DE102010044195A1 - Method for producing a rebated door leaf and door leaf - Google Patents

Abstract

The invention relates to a method for producing a rebated door leaf (10) made of sheet metal in box and lid construction, wherein a box plate (12) and a cover plate (14) by interlocking of rear gripping means (20, 21) and moving until a spring (72 ) engages in a receiving groove (58), are joined together. Furthermore, the invention relates to a door leaf (10) which is produced by the described method.

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 springs which engage in the groove, wherein at the end of the springs hooks are provided which engage in the assembly of the box and lid in the 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 construction for To provide, 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.

• a) Bereitstellen eines Kastenbleches und eines Deckelbleches zum Bilden von Kasten und Deckel;
• 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;
• 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;
• d) Zusammenfügen von Kastenblech und Deckelblech durch Ineinanderhaken der Hintergreifeinrchtungen 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:

• a) providing a box plate and a cover plate for forming box and lid;
• 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;
• 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;
• d) joining the box plate and cover sheet by hooking the Hintergreifeinrchtungen and sliding 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 be placed on the box plate and the two sheets are interconnected by moving against each other just after already carried out Umfälzen the edge regions of the cover sheet. Advantageously, can be dispensed with further forming steps. For example, further refolding 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 joining the sheets z. B. by refolding of the sheets available, preferably such 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

on.

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 two parallel edge areas corresponding parallel edges of the box and cover plate on each other in the longitudinal direction of the edge regions slidably engaging behind engagement devices, wherein on a third edge region of the sheet a receiving groove and on the other of the sheets a insertable into the receiving groove in the direction of displacement 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. This bend can be easily 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 resulting on the broad sides of the box or the cover plate projections by folded edge areas 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 rectilinear, d. H. 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.

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

1 a horizontal section through a door leaf;

2 a vertical section through the door leaf;

3 a box panel for forming the door panel;

4 a lid sheet for forming the door panel;

5 the box sheet 3 with added reinforcements;

6 the box sheet 5 with adhesive layer;

7 the box sheet 6 with applied on the adhesive layer insulating insert;

8th the box sheet 7 with a further adhesive layer applied to the insulator insert and the cover plate 4 ;

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

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

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

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

1 shows a cross section (horizontal section) through a door leaf 10 , The door leaf 10 has a box sheet 12 as well as a cover plate 14 on, each at two parallel edge areas 16 . 18 connected to each other. The first edge areas 16 as well as the second border areas 18 are each folded over to rear gripping devices 20 . 21 to build. Because the rear grip devices 20 . 21 at the first edge area 16 symmetrical to the Hintergreifeinrichtungen 20 . 21 at the second edge area 18 is formed, hereinafter only the Hintergreifeinrichtungen 20 . 21 at the first edge area 16 described.

The box sheet 12 is to make a box 22 folded over and points further to its first edge area 16 who is on a band side 23 is formed by Umfälzung a first U-profile 24 on. The first U-profile 24 is through an inner thigh 26 , an outer thigh 28 as well as a first jetty 30 defined in between. The outer thigh 28 of the first U-profile 24 is relative to the first jetty 30 angled more than 90 ° and thus towards the inner thigh 26 aligned tapered.

The cover sheet 12 is to make a lid 32 angled and facing at its first edge area 16 by bending a second U-profile 34 on. The second U-profile 34 is through an upper thigh 36 , a lower leg 38 and a second jetty 40 defined in between. The lower thigh 38 has an angling 42 on, relative to the lower leg 38 bent inwards at an angle of more than 90 °. Thus, the bend is 42 on the upper thigh 36 towards the inside of the second U-profile 34 directed.

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

The first U-profile 24 and the second U-profile 34 are thus designed so 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 formed. The first U-profile 24 surrounds it with the angled outer thigh 28 the bend 42 attached to the second U-profile 34 is formed. At the same time, the second U-profile surrounds 34 with the upper thigh 36 , the lower leg 38 as well as the second bridge 40 the first jetty 30 and the outer thigh 28 of the first U-profile 24 ,

The bend 42 as well as 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 sheet 14 , This is due to the oblique course of the two outermost free edge strips (bend 42 and thighs 28 ) supported.

Next is on the door leaf shown 10 a flycatcher 50 on a longitudinal end face 52 , the castle side 53 , intended.

The illustrated embodiment of the rear gripping devices 20 . 21 , these can mesh and thus the box plate 12 with the cover sheet 14 connect, at the same time remain the box sheet 12 and the cover sheet 14 However, in the longitudinal direction against each other.

2 shows a longitudinal section (vertical section) through the door leaf 10 , The longitudinal direction in which the box sheet 12 and the cover sheet 14 are mutually displaceable, indicated by an arrow.

At a third edge area 54 are the box sheet 12 and the cover sheet 14 folded so that a first tongue and groove connection 56 arises. This is on the cover plate 14 at the third edge area 54 a first recording groove 58 educated.

The third edge area 54 of the cover plate 14 is to a third U-profile 60 folded over and has a first straight leg 62 , a receiving leg 64 and a third jetty 66 in between. The receiving leg 64 is to make the first pickup groove 58 with a second envelope 68 Mistake. At the end of the second envelope 68 is by further refolding of the receiving leg 64 the first recording groove 58 educated. The receiving groove 58 has an upper groove leg 70 up to the first straight thigh 62 bent down.

The box sheet 12 is in the third border area 54 substantially perpendicular to form a first spring 72 angled. This first spring 72 is when moving against each other of the box plate 12 to the cover plate 14 in the first recording groove 58 pushed in, so even in the third edge area 54 a connection between box sheet 12 and cover sheet 14 arises. Due to the special shape of the upper groove leg 70 pushes this upper groove leg 70 the first spring against the second envelope 68 and hold her firmly in position.

At a fourth edge area 74 from box sheet 12 and cover sheet 14 is a second tongue and groove connection 76 educated. This is the cover plate 14 in the fourth border area 74 for forming a second receiving groove 78 umgefälzt.

The second recording groove 78 is on a third envelope 80 at the fourth edge area 74 of the cover plate 14 educated. A lower groove leg 82 runs essentially parallel to the third envelope 80 and thus not like the upper groove leg 70 kinked to keep the inserted spring clamped.

The box sheet 12 is to form a second spring 84 in the fourth border area 74 to a fourth U-profile 86 umgefälzt. The fourth U-profile 86 has a spring leg 88 , a second straight leg 90 and a fourth jetty 92 in between. The second straight thigh 90 and the spring leg 88 are substantially parallel, the spring leg 88 the second spring 84 forms.

At the box sheet 12 is by bending an intake area 93 formed, 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 becomes the second spring 84 in the second receiving groove 78 pushed in, so that even in the fourth edge area 74 the box sheet 12 and the cover sheet 14 are firmly connected.

Due to the special configuration of the first and second engagement devices 20 . 21 as well as the two tongue and groove connections 56 . 76 can the box sheet 12 and the cover sheet 14 in circumferentially arranged door rabbet 94 be arranged. They are so protected and not visible from the outside. At the same time remain the box plate 12 and the cover sheet 14 mutually displaceable, so that in a manufacturing process, only the edge areas 16 . 18 . 54 . 74 must be folded over and then the box and cover plate 12 . 14 simply be connected by moving against each other. Another step to connect box panel 12 and cover sheet 14 in one of the border areas 16 . 18 . 54 . 74 eliminates and the process is so easy and inexpensive.

In the 3 to 11 are individual steps for making the door leaf 10 shown.

In a first step, presented in 3 , becomes the box sheet described above 12 with the already formed first Hintergreifeinrichtungen 20 at the parallel longitudinal sides 52 namely, the first and second border areas 16 . 18 , made available. Next is already the second spring 84 on a lower front side 96 , the fourth border area 74 , as well as the first spring 72 on an upper front side 98 , the third border area 54 , educated. On one of the long sides 52 are first recesses 100 for lock pockets (not shown). On the opposite longitudinal side front side 52 are second recesses 102 for bands and securing bolts (not shown).

In a further step, presented in 4 , becomes the cover sheet described above 14 made available. Also the cover plate 14 is corresponding to the longitudinal end faces 52 with the second rear gripping devices 21 provided and has at the upper end face 98 the first recording groove 58 and at the lower end 96 the second receiving groove 78 on. It also has the first recesses 100 and the second recesses 102 for introducing lock and straps (not shown).

In a third step, shown in 5 , get into the box sheet 12 reinforcements 104 for the lock pocket, the straps and the securing bolts (not shown). After that, on the box plate 12 an adhesive layer 106 according to 6 applied and according to 7 an insulating insert 108 in the box sheet 12 on the adhesive layer 106 hung up.

In 8th is shown on the insulating insert 108 again an adhesive layer 106 is applied. The cover sheet 14 comes with its fourth edge area 74 to the third edge area 54 of the box sheet 12 created. The rear grip devices 20 . 21 intervene. Along the arrow shown is now the cover plate 14 against the box sheet 12 postponed.

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

The cover sheet 14 is in 10 and 11 continue along the arrow shown on the box sheet 12 until it is completely over the box sheet 12 lies. Here are the first and second engagement devices 20 . 21 engaged, as well as the first spring 72 in the first recording groove 58 and the second spring 84 in the second receiving groove 78 inserted.

In 10 the situation is illustrated when the cover sheet 14 almost completely with the box sheet 12 pushed together.

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

Here is the cover plate 14 almost completely over the box sheet 12 pushed. The rear grip devices 20 . 21 are engaged, however, while the first and second spring 72 . 84 not yet in the first and second receiving groove 58 . 78 are inserted. Will the cover sheet 14 continue in the direction of the arrow over the box panel 12 pushed, become the first and second spring 72 . 84 in the first and second receiving groove 58 . 78 inserted. The first spring 72 is due to the kinked formation of the upper groove leg 70 firmly in the first receiving groove 58 pressed.

The described door leaf has the following advantages:
In the method of manufacturing the door panel 10 Only two main steps are necessary, namely first the refolding of the four edge areas 16 . 18 . 54 . 74 on box sheet 12 and cover sheet 14 and then the pushing together of box sheet 12 and cover sheet 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

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19934680 C2 [0003]
• DE 102005023426 B3 [0004]
• DE 102008056502 A1 [0005]
• WO 82-04281 [0006]
• GB 2254872 A [0007]
• DE 3534233 A1 [0008]
• US 1848715 [0008]
• DE 3520500 A1 [0008]
• DE 2811142 A1 [0008]
• DE 2437261 A1 [0009]
• EP 0989277 A2 [0010]
• CH 365519 [0011]

Claims (14)

Method for producing a rebated door leaf ( 10 ) in box and lid metal sheets, comprising the steps of: a) providing a box sheet ( 12 ) and a cover plate ( 14 ) to make box ( 22 ) and lid ( 14 ); b) refolding of two parallel edge regions ( 16 . 18 ) at corresponding parallel edges of the box ( 12 ) and the cover plate ( 14 ) to each other in the longitudinal direction of the edge regions ( 16 . 18 ) slidably engaging behind engaging devices ( 20 . 21 ) within two parallel door rabbets ( 94 ) to build; c) refolding at least one third edge region ( 54 ) of box sheet ( 12 ) and cover sheet ( 14 ), so that on one of the sheets ( 12 . 14 ) a receiving groove ( 58 ) and on the other of the sheets ( 12 . 14 ) one in the receiving groove ( 58 ) in the direction of insertion insertable spring ( 72 ) arises; d) joining boxboard ( 12 ) and cover sheet ( 14 ) by hooking the Hintergreifeinrichtungen ( 20 . 21 ) and move until the spring ( 72 ) in the receiving groove ( 58 ) intervenes. Method according to Claim 1, characterized by refolding a fourth edge region ( 74 ) of box sheet ( 12 ) and cover sheet ( 14 ), so that on one of the sheets ( 12 . 14 ) a second receiving groove ( 78 ) and on the other of the sheets ( 12 . 14 ) one in the second receiving groove ( 78 ) insertable in the direction of displacement second spring ( 84 ) arises. 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 ) on the box sheet ( 12 ) between the folded four edge regions ( 16 . 18 . 54 . 74 ); d2) inserting an insulating insert ( 108 ) on the adhesive layer ( 106 ); and / or d3) applying an adhesive layer ( 106 ) on the insulating insert ( 108 ); having. Door leaf ( 10 ) with a box and a cover plate ( 12 . 14 ), whereby at two parallel edge regions ( 16 . 18 ) at corresponding parallel edges of the box and cover plate ( 12 . 14 ) each other in the longitudinal direction of the edge regions ( 16 . 18 ) slidably engaging behind engaging devices ( 20 . 21 ) are formed and wherein at a third edge region ( 54 ) one of the sheets ( 12 . 14 ) a receiving groove ( 58 ) and on the other of the sheets ( 12 . 14 ) one in 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 the first U-profile ( 24 ) with an inner leg ( 26 ), an outer leg ( 28 ) and a first bridge ( 30 ) is formed therebetween. Door leaf ( 10 ) according to claim 5, characterized in that the outer leg ( 28 ) at an angle greater than 90 ° to the first web ( 30 ) is angled. Door leaf ( 10 ) according to one of claims 4 to 6, characterized in that a second rear gripping device ( 21 ) for grasping the first rear gripping device ( 20 ) is trained. Door leaf ( 10 ) according to claim 7, characterized in that the second rear engagement device ( 21 ) as a second U-profile ( 34 ) with an upper leg ( 36 ), a lower leg ( 38 ) and a second bridge ( 40 ) is formed therebetween, wherein on the lower leg ( 38 ) an angling ( 42 ) is formed more than 90 ° inwards. Door leaf ( 10 ) according to claim 8, characterized in that the bend ( 42 ) the same angle as the angle between the first bridge ( 30 ) and the outer leg ( 28 ) having. Door leaf ( 10 ) according to one of claims 8 or 9, characterized in that the bend ( 42 ) on an envelope ( 44 ) of the lower thigh ( 38 ) is trained. Door leaf ( 10 ) according to one of claims 8 to 10, characterized in that the first U-profile ( 24 ) for embracing the bend ( 42 ) is trained. Door leaf ( 10 ) according to one of claims 4 to 11, characterized in that the first rear engagement device ( 20 ) on the box panel ( 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 sheet ( 12 . 14 ) is folded over, wherein on one of the sheets ( 12 . 14 ) a second receiving groove ( 78 ) and on the other of the sheets ( 12 . 14 ) one 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 area ( 54 ) to a third U-profile ( 60 ) with a first straight leg ( 61 ), a receiving leg ( 64 ) and a third bridge ( 66 ) is folded over in between, wherein the first receiving groove ( 58 ) on a second envelope ( 68 ) on the receiving leg ( 64 ), wherein the fourth edge region ( 74 ) too a fourth U-profile ( 86 ) with a spring leg ( 88 ), a second straight leg ( 90 ) and a fourth bridge ( 92 ) is folded over between them, the second spring ( 84 ) by the spring leg ( 88 ) is formed.

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