JP2015165749A - Holding body for ground shorting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding body for a ground shorting tool which enables easy attachment/detachment to/from an overhead wire, reduces loads to arms of a worker, and significantly shortens the work time.SOLUTION: A holding body for a ground shorting tool (a wiring side holding body 1) includes: a shorting metal fitting 2 including a hook part 21 which hooks on an overhead wire at an upper end part and formed by a conductor with which a shorting wire 102 connected with a ground wire is connected; a held part 3 including a pair of holding pieces (a fixed piece 31, a movable piece 32); an operation lever 4 rotatably supported by the shorting metal fitting; and a jaw 5 which varies a distance between itself and the hook part by rotation of the operation lever. The holding body for the ground shorting tool is provided with means which holds the held part with a holding tool and separates the jaw from the hook part, and the attachment/detachment work of the wiring side holding body to/from the overhead wire is carried out only by conducting an operation for holding the held part and an operation for rotating the operation lever.

Description

  TECHNICAL FIELD The present invention relates to a sandwiching body for a grounding short-circuit device used for short-circuiting an overhead electrical circuit to ensure the safety of workers during power outage work, and more particularly to an overhead wire that can be easily attached to and detached from an overhead electrical wire. It is related with the side clamping body.

  When performing power outage work in electrical equipment, for example, there is a risk of an operator's electric shock due to erroneous energization, reverse charging, contact with other electric circuits, or dielectric from other electric circuits. Via a wire, it is connected to a ground conductor embedded in the ground or a ground terminal on the ground side (see, for example, Patent Document 1).

  FIG. 8 shows an example of such a conventional grounding short-circuiting instrument. The grounding short-circuiting instrument 100 includes three overhead wire side clamping bodies 101 capable of clamping an overhead electric wire. The connected short-circuit wire 102 is connected to a single ground wire 104 by a connection portion 103, and a grounding metal fitting 105 attached to the tip of the ground wire 104 is attached to a grounding rod 106 or the like to be grounded.

  The overhead wire side sandwiching body 101 includes a short-circuit metal fitting 110 having a substantially U-shape, a movable part 120 capable of moving forward and backward in the axial direction of the common operation rod, a joint metal fitting 130 capable of inserting the tip of the common operation rod, A connection terminal 115 for connecting the short-circuit line 102 is provided.

  The short-circuit metal fitting 110 is made of a conductive metal material. The hook portion 111 is formed in the shape of a hook that can be hooked on an overhead electric wire from above, and is disposed opposite to the hook portion 111 and has a female screw at the center. And a base 112 having a through hole formed therein. The connection terminal 115 is attached to the back surface of the side wall portion 113 that connects the hook portion 111 and the base portion 112.

  The movable portion 120 has an electric wire sandwiched between a rod-shaped screw shaft portion 121 that has a male screw formed on the peripheral surface and meshes with the through hole of the base portion 112 so as to be able to advance and retreat, and the hook portion 111 of the short-circuit fitting 110. And a possible jaw 122. The jaw 122 has a concave portion on the upper surface facing the hook portion 111 and is attached to the tip of the screw shaft portion 121 in a state of being slidably locked to the side wall portion 113 of the short-circuit fitting 110. It can rotate relative to the screw shaft 121.

  The joint metal fitting 130 is a twist lock type in which the distal end portion of the common operation rod can be attached and detached, and is formed in a bottomed cylindrical shape having an open lower portion. A T-shaped engagement groove 131 that can be engaged with a locking protrusion protruding from the peripheral surface of the portion is formed.

  Of the three overhead wire side holding bodies 101, a temporary support tool 140 that temporarily supports the other two overhead wire side holding bodies 101 is attached to the short-circuit metal fitting 110 of one overhead wire side holding body 101.

  In order to perform a ground short-circuiting operation using such a ground short-circuiting instrument 100, first, the covering of the overhead wire of the three-phase electric wire is stripped using an indirect live wire stripping tool (not shown), and the core wire Leave exposed. Further, the other two overhead wire side holding bodies 101 are temporarily supported in advance on the overhead wire side holding body 101 to which the temporary support tool 140 is attached. The tip of the common operation rod is inserted and connected to the joint fitting 130 of the overhead wire side clamping body 101 on which the other two overhead wire side clamping bodies are temporarily supported, and the grounding rod 106 driven into the ground is grounded. The metal fitting 105 is connected.

  Then, the jaw 122 of the movable portion 120 is separated from the hook portion 111 of the short-circuit fitting 110 so that the short-circuit fitting 110 of the overhead wire holding body 101 to which the temporary support 140 is attached can be hooked on the central overhead wire. In this state, the common operation rod is lifted, and the hook portion 111 of the short-circuit metal fitting 110 of the overhead wire side holding body 101 to which the temporary support 140 is attached is hooked on the portion where the covering of the overhead electric wire is peeled off. Thereafter, the common operation rod is rotated to rotate the screw shaft portion 121, the jaw 122 is advanced toward the hook portion 111, and the electric wire is sandwiched between the hook portion 111 and the jaw 122.

  For the other two overhead wire side clamping bodies 101 attached to the temporary support tool 140, the common operation rod is sequentially attached to the joint metal fitting 130 of the overhead wire side clamping body 101 and detached from the temporary support tool 140, and other electric wires are removed. Each wire is grounded by attaching it to the part where the coating is peeled off.

JP 2010-252467 A

  As described above, in the conventional grounding and short-circuiting device, the distance between the hook part of the short-circuit fitting and the jaw of the movable part is adjusted by rotating the screw shaft part of the movable part. When attaching a metal fitting (hook part) to an electric wire, the following problems have arisen.

  Since the joint fitting 130 is provided at the base end of the screw shaft portion 121 of the movable portion 120 and rotates integrally with the screw shaft portion 121, only the common operation rod is attached with the common operation rod attached to the joint fitting 130. If it is held and it is going to lift the overhead wire side clamping body 101, the short-circuit metal fitting 110 will be in the state which can rotate freely centering | focusing on the screw shaft part 121. FIG. For this reason, in the grounding work, an operation is performed in which the open side (the side opposite to the side wall portion 113) of the short-circuit fitting 110 is approached and hooked on the electric wire, but the short-circuit wire 102 attached to the short-circuit fitting 110 is employed. The direction of the open side is not stable due to the tension of the arm or the angle of the common operation rod, and even if an electric wire is inserted between the hook portion 111 of the short-circuit fitting 110 and the jaw 122 of the movable portion 120, the short-circuit fitting 110 is It becomes impossible to operate in the direction, and it becomes difficult to insert the electric wire. Therefore, by making the opening degree between the hook portion 111 of the short-circuit fitting 110 and the jaw 122 of the movable portion 120 the maximum, the jaw 122 of the movable portion 120 is brought into contact with the base portion 112 of the short-circuit fitting 110 so that the short-circuit fitting 110 is fixed. A lock state in which the screw shaft 121 cannot rotate is formed.

  Therefore, when connecting the common operation rod to the joint fitting 130 and approaching the electric wire, it is necessary to rotate the screw shaft portion 121 of the movable portion 120 to the position where the jaw 122 is lowered (the position farthest from the hook portion 111). In addition, the burden on the arm having the common operation rod became very large and time consuming.

  In the grounding short-circuit instrument 100 for grounding the high-voltage three wires described above, in the overhead wire side holding body 101 to which the temporary support 140 is attached, the position where the jaw 122 is farthest from the hook portion 111 on the ground before approaching the electric wire. In the overhead wire side holding body 101 attached to the temporary support tool 140, the temporary support tool is provided between the hook part 111 of the short-circuit fitting 110 and the jaw 122 of the movable part 120. Since 140 is sandwiched, the common operation rod is rotated to the position where the screw shaft 121 of the movable part 120 is lowered most from the state where the jaw 122 is located (the position furthest away from the hook part 111). After hooking the hook portion 111 of the short-circuit fitting 110, the electric wire is sandwiched between the hook portion 111 of the short-circuit fitting 110 and the jaw 122 of the movable portion 120. Is necessary to rotate the common operation stick again until the writing there, the burden on the arm was substantial.

  In addition, since the conventional overhead wire side holding body 101 employs a method in which the common operation rod is attached to the joint metal fitting 130, the center of the joint metal fitting 130 is inserted when the common operation rod is inserted into or removed from the joint metal fitting 130. If the common operation rod is not moved along the axis, there is a disadvantage that it is difficult to attach and remove the joint fitting 130.

  The present invention has been made in view of such circumstances, can be easily attached to and detached from an overhead electric wire, can reduce the burden on the operator's arm, and can greatly shorten the work time. The main object is to provide a sandwiching body for a grounding short-circuit device that can be used.

  In order to achieve the above-described object, the holding member for grounding short-circuiting apparatus according to the present invention includes a hook portion hooked on an overhead electric wire at an upper end portion, and is composed of a conductor to which a shorting wire connected to the grounding wire is connected. Provided with a short-circuit bracket and a pair of grip pieces that can be gripped with a gripping tool, one of the grip pieces is a fixed piece fixed to the short-circuit bracket, and the other grip piece is moved closer to the one grip piece A gripped portion that is a movable piece, an intermediate portion that is rotatably supported with respect to the short-circuit metal fitting, an operation lever that includes an operation portion at one end with respect to the rotation center, and a boundary between the rotation center of the operation lever The jaw is provided on the other end side, and the state in which the distance from the hook portion is variable by the rotation of the operation lever is kept close to the hook portion of the jaw, and the pair of gripping pieces are Grip with a gripping tool Is characterized by comprising, a state holding and releasing means for separating said jaws from said hook portion to release the close state to the hook portion of the jaws between.

Therefore, when approaching the electric wire, if a pair of gripping pieces of the gripped portion is gripped by a gripping tool such as an insulating jacket, a state where the jaw is separated from the hook portion is formed by the state holding / releasing means, and the wire is connected as it is. It can be hooked on the hook portion. Then, after hooking the hook part to the electric wire, the state where the pair of gripping pieces are gripped is released, the operation part of the operation lever is operated, and the jaw provided on the other end side of the operation lever is used as the hook part. If the overhead electric wire is sandwiched between the hook portion and the jaw, the state is held by the state holding / release means.
Further, in order to release the state in which the electric wire is held between the hook portion and the jaw, the pair of gripping pieces of the gripped portion may be gripped again by the gripping tool.

  For this reason, it is possible to attach and detach the grounding short-circuiting device clamp to the electric wire only by gripping the pair of gripping pieces of the gripped part with the gripping tool and rotating the control lever. Moreover, it becomes possible to attach the clamping body for earthing | grounding short circuit devices to an electric wire in a short time.

  Here, as a specific configuration of the state holding / releasing means, a gear that rotates with the operation lever so that the rotation center of the operation lever coincides with the axis, and a gear provided on the movable piece, In a meshed state, a claw part that allows only the one-way rotation of the operation lever so that the jaw is brought close to the hook part, and the movable piece is always in a direction in which the claw part meshes with the gear. You may make it comprise the 1st spring to urge, and the 2nd spring which always provides the urging | biasing force which rotates the said operation lever in the direction which makes the said jaw separate from the said hook part.

The jaw may be attached to the operation lever so as to be rotatable, and is urged by a third spring so that the upper surface thereof faces the hook portion.
With such a configuration, the upper surface of the jaw can always be opposed to the hook portion, and the jaw is rotated so that a portion other than the upper surface abuts against the electric wire arranged between the jaw portion. Can be avoided.

  Moreover, you may make it attach to the short-circuit metal fitting mentioned above so that the temporary support tool which latches the clamping body for other earthing | grounding short-circuiting devices can be attached or detached.

  As described above, according to the sandwiching device for grounding short circuit device according to the present invention, when attaching to the overhead wire, the operation of rotating the gripping tool becomes unnecessary, and can be easily attached to and detached from the overhead wire. The burden on the operator's arm can be greatly reduced, and the working time can be greatly shortened.

  In addition, when approaching and attaching / detaching the holding body for the grounding short circuit device to / from the electric wire, only the operation of holding the pair of holding pieces and the operation of rotating the operation lever are required, and there is no need to attach a common operation rod. Therefore, the operation of attaching and detaching the common operation rod by aligning the shaft center with the joint metal fitting becomes unnecessary, and from this point, the work can be performed easily and in a short time.

FIG. 1 is a diagram showing a grounding short-circuiting instrument clamping body (overhead side clamping body) according to the present invention, (a) is a front view thereof, (b) is a side view of (a) as viewed from the left side, (C) is the back view, (d) is the side view which looked at (a) from the right side. FIG. 2 is a view showing a state in which a grounding short-circuiting instrument clamping body (cable body side clamping body) according to the present invention is gripped by a gripping tool (insulating Yoko), (a) is an external view thereof, and (b) is an internal view. It is a figure which shows the state hold | gripped with the holding tool while showing a structure. FIG. 3 is a view showing components of the holding member for grounded short circuit device (overhead side holding member) according to the present invention, and (a) shows a view of each component from the side and a perspective view of the base. (B) shows the figure which looked at each component from the front and / or the figure seen from the upper part, and the figure which shows the state which assembled | attached the movable body to the base | substrate. FIG. 4 is a diagram showing a state in which an electric wire is clamped by using a grounding short-circuiting device clamping body (overhead side clamping body) according to the present invention, and (a) is a diagram showing a state in which a small-diameter electric wire is clamped. (b) is a figure which shows the state which clamps a medium diameter electric wire, (c) is a figure which shows the state which clamps a large diameter electric wire. 5A and 5B are diagrams showing the temporary support, wherein FIG. 5A is a side view thereof, FIG. 5B is a front view thereof, FIG. 5C is a rear view thereof, and FIG. 5D is a plan view thereof. FIG. 6 is a diagram showing a state in which the temporary support is attached to the grounding short-circuiting instrument clamping body (overhead side clamping body) according to the present invention, (a) is a side view thereof, (b) is a front view thereof, (C) is a plan view thereof. FIG. 7: is a figure which shows the state which attached the other clamping body (ground wire side clamping body) for other earth | ground short-circuiting devices to the clamping body (ground wire side clamping body) for earthing short-circuiting apparatuses which attached the temporary support, (a) Is a front view thereof, and (b) is a side view thereof. FIGS. 8A and 8B are diagrams showing a conventional earthing and short-circuiting device, in which FIG. 8A is a front view showing the overall configuration, and FIG. 8B is a side view showing a portion of the overhead wire side clamping body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The grounding short-circuiting instrument has three overhead wire side clamping bodies capable of clamping an overhead electric wire, and connects the shorting wires connected to each overhead wire side clamping body to a single grounding wire at the connection portion, and the tip of this grounding wire It is attached to a grounding rod or the like via a grounding metal fitting attached to, and is grounded, and is the same as the conventional configuration shown in FIG. 8 except for the structure of the overhead wire side clamping body.

  As shown in FIG. 1 to FIG. 3, each overhead wire side clamping body 1 is provided with a short-circuit fitting 2 to be hooked on an overhead electric wire and a lower portion of the short-circuit fitting 2 and can be grasped by a grasping tool such as an insulating jacket. A grip 3, an operation lever 4 rotatably provided on the short-circuit fitting 2, and a jaw 5 as a movable body that moves up and down by the operation lever 4 are provided.

  The short-circuit fitting 2 is formed of a conductive metal material, and a hook portion 21 formed in a hook shape that can be hooked on the overhead electric wire from above is provided at the upper end portion, and the hook portion 21 faces downward. The side wall 22 is extended. A connection terminal 102 a of the short-circuit line 102 connected to the ground line is attached to the back surface of the side wall portion 22 by a bolt 62 via a washer 61. The bolt 62 is screwed into a boss portion 73 of the base 7 integrally formed with a fixing piece 31 to be described later through a through hole 23 formed in the side wall portion 22 to fix the short-circuit fitting 2 to the base 7 and the bolt. The connection terminal 102 a of the short-circuit wire 102 is press-contacted to the side wall portion 22 at the head 62, and the short-circuit wire 102 is electrically connected to the short-circuit fitting 2.

  Further, a pin 64 for locking one end of the torsion coil spring 63 is fixed to the inner surface of the side wall portion 22 by means such as screwing or press fitting, and a screw 65 for screwing the base body 7 to the short-circuit fitting 2. Is formed through the washer 66.

  The gripped portion 3 includes a pair of gripping pieces including a fixed piece 31 fixed to the short-circuit fitting 2 and a movable piece 32 movable so as to move away from the fixed piece 31. .

  The fixing piece 31 is integrally formed on the side plate portion 71 of the base body 7 fixed to the inner surface side of the short-circuit fitting 2 below the hook portion 21. The base body 7 includes a side plate portion 71 extending substantially in parallel with the side wall portion 22, and a plate-shaped fixing piece 31 erected substantially vertically from the side plate portion 71 and extending downward. A stopper piece 72 erected in parallel with the upper end of the fixed piece 31 in a horizontal direction with a predetermined gap from the side plate 71, and formed above the stopper piece 72, And a columnar boss portion 73 extending substantially vertically.

  Further, in this example, an L-shaped reinforcing rib 74 for positioning the gripping piece of the gripping tool approached from below and screwing the base 7 to the short-circuit fitting 2 is integrally formed at the upper end portion of the fixed piece 31. Has been. The reinforcing rib 74 is formed with a screw hole 74 a for screwing the screw 65, and the boss portion 73 is formed with a screw hole 73 a for screwing the bolt 62.

  The fixed piece 31 and the reinforcing rib 74, the boss part 73, and the stopper piece 72 integrated with the fixed piece 31 are set to protrude from the side plate part 71 so that their tips are on the same plane. When these bolts 62 and screws 65 are fixed in a state where these tips are in contact with the side wall portion 22 of the metal fitting 2, a fixing piece 31, a reinforcing rib 74, a stopper piece 72, between the side wall portion 22 and the side plate portion 71, And the boss | hub part 73 will be arrange | positioned fixedly. The interval between the side wall portion 22 and the side plate portion 71 is formed to be substantially equal to the interval between the tip end portion of the hook portion 21 and the side wall portion 22, and is formed to have a width that allows the holding portion of the holding tool to be inserted. ing.

  On the other hand, the movable piece 32 is formed integrally with the head portion 81 of the movable body 8 that is movably assembled to the base body 7. The movable body 8 includes a head portion 81 and a plate-like movable piece 32 projecting substantially perpendicularly from the head portion 81 and extending downward. The movable piece 32 is a fixed piece 31. And the same shape. The head portion 81 is formed to have a size extending from the upper end portion of the fixed piece 31 to the upper end portion of the stopper piece 72, and the movable piece 32 extends downward from the gap between the fixed piece 31 and the stopper piece 72. It is provided and can move in the horizontal direction in a range from a position contacting the fixed piece 31 to a position contacting the stopper piece 72.

  The head 81 of the movable body 8 has a tension spring 68 attached at one end to an attachment hole provided at the head 81 and the other end attached to the pin 64 provided at the short-circuit fitting 2. Further, a claw portion 9 that is detachably engaged with a gear that will be described later is fixed to the upper end portion of the head portion 81 by a screw 91. In this example, the claw portion 9 protrudes in a direction in which the claw portion 9 is pulled by the tension spring 68.

  The operation lever 4 is formed of a long, hard material having a predetermined thickness, is attached to the boss portion 73 and is rotatable around the boss portion 73. A shaft hole 41 through which 73 is inserted is formed in the intermediate portion. In addition, an operation unit 42 is formed on the one end side with the rotation center (shaft hole 41) as a boundary. A jaw 5 to be described later is attached to the other end side with respect to 41). In this example, the operation part 42 makes it difficult to remove the indirect hot wire tool whose tip is bulged and hooked.

  On one side surface of the operation lever 4 (the side surface facing the side plate portion 71 of the base body 7 in a state where the operation lever 4 is attached to the boss portion 73, that is, the side surface opposite to the side wall portion 22 of the short-circuit fitting 2). An arcuate gear receiving portion 43 having an inner surface with internal teeth formed along the periphery of the shaft hole 41 is formed to protrude. The gear receiving portion 43 is formed with external teeth on the outer periphery that can engage the claw portion 9 of the movable body 8 described above, and a through hole 45a having the same diameter as the shaft hole 41 is formed in the center. 45 is engaged with the gear receiving portion 43 and attached to the periphery of the shaft hole 41 so as to rotate integrally with the operation lever 4.

The claw portion 9 is formed in a shape that allows rotation in only one direction of the gear 45 in a state in which the claw portion 9 is engaged with the gear 45. When moving downward, the operating lever 4 can be moved by changing the meshing position of the claw portion 9 and the external teeth of the gear 45. However, even if the operating portion 42 is moved upward, the claw portion 9 is meshed. The position is fixed, and the operation lever 4 cannot be moved.
The gear 45 is formed separately from the operation lever 4 in this example, but may be formed integrally with the operation lever 4.

  Further, on the other side surface of the operation lever 4 (the side surface facing the side wall portion 22 of the short-circuit fitting 2 in a state where the operation lever 4 is attached to the boss portion 73, that is, the side surface opposite to the side plate portion 71 of the base body 7). Is formed with a spring mounting convex portion 46 for attaching the torsion coil spring 63 by projecting the peripheral edge of the shaft hole 41 in an annular shape, and the other end of the torsion coil spring 63 is engaged with a portion away from the spring mounting convex portion 46. The pin 47 to be stopped is fixed by means such as screwing or press fitting.

  The jaw 5 is attached so as to straddle the upper surface of the end opposite to the operation portion 42 with the rotation center of the operation lever 4 as a boundary, and protrudes in parallel from the jaw body 51 and both side edges of the jaw body 51. And a pair of bearing portions 52. The pair of bearing portions 52 are formed with through holes 52a at positions where they are aligned with each other, and the operation lever 4 is inserted between the through holes 48 formed at the end portions of the operation lever and the bearing portions 52. The shaft member 53 is inserted into the shaft 52a, and the shaft member 53 is attached to the operating lever 4 so as to be rotatable around the shaft member 53 by attaching the shaft member 53 with the split pin 54 so as not to be detached.

  Further, a leaf spring 55 is fixed by screws 56 between the operation lever 4 and the jaw main body 51 of the jaw 5 on the upper surface of the end portion of the operation lever 4 to which the jaw 5 is attached. While allowing the movement, the upper surface of the jaw 5 is held in a state of facing the inner surface of the hook portion 21 so as not to rotate too much about the shaft member 53.

  In order to assemble the overhead wire side clamping body 1 described above, the movable piece 32 of the movable body 8 is inserted between the fixed piece 31 of the base body 7 and the stopper piece 72 and the head portion 81 of the movable body 8 is fixed to the base body 7. The movable body 8 is mounted on the base body 7 and the gear 45 is engaged with the gear receiving portion 43 of the operation lever 4 so that the shaft hole 41 of the operation lever 4 is engaged. The operating lever 4 is attached to the boss 73 of the base 7 so that the gear 45 faces the side plate 71 of the base 7 in this state.

Further, the torsion coil spring 63 is externally mounted on the spring mounting convex portion 46 of the operation lever 4, and the other end of the torsion coil spring 63 is engaged with the pin 47 fixed to the operation lever 4. The side wall portion 22 is brought close to the boss portion 73 so that one end of the torsion coil spring 63 is locked to the pin 64 fixed to the side wall portion 22 and the other end of the tension spring 68 is attached to the same pin 64. As a result, a state in which an urging force is always applied upward to the operation portion 42 of the operation lever 4 (a state in which the urging force is applied in a direction in which the jaw 5 is always separated from the hook portion 21) is formed. A state in which the urging force is always applied in the direction in which the movable piece 32 is always separated from the fixed piece 31, that is, the direction in which the claw portion 9 meshes with the external teeth of the gear 45 is formed.
Then, the side wall portion 22 of the short-circuit fitting 2 and the base body 7 are fixed to each other by tightening bolts 62 and screws 65.

  The axial thickness of the shaft hole 41 of the operation lever 4 including the gear receiving portion 43 protruding from one side surface of the operation lever 4 and the spring mounting convex portion 46 protruding from the other side surface. Is set to be slightly smaller than the distance between the side plate portion 71 of the base body 7 and the side wall portion 22 of the short-circuit fitting 2, and the operation lever 4 smoothly rotates around the boss portion 73 below the hook portion 21. It has come to be.

  Further, in this example, the boss 73 of the base body 7 is attached near one side edge in the middle of the short-circuit fitting 2 so that the operation portion 42 of the operation lever 4 protrudes from the short-circuit fitting 2 to the side, and the jaw 5 Is not protruded from the other side edge of the short-circuit fitting 2, and when the operating lever 4 is rotated around the boss portion 73, the jaw 5 can move up and down within a range facing the hook portion 21. It has become.

  In the above configuration, in order to attach the overhead wire side clamping body 1 to the overhead electric wire, as shown in FIG. 2, a pair of gripping pieces (a fixed piece 31 and a movable piece 32) are held by a gripping tool (in this example, an insulating jacket). It is gripped by 150 gripping portions 151. Then, the movable piece 32 moves relative to the fixed piece 31 against the spring force of the tension spring 68, and the claw portion 9 fixed to the head portion 81 of the movable body 8 moves the gear 45. The operation lever 4 is separated from the outer teeth, and the operation lever 4 is in a state in which the jaw 5 is most separated from the hook portion 21 due to the spring force of the torsion coil spring 63. It will be in the state which protruded (state in which the operation part 42 becomes horizontal).

  In a state where the pair of gripping pieces (the fixed piece 31 and the movable piece 32) are gripped by the gripping tool, the overhead wire side holding body 1 is lifted, approached to the overhead electric wire, and the hook portion 21 is peeled off from the overhead wire The gripping tool 150 is separated from the pair of gripping pieces. Then, the gripping portion 151 of the gripping tool 150 is hooked on the operation portion 42 of the operation lever 4 and the operation portion 42 of the operation lever 4 is pulled downward as it is.

  Then, the operating lever 4 rotates while the claw portion 9 is engaged with the external teeth of the gear 45, and the jaw 5 is centered on the boss portion 73 and the distance between the centers of the boss portion 73 and the shaft member 53 is defined as the radius. As shown in FIG. 4, the core wire 160 a of the overhead electric wire 160 is sandwiched between the inner surface of the hook portion 21 and the upper surface of the jaw 5.

  Even if the gripping tool 150 is separated from the pair of gripping pieces after the hook part 21 and the jaw 5 hold the overhead electric wire 160, the claw part 9 is engaged with the gear 45 and the control lever 4 rotates in reverse. Therefore, the state where the electric wire 160 is sandwiched is maintained, and the short-circuit wire 102 is electrically connected to the core wire 160a of the overhead wire 160 via the short-circuit fitting 2, that is, the overhead wire 160 is grounded. A state is formed.

  At this time, the smaller the wire diameter is, the lower the operation lever 4 needs to be lowered. Even in such a case, the jaw 5 is rotatably attached to the end of the operation lever 4 while being held by the leaf spring 55. Therefore, in a state where the operation portion 42 of the operation lever 4 is lowered until a response to sandwich the overhead electric wire 160 is obtained and the electric wire 160 is sandwiched between the hook portion 21 and the jaw 5, the upper surface of the jaw 5 is the electric wire 160. It will be in the state pressed along and can be made to clamp firmly.

  When the overhead wire side holding body 1 is removed from the state of being hooked on the overhead electric wire 160 as described above, the gripping tool 150 is approached to the overhead wire side holding body 1 and a pair of gripping pieces (the fixed piece 31 and the movable piece 32). ) From below. Then, the movable piece 32 moves relatively so as to be close to the fixed piece 31 against the tension spring 68, and the claw portion 9 fixed to the movable piece 32 moves to the external teeth of the gear 45. Deviate from. For this reason, the operating portion 42 of the operating lever 4 is returned upward by the spring force of the torsion coil spring 63, and the jaw 5 is in the state farthest from the hook portion 21. Therefore, if the hook part 21 is removed from the overhead wire 160 in a state where the pair of grip pieces are gripped by the gripping tool 150, the overhead wire side clamping body 1 can be removed from the overhead wire 160.

  In the above, an example in which the single overhead wire side clamping body 1 is attached to the overhead electric wire 160 has been shown. However, in the three-phase three-wire system, an operation of attaching the overhead wire side clamping body 1 to each of the three wires is required. In this case, a temporary support 170 as shown in FIG. 5 is attached to the short-circuit fitting 2 of one overhead wire side holding body 1.

  The temporary support 170 is provided on the back surface of the temporary support plate 171 and the temporary support plate 171 that are covered so as to overlap the hook portion 21 and the side wall portion 22 of the short-circuit fitting 2 of the overhead wire side holding body 1 from the outside. And a pair of temporary support rods 172 projecting perpendicularly to the back surface, and the lower portion of the temporary support plate 171 is disposed below the side wall portion 22 of the short-circuit fitting 2 of the overhead wire side holding body 1. The screw 173 can be attached. The pair of temporary support bars 172 are provided in parallel at a predetermined interval, and the hook portion 21 of the other overhead wire side holding body 1 can be inserted between the temporary support bar 172 and the temporary support bar 172. The interval is set to about.

  Therefore, when grounding three wires using such a temporary support 170, first, the overhead wire covering of the three-phase electric wire is covered with an indirect live wire stripping tool (not shown). The core wire is exposed, and the other two overhead wire holding members 101 are temporarily attached to a pair of temporary support rods 172 of the temporary support member of the overhead wire holding member 101 to which the temporary support member 170 is attached. (The hook part 21 of the short-circuit fitting 2 of the overhead wire side holding body 101 is hooked on the temporary support bar 172).

At this time, since the operation lever 4 protrudes to the side of each overhead wire side holding body 101, the temporary support tool 170 is set so that the operation lever 4 does not interfere with the overhead wire side holding body 101 to which the temporary support tool 170 is attached. The operating lever 4 is directed to the opposite side of the short-circuit fitting 2 of the attached overhead wire-side holding body 101 and the short-circuit fitting 2 of each overhead-wire-side holding body 101 is hooked on the temporary support rod 172 (so that the short-circuit fitting 2 is directed in the same direction). Hook).

  Then, the pair of gripping pieces of the overhead wire side holding body 101 to which the temporary support tool 170 is attached is gripped and lifted by the gripping tool 150, the overhead wire side holding body 101 to which the temporary support tool 170 is attached is brought close to the electric wire, and the short-circuit bracket The hook part 21 of 2 is hooked on the part from which the coating of the electric wire was peeled off. Then, when the gripping state by the gripping tool 150 is released and the operation lever 4 is pulled and rotated downward, the jaw 5 comes close to the hook portion 21 and the electric wire is sandwiched between the hook portion 21 and the jaw 5. Is possible.

  Thereafter, the other two overhead wire side clamping bodies 101 attached to the temporary support 170 are also sequentially gripped with the gripping tool 150 and removed from the temporary support bar 172, and the other wires are covered. Ground each wire by attaching it to the stripped part in the same way.

  Therefore, according to the configuration described above, the overhead electric wire 160 can be clamped between the hook portion 21 and the jaw 5 only by operating the operation lever 4 using the clutch mechanism constituted by the claw portion 9 and the gear 45. In addition, it is possible to release the state in which the electric wire is held between the hook portion 21 and the jaw 5 simply by gripping the pair of gripping pieces (the fixed piece 31 and the movable piece 32) with the gripping tool 150. When attaching the overhead wire side clamping body 101 to an overhead electric wire, the operation of rotating the gripping tool 150 is not required, and it can be easily attached to and detached from the overhead electric wire, greatly reducing the burden on the operator's arm. As a result, the working time can be greatly shortened.

  Further, in the above-described configuration, when approaching the overhead wire side holding body 101 to the overhead wire or attaching / detaching the overhead wire to / from the overhead wire, only the operation of gripping the pair of grip pieces with the gripping tool and the operation of rotating the operation lever 4 are performed. Therefore, there is no need to attach a common operation rod, and there is no need to attach and remove the common operation rod by aligning the shaft center with the joint bracket as in the past. Is possible.

DESCRIPTION OF SYMBOLS 1 Overhead side clamping body 2 Short-circuit metal fitting 3 Grasping part 4 Operation lever 5 Jaw 9 Claw part 21 Hook part 31 Fixed piece 32 Movable piece 42 Operation part 45 Gear 55 Leaf spring 63 Torsion coil spring 68 Pull spring 102 Short-circuit wire 150 Gripping tool 160 Overhead wire 170 Temporary support

Claims (4)

A short-circuit fitting composed of a conductor to which a short-circuit wire connected to a ground wire is provided with a hook portion hooked to an overhead electric wire at the upper end portion;
Provided with a pair of gripping pieces that can be gripped by a gripping tool, one of the gripping pieces is a fixed piece fixed to the short-circuit fitting, and the other gripping piece is a movable piece that moves away from or closer to the one gripping piece A gripped part;
An intermediate lever is rotatably supported with respect to the short-circuit fitting, and an operation lever having an operation part on one end side with the rotation center as a boundary,
A jaw that is provided on the other end side with the rotation center of the operation lever as a boundary, and whose distance from the hook portion is variable by the rotation of the operation lever;
The state of the jaw close to the hook portion is maintained, and the pair of gripping pieces are held by the gripping tool to release the state of the jaw close to the hook portion, so that the jaw is hooked. State holding / releasing means for separating from the part;
A sandwiching body for a grounding short-circuit device, comprising: The state maintaining / releasing means is
A gear that rotates with the operation lever so that the rotation center of the operation lever and the axis coincide with each other;
A claw portion that is provided on the movable piece and allows only rotation in one direction of the operation lever so as to bring the jaw close to the hook portion in a state of being engaged with the gear;
A first spring that constantly biases the movable piece in a direction in which the claw portion meshes with the gear;
A second spring that constantly applies an urging force for rotating the operation lever in a direction in which the jaw is separated from the hook portion;
The sandwiching body for a ground short-circuit instrument according to claim 1, comprising:   The said jaw is rotatably attached with respect to the said operation lever, and is urged | biased by the 3rd spring so that the upper surface may oppose the said hook part. Clamp for grounding short circuit device.   The grounding short-circuiting instrument clamping body according to any one of claims 1 to 3, wherein the short-circuiting fitting is provided with a temporary support that holds another grounding short-circuiting instrument clamping body.

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