AU2014200249A1 - Insect Screen and Trap - Google Patents

Abstract

An insect screen trap for preventing access of insects into a substantially enclosed structure having at least one entry point, the insect screen comprising a frame structure adapted to be secured relative to the entry point, such that the frame structure is substantially complementary to the entry point and defines a rear face directed towards the interior of the substantially enclosed structure and a front face which is directed towards the exterior of the substantially enclosed structure, and mesh secured to the frame structure, such that a cavity is formed between the rear face and the front face and the front face comprises at least one aperture, whereby in use, an insect landing on the front face of the insect screen is directed to the cavity via the at least one aperture and is unable to exit the cavity. 16 7oasqdtoes 18 116 30..-- Figure 1 2Aa 2B-2242j Figure 2

Description

INSECT SCREEN AND TRAP TECHNICAL FIELD [0001] The present invention relates to a screen for preventing insects from entering a building and particularly to a screen which also traps the insects. The screen can be used in association with apertures such as doors, windows and ventilation outlets, although the scope of the invention is not necessarily limited thereto. BACKGROUND ART [0002] Insects are a common and constant problem in buildings. For example, the presence of flies, particularly in food preparation areas can lead to health issues. Moths are also problematic in dwellings, as the larvae of some species eat fabric, thereby damaging clothing, drapery and carpets. [0003] Another insect whose presence in buildings causes problems is the mosquito. Mosquitoes carry disease-causing parasites and viruses from person to person, such as yellow fever, malaria, Ross River fever and Dengue fever. [0004] The most common method of restricting access of insects to buildings is to fit screens to all doors, windows, ventilation outlets and any other apertures that may exist. However, whilst screens are an effective barrier preventing entry of insects into buildings, they do not reduce the population of such pests, the insects merely hovering, waiting for an opportunity to access a building, such as when a screen door is opened. [0005] Chemical insecticides and/or repellents are often used in combination with traditional insect screens and assist in the reduction of insects within buildings however they do result in a significant reduction in insect populations. Further, whilst insecticides and repellents may be effective, they can be toxic to humans and the environment. There may also be as yet unknown long-term effects caused by their use. [0006] It would therefore be advantageous to provide an alternative to the insect screens of the prior art which not only prevent entry of insects into buildings, but also provide a chemical-free means to assist in reducing the population of insects. [0007] It will be clearly understood that, if a prior art publication is referred to herein, this reference does not constitute an admission that the publication forms part of the common general knowledge in the art in Australia or in any other country.

SUMMARY OF INVENTION [0008] The present invention is directed to an insect screen trap, which may at least partially overcome at least one of the abovementioned disadvantages or provide the consumer with a useful or commercial choice. [0009] With the foregoing in view, the present invention in one form, resides broadly in an insect screen trap for preventing access of insects into a substantially enclosed structure having at least one entry point, the insect screen comprising: a) a frame structure adapted to be secured relative to the entry point, such that the frame structure is substantially complementary to the entry point and defines a rear face directed towards the interior of the substantially enclosed structure and a front face which is directed towards the exterior of the substantially enclosed structure; and b) mesh secured to the frame structure, such that a cavity is formed between the rear face and the front face and the front face comprises at least one aperture, whereby in use, an insect landing on the front face of the insect screen is directed to the cavity via the at least one aperture and is unable to exit the cavity. [0010] Mosquitoes locate bloodhosts by scent, sight and heat. From 100 feet away (30 meters) mosquitoes can smell the scent of prey, especially the carbon dioxide (CO2) exhaled. Biting flies are even better; they can smell their prey from 300 feet (100 meters) away. Because CO2 is present in the atmosphere, mosquitoes respond to higher-than-normal concentrations, especially when the CO2 is mixed with host-odour. Mosquitos follow a scent upwind, and can physically see prey at a distance of about 30 feet (10 meters). [0011] This means that a structure containing people, will discharge a substantial amount of CO2 into the atmosphere, normally through the entry points. Mosquitos and other insects track this discharge back to the entry point. The present invention makes use of this discharge as a natural attractant for the insects and traps them once they have reached the entry point. [0012] The insect screen trap can be fitted to any substantially enclosed structure from which it is desired to exclude insects. The substantially enclosed structure can therefore be a building, such as a residential or a commercial building. The insect screen trap can be fitted to at least one entry point of the building, including doors, windows and ventilation outlets. [0013] In an alternative embodiment, the substantially enclosed structure can be a temporary dwelling, such as a portable building, demountable, caravan, campervan or tent. Insect screen traps according to the current invention can be fitted to one or more of the entry points on such structures. [0014] The use of frame members to make up the frame structure allows the frame structure to be constructed to fit an entry point of any size and/or shape. The frame structure can therefore be constructed to fit rectangular- or square-shaped entry points such as doors and windows. In an alternative embodiment, the frame structure can be constructed to fit circular- or oval-shaped entry points. In a further alternative embodiment, if necessary, the frame structure can be constructed to fit a polygon-shaped entry point, wherein the polygon is regular or irregular. [0015] Typically, the frame structure and therefore the trap will close the opening which defines the entry point, such that insects cannot access the entry point past the trap. [0016] The frame members of the insect screen trap can be made from any suitable material. The frame members can therefore be made from timber, such as is commonly used in the building industry for window and door frames. The frame members can also be made from non-timber materials such as bamboo, which can easily be split in half lengthways thereby forming frame members having a semi-circular cross section. [0017] In alternative embodiments, the frame members can be made from aluminium, which is also used in the building industry for window and door frames. [0018] A further embodiment encompasses the use of wire frame members for the insect screen trap. The wire can be any type of wire suitable for use as a frame member. The wire can therefore be single-stranded or multi-stranded and can be of any suitable gauge. [0019] The frame members of a frame structure can be made from the same material. Alternatively, the frame members of a frame structure can be made from different materials. For example a frame structure can comprise a combination of aluminium and wire frame members. Plastic frame members may also be used. [0020] The frame structure may be rigid or flexible. The mesh used may also be rigid or flexible. [0021] The frame structure provided will typically be one of two preferred types, namely an internal frame structure or an external frame structure. An internal frame structure will _r typically be formed to define the shape of the screen trap and the mesh will normally be applied around the internal frame structure. [0022] An external frame structure will typically be formed from one or more frame members with the mesh attached to the frame members. Normally, in an external frame structure each of the frame members will be a substantially U-shaped channel having a base wall or web which will typically be placed within the opening at the entry point and will abut the members defining the opening, and a pair of spaced apart upstanding sidewalls or flanges. Preferably, the mesh will be provided in unitary sheets with attachment portions located at the outer edges of the sheets. [0023] The attachment portions may be discrete or spaced apart but will preferably be continuous. The attachment portions will normally attach to the inner surface of the upstanding sidewalls of each of the frame members. As the upstanding sidewalls are spaced apart, attaching a mesh sheet to both of the upstanding sidewalls will typically space the respective mesh sheets apart. [0024] As mentioned above, the screen trap may be formed to fit entirely within the opening defined at the entry point or alternatively, the screen trap may have a mounting frame which is adapted to overlie the members defining the opening and to be attached to the periphery of the opening. [0025] The insect screen trap can be secured to the entry point by any suitable means known in the art. The insect screen trap may be secured relative to the entry point in the reverse direction as well in order to prevent insects entering the structure and to trap any insects within the structure. The insect screen trap can be secured to the entry point via the frame structure by nails, bolts, screws, rivets and other such securing means. In one embodiment, the insect screen trap is secured to the entry point via a mounting frame. [0026] Referring to the main embodiment above, the mesh can be any mesh suitable for blocking the passage of insects. The mesh can therefore be plastic, fibreglass, including PVC coated woven fibreglass, or metal, such as powder-coated aluminium or powder-coated stainless steel. Alternatively, the mesh may be a flexible material such as a fabric or similar. [0027] The insect mesh can be secured to frame structure by any suitable means known in the art. Preferably the insect mesh is reversibly secured to the frame structure for ease of cleaning and also for easy removal of insects which have collected in the cavity between the rear and front faces of the insect screen.

[0028] The insect mesh can be secured to the frame structure by hook and loop structures, including Velcro@. In another embodiment, the insect mesh can be secured to the frame structure by adhesive tape, including double-sided tape and pressure-sensitive tape. Preferably, the tape is reusable. In a further embodiment, the insect mesh is secured to the frame structure using magnetic strips. [0029] In the internal frame structure embodiment, the mesh may be formed into a pocket into which the frame structure can then be placed and the mesh may be closed about the frame structure. As the internal frame structure will typically define the shape of the trap, the mesh may not be attached directly to the frame structure, but will typically simply enclose the internal frame structure. [0030] There will typically also be an emptying point for the trap. The emptying point will typically be located in the insect mesh, normally towards a lower side or end of the trap. [0031] Another important feature of the present invention is that the face of the screen or trap, or at least a portion thereof, is typically tapered or shaped inwardly towards the aperture. Typically mosquitoes and other flying insects will "bounce" along the face of the screen or trap until they reach the aperture. By providing a tapered or shaped face, the trap of the present invention promotes movement of the insect towards the aperture. [0032] The taper or shape may be an arcuate taper or maybe a substantially rectangular or frusto-pyramidal taper. [0033] One or more apertures may be provided. According to a particularly preferred embodiment, a single elongate slot aperture is provided, running substantially transversely to the height of the trap. According to this embodiment, the forward face (namely the face of the trap which faces the direction in which the insects are likely to enter the trap, and therefore the face in which the at least one aperture is located) will typically have a number of surfaces namely, a lower surface extending from the bottom of the trap to the aperture, an upper surface extending downwardly towards the aperture, and a pair of triangular side faces which extend inwardly from either side of the trap towards the aperture. [0034] In the alternative, one or more circular apertures may be provided. [0035] Typically, the screen trap of the present invention will include at least one aperture in either the forward or rear face of the trap. Normally the forward face is oriented in the direction required, and the rear face of the trap is substantially planar and mounted to be %J flush with the periphery of the opening forming the entry point. [0036] In some embodiments however, apertures may be provided in both the forward or rear face of the trap as this may allow trapping of insects striking the trap from those outside the structure and from within the structure. [0037] In another form, the invention resides in an insect screen trap for preventing access of insects into a substantially enclosed structure having at least one entry point, the insect screen trap comprising an inwardly tapering entry adapted to be secured relative to the at least one entry point such that a cavity is formed whereby in use, an insect is directed into the cavity via the inwardly tapering entry and is unable to exit the cavity. [0038] In an alternative configuration, the frame structure is adapted to be secured relative to the entry point such that the frame structure is substantially complimentary to the entry point by adjusting the size of the frame structure to fit the entry point. In this way, a single expandable frame can be provided which will fit into a variety of differently sized entry points provided that the entry point is larger than the smallest dimension of the frame and smaller than the largest dimension of the frame. [0039] Preferably, the screen trap of this embodiment will be sold in a first, collapsed or retracted state and is expandable, typically by the installer, in order to fit the entry point. Preferably, the frame will include a number of members located relative to one another allowing at least two sides of the frame and preferably all four sides of the frame to be length adjustable. [0040] Any mechanism for the length adjustment can be provided but a telescoping mechanism is preferred. [0041] According to a particularly preferred embodiment, the frame is provided with corner structures and at least one extension arm located between the corner structures on at least two sides to allow length adjustment of at least those two sides by sliding movement of the corner structures relative to the extension arm. In a preferred embodiment, four corner structures are provided with at least one extension arm between each pair of adjacent corner structures. Preferably, a lower, extendable gutter assembly is also provided. [0042] The corner structures of the preferred embodiment will typically be provided in pairs, including two upper corner structures and two lower corner structures. The corner structures will normally be the same with the exception of the lower corner structures mounting the preferred extendable gutter assembly and also one or more cover members to allow easy removal of trapped insects. [0043] The corner structures will typically be fixed in configuration. According to a preferred embodiment, the corner structures include a pair of corner members are oriented at 900 to one another. Typically, each corner member is elongate and is preferably substantially U shaped in cross-section having a base wall and a pair of sidewalls extending substantially perpendicularly to the base wall, each side wall having a free end. [0044] The base wall will typically be substantially planar. The sidewalls will preferably be substantially planar but with one or more extensions or shaped portions provided thereon. Typically, each side wall has a free end which is angled relative to the sidewall and preferably, the free ends diverge from one another. [0045] Preferably, one or more attachment flanges is provided extending from an outer side of each side wall of each member of the corner structure. Preferably, a pair of attachment flanges is provided. Normally, the attachment flanges are spaced apart to define a receiving channel therebetween in order to receive a spline used to attach the flexible mesh of the screen trap to the corner structures. Generally, a flexible mesh layer is stretched over the upper of the two flanges on the corner members of the corner structure and is forced into the receiving channel between the preferred pair of spaced apart attachment flanges using the spline, to secure the mesh. [0046] The receiving channel normally receives the spline in an interference fit and the attachment flanges are preferably spaced apart accordingly to require some small deformation, normally compression, of the spline, as it is forced into the receiving channel. [0047] According to a preferred embodiment, at least a lower flange of the pair is provided with a rounded outer end order to allow attachment of a cover member relative thereto. Normally, a cover member is provided to cover an opening in a base wall of one or more of the corner structures in order to allow removal of trapped insects. Typically, the cover member will have a substantially planar base wall with a pair of upstanding sidewalls, each side wall having a free end, and a portion of the sidewall, preferably at or adjacent the free end, is shaped to engage the attachment flange on the corner structure. Preferably, the shaped free end will be substantially C-shaped in cross section in order to receive the rounded outer end of the attachment flange. Normally, the sidewalls of the cover member are resiliently deformable apart in order to allow the cover member to be deformed during attachment and then to grip the corner structure but allow sliding movement relative thereto guided by the shaped free end and the lower attachment flange provided on the corner structure.

0 [0048] As mentioned above, the base wall of one or more of the members of the corner structures may be provided with one or more openings therethrough with a cover member provided over the opening and which is movable relative to the corner structure in order to cover the opening or uncover the opening so that trapped insects can be removed. This allows trapped insects that fall to the bottom of the frame structure to be removed. Generally, an opening is provided in the horizontal members of the two lower corner structures. [0049] According to a preferred embodiment, a mounting flange is provided on the inside of one, and preferably both of the sidewalls of the elongate corner member of the corner structure. The purpose of the mounting flange is typically to attach or mount the extension arm relative to the members of the corner structure as well as to allow the guided movement of the extension arms relative to the members of the corner structure. Preferably, the mounting flanges extend substantially perpendicularly from the inner surface of both side walls. Typically, the mounting flanges are provided in the same plane and substantially opposite one another. Normally, each of the mounting flanges has a rounded free end. [0050] Typically, a corner connector is provided in order to connect the corner members relative to one another. Generally, the corner connector will have the same cross sectional shape as the corner members or a complimentary shape. Each corner member is preferably mitre cut at one end. This end preferably receives a portion of the corner connector or is received by a portion of the corner connector with the corner connector fastened thereto. The other end of each corner member is preferably square cut so that adjacent corner structures can abut each other to define a collapsed or retracted condition. [0051] The frame structure of the present invention also includes at least one extension arm on each side of the frame although more than one extension arm can be provided. Typically, a single elongate extension arm is provided between adjacent corner structures. Typically, four extension arms are provided. [0052] It is preferred that each of the extension arms is substantially U-shaped including a base wall and a pair of spaced apart side walls. Typically, the base wall is substantially planar and will normally in use, this sidewall will abut the base wall of the corner members. A guide structure can be provided, which for example, could include a slot, groove or channel on one of the corner members or the extension arms which receives a tongue on another of the corner members or extension arms. [0053] The sidewalls of the extension arms are typically provided with a shaped portion thereon. The shaped portion is normally substantially U-shaped. The shaped portion preferably extends substantially perpendicularly inwardly from the side walls. This will typically leave a groove or opening extending along the outside of the side walls and in use, this groove or opening will typically engage with, normally by receiving, a part of the mounting flange provided on the sidewalls of the corner members. This will typically assist with guided movement of the members relative to one another. [0054] Each of the sidewalls is typically provided with an angled free end and normally the free ends diverge from one another. [0055] Generally, one elongate extension arm is provided per side of the frame structure. The extension arm is provided normally as a central member and the corner structures are typically extendable and retractable relative to that central member. [0056] According to a particularly preferred embodiment, an extendable gutter assembly is typically provided adjacent to the lower section of the frame. The gutter is preferably also extendable. Typically, at least a portion of the gutter is mounted relative to the extension arm on the bottom side of the frame structure. Normally, this mounting is achieved through the provision of one or more fasteners. [0057] The preferred gutter is U-shaped but with divergent sidewalls angled outwardly and upwardly. This will typically give the gutter a funnel shape in cross section. Again, the gutter can be provided with divergent free ends. [0058] Typically, the shape and configuration of the gutter assembly is such that it allows nesting inside the extension arm and/or the corner members. According to the most preferred embodiment, the gutter assembly is provided as a central member attached to the extension arm with a pair of side members each attached to a respective corner structure at a lower side such that when the corners are extended, the side members move with the corner structures to extend away from the central member. Normally, the side members are attached to the corner structure at or adjacent to the corner. [0059] This configuration allows expansion and/or retraction in either or both of the two directions to fit different sized entry points. Most entry points will be substantially rectangular in shape and therefore, the frame structure of the present invention will also typically be substantially rectangular. [0060] According to a preferred embodiment, the aperture for entry into the trap may be I V defined by two spaced apart plates that are attached to one another using one or more elongate fasteners. The length of the elongate fasteners is typically less than the separation of the mesh at rest. This requires that the mesh be pinched together at the aperture by the plates according to the length of the elongate fasteners and this will provide the concave shape to the external surface of the mesh which guides the insects towards the aperture. [0061] Any of the features described herein can be combined in any combination with any one or more of the other features described herein within the scope of the invention. [0062] The reference to any prior art in this specification is not, and should not be taken as an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge. BRIEF DESCRIPTION OF DRAWINGS [0063] Preferred features, embodiments and variations of the invention may be discerned from the following Detailed Description which provides sufficient information for those skilled in the art to perform the invention. The Detailed Description is not to be regarded as limiting the scope of the preceding Summary of the Invention in any way. The Detailed Description will make reference to a number of drawings as follows: [0064] Figure 1 shows one embodiment of the insect screen traps of the current invention. [0065] Figures 2A and 2B are perspective views of embodiments of insect screen traps according to the present invention. [0066] Figure 3 is an exploded view of the embodiment of Figure 2B showing a preferred means of attaching the mesh to the frame structure. [0067] Figure 4 is a side view of a preferred means of attaching an insect screen trap to an entry point via a mounting frame. [0068] Figure 5 shows a number of embodiments of insect screen traps according to the present invention. [0069] Figure 6 shows an embodiment as used on a tent window. [0070] Figure 7 shows different views of a further embodiment of the invention as used with tent ventilation holes.

[0071] Figure 8 shows a number of views of an embodiment of an insect screen trap according to the present invention. [0072] Figure 9 shows an isometric view of an expandable configuration of insect screen trap according to a preferred embodiment of the present invention. [0073] Figure 10 is an exploded view of the insect screen trap illustrated in Figure 9. [0074] Figure 11 is a front elevation view of the insect screen trap illustrated in Figure 9 in the collapsed condition. [0075] Figure 12 is a front elevation view of the insect screen trap illustrated in Figure 11 in the expanded condition. [0076] Figure 13 is a detailed isometric view of an upper side of a lower corner portion of the insect screen trap illustrated in Figure 9. [0077] Figure 14 is a detailed view of a lower side of a lower corner portion of the insect screen trap illustrated in Figure 9. [0078] Figure 15 is a sectional end view of the frame support of the insect screen trap illustrated in Figure 12 along line A-A. [0079] Figure 16 is an exploded view of the configurations illustrated in Figure 15. [0080] Figure 17 is a sectional view of the aperture structure of the insect screen trap illustrated in Figure 12 along line B-B. DESCRIPTION OF EMBODIMENTS [0081] With reference to Figure 1A, there is shown a building 10 having a door 12 and windows 14. As a result of persons within the building 10, carbon dioxide (C02) 16 emits from any open windows 14 and attracts insects 18 such as flies and mosquitoes. [0082] Figure 1B shows a perspective view of an insect screen trap 20, as fitted to the window portion of door 12 of Figure 1A. The insect screen trap 20 comprises frame members 22 which make up a frame structure 24. [0083] Referring to Figure 1C, mesh (not shown for clarity reasons) is secured to the frame structure 24 and provides the insect screen trap 20 with a front face 26 and a rear face 28, which define a cavity 30. [0084] The front face 26 is provided with an aperture 32 through which the insects 18 are directed as a result of the inclination of the front face 26. Once the insects 18 have passed through the aperture 32, they are within the cavity 30. As the insects 18 are unable to exit the cavity 30 due to the inclination of the front face 26, they eventually die within the cavity 30. [0085] Figure 2A shows a perspective view of a frame structure 24 according to one embodiment of the invention. The frame structure 24 comprises a number of frame members 22, wherein the frame members 22 are made from wire. [0086] Figure 2B shows a perspective view of a frame structure 24 according to an alternative embodiment of the invention. The frame structure 24 comprises a number of frame members 22, wherein the frame members 22 are made from aluminium. [0087] An exploded view of a portion of frame structure 24 of the embodiment of Figure 2B is shown in Figure 3. The frame structure 24 forms a channel 34 having a web 36 connecting two flanges 38. Mesh 40 is attached to the flanges 38 of the frame structure 24 using Velcro@ 42. The mesh 40 is shown attached to the internal face of the flanges 38, however, in an alternative embodiment, Velcro@ 42 could be positioned on the external face of the flanges 38 for attachment of the mesh 40. [0088] Figure 4 shows a side view of an insect screen 20 comprising a frame structure 24, a front face 26, an aperture 32 and a cavity 30. The insect screen 20 is mounted to a wall 46, within which there is an entry point (for clarity, not shown), using a mounting frame 44. The mounting frame 44 comprises a U-shaped channel 46 which is attached to the wall 46 using fixing means 48. [0089] A number of different embodiments of insect screen traps 20 are shown in Figure 5, with features corresponding to those of the embodiment of Figure 1 numbered similarly. [0090] Figure 6 shows an insect screen trap 20 secured to an opening of a tent 50. Features corresponding to those of the embodiment of Figure 1 are numbered similarly. [0091] Figure 7 shows different views of a further embodiment of the invention as used with tent ventilation holes. Features corresponding to those of the embodiment of Figure 1 are numbered similarly. With reference to Figure 7A, there is shown a tent 50 having ventilation holes 52.

I1-) [0092] Referring to Figure 7B, as a result of the person 54 within the tent 50, carbon dioxide (C02) 16 emits from the ventilation holes 52 and attracts insects 18 such as flies and mosquitoes. The insects 18 enter via an aperture 32 (not shown for clarity) and are trapped within the cavity 30. [0093] A front view of the insect screen trap of Figure 7B is shown in Figure 7D. The insect screen trap has an aperture 32 which aligns with the tent ventilation holes 52. A top view of Figure 7D showing the cavity 30 behind the aperture 32 is shown in Figure 7C. A perspective view is shown in Figure 7E and a perspective view including the tent 50 is shown in Figure 7F. [0094] A number of views of an embodiment of an insect screen trap according to the present invention are shown in Figure 8. [0095] Figure 8A shows an insect screen trap 20 comprising frame members 22. The trap 20 further comprises mesh 40, an orifice disc 56 and a securing rod 62. [0096] A detailed view of the orifice disc 56 of Figure 8A is shown in Figure 8B. The orifice disc 56 has an opening 58 which corresponds to an aperture in the mesh 40. The orifice disc 56 also has two further openings 60 which can be used to secure the orifice disc 56 to the mesh 40. [0097] Preferably, the orifice disc is made from a bamboo node, which is the joint between hollow segments (internodes) of a bamboo pole. [0098] A view of the insect screen trap 20 of Figure 8A through the plane of the securing rod 62 is shown in Figure 8C. The securing rod 62 is connected to the side frame members 22. In this embodiment, the frame members 22 are made from bamboo, such that each frame member 22 is made from an internode section of bamboo which has been split lengthways and therefore has a semi-circular cross-section. [0099] In such an embodiment, therefore, internode sections of bamboo can be split lengthways to provide the frame members 22 and each bamboo node can be utilized to form an orifice disc 56. Further internode sections of bamboo can be split to provide securing rods 62 for insect screen traps 20. [0100] Mesh 40 is attached to the frame members 22 to form a front face 26 and rear face 28 of the insect screen trap 20. The front face 26 and rear face 28 define a cavity 30. An orifice disc 56 having an opening 58 is secured to the front face 26 such that the opening 58 corresponds to an aperture 32 in the front face 26. [0101] A detailed view of the orifice disc 56 and its connection to the securing rod 62 is shown in Figure 8D. The orifice disc 56 is fixed to the front face 26 of the insect screen trap using securing devices 64 which engage with the openings 60 of the orifice disc 56 and the securing rod 62. [0102] It can be seen from the foregoing, that the present invention provides an insect screen trap for preventing access of insects into substantially enclosed structures such as buildings. As insects are unable to escape from the cavity within the insect screen, the insect screen also assists in controlling insect populations. [0103] An alternative expandable configuration is illustrated in Figures 9 to 17. In this configuration, the frame structure 24 is adapted to be secured relative to window openings such that the frame structure 24 is substantially complimentary to the window opening by adjusting the size of the frame structure 24 to fit the window opening. In this way, a single expandable frame can be provided which will fit into a variety of entry points provided that the entry point is larger than the smallest dimension of the frame and smaller than the largest dimension of the frame. [0104] Preferably, the screen trap of this embodiment will be sold in a collapsed or retracted state as illustrated in Figures 9 and 11 and is expandable by the installer in order to fit the entry point. According to embodiment illustrated in Figures 9 to 17, the frame structure includes a number of members located relative to one another allowing at least two sides of the frame and preferably all four sides of the frame to be length adjustable. [0105] According to an illustrated embodiment, the frame is provided with four corner structures 110 and an extension arm 111 located between the corner structures 110. A lower, extendable gutter assembly is also provided. [0106] The corner structures 110 are provided in pairs, including two upper corner structures and two lower corner structures. The corner structures will normally be the same with the exception of the lower corner structures mounting the extendable gutter assembly and also cover members 112 covering openings 113 in the lower corner structures 110 to allow easy removal of trapped insects. [0107] According to a preferred embodiment, the corner structures include a pair of corner members 114 oriented at 900 to one another. Each corner member 114 is elongate and is I -) substantially U-shaped in cross-section having a base wall 115 and a pair of sidewalls 116 extending substantially perpendicularly to the base wall 115, each side wall having a free end. [0108] The base wall is 115 substantially planar. The sidewalls 116 are also substantially planar but with extensions provided thereon. Typically, each side wall has a free end 117 which is angled relative to the sidewall 116 and the free ends 117 diverge from one another as illustrated in Figure 16 in particular. [0109] A pair of attachment flanges 118 are provided extending from an outer side of each side wall 116 of each corner member 114. The attachment flanges 118 are spaced apart to define a receiving channel 119 therebetween in order to receive a spline 120 used to attach the flexible mesh 121 of the screen trap to the corner structures as illustrated in Figure 15. As illustrated in Figure 15, a flexible mesh 121 is stretched over the upper of the two flanges 118 on the corner members 114 and is forced into the receiving channel 119 between the pair of spaced apart attachment flanges 118 using the spline 120 to secure the mesh 121. [0110] According to the illustrated embodiment, the flanges 118 are provided with a rounded outer end order to allow attachment of the cover member 112 relative thereto. The cover member 112 is provided to cover an opening 113 in a base wall of the lower corner structures 114 in order to allow removal of trapped insects. [0111] According to the embodiment illustrated in Figures 15 and 16 in particular, the cover member 112 has a substantially planar base wall 122 with a pair of upstanding sidewalls 123, each side wall having a shaped free end 124 to engage the attachment flange 118 on the corner structure 114. The shaped free end 124 is C shaped in cross section in order to receive the rounded outer end of the attachment flange 118. In use, the sidewalls 123 of the cover member 112 are resiliently deformable in order to allow the cover member 112 to be deformed during attachment and then to grip the corner structure to allow sliding movement relative thereto guided by the shaped free end 124 and the lower attachment flange 118 provided on the corner structure 110. [0112] A mounting flange 125 is also provided on the inside of the sidewalls 116 of the corner member 114 to attach or mount the extension arm 11 relative to the corner members 114 as well as to allow the guided movement of the extension arm 111 relative to the corner members 114. As illustrated in Figure 16, the mounting flanges 125 extend substantially perpendicularly from the inner surface of both side walls 116 in the same plane and substantially opposite one another.

I %J [0113] A corner connector 126 is provided in order to connect the corner members 114 relative to one another. The preferred corner connector has the same cross sectional shape as the corner members or a complimentary shape. As illustrated in Figure 10, each corner member 114 is mitre cut at one end and this end receives a portion of the corner connector 126 with the corner connector fastened thereto. The other end of each corner member 114 is square cut so that adjacent corner structures can abut each other to define a collapsed or retracted condition as illustrated in Figures 9 and 11. [0114] A single elongate extension arm 111 is provided between adjacent corner structures 110 with four extension arms 111 provided in the preferred embodiment. [0115] As illustrated best in Figure 16, each of the extension arms 111 is substantially U shaped including a base wall 127 and a pair of spaced apart side walls 128. AS illustrated in Figures 15 and 16, the base wall 127 is substantially planar and abuts the base wall 115 of the corner members 114. A guide structure is provided including a channel 129 on the base wall 127 the extension arms 111 which receives a tongue 130 on the corner members 114. [0116] The sidewalls 128 of the extension arms 111 are provided with a substantially U shaped portion 131 thereon extending substantially perpendicularly inwardly from the side walls. This defines a groove 132 extending along the outside of the side walls 128 and in use, this groove 132 receives a part of the mounting flange 125 provided on the sidewalls 116 of the corner members 114 to assist with guided movement of the members relative to one another. [0117] Each of the sidewalls 128 is also provided with an angled free end 133 and normally the free ends diverge from one another. [0118] As illustrated in Figure 10 in particular, one elongate extension arm 111 is provided per side of the frame structure. The extension arm 111 is provided as a central member and the corner structures 110 are extendable and retractable relative to that central extension arm 111 as illustrated in Figure 12. [0119] An extendable gutter assembly is also provided adjacent to the lower section of the frame. The preferred gutter 134 is U-shaped as illustrated in Figure 16 but with divergent sidewalls angled outwardly and upwardly. This will typically give the gutter 134 a funnel shape in cross section. Again, the gutter can be provided with divergent free ends. [0120] Typically, the shape and configuration of the gutter assembly is such that it allows nesting inside the extension arm and/or the corner members as illustrated in Figure 15.

1 / According to the preferred embodiment illustrated in Figure 10, the gutter assembly is provided as a central member 135 attached to the extension arm 111 with a pair of side members 136 each attached to a respective corner structure 110 at a lower side such that when the corners are extended, the side members 136 move with the corners to extend away from the central member 135. Normally, the side members 136 are attached to the corner structure 110 at or adjacent to the corner. The central member 135 is mounted relative to the extension arm 111 on the bottom side of the frame structure. Normally, this mounting is achieved through the provision of one or more fasteners 137. [0121] According to a preferred embodiment illustrated in Figure 17, the aperture 32 for entry into the trap is defined by two spaced apart plates 138 that are attached to one another using one or more elongate fasteners 139 and which have a slot shape. The length of the elongate fasteners 139 is typically less than the separation of the mesh 121 at rest. This requires that the mesh 121 be pinched together at the aperture 32 by the plates according to the length of the elongate fasteners 139 and this will provide the convergent shape to the external surface of the mesh 121 which guides the insects towards the aperture 32. [0122] In the present specification and claims (if any), the word 'comprising' and its derivatives including 'comprises' and 'comprise' include each of the stated integers but does not exclude the inclusion of one or more further integers. [0123] Reference throughout this specification to 'one embodiment' or 'an embodiment' means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearance of the phrases 'in one embodiment' or 'in an embodiment' in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more combinations. [0124] In compliance with the statute, the invention has been described in language more or less specific to structural or methodical features. It is to be understood that the invention is not limited to specific features shown or described since the means herein described comprises preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims (if any) appropriately interpreted by those skilled in the art.

Claims (18)

1. An insect screen trap for preventing access of insects into a substantially enclosed structure having at least one entry point, the insect screen comprising: a) a frame structure adapted to be secured relative to the entry point, such that the frame structure is substantially complementary to the entry point and defines a rear face directed towards the interior of the substantially enclosed structure and a front face which is directed towards the exterior of the substantially enclosed structure; and b) mesh secured to the frame structure, such that a cavity is formed between the rear face and the front face and the front face comprises at least one aperture, whereby in use, an insect landing on the front face of the insect screen is directed to the cavity via the at least one aperture and is unable to exit the cavity.

2. An insect screen trap according to claim 1 wherein the frame structure and therefore the trap closes the opening which defines the entry point, such that insects cannot access the entry point past the trap.

3. An insect screen trap according to claim 1 or claim 2 wherein the frame structure is rigid.

4. An insect screen trap according to any one of the preceding claims wherein the mesh is flexible.

5. An insect screen trap according to any one of the preceding claims wherein an internal frame structure is formed to define the shape of the screen trap and the mesh is applied around the internal frame structure.

6. An insect screen trap according to any one of claims 1 to 4 wherein an external frame structure is formed from one or more frame members with the mesh attached to the frame members.

7. An insect screen trap according to claim 6 wherein each of the frame members is a substantially U-shaped channel having a base wall or web placed within the opening at the entry point and abutting members defining the opening, and a pair of spaced apart upstanding sidewalls or flanges.

8. An insect screen trap according to claim 7 wherein the mesh is provided in unitary sheets with attachment portions located at the outer edges of the sheets to attach to the respective sidewalls or flanges.

9. An insect screen trap according to claim 8 wherein the attachment portions are continuous along the edges of the sheets.

10. An insect screen trap according to claim 8 or claim 9 wherein the attachment portions attach to an inner surface of the upstanding sidewalls of each of the frame members.

11. An insect screen trap according to claim 10 wherein attaching a mesh sheet to both of the upstanding sidewalls spaces the respective mesh sheets apart.

12. An insect screen trap according to any one of the preceding claims wherein the insect mesh is reversibly secured to the frame structure for ease of cleaning and also for easy removal of insects which have collected in the cavity between the rear and front faces of the insect screen.

13. An insect screen trap according to claim 5 wherein the mesh is formed into a pocket into which the frame structure is received and the mesh closed about the frame structure.

14. An insect screen trap according to claim 13 wherein the mesh is not attached directly to the frame structure.

15. An insect screen trap according to any one of the preceding claims wherein an emptying point for the trap is provided towards a lower side or end of the trap.

16. An insect screen trap according to any one of the preceding claims wherein at least a portion of the face of the screen trap is tapered or shaped inwardly towards the aperture.

17. An insect screen trap according to any one of the preceding claims wherein the front face is oriented in the direction required, and the rear face of the trap is substantially planar and mounted to be flush with the periphery of the opening forming the entry point.

18. An insect screen trap for preventing access of insects into a substantially enclosed structure having at least one entry point, the insect screen trap comprising an inwardly tapering entry adapted to be secured relative to the at least one entry point such that a cavity is formed whereby in use, an insect is directed into the cavity via the inwardly tapering entry and is unable to exit the cavity.