EP1088144B1 - Closure, especially for vehicles - Google Patents

Description

The invention relates to a closure in the preamble of claim 1 specified type. In vehicles, the closure can for example on a hinged rear window can be applied. A lock belongs to Closing head and a lock that when folding the rear window together couple. In the coupling case, a resilient locking member engages behind an axial shoulder of the locking head, which indicates the locking position of the lock. To the The locking member is uncoupled into a via a reset member Release position transferred, where the locking head comes out of the lock can be uncoupled and the rear window can be moved into its unfolded position.

In the known lock, the closing head has at its free end section a control surface inclined to the axial direction of movement, which the Task has the locking member when engaging the closing head against it To push the spring force away. The locking member was subjected to axial loads. The Pushing the locking member away from the closing head generated friction and thus Wear. After prolonged use, there were faults due to wear and tear could only be mitigated with difficulty by readjustment. There was also an axial in the castle spring-loaded sensing element, which had the task of a sensor co. The sensor was responsible for other functions in the vehicle. e.g. Activate the anti-theft alarm system. So the sensing element had a separate function compared to the blocking element. Both components had nothing to do with each other.

The invention has for its object an inexpensive, space-saving Develop closure of the type mentioned in the preamble of claim 1, the is characterized by high reliability and low susceptibility to faults. this will according to the invention by those stated in the characterizing part of claim 1 Measures achieved, which have the following special importance.

In the invention, the sensing element takes on the new function, a locking means for to be the locking link. As long as the closing head is uncoupled, the sensing element locks the release position of the locking member. Wear-free engaging is possible and achieve decoupling of the closing head without the locking member from the closing head should be moved. Rather, the movement of the locking member only occurs when when the full coupling position of the locking head is achieved in the lock. That happens automatically. During insertion, the closing head hits the sensing element, which is due to its axial suspension follows this axial movement of the closing head. The moving sensing element releases the lock, causing the locking element through its radial Spring load is transferred to its locked position where there is the closing head engages behind. The locking element is automatically locked by the sensing element back on when the locking member in its actuation of the reset member Release position is returned. Then the initial state is reached again.

Fig. 1 -

im Entkupplungsfall - einen Schnitt durch das Schloss des erfindungsgemäßen Verschlusses längs der Schnittlinie II - II von Fig. 3 oder 4.

Fig. 2

einen Axialschnitt durch ein zum erfindungsgemäßen Verschluss gehörenden Schließkopf, der an einem klappbeweglichen Teil, nämlich einer Heckscheibe eines Fahrzeugs, befestigt ist,

Fig. 3

die Draufsicht auf das Schloss in Blickrichtung III von Fig. 1,

Fig. 4

eine zwar der Fig. 3 entsprechende Draufsicht auf das Schloss, aber nachdem die obere Deckplatte vom Schlossgehäuse entfernt worden ist,

Fig. 5

einen weiteren Schnitt durch das Schloss längs der zu Fig. 1 senkrechten Schnittlinie V - V von Fig. 3 oder 4, nachdem ein zum Verschluss gehörender Schließkopf eingekuppelt worden ist und

Fig. 6,

in einer der Fig. 1 entsprechenden Schnittdarstellung, den Kupplungsfall des Schließkopfs im Schloss gemäß Fig. 5, wofür dort die entsprechende Schnittlinie VI - VI eingezeichnet ist.

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

Fig. 1 -

in the case of uncoupling - a section through the lock of the closure according to the invention along the section line II - II of FIG. 3 or 4.

Fig. 2

3 shows an axial section through a closing head belonging to the closure according to the invention, which is attached to a hinged part, namely a rear window of a vehicle,

Fig. 3

the top view of the castle in viewing direction III of Fig. 1,

Fig. 4

3, but after the upper cover plate has been removed from the lock housing,

Fig. 5

a further section through the lock along the section line V - V of FIG. 3 or 4 perpendicular to FIG. 1 after a closing head belonging to the closure has been coupled in and

Fig. 6

In a sectional view corresponding to FIG. 1, the coupling case of the closing head in the lock according to FIG. 5, for which the corresponding section line VI - VI is drawn.

In the exemplary embodiment, the closure 10, 20 according to the invention is switched off Fig. 6 apparent folding rear window 30 of a motor vehicle used. The rear window 30 is marked along the 31 in FIG. 6 arcuate path foldable. The lock consists of a lock 10 - with respect to the disk movement 31 - the part 40 of the rest of the Motor vehicle is arranged, namely on a dash-dotted line in Fig. 6 indicated rear part 40 of the motor vehicle. But there is still a clasp Closing head 20 which is attached to the disc 30 and with it along the Folding movement path 31 is performed. In the final phase of its folding motion 3 1, the closing head 20 executes a through the tangent according to the arrow 32 of FIG.

6 specific movement, which, for easier description of the rest Movements below as "axial direction of movement" or "axial Decoupling movement "of the closing head 20 is to be designated. The 6 is the plane of the folding movement 31 of the disk 30 with the closing head 20 attached to it.

The movable component 20 referred to as the "closing head" can be in the form of an axial one Projection be formed with a non-circular radial profile. In the present case but this component 20 is rotationally symmetrical to its in the direction of movement 32 pointing axis 33 designed. The closing head 20 can, as shown in FIG. 2, divided into four sections 21 to 24. This includes a front end portion 21 of the is conical here. The end section 21 tapers to the front End 25 of the closing head 20. The end 25 is spherical. The conical end portion 21 creates an inclined control surface 27, which because of the mentioned rotationally symmetrical design of the closing head 20 arises on all sides.

This end section 21 is followed by a constriction 22 in the closing head 20, which on Transition to the end section 21 creates an undercut axial shoulder 26. Behind the constriction 22 there is a cylindrical section 23 which, for Constriction 22, one pointing in the direction of movement 32 of the closing head 20 Has chamfer 28. This inlet slope 28 is also because of the rotationally symmetrical design of the closing head 20 mentioned several times formed all round to the locking head axis 33.

Finally, at the opposite end of the closing head 20 there is an axial one Mounting pin 24 provided in a receptacle 34 of the rear window 30th is attached. This attachment in the receptacle 34 takes place indirectly via a Elastomeric material 35 existing bush 36 into which a threaded sleeve 37 is integrated. In the internal thread of this threaded sleeve 37 is the one External thread 44 provided mounting pin 24 screwed. The socket 36 is seated in a disk button 38, which has a seal 43 in the disk holder 34 sitting. The disk button 38 is supported with a flange on one side of the Rear window 30 from and is on the window 30 by one on the opposite locking ring supporting circlip 39 attached. The The securing ring 39 is attached to the circumference of a bush 36 receiving hollow shaft from the disk button 38, which, with interposition the seal 43, sits in the disc holder 34.

The screw connection 37, 44 of the closing head 20 allows the closing head 20 in its axial length 42 shown in FIG. 2 with respect to the disk 30 exactly einzujustieren. For this purpose, the closing head 20 has one at its front end 25 out-of-round plug-in receptacle 29 for a to be described in more detail from FIG. 6 apparent turning tool 50.

The lock 10 comprises, as can best be seen from FIG. 4, a locking member 11, a sensing member 12, a reset member 13 and a motor actuator 14 for the Reset member 13. These members 11 to 14 are inside a two-part Housing 19, 49. As best shown in FIG. 1, the housing comprises one Housing shell 19 which is closed by a housing cover 49. The Housing cover has a coupling opening 41. This coupling opening 41 is as can be seen from the plan view of FIG. 3, circular coaxial to the axis 33 also shown in FIG. 1, which, as said, by the axial direction of movement 32 of the closing head 20 is determined. The Coupling opening 41 is of a tubular one recognizable from FIGS. 1 and 3 Guide 45 enclosed, the clear width of the cross section 46 of the cylindrical Section 23 of the closing head 20 is adapted. The cross section 46 is somewhat larger than the maximum cross-section 47 of the conical end section as can be seen in FIG. 2 21 of the closing head 20 is formed.

When inserting the closing head 20 into the coupling opening 41 of the lock 10 in In the sense of arrow 32, it can already close at the conical end section 21 Alignment movements come towards the lock 10. The described inclined control surfaces 27 of the conicity act with the coupling opening 41 enclosing tubular extension 45 together. A centering of the Closing head 20 occurs in particular through the inlet slope 28 on the following cylindrical portion 23 of the closing head 20. The tubular extension 45 acts as a guide receptacle for the cylinder section 23 and ensures its coaxial position in the coupling case shown in FIG. 6; the cylinder section 23 is supported its circumference on the inner surface of the guide receptacle 45 from the housing 10. The bushing 36 has a coaxial ring extension 48 which can be seen in FIG 6 elastically encloses the tube extension 45 on the lock side. in the 6 thus creates a seal at 45, 48 of the interior of the lock against water and dirt from the environment.

The elastomer material 35 of the bush 36 primarily ensures a radially elastic Holding of the closing head 20 on the disc 30. After prolonged use of the Motor vehicle can namely the hinge for the above Folding movement 31 of the rear window 30 due to wear to an adjustment of the folding movement path 31 lead. So that the aforementioned radial Alignment movement on the control surfaces 27 and the inlet slopes 28 during the Coupling can take place, the mounting pin 24 of the closing head 20 in the Bushing 36 is illustrated by the radial double arrow 58 in FIG. 2 Carry out alignment movement. The mounting pin 24 is because of The bushing material 35 is held in the bushing 36 in a radially elastic manner.

4, the locking member 11 is designed as a two-armed 51, 52 lever. This lever sits on a pivot axis 53 lying parallel to the axis 33 makes the lever arms 51, 52 radially movable to the axis 33. At the locking member 11 acts a two-leg locking spring 56 on the lever arm 51 by the arrow 54 illustrated in FIG. 4 exerts spring force. The lever arm 51 is therefore in the Suspended essentially in the direction of the axis 33. In the apparent from Fig. 1 to 4 If the closing head 20 is uncoupled, the spring force 54 cannot impact because the lever arm 51 by a lock 61, 62 in its 4 is held. This position proves to be "Release position" of the locking member 11.

This is possible because the sensing element 12 in the invention as a "locking means" for the locking member 11 acts. The sensing element 12 is designed as a one-armed lever, whose pivot axis 55 is perpendicular to the pivot axis 53 of the locking member 11. While the sensing element 12 in the plane of the drawing in FIG. 1 in the direction of the arrow 60 is pivotable, is the one indicated by arrow 57 in FIG. 4 Pivoting movement of the locking member 11 perpendicular to it, namely in the plane of the drawing of Fig. 4. This means that the sensing member 12 axially, ie parallel to the axis 33 of Fig. 1, but the actuator 11 are pivotable radially to the axis 33. That too Sensor element 12 is spring-loaded, namely by an essentially axial, by means of Arrow 63 of Fig. 1 illustrates spring force. A compression spring 64 is used for this purpose one end on the bottom of the housing shell 19 and the other end on the sensing element 12 supported. The sensing element 12 is equipped with a cam 62 here Holding element provided, which, due to the spring load 63 of the sensing member 12 Fig. L shows, is too spring-loaded on the locking member 11 and in its release position engages in a recess 61 which serves as a counter-holding element for the cam 62. The cam 62 has a shoulder with which it with a counter shoulder 65 in Inside the recess 61 comes to rest. In this from FIGS. 1 and 4 Obvious release position of the locking member 11, the closing head 20 in the sense of the arrow 32 coupled in the lock 10 or in the sense of the counter arrow 32 'of Fig. 1 are uncoupled. In the last phase of the clutch movement 32 it comes but for the following reason to release the locking 61, 62.

When engaging 32 of the closing head 20, it bumps against the sensing element 12 comes to an axial pivoting movement in the sense of the aforementioned Pivoting movement arrow 60 from FIG. 1, against the spring load 63 of the sensing element 12. As a result, the cam 62 is removed from the recess 61 in the locking member 11 pulled out. Then the locking member 11 is free and can in the sense of it force arrow 54 of FIG. 4 acting radially against the arrow 57 there Axis 33 are moved. As a result, as can be seen from FIG. 5, the Lever arm 51 in the constriction 22 from the closing head 20. The lever arm 51 engages behind the axial shoulder 26 of the closing head 20. The closing head 20 is in his Coupling position secured in lock 10. The apparent from Figs. 5 and 6 Pivot position of the locking member 11 proves to be the "locking position". On Decoupling in the sense of arrow 32 'illustrated in FIG. 6 is initially not possible. For this purpose, the above-mentioned reset element 13 must be activated, what happens here through a motorized actuator 14.

As can be seen from FIGS. 4 and 5, here the reset member 13 consists of a Control pin 15 which sits on a worm wheel 16. The worm wheel 16 is with its worm wheel axis 66 in the housing 19, 49 rotatably and is under the Effect of a worm gear spring 67 Worm gear 16 held in the initial rotational position shown in FIG. 4, where. when the release position of the locking member 11 is there, normally a radial distance to the second arm 52 of the locking member 11. But if they 5 and 6 apparent locking position of the locking member 11 is where the first-mentioned working arm 51 of the locking member 11, the coupling position of the closing head 20 secures, then the second lever arm 52 has towards the control pin 15 pivoted. If necessary, the control pin 15 can then also serve as a stop for the Serve pivoting movement 57 of the locking member 11. 5 and 6 is the disk 30 closed.

An anti-theft alarm system can be in the folded position of the rear window 30 be effective. The. The anti-theft alarm system can be queried via a Microswitch 70 take place, the switching actuation of a by a spring 72 or the like. Actuable switch button 71 takes place. This microswitch 70 cooperates the second lever arm 52 of the locking member 11, which acts as an actuating arm together. If you want to decouple the closing head 20, the actuator 14 must be put into effect.

The actuator 14 for the reset member 13 consists of an actuator, namely a preferably electrically driven motor 18 with a worm 17, which with the worm wheel 16 is engaged by the reset member 13. To actuator 14 another one is connected to the electrical circuit of the motor 18 Actuation switch with suitable control electronics. If the engine 18 is turned on, the worm wheel 16 over the worm by one Angular amount against the spring load 63 acting on the worm wheel 16 Worm gear spring 67 twisted. This rotary movement is in Fig. 4 by the Arrow 68 illustrates. In the final rotational position of the worm wheel 16 comes Control pin 15 in the rotary position 15 'shown in phantom in FIG. 4. By taking the actuating arm 52 becomes the locking member 11 in the direction of arrow 57 'of Fig. 4, pivoted back against the acting spring force 54. The locking member 11 thereby reaches the release position of FIG. 4. With the pivoting back movement 57 ' of the working arm 51, the recess 61 there returns to the axial orientation with the cam 62 seated on the sensing element 12, which is why these elements 61, 62 come into engagement with one another, as shown in FIGS. 1 and 4. The intervention of the Cam 62 in the recess 61 is like a snap; the sensing element 12 is in L pivoted back by arrow 60 'of Fig. L by its spring loading 63. In order to the sensing member 12 has the locking of the locking member 11 in its release position effective set. The closing head 20 can be in the direction of the arrow 32 'of FIG. 6 be uncoupled.

As soon as the control pin has reached its rotational end position 15 ', the actuator 14 off. This can be done automatically by the automatic control system. The motor 18 is no longer energized. Then that extends from the worm gear spring 67 in the sense of the arrow 69 of FIG. 4 exerts a rotational restoring force around the worm wheel 16 to return to its initial rotational position, where the control pin is in the drawn drawn in Fig. 4 layer 15. The existing intervention between the worm wheel 16 and the worm 17, this can Do not prevent the rotary reset movement 68 '; the engagement between 16, 17 is not self-locking.

1 and 4, the sensing element 12 has an opening 73 in which the closing head 20 partially engages with its front end 21. The Breakthrough 73 in the present case consists of an elongated hole, the one from FIG. 3 apparent large hole axis 74 expediently with the level of Folding movement 31 (see Fig. 6) of the disc 30 is aligned. This 3 is identical to the section line II - II. At the The closing head 20 engages with a partial height 75 shown in FIG. 6 its conical front section 21, as can be seen from FIG. 6. The Immersion depth is determined by the conicity of the front section 21 and by the from FIG. 3 recognizable small hole width 76 of the opening 73 determined. By the from Fig. 5 and 6 visible immersion of the closing head 20 in the opening 73 Reduce the overall height of the lock housing 10, 49. The aforementioned orientation of the The large hole axis 74 bears the curvature of those shown in FIG. 6 Folding movement 31 from the closing head 20 attached to the disk 30; its front end 21 can be in the last one, which comes into contact with the sensing element 12 Coupling phase shift radially in slot 73. Because in the same Level of the folding movement also the aforementioned pivoting movement 60, 60 'of Completes sensing element 12, is with the elongated hole 73 also when pivoting 60, 60 ' resulting corresponding radial displacement between the sensing member 12 and the closing head front end 21 is taken into account.

Finally, the invention is characterized in that the folded position of the. Rear window 30 with respect to the stationary rear part 40 of the motor vehicle very simple way to set very precisely. This setting can namely in Coupling case of the locking head 20 through the lock 10 through. To the housing shell 19 of the lock 10 has a passage 77 for suitable Turning tools 50. The passage also extends through any other the way to the lock head 20 located lock members. That too in Sensing member 12 provided slot 73 can serve as a passage. With this Tool 50 can be the axial distance described above, which can be seen in FIG. 2 42 from front end 25 of closing head 20 with respect to disk 30. The Tool 50 has a plug end 59, the outline of which is mentioned at the beginning Plug receptacle 29 is adapted to the front end 25 of the closing head 21. 6 indicated by the plug connection of the two connecting halves 29, 59 can be exerted via the turning tool 50, which leads to a defined screwing of the locking head 20 in the thread 37 of the Socket 36 leads.

Reference symbol list:

10

first part of the lock, lock

11

Locking element, two-armed lever

12

Sensor element, one-armed lever

13

Reset element for 11

14

Actuator for 13

15

Control pin of 13 (starting position)

15 '

Rotational end position of 15 (Fig. 4)

16

Worm gear from 13

17

Snail from 14

18

Engine from 14

19

first part of the housing, housing shell

20

second part of the lock, closing head

21

front end portion of 20, conical front end

22

Constriction in 20

23

cylindrical section of 20

24

axial mounting pin of 20

25

front end of 20

26

Axial shoulder on 21

27

inclined control surface on 21

28

Entry slope on 23

29

Plug receptacle in 25, first half of a plug connection

30

folding rear window

31

Folding movement path of 30

32

Arrow of the axial engagement movement from 20 in 10

32 '

Counter arrow for the uncoupling movement from 20 out of 10 (FIG. 1)

33

Axis of 20

34

Inclusion in 30 for 24

35

Elastomer material from 36

36

Socket for 24

37

Threaded sleeve in FIG. 36, first part of the screw connection of FIG. 20 with respect to 30

38

Disc button on 30

39

Circlip for 38

40

stationary part of the motor vehicle, rear part

41

Coupling opening for 20 in 49

42

axial distance between 25 and 30

43

Seal between 38, 34

44

Male thread of 24, second part of the screw connection between 20, 30

45

tubular attachment, guide seat at 41

46

Cross section of 23

47

maximum cross section of 21

48

Ring attachment on 36 for 45

49

second part of the housing of 10, housing cover

50

Turning tool for 20

51

first lever arm of 11, working arm

52

second lever arm of 11, adjusting arm

53

Swivel axis of 11

54

Arrows of the spring force of 51

55

Swivel axis of 12

56

Locking spring at 11 (Fig. 4)

57

Arrow of the pivoting movement of 11 (Fig. 4)

57 '

Opposite arrow of the return movement of 11 (FIG. 4)

58

Alignment arrow from 24 to 36 (Fig. 2)

59

Plug on 50th second half of a plug connection (Fig. 6)

60

Arrow of the pivoting movement of 12 (Fig. 1)

60 '

Opposite arrow of the backward pivoting movement of 12 (FIG. 1)

61

Locking, recess in 11 for 62, counter holding element

62

Locking, cam in 12 for 61, holding element

63

Arrow of the spring load of 12 (Fig. 1)

64

Compression spring for 12

65

Counter shoulder from 61 for 62

66

Worm-wheel axle

67

Worm gear spring for 66

68

Arrow of rotation from 15 in 15 '

68 '

Counter arrow of the rotary reset movement from 15 'to 15

69

Arrow of the rotational restoring force of 16

70

Microswitch for 52

71

Switch button from 70

72

Leaf spring of 70

73

Breakthrough in 12 for 20, slot

74

large hole axis of 73

75

Partial height of 21 (FIG. 6)

76

small hole width of 73

77

Passage in 19 for 50 (Fig. 6)

Claims (12)

1. Closure between the movable and the stationary part of a door, flap or the like, particularly in vehicles, such as a hinged rear window (30) of a motor vehicle,
   comprising a lock (10) on the one, in particular stationary part (40) of the flap
   and a closing head (20) movable (31) axially (32) relative thereto on the other, in particular movable part (30) of the flap,
   wherein the closing head (20) has an undercut axial shoulder (26) for a radially movable (57, 57') locking member (11), which is spring-loaded towards its movement axis (33), of the lock (10)
   and the locking member (11) in the coupling situation of the closing head (20) engages behind the axial shoulder (26) and is then situated in a locking position,
   and the lock (10), in addition to the locking member (11), has an axially spring-loaded (63) sensing member (12) and a restoring member (13) for the locking member (11),
   wherein the sensing member (12) projects into the axial path of motion (32) of the closing head (20) and is actuated by the closing head (20),
   while the restoring member (13) moves the locking member (11) into a release position relative to the closing head (20), in which the closing head (20) may be uncoupled,
   characterized in that the sensing member (12) is an arresting means for the locking member (11) and holds the locking member (11) in its release position so long as the closing head (20) is uncoupled,
   that the axial motion (60) of the sensing member (12) arising during coupling (32) of the closing head (20) releases the arresting means (61, 62), with the result that the radial spring loading (54) moves the locking member (11) into its locking position,
   and that the radial return motion (57') of the locking member (11) arising upon actuation of the restoring member (13) activates the arresting means of the sensing member (12) and arrests the locking member (11) in its release position.
2. Closure according to claim 1, characterized in that the sensing member (12) has a holding element (62) for a counterpart holding element (61) provided on the locking member (11),
   that the holding element (62) and the counterpart holding element (61) are in mutual engagement in the uncoupled state of the closing head (20) and hold the locking member (11) counter to its radial spring loading (54) in the release position
   and that during coupling (32) of the closing head (20) the holding element (62) of the sensing member (12) moves axially away from the locking member (11) at least to such an extent that it leaves the counterpart holding element (61) and releases the locking member (11).
3. Closure according to claim 1 or 2, characterized in that the sensing member (11) and the locking member (11) are pivotally supported levers, the swivelling motion directions (60, 60'; 57, 57') of which are perpendicular to one another.
4. Closure according to one or more of claims 1 to 3,
   characterized in that the closing head (20) has an axial mounting pin (24), which is fastened in a receiver (34) of the flap part (30) associated therewith,
   and that the mounting pin (24) is mounted radially elastically (35, 58) in the receiver.
5. Closure according to claim 4, characterized in that the mounting pin (24) is supported in a bush (36) made of elastomeric material (35)
   and that the bush (36) is fastened in the receiver (34) of the flap part (30).
6. Closure according to one or more of claims 1 to 5, characterized in that the closing head (20) is fastened by means of an axial screw connection (44, 37) to the flap part (30) associated therewith
   and that the lock (10) seated on the other flap part (40) has a through-opening (77) for a rotational tool (50) in order - in the coupled state of the closing head (20) - to enable axial adjustment of the mounting position (42) of the closing head (20) in the flap part (30).
7. Closure according to claim 6, characterized in that the through-opening (77) in the lock (10) penetrates not only the lock housing (19) but also all further lock members, such as the sensing member (12),
   which are positioned in the path of the rotational tool (50) towards the coupled closing head (20).
8. Closure according to claim 6 or 7, characterized in that disposed on the front end faces (25) of the closing head (20), on the one hand, and of the rotational tool (50), on the other hand, are the two mutually complementary halves (29, 59) of a plug-in connection,
   which in the plugged-in state transmit to the closing head (20) a torque, which is exerted on the rotational tool (50),
   and that the plug-in connection half (29) on the closing head (20) is axially aligned with the through-opening (77) in the housing (19).
9. Closure according to one or more of claims 1 to 8, characterized in that the closing head (20) tapers conically towards the front end face (25)
   and that the sensing member (12) has an opening (73), into which the closing head (20) engages with a partial height (75) in the coupling situation.
10. Closure according to claim 9, characterized in that the opening takes the form of an oblong hole (73), the large hole axis (74) of which lies in the plane of the swivelling motion (31) of the movable flap part (30).
11. Closure according to one or more of claims 1 to 10, characterized in that the lock housing (10) has an axial, preferably tubular guide receiver (45) for a cylindrical portion (23) of the closing head (20).
12. Closure according to claim 11, characterized in that, for centring the closing head (20) during introduction into the lock-side guide receiver (45), the cylindrical portion has lead-in slopes (28) directed in the axial direction of motion (32) of the closing head (20).

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