Transport trolley with individually variable loading volume

Abstract

Transport trolley (1) with 4 wheels for transporting loads, made of metal profiles in frame constructions (28, 29) of the front and rear (25, 26) as well as longitudinal sides (30) and a base characterized in that, in the state of use, the scissor joint constructions of the longitudinal sides (10, 10', 11, 11') and / or pluggable tubes of the rollover protection (12, 12') of the transport trolley (1) are individually adjustable on both sides in a form-fit and force-fit manner, as is an adjustable grid base (17) or extendable base plate (34) and that the distance between the front wheels (2, 2') is proportionally greater than the distance between the rear wheels (3, 3')

Description

Main claim

[0001] 1) Transport trolley(1) with 4 wheels for transporting loads, made of metal profiles in frame constructions(28,29) of the front and rear(25,26) as well as longitudinal sides(30) and a base characterized by, that, in the state of use, the scissor joint constructions of the longitudinal sides (10, 10', 11, 11') and / or pluggable tubes of the rollover protection (12, 12') of the transport trolley (1) are individually adjustable on both sides in a form-fit and force-fit manner, as is an adjustable grid floor (17) or extendable floor plate (34), and that the distance between the front wheels (2, 2') is proportionally greater than the distance between the rear wheels (3, 3') Background and state of the art:

[0002] City centers are increasingly being closed or restricted to motor vehicle access for environmental reasons. Metropolitan areas and large cities are particularly affected. This leads to problems for tradespeople and service providers who need to transport their equipment to construction sites within residential areas. Shopping and finding parking by car are also impacted.

[0003] Solutions are offered here using so-called handcarts, hand-pulled load carriers with a drawbar and swivel wheels, featuring side panels and a base. Development has shown that these relatively bulky handcarts can alternatively be folded with scissor-shaped side panels made of profiled bars and foldable mesh floors, thus requiring less volume for transport than those with rigid side panels and a fixed base. The scissor-shaped side panels consist of profiled bars held together by hinges, as does the mesh floor. For use, these structures are unfolded without losing their connection to each other. Furthermore, the side panels are open, allowing the cart to be lined with an inner bag. DE 10 2022 132 504 A1 illustrates such a solution.

[0004] A disadvantage of this design is that the scissor-frame design only has two settings: folded for compact transport and unfolded for larger loads. These are the only possible configurations determined by the predetermined extensions of the scissor-frame design. There are no intermediate settings for medium or variable volumes. Furthermore, attaching it as a bicycle trailer is problematic due to the narrow wheelbase of standard front wheels and their independent suspension. This is only feasible at walking speeds, similar to those encountered when pulling the trailer. At higher speeds, the system becomes unstable, and the trailer tends to tip over sideways when cornering due to centrifugal forces acting on the narrow front wheelbase, forces that cannot be reliably transferred to the ground.

[0005] DE 10 2018 117 293 A1 has the same problem even without functioning as a bicycle trailer, due to the closely spaced front wheels. Disclosure of the invention

[0006] These dangers are eliminated by the advantages of the invention, namely individually adjustable side walls, floor grids, and an additional adjustable rollover protection system, as well as a wide wheelbase for the front wheels on a rigid axle, which gives the transport cart better traction and reduces centrifugal forces in curves at higher speeds. Furthermore, the extended length of the transport cart optimally counteracts torsional forces with a wider wheelbase. Another advantage of the invention is that the drawbar, designed as a telescopic drawbar, is also suitable for use as a bicycle trailer at higher speeds than walking speed, and the transport cart has optimal steering characteristics on various surfaces when pushed or pulled, largely due to the wide, air-filled tires.Using suitable, commercially available mounting points on the bicycle and the drawbar of the transport cart, a secure and articulated connection to the rear axle, luggage rack, or seat post of a bicycle is possible. The steering function of the transport cart can be customized, whether pulling or pushing, by optionally fixing the rotating front axle with a clamp or individually fixing the articulated rear wheels with locking bolts. This allows for either straight-line tracking only, a steerable front axle when the transport cart is pulled by a bicycle trailer, or steerable rear wheels when the transport cart is pushed using a handle. Of course, the front axle and the individual rear wheels can also be optionally made rotatable, which is advantageous when pulling over uneven surfaces. In this case, the wide, air-filled tires are particularly effective.

[0007] A further advantage is the attachment of stiffening tubes to the top of the transport trolley with corresponding force-fit and form-fit fixings using commercially available cross clamps. According to the invention, the fixing positions of the stiffening tubes can be individually adjusted in height, thus eliminating the need for the scissor-frame construction, as the rollover protection alternatively provides the stiffening of the transport trolley as a frame structure. Additionally, the transport trolley is further stabilized in various positions during use by means of a force-fit scissor-frame. Furthermore, the rollover-style protection then provides a protective function in the event of a fall, for example, when transporting animals and children who may be transported in the trolley.

[0008] Regardless of the trolley's length, a tilting mesh panel is located at the rear. When folded down, this panel provides access to the trolley's interior. If the interior is lined with a pocket-like lining or a fixed box with or without a lid that can be opened, this allows access for animals, for example, to enter the trolley. Additionally, the top of the trolley, above the rollover protection, can be securely covered with a privacy panel or a roll-up screen. This eliminates the need for the bottom mesh panel without compromising stability. The folded-down mesh panel at the rear then serves as a loading point from the back and is ideal for transporting elongated items that exceed the trolley's maximum length setting, such as surfboards or ladders.Furthermore, racks or panniers can be attached to the sides or around the perimeter to provide additional storage options. Thanks to the variable, force-locking length extension via the individually extendable base grid, the load-bearing capacity of the transport trolley remains completely unchanged.

[0009] With compatible and securely attached child seats (e.g., ISO-Fix from the car), safe transport of children and their toys is guaranteed. The extendable length of the transport wagon allows for the transport of one or two small children, which can be pulled or pushed by hand or used as a bicycle trailer. Two additional children's bicycles can also be carried on the side U-shaped holders, for example, when the children tire of cycling independently and need to transfer to the wagon. When folded, the transport wagon can be pulled by a bicycle, transported in a car trunk, and then unfolded for use.

[0010] By using a bag that matches the interior dimensions of the transport cart, a variety of uses for animals and items are possible, for tradespeople, water sports enthusiasts, or shopping trips. Therefore, the transport cart's tires are extra wide and air-filled to handle all types of terrain.

[0011] The mounted roller grid is suitable for use as a rolling table, as well as for use as a mobile gas grill with a gas cylinder and food. The diverse applications of this inventive novelty are further defined by means of exemplary drawings, reference numerals, and the associated claims. These illustrated embodiments represent only a small selection; the specifications in the claims may encompass further advantageous applications. Character description Fig. Figure 1 shows a perspective view of a possible configuration of the transport cart in manual pull position and as an attachment point for a bicycle trailer. The image features a large overhang of the front wheels compared to the rear wheels, an open rear with a mesh wall, an adjustable floor grid, height-adjustable fixings for the telescopic tubes of the rollover protection, and variable fixings for the scissor-type mesh panels along the front and rear profile frames. The attachment point for use as a bicycle trailer is visible at the end of the drawbar above the attached handles. Fig. 2: shows the condition of the transport trolley in use with the attached pocket-shaped inner lining. Fig. 3: Here, in its operational state, a roller grid support is attached over the rollover protection on the transport trolley to create a mobile table shelf. Fig. Figure 4 shows the transport trolley with an extended base plate in use, instead of the base grid. Fig. 5: In this case, if there is no bottom grid, an open box is suspended in the transport trolley and attached to the rollover protection in a form-fitting and force-fit manner. Fig. Figure 6 shows the front view of the push trolley, where the handles are fixed at right angles to the rollover protection tubes by height-adjustable cross clamps using extension inserts, ensuring a positive and force-fit connection. The larger distance between the front wheels of the rigid axle and the rear wheels is also visible, as are the side U-bolts for transporting additional items. Fig. 7: Illustration of the transport trolley in its folded state without rollover protection. Fig. Figure 8: Also shown are the U-brackets, and the maximum extension of the floor grid and the rollover protection. Additionally, the maximum extension of the scissor gates in their sliding position is shown. Fig. Figure 9 shows the largest longitudinal adjustment of the transport trolley by means of extended scissor gates in the operating state with telescopic adjustment of the rollover protection and the floor grid without U-bolts. Fig. Figure 10 shows the transport trolley as a form-fitting and force-fit frame construction without lateral scissor gates. Detailed description of the figures

[0012] Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. Figure 5 shows the transport trolley 1 with the front 26 and rear 25, as well as the longitudinal side view 30. In its operating state, the rigid axle 4 with the front wheels 2, 2' is connected to the frame structure 28 of the front 26 via the telescopic drawbar 9 and the pivot joint 8. The floor grid 17, the open frame 29 of the rear 25, and the side scissor grids 10, 10', 11, 11' on the longitudinal sides 30 form a force-fit connection. Additional stiffeners are mounted on the frame structures 28, 29 via the height-adjustable screw clamps 22, 22', 22'', 22''' by means of pluggable tubes 12, 12'. The rear swiveling single wheels 3, 3' are articulated under the frame 29, and their swivel function can be blocked by the locking bolts 21, 21'.The scissor-type mesh panels can be moved vertically on the frame structures 28, 29 by means of sliding sleeves 15, 15', 15', 15''', in addition to the movable stiffening sleeves 16, 16', 16'', 16''' and fixing hole rows 43, 43', 43'', 43''' along the profile bars 10, 10', 11, 11' of the frame structures 28, 29. The mesh wall 14 is hinged at the bottom of the frame 29, and the foldable mesh floor 17 with the adjustable extension bars 18, 18' and their fixing 19, 19' is hingedly attached to the frame structures 28, 29. The telescopic drawbar 5 has at its end both a handle 6 for pushing and pulling, as well as a bearing head 7 for coupling as a bicycle trailer. Fig. 2 Additionally, a foldable bag 31 with overlapping edges is suspended in the transport trolley 1. Fig. Figure 3, on the other hand, shows the attachment of a roller shutter 32 to the telescopic tubes 12, 12', by means of fixing 33, 33', 33'', 33'''. At Fig. 4 The base grid 17 is replaced by an extendable base plate 34. In addition, the fixing clamp 20 prevents rotation of the rigid axle, so that the vertical position of the drawbar 9 is held by means of the bracket 27 and the transport trolley 1 is steered by pushing only by loosening the fixing bolts 21, 21' of the rear wheels 3, 3'. Unlike in Fig. 2 is at Fig. 5. A box 35 is suspended in the transport trolley 1 and connected to the pluggable tubes 12, 12' by means of a form-fit and force-fit connection using tabs 36, 36'. This spatial stiffening eliminates the need for the extendable base plate 34. In all these figures, the distance between the front wheels 2, 2' at the front is greater than the distance between the rear wheels 3, 3'. This shows Fig. 6 in the front view 26 clearly, wherein additionally U-bolts 42,42',42'',42''' are attached laterally to the frame constructions 28.29 and the sliding function of the transport trolley is given by releasing the rotational movement of the fixing bolts 21,21' and the steering via the rear wheels 3,3' by means of the handle sleeves 39,39', with fixation on the pluggable tubes 12,12' and the force-locking fixing clamp 28. Fig. Figure 7 shows the transport trolley folded up without the 12.12' telescopic tubes. Fig. Figure 8 shows the transport trolley in its maximum extended position of the scissor gates 10, 10' and 11, 11'. The base grid 17 is also extended by means of extension rods 18, 18' and the fixing screws 19, 19'. The U-brackets 42, 42', 42'', 42''' further illustrate the transport extension for extra-long goods that exceed the maximum extension length of the transport trolley. Fig. 9 lack these brackets, so the rear, foldable grid wall 14 takes over this function. Fig. The scissor gates 10,10',11,11' and their connections to the front and rear profile frames 28,29 are missing. Only through the connections of the frames 28,29, the floor grid 17 and rollover protection 12,12' does the transport trolley 1 become usable in a form-fitting and force-fit manner, for pulling, pushing and as a bicycle trailer. Reference symbol list: 1 View of transport trolley in working order 2.2' front wheels on rigid axle 3.3' rear wheels, independent suspension rotatable 360 ​​degrees 4 rigid axle 5 telescopic drawbars 6 handle telescopic drawbar 7. Bearing head for bicycle trailer coupling 8 pivot joints for rigid axle 9 Telescopic drawbar with vertical movement 10.10' Profile bars for connecting scissor lattice longitudinal side 11.11' Profile bars for connecting scissor grids, longitudinal side 12.12' pluggable tubes for rollover protection 13.13' telescopic tube extension 14 Grid wall back 15,15',15", 15"; Vertical sliding sleeves on frame construction 16,16',16'',16'' Stiffening sleeves on profile bars of the scissor lattice 17 View of foldable grid floor with profile bars 18.18' Extension bars from the grid floor 19,19' Fixing screws Extension rods 20 Fixing clamps against rotational movement Rigid axle 21,21' Locking bolts against horizontal rotation of the rear wheels 22,22',22'',22'' Screw clamps for fixing telescopic tubes 23 View Distance front wheels to side wall Transport trolley 24 View Distance rear wheels to side wall Transport trolley 25 View Rear of Transport trolley 26 Front view Transport trolley 27 Telescopic drawbar bracket 28 Profile frames, front closed 29 Profile frame back open 30 View of at least one long side of the transport trolley 31 Hanging pockets with overlapping edges 32 roller shutters 33,33',33'',33'' Fixing roll-up slatted base 34 extendable base plate 35 open transport boxes 36.36' Clamping tabs for transport box 37 Folded grid floor in transport condition 38 Folded scissor grid in transport state 39.39' Grip sleeves 40.40' Fixing of handle extension with rollover protection 41.41' Joint for foldable floor grid 42,42',42'',42''' U-bolts on the side profile frames 43,43',43'',43'' Rows of holes for fixing the profile bars 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 10 2022 132 504 A1

[0003] DE 10 2018 117 293 A1

[0005]

Claims

[1] Transport trolley (1) with 4 wheels for transporting loads, made of metal profiles in frame constructions (28,29) of the front and rear (25,26) as well as longitudinal sides (30) and a base characterized by , that, in the state of use, the scissor joint constructions of the longitudinal sides (10,10',11,11') and / or pluggable tubes of the rollover protection (12,12') of the transport trolley (1) are individually adjustable on both sides in a form-fit and force-fit manner, as is an adjustable grid floor (17) or extendable floor plate (34), and that the distance between the front wheels (2,2') is proportionally greater than the distance between the rear wheels (3,3') [2] Transport trolley (1) according to claim 1, characterized by, that the fixable adjustment of at least one longitudinal side(30), at least one telescopic tube(12) and the grid floor(17) is positively and force-fit connected to the frames(28,29) in the state of use and an individually variable transport volume is achieved. [3] Transport trolley (1) according to claim 1, characterized by , that the fixable adjustment of at least one longitudinal side(30) of the scissor gates (10,10',11,11') on the profiles of the frame front and back(28,29) is achieved by predefined rows of holes with fixing points (43,43',43'',43'''). [4] Transport trolley according to claim 1, characterized by , that, by pushing together the side scissor grids (10,10',11,11') and pushing up the grid floor (17) by means of a joint (41,41') the transport trolley (1) can be folded together [5] Transport trolley according to claims 1 to 4, characterized by, that all wheels(2,2',3,3') of the same size are arranged below the grid floor(17), wherein the front wheels(2,2') are arranged on the drawbar(9) by means of a horizontally rotatable rigid axle(4) and the rear wheels(3,3') by means of a rotatable single wheel attachment. [6] Transport trolley(1) according to claim 5, characterized by , that the drawbar(9) is fixed vertically pivotable on the rigid axle(4) and has a hand handle(6) for pulling and handle sleeves(39,39') for pushing the transport trolley(1) in a form-fit and force-fit manner as a telescopic extension(5). [7] Transport trolley(1) according to claim 5, characterized by , that the drawbar(9) is positively locked to the rigid axle by means of a vertical joint connection with the bracket (27). [8] Transport trolley(1) according to claim 5 and 7, characterized by, that when using the handle sleeves (39, 39') to push the transport trolley (1) the drawbar (9) is fixed vertically by means of the bracket (27), as well as by means of the fixing clamp (20) on the rigid axle (4) whereby steering is possible by means of the rotational movement of the rear individual wheels (3, 3'), by loosening the fixing bolts (21, 21'). [9] Transport trolley (1) according to claims 5 and 6 characterized by , that the locking bolts (21,21') of the rear individual wheels (3,3') block the rotation by 360 degrees and steering of the transport carriage (1) is carried out via the rigid axle (4) of the front wheels (2,2'). [10] Transport trolley (1) according to claim 5, characterized by, that the profile frames (28,29) of the transverse sides (25,26) above the transport carriage (1) are each connected to at least two longitudinally pluggable, movable tubes (12,12') and / or telescopic tubes (13,13') parallel to at least one longitudinal side (30) in a form-fit and force-fit manner by means of screw clamps (22,22',22'',22''') and the position of the tubes forms an overturn protection (12,12'), wherein the screw clamps (22,22',22'',22''') are height-adjustable by means of threaded rods. [11] Transport trolley (1) according to claims 7 and 9, characterized by , that the tubes (12,12') or (13,13') and threaded rods (22,22',22'',22''') are made of metal and at the end of the metal tubes on the front (26) bracket sleeves (39,39') are arranged and fixed at right angles, which form a positive connection on both sides with the hand handle (6) of the drawbar (9), wherein the metal tubes (12,12') with the bracket sleeves (39,39') can also be made from one piece. [12] Transport trolley (1) according to claim 10, characterized by , that, on the rear side(25) the open profile frame(29) is connected on both sides by means of a connecting element. [13] Transport trolley (1) according to claim 11, characterized by , that the metal tubes (12,12') achieve the function of positively and force-fit fixing the transport trolley(1) even without the scissor profile construction (10,10',11,11') in the longitudinal direction. [14] Transport trolley (1) according to claim 13, characterized by , that the inserted form-fitting and force-locking floor grid(17) is foldable by means of joints (41,41'). [15] Transport trolley(1) according to claims 10 to 13, characterized by , that, through the aforementioned positions on the transport trolley(1) it is stiffened in a form-fitting and force-fit manner. [16] Transport trolley (1) according to claim 1, characterized by, that the profile construction (28,29) of the front and back sides (25,26) has upwardly open U-shaped brackets (42,42',42'',42''') for transporting extra-long loads. [17] Transport trolley (1) according to claim 1, characterized by , that at least one transverse side of the transport trolley (1) has a grid wall (14) that can be pivoted outwards, whereby this transverse side forms a closed area [18] Transport trolley (1) according to claim 1, characterized by , that the transport trolley (1) has a pocket-shaped (31) inner lining or a box (35) with or without a lid, which is attached to the pluggable tubes (12,12') by means of clamping tabs (36,36') in a form-fit and force-fit manner. [19] Transport trolley (1) according to claim 18, characterized by , that the box(35) or hanging bag(31) enables the transport of animals. [20] Transport trolley (1) according to claims 1 to 6, characterized by, that, in addition to the handle(6) at the drawbar end(9) of the transport trolley (1) there is a receptacle (7) for a bicycle trailer coupling. [21] Transport trolley (1) according to claim 20, characterized by , that a commercially available bicycle trailer coupling is arranged on the seat post or on the luggage carrier or on the rear wheel axle, depending on the design, and the drawbar(9) is attached centrally or off-center to the rigid axle(4). [22] Transport trolley (1) according to claim 1, characterized by , that the wheels(2,2',3,3') of the transport trolley(1) are fitted with air-filled wide tires. [23] Transport trolley (1) according to claim 1, characterized by , that a cover is fixed to the pluggable tubes (12,12') in a form-fit and force-fit manner (33,33'), in the form of a roller shutter (32) or a closed plate. [24] Transport trolley (1) according to claim 1, characterized by, that the stiffening of the form- and force-locking, pluggable tubes (12,12') eliminates the need for the floor grid (17) of the transport trolley (1). [25] Transport trolley (1) according to claim 23, characterized by , that, over the rollover protection (12,12') and the profile frame of the front and rear (28,29) an all-round rain-repellent hood made of plastic fabric is pulled, which extends to the wheels (2,2',3,3'). [26] Transport trolley (1) according to claim 25, characterized by that the hood has transparent viewing windows and / or ventilation slots. [27] Transport trolley (1) according to claim 1, characterized by , that, traffic-safe fixing points are located inside the transport vehicle (1) for the form-fitting and force-fit fixing of car child seats or dog transport cages. [28] Transport trolley (1) according to claim 1, characterized by, that the positioning of the front wheels (2,2') on the rigid axle (4) extends at least one wheel width beyond the respective front (26) of the transport carriage (1) and extends beyond the rear wheels (3,3'). [29] Transport trolley (1) according to claim 1, characterized by , that the transport trolley(1) has devices on the side for attaching bicycle bags when in use. [30] Transport trolley (1) according to claim 1, characterized by , that the transport trolley (1) is protected against unintentional movement by the use of at least one parking brake on the wheels (2,2',3,3'). [31] Transport trolley (1) according to claim 1, characterized by that markings with signal effects in bicycle trailer operation result in sufficient road safety. [32] Transport trolley (1) according to claim 1, characterized by, that a height-adjustable sunshade and / or rain cover is attached to the pluggable tubes (12,12') or the frames (28,29). [33] Transport trolley (1) according to claim 1, characterized by , that at least one wheel (2,2',3,3') of the transport trolley (1) is driven by an integrated electric motor to assist when pushing or pulling. [34] Transport trolley (1) according to claim 1, characterized by , that the tubes (12,12') are assembled from several individual tubes in a form-fit and force-fit manner. [35] Transport trolley (1) according to claims 1 to 34, characterized by , that the long sides (30) have devices for receiving advertising signs. [36] Transport trolley (1) according to claims 1 to 34, characterized by , that skids for snow travel and / or wheels (2,2',3,3') are attached below the transport trolley (1).

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