JPH0529556Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to an improvement of a buffer spring suitable for retaining an overhead power distribution line, which the applicant provided in Utility Model Application No. 60-95240. The present invention relates to this type of buffer spring equipped with a load display mechanism.

[Prior Art] A buffer spring for an overhead power distribution line is constructed by combining a pair of hooks each having a hook at one end in a link shape at an oblong bent portion, and connecting the hooks between the hooks at both ends within a certain dimension. In addition to variably connecting the dimensions of
It has a structure in which a tightly wound coil spring is installed with a predetermined initial tension set so as to enclose the link portion. Among the buffer springs used for various purposes, including such buffer springs, there are very few that have a mechanism that can display the load applied to the spring body, and in particular, there is a function that can display the maximum load applied in the past. There is no buffer spring with this. Therefore, in most cases, the load that is expected to be applied to the spring body is determined through calculation or experience, and the spring body is manufactured and used based on a desk design.

[Problems that the invention aims to solve] However, when manufacturing a spring body using a desk design, even if you calculate the load, it is easy to over-design to ensure a tolerance range, and experience shows that the spring body may be damaged due to unexpected loads. In many cases, it caused damage to the body and lost its cushioning effect.

Therefore, the purpose of this invention is to create a buffer spring for an overhead power distribution line that can display the current load applied to the spring body as well as the maximum load applied in the past. To provide a buffer spring for an overhead power distribution line with a load display mechanism that makes it possible to detect the load actually applied to a spring body and can serve as a valuable reference when improving the spring.

[Means for solving the problem] In order to achieve the above purpose, the buffer spring according to this invention has a reference point for measuring the load on the rod of the hook,
A display body that is movable along the rod portion and an actuating portion that moves this display body along the rod portion according to the extension of the spring body are realized in a configuration that conforms to the structure of the buffer spring. .

In other words, the buffer spring of this invention combines a pair of hooks each having a hook at one end in a link shape at an oblong bent portion, and connects the hooks at both ends so that the dimensions between the hooks at both ends can be changed within a certain dimension. At the same time,
In a buffer spring for an overhead power distribution line, which is equipped with a closely wound coil spring set to a predetermined initial tension so as to enclose the link part, a reference point for load measurement is provided on the rod part of one hook, and A movable indicator is attached along the rod, and one end is fixed to the rod of the other hook.
The other end of the wire, which was passed through the coil spring and pulled out to the hook side and extended parallel to the direction of extension of the coil spring, was wrapped around the rod between the load measurement reference point and the display body to form the actuating part. It features a buffer spring for an overhead power distribution lead-in line whose actuator can move the display according to the state of extension of the spring.

To read the load, if you attach a scale to the rod of the hook, you can read the movement distance of the display from the load measurement reference point, and it will show the correlation between the predetermined movement distance and the load. This is possible by comparing it with a table.

In addition, if a load measurement card is separately prepared that shows the moving distance of the display body and the corresponding load, the load can be immediately known without providing a scale on the rod.

[Function] The buffer spring of the overhead power distribution lead-in line configured as described above moves the display body pushed by the actuating part along the rod part in accordance with the extension of the spring body, so that the display body does not move. The position always indicates the maximum movement position, that is, the movement position due to the maximum load applied so far. Therefore, by reading the distance traveled by the display, it is possible to know the maximum load to date. Furthermore, by reading the distance from the reference point to the current position of the actuating part, the current load can be determined. Therefore, since it is possible to know the actual load applied to the buffer spring, including the past maximum load, it is possible to avoid over-designing when improving the spring, and to provide a more efficient spring that does not cause damage. It is possible.

[Example] Figures 1 and 2 show an example of a buffer spring for an overhead power distribution lead-in line according to this invention.
The structure of the buffer spring itself is similar to that provided in Utility Model Application No. 60-95240. That is, the fourth
As shown in the figure, a pair of hooks 2, 2' having hooks 1, 1' at one end are combined in a link shape at an oblong bent portion, and the hooks 1, 1 at both ends are combined within a certain dimension. This is a buffer spring in which the dimensions between 1 and 2 are variably connected, and a closely wound coil spring 3 is attached to a predetermined initial tension so as to enclose the link portion.

In this example, the rod portion 4 of the hook 2 is used as an indicator rod, and an E-ring is fixed thereon to serve as a reference point 5 for load measurement, and a scale 6 is attached to the indicator rod itself. 7 is a display body provided movably along the rod portion 4, and uses an E-ring.
Reference numeral 8 denotes an actuating portion attached to the rod portion 4 between the reference point 5 and the display body 7, and is movable along the rod portion. In this example, as shown, one end 9
is fixed to the rod portion 4' of the hook 2', passed through the coil spring 3 and pulled out to the hook 2 side, and the other end of the wire 10 extending parallel to the direction of extension of the coil spring is attached to the rod portion 4. The actuating portion 8 is constituted by winding it.

When both end hooks 1, 1' are pulled and the coil spring expands, the actuator 8 moves the display 7 along the rod portion 4. Since the operating body 8 and the display body 7 move along the rod portion 4 according to the magnitude of the tensile load, the position of the display body 7 will indicate the maximum load applied so far. The currently acting tensile load, which is smaller than this maximum load, is indicated by the position of the actuating part 8.

In the above example, the rod portion 4 is used as the display rod, and the scale 6 is attached to the display rod itself, but as shown in Figure 3, it is read by a load measurement card C prepared in advance. It's okay.

In other words, the reference point A is placed on the card C, and the display body 7
If you display the moving distance (mm) and the corresponding load (Kg), as shown in the figure, align the reference point A of the card C with the load measurement reference point 5, check the moving distance of the display 7, and calculate the corresponding load. By reading the value, you can immediately know the actual load.

[Effects of the invention] As explained above, the buffer spring according to this invention has the following effects:
It has a function that can display not only the currently applied load but also the maximum load applied in the past, so when using it as a buffer spring for an overhead power distribution line, you can immediately know the currently applied load. By checking periodically, it is possible to know the maximum load that has been applied up to that point, making it possible to provide a very effective buffer spring when using or improving the spring.

Adjusting the slack when stopping the overhead power distribution lead-in line was difficult and had to be done through experience, but with this invented buffer spring that has a load display mechanism, the current load can be read immediately, making it easy to adjust the slack. becomes. Furthermore, when abnormal tension is applied, it buffers the tension and displays the maximum load, which allows for spring designs to be tailored to this, and has the advantage of enabling effective reinforcement of support points. There is.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a buffer spring for an overhead power distribution lead-in line according to this invention, and FIG.
FIG. 3 is an enlarged view of the main part showing another embodiment, and FIG. 4 is a front view showing the basic structure of the buffer spring. 1, 1'...Latch part, 2, 2'...Hook, 3...
...Coil spring, 4,4'...Standing part, 5
... Reference point for load measurement, 6 ... Scale, 7 ... Display body, 8 ... Actuation part, 9 ... One end, 10 ... Wire rod, C ... Load measurement card, A ... Reference point.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of hooks 2, 2' having hooks 1, 1' at one end are combined in a link shape at an oblong bent part, and both ends within a certain dimension. While connecting the hook parts 1 and 1' in a variable dimension,
In a buffer spring for an overhead power distribution line, in which a closely wound coil spring 3 is attached with a predetermined initial tension so as to enclose the link part, a reference point 5 for load measurement is attached to the rod part 4 of one hook 2. At the same time, a display body 7 movable along the rod portion 4 is attached, and one end portion 9 is fixed to the rod portion 4' of the other hook 2', passing through the coil spring 3 and attaching it to the hook 2 side. The other end of the wire 10 is pulled out to extend parallel to the direction in which the coil spring 3 extends and is wound around the rod portion 4 between the load measurement reference point 5 and the display 7 to connect the actuating portion 8.
A buffer spring for an overhead power distribution lead-in line in which an actuating part 8 can move a display body 7 according to the expanded state of a coil spring. (2) A buffer spring for an overhead power distribution lead-in line according to claim 1, wherein the rod portion 4 of the hook 2 is provided with a scale 6 for reading the load.