Transport cart

Abstract

To provide a transport cart capable of safely moving and transporting a heavy object such as a long steel workpiece after lifting it.SOLUTION: A transport cart comprises a movable platform 1, lifting means 4 provided on the platform 1 and capable of lifting a heavy load M, and a support arm 5 provided on the platform 1 so as to be able to advance below the lifted heavy load M. The transport cart is capable of lowering the lifted heavy load M onto the extended support arm 5 and placing it thereon.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a transporting cart, and more particularly to a transporting cart equipped with a lifting means for lifting a heavy load. [Background technology]

[0002] An example of this type of transport cart is shown in Patent Document 1, which has a U-shaped base in a plan view with rear wheels in the center and front wheels at both ends to enable movement, and a lifting arm capable of lifting heavy objects is attached to the top end of a support pillar erected in the center of the base, allowing the cart to move and transport heavy objects while they are lifted by the lifting arm. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2001-31383 Summary of the Invention [Problem to be solved by the invention]

[0004] However, it is difficult to lift heavy objects such as long steel workpieces using the above-mentioned lifting arm, and moving such heavy objects while they are lifted is dangerous because the heavy objects will swing violently due to their inertia when the transport cart stops moving.

[0005] SUMMARY OF THE INVENTION The present invention is intended to solve such problems and aims to provide a transport cart that can safely move and transport heavy objects such as long steel workpieces after lifting them. [Means for solving the problem]

[0006] In order to achieve the above object, the first invention comprises a movable platform (1), a lifting means (4) provided on the platform (1) capable of lifting a heavy object (M), and a support means (5) provided on the platform (1) capable of advancing below the lifted heavy object (M), so that the lifted heavy object (M) can be lowered and placed on the advanced support means (1).

[0007] In the first invention, the heavy object is suspended and placed on the extended support means during transport, so that it does not sway significantly due to its inertia when the transport cart stops moving, etc., and can be moved and transported safely.

[0008] In the second invention, the frame (1) is formed in a gate shape when viewed from the front, and a mobile carriage (2) attached to the lower end of the longitudinal beams (11) at both ends in the width direction can run on parallel rails (3).

[0009] According to the second aspect of the present invention, the gantry can be easily moved.

[0010] In the third aspect of the present invention, the support means is composed of a plurality of arm bodies (5) that can be rotated horizontally and advanced.

[0011] According to the third aspect of the present invention, the advancing and retreating support means can be realized with a simple configuration.

[0012] The symbols in parentheses above indicate, for reference, the correspondence with specific means described in the embodiments to be described later. [Effects of the Invention]

[0013] As described above, the transport cart of the present invention can lift a heavy object such as a long steel workpiece and then safely move and transport it. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. 1 is an overall plan view of a transport cart; [Figure 4] FIG. 10 is a plan view of the main parts of the transport cart with the support arms retracted. [Figure 5] FIG. 10 is a plan view of the main parts of the transport cart with the support arms extended. [Figure 6] FIG. 1 is a front view of the entire transport cart with a heavy load lifted and the support arms extended. [Figure 7] FIG. 10 is a front view of the entire transport cart with a heavy object suspended and placed on the extended support arm. DETAILED DESCRIPTION OF THE INVENTION

[0015] The embodiments described below are merely examples, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

[0016] Fig. 1 shows a front view of the transport vehicle V of the present invention, Fig. 2 shows a side view of the transport vehicle V, and Fig. 3 shows a plan view thereof. The transport vehicle V has a gate-shaped base 1 when viewed from the front, and the lower ends of each vertical beam 11 located at the four corners of the base 1 (left, right, front, and rear) are supported on a movable vehicle 2 equipped with a motor 21 (Fig. 2). Each movable vehicle 2 is provided with a pair of wheels 22, and these wheels 22 are placed on parallel rails 3 extending in the front-to-rear direction (left-to-right direction in Fig. 2).

[0017] Cross beams 13 are provided at the front and rear positions below the top beam 12 of the pedestal 1, and an electric hoist 4 is provided as a lifting means at the center of each cross beam 13, i.e., at the center of the width of the pedestal 1. Each electric hoist 4 has a known structure and is equipped with a lifting hook 42 at the lower end of a lifting wire 41. The lifting hook 42 is equipped with a sensor (not shown) that detects when no load is being lifted.

[0018] Cylindrical shaft members 51 are rotatably supported in a vertical position near the lower ends of the vertical beams 11 at the four corners of the frame 1, and support arms 5 serving as support means have their base ends fixed in a horizontal position to each of these shaft members 51. The support arms 5 are long plates that, when viewed from the side, have a wedge shape that gradually narrows toward the tip (see Figure 6), and the upper surface thereof is a horizontal plane of a constant width.

[0019] A drive cylinder 6 is provided between each longitudinal beam 11 and a protrusion 511 (Fig. 3) provided on the outer periphery of each shaft member 51, and when the cylinder rod is extended, the support arm 5 is retracted to a position along the side beam 14 of the pedestal 1 as shown in Fig. 4, ensuring a large, obstacle-free space inside the pedestal 14. When the cylinder rod of the drive cylinder 6 contracts, the support arm 5 is rotated inward around the shaft member 51 as shown by the arrow in Fig. 4, and protrudes into the internal space of the pedestal 1 (Fig. 5).

[0020] When a heavy load M such as a long steel workpiece is transported by a transport vehicle V having such a structure, the transport vehicle V is moved to a position directly above the heavy load M placed between the parallel rails 3 (FIGS. 1 to 3). In this case, the support arms 5 are rotated to the retracted state. After that, wires M1 are looped around the front and rear positions of the heavy load M, and these wires M1 are hooked onto the lifting hooks 42 of the front and rear electric hoists 4. The lifting hooks 42 are then pulled up to lift the heavy load.

[0021] Thereafter, the support arm 5 is rotated inward to be positioned below the heavy load M (Fig. 6), and the heavy load M is lowered onto the support arm 5 (Fig. 7). After a zero load detection sensor confirms that the heavy load M has been securely transferred from the hanging hook 42 onto the support arm 5, the transport cart V is moved along the parallel rails 3 and transported to the required work location.

[0022] During this transport, the heavy load M is placed on the support arm 5, so that it does not sway significantly due to its inertia when the transporting vehicle V stops moving, etc., and can be moved and transported safely.

[0023] In the above embodiment, the stand is a gate type, but the present invention is not limited to this. In the above embodiment, a drive cylinder is used to rotate the support arm, but a manual jack may also be used, or the support arm may be rotated by human power. Furthermore, the support means is not limited to the structure shown in the above embodiment that moves back and forth by rotating horizontally, and does not necessarily have to be an arm body. The structure for moving the transport vehicle is not limited to a moving vehicle with wheels and parallel rails. [Explanation of symbols]

[0024] 1...frame, 2...mobile cart, 3...parallel rails, 4...electric hoist (lifting means), 5...support arm (support means), M...heavy object, V...transport cart.

Claims

1. A transport cart comprising a travellable platform, a lifting means provided on the platform and capable of lifting a heavy object, and a support means provided on the platform and capable of advancing below the lifted heavy object, so that the lifted heavy object can be hoisted down and placed on the advanced support means.

2. 2. The transport vehicle according to claim 1, wherein the platform is formed in a gate shape when viewed from the front, and movable carriages are provided at the lower ends of the longitudinal beams at both ends in the width direction and are capable of running on parallel rails.

3. 3. The transporting cart according to claim 1, wherein the support means is comprised of a plurality of arms that can be rotated horizontally and advanced.

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