Load-bearing device with variable capacity, and cargo bike equipped with it

Abstract

Load-bearing device (1) for a cargo bicycle (10), in particular for a cargo bicycle (10) in long-john design, with a base part (2) and with a wall (3) adjoining the base part (2) such that the base part (2) and wall (3) define a load-bearing space (LA), characterized by that the bottom part (2) has a first and a second bottom telescopic section (20a, 20b) and the wall (3) has a first and a second wall telescope section (30a, 30b), wherein the first bottom telescopic section (20a) optionally extends the bottom part (2) and the first wall telescopic section (30a) extends the wall (3) in a first extension direction (EW1), and wherein the second bottom telescopic section (20b) selectively extends the bottom part (2) and the second wall telescopic section (30b) extends the wall (3) in a second extension direction (EW2) opposite to the first, preferably opposite, direction of extension, such that the load-bearing space (LA) is increased by expanding it, and wherein a number of power transmission units (4) connect the first to the second bottom telescopic section (20a, 20b) and / or the first to the second wall telescopic section (30a, 30b).

Description

[0001] The invention relates to a load-bearing device according to the features of claim 1.

[0002] Cargo bikes are well-known in practice and are currently receiving increasing consideration as logistical transport vehicles, which are particularly flexible and environmentally friendly in urban areas and therefore have an advantage over conventional vehicles.

[0003] Known cargo bikes are designed for transporting both objects and people, especially children, or animals. In the context of the invention, the term "load" is used to represent the aforementioned objects, people, and animals. Such cargo bikes expediently include a load-carrying device with which one or more loads can be transported.

[0004] Load-bearing devices are known in practice, for example in many different variations under names such as container, crate, box or the like. Essentially, these consist of a base section and a wall, with the base section and wall defining a load-bearing space. The wall can run circumferentially around the base section or be arranged only in sections. Furthermore, the wall can have different heights and thicknesses. Holding devices, in particular straps or similar, or seat shells, in particular special child seat shells, serve to secure the loads during transport. A hood, lid, canopy or similar can be used to provide an essentially rain and / or windproof cover for the load-bearing space. Generally, the base section and wall are supported by a frame of the cargo bike, with either the frame or the base section forming the lowest point.

[0005] Cargo bikes are increasingly subject to multifunctional requirements. For example, there is an expectation of being able to transport loads of different sizes without sacrificing the cargo bike's compact design or having to resort to transport vehicles of different sizes. Instead, there is a desire for a transformable basic concept that allows the cargo bike to be flexibly adapted to the load to be transported.

[0006] In practice, the load-bearing capacity is increased, for example, by means of a so-called extension frame, with which an existing wall can be selectively, i.e., reversibly, extended. Foldable load-bearing devices are also known. For example, DE 20 2018 001 016 U1 describes a variable-size transport container with foldable side walls.

[0007] All known designs share the problem of being, in some cases, very cumbersome to handle. Furthermore, the known load-bearing devices are either unusable or only usable to a limited extent in a so-called initial position, in which the load-bearing device forms a minimal load-bearing space. Unrestricted usability, on the other hand, is only possible when the load-bearing device has assumed an extended configuration, i.e., when the wall is fully unfolded and a load-bearing space that is maximally enlarged compared to the initial position is formed.

[0008] Against this background, one object of the present invention is to provide an easy-to-use load-handling device. Furthermore, the invention is based on the object of creating a load-handling device that can be used in as many configurations as possible without restrictions. Finally, the aim is to provide a transport vehicle that can be used as flexibly as possible.

[0009] The problem is solved by a load-bearing device according to the features of claim 1 and by a cargo bike according to claim 23. Further advantageous aspects, details and embodiments of the invention will become apparent from the dependent claims and the description.

[0010] According to a first aspect, a load-bearing device for a cargo bike is proposed, in particular for a cargo bike of long-john design, comprising a base and a wall adjoining the base, such that the base and wall define a load-bearing space, wherein the base has a first and a second telescopic base section and the wall has a first and a second telescopic wall section, wherein the first telescopic base section selectively extends the base and the first telescopic wall section selectively extends the wall in a first extension direction, and wherein the second telescopic base section selectively extends the base and the second telescopic wall section selectively extends the wall in a second extension direction, preferably opposite to the first, such that the load-bearing space is enlarged by the extension.and wherein a number of power transmission units connect the first to the second bottom telescopic section and / or the first to the second wall telescopic section.

[0011] In the context of the invention, the term number can refer to a singular or a plural feature.

[0012] In other words, the proposed load-bearing device comprises a wall and a base section, each of which can be extended from a basic position to an extended position, and vice versa. In the extended position, the load-bearing area, and preferably also the base area of ​​the load-bearing device, is larger than in the basic position. The use of telescopic sections allows for unrestricted use of the load-bearing area, as any extension components or assemblies do not impede its use, since they slide into or out of each other. Furthermore, an extension can be performed independently of the components supporting the load-bearing device. For example, it is not necessary for a vehicle frame, such as the frame of a cargo bike, to be extendable itself.Instead, it can preferably be designed to be substantially rigid, so that a substantially torsion-resistant construction can be maintained.

[0013] In one embodiment, a wall and / or base section can be extended in one direction using multiple telescopic sections. Multiple telescopic sections are advantageous for providing maximum extension while simultaneously ensuring the smallest possible load-bearing space in the initial position. A small load-bearing space in the initial position can simplify handling in urban areas, for example, by requiring less parking space.

[0014] Furthermore, the proposal includes a number of force transmission units, each connecting the first telescopic sections to the second. This force-transmitting connection significantly simplifies handling, as expansion in a first direction preferably results in a synchronous expansion in a second direction. For example, if an operator pulls the first wall telescopic section and / or the first floor telescopic section in a first expansion direction, the force transmission element transfers this pulling force to the second wall telescopic section and pushes it in the second expansion direction, with the first and second expansion directions preferably being in opposite directions. This creates a flexible and easy-to-handle load-bearing device.

[0015] In one embodiment, it can be provided that at least one force transmission unit is designed as a scissor joint, wherein preferably in the first and second floor telescopic section and / or in the first and second wall telescopic section a link guide is formed, in which the scissor joint is guided.

[0016] A scissor joint provides a particularly efficient power transmission, allowing the first and second telescopic sections to be moved as synchronously as possible, without requiring simultaneous operation of both sections. Scissor joints are commonly used in lifting platforms, cranes, work platforms, trailer platforms, lifts, and laboratory lifting platforms to raise or lower a level. In this case, however, a primarily horizontal movement is intended, thus representing a different application.

[0017] According to a further development, it can be provided that the scissor joint has at least one sliding part which is slidably mounted in the cam guide and / or that the scissor joint has at least one roller which is rollingly mounted in the cam guide.

[0018] In a preferred slotted guide, a number of sliding parts and rollers can be mounted and guided along them to ensure a directed movement of the telescopic sections. For example, (cylindrical) pins and the associated plain bearing bushings can be provided, which reduce friction and ensure precise, uninterrupted movement. This ensures that only a minimum of force is required by the operator to move the telescopic sections. They also counteract tilting, so that trouble-free handling is possible through smooth gliding. The slotted guide therefore pursues the goal of first transferring the forces transmitted by means of the force transmission element from one telescopic section into the force transmission element as homogeneously and smoothly as possible, and then transferring this force from the force transmission element into another telescopic section as efficiently as possible.

[0019] Furthermore, it may be provided that a firing guide is designed which guides the first and second bottom telescopic shot and / or the first and second wall telescopic shot along an extension direction.

[0020] In addition to or as an alternative to the cam guide, a shot guide can be used to guide a number of telescopic sections along an expansion direction. Preferably, several guides can guide a first and a second telescopic section for a uniform and directed expansion of the wall or base section.

[0021] According to one embodiment, the shot guide may have a sliding carriage which is slidably mounted in a guide rail and / or the shot guide may have a guide roller which rolls on a guide track.

[0022] A particularly simple, yet no less efficient, design can consist of a number of guide rails forming the shot guide. Advantageously, the first and second telescopic shots can be mounted on a common guide rail, supporting synchronous and directed movement of the telescopic shots. Slides, especially sliding slides, and / or a number of rollers can be mounted along the multiple guide rails.

[0023] Furthermore, it can be provided that a central axis of the load-bearing device is aligned in the direction of travel of the cargo bike, preferably parallel to the direction of travel, with the first and second extension directions preferably being perpendicular to the central axis.

[0024] Preferably, the load-bearing device can be designed to be essentially mirror-symmetrical, so that a central axis, in particular a mirror axis, can be essentially horizontal and aligned in the direction of travel of the cargo bike. Preferably, the actuation of one telescopic section causes the other telescopic section, connected by means of a force transmission element, to force a uniform expansion of the load-bearing area. Particularly in the case of single-track vehicles, such as a cargo bike, this prevents a detrimental off-center shift of the center of gravity. Preferably, the first and second expansion directions can be aligned perpendicular to the central axis, so that a uniform expansion to the left and right in the direction of travel can occur.

[0025] In one embodiment, the wall may comprise a front wall at the front in the direction of travel and a rear wall opposite the front wall, preferably with the front wall and rear wall each having a first and a second wall telescopic section.

[0026] A front and / or rear wall is particularly advantageous because it can significantly contribute to load securing, especially during acceleration and deceleration of the load-handling device. Furthermore, it can prevent the load from becoming soiled during transport. The front and rear walls can be of different sizes or essentially the same size. It is particularly preferred that the front and rear walls are essentially identical, for example, in a modular design, so that the same components can be used for both the front and rear walls. In the context of the invention, this design is referred to as the "common parts principle." Such components can make the manufacturing process more flexible and reduce production costs.

[0027] It can be provided that the wall has a force transmission unit, in particular the front wall and / or the rear wall has a force transmission unit.

[0028] For ease of use, a force transmission unit can be arranged in or on the wall. In particular, the front and / or rear wall can have several force transmission units. These typically serve as the point of contact for the user, so that advantageously no further operating devices are required.

[0029] In a further development, it can be provided that the front wall and the rear wall delimit a load-bearing space which is extended from the bottom to the top, starting from the base part.

[0030] Particularly preferably, the wall can be adapted to the design of the structure supporting the load-bearing device, in particular a frame structure of a cargo bike, by, for example, at least partially covering and / or covering the generally smaller front wheel of a cargo bike with a long-john design. As a result, the load-bearing space can be increased.

[0031] According to a further development, it can be provided that the base part, the front wall and / or the rear wall each comprise a support plate and a cover plate, with the telescopic sections and the power transmission unit being arranged between the support plate and the cover plate.

[0032] The design of a carrier plate initially allows for the mounting of essential components or assemblies. For example, the carrier plate can have a number of guide rails along which telescopic sections are guided. Furthermore, a pivot base can be arranged for mounting a force transmission unit, in particular a scissor joint. Raised sections can serve as stops and limit the travel of a number of telescopic sections. Either essentially monolithically with the carrier plate or as a separate component, a number of edge sections can connect the carrier plate to a cover plate. For a monolithic design, the carrier plate can preferably be milled from a solid material.The top plate is held in place in such a way that a joint space, or joint space, is created between the support plate and the top plate. This joint space serves to accommodate the aforementioned components, in particular the arrangement of the telescopic sections and / or the power transmission unit. The described design is particularly simple and cost-effective to manufacture and is also suitable for enabling a modular system, if desired. The base and / or wall, especially the front and / or rear wall, can include a support plate and a top plate.

[0033] Advantageously, it can be provided that the carrier plate has the guide rail and / or the guide track.

[0034] If one or more guide rails are provided, these can advantageously be arranged in the previously described joint space on the support plate, and carriages that slide and / or roll on a guide rail, for example, can be arranged on the telescopic sections. This measure enables a particularly low-maintenance design, as the movement-relevant elements are not exposed to direct contamination, but are instead largely protected from external influences in the joint space. Furthermore, a more elegant appearance is supported by largely concealing technical components in the joint space from the visual impression of the operator.

[0035] According to one embodiment, it can be provided that the wall comprises at least one side wall which is aligned substantially parallel to the central axis, wherein the side wall is preferably connected to the front wall and to the rear wall.

[0036] The wall can be particularly advantageously designed as a wall that essentially circumferentially surrounds the base. For example, a number of side walls can be provided for this purpose, in particular two side walls aligned essentially parallel to the central axis, in combination with a front wall and / or a rear wall. The side wall, front wall, and rear wall can form an essentially enclosed container, which is preferably suitable for accommodating persons, such as small children, or the like, for whom all-round protection is required during transport.

[0037] Furthermore, it may be provided that the side wall is connected to the base in a force-transmitting manner.

[0038] To ensure the most enclosed load-handling device possible, several side walls can be connected to the base section to prevent moisture or contaminants from entering the load-handling area. This can also prevent transported goods or a load from accidentally escaping from the load-handling area and causing damage or injury.

[0039] Preferably, at least one side wall may have an entry opening and / or a step opening.

[0040] A high wall is advantageous because, firstly, it increases the load-bearing space and, secondly, it provides greater protection for the load. However, it can make it more difficult for people to get in, particularly if there are a number of high side walls. For this reason, an entry opening can be provided which extends upwards from the floor section and advantageously ends in the upper edge of a wall. The resulting reduced entry height can make it easier for children in particular to get into the load-bearing space. Alternatively or additionally, a number of step openings can be provided which are arranged in the wall and / or border on the wall and / or are arranged next to the wall, which serve as an entry aid to make it easier to use or reach a higher wall and / or a higher-lying entry opening.It is particularly advantageous to have a step opening below the floor section, so that no contaminants adhering to a shoe can enter the load-bearing area through the step opening.

[0041] Further training may include the design of a movable door leaf with which the entry opening can be optionally closed.

[0042] A door leaf, preferably pivotally connected to the wall, can be advantageously used to selectively close an access opening, for example, during transport, so that people are essentially protected during transport, while at the same time, in principle, simplified entry and exit are still possible. Preferably, a number of hinges pivotally connect a door leaf to a wall. Alternatively, a door leaf can be slidably held relative to the wall, for example, by being held in a number of guides. For this purpose, the door leaf can be designed such that it is slidable within the wall. A multi-part door leaf is advantageous in that a first part is slidable or pivotable in a first direction, and a second part is slidable or pivotable in a second direction.As a further measure to increase operational safety, a door leaf lock can be provided, which prevents unintentional opening, for example while driving.

[0043] According to one embodiment, a ramp can be provided which opens optionally into or adjacent to the entry opening.

[0044] A ramp or similar device can lead into the previously described entry opening, which can be arranged as desired, for example, to facilitate entry for an animal. In the context of the adjacent arrangement, an arrangement in which even a small animal does not have to overcome any significant obstacle to reach the load-bearing space from the ramp through the entry opening advantageously relates to a distance of between 5 cm and 30 cm, particularly preferably 10 cm. The ramp can advantageously be held displaceably in a guide below the floor section. A ramp lock can preferably be used to ensure that the ramp cannot be extended while driving.

[0045] It may be provided that the first bottom telescopic section is connected to the first wall telescopic section by means of a connecting part in a force-transmitting manner and / or that the second bottom telescopic section is connected to the second wall telescopic section by means of a connecting part in a force-transmitting manner.

[0046] Preferably, a number of connecting parts can join a number of telescopic sections together. Using connecting parts reduces manufacturing costs by decreasing the number of required power transmission units, as illustrated below by a specific embodiment: ▪ First, a power transmission unit can connect the first with the second wall telescopic section. ▪ Furthermore, a connecting part connects the first bottom telescopic section to the first wall telescopic section, and another connecting part connects the second bottom telescopic section to the second wall telescopic section. ▪ If a user pulls on the first wall telescopic section in a first extension direction, the force transmission unit causes the second wall telescopic section to extend in a second extension direction. ▪ The connecting parts ensure that when the wall telescopic sections move, the floor telescopic sections also move, without requiring, for example, an additional power transmission unit.

[0047] Similarly, the base can also have the power transmission unit, or a front wall and / or a rear wall can have a number of power transmission units.

[0048] Furthermore, it can be provided that the side wall forms the connecting part.

[0049] A side wall can be particularly advantageous as a connecting element, as it is especially well-suited for the homogeneous transmission of forces. Furthermore, using a side wall to increase the load-bearing capacity is particularly intuitive and helps to prevent damage.

[0050] In one embodiment, it may be provided that the base and / or wall includes a number of securing devices which secure an extension position.

[0051] As a measure to ensure maximum operational safety, a safety device with a number of securing elements can be provided, which secures the base part and / or the wall in an extended position and / or in an initial position. In initial, non-public tests, safety catches have proven to be particularly effective and easy to handle.

[0052] In the extension direction, a multitude of extension positions can be provided along the length of the telescopic sections. These extension positions can be essentially freely selectable, preferably through stepless extension, so that the load-bearing capacity is also continuously increased. Alternatively or additionally, a discrete number of extension positions with a correspondingly correlated size or capacity of the load-bearing capacity can be provided, which, for example, corresponds to the number of securing devices preferably securing each extension position. Particularly preferably, three positions can be implemented: a starting position, a middle position, and a maximum extension position.

[0053] It may also be provided that the front wall and / or the rear wall has a number of securing devices which secure a number of telescopic shots in an extended position and / or in a starting position.

[0054] The previously described securing devices can preferably be arranged in the front wall and / or the rear wall, as positioning there is easily accessible for a person handling the device and can provide securing with simple means.

[0055] According to a further development, it can be provided that at least one wall recess is formed in the wall and a telescopic section recess is formed in a wall telescopic section, wherein the wall recess and the telescopic section recess can be arranged in an extension position and / or in a starting position aligned with each other, and wherein preferably the locking device has a locking pin which optionally extends into the recesses.

[0056] A locking device as already mentioned is particularly simple and reliable. A number of recesses in the wall and in a number of telescopic sections can be aligned with one another. By means of a locking lug, locking or locking pin, or similar, an extended position and / or an initial position can be secured against further, unintentional relative movement, and further movement is only permitted after the securing means has been removed from the number of recesses. Particularly preferably, at least two recesses, for example in the form of a bore, are provided in a wall telescopic section and at least one recess, for example also in the form of a bore, is provided in a wall, wherein the recesses in the wall telescopic section are arranged offset from one another in the extension direction.Such an arrangement of the recess can be useful to secure both the extended position and the initial position, in which the load-bearing space is minimal, against unintentional movement.

[0057] It may be advantageous to provide a large number of wall recesses and telescopic shot recesses, which can optionally be arranged in alignment with each other, such that a large number of extension positions can be set, whereby a first extension position creates a smaller load-bearing space than a second extension position.

[0058] Based on the previous description, a plurality of recesses can be provided, particularly in the wall, preferably in the front wall and / or rear wall, in order to be able to secure not only an initial position and an extended position, but instead a plurality of extended positions. In this way, a handler can be enabled to react to individual load situations and create the load-bearing space as small as possible and as large as necessary. This is because with increasing size of the load-bearing space, the usability can be impaired due to limited space in the traffic area, particularly when using the load-bearing device with a cargo bike.

[0059] According to a second aspect of the invention, a cargo bicycle is proposed, comprising a frame and a load-bearing device supported by the frame, wherein the load-bearing device has a number of the described features.

[0060] Further development may include the provision that the cargo bike is designed in the Long John style, such that the load-bearing device is arranged in the direction of travel of the cargo bike between a steering tube and a fork unit.

[0061] The presented load-bearing device is particularly suitable for modular manufacturing. Preferably, no significant material-bonded connection techniques are used, thus enabling demand-specific assembly of the components and simple, single-material disassembly, which improves the recyclability of the materials used. The principle of identical parts has already been mentioned, which allows the wall to preferably comprise a front and a back wall, which are essentially identical in design. Identical parts can simplify manufacturing and assembly and reduce the potential for errors. Lightweight plastic panels for use in the base and / or the wall have proven particularly advantageous in initial, non-public trials.It has proven advantageous to mill any support plates preferably from a solid material, in order to avoid, for example, the need to purchase costly (injection) tooling. A number of plate materials can advantageously include lightweight plastic sheets.

[0062] Further features, details, and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. They show: Fig. 1a, b an embodiment of a load-carrying device in the initial position ( Fig. 1a) and in extended position ( Fig. 1b), Fig. 2 a rear wall from the embodiment according to Fig. 1a, b, and Fig. 3a, b an embodiment of a cargo bike with a load-carrying device in the initial position according to Fig. 1a ( Fig. 3a) and in extension position according to Fig. 1b ( Fig. 3b).

[0063] Fig. Figure 1a shows an embodiment of a load-handling device 1 in its initial position AS, with a front wall 31 (indicated by a dashed arrow) and a rear wall 32, forming part of a wall 3 which is connected to a base section 2. Two side walls 33 each have an entry opening 34 and a step opening 35, the entry opening 34 being optionally closable by means of a pivoting door leaf 36. The base section 2 and the wall 3 define a receiving space. A door lock 39 secures the door leaf 36 in the closed position. The side walls 33 are connected to the front wall 31 and the rear wall 32 by angle brackets 14. All panel materials are lightweight plastic panels.

[0064] The load-bearing device 1 now in an extended position ES shows Fig. 1b, wherein a first bottom telescopic section 20a and first wall telescopic sections 30a are extended in a first extension direction EW1 (indicated by a dashed arrow), and a second bottom telescopic section 20b (not visible for illustrative purposes) and second wall telescopic sections 30b are extended in a second extension direction EW2 (indicated by a dashed arrow) in a mirror-symmetrical manner. The bottom telescopic sections 20a, b are each connected to a side wall 33, so that when the side wall 33 on the left in the direction of travel FR is handled, in particular when the side wall 33 is pulled in the extension direction EW1, for example, the first bottom telescopic section 20a and the first wall telescopic sections 30a are carried along, such that the overall load-bearing space is increased. The functioning of a synchronous movement in the extension direction EW2 is described in connection with Fig. 2 explained. The extension directions EW1, EW2 are aligned perpendicular to the central axis M (indicated by a dashed line) of the load-bearing device 1.

[0065] The Fig. The front wall 31 shown in 1a, b is identical in construction to the rear wall 32, which is described in detail below. Fig. 2 is described, with the embodiment in which a maximum extension position ES is assumed. A shot guide 5 is mounted on a support plate 6 with two edge sections 9. The shot guide has four parallel and spaced-apart guide rails 51, in each of which sliding carriages are slidably mounted. Two sliding carriages each, concealed by the wall telescopic sections 30a, b and therefore not visible in the figure, are attached to the first and second wall telescopic sections 30a, b respectively, so that the wall telescopic sections 30a, b are slidably mounted along the guide rails 51. The minimum starting position AS is limited inwards by several stops 50.

[0066] A scissor joint 40 with four articulated arms 44 is mounted on a joint axis base 43. Two articulated arms 44 are aligned along a common path and extend radially from the joint axis GA (indicated by a dashed line) in the extension direction EW1 and EW2, respectively. A cylindrical pin with a sliding bearing bushing 45 is arranged at the end of each articulated arm 44. These are guided in a cam track 41 (direction of movement indicated by a dashed double arrow), which is located in the wall telescopic sections 30a and b. Following the description to Fig. 1b, when the side wall 33 is pulled in the extension direction EW1, the tensile force from the first wall telescopic section 30a is introduced into the scissor joint 40 via the cam guide 41 and transferred to the second wall telescopic section 30b. As a result, a synchronous movement of the first and second wall telescopic sections 30a, b is achieved. Similarly, a working pressure acting on a first wall telescopic section 30a, in the form of a compressive force exerted by a user, is transferred and converted into a force that retracts the second wall telescopic section 30b to form an extension position ES with a comparatively smaller load-bearing capacity than the original position, or to assume the initial position AS with a minimal load-bearing capacity.

[0067] Furthermore, Fig. 2 a plurality of telescopic shot recesses 38 arranged, each in the form of a bore, which can optionally be arranged flush with a wall recess 37 to secure an extension position ES or the starting position AS.

[0068] The joint space 7 is essentially covered by a cover plate and screwed to the edge sections 9 of the support plate 6, thus protecting the scissor joint 40, the cam guide 41, and the guide rails 51 from contamination or the like. For illustrative purposes, the cover plate is not shown in the diagram.

[0069] Fig. Figures 3a and 3b show a sketched embodiment of a cargo bike 10 in long-john design with a load-bearing device 1 in initial position AS according to Fig. 1a ( Fig. 3a) and in extension position ES according to Fig. 1b ( Fig. 3b). The load-bearing device 1 is arranged in the direction of travel FR of the cargo bike 10 between a steering tube 11 and a fork unit 12.

[0070] The front wall 31 is aligned at an angle to the rear wall 32, such that the load-bearing space extends upward from the base part 2 and rests against the frame 13 of the cargo bike 10. A spring-loaded locking pin 42 extends through the wall recess 37 into a telescopic recess 38 to secure the starting position AS.

[0071] Fig. 3b, in contrast, shows the load-bearing device 1 in its maximum extended position, with the extended position secured by the spring-loaded locking pin 42. The locking pin 42 extends through the wall recess 37 into a telescopic recess 38.

[0072] Both the front wall 31 and the rear wall 32 each have a locking pin 42. To ensure that this does not hinder a desired change of position, a locking pin 42 can have a rotary lock, so that it must first be pulled out of the recesses 37, 38 against a spring force and is held in a locked position by an eighth or quarter turn. Independently of the described embodiment, the rear wall 32 in particular can have the described rotary lock. The synchronous, mirror-symmetrical extension ensures that the center of gravity of the load-carrying device 1, and thus the center of gravity of the cargo bike 10, is not shifted, which significantly improves handling and traffic safety.

[0073] The invention is not limited to one of the embodiments described above, but can be modified in many ways.

[0074] All features and advantages arising from the claims, the description and the drawings, including design details, spatial arrangements and method steps, can be essential to the invention both individually and in a wide variety of combinations. List of reference symbols 1 load-bearing device 2 Base section 3 walls 4 Power transmission unit 5 Shooting 6 Carrier plate 7 Joint space 8 safety devices 9. Marginal section 10 cargo bikes 11 Steering tube 12 Fork unit 13 frames 14 angle brackets 20a first ground-level telescopic shot 20b second ground telescope shot 30a first wall telescope shot 30b second wall telescope shot 31 Front wall 32 Back panel 33 Side wall 34 Entry opening 35 Step opening 36 Door leaf 37 Wall recess 38 telescopic shot recess 39 Door lock 40 Scissor joint 41 Backstage tour 42 Safety pin 43 Articulated axle bases 44 articulated arm 45 Cylindrical pin with sliding bearing bushing 50 keystrokes 51 Guide rail AS starting position EW1 first extension direction EW2 second extension direction ES extension position FR direction of travel GA articulating axle LA Load handling area M central axis QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2018 001 016 U1

[0006]

Claims

[1] Load-carrying device (1) for a cargo bicycle (10), in particular for a cargo bicycle (10) in long-john design, with a base part (2) and with a wall (3) adjoining the base part (2), such that the base part (2) and the wall (3) delimit a load-bearing space (LA), characterized by , that the base part (2) has a first and a second base telescopic section (20a, 20b) and the wall (3) has a first and a second wall telescopic section (30a, 30b), wherein the first floor telescopic section (20a) selectively extends the floor part (2) and the first wall telescopic section (30a) selectively extends the wall (3) in a first extension direction (EW1), and wherein the second floor telescopic section (20b) optionally extends the floor part (2) and the second wall telescopic section (30b) optionally extends the wall (3) in a second, preferably opposite, extension direction (EW2) to the first, such that the load-bearing space (LA) is increased with the expansion, and wherein a number of power transmission units (4) connect the first to the second floor telescopic section (20a, 20b) and / or the first to the second wall telescopic section (30a, 30b). [2] Load-bearing device (1) according to claim 1, characterized by , that at least one force transmission unit (4) is designed as a scissor joint (40), wherein preferably in the first and second floor telescopic section (20a, 20b) and / or in the first and second wall telescopic section (30a, 30b) a link guide (41) is formed, in which the scissor joint (40) is guided. [3] Load-bearing device (1) according to claim 2, characterized bythat the scissor joint (40) has at least one sliding part which is slidably mounted in the link guide (41) and / or that the scissor joint (40) has at least one roller which is rollingly mounted in the link guide (41). [4] Load-bearing device (1) according to one of the preceding claims, characterized by in that a shot guide (5) is formed which guides the first and second floor telescopic shots (20a, 20b) and / or the first and second wall telescopic shots (30a, 30b) along an extension direction (ER1, ER2). [5] Load-bearing device (1) according to claim 4, characterized by that the weft guide (5) has a sliding carriage which is displaceably mounted in a guide rail (51) and / or the weft guide (5) has a guide roller which rolls on a guide track. [6] Load-bearing device (1) according to one of the preceding claims, characterized by , that a central axis (M) of the load-carrying device (1) is aligned in the direction of travel (FR) of the cargo bicycle (10), preferably parallel to the direction of travel (FR), wherein preferably the first and second extension directions (EW1, EW2) are aligned perpendicular to the central axis. [7] Load-bearing device (1) according to claim 6, characterized by , that the wall (3) comprises a front wall (31) in the direction of travel (FR) and a rear wall (32) opposite the front wall (31), wherein preferably the front wall (31) and rear wall (32) each have a first and a second wall telescopic section (30a, 30b). [8] Load-bearing device (1) according to one of the preceding claims, characterized by that the wall (3) has a force transmission unit (4), in particular the front wall (31) and / or the rear wall (32) has a force transmission unit. [9] Load-bearing device (1) according to claim 6 or 7, characterized by that the front wall (31) and the rear wall (32) delimit a load-bearing space (LA) which is extended from bottom to top starting from the base part (2). [10] Load-bearing device (1) according to one of claims 6 to 8, characterized by , that the base part (2), the front wall (31) and / or the rear wall (32) each comprise / comprise a support plate (6) and a cover plate, wherein the telescopic sections (20a, 20b, 30a, 30b) and the force transmission unit (4) are arranged between the carrier plate (6) and the cover plate. [11] Load-bearing device (1) according to claims 5 and 10, characterized by that the carrier plate (6) has the guide rail (51) and / or the guide track. [12] Load-bearing device (1) according to one of claims 6 to 11, characterized by , that the wall (3) comprises at least one side wall (33), which is essentially parallel to the central axis (M), wherein preferably the side wall (33) is connected to the front wall (31) and to the rear wall (32). [13] Load-bearing device (1) according to claim 12, characterized by that the side wall (33) is connected to the base part (2) in a force-transmitting manner. [14] Load-bearing device (1) according to claim 12 or 13, characterized by that an entry opening (34) and / or a step opening (35) is formed in at least one side wall (33). [15] Load-bearing device (1) according to claim 14, characterized by that a movable door leaf (36) is formed, with which the access opening (34) can be selectively closed. [16] Load-bearing device (1) according to claim 14 or 15, characterized by a ramp which optionally leads into the entry opening (34). [17] Load-bearing device (1) according to one of the preceding claims, characterized by that the first floor telescopic section (20a) is connected to the first wall telescopic section (30a) by means of a connecting part in a force-transmitting manner and / or the second floor telescopic section (20b) is connected to the second wall telescopic section (30b) by means of a connecting part in a force-transmitting manner. [18] Load-bearing device (1) according to claims 12 and 17, characterized by that the side wall (33) forms the connecting part. [19] Load-bearing device (1) according to one of the preceding claims, characterized by that the base part (2) and / or the wall (3) comprises / comprise a number of securing means (8) which secure an extended position (ES) and / or an initial position (AS). [20] Load-bearing device (1) according to one of claims 7 and 19, characterized bythat the front wall (31) and / or the rear wall (32) has a number of securing means (8) which secure a number of telescopic sections (20a, 20b, 30a, 30b) in an extended position (ES) and / or in an initial position (AS). [21] Load-bearing device (1) according to claim 20, characterized by , that at least one wall recess (37) is formed in the wall (3) and one telescopic section recess (38) is formed in a wall telescopic section (30a, 30b), wherein the wall recess (37) and the telescopic recess (38) can be arranged in alignment with one another in an extended position (ES) and / or in an initial position (AS), and wherein preferably the securing means (8) comprises a securing pin which selectively extends into the recesses (37, 38). [22] Load-bearing device (1) according to claim 21, characterized byin that a plurality of wall recesses (37) and telescopic recesses (38) are formed, which can be arranged selectively in alignment with one another, such that a plurality of extension positions (ES) can be set, wherein a first extension position (ES) creates a smaller load-bearing space (LA) than a second extension position (ES). [23] Cargo bike (10), with a frame (13) and with a load-bearing device (1) carried by the frame (13), wherein the load-carrying device (1) is designed according to one of the preceding claims. [24] Cargo bike (10) according to claim 23, characterized by that the cargo bike (10) is designed in a long-john construction, such that the load-bearing device (1) is arranged in the direction of travel (FR) of the cargo bike (10) between a steering tube (11) and a fork unit (12).

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