Roller device for transporting heavy objects

Abstract

Provided is a roller device for transporting heavy objects, which has a lower overall height than conventional roller devices for transporting heavy objects and can keep the overall height low even when a top plate for placing heavy objects is provided. 【Solution means】 A roller device 10 for transporting heavy objects, which is used to carry and transport heavy objects, includes a thick plate-shaped main body frame 11 having a plurality of openings 11c, and a plurality of tires 12 provided across the openings. The overall height H1 from the floor surface is set to be 24 mm or more and 28 mm or less. When a top plate 13 is provided, the upper surface of the main body frame has a step dug down by 1.0 mm or more and 2.0 mm or less in a circular shape into which the top plate fits.

Description

Technical Field

[0001] The present invention relates to a roller device for transporting heavy objects, which is used for loading and transporting heavy machines and the like.

Background Art

[0002] When loading and unloading heavy objects such as heavy machines in a factory or the like, the heavy object is placed on a roller device for transporting heavy objects and carried. FIG. 3 is a diagram showing a general transportation situation of a heavy object. Outside the factory 60, an iron plate 30 is laid on a roadbed stacked with blocks 40 or the like, and a roller 100 for transporting heavy objects with a heavy object 50 placed thereon is moved. A general heavy object transportation device 100 used here is provided with tires on a frame, and some of these heavy object transportation devices 100 are provided with a handle and moved manually, and some utilize the driving force of a motor as described in Patent Document 1.

[0003] Here, when the height of the factory entrance is low and the building and the heavy object may come into contact even by a few millimeters, it may be necessary to abandon the loading of the heavy object. Therefore, it is desirable to prepare a roller device for transporting heavy objects with a lower overall height as much as possible.

[0004] In order to reduce the overall height of the roller device for transporting heavy objects, for example, it is considered that the diameter of the tire can be reduced or the thickness of the main body frame can be made thinner. FIG. 4 shows a conventional roller device for transporting heavy objects having a top plate, where (a) is a perspective view and (b) is a front view. This conventional roller device 80 for transporting heavy objects has four openings 81c in the main body frame 81, and tires 82 are provided in the openings 81c. The overall height H2 from the lower end of the tire 82 to the upper surface of the top plate 83 is generally about 35 mm. Here, when the thickness of the main body frame 81 of this roller device 80 for transporting heavy objects is made thinner, there is a concern that the main body frame 81 may break or bend due to the load of the heavy object, and simply thinning it to reduce the overall height H2 will make it unable to withstand the load.

Prior Art Documents

Patent Document

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In view of such circumstances, the present invention relates to a roller device for transporting heavy objects, and an object thereof is to provide a roller device having a lower overall height than conventional roller devices.

Means for Solving the Problems

[0007] The roller device for transporting heavy objects according to the present invention is a roller device for transporting heavy objects used for placing and transporting heavy objects, and includes a plate-shaped main body frame having a plurality of openings, and a plurality of tires provided across the openings, and the overall height of the roller device for transporting heavy objects from the floor surface is set to be 24 mm or more and 28 mm or less.

[0008] Here, a top plate that is disk-shaped and rotatable about its central position is provided on the upper surface side of the central portion of the main body frame, and it is preferable that the upper surface of the main body frame has a step that is dug down 1.0 mm or more and 2.0 mm or less in a circular shape into which the top plate fits. Further, it is preferable that the central axis of the tire closest to the central position of the top plate passes below the top plate.

Effects of the Invention

[0009] According to the present invention, there is an effect that the overall height can be reduced by 7 mm or more compared to the conventional roller device for transporting heavy objects having the lowest overall height. Furthermore, even when a top plate is provided, the overall height can be suppressed by digging down the main body frame into a shape into which the top plate fits. In addition, since the central axis of the tire passes below the top plate, the axial interval of the tires can be narrowed, and the deflection of the main body frame can be suppressed, so that the main body frame can be made thinner and the overall height can be suppressed.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0011] The present invention is a roller device for transporting heavy objects used for placing and transporting heavy objects, and it is lower in overall height than conventional ones. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0012] FIG. 1 shows a roller device for transporting heavy objects provided with a top plate, where (a) is a perspective view, (b) is a front view, and (c) is an enlarged sectional view taken along A-A. The roller device 10 for transporting heavy objects of the present invention basically comprises a main body frame 11 and a plurality of tires 12 attached to an opening 11c of the main body frame 11. Generally, a top plate 13 that is disk-shaped and rotatable about its central position is provided on the upper surface side of the central part of the main body frame 11, and a handle attachment part 15 is provided outside the main body frame 11. When moving the roller device 10 for transporting heavy objects, a handle is attached to the handle attachment part 15, and the handle is pushed or pulled to move the roller device 10 for transporting heavy objects with a heavy object placed thereon.

[0013] The main body frame 11 is made of a thick plate-shaped metal member, and has a shape in which a handle attachment portion 15 is provided at the front and rear positions in the traveling direction on the outer periphery of a substantially rectangular shape. Inside the substantially rectangular shape, a vertical frame 11a in the traveling direction and a horizontal frame 11b orthogonal thereto are connected so as to intersect at the center. In other words, it has a shape like the Chinese character "field". That is, it has a shape with four through openings 11c in the thick plate material.

[0014] The roller device 10 for transporting heavy objects shown in Fig. 1 is assumed to have a load-bearing capacity of 2.4 tons, and has a structure in which three tires 12 are attached to one opening 11c. The main body frame 11 is not limited to this shape, and depending on the load-bearing capacity, there may be cases where more than four openings 11c are provided, for example, six openings, and the number of tires can also be increased or decreased.

[0015] The tire 12 is basically a urethane tire, and the tire 12 is provided across the opening 11c in each opening 11c. "Provided across the opening 11c" means a structure in which the central axis 12a of the tire is connected to the outer periphery of the main body frame 11 and the respective side surfaces of the vertical frame 11a. By adopting such a structure, all the tires 12 are accommodated inside the opening 11c, and the lower end of the tire 12 protrudes slightly below the main body frame 11 and contacts the floor surface. The protruding amount of the tire 12 is determined so that the main body frame 11 does not contact the ground in consideration of the deformation amount of the tire 12 when a specified heavy object is loaded.

[0016] The tire 12 used in the roller device 10 for transporting heavy objects of the present invention can be 23φ. For the tire 12, if a reinforced urethane tire is used as the material, the diameter can be made smaller than that of the conventional one. Also, for the main body frame 11, a material with higher strength than the conventional one is used, and the vertical frame 11a and the horizontal frame 11b are made thicker than the conventional ones to suppress deflection, and can be made thinner than the conventional frame.

[0017] When transporting heavy objects by placing them on the roller device, the top plate 13 facilitates changing the direction of travel. As the material for the top plate 13, it is advisable to use a stainless steel corrugated plate. This is because by using a stainless steel corrugated plate, a plate with a thickness of 2.5 mm can be used, which can be made thinner than the 4.5 mm steel plate conventionally used. Also, since it is a corrugated plate, an anti-slip effect when placing heavy objects can be expected. Further, the shape of the top plate 13 is a disc shape of about 145φ, and its rotation axis is basically attached to the central position of the main body frame 11.

[0018] Here, the conventional top plate 13 is provided on the upper surface of the main body frame 11. However, in that case, the height of the main body frame 11 is increased by the gap between the thickness of the top plate 13 and the upper surface of the main body frame 11. Therefore, in the present invention, as shown in FIG. 1(c), a step 14 is provided on the upper surface of the main body frame 11, which is dug down to a circular shape into which the top plate 13 fits, with a depth of 1.0 mm or more and 2.0 mm or less. Specifically, the step 14 is provided on the vertical frame 11a and the horizontal frame 11b, and the depth of the step 14 is determined so that the upper surface of the top plate 13 is higher than the upper surface of the main body frame 11 and the lower surface of the top plate 13 does not contact the tire 12. This can suppress the height added to the upper side from the main body frame 11.

[0019] When a heavy object is loaded and the main body frame 11 deflects, problems may occur such as the main body frame 11 contacting the floor surface, the top plate 13 not rotating smoothly, or the tire 12 located at a position far from the center of the main body frame 11 floating. Therefore, it is advisable that the central axis 12a of the tire 12 closest to the central position of the top plate 13 passes under the top plate 13. Specifically, the distance r from the center of the main body frame 11 to the central axis 12a of the tire 12 is made smaller than the radius R of the top plate 13. By defining it in this way, it is possible to suppress the widening of the interval 2r between the tires 12 located at the position closest to the center of the main body frame 11 and prevent the deflection of the main body frame 11.

[0020] As described above, by devising the materials, shapes, etc. of the main body frame 11, tires 12, and top plate 13, the overall height H1 of the heavy object transporting roller device 10 from the floor surface can be made 28 mm or less. This is 7 mm or more lower than the height H2 of the conventional heavy object transporting roller device.

[0021] As another example, there is also a heavy object transporting roller device without a top plate. FIG. 2 is a perspective view of the heavy object transporting roller device without a top plate. This heavy object transporting roller device 20 has the same basic configuration as the heavy object transporting roller device 10 shown in FIG. 1 except that it does not use a top plate, and includes a main body frame 11 and tires 12. By using two horizontal frames 11b, six openings 11c are provided, but this is only to determine the number of tires 12 according to the load-bearing capacity, and the vertical frame 11a and the handle mounting portion 15 have the same configuration. Note that this heavy object transporting roller device 20 is assumed to have a load-bearing capacity of 3.6 tons.

[0022] When there is no top plate in this way, although the overall height can be suppressed, a large force is required to change the traveling direction when a heavy object is placed, and the transportation work becomes difficult. Therefore, the one without a top plate is a heavy object transporting roller device used in a special scenario where the height limit is particularly strict and the heavy object must pass through.

Explanation of Reference Numerals

[0023] 10, 20 Heavy object transporting roller device 11 Main body frame 11a Vertical frame 11b Horizontal frame 11c Opening 12 Tire 12a Central axis of the tire 13 Top plate 14 Step 15 Handle mounting portion 30 Iron plate 40 Block 50 Heavy object 60 Factory Roller device for transporting 100-weight objects Overall heights H1 and H2

Claims

1. A roller device for transporting heavy objects, which is used for loading and transporting heavy objects, comprising a plate-shaped main body frame having a plurality of openings, and a plurality of tires provided across the openings, wherein the overall height of the roller device for transporting heavy objects from the floor surface is 24 mm or more and 28 mm or less. A roller device for transporting heavy objects is characterized by this.

2. A top plate that is disk-shaped and rotatable about its central position is provided on the upper surface side of the central portion of the main body frame, and the upper surface of the main body frame has a step that is recessed by 1.0 mm or more and 2.0 mm or less in a circular shape into which the top plate fits. The roller device for transporting heavy objects according to claim 1 is characterized by this.

3. The roller device for transporting heavy objects according to claim 2, wherein the central axis of the tire closest to the central position of the top plate passes under the top plate.

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