JP2016220380A - Ground shorting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground shorting device capable of reliably exhibiting a short-circuiting function even when an electric current is mistakenly applied.SOLUTION: The ground shorting device comprises a pair of holding parts 3 and 4 arranged so as to be opposed to each other so as to sandwich the covered electric wire 2, and a mechanism part 5 for relatively moving the pair of holding parts 3, 4 toward or away from each other. At least one holding part 4 of the pair of holding parts includes the conducting portion that is cut into the insulating coating 2B of the covered electric wire 2 and is electrically connected to the core wire 2A when the covered electric wire 2 is sandwiched by bringing the pair of holding parts 3, 4 close to each other by the mechanism part 5, the conductive portion being connected to the ground line 6. The conducting portion is provided with a cutting edge 4A for cutting into the covered electric wire 2. The cutting edge includes a pointed blade portion 4b1 for cutting into the insulating coating 2B, and a side surface that is electrically connectable to the core wire 2A and is configured to be in surface contact with the outer circumferential arc surface of the core wire 2A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a grounding and short-circuiting device for short-circuiting an electric circuit for the safety of an operator during a power outage operation in an electric facility.

  For example, when electrical work is performed on an aerial distribution line, measures are taken to ensure the safety of the operator even if the work section that has been cut off is accidentally energized. Specifically, a grounding short-circuit device is electrically connected to the overhead power distribution line, and the grounding conductor ground or the ground side grounding is buried in the ground via the ground wire connected to the ground short-circuiting device. Electrical connection to terminal.

  As said earthing | grounding short circuit instrument, the thing of two forms is disclosed by patent document 1, for example. The ground short-circuit instrument of the 1st form is provided with the electric wire connection part electrically connected to the core wire of a covered electric wire, and the ground wire by which one end was connected to this electric wire connection part. The electric wire connecting portion includes a first electric wire receiving portion and a second electric wire receiving portion having a semicircular cross section corresponding to the shape of the electric wire, and a needle electrode protruding upward in the lower second electric wire receiving portion. Configured. Accordingly, when the electric wire is sandwiched between the first electric wire receiving portion and the second electric wire receiving portion, the needle electrode of the second electric wire receiving portion pierces the insulating coating of the covered electric wire and comes into contact with the core wire. Thereby, it will be in the state by which the electric wire connection part was electrically connected to the core wire.

  The ground short-circuit instrument of the 2nd form is provided with the electric wire connection part electrically connected to the core wire of a covered electric wire, and the ground wire by which one end was connected to this electric wire connection part. The electric wire connecting portion includes a first electric wire receiving portion and a second electric wire receiving portion having a semicircular cross section corresponding to the shape of the electric wire, and each of the first electric wire receiving portion and the second electric wire receiving portion includes: A semicircular blade is formed. Accordingly, when the electric wire is sandwiched between the first electric wire receiving portion and the second electric wire receiving portion, the blade of the first electric wire receiving portion and the blade of the second electric wire receiving portion are cut into the insulating coating of the covered electric wire, and both the blades are in contact with the core wire. . Thereby, it will be in the state by which the electric wire connection part was electrically connected to the core wire.

Japanese Patent Laying-Open No. 2009-290983 (see FIG. 1 and FIGS. 4 (a) and 4 (b))

  In the ground short-circuit instrument according to the first aspect, the needle electrode of the second electric wire receiving portion pierces the insulation coating of the covered electric wire and comes into contact with the core wire, that is, the tip of the needle electrode makes a point contact with the core wire, thereby connecting the electric wire. The part is electrically connected to the core wire. Further, the ground short-circuit instrument of the second form is such that the blade of the first wire receiving portion and the blade of the second wire receiving portion are cut into the insulating coating of the covered electric wire, and both the blades are in contact with the core wire of the electric wire. When the wire contacts the core wire, the electric wire connecting portion is electrically connected to the core wire.

  As described above, when the needle electrode makes point contact with the core wire or when the blade of the first wire receiving portion and the blade of the second wire receiving portion make line contact with the core wire, the wire connecting portion is electrically connected to the core wire. Therefore, a sufficient contact area with the core wire cannot be taken. If the contact area with the core wire is not sufficient in this way, the tip of the needle electrode or blade will melt due to a large current when it is energized by mistake, and the short-circuit function as a grounding short-circuiting device will be exhibited. There was room for improvement.

  Then, this invention makes it a subject to provide the earthing | grounding short circuit instrument which can exhibit a short circuit function reliably, even when it supplies with electricity accidentally.

  A grounding short-circuit apparatus according to the present invention includes a pair of sandwiching portions disposed to face each other so as to sandwich a covered electric wire in which a core wire as a conductor is covered with an insulating coating, and the pair of sandwiching portions relatively close to or apart from each other. At least one of the pair of sandwiching portions is cut into the insulation coating of the covered wire when the mechanism portion causes the pair of sandwiching portions to approach the sandwiched wire. A conductive portion electrically connected to the core wire, comprising a conductive portion connected to a ground wire, the conductive portion includes a cutting blade for cutting into the covered electric wire, the cutting blade, A pointed blade portion for cutting into the insulation coating, and a side surface electrically connectable to the core wire, the side surface configured to be in surface contact with the outer circumferential arc surface of the core wire. It is characterized by that.

  According to this configuration, the cutting blade is insulated at the pointed blade part by including the pointed blade part for cutting into the insulating coating and the side surface configured to be in surface contact with the outer peripheral arc surface of the core wire. Since it cuts into the coating and comes into surface contact with the core wire on the side surface, a sufficient contact area between the core wire and the cutting blade can be ensured. Therefore, the cutting blade is not melted by a large current when the current is accidentally energized. Therefore, a large current when energized by mistake can be reliably supplied from the cutting blade to the ground side through the grounding wire.

  Moreover, the grounding short circuit instrument according to the present invention, the cutting blade, a pair of the cutting blades are provided so that the pointed blade portions are opposed to each other, and the side surfaces are opposed inward, the pair of cutting blades, The pointed blade portions are arranged to face each other so as to be separated from each other by a distance smaller than the diameter of the core wire, and when the cutting blade further cuts in a state where the both pointed blade portions are in contact with the core wire, You may be comprised so that the blade parts may bend in the direction which spaces apart.

  According to this configuration, when the covered electric wire is cut with the pointed blade part, the pointed blade part comes into contact with the core wire. When the cutting is further performed, the cutting blade is cut while being bent in a direction in which the pointed portion is separated, and comes into surface contact with the side surface. That is, the pointed blade portion cuts along the boundary between the core wire and the insulating coating, and comes into surface contact with the side surface core wire. Therefore, the core wire is not damaged and can be reliably contacted with the core wire.

  In the ground short-circuit instrument according to the present invention, when the tip end surface of the pointed blade part is further cut in a state of being in contact with the core wire, the pointed blade part is guided to bend in a direction away from each other. It may be inclined.

  According to such a configuration, when further cutting in the state of being in contact with the core wire, the tip surface of the tip of the tip blade portion becomes a guide surface, and the tip blade portion can be easily along the core wire without damaging the core wire. Moreover, it can reliably contact the core wire.

  As described above, according to the present invention, the cutting blade includes a pointed blade portion for cutting into the insulating coating and a side surface configured to be in surface contact with the outer peripheral arc surface of the core wire, It is possible to provide a ground short-circuit instrument that can reliably exhibit the short-circuit function.

It is a front view of the earthing short circuit instrument concerning a 1st embodiment of the present invention, and shows the state just before cutting into the insulation covering of a covered electric wire. It is a front view of the grounding short circuit device, and shows a state in which a pair of cutting blades are brought into contact with the core wire and are conducted by cutting into the insulation coating of the covered electric wire. It is the side view made into the partial cross section which shows the principal part of the grounding short circuit instrument. It is a front view of the earthing | grounding short circuit instrument which concerns on 2nd Embodiment of this invention, and has shown the state just before cutting into the insulation coating of a covered electric wire. It is a front view of the earthing | grounding short circuit instrument which concerns on 3rd Embodiment of this invention, and has shown the state just before cutting into the insulation coating of a covered electric wire. (A), (b) is a front view which shows the principal part of the earthing | grounding short circuit instrument which concerns on other embodiment. It is a front view which shows the principal part of the earthing | grounding short circuit apparatus which concerns on other embodiment, (a) shows the state just before cutting into the insulation coating of a covered electric wire, (b) cuts into the insulation coating of a covered electric wire, and is a core wire. A state where the pair of cutting blades are brought into contact with each other is shown.

  A ground short-circuit apparatus according to the present invention will be described with reference to the drawings.

<First Embodiment>
As shown in FIGS. 1 to 3, the grounding short-circuiting device 1 includes a pair of sandwiching portions 3 and 4 and a pair of sandwiching portions 3 that are opposed to each other in the vertical direction so that the covered electric wire 2 can be sandwiched in the vertical direction. , 4 relatively close to or away from each other.

  The covered electric wire 2 has a circular outer shape made of a core wire 2A made of a conductor (for example, various metal materials) that conducts electricity and an insulator (for example, various synthetic resin materials) that covers and covers the core wire 2A. Insulating coating 2B.

  The upper clamping part 3 which is one clamping part is composed of a conductive material (for example, various metal materials), and a lower plate part 3A having a screw hole 3N formed at a substantially central part, and a lower plate part 3A. A vertical plate portion 3B extending upward from one end in the width direction, a mountain-shaped upper plate portion 3C protruding upward from the upper end of the vertical plate portion 3B in a front view and receiving the upper end portion of the covered electric wire 2, and an upper plate portion 3C A detachment prevention plate portion 3D for hanging downward from the other end in the width direction to prevent the covered electric wire 2 from moving to the other end side in the width direction of the upper plate portion 3C and detaching from the upper plate portion 3C to the side. I have.

  One end of the ground wire 6 is fixed to the outer surface (the right side surface in FIG. 1) of the lower end portion of the vertical plate portion 3B with a screw 7. The other end of the ground wire 6 is electrically connected to a ground conductor ground (not shown) or a ground-side ground terminal (not shown) buried in the ground through a common ground wire to be described later. The

  The lower clamping part 4 which is the other clamping part is cut into the insulation coating 2B of the covered electric wire 2 and electrically connected to the core wire 2A by approaching the upper clamping part 3 by the mechanism part 5. Part. Further, the lower clamping part 4 constitutes a conduction part connected to the ground line 6. Therefore, the lower clamping unit 4 constitutes a conduction unit that connects the core wire 2 </ b> A and the ground wire 6 via the upper clamping unit 3.

  The conduction part 4 includes a pair of cutting blades 4A and 4A for cutting into the insulating coating 2B of the covered electric wire 2.

  A pair of cutting blades 4A and 4A are provided on both sides in the width direction with a plurality of light emitting diodes 8A and 8A (two or two in FIG. 1 but may be an arbitrary number or one) interposed therebetween. Is arranged. The detection unit 8 includes a battery (not shown) and an electric circuit configured such that when the cutting blades 4A and 4A are in contact with the core wire 2A, the light emitting diodes 8A and 8A and the battery form a closed circuit. I have.

  The pair of cutting blades 4A and 4A includes a fixing portion 4a fixed to the upper end of a base portion 10 that is detachably fixed to the upper end of a screw shaft 12 described later by a butterfly bolt 9, and upward from the fixing portion 4a. A pair of extending blade portions 4b, 4b is provided. As shown in FIGS. 1 and 3, the base portion 10 is configured as a rectangular parallelepiped that is long in the extending direction of the covered electric wire 2, and a concave portion 10 </ b> A is formed in the center portion of the base portion 10 from the lower end to the upper side. An upper end portion of a screw shaft 12 which will be described later is inserted into the concave portion 10 </ b> A and is fixed by the butterfly bolt 9. An annular groove 12M is formed at the upper end portion of the screw shaft 12 described later, and the tip of the screw portion 9A of the butterfly bolt 9 enters the groove 12M. With this configuration, the base portion 10 is configured not to rotate (co-rotate) together even if the screw shaft 12 rotates. The pair of blade portions 4b and 4b are linear shapes for connecting the tip blade portions 4b1 and 4b1 for cutting into the insulation coating 2B of the covered electric wire 2, and the lower ends of the tip blade portions 4b1 and 4b1 and the upper end of the fixed portion 4a. Connecting portions 4b2 and 4b2. The inwardly facing side surfaces 4d and 4d of the pointed blade portions 4b1 and 4b1 are configured as side surfaces that can be electrically connected to the core wire 2A, and are configured to be in surface contact with the outer circumferential arc surface of the core wire 2A. ing. Further, the tip end blade portions 4b1 and 4b1 are arranged to face each other so as to be separated by a distance smaller than the diameter of the core wire 2A.

  Further, the cutting blades 4A and 4A, when further cutting with the two sharp edge portions 4b1 and 4b1 in contact with the core wire 2A, bend in the direction in which the sharp edge blade portions 4b1 and 4b1 are separated, that is, the sharp edges by the core wire 2A. The blade portions 4b1 and 4b1 are flexible so as to be spread.

  Furthermore, when the tip surfaces 4T and 4T of the blade tips of the sharp blade portions 4b1 and 4b1 are further cut in a state of being in contact with the core wire 2A, the sharp blade portions 4b1 and 4b1 are bent so as to bend away from each other. It is comprised by the inclined surface which guide | induces 4b1. That is, the tip surfaces 4T and 4T of the blade tips of the pointed blade portions 4b1 and 4b1 are formed as inclined surfaces along the tangential direction at the point where they contact the outer peripheral arc surface of the covered electric wire 2. In other words, in FIG. 1, the tip surfaces 4T and 4T of the blade tips of the pointed blade portions 4b1 and 4b1 are formed as inclined surfaces that are positioned upwardly toward the outer side with respect to the axial center of the screw shaft 12 described later.

  The mechanism part 5 includes a connecting part 11 to which an upper end of a general-purpose indirect hot tool (not shown) is connected, and a screw having a lower end fixed to the upper end of the connecting part 11 and a conductive part 4 attached and fixed to the upper end. A shaft 12 and a screw hole 3N formed in the lower plate portion 3A to which the screw shaft 12 is screwed are provided. Therefore, in the state where the upper holding part 3 is positioned and fixed to the covered electric wire 2, the cutting tool at the standby position shown in FIG. 1 is operated by rotating the indirect hot wire tool connected to the connecting part 11 to one side. 4A and 4A can be moved to a conduction position in contact with the core wire 2A of the covered electric wire 2 shown in FIG. Moreover, the cutting blades 4A and 4A at the conduction position shown in FIG. 2 can be moved to the standby position shown in FIG. 1 by rotating the indirect hot tool to the other side opposite to the above.

  The detection unit 8 turns on the two light emitting diodes 8A and 8A from the light-off state (see FIG. 1) when the side surfaces 4d and 4d of the both cutting blades 4A and 4A are in surface contact with the core wire 2A of the covered electric wire 2. (See FIG. 2).

  Next, a procedure for short-circuiting the aerial distribution line with the ground short-circuiting apparatus 1 after a power failure will be described when electrical work is performed on the aerial distribution line. There are three overhead distribution lines, and the grounding short-circuiting device 1 is connected to each of all three overhead distribution lines. However, since the operation procedure is the same, one overhead distribution line is short-circuited. Only the case will be described. In order to short-circuit an aerial distribution line with the ground short-circuiting instrument 1, a first operation for connecting the grounding short-circuiting instrument 1 and the aerial distribution line, and a grounding conductor ground or an earth side grounding buried in the ground A second operation of electrically connecting the terminals is performed. In this case, it is preferable to perform the first operation after performing the second operation (ground treatment). It is preferable to work in this way, even if the power is accidentally energized during the first work, the current can be released to the ground through the ground wire. The grounding wires 6 from the three grounding short-circuiting devices 1 are connected to one common grounding wire (not shown), and the common grounding wire is connected to a grounding conductor ground or ground buried in the ground. It will be connected to the ground terminal on the side. Only the first operation will be described below.

  First, as shown in FIG. 1, the worker hooks the upper holding portion 3 on one covered electric wire 2 constituting the aerial distribution line and positions and fixes it. As shown in FIG. 1, when the lower holding portion 4 is not positioned at the standby position, the covered electric wire 2 is placed on one side in the horizontal direction between the upper holding portion 3 and the lower holding portion 4. Cannot be positioned below the upper clamping part 3 through the gap formed on the right side (right side in FIG. 1). For this reason, the indirect hot-line tool is rotated to place the lower clamping unit 4 at the standby position.

  In a state where the upper holding portion 3 is positioned and fixed to the covered electric wire 2, by rotating the indirect hot wire tool, the screw shaft 12 rotates and the screw shaft 12 moves upward with respect to the fixed lower plate portion 3A. Moving. As a result, the lower holding portion 4 in the standby position in FIG. 1 moves toward the covered electric wire 2 positioned above. As a result of this movement, the tip surfaces 4T and 4T of the blade edges of the pointed blade portions 4b1 and 4b1 are moved directly below the covered electric wire 2, as indicated by three dotted lines in FIG. It cuts into 2B, and moves while contacting and guiding the outer peripheral arc surface of the core wire 2A. At this time, the tip surfaces 4T and 4T of the blade tips of the tip blade portions 4b1 and 4b1 are inclined so as to guide the tip blade portions 4b1 and 4b1 so as to bend away from each other. The surfaces 4T and 4T serve as guide surfaces, making it easier for the cutting blades 4A and 4A to follow the core wire 2A, without damaging the core wire 2A, and reliably contacting the core wire 2A.

  When the pointed blades 4b1 and 4b1 of both the cutting blades 4A and 4A come into contact with the core wire 2A, the two light emitting diodes 8A and 8A are turned on, and the blade edges of the pointed blades 4b1 and 4b1 are the outer periphery of the core wire 2A. The first operation is completed when the surface contacts the arc surface. Since the two light emitting diodes 8A and 8A are lit in this way, it can be surely confirmed that both the tip blade portions 4b1 and 4b1 are in contact with the core wire 2A, which is advantageous in terms of safety.

  When the electrical work on the overhead distribution line is completed, the cutting blades 4A and 4A at the conduction positions indicated by the solid lines in FIG. 1 are positioned at the standby position by rotating the indirect hot wire tool in the direction opposite to the rotation direction. After that, the connection between the common ground line connected to the three ground short-circuiting devices 1 and the ground conductor ground or the ground-side ground terminal buried in the ground is released. Further, the portion where the insulating coating 2B is cut is repaired with a tape or the like.

Second Embodiment
FIG. 4 shows a second embodiment of the ground short-circuit instrument 1. The difference from FIG. 1 is that the upper clamping portion 3 includes two members 30 and 31 in the vertical direction, and a hinge member 32 for connecting the upper first member 30 and the lower second member 31 to each other. It is the point comprised from. If the usage method of the earthing | grounding short circuit instrument 1 comprised in this way is demonstrated, as shown by the dashed-two dotted line of FIG. 4, the lying posture (1st member 30 rotated 90 degree | times with respect to the 2nd member 31 ( After switching to the horizontal posture, the grounding short-circuiting instrument 1 is moved so that the lower clamping part 4 is positioned directly below the covered electric wire 2 (see FIG. 4). In this state, the first member 30 is rotated 90 degrees in the opposite direction to switch the first member 30 to the standing posture (vertical posture), thereby bringing the first member 30 into contact with the upper end of the covered electric wire 2. The upper clamping part 3 is positioned and fixed. The first member 30 is fixed to the second member 31 by a releasable fixing means (not shown). From this state, as described above, by rotating the indirect hot wire tool, the lower holding portion 4 of the standby position is brought close to the covered electric wire 2 positioned above, thereby the cutting blade 4A, The cutting edge of 4A cuts into the insulating coating 2B and comes into surface contact with the core wire 2A. By comprising in this way, the up-down direction length of the upper clamping part 3 and the screw shaft 12 can be shortened compared with FIG. 1, and size reduction of the earthing | grounding short circuit instrument 1 can be achieved. Other configurations not described are the same as those in FIG. 1, and are denoted by the same reference numerals and description thereof is omitted.

<Third Embodiment>
FIG. 5 shows a third embodiment of the ground short-circuit instrument 1. The difference from FIG. 1 is that the upper clamping part 3 is composed of two members 33 and 34 in the vertical direction. In addition, the lower second member 34 is formed with a recess 34A for the extension portion 33A extending downward to enter and exit at the lower end of the upper first member 33, and the upper first member 33 is the lower first member 33. The two members 34 are configured to be slidable in the vertical direction. Explaining how to use the grounding short circuit device 1 configured as described above, as shown by a two-dot chain line in FIG. 4, the first member 33 is slid upward with respect to the second member 34. After switching, the grounding short-circuiting instrument 1 is moved so that the lower clamping part 4 is positioned directly below the covered electric wire 2 (see FIG. 5). In this state, the first member 33 is slid downward, the first member 33 is brought into contact with the upper end portion of the covered electric wire 2, and the upper holding portion 3 is positioned and fixed. The first member 33 is fixed to the second member 34 by a releasable fixing means (not shown). From this state, as described above, the indirect hot wire tool is rotated to bring the lower holding portion 4 of the standby position closer to the covered electric wire 2 positioned above, and the cutting blades 4A, 4A The blade edge comes into surface contact with the outer circumferential arc surface of the core wire 2A. By comprising in this way, the up-down direction length of the upper clamping part 3 and the screw shaft 12 can be shortened compared with FIG. 1, and size reduction of the earthing | grounding short circuit instrument 1 can be achieved. Other configurations not described are the same as those in FIG. 1, and are denoted by the same reference numerals and description thereof is omitted.

  In addition, the earthing | grounding short circuit instrument which concerns on this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change variously.

  For example, the shapes of the cutting blades 4A and 4A may be configured as shown in FIGS. 6 (a) and (b) or FIGS. 7 (a) and (b). That is, FIG. 6A shows the cutting blades 4A and 4A configured in a lateral V shape bent at a substantially central portion in the vertical direction. Thus, even when the cutting blades 4A and 4A are linearly formed, it is possible to make surface contact with the outer peripheral surface of the core wire 2A. Further, FIG. 6B shows the cutting blades 4A and 4A that are wider outward as the upper side is formed and arc surfaces 4H and 4H that are in surface contact with the outer peripheral surface of the core wire 2A are formed on the inner surface. Yes. FIG. 6B shows a state immediately before the arcuate surfaces 4H and 4H of the cutting blades 4A and 4A come into contact with the outer peripheral surface of the core wire 2A. 7A and 7B show cutting blades 4A and 4A that extend straight upward and have a shorter vertical length than that of FIG. 6B. The tip surfaces 4I and 4I of the cutting edges of the cutting blades 4A and 4A are formed as arcuate surfaces that are in surface contact with the outer peripheral surface of the core wire 2A. The cutting blades 4A and 4A are configured such that the tip surfaces 4I and 4I of the cutting edges of the cutting blades 4A and 4A come into surface contact with the outer peripheral surface of the core wire 2A when they contact the outer peripheral surface of the core wire 2A. Thus, the cutting blades 4A and 4A may not move along the core wire 2A. For this reason, even if the cutting blades 4A and 4A are made of an inflexible material, the cutting blades 4A and 4A do not cause troubles such as cracks or breakage, or troubles such as cracks or breakage occurrences. There is little outbreak.

  In the above embodiment, the lower clamping unit 4 approaches or separates from the upper clamping unit 3, but the upper clamping unit 3 approaches or separates from the lower clamping unit 4. However, the structure which both approach or space apart may be sufficient. Further, the two sandwiching portions 3 and 4 can be used in a state of facing each other in the horizontal direction.

  In the above embodiment, the tip surfaces 4T, 4T of the cutting edges of the cutting blades 4A, 4A are shaped so as to have an inclined surface that is located on the upper side so as to come into contact with the outer peripheral arc surface of the covered electric wire 2. It can also comprise in the shape which has an inclined surface which is comprised in the shape which has this, or is located below as the outer side.

  Moreover, in the said embodiment, although a pair of cutting blade 4A, 4A for cutting into the covered electric wire 2 was provided, it can also implement by providing only one cutting blade.

  DESCRIPTION OF SYMBOLS 1 ... Grounding short circuit apparatus, 2 ... Coated electric wire, 2A ... Core wire, 2B ... Insulation coating, 3 ... Upper clamping part, 4 ... Lower clamping part (conduction part), 3A ... Lower board part, 3B ... Vertical board part 3C ... Upper plate portion, 3D ... Prevention plate portion, 3N ... Screw hole, 4A ... Cutting blade, 4H ... Arc surface, 4T ... Tip surface, 4a ... Fixed portion, 4b ... Blade portion, 4b1 ... Pointed blade portion, 4b2 ... connecting portion, 4d ... side surface, 5 ... mechanism portion, 6 ... ground wire, 7 ... screw, 8 ... detecting portion, 8A ... light emitting diode, 9 ... wing bolt, 9A ... screw portion, 10 ... base portion, 10A ... Recessed part, 11 ... connecting part, 12 ... screw shaft, 12M ... groove, 30, 31 ... member, 32 ... hinge member, 33, 34 ... member, 33A ... extending part, 34A ... recessed part

Claims (3)

A pair of sandwiching portions arranged to face each other so that a covered electric wire in which a core wire that is a conductor is covered with an insulating coating can be sandwiched; and a mechanism portion that relatively approaches or separates the pair of sandwiching portions, At least one of the sandwiching portions is electrically connected to the core wire by cutting into the insulation of the covered wire when the mechanism portion causes the pair of sandwiched portions to approach and sandwich the covered wire. A conductive portion connected to the ground wire,
The conducting portion includes a cutting blade for cutting into the covered electric wire, and the cutting blade is a pointed blade portion for cutting into the insulating coating and a side surface that can be electrically connected to the core wire. And a grounding short-circuit device comprising a side surface configured to be in surface contact with the outer circumferential arc surface of the core wire.   A pair of the cutting blades are provided so that the pointed blades face each other and side surfaces face each other inwardly, and the pair of cutting blades are formed such that the pointed blades are larger than the diameter of the core wire. Are arranged so as to be separated from each other by a small distance, and the cutting blade is configured to bend in a direction in which the pointed blade parts are separated from each other when the two edged blade parts are further cut in a state of being in contact with the core wire. The ground short-circuit apparatus according to claim 1, wherein the ground short-circuit apparatus is provided.   The tip surface of the cutting edge of the pointed edge part is inclined so as to be guided so as to bend in a direction in which the edged edge parts are separated from each other when further cutting is performed in contact with the core wire. The ground short-circuit apparatus according to 2.

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