EP4411097A1 - Connection of a pvc window frame with aluminium facing shells or frames - Google Patents

Abstract

A composite frame for a window or a door comprises an outer front frame made of metal profiles connected to one another in the corner area or at least one outer metal front shell (2, 3), a base frame made of plastic profiles (5, 6) welded to one another in the miter area, wherein the outer front frame or the at least one outer metal front shell (2, 3) is connected to the base frame via connecting clips (1). The connecting clip (1) has an at least approximately flat plate (7) with spreading springs (8, 9) arranged at a distance on both sides of the plate (7). An elastic spring (10) is arranged on one side of the plate (7). Bores (12, 13) are arranged in the outer surfaces (14, 15) of the plastic profiles (5, 6). The metal profiles or outer metal front shells (2, 3) are connected to the plastic profiles (5, 6) by means of the connecting clips (1).

Description

The invention relates to a connection of a PVC window frame with aluminum facings or frames.

Technical area

Plastic has become the material used in many markets for frame profiles for the manufacture of windows and doors due to the efficient processing and durability of the products. Plastic profiles are generally mitred and welded together in the mitred area to form a frame. At least for larger processors, the manufacture of window and sash frames from plastic profiles is usually carried out on complex production lines in which the individual work steps are carried out one after the other in a timed manner. In order to enable efficient production, none of the individual work steps may take significantly longer than other work steps, as otherwise the entire production line would have to be operated at a correspondingly slower speed.

The use of facings or frames made of metal profiles, and in particular aluminum profiles, is well known for both wooden and plastic windows. The covering of plastic profiles with aluminum facings or frames is primarily done for aesthetic reasons, whereby the aluminum facings or frames can be anodized, painted or otherwise coated in different colors.

State of the art

Connecting clips are known in which a spreading spring is arranged on one side; this is attached to a plastic or wooden profile, preferably glued. Furthermore, there is a hole in the connecting clip through which a screw with preferably a sharp tip and sharp-edged A thread is inserted to screw the connecting clip to the base body. This means that the connecting clip is rigidly connected to the base body. This requires very precise manufacturing during assembly. If at least 3 connecting clips are involved in assembling an aluminum profile, they must be arranged as precisely as possible in a straight line. In order to compensate for deviations from this, the connection between the connecting clips and the shells must have corresponding tolerances. The same applies to displacements due to thermal expansion, as the shells and the plastic or wooden profiles have different thermal expansion coefficients.

Out of DE 7935702 U1 A plastic window with light metal cover profiles attached to the outside is known. The connection is made using retaining clips, which engage in the plastic profiles or cover profiles via locking tongues and anchoring claws. Both the locking tongues and the anchoring claws have flat surfaces, which engage in parallel. This means that only straight-line sliding is possible.

DE 3912135 A1 shows clip connectors for fixing metal profiles to wooden frames that are fixed at a fixed height. The clip connectors are inserted into a groove on both sides. The fixing points to the wooden frame on one side and to the metal profile on the other side are arranged on a straight line. If the grooves are straight, the two parts to be connected are aligned along this straight line.

Out of DE 7904496 U1 A wooden frame with a metal frame is known. A connector allows for twisting, so that only two connectors can be aligned. However, if there are three connectors that are not screwed in a line, this cannot be compensated.

DE 19949145 C1 discloses a window or door frame with a rotatable connecting element which has a toothing into which a tool with a corresponding toothing engages. The connector also has an inclined surface. The connector can be rotated using the tool so that a force-fit connection is created using the inclined surface.

US10030435B2 discloses a door with a plastic frame in which panels are used instead of a glass pane. An inner panel is connected to a holder on the side facing away from the building and is thus clamped over the overlap.

WO 2004/087340 A2 shows a connector for doors and windows, which can be inserted into a slot with a central, larger round opening and moved horizontally, whereby the connector is firmly fixed in the two edge areas of the narrow slot.

Task

The object of the present invention is therefore to provide a generic composite frame for a window or a door with a base frame made of plastic profiles in conjunction with metal profiles for covering the plastic profiles, in which manufacturing tolerances can be compensated for in the combination.

Description of the invention

The invention solves this problem by a composite frame according to independent claim 1 and a connecting clip according to independent claim 11.

A composite frame according to the invention for a window or a door comprises a base frame made of welded plastic profiles and an outer front frame made of metal profiles connected to one another in the corner area or, alternatively, at least one outer metal front shell. As a rule, all plastic profiles of the base frame are covered with metal on the outside. The front frames or front shells each have an outer front surface which, in the installed position, runs vertically towards the outside of the building. The base frame also has a plastic profile outer surface which, in the installed position, runs vertically towards the outside of the building. The outer front frame or the at least one outer metal front shell are connected to the base frame via connecting clips.

According to the invention, this is done using a connecting clip that engages in the base profile via holes and is connected to locking grooves in the outer front frame or the at least one outer metal front shell. This allows a firm connection that can compensate for manufacturing tolerances as well as heat-related movements. The outside in particular is subject to large temperature fluctuations, so that tensions can arise due to the different thermal expansion coefficients between mostly PVC and aluminum.

The connecting clip has a plate that is at least approximately flat; this is usually completely flat, but it can also be grooved or slightly curved.

A spreading spring is arranged on both sides of the plate, which does not include the plate edges. The two spreading springs are spaced apart by a certain distance a. An elastic spring is arranged on one side of the plate, whereby the elastic spring is connected to the plate via a web and the elastic spring leads away from the web and approaches the plane of the plate up to a certain distance b. This means that the distance between the elastic spring and the Plate tends to decrease starting from the web. It is unimportant whether the spring runs in the other direction again at the end to make it easier to thread it in. The web is arranged at a distance c from the second spreading spring.

Holes are arranged in the outer surfaces of the plastic profiles at least approximately at a distance c. The description of the exemplary embodiment explains how large a deviation from the exact distance a or c can be. The metal profiles or outer metallic facings have locking grooves on the side opposite the outer surfaces of the facings. Since the metal profiles are usually extruded profiles, the locking grooves run in the direction of extrusion. The connecting clips are connected via the web in connection with the elastic spring and the second spreading spring on the side of the elastic spring by clipping through the holes. Furthermore, the connecting clips are connected to the metal profiles or outer metallic facings via the locking grooves on the side facing away from the elastic spring.

Advantageous embodiments result from the features of the dependent claims.

According to a preferred embodiment of the invention, the distance b is at least somewhat smaller than the wall thickness of the outer surface of the plastic profile. This ensures that after the connecting clip has been inserted, it is elastically clamped to the plastic profile by the elastic deformation.

Advantageously, the first bore and the elastic spring as well as the web are matched to each other in such a way that the elastic spring with the web can pass through the first bore with play This makes assembly easier. The clearance is preferably 1 to 3 mm.

Optionally, the second hole and second expansion spring are matched to each other in such a way that the second expansion spring can be guided through the second hole when compressed and, after insertion, the second expansion spring rests under elastic tension in the second hole. This ensures a firm fit.

The second expansion spring advantageously has a through-hole. After being inserted into the second hole, the second expansion spring can then be fixed in the through-hole using a screw, as the second expansion spring can then no longer be compressed and the connecting clip cannot jump out of the hole under tension.

Preferably, the first spreading spring and the locking grooves are coordinated with one another in such a way that the first spreading spring can be inserted into the locking grooves in the compressed state and, after insertion, the first spreading spring rests in the locking groove under elastic tension.

In a preferred embodiment, the first and/or second expansion springs have at least approximately a rotationally symmetrical basic structure with slots parallel to the axis of rotation. Due to the rotationally symmetrical basic structure, the expansion springs can be particularly easily inserted into holes that are also rotationally symmetrical.

If the first and second holes have the same diameter, the connecting clip can be inserted in two directions.

Preferably, the distance a is at least approximately equal to the distance c. The first spreading spring and the web which connects the elastic spring to the flat plate are thus equidistant from the second spreading spring and are preferably arranged on an axis opposite one another on the two sides of the plate.

Optionally, the plastic profile inner surface of the plastic profiles opposite the plastic profile outer surface can also be connected via the connecting clips according to the invention to an inner facing frame made of metal profiles connected to one another in the corner area or to at least one inner metallic facing shell.

A connecting clip according to the invention has an at least approximately flat plate, with a spreading spring arranged on both sides of the plate at a distance a. An elastic spring is arranged on one side of the plate. The elastic spring is connected to the plate via a web and the elastic spring approaches the plane of the plate up to a distance b, leading away from the web.

Short description of the drawing

Fig. 1

ein Schnitt durch einen erfindungsgemäßen Verbundrahmen;

Fig. 2

einen erfindungsgemäßen Verbindungsclip in perspektivischer Ansicht;

Fig. 3

denselben erfindungsgemäßen Verbindungsclip in einer anderen dreidimensionalen Ansicht,

Fig. 4

denselben erfindungsgemäßen Verbindungsclip in der Draufsicht;

Fig. 5

den Verbindungsclip aus Figur 4 in seitlicher Ansicht;

Fig. 6

den Verbindungsclip aus Figur 4 in gegenüberliegender Ansicht;

Fig. 7

den Verbindungsclip aus Figur 4 in Stirnseitenansicht;

Fig. 8

ein Flügelrahmen-Kunststoffprofil vor dem Einsetzen des erfindungsgemäßen Verbindungsclips,

Fig. 9

das Flügelrahmen-Kunststoffprofil aus Figur 8 beim ersten Schritt beim Einsetzen des erfindungsgemäßen Verbindungsclips,

Fig. 10

das Flügelrahmen-Kunststoffprofil aus Figur 8 beim zweiten Schritt beim Einsetzen des erfindungsgemäßen Verbindungsclips,

Fig. 11

das Flügelrahmen-Kunststoffprofil aus Figur 8 nach dem Einsetzen des erfindungsgemäßen Verbindungsclips.

Fig. 12

das Flügelrahmen-Kunststoffprofil mit Verbindungsclips aus Figur 11 nach dem Einsetzen der Schraube und

Fig. 13

einen Schnitt - wie in Figur 1 eingezeichnet - zur Verbindung des Flügelrahmen-Kunststoffprofil mit einer Vorsatzschale mittels des erfindungsgemäßen Verbindungsclips.

The invention is explained in more detail below using embodiments and the drawing. They show:

Fig.1

a section through a composite frame according to the invention;

Fig.2

a connecting clip according to the invention in perspective view;

Fig.3

the same connecting clip according to the invention in another three-dimensional view,

Fig.4

the same connecting clip according to the invention in plan view;

Fig.5

the connecting clip Figure 4 in side view;

Fig.6

the connecting clip Figure 4 in opposite view;

Fig.7

the connecting clip Figure 4 in front view;

Fig.8

a sash plastic profile before inserting the connecting clip according to the invention,

Fig.9

the sash frame plastic profile made of Figure 8 in the first step of inserting the connecting clip according to the invention,

Fig.10

the sash frame plastic profile made of Figure 8 in the second step when inserting the connecting clip according to the invention,

Fig. 11

the sash frame plastic profile made of Figure 8 after inserting the connecting clip according to the invention.

Fig. 12

the sash frame plastic profile with connecting clips made of Figure 11 after inserting the screw and

Fig. 13

a cut - as in Figure 1 shown - for connecting the sash frame plastic profile with a facing shell by means of the connecting clip according to the invention.

The same reference symbols in different figures have the same meaning. Not all reference symbols are shown in all figures.

Figure 1 shows a section through a window or door frame with a sash frame plastic profile 5 and a frame plastic profile 6. Seals 4 are located at the contact points between the sash and frame. Glazing (not shown) is inserted into the rebate in the sash frame.

The frame is connected to the masonry. The window or door frame is inserted in such a way that the sash frame can be opened towards the interior of the building.

Both the cover frame and the sash frame are made of plastic profiles 5, 6 welded together in the mitre area and each have a plastic profile outer surface 14, 15 which, in the installation position, runs vertically towards the outside of the building A.

On the outside of the building A, the sash frame plastic profile 5 and the window frame plastic profile 6 are clad using facing panels 2, 3. Alternatively, facing frames made of metal profiles connected to one another in the corner area can be used. The facing panels 2, 3 are extruded aluminum profiles. The facing panels 2, 3 are designed in such a way that they have facing outer surfaces 16, 17 directed towards the outside of the building A, which, in the installed position, run vertically towards the outside of the building A.

The outer metallic facing shells 2, 3 have locking grooves 18 on the side opposite the facing outer surfaces 16, 17.

The outer facings 2, 3 are connected to the plastic profiles 5, 6 via connecting clips 1. The connecting clip 1 according to the invention, which is in the Figures 2 and 3 perspective and in the Figures 4 to 7 shown in various top views, has a flat plate 7. A first and a second spreading spring 8, 9 are arranged on both sides of the plate 7. The spreading springs 8, 9 are spaced apart by a distance a; this distance a is shown in the Figures 5 and 6 On one side of the plate 7, an elastic spring 10 is arranged at a distance c from the second spreading spring 9, whereby this elastic spring 10 is arranged via a perpendicular to the plate 7 is connected to the plate 7 by a cylindrical web 11. The distance a is the distance between the centers of the first and second spreading springs 8, 9. The distance c is the distance between the center of the second spreading spring 9 and the center of the cylindrical web 11. The elastic spring 10 leads away from the web 11 and approaches the plane of the plate 7 up to a distance b. The distance b is in Figure 5 The distance b is slightly smaller than the wall thickness of the plastic profile outer surface 14, 15. In the example shown, the two distances a and c are the same size; however, this is not mandatory.

The connecting clips 1 are connected to the sash frame plastic profile 5 and the frame plastic profile 6 via the web 11 in conjunction with the elastic spring 10 and the second spreading spring 9 on one side of the plate 7. This is done by clipping through holes 12, 13 in the sash frame plastic profile 5 and the frame plastic profile 6. The holes 12, 13 are particularly in Figure 8 The distance between the two holes 12, 13 corresponds to the distance c between the second spreading spring 9 and the cylindrical web 11.

The connecting clips 1 are also connected to the outer facing shells 2, 3 via first spreading springs 8 on the side facing away from the elastic spring 10 by engaging in the locking grooves 18.

The first bore 12 and the elastic spring 10 as well as the web 11 are coordinated with one another in such a way that the elastic spring 10 with the web 11 can be guided through the first bore 12 with play, preferably 1 to 3 mm.

The second bore 13 and the second spreading spring 9 are matched to each other in such a way that the second spreading spring 9 in the in a compressed state can be guided through the second bore 13 and after insertion the second expansion spring 9 rests under elastic tension in the second bore 13. The connecting clip 1 can be rotated in the second bore 13; this rotational movement is limited by the play of the web 11 in the first bore 12.

In the embodiment, the first hole 12 is exactly the same size as the second hole 13. This means that it is irrelevant in which direction the connecting clip 1 is inserted. Consequently, the elastic spring 10 with the cylindrical web 11 could also be inserted into the second hole 13, while the second expansion spring 9 is inserted into the first hole 12.

The second expansion spring 9 has a through-hole 19. After insertion in the second hole 13, the second expansion spring 9 can be fixed in the through-hole 19 by means of a screw 20; this is shown in Figure 12 shown.

The first spreading spring 8 and the locking grooves 18 are coordinated with one another in such a way that the first spreading spring 8 can be inserted into the locking grooves 18 of the outer metallic front shells 2, 3 in the compressed state and the first spreading spring 8 rests under elastic tension in the locking groove 18 after insertion.

The first and second spreading springs 8, 9 have at least approximately a rotationally symmetrical basic structure with slots parallel to the axis of rotation.

The installation of the connecting clip 1 in the outer surface 14 of the sash frame plastic profile 5 is shown in the Figures 8 to 12 Two holes 12, 13 are arranged in the outer surface 14 of the plastic profile 5 at a distance c. The hole 12 is the same size as the hole 13. The elastic spring 10 and then the web 11 is positioned with play in this hole 12. This means that the hole 12 must have a larger diameter than the web 11, which is round in this embodiment. In the assembled state, the connecting clip 1 is rotatably connected to the sash frame plastic profile 5 via the second spreading spring 9 in connection with the second hole 13 and with play via the web 11 in connection with the elastic spring 10 with the first hole 12. This enables the web 11 to move in the first hole both in the extension direction of the sash frame plastic profile 5 and in the vertical direction.

Figure 8 shows the outer surface 14 of a sash frame plastic profile 5. In the outer surface 14 of the plastic profile 5, two holes 12, 13 are arranged at a distance c, ideally on the same horizontal level.

Figure 9 to Fig 12 show how the connection of the connecting clip 1 with the sash frame plastic profile 5 is made. To do this, the elastic spring 10 is first inserted into the first hole 12, whereby the main extension direction of the flat plate 7 is approximately perpendicular to the outer surface 14; this is shown in Figure 9 Then - as in Figure 10 shown - the connecting clip 1 is moved in such a way that the flat plate 7 is rotated in a position parallel to the outer surface 14 and the second expansion spring 9 is pressed into the second hole 13. The web 11 is then located with play in the first hole 12. The second expansion spring 9 is centered by its conical head and then compressed so that it can be inserted into the second hole 13 and then expands again so that the second expansion spring 9 sits firmly in the second hole 13. The flat plate 7 then lies flat on the outer surface 14; this is shown in Figure 11 to see. Will now - as in Figure 12 shown - a screw 20 is screwed into the through-hole 19 of the second expansion spring 9, the expansion spring 9 can can no longer be compressed and the connecting clip 1 can no longer be pulled out of the second hole 13.

The play of the web 11 in the first hole 12 allows the connecting clip 1 to rotate slightly, with the second spreading spring 9 then serving as a pivot point. The rotating movement of the connecting clip 1 allows the first spreading spring 8 to move slightly up or down.

Now the facing shell 2 can be placed on the plastic profile 5 by putting the locking groove 18 over several first expansion springs 8, which are arranged in a row on the plastic profile 5. When the facing shell 2 is pressed down, the first expansion springs 8 are centered by their conical head and then compressed and pressed into the locking groove 18, where the expansion springs expand again and thus create a firm connection. This is in Figure 13 shown. In Figure 13 the elastic spring 10 is shown as if it were not elastically bending. It can be seen that the distance b is smaller than the material thickness of the plastic profile 5. In reality, the elastic spring 10 bends elastically and clamps the connecting clip 1 to the plastic profile 5, so that rattling is avoided.

If the two holes 12, 13 may not be drilled at exactly the same horizontal level during production and/or there is a height offset between individual connecting clips 1, the "floating" bearing of the connecting clips 1 can compensate for this offset without causing tension.

The invention is not limited to the embodiment.

The two holes 12, 13 can also have different diameters; in this case, however, the connecting clip 1 can no longer be installed in both directions. It must be ensured that the second spreading spring 9 has approximately the same diameter as the bore into which the second spreading spring 9 is inserted and that the cross-section of the web 11 can be inserted into the other bore with play.

In the embodiment, the distance a between the centers of the first and second spreading springs 8, 9 and the distance c between the center of the second spreading spring 9 and the center of the cylindrical web 11 are the same. The first spreading spring 8 and the web 11 are located on a common axis.

If, however, the distance a between the centers of the first and second spreading springs 8, 9 is greater than the distance c between the center of the second spreading spring 9 and the center of the cylindrical web 11, a larger height offset can be compensated. However, the flat plate 7 must then be longer than in the example. If, however, the distance a is smaller than the distance c, a smaller height offset can be compensated.

The figures each show the lower profiles of a frame. A frame usually consists of a lower, upper, left and right side. While the two holes at the top are also arranged horizontally next to each other, the two holes on the two sides are arranged vertically one above the other.

Plastic window profiles clad with metal profiles or shells always have a cladding on the outside. A cladding can also be arranged on the inside using connecting clips according to the invention.

What is essential to the invention is that the connecting clip 1 is rotatably mounted in a plastic profile 5, 6 via the second expansion spring 9 in the second bore 13, while the web 11 of the elastic spring 10 limits this rotational movement. The connecting clip 1 is also connected to the facing shells 2, 3 via the first spreading spring 8 and the locking grooves 18. The first spreading spring 8 is thus slightly displaced horizontally and vertically by the rotational movement of the connecting clip 1. The first spreading spring 8 rotates slightly in the locking groove 18 and is also slightly displaced in it. Since the web 11 of the elastic spring 10 only has a limited range of motion in the first hole 12, the rotational movement is limited, which is why the first spreading spring 8 is only slightly displaced horizontally and vertically. If the range of motion were larger, there would be a risk that the connection between the plastic profiles 5, 6 and the facing shells 2, 3 would become too mobile overall. The device according to the invention, on the other hand, compensates for usual tolerances, particularly in manually made holes 12, 13.

Legend

1

Connecting clip

2

Front shell

3

Front shell

4

poetry

5

Plastic profile

6

Plastic profile

7

flat plate

8th

first spreading spring

9

second spreading spring

10

elastic spring

11

web

12

First drilling

13

Second drilling

14

Plastic profile outer surface

15

Plastic profile outer surface

16

Front exterior surface

17

Front exterior surface

18

Locking grooves

19

Passage recess

20

screw
21

Claims (11)

Composite frame for a window or door, comprising - an outer facing frame made of metal profiles connected to one another in the corner area or at least one outer metal facing shell (2, 3), each of which has an outer facing surface (16, 17) which, in the installed position, is directed vertically towards the outside of the building A, - a base frame made of plastic profiles (5, 6) welded together in the mitre area, each having a plastic profile outer surface (14, 15) which, in the installed position, is directed vertically towards the outside of the building A, - wherein the outer front frame or the at least one outer metallic front shell (2, 3) are connected to the base frame via connecting clips (1),
characterized in that - the connecting clips (1) each have an at least approximately flat plate (7), - a first and a second spreading spring (8, 9) are arranged on both sides of the plate (7) at a distance a, - an elastic spring (10) is arranged on one side of the plate (7), the elastic spring (10) being connected to the plate (7) via a web (11), the web (11) being arranged at a distance c from the second spreading spring (9), and the elastic spring (10) leading away from the web (11) approaches the plane of the plate (7) up to a distance b, - holes (12, 13) are arranged in the outer surfaces (14, 15) of the plastic profiles (5, 6) at least approximately at a distance c, - the metal profiles or outer metal facings (2, 3) have locking grooves (18) on the side opposite the facing outer surfaces (16, 17), - wherein the connecting clips (1) are connected via the web (11) in connection with the elastic spring (10) and the second spreading spring (9) on the side of the elastic spring (10) by clipping through the holes (12, 13) in the plastic profiles (5, 6) and - the connecting clips (1) are connected to the metal profiles or outer metallic facings (2, 3) by means of the first spreading springs (8) on the side facing away from the elastic spring (10) via the locking grooves (18). Composite frame (2) according to claim 1, characterized in that the distance b is at least slightly smaller than the wall thickness of the plastic profile outer surface (14, 15). Composite frame (2) according to claim 1 or 2, characterized in that the first bore (12) and the elastic spring (10) as well as the web (11) are coordinated with one another in such a way that the elastic spring (10) with the web (11) can be guided through the first bore (12) with play, preferably 1 to 3 mm. Composite frame (2) according to one of claims 1 to 3, characterized in that the second bore (13) and second spreading spring (9) are coordinated with one another in such a way that the second spreading spring (9) can be guided through the second bore (13) in the compressed state and, after insertion, the second spreading spring (9) rests under elastic tension in the second bore (13). Composite frame (2) according to claim 4, characterized in that the second spreading spring (9) has a through-hole (19) and the second spreading spring (9) after insertion in the second bore (13) by means of a screw (20) in the through recess (19). Composite frame (2) according to one of claims 1 to 5, characterized in that the first spreading spring (8) and the locking grooves (18) are coordinated with one another in such a way that the first spreading spring (8) can be inserted into the locking grooves (18) in the compressed state and, after insertion, the first spreading spring (8) rests under elastic tension in the locking groove (18). Composite frame (2) according to one of claims 1 to 6, characterized in that the first and/or second spreading spring (8, 9) have at least approximately a rotationally symmetrical basic structure with slots parallel to the axis of rotation. Composite frame (2) according to one of claims 1 to 7, characterized in that the first bore (12) and the second bore (13) have the same diameter. Composite frame (2) according to one of claims 1 to 8, characterized in that the distance a is at least approximately equal to the distance c, wherein preferably the first spreading spring (8) and the web (11) are arranged on an axis opposite one another on the two sides of the plate (7). Composite frame (2) according to one of claims 1 to 9, characterized in that an inner front frame made of metal profiles connected to one another in the corner region or at least one inner metallic front shell is connected via connecting clips (1) to the plastic profile inner surface of the plastic profiles (5, 6) opposite the plastic profile outer surface (14, 15). Connecting clip (1) with an at least approximately flat plate (7), wherein on both sides of the plate (7) spaced apart by a distance a, a spreading spring (8, 9) is arranged, an elastic spring (10) is arranged on one side of the plate (7), the elastic spring (10) is connected to the plate (7) via a web (11) and the elastic spring (10) leads away from the web (11) and approaches the plane of the plate (7) up to a distance b, wherein the web (11) is arranged at a distance c from the second spreading spring (9).

Images