JPS635384Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a drawer-type circuit breaker and disconnector, and in particular, a drawer-type circuit with an improved rail support mechanism and a simplified release operation. and disconnectors.

[Conventional technology]

In general, the main parts of a drawer type circuit breaker include a circuit breaker or breaker, a side plate that protects both sides of the circuit breaker or breaker, a roller provided on this side plate, and a roller that protects both sides of the circuit breaker or breaker. It is composed of a fixed frame having a rolling first rail, and a second rail extending the first rail.

In the drawer-type circuit breakers and disconnectors constructed in this manner, the circuit breakers and breakers are always housed within the fixed frame, but may be pulled out of the fixed frame for maintenance, inspection, and the like. In this case, in order to facilitate maintenance and inspection, a configuration is adopted in which the circuit board and disconnector are pulled out after pulling out the second rail, which is housed outside the fixed frame in continuation with the first rail. It was getting worse.

This second rail is, for example,
As shown in the publication, two pins are provided that loosely fit into long holes formed in the second rail, and the second rail is supported by these two pins. Ta. In addition, after storing the second rail,
It was screwed onto the fixed frame with, for example, screws.

[Problem that the invention attempts to solve]

In conventional circuit breakers and circuit breakers having such a configuration, the length of the second rail to be pulled out is the length of the elongated hole minus the pitch length of the two pins.
Therefore, since the length of the second rail to be pulled out is shortened, there is a problem in that work such as maintenance and inspection of circuits and disconnectors is hindered.

Further, since the second rail is screwed on with screws or the like during storage, there is a problem in that the operation of releasing and tightening the second rail must be repeated every time an inspection is performed.

This invention solves the problems of the conventional ones described above, and provides a drawer-type circuit breaker that allows the second rail to be extended in length and allows the second rail to be easily released and fixed. The purpose is to

[Means for solving problems]

The drawer-type circuit breaker according to this invention can be slid by a roller provided on the breaker main body, a support part provided in the fixed frame, and a guide pin installed in the fixed frame. supported, has an elongated hole in the longitudinal direction, has a recess formed in the lower end surface, is rotatably supported by a second rail that slidably supports the roller, and a pin that loosely fits into the elongated hole; A stopper having a chevron-shaped protrusion projecting upwardly from the upper end surfaces of the first and second rails on the upper end surface and a bent portion engaging the recess on the lower end thereof, and a stopper between the stopper and the fixed frame. It is provided with a helical spring that is stretched and engages the bent portion with the recessed portion.

[Effect]

In this invention, by supporting the second rail with a support part and a pin, the second rail is pulled out until the pin abuts the end of the elongated hole. Furthermore, by pulling out the second rail, the roller slides into engagement with the chevron-shaped protrusion of the stopper, and releases the engagement between the bent part and the recessed part of the stopper against the spring force of the helical spring. .

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 is a perspective view showing an embodiment of the drawer-type circuit breaker according to the invention housed in a fixed frame. In FIG. 1, the circuit breaker 1 is
This is a device that interrupts the circuit in response to an overcurrent that exceeds the rated value. The protrusion 2 has a frame-shaped circuit and a disconnector 1.
It is provided protruding from the front of the. Operation handle 3
is provided so as to protrude outward from the hollow part of the protruding part 2, and is interlocked with the contact opening/closing mechanism. The front cover 4 has the protrusion 2 inserted through a through hole (not shown), and covers the surface of the main body of the circuit breaker 1. The dust plate 5 has the protrusion 2 inserted through its through hole (not shown).
The leaf spring 6 is installed between the front cover 4 and the dust plate 5, and elastically supports the dust plate 5. The top plate 7 is attached to the surface of the protrusion 2 and covers the hollow part thereof. A pair of side plates 8 are attached to both sides of the circuit breaker 1. As shown in detail in FIG.
It has a spool-like configuration and is rotatably supported by shafts 10 respectively attached to a pair of side plates 8. The fixed frame 11 surrounds the circuit and disconnector 1 in a U-shape, and has recesses 90 for each of the two pairs of rollers 9 in the side wall facing the pair of side plates 8, respectively.
A pair of first rails 12 are formed to be slidably engaged with the first rails 12, and the open end of the U-shaped fixed frame 11 is bent outward in an L-shape to form a pair of support parts 11B. There is. As shown in detail in FIG. 6, the pair of second rails 13 are provided in contact with the outer surfaces of the pair of side walls of the fixed frame 11, and their upper end surfaces are slidably engaged with the recesses 903 of the rollers 9. do. A pair of long holes 1
4 is bored in the longitudinal direction of each of the pair of second rails 13. The pair of recesses 15 are the sixth
As shown in the figure, it is formed by being cut into the lower end surface of each of the pair of second rails 13. The pair of first pins 16 are respectively planted on the side walls of the fixed frame 11, are loosely fitted into the respective elongated holes 14 of the pair of second rails 13, and are connected to the pair of support parts 11B of the fixed frame 11. It also guides the second rail 13 when it is pulled out from the fixed frame 11. As shown in FIG. 6, the pair of stoppers 17 have a chevron-shaped protrusion 17A formed on the upper end surface of a substantially L-shaped material, an L-shaped bent part 17B formed on the lower end, and a protrusion 17A. are the first and second rails 12, 13
It is rotatably supported by the first pin 16 so as to protrude upward from the upper end surface, and when the circuit disconnector 1 is housed in the fixed frame 11, the protrusion 17A
protrudes from the upper end surfaces of the first and second rails 12 and 13, and the bent portion 17B is the concave portion 1 of the second rail 13.
It is locked at 5. The pair of helical springs 18 are
One end of the second pin 1 is set in the fixed frame 11.
9, and the other end is fixed to a third pin 20 planted in the stopper 17.
7 in a clockwise direction around the first pin 16. The pair of guide pins 23 are connected to the second rail 13
when storing it in the fixed frame 11, the second rail 1
3.

Next, the operation of the draw-out type circuit breaker and disconnector configured as described above will be explained. FIG. 2 is a side view of FIG. 1, showing a state in which the circuit breaker 1 is housed inside the fixed frame 11 and the second rail 13 is housed outside the side wall of the fixed frame 11. That is, it shows a state in which the connecting conductor 21 at the rear of the circuit breaker 1 shown in FIG. 7 and the external connecting conductor 22 provided on the fixed frame 11 opposite to this connecting conductor 21 are connected. It is. Note that FIG. 3 is an enlarged view of the main parts of FIGS. 1 and 2. As is clear from FIG. 3, when the rollers 9 are in sliding engagement with the first rail 12, the second rail 13 is configured not to be in sliding engagement with the rollers 9.

When the circuit breaker 1 is first pulled out from this state, the roller 9 supporting the circuit breaker 1 slides on the first rail 12, and the protrusion 17A of the stopper 17 slides on the roller 9 supporting the circuit breaker 1. be in contact with When the withdrawal is continued, the stopper 17 rotates counterclockwise about the first pin 16 against the tensile force of the helical spring 18, as shown in FIGS. 4 to 6. Therefore, the bent portion 17B that is locked in the recess 15 of the second rail 13 is isolated from the recess 15.

Note that in this state, the roller 9 is
The second rail 1 is slidably engaged only with the second rail 12.
3 is configured so as not to be slidably engaged. In this way, when the recess 15 of the second rail 13 and the stopper 17 are unlocked, the second rail 13 can be freely pulled out to the left in FIGS. 4 to 6. . This drawing length allows drawing until the end of the elongated hole 14 comes into contact with the first pin 16.

Next, the circuit breaker 1 is pulled out as shown in FIG. When this circuit breaker 1 is pulled out onto the second rail 13, the circuit breaker 1 and the second rail 13 are connected to the support portion 11B of the fixed frame 11, as shown in FIG. It is supported by a first pin 16.

Next, the circuit breaker 1 and the second rail 13
To store the circuit breaker 1, first push the circuit breaker 1 to the right in FIG. Then, the roller 9 that supports the circuit and disconnector 1 moves to the second rail 13.
and the first rail 12, and the fixed frame 11
stored inside. Next, the second rail 13,
When pressed rightward in FIG. 7 to reach a predetermined position, the bent portion 17B of the stopper 17, which is always biased clockwise, is fitted into the recess 15 of the second rail 13 again. The second rail 13 is automatically locked.

[Effect of idea]

This invention is configured as described above, and after the second rail 13 is pulled out, the circuit and disconnector 1 are
Since it is supported by the support part of the fixed frame 1 and the first pin 16, the length of the drawer can be increased without making the second rail 13 longer than the conventional one. Further, the second rail 13 is connected to the helical spring 1
The second rail 13 is locked by the stopper 17 biased by the rail 8, and the lock is automatically released by the movement of the circuit breaker 1, so that the second rail 13 can be pulled out. As before, the second rail 13
There is no need to manually fix and release the second rail 13, and there is no need to forget to fix the second rail 13, making it easy to pull out and store the circuit breaker 1, improving safety. It has the effect of

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the circuit breaker and breaker according to this invention housed in a fixed frame;
The figure is a side view of FIG. 1, FIG. 3 is an enlarged view of essential parts of FIGS. 1 and 2, and FIGS. 4 to 7 are explanatory diagrams of the operation of this invention. In the figures, the same parts in each figure are denoted by the same reference numerals, 1 is the circuit breaker, 9 is the roller, 11 is the fixed frame, 11B is the support part, 12 is the first rail,
13 is a second rail, 14 is a long hole, 15 is a recess,
16 is a first pin, 17 is a stopper, 17A is a projection, 17B is a bent portion, and 18 is a helical spring.

Claims (1)

[Claims for Utility Model Registration] Circuit breakers 1 equipped with rollers 9 on both sides respectively
, a pair of first first plates are formed in a U-shape, house the circuit board and disconnector 1 so as to be pulled out to the front side, and are slidably engaged with the rollers 9 on two parallel sides of the U-shape.
a fixed frame 11 having a rail 12 and a pair of support parts 11B provided near the open ends of each of the two parallel sides; a pair of second rails 13 that are housed in the fixed frame 11 so as to be able to be pulled out in the direction of extending the first rail 11A, have a long hole 14 in the longitudinal direction, and have a recess 15 formed in the lower end surface; , the fixed frame 1 is loosely fitted into the elongated hole 14;
A pin 16 is installed on two parallel sides of the rail 1, and a pin 16 is rotatably supported by the pin 16, and has a mountain-shaped upper end surface that protrudes upward from the upper end surface of the first and second rails 12 and 13. A protrusion 17A is formed,
a pair of stoppers 17 having bent portions 17B formed at their lower ends that engage with the recessed portion 15; and a pair of stoppers 17 that are stretched between the stopper 17 and the fixed frame 11 to engage the bent portion 17B with the recessed portion 15. A drawer-type circuit breaker comprising a helical spring 18 that disengages the bent portion 17B and the recessed portion 15 when the roller 9 and the protrusion 17A engage with each other.