JP4707568B2 - Electric wire clamp and bypass device using the same - Google Patents

Description

  The present invention relates to an electric wire clamp and a bypass device using the electric wire clamp, and more specifically, can be suitably used when an electric wire clamp for branching by attaching a branch electric wire to a middle portion of the electric wire and an integrating wattmeter using the electric wire clamp. The present invention relates to a bypass device.

Conventionally, an electric wire clamp and a bypass device using the electric wire clamp are often used, for example, when replacing an integrating wattmeter used in a general home or factory, and include a hook body that can be easily connected to the electric wire of the integrating wattmeter. A pair of these wire clamps are attached to both ends of the branch wire that is a bypass wire, and the input side wire and the output side wire are directly connected via the integrating wattmeter to bypass. By doing so, a bypass device that replaces the integrated wattmeter with a new one is known (for example, see Patent Document 1).
The patent No. 3418925 gazette Embodiment of the conventional electric wire clamp by the structure mentioned above and a bypass device using the same is described with reference to FIGS. FIG. 8 is a configuration diagram showing an embodiment of a conventional electric wire clamp 8 having such a hook body. FIG. 9 is a block diagram showing an embodiment of a conventional bypass device 7 using the electric wire clamp 8 shown in FIG. FIG. 10 is a diagram illustrating a state where the integrating wattmeter 1 is bypassed by the bypass device 7 illustrated in FIG. 9.

  As shown in FIG. 8, one embodiment of a conventional wire clamp 8 is a clamp body 30 that includes a hook portion 32 that engages with an input-side wire 2 a and an output-side wire 2 b (see FIG. 10) of the integrating wattmeter 1. And a clamp screw 40 made of a conductive material facing the inside of the hook portion 32 of the clamp body 30 and screwed into the clamp body 30 to form a sharp portion 42 at the tip. Further, as shown in FIG. 9, the electric wire clamp 8 has a pair of clamp bodies 30 attached to both ends of the branch electric wire 3 which is a bypass electric wire, and clamp screws 40 (see FIG. 8). ) Is electrically connected to the bypass device 7. The branch wire 3 is provided with a breaker 4 in the middle so that electrical connection or disconnection can be selected when the integrating wattmeter 1 (see FIG. 10) is replaced.

  As shown in FIG. 10, the bypass device 7 using the conventional wire clamp 8 having such a structure has a pair of wire plugs 8 connected to both ends of the branch wire 3, and the input side wire 2 a of the integrating wattmeter 1. And bypassing by attaching to the output side electric wire 2b. Here, the integrating wattmeter 1 generally has three-phase wires of U, V, and W on the input side electric wire 2 a and the output side electric wire 2 b, and the electric wire clamps 8 are attached to both ends of the branch electric wire 3. Three bypass devices 7 provided in a pair are used (see FIG. 10) to bypass the U, V, and W of the input side electric wire 2a and the output side electric wire 2b in order. At this time, when the electric wire clamp 8 is attached to each of the plurality of electric wires 2 (six locations of the input side electric wire 2a and the output side electric wire 2b), the electric wire 2 is placed in the hook portion 32 of the clamp body 30 as shown in FIG. In the engaged state, the clamp screw 40 is tightened to fix it. At this time, when the clamp screw 40 is tightened, the sharpened portion 42 is inserted and pressed into a conductor portion (not shown) in the electric wire 2 while breaking the insulation coating of the electric wire 2, so that both ends via the branch electric wires 3 are inserted. Each electric wire 2 can be connected mechanically and electrically.

  Thus, the bypass device 7 using the conventional wire clamp 8 can be easily mechanically and electrically connected by engaging the wire 2 in the hook portion 32 of the clamp body 30 and tightening the clamp screw 40. Can be bypassed, and it is widely adopted by making it possible to replace the integrating wattmeter 1 without interruption in a short time.

However, in the conventional electric wire clamp and the bypass device using the electric wire clamp, as shown in FIG. 8, a structure in which the clamp screw 40 is tightened and the sharp portion breaks the insulating coating of the electric wire 2 and is electrically connected (needle electrode). In this structure, since the contact area between the sharp part 42 that breaks the coating of the clamp screw 40 and the conductor part (not shown) of the electric wire 2 that the sharp part 42 contacts is small, it is not suitable for a large current. There was a bug that there was.
Further, the conventional wire clamp and the bypass device using the same have a structure in which the clamp screw 40 shown in FIG. There has been a problem that there is a high possibility of contact failure if the fastening is loosened due to vibration or impact during the work after fastening.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an electric wire clamp that can easily connect a branch electric wire without requiring an electric wire peeling operation, secure a wide electric contact area, and can be reliably connected. An object of the present invention is to provide a bypass device using this.

  In order to solve the above-mentioned problems, the present invention is an electric wire clamp for branching by attaching a branch electric wire to the middle part of the electric wire, and has a peripheral wall surface surrounding the extension of the electric wire in a rectangular shape in a cylindrical shape. An opening hole that is opened on each side of the short side of the hollow inside the hollow so that the electric wire can be inserted into and removed from the hollow cylindrical shape by partially cutting out one side of the long side of the rectangle to make a C-shaped gap. And a pair of elastic portions each provided with a locking claw that is inserted into the hollow of the first housing while being biased outward on both sides and engaged with and fixed to the opening hole. And a second housing having a covering cutter that is supported between the elastic portions and is electrically connected to the branch wires to press-contact the wires housed in the hollow of the first housing. After the electric wire is housed in the housing, the second housing is inserted and the locking claws engage with the opening holes to fix each other. Coated cutter connecting the branch wires during insertion until the fixed, electrically provided in pressure-contact by peeling the cover by sliding along the wire.

  Here, the first housing is provided with ribs extending on both sides between the gap for entering and exiting the electric wire and the bottom surface in the hollow so that the electric wire is not caught by the elastic part inserted on both sides in the hollow. It is preferable to do. Moreover, it is preferable that the 1st housing | casing provides the anti-slip | slip part which forms an unevenness | corrugation in the bottom face inside divided by the rib, and prevents the electric wire from slipping. Moreover, it is preferable to provide the anti-slip | skid part so that it protrudes, inclining gradually high toward the insertion direction of a coating cutter, and an electric wire fully press-contacts a coating cutter. The anti-slip portion is provided separately from the first housing, is rotatably supported at the tip of a screw that penetrates and fastens from the outside to the bottom surface between the ribs, and changes the height by fastening the screw. It is preferable that the pressure at which the electric wire is pressed against the coated cutter is adjustable. Moreover, it is preferable that a covering cutter has a support part which protrudes between the elastic parts provided in the both sides of the 2nd housing | casing, and is supported by this support part so that attachment or detachment is possible.

  Moreover, the bypass device using the wire clamp according to the present invention is provided with a pair of the above-described wire clamps at both ends of a branch wire as a bypass wire. Here, it is preferable to provide a breaker at the center of the branched electric wire provided with electric wire clamps at both ends.

As described above, according to the electric wire clamp and the bypass device using the same according to the present invention, anyone can safely and reliably perform a single process by fitting two parts of the first housing and the second housing. A bypass wire can be attached. At this time, the coating cutter strips the coating of the electric wire over a wide range and makes electrical contact with the conductor part. It is possible to sufficiently cope with current.
Moreover, according to the electric wire clamp and the bypass device using the same according to the present invention, the second casing is inserted into the first casing and the locking claws engage with the opening holes to fix each other. As long as this latching claw is not removed, the electrical connection between the coated cutter and the wire is ensured by surface contact, and there is no contact failure at all. Can work on.

  Next, an embodiment of an electric wire clamp and a bypass device using the same according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing an embodiment of a bypass device using an electric wire clamp according to the present invention. FIG. 2 is an external view showing the electric wire clamp 6 shown in FIG. 1 in detail. FIG. 3 is a diagram showing an internal structure in which the first housing 10 shown in FIG. 1 is partially cut away. FIG. 4 is a view showing an attachment structure of the covering cutter 26 shown in FIG. FIG. 5 is a diagram showing an operation of attaching the electric wire clamp 6 shown in FIG. 2 to the integrating wattmeter 1. FIG. 6 is a diagram illustrating a state in which the coating cutter 26 illustrated in FIG. Moreover, FIG. 7 is a figure which shows the repair process of the electric wire 2 after replacement | exchange of the integrating wattmeter 1 shown in FIG.

  As shown in FIG. 1, the embodiment of the bypass device using the wire clamp according to the present invention includes a branch wire 3 having a breaker 4 interposed in the middle, and a first housing 10 and both ends of the branch wire 3. For example, as in the prior art shown in FIG. 10, U, V, and W three-phase input-side wires 2 a connected to the integrating wattmeter 1 and the output side are provided. The electric power 2b is electrically connected to each other, and the electric power meter 1 is bypassed to directly feed the electric power from the input electric wire 2a to the output electric wire 2b, thereby exchanging the electric power meter 1 without causing a power failure on the output side. It is provided as follows. In addition, the branch electric wire 3 shown in FIG. 1 and the breaker 4 interposed in it are well-known structures, and the same code | symbol as the prior art shown in FIG. 9 is described.

  Further, unlike the prior art shown in FIG. 8, the electric wire clamp 6 includes the first casing 10 and the second casing 20 described above, and includes a plurality of electric wires 2 (input-side electric wires 2 a and 2) of the integrating wattmeter 1. It is formed so as to be electrically connected to the output side electric wire 2b (see FIG. 10). More specifically, as shown in FIG. 2, the electric wire clamp 6 has a peripheral wall surface 12 that surrounds the periphery of the electric wire 2 in a rectangular shape in a cylindrical shape, and is partially cut out on one side of the long side of the rectangle. A first housing having a C-shaped gap 12a so that the electric wire 2 can enter and exit into a hollow cylindrical shape and has opening holes 12b that open on both short sides of the hollow in which the electric wire 2 is stored. 10 and a pair of elastic portions 22 provided with locking claws 22a that are inserted into the hollow of the first housing 10 while being biased outward on both sides and engaged with and fixed to the opening holes 12b. A second housing 20 having a covering cutter 26 that is supported between the elastic portions 22 and electrically connects the branch wires 3 and press-contacts the wires 2 accommodated in the hollow of the first housing 10. Each has. The electric wire clamp 6 is fixed to each other by inserting the second housing 20 after the electric wire 2 is housed in the first housing 10 and engaging the locking claw 22a with the opening hole 12b. The covering cutter 26 to which the branch electric wire 3 is connected at the time of insertion is provided so as to slide along the electric wire 2 to peel off the covering and to be electrically pressed.

  Here, the first housing 10 is provided with ribs 14 extending on both sides between the gap 12a for entering and exiting the electric wire 2 and the bottom surface in the hollow, and the first housing 10 in which the electric wire 2 is inserted on both sides in the hollow. It partitions so that it may not catch on the elastic part 22 of the body 10. FIG. Further, as shown in FIG. 3, the first housing 10 is formed with irregularities on the bottom surface inside which is partitioned by the ribs 14 so as to prevent slippage during peeling of the coating of the electric wire 2 (see FIG. 2). A non-slip portion 16 is provided. The anti-slip portion 16 protrudes while being gradually inclined toward the insertion direction of the covering cutter 26, and is provided so that the electric wire 2 is sufficiently pressed against the covering cutter 26 and can be reliably peeled along the electric wire 2. ing. Further, the anti-slip portion 16 is provided separately from the first housing 10, and is provided with an inclined table 16 a having a plate shape and having the above-described unevenness and a gradually protruding inclination on the upper surface, and the inclined table 16 a is ribbed. 14 is installed on the bottom surface of 14 and is rotatably supported at the tip of a screw 16b that penetrates and fastens from the outside. Therefore, the anti-slip part 16 can push up the inclined base 16a by fastening the screw 16b to change the height, and is provided so that the pressure at which the electric wire 2 is pressed against the coating cutter 26 can be adjusted.

  Further, referring to FIG. 2 again, the second housing 20 is disposed in such a manner that the elastic portions 22 are plate-shaped and face each other in parallel with a pair on both sides, and the central portions of the pair of elastic portions 22 are connected. A locking claw 22a that engages with the opening hole 12b of the first housing 10 described above is formed on either end of the elastic portion 22 that extends in parallel with each other. ing. Further, the second housing 20 further integrally forms a support portion 24 that extends from the center where the pair of elastic portions 22 are connected and protrudes between the elastic portions 22 provided with the engaging claws 22a. The support portion 24 extends in the center between the pair of elastic portions 22 and has an H-shaped cross section. The covering cutter 26 is detachably supported on the support portion 24 protruding between the elastic portions 22 of the first housing 10. At this time, the support portion 24 is not limited to having an H-shaped cross section, and it is easy to support the covering cutter 26 and insert it into the first housing 10 to peel off the covering of the electric wire 2. It is preferable to form in a shape that does not flex. Further, as shown in FIG. 4, the covering cutter 26 is installed on the lower surface of the support portion 24, and is fixed by fastening with a screw 25 that protrudes from the upper surface of the support portion 24 to the lower portion. . That is, the coating cutter 26 has a sharpness that deteriorates while the coating of the electric wire 2 is cut several times, and can be easily replaced by the screw 25 without using a special tool when the coating is not cut. It is formed in a simple structure.

  Further, as shown in FIG. 4, the end of the branch wire 3 that is a bypass wire is inserted into the covering cutter 26 through an opening hole provided in the support portion 24, and is electrically connected by, for example, soldering or the like. It is provided to connect to That is, the bypass device 5 shown in FIG. 1 is formed by connecting the wire plug 6 shown in FIG. 2 to both ends of the branch wire 3, and both ends of the branch wire 3 are supported by the support portion 24 shown in FIG. Each of the coated cutters 26 is electrically connected to each other. Therefore, in the bypass device 5 using the electric wire plug 6, the surface of the covering cutter 26 is brought into contact with the conductor portion of the electric wire 2, so that the branching electric wire 3 can be branched and bypass-connected. It is possible to make surface contact with which the plate-like surfaces come into wide contact, and to sufficiently cope with a large current.

  Next, with reference to FIGS. 5-7, the operation | movement which attaches the bypass apparatus 5 shown in FIG. First, when the bypass device 5 shown in FIG. 1 is attached to the integrating wattmeter 1, three bypass devices 5 are used as in the prior art shown in FIG. Each U, V, W of the electric wire and the output side electric wire is bypassed in order. At this time, it is preferable that the three bypass devices 5 are preferably provided with three kinds of colors (for example, black, white, and red) corresponding to the U, V, and W in order to prevent erroneous connection. . At this time, the bypass device 5 is preferably provided so as to be visible by coloring both or one of the wire clamp 6 and the branch wire 3. When each of the electric wire clamps 6 of the bypass device 5 is attached to a plurality of electric wires 2 (six locations of the input-side electric wire 2a and the output-side electric wire 2b: see FIG. 10), as shown in FIG. After the electric wire 2 is housed inside the gap 10a cut out in the C shape of the body 10, the second housing 20 is inserted into the first housing 10 until the locking claw 22a engages with the opening hole 12b. Push to fix each other. At this time, at the time of insertion until the second housing 20 is inserted into the first housing 10, the covering cutter 26 to which the branch wire 3 is connected slides along the wire 2 to cover the wire as shown in FIG. In order to cut off and peel off, the coating of the electric wire 2 is cut and peeled into a state of one end support shown by a dotted line in FIG. 6, and mechanically and electrically connected by electrically pressing the peeled internal conductor portion. Can be fixed. Here, as shown in FIG. 6, the first housing 10 is provided with the anti-slip portion 16, and by fastening the screw 16 b of the anti-slip portion 16, the inclined base 16 a is pushed up and the wire is connected to the coating cutter 26. 2 is adjusted so that it is fully pressed. Then, when the opening hole 12b of the first housing 10 shown in FIG. 5 and the latching claw 22 of the second housing 20 are engaged and fixed to each other, as described above, the back side surface of the coating cutter 26 Is fixed in a state of being in surface contact with the peeled conductor part of the electric wire 2, and the bypass connection is completed. At this time, unless the engagement between the opening hole 12b of the first housing 10 and the locking claw 22a of the second housing 20 is released, the electrical connection between the covering cutter 26 and the electric wire 2 is ensured. The slack of the clamp screw does not occur unlike the prior art shown in FIG.

  After that, when all three bypass devices 5 according to the present invention are attached to the integrating wattmeter 1 as in the prior art shown in FIG. 10, the integrating wattmeter 1 can be replaced by uninterruptible power. Perform the replacement work. At this time, as described above, the electric wire clamp 6 according to the present invention can be applied to the covering cutter 26 and the electric wire as long as the engagement between the opening hole 12b and the locking claw 22a is not released even with respect to vibration or impact during the replacement operation. The electrical connection with 2 is ensured, and it is possible to work safely without any contact failure. When the replacement of the new integrated wattmeter 1 is completed, the operator presses the opening holes 12b on both sides of the first housing 10 shown in FIG. 5 so that the engaging claws 22a are engaged in the opening holes 12b. The second housing 20 is detached from the first housing 10 and the electric wire clamp 6 can be easily removed from the electric wire 2. Here, as shown in FIG. 7, the coating of the electric wire 2 is scraped and peeled off by a coating cutter 26 (see FIG. 6) so that one end is supported. By returning the cover so as to cover it and winding the work tape 9, it becomes possible to repair the peeled coating with only the tape 9 in a short time.

As described above, according to the embodiment of the electric wire clamp and the bypass device using the electric wire clamp according to the present invention, anyone can secure the electric wire 2 by fitting two parts of the first housing 10 and the second housing 20 together. Thus, the bypass wire (branch wire 3) can be securely attached in a single process. At this time, the covering cutter 26 peels off the covering of the electric wire 2 in a wide range and makes electrical contact with the conductor portion. Surface contact with which the plate-like surface of the plate contacts widely is possible, and it is possible to sufficiently cope with a large current.
Further, according to the embodiment of the electric wire clamp and the bypass device using the same according to the present invention, the second housing 20 is inserted into the first housing 10 and the engaging claws 22a are engaged with the opening holes 12b, so that As long as the locking claw 22a is not removed, the electrical connection between the coating cutter 26 and the electric wire 2 by surface contact is ensured, and there is no contact failure at all. You can work safely and endure enough.

As mentioned above, although embodiment of the electric wire clamp by this invention and the bypass apparatus using the same was described in detail, this invention is not limited to embodiment mentioned above, It can change in the range which does not deviate from the summary. It is.
For example, the embodiment in which the anti-slip portion including the screw and the inclined base is provided separately from the first housing has been described in detail. However, the embodiment is not limited to this, and the wire thickness is constant. For example, the slope and unevenness of the tilt base may be formed integrally with the first housing instead of separately, without providing screws.

The block diagram which shows embodiment of the bypass apparatus using the electric wire clamp by this invention. The external view which shows the electric wire clamp shown in FIG. 1 in detail. The figure which shows the internal structure which notched the 1st housing | casing shown in FIG. 1 partially. The figure which shows the attachment structure of the coating cutter shown in FIG. The figure which shows the operation | movement which attaches the electric wire clamp shown in FIG. 2 to an integrating wattmeter. The figure which shows the state in which the coating | coated cutter shown in FIG. 5 peels the coating | cover of an electric wire. The figure which shows the repair process of an electric wire after replacement | exchange of the integrating | accumulating wattmeter shown in FIG. The block diagram which shows embodiment of the conventional electric wire clamp. The block diagram which shows embodiment of the conventional bypass device using the electric wire clamp shown in FIG. The figure which shows the state which bypassed the integral wattmeter by the bypass apparatus shown in FIG.

Explanation of symbols

1 watt-hour meter
2 Electric wires
3 Branch wire
4 Breaker
5 Bypass device
6 Electric wire clamp 10 1st housing | casing 12 Outer peripheral surface 12a Clearance 12b Opening hole 14 Rib 16 Antiskid part 16a Inclined base 16b Screw 20 2nd housing | casing 22 Elastic part 22a Locking claw 24 Support part 25 Screw 26 Covering cutter

Claims (6)

In the wire clamp that branches by attaching a branch wire to the middle part of the wire,
It has a peripheral wall surface that surrounds the periphery of the wire in a rectangular and cylindrical shape, and a part of the long side of the rectangle is partially cut away to leave a gap in a C shape so that the wire is placed in the cylindrical hollow. A first housing provided with opening holes that can be opened and closed, and open on the short side surfaces on both sides in the hollow housing the electric wire;
A pair of elastic portions provided with locking claws that are inserted into the hollow of the first housing while being biased outward on both sides and engage with and fixed to the opening holes are provided between the elastic portions. A second housing having a covering cutter that is supported and electrically connected to the branch wire and press-contacts the wire housed in the hollow of the first housing;
After the electric wire is housed in the first housing, the second housing is inserted, and the locking claw engages with the opening hole to fix each other. The covering cutter connected to the wire is slid along the electric wire to peel off the coating, whereby the electric wire and the branch electric wire are electrically pressed ,

The first housing is
Ribs that extend on both sides between the gap for entering and exiting the electric wire to the bottom surface in the hollow, and are partitioned so that the electric wire is not caught by the elastic part inserted on both sides in the hollow; and
An electric wire clamp , comprising: an anti-slip portion that forms unevenness on an inner bottom surface partitioned by the ribs to prevent the electric wire from slipping . The electric wire clamp according to claim 1 ,
The wire clamp, wherein the anti-slip portion protrudes while being gradually inclined toward the insertion direction of the covering cutter, and is provided so that the electric wire is sufficiently pressed against the covering cutter. The electric wire clamp according to claim 1 or 2 ,
The anti-slip portion is provided separately from the first housing, is rotatably supported at the tip of a screw that penetrates and fastens from the outside to the bottom surface between the ribs, and increases the height by fastening the screw. An electric wire clamp characterized in that the pressure at which the electric wire is pressed against the coating cutter can be adjusted by changing. In the electric wire clamp according to any one of claims 1 to 3 ,
The wire cutter according to claim 1, wherein the covering cutter has a support portion protruding between the elastic portions provided on both sides of the second casing, and is detachably supported by the support portion. A bypass device using an electric wire clamp, wherein the electric wire clamp according to any one of claims 1 to 4 is provided as a pair at both ends of the branch electric wire as a bypass electric wire. The bypass device according to claim 5 ,
A bypass device using an electric wire clamp, characterized in that a breaker is provided at a central portion of the branch electric wire provided with the electric wire clamp at both ends.

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