LOCK DEVICE FOR A WASTE RECEIVING DEVICE AND WASTE RECEIVING DEVICE WITH SUCH A LOCK DEVICE

Abstract

Disclosed is a lock device for a waste receiving device including a container and a cover held on the container and a waste receiving device having such a lock device. The lock device includes an upper lock part to be fastened on the cover side and a lower lock part to be fastened on the container side. The upper lock part has an upper lock part housing, a locking mechanism and a first locking element. The lower lock part has a lower lock part housing and a second locking element. The second locking element is pivotable about a swivel axis between a blocking position and a release position. In its blocking position, the second locking element cooperates with the first locking element in such a way that the cover is blocked.

Claims

1. Lock device (1) for a waste receiving device (2), which comprises a container (3) defining on an upper side a container opening enclosed by a container lip (4) and a cover (5) held on the container (3), said cover (5) being pivotably movable about a cover swivel axis (6) between a closed position closing the container opening and an open position uncovering the container opening, said lock device (1) comprising an upper lock part (7) to be fastened on the cover side with an upper lock part housing (8), a locking mechanism (9) received in the upper lock part housing (8) and a first locking element (11) projecting downwards from the upper lock part housing (8) and being pivotable about a swivel axis (10) between a locking position and an unlocking position by actuating the locking mechanism (9); and a lower lock part (25) to be fastened on the container side with a lower lock part housing (26), a second locking element (30) projecting upwards from the lower lock part housing (26) and being pivotable about a swivel axis (29) between a blocking position and a release position, wherein said second locking element (30) cooperates in the blocking position with the first locking element (11) being in the locking position in such a way that the cover (5) is locked, a weight part (37) operatively connected to the second locking element (30), said weight part (37) being pivotably received in the lower lock part housing (26) to position the second locking element (30) in the blocking position, when the container (3) is in the upright position, and is automatically transferred into the release position, in which the second locking element (30) is brought out of engagement with the first locking element (11) positioned in the locking position, when the container (3) is tilted forward for emptying, and a first arresting means (46) being movably received in the lower lock part housing (26), said first arresting means (46) arresting the second locking element (30) in the blocking position, when the container (3) is in the upright position, wherein at least one second arresting means (40) is received movably in the lower lock part housing (26) and is arranged and formed to arrest the second locking element (30) in the blocking position, when the container (3) is tilted laterally from the upright position.

2. The lock device (1) according to claim 1, wherein the upper lock part housing (8) and the lower lock part housing (26) define insert chamfers (24, 27) which engage each other when the cover (5) is moved in the closed position and align the first locking element (11) and the second locking element (30) with each other.

3. The lock device (1) according to claim 1, wherein the upper lock part housing (8) is composed of an outer housing element (8a) projecting outwardly from the cover (5) and an inner housing element (8b) projecting inwardly from the cover (5), the locking mechanism (9) being arranged on the outer housing element (8a) and the first locking element (11) together with the swivel axis (10) being arranged on the inner housing element (8b).

4. The lock device (1) according to claim 3, wherein a bar (15) being pivotable about a swivel axis by actuation of the locking mechanism (9) is provided in the outer housing element (8a), said bar (15) cooperating with an actuating section (11a) of the first locking element (11) arranged on the inner housing element (8b), which actuating section (11a) projects upwards into the outer housing element (8a).

5. The lock device (1) according to claim 1, wherein the first arresting means (46) is provided in the form of a ball which is movable upwards and downwards guided in a guide (45) within the lower lock part housing (27) between an upper position and a lower position and which blocks the pivoting movement of the weight part (37) in the lower position and releases the weight part (37) in the upper position.

6. The lock device (1) according to claim 5, wherein the guide surface of the guide (45) of the first arresting means (46) is provided at a rear side with an obstacle (45a) which is formed to make it more difficult for the first arresting means (46) to move from the lower position into the upper position, when the container (3) is tilted backwards from the upright position to a lying position.

7. The lock device (1) according to claim 1, wherein the second arresting means (44) is provided in the form of a ball movably guided within the lower lock part housing (26) in a substantially T-shaped guide (43), which has a substantially upright extending guide section (43a) and two guide sections (43b) branching off to both sides thereof at the lower end and extending substantially laterally, the ball releasing the pivoting movement of the weight part (37) only when positioned at the upper end of the substantially upright extending guide section (43a).

8. The lock device (1) according to claim 7, wherein the substantially laterally extending guide sections (43b) are bent upwards in an anchor-like manner.

9. The lock device (1) according to claim 7, wherein two second arresting means (44) in the form of balls guided in the T-shaped guide (45) are provided.

10. The lock device (1) according to claim 1, wherein the first locking element (11) is pretensioned via a spring element (18) in the direction of the locking position in such a way that the transfer of the first locking element (11) from the locking position into the unlocking position is effected by actuating the locking mechanism (9) against the spring force of the spring element (18).

11. The lock device (1) according to claim 10, wherein a third arresting means (22) is movably received in the upper lock part housing (8), in particular in the inner housing element (8b), said third arresting means (22) being arranged and designed to arrest the first locking element (11) in the locking position, when the container (3) is tilted laterally from the upright position into a lying position.

12. The lock device (1) according to claim 11, wherein the third arresting means (22) is provided in the form of a ball which is movably guided in the upper lock part housing (8), in particular inside the inner housing element (8b), in a laterally extending guide (23) between a lower position and an upper position, and which arrests, when in the upper position, the first locking element (11) in the locking position, the ball in particular cooperating with the weight part (37).

13. Waste receiving device (2) comprising a container (3) having on an upper side thereof a container opening enclosed by a container lip (4), a cover (5) held on the container (3), said cover (5) being movable between a closed position covering the container opening and an open position uncovering the container opening pivoting about a cover swivel axis (6) which extends along a container rear side, and a lock device (1) according to claim 1.

14. The lock device (1) according to claim 2, wherein the first arresting means (46) is provided in the form of a ball which is movable upwards and downwards guided in a guide (45) within the lower lock part housing (27) between an upper position and a lower position and which blocks the pivoting movement of the weight part (37) in the lower position and releases the weight part (37) in the upper position.

15. The lock device (1) according to claim 3, wherein the first arresting means (46) is provided in the form of a ball which is movable upwards and downwards guided in a guide (45) within the lower lock part housing (27) between an upper position and a lower position and which blocks the pivoting movement of the weight part (37) in the lower position and releases the weight part (37) in the upper position.

16. The lock device (1) according to claim 4, wherein the first arresting means (46) is provided in the form of a ball which is movable upwards and downwards guided in a guide (45) within the lower lock part housing (27) between an upper position and a lower position and which blocks the pivoting movement of the weight part (37) in the lower position and releases the weight part (37) in the upper position.

17. The lock device (1) according to claim 5, wherein the first arresting means (46) is provided in the form of a ball which is movable upwards and downwards guided in a guide (45) within the lower lock part housing (27) between an upper position and a lower position and which blocks the pivoting movement of the weight part (37) in the lower position and releases the weight part (37) in the upper position.

18. The lock device (1) according to claim 2, wherein the second arresting means (44) is provided in the form of a ball movably guided within the lower lock part housing (26) in a substantially T-shaped guide (43), which has a substantially upright extending guide section (43a) and two guide sections (43b) branching off to both sides thereof at the lower end and extending substantially laterally, the ball releasing the pivoting movement of the weight part (37) only when positioned at the upper end of the substantially upright extending guide section (43a).

19. The lock device (1) according to claim 3, wherein the second arresting means (44) is provided in the form of a ball movably guided within the lower lock part housing (26) in a substantially T-shaped guide (43), which has a substantially upright extending guide section (43a) and two guide sections (43b) branching off to both sides thereof at the lower end and extending substantially laterally, the ball releasing the pivoting movement of the weight part (37) only when positioned at the upper end of the substantially upright extending guide section (43a).

20. The lock device (1) according to claim 4, wherein the second arresting means (44) is provided in the form of a ball movably guided within the lower lock part housing (26) in a substantially T-shaped guide (43), which has a substantially upright extending guide section (43a) and two guide sections (43b) branching off to both sides thereof at the lower end and extending substantially laterally, the ball releasing the pivoting movement of the weight part (37) only when positioned at the upper end of the substantially upright extending guide section (43a).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Further features and advantages of the present invention are illustrated by the following description of a waste collection device according to an embodiment of the present invention with reference to the enclosed drawing. In it shows:

[0019] FIG. 1 a front view of a lock device according to an embodiment of the present invention;

[0020] FIG. 2 rear view of the device shown in FIG. 1;

[0021] FIG. 3 a perspective front view of an outer housing part of an upper lock part housing of an upper housing part of the lock device;

[0022] FIG. 4 a perspective bottom view of the outer housing part shown in FIG. 3;

[0023] FIG. 5 a perspective front top view of an inner housing part of an upper lock part housing of an upper lock part of the lock device with a first bar element in a locking position;

[0024] FIG. 6 a perspective side plan view of the inner housing part;

[0025] FIG. 7 a front view of the inner housing part;

[0026] FIG. 8 a sectional view along the line VIII-VIII in FIG. 6;

[0027] FIG. 9 a front view of the inner housing part with a first locking element in an unlocked position;

[0028] FIG. 10 a sectional view similar to FIG. 8 with the first locking element in its unlocking position;

[0029] FIG. 11 a sectional view similar to FIG. 8 after the arrangement shown in FIG. 8 has been tilted laterally to the left;

[0030] FIG. 12 a perspective rear exploded view of a lower lock part of the lock device;

[0031] FIG. 13 a front exploded view of the lower lock part housing;

[0032] FIG. 14 a rear view of the lower lock part housing with a second locking element in a blocking position;

[0033] FIG. 15 a sectional view of the lower lock part housing as viewed from the front with the front half of the housing removed and the second locking element in its blocking position;

[0034] FIG. 16 a sectional view along line XVI-XVI in FIG. 15;

[0035] FIG. 17 a perspective front view of the lower lock part housing with a front half of the housing removed and the second locking element in its blocking position;

[0036] FIG. 18 a view similar to FIG. 15 with the second locking element in its release position;

[0037] FIG. 19 a perspective view of the arrangement shown in FIG. 18;

[0038] FIG. 20 a partial perspective view of a waste receiving device with a lock device attached thereto, the cover of the waste receiving device being in its closed position;

[0039] FIG. 21 a perspective view showing the waste receiving device with a cover in its open position; and

[0040] FIG. 22 a rear view of the front container wall to which the lower lock part is attached.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] FIGS. 1 to 19 show a lock device 1 according to an embodiment of the present invention or components thereof. The lock device 1 is intended to be mounted, as shown in FIGS. 20 to 22, on a waste receiving device 2 comprising a container 3 defining at its upper side a container opening enclosed by a container lip 4 and a cover 5 held on the container 3, said cover 5 able to be moved between a closed position closing the container opening and an open position uncovering the container opening by pivoting about a cover swivel axis 6 which extends along a container rear side. The lock device 1 serves to lock the cover 5 in its closed position.

[0042] The lock device 1 comprises an upper lock part 7 to be fastened to the cover 5 of the container 3 of the waste receiving device 2, said upper lock part 7 comprising as main components an upper lock part housing 8, a locking mechanism 9 accommodated in the upper lock part housing 8 and a first locking element 11 projecting downwards from the upper lock part housing 8 and pivotable about a swivel axis 10 between a locking position and an unlocking position by actuating the locking mechanism. The upper lock part housing 8 is composed of an outer housing element 8a and an inner housing element 8b. When the lock device is attached to the waste receiving device 2, the outer housing element 8a projects outwards and the inner housing element 8b projects inwards from the cover 5 of the waste receiving device 2. The housing parts 8a and 8b are connected via screw-on mandrels 12 projecting downwards from the outer housing element 8a, said screw-on mandrels 12 engage from above in associated mandrel receptacles 13 of the inner housing element 8b. The outer housing element 8a accommodates the locking mechanism 9 which can be operated with a key 14. At the inner end of the locking mechanism 9, a bar 15 is mounted so as to be rotatable about a swivel axis 16 defined by the locking mechanism 9, said swivel axis 16 in this case extending parallel to the swivel axis 10 of the first locking element 11, see for example FIG. 5. The bar 15 interacts with an actuating section 11a, which extends upwards from the inner housing part 8b into the outer housing part 8a, of the first locking element 11 positioned on the inner housing element 8b. When the key 14 shown in FIG. 1 is turned to the left, the bar 15, viewing FIG. 5 from the left, presses against the actuating section 11a of the first locking element 11, causing the first locking element 11 to pivot in the direction of the arrow 17 to the right from the locking position of the first locking element 11 shown in FIGS. 5 to 8 about the swivel axis 10 to its unlocking position shown in FIGS. 9 and 10. This pivoting movement takes place in the present case against the spring force of a spring element 18 in the form of a latch spring which presses the first locking element 11 into its locking position. For this purpose, the spring element 18, which in this case is formed with two spring legs projecting to opposite sides, is supported by one spring leg on the upper side of a supporting wall 19 of the inner housing element 8b and by the other spring leg on the upper side of a supporting section 11b of the first locking element 11 extending parallel to the swivel axis 10, which support section 11b extends in a horizontal plane in the locking position of the first locking element 11 and connects the first locking element 11 with its actuating section 11a. The free end of the first locking element 11, which projects downwards from the inner housing element 8b at the front side, is hook-shaped and defines an engagement opening 20 at its side facing in the direction of its locking position. At the bottom side, the free end of the first locking element 11 is provided with a contact surface 21, which is inclined obliquely upwards and whose function is explained in more detail below. The inner housing element also movably accommodates an arresting means 22, which is arranged and designed in such a way that it blocks the first locking element 11 in the locking position when the container 3 shown in FIGS. 20 to 22 is tilted from the upright position in the locking pivot direction, i.e. in the opposite direction to the arrow shown in FIG. 5, to a lying position. 15s In the present case, the arresting means 22 is provided in the form of a ball which is guided inside the inner housing element 8b in a laterally extending guide 23 inclined downwards towards the outside of the inner housing element 8b and movable between a lower position and an upper position. The arresting means 22 interacts with a blocking section 11c of the first locking element 11 which blocking section 11c extends substantially parallel to the guide 23 above the latter, but is shorter than the guide 23. When the container 3 of the waste receiving device 2 is in its upright position, the arresting means 22 remains in the lower position defined by the guide 23 as shown in FIG. 8. When the container 3 is tilted to the left from the position shown in FIG. 8, the arresting means 22 also rolls along the guide 23 to the left and slides under the blocking section 11c of the first locking element 11 as shown in FIG. 9. In this position, the arresting means 22 blocks the first locking element 11 in the locking position, as it prevents the first locking element from pivoting towards its unlocking position. An emergency unlocking section 11d of the locking element 11 projects downwards from the inner housing element 8b of the upper lock part housing 8. If this emergency unlocking section 11d is pressed, this leads to an unlocking of the cover 5. For example, a person trapped in container 3 can free himself by pressing the emergency unlocking section 11d. In the lower area of the inner housing element 8b, two lateral insert chamfers 24 are formed on the outside of the housing, which are inclined to each other in a V-shape.

[0043] The lock device further comprises a lower lock part 25 cooperating with the upper lock part 7, said lower lock part 25, as shown in FIG. 21, being fixed in the upper part of the inner side of the front wall of container 3. The lower lock part 25 comprises a lower lock part housing 26 which is composed of a front housing element 26a and a rear housing element 26b, as best illustrated in FIGS. 12 and 13. In the upper part of the lower lock part housing 26, there is a deepening 28 which is open at the top and is bounded laterally by insert chamfers 27, which slope towards each other in a V-shape. The insert chamfers 27 of the lower lock part housing 26 correspond to the insert chamfers 24 of the inner housing element 8b of the upper lock part housing 8, so that the upper lock part housing 8 is automatically aligned with the lower lock part housing 26 when the cover 5 of the container is closed, when the upper lock part 7 is inserted into the lower lock part 25 from above. The lower lock part 25 comprises a second locking element 30 projecting upwardly from the lower lock part housing 26 into the deepening 28, said second locking element being pivotably movable about a swivel axis 29 between a blocking position shown in FIGS. 14 to 17 and a release position shown in FIGS. 18 and 19, and engageable in the blocking position with a first locking element 11 by moving the latter from its unlocking position to its locking position in the closed condition of the cover 5 in order to block the cover 5. The second locking element 30 is formed in the present case by a substantially U-shaped holder 31, which receives in the upper section a pin 32 extending parallel to the swivel axis 10 of the first locking element 11, wherein a sleeve 33 is fitted to the pin 32. The holder 31 is connected via a web 34 to a swivel part 35 which is designed and pivotably accommodated in the lower lock part housing 26 in such a way that it positions the second locking element 30 in an upright position of the container 3 of the waste receiving device 2 in the blocking position, in which it can be engaged with a first locking element 11, and, when the container 3 is tilted forward to empty it, is transferred to the release position shown in FIGS. 18 and 19 in which it is disengaged from the first locking element in its locking position. The second locking element 30 and the swivel part 35 are made in one piece of plastic. Alternatively, they can also be joined together as individual components. The web 34, which connects the second locking element 30 with a swivel part 35, is surrounded by a flexible gaiter 36 in order to counteract contamination of the interior of the lower lock part housing 26. The pivoting movement of the swivel part 35 about the swivel axis 29 is brought about by a weight part 37 which is made of metal and is held rotatably about a swivel axis 38 on the front housing element 26a of the lower lock part housing 26. The swivel part 35 is engaged with this weight part 37 via a recess 39 which engages on a projection 40 projecting from the weight part 37. A guiding pin 41 of the swivel part 35, which is arranged opposite the recess 39 and protrudes towards the weight part 37, engages from the bottom into an indentation 42 formed at the lower side of the weight part 37 in the blocking position of the second locking element 30, from which indentation 42 it is guided out in the release position. The weight part 37 defines at its front side a rear part of a substantially T-shaped guide 43 with a substantially upright extending guide section 43a defining a circular section around the swivel axis 38 of the weight part 37 and two anchor-like upwardly bent guide sections 43b branching off from this at the lower end on both sides, said guide sections 43b extending substantially laterally. The associated front counterpart of guide 43 is formed on the rear side of the front housing element 26a of the lower lock part housing 26. Within the guide 43, two arresting means 44 in the form of balls are movably guided, said balls only releasing the pivoting movement of the weight part 37 and, thus, the second locking element 30 when they are positioned by gravity at the upper end of the substantially upright extending guide section 43a. This is only the case, when the container 3, starting from its upright position, is tilted straight forward or backward beyond its horizontal position. As soon as the tilting movement experiences a lateral component, the arresting means 44 also move under gravity into one of the guide sections 43b and block the pivoting movement of the weight part. In principle, it is possible to provide only one arresting means 44. However, two arresting means 44 are preferred, as they prevent each other from uncontrolled movements. A further guide 45 is formed at an upper edge area of the lower lock part housing 26. This guide 45, which accommodates a further arresting means 46 in the form of a ball, extends vertically, so that the arresting means 46 can be moved upwards and downwards within the guide 45 between an upper position and a lower position. In its lower position, which the arresting means 46 occupies by gravity in the upright position of the container 3, it engages a blocking shoulder 37a projecting upwards from the weight part 37, said blocking shoulder 37a preventing the weight part 37 and thus the second locking element 30 from pivoting into the release position of the second locking element 30. The blocking shoulder 37a of the weight part 37 ends below the upper position, so that the weight part 37, when the arresting means 46 reaches its upper position under the force of gravity when the container 3 is tilted forward beyond its horizontal position, can pivot about its swivel axis 38. Within the scope of this pivoting movement, it takes the swivel part 35 with it so that the second locking element 30 pivots about its associated swivel axis 29 to the release position. During this pivoting movement of the swivel part 35, its guiding pin 41 is transferred from the first indentation 42 to the second indentation 43 of the weight part 37. The guide surface of the guide 45 is provided at the rear between the lower position and the upper position of the arresting means 46 with an obstacle 45a, here in the form of a rib projecting forward, which prevents or at least makes it more difficult for the first arresting means 46 to move from the lower position to the upper position when the container is tilted backwards from the upright position. The weight part 37 further defines an upwardly protruding stop 37b which limits the pivoting movement and which strikes against the inside of the lower lock part housing 26. The housing elements 26a and 26b of the lower lock part housing 26 are screwed together using fixing screws 47. For fastening to the container 3, the lower lock part housing 26 is pressed on the front side against a gasket 48 adapted to the shape of the corresponding container wall to which the lower lock part housing 26 is to be fastened and then screwed together with the container 3 using further fixing screws 47. For this purpose, the housing elements 26a and 26b of the lower lock part housing 26 are provided with corresponding bushing receptacles 49. These bushing receptacles 49 are aligned with corresponding (not shown) holes provided on container 3. Bushings 51 connected to each other from the outside via a bushing part 50 are then pushed through the holes and the bushing receptacles 49, into which bushings 50 the fixing screws 47 are then screwed from behind. In this way, the lower lock part 25 can be securely fastened to the container 3 in such a way that it is inaccessible from the outside, as shown in FIG. 22.

[0044] FIGS. 20 to 22 show the lock device 1 in the condition in which it is attached to a waste receiving device 2 to lock the cover 5 to the container 3. This is to prevent unauthorized third parties from filling container 3 or removing things from container 3. The outer housing element 8a of the lower lock 1s part housing 8 is placed on the container 5 from above and screwed to the inner housing element 8b of the upper lock part housing 8, which is placed on the cover 5 from below. The lower lock part housing 26 is attached from the inside to the front wall of container 3 in the manner described above in such a way that the first locking element 11 can be engaged with a second locking element 30 when the cover 5 is closed. The V-shaped insert chamfers 24 and 27 provided on the upper lock part housing 8 and on the lower lock part housing 26 ensure that the upper lock part housing 8 and the lower lock part housing 26 are properly aligned and engaged with each other when the cover 5 is closed. As soon as the first locking element 11 is positioned from above on the sleeve 33 of the second locking element 30 surrounding the pin 32, the first locking element 11, due to its contact surface 21 provided at the lower end, is moved by the exerted pressure to the left into its unlocking position so that it can pass the pin 32 or the sleeve 33. Locking element 11 is moved back into its locking position by the spring force of the spring element 18 so that its engagement opening 20 engages on the pin 32 or the sleeve 33 of the second locking element 30. In order to be able to lift the cover 5 from this position back of the container 3, the locking mechanism 9 must be actuated by the key 14 to move the first locking element 11 into its unlocking position.

[0045] When, in a blocked state of the cover 5, the container 3 is tilted for emptying to from its upright position forward beyond the horizontal position, the arresting means 46 automatically moves from its lower position to its upper position. The same applies to the arresting means 44 guided in a the substantially T-shaped guide 43, which move from the lower position along the substantially upright extending guide section 43a to a position at the upper end of the substantially upright extending guide section 43a. In this state, the pivoting movement of the weight part 37, which is initiated by gravity, is released so that the second locking element 30 is transferred from its blocking position to the release position via the weight part 37. Correspondingly, the second locking element 30 comes out of engagement with a first locking element 11 positioned in its locking position so that cover 5 opens automatically.

[0046] If the container 3 is tilted by an external force having a lateral component, the arresting means 44 move within the substantially T-shaped guide 43 along the guide sections 43b of the guide extending substantially laterally whereby a pivoting movement of the weight part 37, which is also initiated here by gravity, is prevented. Accordingly, the second locking element 30 remains in engagement with a first locking element 11 positioned in its locking position, so that cover 5 does not open. Should, in the course of such a laterally tilting of the container 3, the spring element 18, which holds the first locking element 11 in its locking position, be overstressed and collapse, whereby it would be basically be possible to move the first locking element 11 into its unlocking position, this transfer to the unlocking position is prevented by the arresting means 22 guided in the guide 23 provided on the inner housing element 8b of the upper lock part housing 8, which moves to the left from the position shown in FIG. 8 to the position shown in FIG. 11, where it blocks any pivoting movement of the first locking element 11.

[0047] When the container 3 is tilted backwards from the upright position, the arresting means 46 guided in the guide 45 of the lower lock part 25 will move from the lower position towards the upper position. In doing so, it strikes against the obstacle 45a formed on the rear guide surface of the guide 45 and is correspondingly prevented from reaching the upper position, in which it releases the movement of the weight part 37 and the second locking element 30 into the release position. Accordingly, cover 5 will not open here either.

[0048] It should be clear that the embodiment described above is only an example and in no way restrictive. Rather, modifications and alterations are possible without leaving the scope of protection of the present application as defined in the enclosed claims.

TABLE-US-00001 Reference character list 1 Lock device 2 Waste receiving device 3 Container 4 Container lip 5 Cover 6 Cover swivel axis 7 Upper lock part 8 Upper lock part housing 8a Outer housing element 8b Inner housing element 9 Locking mechanism 10 Swivel axis 11 First locking element 11a Actuating section 11b Supporting section 11c Blocking section 11d Emergency unlocking section 12 Screw-on mandrel 13 Mandrel receptacle 14 Key 15 Bar 16 Swivel axis 17 Arrow 18 Spring element 19 Supporting wall 20 Engagement opening 21 Contact surface 22 Arresting means 23 Guide 24 Insert chamfer 25 Lower lock part 26 Lower lock part housing 26a Front housing element 26b Rear housing element 27 Insert chamfer 28 Deepening 29 Swivel axis 30 Second locking element 31 Holder 32 Pin 33 Sleeve 34 Web 35 Swivel part 36 Gaiter 37 Weight part 37a Blocking shoulder 37b Stop 38 Swivel axis 39 Recess 40 Projection 41 Guiding pin 42 Indentation 43 Guide 43a Guide section 43b Guide section 44 Arresting means 45 Guide 45a Obstacle 46 Arresting means 47 Fixing screw 48 Gasket 49 Bushing receptacle 50 Bushing part 51 Bushing