Tugger train trailer with a chassis and a transport device

Abstract

Tugger train trailer with a chassis (1) having two axle frames (2, 3) spaced apart from one another in the longitudinal direction of the vehicle, and a transport device (4) which can be brought into operative connection with transport units and which is designed to absorb forces generated by the transport units and connects the axle frames (2, 3) to one another in a force-transmitting manner, characterized in that the axle frames (2, 3) are each provided with a lifting mast profile (12 or 13) which forms a force-transmitting interface of the chassis (1) to the transport device (4) and consists of two vertical rails (12a, 12b or 13a, 13b) spaced apart from one another in the transverse direction of the vehicle, and in that the transport device (4) comprises a longitudinal member (5) and two webs (6, 7) which are angled relative to the longitudinal member (5), each of which adjoins one end of the longitudinal member (5) and has a coupling section (6a, 7a) which extends into the area between the vertical rails (12a, 12b or13a, 13b) of the lifting mast profile (12 or 13) of the adjacent axle frame (2, 3) and is connected to the lifting mast profile (12 or 13).

Description

[0001] The invention relates to a tugger train trailer with a chassis having two axle frames spaced apart from one another in the longitudinal direction of the vehicle, and a transport device which can be brought into operative connection with a transport unit, which is designed to absorb forces generated by the transport units and connects the axle frames to one another in a force-transmitting manner.

[0002] The invention further relates to a system for providing such tugger train trailers.

[0003] Tugger train trailers are used for internal material transport. Rollable transport units, such as rolling cages and pallet trucks, or other transport units, such as loads on standard pallets, are transported by tugger train trailers pulled by a tractor. Depending on the availability of rollers and the design of the tugger train trailer, the transport units can be pulled on their own rollers or carried in a raised position.

[0004] DE 10 2004 018 910 A1 discloses a tugger train trailer of this type, in which the transport device comprises a bridge-like supporting frame constructed similarly to a truss and consisting of a plurality of vertical, horizontal, and diagonal frame bars. This supporting frame is rigidly connected to a chassis consisting of a front and a rear running gear, each of which has an axle frame composed of profile bars in a lattice-like manner.

[0005] A lifting device is provided on the support frame of the transport device. This device has angled lifting plates mounted on the support frame, which are height-adjustable relative to the support frame. By raising the lifting plates, a transport unit designed as a trolley can be brought into operative connection with the transport device. The weight and inertial forces of the transport unit are transferred via the lifting plates into the support frame and from there into the front and rear chassis. Furthermore, tractive forces acting in the longitudinal direction of the tugger train trailer are transferred from the front chassis to the rear chassis via the transport device.

[0006] The company brochure "Hoesch Schwerter Profile GmbH: SCHWERTER SPECIAL PROFILES FOR THE MATERIAL HANDLING INDUSTRY. P. 3-14. 2013" and the publication "SCHEFFLER, M.; FEYRER, K.; MATTHIAS, K.: Material Handling Machines. Hoists, Elevators, Industrial Trucks. 1st Edition. Wiesbaden: Springer Fachmedien, 1998. Pages 382-385. -ISBN 978-3-663-16319-0" each disclose the construction of lifting masts and the use of standard profiles for their construction.

[0007] DE 10 2011 080 857 A1 discloses two other designs of tugger train trailers. In a first embodiment, a tugger train trailer has a chassis designed as an E-shaped frame. Wheels are attached to the horizontally transversely arranged front, rear, and middle webs of the chassis. On the longitudinal beam of the chassis is a lifting mast-like transport device, which is equipped with a load fork and is thus suitable for picking up a pallet or for lifting a pallet truck. According to a Fig. In the second embodiment of a tugger train trailer, shown in Figure 7 of the aforementioned publication, a shortened lifting mast is arranged on each of the two webs of a chassis, which - viewed from above - is designed as a C-shaped frame. An angle plate on the mast is vertically adjustable. Together, both lifting masts and the angle plates form the transport device on which a pallet or pallet truck can be picked up and lifted as a transport unit. These tugger train trailers are also vehicles specially adapted for transport units of specific dimensions.

[0008] The publication "GÜNTHNER, WA: Status and Development of Tugger Train Systems for Internal Material Transport. TU Munich, Chair of Materials Handling, Material Flow, and Logistics. 2012, pages 47, 53. - ISBN: 978-3-941702-30-01" discloses tugger train trailers of various designs, including those with a C-frame and a portal frame.

[0009] DE 10 2011 017 346 A1 discloses a tugger train trailer which is capable of lifting a pallet truck arranged in the area between the axle frames by means of transport devices provided on the axle frames. In the raised state, in which there is an operative connection between the transport device and the transport unit, the pallet truck connects the two axle frames to one another in a tractive force-transmitting manner. This makes it possible to avoid the need for a massive portal frame connecting the two axle frames and carrying loads. The tugger train trailer therefore only has a U-shaped arched element between the two axle frames which, when the tugger train trailer is in its transport state, i.e. when operating with transport units, does not have to absorb any tractive or weight forces. When the tugger train trailer is empty, the arched element serves as a connecting element between the two axle frames, thus forming a manageable vehicle.

[0010] The generic tugger train trailer is a structure designed exclusively for the transport of raised pallet trucks of a specific size. If other transport units are to be transported, such as pallets or rolling cages that are towed on their own wheels, where there is no lifting but only a pulling and / or pushing connection between the transport device and the transport unit, a specially equipped tugger train trailer is required.

[0011] The object of the present invention is to provide a functionally reliable, easy-to-use and easy-to-manufacture tugger train trailer of the type mentioned above, which is capable of accommodating transport units of various types with relatively little adaptation in view of more universal usability.

[0012] This object is achieved according to the invention in that the axle frames are each provided with a lifting mast profile which forms a force-transmitting interface of the chassis to the transport device and consists of two vertical rails spaced apart from one another in the transverse direction of the vehicle, and in that the transport device has a longitudinal member and two webs angled thereto, which each connect to one end of the longitudinal member and have a coupling section which projects into the area between the vertical rails of the lifting mast profile of the adjacent axle frame and is connected to the lifting mast profile.

[0013] The essential idea of ​​the invention is therefore to assemble the tugger train trailer essentially from three main assemblies: two axle frames forming a chassis and equipped with force-transmitting interfaces to the transport device, and a transport device intended for operative connection to the transport unit. This allows each main assembly to be optimally designed for its function. It is thus possible to manufacture tugger train trailers for a wide variety of transport units by using a specific transport device without significantly impacting the other two main assemblies, i.e., the axle frames of the chassis.

[0014] The transport devices can be manufactured in different dimensions, e.g. suitable for holding a Euro pallet, a half Euro pallet, a double Euro pallet or a non-standardised transport unit manufactured according to customer requirements.

[0015] Overall, despite relatively few components and with little effort and therefore low costs, a wide variety of tugger train trailers is possible, with which a wide variety of transport tasks can be solved.

[0016] The transport device can advantageously be height-adjustable compared to the chassis. This allows, for example, pallets or pallet trucks to be transported in a raised position. However, for simply towing rollable transport units, such as rolling cages, no lifting device is required, and, as will be described later, a transport device adapted to the transport of such transport units can be used.

[0017] In conjunction with a height-adjustable transport device, the coupling sections of the transport device to the chassis are advantageously guided by rollers in the lifting mast profiles of the axle frames. Thus, the guide elements of the lifting device are integrated into the interface between the chassis and the transport device. The rollers used are the support rollers commonly found in lifting mast profiles.

[0018] Furthermore, a lifting unit of a lifting device can be arranged in the area of ​​each coupling section of the transport device. Thus, the drive of the lifting device is also integrated into the interface between the chassis and the lifting device. Electric (e.g., threaded spindles) or electro-hydraulic lifting drives are preferred as lifting units.

[0019] By using multiple lifting units, the lifting capacity of the lifting device can be varied, and in combination with longer vertical rails of the mast profiles, different lifting heights can be achieved, e.g. for an off-road version of the tugger train trailer.

[0020] According to an advantageous embodiment, the raising and lowering of the transport device can be controlled in a simple manner if a foot-operated lifting switch of a lifting device is arranged on at least one of the axle frames.

[0021] In a preferred embodiment of the tugger train trailer according to the invention, the transport device—as seen in plan view—is designed as a C-frame with a longitudinal beam and two cross members. In this embodiment of the tugger train trailer according to the invention, with a flat frame (C-frame) open on one side, transport units can be inserted into the transport device from the side.

[0022] If a support rail is arranged on the inside of each of the crossbars of the C-frame, which are preferably arranged at right angles to the longitudinal member, a pallet can be lifted and transported in conjunction with a lifting device that lifts the transport device vertically relative to the axle frame, the width of which corresponds to the inside distance between the two webs.

[0023] To achieve greater variability, the support rail can be attached to the crossbars in at least two different height positions.

[0024] The possibilities for accommodating transport units of different types and dimensions are further improved if at least one fork can be attached to the longitudinal member of the C-frame.

[0025] For the aforementioned transport of rollable transport units, a second embodiment of a tugger train trailer according to the invention proves to be advantageous, in which the transport device - seen in side view - is designed as a bow-shaped bridge frame with a longitudinal beam and two vertical webs.

[0026] The transport device with bridge frames can be equipped with or without a lifting device. In the latter case, with regard to a pulling and / or pushing connection between the transport device and the rollable unit(s), it is advantageous if a locking bracket is arranged on both sides of the bridge frame. In the closed position, this locking bracket laterally delimits the free space between the axle frames. This locking bracket is attached to one of the axle frames and can be pivoted about a horizontal transverse axis from the closed position upwards to an open position. One or more rollable transport units are enclosed and guided horizontally in the space delimited by the locking brackets and the vertical webs.

[0027] In this context, the locking brackets are advantageously in engagement with the axle frame in the closed position, transmitting tensile and compressive forces.

[0028] This can preferably and advantageously be achieved by coupling the locking brackets to the associated axle frame at the upwardly pivoting end using a ball-and-socket coupling. Standard ball-and-socket couplings, such as those known and proven in the automotive sector, can be used for this purpose.

[0029] In terms of rationalization effects in production, it proves advantageous if the axle frames are designed as at least partially identical modules. With only minor adjustments, the axle frames can be used as both the front and rear axle frames of the tugger train trailer, thus requiring only one basic axle frame module.

[0030] If a drawbar can be attached to each axle frame, the one-sided accessible opening of the tugger train trailer with a flat C-frame can be positioned on the right or left, relative to the direction of travel of the tugger train trailer. This eliminates the need to provide special right- and left-hand versions of the tugger train trailer.

[0031] Similarly, it is advantageous in this context if a ball head of a ball head coupling can be attached to both axle frames

[0032] The axle frames are conveniently designed to be optionally equipped with steerable, rigid or freely pivoting wheels, which can also be spring-mounted.

[0033] In this case, at least one axle frame can advantageously be provided with wheels which can be steered by a steering device which has one or more traction means for mechanically coupling the steerable wheels to one another.

[0034] The steering device may have one or more traction means for mechanically coupling the steerable wheels to a pivoting drawbar mount.

[0035] The steering device can also have traction-coupled cam discs, in particular elliptical sprockets, whose rotational position determines the steering position of the steerable wheels. Cam discs of different shapes and diameters are used to adapt the steering to tugger train trailers of different dimensions.

[0036] In a version of the tugger train trailer with four-wheel steering, both axle frames are expediently provided with steerable wheels and with a steering device, wherein the steering devices of the two axle frames are mechanically coupled to one another by a traction means, in particular a steel cable, which is arranged on or in the longitudinal member of the transport device.

[0037] Alternatively, it is also possible for both axle frames to be provided with steerable wheels and a steering device, wherein the steering device of the second axle frame has an electric drive which can be controlled in accordance with a sensor which detects the steering position of the steering device of the first axle frame.

[0038] The object underlying the invention is also achieved by a system for providing tugger train trailers from axle frames, each of which is provided with a lifting mast profile which forms a force-transmitting interface of the chassis to the transport device and consists of two vertical rails spaced apart from one another in the transverse direction of the vehicle, transport devices which - seen in plan view - are designed as a C-frame with a longitudinal member and two transverse webs, transport devices which - seen in side view - are designed as a bow-shaped bridge frame with a longitudinal member and two vertical webs, wheels, steering devices for axle frames, lifting units for arrangement in the region of coupling sections of the transport devices as well as with drawbars and ball heads.

[0039] This enables modular and therefore efficient production of tugger train trailers of various designs, whereby individual adaptation to different application requirements is possible with just a few elements and assemblies.

[0040] Further advantages and details of the invention are explained in more detail with reference to the exemplary embodiments shown in the schematic figures. Fig. 1 a plan view of a tugger train trailer according to the invention with a C-frame, Fig. 2 a perspective view of the tugger train trailer according to Fig. 1 from the front, Fig. 3 a perspective view of the tugger train trailer according to Fig. 1 from the back, Fig. 4 a perspective view of a tugger train trailer according to the invention with a bow-shaped bridge frame, Fig. 5 a schematic diagram of a two-wheel steering system of the tugger train trailer and Fig. 6 a schematic diagram of a four-wheel steering system of the tugger train trailer.

[0041] The tugger train trailers shown in the figures comprise a chassis 1 consisting of two axle frames 2, 3, and a transport device 4 connecting the axle frames 2, 3 to one another, which has a longitudinal member 5 and two webs 6, 7 which are in particular at right angles thereto.

[0042] In the embodiment according to the Fig. 1 to 3 is the transport device 4 - seen in plan view (see Fig. 1) is designed as a C-frame ("flat frame"), with the two webs 6, 7 each designed as cross webs 8 and 9, respectively. The longitudinal member 5 can also be referred to as the "back tube."

[0043] Both axle frames 2, 3 are at least partially designed as identical modules. They can be mirror-imaged and equipped with attachment points for wheels R as well as a drawbar D and a ball head K. Depending on the application, the wheels R can be steerable, rigid, or freely pivoting. Furthermore, it is also possible to provide sprung wheels R. As can be seen in particular from Fig. 1, in the present embodiment the two axle frames 2, 3 are essentially identical in construction - apart from different dimensions in the longitudinal direction of the vehicle.

[0044] The drawbar D is attached to the front axle frame 3 (in the direction of travel), and the ball head K is attached to the rear axle frame 2, allowing another tugger train trailer to be connected to the tugger train. Because the drawbar D and ball head K can be attached to each of the axle frames 2 and 3, variants of the tugger train trailer with a side opening accessible from the right or left (in the direction of travel) for the transport units can be created with minimal effort. No modifications to the drawbar D itself are required.

[0045] To connect the transport device 4 to the axle frames 2, 3 forming the chassis 1, these are each provided with a lifting mast profile 12 or 13. Both lifting mast profiles 12, 13 each comprise two vertical rails 12a, 12b and 13a, 13b spaced apart from one another in the transverse direction of the vehicle. The webs 6, 7 (which are transverse webs 8, 9 of the C-frame) arranged at each end of the longitudinal member 5 of the transport device 4 are connected to the adjacent axle frame 2 or 3 via a coupling section 6a or 7a, which projects into the area between the vertical rails 12a and 12b or 13a and 13b of the lifting mast profile 12 or 13. The lifting mast profiles 12, 13 form interfaces between the chassis 1 and the transport device.

[0046] The transport units to be transported by means of a tugger train trailer are brought into operative connection with the transport device 4 by lifting the transport units. In order to be able to raise the transport device 4 relative to the chassis 1, a lifting device is provided, for example, which has a lifting unit H (not shown in detail in the figures) within each coupling section 6a or 7a, which is guided vertically by support rollers T in the mast profile 12 or 13 (only the support area on the axle frames 2, 3 is visible). The lifting units H are preferably each designed as an electric threaded spindle or electro-hydraulic driven lifting cylinder and are attached to the coupling section 6a or 7a, but are supported vertically on the associated axle frame 2 or 3.The extendable element of each lifting unit H can extend downward, whereby the transport device 4 moves upward due to the support on the axle frames 2, 3 and the attachment of the base part of the lifting unit H to the coupling section 6a or 7a. The guide and drive components of the lifting device are thus integrated into the interfaces between the chassis 1 and the transport device 4.

[0047] To lift transport units, a support rail 14 or 15 is attached, particularly screwed, to the inside of each crosspiece 8 or 9, which can also be referred to as a "lifting lip." Using appropriate hole patterns, this rail can be mounted at various heights. For example, a standard-sized trolley can be lifted using the two support rails 14 and 15. To facilitate positioning of the trolley when inserting it into the transport device 4, the crosspieces 8 and 9 are each provided with a guide bevel 6b and 7b, respectively.

[0048] Additionally, at least one fork 16 (two forks 16 are shown in the present embodiment) can be attached to the longitudinal beam 5 of the transport device 4. This makes it possible to lift a rolling frame with smaller dimensions than a standard-sized trolley. To prevent the rolling frame or the transport unit from slipping off the fork tine(s) 16, a mechanical lock 16a that can be released with the foot can be provided on the at least one fork tine 16. The fork tine 16 can be fixed in various positions by means of a toothing 16b attached to the underside of the longitudinal beam and corresponding counter-toothing (not shown) of the fork tine 16.

[0049] The lifting device can be activated by a foot-operated lift switch 17 located on one of the two axle frames 2 or 3, preferably in the area of ​​the adjacent insertion bevels 6b or 7b. Of course, it is also possible to install a lift switch 17 on each axle frame 2, 3.

[0050] In the embodiment according to Fig. 4, the transport device 4 is designed as a bow-shaped bridge frame (“U-frame”) when viewed from the side. Here, the two webs 6, 7 each form a vertical web 10 or 11. The longitudinal member 5, to whose ends the vertical webs 10 or 11 are connected, is arranged in the longitudinal center plane of the vehicle. This allows transport units to be brought into the free space under the bridge frame from both sides and towed either in a raised state or if they have their own rolling capability, as is the case with rolling grid boxes, for example. In any case, just as when using the C-frame according to the Fig. 1 to 3 - forces are generated by the transport units, which are introduced into the transport device 4 and transferred to the axle frames 2, 3 of the chassis 1.

[0051] Particularly in the case of a pulling / pushing connection between the transport units and the transport device 4, a locking bracket 18 or 19 is arranged on both sides of the bridge frame, which laterally delimits the free space between the axle frames 2, 3 in the closed position. Each locking bracket 18 or 19 is attached to one of the axle frames 2 or 3 so as to be pivotable about a horizontal transverse axis from the closed position upwards into an open position. In the space delimited by the locking brackets 18, 19 and the vertical webs 10, 11, rollable transport units that do not need to be lifted can be horizontally enclosed and guided. Transport units that do not have their own rollers can be lifted with a lifting device (shown in the figure) when the transport device 4 is designed.

[0052] Forces can also be transmitted to the axle frames 2, 3 via the locking brackets 18, 19. For this purpose, the locking brackets 18, 19 can be coupled to the associated axle frame 2 or 3 at the upwardly pivoting end by means of a ball-head coupling 20, 21, as shown in Fig. 4. Standard ball head couplings or components thereof, as known in the automotive sector, are preferably used.

[0053] The connection of the transport device 4 to the chassis 1 is carried out in the manner already described in connection with the embodiment according to the Fig. 1 to 3, ie by interfaces in the form of lifting mast profiles 12, 13 on the axle frames 2, 3, which are in operative connection with coupling sections 6a, 7a at the lower ends of the webs 6, 7 of the transport device 4, which are designed here as vertical webs 10, 11.

[0054] The Fig. 5 and Fig. 6 illustrate options for steering the tugger train trailer. The elements required for steering are shown in spatial arrangement, but separated from the main components (chassis 1, transport device 4) of the tugger train trailer shown in the previous figures.

[0055] When executed according to Fig. 5, the tugger train trailer is provided with a steering system on the front axle frame 3 in the direction of travel. The wheels R are not steerable and can be rigidly attached to the rear axle frame 2 in the direction of travel. The front wheels R are each rotatably mounted about a vertical axis and can be steered by a steering device L, which has a plurality of traction means Z for mechanically coupling the steerable wheels R to one another and to a drawbar mount DA. The traction means Z can be designed as chains, as shown. The rotational position of the wheels R relative to one another and to the position of the drawbar mount DA is determined by cam discs S in the form of elliptical chain wheels, which are coupled to the traction means Z.

[0056] In a version of the tugger train with four-wheel steering, as shown in Fig. As shown in Figure 6, both axle frames 2, 3 are expediently provided with steerable wheels R and a steering device L1 and L2, respectively. The steering devices L1, L2 are mechanically coupled to one another by a traction means ZS, in particular a steel cable. This is preferably arranged on or in the longitudinal beam 5 of the transport device 4 (not shown) and thus protected from damage and other external influences.

[0057] As an alternative to a mechanical coupling of the two steering devices L1, L2 by a traction device ZS, it is also possible for the steering device L2 of the second axle frame (rear steering device) to have an electric drive that can be controlled according to a sensor that detects the steering position of the steering device L1 of the first axle frame (front steering device). This solution is particularly suitable for the Fig.4 illustrated embodiment of the tugger train trailer with a transport device 4 in the form of a bow-shaped bridge frame is preferred.

[0058] Unsteered versions of the tugger train trailer are also possible, in which case, for example, two swivel wheels R (“swivel castors”) can be attached to the front axle frame 3 in the direction of travel and two rigid wheels R (“fixed castors”) can be attached to the rear axle frame 2 in the direction of travel.

Claims

[1] Tugger train trailer with a chassis (1) having two axle frames (2, 3) spaced apart from one another in the longitudinal direction of the vehicle, and a transport device (4) which can be brought into operative connection with transport units and which is designed to absorb forces generated by the transport units and connects the axle frames (2, 3) to one another in a force-transmitting manner, characterized byin that the axle frames (2, 3) are each provided with a lifting mast profile (12 or 13) which forms a force-transmitting interface of the chassis (1) to the transport device (4) and consists of two vertical rails (12a, 12b or 13a, 13b) spaced apart from one another in the transverse direction of the vehicle, and in that the transport device (4) comprises a longitudinal member (5) and two webs (6, 7) which are angled relative to the longitudinal member (5) and which each adjoin one end of the longitudinal member (5) and have a coupling section (6a, 7a) which projects into the area between the vertical rails (12a, 12b or 13a, 13b) of the lifting mast profile (12 or 13) of the adjacent axle frame (2, 3) and is connected to the lifting mast profile (12 or 13). [2] Tugger train trailer according to claim 1, characterized by that the transport device (4) is vertically movable relative to the chassis (1). [3] Tugger train trailer according to claim 2, characterized bythat the coupling sections (6a, 7a) of the transport device (4) are guided by means of rollers in the lifting mast profiles (12, 13) of the axle frames (2, 3). [4] Tugger train trailer according to claim 3, characterized by that a lifting unit (H) of a lifting device is arranged in the region of the coupling sections (6a, 7b) of the transport device (4). [5] Tugger train trailer according to one of claims 2 to 4, characterized by that a foot-operated lifting switch (17) of a lifting device is arranged on at least one of the axle frames (2 or 3). [6] Tugger train trailer according to one of claims 1 to 5, characterized by that the transport device (4) - seen in plan view - is designed as a C-frame with a longitudinal member (5) and two transverse webs (8, 9). [7] Tugger train trailer according to one of claims 2 to 5 and claim 6, characterized bythat a support rail (14 or 15) is arranged on the inside of the crossbars (8, 9) of the C-frame. [8] Tugger train trailer according to claim 7, characterized by that the support rails (14, 15) can be fastened to the crossbars (8, 9) in at least two different height positions. [9] Tugger train trailer according to one of claims 6 to 8, characterized by that at least one fork (16) can be fastened to the longitudinal member (5) of the C-frame. [10] Tugger train trailer according to one of claims 1 to 5, characterized by that the transport device (4) - seen in side view - is designed as a bow-shaped bridge frame with a longitudinal beam (5) and two vertical webs (10, 11). [11] Tugger train trailer according to claim 10, characterized bythat on both sides of the bridge frame there is arranged a locking bracket (18, 19) which laterally delimits the free space between the axle frames (2, 3) in the closed position and which is fastened to one of the axle frames (2 or 3) so as to be pivotable about a horizontal transverse axis from the closed position upwards into an open position. [12] Tugger train trailer according to claim 11, characterized by that the locking brackets (18, 19) in the closed position are in engagement with the axle frames (2, 3) transmitting tensile and compressive forces. [13] Tugger train trailer according to claim 11 or 12, characterized by that the locking brackets (18, 19) can each be coupled to the associated axle frame (2 or 3) at the upwardly pivotable end by means of a ball head coupling (20, 21). [14] Tugger train trailer according to one of claims 1 to 13, characterized by that the axle frames (2, 3) are designed as at least partially identical modules. [15] Tugger train trailer according to one of claims 1 to 14, characterized by that a drawbar (D) can be attached to each of the two axle frames (2, 3). [16] Tugger train trailer according to one of claims 1 to 15, characterized by that a ball head (K) of a ball head coupling can be fastened to each of the two axle frames (2, 3). [17] Tugger train trailer according to one of claims 1 to 16, characterized in that the axle frames (2, 3) are designed to be optionally equipped with steerable, rigid or freely pivoting wheels (R). [18] Tugger train trailer according to claim 17, characterized by that at least one axle frame (2 or 3) is provided with wheels (R) which are steerable by a steering device (L) which has one or more traction means (Z) for mechanically coupling the steerable wheels (R) to one another. [19] Tugger train trailer according to claim 18, characterized in that the steering device (L) has one or more traction means (Z) for mechanically coupling the steerable wheels (R) to a pivotable drawbar receptacle (DA). [20] Tugger train trailer according to claim 18 or 19, characterized by that the steering device (L) has cam discs (S) coupled by means of traction, in particular elliptical chain wheels, the rotational position of which determines the steering position of the steerable wheels (R). [21] Tugger train trailer according to one of claims 17 to 20, characterized by that both axle frames (2, 3) are each provided with steerable wheels (R) and with a steering device (L1 or L2), wherein the steering devices (L1, L2) of the two axle frames (2, 3) are mechanically coupled to one another by a traction means (ZS), in particular a steel cable, which is arranged on or in the longitudinal member (5) of the transport device (4). [22] Tugger train trailer according to one of claims 17 to 20, characterized by that both axle frames (2, 3) are each provided with steerable wheels (R) and with a steering device (L1, L2), wherein the steering device (L2) of the second axle frame (2) has an electric drive which can be controlled in accordance with a sensor which detects the steering position of the steering device (L1) of the first axle frame (3). [23] System for providing tugger train trailers according to one of claims 1 to 22 comprising axle frames (2, 3), each provided with a lifting mast profile (12, 13) which forms a force-transmitting interface of the chassis (1) to the transport device (4) and consists of two vertical rails (12a, 12b and 13a, 13b) spaced apart from one another in the transverse direction of the vehicle, transport devices (4) which - seen in plan view - are designed as C-frames with a longitudinal member (5) and two transverse webs (8, 9), transport devices (4) which - seen in side view - are designed as a bow-shaped bridge frame with a longitudinal member (5) and two vertical webs (10, 11), wheels (R), steering devices (L, L1, L2) for axle frames (2, 3), lifting units (H) for arrangement in the region of coupling sections (6a, 7a) of the Transport devices (4) as well as drawbars (D) and ball heads (K).

Images