Check terminal structure and check terminal

Abstract

To provide a check terminal structure inhibiting conduction failure of a pair of terminal strips and a contact plug from being removed even when the contact plug is repeatedly attached and detached in a gap between the terminal strips.SOLUTION: A check terminal structure 1 comprises a first terminal strip 3, a second terminal strip 4, and a contact plug 6 provided in a gap 5 therebetween. The contact plug 6 includes: a main shaft conductor 61 composed of conductive metallic material; a pair of sealing pin 62 provided on a lower end of the main shaft conductor 61; a tab 63 provided on an upper end of the main shaft conductor 61; and a coil spring 64 provided on the upper end of the main shaft conductor 61. On other ends of the first terminal strip 3 and the second terminal strip 4 are formed a groove part coincident in shape with a peripheral side face of the main shaft conductor 61, a slit 36 through which the sealing pins 62 pass when the main shaft conductor 61 is rotated around a center axis T, and a fitting recess 37 temporarily storing the sealing pins 62 within the slit 36.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a terminal structure of a check terminal connected between a transformer provided on the power supplier side such as an electric power company and an electric power meter (high-voltage meter) provided on the power consumer side, and a check terminal including the same.

Background Art

[0002] Conventionally, a high-voltage power receiving facility is provided with an electric power meter (high-voltage meter) for measuring the amount of electric power. Inside the high-voltage power receiving facility, a check terminal is installed that is connected between a transformer provided on the power supplier side such as an electric power company and an electric power meter provided on the power consumer side. An electric power meter is obliged to be replaced every predetermined period according to the Measurement Act. When replacing the electric power meter, in order to prevent a non-measurement state or the like from occurring during the replacement work, the old electric power meter is replaced with a new electric power meter while an alternative meter is temporarily attached to the check terminal.

[0003] Here, a conventional check terminal will be described with reference to FIGS. 8 to 12B. FIG. 8 is a plan view showing a conventional check terminal. FIG. 9 is a cross-sectional view of the conventional check terminal shown in FIG. 8 cut along line B-B. As shown in FIG. 8, a conventional check terminal 200 includes an outer box 201 and seven check terminal structures 212 provided inside the outer box 201.

[0004] As shown in FIGS. 8 and 9, the check terminal structure 212 accommodated in the outer box 201 is configured to be able to connect a transformer lead wire 216 from a transformer (not shown), an electric power meter lead wire 221 from an electric power meter (not shown), and an alternative meter lead wire 229 as a lead wire from an alternative meter (not shown). More specifically, as shown in FIG. 9, the check terminal structure 212 includes a substrate 213, a pair of terminal plates 214 and 214' each having a gap 214c at the central portion, a transformer terminal portion 215, a power meter terminal portion 220, an alternative meter terminal portion 226, and a plug 230 interposed in the gap 214c to electrically connect the pair of terminal plates 214 and 214'.

[0005] As shown in FIGS. 8 and 9, the substrate 213 is configured as a rectangular plate-like member made of an insulating material. Further, the substrate 213 is used as a base for fixing each check terminal structure 212. Furthermore, the substrate 213 is fixed inside the outer box 201 by screws (not shown). In the following description, as shown in FIG. 8, the short side direction in which the horizontal side of the substrate 213 extends is defined as the "X direction", the long side direction in which the vertical side of the substrate 13 extends is defined as the "Y direction", and the thickness direction of the substrate 13 (the direction perpendicular to the plane of FIG. 1) is defined as the "Z direction".

[0006] As shown in FIG. 9, the terminal plates 214 and 214' are made of a conductive metal material and are configured in a rectangular parallelepiped shape elongated in the X direction. Also, as shown in FIG. 9, the terminal plates 214 and 214' are divided by a gap 214c formed at the central portion in the X direction. One end of the terminal plate 214 on the side where the gap 214c is not formed has a connection portion (such as a screw) for connecting the transformer lead wire 216. Also, one end of the terminal plate 214' on the side where the gap 214c is not formed has a connection portion (such as a screw) for connecting the power meter lead wire 221. Furthermore, between the other end of the terminal plate 214 on the side where the gap 214c is formed and the above-mentioned one end, there is an alternative meter terminal portion 226a (226) for connecting the alternative meter lead wire 229. In addition, between the other end of the terminal plate 214' on the side where the gap 214c is formed and the above-mentioned one end, there is also an alternative meter terminal portion 226b (226) for connecting another alternative meter lead wire 229.

[0007] Also, the plug 230 that connects the pair of terminal plates 214, 214' constituting the check terminal terminal structure 212 has a metal main shaft conductor 231 inserted into the gap 214c, and a pair of latching pins 232 (made of metal) protruding on the circumferential side surface of the lower end side of the main shaft conductor 231 and in a direction orthogonal to the axis U of the main shaft conductor 231, and an operating knob 233 (made of an insulating material such as resin) provided on the upper end side of the main shaft conductor 231. And the plug 230 electrically connects the pair of terminal plates 214, 214' by being screwed into the gap 214c between the pair of terminal plates 214, 214'.

[0008] Here, with reference to FIGS. 10A to 12B, the mechanism by which the pair of terminal plates 214, 214' constituting the check terminal terminal structure 212 are electrically connected by the plug 230 will be described. FIG. 10A is a side view seen from the Y direction of the state before inserting the plug into the gap between the pair of terminal plates, and FIG. 10B is a view seen from the direction of line Q1-Q1 in FIG. 10A. FIG. 11A is a side view seen from the Y direction of the state where the plug is inserted into the gap between the pair of terminal plates, and FIG. 11B is a cross-sectional view taken along line Q2-Q2 in FIG. 11A. FIG. 12A is a side view seen from the Y direction of the state where the plug inserted into the gap between the pair of terminal plates is rotated 45° about its axis U, and FIG. 12B is a cross-sectional view taken along line Q3-Q3 in FIG. 12A. Note that in FIG. 10A, the side view of the plug 230 (left side of the paper) and the side view of the state where the plug 230 is rotated 90° about its axis U (right side of the paper) are shown together. Furthermore, in FIGS. 11A and 12A, for easy understanding of the state of the plug 230 inserted into the gap 214c between the pair of terminal plates 214, 214', the cross-section of the plug 230 is shown on the left side of the paper with respect to the axis U of the plug 230, and the side view of the plug 230 is shown on the right side of the paper with respect to the same axis U.

[0009] As shown in FIG. 10A, the body portion 231c of the spindle conductor 231 has a diameter in the vertical cross section with respect to its axis U that decreases from the upper end 231a side toward the lower end 231b side. Also, as shown in FIGS. 10A and 10B, the other end 214 of the terminal plate 214 α and the other end 214' of the terminal plate 214' α each have a groove portion 243 having a contact surface 242 (= inner surface) that conforms to the circumferential side surface of the body portion 231c of the spindle conductor 231 formed in the Z direction when the spindle conductor 231 of the plug 230 is screwed into the gap 214c between them. Furthermore, as shown in FIG. 10A, the other end 214 of the terminal plate 214 that forms the gap 214c α on the substrate 213 side and the other end 214' of the terminal plate 214' α on the substrate 213 side each have a slit 240 formed to allow the latching pin 232 to pass from one side surface (the front side of the paper surface in FIG. 10A) of the terminal plates 214, 214' to the other side surface (the back side of the paper surface in FIG. 10A) when the plug 230 is inserted into the gap 214c. In addition, as shown in FIGS. 10A and 10B, on the vertical upper side surface (= top surface) of each slit 240, a protrusion 241 is formed along the curved shape of the contact surface 242 and protruding toward the vertical lower side (substrate 213 side). Also, as shown in FIGS. 10A and 10B, on the surface (= upper surface) of the substrate 213 directly below the gap 214c, a recess 213a for accommodating the lower end 231b side of the spindle conductor 231 is formed when the plug 230 is inserted into the gap 214c.

[0010] And FIGS. 11A and 11B show the state in which the spindle conductor 231 of the plug 230 is inserted into the gap 214c between the pair of terminal plates 214, 214', more specifically, between the groove portion 243 formed on the end surface of the terminal plate 214 and the groove portion 243 formed on the end surface of the terminal plate 214'. That is, the spindle conductor 231 of the plug 230 is inserted into the gap 214c from the upper surface side of the pair of terminal plates 214, 214' toward the substrate 213. At this time, so as not to prevent the insertion of the spindle conductor 231 between the pair of groove portions 243, the pair of latching pins 232 protruding from the spindle conductor 231 are both inserted in a state of being arranged on the side surface side (Y direction in FIGS. 11A and 11B) of the pair of terminal plates 214, 214'.

[0011] Furthermore, FIGS. 12A and 12B show a state in which the spindle conductor 231 of the plug 230 inserted between the pair of groove portions 243 is rotated 45° in the clockwise direction about its axis U as a base axis. When the spindle conductor 231 of the plug 230 is rotated 45° in the clockwise direction (the direction indicated by the symbol D in FIGS. 11A and 11B) about its axis U as a base axis from the state shown in FIGS. 11A and 11B, the pair of latching pins 232 arranged in the gap 214c between the pair of terminal plates 214, 214' enter and move into the slit 240. At this time, the latching pin 232 contacts the protrusion 241 protruding above the slit 240 in the vertical direction (see FIG. 12A), and the spindle conductor 231 of the plug 230 is strongly pulled toward the substrate 213 side (see the direction indicated by the symbol C in FIG. 12A). As a result, the circumferential side surface of the body portion 231c of the spindle conductor 231 of the plug 230 and the contact surface 242 of the groove portion 243 formed in the pair of terminal plates 214, 214' are in close contact. As a result, the pair of terminal plates 214, 214' are electrically connected by the spindle conductor 231 of the plug 230.

[0012] That is, in the check terminal structure 212 of the conventional check terminal 200, the combination of the pair of groove portions 243, the slit 240, and the protrusion 241 formed in the gap 214c between the pair of terminal plates 214, 214' functions as a female screw, and the combination of the spindle conductor 231 and the latching pin 232 in the plug 230 functions as a male screw, and the conduction state of the pair of terminal plates 214, 214' and its release can be switched by inserting and removing the plug 230.

[0013] Although no prior applications having the same problems to be solved as the present invention have been found at present, prior applications belonging to the same technical field as the present invention include, for example, "Check Terminal and Method for Measuring Electric Power Using the Same" (Japanese Patent Application Laid-Open No. 2007-132850; Patent Document 1) and "Check Terminal Terminal Cover" (Japanese Patent Application Laid-Open No. 2020-149861; Patent Document 2) by the same applicant as the applicant of the present invention.

Prior Art Documents

Patent Documents

[0014]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0015] In the conventional check terminal terminal structure 212 shown in FIGS. 10A to 12B, when the rotation operation of the plug 230 (refer to the direction indicated by the reference symbol D in FIGS. 11A and 11B) is repeated, the ridge 241 in the slit 240 and the contact portion (both are metals) of the latching pin 232 of the plug 230 are gradually worn, and the force (refer to the reference symbol C in FIG. 12A) for pulling the main shaft conductor 231 of the plug 230 toward the substrate 213 side as shown in FIG. 12A is not sufficiently exerted. That is, the contact surface 242 of the pair of groove portions 243 formed in the pair of terminal plates 214, 214' and the circumferential side surface of the main shaft conductor 231 of the plug 230 cannot be sufficiently brought into close contact, and finally the conductivity of the pair of terminal plates 214, 214' in the check terminal terminal structure 212 cannot be ensured. Furthermore, since the plug 230 is likely to come off from the gap 214c between the pair of terminal plates 214, 214', there is a high risk that the plug 230 will accidentally come off during the use of the check terminal terminal structure 212 and the conduction state of the pair of terminal plates 214, 214' will be interrupted, and there has been a concern that the conventional check terminal 200 will not perform its intended function. In this case, if wear on the surface of the locking pin 232 of the connector plug 230 is the main cause of poor conductivity between the pair of terminal plates 214, 214', it may be possible to continue using the check terminal 200 by replacing the connector plug 230. However, due to inevitable dimensional errors in the replacement connector plug 230 or slight differences in its conductivity from the previously used connector plug 230, there was a concern that problems would occur during power measurement or testing. Also, if wear on the ridges 241 formed on the pair of terminal plates 214, 214' is the main cause of poor conductivity between the pair of terminal plates 214, 214', it is necessary to replace the entire check terminal 200 even if there are no defects in other check terminal structures 212 other than the check terminal structure 212 of the pair of terminal plates 214, 214', which is uneconomical.

[0016] The present invention has been made to address such conventional circumstances, and an object thereof is to provide a check terminal structure in which poor conductivity between a pair of terminal plates or detachment of a connector plug is unlikely to occur even when the attachment and detachment of the connector plug to the gap between the pair of terminal plates made of a conductive metal material are repeated, and a check terminal using the same.

Means for Solving the Problems

[0017] The first invention of the checker terminal structure for solving the above problems is made of a conductive metal material, and includes a transformer terminal portion for connecting a transformer lead wire to one end side, and a first alternative meter lead wire. A first terminal plate having a first alternative meter terminal portion for connecting; a second terminal plate made of a conductive metal material, having a watt-hour meter terminal portion for connecting a watt-hour meter lead wire to one end side, and a second alternative meter lead wire A second alternative meter terminal portion for connecting; a plug provided between the other end of the first terminal plate and the other end of the second terminal plate to electrically connect the first terminal plate and the second terminal plate. The plug is made of a conductive metal material, and has a pair of flat surfaces arranged parallel to its axis and parallel to each other and having a distance smaller than the above gap, and is formed so as to connect the side edges of the flat surfaces and has a diameter reduction from the lower end side to the upper end side of the axis. A main shaft conductor having a circumferential side surface that is a pair of curved surfaces, a latching pin projecting from each of the pair of curved surfaces on the lower end side of the main shaft conductor, an operating knob made of an insulating material provided at the upper end of the main shaft conductor, and a coil spring provided on the outer surface of the upper end side of the main shaft conductor. The other end sides of the first and second terminal plates both have a groove portion formed on the end surface parallel to the axial direction of the main shaft conductor and having a shape that conforms to the curved surface of the main shaft conductor, and are formed on the side where the lower end of the main shaft conductor is arranged when the main shaft conductor is inserted into the gap. When the main shaft conductor is rotated about its axis, a slit for passing the latching pin from one side surface of the first and second terminal plates to the other side surface, and a fitting recess formed on the top surface in the slit for temporarily accommodating the latching pin passing through the slit. It is characterized by that. In the first invention of the above configuration, one end side of the first terminal plate acts as a terminal for connecting the transformer lead wire and the first alternative meter lead wire. Also, one end side of the second terminal plate acts as a terminal for connecting the watt-hour meter lead wire and the second alternative meter lead wire. Furthermore, the bolt interposed between the other end of the first terminal plate and the other end of the second terminal plate has the function of electrically connecting the first terminal plate and the second terminal plate. More specifically, the bolt has the function of electrically connecting the transformer (and the first alternative meter) and the power meter (and the second alternative meter). Also, the spindle conductor of the bolt has the function of filling the gap formed between the first terminal plate and the second terminal plate with a conductive metal material and electrically connecting them. Furthermore, since the distance between the pair of flat surfaces constituting the circumferential side surface of the spindle conductor is smaller than the distance of the gap between the first terminal plate and the second terminal plate, it has the function of enabling the insertion of the spindle conductor into the gap between the first terminal plate and the second terminal plate. In addition, after inserting the spindle conductor into the gap formed between the first terminal plate and the second terminal plate, the pair of curved surfaces constituting the circumferential side surface of the spindle conductor rotate the spindle conductor about its axis, so that it fits into the groove formed on the end face of the other end of the first and second terminal plates, that is, by adhering to the contact surface forming the inner surface of the groove, it has the function of surely electrically connecting the first terminal plate and the second terminal plate. Also, the latching pins projecting from the lower end side of the spindle conductor and respectively on each of the pair of curved surfaces enter the fitting recesses formed on the top surfaces of the slits formed on each of the first and second terminal plates, thereby having the function of temporarily fixing the spindle conductor of the bolt to each of the first and second terminal plates. Furthermore, the coil spring provided on the bolt biases the spindle conductor to be pulled upward on the upper end side of its axis, and has the function of maintaining the engaged state between the fitting recesses formed on each of the first and second terminal plates and the latching pins projecting from the spindle conductor of the bolt. That is, the coil spring has the function of preventing the bolt from falling off from the gap formed between the first terminal plate and the second terminal plate.

[0018] The second invention is the first invention described above, characterized in that the bolt is provided with an insulating coating covering the surface of the coil spring, or a cover that houses the coil spring inside and insulates it. According to the second invention with the above configuration, when a metal coil spring is used as the coil spring of the plug, it has the effect of insulating the surface of the coil spring. This has the effect of preventing an electric shock accident caused by an operator accidentally touching the metal coil spring during the operation of the plug.

[0019] The third invention is the first or second invention described above, characterized in that the knob of the plug is provided with an identifier for distinguishing the types of transformer lead wires or wattmeter lead wires. According to the third invention with the above configuration, since the knob of the plug is provided with an identifier, an operator can easily determine which check terminal structure the plug removed from an arbitrary check terminal structure was used in.

[0020] The fourth invention, the check terminal, is characterized by comprising the check terminal structure which is the first or second invention described above. The fourth invention with the above configuration specifies the check terminal comprising the check terminal structure which is the first or second invention as a product invention, and its effect is the same as the effects of the first and second inventions described above.

Advantages of the Invention

[0021] According to the first and fourth inventions, even if the attachment and detachment of the plug are repeated in the gap formed between the first terminal plate and the second terminal plate, it is difficult for problems such as poor conduction of the first and second terminal plates or the plug being easily detached from the above gap to occur. Therefore, according to the first and fourth inventions, a check terminal structure and a check terminal with excellent durability can be provided. As a result, the replacement frequency of the check terminal structure and the entire check terminal can be surely reduced, so that the costs required for the maintenance and repair of the power supply equipment can be reduced. Also, according to the first and fourth inventions, the reliability of the power supply equipment can be improved.

[0022] According to the second and fourth inventions, it is possible to improve the safety of an operator during the operation of a plug in a check terminal structure. Therefore, according to the second and fourth inventions, it is possible to provide a check terminal structure and a check terminal excellent in safety during operation.

[0023] According to the third invention, it is possible to prevent a plug used in another check terminal structure from being accidentally attached to an arbitrary check terminal structure. In this case, during the use of the check terminal structure, it is possible to prevent a malfunction (such as an error) from occurring during measurement by a power meter or the first and second alternative meters due to the unintentional change of the main shaft conductor (plug) that conducts the first and second terminal plates. Therefore, according to the third invention, the reliability of the power supply facility can be improved.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4A

Figure 4B

Figure 5A

Figure 5B

Figure 6A

Figure 6B

Figure 7

Figure 8

Figure 9

Figure 10A

Figure 10B

Figure 11A

Figure 11B

Figure 12A

Figure 12B

Embodiments for Carrying Out the Invention

[0025] The check terminal structure according to the embodiment of the present invention and the check terminal including the same will be described in detail with reference to FIGS. 1 to 7.

[0026] [1; About the Outline of the Present Invention] First, a check terminal according to an embodiment of the present invention (hereinafter simply referred to as "the present embodiment") will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view showing a check terminal according to the present embodiment. Further, FIG. 2 is a cross-sectional view of the check terminal according to the present embodiment shown in FIG. 1 cut along line A-A. As shown in FIG. 1, the check terminal 100 according to the present embodiment includes an outer box 101 and a check terminal terminal structure 1 provided inside the outer box 101.

[0027] The outer box 101 is configured in a bottomed box shape. The outer box 101 is configured to be sealable by a lid (not shown) for the check terminal terminal structure 1 provided inside the outer box 101. Further, the outer box 101 is configured to be able to introduce transformer lead wires 33 (for example, seven) from a transformer (not shown) and power meter lead wires 43 (for example, seven) from a power meter (not shown). Also, the outer box 101 is configured as a molded body made of a synthetic resin (for example, ABS resin).

[0028] As shown in FIGS. 1 and 2, the check terminal terminal structure 1 is configured to be able to connect transformer lead wires 33 from a transformer (not shown), power meter lead wires 43 from a power meter (not shown), and a first alternative meter lead wire 34 as a lead wire from an alternative meter (not shown). Also, as shown in FIG. 2, the check terminal terminal structure 1 mainly has a substrate 2, a terminal board 110, a transformer terminal portion 31, a power meter terminal portion 41, a first alternative meter terminal portion 32, a second alternative meter terminal portion 42, and a plug 6.

[0029] Furthermore, as shown in FIG. 2, the substrate 2 is configured as a rectangular plate-like member made of an insulating material. The substrate 2 is used as a base for fixing the check terminal terminal structure 1. The substrate 2 is fixed inside the outer box 101 by screws (not shown).

[0030] In the following description, as shown in FIG. 1, the short side direction in which the lateral side of the substrate 2 extends is defined as the "X direction", the longitudinal side direction in which the longitudinal side of the substrate 2 extends is defined as the "Y direction", and the thickness direction of the substrate 2 (the direction perpendicular to the plane of FIG. 1) is defined as the "Z direction".

[0031] As shown in FIG. 1, the terminal board 110 is made of a conductive metal material and has a rectangular parallelepiped shape elongated in the X direction. As shown in FIG. 2, the terminal board 110 is divided at the central portion in the X direction of the terminal board 110. In the present embodiment, the transformer side of the divided terminal board 110 is defined as the first terminal board 3, and the power meter side of the terminal board 110 is defined as the second terminal board 4 to distinguish them (see FIG. 2). Further, as shown in FIG. 2, the first terminal board 3 constituting the terminal board 110 has a transformer lead wire insertion hole 31a at one end 3a thereof. Further, as shown in FIG. 2, the second terminal board 4 constituting the terminal board 110 has a power meter lead wire insertion hole 41a at one end 4a thereof. Furthermore, there is a gap 5 between the other end 3b of the first terminal board 3 and the other end 4b of the second terminal board 4.

[0032] As shown in FIG. 2, the transformer lead wire insertion hole 31a is configured such that the end 33a as the conductor of the transformer lead wire 33 can be inserted therein. Also, as shown in FIG. 2, the power meter lead wire insertion hole 41a is configured such that the end 43a as the conductor of the power meter lead wire 43 can be inserted therein. Furthermore, a plug 6 described later is detachably fitted into the gap 5 between the first terminal board 3 and the second terminal board 4. The terminal board 110 (the first terminal board 3 and the second terminal board 4) configured as described above is arranged in parallel at a predetermined interval on the upper surface of the substrate 2 (the surface in the X direction) such that the longitudinal direction (X direction) of the terminal board 110 is orthogonal to the longitudinal direction (Y direction) of the substrate 2 as shown in FIG. 1, and seven are arranged.

[0033] As shown in Fig. 2, the transformer terminal portion 31 is provided on one end portion 3a side (left side in Fig. 2) of the upper surface (surface in the X direction) of the first terminal plate 3. Also, the transformer terminal portion 31 is a conductor portion to which transformer lead wires 33 (for example, seven) from a transformer (not shown) are connected. Specifically, the transformer terminal portion 31 is composed of two screws 31b1 and 31b2 made of metal. Also, the screws 31b1 and 31b2 are screwed into screw holes provided on one end portion 3a side (left side in Fig. 2) of the upper surface of the first terminal plate 3. The tip portions of the screws 31b1 and 31b2 are configured to be able to project inside the transformer lead wire insertion hole 31a. That is, the end portion 33a of the transformer lead wire 33 is tightened by the screws 31b1 and 31b2 and fixed inside the transformer lead wire insertion hole 31a. Thereby, the transformer lead wire 33 is electrically connected to the first terminal plate 3.

[0034] As shown in Fig. 2, the power meter terminal portion 41 is provided on one end portion 4a side (right side in Fig. 2) of the upper surface of the second terminal plate 4. Also, the power meter terminal portion 41 is a conductor portion to which power meter lead wires 43 (for example, seven) from a power meter (not shown) are connected. Specifically, the power meter terminal portion 41 is composed of two screws 41b1 and 41b2 made of metal. Also, the screws 41b1 and 41b2 are screwed into screw holes provided on one end portion 4a side (right side in Fig. 2) of the upper surface of the second terminal plate 4. The tip portions of the screws 41b1 and 41b2 are configured to be able to project inside the power meter lead wire insertion hole 41a. That is, the end portion 43a of the power meter lead wire 43 is tightened by the screws 41b1 and 41b2 and fixed inside the power meter lead wire insertion hole 41a. Thereby, the power meter lead wire 43 is electrically connected to the second terminal plate 4.

[0035] As shown in FIGS. 1 and 2, the first alternative meter terminal portion 32 and the second alternative meter terminal portion 42 are portions to which the first alternative meter lead wire 34 etc. from an alternative watt-hour meter (not shown) are connected. That is, the first alternative meter terminal portion 32 and the second alternative meter terminal portion 42 are used when temporarily connecting an alternative meter (not shown) or when connecting test equipment. The first alternative meter terminal portion 32 is provided so as to protrude from the upper surface of the first terminal plate 3. The second alternative meter terminal portion 42 is provided so as to protrude from the upper surface of the second terminal plate 4. The first alternative meter terminal portion 32 is provided adjacent to the transformer terminal portion 31, and the second alternative meter terminal portion 42 is provided adjacent to the watt-hour meter terminal portion 41. One set of the first alternative meter terminal portion 32 and the second alternative meter terminal portion 42 is provided in each check terminal structure 1. That is, the check terminal 100 according to the present embodiment includes seven first alternative meter terminal portions 32 and seven second alternative meter terminal portions 42, respectively.

[0036] More specifically, as shown in FIG. 2, the first alternative meter terminal portion 32 is provided closer to the gap 5 than the transformer terminal portion 31 on the upper surface of the first terminal plate 3. Also, as shown in FIG. 2, the first alternative meter terminal portion 32 includes a main body portion 32a provided to protrude from the upper surface of the first terminal plate 3 on the first terminal plate 3, and a screw 32c that can be screwed into the upper end portion (the tip portion in the Z direction) of the main body portion 32a. The main body portion 32a is a rod-shaped member (e.g., a cylindrical member) made of a conductive material. This main body portion 32a has a first alternative meter lead wire insertion hole 32b into which an end portion 34a as a conductor of the first alternative meter lead wire 34 can be inserted, and a threaded hole into which a screw 32c can be screwed. Further, the first alternative meter lead wire insertion hole 32b is provided so as to penetrate the main body portion 32a in the thickness direction of the main body portion 32a. Also, the first alternative meter lead wire insertion hole 32b is provided at a position higher than the transformer terminal portion 31 (the heads of the screws 31b1 and 31b2) in the Z direction shown in FIG. 2. Furthermore, the threaded hole for screwing the screw 32c is provided so as to communicate with the first alternative meter lead wire insertion hole 32b. Also, the screw 32c is composed of a head made of an insulating material and a shaft portion made of a conductive material. The head of the screw 32c is configured to be picked up and rotated by a finger. The shaft portion of the screw 32c is configured to be screwable into the threaded hole of the main body portion 32a. The tip end portion of the shaft portion of the screw 32c can project into the first alternative meter lead wire insertion hole 32b. That is, the end portion 34a of the first alternative meter lead wire 34 is clamped by the shaft portion of the screw 32c and fixed inside the first alternative meter lead wire insertion hole 32b. Thereby, the first alternative meter lead wire 34 is electrically connected to the first terminal board 3. As a result, a transformer (not shown) and an alternative meter (not shown) are electrically connected via the transformer terminal portion 31 and the first alternative meter terminal portion 32 of the first terminal board 3.

[0037] Furthermore, as shown in FIG. 2, the second alternative meter terminal portion 42 is provided closer to the gap 5 than the power meter terminal portion 41 on the upper surface of the second terminal board 4. Since the other configurations and structures of the second alternative meter terminal portion 42 are the same as those of the first alternative meter terminal portion 32, the description of the configuration of the second alternative meter terminal portion 42 is omitted here.

[0038] [2; Regarding the main part of the present invention] Referring to FIGS. 3A to 6B, the mechanism by which the terminal plate 110 (the first terminal plate 3 and the second terminal plate 4) in the check terminal structure 1 is electrically connected by the plug 6 will be described. FIG. 3A is a Z-direction cross-sectional view of the first and second terminal plates before inserting the plug into the gap, and FIG. 3B is a view seen from the direction of line P1-P1 in FIG. 3A.

[0039] (Regarding the plug) The plug 6 that constitutes the check terminal structure 1 according to the present embodiment includes a spindle conductor 61 made of a conductive metal material, a pair of latching pins 62 protruding on the circumferential side surface of the lower end side of the spindle conductor 61 and in a direction orthogonal to the axis T of the spindle conductor 61, an operating knob 63 made of an insulating material provided at the upper end 61a of the spindle conductor 61, and a coil spring 64 provided on the outer surface of the upper end 61a side of the spindle conductor 61. Note that the upper end of the coil spring 64 is fixed to the upper end 61a side of the spindle conductor 61 or the knob 63.

[0040] More specifically, the spindle conductor 61 of the plug 6 is formed parallel to its axis T, and a pair of flat surfaces 61e, 61e that are arranged parallel to each other and have a distance smaller than the distance of the gap 5, and a pair of curved surfaces 61d, 61d that are formed so as to connect the side edges of the flat surfaces 61e and are tapered so as to reduce the diameter from the lower end side to the upper end side of the axis T of the spindle conductor 61. It has a circumferential side surface.

[0041] That is, the spindle conductor 61 of the plug 6 is a taper that reduces the diameter from the lower end 61b side to the upper end 61a side, and a rod made of a conductive metal material is inserted into and removed from the gap 5 formed between the first terminal plate 3 and the second terminal plate 4. Its circumferential side surface is cut in the Z direction by a pair of flat surfaces (flat surfaces 61e, 61e) so as to have a possible thickness (X direction).

[0042] The main shaft conductor 61 as described above, in other words, is made of a conductive metal material, and the cross-sectional shape (see FIG. 4B shown later) when cut along a plane perpendicular to its axis T is formed by a pair of arcs (curved surfaces 61d; see FIG. 4B shown later) having the same length and a pair of parallel lines (flat surfaces 61e; see FIG. 4B shown later) having the same length. Also, the distance between the pair of arcs (curved surfaces 61d) in the above cross-sectional shape increases from the upper end 61a side to the lower end 61b side of the axis T of the main shaft conductor 61, and further, the distance between the pair of parallel lines (flat surfaces 61e) in the above cross-sectional shape is constant. It is a rod-shaped body.

[0043] Also, as shown in FIG. 3A, the latching pin 62 of the plug 6 is provided protruding from the curved surface 61d on the lower end side of the main shaft conductor 61 as described above.

[0044] (Regarding the first terminal board and the second terminal board) The other end 3b side of the first terminal board 3 into which the plug 6 is inserted and the other end 4b of the second terminal board 4 both have the following configuration. That is, on the end face 3c of the first terminal board 3 and the end face 4c of the second terminal board 4, there are respectively formed groove portions 35 having contact surfaces 35a (inner surfaces) that are formed parallel to the axis T of the main shaft conductor 61 when the plug 6 is inserted and have a shape that coincides with the curved surface 61d of the main shaft conductor 61. Furthermore, when the main shaft conductor 61 is inserted into the gap 5, each of the first terminal board 3 and the second terminal board 4 on the side where the lower end 61b is disposed has a slit 36 formed therein. When the main shaft conductor 61 is inserted into the gap 5 and rotated about its axis T as a base axis, the pair of latching pins 62, 62 protruding from the circumferential side surface of the main shaft conductor 61 can pass from one side surface side (the front side of the paper surface in FIG. 3A or the lower side of the paper surface in FIG. 3B) of the first terminal board 3 and the second terminal board 4 to the other side surface side (the back side of the paper surface in FIG. 3A or the upper side of the paper surface in FIG. 3B). In addition, on the top surface 36a of each slit 36, a fitting recess 47 for temporarily accommodating the latching pin 62 passing through the slit 36 is formed. That is, by accommodating (engaging) the latching pin 62 in the fitting recess 37 formed on the top surface 36a of the slit 36, the rotational movement of the spindle conductor 61 (connector plug 6) about the axis T can be restricted (stopped).

[0045] Subsequently, with reference to FIGS. 4A to 6B, the procedure for inserting and fixing the connector plug 6 in the gap 5 between the first terminal plate 3 and the second terminal plate 4 will be described. FIG. 4A is a Z-direction cross-sectional view of a state in which the spindle conductor of the connector plug is inserted into the gap between the first terminal plate and the second terminal plate, and FIG. 4B is a cross-sectional view taken along line P2 - P2 in FIG. 4A. FIG. 5A is a Z-direction cross-sectional view of a state in which the spindle conductor inserted into the gap between the first terminal plate and the second terminal plate is rotated 90° about the axis T, and FIG. 5B is a cross-sectional view taken along line P3 - P3 in FIG. 5A. FIG. 6A is a Z-direction cross-sectional view of a state in which the spindle conductor inserted into the gap between the first terminal plate and the second terminal plate is released from the pressing force after being rotated 90° about the axis T, and FIG. 6B is a cross-sectional view taken along line P4 - P4 in FIG. 6A. In the cross-sectional views of FIGS. 4A, 5A, and 6A, for easy understanding of the state of the spindle conductor 61 in the gap 5, a cross-sectional view of the spindle conductor 61 is shown on the left side of the drawing with respect to the axis T of the spindle conductor 61, and a side view of the spindle conductor 61 is shown on the right side of the drawing with respect to the same axis T. Further, in FIG. 5B, a cross-sectional view of the spindle conductor 61 of the connector plug 6 rotated 45° about its axis T is shown.

[0046] Step S1 when connecting the first terminal plate 3 and the second terminal plate 4 through the connector plug 6 to make them electrically conductive is, as shown in FIGS. 4A and 4B, while aligning the formation direction (Y direction) of the gap 5 and the protruding direction (Y direction) of the latching pin 62, that is, with the flat surface 61e of the spindle conductor 61 facing the end face 3c of the first terminal plate 3 or the end face 4c of the second terminal plate 4, it is the step of inserting the spindle conductor 61 of the connector plug 6 into the gap 5. In this step S1, the main shaft conductor 61 of the plug 6 is inserted from the upper surface side of the first terminal plate 3 and the second terminal plate 4 toward the substrate 2 side in the gap 5 (refer to the direction indicated by the reference symbol E in FIG. 4A). At this time, the coil spring 64 provided on the upper end 61a side of the main shaft conductor 61 is in a state of being compressed between the knob 63 and the first terminal plate 3 and the second terminal plate 4 by the insertion operation of the main shaft conductor 61. Also, at this time, when the main shaft conductor 61 of the plug 6 inserted into the gap 5 is viewed from the side (when the main shaft conductor 61 is viewed from the Y direction in FIG. 4A), it is sufficient that the latching pin 62 protruding from the lower end 61b side of the main shaft conductor 61 reaches the formation position of the slit 36.

[0047] The subsequent step S2 is a step of rotating the main shaft conductor 61 of the plug 6 (refer to the previous FIG. 4A) inserted into the gap 5 by 90° about its axis T (refer to the direction indicated by the reference symbol F in FIG. 5A). In step S2, a pair of latching pins 62 protruding from the main shaft conductor 61 of the plug 6 move from one side surface side to the other side surface side of the first terminal plate 3 (or the second terminal plate 4) within the slit 36 (refer to the direction indicated by the reference symbol G in FIG. 5B). Furthermore, when the first terminal plate 3, the second terminal plate 4, and the plug 6 are viewed in plan view, that is, when they are viewed from above in the Z direction, the rotation operation of the main shaft conductor 61 is stopped when the arrangement direction (X direction) of the first terminal plate 3 and the second terminal plate 4 coincides with the protruding direction (X direction) of the pair of latching pins 62 on the main shaft conductor 61 of the plug 6 (refer to FIG. 5A). Note that the latching pin 62 moving within the slit 36 is blocked by the first terminal plate 3 and the second terminal plate 4 and is not visible, but the protruding direction of the latching pin 62 can be easily inferred from the direction of the knob 63 of the plug 6 when viewed in plan view. Furthermore, in step S2, since it is necessary to move the pair of latching pins 62 within the slit 36, the operator (worker) of the plug 6 needs to rotate the main shaft conductor 61 about its axis T while pushing the main shaft conductor 61 of the plug 6 toward the substrate 2 side (the direction indicated by the reference symbol E in FIG. 5A), that is, while maintaining the compressed state of the coil spring 64.

[0048] The last step S3 is a step of releasing the pressing force that presses the main shaft conductor 61 of the plug 6 toward the substrate 2 in the state shown in FIG. 5A above. In step S3, the coil spring 64 that has been compressed until then is released from the compressive force, and the main shaft conductor 61 is pulled upward in the Z direction by the elastic repulsive force of the coil spring 64 accompanying this (refer to the direction indicated by the reference sign H in FIG. 6A). By this operation, a pair of latching pins 62 protruding from the main shaft conductor 61 are pulled upward in the Z direction (the direction indicated by the reference sign H in FIG. 6A) together with the main shaft conductor 61, and are accommodated in the fitting recess 37 formed on the top surface 36a of the slit 36 and engage with the first terminal plate 3 or the second terminal plate 4 (refer to FIGS. 6A and 6B). As a result, the main shaft conductor 61 of the plug 6 is fixed in the gap 5 between the first terminal plate 3 and the second terminal plate 4.

[0049] At this time, a force that pulls upward is constantly acting on the main shaft conductor 61 of the plug 6 by the elastic repulsive force of the coil spring 64 on the upper surface side of the first terminal plate 3 or the second terminal plate 4 (refer to the reference sign H in FIG. 6A), and the contact surface 35a (inner surface) between the curved surface 61d of the plug 6 and the groove portion 35 can be firmly adhered. As a result, the first terminal plate 3 and the second terminal plate 4 can be electrically connected by the main shaft conductor 61 of the plug 6.

[0050] Also, to remove the plug 6 from the gap 5 between the first terminal plate 3 and the second terminal plate 4, the procedures of steps S1 to S3 described above may be performed in the reverse order.

[0051] [3; Regarding the operation and effect of the present invention] In the check terminal structure 1 according to the present embodiment as described above, since the circumferential surface (particularly the curved surface 61d) of the main shaft conductor 61 of the plug 6 is brought into close contact by utilizing the elastic repulsive force of the coil spring 64 in the gap 5 between the first terminal plate 3 and the second terminal plate 4, friction hardly occurs between the main shaft conductor 231 of the plug 230 and the gap 214c between the terminal plates 214 and 214' as in the conventional check terminal structure 212 shown in FIGS. 8 to 12B above. Therefore, according to the check terminal terminal structure 1 according to this embodiment, even if the attachment and detachment operation of the plug 6 is repeated in the gap 5 between the first terminal plate 3 and the second terminal plate 4, poor conduction of the first terminal plate 3 and the second terminal plate 4, or the plug 6 is likely to come off from the gap 5. Such problems are unlikely to occur. Therefore, according to the check terminal terminal structure 1 according to this embodiment, it is possible to provide a check terminal terminal structure 1 and a check terminal 100 that are significantly more durable than the conventional check terminal 200. As a result, after the check terminal 100 according to this embodiment is once installed, the frequency of replacing the check terminal terminal structure 1 and the check terminal 100 can be relatively reduced, so that the costs required for maintenance and maintenance of the power supply facility can be reduced. In addition, it is possible to prevent problems such as the plug 6 accidentally coming off during the use of the check terminal terminal structure 1 or the check terminal 100, resulting in a sudden interruption of the conduction between the transformer and the power meter, or the inability to properly perform necessary tests.

[0052] [4; About the modification example of the present invention, etc.] (About the modification example of the plug) FIG. 7 is a side view showing a modification example of the plug in the check terminal terminal structure according to this embodiment. As shown in FIG. 7, the plug 6' according to the modification example may include a cover 65 provided to cover the circumferential side surface of the coil spring 64, particularly when a metal coil spring 64 is used. Further, as the material of the cover 65, a flexible insulating material such as resin, silicon, or rubber can be used. In this case, when the user (operator) attaches and detaches the plug 6' to and from the gap 5 between the first terminal plate 3 and the second terminal plate 4, it is possible to prevent an electric shock accident from occurring by touching the coil spring 64 that contacts the first terminal plate 3 and the second terminal plate 4, which are the charging parts. Therefore, when the plug 6' according to the modification example is used, the safety during the operation of the check terminal terminal structure 1 according to this embodiment can be improved.

[0053] Note that, in the plug 6' shown in FIG. 7, the case where a cover 65 made of an insulating material is provided on the circumferential side surface of a metal coil spring 64 having no insulating coating is taken as an example for explanation. However, when the metal coil spring 64 has an insulating coating, it is not necessary to provide the cover 65 because the insulating coating exhibits the same functions and effects as the cover 65.

[0054] (Regarding the identifier provided on the knob of the plug) As shown in FIG. 1 above, the check terminal 100 according to the present embodiment includes seven check terminal structures 1 according to the present embodiment. Each check terminal structure 1 is provided with a first terminal plate 3, a second terminal plate 4, and a plug 6 (or plug 6') as a set. In addition, since the plugs 6 (or plugs 6') used in the check terminal 100 all have the same structure, their conduction characteristics are also the same in principle. However, due to inevitable variations during manufacturing, the conduction characteristics are slightly different. Therefore, it is desirable that the plugs 6 (or plugs 6') used for any combination of the first terminal plate 3 and the second terminal plate 4 continue to use the same ones without being replaced. Therefore, it is preferable that the plugs 6 (or plugs 6') used in each check terminal structure 1 of the check terminal 100 according to the present embodiment can be individually identified.

[0055] In view of such circumstances, the plug 6 (or plug 6') of the check terminal structure 1 constituting the check terminal 100 according to the present embodiment may be provided with an identifier that can be visually distinguished as to which check terminal structure 1 it is used in. In addition, as this identifier, for example, a seal having a color corresponding to the color coding of the transformer lead wire 33 or the power meter lead wire 43 connected to each check terminal structure 1, or a seal with each color marked with characters (for example, "black", "red", "blue", "brown", "yellow", "white", "green") can be used.

[0056] And, when the knob 63 of the plug 6 (or plug 6') in each check terminal structure 1 of the check terminal 100 according to the present embodiment is configured to be distinguishable with an identifier (such as a seal) as described above, it is possible to prevent the plug 6 (or plug 6') used in another check terminal structure 1 from being accidentally interposed in the gap 5 between the first terminal plate 3 and the second terminal plate 4 of any check terminal structure 1. In this case, it is possible to prevent errors from occurring during measurement of power consumption or the like by a power meter (not shown) or first and second alternative meters (not shown) connected to the check terminal structure 1 due to an unintentional change in the main axis conductor of the plug 6 (or plug 6') that conducts the first terminal plate 3 and the second terminal plate 4 constituting the check terminal structure 1. Therefore, when the plug 6 (or plug 6') has an identifier, the reliability of the power supply facility including the check terminal 100 according to the present embodiment can be improved.

Industrial Applicability

[0057] As described above, the present invention is a check terminal structure and a check terminal using the same in which poor conduction of the terminal plate or detachment of the plug hardly occur even when the attachment and detachment of the plug are repeated in the gap between a pair of terminal plates, and can be used in the technical field related to power supply facilities and their maintenance facilities.

Explanation of Signs

[0058] 1... Check terminal terminal structure 2... Substrate 2a... Recess 3... First terminal plate 3a... One end 3b... The other end 3c... End face 31... Transformer terminal part 31a... Transformer lead wire insertion hole 31b1, 31b2... Screws 32... First alternative meter terminal part 32a... Body part 32b... First alternative meter lead wire insertion hole (lead wire insertion hole) 32c... Screws 33... Transformer lead wire 33a... End 34... First alternative meter lead wire 34a... End 35... Groove part 35a... Contact surface 36... Slit 36a... Top surface 37... Fitting recess 4... Second terminal plate 4a... One end 4b... The other end 4c... End face 41... Power meter terminal part 41a... Power meter lead wire insertion hole 41b1, 41b2... Screws 42... Second alternative meter terminal part 42a... Body part 42b... Second alternative meter lead wire insertion hole (lead wire insertion hole) 42c... Screws 43... Power meter lead wire 43a... End 5... Gap 6, 6’... Plug 61... Spindle conductor 61a... Upper end 61b... Lower end 61d... Curved surface (arc) 61e... Flat surface (parallel line) 62... Hanging pin 63... Knob 64... Coil spring 65... Cover 100... Check terminal 101... Outer box 110... Terminal plate 200... Check terminal 201... Outer box 212... Check terminal terminal structure 213... Substrate 213a... Recess 214, 214’... Terminal plate 214a... Transformer lead wire insertion hole 214b... Power meter lead wire insertion hole 214c... Gap 214 α , 214’ α ... The other end 215... Transformer terminal part 215a, 215b... Screws 216... Transformer lead wire 216a... Tip 220... Power meter terminal part 220a, 220b... Screws 221... Power meter lead wire 221a... Tip 226, 226a, 226b... Alternative meter terminal part 227... Body part 227a... Alternative meter lead wire insertion hole (lead wire insertion hole) 228... Screws 229... Alternative meter lead wire (lead wire) 229a... Tip 230... Plug 231... Spindle conductor 231a... Upper end 231b... Lower end 231c... Barrel part 232... Hanging pin 233... Knob 240... Slit 241... Ridge 242... Contact surface 243... Groove part U, T... Axis center

Claims

1. A first terminal board made of a conductive metal material, having a transformer terminal portion for connecting a transformer lead wire to one end side, and a first alternative meter terminal portion for connecting a first alternative meter lead wire; A second terminal board made of a conductive metal material, having a watt-hour meter terminal portion for connecting a watt-hour meter lead wire to one end side, and a second alternative meter terminal portion for connecting a second alternative meter lead wire; A plug is provided between the other end of the first terminal board and the other end of the second terminal board to electrically connect the first terminal board and the second terminal board; The plug is A main shaft conductor made of a conductive metal material, having a pair of flat surfaces formed parallel to its axis and arranged parallel to each other with a distance smaller than the gap, and a pair of curved surfaces which are tapered and formed to connect the side edges of the flat surfaces and whose diameter decreases from the lower end side to the upper end side of the axis, and having a peripheral side surface composed of these; Latching pins projecting from each of the pair of curved surfaces at the lower end side of the main shaft conductor; An operating knob made of an insulating material provided at the upper end of the main shaft conductor; A coil spring provided on the outer surface of the upper end side of the main shaft conductor; The other end sides of the first and second terminal boards both Have a groove portion formed on its end surface parallel to the axial direction of the main shaft conductor and having a shape conforming to the curved surface of the main shaft conductor; A slit is formed on the side where the lower end of the main shaft conductor is arranged when the main shaft conductor is inserted into the gap, and the latching pin is passed from one side surface of the first and second terminal boards to the other side surface when the main shaft conductor is rotated about the axis; A check terminal structure, characterized in that a fitting recess for temporarily accommodating the latching pin passing through the slit is formed on the top surface in the slit.

2. The check terminal structure according to claim 1, wherein the plug is provided with an insulating coating covering the surface of the coil spring, or a cover for accommodating the coil spring inside and insulating it.

3. The check terminal structure according to claim 1 or claim 2, wherein the knob of the plug is provided with an identifier for distinguishing the type of the transformer lead wire or the watt-hour meter lead wire.

4. A check terminal characterized by comprising the check terminal structure according to claim 1 or claim 2.

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