of the inner sheet. In this way a user can operate the mechanism by moving the tab, for example by sliding the tab so that it engages or disengages a wing with the window opening. In this way the wings may be retracted manually to allow the screen to be inserted into or removed from the window opening.

Typically the control mechanism is provided on the inside of the screen so that the mechanism can only be controlled from inside the vehicle or dwelling. In some embodiments a mechanism for controlling the wings may be provided separately for each wing. In another embodiment the control mechanism for each wing may be linked so as to move wings in unison when the control mechanism is activated.

In some embodiments one or more wings are spring loaded to remain in an extended position until retracted by the user either manually or by means of a control mechanism. In this way the wings are biased to be engaged with the window opening and force must be applied to retract the wings from the channel in the window opening. Advantageously this ensures the screen remains securely fitted during use and can make fitting easier as there is no requirement for a user to physically urge the wings into the channel of the window opening.

In some embodiments each wing may be shaped and dimensioned to receive the upper edge of the vehicle window glass or a similar moveable member. The displaceable cover enables opening and closing of the vents on the outer and inner sheets so as to control airflow and passage of light. The displaceable cover is operable so as to move between a closed configuration, in which the vents are covered, and an open position in which at least a part of the vents are uncovered. Preferably the displaceable cover is arranged such that it can create a closed seal against the outer sheet or inner sheet (depending upon which side of the middle frame it is mounted) so as to render the screen weatherproof and light proof.

In some embodiments the displaceable cover may be shaped or moulded, or include resiliency deformable sections to ensure a seal is formed with the outer sheet or inner sheet.

The displaceable cover may be arranged in a track provided on the middle frame so as to hold the displaceable cover in position and to permit linear movement.

Typically the vents and apertures are horizontal slots and movement up and down of the displaceable cover serves to open and close the vents.

In some embodiments the vents may be shaped and/or arranged to form a pattern, image or design, for example so that the vents define a pattern or logo. The displaceable cover is adapted so as to be able to cover the vents in one or more orientation.

In some embodiments the apertures and vents may be in a vertical alignment wherein the displaceable cover slides left or right as opposed to up and down in order to open and close the vents. In yet further embodiments the vents may be opened and closed by rotating a displaceable cover so as to cover and uncover the vents. Ideally the vents and apertures correspond to one another so that when the apertures are aligned with the vents are open and when the displaceable cover is moved out of alignment can be arranged to fully or partially covers the vents.

In some embodiments the displaceable cover may comprise a plurality of slats moveable to open or close the vents. Typically the slats may be arranged on the inner and/or outer sheets.

The slats may move vertically or laterally, and may rotate about an axis to adopt a variable angle relative to the vents as known in the operation of a Venetian blind.

The slats may be provided in a vertical or in a horizontal orientation. The slats may comprise a seal material, which is resiliency deformable, provided on an edge of the slat to contact an adjacent slat when in the closed position or to contact the inner or outer sheet depending upon location of the displaceable cover. The seal material may be an elastomer or synthetic rubber to conform to edges of the window frame.

In a displaceable cover where the slats are adapted to rotate as in a Venetian blind, the seal material may be provided on the inside of the external edge of the slat, the external edge being that which rotates to face away from the screen when opened.

The screen may comprise a displaceable cover control means provided on the inside of the screen and which is adapted to control the position of the cover. The cover control may be operable to move the displaceable cover, for example moving the displaceable cover up and down, to the left and right or by rotating the slats.

The displaceable cover control means may comprise a dial or lever that is moved to mechanically displace the displaceable cover. In some embodiments a motorised or electronic means of actuating the displaceable cover may be provided. This permits the displaceable cover to provide a means to control the proportion of the vents that are open to allow flow of air, so as to control the degree of ventilation provided by the screen and so as to control light that can pass through the screen. Typically the displaceable cover is made from a strong, durable lightweight material.

It is envisaged that the screen, apart from the mesh, may be made from a synthetic plastics material or a metallic material such as steel or aluminium. Preferably the displaceable cover is formed from an opaque material, so acting to control the amount of light passing through the screen. In this way the cover provides a means to control both the ventilation and illumination passing through the screen. In some embodiments the displaceable cover may be made from a light reactive material so as to vary the opacity depending on light levels. For example opacity could be reduced in bright sunlight and enhanced in darkness.

In yet further embodiments the displaceable screen may be formed with a privacy film or smoked or tinted material so as to prevent a person being able to view into the vehicle or habitation whilst still permitting a user to view out of the window.

The mesh layer prevents insects passing through the screen. Typically the mesh is made from a flexible, lightweight, strong, durable material. For example the mesh may be formed from a synthetic plastics material. In other embodiments a metal mesh may be used. The mesh is typically attached to the inner or outer sheet so as to fully cover all vents. The mesh may be attached by fixings and/or an adhesive so as to provide no gaps through which an insect may pass. The size and shape of the mesh opening may be variable, typically being sized to as to prevent any insect passing through whilst still permitting flow of air.

Preferably the outer sheet, inner sheet, middle frame, displaceable cover may be formed from a synthetic plastic such as a moulded polymer, for example Perspex (RTM) or a polycarbonate. The screen when fitted to the window opening typically provides greater strength than the existing window glass that would normally fill the window opening.

In some other embodiment the outer sheet, inner sheet, middle frame, displaceable cover may be formed from a metal or metal alloy. Typically if formed from metal or metal alloy the parts may be coated, such as powder coated.

The upper edge of the middle frame may have a resiliently deformable edge so as not to damage the window opening during engagement. The wing edges that engage with the window opening may also have a resiliently deformable edge or a coating so as to prevent damage.

Advantageously the resiliently deformable edges may help provide a secure fit and reduce vibration and any rattling of the screen.

The lower end of the wings may include or comprise a resiliently deformable material to form a flexible surface that engaged with the window pane.

The screen is ideally fitted by using the following steps.

Firstly the screen is arranged in the window opening from inside the vehicle or habitation. The screen is held vertically and tipped slightly towards the user so that the upper edge of the middle frame can be slotted into the channel of the window opening. In the case of a vehicle this would be between the window seals.

Secondly the screen is pulled back against the window, in the case of a vehicle against the window seals, and the pair of elongate wings are moved outwards and upwards so that they engage with the channel of the window opening. The screen is now engaged on three of the four sides.

Thirdly the window glass (or other moveable member) is raised so that it passes between the inner and outer sheets and engages with the lower ends of the elongate wings, thereby fixing them in position and locking the fourth side of the screen in the window opening by virtue of the window glass being sandwiched between the inner and outer sheets and in contact with the ends of the elongate wings. Therefore once fitted the screen can only be removed from inside the vehicle by lowering the window glass and/or a moveable member in order to disengage the wings from the window opening.

Typically a motorised winding window has a limit switch that prevents winding up of the window glass when a force of a pre-set intensity is encountered. In this way the automatic window winder will stop once the wings are engaged with the window glass and the wings are also engaged with the window opening wherein no further upwards or outer movement can be achieved. The displaceable cover can be adjusted, by moving it up or down in order to control opening of the vents and thereby control amount of light, if any that passes through the screen.

In some embodiments the screen may include a handle located on the outside surface on the inner sheet so as to aid with holding the screen whilst it is located in the window opening. For example the handle may comprise a bar arranged across the outer surface around which a user can grasp their hands.

In some other embodiments each wing may include a handle so as to aid with positioning the wings so as to fix the screen in the window opening.

In some embodiments the screen may be provided in a two part configuration so that the screen can be more easily transported and so that each lighter weight part can be more easily moved separately. Typically the screen is split so as to have a lower portion and an upper portion that have a means of attachment to allow the two parts to be joined together in use. The means of attachment may include but is not limited to mating parts such as T-section or track, hole and pin, snap fittings or the parts may connect via magnets. Ideally the two part configuration comprises the same layers as describe above. Typically the first and second parts are assembled prior to fitting in the window.

In an alternative embodiment the screen may have a sheet of transparent material instead of a mesh, wherein the displaceable cover serves to control the amount of light that can pass through the screen. Insects are prevented from passing through by the transparent layer. In yet further embodiments the displaceable cover may include sections of mesh and solid sections so that the displaceable covered can be positioned so as to allow ventilation by aligning the mesh sections with one or more vent, or to prevent ventilation by arranging a solid section with the vent(s). Furthermore the solid section may include transparent, translucent and/or opaque sections so as to vary the amount of light and visibility permitted through the screen depending upon the arrangement of the displaceable cover. In this way there may be no requirement for a separate mesh layer.

In some embodiments the screen further comprises in use a fan, configured for ventilation purposes, so as to blow or direct air into the vehicle/habitation and/or configurable for insect dispersal and/or vehicle/habitation aeration purposes to blow or direct air out of the vehicle/habitation. In this way in some embodiments the fan may be fixed in position, whereas in others the fan may be adjustable in position and/or orientation so as to provide a plurality of customisable uses.

In some embodiments a powered screen may provide lighting and/or insect killing electrical fields or elements in addition or as an alternative.

In yet further embodiments the screen may include a camera so as to record and display images external to the vehicle or habitation. For example a screen for use in a truck may have a rear facing infra-red camera fitted on an eternal face of the screen with a viewing screen located within the truck so that a user is able to monitor activities whilst in the truck for example to keep watch for fuel, cargo theft or access by unauthorised persons.

Such fan, infra-red and/or light source and/or camera may be provided with an integral power source such as displaceable or rechargeable batteries, or may be provided with a wired power source, for example cabling and an adaptor for the vehicle 12V DC power outlet or cigarette lighter.

In some embodiments a 24 volt power supply may be used. In yet further embodiments the fan may be powered by one or more photovoltaic cell arranged on an outer surface of the outer sheet or alternatively elsewhere on the vehicle or habitation. It is appreciated that any electrical features of the screen or associated with the screen may be adapted for remote control, for example so that the element, light, camera or fan can be remotely activated or deactivated. For example by means of a steering wheel with integrated controls or wherein the electrical features can be controlled by use of the vehicle maintenance system.

In some embodiments the screen may include one or more sensor to detect environmental factors such as temperature, light levels and humidity wherein certain levels may activate features of the screen, such as opening and closing of the vents, activating a light or fan and/or generating an alert to prompt a user to adjust the features of the screen. For example the screen may include an audible or visual alert to advise a user of a change in environmental factors. Advantageously the present invention can be provided in various sizes and shapes so as to suit different window openings.

Preferred embodiments of the invention will now be described with reference to the Figures in which:

Brief Description of Figures Figure 1 shows an example of an outer sheet; Figure 2 shows an example of an inner sheet; Figure 3 shows an example of a middle frame; Figure 4 shows an example of a pair of elongate wings;

Figure 5 shows an example of a displaceable cover; Figure 6 shows an example of a screen fitted to a truck; Figure 7 shows a second embodiment of the screen; Figure 8 shows an exterior view of a third embodiment of the invention;

Figure 9 shows a bottom view of the embodiment as shown in Figure 7, showing the recess into which the window pane is received;

Figure 10 shows a top view of the embodiment as shown in Figure 7; Figure 1 1 shows an interior view of the embodiment as shown in Figure 7; Figure 12 shows a left side view of the embodiment as shown in Figure 7; Figure 13 shows a right side view of the embodiment as shown in Figure 7; Figure 14 shows an interior isometric view of the embodiment as shown in Figure 7;

Figure 15 shows an exterior isometric view of the embodiment as shown in Figure 7;

Figure 16 shows an interior isometric view of the embodiment as shown in Figure 7 with the slats closed; and

Figure 17 shows an exterior isometric view of the embodiment as shown in Figure 7, with the slats closed.

Detailed Description of Figures

Figures 1 to 5 show parts of the preferred embodiment of the screen. Figure 1 shows an outer sheet 1 having a substantially trapezoid shape, with an upper edge 1 A two parallel opposed side edges 1 B, 1 C and a lower edge 1 D. The outer sheet 1 is dimensioned to fit the window opening of a truck (see Figure 6).

The upper edge 1 A and the lower edge 1 D are each a different angles being dimensioned to fit a window opening that corresponds to these dimensions.

The lower edge 1 D extends downwards defining a window blank that covers the window glass in use so that the entire opening can be covered if required to ensure light doesn't pass through if the vents are closed. The outer sheet is planar and formed from a strong synthetic plastics material. The outer sheet 1 has a plurality of elongate vents 2 through which air can flow. Two columns of elongate vents 2 are provided. The outer sheet includes a plurality of holes 3 that correspond to holes of other parts of the screen to enable attachment.

Figure 2 shows an inner screen 4. The inner sheet 4 is planar and formed from a strong synthetic plastic. The inner sheet 4 has similar dimensions to the outer sheet, having an upper edge 4A; parallel side edges 4B, 4C and a lower edge 4D. However, the lower edge 4D does not extend as far downwards as that of the outer sheet 1 D. Therefore the inner sheet defines a parallelogram form.

The vents 2 on the inner sheet 4 correspond to the vents 3 of the outer sheet. The inner sheet 4 includes an elongate hole 3A through with a pin protrudes from the displaceable cover so as to permit movement of the displaceable cover up and down thereby opening and closing the vents.

Figure 3 shows the middle frame 5 that is sandwiched between the inner and outer sheets 1 , 4. The middle frame 5 is a parallelogram. The upper edge 5A is shaped so as to be received by the window seal of the truck having angled corners 5E that permit the elongate wings (not shown) to abut to the middle frame 5 to ensure a secure fit and so as to reduce movement or vibration.

Figure 4 shows a pair of elongate wings 6. Each wing 6 has a pair of elongate holes 6A that receive a pin that is mounted on the outer sheet 1 so as to permit movement of the wings 6. The elongate holes 6A are arrange at 45 degrees so that the wings 6 can only move outwards and upwards when force is applied.

Each wing 6 has a shaped upper edge comprising an angled portion 6B for abutting the angled corners 5E of the middle frame 5 and a rounded corner 6C which slots into the window seal (not shown) of the window opening.

The angled of portions 6B of the wings 6 and angled corners 5E of the middle frame 5 have the same 45 degree angle as the elongate holes 6A in the wings 6 so that consistent movement is permitted wherein the contact between the wings 6 and middle frame 5 can be maintained as the wings 6 extend providing a stronger more secure locking system.

The lower end of the wings is flat so as to be parallel to the upper edge of the window glass (not shown).

Figure 5 shows the displaceable cover 7. The displaceable cover 7 has a plurality of elongate slots 7A that correspond to the vents 2 of the inner and outer sheets. The displaceable cover 7 has a pin 7B that projects through the elongate slot 3A on the inner sheet 4. This enables the user to move the screen up and down so as to opening and close the vents 2.

The displaceable cover 7 may be held in position by a friction fitting as the cover is sandwiched between layers of the screen. In some embodiments the cover 7 may be arranged in tracks (not shown) provided on the middle frame 5 so as to provide a guide for the cover 7. For example Nylon (RTM) tracks may be provided for this purpose. In a preferred embodiment, and by way of specific example only, the outer sheet has dimensions of 809mm (1 A), 751 mm (1 B), 623mm (1 C) and 809mm (1 D). The outer sheet 1 is 4.5mm thick. The inner sheet 4 has dimensions of 809mm (4A), 600mm (4B), 593mm (4C) and 809mm (4D). The inner sheet 4 is preferably 4.5mm thick. The middle frame 5 has dimensions of 710 (5A), 596 (5B) and 600mm (5C). The middle sheet is 4.5mm thick. The wings 6 are typically 598mm long and 90mm wide at the lower end that engages with the window glass. The displaceable cover 7 is 513mm x 576mm.

Figure 6 shows an image of the screen 100 as described above fitted in a vehicle window opening. The entire window opening is covered so that none of the window glass is visible.

This mechanism of fitting the screen to a window opening provides a four point locking system wherein the screen is connected as four points; the upper edge of the middle frame, the two elongate wings slotting into a channel in the window opening and the window glass or similar moveable member engaging with the lower ends of the elongate wings. Therefore the screen is thus connected on four sides and is prevented from being displaced during use.

A layer of mesh is also provided between the inner and outer sheets. The mesh extends over all the vents to prevent insects passing through. The mesh may be fixed to the inner surface of the outer sheet or the inner sheet. For example the mesh may be adhered or bonded to one of the sheets.

It is appreciated that the screen could be provided as a kit of parts for assembly or provided assembled, or provided as one preformed as one part.

Figure 7 shows a second embodiment 200 of the screen wherein the screen is provided as two parts so that it can more easily be transported and is lighter weight when carried in parts rather than all together.

The second embodiment 200 has all the same layers as the as those described in the first embodiment and these are divided into to parts and upper part 210 and a lower part 220 as shown in Figure 7A. Figure 7B shows side views of the upper part 210 and lower part 220. The lower part includes a T-section 221 for being received by a track 21 1 on the upper part 210. This enables the upper part 210 and lower part 220 to be assembled to form one part. Figure 7C shows an example of a displaceable cover 7 that has elongate slots that correspond to the vents 2 on the inner and outer sheets 4, 1 .

Figure 7D shows the three layers that from the lower part 220 comprising a section of outer sheet 1 , a section of middle frame 5 and a section of inner sheet 4.

It is appreciated that the two part screen could be provided as a kit of parts for assembly or provided assembled, or provided as preformed parts that are connected together at fitting. Referring to Figures 8 to 17, a third embodiment 8 of the invention comprises: a frame 10 adapted to fit within the window opening of a vehicle door when the vehicle window is open. The frame 10 comprises: a left side member 12 and a right side member 14, a lower member 16 and an upper member 18. The members each have an inside face 20 to face into the vehicle in use, an outside face 24, and an outer edge. Members have a length 26 to fit within the window opening and a depth to match the window edge and an aperture 30 defined between the members. A net 32 covers the aperture, the net is adapted to prevent insects from passing through the aperture.

A movable aperture cover 34 is operable to move between a closed configuration (in which the aperture is covered as shown in Figures 16 and 17) and an open position (as shown in Figures 8 to 17) in which at least a part of the aperture is uncovered. The lower member 16 comprises a groove 36 in its edge 39 to receive the upper edge of the vehicle window 37. A side member comprises a wing or edge panel 38 mounted within a recess 40 in the edge 42 of the member and projecting from it. The edge panel is operable to retract into the recess 40 and adapted to fit within the window recess of the vehicle window opening.

In this embodiment the left frame member 12 comprises a left edge panel 38 mounted within a recess 40 on its edge 42, the right frame member 14 comprises a right edge panel 44 mounted within a recess 46 on its right edge 48, and the upper frame member 18 comprises a fixed edge panel 50 mounted on its edge 52.

The embodiment shown in Figures 8 to 17 comprises a left panel control 54 provided on the inside 22 of the left frame member 1 2, operable to retract the left edge panel 38, and a right panel control 56 provided on the inside of the right frame member 14, operable to retract the right edge panel 44. The panel control is a tab 58 projecting from the edge panel through a slot 59 on the inside surface of the frame member. In this way, by sliding the tab the left and right, side edge panels may be retracted into their recess to allow the screen to be inserted into or removed from the window opening. As the control is provided on the inside edge of the frame member locking and unlocking may only be carried out when inside the vehicle.

The aperture cover 34 comprises a plurality of slats 60 moveable to open or close the cover. The slats 60 in this embodiment are provided substantially horizontally oriented and rotate to adopt an angle relative to the frame as known in the operation of a Venetian blind. The slats comprise a seal material 62 provided on the inside of the external edge of the slat so as to contact an adjacent slat when in the closed position.

The screen comprises a sliding cover control 64 provided on the inside of the screen, operable to control the angle of the slats relative to the frame.

In this embodiment the displaceable cover is formed from an opaque material, so acting to control the amount of light passing through the screen. In this way in this embodiment the cover provides a means to control both the ventilation and illumination passing through the screen.

In the embodiment shown in Figures 8 to 17 the frame 10 comprises an window blank 70 mounted on the outside of the edge 39 of the lower frame member 16 and adapted to fit outside the window opening and outside the vehicle door when the screen is mounted in the window opening. The lower member comprises a window blank extending downwards from the outside lower edge and adapted to fit downwards of the edge of the window opening.

Window blank 70 is shaped to cover a portion of the vehicle window that is not retracted into the door when opened. The window blank has an edge 74 that is angled with respect to the left frame member 12. In this way the screen can fit with vehicle window openings that are irregular. The dimensions and angle of the window blank may be adapted to fit the window opening of a chosen vehicle and may be specific to a particular vehicle type, in order to provide an easy and complete fit to cover the opening.

In the embodiment shown in Figures 8 to 17 the frame may be formed from moulded polymer or metal extrusions. The net may comprise a moulded plastic net or a metal mesh. The edge panels and window blanks may be formed from moulded polymer or metal, and the edge panels may comprise an elastomeric edge to mount into the window recesses. The lower edge of the lower frame member may comprise an elastomeric material to form the groove 36 to receive the window pane.

The invention has been described by way of examples only and it will be appreciated that variation may be made to the above-mentioned embodiments without departing from the scope of invention as defined by the claims. For example an actuator may be provided to enable a user to open or close a vent remotely whilst driving. Such an actuator may be a motor which is ideally controlled by a remote control switch which is optionally located on a steering wheel or within easy reach of a driver. Communication between the remote control switch and the motor that opens and closes the vent may be via a wireless connection or through existing wires of a vehicle.

Optionally an over-ride device is provided which prevents inadvertent disengagement of the glass window of the vehicle from disengaging from the inner and outer sheets of the screen whilst the vehicle is in motion, so as to avoid unintended disengagement of the screen when the vehicle is moving.

Claims

1 . A screen that permits ventilation and enables variation of an amount of light passing therethrough the screen comprising: a rigid inner sheet connected to a rigid outer sheet, each sheet has at least one vent, the inner sheet and outer sheet are spaced apart by at least one projection; a middle frame is sandwiched between the inner and outer sheets, the middle frame has an upper edge adapted to be received in a channel defined by the window opening; a displaceable cover is arranged parallel to the inner sheet and outer sheets and has apertures that correspond to the vents of the inner sheet and outer sheet so when displaced the cover opens and closes the vents; a layer of mesh is arranged between the inner and outer sheets for preventing insects from passing through screen; and at least two elongate wings are moveably connected to the outer sheet and which are adapted to move outwards when a force is applied to an end of the elongate wings so as to lock the screen in a window opening.

2. A screen according to claim 1 has at least two elongate wings are moveable by the window glass in order to engage each elongate wing with the channel provided in the window opening so that the screen is fixed into the window opening as the force is applied by the moveable member.

3. A screen according to claim 1 or 2 wherein an upper end of each wing is adapted to correspond to part of the upper edge of the middle frame.

4. A screen according to any preceding claim wherein the wings each include at least one elongate hole for receiving a pin that projects from the outer sheet so as to permit movement of the wings relative to the outer sheet.

5. A screen according to any preceding claim wherein at least one of the wings is spring loaded to remain in an extended position until retracted by application of a force.

6. A screen according to any preceding claim including at least one projection to join the outer sheet and inner sheet together.

7. A screen according to any preceding claim comprising a plurality of slats moveable to open or close the vents.

8. A screen according to claim 7 wherein the slats move vertically.

9. A screen according to claim 7 wherein the slats move laterally.

10. A screen according to claim 7 wherein the slats are provided in a vertical orientation.

1 1 . A screen according to claim 10 wherein the slats are provided in a horizontal orientation.

12. A screen according to any of claims 7 to 1 1 including a cover control means provided on the inside of the screen which is operable to move the slats to control the angle of the slats relative to the frame.

13. A screen according to any preceding claim wherein the outer sheet includes a window blank.

14. A screen according to any preceding claim including an electrical power supply.

15. A screen according to any preceding claim including at least one photovoltaic cell.

16. A screen according to any preceding claim including a fan.

17. A screen according to any preceding claim including electrical element.

18. A screen according to any preceding claim including a camera.

19. A screen according to any preceding claim including at least one light.

20. A method of fitting the screen as described in claims 1 to 1 9 including the steps of: the screen is held vertically and tipped slightly towards the user so that the upper edge of the middle frame can be slotted into the channel of the window opening; the screen is pulled back against the window, and the pair of elongate wings are moved outwards and upwards so that they engage with the channel of the window opening; the moveable member is raised between the inner and outer sheets so that it engages with the lower ends of the elongate wings thereby fixing them in position and locking the fourth side of the screen in the window opening.

21 . A screen substantially as described herein with reference to the Figures.