JP2016080687A - Bypass tool for watt-hour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bypass tool for a watt-hour meter, which is capable of preventing a screw from falling, and surely short-circuiting a terminal of a terminal block.SOLUTION: The bypass tool for a watt-hour meter comprises: a case 3 which consists of a pair of case halves 13, 15 made of an insulation material and houses bus bars 5, 7 with pairs of connection terminal parts 48, 49 and 58, 59 of the respective bus bars 5, 7 exposed; and a pair of screw clamping members 11 arranged between the case half 13 and the pairs of connection terminal parts 48, 49 and 58, 59 to prevent a pair of screws 9 from being detached. The screw clamping members 11 consisting of cylindrical bodies have one ends respectively fitted to case side through holes 19; the other ends in contact with the respective connection terminal parts without closing terminal part side through holes 48C, 49C, 58C, 59C; and projection parts 65 at respective inner peripheral sides thereof. On the inner peripheral surfaces of the projection parts 65, female screw parts 67 are formed through which respective non-screw parts 9C pass after male screw parts 9A of screws 9 are respectively screwed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bypass meter for a watt hour meter including a bus bar that short-circuits between terminals provided in a terminal block of the watt hour meter.

  The watt-hour meter needs to be replaced regularly for the purpose of guaranteeing and maintaining accuracy. This is a replacement work that accompanies the expiry of the validity period of the test, and is also called a test work. Since it is necessary to remove the electric wire connected to the watt-hour meter during the replacement work, a watt-hour bypass tool has been conventionally used to enable the replacement work to be performed without a power outage. . The watt-hour meter bypass tool short-circuits a pair of terminals consisting of a combination of a terminal connected to a power-side electric wire and a terminal connected to a load-side electric wire provided in the terminal block of the watt-hour meter. In order to replace the watt hour meter. In the conventional watt-hour meter, the electric wire is bypassed by using a watt-hour bypass tool, and the electric wire and the bypass tool are electrically connected (for example, JP 2010-217155 A [Patent Document 1]. ).

  Recently, so-called smart meters, which are watt-hour meters having a function of digitally processing metered power and a communication function of communicating digital signals, are becoming popular. A terminal portion of the terminal block of the smart meter is formed with a female screw portion as in the terminal block of the type shown in FIG. 3A attached to the present specification, and the watt hour meter is utilized using the female screw portion. Some bypass tools can be installed to short-circuit the terminals. Therefore, the installation work of the watt-hour meter bypass tool is facilitated as compared with the conventional watt-hour meter that needs to push the wire coating and connect.

JP 2010-217155 A

  Replacing the watt hour meter using the watt hour meter tool is performed without a power outage, so workers should be careful not to get an electric shock, such as using insulating gloves when tightening or loosening screws. It is necessary to work while paying. Also, the watt hour meter is often installed in a place where it is difficult to work, such as a high place on a wall. Therefore, when screwing the wattmeter bypass tool using the female screw part formed in the terminal part of the terminal block and when removing the tool, it is not necessary to perform detailed work and tighten and loosen the screw. It is required that work can be performed safely and easily. Furthermore, it is required to be excellent in durability to withstand repeated use.

  The object of the present invention is to prevent the falling of the screw when the wattmeter bypass tool is screwed to and removed from the terminal block by utilizing the female screw portion provided in the terminal portion of the wattmeter terminal block. Moreover, it is providing the bypass tool for watt-hour meters which can short-circuit between the terminals of a terminal block reliably by the operation | work which fixes the bypass tool for watt-hour meters.

  Another object of the present invention is to provide a watt-hour bypass tool that is excellent in durability and can be easily replaced.

  Still another object of the present invention is to provide an electricity meter bypass tool that is highly convenient during transportation.

  Still another object of the present invention is to provide a watt-hour bypass tool having a shape that is easy to grip and easy to tighten a screw.

  Still another object of the present invention is to provide a watt-hour bypass tool capable of preventing a hand held by an operator from receiving an electric shock.

  Still another object of the present invention is to provide a watt-hour bypass tool capable of handling a plurality of types of terminal blocks.

  The present invention provides an improved watt-hour meter bypass tool having a bus bar in which a pair of connection terminal portions are connected to a pair of terminals provided in a terminal block of the watt-hour meter by a pair of screws to short-circuit the pair of terminals. The target of. The bypass tool for a watt-hour meter according to the present invention is composed of a pair of case halves formed of an insulating material, and accommodates a bus bar in a state where a pair of connection terminal portions of the bus bar is exposed, and a pair of case halves And a pair of screwing members arranged between one half of the case and the pair of connection terminal portions so as not to face the terminal block, and for preventing the pair of screws from coming off.

  The screw has a male screw part screwed into a female screw part provided on a terminal of the terminal block at one end, a screw head at the other end, and a male screw part between the male screw part and the screw head. And has a non-threaded portion having a diameter equal to or less than the maximum outer diameter. A pair of connection terminal portions of the bus bar are formed with terminal-side through-holes through which the male screw portion of the screw passes, and a case-side through-hole through which the male screw portion of the screw passes is formed in one case half Has been. The screwing member has an annular shape in which one end is fitted into the case side through hole, the other end contacts the connection terminal portion so as not to block the terminal portion side through hole, and protrudes radially inward to the inner peripheral portion. And a cylindrical body formed with a female screw portion through which a non-screw portion passes after the male screw portion is screwed onto the inner peripheral surface of the projection portion.

  According to the watt-hour bypass tool of the present invention, the male screw portion of the screw fixing member that exceeds the female screw portion toward the connection terminal portion is screwed into the female screw portion of the screw fixing member while pulling the screw. In this state, the screw will not fall out of the screw fastening member unless the screw is rotated backward. Therefore, even in a situation where the operator is wearing insulating gloves, the screw does not fall off from the watt-hour bypass tool, so that the screw tightening operation is easy. Further, by screwing the screw into the female screw portion of the terminal of the terminal block, the connection terminal portion reliably contacts the terminal of the terminal block, so that the terminal of the terminal block can be reliably short-circuited. Furthermore, since it is not necessary to carry separately the main-body part and screw of the watt-hour meter bypass tool, the convenience during transportation is improved.

  Further, in the watt-hour bypass tool of the present invention, since the screwing member is a separate member from the case, an annular projecting portion is provided inside the cylindrical body provided in the screwing member, and the female screw portion is provided on the projecting portion. It can be easily formed. Even when the number of bus bars is different, the screwing member can be used as a general-purpose part, so that the price of the watt-hour bypass tool can be reduced. Further, even when the diameters of the female screw portions provided on the terminals of the terminal block are different, it can be dealt with by replacing the screwing members. Furthermore, if the screw is repeatedly tightened and the screw moves in the cylinder, and the female screw part of the screwing member is worn or chipped and needs to be replaced, disassemble the case and remove it from the case. The screwing member can be easily removed and replaced. The material of the cylindrical body constituting the screwing member is arbitrary, but in order to increase the durability against wear with the screw to be combined and to make the shape difficult to change due to temperature change, It is desirable that the cylindrical body to be formed is a member made of metal or ceramic.

  The number of bus bars is required in accordance with the number of terminal pairs of the terminal block to be short-circuited. For example, when there is one pair of terminals of the terminal block to be short-circuited, one bus bar may be provided. When there are two pairs of terminals of the terminal block to be short-circuited, it is sufficient that two bus bars are provided.

  Moreover, when some of the pairs of terminals that need to be short-circuited among a plurality of pairs of terminals provided in the terminal block of the watt-hour meter, it is only necessary to provide bus bars corresponding to the number. For example, when there are a plurality of pairs of terminals, the first pair of connection terminal portions are connected to the first pair of terminals among the plurality of pairs of terminals provided in the terminal block of the watt hour meter by the first pair of screws. The first bus bar that short-circuits the first pair of terminals, and the second pair of connection terminal portions are connected to the second pair of terminals among the plurality of pairs of terminals by the second pair of screws. A second bus bar that short-circuits the pair of two terminals may be provided. Thus, when the 1st and 2nd bus bar is provided in the bypass tool for watt-hour meters, the mounting of the two bus bars to the terminal block can be performed by one mounting operation.

  Although the structure which fits a cylinder to a case side through-hole is arbitrary, for example, the small diameter part fitted to a case side through hole is formed in the outer peripheral part of a cylinder, and this small diameter part is formed. A large-diameter portion having a diameter larger than the diameter of the case-side through-hole is provided adjacent to the end portion, and the end surface of the large-diameter portion on the small-diameter portion side can be in contact with one case half. If comprised in this way, a cylinder can be fixed only by inserting the small diameter part of a cylinder into a case side through-hole.

  A coil spring that is disposed between the screw head and the projecting portion of the cylinder in a state of passing through the non-threaded portion of the screw and that is energized when the screw is screwed into the terminal block may be further provided. Good. When the coil spring is provided in this way, in a state where the screw is screwed into the female screw portion of the terminal block, the stored force of the coil spring acts in the direction of separating the screw head from the case, Prevents screws from loosening. Further, in the state where the screw is not screwed into the female screw portion of the terminal block, the orientation of the screw shaft is maintained in the direction in which the cylinder extends, and the installation work of the watt-hour bypass tool is facilitated. In addition, when the coil spring is not attached to the terminal block, the portability is improved by extending the coil spring and drawing a part of the screw into the cylinder.

  In order to further improve the portability and protect the male screw portion of the screw, the male screw portion is not screwed into the female screw portion provided in the terminal of the terminal block, and the cylindrical body and What is necessary is just to make it have the length dimension accommodated in a terminal part side through-hole. In particular, when the coil spring is provided, the extension of the coil spring automatically pulls the male screw part into the space formed by the cylindrical body and the terminal part side through hole. It is effective.

  One case half may be formed with a partition wall surrounding the periphery of the screw head of the screw. If it does in this way, the creeping distance with an adjacent screw can be extended, and insulation can be improved.

  The tip shape of the screw is arbitrary. For example, if the tip portion is pointed (conical), it is easy to position the screw tip into the female screw portion when screwing into the female screw portion provided on the terminal of the terminal block.

  The bypass tool for watt-hour meter of the present invention is a screw that is used to press the case against the terminal block when tightening the screw to the opposite side wall portion opposite to the wall portion facing the terminal block of the case. A grip handle for the operator to grip with one hand may be provided at a position that does not hinder the tightening operation. If there is a grip handle at a position that does not hinder the screw tightening operation, the operator can press the watt-hour meter bypass tool against the terminal block while gripping the grip handle to perform the screw tightening operation. Therefore, workability is improved. The grip handle may be formed integrally with the opposite side wall part, or may be constituted by a member different from the opposite side wall part.

  The position of the grip handle may be any position that does not hinder the screw tightening operation.For example, when the pair of connection terminal portions of one or more bus bars are disposed along one side of the case, It is desirable that the grip handle is arranged so as to extend along another side opposite to one side of the case. If the grip handle is arranged at this position, the distance between the connection terminal portion and the screw where a high voltage appears during the work and the hand of the worker holding the grip handle can be increased. Accidents can be prevented.

  The shape of the grip handle is arbitrary. For example, it may be formed of an elongated grip portion and a pair of leg portions provided at both ends of the grip portion, and the leg portion and the grip portion may have a plate shape extending in a direction orthogonal to the opposite side wall portion of the case. If it is this shape, it is a shape which is easy to hold even if the operator wears insulating gloves.

  When the operator grips the grip handle so that the thumb of the worker is located on the other side of the grip handle, the thumb may reach a position beyond the outline of the case. In this case, depending on the shape of the terminal block, the thumb may touch the terminal of the terminal block or the electric wire connected to the terminal. For such a case, it is desirable to provide an insulating portion that extends beyond the region where the thumb is located.

  This insulating part may be formed integrally with the case. The insulating part may be an insulating plate attached on the opposite side wall part. If the insulating plate is provided with a slit-like through-hole through which the gripping handle passes, the insulating plate can be easily attached by passing the gripping handle through the through-hole.

  Note that when the insulating portion is formed of an insulating plate, the insulating plate can be prepared as a separate component from the case. Therefore, attach the insulation plate only when attaching the watt-hour meter bypass tool to the terminal block of the type where the operator's thumb may touch the terminal block terminal or the wire connected to the terminal, etc. It is possible to obtain a watt-hour bypass tool that can accommodate multiple types of terminal blocks, such as by removing the insulation plate when attaching a watt-hour bypass tool to a type of terminal block. is there.

  A plurality of electric wires are connected to the plurality of terminals of the terminal block through electric wire holes provided on the bottom surface. The screw (see Fig. 3 (A)) that secures the electric wire is housed in the terminal block so that it does not protrude from the surface of the terminal block. Depending on the diameter of the electric wire to be connected and the type of the terminal block May be fixed in a state where the screw for fixing the electric wire protrudes beyond the surface of the terminal block. In this case, if you attempt to work with the watt-hour meter bypass tool, the connecting terminal of the watt-hour meter bypass tool accidentally touches the screw that secures the wire, causing an unexpected short circuit. There is a possibility. Therefore, a guide wall for positioning the watt-hour bypass tool with respect to the terminal block can be provided. When the pair of connection terminal portions of one or more bus bars are arranged along one side of the case, the guide wall is located on both ends of one side of the case and extends in a direction intersecting with the one side. A pair may be provided. When the case is pressed against the terminal block, the pair of guide walls can be positioned in the direction in which one side of the case extends with respect to the terminal block so as to face the pair of side surfaces of the terminal block. The pair of guide walls prevents the connection terminal portion of the watt-hour meter bypass tool from accidentally touching the screw that fixes the electric wire.

  The pair of guide walls may be formed integrally with one case half, or may be formed of a guide wall constituting member that is a separate member fixed to the opposite side wall. When preparing another guide wall constituent member, one guide wall constituent member provided with a pair of guide walls may be prepared. Moreover, you may prepare a pair of division | segmentation guide wall structural member each fixed to a pair of side which the case opposes.

It is a disassembled perspective view of the bypass tool for watt-hour meters of this Embodiment. (A) is a plan view of the watt-hour bypass tool of the present embodiment, (B) is a front view, (C) is a bottom view, (D) is a rear view, and (E) is a right side. FIG. (A) is a perspective view which shows the 1st type terminal block which attaches the bypass tool for watt-hour meters and the bypass tool for watt-hour meters, and (B) is the 1st type of bypass tool for watt-hour meters. It is a perspective view which shows the state attached to the terminal block. (A) is an expanded sectional view which shows the state which pressed the bypass tool for wattmeters to the terminal block, (B) is an expanded sectional view which shows the state which screwed the bypass tool for wattmeters to the terminal block It is. It is a disassembled perspective view of the bypass tool for watt-hour meters of 2nd Embodiment. (A) is a perspective view which shows the 2nd type terminal block which attaches the bypass tool for watt-hour meters and the bypass tool for watt-hour meters, and (B) is the 2nd type of bypass tool for watt-hour meters. It is a perspective view which shows the state attached to the terminal block. It is a figure which shows the insulation plate used for the bypass tool for watt-hour meters of 3rd Embodiment. It is a perspective view which shows the state which attached the bypass tool for watt-hour meters of 3rd Embodiment to the 2nd type terminal block. It is a figure which shows the bypass tool for watt-hour meters of 4th Embodiment, (A) is a perspective view which shows the 1st type terminal block which attaches the bypass tool for watt-hour meters and the bypass tool for watt-hour meters. (B) is a perspective view showing a state in which the watt-hour meter bypass tool is attached to the first type terminal block. It is a figure which shows the bypass tool for watt-hour meters of 5th Embodiment, (A) is a perspective view which shows the 1st type terminal block which attaches the bypass tool for watt-hour meters and the bypass tool for watt-hour meters. (B) is a perspective view showing a state in which the watt-hour meter bypass tool is attached to the first type terminal block. It is a figure which shows the bypass tool for watt-hour meters of 6th Embodiment, (A) is a perspective view which shows the 1st type terminal block which attaches the bypass tool for watt-hour meters and the bypass tool for watt-hour meters. (B) is a perspective view showing a state in which the watt-hour meter bypass tool is attached to the first type terminal block.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a watt-hour bypass tool of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of the watt-hour bypass tool of the present embodiment, FIG. 2A is a plan view of the watt-hour bypass tool of the present embodiment, and FIG. (C) is a bottom view, (D) is a rear view, and (E) is a right side view. Since the left side view appears symmetrically with the right side view, the illustration is omitted.

  First, in the present specification, as shown in FIG. 1, a plurality of directions are defined with respect to the watt-hour meter bypass tool 1. That is, the left-right direction (first direction D1) composed of the right direction Ri and the left direction Le, the front-rear direction (second direction D2) composed of the forward direction Fo and the rear direction Re, the up-down direction composed of the upward direction Up and the downward direction Lo. The direction (third direction D3) is defined as shown in FIG. In the description of the structure shown in FIG. 3, the same direction as that used in the description of FIG. 1 is used.

[Configuration of each part]
The watt-hour meter bypass tool 1 shown in FIG. 1 and FIGS. 2A to 2E is an watt-hour meter used for a terminal block used in a three-wire type 120A smart meter (watt-hour meter). Bypass tool. As shown in the exploded perspective view of FIG. 1, the wattmeter bypass tool 1 of the present embodiment mainly includes a case 3, two bus bars 5, 7 housed in the case 3, and four The screw 9 and four screwing members 11 constituted by a cylindrical body corresponding to the screw 9 are configured.

<Case>
The case 3 has a rectangular shape in which the long side extends in the first direction D1 and the short side extends in the third direction D3, and the pair of case halves 13 and 15 are combined. The pair of case halves 13 and 15 are formed of an insulating material such as an insulating resin. One case half 15 is a side facing a terminal block, which will be described later, and the other case half 13 is a case half located on the opposite side and not facing the terminal block. Near the long side 17 on the upper side of the case half 13, four case-side through holes 19 are formed along the long side 17 to which the screwing member 11 is fitted. A partition wall portion 19A surrounding the screw head portion 9B of the screw 9 is formed on the front side of the case half 13 of the case side through hole 19, and a screwing member support portion for supporting the screwing member 11 on the back surface side. 19B is formed. In addition, a positioning bulging portion 20 is also formed in the vicinity of the long side 17 along with the case side through hole 19. In the present embodiment, as will be described later, since 2S (power supply side) and 2L (load side) are electrically connected inside the terminal block, no bus bar is provided for this purpose. Instead of the connecting portion, the positioning bulging portion 20 is located at a position corresponding to the position of the terminal to which the 2S (power supply side) wire of the terminal block is connected when the watt-hour bypass tool 1 is attached to the terminal block. Is formed. In this embodiment, the bulging portion is not formed at a position corresponding to the position of the terminal to which the 2L (load side) electric wire of the terminal block is connected, but it may be formed as a matter of course. is there.

  A gripping handle 23 extending along the front side of the case half 13 of the long side 21 is provided in the vicinity of the long side 21 positioned in the downward direction Lo facing the long side 17. The grip handle 23 includes an elongated grip portion 25 and a pair of leg portions 27 provided at both ends of the grip portion 25, and is formed integrally with the case half 13. The grip portion 25 and the leg portion 27 have a plate shape extending in a direction orthogonal to the wall portion of the case half 13.

  In the vicinity of the pair of short sides 29, 29 of the case half 13, engaging portions 31, 31 extending along the short side 29 and projecting toward the case half 15 are formed. The engaging portions 31, 31 form a snap fit structure with the engaged portions 33, 33 formed in the case half 15, and the engaging portions 31, 31 are fitted to the engaged portions 33, 33. Thus, the case half 13 and the case half 15 are engaged with each other to form the case 3.

  On the front surface of the case half 13, an electric wire display 37 indicating the correspondence between the screw and the corresponding terminal of the terminal block is written.

  Busbar storage recesses 39 and 41 in which the busbars 5 and 7 are stored are formed in the inner wall portion of the case half 15 facing the case half 13. The bus bar storage recesses 39 and 41 are open toward the case half 13. The bus bar storage recess 39 includes a peripheral wall portion 40A formed along three sides excluding the long side 45 of the case half portion 15, a central peripheral wall portion 40B formed inside the peripheral wall portion 40A, and an inner wall of the case half portion 15 It is U-shaped in a front view formed by being surrounded by parts. The bus bar storage recess 41 has a rectangular shape in a front view formed by being surrounded by the central peripheral wall portion 40 </ b> B and the inner wall portion of the case half 15. The bus bar storage recess 39 is formed with two locking pieces 43, 43 projecting in the second direction D 2 from the central peripheral wall portion 40 B into the bus bar storage recess 39. A part of the bus bar storage recess 39 is narrowed by the locking pieces 43, 43, and the bus bar 5 stored in the bus bar storage recess 39 is prevented from moving in the left-right direction. The bus bar storage recess 39 is formed with openings 47, 47 that open upward at locations along the upper long side 45 of the case half 15, so that the bus bar 5 is stored in the bus bar 5. A pair of connection terminal portions 48 and 49 provided at the end of 5 are exposed to the outside of the case 3.

  The bus bar storage recess 41 includes locking pieces 51 and 51 protruding in the second direction D2 from the central peripheral wall 40B into the bus bar storage recess 41, and locking pieces 53 and 53 protruding in the third direction D3. Further, a T-shaped locking piece 55 is also formed at the center of the busbar housing recess 41. By storing the bus bar 7 along the locking pieces 51, 51, 53, 53 and the T-shaped locking piece 55, the bus bar 7 stored in the bus bar storage recessed portion 41 is difficult to move. The bus bar storage recess 41 is also formed with openings 57, 57 that open upward at positions along the long side 45, and is provided at the end of the bus bar 7 in a state in which the bus bar 7 is stored. The pair of connecting terminal portions 58 and 59 are exposed to the outside of the case 3.

  In the vicinity of the pair of short sides 46, 46 of the case half 15, penetrating groove-like engaged portions 33, 33 extending along the short side 46 are formed.

<Busba>
The bus bars 5 and 7 are formed by punching a metal plate into a predetermined shape, and a pair of connection terminal portions 48 and 49 and 58 and 59 are formed at the ends. The bus bar 5 is U-shaped when viewed from the front, and short-circuits a pair of terminals to which 1S (power supply side) and 1L (load side) wires located on the outermost side of the terminal block are connected. The bus bar 7 short-circuits a pair of terminals to which 3S (power supply side) and 3L (load side) wires located on the innermost side of the terminal block are connected, and a central peripheral wall forming the bus bar housing recess 41 It has a shape along the portion 40B. In this embodiment, since 2S (power supply side) and 2L (load side) are electrically connected inside the terminal block, bus bars for 2S (power supply side) and 2L (load side) are provided. Not.

  The pair of connection terminal portions 48 and 49 are formed stepwise by bending the end portion of the bus bar 5, the terminal contact portions 48 </ b> A and 49 </ b> A extending in parallel with the plate surface of the bus bar 5, and the plate surface of the bus bar 5. And orthogonal portions 48B and 49B orthogonal to the terminal contact portions 48A and 49A. Similarly, the pair of connection terminal portions 58 and 59 are formed in a staircase shape by bending the end portion of the bus bar 7, and the terminal contact portions 58 </ b> A and 59 </ b> A extending in parallel with the plate surface of the bus bar 7 and the bus bar 7. And orthogonal portions 58B and 59B perpendicular to the terminal contact portions 58A and 59A. The terminal contact parts 48A and 49A are formed with terminal part side through holes 48C and 49C, and the terminal contact parts 58A and 59A are formed with terminal part side through holes 58C and 59C.

<Screw>
As shown in FIG. 1, the screw 9 has a male screw portion 9A at one end, a screw head 9B at the other end, and the maximum of the male screw portion 9A between the male screw portion 9A and the screw head 9B. A non-threaded portion 9C having a diameter equal to or smaller than the outer diameter is provided. The tip is pointed. When fixing the screw 9 to the screwing member 11, the washer 61 and the coil spring 63 are sequentially passed from the tip end side of the screw 9, and the washer 61 and the coil spring 63 are attached to the non-screw portion 9 </ b> C. It has become.

<Screw member>
The screwing member 11 is composed of a metal cylinder having a through hole in the second direction D2, and a small diameter portion 11A fitted in the case side through hole 19 and a small diameter portion on the outer peripheral portion. A large-diameter portion 11B having a diameter dimension larger than that of the case side through hole 19 is provided adjacent to 11A. By inserting the small diameter portion 11A into the case side through hole 19 from the back side of the case half portion 13, the end surface of the large diameter portion 11B comes into contact with the periphery of the case side through hole 19, and the screwing member 11 is connected to the case half portion 13. It is fixed against. An annular projecting portion 65 projecting radially inward is provided on the inner peripheral portion of the screwing member 11. On the inner peripheral surface of the protruding portion 65, a female screw portion 67 into which the male screw portion 9A of the screw 9 is screwed is formed (see FIG. 4 described later). In the present embodiment, the screwing member 11 is made of metal in consideration of durability and heat resistance, but other materials such as ceramic may be used.

[assembly]
As shown in FIG. 1, the watt-hour meter bypass tool 1 is assembled as follows.
(1) The screwing member 11 is attached to the case side through hole 19 of the case half 13 from the back side of the case half 13. The screwing member 11 is inserted into the case side through hole 19 until the end surface of the large diameter portion 11B contacts the periphery of the case side through hole 19.
(2) The bus bars 5 and 7 are arranged so that the centers of the terminal portion through holes 48C and 49C and 58C and 59C are aligned with the center of the screwing member 11.
(3) After (1) and (2), the engaging portions 31 and 31 are engaged with the engaged portions 33 and 33, and the case half portion 15 is fitted to the case half portion 13. As a result, the bus bars 5 and 7 are held between the pair of case halves 13 and 15, and the bus members 5 and 7 are prevented from being blocked by the screwing member 11 of the terminal-side through holes 48C, 49C, 58C and 59C. It contacts the terminal contact portions 48A, 49A, 58A, 59A of the connection terminal portions 5 and 7.
(4) After (3), the screw 9 in a state where the washer 61 and the coil spring 63 are passed through the non-threaded portion 9C is attached to the screwing member 11 from the front side of the case half 13. When the screw 9 is attached, the male screw portion 9A is screwed so as to exceed the female screw portion 67 formed in the protruding portion 65 until the non-threaded portion 9C penetrates the protruding portion 65 in the screwing member 11. . As a result, while pulling the screw 9, the screw 9 comes off from the screwing member 11 unless the screw 9 is rotated in the reverse direction in a state where the male screw portion 9 </ b> A of the screw 9 is screwed into the female screw portion 67 of the screwing member 11. There is no.

[Attachment to terminal block]
FIG. 3A is a perspective view showing a first type of terminal block to which the watt-hour bypass tool and the watt-hour bypass tool are attached, and FIG. 3B is a first view of the watt-hour bypass tool. It is a perspective view which shows the state attached to the terminal block of this type. Instruments and wires are connected to the terminal block 69, but are not shown in FIG. 3.

  The terminal block 69 is a terminal block of a 3-wire 120A smart meter. The terminal block 69 includes a plurality of metal terminals that are electrically connected to each other in an insulating terminal block main body 71. The terminals of the terminal block 69 are a pair of terminals 73A, 73B, 2S (power supply side) and 2L (load side) connected to the outermost 1S (power supply side) and 1L (load side) electric wires. There are a total of six terminals: a pair of connected terminals 75A and 75B, and a pair of terminals 77A and 77B to which the innermost 3S (power supply side) and 3L (load side) wires are connected. Each electric wire (not shown) is connected to each terminal through an electric wire hole (not shown) provided on the bottom surface of the terminal block main body 71.

  As shown in FIG. 3 (A), openings 79A, 79B, 81A, 81B, in which a part of the terminals 73A, 73B, 75A, 75B, 77A, 77B are exposed on the lower front surface of the terminal block 69, respectively. 83A and 83B are formed. Each terminal is formed with female screw portions 74A, 74B, 76A, 76B, 78A, 78B at the positions of the openings. The watt-hour bypass tool 1 is fixed to the terminal block 69 using the female screw portion.

  As shown in FIG. 3A, when attaching the watt-hour meter bypass tool 1 to the terminal block 69, referring to the electric wire display 37, first, the terminal contact portions 48A, 49A are opened to the openings 79A, 79B. A watt-hour meter is placed in front of the terminal block 69 so that the terminal contact portions 58A and 59A face the openings 83A and 83B, and the positioning bulge 20 faces the opening 81A. Hold the bypass tool 1. At this time, the operator can easily perform the operation by holding the grip handle 23 with one hand, and the grip handle 23 is provided at a position away from the screw 9, so It is possible for the person's hand to move away from the part where the voltage appears and to work safely. Next, as shown in FIG. 3B, the watt-hour meter bypass tool 1 is pressed against the terminal block 69, and the respective screws 9 are screwed into the female screw portions 74A, 74B, 78A, 78B of the terminals. By this operation, the terminal contact portion 48A and the terminal 73A are in contact with each other, the terminal contact portion 49A and the terminal 73B are in contact with each other, and the power source side and the load side are short-circuited by the bus bar 5. Similarly, the terminal contact portion 58A and the terminal 77A are in contact with each other, the terminal contact portion 59A and the terminal 77B are in contact with each other, and the power source side and the load side are short-circuited by the bus bar 7. During this short-circuit condition, the meter is replaced.

  FIG. 4 is a diagram showing details of a structure for preventing the screw 9 from slipping out (engagement structure of the screw 9 and the screwing member 11) of the watt-hour bypass tool 1 of the present embodiment. 4A is a cross-sectional view showing a state where the watt-hour bypass tool is pressed against the terminal block, and FIG. 4B is a cross-sectional view showing a state where the watt-hour bypass tool is screwed to the terminal block. It is. Since the basic structure is common to all parts, here, the terminal 73A and the connection terminal portion 48 attached to the terminal 73A are shown as an example.

  As shown in detail in FIG. 4 (A), the screwing member 11 is configured such that the end surface of the large-diameter portion 11B is inserted by inserting the small-diameter portion 11A into the case-side through hole 19 provided in the case half 13. The screwing member 11 is fixed to the case half 13 in contact with the periphery of the case side through hole 19. The bus bar 5 is sandwiched and fixed by the case half 13 and the case half 15 so that the screwing member 11 and the terminal contact portion 48A of the connection terminal portion of the bus bar 5 are in contact with each other. The screwing member 11 is in contact with the terminal contact part 48A so as not to block the terminal part side through hole 48C, and the screwing member 11 that is a cylinder and the terminal part side through hole 48C communicate with each other. The screw 9 penetrates. Because of this configuration, the screwing member 11 is securely fixed to the case 3, but when replacement is required, the case 3 is disassembled into a case half 13 and a case half 15. (And by removing the screw 9 if necessary), it can be easily removed.

  The screw 9 is passed through so that the non-threaded portion 9 </ b> C penetrates the female threaded portion 67 of the protruding portion 65 of the screwing member 11. In a state where the male screw portion 9A of the screw 9 has passed through the female screw portion 67 formed on the protruding portion 65, the male screw portion 9A engages with the end portion of the protruding portion 65, so that the screw 9 does not fall off from the screwing member 11. It has become. In addition, when the screw 9 is not screwed into the female screw portion 74A of the terminal block 69, the force of the coil spring 63 that comes into contact with the screw head 9B (including the washer 61) and the end of the protruding portion 65 and is applied in the pulling direction. As a result of this, the male screw portion 9A is drawn into the space S formed by the screwing member 11 and the terminal portion side through hole 48C, and the direction of the axis of the screw 9 in the direction in which the cylindrical body (screwing member 11) extends. Is maintained and the installation work of the electricity meter bypass tool 1 is facilitated. In the present embodiment, the length L1 of the male screw portion 9A is set to be shorter than the length L2 from the end of the protruding portion 65 of the screwing member 11 to the terminal portion side through hole 48C. Therefore, the male screw portion 9A is completely accommodated in the space S. Therefore, the portability of the electricity meter bypass tool 1 is improved, and the male screw portion 9 is protected.

  FIG. 4B shows a state in which the screw 9 is screwed into the female screw portion 74A of the terminal 73A. When the screw 9 is pushed toward the terminal 73A using a driver (not shown), the male screw portion 9A is pushed out of the space S, and the male screw portion 9A and the female screw portion 74A are screwed together by rotating the screw 9 in this state. . Since the tip of the screw 9 is pointed, positioning for inserting the screw 9 into the female screw portion 74A is easy. In the process of rotating the screw 9 and screwing the screw 9 until the screw head 9B (including the washer 61) contacts the end surface of the small diameter portion 11A of the screwing member 11, the coil spring 63 is stored. As a result, the stored force of the coil spring 63 acts in the direction of separating the screw head 9B from the case 3 to prevent the screw 9 from loosening. When the structure in which the screw head 9B (including the washer 61) is in contact with the end surface of the small diameter portion 11A of the screwing member 11 is employed, the case 3 is not damaged. When the end face of the small diameter portion 11A of the screwing member 11 or the female screw portion 67 formed on the protruding portion 65 is worn, the screwing member 11 may be replaced, and the tool life can be extended.

[Second Embodiment]
FIG. 5 is an exploded perspective view of the watt-hour bypass tool of the second embodiment, and FIG. 6A is a second type in which the watt-hour bypass tool and the watt-hour bypass tool are attached. It is a perspective view which shows this terminal block, (B) is a perspective view which shows the state which attached the bypass tool for watt-hour meters to the 2nd type terminal block. In FIGS. 5 and 6, the same members as those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals as those in FIGS. 1 to 4 plus 100. Description is omitted.

  The watt-hour bypass tool 101 of the second embodiment is a watt-hour bypass tool corresponding to the second type terminal block 169 shown in FIG. The second type terminal block 169 is a terminal block of the same 3-wire type 120A smart meter (watt-hour meter) as in the first embodiment, but the shape and configuration are different, and the terminals 173A and 173B are different. 177A, 177B, and openings 179A, 179B, 183A, 183B and an opening 181A from which a part of the terminals are exposed are provided above the terminal block 169, and an electric wire (not shown) is provided therebelow. The wire connection part 185 that is connected in an exposed state is greatly different from the first embodiment. The electric wire connected to the second type terminal block is connected to the electric wire connecting portion 185 of the terminal block by crimping a crimp terminal at the tip.

  When trying to attach the watt-hour meter bypass tool 1 of the first embodiment to the second type terminal block 169, the operator touches the electric wire connecting portion 185 or the electric wire, resulting in an electric shock accident. There is a possibility. That is, when the worker holds the grip handle 23 so that the thumb of the worker is positioned on the long side 21 side of the grip handle 23, the thumb may reach a position beyond the outline of the case 3. . In this case, there is a possibility that the thumb touches the wire connecting portion 185 or the wire of the terminal block 169. For such a case, the watt-hour bypass tool 101 of the second embodiment is provided with an insulating portion 187 that extends beyond the region where the thumb is located.

  The insulating part 187 is an extended part of the case half 113 provided so as to extend downward from the long side 121 of the case half 113, and the insulating part 187 and the case half 113 are integrally formed. . By providing the insulating portion 187, as shown in FIG. 6B, the insulating portion 187 covers the portion of the electric wire connecting portion 185 during the attaching operation, and the operator's thumb touches the electric wire connecting portion 185 and the electric wire. There is no possibility of it.

[Third Embodiment]
FIG. 7 is a view showing an insulating plate used for the watt-hour bypass tool of the third embodiment, and FIG. 8 shows a second type of the watt-hour bypass tool of the third embodiment. It is a perspective view which shows the state attached to the terminal block. 7 and 8, the same members as those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals as those in FIGS. 1 to 4 plus 200. Description is omitted.

  The watt-hour bypass tool 201 of the third embodiment is similar to the watt-hour bypass tool 101 of the second embodiment, and is a watt-hour bypass tool corresponding to the terminal block 269 of the second type. It is. The electricity meter bypass tool 201 of the third embodiment is the same as the electricity meter bypass tool 1 of the first embodiment, but corresponds to the second type terminal block 269, An insulating plate 289 that is attached to a gripping handle 223 that constitutes an insulating portion is provided.

  The insulating plate 289 is made of an insulating sheet material cut into a rectangular shape. In the vicinity of one long side 289A of the insulating plate 289, a slit-shaped through hole 291 is provided along the long side 289A. The through hole 291 has a shape that matches the shape of the grip handle 223, and the other long side 289 </ b> B of the insulating plate 289 is positioned away from the watt-hour bypass tool 201 as shown in FIG. 8. As described above, the insulating plate 289 is attached to the watt-hour bypass tool 201 through the through hole 291 in the gripping handle 223. As a result, as in the second embodiment, an insulating portion extending beyond the region where the worker's thumb is located can be configured. Therefore, as in the third embodiment, if the insulating plate 289 is provided and attached to the watt-hour meter bypass tool 201 using the grip handle 223, the power amount of the first embodiment is used. Without changing the design of the meter bypass tool 1, it is possible to obtain a watt-hour bypass tool that can handle a plurality of types of terminal blocks of the first type and the second type.

[Fourth Embodiment]
FIG. 9 is a diagram showing a watt-hour bypass tool according to the fourth embodiment. FIG. 9A is a first-type terminal block for attaching the watt-hour bypass tool and the watt-hour bypass tool. (B) is a perspective view which shows the state which attached the bypass tool for watt-hour meters to the 1st type terminal block. In FIG. 9, the same members as those in the embodiment shown in FIG. 3 are denoted by the same reference numerals as those in FIG.

  As shown in FIG. 9A, the watt-hour meter bypass tool 301 of the fourth embodiment includes a pair of guide walls 393A extending in the rearward direction Re from the pair of short sides 318A and 318B of the case half 313. 393B is provided integrally. The dimension of the case 303 in the first direction D1 is substantially the same as the dimension of the terminal block 369 in the first direction D1, and a pair of guide walls 393A and 393B are disposed on the outside thereof. Therefore, when the watt-hour bypass tool 301 is aligned and pressed so that the right and left direction with respect to the terminal block 369 is appropriate, the pair of guide walls 393A and 393B move along both side surfaces of the terminal block 369, and the terminal The block 369 is sandwiched, and the watt-hour bypass tool 301 can be attached to an appropriate position of the terminal block 369.

  On the other hand, when the watt-hour bypass tool 301 is pressed against the terminal block 369 in a state where the position in the left-right direction with respect to the terminal block 369 is shifted, one of the pair of guide walls 393A and 393B comes into contact with the terminal block 369. End up. Therefore, the connection terminal portions 348, 349, 358, 359 (particularly the terminal contact portions 348 A, 349 A, 358 A, 359 A) of the watt-hour bypass tool 301 do not contact the terminal block 369, and the connection terminal portions 348, 349. , 358, 359 will not accidentally touch the screw N that fixes the electric wire.

[Fifth Embodiment]
FIG. 10 is a diagram illustrating a watt-hour meter bypass tool according to a fifth embodiment, and FIG. 10A is a first-type terminal block to which a watt-hour meter bypass tool and a watt-hour meter bypass tool are attached. (B) is a perspective view which shows the state which attached the bypass tool for watt-hour meters to the 1st type terminal block. In FIG. 10, the same members as those of the embodiment shown in FIG. 9 are denoted by the same reference numerals as those in FIG.

  A watt-hour meter bypass tool 401 according to the fifth embodiment includes one guide wall constituting member 490 fixed to the case half 413. The guide wall constituting member 490 includes a fixing portion 492 extending along the case half 413 and a pair of guide walls 493A and 493B. The fixing portion 492 has through holes 494 and 494 formed therein. . The guide wall constituting member 490 is fixed to the case half 413 using fixing brackets 495 and 495 passed through the through holes 494 and 494.

[Sixth Embodiment]
FIG. 11: is a figure which shows the bypass tool for watt-hour meters of 6th Embodiment, (A) is a 1st type terminal block which attaches the bypass tool for watt-hour meters and the bypass tool for watt-hour meters (B) is a perspective view which shows the state which attached the bypass tool for watt-hour meters to the 1st type terminal block. In FIG. 11, the same members as those of the embodiment shown in FIG. 10 are denoted by the same reference numerals as those in FIG.

  The watt-hour bypass tool 501 of the sixth embodiment includes a pair of divided guide wall constituting members 590A and 590B fixed to the case half 513. The divided guide wall constituting member 590A includes a fixed portion 592A and a guide wall 593A. The fixed portion 592A has two sets of through-holes 594, 594 and 594 ′ arranged in a pair in the vertical direction. 594 'are formed. The divided guide wall constituting member 590B includes a fixed portion 592B and a guide wall 593B. The fixed portion 592B includes two sets of through-holes 594, 594 arranged in a vertical direction. 594 'and 594' are formed. The pair of divided guide wall constituting members 590A and 590B are fixed to the case half 513 using a fixing bracket 595 that is passed through a set of through holes 594. In the present embodiment, the divided guide wall constituting members 590A and 590B are fixed using a set of through holes 594. However, a set of through holes 594 ′ is used according to the horizontal dimension of the terminal block to be attached. Thus, the advantage of this embodiment is that the divided guide wall constituting members 590A and 590B can be fixed.

  The above embodiment has been described as an example, and is not limited to the present embodiment unless departing from the gist thereof. For example, the terminal block to which the watt-hour bypass tool according to the present invention can be attached is not limited to the terminal block of the type shown in the above example, but a 2-wire 30A smart meter terminal block, 3-wire It is possible to change the configuration so that it can be attached to a terminal block of a smart meter for 60A of the formula. In the case of a terminal block of a 2-wire type 30A smart meter, there are one or two bus bars. Also in this case, an insulating part can be provided in accordance with the shape of the terminal block. In addition, the grip handle is formed integrally with the case. However, for example, the grip handle may be formed of a member different from the case and attached to the half of the case by screwing or fitting. In this way, the case can be easily molded. In addition, if the fixing structure is fixed through the bus bar housed in the case when mounting, the grip handle can be fixed more firmly using the bus bar.

  According to the present invention, the female screw portion provided in the terminal portion of the terminal block of the watt hour meter is used to prevent the screw from dropping when the watt hour meter bypass tool is screwed to and removed from the terminal block. Moreover, the bypass tool for watt-hour meters which can short-circuit the terminal of a terminal block reliably by the operation | work which fixes the bypass tool for watt-hour meters can be obtained. Moreover, according to this invention, the bypass tool for watt-hour meters which is excellent in durability and can replace components easily can be obtained. Furthermore, according to this invention, the bypass tool for watt-hour meters with the high convenience at the time of conveyance can be obtained. In addition, it is possible to obtain a watt-hour meter bypass tool having a shape that is easy to grip and easy to tighten a screw. Moreover, the bypass tool for watt-hours which can prevent the electric hand's hand holding an electric shock can be obtained. Furthermore, a watt-hour bypass tool that can handle a plurality of types of terminal blocks can be obtained.

DESCRIPTION OF SYMBOLS 1 Bypass tool for electricity meters 3 Case 5, 7 Bus bar 9 Screw 9A Male screw part 9B Screw head 9C Non-screw part 11 Screw fixing member (cylinder)
11A Small-diameter portion 11B Large-diameter portion 13, 15 Case half-portion 17, 21 Long side 19 (case half-portion 13) Case-side through hole 19A Bulkhead portion 19B Screwing member support portion 20 Positioning bulge portion 23 Grip part 27 Leg part 29 Short side 31 (Case half part 13) Engagement part 33 Engaged part 37 Electric wire display 39, 41 Busbar storage concave part 43 Locking piece 45 (Long side part of case 15) 47 Opening part 48, 49 Connection terminal part 48A, 49A Terminal contact part 48B, 49B Orthogonal part 48C, 49C Terminal part side through hole 51, 53 Locking piece 55 T-shaped locking piece 57 Opening part 58, 59 Connection terminal part 58A, 59A Terminal Contact part 58B, 59B Orthogonal part 58C, 59C Terminal part side through hole 61 Washer 63 Coil spring 65 Projection part 67 Female thread part 69 Terminal block 71 Terminal block main body 73 , 73B, 75A, 75B, 77A, 77B a pair of terminals 79A, 79B, 81A, 81B, 83A, 83B opening

Claims (16)

A bypass meter for a watt hour meter comprising a bus bar in which a pair of connection terminal portions are connected to a pair of terminals provided in a terminal block of the watt hour meter by a pair of screws to short-circuit the pair of terminals,
A case configured to include a pair of case halves formed of an insulating material and storing the bus bar in a state where the pair of connection terminal portions of the bus bar are exposed;
A pair of the pair of case halves disposed between the one case half and the pair of connection terminal portions so as not to face the terminal block, and for preventing the pair of screws from coming off. It is made up of
The screw has a male screw portion screwed into a female screw portion provided in the terminal of the terminal block at one end, a screw head at the other end, and the male screw portion and the screw head. A non-threaded portion having a diameter equal to or smaller than the maximum outer diameter of the male threaded portion,
Each of the pair of connection terminal portions of the bus bar is formed with a terminal portion side through hole through which the male screw portion of the screw passes,
The one case half is formed with a case side through-hole through which the male screw portion of the screw passes,
One end of the screwing member is fitted into the case side through hole, the other end abuts the connection terminal portion so as not to block the terminal portion side through hole, and protrudes radially inward to the inner peripheral portion. And a cylindrical body formed with a female thread portion through which the non-threaded portion passes after the male threaded portion is screwed onto the inner peripheral surface of the projecting portion. Bypass tool for quantity meter. A first pair of connection terminal portions are connected to a first pair of terminals among a plurality of pairs of terminals provided in a terminal block of the watt hour meter by a first pair of screws, and the first pair of terminals is connected to the first pair of terminals. The first bus bar to be short-circuited, and the second pair of connection terminal portions are connected to the second pair of terminals among the plurality of pairs of terminals by the second pair of screws, thereby short-circuiting the second pair of terminals. A wattmeter bypass tool comprising a second bus bar,
A pair of case halves formed of an insulating material, with the first pair of connection terminal portions of the first bus bar and the second pair of connection terminal portions of the second bus bar exposed. A case for storing the first bus bar and the second bus bar;
One of the pair of case halves arranged so as not to face the terminal block, the first pair of connection terminal portions of the first bus bar, and the second of the second bus bars. A first pair of screwing members and a second pair of screws which are arranged between two pair of connection terminal portions and prevent the first pair of screws and the second pair of screws from coming off. A stop member,
The screw has a male screw portion screwed into a female screw portion provided in the terminal of the terminal block at one end, a screw head at the other end, and the male screw portion and the screw head. A non-threaded portion having a diameter equal to or smaller than the maximum outer diameter of the male threaded portion,
The first pair of connection terminal portions of the first bus bar and the second pair of connection terminal portions of the second bus bar have terminal portion side through holes through which the male screw portions of the screws pass, respectively. Formed,
The one case half is formed with a case side through-hole through which the male screw portion of the screw passes,
One end of the screwing member is fitted into the case side through hole, the other end abuts the connection terminal portion so as not to block the terminal portion side through hole, and protrudes radially inward to the inner peripheral portion. And a cylindrical body formed with a female thread portion through which the non-threaded portion passes after the male threaded portion is screwed onto the inner peripheral surface of the projecting portion. Bypass tool for quantity meter.   A small-diameter portion that fits into the case-side through hole is formed on the one end side of the outer peripheral portion of the cylindrical body, and the diameter dimension is larger than the diameter of the case-side through hole adjacent to the small-diameter portion. The wattmeter bypass tool according to claim 1, further comprising a large-diameter portion, wherein an end surface of the large-diameter portion on the small-diameter portion side is in contact with the one case half. A coil spring disposed between the screw head and the protruding portion of the cylindrical body in a state of passing through the non-threaded portion of the screw;
The bypass tool for a watt-hour meter according to claim 1 or 2, wherein the coil spring is stored when the screw is screwed into the terminal block.   The male screw portion of the screw has a length stored in the cylindrical body and the terminal portion side through hole in a state where the screw is not screwed into the female screw portion provided in the terminal of the terminal block. The bypass tool for watt-hour meters according to any one of claims 1 to 4, which has dimensions.   The bypass tool for a watt-hour meter according to any one of claims 1 to 5, wherein a partition wall that surrounds the periphery of the screw head of the screw is formed in the one case half.   The bypass screw for a watt-hour meter according to any one of claims 1 to 6, wherein the screw has a pointed tip.   When the case is pressed against the terminal block when the screw is tightened, the screw is tightened on the opposite side wall located on the opposite side of the case from the wall facing the terminal block. The bypass tool for a watt-hour meter according to claim 1 or 2, wherein a grip handle for an operator to grip with one hand is provided at a position that does not obstruct. The pair of connection terminal portions of the one or more bus bars are arranged along one side of the case,
The bypass tool for a watt-hour meter according to claim 8, wherein the grip handle is arranged so as to extend along another side opposite to one side of the case. The grip handle comprises an elongated grip portion and a pair of legs provided at both ends of the grip portion,
The bypass tool for a watt-hour meter according to claim 9, wherein the leg portion and the grip portion have a plate shape extending in a direction orthogonal to the opposite side wall portion of the case.   The opposite side wall portion has an area where the thumb is located when the operator holds the grip handle so that the thumb of the worker is positioned on the other side of the grip handle. The bypass tool for a watt-hour meter according to claim 8, wherein an insulating portion extending beyond is provided.   The wattmeter bypass tool according to claim 11, wherein the insulating portion is formed integrally with the case.   The bypass tool for an electric energy meter according to claim 11, wherein the insulating portion is an insulating plate attached on the opposite side wall portion.   The bypass tool for a watt-hour meter according to any one of claims 8 to 10, wherein the grip handle is formed integrally with the opposite side wall portion.   The bypass tool for a watt-hour meter according to any one of claims 8 to 10, wherein the grip handle is composed of a separate member attached to the opposite side wall portion. The pair of connection terminal portions of the one or more bus bars are arranged along one side of the case,
A pair of sides located on both ends of the one side of the case and extending in a direction intersecting the one side are opposed to the pair of side surfaces of the terminal block when the case is pressed against the terminal block. The bypass tool for watt-hour meters according to claim 1 or 2, wherein a pair of guide walls are provided for positioning in a direction in which the one side of the case extends with respect to the block.

Images