GB2237317A - Panel assembly for louvred door - Google Patents

Abstract

A panel assembly for use as a louvred door or shutter comprises first and second U-shaped channel members as side rails connected to top and bottom transom members to form a rigid frame. The frame is occupied by a louvre assembly in the form of one of more linking members serving to link the channel members. Each linking member comprises louvre batons 20 received as a sliding fit in apertures 30, 30' 30'' in a side portion of the linking member which may be a flat strip or a U-shaped channel facing away from the louvre baton. The side portions of the linking members are slidingly received in the open mouth of the channel members of the side rails so closing the open mouths of the channel members and forming closed hollow box section side rails therewith. Panel assemblies can be constructed substantially entirely from extruded plastics materials which can resemble wooden louvre panels on both faces. <IMAGE>

Description

PANEL ASSEMBLIES The present invention relates to panel assemblies such as louvred panels intended for use as doors or as functional or decorative shutters for windows.

Whilst louvred panels are usually sold made up and ready for use, there are advantages in panels so constructed that they can be sold in kit form for on-site construction. The advantges of providing plastics panel assemblies in component form which can be easily trimmed to provide an assembled door or shutter of appropriate size have been realised for a number of years. The modular construction of shutters of this type means that fewer units are required to be stored at wholesale and retail outlets to meet the wide range of window sizes for which the shutters are purchased and each kit requires less storage space than a made up panel. Simple modular construction also have the advantage that an unskilled worker can assemble the shutter without the use of specialised tools or fixings.The construction of the shutter assemblies from W-protected plastics material means that the shutters have a greatly extended ife and enhanced visual appearance compared to shutters of wooden or metal construction when subjected to the elements for long periods of time.

Adjustable length plastics shutters are known from US 4765110 which discloses a plastics shutter assembly comprising moulded side runners and panels which slot into the opposed runners. The panels and side runners are fixed together by the use of upper and lower end panels slotted into the side runners and secured with pins. The object of US 4765110 was to eliminate the fading and structural deterioration at cut edges caused by W exposure by constructing the end rails and mullion pieces to overlap the potential cutting sites at the edges of the side rails and ends of the shutter panels.

The teaching of US 4251966 is similar to that of US 4765110 but teaches the provision of extruded plastics side members with moulded plastics panels.

These known panels do not present on both faces an appearance similar to that of a conventional wooden louvred panel.

The present invention provides a panel assembly comprising first and second channel members disposed parallel to one another, a pair of transom members, each said transom member being slidingly located in and fixed to extend between a respective pair of ends of said channel members, said transom members forming with said channel members a rigid frame, and at least one linking member occupying said frame and linking said first and second channel members to one another, wherein the or each said linking member has a pair of opposed side portions longitudinally slidably located with said first and second channel members by locating formations on portions of the opposed side walls of each of the first and second channel members, the location of said linking member side portions with their respective locating formations serving to close the mouths of said first and second channel members so as to form therewith a pair of closed hollow box section side rails for said frame.

The channel members may be generally U-shaped in cross-section having a base wall disposed transversely to first and second side walls.

The locating formations of the channel members may comprise at least one longitudinally extending groove and/or at least one longitudinally extending ridge.

At least one of either the first or the second channel members may have locating formations which face one another and are situated on internal faces of the opposed side wall portions.

The locating formations may be grooves of generally rectrangular (e.g. square-shaped) cross-section.

The locating formations may be ridges which are undercut on at least one side.

Thus the locating formations of said first and second channel-members may be in each case an inwardly directed ridge or rib extending longitudinally on the interior surface of each of the side walls of the channel member.

The ridge or rib may be undercut on one or both edges. The depth of the ridge or rib may be similar to that of the side wall itself, so that the thickness of the portions of the walls including the ridges or ribs is about twice the thickness of the remaining wall portions. The ribs or ridges may be formed at or adjacent to the free edges of the side walls of the channel members.

The first and second channel members may have locating formations for the linking members which comprise a pair of opposed longitudinally extending grooves and locating means for the transom members which comprise a pair of opposed longitudinally extending ridges or ribs. The grooves may be square in cross-section and the ridges or ribs may be undercut on at least one side, i.e. that which faces inwards away from the channel mouth.

The linking member has side portions which may comprise first and second channel members disposed parallel to one another and connected by at least one louvre baton.

The said first and second channel members of the linking member may be generally U-shaped in cross-section and the open portions of these channel members may face outwards away from one another, the louvre baton or batons connecting between the base portions of the channel members.

The said first and second channel members of the linking member may have a first (base) wall disposed transversely to second and third (side) walls.

The said first wall of the first and second channel members of the linking member preferably has at least one slot to slidably locate a louvre baton. The length of the channel members of each linking member together with the number of louvre baton slots per unit length and the angle at which the louvre batons are held may be chosen as desired. Consequently there are many combinations possible for louvre angle and number of louvre batons within the scope of the present invention. The batons are preferably slidably located between the said first and second channel members of the linking member which permits easy assembly and their easy replacement if they become damaged or broken. The width of the shutter assembly can also be adjusted before assembly by trimming the length of the louvre batons and the transom members.

The first and second channel members of the linking member may have locating formations which may be longitudinally extending recesses on the opposed side walls. The recesses can be undercut on the external surface of the opposed side walls so that they co-operate with respective complementary-shaped undercut ribs on said first and second channel members.

The locating formations of the linking member and the locating formations of said first and second channel members of the assembly then co-operate in use to hold the linking member and each channel member together such that relative movement between the sides of the linking member and the channel members is restricted to sliding in a longitudinal direction. The use of undercut ribs on the channel members of the assembly locating in undercut grooves or recesses in the linking member or members prevents the lips of the channel members of the assembly pulling away from the inserted linking member or members in response to twisting forces.

The side portions of the linking members may be longitudinally extending strips whose sides slidably locate with said locating formations of the first and second channel members of the panel assembly.

Where the locating formations are grooves, they may simply receive the edges of said strips. Where the locating formations are ridges, the side faces of the strips may have locating grooves to receive such ridges.

The side portions may have at least one slot therein locating a louvre baton between said side portions.

The transom members may be generally hollow box sections for location in between and transversely to said box sections formed by said first and second channel members and said linking members.

Preferably the transom members each further comprise at least one locating means for securing the end of the transom member in the respective channel member of the panel assembly.

Optionally, each said locating means has a first portion received and retained in the interior of a main body portion of said transom member and a second portion protruding from the main body of the transom member and having locating formations thereon engaged with complementary locating formations on internal surfaces of the side walls of the respective channel member of the panel assembly.

The locating means may be a rectangular sleeve inserted transversely into an open end of a said transom member.

The locating means may be fixed to the transom member by an adhesive.

Said first and second transom members may each comprise as a main body portion a transversely extending (with respect to the channel members) first sleeve, generally rectangular in cross-section, and second and third sleeves (acting as locating means) longitudinally extending with respect to the channel members and generally rectangular in cross-section, adapted for insertion in use into the open ends of said first sleeve. The insertion of the second and third sleeves in first sleeve should preferably be a snug or tight fit and, optionally in conjunction with the use of a suitable adhesive to secure the second and third sleeves to the first sleeve, a permanent rigid structure may be provided to complete the rigid frame which encloses the linking members and prevents their movement relative to the first and second channel members.

Side wall portions of the transom member, preferably side wall portions of the said second and third sleeves of the transom member or other linking means, may have grooves therein to receive ridges or ribs of the channel members of the assembly. Such grooves preferably extend longitudinally along opposite side walls of the second and third sleeves. They are preferably undercut to match undercut ribs on the channel members of the panel assembly.

The transom members at the top and bottom complete the rigid frame which holds the linking members, e.g. louvred panels, in place. End caps may be provided for closing the ends of the channel members.

Alternatively, rather than the locating means being fixed by adhesive in the transom member, the degree of insertion of said locating means in the interior of said transom member main body may be governed by the interaction of a cam member movable in the locating means and an abutment associated with the main body of the transom member against which abutment said cam member bears.

The cam member may be a wedge movable transversely to the transom member by screw adjustment means in the locating means, and the abutment may be the wall of the bore of a tubular member receiving said wedge and secured to a respective end of said transom member main body.

Each transom member may further comprise an internal support web and the abutment of each said locating means may be attached to said web.

The assembly preferably comprises end caps which cover the end portions of said first and second channel members.

The invention includes a kit of components for the assembly of a panel assembly as described above.

The invention also includes a panel assembly, e.g. in the form of a door, shutter or panel, assembled from a kit of parts as herein before described.

All the components of the panel assembly are preferably made from plastics material which confers on the assemblies enhanced longevity in terms of appearance and structure compared to assemblies made from wood or metal.

Advantageously, many if not all the components of the assembly may be manufactured by extrusion. The channel members, louvre batons, linking member channel members or louvre supporting strips, transom members and transom member end sleeves may all be particularly suited to manufacture by extrusion.

The invention will be illustrated by the following description of preferred embodiments with reference to the accompanying drawings in which: Figure 1 shows the end portion of a generally U-shaped channel member with locating ribs; Figure 2 shows a generally U-shaped channel member component of a linking member with locating recesses and part of a louvre baton; Figure 3 shows a transom member locating means in the form of an end sleeve with locating recesses; Figure 4 shows an end portion of a transom member with an end sleeve inserted transversely into the sleeve constituting the main body of the transom member; Figure 5 shows the end of a wooden block to be inserted into a channel member to provide an attachment point for mountings and hinges; Figure 6 shows an end cap used to cover the open ends of the transom member end sleeves and the channel member of Figure 1;; Figure 7 shows part of a first alternative form of side portion forming part of a linking member; Figure 8 shows part of a second alternative form of side portion forming part of a linking member; Figure 9 is an end elevation of a side portion as illustrated in Figure 7 or Figure 8; Figure 10 is an end elevation of an alternative type of channel member suitable for use with the linking member side portions shown in Figures 7 to 9; Figure 11 is an end elevation of the main body of an alternative form of transom member; Figure 12 shows a longitudinal section through an alternative form of locating means for use with the transom member main body of Figure 11; Figure 13 comprises end elevations and a longitudinal section of an abutment member for use with the locating means of Figure 12;; Figure 14 comprises an end elevation and a longtiudinal section through a wedge for use with the locating means of Figure 12 and the abutment member of Figure 13; Figure 15 is a longitudinal section taken through the end portion of a transom member assembled from the components shown in Figures 11 to 14; Figure 16 is a transverse section taken along line XVI-XVI of Figure 15; Figure 17 comprises side and end elevations of the locating member illustrated in Figure 12.

Figure 1 shows the end portion of a channel member 2 for use in a first embodiment of the invention. The channel member has side walls 4, 6 and 8 which define a longitudinally extending channel which is generally Ushaped in cross-section. The channel space 10 and the gap 12 between the side walls 6 and 8 receive and locate in use other components of the assembly. On the inside of side walls 6 and 8 at their free edges the side walls are thickened to form ribs 14, 14' which extend along the length of the channel member. The ribs 14, 14' are undercut along one edge so that triangular section tongues 16, 16' are formed. The tongues 16, 16' form part of the locating formations used in the invention. The thickness of the ribs 14, 14' is generally twice the thickness of the walls 4, 6 and 8.

Figure 2 shows a short channel member 18 and part of a louvre baton 20 forming part of a linking member. The short channel member 18 is formed form a base wall 22 and transversely disposed side walls 24 and 26 which extend longitudinally to form a generally U-shaped channel. The side walls 24 and 26 include undercut recesses 28, 28' on their external surfaces which co-operate with the ribs 14, 14' of the channel member shown in Figure 1. The base wall 22 has slots 30, 30', 30" which can each slidably receive the end of a louvre baton 20.

The or each linking member consists of two such short channel members 18 as the side portions of the linking member joined by three louvred batons slid into the slots 30, 30', 30".

Figure 3 shows a transom member end sleeve 32 of generally rectangular cross-section which has recesses 34, 34' on the external faces of opposed side walls 36, 38.

One side wall of each of the recesses 34, 34' is undercut with respect to the external face of respective side walls 36, 38 to produce longitudinally extending triangular section groove structures 40, 40'. The recesses 34, 34' slidably locate the undercut ribs 14, 14' of the channel member of Figure 1.

Figure 4 shows one end of a transom member 42 with the end sleeve 32 of Figure 3 inserted into one end of a transom member main body 44 in the form of a rectangular cross-section sleeve. The end of the main body 44 lies flush with the start of the wall recesses 34, 34' opposite to the tongues 40, 40'. A similar end sleeve 32 is fitted into the other end of the main body 42. The end sleeves are a snug fit and are fixed in position in the ends of the transom member by adhesive.

The components shown in Figures 1 to 4 are conveniently made in plastics by extrusion.

Figure 5 shows the end of a block of wood 52 which optionally can be inserted into the channel space 10 of the channel member in Figure 1 to provide a secure fixing point for mounting means such as hinges.

Figure 6 shows a snap-fit end cap 54 which is used to cover the gap 46 in the transom member in Figure 4 and the end of the channel member of Figure 1. The end cap has retaining lugs 56, 58. Lug 56 fits flush against the interior of wall 4 in Figure 1 and lug 58 fits flush against the interior of the transom sleeve upper wall 50 in Figure 4.

Lug 56 has ridges which when the cap is in place are firmly pressed to the inside wall 4 of the channel member 2. This helps to ensure that a firm snap fit location of the end cap takes place in the open ends of the channel member.

A typical kit of plastics components selected from those illustrated in Figures 1 to 6 to permit the assembly of a louvred panel, door or shutter may comprise: (a) two channel members one of which is shown in part by Figure 1; (b) four linking members, one of which is shown in part by Figure 2, each having a pair of linking member channel members 18, and three louvre batons 20; (c) three transom members, one of which is shown in part by Figure 4, each having a transom sleeve 32 shown in Figure 3; (d) four end caps 54, as shown in Figure 6.

The louvred panel door or shutter is assembled by slidably inserting a base transom member in between the two channel members such that the base of the transom member lies flush with the end of the channel members and links the channel members together.

First and second linking members are assembled from their component louvre batons and channel members and are then slidably inserted in between the channel members already held in position by the lower transom member. A middle transom member is then slidably inserted on top of the first and second linking members in between the channel members. Linking members 3, 4 are then slidably inserted in between the channel members. The upper transom member is then slidably inserted on top and the channel members trimmed if necessary so that the top of the upper transom member lies flush with the end of the channel members. The transom members may be secured to the channel members by adhesive.At each side of the upper and lower ends of the rigid frame now produced, an end cap is fitted in position and retained by the action of snap-fit lugs in order to cover the exposed ends of the transom end sleeves and the ends of the channel members.

An alternative form of panel assembly may be constructed form the components shown in Figures 7 to 17.

Figure 7 is an illustration of part of a member constituting the side portion of an alternative linking member. Side portion 62 is a generally flat strip with regularly spaced slots 30, 30' for the reception of the ends of louvre batons 20. These slots are positioned so that the louvre batons are held at an angle to the longitudinal axis of the side portion. The angle indicated x is 260 and it has been found that this is most suitable for panel assemblies intended for use as shutters.

Figure 8 is an illustration of a similar member for constituting a side portion of linking member in which the slots 30, 30', 30" are arranged so that the louvre batons are held at an angle y in relation to the longitudinal axis of the side member. Angle y is 390 and it has been found that panel assemblies comprising these linking members are suitably used as doors.

Figure 10 is an end elevation of an alternative channel member 66 which is substantially the same as the channel member 2 shown in Figure 1 except that at the mouth of the channel side walls 6 and 8 are provided with extensions 68, 68' along the length thereof. Opposed portions of the extensions 68, 68' are so formed to provide a longitudinally extending pair of grooves 80 which are square or rectangular shaped in cross-section. These grooves 80 serve to slidably locate the side members illustrated in Figures 7 to 9. The slidable location of a side member into grooves 80 will convert the channel member into a closed box section. Channel member 66 is further provided with a longitudinally extending integral support wall 82 which lies adjacent to and parallel with base wall 4. Undercut ribs 14 are provided on the inside surfaces of opposed side walls 6 and 8.These undercut ribs 14, 14' can slidably locate with the recesses 34, 34' of a transom member end sleeve 32. The ribs 14, 14' may also be used to slidably locate a transom member locating assembly which will be described below.

Figures 11 to 17 concern a transom member locating means in the form of an assembly generally shown as 83 in Figure 16. The assembly provides an alternative way of linking the ends of the main bodies of the transom members to respective first and second channel members. The transom member locating assembly is designed for use with a modified transom member as shown in Figure 11. Figure 11 shows such a modified transom member main body 84 which has internal support web 86 and a screw hole 88 formed in the web 86. The internal support web 86 and screw hole 88 extend longitudinally throughout the length of the transom member main body. Figure 12 shows a longitudinal section through a locating member 90. The locating member 90 can slidably locate in the open end of transom member 84.

Locating member 90 has a passage 92 therethrough which is generally square-shaped in cross-section at its lower end in Figure 12 and over most of its length. All its other end passage 92 narrows and forms a tubular screw hole 95.

Locating member 90 also has tubular housing 96 transversely disposed to channel 92 for receiving a collar 97 shown in Figure 13.

The collar 97 is generally cylindrical with a tapered square section passage 98 running through the collar 97 perpendicular to the longitudinal axis thereof. At one end of the collar is an axial screw hole 100 and at the other end is an axial screw access hole 102 communicating with screw hole 100.

Figure 14 shows a tapered wedge 104 which is generally rectangular in section. Wedge 104 has a screw hole 106 and a screw clearance hole 108 running longitudinally therethrough.

Figure 15 shows in longitudinal section the arrangement of the transom member main body 84, locating member 90 and collar 97 which form a partially completed transom member locating assembly. Collar 97 is attached to the internal support web 86 of transom member main body 84 by means of screw 108. Locating member 90 is sleeved inside the end of transom member 84 and over collar 97.

The locating member is now slidably located within the end of the transom member main body 84. The locating member is fixed in place by means of wedge 104 which is inserted upwards through passage 92 of locating member 90 and tapered passage 98 of collar 97. The tapered surfaces of the wedge 104 and the tapered passage of the collar 97 cooperate to define the degree of insertion of the locating member 90 into the main body 84. The wedge is adjustable in position by means of screw 110 which is inserted through the screw hole 95 in the top 94 of locating member 90 and through the screw hole 106 in the top of wedge 104.

Figure 16 shows a transverse section along line XVI XVI of Figure 15 through a completed transom member locating assembly showing all the components.

Figure 17 shows the means by which locating member 90 of the transom member locating assembly can slidably locate within the end of channel members 84. Opposed portions 118, 118' of the side walls 112, 114 are thickened and then undercut to form longitudinally extending ribs. These ribs can slidably locate with the longitudinally extending ribs of channel members. Side walls 112, 114 are each provided with transversely extending slots 120, 120'. The slots enable the locating member 90 to slidably insert into the end of transom member 84 without obstruction from internal support web 86.

A kit of plastics components selected from the components illustrated in Figures 1 to 17 can be used to assemble a louvred panel door shutter. The components may comprise:- a) two channel members one of which is shown in end view in Figure 10; b) four linking members each having a pair of side portions 62 or 64 shown in Figures 7 or 8 and three louvre batons 20; c) three transom member main bodies one of which is shown in end elevation in Figure 11; d) four transom member locating assemblies one of which is shown in transverse section in Figures 16 each comprising a locating member 90, collar 97, wedge 104 and screws 108, 110; e) four end caps 54 as shown in Figure 6.

The louvred panel, door or shutter is assembled as described above for the previous kit except that each transom member locating assembly is constructed as follows.

Collar 97 is attached to internal support web 86 at the end of transom member main body 84 by means of screw 108.

Locating member 90 is then sleeved within the end of transom member main body 84 so that housing 96 slides over collar 97. The position of the locating member 90 within the end of transom member 84 is adjusted so that wedge 104 can be inserted through both passage 92 of locating member 90 and passage 98 of collar 97. The wedge is then pushed sufficiently home so that the tapered end lies adjacent to screw hole 96 of locating member 90. Screw 110 is then used to secure wedge 104 in passage 92 thereby pinning locating member 90 to collar 97.

Once each transom member main body has been fitted with the transom member locating assemblies then a louvred panel door or shutter can be assembled in the same manner as described for a panel assembly which has transom members whose ends are fitted with transom member end sleeves except that the transom members are fixed in position on the channel members by tightening screws 110 to draw up the wedge 104 and clamp the assembly.

Although the invention has been described with reference to the specfic characteristics of the illustrated embodiment, many variations and modifications are possible within the scope of the invention.

For instance, the ribs 14, 14' may be formed on the channel members of the linking member and on the end sleeves of the transom members and the complimentary recesses may be formed on the channel members of the assembly.

The channel members of the linking members may fit outside the channel members of the assembly instead of inside.

The ribs 14, 14' may be undercut on each edge rather than on one edge as illustrated and the grooves 34, 34' may be undercut to match.

Instead of louvre batons one may have plain panels located in grooves in the walls 22 of the channel members 18 or strips 62, 64.

Claims (23)

1. A panel assembly comprising first and second channel members disposed parallel to one another, a pair of transom members, each said transom member being slidingly located in and fixed to extend between a respective pair of ends of said channel members, said transom members forming with said channel members a rigid frame, and at least one linking member occupying said frame and linking said first and second channel members to one another, wherein the or each said linking member has a pair of opposed side portions longitudinally slidably located with first and second channel members by locating formations on portions of the opposed side walls of each of the first and second channel members, the location of said linking member side portions with their respective locating formations serving to close the mouths of said first and second channel members so as to form therewith a pair of closed hollow box section side rails for said frame.

2. An assembly as claimed in Claim 1, wherein said locating formations on said side walls of said channel members each comprise at least one longitudinally extending groove and/or at least one longitudinally extending ridge.

3. An assembly as claimed in Claim 2, wherein at least one of said first or said second channel members has locating formations which face one another and are situated on internal faces of said opposed side wall portions.

4. An assembly as claimed in Claim 3, wherein said locating formations are grooves of generally rectangular cross-section.

5. An assembly as claimed in Claim 3, wherein locating formations are ridges which are undercut on at least one side.

6. An assembly as claimed in any preceding Claim, wherein the side portions of each said linking member comprise first and second channel members disposed parallel to one another and connected by at least one louvre baton running transverse to said channel members of the linking member.

7. An assembly as claimed in Claim 6, wherein said first and second channel members of the linking member are generally U-shaped and the open portions of these members face outwards away from one another, the louvre batons connecting between the base portions of the channel members of the linking members.

8. An assembly as claimed in Claim 7 wherein said first and second channel members of the linking member each have at least one slot slidably locating a said louvre baton.

9. An assembly as claimed in Claim 8, wherein said first and second channel members of the linking member have locating formations which are longitudinally extending undercut recesses on opposed side walls of the channel members of the linking member, so which co-operate with respective complimentary ones of the locating formations on said first and second channel members of the panel assembly in the form of undercut ridges.

10. An assembly as claimed in any one of Claims 1 to 4, wherein the side portions of said linking members are longitudinally extending strips whose sides slidably locate with said locating formations of the channel members of the panel assembly.

11. An assembly as claimed in Claim 10, wherein said side portions have at least one slot locating a louvre baton between said side portions.

12. An assembly as claimed in any preceding claim, wherein said transom members each comprise a generally hollow box section located in between and transverse to said first and second channel members of the panel assembly.

13. An assembly as claimed in Claim 12, wherein said transom members each further comprise at least one locating means for securing the transom member in the channel member of the panel assembly.

14. An assembly as claimed in Claim 13, wherein each said locating means has a first portion received and retained in the interior of a main body portion of said transom member and a second portion protruding from the main body of the transom member and having locating formations thereon engaged with complementary locating formations on internal surfaces of the side walls of the respective channel member of the panel assembly.

15. An assembly as claimed in Claim 14, wherein each said locating means is a rectangular sleeve inserted transversely into a respective open end of said transom member.

16. An assembly as claimed in Claim 14 or Claim 15, wherein the said locating means is fixed in said transom member by an adhesive.

17. An assembly as claimed in Claim 14, wherein the degree of insertion of said locating means in the interior of said transom member is governed by the interaction of a cam member movable in the locating means and an abutment associated with the main body of the transom member against which abutment said cam member bears.

18. An assembly as claimed in Claim 17, wherein the cam member is a wedge movable transversely to the transom member by screw adjustment means in the locating means, and the abutment is the wall of the bore of a tubular member receiving said wedge and secured to a respective end of said transom member main body.

19. An assembly as claimed in Claim 17 or Claim 18, wherein said transom members each further comprise an internal support web and the abutment of each said locating means is attached to said web.

20. An assembly as claimed in any preceding claim, further comprising end caps which cover the end portions of said first and second channel members of the panel assembly.

21. A panel assembly substantially as hereinbefore described with reference and as illustrated in Figures 1 to 6 or 7 to 17 of the accompanying drawings.

22. A kit of parts for assembly to form a panel assembly as claimed in any one of Claims 1 to 21.

23. A door, shutter or panel assembled from a kit of parts as claimed in Claim 22.