JPS6233464Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a closed switchboard, and more particularly to a position switch that operates in conjunction with equipment housed in a freely drawable manner.

(Prior Art) In FIG. 1, which shows a side view of a closed switchboard to which a conventional position switch is installed, a circuit breaker chamber in which a circuit breaker 3 is housed is located in front of a partition wall that partitions the inside of a closed switchboard 1 into front and rear sections. 1, on the rear side there is a busbar chamber 2 in which the busbar 4 is housed, and on the floor between the circuit breaker 3 and the bulkhead there is a position switch 5 whose front side touches the rear end of the circuit breaker 3 and switches internal contacts. be. 2 and 3 are detailed views of the position switch 5, with FIG. 2 showing the circuit breaker 3 in the test position and FIG. 3 showing the circuit breaker 3 in the connecting position. In FIG. 2, the position switch 5 has a convex shape when viewed from the side, and a switch 6 having an operating shaft 6a penetrating inwardly on the top of a sheet metal plate that is shaped like a rectangle when viewed from the top. The other end of a lever 7 in the shape of a strip with a hole provided at one end is fixed to the inner end, and a push plate 8 in the shape of a strip moves back and forth (left and right in Fig. 2) on the square-shaped sheet metal when viewed from the top. The intermediate part of the push plate 8 and the end part of the lever 7 are swingably connected with a pin, and the operating shaft 6a
A clockwise rotational force is applied by the spring in the switch 6, and as a result, the front end of the push plate 8 is pressed against the rear end of the circuit breaker 3, and the b contact in the switch 6 is turned ON.
are doing.

On the other hand, in FIG. 3, the front end of the push plate 8 is connected to the circuit breaker 3.
The lever 7 swings counterclockwise, the a contact of the switch 6 turns on, and a position signal (closed) of the circuit breaker 3 is sent to the operating circuit.

Here, this position switch 5 has a b contact when the circuit breaker 3 approaches the test position sufficiently.
When circuit breaker 3 is fully connected, the a contact
Required to be turned ON. The reason is that the former is for safety when measuring insulation resistance on the load side, and the latter is to avoid closing the circuit breaker 3 in a state where the connection is insufficient (a problem that the invention aims to solve). The position switch has the following problems.

That is, the rotation angle of the lever 7 with respect to the moving distance of the circuit breaker 3 is determined between the connection position and the test position (i.e. a, b
It is maximum when the contact is ON/OFF), so if
Position switch 5 due to assembly error of closed switchboard 1
If the mounting position is even slightly shifted, the rotation angle may be too large or too small, and the contacts may not make contact. Therefore, in order to avoid this, it is necessary to improve the assembly accuracy of the closed switchboard 1.

The purpose of the present invention is to provide a position switch for a closed switchboard that can reliably and accurately interlock with the circuit breaker position without increasing the accuracy of parts or assembly.

[Structure and action of the idea]

In the position switch of this invention, the switch is mounted horizontally, the upper surface of the middle rear part of the strip-shaped push plate is shaped like a step with three horizontal parts of different heights, and the other end of the lever is fixed to the end of the rotating shaft of the switch. is equipped with a pin that slides on the top surface of the stepped portion.

As a result, the rotation angle of the lever is determined by the difference between the highest and lowest points, regardless of the error in the travel distance of the circuit breaker.

(Embodiment) An embodiment of the position switch of the present invention will be described below with reference to FIGS. 4 to 6.

4 is a side view when the circuit breaker 3 is in the test position, FIG. 5 is a side view when the circuit breaker 3 is in the connection position, and FIG. 6 is a plan view of FIG. 5.

In Figures 4 to 6, a position switch 5 is installed on the floor behind the circuit breaker 3 in the closed switchboard 1 (more specifically, at the rear left when viewed from the front of the closed switchboard).
is a guide plate 12 whose inner side view is square-shaped and whose plan view is square-shaped.
A rotating shaft 11a protrudes inward from the outside of the guide plate 12, and a rotary switch 11, to which a clockwise rotational force is applied by an internal spring, is oriented horizontally (i.e., from FIG. 90 counterclockwise
The front end of a strip-shaped lever 13 is fixed to the protruding end of the rotary shaft 11a, and a pin 13a is fixed to the rear end toward the inside of the closed switchboard 1.

In addition, as shown in FIG. 6, on the front and rear surfaces of the guide plate 12, the rear end is bent into a U-shape, and a horizontal middle section 9b that is one step lower than the first inclined section is formed in the center. A push plate 12 having a lower horizontal lower step 9a following the second inclined part from 9b has a pin 13a that engages with the upper end face of the push plate 12 and penetrates the front side of the guide plate 12 and the rear end of the push plate 9. It is pressed forward by a coil spring 10 provided between the U-shaped parts.

Here, the height of the lower part 9a is b of the switch 11.
When the contact is completely turned on, the lower surface position of the pin 13a and the height of the middle part 9b are as follows:
The lower surface position of the pin 13a at the center of the contact (that is, when the lever 13 is horizontal) and the height of the upper part 9c are the pin 13a when the a contact of the switch 11 is completely turned on.
It is located at the bottom of the .

Furthermore, the length from the rear end of the upper part 9c to the front end of the lower part 9a is the distance from the connection position of the circuit breaker 3 to the test position, and the slope is approximately 45 degrees, so that the circuit breaker 3 is at the test position during assembly. At this time, the guide plate 12 is fixed to the floor surface with the pin 13a at the front end of the lower part 9a.

When the circuit breaker 3 of the closed switchboard 1 equipped with the position switch 5 configured as described above is turned on from the test position, the push plate 9 shown in FIG. 13a is quickly pushed up, the lever 13 is swung counterclockwise to turn off the B contact, and the put pin 13a is further raised to the middle part 9b, so that the movable contact of the switch 5 becomes exactly in the middle between the A and B contacts. .

Then, when the circuit breaker 3 is further turned on and the main contact of the circuit breaker 3 approaches, the pin 13a hits the lower part of the slope between the upper section 9c and the middle section 9b, and the lever 13 suddenly begins to swing. The main contact of circuit breaker 3 begins to make contact. Further, when the pin 13a comes close to the upper part 9c, the a contact of the switch 5 starts to make contact and rises to the upper part 9c, and at the same time the a contact and the main contact of the circuit breaker 3 are completely turned on.

At this time, even if the moving distance of the circuit breaker 3 is longer than the reference value, the rotation angle of the switch 5 does not change.

When removing the circuit breaker 3, the opposite is true.
The contacts are released, then the main contact is released, and when they reach the test position the B contact turns ON.

[Effect of idea]

As described above, according to the position switch of the present invention,
At the top of the push plate, which moves forward and backward in conjunction with the circuit breaker, the lever of the switch comes into contact with the top surface to rotate the switch, there are three horizontal parts with lever movement heights that correspond to the ON/OFF rotation angle of the switch, and a sloped part between them. By rotating the lever, the switch was turned on and off when the circuit breaker was connected and just before the test position when it was pulled out, so there was no need to increase the accuracy of parts or assembly.
It is possible to obtain a closed switchboard position switch that turns on and off in accordance with the circuit breaker position.

[Brief explanation of the drawing]

Figure 1 is a side cross-sectional view of a closed switchboard with a conventional position switch installed; Figure 2 is a detailed side view of the conventional position switch with the circuit breaker in the test position; Figure 3 is a detailed side view of the circuit breaker in the connected position. Figure 4 is a detailed side view of the conventional position switch when the breaker is in the test position, Figure 5 is a side view of the position switch of the present invention when the circuit breaker is in the test position, and Figure 5 is the position of the present invention when the circuit breaker is connected. A side view of the switch, FIG. 6 is a plan view of FIG. 1... Closed switchboard, 3... Circuit breaker, 5... Position switch, 9... Push plate, 9a... Lower section, 9b... Middle section, 9c... Upper section, 11...
Switch, 12...Guide plate, 13...Lever.

Claims (1)

[Claims for Utility Model Registration] A circuit breaker that is housed in a main circuit connection part in a box so that it can be freely pulled out from a connection position to a test position; A closed switchboard comprising a position switch that engages with the circuit breaker to turn on and off, includes a square-shaped support plate and a rotating shaft that passes through the support plate from the outside to the inside, and is attached to the rotating shaft. ON-OFF at both swinging ends
a lower section that extends through the support plate in the front and rear directions and has a horizontal upper end at the rear; a horizontal middle section that continues to the inclined section in front of the lower section; and a horizontal section that continues to the inclined section in front of the middle section; a push plate whose front end engages with the circuit breaker from the connection position to the test position and moves back and forth; and one end which is fixed horizontally to the inner end of the rotating shaft of the switch. , a lever whose other end slides on the upper surface of the three steps of the push plate that moves back and forth and swings together with the rotating shaft of the switch; and a spring that constantly presses the push plate forward. Closed switchboard position switch.