JPH0135396Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention houses a circuit breaker (hereinafter referred to as the circuit breaker) in a case that can be mounted on a pole or an outdoor stand, and the trip mechanism of the circuit breaker is connected to the outside of the case. This invention relates to an external trip device for a circuit breaker that is more operable.

[Prior art and its problems]

Conventional devices of this type include those shown in FIGS. 1 and 2. In the figure, 1 is a circuit breaker, 2 is a case that houses this circuit breaker 1, and 3 is a case that houses this circuit breaker 1.
is attached with screws 4 or the like so that the lower cover covers the lower opening of the case. A conductor 6 on the power supply side and the load side is drawn into the case 2 through the bushing 5, and the conductor 6 is connected to the terminals 1a and 1b on the power supply side and the load side of the circuit breaker 1 inside the case 2 by screws 7 or the like. ing. Reference numeral 8 denotes a cylindrical base that is fixed through the lower cover 3 and has a hollow hole 8a, into which an external trip button 9 is slidably fitted and protrudes outward, that is, downward in the figure. . On the other hand, a base frame 10 is attached to the circuit breaker 1, a guide frame 11 is further attached to the base frame 10, and a trip rod 12 is attached by passing through guide holes 10a and 11a provided in the base frame 10 and guide frame 11, respectively. Trip rod 12
A ring 13 is provided between the ring 13 and the base frame 10.
A repulsion spring 14 is fitted between. The upper end of the trip rod 12 engages with a trip mechanism (not shown) within the circuit breaker, and its upper end resiliently abuts against the upper end of the external trip button 9 under the biasing force of a repulsion spring 14. This part is called the trip interlocking mechanism. In this case, there was a risk that the external operating force would be applied directly to the internal trip interlocking mechanism, causing it to be destroyed by excessive operating force.

[Purpose of invention]

The present invention eliminates these conventional drawbacks and presses the internal trip button via a buffer spring during external operation, thereby preventing external operating force from directly applying to the internal trip button and preventing damage to the internal trip button. The purpose is to

[Structure of the idea]

This invention is based on a lower cover 3 that covers the lower opening of the case 2.
a cylindrical base 8 which is fixed to the cylindrical base 8 and has a partition wall at its upper end; an external trip button 9 slidably fitted into the cylindrical base 8 in an outer hollow chamber of the cylindrical base 8;
A repulsion spring 14 inserted between the external trip button head 9a and the partition wall passing through the hole 8b provided in the upper end base partition wall, a buffer spring 15 installed at the top end of the external trip button operating rod 9b, and a circuit breaker. 1 The base frame 10 fixed to the case body is used as a guide, the upper part engages with the internal trip mechanism of the circuit breaker 1, and the lower part is slidably provided facing each of the buffer springs 15 with a slight clearance. It is characterized by being equipped with a trip rod 12.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. FIG. 3 is a longitudinal sectional view showing one embodiment of the present invention, FIG. 4 is an enlarged view of the main part, and FIG. 5 is an enlarged view of the main part showing the state in which the external trip button is operated. The same or equivalent parts as in FIG. 2 are designated by the same numbers. Small diameter hole 8 towards the inside of the case
The external trip button 9 has a cylindrical base 8 formed with a bottom portion 8c having a diameter of 1.5 mm, and a head 9a that slides within the hollow hole 8a and a small diameter operating rod 9 that slides within the small diameter hole 8b.
b, and a repulsion spring 14 is fitted between the head 9a and the base bottom 8c. Working rod 9b is hole 8b
, and a U-shaped buffer spring 15 is attached to its tip 8d.
This leaf spring acts as a stopper to prevent the external trip button 9 from slipping out, and together with the force of the repulsion spring 14, the external trip button 9 is fixed at a fixed position. On the other hand, the circuit breaker 1 has a base frame 10
A guide frame 11 is further attached to the base frame 10, and a trip rod 12 is attached by passing through a guide hole 11a provided in the guide frame 11. A ring 13 is provided in the middle of the trip rod 12 to prevent the trip frame 12 from falling off. The upper end of the torip rod 12 engages with a torip mechanism (not shown) in the circuit breaker, and the lower end of the torip rod 12 engages with a gap in the buffer spring 15 fixed to the upper end 8d of the external torip button.
They are facing each other with G ₁ .

As shown in FIG. 4, for example, the gap G ₁ is 1
This is to absorb assembly variations such as variations in parts and deformation of the cover when covering the lower opening of the case 2 with the lower cover 3.Depending on the variation, if the gap is
Even if G ₁ becomes zero, there is no problem in terms of performance.
The relationship between the operating strokes of the external trip button 9 and the trip button of the circuit breaker (not shown) is, for example, when the stroke L ₁ of the external trip button 9 = 11 mm and the stroke L ₂ of the trip button of the circuit breaker 1 = 5 mm. The relationship L ₁ :L ₂ =(1.5 to 2):1 is set so that even if there is some variation in assembly, the external trip operation will not become impossible.

Next, the operation of the device configured as described above will be explained. When tripping the circuit breaker 1 while it is mounted on a pole or an outdoor stand, pressing the external trip button 9 with the tip of the operating rod raises the buffer spring 15 and the trip rod 12, causing the circuit breaker 1 to rise. the trip button. In this case, an external operating force greater than the operating load of the trip button of the circuit breaker 1 is applied to operate the trip button of the circuit breaker 1 with the buffer spring 15 being slightly bent. Circuit breaker 1
After the trip button is operated, the buffer spring 15 deforms and absorbs any further external operating force, and the circuit breaker 1
No extra load is applied to the trip button of circuit breaker 1.
This prevents the trip button from being damaged.

In the above-described embodiment, the buffer spring 15 is provided above the external trip button 9, but the same operation can be obtained even if a coiled buffer spring 15 is provided in place of the buffer spring 15 as shown in FIG.

Furthermore, in the above embodiment, the operation surface of the head 9a of the external trip button protrudes from the lower end surface 8e of the cylindrical base, but as shown in FIG. 7, the operation surface of the head 9a of the external trip button It can also be mounted with a retraction dimension G ₂ from the lower end surface 8e of the cylindrical base.

When operating this configuration, the inner diameter of the lower end of the cylindrical base 8 attached to the lower cover 3 is sloped to widen the lower part, and the operating surface of the head 9a of the external trip button is retracted from the lower end surface 8e of the cylindrical base. By providing this, the tip of the operation rod fits into the lower cylindrical part of the cylindrical base 8 and is guided, making it easy to trip the circuit breaker from the ground using the operation rod, etc., even when it is mounted on a pole or an outdoor frame. In addition to being reliable, the head of the external trip button is not exposed, so there is no chance of it touching something and accidentally operating it.

[Effect of idea]

As described above, according to the present invention, since the internal trip button is pushed through the buffer spring during external operation, external operating force is not directly applied to the internal trip button, thereby preventing damage to the internal trip button. In addition, when the head operation surface of the external trip button is retracted from the lower end surface of the cylindrical base, the tip of the operation rod fits into the lower cylindrical part of the cylindrical base and is guided. Even when mounted on a top or outdoor mount, tripping the circuit breaker using an operating rod etc. from the ground is easy and reliable, and the head of the external trip button is not exposed, so there is no risk of incorrect operation if something touches it. It has the effect of not having to do anything.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a conventional structure, Fig. 2 is an enlarged view of its main parts, Fig. 3 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 4 is an enlarged view of its main parts, and Fig. 5 The figure is an enlarged view of the main part showing the state in which the external trip button is operated.
FIGS. 6 and 7 are enlarged views of main parts of other embodiments of the present invention. 1: Circuit breaker, 2: Case, 3: Bottom cover,
8: Cylindrical base, 9: External trip button, 12: Trip rod, 14: Repulsion spring, 15: Buffer spring.

Claims (1)

[Scope of utility model registration request] A cylindrical base 8 that is fixed to the lower cover 3 covering the lower opening of the case 2 and has a partition wall at its upper end; The trip button 9, the repulsion spring 14 inserted between the partition wall passing through the hole 8b provided in the base partition wall at the upper end of the cylindrical base seat 8 and the external trip button head 9a, and the upper part of the external trip button operating rod 9b. The buffer spring 15 attached to the tip and the base frame 10 fixed to the case body of the circuit breaker 1 are used as guides, the upper part engages with the internal trip mechanism of the circuit breaker 1, and the lower part engages with the buffer spring 1.
5. An external trip device for a circuit breaker, characterized in that it is provided with a trip rod 12 slidably provided opposite to each other with a slight clearance between the trip rods 12 and 5.