EP0711896B1 - Locking device for windows, doors, or the like - Google Patents

Abstract

The movable control (10) is fixed to a connecting rod (15) movable longitudinally (14) by a handle, between at least one closed and one release position. The counter piece has at least one lever (30,30') movable laterally to the control's path. The lever has a hook opening (33,33') defined by an outer hook arm (31,31') on its side facing away from the lever's pivot bearing (46). The counter piece has a fixed housing (21) with a slide guide (25) for the pivot bearing. When closed the hooked lever swivels towards the control until its hook opening contains the control and its outer hook arm protrudes in front of the control. When opened, the hooked lever swivels away from the control until its outer hook arm leaves the control's path.

Description

The invention relates to a device in the preamble of Claim 1 specified type. In the known device (DE-AS 11 99 159) the drive rods are in the rebate area of the wing and are moved longitudinally by a handle provided on the wing. The movable control members seated on the drive rod consist of simplest case from tenons, while the resting counterparts from striking plates exist, which are attached in the fold area of the frame. By the pin can move the handle with respect to the striking plates into a closed position are transferred where they engage behind the frame-side striking plates and thereby the wing in its closed position on the frame fix. However, the pins can also be moved from the handle to a release position be transferred where they no longer the frame-side striking plates reach behind and therefore allow opening of the wing. By suitable It is also the profiling and arrangement of the control links and counter links possible to reach positions in which the wing relative to the frame tilted about a horizontal lower axis or about one in the Vertical or horizontal axis located in the middle of the wing can. The arrangement of the movable control links and stationary counter links can also be carried out in a mirror image manner by the longitudinally movable pins on the frame and the fixed striking plates are on the wing.

In the known locking devices, the closed position of the control member not secured on the opposite link. The pin takes up in the closed position no fixed position on the curve profile of the striking plate. Due to inaccurate Assembly of the closure parts and / or by manufacturing or assembly tolerances there are deviations in position that lead to rattling noises in the closed position or when operating the handle to malfunctions to lead.

In a device of another type (FR 2 488 318 A) is on a door leaf a two-armed, spring-loaded pawl, which except a hook arm still has a release arm. The pawl is under a spring force, the release arm being supported on a rotary stop. The hook arm does not act as a movable control element, but instead locking pin fixedly attached to the window frame, which at Closing the door in a channel of a guide plate next to the hook arm retracts and snaps behind the hook head of the hook arm. To the Unlocking the device is a separate, movable unlocking pin provided, but not with the hook arm, but with the additional release arm cooperates. This device requires two Pin, two arms on the handle and a guide plate. It is expensive.

The invention has for its object a reliable closure device to develop the type mentioned in the preamble of claim 1, which automatically a defined position of the movable control member at rest Ensures counter member in the closed position. This is according to the invention achieved by the measures listed in the characterizing part of claim 1, which have the following special meaning.

In the invention, the counter member is movable in itself and comprises at least a pivoting lever that has a hook opening for receiving of the longitudinally displaceable control member and therefore briefly below "Hook lever" should be referred to. The hook lever can be swiveled and that transverse to the direction of displacement of the control member. In the closed position the device, the hook lever is pivoted as far as the control element, that the control member is caught in the hook opening. The hook opening is on its side facing away from the swivel bearing of the hook lever bounded by an outer hook leg that is in the closed position reaches in front of the control element and its backward displacement is opposed. To release the control element, the hook lever only needs so far to be swung away until its outer hook leg out of the displacement path the control element has come out. Both swivel movements of the hook lever are caused by the longitudinal displacement of the on the drive rod seated control member automatically causes when the control member Exerts force on the outer or inner hook leg. After the control element can be swung open from the handle transferred into further closing positions that characterize the respective window become. In any case, the position of the control element is in the closed position set in the hook opening of the hook lever.

Fig. 1

einen Querschnitt durch die in Andrucklage aneinander befindlichen beiden unteren Holme eines Flügels und eines Rahmens von einem Fenster im Bereich einer erfindungsgemäßen Verschlußvorrichtung, wobei die Schnittführung durch die Schnittlinie I-I der in

Fig. 2

gezeigten Verschlußvorrichtung zu erkennen ist, bevor diese am Fenster befestigt worden ist, wobei in Fig. 2 ein horizontaler Längsschnitt durch die erfindungsgemäße Verschlußvorrichtung längs der Schnittlinie II-II von Fig. 1 dargestellt ist, und zwar in einer Freigabeposition zwischen dem Steuerglied und dem Gegenglied der Vorrichtung zeigt,

Fig. 3

einen der Fig. 2 entsprechenden Längsschnitt, wo sich das Steuerund das Gegenglied in ihrer Schließposition befinden,

Fig. 4

in einer mit Fig. 2 und 3 ausgerichteten Position einen Horizontalschnitt durch das Steuerglied in Draufsicht auf die Treibstange längs der Schnittlinie IV-IV von Fig. 1, wobei benachbarte, in Fig. 1 erkennbare Bauteile weggelassen worden sind,

Fig. 5

einen vertikalen Längsschnitt durch die in Fig. 1 gezeigte Vorrichtung, wenn sich das bewegliche Steuerglied in einer gegenüber Fig. 2 verschobenen Stellung befindet,

Fig. 6,

in einem gegenüber Fig. 5 verkleinerten Maßstab, eine horizontale Schnittansicht durch das Steuerglied längs der Schnittlinie VI-VI von Fig. 5 und eine in Draufsicht auf das ruhende Gegenglied des erfindungsgemäßen Verschlusses, wobei der Rahmen-Holm nicht mit dargestellt wurde, und

Fig. 7,

ebenfalls unter Weglassung des Rahmens und der Befestigung, die Unteransicht des in Fig. 5 gezeigten Gegenglieds, und zwar in der dort durch den Pfeil VII gekennzeichneten Blickrichtung.

Further measures and advantages of the invention result from the subclaims, the following description and the drawings. In the drawings, the invention is shown in one embodiment. Show it:

Fig. 1

a cross-section through the two lower spars of a wing and a frame of a window in the area of a locking device according to the invention located in the pressure position against each other, the cut through the section line II of the in

Fig. 2

Shown locking device can be seen before it has been attached to the window, in Fig. 2 is a horizontal longitudinal section through the locking device according to the invention along the section line II-II of Fig. 1 is shown, in a release position between the control member and the counter member the device shows

Fig. 3

2 corresponding longitudinal section, where the control and the counter member are in their closed position,

Fig. 4

in a position aligned with FIGS. 2 and 3, a horizontal section through the control member in a top view of the drive rod along the section line IV-IV of FIG. 1, adjacent components recognizable in FIG. 1 having been omitted,

Fig. 5

2 shows a vertical longitudinal section through the device shown in FIG. 1 when the movable control member is in a position displaced with respect to FIG. 2,

Fig. 6

in a reduced scale compared to Fig. 5, a horizontal sectional view through the control member along the section line VI-VI of Fig. 5 and a top view of the stationary counterpart of the closure according to the invention, the frame spar not being shown, and

Fig. 7,

also with omission of the frame and the fastening, the bottom view of the counterpart shown in FIG. 5, in the direction of view indicated by the arrow VII.

In Fig. 1, the two spars of a wing 12 and a frame 11th shown when this is in a pressure position of the closed window are located. In the rebate area, the wing 12 has one shown in FIGS. 1 and 5 Longitudinal groove 13 in which a drive rod 15 is arranged. The drive rod 15 can by a handle not recognizable on the wing 12 in the sense of the double arrow 14 shown in FIG. 5 longitudinally displaced become; the arrow direction 14 thus determines the direction of the Longitudinal displacement. At least one control member sits on the drive rod 15 10, which is taken with this longitudinal displacement 14 and thereby can be transferred into different positions as shown in FIGS. 2 to 6 can. The control member 10 consists in the simplest case of a cylindrical Pin which, as can best be seen from FIG. 1, is vertical is attached to the drive rod 15, for. B. by riveting.

The longitudinal groove 13 in the wing 12 is closed by a cover rail 16, which, as shown in FIG. 5, has an elongated hole 17 through which the cylindrical control member 10 protrudes into the fold area. The maximum Displacement path 18 of the control element 10 can be seen from FIG. 4. The Elongated hole 17 in the cover rail 16 is of course long enough to the movement of the resulting from the displacement path 18 Control member 10 in the wing 12 not to hinder. On the drive rod 15 can sit any number of control elements 10, which is also a can have a different profile shape.

A counter member 20 is assigned to the control member 10 located on the wing 12, which consists of several components, one of which is a component is attached to a defined location of the frame 11. It goes without saying that, in reverse, the movable control member 10 on the frame 11 and the counter member 20 could be arranged on the wing 12.

As can best be seen from FIG. 2, the counter member 20 comprises a housing 21 which has a plurality of mounting holes 22 for passage of fastening screws 19 recognizable from FIG. 5. The fastening screws 19 anchor the housing 21 stationary on the frame 11. The housing 21 comprises an upper plate which can be seen in plan view in FIG. 6 23 with a longitudinal slot 24, in which the control member 10 at its Longitudinal displacement 14 can retract in certain positions. Internally of the housing 21 is essentially in the direction of displacement 14 extending slide guide 25 for a carriage 40, which, as can be seen 2 and 3, can reach different longitudinal positions. For thrust guidance 25 also includes an elongated hole 27 in a housing 21 belonging Bottom plate 26, as can be seen from the bottom view of FIG. 7 is. A mounting pin, seated on the slide 40, engages in the slot 27 41, which is a thrust movement of the carriage to be explained in more detail 40 outside 44 and inside 45 does not exclude, but for one captive cohesion with the housing 21 ensures. The mounting pin 41 can with the ends of the elongated hole marked with 42, 43 from FIG. 7 27 interact like a stop and thus a maximum extension and / or limit the insertion position of the slide 40.

Another component of the counter member 20 is at least one lever 30, which has a hook opening 33 and therefore hereinafter briefly "hook lever" should be designated. The hook lever 30 consists of a profiled Plate that runs parallel to the top plate 23 of the housing 21 and is connected to the carriage 40 via a pivot bearing 46, such as 5 emerges. The pivot bearing 46 is in a bearing sleeve 47, which is anchored in the carriage 40. The carriage 40 is together with the hook lever 30 mounted on it always together in the sense arrows 44, 45 of FIGS. 2 and 3 can be pushed out or pushed in. The sled 40 and the hook lever 30 thus form a common in the housing 21 displaceable structural unit, two of which in FIGS. 2 and 3 with 60 and 60 'designated longitudinal layers are shown.

In the present exemplary embodiment there are two hook levers of identical shape to one another 30, 30 'provided with each other in a mirror image their two hook openings 33, 33 'are positioned and together the same pivot bearing 46 of the carriage 40 are mounted. Because of their uniformity of shape is sufficient to describe only one hook lever 30, because this is also the case for the second hook lever 30 'applies. The components of the hook lever 30, 30 'are consequently identified by the same reference numerals, but for distinction those of the second lever 30 'are provided with a prime (').

The hook opening 33, 33 'is made up of two hook legs 31, 32 and 31', 32 'delimits between them the cross section of the control member Generate 10 corresponding free spaces. As explained in more detail with reference to FIG. 3 is, the hook lever 30 is formed with two arms and has one outer lever arm 36 each having a hook opening 33 or 33 ' and, on the opposite side of the pivot bearing 46, an inner one Lever arm 37, which has an inclination profile 38 or 38 'at its inner end owns. A spring force 58 acts on this inclination profile 38, 38 ' Spring force is generated here by a helical compression spring 50, which is arranged in an axial bore 48 of the carriage 40 and on a plunger 49 which is longitudinally displaceable in this bore 48. In order to the following effects are achieved.

If the cylindrical control member 10 can be seen in FIGS. 5 and 6 first position 51, which is also in Fig. 6 by a corresponding dash-dotted position is clarified, so is one over hinges on the frame 11 hinged wing 12 an unlocked position before where the wing 12 is freely movable relative to the frame 11. Then is the mentioned, from the carriage 40 and the two hook levers 30, 30 'formed unit in its extended position shown in FIG. 2 60. This is determined by the fact that the carriage 40 in the sense of the extension arrow 44 at most in the direction of a housing opening 28 of the housing 21 has moved. In Fig. 2 is the hatched pin 10 shown in a later second position and therefore in this consideration to think away first. The extension position 60 of the assembly is through the end stop 42 already described and shown in FIG. 7 of the mounting pin 41 belonging to the slide 40 is limited. Both plate-shaped Hook levers have a defined outline profile, which how can best be seen from FIG. 3, by the hook opening 33 directed longitudinal edge produces a projection 39 which over a Plate widening of the hook lever 30 in the mentioned outer hook leg 31 passes.

The outer hook legs are in the extended position 60 of FIG. 2 31 and 31 'of the two hook levers 30, 30' in a housing extension 29. By the spring force already generated by the compression spring 50 58 arise on the inclination profiles 38, 38 'mirror images of each other Torques, which are illustrated by the rotation arrows 34, 34 'in FIG. 2 Generate pivotal movements on the hook levers 30, 30 'and this spread apart. As a result, the outer hook legs 31, 31 'in the housing extension 29 pressed away from each other and come to lie in front of shoulders 59 and 59 'with their two projections 39, 39', which, as shown in FIG. 3, limit the housing extension 29 towards the inside. In their spread position 34, 34 'of FIG. 2, therefore, reach behind the shoulders 59, 59 'the two projections 39, 39' and thus also prevent an uncontrolled Insert the assembly. The extension position 60 is thus the Unit also with respect to an insertion movement indicated by arrow 45 precisely defined.

Is now the control member 10 in its in by operating the handle 4 and 2 transferred drawn position 52, it comes across against the two overlapping inner hook legs 32, 32 ' of the two hook levers 30, 30 '. In the spread position the hook lever 30, 30 'remains between the two outer hook legs 31, 31 a sufficient passage 57 shown in FIG. 2 for the control member 10. The inner hook legs 32, 32 'have a mutually opposite Slant on. With further longitudinal displacement 14 of the drive rod 15 arrives the control member 10 in the dashed line in Fig. 4 third position 53, wherein a force is exerted on the inclined inner hook legs 32, 32 ', a torque opposite to the aforementioned spreading movement 34, 34 ' generated and the two hook levers 30, 30 'in the sense of the arrows 35, 35 'of Fig. 3 pivots against each other. This will release the two hook levers 30, 30 'folded together and close the control member 10 like pliers with their two hook openings 33, 33 'between them on all sides. During this folding movement 35, 35 ', the two projections 39, 39 'on the longitudinal edges of the two hook levers 30, 30' with their projections 39, 39 'from the associated shoulders 59, 59' of the housing extension 29 highlighted. As a result, the structural unit in the direction of arrow 45 3 are inserted further and finally reaches the in Fig. 3 drawn in solid lines and dash-dotted lines in Fig. 4 fourth position 54.

In Fig. 3 is already the full insertion position 60 'of the slide 40 and the two hook levers 30, 30 'existing unit. When collapsing 35, 35 'of the two hook levers 30, 30' the Tappet 49 pushed into the slide bore 48 via the inclination profile 38, 38 ' and thereby compressing the compression spring 50 there. The the spring force 58 generated by it is compared to the situation in FIG. 2 has grown and consequently exercises a spreading movement 34, 34 ' higher torque, but this can be in the insertion position 60 ' not impact. When inserting 45, the hook opening slides 33 and 33 'facing longitudinal edge 56 and 56' of the two hook levers 30, 30 'on a guide surface 61 already recognizable in FIG. 2 and 61 'inside the housing 21 along. In the insertion position 60 ' 3 hold the opposing guide surfaces 61, 61 'over the lever longitudinal edges 56, 56' the two hook levers 30, 30 'pressed together in the folding position. The spring force 58 the compression spring 50 is thereby pivotally ineffective.

In Fig. 3, the full closed position of the control member 10 is in the opposite member 20 before. The control member 10 is on all sides by the two hook levers 30, 30 'included and therefore occupies a defined position there. The wing is therefore via the closure device 10, 20 according to the invention 12 locked on the frame 11 particularly reliably.

As indicated by dash-dotted lines in FIG. 4, the control element 10 could by a further longitudinal displacement 14 of the drive rod 15 to one another dot-dash position 55 can be inserted without this affects the reliability of the locking of the sash and frame. This can be done by dimensioning the elongated hole sufficiently large 27 by using the one already mentioned and shown in FIG End stop 43 is set sufficiently far inwards.

The reversal of the closure device from that shown in FIG. 3 5 is in the full release position shown in FIG. 5 in a manner opposite to the movement described above. Doing so the drive rod 15 pushed back in the direction of arrow 14, wherein in the first movement phase, up to position 53 of control element 10 of FIG. 4, the spreading force 58 of the compression spring 50 relative to the two hook levers 30, 30 'remains ineffective. There is a contact between the longitudinal edges of the lever 56, 56 'on the mentioned housing guide surfaces 61, 61'. Only when the widened outer hook legs 31, 31 'the housing extension described 29 of FIG. 2, the spring force 58 can have an effect and cause the spreading movement 34, 34 'of the two hook levers 30, 30'. Then there is again a sufficiently large passage 57 between the two outer hook legs 31, 31 'before to the control member 10 in its outermost 4, 5 and 6 to transfer position 51. The control member 10 is located only again outside the housing 21. The wing 12 is off the frame 11 unlocked.

Reference symbol list:

10th

Control link

11

frame

12th

wing

13

Longitudinal groove in 12

14

Longitudinal arrow of 15 or 10

15

Connecting rod

16

Cover rail

17th

Elongated hole in 16th

18th

Displacement of 10 (Fig. 4)

19th

Fixing screw for 20

20th

Counterpart

21

Housing of 20

22

Mounting hole for 19

23

Top plate from 21

24th

Longitudinal slot in 23

25th

Thrust guide in 21

26

Lower plate from 21

27

Elongated hole in 26

28

Case opening from 21

29

Housing expansion at 28

30, 30 '

Hook lever

31, 31 '

outer hook leg of 30 or 30 '

32, 32 '

inner hook leg of 30 or 30 '

33, 33 '

30 or 30 'hook opening

34, 34 '

Swiveling movement of 30 or 30 ', spreading movement

35, 35 '

Swiveling movement of 30 or 30 ', folding movement

36

outer lever arm of 30

37

inner lever arm of 30

38, 38 '

Tilt profile at 37 of 30 or 30 '

39, 39 '

tooth-like projection at 30 or 30 '

40

carriage

41

Mounting pin for 40 to 21

42

first end stop in 26

43

second end stop in 26

44

Arrow of the extension movement of 40

45

Arrow of the insertion movement of 40

46

Pivot bearing for 30 and 30 '

47

Bearing sleeve for 46

48

axial bore in 40

49

Ram in 48

50

Compression spring in 48

51

first position of 10 (unlocked position)

52

second position of 10

53

third position of 10

54

fourth position of 10 (locked position)

55

fifth position out of 10

56, 56 '

Long edge of 30 or 30 '

57

Passage for 10th

58

Spring force of 50

59, 59 '

Shoulder at 29

60

Extension position of the unit from 40, 30, 30 '

60 '

Insertion position of the assembly from 40, 30, 30 '

61, 61 '

Guide surface of 30 or 30 'in 21

Claims (16)

1. Closing device for windows, doors, or the like, with a moveable stud-shaped control member (10) on the casement (12) or on the frame (11) of the window on the one hand, and with a stationary counter member (20) on the frame (11) or casement (12) on the other hand, wherein although the moveable control member (10) is fixed to a connecting rod (15), said connecting rod (15) is longitudinally displaceable (14) by means of a handle, and the control member (10) is displaceable between at least a closure position and a releasing position in relation to the stationary counter member (20), characterised in that the counter member (20) is provided with at least one catch lever (30, 30') having a catch aperture (33, 33'), pivotable by means of the control member (10) transversely to the plane of displacement (14) of the stud-shaped control member (10), in that its side facing away from the pivot bearing (46) of the catch lever (30, 30') is delimited by an outer catch limb (31, 31'), and in that in the closure position of the device, the catch lever (30, 30') is pivoted on the control member (10) until its catch aperture (33, 33') picks up the control member (10) and its outer catch limb (31, 31') engages in front of the control member, while, in the releasing position of the device, the catch lever (30, 30') is pivoted away from the control member (10) until its outer catch limb (31, 31') leaves the plane of displacement (14) of the stud-shaped control member (10).
2. Device according to claim 1, characterised in that the counter member (20) has a stationary housing (21) with a thrust guide (25) for the pivot bearing (46) of the catch lever (30, 30'), and in that during displacement (14) between the releasing and closing position, the control member (10) carries the catch lever (30, 30') with it, and compels its displacement in the housing between a pushed-out position (60) distinguishing the releasing position, and a pushed-in position (60') determining the closing position.
3. Device according to claim 2, characterised in that the catch aperture (33, 33') is delimited on its side facing towards the pivot bearing (46) by an inner catch limb (32, 32') against which the control member (10) impacts when the control member (10) is pushed into (45) the housing (21), and passes from its releasing position into its closing position, while the control member (10) presses against the outer catch limb (31, 31') by contrast, when the control member (10) comes out (44) of the housing (21) and is transferred from its closing position into its releasing position.
4. Device according to claim 2 or 3, characterised in that - seen in the pushed-out position (60) and/or in the pushed-in position (60') of the catch lever (30, 30') - the inner and/or the outer catch limb (32, 32'; 31, 31') is inclined with respect to the plane of displacement (14) of the stud-shaped control member (10), whereby the force exerted by the control member (10) during displacement (14) on the catch limb (32, 32'; 31, 31') has a force component which effects the pivoting (35, 35') of the catch lever (30, 30') towards the control member (10) and/or the pivoting away (34, 34') of the catch lever (30, 30').
5. Device according to one or more of claims 2 to 4, characterised in that the housing (21) has, in addition to the thrust guide (25) for the pivot bearing (46), another guide surface (61, 61') for the catch lever (30, 30'), and in that when displacement takes place between its pushed-out and pushed-in position (60, 60') the catch lever (30, 30') slides along this guide surface (61, 61'), and at least in the pushed-in position, the guide surface (61, 61') keeps the catch lever (30, 30') pivoted towards (35, 35') the control member (10).
6. Device according to one or more of claims 1 to 5, characterised in that the catch lever (30, 30') has a projection (39, 39') on its long side facing away from the catch aperture (33, 33'), and in that the housing (21) has a shoulder (59, 59') in front of which the projection (39, 39') engages in the pivoted away position (34, 34') of the catch lever (30, 30'), and in this way fixes the pushed-out position (60) of the catch lever (30, 30').
7. Device according to one or more of claims 2 to 6, characterised in that a spring (50) is integrated into the housing (21), which spring seeks to transport the catch lever (30, 30') into its pivoted away position (34, 34').
8. Device according to one or more of claims 1 to 7, characterised in that the catch lever (30) is configured with two arms (36, 37), composed of an outer catch arm (36) located on one side of the pivot bearing (46), which outer arm is provided with the catch aperture (33), and an inner catch arm (37) arranged on the other side of the pivot bearing (46), upon which inner arm the spring (50) acts.
9. Device according to one or more of claims 1 to 8, characterised in that although the force (58) of the spring (50) within the housing (21) is substantially parallel to the thrust guide (26) of the lever (30, 30'), it acts via an angled profile (38, 38') upon the end of the inner catch arm (37), and thereby exerts a turning moment upon the catch lever (30, 30').
10. Device according to one or more of claims 1 to 9, characterised in that the pivot bearing (46) of the catch lever (30, 30') is seated on a slide (40), and the slide (40) is located in the thrust guide (25) of the housing (21).
11. Device according to claim 10, characterised in that the spring (50) is integrated into the slide (40).
12. Device according to claim 10 or 11, characterised in that between the thrust guide (25, 27) in the housing (21) and the slide (40), end stops (42, 43) are provided which delimit the maximum push out and/or push in positions (60, 60') of the catch lever (30, 30') in the housing (21).
13. Device according to one or more of claims 1 to 12, characterised in that the counter member (20) is provided with two catch levers (30, 30') pivotable in a mirror image of each other, with catch apertures (33, 33') facing one another, and a common control member (10) on the connecting rod (15) is allocated to the two catch apertures (33, 33'), and in the closing position, the two catch levers (30, 30') are folded (35, 35') one upon the other, and hold between them the control member (10) of the connecting rod (15) with their two catch apertures (33, 33'), but in the releasing position the two catch levers (30, 30') are spread apart (34, 34') from one another and produce between their outer catch limbs (31, 31') a passage (57) for the control member (10).
14. Device according to claim 13, characterised in that in the spread apart position (34, 34') the inner catch limb (32, 32') of the two catch levers (30, 30') overlap one another, and are angled in opposite directions to one another.
15. Device according to one of claims 13 or 14, characterised in that the two catch levers (30, 30') are provided with a common pivot bearing (46) in the housing (21) or on the slide (40).
16. Device according to one or more of claims 13 to 15, characterised in that although two guide surfaces (61, 61') in the housing (21) are allocated to the two catch levers (30, 30'), which, in the pushed-in position (60') hold the two catch levers (30, 30') between them, and keep them folded against one another (35, 35'), only one common spring (50) is provided for the two catch levers (30, 30'), which seeks to spread (34, 34') the two catch levers (30, 30') apart from one another.

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