DE29513098U1 - Window / door with turn-tilt fitting - Google Patents

Abstract

A window or door with pivot or tilt mechanism has locking elements, at least one of which has an entry slot (25) which is rigidly connected to the control rod (8) of the fitting (6) and operates in the tilted and locked positions. A mushroom bolt (9) aligned to this locking element, is also rigidly located at this point. This locking element is attached to the cover slide (7) of the fitting at least over the length of the entry slot, and is also fixed to the control rod. The control rod and the cover slide are located on a securing plate (13) behind the fitting groove (5) and against the door or window frame.

Description

Window/door with tilt and turn fitting

The present invention relates to a window/door according to the preamble of claim 1.

Such a window is known, for example, from 20 G 93 08 472 or EP 94 107 819.

The object of the present invention is to further develop the known window in such a way that even more secure protection against the sash being lifted out is achieved by providing additional locking pairs. This object is achieved in the window/door mentioned at the beginning by the features of claim 1.

Advantageous further training results from the under-30 requirements.

The invention is explained in more detail below using exemplary embodiments. They show:

35 Fig.l a first embodiment of the invention,
Fig.2 a cross-section of the representation according to Fig.l

along line II-II,
Fig.3 a detailed view of the representation according to Fig.l

with cover rail, drive rod and rear grip-40
plate,

»ft · ft · · ·■-.=._. · «ft

ft··· ft ··· ft ft···

Fig. 4 to 7 further variation mechanisms with the ^# Srr-

finding,

Fig.8 Details of the rear gripping plate,
Fig.9 Cross-sectional view of a window/door,
Fig.10 an embodiment with locking plate

firmly connected to the drive rod,
Fig.11 an embodiment with locking plate

firmly connected to the deck rail,

Fig.12 Locking plate with teeth along its
Longitudinal edges, and

Fig.13 View of a window/door.

Unless otherwise stated below, the following description always applies to all figures.

Fig.13 shows a window/door with a so-called tilt-and-turn sash. The sash frame 1 is mounted on the frame 11 so that it can be tilted about a lower horizontal axis 30 or rotated about a vertical axis of rotation 31. To determine the respective axis of rotation, so-called locking pairs 32 are provided between the frame 11 and the sash frame 1. Each of these locking pairs 32 consists of individual locking partners, one of which is mounted on the frame 11 and the other locking partner on the sash frame 1. Depending on the locking partners that are engaged at any one time, either the horizontal tilt axis or the vertical axis of rotation of the window/door is defined. Which of the locking pairs is engaged at any one time is specified by turning the handle 33 on the sash frame in conjunction with a known tilt-and-turn fitting.

In this way, in the tilt position, the locking pairs 32 located below are engaged, in the rotating position none of the locking pairs are engaged, in the closed position all locking pairs are engaged.

The engaged locking pairs 32 are

formed from a mushroom bolt 9, which interacts with an associated insertion slot 25 on the other frame part. This is done by the mushroom bolt 9 and insertion

slot 25 are movable relative to one another in the longitudinal direction of the sliding slot. The mushroom bolt 9 can therefore be moved into the slot 25 from the open side. The mushroom-head-like thickened end of the mushroom bolt 9 engages behind the slot 25 in such a way that the sash frame 1 is reliably held in place by the tensile connection between the mushroom bolt 9 and the slot 25 when attempting to lift it.

It is therefore essential that a continuous tension connection is created between the sash frame 1 and the frame 11, which prevents the sash frame 1 from being levered out of its predetermined position on the frame 11, particularly in the tilt position.

This is known in itself (see EP 94 107 819).

However, the special interaction of the locking partners is special, which will be discussed below using Figures 1 to 3. In particular, Figure 1 shows a section of a window/door. The entire frame is made of hollow plastic profiles. At least the frame 11 also has a metal reinforcement 34 which is inserted through a cavity in the frame 11. A so-called locking piece 10 is attached to the rebate side 35 of the frame 11 and is firmly connected to the frame 11. The locking piece 10 is advantageously screwed to the frame 11 with continuous screws, with the screws in particular also penetrating the metal reinforcement 34 and in this way firmly anchoring the locking piece 10 to the frame 11. In contrast, the sash frame 1 here has the fitting groove 5. The window fitting 6 is inserted in the fitting groove 5. Such a window fitting 6 consists of a cover rail 7 and a drive rod 8 that slides along the cover rail 7. The drive rod 8 is set in motion via the handle 33, as is known per se, and is thereby moved along the cover rail 7. The drive rod 8 in turn drives a locking partner 12, which is assigned to the locking piece 10. The locking partner 12 is therefore rigidly connected to the drive

Rod 8 is connected to the drive rod 8. For this purpose, the cover plate 7 has elongated holes 37 in the connection area between the locking partner 12 and the drive rod 8. These elongated holes 37 are penetrated by drive rod bolts 36. In this way, a rigid connection is created between the drive rod 8 and the locking partner 12 on the drive rod, by means of which the locking partner is moved synchronously and in the same direction as the drive rod 8 when the handle 33 is operated. The locking plate 13, which is supported in a suitable manner behind the fitting groove 5 against the casement 1, is used for additional fastening of the fitting 6 to the casement 1. This will be discussed later. At least the locking plate 13 is arranged so that it engages behind the fitting groove 5. It is also important, however, that depending on the actual installation conditions between the casement 1 and the frame 11, a locking plate 13 is not absolutely necessary. However, the use of the locking plate 13 provides additional security against the sash frame 1 being forced open. This will be discussed later.

What is important now is the special design of the locking pairs alone or preferably in combination with the fastening of the fitting to the sash frame using the locking plate 13.

For this purpose, it is provided that of the locking partners 10, 12 in the closed position and the tilted position, at least one of the locking partners 12 with the insertion slot 25 is rigidly connected to the drive rod 8 of the fitting 6. This locking partner has an associated mushroom bolt 9 on the frame 11. The insertion slot 25 and the mushroom bolt 9 are movable relative to one another in order to allow the mushroom bolt with its hat to engage behind the undercut area of the insertion slot 25 either in the closed position or in the tilted position.

This rear grip alone makes it considerably more difficult to pry open the sash frame, even in the tilted position.

because this would require the fitting to be torn out of the fitting groove provided for this purpose 5 in the sash frame.

This is an essential aspect of the invention. The locking partner with the entry slot must extend over a relatively large length on the fitting, at least the length of the entry slot 25. The locking partner with the entry slot 25 is connected to the drive rod 8 of the fitting 6, preferably laid flat against the cover rail. The large extension length of this locking partner 12 along the cover rail 7 additionally reinforces the fitting β in this area, since the locking partner 12 in question sits on the drive rod 8 and also acts as a longitudinal reinforcement of the drive rod 8. As a result of the thickening of the drive rod 8 at this point with the cover rail 7 interposed over the length of at least the entry slot 25, the fitting 6 is additionally reinforced to be rigid.

In a further development of the invention, the engaging securing plate 13 should also be arranged in the area of this longitudinal reinforcement of the drive rod 8. This results in a large-scale distribution of the supporting forces from the securing plate 13 to the engaged zones of the sash frame 1, so that immense force is necessary to destroy this engaging zone.

In order to make this possibility more difficult, it can therefore be additionally provided that the fitting, consisting of drive rod 8 and cover rail 7, is held at least in the longitudinal area of the locking partner 12 attached to it with insertion slot 25 by means of a locking plate 13 that engages behind the fitting groove 5. This locking plate 13 engages behind the plastic profile of the sash frame 1 and is connected in the direction of the frame 11 either with the drive rod 8 or with the cover rail 7 of the fitting 6. In this way, the locking plate 13 can be supported on the sash frame 1 in the engaging area, provided that the engaging pairing of mushroom bolt-entry slot (9-25) is loaded in the pulling direction when the sash frame 1 is levered open. The sash frame 1 thus attached forms a

structurally only with extreme force ©u't-renfiahao'EiatfeuP ¹ with the frame 11. An essential aspect for the best protection against prying is therefore the combination of one or more locking partners 12 with entry slot 25 on the sash frame 1 and the arrangement of the engaging locking plate 13 behind it in such a way that the drive rod 8 and cover rail 7 of the fitting are not only protected against being pulled out of the fitting groove by means of the locking plate 13, but are also largely secured against bending due to the flatly attached locking partner 12 with entry slot 25.

In principle, the locking plate 13 can cover any area

of the sash frame 1. However, it is advantageous to engage behind a projection of the fitting groove 5. This offers the advantage that known plastic profiles can continue to be used without the need for modification.

Fig. 1 and 4 agree in that the entry slot 25 and mushroom bolt 9 are raised on the drive rod 8. They form a so-called first locking part. For this purpose, the entry slot 25 and mushroom bolt 9 are arranged on a common connecting plate 26. The connecting plate 26 lies with its flat back surface 27 close to the counter surface of the adjacent cover rail 7 and is moved together with the drive rod 8 via the drive rod bolts 36 shown in Fig. 3 and already described. The entry slot 25 and mushroom bolt 9 on the drive rod 8 are assigned to another mushroom bolt 9 and an associated entry slot 25 on the frame 11. The latter two locking elements are seated on another connecting plate 26 and form the so-called second locking part. Consequently, one of the locking parts is firmly connected to the fitting &bgr; and the other of the locking parts is firmly connected to the frame 11. In any case, the insertion slot 25 and mushroom bolt 9 of one locking part (4 of the first locking part on the drive rod) must also be arranged between the insertion slot and the mushroom bolt of the other locking part (4 of the second locking part on the frame) and be movable between two end positions. In each of the two end positions, the first locking part on the drive rod engages the second

locking part on the frame. An intermediate middle position, shown in Fig.1,4, is for the first and second locking part without engagement. In this middle position, the sash frame 1 can therefore be opened relative to the frame 11, 5

5 and 6 show further embodiments. In both cases, the locking part 12, which is connected to the drive rod 8, has a side open slot 28 into which the mushroom bolt 9, which is rigidly connected to the frame 11, can move laterally. After the mushroom bolt 9 has moved a certain amount into the side slot 28, it reaches a longitudinal plane in the associated locking piece 12. On both sides of the side slot 28, the insertion slot 25 extends in this longitudinal plane in both longitudinal directions of the fitting 6, as described above. If the locking piece 12, which is connected to the drive rod 8, is in the middle position shown, the sash frame 1 can be opened or closed relative to the frame 11. If the sash frame 1 is closed, the drive rod 8 is then set in motion via the handle 33. The locking piece 12 is driven accordingly and the associated mushroom bolt 9 on the frame 11 can move into the associated insertion slot 25.
25

The difference between Fig.5 and 6 is that in the case of Fig.5 only one mushroom bolt is provided. This mushroom bolt therefore works with a different insertion slot 25, depending on the rotation position or the tilt position of the sash frame 1. In contrast to this, Fig.6 shows that two mushroom bolts are provided, which in turn are arranged on a common connecting plate 26. In this case only one mushroom bolt works either for the closed position of the window sash or for the tilt position. The side slot 28 must, however, be correspondingly wider. This also results in the advantage that the locking piece 12 on the sash frame is attached to the fitting 6 with a correspondingly larger contact surface. The fitting 6 is therefore additionally reinforced against deflection.

Furthermore, Fig.7 shows that a locking part 12 can be attached to the drive rod 8, which has two insertion slots 25 that are open at the outside end. In this case, a pair of mushroom bolts 9 is rigidly connected to the frame 11. One of the mushroom bolts interacts with one of the insertion slots in the closed position and the other mushroom bolt interacts with one of the insertion slots in the tilted position. In order to achieve increased stability here too, it is proposed to arrange both mushroom bolts 9 on a common connecting plate 26.

As already mentioned, the relatively large contact surface between the locking piece 12 and the fitting 6 counteracts any violent bending of the fitting. Additional security can therefore be provided by the locking plate 13. This issue will be discussed in more detail below.

The following figures 8 to 12 show a casement frame, as is known for windows or doors, for example. Such casement frames 1 consist of frame members 2, 3 which are assembled at right angles in the area of miter points 4. Such frame members are usually made of plastic profiles, but this does not restrict the invention to plastic profiles. Casement frames of this kind, as is known per se, are also made of wood. Furthermore, wooden frames of this kind have become known in which the fitting groove 5 (see Fig. 9) consists of a plastic insert which is firmly screwed to the material of the casement frame.

As can be seen from Fig. 1 to 3 or Fig. 8, 9, the fitting groove 5 forms a longitudinal material recess on the casement 1. The fitting groove 5 has two opposing projections 14, which define the narrowest cross-section of the fitting groove 5. In the direction towards the glass side of the casement, the fitting groove 5 widens behind the projections 14 and thus forms an undercut area.

As is known per se, the fitting groove 5 serves to accommodate a window fitting 6. This type of window fitting 6 consists of a cover rail 7 and a drive rod 8 that runs lengthways along it. The cover rail 7 is usually screwed to the base of the fitting groove 5 using screws through corresponding elongated holes in the drive rod 8 and held in place against the sash frame. As can also be seen, the so-called mushroom bolt 9 is firmly connected to the drive rod 8. Mushroom bolts can also be provided in pairs.

(see EP 628 691), namely a mushroom bolt for the closed position and a mushroom bolt for the tilted position of the casement. The associated locking piece 10 has corresponding longitudinal recesses into which the mushroom bolts move with their stem area, so that the extended areas of the mushroom bolts engage behind these entry slots and the casement is thus prevented from being levered out. As already mentioned, the cover rail 7 can be fixed in the fitting groove 5 using suitable screws. In particular, as a break-in protection, it is provided here that the cover rail 7 and drive rod 8 are held on the casement by means of a locking plate 13 engaging behind the projection 14 of the fitting groove 5 and that the fitting groove 5 has an entry opening 20 for the locking plate 13 located outside the holding area 23. In addition, the special case is shown that the locking plate 13 is only provided in the longitudinal area 12 of the locking partner on the drive rod 8.

This results in the advantage that the engaging area of the mushroom bolt 9 on the locking piece 10, and thus the fixing of the mushroom bolt to the frame 11, receives an immediately adjacent and thus correspondingly stable abutment on the sash frame 1. While on the one hand the locking piece 10 is firmly connected to the frame 11, so that the extended area of the mushroom bolt 9 is held in connection with the frame 11 in a break-proof manner, the corresponding counter-support of the window fitting 6 is provided by the security plate 13, which engages behind the projections 14 of the fitting groove 5 in a break-proof manner.

For this purpose, the expanded area 15 of the fitting groove 5 accommodates the securing plate 13, the width 16 of which is greater than the width 15 of the fitting groove 5 reduced by the projections 14.
5

In the event of a break-in attempt, the security plate 13 presses firmly against the projections 14 and thus prevents the window fitting 6 from being pulled out in the break-in-sensitive window corner area.

As can be seen from Fig.10 and 11, the locking plate 13 can be firmly connected to the drive rod 8. It then follows the longitudinal movement of the drive rod 8 within the extended area 15 of the fitting groove 5 and is mounted for this purpose with play in the longitudinal direction within the fitting groove 5. In contrast to this, Fig.11 shows that the locking plate 13 is firmly connected to the cover rail 7 by means of a bolt 17. The bolt 17 breaks through the drive rod 8 in the area of an elongated hole 19 so that the drive rod 8 can move unhindered by the fastening of the locking plate 13. This variant offers the advantage that additional force must be used to break out the window fitting 6 in order to destroy the cover rail 7 together with the drive rod 8. The main advantage of this design is that in the event of a break-in attempt, cover rail 7 and drive rod 8 are pressed against each other and form a practically indestructible unit. This unit can practically only be broken open by making it impossible to destroy the bolts 17,17a for the locking plate or mushroom bolt.

As can also be seen from the figures, the bolt 17 with its bolt head 18 is mounted in the locking plate 13 in a recess 24, so that the upper side of the locking plate 13 is guided with play in the vertical direction to the fitting groove, which enables guidance and smooth movement.

In addition, Fig.8 shows that the inlet opening 20 for

the securing plate 13 is created at the end of the frame beam 2 through a material recess. In the present case

the inlet opening 20 is arranged in the area of the frame frame 4, but this does not restrict the invention. For this purpose, all that is required is a milling of the miter area 4 where the fitting grooves of the frame beams 2, 3 meet. This inevitably results in the inlet opening 20 for the window fitting 6 according to the invention at the end of the frame beam 2.

In addition, Fig. 12 shows a security plate 13 which is equipped on two of its opposite longitudinal edges 21 with a toothing 22 pointing in the direction of the projection 14. By means of this toothing, the security plate 13 claws behind the projection 14 during a break-in attempt and thus achieves an additional counterforce that counteracts the break-in direction.

In order to achieve the effect of the flat support between the locking partner with the entry slot on the drive rod 8 and the drive rod, and in this way to make it more difficult for the drive rod to bend when the sash frame is levered out, several variations can be used.

Fig. 1 to 7 show that the entry slot 25 and mushroom bolt 9 are each provided on a single locking part. This locking part 12 is rigidly connected to the drive rod 8. It is a component arranged along the drive rod 8. This component has both an entry slot 25 and an opposite mushroom bolt 9. The component can be made of chrome-nickel steel or a similarly tough material, for example.

The associated locking part 10 on the frame 11 has a mushroom bolt 9 on the side facing the insertion slot 25 of the locking part 12 on the drive rod 8, while the opposite end of the locking part 10 on the frame 11 is provided with an insertion slot 25 provided for the mushroom bolt 9 on the fitting 6. Within the clear width between the mushroom bolt 9 and the insertion slot 25 of the locking part 10 on the frame 11

the associated locking part 12 can be moved on the drive rod 8 in such a way that either the right locking pair, the left locking pair or no locking pair is engaged. These three positions correspond to the closed position of the window, the open position of the window and the tilt position of the window. Deviating from this, Fig. 5 shows that it can also be provided to attach only one mushroom bolt to the frame 11. A base plate 26 can be used for this purpose if necessary in order to obtain a sufficiently large contact surface on the frame 11. In this case, it is also proposed that the locking part 12 of the drive rod 8 has a central insertion slot 25, from which an insertion slot 25 extends in a longitudinal direction to the drive rod 8 and engages with the mushroom bolt 9. Here too, three positions are provided:

Either the mushroom bolt 9 is engaged with the right-hand slot 25 25, in the middle position it can be moved out of the locking part 12 without hindrance, or in the left end position with the other slot 25. In this way, the closed position, the open position and the tilt position of the window sash are realized and yet in the closed position and tilt position there is a tension-resistant and pry-proof connection between the sash frame and the frame 11.

Fig.6 shows, as a further embodiment, the arrangement of two mushroom bolts 9 on the frame 11. The mushroom bolts 9 span a certain distance between them. Within this distance, a locking piece on the fitting or on the drive rod 8 of the fitting can be moved in such a way that this fitting with its outwardly open ends is either retracted into one of the mushroom bolts or can be moved out in the central position relative to the mushroom bolts. The function of this locking point pair corresponds to the function described above, if required also in combination with a locking plate 13 on the sash frame that engages behind the fitting groove. In this embodiment, too, it can be provided to arrange the mushroom bolt pair 9 on a common fastening plate 2 6, which is to be fastened to the frame 11 with a large contact surface.

The fastening of the locking parts to the frame 11 can in any case be carried out by screwing them to the internal metal reinforcement part that is usual for windows of this type. If necessary, screws with increased thread pitches can also be provided in order to further increase the pull-out security. With such screws, the core diameter is significantly smaller in relation to the nominal diameter in order to allow these screws to engage the metal reinforcement profile with an appropriate rear grip zone.

For the invention, it is essential that at least one of the locking partners is arranged with an insertion slot on the drive rod 8 of the fitting. Since such insertion slots require a predetermined length of the associated locking part, namely at least the insertion length, the drive rod 8 of the fitting is disproportionately reinforced against bending in this area, whereby an extraordinarily high level of protection against prying open of the sash frame is achieved with the use of the corresponding locking plate 13 engaging behind it.

• »»« · i ·* · ♦ Ht

2-4 ;&udiagr;*7. 1995

List of reference symbols:

1 casement / window

2 Frame beam 3 Frame beam

4 Mitre point

5 Fitting groove

6 Window fittings

7 Cover rail 8 Drive rod

9 mushroom bolts

10 Locking piece

11 Frame

12 Longitudinal area of the locking partner on the drive rod 13 Safety plate

14 Advance

15 extended area

16 Width of the locking plate

17 Bolt for locking plate 17a Bolt for mushroom button

18 Bolt head

19 Long hole in the drive rod

20 Entrance opening

21 Longitudinal edge 22 Toothing

23 Holding area

24 Sinking

25 Entry slot

26 Connecting plate 27 Back surface

28 side slot

30 horizontal tilt axis

31 vertical axis of rotation

32 Lock pair 33 Handle

34 Metal reinforcement

35 Rebate air side

3 6 Drive rod bolts

37 Long hole

Claims (16)

*!**♦♦* *·♦**·«· ·24·.*Φ7,1995 claims; 1. Window/door with tilt-and-turn fitting, consisting of a drive rod (8) and cover rail (7), with locking partners which engage with one another in both the closed position and the tilt position being provided on the lower cross member between the frame and the sash frame, which locking partners consist of entry slots which are open at the end and mushroom bolts which are movable relative thereto in the longitudinal direction of the entry slots by means of the fitting, with one locking partner being attached to the frame and the other locking partner to the sash frame, characterized in that of the locking partners in the closed position and the tilt position, at least one of the locking partners with entry slot (25) is rigidly connected to the drive rod (8) of the fitting (6) and the associated mushroom bolt (9) is arranged stationary relative thereto. 2. Window/door according to claim 1, characterized in that the locking partner connected to the drive rod (8) of the fitting is attached to the cover rail (7) of the fitting at least over the length of the insertion slot and is fastened to the drive rod (8). 3. Window/door according to claim 1 or 2, characterized in that the drive rod (8) and cover rail (7) are held at least in the longitudinal region (12) of the locking partner on the drive rod with a locking plate (13) supported against the sash frame behind the fitting groove (5), preferably that the locking plate (13) engages behind the fitting groove (5). 4. Window/door according to claim 3, characterized in that the securing plate (13) engages behind a projection of the fitting groove (5). 5. Window/door according to one of claims 3 or 4, characterized in that the sash frame has an outside holding area has an entry *t*ts*8f fnu*ng**for *fii1?* securing plate (13). 6. Window/door according to one of claims 3 to 5, characterized in that the securing plate (13) is firmly connected to the drive rod (8) and is mounted with play for movement in the longitudinal direction within the fitting groove (5). 7. Window/door according to one of claims 3 to 5, characterized in that the securing plate (13) is firmly connected to the cover rail (7) by means of bolts (17) and that
the bolt (17) breaks through the drive rod (8) in the area of an elongated hole (19). 8. Window/door according to one of claims 3 to 5, characterized in that the securing plate (13) is arranged together with the mushroom bolt (9) and locking piece (10) in the end region of the associated frame member (2). 9. Window/door according to claim 8, characterized in that the window fitting (6) ends at the end of the frame beam (2) and that the free end of the window fitting (6) is held there with the locking plate (13). 10. Window/door according to one of claims 5 to 9, characterized in that the inlet opening (20) is made by a material recess lying transversely to the longitudinal direction of the sash frame. 11. Window/door according to claim 10, characterized in that the inlet opening (20) is located at the end of the frame member (2) and preferably in the region of the mitre point (4). 12. Window/door according to claim 3, characterized in that the locking plate (13) is non-rotatably rigidly connected to the drive rod (8) or cover rail (7) and has a width (16) which corresponds to the clear width of the extended area (15) of the fitting groove (5). 13. Window/door according to claim 3, characterized in that the securing plate (13) is equipped with a toothing engaging in the projection (14) on its lateral longitudinal edges (21) facing the projection (14) of the fitting groove (5). 14. Window/door according to claim 1, characterized in that Entry slot (25) and mushroom bolt (9) sit on a connecting plate and slide raised on the cover rail (= 1st locking part) and that associated mushroom bolt and insertion slot are located on another connecting plate (= 2nd locking part) on the frame, and that the insertion slot and mushroom bolt of one locking part are arranged and movable between the insertion slot (25) and '15 mushroom bolt (9) of the other locking part. (Fig.1,4) 15. Window/door according to claim 1, characterized in that the locking part(s) (12) connected to the drive rod (8) has two insertion slots (25) open at the ends, and that a pair of mushroom bolts is rigidly connected to the frame, of which one mushroom bolt (9) in the closed position and the other mushroom bolt (9) in the tilted position cooperates with one of the insertion slots (25), and that preferably both mushroom bolts sit on a common connecting plate (26). (Fig.7) 16. Window/door according to claim 1, characterized in that the locking part on the drive rod (8) of the fitting has a laterally open slot (28) and a longitudinal slot (25) accessible via the side slot (28) which extends - starting from the side slot (28) - in both longitudinal directions of the fitting (6) and that one or more closely spaced mushroom bolts (9) interact with this longitudinal slot (25), whereby the mushroom bolt(s) (9) which is/are fixedly attached to the frame (11) is preferably arranged on a fastening plate (26). (Fig.5,6)