DE102011056090B4 - DOOR LEAF, ESPECIALLY FIRE-RESISTANT DOOR LEAF - Google Patents

Abstract

Door leaf (10) in box-and-lid construction, in particular a fire-resistant door leaf, with a first and a second metal sheet element (12, 14), each formed from a metal sheet, which together enclose a door leaf cavity (20), and with a filling (22) inserted into the door leaf cavity (20), wherein on at least one narrow end face (26, 28, 30) of the door leaf (10), edge regions (88, 90) of the metal sheet elements (12, 14) form a side cavity (66) extending in the longitudinal direction of the at least one narrow end face (26, 28, 30), encompassed by the edge regions (88, 90), which is filled with a filling material (74) which is a poorer thermal conductor than the metal sheet, wherein the edge regions (88, 90) of the metal sheet elements surrounding the side cavity (66) (12, 14), without the sheet metal elements (12, 14) directly touching each other, are indirectly connected to each other via the filling material (74), wherein the side cavity (66) is filled with a filling element (64) which has a first strip (70) of thermal insulation material (60) and a second strip (72) of thermal insulation material (60) as filling material (74) and additionally a reinforcing strip (76) which is embedded between the first strip (70) and the second strip (72), wherein the side cavity (66) is enclosed as a whole by a C-profile structure (80) formed by the edge regions (88, 90) of the sheet metal elements (12, 14), and wherein additional strips (152) of thermal insulation material are arranged between the C-profile structure (80) and the regions of the sheet metal elements (12, 14) forming the door leaf broad sides (24, 58) (60) are arranged around the C-profile structure (80).

Description

The invention relates to a door leaf in box-cover construction.

In particular, the invention relates to a door leaf formed from sheet metal elements in the form of a box sheet and a cover sheet. In particular, the door leaf is designed as a fire-resistant door leaf.

From the AT 382 426 B A door leaf in a box-and-cover design is described, wherein a box sheet and a cover sheet do not touch, but are arranged with gaps between them. The door leaf has a C-profile structure in the edge region. The cover sheet protrudes beyond the box sheet and is bent twice to form a protruding door rebate. In the space formed by the bend at the edge region of the box sheet, a multi-layer fire protection sealing strip for the door leaf rebate is inserted. This multi-layer fire protection sealing strip is formed from at least one layer of a fire-resistant material, such as asbestos, and at least one layer of a material that expands under the influence of heat, such as sodium silicates, which are provided alternately with one another.

From the DE 77 079 23 U Furthermore, a door leaf formed from two metal sheets is known, which have U-shaped web folds facing each other at their edges. These web folds serve as reinforcement profiles, are, for example, rolled, riveted, or welded, and are connected to each other without contact using plastic profiles. This creates a double-shell door leaf that is thermally insulated and thermally separated by inserting plastic profiles and asbestos.

From the DE 37 12 737 A1 A fire door with a door leaf made of interconnected sheet metal panels forming a flat box is known. A stiffening frame composed of strips and an insulating insert are arranged within the box. The strips are covered by sheet metal strips running perpendicular to the plane of the door leaf. The strips are made of a material containing an evaporating liquid. The sheet metal strips are bent at least twice and cover the strips on at least three sides.

From the DE 24 49 232 A1 is a door leaf of a fire door with a frame whose frame strips consist of asbestos silicate strips perpendicular to the plane of the door leaf and connected to one another, with thin sheet metal strips being arranged between at least some of the asbestos silicate strips of the frame strips.

The object of the invention is to design a door leaf in box-cover construction which can also be designed as a fire-resistant door leaf, is thermally separated and has a high thermal insulation capacity, can be produced cost-effectively in large series and has an increased rigidity.

To achieve this object, the invention proposes a door leaf having the features of claim 1.

Advantageous embodiments of the invention are the subject of the subclaims.

According to a first aspect, the invention provides a door leaf in box-and-lid construction, in particular a fire-resistant door leaf, with a first and a second metal sheet element, each formed from a metal sheet, which together enclose a door leaf cavity, and with a filling inserted in the door leaf cavity, wherein on at least one narrow end face of the door leaf, edge regions of the metal sheet elements form a side cavity extending in the longitudinal direction of the narrow end face, encompassed by the edge regions, which is filled with a filling material which is a poorer thermal conductor than the metal sheet, wherein the edge regions of the metal sheet elements surrounding the side cavity are indirectly connected to one another via the filling material, without the metal sheet elements directly touching one another.

It is provided that the filling material has a first strip of thermal insulation material, a second strip of thermal insulation material and a reinforcing strip in between.

It is preferred that the reinforcing strip is formed from metal and is formed with a smaller width than the strips of thermal insulation material, wherein the strips of thermal insulation material preferably protrude beyond the reinforcing strip on both sides.

It is particularly preferred that the edge region of at least one of the sheet metal elements forms a U-profile which adjoins a profile region of the sheet metal element, which forms part of the narrow end face and extends in a thickness direction of the door leaf, preferably formed by a double fold, inwards towards the door leaf cavity.

It is preferably provided that both the edge region of the first sheet metal element as well as the edge region of the second sheet metal element are formed in a U-profile manner with U-profile grooves open to one another, so that the U-profile grooves together form the side cavity.

According to the invention, the side cavity is entirely enclosed by a C-profile structure formed by the edge regions of the sheet metal elements. Additional strips of thermal insulation material are arranged around the C-profile structure.

It is preferred that the edge regions of the sheet metal elements have sequences of projections and recesses that are complementary to one another, viewed in the narrow end-side longitudinal direction, wherein the projections of one sheet metal element engage with the recesses of the other sheet metal element without contact, in particular with a distance.

It is particularly preferred that the succession of projections and recesses is formed by rectangular or trapezoidal notches on the outermost edge strips of the metal sheets forming the metal sheet elements.

In an advantageous embodiment, it is provided that the projections are each fastened to the filling material by at least one fastening element, in particular a screw, more particularly a drilling screw.

It is preferably provided that the filling material comprises at least one strip of mineral-based fire protection material, in particular of mineral fiber board or of a vermiculite material.

According to a preferred embodiment of the invention, the front side cavity is formed by repeatedly bending the edge regions.

It is preferred that the narrow-end side cavity filled with the filling material is open to the outside through a gap extending over the narrow end, the width of which is smaller, in particular at least half smaller, than the extension of the side cavity in the thickness direction.

It is particularly preferred that the filling in the door leaf cavity is formed by a mineral fiber board and that the filling and the sheet metal elements are connected to one another in a materially bonded manner over a large area, in particular are glued to one another over a large area.

It is preferably provided that at least the two narrow end faces to be arranged vertically and one narrow end face to be arranged horizontally at the top are each formed with the side cavity extending longitudinally over the entire narrow end face.

It is further preferred that a side cavity is provided on each of the narrow end faces longitudinally over their entire extent, wherein the filling material in the respective first side cavity of the narrow end faces to be arranged vertically is overlapped on the outside by the edge regions of both the first and the second sheet metal element, while a second side cavity of a narrow end face to be arranged horizontally at the bottom is encompassed on the outside only by the edge region of only one of the sheet metal elements, wherein a lower door groove is formed between the lower side cavity and the main extension plane of the other sheet metal element.

• a) Bereitstellen einer ersten Metallblechtafel zum Bilden des ersten Metallblechelements und einer zweiten Metallblechtafel zum Bilden des zweiten Metallblechelements,
• c) Umfalten von Randbereichen der Metallblechtafeln zum Bilden einer U-Profilstruktur,
• d) Umfalten der gesamten U-Profilstruktur und Anpressen, um eine Doppelfaltung zu formen, die einen Teil der äußeren Schmalstirnseitenoberfläche bildet.

Embodiments of the door leaf according to the invention can be produced by a method for producing such a door leaf, in particular a thermally separated one, which comprises the steps:

• a) providing a first metal sheet for forming the first metal sheet element and a second metal sheet for forming the second metal sheet element,
• c) folding the edge areas of the metal sheets to form a U-profile structure,
• d) Folding the entire U-profile structure and pressing it to form a double fold which forms part of the outer narrow face surface.

• b) Ausklinken von umzuformenden Randbereichen der Metallblechtafeln um eine entlang des Randes verlaufende Aufeinanderfolge von Vorsprüngen und Rücksprüngen zu schaffen, wobei die Aufeinanderfolgen von Vorsprüngen und Rücksprüngen an dem ersten und dem zweiten Metallblech komplementär zueinander ausgebildet sind.

A particularly preferred embodiment of the method is characterized by the step to be carried out before step c):

• b) notching edge regions of the metal sheet panels to be formed in order to create a sequence of projections and recesses running along the edge, wherein the sequences of projections and recesses on the first and second metal sheets are complementary to one another.

• e) Einlegen eines Füllelements in die U-Profilstruktur,
• f) Einlegen und Verklebung einer Füllung in einen zwischen den U-Profilstrukturen verbleibenden Türblatthohlraum des ersten Metallblechelements,
• g) Aufsetzen und Verkleben des zweiten Metallblechelements auf die Füllung.

A particularly preferred embodiment of the method is characterized by the steps:

• e) Inserting a filling element into the U-profile structure,
• f) Inserting and gluing a filling into a door leaf cavity remaining between the U-profile structures of the first metal sheet element,
• g) Place and glue the second metal sheet element onto the filling.

According to a preferred embodiment, one goal of the design is to achieve the most complete thermal separation possible between a box panel and a cover panel of a door leaf. For this purpose, strips of mineral plate, in particular strips of a vermiculite plate (for example Thermax® strips), with sheet metal strips in between, are used. Preferably, a new, special edge geometry of the box panel and cover panel is created. In a particularly preferred embodiment, the edges of both the box panel and the cover panel are bent over several times, so that the strip of filler material is only accessible from the outside through a small gap. In order to create a receiving area for the strip of filler material, there is first a complete fold of the panels, viewed from the outside from the outer surface of the end face inwards, followed by a U-profile with two U-legs connected by a web. One U-leg is part of a double fold that forms a profile area for forming the outer end face. One web is preferably designed to extend inwards, parallel to the wide surface of the door leaf; This is followed by the further U-leg, which is formed from the outermost edge strip that forms the edge of the sheet metal panel. This free end region of the U-profile is preferably notched. Preferably, a series of projections and recesses is created here. Preferably, corresponding U-profile structures are formed on both the box panel and the cover panel, which are arranged as a mirror image of one another and thus extend towards one another with their U-profile grooves. The projections and recesses on the free U-webs are complementary and interlock when the metal sheets are assembled. As a result, the two U-profile structures create a C-profile structure overall, with the gap being open towards the outside and the side cavity thus formed being separated from the door leaf cavity towards the inside by the interlocking U-webs.

One design features rectangular notches on the box plate and cover plate, which then alternately interlock. The box plate and cover plate are connected by strips of filler material inserted into the resulting side cavity.

Preferably, the filler material itself is formed from several strips of mineral board with a piece of sheet metal in between. Such a central piece of sheet metal between strips of thermally insulating material, which is inserted into the side cavity, further increases the rigidity of the front broadside profile.

According to a particularly preferred embodiment, neither the box sheet, nor the cover sheet, nor the sheet metal strip located therebetween touch each other.

Fastening is preferably carried out using fastening elements such as screw elements.

Overall, this results in thermal separation and yet a very rigid construction.

There are various approaches to the alternating, interlocking notches. One solution is a rectangular notch. Another solution would be a type of trapezoidal notch, creating dovetail structures. Overall, the sheets can engage behind each other with such notches. With such a dovetail notch or another notch with a rear grip, the sheets can hook behind each other, thus providing additional stiffening, particularly in the event of a fire.

Preferably, the previously described design with a C-profile structure, which is formed by two U-profile structures arranged in mirror image to each other at the edge regions of the sheet metal elements, is formed on the vertically arranged narrow end faces (lock side and hinge side) and on the narrow end face arranged horizontally at the top. A different construction is preferably provided on the narrow end face arranged horizontally at the bottom, in particular to create a downwardly open door groove, for example, to accommodate smoke protection seals or soundproofing materials. In a preferred embodiment, only the box sheet is bent around filler material in the lower region. Here, only a strip of filler material can be provided, i.e., without the interposition of another sheet metal strip. If the box sheet is connected to the cover sheet by the strip of filler material with a metal screw, a ring of thermally insulating material is preferably inserted below the screw head to achieve complete thermal separation. In such a construction, where connections in the top and side end areas are only made over the filling material and where thermal bridges are created at the bottom by washers made of thermally separating material, a complete thermal separation between the box plate and the cover plate can be achieved.

The preferred edge geometry with an inwardly extending U-profile can be achieved using cold forming machines, such as roll formers with multiple rolling tools. The aforementioned double fold can be achieved, for example, by gripping the profile structure from behind and pressing it from behind.

A preferred method for producing the edge geometry involves folding from the outside in. First, the notches are made on the sheets to create the sequence of projections and recesses. Then, the notched sheets are folded, then the U-shaped webs and U-shaped legs are folded, and finally, the double fold is performed with pressing.

Bonding is preferred for joining the panel and metal sheets. Preferably, the panel filling is essentially formed by a mineral fiberboard, which is bonded over a large area to the inner surfaces of the door leaf's broad sides. This means that the door leaf is not only stiffened by stiffening folds on the end faces; the main part of the stiffening is achieved by the sandwich construction of the superimposed and bonded layers. Due to the large-area or full-surface bonding, the door leaf construction is inherently very rigid, eliminating the need for additional metal rods at the edges.

It should be noted that in the event of a fire, very high bending moments act on the door leaves of fire doors. In a fire, one of the broad sides of the door leaf becomes very hot, while the other broad side has a much lower temperature, leading to uneven expansion of the metal sheets and, in the event of a fire, to bending. However, thanks to the multiple folds and the sandwich construction with layers bonded together, lying on top of each other, this can be easily managed without the need for additional stiffening elements.

• 1 eine Vorderansicht auf eine Türblattbreitseite einer Ausführungsform eines Türblatts;
• 2 eine Ansicht auf die schlossseitige Schmalstirnseite des Türblatts von links in 1 gesehen;
• 3 eine Ansicht auf die bandseitige Schmalstirnseite des Türblatts von rechts in 1 gesehen;
• 4 eine Draufsicht auf die obere Schmalstirnseite des Türblatts von oben in 1 gesehen;
• 5 eine Unteransicht auf die untere Schmalstirnseite des Türblatts von unten in 1 gesehen;
• 6 eine Detailansicht des Details VI in 3;
• 7 einen Horizontalschnitt entlang der Linie VII-VII durch das Türblatt von 1;
• 8 eine Detailansicht des Details VIII von 7;
• 9 eine Detailansicht des Details IX von 7;
• 10 einen Vertikalschnitt entlang der Linie X-X durch das Türblatt von 1;
• 11 eine vergrößerte Detailansicht des Details XI von 10;
• 12 eine vergrößerte Detailansicht des Details XII von 10;
• 13 eine Ansicht aus dem Inneren eines Türblatthohlraums von 1 ohne Füllung entlang der Linie XIII-XIII in 1;
• 14 einen Teil des Schnitts XIV-XIV von 1 ohne Füllung des Türblatts;
• 15 eine perspektivische Explosionsansicht des Türblatts von 1 mit den einzelnen Teilen des Türblatts;
• 16 ein vergrößerter Bereich aus der Darstellung von 15, der den unteren bandseitigen Bereich eines Kastenblechs des Türblatts näher darstellt;
• 17 einen vergrößerten Bereich der Darstellung von 15 im Bereich der oberen Schmalstirnseite der Kastenblech-Konstruktion;
• 18 einen vergrößerten Bereich der Darstellung von 15 im Bereich der unteren Schlossseite der Kastenkonstruktion; und
• 19 einen vergrößerten Bereich der Darstellung von 15, die eine schlossseitige untere Ecke der Deckelblech-Konstruktion darstellt.

Embodiments of the invention are explained in more detail below with reference to the accompanying drawings, in which:

• 1 a front view of a door leaf broad side of an embodiment of a door leaf;
• 2 a view of the lock-side narrow front side of the door leaf from the left in 1 seen;
• 3 a view of the hinge-side narrow end face of the door leaf from the right in 1 seen;
• 4 a plan view of the upper narrow face of the door leaf from above in 1 seen;
• 5 a bottom view of the lower narrow end face of the door leaf from below in 1 seen;
• 6 a detailed view of detail VI in 3 ;
• 7 a horizontal section along the line VII-VII through the door leaf of 1 ;
• 8 a detailed view of detail VIII of 7 ;
• 9 a detailed view of detail IX of 7 ;
• 10 a vertical section along the line XX through the door leaf of 1 ;
• 11 an enlarged detail view of detail XI of 10 ;
• 12 an enlarged detail view of detail XII of 10 ;
• 13 a view from the inside of a door leaf cavity of 1 without filling along the line XIII-XIII in 1 ;
• 14 part of section XIV-XIV of 1 without filling the door leaf;
• 15 a perspective exploded view of the door leaf of 1 with the individual parts of the door leaf;
• 16 an enlarged area from the display of 15 , which shows the lower hinge-side area of a box plate of the door leaf in more detail;
• 17 an enlarged area of the display of 15 in the area of the upper narrow end face of the box-type sheet metal construction;
• 18 an enlarged area of the display of 15 in the area of the lower lock side of the box construction; and
• 19 an enlarged area of the display of 15 , which represents a lock-side lower corner of the cover plate construction.

The attached figures show an embodiment of a door leaf 10 for a fire door in a box-and-cover construction. The door leaf 10 comprises a first metal sheet element 12 and a second metal sheet element 14. The two metal sheet elements 12, 14 are formed from metal sheets by folding. The first metal sheet element 12 forms a box 16; and the second metal sheet element forms a cover 18. Between the box 16 and the cover 18, a door leaf cavity 20 is formed, which is filled by a filling 22.

In 1 The first door leaf broad side 24 formed by the second metal sheet element 14, ie the cover 18, is shown here. In the 2 to 5 the four narrow end faces 26, 28, 30, 32 of the door leaf 10 are shown, whereby in 2 and 3 vertically arranged narrow end faces 26, 28 and in the 4 and 5 horizontally arranged narrow end faces 30 and 32 are shown.

For example, the 2 The narrow end face 26 shown, which is to be arranged vertically, has the lock side 34, which is provided approximately centrally with a lock receptacle 36 in which a door lock 38 with latch (catch) 40 and bolt 42 is accommodated.

For example, the 3 The vertically arranged narrow end face 28 shown in FIG. 1 is the hinge side 44, which is provided with a first hinge 46 and a second hinge 47 and securing bolts 48. The 4 The horizontally arranged narrow end face 30 shown is the top side 50 and the 5 The horizontally arranged narrow end face 32 shown is the underside 52, which is provided with a lower door groove 54. The door leaf 10 is rebated on three sides, with a rebate 56 projecting from the vertically arranged narrow end faces 26, 28 and the upper horizontally arranged narrow end face 30 being formed by staggering on the cover 18. The box 16 formed by the first sheet metal element 12 forms the second door leaf broad side 58.

The door leaf 10 is designed to be completely thermally separated, such that the sheet metal elements 12, 14 are only indirectly connected via a thermal insulation material 60 with poor thermal conductivity compared to metal. For this purpose, a narrow gap 62 is provided between the sheet metal elements 12, 14 on the two vertically arranged narrow end faces 26, 28, on the upper horizontally arranged narrow end face 30, and within the door groove 54 on the lower horizontally arranged narrow end face 32, so that the sheet metal elements 12, 14 do not touch each other. The sheet metal elements 12, 14 are indirectly connected to one another via a filling element 64, 65, which is housed in side cavities 66, 68 provided in the area of the narrow end faces 26, 28, 30, 32. These side cavities 66, 68 will be discussed in more detail below.

In 6 is that in 3 The detail shown of the connection of the door hinge 47 is shown in more detail. The door hinge 47 has a door leaf-side hinge frame part, which is attached to the hinge side 44.

7 shows a horizontal section along line VII-VII through the door leaf 10, showing the filling 22 between the metal sheet elements 12, 14. The outermost side areas of the narrow end faces 26, 28, 30 are further thermally insulated by additional strips 152 of thermal insulation material 60.

8 shows a cross-sectional view of the lock receptacle 36 with the door lock 38. The door lock 38 is protected by side panels 150 made of thermal insulation material 60.

9 shows the detail IX of 7 with the first side cavity 66; 10 shows the section along the line XX through the entire door leaf 10 with panel and upper and lower areas of the narrow end faces 30, 32; and 11 shows a detail of the upper region of the horizontally arranged narrow end face 30 with the first side cavity 66. The first side cavity 66 is filled with a first filling element 64. 12 shows the lower region of the narrow end face 32 to be arranged horizontally at the bottom with a second side cavity 68 designed differently from the first side cavity 66. The second side cavity 68 is filled with a second filling element 65.

The design of the side cavities 66, 68 and the filling elements 64, 65 inserted therein is described below with reference to the illustrations in the 9 , 11 and 12 explained in more detail.

The first filling element 64, which is 9 and 11 , comprises a first strip 70 and a second strip 72 made of filler material 74 formed by the thermal insulation material 60, wherein a reinforcing strip 76 made of a material with a higher mechanical strength than the thermal insulation material 60 is embedded between the two strips 70, 72. For example, the reinforcing strip 76 is formed of sheet metal 78. The strip of sheet metal 78 has a significantly smaller thickness than the two strips 70, 72 and is also provided with a smaller width transversely to the longitudinal extent of the strips 70, 72 than the two strips 70, 72.

The strips 70, 72 of thermal insulation material 60 protrude on both sides beyond the reinforcing strips 76, so that even when using sheet metal 78 as reinforcing material, no thermal bridge or cold bridge is created between the sheet metal elements 12, 14.

The edges of the side cavities 66, 68 are preferably formed by folding over side regions of the metal panels forming the sheet metal elements 12, 14.

In the 9 and 11 In the first side cavity 66 shown, the edge essentially has a C-profile structure 80 with a C-web 82 and two C-legs 84, wherein at the free ends of the C-legs 84 formed on the narrow end faces 26, 28, 30, C-flanges 86 directed towards one another protrude perpendicularly to the C-legs 84 towards one another and leave the gap 62 free between them.

As in 11 As indicated, the gap 62 has a width S that is approximately in the range of the width F of each C-flange 86. For example, the width S of the gap 62 is approximately 1/3 (± 10%) of the total width (S+2xF) of the first side cavity 66.

In a preferred embodiment, the C-profile structure 80, which forms the edge of the first side cavity 66, is formed partly by an edge region 88 of the first sheet metal element 12 and partly by an edge region 90 of the second sheet metal element 14.

Preferably, each of these edge regions 88, 90 is shaped such that it is formed into a U-profile 96, 98 from its narrow end profile region 92, 94, which forms the respective outer surface of the narrow end face 26, 28, 30 and runs in the thickness direction of the door leaf, inwards towards the door leaf cavity 20.

The first U-profile 96 of the first metal sheet 12 has an outer U-leg 100, adjoining thereto a first U-web 102 and adjoining thereto an inner U-leg 104, wherein the U-legs 100, 104 and the U-web 102 connecting them form a first U-profile groove 106 which is open towards the second metal sheet element 14.

The edge region 90 of the second sheet metal element 14 has a correspondingly complementary second U-profile 98 with a second outer U-leg 108, a second U-web 110 and a second inner U-leg 112. The two second U-legs 108, 112 and the second U-web 110 located therebetween together form a second U-profile groove 118 which is open towards the first U-profile groove 106.

13 shows a view from the inside of the door leaf cavity without filling, seen on the C-web 82 of the vertically arranged narrow end faces 26, 28 and 14 shows a view from the interior of the door leaf cavity without filling upwards onto the C-web 82 on the upper horizontally arranged narrow end face 30. It can be seen that the inner U-legs 104, 112 of the two sheet metal elements 12, 14 have complementary sequences of projections 120a, 120b, 121a, 121b and recesses 122a, 122b, 123a, 123b which engage with one another. The first projections 120a, 120b of the edge region 88 of the first metal sheet element 12 engage in the second recesses 123a, 123b of the edge region 90 of the second metal sheet element 14, while the second projections 121a, 121b formed on the second metal sheet element 14 engage in the first recesses 122a, 122b. It is furthermore the 13 and 14 It can be seen that there is a minimum distance A between the projections 120a, 120b, 121a, 121b and the recesses 122a, 122b, 123a, 123b, so that the edge regions 88, 90 of the sheet metal elements 12, 14 do not touch.

As in 13 As shown in the example of the vertically arranged end faces, the projections 120a, 121a and the recesses 122a, 123a can have rectangular edges. 14 The end face 30 shown, which is to be arranged horizontally at the top, shows that the projections 120b, 121b and the recesses 122b, 123b can also be trapezoidal in shape with oblique transitions, so that the projections 120b, 121b and the recesses 122b, 123b engage behind one another in a form-fitting manner and can hook behind one another when the metal sheets move apart, e.g. in the event of a fire.

As can be seen from the 13 and 14 As can be seen, the inner U-legs 104, 112 engage with each other with projections/recesses and together form the C-web 82. One of the C-legs 84 is formed by the first U-web 102, and the other C-leg 84 is formed by the second U-web 110. The C-flanges 86 are formed by the outer U-legs 100, 108, which are folded back completely on the narrow end profile area 92, 94, so that the C-flanges 86 are reinforced by double folds.

In 13 and 14 Fasteners 124, in particular formed by drilling screws 126, are indicated, which connect the respective projections 120a, 120b, 121a, 121b to the first filler element 64 and there engage in particular into the metal sheet 78 of the reinforcement strip 76. Since the reinforcement strip 76 is surrounded by thermal insulation material 60, it is thermally insulated from the metal sheet elements 12, 14. This results in an indirect fastening of the metal sheet elements 12, 14 solely via the filler material of the filler element 64.

In the 12 In the lower narrow end region 32 shown, a second side cavity 68 is formed, which is different from the first side cavity 66 and is filled by a second filling element 65. This second filling element 65 is simply formed from a strip of thermal insulation material 60.

The door groove 54 is formed by folding the first lower edge region 128 of the first metal sheet element 12 back by 180°, starting from the main region forming the second door leaf broadside 58, to form a double-folded lower profile edge region 130. This is followed by a 90° bend, so that the edge region 128 extends further in the thickness direction and forms the groove base 132 of the door groove 54. This groove base 132 does not extend all the way to the second metal sheet element 14, but ends at a distance from it.

The second lower edge region 133 of the second metal sheet 14 is initially bent by 90° in the thickness direction, starting from the main region forming the first door leaf broadside 24, to form an outermost lower profile region 134; this is followed by a stepped formation 136 with two stepped flanks 138, 140, whereupon the second lower edge region 133 has an upwardly extending edge end strip 142. The edge end strip 142 is designed to end at a distance from the groove base 132, so that the gap 62 between the metal sheet elements 12, 14 is formed here. As a result, the second lateral cavity 68 is delimited on its upper side by the groove base 132 and is encompassed on its three other sides by the second lower edge region 133 of the second metal sheet element 14. The second lower edge region 133 is fastened to the first lower edge region 128 by a series of fasteners 124, which may be self-tapping screws 126, for example. A ring 146 made of thermal insulation material 60, similar to a washer, is inserted between each screw head 144 and the second lower edge region 133, for example between the screw head 144 and the stepped flank 140.

The 15 to 19 show a perspective exploded view of the door leaf 10 with the first metal sheet element 12, the second metal sheet element 14 of the filling 22 and the elements of additional thermal insulation material 60.

The filling 22 is formed, for example, by a mineral fiber board 148, which is bonded to the inside of the metal sheet elements 12, 14 over a large area on the door leaf broad sides 24, 58. The thermal insulation material 60 is preferably strips of a mineral fire protection board, in particular preferably based on vermiculite. For example, the company Knauf offers a corresponding fire protection board under the brand name "Thermax". The strips 70, 72 of the first filling element 64 and the second filling element 65 are cut from such a mineral board. The lock receptacle 36 is also insulated by small board elements 150 made of this thermal insulation material 60. Additional strips 152 made of this thermal insulation material 60 are arranged around the C-profile structures 80, as can be seen in particular from the 9 and 11 as well as 14 and the 15 , 16 and 18 and 17.

The area of the fold 46 is also defined by such additional strips 152, which have a 15 shown frame 154 made of the heat insulation material 60.

During the production of the sheet metal elements 12, 14, the U-profiles 96, 98 are formed from sheet metal panels by cold forming the edge areas, starting from the outside inward. Finally, the double folds of the C-flanges 86 are pressed on.

Overall, a door leaf 10 made of cost-effective materials has been created, which can also meet high fire protection classes and is also particularly thermally insulating. The door leaf 10 can thus also be used as a door between rooms with large temperature differences, for example, as a partition between a living area and a garage or as an exterior door, and contributes to energy savings through the complete thermal separation between the door leaf broad sides 24, 58.

The formation of the side cavities 66, 68 by profile structures 80, 96, 98 results in a high rigidity of the door leaf 10, which is further reinforced by the reinforcement strip 76 running along the narrow end faces 26, 28, 30. The sandwich structure contributes to additional stiffening by bonding the metal sheet elements 12, 14 to the filling 22.

• Die Erfindung betrifft ein Türblatt 10 in Kasten-Deckelbauweise, insbesondere Feuerschutz-Türblatt, mit einem ersten und einem zweiten jeweils aus einer Metallblechtafel gebildeten Metallblechelement 12, 14, die zusammen einen Türblatthohlraum 20 umschließen, und mit einer in dem Türblatthohlraum 20 eingefügten Füllung 22, wobei an wenigstens einer Schmalstirnseite 26, 28, 30, 32 des Türblatts 10 Randbereiche 88, 90; 128, 133 der Metallblechelemente 12, 14 einen sich in Längsrichtung der wenigstens einen Schmalstirnseite 26, 28, 30, 32 erstreckenden, von den Randbereichen 88, 90; 128, 133 umgriffenen Seitenhohlraum 66, 68 bilden, der durch ein Füllmaterial 74, das thermisch schlechter als das Metallblech leitet, befüllt ist, wobei die den Seitenhohlraum 66, 68 umgebenden Randbereiche der Metallblechelemente 12, 14, ohne dass sich die Metallblechelemente 12, 14 einander direkt berühren, mittelbar über das Füllmaterial 74 miteinander verbunden sind. Dadurch wird mit einfachen Mitteln und wenig Metallmaterial ein vollständig thermisch getrenntes Türblatt 10 mit besonderer Steifheit ermöglicht.

In summary, it can be said:

• The invention relates to a door leaf 10 in box-and-lid construction, in particular a fire-resistant door leaf, with a first and a second metal sheet element 12, 14, each formed from a metal sheet, which together enclose a door leaf cavity 20, and with a filling 22 inserted in the door leaf cavity 20, wherein on at least one narrow end face 26, 28, 30, 32 of the door leaf 10, edge regions 88, 90; 128, 133 of the metal sheet elements 12, 14 have a longitudinally extending edge region 88, 90; 128, 133 of the metal sheet elements 12, 14, which edge region 88, 90; 128, 133 extends in the longitudinal direction of the at least one narrow end face 26, 28, 30, 32 and is guided in a recess 88, 90; 128, 133, which is filled with a filling material 74 which is a poorer thermal conductor than the metal sheet, wherein the edge regions of the metal sheet surrounding the side cavity 66, 68 The sheet metal elements 12, 14 are indirectly connected to one another via the filling material 74, without the sheet metal elements 12, 14 directly touching one another. This enables a completely thermally separated door leaf 10 with particular rigidity to be created using simple means and little metal material.

List of reference symbols:

10

door leaf

12

first sheet metal element

14

second sheet metal element

16

Crate

18

Lid

20

Door leaf cavity

22

filling

24

first door leaf broadside

26

vertically arranged narrow front side

28

vertically arranged narrow front side

30

horizontally arranged narrow front side

32

horizontally arranged narrow front side

34

Castle side

36

Lock recording

38

door lock

40

trap

42

Bar

44

Band page

46

first door hinge

47

second door hinge

48

locking bolt

50

Top

52

bottom

54

door groove

56

fold

58

second door leaf broadside

60

Thermal insulation material

62

gap

64

first filling element

65

second filling element

66

first lateral cavity

68

second side cavity

70

first strip

72

second stripe

74

Filling material

76

Reinforcement strips

78

sheet metal

80

C-profile structure

82

C-bridge

84

C-leg

86

C-flanges

88

Edge area of the first metal sheet element

90

Edge area of second metal sheet element

92

Narrow end profile area first metal sheet

94

Narrow end profile area first metal sheet

96

first U-profile

98

second U-profile

100

first outer U-leg

102

first U-bridge

104

first inner U-leg

106

first U-profile groove

108

second outer U-leg

110

second U-bridge

112

second inner U-leg

118

second U-profile groove

120a

first projections (on vertically arranged end faces)

120b

first projections (on the top horizontally arranged front side)

121a

second projections (on vertically arranged end faces)

121b

second projections (on the top horizontally arranged front side)

122a

first recesses (on vertically arranged front sides)

122b

first recesses (on the top horizontally arranged front side)

123a

second recesses (on vertically arranged front sides)

123b

second recesses (on the top horizontally arranged front side)

124

fasteners

126

Drilling screws

128

first lower edge area

130

lower profile edge area

132

Groove base

133

second lower edge area

134

lower profile area

136

Staged training

138

Step flank

140

Step flank

142

Edge end strip

144

screw head

146

ring

148

Mineral fiber board

150

Plate element

152

additional stripes

154

Frame made of thermal insulation material

S

Gap width

F

Width C-flange

A

Minimum distance

Claims (15)

Door leaf (10) in box-and-lid construction, in particular a fire-resistant door leaf, with a first and a second metal sheet element (12, 14), each formed from a metal sheet, which together enclose a door leaf cavity (20), and with a filling (22) inserted into the door leaf cavity (20), wherein on at least one narrow end face (26, 28, 30) of the door leaf (10), edge regions (88, 90) of the metal sheet elements (12, 14) form a side cavity (66) extending in the longitudinal direction of the at least one narrow end face (26, 28, 30), encompassed by the edge regions (88, 90), which is filled with a filling material (74) which is a poorer thermal conductor than the metal sheet, wherein the edge regions (88, 90) of the metal sheet elements surrounding the side cavity (66) (12, 14), without the sheet metal elements (12, 14) directly touching each other, are indirectly connected to each other via the filling material (74), wherein the side cavity (66) is filled with a filling element (64) which has a first strip (70) of thermal insulation material (60) and a second strip (72) of thermal insulation material (60) as filling material (74) and additionally a reinforcing strip (76) which is embedded between the first strip (70) and the second strip (72), wherein the side cavity (66) is enclosed as a whole by a C-profile structure (80) formed by the edge regions (88, 90) of the sheet metal elements (12, 14), and wherein additional strips (152) of thermal insulation material are arranged between the C-profile structure (80) and the regions of the sheet metal elements (12, 14) forming the door leaf broad sides (24, 58) (60) are arranged around the C-profile structure (80). Door leaf after Claim 1 , characterized in that the reinforcing strip (76) is formed of metal and is formed with a smaller width than the strips (70, 72) of thermal insulation material (60), wherein the strips (70, 72) of thermal insulation material (60) protrude beyond the reinforcing strip (76). Door leaf after Claim 2 , characterized in that the strips (70, 72) of thermal insulation material (60) protrude on both sides beyond the reinforcing strip (76). Door leaf according to one of the preceding claims, characterized in that the edge region (88, 90) of at least one of the sheet metal elements (12, 14) forms a U-profile (96, 98) which adjoins a profile region (92, 94; 86) of the sheet metal element (12, 14) forming part of the narrow end face (26, 28, 30) and extending in a thickness direction of the door leaf (10) inwards towards the door leaf cavity (20). Door leaf after Claim 4 , characterized in that both the edge region (88) of the first metal sheet element (12) and the edge region (90) of the second metal sheet element (14) are formed in a U-profile manner with U-profile grooves (106, 118) open to one another, so that the U-profile grooves (106, 118) together form the side cavity (66). Door leaf after Claim 4 or 5 , characterized in that the profile region (92, 94; 86) extending in the thickness direction is formed by a double fold. Door leaf according to one of the preceding claims, characterized in that the edge regions (88, 90) of the sheet metal elements (12, 14) have, as seen in the narrow end longitudinal direction, successions of projections (120a, 120b, 121a, 121b) and recesses (122a, 122b, 123a, 123b) which are complementary to one another, wherein the projections (120a, 120b) of one sheet metal element (12) engage in the recesses (123a, 123b) of the other sheet metal element (14) without contact, in particular at a distance. Door leaf after Claim 7 , characterized in that the succession of projections projections (120a, 120b, 121a, 121b) and recesses (122a, 122b, 123a, 123b) are formed by rectangular or trapezoidal notches on the outermost edge strips of the metal sheets forming the metal sheet elements (12, 14). Door leaf after Claim 7 or after Claim 8 , characterized in that the projections (120a, 120b, 121a, 121b) are each fastened to the filling material (74) by at least one fastener (124). Door leaf according to one of the preceding claims, characterized in that the filling material (74) is formed by strips (70, 72) of mineral-based fire protection material. Door leaf according to one of the preceding claims, characterized in that the at least one end-side side cavity (66) is formed by repeatedly bending the edge regions (88, 90). Door leaf according to one of the preceding claims, characterized in that the at least one narrow-end side cavity (66) filled with the filling material (74) is open to the outside through a gap (62) extending over the narrow end, the width of which gap is smaller than the extension of the side cavity (66) in the thickness direction. Door leaf according to one of the preceding claims, characterized in that the filling (22) is formed by a mineral fiber board (148) and that the filling (22) and the sheet metal elements (12, 14) are connected to one another in a materially bonded manner over a large area. Door leaf according to one of the preceding claims, characterized in that at least the two narrow end faces (26, 28) to be arranged vertically and one narrow end face (30) to be arranged horizontally at the top are each formed with the side cavity (66) extending longitudinally over the entire narrow end face. Door leaf according to one of the preceding claims, characterized in that on all narrow end faces (26, 28, 30, 32) a side cavity (66, 68) is provided longitudinally over their entire extent, wherein in a first side cavity (66) provided on the narrow end faces (26, 28) to be arranged vertically and the narrow end face (30) to be arranged horizontally at the top, a first filling element (64) with the filling material (74) is overlapped on the outside by the edge regions (88, 90) of both the first and the second sheet metal element (12, 14), while a second side cavity (68) filled with a second filling element (65) on the narrow end face (32) to be arranged horizontally at the bottom is encompassed on the outside only by the edge region (133) of only one of the sheet metal elements (14), wherein between the lower second A lower downwardly open door groove (54) is formed between the side cavity (68) and the main extension plane of the other sheet metal element (12).

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