JPH0438104A - Ground unit for switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a grounding device for a switch housed in a box so as to be freely drawn out.

(Prior Art) FIG. 6 shows a front view of a conventional grounding device for a drawer-type switch, and FIG. 7 shows a right side view thereof.

A substantially U-shaped fixed base 4 as shown in FIG. 6 is attached to the floor of a unit room of a closed switchboard (not shown), and a movable unit 3, which will be described in detail later, is attached to the fixed base 4 with rollers provided on the left and right sides of the lower end. 3a, the movable unit 3 is mounted so as to be able to extend forward and backward.
is fixed to a stationary base 4, and on the right side of the stationary base 4 is provided a grounding device comprising a link mechanism such as a U-shaped operating cam 31, which will be described in detail later.

Of these, a rectangular decorative board 3e is erected to cover the front surface of the movable unit 3, and U-shaped handles 3e are vertically provided on the left and right sides of the front surface of the decorative board 3e. On the other hand, an electromagnetic contactor 3b with a current limiting fuse mounted on the upper end is mounted on the rear part of the decorative board 3e, and an instrument transformer 3d is mounted on the right side of this electromagnetic contactor 3b. transformer 3
A cylindrical engagement pin 16 is provided laterally protruding from the lower part of d, and a power supply side terminal 7A is provided at the upper part of the rear surface of the electromagnetic contactor 3b.
However, the load side terminals 7B respectively protrude rearward from the lower part, and a contact part 6 incorporating a tulip-shaped contact piece (details omitted) is attached to the rear ends of these power supply side terminals 7A and load side terminals 7B. There is.

Furthermore, a guide plate 25 whose lower part is bent into a substantially trapezoidal shape is fixed in the front-rear direction slightly forward of the lower part of the engagement pin 16, as shown in FIG. 8 which is a partial detail view of FIG. 7.

Further, a power supply side terminal 8 to which a power supply side conductor of a closed switchboard (not shown) is connected to the rear end is fixed to the upper part of the rear fixed unit 4b, while a lower part of the fixed unit 4b is
A double-shaped load side terminal 29 is provided at the rear end to which a load side conductor of a closed switchboard (not shown) is connected, and the front ends of the power supply side terminal 8 and the load side terminal 29 are connected to the contact portion 6 of the movable unit in the connected state. A tulip-shaped contact piece 29a is fixed to the back surface of the rear vertical portion.

Furthermore, the lower end of the aforementioned operating cam 31 provided in the middle of the right side of the fixed base 4 is fixed to a rotatable cam shaft 13 provided laterally on the fixed base 4, and the upper end of the U-shaped groove 31a at the upper end , the engaging pin 1 of the movable unit 3 is now in the connected position.
6 are fitted, and a locking pin 13b is provided protruding from the intermediate front end toward the movable unit 3 side. On the other hand, at the rear end of the right side of the fixed base 4, a rectangular arm 12 whose lower end is fixed to an arm shaft 14 is swingably erected. Band-shaped link 1
A lower end of a grounding/disconnecting switch 10 is fixed to the arm shaft 14 inside the arm 12, and a blade 10a whose tip is opposed to the contact piece 29a is fixed to the upper end of the grounding/disconnecting switch 10.

In addition, a rectangular bracket 2 is provided in front of the operating cam 31.
4 is erected, and the front end of a band-shaped lever 25 is provided at the upper end of this bracket 24 so as to be able to swing freely back and forth around a pin 24a. A guide plate 25 is provided with a protruding guide pin 25b and is fixed to the side surface of the movable unit 3 in FIG.
The lever 25 is now in contact with the upper surface of its front end, and a recess 25a is formed in the lower surface of its rear end.

On the other hand, a flexible conductor 15 is connected between the middle part of the earthing/disconnecting switch 10 and the bottom surface of the right rear end of the fixed base 4.

Next, the operation of the switch grounding device configured as described above will be explained.

When pulling out the connected movable unit 3 forward for maintenance or inspection as shown in Figs. 7 and 8, first,
Squeeze the handle 3e and pull it forward.

Then, the power supply side terminal 7A and the load side terminal 7B become the power supply side terminal 8. on the fixed unit side. Although the load side terminal 9 is disconnected,
At the same time, the rear part of the lever 25 is lifted by the upper surface of the tip of the guide plate 23 via the guide pin 25b, and the operating cam 3
1 swings forward as shown in FIG. 10 by an engagement pin 16 at the upper end. Then, at the same time, the earthing disconnector 10 connects the link 17
．． It swings to the left via the arm 12 as shown by arrow F in FIG.

Next, when the movable unit 3 is further pulled out and the guide pin 25b reaches the upper end of the rear slope of the guide plate 23 as shown in FIG. Blade 1 of the earthing disconnector 10 at the rear end
0a is completely inserted into the contact piece 29a.

When the movable unit 3 is further pulled out, the lever 25 and the guide plate 23 are completely separated and become horizontal as shown in FIG.
1b from above and the movable unit 3 stops.

As a result, the load side (not shown) connected to this drawer type switch is completely disconnected from the power supply side and grounded, so that maintenance and inspection can be performed.

On the other hand, if the movable unit 3 is to be brought into the connected state, by inserting the movable unit 3 using the handle 3e, the lever 25 and the actuating cam 31 are connected to each other via the guide pin 25b on the upper surface of the rear end of the guide plate 23. are disengaged and connected.

(Problem to be Solved by the Invention) However, in the connection device of the switch configured in this way, when measuring the insulation resistance between the electrical equipment on the load side (not shown) and the connecting conductor to ground, The movable unit 3 housed in a closed switchboard (not shown) must be lowered from the unit room of the box, and a maintenance person must lift the lever 25 and tilt the operating cam 31 backward to disconnect the load from the ground.

This is not only troublesome, but also dangerous.

SUMMARY OF THE INVENTION An object of the present invention is to provide a grounding device for a switch that allows easy maintenance and inspection of the connected load side.

[Structure of the invention]

(Means and effects for solving the problem) The present invention is attached to a fixed part of a drawer-type switch in which a movable unit connects to and separates from a power supply side terminal and a load side terminal on a fixed side by insertion and removal into a box body, In a grounding device for a switch equipped with an earthing/disconnecting switch that connects and disconnects the load side terminal when the movable unit is inserted or removed, and grounds the load side terminal that has been disconnected from the movable unit, the , an L-shaped operating lever is provided that is unlocked and swung when the operating handle is inserted into one arm, and a link is provided between the operating lever and the earthing/disconnecting switch to connect it to the other arm of the operating lever and the earthing/disconnecting switch. This is a grounding device for a switch that is equipped with an actuating arm that is connected and whose upper front surface engages with the movable unit, thereby making it possible to release the grounding of the load that has been disconnected from the movable unit, thereby facilitating maintenance and inspection of the load.

(Embodiment) Hereinafter, one embodiment of the switch operating mechanism of the present invention will be described with reference to the drawings. However, parts that overlap with FIGS. 6 to 10 are omitted.

FIG. 1 is a front view showing a grounding device for a switch according to the present invention, and FIG. 2 is a right side view of FIG. 1.

In FIGS. 1 and 2, a decorative plate 2e is provided on the front surface of the movable unit 2, which is placed on the upper surface of the fixed base 1 so as to be freely drawn out.
is provided, and a handle 2e□ is attached horizontally to the front surface of this decorative board 2e.

In addition, the fixed base 1 is provided with an operating cam 11 whose upper end is roughly shaped on the right side of the middle part so that the upper end can swing back and forth about a camshaft 13 at the lower end. is the engagement pin 1 on the right side of the movable unit 2 in the connected state
6 is engaged.

On the other hand, on the right side of the front end of the fixing unit 1, there is shown in FIG.
As shown in Figures (a) and (b), the shaft 19 protrudes inward.
An abbreviated operating lever 18 whose upper end is swingable back and forth about an axis is provided, and a compression coil spring 18c is attached to a forearm 18b of the operating lever 18 as shown in FIG.
It is inserted as shown in a).

Further, between the front end of the coil spring 18c and the shaft 19, a T-shaped locking plate 18d shown in the figure has a guide portion 18b passing through a square hole (not shown) on the front side, and a guide portion 18b penetrating the rear end of an elliptical hole at the rear end. The lock plate 18d is provided with a shaft 19 passing through it.
The middle front upper surface of the fixing unit 1 is now in contact with the lower surface of a boss 30 that projects inside the upper part of the front end of the fixing unit 1.

Furthermore, the upper end of the upper arm 18d of the operating lever 18 and the operating cam 1
A front link 20 is connected to the intermediate portion of the 1 actuating cam 1.
A link 17 is connected between the middle part of the arm 1 and the upper end of the rear arm 12, as in the conventional case.

Furthermore, when the operating electromagnet of the electromagnetic contactor 3b is in the closed state, an engaging portion is provided at approximately the center of the fixed base 4, and the engaging portion engages with the tip of the lever whose tip is lowered by its swinging. The movable unit 3 cannot be extended or inserted from the pulled out position.

Next, the operation of the switch grounding device configured as described above will be explained.

Now, when pulling out the movable unit 2 in the connected state as shown in FIG. 2 forward, as shown in FIG.
Fit the forearm 18b of the operation bar 18, press it, and lower it as shown by arrow A. Then, as the upper arm 18a swings counterclockwise, the front link 20, the operating cam 11, and the arm 12 also swing counterclockwise.

The movable unit 2 is pulled as shown in Fig. 4, and the disconnector l
O swings in the direction of arrow B in FIG. 3, and the tip of the plate 10a is inserted into the contact piece 9a attached to the intermediate lower surface of the load side terminal 9 as shown in FIG.

Also, if you want to measure the grounding resistance of equipment or conductors connected to the load side terminal 9 in this state, please use the method shown in Figure 5(c).
As shown in , the handle 21 is inserted into the forearm 18b, pressed, and lifted upward to swing the operating lever 18 in the direction of arrow E. Then, contrary to when the drawer unit 2 is pulled out, the lever 12 swings clockwise via the front link 20 and the link 17, and the blade 10a of the earthing/disconnecting switch 10 is separated from the contact piece 9a. Therefore, the insulation resistance between ground and ground can be measured.

Furthermore, in a grounding device for a switch with such a configuration,
When the movable unit 2 is in the connected state, as will be described later, the earthing/disconnecting switch 10 cannot be closed, and when the earthing/disconnecting switch 10 is in the closed state, the movable unit 2 cannot be connected, so it is safe.

In other words, in FIGS. 2 and 3 showing the connected state of the movable unit 2, the front surface of the upper end of the actuating cam 11 is in contact with the rear surface of the engagement pin 16, so if a maintenance worker were to accidentally press the handle 21. Even if you insert it into the forearm 18b and try to rotate it in the direction of arrow A, it will not rotate.

Similarly, in FIG. 4, which shows the earthing/disconnecting switch 10 in the closed state, if a maintenance worker tries to insert the movable unit 2 by grasping the handle 2e, the engagement pin 16 will not engage the operating cam 1.
It cannot be inserted because it is blocked by the front surface of the upper end of 1.

As a result, a grounding device for a switch is obtained that allows maintenance and inspection of load equipment to be carried out safely and easily.

〔Effect of the invention〕

As described above, according to the present invention, the movable unit is attached to the fixed part of the drawer-type switch, which connects and disconnects the fixed side power supply side and load side terminal when inserted into and removed from the box, and when the movable unit is inserted and removed from the load side terminal. In a grounding device for a switch equipped with a grounding/disconnecting switch that connects and disconnects from the terminal to ground the load-side terminal that has been disconnected from the movable unit, an operating handle is attached to one arm on the fixed side of the front end of the switch. An operating lever that is unlocked and swings is provided, and the operating arm is connected to the other arm of the operating lever and the earthing disconnector via a link between the operating lever and the earthing disconnector, and the upper front surface thereof is engaged with the movable unit. By providing this, it is possible to release the grounding of the load separated from the movable unit.
It is possible to obtain a grounding device for a switch that allows easy maintenance and inspection of loads.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the grounding device for a switch according to the present invention, FIG. 2 is a right side view of FIG. 1, FIG. 3 is a detailed view showing the main parts of FIG. 2, and FIG. The figure is a side view showing the action of the grounding device for a switch of the present invention, and Figure 5 is a partial detail view of Figure 4, where (a) is a plan view, and (b) is a right side view. (c) is a partial detailed side view showing the action of Fig. 6 (b), Fig. 6 is a front view showing the conventional switch grounding device, Fig. 7 is a right side view of Fig. 6, and Fig. 8 is FIG. 7 is a detailed view showing the main part, and FIGS. 9 and 10 are detailed views of the main part showing the operation of a conventional switch grounding device. 1.Fixed base 8.Power side terminal 10.Earth disconnector 16..Engage pin I8.Operation lever 2..Movable unit 9..Load side terminal 11..Operating cam 17..Link 20.. Previous link 1st (8733) Agent Patent attorney Yoshiaki Inomata (1 person) 弗2 Sendai Enyutazu Otsuzu Rod (c) Houkizu Figure 1θ Figure

Claims (1)

[Scope of Claims] A movable unit is attached to the fixed part of a drawer-type switch in which a movable unit connects and disconnects from the power supply side terminal and load side terminal of the fixed part when inserted into and removed from the box body, and when the movable unit is inserted and removed from the box body, the movable unit A grounding device for a switch is provided with an earthing/disconnecting switch that connects and disconnects from a load-side terminal to ground the load-side terminal separated from the movable unit, wherein one side is attached to the fixed part at the front end of the drawer-type switch. An L-shaped operating lever is provided that is unlocked and swung when the operating handle is inserted into the arm, and the other arm of the operating lever and the earthing disconnector are connected via a link between the operating lever and the earthing disconnector. A grounding device for a switch, characterized in that an operating arm is connected to the movable unit and has an upper front surface engaged with the movable unit.