JP3418925B2 - Electric wire clamp and bypass device using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a method for replacing an integrating wattmeter used in general households, factories, etc., a bypass device having a bypass electric wire having a breaker in the middle thereof and electric wire clamps provided at both ends of the bypass electric wire. Using this bypass device, replace the integrating wattmeter with a new one while electrically connecting the input side electric wire and the output side electric wire of the integrating wattmeter, and remove the bypass device after replacing the integrating wattmeter. A replacement method in which a damaged portion of the insulation coating of the input / output wires is filled with an adhesive or the like to prevent electric leakage is widely used because the integrated wattmeter can be replaced without interruption.

As a wire clamp for the bypass device, a clamp body having a hook portion for engaging the input side wire and the output side wire, and a clamp screw made of a conductive material and facing the hook portion and screwed into the clamp body. And
There has been put into practical use a clamp screw having a sharpened tip and a connector for connecting the base end of the clamp screw and the end of the bypass wire. When attaching the electric wire clamp to the input / output electric wire, the clamp screw is tightened in a state where the hook portion is engaged with the input / output electric wire, and the sharp portion is broken while breaking the insulating coating of the input / output electric wire. Insert the wire clamp into the wire, mechanically and electrically connect the wire clamp to the input / output wire, and then connect the bypass wire to the base end of the clamp screw via the connector to attach the wire clamp to the input / output wire. It is attached.

[0004]

By the way, in the bypass device having the electric wire clamp as described above, at the time of replacement of the integrated wattmeter, the fixing work of 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, fixed work, on the input side and the output side respectively, and in the case of three-phase AC,
Since it was necessary to perform the same work 6 times in total for 3 sets of electric wires, the work was very complicated. Also, since the bypass device is composed of three parts, a bypass wire and two wire clamps, it is necessary to transport a total of nine parts to the construction site when replacing the three-phase AC integrating wattmeter. Yes, parts management and transportation were very complicated.

An object of the present invention is to provide an electric wire clamp and a bypass device using the electric wire clamp which can remarkably improve the attachability and the detachability of the electric wire.

[0006]

The electric wire clamp according to the present invention is an electric wire clamp provided at the end of the second electric wire for electrically connecting the second electric wire to the middle of the first electric wire. A clamp body having a hook portion that engages with the middle portion of the first electric wire, and a nut member made of a conductive material that is incorporated in the clamp main body with the screw hole facing the hook portion. A nut screw electrically connected to the nut member, and a clamp screw made of a conductive material that is screwed into a screw hole of the nut member and is capable of projecting and retracting toward the hook portion side. The first electric wire engaged with the hook portion. Through the insulation coating of the first
Movement of the clamp screw with a sharp tip at the tip that can be electrically connected to the wire and the first wire hooked on the hook
It has a movement regulation part that can regulate the
It is provided so that the position can be switched between the storage and retracted positions, and
At least the connection part between the first electric wire and the clamp screw
Cover it and hook it on the hook with the movement restrictor.
A cover made of an insulating material that regulates the movement of the first electric wire
And a member .

In this electric wire clamp, the clamp screw can be screwed into the nut member made of a conductive material, and the second electric wire can be electrically connected and fixed to the nut member in advance. Therefore, at the construction site, simply by operating the clamp screw, 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 the operation of the clamp screw should be performed by an electric tool or the like. Therefore, the attachability and detachability of the wire clamp to the first wire can be significantly improved. Further, 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 the parts management becomes easy.

Further, it provided at least a to possible position switching first wire and the retracted position to the use position the cover member made of an insulating material covering the connecting portion between the clamping screw on the clamp body
Therefore, it is possible to prevent inadvertent electric shock, short circuit, etc. by covering the connecting portion between the first electric wire and the clamp screw without deteriorating the attachability and detachability of the electric wire clamp to the first electric wire. In addition , the cover member is formed with a movement restricting portion that restricts the movement of the first electric wire hooked on the hook portion.
Therefore , when the clamp screw is inserted into the first electric wire, it is possible to prevent the first electric wire from being accidentally dropped from the hook portion.

A bypass device according to the present invention is defined in claim 1.
The wire clamp of serial placement but on the opposite ends of the second wire as a bypass wire. In the bypass system, because of the use of wire clamp mounting serial to claim 1,
The bypass device can be remarkably mounted and removed, and the replacement work of the bypassed device such as the integrating wattmeter can be remarkably improved.

Here, an expandable cover made of an insulating material which is elastically deformable in the length direction of the first electric wire and which is laterally sheathed in the middle portion of the first electric wire, and is a machine frame of the bypassed device and the electric wire. When the first electric wire is attached in a compressed state between the clamps and the first electric wire is removed from the bypassed device,
It is preferable to provide an expandable cover that can be extended to cover the conductive wire of the first electric wire. That is, when replacing a bypassed device such as an integrated wattmeter, after electrically connecting the input-side first electric wire and the output-side first electric wire connected to the bypassed device by the bypass device, the bypassed device is connected. The first electric wire will be extracted from and replaced with a new one. At this time, however, the conductive wire is exposed at the end of the extracted first electric wire, which is in a dangerous state. According to the present invention, when the bypassed device is attached to the first electric wire, the expansion cover is attached to the first electric wire in advance between the machine frame of the bypassed device and the electric wire clamp, so that the first electric wire is extracted from the bypassed device. When the elastic cover is stretched, the conductive wire exposed at the end of the first electric wire is covered by the elastic cover, so that the conductive wire can be prevented from being exposed and work safety can be further improved. become.

When such an expansion cover is provided, one end of the expansion cover is engaged with a cover member of the electric wire clamp to form an engagement portion for restricting the expansion cover from falling off from the first electric wire. Preferably.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION 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 in the middle.
And an electric wire clamp 4 provided at both ends of the bypass electric wire 3, and as shown in FIG. 1, for example, three input side electric wires 6 and three output side electric wires 6 connected to an integrating wattmeter 5 as a bypassed device. By electrically connecting each of the electric wires 7 and bypassing the integrated wattmeter 5 to supply power from the input side electric wire 6 to the output side electric wire 7, the integrated wattmeter 5 can be replaced without causing a power outage on the output side. It is for The bypass electric wire 3 corresponds to the second electric wire, and the input side electric wire 6 and the output side electric wire 7 correspond to the first electric wire. Further, the bypass electric wire 3 and the breaker 2 interposed therein have a known structure.

The wire clamp 4 will be described with reference to FIG.
~ As shown in FIG. 6, a rectangular parallelepiped main body 11 and a main body 1
1. A clamp body 10 having a projecting hook portion 12 on the left side of 1 and made of a synthetic resin material having excellent insulating properties such as nylon resin is provided, and the tip portion of the hook portion 12 and the body portion 11 are provided. An opening of the hook portion 12 is formed downwardly between them. Inside the main body portion 11, a square hole 13 whose lower surface is open, and a screw insertion hole 14 which penetrates the main body portion 11 and the square hole 13 and is opened toward the electric wires 6 and 7 locked by the hook portion 12 And a terminal fixing hole 15 extending from the front surface side of the main body portion 11 to the square hole 13, and an electric wire mounting hole 16 arranged on the right side of the main body portion 11 in parallel with the screw insertion hole 14 and opening into the terminal fixing hole 15. Has been done.

A nut member 20 made of a conductive material is non-rotatably attached to the inner portion of the square hole 13, 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 fused and fixed by heat sealing, ultrasonic sealing, or the like, and screw holes 22 are formed in the nut member 20 so as to communicate with the screw insertion holes 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, the nut member 2
It is also possible to integrate 0 into the clamp body 10 by insert molding when the clamp body 10 is molded.

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 the screw hole 22 of the nut member 20. At the tip of the clamp screw 23, a sharp portion 2
4 is formed, and at the base end portion of the clamp screw 23, an operation portion 25 including a minus groove, a plus groove, a hexagonal groove and the like that can be rotated by an electric tool is formed. Then, by hooking the input side electric wire 6 or the output side electric wire 7 on the hook portion 12 and screwing the clamp screw 23 with an electric tool, the sharpened portion 24 is hooked on the hook portion 12 by the input side electric wire 6 or the output side. It is configured such that it penetrates through the insulating coating of the electric wire 7 and is inserted into the electric wire, and the clamp screw 23 is electrically connected to the electric wire.

An electrode terminal 26 is fixed to the end of the bypass electric wire 3, the end of the bypass electric wire 3 including the electrode terminal 26 is attached to the electric wire mounting hole 16, and the conductive portion of the bypass electric wire 3 goes out of the clamp body 10. It is configured not to be exposed. The electrode terminal 26 has a fixing screw 2 in the terminal fixing hole 15.
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 covered with a cover member 30 made of an insulating material having the following structure in order to prevent electric shock, short circuit and the like. As shown in FIGS. 3 to 6, the cover member 30 is configured 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 vertical wall portions 31 and 32. Long holes 34 extending in the left-right direction are formed in the wall portions 31 to 33, respectively, and the cover member 30 is retracted to the clamp body 10 via screw members 35 attached to these long holes 34, and retracted as shown by solid lines in FIG. It is assembled so as to be movable between the position and the use position shown in phantom in FIG.

A notch 36 through which the input side electric wire 6 or the output side electric wire 7 is inserted is formed on the left side of the front and rear vertical wall portions 31, 32 in the use position, and the cover member 30 is moved to the use position. The joint portion 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 or short circuit. Has been done. However, in this embodiment, the cover member 30 is slid to cover the conductive portion, but it may be covered by rotation or rotation. Also, the cover member 3
A portion of 0 that is lower than the cutout portion 36 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 when 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 in the front-rear direction to prevent the electric wire hooked on the hook portion 12 from being accidentally dropped from the opening portion of the hook portion 12, and at the time of inserting the clamp screw 23. Since the electric wire is fixed so as not to escape, the sharpened portion 24 of the clamp screw 23 can be reliably inserted into the central portion of the electric wire.

As shown in FIG. 7, the bypass device 1 is attached to the integrating wattmeter 5 together with the expansion / contraction cover 40 formed of a bellows-shaped cylindrical body that can be fitted on the electric wires 6 and 7. The expandable cover 40 is made of synthetic rubber or the like having insulation and elasticity, and in a state where the electric wires 6 and 7 are connected to the integrating wattmeter 5,
One portion in the circumferential direction is cut in the length direction over the entire length so that the wires 6 and 7 can be mounted from the side. The bellows groove portion of the expandable cover 40 is formed in a size that allows the notch 36 of the cover member 30 to be inserted therethrough, and the expandable 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. Stretchable cover 40
The cover member 30 is moved to the use position while the cutout portion 36 is engaged with one end of the cutout portion 36, and the upper edge portion and the lower edge portion of the cutout portion 36 are engaged with the stretchable cover 40.
0 is fixedly held by the electric wire clamp 4.

When attaching the electric wire clamp 4 to the electric wires 6 and 7, as shown in FIG. 7A, the cover member 30 of the electric wire clamp 4 is previously engaged with one end of the expandable cover 40, The expansion cover 40 is fixed to the electric wire clamp 4, and the expansion cover 40 is externally compressed to the electric wires 6 and 7 between the electric wire clamp 4 and the machine frame 5a of the integrated wattmeter 5 to replace the integrated wattmeter 5. For this reason, when the electric wires 6 and 7 are pulled out from the integrated wattmeter 5, the expansion cover 40 is extended to cover the conductive wires 6a and 7a of the electric wires 6 and 7 as shown in FIG. 7B. Will be done.
However, the expandable cover 40 may have a structure other than the bellows.

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

Next, the electric wire clamp 4 is moved to the machine frame 5a side of the integrated wattmeter 5 along the electric wires 6 and 7, the expansion cover 40 is compressed as shown in FIG. The screw 23 is screwed in with an electric 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 to each other. The clamp 4 is fixed to the electric wires 6 and 7. This work is sequentially performed on the six electric wire clamps 4, and the three electric power input wires 6 and the three electric power output wires 7 are connected via the three bypass devices 1 so that the integrated wattmeter 5 is bypassed. Are electrically connected to each other. However, one bypass device 1 is attached to the input-side electric wire 6 and the output-side electric wire 7, and the clamp screw 23 is screwed in to electrically connect the input-side electric wire 6 and the output-side electric wire 7 before the next bypass. 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 removed from the integrated wattmeter 5, the input side electric wire 6 and the output side electric wire 7 are connected to the new integrated wattmeter 5, and the integrated 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 integrated wattmeter 5, as shown in FIG.
As shown in FIG.
And the conductive wires 6a, 7a of the output side electric wire 7 are the expansion and contraction cover 40.
Thus, the electric wires 6a and 7a are prevented from electric shock and short circuit due to contact with other objects.

Next, the six electric wire clamps 4 opposite to the above
Loosen the clamp screw 23 of the
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 the occurrence of electric leakage, etc., to the insulation coating portion of the electric wire damaged by the insertion of the sharpened portion 24 of the clamp screw 23,
The replacement work of the integrated wattmeter 5 is completed by filling the filler or the adhesive made of an insulating material.

In this embodiment, the present invention is applied to the bypass device 1 used when replacing the integrated wattmeter 5, but the bypass device 1 can also be used when replacing other electric equipment. Further, the electric wire clamp 4 can be used as an electric wire connecting tool for various electric devices other than the integrating wattmeter 5.

[0026]

According to the electric wire clamp of the present invention, the first electric wire and the second electric wire can be electrically connected or the first electric wire and the second electric wire can be electrically connected only by operating the clamp screw. Further, since the clamp screw can be operated with an electric tool or the like, the attachability and detachability of the wire clamp with respect to the first wire can be markedly improved. Also, with the wire clamp attached to the second wire, it can be transported to the construction site.
The transportability of the wire clamp can be improved and the parts management becomes easy.

Further, it provided at least a to possible position switching first wire and the retracted position to the use position the cover member made of an insulating material covering the connecting portion between the clamping screw on the clamp body
Therefore , it is possible to prevent inadvertent electric shock, short circuit, or the like at the connection portion between the first electric wire and the clamp screw without deteriorating the attachability and detachability of the electric wire clamp to the first electric wire. In addition , the cover member is formed with a movement restricting portion that restricts the movement of the first electric wire hooked on the hook portion.
Therefore, when the clamp screw is inserted into the first electric wire, the first electric wire can be prevented from being accidentally dropped from the hook portion, and the insertability of the clamp screw into the first electric wire and the safety at the time of insertion can be improved. .

According to the bypass device according to the invention, because of the use of wire clamp mounting serial to claim 1, considerably enhances mountability and detachment of the bypass device, the bypass, such as watt-hour meter Device replacement work can be significantly improved.

Here, if a telescopic cover made of an insulating material that is elastically deformable in the lengthwise direction of the first electric wire is provided in the middle of the first electric wire from the lateral side, the bypassed device is set to the first position.
By attaching the expansion cover to the first electric wire in advance between the machine frame of the bypassed device and the electric wire clamp when attaching to the electric wire, the expansion cover extends when the first electric wire is pulled out from the bypassed device, By configuring the conductive wire exposed at the end of the first electric wire to be covered with the expandable cover, it is possible to prevent the conductive wire from being exposed and further improve work safety.

Further, if the engaging portion for engaging the cover member of the electric wire clamp with one end of the expandable cover and restricting the expansion of the expandable cover from the first electric wire is formed, the expandable cover can be provided without increasing the number of parts. It can be fixed to the cover member of the wire clamp.

[Brief description of drawings]

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

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

[Figure 3] Front view of the wire clamp

[Figure 4] Bottom view of wire clamp

[Fig. 5] Vertical sectional view of the wire clamp

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

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

[Explanation of symbols]

1 Bypass device 2 Breaker 3 bypass wire 4 wire clamp 5 Integrated wattmeter 5a Machine frame 6 Input side wire 6a Conductive wire 7 Output side wire 7a Conductive wire 10 Clamp body 11 Body section 12 Hook 13 Square hole 14 screw insertion hole 15 terminal fixing hole 16 Wire mounting hole 20 Nut member 21 Lid member 22 screw hole 23 clamp screw 24 Sharp part 25 Operation part 26 electrode terminal 27 fixing screw 30 cover member 31 vertical wall portion 32 Vertical wall part 33 Bottom wall part 34 Long hole 35 Screw member 36 Notch 37 Movement restriction part 40 telescopic cover

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mitsuaki Nomoto 2-9-32 Taishibashi, Asahi-ku, Osaka (72) Inventor Takayuki Hino 3-18-12A-202 Nagaihito, Sumiyoshi-ku, Osaka (72) Inventor Yamashita Tsutomu Higashiosaka City 4-4-3 Higashikonoike-cho (56) Reference JP 2000-201412 (JP, A) JP 8-75791 (JP, A) JP 7-335294 (JP, A) JP Flat 11-30633 (JP, A) JP 11-262155 (JP, A) JP 6-124618 (JP, A) Actually open 59-3732 (JP, U) Actually open 2-18277 (JP , U) Registered utility model 3008742 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01R 4/24 H01R 4/36 H01R 4/70 H02G 1/02 309 G01R 11/00 H02G 15/08 G01R 11/04

Claims (4)

(57) [Claims] 1. A wire clamp provided at an end portion of a second electric wire for electrically connecting a second electric wire to a middle portion of the first electric wire, the hook portion engaging with the middle portion of the first electric wire. A nut body made of an electrically conductive material, the nut body being electrically connected to a second electric wire, the clamp body having a screw body facing the hook portion side, and a nut member electrically connected to the second electric wire; It is a clamp screw made of a conductive material that can be screwed into and out of the hook part side,
A clamp screw having a sharpened portion at the tip portion which penetrates the insulation coating of the first electric wire engaged with the hook portion and can be electrically connected to the first electric wire, and the movement of the first electric wire hooked on the hook portion. Can be regulated
It has a movement restriction part, and the use position and the retracted position on the clamp body
It is possible to switch the position between the and
Both cover the connection between the first wire and the clamp screw.
Of the first electric wire hooked on the hook part by the movement restricting part
An electric wire clamp , comprising: a cover member made of an insulating material that restricts movement . 2. A bypass for the electric wire clamp according to claim 1.
Characterized by being provided at both ends of the second electric wire as an electric wire
Bypass device. 3. A first electric wire is laterally provided on the middle portion of the electric wire.
From an insulating material that is elastically deformable in the length direction of the first wire
It is an expandable cover that is a device frame and electric wire of the bypassed device.
It is attached to the first wire in a compressed state between the clamps,
1 When the electric wire is removed from the bypassed device,
Contractor with an expandable cover that can cover the conductive wire of the first electric wire
The bypass device according to claim 2. 4. An electric wire clamp at one end of the expandable cover.
Of the expansion cover from the first wire by engaging with the cover member of
The viper according to claim 3, wherein an engagement portion is formed to regulate the falling off.
Device.