KR20160084571A - Anti-floating device for vacuum circuit breaker - Google Patents

Abstract

An anti-floating device for a vacuum circuit breaker is disclosed. According to an embodiment of the present invention, provided is the anti-floating device for a vacuum circuit breaker which includes a moving cart having a pilot pin inserted through an insertion hole provided in a fixing plate of a cradle. The anti-floating device comprises: a rotation body fixed to be able to rotate in the fixing plate in an upper part of the insertion hole, and of which one end unit is protruded toward the outside of the cradle, and the other end is protruded toward the inside of the cradle; a first support lever connected to the one end unit of the rotation body, and supporting the pilot pin when the pilot pin is inserted through the insertion hole; and a second support lever connected to the other end unit of the rotation body, and supporting the moving cart when the pilot pin is inserted through the insertion hole.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vacuum circuit breaker,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for preventing flow of a vacuum circuit breaker. More particularly, the present invention relates to an apparatus for preventing flow of a vacuum circuit breaker, which prevents flow due to an electromagnetic repulsive force during operation of the vacuum circuit breaker.

In general, a vacuum circuit breaker is a device that has a function of shutting off a fault current by a signal of a relay current when a normal current is opened or closed and a fault current is generated on the line. Such a vacuum circuit breaker is installed together with a switchboard for managing various electric devices, and is housed in a cradle fixed to the switchboard.

In recent years, as the equipment of the device industry has been increasing in size and the age of old equipment has come, the use of vacuum circuit breakers is increasing. Accordingly, it is very important to stably shut off the circuit breaker in the event of a short circuit in operation of the vacuum circuit breaker. Therefore, it is most important that the breaker main body does not move and maintain a stable posture due to the electromagnetic repulsive force generated in the event of a short circuit.

FIG. 1 is a view schematically showing a conventional vacuum circuit breaker.

As shown, a conventional vacuum circuit breaker 1 is provided with an upper terminal 2 and a lower terminal 3.

2 is a view showing a structure in which a conventional vacuum circuit breaker is fixed to a cradle.

3, the vacuum circuit breaker 1 is connected to the insertion hole 13 (see Fig. 3) of the fixing plate 11 fixed to the cradle 10 in front of the moving carriage 5 The mounted pilot pin 7 is inserted and fixed.

3 is an enlarged view of the area A in Fig.

3 (a), a driving wheel 5a is provided below the moving carriage 5 on which the vacuum circuit breaker 1 is mounted, and a pilot pin 7 is provided in front of the moving carriage 5, Respectively. An insertion hole 13 to which the pilot pin 7 is fixed is provided on the fixing plate 11 of the cradle corresponding to the pilot pin 7.

As shown in FIG. 3 (b), when the moving carriage 5 mounted with the vacuum circuit breaker 1 is moved to the fixed plate 11 of the cradle, the pilot pin 7 protruded forward of the moving carriage 5 Through the insertion hole (13) of the fixing plate (11).

However, there is a gap between the pilot pin 7 and the insertion hole 13 in consideration of smooth operation and assembly tolerance of the product.

However, when the electric current flowing along the current conduction path shown by the arrow in Fig. 2 becomes large, the electron repulsion force acting on the vacuum circuit breaker gradually increases.

If a large current such as a short-circuit current is energized, the vacuum circuit breaker flows in the R direction (see FIG. 2) due to the electromagnetic repulsive force (for example, the vacuum circuit breaker is heard or moved) A problem occurs in a stable shut-off operation.

For example, when an electromagnetic repulsion force due to a large current is generated, the bus bar of the vacuum circuit breaker is heard by a large electromagnetic force, and the impact force is transmitted to the product. Stable breaking operation may be difficult due to the flow shock generated at this time.

In this case, even if there is no abnormality in the shutoff operation of the vacuum circuit breaker, if the bus bar is heard, a flow shock is applied to the tulip contact which is in contact with the bus bar, .

Related prior art is Korean Patent Laid-Open Publication No. 10-1999-0066111, which discloses a safety device for a vacuum circuit breaker.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for preventing flow of a vacuum circuit breaker which prevents flowing due to an electromagnetic repulsive force during operation of a vacuum circuit breaker to maintain a stable breaking operation.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned here can be understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided an apparatus for preventing movement of a vacuum circuit breaker including a moving carriage having a pilot pin inserted through an insertion hole provided in a fixing plate of a cradle, A pivoting body having one end protruding toward the outside of the cradle and the other end protruding toward the inside of the cradle; A first support lever connected to one end of the pivot body to support the pilot pin when the pilot pin is inserted through the insertion hole; And a second support lever which is connected to the other end of the pivot body and supports the movement carriage when the pilot pin is inserted through the insertion hole.

The pilot pin is inserted through the insertion hole to maintain the tilting attitude of the turning body toward the first support lever by the weight difference between the first support lever and the second support lever, The pivoting body can be maintained in an inclined posture toward the first support lever by using the elastic force of the return spring provided on the body.

The first support lever is bent downward from one end of the rotation body to be contacted and supported on the upper surface of the pilot pin, and the second support lever is bent downward from the other end of the rotation body to contact the upper plate Can be supported.

The first support lever is formed to have a length greater than that of the second support lever, and a length difference between the first support lever and the second support lever is greater than a length difference between the upper side of the pilot pin and the upper plate As shown in FIG.

A first support pad is provided at a lower end of the first support lever to be in contact with an upper surface of the pilot pin. The first support pad has a cross-sectional area that is larger than that of the first support lever, The second support lever has a second support pad, which is in contact with the upper plate of the movable carriage, and the second support pad has a cross sectional area that is larger than that of the second support lever.

The first support lever is linked to the upper surface of the pilot pin by linking through one end of the pivot body and the second support lever is bent downward through the other end of the pivot body, And can be contact-supported on the upper plate.

The first supporting lever is provided with a latching groove and is connected to the pivoting body through a link shaft. The latching groove is supported by the latching protrusion formed at one end of the pivoting body, The possible setting angles can be limited.

The lower end of the first support lever is provided with a support roller which is in contact with the upper side of the pilot pin and rolls. A support pad is provided at the lower end of the second support lever to contact the upper plate of the movement support, The support pad may have a shape in which the cross-sectional area of the support pad is enlarged as compared with the second support lever.

According to the present invention, the flow of the vacuum circuit breaker due to the electromagnetic repulsion force can be prevented when an accident such as a short circuit current occurs at the operating position of the vacuum circuit breaker.

In particular, since the back surface portion (e.g., the bus bar) can be stably fixed in the operation state of the vacuum circuit breaker, the vacuum circuit breaker can be stably fixed even when an electromagnetic repulsive force is generated by a large current.

Furthermore, it is possible to prevent the tulip contactor from being burned out due to the flow of the vacuum circuit breaker, thereby reducing the risk of safety accidents.

Furthermore, since the vacuum breaker fixing structure according to the conventional method of inserting and fixing the pilot pin of the moving carriage to the fixing plate of the cradle can be applied at the same time, the vacuum breaker can be fixed.

1 is a perspective view schematically showing a conventional vacuum circuit breaker.
2 is a side view schematically showing a structure in which a conventional vacuum circuit breaker is fixed to a cradle;
3 is an enlarged view of a region A in Fig.
FIG. 4 is a perspective view schematically showing an apparatus for preventing flow of a vacuum circuit breaker according to a first embodiment of the present invention. FIG.
FIG. 5 is a side view schematically showing an apparatus for preventing flow of a vacuum circuit breaker according to a first embodiment of the present invention. FIG.
FIG. 6 is an operational state view of a vacuum circuit breaker according to a first embodiment of the present invention. FIG.
FIG. 7 is a perspective view schematically showing an apparatus for preventing flow of a vacuum circuit breaker according to a second embodiment of the present invention. FIG.
8 is a perspective view briefly showing an apparatus for preventing flow of a vacuum circuit breaker according to a third embodiment of the present invention.
FIG. 9 is an operational state view of a vacuum circuit breaker according to a third embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for preventing flow of a vacuum circuit breaker according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a perspective view briefly showing a flow prevention device for a vacuum circuit breaker according to a first embodiment of the present invention, FIG. 5 is a side view schematically showing a flow prevention device for a vacuum circuit breaker, Fig.

4, the apparatus 100 for preventing the movement of the vacuum breaker according to the first embodiment of the present invention is inserted through the insertion hole 13 (see FIG. 5) provided in the fixing plate 11 of the cradle (see FIG. 5) (See Fig. 5) including a moving carriage 5 (see Fig. 5) having a pilot pin 7 (see Fig. 5).

The apparatus for preventing flow of a vacuum breaker 100 includes a rotating body 110, a first supporting lever 120, and a second supporting lever 130.

The pivoting body 110 may be rotatably fixed to the fixing plate 11 (see Fig. 5) above the insertion hole 13 (see Fig. 5).

The side structure in which the rotation body 110 is installed through the fixing plate 11 (see FIG. 5) can be confirmed with reference to FIG. The rotation body 110 shown in the figure is formed with a rotation center through a fixing plate 11 (see FIG. 5), and is rotatably coupled in a clockwise or counterclockwise direction. For this purpose, a pivot shaft hole 111 is provided at the center of the pivot body 110.

One end of the pivoting body 110 protrudes toward the outside of the fixing plate 11 (see Fig. 5) of the cradle. On the other hand, the other end of the pivoting body 110 protrudes toward the inside of the fixing plate 11 (see Fig. 5) of the cradle.

The first support lever 120 may be connected to one end of the rotation body 110.

That is, the first support lever 120 may be provided on the outer side of the fixing plate 11 (see FIG. 5) of the cradle through one end of the rotation body 110.

5) of the moving carriage 5 (see Fig. 5) with an insertion hole 13 (see Fig. 5) provided in the fixing plate 11 (see Fig. 5) of the cradle. The pilot pin 7 (see Fig. 5) is supported in the inserted state (i.e., the operating state of the vacuum circuit breaker). More specifically, the upper surface 7b of the pilot pin (see Fig. 6 (b)) is supported from top to bottom.

 Thus, the first support lever 120 presses and supports the pilot pin 7 (see FIG. 5) even in the event of an accident such as a short-circuit current in the operation state of the vacuum circuit breaker 1 (see FIG. 5) (1, Fig. 5) from flowing.

The first support lever 120 has a downwardly bent shape (that is, bent in a downward 90 degree direction) from one end of the pivot body 110, and a first support pad 121 is provided at a lower end thereof do.

The first support pads 121 may have a cross-sectional area that is larger than a lower end of the first support lever 120. This is a shape for widening the surface area in contact with the pilot pin 7 (see Fig. 6 (b)) so as to more stably support the pilot pin 7 (see Fig. 6 (b)).

The second support lever 130 may be connected to the other end of the rotation body 110.

That is, the second support lever 120 may be provided on the inner side of the fixing plate 11 (see FIG. 5) of the cradle through the other end of the rotation body 110.

5) of the moving carriage 5 (see Fig. 5) with an insertion hole 13 (see Fig. 5) provided in the fixing plate 11 (see Fig. 5) of the cradle. (That is, the operation state of the vacuum circuit breaker). More specifically, the upper plate 6 (see Fig. 6 (b)) of the moving truck is supported from top to bottom.

Thus, the second support lever 130 presses the front side of the moving carriage 5 in the event of an accident such as a short circuit current in the operation state of the vacuum circuit breaker 1 (see Fig. 5) , See Fig. 6 (b)).

The second support lever 130 has a downwardly bent shape (that is, bent in a downward direction at 90 degrees) from one end of the rotation body 110, and a second support pad 131 is provided at a lower end of the second support lever 130 do.

The second support pads 131 may have a cross-sectional area that is larger than that of the lower end of the second support lever 130. This is a shape for widening the surface area in contact with the upper plate 6 (see Fig. 6 (b)) of the moving truck to stably support the upper plate 6 (see Fig. 6 (b) But is not limited thereto.

The length of the first support lever 120 may be greater than the length of the second support lever 120.

The length difference h between the first support lever 120 and the second support lever 130 is related to the position of the object to be supported. (See Fig. 6) of the pin and the upper plate 6 (see Fig. 6) of the moving bogie.

The length of the first support lever 120 and / or the length of the second support lever 130 may be telescopic type and may be adjustable in length and, if necessary, Can be used.

Referring to FIG. 5, the side structure of the apparatus 100 for preventing flow of the vacuum circuit breaker according to the first embodiment of the present invention having the above-described structure can be confirmed.

An insertion hole 13 is provided in the fixed plate 11 of the cradle and a pilot pin 7 is mounted in front of a moving carriage 5 which moves in the drawing-out direction of the vacuum circuit breaker 1.

The pilot pin 7 protruding from the moving carriage 5 is inserted into the insertion hole 12 provided in the fixing plate 11 of the cradle in the operating state (i.e., energized state) (13).

The rotating body 110 constituting the apparatus 100 for preventing flow of the vacuum circuit breaker according to the first embodiment of the present invention is rotatably coupled to the fixing plate 11 at the upper portion of the insertion hole 13.

The first supporting lever 120 is bent downward at one end of the rotating body 110 (that is, an end protruding toward the outside of the fixing plate 11), and the other end of the rotating body 110 (The end protruding toward the inside of the first support lever 11), the second support lever 130 is bent downward.

At this time, since the length of the first supporting lever 120 is longer than the length of the second supporting lever 130, the initial supporting position of the first supporting lever 120 is lowered As shown in FIG.

In other words, before the pilot pin 7 is inserted through the insertion hole 13, due to a weight difference between the first support lever 120 and the second support lever 130, the rotation body 110 Can be maintained in an inclined posture toward the first support lever 120 (i.e., counterclockwise in FIG. 5).

As another example, a separate return spring (not shown) may be provided in the pivot body 110 so that the pivot body 110 is tilted toward the first support lever 120 using the elastic force of the return spring To be maintained. However, the present invention is not limited with respect to the installation form and structure of the return sprinkle, and may have various embodiments.

The operation of the apparatus for preventing the flow of the vacuum circuit breaker according to the first embodiment of the present invention having such a structure will be described in more detail with reference to FIG.

6 (a) shows the operating state immediately before the vacuum circuit breaker is fixed to the fixing plate of the cradle, and FIG. 6 (b) shows the operating state after the vacuum circuit breaker is fixed to the fixing plate of the cradle.

6 (a), the pilot pin 7 of the moving carriage 5 is moved toward the insertion hole 13 of the fixing plate 11. As shown in Fig.

At this time, the lower end (or the first support pad 121) of the first support lever 120 is pushed by the tip end 7a of the pilot pin 7 passing through the insertion hole 13, The rotor 110 rotates in the clockwise direction as shown in FIG. 6 (b).

Thereafter, when the pilot pin 7 is completely fixed through the insertion hole 13, the first support pad 121 contacts and supports the upper surface 7b of the pilot pin 7, The second support pads 131 contact and support the upper plate 6 of the moving truck 5.

Accordingly, when the occurrence of an accident such as a short-circuit current in the operating state of the vacuum circuit breaker 1 results in a phenomenon that the electromagnetic repulsion force tries to flow in the R direction shown in FIG. 6B, the first supporting pad 121 The upper supporting surface 7b of the pilot pin 7 is supported and the second supporting pad 131 supports the upper plate 6 of the moving carriage 5 to reduce the flow space of the vacuum circuit breaker, Can be prevented.

If there is a problem with such a flow space reducing structure, the flow of the vacuum circuit breaker can be prevented by the binding force between the pilot pin 7 and the insertion hole 13. In this manner, the flow of the vacuum circuit breaker can be prevented in a double manner.

FIG. 7 is a perspective view briefly showing an apparatus for preventing flow of a vacuum circuit breaker according to a second embodiment of the present invention. FIG.

Referring to FIG. 7, the apparatus 200 for preventing flow of a vacuum circuit breaker according to the second embodiment of the present invention is compared with the apparatus 100 for preventing flow of a circuit breaker according to the first embodiment of the present invention It can be seen that the first support pad 221 and the second support pad 231 are extended to both sides.

The first support pads 221 and the second support pads 231 are formed in a shape different from that shown in FIG. 7 in comparison with the lower end shapes of the first support lever 220 and the second support lever 230, It is also acceptable to have the shape.

FIG. 8 is a perspective view briefly showing an apparatus for preventing flow of a vacuum circuit breaker according to a third embodiment of the present invention, and FIG. 9 is an operational state diagram illustrating an apparatus for preventing flow of a vacuum circuit breaker according to a third embodiment of the present invention.

Referring to FIG. 8, the apparatus 300 for preventing flow of a vacuum breaker according to the third embodiment of the present invention includes a rotating body 310, a first supporting lever 320, and a second supporting lever 330.

9) of the cradle and the second support lever 330 is bent downward from the other end of the pivot body 310 so as to move the movable pallets 5, 9) of the upper plate 6 (see Fig. 9).

The rotation body 310 and the second support lever 330 have the same function and operation as those of the first and second embodiments of the present invention.

However, since the first support lever 320 connected through one end of the pivot body 310 is different in construction and operation from the first and second embodiments of the present invention, it will be described in detail .

The first support lever 320 is formed of a link body that is linked so as to be rotatable within a set angle (that is, an angle of a rotatable range) through one end of the rotation body 310.

That is, the first supporting lever 320 is not integrally formed with the pivoting body 310 but is rotatably connected to the pivoting body 310 by the link shaft 311 through one end of the pivoting body 310.

As a specific example, the first support lever 320 is provided with an engagement groove 323 at the upper end thereof, and the engagement groove 323 is formed in the rotation body 310 in the horizontal direction when the first support lever 320 is rotated A locking stop 313 may be provided.

If the first supporting lever 320 rotates in the clockwise direction with respect to the link shaft 311 due to the linking relationship with the rotating body 310, the engaging groove 323 is engaged with the engaging jaw (I.e., the set angle) may be limited.

The upper end of the first support lever 320 may be rotatable only within a predetermined angle with respect to the link shaft 311 connected to the rotation body 310. [

On the other hand, a support roller 321, which is in contact with the upper surface 7b of the pilot pin 7 (see FIG. 9) and rolls and supports not the pad-shaped support member, And is rotatably coupled by an axis 322.

Referring to FIG. 9, the operation of the apparatus 300 for preventing flow of a vacuum circuit breaker according to the third embodiment of the present invention will be described.

9 (a), the pilot pin 7 of the moving truck 5 is moved toward the insertion hole of the fixed plate 11. As shown in Fig.

Before the pilot pin 7 is inserted through the insertion hole 13, due to a difference in weight between the first support lever 320 and the second support lever 330, It is possible to maintain the tilted posture toward the first support lever 320 (i.e., counterclockwise in Fig. 9 (a)).

More preferably, the rotation body 310 is provided with a return sprint (not shown) so that the rotation body 310 is tilted toward the first support lever 320 by the elastic force of the return spring You can make them have a posture.

Thus, when the pilot pin 7 is inserted into the insertion hole 13, the second supporting lever 330 does not collide with the end upward protrusion 6a of the moving truck upper plate 6, It can be lifted clockwise.

9 (b), the pilot pin 7 of the moving truck 5 is moved toward the insertion hole 13 of the fixing plate 11. As shown in FIG.

The pilot pin 7 may contact the support roller 321 of the first support lever 320 and push it to rotate the first support lever 320 in the clockwise direction.

At this time, the support roller 321 may roll and move along the tip of the pilot 7 without friction, so that the support roller 321 can be contacted and supported by the upper surface 7b of the pilot 7. As a result, the upper surface 7b of the pilot 7 is pressed upward and downward.

When the first support lever 320 is pushed by the pilot 7, the engagement groove 323 (see FIG. 8) of the first support lever 320 is engaged with the engagement protrusion (not shown) of the rotation body 310 313, see Fig. 8), and can no longer be rotated by itself.

Thereafter, when the first supporting lever 320 is continuously pushed and moved in the clockwise direction by the pilot 7, the pivoting body 310 having an integral structure with the second supporting lever 320 is rotated clockwise . As a result, the support pads 331 provided at the lower end of the second support lever 330 are prevented from moving upward by the upward movement of the movable truck upper plate 6 by avoiding the upward projections 6a (see FIG. 9A) And presses the moving truck upper plate 6 from top to bottom.

As described above, the third embodiment of the present invention can minimize the contact friction between the pilot 7 and the first support lever 320 when the pilot pin 7 is inserted through the insertion hole 13.

As a result, when the phenomenon that the vacuum breaker 1 attempts to flow in the R direction shown in FIG. 9 due to the electromagnetic repulsive force in the event of an accident such as a short circuit current in the operating state, the support roller 321 contacts the pilot pin 7, And the supporting pad 331 contacts and supports the movable top plate 6 to reduce the flow space of the vacuum circuit breaker so that the flow of the vacuum circuit breaker 1 can be prevented have.

If there is a problem with such a flow space reducing structure, the flow of the vacuum circuit breaker can be prevented by the binding force between the pilot pin 7 and the insertion hole 13. In this manner, the flow of the vacuum circuit breaker can be prevented in a double manner.

As described above, according to the structure and the function of the present invention, it is possible to prevent the flow of the vacuum circuit breaker due to the electromagnetic repulsion force in the event of an accident such as a short circuit current at the operating position of the vacuum circuit breaker.

In particular, since the back surface portion (e.g., the bus bar) can be stably fixed in the operation state of the vacuum circuit breaker, the vacuum circuit breaker can be stably fixed even when an electromagnetic repulsive force is generated by a large current.

Furthermore, it is possible to prevent the tulip contactor from being burned out due to the flow of the vacuum circuit breaker, thereby reducing the risk of causing a safety accident.

Furthermore, since the conventional fixing structure for inserting and fixing the pilot pin of the moving carriage to the fixing plate of the cradle can be applied at the same time, it is possible to double the effect of fixing the vacuum circuit breaker.

Although the vacuum interrupter of the present invention has been described above, it is obvious that various modifications are possible within the scope of the present invention.

It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are not to be construed in a limiting sense, and the scope of the present invention is indicated by the appended claims rather than by the foregoing description, All changes and modifications that come within the spirit and scope of the appended claims are intended to be embraced therein.

1: Vacuum circuit breaker 2: Upper terminal
3: Lower terminal 5: Moving truck
5a: Driving wheel 6: Moving car top plate
7: Pilot pin 7a: Pilot pin tip
7b: Pilot pin side 10: Cradle
11: Fixing plate 13: Insertion hole
100: First Embodiment of Flow Restraint Device of Vacuum Circuit Breaker
110: rotating body 111: rotating shaft ball
120: first support lever 121: first support pad
130: second support lever 131: second support pad
100: Second Embodiment of Flow Restraint Device of Vacuum Circuit Breaker
210: pivot body 211: pivot shaft
220: first support lever 221: first support pad
230: second support lever 231: second support pad
300: Third Embodiment of Flow Restraint Device of Vacuum Circuit Breaker
310: Rotating body 311: Link shaft
313: latching jaw 320: first support lever
321: Support roller 322: Roller shaft
330: second support lever 331: support pad

Claims (8)

A device for preventing movement of a vacuum circuit breaker including a moving carriage having a pilot pin inserted through an insertion hole provided in a fixing plate of a cradle,
A rotating body rotatably fixed to the fixing plate at an upper portion of the insertion hole, one end portion protruding toward the outside of the cradle and the other end protruding toward the inside of the cradle;
A first support lever connected to one end of the pivot body to support the pilot pin when the pilot pin is inserted through the insertion hole; And
And a second support lever connected to the other end of the pivot body to support the moving truck when the pilot pin is inserted through the insertion hole.
The method according to claim 1,
Before the pilot pin is inserted through the insertion hole,
The rotation body may be maintained in an inclined posture toward the first support lever by a weight difference between the first support lever and the second support lever,
Or the rotation body is held in an inclined posture toward the first support lever by using an elastic force of a return spring provided on the rotation body.
3. The method according to claim 1 or 2,
The first support lever is bent downward from one end of the pivot body to be contacted with an upper surface of the pilot pin,
Wherein the second support lever is bent downward from the other end of the rotation body and is contact-supported by the upper plate of the movement bogie.
The method of claim 3,
The first support lever
The second support lever is formed to have a longer length than the second support lever,
Wherein a difference in length between the first support lever and the second support lever is determined corresponding to a height difference between an upper surface of the pilot pin and an upper plate of the moving truck.
The method of claim 3,
The first support lever has a first support pad which is in contact with an upper surface of the pilot pin, and the first support pad has a cross-sectional area that is larger than that of the first support lever,
And a second support pad provided at a lower end of the second support lever to contact the upper plate of the movable carriage, wherein the second support pad has a shape in which a sectional area of the second support pad is larger than that of the second support lever, .
3. The method according to claim 1 or 2,
The first support lever is linked and connected to the upper surface of the pilot pin through one end of the pivot body,
And the second support lever is bent downward through the other end of the rotation body to be contacted with the upper plate of the movement truck.
The method according to claim 6,
Wherein the first support lever is provided with an engagement groove at an upper end thereof and is connected to the rotation body via a link shaft,
Wherein the latching groove is held in contact with a latching protrusion formed at one end of the pivoting body to limit a rotatable setting angle of the first supporting lever.
The method according to claim 6,
And a support roller provided at a lower end of the first support lever for rolling contact with an upper surface of the pilot pin,
Wherein the supporting pads are provided at the lower end of the second support lever in contact with the upper plate of the movable bogie, and the support pads have a shape in which a sectional area of the support pads is larger than that of the second support levers.

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