EP0363365B1 - Frontal element for furniture - Google Patents

Abstract

Frontal element for furniture, such as a door, comprising an outer and inner frame, into which may be fitted an interchangeable panel (32, 73, 74, 76). The struts which form the frame (14, 18, 24, 28) are fully mitred and, fundamentally, held together simply by the securing elements which connect, without the help of screws, the outer struts of the frame (14, 18). In order to achieve a pleasing appearance, the grooves in the outer and inner frame (62, 64, 70, 72) which take the inner frame or panel (32, 73, 74, 76) are disposed in planes at a distance from each other.

Description

The invention relates to a furniture front element with outer and inner frames which can be used and exchanged therein, and interchangeable fillings which can be used therein, the outer frame consisting of sections of profile strips with a groove running in the longitudinal direction.

A corresponding door can be found in EP-A-0 079 873. The legs of the outer and inner frames butt each other. The inner frame is so loosely arranged in the outer frame that the individual frame legs can be removed independently of one another when the outer frame is closed. For this purpose, one leg of the outer frame must have a continuous slot. From EP-A-0 148 041 a door with cross legs extending between two vertically extending legs is known, which are connected in a butt joint. There is no provision for easily replaceable fillings or inner frames. A furniture front element for kitchens and cupboard furniture in particular can be found in FR-A-24 94 573, in which worn or unmodern front doors have to be replaced with new ones. The furniture front elements are therefore intended for the renovation of furniture in which only the visible front parts are replaced. In doing so, the interchangeable arrangement of the filling created the opportunity to transform the look. For this purpose, each filling is preferably composed of two plates lying one above the other, which comprise a total of four different decorative sides.

The fact that the legs forming the frame are cut off from profile strips available by the meter means that a furniture front element of the desired size can be produced without great effort. The profile strips themselves preferably consist of a core made of MDF, which is plastic-coated.

The object of the present invention is to develop a furniture front element of the type mentioned at the outset for the refurbishment of furniture, in particular kitchen furniture and cupboard furniture, in such a way that "transformation" with the parts forming the furniture front element is possible by simple measures. From the quality of the end product, the manufacturing should be considered industrial, but it should be possible to easily adapt it to different sizes and / or desired decor effects. An exchange or change of individual elements and their cohesion should be carried out without any problems, in particular without different shapes of the individual parts being required.

The object is essentially achieved in that the legs of the outer and inner frame each form a real miter and are releasably fixed by the forces caused in the legs of the outer frame connecting elements and that the circumferential inner groove of the outer frame runs in a plane that is arranged offset to the plane in which the inner groove of the inner frame runs. Through the proposal according to the invention, the exterior of a known front element intended for the renovation of furniture can be "transformed" by simple means that, in addition to changing the filling to achieve different decorative effects, the inner frame detachably inserted in the outer frame can also be replaced without it different designs of individual frame legs for a "loose" arrangement of the inner frame with filling is required, which may result in an undesirable and noisy movement of the parts.

The course of the grooves in different planes creates the possibility of offering the furniture front element according to the invention in the form of a cassette, i.e. the filling is displaced forward with respect to the outer frame. This has the further advantage that there appears to be a larger cross section of the front element, making it appear heavier, "more massive".

According to one embodiment of the invention, the visible inner or outer surfaces of the legs of the inner frame are optionally part of the outer front of the furniture front element. The inner and outer surface of the inner frame can be profiled differently and / or designed in color. As a result, the number of options for changing the exterior of the furniture front element is multiplied in comparison to the known furniture front elements for the renovation area. As a result, a mixed change and adaptation to existing color donors or the changing tastes of time can take place without renewing parts of the front element or as a unit.

In order to enable a problem-free exchange of the filling and / or the leg of the inner frame, it is proposed that the sections forming the legs of the inner frame essentially differ from those in the legs of the outer frame existing miter forces in a real miter joint. Irrespective of this, a connection of the nested frame legs can of course be used to fix the position. B. done by nails or pens. Nevertheless, guidance and mounting is essentially carried out by the outer frame. This means that only one leg of the outer frame with the leg of the inner frame releasably arranged in it has to be removed from the furniture front element in order to change the filling and / or the inner frame.

In order to ensure a tilt-free support of the legs of the inner frame in the circumferential groove of the outer frame, it is proposed that sections of the legs of the inner frame running in the inner groove of the outer frame rest at least in regions on the bottom surface of the inner groove. The region of the section facing the bottom surface can also be formed as a fillet, the edges of which lie against the bottom surface. This results in the advantage that unevenness in the area of the floor surface, in particular in the central area for plugging together the legs of the inner frame into those of the outer frame which do not lead to visible irregularities, since at least the areas of the walls of the inner groove in which the protruding into the inner groove Section of the legs of the inner frame is supported, are flat.

In order to ensure good guidance of the legs of the inner frame in the inner groove of the outer frame, the depth of the circumferential groove of the outer frame and / or of the inner frame can be chosen to be lower in the area of its inner boundary wall than in the area of the outer wall. This also has the advantage that the inner groove of a profile material to be coated can be lined without problems, with an overlapping of the coating material taking place in the groove bottom according to an independent proposal. This ensures that, except for the cut surfaces, the entire leg is tightly encased by the coating material, so that especially when using the furniture front element according to the invention in wet areas such as. B. in kitchens, penetration of moisture between the frame leg body and the layering can not take place.

If you want to choose the groove depth over the entire groove bottom without sacrificing the overlap of the coating material in the groove bottom area, it is proposed according to one embodiment that the width of the groove bottom is approximately twice as large as the groove depth. The width is preferably thirteen millimeters and the depth is six millimeters.

• a) Einbringen eines Abschnittes einer ersten Profilleiste mit in Längsrichtung verlaufender Nut in eine dem Abschnitt angepaßte Längsnut einer zweiten Profilleiste,
• b) lösbares gegen ein Verschieben gesichertes Verbinden der ersten und zweiten Profilleisten,
• c) Herstellen von (ersten und zweiten) Rahmenschenkeln durch Schneiden der verbundenen Profilleisten in echtem Gehrungsschnitt,
• d) Ausrichten auf und/oder Einpassung von Einrichtungen in den zweiten Profilleisten zu deren späteren zumindest teilweise lösbaren Verbindung,
• e) Ausrichtung und Verbinden eines oberen, unteren und eines ersten seitlichen zweiten Rahmenschenkels,
• f) Einbringen der aus mehreren plattenförmigen unterschiedliche Dekorwirkungen entfaltenden Elementen bestehenden Füllung in die Nut der zusammengesetzten ersten Rahmenschenkel,
• g) Verbinden der weiteren seitlichen eine Einheit bildenden ersten und zweiten Schenkel mit den zweiten oberen und unteren Schenkeln über Verbindungselemente.

A method for producing a furniture front element with a frame and replaceable filling, for producing a furniture front element according to claim 1, is characterized by the following method steps:

• a) introducing a section of a first profile strip with a longitudinally extending groove into a longitudinal groove of a second profile strip adapted to the section,
• b) detachable connection of the first and second profile strips secured against displacement,
• c) producing (first and second) frame legs by cutting the connected profiled strips in a real miter cut,
• d) aligning and / or fitting devices in the second profile strips for their later at least partially releasable connection,
• e) aligning and connecting an upper, lower and a first lateral second frame leg,
• f) introducing the filling consisting of several plate-shaped elements with different decorative effects into the groove of the assembled first frame legs,
• g) connecting the further lateral first and second legs forming a unit to the second upper and lower legs via connecting elements.

• h) daß vor dem Ausrichten und/oder Einpassen der Einrichtungen in den zweiten Profilleisten die ersten Profilleistenabschnitte von den zweiten Profilleistenabschnitten gelöst werden,
• i) daß erste in Längsrichtung der aus den zweiten Profilleisten gebildeten ( zweiten ) Rahmenschenkel verlaufende Bohrungen von den Schnittflächen der Profilleisten ausgehend eingebracht werden, wobei die Frontfläche der zweiten Profilleisten zur Normierung für die Bohrungen dient,
• k) daß zwei weitere Bohrungen von der Rückseite der zweiten Rahmenschenkel ausgehend eingebracht werden,
• l) daß die zwei weiteren Bohrungen die in Längsrichtung verlaufenden ersten Bohrungen schneiden und
• m) daß anschließend die aus den ersten Profilleisten gebildeten ersten Rahmenschenkel in die beim Schneiden zugeordnete Nut der zweiten Rahmenschenkel eingebracht werden.

After further training,

• h) that before aligning and / or fitting the devices in the second profile strips, the first profile strip sections are detached from the second profile strip sections,
• i) that first bores extending in the longitudinal direction of the (second) frame legs formed from the second profile strips are made starting from the cut surfaces of the profile strips, the front surface of the second profile strips serving for standardization of the bores,
• k) that two further holes are made starting from the back of the second frame legs,
• l) that the two further bores intersect the longitudinal bores and
• m) that the first frame legs formed from the first profile strips are then introduced into the groove of the second frame legs assigned during cutting.

The connection of the profile strips provided according to method step b) can take place in the region of one end, so that the connection, which is preferably made by tacking nails, is cut to length can't bother. In addition, there is the advantage of "one-sided" setting that when cutting the profile strips are always connected, but can be dismantled immediately after cutting, provided that the cutting is done from the unconnected end.

It should also be pointed out that process steps i) and k) can of course also be carried out in a different order. Furthermore, if necessary, only one hole can be drilled, provided that sufficient connection of the frame legs should already be ensured by connecting elements that are to be inserted into the mutually aligned holes.

Finally, it should be noted that before the filling is introduced, the entire frame can first be closed in order to connect the inner frame legs with the outer frame legs, for. B. to connect with tack nails. This ensures that when the filling is changed, the legs do not slip unintentionally.

With the method according to the invention, a furniture front element according to the invention can be produced, so to speak, in industrial production, with a problem-free orientation towards individual wishes. The alignment of the frame legs on the front surfaces as standard surfaces ensures that the visible surfaces of the legs merge flush into one another and the legs themselves meet completely in the miter and do not form any gaps. The fact that the legs of the inner frame have been trimmed together with the legs of the outer frame ensures that the inner frame is also assembled with a perfect fit, additional connecting elements between the individual legs being unnecessary, since the holding together by the closure elements connecting the legs of the outer frame he follows. As mentioned, the profile strips releasably connected to each other for cutting are preferably in the area of e.g. B. stitched together, which is not required for the furniture front element, so that the connection does not have to be broken by tools such as tools.

To ensure that moisture in the area of the cut surfaces can not penetrate the frame legs, these are z. B. sealed with a glue. Finally, it is provided that in each case one end section of an angular dowel is inserted into a slot of the housing of the eccentric angle fitting, which slot runs parallel to the frame plane, and is pulled towards it by rotating the housing, the section of the angled dowel located in the slot being flattened such that the Dowel is rotated in the slot. This results in a problem-free alignment of the legs with each other. When tightening the eccentric angle fittings, the first legs forming the inner frame can be aligned flush with one another with respect to the outer surface, in order to meet without gaps.

The invention is explained in more detail below with reference to preferred exemplary embodiments shown in the drawing.

• Fig. 1 eine Rückseite eines zusammengesetzten Möbelfrontelementes,
• Fig. 2 das Möbelfrontelement nach Fig. 1 mit zu entfernendem Schenkel,
• Fig. 3 das Möbelfrontelement nach Fig. 1 mit zu entfernender Füllung,
• Fig. 4 das Möbelfrontelement nach Fig. 1 mit zu entfernendem Innenrahmen,
• Fig. 5 eine Schnittdarstellung entlang der Linie V-V in Fig. 1,
• Fig. 6 eine Detaildarstellung von in einen Schenkel eines Außenrahmens eingesetztem Schenkel eines Innenrahmens,
• Fig. 7 eine Detaildarstellung eines Schenkels eines Außenrahmens im Schnitt,
• Fig. 8 Schnittdarstellung einer weitereh Ausführungsform eines Schenkels des Außenrahmens,
• Fig. 9 eine vergrößerte Detaildarstellung einer Verbindung von Rahmenschenkeln des Außenrahmens über einen Exzenter-Verbindungsbeschlag,
• Fig. 10 einen Winkeldübel gemäß Fig. 9 in Seiten- und Vorderansicht und
• Fig. 11 eine Prinzipdarstellung zur Herstellung von Rahmenschenkeln des Möbelfrontelementes nach Fig. 1.

Show it:

• 1 is a back of a composite furniture front element,
• 2 shows the furniture front element according to FIG. 1 with the leg to be removed,
• 3 shows the furniture front element according to FIG. 1 with the filling to be removed,
• 4 shows the furniture front element according to FIG. 1 with the inner frame to be removed,
• 5 is a sectional view taken along the line VV in Fig. 1,
• 6 shows a detailed illustration of an inner frame leg inserted into a leg of an outer frame,
• 7 is a detailed representation of a leg of an outer frame in section,
• 8 shows a sectional view of a further embodiment of a leg of the outer frame,
• 9 is an enlarged detail view of a connection of frame legs of the outer frame via an eccentric connection fitting,
• Fig. 10 is an angled plug according to FIG. 9 in side and front view and
• 11 is a schematic diagram for the production of frame legs of the furniture front element according to FIG. 1.

1 to 4, a composite furniture front element (10) is shown, which is assembled in Fig. 1 and can be dismantled according to FIGS. 2 to 4 by simple manipulations in order to "transform" its exterior. The furniture front element (10) consists essentially of one composed of the legs (12), (14), (16) and (18) Outer frame (20) and the inner frame (30) composed of the legs (22), (24), (26) and (28), in which a filling (32) is detachably arranged. The outer legs (12), (14), (16) and (18) are connected via eccentric connecting fittings described in more detail with reference to FIGS. 9 and 10, whereby at the same time the hold of the inner legs (22), (24), (26) and (28), which in turn are detachably arranged in the outer legs (12), (14), (16) and (18).

In order to connect the outer legs (12), (14), (16) and (18) to each other without screws, housings (34) and (36), which interact with angled plugs (38), are inserted into the bores of the rear side from unspecified holes to step. Each housing (34) and (36) thus has a slot running parallel to the frame plane, in which sections (40) and (42) of the angled dowels (38) can be inserted. By turning the housing (34) or (36), the anchors are now used for the housings. This can be seen in the fact that the slot is embedded in a housing wall (44) or (46) which extends eccentrically to the pivot point of the housing (34) or (36) itself. Since the angular dowel (38) covers the inner surface of the walls (44) and (46) with its end sections (48) and (50), the angular dowel must automatically move in the direction of the pivot points when the housings (34) and (36) are turned the housing can be pulled. This ensures a secure connection between the legs (12), (14) or (14), (16) or (16), (18) or (18), (12).

Furthermore, since the sections (40) and (42), which engage in the slots in the walls (44) and (46), are flattened, there is no possibility that the anchors (38) can be rotated to their longitudinal axis. As a result, the frame legs (12), (14), (16) and (18) are aligned and moved towards one another with respect to their front surface and "locked". Due to the forces caused by eccentric connecting fittings at the same time the inner legs (22), (24), (26), (28), which are detachably arranged in the outer legs (12), (14), (16) and (18), are aligned and fixed to one another without the need for additional connecting elements.

Various assembly states of the furniture front element according to the invention are now shown with the aid of FIGS. 2 to 4 in order to clarify that the exterior of the furniture front element (10) can be "transformed" with a few simple operations. Is the furniture front element (10) shown in Fig. 1 composed, the z. B. can be connected via pot hinges (52) and (54) to the body of a cabinet, so in the stage of FIG. 2, the outer leg (18) with the inner leg releasably arranged in this (28) from the frame to the to be able to remove reversible or replaceable filling (32), as already indicated in FIG. 3.

In order to additionally replace or turn the inner legs, they only need to be detached from the outer legs (12), (14), (16), (18), as is to be indicated with the inner leg (22) with reference to FIG. 4 . During this "disassembly", the furniture front element (10) is still connected to the body of a cabinet via the pot hinges (52) and (54), since the remaining outer legs (12), (14) and (16) have a supporting function. After the inner legs (22), (24), (26), (28) have been completely removed from the outer legs (12), (14), (16), (18), these can either be turned over and reinserted or others Inner legs are introduced into the outer legs (12), (14), (16), (18), in order to then insert another side of the filling (32) which has a different decorative effect. Then the leg (18) together with the inner leg (28) is connected to the outer legs (12) and (16) via the eccentric connecting fittings described in more detail in FIGS. 9 and 10. In addition, the individual legs are secured by plastic dowels (56) which are embedded in bores (58) and (60) of the outer legs (12), (14), (16) and (18).

In Fig. 5 is a sectional view along the line VV in Fig. 1 is shown in an enlarged view to more details of the outer frame (20) formed by the legs (12), (14), (16) and (18) and in to describe this removable inner frame (30) formed from the inner legs (22), (24), (26) and (28). Each leg (14), (18) represents a section of profile strips available in piece goods, which have a groove (62) or (64) in their longitudinal direction. The legs (12), (14), (16) and (18) are assigned to one another with respect to the groove (62), (64) such that a circumferential inner groove is formed into which the legs (22), (24 ), (26), (28) are interchangeable. For this purpose, the inner legs - in FIG. 5 the legs (24) and (28) - each have a section (66) or (68) adapted to the groove (62) or (64), the elements preferably being connected in a snug fit are. The inner legs (24) and (28) are also cut from profiled strips available by the meter and likewise have grooves (70) and (72) forming a circumferential inner groove, in which the filling (32) is arranged interchangeably. 5, the filling (32) consists of a total of three plates (73), (74) and (76) each with two different decorative sides.

It can be seen from FIG. 5 that the circumferential inner groove of the outer frame (20) comprising the grooves (62) and (64) extends in a different plane than the circumferential inner groove of the inner leg (30), which results in a cassette effect and the associated connection Depth effect of the furniture front element (10) results.

Details, in particular the design of the inner legs to be releasably inserted into the outer frame, can be found in FIG. 6. The leg of the outer frame has the same profile as in FIG. 5, so that the same reference number (18) is used. A section (78) of an inner leg (80) is now introduced into the groove (62), the region facing the bottom surface (82) of the groove (62) being designed as a groove (84). This has the advantage that unevenness in the base area (82) does not lead to tilting of the inner leg (80).

Furthermore, the leg (80) is designed as a so-called "reversible leg", ie both the outer surface (86) and the inner surface (88) (shown in dashed lines) can optionally be used as the visible outer surface of a furniture front element, so that each surface (86) and (88) have a different color and / or can be profiled differently. For this it is only necessary that the inner leg (80) is removed from the groove (62) and turned by 180 °. In order to achieve a cassette effect in this case as well, two grooves (90) and (92) can be provided in the inner leg (80), each of which runs offset to the section (78).

The flute formation (84) of the leg (80) is particularly important if, as mentioned, unevenness is present in the bottom region (82) of the leg (18). As can be seen in FIG. 7, these can be formed in that the leg (18), which e.g. consists of MDF material, is encased in a plastic film (94), the ends overlapping in the base area (82). The overlapped area is provided with the reference symbol (96). If the inner leg designed according to FIG. 6 is now brought into the groove (62), the overlap region (96) cannot lead to any hindrance, since it falls into the free space formed by the groove (84).

It should also be mentioned that the bottom area (82), that is to say the bottom of the groove, can be impregnated ("sealed") with the coating material before the sheathing, so that any gaps between the edges of the material cannot lead to moisture penetration.

8 shows a special embodiment of an outer frame leg (98) which is completely encased in a plastic film (not shown). So that the interior of the groove (100) intended for an inner leg (not shown) can also be completely lined, the groove depths in the region of the side walls (102) and (104) deviate from one another, so that the coating material provided with an adhesive when introduced into the groove (100) cannot come into contact with the opposing boundary walls (102) and (104). A corresponding design of the outer leg (18) results in structurally simple changes in the possibility of completely encasing the material with a film without the filling (32), not shown, being less guided from the front of the furniture front element. This ensures the height of the wall (104). If one wanted to dispense with the different groove depths while at the same time completely sheathing the leg (98), the groove depth to the width of the groove base would have to be chosen so that it is twice as large as that.

11 is intended to indicate, purely schematically, how the legs of the inner and outer frames are produced with a true miter cut. First of all, a profile strip (106) forming the outer legs is stitched together with a profile strip (108) forming the inner legs in an area (110) which cannot later be used as waste. This stitching together can e.g. B. done by brackets, shooting or the like. This ensures that the profile strips (106) and (108) cannot be moved against each other when cutting by means of a saw blade (112). After a miter cut has been made with the saw blade (112), the cut surface (114) is fixed to a stop (116), by means of which the length of a leg to be cut, which is not specified, is defined. Since the saw blade (112) has a clear assignment to the stop (116) and also the first cut (114) is clearly assigned to the saw blade (110) in order to achieve a real miter cut, it is always ensured that the legs cut according to the schematic diagram according to FIG. 11 have the desired length, by stitching together the profile strips (106) and (108) ensures that when assembling the inner and outer legs there is an accuracy that guarantees a precisely fitting miter joint in a composite furniture front element. Since several legs are normally cut off from the profiled strips provided by the meter and there is always one end section as waste, it is possible to staple them together in this area without any disadvantages when cutting the legs.

Claims (15)

1. A front component (10) of furniture, comprising an outer frame (20), an exchangeable inner frame (30) insertable therein, and an exchangeable panel (32) insertable in the inner frame, the outer frame (20) being made up of portions of sectional strips formed with a longitudinal groove (62, 64), characterised in that the sides (12, 14, 16, 18, 22, 24, 26, 28) of the outer and inner frame (20, 30) each form a true mitre and are releasably secured by forces caused by connecting elements (34, 36, 38) extending in the sides (12, 14, 16, 18) of the outer frame (20), and the peripheral inner groove (62, 64) in the outer frame (20) extends in a plane which is offset from the plane containing the inner groove (70, 72, 90, 92) of the inner frame (30).

2. A front component according to claim 1, characterised in that portions (66, 68, 78) of the sides (22, 24, 26, 28, 80) of the inner frame (30) extend in the inner groove (62, 64) in the outer frame (20) and abut the base surface (82) of the inner groove, at least at certain places.

3. A front component according to claim 2, characterised in that the region of the portion (66, 68, 78) facing the base surface (82) is in the form of a groove (84), the edges of which abut the base surface.

4. A front component according to claim 1, characterised in that the visible inner or outer surface (86, 88) of the sides (22, 24, 26, 28, 80) of the inner frame (30) is optionally a part of the outer front of the front component (10).

5. A front component according to claim 1, characterised in that the visible inner and outer surfaces (86, 88) of the inner frame (30) are differently profiled and/or differently coated.

6. A front component according to claim 1, characterised in that the depth of the peripheral groove (62, 64) in the outer frame (20) and/or the inner frame (30) is lower near the inner boundary wall (120) than near the outer wall (104).

7. A front component according to claim 1, characterised in that at least the sectional material of the outer frame (20) is surrounded by a plastics foil (94) which overlaps in the region of the base (82) of the groove.

8. A front component according to claim 7, characterised in that the width of the base (82) of the groove is about twice as great as the depth of the groove, the width of the base being preferably about 13 mm and the depth about 6 mm.

9. A method of producing a front component for furniture comprising a frame and an exchangeable panel, for producing a front furniture component as per claim 1, characterised by the following steps:

a) a portion of a first sectional strip with a longitudinal groove is inserted into a matching longitudinal groove in a second sectional strip,

b) the first and second sectional strips are releasably connected but prevented from sliding,

c) first and second frame sides are produced by cutting the connected sectional strips in a true mitre cut,

d) devices in the second sectional strips are aligned and/or adjusted so as subsequently to form an at least partly releasable connection between them,

e) a top, a bottom and a first lateral second frame side are aligned and connected,

f) the panel, comprising a number of flat components having various decorative effects, is inserted into the groove in the assembled first frame side,

g) the other lateral first and second sides, which form a unit, are connected to the two top and bottom sides by connecting elements.

10. A method according to claim 9, characterised in that

h) before the devices in the second sectional strips are aligned and/or adjusted, the first sectional strip portions are released from the second sectional strip portions,

i) first bores in the longitudinal direction of the second frame sides formed from the second sectional strips are made, starting from the cut surfaces of the sectional strips, the front surface of the second sectional strips being used for standardising the bores,

k) two additional bores are made, starting from the back of the second frame side,

l) the two additional bores intersect the first bores, which extend longitudinally, and

m) the first frame arms formed from the first sectional strips are then inserted into the correspondingly-cut groove in the second frame sides.

11. A method according to claim 10, characterised in that casings of eccentric connecting fittings are inserted in the second bores and angular sockets are inserted in the first bores.

12. A method according to claim 11, characterised in that a top, a bottom and a first lateral second frame side are connected and aligned, via the angular socket, with the end portions of casings of the eccentric connecting fittings, which receive them.

13. A method according to claim 10, characterised in that the steps i) and k) are interchangeable.

14. A method according to claim 10, characterised in that after the first frame sides have been inserted into the longitudinal grooves in the second frame sides, the frame is closed, the first frame sides are optionally aligned and then secured by connecting elements such as tacks, at least one unit comprising a first and a second frame side is removed, and the panel is inserted in the grooves in the open first frame and the frame is then closed by the unit.

15. A method according to claim 9, characterised in that the first and second sectional strips are secured in position relative to one another by means such as nails.

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