EP2455575A2 - Method for manufacturing a folded door leaf and door leaf - Google Patents

Abstract

The method involves folding two parallel edge areas at appropriate parallel edges of a box metal sheet (12) and a lid metal sheet (14). An edge portion (54) of the box metal sheet and the lid metal sheet is folded. A spring (72) is inserted into a receiving groove (58) along the displacement direction. The box metal sheet and the lid metal sheet are connected with each other through interlocking hook portions of rear gripping elements, until the spring is connected with the receiving groove. An independent claim is included for door leaf.

Description

The invention relates to a method for producing an at least two-sided rebated door leaf made of sheet metal in box and lid construction and such a door leaf.

Folded door leaves and methods for their preparation are known in the art.

In the DE 199 34 680 C2 is described a door leaf with circumferential fold area, in which a vorgefälztes already in the four edge areas box plate and a non-folded cover sheet are placed on each other and then connected by bending the cover plate to form a Dickfalzes. Thus, at least three process steps for the production of the door leaf are necessary, namely a first Umfälzschritt, the joining and a second Umfälzschritt after assembly.

In the DE 10 2005 023 426 B3 discloses a method in which both a box plate and a thick-seamed cover sheet in the edge region, but not in the rebate, haken hook profiles hooked into one another for connection of the box with the cover sheet. After hooking the hook profiles are mutually displaced.

In the DE 10 2008 056 502 A1 a groove is provided in a box panel of a door leaf in the edge region, which has holes on a leg lying in the inside of the box plate. A cover plate has in the edge region on springs which engage in the groove, wherein at the end of the springs hooks are provided which in the assembly of box and cover in the Engage holes. The two profiles are connected by placing the cover sheet on the box sheet and then squeezing the two sheets together so that the springs are pressed deeply into the grooves and the hooks snap into the holes.

The WO 82-04281 discloses a door leaf with two symmetrically formed door panels. The door panels have to each other to be straightened corners Umgreifungen over which the door panels are interconnected. The resulting door leaf is formed without fold due to the symmetrical design of the door panels.

The GB 2 254 872 A shows a dull executed door leaf. The lateral edge regions of a box and a cover plate, which form the corners of the door leaf after connection, are bent so that they engage in accordance with a tongue and groove connection.

In the documents DE 35 34 233 A1 . US 1 848 715 . DE 35 20 500 A1 such as DE 28 11 142 A1 Door leaves are disclosed in which a box and a cover plate are connected to each other via interlocking engagement means in the edge region, but not in a rebate area.

The DE 24 37 261 A1 discloses a door leaf in a box-lid construction, in which an edge region of the box is supported on a rebated to a fold region edge region of the lid, so as to form a firm connection of the box and lid. The connection is made by compressing the box into the lid.

In the EP 09 89 277 A2 a door leaf is disclosed in which a box panel and a cover plate are often bent so that they engage inside a folding area behind the other and that the folding area is arranged spaced from the actual door leaf.

The CH 36 55 19 describes a door leaf in which a plurality of curved stiffening plates are welded to the side edges of the door panels, so as to keep an inserted between the door panels insulating in place.

Folded door leaves have the advantage that they lie with the door closed over a projection on the door frame. Since there is no visible gap between the door leaf and the frame, these doors usually provide better heat and sound insulation than door leaves with blunt termination and are particularly suitable for use in fire doors.

Although in the known rebated door leaves Hinterhakeinrichtungen are known, via which a box panel can be connected to a cover plate, but these are usually not in the rebate area, but arranged in an edge area next to the fold. Such an arrangement makes the connection visible, which is often undesirable for optical reasons and prone to adverse external influences.

However, when the rear hooks are arranged in the fold area itself, this often leads to complex connection methods, since with circumferential Hinterhakungen on all four sides of the door leaf, the sheets must first be pre-bent, then placed on each other and then processed to form the fold area further by be bent over again.

The object of the invention is to provide a method for producing a visually appealing door leaf in box and lid design available, which is simple and inexpensive to manufacture.

The object of the invention is achieved by a method having the features of claim 1. A corresponding door leaf is the subject of the independent claim.

Advantageous embodiments of the invention are the subject of the dependent claims.

1. a) Bereitstellen eines Kastenbleches und eines Deckelbleches zum Bilden von Kasten und Deckel;
2. b) Umfälzen von zwei parallelen Randbereichen an entsprechenden parallelen Rändern des Kastenbleches und des Deckelbleches, um einander in Längsrichtung der Randbereiche verschiebbar hintergreifende Hintergreifeinrichtungen innerhalb zweier paralleler Türfalze zu bilden;
3. c) Umfälzen wenigstens eines dritten Randbereichs von Kastenblech und Deckelblech, so dass an einem der Bleche eine Aufnahmenut und an dem anderen der Bleche eine in die Aufnahmenut in Verschieberichtung einführbare Feder entsteht;
4. d) Zusammenfügen von Kastenblech und Deckelblech durch Ineinanderhaken der Hintergreifeinrichtungen und Verschieben, bis die Feder in die Aufnahmenut eingreift.

A method of manufacturing a rebated door panel of box and lid metal sheets comprises the following steps:

1. a) providing a box plate and a cover plate for forming box and lid;
2. b) refolding two parallel edge regions at respective parallel edges of the box plate and the cover plate to form behind each other in the longitudinal direction of the edge regions slidably engaging behind rear gripping means within two parallel Türfalze;
3. c) refolding at least a third edge region of the box plate and the cover plate, so that a receiving groove is formed on one of the plates and on the other of the plates, a spring which can be introduced into the receiving groove in the direction of displacement;
4. d) joining the box plate and cover sheet by hooking the rear gripping devices and moving until the spring engages in the receiving groove.

The structure with letters a), b) c) and d) is chosen purely for the sake of simplicity and contains no statement about a particular order. In particular, the order of steps b) and c) is arbitrary.

With such a method, a door leaf is formed, which has a folding area on at least three sides, which seals the door frame after installation of the door leaf in a door frame. Thus, the door is particularly suitable as a fire door.

The connections lie in the fold areas and are therefore not exposed to negative influences from the outside or not visible.

The rear gripping devices at the edge regions of the box plate and the cover plate are designed such that they are nevertheless displaceable in the longitudinal direction against each other during manufacture, after they have been interengaged behind each other. So can simply be placed on the box plate after already carried out Umfälzen the edge regions of the cover plate and the two sheets by shifting against each other be connected to each other. Advantageously, can be dispensed with further forming steps. For example, a further Umfälzen in the folding area is no longer necessary. The entire process is thus simpler and less expensive.

In a third edge region, which is arranged orthogonally to the first two parallel edge regions, a receiving groove is provided on one of the sheets and on the other of the sheets a spring. The term "spring" is understood to mean an engagement arrangement designed to engage in a groove in the manner of a tongue and groove connection. When moving the box plate against the cover plate, the spring is inserted into the receiving groove and thus the sheets are also closely connected in the third edge region. Again, the connection is already before assembly of the sheets, e.g. by refolding of the sheets present, preferably in such a way that no further forming steps after joining are more necessary.

Preferably, a fourth edge region of the box plate and cover plate is folded over so that a second receiving groove is formed on one of the plates and a second spring which can be inserted into the receiving groove in the direction of displacement is formed on the other of the plates. Thus, a firm connection between the box and cover sheet is also provided in a fourth fold area, which nevertheless advantageously makes it possible to provide the solid compound of box and cover sheet by merely folding and subsequent insertion. The fourth edge region preferably runs parallel to the third edge region and orthogonal to the first two parallel edge regions.

• d1) Auftragen einer Kleberschicht auf das Kastenblech zwischen den umgefälzten vier Randbereichen;
• d2) Einlegen einer Isoliereinlage auf die Kleberschicht; und/oder
• d3) Auftragen einer Kleberschicht auf die Isoliereinlage auf.

In a particularly preferred embodiment, step d) comprises at least one of the steps

• d1) applying an adhesive layer to the box panel between the folded four edge areas;
• d2) inserting an insulating insert on the adhesive layer; and or
• d3) applying an adhesive layer to the insulating insert.

The door leaf can thus preferably be equipped with fire protection material by simply gluing an insulating insert between the box and cover plate. Furthermore, the connection is advantageously also narrower if additional adhesive layers are introduced. Thus, it is advantageously avoided that the door leaf must be welded, riveted and / or screwed at any point in the process, and the production is further simplified and cheaper.

A door leaf with a box and a cover plate has at two parallel edge regions on corresponding parallel edges of the box and cover plate in the longitudinal direction of the edge regions slidably engaging behind engaging behind, at a third edge region of the sheet a receiving groove and on the other of the sheets a formed in the receiving groove in the direction of insertion spring is formed.

Such a door leaf is particularly easy to produce with the method described above and requires only two process steps, namely the Umfälzen the first, second and third edge regions and then the juxtaposition and against each other moving box and lid, so that the box and cover plate to the door leaf get connected.

Advantageously, a first rear engagement device is designed as a first U-profile with an inner leg, an outer leg and a first web therebetween. Particularly preferably, the outer leg is angled at an angle greater than 90 ° to the first web. The U-profile is thus advantageously angled inward and a counterpart can be supported on the inwardly angled outer leg.

Preferably, a second rear gripping device is designed for gripping around the first rear gripping device. In this case, the second rear engagement device is advantageously formed as a second U-profile with an upper leg, a lower leg and a second web therebetween, wherein on the lower leg an angled portion is formed by more than 90 ° inwards. These Angling can easily be supported on the outer leg of the first U-profile. Since the second rear gripping device further surrounds the first rear gripping device and thus advantageously also the outer leg, the two sheets can be easily connected to each other by the first U-profile is inserted into the second U-profile.

Preferably, the angled portion is angled at the same angle as the angle between the first web and the outer leg, the outer leg and the bend are parallel to each other and are supported against each other. They can be arranged particularly close to one another without an undesired entanglement occurring during the displacement, which prevents the box from being moved further to the cover plate. Nevertheless, a tight connection between the box and the cover plate is preferably ensured by the close concern of the bend and the outer leg.

In a particularly preferred embodiment, the bend is formed on an envelope of the lower leg. If the lower leg of the second U-profile advantageously has an envelope, it becomes more resistant to bending. The stability is transmitted in total over the bend on the entire folding region of the door leaf, so that the envelope not only stabilizes the lower leg of the second U-profile, but also advantageous at the same time the entire folding region of the door leaf.

The first U-profile is preferably designed to encompass the bend. Thus, not only the second U-profile surrounds the first U-profile and forms a first connection, but the first U-profile also surrounds a part of the second U-profile, so that a second connection is present. This makes the connection of box and cover plate preferably particularly firm.

Particularly preferably, the first rear gripping device is formed on the box plate and the second rear gripping device on the cover plate. Thus, the rear gripping devices can be arranged in the folding area, without on the broad sides of the box or the cover plate projections caused by folded edge portions of the sheets.

Preferably, a fourth edge region of the box and the cover plate is folded over, wherein on one of the sheets a second receiving groove and on the other of the sheets a in the receiving groove in the direction of insertion insertable second spring is formed. Thus, the door leaf is formed not only on the long sides, but also on both end sides by firm connection of the box and cover plate together.

Advantageously, the third edge region is folded over to a third U-profile having a first straight leg, a receiving leg and a third web therebetween, wherein the first receiving groove is formed on a second envelope on the receiving leg, wherein the fourth edge region to a fourth U-profile is folded over with a spring leg, a second straight leg and a fourth bridge between them, wherein the second spring is formed by the spring leg.

Thus, envelopes are provided on one of the sheets on the third and fourth edge region, which advantageously increase the stability of the connection in the fold region. The U-profiles are here preferably designed in a straight line, i. the legs of the U-profiles are arranged substantially parallel to each other. Thus, it is preferably prevented that an entanglement occurs during the pushing together of the box and cover sheet and prevents complete telescoping of the sheets.

Fig. 1

einen Horizontalschnitt durch ein Türblatt;

Fig. 2

einen Vertikalschnitt durch das Türblatt;

Fig. 3

ein Kastenblech zum Bilden des Türblatts;

Fig. 4

ein Deckelblech zum Bilden des Türblatts;

Fig. 5

das Kastenblech aus Fig. 3 mit eingebrachten Verstärkungen;

Fig. 6

das Kastenblech aus Fig. 5 mit Kleberschicht;

Fig. 7

das Kastenblech aus Fig. 6 mit auf die Kleberschicht aufgelegter Isoliereinlage,

Fig. 8

das Kastenblech aus Fig. 7 mit einer auf die Isoliereinlage aufgebrachten weiteren Kleberschicht sowie das Deckelblech aus Fig. 4;

Fig. 9

das Türblatt mit teilweise zusammengeschobenem Kastenblech und Deckelblech;

Fig. 10

das Türblatt mit fast vollständig zusammengeschobenem Deckelblech und Kastenblech;

Fig. 11

das Türblatt aus Fig. 1 mit vollständig zusammengeschobenem Kasten- und Deckelblech; und

Fig. 12

einen Längsschnitt durch das Türblatt in der Situation der Fig. 10.

An embodiment of the invention will be explained in more detail with reference to the accompanying drawings. It shows:

Fig. 1

a horizontal section through a door leaf;

Fig. 2

a vertical section through the door leaf;

Fig. 3

a box panel for forming the door panel;

Fig. 4

a lid sheet for forming the door panel;

Fig. 5

the box sheet Fig. 3 with added reinforcements;

Fig. 6

the box sheet Fig. 5 with adhesive layer;

Fig. 7

the box sheet Fig. 6 with an insulating insert applied to the adhesive layer,

Fig. 8

the box sheet Fig. 7 with a further adhesive layer applied to the insulator insert and the cover plate Fig. 4 ;

Fig. 9

the door leaf with partially pushed together sheet metal and cover sheet;

Fig. 10

the door leaf with almost completely pushed together cover plate and box sheet;

Fig. 11

the door leaf off Fig. 1 with completely pushed together box and cover plate; and

Fig. 12

a longitudinal section through the door leaf in the situation of Fig. 10 ,

Fig. 1 shows a cross section (horizontal section) through a door leaf 10. The door leaf 10 has a box plate 12 and a cover plate 14, which are connected to each other at two parallel edge portions 16, 18. The first edge regions 16 and the second edge regions 18 are each folded over in order to form rear gripping devices 20, 21. Since the rear engagement means 20, 21 at the first edge region 16 symmetrically to the rear engagement means 20, 21 at In the following, only the rear engagement devices 20, 21 on the first edge region 16 are described below.

The box plate 12 is folded over to form a box 22 and further comprises at its first edge portion 16, which is formed on a hinge side 23, by crimping a first U-profile 24. The first U-profile 24 is defined by an inner leg 26, an outer leg 28 and a first web 30 therebetween. The outer leg 28 of the first U-profile 24 is angled relative to the first web 30 by more than 90 ° and thus aligned obliquely in the direction of the inner leg 26.

The cover plate 12 is angled to form a lid 32 and has at its first edge region 16 by bending a second U-profile 34. The second U-profile 34 is defined by an upper leg 36, a lower leg 38 and a second web 40 therebetween. The lower leg 38 has an angled portion 42 which is bent inwardly at an angle greater than 90 ° relative to the lower leg 38. Thus, the angled portion 42 is directed toward the upper leg 36 in the interior of the second U-profile 34.

In addition, the lower leg 38 has a first envelope 44, at the end of the bend 42 connects.

The first U-profile 24 and the second U-profile 34 are thus designed such that they can engage behind each other, so that the first U-profile 24, the first rear gripping device 20 and the second U-profile 34, the second rear gripping device 21 is formed. The first U-profile 24 engages with the angled outer leg 28, the bend 42, which is formed on the second U-profile 34. At the same time, the second U-profile 34 with the upper leg 36, the lower leg 38 and the second web 40 surrounds the first web 30 and the outer leg 28 of the first U-profile 24.

The bend 42 and the outer leg 28 are based - in particular under bias - from each other and thus form a close connection of the Box plate 12 with the cover plate 14. This is supported by the oblique course of the two outermost free edge strips (angled 42 and leg 28).

Further, on the door leaf 10 shown, a catch 50 on a longitudinal end face 52, the lock side 53, is provided.

The illustrated embodiment of the rear gripping devices 20, 21, they can interlock and thus connect the box plate 12 with the cover plate 14, while the box plate 12 and the cover plate 14 but remain in the longitudinal direction against each other.

Fig. 2 shows a longitudinal section (vertical section) through the door leaf 10. The longitudinal direction, in which the box plate 12 and the cover plate 14 against each other are displaceable, is indicated by an arrow.

At a third edge region 54, the box plate 12 and the cover plate 14 are folded over in such a way that a first tongue and groove connection 56 is formed. For this purpose, a first receiving groove 58 is formed on the cover plate 14 on the third edge region 54.

The third edge region 54 of the cover plate 14 is folded over to form a third U-profile 60 and has a first straight leg 62, a receiving leg 64 and a third web 66 therebetween. The receiving leg 64 is provided with a second envelope 68 for forming the first receiving groove 58. At the end of the second envelope 68, the first receiving groove 58 is formed by further refolding of the receiving leg 64. The receiving groove 58 has an upper groove leg 70 which extends bent toward the first straight leg 62.

The box plate 12 is angled in the third edge region 54 substantially perpendicular to form a first spring 72. This first spring 72 is at mutually moving the box plate 12 to the cover plate 14 in the inserted first receiving groove 58, so that in the third edge portion 54, a connection between the box plate 12 and cover plate 14 is formed. Due to the special shape of the upper groove leg 70, this upper groove leg 70 pushes the first spring against the second envelope 68 and holds it firmly in position.

At a fourth edge portion 74 of box plate 12 and cover plate 14, a second tongue and groove connection 76 is formed. For this purpose, the cover plate 14 is folded over in the fourth edge region 74 to form a second receiving groove 78.

The second receiving groove 78 is formed on a third envelope 80 on the fourth edge region 74 of the cover plate 14. A lower groove leg 82 is substantially parallel to the third envelope 80 and thus not kinked like the upper groove leg 70 to keep the inserted spring clamped.

The box panel 12 is folded over to form a second spring 84 in the fourth edge region 74 to form a fourth U-profile 86. The fourth U-profile 86 in this case has a spring leg 88, a second straight leg 90 and a fourth web 92 in between. The second straight leg 90 and the spring leg 88 extend substantially parallel, with the spring leg 88 forming the second spring 84.

On the box panel 12, a receiving area 93 is formed by bending, in which a smoke protection seal (not shown) can be inserted.

When moving against each other of the box plate 12 to the cover plate 14, the second spring 84 is inserted into the second receiving groove 78, so that in the fourth edge portion 74, the box plate 12 and the cover plate 14 are firmly connected.

Due to the particular configuration of the first and second rear engagement devices 20, 21 and the two tongue and groove connections 56, 76, the box plate 12 and the cover plate 14 can be arranged in a circumferential manner Door rabbets 94 may be arranged. They are so protected and not visible from the outside. At the same time, the box plate 12 and the cover plate 14 remain mutually displaceable, so that in a manufacturing process, only the edge portions 16, 18, 54, 74 must be folded over and then the box and cover plate 12, 14 are simply connected by moving against each other. Another step for connecting box panel 12 and cover plate 14 in one of the edge regions 16, 18, 54, 74 is omitted and the method is so particularly simple and inexpensive.

In the Fig. 3 to 11 Individual steps for producing the door leaf 10 are shown.

In a first step, presented in Fig. 3 , the box panel 12 described above is provided with the already formed first rear engagement means 20 on the parallel longitudinal end faces 52, namely the first and second edge areas 16, 18. Furthermore, the second spring 84 is also already formed on a lower end side 96, the fourth edge region 74, and the first spring 72 on an upper end side 98, the third edge region 54. On one of the longitudinal end faces 52 first recesses 100 are provided for lock pockets (not shown). On the opposite longitudinal side face 52 second recesses 102 for bands and securing bolts (not shown) are provided.

In a further step, presented in Fig. 4 , the cover sheet 14 described above is provided. Also, the cover plate 14 is correspondingly provided on the longitudinal end faces 52 with the second rear engagement means 21 and has on the upper end face 98, the first receiving groove 58 and on the lower end face 96, the second receiving groove 78. It also has the first recesses 100 and the second recesses 102 for inserting lock and straps (not shown).

In a third step, shown in Fig. 5 , in the box plate 12 reinforcements 104 for the lock pocket, the bands and the safety bolts (not shown) introduced. Thereafter, an adhesive layer 106 according to FIG Fig. 6 applied and according to Fig. 7 an insulating insert 108 placed in the box plate 12 on the adhesive layer 106.

In Fig. 8 It is shown that an adhesive layer 106 is again applied to the insulating insert 108. The cover plate 14 is applied with its fourth edge region 74 to the third edge region 54 of the box plate 12. The rear gripping devices 20, 21 engage with each other. Along the arrow shown now the cover plate 14 is moved against the box plate 12.

In Fig. 9 a position is shown in which the cover plate 14 is pushed to a third over the box plate 12. This is readily possible by the formation of the first and second engagement devices 20, 21. The shape of the cross section of the door leaf 10 and the longitudinal section of the door leaf 10 are in Fig. 9 indicated by dashed lines.

The cover plate 14 is in 10 and 11 further along the arrow direction shown on the box plate 12 is moved until it is completely above the box plate 12. In this case, the first and second engagement devices 20, 21 are engaged, as well as the first spring 72 is inserted into the first receiving groove 58 and the second spring 84 in the second receiving groove 78.

In Fig. 10 the situation is shown when the cover plate 14 is almost completely pushed together with the box plate 12.

Fig. 12 shows a longitudinal section through the door leaf 10 in the situation of Fig. 10 ,

The cover plate 14 is almost completely pushed over the box plate 12. The rear gripping means 20, 21 are engaged while, however, the first and second springs 72, 84 are not yet inserted into the first and second receiving grooves 58, 78. If the cover plate 14 is pushed further in the direction of the arrow on the box plate 12, the first and second spring 72, 84 are inserted into the first and second receiving groove 58, 78. The first spring 72 is through the kinked formation of the upper Nutschenkels 70 firmly pressed into the first receiving groove 58.

• Bei dem Verfahren zum Herstellen des Türblatts 10 sind lediglich zwei Hauptschritte nötig, nämlich zuerst das Umfälzen der vier Randbereiche 16, 18, 54, 74 an Kastenblech 12 und Deckelblech 14 und danach das Zusammenschieben von Kastenblech 12 und Deckelblech 14. Weitere Umfälzschritte nach dem Zusammenschieben der beiden Bleche 12, 14 sind nicht mehr nötig.

The described door leaf has the following advantages:

• In the method for producing the door leaf 10, only two main steps are necessary, namely first the crimping of the four edge regions 16, 18, 54, 74 on box plate 12 and cover plate 14 and then pushing together box plate 12 and cover plate 14. Further Umfälzschritte after pushing together the two sheets 12, 14 are no longer necessary.

LIST OF REFERENCE NUMBERS

10

door leaf

12

box sheet

14

cover sheet

16

first edge area

18

second border area

20

first rear gripping device

21

second rear gripping device

22

box

23

hinge side

24

first U-profile

26

inner thigh

28

outer thigh

30

first jetty

32

cover

34

second U-profile

36

upper leg

38

lower thigh

40

second bridge

42

angling

44

first envelope

50

Catches

52

longitudinal side

53

lock side

54

third edge area

56

first tongue and groove connection

58

first recording groove

60

third U-profile

62

first straight leg

64

receiving arms

66

third jetty

68

second envelope

70

upper groove leg

72

first spring

74

fourth edge area

76

second tongue and groove connection

78

second receiving groove

80

third envelope

82

lower groove leg

84

second spring

86

fourth U-profile

88

spring leg

90

second straight leg

92

fourth bridge

93

reception area

94

door rebate

96

lower front side

98

upper end side

100

first recesses

102

second recesses

104

reinforcements

106

adhesive layer

108

insulating insert

Claims (14)

Method for producing a rebated door leaf (10) made of metal sheets in box and lid construction, with the steps: a) providing a box plate (12) and a cover plate (14) for forming the box (22) and lid (14); b) Umfälzen of two parallel edge regions (16, 18) on corresponding parallel edges of the box plate (12) and the cover plate (14) to each other in the longitudinal direction of the edge regions (16, 18) slidably engaging behind engaging means (20, 21) within two parallel To form door rabbet (94); c) crimping at least a third edge region (54) of the box plate (12) and cover plate (14), so that on one of the sheets (12, 14) has a receiving groove (58) and on the other of the sheets (12, 14) an in the receiving groove (58) insertable in the direction of displacement spring (72) is formed; d) joining the box plate (12) and cover plate (14) by hooking the rear gripping means (20, 21) and moving until the spring (72) engages in the receiving groove (58). A method according to claim 1, characterized by refolding a fourth edge region (74) of box plate (12) and cover plate (14), so that on one of the sheets (12, 14) has a second receiving groove (78) and on the other of the sheets (12 , 14) is formed in the second receiving groove (78) insertable in the direction of displacement second spring (84). A method according to claim 1 or 2, characterized in that step d) at least one of the steps d1) applying an adhesive layer (106) to the box panel (12) between the folded four edge portions (16, 18, 54, 74); d2) inserting an insulating insert (108) onto the adhesive layer (106); and or d3) applying an adhesive layer (106) to the insulating insert (108); having. Door leaf (10) with a box and a cover plate (12, 14), wherein at two parallel edge regions (16, 18) at corresponding parallel edges of the box and cover plate (12, 14) in the longitudinal direction of the edge regions (16, 18 ) and in which at a third edge region (54) of one of the sheets (12, 14) has a receiving groove (58) and at the other of the sheets (12, 14) into the receiving groove (58 ) in the direction of insertion insertable spring (72) is formed. Door leaf (10) according to claim 4, characterized in that a first rear gripping device (20) as a first U-profile (24) with an inner leg (26), an outer leg (28) and a first web (30) is formed therebetween , Door leaf (10) according to claim 5, characterized in that the outer leg (28) is angled at an angle greater than 90 ° to the first web (30). Door leaf (10) according to one of claims 4 to 6, characterized in that a second rear gripping device (21) for gripping around the first rear gripping device (20) is formed. Door leaf (10) according to claim 7, characterized in that the second rear gripping device (21) as a second U-profile (34) having an upper leg (36), a lower leg (38) and a second web (40) is formed therebetween , wherein on the lower leg (38) an angled portion (42) is formed by more than 90 ° inwards. Door leaf (10) according to claim 8, characterized in that the angled portion (42) has the same angle as the angle between the first web (30) and the outer leg (28). Door leaf (10) according to one of claims 8 or 9, characterized in that the angled portion (42) on an envelope (44) of the lower leg (38) is formed. Door leaf (10) according to one of claims 8 to 10, characterized in that the first U-profile (24) for gripping around the bend (42) is formed. Door leaf (10) according to one of claims 4 to 11, characterized in that the first rear gripping device (20) on the box plate (12) and the second rear gripping device (21) on the cover plate (14) is formed. Door leaf (10) according to one of claims 4 to 12, characterized in that a fourth edge region (74) of the box and the cover plate (12, 14) is folded over, wherein on one of the sheets (12, 14) has a second receiving groove ( 78) and on the other of the sheets (12, 14) in the second receiving groove (78) insertable in the direction of displacement second spring (84) is formed. Door leaf (10) according to claim 13, characterized in that the third edge region (54) umgefälzt to a third U-profile (60) having a first straight leg (61), a receiving leg (64) and a third web (66) therebetween wherein the first receiving groove (58) on a second envelope (68) on the receiving leg (64) is formed, wherein the fourth edge region (74) to a fourth U-profile (86) with a spring leg (88), a second straight leg (90) and a fourth web (92) is folded over therebetween, wherein the second spring (84) by the spring leg (88) is formed.

Images