WATERCRAFT WITH A LIFTING RAMP FOR VARIOUS AND NON-SPECIALLY PREPARED SMALLER BOATS

Description

[0001] The invention relates to a surface vehicle and in particular to a loading ramp of the watercraft, which makes it possible to load a wide variety of boats, which in particular do not have any special preparations for loading.

[0002] Loading ramps are common; for example, sea rescue cruisers have corresponding ramps from which a dinghy can be launched and retrieved. However, the ramp and dinghy are precisely matched, so that a sea rescue cruiser can usually only accommodate the dinghy built specifically for that sea rescue cruiser or a corresponding dinghy of the same design.

[0003] However, there is a growing demand for such a ramp to be able to accommodate a wide variety of boats. Two relevant scenarios are cited as examples: Firstly, it is advantageous, especially when different navies are working together, if a dinghy can be dropped off from one ship and picked up again by another. This can be useful, for example, for carrying out a mission, but it can also be used, for example, to evacuate a ship's crew. However, when ships from different navies from different nations are involved, this is often not possible due to a lack of compatibility.

[0004] A second important area of ​​operation is currently the Mediterranean, for example, where overloaded boats with refugees are regularly found. Here, too, admission may be preferable as the fastest way to rescue all persons on board. Such refugee boats, of course, cannot have any special features that would be necessary for special admission to a reception ramp.

[0005] Therefore, there are already some initial systems that can accommodate watercraft without special mounting features. For example, WO 2019 / 101590 A1 describes a mounting device with conveyor belts for a watercraft. However, the continuous conveyor belts require precise adaptation to the respective watercraft or its hull shape.

[0006] A mounting system, for example for small water sports vehicles, is known from US 2021 / 0114694 A1.

[0007] From DE 39 38 188 A1 a method and a device for hauling up a boat are known.

[0008] From WO 2014 / 062 131 A1 a device for launching and picking up a watercraft is known.

[0009] From WO 2019 / 101 590 A1 a receiving device and a receiving method with conveyor belts for a watercraft are known.

[0010] The object of the invention is to provide a robust and adaptable system for a loading ramp that can accommodate various smaller watercraft, especially those with different hull shapes, such as flat-hulled inflatable boats, classic V-shaped boats, or even small double-hulled boats. The only limiting requirement for the smaller watercraft should be that it fits into the loading ramp of the watercraft in terms of length, draft, height, and width.

[0011] This object is achieved by a surface vehicle having the features specified in claim 1. Advantageous further developments emerge from the subclaims, the following description and the drawings.

[0012] The surface vehicle according to the invention has a loading ramp. A small watercraft can be loaded onto the loading ramp.

[0013] The term "small watercraft" is used in the context of the invention only to make the smaller watercraft that is to be picked up linguistically easy to distinguish from the larger surface vehicle with the pickup ramp. According to the invention, small watercraft includes all possible watercraft that are to be picked up and set down by a surface vehicle. For example, these can be inflatable boats or rigid-hulled boats, such as those used as dinghies, rescue boats or boats for missions by emergency services. These can also be unmanned watercraft, for example the ARCIMS from Atlas Elektronik, which is designed as a double-hulled boat. The small watercraft can also be an underwater vehicle that is picked up while surfaced.

[0014] The surface vessel is designed to accommodate various small watercraft that are not specifically designed for this surface vessel. The goal is to accommodate as many different small watercraft as possible, provided they only fit in terms of size. Naturally, watercraft that are too large for the loading ramp cannot be accommodated. However, the idea is to be able to launch and retrieve not only very specific dinghies, i.e., boats that have a very specific docking device, for example.

[0015] The loading ramp has a loading direction. The small watercraft is loaded into the loading ramp along the loading direction. The loading direction is therefore the direction of movement in which a small watercraft is loaded on board the surface vessel. The loading ramp is usually located at the stern of a surface vessel. In this case, the loading direction usually corresponds to the longitudinal axis and direction of movement of the surface vessel. A loading ramp can also be arranged laterally, in which case the loading direction would be transverse to the longitudinal direction of the surface vessel. This can be advantageous, for example, if a surface vessel is to be equipped with multiple loading ramps.

[0016] The receiving ramp has a first receiving device, wherein the first receiving device has 8 to 200, preferably 8 to 100, more preferably 8 to 50, particularly preferably 8 to 20 axle assemblies.

[0017] Each axle assembly has a central axle element. The central axle element is arranged transversely to the pickup direction. The central axle element is arranged horizontally. Preferably, the central axle element is arranged rigidly horizontally. In this context, "horizontal" means parallel to the water surface with the ship in a normal position and without wave motion or other ship movements. "Rigid" in this context means stationary relative to the surface vessel. The central axle element can thus rotate, but cannot change its position relative to the surface vessel; for example, it cannot be tilted or shifted.

[0018] The axle assembly has two side axle elements.

[0019] The central axle element has at least one first roller element, and each lateral axle element has at least one second roller element. The first roller elements and the second roller elements are designed to contact the small watercraft. The small watercraft is intended to rest on the roller elements (supporting function) and to be moved by the roller elements (propulsion function).

[0020] The central axle element is connected to the lateral axle elements at both ends via a mechanical coupling. The mechanical coupling allows the central axle element and the lateral axle elements to rotate together. If one of the axle elements is driven, the driven axle element drives the other via the mechanical coupling. The mechanical coupling can also be achieved using belts, gears, friction wheels, constant velocity joints, cardan shafts, elastic shafts, or the like. The lateral axle elements can pivot relative to the central axle element. The mechanical coupling can be a joint, such as a universal joint. Accordingly, the joint is preferably arranged in the pivot axis of the lateral axle element. This pivotability allows the mounting device to adapt to different torso shapes.The pivoting capability is preferably at a 90° angle to the plane in which the loading ramp is arranged. For example, if the loading ramp has a gradient of 20°, the lateral axle elements are perpendicular to this plane and thus pivot in a plane at an angle of 20° to the vertical.

[0021] The first receiving device has a first drive, wherein the first drive is non-positively connected to a central axle element. Exactly two directly adjacent central axle elements are connected to one another in such a way that the exactly two adjacent central axle elements are connected together for rotation. Thus, each central axle element is directly non-positively connected to each directly adjacent central axle element, whereby a non-positive connection exists between two adjacent central axle elements that precisely and exclusively connects the two adjacent central axle elements to one another. It is therefore not a non-positive connection that connects all of the central axle elements to one another, for example a continuous conveyor belt.Connected to rotate together means that the force to drive the rotation is passed on from one central axle element to the next adjacent central axle element. The first drive is preferably connected to the central axle element that is furthest away from the receiving side. The receiving side is the side of the first receiving device that faces the water, which, if the receiving device is arranged at an angle, also corresponds to the lowest point of the receiving device. The first drive is therefore preferably arranged at the highest point or the point of the receiving device closest to the center of the ship. The first drive is therefore located at the end of the receiving device in the receiving direction.

[0022] The advantage of this mounting device is, on the one hand, its adaptability to various hull shapes and its comparatively flexible and unspecific drive. On the other hand, no special attachment is required on the small watercraft, for example to attach a hook or the like. The drive is also not realized via a central conveyor belt or the like. Instead, the linking of all elements creates a planar drive via static friction. Even a twin-hulled boat, which therefore does not rest on the first roller elements in the middle, is then propelled via the second roller elements by coupling the middle axle elements and the side axle elements. This provides the flexibility necessary to take any type of dinghy, rescue boat, emergency boat or refugee boat on board.

[0023] In a further embodiment of the invention, each central axle element arranged adjacent to two other central axle elements has a first connecting device for a force-locking connection with an adjacent central axle element and a second connecting device for a force-locking connection with the other, opposite, adjacent central axle element. A connecting device can be, for example, a V-belt, a toothed belt, or one or more gears. It is important that the connecting device always only connects exactly two adjacent central axle elements in a force-locking manner and not, as with a revolving conveyor belt, several or all of the central axle elements.The only exception here is the two outer middle axle elements, which naturally each have only one adjacent middle axle element and are therefore connected to the one adjacent middle axle element with only one first connecting device.

[0024] In a further embodiment of the invention, the first connecting device is arranged entirely below the highest point of the first roller element. Thus, the power transmission between the middle axle elements is completely separate from the power transmission from the first roller elements to a small watercraft.

[0025] In a further embodiment of the invention, each central axle element has at least two first roller elements.

[0026] In a further embodiment of the invention, each lateral axle element has at least two second roller elements.

[0027] By increasing the number of roller elements and their spatial distribution along the axle elements, greater flexibility is achieved.

[0028] In In a further embodiment of the invention, the connection via which the two adjacent central axle elements are connected in a rotating manner is made between two adjacent central axle elements with a V-belt, a toothed belt or a gear wheel. In In a further embodiment of the invention, the connections between adjacent central axle elements are arranged alternately on the opposite ends of the central axle elements. This achieves power transmission to all axle elements, allowing a small watercraft to be propelled easily and efficiently. Furthermore, this design enables modular production as well as easy retrofitting and integration of a support device according to the invention on various surface vehicles with different lengths of the support ramp.

[0029] In In a further embodiment of the invention, the element connecting two adjacent central axle elements, for example a V-belt or a toothed belt, has at least 50% of the width of the roller elements, provided that all roller elements have the same width. If the first roller elements and the second roller elements have different widths, the element has at least 50% of the width of the narrower roller element.

[0030] In a further embodiment of the invention, the element is a toothed belt, and each central axle element has two belt sprockets for transmitting power to the toothed belts. The diameter of the belt sprockets is preferably between 0.5 and 0.8 times the diameter of the first roller elements.

[0031] In a further embodiment of the invention, the element is a toothed belt or a V-belt, with the length of the element being selected so that it fits exactly over two adjacent central axle elements, possibly including a gear or the like. The disadvantage is that, with a precisely fitting length, replacement can only be achieved by removing the entire axle element. However, the power transmission is optimal.

[0032] In a further embodiment of the invention, the element is a toothed belt or a V-belt. Additionally, a tensioning element is arranged beneath the element and between each pair of central axle elements. A tensioning element can, for example, be a spring-loaded roller that presses against the toothed belt or V-belt from below, thus maintaining tension and ensuring reliable power transmission.

[0033] In a further embodiment of the invention, the lateral axle elements are held in an upper position by a force-loaded element and can be moved by a small watercraft mounted thereon into a variable position dependent on the shape of the small watercraft's hull. In a preferred development of this embodiment of the invention, the lateral axle elements are movable at an angle between 0° and 50° relative to the central axle element. For example, and in particular, the lateral axle elements are held in the upper position by a force-loaded element in the form of a spring, wherein the spring is preferably force-fitted to the end of the lateral axle element opposite the central axle element.

[0034] In a further embodiment of the invention, support elements are provided beneath the lateral axle elements, through which force is dissipated in the lowest position of the lateral axle elements. These support elements can have a spring element to prevent excessive impact and thus material stress when contact is established.

[0035] In a further embodiment of the invention, 2 to 8 axle assemblies are combined into a module and installed modularly into the first receiving device. In particular, an axle assembly can have a lower frame element. This allows for quick installation in a surface vehicle and also allows for easy adjustment to the length of the receiving ramp. Furthermore, this also enables simple modular replacement, especially at sea.

[0036] In a further embodiment of the invention, the axle assemblies are mounted in a frame, wherein the frame forms a sub-module, wherein a module can be produced by connecting sub-modules.

[0037] In a further embodiment of the invention, the module is functionally rotationally symmetrical. This means that the module can be installed in the receiving device in both directions.

[0038] In a further embodiment of the invention, the axis assembly is functionally rotationally symmetrical. This means that the axis assembly can be installed in the receiving device in either direction.

[0039] In another embodiment, each module has a drive. This has the advantage that the modules do not need to be connected. This embodiment is particularly advantageous for relatively large modules, especially those with 8 to 20 axis assemblies.

[0040] In a further embodiment of the invention, the module comprises a support, or the module can be mounted on a support, a beam, or a rail. The supports can be coupled together. The supports or rails preferably have alignment aids to each other and / or to the surface vehicle. The alignment aids can be configured, for example, in the form of a groove and shaped block, a pin and hole, or a form fit to the deck.

[0041] In a further embodiment of the invention, each module has at least one, preferably at least three, coupling elements for coupling to a lifting device, for example, a crane. A coupling element can be designed in the form of an eyelet or a hook.

[0042] In a further embodiment of the invention, the receiving ramp has a tailgate. The receiving ramp can preferably be closed via the tailgate. The tailgate has at least one first tailgate axle, and the first tailgate axle has at least one third roller element. The first tailgate axle is non-positively connected to the central axle element closest to the first tailgate axle. The first tailgate axle is particularly preferably arranged on the axis of rotation of the tailgate. This ensures the frictional connection between the central axle element closest to the first tailgate axle and the first tailgate axle in a very simple manner, regardless of the position of the tailgate. Alternatively, a frictional connection element, for example a gear, can be arranged on the axis of rotation of the tailgate.By effectively extending the loading device to the stern hatch, the loading point for a small watercraft is moved further down. This allows, for example, the loading ramp to be positioned higher within the surface vessel or to accommodate small watercraft with a deeper draft.

[0043] In a further embodiment of the invention, the tailgate has at least one second tailgate axle, wherein the first tailgate axle and the second tailgate axle are connected to one another in a force-locking manner. Preferably, the tailgate has at least two second tailgate axles, wherein two adjacent tailgate axles are each connected to one another in a force-locking manner.

[0044] This type of tailgate allows the drive to be easily brought under water and thus under a small watercraft arriving on the water.

[0045] In a further embodiment of the invention, the tailgate has a tailgate drive, wherein the tailgate drive is designed to open and close, in particular to raise and lower, the tailgate.

[0046] In a further embodiment of the invention, the tailgate has a locking element, wherein the locking element serves to fix the tailgate in the closed position.

[0047] In a further embodiment of the invention, the receiving device has at least one brake, for example a brake wedge, for braking or blocking a first roller element. The brake wedge is preferably arranged such that it can be pushed under and thus against a roller element by a lateral movement, thus braking or even blocking it. The brake serves in particular to stop the receiving device if an element that non-positively connects the central axle elements, for example a V-belt or a toothed belt, is no longer functional, for example if a toothed belt breaks. In this way, the brake, for example via the brake wedge, can prevent the small watercraft from slipping and thus possibly being lost at sea.

[0048] In a further embodiment of the invention, the receiving device has at least one brake, in particular one brake chock, for every 2, 3, 4, 5, or 6 axle assemblies. Thus, a brake chock is arranged on every second, third, fourth, fifth, or sixth axle assembly. This ensures, on the one hand, that sufficient braking force is achieved. On the other hand, the number of brakes that can be damaged in the event of a connection failure between two adjacent central axle elements is limited to a maximum of the number of axle assemblies between two brake chocks.

[0049] In another embodiment of the invention, the brake can be triggered electrically. The advantage of electrical triggering is primarily its simpler integration. While hydraulic or pneumatic systems can easily develop large forces, they are complex to integrate into the ship's systems.

[0050] In a further embodiment of the invention, each module has a brake.

[0051] In a further embodiment, each axle assembly provided with a brake has a sensor which can detect a rapid rotation of the axle, in particular a low-force rotation, and in this case triggers the brake.

[0052] In a further embodiment of the invention, the receiving ramp has a second receiving device, wherein the second receiving device is arranged behind the first receiving device in the receiving direction. The second receiving device thus serves practically as a parking position for a second small watercraft, while another small watercraft can be picked up or set down via the first receiving device. Due to the consecutive arrangement, the second small watercraft can only be brought into the water or picked up when the first receiving device is empty, i.e. no small watercraft is present there. The second receiving device has a second drive, so that the first receiving device and the second receiving device can be operated together or separately.Preferably, the first receiving device is arranged inclined and the second receiving device is arranged less inclined or horizontally.

[0053] The surface vehicle according to the invention is explained in more detail below using an embodiment shown in the drawings. Fig. 1 Perspective view of the loading ramp Fig. 2 Enlargement upper end Fig. 3 Enlargement lower end Fig. 4 module Fig. 5 Timing belt and brake wedge Fig. 6 lateral axle element Fig. 7 Tailgate submerged Fig. 8 various small watercraft on the mounting device Fig. 9 Receiving ramp with small watercraft in cross section

[0054] In Fig. 1 A receiving ramp 10 is shown in a side perspective view. For simplicity, further details of the surface vehicle are omitted. In the receiving direction 280, at the beginning of the receiving device 20, a tailgate 40 is shown, and at the other end, the first drive 30. Enlarged sections are shown in Fig. 2 and Fig. 3 shown.

[0055] Fig. 2 shows the upper end of the receiving device 20. Axle assemblies arranged one behind the other can be seen. These each have a central central axle element 50 and, at each end thereof, two lateral axle elements 60. Each central axle element 50 is provided with two first roller elements 70 and each lateral axle element 60 with two second roller elements 80, wherein the two second roller elements 80 are arranged relatively close together. The lateral axle elements 60 can be pivoted about a pivot axis 110 and thus adapt to different hull shapes of small watercraft. For this purpose, the lateral axle elements 60 are connected to spring modules 90, which hold the lateral axle elements 60 in the uppermost position against the load of a small watercraft.

[0056] To drive the axes of the axle assemblies, the adjacent central axle elements 50 are each connected to each other via a toothed belt 100. The first drive 30 provides the drive via a toothed drive belt 170.

[0057] In Fig. 3 The rear area with the tailgate 40 can be seen. From the receiving device 20, the middle axle elements 50 with the first roller elements 70 can be seen, which are connected to toothed belts 100. A first tailgate axle is arranged on the rotational axis of the tailgate 40. This first axle is connected in a force-locking manner to the nearest middle axle element 50. Two second tailgate axles 140 are arranged on the tailgate 40, each having four third roller elements 150. In addition, fenders 160 are arranged on the upper, outer corners of the tailgate 40, which in Fig. 7 is clearly visible.

[0058] The Fig. 4 , Fig. 5 und Fig. 6 show enlargements of individual components.

[0059] In Fig. 4 A module consisting of four axle assemblies is shown. Using a module frame 180, the modules can be easily prefabricated and quickly integrated into a surface vehicle. This also simplifies replacement. In this view, the joint 200, which connects the central axle element 50 to the lateral axle elements 60, is clearly visible. The joints 200 are arranged on the pivot axis 110 so that the rotation of the axles can be transmitted regardless of the angle. Furthermore, contact elements 190 can be seen, which stabilize the lateral axle elements in the lowest position, for example when picking up a small watercraft with a very flat bottom.

[0060] Fig. 5 shows a cross-section through two adjacent axle assemblies, so that only half of the middle axle element 50 and a lateral axle element 60, which is located behind the middle axle element 50 in the section, are visible. As a result, the toothed belt 100 connecting the two middle axle elements 50 is partially concealed by the first roller elements 70. Visible here is a tensioning element 230, which presses against the toothed belt 110 from below and thus maintains the tension of the toothed belt 100. Furthermore, the brake wedge 210 arranged on the module frame 180 can be seen. This brake wedge can be moved by the brake motor 220, for example in the form of an adjusting cylinder. If the brake wedge 210 is moved to the right in the geometry shown, this brake wedge 210 brakes or blocks the right first roller element 70.Also clearly visible are the separate pivot axes 110 for each lateral axle element 60, so that optimal adaptation to the fuselage shape, which usually varies in the longitudinal direction, is possible.

[0061] In Fig. 6 Only the lateral axle element 60 is shown enlarged. The spring module 90 is shown semi-transparent to show the internal spring.

[0062] Fig. 7 shows the loading ramp 10 with the stern door 40 lowered into the water. The third roller elements 150 are now positioned underwater and can thus easily accommodate a small watercraft.

[0063] Fig. 8 shows a cross-section of three different indicated small watercraft 240, 250, 260. The lateral axle elements are in a lowered shape of approximately 11° to adapt to the flat bottom of the twin-hulled small watercraft 260. At a steeper angle, for example approximately 40°, the lateral axle elements with the second roller elements 80 would adapt to the V-shaped hull of the small watercraft 240.

[0064] The advantage of the device according to the invention is particularly evident in the case of the twin-hulled small watercraft 260. For example, a central conveyor belt could not grip the hull and thus not take the small watercraft 260 on board. In the present case, all roller elements in all positions serve to drive the small watercraft 240, 250, 260. Thus, the receiving device according to the invention can accommodate any unprepared small watercraft 240, 250, 260.

[0065] Fig. 9 The side view shows the receiving ramp 10 with the small watercraft 270 located there. Reference symbol

[0066] 10 Pick-up ramp 20 Pick-up device 30 First drive 40 Tailgate 50 Middle axle element 60 Side axle element 70 First roller element 80 Second roller element 90 Spring module 100 Toothed belt 110 Swivel axis 130 First tailgate axis 140 Second tailgate axis 150 Third roller element 160 Fender 170 Drive toothed belt 180 Module frame 190 Contact element 200 Joint 210 Brake wedge 220 Brake motor 230 Tensioning element 240 Small watercraft 250 Small watercraft 260 Small watercraft 270 Small watercraft 280 Pick-up direction

Claims

1. A surface vessel with a pick-up ramp (10) for a small watercraft (240, 250, 260, 270), the surface vessel being designed to pick up various small watercraft (240, 250, 260, 270), the pick-up ramp (10) having a pick-up direction (280), the small watercraft (240, 250, 260, 270) being picked up in the pick-up ramp (10) along the pick-up direction (280), the pick-up ramp (10) having a first pick-up device (20), wherein the first receiving device (20) has 8 to 200 axle assemblies, wherein each axle assembly has a centre axle element (50), wherein the centre axle element (50) is arranged transversely to the receiving direction (280), wherein the centre axle element (50) is arranged horizontally, wherein the axle assembly has two lateral axle elements (60), wherein the centre axle element (50) has at least one first roller element (70) and each lateral axle element (60) has at least one second roller element (80), wherein the first roller elements (70) and the second roller elements (80) are designed for contact with the small watercraft (240, 250, 260, 270), wherein d he centre axle element (50) is connected at both ends to the lateral axle elements (60) in each case via a mechanical coupling, so that the centre axle element (50) and the lateral axle elements (60) are jointly rotatable, wherein the lateral axle elements (60) are pivotable relative to the central axle element (50), wherein the first receiving device (20) has a first drive (30), wherein the first drive (30) is non-positively connected to a central axle element (50), wherein in each case exactly two neighbouring central axle elements (50) are connected to one another in such a way that the in each case exactly two neighbouring central axle elements (50) are connected to rotate together.

2. Surface water vehicle according to claim 1, characterised in that each central axle element (50), which is arranged adjacent to two further central axle elements (50), has a first connecting device for force-locking connection to an adjacent central axle element (50) and a second connecting device for force-locking connection to the other, opposite, adjacent central axle element (50).

3. Surface water vehicle according to claim 2, characterised in that the first connecting device is arranged completely below the highest point of the first roller element (70).

4. Surface water vehicle according to one of the preceding claims, characterised in that the connection between two adjacent central axle elements (50) is produced with a V-belt, a toothed belt (100) or a toothed wheel.

5. Surface water vehicle according to one of the preceding claims, characterised in that the force-locking connections between adjacent central axle elements (50) are each arranged alternately on the opposite ends of the central axle elements (50).

6. Surface watercraft according to one of the preceding claims, characterised in that the lateral axle elements (60) can be held in an upper position by a force-loaded element and are moved into a variable position dependent on the shape of the hull of the surface watercraft (240, 250, 260, 270) by a small watercraft (240, 250, 260, 270) taken up.

7. Surface water vehicle according to claim 5, characterised in that the lateral axle elements (60) can be moved at an angle of between 0° and 50° relative to the central axle element (50).

8. Surface water vehicle according to one of the preceding claims, characterised in that in each case 2 to 8 axle assemblies are combined to form a module and are each installed in the first receiving device (20) in modules.

9. Surface water vehicle according to one of the preceding claims, characterised in that the receiving ramp (10) has a tailgate (40), wherein the tailgate (40) has at least one first tailgate axle (130), wherein the first tailgate axle (130) has at least one third roller element (150), wherein the first tailgate axle (130) is non-positively connected to the central axle element (50) closest to the first tailgate axle (130).

10. Surface water vehicle according to claim 9, characterised in that the first tailgate axle (130) is arranged on the axis of rotation of the tailgate (40).

11. Surface water vehicle according to one of claims 9 to 10, characterised in that the tailgate (40) has at least one second tailgate axle (140), wherein the first tailgate axle (130) and the second tailgate axle (140) are non-positively connected to one another.

12. Surface water vehicle according to one of the preceding claims, characterised in that the receiving device (20) has at least one brake, preferably a brake wedge (210), for braking or blocking a first roller element (70).

13. Surface craft according to claim 12, characterised in that the brake, preferably the brake wedge (210), is electrically releasable.

14. Surface water vehicle according to one of the preceding claims, characterised in that the receiving ramp (10) has a second receiving device (20), the second receiving device being arranged behind the first receiving device (20) in the receiving direction (280), the second receiving device having a second drive, so that the first receiving device (20) and the second receiving device can be operated together or separately.