JP3043753B1 - Work cover device for watt hour meter - Google Patents

Abstract

An object of the present invention is to provide a work cover device for a watt hour meter that can ensure the safety of workers and prevent a decrease in work efficiency. SOLUTION: A protective cover body 1 of a work cover device 10 is provided.
2 is a connection unit 24 having terminals 26a to 26c and 28a to 28c to which the power lines 25a to 25c and 27a to 27c are connected, and the power supplied via each power line is converted based on a moving magnetic field generated by a load. Measure and accumulate,
The meter main body 23 of the watt-hour meter 22 having the meter main body 23 for obtaining and displaying the electric energy is mounted using the locking means 14 and 15 to cover the meter main body 23 at least from the front side. Further, the connecting portion cover body 18 is
The work can be carried out using a tool or the like through the work holes 16a to 16c and 17a to 17c which are mounted using the terminals 9 and 20 and individually face the terminals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work cover device to be attached to a watt-hour meter during a work for replacing the watt-hour meter.

[0002]

2. Description of the Related Art The amount of power supplied from a power supply source such as a generator of a power company to a power consuming device installed at a power demand destination such as a general house is determined by a power supply power line through which power from the power company is led, It is measured by a watt-hour meter interposed between the power consumption destination and the load power line for guiding the power to the power consuming device. The work of replacing the watt-hour meter requires the terminal connected to the watt-hour meter on the power line to minimize the interruption of power supply to the power consuming equipment.
This is performed in a so-called live state electrically connected to a power supply source.

[0003] In replacing the watt-hour meter, the power supply power line in a live state is handled, so that the worker wears a disaster prevention surface 1 as shown in FIG. The disaster prevention surface 1 is made of a light-transmitting material, and has a cover portion 2 curved along a substantially cylindrical surface, and a substantially U-shaped frame portion 3 fixed to an upper end portion of the cover portion 2. As shown in FIG. 17, the disaster prevention surface 1 is attached to a safety cap 4 worn by an operator when performing an electric construction work such as a replacement work of the watt-hour meter, using a mounting claw 5, and the work is performed. Sometimes the cover part 2 is arranged so as to be lowered from the front part of the security cap 4, and is used in a state of covering the worker's face. By wearing such a disaster prevention surface 1 and covering the face with the translucent cover 2, even if a short circuit accident occurs and an arc is generated during handling of the power supply line, the face is removed from the arc. Can be protected. Furthermore, even if the watt-hour meter is damaged in the event of a short-circuit accident, the face can be protected from fragments of the watt-hour meter.

[0004]

DISCLOSURE OF THE INVENTION Disaster prevention surface 1 as described above
Since the worker wears on the head and the cover 2 is curved, the worker may feel bad due to the lens effect, diffuse reflection, or the material of the cover 2. Also, when the worker wears the disaster prevention surface 1, the cover 2
Is disposed near the face, and the cover 2 may be fogged due to the exhalation of the operator, especially in winter. When such a problem occurs, the operator must take a break or wipe off water droplets that cause fogging, which lowers the working efficiency.

[0005] In addition, if the worker does not understand the shape and size of the disaster prevention surface 1 incompletely, when working in a narrow place and in a dark place, the disaster prevention surface 1 hits surrounding articles and the like, which hinders the work. Work efficiency is reduced. When the disaster prevention surface 1 hits the surrounding articles or the like in this way, the surface of the cover portion 2 is scratched and the visibility is deteriorated.
In addition, the worker is more likely to hit surrounding articles and the like, which further reduces the work efficiency.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a watt-hour meter cover device which can ensure the safety of workers and prevent a decrease in work efficiency.

[0007]

According to the first aspect of the present invention, there is provided a connection portion having a plurality of terminals to which a plurality of power supply power lines and a plurality of load power lines are individually detachably connected, and a movement generated by a load. The number of rotations of the disk rotated by the magnetic field is measured and integrated, the integrated value is displayed as a power amount toward the front side, and at least the meter main body of the watt hour meter including the meter main body provided with the connection portion is provided. A protective cover body detachably mounted from the front side thereof and covering the meter main body from the front side, and locking means provided on both sides of the protective cover body to lock the protective cover body to the meter main body. A work cover device for an electricity meter.

According to the present invention, by connecting each power supply power line and each load power line to each terminal of the connection portion, based on the load associated with the operation of the power consuming equipment connected to the load power line by the meter body. The watt-hour meter, which can be obtained by integrating the power consumption and displaying the power consumption, has a protective cover that is locked to the meter body by locking means provided on both sides of the protective cover, and is detachably attached. It can be attached to cover the meter body from the front side. If such a protective cover is attached to the meter body when replacing the watt-hour meter as described in connection with the prior art, for example, the meter body may be damaged due to a short circuit accident or the like. Even so, the worker can be protected from the debris. Further, even if the meter body explodes due to a short circuit accident or the like, it is possible to protect the operator from the flame and blast generated at that time.

Further, since the protective cover for protecting the worker is attached to the meter main body as described above, the face of the worker is covered with a curved and light-transmitting member as in the prior art. There is no. Therefore, it is possible to prevent a decrease in work efficiency due to deterioration of visibility caused by using a disaster prevention surface as in the conventional technology, and also possible to prevent an injury or the like caused by a worker hitting a surrounding object or the like. The safety can be further improved. Moreover, since the protective cover is locked to the meter body by the locking means, there is no need for the operator to press the protective cover so as not to come off the meter body, and the worker can use both hands for other work. it can.

According to a second aspect of the present invention, in the configuration of the first aspect, a through hole is formed in the protective cover body, avoiding a front portion thereof.

According to the present invention, even if an explosion of the meter body occurs due to a short circuit accident or the like during the replacement work of the watt hour meter, the blast accompanying the explosion is protected from the through hole by the protective cover member. To prevent the protective cover from coming off the meter body. In addition, since the through hole for releasing the blast is formed avoiding the front part, the blast does not blow toward the operator.

According to a third aspect of the present invention, in the configuration of the first or second aspect of the present invention, the protective cover is provided on the inner surface of the protective cover while the protective cover is mounted on the meter main body. It is characterized in that a spacer is provided which resiliently contacts the surface.

According to the present invention, the spacer is provided on the inner surface of the protective cover, and when the protective cover is mounted on the meter main body, the spacer resiliently comes into contact with the outer surface of the meter main body. When the cover body is attached, it is possible to prevent the protective cover body from being shaken and displaced with respect to the meter main body. Therefore, it is possible to prevent the protective cover body from being undesirably displaced during the operation, which does not hinder the operation. Further, by providing such a spacer, it is possible to absorb and attach the difference in shape and dimension to a plurality of types of watt-hour meters having different shapes and dimensions depending on the manufacturer and type by deforming the spacer.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects of the present invention, the protective cover is mounted on an upper part of the protective cover in a state where the protective cover is attached to the meter body. A fixing means for pressing the upper part of the meter main body from above to fix the protective cover body to the meter main body is provided.

According to the present invention, the fixing means is provided on the upper part of the protective cover body, and the upper part of the meter body is pressed from above by the fixing means in a state where the protective cover body is mounted, so that the protective cover body is fixed to the meter main body. Displacement can be prevented and firmly fixed. It is possible to prevent the protective cover body from being undesirably displaced during the operation, which does not hinder the operation. Further, by providing such a fixing means, it is possible to absorb the difference of the shape and the size by the fixing means and mount it on a plurality of types of watt-hour meters having different shapes and dimensions depending on the manufacturer and the type.

According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, a light-transmitting area for confirming the electric energy of the meter main body is provided on a front portion of the protective cover body. Is provided.

According to the present invention, since the light-transmitting area is provided in the front portion of the protective cover, the power amount displayed by the meter main body during an operation such as replacement of the meter main body of the watt hour meter. For example, the user can check the meter body without removing the protective cover body, thereby improving the convenience.

According to a sixth aspect of the present invention, in the configuration of the first aspect of the present invention, a part of the protective cover is detachably provided.

According to the present invention, since a part of the protective cover body is detachably provided, the protective cover body is detached and disposed at a different position. The attachment form of the cover body can be appropriately changed, and convenience can be improved.

According to a seventh aspect of the present invention, there is provided a connection portion having a plurality of terminals to which a plurality of power supply power lines and load power lines are individually detachably connected, and a disk rotated by a moving magnetic field generated by a load. The number of rotations is measured and integrated, and the integrated value is displayed as an integrated watt-hour meter toward the front side, and is detachably attached to the connection portion of the watt-hour meter including the meter body provided with the connection portion. A plurality of working holes that are individually opened to face the respective terminals of the connection portion. The connection portion cover body includes an insulating member, and holding means for holding the connection portion cover body at the connection portion. This is a work cover device for a watt hour meter.

According to the present invention, by connecting each power supply line and each load power line to each terminal of the connection portion, the meter main body is connected to the load power line based on the load accompanying the operation of the power consuming equipment connected to the load power line. In a watt hour meter capable of calculating and integrating the power consumption and displaying the power consumption, the connecting portion cover can be detachably held on the connecting portion by a holding means. The connection portion cover body is made of an electrically insulating material, and is formed with a plurality of working holes that individually face each terminal and is opened while being held by the connection portion. For example, when exchanging a watt-hour meter as described in connection with the prior art, by holding at the connection, the terminal of each power line can be directly or directly connected to a terminal other than the corresponding terminal to which it should be connected. Can be prevented from indirectly coming into contact via tools used in the equipment and approaching even if they do not come into contact, preventing arcing and damage to the meter body. There is no need to use the prepared disaster prevention surface.

Further, since the connecting portion cover body for preventing the above-mentioned short circuit accident or the like is attached to the connecting portion as described above, it is a translucent member having a curved worker's face as in the prior art. It will not be covered. Therefore, it is possible to prevent a decrease in work efficiency due to deterioration of visibility caused by using a disaster prevention surface as in the conventional technology, and also possible to prevent an injury or the like caused by a worker hitting a surrounding object or the like. The safety can be further improved. In addition, since the connection cover body is held at the connection part by the holding means, there is no need for the operator to press the connection part cover body so as not to come off from the connection part, and the worker can use both hands for other work. .

[0023]

FIG. 1 is a perspective view showing work cover devices 10 and 11 according to an embodiment of the present invention. Each work cover device (hereinafter, sometimes simply referred to as “cover device”) 10, 11 is, for example, a three-phase three-wire system and a single-phase three-wire system.
The watt-hour meter 22 is used by being attached to the wire-type watt-hour meter 22 at the time of work such as replacement work of the watt-hour meter 22. In the present embodiment, a three-phase three-wire watt hour meter will be described as an example. Watt hour meter 2
Reference numeral 2 denotes a normal weather-resistant watt-hour meter, for example, a meter main body 23 and a connection portion 2 provided at a lower portion of the meter main body 23.
And 4.

In the connection portion 24, a plurality of terminals 26a to 26c and 28a to 28c, specifically, a plurality of terminals according to the present embodiment, are provided in a space separated from each other by a partition wall 200 made of a material having electrical insulation. Then three power supply lines 2
Power terminals 26a, 26b, 26c to which the terminals 5a, 25b, 25c are individually detachably electrically connected, and a plurality of, in this embodiment, three load power lines 27a, 27c.
b and 27c respectively have load terminals 28a, 28b and 28c that are detachably and electrically connected to each other. Each of the power supply lines 25a to 25c is electrically connected to a power supply source such as a generator of a power company.
a to 27c are connected to power consuming devices installed at power demand destinations such as ordinary houses. Hereinafter, each power supply line 25
a to 25c, the power supply terminals 26a to 26c, the load power lines 27a to 27c, and the load terminals 28a to 28c are collectively referred to by omitting the suffixes a to c.

The meter body 23 is connected to each terminal 2 of the connection section 24.
The amount of power supplied from the power supply source to the power consuming device via the power lines 25 and 27 connected to the power supply devices 6 and 28, respectively, is measured by measuring and integrating the power. More specifically, the meter main body 23 is
The movement generated by the power load accompanying the operation of the power consuming device, that is, the current generated by the current flowing through the power consuming device, in the housing 40 having a substantially rectangular parallelepiped shape configured by detachably attaching the lid body 97 to the power consuming device 8. There is means for measuring the number of revolutions of the disk rotated by the magnetic field as electric power, and the measured number of revolutions is integrated by the integrating means, and the integrated value is obtained as the electric energy. The measured electric energy is displayed toward the front using, for example, a display unit having a plurality of rotating drums on which numbers are indicated. The lid 97 of the housing 40 is
For example, it is made of translucent glass, and is configured so that the amount of power can be checked through the lid 97.

When the watt-hour meter 22 is used for a certain period of time, specifically, ten years, it is replaced with a newly-prepared or newly manufactured watt-hour meter. The replacement operation of the watt-hour meter 22 is performed in order to minimize the interruption of the supply of power to the power consuming devices.
The terminal connected to the watt hour meter 22 is in a so-called live state electrically connected to the power supply source. When work such as the replacement work of the watt-hour meter 22 is performed, the work cover devices 10 and 11 of the present invention are connected to the watt-hour meter 22.
Attached to.

The work cover device 10 is detachably attached to the meter main body 23 of the watt-hour meter 22 from the front side thereof, and protects the meter main body 23 from the front side (obliquely right lower side in FIG. 1). 12 and locking means 14 and 15 provided on both sides of the protective cover body 12 to lock the protective cover body 12 to the meter main body 23. The work cover device 11 is detachably attached to the connection portion 24 of the watt-hour meter 22 and has a plurality of work holes 16a, 16b, 16c; ,
A connection portion cover body made of an electrically insulating material on which the connection portions are formed, and holding means for holding the connection portion cover at the connection portion. Hereinafter, when the working holes 16a to 16c; 17a to 17c are collectively referred to, the suffixes a to c are omitted.

FIG. 2 is a front view showing the work cover device 10, FIG. 3 is a right side view showing the work cover device 10, and FIG. 4 is a plan view showing the work cover device 10. 5 is a bottom view showing the work cover device 10,
FIG. 6 is a rear view showing the work cover device 10. FIG.
The protective cover body 12 of the work cover device 10 is made of metal, and the rear side is opened by the front wall 30, the upper plate 31, the lower plate 32, and the left and right side walls 33, 34. Main body 35 formed substantially in a rectangular parallelepiped shape
And a front plate 36 made of a light-transmitting synthetic resin and fixed to the front wall 30 of the main body 35.

The main body 35 is formed by cutting, bending and welding a steel plate having a thickness of 1 mm, for example. In the front wall 30 provided on the front side, a rectangular window hole 41 inserted in the thickness direction is formed in the center portion, and in the upper plate 31 provided on the upper side, a rectangular window hole 41 inserted in the thickness direction is formed.
Two through holes 37, 38 are formed at intervals in the left-right direction, and rectangular cutouts 39, 40 that open to the rear side are formed in lower portions of the side walls 33, 34. .
The aperture ratio of the front wall 30 including the region where the window hole 41 is formed by the window hole 41 is about 35%, and the aperture ratio of the through holes 37 and 38 to the entire upper surface including the upper plate 31 is: It is about 18.5%. On the lower plate 32 provided on the lower side, a protective sheet 60 made of an electrically insulating material such as rubber or a synthetic resin is stuck over the entire surface facing the lower side. The front plate 36 is a rectangular plate made of, for example, polycarbonate having a thickness of 5 mm having fire resistance, flame retardancy, and impact resistance, and is provided on the rear side of the front wall 30 so as to close the window hole 41. For example, at four positions at each corner, the screw member 42 and the nut member 4
3 and is detachably provided on the front wall 30 and can be replaced when it becomes difficult to perform a check operation using the through-hole region 74 described below due to dirt or damage.

Each side wall 33, 34 located on both sides of the protective cover body 12 is provided with a locking means 14, 15 at a substantially central position in the vertical direction. Each of the locking means 14 and 15 has a similar configuration to each other, and is provided symmetrically with respect to the protective cover body 12.
Will be described in detail, and as for the locking means 14,
Corresponding parts have the same reference characters allotted, and description thereof will not be repeated.

The locking means 15 has a support piece 45 fixed to the side wall 34 and a locking piece 46 supported by the support piece 45 so as to be angularly displaceable about an axis L1 extending in the vertical direction. The support piece 45 is, for example, a substantially C-shaped member formed by bending a steel plate. The support piece 45 is arranged such that both end portions protrude from the side wall 34 to the outside of the protective cover body 12. Is fixed to the outer surface of the side wall 34 by, for example, welding. Locking piece 46
Is a longitudinal member formed by, for example, bending a steel plate, and is bent in one of the thickness directions following a flat rectangular base portion 48 and one end portion in the longitudinal direction of the base portion 48. Hook-shaped portions 49 bent toward the other end in the longitudinal direction, and support portions 50 and 51 connected to both side portions arranged perpendicular to one end of the base and bent in one direction in the thickness direction, respectively.
And

The locking piece 46 is supported by the support base 45 via the support shaft 52 by inserting the support shaft 52 in common with both ends of the support base 45 through the support portions 50 and 51 together with the both ends of the support base 45. Are supported so as to be angularly displaceable about an axis L1 which is an axis of the axis. The support shaft 52 may be realized by, for example, combining a bolt member and a nut member.

The support base 45 is fixed to an end on the rear side of the side wall 34, and a locking piece 46 fixed to the support base 45.
The hook-shaped portion 49 is provided such that the hook-shaped portion 49 protrudes rearward from the side wall 34 and the hook-shaped portion 49 is bent toward the other side wall 33. Further, the locking means 15 is provided on the support base 4.
5. In addition to the locking piece 46 and the support shaft 52, a torsion coil spring 53 is provided. The torsion coil spring 53 is provided in a state where the support shaft 52 is inserted.
The hook portion 49 applies a spring force in the direction of angular displacement so as to approach the side wall 33. The locking piece 46 can be angularly displaced against the spring force of the torsion coil spring 53 by pressing the other end of the base 48 in the longitudinal direction toward the side wall 34 with a finger, for example.

The work cover device 10 includes a spacer 5 in addition to the protective cover 12 and the locking means 14 and 15.
5, 56, a fixing means 57 and a partition member 58. The spacers 55 and 56 are longitudinally rectangular parallelepiped members made of a resilient material such as sponge, for example. The spacers 55 and 56 are inside the protective cover body 12, more specifically, the front wall 30 and the side walls 33 and 34. Inside the corner where
It is provided between the upper plate 31 and the lower plate 32, respectively.

The fixing means 57 is provided on the upper plate 31 of the protective cover body 12, and as shown in an enlarged manner in FIG. 7, a bolt member 64 and two nut members 65, 67 screwed with the bolt member 64. And The bolt member 64 and the nut member 65 are made of, for example, polytetrafluoroethylene (trade name: Teflon), and the nut member 67 is made of, for example, brass (brass). An insertion hole 70 through which a bolt member 64 can be loosely inserted is formed in the center of the upper plate 31, and a nut member 67 is arranged coaxially with the insertion hole 70. The upper surface of the upper plate 31 is welded, for example. Fixed to The bolt member 64 has a head portion 64a, and is screwed to the nut member 67 from above with the nut member 65 screwed. In other words, the bolt member 64 is attached to the head 6
The nut member 65 is screwed to the nut member 67 in a state where the nut member 65 is arranged between the nut member 67 and the nut member 67 in this state.
The tip end opposite to the head 64 a can be projected downward from the insertion hole 70.

The partition member 58 is an L-shaped member formed by, for example, bending a steel plate, and is provided on the upper surface of the upper plate 31 in front of the through holes 37 and 38, specifically, on the upper side. At the peripheral portion facing each through hole 37, 38 of the plate 31 from the front side,
For example, it is fixed using a screw member 72 and a nut member 73. This partition member 58 is provided at least in each through hole 3.
In the present embodiment, in the area on the front side of each of the through holes 37, 38, the upper plate 31 is provided so as to extend to the area on both left and right sides of each of the through holes 37, 38. The partition wall which rises upward from can be formed.

The work cover device 10 has the meter body 23 of the watt-hour meter 22 partially fitted in the protective cover body 12 and is fixed to the meter body 23 by the locking means 14 and 15. It is locked and attached to watt-hour meter 22. In the housing 40 of the meter main body 23, a metal housing main body 98 has a projection 75 protruding outward and extending in the circumferential direction. This ridge 75 opens to the back side,
A concave groove 75a extending in the circumferential direction is formed. Each of the locking means 14, 15 is provided with a hook-shaped portion 49,
5, the protective cover 12 can be locked to the meter main body 22.

When the work cover device 10 is mounted on the watt-hour meter 22, for example, the other end portions of the base portions 48 of the respective locking pieces 46 are pressed so as to be close to each other with a finger. Each hook 46 is angularly displaced so that the hooks 49 are separated from each other, the meter main body 23 is fitted into the protective cover body 12, and the operation of each of the above-described hooks 46 is performed. The locking pieces 46 are released and displaced by the spring force of the torsion coil spring 53 so that the hook-shaped portions 49 come close to each other,
Each hook-shaped portion 48 is hooked on the ridge 75, thereby locking the protective cover body 12 to the meter main body 23, and
2 can be attached.

At this time, each of the spacers 55 and 56 resiliently abuts the front surface of the meter main body 23, specifically, the front surface of the lid 97. Due to the elastic recovery force of the spacers 55 and 56, the tips 49a of the hook-shaped portions 49 of the locking pieces 46 are fitted into the concave grooves 75a of the ridges 75, respectively.
The locked state of 4 and 15 is not released. In this locked state, as shown in FIG.
7 is in contact with the upper surface of the lid 97 of the meter main body 23, and this lid 97 is attached to the protective cover 1.
The protective cover 12 can be firmly fixed by being sandwiched between the lower plate 32 and the bolt member 64 of the fixing means 57. Moreover, the fixing means 57 has the nut member 65, and the nut member 65 is tightened to the nut member 67 in a state where the lid body 97 is sandwiched by the bolt member 64, thereby preventing the bolt member 64 from being loosened. it can. Further, by forming the bolt member 64 from a synthetic resin, it is possible to prevent the lid body 97 from being damaged.

With the work cover device 10 mounted on the watt-hour meter 22, the protective cover body 12 covers the meter main body 23 from the front side, and at least holds the glass lid 97 constituting the housing 40 in the vertical direction. And from the left and right.

The work cover device 10 is connected to the watt-hour meter 22.
When removing from the bolt member 6 of the fixing means 57
4 so that the protective cover body 12 is slightly pressed toward the rear side, so that the distal end portion 4 of the hook-shaped portion 49 of each locking piece 46 is formed.
9a is removed from the groove, and each operation piece 46 is
9 are displaced from each other so that the protective cover 12 can be removed in this state. Thus, the work cover device 10 is detachable and can be attached only when necessary.

According to the working cover device 10 of the present embodiment, when the watt-hour meter 22 is replaced, the operator places his or her head on the front side of the watt-hour meter 22 so that the connection part 24 can be seen. When the meter body 23 is attached to the meter main body 23, even if the meter main body 23 is damaged due to a short circuit accident or the like, the operator can work on the front side of the meter main body 23. It is possible to protect the meter main body 23 from debris. Even if the meter main body 23 explodes due to a short circuit accident or the like, it is possible to protect the operator from the flame and blast generated at that time. In addition, since the protective cover body 12 covers not only the front side but also the upper side, the lower side, and the right and left sides and covers at least the entirety or almost the entirety of the glass lid body 97, the scattering around the glass fragments is prevented. Can be prevented.

Further, since the protective cover body 12 is attached to the meter main body 23 as described above, the face of the worker can be covered with a curved translucent member like the disaster prevention surface of the prior art. Absent. Therefore, it is possible to prevent a decrease in work efficiency due to deterioration of visibility caused by using a disaster prevention surface as in the conventional technology, and also possible to prevent an injury or the like caused by a worker hitting a surrounding object or the like. ,
Safety can be further improved. Moreover, since the protective cover body 12 is locked to the meter main body 23 by the locking means 14 and 15, there is no need for the operator to press the protective cover body so as not to come off from the meter main body. Can be used for work. Moreover, each of the locking means 14 and 15 can be locked and unlocked by a simple operation with a simple configuration as described above, and is excellent in workability. Furthermore, since the locking means 14 and 15 lock the protective cover body 12 to the metal housing body 98, even if the above-mentioned explosion occurs, the protective cover body 12 is locked.
Since the portion where is locked is not damaged, the protective cover body 12 does not come off.

Further, since the worker does not need to wear the disaster prevention surface, when the disaster prevention surface is worn, the worker is in a narrow space where the disaster prevention surface is in the way and the head cannot enter.
The head can be inserted, and even in such a narrow space, the replacement work of the watthour meter 22 and the like can be easily performed. For example, even in a case where it is stored together with a gas meter or the like in a storage case called a collective storage space, or in a case where it is stored in a storage case in which a door cannot be opened greatly, replacement work can be easily performed. .

Further, according to the work cover device 10, even if the meter body explodes due to a short circuit accident or the like during the replacement work of the watt hour meter 22, the blast accompanying the explosion is transmitted to the respective through holes 37,. It is possible to escape from the protective cover body 12 from the outside and prevent the protective cover body 12 from being detached from the meter main body 23. Moreover, since the through holes 37 and 38 for letting out the blast are formed in the remaining area except the front wall 30, the blast does not blow toward the operator.

Further, according to the working cover device 10, the spacers 55 and 56 are provided on the inner surface of the protective cover body 12,
When the protective cover body 12 is attached, it is possible to prevent the protective cover body 12 from being shaken with respect to the meter main body 23 and displaced. Therefore, it is possible to prevent the protective cover body 12 from being undesirably displaced during the operation, which does not hinder the operation. Furthermore, the spacers 55 and 56 can be elastically deformed, and the spacers 55 and 56 deform the difference in shape and size into a plurality of types of wattmeters 22 having different shapes and sizes depending on manufacturers and types. By this, it can be absorbed and mounted.

Further, according to the working cover device 10, the fixing means 57 is provided on the upper plate 31 of the protective cover body 12, and the upper part of the meter main body 23 is raised by the fixing means 57 with the protective cover body 12 attached. To prevent the protective cover body 12 from being displaced with respect to the meter main body 23, and can be firmly fixed. Protective cover 1 during work
2 can be prevented from being undesirably displaced and hindering the work. Further, by providing such a fixing means 57, it is possible to absorb the difference in shape and dimension by the fixing means and mount it on a plurality of types of watt-hour meters having different shapes and dimensions depending on the manufacturer and type.

Moreover, the work cover device 10 absorbs the difference in the size of the watt hour meter 22 in the left-right direction by the locking means 14 and 15, and absorbs the difference in the size in the front-rear direction by the spacers 55 and 56. The fixing means 57 absorbs the difference in the vertical dimension and can be mounted on many types of watt-hour meters. The watt-hour meter 22 may be housed in an instrument box that houses the watt-hour meter alone, but the protective cover body 12 may be at least partially fitted into the instrument box. Each of the locking means 14 and 15 can move the work cover device 10 into the instrument box even if each of the locking pieces 46 is in any position within the range in which the angular displacement is possible. The work cover device 10 is provided so as not to be fitted, so that the work cover device 10 can be easily and reliably attached to a watt-hour meter provided in the instrument box.

Further, according to the working cover device 10, the front wall 30 of the protective cover body 12 is provided with the light-transmitting region 74 formed by the window hole 41. During such operations, the meter main body 23 can be checked without removing the protective cover body 12 to check the amount of power displayed by the meter main body 23, and the convenience is improved.

Further, the working cover device 10 has a partition member 58, which can prevent the blast blown upward through the through holes 37, 38 from blowing toward the front side. Moreover, the partition member 58 is provided with the respective through holes 37 of the upper plate 31,
Since a partition wall that rises upward from a peripheral portion facing the front side can be formed at 38, the blast that has just passed through the through holes 37 and 38 and exited into a large external space is guided,
The effect of preventing the blast from blowing toward the front side is high. A protective sheet 60 is adhered to the lower plate 32 of the protective cover 12 to prevent a short circuit even when the power lines 25 and 27 come into contact with the lower part of the protective cover 12 during work. it can.

The notches 39 and 40 are provided in the protective cover 12.
Is formed to facilitate attachment to the watt-hour meter 22. More specifically, the watt-hour meter 22 is provided with mounting portions for fixing the lid body 97 to the housing body 98 with the bolt members 98a protruding from both side surfaces thereof, and further provided with a measuring seal by a measuring method. Notch 3
When the protective cover 12 is mounted on the watt-hour meter 22, the mounting portions 9 and 40 are fitted with such mounting portions and measuring seals. Therefore, the protective cover 12 can be easily attached to the watt-hour meter 22.

FIG. 8 is a front view showing the work cover device 11, FIG. 9 is a right side view showing the work cover device 11, and FIG. 10 is a bottom view showing the work cover device 11. Referring also to FIG. 1, the connecting portion cover body 18 of the work cover device 11 is made of a material having electrical insulation, more specifically, for example, polycarbonate having fire resistance, flame retardancy, and impact resistance. Consisting of a front wall 80 and a lower plate 8
1 and left and right side walls 82 and 83, and the thickness of each part is, for example, about 5 mm. The front wall 80 and the lower wall 81 are formed integrally by, for example, bending a flat plate-like member at substantially right angles, and the side walls 82 and 83 are separate from each other and separate from the front wall 80 and the lower plate 81. Body and L
It is arranged so as to fit into a space sandwiched between the front wall 80 and the lower plate 81 having a character shape, and is fixed to both left and right ends of the front wall 80 and the lower plate 81 by using, for example, a screw member 84. .

In the front wall 80, mutually independent working holes 1 are provided.
6a, 16b, 16c; 17a, 17b, 17c are formed by being inserted in the thickness direction, and each of the working holes 16a to 16c;
7a to 17c are holes whose circumference is closed over the entire circumference. The lower plate has a plurality of insertion holes 9 inserted in the thickness direction.
2a, 92b, 92c; 93a, 93b, 93c are formed, and the insertion holes 92c, 93a are connected to each other, and the remaining insertion holes 92a, 92b; 93b, 93c are formed.
Are independent of each other. The power lines 25c and 27a passing through the insertion holes 92c and 93a are in the same phase, and there is no problem even if they are connected. Further, each of the insertion holes 92a to 92c; 9
3a to 93c are open on the back side, respectively. The lower plate 81 has through holes 92a to 92c;
cutouts 95, 96 open to the rear side on both left and right outer sides of c
Are formed. Further, a screw hole 9 is inserted through each of the side walls 82 and 83 in the thickness direction, and an inner screw is formed on the inner peripheral surface.
7, 98 are respectively formed. Hereinafter, each working hole 16a ~
16c; 17a to 17c and respective insertion holes 92a to 92
c; when 93a to 93c are collectively referred to, respective suffixes a to c are omitted.

Respective holding means 19 and 20 are respectively provided at substantially center positions of the side walls 82 and 83 on both sides of the connecting portion cover 18. Each of the holding means 19 and 20 has a configuration similar to each other and is provided substantially symmetrically with respect to the connecting portion cover body 18. Therefore, only the holding means 19 will be described in detail, and the holding means 20 will not be described. The same reference numerals are given to the same parts, and the detailed description is omitted.

The holding means 19 includes a screw portion 100 in which an external screw to be screwed with the internal screw of the screw hole 97 of the connection portion cover body 18 is provided, and a screw portion 10 at one axial end of the screw portion 100.
0 and a disc-shaped operation unit 101 provided coaxially. The holding means 19 is screwed by inserting the screw portion 100 into the screw hole 97 of the side wall 82 from the outside, and screwing the connection portion cover body 1.
8. The screw portion 100 has a length that allows the screw portion 100 to protrude partially inward from the side wall 82 when screwed to the side wall 82. The holding means 20 has a threaded portion 100 of the holding means 19.
It is different in a longer point, but has a similar configuration in the remaining points.

The work cover device 11 includes a front wall 80, a lower plate 81, and respective side walls 82, 83 of the connecting portion cover body 18.
With the connecting portion 24 of the watt-hour meter 22 fitted in the area surrounded by the, the holding means 19 and 20 display from both right and left sides, and the connecting portion cover body 18 is held by the connecting portion 24 and attached. be able to. When the work cover device 11 is mounted on the watt-hour meter 22, the connection portion cover body 18 is connected with the space between the screw portions 100 of the holding means 19 and 20 being larger than the width of the connection portion 24. The connection portion cover body 1 is placed so as to cover from the front side of the portion 24.
The connector 24 is fitted into the connector 8. At this time, the insertion holes 92 and 93 through which the power lines 25 and 27 are individually inserted.
Is open to the rear side, so that the power lines 25 and 27 do not interfere with the connection portion cover 18 when the connection portion 24 is covered with the connection portion cover 18. With the connecting portion cover 18 thus covered on the connecting portion 24, the connecting portion 24 is sandwiched from both left and right sides by the holding means 19 and 20, and the connecting portion cover 18 is held on the connecting portion 24 and mounted. can do. The connecting portion cover 18 is connected to the connecting portion 24.
In the holding state, the working holes 16 and 17 are connected to the terminals 26 and 2 respectively.
8 are individually opened one by one, and each power line 25, 27 is opened.
Are individually inserted into the respective insertion holes 92 and 93. When removing the work cover device 12, each of the holding means 1
It is possible to remove from the watt-hour meter 22 simply by loosening 9, 20.

According to the working cover device 11 of the present embodiment, the connection portion cover body 18 is held at the connection portion 24 when the watt hour meter 22 is replaced, for example, so that each power line 25 , 27 are in direct contact with the terminals 26, 28 other than the corresponding terminals to be connected directly due to disturbance of the stranded wire (strand) called, for example, or indirectly via a tool used for the operation. It can be prevented from contacting and approaching even if not in contact, preventing arcing and damage to the meter main body, so that it is not necessary to use a disaster prevention surface used as a conventional technique. In addition, each terminal 26, 28
Can be prevented from being damaged by the tool.

Further, since the connecting portion cover 18 for preventing the above-mentioned short-circuit accident and the like is mounted on the connecting portion 24 as described above, the face of the worker has a light-transmitting property in which the face of the worker is curved as in the prior art. It is not covered by the member. Therefore, a decrease in work efficiency due to deterioration of visibility caused by using a disaster prevention surface as in the conventional technology can be prevented, and
It is also possible to prevent injuries and the like caused by the worker hitting surrounding articles and the like, and it is possible to further improve safety. Moreover, the connecting portion cover body 18 is provided with holding means 19, 20.
As a result, the worker does not need to press the connection part cover body 18 so as not to come off from the connection part 24, and the worker can use both hands for other work.

Further, each of the holding means 19 and 20 holds the connecting portion 24 by changing the amount of protrusion of the side walls 82 and 83 of the screw portion 100 by a simple operation, for example, by simply grasping and rotating the operating portion 101 by hand. The connection part cover body 18
Is easy to hold. Further, a plurality of grooves for preventing slippage are formed in the outer peripheral portion of the operation portion 101, which also improves workability. Holding means 19,
Since the amount of protrusion of the screw portion 100 can be adjusted by its rotation, it is possible to change the amount of protrusion of the screw portion 100 to a plurality of types of watt-hour meters 22 having different shapes and sizes depending on manufacturers and types. Thus, the work holes 16 and 17 and the terminals 26 and 28 can be mounted without displacement.

As described above, even if the shape and dimensions are different depending on the type of the watt hour meter, the working holes 16 and 17 can be individually and reliably brought into contact with the terminals 26 and 28, respectively. 17 is a partition wall 2 that partitions the terminals 26 and 28
00 is prevented, and the tip of a tool such as an electric torque screwdriver is partitioned by the partition wall 200 so that it can be securely inserted into the space, so that the work of connecting the power lines 25 and 27 can be performed easily and reliably. Can be done.

Further, since the connecting portion cover 18 is made of a material having a light transmitting property, the connecting portion 24 can be confirmed even in a region other than the working holes 16 and 17.
Even if there is a gap between the connecting portion cover 18 and the partition wall of the connecting portion 24, work while confirming that the twisted wires disturbed by the soft ends of the power lines 25 and 27 do not enter the gap. can do.

The power lines 25 and 27 are color-coded according to phases, for example, the power lines 25a and 27c are in the same phase and red, the power lines 25b and 27b are in the same phase and white, and the power lines 25c and 27a are The covering layer is colored in the same phase and black, and at least a part of the connecting portion cover body 18 is correspondingly identified so that the working holes 16 and 17 and the insertion holes 92 and 93 can be identified. Coloring may be performed to improve convenience and workability.

The space in which the terminals 25 and 27 are provided is provided with a metal piece or the like under pressure for the error test of the watt hour meter 22 in the space in which the terminals 25a and 25c are provided. Each of the working holes 16 and 17 has a different shape, and is formed in a shape corresponding to each such space. Further, each side wall 82, 83 is formed to be retracted below the front wall 80, and even if the side wall portion of the meter main body 23 has a shape which bulges downward as shown by a virtual line 161 in FIG. , Can be attached to the connection portion 24 in a suitable state.

Further, by using the work cover devices 10 and 11 together as in this embodiment, the safety can be further improved. Of course, only one of the work cover devices 10 and 11 may be used.

For the notches 95 and 96 formed in the connection portion cover body 18, for example, a reinforced weatherproof type watt hour meter having a projection 160 as shown by a virtual line in FIG. 1 is used as the watt hour meter 22. In some cases, the protrusion 160 can be fitted. Further, when the power supply terminal and the load terminal are added due to a difference in the use of the watt hour meter 22, the power supply line and the load power line that increase with the power supply terminal and the load power line may be used for fitting, or other protrusions may be fitted. It may be used to allow jams.

FIG. 11 is a front view showing a work cover device 10A according to another embodiment of the present invention, FIG. 12 is a right side view showing the work cover device 10A, and FIG. 13 is a work cover device. FIG. 14 is a plan view showing 10A, and FIG. 14 is a bottom view showing the work cover device 10A. The work cover device 10A has a configuration similar to that of the work cover device 10 described with reference to FIGS. 1 to 7. Only different portions will be described, and portions having the same configuration will be the same. The description is omitted by attaching the reference numerals. Work cover device 1
OA has a variable wall 120 in addition to the main body 35 and the front plate 36. The variable wall 120 has a wall 121 and connecting members 122a, 122b; 123a, 123b.

The wall portion 121 has a metal frame 125 and a front plate 126 made of a synthetic resin having translucency. Frame 1
25 is formed by cutting, bending and welding a steel plate having a thickness of 2 mm, for example, and bends 140 and 141 which are bent rearward from the upper end, lower end and both sides of the front wall 127 and the front wall 127, respectively. , 142,143
And A window hole 130 is formed in the front wall 127 so as to be inserted in the thickness direction. Front plate 126 is a plate member having a thickness of 5 mm made of polycarbonate having, for example, fire resistance, flame retardancy and impact resistance, and is arranged on the back side of front wall 127 of frame 125 so as to close window hole 130. , Is provided detachably on the front wall using, for example, a screw member,
When it becomes dirty or scratched, it can be replaced in the same manner as the front plate 36 described above.

The connecting members 122a and 122b and the connecting members 123a and 123b have the same structure and are provided symmetrically. Therefore, only the connecting members 123a and 123b will be described, and the connecting members 122a and 122b will be described. For, corresponding parts are denoted by the same reference numerals and description thereof is omitted. One end of each of the connecting members 123a and 123b is located below the side wall 34 of the main body 35, for example, a screw member 134.
Are connected to each other so as to be angularly displaceable about the respective axes L2 in the left-right direction and parallel to each other, and each other end is provided above the bent portion 143 on one side of the wall 121 by, for example, a screw member 135. L2 and connected to each other so as to be angularly displaceable about respective axes L3 parallel to each other.

The main body 35, the wall 121, and each connecting member 1
22a and 122b form a parallelogram four-node rotating chain link mechanism, and similarly the main body 35
, The wall 121 and the connecting members 123a and 123b form a parallelogram four-node rotating chain link mechanism. Thereby, the wall portion 121 is shown by a solid line in FIGS. 11, 13 and 14, and is shown by a virtual line in FIG.
A mounting position covering the front wall 30 of the main body 35 from the front side,
It is provided so as to be angularly displaceable over a detached position removed from the main body 35 indicated by a solid line in FIG. This wall 121
Is formed so that the window hole 130 coincides with the window hole 41 of the main body 35 when in the mounting position.
Is attached to the main body 35, the effect that the meter main body 23 can be confirmed by the window hole 41 of the main body can be maintained. In addition, it can be arranged at an arbitrary position between the mounting position and the detached position, and the operator can remove the wall portion 121 and arrange it at an arbitrary position, for example, just before the face, and at this time, The operator can check the area behind the wall 12 through the light-transmitting area formed by the window 130.

As described above, according to the working cover device 10A, in addition to the effect of the working cover device 10, the wall portion 121, which is a part of the protective cover body 12, is in contact with the main body 35, which is the remaining portion. Wall 1
For example, the mounting form of the protective cover 12 can be appropriately changed according to the configuration and the mounting position of the watt hour meter, such as the operator's preference, such as removing and disposing it at an arbitrary position. Can be improved.

FIG. 15 is a plan view showing a working cover device 10B according to still another embodiment of the present invention. The work cover device 10B has a configuration similar to that of the work cover device 10, and only different portions will be described, and portions having the same configuration will be denoted by the same reference numerals and description thereof will be omitted. The work cover device 10B has an aperture ratio with respect to the entire upper surface by the through holes 37B and 38B through which the upper plate 31 is inserted.
It is about 50-70% and has a higher aperture ratio than the working cover device 10. By increasing the aperture ratio in this way, the blast generated when the meter body 23 explodes,
You can escape efficiently.

The present invention is not limited to the above-described embodiments, and specific configurations can be changed within the scope of the present invention. For example, the shape and material may be changed. it can. For example, the main body 35 of the protective cover body 12 may be formed by using another metal plate such as an aluminum alloy plate instead of a steel plate, and has electric insulation, fire resistance, flame resistance, and impact resistance. Synthetic resin having properties,
For example, it may be formed using the above polycarbonate. In this case, by using a material having a light-transmitting property, the through-hole region can be integrally formed to form the through-hole region. The meter main body 23 can be checked through the protective cover from both the left and right sides. In addition, even if the protection sheet 60 is not provided on the lower plate 32, a short circuit and a ground fault due to the contact of the power lines 25 and 27 with the protection cover body can be prevented.

Each spacer 5 made of a sponge or the like
Instead of 5 and 56, a spacer constituted by a leaf spring 130 fixed by a screw member at one end on the back side of the front wall 30 as shown by a virtual line in FIG. The effect of can be achieved. Further, although the protective cover body 12 is configured to cover only the lid body 97 of the meter main body 22, the protective cover body 12 may also cover the main body 98 at the same time. Conversely, the protective cover body 12 may cover only the front side of the meter main body 22. You may. Further, the wall member 121 may be configured to be detached from the upper surface, the lower surface, and both right and left sides of the main body 35.

[0074]

According to the first aspect of the present invention, by connecting each power supply power line and each load power line to each terminal of the connection part, the operation of the power consuming equipment connected to the load power line by the meter body is performed. In a watt-hour meter capable of displaying the power consumption by integrating the power consumption based on the load associated with, etc., the protective cover is attached to the meter main body by locking means provided on both sides of the protective cover. The meter body can be locked and detachably mounted to cover the meter body from the front side. If such a protective cover is attached to the meter body when replacing the watt-hour meter as described in connection with the prior art, for example, the meter body may be damaged due to a short circuit accident or the like. Even so, the worker can be protected from the debris. Further, even if the meter body explodes due to a short circuit accident or the like, it is possible to protect the operator from the flame and blast generated at that time.

Further, since the protective cover body for protecting the worker is attached to the meter main body as described above, it is necessary to cover the face of the worker with a curved translucent member as in the prior art. Absent. Therefore, it is possible to prevent the problem that the working efficiency is reduced due to the deterioration of the visibility caused by using the disaster prevention surface as in the conventional technology, and also to prevent the worker from being injured by hitting the surrounding articles. Can be prevented, and safety can be further improved. Moreover, since the protective cover is locked to the meter body by the locking means, there is no need for the operator to press the protective cover so as not to come off the meter body, and the worker can use both hands for other work. it can.

According to the second aspect of the present invention, even if an explosion of the meter body occurs due to a short circuit accident or the like during the replacement work of the watt hour meter, the blast accompanying the explosion is transmitted through. The protective cover body can escape from the hole to the outside of the protective cover body, thereby preventing the protective cover body from coming off the meter main body. Moreover, since the through holes for releasing the blast are formed in the remaining area excluding the front wall, the blast does not blow toward the operator.

According to the third aspect of the present invention, the spacer is provided on the inner surface of the protective cover, and when the protective cover is mounted on the meter main body, the spacer resiliently contacts the outer surface of the meter main body. The contact makes it possible to prevent the protective cover from being shaken and displaced with respect to the meter body when the protective cover is mounted. Therefore, it is possible to prevent the protective cover body from being undesirably displaced during the operation, which does not hinder the operation. Further, by providing such a spacer, it is possible to absorb and attach the difference in shape and dimension to a plurality of types of watt-hour meters having different shapes and dimensions depending on the manufacturer and type by deforming the spacer.

According to the present invention, the fixing means is provided on the upper part of the protective cover, and the upper part of the meter main body is pressed from above by the fixing means with the protective cover attached. The body can be firmly fixed by preventing displacement with respect to the meter body. It is possible to prevent the protective cover body from being undesirably displaced during the operation, which does not hinder the operation. Further, by providing such a fixing means, it is possible to absorb the difference of the shape and the size by the fixing means and mount it on a plurality of types of watt-hour meters having different shapes and dimensions depending on the manufacturer and the type.

According to the fifth aspect of the present invention, the front wall of the protective cover is provided with a light-transmitting area, so that the meter body can be replaced by the meter body during work such as replacement of the meter body of the watt hour meter. In order to confirm the displayed electric energy, it is possible to confirm the meter main body without removing the protective cover, thereby improving the convenience.

According to the sixth aspect of the present invention, since a part of the protective cover is detachably attached to the remaining part, the power can be removed by removing the part and disposing it at a different position. It is possible to appropriately change the mounting form of the protective cover according to the configuration and mounting position of the meter, and the convenience can be improved.

According to the seventh aspect of the present invention, by connecting each power supply line and each load power line to each terminal of the connection portion, the meter body can be used to operate power consuming equipment connected to the load power line. In a watt hour meter capable of calculating and calculating the power consumption based on the accompanying load and displaying the power consumption, the connection unit cover body can be detachably held on the connection unit by the holding means. . This connection part cover body is made of an electrically insulating material,
A plurality of working holes that are individually opened to each terminal while being held by the connection portion are formed, and such a connection portion cover body is formed by, for example, an electric energy as described in relation to the related art. When replacing the meter, by holding at the connection portion, the terminal of each power line should be articulated contact with a terminal other than the corresponding terminal to be connected directly, directly or via a tool used for work, In addition, it is possible to prevent the electrodes from approaching each other even if they do not come into contact with each other, thereby preventing the occurrence of arcs and damage to the meter main body, and obviating the need to use a disaster prevention surface used as a conventional technique.

Further, since the connecting portion cover body for preventing the above-mentioned short-circuit accident and the like is mounted on the connecting portion as described above, it is a light-transmitting member having a curved face of the worker as in the prior art. It will not be covered. Therefore, it is possible to prevent a decrease in work efficiency due to deterioration of visibility caused by using a disaster prevention surface as in the conventional technology, and also possible to prevent an injury or the like caused by a worker hitting a surrounding object or the like. The safety can be further improved. In addition, since the connection cover body is held at the connection part by the holding means, there is no need for the operator to press the connection part cover body so as not to come off from the connection part, and the worker can use both hands for other work. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of work cover devices 10 and 11;

FIG. 2 is a front view of the work cover device 10;

FIG. 3 is a right side view of the work cover device 10;

FIG. 4 is a plan view of the work cover device 10;

FIG. 5 is a bottom view of the work cover device 10;

FIG. 6 is a rear view of the work cover device 10;

FIG. 7 is an enlarged view of the fixing means 57.

FIG. 8 is a front view of the work cover device 11;

9 is a right side view of the work cover device 11. FIG.

FIG. 10 is a bottom view of the work cover device 11;

FIG. 11 is a front view of a work cover device 10A.

FIG. 12 is a right side view of the work cover device 10A.

FIG. 13 is a plan view of the work cover device 10A.

FIG. 14 is a bottom view of the work cover device 10A.

FIG. 15 is a plan view of a work cover device 10B.

FIG. 16 is a plan view of a disaster prevention surface 1 according to the related art.

FIG. 17 is a side view of a disaster prevention surface according to the related art.

[Explanation of symbols]

 10, 11 Work cover device 12 Protective cover body 14 Locking means 16a to 16c, 17a to 17c Working hole 18 Connection part cover body 19, 20 Holding means 22 Watt hour meter 23 Meter main body 24 Connection part 25a to 25c Power supply power line 26a To 26c power supply side terminal 27a to 27c load power line 28a to 28c load side terminal 36 front plate 37,38 through hole 41 window hole 55,56 spacer 57 fixing means 58 partition member 60 protective sheet 74 light transmitting area 92a to 92c, 93a to 93c insertion hole

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-74621 (JP, A) JP-A-11-90638 (JP, A) JP-A-2-95868 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) G01R 11/00-11/66 G01R 21/00-22/04

Claims (7)

(57) [Claims] A connection unit having a plurality of terminals to each of which a plurality of power supply power lines and a plurality of load power lines are individually detachably connected;
A watt-hour meter including a meter body provided with the connection portion, measuring and integrating the number of rotations of a disk rotating by a moving magnetic field generated by a load, displaying the integrated value as a power amount toward the front side, and A protective cover body detachably attached to at least the meter main body from the front side thereof and covering the meter main body from the front side; and provided on both sides of the protective cover body to lock the protective cover body to the meter main body. A work cover device for a watt-hour meter, comprising a locking means. 2. The work cover device for an electricity meter according to claim 1, wherein a through hole is formed in the protective cover body, avoiding a front portion thereof. 3. The protection cover body according to claim 1, wherein a spacer is provided on an inner surface of the protection cover body so as to resiliently contact an outer surface of the meter body when the protection cover body is mounted on the meter body. 3. A work cover device for the watt hour meter according to claim 1. 4. A fixing means for pressing the upper part of the meter main body from above while the protective cover body is mounted on the meter main body to fix the protective cover body to the meter main body, on the upper part of the protective cover body. 2. The device according to claim 1, wherein
4. A work cover device for an electric energy meter according to any one of claims 3 to 3. 5. The watt-hour meter according to claim 1, wherein a light-transmitting region for checking the amount of power of the meter body is provided at a front portion of the protective cover body. Work cover device. 6. The work cover device for an electric energy meter according to claim 1, wherein a part of the protective cover body is detachably provided. 7. A connection portion having a plurality of terminals to which each of the plurality of power supply lines and the load power line is individually detachably connected,
A watt-hour meter including a meter body provided with the connection portion, measuring and integrating the number of rotations of a disk rotating by a moving magnetic field generated by a load, displaying the integrated value as a power amount toward the front side, and An electrically insulating connecting portion cover body, which is detachably mounted on the connecting portion and has a plurality of working holes formed to individually open at respective terminals of the connecting portion, and a connecting portion cover body; And a holding means for holding the power to the power meter.