JP7172697B2 - Terminal cap for low pressure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a low-voltage terminal cap used for replacement work of a low-voltage meter.

When replacing a low-voltage instrument, first remove the wiring from the terminals of the low-voltage instrument to be replaced, then replace the low-voltage instrument to be replaced with a new low-voltage instrument, and then reconnect the previously removed wiring. Work to connect to a new low pressure gauge. The wiring removed from the terminal section of the low-voltage meter to be replaced is connected to the charging section.

Conventionally, by attaching a low-voltage terminal cap to each of the wires removed from the terminal part of the low-voltage meter to be replaced and insulating the live part of the cable temporarily removed from the low-voltage meter, the wires come into contact with each other. This prevents short circuits caused by accidents and electric shocks caused by the wiring coming into contact with workers.

The number of low-voltage terminal caps to be used when replacing a low-voltage meter is determined according to the number of wires. Use low pressure end caps. Conventionally, by connecting three low-voltage end caps with a string and handling them collectively, the burden on the operator is reduced compared to handling the low-voltage end caps one by one.

As a related technology, specifically, conventionally, for example, screws inserted into a plurality of recessed terminal accommodating portions formed in a weighing instrument body and screwing plate-shaped terminals into the terminal accommodating portions from the upper surface side There is a technology related to a terminal cover for an electric power meter that has a cover body that covers the terminal housing and that is fixed to the terminal accommodating portion using the screw (see, for example, Patent Document 1 below).

In addition, as a related technology, specifically, conventionally, for example, a protective part formed of an insulator and covering the lower edge of the draining part of an electric meter, a plate-shaped fixing part formed by a magnet, and a protective part There is a technology related to a short-circuit prevention device that has a connecting part that connects to a fixed part, and is temporarily fixed to an electric meter when replacing the electric meter, thereby preventing the electric wire from contacting the draining part. (See, for example, Patent Document 2 below.).

JP 2014-135146 A JP 2009-192387 A

However, the conventional technique described above has a problem that the string connecting the three low-voltage end caps is easily entangled, and the work of untangling the tangled string takes time and is troublesome. Specifically, if the string becomes entangled during the replacement work of the low-voltage gauge, the low-voltage terminal cap becomes difficult to handle, resulting in a decrease in work efficiency.

In addition, in the above-described conventional technology, if a string becomes tangled during the replacement work of the low-voltage gauge, the user must focus on the string to untangle the tangled string, which results in a large amount of distraction from the charging section. There was a problem of inferior safety. Specifically, while looking away from the live part to untangle the tangled string, the live part moves to an unexpected place, causing the wires to come into contact with each other, causing a short circuit or the wires to break. There is a problem that an electric shock or the like may occur due to contact with a worker.

In addition, the conventional techniques described in Patent Document 1 and Patent Document 2 mentioned above can both contribute to the prevention of short-circuiting during the replacement work of the low-voltage gauge. This technology does not contribute to the handling of low-voltage end caps that insulate live parts, nor does it insulate the live parts of cables that are temporarily removed from low-voltage instruments, so it is possible to prevent cables from coming into contact with each other and short-circuiting. There was a problem that it was difficult to prevent it.

Furthermore, in the conventional technology described in Patent Document 1, it is necessary to attach a terminal cover for an electric power meter to each terminal using a screw that is screwed to a terminal of the low-voltage meter. There is a problem that such work is complicated. In addition, the conventional technology described in Patent Document 1 described above involves a power failure on the load side when installing the terminal cover for a power meter. There was a problem that it was difficult to cope with the replacement work of the instrument.

SUMMARY OF THE INVENTION An object of the present invention is to provide a low-pressure end cap capable of shortening the working time, improving the working efficiency, and ensuring the safety of the operator, in order to solve the problems of the prior art described above. do.

In order to solve the above-described problems and achieve the object, a low-pressure terminal cap according to the present invention includes a pair of pinch members having one end rotatable about a fulcrum, and the pair of pinch members A fixed part that is fixed to the fixed object by sandwiching the fixed object between them, and a plurality of substantially cylindrical caps that are closed at one end in the axial direction and open at the other end through an opening and a connecting portion connecting the fixing portion and the protecting portion, wherein one end of the connecting portion is connected to the fixing portion and the other end is connected to a plurality of caps included in the protecting portion. It is characterized by comprising a plurality of string-shaped cap connecting members that are respectively connected, and a plurality of tube-shaped tangling prevention members that accommodate the plurality of cap connecting members inside, respectively.

Moreover, the terminal cap for low pressure according to the present invention is characterized in that, in the above-described invention, a cap holding portion is provided in the fixing portion and holds the cap detachably.

Moreover, the terminal cap for low pressure according to the present invention is characterized in that, in the above-described invention, it is provided with a tool holding portion which is provided in the fixing portion and into which an elongated member can be inserted and removed.

According to the low-voltage end cap of the present invention, it is possible to shorten the working time and improve the working efficiency, and to ensure the safety of the operator.

FIG. 2 is an explanatory diagram (Part 1) showing the configuration of the low-voltage end cap of the embodiment according to the present invention; FIG. 2 is an explanatory diagram (No. 2) showing the configuration of the low-voltage terminal cap of the embodiment according to the present invention; FIG. 3 is an explanatory diagram (No. 3) showing the configuration of the low-voltage terminal cap of the embodiment according to the present invention; FIG. 4 is an explanatory diagram (part 4) showing the configuration of the low-voltage terminal cap of the embodiment according to the present invention; It is explanatory drawing (1) which shows the replacement|exchange procedure of the low voltage meter using the terminal cap for low voltages of embodiment concerning this invention. It is explanatory drawing (part 2) which shows the replacement|exchange procedure of the low voltage meter using the terminal cap for low voltages of embodiment concerning this invention. It is explanatory drawing (3) which shows the replacement|exchange procedure of the low voltage meter using the terminal cap for low voltages of embodiment concerning this invention. It is explanatory drawing (part 4) which shows the replacement|exchange procedure of the low voltage meter using the terminal cap for low voltages of embodiment concerning this invention. FIG. 5 is an explanatory diagram showing the configuration of a low-voltage terminal cap according to another embodiment of the invention;

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a low-pressure end cap according to the present invention will be described in detail below with reference to the accompanying drawings.

(Structure of terminal cap for low voltage)
First, the configuration of the low-voltage end cap of the embodiment according to the present invention will be described. 1 to 4 are explanatory diagrams showing the configuration of a low-voltage terminal cap according to an embodiment of the invention. As shown in FIGS. 1 to 4, the low-pressure terminal cap 100 of the embodiment according to the present invention includes a protective portion 110, a connecting portion 120, a fixing portion 130, a cap holding portion 140, and a tool holding portion 150. ing.

The protective portion 110 includes a substantially cylindrical cap 111 closed at one end in the axial direction and opened at the other end through an opening 111a. The inner diameter of the cap 111 is about the same as the outer diameter of the electric wire (see FIGS. 5 to 8) connected to the low voltage gauge. The length of the cap 111 in the axial direction is such that, when the cap 111 is attached to the electric wire, a sufficient frictional force can be secured between the cap 111 and the outer surface of the electric wire to prevent the cap 111 from falling off from the electric wire. there is

A through-hole 112 for connection is provided on the closed end side of the cap 111 . The protective part 110 is connected to the connecting part 120 through the through hole. In the cap 111, by providing a connecting through-hole 112 on the closed end side, that is, on the side opposite to the opening 111a, it is possible to secure the degree of freedom in the work of attaching the cap 111 to the electric wire during the replacement work of the low-voltage gauge. can.

The cap 111 is formed using an electrically insulating material. Specifically, the cap 111 can be formed using, for example, a resin material such as vinyl chloride or polyethylene. Vinyl chloride has high mechanical and chemical stability, is flame-retardant, and has little change in molecular structure over a long period of time, so that its mechanical strength does not easily change. By forming the cap 111 using such a material, it is possible to prevent the cap 111 from being damaged during the replacement work of the low-voltage gauge, and to ensure the insulation of the tip of the electric wire.

The protector 110 has three caps 111 . The three caps 111 are made of different colored resins. Specifically, the three caps 111 are made of red, white, and black resins, respectively. When replacing the low-voltage gauge, the red cap 111 and the black cap 111 are attached to the non-grounded wire, and the white cap 111 is attached to the grounded wire (neutral wire).

In the protection unit 110, all three caps 111 are made of resin of the same color, and each cap 111 is provided with a "non-grounded line" and a "grounded line" or "R phase", "S phase" and "T phase". , or the like, may be provided to guide the electric wire to be attached. Alternatively, in the protection part 110, two of the three caps 111 may be made of resin of the same color and one may be made of resin of a different color.

The connection portion 120 includes a cap connection member 121 and an entanglement prevention member 122 . The cap connecting member 121 is made of a flexible material and has a string shape. A cap connecting member 121 is provided for each cap 111 . Each cap connecting member 121 has one end connected to the protection portion 110 and the other end connected to the fixing portion 130 . By connecting the protective part 110 and the fixed part 130 with the flexible cap connecting member 121, the degree of freedom of the positional relationship between the protective part 110 and the fixed part 130 can be ensured.

One end side of the cap connecting member 121 is inserted so as to pass through the connecting through hole 112 in each cap 111 , and is closed so as to form a ring while penetrating the connecting through hole 112 . Accordingly, by connecting the cap connecting member 121 to the cap 111, the degree of freedom in handling the cap 111 is not impaired. Thereby, the degree of freedom of the positional relationship between the cap connecting member 121 and the cap 111 can be ensured, and the handling of the low-pressure terminal cap 100 can be facilitated.

It is preferable that the cap connecting member 121 be made of a material that is electrically insulating in addition to being flexible. Specifically, cap connecting member 121 can be formed using vinylon, polyester, or the like, for example. Alternatively, cap connecting member 121 may be specifically formed using cotton or the like, for example.

The entanglement prevention member 122 has a tubular shape. The cap connecting member 121 is provided inside the pipeline of the tube-shaped entanglement preventing member 122 . The entanglement prevention member 122 has a length in the axial direction shorter than the length of the cap connecting member 121 . Therefore, the cap connecting member 121 passes through the entanglement prevention member 122 and both ends are positioned outside the entanglement prevention member 122 .

The entanglement prevention member 122 has flexibility such that it deforms according to the external force when a predetermined external force or more is applied. The entanglement prevention member 122 is a flexible member that bends in response to an external force greater than or equal to a predetermined value without substantially changing the cross-sectional shape along the direction perpendicular to the length (without being crushed). It is preferable to have

In addition, the entanglement prevention member 122 has elasticity so that it returns to its original shape when released from the applied external force. Further, the entanglement prevention member 122 is preferably made of an electrically insulating material. Specifically, the entanglement prevention member 122 can be realized by, for example, a silicon tube or a rubber tube.

The fixing part 130 has a clip shape. Specifically, the fixed portion 130 includes a pair of pinch members 131 and 132 and a biasing member 133 . The pair of pinch members 131 and 132 are connected to each other at their intermediate portions in the length direction so as to be relatively swingable. The pair of pinch members 131 and 132 are brought into contact with each other or separated from each other by swinging relative to each other with the connection position as a fulcrum.

The pair of pinch members 131 and 132 forms a gap between the one end sides in the length direction and the joint positions of the pinch members 131 and 132 when the one end sides in the length direction are in contact with each other. The gap is opened and closed in conjunction with the opening and closing operation of the fixed portion 130, that is, the operation of bringing one end sides of the pair of pinch members 131 and 132 into contact with each other and separating them from each other in the length direction.

The pair of pinch members 131 and 132 are preferably made of a material with low conductivity, such as a polymeric material called plastic. Alternatively, the pair of pinch members 131, 132 may be formed using a metal material, for example, the surface of which is covered with an insulating material.

Anti-slip members 134 are provided on one end sides of the pair of pinch members 131 and 132, respectively. The non-slip member 134 can be realized by, for example, a sheet-like member made of a material with high frictional resistance such as rubber or silicon. The non-slip member 134 may be provided by applying a material having high frictional resistance, such as rubber or silicon, to one end side of the pair of pinch members 131 and 132, respectively. The non-slip member 134 may be provided over the entire surface of the pair of pinch members 131 and 132 .

The biasing member 133 biases the pair of pinch members 131 and 132 so that one end sides of the pair of pinch members 131 and 132 in the length direction contact each other. The biasing member 133 is provided, for example, on the other end side of the pair of pinch members 131 and 132 relative to the connection position, and biases the other end sides of the pair of pinch members 131 and 132 in the length direction away from each other. It can be realized by a biasing compression spring. Alternatively, the biasing member 133 is provided, for example, on one end side of the pair of pinch members 131 and 132 relative to the connecting position, and biases the pair of pinch members 131 and 132 in the direction of drawing the one end sides in the length direction of the pair of pinch members 131 and 132 toward each other. It may be realized by a tension spring that

The fixing portion 130 includes a rectangular metal plate-like member bent at two points in the length direction so that the short sides are in contact with each other and the cross-sectional shape is approximately triangular. and an operation piece attached to the . Specifically, fixing portion 130 may have a configuration similar to a clip called a “double clip”, for example. In this case, due to the rigidity of the plate member, an urging force that urges the short sides to come into contact with each other acts, so that the plate member can also serve as the urging member 133 .

The cap holding portion 140 is provided on the fixed portion 130 . Specifically, the cap holding portion 140 can be realized by a projection provided on one pinch member 131 of the pair of pinch members 131 and 132 and protruding from the one pinch member 131 . The diameter dimension of the projection is approximately the same as the inner diameter dimension of the cap 111 . Thereby, the cap holding part 140 can hold the cap 111 by fitting the cap 111 to the projection.

It is preferable that the projecting direction of the protrusion that realizes the cap holding portion 140 is parallel to the axial direction, which is the center of the swing of the pair of pinch members 131 and 132 . Thereby, the cap 111 can always be attached to or detached from the cap holding portion 140 regardless of the open/closed state of the pair of pinch members 131 and 132 .

A non-slip member for the cap may be provided on the surface of the cap holding portion 140 . Specifically, the non-slip member for the cap is formed by, for example, a film formed on the surface of the cap holding portion 140 from a material with high frictional resistance such as rubber or silicon, or unevenness provided on the surface of the cap holding portion 140. can be realized.

By providing a non-slip member for the cap on the surface of the cap holding portion 140 , the cap 111 can be prevented from falling off from the cap holding portion 140 . This makes it possible to prevent the cap 111 from falling off from the cap holder 140 regardless of the orientation of the low-voltage end cap 100 attached to the low-voltage gauge when replacing the low-voltage gauge, which will be described later.

The tool holding portion 150 is provided on the other pinch member 132 of the pair of pinch members 131 and 132 . Specifically, the tool holding portion 150 is configured by a rib 151 projecting from the other pinch member 132 in a direction away from the one pinch member 131 and a through hole 152 passing through the rib 151 . The through-hole 152 penetrates the rib 151 in a direction parallel to the projecting direction of the protrusion that realizes the cap holding portion 140 .

(Replacement procedure for low pressure gauge)
Next, a procedure for replacing a low-voltage gauge using the low-voltage end cap 100 of the embodiment of the present invention will be described. 5 to 8 are explanatory diagrams showing procedures for replacing a low-voltage gauge using the low-voltage end cap 100 according to the embodiment of the present invention. The low-voltage meter 500 to be replaced using the low-voltage terminal cap 100 according to the embodiment of the present invention may be an inductive watt-hour meter or an electronic watt-hour meter. The configuration for measuring the amount of power is not particularly limited.

As shown in FIG. 5 and the like, the low-pressure gauge 500 is attached inside a case 501 fixed to a wall surface such as a wall of a building such as a house. The case 501 is fixed inside the case 501 using mounting screws (not shown). The low-voltage meter 500 includes a body portion 510 and a connection terminal block 520 .

The body portion 510 includes a box-shaped housing 511 . A window (not shown) through which the inside of the low-pressure gauge 500 can be checked is provided on the front side of the housing 511 . A weighing unit and a display unit are provided inside the housing 511 (not shown).

The measuring unit measures the integrated value of the amount of electric power supplied to the low voltage meter 500 . The display unit displays information about the integrated value of the electric energy measured by the measuring unit. The contents displayed on the display unit can be visually recognized from the outside of the low-voltage meter 500 through the window when the watt-hour meter 600 is viewed from the front. The configuration of the metering section differs depending on whether the low-pressure meter 500 according to the embodiment of the invention is, for example, an induction meter or an electronic meter.

If the low-voltage meter 500 is, for example, an induction-type meter, the metering section includes a rotating disk member made of metal material, a voltage coil, and a current coil. The rotary disk member is formed in a disk shape using a metal material, and is provided so as to be rotatable around a rotation shaft provided at the center of the disk shape. The voltage coil is provided on one side of the rotating disk member, and arranged so that the magnetic core coincides with the center of rotation of the disk-shaped member. The current coil is provided on the other side of the rotating disk member, and arranged so that the magnetic core coincides with the center of rotation of the disk-shaped member.

In the metering section, when power is supplied to the low-voltage meter 500, a magnetic flux is generated between the voltage coil and the current coil that penetrates the rotating disk member based on the voltage applied to the voltage coil and the current applied to the current coil. occurs. This magnetic flux moves around the center of rotation of the rotating disk member, and the movement of this magnetic flux generates a rotating magnetic field.

The rotating disk member is rotated by rotational torque obtained by using this rotating magnetic field. The measuring unit in the induction-type meter measures the integrated value of the electric energy supplied to the low-voltage meter 500 based on the amount of rotation of the rotating disk member. Rotational torque is proportional to electric power. The configuration of the weighing unit in the induction-type meter is a known technology, and therefore the description is omitted.

Also, if the low-voltage meter 500 is an electronic meter, for example, the weighing unit multiplies the voltage and the current based on the power supplied to the low-voltage meter 500, and integrates the multiplication result. The integrated value of the amount of power supplied to the low voltage meter 500 is measured. A weighing section in an electronic meter includes an input conversion section, a multiplication processing section, and a frequency dividing circuit section.

The input converter converts the voltage level and current level of the supplied power into the voltage level and current level of the electronic circuit configured between the first terminal and the second terminal. The multiplication processing unit generates a pulse signal proportional to the amount of supplied electric power through multiplication processing based on the voltage level and current level converted by the input conversion unit. The frequency dividing circuit section converts the clock frequency of the pulse signal generated by the multiplication processing section into a predetermined clock frequency lower than the clock frequency. Such a measuring unit measures an integrated value of electric energy by performing an integration process based on a pulse signal converted to a predetermined clock frequency by the frequency dividing circuit unit.

The weighing unit in an electronic meter integrates electric energy using a multiplication method such as a time-division multiplication method (analog multiplication) that performs pulse width modulation, or a ΔΣ/A/D conversion multiplication method (digital multiplication). Weigh the amount. The time-division multiplication method (analog multiplication), the ΔΣ/A/D conversion multiplication method (digital multiplication), and the configuration of the weighing unit in the electronic meter can be easily realized using various known techniques, so explanation is omitted. omitted.

The display unit displays information about the integrated value of the electric energy measured by the measuring unit. Specifically, the display unit displays a numerical value indicating the integrated value of the electric energy measured by the measuring unit. For example, the display section can use reels of a plurality of digits on which numbers 0 to 9 are assigned, and can be displayed in current character form indicated by the numbers assigned to the reels.

Further, the display unit may be of a pointer type that displays the integrated value of the measured amount of electric power, for example, by a pointer. Also, the display unit may indicate the integrated value of the electric energy by a multi-digit number from 0 to 9 displayed using a liquid crystal display or the like.

The connection terminal block 520 includes first terminals 1S, 2S, 3S and second terminals 1L, 2L, 3L. A low-voltage meter 500 to be replaced using the low-voltage terminal cap 100 of this embodiment has three first terminals 1S, 2S, and 3S, three second terminals 1L, 2L, and 3L, It has

The first terminals 1S, 2S, and 3S are each connected to a power source via an electric wire 521 (521a). The power supply is the source of power supply to the low voltage gauge 500, and the first terminals 1S, 2S, 3S in this embodiment are connected to a wire 521a leading to a power plant or transmission line 521. FIG.

The second terminals 1L, 2L, and 3L are each connected to a load via an electric wire 521 (521b). The load can be an electrical appliance using power passed through the low voltage meter 500 or a facility using electricity. The power supply side wire 521a and the load side wire 521b are fixed to the first terminals 1S, 2S, 3S and the first terminals 1S, 2S, 3S by wire mounting screws 522, respectively.

The low-voltage meter 500 may include a communication terminal 523. The communication terminal 523 is a terminal provided for transmitting a pulse signal each time a certain amount of electric power is reached. It is said that it is possible to check the amount of electric power even in a remote place. A communication line can be fixed to each of the communication terminals 523 with a wire attachment screw 522 . The communication terminal 523 in the low-voltage instrument 500 and the communication method using the communication terminal 523 can be easily realized by using various known techniques, so the description thereof is omitted.

When replacing the low-pressure gauge 500, first, as shown in FIG. keep it fixed. At this time, it is preferable to fix the positions of the caps 111 by fitting the respective caps 111 to the protrusions of the cap holding portion 140 in advance. This prevents the hanging cap 111 from interfering with the work.

Moreover, it is preferable to hold a tool 502 such as a screwdriver in the tool holding portion 150 of the low-pressure terminal cap 100 fixed around the low-pressure gauge 500 . A tool 502 such as a screwdriver can be easily held simply by inserting it into the through hole 152 provided in the rib 151 . When replacing the low-voltage gauge 500, the breaker on the load side is turned off in advance for the purpose of protecting various electric devices connected to the low-voltage gauge 500. FIG.

Next, the wiring is removed from the connection terminal block 520 of the low-voltage meter 500 to be replaced. Specifically, first, the wire attachment screw 522 in the low voltage meter 500 is removed. At this time, by fixing the low-voltage terminal cap 100 around the low-voltage instrument 500 in advance and holding a tool 502 such as a screwdriver in advance in the tool holding portion 150, the operator can use the tool such as a screwdriver. 502 can be easily and quickly picked up.

In the tool holding portion 150, a tool 502 such as a screwdriver can be easily held simply by inserting it into the through hole 152 provided in the rib 151. Therefore, when interrupting work, the tool 502 such as a screwdriver can be easily held. can be easily and quickly held by the tool holding portion 150 to free the hands. Then, when restarting work, the tool 502 such as a screwdriver can be easily and quickly picked up.

After removing the wire attachment screw 522, the wire 521 fixed by the removed wire attachment screw 522 is removed from the low voltage meter 500 (main body 510 and connection terminal block 520). Thereby, as shown in FIG. 6, the wire 521 from which the wire attachment screw 522 has been removed can be pulled out from the connection terminal block 520 . Electric wire 521 after being pulled out from low-voltage meter 500 is in a state where charging portion 600 at the tip thereof is exposed.

Next, when the electric wire 521 whose tip is exposed by being pulled out from the low voltage meter 500 is one of the three electric wires 521a connected to the charging portion 600, the low voltage is indicated by the arrow in FIG. A cap 111 is attached to the electric wire 521 a pulled out from the meter 500 . The cap 111 is attached to the tip of the wire by covering the tip of the exposed wire 521a, like fitting the cap 111 to a writing instrument. In addition, the cap 111 is immediately put on the tip of the exposed electric wire 521a after being pulled out from the low-voltage meter 500 .

In this way, the operation of pulling out the wire 521a from the low-voltage meter 500 and attaching the cap 111 to the tip of the pulled-out wire 521a every time it is pulled out is performed for all three wires 521a connected to the charging portion 600. After the electric wire 521a connected to the charging portion 600 is pulled out from the low-voltage meter 500, the exposed end of the electric wire 521a is covered with the cap 111 each time it is pulled out.

The tool holding portion 150 can easily hold a tool 502 such as a screwdriver simply by inserting it into the through hole 152 provided in the rib 151 . can be quickly held by the tool holding portion 150 to free the operator's hand. As a result, after removing the wire mounting screw 522, the operator can quickly proceed to the task of pulling out the wire 521a from the low-voltage meter 500, thereby shortening the working time and improving the working efficiency.

In this way, when the electric wire 521a is pulled out from the low-voltage meter 500 and the cap 111 is attached to the tip of the pulled-out electric wire 521a each time it is pulled out, the low-voltage terminal cap 100 is fixed in advance around the low-voltage meter 500, By fitting the caps 111 to the projections of the cap holding portion 140 and fixing the positions of the caps 111, the work of attaching the caps 111 to the tips of the three electric wires 521a connected to the charging portion 600 can be performed. can be completed quickly. As a result, the working time can be shortened, the working efficiency can be improved, and the safety of the operator can be ensured.

In this embodiment, the caps 111 are made of red, white, and black resins, respectively, so that the caps 111 of each color can be attached to the electric wire 521 having the coating of the same color. . Specifically, the red cap 111 is attached to the red-coated wire 521a, and the black cap 111 is attached to the black-coated wire 521a. Also, the white cap 111 is attached to the ground wire (neutral wire), which is the electric wire 521a with a white coating. In this way, by color-coding the caps 111, erroneous connection can be reliably prevented, and the safety of the operator can be ensured.

As a result, the three electric wires 521a connected to the charging portion 600 are each covered with the cap 111 as shown in FIG. Since the cap 111 is formed using a material with excellent insulation performance, by covering the three wires 521a connected to the charging portion 600 with the cap 111, each wire 521a can be insulated. .

In the low-voltage terminal cap 100, the caps 111 are independent and can be handled separately. Charging portions 600 can be reliably covered one by one. The low-voltage gauge 500 to be replaced is removed from the case 501 after removing all the electric wires 521 connected to the low-voltage gauge 500 .

As described above, by attaching the cap 111 to the ends of the three wires 521a connected to the charging unit 600, it is possible to prevent a short circuit or an electric shock due to contact of the charged power supply side wires 521a with the surroundings. be able to. Further, as a result, the worker can perform subsequent work without worrying about short circuit or electric shock due to contact of the charged electric wire 521a on the power supply side with the surroundings, thus improving workability. can be planned.

In addition, by fixing the low-voltage terminal cap 100 around the low-voltage instrument 500 before removing the electric wire 521 (521a, 521b) from the connection terminal block 520 of the low-voltage instrument 500 to be replaced, the operator can After pulling out the low pressure gauge 500, the cap 111 can be picked up easily and quickly. Thereby, the cap 111 can be quickly attached to the tips of the three electric wires 521 connected to the charging portion 600 .

As a result, the time during which the charging portion 600 is exposed can be shortened, and the electric wires 521a connected to the charging portion 600 can be short-circuited due to contact with each other, or the electric wires 521a can come into contact with the operator. By doing so, it is possible to reliably prevent the operator from being electrocuted. As a result, the working time can be shortened, the working efficiency can be improved, and the safety of the operator can be ensured.

Also, by attaching the cap 111 to the ends of the three wires 521a connected to the charging portion 600, the wires 521a connected to the charging portion 600 can be prevented from coming into contact with each other. The user can safely take his or her eyes off the electric wire 521a connected to the charging section 600 . As a result, the operation of moving the low-pressure gauge 500 removed from the case 501 or picking up a new low-voltage gauge 500 can be performed calmly and reliably.

Next, the low-pressure gauge 500 to be replaced is replaced with a new low-pressure gauge 500 . Specifically, as indicated by the arrows in FIG. 8, a new low-pressure gauge 500 is mounted inside the case 501, and then the mounting screws are mounted. This fixes the position of the low-pressure gauge 500 with respect to the case 501 . After that, the wires 521 (521a, 521b) removed previously are connected to the new low-voltage gauge 500. FIG.

Specifically, the previously removed wires 521 (521a, 521b) are inserted into the first terminals 1S, 2S, 3S and the second terminals 1L, 2L, 3L, respectively. Of the six wires 521 connected to the low-voltage meter 500, the wires 521b connected to the load are inserted into the second terminals 1L, 2L, 3L, respectively.

Of the six wires 521 (521a, 521b) connected to the low-voltage instrument 500, the three wires 521a connected to the charging portion 600 are removed from the caps 111 to expose the charging portion 600, and then 1 terminals 1S, 2S, and 3S, respectively. In the low-voltage terminal cap 100, the caps 111 are independent and can be handled separately. can be done.

It is preferable that each time the cap 111 is removed from the electric wire 521a connected to the charging portion 600 is removed, the cap 111 is fitted into the protrusions of the cap holding portion 140 to fix its position. As a result, the cap 111 removed from the electric wire 521a remains hanging around the low-voltage gauge 500, thereby preventing the cap 111 from interfering with the work. As a result, the operator can perform subsequent operations without being distracted by the cap 111 removed from the electric wire 521a, the cap connecting member 121, and the like, thereby improving workability.

After that, the wire mounting screws 522 are tightened to the first terminals 1S, 2S, 3S and the second terminals 1L, 2L, 3L, respectively, and the wires 521a, 621b are connected to the low voltage gauge 500. The wire attachment screw 522 is tightened using a tool 502 such as a screwdriver. At this time, by fixing the low-voltage terminal cap 100 around the low-voltage instrument 500 in advance and holding a tool 502 such as a screwdriver in advance in the tool holding portion 150, the operator can use the tool such as a screwdriver. 502 is immediately available. As a result, the working time can be shortened and the working efficiency can be improved.

(another embodiment)
Next, a low-voltage terminal cap according to another embodiment of the invention will be described. In another embodiment, the same parts as in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

(Structure of terminal cap for low voltage)
FIG. 9 is an explanatory diagram showing the configuration of a low-voltage terminal cap according to another embodiment of the invention. As shown in FIG. 9, a low-pressure terminal cap 900 according to another embodiment of the present invention includes a protection portion 110, a connecting portion 120, a fixing portion 130, a cap holding portion 140, and a tool holding portion 150. there is

The fixing portion 130 has a clip shape composed of a pair of pinch members 131 and 132 and a biasing member 133 . The other pinch member 132 of the pair of pinch members 131 and 132 is provided with a cap holding portion 140 and a tool holding portion 150 . The rib 151 constituting the tool holding portion 150 is provided in the central portion of the outer surface of the other pinch member 132 rather than the end surface of the other pinch member 132 where the cap holding portion 140 is provided.

According to another embodiment of the low-pressure terminal cap 900, the other pinch member 132 is provided with the cap holding portion 140 and the tool holding portion 150, so that the operator can By fixing the low-pressure terminal cap 900 to the case 501 so as to be positioned outside the case 501 that houses the gauge 500, the low-voltage cap fixed to the periphery of the low-voltage gauge 500 can be replaced when the low-pressure gauge 500 is replaced. Access from only one side of the end cap 900 allows the cap 111 to be picked up and a tool 502 such as a screwdriver to be picked up.

As a result, the operator can easily pick up the cap 111 or the tool 502 such as a screwdriver without putting the hand inside the case 501 . And thereby, shortening of working time and improvement of working efficiency can be aimed at.

As described above, the low-pressure terminal caps 100 and 900 according to the embodiments of the present invention are provided with a pair of pinch members 131 and 132, one end of which is rotatable about a fulcrum. A fixed part 130 fixed to the object to be fixed by sandwiching the object to be fixed between pinch members 131 and 132, and a substantially cylindrical cylinder with one end closed in the axial direction and the other end opened through an opening. A protective portion 110 having a plurality of shaped caps 111 and a connecting portion 120 connecting the fixed portion 130 and the protective portion 110 are provided. a plurality of string-shaped cap connecting members 121 respectively connected to the plurality of caps 111 provided in the protective portion 110, and a plurality of tube-shaped entanglement prevention members 122 accommodating the plurality of cap connecting members 121 inside, respectively. and

According to the low-pressure terminal caps 100 and 900 of the embodiment according to the present invention, since the plurality of caps 111 are connected to the fixing portion 130 by the connecting portion 120, by fixing the position of the fixing portion 130, the plurality of The movement of the cap 111 can be limited within the range of a sphere centered on the fixing portion 130 and having the length of the cap connecting member 121 as a radius. This prevents the loss of the cap 111 during the replacement work of the low-pressure gauge 500, and reduces the burden on the operator as compared with handling the caps 111 one by one.

In addition, according to the low-pressure terminal caps 100 and 900 of the embodiments of the present invention, the caps 111 can be properly connected by connecting the fixed portion 130 and each cap 111 with the plurality of string-shaped cap connecting members 121, respectively. In addition, by covering the cap connecting member 121 with a plurality of tube-shaped tangling prevention members 122 to prevent the cap connecting member 121 from getting tangled, good handleability of the cap 111 can be ensured. As a result, the work can be performed smoothly, and the time during which charging portion 600 is exposed can be shortened.

As described above, according to the low-voltage end caps 100 and 900 of the embodiment according to the present invention, the burden on the worker who replaces the low-voltage gauge 500 can be reduced, and the time during which the charging portion 600 is exposed is reduced. can be shortened, the working time can be shortened, the working efficiency can be improved, and the safety of the operator can be ensured.

Further, the low-pressure terminal caps 100 and 900 of the embodiments according to the present invention are characterized by including a cap holding portion 140 which is provided on the fixing portion 130 and holds the cap 111 in a detachable manner.

According to the low-voltage terminal caps 100 and 900 of the embodiment according to the present invention, by holding the cap 111 on the fixing portion 130, the cap 111 can be positioned near the hand of the operator who performs the replacement work of the low-voltage gauge 500. can be kept As a result, the worker can easily and quickly pick up the cap 111 when replacing the low-voltage gauge 500, and the time during which the charging portion 600 is exposed can be shortened, thereby shortening the working time. In addition, it is possible to improve the work efficiency and ensure the safety of the operator.

Further, the low-pressure terminal caps 100 and 900 of the embodiment according to the present invention are characterized by having a tool holding portion 150 provided on the fixing portion 130 and capable of inserting and removing an elongated member.

According to the low-voltage terminal caps 100 and 900 of the embodiment according to the present invention, by holding the tool 502 such as a screwdriver in the fixing portion 130, the tool is placed near the hand of the worker who performs the replacement work of the low-voltage instrument 500. can be positioned. As a result, the worker can easily and quickly pick up the tool 502 such as a screwdriver when replacing the low-voltage gauge 500, and the time during which the charging portion 600 is exposed can be shortened. It is possible to shorten the time and improve the work efficiency, as well as ensure the safety of the worker.

INDUSTRIAL APPLICABILITY As described above, the low-voltage terminal cap according to the present invention is useful as a low-voltage terminal cap used for replacement work of low-voltage gauges, and in particular, for low-voltage terminal caps used for replacement work of low-voltage gauges in narrow work spaces. Suitable for

REFERENCE SIGNS LIST 100 low-voltage terminal cap 110 protective portion 111 cap 111a opening 112 through-hole for connection 120 connecting portion 121 cap connecting member 122 entanglement prevention member 130 fixing portion 131, 132 pinch member 133 biasing member 140 cap holding portion 150 tool holding portion 151 Rib 152 Through hole 900 Terminal cap for low pressure

Claims (3)

a fixing part comprising a pair of pinch members having one end rotatable around the fulcrum, and fixed to the fixed object by sandwiching the fixed object between the pair of pinch members;
a protective portion comprising a plurality of caps having a substantially cylindrical shape with one end in the axial direction closed and the other end opened through an opening;
a connection portion that connects the fixed portion and the protection portion;
with
The connecting portion includes a plurality of string-shaped cap connecting members each having one end connected to the fixing portion and the other end connected to a plurality of caps included in the protecting portion, and the plurality of cap connecting members are arranged inside the cap connecting members. and a plurality of tube-shaped entanglement prevention members to be housed in a low pressure terminal cap. 2. The low-voltage terminal cap according to claim 1, further comprising a cap holding portion provided on said fixing portion and detachably holding said cap. 3. The low-pressure terminal cap according to claim 1, further comprising a tool holding portion provided in said fixing portion and capable of inserting and extracting an elongated member.

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