JP2004099193A - Sling type lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent accident such that a worker is buried under the fallen work by providing a sling type lifting device having the structure which can avoid the contact with the work by automatic lifting of a lifting tool when the lifting tool is removed from the work. <P>SOLUTION: The lifting tool 5 is connected to the tip of the sling 1 in the sling type lifting device. When the work load is applied on the lifting tool which can lift up its own weight, an elastic member 6 having elastic force in the range which can not lift them, is used, and the elastic member is connected to the two points apart by the distance (L2) of not less than the length (L1) at the time of contraction of the elastic member in the intermediate part of the sling. When lifting the work, the elastic member extends until the distance of approximately the same as the distance (L2) between the connecting points, and the sling becomes in a straight line. However, when the work is removed from the lifting tool, the elastic member contracts and the lifting tool automatically lifts by the distance (L3=L2-L1). <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sling type lifting device in which a hanging tool is connected to a leading end of a sling such as a chain sling, a belt sling, and a wire rope sling.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a sling type lifting device in which a sling such as a chain sling, a belt sling, and a wire rope sling is connected to a lifting device such as a clamp, a shackle, a hook, or the like has been used for lifting a work such as an iron plate or an H-shaped steel. .
[0003]
[Problems to be solved by the invention]
In the lifting work using a conventional sling type lifting device, after the lifted work lands on a predetermined point such as a construction site, the lifting device is removed from the work, and the lifting device is horizontally moved using a crane. In addition, it was necessary to hoist the entire lifting tool with a crane to a height at which the lifting tool did not hit the work, and then move the lifting tool horizontally. If the lifting of the lifting device is insufficient, there is a risk that the lifting device at the lower end of the lifting device will collide with the work and fall down during movement by the crane.
[0004]
Although the operator is familiar with the above operation procedures as common technical knowledge, the work at the site may be rushed too much and may be shifted to horizontal movement with insufficient lifting by the crane. It is the present situation that there are no accidents.
[0005]
[Means for Solving the Problems]
Accordingly, an object of the present invention is to provide a sling type lifting device having a structure capable of solving the above-mentioned problem and automatically lifting the lifting device when the lifting device is removed from the work to avoid contact with the work. .
[0006]
In order to achieve this object, the present invention according to claim 1 is a sling type lifting device in which a hanging tool is connected to a leading end of a sling. When a load of a work is applied to the hanging tool, it is sufficient to lift the weight of the hanging tool. An elastic material having an elastic force in a range in which the elastic material cannot be lifted is used, and the elastic material is connected to two points separated by a distance (L2) which is longer than the contracted length (L1) of the elastic material in the middle of the sling. When the work is lifted, the elastic material stretches until it becomes substantially the same as the distance (L2) between the connection points, and the sling becomes linear. The tool is configured to be automatically raised by a distance (L3 = L2-L1).
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a single-type lifting device using a chain sling as an embodiment of the present invention. A lifting ring 3 is connected to an upper end of a chain sling 1 via a coupling 2, and a coupling 4 is connected to a lower end thereof. A clamp 5 as a hanging tool is connected via a link, and an elastic member 6 is provided at an intermediate portion of the chain sling 1.
[0008]
The elastic member 6 is connected to the chain sling 1 by connecting metal fittings 7 and 8 at two points separated by a distance L2 where L1 <L2, with the length L1 when contracted as a normal state.
[0009]
The elastic force of the elastic member 6 is the own weight of the clamp 5 (more precisely, the load received at the connection point by the connection fitting 8, and in addition to the own weight of the clamp 5, the portion of the chain sling 1 and the cup below the connection point). It is set to a range that is sufficient to lift the ring 4 (total weight of the ring 4) but cannot lift them when a load of a work (not shown) is applied to the clamp 5.
[0010]
Therefore, when a work is lifted by using a crane (not shown) on the suspension ring 3 of the lifting device, the load including the work exceeds the elastic force of the elastic member 6, and the elastic member 6 is substantially equivalent to the distance L2 between the connection points. The chain sling is stretched until it becomes the same, and the chain sling becomes linear (FIG. 8B). However, when the work is moved to a predetermined point such as a construction site and then landed at the point and removed from the clamp 5, elasticity is obtained. Since the elastic force of the material 6 exceeds the load, the elastic material 6 contracts in a normal state (FIG. 3A). For this reason, the clamp 5 is automatically raised by the distance L3 = L2-L1, and interference with the work at the landing point is avoided, so that even if the lifting device is horizontally moved by the crane immediately after the work is lowered, There is no possibility that the worker may be knocked down and the worker may be laid down.
[0011]
FIG. 2 shows a double-type lifting device using a chain sling as another embodiment of the present invention, and a suspension ring 3 is connected to upper ends of two chain slings 1a and 1b via couplings 2a and 2b. A clamp 5a, 5b as a hanging tool is connected to a lower end of each chain sling 1a, 1b via a coupling 4a, 4b, and an elastic member 6a, 6b is provided at an intermediate portion between the chain slings 1a, 1b. Is provided. The operation of this embodiment is substantially the same as the operation of the above-described embodiment of FIG.
[0012]
FIG. 3 shows a single-type lifting device using a belt sling as still another embodiment of the present invention. A hanging ring 12 is connected to an upper end of a belt sling 11, and a clamp 13 as a hanging tool is provided at a lower end thereof. The elastic member 14 is attached to the belt sling 11 at the intermediate portion of the belt sling 11 by sewing portions 15, 15 in a loosened state.
[0013]
The elastic force of the elastic member 14 is sufficient to raise the own weight of the clamp 13 (more precisely, the total weight of the weight of the lower part of the belt sling 11 in addition to the own weight of the clamp 13). ) Are set so that they cannot be lifted when a load is applied.
[0014]
Therefore, when a work is lifted by using a crane (not shown) on the hanging ring 12 of the hanging tool, the load including the work exceeds the elastic force of the elastic member 14, and the elastic member 14 is substantially equivalent to the distance L5 between the connection points. The belt sling is stretched until it becomes the same, so that the belt sling becomes linear (FIGS. (C) and (D)). Then, since the elastic force of the elastic member 14 exceeds the load, the elastic member 14 contracts and relaxes in a normal state (FIGS. 9A and 9B). For this reason, the clamp 13 is automatically raised by the distance L6 = L5−L4, and interference with the work at the landing point is avoided. Therefore, even if the lifting device is horizontally moved by the crane immediately after the work is lowered, There is no possibility that the worker may be knocked down and the worker may be laid down.
[0015]
FIG. 4 shows a double-type lifting device using a belt sling as another embodiment of the present invention. A hanging ring 12 is connected to upper ends of two belt slings 11a and 11b, and each belt sling 11a and 11b is connected to a lifting device. Clamps 13a and 13b are connected to lower ends of the belt slings, and elastic members 14a and 14b are provided at intermediate portions of the belt slings 11a and 11b. The operation of this embodiment is substantially the same as that of the above-described embodiment of FIG.
[0016]
In the above embodiment, the material of the elastic members 6, 6a, 6b, 14, 14a, and 14b is not particularly limited, but it is preferable to use an elastic member made of, for example, a chemical fiber. As an example, a bundle of nylon (trademark) filaments may be shrunk and heat-set (woolly nylon) and sewn to be used as the elastic material of the present invention.
[0017]
Further, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the invention described in the claims. For example, as the sling, a wire rope sling may be used in addition to a chain sling and a belt sling.
[0018]
【The invention's effect】
According to the present invention, in a sling-type hanger in which a hanger is connected to the tip of the sling, an elastic force in a range that is sufficient to lift the own weight of the hanger but cannot lift them when a load is applied to the hanger. Since the elastic member having the following structure is used, the elastic member is connected to two points separated by a distance (L2) which is longer than the contracted length (L1) of the elastic member in the middle part of the sling. The elastic material is stretched until it becomes substantially the same as the distance between connection points (L2), and the sling becomes linear. However, when the work is removed from the suspending device, the elastic material contracts to move the suspending device over the distance (L3 = L2-L1) is automatically raised. As a result, it is possible to prevent the hanging tool from interfering with the work at the landing point, and when the hanging tool is horizontally moved by the crane immediately after the work is unloaded, the work may fall down and the worker may be placed underneath. It is prevented beforehand.
[Brief description of the drawings]
FIG. 1 is a front view showing a single type hanging tool using a chain sling as one embodiment of the present invention, wherein (A) shows a state when a work is released, and (B) shows a state when a work is lifted. FIG.
FIGS. 2A and 2B are front views showing a double-type hanging tool using a chain sling as another embodiment of the present invention, wherein FIG. 2A is a state when a work is released, and FIG. FIG.
FIG. 3 is a view showing a single-type hanging device using a belt sling as still another embodiment of the present invention, wherein (A) and (B) are a front view and a side view showing a state when a workpiece is released. , (C) and (D) are a front view and a side view showing a state when the work is lifted.
FIGS. 4A and 4B are front views showing a double-type hanging tool using a belt sling as still another embodiment of the present invention, wherein FIG. 4A shows a state in which the work is released, and FIG. It is a figure showing a state.
[Explanation of symbols]
1, 1a, 1b Chain sling 2, 2a, 2b Coupling 3 Suspension ring 4, 4a, 4b Coupling 5, 5a, 5b Clamp (hook)
6, 6a, 6b Elastic material 7, 7a, 7b Connecting fitting 8, 8a, 8b Connecting fitting 11, 11a, 11b Belt sling 12 Suspension ring 13, 13a, 13b Clamp (suspension)
14, 14a, 14b Elastic material 15 Sewing part

Claims (1)

In a sling type lifting device in which a sling is connected to the tip of the sling, an elastic material having an elastic force in a range sufficient to lift the weight of the sling but not capable of lifting the work when a load is applied to the sling is used. In the middle part of the sling, the elastic member is connected to two points separated by a distance (L2) which is longer than the contracted length (L1) of the elastic member, and when the work is lifted, the elastic member is connected to the connection point distance (L2). ) Is stretched until the sling becomes substantially the same as that of (1), but when the work is removed from the hanging tool, the elastic material contracts and the lifting tool is automatically raised by the distance (L3 = L2-L1). A sling type lifting device characterized by being configured as described above.

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