Technical field

[0001] The present invention relates to window assemblies, particularly louvre window assemblies.

Background to the invention

[0002] The following discussion of the prior art is intended to place the invention in an appropriate technical context and enable its advantages to be more fully appreciated. However, any references to prior art throughout this specification should not be construed as an express or implied admission that such art is widely known or is common general knowledge in the relevant field.

[0003] A louvre is an external window assembly with horizontal slats that are angled to admit light and air, but to keep out rain, direct sunshine, and noise. The angle of the slats may be adjustable. Louvre blades can be made of a variety of materials including, for example, glass, timber or aluminium. Accordingly, in addition to the functional aspects associated with admitting light and air, the style of louvre windows can form part of a room design or building concept.

[0004] Louvre windows are now used extensively in many buildings due to their ability to be open but still provide security. When opened, the louvres allow airflow through the building structure for thermal management.

[0005] Further, although numerous solutions have been posed in the past to varying levels of success, sealing a louvre window is quite often problematic. Accordingly, there remains a need to enhance the thermal performance of louvre window assemblies.

[0006] Louvre windows consist of a surround frame formed of upper and lower horizontal frame portions and opposed side frame portions which are fastened together. The frame supports an array of horizontal louvres which pivot about horizontal pivot pins between louvre open and louvre closed positions. It is known to tip the frame on its side such that the louvres extend vertically, however the invention will be described with respect to horizontally extending louvre blades. [0007] For louvre windows, the blades are typically formed of glass (but can be made of other material) and are rectangular when viewed in plan.

[0008] In order to reduce water penetration through the louvre window, the blades are in an overlapping configuration when closed, which means that a lower longitudinal edge of an upper blade overlaps the upper longitudinal edge of an adjacent lower blade. It is also known to have end clips configured to seal against each other to minimise water penetration through the end clips. The configuration of the end clip includes a longitudinal rib which seals against the U-shaped aluminium channel as the end clip pivots from the open position to the closed position.

[0009] Overlapping blades are not very effective in preventing water penetration. Under strong wind and rain conditions, water can be forced uphill between the overlapping closed blades and into the interior of the louvre window. One way to minimise this is to increase the degree of overlap, but this increases the size and weight of a louvre window and reduces optical transparency.

[0010] However, to date such systems have been prone to significant disadvantages or shortcomings including in relation to undesired water ingress and relatively low thermal performance.

[0011] It is an object of the present invention to overcome or ameliorate one or more disadvantages of the prior art, or at least to provide a useful alternative.

Summary of the invention

[0012] According to one aspect of the invention, there is provided a window assembly, including: a frame; and a plurality of insulated glazing units pivotally mounted to the frame; each insulated glazing unit being pivotal between an open position in which an airway is provided between adjacent insulated glazing units, and a closed position in which adjacent insulated glazing units are in sealing engagement with each other.

[0013] In some embodiments, the frame includes a head, a sill and a pair of side jambs. Preferably, the frame has an open area of a predetermined size, wherein the open area is bounded or defined by the head, sill and side jambs. In some embodiments, the open area of the frame is rectangular or square.

[0014] In some embodiments, the plurality of insulated glazing units is arranged to form a vertical array of insulated glazing units. In some embodiments, the plurality of insulated glazing units is arranged in a stacked vertical array, with the individual insulated glazing units stacked one on top of the other. In some embodiments, the plurality of insulated glazing units is arranged such that, when the insulated glazing units are in the closed position, the insulated glazing units are in vertical alignment. In some embodiments, the plurality of insulated glazing units is arranged such that, when the insulated glazing units are in the closed position, an exterior surface of each of the insulated glazing units is (vertically) aligned or flush with a corresponding exterior surface of an adjacent insulated glazing unit.

[0015] Preferably, the exterior surface of all the insulated glazing units are (vertically) aligned when in the closed position, thereby to provide a flush and relatively flat or smooth combined exterior surface of the array of insulated glazing units. The flush and relatively flat or smooth combined exterior surface of the array of insulated glazing units, when the glazing units are in the closed position, advantageously provides for a desired visual aesthetic to the window assembly.

[0016] In some embodiments, each insulated glazing unit has one or more glazing panels or panes or blades. Preferably, each insulated glazing unit has two or more glazing panels (or panes or blades), wherein the two or more glazing panels are arranged in parallel spaced apart relationship. Preferably, the distance between adjacent surfaces of a pair of spaced apart glazing panels is a predetermined fixed distance. In some embodiments, each glazing panel may have a thickness between 4mm and 20mm. For example, in certain embodiments, each glazing panel may have a thickness of approximately 5mm. In some embodiments, the thickness of the interior glazing panel is the same as the thickness of the exterior glazing panel. In some embodiments, the thickness of the interior glazing panel is different compared to the thickness of the exterior glazing panel. In some embodiments, the thickness of the interior glazing panel is greater than the thickness of the exterior glazing panel. In some embodiments, the thickness of the interior glazing panel is less than the thickness of the exterior glazing panel.

[0017] In some embodiments, the distance between adjacent inner surfaces of a pair of spaced apart glazing panels is in the range of 5 mm to 40 mm. For example, in certain embodiments, the distance between adjacent inner surfaces of a pair of spaced apart glazing panels is approximately 12 mm.

[0018] In some embodiments, the distance between opposed outer surfaces of a pair of spaced apart glazing panels is in the range of 15 mm to 50 mm. In some embodiments, the distance between opposed outer surfaces of a pair of spaced apart glazing panels is in the range of 20 mm to 30 mm. For example, in certain embodiments, the distance between outer surfaces of a pair of spaced apart glazing panels is approximately 22 mm. It will be appreciated that the distance between outer surfaces of a pair of spaced apart glazing panels can be determined and selected to suit the insulating requirements of a particular application, including to account for the anticipated environmental conditions for that application. The spacing between the or each pair of glazing panel enables an insulating air or gas pocket to be formed therebetween. In some embodiment, gas pocket may contain or be filled with an insulating gas, thereby to reduce heat transfer through the insulated glazing panel and thus enhance the insulating characteristics or properties of the insulated glazing panel, and increases the overall thermal performance of the window assembly. Preferably, the insulating gas has a density greater than air. In some embodiments, the insulating gas is Argon.

[0019] In some embodiments, one or more of the glazing panels may have an insulating coating applied thereto, thereby to reduce the transfer of heat through the glazing panel and thus enhance the insulating properties of the glazing panel and the insulated glazing unit as a whole. Preferably, the coating is a low emissivity coating. In some embodiments, the insulating coating may be applied to one side of at least one of the glazing panels. In some embodiments, the insulating coating may be applied to an exterior facing side of at least one of the glazing panels. In some embodiments, the insulating coating may be applied to at least the exterior facing side of the exterior glazing panel. In some embodiments, the insulating coating may be applied to both sides of at least one of the glazing panels.

[0020] In some embodiments, each insulated glazing unit has two glazing panels. The two glazing panels are preferably arranged, in use, to form an interior glazing panel and an exterior glazing panel. In some embodiments, the two insulated glazing panels of each insulated glazing unit are in parallel spaced apart relationship such that, when the glazing units are in the closed position, the interior glazing panel of all the glazing units are (vertically) aligned or stacked, and the exterior glazing panel of all the glazing units are (vertically) aligned or stacked. The vertical alignment of the exterior panels advantageously provides a flush and streamline exterior visual aesthetic to the window assembly when it is closed. [0021] In some embodiments, each glazing panel (or pane or blade) is generally rectangular or square in shape. In some embodiments, each glazing panel (or pane or blade) can be formed of a transparent, translucent or opaque material. Preferably, each glazing panel (or pane or blade) is made from glass. However, it will be appreciated that the glazing panels can be formed of other materials such as, for example, plastic or timber.

[0022] In some embodiments, the interior glazing panel is made of the same material from that which the exterior glazing panel is made. In some embodiments, the interior glazing panel is made of a different material from that which the exterior glazing panel is made.

[0023] In some embodiments, the interior glazing panel of each of the plurality of insulated glazing units is made of the same material. In some embodiments, the exterior glazing panel of each of the plurality of insulated glazing units is made of the same material.

[0024] In some embodiments, the interior glazing panel of some of the plurality of insulated glazing units is made of a different material to that from which the interior panel of the other of the plurality of insulated glazing units is made. In some embodiments, the exterior glazing panel of some of the plurality of insulated glazing units is made of a different material to that from which the exterior panel of the other of the plurality of insulated glazing units is made.

[0025] In some embodiments, the length of the interior glazing panel is greater than the length of the exterior glazing panel. In some embodiments, the length of the exterior glazing panel is greater than the length of the interior glazing panel. In some embodiments, the length of the interior glazing panel is substantially the same as the length of the exterior glazing panel.

[0026] In some embodiments, the width (or height) of the interior glazing panel is substantially the same as the width (or height) of the exterior glazing panel.

[0027] Preferably, the thickness of the interior glazing panel is substantially the same as the thickness of the exterior glazing panel. In some embodiments, the thickness of the interior glazing panel is greater than the thickness of the exterior glazing panel. In some embodiments, the thickness of the exterior glazing panel is greater than the thickness of the interior glazing panel.

[0028] In some embodiments, the two glazing panels are held in parallel spaced apart relationship by a spacer arranged intermediate or otherwise between the two glazing panels. In some embodiments, the spacer is elongate. In some embodiments, the spacer is dual layered. In some embodiments, the dual layered spacer has a first (inner) layer formed of a first material, and a second (outer) layer formed of a second material. In some embodiments, the first (inner) layer is formed of an insulating material. In some embodiments, the second (outer) layer acts as a seal. In some embodiments, the second (outer) layer is formed of Urethane. In some embodiments, the spacer has a constant cross-sectional profile such as, for example, a substantially square or rectangular cross-sectional profile. In some embodiments, the spacer is arranged along the inner edges of the inner surface of the interior glazing panel. In some embodiments, the spacer is arranged along the inner edges of the inner surface of the interior and exterior glazing panel. Preferably, the spacer extends continuously around the periphery of the inner surface of the interior glazing panel. In some embodiments, the spacer may be formed of (four) discrete individual elongate spacer members, which are arranged along respective inner edges of the interior glazing panel. In some embodiments, the spacer may be formed as a one-piece spacer member, which complements the (rectangular or square) shape and size of the interior glazing panel such that it can extend continuously around the periphery of the inner edges of the interior glazing panel. By surrounding or bordering the periphery of the inner edges of the interior glazing panel, the spacer advantageously leaves a substantially open area within the middle of the glazing panel and the unit itself such that it only offers a limited visual obstruction to light and observation through the insulated glazing unit.

[0029] In some embodiments, the horizontal elements or portions of the spacer extend along the inner longitudinal (upper and lower) edges of the exterior glazing panel. In some embodiments, where the length of the interior glazing panel is greater than the length of the exterior glazing panel, the vertical elements or portions of the spacer are positioned inwardly from the respective vertical inner (left and right) side edges of the exterior glazing panel. In such embodiments, a left end portion of the interior glazing panel projects outwardly (i.e. to the left) from the left edge of the spacer and the corresponding left edge of the exterior glazing panel. In such embodiments, a right end portion of the interior glazing panel projects outwardly (i.e. to the right) from the right edge of the spacer and the corresponding right edge of the exterior glazing panel. Preferably, a central (vertical) axis of the interior glazing panel is aligned with the central (vertical) axis of the exterior glazing panel such that the extent to which the left end portion of the interior glazing panel projects outwardly from the left edge of the spacer (and exterior glazing panel) is the same as the extent to which the right end portion of the interior glazing panel projects outwardly from the right end portion of the spacer (and exterior glazing panel). [0030] In some embodiments, the interior and exterior glazing panels are secured to the spacer element with an adhesive, the adhesive being applied to the respective interior and exterior faces of the spacer which contact the respective inner faces of the interior and exterior glazing panels in mating face-to face abutment.

[0031] In some embodiments, each insulated glazing unit is frameless. In this context, the term “frameless” is intended to mean that each insulated glazing unit does not have a frame formed of a rigid metal such as a metal (e.g. aluminium) surrounding the glazing panels of the unit.

[0032] In some embodiments, each insulated glazing unit has an upper sealing element, thereby to form a seal with the lower edge or lower edge region of the adjacent glazing unit when in the closed position. In some embodiments, each insulated glazing unit has a lower sealing element, thereby to form a seal with the upper edge or upper edge region of the adjacent glazing unit when in the closed position.

[0033] In some embodiments, each insulated glazing unit has an upper sealing element and a lower sealing element. Preferably, when the plurality of insulated glazing units is in the closed position, the lower sealing element of a first insulated glazing unit is in sealing engagement with the upper sealing element of an adjacent, second insulated glazing unit.

[0034] This sealing engagement between the lower sealing element of a first insulated glazing unit and the upper sealing element of an adjacent, second insulated glazing unit advantageously ensures that there is no panel-on-panel contact between adjacent insulated glazing units. That is, adjacent edges of the glazing panels do not overlap with each other, or otherwise contact each other. Rather, this arrangement advantageously ensures that there is a direct seal-on-seal engagement between the respective upper and lower sealing elements, which enhances the protection against undesired ingress of rainwater and wind, and provides improved thermal performance to the plurality of insulated glazing units and the window assembly as a whole. In addition, the adjacent edges of the glazing panels are (vertically) spaced apart, which allows the upper and lower glazing panels to be brought into direct overhead, vertical alignment with other, thereby providing a flush exterior visual aesthetic. The upper and lower insulating elements preferably have complementary configurations, thereby to facilitate the vertical alignment of the glazing panels in the closed position.

[0035] In some embodiments, the lower sealing element is mounted to, or adjacent to, the operatively lower or bottom edge of the glazing panel or panels of the respective insulated glazing unit. In some embodiments, the lower sealing element is generally L-shaped. In some embodiments, the generally L-shaped lower sealing element has a first arm configured to facilitate mounting of the lower sealing element to, or adjacent to, the lower or bottom edge of the insulated glazing unit, and a second arm extending orthogonally (downwardly, in use) from the first arm, wherein at least a portion (e.g. towards the distal end) of the second arm matingly engages (e.g. in face-to-face abutment) the upper sealing element associated with the adjacent insulated glazing unit. In some embodiments, the distal end of the second arm of the lower sealing element overlaps the upper edge of the exterior glazing panel of the adjacent (lower) insulated glazing unit.

[0036] In some embodiments, the lower sealing element has an attachment formation associated with its first arm, the attachment formation being configured to facilitate attachment to, or adjacent to, the lower or bottom edge of the respective insulated glazing unit. In some embodiments, the attachment formation includes one or more projections extending from a rear surface of the first arm of the lower sealing element, the one or more projections being configured to facilitate attachment to, or adjacent to, the lower or bottom edge of the respective insulated glazing unit. In some embodiments, the first arm has a pair of projections extending from its rear surface. In some embodiments, each projection extends continuously along the length of the first arm. In some embodiments, each projection may have an interrupted profile (i.e. with discrete portions) extending along the length of the first arm. In some embodiments, each projection may have a hook-type cross-sectional profile such as, for example, curved, bent or otherwise include an angle portion, thereby to facilitate the engagement or attachment to the glazing unit. In some embodiments, the lower or bottom edge of the insulated glazing unit includes a complementary groove, slot or track for receiving the respective projection, thereby to attach the lower sealing element to the insulated glazing unit. In some embodiments, the projection securely engages the lower spacer member of the glazing unit, thereby to secure the lower sealing element to the lower edge of the glazing unit. In some embodiments, the projection (e.g. pair of hook-type projections) is embedded within the lower spacer member of the glazing unit, thereby to secure the lower sealing element to the lower edge of the glazing unit. In some embodiments, the attachment formation or projection (e.g. pair of hook-type projections) is embedded within the second (outer) layer of the spacer.

[0037] In some embodiments, the second arm of the lower sealing element includes a seal extension, the seal extension extending inwardly from an operatively inner surface of the second arm, thereby to increase the size of the sealing surface that matingly engages the upper sealing element of the adjacent insulated glazing unit. In some embodiments, the seal extension extends at an angle relative to the second arm of the lower sealing element. In some embodiments, the angle at which the seal extension extends relative to the second arm of the lower sealing element is such that the seal extension is upwardly inclined, in use.

[0038] In some embodiments, the first arm of the lower sealing element includes a seal fin, the seal fin extending from a distal (free) end of the first arm, thereby to provide an engagement surface against which the upper sealing element of the adjacent (lower) glazing unit can engage when the glazing units are in the closed position. In some embodiments, the seal fin extends downwardly, in use. In some embodiments, the seal fin is resiliently flexible, whereby the seal fin moves or flexes inwardly (i.e. towards an interior of the glazing unit) when glazing units are in the closed position and the seal fin is in sealing engagement with the upper sealing element of the adjacent (lower) glazing unit. In some embodiments, the seal fin extends continuously along the length of the first arm. In some embodiments, the seal fin may have an interrupted profile (i.e. with discrete portions) extending along the length of the first arm.

[0039] In some embodiment the first arm of the lower sealing member includes a stiffening element or formation. In some embodiments, the stiffening element is arranged at about the midpoint of the first arm. In some embodiments, the stiffening element is arranged so as to be located about the midpoint between a pair of glazing panels of the insulated glazing unit. In some embodiments, the stiffening element has a generally curved cross-sectional profile. In some embodiments, the cross-sectional profile of the stiffening element corresponds to a sector of an annulus such as, for example, three-quarters or two-thirds of an annulus. In some embodiments, the stiffening element has an opening or open side. In some embodiments, the opening or open side faces toward the interior of the respective glazing unit. In some embodiments, the stiffening element may be at least partially embedded in the lower spacer member of the respective glazing unit. In some embodiments, the stiffening formation is at least partially embedded within the second (outer) layer of the spacer. In some embodiments, the stiffening element extends continuously along the length of the first arm. In some embodiments, the stiffening element may have an interrupted profile (i.e. with discrete portions) extending along the length of the first arm.

[0040] In some embodiments, the upper sealing element is mounted to, or adjacent to, the operatively upper or top edge of the glazing panel or panels of the respective insulated glazing unit. In some embodiments, the upper sealing element is generally L-shaped. In some embodiments, the generally L-shaped upper sealing element has a first arm configured to facilitate mounting of the upper sealing element to, or adjacent to, the upper or top edge of the insulated glazing unit, and a second arm extending orthogonally (upwardly, in use) from the first arm, wherein at least a portion (e.g. towards the distal end) of the second arm matingly engages (e.g. in face-to-face abutment) the lower sealing element associated with the adjacent insulated glazing unit. In some embodiments, the distal end of the second arm of the upper sealing element overlaps the lower edge of the interior glazing panel of the adjacent (upper) insulated glazing unit.

[0041] In some embodiments, the upper sealing element has an attachment formation associated with its first arm, the attachment formation being configured to facilitate attachment to, or adjacent to, the upper or top edge of the respective insulated glazing unit. In some embodiments, the attachment formation includes one or more projections extending from a rear surface of the first arm of the upper sealing element, the one or more projections being configured to facilitate attachment to, or adjacent to, the upper or top edge of the respective insulated glazing unit. In some embodiments, the first arm has a pair of projections extending from its rear surface. In some embodiments, each projection extends continuously along the length of the first arm. In some embodiments, each projection may have an interrupted profile (i.e. with discrete portions) extending along the length of the first arm. In some embodiments, each projection may have a hook-type cross-sectional profile such as, for example, curved, bent or otherwise include an angle portion, thereby to facilitate the engagement or attachment to the glazing unit. In some embodiments, the upper or top edge of the insulated glazing unit includes a complementary groove, slot or track for receiving the respective projection, thereby to attach the upper sealing element to the insulated glazing unit. In some embodiments, the projection securely engages the upper spacer member of the glazing unit, thereby to secure the upper sealing element to the upper edge of the glazing unit. In some embodiments, the projection (e.g. pair of hook-type projections) is embedded within the upper spacer member of the glazing unit, thereby to secure the upper sealing element to the upper edge of the glazing unit. In some embodiments, the attachment formation or projection (e.g. pair of hook-type projections) is embedded within the second (outer) layer of the spacer.

[0042] In some embodiments, the second arm of the upper sealing element includes a seal extension, the seal extension extending inwardly from an operatively inner surface of the second arm, thereby to increase the size of the sealing surface that matingly engages the lower sealing element of the adjacent insulated glazing unit. In some embodiments, the seal extension extends at an angle relative to the second arm of the lower sealing element. In some embodiments, the angle at which the seal extension extends relative to the second arm of the lower sealing element is such that the seal extension is downwardly inclined, in use.

[0043] In some embodiments, the first arm of the upper sealing element includes a seal fin, the seal fin extending from a distal (free) end of the first arm, thereby to provide an engagement surface against which the lower sealing element of the adjacent (upper) glazing unit can engage when the glazing units are in the closed position. In some embodiments, the seal fin extends upwardly, in use. In some embodiments, the seal fin is resiliently flexible, whereby the seal fin moves or flexes inwardly (i.e. towards an interior of the glazing unit) when glazing units are in the closed position and the seal fin is in sealing engagement with the lower sealing element of the adjacent (upper) glazing unit. In some embodiments, the seal fin extends continuously along the length of the first arm. In some embodiments, the seal fin may have an interrupted profile (i.e. with discrete portions) extending along the length of the first arm.

[0044] In some embodiment the first arm of the upper sealing member includes a stiffening element or formation. In some embodiments, the stiffening element is arranged at about the midpoint of the first arm. In some embodiments, the stiffening element is arranged so as to be located about the midpoint between a pair of glazing panels of the insulated glazing unit. In some embodiments, the stiffening element has a generally curved cross-sectional profile. In some embodiments, the cross-sectional profile of the stiffening element corresponds to a sector of an annulus such as, for example, three-quarters or two-thirds of an annulus. In some embodiments, the stiffening element has an opening or open side. In some embodiments, the opening or open side faces toward the interior of the respective glazing unit. In some embodiments, the stiffening element may be at least partially embedded in the upper spacer member of the respective glazing unit. In some embodiments, the stiffening member is embedded within the second (outer) layer of the spacer. In some embodiments, the stiffening element extends continuously along the length of the first arm. In some embodiments, the stiffening element may have an interrupted profile (i.e. with discrete portions) extending along the length of the first arm.

[0045] In some embodiments, a top or head seal is mounted to, or adjacent to, the head or adjacent top member of the frame. Preferably, the head seal is adapted to sealingly engage the upper sealing element of the uppermost insulated glazing unit of the plurality of insulated glazing units. In some embodiments, the head seal is generally L-shaped. In some embodiments, the generally L-shaped head seal has a first arm configured to facilitate mounting to or adjacent to the head of the frame, and a second arm extending orthogonally (downwardly, in use) from the first arm, wherein at least a portion (e.g. towards the distal end) of the second arm matingly engages (e.g. in face-to-face abutment) the upper sealing element associated with the uppermost insulated glazing unit. In some embodiments, the distal end of the second arm overlaps the upper edge of the exterior glazing panel of the uppermost insulated glazing unit.

[0046] In some embodiments, the top or head seal has an attachment formation associated with its first arm, the attachment formation being configured to facilitate attachment to, or adjacent to, the head of the frame. In some embodiments, the attachment formation includes one or more projections extending from a rear surface of the first arm of the head seal, the one or more projections being configured to facilitate attachment to, or adjacent to, the head of the frame. In some embodiments, the first arm has a pair of projections extending from its rear surface. In some embodiments, each projection extends continuously along the length of the first arm. In some embodiments, each projection may have an interrupted profile (i.e. with discrete portions) extending along the length of the first arm. In some embodiments, each projection may have a hook-type cross-sectional profile such as, for example, curved, bent or otherwise include an angle portion, thereby to facilitate the engagement or attachment to the head frame member. In some embodiments, the head frame member, or adjacent member, to which the top or head seal is attached includes a complementary groove, slot or track for receiving the respective projection, thereby to attach the head seal to the frame. In some embodiments, the head seal is releasably attachable to the frame.

[0047] In some embodiments, the top or head seal is attached to, or adjacent to, the head of the frame with one or more fasteners such as, for example, mechanical fasteners including but not limited to screws, rivets, nails, staples and the like. In some embodiments, an adhesive may be used to secure the head seal to the head, either alone or in combination with one or more mechanical fasteners.

[0048] In some embodiments, a bottom or sill seal is mounted to, or adjacent to, the sill or adjacent bottom member of the frame. Preferably, the sill seal is adapted to sealingly engage the lower sealing element of the lowermost insulated glazing unit of the plurality of insulated glazing units. In some embodiments, the sill seal is generally L-shaped. In some embodiments, the generally L-shaped sill seal has a first arm configured to facilitate mounting to, or adjacent to, the sill of the frame, and a second arm extending orthogonally (upwardly, in use) from the first arm, wherein at least a portion (e.g. towards the distal end) of the second arm matingly engages (e.g. in face-to-face abutment) the lower sealing element associated with the lowermost insulated glazing unit. In some embodiments, the distal end of the second arm overlaps the lower edge of the interior glazing panel of the lowermost insulated glazing unit.

[0049] In some embodiments, the bottom or sill seal has an attachment formation associated with its first arm, the attachment formation being configured to facilitate attachment to, or adjacent to, the sill of the frame. In some embodiments, the attachment formation includes one or more projections extending from a rear surface of the first arm of the head seal, the one or more projections being configured to facilitate attachment to, or adjacent to, the sill of the frame. In some embodiments, the first arm has a pair of projections extending from its rear surface. In some embodiments, each projection extends continuously along the length of the first arm. In some embodiments, each projection may have an interrupted profile (i.e. with discrete portions) extending along the length of the first arm. In some embodiments, each projection may have a hook-type cross-sectional profile such as, for example, curved, bent or otherwise include an angle portion, thereby to facilitate the engagement or attachment to the sill frame member. In some embodiments, the sill frame member, or adjacent member, to which the bottom or sill seal is attached includes a complementary groove, slot or track for receiving the respective projection, thereby to attach the sill seal to the frame. In some embodiments, the sill seal is releasably attachable to the frame.

[0050] In some embodiments, the bottom or sill seal is attached to, or adjacent to, the sill of the frame with one or more fasteners such as, for example, mechanical fasteners including but not limited to screws, rivets, nails, staples and the like. In some embodiments, an adhesive may be used to secure the head seal to the head, either alone or in combination with one or more mechanical fasteners.

[0051] In some embodiments, each insulated glazing panel is mounted between a pair of end clips or mounts. Preferably, each end clip is pivotally mounted to a respective side jamb of the frame, thereby to facilitate pivotal movement of the respective insulated glazing panel between its closed and open positions. In some embodiments, each clip has a flat front or exterior surface, which is aligned or flush with the exterior surface of the exterior glazing panel of the insulated glazing unit, in use.

[0052] In some embodiments, each end clip has a rear or interior cover. In some embodiments, the cover is cantilevered from the receiving formation. In some embodiments, the cover has a side edge, which is configured to be aligned with the respective side jamb member of the frame. In some embodiments, the side edge is a free (distal) edge of the cover. In some embodiments, the cover has a flat or planar rear or interior facing surface. In some embodiments, the cover has a curved rear or interior facing surface. In some embodiments, the cover extends from a location at, or adjacent to, the opening of the receiving formation. In some embodiments, the cover extends at an angle relative to the depth direction of the receiving formation. In some embodiments, the cover extends at an angle relative to the longitudinal axis of the insulating glazing unit or the interior glazing panel. In some embodiments, the cover is configured such that, in use, its side edge is aligned with the respective side jamb member. Preferably, the cover is configured such that, in use, its side edge is close-f ittingly aligned with the respective side jamb member.

[0053] In some embodiments, each end clip is adapted to be attached to a side edge of the insulated glazing panel. In some embodiments, each end clip has a receiving formation adapted to receive at least a portion of the respective side edge of the insulated glazing panel. In some embodiments, the receiving formation is adapted to receive at least a portion of the side edge portion of the interior glazing panel which projects outwardly of the exterior glazing panel (and the remainder of the glazing unit).

[0054] In some embodiments, each end clip is adapted to receive the entire side edge portion of the insulated glazing panel. In some embodiments, a height of each end clip is substantially the same as the height of the respective insulated glazing unit, particularly the height of the side edge portion to be received in the end clip. Preferably, a height of each end clip is greater than the height of the respective insulated glazing unit, particularly the height of the side edge portion to be received in the end clip. In some embodiments, the respective upper and lower ends of each end clip are configured to overlap with the respective lower and upper ends of the adjacent (upper or lower) end clips when the insulated glazing panels are in the closed position. For example, the lower end of each end clip may have a lip or tongue or other suitable stepped formation which is adapted to overlie or cover the upper end of the adjacent (lower) end clip, or vice versa. In some embodiments, the upper end of each end clip may have a recess or other region of reduced thickness having a complementary profile to the lip or tongue formation on the lower end of the clip, the recess or other region of reduced thickness being adapted to receive the lip or tongue type formation on the lower end of the adjacent (upper) end clip, or vice versa. The overlap between the respective upper and lower ends of adjacent end clips, when in the closed position, advantageously seals or otherwise acts as a barrier against water ingress between the ends of the end clips. In some embodiments, the overlapping arrangements described above may be formed on an operative exterior side of each end clip. In some embodiments, the overlapping arrangements described above may be formed on an operative interior side of each end clip. In some embodiments, there may be an overlapping arrangement as described above formed on both the operative interior and exterior sides of each end clip. In some embodiments, a height of the receiving formation of each end clip is substantially the same as the height of the respective insulated glazing unit, particularly the height of the side edge portion to be received in the end clip. In such embodiments, the end clips can be advantageously arranged in a vertical stack formation, when the insulated glazing units are in the closed position, and thereby form a (respective left and right) side edge border for the plurality of insulated glazing units.

[0055] In some embodiments, the side edge portion of the interior glazing panel to be received in the receiving formation of the end clip has a hole, the hole being configured to allow a retaining element (e.g. retaining pin) to be received therein, and thereby to secure the glazing unit to the end clip. Preferably, the retaining element extends in a direction perpendicular to the interior glazing panel. In some embodiments, each end clip has a passageway which is positioned such that the hole in the interior glazing panel can be aligned therewith, whereby the retaining element can be passed into the passageway and through the hole in the interior glazing element. Preferably, the passageway includes a pair of aligned through holes formed in sidewalls of the receiving formation of each end clip through which the retaining element passes. In some embodiments, each end clip has an abutment surface or stop arranged to define the end of the passageway, and thereby to limit the extent to which the retaining element can pass through the passageway such that it is seated within the hole of the interior glazing panel and thus holding the glazing unit securely in position relative to the end clip.

[0056] In some embodiments, a first brush seal is arranged between the end clip and a side jamb of the frame, thereby to form a seal against ingress of rainwater and wind. Preferably, a pair of first brush seals is provided, wherein one is arranged between a left side end clip and a left side jamb, and the other is arranged between a right side end clip and a right side jamb. In some embodiments, the first brush seal is elongate. In some embodiments, the first brush seal is formed of a resiliently deformable material. In some embodiments, the first brush seal is mounted to the end clip. In some embodiments, end clip has a first seal receiving formation such as, for example, a groove or track in which the first brush seal is securely mounted. In some embodiment, the first seal receiving formation is aligned with receiving formation for the insulated glazing unit. [0057] In some embodiments, a second brush seal is arranged between the end clip and the insulated glazing panel, thereby to inhibit water ingress between the glazing panels of the insulated glazing unit.

[0058] Preferably, a pair of second brush seals is provided, wherein one is arranged between a left side end clip and a left side of the insulated glazing panel, and the other is arranged between a right side end clip and a right side of the insulated glazing panel. In some embodiments, the second brush seal is elongate. In some embodiments, the second brush seal is formed of a resiliently deformable material. In some embodiments, the second brush seal is mounted to the end clip. In some embodiments, end clip has a second seal receiving formation such as, for example, a groove or track in which the second brush seal is securely mounted. In some embodiment, the second seal receiving formation is aligned with the exterior glazing panel, preferably an inner face of the exterior glazing panel of the insulated glazing unit.

[0059] In some embodiments, the plurality of insulated glazing units are each interconnected such that they move in unison. In some embodiments, a connecting rod or bar extends along at least one side of the glazing units, the connecting rod or bar being connected to each glazing unit by respective linkage elements, whereby a (vertical, upwards or downwards) movement of the connecting bar causes a corresponding movement of each of the glazing units such that they move in unison. For example, a downward movement of the connecting rod may cause each of the glazing units to move from the closed position towards the open position. Similarly, for example, an upward movement of the connecting rod may cause each of the glazing units to move from the open position towards the closed position. In some embodiments, the connecting rod can be positioned at one or more positions intermediate the extreme limits of movement of the connecting rod, thereby to enable selective positioning of the glazing panels at orientations between those associated with the fully open and closed positions. In some embodiments, an operating lever or handle is operatively connected to the connecting rod, whereby movement of the operating lever causes a corresponding movement of the connecting rod which in turns causes a corresponding movement of each of the connected glazing units.

[0060] In some embodiments, a motor or drive unit is operatively connected to the plurality of glazing unit, wherein operation of the motor or drive unit in a first direction causes each of the glazing units to move from the closed position towards the open position, and operation of the motor or drive unit in a second direction causes each of the glazing units to move from the open position towards the closed position.

[0061] According to another aspect of the invention, there is provided a louvre end clip for a window assembly substantially as described and illustrated herein.

[0062] According to another aspect of the invention, there is provided an insulated glazing unit for a window assembly substantially as described and illustrated herein.

[0063] According to another aspect of the invention, there is provided a louvre window assembly, including: a frame; and a plurality of louvre blades or panes pivotally mounted to the frame; each blade or pane having an upper (longitudinal) edge and a lower (longitudinal) edge; a first sealing element associated with the upper edge of each blade or pane; and a second sealing element associated with the lower edge of each blade or pane; wherein, each blade or pane is pivotally mounted to the frame for movement between an open position in which an airway is provided between adjacent blades or panes, and a closed position in which the lower sealing element of one blade or pane is in sealing engagement with the upper sealing element of an adjacent blade or pane.

Brief description of the drawings

[0064] A preferred embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings in which:

[0065] Figure 1 is a sectional top view of an embodiment of a window assembly having an array of selectively pivotal insulated glazing units, with each insulated glazing unit having a pair of glazing panels; and

[0066] Figure 2 is a sectional side view of the window assembly of Figure 1 , showing a pair of insulated glazing units in the closed position.

Preferred embodiment of the invention

[0067] Referring initially to Figure 1 , the invention provides a louvre window assembly 1. The window assembly includes a frame 2 and a plurality of insulated glazing units 3 pivotally mounted to the frame 2. Each insulated glazing unit 3 is pivotal between an open position in which an airway is provided between adjacent insulated glazing units 3, and a closed position, as shown in Figure 2, in which adjacent insulated glazing units 3 are in sealing engagement with each other.

[0068] The frame 2 includes a head 4, a sill 5 and a pair of side jambs 6. The frame 2 is arranged to define an open area of a predetermined size. The open area of the frame 2 is typically rectangular or square.

[0069] The plurality of insulated glazing units 3 is arranged to form a stacked vertical array of insulated glazing units 3, with the individual insulated glazing units stacked one on top of the other. As shown in Figure 2, the plurality of insulated glazing units 3 is arranged such that, when the insulated glazing units 3 are in the closed position, the insulated glazing units 3 are advantageously in direct vertical alignment with each other. The plurality of insulated glazing units 3 is arranged such that, when the insulated glazing units 3 are in the closed position, an exterior surface of each of the insulated glazing units 3 is vertically aligned or flush with a corresponding exterior surface of an adjacent insulated glazing unit 3 (i.e. the adjacent glazing unit 3 immediately above or below the respective glazing unit).

[0070] The exterior surface of all the insulated glazing units are vertically aligned when in the closed position, thereby to provide a flush and relatively flat or smooth combined exterior surface of the array of insulated glazing units. In this regard it will be appreciated that the number of insulated glazing units 3 is not limited to two glazing units as shown by way of example only in Figure 2. Rather, the window assembly may include two or more insulated glazing units 3. The number of glazing units 3 can be readily selected to suit a particular application such as, for example, to accommodate the height of window assembly for a particular building application.

[0071] The flush and relatively flat or smooth combined exterior surface of the array of insulated glazing units 3, which is provided when the glazing units are in the closed position, advantageously provides a desired visual aesthetic to the window assembly 1 .

[0072] Each insulated glazing unit 3 has one or more glazing panels or panes or blades (9, 10). In the illustrated embodiment, each insulated glazing unit 3 has two glazing panels (9, 10). The two glazing (9, 10) panels are arranged in parallel spaced apart relationship. The distance between adjacent surfaces of a pair of spaced apart glazing panels is a predetermined fixed distance, thereby to provide an insulating air or gas pocket 8 between the panels (9, 10).

[0073] The distance between adjacent surfaces of a pair of spaced apart glazing panels can vary to suit the insulating requirements of a particular application, including to account for the anticipated environmental conditions for that application. The distance between the panels (9, 10) may be, for example but not limited to, 6mm. In the illustrated embodiment, each glazing panel may have a thickness of, for example but not limited to, 5mm such that the distance between opposing external surfaces of the pair of spaced apart glazing panels (9, 10) of an insulated glazing unit is approximately 22 mm.

[0074] In the illustrated embodiment, each insulated glazing unit 3 has two glazing panels (9, 10). The two glazing panels (9, 10) are arranged, in use, to form an interior glazing panel 9 and an exterior glazing panel 10. Referring to Figure 2, the two insulated glazing panels (9, 10) of each insulated glazing unit 3 are in parallel spaced apart relationship such that, when the glazing units 3 are in the closed position, the interior glazing panel 9 of all the glazing units 3 are vertically aligned or stacked, and the exterior glazing panel 10 of all the glazing units 3 are vertically aligned or stacked. The vertical alignment of the exterior panels 10 advantageously provides a flush and streamline exterior visual aesthetic to the window assembly when it is closed.

[0075] Each glazing panel (9, 10) is generally rectangular or square in shape. Each glazing panel (or pane or blade) can be formed of a transparent, translucent or opaque material. In certain applications, each glazing panel (9, 10) is made from glass. However, it will be appreciated that the glazing panels can be formed of other materials such as, for example, plastic or timber.

[0076] In the illustrated embodiment, the interior glazing panel 9 is made of the same material from that which the exterior glazing panel 10 is made. However, it will be appreciated that, in other embodiments, the interior glazing panel can readily be made of a different material from that which the exterior glazing panel is made.

[0077] In the illustrated embodiment, the interior glazing panel 9 of each of the plurality of insulated glazing units 3 is made of the same material, and the exterior glazing panel 10 of each of the plurality of insulated glazing units 3 is made of the same material. However, it will be appreciated that, in other embodiments, the interior glazing panel 9 of some of the plurality of insulated glazing units 3 can be made of a different material to that from which the interior panel 9 of the other of the plurality of insulated glazing units 3 is made. Similarly, the exterior glazing panel 10 of some of the plurality of insulated glazing units 3 can be made of a different material to that from which the exterior panel of the other of the plurality of insulated glazing units is made.

[0078] Referring to Figure 1 , the length of the interior glazing panel 9 is greater than the length of the exterior glazing panel 10. This difference in length between the interior glazing panel 9 and the exterior glazing panel 10 advantageously provides each insulated glazing unit 3 with a stepped left edge and a stepped right edge. As described in detail below, these stepped edges provide a simple, efficient and yet robust construction which can be readily attached to an end clip, mount or bracket, thereby to enable each insulated glazing unit to be pivotally mounted to the frame 2.

[0079] In the illustrated embodiment, the width (or height) of the interior glazing panel 9 is substantially the same as the width (or height) of the exterior glazing panel 10. Similarly, the thickness of the interior glazing panel 9 is substantially the same as the thickness of the exterior glazing panel 10. However, it will be appreciated that, in other embodiments, these relative dimensions may vary.

[0080] As most clearly seen in the enlarged portion of Figure 2, the two glazing panels (9, 10) are held in parallel spaced apart relationship by a spacer 7 arranged intermediate or otherwise between the two glazing panels (9, 10). In the illustrated embodiment, the spacer 7 is formed of an elongate member and has a constant rectangular cross-sectional profile. The spacer may have a width of, for example but not limited to, 12mm. The spacer 7 is arranged to extend along the inner edges of the inner surface of the interior and exterior glazing panels (9, 10). The spacer extends continuously around the periphery of the inner surface of the glazing panels (9, 10). By surrounding or bordering the periphery of the interior glazing panels (9, 10), the spacer 7 advantageously leaves a substantially open area within the middle of the glazing panels (9, 10), and the glazing unit 3 itself, such that it only offers a limited visual obstruction to light and observation through the insulated glazing unit 3.

[0081] Given the length of the interior glazing panel 9 is greater than the length of the exterior glazing panel 10, the vertical elements or portions of the spacer 7 are positioned inwardly from the respective vertical inner (left and right) side edges of the exterior glazing panel. As such, a left end portion 11 of the interior glazing panel projects outwardly (i.e. to the left) from the left edge of the spacer and the corresponding left edge of the exterior glazing panel. In such embodiments, a right end portion of the interior glazing panel projects outwardly (i.e. to the right) from the right edge of the spacer and the corresponding right edge of the exterior glazing panel. Preferably, a central (vertical) axis of the interior glazing panel is aligned with the central (vertical) axis of the exterior glazing panel such that the extent to which the left end portion of the interior glazing panel projects outwardly from the left edge of the spacer (and exterior glazing panel) is the same as the extent to which the right end portion of the interior glazing panel projects outwardly from the right end portion of the spacer (and exterior glazing panel).

[0082] The interior and exterior glazing panels (9, 10) are secured to the spacer element 7 with an adhesive. The adhesive is applied to the respective interior and exterior faces of the spacer 7 which contact the respective inner faces of the interior and exterior glazing panels (9, 10) in mating face-to face abutment. Due to the interior and exterior glazing panels (9, 10) being held together via the spacer 7, each insulated glazing unit 3 advantageously has a frameless construction. In this context, the term “frameless” is intended to mean that each insulated glazing unit 3 does not have a frame formed of a rigid metal such as a metal (e.g. aluminium) surrounding the glazing panels (9, 10) of the glazing unit 3.

[0083] Each insulated glazing unit 3 has an upper sealing element 12 and a lower sealing element 13. When the plurality of insulated glazing units 3 is in the closed position as shown in Figure 2, the lower sealing element 13 of a first (upper) insulated glazing unit 3 is in sealing engagement with the upper sealing element 12 of an adjacent, second (lower) insulated glazing unit 3.

[0084] This sealing engagement between the lower sealing element 13 of a first insulated glazing unit 3 and the upper sealing element 12 of an adjacent, second insulated glazing unit 3 advantageously ensures that there is no panel-on-panel, particularly no pane-to-pane or glass- to-glass, contact between adjacent insulated glazing units 3. That is, adjacent edges of the glazing panels do not overlap with each other, or otherwise contact each other. Rather, this arrangement advantageously ensures that there is a direct seal-on-seal engagement between the respective upper and lower sealing elements (12, 13), which enhances the protection against undesired ingress of rainwater and wind, and provides improved thermal performance to the plurality of insulated glazing units 3 and the window assembly 1 as a whole.

[0085] In addition, as shown in Figure 2, the adjacent edges of the glazing panels are vertically spaced apart when in the closed position, which allows the respective upper and lower glazing panels to be brought into direct overhead, vertical alignment with other, thereby providing a flush exterior visual aesthetic. The upper and lower insulating elements (12, 13) have complementary configurations, thereby to facilitate the vertical alignment of the glazing panels in the closed position.

[0086] As most clearly seen in the enlarged portion of Figure 2, the lower sealing element 13 is mounted to, or adjacent to, the operatively lower or bottom edge of the glazing panels (9, 10) of the respective insulated glazing unit 3. The lower sealing element 13 is generally L-shaped. The generally L-shaped lower sealing element 13 has a first arm 14 configured to facilitate mounting of the lower sealing element 13 to, or adjacent to, the lower or bottom edge of the insulated glazing unit 3, and a second arm 15 extending orthogonally (downwardly, in use) from the first arm 14, wherein at least a portion (e.g. towards the distal end) of the second arm 15 matingly engages (e.g. in face-to-face abutment) the upper sealing element 12 associated with the adjacent (i.e. lower) insulated glazing unit 3. The distal end 16 of the second arm 15 of the lower sealing element 13 overlaps the upper edge of the exterior glazing panel of the adjacent (lower) insulated glazing unit 3.

[0087] The lower sealing element 13 has an attachment formation 17 associated with its first arm 14. The attachment formation 17 is configured to facilitate attachment of the lower sealing element 13 to the lower or bottom edge of the respective insulated glazing unit 3. In the illustrated embodiment, the attachment formation is in the form of a pair of hook-type projections 17 extending from a rear surface of the first arm 14 of the lower sealing element 13. The one or more projections 17 are configured to facilitate attachment to the lower or bottom edge of the respective insulated glazing unit. Each projection 17 extends continuously along the length of the first arm 14. In the illustrated embodiment, the pair of hook-type projections 17 are securely embedded within the lower spacer member 7 of the glazing unit 3, thereby to secure the lower sealing element 13 against the lower edge of the glazing unit 3.

[0088] The second arm 15 of the lower sealing element 13 includes a seal extension 18. The seal extension 18 extends inwardly from an operatively inner surface of the second arm 15, thereby to define or increase the size of the sealing surface that matingly engages the upper sealing element 12 of the adjacent insulated glazing unit 3. In the illustrated embodiment, the seal extension 18 extends at an angle relative to the second arm 15 of the lower sealing element 13. The angle at which the seal extension 18 extends relative to the second arm 15 of the lower sealing element 13 is such that the seal extension 18 is upwardly inclined when the glazing units 3 are in the closed position, in use. [0089] The first arm 14 of the lower sealing element 13 includes a seal web or fin 19. The seal fin 19 extends from a free distal end of the first arm 14, thereby to provide an engagement surface against which the upper sealing element 12 of the adjacent (lower) glazing unit 3 can engage when the glazing units 3 are in the closed position. In the illustrated embodiment, the seal fin 19 extends downwardly when the glazing units 3 are in the closed position. The seal fin is resiliently flexible, whereby the seal fin 19 moves or flexes inwardly (i.e. towards an interior of the glazing unit 3) when glazing units 3 are in the closed position and the seal fin 19 is in sealing engagement with the upper sealing element 12 of the adjacent (lower) glazing unit 3. The seal fin extends continuously along the length of the first arm.

[0090] The first arm 14 of the lower sealing member 13 includes a stiffening element or formation 20. The stiffening element 20 is arranged such that, in use, it can be located about the midpoint between the pair of glazing panels (9, 10) of the insulated glazing unit 3. In the illustrated embodiment, the stiffening element 20 has a curved or generally C-shaped cross- sectional profile. This profile may correspond to a sector of an annulus such as, for example, three-quarters or two-thirds of an annulus. The stiffening element 20 has an open side that faces toward the interior of the respective glazing unit 3. Advantageously, the stiffening element 20 can be at least partially embedded in the lower spacer member 7 of the respective glazing unit 3. The stiffening element 20 extends continuously along the length of the first arm 14.

[0091] The upper sealing element 12 is mounted to, or adjacent to, the operatively upper or top edge of the glazing panels (9, 10) of the respective insulated glazing unit 3. The upper sealing element 12 is generally L-shaped. The generally L-shaped upper sealing element 12 has a first arm 21 configured to facilitate mounting of the upper sealing element 12 to the upper or top edge of the insulated glazing unit 3, and a second arm 22 extending orthogonally (upwardly, in use) from the first arm 21 such that, in use, at least a portion (e.g. towards the distal end) of the second arm 22 matingly engages (e.g. in face-to-face abutment) the lower sealing element 13 associated with the adjacent (upper) insulated glazing unit 3. The distal end 23 of the second arm 22 of the upper sealing element overlaps the lower edge of the interior glazing panel 9 of the adjacent (upper) insulated glazing unit when the glazing units 3 are in the closed position.

[0092] The upper sealing element 12 has an attachment formation 24 associated with its first arm 21 . The attachment formation 24 is configured to facilitate attachment to the upper or top edge of the respective insulated glazing unit 3. In the illustrated embodiment, the attachment formation includes a pair of hook-type projections 24 extending from a rear surface of the first arm 21 of the upper sealing element 12. The pair of projections 24 extend continuously along the length of the first arm and are configured to facilitate attachment to the upper or top edge of the respective insulated glazing unit. The pair of hook-type projections 24 are embedded within the upper spacer member 7 of the glazing unit 3, thereby to secure the upper sealing element 12 to the upper edge of the glazing unit 3.

[0093] The second arm 22 of the upper sealing element 12 includes a seal extension 25. The seal extension extends inwardly from an operatively inner surface of the second arm 22, thereby to define or increase the size of the sealing surface that matingly engages the lower sealing element 13 of the adjacent insulated glazing unit 3. The seal extension 25 extends at an angle relative to the second arm 22 of the lower sealing element 13. The angle at which the seal extension 25 extends relative to the second arm 22 of the lower sealing element 13 is such that the seal extension 25 is downwardly inclined when the glazing units are in the closed position, in use.

[0094] The first arm 21 of the upper sealing element 12 includes a seal web or fin 26. The seal fin 26 extends from a free distal end of the first arm 21 , thereby to provide an engagement surface against which the lower sealing element 13 of the adjacent (upper) glazing unit 3 can engage when the glazing units 3 are in the closed position. The seal fin 26 extends upwardly, in use. The seal fin 26 is resiliently flexible, whereby the seal fin moves or flexes inwardly (i.e. towards an interior of the glazing unit 3) when glazing units 3 are in the closed position and the seal fin 26 is in sealing engagement with the lower sealing element 13 of the adjacent (upper) glazing unit 3. The seal fin 26 extends continuously along the length of the first arm 21 .

[0095] The first arm 21 of the upper sealing member 12 includes a stiffening element or formation 27. The stiffening element 27 is arranged such that, in use, it can be positioned about the midpoint between the pair of glazing panels (9, 10) of the insulated glazing unit 3. The stiffening element has a generally curved or C-shaped cross-sectional profile, which corresponds to a sector of an annulus such as, for example, three-quarters or two-thirds of an annulus. The stiffening element 27 has an open side which faces toward the interior of the respective glazing unit. Advantageously, the stiffening element 27 can be at least partially embedded in the upper spacer member 7 of the respective glazing unit 3. The stiffening element 27 extends continuously along the length of the first arm 22.

[0096] A top or head seal 28 is mounted to, or adjacent to, the head 4 of the frame 2. The head seal 28 is adapted to sealingly engage the upper sealing element 12 of the uppermost insulated glazing unit 3 of the plurality of insulated glazing units. The head seal 28 is generally L-shaped and has a first arm 29 configured to facilitate mounting to the head 4 of the frame 2, and a second arm 30 extending orthogonally (downwardly, in use) from the first arm 29, wherein at least a portion of the second arm 30 (e.g. a portion towards the distal end) matingly engages (e.g. in face-to-face abutment) the upper sealing element 12 associated with the uppermost insulated glazing unit 12. The distal end of the second arm 30 overlaps the upper edge of the exterior glazing panel 10 of the uppermost insulated glazing unit 3.

[0097] The first arm 29 of the head seal 28 includes a seal web or fin 31. The seal fin 31 extends from a free distal end of the first arm 21 , thereby to define or provide an engagement surface against which the upper sealing element 12 of the uppermost glazing unit 3 can engage when the glazing units 3 are in the closed position. The seal fin 31 extends downwardly, in use. The seal fin 31 is resiliently flexible, whereby the seal fin 31 moves or flexes inwardly (i.e. towards an interior of the glazing unit 3) when glazing units 3 are in the closed position and the seal fin 31 is in sealing engagement with the upper sealing element 13 of the uppermost glazing unit 3. The seal fin 31 extends continuously along the length of the first arm 29. The first arm 29 of the head seal 28 includes a stiffening element or formation, which extends continuously along the length of the first arm 29.

[0098] The head seal 28 has an attachment formation 32 associated with its first arm 29. The attachment formation 32 is configured to facilitate attachment to the head 4 of the frame 2. In the illustrated embodiment, the attachment formation includes a pair of hook-type projections 32 extending from a rear surface of the first arm 29 of the head seal 28. These projections extend continuously along the length of the first arm 29.

[0099] The head 4 may include a groove, slot or track of complementary configuration to the attachment formation (e.g. a pair of hook-type projections) for receiving the respective projection, thereby to attach the head seal to the frame. In some embodiments, one or more fasteners such as, for example, mechanical fasteners including but not limited to screws, rivets, nails, clips, staples and the like, and/or an adhesive, may also be used to facilitate the connection to the head, either alone or in combination with complementary mounting grooves, slots or tracks

[0100] A bottom or sill seal 33 is mounted to, or adjacent to, the sill 5 or an adjacent bottom member of the frame 2. The sill seal 33 is adapted to sealingly engage the lower sealing element 13 of the lowermost insulated glazing unit 3 of the plurality of insulated glazing units. The sill seal 33 is generally L-shaped and has a first arm 34 configured to facilitate mounting to the sill 5, and a second arm 35 extending orthogonally (upwardly, in use) from the first arm 34, wherein at least a portion of the second arm 34 (e.g. a portion towards the distal end) matingly engages (e.g. in face-to-face abutment) the lower sealing element 13 associated with the lowermost insulated glazing unit 3. The distal end of the second arm 35 overlaps the lower edge of the interior glazing panel 9 of the lowermost insulated glazing unit 3.

[0101] The first arm 34 of the sill seal 33 includes a seal web or fin 36. The seal fin 36 extends from a free distal end of the first arm 21 , thereby to define or provide an engagement surface against which the lower sealing element 13 of the lowermost glazing unit 3 can engage when the glazing units 3 are in the closed position. The seal fin 36 extends upwardly, in use. The seal fin 36 is resiliently flexible, whereby the seal fin 36 moves or flexes inwardly (i.e. towards an interior of the glazing unit 3) when glazing units 3 are in the closed position and the seal fin 36 is in sealing engagement with the lower sealing element 13 of the lowermost glazing unit 3. The seal fin 36 extends continuously along the length of the first arm 34. The first arm 34 of the sill seal 33 includes a stiffening element or formation, which extends continuously along the length of the first arm 34.

[0102] The sill seal 33 has an attachment formation 37 associated with its first arm 34. The attachment formation 37 is configured to facilitate attachment to the sill 5 of the frame 2. In the illustrated embodiment, the attachment formation includes a pair of hook-type projections 37 extending from a rear surface of the first arm 34 of the sill seal 33. These projections extend continuously along the length of the first arm 34.

[0103] The sill 5 may include a groove, slot or track of complementary configuration to the attachment formation (e.g. a pair of hook-type projections) for receiving the respective projection, thereby to attach the sill seal to the frame. In some embodiments, one or more fasteners such as, for example, mechanical fasteners including but not limited to screws, rivets, nails, clips, staples and the like, and/or an adhesive, may also be used to facilitate the connection to the sill, either alone or in combination with complementary mounting grooves, slots or tracks

[0104] Referring to Figure 1 , each insulated glazing unit 3 is mounted between a pair of end mounts, brackets or clips 38. Each end clip 38 is pivotally mounted to a respective side jamb 6 of the frame 2, thereby to facilitate selective pivotal movement of the respective insulated glazing unit between its closed and open positions. In some embodiments, the end clips may be connected directly to the jamb 6. In the illustrated embodiment, the end clips are indirectly connected to the jamb 6 such as, for example, via a C- or U-shaped channel 49. The channel 49 is snap-fittingly connected to the jamb 6. To facilitate this snap-fitting connection, the channel 49 has a pair of clasping elements or lips which securely engage (e.g. in interfering abutting engagement) complementary retaining elements (e.g. lugs, projections, rails or the like) formed in the jamb 6. Advantageous, each clip 38 has a flat front surface 39, which is aligned or flush with the exterior surface of the exterior glazing panel 10 of the insulated glazing unit 3, in use.

[0105] Each end clip 38 is adapted to be attached to a side edge 11 of the insulated glazing unit 3. Each end clip 38 has a receiving formation 40 in the form of a recess, groove or opening adapted to receive at least a portion of the respective side edge 11 of the insulated glazing unit 3. The shape or profile of the receiving formation complementary to that of the portion of the glazing unit 3 to be received therein. In the illustrated embodiment, the receiving formation is adapted to receive at least a portion of the side edge portion 11 of the interior glazing panel 9 which projects outwardly of the exterior glazing panel 10 (and the remainder of the glazing unit 3).

[0106] The side edge portion 11 of the interior glazing panel 9 to be received in the receiving formation 38 of the end clip 38 has a hole 41 formed therein. The hole 41 is configured to allow a retaining element in the form of a retaining pin 42 to be received therein, and thereby to secure the glazing unit 3 to the end clip 38. The retaining element extends in a direction perpendicular to the interior glazing panel 9. The retaining pin 42 can be releasably secured to the end clip 38 within the passageway 43. The ability to selectively install and release the pin 42 advantageously enables the glazing units to be handled and installed onsite.

[0107] Each end clip has a passageway 43 which is positioned such that the hole 41 in the interior glazing panel 9 can be aligned therewith, whereby the retaining pin 42 can be passed into the passageway 43 and through the hole 41 in the interior glazing element 9. The passageway 43 includes a pair of aligned through holes formed in sidewalls of the receiving formation of each end clip 38, through which the retaining pin 42 passes. Each end clip has an abutment surface or stop 46 arranged to define the end of the passageway 43, and thereby to limit the extent to which the retaining pin can pass into the passageway 43 such that it is seated within the hole 41 of the interior glazing panel 9 and thus holding the glazing unit 3 securely in position relative to the end clip 38.

[0108] A first brush seal 45 is arranged between the end clip 38 and a side jamb 6 of the frame 2, thereby to form a seal against ingress of rainwater and wind. A pair of first brush seals 45 is provided, wherein one is arranged between a left side end clip 38 and a left side jamb 6, and the other is arranged between a right side end clip 38 and a right side jamb 6. The first brush seal 45 is elongate and formed of a resiliently deformable material. In the illustrated embodiment, the first brush seal 45 is mounted in a first seal receiving formation 46 such as, for example, a groove or track in which the first brush seal 45 is securely mounted. The first seal receiving formation 46 is aligned with the receiving formation 40 for the insulated glazing unit 3.

[0109] A second brush seal 47 is arranged between the end clip 38 and the insulated glazing panel 3, thereby to inhibit water ingress between the glazing panels of the insulated glazing unit. A pair of second brush seals 47 is provided, wherein one is arranged between a left side end clip and a left side of the insulated glazing panel, and the other is arranged between a right side end clip and a right side of the insulated glazing panel. The second brush seal 47 is elongate and formed of a resiliently deformable material. In the illustrated embodiment, the end clip 38 has a second seal receiving formation 48 such as, for example, a groove or track in which the second brush seal is securely mounted. The second seal receiving formation 48 is aligned with the exterior glazing panel 10, preferably an inner face of the exterior glazing panel 10 of the insulated glazing unit 3.

[0110] The plurality of insulated glazing units 3 are each interconnected such that they move in unison. In some embodiments, a connecting rod or bar (not shown) extends along at least one side of the glazing units, the connecting rod or bar being connected to each glazing unit by respective linkage elements, whereby a (vertical, upwards or downwards) movement of the connecting bar causes a corresponding movement of each of the glazing units such that they move in unison. For example, a downward movement of the connecting rod may cause each of the glazing units to move from the closed position towards the open position. Similarly, for example, an upward movement of the connecting rod may cause each of the glazing units to move from the open position towards the closed position. In some embodiments, the connecting rod can be positioned at one or more positions intermediate the extreme limits of movement of the connecting rod, thereby to enable selective positioning of the glazing panels at orientations between those associated with the fully open and closed positions. In some embodiments, an operating lever or handle is operatively connected to the connecting rod, whereby movement of the operating lever causes a corresponding movement of the connecting rod which in turns causes a corresponding movement of each of the connected glazing units.

[0111] In some embodiments, a motor or drive unit is operatively connected to the plurality of glazing unit (e.g. via a chain or belt, etc), wherein operation of the motor or drive unit in a first direction causes each of the glazing units to move from the closed position towards the open position, and operation of the motor or drive unit in a second direction causes each of the glazing units to move from the open position towards the closed position.

[0112] The invention in its various preferred forms provides a number of unique attributes and advantages, including improved sealing between pivotal insulated glazing units. The improved sealing enhances the ability of the window assembly to inhibit water and air ingress in a range of weather and environmental conditions. Furthermore, the various sealing elements in combination with the insulated glazing units (e.g. double pane glazing units) advantageously enables window assemblies to be formed with a relative low U-value and thus offering high thermal performance. In these and other respects, the invention represents a practical and commercially significant improvement over the prior art.

[0113] 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. It should also be understood that the various aspects and embodiments of the invention as described can be implemented either independently, or in conjunction with all viable permutations and combinations of other aspects and embodiments. All such permutations and combinations should be regarded as having been herein disclosed.