JP6676315B2 - Watt hour meter bypass tool - Google Patents

Description

  The present invention relates to a watthour meter bypass tool including a bus bar for short-circuiting between terminals provided on a terminal block of a watthour meter.

  The watt hour meter needs to be replaced periodically for the purpose of guaranteeing and maintaining accuracy. This is a replacement work following the expiration of the validity period of the test, and is also called a check-out work. Since it is necessary to remove the electric wire connected to the watt hour meter at the time of replacement work, a bypass tool for watt hour meter has been conventionally used so that the replacement work can be performed without interruption. . The watt hour meter bypass tool short-circuits a pair of terminals consisting of a combination of a terminal connected to the power supply side wire and a terminal connected to the load side wire provided on the terminal block of the watt hour meter. In the state, the watt hour meter is replaced. In a conventional watt-hour meter, the electric wire is completely cut off by using a watt-hour meter bypass tool to electrically connect the wire and the bypass tool (for example, Japanese Patent Application Laid-Open No. 2010-217155 [Patent Document 1]). ).

  Recently, a so-called smart meter, which is a watt-hour meter having a function of performing digital signal processing of measured power and a communication function of communicating digital signals, is becoming widespread. A female thread portion is formed in the terminal portion of the terminal block of the smart meter as in a terminal block of the type shown in FIG. 3A attached to the specification of the present application. There is a tool that can attach a bypass tool to short-circuit the terminals. Therefore, as compared with the conventional watt hour meter which needs to be connected by pushing off the covering of the electric wire, the work of mounting the bypass tool for the watt hour meter becomes easier.

JP 2010-217155 A

  Since the replacement work of the watt hour meter using the watt hour meter bypass tool is performed without interruption, workers should be careful not to get an electric shock, such as using insulating gloves, when tightening and loosening the screws. You need to work while paying. In addition, 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 power meter bypass tool using the female thread formed on the terminal part of the terminal block and when removing the tool, fine work is not required, and the screw is tightened and loosened. It is required that work can be performed safely and easily. Further, it is also required to have excellent durability to withstand repeated use.

  An object of the present invention is to prevent a fall of a screw when screwing and removing a wattmeter bypass tool from a terminal block by using a female screw portion provided at a terminal portion of a terminal block of a watthour meter. Another object of the present invention is to provide a watthour meter bypass tool that can reliably short-circuit the terminals of the terminal block by an operation of fixing the watthour meter bypass tool.

  It is another object of the present invention to provide a watt hour meter bypass tool which has excellent durability and allows easy replacement of parts.

  Still another object of the present invention is to provide a watt-hour meter bypass tool that is highly convenient during transportation.

  Yet another object of the present invention is to provide a watt-hour meter bypass tool having a shape that is easy to grasp and easy to tighten screws.

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

  Still another object of the present invention is to provide a watt-hour meter bypass tool that can handle a plurality of types of terminal blocks.

  The present invention provides an improved watthour meter bypass tool including a bus bar that connects a pair of connection terminals to a pair of terminals provided on a terminal block of the watt hour meter with a pair of screws to short-circuit the pair of terminals. It is targeted for. A bypass tool for a watt hour meter according to the present invention includes a pair of case halves formed of an insulating material, and a case for storing a bus bar with a pair of connection terminal portions of the bus bar being exposed, and a pair of case halves. And a pair of screwing members arranged between one half of the case arranged so as not to face the terminal block and the pair of connection terminal portions to prevent the pair of screws from coming off.

  The screw has, at one end, a male screw part to be screwed to a female screw part provided in the terminal of the terminal block, 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 dimension. A pair of connection terminal portions of the bus bar are formed with a terminal portion side through hole through which a male screw portion of the screw penetrates, and a case side through hole through which a male screw portion of the screw penetrates is formed in one half of the case. Have been. One end of the screwing member is fitted into the case-side through-hole, and the other end is in contact with the connection terminal portion so as not to block the terminal-portion-side through-hole, and projects radially inward from the inner peripheral portion. And a cylindrical body formed with a female threaded part through which a non-threaded part penetrates after a male threaded part is screwed into the inner peripheral surface of the projected part.

  According to the watt hour meter bypass tool of the present invention, the male screw portion that has passed the female screw portion of the screw member toward the connection terminal portion side is engaged with the male screw portion of the screw with the female screw portion of the screw member while pulling the screw. In this state, unless the screw is turned in the reverse direction, the screw does not fall out of the screwing member. Therefore, even when the worker wears insulating gloves, the screw does not fall off from the watt-hour meter by-pass tool, so that the screw can be easily tightened. Further, by screwing the screw into the female screw portion of the terminal of the terminal block, the connection terminal portion surely comes into contact with the terminal of the terminal block, so that the terminal of the terminal block can be reliably short-circuited. Further, since it is not necessary to separately carry the main body and the screw of the watt-hour meter by-pass tool, the convenience in carrying is improved.

  Further, the bypass tool for the watt hour meter of the present invention uses the screwing member as a separate member from the case.Therefore, an annular protrusion is provided inside the cylinder provided in the screwing member, and the female screw portion is provided on the protrusion. It can be easily formed. Further, even when the number of bus bars is different, the screwing member can be used as a general-purpose part, so that the cost of the bypass tool for the watt hour meter can be reduced. In addition, even when the diameter of the female screw portion provided on the terminal of the terminal block is different, it can be dealt with by replacing the screwing member. Furthermore, if the internal thread of the screwing member is worn or chipped and needs to be replaced by repeating the tightening and loosening of the screw and the screw moving in the cylinder, the case can be disassembled and removed 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 abrasion between the screw to be combined and to make the shape hard to change due to temperature change, the screwing member is made of It is desirable that the cylindrical member to be formed be a member made of metal, ceramic, or the like.

  The number of bus bars needs to be a number corresponding to the number of pairs of terminals 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 the terminal block of the terminal block to be short-circuited is two, it is only necessary to provide two bus bars.

  In the case where some of the pairs of terminals provided in the terminal block of the watt-hour meter need to be short-circuited, a bus bar corresponding to the number of terminals may be provided. For example, when there are a plurality of pairs of terminals, 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 wattmeter by a first pair of screws. A first bus bar for short-circuiting the first pair of terminals, and a second pair of connection terminal portions connected to the second pair of terminals of the plurality of terminals by a second pair of screws. A second bus bar for short-circuiting the pair of terminals may be provided. In the case where the first and second bus bars are provided in one electric energy meter bypass tool as described above, the two bus bars can be attached to the terminal block by one attaching operation.

  The configuration in which the cylindrical body is fitted into the case-side through-hole is arbitrary. For example, a small-diameter portion that fits into the case-side through-hole is formed on one end side of the outer peripheral portion of the cylindrical body. A large-diameter portion having a diameter larger than the diameter of the case-side through-hole is provided adjacent to the case, and the end surface of the large-diameter portion on the side of the small-diameter portion can be configured to abut one half of the case. With this configuration, the cylindrical body can be fixed only by inserting the small-diameter portion of the cylindrical body into the case-side through-hole.

  A coil spring that is disposed between the screw head and the protrusion of the cylindrical body while being passed 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 manner, in a state where the screw is screwed with the male screw portion of the screw with the female screw portion of the terminal block, the energy stored in the coil spring acts in a direction to separate the head of the screw from the case, Prevents screws from loosening. Further, when the screw is not screwed into the female screw portion of the terminal block, the direction of the screw shaft is maintained in the direction in which the cylindrical body extends, and the work of attaching the watt-hour meter bypass tool becomes easy. In a state where the screw is not attached to the terminal block, the coil spring expands, and a part of the screw is drawn into the cylinder, thereby improving portability.

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

  A partition may be formed in one half of the case to surround the screw head of the screw. In this way, the creepage distance between the adjacent screws can be increased, and the insulation can be improved.

  The tip shape of the screw is arbitrary. For example, if the distal end portion has a sharp point (conical shape), when screwing into the female screw portion provided on the terminal of the terminal block, it becomes easier to position the distal end of the screw into the female screw portion.

  The bypass tool for a watt hour meter of the present invention, when pressing the case to the terminal block when tightening the screw on the opposite side wall portion located on the side opposite to the wall portion facing the terminal block of the case, the screw, A grip for the operator to grip with one hand may be provided at a position where the tightening operation is not hindered. If the grip handle is located 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 for grip may be formed integrally with the opposite side wall portion, or may be formed of a member separate from the opposite side wall portion.

  The arrangement position of the grip for the grip may be any position that does not hinder the screw tightening operation.For example, when a pair of connection terminal portions of one or more bus bars are arranged 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. By arranging the grip handle at this position, the distance between the connection terminal portion and the screw at which a high voltage appears during the operation and the hand of the operator holding the grip handle can be increased, resulting in an electric shock. Accidents can be prevented.

  The shape of the grip for gripping is arbitrary. For example, it may include an elongated grip portion and a pair of legs provided at both ends of the grip portion, and the leg portion and the grip portion may have a plate-like shape extending in a direction orthogonal to the opposite side wall of the case. With this shape, the shape is easy to grasp even when the worker wears the insulating glove.

  If the operator grips the grip handle so that the operator's thumb is positioned on one side of the grip handle, the thumb may reach a position beyond the contour of the case. In this case, depending on the shape of the terminal block, the thumb may touch the terminal of the terminal block, the electric wire connected to the terminal, or the like. For such a case, it is desirable to provide an insulating portion extending beyond the region where the thumb is located.

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

  When the insulating portion is formed of an insulating plate, the insulating plate can be prepared as a separate component from the case. For this reason, attach an insulating plate only when attaching the wattmeter bypass tool to a terminal block where the operator's thumb may touch the terminals of the terminal block or the wires connected to the terminals. When attaching a wattmeter bypass tool to a terminal block of the type, it is possible to obtain a wattmeter bypass tool that can support multiple types of terminal blocks, such as removing the insulating plate. 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 for fixing the electric wire (see FIG. 3A) is housed in the terminal block so as not to protrude from the surface of the terminal block. However, depending on the diameter of the electric wire to be connected and the type of the terminal block. May be fixed in a state in which the screws for fixing the wires protrude beyond the surface of the terminal block. In this case, when attempting to perform work using the watt hour meter bypass tool, the connection terminal of the watt hour meter bypass tool accidentally touches the screw that secures the electric wire, causing an unexpected short circuit. May be lost. Therefore, a guide wall for positioning the watthour bypass tool with respect to the terminal block can be provided. When the pair of connection terminal portions of the one or more bus bars are arranged along one side of the case, the guide wall includes a pair of sides located at both ends of the one side of the case and extending in a direction intersecting the one side. What is necessary is just to provide a pair. With the pair of guide walls, when the case is pressed against the terminal block, it is possible to position the terminal block in the direction in which one side of the case extends with respect to the pair of side surfaces of the terminal block. With the pair of guide walls, the connection terminal of the wattmeter bypass tool is prevented from accidentally touching the screw for fixing the electric wire.

  The pair of guide walls may be formed integrally with one of the case halves, or may be formed of a guide wall constituent member which is a separate member fixed to the opposite side wall portion. When a separate guide wall component is prepared, one guide wall component having a pair of guide walls may be prepared. Further, a pair of divided guide wall components fixed to a pair of opposite sides of the case may be prepared.

It is a disassembled perspective view of the bypass tool for electric energy meters of this Embodiment. (A) is a plan view of the watt hour meter 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 showing a bypass tool for a watt hour meter and a first type of terminal block to which the bypass tool for a watt hour meter is attached, and (B) is a perspective view of the first type of a bypass tool for a watt hour meter. It is a perspective view which shows the state attached to the terminal block of FIG. (A) is an enlarged sectional view showing a state where the watt-hour meter bypass tool is pressed against the terminal block, and (B) is an enlarged sectional view showing a state where the watt-hour meter bypass tool is screwed to the terminal block. It is. It is an exploded perspective view of the bypass tool for electric energy meters of a 2nd embodiment. (A) is a perspective view showing a bypass tool for a watt hour meter and a second type of terminal block for mounting the bypass tool for a watt hour meter, and (B) is a perspective view of the second type of the bypass tool for a watt hour meter. It is a perspective view which shows the state attached to the terminal block of FIG. It is a figure showing an insulating plate used for an electric energy meter bypass tool of a 3rd embodiment. It is a perspective view showing the state where the bypass tool for electric energy meters of a 3rd embodiment was attached to the terminal block of the 2nd type. It is a figure which shows the bypass tool for electric energy meters of 4th Embodiment, (A) is a perspective view which shows the bypass tool for electric energy meters, and the 1st type terminal block which attaches the bypass tool for electric energy meters. (B) is a perspective view showing a state where the watt-hour meter bypass tool is attached to the first type terminal block. It is a figure which shows the bypass tool for electric energy meters of 5th Embodiment, (A) is a perspective view which shows the bypass tool for electric energy meters, and the 1st type terminal block which attaches the bypass tool for electric energy meters. (B) is a perspective view showing a state where the watt-hour meter bypass tool is attached to the first type terminal block. It is a figure which shows the bypass tool for electric energy meters of 6th Embodiment, (A) is a perspective view which shows the bypass tool for electric energy meters, and the 1st type terminal block which attaches the bypass tool for electric energy meters. (B) is a perspective view showing a state where the watt-hour meter bypass tool is attached to the first type terminal block.

  Hereinafter, an embodiment of a watt-hour meter by-pass tool of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a watthour meter bypass tool of the present embodiment, FIG. 2A is a plan view of the watthour meter 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. Note that the left side view is not shown because it appears symmetrically with the right side view.

  First, in the specification of the present application, as shown in FIG. 1, a plurality of directions are defined for the electric power meter bypass tool 1. That is, a left-right direction (first direction D1) composed of a right direction Ri and a left direction Le, a front-rear direction (second direction D2) composed of a forward direction Fo and a backward direction Re, and a vertical direction composed of an upward direction Up and a 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]
1 and FIGS. 2 (A) to 2 (E) show a watt hour meter used for a terminal block used in a three-wire 120A smart meter (watt hour meter). It is a bypass tool. As shown in an exploded perspective view of FIG. 1, a wattmeter bypass tool 1 of the present embodiment mainly includes a case 3, two bus bars 5 and 7 housed in the case 3, and four And four screwing members 11 constituted by a cylinder corresponding to the screw 9.

<Case>
The case 3 has a rectangular shape with a long side extending in the first direction D1 and a short side extending in the third direction D3, and is configured by combining a pair of case halves 13 and 15. 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 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 into which the screwing members 11 are fitted are formed along the long side 17. A partition wall 19A surrounding the screw head 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 screw member supporting portion for supporting the screw member 11 is formed on the back surface. 19B are formed. A positioning bulging portion 20 is also formed near the long side 17 along with the case-side through-hole 19. In the present embodiment, as described later, since 2S (the power supply side) and 2L (the load side) are electrically connected inside the terminal block, a bus bar for that purpose is not provided, and the terminal of the bus bar is not provided. Instead of the connecting portion, the positioning bulging portion 20 is provided at a position corresponding to the position of the terminal to which the electric wire of the terminal block 2S (power supply side) is connected when the watt hour meter bypass tool 1 is attached to the terminal block. Is formed. In the present embodiment, the bulging portion is not formed at the position corresponding to the position of the terminal to which the 2L (load side) wire of the terminal block is connected, but it is needless to say that the bulging portion may be formed. is there.

  A grip 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 located in the lower direction Lo facing the long side 17. The grip 23 includes an elongated grip 25 and a pair of legs 27 provided at both ends of the grip 25, and is formed integrally with the case half 13. The grip portion 25 and the leg portion 27 are plate-shaped extending in a direction orthogonal to the wall of the case half 13.

  In the vicinity of the pair of short sides 29, 29 of the case half 13, engagement portions 31, 31 extending along the short side 29 and protruding toward the case half 15 are formed. The engaging portions 31, 31 form a snap-fit structure with the engaged portions 33, 33 formed on the case half portion 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 of the case half 13, an electric wire display 37 indicating the correspondence between the screws and the corresponding terminals of the terminal block is described.

  On the inner wall of the case half 15 facing the case half 13, bus bar storage recesses 39 and 41 for storing the bus bars 5 and 7 are formed. The busbar storage recesses 39 and 41 are open toward the case half 13. The bus bar housing concave portion 39 includes a peripheral wall portion 40A formed along three sides except 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 has a U-shape in a front view formed by being surrounded by the portion. The busbar storage recess 41 has a rectangular shape in a front view formed by being surrounded by the central peripheral wall portion 40B and the inner wall portion of the case half 15. In the busbar housing recess 39, two locking pieces 43, 43 projecting in the second direction D2 from the central peripheral wall portion 40B toward the inside of the busbar housing recess 39 are formed. A part of the bus bar accommodating recess 39 is narrowed by the locking pieces 43, 43, so that the bus bar 5 accommodated in the bus bar accommodating recess 39 is prevented from moving in the left-right direction. In the busbar storage recess 39, openings 47, 47 which open upward are formed at locations along the long side 45 on the upper side of the case half 15, and the busbar 5 is stored in the busbar storage recess 39. The pair of connection terminal portions 48 and 49 provided at the end of the case 5 are exposed outside the case 3.

  Locking pieces 51, 51 protruding in the second direction D <b> 2 from the central peripheral wall portion 40 </ b> B into the busbar storing recess 41, and locking pieces 53, 53 protruding in the third direction D <b> 3. Are formed, and a T-shaped locking piece 55 is also formed at the center of the bus bar accommodating 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 storing recess 41 is difficult to move. Further, the bus bar storage recess 41 is also formed with openings 57, 57 which are open upward at positions along the long sides 45, and are provided at the ends of the bus bar 7 in a state where the bus bar 7 is stored. The pair of connection terminal portions 58 and 59 are exposed outside the case 3.

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

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

  The pair of connection terminal portions 48 and 49 are formed in a step shape by bending an end of the bus bar 5, and include terminal contact portions 48 A and 49 A extending parallel to the plate surface of the bus bar 5, and a 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 step shape by bending the end of the bus bar 7, and include terminal contact portions 58 A and 59 A extending parallel to the plate surface of the bus bar 7 and a bus bar 7. And the orthogonal portions 58B and 59B orthogonal to the terminal contact portions 58A and 59A. The terminal contact portions 48A, 49A are formed with terminal portion side through holes 48C, 49C, and the terminal contact portions 58A, 59A are formed with terminal portion side through holes 58C, 59C.

<Screws>
As shown in FIG. 1, the screw 9 has a male screw part 9A at one end, a screw head 9B at the other end, and a maximum of the male screw part 9A between the male screw part 9A and the screw head 9B. It has a non-threaded portion 9C having a diameter equal to or less than the outer diameter. 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-threaded portion 9 </ b> C. Has become.

<Screw member>
The screwing member 11 is formed of a metal cylinder having a through-hole directed in the second direction D2, and has a small-diameter portion 11A fitted into the case-side through-hole 19 and a small-diameter portion on the outer peripheral portion. A large-diameter portion 11B having a larger diameter than 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 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 screw member 11 is attached to the case half 13. Fixed against. An annular protrusion 65 is provided on the inner peripheral portion of the screwing member 11 to protrude radially inward. 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. However, it is a matter of course that other materials such as ceramic may be used.

[assembly]
As shown in FIG. 1, the electric power meter bypass tool 1 is assembled as follows.
(1) The screw 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 comes into contact with 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, 31 are engaged with the engaged portions 33, 33, and the case half 15 is fitted to the case half 13. As a result, the bus bars 5, 7 are sandwiched by the pair of case halves 13, 15, and the bus bar is so arranged that the screwing member 11 does not block the terminal portion side through holes 48C, 49C, 58C, 59C. The contact terminals 48A, 49A, 58A, and 59A of the connection terminals 5 and 7 are in contact with each other.
(4) After (3), the screw 9 having the washer 61 and the coil spring 63 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 9A is screwed over the female screw 67 formed on the protrusion 65 until the non-thread 9C passes through the protrusion 65 in the screwing member 11. . As a result, in a state where the male screw portion 9A of the screw 9 is screwed with the female screw portion 67 of the screw member 11 while pulling the screw 9, the screw 9 comes off from the screw member 11 unless the screw 9 is turned backward. There is no.

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

  The terminal block 69 is a terminal block of a three-wire 120A smart meter. The terminal block 69 is configured such that a plurality of metal terminals electrically connected to each other are built in an insulating terminal block main body 71. The terminals of the terminal block 69 include a pair of terminals 73A, 73B, 2S (power side) and 2L (load side) to which outermost 1S (power side) and 1L (load side) wires are connected. There are a total of six connected terminals 75A and 75B, and a pair of terminals 77A and 77B to which the innermost 3S (power 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. 3A, on the lower front surface of the terminal block 69, openings 79A, 79B, 81A, 81B, where a part of the terminals 73A, 73B, 75A, 75B, 77A, 77B are exposed, respectively. 83A and 83B are formed. Female terminals 74A, 74B, 76A, 76B, 78A, 78B are formed at the positions of the openings in each terminal. The electric power meter 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, first, referring to the electric wire display 37, the terminal contact portions 48A, 49A are firstly connected to the openings 79A, 79B. A watt hour meter is provided in front of the terminal block 69 such that the terminal contact portions 58A and 59A face the openings 83A and 83B so as to face each other, and the positioning bulging portion 20 faces the opening 81A. Hold the bypass tool 1. In this case, if the operator holds the grip 23 with one hand, it is easy to perform the operation. Further, since the grip 23 is provided at a position away from the screw 9, the operator holds the grip 23. The user's hand is separated from the part where the voltage appears, and it is possible to work safely. Next, as shown in FIG. 3B, the electric power 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. With this operation, the terminal contact portion 48A and the terminal 73A come into contact with each other, and the terminal contact portion 49A and the terminal 73B come into contact with each other, and the power supply 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, and the terminal contact portion 59A and the terminal 77B are in contact with each other, and the power supply side and the load side are short-circuited by the bus bar 7. The scale is replaced during this short circuit condition.

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

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

  The screw 9 is passed so that the non-screw part 9 </ b> C passes through the female screw part 67 of the protrusion 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 protrusion 65, the male screw 9A engages with the end of the protrusion 65 so that the screw 9 does not fall out of the screwing member 11. It has become. In a state where the screw 9 is not screwed into the female screw portion 74A of the terminal block 69, the force of the coil spring 63 applied to the screw head 9B (including the washer 61) and the end of the protruding portion 65 in the separating direction. , The male screw portion 9A is drawn into the space S formed by the screw member 11 and the terminal portion side through hole 48C, and the axis of the screw 9 extends in the direction in which the cylindrical body (the screw member 11) extends. Is maintained, and the work of mounting the electric power 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 protrusion 65 of the screwing member 11 to the terminal portion side through hole 48C. Therefore, the male screw portion 9A is completely housed in the space S. Therefore, the portability of the electric power 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 in the terminal 73A direction 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 facilitated. In the process of rotating the screw 9 until the screw head 9B (including the washer 61) comes into contact with the end surface of the small diameter portion 11A of the screwing member 11, and screwing the screw 9, the coil spring 63 is charged. Thus, the energy stored in the coil spring 63 acts in a direction in which the screw head 9B is separated from the case 3 to prevent the screw 9 from being loosened. When the structure in which the screw head 9B (including the washer 61) abuts on the end face of the small diameter portion 11A of the screwing member 11, 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 life of the tool can be extended.

[Second embodiment]
FIG. 5 is an exploded perspective view of a watt-hour meter bypass tool according to the second embodiment, and FIG. 6A is a second type to which the watt-hour meter bypass tool and the watt-hour meter bypass tool are attached. FIG. 3B is a perspective view showing a terminal block of the second type, and FIG. 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. Description is omitted.

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

  When trying to attach the watt-hour meter bypass tool 1 of the first embodiment to the second type terminal block 169, an operator touches the electric wire connection portion 185 or the electric wire, and an electric shock accident occurs. May be lost. That is, when the operator grips the grip 23 so that the thumb of the operator is located on the longer side 21 side of the grip 23, the thumb may reach a position beyond the contour of the case 3. . In this case, there is a possibility that the thumb touches the wire connection portion 185 of the terminal block 169 or the wire. For such a case, the watt hour meter 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 portion 187 is an extension of the case half 113 provided to extend downward from the long side 121 of the case half 113, and the insulating portion 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 wire connecting portion 185 during the mounting operation, and the operator's thumb touches the wire connecting portion 185 and the wire. Eliminate the possibility.

[Third Embodiment]
FIG. 7 is a diagram showing an insulating plate used for a watt hour meter bypass tool according to the third embodiment. FIG. 8 is a diagram showing a watt hour meter bypass tool according to the third embodiment of the second type. It is a perspective view which shows the state attached to the terminal block of FIG. 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. Description is omitted.

  A watt-hour meter bypass tool 201 according to the third embodiment is similar to the watt-hour meter bypass tool 101 according to the second embodiment, and is compatible with a second type terminal block 269. It is. The watt-hour meter bypass tool 201 of the third embodiment is the same as the watt-hour meter bypass tool 1 of the first embodiment, but corresponds to the terminal block 269 of the second type. An insulating plate 289 is provided to be attached to the grip handle 223 that forms an insulating part.

  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 conforming to the shape of the grip handle 223, and as shown in FIG. 8, the other long side 289B of the insulating plate 289 is located at a position distant from the electric power meter bypass tool 201. The insulating plate 289 is attached to the watt-hour meter by-pass tool 201 through the through-hole 291 through the grip handle 223. Thus, as in the second embodiment, an insulating portion extending beyond the region where the thumb of the operator is located can be configured. Therefore, when the insulating plate 289 is provided and the gripping handle 223 is used to attach to the wattmeter bypass tool 201 as in the third embodiment, the electric energy of the first embodiment can be reduced. Without changing the design of the meter bypass tool 1, it is possible to obtain a watt hour meter bypass tool that can correspond to a plurality of types of terminal blocks of the first type and the second type of terminal block.

[Fourth Embodiment]
FIG. 9: is a figure which shows the bypass tool for electric energy meters of 4th Embodiment, (A) is a 1st type terminal block which attaches the bypass tool for electric energy meters and the bypass tool for electric energy meters. FIG. 3B is a perspective view showing a state in which a watt-hour meter bypass tool is attached to a first 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. 9 (A), a watt hour meter bypass tool 301 of the fourth embodiment includes a pair of guide walls 393A extending in a rearward direction Re from a pair of short sides 318A, 318B of a case half 313. 393B are 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 arranged outside the terminal block 369. Therefore, when the watt-hour meter bypass tool 301 is aligned and pressed so that the right and left directions with respect to the terminal block 369 are appropriate, the pair of guide walls 393A and 393B move along both side surfaces of the terminal block 369, and the terminal block 369 is moved. The block 369 is sandwiched, and the watt hour meter bypass tool 301 can be attached to an appropriate position of the terminal block 369.

  On the other hand, when the electric power meter bypass tool 301 is pressed against the terminal block 369 in a state where the position thereof in the left-right direction with respect to the terminal block 369 is shifted, one of the pair of guide walls 393A, 393B comes into contact with the terminal block 369. Would. Therefore, the connection terminal portions 348, 349, 358, 359 (particularly, the terminal contact portions 348A, 349A, 358A, 359A) of the watt hour meter 301 do not contact the terminal block 369, and the connection terminal portions 348, 349 , 358, 359 no longer accidentally touch the screw N for fixing the electric wire.

[Fifth Embodiment]
Drawing 10 is a figure showing the bypass tool for electric energy meters of a 5th embodiment, and (A) is a bypass block for electric energy meters, and a terminal block of the 1st type to which a bypass tool for electric energy meters is attached. FIG. 3B is a perspective view showing a state in which a watt-hour meter bypass tool is attached to a first type terminal block. In FIG. 10, the same members as those in the embodiment shown in FIG. 9 are denoted by the same reference numerals as those in FIG.

  The bypass tool 401 for the watt hour meter according to the fifth embodiment includes one guide wall component 490 fixed to the case half 413. The guide wall forming 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 constituent member 490 is fixed to the case half 413 using fixing fittings 495 and 495 passed through the through holes 494 and 494.

[Sixth Embodiment]
FIG. 11: is a figure which shows the bypass tool for electric energy meters of 6th Embodiment, (A) is a 1st type terminal block which attaches the bypass tool for electric energy meters, and the bypass tool for electric energy meters. FIG. 3B is a perspective view showing a state in which a watt-hour meter bypass tool is attached to a first type terminal block. In FIG. 11, the same members as those in the embodiment shown in FIG. 10 are denoted by the same reference numerals as those in FIG.

  The watt hour meter bypass tool 501 of the sixth embodiment includes a pair of divided guide wall components 590A and 590B fixed to the case half 513. The divided guide wall constituting member 590A includes a fixing portion 592A and a guide wall 593A. The fixing portion 592A has two pairs of through-holes 594, 594, and 594 ′ arranged in a vertical direction. , 594 'are formed. Further, the divided guide wall constituting member 590B includes a fixing portion 592B and a guide wall 593B. The fixing portion 592B has two through holes 594, 594 arranged in a vertical direction. 594 ', 594' are formed. The pair of divided guide wall constituting members 590A, 590B is fixed to the case half 513 using fixing metal pieces 595 passed through a set of through holes 594. In the present embodiment, the divided guide wall constituting members 590A and 590B are fixed using the set of through holes 594, but the set of through holes 594 ′ is used in accordance with the left and right dimensions of the terminal block to be attached. This embodiment has an advantage in that the divided guide wall constituting members 590A and 590B can be fixed by using the same.

  The above embodiment is described as an example, and the present invention is not limited to the present embodiment unless departing from the gist thereof. For example, the terminal block to which the by-pass tool for the watt hour meter according to the present invention can be attached is not limited to the terminal block of the type shown in the above-described example, and a terminal block of a 2-wire type smart meter for 30A or a 3-wire type. The configuration can be changed so that it can be attached to a terminal block of a smart meter for 60A of the formula. In the case of the terminal block of the smart meter for two wires of 30A, the number of bus bars is one or two. Also in this case, an insulating portion can be provided according to 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 separate from the case, and may be attached to a half portion of the case by screwing or fitting. By doing so, the case can be easily formed. In addition, if the fixing structure is used for fixing via the bus bar stored in the case at the time of attachment, the grip for grip can be more firmly fixed using the bus bar.

  ADVANTAGE OF THE INVENTION According to this invention, when using the female screw part provided in the terminal part of the terminal block of the watthour meter, when screwing and removing the bypass tool for watthour meters to a terminal block, it prevents falling of a screw. Further, by fixing the watt-hour meter bypass tool, it is possible to obtain a watt-hour meter bypass tool that can reliably short-circuit the terminals of the terminal block. Further, according to the present invention, it is possible to obtain a watt hour meter bypass tool having excellent durability and easy replacement of components. Further, according to the present invention, it is possible to obtain a watt-hour meter bypass tool that is highly convenient during transportation. In addition, it is possible to obtain a watt-hour meter bypass tool having a shape that is easy to grasp and easy to tighten a screw. Further, it is possible to obtain a watthour meter bypass tool capable of preventing an electric shock of a hand held by an operator. Further, it is possible to obtain a watt hour meter bypass tool that can support a plurality of types of terminal blocks.

Reference Signs List 1 bypass tool for watt-hour meter 3 case 5, 7 bus bar 9 screw 9A male screw part 9B screw head 9C non-thread part 11 screw fixing member (cylindrical body)
11A Small-diameter portion 11B Large-diameter portion 13, 15 Case half portion 17, 21 Long side 19 (of case half portion 13) Case-side through hole 19A Partition wall portion 19B Screw member support portion 20 Positioning bulging portion 23 Gripping handle 25 Handle 27 Leg 29 Short side 31 (of case half 13) Engagement part 33 Engaged part 37 Wire display 39, 41 Busba storage recess 43 Locking piece 45 Long side 47 (of case half 15) Opening 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 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 67 Female screw part 69 Terminal block 71 Terminal block body 73 , 73B, 75A, 75B, 77A, 77B a pair of terminals 79A, 79B, 81A, 81B, 83A, 83B opening

Claims (16)

A watt hour meter bypass tool comprising a bus bar that is connected to a pair of terminals provided on a terminal block of the watt hour meter by a pair of screws and short-circuits the pair of terminals,
A case configured by 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 arranged between one of the case halves arranged so as not to face the terminal block and the pair of connection terminal portions to prevent the pair of screws from coming off. Consisting of a screw member
The screw has a male screw portion screwed to a female screw portion provided on 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. Having a non-threaded portion having a diameter equal to or less than the maximum outer diameter of the externally threaded portion,
In the pair of connection terminal portions of the bus bar, a terminal portion side through hole through which the male screw portion of the screw penetrates is formed,
The one case half has a pair of case-side through-holes through which the male screw portions of the pair of screws penetrate,
One end of the screwing member is fitted into the case-side through hole, and the other end is in contact with the connection terminal portion so as not to block the terminal portion-side through hole, and protrudes radially inward from an inner peripheral portion. An electric power characterized by comprising a cylindrical body having an annular projecting portion, and a female threaded portion through which the non-threaded portion is formed after the male threaded portion is screwed to the inner peripheral surface of the projecting portion. Meter bypass tool. A first pair of connection terminal portions are connected to a first pair of terminals among a plurality of pairs of terminals provided in the terminal block of the watt hour meter by a first pair of screws to connect the first pair of terminals. A first bus bar to be short-circuited and a second pair of connection terminals connected to a second pair of terminals of the plurality of terminals by a second pair of screws to short-circuit the second pair of terminals. A power tool bypass tool comprising:
It is composed of a pair of case halves formed of an insulating material, with the first pair of connection terminals of the first bus bar and the second pair of connection terminals of the second bus bar being exposed. A case for accommodating the first bus bar and the second bus bar;
One of the pair of case halves, which is disposed so as not to face the terminal block, and the first pair of connection terminal portions of the first bus bar and the second of the second bus bar. A first pair of screw members and a second pair of screws disposed between the first pair of connection terminals and the second pair of connection terminals to prevent the first pair of screws and the second pair of screws from coming off. It consists of a stop member,
The screw has a male screw portion screwed to a female screw portion provided on 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. Having a non-threaded portion having a diameter equal to or less than the maximum outer diameter of the externally 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 each have a terminal portion side through hole through which the male screw portion of the screw passes. Is formed,
In the one case half, four case-side through-holes through which the male screw portions of the first pair of screws and the second pair of screws penetrate are formed,
One end of the screwing member is fitted into the case-side through hole, and the other end is in contact with the connection terminal portion so as not to block the terminal portion-side through hole, and protrudes radially inward from an inner peripheral portion. An electric power characterized by comprising a cylindrical body having an annular projecting portion, and a female threaded portion through which the non-threaded portion is formed after the male threaded portion is screwed to the inner peripheral surface of the projecting portion. Meter bypass tool.   A small-diameter portion that fits into the case-side through-hole is formed at the one end of the outer peripheral portion of the cylindrical body, and has a diameter larger than the diameter of the case-side through-hole adjacent to the small-diameter portion. 3. The bypass tool for an electric energy meter 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. Further provided is a coil spring disposed between the screw head and the protrusion of the cylindrical body while being passed through the non-threaded portion of the screw,
The bypass tool for an electric energy meter according to claim 1 or 2, wherein the coil spring is charged when the screw is screwed into the terminal block.   The male screw portion of the screw has a length accommodated 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 watthour meter bypass tool according to any one of claims 1 to 4, having a dimension.   The bypass tool for an electric power meter according to any one of claims 1 to 5, wherein a partition wall surrounding a periphery of the screw head of the screw is formed in the one half case.   The watt-hour meter bypass tool according to any one of claims 1 to 6, wherein the screw has a pointed tip. The one case half has a first long side extending along the pair of case-side through-holes, a second long side facing the first long side, the first long side, and the first long side. A pair of short sides connecting the two long sides,
2. The bypass tool for an electric energy meter according to claim 1, wherein a grip handle for an operator to grip with one hand is provided along the second long side on a front surface of the one case half. The one case half has a first long side extending along the four case-side through holes, a second long side facing the first long side, the first long side, and the first long side. A pair of short sides connecting the two long sides,
The bypass tool for a watt hour meter according to claim 2, wherein a grip handle for a worker to grip with one hand is provided along the second long side on a front surface of the one case half. The grip handle includes an elongated grip portion and a pair of legs provided at both ends of the grip portion,
The watt-hour meter bypass tool according to claim 8 or 9, wherein the leg and the grip have a plate shape extending in a direction orthogonal to the one half of the case . The watt-hour meter bypass tool according to claim 8 or 9, wherein an insulating portion extending beyond the second long side is provided in the one case half .   The bypass tool for a watt hour meter according to claim 11, wherein the insulating portion is formed integrally with the one case half.   The bypass tool according to claim 11, wherein the insulating portion is an insulating plate mounted on the front surface of the one case half.   The watt-hour meter bypass tool according to any one of claims 8 to 10, wherein the grip handle is formed integrally with the one case half.   The watt-hour meter bypass tool according to any one of claims 8 to 10, wherein the grip handle is formed of a separate member attached to the one case half. On the pair of short sides of the one case half, a pair of guide walls that move along a pair of side surfaces of the terminal block and sandwich the terminal block when the case is pressed against the terminal block are provided. The watt-hour meter bypass tool according to claim 8 or 9, wherein

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