JP2014153080A - Terminal cover fitting structure for terminal board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal cover fitting structure for a terminal board, capable of easily and safely fitting and removing a terminal cover to and from the terminal board.SOLUTION: A structure for fitting a terminal cover 5 to a terminal board 4 comprises: the terminal board 4 on which a plurality of terminals are arranged in parallel; the terminal cover 5 arranged on the terminal board 4 so as to cover the plurality of terminals; and fitting members 6 for fastening and fixing the terminal cover 5 to the terminal board 4. Each fastening member 6 includes: a male screw part formed on a base end part side of the fastening member and fastened to the terminal board 4; a knob part formed at a tip end part of the fastening member and having a larger diameter than the male screw part; a protrusion protruded out radially at a position spaced at a predetermined interval from a base end part of the knob part and having a larger diameter than the knob part; and a hook part formed between the knob part and the protrusion and having a smaller diameter than the knob part. The terminal cover 5 includes communication holes 50 each of which has: an insertion hole into which the knob part is inserted from the rear side toward the front side; and a hooking hole formed by cutting off an upper side of a circular arc part of the insertion hole so as to be connected to the upper side of the insertion hole, and hooked to the hook part from the upper side.

Description

  The present invention relates to an attachment structure of a terminal cover of a terminal block that covers a plurality of terminals arranged on a terminal block of an watt-hour meter, for example.

  Conventionally, when removing the terminal cover of a watt hour meter that has not been removed for a long period of time, the rubber insulation sheet on the back of the terminal cover has stuck to the terminal block due to aging, and the terminal cover screw can be loosened. The terminal cover may not be removed from the terminal block. In this case, as a means for removing the terminal cover to which the terminal block is attached, the tip of a tool such as a screwdriver is inserted between the terminal block and the terminal cover, and the terminal cover is pulled open so as to be separated from the terminal block.

  In addition, as a mounting structure of the terminal cover of the terminal block of the conventional watt-hour meter, for example, the screw for holding the terminal cover on the terminal block is held on the terminal cover so that the screw is not removed from the terminal cover. Is known (Patent Document 1).

JP 2010-096693 A

  When the terminal cover is pry open using a tool as in the prior art, it is necessary to be careful not to damage the terminal cover and to prevent the tip of the tool from touching the terminal. Further, since the loosened screw of the terminal cover may come into contact with the terminal, workability is not good.

  In addition, in the case of the terminal cover mounting structure of the terminal block described in the above publication, since the loosened screw is configured to be held by the terminal cover, the contact of the screw with the terminal can be avoided, but it is fixed to the back surface of the terminal block. Since sticking of the sheet to the terminal block cannot be solved, there remains a problem that contact with the terminal due to the use of a tool cannot be avoided.

  Accordingly, in view of the above problems, the present invention can easily and safely attach and detach the terminal cover to and from the terminal block without using a tool, in addition to preventing contact with the terminal by the screw of the loosened terminal cover. It is an object of the present invention to provide a terminal cover mounting structure for a terminal block.

  The terminal cover mounting structure of the terminal block according to the present invention includes a terminal block in which a plurality of terminals are arranged in parallel, a terminal cover that is disposed on the terminal block so as to cover the plurality of terminals, and a terminal cover on the terminal block. In a terminal block terminal cover mounting structure including a fastening member that is fastened and fixed, the fastening member is formed on a base end side, and is formed on a male screw portion that is screwed to the terminal block, and a distal end portion. A knob having a diameter larger than that of the male screw, a convex portion having a diameter larger than that of the knob, and protruding in a radially outward direction at a predetermined distance from the base end of the knob. And a hook portion having a smaller diameter than the knob portion formed between the convex portions, and the terminal cover includes an insertion hole through which the knob portion is inserted from the rear side toward the front side, and the insertion hole It is formed by cutting out the upper arc-shaped part so as to be connected to the upper side, And a communication hole formed in the engaging hooking hole.

  According to this structure, when removing a terminal cover from a terminal block, the latching hole of a terminal cover is latched from the upper side by the hook part of a fastening member. In this state, by loosening the male thread portion of the fastening member, the convex portion of the fastening member comes into contact with the back surface of the opening peripheral edge portion of the engaging hole of the communication hole. When the male screw part of the fastening member is further loosened, the terminal cover is pushed by the convex part of the fastening member as the male screw part of the fastening member moves, and the terminal cover is pulled away from the terminal block. In this state, the terminal cover is lifted up slightly so that the tab of the fastening member can be removed from the insertion hole, and the hooking portion of the hooking portion of the fastening member is detached, and the knob portion of the fastening member is positioned in the insertion hole. And pull out the terminal cover. Therefore, when removing the terminal cover from the terminal block, it can be easily removed without using a tool such as a screwdriver. Moreover, since the male thread part of a fastening member is only loosened, a fastening member is not removed from a terminal block, and a fastening member does not contact a terminal.

  When the terminal cover is attached to the terminal block, the terminal cover is moved to the terminal block side so that the knob portion of the fastening member is inserted from the rear side to the front side with respect to the insertion hole of the terminal cover. Then, at the position where the knob portion of the fastening member protrudes from the insertion hole of the terminal cover (the position where the convex portion of the fastening member is located behind the terminal cover), the terminal cover is lowered slightly, The inner peripheral surface is hooked to the upper outer peripheral surface of the hooking portion of the fastening member. By doing so, the terminal cover is fixed. Therefore, when attaching the terminal cover to the terminal block, the terminal cover can be easily attached without using a tool such as a screwdriver.

  It is assumed that the terminal cover is arranged on the terminal block so as to cover a plurality of terminals of the terminal block. In addition, the descending distance of the terminal cover when the fastening member's knob is inserted into the terminal cover's insertion hole is changed from the state in which the fastening member's knob is inserted into the terminal cover's insertion hole. Very few. For this reason, in both the state in which the tab of the fastening member is inserted through the insertion hole of the terminal cover and the state in which the hooking portion of the fastening member is hooked in the hooking hole of the terminal cover, the terminal cover Multiple terminals on the base are covered and protected. Therefore, the terminal is not exposed to the outside by the movement by the terminal cover, and safety is ensured.

  Further, according to the present invention, an insulating sheet is fixed to the back surface of the terminal cover, and the cross-shaped first cut line is cut vertically and horizontally at the position of the sheet corresponding to the insertion hole. It is preferable that the first cut portion is formed rarely.

  In this case, even if the insulating sheet is fixed to the back surface of the terminal cover, the knob portion of the fastening member can pierce the sheet by the first cut portion formed by the first cross-shaped cut line, The insertion / removal of the insertion hole of the terminal cover with respect to the knob portion of the fastening member in the front-rear direction is easily performed.

  Further, according to the present invention, a linear second cut line is cut in the vertical direction at the position of the sheet corresponding to the retaining hole to form a second cut part, and the second cut line is Of the first cross-shaped cut lines, it is preferable that the first cut lines are connected in the vertical direction.

  In this case, even if the insulating sheet is fixed to the back surface of the terminal cover, the linear second cut line of the second cut portion cut in the vertical direction is the second vertical cut line of the first cut portion. Since it is connected to one cut line, the knob part of the fastening member can move from the first cut line in the vertical direction of the first cut part through the linear second cut line of the second cut part. The hooking hole of the terminal cover with respect to the knob portion of the fastening member can be easily hooked up and down in the vertical direction.

  Further, according to the present invention, the knob portion may adopt a configuration in which a through-hole of the sealing string-like member is formed and the terminal cover is formed with a through-ring of the sealing string-like member. it can.

  According to such a configuration, the sealing string-like member is inserted into the through hole of the knob portion of the fastening member and the through ring of the terminal cover, so that the operation of loosening the fastening member cannot be performed, and the terminal cover can be easily removed from the terminal block. Can no longer be removed. Therefore, safety in protecting a plurality of terminals of the terminal block is further ensured.

  Further, according to the present invention, the terminal block is a terminal block suspended from a single-phase two-wire watt-hour meter, a single-phase three-wire watt-hour meter, and a three-phase three-wire watt-hour meter. Yes, in the case of a single-phase two-wire watt hour meter, the communication hole is one at the center of the terminal cover, in the case of a single-phase three-wire watt hour meter and a three-phase three-wire watt hour meter Further, it is possible to adopt a structure formed on both sides of the terminal cover.

  According to this configuration, the terminal cover can be easily attached / detached even when the width dimension of the terminal block differs depending on the type of watt-hour meter. That is, the mounting structure of the terminal cover of the terminal block according to the present invention is suitable for the watt hour meter.

  According to the present invention, it is possible to easily and safely attach and detach the terminal cover to and from the terminal block without using a tool, in addition to preventing contact of the loosened terminal cover with the screw.

The front view which shows the watt-hour meter which concerns on one Embodiment of this invention. The enlarged front view which shows the terminal block of the watt-hour meter from which the terminal cover was removed based on the embodiment. The convex part of a fastening member latches in the latching hole of the communication hole in the terminal cover of the watt-hour meter which concerns on the embodiment, and the state which sealed the terminal cover and fastening member of the watt-hour meter by the sealing string-like member FIG. The enlarged view of the communicating hole in the terminal cover of the watt-hour meter which concerns on the embodiment. The figure which shows the fastening member which fastens the terminal block and terminal cover of the watt-hour meter which concern on the embodiment. The disassembled perspective view of the terminal block, fastening member, and terminal cover of the watt-hour meter which concerns on the embodiment. (A) is a figure which shows the state which the convex part of a fastening member latches in the latching hole of the communicating hole in a terminal cover, (b) is a terminal cover pulled away from a terminal block as the fastening member is loosened. The figure which shows the state which is removed, (c) is a figure which shows the state which removes the knob | pick part of a fastening member from the latching hole of a communicating hole, and removes a terminal cover. The perspective view which shows the state which attaches a terminal cover to the terminal block of the watt-hour meter which concerns on other embodiment.

  An embodiment of a terminal block terminal cover mounting structure according to the present invention will be described with reference to FIGS. In addition, in this embodiment, it demonstrates taking the case of the terminal cover attachment structure of the terminal block suspended from the watt hour meter. The types of watt-hour meter include a single-phase two-wire type, a single-phase three-wire type, and a three-phase three-wire type. In this embodiment, a single-phase three-wire watt-hour meter (three-phase three A linear watt-hour meter will be described as an example.

  As shown in FIG. 1, the watt-hour meter 1 according to the present embodiment includes a housing 2 made of a transparent resin having a substantially rectangular parallelepiped shape, a watt-hour meter body 3 accommodated in the housing 2, and a bottom surface of the housing 2. A terminal block 4 suspended from the outer edge of the back side and a terminal cover 5 covering the bottom surface of the housing 2 and the terminal block 4 are provided.

  The housing 2 is attached to a substantially rectangular back plate (not shown) that is longer than the longitudinal dimension of the housing 2. In addition, the measurement value is displayed on the upper part of the front surface of the housing 2.

  Although not shown, the watt-hour meter body 3 includes voltage / current measuring means for measuring voltage and current, and a measured value based on the voltage value and current value, specifically, a currently measured current value. And a display unit for displaying a measured final value determined at a predetermined date, a CPU (Central Processing Unit) (control means) for controlling the display unit to display the measured value, and an external command Command supply means for supplying to

  The terminal block 4 has an input electric wire (power supply side electric wire) and an output electric wire (load side electric wire) so that the above-mentioned watt-hour meter main body 3 is inserted in the middle of the electric wire between the commercial power supply and the load device. Is connected. A terminal cover 5 is attached to the terminal block 4 by a pair of fastening members 6 and 6. Then, when the terminal cover 5 is removed from the terminal block 4, screw holes 41, 41 into which male screw portions 60 of the fastening member 6 described later are screwed are formed on the left and right side portions of the terminal block 4 as shown in FIG. 2. Is formed.

  Further, when the terminal cover 5 is removed from the terminal block 4, the terminals 40,... Of the charging unit arranged on the terminal block 4 are exposed as shown in FIG. As the terminals 40 of the charging unit, there are an input terminal for connecting an input electric wire from a commercial power source to the watt hour meter main body 3 and an output terminal for connecting an output electric wire to the load device to the watt hour meter main body.

  As shown in FIG. 6, the terminal cover 5 has a rectangular board 5a whose front is elongated in the left-right direction, and bent pieces 5b, 5b bent in the same direction from both ends of the board. As shown in FIGS. 3 and 4, a pair of communication holes (so-called harpoon holes) 50 and 50 through which the fastening member 6 is inserted and removed are formed on the left and right sides of the substrate 5 a. . The communication hole 50 includes an insertion hole 50a through which a knob 61 of the fastening member 6 described later is inserted from the rear side to the front side, and an upper arcuate portion so as to be connected to the upper side of the insertion hole 50a. It is formed by a notch, and is constituted by a latching hole 50b that latches on the hooking portion of the fastening member 6 from above.

  As shown in FIG. 5, the fastening member 6 is formed on the base end side, and has a male screw portion 60 that is screwed into the screw holes 41, 41 of the terminal block 4, and a male screw portion 60 that is formed at the distal end portion. A large-diameter knob 61, a convex portion 62 having a larger diameter than the knob protruding in the radially outward direction at a predetermined distance from the proximal end of the knob 61, the knob 61 and the convex The hook portion 63 is formed between the portions 62 and has a smaller diameter than the knob portion 61.

  Further, the knob portion 61 of the fastening member 6 has a columnar shape that can be inserted into and removed from the insertion hole 50 a of the communication hole 50 in the terminal cover 5 and can be hooked into and removed from the hooking hole 50 b of the communication hole 50. The knob 61 has a length that protrudes to the outside in a state of being inserted through the insertion hole 50 a of the terminal cover 5. And the length of the knob | pick part 61 which protrudes outside from the insertion hole 50a is set to the length which an operator can hold with a finger | toe. Further, a groove 61b into which the tip of the driver is inserted is formed on the end surface on the tip side of the knob 61.

  Further, a through hole 61 a of the sealing string-like member 8 is formed at the protruding portion of the knob portion 61. On the other hand, the terminal cover 5 is formed with a threading ring 51 for the sealing string member 8. As shown in FIG. 3, the sealing string member 8 is inserted through the through hole 61 a of the knob 61 of the fastening member 6 and the through ring 51 of the terminal cover 5. And since the both ends of the sealing string-like member 8 are sandwiched between the sealing members 9, the fastening member 6 cannot be loosened, and the terminal cover 5 cannot be easily removed from the terminal block 4. Therefore, safety in protecting the plurality of terminals 40 of the terminal block 4 is further ensured.

  As shown in FIG. 4, the convex portion 62 of the fastening member 6 protrudes radially outward from the proximal end portion of the knob portion 61 at a position having a predetermined distance H. And the convex part 62 is formed in the annular | circular shape along the outer peripheral surface of the knob | pick part 61. As shown in FIG. The predetermined interval H is an interval between the opposing surfaces of the proximal end portion of the knob portion 61 and the convex portion 62, and the terminal cover is attached by the fastening member 6 as shown in FIG. At this time, the convex portion 62 is set to be positioned behind the opening peripheral edge portion of the latching hole 50 b of the terminal cover 5. Moreover, the convex part 62 mentioned here shall contain not only an annular | circular shape but the circular arc shape and convex shape which have a magnitude | size which does not come out from the latching hole 50b of the terminal cover 5. FIG.

  As shown in FIG. 4, the hook portion 63 of the fastening member 6 is formed to have a smaller diameter than the knob portion 61 and the male screw portion 60. And the space | interval H of the mutual opposing surface of the base end part of the knob | pick part 61 mentioned above and the convex part 62 is set a little larger than the thickness dimension of the terminal cover 5. FIG. That is, the latching hole 50 b of the communication hole 50 of the terminal cover 5 can be inserted into the gap H <b> 2 between the end face on the proximal end side of the knob portion 61 and the convex portion 62.

  Further, as shown in FIGS. 6 and 7, an insulating sheet 7 is fixed to the back surface 5 a of the terminal cover 5. Then, as shown in FIG. 4, first cross-shaped cut lines 70 a and 70 b are cut vertically and horizontally in the position of the sheet 7 corresponding to the insertion hole 50 a of the communication hole 50 of the terminal cover 5. A cut portion 70 is formed. Further, the second cut line 71 is formed by cutting the linear second cut line 71 a in the vertical direction at the position of the sheet 7 corresponding to the retaining hole 50 b of the communication hole 50 of the terminal cover 5. The second cut line 71a is connected to the first cut line 70a in the vertical direction among the cross-shaped first cut lines 70a and 70b. The first cut line 70b is a cut line cut in the left-right direction.

  Therefore, even if the insulating sheet 7 is fixed to the back surface 5a of the terminal cover 5, the knob 61 of the fastening member 6 is formed by the first cut portions 70 formed by the first cut lines 70a and 70b having a cross shape. Can break through the sheet 7, and the insertion / removal in the front-rear direction of the insertion hole 50a of the terminal cover 5 with respect to the knob 61 of the fastening member 6 is easily performed.

  Moreover, since the linear 2nd cut line 71a of the 2nd cut part 71 cut | disconnected in the up-down direction is connected with the 1st cut line 70a of the up-down direction of the 1st cut part 70, it is hooked of the fastening member 6 Since the part 63 can move from the first cut line 70 a in the vertical direction of the first cut part 70 through the linear second cut line 71 a of the second cut part 71, the hook part 63 of the fastening member 6 can be moved. The hooking hole 50b of the terminal cover 5 is easily hooked up and down.

  Next, a usage mode will be described with reference to FIGS. First, when the terminal cover 5 is removed from the terminal block 4, the hooking hole 50 b of the communication hole 50 in the terminal cover 5 is hooked to the hooking portion 63 of the fastening member 6 as shown in FIG. . In this state, it operates via the knob | pick part 61 so that the fastening member 6 may be loosened. At this time, as shown by a solid line in FIG. 7B, the convex portion 62 of the fastening member 6 abuts on the back surface of the opening peripheral portion of the latching hole 50 b of the communication hole 50. When the fastening member 6 is further loosened, the terminal cover 5 is pushed by the convex portion 62 of the fastening member 6 as the male screw portion 60 of the fastening member 6 moves as shown by the chain line in FIG. The terminal cover 5 is pulled away from the terminal block 4. In this state, as shown in FIG. 7C, the terminal cover 5 is lifted slightly upward so that the knob 61 of the fastening member 6 is removed from the insertion hole 50a, and the hook 63 of the fastening member 6 is latched. While removing the hole 50b, the knob | pick part 61 of the fastening member 6 is located in the insertion hole 50a, and the terminal cover 5 is pulled out to this side. In this case, since a tool such as a screwdriver is not used when the terminal cover 5 is removed from the terminal block 4, the tip of the tool such as a screwdriver does not contact the terminals 40,. Further, since the terminal cover 5 is not pry open with a tool, the terminal cover 5 is not damaged.

  Next, when the terminal cover 5 is attached to the terminal block 4, the tab cover 61 of the fastening member 6 is inserted from the rear side to the front side with respect to the insertion hole 50 a of the communication hole 50 in the terminal cover 5. 5 is moved to the terminal block 4 side. Then, the terminal cover 5 is slightly lowered at the position where the knob 61 of the fastening member 6 protrudes from the insertion hole 50a of the communication hole 50 (the position where the convex portion 62 of the fastening member 6 is located behind the terminal cover 5). The inner peripheral surface of the hooking hole 50b of the communication hole 50 is hooked on the upper side of the outer peripheral surface of the hooking portion 63 of the fastening member 6 (see FIG. 7B). Thereafter, when the fastening member 6 is tightened, the convex portion 62 of the fastening member 6 is separated from the terminal cover 5 and positioned behind the communication hole 50, and the end surface on the proximal end side of the knob portion 6 of the fastening member 6 is a terminal. It contacts the surface of the cover 5 (see FIG. 7A). By doing so, the terminal cover 5 is fixed. Also in this case, when the terminal cover 5 is attached to the terminal block 4, it can be easily attached without using a tool such as a screwdriver.

  It is a precondition that the terminal cover 5 is arranged on the terminal block 4 so as to cover the plurality of terminals 40 of the terminal block 4. Further, the state in which the knob 61 of the fastening member 6 is inserted into the insertion hole 50 a of the terminal cover 5 is changed to the state in which the hook 63 of the fastening member 6 is hooked to the latching hole 50 b of the terminal cover 5. At this time, since the descending distance of the terminal cover 5 is very small, the state in which the knob 61 of the fastening member 6 is inserted into the insertion hole 50a of the terminal cover 5 and the latching hole 50b of the terminal cover 5 are inserted. The terminal cover 5 covers and protects the plurality of terminals 40 of the terminal block 4 in any state where the hook 63 of the fastening member 6 is hooked. Therefore, the plurality of terminals 40 are not exposed to the outside due to the movement by the terminal cover 5, and safety is ensured.

  Thus, according to the terminal cover mounting structure of the terminal block according to the present embodiment, in addition to preventing contact of the loosened terminal cover 5 with the fastening member 6 to the terminal 40, the terminal block can be used without using a tool. The terminal cover 5 can be attached to and detached from the terminal 4 easily and safely.

  In addition, the terminal cover attachment structure of the terminal block which concerns on this invention can be variously changed without being limited to the said embodiment.

  For example, in the case of the above-described embodiment, the case of a single-phase three-wire watt hour meter and a three-phase three-wire watt hour meter has been described as an example. It can also be applied to cases. In this case, as shown in FIG. 8, one communication hole 50 of the terminal cover 5 is formed at the center of the terminal cover 5. Therefore, according to the present invention, the terminal cover 5 can be easily attached and detached even when the width dimension of the terminal block 4 differs depending on the type of the watt-hour meter 1. That is, the mounting structure of the terminal cover of the terminal block according to the present invention is suitable for the watt hour meter.

  DESCRIPTION OF SYMBOLS 1 ... Electricity meter, 2 ... Housing, 3 ... Electricity meter main body, 4 ... Terminal block, 40 ... Terminal, 41 ... Screw hole, 5 ... Terminal cover, 50 ... Communication hole, 50a ... Insertion hole, 50b ... Latch Hole: 51 ... Through ring, 6 ... Fastening member, 60 ... Male screw part, 61 ... Knob part, 61a ... Through hole, 61b, 61b ... Groove, 62 ... Projection part, 63 ... Hook part, 7 ... Insulating sheet, 70 ... 1st cut part, 70a, 70b ... 1st cut line, 71 ... 2nd cut part, 71a ... 2nd cut line, 8 ... Sealing string-like member, 9 ... Sealing part

The terminal cover mounting structure of the terminal block according to the present invention includes a terminal block in which a plurality of terminals are arranged in parallel, a terminal cover that is disposed on the terminal block so as to cover the plurality of terminals, and a terminal cover on the terminal block. In a terminal block terminal cover mounting structure including a fastening member that is fastened and fixed, the fastening member is formed on a base end side, and is formed on a male screw portion that is screwed to the terminal block, and a distal end portion. A knob having a diameter larger than that of the male screw, a convex portion having a diameter larger than that of the knob, and protruding in a radially outward direction at a predetermined distance from the base end of the knob. And a hook portion having a smaller diameter than the knob portion formed between the convex portions, and the terminal cover includes an insertion hole through which the knob portion is inserted from the rear side toward the front side, and the insertion hole It is formed by cutting out the upper arc-shaped part so as to be connected to the upper side, And a communication hole formed in the engaging hooking hole, further, the terminal cover is a sheet of insulation to be secured to the rear surface of the terminal cover in a position corresponding to the insertion hole, the first cut line cross-shaped is characterized Rukoto comprises a sheet having a first cut portion formed by being cut in the vertical and horizontal directions.

When the terminal cover is attached to the terminal block, the terminal cover is moved to the terminal block side so that the knob portion of the fastening member is inserted from the rear side to the front side with respect to the insertion hole of the terminal cover. Then, at the position where the knob portion of the fastening member protrudes from the insertion hole of the terminal cover (the position where the convex portion of the fastening member is located behind the terminal cover), the terminal cover is lowered slightly, The inner peripheral surface is hooked to the upper outer peripheral surface of the hooking portion of the fastening member. By doing so, the terminal cover is fixed. Therefore, when attaching the terminal cover to the terminal block, the terminal cover can be easily attached without using a tool such as a screwdriver.
In addition, even if an insulating sheet is fixed to the back surface of the terminal cover, the first cut portion formed by the first cross-shaped cut line allows the knob portion of the fastening member to break through the sheet and fasten. The insertion / removal of the insertion hole of the terminal cover with respect to the knob portion of the member in the front-rear direction is easily performed.

Claims (5)

A terminal block including a terminal block in which a plurality of terminals are arranged in parallel, a terminal cover disposed on the terminal block so as to cover the plurality of terminals, and a fastening member that fastens and fixes the terminal cover to the terminal block In the terminal cover mounting structure of
The fastening member is formed on the base end side, and has a male screw part screwed into the terminal block, a knob part formed on the tip part and having a larger diameter than the male screw part, and a predetermined distance from the base end part of the knob part. Consists of a convex portion having a larger diameter than the knob portion, and a hook portion having a smaller diameter than the knob portion, which is formed between the knob portion and the convex portion. And
The terminal cover is formed with an insertion hole through which the knob portion is inserted from the rear side toward the front side, and an arcuate portion on the upper side so as to be continuous with the upper side of the insertion hole. A terminal cover mounting structure for a terminal block, comprising: a communication hole including a hook hole that is hooked on the portion from above.   An insulating sheet is fixed to the back surface of the terminal cover, and a cross-shaped first cut line is cut vertically and horizontally at the position of the sheet corresponding to the insertion hole to form a first cut portion. The terminal cover mounting structure of the terminal block according to claim 1, wherein   A straight second cut line is vertically cut at the position of the sheet corresponding to the retaining hole to form a second cut portion, and the second cut line is the cross-shaped first cut. 3. The terminal block terminal cover mounting structure according to claim 2, wherein the terminal cover is connected to a first cut line in a vertical direction among the wires.   2. The terminal cover of a terminal block according to claim 1, wherein the knob portion is formed with a through hole of a sealing string member, and the terminal cover is formed with a threading ring of the sealing string member. Mounting structure.   The terminal block is a terminal block that is suspended from a single-phase two-wire watt-hour meter, a single-phase three-wire watt-hour meter, and a three-phase three-wire watt-hour meter. In the case of a phase 2-wire watt hour meter, one at the center of the terminal cover, and in the case of a single-phase three-wire watt hour meter and a three-phase three-wire watt hour meter, on both sides of the terminal cover The terminal block terminal cover mounting structure according to claim 1, wherein the terminal block terminal cover mounting structure is formed.

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