JPH0365004A - Drawer type circuit breaker - Google Patents

Abstract

PURPOSE:To prevent erroneous operation by rocking a lever engageable with a slide board, which is pushed by a plug being inserted through an opening in the front face of a drawer type circuit breaker and retracted, while interlocking with make/break operation of the circuit breaker. CONSTITUTION:A plug 3D is inserted through an opening (b) in the front panel 1b of a cubicle for containing a drawer type circuit breaker (not shown) and engaged with a socket 3A. Protrusion 3b of the plug 3B contacts with a Z-type slide board 5 thus retracting the slide board 5. When the plug 3B is inserted completely and the circuit breaker is brought into connected state, a stopper 10 advances to push one end of an L-type lever 6 and to rotate the lever 6 around a shaft 7, Consequently, a protrusion 6a at the other end contacts with the protrusion 3b to prevent removal of the plug 3B. When the plug 3B is not inserted, horizontal section of the slide board 5 contacts with the upper face of the lever 6 to prevent rotation of the lever 6. By such arrangement, an interlock mechanism, where erroneous function of the circuit breaker interlocked with the lever 6 is prevented, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a draw-out type circuit breaker housed in a closed switchboard.

(Prior Art) In FIG. 4, which shows a perspective view of a conventional drawer-type circuit breaker housed in a closed switchboard, a drawer trolley 1 equipped with wheels 1a on the left and right front and rear sides has main circuit contacts at the top and bottom of the rear end. A socket 3A connected to a control circuit (not shown) of the circuit breaker 2 is inserted into the rectangular opening 1b at the lower right side of the front plate 1b of the pull-out cart 1 from the rear. In front of this socket 3A, a plug 3B connected to a control circuit of a closed switchboard (not shown) is installed in a circuit breaker chamber (not shown).

Note that the plug 3B is provided with a claw 3a, and the socket 3
When the plug 3B is inserted into A, the claw 3a is inserted into the socket 3A.
It is designed to be engaged with and not come out.

By the way, for safety reasons, the standard (Japan Electrical Manufacturers Association standard JEM-1425) states that (1) When the plug 3B is not connected to the socket 3A, the drawer type circuit breaker must be disconnected. Cannot insert from position to connected position.

(2) When the draw-out type circuit breaker is in the connected position, plug 3
B must not be left out.

It is stipulated that

Therefore, there is an idea disclosed in Japanese Utility Model Application Publication No. 63-125334. This is because an arrow-shaped lock pin is provided at the rear end of the plug 3B, and when the plug 3B is inserted into the socket 3A, the lock lever that moves between the disconnection position and the insertion position provided on the drawer-type circuit breaker is released by the lock pin. It is to be locked.

(Problems to be Solved by the Invention) However, this mechanism is easy to operate, and also satisfies the above (1).
Although this is an excellent idea that satisfies the condition (2), if the operator presses the drawer-type circuit breaker in the disconnection position without fully inserting the plug 3B into the socket (3A), the drawer-type circuit breaker There is a risk that the device may move to the connected position.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a drawer-type circuit breaker equipped with an interlock mechanism that is free from the risk of erroneous operation by the operator.

[Structure of the Invention (Means and Effects for Solving the Problems) The present invention is housed in a circuit breaker chamber of a closed switchboard, and the main circuit terminals are connected and disconnected by insertion and removal from the disconnection position of the circuit breaker chamber to the connection position. In a drawer-type circuit breaker, which has a removable male and female connector for the operating circuit in the front opening, the male connector inserted into the female connector is inserted into the opening of the drawer-type circuit breaker. One side engages with this slide plate and the other side engages with the stopper of the drawer-type circuit breaker chamber, and when the drawer-type circuit breaker is inserted from the disconnection position to the connection position, it slides with the stopper. By providing a lever that, when disengaged from the plate, swings the front end of one side toward the front of the male connector to prevent the male connector from being pulled out, an interlock mechanism is created that eliminates the risk of operator error. It is a drawer-type circuit breaker equipped with

(Example) Hereinafter, one example of the drawer type circuit breaker of the present invention will be described with reference to the drawings. However, parts that overlap with Figure 4 are omitted.

FIG. 1 is a partially cutaway perspective view showing essential parts of a drawer-type circuit breaker of the present invention, and FIG. 2 is a right side view of FIG. 1.

In FIGS. 1 and 2, on the back side of the opening 1b of the front plate 1b of the drawer-type circuit breaker (not shown), there is a guide cover 4 made of a mild steel plate that is approximately convex when viewed from above and is shown from the front side of the front plate 1b. It is not fixed with machine screws. Rectangular guide holes 4a that are long in the front-rear direction are provided on both sides of the guide cover 4.
A substantially convex-shaped hole 4b that is long from side to side is provided at the rear part, and a socket 3A is attached to the upper half of this hole 4b. On the other hand, in the lower half of this hole 4b, a slide plate 5 having a two-character shape when viewed from the side is inserted from the front, and a rectangular hole 5a with long left and right sides is provided in the vertical part of the front end of this slide plate 5, and the left and right outside is provided with a convex portion 5b which is inserted into the guide hole 4a, and a convex portion 5C is also provided in the central horizontal portion, and this convex portion 5C is also provided in the front and back under the guide hole 4a of the guide cover 4. It is loosely inserted into a guide hole (not shown) so as to be movable in the front and rear directions.

On the other hand, at the rear of the lower end of the side surface of the guide cover 4, there is a U
Both ends of a shaft 7 pass through the corner of the lever 6, which has an inverted shape when viewed from the side, and a pin 6a is provided inside the front end of the lever 6. In the drawer-type circuit breaker shown in FIG. 2, in which a tension spring 8 with a small wire diameter and a large number of turns is attached between the ends and the plug 3B is not inserted into the socket 3A in the disconnection position, the slide plate 5
is pulled by this tension spring 8, and the convex portion 5b is pulled into the guide hole 4.
The lower end of the lever 6 protrudes downward from the hole 1b2 at the bottom of the drawer-type circuit breaker.

Next, the operation of the draw-out type circuit breaker having such a configuration will be explained.

First, if you try to move the drawer type circuit breaker from the disconnection position shown in Figure 2 to the connection position at the rear right, the upper surface of the lever 6 will hit the lower surface of the horizontal part of the slide plate 5 and it will not turn, so the lower rear surface of the circuit breaker will not turn. It does not move as it hits the stopper lO provided on the room floor. That is, when the plug 3B is not connected to the socket 3A, the drawer type circuit breaker is not inserted.

Next, when the plug 3B is inserted into the socket 3A, when the tip of the plug 3B reaches the front end position of the socket 3A,
First, the convex portions 3b provided on the left and right sides of the plug 3B come into contact with the left and right front surfaces of the slide plate 5.

When the plug 3B is further pushed in, the slide plate 5 retreats, and when it is completely inserted, the slide plate 5 is pushed rearward as shown by the chain line in FIG. At the same time, the fully inserted plug 3B is pushed forward by the tension spring 8 via the front surface of the slide plate 5 and the convex portion 3b, which further improves the locking effect of the claw 3a with the socket 3A and prevents vibrations. I can't get through it either.

Next, when the drawer-type circuit breaker is inserted toward the connected position, the lower end of the lever 6 hits the stopper 10 and rotates clockwise by a predetermined angle, as shown in FIG. Then, the pin 6a at the front end of the lever 6 also swings to the front of the convex portion 3b, and the plug 3B
cannot be pulled out. That is, when the drawer type circuit breaker is in the connected position, the plug 3B does not come out.

Note that during the above operation, if the plug 3B is not fully inserted, the claw 3a will not engage with the socket 3A.
The operator is aware of this because the tension spring 8 pushes the plug 3B to remove it, and when the plug 3B comes out, the slide plate 5 is also pushed forward, so the lever 6 does not rotate and the plug is in the drawer shape. It can also be known that the circuit breaker cannot be moved to the connected position.

Further, in the above embodiment, the convex portion 3b of the plug 3B, which is prevented from being pulled out by the pin 6a of the lever 6, may be a screw-fixing flange portion provided on both sides of the front end of an ordinary plug.

Further, in the above embodiment, the forward movement of the convex portion 3b is prevented by the pin 6a, but it may be done by bending the front end of the lever 6 inward, and the pin 6a may be omitted.

[Effects of the Invention] As described above, according to the present invention, the main circuit terminals are connected and disconnected by being stored in the circuit breaker chamber of the closed switchboard and being inserted and removed from the disconnection position of the circuit breaker chamber to the connection position, and the main circuit terminals are connected and disconnected through the front opening. In a drawer-type circuit breaker equipped with removable male and female connectors for the operation circuit, a slide plate that is pushed and retreated by the male connector inserted into the female connector in the opening of the drawer-type circuit breaker; , one side engages with this slide plate and the other side engages with the stopper of the drawer type circuit breaker chamber,
When the drawer-type circuit breaker is inserted from the disconnection position to the connection position, the engagement between the slide plate and the stopper is released, and the front end of one side swings in front of the male connector, so there is no possibility of erroneous operation by the operator. Therefore, it is possible to obtain a draw-out type circuit breaker equipped with an interlock mechanism that is free from the risk of

[Brief explanation of drawings]

Fig. 1 is a perspective view of essential parts showing one embodiment of the drawer type circuit breaker of the present invention, Fig. 2 is a right side view of Fig. 1, and Fig. 3 is a portion showing the operation of the drawer type circuit breaker of the present invention. The side view and FIG. 4 are perspective views showing a conventional drawer-type circuit breaker. 6... Lever 10... Stopper

Claims (1)

[Claims] It is stored in the circuit breaker room of the closed switchboard, and the main circuit terminals are connected and disconnected when the circuit breaker room is inserted and removed from the disconnection position to the connection position, and the front opening is provided with male and female connectors for insertion and removal of the operating circuit. In the drawer-type circuit breaker, a slide plate is provided in the opening and is pushed back by the male connector inserted into the female connector, and one side engages with the slide plate and the other side engages with the slide plate. is engaged with a stopper in the circuit breaker chamber, and when the circuit breaker is inserted from the disconnection position to the connection position, the engagement with the stopper is released, and the front end of the one side is brought into contact with the front surface of the male connector. 1. A drawer-type circuit breaker, comprising a lever that swings to prevent the male connector from being pulled out.