JP2002184482A - Electric wire clamp and bypass device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire clamp capable of greatly enhancing the effectiveness in the mounting and dismounting works to an electric wire and also a bypass device using the clamp. SOLUTION: For connecting a bypass wire 3 with a part midway the electric wires 6 and 7, the electric wire clamp 4 is installed at the end of the bypass wire 3, and the configuration comprises a clamp body 10 having a hook part 12 to be engaged with the part midway the wires 6 and 7, a nut member 20 made of an electric conductive material and connected with the bypass wire 3 electrically in which the threaded hole 22 is set on the clamp body 10 as facing the hook part 12, and a clamp screw 23 made of an electric conductive material and arranged capable of emerging and retracting to/from the hook part 12 while it is engaged with the threaded hole 22 in the nut member 20, wherein the clamp screw 23 is furnished with a pointed tip 24 to be connected electrically with the wires 6 and 7 through the insulating coverings of them 6 and 7 engaged with the hook part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire clamp suitable for connecting electric wires to each other and a bypass device which can be suitably used when replacing an integrating wattmeter.

[0002]

2. Description of the Related Art As a method of replacing an integrating wattmeter used in general households and factories, a bypass device having a bypass wire provided with a breaker at an intermediate portion and wire clamps provided at both ends of the bypass wire. Using this bypass device, the input power wire and the output wire of the integrating wattmeter are electrically connected to each other, and the integrating wattmeter is replaced with a new one.After the replacement of the integrating wattmeter, the bypass device is removed. A replacement method in which an adhesive or the like is filled in a damaged portion of an insulating coating of an input / output wire to prevent a leakage or the like has been widely adopted because an integrating wattmeter can be replaced without interruption.

[0003] As the electric wire clamp of the bypass device, a clamp body having a hook engaged with an input side electric wire and an output side electric wire, and a clamp screw made of a conductive material which faces the hook and is screwed to the clamp main body. And
2. Description of the Related Art A clamp screw having a sharp portion at a distal end thereof, and a connector for connecting a base end of the clamp screw and an end of a bypass electric wire have been put into practical use. Then, when attaching the wire clamp to the input / output wire, with the input / output wire engaged with the hook, tighten the clamp screw to break the sharp coating while breaking the insulation coating of the input / output wire. Insert the wire clamp into the wire, mechanically and electrically connect the wire clamp to the input and output wires, then connect the bypass wire to the base end of the clamp screw via a connector, and clamp the wire clamp to the input and output wires. Attached.

[0004]

By the way, in the bypass device having the above-described electric wire clamp, when the integrating wattmeter is replaced, the work of fixing the clamp screw to the input / output electric wire and the bypass electric wire to the clamp screw are performed at the construction site. It is necessary to perform two types of work on the input side and the output side, respectively, and in the case of three-phase AC,
Since the same operation needs to be performed six times in total for three sets of electric wires, the operation is very complicated. Also, since the bypass device is composed of three parts, the bypass electric wire and the two electric wire clamps, it is necessary to transport a total of nine parts to the construction site when replacing the three-phase AC integrated wattmeter. The management and transportation of parts were very complicated.

An object of the present invention is to provide an electric wire clamp capable of significantly improving the attachment and detachability of an electric wire, and a bypass device using the same.

[0006]

An electric wire clamp according to the present invention is an electric wire clamp provided at an end of a second electric wire so as to electrically connect a second electric wire to an intermediate portion of the first electric wire. A clamp body having a hook engaged with an intermediate portion of the first electric wire; and a nut member made of a conductive material incorporated in the clamp body with the screw hole directed toward the hook. An electrically connected nut member, and a clamp screw made of a conductive material screwed into a screw hole of the nut member and capable of protruding and retracting toward a hook portion, the first electric wire being engaged with the hook portion Through the insulating coating of the first
And a clamp screw provided with a sharp portion at the distal end that can be electrically connected to the electric wire.

In this electric wire clamp, a clamp screw is screwed into a nut member made of a conductive material, and the second electric wire can be electrically connected and fixed to the nut member in advance. It is possible to electrically connect the first electric wire and the second electric wire, or to electrically separate the first electric wire and the second electric wire, and to operate the clamp screw with a power tool or the like. Therefore, the attachment and detachability of the wire clamp with respect to the first wire can be remarkably improved. In addition, since the wire clamp can be transported to the construction site in a state where the wire clamp is attached to the second wire, the transportability of the wire clamp can be improved and parts management can be facilitated.

Here, it is preferable that a cover member made of an insulating material that covers at least a connection portion between the first electric wire and the clamp screw is provided on the clamp body so as to be switchable between a use position and a retracted position. By providing such a cover member, careless electric shock, short circuit, etc. can be prevented by covering the connection portion between the first electric wire and the clamp screw without deteriorating the attachment and detachability of the electric wire clamp to the first electric wire. Can be prevented. Further, in this case, if the cover member is formed with a movement restricting portion that restricts the movement of the first electric wire hooked on the hook portion, when the clamp screw is inserted into the first electric wire, the first electric wire is prevented from moving.
It is possible to prevent the wire from accidentally falling off the hook.

The bypass device according to the present invention has the following features.
3. The electric wire clamp according to claim 3, which is provided at both ends of a second electric wire as a bypass electric wire. In this bypass device, since the electric wire clamp according to any one of claims 1 to 3 is used, it is possible to remarkably improve the attachability and the detachability of the bypass device, and to improve the bypass device such as the integrating power meter. Replacement work can be significantly improved.

[0010] Here, a stretchable cover made of an insulating material elastically deformable in the longitudinal direction of the first electric wire, which is sheathed laterally at an intermediate portion of the first electric wire, comprising: When the first electric wire is attached to the first electric wire in a compressed state between the clamps and the first electric wire is removed from the device to be bypassed,
It is preferable to provide a telescopic cover that can be extended to cover the conductive wire of the first electric wire. In other words, when replacing a bypassed device such as an integrating wattmeter, the first wire on the input side and the first wire on the output side connected to the device to be bypassed are electrically connected to each other by the bypass device. In this case, the first electric wire is extracted and replaced, but at this time, the end of the extracted first electric wire is in a dangerous state in which the conductive wire is exposed. According to the present invention, when the device to be bypassed is attached to the first wire, the telescopic cover is attached to the first wire in advance between the machine frame of the device to be bypassed and the wire clamp, so that the first wire is removed from the device to be bypassed. When the telescopic cover is stretched and the conductive wire exposed at the end of the first electric wire is covered by the telescopic cover, the conductive wire can be prevented from being exposed and the work safety can be further improved. become.

In the case where such a telescopic cover is provided, one end of the telescopic cover is engaged with a cover member of an electric wire clamp to form an engaging portion for restricting the telescopic cover from falling off from the first electric wire. Is preferred.

[0012]

Embodiments of the present invention will be described below. As shown in FIGS. 1 and 2, the bypass device 1
Is a bypass electric wire 3 with a breaker 2
And three electric wire clamps 4 provided at both ends of the bypass electric wire 3, for example, as shown in FIG. 1, three input-side electric wires 6 and three output sides connected to an integrating wattmeter 5 as a device to be bypassed. By electrically connecting the electric wires 7 to each other and bypassing the integrating wattmeter 5 to supply power from the input-side electric wire 6 to the output-side electric wire 7, the integrating wattmeter 5 can be replaced without a power outage on the output side. It is to make. Note that the bypass wire 3 corresponds to a second wire, and the input wire 6 and the output wire 7 correspond to a first wire. The bypass wire 3 and the breaker 2 interposed therebetween have a known configuration.

The electric wire clamp 4 will be described with reference to FIG.
As shown in FIG. 6, the main body 11 and the main body 1 each have a rectangular parallelepiped shape.
1, a clamp body 10 having a protruding hook portion 12 provided on the left portion thereof and made of a synthetic resin material having excellent insulation properties such as nylon-based resin is provided, and a tip portion of the hook portion 12 and a main body portion 11 are provided. An opening of the hook portion 12 is formed downward between them. Inside the main body 11, a square hole 13 whose lower surface is open, and a screw insertion hole 14 that opens toward the electric wires 6 and 7 that penetrate through the main body 11 and the square hole 13 and are locked by the hook 12. And a terminal fixing hole 15 extending from the front side of the main body 11 to the square hole 13, and a wire mounting hole 16 disposed on the right side of the main body 11 in parallel with the screw insertion hole 14 and opening to the terminal fixing hole 15. Have been.

A nut member 20 made of a conductive material is mounted on the inner side of the square hole 13 so as to be relatively non-rotatable, and a lid member 21 made of the same kind of synthetic resin material as the clamp body 10 is provided on the opening side of the square hole 13. Are fixed by heat sealing or ultrasonic sealing, and a screw hole 22 is formed in the nut member 20 so as to communicate with the screw insertion hole 14. If the lid member 21 and the clamp body 10 are made of an insulating material, they can be made of the same kind of material or different kinds of materials. Also, nut member 2
In the case of No. 0, it is also possible to integrally mount the inside of the clamp body 10 by insert molding when the clamp body 10 is formed.

A clamp screw 23 made of a conductive material is mounted in the screw insertion hole 14 of the clamp body 10, and an intermediate portion of the clamp screw 23 is screwed into a screw hole 22 of the nut member 20. The tip of the clamp screw 23 has a sharp portion 2
4 is formed, and at the base end of the clamp screw 23, an operation portion 25 formed of a minus groove, a plus groove, a hexagonal groove, or the like that can be rotated by an electric tool is formed. Then, the input side electric wire 6 or the output side electric wire 7 is hooked on the hook portion 12, and the clamp screw 23 is screw-operated with an electric tool, so that the sharp portion 24 is hooked on the hook portion 12 or the input side electric wire 6 or the output side. The electric wire 7 is inserted into the electric wire through the insulating coating, and the clamp screw 23 is configured to be electrically connected to the electric wire.

An electrode terminal 26 is fixed to an end of the bypass electric wire 3, an end of the bypass electric wire 3 including the electrode terminal 26 is attached to the electric wire mounting hole 16, and a conductive portion of the bypass electric wire 3 is moved out of the clamp body 10. It is configured not to be exposed. The electrode terminal 26 is fixed in the terminal fixing hole 15 by the fixing screw 2.
7 and is fixed to the nut member 20 via the bypass electric wire 3.
Is electrically connected to the clamp screw 23 via the electrode terminal 26 and the nut member 20.

The clamp body 10 is provided with a cover member 30 made of an insulating material having the following structure so as to prevent electric shock and short circuit. As shown in FIGS. 3 to 6, the cover member 30 is constituted by a member having a substantially U-shaped cross section having front and rear vertical wall portions 31 and 32 and a bottom wall portion 33 connecting the front and rear vertical wall portions. Slots 34 extending in the left-right direction are formed in the walls 31 to 33, respectively, and the cover member 30 is retracted to the clamp body 10 via a screw member 35 attached to the elongated holes 34, as shown by a solid line in FIG. It is movably assembled over a position and a retracted position shown by a virtual line in FIG.

At the left side of the front and rear vertical wall portions 31 and 32, a cutout portion 36 through which the input side electric wire 6 or the output side electric wire 7 is inserted at the use position is formed, and the cover member 30 is moved to the use position. In addition, the joint between the clamp screw 23 and the input-side electric wire 6 or the output-side electric wire 7 is covered, and the opening of the terminal fixing hole 15 in which the fixing screw 27 is arranged is closed to prevent electric shock, short circuit, and the like. Have been. In the present embodiment, the conductive portion is covered by the sliding operation of the cover member 30. However, the cover may be covered by rotation or rotation. Also, the cover member 3
The portion below the notch 36 among the portions 0 functions as a movement restricting portion 37 of the input-side electric wire 6 or the output-side electric wire 7 hooked on the hook portion 12, and in a state where the cover member 30 is moved to the use position, The movement restricting portion 37 overlaps the front end portion of the hook portion 12 back and forth to prevent the wire hooked on the hook portion 12 from accidentally dropping out of the opening portion of the hook portion 12 and to prevent the electric wire from slipping when the clamp screw 23 is inserted. Since the wire is fixed so as not to escape, it is possible to reliably insert the sharp portion 24 of the clamp screw 23 into the center of the wire.

As shown in FIG. 7, the bypass device 1 is attached to the integrating wattmeter 5 together with a telescopic cover 40 formed of a bellows-like cylindrical body that can be provided on the electric wires 6 and 7. The telescopic cover 40 is made of an insulating and elastic synthetic rubber or the like.
One portion in the circumferential direction is cut along the entire length so as to be attached to the electric wires 6 and 7 from the side. The bellows groove portion of the telescopic cover 40 is formed in a size that allows the cutout portion 36 of the cover member 30 to be inserted. The telescopic cover 40 is covered with the electric wires 6 and 7, and the hook portion 12 of the electric wire clamp 4 is connected to the electric wires 6 and 7. Hook on the telescopic cover 40
The cover member 30 is moved to the use position while the notch 36 is engaged with one end of the cover, and the upper edge and the lower edge of the notch 36 are engaged with the telescopic cover 40.
0 is fixedly held by the wire clamp 4.

When the wire clamp 4 is attached to the wires 6 and 7, the cover member 30 of the wire clamp 4 is engaged with one end of the telescopic cover 40 in advance as shown in FIG. The telescopic cover 40 is fixed to the wire clamp 4, and the telescopic cover 40 is sheathed in a compressed state on the electric wires 6 and 7 between the wire clamp 4 and the machine frame 5 a of the integrating wattmeter 5 so that the integrating wattmeter 5 can be replaced. Therefore, when the electric wires 6 and 7 are removed from the integrating wattmeter 5, the telescopic cover 40 is extended as shown in FIG. 7B so that the conductive wires 6a and 7a of the electric wires 6 and 7 are covered. Will do.
However, as the elastic cover 40, one having a configuration other than the bellows shape can be adopted.

Next, an example of a method of replacing the integrated wattmeter 5 will be described. First, with the cover member 30 moved to the retracted position, the left and right wire clamps 4 of the bypass device 1 are moved.
After hooking the hook portions 12 on the corresponding electric wires 6 and 7, respectively, and covering the telescopic cover 40 with the electric wires 6 and 7 between the hook portion 12 and the machine frame 5a of the integrating wattmeter 5,
The cover member 30 is moved to the use position, and the telescopic cover 4 is moved.
0 is engaged with the notch 36 of the cover member 30,
The screw member 35 is fastened to fix the cover member 30 at the use position. This work is performed for the electric wires 6 and 7 of each phase of the three-phase AC, and the three bypass devices 1 are connected to the three input-side electric wires 6.
And attached to the output side electric wire 7 sequentially.

Next, the electric wire clamp 4 is moved along the electric wires 6 and 7 toward the machine frame 5a of the integrating wattmeter 5 to compress the telescopic cover 40 as shown in FIG. The screw 23 is screwed with a power tool (not shown), the insulating coating is penetrated, the sharp portion 24 of the clamp screw 23 is inserted into the electric wire, and the clamp screw 23 and the electric wires 6 and 7 are electrically connected. The clamp 4 is fixed to the electric wires 6 and 7. This operation is sequentially performed on the six electric wire clamps 4, and the three input-side electric wires 6 and the three output-side electric wires 7 are connected via the three bypass devices 1 so that the integrated wattmeter 5 is bypassed. Are electrically connected. However, one bypass device 1 is attached to the input-side electric wire 6 and the output-side electric wire 7, and the input-side electric wire 6 and the output-side electric wire 7 are electrically connected by screwing the clamp screw 23. The device 1 may be similarly assembled to the input side electric wire 6 and the output side electric wire 7.

Next, the input-side electric wire 6 and the output-side electric wire 7 are extracted from the integrating wattmeter 5, the input-side electric wire 6 and the output-side electric wire 7 are connected to the new integrating wattmeter 5, and the integrating wattmeter 5 is replaced. . At this time, in conjunction with the operation of extracting the input-side electric wire 6 and the output-side electric wire 7 from the integrating wattmeter 5, FIG.
As shown in FIG.
And the conductive wires 6a, 7a of the output side electric wire 7
To prevent the conductive wires 6a and 7a from contacting another object, thereby preventing electric shock, short circuit, and the like.

Next, six wire clamps 4
, And loosen the sharp part 24 with the electric wire 6,
7, the cover member 30 is moved to the retracted position, and the bypass device 1 is removed from the electric wires 6 and 7. Then, in order to prevent electric leakage or the like, the insulating coating portion of the electric wire damaged by the insertion of the sharp portion 24 of the clamp screw 23,
Filling with a filler or an adhesive made of an insulating material completes the replacement of the integrating wattmeter 5.

In the present embodiment, the present invention is applied to the bypass device 1 used when replacing the integrating wattmeter 5, but the bypass device 1 can also be used when replacing other electric equipment. The electric wire clamp 4 can be used as a connector for electric wires in various electric devices other than the integrating wattmeter 5.

[0026]

According to the wire clamp of the present invention, the first wire and the second wire can be electrically connected or the first wire and the second wire can be electrically connected only by operating the clamp screw. Since the clamp screw can be operated with a power tool or the like, the attachment and detachability of the wire clamp with respect to the first wire can be significantly improved. In addition, since the wire clamp can be transported to the construction site with the wire clamp attached to the second wire,
The transportability of the wire clamp can be improved, and parts management becomes easy.

When a cover member made of an insulating material for covering at least a connection portion between the first electric wire and the clamp screw is provided on the clamp body so as to be switchable between a use position and a retracted position,
Inadvertent electric shock, short circuit, and the like at the connection portion between the first electric wire and the clamp screw can be prevented without lowering the attachment and detachability of the electric wire clamp with respect to the first electric wire.
In addition, when the cover member is formed with a movement restricting portion that restricts the movement of the first electric wire hooked on the hook portion, the first electric wire accidentally falls off from the hook portion when the clamp screw is inserted into the first electric wire. This can prevent the clamp screw from being inserted into the first electric wire and improve the safety at the time of insertion.

According to the bypass device according to the present invention, since the electric wire clamp according to any one of claims 1 to 3 is used, the attachment and detachability of the bypass device can be remarkably improved, and the integrated power Replacement work of devices to be bypassed such as a meter can be remarkably improved.

In this case, when a telescopic cover made of an insulating material elastically deformable in the longitudinal direction of the first electric wire is provided in the middle of the first electric wire from the side, the device to be bypassed becomes the first electric wire.
When attaching to the electric wire, the telescopic cover is previously attached to the first electric wire between the machine frame of the device to be bypassed and the electric wire clamp, so that when the first electric wire is pulled out from the device to be bypassed, the telescopic cover expands, By configuring so that the conductive wire exposed at the end of the first electric wire is covered with the elastic cover, exposure of the conductive wire can be prevented, and work safety can be further improved.

Further, by forming an engaging portion at one end of the telescopic cover which is engaged with the cover member of the electric wire clamp to prevent the telescopic cover from falling off from the first electric wire, the telescopic cover can be mounted without increasing the number of parts. It can be fixed to the cover member of the wire clamp.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method of replacing an integrating wattmeter.

FIG. 2 is a front view of a bypass device.

FIG. 3 is a front view of an electric wire clamp.

FIG. 4 is a bottom view of the electric wire clamp.

FIG. 5 is a longitudinal sectional view of an electric wire clamp.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 3;

7A is an explanatory view of a method of attaching an electric wire clamp to an electric wire, and FIG. 7B is an explanatory view of a telescopic cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bypass device 2 Breaker 3 Bypass wire 4 Wire clamp 5 Integrated power meter 5a Machine frame 6 Input side wire 6a Conductive wire 7 Output side wire 7a Conductive wire 10 Clamp main body 11 Main body part 12 Hook part 13 Square hole 14 Screw insertion hole 15 Terminal Fixing hole 16 Electric wire mounting hole 20 Nut member 21 Lid member 22 Screw hole 23 Clamp screw 24 Sharp part 25 Operating part 26 Electrode terminal 27 Fixing screw 30 Cover member 31 Vertical wall part 32 Vertical wall part 33 Bottom wall part 34 Long hole 35 Screw Member 36 Notch 37 Movement restricting part 40 Telescopic cover

Claims (6)

[Claims] 1. A wire clamp provided at an end of a second wire for electrically connecting a second wire to a middle portion of the first wire, wherein the hook portion engages with a middle portion of the first wire. A nut member made of a conductive material incorporated in the clamp body with the screw hole facing the hook portion side, the nut member being electrically connected to the second electric wire; and the screw hole of the nut member A clamp screw made of a conductive material that is screwed into
An electric wire clamp comprising: a clamp screw having a sharp end provided at a distal end thereof, which can be electrically connected to the first electric wire through an insulating coating of the first electric wire engaged with the hook portion. 2. The electric wire clamp according to claim 1, wherein a cover member made of an insulating material for covering at least a connection portion between the first electric wire and the clamp screw is provided on the clamp body so as to be switchable between a use position and a retracted position. 3. The electric wire clamp according to claim 2, wherein a movement restricting portion for restricting the movement of the first electric wire hooked on the hook portion is formed on the cover member. 4. A bypass device, wherein the wire clamp according to claim 1 is provided at both ends of a second wire as a bypass wire. 5. A telescopic cover made of an insulating material elastically deformable in the length direction of the first electric wire, which is sheathed in a middle portion of the first electric wire from the side, wherein a machine frame of a device to be bypassed and an electric wire clamp are provided. The bypass device according to claim 4, further comprising a telescopic cover that is attached to the first electric wire in a compressed state between the first electric wire and the first electric wire, and when the first electric wire is removed from the bypass target device, can be extended to cover the conductive wire of the first electric wire. . 6. The bypass device according to claim 5, wherein an engagement portion is formed at one end of the telescopic cover so as to engage with a cover member of an electric wire clamp to restrict the telescopic cover from falling off from the first electric wire.