AU2023255045A1 - An auxiliary framing system - Google Patents

Abstract

This invention relates to an auxiliary framing system (1) for an opening in a building structure. The system (1) includes a primary frame structure (2) mountable to the building structure and configured to extend generally about the opening. A secondary frame structure (4, 5) is releasably mountable to the primary frame structure (2) such that the secondary frame structure (4, 5) divides an open area of the primary frame structure (2) into a plurality of (e.g. four) open portions. Figure 1 1/22 2 10 0 18 103 0 22 18 o 8 3 5 ° 0 4 5 3 10 3 10 0 Figure 1

Description

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An auxiliary framing system

Related Applications

[0001] This application is a divisional application of Australian Patent Application No. 2017228710, which claims priority from AU 2016903708 filed on 15 September 2016. The entire contents of each of these earlier applications is hereby incorporated by reference.

Field of the invention

[0002] The present invention relates to systems and methods for installing a framing system to, or adjacent to, an opening in a building structure. The invention has been developed primarily as a retrofittable auxiliary framing system for existing doors and windows in residential, commercial or industrial buildings.

Background of the invention

[0003] Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.

[0004] Known double glazing insulating systems for doors and windows are generally formed as part of the door or window itself and therefore are typically installed during construction of the associated building. In instances where it is desired to replace an existing window it is necessary to conduct major structural work to the building to replace a single pane door or window with a double glazed door or window. Such work is necessarily highly labour intensive and in many cases cost prohibitive.

[0005] Methods have been devised to retrofit assemblies to a window frame of a building so as to offer a double glazing solution for existing building structures without the necessary time, effort and expense associated with replacing the entire window structure. However, these systems typically offer a permanent construction which provides an undesirable and inconvenient obstruction which restricts or hinders access to the existing window structure for cleaning, repair, and other maintenance works. Furthermore, such systems readily employ ad hoc methods of joining the framing components to account for the particular window structure design on which the system is installed.

[0006] It is an object of the present invention to overcome or ameliorate one or more of the disadvantages of the prior art, or at least to provide a useful alternative.

Summary of the invention

[0007] According to a first aspect of the invention, there is provided an auxiliary framing system for an opening in a building structure, the system including: a primary frame structure mountable to the building structure, the primary frame structure being configured to extend generally about the opening; and a secondary frame structure releasably mounted to the primary frame structure, such that the secondary frame structure divides an open area of the primary frame structure into a first open portion and a second open portion.

[0008] It will be readily understood by those of ordinary skill in the art that the auxiliary framing system can be used in conjunction with a building structure selected from a wide variety of structures. For example, the building may be configured for residential, commercial or industrial use. In addition, the building may be a fixed or permanent structure. In yet other forms, the building may be a temporary construction and/or form part of a movable object or vehicle.

[0009] Preferably, the building structure is a wall of a building. In some embodiments, the wall is an external wall of the building. In other embodiments, the wall may be an internal wall. However, it will be understood that the building structure is not limited to walls, but rather other structures such as partitions, ceilings, roofs and the like may be employed.

[0010] The opening in the building structure is preferably one of windows (including skylights), doors, walls or similar screens. However, for clarity of description and ease of understanding of the present invention, the following description will be made only with reference to windows. In this context, the term 'window' will be understood to include doors, windows, walls, screens and skylights or the like.

[0011] Preferably, the window includes a window frame in which is housed a window pane. The window pane is preferably formed of glass or other suitable material. In various embodiments, the window pane is selected to be one of transparent, translucent and opaque to meet the desired performance requirements for the location of the window. In some embodiments, the window pane is tinted. In other forms, a film can be applied to at least one side of the window pane to provide a tint to the window and/or other desired performance characteristics.

[0012] In certain embodiments, the window is an existing window of the building and the primary frame structure is retrofit to, or adjacent to, the window frame. The window may be selected from the group including, but not limited to, awning windows, casement windows, bay windows, fixed windows, sliding windows, single hung windows and double hung windows. It will be appreciated by those skilled in the art that the type of window to which the auxiliary framing system can be advantageously applied is not limited to those listed above but could be readily applied to a wide variety window designs of various shapes, sizes and configurations.

[0013] The primary frame structure preferably forms a sub-frame. Preferably, the sub-frame is mountable to or adjacent to the window frame. The primary frame structure is preferably mounted so as to be spaced by a predetermined distance from the window pane. In some embodiments, the sub-frame is mounted within the window frame. In other embodiments, the sub-frame is mounted to a front or outer surface of the window frame. The front or outer surface may face towards the interior or the exterior of the building.

[0014] In some preferred embodiments, the sub-frame is mounted to a reveal surrounding (or extending from) the window frame. In other embodiments, the reveal can be integrally formed with the window frame. In yet other embodiments, the sub frame can be mounted directly to the window frame.

[0015] The sub-frame is preferably formed from a plurality of sub-frame members. Preferably, the sub-frame includes four sub-frame members, including a top member, a bottom member and two side members. The plurality of sub-frame members are preferably arranged so that the sub-frame forms an uninterrupted mating surface against which a portion of a glazing panel can be mounted (e.g. in face-to-face abutment). Preferably, a butt join is formed between ends of adjoining sub-frame members. In other embodiments, a mitred join is formed between ends of adjoining sub-frame members. Preferably, each sub-frame member is elongate and has a generally rectangular cross-sectional profile.

[0016] It will be appreciated by those skilled in the art that the sub-frame can be advantageously retrofitted to (or adjacent to) the rails and stiles of the frame of an existing window (or door), and be readily customised to the particular size of the existing window. Accordingly, the sub-frame is not limited to constructions including four sub-frame members, but rather can include any suitable number of members to suit the particular shape of the window to which the sub-frame is to be installed. For example, the sub-frame may be formed of three members to suit a triangular shaped window. Similarly, the sub-frame members may be straight or curved.

[0017] The sub-frame is preferably mounted/attached to the rails and stiles of the window frame with a suitable fastening means. The fastening means is preferably a fastener selected from the group including mechanical fasteners such as screws, nails, rivets, pins, staples or the like, and bonding fasteners such as adhesives (e.g. glues) and double-sided bonding tape or the like.

[0018] In certain embodiments, the sub-frame members may be formed of a metal or plastic material. In some embodiments, the sub-frame members are formed of an insulating material such as for example, polyvinyl chloride (PVC), acrylonitrile styrene acrylate (ASA) material. Preferably, the PVC or ASA material is foamed.

[0019] In some embodiments, the secondary frame structure includes a mullion mountable to the primary frame structure to extend across the open area of the primary sub-frame structure which bounds the window. Preferably, the mullion is configured to extend from the top member of the sub-frame to the lower member of the sub-frame. In such embodiments, the secondary frame structure may include one or more transoms extending from the mullion to the left-hand side sub-frame member. In some embodiments, the secondary frame structure may include one or more transoms extending from the mullion to the right-hand side sub-frame member.

[0020] In one preferred embodiment, the secondary frame structure includes one mullion extending from the top sub-frame member to the bottom sub-frame member, and two transoms where the first transom extends from the mullion to the left-side sub frame member and the second transom extends to the right-hand side sub-frame member. In this embodiment, the secondary frame structure divides the open area of the sub-frame into four distinct open portions.

[0021] In other embodiments, the secondary frame structure includes a transom mountable to the primary frame structure to extend across the open area of the primary sub-frame structure which bounds the window. Preferably, the transom is configured to extend from the left-hand side member of the sub-frame to the right-hand side member of the sub-frame. In such embodiments, the secondary frame structure may include one or more mullions extending from the transom to the top sub-frame member. In some embodiments, the primary structure may include one or more mullions extending from the transom to the bottom sub-frame member.

[0022] As will be described in further detail below, the mullions and transoms are advantageously configured to be mounted in a manner which enables each to be readily removed from the sub-frame, thereby providing substantially unobstructed access to the existing window pane for cleaning or maintenance activities, as required. In addition, the manner in which the mullions and transoms are interconnected to one another and to the sub-frame advantageously provides a simple, efficient and common solution for use with many different existing window designs.

[0023] Preferably, the mullions and transoms are formed from an extruded elongate element. The mullions and transoms preferably both have the same cross-sectional profile. It will be appreciated that the use of an elongate element with a constant cross section profile for forming the mullions and transoms of the secondary frame structure is particularly advantageous for customising and retrofitting the secondary frame structure to existing windows, which come in many different shapes and sizes.

[0024] In one preferred embodiment, the cross-sectional profile of the elongate element is in the form of a channel. The channel is preferably C-shaped. The channel is not limited to a C-shaped profile, rather the channel may be of any suitable cross section such as U-shaped, T-shaped or other profile shapes.

[0025] In some embodiments, the elongate element has a base web and respective side edge rails extending from the base web. In certain embodiments, each side edge rail is generally L-shaped, having a first (wall) portion extending from and generally perpendicular to the base web and a second (lip) portion extending orthogonally to the first portion (i.e. so as to be substantially parallel to the base web). In some embodiments, the second portions on the side edge rails extend inwardly towards each other (i.e. towards the centre of the base web). In other embodiments, the second portions on the side edge rails extend outwardly away from each other.

[0026] Preferably, the elongate member includes a stiffening element extending longitudinally along its length. The stiffening element is preferably a rib-type member extending from base web. Preferably, the rib-type member extends along the midline of the base web. The stiffening member is preferably arranged on the opposite side of the base web to that of the side edge rails.

[0027] In certain embodiments, the stiffening member is longer than the base web such that the ends of the stiffening member extend past the respective ends of the base web, thereby at least partially overlapping and engaging the top and bottom sub-frame members, in use. In some embodiments, the length of the overlap is substantially equivalent to the thickness of the associated sub-frame member. Preferably, the length of the base web is substantially the same as the distance between the top and bottom sub-frame members such that the channel portion of the elongate member is close fittingly (or snugly) received between the two respective sub-frame members. In certain embodiments, the elongate member is first cut to length then a second process of cutting, punching or the like is used to remove predetermined end portions of the base web and rail in order to shorten the base web and rails relative to the stiffening member, thereby providing the desired overlap described above.

[0028] In this arrangement, it will be appreciated that the ends of the stiffening member effectively act to locate the mullion relative to the sub-frame members to which the mullion is mounted. In some embodiments, the ends of the stiffening member are adapted to locate the mullion such that the surface of the base member from which the stiffening member extends is substantially flush with the associated face of the respective sub-frame members. In other embodiments, a separate locating means may be provided for locating the mullion relative to the sub-frame.

[0029] Similarly, each transom can be located relative to the mullion and the associated sub-frame member to which the transom is mounted. In some embodiments, the ends of the stiffening member are adapted to locate each transom such that the surface of the base web from which the stiffening member extends is substantially flush with base web of the mullion and the associated face of the respective sub-frame member. In other embodiments, a separate locating means may be provided for locating the transoms relative to the mullion and the sub-frame.

[0030] In some embodiments, one or more mounting brackets is/are attachable to the primary frame structure (sub-frame), the one or more mounting brackets being adapted, upon installation, to facilitate mounting of the secondary frame structure (e.g. mullion/transom) to the primary frame structure (e.g. sub-frame).

[0031] In some embodiments, a mounting bracket is provided for each sub-frame member. For example, in embodiments employing top, bottom, left- and right-side sub frame members, there will be typically be four mounting brackets supplied; one bracket associated with each member.

[0032] In embodiments employing a mullion which extends from the top sub-frame member to the bottom sub-frame member, the mounting brackets associated with the top and bottom sub-frame members will preferably be aligned so that the mullion mounted thereto will extend in a direction generally orthogonal to the top and bottom sub-frame members (e.g. vertically).

[0033] In embodiments employing a transom which extends from the left-side sub frame member to the right-side sub-frame member, the mounting brackets associated with the left- and right-side sub-frame members will preferably be aligned so that the transom mounted thereto will extend in a direction generally orthogonal to the left- and right-side sub-frame members (e.g. horizontally).

[0034] In some embodiments, each mounting bracket is attached at the centre of the associated sub-frame member, such that the secondary frame structure is arranged symmetrically with respect to the primary frame structure (e.g. such that the first open portion and second open portion are substantially the same size). In other embodiments, the mounting brackets may be mounted in predetermined selected positions offset from the centre of the sub-frame members. It will be appreciated by those skilled in the art that the mounting brackets provide flexibility in terms of being selectively mountable to various mounting positions along the respective sub-frame members, thereby enabling the open portions to be formed to desired shapes and sizes. In some embodiments, the mounting brackets may be mounted such that the secondary frame structure members are arranged in a desired position and extend at a desired orientation (e.g. substantially parallel or angled) relative to existing frame members or dividers of the existing window structure.

[0035] Each mounting bracket is preferably attached to the respective sub-frame member with a suitable bracket attachment means. In some embodiments, the bracket attachment means is a fastener selected from the group including mechanical fasteners such as screws, nails, rivets, pins, staples or the like, and bonding fasteners such as adhesives (e.g. glues) and double-sided bonding tape or the like.

[0036] In some embodiments, each mounting bracket is generally L-shaped with a base for engaging the sub-frame and a support arm extending orthogonally from the base, the arm being configured to support an end of an element of the secondary frame structure (e.g. mullion or transom).

[0037] Preferably, the base has at least one mounting hole extending therethrough, the or each mounting hole being configured to receive a mounting screw for securing the mounting bracket to the respective sub-frame member. In one preferred embodiment, each mounting bracket has two mounting holes. Preferably, the or each mounting hole is a countersunk formation such that a head of each screw is received within the base of the mounting bracket.

[0038] The support arm preferably has a passage associated and aligned with each mounting hole, the passage providing access to the mounting hole for the respective mounting screw. In some embodiments, the passage acts to guide the respective mounting screw into alignment with the associated mounting hole. In some embodiments, the passage is an open ended slot. The open ended slot may be generally C-shaped or rounded so as to complement the shape of the head of the mounting screw.

[0039] Preferably, the side edges of the support arm are notched to define side edge ribs, each side edge rib having an external profile.

[0040] In some embodiments, a spacer may be provided for reducing the space or gap between at least some the adjacent components, thereby limiting the space between these components to provide a substantially tight or snug fit (i.e. with limited play between the components). In some embodiments, the spacer means is adapted to reduce the space between the mounting bracket and the respective mullion or transom. In some embodiments, the spacer means is adapted to reduce the space between the mounting bracket and the respective cover member. In some embodiments, the spacer means is adapted to reduce the space between connecting bracket and the respective cover member. In certain embodiments, the spacer may be a single element or a plurality of elements which are arranged to provide a desired thickness to the spacer. In other embodiments, the spacer may be releasably mounted to the mounting bracket (e.g. on the support arm) and/or on the cover member (e.g. on the cover plate). Preferably, the releasably mounted spacer is configured such that, if the gap between the components is greater than the thickness of the spacer, the spacer will remain in place so as to reduce the clearance space between the components. Preferably, the releasably mounted spacer is configured such that, if the gap between the components is less than the thickness of the spacer, the spacer will be broken off (or bent over) when the respective components are moved into position (i.e. over the top of each other). In some embodiments, the spacer may have one or more releasably mounted fins or ribs mounted to the inner or outer face of the support arm of the mounting bracket, the fins or ribs being adapted to shear off when the fins or ribs come into contact with the adjacent mullion/transom or cover member, as the components are moved into the mounting position.

[0041] It will be appreciated that the option for providing a spacer between adjacent components to provide a substantially snug fit therebetween is particularly advantageous for overcoming discrepancies in component sizes arising from normal manufacturing process (e.g. during the extruding process for manufacturing the components).

[0042] In certain embodiments, each mounting bracket has a locking element. The locking element is preferably biased to a locking position. In some embodiments, the locking element is in the form of a self-biased locking tongue. The locking tongue is preferably configured to be cantilevered, whereby the locking tongue is biased to its locking position by the resilience of the material from which the mounting bracket is formed. In other embodiments, a separate independent biasing member such as a spring may be used to provide the necessary biasing force. Preferably, the locking tongue is centrally arranged within the support arm. The distal end of the locking tongue preferably has a locking member. In some embodiments, the locking member may be in the form of a pin, ball, half-sphere or similar projecting upwardly from the locking tongue, and preferably generally orthogonally to the longitudinal axis of the locking tongue. In some embodiments, the locking member may have a tapered face to facilitate relative sliding face-to-face movement with respect to other components (e.g. cover member) between engaged and/or disengaged positions.

[0043] Preferably, each mounting bracket is sized to have a width which enables it to be received within the open region of the channel of the respective mullion or transom.

[0044] In some embodiments, a cover member is associated with each end of the respective mullion or transom. Preferably, the cover member is slidably engagable with the rails of the mullion or transom. The cover member preferably includes a cover plate and a pair of side edge legs extending from the cover plate. Preferably, each side edge leg preferably has an external profile which is of complementary configuration to the inner profile of the rail and lip of the mullion such that the cover member can be slidably received within the mullion or transom. Each side edge leg preferably has an internal profile which is of complementary configuration to the external profile of the side edge ribs of the support arm of the mounting bracket. Preferably, each side edge leg has a stepped configuration (e.g. S-shaped configuration).

[0045] Preferably, the cover plate has a receiving formation for receiving the locking member of the mounting bracket to secure the mullion or transom to the respective mounting bracket. In some embodiments, the receiving formation is a through hole. In some embodiments, the through hole is one of circular, square and rectangular. The receiving hole is preferably centrally located within the cover plate. It will be appreciated that the through hole facilitates releasing the locking member from the through hole (e.g. by pressing with a finger of a user), against the action of the biased locking element, to enable the cover member to be slid away from the mounting bracket to dismount the mullion or transom, as and when required. In certain embodiments, the cover plate has an engagement formation which can be engaged in a manner which enables a sliding force to be applied to the cover to slide the cover member along the respective mullion or transom. In some embodiments, the engagement formation is in the form of a opening, hole, notch, groove, or protrusion. In some embodiments, the engagement formation is adapted to be engaged by a finger of a user. In other embodiments, the engagement formation is adapted to be engaged by a lever (e.g. where spaced is limited). Preferably, the lever has a head for engaging the engagement formation on the cover plate. In some embodiments, the lever head may have a hook-type formation, tongs, or other suitable gripping or engaging mechanism for engaging the engagement formation on the cover plate. In certain embodiments, the lever head may have a first element adapted to be received in the receiving formation (and to disengage the locking member (e.g. by depressing the locking member)) and a second element adapted to be received in the engagement formation.

[0046] In some embodiments, the secondary frame structure includes a mullion and two transoms, the mullion extending from the top sub-frame member to the bottom sub frame member, one transom extending between the mullion and the left-side sub-frame member, and the other transom extending between the mullion and the right-side sub frame member. The distal end of each transom is connected to the mounting brackets on the respective sub-frame member as described above.

[0047] Preferably, a connecting bracket is provided to facilitate mounting of the proximal ends of the transoms to the mullion. The connecting bracket preferably slidably engages with the mullion. Preferably, the connection bracket has a body portion in which is defined a connecting formation to facilitate sliding engagement with the rails and lips of the mullion. The connecting formation is preferably of complementary shape to that of the rails and lips to provide secure close fitting engagement of the connecting member onto the mullion.

[0048] In some embodiments, the body portion includes at least one hole for receiving a fastener for securing the connecting bracket to the mullion; at a desired position along the length of the mullion. Preferably, the body portion has two holes. The or each hole in the body portion is preferably a through hole. The fastener is preferably a screw such as, for example, a grub screw.

[0049] In certain embodiments, the connecting bracket has a connecting arm projecting outwardly from each side of the body portion, each connecting arm being configured to the proximal end of the respective transom. Each connecting arm is preferably configured to be received within the channel at the proximal end of the respective transom. In other embodiments, the connecting bracket may only have one connecting arm should only one transom be required. Alternatively, the second connection arm may be configured such that it can be removed from the connecting bracket, by way of cutting, punching, folding or some other suitable process.

[0050] In certain embodiments, each connecting arm has a locking element. The locking element is preferably biased to a locking position. In some embodiments, the locking element is in the form of a self-biased locking tongue. The locking tongue is preferably configured to be cantilevered, whereby the locking tongue is biased to its locking position by the resilience of the material from which the connecting bracket is formed. In other embodiments, a separate independent biasing member, such as a spring, may be used to provide the necessary biasing force. Preferably, the locking tongue is centrally arranged within the connecting arm. The distal end of the locking tongue preferably has a locking member. In some embodiments, the locking member may be in the form of a pin, ball, half-sphere or similar member projecting upwardly from the locking tongue, and preferably generally orthogonally to the longitudinal axis of the connecting arm. In some embodiments, the locking member may have a tapered face to facilitate relative sliding face-to-face movement with respect to other components (e.g. cover member) between engaged and/or disengaged positions.

[0051] Preferably, each connecting arm is sized to have a width which enables it to be received within the open region of the channel at the proximal end of the respective transom. Preferably, the side edges of the connecting arm are notched to define side edge ribs, each side edge rib having an external profile.

[0052] In some embodiments, a cover member is associated with the proximal end of each transom. Preferably, the cover member is slidably engage with the rails of the transom. The cover member preferably includes a cover plate and a pair of side edge legs extending from the cover plate. Preferably, each side edge leg preferably has an external profile which is of complementary configuration to the inner profile of the rail and lip of the transom such that the cover member can be slidably received within the transom. Each side edge leg preferably has an internal profile which is of complementary configuration to the external profile of the side edge ribs of the connecting arm of the connecting bracket. Preferably, each side edge leg has a stepped configuration (e.g. S-shaped configuration).

[0053] Preferably, the cover plate has a receiving formation for receiving the locking member of the connecting arm to secure the transom thereto. In some embodiments, the receiving formation is a through hole. The receiving hole is preferably centrally located within the cover plate. It will be appreciated that the through hole facilitates releasing the locking member from the through hole, against the action of the biased locking element, to enable the cover member to be slid away from the connecting arm to dismount the transom, as and when required.

[0054] In various embodiments, two or more glazing panels will be releasably mounted to the frame assembly including the primary frame structure and the secondary frame structure. In those embodiments employing a single mullion or transom, there will be two glazing panels, one arranged on either side of the mullion or transom. In embodiments employing a single mullion and two transoms, there will be four glazing panels, one arranged on the various quadrants of the frame assembly. It will be appreciated by those skilled in the art that the number and configuration of mullions, transoms and glazing panels is not limited to those listed above, but rather may include suitable configuration, including symmetric and asymmetric configurations.

[0055] Preferably, the glazing panel is formed from glazing frame members, including, top, bottom and side members. Each glazing frame member has a receiving formation for receiving a corresponding edge of a glazing pane. The receiving formation is generally U-shaped and adapted to provide a snug or close-fit for the corresponding edge of the glazing pane.

[0056] Preferably, the glazing pane is made from a thermoplastic material, such as an acrylic or polycarbonate. In certain preferred embodiments, the glazing pane is formed from optical grade acrylic. The chemical and physical properties of the thermoplastic material provide the glazing pane with a number of advantageous properties, including: acrylic/polycarbonate has superior insulation properties to glass and delivers greater results when compared with traditional methods of double glazing; acrylic is much safer and lighter than glass and less likely to shatter; the acrylic provides optical clarity so as not to distort the view through the window when the glazing panel is in place. In addition to the material selected for the glazing pane, the glazing pane can be formed a desired thickness so as to provide the optimum performance for a particular application. It will of course be appreciated that the glazing pane is not limited to the materials listed above, and may be formed of any suitable material including, for example, glass. In certain embodiments, the glazing pane may be formed of a transparent, translucent or opaque material.

[0057] In some preferred embodiments, a control film is applied to the window pane or the glazing pane or both. In some embodiments, the control film is a solar control film for reflecting heat and/or for tinting the glazing panel to reduce glare. In certain embodiments, the solar control film is applied to an inner surface of the existing window pane so as to reflect heat before it enters the air cavity. In other embodiments, the control film may be applied to the exterior surface of the existing window pane. In some embodiments, a control film may be applied to the interior and/or exterior surface of the glazing pane (as well as, or alternatively to, applying a film to the existing window pane). It will be appreciated by those skilled in the art that the control film can advantageously enhance the insulation of radiant heat and thereby improve the overall performance of the system.

[0058] Preferably, the glazing panel has a handle for facilitating mounting to and removal from the sub-frame, as desired. The handle preferably includes a first handle portion located on a first side sub-frame member and a second handle portion located on the opposed second side sub-frame member, allowing the glazing panel to be handled with two hands. In some embodiments, the first and second handle portions may be mounted on the left and right side frame members, respectively. In other embodiments, the first and second handle portions may be mounted on the top and bottom frame members, respectively. In certain embodiments, the handle is adapted to be releasably mountable to the glazing panel such that the handle can be attached to the panel when the glazing panel is to be lifted or moved, and the handle can be removed when not is use. For example, the handle may have one or more suction pads or cups for releasably attaching the handle (or each handle portion) to the glazing pane.

[0059] Preferably, a mounting means is provided for releasably mounting each glazing panel to the primary and secondary frame structure assembly (e.g. sub-frame, mullion, and transoms). The mounting means is preferably magnetic. Preferably, the mounting means includes a first magnetic element associated with the primary and secondary frame structure and a second magnetic element associated with each glazing panel, the first and second magnetic elements acting in combination to enable releasable mounting of the respective glazing panel to the primary and secondary frame structure assembly.

[0060] In some preferred embodiments, the first magnetic element includes an elongate strip (e.g. thin strap) formed of a magnetic material (including magnetised materials), the magnetic strip being mounted in face-to-face relationship to an inner face of the sub-frame. A magnetic strip is preferably applied to each sub-frame member to create a continuous magnetic surface around the inner face of the sub-frame. Preferably, a magnetic strip is also applied to the secondary frame structure. In some embodiments, a single magnetic strip is applied to the base web of the secondary frame structure. In other embodiments, a first magnetic strip is applied to the base web on one side of the stiffening member and a second magnetic strip is applied to the base web on the other side of the stiffening member. It will be appreciated that the use of two magnetic strips on the base web of the mullion (and transoms, if used) will provide a distinct continuous magnetic surface for each glazing panel.

[0061] The magnetic strips may be adhered to the inner face of the associated sub frame element by, for example, double-sided bonding tape. The width of each magnetic strip is preferably substantially the same as the height of the associated sub-frame element to which it is mounted. In certain embodiments, the first magnetic element can reinforce the joints of the sub-frame, improving its structural integrity.

[0062] Preferably, the second magnetic element has a mating surface adapted to abut against the first magnetic element in face-to-face magnetic sealing engagement. The second magnetic element is preferably an elongate strip formed of a magnetic material, the magnetic strip being mounted to an inner face of the glazing panel frame. A second magnetic element is preferably mounted to each glazing panel frame member to create a continuous magnetic surface around the inner face of the glazing panel such a continuous sealing engagement with the first magnetic element is possible.

[0063] Preferably, each glazing panel frame member has a mounting formation (e.g. channel, groove, etc) in which the second magnet element is received (e.g. securely embedded or otherwise housed). In some embodiments, the second magnetic element is mounted within the mounting formation by way of a press-fit, snap-fit, lengthwise sliding fit, or otherwise retained within the mounting formation by way of a suitable retaining means (e.g. fastener, clip or the like). The glazing panel frame members are arranged to form a continuous mounting channel around the perimeter edge of the glazing pane.

[0064] The magnetic mounting means advantageously allows the glazing panel to be easily removed and replaced to the sub-frame for cleaning or ventilation, as desired. The magnetic mounting means also provides a long lasting magnetic seal, which will not diminish over time. In addition, the magnetic mounting means seals the air cavity to lower the air infiltration rate, improving the performance of the insulating system. The seal provided by the magnetic mounting means is preferably secure and air tight around the perimeter of the glazing panel.

[0065] In preferred embodiments, the glazing panel is mountable in continuous sealing engagement with the sub-frame. The sub-frame preferably forms a thermal break about a periphery of the glazing panel. Preferably, the glazing panel is mounted to create an (insulating) air cavity between the glazing panel and the window pane.

[0066] Preferably, the sub-frame is mounted on an inner side of the existing window, more preferably, on an inner side of the window pane of the existing window, such that the air cavity is formed on the inner side of the existing window. It will be appreciated that mounting of the sub-frame on the inner side of the existing window will provide a number of advantages in terms of practicality and security.

[0067] The sub-frame can be mounted to (or adjacent to) the reveal of the existing window to provide the air cavity with a desired depth (i.e. the distance between the window pane and the glazing pane). Preferably, the sub-frame is mounted so that the glazing pane is substantially parallel to the existing window pane, and wherein the depth of the air cavity is substantially constant over the area of the glazing panel.

[0068] The depth of the air cavity can be set to a predetermined depth (within the boundaries of the window frame/reveal) to provide desired operating performance characteristics of the insulating system. That is, the depth of the air cavity determines, in part, the acoustic and thermal performance of the system. In particular, for an insulating system of a given size and materials, a balance between desired sound and thermal insulating performance can be achieved by selecting the depth of the air cavity.

[0069] For applications where noise reduction is the major performance requirement, the depth of the air cavity should be increased (i.e. the bigger the gap, the better the noise reduction). In certain embodiments, an air cavity depth of about 100mm can provide optimal noise reduction.

[0070] In those applications in which thermal insulation is the primary performance requirement, it has been found that an air cavity depth in the range of about 40 to 70mm can provide optimal thermal insulation.

[0071] According to another aspect of the invention, there is provided an auxiliary framing system for an opening in a building structure, including: one or more primary frame elements mountable generally about the opening; at least one secondary frame element removably mountable to the one or more primary frame elements so as to extend across the opening, the second frame element dividing the opening to provide a first open section and a second open section; a first panel releasably mountable to a portion of the primary frame elements to thereby cover the first open section; and a second panel releasably mountable to a portion of the primary frame elements to thereby cover the second open section.

Brief description of the drawings

[0072] Preferred embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings in which:

[0073] Figure 1 shows a rear perspective view of a first embodiment of an auxiliary framing system according to the invention;

[0074] Figure 2 shows a front perspective view of the framing system of Figure 1;

[0075] Figure 3 shows a front view of the framing system of Figure 1;

[0076] Figure 4 shows a rear view of the framing system of Figure 1;

[0077] Figure 5 shows a rear perspective view of a mullion/transom of the framing system of Figure 1;

[0078] Figure 6 shows a front perspective view of the mullion/transom of Figure 5;

[0079] Figure 7 shows an end view of the mullion/transom of Figure 5;

[0080] Figure 8 shows a rear perspective view of a mounting bracket of the framing system of Figure 1;

[0081] Figure 9 shows a front perspective view of the mounting bracket of Figure 8;

[0082] Figure 10 shows a rear view of the mounting bracket of Figure 8;

[0083] Figure 11 shows a front view of the mounting bracket of Figure 8;

[0084] Figure 12 shows an end view of the mounting bracket of Figure 8;

[0085] Figure 13 shows a rear perspective view of a cover member of the framing system of Figure 1;

[0086] Figure 14 shows a rear perspective view of the cover member of Figure 13;

[0087] Figure 15 shows an end view of the cover member Figure 14;

[0088] Figure 16 shows a rear perspective view of a connecting bracket of the framing system of Figure 1;

[0089] Figure 17 shows a front perspective view of the connecting bracket of Figure 16;

[0090] Figure 18 shows a front view of the connecting bracket of Figure 16;

[0091] Figure 19 shows an end view of the connecting bracket of Figure 16;

[0092] Figure 20 shows a rear view of the connecting bracket of Figure 16;

[0093] Figure 21 shows a top view of the connecting bracket of Figure 16;

[0094] Figure 22 shows a rear perspective view of a second embodiment of an auxiliary framing system according to the invention;

[0095] Figure 23 shows a rear view of the framing system of Figure 22;

[0096] Figure 24 shows an end view of a mullion of the framing system of Figure 22;

[0097] Figure 25 shows a side view of the mullion of Figure 24;

[0098] Figure 26 shows a rear perspective view of a connecting bracket of the framing system of Figure 22;

[0099] Figure 27 shows a front perspective view of the connecting bracket of Figure 26;

[00100] Figure 28 shows a rear perspective view of a third embodiment of an auxiliary framing system according to the invention;

[00101] Figure 29 shows a rear perspective view of a mullion of the framing system of Figure 28;

[00102] Figure 30 shows a rear perspective view of a transom of the framing system of Figure 28;

[00103] Figure 31 shows an end view of the transom of Figure 30;

[00104] Figure 32 shows a rear view of the transom of Figure 30;

[00105] Figure 33 shows a rear view of a fourth embodiment of an auxiliary framing system according to the invention;

[00106] Figure 34 shows a rear perspective view of a mounting bracket of the framing system of Figure 33;

[00107] Figure 35 shows a front perspective view of the mounting bracket of Figure 34;

[00108] Figure 36 shows a rear view of the mounting bracket of Figure 34;

[00109] Figure 37 shows a side view of the mounting bracket of Figure 34;

[00110] Figure 38 shows an end view of the mounting bracket of Figure 34;

[00111] Figure 39 shows a rear perspective view of a cover member of the framing system of Figure 33;

[00112] Figure 40 shows a front perspective view of the cover member of Figure 39

[00113] Figure 41 shows a rear perspective view of a connecting bracket of the framing system of Figure 33; and

[00114] Figure 42 shows a front perspective view of a connecting bracket of Figure 41.

Preferred embodiments of the invention

[00115] Referring to the drawings, the invention provides an auxiliary framing system 1 for an opening such as a door or window in a building structure (e.g. wall). The framing system 1 is particularly suitable for retrofitting to an existing door or window to provide a double glazing solution for the existing structure, thereby improving the insulating performance of the window.

[00116] The window includes a window frame in which is housed a window pane. The window pane is preferably formed of glass or other suitable material. The window pane can be transparent, translucent or opaque to meet the desired performance requirements for the location of the window. In some embodiments, the window pane is tinted. In other forms, a control film can be applied to at least one side of the window pane to provide a tint to the window and/or other desired performance characteristics.

[00117] For clarity of description, the following description of the figures will be made with specific reference to windows. However, it will be appreciated by those skilled in the art that the framing system 1 is equally suitable for insulating applications relating to doors, walls, screens and skylights or similar open areas. It will also be appreciated that the framing system 1 is readily usable in a wide variety of building applications including residential, commercial and industrial applications. The framing system can also be applied to fixed, temporary, portable or mobile dwellings. In this context, the term 'window' will be understood to include doors, windows, walls, screens and skylights or the like.

[00118] Referring to Figures 1 to 4, the auxiliary framing system 1 includes a primary frame structure in the form of a sub-frame 2. The sub-frame 2 is mountable to, or adjacent to, the window frame of the existing window so as to extend generally about the window opening. The sub-frame 2 is formed from a plurality of sub-frame members 3 which are mounted to the window frame to form a generally rectangular sub-frame, substantially corresponding with the open area of the window.

[00119] In the illustrated embodiment, the sub-frame 2 includes four sub-frame members 3, including a top member, a bottom member, a left-side member, and a right side member. Each sub-frame member 3 is preferably adhered to the window frame with a double-sided bonding tape (not shown). It will be appreciated by those skilled in the art that the sub-frame 2 can be advantageously retrofitted to, or adjacent to, the frame of the window and is readily customised to the particular size of the window.

[00120] The sub-frame members 3 are mounted to the window frame such that the sub-frame 2 is spaced from the window pane by a predetermined distance. Each sub frame member 3 is elongate with a generally rectangular cross-section and is preferably formed of a suitable insulating material.

[00121] A secondary frame structure is releasably mounted to the sub-frame 2. In the illustrated embodiment, the secondary frame structure includes a vertical mullion 4 and two horizontal transoms 5. The mullion 4 and transoms 5 are mountable to the sub frame 2 to extend across the open area of the sub-frame to divide the open area into four distinct open area portions. As described in greater detail below, the sub-frame 2, mullion and transoms provide a mounting surface against which glazing panels can be mounted. In the illustrated embodiment, one glazing panel is mounted to cover each of the four distinct open area portions; that is, four separate glazing panels are used.

[00122] The mullion 4 is mounted to the sub-frame 2 such that it extends from the top sub-frame member 3a to the bottom sub-frame member 3b (e.g. in a generally vertical direction). One transom 5 is mounted to extend between the left-side sub-frame member 3c and the left-side edge of the mullion 4 (e.g. in a generally horizontal direction). The second transom 5 is mounted to extend between the right-side sub frame member 3d and the right-side edge of the mullion 4 (e.g. in a generally horizontal direction).

[00123] The mullion 4 and transoms 5 are advantageously configured to be mounted in a manner which enables each to be readily removed from the sub-frame 2. The ability to remove the mullion 4 and transoms 5 is particularly advantageous as it facilitates substantially unobstructed access to the existing window pane for cleaning or maintenance activities, as required.

[00124] As most clearly seen in Figures 5 to 7, the mullion 4 and transoms 5 are formed from elongate elements having a constant cross-sectional profile. In the illustrated embodiments, the mullion 4 and transoms 5 have the same cross-sectional profile. It will be appreciated that the use of an elongate element with a constant cross section profile for forming both the mullions and transoms of the secondary frame structure is particularly advantageous for customising and retrofitting the secondary frame structure to various existing windows designs, which come in many different shapes and sizes.

[00125] Referring to Figure 7, the cross-sectional profile of the elongate element is in the form of a C-shaped channel 6. The channel 6 has a base web 7 and respective side edge rails 8 extending from the base web 7. Each side edge rail 8 is generally L shaped, having a first (wall) portion extending from and generally perpendicular to the base web and a second (lip) portion extending orthogonally to the first portion (i.e. so as to be substantially parallel to the base web). In this embodiment, the second portions on the side edge rails extend inwardly towards each other (i.e. towards the centre of the base web).

[00126] The mullion 4 and transoms 5 includes a stiffening element in the form of a rib 9, projecting from the opposite side of the base web to that in which the side edge rails extend. The stiffening rib 9 is preferably arranged to extend along the midline of the base web.

[00127] As most clearly seen in Figures 5 and 6, the stiffening rib 9 is longer than the base web 7 such that the ends of the rib 9 extend past the respective ends of the base web 7. Referring to Figures 2 and 3, the length of the overlap is equivalent to the thickness of the sub-frame members such that both ends of the rib 9 of the mullion 4, and the outer end of the rib of each transom overlap and engage the respective sub frame members 3. The length of the base web is substantially the same as the distance between the top and bottom sub-frame members such that the channel portion of the elongate member is close-fittingly (or snugly) received between the two respective sub frame members. To provide the desired difference in length between the base web 7 and rib 9, the elongate member is first cut to length. A second process of cutting, punching or the like is used to remove predetermined end portions of the base web and rail in order to shorten the base web and rails relative to the stiffening rib, thereby providing the desired overlap described above.

[00128] In this arrangement, it will be appreciated that the ends of the stiffening member effectively act to locate the mullion relative to the sub-frame members to which the mullion is mounted. The ends of the stiffening rib also act to locate the mullion and transoms such that the surface of the base member from which the stiffening member extends is substantially flush with the associated face of the respective sub-frame members.

[00129] Similarly, each transom can be located relative to the mullion and the associated sub-frame member to which the transom is mounted. In some embodiments, the ends of the stiffening member are adapted to locate each transom such that the surface of the base web from which the stiffening member extends is substantially flush with the base web of the mullion and the associated face of the respective sub-frame member.

[00130] As most clearly shown in Figure 4, four mounting brackets 10 are attached to the sub-frame 2, one on each of the top, bottom, left- and right-side sub-frame members 3. The mounting brackets 10 facilitate mounting of the mullion 4 and transoms 5 to the sub-frame members 3. Each mounting bracket is sized to have a width which enables it to be received within the open region of the channel of the respective mullion or transom.

[00131] In the illustrated embodiment, the mullion 4 extends from the top sub-frame member to the bottom sub-frame member. The mounting brackets associated with the top and bottom sub-frame members are aligned such that when the mullion is mounted thereto it will extend in a direction generally orthogonal to the top and bottom sub-frame members (e.g. vertically). The mounting brackets associated with the left- and right side sub-frame members will be aligned so that the transoms mounted thereto will extend in a direction generally orthogonal to the left- and right-side sub-frame members (e.g. horizontally).

[00132] Each mounting bracket is attached to the respective sub-frame member with a suitable bracket attachment means in the form of a mounting screw, such as, for example, a socket head cap screw.

[00133] Referring to Figures 8 to 12, each mounting bracket 10 is generally L-shaped with a base 11 for engaging the sub-frame member 3 and a support arm 12 extending orthogonally from the base 11. The support arm 12 is configured to support the outer end of the associated mullion or transom.

[00134] The base 11 has two countersunk mounting holes 13 extending through the base. Each mounting hole is configured to receive a mounting screw (not shown) for securing the mounting bracket to the respective sub-frame member 3.

[00135] The support arm 12 has a passage 14 associated with, and aligned with, each mounting hole 13. The passage 14 provides access to the mounting hole 13 for the respective mounting screw. The passage also acts to guide the respective mounting screw into alignment with the associated mounting hole. In the illustrated embodiment, the passage is an open ended generally C-shaped slot, complementing the shape of the head of the set screw.

[00136] As is most clearly shown in Figure 8, the side edges 15 of the support arm 12 are notched to define side edge ribs with a stepped external profile.

[00137] Each mounting bracket 10 has a locking element in the form of a self-biased cantilevered locking tongue 16. The locking tongue 16 is cantilevered from a fixed end to a free end, on which a locking member 17 in the form of a half-sphere projection is arranged. The locking member 17 is biased to its locking position by the resilience of the material from which the mounting bracket/locking tongue is formed, and due to its cantilevered formation. As best seen in Figure 10, the locking tongue is centrally arranged within the support arm.

[00138] As shown in Figures 1 and 3, a cover member 18 is slidably engaged on the rails at each end of the mullion and transoms. That is, each secondary frame member has two slide cover members 18.

[00139] Referring to Figures 13 to 15, each cover member 18 includes a cover plate 19 and a pair of side edge legs 20 extending from the cover plate. Each side edge leg has an external profile which is of complementary configuration to the inner profile of the wall and lip portions of the rail of the mullion/transom. This complementary inner profile is such that the cover member 18 can be slidably received within the mullion or transom. Each side edge leg 20 has an internal profile which is of complementary configuration to the external profile of the side edge ribs 15 of the support arm 12 of the mounting bracket 10. Each side edge leg has an S-shaped stepped configuration.

[00140] Each cover plate 19 has a receiving formation in the form of a centrally located through hole 21 for receiving the half-sphere locking member 17 on the locking tongue 16 of the mounting bracket 10 to secure the mullion 4 or transom 5 to the respective mounting bracket 10. The locking member 17 is received within the hole 21 in a secure snap-locking manner.

[00141] It will be appreciated that the through hole 21 enables access to the locking member 17, via the hole 21, so that the locking member 17 can be pushed out from the through hole, against the action of the biased locking tongue 16. With the locking member 17 pushed out from the hole 21, the cover member 18 can be slid away from the mounting bracket 10 to dismount the mullion 4 or transom 5, as and when required. A small hand-held implement may be inserted through the hole 21 to release the locking member from the hole.

[00142] The complementary edge profiles of the mullion/transom rails, the slide covers, and the mounting brackets, in combination with the snap-locking engagement between the locking member and slide cover, provides a solidly interconnected joint assembly at each mullion/sub-frame junction and each transom/sub-frame junction. It will therefore be appreciated that the joint assembly provides a simple, efficient and structurally sound interconnected frame, formed by the primary and secondary frame structures, yet is readily able to be disassembled for cleaning, maintenance or other duties.

[00143] In the illustrated embodiment, the distal end of each transom 5 is connected to the mounting brackets 10 on the respective sub-frame members 3 as described above. A connecting bracket 22 is provided to facilitate mounting of the proximal ends of the transoms 5 to the mullion 3, as shown in Figures 1 and 4. The connecting bracket 22 slidably engages with the mullion 3.

[00144] Referring to Figures 16 to 21, the connecting bracket 22 has a body portion 23 in which is defined a connecting formation in the form of slots 24 which are complementary in shape to that of the rails 8 to provide secure close fitting engagement onto the mullion 4.

[00145] The body portion 23 includes two securing through holes 29, each configured to receive a fastener in the form of a screw (not shown), for securing the connecting bracket 22 in a desired position along the length of the mullion 4.

[00146] Each connecting bracket 22 has a connecting arm 25 projecting outwardly from each side of the body portion 23. Each connecting arm 25 is configured to support the proximal end of the respective transom. Each connecting arm 25 is configured to be received within the channel at the proximal end of the respective transom.

[00147] As best seen in Figures 16 and 20, each connecting arm 25 has a locking element in the form of a self-biased locking tongue 26. The locking tongue 26 is configured to be cantilevered, whereby the free end of the locking tongue is biased to its locking position by the resilience of the material from which the connecting bracket is formed. As seen in Figure 20, each locking tongue 26 is centrally arranged within the connecting arm. The distal end of the locking tongue 26 has a locking member in the form of a half-sphere 27 projecting upwardly from the locking tongue.

[00148] Each connecting arm 25 is sized to have a width which enables it to be received within the open region of the channel at the proximal end of the respective transom 5. As best seen in Figure 16, the side edges of the connecting arm 25 are notched to define side edge ribs 28 having an external profile.

[00149] A cover member 18, as described above, is also associated with the proximal end of each transom 5. Again, the cover member is slidably engaged with the rails of the transom and includes a cover plate and a pair of side edge legs extending from the cover plate. Each side edge leg has an external profile which is of complementary configuration to the inner profile of the rail and lip of the transom such that the cover member can be slidably received within the transom. Each side edge leg has an internal profile which is of complementary configuration to the external profile of the side edge ribs of the connecting arm 25 of the connecting bracket 22.

[00150] The cover plate has a receiving formation in the form of a through hole for receiving the locking member of the connecting arm to secure the transom thereto, in a similar manner as decribed above in relation to the connection with the sub-frame members. Again, the through hole facilitates releasing the locking member from the through hole, against the action of the biased locking element, to enable the cover member to be slid away from the connecting arm to dismount the transom, as and when required.

[00151] In the illustrated embodiment, four glazing panels will be releasably mounted to the frame assembly formed of the primary frame structure and the secondary frame structure. Each glazing panel is formed from glazing frame members, including, top, bottom and side members. Each glazing frame member has a receiving formation for receiving a corresponding edge of a glazing pane. The receiving formation is generally U-shaped and adapted to provide a snug or close-fit for the corresponding edge of the glazing pane. The glazing pane is made from a thermoplastic material, such as an acrylic or polycarbonate.

[00152] Each glazing panel has a handle for facilitating mounting to and removal from the primary and secondary frame structure, as desired. The handle includes a first handle portion located on a first side sub-frame member and a second handle portion located on the opposed second side sub-frame member, allowing the glazing panel to be handled with two hands.

[00153] A magnetic mounting means is provided for releasably mounting each glazing panel to the primary and secondary frame structure assembly (e.g. sub-frame, mullion, and transoms). The mounting means includes a first magnetic element associated with the primary and secondary frame structure and a second magnetic element associated with each glazing panel, the first and second magnetic elements acting in combination to enable releasable mounting of the respective glazing panel to the primary and secondary frame structure assembly.

[00154] The first magnetic element includes a thin elongate steel strip mounted in face-to-face relationship to an inner face of each sub-frame member to create a continuous magnetic surface around the inner face of the sub-frame. Magnetic strips are also applied to the base web of the mullion and transoms, these strips being applied either side of the stiffening rib. In the illustrated embodiment, the stiffening ribs effectively divide the magnetic strips into four distinct rectangular magnetic tracks, one for each of the four glazing panels. The magnetic strips may be adhered to the inner face of the associated sub-frame element and base webs by, for example, double-sided bonding tape.

[00155] The second magnetic element, mounted on each glazing panel, has a mating surface adapted to abut against the first magnetic element in face-to-face magnetic sealing engagement. The second magnetic element is an elongate strip formed of a magnetic material, the magnetic strip being mounted to an inner face of the glazing panel frame. Each glazing panel frame member has a mounting formation (e.g. channel, groove, etc) in which the second magnet element is received (e.g. securely embedded or otherwise housed). A second magnetic element is mounted to each glazing panel frame member to create a continuous magnetic surface around the inner face of the glazing panel such a continuous sealing engagement with the respective first magnetic element track is possible.

[00156] Accordingly, the present invention, at least in its preferred embodiments, provides a simple and effective auxiliary framing system which is able to be readily retrofitted to a building structure such as door, window or skylight, to enable a second glazing layer to be releasably mounted on the inside of the existing structure. The ability to remove the mullion 4 and transoms 5 provides a range of performance improvements over previously known double glazing systems, including providing substantially unobstructed access to the existing window pane for cleaning or maintenance activities, as required. In addition, the manner in which the mullions and transoms are interconnected to one another and to the sub-frame advantageously provides a simple, efficient and common solution for use with many different existing window designs. The interconnection of components is particularly robust and offers high structural integrity. In these and other respects, the invention in its preferred embodiments, represents a practical and commercially significant improvement over the prior art.

[00157] Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms.

Claims (23)

1. An auxiliary framing system for an opening in a building structure, the system including: a primary frame structure mountable to the building structure, the primary frame structure being configured to extend generally about the opening; and a secondary frame structure releasably mountable to the primary frame structure, such that the secondary frame structure divides an open area of the primary frame structure into at least a first open portion and a second open portion.

2. An auxiliary framing system according to claim 1, wherein the primary frame structure includes a plurality of sub-frame members.

3. An auxiliary framing system according to claim 2, wherein the primary frame structure includes four sub-frame members, including a top member, a bottom member and two side members.

4. An auxiliary framing system according to any one of the preceding claims, wherein the primary frame structure is configured to form an uninterrupted mating surface extending about the opening and against which a portion of a glazing panel can be mounted.

5. An auxiliary framing system according to any one of the preceding claims, wherein the secondary frame structure includes at least one secondary frame member.

6. An auxiliary framing system according to claim 5, wherein the secondary frame structure includes two or more secondary frame members, thereby to divide the open area of the primary frame structure into three or more open options.

7. An auxiliary framing system according to claim 6, wherein each open portion is square or rectangular in profile.

8. An auxiliary framing system according to any one of the preceding claims, wherein the secondary frame structure includes at least one mullion mountable to the primary frame structure so as to extend across the open area of the primary frame structure.

9. An auxiliary framing system according to claim 8, wherein the secondary frame structure includes at least one transom extending from the mullion to at least one side of the primary frame structure.

10. An auxiliary framing system according to any one of claims 1 to 7, wherein the secondary frame structure includes a transom mountable to the primary frame structure and extending across the open area of the primary frame structure.

11. An auxiliary framing system according to claim 10, wherein the secondary frame structure includes at least one mullion extending from the transom to at least one side of the primary frame structure.

12. An auxiliary framing system according to any one of claims 8 to 11, wherein each mullion and transom includes an elongate element having a substantially constant cross-sectional profile along its length.

13. An auxiliary framing system according to claim 12, wherein each elongate element includes a channel.

14. An auxiliary framing system according to any one of claims 8 to 13, wherein each mullion and transom includes a stiffening element extending longitudinally along its length.

15. An auxiliary framing system according to claim 14, wherein the stiffening element is longer than a base web of the elongate element such that the stiffening element extends past the respective ends of the base web, so as to at least partially overlap and engage the primary frame structure and thereby in use locate the respective mullion and transom relative to the primary frame structure.

16. An auxiliary framing system according to any one of claims 8 to 15, including at least one mounting bracket attachable to the primary frame structure and adapted to facilitate mounting of the secondary frame structure to the primary frame structure.

17. An auxiliary framing system according to claim 16, wherein the mounting bracket is generally L-shaped and includes a base for engaging the primary frame structure and a support arm extending orthogonally from the base, the support arm being configured to support an end of the respective mullions and transoms of the secondary frame structure.

18. An auxiliary framing system according to claim 16 or claim 17, wherein the mounting bracket includes a locking element.

19. An auxiliary framing system according to claim 18 wherein a cover member is associated with each end of the mullions and transoms, and wherein the cover member has a receiving formation for receiving the locking element of the mounting bracket to secure the mullion or transom to the mounting bracket.

20. An auxiliary framing system according to any one of the preceding claims, including two or more glazing panels and a mounting means for releasably mounting each glazing panel to the primary and secondary frame structures.

21. An auxiliary framing system according to claim 20, wherein the mounting means includes a first magnetic element associated with the primary and secondary frame structure and a second magnetic element associated with each glazing panel, the first and second magnetic elements acting in combination to enable releasable mounting of the respective glazing panel to the primary and secondary frame structure assembly.

22. An auxiliary framing system according to claim 20 or claim 21 wherein the mounting means is configured such that each glazing panel is mountable in continuous sealing engagement with a predetermined portion of the primary frame structure and the secondary frame structure.

23. An auxiliary framing system according to any one of the preceding claims wherein the mounted glazing panels are spaced a predetermined distance from pane within the opening in the building structure, thereby to create an insulating air cavity therebetween.