JP7351026B2 - Lifting tool and lifting tool assembly - Google Patents

Description

The present application relates to a lifting tool and a lifting tool assembly used when lifting a power distribution board or the like.

When placing a switchboard or the like in a predetermined position, the casing of the switchboard is lifted and moved using a crane or the like, but in order to protect the casing from the load applied during lifting and to make the lifting work safe and smooth, Patent Document 1 A lifting device as shown is used.

The lifting tool shown in Patent Document 1 has a hanging bolt on which a wire of a crane is hung, a U-shaped engaging part that supports a member to be lifted, and a hanging bolt and the engaging part separated by a predetermined distance. and a connecting part that connects them together.

Utility Model Publication No. 4-23767

However, since the conventional lifting tool described in Patent Document 1 has a structure in which the member to be lifted is supported from below, there is a risk that the lifting tool may fall off due to its own weight during the installation work.
Furthermore, since the lifting tool has a complicated shape, it is necessary to connect each member together by welding or the like, which has the disadvantage of increasing manufacturing costs.

The present application was made in order to solve the above-mentioned problems, and aims to provide a lifting tool that eliminates the fear of falling off during lifting operations and reduces manufacturing costs. .

The lifting device disclosed in the present application includes a lower plate that receives the lower surface of a frame of a member to be lifted, an upper plate that faces the lower plate, and a side plate that connects the lower plate and the upper plate, and the lifting device as a whole includes The lifting tool is formed in a horizontal U-shape, and is characterized in that the lower plate is provided with an attachment hole for attaching the lifting sling, and the upper plate is provided with a through hole through which the lifting sling is passed.

According to the lifting tool disclosed in the present application, the manufacturing cost is low, and the fear of falling off during lifting work can be eliminated.

1 is a perspective view showing the configuration of a lifting tool according to Embodiment 1. FIG. FIG. 2 is a perspective view showing how the lifting tool according to the first embodiment is used. FIG. 3 is a sectional view of a main part taken along line AA in FIG. 2. 4(A) and 4(B) are perspective views showing the configuration of a lifting tool according to the second embodiment. FIG. 7 is a perspective view and an enlarged view of essential parts showing the usage state of the lifting tool according to the second embodiment. FIG. 7 is a schematic diagram for explaining the usage state of the lifting tool according to the second embodiment. FIG. 7 is a perspective view showing another configuration of the lifting tool according to the second embodiment. FIG. 7 is a perspective view showing the configuration of a lifting tool according to Embodiment 3; FIG. 7 is a perspective view showing a usage state of the lifting tool according to Embodiment 3; FIG. 7 is an exploded perspective view showing the configuration of a lifting tool assembly according to a fourth embodiment. FIG. 7 is a perspective view showing an assembled state of a lifting tool assembly according to a fourth embodiment. FIG. 7 is a perspective view showing a usage state of the lifting tool assembly according to Embodiment 4;

Hereinafter, a lifting tool and a lifting tool assembly according to an embodiment of the present application will be described using the drawings.

Embodiment 1.
FIG. 1 is a perspective view showing the configuration of a lifting tool according to Embodiment 1 of the present application.
In the figure, the lifting tool 1 consists of a lower plate 1a that receives the lower surface of a frame of a casing housing a lifted member such as a power distribution board, an upper plate 1b facing the lower plate 1a and protruding toward the free end, and a lower part. It is composed of a side plate 1c that connects a plate 1a and an upper plate 1b, and is formed in a horizontal U-shape as a whole.
Further, a mounting hole 1d is provided in the center of the lower plate 1a, and a through hole 1e is provided in the upper plate 1b, which is located closer to the free end than the mounting hole 1d.
Such a lifting tool 1 can be easily manufactured by press-forming a steel material, and can also be manufactured at low cost by casting, forging, or resin molding.

2 and 3 show a working state in which a casing, which is a member to be lifted, is lifted using such a lifting tool 1, and FIG. 3 shows a cross section of a main part as seen from line AA in FIG. There is.
When lifting the casing 2, first, the U-shaped portions of the four lifting tools 1 are inserted from the sides into the four corners of the upper casing frame 2a that forms the outer shell of the casing 2. At this time, since the horizontal U-shaped part of the lifting tool 1 is inserted into the housing frame 2a from the side, the upper plate 1b of the lifting tool 1 is locked to the upper surface of the housing frame 2a, and the lifting tool 1 will not fall off due to its own weight.

Next, pass the shackle 3a at the tip of the lifting sling 3, which is attached to a crane or the like, through the through hole 1e provided in the upper plate 1b of the lifting tool 1, and insert it into the mounting hole 1d provided in the lower plate 1a of the lifting tool 1. Link.
Here, the mounting hole 1d is arranged close to the housing frame 2a and is sized to allow the shackle 3a to be attached, and the through hole 1e is sized to allow the shackle 3a to be inserted therethrough. Since the lifting sling 3 is pulled diagonally toward the center of the housing 2 during lifting, the lifting sling 3 is formed to be displaced from the center of the mounting hole 1d toward the free end.

Therefore, when hoisting the casing 2 with a crane, the casing 2 is lifted by pulling the lifting sling 3 in the direction of the dotted line as shown in FIG. The load is distributed on the lower surface 2b and side surface 2c of the casing frame 2a that are in contact with the casing frame 2a, thereby reducing the burden on the casing frame 2a.
As described above, the lifting tool 1 of Embodiment 1 has the advantage of being inexpensive and preventing falling off due to its own weight during lifting work.

Embodiment 2.
4(A) and 4(B) are perspective views showing the configuration of a lifting tool according to the second embodiment.
During lifting work, the lifting tools 1 are placed at the four corners of the rectangular housing frame 2a, and the lifting slings 3 attached to these four lifting tools 1 are focused on the crane located above the center of the housing 2. Therefore, the through hole 1e of the upper plate 1b is formed into a long hole shape that is inclined in the diagonal direction of the upper plate 1b toward the center of the housing 2, that is, toward the lifting tool 1 located diagonally. There is.
Here, as shown in FIG. 5, the elongated through hole 1e is wide enough to allow the shackle 3a to pass through, and has a length such that the lifting sling 3 comes into contact with the inner surface 1f on the free end side of the through hole 1e during lifting. It is set as follows.

That is, in the lifting tool 1, since the housing frame 2a is laterally attached between the U-shaped lower plate 1a and the upper plate 1b, it is necessary to secure a clearance to the housing frame 2a. The tool 1 does not come into complete contact with the housing frame 2a, and the point where the lifting force is applied to the lifting tool 1 is separated from the point of action that receives the weight of the housing frame 2a.
As a result, as shown in FIG. 6, rotational torque is generated in the housing frame 2a, but by bringing the lifting sling 3 into contact with the inner surface 1f of the free end side of the through hole 1e, rotational torque is generated in the opposite direction to the rotational direction. A supporting force is generated, the rotational torque applied to the housing frame 2a can be reduced, and the torsional load applied to the housing frame 2a can be suppressed.

Furthermore, by making the width of the elongated through hole 1e small enough to allow the shackle 3a to pass through, it becomes possible to limit the degree of freedom of the lifting sling 3 during lifting, and stable lifting work can be performed. .
In addition, as shown in FIG. 7, by forming the elongated through hole 1e in a V-shape, the hole facing toward the center can be located no matter which of the four corners of the housing frame 2a is attached. This has the advantage that one type of lifting tool 1 can be used in common.

Embodiment 3.
FIG. 8 is a perspective view showing the configuration of a lifting tool according to Embodiment 3.
In the above-described embodiment, since the lower plate 1a of the lifting tool 1 is lifted up diagonally from above via the lifting sling 3, the mounting position of the lifting tool 1 causes the casing frame 2a to slip in the lateral direction, causing the casing frame to slide. 2a etc. may be damaged.
For this reason, in Embodiment 3, an L-shaped bent piece 1g that protrudes from the side surface of the upper plate 1b in the x-axis direction and is bent toward the lower plate 1a is added.

When lifting the housing 2 using such a lifting tool 1, as shown in FIG. 9, the U-shaped part of the lifting tool 1 is inserted from the outer periphery of the housing frame 2a, and the By bringing the bent piece 1g into contact with the back surface, it is possible to prevent the force in the x-axis direction from being applied to the lifting tool 1, and it is possible to prevent the casing frame 2a from sliding in the lateral direction. The surface of the frame 2a will not be damaged.
Furthermore, compared to the case where the lifting tool 1 according to the first embodiment is used, a component of the lifting force is applied to the front or rear side of the casing 2 due to the bent piece 1g, so that the lifting force applied to the lifting tool 1 is reduced. The load will be distributed.
Note that it is necessary that the direction of the protruding side surface of the bent piece 1g differs depending on the mounting position of the lifting tool 1 in the housing 2.

Embodiment 4.
FIG. 10 is an exploded perspective view showing the configuration of a lifting tool assembly according to Embodiment 4.
In the figure, the lifting tool 1 is further provided with a bent piece 1h formed by bending one side of the free end side of the upper plate 1b upward, which forms a horizontal U-shape, and a groove 1j is provided in the middle part of this bent piece 1h. It consists of On the other hand, such a lifting tool 1 is provided with an L-shaped reinforcing plate 10 that engages with the groove 1j of the bent piece 1h, and at both ends of this reinforcing plate 10 there are slits 10a through which the bent piece 1h is inserted. It is provided.

As shown in FIG. 11, a pair of lifting tools 1 are combined at both ends of such a reinforcing plate 10 to form a lifting tool assembly.
Note that the reinforcing plate 10 can be easily manufactured by bending a flat plate into an L-shape by pressing or the like.

FIG. 12 is a perspective view showing the usage state of the lifting tool assembly.
First, as in the first embodiment, four lifting tools 1 are inserted into the four corners of the housing frame 2a from the lateral direction, and then the grooves 1j are inserted from above the bent pieces 1h of the two opposing lifting tools 1. The pair of lifting tools 1 are connected by inserting them into each other using the slits 10a of the reinforcing plate 10.
Thereafter, the shackle 3a of the lifting sling 3 is connected to the lifting tool 1, and the other end of the lifting sling 3 is connected to a crane to perform lifting work of the housing 2.

According to such a lifting tool assembly, by using the reinforcing plate 10, it is possible to prevent the two lifting tools 1 from falling off from the housing frame 2a before lifting the housing 2, and also, During lifting work, the L-shaped main body portion of the reinforcing plate 10 can reinforce the possibility that the housing frame 2a will be compressed and curved, and the bending pressure on the housing frame 2a can be reduced.

In Embodiment 4, the bent piece 1h is provided on one side of the free end side of the upper plate 1b to connect the two opposing lifting tools 1, but the bent piece 1h is provided on one side side and is Two lifting tools 1 arranged in parallel in the x-axis direction may be connected by a reinforcing plate 10, thereby making it possible to reinforce the housing frame 2a in the x-axis direction. In addition, the bent pieces 1h can be provided on the free end side and the side sides, thereby making it possible to reinforce the housing frame 2a in the x-axis direction and the y-axis direction.

Further, the reinforcing plate 10 is not limited in shape or material as long as it can perform the function of connecting the two lifting tools 1 and supporting the lifting tools 1.

Although this application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments may be specific to the specific embodiments. The present invention is not limited to application, but can be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, this includes cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of other embodiments.

1: Lifting tool, 1a: Lower plate, 1b: Upper plate, 1c: Side plate, 1d: Mounting hole, 1e: Through hole, 1g: Folded piece, 1h: Folded piece, 1j: Groove, 2: Housing, 2a : Housing frame, 3: Lifting sling, 3a: Shackle, 10: Reinforcement plate, 10a: Slit

Claims (6)

A lifting device that is formed into a horizontal U-shape as a whole, and consists of a lower plate that receives the lower surface of the frame of the member to be lifted, an upper plate that faces the lower plate, and a side plate that connects the lower plate and the upper plate. A tool,
A lifting tool, characterized in that the lower plate is provided with an attachment hole for attaching the lifting sling, and the upper plate is provided with a through hole through which the lifting sling is passed. 2. The lifting tool according to claim 1, wherein the through hole of the upper plate is arranged on the free end side with respect to the attachment hole of the lower plate. 3. The lifting tool according to claim 1, wherein the through hole of the upper plate is formed into an elongated hole shape inclined in a diagonal direction. 3. The lifting tool according to claim 1, wherein the through hole of the upper plate is a V-shaped elongated hole. The lifting tool according to any one of claims 1 to 4, further comprising an L-shaped bent piece that protrudes from the side surface of the upper plate and is bent toward the lower plate. A lifting device characterized by being equipped with. The lifting tool according to any one of claims 1 to 5, further comprising: bending at least one side of the upper plate of the lifting tool upward and providing a bent piece with a groove in the middle part; An L-shaped reinforcing plate that engages with the groove of the bent piece and has slits at both ends through which the bent piece is inserted is provided for the two lifting tools, and the two lifting tools and the reinforcing plate A lifting device assembly characterized by combining the following.

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