JP5080342B2 - Reinforcement structure of terminal lid in watt-hour meter - Google Patents

Description

  The present invention relates to a reinforcing structure for a terminal lid in a watt-hour meter that prevents an illegal act of intentionally opening the terminal lid of the watt-hour meter and using the power without permission.

  Usually, the watt hour meter is provided with a terminal portion serving as a connecting portion of the electric wire at the lower end of the meter body. The terminal portion is formed in a box frame shape whose surface is opened, and a terminal lid is fitted on the surface. Specifically, a screw insertion hole is formed in the terminal lid, and a so-called sealing screw is screwed into a screw hole provided in the terminal portion from the front side through the screw insertion hole. In addition, if a fraudulent act is performed by intentionally prying off the terminal lid, an external force is applied to the head of the sealing screw from the aim of suppressing the fraudulent act so that the fraudulent act is clearly understood. Is added, a sealing device made of a synthetic resin having a configuration that easily breaks is fitted (for example, see Patent Document 1).

JP 2007-187517 A (page 3-4, FIGS. 5 and 6)

  However, in the watt-hour meter of the above-mentioned Patent Document 1, a sealing tool is fitted on the head of the sealing screw so as to aim at a deterrent effect against fraud. Some people appear to destroy it, open the terminal cover without permission, commit fraud without permission, and deny it later. Such actions are difficult to find in the field and are currently struggling to find a solution.

  Therefore, the present invention has been made in view of the above problems, and by covering the surface of the terminal lid strictly, the amount of electric power designed to prevent unauthorized actions by preventing the terminal lid from being arbitrarily opened as much as possible. It aims at providing the reinforcement structure of the terminal cover in a meter.

  In order to achieve this object, the reinforcing structure of the terminal lid in the watt-hour meter of the present invention is formed by superposing a metal reinforcing plate on the surface of the terminal lid of the watt-hour meter so as to cover the surface and opening the reinforcing plate on the reinforcing plate. The fixing screw is fixed to the terminal lid by screwing a fixing screw into a screw hole provided in a terminal portion of the watt hour meter through a stepped screw insertion hole, and the fixing screw is screwed. The head does not protrude from the stepped screw insertion hole to the front side, and a removal preventing means is provided on the head.

A metal reinforcing plate is superposed on the surface of the terminal cover of the watt hour meter so as to cover the surface, and is provided in the terminal portion of the watt hour meter through a stepped screw insertion hole established in the reinforcing plate. The reinforcing plate is fixed to the terminal lid by screwing a fixing screw into the screw hole, and the head of the fixing screw that is screwed is prevented from protruding to the front side from the stepped screw insertion hole. And, the head is provided with removal prevention means, and a pair of metal shielding fittings are juxtaposed in a straight line so as to hide the head of the fixing screw along the longitudinal direction of the reinforcing plate surface, Each of the shielding metal fittings is erected so that a standing wall having a through hole is overlapped with one end edge of each shielding metal fitting facing each other, and the other end edge of each shielding metal fitting is provided at both end edges in the longitudinal direction of the reinforcing plate. A locking piece for locking in the formed locking groove is provided, A piece is locked in the locking groove of the reinforcing plate, and a screw is screwed into a screw hole provided in the reinforcing plate in communication with the screw inserting hole through a screw inserting hole provided in the one shielding fitting. Further, a cover-type security lock is attached to the overlapping compatible wall so as to conceal the head of the screwed screw and locked.
At this time, it is preferable to provide a cover wall that bends toward the reinforcing plate at the side edge between the standing wall and the locking piece in each shielding metal fitting.

  The reinforcing structure of the terminal lid in the watt-hour meter according to claim 1 is a stepped structure in which a metal reinforcing plate is superposed on the surface of the terminal lid of the watt-hour meter so as to cover the surface, and the reinforcing plate is opened. The fixing screw is fixed to the terminal lid by screwing the fixing screw into the screw hole provided in the terminal portion of the watt hour meter through the screw insertion hole, and the head of the fixing screw that is screwed is removed from the screw insertion hole. It does not protrude to the front side, and a removal preventing means is provided on the head. Therefore, the surface of the terminal lid is covered and protected by the reinforcing plate. Moreover, the fixing screw is provided with a removal preventing means, and the fixing screw cannot be removed by a normal driver in a normal state. This makes it difficult to intentionally pry the terminal lid open and prevents fraud.

  In addition to the structure of the first aspect, the reinforcing structure of the terminal lid in the watt-hour meter according to claim 2 is a pair of metal shielding fittings so as to hide the head of the fixing screw along the longitudinal direction of the reinforcing plate surface. Are placed side by side in a straight line so that a standing wall with a through hole overlaps one end edge of each shielding metal fitting facing each other, and the other end edge of each shielding metal fitting is in the longitudinal direction of the reinforcing plate. A locking piece for locking in a locking groove formed at both end edges is provided, and the locking piece of each shielding metal is locked to the locking groove of the reinforcing plate and a screw insertion provided in one shielding metal is provided. Screw the screw into the screw hole provided in the reinforcing plate in communication with the screw insertion hole through the hole, and attach the cover type security lock on the overlapping compatibility wall so as to hide the head of the screwed screw It is locked. Therefore, the surface of the terminal lid is covered and protected by the reinforcing plate and the shielding metal fitting. As described above, since the protection is doubled, the protection enhancement is increased and it becomes more difficult to intentionally pry the terminal lid open, thereby improving the fraud prevention effect.

  Embodiments of a terminal lid reinforcing structure (hereinafter simply referred to as “reinforcing structure”) in an watt-hour meter according to the present invention will be described below in detail with reference to the drawings. 1 is a perspective view of a watt hour meter to which the invention according to the first embodiment is applied, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a side sectional view of the same main part, and FIGS. It is a perspective view of a fixing screw.

  Next, the invention according to the first embodiment will be described. The watt hour meter D is covered with a transparent cover member 31 on the front surface of the meter body 30, and the lower end of the meter body 30 is a box-frame-shaped terminal portion 32 for connecting an electric wire. The front surface of the terminal portion 32 is open, and a terminal lid 33 is detachably attached to the front surface. As shown in FIG. 2, the terminal lid 33 is provided with screw insertion holes 34, 34 at two left and right sides thereof. As shown in FIG. 3, these screw insertion holes 34 and 34 are positioned so as to coincide with screw holes 35 and 35 provided in the terminal portion 32, and sealing screws (not shown) are screwed into the screw holes 35 and 35, respectively. It is supposed to be combined. However, the invention according to the second embodiment is the same, but the sealing screw is not used in the first embodiment.

  Further, on the surface of the terminal lid 33, cut and raised portions 36, 36 are provided on both sides of the terminal lid 33 so as to be positioned in the vicinity of the screw insertion holes 34 and project to the front side. This is intended to prevent the sealing screw from rotating, and neither of these raised portions 36, 36 is used. Furthermore, a ridge 37 parallel to the side edge is provided along the side edge on the opposite side of the cut and raised portions 36 and 36. The ridge 37 and the cut and raised portions 36, 36 are set to the same height.

  In FIG. 2, reference numeral 1 denotes a reinforcing plate that is superposed on the surface of the terminal lid 33 so as to cover the surface. The reinforcing plate 1 is usually made of an aluminum alloy or stainless steel, and is formed in a rectangular shape that is slightly larger than the terminal lid 33. Other than the one side edge (cover member side) of the top plate 1a, Side plates 1b are provided around the three side edges. The thickness is set to 2.5 mm, for example. The top plate 1a of the reinforcing plate 1 is provided with stepped screw insertion holes 2 and 2 at positions corresponding to the screw holes 35 in the terminal portion 32 when the top cover 1a is covered with the terminal lid 33. Each stepped screw insertion hole 2 has an elliptical shape that is long in the left-right direction, and a step portion 2a is provided on the inner peripheral surface thereof. Moreover, the depth dimension from the step part 2a in each stepped screw insertion hole 2 to the surface of the top plate 1a is longer than the height dimension of the heads 4a, 4b of the fixing screws 3 (3a, 3b) described later. Is set.

  There are two types of fixing screws 3 used in the first and second embodiments, as shown in FIGS. 4 (a) and (b). One is a normal screw 3a made of stainless steel, and FIG. As shown in (b), the head 4a is set to a thin dimension, and a cross-shaped groove 5a is formed on the upper surface thereof. The other is a special screw 3b made of stainless steel. As shown in FIG. 4B, a special groove 5b as an anti-detachment means is formed on the head 4b. When the special screw 3b is turned by a minus screwdriver, the tip claw (not shown) of the driver is caught in the groove 5b and rotates in the direction in which the special screw 3b is tightened. The groove 5b is formed so that the claw cannot be rotated without being caught in the groove 5b. This is generally called a one-side screw.

  The invention according to the first embodiment is configured as described above, and the reinforcing plate 1 is superposed on the surface of the terminal lid 33 so as to cover the surface with the sealing screw removed from the terminal lid 33. Then, a normal screw 3a which is a fixed screw 3 is inserted into the screw hole 35 in the terminal portion 32 through the stepped screw insertion holes 2 of the reinforcing plate 1 and the screw insertion holes 34 of the terminal lid 33 by a plus driver. Screw together. At this time, the head 4 a of each screw 3 a does not protrude to the outside of the reinforcing plate 1 from each stepped screw insertion hole 2. Further, when a normal screw 3a is used as the fixing screw 3, the tip of the drill is applied to the head 4a of each screw 3a as a means for preventing removal after the screw 3a is screwed, and the groove 5a is eliminated. Further, the special screw 3 b may be used as the fixing screw 3.

  Thus, in the invention according to the first embodiment, the surface of the terminal lid 33 is covered and protected by the metal reinforcing plate 1, and the fixing screw 3 is provided with a removal preventing means. The fixing screw 3, and thus the terminal cover 33 cannot be removed by a normal driver in a normal state. Therefore, it is difficult to deliberately open the terminal lid 33, thereby preventing fraud. In the regular inspection of the watt hour meter D, in order to remove the fixing screw 3, in the case of the normal screw 3a in which the groove 5a of the head 4a is eliminated, the tip of the drill is again pressed against the head 4a. The head 4a is removed and the terminal lid 33 is removed. Further, in the special screw 3b such as a one-side screw, the special screw 3b is loosened and removed by a special tool (not shown), and the terminal lid 33 is removed.

  Next, the invention according to the second embodiment will be described. 5 is a perspective view of a watt-hour meter to which the invention according to the second embodiment is applied, FIG. 6 is an exploded perspective view of the same, FIG. 7 is a side sectional view of the essential part, and FIG. 8 is a front sectional view of the essential part. FIG.

  In the invention according to the second embodiment, a shielding metal fitting 18 to be described later is further fixed to the surface of the reinforcing plate 11 similar to the reinforcing plate 1 used in the invention according to the first embodiment. For this reason, in the second embodiment, the reinforcing plate 11 is usually made of an aluminum alloy or stainless steel and is formed in a rectangular shape that is slightly larger than the terminal lid 33, and one side edge of the top plate 11a. Side plates 11b are provided around the other three peripheral edges except for the cover member side. The thickness is set to 2.5 mm, for example. The top plate 11 a of the reinforcing plate 11 is provided with stepped screw insertion holes 12 at positions corresponding to the screw holes 35 in the terminal portion 32 when the terminal cover 33 is covered. Each stepped screw insertion hole 12 has an elliptical shape that is long in the left-right direction, and a step portion 12a is provided on the inner peripheral surface thereof. Moreover, the depth dimension from the step part 12a in each stepped screw insertion hole 12 to the surface of the top plate 11a is set longer than the height dimension of the heads 4a, 4b of the fixed screw 3 (3a, 3b). Is done.

  The fixing screw 3 used in the invention according to the second embodiment is the same as that of the invention according to the first embodiment as shown in FIGS. Therefore, the detailed description about this is abbreviate | omitted. The reinforcing plate 11 is provided with locking grooves 16 parallel to the respective edges at both ends in the longitudinal direction, and screw holes at predetermined positions, that is, positions close to a standing wall 19 described later of one shielding metal 11. 17 is provided.

  A pair of left and right shielding fittings 18 fixed to the surface of the reinforcing plate 11 are provided, and they are symmetrical. Therefore, for the sake of explanation, only one shielding metal fitting 18 will be described, and the description of the other shielding metal fitting 18 will be omitted. The shielding metal fitting 18 is made of stainless steel and has a rectangular substrate 18a. The substrate 18a has a length in the longitudinal direction that is approximately half the length in the longitudinal direction of the top plate 11a of the reinforcing plate 11, and a size in the short direction is substantially the same as the size in the short direction of the top plate 11a of the reinforcing plate 11. Same dimensions. A standing wall 19 that is bent upward at a right angle is provided on one side edge in the longitudinal direction of the substrate 18 a, and a through hole 20 is formed in the standing wall 19.

  On the other side edge of the substrate 18a, a locking piece 21 that is bent downward at a right angle is provided. Further, an engaging claw 22 extending toward the cover member 31 is provided at the lower end of one side edge of the locking piece 21, that is, one side edge of the cover member 31 side when fixed to the surface of the reinforcing plate 11. Yes. A cover wall 23 that is bent at a right angle toward the reinforcing plate 11 is provided at one end of the substrate 18a in the short direction, that is, the edge opposite to the cover member 31 when fixed to the surface of the reinforcing plate 11. . One shielding fitting 18 is provided with a screw insertion hole 18 b in the vicinity of the standing wall 19.

  In FIGS. 5 and 6, reference numeral 24 denotes a security lock that covers the standing walls 19, 19 of the shielding metal fittings 18 that overlap each other so as not to come off the compatible walls 19, 19. The security lock 24 has a substantially cubic shape, and has an insertion hole 25 for inserting the standing wall 19 of the shield 18 on the lower surface, and a key hole 26 for inserting a key 27 on the upper surface. Then, by inserting the key 27 into the key hole 26 and rotating in the direction in which the key 27 is locked or unlocked, the locking rod 28 crosses the insertion hole 25 from the inner peripheral wall of the insertion hole 25. It has come to appear. Then, by inserting and engaging the locking rod 28 into the through holes 20 and 20 of the compatibility wall 19, both shielding metal fittings 18 and 18 are locked and firmly fixed.

  The invention according to the second embodiment is configured as described above. First, in the same manner as the invention according to the first embodiment, with the sealing screw removed from the terminal lid 33, the surface is placed on the surface of the terminal lid 33. The reinforcing plate 11 is polymerized so as to cover it. Then, a normal screw 3 a that is a fixed screw 3 is inserted into the screw hole 35 in the terminal portion 32 through the stepped screw insertion holes 12 of the reinforcing plate 11 and the screw insertion holes 34 of the terminal lid 33 by a plus driver. Screw together. At this time, the head 4 a of each screw 3 a does not protrude from the stepped screw insertion hole 12 to the outside of the reinforcing plate 11. When a normal screw 3a is used as the fixing screw 3, after the screw is tightened, the tip of the drill is applied to the head 4a of each screw 3a to eliminate the groove 5a. Further, as described above, the special screw 3 b may be used as the fixing screw 3.

  In a state where the reinforcing plate 11 is fixed to the surface of the terminal lid 33, the locking grooves 16 provided at both ends in the longitudinal direction of the reinforcing plate 11 are positioned outside the end edges in the same direction of the terminal lid 33. . In this state, the shields 18 and 18 are arranged so that the standing wall 19 is close to and overlaps the surface of the reinforcing plate 11, and the locking pieces 21 at the ends of the shields 18 are connected to the locking grooves from the surface side. 16 and the engaging claws 22 are engaged with the back surface of the top plate 11 a of the reinforcing plate 11.

  Then, the screw 29 is screwed into the screw hole 17 provided in the reinforcing plate 11 so as to communicate with the screw insertion hole 18 b through the screw insertion hole 18 b of one of the shielding fittings 18. This screw 29 is a normal screw. The head 29a of the screw 29 is also dish-shaped so that the head 29a does not protrude outward from the upper surface of the substrate 18a of the shielding metal fitting 18 when screwed. Furthermore, the compatible walls 19, 19 that overlap in this state are inserted into the insertion hole 25, and the security lock 24 is disposed on the surfaces of the two shielding fittings 18, 18. At this time, the head 29 a of the screw 29 screwed to one of the shielding fittings 18 is hidden by the security lock 24. Then, a key 27 is inserted into the lock hole 26 of the security lock 24 and is rotated in one direction for locking. Thereby, the security lock 24 is firmly fixed, and the security lock 24 cannot be removed from the compatible walls 19, 19, and at the same time, the screw 29 cannot be removed.

  A locking piece 21 and a cover wall 23 are provided on the peripheral edge of the substrate of each shielding metal 18, and when each shielding metal 18 is arranged and fixed on the surface of the reinforcing plate 11, the locking piece 21 is engaged with the inside of the reinforcing plate 11. In addition, the cover wall 23 closes the gap between the surface of the terminal lid 33 and each shielding fitting 18 on the opposite side of the cover member 31. Therefore, it becomes impossible to insert the tip claw of the minus driver into the gap from the opposite side of the cover member 31, and it is impossible to deliberately open the shielding metal fitting 18. In addition, since the edge on the cover member 31 side of both the shielding metal members 18 and 18 is close to the outer peripheral surface of the cover member 31, it is impossible to insert the driver's tip claw from the gap on that side.

  As described above, in the invention according to the second embodiment, the terminal lid 33 is double-covered by overlapping the metal reinforcing plate 11 and the shielding fittings 18 and 18 on the surface of the terminal lid 33. Protected. That is, the screw 29 for fixing the shielding metal fitting 18 is covered with the security lock 24 and cannot be removed, and at the same time, the fixing screw 3 cannot be easily removed by the removal preventing means. Therefore, the protection enhancement is increased and it becomes more difficult to intentionally pry the terminal lid 33 open. Thereby, the fraud prevention effect improves.

  FIGS. 9A to 9D show the second embodiment and other shapes of the shielding fitting. In addition, since all the shielding metal fittings have the same basic configuration as the second embodiment, the same parts are denoted by the same reference numerals, and detailed description thereof is omitted. The pair of left and right shielding fittings 181 and 181 in FIG. Therefore, for the sake of explanation, only one shielding metal 181 will be described, and description of the other shielding metal 181 will be omitted. The shielding fitting 181 is made of stainless steel and has a rectangular substrate 181a. The substrate 181a has a length in the longitudinal direction that is approximately half the length in the longitudinal direction of the top plate 11a of the reinforcing plate 11, and a size in the short direction is substantially equal to the size in the short direction of the top plate 11a of the reinforcing plate 11. Same dimensions. An upright wall 191 that is bent upward at a right angle is provided on one side edge of the substrate 181a in the longitudinal direction, and a through hole 20 is formed in the upright wall 191. On the other side edge of the substrate 181a, a locking piece 21 that is bent downward at a right angle is provided. An engaging claw 22 extending toward the cover member 31 is provided at the lower end of one side edge of the locking piece 21, that is, one side edge of the cover member 31 side when fixed to the surface of the reinforcing plate 11. One shield fitting 181 is provided with a screw insertion hole 18b adjacent to the standing wall 191. The pair of shielding fittings 181 and 181 are also used in the same manner as in the second embodiment.

  A pair of left and right shielding metal fittings 182 and 182 in FIG. One shielding fitting 182 is made of stainless steel and has a rectangular substrate 182a. The substrate 182a has a longitudinal dimension that is approximately half the longitudinal dimension of the top plate 11a of the reinforcing plate 11, and the short dimension is substantially the same as the short dimension of the top plate 11a of the reinforcing plate 11. Same dimensions. An upright wall 192 that is bent upward at a right angle is provided on one side edge of the substrate 182a in the longitudinal direction, and a through hole 20 is formed in the upright wall 192. On the other side edge of the substrate 182a, a locking piece 21 that is bent downward at a right angle is provided. Further, an engaging claw 22 extending toward the cover member 31 is provided at the lower end of one side edge of the locking piece 21, that is, one side edge of the cover member 31 side when fixed to the surface of the reinforcing plate 11. Yes. One shield fitting 182 is provided with a screw insertion hole 18b close to the standing wall 192.

  Similarly, an L-shaped overlapping plate 38 made of stainless steel is fixed to the surfaces of the substrates 182a and 182a of the shielding metal members 182 and 182. The overlapping plate 38 has the same width as the substrate 182a, and a receiving plate 38a that is parallel to the standing wall 192 is provided on one side edge of the overlapping plate 38 so as to be spaced apart from the standing wall 192 of the substrate 182a. Yes. However, because the security lock 24 is biased to one side and is attached to the upright walls 19 and 19, the distance between the upright wall 192 and the receiving plate 38 a is different in each shielding metal 182. The pair of shielding fittings 182 and 182 are also used in the same manner as in the second embodiment.

  A pair of left and right shielding fittings 183 and 183 in FIG. These shielding fittings 183 and 183 have the same configuration except for a part of the pair of shielding fittings 181 and 181 shown in FIG. That is, a standing wall 193 that is bent upward at a right angle is provided at one side edge in the longitudinal direction of the substrate 183a, and a locking piece 21 that is bent at a right angle downward is provided at the other side edge. The direction of the locking claw 22 provided on the locking piece 21 is provided on the side opposite to the shielding metal fittings 181 and 181 shown in FIG. 9 (a), and the shielding metal fitting 183 is attached to the surface of the reinforcing plate 11. When worn, the locking claw 22 protrudes on the opposite side of the cover member 31. These shielding fittings 183 and 183 are also used in the same manner as in the second embodiment.

  FIG. 9D is composed of the left and right shielding metal fittings 181 and 181 of FIG. 9A and the covering plate 39 which is overlapped so as to cover the upper surfaces of both shielding metal parts 181 and 181. Since both the shielding metal members 181 and 181 are configured as described above, the same parts are given the same numbers. Since the covering plate 39 is overlapped on the surfaces of the two shielding fittings 181 and 181, an elongated through-hole 40 through which the compatible walls 191 and 191 juxtaposed in the vicinity of the center is provided in a transverse manner. Further, a cover wall 41 that bends at a right angle downward is provided on one edge of the cover plate 39 in the short direction. And in the state which arranged and fixed both shielding metal fittings 181 and 181 on the upper surface of the top plate 11a of the reinforcement board 11, it inserts in the compatibility wall 191 and 191 through the through-hole 40, and covers the covering board 39 with both shielding metal fittings 181. , 181 to cover the surface. Furthermore, the compatibility walls 191 and 191 are inserted into the insertion hole 25 and the security lock 24 is disposed on the surface of the cover plate 39, and the key 27 is inserted into the lock hole 26 of the security lock 24 and locked. As a result, the security lock 24 is firmly fixed, and the security lock 24 cannot be removed from the compatible walls 191 and 191. At the same time, the screw 29 inserted through the screw insertion hole 18b is also covered by the cover plate 39 and the security lock 24. It becomes impossible to remove.

  10 to 12 show a state in which a shielding metal fitting according to another embodiment is used for a watt hour meter having a large terminal portion. The terminal portion 321 of the watt hour meter D1 is about twice as large as the watt hour meter D shown in FIGS. 5 to 6, and the terminal lid 331 is about twice as wide. Therefore, the reinforcing plate 111 having a size suitable for the terminal cover 331 is fixed to the surface of the terminal cover 331 by screwing the fixing screw 3 (3a). Locking grooves 161 are provided at both ends of the reinforcing plate 111 so as to approach the cover member 31 side.

  On the other hand, the shielding fittings 184 and 184 form a pair of left and right, and have a symmetrical shape. In addition, since the structure of both the shielding metal fittings 184 and 184 is basically the same as that of the shielding metal fitting 18 according to the second embodiment, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted. For the sake of explanation, only one shielding fitting 184 will be described, and the description of the other shielding fitting 184 will be omitted. The shielding fitting 184 is also made of stainless steel and has a rectangular substrate 184a. The substrate 184a has a length in the longitudinal direction that is approximately half the length in the longitudinal direction of the top plate 111a of the reinforcing plate 111, and a dimension in the short side direction is approximately the size in the short direction of the top plate 111a of the reinforcing plate 111. Half dimension. An upright wall 194 that is bent upward at a right angle is provided at one side edge in the longitudinal direction of the substrate 184a so as to move to one side along the edge, and a through hole 20 is formed in the upright wall 194.

  The other side edge of the substrate 184a is provided with a locking piece 211 that is bent downward at a right angle, and a cover wall 231 that is aligned with the locking piece 211. A locking claw 221 protrudes from the locking piece 211 on one side thereof, that is, on the side opposite to the cover member 31. The covering wall 231 is located slightly outside the locking piece 211, and when the locking piece 211 is inserted into the locking groove 161, the covering wall 231 contacts the outer surface of the side plate 111 b of the reinforcing plate 111. It is like that. A covering wall 232 is provided on one side edge of the substrate 184a in the short side direction so as to be located on the outer side. One shield fitting 184 is provided with a screw insertion hole 18b adjacent to the standing wall 194.

  Therefore, first, the reinforcing plate 111 is attached to the surface of the terminal cover 331 using the normal screw 3a which is the fixing screw 3 in a state where the sealing screw is removed from the terminal cover 331 as in the invention according to the first embodiment. Is polymerized. At this time, the head 4 a of each screw 3 a does not protrude from the stepped screw insertion hole 12 to the outside of the reinforcing plate 111. Further, when the normal screw 3a is used, after the screw is tightened, the tip of the drill is applied to the head 4a of each screw 3a so that the groove 5a is eliminated. Further, as described above, the special screw 3 b may be used as the fixing screw 3.

  In a state where the reinforcing plate 111 is fixed to the surface of the terminal lid 331, the locking grooves 161 and 161 provided at both ends in the longitudinal direction of the reinforcing plate 111 are positioned outside the edge in the same direction of the terminal lid 331. doing. In this state, the shielding metal plates 184 and 184 are arranged so that the standing walls 194 are close to and overlap each other on the surface of the reinforcing plate 111, and the locking pieces 211 of the shielding metal fittings 184 are inserted into the locking grooves 161 from the surface side. While inserting, each latching claw 221 is latched to the back surface of the top plate 111 a of the reinforcing plate 111. At this time, the cover walls 231 and 232 of the shielding metal fittings 184 and 184 simultaneously come into contact with the outer peripheral surface of the reinforcing plate 111.

  Then, the screw 29 is screwed into the screw hole 17 that is in communication with the screw insertion hole 18 b and provided in the reinforcing plate 111 via the screw insertion hole 18 b of the one shielding fitting 184. When screwed, the head 29a does not protrude outward from the upper surface of the substrate 184a of the shielding fitting 184. Furthermore, the compatible walls 194 and 194 that overlap in this state are inserted into the insertion hole 25, and the security lock 24 is disposed on the surfaces of the two shielding fittings 184 and 184. At this time, the head 29 a of the screw 29 screwed to one of the shielding fittings 184 is hidden by the security lock 24. Then, the key 27 is inserted into the lock hole 26 of the security lock 24 and locked. As a result, the security lock 24 is firmly fixed, and the security lock 24 cannot be removed from the compatible walls 194, 194. At the same time, the screw 29 inserted through the screw insertion hole 18b is also covered with the security lock 24 and cannot be removed.

  In the invention according to any of the above embodiments, the watt-hour meters D and D1 provided with two screw holes 35 on both sides of the terminal portions 32 and 321 have been described, but one screw hole is provided in each of the terminal portions 32 and 321. That is, the invention according to the first and second embodiments can also be applied to a watt hour meter in which one screw insertion hole is provided in the terminal lid. Moreover, although the stepped screw insertion hole 12 provided in the reinforcing plates 11 and 111 is shown as a long hole in the figure, it may be a normal circular hole.

The perspective view of the watt-hour meter to which the invention which concerns on 1st embodiment is applied. The exploded perspective view. Side surface sectional drawing of the principal part. (A) and (B) are perspective views of a fixing screw. The perspective view of the watt-hour meter to which the invention which concerns on 2nd embodiment is applied. The exploded perspective view. Side surface sectional drawing of the principal part. Front sectional drawing of the principal part. (A) thru | or (D) is a perspective view of the shielding metal fitting which concerns on other embodiment. The perspective view of the watt-hour meter to which the shielding metal fitting which concerns on other embodiment is applied. The exploded perspective view. Side surface sectional drawing of the principal part.

Explanation of symbols

1 Reinforcing plate 2 Stepped screw insertion hole 3 (3a) Fixing screw (normal screw)
3 (3b) Fixed screw (special screw)
4a Head 4b Head 11 Reinforcing plate 12 Stepped screw insertion hole 16 Locking groove 19 Standing wall 20 Through hole 22 Locking claw 24 Security lock 29 Screw 29a Head 32 Terminal portion 33 Terminal lid 35 Screw hole D Electric energy meter

Claims (2)

  A metal reinforcing plate is superposed on the surface of the terminal cover of the watt hour meter so as to cover the surface, and is provided in the terminal portion of the watt hour meter through a stepped screw insertion hole established in the reinforcing plate. The reinforcing plate is fixed to the terminal lid by screwing a fixing screw into the screw hole, and the head of the fixing screw that is screwed is prevented from protruding to the front side from the stepped screw insertion hole. And the reinforcement structure of the terminal cover in the watt-hour meter characterized by the above-mentioned. A metal reinforcing plate is superposed on the surface of the terminal cover of the watt hour meter so as to cover the surface, and is provided in the terminal portion of the watt hour meter through a stepped screw insertion hole established in the reinforcing plate. The reinforcing plate is fixed to the terminal lid by screwing a fixing screw into the screw hole, and the head of the fixing screw that is screwed is prevented from protruding to the front side from the stepped screw insertion hole. And, the head is provided with a removal prevention means,
A pair of metal shielding fittings are juxtaposed in a straight line so as to hide the heads of the fixing screws along the longitudinal direction of the reinforcing plate surface, and through holes are formed at one end edges of the shielding fittings facing each other. The standing wall is set up so that the established standing wall overlaps, and a locking piece is provided at the other end edge of each shielding metal fitting to be locked in a locking groove formed at both end edges in the longitudinal direction of the reinforcing plate. The locking pieces of the respective shielding metal members are engaged with the engaging grooves of the reinforcing plate, and are connected to the screw insertion holes through the screw insertion holes provided in the one shielding metal member, and are provided on the reinforcing plate. A watt-hour meter characterized in that a screw is screwed into a screw hole, and a cover-type security lock is attached and locked to the overlapping compatible wall so as to hide a head of the screwed screw. Terminal lid reinforcement structure.

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