JP4854600B2 - Grounding tool - Google Patents

Description

  The present invention is for connecting a ground wire of a short-circuit grounding device for short-circuiting an electric circuit to an earth-side ground terminal in order to ensure the safety of an operator in a power outage operation in an indoor / outdoor electric facility such as a substation. It relates to a grounding tool.

When a power failure is performed in an indoor / outdoor electrical facility such as a substation, the electric circuit is connected to a grounding terminal on the earth side through a grounding wire of a short-circuit grounding device in order to ensure the safety of the worker. As a grounding tool for connecting a grounding wire to a grounding terminal of an electric device or a grounding wire, a grounding metal fitting capable of holding the grounding terminal with a butterfly bolt at the end of the grounding wire of a short-circuiting grounding device is known. (For example, refer to Patent Document 1). According to such a grounding metal fitting, an operator who performs a power outage operation loosens the butterfly bolt and sandwiches the ground terminal therebetween, and then tightens the butterfly bolt to sandwich the ground terminal.
JP 2000-278830 A

  However, in such a grounding tool, the tightening force to the grounding terminal or the like varies depending on the arm strength of the operator. If the tightening is insufficient, the grounding tool may come off from the grounding terminal or the like due to the contact of the worker with the grounding wire or electromagnetic force when the grounding wire is energized. Further, it is difficult to visually confirm the tightening condition of the grounding tool to the grounding terminal or the like. Therefore, in order to secure the fastening of the grounding tool to the grounding terminal, the person in charge of the work again needs to confirm that there is no looseness by retightening.

  An object of the present invention is to provide a grounding tool that allows an operator to easily and reliably connect a ground wire of a short-circuit grounding device to a grounding terminal and obtain a certain tightening force.

  The present invention is a grounding tool for connecting a grounding wire of a short-circuit grounding device to a grounding terminal, wherein the U-shaped main body electrically connected to the grounding wire is sandwiched between the grounding terminal and the inside of the main body. A clamping unit, an operation unit provided on a portion of the main body opposite to the clamping unit, and a state in which the grounding terminal is clamped and a state in which the grounding terminal is opened according to an operation of the operation unit. It is characterized by comprising an actuating mechanism to be changed and a fixing member for fixing the clamping part in a clamping state.

  According to the grounding tool of the present invention, the operator can easily ground the short-circuit grounding device by operating the operation unit, interposing the grounding terminal in the opened clamping unit and clamping the grounding terminal in the clamping unit. The wire can be connected to a ground terminal. Moreover, since the clamping part which clamped the grounding terminal is fixed by the fixing member, the grounding terminal can be securely clamped with a constant force regardless of the tightening force of the operator. Further, whether or not the sandwiching portion is fixed by the fixing member can be easily confirmed visually.

  The fixing member is preferably a hook member that fixes the operation portion to the main body. Accordingly, it is possible to easily realize a configuration in which the operation unit is fixed by the hook member in a state where the holding unit holds the ground terminal, and the holding unit is fixed in the holding state.

  The operation portion is a handle having a fulcrum on the main body, the main body has a through hole between the handle and the clamping portion, and the operating mechanism includes the handle and the handle It is preferable to provide a connecting rod that is connected to the holding portion and slides in the through hole. With this configuration, the handle can be easily operated by the lever principle around the fulcrum provided on the main body side. Then, by operating the handle, the connecting rod connected to the handle slides in the through hole, and the clamping portion connected to the other end side moves. Thereby, the mechanism which changes a clamping part into a clamping state and an open state by the handle as an operation part is easily realizable.

  The clamping unit preferably includes a position adjustment member that adjusts a clamping width in the clamping state. Thus, by adjusting the clamping width for the ground terminals having different shapes and sizes, the ground terminals and the ground wires of the electric devices having different shapes and sizes can be easily and reliably sandwiched.

  The grounding tool of the present invention preferably includes an urging means for urging the clamping portion to a clamping state or an open state. With this configuration, the clamping unit is urged by the urging means so as to be held or opened. Therefore, when the operator is biased so as to be in the clamping state, the operator can clamp the clamping unit with the ground terminal by only performing an operation of opening the clamping unit. On the other hand, when the sandwiching portion is biased to be in the open state, the sandwiching portion can be sandwiched between the ground terminals by performing only the operation of sandwiching the sandwiching portion. As a result, the operator only needs to perform either one of the operations of clamping or opening the clamping unit, so that the work efficiency can be improved.

  As shown in FIG. 1, a grounding fixture 1 as a grounding tool of this embodiment is a tool for connecting a grounding wire X of a short-circuiting grounding tool Z to a grounding terminal Y on the ground side. The end side is attached to, for example, a short-circuit grounding hook W attached to the tip of the insulating rod of the short-circuit grounding device Z. The ground terminal Y to which the ground metal fitting 1 is connected is, for example, a ground terminal or a ground wire of an electric device.

  The grounding metal 1 includes a U-shaped main body 2 electrically connected to the grounding wire X, a first clamping member 3 and a second clamping member 4 provided inside the main body 2, and a first clamping of the main body 2. A handle 5 as an operation unit provided on a portion opposite to the member 3 (outside of the main body 2), and a first sandwiching member 3 and a connecting rod 6 connected to the handle 5 are provided. Further, the grounding metal 1 includes a hook member 7 as a fixing member for fixing the handle 5 and a spring 8 as an urging means provided between the first clamping member 3 and the main body 2.

  The main body 2 is a copper casting rigid body and has a pair of opposing portions 21a and 21b opposite to each other. The opposing portion 21a is provided with a through hole 22, and the opposing portion 21b is opposed to the through hole 22. A female screw hole 23 is formed at the position. A ground wire X is screwed to the end of the main body 2 via a screw tool 24, and the main body 2 and the ground wire X are electrically connected.

  The first clamping member 3 is a copper-cast plate body having irregularities formed on the side that clamps the ground terminal Y, and the other end side is pivotally attached to the connecting rod 6. Since the 1st clamping member 3 is pivotally attached to the connecting rod 6, the connection angle with respect to the connecting rod 6 is variable within a predetermined range.

  The 2nd clamping member 4 is a metal plate body by which the unevenness | corrugation was formed in the side facing the 1st clamping member 3, Comprising: The other end side is connected with the external thread 41 as a position adjustment member. The male screw 41 is a copper screw that is screwed into the female screw 23, and the position of the second clamping member 4 relative to the first clamping member 3 is rotated by rotating an adjustment arm 42 provided at the end. Can be adjusted.

  The male screw 41 is provided with a disk-shaped indicator board 43 at a position adjacent to the adjustment arm 42, and the indicator board 43 indicates the scale of the scale plate 44 attached to the outside of the facing portion 21b. It is like that. The scale of the scale plate 44 not only indicates the length, but also indicates the position where the instruction panel 43 should be aligned according to the type of the ground terminal Y to be sandwiched. In addition, the indication board 43 is provided with cuts radially at a predetermined angle, and the scale plate 44 is slidably attached to a groove provided outside the facing portion 21b. The position of the second clamping member 4 can be fixed by sliding the scale plate 44 into the gap.

  The handle 5 is a frame body in which both ends of two rod bodies having a refracting portion 51 are coupled, and is pivotally attached to the coupling rod 6 so that the refracting portion 51 abuts the outside of the facing portion 21a. Yes. When the handle 5 holds one end of the refracting portion 51 opposite to the side pivotally attached to the connecting rod 6 and pushes it down to the facing portion 21a side, the other end side is pushed up with the refracting portion 51 serving as a fulcrum. . As a result, the connecting rod 6 connected to the other end pushed up is pushed up with respect to the through hole 22. On the other hand, when the handle 5 is pushed up away from the facing portion 21 a, the other end side is pushed down with the refracting portion 51 as a fulcrum, and the connecting rod 6 is pushed down with respect to the through hole 22.

  The connecting rod 6 is a metal rod, the end connected to the handle 6 has a large diameter, and is pivotally attached to the handle 6 by a pin passing through an insertion hole provided in this portion. .

  The hook member 7 is a U-shaped frame, and both end portions thereof are inserted into hole portions 25 provided on both side walls of the facing portion 21a so as to be rotatable around the both end portions. . The hole 25 is located on the other end side of the handle 5 (side connected to the connecting rod 6). When the hook member 7 is rotated, the hook member 7 is engaged with the other end side of the handle 5, The handle 5 is fixed without being pushed down.

  The spring 8 is a coil spring provided so as to surround a part of the connecting rod 6 between the first holding member 3 and the facing portion 21a, and biases the first holding member 3 toward the second holding member 4 side. To do. Therefore, when the handle 5 is not operated by the elastic force of the spring 8, the first holding member 3 is held and held, and the handle 5 is pushed up from the facing portion 21 a side.

  Next, the usage method of the above-mentioned grounding metal fitting 1 is demonstrated easily.

  The grounding metal 1 is used to connect one end of the grounding wire X of the short-circuit grounding device Z to the grounding-side grounding terminal Y at the time of a power failure operation. Specifically, the worker who performs the power failure work attaches the grounding metal fitting 1 to the grounding terminal Y on the earth side during the power failure work, and then attaches the short-circuit grounding hook W of the short-circuit grounding device Z to the electric circuit performing the power failure work. .

  In order to connect the ground wire X to the ground terminal Y, the operator first checks the type of the ground terminal Y. This is because the ground terminal Y has a different shape and size depending on its type.

  Then, according to the type of the ground terminal Y, the adjustment arm 42 of the ground metal fitting 1 is rotated so that the indication panel 43 is adjusted to the scale indicated on the scale plate 44. For example, when the type of the grounding terminal Y to which the grounding metal 1 is connected is A type, the operator rotates the adjustment arm 42 so that the indication panel 43 is at the position A shown on the scale plate 44. Match.

  Next, the handle 5 is gripped, the handle 5 is pushed down to the facing portion 21 a side, and the first holding member 3 is separated from the second holding member 4. In this state, the ground terminal Y is interposed between the first clamping member 3 and the second clamping member 4, and the hand is released from the handle 5. When the hand is released from the handle 5, the first clamping member 3 moves to the second clamping member 4 side by the elastic force of the spring 8 provided between the first clamping member 3 and the main body 2. It is automatically pushed up against the facing portion 21a.

  When the ground terminal Y is clamped by the first clamping member 3, the operator rotates the hook member 7 to engage with the other end of the handle 5. At this time, the ground terminal Y is clamped between the clamp 3 and the second clamp member 4 with a constant tightening force.

  As described above, according to the grounding metal fitting 1 of the present embodiment, the grounding terminal Y can be easily and easily sandwiched between the first clamping member 3 and the second clamping member 4 by operating the handle 5. . Further, by adjusting the position of the second clamping member 4 according to the type of the ground terminal Y, various ground terminals Y can be clamped with a constant tightening force. Moreover, the position of the 2nd clamping member 4 can be fixed to arbitrary positions by sliding the scale plate 44 in the notch | incision of the instruction | indication board 43. Furthermore, since the handle 5 is fixed by the hook member 7 in the clamping state, the ground terminal Y can be reliably clamped with a constant tightening force regardless of the arm strength of the operator. In addition, it can be visually confirmed whether or not the first clamping member 3 is fixed by the hook member 7, and it can be easily confirmed whether or not the ground terminal Y is securely clamped.

  Next, a modification of this embodiment will be described with reference to FIG.

  In this case, the grounding metal fitting 1 is formed by pivotally attaching a rod-like handle 5 to the outer end portion of the facing portion 21a. A connecting rod 6 and a tongue 71 as a hook member are respectively attached to the handle 5 by being pivotally attached thereto.

  Further, a buckle 72 with which the tongue 71 is engaged is embedded in a part of the main body 2. The buckle 72 disengages the engaging portion 72b from the insertion opening 72a into which the tongue 71 is inserted, the engaging portion 72b that engages with the groove portion 71a of the inserted tongue 71 by the biasing force of the spring (not shown). And a slide member 72c.

  Further, a spring 8 is provided between the handle 5 and the facing portion 21a so as to surround the connecting rod 6, and the handle 5 is pushed up from the facing portion 21a side when the operation is not performed. The first clamping member 3 and the second clamping member 4 are separated from each other.

  When using this grounding metal fitting 1, the operator positions the grounding terminal Y between the first clamping member 3 and the second clamping member 4 and pushes down the handle 5 to the facing portion 21 a side. As a result, the first clamping member 3 moves to the second clamping member 4 side by the connecting rod 6 coupled to the handle 5, and the first clamping member 3 clamps the ground terminal Y. At this time, the tongue 71 connected to the handle 5 is inserted into the insertion opening 72 a of the buckle 72, and the engaging portion 72 b engages with the groove portion 71 a of the tongue 71. As a result, the handle 5 is fixed, and the first holding member 3 is fixed in a state where the ground terminal Y is held.

  On the other hand, when the ground terminal Y is released from the first clamping member 3, the slide member 72 of the buckle 72 is slid to disengage the engagement portion 72 from the groove portion 71a. Then, the handle 5 is pushed up from the facing portion 21a side by the spring 8 provided between the handle 5 and the facing portion 21a, the first holding member 3 is separated from the second holding member 4, and the ground terminal Y is connected. Easy to remove.

  Although the present embodiment of the present invention has been described above, the present invention is not limited to this. For example, the fixing member for fixing the handle is a handle stop or the like sandwiched between the handle and the facing portion. It may be a member.

The perspective view which shows the grounding metal fitting of the short circuit grounding fixture of embodiment. The perspective view which shows the modification of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Grounding metal fitting (grounding tool), 2 ... Main body, 3 ... 1st clamping member, 4 ... 2nd clamping member, 5 ... Handle (operating part), 6 ... Connecting rod (operating mechanism), 7 ... Hook member (fixing) Member), 8 ... spring (biasing means), 22 ... through hole, 41 ... male screw (position adjusting member), X ... ground wire, Y ... ground terminal, Z ... short-circuit grounding tool, W ... short-circuit grounding hook.

Claims (5)

A grounding tool for connecting a ground wire of a short-circuit grounding device to a ground terminal,
A U-shaped body electrically connected to the ground wire;
A clamping part for clamping the ground terminal inside the main body;
An operation portion provided at a portion of the main body opposite to the clamping portion;
An actuation mechanism that changes the clamping unit between a state of clamping the ground terminal and a state of opening the grounding terminal according to an operation of the operation unit;
A grounding tool comprising: a fixing member that fixes the sandwiching portion in a sandwiched state. The grounding tool according to claim 1, wherein
The grounding tool, wherein the fixing member is a hook member that fixes the operation portion to the main body. The grounding tool according to claim 1 or 2,
The operation unit is a handle having a fulcrum on the main body,
The main body has a through hole between the handle and the clamping portion;
The operating mechanism includes a connecting rod that is connected to the handle and the holding portion and slides in the through hole. The grounding tool according to any one of claims 1 to 3,
The said clamping part is provided with the position adjustment member which adjusts the clamping width in a clamping state, The grounding tool characterized by the above-mentioned. The grounding tool according to any one of claims 1 to 4,
A grounding tool comprising urging means for urging the clamping part to a clamping state or an open state.

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