JP2007227122A - Insulation cover for terminal block - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulation cover for a terminal block having a fitting part covering a simple terminal mounted to a mounting hole formed on a terminal block body to prevent a short circuit of the simple terminal. <P>SOLUTION: The insulation cover 10 for a terminal block is used for covering a terminal screw 4 inserted into a screw hole 3 formed in the terminal block body 1A so as to be embedded therein and having an upper surface of a head part 4a exposed, and includes a columnar fitting part 12 fitted to the screw hole 3, and a lid body 11 formed integrally with the base end side of the fitting part 12 and covering an opening end surface 9 of the screw hole 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an insulating cover for a terminal block for insulating a single terminal of a terminal block used for wiring connection between various devices used for process control and the like and the outside.

  In recent years, there has been an increase in electrical equipment or electrical equipment using terminal blocks used for wiring connection between various equipment used for process control and the like and the outside. In such a terminal block, when another metal part falls on the head of the exposed single terminal (terminal screw), the terminals may be short-circuited. In addition, if the wiring cable is a power line, an electric shock will be caused if it contacts the terminal screw by mistake. Further, since each terminal screw is generally not numbered, it may be mistakenly connected to another terminal during wiring. As means for preventing these problems, conventionally, for example, an insulating cover attached so as to cover a terminal screw is known (see Patent Document 1).

  According to this Patent Document 1, as shown in FIGS. 17 and 18, the insulating cover 101 is attached so as to cover the individual terminal screws 106 of the terminal block 100 (see FIG. 18), and has a specific width, depth, It is formed at a height. The insulating cover 101 has a U-shape in which a ceiling plate 102 and a bottom plate 103 are joined by a resilient front plate 104. In addition, an insertion hole 105 for inserting each terminal screw 106 is provided in the approximate center of the bottom plate 103.

When the cover is attached, the front plate 104 is bent upward using its elasticity to stand the ceiling plate 102 substantially vertically. In this state, the terminal screw 106 is screwed into the screw of the terminal block 100 through the hole 105 in the bottom plate 103. Screw into the hole. As a result, the terminal screw 106 is covered with the insulating cover 101, and erroneous connection or the like is prevented.
Japanese Patent Laid-Open No. 5-226011 (second page, FIG. 1)

  However, in the insulating cover of Patent Document 1, for example, a structure in which the head of the terminal screw is inserted so as to be buried in a mounting hole (screw hole) drilled in the terminal block body, and only the upper surface thereof is exposed. Could not be attached to the terminal block. This is because such a terminal block is mainly intended for miniaturization and has a completely different structure from the terminal block of Patent Document 1 in which terminal screws are exposed to the outside. Therefore, at present, in the case of such a terminal block, for example, the upper end portion of the mounting hole (screw hole) is covered with tape or the like so that a dropped part or the like does not contact the upper surface of the buried terminal screw. Was.

  However, the means of applying a tape or the like has a risk of being easily peeled off, and there was anxiety in terms of durability. In addition, there is a problem that the aesthetic appearance of the terminal block is damaged by the affixed tape or the like.

  The present invention was made in order to solve such a problem, and the object is to cover the upper surface of the head of the single terminal inserted so as to be buried in the mounting hole formed in the terminal block body, An object of the present invention is to provide an insulating cover for a terminal block that can prevent a short circuit between single terminals.

  The present invention relates to an insulating cover for a terminal block that is inserted so as to be buried in a mounting hole formed in a terminal block body and covers a single terminal whose head upper surface is exposed. By fitting the portions, it is possible to prevent short-circuiting between single terminals due to falling parts or the like and incorrect wiring. In addition, by having a lid that is integrally formed with this fitting part and covers the opening end face of the mounting hole, an aesthetic appearance is ensured and the insulating cover body can be easily attached and detached during maintenance, etc., and workability is improved. Is planned.

  According to this invention, it has a column-shaped fitting part fitted in the attachment hole formed in the terminal block main body, and the cover body which is integrally formed in this fitting part and covers the opening end surface of the attachment hole. Thus, it is possible to prevent a short circuit between the single terminals while ensuring an aesthetic appearance.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an external appearance of a screw terminal block 1 used for wiring connection between various electric devices used for process control and the like and the outside. 2 is an external view when the screw terminal block 1 is shown as a single unit, and FIG. 3 is a sectional view thereof.

  1 to 3, the screw terminal block 1 is used when various electrical devices are connected to the outside via a cable 2. The screw terminal block 1 is inserted into a terminal block body 1A made of an insulating molding resin into a large number of screw holes (mounting holes) 3 formed in the vertical direction (gravity direction) and the large number of screw holes 3. A terminal screw 4 (single terminal) operated by a minus screwdriver as a dedicated tool, and a conductor portion screwed into the terminal screw 4 and movable in the axial direction of the terminal screw 4 and built in the terminal block body 1A 5.

  The terminal screw 4 has a substantially cylindrical head portion 4a, a tool insertion port 4b formed in the head portion 4a, and a screw portion 4c, and a dedicated tool is inserted into the tool insertion port 4b. The terminal screw 4 is rotated. The screw hole 3 has a large-diameter counterbore part 3a and a small-diameter shaft hole part 3b communicating with the counterbore part 3a via the bottom wall. The counterbore 3a is formed with the head 4a of the terminal screw 4 inserted therein and deeper than the height of the head 4a, and the head 4a of the terminal screw 4 is completely buried by the counterbore 3a. Has been inserted.

  For this reason, when the terminal screw 4 is mounted in the screw hole 3, the head 4a of the terminal screw 4 is located at a position recessed by a predetermined amount inward from the surface of the terminal block main body 1A. In this manner, the head 4a of the terminal screw 4 is prevented from protruding from the surface of the screw terminal block 1, thereby preventing a short circuit between adjacent terminal screws 4 or the like. Note that the minus screw is used as the terminal screw 4 as in this embodiment in consideration of the miniaturization of the screw terminal block 1.

  When the terminal screw 4 is rotated with a dedicated tool while the bottom surface of the head 4a of the terminal screw 4 is in contact with the bottom wall of the counterbore 3a, the terminal screw 4 The screwed conductor portion 5 moves upward. As the conductor portion 5 moves upward, the conductive adjustment plate 7 (see FIGS. 1 and 2) formed integrally with the conductor portion 5 and exposed to the cable insertion port 6 moves upward. Thus, the conducting wire 2 a of the cable 2 is sandwiched between the adjusting plate 7 and the cable insertion port 6. Thereby, various electric equipment and the cable 2 are electrically connected via the screw terminal block 1 (conductor part 5).

In the above, even though the terminal screw 4 is inserted so as to be buried in the screw hole 3, the upper surface of the head 4a of the terminal screw 4 is exposed. It is necessary to prevent a short circuit (short circuit) between the four or prevent miswiring. For this reason, in this embodiment, the screw hole 3 is covered with an insulating cover 10 for terminal block (hereinafter referred to as “insulating cover 10”) made of an insulating synthetic resin. However, the material is not limited to synthetic resin, and may be hard rubber or the like.
(First embodiment)
FIG. 4 is a view showing the appearance of the insulating cover 10 of the present embodiment, and FIG. 5 is a diagram illustrating the case where the insulating cover 10 is attached so as to cover the upper surface of the terminal screw 4 inserted so as to be buried in the screw hole 3 FIG.

  4 and 5, the insulating cover 10 is integrated with a columnar fitting portion 12 fitted to the counterbore portion 3 a of the screw hole 3 and a base end side (upward in the drawing) of the fitting portion 12. And a lid 11 that covers the opening end face 9 (see FIGS. 2 and 3) of the screw hole 3. The fitting portion 12 has a substantially columnar shape in the present embodiment, and is formed with a fitting tolerance that does not easily come out of the counterbore portion 3a when fitted to the counterbore portion 3a. However, when the insulating cover 10 is made of a synthetic resin, the above-described fitting tolerance does not have to be strict in consideration of the elastic action.

  Note that the length of the fitting portion 12 (length in the fitting direction) is not particularly specified, for example, a value obtained by subtracting the length of the head portion 4a of the terminal screw 4 from the overall depth of the counterbore portion 3a. It is preferable that it is substantially equivalent. The lid 11 covers the opening end surface 9 of the screw hole 3 so as not to impair the overall aesthetic appearance. For example, the lid 11 abuts on the opening end surface 9 of the screw hole 3 and the fitting portion 12 of the screw hole 3 is fitted. It serves to regulate the amount of fitting.

  Further, a protrusion 13 that fits into the tool insertion port 4 b of the terminal screw 4 is integrally formed on the distal end side (downward in the drawing) of the fitting portion 12. In the present embodiment, the protrusion 13 has a substantially cylindrical shape (see FIG. 5), and the tool insertion port 4b is fitted in substantially the center of the groove direction of the tool insertion port 4b so that the tool insertion port 4b has any direction. Even if you are facing, you can plug it in. The protrusion 13 is formed with a fitting tolerance that does not easily come out of the tool insertion port 4b when fitted in the tool insertion port 4b.

  However, in the same manner as described above, when the insulating cover 10 is made of a synthetic resin, the fitting tolerance may not be strict considering the elastic action. In addition, the length (length in the fitting direction) of the protrusion 13 is not particularly specified and may be substantially equal to the depth of the tool insertion port 4b of the terminal screw 4. Further, in a state where the terminal screw 4 is inserted into the screw hole 3, a slight gap is formed between the side wall of the screw hole 3 and the side surface of the head 4a of the terminal screw 4 (see FIG. 5).

  As in the present embodiment, both the fitting portion 12 and the protrusion 13 are appropriately fitted to the spot facing portion 3a and the tool insertion port 4b, respectively, so that the holding force when the insulating cover 10 is attached is obtained. It can be further enhanced. In addition, although this embodiment demonstrated the case where holding force was acquired in both the fitting part 12 and the protrusion 13, it is not restricted to this, For example, either one is loosely fitted and the other is moderate fitting tolerance. You may make it fit.

  Further, the insulating cover 10 has a handle portion 14 formed integrally with the lid body 11. The handle portion 14 is provided for convenience when the insulating cover 10 is detached from the counterbore portion 3a. However, the handle portion 14 is attached for convenience and is not always necessary, so that it can be omitted.

According to the present embodiment, by fitting the fitting portion 12 of the insulating cover 10 into the screw hole 3 and covering the open end surface 9 of the screw hole 3 with the lid 11, the terminal screw 4 whose upper surface is exposed can be obtained. A short circuit between the covered terminal screws 4 or the like can be prevented, and entry of dust or the like into the screw hole 3 can be prevented. Furthermore, the overall aesthetic appearance can be ensured.
(Second Embodiment)
FIG. 6 is a view showing the appearance of the insulating cover 10 of the present embodiment, and FIG. 7 is a view showing a state in which the insulating cover 10 is attached so as to cover the terminal screws 4 attached to the screw holes 3. . In addition, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of 1st Embodiment mentioned above, or corresponds.

  6 and 7, the insulating cover 10 includes a columnar fitting portion 12 fitted to the counterbore portion 3a of the screw hole 3 and the fitting portion 12 in substantially the same manner as in the first embodiment. It has a lid 11 that is integrally formed on the base end side (upward in the drawing) and covers the open end face 9 of the screw hole 3. In the present embodiment, the fitting portion 12 has a substantially rectangular cross section, and is fitted to the counterbore portion 3a with an appropriate fit. Thus, by making the fitting part 12 into a substantially rectangular cross section, the fitting tolerance with the counterbore part 3a is made tighter (harder) than the above-described embodiment because the contact area is small. be able to. The fitting part 12 is integrally formed with the same lid 11 as described above.

  Also in the present embodiment, a protrusion 13 that fits into the tool insertion port 4 b of the terminal screw 4 is integrally formed on the distal end side (downward in the drawing) of the fitting portion 12. The protrusion 13 has a substantially cylindrical shape, and is formed so as to fit into the tool insertion port 4b of the terminal screw 4 so as not to easily come out from the tool insertion port 4b. Further, a handle portion 14 is integrally formed on the lid 11 so as to protrude. Further, in a state where the terminal screw 4 is inserted into the screw hole 3, a slight gap is formed between the side wall of the screw hole 3 and the side surface of the head 4a of the terminal screw 4 (see FIG. 7).

  In the present embodiment, as described above, the case where the insulating cover 10 is appropriately fitted by both the fitting portion 12 and the protrusion 13 has been described. However, the present invention is not limited to this. For example, either one is loosely fitted. However, the other may be fitted with an appropriate fitting tolerance.

According to the present embodiment, similarly to the first embodiment, the fitting portion 12 of the insulating cover 10 is fitted into the screw hole 3 so as to cover the terminal screw 4 whose upper surface is exposed and to cover the terminal screw 4. It is possible to prevent a short circuit between them, prevent dust and the like from entering the screw holes 3, and ensure the overall aesthetic appearance.
(Third embodiment)
FIG. 8 is a view showing the appearance of the insulating cover 10 of the present embodiment, and FIG. 9 is a sectional side view of the insulating cover 10 attached to the screw terminal block 1. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of 1st Embodiment mentioned above, or corresponds.

  As in FIG. 4 of the first embodiment, the insulating cover 10 is provided on the substantially cylindrical fitting portion 12 fitted to the spot facing portion 3a, the lid 11, and the tool insertion port 4b. A substantially columnar protrusion 13 to be fitted is integrally formed. A handle 14 is integrally formed on the lid 11.

  In the present embodiment, an arm portion 20 bent in a hook shape (angle θ) from the lid body 11 is extended laterally, and a hook-like hooking portion 21 is formed at the tip of the arm portion 20. . This arm part 20 is comprised with the elastic body. FIG. 8 shows a cross-sectional side view of the insulating cover 10, and the arm 20 and the latch 21 are not shown in plan view, but are considered to have a generally assumed shape. good.

According to the present embodiment, when the insulating cover 10 is attached to the screw terminal block 1, the arm portion 20 bent in the shape of a side view is expanded at a substantially right angle (angle θ≈90 °), and the tip is hooked. The portion 21 is hooked to the edge portion 8 of the terminal block main body 1A by an elastic force. For this reason, the insulating cover 10 once attached to the screw terminal block 1 is not easily detached from the screw terminal block 1 due to the hooking force of the hook portion 21.
(Fourth embodiment)
FIG. 10 is a cross-sectional side view of the insulating cover 10 of the present embodiment, and FIG. 11 is a cross-sectional side view of the insulating cover 10 attached to the screw terminal block 1. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of 1st Embodiment mentioned above, or corresponds.

  As shown in FIG. 10, the insulating cover 10 includes a substantially cylindrical fitting portion 12 fitted to the spot facing portion 3 a, a lid 11 integrally formed with the fitting portion 12, and the lid 11 And a substantially cylindrical protrusion 13 that fits into the tool insertion port 4 b of the terminal screw 4.

  Moreover, in this Embodiment, the ring-shaped cable holding part 15 which one end opened so that the coating | coated part of the cable 2 (refer FIGS. 1-3) connected to the screw terminal block 1 can be hold | maintained, and this cable holding | maintenance And a long and narrow strip-shaped portion 16 that is flexible and connects the portion 15 and the lid 11. The cable holding portion 15, the strip-like portion 16, the lid 11, and the like are integrally formed by a forming unit. The cable holding portion 15 holds the cable 2 with a predetermined elastic force by expanding the ring-shaped opening.

In order to attach the insulating cover 10 to the screw terminal block 1, as shown in FIG. 11, the fitting portion 12 and the protrusion 13 of the insulating cover 10 are connected to the counterbore portion 3a of the screw hole 3 of the screw terminal block 1 with a tool difference. The ring-shaped cable holding portion 15 is hooked on the covering portion of the cable 2 while being fitted into the inlet 4b. In this case, since the ring-shaped cable holding portion 15 holds the covering portion of the cable 2 with an elastic force, even if the insulating cover 10 is extracted from the screw hole 3, it does not easily come off. Thereby, it is possible to prevent the insulating cover 10 from being lost during maintenance or the like.
(Fifth embodiment)
FIG. 12 is a cross-sectional side view of the insulating cover 10 of the present embodiment attached to the screw terminal block 1. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of 1st Embodiment mentioned above, or corresponds.

  In the insulating cover 10 of the present embodiment, the length L of the cable holding portion 15 that holds the covering portion of the cable 2 is formed long in the axial direction of the cable 2. Also in this case, the cable holding portion 15 firmly holds the covering portion of the cable 2 by the elastic force.

Thereby, for example, when the exposed portion of the copper wire portion is processed long during the terminal processing of the cable 2, the excess copper wire portion can be covered with the cable holding portion 15 to be insulated and protected. In this way, the insulation of the exposed part of the cable 2 can be improved.
(Sixth embodiment)
FIG. 13 is a cross-sectional side view of the state in which the insulating cover 10 of the present embodiment is attached to the screw terminal block 1. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of 1st Embodiment mentioned above, or corresponds.

In the insulating cover 10 of the present embodiment, the length of the belt-like portion 16 that connects the cable holding portion 15 and the lid body 11 is formed long enough to allow for a margin. In this way, by forming the band-like portion 16 with a margin, the insulating cover 10 can be used for any screw terminal block 1 without being influenced by the type and size of the screw terminal block 1. In this way, the insulating cover 10 with high versatility can be provided.
(Seventh embodiment)
FIG. 14 is a diagram illustrating an appearance of the insulating cover 10 according to the present embodiment. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of 1st Embodiment mentioned above, or corresponds.

  The insulating cover 10 includes a fitting portion 12 fitted into the counterbore portion 3 a of the screw hole 3 and a rectangular plate-like lid body 11 formed integrally with the fitting portion 12. The fitting portion 12 is formed so as to have an appropriate fit with the spot facing portion 3a. In FIG. 14, for convenience of explanation, the lid body 11, the fitting portion 12, and the like are not shown in thickness.

  Moreover, in this Embodiment, the ring-shaped cable holding part 15 which the one end opened so that the coating | coated part of the cable 2 (refer FIGS. 1-3) connected to the screw terminal block 1 can be hold | maintained similarly to the above. And an elongated belt-like portion 16 that connects the cable holding portion 15 and the lid body 11. The cable holding portion 15 and the belt-like portion 16 are formed integrally with the lid body 11 and the like by a forming means. The cable holding portion 15 is configured to hold the cable 2 with a predetermined elastic force by expanding the ring-shaped opening.

  Further, in the present embodiment, the plurality of insulating covers 10 are arranged in a substantially horizontal row, and the lids 11 of the plurality of insulating covers 10 are connected to each other at the connection portion 17 so as to be freely separated from each other. Accordingly, if a force is applied by hand so as to disconnect the connection portion 17, it can be divided into individual insulating covers 10. Thereby, it can divide | segment into each insulation cover 10 according to the number of the terminal screws 4 to be used.

In the present embodiment, a warning display unit 18 is provided on the surface of each lid 11 with a warning color such as red.
The warning display unit 18 allows the operator to visually recognize that the terminal with the display is an important terminal such as a power supply line. As a result, the operator works with care so that the important terminals do not short-circuit with other terminals or cause an electric shock.

  FIG. 15 is a view showing an insulating cover 10 according to a modification of the present embodiment, and FIG. 16 is a cross-sectional side view of the insulating cover 10 attached to the screw terminal block 1. In FIGS. 15 and 16, for convenience of explanation, the lid body 11 and the fitting portion 12 are not shown in thickness.

In this modification, the configuration is substantially the same as that of the embodiment of FIG. 10 described above, except that a number display unit 19 with numbers attached to the surface of each lid 11 is provided.
Generally, this type of screw terminal block 1 is not actually numbered for each terminal screw 4. Moreover, a large number of terminal screws 4 are arranged in an array on one screw terminal block 1. For this reason, there is a possibility that the operator may be confused or mistaken to which terminal screw 4 the cable 2 should be connected.

  On the other hand, if the number display part 19 is provided in each cover body 11 like this modification, such incorrect connection can be prevented. This point is particularly effective when the cable 2 is replaced.

In this modification, the fitting portion 12 of the insulating cover 10 is fitted into the counterbore portion 3 a of the screw hole 3 of the screw terminal block 1, and the cable 2 covering portion is clamped by the cable holding portion 15 with elastic force. ing.
Here, of the five cables 2 in the figure, for example, when the inner three are power lines and the outer two are signal lines, it is particularly necessary that the three cover the upper side of the terminal screw 4 of the power line. Arise. This is because if the power line is short-circuited, the damage will increase. Therefore, in such a case, the operator can recognize that these three terminal screws 4 are important terminals by covering the terminal screws 4 of the three power supply lines with the insulating cover 10. .

(Appendix 1)
In the insulating cover for the terminal block that covers the single terminal that is inserted so as to be buried in the mounting hole formed in the terminal block body and the upper surface of the head is exposed,
A columnar fitting portion fitted into the mounting hole;
A lid that is integrally formed on the base end side of the fitting portion and covers the opening end surface of the mounting hole,
Insulation cover for terminal block.
(Appendix 2)
It has a projection that is integrally formed on the distal end side of the fitting portion and fits into a tool insertion port formed in the single terminal.
The insulating cover for a terminal block according to Supplementary Note 1, wherein
(Appendix 3)
Having a handle formed integrally with the lid,
The insulation cover for terminal blocks according to appendix 1 or 2, characterized in that.
(Appendix 4)
It has a latching portion that extends from the lid and is latched by an elastic force to an edge portion of the terminal block main body,
The insulating cover for terminal blocks according to any one of appendices 1 to 3, wherein
(Appendix 5)
A cable holding portion that extends from the lid and that is connected to the terminal base body by elastic force;
The insulating cover for terminal blocks according to any one of appendices 1 to 3, wherein
(Appendix 6)
Provided with a warning display on the lid,
The insulating cover for terminal blocks according to any one of appendices 1 to 5, characterized in that:
(Appendix 7)
An identification display unit is provided on the lid,
The insulating cover for terminal blocks according to any one of appendices 1 to 6, characterized in that:
(Appendix 8)
A plurality of terminal block insulating covers according to any one of appendices 1 to 7 are arranged in an aligned manner, and a plurality of terminal block insulating covers are connected to each other so as to be freely connected and separated.
Insulation cover for terminal block.

It is a figure which shows the external appearance of the screw terminal block to which this invention was applied. It is an external view at the time of showing a screw terminal block alone. It is sectional drawing same as the above. It is an external view of embodiment of the insulating cover for terminal blocks. It is a top view of the state which attached the insulating cover same as the above to the screw terminal block. It is an external view of embodiment of the insulating cover for terminal blocks. It is a top view of the state which attached the insulating cover same as the above to the screw terminal block. It is a section side view of an embodiment of an insulating cover for terminal blocks. It is a cross-sectional side view of the state which attached the insulating cover same as the above to the screw terminal block. It is a section side view of an embodiment of an insulating cover for terminal blocks. It is a cross-sectional side view of the state which attached the insulating cover same as the above to the screw terminal block. It is a cross-sectional side view of the state which attached the insulating cover for terminal blocks to the screw terminal block. It is a cross-sectional side view of the state which attached the insulating cover for terminal blocks to the screw terminal block. It is an external view of embodiment of the insulating cover for terminal blocks. It is an external view of the insulating cover for terminal blocks of the modification same as the above. It is an external view of the state which attached the insulating cover for terminal blocks same as the above to the screw terminal block. It is a figure which shows the external appearance of the prior art example of the insulating cover for terminal blocks. It is an external view of the state which attached the insulating cover same as the above to the screw terminal block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw terminal block 1A Terminal block main body 2 Cable 3 Screw hole 3a Counterbore part 3b Shaft hole part 4 Terminal screw 4a Head part 4b Tool insertion port 4c Screw part 5 Conductor part 6 Cable insertion port 7 Adjustment board 8 Edge part 9 Open end face DESCRIPTION OF SYMBOLS 10 Terminal block insulation cover 11 Cover body 12 Fitting part 13 Protrusion 14 Handle part 15 Cable holding part 16 Band-like part 17 Connection part 18 Alarm display part 19 Number display part 20 Arm part 21 Latch part

Claims (1)

In the insulating cover for the terminal block that covers the single terminal that is inserted so as to be buried in the mounting hole formed in the terminal block body and the upper surface of the head is exposed,
A columnar fitting portion fitted into the mounting hole;
A lid that is integrally formed on the base end side of the fitting portion and covers the opening end surface of the mounting hole,
Insulation cover for terminal block.