JPH048150Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] When using a sling formed of a chain, wire rope, etc. used for crane slinging work etc. at an angle, the safe lifting that is permissible for the sling is determined. This invention relates to a safe load indicator for a sling that displays the load.

[Conventional technology]

Since transportation by crane is extremely dangerous, various work regulations have been established. Particularly in slinging work, the load must fall, so the load and center of gravity must be set, and the tension may change depending on the sling hanging angle (the angle between the slings when they are hung on a hook), which changes depending on the shape of the load. It was necessary to select an appropriate sling taking these factors into consideration. In particular, the tension changes significantly depending on the hanging angle of this sling, for example, compared to when the hanging angle is θ = 0°,
= 90°, the tension acting on the sling increases by 1.41 times. Therefore, in the past, experienced workers were selected for slinging work, a chart of safe lifting loads determined by the sling angle and sling thickness was posted at the work site, and sling workers were asked to read the sling angle visually. This chart was originally used to set the safe lifting load.

In addition, this type of safe load indicator is used to measure the angle of a slinging rope, in which a semicircular guide displaying the angle and load is removably fixed to the hanging rope, and a pointer pointing perpendicularly is pivoted to the guide by its own weight. The vessel is known.

In addition, an angle measuring device for cargo handling was developed in 1972, which has a structure in which two hanging wires are connected to two hanging wires with attached rods in a detachable manner, an angle indicator plate is attached to one of the hanging rods, and a pointer is attached to the other rod. It is known from Publication No. 61553.

[Problem that the invention attempts to solve]

However, this conventional visual measurement of the hanging angle has a large error, and sling operators often choose slings based on their intuition because they are busy, are not used to it, and there is no chart of safe lifting loads on site. It was a lot.

In addition, conventional rope angle measuring instruments for slinging and angle measuring instruments for cargo handling both have circular scale displays and pointers exposed on the surface, so they are easily damaged by contact with ropes, wires, etc. Furthermore, when storing the measuring instruments and not in use, they must be removed, and when they are to be used, they must be attached to wire ropes, which requires time and effort. Furthermore, since the indicator scales are read using a pointer, they are difficult to read and easy to misread.

[Means for solving problems]

The present invention was devised to solve these conventional problems, and its purpose is to be less susceptible to damage, to be able to store the display with it attached, and to
Moreover, it is an object of the present invention to provide a practical safe load indicator in which the safe load display is easy to understand and can be read reliably. The gist of the present invention is to suspend a slide casing with an indicator window from a detection cable connected to a load cable near the upper suspension fitting of the sling, and to suspend a load display panel movably provided on the slide casing from the upper part. It is hung from the metal fittings, and the load display board has letters or symbols indicating the safe lifting load according to the hanging angle of the sling, so that the slide casing and the load display board are relatively displaced according to the hanging angle. Letters indicating the safe lifting load for that hanging angle from the display window.
The safe load indicator for the sling corresponds to the hanging angle, which is characterized by a visible symbol.

[Effect]

Therefore, in the safe load indicator for a sling that corresponds to the hanging angle of the present invention, since the slide casing is suspended from the load cable using the detection rope, the slide casing and the load cable connected to the upper hanging bracket are determined by the hanging angle of the load cable connected to the upper hanging bracket. The distance to the upper hanging bracket will vary. In addition, since the display panel suspended from the upper hanging fitting is movably provided on the slide casing, the display panel is maintained at a constant distance regardless of the hanging angle of the load cable. Therefore, since the display board moves relative to the slide casing depending on the hanging angle of the load cable, if the safe lifting load is displayed on the load display board according to the hanging angle of the load cable, the hanging angle can be adjusted. Even if the load changes, the safe lifting load can be seen directly. Furthermore, since the structure is simple, it can be attached to existing slings.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. still,
In describing each embodiment, the same reference numerals are used for the same components in the drawings.

1 to 3 show a first embodiment.

The safe load indicator 2 of the sling 1 corresponding to the hanging angle of this embodiment has a slide casing 3, a load indicator 4, and a detection cable 5 as main components.

In the sling 1, the base ends of a link chain 8, which is a load cable, are rotatably connected to both ends of an upper hanging metal fitting 7 provided with a hook hole 6, and a lower hook 9 is provided at the tip of the link chain 8. It is structured as follows.

When in use, the safe load indicator 2 is disposed below the upper hanging metal fitting 7 of the sling 1, and is connected to the third link 10 from the base end of the link chain 8 to each of the small link chains 5, which are detection cables. The base end is locked, and the tips of the small link chain 5 are locked at both upper ends of the slide casing 3. The slide casing 3 has a guide groove 11 inside, and a display window 12 and a base line 13 at the center of the front surface.

Next, the load display board 4 has a numerical value 15 representing the load written on its surface 14, and its upper part is locked below the upper hanging bracket 7 by an interlocking mechanism 16, and is slidably inserted into the guide groove 11 of the slide casing 3. be done. Further, the numerical value 15 is displayed on the display window 12.
In addition, 17 is the hanging angle θ, and 18 is the small link chain 5.
Indicates the opening angle of the comrades.

This embodiment is configured as described above, and the opening angle 18 of the small link chain 5 changes depending on the degree of opening of the hanging angle θ17 of the link chain 8. Therefore, for example, as the hanging angle θ increases, the opening angle 18 also becomes larger, so the upper hanging fitting 7 and the slide casing 3 become closer together. On the other hand, the load display panel 4 that is locked to the upper hanging fitting 7 by the linkage mechanism 16 maintains a constant distance from the upper hanging fitting 7 regardless of the degree of opening of the hanging angle θ17. The numerical value 15 displayed on the display window 12 will be relatively up and down.
will change one after another. Therefore, the numerical value 15 is displayed in accordance with the safe lifting load for the hanging angle θ17 of the link chain 8, so the sling operator can safely lift the sling in use by simply reading the numerical value 15 appearing on the display window 12. You can know the load instantly.

Next, FIG. 4 shows a second embodiment, in which the load display board 4 is disc-shaped and shows a number 1 representing the load on the periphery of the plane.
5 is entered. Further, the slide casing 3 is provided with a display window 12 that accommodates the load display board 4 therein and displays a numerical value 15, and the detection cable 5, which is locked to the load cable 8, displays the load display panel 4 according to the hanging angle of the load cable 8. The feature is that the corresponding numerical value 15 is displayed on the display window 12 by rotating the slide casing 3.

FIG. 5 shows a third embodiment, and this embodiment is different from the slide casing 3 in the second embodiment described above.
is fixed, and the load display panel 4 is rotated to display the corresponding numerical value 15 on the display window 12.

Although each embodiment of the present invention has been described above with reference to drawings, the specific configuration of the present invention is not limited to these embodiments, and design changes may be made without departing from the gist of the invention. It is included in the technical scope of the present invention.

For example, although the load rope has been described as a link chain with eight links, the number of links is not limited to this, and wire ropes, belts, etc. may also be used. In addition, although the load is expressed numerically, it is not limited to this, it may be displayed in different colors, or it may be displayed by the length of the load display panel going in and out from the slide casing without displaying the numerical value in the small window. good.

[Effect of idea]

As described above, the present invention has the advantage that, by adopting the configuration as described above, the safe lifting load can be accurately displayed based on the hanging angle of the sling, while the structure is simple.

In addition, in this invention, a weight display board is provided inside the slide casing, and the slide part is protected inside, so it is less likely to be damaged by contact with wires, ropes, chains, etc., and there are fewer failures during use. This is convenient because it can be stored with it attached. Furthermore, since the display is read by reading the characters and symbols on the weight display panel visible in the display window of the slide casing, it has the advantage of being easy and reliable.

[Brief explanation of the drawing]

Figure 1 is a front view showing the safe load display of a sling with a small hanging angle according to the first embodiment of the present invention, Figure 2 is a partial front view showing the same when the hanging angle is larger than that in Figure 1, and Figure 3. FIG. 4 is a partial front view showing the case where the hanging angle is larger than that in FIG. 2, FIG. 4 is a front view showing the second embodiment, and FIG. 5 is a front view showing the third embodiment. 1...Sling, 2...Safe load indicator, 3...
...Slide casing, 4...Load display panel, 5...
...Small link chain (detection cable), 7... Upper hanging metal fitting, 8... Link chain (load cable), 17... Hanging angle (θ).

Claims (1)

[Scope of utility model registration request] A slide casing with an indicator window is suspended by a detection cable connected to a load cable near the upper hanging bracket of the sling, and a load display panel movably provided on the slide casing is suspended from the upper hanging bracket. Letters or symbols indicating the safe lifting load according to the hanging angle of the sling are attached to the load display panel, and the slide casing and the load display panel are relatively displaced according to the hanging angle, and the display window shows the hanging angle. A safe load indicator for a sling that corresponds to the lifting angle, characterized by visible letters and symbols indicating the safe lifting load.