JPS6036054B2 - circuit break - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an opening/closing mechanism for a circuit or breaker that switches on and off current.

Conventionally, there has been a device of this type as shown in FIG.

In the figure, a fixed contact conductor 2 to which a fixed contact 4 is fixed for current flow, a movable contact conductor 5 to which a movable contact 6 is fixed, and a separation spring 21 to apply a separation force to the movable contact conductor 5. , a fulcrum 1 that assists the opening/closing operation of the movable contact conductor 5
7a and 17b, the reinforcement spring 22 which helps the closing operation by absorbing the variation in movement of the crossbar, and the positioning of the separation spring 21 and contact pressure spring 22 to maintain the bush pressure and to apply force to the movable contact conductor 5. It consists of a crossbar 7 for applying force, a handle 10 for transmitting manual force, and an IJ link 9. During the opening operation, the pushing force of the cross bar 7 from the handle 101 is weakened, the force of the separation spring 21 pushes the cross bar 7 upward, the movable contact conductor 6 is lifted, and the movable contact 5 is opened. At this time, the movable contact conductor 5 is connected to the convex portion 17 of the overcurrent detection device 17.
At point a, the movable contact 5 opens enough to cut off the current, using this as a fulcrum. On the other hand, during the closing operation, the manual force transmitted by the handle 10 and the link 9 becomes a force that pushes the crossbar 7, and this overcomes the opening force of the opening spring 21, thereby pushing the crossbar 7 down and reducing the bush pressure. The movable contact conductor 5 is pushed down via the spring 22, and the movable contact 6 comes into contact with the fixed acid contact 4 to be in a closed circuit state. At this time, the movable contact conductor 6 is connected to the convex portion 17M of the overcurrent detection device 17.
The force that pushes down the cross bar 7 by using this as a fulcrum causes the bush pressure spring 22 to bend and is stored as bush pressure. The structure described above requires two types of opening springs and pressure springs, which requires a large number of parts and is difficult to assemble.Also, the relationship between the opening spring, the bale pressure spring, and the movable contact conductor is difficult to assemble. The configuration of the crossbar becomes complicated, the mold structure becomes complicated, and deformation during molding becomes large.

In addition, a relief is required to incorporate the bush pressure spring into the crossbar, which weakens the mechanical strength. This invention was made in order to eliminate the above-mentioned drawbacks of the conventional ones, and provides a highly reliable circuit and disconnector that is easy to assemble and can facilitate the opening and closing movement of the movable contact. This is what we provide.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. In FIG. 2, there is a handle 10 that transmits the force of the handle, a link 9, a crossbar 7 that engages with the link 9 and transmits this force to the p-movement contact conductor 5, and a movable contact conductor 5.
It consists of a pushing spring 21 that generates the opening force and the bale pressure.

A second point of action that is pushed by the crossbar 7 is provided between the contact point of the contact 6 of the movable contact conductor 5 and the first point of action by the pressing 21 of the movable contact conductor 5, and only when the circuit is opened. The contact point of the convex portion 17a that contacts the movable contact conductor 5 is set in a direction opposite to the second point of action with respect to the first point of action. As shown in FIG. 5, recesses 5a, 5a are formed at both widthwise ends of the movable contact conductor 5 at the point of action of the cross bar 7 on the movable contact conductor 5. The above-mentioned cross bar 7 corresponds to the above-mentioned concave portion 5a.
A groove-shaped engaging portion 7a is formed in the recessed portion 5a.
The movable contact conductor 5 is positioned by engaging the engaging portion 7a. During the opening operation, when the downward force exerted by the handle 10 and the link 9 is removed, the movable contact conductor 5 and the crossbar 7 are pushed up by the force of the push spring 21, as shown in FIG. 17a, the movable contactor 5 is opened wide. Further, during the closing operation, the manual force applied to the handle 1 acts as a force pushing down the crossbar 7 due to the action of the link 9. This force overcomes the separating force of the push spring 21 and pushes the movable contact conductor 5 downward, causing the movable contact 6 and the fixed contact 4 to come into contact with each other, resulting in a closed circuit state, as shown in FIG. Furthermore, as the movable contact conductor 5 is slightly lowered via the crossbar 7, the movable contact conductor 5 leaves the convex portion 17a and force is stored in the push spring 21, so that the movable contact conductor 5 is moved back from the fixed contact 4. It acts as pressure. Furthermore, when the operation is caused by an overcurrent, the overcurrent detection device 17 works as shown in FIG.
The engagement of the cross bar 7 is released, and the opening force of the push spring 21 causes an open circuit state. As described above, according to the present invention, a single spring has the effects of both the separation spring and the pressure spring, and the points of action of the crossbar and the pressure spring on the movable contact conductor are not close to each other. By adopting a configuration in which the number of parts is small and the crossbar shape can be simplified, assembly is easy and mechanical strength can be improved.

In particular, recesses are formed at both ends in the width direction of the movable contact conductor located at the point of action of the crossbar, and the movable contact conductor is positioned by engaging the recesses with engaging portions formed on the crossbar. By doing so, the movable contact conductor pivots about the engagement point as a fulcrum with respect to the vertical movement of the crossbar, so that smooth opening and closing operations of the movable saddle contact conductor are achieved, resulting in a circuit with excellent operability. We can provide a power supply and disconnection device.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a conventional circuit breaker, FIG. 2 is a cross-sectional view showing a circuit breaker state according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view showing its closed state. FIG. 4 is a sectional view showing the moment when the circuit is opened due to overcurrent, and FIG. 5 is an exploded perspective view showing the engagement structure between the movable contact conductor and the crossbar. In the figure, 2 is a fixed contact conductor, 4 is a fixed twill contact, 5 is a movable contact conductor, 5a is a recess, 7 is a cross bar, 7a is an engaging part, 9 is a link, 1 is a handle, 11, 13 ,1
4 is a pin, 12 is a frame, 15 is a handle spring, 16
A ladder bar, 17 is an overcurrent detection device, 17a is a convex portion, 21
is a compression spring. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A rigid movable contact conductor through which current flows, a fixed contact conductor, a crossbar that engages with the movable contact conductor and moves up and down, and maintains contact pressure and applies a separating force to the movable contact conductor. Consists of a push spring and part of an overcurrent detection device.
In the circuit breaker and disconnector having a convex portion that engages with one end of the movable contact conductor and assists in separating the movable contact conductor, the contact of the movable contact conductor and the push spring of the movable contact conductor are connected to each other. There is a second point of action that engages with the crossbar between the first point of action and the point of contact of the convex portion that contacts the movable contact conductor only when the circuit is opened is the second point of action with respect to the first point of action. an engaging portion formed in the cross bar, which is set in a direction opposite to the point of action, is located at the point of action of the cross bar in the movable contact conductor, and has recesses formed at both widthwise ends of the movable contact conductor; is engaged with the recess to position the movable contact conductor.