KR102091576B1 - A high and low voltage distribution panel having earthquake-proof construction - Google Patents

Abstract

The present invention relates to a buffer structure of a switchboard having a rubber elastic body and a dual spring, which comprises a buffer unit installed to vertically move and freely rotate between the ground and a switchboard and a plurality of elastic members enduring twists caused by vibrations of the ground to more effectively block vibrations generated multilaterally in the ground. More specifically, the present invention comprises: a lower plate (10) which is installed and fixed to the ground; an upper plate (20) which accommodates a switchboard away from the lower plate (10) by a predetermined height; at least one upright stand (30) which is formed as a shaft having elastic members (32) coupled to both ends thereof and is installed in a space between the lower plate (10) and the upper plate (20); a buffer unit (40) which comprises a housing (41) installed in a central area of the lower plate and a rotating body (42) downwardly installed in the upper plate to vertically slide and freely rotate in an inner space of the housing; and a buffer member (50) which goes through an outer circumference of the buffer unit (40) and is spirally installed from the top surface of the lower plate (10) to the bottom surface of the upper plate (20).

Description

A high and low voltage distribution panel having earthquake-proof construction}

The present invention relates to a shock absorbing base of a seismic switchboard having a double spring with a tension control function capable of preventing a safety accident in advance by suppressing the shaking of the switchboard by suppressing the shaking of the switchboard when the crust changes due to earthquake or the like, and more specifically Equipped with a shock absorbing unit that is installed to allow vertical rotation as well as vertical movement between the ground and the switchboard, and a plurality of elastic members that endure distortion due to the vibration of the ground, it is possible to more effectively block vibrations occurring at various angles in the ground. It relates to the shock absorbing base of the seismic switchboard with double springs with tension adjustment function.

A switchboard is a device that regularly puts and manages switches, relays, and relays (relays) for the operation or control of power plants and substations, and the operation of electric motors. It serves to safely protect the above devices from the same external influence.

As an example of the above-mentioned switchboard, the public utility model publication No. 20-0485961 "The switchboard enclosure door fixing device" is published, and the technology includes a first magnet member coupled to the lower part and a first magnet member formed by a hook portion on the upper part. A door attachment portion attached to the front of the door, a wire storage portion in which the wire is accommodated to enable winding and unwinding of the wire, a binding portion bound to the ring portion at one end of the wire, and formed under the wire storage portion It is composed of a second magnet member, and is composed of a body part attached to the switchboard case by the second magnet member. In the prior art made of the above configuration, the operator can arbitrarily adjust the opening angle of the switchboard enclosure door when inspecting the switchboard, so that the switchboard can be installed or repaired quickly and safely.

As all the devices installed inside the switchboard share the high-voltage current, it is desirable to use the one with the durability and safety, and in particular, it is possible to safely protect the switchboard from vibrations occurring at various angles due to natural disasters. It should be.

Accordingly, shock-absorbing shock-absorbing structures have been developed by actively utilizing materials having elasticity of their own, such as springs, silicones, and rubbers.

For example, Publication No. 10-2011-0036874 "Seismic device for switchgear using seismic springs" is published, and the technology is installed in a housing that can be adjusted in height to the bottom of the switchboard, and the inner space of the housing. It is a technology to mitigate the shaking of the ground due to earthquakes by inserting a fixed plate to support the ground and inserting a spring between the housing and the fixed plate so that the spring exerts a cushioning effect between the fixed plate and the housing.

As another example, Patent Publication No. 10-1768031 "Seismic Unit for Water Distribution Using a Plate Spring" is published, and the related art is a cylindrical shape in which the vertical spring is inserted and accommodated in the outer periphery of the dish spring. The plate spring vertically placed between the ground and the switchboard is generated by external environmental factors by being composed of fastening bolts made of an elastic body and arranged through the dish spring so that the switchboard can be interlocked with the ground through the seismic unit. The upper and lower vibrations are suppressed, and the elastic body installed as if surrounding the outer circumference of the dish spring serves to suppress horizontal vibrations caused by external environmental factors.

However, the shock absorbing base of the earthquake-resistant switchboard, including the prior arts exemplified above, was unable to effectively control the vibration or vibration generated in various sizes due to the impossibility of controlling the elastic force or the damping force, and the elastic member of the cushioning base worn out over time was exchanged. This was very difficult.

Therefore, the buffering action of the shock absorbing base is made to correspond to the intensity of vibration, thereby actively blocking unnecessary movements to prolong the life of the shock absorbing structure, and furthermore, the supply of a shock absorbing shock absorbing base that can protect the switchboard more safely It is an urgent situation.

Public Utility Model Publication No. 20-0485961 "Door fixing device for switchboard enclosure" Published Patent Publication No. 10-2011-0036874 "Seismic device for switchgear using seismic spring" Registered Patent Publication No. 10-1768031 "Seismic unit for water distribution using a plate spring"

The present invention was created to more actively solve the above-mentioned problems, and by installing an elastic body between the switchboard and the ground to configure the switchboard to be safely protected from vibration in the event of an earthquake, as well as corresponding to various magnitudes of magnitude Provides a shock-absorbing buffer base that can actively cope with vibrations occurring at multiple angles by controlling the buffer force by itself to suppress unnecessary movement of the buffer structure and to enable free rotation between the switchboard and the buffer structure within an optimal range. It is a solution.

In order to achieve the above-mentioned problem, the configuration of the shock absorbing base of the seismic switchboard having the double spring with the tension adjustment function proposed in the present invention is as follows.

The present invention is a buffer base installed on the bottom of the switchboard, the lower plate 10 fixedly installed on the ground; and, the upper plate 20 for receiving the switchboard in a state spaced apart from the lower plate 10 by a fixed; and elasticity at both ends A member (32) is formed in the form of a combined shaft is installed at least one or more in the spaced apart space of the lower plate (10) and the upper plate (20); And, the housing (41) installed in the central region of the lower plate , A buffer unit 40 consisting of a rotating body 42 which is installed downward from the upper plate and is installed to enable up and down slide and free rotation on the inner space of the housing; and, through the outer periphery of the buffer unit 40, the lower plate 10 It characterized in that it is composed of; a buffer member 50 is installed in a spiral from the top surface of the top plate 20 from the top surface.

In addition, the elastic member 32 of the upper stand 30 is characterized in that the rubber or silicone material.

In addition, the above buffer member 50 is characterized in that the plurality of springs 51 are formed in a stacked form up and down.

In addition, the above spring 51 is characterized in that the diameter of one end gradually conical.

In addition, the shock absorbing member 50 is characterized in that the support plate 52 is further configured to induce tension between the springs (51).

The upper buffer unit 40 is provided with a bolt portion 42a at the top of the rotating body 42, the upper bolt portion penetrates the upper plate 20 and is fastened by a nut, and according to the tightening of the nut, the lower plate 10 and It characterized in that the tension of the buffer member 50 is controlled while the separation distance of the top plate is adjusted .

In the upper stand 30, the upper and lower fastening portions 31b of the shaft portion 31 are threaded and coupled to a portion of one end side of the tab hole of the elastic member 32, and inserted into the counter bore of the upper plate 20. The bolt penetrates the upper plate 20 and is coupled to a part of the other end side of the tab hole of the elastic member 32 to be fastened by a nut, and the distance between the lower plate 10 and the upper plate is adjusted according to the tightening of the nut, and the buffer is absorbed. Characterized in that the tension of the member 50 is controlled .

According to the present invention made of the above-described configuration, fine vibrations can be effectively absorbed by a plurality of standing stands interposed between the lower plate and the upper plate and elastic members provided at both ends of the standing table, and interposed between the lower plate and the upper plate. The stand is made of a simple coupling structure such as bolt fastening, so it can be quickly and easily replaced when the elastic member wears, so it is easy to install and manage.

In addition, the present invention allows the shock absorber installed in the central region of the lower plate and the upper plate to be freely rotated at multiple angles, and the vibration between the seismic switchboard and the buffer base is quickly and freely generated, and vibrations can occur at various angles. There are other effects to actively respond to.

In addition, the present invention has another advantage that it is possible to control the elastic force between the lower plate and the upper plate to a fine level by adjusting the height of the housing and the rotating body of the buffer unit from the lower plate and the upper plate.

In addition, the present invention is to further enhance the buffering force of the buffer base by stacking at least one buffer member in the outer circumferential region of the buffer unit, and another buffer structure having a shape deformed by vibration can be quickly restored to another state. It works.

On the other hand, in the buffer base of the present invention, a support plate is further installed on each of the stacked surfaces of the buffer member, which is stacked and disposed, so that the buffer member disposed on the upper side and the buffer member disposed on the lower side are repeatedly buffered. Vibration control is possible, and vibration can be absorbed within a fine range, and there is an effect of actively improving the durability of the shock absorbing base.

1 is a perspective view of a shock absorbing base of a seismic switchboard having a double spring having a tension adjustment function constructed according to a preferred embodiment of the present invention.
Figure 2 is a perspective view of a buffer base constructed according to a preferred embodiment of the present invention.
Figure 3 is an exploded perspective view of Figure 2;
Figure 4 is an exploded perspective view of the stand.
Figure 5 is a cross-sectional view of the buffer unit.
6 to 7 is a use state of Figure 2;

Hereinafter, with reference to the accompanying drawings, the configuration of the present invention and the effects and effects thereof will be collectively described.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the person having the scope of the invention, and the present invention is only defined by the scope of the claims. And throughout the specification, the same reference numerals refer to the same components.

The present invention relates to a shock absorbing base of a seismic switchboard having a double spring with a tension control function that can prevent a safety accident in advance by suppressing the shaking of the switchboard by suppressing the shaking of the switchboard when the crust changes due to earthquake or the like.

First of all, it is equipped with a shock absorbing unit that is installed to enable vertical rotation as well as vertical movement between the ground and the switchboard, and a plurality of elastic members that endure distortion due to the vibration of the ground, which makes vibration generated at various angles in the ground more effective. Note that it is related to the shock absorbing base of the seismic switchboard with a double spring with a tension control function that can be blocked.

1 is a perspective view of a seismic switchboard having a double spring having a tension adjustment function configured by a preferred embodiment of the present invention.

As shown in Figure 1, the shock absorbing base of the present invention is installed at least one at each corner of the bottom of the switchboard to buffer each of the vibrations entering the ground for each corner of the switchboard or to produce a size corresponding to the bottom area of the switchboard. It is possible to induce the buffering of the seismic switchboard with the buffer base of.

2 is a perspective view of a buffer base constructed according to a preferred embodiment of the present invention.

As shown in Figure 2, the buffer base (1) of the present invention is installed in close contact with the ground, the lower plate (10) to induce to arrange the switchboard basically, and; It is composed of; and a plurality of standing table (30) interposed in the space between the lower plate and the upper plate to induce the upper plate to separate the upper plate from the lower plate. And although not shown in FIG. 2, the buffer unit 40 is installed in the center region of the lower plate and the upper plate to maintain the first position at all times while controlling the movement of the lower plate and the upper plate due to vibration; and, spirally installed on the outer periphery of the buffer unit It is composed of; a buffer member 50 to impart a substantial buffering effect to the buffer structure.

Figure 3 is an exploded perspective view showing the coupling relationship of the buffer base constructed by a preferred embodiment of the present invention.

As shown in FIG. 3, the lower plate 10 of the buffer base 1 is firmly fixed to the ground by using an anchor bolt along each circumference, and the upper plate 20 is disposed at a predetermined height spaced apart from the lower plate. . Then, in accordance with the counterbore provided at each corner of the lower plate and the upper plate, all the placing stands 30 are arranged in the separation space between the lower plate and the upper plate, and bolts are inserted into each counterbore of the lower plate and the upper plate to firmly fix the standing table. .

In addition, in the center region of the lower plate 10, the housing 41 is arranged in accordance with another counter bore formed to face upward from the bottom, and then fastened with a bolt, and the upper plate 10 is the same vertical as the counter bore with the housing. The rotating body 42 is coupled to a tap hole formed on the line. On the other hand, the upper rotating body 42 is provided with a bolt portion 42a having a screw thread at one end to be coupled to a tap hole of the top plate 10, and the other end of the head portion made of a circular spherical shape (sphere) It consists of 42d), the assembly is made with the head of the rotating body inserted into the inner space of the housing 41 installed on the lower plate.

For example, it will be understood that the buffer member 50 must be disposed first before the housing 41 and the rotating body 42 are connected to each other between the lower plate 10 and the upper plate 20.

The upper buffer member 50 uses a spring 51 formed by bending a wire in a spiral, and is made of various shapes and thicknesses, such as round or square, to provide elastic strength of various strengths according to the installation environment of the buffer structure. Can be used.

On the other hand, the spring 51 of the present invention is characterized by using a conical spring whose diameter gradually narrows as it goes toward one end to provide stable swing and excellent elasticity of the buffer structure 1, or use one spring or A plurality of springs having a lower height than the separation heights of the lower plate 10 and the upper plate 20 are prepared and vertically stacked and installed.

In addition, the plurality of stacked springs 51 stacked up and down further arranges a support plate 52 made of a circular or polygonal shape for each contacting portion by stacking, and the springs disposed on the upper side based on the support plates disposed between the springs ( 51) and the springs disposed on the lower side were configured to be individually elastic.

Here, by configuring the elastic force of the spring 51 provided on the upper side and the spring provided on the lower side based on the support plate 52, the sequential buffering force is further exerted according to the strength of the vibration generated on the ground. .

Figure 4 is an exploded perspective view showing the configuration and the relationship between the configuration of the stand is constructed according to a preferred embodiment of the present invention.

As shown in FIG. 4, the stand 30 is made of a hard material such as steel, and the shaft portion 31 and the upper and lower ends of the shaft portion, respectively, to actively maintain the separation space between the lower plate 10 and the upper plate 20, respectively. It is composed of an elastic member 32 to be installed.

The upper shaft portion 31 has a shape of an axis composed of a body portion 31a formed of a cylinder and a fastening portion 31b extending including a screw thread to engage with an elastic member at a lower portion of the body portion.

The elastic member 32 is a body portion (32a) made of a diameter slightly extended than the shaft portion 31, and is made of a slightly expanded diameter compared to the body portion to a support portion (32b) formed to extend on the upper and lower parts of the body It is composed.

The upper elastic member 32 is formed through a tap hole in the center and is spirally coupled to the upper and lower fastening portions 31b of the shaft portion 31, respectively, and the lower plate 10 and the upper plate in a state of being coupled with the shaft portion 31. It is arranged in accordance with the counter bore provided at each corner of the (20) is firmly coupled by a bolt, a part of one end side of the tap hole is spirally coupled to the upper and lower fastening portion (31b) of the shaft portion 31, respectively, the tab A part of the other end side of the hole is arranged in accordance with a counter bore provided at each corner of the lower plate 10 and the upper plate 20 to be joined by a bolt, and the tap hole is a portion joined by the bolt and the shaft portion 31 Between the parts that are spirally coupled to the upper and lower fastening parts (31b) of the bolt or has a portion that does not spirally coupled to the upper and lower fastening parts (31b) of the shaft portion (31) .

In the stand 30 of the above configuration, the shaft 31 is made of a steel material, and thus the separation distance between the lower plate 10 and the upper plate 20 is basically maintained despite strong vibration, and the buffer unit installed in the center region of the lower plate and the upper plate ( 40) can be safely protected, and also, through the elastic member 32 provided at both ends of the shaft portion, actively absorbs the load applied to the shaft portion by vibration to extend the life of the buffer base.

Here, the upper elastic member 32 collects the loads provided from the lower plate 10 to the upper plate 20 into the body portion 32a formed between the supporting portions 32b, and promotes pressurization vertically without distortion. .

Figure 5 is a cross-sectional view showing a coupling relationship of the buffer unit configured in accordance with a preferred embodiment of the present invention.

As shown in Figure 5, the buffer unit 40 of the present invention is composed of a housing 41 connected to the central region of the lower plate 10 and a rotating body 42 installed downward in the central region of the upper plate 20.

The upper housing 41 is configured in the form of a jar provided with a space that can be moved vertically and vertically at regular intervals while the head portion 42d of the rotating body 42 is inserted therein. Further, the upper housing 41 is further formed with a tap hole at the bottom thereof, and is bolted to the counter bore formed in the center region of the lower plate 10.

The rotating body 42 has a fastening portion 42a having a thread provided to be coupled with a tap hole formed in a central region of the upper plate 20, and a polygonal fastening portion 42b extending at a lower end of the fastening portion, and It consists of a body portion 42c extending downwardly from the pregnant woman and a head portion 42d formed in a circular spherical shape at the end of the body portion.

Here, the upper tightening portion (42b) is made of a polygon to fasten the fastening portion (42a) to the tab hole of the top plate (20) to induce the gripping of the spanner, and the upper body (42c) is the depth of the inner space of the housing Consisting of a corresponding length, the rotating body 42 is configured to reach the innermost part of the inner space of the housing.

6 to 7 are state diagrams of the use of the cushioning base of the switchboard having a rubber elastic body and a double spring constructed according to a preferred embodiment of the present invention.

As shown in Figure 6, the buffer base 1 of the present invention, when a uniform load is applied to the front surface of the top plate 20, while the elastic members 32 provided on the plurality of standing stands 30 are all pressed The separation distance between the lower plate 10 and the upper plate is narrowed.

At this time, the rotating body 42 of the shock absorbing unit 40 is made to ride the inner surface of the inner space provided by the housing 41 so that the downward movement of the upper plate 20 can be performed easily.

On the other hand, the shock absorbing member 50 installed on the outer periphery of the shock absorbing unit 40 has a uniform elastic force acted by the support plate 52, and the same shrinkage occurs while the load is applied to the top plate 20, and then the load is removed. When it returns to the original shape immediately, the elastic member 32 of the top plate and the standing table 30 can be moved to the original position.

FIG. 7 shows a shape in which the shock absorbing base is twisted by a shock absorber when a load is intensively applied to one side of the top plate 20, for example, when the load is intensively applied to the left side of the top, the corresponding position Only the elastic member 32 of the stand 30 interposed in the bark is pressed so that the upper plate has an inclination angle to the left.

At this time, the rotating body 42 installed on the bottom surface of the top plate 20 is rotated to the left on the inner space of the housing 41, the inner space of the housing by the head portion 42d formed in a circular spherical shape The correct rotation is induced in the phase.

5 and 8, the upper shock absorbing unit 40 is provided with a bolt portion 42a at the upper end of the rotating body 42, the upper bolt portion penetrates the upper plate 20 and is fastened by a nut, and the nut As the separation distance between the lower plate 10 and the upper plate is adjusted according to the tightening of the tension of the buffer member 50 is controlled .

In addition, as shown in FIGS. 4 and 8, the upper stand 30 is spirally coupled to a portion of one end side of the tab hole of the elastic member 32 with the upper and lower fastening portions 31b of the shaft portion 31 having threads. , The bolt inserted into the counter bore of the top plate 20 penetrates the top plate 20 and is coupled to a part of the other end side of the tab hole of the elastic member 32, and is fastened by a nut. 10) As the separation distance between the top plate and the top plate is controlled, the tension of the buffer member 50 is controlled .

According to the shock absorbing base of the seismic switchboard having the double spring having the tension adjustment function of the present invention configured as described above, fine vibration is caused by elastic members provided at both ends of the plurality of standing stands and the standing stands interposed between the lower and upper plates. It can be absorbed effectively, and the standing stand interposed between the lower plate and the upper plate is made of a simple coupling structure such as bolt fastening, so that it can be quickly and easily replaced when the elastic member wears out for easy installation and management.

In addition, in the center area of the lower plate and the upper plate, the shock absorbing unit installed to enable free rotation in multiple directions and up and down slide movement can quickly and freely distort and return between the switchboard and the buffer structure to actively respond to vibrations that can occur at various angles. In addition, the height of the housing and the rotating body of the shock absorbing unit can be adjusted from the lower plate and the upper plate to control the elastic force between the lower plate and the upper plate to a fine level. In addition, by stacking at least one or more buffer members in the outer circumferential region of the buffer unit to strengthen the buffering force of the buffer base, the buffer base, which is deformed by vibration, can quickly return to its original shape. Support plates are additionally installed on each of the stacked surfaces of the cushioning members, which are stacked and arranged, so that it is possible to repeatedly control the vibrations as individual cushioning of the cushioning members disposed on the upper side and the cushioning members disposed on the lower side is possible. Absorbing within the range, as well as the durability of the buffer base can be actively improved.

The present invention described above has been described with reference to one embodiment shown in the drawings, but this is only an example, and various modifications and equivalent other embodiments are possible from those skilled in the art. Should be clarified. Therefore, the true technical protection scope of the present invention should be interpreted by the appended claims, and all technical spirits within the equivalent scope should be interpreted as being included in the scope of the present invention.

10. Bottom 20. Top
30. Entrance stand 31. Shaft part
32. Elastic member 40. Buffer unit
41. Housing 42. Rotating body
50. Buffer member 51. Spring
52. Support Plate
1. Buffer base

Claims (7)

In the buffer base installed at the bottom of the switchboard,
A lower plate 10 fixedly installed on the ground;
An upper plate 20 that accommodates the switchboard in a state spaced apart from the lower plate 10 by a predetermined height;
An erecting table 30 made of at least one spaced apart space between the lower plate 10 and the upper plate 20, in the form of an axis with elastic members 32 coupled to both ends;
A buffer unit 40 consisting of a housing 41 installed in the center region of the lower plate, and a pivoting body 42 installed downward from the upper plate to enable vertical slide and free rotation on the inner space of the housing;
A buffer member 50 that is installed in a spiral from the upper surface of the lower plate 10 to the bottom surface of the upper plate 20 via the outer periphery of the buffer unit 40;
Consisting of ,
The standing table 30 is made of steel, and is composed of a shaft portion 31 that actively maintains a space between the lower plate 10 and the upper plate 20, and elastic members 32 respectively installed at both upper and lower ends of the shaft portion,
The upper shaft portion 31 has a shape of an axis composed of a body portion 31a formed of a cylinder, and a fastening portion 31b formed to include a screw thread to be coupled with an elastic member at a lower portion of the body portion,
The upper elastic member 32 is composed of a body portion 32a having a diameter extended from the shaft portion 31, and a support portion 32b formed of an extended diameter compared to the body portion and formed to extend above and below the body portion. ,
The upper elastic member 32 is formed through a tap hole in the center and is spirally coupled to the upper and lower fastening portions 31b of the shaft portion 31, respectively, and the lower plate 10 and the upper plate in a state of being coupled with the shaft portion 31. It is arranged in accordance with the counter bore provided at each corner of the (20) and coupled by bolts, a part of one end side of the tap hole is spirally coupled to the upper and lower fastening portions 31b of the shaft portion 31, respectively. A portion of the other end side is arranged in accordance with a counter bore provided at each corner of the lower plate 10 and the upper plate 20 to be joined by a bolt, and the tap hole is a portion of the shaft portion 31 and the portion joined by the bolt. Between the portion that is spirally coupled to the upper and lower fastening portion (31b) has a portion that is not coupled to the bolt or the upper and lower fastening portion (31b) of the shaft portion 31,
The elastic member 32 of the upper stand 30 is a shock-absorbing switchboard base having a double spring with a tension control function, characterized in that the rubber or silicone material .
delete According to claim 1,
The shock absorbing member 50 is a shock absorbing base of a seismic switchboard having a double spring with tension control, characterized in that a plurality of springs 51 are stacked up and down.
According to claim 3,
The upper spring (51) is a shock absorbing base of a seismic switchboard with a double spring with tension control, characterized in that the diameter of one end gradually becomes conical.
According to claim 3,
The shock absorbing member 50 is a shock absorbing base of a seismic switchboard having a double spring with tension control, characterized in that the support plate 52 that induces tension between the springs 51 is further configured.
According to claim 1,
The upper buffer unit 40 is provided with a bolt portion 42a at the top of the rotating body 42, the upper bolt portion penetrates the upper plate 20 and is fastened by a nut, and according to the tightening of the nut, the lower plate 10 and Shock-absorbing base of the seismic switchboard with a double spring with tension adjustment, characterized in that the tension of the buffer member 50 is controlled while the separation distance of the top plate is adjusted.
According to claim 1,
In the upper stand 30, the upper and lower fastening portions 31b of the shaft portion 31 are threaded and coupled to a portion of one end side of the tab hole of the elastic member 32, and inserted into the counter bore of the upper plate 20. The bolt penetrates the upper plate 20 and is coupled to a part of the other end side of the tab hole of the elastic member 32 to be fastened by a nut, and the distance between the lower plate 10 and the upper plate is adjusted according to the tightening of the nut, and the buffer is absorbed. Shock-absorbing base of the seismic switchboard with a double spring with tension control, characterized in that the tension of the member (50) is controlled .

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