CLOSURE ARRANGEMENT FOR CLOSING A FUEL INLET COMPARTMENT OF A BODY OF A MOTOR VEHICLE

Abstract

A closure arrangement for closing a fuel inlet compartment of a motor vehicle body, including a guide device fixed to the vehicle, a cover element displaceably guided on the guide device between a closed position in which the fuel inlet compartment is closed and an open position in which the fuel inlet compartment is open. The guided displacement of the cover element between the closed and open positions includes reciprocating movement and longitudinal movements. The closure arrangement has a drive device operatively connected to the cover element and drives same between the closed and open positions. The drive device has a drive rod element acting axially indirectly on the cover element so as to transmit pulling and pushing forces. The cover element is displaceable between the closed and the open positions by an axial drive movement of the drive rod element with reciprocating and longitudinal movement.

Claims

1. A closure arrangement for closing a fuel inlet compartment of a body of a motor vehicle, comprising a guide device which—in a ready-for-use mounted state—is fixed to the vehicle, a cover element which is displaceably guided on the guide device between a closed position in which the cover element closes the fuel inlet compartment and an open position in which the cover element opens up the fuel inlet compartment, wherein the guided displacement of the cover element between the closed position and the open position comprises a reciprocating movement in a reciprocating direction and a longitudinal movement in a longitudinal direction, and comprising a drive device which is operatively connected to the cover element, the cover element being displaceable thereby so as to be driven between the closed position and the open position, wherein the drive device has a drive rod element which acts in the axial direction thereof at least indirectly on the cover element so as to transmit a pulling and pushing force, wherein the cover element is displaceable between the closed position and the open position by an axial drive movement of the drive rod element with reciprocating and longitudinal movement.

2. The closure arrangement according to claim 1, wherein the drive rod element is operatively connected to the cover element, in a pivotably movable manner relative to the cover element, by an articulated arrangement about a pivot axis oriented perpendicularly to the axial direction.

3. The closure arrangement according to claim 1, wherein the cover element is mounted on the guide device by a bearing device which cooperates with the guide device with sliding and/or rolling movement, wherein the cover element is connected to the bearing device in an immovable manner relative to the bearing device and wherein the drive rod element acts on the bearing device.

4. The closure arrangement according to claim 2, wherein the articulated arrangement has a first articulated portion which is arranged on the bearing device and a second articulated portion which is arranged at the front end side on the drive rod element, said articulated portions cooperating with pivoting movement about the pivot axis.

5. The closure arrangement according to claim 3, wherein the bearing device has a plurality of guide elements which are extended parallel to the pivot axis and/or perpendicularly to the axial direction of the drive rod element and which are supported on one respective guide track of the guide device with sliding movement.

6. The closure arrangement according to claim 3, wherein the bearing device is designed in the form of a bearing frame which has at least two longitudinal frame elements which are longitudinally extended in the axial direction of the drive rod element and which are connected together by at least one transverse frame element longitudinally extended transversely to the axial direction.

7. The closure arrangement according to claim 6, wherein the bearing frame and the cover element are configured as a component joined as a single piece.

8. The closure arrangement according to claim 1, wherein the drive rod element is a toothed rod which meshes with a drive gear of the drive device, wherein the drive gear—in a ready-for-use mounted state—is rotatably mounted about a rotational axis in a manner fixed to the vehicle and is driven by a drive motor.

9. A closure arrangement for closing a fuel inlet compartment of a body of a motor vehicle, comprising a guide device which—in a ready-for-use mounted state—is fixed to the vehicle, a cover element which is displaceably guided on the guide device between a closed position in which the cover element closes the fuel inlet compartment and an open position in which the cover element opens up the fuel inlet compartment, wherein the guided displacement of the cover element between the closed position and the open position comprises a reciprocating movement in a reciprocating direction and a longitudinal movement in a longitudinal direction, and comprising a drive device which is operatively connected to the cover element, the cover element being displaceable thereby so as to be driven between the closed position and the open position, wherein the drive device has a drive gear which—in the ready-for-use mounted state—is rotatably mounted in a manner fixed to the vehicle, and has a toothed rod element which meshes with the drive gear and which is connected to the cover element in an immovable manner relative to the cover element and is guided together therewith with reciprocating and longitudinal movement, wherein the toothed rod element has a first toothed portion which is longitudinally extended in the reciprocating direction and which cooperates with the drive gear during the reciprocating movement, and a second toothed portion which is longitudinally extended in the longitudinal direction and which cooperates with the drive gear during the longitudinal movement.

10. The closure arrangement according to claim 9, wherein the toothed rod element has a third toothed portion which forms a longitudinally curved transition between the first toothed portion and the second toothed portion.

11. The closure arrangement according to claim 9, wherein the cover element and the toothed rod element are arranged on a bearing device which cooperates with the guide device with sliding and/or rolling movement.

12. The closure arrangement according to claim 11, wherein the bearing device has a plurality of guide elements which protrude laterally from the toothed rod element and which are supported on one respective guide track of the guide device with sliding movement.

13. The closure arrangement according to claim 11, wherein the bearing device is designed in the form of a bearing frame which has two longitudinal frame elements which are longitudinally extended in an axial direction of the toothed rod element and which are connected together by at least one transverse frame element which is longitudinally extended transversely to the axial direction, wherein the toothed rod element is configured on one of the longitudinal frame elements.

14. The closure arrangement according to claim 11, wherein the cover element has a flange portion which is arranged on the lower face and which is screwed to a mating flange portion arranged on the upper face on the bearing device, wherein an adjusting element is provided, said adjusting element being arranged between the flange portion and the mating flange portion and being deformable in a rubber-elastic manner for adjusting a relative alignment of the cover element relative to the bearing device by the screw connection.

15. The closure arrangement according the claim 7, wherein the component is constructed of plastics.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 shows in a cut-away perspective view an electrically driven motor vehicle with an embodiment of a closure arrangement according to the invention which is provided for closing a charging socket compartment of the body of the motor vehicle,

[0022] FIG. 2 shows in enlarged detailed view the region of the charging socket compartment according to FIG. 1, wherein a cover element of the closure arrangement adopts an open position,

[0023] FIG. 3 shows in a schematic perspective view the closure arrangement according to FIGS. 1 and 2 together with a charging socket assigned to the charging socket compartment,

[0024] FIG. 4 shows the closure arrangement according to FIGS. 1 to 3 together with the charging socket in a further schematic perspective view,

[0025] FIG. 5 shows the closure arrangement according to FIGS. 1 to 4 in a view corresponding to FIG. 4, wherein the cover element adopts a closed position,

[0026] FIG. 6 shows the cover element together with a bearing frame in a perspective view corresponding to FIG. 5,

[0027] FIG. 7 shows in a perspective exploded view a further embodiment of a closure arrangement according to the invention with individual components and/or portions omitted for illustrative reasons, wherein a cover element, a bearing device and a toothed rod element of the closure arrangement are shown,

[0028] FIG. 8 shows the components, visible with reference to FIG. 7, of the closure arrangement in a lateral viewing direction and

[0029] FIG. 9 shows the components, visible with reference to FIGS. 7 and 8, in an exploded view in a lateral viewing direction.

DETAILED DESCRIPTION

[0030] According to FIG. 1 a motor vehicle F is provided with a closure arrangement 1. The closure arrangement 1 serves for an openable closure of a fuel inlet compartment T which in the exemplary embodiment shown is arranged in a left-hand, front-side region of the body K of the motor vehicle F.

[0031] In the present case, the motor vehicle F is an electrically driven passenger motor vehicle. The fuel inlet compartment T thus may also be denoted as the charging socket compartment. In a manner known in principle, an electrical charging socket L (FIGS. 3, 4) is arranged in the region of the fuel inlet compartment and/or charging socket compartment T. This electrical charging socket is provided for the electrical charging of a traction battery of the electrically driven passenger motor vehicle.

[0032] The closure arrangement 1 has a cover element 2 which may also be denoted as a filler cap or charging socket cap. The cover element 2 is displaceably guided between a closed position (FIGS. 1, 5) and an open position (FIGS. 2, 3, 4). For guiding the displacement movement of the cover element 2 between the closed position and the open position the closure arrangement 1 has a guide device 3. This guide device is arranged fixed to the vehicle in the ready-for-use mounted state, shown with reference to FIGS. 1 and 2, and to this end, in a manner known in principle, joined in the region of the charging socket compartment T to portions of the body K provided therefor. In the closed position, the cover element 2 closes the charging socket compartment T. In this case, the cover element 2 is oriented flush with the surface of the body portions of the body K surrounding the charging socket compartment T. In the open position, the cover element 2 opens up the charging socket compartment T. As a result, the charging socket L is freely accessible. Accordingly, in the open position a charging cable with a corresponding charging plug may be attached to the charging socket L.

[0033] The displacement of the cover element 2 which is guided on the guide device 3 between the closed and open position comprises a reciprocating movement in a reciprocating direction HR and a longitudinal movement in a longitudinal direction LR. The reciprocating direction HR and the longitudinal direction LR are oriented perpendicularly to one another. In the embodiment shown, the reciprocating direction HR is parallel to a vehicle transverse direction Y. The longitudinal direction LR is parallel to a vehicle vertical direction Z. In this case, the cover element 2—starting from the closed position (FIGS. 1, 5)—is displaced outwardly in the reciprocating direction HR with reciprocating movement and downwardly in the longitudinal direction LR with longitudinal movement. In other words, in the open position the cover element 2 is displaced outwardly in the vehicle transverse direction Y and downwardly in the vehicle vertical direction Z.

[0034] Depending on the local attachment of the charging socket compartment to the motor vehicle and/or the design of the guide device fixed to the vehicle, the reciprocating direction of the reciprocating movement of the cover element and the longitudinal direction of the longitudinal movement of the cover element may be oriented differently relative to the vehicle axes. For example, it is also possible for the cover element to be movable in a vehicle longitudinal direction X during a displacement between the closed and open position.

[0035] For the driven displacement of the cover element 2 the closure arrangement 1 has a drive device A which is operatively connected to the cover element 2. The drive device A has a drive rod element 4. The drive rod element 4 is operatively connected in the axial direction AR thereof so as to transmit a pulling and pushing force to the cover element 2. To this end, the drive rod element 4 acts at least indirectly on the cover element 2. The cover element 2 is movable with reciprocating and longitudinal movement between the closed and open position by means of an axial drive movement of the drive rod element 4.

[0036] In the embodiment shown, the drive rod element 4 is a toothed rod 5 which meshes with a drive gear 6 of the drive device A. The drive gear 6 is rotatably mounted about a rotational axis D and operatively connected in a torque-proof manner to a drive motor 7 of the drive device A. The drive motor 7 is connected to an electrical on-board network of the motor vehicle F for the supply of operating power, in a manner known in principle but not shown in more detail.

[0037] In an embodiment, not shown illustratively, the drive rod element 4 is configured in the form of a threaded rod. The threaded rod is screwed with threading movement to a rotatably mounted and motor-driven threaded nut of the drive device.

[0038] In the embodiment shown, the axial direction AR of the drive rod element 4—in a viewing direction oriented parallel to the reciprocating direction HR—is oriented parallel to the longitudinal direction LR. In other words, the drive rod element 4 in the embodiment shown is oriented approximately in the vehicle vertical direction Z. In a viewing direction oriented perpendicularly to the reciprocating direction HR and perpendicularly to the longitudinal direction LR, the axial direction AR of the drive rod element 4 is oriented approximately perpendicularly to the reciprocating direction HR.

[0039] The principal mode of operation of the closure arrangement 1 when opening and closing the cover element 2 is as follows:

[0040] For opening the cover element 2 the drive gear 6 is rotated by means of the drive motor 7 clockwise about the rotational axis D—relative to the drawing plane of FIG. 5. The toothed rod 5 which meshes with the drive gear 6 is moved thereby by the application of a pulling force in the axial direction AR thereof downwardly past the drive gear 6. The cover element 2, which is operatively connected to the toothed rod 5 in a manner to be described in more detail, is driven so as to be displaced in the direction of the open position by the application of a pulling force initially in the reciprocating direction HR with reciprocating movement and then in the longitudinal direction LR with longitudinal movement. In this case, the cover element 2 is guided, in a manner to be described in more detail, with reciprocating and longitudinal movement on the guide device 3 fixed to the vehicle. For the displacement of the cover element 2 into the closed position the drive gear 6 is rotated about the rotational axis D in the opposing direction by means of the drive motor 7. As a result, the toothed rod 5 which meshes with the drive gear 6 is moved by the application of a pushing force in the axial direction AR thereof upwardly past the drive gear 6. The cover element 2, starting from the open position, is displaced thereby initially upwardly with linear movement in the longitudinal direction LR and then inwardly with reciprocating movement in the reciprocating direction HR.

[0041] In the embodiment shown, the drive rod element 4 is operatively connected to the cover element 2 by means of an articulated arrangement 8 about a pivot axis S oriented perpendicularly to the axial direction AR, with pivoting movement relative to the cover element 2. The pivotably movable arrangement ensures, in particular, an angular compensation between the axial direction AR and the displacement direction of the cover element 2 which changes during the reciprocating and longitudinal movement. In the embodiment shown, the pivot axis S is oriented parallel to the rotational axis D.

[0042] The articulated arrangement 8 has a second articulated portion 10 which is arranged on the front end side on the drive rod element 4, and a first articulated portion 9 which is operatively connected fixedly to the cover element 2, in a manner to be described in more detail (FIG. 6). The first articulated portion 9 and the second articulated portion 10 form a hinged joint 9, 10 which is movable about the pivot axis S.

[0043] The closure arrangement 1 additionally has a bearing device 11 (FIG. 6). The cover element 2 is mounted with guided movement on the guide device 3 by means of the bearing device 11. To this end, the bearing device 11 is supported, in a manner to be described in more detail, with sliding and/or rolling movement on the guide device 3. Relative to the bearing device 11 the cover element 2 is joined thereto in an immovable manner. The drive rod element 4 acts on the bearing device 11 in order to transmit drive force to the cover element 2. In this case said articulated arrangement 8 is configured between the drive rod element 4 and the bearing device 11. In other words, the first articulated portion 9 is assigned to the bearing device 11 and to this end is configured on a front end region 12 of the bearing device 11 facing the drive rod element 4.

[0044] As is visible further in particular with reference to FIG. 6, the bearing device 11 has a plurality of guide elements 13, 14, 15, 16. The guide elements 13 to 16 are extended parallel to the pivot axis S and protrude in pairs laterally from the bearing device 11. The guide elements 13 to 16 may also be denoted as the first guide element 13, the second guide element 14, the third guide element 15 and the fourth guide element 16. The guide elements 13 to 16 are supported on one respective guide track 17 to 20 of the guide device 3 with sliding movement. The guide tracks 17 to 20 have in each case a reciprocating portion, not denoted further, and a longitudinal portion, not denoted further. The reciprocating portions are longitudinally extended in each case in the reciprocating direction HR and serve for guidance with reciprocating movement. The longitudinal portions are longitudinally extended in each case in the longitudinal direction LR and serve for guidance with longitudinal movement. The guide tracks 17 to 20 are configured on opposing side walls 21, 22 of the guide device 3. The guide tracks 17 to 20 may also be denoted as the first guide track 17, the second guide track 18, the third guide track 18 and the fourth guide track 20. The first guide element 13 is supported on the first guide track 17 with sliding movement. The second guide element 14 is supported on the second guide track 18 with sliding movement. The third guide element 15 is supported on the third guide track 19 with sliding movement. The fourth guide element 16 is supported on the fourth guide track 20 with sliding movement.

[0045] In the embodiment shown, the guide elements 13 to 16 are designed in each case as sliding elements in the form of a slide pin. The guide tracks 17 to 20 are accordingly designed in each case as a sliding track in the form of a sliding slot in which the corresponding slide pin engages in the axial direction thereof and is held in the radial direction.

[0046] The bearing device 11 in the embodiment shown is designed in the form of a bearing frame 23. The bearing frame 23 has two longitudinal frame elements 24, 25 which are spaced apart from one another in the transverse direction. The longitudinal frame elements 24, 25—in a viewing direction oriented parallel to the reciprocating direction HR—are longitudinally extended in any case in the region of the guide elements 13 to 16 parallel to the axial direction AR. The longitudinal frame elements 24, 25 in the embodiment shown are connected together by means of three transverse frame elements 26, 27, 28. The transverse frame elements 26, 27, 28 are oriented substantially in the transverse direction and longitudinally extended between the longitudinal frame elements 24, 25. The transverse frame element 26 may also be denoted as the first transverse frame element and is provided with the first articulated portion 9 of the articulated arrangement 8. The transverse frame element 27 may also be denoted as the second transverse frame element and functions primarily as a reinforcing element. The transverse frame element 28 may also be denoted as the third transverse frame element and forms a connecting element for attaching the cover element 2 to the bearing frame 23.

[0047] In the embodiment shown, the bearing frame 23 and the cover element 2 are produced from plastics as a component 2, 23 joined as a single piece. The guide elements 13 to 16 and the first articulated portion 9 form in each case a portion of the component 2, 23 joined as a single piece.

[0048] With reference to FIGS. 7 to 9 a further embodiment of a closure arrangement according to the invention 1a is shown, wherein individual components and/or portions are omitted for illustrative reasons. The closure arrangement 1a according to FIGS. 7 to 9 is in some cases identical regarding its design and its mode of operation to the closure arrangement 1 according to FIGS. 1 to 6. This applies, in particular, to the embodiment of the guide device, which for this reason is not shown in detail in the closure arrangement 1a. The closure arrangement 1a differs substantially from the closure arrangement 1 according to FIGS. 1 to 6 by the embodiment of its drive device A′.

[0049] The drive device A′ has a drive gear 6a which is mounted fixedly on the vehicle—in the ready-for-use mounted state—about a rotational axis D′. The drive gear 6a is shown merely schematically with reference to FIG. 8 and represented by a dashed line. The drive gear 6a, in a manner comparable with the drive gear 6, is operatively connected in a torque-proof manner to a drive motor of the closure arrangement 1a, not shown, and rotatable thereby about the rotational axis D′. The drive device A′ additionally has a toothed rod element 5a which meshes with the drive gear 6a. In contrast to the toothed rod 5 of the closure arrangement 1, relative to the cover element 2a the toothed rod element 5a is immovably connected thereto and together therewith guided with reciprocating and longitudinal movement on the guide device of the closure arrangement 1a. The guide device of the closure arrangement 1a, in a manner corresponding to the guide device 3, permits a displacement movement of the cover element 2a with reciprocating and longitudinal movement between a corresponding open and closed position. To this end, the guide device of the closure arrangement 1a has a plurality of guide tracks, only two guide tracks 19a, 20a thereof being indicated schematically with reference to FIG. 8.

[0050] The toothed rod element 5a has a first toothed portion Z1 and a second toothed portion Z2. The toothed portions Z1, Z2 are longitudinally extended in different directions and are angled-back relative to one another in this regard. The first toothed portion Z1 cooperates with the drive gear 6a during the reciprocating movement of the cover element 2a. The second toothed portion Z2 cooperates with the drive gear 6a during the longitudinal movement of the cover element 2a. The first toothed portion Z1 is longitudinally extended in the reciprocating direction, and the second toothed portion Z2 is longitudinally extended in the longitudinal direction, of the displacement movement of the cover element 2a. In other words, a toothing of the toothed rod element 5a formed by teeth 29a is longitudinally extended in different ways in some portions.

[0051] The toothed rod element 5a additionally has a third toothed portion Z3. This third toothed portion forms a longitudinally curved transition between the first toothed portion Z1 and the second toothed portion Z2. In this case, the toothing of the toothed rod element 5a is configured in the same shape, independently of the respective toothed portion Z1, Z2, Z3, i.e. configured with an identical shape of the respective teeth 29a. The only difference is the orientation thereof relative to the axial direction AR of the toothed rod element 5a. The toothed portions Z1 and Z2 have in each case a uniform toothing direction, not denoted further. However, a toothing direction of the third toothed portion Z3 is changeable and configured at one end of the third toothed portion Z3 identically with the toothing direction of the first toothed portion Z1 and at the other end identically with the toothing direction of the second toothed portion Z2.

[0052] In the embodiment shown, the cover element 2a and the toothed rod element 5a are arranged on a bearing device 11a. The bearing device 11a is guided on the guide device of the closure arrangement 1a with sliding movement. This is carried out in an identical manner to the bearing device 11 of the closure arrangement 1, or in any case in a very similar manner. Both the cover element 2a and the toothed rod element 5a are immovable relative to the bearing device 11a during the displacement movement. For guiding the displacement movement the bearing device 11a has a plurality of guide elements 15a, 16a protruding laterally from the toothed rod element 5a. The guide elements 15a, 16a are supported in each case on a guide track 19a and/or 20a of the guide device with sliding movement. The guide tracks 19a, 20a are shown in simplified form merely schematically with reference to FIG. 8. The guide element 15a may also be denoted as the first guide element. The guide element 16a may also be denoted as the second guide element. The same applies to the guide tracks 19a, 20a. The first guide track 19a has a reciprocating portion 191a and a longitudinal portion 192a. The same applies to the second guide track 20a which accordingly has a reciprocating portion 201a and a longitudinal portion 202a.

[0053] The guide elements 15a, 16a are designed in each case as a sliding element in the form of a slide pin. Accordingly, the guide tracks 19a, 20a are designed in each case as a sliding track in the form of a sliding slot. This corresponds to the embodiment according to FIGS. 1 to 6. It goes without saying that the bearing device 11a has further guide elements, not shown in more detail, which are arranged spaced apart from the guide elements 15a, 16a in the transverse direction and cooperate with corresponding guide tracks of the guide device with sliding movement. In this regard, the guidance of the bearing device 11a is carried out in principle according to the guidance of the bearing device 11.

[0054] The bearing device 11a is configured in the form of a bearing frame 23a. This bearing frame has two longitudinal frame elements 24a, 25a which are longitudinally extended in the axial direction AR of the toothed rod element 5a. The longitudinal frame elements 24a, 25a are connected together by means of a transverse frame element 28a which is transversely extended to the axial direction AR. The toothed rod element 5a forms the longitudinal frame element 25a. The longitudinal frame element 24a, which may also be denoted as the first longitudinal frame element in the embodiment shown, is significantly shorter than the toothed rod element 5a. Said further guide elements are arranged on the first longitudinal frame element 24a and protrude outwardly in a manner corresponding to the guide elements 15a, 16a in the lateral direction. The cover element 2a is supported on the transverse frame element 28a and is connected thereto. To this end, the cover element 2a is screwed by means of a screw connection, in the present case comprising two screws 30a, to the transverse frame element 28a.

[0055] The cover element 2a has a flange portion 31a which is arranged on the lower face and which is oriented downwardly in the direction of the toothed rod element 5a. The transverse frame element 28a has a mating flange portion 32a which is arranged on the upper face and which is oriented upwardly in the direction of the cover element 2a. An adjusting element 33a is arranged between the flange portion 31a and the mating flange portion 32a. The adjusting element 33a is deformable in a rubber-elastic manner by means of said screw connection and permits an adjustment of the alignment of the cover element 2a relative to the bearing device 11a. To this end, in the ready-for-use mounted state, the cover element 2a may be aligned flush relative to the surface of the body portions of the body K surrounding the charging compartment T. The adjusting element 33a is designed in a complementary manner to a shape of the portions 31a, 32a and is produced from a rubber-elastic material.

[0056] The mode of operation of the closing arrangement 1a during the displacement movement of the cover element 2a from the closed into the open position is as follows:

[0057] In the closed position the guide elements 15a, 16a are located inside the respective reciprocating portion 191a, 201a of the respective guide track 19a and/or 20a. The drive gear 6a cooperates in the region of the first toothed portion Z1 with the toothed rod element 5a. For the displacement in the direction of the open position the drive gear 6a—relative to the drawing plane of FIG. 8—is rotated so as to be driven counterclockwise about the rotational axis D′. As a result, the toothed rod element 5a, together with the bearing device 11a and the cover element 2a located thereon, is displaced with reciprocating movement in the reciprocating direction. The guide elements 15a, 16a now move in the respective reciprocating portion 191a, 201a of the respective guide track 19a and/or 20a in a slidably guided manner. The guide tracks 19a, 20a are curved in some portions in a transition between the respective reciprocating portion 191a, 201a and the corresponding longitudinal portion 192a and/or 202a. With a movement of the guide elements 15a, 16a in this curved region, the drive gear 6a engages in the third toothed portion Z3. The curvature thereof opposes the curvature of the guide tracks 19a, 20a. With a further rotational movement of the drive gear 6a, this drive gear engages with the second toothed portion Z2. As a result, the toothed rod element 5a, together with the bearing device 11a and the cover element 2a located thereon, is moved with longitudinal movement and—relative to the drawing plane of FIG. 8—to the left. In this case, the guide elements 15a, 16a are supported on the respective longitudinal portion 192a and/or 202a of the guide tracks 19a, 20a. A displacement movement starting from the open position into the closed position is carried out in a kinematically reversed sequence.