JP2003102124A - Apparatus for holding overhead cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for holding overhead cable, capable of facilitating recovery work and reducing the number of components. SOLUTION: In the apparatus for holding overhead cable A, a hanging metal fitting 16 comes off a groove 13 of a hook 12a at a center rod 12 by a compressed coil spring 10 and a ring 22a of a cable-holding metal fitting 21 slips off the hook of the center rod, when a hanging load greater than the predetermined value is applied from an overhead cable, held by the cable holding metal fitting 21. The groove is formed wide across the center line of the center rod. When the apparatus is recovered, the hanging metal fitting is removed from the lower face of a case, the ring of the cable-holding metal fitting slipped off is passed through the hook of the center rod, the cable-holding metal fitting is held in an inclined state with respect to the center line of the center rod on a side separated from the groove and the hanging metal fitting can be attached to the lower face of the case, while the hanging metal fitting is inserted obliquely into the groove. The case is constituted of a cylindrical member.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial cable holding device for holding an aerial cable for communication or the like with a support pole such as a telephone pole, and more particularly, to an aerial cable holding device such as a fallen tree. The present invention relates to a structure in which, when a large load is applied to a cable, the holding state is released and the overhead cable is automatically detached in order to prevent breakage of the overhead cable and collapse of a support column. 2. Description of the Related Art Conventionally, as this type of overhead cable holding device, for example, as shown in FIG. 11, a case a attached to a support column, a coil spring b housed in the case a, and one end Is connected to a tray c which is in contact with the upper end of the coil spring b, the other end of which extends downward from the inside of the case a and has a substantially D-shaped hook d1 at that portion.
Is attached to the lower surface of the case a via a support shaft e corresponding to the hook portion d1 of the true rod d, and the hook portion d
A bifurcated latch g inserted into the groove f formed in 1;
The true stick d in a state where it is retained by the latch g
And a cable holding fitting h having a ring part h1 that engages with the hook part d1. When a suspension load of a predetermined value or more is applied from the overhead cable held by the cable holding fitting h, the coil spring b is compressed. It is known that the latch g is detached from the groove f of the hook d1 of the true rod d, and the ring h1 of the cable holding fitting h is dropped off from the hook d1 of the true rod d. In this case, the center point of attachment of the case a to the support column (the axis of the bolt i), the center line of the true rod d, and the center line of the cable holding bracket h are set to be substantially on a straight line L, The width of the groove f is set to be substantially the same as the thickness of the latch g, as shown in detail in FIG. [0003] However, in the above-mentioned conventional device, when the cable holding fitting h detached together with the overhead cable is engaged with the hook portion d1 of the true rod d to recover the same, After disassembling the case a, removing the joining bolt j, and lowering the hook d1, the ring h1 of the cable holding fitting h is passed through the hook d1 of the true rod d, and the hook g is inserted into the groove f. Then, the hook part d1 is lifted, and the joining bolt j must be attached in this state to assemble the case a. Thus, there is a problem that the recovery work is troublesome. In addition, since the case a needs to be disassembled, it must be configured by using the case body a1 and the cover a2 forming the side surface, and there is a problem that the number of parts increases and the cost increases. . [0004] The present invention has been made in view of such a point, and the subject thereof is to focus particularly on the groove f of the hook portion d1 of the true rod d, and to utilize this groove f to form the case. Without disassembly, the cable holding fitting d is engaged with the hook portion d of the true rod d in the original state in a retaining state,
It is an object of the present invention to provide an overhead cable holding device capable of facilitating recovery work and reducing the number of parts. [0005] In order to solve the above-mentioned problems, the present invention provides an aerial cable holding device, a case attached to a support column, a coil spring housed in the case, and one end. Is connected to a tray abutting on the upper end of the coil spring, the other end extends downward from the inside of the case and has a substantially rectangular hook portion at that portion, and corresponds to a hook portion of the true bar. To the lower surface of the case via a support shaft, and to a forked latch inserted in the groove formed in the hook portion, and to the hook portion of the true bar in a state where the hook is locked by the latch. And a cable holding fitting having a ring portion to be engaged. When a hanging load of a predetermined value or more is applied from the aerial cable held by the cable holding fitting, the hook fitting becomes true by compression of the coil spring. It is assumed that the ring portion of the cable holding fitting is detached from the hook portion of the true rod so as to fall out of the groove of the hook portion of the rod. Then, the groove is formed wider than the center line of the true rod, the latch is removed from the lower surface of the case when the apparatus is restored, and the ring portion of the dropped cable holding bracket is passed through the hook of the true rod, This cable holding bracket is held in a state of being inclined to the side away from the groove with respect to the center line of the true bar, so that the latch can be attached to the lower surface of the case while being inserted obliquely into the groove, and the case is cylindrical. It is constituted by a member in the shape of a letter. In this configuration, since the groove of the hook portion of the true rod is formed to be wider than the center line of the true rod, when the apparatus is restored, the latch is removed from the lower surface of the case, and the detached cable holding bracket is removed. Through the ring part of the true rod, hold the cable holding bracket in a state where it is inclined to the side away from the groove with respect to the center line of the true rod, and insert the latch into the groove obliquely, while lowering the case. It does not require complicated restoration work such as disassembly of a case and removal of a joint bolt as in the related art. Further, since the case does not need to be disassembled at the time of restoration, the case can be constituted by a cylindrical member, and the number of parts can be reduced accordingly. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overhead cable holding device A according to one embodiment of the present invention, and 1 is a case attached to a support arm (not shown) of a support pole such as a telephone pole. A case body 2 made of a cylindrical member as shown in FIG. 4 and an upper plate 3 for closing the upper end of the case body 2 are fastened with bolts 4. The case body 2 has a square upper end flange 2.
a, and a bottom 2b having a circular shape. Bolt insertion holes 5 are provided at four corners of the upper end flange 2a, and the upper plate 3 is bolted to each of the bolt insertion holes 5 by bolts. I have. The bottom 2b of the case body 2 is provided with a through hole 6 at the center thereof, and a pair of bearings 7, 7 projecting downward at a position apart from the through hole 6 by a predetermined dimension. ing. The upper plate 3 is provided with a mounting portion 8 for mounting to a support column. [0008] A coil spring 10 and a tray 11 abutting on the upper end thereof are housed in the case 1. The coil spring 10 is provided between the bottom 2 b of the case 1 (specifically, the case body 2) and the tray 11. It is arranged to be compressible.
One end of a true rod 12 penetrates from the coil spring 10 side and is connected to the receiving tray 11 by screwing with a bolt 14. The other end of the true rod 12 is connected to the through hole 6 of the bottom 2 b of the case 1.
The hook portion 12a extends downward from the inside of the case 1 and has a substantially rectangular shape at the extended portion.
Is formed. As shown in detail in FIG. 5, the hook portion 12a is formed with grooves 13 extending in the direction of the center line L1 (vertical direction) on both left and right sides, respectively.
Each of the grooves 13 extends from the vicinity of the tip of the hook portion 12b to the true rod 1
It is formed wider than the center line L1. A latch 16 is attached to the bearing 7 of the bottom 2b of the case 1 via a support shaft 15 corresponding to the hook 12a of the true rod 12. As shown in detail in FIG. 6, the latch 16 is formed by fixing a boss 16b to one shorter side of a latch main body 16a bent substantially in an L-shape. The support shaft 15 is penetrated and supported between the pair of bearing portions 7, 7. A longer side of the latch body 16a is formed in a forked shape having an elongated slit groove 17 from the tip end side.
The hook 1 is inserted into the narrow portion of the hook 12a between the left and right grooves 13, 13 (in other words, the hook main body 16a is inserted into the groove 13 of the hook 12a).
6 are supported. Further, one end of a cable holding member 21 for holding the overhead cable 20 (see FIG. 9) is engaged with the hook portion 12a of the true rod 12 in a state where the cable holding member 21 is prevented from coming off by the hook member 16. This cable holding bracket 21 is
A plurality of members 22, 23, 2 as shown in FIGS.
4 are connected in a chain shape by support shafts 25 and 26, and a ring portion 22 a is formed on the member 22 at one end, and the ring portion 22 a is engaged with the hook portion 12 a of the true rod 12. Next, the operation of the overhead cable holding device A will be described with reference to FIGS. Now, FIG.
As shown in (a), the overhead cable 20 is held in a suspended state by the overhead cable holding device A. In this case, the center point of the mounting portion 8 of the case 1, the center line of the true rod 12, and the center line of the cable holding bracket 21 are substantially straight L.
(See FIG. 1). 9 and 10
Reference numeral 30 denotes a messenger wire bound to the overhead cable 20. When the overhead cable 20 is held by the holding device A, in the case of the present embodiment, the overhead cable 20
Instead of this, the messenger wire 30 is held by the cable holding fitting 21. In such a state, under normal conditions when a load equal to or less than a predetermined value acts on the overhead cable holding device A from the overhead cable 20 in addition to the own weight of the overhead cable 20, FIG.
As shown in (b), even when the coil spring 10 is compressed and the hook portion 12a of the true rod 12 and the cable holding metal fitting 21 are lowered, the latch 16 remains in the groove 1 of the hook portion 12a of the true rod 12.
3, the ring portion 22a of the cable holding fitting 21 does not fall out of the hook portion 12a of the true rod 12. On the other hand, when a suspension load of a predetermined value or more acts on the overhead cable holding device A from the overhead cable 20, such as when a fallen tree falls on the overhead cable 20, as shown in FIG. Then, the latch 16 is disengaged from the groove 13 of the hook portion 12a of the true rod 12 due to the compression of the coil spring 10, and the ring portion 22 of the cable holding member 21 is removed.
a falls off from the hook portion 12a of the true rod 12, and the overhead cable 20 is detached together with the cable holding fitting 21. Thereby, breakage of the aerial cable 20 and collapse of the support column can be prevented. Further, the cable holding fitting 21 detached together with the overhead cable 20 is returned to its original position,
In the case of restoring by engaging with a, first, FIG.
As shown in (1), the latch 16 that has been removed from the groove 13 of the hook portion 12a of the true rod 12 is removed from the bearing portion 7 of the bottom 2b of the case 1. Next, as shown in FIG. 10B, a cable holding metal fitting 21 for holding the overhead cable 20 is provided.
Through the hook portion 12a of the true rod 12,
The cable holding fitting 21 is held in a state where the cable holding fitting 21 is inclined to the side away from the bearing 7 and the groove 13 of the case bottom 2b with respect to the center line of the true rod 12. At this time, the hook portion 12 of the true rod 12
Since the groove 13a is formed wider than the center line of the true rod 12, the ring portion 22a of the cable holding fitting 21 is formed.
The groove 13 spreads and is exposed to the position where the is inclined. Subsequently, while holding the cable holding member 21 in an inclined state, the hook member 16 is inserted obliquely from the bearing portion 7 side of the case bottom portion 2b into the groove 13 of the hook portion 12a of the true rod 23 while holding the cable holding member 21 in an inclined state. The 16 bosses 16b are mounted on the bearing 7 of the case bottom 2b via the support shaft 15 (the state shown in FIG. 10C). Thereafter, when the cable holding member 21 is returned to a position on the center line of the true rod 12, the ring portion 22 a of the cable holding member 21 is engaged with the hook portion 12 a of the true bar 12 in a state where the ring portion 22 a is prevented from coming off by the hook 16. , Will be restored as before. As described above, according to the overhead cable holding device A of the present embodiment, complicated work such as disassembly of the case 1 and removal of the bolt 14 on the true rod 12 side is not required at the time of restoration. Thus, the recovery operation can be performed easily and quickly, and the workability can be improved. Moreover,
Since the case 1 does not need to be disassembled at the time of restoration, the case 1 can be constituted by the case body 2 and the upper plate 3 which are cylindrical members, and the case body a1 and the two covers (See FIG. 11), the number of components can be reduced, which contributes to cost reduction and facilitation of component management. The present invention is not limited to the above embodiment, but includes various other embodiments. For example, in the above embodiment, the latch 16 is configured such that the boss portion 16b is fixed to one side of the latch main body 16 bent in a substantially L-shape.
It is also possible to use a single member and a bifurcated shape, such as a latch g in the case of the conventional example shown in FIG. In the above embodiment, the grooves 13 are formed on both right and left sides of the hook portion 12a of the true rod 12, but the present invention is applicable to only one of the right and left sides of the hook portion 12 of the true rod 12. A groove may be formed. As described above, according to the overhead cable holding device of the present invention, a simple configuration in which the groove of the hook portion of the true rod is formed to be wider than the center line of the true rod is provided. Since the ring portion of the cable holding fitting can be engaged with the hook portion of the true bar without disassembling the case, the recovery work can be facilitated, and the number of components of the case can be reduced to reduce the cost. Can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view in which a part of an overhead cable holding device according to an embodiment of the present invention is cut away. FIG. 2 is a side view of a case main body that is a component of the overhead cable holding device. FIG. 3 is a plan view of the same. FIG. 4 is a bottom view of the same. 5 (a) and 5 (b) show a true bar, and FIG. 5 (a) is a front view and FIG. FIG. 6 is a front view of the same metal fitting.
(B) is a side view. FIG. 7 is a front view of one member of the cable holding fitting. FIG. 8 is a front view of another member of the cable holding fitting. FIG. 9 is an explanatory diagram for explaining an operation by the overhead cable holding device. FIG. 10 is also an explanatory view. FIG. 11 is a diagram corresponding to FIG. 1 showing a conventional example. FIG. 12 is a diagram corresponding to FIG. 5; [Description of Signs] A Overhead cable holding device 1 Case 1a Case main body (cylindrical member) 10 Coil spring 11 Receiving tray 12 True rod 12a Hook portion 13 Groove 16 Hook fitting 21 Cable holding fitting 22a Ring portion

Claims (1)

Claims: 1. A case attached to a support column, a coil spring housed in the case, and one end connected to a tray abutting on an upper end of the coil spring, and the other end connected to the case. A true bar extending downward from the inside and having a substantially V-shaped hook portion at the site, and a hook attached to the lower surface of the case via a support shaft corresponding to the hook portion of the true bar, and attached to the hook portion. A bifurcated latch fitting inserted into the formed groove, and a cable retaining bracket having a ring portion that engages with the hook portion of the true rod in a state where the hook is locked by the latching bracket, and is held by the cable retaining bracket. When a suspended load of a predetermined value or more is applied from the aerial cable that has been applied, the above-mentioned coil spring is compressed and the latch is released from the groove of the hook of the true bar, and the ring of the cable holding bracket is released from the hook of the true bar. In the overhead cable holding device configured to fall off, the groove is formed so as to be wider than the center line of the true bar, and when the device is restored, the latch is removed from the lower surface of the case, and the dropped cable holding bracket is removed. Through the ring part of the true rod, hold the cable holding bracket in a state where it is inclined to the side away from the groove with respect to the center line of the true rod, and insert the latch into the groove obliquely, while lowering the case. An aerial cable holding device, wherein the case is formed of a cylindrical member.