JP5294665B2 - Electric wire end cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable terminal cap which can prevent a wrong connection with a terminal of a cable while at a failure recovering work and can prevent a power theft effectively without changing a structure on a side of a terminal, and to provide a watt-hour meter provided with the cap. <P>SOLUTION: The cable terminal cap is composed of a cap portion 21 having an insertion port 24 into which cables 14, 15, 16 are inserted and an insertion projected portion 22 which is integrally formed with the cap portion 21 and can be inserted into an insertion hole arranged on a terminal block. The cap portion 21 and the insertion projected portion 22 are composed of an insulative material and when the insertion projected portion 22 is inserted into a cable insertion hole 31 arranged on the terminal block, the cable terminal cap is provided with a sealing structure which abuts with a port circumference of the cable insertion hole and covers and seals the cable insertion hole 31. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electric wire terminal cap that is used by being attached to an end of an electric wire when the electric wire is temporarily removed from a terminal of an instrument such as a watt hour meter or an instrument such as a lead-in branch terminal box to be in a non-energized state. .

  In a meter such as a watt-hour meter, for example, as shown in Patent Document 1, each electric wire on the power source side and the load side is inserted into the electric wire insertion hole of the terminal block arranged in parallel at the lower part of the main body of the meter. Normally, each electric wire is fastened and fixed with a terminal screw. For example, in a three-phase three-wire meter having such a configuration, when the low-voltage power contract is canceled and the electric supply is stopped, as shown in FIG. The operation of removing the two electric wires 101, 102, 103 from the terminals 105, 106, 107 of the terminal block 104 is performed.

At the same time, in order to insulate and waterproof the terminals of the removed electric wires, the terminals of the electric wires 101, 102, 103 are subjected to taping processing, or as shown in FIG. 7, electric wires are connected to the terminals of the electric wires 101, 102, 103. An operation of attaching the terminal cap 108 is performed (see Patent Document 2 and the like). Further, in order to protect the terminal and prevent theft, a terminal cover 108 that covers the terminal is attached to the front surface of the terminal block 104 to perform a sealing process.
JP 2003-75470 A JP-A-10-233134

However, even if each terminal 105, 106, 107 is covered and sealed with the terminal cover 108 as described above, a conductor such as a wire is placed in the wire insertion hole 110.111.112 opened on the lower surface of the terminal block 104. Since there is a case where power is stolen by plugging in, further measures are required. At this time, in order to prevent theft of electricity from below the terminal block 104, it may be possible to change the shape of the terminal cover 108 or the structure of the terminal block 104, but it is necessary to manufacture a new terminal cover or terminal block. In addition, there are inconveniences such as an increase in the number of parts due to the complicated structure.
Moreover, when performing the restoration work of the meter while taking into consideration the above-described prevention of theft, it is also required to connect each removed electric wire to a predetermined terminal without error.

  The present invention has been made in view of such circumstances, and it is possible to effectively prevent electric theft without changing the structure on the terminal side while preventing erroneous connection to the terminal of the electric wire at the time of restoration work. The main problem is to provide a possible wire terminal cap.

In order to achieve the above object, an electric wire terminal cap according to the present invention includes a cap portion having an insertion port into which an electric wire is inserted, and an electric wire insertion hole provided integrally with the cap portion and provided in the terminal block. The cap part and the insertion projection part are made of an insulating material, and when the insertion projection part is inserted into the wire insertion hole, it contacts the peripheral edge of the wire insertion hole. Having a sealing structure that is in contact with and covers and closes the wire insertion hole ;
The sealing structure is characterized in that the insertion protrusion is provided with a collar portion that can be brought into contact with the opening periphery of the wire insertion hole.

Therefore, according to such a configuration, when removing the electric wire connected to the terminal of the instrument or the like and stopping the electric supply, the end of the electric wire is inserted by inserting the terminal of the removed electric wire into the insertion port of the cap part. If the wire end cap is attached to the terminal, and then the insertion protrusion of the wire end cap is inserted into the wire insertion hole provided in the terminal block from which the wire has been removed, the wire end cap opening structure opens the wire insertion hole. The edges are covered and blocked. For this reason, there is no room for inserting a conductor such as a wire through the gap between the inner wall of the wire insertion hole and the insertion protrusion, and the wire end cap attached to the end of the wire can be removed by this sealing structure ( trench ). By inserting the electric wire into the removed electric wire insertion hole, it is possible to clarify the correspondence between the removed electric wire and the electric wire insertion hole to which the electric wire is to be attached.
Here, the insertion protrusion is integrally formed on the top of the cap portion, and the sealing structure is configured by the top of the cap portion. When the insertion protrusion is inserted into the wire insertion hole, the cap portion is formed on the periphery of the wire insertion hole. You may make it cover and close an electric wire insertion hole by making the end surface of the top part contact | abut.

Moreover, in order to achieve the said subject, the electric wire terminal cap which concerns on this invention has the cap part which has the insertion port in which an electric wire is inserted, and the electric wire insertion hole provided integrally in this cap part, and provided in the terminal block. And an insertion protrusion that can be inserted into
The cap part and the insertion projection part are made of an insulating material,
When the insertion protrusion is inserted into the electric wire insertion hole, it has a sealing structure in which the electric wire insertion hole is abutted against and covered with the opening periphery of the electric wire insertion hole,
The insertion protrusion is configured by a deformable outer shell body filled with an insulating fluid substance,
The sealing structure is configured such that when the insertion protrusion is inserted into the electric wire insertion hole, the fluid substance is moved to the proximal end side of the insertion protrusion to bulge a part of the outer shell. You may make it contact | abut to the periphery of the said electric wire insertion hole.

Here, you may make it the cap part of an electric wire terminal cap serve as an insertion protrusion part.
Moreover, in each structure mentioned above , you may make it integrally form the connection member connected with another cap part in a cap part.

As described above, the electric wire terminal cap according to the present invention is constituted by the cap portion into which the electric wire is inserted and the insertion protrusion portion integrally formed with the cap portion, and the insertion protrusion portion is inserted into the electric wire end cap. Since a sealing structure that covers and closes the wire insertion hole by contacting the opening periphery of the wire insertion hole when inserted into the hole is provided, when stopping the power supply, a wire end cap is attached to the end of the wire. By attaching and inserting the insertion protrusion of this wire end cap into the wire insertion hole, the opening periphery of the wire insertion hole is covered with the sealing structure of the wire end cap, so the inner wall of the wire insertion hole and the insertion protrusion It becomes impossible to insert a conductor such as a wire from the gap with the portion, and it is possible to reliably prevent theft.
Also, by inserting the insertion protrusion of the wire end cap into the wire insertion hole from which the wire has been removed, it is possible to clarify the correspondence between the removed wire and the wire insertion hole to which it should be attached. It is possible to prevent erroneous connection when reconnecting the electric wire and the terminal.

  Embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, the example which utilized the electric wire terminal cap 1 which concerns on this invention for the watt-hour meter 2 is shown. The watt-hour meter 2 shown in the figure is shown with the lid removed from the outdoor meter box 3 and the meter terminal cover removed, and a terminal block 4 is provided at the bottom of the meter body. 4 corresponds to a three-phase three-wire system in which terminals 5, 6, 7 on the power source side and terminals 8, 9, 10 on the load side are provided.

  The terminal 5 on the power source side is connected to the terminal of the electric wire 11 that is one of the electric power side electric wires, the terminal 6 is connected to the terminal of the ground side electric wire 12 that is one of the electric power side electric wires, and the terminal 7 is the electric power side electric wire. It is connected with the terminal of the electric wire 13 which is one of these. The ends of the electric wires 11, 12, and 13 are inserted into electric wire insertion holes formed in the terminal block 4, and are held by fastening terminal screws 18 and 19 to the terminals 5 to 7. These terminals 5 to 7 and the terminals of the electric wires 11 to 13 are normally connected unless the meter body of the watt-hour meter 2 is removed, and are not removed.

  In addition, the load-side terminal 8 is normally connected to the terminal of the electric wire 14 that is one of the load-side electric wires, and the terminal 9 is connected to the terminal of the ground-side electric wire 15 that is one of the load-side electric wires. The terminal 10 is connected to the terminal of the electric wire 16 which is one of the load side electric wires, and the terminal of each electric wire inserted through the electric wire insertion hole formed in the terminal block 4 is connected to each of the terminals 8 to 10. Similarly, the terminal screws 18 and 19 are held by tightening. On the other hand, when the electric power contract is canceled and the electric supply is stopped, all the electric wires 14 to 16 on the load side are once removed from the terminals 8 to 10 and, as shown in FIG. Is attached to the corresponding terminal.

  As shown in FIG. 2, the electric wire terminal cap 1 includes a cap portion 21 and an insertion projection portion 22. The cap portion 21 and the insertion projection portion 22 are formed of an insulating material such as synthetic resin.

  Of these, the cap portion 21 has a hollow, substantially bell-shaped shape, and one end in the longitudinal direction of the cap portion 21 is closed to form the top portion 23, and the other end is opened to open the electric wires 14, 15, The insertion port 24 into which 16 is inserted is configured. The cap portion 21 has a longitudinal dimension from the opening end to the top 23 of the insertion port 24 of about 6.0 cm, and an outer dimension of the insertion port 24 of about 2.5 cm.

  In this example, four thin plate-like holding pieces 25 to 28 are provided on the inner surface of the cap portion 21 at intervals of 90 degrees as a holding structure for holding the electric wire inserted from the insertion port 24 inside the cap portion 21. The cap piece 21 protrudes inward from the inner circumferential surface so that the holding piece 25 and the holding piece 27 and the holding piece 26 and the holding piece 28 face each other. These holding pieces 25 to 28 are formed of an elastic material that can expand and contract or buckle radially outward from the radial center point of the cap portion 21.

  In particular, in this example, as shown in FIG. 2A, each holding piece 25 to 28 gradually increases the protruding amount from the opening end of the insertion port 24, so that the holding pieces 25 to 28 face each other (for example, The taper-shaped first taper portion 29 whose size is gradually reduced from the insertion port 24 toward the back side, and from the terminal end of the first taper portion 29 to the top portion 23. A taper shape in which the projecting amount is temporarily increased with a slope different from that of the first tapered portion 28 and the dimension between the opposing holding pieces (for example, between the holding piece 25 and the holding piece 27) is temporarily reduced toward the top. The second taper portion 30 is configured.

  Thereby, even when it inserts the electric wire from which the diameter dimension differs from the insertion port 24 of the cap part 21, an electric wire can be hold | maintained reliably. That is, an electric wire having a relatively small diameter is inserted to reach the second tapered portion 30, whereby the holding piece 25 and the holding piece 27 that form the inner surface of the second tapered portion 30 and the holding piece 26 and the holding piece are held. The piece 28 contracts or buckles toward the outer peripheral side of the cap portion 21, and the repulsive force presses and holds the electric wire toward the center of the cap portion 21, so that the electric wire is held in the cap portion 21. . In addition, the electric wire having a relatively large diameter is inserted into the first tapered portion 29, so that the holding piece 25 and the holding piece 27 that form the inner surface of the first tapered portion 29, and the holding piece 26 and the holding piece 28. Is contracted or buckled toward the outer peripheral side of the cap portion 21 and the electric wire is pressed and clamped toward the center direction of the cap portion 21 by the repulsive force, so that the electric wire is held in the cap portion 21.

  As shown in FIG. 2B, the insertion protrusion 22 is inserted into the electric wire insertion hole 31 of the terminal block 4, and the diameter dimension of the insertion protrusion 22 is smaller than the diameter of the electric wire insertion hole 31. After being inserted, the terminal screws 18 and 19 provided on the terminals 8, 9 and 10 are fastened and fixed to the terminals 8, 9 and 10.

  The insertion protrusion 22 is continuously formed integrally with the cap portion 21 and has a certain degree of hardness, and at the same time, the shape can be easily changed. It is formed shorter than the depth of the insertion hole 31.

  The cap portion 21 has a diameter larger than the diameter of the insertion projection portion 22 and the diameter of the wire insertion hole 31. When the insertion projection portion 22 is inserted into the wire insertion hole 31 and pushed in, the cap portion 21 The end surface is brought into contact with the opening peripheral edge of the electric wire insertion hole 31.

  In the above configuration, when the electric wires 14, 15, 16 connected to the terminals 8, 9, 10 such as meters are removed and the electric supply is stopped, the terminals of the removed electric wires 14, 15, 16 are connected to the electric wire terminals. The cap portion 21 of the cap 1 is inserted into the insertion port 24, and the cap portion 21 is put on the ends of the electric wires 14, 15, 16. As a result, the ends of the electric wires 14, 15, 16 are held by holding pieces 25, 26, 27, 28 formed inside the cap portion 21. Thereafter, the insertion protrusion 22 of the electric wire terminal cap 1 is pushed into the electric wire insertion hole 31 from which the electric wire has been removed until the cap portion 21 abuts against the opening peripheral edge of the electric wire insertion hole 31, and the inserted insertion protrusion 22 is inserted into the terminal screw 18. , 19 are fastened and fixed, the electric wire insertion hole 31 is covered with the cap portion 21. For this reason, since the cap part 21 is brought into contact with the wire insertion hole 31 in front, a conductor such as a wire cannot be inserted through the gap between the inner surface of the wire insertion hole 31 and the insertion projection part 22, and theft is prevented. It becomes possible to prevent reliably.

  Moreover, the electric wire end cap 1 is attached to the terminal of the electric wires 14, 15, 16 removed from the terminals 8, 9, 10 and the insertion protrusion 22 of the electric wire end cap 1 is inserted into the electric wire insertion hole 31 from which the electric wire has been removed. Therefore, it is possible to clarify the correspondence between the removed electric wires 14, 15, 16 and the electric wire insertion hole 31 to which the electric wires 14, 15, 16 are to be attached, and incorrect connection is made when the electric wires and terminals are reconnected. It is possible to prevent it.

  In the above configuration, the sealing structure at the periphery of the wire insertion hole is configured by bringing the top portion 23 of the cap portion 21 of the wire terminal cap 1 into contact with the periphery of the wire insertion hole. As described above, a flange 33 having a diameter larger than that of the wire insertion hole 31 is formed integrally or separately in the middle of the insertion protrusion 22 (in the drawing, integrally formed), and the insertion protrusion 22 of the wire terminal cap 1 is connected to the electric wire. You may make it comprise by making this collar part 33 contact | abut to the opening periphery of the electric wire insertion hole 31, when inserting in the insertion hole 31. FIG.

  Even in such a configuration, if the insertion protrusion 22 of the wire end cap 1 is inserted to the extent that it can be inserted into the wire insertion hole 31 from which the electric wire has been removed, the flange portion 33 contacts the peripheral edge of the wire insertion hole 31. The wire insertion hole 31 is covered and covered with the flange 33. For this reason, since the eaves portion 33 is brought into contact with the wire insertion hole 31 in front, a conductor such as a wire cannot be inserted from the gap between the inner surface of the wire insertion hole 31 and the insertion protrusion 22, and power is stolen. It becomes possible to prevent reliably.

  Further, as shown in FIG. 4, the insertion protrusion 22 is constituted by an outer shell body 36 in which an accommodation space 35 filled with an insulating fluid substance 34 is formed, and the proximal end portion of the insertion protrusion 22 is formed. For example, when the thickness of the outer shell is reduced, the bulging portion 37 that allows the outer shell to bulge in the radial direction is provided, and the insertion protrusion 22 is inserted into the wire insertion hole 31 (inserted into the terminal screw). 18 and 19), the fluid 34 is moved to the proximal end side of the insertion protrusion 22 to bulge the bulging portion 37 of the outer shell 36, and the bulging bulged portion 37 is inserted into the electric wire. You may make it comprise a sealing structure by contact | abutting to the opening periphery of the hole 31. FIG.

  Even in such a configuration, as shown in FIG. 4B, after inserting the insertion protrusion 22 of the wire terminal cap 1 into the wire insertion hole 31, the inserted insertion protrusion 22 is inserted into the terminal screws 18, 19. By tightening, the fluid substance inside the insertion protrusion moves to the proximal end side, so that the bulging portion 37 bulges in the radial direction and can be brought into contact with the opening periphery of the wire insertion hole 31. The wire insertion hole 31 is covered and cannot be inserted into a gap between the inner wall of the wire insertion hole 31 and the insertion projection 22 and wire theft can be prevented. .

  In addition, in the above-mentioned structure, although the electric wire terminal cap 1 attached to the terminal of each electric wire was comprised with each independent member, even if it comprises a some electric wire terminal cap integrally, each electric wire terminal cap is comprised. A connecting member to be connected to the other cap portion may be integrally formed on the side surface of the cap portion 21 of the wire terminal cap 1, and a plurality of wire end caps may be connected by this connecting member.

  For example, as shown in FIG. 5, a pair of arm portions 38 provided so as to face each other with a space therebetween are inserted into the side surface of the cap portion 21, and the arm portions 38 are pushed apart and inserted. And an arm receiving portion 39 formed with a hole or recess (hole 39a in the drawing) for accommodating the tip portion, and the arm receiving portion 39 is pushed between the arm portions 38 so that the tip of the arm portion 38 is pushed. You may make it accommodate in the hole 39a of the arm receiving part 39, and you may make it connect.

  In the above-described configuration, in order to leave a trace of power theft, in the configuration of FIGS. 2 to 5, for example, the diameter is reduced between the cap portion 21 and the flange portion 33 of the insertion projection portion 22. It is also possible to form a broken part that makes it easy to break by cutting or making incisions, etc., and to break the broken part when an excessive force is applied.

  Moreover, in the above-mentioned structure, although the electric wire terminal cap 1 divided | segmented the cap part 21 which hold | maintains an electric wire, and the insertion protrusion part 22 integrated with this in the longitudinal direction of the electric wire terminal cap, it showed the example, As shown in FIG. 6, the cap part 21 may be formed so as to also serve as an insertion protrusion. That is, the entire wire terminal cap 1 is constituted by an outer shell body 42 such as a synthetic rubber in which an accommodation space 41 filled with an insulating fluid substance 40 is formed and which can be easily deformed. It is good also as what formed the diameter which can be inserted in the electric wire insertion hole 31, and opened the insertion port 24 which inserts an electric wire in the base end part on the opposite side to an insertion end part.

  In such a configuration, if the end of the electric wire is inserted from the insertion port 24 and the electric wire end cap 1 is attached to the end of the electric wire and then inserted into the electric wire insertion hole 31 from the insertion end, the electric wire end cap 1 is When the terminal screws 18 and 19 are tightened after being inserted while being deformed according to the shape of the electric wire insertion hole 31, the portions receiving the terminal screws 18 and 19 are deformed so as to be recessed. For this reason, when inserting the wire end cap 1 into the wire insertion hole 31 and when tightening the terminal screws 18 and 19, the internal fluid substance 40 moves and is collected to the proximal end side of the wire end cap 1, The base end side expands and comes into contact with the opening periphery of the electric wire insertion hole 31.

  Therefore, even in such a configuration, the wire insertion hole 31 is covered and blocked by the bulging portion of the wire end cap 1, so that a conductor such as a wire cannot be inserted into the wire insertion hole 31, and theft is prevented. It becomes possible to do.

FIG. 1 is a diagram showing a watt-hour meter using a wire terminal cap according to the present invention. 2A and 2B are diagrams showing an example of an electric wire end cap, where FIG. 2A is a single view of the electric wire end cap, and FIG. 2B is a side view showing a state where the electric wire end cap is attached to the terminal block. FIGS. 3A and 3B are diagrams showing another example of the wire terminal cap, wherein FIG. 3A is a single view of the wire terminal cap, and FIG. 3B is a side view showing a state where the wire terminal cap is attached to the terminal block. FIGS. 4A and 4B are diagrams showing another example of the wire terminal cap. FIG. 4A is a single view of the wire terminal cap, and FIG. 4B is a side view showing a state where the wire terminal cap is attached to the terminal block. 5A and 5B are diagrams showing another example of the wire terminal cap, wherein FIG. 5A is a single product diagram illustrating an example in which the connecting member is provided on the wire terminal cap, and FIG. 5B is a diagram showing the connecting member provided on the electronic wire terminal cap. The perspective view which shows an example, (c) is a bottom view which shows the state which connected the some electric wire terminal cap. 6A and 6B are diagrams showing another example of the wire terminal cap, where FIG. 6A is a single view of the wire terminal cap, and FIG. 6B is a side view showing a state where the wire terminal cap is attached to the terminal block. FIG. 7 is a conventional example showing a state in which the terminal of the electric wire is removed from the terminal when the low-voltage power contract is canceled in the three-phase three-wire watt-hour meter, (a) is a front view thereof, (b) Is a perspective view thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric wire terminal cap 14,15,16 Electric wire 21 Cap part 22 Insertion protrusion 24 Insertion port 31 Electric wire insertion hole 8, 9, 10 Terminal

Claims (4)

A cap part having an insertion port into which an electric wire is inserted, and an insertion projection part that is integrally formed with the cap part and can be inserted into an electric wire insertion hole provided in the terminal block,
The cap part and the insertion projection part are made of an insulating material,
When the insertion protrusion is inserted into the electric wire insertion hole, it has a sealing structure in which the electric wire insertion hole is abutted against and covered with the opening periphery of the electric wire insertion hole ,
The wire plug cap according to claim 1, wherein the sealing structure is configured by providing a hook portion on the insertion protrusion that can come into contact with an opening periphery of the wire insertion hole . A cap part having an insertion port into which an electric wire is inserted, and an insertion projection part that is integrally formed with the cap part and can be inserted into an electric wire insertion hole provided in the terminal block,
The cap part and the insertion projection part are made of an insulating material,
When the insertion protrusion is inserted into the electric wire insertion hole, it has a sealing structure in which the electric wire insertion hole is abutted against and covered with the opening periphery of the electric wire insertion hole ,
The insertion protrusion is configured by a deformable outer shell body filled with an insulating fluid substance,
The sealing structure is configured such that when the insertion protrusion is inserted into the electric wire insertion hole, the fluid substance is moved to the proximal end side of the insertion protrusion to bulge a part of the outer shell. An electric wire end cap that is brought into contact with a peripheral edge of the electric wire insertion hole. The electric wire terminal cap according to claim 2, wherein the cap portion also serves as the insertion protrusion. The electric wire terminal cap according to any one of claims 1 to 3 , wherein a connecting member connected to another cap portion is integrally formed on the cap portion.

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