JP4527141B2 - Energy meter grounding device - Google Patents

Description

  The present invention relates to a grounding device for a watt hour meter used for conducting an insulation resistance test of a watt hour meter including a case and a current terminal and a voltage terminal provided at the lower part of the case, and more particularly, various types of watt hour meters. It is related with the grounding apparatus for watt-hour meters which can perform an insulation resistance test automatically and efficiently.

  Conventionally, a test (insulation resistance test) has been performed by using a test apparatus to confirm safety so as not to cause burnout or an accident due to leakage of a watt hour meter. Such an insulation resistance test is performed by measuring the electrical resistance between the current terminal and voltage terminal of the watt hour meter and the case. In this case, the grounded contact is brought into contact with the upper screw on the upper part of the case or the side screw on the side of the case, and the resistance value between the contact and the current terminal (voltage terminal) is measured. Done.

  In this way, when the grounded contact is brought into contact with the upper screw or the side screw of the case, for example, means as shown in FIG. 6 is used. That is, as shown in FIG. 6, a ball chain 50 is used as a grounded contact, and this ball chain 50 is brought into contact with the upper screw 5a or the side screw 5b of the case 2 of the watt-hour meter 1 manually. Next, an insulation resistance test is performed by measuring the resistance value between the ball chain 50 side and the current terminal 3a (voltage terminal 3b) side in this state.

  As described above, since the work of bringing the ball chain 50 into contact with the upper screw 5a or the side screw 5b of the case 2 is all performed manually, especially when conducting an insulation resistance test on a large number of watt-hour meters 1. The work of bringing the ball chain 50 into contact with the upper screw 5a or the side screw 5b is inefficient.

  The present invention has been made in consideration of such points, and an object thereof is to provide a grounding device for a watt hour meter capable of automatically and efficiently performing an insulation resistance test on various types of watt hour meters. And

  The present invention relates to a vertical frame and a back surface of a vertical frame in a grounding device for a watt hour meter used when conducting an insulation resistance test of a watt hour meter including a case and a current terminal and a voltage terminal provided at the lower part of the case. A lifting platform that has an engaging portion that engages with the upper portion of the watt hour meter and that moves up and down so as to be integrated with the watt hour meter so as to take an upper position and a lower position. A telescopic cylinder that is attached and extends from the back side of the vertical frame toward the front side, and a grounding rod that is attached to the tip of the telescopic cylinder and makes contact with the case to test the insulation resistance of the case. When the base is in the lower position, it protrudes from the front surface of the vertical frame by the telescopic cylinder and comes into contact with the case. A power meter ground and wherein the drawn to the surface.

  The present invention is the wattmeter grounding device, wherein the telescopic cylinder is attached to the lifting platform in a state of being inclined obliquely downward from the back side to the front side with respect to the horizontal plane.

  The present invention relates to a vertical frame and a back surface of a vertical frame in a grounding device for a watt hour meter used when conducting an insulation resistance test of a watt hour meter including a case and a current terminal and a voltage terminal provided at the lower part of the case. A lifting platform that has an engaging portion that engages with the upper portion of the watt hour meter and that moves up and down so as to be integrated with the watt hour meter so as to take an upper position and a lower position. An installed guide rail, a grounding rod that is movable along the guide rail from the back side of the vertical frame toward the front side, and that contacts the case to perform an insulation resistance test of the case, and one end of the grounding rod A linear member connected to the end portion and connected to the back surface of the vertical frame at the other end, and the grounding rod is pulled by the linear member when the lifting platform is in the lower position, and the vertical frame Front Together abuts against the casing to al projecting lifting platform is a power meter ground and wherein the drawn to the rear vertical frame when taking the upper position.

  The present invention is a grounding device for a watt hour meter in which a pulley on which a linear member is stretched is attached to a lifting platform.

  The present invention is a grounding device for a watt hour meter in which a spring is interposed between a rear end portion of a grounding rod and a rear end portion of a guide rail.

  In the present invention, a vertical shaft for guiding a lifting platform is provided on the back of the vertical frame, and the lifting platform is biased to an upper position by a spring provided on the outer periphery of the vertical shaft when a watt hour meter is not attached. In addition, when the watt hour meter is attached, the watt hour meter grounding device is lowered to the lower position by the weight of the watt hour meter.

  The present invention is a grounding device for a watt-hour meter, characterized in that a ground wire is attached to a lifting platform.

  The present invention is a grounding device for a watt hour meter characterized in that an inclined surface is formed at the tip of a grounding rod.

  According to the present invention, the grounding rod protrudes from the front surface of the vertical frame by the telescopic cylinder or the linear member when the lifting platform is in the lower position, and comes into contact with the case. Can be performed automatically and efficiently.

  Further, according to the present invention, the lifting platform can be appropriately guided in the vertical direction by the vertical shaft provided on the back surface of the vertical frame. In addition, when the watt hour meter is not attached, the lifting platform is biased to the upper position by the spring, and when the watt hour meter is attached, it is lowered to the lower position by the weight of the watt hour meter. There is no need to provide a separate lifting mechanism on the table.

  Furthermore, according to the present invention, the telescopic cylinder is attached to the lifting platform in a state inclined obliquely downward from the back side to the front side with respect to the horizontal plane, so that the grounding rod interferes with the lifting platform or the like. Without being contacted with the case of the watt hour meter.

  Furthermore, according to the present invention, since the inclined surface is formed at the tip of the grounding rod, even if the position of the upper screw of the case is slightly different depending on the type of watt hour meter, It can be made to contact reliably.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
Here, FIG. 1 is a side view showing the first embodiment of the present invention (when the lifting platform is in the lower position), and FIG. 2 is a side view showing the first embodiment of the present invention. (When the lifting platform is in the upper position). FIG. 3 is a front view showing a first embodiment of the present invention, and FIG. 4 is a perspective view from the back side showing the first embodiment of the present invention.

  First, the outline of the grounding device for watt hour meter according to the present embodiment will be described with reference to FIGS.

  The watt-hour meter grounding device 10 shown in FIGS. 1 to 4 is used when an insulation resistance test of the watt-hour meter 1 is performed.

  This watt-hour meter 1 includes a case 2, a current terminal 3 a and a voltage terminal 3 b provided at the lower part of the case 2, and a transparent cover 4 fixed to the front surface of the case 2. Of these, the case 2 has a case main body 2A made of iron with a coated surface, a metal upper screw 5a fixed to the upper portion of the case main body 2A, and a pair of metal fixed to the side surfaces of the case main body 2A. Side screws 5b. In addition, an engagement hole portion 6 that engages with an engagement portion (hook) 13 of a lifting platform 12, which will be described later, is provided in an upper portion of the case 2 of the watt-hour meter 1. On the other hand, a wire connection 7 for connecting the current terminal 3 a and the voltage terminal 3 b to the test device (not shown) side is installed below the watt hour meter 1. The connector 7 has a terminal 7a in contact with the current terminal 3a and the voltage terminal 3b at the top.

  The insulation resistance test of the watt hour meter 1 measures the electrical resistance between the current terminal 3 a (voltage terminal 3 b) and the case 2 of the watt hour meter 1. In this case, since the surface of the case main body 2A of the case 2 is generally coated with a non-conductive coating, the insulation resistance test is performed using the upper screw 5a or the side screw 5b fixed to the case main body 2A and the current terminal 3a (voltage terminal 3b). ) Is measured by measuring the resistance value between.

  As shown in FIGS. 1 to 4, the watt-hour meter grounding device 10 connects the upper screw 5 a of the case 2 to the ground side (ground side) when performing the insulation resistance test of the watt-hour meter 1. . This watt-hour meter grounding device 10 includes a vertical frame 11 and a lifting platform 12 provided on the back surface of the vertical frame 11 (rightward in FIGS. 1 and 2) so as to be movable up and down.

  Among these, the lifting platform 12 is attached to a vertical portion 12a through which a vertical shaft 16 to be described later passes, and a front surface of the vertical portion 12a (left side in FIGS. 1 and 2), and protrudes forward from the vertical frame 11 and also includes an electric energy. An engaging portion (hook) 13 that engages with the engaging holes 6 of the total 1, a horizontal portion 12b that extends horizontally from the upper end of the vertical portion 12a to the back side, and a rear end of the horizontal portion 12b. And a cylinder mounting portion 12c inclined obliquely upward from the rear end toward the front side.

  The lifting platform 12 moves up and down integrally with the watt-hour meter 1 to take an upper position (FIG. 2) and a lower position (FIG. 1). The vertical portion 12a, the horizontal portion 12b, and the cylinder mounting portion 12c of the lifting platform 12 are all made of conductive metal. Moreover, it is preferable that the vertical part 12a, the horizontal part 12b, and the cylinder attachment part 12c are integrally formed, for example, by bending a metal plate.

  An extendable cylinder 14 extending from the back side of the vertical frame 11 toward the front side is attached to the cylinder mounting portion 12 c of the lifting platform 12. The telescopic cylinder 14 is an air cylinder that can be expanded and contracted by air supplied from an air hose 14a, and includes a metal outer cylinder 14b and a metal rod 14c that is slidably inserted into the outer cylinder 14b. ing. The telescopic cylinder 14 is attached to the cylinder attachment portion 12c of the lifting platform 12 in a state where it is inclined obliquely downward from the back side of the vertical frame 11 toward the front side with respect to a horizontal plane (a plane parallel to the horizontal portion 12b). Yes.

  A grounding rod 15 is attached to the tip of the rod 14c of the telescopic cylinder 14 to contact the upper screw 5a of the case 2 and perform an insulation resistance test of the case 2. As will be described later, the grounding rod 15 protrudes from the front surface of the vertical frame 11 by the telescopic cylinder 14 when the lifting platform 12 is in the lower position, and comes into contact with the upper screw 5a of the case 2, and the lifting platform 12 is in the upper position. In such a case, the telescopic cylinder 14 is drawn into the back side of the vertical frame 11.

  An inclined surface 15 a is formed at the tip of the grounding rod 15, and the inclined surface 15 a is a surface substantially parallel to the vertical frame 11. Therefore, even if the position of the upper screw 5a of the case 2 is slightly different depending on the type of the watt hour meter 1, the grounding rod 15 and the upper screw 5a of the case 2 can be reliably brought into contact with each other by the inclined surface 15a.

  By the way, as shown in FIGS. 1 and 2, a vertical shaft 16 for guiding the lifting platform 12 is provided on the back surface of the vertical frame 11. A spring 17 is provided on the outer periphery of the vertical shaft 16 to urge the lifting platform 12 upward. As a result, the elevator 12 is biased to the upper position (FIG. 2) by the spring 17 when the watt hour meter 1 is not attached, and when the watt hour meter 1 is attached, Due to the weight, the spring 17 moves down to the lower position (FIG. 1) against the urging force of the spring 17.

  Further, on the upper surface of the horizontal portion 12 b of the lifting platform 12, a guide means 18 that has a concave shape or a U shape and guides the grounding rod 15 to the front side of the vertical frame 11 is provided. Further, a ground wire 19 having the other end connected to the ground side is attached to the horizontal portion 12 b of the lifting platform 12.

  On the other hand, a vertical groove 11a extending vertically is formed in the center of the vertical frame 11 (see FIG. 3). The vertical groove 11a has an elongated shape that allows the engaging portion (hook) 13 to pass up and down when the lifting platform 12 moves up and down. The vertical groove 11a has a width through which the grounding rod 15 can pass when the grounding rod 15 protrudes forward of the vertical frame 11.

  When performing the insulation resistance test of the watt-hour meter 1, a plurality of such watt-hour grounding devices 10 are installed side by side in the horizontal direction, whereby a plurality of power amounts corresponding to the respective watt-hour grounding devices 10 are installed. It is preferable to perform a total of 1 insulation resistance tests simultaneously.

Next, the operation of the present embodiment having such a configuration will be described.
First, the watt-hour meter 1 for performing an insulation resistance test is attached to the front surface of the vertical frame 11 in a state where the lifting platform 12 of the grounding device 10 for the watt-hour meter is in the upper position (FIG. 2). In this case, the engagement hole 6 of the watt-hour meter 1 is engaged with the engagement portion (hook) 13 of the vertical frame 11. At this time, the watt hour meter 1 and the lifting platform 12 descend to the lower position (FIG. 1) against the urging force of the spring 17 due to their own weight, and the current terminal 3a and the voltage terminal 3b of the watt hour meter 1 are connected to each other. 7 is in contact with the terminal 7a.

  Next, by supplying air to the air hose 14a of the telescopic cylinder 14, the rod 14c of the telescopic cylinder 14 extends forward. At this time, the grounding rod 15 attached to the tip of the rod 14 c of the telescopic cylinder 14 protrudes from the front surface of the vertical frame 11 and contacts the upper screw 5 a of the case 2.

  Next, an insulation resistance test of the watt-hour meter 1 is performed. In this case, since the grounding rod 15 is in contact with the upper screw 5a of the case 2, the upper screw 5a of the case 2 is connected to the grounding rod 15, the rod 14c of the telescopic cylinder 14, the cylinder mounting portion 12c of the lifting platform 12, and the horizontal. It is electrically connected to the ground side (ground side) via the part 12 b and the ground wire 19.

  After the insulation resistance test of the watt hour meter 1 is completed, the supply of air to the air hose 14a of the telescopic cylinder 14 is stopped. As a result, the rod 14c of the telescopic cylinder 14 is drawn into the outer cylinder 14b.

  Next, the watt-hour meter 1 is removed from the front surface of the vertical frame 11 by removing the engagement hole 6 of the watt-hour meter 1 from the engagement portion (hook) 13 of the vertical frame 11. In this case, the lifting platform 12 is urged upward by the spring 17 and rises to the upper position.

  The telescopic operation of the telescopic cylinder 14 described above is performed by visually confirming that the elevator platform 12 has reached the upper position or the lower position and manually operating the air supply switch. However, the present invention is not limited to this, and the telescopic cylinder 14 may be automatically expanded and contracted by detecting the position of the lifting platform 12 with a sensor or the like.

  Thus, according to the present embodiment, the grounding rod 15 protrudes from the front surface of the vertical frame 11 by the telescopic cylinder 14 and comes into contact with the upper screw 5a of the case 2, so that the insulation resistance test of the watt hour meter 1 is automatically performed efficiently. Can be done well. In particular, in the case of the watt-hour meter 1 for large current, the position of the side screw 5b is generally different depending on the type of the watt-hour meter 1, but the upper screw 5a is substantially in the same position. Therefore, when the grounding rod 15 is brought into contact with the upper screw 5a of the watt hour meter 1, the insulation resistance test of various types of watt hour meters 1 can be performed efficiently.

  Moreover, according to this Embodiment, the raising / lowering stand 12 can be suitably guided to an up-down direction with the vertical shaft 16 provided in the vertical frame 11 back surface. The elevator 12 is urged to the upper position by the spring 17 when the watt hour meter 1 is not attached, and is moved downward by the weight of the watt hour meter 1 when the watt hour meter 1 is attached. Since it descends, it is not necessary to provide a separate lifting mechanism on the lifting platform 12.

  Furthermore, according to the present embodiment, the telescopic cylinder 14 is attached to the lifting platform 12 while being inclined obliquely downward from the back side to the front side with respect to the horizontal plane. It can be brought into contact with the upper screw 5a of the case 2 of the watt-hour meter 1 without interfering with the base 12 or the like.

  Furthermore, according to the present embodiment, since the inclined surface 15 a is formed at the tip of the grounding rod 15, even if the position of the upper screw 5 a of the case 2 is slightly different depending on the type of the watt hour meter 1, Can be reliably brought into contact with the upper screw 5a of the case 2.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.
Here, FIG. 5 (a) is a side view showing the second embodiment of the present invention (when the lifting platform is in the lower position), and FIG. 5 (b) is the second embodiment of the present invention. It is a side view (when an elevator stand exists in an upper position) which shows the form. The second embodiment shown in FIGS. 5 (a) and 5 (b) is different in the configuration for moving the grounding rod, and the other configurations and operational effects are the same as those in the first embodiment described above. is there. 5A and 5B, the same parts as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 5A and 5B, the lifting platform 12 of the watt-hour grounding device 10 includes a vertical portion 12a through which the vertical shaft 16 passes, and a front surface of the vertical portion 12a (see FIGS. 5A and 5B). ) And an engagement portion (hook) 13 that protrudes forward from the vertical frame 11 and engages with the engagement hole portion 6 of the watt hour meter 1, and horizontally from the upper end of the vertical portion 12 a to the back side. A horizontal portion 12b extending vertically, a pulley mounting portion 12d extending vertically from the upper end of the vertical portion 12a along the vertical frame 11, and a metal guide rail mounting portion 12e provided vertically at the rear end of the horizontal portion 12b. is doing.

  Further, at the upper end of the guide rail mounting portion 12e of the lifting platform 12, a conductive guide rail 20 inclined obliquely downward from the back side of the vertical frame 11 toward the front side with respect to a horizontal plane (a plane parallel to the horizontal portion 12b). Installed. The guide rail 20 is fixed on the horizontal portion 12b of the lifting platform 12 by the above-described guide rail mounting portion 12e and the support rod 26 that stabilizes the guide rail 20.

  The grounding rod 15 has an inclined surface 15a formed at the tip (front end), and the inclined surface 15a contacts the upper screw 5a of the case 2 to perform an insulation resistance test of the case 2. The grounding rod 15 is provided so as to be movable along the guide rail 20 from the back side to the front side of the vertical frame 11. That is, as will be described later, the grounding rod 15 is pulled forward by the linear member 23 when the elevator 12 is in the lower position (FIG. 5 (a)), protrudes from the front surface of the vertical frame 11, and protrudes from the upper screw of the case 2. 5a abuts. On the other hand, the grounding rod 15 is drawn to the back side of the vertical frame 11 when the lifting platform 12 is in the upper position (FIG. 5B).

  A swing member 21 that swings back and forth is provided at the rear end of the grounding rod 15. A spring 22 is interposed between the swinging member 21 at the rear end of the grounding rod 15 and the rear end 20a of the guide rail 20. The linear member 23 is made of, for example, a metal wire or the like. One end of the linear member 23 is connected to the rear end portion of the grounding rod 15 via the swing member 21 and the other end is connected to the vertical frame via the spring 27 and the fixing member 25. 11 is connected to the back surface.

  On the other hand, a pulley 24 is attached to the pulley attachment portion 12 d of the lifting platform 12, and a linear member 23 is stretched over the pulley 24.

Next, the operation of the present embodiment having such a configuration will be described.
First, in the state where the elevator 12 of the grounding device 10 for the watt hour meter is in the upper position (FIG. 5B), the engagement hole 6 of the watt hour meter 1 for performing the insulation resistance test is engaged with the vertical frame 11 The watt hour meter 1 is attached to the front surface of the vertical frame 11 by engaging with the portion (hook) 13. At this time, the watt hour meter 1 and the lifting platform 12 descend to the lower position (FIG. 5A) against the urging force of the spring 17 due to their own weight, and the current terminal 3a and the voltage terminal 3b of the watt hour meter 1 Comes into contact with the terminal 7 a of the connector 7.

  During this time, the guide rail 20 attached to the guide rail attaching portion 12e and the pulley 24 attached to the pulley attaching portion 12d are lowered in conjunction with the lowering of the lifting platform 12. At this time, as the guide rail 20 descends, the grounding rod 15 on the guide rail 20 is pulled downward. Further, as the pulley 24 descends, the linear member 23 is pulled forward, whereby the grounding rod 15 is pulled forward via the swing member 21. In this way, the grounding rod 15 moves toward the front surface of the vertical frame 11, protrudes from the front surface of the vertical frame 11, and contacts the upper screw 5 a of the case 2.

  Next, an insulation resistance test of the watt-hour meter 1 is performed. In this case, since the grounding rod 15 is in contact with the upper screw 5a of the case 2, the upper screw 5a of the case 2 is connected to the grounding rod 15, the guide rail 20, the guide rail mounting portion 12e of the lifting platform 12, and the horizontal portion 12b. And the ground side (ground side) through the ground wire 19.

  After the insulation resistance test of the watt hour meter 1 is completed, the engagement hole 6 of the watt hour meter 1 is removed from the engagement portion (hook) 13 of the vertical frame 11, and the watt hour meter 1 is removed from the front surface of the vertical frame 11. When the watt-hour meter 1 is removed, the lifting platform 12 is urged upward by the spring 17 and rises to the upper position (FIG. 5B).

  During this time, the guide rail 20 attached to the guide rail attachment portion 12e and the pulley 24 attached to the pulley attachment portion 12d rise in conjunction with the lifting platform 12 rising. At this time, as the guide rail 20 rises, the grounding rod 15 on the guide rail 20 is lifted upward. Further, as the pulley 24 moves up, the tension on the linear member 23 is released, and the ground rod 15 is pulled back toward the rear end portion 20a of the guide rail 20 by being biased by the spring 22. In this way, the grounding rod 15 moves toward the back surface of the vertical frame 11 and is pulled into the back surface of the vertical frame 11.

  Thus, according to the present embodiment, the grounding rod 15 protrudes from the front surface of the vertical frame 11 and comes into contact with the upper screw 5a of the case 2, so that the insulation resistance test of the watt-hour meter 1 is automatically and efficiently performed. be able to.

The side view which shows 1st Embodiment of the grounding apparatus for watt-hour meters by this invention (when a raising / lowering stand exists in a downward position). The side view which shows 1st Embodiment of the grounding apparatus for watt-hour meters by this invention (when a raising / lowering stand exists in an upper position). The front view which shows 1st Embodiment of the grounding apparatus for watt-hour meters by this invention. The perspective view from the back side which shows 1st Embodiment of the grounding device for watt-hour meters by this invention. The side view which shows 2nd Embodiment of the grounding apparatus for watt-hour meters by this invention. The front view which shows the insulation resistance test of the conventional watt-hour meter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electricity meter 2 Case 3a Current terminal 3b Voltage terminal 4 Transparent cover 5a Upper screw 5b Side screw 6 Engagement hole part 7 Wire connector 10 Grounding device for watt-hour meters 11 Vertical frame 12 Lifting stand 13 Engagement part (hook)
DESCRIPTION OF SYMBOLS 14 Telescopic cylinder 15 Grounding rod 15a Inclined surface 16 Vertical shaft 17 Spring 18 Guide means 19 Ground wire 20 Guide rail 21 Oscillating member 22 Spring 23 Linear member 24 Pulley

Claims (8)

In a watt-hour meter grounding device used when conducting an insulation resistance test of a watt-hour meter including a case and a current terminal and a voltage terminal provided at the bottom of the case,
A vertical frame,
A lifting platform that is provided on the back surface of the vertical frame so as to be movable up and down, and has an engaging portion that engages with the upper portion of the watt hour meter, and moves up and down so as to be integrated with the watt hour meter so as to take an upper position and a lower position. ,
A telescopic cylinder attached to the platform and extending from the back side of the vertical frame toward the front side;
A grounding rod attached to the tip of the telescopic cylinder, abutting against the case and performing an insulation resistance test of the case,
The grounding rod protrudes from the front surface of the vertical frame by the telescopic cylinder when the lifting platform is in the lower position, and is brought into contact with the case by the telescopic cylinder when the lifting platform is in the upper position. A grounding device for a watt-hour meter.   2. The grounding device for a watt hour meter according to claim 1, wherein the telescopic cylinder is attached to the lifting platform in a state of being inclined obliquely downward from the back side to the front side with respect to a horizontal plane. In a watt-hour meter grounding device used when conducting an insulation resistance test of a watt-hour meter including a case and a current terminal and a voltage terminal provided at the bottom of the case,
A vertical frame,
A lifting platform that is provided on the back surface of the vertical frame so as to be movable up and down, and has an engaging portion that engages with the upper portion of the watt hour meter, and moves up and down so as to be integrated with the watt hour meter so as to take an upper position and a lower position. ,
A guide rail attached to the platform,
A grounding rod that is movable along the guide rail from the back side of the vertical frame toward the front side, and that contacts the case and performs an insulation resistance test of the case;
A linear member having one end connected to the end of the grounding rod and the other end connected to the back surface of the vertical frame,
The grounding rod is pulled by a linear member when the lifting platform is in the lower position, protrudes from the front surface of the vertical frame and contacts the case, and is pulled into the rear surface of the vertical frame when the lifting platform is in the upper position. A grounding device for a watt-hour meter.   The watt-hour meter grounding device according to claim 3, wherein a pulley on which a linear member is stretched is attached to the lifting platform.   5. The grounding device for an electric energy meter according to claim 3, wherein a spring is interposed between a rear end portion of the grounding rod and a rear end portion of the guide rail. A vertical shaft is installed on the back of the vertical frame to guide the elevator.
When the watt hour meter is not attached, the lifting platform is urged to the upper position by a spring provided on the outer periphery of the vertical shaft, and when the watt hour meter is attached, the elevator base is lowered by the weight of the watt hour meter. The watt-hour meter grounding device according to claim 1, wherein the watt-hour meter grounding device is lowered.   The grounding device for a watt-hour meter according to any one of claims 1 to 6, wherein a ground wire is attached to the lifting platform.   The grounding device for a watt-hour meter according to any one of claims 1 to 7, wherein an inclined surface is formed at a tip of the grounding rod.

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