Cable-gripping mechanism

Abstract

This cable-gripping mechanism 100 comprises: a cable-gripping part 10 that grips a cable C that is laid between utility poles P; and an impact absorption part 20 that is connected to the cable-gripping part 10 and expands and contracts in the longitudinal direction of the cable C to absorb impact at the time of cutting the cable C.

Description

Cable gripping mechanism

[0001] The present disclosure relates to a technique for suppressing the sway of a cable when the cable laid between supports is cut.

[0002] Conventionally, cables laid on supports such as utility poles have been cut and relocated. In such work, since tension is applied to the cable, the cable may sway greatly or fall.

[0003] Therefore, a cable is gripped while preventing the cable from swaying or falling by using a gripper that grips the end of the cut cable (see Non-Patent Document 1).

[0004] However, simply gripping the cable with a gripper may cause the cable to be pulled out of the gripper when high tension is applied to the cable.

[0005] Suspension bolt anti-vibration fitting, Negro Electric Works, Internet, <URL>: https: / / products.negurosu.co.jp / seriesdetails?id=DYR1S-W3

[0006] In order to solve the above problems, an object of the present disclosure is to provide a technique capable of gripping a cable even when high tension is applied to the cable.

[0007] In order to achieve the above object, the cable gripping mechanism and the cable cutting method of the present disclosure use a shock absorption part that is connected to the cable and expands and contracts in the longitudinal direction of the cable to absorb the shock at the time of cable cutting.

[0008] Specifically, the cable gripping mechanism of the present disclosure includes a cable gripping part that grips a cable laid between supports, and a shock absorption part that is connected to the cable gripping part and expands and contracts in the longitudinal direction of the cable to absorb the shock at the time of cable cutting.

[0009] In the above configuration, the cable gripping portion may be configured to grip the cable by sandwiching it between the pair of plate-shaped members, with the length of the cable in the longitudinal direction being variable.

[0010] Furthermore, the shock-absorbing portion may have a wire connected to the cable gripping portion, and the wire may expand and contract in the longitudinal direction of the cable to absorb the shock when the cable is cut.

[0011] Furthermore, the shock-absorbing portion may have a high-tensile spring connected to the cable gripping portion, and the high-tensile spring may expand and contract in the longitudinal direction of the cable to absorb the impact when the cable is cut.

[0012] Furthermore, the system may include a wire fixing section for securing the wire to the support.

[0013] Furthermore, the cable may be provided with a wire fixing portion on the side opposite to the cable gripping portion at the point of cutting when the cable is cut, for fixing the wire.

[0014] Furthermore, the system may include a wire fixing part for securing the wire to the ground.

[0015] Furthermore, the cable cutting method of this disclosure involves grasping a cable laid between support structures and absorbing the impact of cable cutting by using an impact absorbing part connected to the cable that expands and contracts in the longitudinal direction of the cable to absorb the impact of cable cutting.

[0016] Furthermore, the above disclosures can be combined as much as possible.

[0017] According to this disclosure, it is possible to grip the cable even when high tension is applied to it.

[0018] This figure illustrates the problem of this disclosure. This figure illustrates an overview of the cable gripping mechanism according to an embodiment of this disclosure. This figure illustrates the effects of the cable gripping mechanism according to an embodiment of this disclosure. This figure illustrates the configuration of the cable gripping mechanism according to an embodiment of this disclosure. This figure illustrates the configuration of the cable gripping part as viewed from the side of the cable. This figure illustrates the configuration of the cable gripping part as viewed from the axial direction of the cable. This figure illustrates that the cable gripping part is variable with respect to the cable. This figure illustrates the function of the shock absorbing part. This figure illustrates a modified example of the shock absorbing part. This figure illustrates a first modified example of the wire fixing part. This figure illustrates a second modified example of the wire fixing part. This figure illustrates a third modified example of the wire fixing part. This figure illustrates a modified example of fixing the wire to the ground.

[0019] Embodiments of this disclosure will be described in detail below with reference to the drawings. However, this disclosure is not limited to the embodiments shown below. These examples are illustrative, and this disclosure can be implemented in various modified and improved forms based on the knowledge of those skilled in the art. In this specification and in the drawings, components with the same reference numerals refer to the same components.

[0020] [Overview of Cable Gripping Mechanism] An overview of the cable gripping mechanism 100 according to the embodiment of this disclosure will be described with reference to Figures 1 to 3. In the following description, the top, bottom, left, and right directions in each figure correspond to the top, bottom, left, and right directions of each component.

[0021] Figure 1 illustrates the problem of this disclosure. Figure 1 shows the cutting of a cable C laid between utility poles P as an example of a support structure. When cutting cable C while tension is applied to it, it is dangerous because the cable C may swing, fall, or bounce back. In contrast, it is conceivable to cut cable C while gripping it using a gripping device described in Non-Patent Document 1. However, simply gripping the cable with a gripping device carries the risk that the cable may slip out of the gripping device if high tension is applied to it.

[0022] Therefore, in this embodiment, as shown in Figure 2, the cable gripping mechanism 100 is used to grip the cable C while absorbing the impact when the cable is cut under tension. As shown in Figure 2, the cable gripping mechanism 100 comprises a cable gripping section 10, an impact absorbing section 20, and a wire fixing section 30. The cable gripping section 10 is configured to grip the end of the cut cable C. The impact absorbing section 20 is configured to use a wire W to absorb the impact when the cable is cut under tension. The wire fixing section 30 fixes the wire W to the utility pole P. In this embodiment, assuming the cable C attached to the utility pole P is cut, the cable gripping section 10 grips the cut end of the cable C, and the wire fixing section W is fixed to the upper part of the utility pole P.

[0023] Specifically, the cable gripping mechanism 100 includes a cable gripping section 10 that grips a cable C laid between utility poles P, and an impact absorbing section 20 connected to the cable gripping section 10 that expands and contracts in the longitudinal direction of the cable C to absorb the impact when the cable C is cut.

[0024] According to this embodiment, the cable C is gripped while absorbing the impact when the cable is cut. Therefore, as shown in Figure 3, when the cable C is cut while tension is applied to the cable C, it is possible to suppress the rebound of the cable C and reduce the risk of the gripping portion of the cable C being pulled out.

[0025] [Configuration and Operation of Cable Gripping Mechanism] The configuration and operation of the cable gripping mechanism 100 according to the embodiment of this disclosure will be described in detail with reference to Figures 4 to 8.

[0026] As shown in Figure 4, the cable gripping mechanism 100 comprises a cable gripping section 10, a shock absorbing section 20, and a wire fixing section 30. The cable gripping section 10, the shock absorbing section 20, and the wire fixing section 30 are connected by a wire W. The cable gripping section 10 is a device for gripping the cable C to be cut. The wire fixing section 30 is a device for fixing the wire W to the utility pole P and connecting the utility pole P to the cable gripping section 10 and the shock absorbing section 20. In this embodiment, an example is shown in which the cable gripping section 10 and the shock absorbing section 20 are connected to the utility pole P via the wire W by the wire fixing section 30. Note that the wire W is the same as a commercially available product.

[0027] The shock-absorbing section 20 is a device that absorbs the shock generated after or during cable breakage. The shock-absorbing section 20 is constructed by housing the wire W inside a plastic box. The strength of the plastic box is lower than the gripping force of the cable gripping section 10 that grips the cable C.

[0028] Figures 5 and 6 illustrate the configuration of the cable gripping section 10. As shown in Figures 5 and 6, the cable gripping section 10 has a first plate member 11 and a second plate member 12 that extend in the longitudinal direction of the cable C. Each of the first plate member 11 and the second plate member 12 is provided in pairs so as to sandwich the cable C. The frictional force increases as the cable gripping section 10 grips the cable C in a way that covers it, thereby increasing the gripping force.

[0029] The second plate member 12 is formed to be smaller than the first plate member 11 and is configured to slide inside the first plate member 11. For example, the central part of the first plate member 11 may be recessed away from the cable C, and the second plate member 12 may be slidably housed in this recess.

[0030] Furthermore, each of the first plate member 11 and the second plate member 12 has three bolt holes 10A formed in them, aligned along their longitudinal direction. The bolt holes 10A penetrate the first plate member 11 and the second plate member 12 in the thickness direction of the first and second plate members 12. The user positions the first plate member 11 so that at least one of the three bolt holes 10A of the first plate member 11 overlaps with at least one of the three bolt holes 10A of the second plate member 12, and fixes the first plate member 11 and the second plate member 12 together with bolts 13 or the like so as to sandwich the cable C. The first plate member 11 and the second plate member 12 function as a pair of plate-like members whose length in the longitudinal direction of the cable C is variable.

[0031] Figure 5 shows a situation where the two bolt holes 10A on the right side of the first plate member 11 and the two bolt holes 10A on the left side of the second plate member 12 overlap. However, the scope of this disclosure is not limited to this, and the first plate member 11 and the second plate member 12 may be fixed together with all bolt holes 10A overlapping. Alternatively, the first plate member 11 and the second plate member 12 may be fixed together with one bolt hole 10A on the right side of the first plate member 11 and one bolt hole 10A on the left side of the second plate member 12 overlapping.

[0032] Figure 7 illustrates the function of the cable gripping portion 10. In this embodiment, as shown in Figure 7, the gripping force can be further increased by changing (lengthening) the longitudinal length of the cable gripping portion 10. Furthermore, the longitudinal length of the cable gripping portion 10 can be adjusted according to the required gripping force.

[0033] Furthermore, as shown in Figure 6, each first plate member 11 is provided with a fall prevention claw 14 that protrudes toward the opposite first plate member 11 at its lower end. The fall prevention claws 14 overlap at the bottom of the cable C, preventing the cable C from falling.

[0034] Figure 8 illustrates the function of the shock absorption section 20. Specifically, Figure 8 shows the behavior of the shock absorption section 20 when the cable C is cut. As described above, the strength of the plastic box that houses the wire W in the shock absorption section 20 is designed to be lower than the gripping force of the cable gripping section 10, so the box breaks when the cable C is cut. At this time, the wire W comes out of the box, creating excess length. This excess length absorbs the impact when the cable C is cut, thereby preventing the cable C from being pulled out of the cable gripping section 10. In other words, the wire W expands and contracts in the longitudinal direction of the cable C, absorbing the impact when the cable C is cut. This reduces the amount of swinging at the tip of the cable C.

[0035] [Modifications] The scope of this disclosure is not limited to the embodiments described above. Modifications of the cable gripping mechanism will now be described with reference to Figures 9 to 13.

[0036] Figure 9 shows a cable gripping mechanism 101 equipped with an impact absorbing part 21 instead of an impact absorbing part 20. The impact absorbing part 21 is made of a high-tensile spring. In this modified example, the high-tensile spring stretches when the cable C is cut, thereby absorbing the impact when the cable C is cut. In other words, the high-tensile spring expands and contracts in the longitudinal direction of the cable C, absorbing the impact when the cable C is cut. As a result, the force in the direction that pulls the cable C out of the cable gripping part 10 when the cable C is cut is reduced, and the large swing of the tip of the cable C can be suppressed.

[0037] Figure 10 shows a cable gripping mechanism 102 that has a wire fixing part 31 instead of a wire fixing part 30. The wire fixing part 31 has a ring-shaped end and is fixed to the utility pole P by passing the wire W through it.

[0038] Figure 11 shows a cable gripping mechanism 103 that includes a wire fixing part 32 instead of a wire fixing part 30. The wire fixing part 32 includes a plate 32A and a band 32B. In this modified example, the plate 32A to which the wire W is connected is fixed to the utility pole P by the band 32B.

[0039] In the embodiments and modifications described above, examples were shown in which the cable gripping portion and the shock absorbing portion are connected to the utility pole P by a wire fixing portion. However, the scope of this disclosure is not limited thereto. In the cable gripping mechanism 104 shown in Figure 12, the cable gripping portion 10 and the shock absorbing portion 20 are connected to the cable C via a wire W by a wire fixing portion 33. In other words, the wire fixing portion 33 is fixed to the cable C on the side opposite to the cable gripping portion with respect to the cut point when the cable C is cut. Specifically, the wire fixing portion 33 may have the same configuration as the cable gripping portion 10 and be configured to grip the cable C.

[0040] In the cable gripping mechanism 105 shown in Figure 13, the cable gripping section 10 and the shock absorbing section 20 are connected to the ground via a wire W. Specifically, the wire W may be fixed to the ground using anchors or jigs.

[0041] The cable gripping mechanism of this disclosure can be applied to the information and communication industry.

[0042] 100, 101, 102, 103, 104, 105: Cable gripping mechanism 10: Cable gripping part 11: First plate member 12: Second plate member 13: Bolt 14: Anti-drop claw 21: Shock absorbing part 30, 31, 32, 33: Wire fixing part 32A: Plate 32B: Band

Claims

1. A cable gripping mechanism comprising: a cable gripping portion for gripping a cable laid between supporting objects; and an impact absorbing portion connected to the cable gripping portion, which expands and contracts in the longitudinal direction of the cable to absorb the impact when the cable is cut.

2. The cable gripping mechanism according to claim 1, wherein the cable gripping portion comprises a pair of plate-shaped members whose length in the longitudinal direction of the cable is variable, and the cable can be gripped by sandwiching the cable between the pair of plate-shaped members.

3. The cable gripping mechanism according to claim 1, wherein the shock absorbing part has a wire connected to the cable gripping part, and the wire expands and contracts in the longitudinal direction of the cable to absorb the shock when the cable is cut.

4. The cable gripping mechanism according to claim 1, wherein the shock absorbing part has a high-tensile spring connected to the cable gripping part, and the high-tensile spring expands and contracts in the longitudinal direction of the cable to absorb the shock when the cable is cut.

5. The cable gripping mechanism according to claim 3, further comprising a wire fixing portion for fixing the wire to the support.

6. The cable gripping mechanism according to claim 3, wherein the cable is provided with a wire fixing portion on the side opposite to the cable gripping portion at the point of cutting of the cable when the cable is cut, for fixing the wire.

7. The cable gripping mechanism according to claim 3, further comprising a wire fixing part for fixing the wire to the ground.

8. A cable cutting method comprising: grasping a cable laid between supporting objects; and absorbing the impact of cable breakage using an impact-absorbing part connected to the cable and which expands and contracts in the longitudinal direction of the cable to absorb the impact of cable breakage.

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