JP2018025468A - Uninterruptible replacement tool - Google Patents

Abstract

The present invention provides an uninterruptible replacement tool capable of suppressing poor contact between a contact pin and a terminal of a terminal block. An uninterruptible replacement tool is attached to a terminal block of a watt hour meter having a charging terminal that is a charging part and a non-charging terminal that is not a charging part and has a female screw. The uninterruptible replacement tool includes a case, a fixing screw protruding from the case and attached to the female screw, and a contact pin protruding from the case and brought into contact with the surface of the charging terminal. [Selection diagram] FIG.

Description

  The present invention relates to an uninterruptible replacement tool.

  When replacing the watt-hour meter for measuring power consumption for replacement, inspection, repair, etc., use an uninterruptible replacement tool to ensure that there is no power outage so as not to cause a power failure during the replacement work. Total replacement work is performed. Specifically, the watt-hour meter replacement work is performed in a state where the power supply side wiring and the load side wiring connected to the watt-hour meter are short-circuited by the uninterruptible replacement tool. As described above, for example, a watt-hour meter bypass tool described in Patent Document 1 is known as a tool for performing an watt-hour meter replacement operation without a power failure.

JP 2009-150753 A

  The watt-hour bypass tool of Patent Document 1 is fixed to the terminal block of the watt-hour meter by fixing pins arranged at both ends. When the fixing pin is tightened, the plurality of contact pins are brought into contact with the terminals of the terminal block. However, since the fixing pins are arranged at both ends, there is a possibility that a force is not equally applied to each of the plurality of contact pins. For this reason, the contact failure between a contact pin and the terminal of a terminal block may arise.

  This invention is made | formed in view of the above, Comprising: It aims at providing the uninterruptible replacement tool which can suppress the contact failure between a contact pin and the terminal of a terminal block.

  In order to solve the above-described problems and achieve the object, an uninterruptible replacement tool according to one aspect of the present invention includes a charging terminal that is a charging unit, and a non-charging terminal that is not a charging unit and has a female screw. An uninterruptible replacement tool attached to a terminal block of a watt-hour meter, protruding from the case, a fixing screw attached to the female screw, protruding from the case, and brought into contact with the surface of the charging terminal A contact pin.

  In the terminal block, the non-charging terminal is disposed between the charging terminal and the charging terminal. For this reason, the uninterruptible replacement tool is fixed to the terminal block by a fixing screw at a position between the charging terminal and the charging terminal. Thereby, it is easy to apply force equally to each of the plurality of contact pins. Therefore, the uninterruptible replacement tool can suppress contact failure between the terminal of the watt hour meter and the contact pin.

  As a desirable mode of the uninterruptible replacement tool, it is preferable that the position of the contact pin in the longitudinal direction of the charging terminal is shifted with respect to the position of the fixing screw in the longitudinal direction.

  Thereby, the position of the contact pin is shifted with respect to the female screw of the charging terminal. This makes it easier for the contact pin to face the surface of the charging terminal instead of the female screw. For this reason, poor contact between the contact pin and the charging terminal is suppressed.

  As a desirable aspect of the uninterruptible replacement tool, the case includes a plurality of cylindrical protrusions protruding toward the terminal block, and the fixing screw and the contact pin protrude from the cylindrical protrusion, respectively. Is preferred.

  Thereby, each cylindrical protrusion part fits into the recessed part in which a charging terminal and a non-charging terminal are arrange | positioned in a terminal block. For this reason, when attaching an uninterruptible replacement tool to a terminal block, positioning of the uninterruptible replacement tool is easy.

  ADVANTAGE OF THE INVENTION According to this invention, the uninterruptible replacement tool which can suppress the contact failure between a contact pin and the terminal of a terminal block can be provided.

FIG. 1 is a front view showing the watt-hour meter. FIG. 2 is a front view showing a terminal block of the watt-hour meter. FIG. 3 is a front view showing the uninterruptible replacement tool according to the present embodiment. FIG. 4 is a rear view showing the uninterruptible replacement tool according to the present embodiment. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a schematic diagram showing an electric circuit of the uninterruptible replacement tool according to the present embodiment. FIG. 7 is a cross-sectional view taken along line AA in FIG. 3 in a state where the uninterruptible replacement tool according to this embodiment is attached to the terminal block. FIG. 8 is a front view showing the uninterruptible replacement tool according to the first modification. FIG. 9 is a schematic diagram illustrating an electric circuit of the uninterruptible replacement tool according to the first modification. FIG. 10 is a front view showing the uninterruptible replacement tool according to the second modification. FIG. 11 is a schematic diagram illustrating an electric circuit of the uninterruptible replacement tool according to the second modification.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

(Embodiment)
FIG. 1 is a front view showing the watt-hour meter. The watt hour meter 100 is a device that measures the amount of electric power by integrating the electric power. The watt-hour meter 100 includes a communication device, for example, and can transmit the measured power amount as a digital signal. That is, the watt-hour meter 100 is a smart meter. The watt hour meter 100 is a smart meter having a rated current of 60A.

  In the following description, when the watt-hour meter 100 attached to the wall is viewed from the front, the left-right direction of the watt-hour meter 100 is the X direction, the depth direction of the watt-hour meter 100 is the Y direction, and the vertical direction is the Z direction. The XYZ rectangular coordinate system is used. In FIG. 1, the right direction is the + X direction, the direction from the front to the back of the paper is the + Y direction, and the upward direction is the + Z direction.

  As shown in FIG. 1, the watt-hour meter 100 includes a meter 1 that measures the amount of power and a terminal block 2 to which a plurality of meter wires 9 are connected. The instrument wiring 9 includes a power supply side wiring 9a, a power supply side wiring 9b, a power supply side wiring 9c, a load side wiring 9d, a load side wiring 9e, and a load side wiring 9f. The power supply side wiring 9 a, the power supply side wiring 9 b, the power supply side wiring 9 c, the load side wiring 9 d, the load side wiring 9 e and the load side wiring 9 f are inserted into the wire insertion holes 21 of the terminal block 2, respectively. It is fixed by.

  The power supply side wiring 9 a is connected to the load side wiring 9 f through the measuring instrument 1. The power supply side wiring 9c is connected to the load side wiring 9d through the measuring instrument 1. On the other hand, the power supply side wiring 9 b is connected to the load side wiring 9 e without going through the measuring instrument 1. The power supply side wiring 9b is grounded (grounded).

  FIG. 2 is a front view showing a terminal block of the watt-hour meter. As shown in FIG. 2, the terminal block 2 includes a charging terminal 3a, a non-charging terminal 4b, a charging terminal 3c, a charging terminal 3d, a non-charging terminal 4e, and a charging terminal 3f. The charging terminal 3a is connected to the power supply side wiring 9a and includes a female screw 31a. The non-charging terminal 4b is connected to the power supply side wiring 9b and includes a female screw 41b. The charging terminal 3c is connected to the power supply side wiring 9c and includes a female screw 31c. The charging terminal 3d is connected to the load side wiring 9d and includes a female screw 31d. The non-charging terminal 4e is connected to the load side wiring 9e and includes a female screw 41e. The charging terminal 3f is connected to the load side wiring 9f and includes a female screw 31f. The female screw 31a, the female screw 41b, the female screw 31c, the female screw 31d, the female screw 41e, and the female screw 31f have the same diameter D1.

  The charging terminal 3a, the charging terminal 3c, the charging terminal 3d, and the charging terminal 3f are charging units. The charged part means a part where a current flowing through the resistor is 1 mA or less when a 1 kΩ resistor is connected to the ground. On the other hand, since the power supply side wiring 9b is grounded, the non-charging terminal 4b and the non-charging terminal 4e are not charging parts.

  FIG. 3 is a front view showing the uninterruptible replacement tool according to the present embodiment. FIG. 4 is a rear view showing the uninterruptible replacement tool according to the present embodiment. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a schematic diagram showing an electric circuit of the uninterruptible replacement tool according to the present embodiment.

  The uninterruptible replacement tool 5 is a tool used when the meter 1 of the watt hour meter 100 is replaced without an uninterruptible power. The uninterruptible replacement tool 5 is attached so as to cover the front side of the terminal block 2 as shown in FIG. As shown in FIGS. 3 to 6, the uninterruptible replacement tool 5 includes a case 50, a fixing screw 60b, a fixing screw 60e, a contact pin 62a, a push screw 61a, an elastic member 63a, and a contact pin 62c. A contact pin 62d, a push screw 61cd, an elastic member 63cd, a contact pin 62f, a push screw 61f, an elastic member 63f, a bypass fitting 65, a current transformer 66, a bypass fitting 67, and a current transformer 68. A circuit board 70, a lamp 71, and a lamp 72.

  The case 50 is a hollow member formed of an insulator such as a synthetic resin. The case 50 includes a cylindrical protruding portion 51a, a cylindrical protruding portion 51b, a cylindrical protruding portion 51c, a cylindrical protruding portion 51d, a cylindrical protruding portion 51e, a cylindrical protruding portion 51f, and a case female screw 52b. And a case female screw 52e.

  As shown in FIGS. 4 and 5, the cylindrical protrusion 51 a to the cylindrical protrusion 51 f are, for example, cylindrical members, and protrude in the + Y direction from the back side of the case 50. That is, the cylindrical protrusion 51 f protrudes toward the terminal block 2 in a state where the uninterruptible replacement tool 5 is attached to the terminal block 2. As shown in FIG. 4, the cylindrical protrusion 51a, the cylindrical protrusion 51c, the cylindrical protrusion 51d, and the cylindrical protrusion 51f are arranged on the virtual straight line L1. The cylindrical protrusion 51b and the cylindrical protrusion 51e are arranged on the virtual straight line L2. The virtual straight line L2 is parallel to the virtual straight line L1, and is shifted in the Z direction with respect to the virtual straight line L1. A distance D2 from the virtual straight line L1 to the virtual straight line L2 is not less than the diameter D1 shown in FIG. Moreover, the case female screw 52b is arrange | positioned in the position which overlaps the cylindrical protrusion part 51b in the Y direction, as shown in FIG. The case female screw 52e is disposed at a position overlapping the cylindrical protrusion 51e in the Y direction.

  The fixing screw 60b and the fixing screw 60e are members for connecting the uninterruptible replacement tool 5 and the terminal block 2 and are made of, for example, steel. The fixing screw 60b meshes with the case female screw 52b and penetrates the case female screw 52b. The fixing screw 60e meshes with the case female screw 52e and passes through the case female screw 52e.

  The fixing screw 60b and the fixing screw 60e are protruded to the rear side of the case 50 by being rotated clockwise from the front side of the case 50 by a tool such as a screwdriver. Further, as shown in FIG. 5, the length L1 from the head of the fixing screw 60b and the fixing screw 60e to the tip is smaller than the length L2 from the front surface of the case 50 to the tip of the cylindrical protrusion 51a. For this reason, the fixing screw 60b and the fixing screw 60e do not protrude from the case 50 by adjusting the positions of the fixing screw 60b and the fixing screw 60e.

  The contact pin 62a is a member that contacts the surface of the charging terminal 3a, and is made of, for example, copper. The contact pin 62a includes a small-diameter portion at the end portion in the −Y direction similarly to the contact pin 62c and the contact pin 62d described later. The small diameter portion of the contact pin 62 a passes through the bypass fitting 65. The contact pin 62 a is fixed to the bypass metal fitting 65 by crimping the small diameter portion of the contact pin 62 a. The bypass metal fitting 65 has a bypass tool female screw 651a. The push screw 61a meshes with the bypass tool female screw 651a. As shown in FIG. 6, the position of the push screw 61a in the Z direction is deviated from the position of the contact pin 62a in the Z direction. The head of the push screw 61 a is in contact with the outer surface of the case 50. The elastic member 63a is, for example, a compression coil spring. The push screw 61a passes through the elastic member 63a. One end of the elastic member 63 a is joined to the inner wall of the case 50, and the other end of the elastic member 63 a is joined to the bypass fitting 65. For this reason, even if the pushing screw 61a rotates, the bypass metal fitting 65 and the contact pin 62a do not rotate.

  The push screw 61a is removed from the bypass tool female screw 651a by being rotated counterclockwise by a tool such as a screwdriver from the front side of the case 50. That is, when the push screw 61a is rotated counterclockwise, the bypass fitting 65 and the contact pin 62a move in the + Y direction. Further, as shown in FIG. 5, the minimum length L1 from the head of the push screw 61a to the tip of the contact pin 62a is smaller than the length L2. For this reason, when the contact pin 62 a is positioned closest to the −Y direction, the push screw 61 a and the contact pin 62 a do not protrude from the case 50.

  The contact pin 62c is a member that contacts the surface of the charging terminal 3c, and is made of, for example, copper. The contact pin 62d is a member that contacts the surface of the charging terminal 3d, and is made of, for example, copper. The contact pin 62 c and the contact pin 62 d are connected by a bypass metal fitting 67. The contact pin 62c includes a small diameter portion 622c at an end portion in the −Y direction, and the contact pin 62d includes a small diameter portion 622d at an end portion in the −Y direction. The small diameter portion 622 c and the small diameter portion 622 d penetrate the bypass tool 67. The contact pin 62c and the contact pin 62d are fixed to the bypass metal fitting 67 by crimping the small diameter portion 622c and the small diameter portion 622d. As shown in FIG. 5, the push screw 61 cd passes through the bypass tool female screw 671 provided in the bypass tool 67 and meshes with the bypass tool female screw 671. The head of the push screw 61 cd is in contact with the outer surface of the case 50. The elastic member 63cd is, for example, a compression coil spring. The push screw 61cd passes through the elastic member 63cd. One end of the elastic member 63cd is joined to the inner wall of the case 50, and the other end of the elastic member 63cd is joined to the bypass tool 67. For this reason, even if the pushing screw 61cd rotates, the bypass tool 67, the contact pin 62c, and the contact pin 62d do not rotate.

  The pushing screw 61cd is removed from the bypass tool female screw 671 by being rotated counterclockwise by a tool such as a screwdriver from the front side of the case 50. That is, when the push screw 61cd is rotated counterclockwise, the contact pin 62c and the contact pin 62d move in the + Y direction. When the push screw 61cd is rotated clockwise, the contact pin 62c and the contact pin 62d are in the -Y direction, and the small diameter portion 622c and the small diameter portion 622d are in contact with the case 50. Thereby, the movable range of the contact pin 62c and the contact pin 62d is regulated. As shown in FIG. 5, when the small diameter portion 622c and the small diameter portion 622d are in contact with the case 50, the length L1 from the head of the push screw 61cd to the tip of the contact pin 62c (contact pin 62d) is the length L2. Smaller than. For this reason, when the contact pin 62c and the contact pin 62d are positioned closest to the −Y direction, the push screw 61cd, the contact pin 62c, and the contact pin 62d do not protrude from the case 50.

  The contact pin 62f is a member that contacts the surface of the charging terminal 3f, and is made of, for example, copper. Similar to the contact pin 62c and the contact pin 62d, the contact pin 62f includes a small diameter portion at the end portion in the −Y direction. The small diameter portion of the contact pin 62 f passes through the bypass fitting 65. The contact pin 62f is fixed to the bypass metal fitting 65 by crimping the small diameter portion of the contact pin 62f. The bypass metal fitting 65 has a bypass tool female screw 651f. The push screw 61f meshes with the bypass tool female screw 651f. As shown in FIG. 6, the position of the push screw 61f in the Z direction is deviated from the position of the contact pin 62f in the Z direction. The head of the push screw 61 f is in contact with the outer surface of the case 50. The elastic member 63f is, for example, a compression coil spring. The push screw 61f passes through the elastic member 63f. One end of the elastic member 63f is joined to the inner wall of the case 50, and the other end of the elastic member 63f is joined to the bypass fitting 65. For this reason, even if the pressing screw 61f rotates, the bypass fitting 65 and the contact pin 62f do not rotate.

  The pushing screw 61f is removed from the bypass tool female screw 651f by being rotated counterclockwise by a tool such as a screwdriver from the front side of the case 50. That is, when the pressing screw 61f is rotated counterclockwise, the bypass fitting 65 and the contact pin 62f move in the + Y direction. Further, as shown in FIG. 5, the minimum length L1 from the head of the push screw 61f to the tip of the contact pin 62f is smaller than the length L2. For this reason, when the contact pin 62 f is positioned closest to the −Y direction, the push screw 61 f and the contact pin 62 f do not protrude from the case 50.

  The bypass metal fitting 65 is a member for connecting the contact pin 62a and the contact pin 62f, and is made of, for example, copper. As shown in FIG. 6, the bypass fitting 65 is substantially U-shaped and bypasses the bypass fitting 67. When the contact pin 62a contacts the charging terminal 3a and the contact pin 62f contacts the charging terminal 3f, a current flows from the contact pin 62a to the contact pin 62f via the bypass fitting 65.

  The current transformer 66 is a device for converting the magnitude of the current. The current transformer 66 is connected to the circuit board 70. As shown in FIG. 5, the contact pin 62 a passes through the current transformer 66. When a current flows from the contact pin 62a to the contact pin 62f, the current transformer 66 sends a current reduced at a predetermined ratio to the circuit board 70.

  The bypass metal fitting 67 is a member for connecting the contact pin 62c and the contact pin 62d, and is made of, for example, copper. When the contact pin 62c contacts the charging terminal 3c and the contact pin 62d contacts the charging terminal 3d, a current flows from the contact pin 62c to the contact pin 62d via the bypass fitting 67.

  The current transformer 68 is a device for converting the magnitude of the current. The current transformer 68 is connected to the circuit board 70. As shown in FIG. 5, the contact pin 62 d passes through the current transformer 68. When a current flows from the contact pin 62c to the contact pin 62d, the current transformer 68 sends a current reduced at a predetermined ratio to the circuit board 70.

  The circuit board 70 is a board on which an electric circuit for lighting the lamp 71 and the lamp 72 is arranged. The lamp 71 and the lamp 72 are, for example, LED lamps. The lamp 71 is lit when a current flows from the contact pin 62a to the contact pin 62f. The lamp 72 is turned on when a current flows from the contact pin 62c to the contact pin 62d.

  FIG. 7 is a cross-sectional view taken along line AA in FIG. 3 in a state where the uninterruptible replacement tool according to this embodiment is attached to the terminal block. When the uninterruptible replacement tool 5 is attached to the terminal block 2, the uninterruptible replacement tool 5 is first positioned. Specifically, as shown in FIG. 7, the cylindrical protrusion 51a is fitted in the recess 25a in which the charging terminal 3a is arranged, and the cylindrical protrusion 51b is fitted in the recess 25b in which the non-charging terminal 4b is arranged. The cylindrical protrusion 51c is fitted in the recess 25c in which the charging terminal 3c is disposed, the cylindrical protrusion 51d is fitted in the recess 25d in which the charging terminal 3d is disposed, and the recess 25e in which the non-charging terminal 4e is disposed. The cylindrical protrusion 51e is fitted, and the cylindrical protrusion 51f is fitted in the recess 25f in which the charging terminal 3f is disposed. More specifically, the position of the uninterruptible replacement tool 5 is such that the cylindrical protrusion 51b overlaps the female screw 41b of the non-charging terminal 4b and the cylindrical protrusion 51e overlaps the female screw 41e of the non-charging terminal 4e. Is adjusted. Positioning is easy by the cylindrical projection 51a, the cylindrical projection 51b, the cylindrical projection 51c, the cylindrical projection 51d, the cylindrical projection 51e, and the cylindrical projection 51f.

  After the positioning, the fixing screw 60b and the fixing screw 60e are rotated. The fixing screw 60b protruding from the case 50 meshes with the female screw 41b of the non-charging terminal 4b as shown in FIG. The fixing screw 60e protruding from the case 50 meshes with the female screw 41e of the non-charging terminal 4e. Thereby, the uninterruptible replacement tool 5 is fixed to the terminal block 2. Since the non-charging terminal 4b and the non-charging terminal 4e are not charging parts as described above, an electric shock of an operator during the work of attaching the uninterruptible replacement tool 5 is prevented.

  After the uninterruptible replacement tool 5 is fixed to the terminal block 2, the push screw 61a, the push screw 61cd, and the push screw 61f are rotated. Thereby, as shown in FIG. 7, the contact pin 62a protrudes from the cylindrical protrusion part 51a, and contacts the charging terminal 3a. The contact pin 62c protrudes from the cylindrical protrusion 51c and contacts the charging terminal 3c. The contact pin 62d protrudes from the cylindrical protrusion 51d and contacts the charging terminal 3d. The contact pin 62f protrudes from the cylindrical protrusion 51f and contacts the charging terminal 3f.

  When the contact pin 62a contacts the charging terminal 3a and the contact pin 62f contacts the charging terminal 3f, a current flows from the contact pin 62a to the contact pin 62f. At this time, since the lamp 71 is lit, the operator can confirm that the power supply side wiring 9a and the load side wiring 9f shown in FIG. 1 are connected. When the contact pin 62c contacts the charging terminal 3c and the contact pin 62d contacts the charging terminal 3d, a current flows from the contact pin 62c to the contact pin 62d. At this time, since the lamp 72 is lit, the operator can confirm that the power supply side wiring 9c and the load side wiring 9d shown in FIG. 1 are connected. Moreover, since the contact pin 62a, the contact pin 62c, the contact pin 62d, the contact pin 62f, the bypass fitting 65, and the bypass fitting 67 are formed of copper, heat generation is suppressed.

  The push screw 61a moves (retracts) in the -Y direction when it is rotated clockwise as in the case of tightening a normal screw. For this reason, inadvertent contact of the contact pin 62a with the charging terminal 3a is prevented. Further, a force in the + Y direction is applied to the contact pin 62a by the elastic member 63a. Thereby, the state in which the contact pin 62a is in contact with the charging terminal 3a is easily maintained. That is, poor contact between the contact pin 62a and the charging terminal 3a is unlikely to occur. Furthermore, even if the elastic force of the elastic member 63a is weakened due to secular change, the force in the + Y direction applied to the contact pin 62a can be adjusted by the push screw 61a. For this reason, the uninterruptible replacement tool 5 can be used regardless of the elastic force of the elastic member 63a. These descriptions can also be applied to the push screw 61cd and the push screw 61f.

  The contact pin 62a, the contact pin 62c, the contact pin 62d, and the contact pin 62f are not necessarily moved by the push screw 61a, the push screw 61cd, and the push screw 61f, respectively. For example, the contact pin 62a, the contact pin 62c, the contact pin 62d, and the contact pin 62f may mesh with a case female screw provided in the case 50, similarly to the fixing screw 60b and the fixing screw 60e. In such a case, the contact pin 62a, the contact pin 62c, the contact pin 62d, and the contact pin 62f are directly operated with a tool such as a screwdriver.

  Note that the contact pin 62c and the contact pin 62d are not necessarily moved simultaneously by the push screw 61cd. For example, the contact pin 62c and the contact pin 62d may be moved by separate push screws. That is, instead of the push screw 61cd, a push screw for moving the contact pin 62c and a push screw for moving the contact pin 62d may be provided.

  The uninterruptible replacement tool 5 does not necessarily include the elastic member 63a, the elastic member 63cd, and the elastic member 63f. Further, the lamp 71 and the lamp 72 are not necessarily LED lamps, and may be halogen lamps, fluorescent lamps, or the like. Further, the lamp 71 and the lamp 72 may be omitted.

  As described above, the uninterruptible replacement tool 5 is a charging terminal (charging terminal 3a, charging terminal 3c, charging terminal 3d, and charging terminal 3f) that is a charging unit, and a non-charging unit that has a female screw. It is a tool attached to the terminal block 2 of the watt-hour meter 100 provided with a charging terminal (the non-charging terminal 4b and the non-charging terminal 4e). The uninterruptible replacement tool 5 includes a case 50, a fixing screw (fixing screw 60b and fixing screw 60e) that protrudes from the case 50 and is attached to the female screw (the female screw 41b and the female screw 41e), and a charging terminal ( Contact pins (contact pins 62a, contact pins 62c, contact pins 62d, and contact pins 62f) that are brought into contact with the surfaces of the charging terminals 3a, charging terminals 3c, charging terminals 3d, and charging terminals 3f).

  In the terminal block 2, the non-charging terminal is arranged between the charging terminal and the charging terminal. For this reason, the uninterruptible replacement tool 5 is fixed to the terminal block 2 by the fixing screws (fixing screw 60b and fixing screw 60e) at a position between the charging terminal and the charging terminal. Thereby, it is easy to apply force equally to each of the plurality of contact pins (contact pin 62a, contact pin 62c, contact pin 62d, and contact pin 62f). Therefore, the uninterruptible replacement tool 5 can suppress contact failure between the contact pins and the terminals of the terminal block 2.

  In the uninterruptible replacement tool 5, the position of the contact pins (contact pin 62a, contact pin 62c, contact pin 62d, and contact pin 62f) in the longitudinal direction (Z direction) of the charging terminal is the longitudinal direction (Z direction) of the charging terminal. ) With respect to the positions of the fixing screws (fixing screw 60b and fixing screw 60e). More specifically, as described above, the distance D2 (see FIG. 4) is not less than the diameter D1 (see FIG. 2).

  Thereby, the position of the contact pin (contact pin 62a, contact pin 62c, contact pin 62d and contact pin 62f) is relative to the female screw (female screw 31a, female screw 31c, female screw 31d and female screw 31f) of the charging terminal. Shift. This makes it easier for the contact pin to face the surface of the charging terminal instead of the female screw. For this reason, poor contact between the contact pin and the charging terminal is suppressed.

  In the uninterruptible replacement tool 5, the case 50 includes a plurality of cylindrical protrusions (a cylindrical protrusion 51a, a cylindrical protrusion 51b, a cylindrical protrusion 51c, and a cylindrical protrusion) protruding toward the terminal block 2. 51d, a cylindrical protrusion 51e, and a cylindrical protrusion 51f). The fixing screw (fixing screw 60b and fixing screw 60e) and the contact pin (contact pin 62a, contact pin 62c, contact pin 62d and contact pin 62f) are respectively cylindrical protrusions (cylindrical protrusion 51a and cylindrical protrusion 51b). , The cylindrical protruding portion 51c, the cylindrical protruding portion 51d, the cylindrical protruding portion 51e, and the cylindrical protruding portion 51f).

  Thereby, each cylindrical protrusion fits into the concave portions (the concave portions 25a, the concave portions 25b, the concave portions 25c, the concave portions 25c, the concave portions 25e, and the concave portions 25f) in which the charging terminals and the non-charging terminals are arranged in the terminal block 2. For this reason, positioning of the uninterruptible replacement tool 5 when the uninterruptible replacement tool 5 is attached to the terminal block 2 is easy.

(Modification 1)
FIG. 8 is a front view showing the uninterruptible replacement tool according to the first modification. FIG. 9 is a schematic diagram illustrating an electric circuit of the uninterruptible replacement tool according to the first modification. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The uninterruptible replacement tool 5A according to the first modification is used for a watt hour meter having a rated current of 30A. The watt-hour meter with a rated current of 30 A includes two charging terminals and two non-charging terminals. In the X direction, the charging terminal, the non-charging terminal, the non-charging terminal, and the charging terminal are arranged in this order. Moreover, the internal terminal is provided in the charge terminal and the non-charge terminal similarly to embodiment mentioned above.

  The case 50A includes four cylindrical protrusions corresponding to the contact pin 62aA, the fixing screw 60bA, the fixing screw 60cA, and the contact pin 62dA. The fixing screw 60bA and the fixing screw 60cA protrude from the front side of the case 50A to the back side of the case 50A by being rotated clockwise by a tool such as a screwdriver.

  The push screw 61aA meshes with a bypass tool female screw provided in the bypass fitting 65A. As shown in FIG. 9, the position of the push screw 61aA in the Z direction is deviated from the position of the contact pin 62aA in the Z direction. The contact pin 62aA is joined to the case 50A via an elastic member as in the above-described embodiment. When the push screw 61aA is rotated counterclockwise, the contact pin 62aA moves in the + Y direction.

  The push screw 61dA meshes with a bypass tool female screw provided on the bypass fitting 65A. As shown in FIG. 9, the position of the push screw 61dA in the Z direction is shifted from the position of the contact pin 62dA in the Z direction. The contact pin 62dA is joined to the case 50A via an elastic member as in the above-described embodiment. When the push screw 61dA is rotated counterclockwise, the contact pin 62dA moves in the + Y direction.

  The bypass metal fitting 65 </ b> A includes a metal piece 651, a metal piece 652, and a bridge 653. The metal piece 651 is connected to the contact pin 62aA. The metal piece 652 is connected to the contact pin 62dA. The bridge 653 connects the metal piece 651 and the metal piece 652. When the contact pin 62aA and the contact pin 62dA come into contact with the charging terminal, a current flows from the contact pin 62aA to the contact pin 62dA via the bypass fitting 65A.

  The current transformer 66A is connected to the circuit board 70A. As shown in FIG. 9, a bridge 653 passes through the current transformer 66A. When a current flows from the contact pin 62aA to the contact pin 62dA, the current transformer 66A sends a current reduced at a predetermined ratio to the circuit board 70A.

  The circuit board 70A is a board on which an electric circuit for lighting the lamp 71A is arranged. The lamp 71A is, for example, an LED lamp. The lamp 71A is turned on when a current flows from the contact pin 62aA to the contact pin 62dA.

(Modification 2)
FIG. 10 is a front view showing the uninterruptible replacement tool according to the second modification. FIG. 11 is a schematic diagram illustrating an electric circuit of the uninterruptible replacement tool according to the second modification. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The uninterruptible replacement tool 5B according to Modification 2 is used for a watt hour meter having a rated current of 120A. The watt-hour meter with a rated current of 120 A includes four charging terminals and two non-charging terminals. In the X direction, the charging terminal, the non-charging terminal, the charging terminal, the charging terminal, the non-charging terminal, and the charging terminal are arranged in this order. Moreover, the internal terminal is provided in the charge terminal and the non-charge terminal similarly to embodiment mentioned above.

  The case 50B includes six cylindrical protrusions corresponding to the contact pin 62aB, the fixing screw 60bB, the contact pin 62cB, the contact pin 60dB, the fixing screw 60eB, and the contact pin 62fB. The fixing screw 60bB and the fixing screw 60eB protrude to the back side of the case 50B by being rotated clockwise from the front side of the case 50B by a tool such as a screwdriver.

  The push screw 61aB meshes with a bypass tool female screw provided on the bypass fitting 65B. As shown in FIG. 11, the position of the push screw 61aB in the Z direction is deviated from the position of the contact pin 62aB in the Z direction. The contact pin 62aB is joined to the case 50B via an elastic member as in the above-described embodiment. When the push screw 61aB is rotated counterclockwise, the contact pin 62aB moves in the + Y direction.

  The contact pin 62cB and the contact pin 62dB are connected by a bypass fitting 67B. A small diameter portion 622cB provided on the contact pin 62cB and a small diameter portion 622dB provided on the contact pin 62dB penetrate the bypass fitting 67B. The push screw 61cdB passes through a bypass tool female screw provided in the bypass fitting 67B and meshes with the bypass tool female screw. The bypass metal fitting 67B is joined to the case 50B via an elastic member as in the above-described embodiment. When the push screw 61cdB is rotated counterclockwise, the contact pin 62cB and the contact pin 62dB move in the + Y direction.

  The push screw 61fB meshes with a bypass tool female screw provided on the bypass fitting 65B. As shown in FIG. 11, the position of the push screw 61fB in the Z direction is deviated from the position of the contact pin 62fB in the Z direction. The contact pin 62fB is joined to the case 50B via an elastic member as in the above-described embodiment. When the push screw 61fB is rotated counterclockwise, the contact pin 62fB moves in the + Y direction.

  As shown in FIG. 11, the bypass fitting 65B is substantially U-shaped and bypasses the bypass fitting 67B. When the contact pin 62aB and the contact pin 62fB come into contact with the charging terminal, a current flows from the contact pin 62aB to the contact pin 62fB via the bypass fitting 65B.

  The current transformer 66B is connected to the circuit board 70B. As shown in FIG. 11, the contact pin 62aB passes through the current transformer 66B. When a current flows from the contact pin 62aB to the contact pin 62fB, the current transformer 66B sends a current reduced at a predetermined ratio to the circuit board 70B.

  When the contact pin 62cB and the contact pin 62dB come into contact with the charging terminal, a current flows from the contact pin 62cB to the contact pin 62dB via the bypass fitting 67B.

  The current transformer 68B is connected to the circuit board 70B. As shown in FIG. 11, the contact pin 62cB passes through the current transformer 68B. When a current flows from the contact pin 62cB to the contact pin 62dB, the current transformer 68B sends a current reduced at a predetermined ratio to the circuit board 70B.

  The circuit board 70B is a board on which an electric circuit for lighting the lamp 71B and the lamp 72B is arranged. The lamp 71B and the lamp 72B are, for example, LED lamps. The lamp 71B is turned on when a current flows from the contact pin 62aB to the contact pin 62fB. The lamp 72B is turned on when a current flows from the contact pin 62cB to the contact pin 62dB.

DESCRIPTION OF SYMBOLS 1 Meter 100 Electricity meter 2 Terminal block 21 Electric wire insertion hole 22 Terminal screw 25a, 25b, 25c, 25d, 25e, 25f Recessed part 3a, 3c, 3d, 3f Charging terminal 31a, 31c, 31d, 31f Female screw 4b, 4e Non-charging terminal 41b, 41e Female screw 5, 5A, 5B Uninterruptible replacement tool 50, 50A, 50B Case 51a, 51b, 51c, 51d, 51e, 51f Cylindrical protrusion 52b, 52e Case female screw 60b, 60e, 60bA , 60cA, 60bB, 60eB Fixing screw 61a, 61cd, 61f, 61aA, 61dA, 61aB, 61cdB, 61fB Pushing screw 62a, 62c, 62d, 62f, 62aA, 62dA, 62aB, 62cB, 62dB, 62fB Small diameter Part 63a, 63cd, 63f elastic member 65, 67, 65A, 65B, 67B Bypass bracket 651, 652 Bracket pieces 651a, 651f Bypass tool female screw 653 Bridge 66, 68, 66A, 66B, 68B Current transformer 671 Bypass tool female screw 70 Circuit boards 71, 72, 71A, 71B, 72B Lamp 9 Instrument wiring 9a, 9b, 9c Power supply side wiring 9d, 9e, 9f Load side wiring

Claims (3)

An uninterruptible replacement tool attached to a terminal block of a watt hour meter having a charging terminal that is a charging unit and a non-charging terminal that has a female screw instead of a charging unit,
Case and
A fixing screw protruding from the case and attached to the female screw;
A contact pin protruding from the case and brought into contact with the surface of the charging terminal;
Uninterruptible replacement tool with The uninterruptible replacement tool according to claim 1, wherein a position of the contact pin in a longitudinal direction of the charging terminal is shifted with respect to a position of the fixing screw in the longitudinal direction. The case includes a plurality of cylindrical protrusions protruding toward the terminal block,
The uninterruptible replacement tool according to claim 1, wherein the fixing screw and the contact pin protrude from the cylindrical protrusion.

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