JPH0221530A - Circuit breaker - Google Patents

Abstract

PURPOSE:To set the position of a release type trapping device and the positioning between the device and the linking members easily by pushing in an actuator simultaneously to the gearing of a manual operation handle, and absorbing the overtravel of the manual operation handle after a resetting is over by a torsion spring. CONSTITUTION:By resetting a manual operation handle 2 from the tripping condition, one end 2a of the manual operation handle 2 is geared with a reset front plate 10a, and at the same time, a reset member 10 is then rotated counterclockwise as it is by the manual operation handle 2, and an actuator 4a is pushed in against a spring by a reset rear plate 10b. And the pushing-in of the manual operation handle 2 after the resetting is over is absorbed by bending a double torsion spring 10c and rotating the reset front plate 10a counterclockwise, and the overtravel of the manual operation handle 2 is allowed to the maximum resetting position. Consequently, the position setting of the release type tripping device 4 and the position setting between the device 4 and the linking members can be carried out easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit breaker, and particularly to a reset mechanism for a release type electromagnetic bow removal device thereof.

[Prior Art] FIG. 6 is a partially exploded side view showing a conventional circuit breaker disclosed in, for example, US Pat. No. 4,295,025. In the figure, (1) is the circuit breaker case, (2) is a manual operation handle rotatably supported on the circuit breaker case (1) with a bottle (3) as a fulcrum, and (4) is an open type electromagnetic exception device. When the actuator (4a) is released, the spring (4b)
It has become more prominent. (5) is a reset plate whose middle part is rotatably supported, and a plate spring (6) is attached to one end.
) and the other end engages with the actuator (4a).

In the OFF state of the circuit breaker shown in FIG. 6, one end (2a) of the manual operation handle (2) contacts the leaf spring (6) and the other end of the reset plate (5) contacts the actuator (4a). The leaf spring (6) and reset plate (5) are held in position, and the actuator (4a) is attracted.

Although not shown, an overcurrent flows through the circuit breaker and the actuator (4a) of the electromagnetic disconnection device (4) is released, causing the spring (
When protruded by 4b), the protrusion of this actuator (4a) trips the circuit breaker.

Then, in the trip state, the manual operation handle (2)
When you reset (rotate in the direction of arrow (7)),
One end (2a) of the manual operation handle (2) is a leaf spring (6)
When the spring (4b) is strong, the leaf spring (6) is bent and absorbs the downward force of the manual operation handle (2), and when the spring (4b) is weak, the leaf spring (6) and the reset plate (
5) rotate together to push the actuator (4a) against the reset plate (5) and spring (4b),
Then, before the manual operation handle (2) reaches the maximum reset position (the position indicated by the dotted line (8)), the actuator (4a)
) to reset the actuator (4a) of the release type magnetic trip device (4) in the conventional circuit breaker as described above. There are the following problems when using .

The spring characteristics of the leaf spring (6) are as shown in Figure 7 (a), and although not shown in the on and trip states, one end (2a) of the manual operation handle (2) does not touch the leaf spring (6). During the reset operation, the leaf spring (6) starts with a load (0), and one end (2a) of the manual operation handle (2)
), the deflection that the load gradually increases becomes large and becomes a force (the force necessary for resetting) that overcomes the spring (4b) and pushes the actuator (4a) (this is called the load (
a), the reset plate (5) begins to rotate together with the leaf spring (6) and begins to push the actuator (4a). If the reset of the actuator (4a) is not completed by the time the manual operation handle (2) reaches the maximum reset position (this is indicated by the load (b)), the position (b) is the position of the spring allowable stress. There is also a leaf spring (6
) becomes deformed and broken.

However, since the spring characteristics of the leaf spring (6) are gentle as shown in FIG. 7(a), the deflection width (δ1) corresponding to (a)-(b) is small. Therefore, the release type magnetic tripping device (4) and the leaf spring (6) are used so that the actuator (4a) is reset within this small deflection width (δI).
), it was difficult and time-consuming to set the positions of both.

As shown in Fig. 7 (b), if a leaf spring (6a) with a small spring constant is used, the deflection width (δ2) becomes large, and the release type magnetic tripping device (4) and the leaf spring (6a) Although it becomes easier to set the position of the plate spring (6a), there is a problem that the plate spring (6a) becomes larger and the device becomes larger.

This invention was made in order to solve this problem, and the object is to obtain a circuit breaker in which the position of the release water tripping device and its connection can be easily set without increasing the size of the device. shall be.

[Means for Solving the Problems] The circuit breaker according to the present invention includes a front reset plate that engages with a manual operation handle, a rear reset plate that engages with an actuator of a release water tripping device, and these front and rear plates, respectively. The actuator is pushed in at the same time as the manual operation handle is engaged, and the overtravel of the manual operation handle after resetting is prevented by the torsion spring. It is designed to be absorbed.

[Operation] In the present invention, at the time of resetting, the resetting member is rotated in an open state at a certain angle by the torsion spring at the same time as the manual operation handle is engaged, and the actuator is pushed and reset. When the manual operation handle is pressed after the reset is completed, the torsion spring bends and the front and rear reset plates are narrowly deformed to absorb the force.

[Embodiment of the Invention] An embodiment of the invention will be described with reference to FIGS. 1 to 5. Figure 1 is a side view of the main part showing the off state, Figure 2 is a view of Figure 1 seen from the left, Figure 3 is a side view of the main part showing the trip state, and Figure 4 is the maximum reset of the manual operation handle. FIG. 5 is a diagram showing the spring characteristics of the double torsion spring, and the same or equivalent parts as those of the conventional spring are given the same reference numerals and the explanation thereof will be omitted. In the figure, (9) is a reset frame fixed to the release type electromagnetic exception device (4), and (1o) is a reset member supported by the reset frame (9) by a shaft (11).
), the reset front plate (10a) is rotatably supported by the manual operating handle (2) and engages one end (2a) of the manual operation handle (2);
11) is rotatably supported by the actuator (4a).
and a reset rear plate (10b) that is inserted into the shaft (11) and that presses the reset rear plate (10b) against the actuator (4a) with one end and resets the front reset plate (10a) with the other end. Press the stopper part (9a) of the plate (10b) to reset both the front and rear plates (10a), (
10b) at a certain angle.

In the OFF state of the circuit breaker shown in FIGS. 1 and 2, the actuator (4a) is attracted, so that the reset member (10) is held at the illustrated position together with the actuator (4a). One end (2a) of the manual operation handle (2)
) is normally in a position where it contacts the reset front plate (10a), as shown by the solid line, but sometimes, as shown by the imaginary line, even if it crosses over, the reset front plate (10a) is in contact with the double torsion spring (10c). Avoid it by rotating counterclockwise around the axis (11).

In the tripped state of the circuit breaker shown in FIG. 3, the resetting member (10) is rotated clockwise around the shaft (11) by the protruding actuator (4a) and held in the position shown. .

Then, from the trip state in Figure 3, manually operate the handle (
2), when the reset member (10
) is now rotated counterclockwise by the manual operation handle (2), and this reset member (1o)
After resetting the actuator (4), the plate (10b)
a) is pushed against a spring (not shown).

When the manual operation handle (2) is in the position shown in FIG. 1 during the reset operation, the reset of the actuator (4a) is completed. Manual operation handle after reset (2)
The push is absorbed by the double torsion spring (10c) deflecting and the reset front plate (10a) rotating counterclockwise, and the manual operation handle (2) overtravels to the maximum reset position shown in Figure 4. is allowed.

A double torsion spring (
10c), both reset front and rear plates (10a), (10
b) is set at a certain angle, so the double torsion spring (10c) always (on, reset),
A load greater than load (a) is applied. Therefore, the actuator (4a) is pushed in at the same time as the manual operation handle (2) engages the reset member (10). Therefore, as shown in Figure 5, the deflection width (δ
) is large, and the actuator (4a) is activated at the same time as the manual operation handle (2) hits the reset member (10).
Since the reset of the electromagnetic device (4) and the reset member (10) are started, it becomes easier to set the positions of the electromagnetic disconnection device (4) and the reset member (10).

[Effects of the Invention] As described above, according to the present invention, there is an effect that the position of the release type exception device and its connection can be easily set without increasing the size of the device.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main part in the off state showing an embodiment of the present invention, Fig. 2 is a view of Fig. 1 seen from the left, Fig. 3 is a side view of the main part showing the trip state, and Fig. 4 is a side view of the main part in the off state. Figure 5 is a diagram showing the spring characteristics of the double torsion spring; Figure 6 is a partially cutaway side view of the conventional one; ) and (b) are diagrams showing two leaf spring characteristics. In the figure, (2) is a manual operation handle, (4) is a release type exception device, (4a) is an actuator, (10) is a reset member, (10a) is a reset front plate, (10b)
(10c) shows the torsion spring. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A circuit breaker that is equipped with a release type trip device and whose actuator is reset by being pushed in by a reset operation of a manual operation handle, including a reset front plate that engages with the manual operation handle and the actuator. and a torsion spring that always pushes these front and rear plates apart at a constant angle in the respective engagement directions, and the manual operation handle engages with the reset front plate. The reset member is rotated by the manual operation handle that is reset at the time of reset, and the after-reset plate pushes the actuator to reset it, and after the reset is completed, the manual operation handle rotates the reset member. The circuit breaker is characterized in that the torsion spring bends to absorb the energy.