GB2624658A

GB2624658A - A dam

Info

Publication number: GB2624658A
Application number: GB2217577.2A
Authority: GB
Inventors: Redshaw Adrian
Original assignee: Garner Aluminium Extrusions Ltd
Current assignee: Garner Aluminium Extrusions Ltd
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2024-05-29
Also published as: GB202217577D0

Abstract

A dam 28 for fitting to a door assembly comprises a body 34 for location in a channel 30 of a door threshold or head rail. The body is configured to at least partially obstruct a fluid flow path formed between the channel and a lip edge of each of the first and second side walls 31a, b. The body comprises a fixing arrangement to engage with the channel and a conforming arrangement to bias the body against the first and second side walls. A first sealing surface on the dam forms a seal with at least a first door leaf when in a closed position, the first sealing surface extending at least partially in a direction perpendicular to the longitudinal axis of the channel. The conforming arrangement may be in the form of a wedge, and the body may comprise first and second sections. A packer 39 can be used to raise the height of the dam. The first sealing surface may be formed of a resilient material. A door assembly includes a dam which may be positioned in the threshold below a sliding door interlock.

Description

FIELD

The present teachings relate to a dam for fitting to a door threshold or head rail of a door assembly, and a door assembly for a fenestration unit.

BACKGROUND

Door assemblies, for example lift and slide door assemblies, are typically used to close openings in internal or external walls of buildings, for example domestic or commercial buildings. When the wall is external, the door is exposed to environmental conditions.

Typically, the door assembly includes an outer frame including a threshold, and at least two door leaves. One or both door leaves may slide to open. Lift and slide door assemblies include a mechanism to lift at least one of the door leaves relative to the threshold, and to slide one of the door leaves relative to the outer frame. Such an arrangement is advantageous because friction acting on the sliding door leaf (for example due to seals contacting the sliding door leaf) is reduced compared to arrangements where the door leaf is not lifted relative to the threshold.

The threshold typically includes a track for supporting and guiding each door leaf that slides. The tracks may be in the form of a channel and/or a channel may be provided intermediate the tracks. The channel(s) in the threshold serve the function of catching and draining fluid (typically rainwater) out of the door assembly and preventing fluid from entering the building. This can otherwise damage the fabric of the building or its contents.

Similarly, a head rail of the outer frame represents a further location where sealing and insulation can be compromised for sliding doors Additionally, it is important that when the door assembly is in the closed position, a seal is maintained to increase thermal and sound insulation of the door assembly.

The present teachings seek to overcome or at least mitigate one or more problems associated with the prior art.

SUMMARY

A first aspect of the teachings provides a dam for fitting to a door threshold or head rail of a door assembly comprising a first door leaf, the threshold or head rail having a channel defining a longitudinal axis, opposing first and second side walls and an intermediate wall extending between the first and second side walls, the dam comprising: a body configured to locate in the channel of the door threshold or rail; wherein the body is configured to at least partially obstruct a fluid flow path formed between the channel and a lip edge of each of the first and second side walls; wherein the body comprises a fixing arrangement configured to engage with the channel of the door threshold; wherein the body comprises a conforming arrangement configured to bias the body against the first and second side walls of the channel; and a first sealing surface configured form a seal at least with the first door leaf when the first door leaf is in a closed position, wherein the first sealing surface extends at least partially in a direction perpendicular to the longitudinal axis of the channel.

Advantageously, the dam helps to prevent the migration of fluid (for example rain water and/or air) from the channel of the threshold to the interior side of the door assembly, thereby reducing the risk of damp causing damage to the fabric of the building. The sealing surface helps to improve sound and/or thermal insulation of the door assembly when the door leaf is in the closed position by creating a seal with the first door leaf.

The fixing arrangement may comprise at least one guide configured to engage with a corresponding formation of the channel, and the conforming arrangement may be configured to bias the at least one guide into engagement with the first and/or second side wall of the channel.

Advantageously, the at least one guide is simple to manufacture and assemble in the channel, and helps to correctly align the dam with respect to the channel.

The at least one guide may comprise a first guide located on an exterior side of the body configured to engage with a first corresponding formation on the first side wall of the channel, and a second guide located on an interior side of the body configured to engage with a second corresponding formation on the second side wall of the channel.

Advantageously, the use of first and second guides further improves the alignment of the dam in relation to the channel and help to correctly position the dam in a direction running between the first and second side walls of the channel. Additionally, the guides each create a surface with which the sealing surface can engage and therefore helps to improve the seal formed between the dam and the first door leaf.

The conforming arrangement may be a wedging arrangement, and the wedging arrangement may be configured to engage with the first and second side walls of the channel.

Advantageously, the wedging arrangement reduces gaps between the body and the side walls of the channel, thereby improving the seal formed between the sealing surfaces and the interior and exterior of the door assembly.

The body may comprise a first section and a second section forming the wedging arrangement, and the first and second sections may be configured to exert a force on the first and second side walls of the channel.

The first section may be of substantially the same configuration to the second section.

Advantageously, the body being formed from two sections simplifies the assembly process because the sections of the body can be inserted into the threshold separately and then assembled together. The first and second section create a wedging effect, and help to improve the seal between the interior and exterior of the door assembly.

When the first section of the body and the second section of the body are in an assembled state, the body may be substantially rectangular and the first section may be configured to engage with the first side wall of the channel and the second section may be configured to engage with the second side wall.

The first and second sections may meet at an edge which is configured to be angled relative to the longitudinal axis of the channel.

Advantageously, the rectangular body fits and aligns with the channel of the threshold, and is therefore simple to assemble.

The body may be formed from a second section including the first sealing surface, and a first section including the fixing arrangement, and the first section may be configured to provide structural support to the second section.

The first section may be manufactured from a substantially rigid material, and the second section may be manufactured from a substantially resilient material.

Advantageously, the first section provides the sealing benefits, whilst the second section provides structural strength to the dam.

A height of the dam in a direction perpendicular to the longitudinal axis of the channel

may be adjustable.

Advantageously, the adjustability of the height of the dam makes the dam suitable for use in thresholds channels having different depths. This is because the height of the dam can be adjusted such that the sealing surface creates a seal with the door leaf when the door leaf is in the closed position, regardless of the height of the channel.

The dam may further comprise a packer secured to the dam and configured to locate between the intermediate wall of the channel and the dam, and the packer may be configured to raise the door threshold a predetermined height from the intermediate wall of the channel.

The packer may be releasably secured to the dam.

Advantageously, the packer is easy to manufacture and to secure to/release from the dam to adjust the height of the dam.

The packer may be injection moulded with at least a portion of the body.

Advantageously, manufacturing the packer with the body reduces the number of manufacturing steps as well as the number of parts, thereby simplifying manufacture.

The packer may include at least one engagement formation, and the engagement formation may be configured to engage with the body to releasably secure the packer to the body.

Advantageously, the engagement formation helps to correctly align the packer with respect to the body, thereby improving ease of assembly.

The first sealing surface may be configured to extend from the first side wall of the channel to the second side wall of the channel.

Advantageously, the sealing surface extending between the side walls of the channel further improves the insulation of the door assembly and aims to close the flow path of fluid from the channel over the side walls and into the interior of the door assembly.

The first sealing surface may be formed from a resilient material.

Advantageously, resilient materials deform and therefore create a seal between the sealing surface and the door leaf.

The first sealing surface may comprise at least one bubble seal or a gasket e.g. a flipper gasket.

The at least one flipper gasket may comprise a first flipper gasket and a second flipper gasket located adjacent the first flipper gasket, and the first flipper gaskets may be located at a first end of the body.

Advantageously, the inclusion of separate deformable creates an additional barrier between the channel and the interior/exterior sides of the door assembly and therefore improves the sealing and insulation properties of the door assembly.

The conforming arrangement may be the first and/or second flipper gasket, and the flipper gasket may be configured to bias the second section of the body against the first and second side walls of the channel.

The dam may further comprise a second sealing surface.

The second sealing surface may be of substantially the same configuration to the first sealing surface.

Advantageously, the second sealing surface further improves the insulation and sealing of the dam by preventing the migration of fluid to the interior of the threshold via the second door leaf.

The first sealing surface may be located at a first end of the body and the second sealing surface may be located at a second end of the body opposing the first end of the body.

The fixing arrangement may be at least partially located in between the first and second sealing surfaces.

Advantageously, this enables the sealing surfaces to form a seal over the width of the overlap between the first and second door leaves.

The fixing arrangement may comprise at least one bore located on the body, and the at least one bore may be configured to receive a fixing.

The at least one bore may include a first bore configured to receive a first fixing, and a second bore configured to receive a second fixing, and the first and second bores may be configured to extend in a direction perpendicular to the longitudinal axis of the channel.

Advantageously, the at least one bore fixes the position of the dam in a direction parallel to the longitudinal axis of the channel, and maintained in the correct position for sealing.

A further aspect of the present teachings relate to a door assembly for a fenestration unit, the door assembly comprising: a threshold and/or a head rail comprising a channel defining a longitudinal axis, opposing first and second side walls and an intermediate wall; at least one door leaf having an open position and a closed position; and a dam according to the first aspect fitted within the channel of the threshold or the channel of the head rail, wherein the dam is configured to engage with the door leaf when the door is in the closed position.

The channel may comprise a corresponding formation configured to receive the fixing arrangement.

The threshold may comprise a thermal break located between an interior and an exterior side of the threshold, and the dam may be located between the thermal break and the door leaf.

The door assembly may further comprise a second door leaf, the first sealing surface may be configured to deform and form a seal with the second door leaf, and the door assembly may further comprise a door interlock configured to create a seal between the first and second door leaves, and the dam may be located between the door interlock and the channel of the threshold or the head rail.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described with reference to the accompanying drawings, in which: Figure 1 is a front view of a door assembly according to the present teachings viewed from an exterior side of the door assembly; Figure 2 is cross sectional view along the cross-section x-x of a threshold according to the present teachings, forming part of the door assembly of Figure 1; Figure 3 is a cross sectional view of an alternative embodiment of a threshold according to the present teachings, suitable for use in the door assembly of Figure 1; Figure 4 is an isometric view of the threshold of Figure 2 with a dam according to the present teachings fitted thereto; Figure 5 is an isometric view of the threshold of Figure 3 with an alternative embodiment of a dam according to the present teachings fitted thereto; Figure 6 is an isometric view of the dam of Figures 4 and 5 in a disassembled state; Figure 7 is an isometric view of a section of the dam of Figure 6 with a packer releasably secured thereto prior to assembly; Figure 8 is an isometric view along the section y-y of a head rail according to the present teachings with an alternative embodiment of a dam of the present teachings fitted thereto; Figure 9 is an isometric view of the dam of Figure 8 prior to fitting; Figure 10 is an isometric view of the head rail of Figure 8 with a further alternative embodiment of the dam of the present teachings fitted thereto; Figure 11 is an isometric view of the dam of Figure 10 is an unassembled state; and Figure 12 is an isometric view of the dam of Figure 10 in an assembled state.

DETAILED DESCRIPTION OF EMBODIMENT(S)

Referring firstly to Figure 1, a door assembly of an embodiment of the present teachings is generally indicated at 10. The door assembly of this embodiment is a lift and slide patio door, however in alternative embodiments the door assembly may be an alternative type of door or window assembly, such as a standard sliding door or window. The door assembly includes an outer frame assembly 12 including a threshold 14, and a head rail 15. The frame assembly 12 further includes first and second door jambs 17a, 17b extending between opposing ends of the threshold 14 and the head rail 15. The frame assembly 12 fits in an opening 9 in a wall 8, for example an external wall, of a domestic or commercial building.

The door assembly 10 includes at least two door leaves 20a, 20b mounted to the frame assembly 12, in this embodiment two door leaves 20a, 20b. The first door leaf 20a is slidably mounted relative to the frame assembly 12 and relative to the second door leaf 20b. The second door leaf 20b is a fixed door leaf, meaning that the position of the second door leaf 20b is fixed relative to the frame assembly 12. It shall be appreciated that in alternative embodiments, both of the door leaves 20a, 20b may be slidable door leaves, and/or one of the door leaves may be hinged to the frame assembly 12 such that the door leaf is pivotable relative to the frame assembly 12.

In order to facilitate sliding of the first door leaf 20a behind the second door leaf 20b, a plane of each of the first and second door leaves 20a, 20b are offset.

The frame assembly 12 of this embodiment further includes an actuation member 21, for example a handle 21, configured to be actuated by a user to facilitate sliding of the first door leaf 20a, as will be explained in more detail below.

Lift and slide patio door assemblies 10 of this type are typically used in external walls of domestic and commercial buildings. It is therefore necessary that the door assembly 10 meets requirements for sealing against water ingress and draining fluid (typically rainwater) from the door assembly 10.

The term "closed position" refers to the position of the door leaves 20a, 20b when a side of the first door leaf 20a remote from the second door leaf 20b abuts against the first door jamb 17a, and a side of the second door leaf 20b remote from the first door leaf 20a abuts against the second door jamb 17b. The term "open position" refers to the position of the door leaves 20a, 20b when they are in any other position within the frame assembly 12.

Each door leaf 20a, 20b includes a frame 22a, 22b and a glazing unit 24a, 24b. When in a closed position vertical frame members of the frames 22a and 22b are adjacent and overlap. This overlapping area is typically provided with a door interlock 16. It shall be appreciated that although the glazing units 24a, 24b in this embodiment are double glazing units, alternative glazing units, for example triple glazing or opaque panels, may be used.

The door interlock 16 includes a first interlock member (not shown) located on the first door leaf 20a and a second interlock member (not shown) located on the second door leaf 22b. The door interlock 16 is used to seal a gap formed between the sliding door leaf 20a and the fixed door leaf 20b when the door assembly 10 is in the closed position. This helps to prevent the ingress of moisture and heat transfer out of the door assembly 10, whilst improving security. The interlock 16 extends between the threshold 14 and the head rail 15.

The first and second interlock members (not shown) include corresponding elongate profiles which engage with each other when the door assembly 10 is in the closed position.

For example, the first and second interlock members may each include interlocking hook profiles with a seal extending along an elongate length thereof. It shall be appreciated that any suitable door interlock may be used.

As described above, the door leaf 20a is slidably connected to the frame assembly 12, meaning the door leaf 20a is retained within the frame assembly 12, whilst being moveable relative to the frame assembly 12. The door leaf 20a includes at least one rolling element (not shown) for facilitating sliding of the door leaf 20a relative to the frame assembly 12. The rolling element may include, by way of example, a set of wheels. It shall be appreciated that any suitable rolling element may be used.

In order to facilitate smooth sliding of the slidable door leaf 20a, the door leaf 20a is lifted off the threshold 14 when the user wishes to slide the door leaf 20a between the closed position and the open position. The lifting of the door leaf 20a off the threshold 14 reduces contact between the door leaf 20a and components of the threshold 14, such as seals, thereby reducing friction and contributing to smooth sliding of the first door leaf 20a.

The handle 21 is used to facilitate the lifting of the door leaf 20a off the threshold 14. In this embodiment, the handle is rotated 1800 in a first direction. The door assembly 10 includes an arrangement of gears and levers to lift the door leaf 20a off the threshold 14, as is known in the art. In order to close the door assembly 10, the handle is rotated 1800 in a second direction opposing the first direction and the door leaf 20a is lowered onto the threshold and sealed to the frame assembly 12.

In this embodiment the frames 22a, 22b, and the frame assembly 12 are manufactured from metal. Typically, the frames 22a, 22b and the frame assembly 12 are aluminium. The frames 22a, 22b and the frame assembly 12 of this embodiment comprise a 6063T6 aluminium alloy. However, it shall be appreciated that any other suitable material shall be used. In one alternative, the frames 22a, 22b and the frame assembly 12 are of some other suitable material, such as some other 6063 series aluminium alloy, or a 6060 series aluminium alloy.

However, the frames 22a, 22b and/or the frame assembly 12 may include features or components of some non-metallic or composite material, such as plastics material or wood. In particular, the frame assembly 12 includes external and internal aluminium profiles 50, 52, which provide structural strength to frame assembly 12, with a thermal break 26 of plastics material sandwiched therebetween.

The frame assembly 12 and the first and second frames 22a, 22b are manufactured from extruded aluminium members, however in alternative embodiments, any suitable manufacturing method may be used.

In this embodiment, the frame assembly 12 includes the threshold 14, at least one dam 28, 128 and a head rail 15. In this embodiment, a first dam 28 is fitted in the threshold 14, and a second dam 128 is fitted in the head rail 15. It shall be appreciated that in alternative embodiments, any of these features may be included or omitted. For example, only one dam 28, 128 may be fitted in one of the threshold 14 and the head rail 15. For door assemblies with more than two door leaves, more than one dam 28 may be fitted in the threshold 14, and/or more than one dam 128 may be fitted in the head rail 15.

The threshold 14 includes a channel 30 as illustrated in Figure 2 to acts as a means of collecting rainwater or debris that might otherwise cross the threshold. The interior profile 50 and the exterior profile 52 are located on the interior and exterior sides of the channel respectively. An interior track 54 is defined between the interior profile 50 and the thermal break 26. An exterior track 56 is defined between the exterior profile 52 and the thermal break 26. The interior track 54 supports the second door leaf 20a, and the exterior track 56 supports the first slidable door leaf 20a. The first channel 30 is therefore positioned between the interior and exterior tracks 54, 56. In this embodiment, a rail 53 extends along a longitudinal axis of the interior track 52 along which rollers (not shown) of the door leaf 20a are guided.

The first channel 30 defines a longitudinal axis and opposing first and second side walls 31a, 31b joined by an intermediate wall 31c. The first channel includes a first groove 33a located on the first side wall 31a, and a second groove 33b located on the second side wall 31b. The first and/or second groove 33a, 33b extending substantially along an entire length of the channel 30 and engage with the first dam 28. It shall be appreciated that in alternative embodiments, any suitable formation may be used to engage with the first dam 28.

The first dam 28 and the second dam 128 are axially aligned, in this embodiment substantially centrally along a longitudinal axis of the threshold 14 and a longitudinal axis of the header 15 respectively. The first dam 28 and/or the second dam 128 are located in line with the door interlock 16 of the first and second door leaves 20a, 20b. As described above, the door interlock 16 helps to seal the gaps formed between the first and second door leaves 20a, 20b in the closed position. However, it is possible for a flow path to form underneath the door interlock 16 from the exterior side of the door assembly 10, into the threshold 14, over the first side wall 31a and into the interior of the building. It is advantageous that a seal is created between the threshold 14 and the door leaves 20a, 20b at the door interlock 16. The first dam 28 is located between the thermal break 26 and the first and second door leaves 20a, 20b.

The first dam 28 extends from the first side wall 31a of the threshold 14 to the second side wall 31b of the threshold 14. The first dam 28 includes a body 34, a fixing arrangement 36a-d located on the body 34, a first sealing surface 38a and a second sealing surface 38b. The sealing surfaces are, in this embodiment, configured to deform and form a seal with the first door leaf 20a and the second door leaf 20b when the door assembly 10 is in a closed position.

The body 34 includes a conforming arrangement 40a, 40b configured to bias the body against the first and second side walls 31a, 31b. The conforming arrangement is a wedging arrangement 40a, 40b configured to engage with the first and second side walls 31a, 31b of the channel.

In this embodiment, the body 34 includes a first section 40a and a second section 40b which form the conforming arrangement 40a, 40b. The first and second sections 40a, 40b exert a force on the side walls 31a, 31b of the channel 30. This creates a wedging effect, and helps to improve the seal between the interior and exterior of the door assembly 10.

It shall be appreciated that in alternative embodiments, any of these features may be included or omitted. For example, the body may be formed from only one section and/or only one sealing surface may be provided. It shall be appreciated that the second dam 128 includes like parts with the first dam 28, and the differences will be discussed in more detail below.

In this embodiment, the first section 40a, the second section 40b are manufactured separately using an injection moulding process. The first and second section 40a, 40b are each manufactured with the respective packer 39. However, any suitable manufacturing technique may be used, and the first and second sections 40a, 40b of the body may be manufactured as a unitary body. Alternatively, the packer 39 may be manufactured separately with the first and/or second sections 40a, 40b.

In this embodiment, as illustrated in Figures 2 and 3, a height of the first dam 28 is adjustable. The adjustability of the height makes the dam 28 suitable for use in threshold channels 30 having different depths, as illustrated in Figures 2 and 3.

Figures 2 and 4 illustrate a first embodiment of the threshold 14, wherein the channel 30 defines a first height x1. Figures 3 and 5 illustrate a second embodiment of a threshold 114, wherein the channel 130 defines a second height x2. Like parts between the threshold 14 of Figure 2 and the threshold 114 of Figure 3 are labelled with the prefix "1". The adjustability of the height of the dam makes the dam 28 suitable for use in both the thresholds 14, 114 of Figures 2 and 3. It shall be appreciated that the heights x1 and x2 are exemplary, and any suitable height of the channel 30, 130 may be used.

In this embodiment, the adjustability of the height of the dam 28 is provided by a packer 39. The packer 39 is releasably secured to the dam 28 by at least one engagement formation 45a-c. In this embodiment, the engagement formation is a plurality of pegs 45a-c, illustrated in Figure 7. The pegs 45a-c extend from the packer and engage with corresponding formations (not shown) in the body 34. It shall be appreciated that in alternative embodiments, any suitable engagement formation may be used to releasably secure the packer 39 to the body 34. The packer 39 is configured to locate between the intermediate wall 31c and the dam 28. The packer 39 is configured to raise the dam 28 a predetermined height from the intermediate wall 31c of the channel 30.

The packer includes a bore 36g. When the packer 39 is releasably secured to the body 34, the bore 36g is aligned with bore 36c of the body 34 such that a fixing can extend 30 therethrough.

It shall be appreciated that in alternative embodiments, any suitable mechanism may be used to adjust the height of the dam 28. As such, the mechanism for adjusting the height may be fixedly secured to the body 34 of the dam 28. In

In this embodiment, the packer 39 is a substantially planar body corresponding to the shape of the body 34 of the first dam 28, as illustrated in Figure 7. The packer 39 may include any number of bodies releasably secured to each other so as to stack one on top of the other and adjust the overall height of the first dam 28. For example, in the embodiment of Figure 4, a first packer 39 is required for the depth of channel 30. In the embodiment of Figure 5, the packer 39 is removed entirely because the height of the channel 130 corresponds to the predetermined height of the body 34.

In some embodiments, a plurality of packers 39 may be required, for example if the channel is deeper than illustrated in Figures 4 and 5. The dam 28 may be provided with spare packers 39 for use in door assemblies 10 having deeper channels 30, 130.

As illustrated in Figure 7, the packer 39 is releasably secured to the first section 40a via a tab 43 connected to the first section 40a by a frangible fold line. The packer 39 can therefore be removed at the frangible fold line for fitting in the threshold 114 of Figure 3. Alternatively, the packer 39 can be removed at the frangible fold line such that a planar surface of the packer 39 abuts against a planar surface of the first section 40a and the packer 39 is releasably secured to the body 34.

It shall be appreciated that in alternative embodiments any suitable mechanism may be used to releasably secure the packer 39 to the first section 40a. Alternatively, the packer 39 may be provided separately and subsequently secured to the first section 40a.

The first dam 28, as described hereafter, is suitable for use in the thresholds 14, 114 of both Figure 2 and Figure 3. However, for reasons of conciseness and brevity, the first dam 28 will be described in relation to the threshold 14 of Figure 2.

It shall be appreciated that the term "uppermost" in all embodiments is taken to mean a location furthest away from the intermediate wall of the channel, and the term "lowermost" is taken to mean a location closest to the intermediate wall of the channel.

The body 34 is configured to at least partially obstruct a fluid flow path formed between the channel 30 and an uppermost lip of each of the first and second side walls 31a, 31b. The fluid built up in the channel 30 is therefore directed through drainage features in the threshold 14, instead of entering the interior of the building via gaps formed between the first and second door leaves 20a, 20b and the threshold 14. This helps to reduce the ingress of fluid from the channel 30 of the threshold 14 to the interior side of the door assembly 10, thereby reducing the risk of damp causing damage to the fabric of the building.

The first section 40a and the second section 40b of the body 34 are of substantially the same configuration. In some embodiments, the first section 40a and the second section 40b releasably fastened together when the body 34 is in an assembled state. The first section 40a and the second section 40b may be releasably fastened together using any suitable interlocking mechanism. The interlocking mechanism may be any form of mechanical fastening, such as a toothed or a push fit arrangement. The interlocking mechanism correctly aligns the second section 40b in relation to the first section 40a to fill the channel 30.

In order to assemble the body 34, the first section 40a and the second section 40b are each lowered into the channel 30 and slid relative to the channel 30 towards one another until the parts of the interlocking mechanism engage and releasably secure the first and second section 40a, 40b together.

When the first section 40a and the second section 40b are in the assembled state, the body 34 is substantially rectangular. Additionally, the uppermost and lowermost surfaces of the body 34 are substantially planar. The substantially planar lowermost surface corresponds to the planar intermediate wall 31c of the channel 30. It shall be appreciated that in alternative embodiments, any suitable shape of body 34 may be used. For example, any shape with a pair of parallel sides may be used.

In order to form a substantially rectangular body 34, the first section 40a is substantially triangular and the second section 40b is substantially triangular. The first and second sections 42a, 42b meet at a respective edge 46a, 46b of each section which are configured to be angled relative to the longitudinal axis of the channel 30. In this embodiment, the first section 40a and the second section 40b are substantially right-angled triangles.

The fixing arrangement 36a-d is configured to engage with the channel 30. In this embodiment, the fixing arrangement 36a-d includes a first side wall 36a located on the first section 40a, and a second side wall 36b located on the second section 40b.

In the assembled state, the side wall 36a of the first section 40a and the side wall 36b of the second section 40a engage with the first side wall 31a and the second side wall 31b of the channel 30 respectively. The side wall 36a is located on the interior side of the channel 30, and the side wall 36b is located on the exterior side of the body 34. The first and second side walls 36a, 36b therefore act as guides 36a, 36b. The guides 36a, 36b protrude to a height greater than a height of the planar uppermost surface of the first and/or second section 40a, 40b of the body 34. Additionally, the first and second side walls 36a, 36b extending between the side walls of the channel 30 helps to create a tight fit between the interior and exterior sides of the channel 30 and therefore blocks the flow of water therebetween.

As illustrated in Figures 2 to 4, the guides 36a, 36b engage with the corresponding first and second grooves 33a, 33b in the channel 30. This helps to correctly align the first dam 28 in a direction perpendicular to the longitudinal axis of the channel 30. The guides 36a, 36b and grooves 33a, 33b also help with assembly of the first dam 28 as the arrangement helps to facilitate aligned sliding between the channel 30 and the first dam 28.

In this embodiment, the fixing arrangement 36a-d includes at least one bore 36c, 36d located on the body 34. The at least one bore 36c, 36d is configured to receive a fixing (not shown), typically a screw. As shown in Figure 6, a first bore 36c is provided to receive a first fixing (not shown), and a second bore 36d is provided to receive a second fixing (not shown). The first bore 36c is located on the first section 40a, and the second bore 36d is located on the second section 40b. It shall be appreciated that the first and/or second bore 36c, 36d may be located at any suitable location on the body 34. In alternative embodiments, any suitable number of bores may be provided, for example four bores or one bore.

The first sealing surface 38a, 38b is configured to extend from the first side wall 31a of the channel 30 to the second side wall 31b of the channel 30. Although first and second sealing surfaces 38a, 38b are provided in the embodiment of Figures 2 to 7, it shall be appreciated that in alternative embodiments, any suitable number of sealing surfaces may be provided. The sealing surfaces 38a, 38b may extend only partially between the first and second side walls 36a, 36b. The first sealing surface 38a and the second sealing 38b are formed from a resilient material, for example synthetic rubber. The first sealing surface 38a and the second sealing surface 38b may be a bubble seal or a gasket.

The first and second sealing surfaces 38a, 38b are located on the surface of the dam 28 facing the respective first or second door leaf 20a, 20b. In the embodiment of the first dam 28, this is the uppermost surface. The first and/or second sealing surface 38a, 38b abut against the first and second guides 36a, 36b. The engagement with the first and/or second sealing surface 38a, 38b helps to improve the seal formed between the dam 28 and the first and second door leaves 20a, 20b because deformation of the first and/or second sealing surface 38a, 38b in a direction extending between the first and second side walls 31a, 31b is restricted.

The first and second sealing surfaces 38a, 38b are substantially parallel to one another. The first sealing surface 38a and the second sealing surface 38b are of substantially the same configuration. In this embodiment, the first sealing surface 38a is located at a first end of the body 34, and the second sealing surface 38b is located at a second end of the body 34 opposing the first end of the body 34. The at least one bore 36c, 36b is located in between the first sealing surface 38a and the second sealing surface 38b.

The first sealing surface 38a is located on the first section 40a of the body 34, and the second sealing surface 38b is located on the second section 40b of the body 34. Due to the overlap between the first and second door leaves 20a, 20b at the interlock 16, the first sealing surface 38a engages with both the first door leaf 20a and the second door leaf 20b, and the second sealing surface 38b engages with both the first door leaf 20a and the second door leaf 20b. As described above, when the first and second door leaves 20a, 20b are in the closed position, they are lowered relative to the channel 30, thereby deforming the first and second sealing surfaces 38a, 38b and creating a seal.

It shall be appreciated that in alternative embodiments, any suitable number of sealing surfaces may be used. For example, there may be a pair of sealing surfaces located at each end of the body 34.

To install the dam 28 in the channel 30 of the threshold 14, the packer 39 is first torn away from body 34 at the frangible line. The required number of packers 39 are secured to the body 34 such that the dam 28 is of the predetermined height required by the channel 30.

The first section 40a is slid into the channel 30 such that the first side wall 36a engages with the first groove 33a, and the second section 40b is slid into the channel 30 such that the second side wall 36b engages with the second groove 33b. The first and second sections 40a, 40b are wedged together, and the conforming arrangement 40a, 40b biases the side wall 36a, 36b against the side walls 31a, 31b of the channel 30. The fixings (not shown) are inserted into the first and second bores 36c, 36d and screwed into the thermal break 26.

A second embodiment of a dam 128 is illustrated in Figures 8 and 9. This dam 128 is intended to be located in the head rail 15 of the door assembly 10. The head rail 15 is of a similar configuration to the threshold 14. Like parts between the threshold 14 and the head rail 15 are labelled with the prefix "2". As discussed above, the function of the first and/or second sealing surfaces 138a-d differs from that of the first dam 28.

Like parts between the first dam 28 and the second dam 128 are labelled with the prefix With reference to Figures 8 and 9, although the dam 128 fitted in the head rail 15 may have to prevent some ingress of rainwater, the primary function is to reduce heat transfer out of the gaps between the first and second door leaves 20a, 20b and the head rail 15. Accordingly, the first and/or second sealing surfaces of the first dam 28 and the second dam 128 may differ because of the requirements of the threshold 14 and the head rail 15.

In the embodiment of Figures 8 and 9, the first sealing surface 138a includes a first flipper gasket 138a and the second sealing surface 138b includes a second flipper gasket 138b. The flipper gaskets 138a, 138b each include a substantially curved cross-section.

The flipper gaskets 138a, 138b are made of a resilient material, and are in the substantially curved position of Figures 8 and 9 when there is no external force exerted on the flipper gaskets 138a, 138b, i.e. the flipper gaskets 138a, 138b are relaxed. When the first door leaf 20a is slid along the track 256, and therefore raised relative to the threshold 14 and the head rail 15, the flipper gaskets 138a, 138b flex so as to allow the first door leaf 20a to slide relative to the dam 128 with minimal friction. When the door leaves 20a, 20b are in the closed position and therefore lowered relative to the threshold 14 and the head rail 15, the flipper gaskets 138a, 138b relax, but maintain contact with the door leaf 20a which creates a seal. This helps to minimise heat transfer from the interior of the building to the exterior of the building.

The flipper gaskets 138a and 138b of Figures 8 and 9 are supported on a first foot 160a and a second foot 160b. The first foot 160a is located on the first section 140a and the second foot 160b is located on the second section 140b. The first and second feet 160a, 160b extend from the body 134 in a direction towards the intermediate wall 231c of the channel 230.

The channel 230 includes at least one groove (not shown) for accommodating the first and second feet 160a, 160b. The at least one groove has a height approximately equal to a height of the first and second feet 160a, 160b such that the body 134 sits flush with the intermediate wall 231c of the channel 230 when the dam 128 is in the assembled position. The groove is cut into the thermal break 226. This helps to create the required clearance such that the door leaf 20a may be lifted relative to the threshold 14 and the head rail 15.

In the embodiment of Figures 8 and 9, the body 134 extends axially in both directions past the first flipper gasket 138a and past the second flipper gasket 138b. The axial extensions of the body 134 form a first attachment portion 162a of the body 134 and a second attachment portion 162a of the body 134. The first and second attachment potions 162a, 162b are used to attach the body 134 to the intermediate wall 231c of the channel 230 The first and second attachment portions 162a, 162b are coplanar with the body 134, such that the first and second attachment portions 162a, 162b are flush with the intermediate wall 231c of the channel 230.

The fixing arrangement 136a-f includes two additional bores 136e, 136f located on each of the first and second attachment portions 162a, 162b configured to each receive a fastener (not shown) and fasten the attachment portions 162a, 162b to the intermediate wall 231c. It shall be appreciated that in alternative embodiments, the attachment portions 162a, 162b may be omitted.

It shall be appreciated that any suitable number of flipper gaskets may be provided of any suitable configuration. Figures 10 to 12 shows an alternative embodiment of second dam 228. Like parts with the embodiment of Figures 8 and 9 are labelled with the prefix "2".

A third embodiment of the dam is illustrated in Figures 10 to 12. In this embodiment, there are a pair of flipper gaskets 238a-d provided at each end of the body 234. Put another way, the first sealing surface 238a, 238c includes a first flipper gasket 238a and a second flipper gasket 238c, and the second sealing surface 238b, 238d includes a first flipper gasket 238b and a second flipper gasket 238d. The first pair of flipper gaskets 238a, 238c are located at the first end of the body 234, and the second pair of flipper gaskets 238b, 238d are located at the second end of the body 234 opposing the first end.

In this embodiment, it is the first and second pair of gaskets 38a-d that form the conforming arrangement 38a-d. The first and second pairs 238a-d of gaskets extend between the first and second side wall 236a, 236b and bias the first and second side walls 236a, 236b against the first and second side walls 231a, 231b of the channel 230.

The first and second flipper gaskets 238a, 238c are spaced apart from one another, and the first and second flipper gaskets 238b, 238d are spaced apart from one another. The flipper gaskets 238a-d of this embodiment each include first and second side walls which taper towards one another to form a tooth-like cross-sectional profile. It shall be appreciated that in alternative embodiments, any suitable shape of flipper gasket may be used, such as a curved cross-sectional profile in a relaxed state thereof.

Figures 10 to 12 are an example of a dam 228 with a body 234 formed from a first and a second section 240a, 240b. The first and second bores 236c, 236d extend through the first and second section 240a, 240b. The second section 240b is manufactured from a resilient material, for example a flexible synthetic rubber material. The first pair of flipper gaskets 238a, 238c are located on the second section 240b, and the second pair of flipper gaskets 238b, 238d are located on the second section 240b. The second section 240b is located between the first section 240a and the intermediate wall 231c.

The first section 240a is manufactured from a rigid material such as stainless steel. In alterative embodiments, the first section 240a may be manufactured from any suitable material, such as a rigid plastics material such as uPVC. The first section 240a provides structural support to the second section 240b, and provide a surface for supporting the head of a fixing being screwed into the channel 230.

The first section 240a is located between the second section 240b and the first and second door leaves 20a, 20b. The first section 240a is substantially planar. The first section 240a extends between the first pair of flipper gaskets 238a, 238c and the second pair of flipper gaskets 238b, 238d. The first and second sections 240a, 240b include corresponding alignment formations for correctly aligning the first section 240a relative to the second section 240b. In alternative embodiments, the alignment features may be omitted.

The first section 240a includes the first and second side walls 236a, 236b. When the dam 228 is in the assembled position, the first and second pair of gaskets 238a-d engage with the first and second side walls 236a, 236b and urge the first and second side walls 236a, 236b away from one another. This helps to facilitate the engagement of the side walls 236a, 236b with the channel 230 and helps to improve sealing.

The embodiment of Figures 10 to 12 may be advantageous because there is not a requirement to form additional grooves in the channel 230, whilst allowing the lifted door leaf to slide under the dam 228.

In the embodiment of Figures 10 to 12, the side walls 236a, 236b are configured to fold relative to the body 234 via a live hinge. Figure 11 shows the side walls 236a, 236b in an unfolded position, and Figure 12 shows the side walls 236a, 236b in a folded position. In the assembled state, the side walls 236a, 236b are in the folded state such that the side walls 236a, 236b act as guides and engage with the corresponding grooves 233a, 233b in the channel 230.

The side walls adjacent the live hinges each include a first pair of teeth 264a, 264b and a second pair of teeth 264c, 264d. The first and second pairs of teeth 264a-d are arranged to engage with the first pair of gaskets 238a, 238c and the second pair of gaskets 238b, 238d respectively.

The first pair of gaskets 238a, 238c are located in between the first pair of teeth 264a 264b such that a first of the first pair of teeth 264a engages with a first of the first pair of gaskets 238a, and a second of the first pair of teeth 264b engages with a second of the first pair of gaskets 238c. The second pair of gaskets 238b, 238d are located in between the second pair of teeth 264c, 264d such that a first of the second pair of teeth 264c engages with a first of the second pair of gaskets 238b, and a second of the second pair of teeth 264d engages with a second of the second pair of gaskets 238d. The first and second teeth 264a-d therefore restrict movement of the first and second pair of gaskets 238a-d and help to improve the seal formed by the first and second pairs of gaskets 238a-d. It shall be appreciated that in alternative embodiments, the first section 240a may be omitted, or additional sections may be included. Any combination or arrangement of sections may be used to form the body.

Although the teachings have been described above with reference to one or more preferred embodiments, it will be appreciated that various changes or modifications may be made without departing from the scope as defined in the appended claims.

Claims

Claims 1. A dam for fitting to a door threshold or head rail of a door assembly comprising a first door leaf, the threshold or head rail having a channel defining a longitudinal axis, opposing first and second side walls and an intermediate wall extending between the first and second side walls, the dam comprising: a body configured to locate in the channel of the door threshold or rail; wherein the body is configured to at least partially obstruct a fluid flow path formed between the channel and a lip edge of each of the first and second side walls; wherein the body comprises a fixing arrangement configured to engage with the channel of the door threshold; wherein the body comprises a conforming arrangement configured to bias the body against the first and second side walls of the channel; and a first sealing surface configured form a seal at least with the first door leaf when the first door leaf is in a closed position, wherein the first sealing surface extends at least partially in a direction perpendicular to the longitudinal axis of the channel.
2. The dam according to claim 1, wherein the fixing arrangement comprises at least one guide configured to engage with a corresponding formation of the channel, and wherein the conforming arrangement is configured to bias the at least one guide into engagement with the first and/or second side wall of the channel.
3. The dam according to claim 2, wherein the at least one guide comprises a first guide located on an exterior side of the body configured to engage with a first corresponding formation on the first side wall of the channel, and a second guide located on an interior side of the body configured to engage with a second corresponding formation on the second side wall of the channel.
4. The dam according to any preceding claim, wherein the conforming arrangement is a wedging arrangement, and wherein the wedging arrangement is configured to engage with the first and second side walls of the channel.
5. The dam according to claim 4, wherein the body comprises a first section and a second section forming the wedging arrangement, and wherein the first and second sections are configured to exert a force on the first and second side walls of the channel, optionally wherein the first section is of substantially the same configuration to the second section.
6. The dam according to claim 5, wherein when the first section of the body and the second section of the body are in an assembled state, the body is substantially rectangular and wherein the first section is configured to engage with the first side wall of the channel and wherein the second section is configured to engage with the second side wall, optionally wherein the first and second sections meet at an edge which is configured to be angled relative to the longitudinal axis of the channel.
7. The dam according to any one of claims 1 to claim 4, wherein the body is formed from a second section including the first sealing surface, and a first section including the fixing arrangement, and wherein the first section is configured to provide structural support to the second section.
8. The dam according to claim 7, wherein the first section is manufactured from a substantially rigid material, and wherein the second section is manufactured from a substantially resilient material.
9. The dam according to any preceding claim, wherein a height of the dam in a direction perpendicular to the longitudinal axis of the channel is adjustable.
10. The dam according to claim 9, further comprising a packer secured to the dam and configured to locate between the intermediate wall of the channel and the dam, wherein the packer is configured to raise the door threshold a predetermined height from the intermediate wall of the channel, optionally wherein the packer is releasably secured to the dam.
11. The dam according to claim 10, wherein the packer is injection moulded with at least a portion of the body.
12. The dam according to claim 10 or claim 11, wherein the packer includes at least one engagement formation, and wherein the engagement formation is configured to engage with the body to releasably secure the packer to the body.
13. The dam according to any preceding claim, wherein the first sealing surface is configured to extend from the first side wall of the channel to the second side wall of the channel.
14. The dam according to any preceding claim, wherein the first sealing surface is formed from a resilient material.
15. The dam according to claim 14, wherein the first sealing surface comprises at least one bubble seal or a gasket e.g. a flipper gasket.
16. The dam according to claim 15, wherein the at least one flipper gasket comprises a first flipper gasket and a second flipper gasket located adjacent the first flipper gasket, and wherein the first flipper gaskets are located at a first end of the body.
17. The dam according to claim 15 or claim 16, wherein the conforming arrangement is the first and/or second flipper gasket, and wherein the flipper gasket is configured to bias the second section of the body against the first and second side walls of the channel.
18. The dam according to any preceding claim, further comprising a second sealing surface, optionally wherein the second sealing surface is of substantially the same configuration to the first sealing surface.
19. The dam according to claim 18, wherein the first sealing surface is located at a first end of the body and wherein the second sealing surface is located at a second end of the body opposing the first end of the body, optionally wherein the fixing arrangement is at least partially located in between the first and second sealing surfaces.
20. The dam according to any preceding claim, wherein the fixing arrangement comprises at least one bore located on the body, and wherein the at least one bore is configured to receive a fixing.
21. The dam according to claim 20, wherein the at least one bore includes a first bore configured to receive a first fixing, and a second bore configured to receive a second fixing, and wherein the first and second bores are configured to extend in a direction perpendicular to the longitudinal axis of the channel.
22. A door assembly for a fenestration unit, the door assembly comprising: a threshold and/or a head rail comprising a channel defining a longitudinal axis, opposing first and second side walls and an intermediate wall; at least one door leaf having an open position and a closed position; and a dam according to any preceding claim fitted within the channel of the threshold or the channel of the head rail, wherein the dam is configured to engage with the door leaf when the door is in the closed position.
23. The door assembly according to claim 22, wherein the channel comprises a corresponding formation configured to receive the fixing arrangement.
24. The door assembly according to claim 22 or claim 23, wherein the threshold comprises a thermal break located between an interior and an exterior side of the threshold, and wherein the dam is located between the thermal break and the door leaf.
25. The door assembly of any one of claim 22 to claim 24, further comprising a second door leaf, wherein the first sealing surface is configured to deform and form a seal with the second door leaf, further comprising a door interlock configured to create a seal between the first and second door leaves, and wherein the dam is located between the door interlock and the channel of the threshold or the head rail.