Window/door securing device

Abstract

A window/door securing device for securing a leaf, in particular an outwardly opening leaf, of a window or door in a closed position in which the leaf contacts a frame of the window or door comprises a base body and a counter-piece that is selectively latchable to the base body so that on a fastening of the base body to the frame and of the counter-piece to the leaf, the leaf can be secured in the closed position by latching the counter-piece to the base body. The base body has two installation surfaces so that one of the installation surfaces of the base body can be selectively placed on and fastened to the frame. In this respect, two installation surfaces are aligned perpendicular to one another.

Claims

1. A window/door securing device (11) for securing a leaf (27) of a window (31) or door in a closed position in which the leaf (27) contacts a frame (29) of the window (31) or door, wherein the window/door securing device (11) comprises a base body (39) and a counter-piece (47) that is selectively latchable to the base body (39) so that on a fastening of the base body (39) to the frame (29) and of the counter-piece (47) to the leaf (27), the leaf (27) can be secured in the closed position by latching the counter-piece (47) to the base body (39); wherein the base body (39) has two installation surfaces (19, 19), wherein only one of the installation surfaces (19, 19) of the base body (39) is selectively placed on and fastened to the frame (29) at a time, the other of the installation surfaces cooperating with the counter-piece; and wherein the two installation surfaces (19, 19) are aligned perpendicular to one another.

2. A window/door securing device in accordance with claim 1, wherein the two installation surfaces (19, 19) are adjacent to one another.

3. A window/door securing device in accordance with claim 1, wherein the two installation surfaces (19, 19) each have at least one screw leadthrough (51) through which a respective screw can be led for fastening the base body (39) to the frame (29).

4. A window/door securing device in accordance with claim 1, wherein the base body (39) is configured to be used as a drill template for the fastening of the counter-piece (47) to the leaf (27) in the state in which the base body (39) is fastened to the frame (29).

5. A window/door securing device in accordance with claim 4, wherein the two installation surfaces (19, 19) of the base body (39) each have at least one screw leadthrough (51) through which a respective screw can be led for fastening the base body (39) to the frame (29); wherein the counter-piece (47) has at least one screw leadthrough (51) through which a respective screw can be led for fastening the counter-piece (47) to the leaf (27); and wherein the arrangement of the at least one screw leadthrough (51) of the counter-piece (47) is the same as the arrangement of the at least one screw leadthrough (51) of each of the two installation surfaces (19, 19) of the base body (39).

6. A window/door securing device in accordance with claim 1, wherein the base body (39) has a receiver (49) for receiving a latch section (45) of the counter-piece (47).

7. A window/door securing device in accordance with claim 6, wherein the two installation surfaces (19, 19) of the base body (39) each have a receiver opening (53) through which the latch section (45) of the counter-piece (47) can penetrate into the receiver (49).

8. A window/door securing device in accordance with claim 7, wherein the two installation surfaces (19, 19) of the base body (39) each have at least two screw leadthroughs (51) through which a respective screw can be led for fastening the base body (39) to the frame (29); and wherein the receiver opening (53) of each installation surface (19, 19) is arranged between the at least two screw leadthroughs (51) of the respective installation surface (19, 19).

9. A window/door securing device in accordance with claim 7, wherein the receiver opening (53) of the other one of the two installation surfaces (19, 19) of the base body (39) is exposed when one of the two installation surfaces (19, 19) of the base body (39) is fastened to the frame (29).

10. A window/door securing device in accordance with claim 1, wherein the two installation surfaces (19, 19) of the base body (39) are configured symmetrically to one another.

11. A window/door securing device in accordance with claim 10, wherein the two installation surfaces (19, 19) of the base body (39) each have at least one screw leadthrough (51) through which a respective screw can be led for fastening the base body (39) to the frame (29); and wherein the two installation surfaces (19, 19) of the base body (39) are configured symmetrically to one another with respect to the position of the respective at least one screw leadthrough (51) of the two installation surfaces (19, 19).

12. A window/door securing device in accordance with claim 10, wherein the base body (39) has a receiver (49) for receiving a latch section (45) of the counter-piece (47); wherein the two installation surfaces (19, 19) of the base body (39) each have a receiver opening (53) through which the latch section (45) of the counter-piece (47) can penetrate into the receiver (49); and wherein the two installation surfaces (19, 19) of the base body (39) are configured symmetrically to one another with respect to the position of the respective receiver opening (53) of the two installation surfaces (19, 19).

13. A window/door securing device in accordance with claim 1, wherein the window/door securing device (11) comprises a latch (37) which is movably supported at the base body (39) between a release position and a latching position and via which the counter-piece (47) can be latched to the base body (39).

14. A window/door securing device in accordance with claim 13, wherein the base body (39) comprises a receiver (49); wherein the counter-piece (47) comprises a latch section (45); and wherein, for latching the counter-piece (47) to the base body (39) in the closed position of the leaf (27), the latch section (45) of the counter-piece (47) is received in the receiver (49) of the base body (39) and the latch (37) blocks the latch section (45) of the counter-piece (47) in the receiver (49) in the latching position.

15. A window/door securing device in accordance with claim 13, wherein the latch (37) is aligned and/or movable in parallel with the two installation surfaces (19, 19) of the base body (39).

16. A window/door securing device in accordance with claim 13 wherein the two installation surfaces (19, 19) of the base body (39) each have at least one screw leadthrough (51) through which a respective screw can be led for fastening the base body (39) to the frame (29); and wherein the latch (37) is arranged in the latching position such that it blocks the respective screw, which is led through the at least one screw leadthrough (51) of one of the installation surfaces (19, 19), against a release.

17. A window/door securing device in accordance with claim 13, wherein the window/door securing device (11) comprises a locking mechanism (23) that is arranged at the base body (39) and is configured to selectively block the latch (37) in the latching position against a movement into the release position.

18. A window/door securing device in accordance with claim 17, wherein the locking mechanism comprises a lock cylinder (23) whose cylinder axis (Z) is aligned at an angle of 45 to the two installation surfaces (19, 19) of the base body (39).

19. A window/door securing device in accordance with claim 18, wherein the lock cylinder (23) has disk tumblers.

20. A window/door securing device in accordance with claim 13, wherein the window/door securing device (11) has an actuation mechanism (35) via which the latch (37) is displaceable in the manner of the ink cartridge of a retractable ballpoint pen.

21. A window/door securing device in accordance with claim 1, wherein the counter-piece (47) has a latch section (45) that cooperates with the base body (39) for latching the counter-piece (47) to the base body (39) and that is configured as an eyelet (43).

22. A window/door securing device in accordance with claim 1, wherein the counter-piece (47) has a T shape having a shaft and a crossbar; wherein the shaft or a part of the shaft forms a latch section (45) which cooperates with the base body (39) for latching the counter-piece (47) to the base body (39); and wherein the crossbar of the T shape has a contact surface (55) for fastening the counter-piece (47) to the leaf (27).

23. A window/door securing device in accordance with claim 1, wherein the counter-piece (47) comprises two angular elements (57) having two respective limbs aligned perpendicular to one another; and wherein the angular elements (57) are each partly incised such that the angular elements (57) can be plugged into one another such that the two angular elements (57) together have a T shape, with one limb of the one angular element (57) and one limb of the other angular element (57) contacting one another and forming the shaft of the T shape and with the two other limbs forming the two limbs of the crossbar of the T shape.

24. A window/door securing device in accordance with claim 1, wherein the window/door securing device (11) comprises a fastening means (59) for fastening the counter-piece (47) to the leaf (27), the fastening means (59) having a base section (61), at least one prolongation (63) that extends away from the base section (61), and a security against rotation (65); wherein the fastening means (59) is configured to be arranged with the base section (61) at a side of the leaf (27) and to extend with the prolongation (63) so far into the leaf (27) or through the leaf (27) that the counter-piece (47) can be connected to the prolongation (63) at an opposite side of the leaf (27) and in so doing is secured against a rotation by the security against rotation (65).

25. A window/door securing device (11) for securing a leaf (27) of a window (31) or door in a closed position in which the leaf (27) contacts a frame (29) of the window (31) or door, wherein the window/door securing device (11) comprises a base body (39) and a counter-piece (47) that is selectively latchable to the base body (39) so that on a fastening of the base body (39) to the frame (29) and of the counter-piece (47) to the leaf (27), the leaf (27) can be secured in the closed position by latching the counter-piece (47) to the base body (39); wherein the base body (39) has two installation surfaces (19, 19) so that one of the installation surfaces (19, 19) of the base body (39) can be selectively placed on and fastened to the frame (29); wherein the two installation surfaces (19, 19) are aligned perpendicular to one another; wherein the base body (39) has a receiver (49) for receiving a latch section (45) of the counter-piece (47) and wherein the two installation surfaces (19, 19) of the base body (39) each have a receiver opening (53) through which the latch section (45) of the counter-piece (47) can penetrate into the receiver (49).

26. A window/door securing device in accordance with claim 25, wherein the two installation surfaces (19, 19) of the base body (39) each have at least two screw leadthroughs (51) through which a respective screw can be led for fastening the base body (39) to the frame (29); and wherein the receiver opening (53) of each installation surface (19, 19) is arranged between the at least two screw leadthroughs (51) of the respective installation surface (19, 19).

27. A window/door securing device in accordance with claim 25, wherein the receiver opening (53) of the other one of the two installation surfaces (19, 19) of the base body (39) is exposed when one of the two installation surfaces (19, 19) of the base body (39) is fastened to the frame (29).

28. A window/door securing device in accordance with claim 25, wherein the two installation surfaces (19, 19) of the base body (39) are configured symmetrically to one another with respect to the position of the respective receiver opening (53) of the two installation surfaces (19, 19).

29. A window/door securing device (11) for securing a leaf (27) of a window (31) or door in a closed position in which the leaf (27) contacts a frame (29) of the window (31) or door, wherein the window/door securing device (11) comprises a base body (39) and a counter-piece (47) that is selectively latchable to the base body (39) so that on a fastening of the base body (39) to the frame (29) and of the counter-piece (47) to the leaf (27), the leaf (27) can be secured in the closed position by latching the counter-piece (47) to the base body (39); wherein the base body (39) has two installation surfaces (19, 19) so that one of the installation surfaces (19, 19) of the base body (39) can be selectively placed on and fastened to the frame (29); wherein the two installation surfaces (19, 19) are aligned perpendicular to one another; wherein the window/door securing device (11) comprises a latch (37) which is movably supported at the base body (39) between a release position and a latching position and via which the counter-piece (47) can be latched to the base body (39) and wherein the latch (37) is aligned and/or movable in parallel with the two installation surfaces (19, 19) of the base body (39).

30. A window/door securing device (11) for securing a leaf (27) of a window (31) or door in a closed position in which the leaf (27) contacts a frame (29) of the window (31) or door, wherein the window/door securing device (11) comprises a base body (39) and a counter-piece (47) that is selectively latchable to the base body (39) so that on a fastening of the base body (39) to the frame (29) and of the counter-piece (47) to the leaf (27), the leaf (27) can be secured in the closed position by latching the counter-piece (47) to the base body (39); wherein the base body (39) has two installation surfaces (19, 19) so that one of the installation surfaces (19, 19) of the base body (39) can be selectively placed on and fastened to the frame (29); wherein the two installation surfaces (19, 19) are aligned perpendicular to one another; wherein the base body (39) is configured to be used as a drill template for the fastening of the counter-piece (47) to the leaf (27) in the state in which the base body (39) is fastened to the frame (29); wherein the two installation surfaces (19, 19) of the base body (39) each have at least one screw leadthrough (51) through which a respective screw can be led for fastening the base body (39) to the frame (29); wherein the counter-piece (47) has at least one screw leadthrough (51) through which a respective screw can be led for fastening the counter-piece (47) to the leaf (27); and wherein the arrangement of the at least one screw leadthrough (51) of the counter-piece (47) is the same as the arrangement of the at least one screw leadthrough (51) of each of the two installation surfaces (19, 19) of the base body (39).

31. A window/door securing device (11) for securing a leaf (27) of a window (31) or door in a closed position in which the leaf (27) contacts a frame (29) of the window (31) or door, wherein the window/door securing device (11) comprises a base body (39) and a counter-piece (47) that is selectively latchable to the base body (39) so that on a fastening of the base body (39) to the frame (29) and of the counter-piece (47) to the leaf (27), the leaf (27) can be secured in the closed position by latching the counter-piece (47) to the base body (39); wherein the base body (39) has two installation surfaces (19, 19) so that one of the installation surfaces (19, 19) of the base body (39) can be selectively placed on and fastened to the frame (29); wherein the two installation surfaces (19, 19) are aligned perpendicular to one another; wherein the window/door securing device (11) comprises a latch (37) which is movably supported at the base body (39) between a release position and a latching position and via which the counter-piece (47) can be latched to the base body (39); wherein the window/door securing device (11) comprises a locking mechanism (23) that is arranged at the base body (39) and is configured to selectively block the latch (37) in the latching position against a movement into the release position; wherein the locking mechanism comprises a lock cylinder (23) whose cylinder axis (Z) is aligned at an angle of 45 to the two installation surfaces (19, 19) of the base body (39).

32. A window/door securing device in accordance with claim 31, wherein the lock cylinder (23) has disk tumblers.

Description

FIGURES

(1) The invention will be described in more detail in the following only by way of example with reference to the Figures.

(2) FIGS. 1 and 2 show in perspective representations an embodiment of the window/door securing device in accordance with the invention in two different positions of a latch of the window/door securing device;

(3) FIG. 3 shows the embodiment shown in FIGS. 1 and 2 without a cover;

(4) FIG. 4 shows the embodiment shown in FIGS. 1 and 2 in a side view;

(5) FIG. 5 shows in a perspective representation an alternative embodiment of the window/door securing device in accordance with the invention without a lock cylinder;

(6) FIGS. 6 and 7 show in perspective representations the embodiment shown in FIGS. 1 and 2 from further viewing directions and with a separate counter-piece;

(7) FIG. 8 substantially corresponds to FIG. 7, with the window/door securing device being shown in section;

(8) FIG. 9 shows an arrangement of four window/door securing devices at a window;

(9) FIG. 10 shows an alternative embodiment of the counter-piece of a window/door securing device in accordance with the invention; and

(10) FIG. 11 shows a fastening means of an embodiment of a window/door securing device in accordance with the invention.

DETAILED DESCRIPTION

(11) The embodiments of a window/door securing device 11 in accordance with the invention shown in the Figures each have an elongate shape that extends along a longitudinal axis L and is outwardly bounded by a cover 17 at the two front sides 13 of its longitudinal extent and at the side surfaces 15, 15 visible in FIGS. 1 and 2. Whereas the transition between the two side surfaces 15, 15 covered by the cover 17 is rounded, the transitions to the two further side surfaces 19, 19, that cannot be seen in FIGS. 1 and 2, and the transition between these two side surfaces 19, 19 are formed as right-angled edges. These non-covered side surfaces form installation surfaces 19, 19 of the window/door securing device 11 and are aligned perpendicular to one another and to the respective adjacent further side surface 15 and 15 respectively (cf. also the shape of the front side 13 and FIG. 4).

(12) In the rounded transition between the side surfaces 15, 15, a cylindrical projection 21 extends in the cover 17 at an end of the longitudinal extent of the window/door securing device 11; it is aligned at an angle of 45 to the two installation surfaces 19, 19 and accommodates a lock cylinder 23 (cf. FIG. 3 in which the window/door securing device 11 is shown without the cover 17). The lock cylinder 23 is here aligned such that its cylinder axis Z is a bisectrix of the angle between the two installation surfaces 19, 19 (cf. also the sectional representation of FIG. 8 in whose sectional plane the longitudinal axis L and the cylinder axis Z are disposed). In this manner, a key 25 associated with the lock cylinder 23 is also easily accessible and actuable, when it is inserted into the lock cylinder 23, when the two installation surfaces 19, 19 of the window/door securing device 11 are arranged at a narrow angle between a leaf 27 and a frame 29 of a window 31 (cf. FIG. 9) or door.

(13) An actuation element 33 that is part of an actuation mechanism (cf. in particular FIG. 8) by means of which a latch 37 can be moved between a latching position and a release position is provided at the window/door securing device 11 at the end of the longitudinal extent opposite the end with the lock cylinder 23. The actuating mechanism 35 in the embodiment shown is configured in the manner of a retractable ballpoint pen mechanism so that the latch 37 can be displaced like the ink cartridge of a retractable ballpoint pen by pressing the pin-shaped actuation element 33 that extends through an opening in the front side 13 (cf. FIGS. 1 and 2).

(14) The embodiment of FIGS. 1 and 2 is shown in FIG. 3 without the cover 17 and without an inserted key 25. The base body 39 is an essential element of the window/door securing device 11; it is particularly stable and is produced from metal, e.g. as a casting, while the cover and the actuation mechanism are preferably at least substantially produced from plastic. The base body 39 is shaped such that the lock cylinder 23 can be inserted perpendicular to the longitudinal axis L and the latch 37 is movably supported along the longitudinal axis L in the base body 39. The actuation mechanism 35 is clipped to a web 41 of the base body 39. The cover 17 can be simply latchingly placed onto the base body 39. The window/door securing device 11 can thus be assembled comparatively simply, with the base body 39 representing the substantially bearing structure of the window/door securing device 11. The installation surfaces 19, 19 are additionally defined by the base body 39 as will be explained in more detail with respect to FIGS. 6 to 8.

(15) Two different positions of the actuation element 33 are shown in FIGS. 1 and 2. The position shown in FIG. 1 in which the actuation element 33 ends flush with the front side 13 corresponds to a latching position of the latch 37 in which it engages behind a latch section 45 of a counter-piece 47 that is formed as an eyelet 43 and that extends into a receiver 49 within the base body 39 of the window/door securing device 11 when the leaf 27 to be secured is closed (cf. also FIGS. 6 to 8). In this manner, the counter-piece 47 is latched to the base body 39 by the latch 37 in the latching position, whereby the leaf 27 is then secured in its closed position. The position of the actuation element 33 which is shown in FIG. 2 and in which it projects a lot out of the front side 13 in contrast corresponds to the release position of the latch 37 in which the latch 37 is led out of the eyelet 43 and the counter-piece 47 can therefore be released from the base body 39 so that the leaf 27 can be opened.

(16) A further latching position in which the actuation element 33 only projects slightly over the front side 13 can be provided between the two shown positions. The latch 37 also projects through the eyelet 43 in this further latching position so that the counter-piece 47 is latched to the base body 39 and the leaf 27 is thus secured in the closed position. The actuation mechanism 35 can then be active between the release position and this further latching position in the manner of a retractable ballpoint pen, with the latching position shown in FIG. 1 being achieved in that the actuation element 33 is pressed beyond the further latching position completely into the front side 13. In this position, the latch 37 is then held in cooperation with the lock cylinder 23 by which it is blocked against a departure from the latching position. For this purpose, for example, a ring groove of the latch 37 is engaged behind by a blocking element cooperating with the lock cylinder 23, as is shown in the sectional representation of FIG. 8. The latch 37 can therefore only moved out of the latching position corresponding to that of FIG. 1 into the release position when the lock cylinder 23 is actuated by the associated key 25. The window/door securing device 11 is thus additionally secured against unauthorized unlatching by this blockable latching position.

(17) FIG. 5 shows an alternative embodiment of the window/door securing device 11 that has no lock cylinder 23. The adjustment of the latch 37 here takes place only by actuation of the actuation element 33. A further latching position is not provided in this embodiment. The latch 37 can rather only be adjusted by the actuation mechanism 35 between two defined positions, namely a release position and a latching position (not additionally blockable) that corresponds to the position shown in FIG. 5. As long as such a window/door securing device 11 is not accessible for an intruder, a leaf 27 can also be reliably secured in its closed position by means of such a window/door securing device 11 that is not additionally blockable.

(18) The embodiment of the window/door securing device 11 shown in FIGS. 1 to 4 is shown from further angles of view in FIGS. 6 to 8 so that in particular the installation surfaces 19, 19 can be seen. The installation surfaces 19, 19 are primarily defined by corresponding surfaces of the base body 39. Since the cover 17 also covers the actuation mechanism 35 in an extension of the base body 39, the surface enlarged by this extension can also be considered as a respective installation surface 19, 19 so that the base body 39 and the cover 17 together define the installation surfaces 19, 19.

(19) The two installation surfaces 19, 19 are at least substantially flat to be able to contact the leaf 27 or the frame 29 of a window 31 or door. In addition, two respective screw leadthroughs 51 are formed in both installation surfaces 19, 19 at the base body 39 so that the base body 39 and the elements connected thereto can be screwed to the frame 29 via one of the installation surfaces 19, 19. The counter-piece 47 in contrast is fastened to the leaf 27.

(20) A respective receiver opening 53 through which the latch section 45 of the counter-piece 47 can move into the receiver 49 centrally formed in the base body 39 is provided between the two screw leadthroughs 51 of a respective installation surface 19, 19. The two receiver openings 53 of the two installation surfaces 19, 19 merge into one another so that they form a single receiver opening 53.

(21) As a result of the configuration of the installation surfaces 19, 19 symmetrically to one another, above all with respect to the position of their screw leadthroughs 51 and their receiver opening 53, a free selection can be made as to with which installation surface 19, 19 the base body 39 should cooperate with the leaf 27 and with which it should cooperate with the frame 29. For both installation surfaces 19, 19 are equally suitable for fastening the base body 39 via screws led through the screw leadthroughs 51 and for receiving the latch section 45 of the counter-piece 47 through the receiver opening 53 into the receiver 49. The counter-piece 47 is therefore not only shown in a position in FIG. 6, as in FIG. 7, from where it can cooperate via the lower installation surface 19 with the base body 39, but additionally (chain-dotted) also at a further position from where it can equally reliably cooperate with the base body 39 via the front installation surface 19. A particularly flexible arrangement of the window/door securing device 11 is thus possible at different positions and in different alignments, also only with a small amount of available space. This is illustrated by FIG. 9 in which four window/door securing devices 11 are arranged at an outwardly opening double-leaf window 31 to be able to secure the two leaves 27 contacting the frame 29 in their respective closed positions against opening.

(22) FIGS. 6 and 7 show a possible embodiment of the counter-piece 47 in which the counter-piece 47 has a T shape at whose shaft the latch section 45 is configured with the eyelet 43 and whose crossbar forms a contact surface 55 having two screw leadthroughs 51. In this manner, the contact surface 55 of the counter-piece 47 can be reliably screwed to the leaf 27, can have a projecting latch section 45 that is fastened in a stable manner, and can simultaneously be of very compact design. In the embodiment shown in FIGS. 6 and 7, the counter-piece 47 is formed as a single-part lost wax casting. An alternative embodiment to this is shown in FIG. 10.

(23) The basic structure of the embodiment of the counter-piece 47 shown in FIG. 10 in this respect corresponds to that of the embodiment shown in FIGS. 6 and 7. The counter-piece 47 in turn has a T shape having a latch section 45 and a contact surface 55. The counter-piece 47 is, however, formed in two pieces and comprises two right-angle angular elements 57 of the same construction. The angular elements 57 are each incised down to the center at the edge at which the limbs of a respective angular element 57 are adjacent to one another so that the angular elements 57 can, as shown, be plugged into one another and the counter-piece 47 thus formed then has a T shape. The shaft of the T shape is in this respect formed by two mutually contacting limbs that are part of a respective different angular element 57. Since the limbs of both angular elements 57 each have a screw leadthrough 51, the mutually contacting limbs can together form the latch section 45 (advantageously reinforced by a double thickness) with an eyelet 43, while the two remaining limbs are aligned in a plane and together form the contact surface 55 having two screw leadthroughs 51 for fastening the counter-piece 47 to the leaf 27.

(24) The counter-piece 47 can generally be simply screwed into the leaf frame of the leaf 27. A more stable fastening results, however, when an additional fastening means 59 is provided that extends through the leaf frame. A possible embodiment of such a fastening means 59 is shown in FIG. 11. The fastening means has a base section 61 from where a pin-like prolongation 63 extends that is configured as a threaded sleeve having an internal thread. The prolongation 63 of the fastening means 59 can then be led through the leaf frame of the leaf 27 to fasten the counter-piece 47 by means of a screw that is screwed into the prolongation 63. Depending on the length of the screw, the prolongation does not have to extend completely through the leaf frame here. If the counter-piece 47 is to be fastened by means of a plurality of screws, the fastening means 59 can also have further corresponding prolongations 63, in particular equally configured as threaded sleeves. Since then a plurality of prolongations 63 extend through the leaf frame, the fastening means 59 is thereby secured against rotation so that the screw connection cannot be unscrewed from that leaf side which the base section 61 contacts.

(25) However, even if the counter-piece 47 is only connected to the fastening means 59 via one screw connection, it can be secured against rotation. For this purpose, as in the embodiment shown in FIG. 11, a security against rotation 65 can be configured in the form of a further pin-shaped prolongation at the base section 61. This further prolongation 65 then does not have to have any thread and can be substantially shorter than the prolongation 63 cooperating with the counter-piece 47. For it is sufficient that the further projection 65 engages into the leaf frame to act as a security against rotation 65 for the fastening means 59.