JPH037911Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a security device that protects electronic equipment such as communication equipment from surges and the like.

B. Prior Art Conventionally, as this type of device, the one of Utility Model Publication No. 17602/1983 is known. This safety device has a container-shaped base made of an electrically insulating material, and has a connection terminal for connecting to an external wire passed through the periphery of the base, and is installed inside the base and integrally with the base on the side surface. An overvoltage protection element is laminated inside a housing cylinder having an opening, a convex lid is fixed to the housing cylinder with a screw, and a spring is attached to the convex part of the convex lid to prevent the inside of the housing cylinder from being damaged. This is to press the protective elements, terminals, etc. of the device.

However, the above-mentioned conventional safety device has a complicated shape, such as a container-shaped base with an integrated housing tube for housing the overvoltage protector, making it difficult to assemble and inspect. It has the disadvantage of being inconvenient. In other words, since the required number of overvoltage protectors and terminals are stacked and placed inside the housing cylinder from the upper opening in a predetermined order, it is necessary to pay attention to the housing order and replace each protection element. When making changes, etc., you have to take out everything. In addition, the overvoltage protector, terminals, etc. housed inside the housing tube are brought into contact with each other by being pressed by a spring disposed on the convex lid disposed at the opening of the housing tube when the lid is closed. In Although,
Since multiple protectors, terminals, etc. are brought into elastic contact with springs at the same time as the lid of the housing tube is closed, it is not sufficient to check through the openings on the side of the housing tube, and it is not sufficient to check the various parts inside the housing tube. It is not possible to check the contact status in advance, leading to reliability problems. In addition, connecting wires for overvoltage protectors, terminals, etc. are drawn out from the openings on the side of the housing tube, and are then stretched over the base and connected to the connecting terminals arranged around the periphery of the base. Since it is exposed and wired in a narrow part of the container-shaped base, it is not easy to fix it, and therefore, the reliability is poor and the assembly work is not easy.

Furthermore, in the case of conventional safety devices, each component is provided inside a container-shaped base, which has the disadvantage that the shape of the base itself becomes large and the overall shape becomes large. Due to the complicated shape, such as the provision of a housing tube integrally with the stand, there is a problem in that the manufacturing cost is high and the product cost is also high.

C. Problems to be solved by the invention This invention solves the problems with the conventional devices mentioned above, namely, it is inconvenient to handle such as assembly and inspection, there are problems with reliability, the shape is complicated and large, and the cost is high. This solves the problem that it cannot be manufactured at low cost.

D. Means for Solving the Problems In order to solve the above problems, the security device of the present invention has a connection terminal for external wires on the peripheral edge of a plate-shaped base made of electrically insulating material. A plurality of containers made of electrically insulating material and having recesses on the inside are installed on the base, and the recesses of the containers are equipped with the necessary number of overvoltage protectors and terminals. The plates and contact plates are housed in a row, and the setscrews of the retaining plates arranged at both ends are tightened to bring them into close contact with each other, or an overvoltage protector is connected to the terminal fittings arranged in the recess, and the above-mentioned device is The body is covered with a lid made of the same material and the same shape, and the terminal board, terminal fittings, or lead wires of the overvoltage protector are inserted into the base, and the back side is formed on the back of the base. It is characterized in that wiring is routed inside the recess and connected to a predetermined connection terminal.

E. Function The safety device of the present invention includes a plurality of containers arranged on a base, and a necessary number of overvoltage protectors, terminal plates, and contact plates arranged in a row in the recesses of the containers, and placed at both ends. This is because the overvoltage protector is connected to the terminal fittings placed in the recesses by tightening the setscrews of the presser plates so that they come into close contact with each other, or by connecting the overvoltage protectors to the terminal fittings placed in the recesses
Assembly and inspection are extremely easy. Since the overvoltage protector, terminal plate, and contact plate are housed in a row in the recess of the container body, each part can be replaced or changed freely. In addition, the overvoltage protector, terminal board, contact plate, etc. housed in the recess of the container body are tightened with the set screws of the holding plates at both ends and are brought into contact with each other, and then closed with the lid body. , the contact status of each part inside the vessel can be confirmed in advance. In addition, the lead wires of the terminal board, terminal fittings, or overvoltage protector housed in the device are inserted into the base, and wired inside the recess formed on the back of the base to connect to the specified connection terminal. By doing so, the connection wiring is not exposed on the surface and wiring can be efficiently and safely processed on the back of the base.

Furthermore, in the device of the present invention, the base is formed into a plate shape, and the container with the recess placed on the base and the lid attached to the container are formed in the same shape. Therefore, the shape of the insulator part in the device can be simplified, the number of manufacturing molds can be reduced, and each component can be efficiently arranged on the base.

F. Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

First, a circuit configuration in an embodiment of the present invention will be explained. In general, security devices that protect communication equipment from surges that enter through its communication lines include:
There are various conditions depending on the circuit of communication equipment and the withstand voltage of communication equipment, but in this invention, for example, the first
This is related to the circuit constructed from the circuit diagram shown in the figure.

The safety device shown in FIG. 1 includes connection terminals 1 and 2 and a ground terminal 3, and the intermediate electrode of a three-pole lightning arrester 13 is connected to the ground terminal 3, and the other electrodes of the lightning arrester 13 are connected via varistors 11 and 12, respectively. is connected to connection terminals 1 and 2 to form a protector. Further, the other side is provided with connection terminals 4 to 9 and a ground terminal 10, connection terminals 4 and 6, 6 and 8 and terminals 5 and 7,
Between 7 and 9 are connected the yoke coils 17 and 21 and the yoke coils 18 and 22, respectively, and the connection terminal 4
and 5, the intermediate electrode of the three-pole lightning arrester 16 is connected to the ground terminal 10, and the other electrodes are connected via varistors 14 and 15, respectively, and the connecting terminal 6
and 7 consists of a protector to which a two-pole lightning arrester 20 and a varistor 19 are connected.

In the safety device consisting of these two protectors, connection terminals 1 and 2 are connected to the power supply, earth terminals 3 and 10 are grounded, and connection terminals 4 to 9 are connected to connection lines from communication equipment, etc. Ru.

A lightning arrester 13 is used to protect against surges in the power supply section.
and a protector consisting of varistors 11 and 12. Furthermore, surges to the communication lines connected to terminals 4 to 9 are caused by the surge arrester 16 and varistors 14 and 15 connected between terminals 4 and 5, the surge arrester 20 and varistor 19 connected between terminals 6 and 7, and the surge arrester 17 connected between terminals 4 and 5. , 18, 21, 22 handle the surge.

As the security device handles surges in this manner, communication equipment is protected from surges.

The present invention relates to a safety device having the circuit configuration as described above, and the specific structure thereof will be explained below with reference to the drawings. FIG. 2 is a front view of the security device, FIG. 3 is a side view, FIG. 4 is a plan view, and FIG. 5 is a bottom view.

In these figures, 30 is a generally plate-shaped base made of an electrically insulating material, and 50 is a base with a recess 50a containing the necessary number of overvoltage protectors, terminal boards, contact plates, etc. A container body made of an electrically insulating material is mounted on the container body 50, and a lid body 60 is made of the same material and has the same shape as the container body 50 and is attached to the container body 50. Further, reference numerals 1 to 10 are connection terminals corresponding to the circuit diagram of FIG.
Reference numerals 1 and 22 denote chiyoke coils arranged on the base 30 and corresponding to the circuit diagram shown in FIG. 1 above. Reference numeral 61 denotes a name plate disposed on the lid 60 and having a circuit diagram or a predetermined display.

Although not shown, the recess 30 on the back surface of the base 30
A is closed with a thin plate-like back cover made of an electrically insulating material.

When configured according to the circuit diagram in Figure 1, the base 3
Two of the containers 50 disposed on the base 30 accommodate the circuit components a and b of the circuit diagram in FIG. 1, and are located on both sides of the base 30. The remaining one accommodates the circuit component c in the circuit diagram of FIG. 1, and is located in the center on the base 30. The specific structure in the recess 50a of the body 50 of the circuit component a is an overvoltage protector (surge arrester 13), an overvoltage protector (varistors 11, 12), and a terminal plate 7.
0a, 70b, 70c, 70d and contact plate 75
a, 75b, 75c, 75d and auxiliary contact plate 80
a, 80b, and presser plates 81a, 81b. Similarly, circuit component b also includes an overvoltage protector (surge arrester 16) and an overvoltage protector (varistor 1).
4, 15), each of the above-mentioned terminal plates, a contact plate, an auxiliary contact plate, and a holding plate. In addition, the circuit component c includes an overvoltage protector 20' (a combination of a two-pole lightning arrester 20 and a varistor 19) and a terminal board 85.
a, 85b.

As shown in FIGS. 6 and 7, the lightning arresters 13 and 16 are formed in a circular shape, with a neutral electrode 23 disposed in the center and two other electrodes 24 and 2 on both sides.
5 is disposed, and an insertion hole 26 for connecting a lead wire is formed in the neutral electrode 23. Also barista 1
1, 12, 14, and 15, as shown in FIGS. 8 and 9, are entirely formed in the shape of a thin disk, and electrodes are disposed on both sides.

Also, terminal plates 70a, 70b, 70c, 70d
As shown in FIGS. 10 and 11, an elastic contact piece 71 is formed in the center of a rectangular conductive metal thin plate, and contact plates 75a, 75b, 75c, and 7 are formed in the lower part.
A locking piece 72 is formed for locking the outer edge of 5d, and an insertion hole 73 for connecting a lead wire is formed. Also contact plates 75a, 75b, 75c, 75
As shown in FIGS. 12 and 13, d is composed of a relatively thick conductive annular metal fitting 76 and a circular conductive thin metal plate 77 attached to one side of the metal plate 76. A plurality of elastic contact pieces 78 are formed outwardly. Also, the auxiliary contact plate 8
0a and 80b are formed into a dish shape as shown in FIG. 14, and the holding plates 81a and 81b are rectangular metal plates with internal threads 82 carved in the center for screwing hexagon socket set screws 83a and 83b. It is set up.

Further, FIG. 15 shows an overvoltage protector 20', which is a combination of a lightning arrester 20 and a varistor 19, coated with insulation, and having lead wires drawn out from both sides.

16 and 17 show terminal plates 85a and 85b for attaching the overvoltage protector 20'.
It is formed into an L shape, and its horizontal part is cut and raised to form a terminal part 86 for connecting the lead wire of the overvoltage protector 20', and by cutting and raising this terminal part 86, a mounting hole is formed in the horizontal part. Form 87.

Figure 18 shows the chain coils 17, 18, 21,
22, with mounting legs 88, 88 disposed horizontally on both sides.

On the other hand, the container body 50 for accommodating the overvoltage protector, terminal board, etc. has a convex portion 51 formed in the center for arranging the overvoltage protector (surge arrester 13, 16). The lightning arresters 13 and 16 are mounted to adjust the height, and the neutral electrode 23 of the lightning arresters 13 and 16 is placed in the groove 52 formed in the convex portion 51.
It is possible to position it by fitting it. Overvoltage protectors (varistors 11, 1
A circular convex portion 53 is formed on which the outer peripheral portions of the varistors 2 and varistors 14 and 15 are placed, and presser plates 8 are provided at both ends.
A recess 54 is formed for erecting 1a and 81b. 55 is a recess formed on the outside of the recess 54 to release the setscrews 83a and 83b, and 56 is a lid 6.
0, 57, 57 are engagement holes provided in the bottom wall 58 for positioning when attaching to the base 30, and 59a is a hole drilled through the bottom wall 58 for the insertion of a plurality of lead wires. Hole 59b indicates a screw hole for mounting. The depth of the container body 50 is such that it can accommodate approximately the lower half of the overvoltage protector, terminal plate, contact plate, etc., so that these members can be easily attached and detached.

Note that the lid body 60 is also configured in exactly the same manner as the container body 50.

Next, FIGS. 21 and 22 show the base 30 on which the above-mentioned components are attached, and one side of the top surface of the base 30 has a recess 3 in which the vessel body 50, 50, 50 is placed.
1, 31, 31 are formed, and the recesses 31, 31, 3
1 has one engaging protrusion 32, 32 for fitting into the engaging hole 57, 57 of the container body 50 for positioning.
and the other engaging projections 33, 33 are formed, and the recesses 31, 31, 31 communicate with a lead wire insertion hole 59a and a screw hole 59b of the container body 50, and lead wires and mounting screws are inserted therein. Multiple holes 34 for
is open. The height of the engaging protrusions 32, 32 is smaller than the thickness of the bottom wall 58 of the container body 50, and the height of the other engaging protrusions 33, 33 is smaller than the thickness of the bottom wall 58 of the container body 50.
The screw holes 35, 35 for attaching the terminal plates 85a, 85b are formed in the center thereof. Then, the vessel bodies 50, 50, 50 connect the engagement holes 57, 57 formed in the bottom wall 58 to the recesses 31, 31, 31.
The screws are fitted into the engaging protrusions 32, 32 and 33, 33 from the back side of the base 30 and screwed into the screw holes 59b of the container body 50 to fix them. In addition, the center part of the base 30 has chiyoke coils 17, 18,
21, 22, recesses 36, 36 are formed in the center with a step equal to the thickness of the mounting legs 88, 88 of the chiyoke coil.
6 has a plurality of screw holes 37 for mounting, and a plurality of holes 38 for passing lead wires along the recesses 36, 36. Chiyoke coil 1
7, 18, 21, 22 are two recesses 3 each.
The screws disposed at 6 and 36 and passed through the legs 88 and 88 are screwed into the screw holes 37 of the recesses 36 and 36 and fixed. At this time, as shown in FIG. 25, the chiyoke coil overlaps the adjacent leg parts 88, 88 at the step part of the recesses 36, 36, and connects one screw 8.
By tightening them together at 9, it is possible to efficiently install the chiyoke coil horizontally, and the installation space can also be reduced. In addition, a round hole 39 and a slot 40 are drilled in the peripheral edge of the base 30 for penetrating the connection terminals 1 to 10, a screw portion 43 is inserted into the round hole 39, and the base 30 is inserted into the slot 40. An L-shaped conductive metal fitting 44 connected to the threaded portion 43 at the top is inserted.

A recess 30a is formed on the back side of the base 30, and an overvoltage protector and a terminal plate accommodated in the containers 50, 50, 50 on the base 30, or a chiyoke coil are formed in the recess 30a on the back side of the base 30. Lead wires drawn out from the base 30 are collected and wired by passing through the lead wire insertion holes 34 and 38 of the base 30, and these lead wires are connected to predetermined connection terminals 1 to 10 within the recess 30a on the back surface. It will be connected to the lower end connection part of. For this reason, a large number of protrusions 42 are provided within the back recess 30a to form a wiring route between these protrusions 42 so that each lead wire can be wired regularly, safely and reliably. . Although not shown, an indicator line with an arrow at the tip, for example, is formed on the bottom wall of the back recess 30a to indicate the wiring route from the lead wire insertion holes 34 and 38 to a predetermined connection terminal position. I'll keep it.

Now, with reference to FIGS. 23 and 24, a case will be described in which a necessary number of overvoltage protectors, terminal plates, contact plates, etc. are accommodated in the recesses 50a of the containers 50, 50, 50. FIG. 23 shows the inside of the vessel arranged on both sides of the base 30. The lightning arrester 13 is placed in advance in the center of the recess 50a with the electrodes 24 and 25 facing both sides, and is spaced apart. Terminal plates 70a and 70d are arranged on both sides with the elastic contact pieces 71 facing outward, and the neutral electrodes 2 of these lightning arresters 13 are arranged.
Lead wires 90, 91, 92, which are inserted through the container body 50 and the base 30 and connected to predetermined connection terminals, are soldered to the terminal boards 3 and the terminal boards 70a and 70d. Further, presser plates 81a and 81b, which are equipped with set screws 83a and 83b at both ends of the recess 50a, are placed facing each other in an upright manner.

Therefore, the auxiliary contact plate 80a is attached to the elastic contact piece 71 of the terminal plate 70a, and between the terminal plate 70a and the lightning arrester 13, the contact plate 75a, the varistor 11 (or 14, the same applies hereinafter), the contact plate 75b, and the terminal plate 70
b, the elastic contact pieces 78 of the contact plates 75a and 75b are brought into contact with the electrodes on both sides of the varistor 11, and the elastic contact pieces 71 of the terminal plate 70b are brought into contact with the electrodes 24 of the lightning arrester 13. In addition, the lightning arrester 13 and the terminal board 70
Terminal plate 70c, contact plate 75c, varistor 12 (or 15, the same applies hereinafter) and contact plate 75d are also located between d.
is inserted to bring the elastic contact piece 71 of the terminal plate 70c into contact with the electrode 25 of the lightning arrester 13, and the contact plates 75c, 7
The elastic contact pieces 78 of 5d are brought into contact with the electrodes on both sides of the varistor 12, and the auxiliary contact plate 80b is attached to the terminal plate 70d. Then, by tightening the set screws 83a and 83b of the holding plates 81a and 81b at both ends, the lightning arrester 13 and the varistor 1 are housed in a line between the holding plates 81a and 81b.
1, 12, terminal board 70a, 70b, 70c, 70
d, the contact plates 75a, 75b, 75c, 75d and the auxiliary contact plates 80a, 80b are brought into close contact with each other.

Furthermore, FIG. 24 shows the inside of the container disposed at the center of the base 30, and inside the container 50, the base 3 protrudes from the engagement holes 57, 57.
In the screw holes 35, 35 of the engagement protrusions 33, 33 of 0,
Terminal plates 85a and 85b are disposed facing each other by passing screws through the mounting holes 87 in the horizontal portion, and connecting the lead wires of the overvoltage protector 20' to the terminal portions 86.

In order to improve contact, set screws 83 on both ends
It is desirable that the centers of a and 83b and the parts disposed between them, especially the contact portions, be aligned on the same line. For this reason, the auxiliary contact plates 80a and 80b are used to ensure that the tips of the setscrews 83a and 83b abut on predetermined positions to obtain a sufficient tightening effect, and the contact plates 80a and 80b are
5a, 75b, 75c, 75d as terminal plate 70a,
The positioning is performed by being engaged with the engagement pieces 72 of 70b, 70c, and 70d. However, the auxiliary contact plate 80a,
80b is not necessarily necessary, and the contact plate 7
5a, 75b, 75c, and 75d are also terminal boards 70a,
The shapes of the recesses 70b, 70c, and 70d may not be locked, but may simply be brought into contact by changing their shapes or the shape of the recess 50a. In short, the contact plate 75
Since a, 75b, 75c, and 75d are located within the recess 50a and function as conductive spacers, they may be selected to have an appropriate thickness depending on the length of the recess 50a. Furthermore, if the circuit configuration is slightly changed but the container body 50 is to be made general-purpose, the thickness of the contact plate may be changed or the presser plate may be shaped so that its vertical portion extends into the recess 50a of the container body 50. can do. Of course, it is also possible to prepare the container body 50 having the shape and dimensions of the recess 50a that match the circuit configuration. In addition, the base 30
The back side recess 30a may be filled with an insulating synthetic resin material in order to insulate between terminals of different polarities or the elements housed therein, and to protect and ensure electrical connection.

G. Effects of the invention As described above, the safety device of the present invention includes a plurality of containers arranged on a base, and the necessary number of overvoltage protectors, terminal boards, and contact plates installed in the recesses of the containers. They are housed in a row and the set screws of the presser plates placed at both ends are tightened to bring them into close contact with each other, or the overvoltage protector is connected to the terminal fittings placed in the recesses of the container body. These parts can be easily inserted into and removed from the recesses of the container body, making assembly and inspection extremely easy. In addition, since the lid is closed after the parts are stored in the recess of the container,
The contact status of each part inside the container can be confirmed in advance. In addition, the lead wires derived from the electrical components placed on the base are inserted into the base, routed inside the recess on the back of the base, and connected to the connection terminal, so the wiring is safely placed on the back of the base. The wiring is processed to ensure high reliability.

Furthermore, in the device of the present invention, the base is formed into a plate shape, and the vessel body and lid body arranged on the base are formed in the same shape, so the shape is simplified and there are fewer molds to manufacture. This allows each component to be placed compactly on the base.

Furthermore, the device of the present invention has a holding plate fitted with set screws screwed to both ends of the recess formed by the container body and the lid so that the axial directions are facing each other on the same axis, and an auxiliary plate is fitted between these holding plates. Contact plate - terminal board -
A contact plate with a conductive metal thin plate provided with an elastic contact plate, a varistor, a contact plate, a lightning arrester, a terminal plate, a contact plate, a lightning arrester, a terminal plate, a contact plate, and an auxiliary contact plate are successively superposed in a row, and the above-mentioned By tightening the setscrews, the overvoltage protector, etc., and the auxiliary contact plates at both ends are tightened and fixed in the recesses of the container body and lid body, so that electrical and mechanical connections are easily and securely established, and each of the above-mentioned This has the advantage that assembly, disassembly and inspection of the element can be performed extremely easily and quickly.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a security device according to an embodiment of the present invention, FIG. 2 is a front view of a security device according to an embodiment of the present invention, FIG. 3 is a side view, and FIG. 4 is a plan view. Figure 5 is a bottom view, Figure 6 is a front view of the arrester, Figure 7 is a side view, Figure 8 is a front view of the varistor, Figure 9 is a side view, and Figure 10 is a front view of the terminal board. Figure 11 is also a side view, Figure 1
Figure 2 is a perspective view of the contact plate, Figure 13 is a sectional view, Figure 14 is a sectional view of the auxiliary contact plate, Figure 15 is a front view of the overvoltage protector, Figure 16 is a front view of the terminal plate, and Figure 16 is a front view of the terminal plate. Fig. 17 is a side view, Fig. 18 is a front view of the chiyoke coil, Fig. 19 is a plan view of the vessel body, Fig. 20 is a front view, Fig. 21 is a plan view of the base, and Fig. 22 is a plan view of the base. Sectional view taken along line A-A in Figure 2.
Figures 3 and 24 are explanatory diagrams of the inside of the vessel, Figure 25
The figure is an explanatory diagram of a chiyoke coil. 1 to 10... Connection terminal, 11, 12, 14, 1
5, 19... Overvoltage protector (varistor), 13,
16, 20... Overvoltage protector (surge arrester), 30...
...Base, 30a...Back side recess, 50...Vessel body, 5
0a... recess, 60... lid body, 70a, 70b,
70c, 70d...Terminal board, 75a, 75b, 7
5c, 70d... Contact plate, 81a, 81b... Holding plate, 83a, 83b... Set screw, 35a, 85
b...Terminal board.

Claims (1)

[Claims for Utility Model Registration] Recessed portion 3 for arranging the container body 50 on one side of the upper surface
1 is formed, and the recess 31 has one engagement protrusion 32, 32 and the other engagement protrusion 3 for fitting and positioning into the engagement holes 57, 57 of the container body 50.
3 and 33 are formed, and a plurality of holes 34 are formed in the recesses 31, 31, and 31, respectively, to communicate with the lead wire insertion holes 59a and screw holes 59b of the container body 50, and for inserting lead wires and mounting screws. The height of one of the engaging projections 32, 32 is smaller than the wall thickness of the bottom wall 58 of the container body 50, and the height of the other engaging projections 33, 33 is smaller than the thickness of the bottom wall 58 of the container body 50. It is formed larger than the wall thickness of the wall 58, and terminal plates 85a, 85 are provided in the center.
Screw holes 35, 35 are formed for mounting b, and mounting legs 88, 8 of the chiyoke coil are formed in the center.
Recesses 36, 36 having a step with a thickness of
Round hole 39 and slot 40 for penetrating 10
Holes 34 and 38 are provided on the back side for the lead wires to be drawn out from the overvoltage protector, terminal board, chiyoke coil, etc. housed in the housing 50.
A recess 30a on the back surface where the wires are gathered and wired through the
a base 30 provided with a base 30; and an engagement hole 5 that is fitted into the recess 31 of the base 30 and engaged with one of the engagement protrusions 32, 32.
7 and 57, and a container body 50 whose upper surface is covered with a lid body 60, and setscrews 83a and 83b accommodated in both ends of a recess 50a formed by the lid body 60, respectively, with their axial directions on the same axis. Presser plates 81a and 81b are mounted facing each other, and these presser plates 81a and 8
1b, the auxiliary contact plate 80a and the terminal plate 7
0a, a contact plate 75a to which a conductive metal thin plate 77 with an outward elastic contact plate is attached to the side surface, a varistor 11, a contact plate 75b, a lightning arrester 13, a terminal plate 70
c, contact plate 75c, varistor 12, contact plate 75
d. Overlap the terminal plate 70d and the auxiliary contact plate 80b, and attach the auxiliary contact plates 80a and 80b at both ends to the container body 50 and the lid body 60 using the setscrews 83a and 83b.
A safety device comprising: an overvoltage protector that is tightened all at once in a recess;