Transport cart and transport method

Abstract

To provide a transport cart making it possible to readily perform transport work at a construction site of a tabular cargo.SOLUTION: A transport cart 1 is intended to transport a tabular cargo. The transport cart 1 includes a cart 2, a column material 3 disposed on the cart 2, and a cargo stand 4 attached to the top of the column material 3 so that the cargo stand can rotate on a vertical plane. When the vertical plane is seen, a rotation axis 42 of the cargo stand 4 is located at a middle of the cargo stand 4 other than both ends of the cargo stand and separated from the center of gravity of the cargo stand 4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a transport cart or the like for transporting plate-shaped objects. [Background technology]

[0002] Patent Document 1 describes a transport cart that transports plate-like objects at construction sites, with an inclined loading platform on which the objects are placed. Patent Document 2 describes a box packing platform with an adjustable inclination angle of the loading platform in the diagonal direction, where the box receiving platform is provided on a main frame, and the main frame is supported from below by legs such as support legs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-81386 [Patent Document 2] Japanese Patent Application Publication No. 2018-198588 Summary of the Invention [Problem to be solved by the invention]

[0004] At construction sites, plate-shaped items weighing over 1 ton must be loaded onto a transport cart, transported through narrow spaces such as building corridors and passenger elevators, and then unloaded. To facilitate this series of operations, it is desirable to be able to adjust the tilt angle of the loading platform to suit each task.

[0005] However, in conventional transport carts such as those in Patent Document 1 and the packing table in Patent Document 2, the loading platform rotates around its lower end, and its inclination angle is limited, making it difficult to easily perform the above-mentioned series of operations.

[0006] The present invention has been made in view of the above problems, and has as its object to provide a transport cart or the like that can easily transport plate-like objects at construction sites or the like. [Means for solving the problem]

[0007] The first invention for solving the above-mentioned problem is a transport cart for transporting plate-shaped transport objects, comprising a cart, a pillar member provided on the cart, and a loading platform attached to the top of the pillar member so as to be rotatable in a vertical plane, characterized in that when viewed in the vertical plane, the axis of rotation of the loading platform is in the middle part of the loading platform excluding both ends, and is located away from the center of gravity of the loading platform.

[0008] The transport cart of the present invention tilts the platform by rotating it around the rotation axis, making it easy to transport items on the platform even in narrow spaces such as building corridors or passenger elevators. The location of the rotation axis away from the platform's center of gravity ensures stability in the tilted state. Furthermore, because the rotation axis at the top of the pillar is positioned in the middle of the platform, the platform can be kept horizontal at a constant height, making it easy to place and load plate-like items onto the platform using a forklift or similar device. Furthermore, gradually shifting the platform from an inclined state to a horizontal state while lifting the items allows for reliable unloading. As a result, the transport cart of the present invention makes it easy to transport plate-like items at construction sites and other locations.

[0009] It is desirable that the transport cart of the first invention further comprises a support pillar that is detachable from the cart, and that the platform, which is arranged horizontally, is supported by the support pillar attached to the cart. This allows the loading platform to be stabilized in a horizontal state.

[0010] Furthermore, the transport cart of the first invention preferably has a suspending portion for hoisting the transport cart. This makes it possible to lift the transport cart from an upper floor and move it.

[0011] The loading platform preferably has a plurality of beams spaced apart in a direction perpendicular to the vertical plane, and supports for the transported items provided at the ends of the beams that are located on the center of gravity side when viewed from the rotation axis, and the transported items are preferably placed on the upper surfaces of the beams. This allows the forklift tines to pass between the beams and transfer the transported item onto the loading platform, making it easier to load the transported item. Also, by providing the support for the transported item at the end of the platform on the center of gravity side as viewed from the platform's rotation axis, i.e., at the lower end when the platform rotates and tilts, the support can lock the transported item and place it stably on the platform.

[0012] The second invention is a method for transporting plate-shaped objects using the transport cart of the first invention, characterized in that it comprises the steps of loading the object onto the platform with the platform held horizontal, and running the cart with the platform tilted. A second invention is a method for transporting an object using the transport cart of the first invention. [Effects of the Invention]

[0013] The present invention can provide a transport cart or the like that can easily transport plate-shaped objects at construction sites or the like. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. [Figure 2] 2 is a diagram illustrating loading of transported goods 20 onto a loading platform 4. FIG. [Figure 3] 4A and 4B are diagrams illustrating the rotation of the loading platform 4. FIG. [Figure 4] 3A and 3B are diagrams illustrating the planar movement of the transport cart 1. [Figure 5] FIG. 2 is a diagram illustrating the lifting of the transport cart 1. [Figure 6] 10A and 10B are diagrams illustrating unloading of transported goods 20. FIG. [Figure 7] 10A and 10B are diagrams illustrating unloading of transported goods 20. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0016] (1. Transport cart 1) Figure 1 shows a transport cart 1 according to an embodiment of the present invention, where Figure 1(a) is a side view of the transport cart 1 and Figure 1(b) is a side view of the transport cart 1 in Figure 1(a) from the direction indicated by arrow A.

[0017] As shown in FIG. 1, the transport vehicle 1 includes a carriage 2, a pillar 3, a platform 4, and support columns 5a and 5b, and the platform 4 is rotatable within a vertical plane.

[0018] The bogie 2 has a rectangular frame-like configuration in which multiple girders 21 made of steel such as H-shaped steel are arranged in parallel, and these girders 21 are connected by connecting members 24 such as H-shaped steel provided at both axial ends of the girders 21.

[0019] Casters (wheels) 22 are attached rotatably in a plane to the underside of both ends in the front-rear direction of the carriage 2. The front-rear direction corresponds to the axial direction of the beam 21.

[0020] The maximum load capacity of the transport cart 1 is about 4 tons, and it can transport heavy objects. The casters 22 may be provided with a driving unit (not shown) such as a motor to enable the cart 2 to move independently, thereby assisting the movement of the cart 2. This allows heavy objects to be transported easily.

[0021] The pillar members 3 are vertical members provided on the trolley 2 and are made of steel such as H-shaped steel. The pillar members 3 have pillar bodies 31 erected on each of the girder members 21 of the trolley 2, and bearing portions 32 provided on the upper surface of the pillar bodies 31 and supporting the rotation shafts 42 of the loading platform 4. The pillar bodies 31 on each of the girder members 21 are connected to each other by connecting members 33.

[0022] The loading platform 4 is a platform on which an object to be transported is placed and transported. In this embodiment, the object to be transported is a plate-like member having an area larger than that of the loading platform 4. The plate-like member is, for example, an iron plate used as a weight in a Tuned Mass Damper (TMD), but is not limited to this.

[0023] The loading platform 4 has a configuration in which a plurality of beams 41 are arranged in parallel and these beams 41 are connected by support members 43 provided at one end of the axial direction of the beams 41. The planar position of each beam 41 corresponds to the planar position of each beam 21 of the bogie 2.

[0024] The girder 41 is constructed by arranging the vertical portions of a pair of steel members 411, each having a U-shaped cross section, back to back. The bearing portion 32 of the pillar member 3 provided on the girder member 21 of the bogie 2 is arranged between the vertical portions of these steel members 411, and the rotation shaft 42 is arranged so as to pass through both steel members 411.

[0025] Each beam 41 can rotate within a vertical plane (plane of rotation) shown in Figure 1(a) around a rotation axis 42. This allows the entire loading platform 4 to rotate within the vertical plane. The beams 41 are arranged at intervals in a direction perpendicular to the vertical plane (corresponding to the direction normal to the paper surface of Figure 1(a)).

[0026] The front-to-rear direction mentioned above corresponds to the left-to-right direction in the vertical plane in Figure 1(a), and the rotation shaft 42 is disposed in a position different from the center of gravity C of the loading platform 4 in the front-to-rear direction, in the middle part of the loading platform 4 excluding both ends in the front-to-rear direction. Hereinafter, with regard to the transport cart 1, the side of the center of gravity C as viewed from the rotation shaft 42 will be referred to as the "front", and the opposite side will be referred to as the "rear".

[0027] The support member 43 is provided at the front end of the loading platform 4. A steel material having a U-shaped cross section with horizontal portions above and below the vertical portion is used for the support member 43. The support member 43 is arranged so as to span between multiple beams 41, and the lower horizontal portions of the support member 43 are fixed to each beam 41.

[0028] A hanging part 44 is provided on the receiving member 43. A steel material having an L-shaped cross section is used for the hanging part 44. The horizontal part of the cross section of the hanging part 44 is fixed to the horizontal part on the upper side of the receiving member 43, and a hole 45 for attaching a hanging jig, which will be described later, is provided in the vertical part of the cross section.

[0029] 1 shows the state immediately before an article is loaded onto the loading platform 4, which is horizontal. The supports 5a and 5b are members for supporting the loading platform 4 and maintaining the horizontal state, and are fixed to the top of the beams 21 of the cart 2 at the front and rear of the pillars 3, with their top surfaces abutting against the beams 41 of the loading platform 4.

[0030] Steel materials such as H-shaped steel are used for the pillars 5a and 5b, and the pillar 5b located in front of the pillar 3 is detachably fixed to a girder 21 of the bogie 2. The pillar 5a located behind the pillar 3 is connected to the pillar 3 by a connecting member 6. The pillars 5a on adjacent girder members 21 are also connected to each other by a connecting member 51.

[0031] In this embodiment, not only the support 5b but also the pillar material 3 and the support 5a can be attached to and detached from the cart 2. Therefore, the cart 2 has a high degree of freedom in configuration, and can be used with a normal cart that transports steel beams and the like, and components can also be reused or omitted.

[0032] (2. Transportation method using transport cart 1) When loading an object 20 onto the loading platform 4, as shown in Figure 2, the object 20 is placed on the tines 101 of the forklift 10, and the tines 101 of the forklift 10 are inserted between the girders 41 of the loading platform 4, which is in a horizontal position. After this, the tines 101 are lowered, so that the object 20 can be transferred onto the loading platform 4.

[0033] Thereafter, as shown in Figure 3(a), a lifting jig 30 is attached to the hole 45 (see Figure 1(b)) of the hanging portion 44 of the loading platform 4, and the front end of the loading platform 4 is suspended and supported by the claws 101 of the forklift 10 using the lifting jig 30. In this state, the support 5b is removed, and the claws 101 are lowered.

[0034] 3(b), the platform 4 rotates and becomes tilted. The rotation of the platform 4 is stopped when the front end of the platform 4 abuts on the dolly 2. Since the center of gravity C of the platform 4 is located forward of the rotation axis 42 of the platform 4, the platform 4 is stable in this tilted state, and the transported item 20 is held on the platform 4 by the receiving member 43.

[0035] Because the casters 22 of the cart 2 can rotate on a flat surface, the cart 2 can be moved manually in all directions on a flat surface, including the forward and backward directions (see arrow x) and the direction perpendicular to this (see arrow y), with the loading platform 4 tilted, as shown in Figure 4. The cart 2 can move through the passageways of a construction site with the loading platform 4 tilted, making it easy to transport the load 20 even in narrow spaces. Furthermore, even if the space inside a passenger elevator is narrow, the cart can be placed inside the elevator car to move to upper and lower floors.

[0036] If necessary, the transport cart 1 can be lifted up from an upper floor by a hoist (not shown) or the like through an opening 200 in the ceiling, as shown in FIG.

[0037] In this case, for example, the front ends of the dolly 2 and the loading platform 4 are connected to each other with connecting member 40 to fix the loading platform 4, and a hanging member L such as a wire is attached to a lifting jig 50 provided at the front end of the loading platform 4 and a lifting jig 60 provided at the rear end of the dolly 2, and the transport dolly 1 can be lifted upward from the opening 200. The former lifting jig 50 can be attached to a hole 45 (see FIG. 1(b)) in the hanging part 44 of the loading platform 4, and the latter lifting jig 60 can be attached to a hole (hanging part) not shown in the figure in the flange of the girder 21 or connecting member 24 (see FIG. 1(b)) of the dolly 2, but the present invention is not limited to this.

[0038] After moving the transport cart 1 to a predetermined position in this way, the transport cart 1 is temporarily stored, and then the transported goods 20 are unloaded. When unloading goods, as shown in Fig. 6, a tension member T such as a rope attached to an attachment jig 70 provided at the rear end of the platform 4 is hung midway around a tensioner 80 provided at the rear end of the platform 2, and the platform 4 is gradually rotated by the tension of the tension member T so as to approach a horizontal state, while the transported goods 20 is lifted by the hanging member L. The attachment jig 70 can be attached to a hole (not shown) in the flange of the girder 41 of the platform 4, and the tensioner 80 can be attached to a hole (not shown) in the flange of the girder 21 of the platform 4, but this is not limitative.

[0039] After the load 20 has been unloaded, the tension member T is gradually unwound while maintaining tension, and the platform 4 is rotated by its own weight to approach the inclined state shown in FIG. 4, etc. By tilting the platform 4, the transport cart 1 can reduce the stock space required for temporary storage of the load 20 loaded thereon or for storage when not in use. When using the transport cart 1 again, the platform 4 is manually raised to a horizontal position, and a support 5b is attached below the platform 4 to support the platform 4 in a horizontal position, and the load 20 is then loaded as shown in FIG. 2.

[0040] As described above, the transport cart 1 of this embodiment tilts the platform 4 by rotating the platform 4 around the rotation axis 42, allowing the platform 4 to be tilted, enabling the transport of the object 20 on the platform 4 even in narrow spaces such as building corridors or passenger elevators. The location of the rotation axis 42 away from the center of gravity of the platform 4 stabilizes the platform 4 in the tilted state. Furthermore, since the rotation axis 42 at the top of the pillar 3 is positioned in the middle of the platform 4, the platform 4 can be horizontally positioned at a constant height, facilitating loading of the plate-shaped object 20 onto the platform 4 using a forklift truck 10 or the like. Furthermore, gradually shifting the platform 4 from a tilted state to a horizontal state while lifting the object 20 allows the object 20 to be unloaded reliably. As described above, the transport cart 1 of this embodiment allows the plate-shaped object 20 to be transported easily and safely at construction sites and the like.

[0041] In addition, the transport cart 1 of this embodiment has a support pillar 5b that can be attached and detached to the cart 2, and the support pillar 5b attached to the cart 2 can support the loading platform 4 that is arranged horizontally, thereby stabilizing the loading platform 4 in a horizontal state.

[0042] Furthermore, the transport cart 1 of this embodiment can be lifted up using the hoisting member L, and the transport cart 1 loaded with the transported goods 20 can be lifted from an upper floor or the like and moved. Therefore, after unloading the transported goods 20 on a lower floor, it is not necessary to lift the transport cart 1 via stairs or the like and then reload the transported goods 20 onto the transport cart 1 on the upper floor.

[0043] In this embodiment, the claws 101 of the forklift 10 can be passed between the girders 41 of the loading platform 4, allowing the transported goods 20 on the claws 101 to be transferred onto the loading platform 4, facilitating loading of the transported goods 20. Furthermore, the receiving member 43 for the transported goods 20 is provided at the end on the center of gravity C side as viewed from the rotation axis 42 of the loading platform 4, that is, at the lower end when the loading platform 4 rotates under its own weight and becomes tilted, so that the receiving member 43 can lock the transported goods 20 and place it stably on the loading platform 4.

[0044] However, the present invention is not limited to the above embodiment. For example, the transport cart 1 has a cart 2, a pillar 3, and a loading platform 4, and the rotation axis of the loading platform 4 may be located in a middle part of the loading platform 4, excluding both ends, away from the center of gravity C of the loading platform 4, and is not limited to the configuration shown in Fig. 1 etc. For example, the support pillar 5a behind the pillar 3 may be omitted.

[0045] Furthermore, the transportation method using the transport cart 1 is not limited to the above. For example, in the example of Figures 3(a) and (b), the front end of the platform 4 is lowered while the hanging part 44 is suspended from the tines 101 of the forklift 10, but the tines 101 of the forklift 10 may be lowered while supporting the receiving member 43 from below with the tines 101. These methods are reliable and safe because they use the forklift 10, but it is also possible to tilt the platform 4 manually.

[0046] Also, when unloading, as shown in Figure 7, the tension member T, such as a rope, attached to the mounting jig 70 can be hung midway around one or more pulleys 80a provided at the rear end of the cart 2, and the handle of the hoist 90 provided on the transport cart 1 can be turned to wind up the tension member T, gradually rotating the loading platform 4 so that it approaches a horizontal position, while lifting the transported object 20 using the hanging member L.

[0047] After the load 20 has been unloaded, the handle is rotated in the opposite direction to pay out the tension member T while maintaining the tension, and the platform 4 can be gradually rotated by its own weight so as to approach the inclined state shown in Figure 4, etc. The pulley 80a can be attached to a hole (not shown) in the flange of the girder 21 or the connecting member 24 of the bogie 2, and the hoist 90 can be attached to the pillar 3, but this is not limitative.

[0048] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications or alterations within the scope of the technical ideas disclosed herein, and it is understood that these modifications also fall within the technical scope of the present invention. [Explanation of symbols]

[0049] 1: Transport cart 2: Cart 3: Pillar material 4: Cargo bed 5a, 5b: Post 10: Forklift 20: Transported goods 21, 41: Girder material 22: Caster 42: Rotation axis 43: Support material 44: Hanging part 45: Hole

Claims

1. A transport cart for transporting plate-shaped objects, A trolley and A pillar member provided on the carriage; a loading platform attached to the top of the pillar so as to be rotatable in a vertical plane; and A transport cart characterized in that, when viewed in the vertical plane, the rotation axis of the loading platform is located in the middle part of the loading platform excluding both ends and at a position away from the center of gravity of the loading platform.

2. Further, a support column detachable from the carriage is provided.

2. The transporting vehicle according to claim 1, wherein the platform is horizontally disposed and supported by the support columns attached to the vehicle.

3. 2. The transporting cart according to claim 1, further comprising a lifting portion for lifting the transporting cart.

4. The loading platform is A plurality of beams arranged at intervals in a direction perpendicular to the vertical plane; a support member for the transported object provided at an end of each of the plurality of beams located on the center of gravity side as viewed from the rotation axis; and 2. The transporting cart according to claim 1, wherein the transported object is placed on an upper surface of the beam.

5. A method for transporting a plate-shaped object using the transport cart according to claim 1, placing the object on the loading platform in a horizontal position; a step of running the dolly with the loading platform inclined; A transportation method comprising the steps of:

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