JP2012189554A - Watt-hour meter protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work efficiency about opening/closing of an instrument box, regardless of the length of elapsed time since installation.SOLUTION: A watt-hour meter protector 100 includes an instrument box 101 for storing a watt-hour meter in a space formed by combining a base 201 and a cover 102; screw insertion holes 202 and 203 continuously penetrating the base 201 and the cover 102 while the base 201 and the cover 102 are combined; and a screw-shaped body 104 formed by using nonmetal material, and inserted in the screw insertion holes 202 and 203 so as to be extracted. While the screw-shaped body 104 is inserted in the screw insertion holes 202 and 203, a protrusion 403 is engaged with a peripheral portion of the screw insertion hole 203, thereby preventing the screw-shaped body 104 from coming off from the screw insertion holes 202 and 203.

Description

  The present invention relates to a power meter protection device for protecting a power meter.

  Conventionally, there has been an instrument box used to protect a watt-hour meter used outdoors from rain dew or impact. A conventional instrument box includes a base (main body) and a cover. The watt-hour meter is accommodated in a space formed in the base (main body) and the cover. The cover is fixed to the base by screwing a brass screw into the base via the cover. The instrument box is installed with the base and cover combined. For example, one screw is provided at a position that becomes the lower end of the instrument box when the instrument box is installed.

  The instrument box that accommodates the watt-hour meter is designed to prevent illegal use of the watt-hour meter by, for example, sealing using a sealing line and a sealing tool. Conventionally, when sealing an instrument box using a conventional sealing method using a sealing line and a sealing tool, first, a sealing through hole provided in each of the base and the cover and a screw head are penetrated in the diameter direction. The sealing wire is passed through the through-hole provided as described above. Next, the sealing wire passed through each through hole is crimped together with the sealing tool in a state where the sealing wire is tightened so that the sealing wire does not loosen. Thereby, the looseness of the sealing line is prevented and the screw through which the sealing line is passed is fixed, so that the instrument box can be sealed.

  Such an instrument box may be opened, for example, when the watt hour meter is replaced or surveyed. When opening the cover of the instrument box sealed using the conventional sealing method, the sealing line was cut | disconnected and the screw was loosened. When the cover was opened, the cut sealing line and the sealing tool that fixed the sealing line were discarded.

  However, since the meter boxes of watt-hour meters used outdoors are exposed to ultraviolet rays and wind and rain, it is not uncommon for brass screws to deteriorate over time due to rain dew, etc. When the rust is generated, the screw is cut when the cover is opened, and a part of the rusted screw may remain in the screw hole of the base.

  Some of the screws that have been cut off and remain in the screw holes in the base are rusty and have no head, making them difficult to loosen or tighten. For this reason, if a part of the screw remains in the screw hole of the base, the instrument box cannot be opened normally, and a part of the instrument box is destroyed and the watt hour meter is replaced or investigated. There was something I had to do. In this case, in addition to the original work such as watt-hour meter replacement and survey, the instrument box has to be replaced, resulting in a problem of poor work efficiency.

  In addition, the above-described conventional technique has a problem that the burden on the operator is heavy because the instrument box must be replaced in addition to the original work such as replacement and investigation of the watt-hour meter. In addition, there is a problem that the cost burden on the installation side of the watt hour meter increases by exchanging the unscheduled instrument box.

  Further, in the above-described conventional technology, since the sealing is performed by passing the sealing wire through the through hole provided in the head of the screw, when the screw is broken, such as when the screw is cut off, Cannot be sealed. In this case, similarly to the above, the instrument box has to be replaced, and there is a problem that work efficiency is poor. Moreover, by exchanging the instrument box, there is a problem that, as described above, the burden on the operator is increased and the cost burden on the installation side of the watt-hour meter is increased.

  In addition, in the conventional technology described above, when the cover is opened, it is assumed that the screw body is rusted. Must-have. For this reason, in the above-described conventional technique, there is a problem that the working time becomes long and the working efficiency is very poor.

  In order to eliminate the above-described problems caused by the prior art, the present invention provides a watt-hour protective device capable of improving work efficiency for opening and closing an instrument box regardless of the length of time elapsed since installation. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, a watt-hour protective device according to the present invention includes a base and a cover, and a watt-hour meter in a space formed by combining the base and the cover. An instrument box that houses the base, the base and the cover in a combined state, a through hole that continuously penetrates the base and the cover, and a non-metallic material, and penetrates the through hole in the insertion / extraction direction. And a screw-like body that is removably inserted into the seal hole, and prevents the screw-like body from falling out of the through-hole when the screw-like body is inserted into the through-hole. A watt-hour protective device comprising a drop-off prevention mechanism.

  Moreover, the watt-hour protective device according to the present invention is the above-described invention, wherein the length of the shaft portion of the screw-like body is the tip of the screw-like body in a state where the screw-like body is inserted into the through hole. Is projected to the outside of the instrument box, and the drop-off prevention mechanism includes a protrusion that engages the instrument box in a state where the screw-like body is inserted into the through hole, and the protrusion is connected to the instrument box. The screw-like body is prevented from falling off from the through hole by engaging with the through hole.

  Moreover, the watt-hour protective device according to the present invention is the above-described invention, wherein the length of the shaft portion of the screw-like body is the tip of the screw-like body in a state where the screw-like body is inserted into the through hole. Is projected to the outside of the instrument box, and the drop-off prevention mechanism is provided with a protrusion projecting in a direction intersecting the insertion direction of the screw-like body, and the screw-like shape provided in the instrument box with respect to the sealing hole. A groove that allows movement of the protrusion as the body is inserted and removed, and the protrusion from the through hole is engaged with the instrument box by rotation of the screw-like body inserted into the through hole. The screw-shaped body is prevented from falling off.

  In addition, the watt-hour protective device according to the present invention is provided in the above-described invention at a position where the protrusion comes into contact with the base when the screw-like body inserted into the through hole rotates a predetermined angle. A stopper member for restricting the rotation range of the screw-like body is provided.

  According to the watt-hour protective device according to the present invention, it is possible to improve the working efficiency for opening and closing the instrument box regardless of the length of time elapsed since the installation.

It is explanatory drawing (the 1) which shows the structure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 2) which shows the structure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 3) which shows the structure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing which shows a screw-shaped body. It is explanatory drawing which expands and shows partially the instrument box in the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 1) which shows the attitude | position of the screw-shaped object with respect to an instrument box in the state inserted in the screw insertion hole. It is explanatory drawing (the 2) which shows the attitude | position of the screw-shaped object with respect to an instrument box in the state inserted in the screw insertion hole. It is explanatory drawing which shows the seal | sticker in the watt-hour meter protector of embodiment concerning this invention. It is explanatory drawing (the 1) which shows the attachment procedure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 2) which shows the attachment procedure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 3) which shows the attachment procedure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 4) which shows the attachment procedure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 1) which shows the removal procedure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 2) which shows the removal procedure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 3) which shows the removal procedure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 4) which shows the removal procedure of the watt-hour meter protection instrument of embodiment concerning this invention. It is explanatory drawing (the 1) which shows the structure of the conventional instrument box. It is explanatory drawing (the 2) which shows the structure of the conventional instrument box. It is explanatory drawing (the 1) which shows the attachment procedure of the conventional instrument box. It is explanatory drawing (the 2) which shows the attachment procedure of the conventional instrument box. It is explanatory drawing (the 3) which shows the attachment procedure of the conventional instrument box. It is explanatory drawing (the 4) which shows the attachment procedure of the conventional instrument box. It is explanatory drawing (the 1) which shows the removal procedure of the conventional instrument box. It is explanatory drawing (the 2) which shows the removal procedure of the conventional instrument box. It is explanatory drawing (the 3) which shows the removal procedure of the conventional instrument box.

  Exemplary embodiments of a power meter protection device according to the present invention will be described below in detail with reference to the accompanying drawings.

(Configuration of energy meter protection device)
First, the structure of the watt-hour protective device of this embodiment concerning this invention is demonstrated. 1, 2 and 3 are explanatory views showing the configuration of the watt-hour protective device of the embodiment according to the present invention.

  In FIG. 1, the state which looked at the watt-hour protective device of embodiment concerning this invention from the front is shown. In FIG. 2, the state which decomposed | disassembled the watt-hour meter protection instrument of embodiment concerning this invention and was seen from the side is shown. In FIG. 3, the watt-hour meter protective instrument of embodiment concerning this invention is decomposed | disassembled and the state seen from the diagonal direction is shown.

  1, 2, and 3, a power meter protection device 100 according to an embodiment of the present invention includes a meter box 101 that houses a power meter (not shown). The instrument box 101 includes a base 201 and a cover 102. The base 201 and the cover 102 each have a substantially box shape having openings on opposite sides. The instrument box 101 accommodates the watt hour meter in a space formed by combining the base 201 and the cover 102. The base 201 is fixed to a wall surface of a house.

  The cover 102 includes a reading window 103 for reading the measurement value of the watt hour meter. The reading window 103 includes an opening 103a penetrating the cover 102 in the plate thickness direction, and a transparent plate member 103b fitted in the opening 103a. The transparent plate member 103b can be formed using, for example, a polymer material called plastic.

  The cover 102 is fitted to the base 201 and is fixed to the base 201 by the screw-like body 104 in the fitted state. The screw-like body 104 is provided in each of the base 201 and the cover 102. In a state where the base 201 and the cover 102 are combined, the screw-like body 104 is formed in screw insertion holes 202 and 203 as through holes that linearly penetrate the base 201 and the cover 102. Inserted. A screw stopper 204 as a stopper member for restricting the rotation of the screw-like body 104 is provided on the back side of the base 201 and in the vicinity of the screw insertion hole 203 provided in the base 201.

  FIG. 4 is an explanatory view showing the screw-like body 104. In FIG. 4, the screw-like body 104 includes a shaft portion 401 and a head portion 402 provided at one end of the shaft portion 401. The shaft 401 includes a protrusion 403 at the tip (the end opposite to the side on which the head 402 is provided). The protrusion 403 protrudes from the outer peripheral surface of the shaft portion 401 in the radial direction of the shaft portion 401.

  The protrusion 403 engages with the periphery of the screw insertion hole 203 in the base 201 in a state where the screw-like body 104 is inserted into the screw insertion holes 202 and 203, and the screw-like body 104 is dropped from the screw insertion holes 202 and 203. To prevent. In this embodiment, a drop-off prevention mechanism can be realized by the periphery of the screw insertion hole 203, the protrusion 403, and the like.

  The protrusion 403 includes a taper 403 a provided so as to be inclined with respect to a plane orthogonal to the axis in the length direction of the shaft portion 401. By providing the protrusion 403 with a taper 403a, after the protrusion 403 abuts against the screw stopper 204 by turning the screw-like body 104 in the tightening direction, the tightening force when the screw-like body 104 is further turned in the tightening direction is increased. The tightening force of the screw-like body 104 can be strengthened.

  A taper 401 a is provided at the tip of the shaft 401 so as to be inclined so that the diameter becomes smaller toward the tip. Thereby, the screw-like body 104 can be easily inserted into the screw insertion holes 202 and 203. By providing the taper 401a at the tip of the shaft portion 401, it is possible to improve the work efficiency particularly when working in a place where the work space is narrow, and the work for attaching the watt-hour protective device 100 is facilitated. Efficiency can be improved.

  A linear groove 402 a orthogonal to the axial direction is provided on the end surface of the head 402. By providing the linear groove 402a on the end surface of the head 402, a minus driver can be used when the screw-like body 104 is tightened or loosened. Electricity meters are not easily noticeable, such as the back door side of a house on the site, and are often installed in relatively small places. For this reason, it is difficult to secure a sufficient working space, and there is a situation in which an operator has to perform an operation of tightening or loosening the screw-like body 104 with an unnatural posture. If the posture of the worker who performs the work of tightening or loosening the screw-like body 104 is unnatural, the burden on the worker increases.

  A flat-blade screwdriver is one of the tools that are often carried by workers who work on watt-hour meters. By enabling the use of a flat-blade screwdriver, the worker can use a flat-blade screwdriver as appropriate according to the work environment. Can be used. Thus, the screw-like body 104 is turned by hand in a work environment that is easily accessible, and a minus screwdriver is used in a work environment that is difficult to reach. The tightening operation and the loosening operation of the screw-like body 104 can be reliably performed. As a result, it is possible to reduce the burden on the operator involved in the work of tightening or loosening the screw-like body 104.

  A magnetic member (not shown) such as a magnet may be provided on the head portion 402 of the screw-like body 104. Since the tip of a flathead screwdriver is generally formed using a metal material, a screw member 104 is screwed into the tip of the flat screwdriver by the magnetic force of the magnetic member by providing a magnetic member on the head 402 of the screw-like body 104. The screw-like body 104 can be inserted into the screw insertion holes 202 and 203 while the body 104 is adsorbed. This can prevent the screw-like body 104 from inadvertently dropping when the work on the electricity meter protection device 100 is performed in a small work space.

  Further, by providing a magnetic member on the head portion 402 of the screw-like body 104, when removing the screw-like body 104 from the watt-hour protective device 100, the screw-like body 104 is attracted to the tip of the minus driver by the magnetic force of the magnetic member. In this state, the threaded body 104 can be pulled out from the screw insertion holes 202 and 203. This can prevent the screw-like body 104 from inadvertently dropping when the work on the electricity meter protection device 100 is performed in a small work space.

  The screw-like body 104 includes a sealing hole 404 that penetrates the shaft portion 401 and the head portion 402 along the axial direction of the shaft portion 401. A sealing line (see FIG. 8) is passed through the sealing hole 404 when the instrument box 101 is sealed. Sealing hole 404 penetrates linearly along the axial direction of shaft portion 401. By making the sealing hole 404 straight, it is possible to facilitate the operation of passing the sealing line.

  The screw-like body 104 is formed using a non-metallic material. Specifically, the screw-like body 104 can be formed using, for example, a polymer material called plastic, ceramic (ceramics), or the like. A ceramic is a sintered body that is a metal oxide as a basic component and baked and hardened by heat treatment at a high temperature, and has high heat resistance and high hardness.

  The outer peripheral surface of the screw-like body 104 and the inner peripheral surface of the screw insertion hole 203 may be provided with screw threads having the same pitch. When threads are provided on the outer peripheral surface of the screw-like body 104 and the inner peripheral surface of the screw insertion hole 203, the screw-like body 104 can be securely fixed to the instrument box 101. When no thread is provided on the outer peripheral surface of the screw-like body 104 and the inner peripheral surface of the screw insertion hole 203, the screw-like body 104 is inserted into the screw insertion hole 203 until the protrusion 403 faces the outside of the instrument box 101. If there is, the screw-like body 104 can be rotated regardless of the position of the screw-like body 104 with respect to the screw insertion hole 203, so that the workability can be improved.

  FIG. 5 is an explanatory diagram showing a partially enlarged view of the instrument box 101 in the watt-hour protective device 100 according to the embodiment of the present invention. In FIG. 5, the periphery of the screw insertion hole 202 in the instrument box 101 as viewed from the cover 102 side is shown enlarged. The screw insertion hole 203 in the instrument box 101 as viewed from the base 201 side has the same shape as the screw insertion hole 202.

  In FIG. 5, the screw insertion hole 202 (screw insertion hole 203) accepts the insertion of the shaft portion 401 and has a shape of a front rear conical shape so as to allow passage of the protrusion 403 accompanying the insertion of the shaft portion 401. There is no. In this embodiment, the screw insertion hole 202 (screw insertion hole 203) is provided so that the upper side is rectangular and the lower side is circular. Of the screw insertion hole 202 (screw insertion hole 203), the diameter of the portion into which the shaft portion 401 is inserted is smaller than the diameter of the head portion 402. An upper portion having a rectangular shape in the screw insertion hole 202 (screw insertion hole 203) realizes a groove allowing the movement of the protrusion 403.

  6 and 7 are explanatory views showing the posture of the screw-like body 104 with respect to the instrument box 101 in a state where the screw-like holes 202 and 203 are inserted. 6 and 7, the screw-like body 104 is inserted into the screw insertion holes 202 and 203 with the projection 403 facing upward in the vertical direction. The length of the shaft portion 401 in the screw-like body 104 is such that the screw-like body 104 is inserted into the screw insertion holes 202 and 203 until the head portion 402 of the screw-like body 104 contacts the cover 102. The length of the projection 403 is such that the projection 403 is positioned on the back side of the base 201.

  Thereby, the screw-like body 104 in a state of being completely inserted into the screw insertion holes can rotate around the axis in the screw insertion holes 202 and 203. When the screw-like body 104 that has been completely inserted into the screw insertion holes 202 and 203 is rotated 180 degrees, the protrusion 403 comes into contact with the screw stopper 204. Thereby, the rotation angle of the screw-like body 104 can be limited to 180 degrees. The screw-like body 104 inserted into the screw insertion holes 202 and 203 is in a state where it can be inserted into and removed from the screw insertion holes 202 and 203 (see FIG. 6), and insertion into and removal from the screw insertion holes 202 and 203 are restricted. State (see FIG. 7).

  The base 201 may be provided with another screw stopper (not shown) for regulating the rotation angle of the screw-like body 104 from the state shown in FIG. 7 to the state shown in FIG. In this case, similarly to the screw stopper 204, another screw stopper is provided on the back side of the base 201 and in the vicinity of the screw insertion hole 203 provided in the base 201.

  Thereby, the rotation angle of the screw-like body 104 can be surely limited to 180 degrees, and when the screw-like body 104 inserted in the screw insertion holes 202 and 203 is pulled out from the screw insertion holes 202 and 203, It is possible to prevent the screw-like body 104 from being easily pulled out by the protrusion 403 being caught by the base 201. By preventing the screw-like body 104 from becoming difficult to pull out, it is possible to improve the working efficiency particularly when working in a narrow work space, and the work for the watt-hour protective device 100 after installation is easy. And work efficiency can be improved.

  The watt-hour protective device 100 is sealed so that the cover 102 cannot be illegally opened (the cover 102 is removed from the base 201) after the watt-hour meter is installed. Sealing is performed using a sealing line and a sealing tool. FIG. 8 is an explanatory diagram showing a seal in the watt-hour protective device 100 according to the embodiment of the present invention.

  In FIG. 8, sealing is performed by passing a sealing wire 801 through the sealing hole 404 in the screw-like body 104 inserted into the screw insertion holes 202 and 203, and crimping both ends of the sealing wire 801 with a sealing tool 802. . The sealing tool 802 is provided with a through hole (not shown), and is crimped to the through hole in a state where both ends of the sealing wire 801 are passed.

  The sealing line 801 can be formed using a metal material such as copper, for example. The sealing tool 802 can be formed using a metal material such as lead. A strong seal can be achieved by integrating a seal and a seal 802 formed using a metal material by pressure bonding.

(Procedure for installing the electricity meter protection device 100)
Below, the attachment procedure of the electricity meter protection instrument 100 of embodiment concerning this invention is demonstrated. 9, FIG. 10, FIG. 11 and FIG. 12 are explanatory views showing the attachment procedure of the watt-hour protective device 100 according to the embodiment of the present invention. 9, 10, 11, and 12, when attaching the energy meter protection device 100 according to the embodiment of the present invention, first, the base 201 is fixed to the wall surface of the house, and the fixed base is fixed. With the watt hour meter attached to 201, attach the cover 102 to the base 201. Thereby, the base 201 and the cover 102 are fixed to the wall surface of a house.

  Next, the screw-like body 104 is inserted into the screw insertion holes 202 and 203 in a state where the base 201 and the cover 102 are fixed to the wall surface of the house (see FIG. 9). The screw-like body 104 is inserted into the screw insertion holes 202 and 203 in such a state that the protrusion 403 is located on the upper side in the vertical direction. The screw-like body 104 is inserted into the screw insertion holes 202 and 203 until the head portion 402 hits the cover 102.

  After the screw-like body 104 is inserted into the screw insertion holes 202 and 203 until the head 402 abuts against the cover 102, the protrusion 403 on the screw-like body 104 inserted into the screw insertion holes 202 and 203 has a lower side in the vertical direction. The screw is rotated 180 degrees so as to be positioned at (see FIGS. 10 and 11). Since the straight groove 402 a is provided in the head portion 402 of the screw-like body 104, the screw-like body 104 can be rotated by applying a flathead screwdriver 1001 to the screw head portion 402.

  Next, the sealing wire 801 is passed through the sealing hole 404 in the screw-like body 104 that is inserted into the screw insertion holes 202 and 203 and the protrusion 403 is positioned on the lower side in the vertical direction (see FIG. 11). Since the sealing hole 404 passes straight through the screw-like body 104 along the axial direction of the screw-like body 104, the sealing wire 801 can be easily passed therethrough.

  Then, both ends of the sealing line 801 passed through the sealing hole 404 are crimped together with the sealing tool 802 using the sealing tool 802 (see FIG. 12). The crimping operation is performed using a tool such as pliers. In the watt-hour protective device 100 according to the embodiment of the present invention, the sealing device 802 used for sealing the conventional instrument box 101 is used as it is without changing the shape or the crimping method. be able to.

(Procedure for removing power meter protection device 100)
Below, the removal procedure of the watt-hour protective device 100 of embodiment concerning this invention is demonstrated. FIG. 13, FIG. 14, FIG. 15 and FIG. 16 are explanatory views showing the procedure for removing the watt-hour protective device 100 according to the embodiment of the present invention. When removing the watt-hour protective device 100 according to the embodiment of the present invention, first, the seal applied to the watt-hour protective device 100 is released.

  Specifically, the sealing wire 801 is cut (see FIG. 13), and the cut sealing wire 801 is removed from the watt-hour protective device 100 together with the sealing device 802. Since the sealing hole 404 linearly penetrates the screw-like body 104 along the axial direction of the screw-like body 104, the sealing line 801 can be easily removed.

  Next, the screw is rotated 180 degrees so that the protrusion 403 in the screw-like body 104 inserted into the screw insertion holes 202 and 203 moves from the lower side to the upper side in the vertical direction (see FIGS. 14 and 15). ). Since the straight groove 402 a is provided in the head portion 402 of the screw-like body 104, the screw-like body 104 can be rotated by applying a flathead screwdriver 1001 to the screw head portion 402. Then, with the protrusion 403 on the screw-like body 104 positioned on the upper side in the vertical direction, the screw-like body 104 is pulled out from the instrument box 101 (see FIG. 16).

(Configuration of conventional instrument box 101)
Next, the configuration of a conventional instrument box will be described. 17 and 18 are explanatory diagrams showing the configuration of a conventional instrument box. In FIG. 17, the state which decomposed | disassembled the conventional instrument box and was seen from the diagonal direction is shown. FIG. 18 shows a state in which a part of FIG. 17 is enlarged.

  17 and 18, a conventional instrument box 1701 includes a base 1702 and a cover 1703. The base 1702 is fixed to a wall surface of the house, and the cover 1703 is attached to the base 1702 so as to cover the base 1702 fixed to the wall surface of the house. The base 1702 and the cover 1703 are provided with screw insertion holes 1702a and 1703a that linearly penetrate the base 1702 and the cover 1703 in a state where the base 1702 and the cover 1703 are combined. Screws 1704 are inserted into the screw insertion holes 1702a and 1703a in a state where the base 1702 and the cover 1703 are combined.

  The screw 1704 includes a shaft portion 1801 and a head portion 1802, and the shaft portion 1801 is provided with a screw thread 1801a. On the inner peripheral surface of the screw insertion hole 1702a provided in the base 1702, a screw thread (not shown) that is screwed into the screw thread 1801a of the screw 1704 is provided.

  In addition, the base 1702 and the cover 1703 are provided with through holes 1702b and 1703b for sealing that penetrate the base 1702 and the cover 1703 linearly in a state where the base 1702 and the cover 1703 are combined. Sealing through holes 1702b and 1703b are provided in the vicinity of the screw insertion holes 1702a and 1703a in the base 1702 and the cover 1703, respectively. A head 1802 of the screw 1704 is provided with a sealing hole 1802 a that penetrates the head 1802 in the diameter direction of the head 1802.

(Installation procedure of conventional instrument box 1701)
Next, a procedure for attaching the conventional instrument box 1701 will be described. 19, FIG. 20, FIG. 21 and FIG. 22 are explanatory diagrams showing a procedure for attaching a conventional instrument box 1701. FIG. 19, 20, 21, and 22, when attaching the conventional instrument box 1701, first, the base 1702 is attached to the wall surface of the house, etc., similarly to the attachment work of the electricity meter protection device 100 according to the present invention. To fix. Then, with the watt hour meter attached to the fixed base 1702, the base 1702 is attached so as to cover the cover 1703, and the base 1702 and the cover 1703 are fixed to the wall surface of the house.

  Then, with the base 1702 and the cover 1703 fixed to the wall surface of the house or the like, the screws 1704 are inserted into the screw insertion holes 1702a and 1703a. Since a screw thread is provided on the inner peripheral surface of the screw insertion hole 1702a provided in the base 1702, the screw 1704 inserted into the screw insertion hole 1702a temporarily stops in the middle of the screw insertion hole 1702a (see FIG. 19). reference). After the screw 1704 has stopped once, the operator rotates the screw 1704 a plurality of times, so that the screw thread 1801a provided on the screw 1704 is provided on the inner peripheral surface of the screw insertion hole 1702a provided on the base 1702. It had to be screwed onto the thread (see FIG. 20). For this reason, when attaching the conventional instrument box 1701, there is a problem that the work of rotating the screw 1704 a plurality of times is complicated and the workability is inferior.

  On the other hand, according to the watt-hour protective device 100 of the embodiment of the present invention, compared with the sealing operation of the conventional instrument box 1701, it is a simple operation that only rotates the screw-like body 104 by 180 degrees. The screw-like body 104 can be prevented from falling off from the instrument box 101. Thereby, according to the watt-hour protective device 100 of the embodiment of the present invention, the work can be facilitated and the workability can be improved.

  When attaching the conventional instrument box 1701, the screw thread 1801a provided on the screw 1704 is completely screwed to the screw thread provided on the inner peripheral surface of the screw insertion hole 1702a provided on the base 1702. Does the seal. When sealing the conventional instrument box 1701, first, the sealing wire 801 is passed through the sealing through holes 1702b and 1703b which are provided in the vicinity of the screw insertion holes 1702a and 1703a and linearly penetrate the base 1702 and the cover 1703 ( (See FIG. 21).

  Then, the sealing wire 801 that passes through the sealing through-holes 1702b and 1703b that linearly penetrates the base 1702 and the cover 1703 is passed through the sealing hole 1802a provided in the screw head 1802, and then the sealing is performed. Both ends of the wire 801 are crimped together with the sealing tool 802 using the sealing tool 802 (see FIG. 22). Thus, when sealing the conventional instrument box 1701, the sealing through-holes 1702b and 1703b penetrating the base 1702 and the cover 1703 linearly, and the sealing hole 1802a provided in the screw head 1802 Therefore, there is a problem that work is complicated and workability is inferior.

  Further, when sealing the conventional instrument box 1701, the screw thread 1801a provided on the screw 1704 is completely screwed to the screw thread provided on the inner peripheral surface of the screw insertion hole 1702a provided on the base 1702. In this case, it is difficult to unify the directions of the sealing holes 1802a provided in the screw heads 1802 with respect to the sealing through holes 1702b and 1703b that linearly penetrate the base 1702 and the cover 1703. For this reason, every sealing operation, the situation of the operation of passing the sealing wire 801 through the sealing hole 1802a provided in the screw head 1802 is different, and there is a problem that the operation becomes complicated and inferior in workability.

  On the other hand, according to the watt-hour protective device 100 of the embodiment of the present invention, it is inserted into the screw insertion holes 202 and 203 provided in the instrument box 101 as compared with the sealing work for the conventional instrument box 1701. Thus, it is possible to facilitate the operation of passing the sealing wire 801 through the sealing hole 404 that linearly penetrates the screw-like body 104, and to improve the workability.

(Removal procedure of conventional instrument box 1701)
Next, a procedure for removing the conventional instrument box 1701 will be described. 23, 24, and 25 are explanatory views showing a procedure for removing the conventional instrument box 1701. FIG. When the conventional instrument box 1701 is removed, first, the sealing line 801 is cut, and the sealed seal line 801 is removed from the conventional instrument box 1701 together with the sealing tool 802 (see FIG. 23).

  Next, the screw 1704 is removed from the conventional instrument box 1701 (see FIG. 24), and the cover 1703 is removed from the base 1702 (see FIG. 25). In the conventional instrument box 1701, since the screw thread 1801a provided on the screw 1704 is screwed to the screw thread provided on the inner peripheral surface of the screw insertion hole 1702a provided on the base 1702, a plurality of screws 1704 are provided. It was necessary to rotate. For this reason, when removing the conventional instrument box 1701, there is a problem that the work of rotating the screw 1704 a plurality of times is complicated and the workability is inferior.

  On the other hand, according to the watt-hour protective device 100 of the embodiment of the present invention, as compared with the sealing operation for the conventional instrument box 1701, it is a simple operation that only rotates the screw-like body 104 by 180 degrees. The screw-like body 104 can be removed from the instrument box 101. Thereby, according to the watt-hour protective device 100 of the embodiment of the present invention, the work can be facilitated and the workability can be improved.

  As described above, the watt-hour protective device 100 according to the embodiment of the present invention includes the base 201 and the cover 102, and the power is generated in the space formed by combining the base 201 and the cover 102. An instrument box 101 that accommodates a meter, screw insertion holes 202 and 203 that realize through holes that continuously pass through the base 201 and the cover 102 in a state where the base 201 and the cover 102 are combined, and a non-metallic material are used. A screw-like body 104 that is removably inserted into the screw insertion holes 202 and 203, and the protrusion 403 is inserted into the screw insertion hole in a state where the screw-like body 104 is inserted into the screw insertion holes 202 and 203. The screw-like body 104 is detached from the screw insertion holes 202 and 203 by being engaged with the periphery of 203. It is characterized in that to prevent.

  According to the electricity meter protection device 100 of the embodiment of the present invention, the screw-like body 104 that fixes the base 201 and the cover 102 in the combined state is dropped from the instrument box 101, and the protrusion 403 is screwed. By preventing engagement with the periphery of the hole 203, the instrument box 101 can be opened and closed as compared with the conventional instrument box 1701 that fixes the base 1702 and the cover 1703 in a state where they are combined by screwing of the screws 1704. It is possible to improve the work efficiency.

  Moreover, according to the watt-hour protective device 100 of the embodiment of the present invention, the base 201 and the cover 102 in a combined state are fixed using the screw-like body 104 formed using a non-metallic material. By doing so, the state of the installation site can be maintained, so that it is possible to improve the work efficiency for opening and closing the instrument box 101 regardless of the length of time elapsed since installation.

  Moreover, the watt-hour protective device 100 according to the embodiment of the present invention has the length of the shaft portion 401 of the screw-like body 104 in a state where the screw-like body 104 is inserted into the screw insertion holes 202 and 203. The tip of the screw-like body 104 has a length that protrudes to the outside of the instrument box 101, and the drop-off prevention mechanism has a protrusion 403 that engages the instrument box 101 with the screw-like body 104 inserted into the screw insertion holes 202 and 203. , And the protrusion 403 is engaged with the instrument box 101 to prevent the screw-like body 104 from falling off from the screw insertion holes 202 and 203.

  According to the electricity meter protection device 100 of the embodiment of the present invention, the screw-like body 104 that fixes the base 201 and the cover 102 in a combined state is prevented from falling off from the instrument box 101 with a simple configuration. can do. Thus, the working efficiency for opening and closing the instrument box 101 can be improved as compared with the conventional instrument box 1701 that fixes the base 1702 and the cover 1703 in a state where they are combined by screwing of the screws 1704.

  Moreover, the watt-hour protective device 100 according to the embodiment of the present invention has the length of the shaft portion 401 of the screw-like body 104 in a state where the screw-like body 104 is inserted into the screw insertion holes 202 and 203. The tip of the screw-like body 104 has a length that protrudes to the outside of the instrument box 101, and a drop-off prevention mechanism is provided on the instrument box 101 with a protrusion 403 that projects in a direction crossing the insertion direction of the screw-like body 104. A groove that allows the projection 403 to move with the insertion and removal of the screw-like body 104 with respect to the insertion holes 202 and 203, and the projection 403 is formed by the rotation of the screw-like body 104 inserted into the screw insertion holes 202 and 203. The screw-like body 104 is prevented from falling off from the screw insertion holes 202 and 203.

  According to the watt-hour meter protection instrument 100 of the embodiment of the present invention, the screw-like body 104 can be rotated using a minus driver 1001 that is normally carried by an operator who works on the instrument box 101. Thereby, the burden on the operator concerning the rotation of the screw-like body 104 can be reduced, and the working efficiency for opening and closing the instrument box 101 can be improved as compared with the instrument box 1701.

  Further, the watt-hour protective device 100 according to the embodiment of the present invention is such that the protrusion 403 contacts the base 201 when the screw-like body 104 inserted into the screw insertion holes 202 and 203 rotates by a predetermined angle. The screw stopper 204 which is provided and implement | achieves the stopper member which controls the rotation range of the screw-shaped body 104 is provided.

  According to the watt-hour protective device 100 of the embodiment of the present invention, by restricting the rotation range of the screw-like body 104 by the screw stopper 204, excessive rotation of the screw-like body 104 is prevented and the screw-like body is prevented. The screw-like body 104 can be inserted into and removed from the instrument box 101 simply by rotating the 104 as much as necessary. Thereby, the burden on the operator concerning the rotation of the screw-like body 104 can be reduced, and the working efficiency for opening and closing the instrument box 101 can be improved as compared with the instrument box 1701.

  As described above, the watt-hour protective device according to the present invention is useful for the watt-hour protective device for protecting the watt-hour meter, and in particular, the electric power for protecting the watt-hour meter installed in an environment exposed to rain dew. Suitable for measuring equipment for metering.

DESCRIPTION OF SYMBOLS 100 Electricity meter protective instrument 101 Instrument box 102 Cover 104 Screw-shaped body 201 Base 202, 203 Screw insertion hole 404 Sealing hole

Claims (4)

An instrument box that includes a base and a cover, and that accommodates the watt hour meter in a space formed by combining the base and the cover;
A through-hole continuously passing through the base and the cover in a state where the base and the cover are combined;
A screw-like body that is formed using a non-metallic material, includes a sealing hole that penetrates in the insertion / extraction direction with respect to the through-hole, and is removably inserted into the through-hole
In the state where the screw-like body is inserted into the through-hole, a drop-off prevention mechanism for preventing the screw-like body from dropping from the through-hole,
A watt-hour protective device characterized by comprising: The length of the shaft portion of the screw-like body is such that the tip of the screw-like body protrudes outside the instrument box in a state where the screw-like body is inserted into the through hole,
The drop-off prevention mechanism includes a protrusion that engages with the instrument box in a state where the screw-like body is inserted into the through-hole, and the screw from the through-hole is engaged by engaging the protrusion with the instrument box. The watt-hour protective device according to claim 1, wherein the slidable body is prevented from falling off. The length of the shaft portion of the screw-like body is such that the tip of the screw-like body protrudes outside the instrument box in a state where the screw-like body is inserted into the through hole,
The drop-off prevention mechanism includes a protrusion that protrudes in a direction intersecting the insertion direction of the screw-like body, and a groove that is provided on the instrument box and allows the protrusion to move when the screw-like body is inserted into and removed from the sealing hole. And preventing the screw-like body from dropping from the through-hole by engaging the protrusion with the instrument box by rotating the screw-like body inserted into the through-hole. The electricity meter protection device according to claim 1.   The base is provided with a stopper member that is provided at a position where the protrusion abuts when the screw-like body inserted into the through hole rotates by a predetermined angle and restricts a rotation range of the screw-like body. The watt-hour protective device according to claim 2 or 3.

Images