Motor vehicle with tilting loading platform

Abstract

A motor vehicle (10; 10') designed as an articulated transporter - with a front section (26) and a rear section (27) coupled to the front section (26), wherein the front section (26) and the rear section (27) are coupled to each other via a pivot axis (25) perpendicular to the direction of travel - and with a loading platform (11; 41) arranged on a chassis (44), which together with the rear section (27) can be tilted from a driving position (FP) to a loading position (LP) about the pivot axis (25), characterized in that - the loading platform (11; 41) and / or the chassis (44) is coupled to a support device (12; 42) which is movable relative to the loading platform (11; 41) and / or the chassis (44) from a working position (AP) to a rest position (RP), - at least one working cylinder (19, 19') for exercising the A change in position of the carrier device (12; 42) relative to the loading platform (11; 41) is provided.

Description

The invention relates to a motor vehicle having a loading platform which is arranged on a chassis and which can be tilted from a driving position into a loading position about a pivot axis which is perpendicular to the driving direction, and to a method for operating such a motor vehicle. These vehicles frequently have a truck chassis and are used above all for transporting cars, in particular as roadside assistance vehicles.Vehicles are known from the prior art, the loading platform of which is designed as a so-called sliding plateau, which can be hydraulically tilted and displaced. If these vehicles also have a trailer coupling, then this is not attached to the sliding plateau, but to the vehicle frame. When the sliding plateau is pushed off, sufficient space is present in the region of the trailer coupling so that the sliding plateau can be pushed away beyond the trailer coupling.It is also known to install telescopic extension pipes with foldable spectacle elements on the roadside assistance vehicles, which telescopic extension pipes form troughs for receiving wheels of the vehicle to be rescued. The linearly reciprocating telescopic extension pipes are fastened directly to the correspondingly reinforced tilting frame of the roadside assistance vehicle. Furthermore, lift glasses are known whose telescopic extension tube is fastened by one of its ends to the chassis of the vehicle and is arranged there pivotably, so that the glass elements point upward in the rest position of the vehicle.DE 101 38 321 A1 discloses a tow vehicle having a loading platform fixed on a vehicle chassis. In the rear edge region of the tow vehicle, lifting glasses are mounted below the loading bed. With the lifting glasses extended, a motor vehicle can be transported on the loading bed and a second vehicle with at least one intact wheelset on the lifting glasses can be transported in this way. The tow vehicle may include a winch for pulling a damaged vehicle onto the cargo bed. The manner in which the raising takes place and whether, for example, ramp-on ramps are provided for this purpose or the loading bed is displaceable or pivotable is not disclosed.DE 41 13 748 A1 discloses a motor vehicle having a chassis and a fixed frame of a sliding plateau which is mounted on the chassis. The sliding plateau comprises a tilting frame on which a loading platform pivotable about an axis of rotation and displaceable in the longitudinal direction is arranged. At the rear end of the tilting frame as viewed in the direction of travel, adjustable lifting spectacles are also used. The coupling point of the lifting glasses and tilting frames is located in the vicinity of the axis of rotation. In order to be able to place the rear end of the loading platform on the underlying surface, the loading platform must first be displaced considerably beyond the rear end of the tilting frame and the lifting spectacles attached thereto. After the loading platform has been pushed out, it is possible to tilt the loading platform about the rotational axis provided in this respect and thereby ensure that the first contact with the ground takes place through the end of the loading platform and not, for example, through the lifting glasses. A disadvantage here is that it is not possible to tilt the loading platform into a position contacting the ground without prior rearward extension of the platform.Furthermore, DE 198 46 340 A1 discloses a roadside assistance vehicle designed as a articulated transporter. In contrast to the roadside assistance vehicles with sliding plateaus, in this vehicle the loading surface is not pushed back, but is tilted by means of a hydraulic cylinder in the region between the vehicle cabin and the loading platform. The vehicle cabin and the loading platform are thus connected to one another in an articulated manner. In order to realize a flat approach angle, a loading ramp is also provided at the vehicle rear.In this vehicle, namely a articulated transporter, the attachment of an additional trailer coupling to the rear of the vehicle is problematic: on the one hand, the trailer coupling and loading ramp would be in the way towards each other, on the other hand, a trailer coupling attached in the rear region below the loading platform would be placed on the underlying surface when the loading platform is tilted.The object therefore is to equip a roadside assistance vehicle designed as a articulated transporter with additional technical means which do not impair the tilting of the loading platform while maintaining a low angle of approach and with which both a trailer coupling and a telescopic extension pipe with spectacle elements can be installed. In this case, the technical means are intended to find space in a space-saving manner below the tiltable loading platform. The object is furthermore to propose a method that enables safe operation of a motor vehicle provided with a tiltable loading platform and additional technical means.This object is achieved according to the invention by a motor vehicle having the features of claim 1. Advantageous embodiments of the invention can be taken from the dependent claims.According to the invention, a motor vehicle with a tiltable loading platform is provided, in which:the chassis is coupled to a carrier device which is movable with respect to the loading platform or the vehicle frame from an operating position into a rest position,at least one working cylinder for performing the change in position of the carrier device relative to the loading platform.Definitions:The "support device" representing the additional technical means is understood to mean a swing frame which is arranged below the loading platform and is suspended on the loading platform or on the chassis and can be lowered and displaced with respect to the chassis or the loading platform.The "driving position" is understood to mean a substantially plane-parallel position of the loading platform relative to the road or the underlying surface. The loading platform is located in this position when the motor vehicle participates in road traffic.The "loading position" is understood to mean a position of the loading platform inclined with respect to the road or the underlying surface. In this position, the loading platform forms an inclined plane adjoining the underlying surface, onto which a load, in particular a further motor vehicle, can be drawn or driven.Under the "working position" a position of the carrier device is to be provided in which the trailer coupling attached to the carrier device is located in the end region of the rear of the vehicle and can be coupled to the drawbar of a trailer.The "rest position" is understood to mean a position of the carrier device in which the tow coupling has been moved away from the end region of the vehicle rear. When the carrier device is in the rest position, the trailer coupling has thus also left its original position, so that a free space is formed in the region, which can be used to bring the rear region of the loading platform close to the underlying surface during tilting.According to the invention, the trailer coupling is not rigidly attached to the loading platform or its frame, but to the carrier device, which is movable relative to the loading platform. At least when the loading platform is tilted, the trailer coupling can thus be pivoted or pushed into a position which does not obstruct the tilting process and does not impair the tilting angle to be realized by placing the trailer coupling on.In principle, the outward pivoting and / or outward sliding of the carrier device with the trailer coupling mounted thereon could also be realized with a mechanical or kinematic coupling. However, such a connection is complicated with regard to the required number of parts and the design of guides and levers. In order to avoid such problems, according to the invention a working cylinder is provided by means of which the carrier device can be moved relative to the loading platform. To improve the stability and / or to more evenly introduce force, two or more working cylinders can also be provided.The working cylinder is preferably a hydraulic or pneumatic cylinder. However, the use of other working cylinders, for example electric cylinders, is not excluded.The carrier device has at least one pivot arm. The pivot arm is coupled at its one side to the loading platform and is rotatable or pivotable about an axis of rotation. In particular for stability reasons, one or more further pivot arms can also be provided, all of which can be rotated on the same axis of rotation.The working cylinder is likewise coupled with its one end to the loading platform and with its other end to the carrier device. When the working cylinder is extended or retracted, the carrier device is thus moved relative to the loading platform. Although it is particularly preferred that the carrier device is pivoted about an axis of rotation, other types of movement, for example linear insertion into a guide frame, are also not excluded. It is essential that the carrier device-and with it the trailer coupling-is moved relative to the loading platform and a free space is created by the change in position in the rear region of the motor vehicle.The pivot arm is rotatable during the change from the working position into the rest position by an angle of more than 20°, preferably more than 60° and most preferably by more than 90°. The change in position of the carrier device depends on the length of the pivot arm and the size of the angle of rotation. A large angle of rotation thus enables a sufficiently large change in position of the trailer coupling or the creation of a sufficiently large free space for the tilting of the loading platform even with a short pivot arm length.An embodiment is particularly preferred in which a second pivot arm is provided for coupling the carrier device to the tiltable loading platform. A second pivot arm is understood in this context to mean a further pivot arm which is rotatable about a further axis of rotation.It is particularly advantageous if the pivot arms mounted on different axes of rotation are of equal length and form at least one parallelogram guide. In the art, a parallelogram linkage denotes a mechanism by means of which the load fastened to a lever is kept at the original angle of inclination (in the plane of the lever path) even when moved along the path of the lever.For this purpose, according to the definition of a parallelogram, links of equal length are mounted on the axles at the load and pivot point, which links are connected to one another at their other end via a further link along the length of the lever arm (definition wikipedia).The configuration as a parallelogram guide means that the angle of inclination of the tow coupling arranged on the carrier device is unaffected: while, during a rotation of the carrier device about a single pivot arm, the tow coupling is likewise rotated, the orientation of the tow coupling remains unchanged when using a parallelogram guide means. In the case of a single pivot arm, a trailer coupling initially pointing horizontally to the rear from the vehicle rear is rotated into a vertically downward pointing position. This results in an additional space requirement during the pivoting movement, which is avoided by using a parallelogram linkage.In order to prevent the carrier device from clapping or striking the loading platform during road travel, it can be provided that the working cylinder exerts a contact pressure when the carrier device is in the working position and / or in the rest position. The carrier device is thus pressed by the working cylinder against the loading platform. Additionally or alternatively, one or more stop elements can be provided between the carrier device and the loading platform. If the stop element consists, for example, of a rubber or plastic block or another resilient material, damping additionally takes place. Suddenly occurring impacts, such as those occurring when a striking hole located in the roadway passes over, can thus be compensated or cushioned.In a preferred embodiment, a sensor device is provided for determining the position of the carrier device relative to the loading platform. By means of this sensor device, the current position of the carrier device can be displayed to the operator. This reduces the risk of incorrect operation, which can consist, for example, in the operator issuing a control command for tilting the loading platform when the carrier device is in the working position. The sensor device can be attached to the carrier device or to the loading platform, but can also be integrated directly into a working cylinder. Regardless of where the sensor device is attached, it is important that at least one end position position of the carrier device relative to the loading platform is detectable.The sensor device may comprise a proximity switch, which is preferably mounted on a working cylinder. Proximity switches are sensors which react in a contactless manner to approach, i.e. without direct contact. By means of a proximity switch, the two end position positions of the cylinder can be detected reliably. The detection of the end position can be used to trigger an indicator or control signal. For example, a warning light can be switched on a workstation display and the operator can be informed about the reaching of a specific position.The proximity switch can be an inductive or capacitive switch. However, magnetic switches such as reed relays or optical switches, for example in the form of a light barrier, are also possible.Alternatively to position detection by means of a proximity switch operating in a contactless manner, cam switches are also possible. Cam switches allow accurate, flexible and above all robust position detection.In a preferred embodiment, a control device is provided on the motor vehicle, by means of which the sequence of the movements is determinedloading platform is tilted from the travel position into the loading position, andcarrier device is moved relative to the loading platform from the working position into the resting position predefinable.Preferably, a regulation is provided, in which the tilting of the loading platform can be carried out only when the carrier device is arranged in the rest position. This prevents the loading platform from being able to be tilted when the tow coupling is in the working position, i.e. in the rear rear region. If the loading platform were tilted when the trailer coupling is in this position, a collision of the trailer coupling with the underlying surface would occur when a specific tilt angle is reached, and damage would thereby occur or at least an uncomfortable loading position would occur.The object according to the invention is furthermore achieved by a method for operating a motor vehiclea loading platform tiltable from a travel position into a loading positionand a carrier device with a trailer coupling and / or lifting spectacles comprising, prior to the change in position of the loading platform from the travel position into the loading position, the carrier device being moved from a working position into a rest position.The particular advantage of this sequence is that tilting of the vehicle when the carrier device is in the working position can be prevented as a result.The background is that when the carrier device is in the working position, the tow coupling is placed on the underlying surface and when the tow coupling is placed, damage has already occurred and a movement of the carrier device is no longer possible because of the force acting on the carrier device through the underlying surface and the lack of free space.It is particularly advantageous if, before the start of the change in position of the loading platform, the position of the carrier device relative to the loading platform is checked by means of a sensor device. By this check, the operator receives a secured information about the current position of the carrier device and can define and implement his further procedure on the basis of this information.The decision to be made by the operator can also be carried out and implemented in an automated manner. For this purpose, it can be provided that the sensor device transmits a control command to a control device when the carrier device is in the rest position and / or in the working position, as a function of which a release for changing the position of the loading platform is issued. It can thus be ensured that:the loading platform can only be moved from the travel position into the loading position when the carrier device is in the rest position and / orthe carrier device can only be moved from the rest position into the working position when the loading platform is in the travel position.The invention is described below in two examples and is illustrated in the figures. FIG. 1 shows a motor vehicle with a loading platform in the travel position and a trailer coupling attached to a carrier device in the working position; FIG. 2 shows the motor vehicle from FIG. 1 with the loading platform in the driving position and the trailer coupling in the resting position; FIG. 3 shows the motor vehicle from FIG. 1 with the loading platform in the loading position and the trailer coupling in the working position; FIG. 4 shows the motor vehicle from FIG. 1 with the loading platform in the loading position and the trailer coupling in the resting position; FIG. 5 shows the carrier device with a trailer coupling in a perspective illustration; FIG. 6 shows a perspective illustration of a working cylinder with proximity switches; FIG. 7 shows a side view of a working cylinder from FIG. 6 ; FIG. 8 shows the area of the loading platform and the carrier device in the working position in a perspective illustration from below; FIG. 9 shows the area of the loading platform and the carrier device in the rest position in a perspective illustration from below; FIG. 10 shows the rear region of the loading platform with the carrier device pivoted out into the working position in a perspective illustration from behind; FIG. 11 shows the rear region of the loading platform with the carrier device pivoted into the rest position in a perspective illustration from behind; FIG. 12 shows a motor vehicle with a sliding plateau in the loading position, in a side view; FIG. 13 shows the motor vehicle according to FIG. 12 in a perspective view from above; FIG. 14 shows a rear region of the motor vehicle with a sliding plateau, with a carrier device in the rest position, in a simplified perspective illustration from below; FIG. 15 is a bottom view of a rear part of the motor vehicle with a sliding plateau, with the carrier device visible in its rest position; FIG. 16 shows the rear region of the motor vehicle with a sliding plateau, with a partially visible telescopic tube, in a side view; FIG. 17 shows the rear region according to FIG. 16 in a perspective illustration from below; FIG. 18 shows the rear region of the motor vehicle with the sliding plateau, with the telescopic tube pulled out and the spectacle frame folded out, in a perspective view from above; FIG. 19 shows the rear region according to FIG. 18, but with the spectacle frame pulled back and the tow coupling mounted, in a perspective view; FIG. 20 shows the rear region according to FIG. 18, with the spectacle frame folded out, in a perspective illustration from below; FIG. 21 shows the complete carrier device with telescopic tube and unfolded spectacle frame, in a perspective view; FIGS. 22, 23 to 24 show a parallelogram guide of the carrier device according to FIG. 21, with the telescopic extension tube folded in and out, each in a schematic side view; FIG. 25 shows the rear region of the motor vehicle in a manner similar to FIG. 16, in the working position.Identical or similar elements can be provided with identical or similar reference numerals in the following figures. Furthermore, the figures of the drawing, their description and the claims contain numerous features in combination. A person skilled in the art will understand that these features can also be considered individually or they can be combined to form further combinations which are not described in more detail here.FIGS. 1, 2, 3 to 4 show a motor vehicle 10 standing on a standing surface 30 with a front part 26 and a rear part 27. front part 26 and rear part 27 are connected to one another by a joint 25. By means of a hydraulic cylinder, not shown in more detail, the front part 26 and the rear part 27 are pivotable relative to one another (cf. FIGS. 3 and 4 ). The rear part 27 comprises a loading platform 11 and a trailer coupling 13 attached to a carrier device 12.FIG. 1 shows the motor vehicle 10 in a driving position in which it can participate in traffic, in particular on public roads. The trailer coupling 13 is attached in the rear region 20. In the working position AP, the trailer coupling 13 protrudes beyond the platform end 21, so that a trailer (not shown) can be coupled if necessary. The motor vehicle 10 has an air suspension or a hydropneumatic chassis 22, the chassis 22 having two axles 23 and 24, the axle 24 being a lift axle in the exemplary embodiment shown. Alternatively, the axle 23 can also be designed as a lift axle.FIG. 2 shows the motor vehicle 10 with the carrier device 12 pivoted in in the rest position RP (cf. FIG. 9 ). The motor vehicle 10 is also ready for driving in this state. In particular, when no load is being carried, the raised axle 24 protects the tires, reducing fuel consumption.FIG. 3 shows the motor vehicle 10 with the front part 26 and the rear part 27 pivoted about the joint 25 During the pivoting movement, the rear part 27 is supported on the suspension of the chassis.However, FIG. 3 also shows that the rear region 20 cannot be lowered as far as the support surface 30, because the trailer coupling 13 is in the way. The loading platform 11 is pivoted relative to the support surface 30 by an angle β, which in principle enables vehicles to be towed to be pulled up or onto. The loading platform 11 is thus located in the loading position LP. However, the loading ramps 31 provided for bridging the distance between platform end 21 and footprint 30 do not extend as far as footprint 30 in the linear orientation shown in FIG. 3 with respect to the loading platform 11. Instead, a distance 37 remains. In this context, a linear alignment is to be understood to mean that loading ramps 31 and loading platform 11 lie in one plane and have the same angle β with respect to the contact surface 30.In order to contact the support surface 30, the loading ramps 31 would thus have to be either extended or pivoted with respect to the loading platform 11. Both have disadvantages: extended loading ramps are more unstable and require an increased space requirement, bent ramp-ups increase the angle of approach β, so that in particular vehicles to be towed with low road clearance can be drawn or run onto the loading platform with difficulty or not at all.FIG. 4 shows, analogously to FIG. 3, the motor vehicle 10 with the rear part 27 bent away in the loading position LP. In contrast to FIG. 3, however, the carrier device 12 with the trailer coupling 13 is in the rest position RP. The rear region 20 can therefore be discharged as far as the footprint 30. The loading ramps 31 are aligned linearly with the loading platform 11 and extend as far as the contact surface 30. A vehicle to be charged can thus be easily towed or driven onto the loading platform 11.FIG. 5 shows a first exemplary embodiment of the carrier device (reference numeral 12). The carrier device 12 comprises two pivot arms 14, 14' and two further pivot arms 15, 15'. For coupling the carrier device 12 to the loading platform 11, the pivot arms 14, 14', 15 and 15' have pivot bearings 28, 28' at their one end. By means of the working cylinders 19, the swivel arms 14 and 14' are rotatable about a first axis of rotation 35 and the swivel arms 15' and 15' are rotatable about a second axis of rotation 36.At the other end of the swivel arms 14, 14', 15 and 15' a further pivot bearing 32, 32' is provided in each case, which connects the swivel arms to longitudinal beams 33, 33'.The pivot arms 14 and 15, the rigid platform region, not shown in FIG. 5, between the two pivot bearings 28 and the longitudinal beams 33 thus form a parallelogram linkage. Analogously to this, the pivot arms 14' and 15', the rigid platform region, not shown in FIG. 5, between the two pivot bearings 28' and the longitudinal support 33' likewise form a parallelogram guide. The two parallelogram guides are connected by means of a cross member 34, to which the trailer coupling 13 is attached.The parallelogram guidance has the effect that the angle of inclination of the trailer coupling 13 arranged on the cross member 34 remains unaffected during the pivoting of the carrier device 12. The trailer coupling 13 therefore does not rotate in the direction of the support surface 30 when the carrier device 12 is pivoted from the working position AP into the rest position RP. The design as a double parallelogram guide also gives the carrier device 12 very high strength and torsional rigidity. In order to pivot the carrier device 12 from the working position AP into the rest position RP-and vice versa-two working cylinders 19, 19' are provided. To increase the safety against leaks in the hydraulic system, the working cylinders are provided with a double-unlockable check valve. This also prevents the carrier device 12 from becoming detached when a hydraulic hose leading to the working cylinder 19 bursts and falling onto the roadway or footprint.FIGS. 6 and 7 show one of the two working cylinders 19, and the working cylinder 19 shown is equipped with a sensor device 17. The sensor device 17 is a proximity switch 18; in order to enable an end position interrogation to be carried out on both sides of the working cylinder 19, 19', a proximity switch is provided at each of the two end position positions. The proximity switches 18 are connected to a control unit, not shown. The control unit is designed such that the pivoting of the loading platform 11 from the travel position FP into the loading position LP can only take place when the carrier device 12 is in the rest position RP and thus the free space 29 is available in the rear region 20. As an alternative to the use of a proximity switch 18 integrated into a working cylinder 19, 19', the position determination of the carrier device 12 can also be detected externally of the working cylinder, for example with a proximity switch mounted at a different point than the working cylinder, with a mechanical switch or an optical switch, such as a light barrier.FIGS. 8 and 9 show the carrier device 12 in the state in which it is mounted on the loading platform 11. In FIG. 8, the carrier device 12 and thus the trailer coupling are in the working position AP. In FIG. 9, the carrier device 12 is in the rest position RP.FIGS. 10 and 11 show the rear region 20 of the motor vehicle 10. In FIG. 11, the carrier device 12 is pivoted under the loading platform 11 into the rest position RP and is therefore not visible in FIG. 11. Instead of the carrier device 12 with the trailer coupling 13, the free space 29 is thus obtained which is advantageous for lowering the rear of the vehicle.FIGS. 12 and 13 show a motor vehicle 10' standing on the standing surface 30 with a loading platform 41 present as a sliding plateau, comprising the front part 26 and the rear part 27. The rear part 27 comprises the loading platform 41, a base frame 51 with chassis 22, and a support device 42 shown in FIG. 21 placed below the loading platform 41. while the support device 12 of the 1st exemplary embodiment (see in particular FIG. 5 ) is provided only for supporting a trailer coupling, the support device 42 is provided as a holder for a flat frame 48, also called tow glasses, lifting glasses or spectacle frames. At the rear end of the sliding plateau, two rubber-like stop elements 16 are arranged, with which impacts and vibrations can be located when the vehicle to be transported or rescued is started. Furthermore, FIG. 13 shows a guide frame 52 for the sliding plateau. The motor vehicle 10' is in the loading position LP.The motor vehicle 10' thus differs from the motor vehicle 10 in that, on the one hand, the loading platform can be extended (sliding plateau) and, on the other hand, the carrier device carries a flat frame 48 (spectacles). Of course, the invention can also be realized in a 3rd embodiment (not shown) in which a non-deployable tilting plateau not only has a trailer coupling, as in the 1st embodiment, but a flat frame with spectacles.As an alternative to the embodiment with a longitudinal member, the support device 42 (cf. FIG. 21 ) does not comprise one longitudinal member pair 38, 39 which is situated in tandem and each comprises two longitudinal members 33, 33'; 43, 43' connected to one another via a cross member 34; 40. The cross members 34; 40 carry a telescopic extension tube 46, which is rigidly connected to the front cross member 40 and is arranged displaceably on the rear cross member 34. The telescopic extension tube 46 in turn carries at its rear end 47 a foldable flat frame 48 which comprises a cross member 49 and two troughs 53 consisting of struts for receiving wheels of an axle of the vehicle to be transported. In order to pivot the carrier device 42 from the working position AP into the rest position RP-and vice versa-two working cylinders 19, 19' are provided.FIG. 16 shows the rear of the vehicle 10' (cf. FIG. 12 ) before the loading platform 41 (sliding plateau) is pushed away into the loading position LP. It can be seen from FIG. 16 that neither the folded flat frame 48 nor the trailer coupling 13 have contact with the support surface 30.The longitudinal beams 33, 33'; 43, 43' of the carrier device 42 and their suspension are identical to those of the carrier device 12 according to the first embodiment, with the difference that there is no hitch coupling 13 on the cross beam 34, but rather a recess 54 for guiding the telescopic extension tube 46. Accordingly, each pair of longitudinal members 38, 39 has pivot arms 14, 14'; 15, 15' and pivot bearings 28, 28' lying along the axes of rotation 35, 36.The pivot arms 14, 14'; 15, 15' mounted on the chassis 44 via the pivot bearings 28, 28' form together with the longitudinal beams 33, 33'; 43, 43' of the carrier device 42 a parallelogram guide 50 schematically shown in FIGS. 22, 23 to 24, in which the movement sequence of each longitudinal beam 33, 33'; 43, 43' can also be transferred to the first embodiment of the carrier device (reference numeral 12).The parallelogram guide 50 of the carrier device 42 has the effect that all longitudinal carriers 33, 33'; 43, 43' of the two longitudinal carrier pairs 38, 39 arranged one behind the other, together with the telescopic extension tube 46, can be lowered from the rest position RP (Figs. 14, 15 and 22) by means of the working cylinders 19, 19' into the working position AP (Fig. 23) and can be displaced in the direction of the rear of the vehicle by an amount a. The maximum size of the amount a is defined by the length of the pivot arm 14, 14'; 15, 15'.As FIGS. 14, 15 and 22 show, the inwardly folded, spectacle-shaped flat frame 48 with inserted tow hitch 13 is arranged at the rear end 47 of the telescopic extension tube 46. In the rest position RP (FIGS. 14, 15 and 22 ), the carrier device 42 is pivoted in under the loading platform 41 (sliding plateau). In FIG. 14, only the front longitudinal beams 43, 43' of the pair 39 of longitudinal beams are visible.According to FIG. 23, the carrier device 42 displaced by the amount a carries the mentioned trailer coupling 13, which - projecting outwards - is mounted on the cross member 49 of the eyeglasses-shaped flat frame 48, which is still folded in, so that any desired trailer provided with drawbar can be coupled to the trailer coupling 13. The same configuration of the elements of the carrier device 42 in its working position AP can be seen from FIGS. 17, 19 and 25.According to FIGS. 18 and 24, the telescopic extension tube 46 is completely pulled out and the spectacle-shaped flat frame 48 is folded out, so that the wheels of the vehicle to be recovered can be accommodated in the troughs 53 thereof. For the retraction and extension of the telescopic extension tube 46, a long sliding cylinder 55 shown in FIG. 15 is used. FIG. 18 shows the possibility of removably mounting the trailer coupling 13 on a seat 56 located in the middle of the cross member 49, as required.In FIG. 20, the rear region of the motor vehicle 10' is shown with the telescopic extension tube 46 partially pulled out and with the eyeglasses-shaped flat frame 48 folded out, into which a trailer coupling 13, not shown, can likewise be detachably fastened. FIG. 20 shows the longitudinal beams 33, 33'; 43, 43' suspended one behind the other and the cross beams 34, 40.The motor vehicle 10 or 10' can simultaneously transport at least two vehicles, for example accident vehicles, namely one accident vehicle on the loading platform 11 or on the sliding plateau 41 and the other vehicle-drawing-on the spectacle frame 48.List of reference characters10, 10' Motor vehicle 11 loading platform 12 support device 13 trailer coupling 14, 14' pivot arm 15, 15' pivot arm 16 stop element 17 sensor device 18 proximity switches 19, 19' working cylinders 20 rear region 21 platform end 22 chassis 23 axis 24 lift axis 25 pivot axis (joint) 26 front part 27 rear part 28, 28' pivot bearing 29 free space 30 contact surface 31 loading ramp 32, 32 pivot bearing 33 longitudinal support 34 cross support 35 pivot axis 36 pivot axis 37 distance 38 longitudinal support pair 39 longitudinal support pair 40 cross support 41 loading platform 42 support device 43, 43' longitudinal support 44 chassis 45 end 46 telescopic extension tube 47 end 48 flat frame 49 cross support (v. 48) 50 parallelogram guide 51 base frame 52 guide frame 53 trough 54 recess 55 sliding cylinder 56 seat (v. 13) a amount FP travel position LP loading position AP working position RP resting position β angle

Claims

Motor vehicle (10; 10') designed as an articulated transporter - with a front part (26) and a rear part (27) coupled to the front part (26), wherein the front part (26) and the rear part (27) are coupled to one another via a pivot axis (25) lying perpendicular to the direction of travel - and with a loading platform (11; 41) arranged on a chassis (44), which is tiltable together with the rear part (27) from a travel position (FP) into a loading position (LP) about the pivot axis (25), characterized in that - the loading platform (11; 41) and / or the chassis (44) is coupled to a carrier device (12; 42) which is opposite the loading platform (11; 41) and / or the chassis (44) can be moved from an operating position (AP) into a rest position (RP), - at least one operating cylinder (19, 19') is provided for performing the change in position of the carrier device (12; 42) with respect to the loading platform (11; 41).Motor vehicle (10; 10') according to Claim 1, characterized in that the carrier device (12; 42) comprises at least one longitudinal member (33, 33'; 43, 43') arranged movably with respect to the loading platform (11; 41), - wherein at least one pivot bearing (32, 32') of a pivot arm (14, 14'; 15, 15') is introduced on the longitudinal member (33, 33'; 43, 43'), - and wherein the pivot arm (14, 14'; 15, 15') has, at its end (45) lying opposite the pivot bearing (32, 32'), a further pivot bearing (28, 28') for coupling to the chassis (44), such that the carrier device (12; 42) can be pivoted about the axis of rotation (35, 36) of the pivot bearing (28, 28') running perpendicular to the longitudinal orientation of the motor vehicle (10).Motor vehicle (10; 10') according to either of Claims 1 and 2, characterized in that two pairs of longitudinal members (38, 39) are provided and at least one pair of longitudinal members (38, 39) is provided, in which the longitudinal members (33, 33'; 43, 43') of each pair of longitudinal members (38, 39) are connected to one another via a cross member (34; 40).Motor vehicle (10, 10') according to Claim 3, characterized in that the pairs of longitudinal members (38, 39) are arranged in tandem along the carrier device (12, 42).Motor vehicle (10; 10') according to one of Claims 2 to 4, characterized in that the pivot arms (14, 14'; 15, 15') are of the same length and are constituent parts of at least one parallelogram guide (50), such that the carrier device (12; 42) can be pivoted with respect to the chassis (44) and / or the loading platform (11; 41) by means of at least one parallelogram guide (50).Motor vehicle (10; 10') according to one of Claims 2 to 5, characterized in that the pivot arm (14, 14'; 15, 15') is rotatable through an angle of more than 20°, preferably more than 60° and most preferably more than 90°, during the change from the working position (AP) into the rest position (RP).Motor vehicle (10') according to one of Claims 3 to 6, characterized in that the carrier device (42) carries a telescopic extension pipe (46) which is arranged between the longitudinal members (33, 33'; 43, 43') and at the end (47) of which pointing in the direction of the rear of the vehicle an extendable, spectacle-shaped flat frame (48) is arranged.Motor vehicle (10; 10') according to Claim 7, characterized in that the telescopic tube (46) is fixedly connected to the cross member (40) of the longitudinal member pair (39) and is arranged displaceably on the cross member (40) of the rear longitudinal member pair (38).Motor vehicle (10; 10') according to one of Claims 3 to 8, characterized in that a trailer coupling (13) is fixedly or releasably introduced on the crossmember (34) of the carrier device (12) or on a crossmember (49) of the spectacle-shaped flat frame (48).Motor vehicle (10; 10') according to one of the preceding claims, characterized in that at least one stop element (16), preferably made of resilient material, is provided on the carrier device (12; 42) and / or on the loading platform (11; 41) and / or between the carrier device (12; 42) and the loading platform (11; 41).Motor vehicle (10; 10') according to one of the preceding claims, characterized in that at least one sensor device (17) is provided for determining the position of the carrier device (12; 42) relative to the loading platform (11; 41) and / or the chassis (44).Motor vehicle (10; 10') according to Claim 11, characterized in that the sensor device (17) comprises a proximity switch (18), which is preferably attached to at least one working cylinder (19).Motor vehicle (10) according to one of the preceding claims, characterized in that a control device is provided, by means of which the sequence of the movements - loading platform (11; 41) is tilted from the travel position (FP) into the loading position (LP) and - carrier device (12; 42) is moved with respect to the loading platform (11; 41) from the working position (AP) into the rest position (RP) can be predefined, so that tilting of the loading platform (11; 41) can be carried out only when the carrier device (12; 42) is arranged in the rest position (RP).Method for operating a motor vehicle (10; 10') designed as a articulated transporter according to one of Claims 1 to 13, characterized in that - before the position of the loading platform (11; 41) is changed from the driving position (FP) into the loading position (LP), the carrier device (12; 42) is moved from an operating position (AP) into a rest position (RP), - wherein the loading platform (11; 41) is tilted about the pivot axis (25) coupling the front part (26) and the rear part (27) of the motor vehicle (10; 10') to one another.Method for operating a motor vehicle according to Claim 14, characterized in that, before the position change of the loading platform (11; 41) is started, the position of the carrier device (12; 42) relative to the loading platform (11; 41) is checked by means of a sensor device (17).Method for operating a motor vehicle according to Claim 15, characterized in that the sensor device (17) transmits a control command to a control device when the carrier device (12; 42) is in the rest position (RP) and / or in the working position (AP), as a function of which a release for the position change of the loading platform (11; 41) is issued, so that it is ensured that: - the loading platform can be moved from the driving position (FP) into the loading position (LP) only when the carrier device (12; 42) is in the rest position (RP) and / or - the carrier device (12; 42) can be moved from the rest position (RP) into the working position (AP) only when the loading platform (11; 41) is in the driving position (FP).

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