JPH0142286Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an electric switchgear, and particularly relates to an improvement in the structure for positioning a cradle.

[Prior art]

2. Description of the Related Art Conventional electrical switching devices, such as circuit breakers and disconnectors, are constructed as shown in FIGS. 1 to 5.
Figure 1 shows the on state of the circuit breakers, Figure 2 shows the off state of the circuit breakers, Figure 3 shows the trip states of the circuit breakers, and Figures 4 and 5 show the trip states of the circuit breakers. The main parts of the circuit and disconnector are shown respectively. In the figure, 1 is a cover made of an insulating material, 2 is a base made of an insulating material on which the cover 1 is placed, 3 is a casing made of the cover 1 and the base 2, and 4 is the base 2.
A fixed contact made of a conductive material fixed on the top, having a terminal portion 5 at one end so that an external conductor (not shown) can be connected, and a fixed contact 6 on the upper surface of the other end. . 7 is a movable contact made of a conductive material and has a movable contact 8 facing the fixed contact 6 in one piece; 9 is a movable contact arm that rotatably supports the movable contact 7 by a pivot pin 10; , 11 is a contact pressure spring interposed between the movable contact arm 9 and the movable contact 7 to constantly bias the movable contact 7 in the direction of the fixed contact 6, and 12 is a contact pressure spring arranged in parallel to all poles. A cross bar 13 made of an insulator connects one end of each of the movable contact arms 9, and a cross bar 13 connects both the contacts 6, 8.
An arc-extinguishing magnetic plate made of a magnetic material and having a substantially V-shaped or substantially U-shaped notch on the inside of a pair of arc-extinguishing side plates 14 made of an insulating material in a day ion arc extinguishing device that extinguishes an arc generated between the two. 15 are arranged at predetermined intervals. 16 has one end connected to the movable contact arm 9.
A lower link 18 is rotatably supported by a shaft 17, and one terminal of the lower link 18 is connected to the other end of the lower link 16, and the other end is connected to the cradle 19 of shafts 20 and 21, respectively.
The upper link 22 is rotatably supported by the lower link 16, the upper link 18 and the shaft 20.
23 is a handle arm whose one end is rotatably supported at a predetermined relative position with respect to the toggle link mechanism 22, and 24 is a spring-loaded pin at one end. A doggle spring 26 whose other end is stretched from the shaft 20 to the handle arm 23 via 25 can be operated from the outside of the cover 1, and interlocks with the handle arm 23 by a handle made of an insulating material. 27 is a bimetal connected to the movable contact 7, and 28 is this bimetal 27.
The fixed core 29 is fixed to the fixed core 28.
30 is a rotatable trip bar to which the movable iron core 29 is fixed; 31 is a turntable that is normally locked on one side with the cradle 19 and on the other side with the trip bar 30; A movable latch, 32 is a cradle shaft that rotatably supports the cradle 19, 32 is a stopper that latches the cradle 19 during tripping,
It is engaged and fixed to the frame 34. The frame 34 also supports the fulcrum for positioning the cradle shaft 32 and rotating the latch 31, as described above.

Next, the operation will be explained. That is, in FIG. 1, when the handle 26 is tilted to the closing position (closing position) with the cradle 19 locked to the latch 31, the toggle link mechanism 22 is extended, the movable contact 8 is brought into contact with the fixed contact 6, and the The state shown in Figure 1 is reached. Next, when the handle 26 is tilted to the open position (tilted to the left), the toggle link mechanism 22 is bent and the movable contact 8 is separated from the fixed contact 6, resulting in the state shown in FIG. 2. On the other hand, when an overcurrent flows through the circuit in the closed circuit state, the bimetal 27 or the movable iron core 29 is activated and the engagement between the cradle 19 and the latch 31 is released. Rotated. Therefore cradle 19 and upper link 1
8 connection point, that is, the line of action of the toggle spring 24 on the shaft 21, the toggle link mechanism 22 is bent by the spring force of the toggle spring 24. In both cases, the movable contact 8 is separated from the fixed contact 6, resulting in the trip state shown in FIG. FIG. 4 is a partial view showing the frame 34, and FIG. 5 is a perspective view showing its configuration. In FIG. 5, the cradle 19 is located at the center of the frame 34 and at the cradle shaft 32.
In order to position the cradle 19 perpendicularly to the cradle 19 and the sleeve 36, the cradle 19 and the sleeve 36 are fixed by press fitting or brazing, and are rotatably engaged with the cradle shaft 32 so as to be positioned by the end of the sleeve 36 and the inner wall of the frame 34. The cradle 19 is stopped by a stopper 33 in the tripped state.

Since the conventional electric switchgear is configured as described above, it requires a sleeve 36 to vertically fix the cradle 19, and also requires press-fitting or brazing for positioning, which requires a large number of parts. It is expensive and has drawbacks such as difficulty in processing and assembly.

[Summary of the idea]

This idea was made in order to eliminate the drawbacks of the conventional electric switchgear as mentioned above.The cradle is configured in a U shape and the cradle shaft is stepped, thereby eliminating the need for a sleeve and making it possible to use press-fitting or brazing. The purpose of the present invention is to provide an economical switchgear that is easy to assemble and can eliminate the work involved.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings. FIG. 6 is a partial sectional view showing the main points of this invention, and FIG. 7 is a perspective view thereof. 19, as shown in FIG. 6, is a U-shaped cradle;
Main part 19a having an engaging part with the latch, vertical bent part 19d parallel to cradle shaft 32, and main part 19a
It consists of a sub-portion 19b parallel to . The main part 19a and the sub part 19b each have one hole 119a and 119b of different sizes, and 34 is a frame, and like the cradle 19, one hole 34a and 34b of different sizes is provided in each of the left and right walls. It is provided. 19c is a temporary fixing fulcrum. 32 is a cradle shaft; a small diameter part 32 that positions the smaller hole 119b of the secondary part 19b of the cradle 19; a large diameter part 32 that positions the hole 119a of 32a and the main part 19a;
b is provided, and the cradle 1 is placed in the frame 34.
After inserting the cradle 9, the cradle shaft 32 engages and positions the cradle 19 through the hole, and as shown in FIG. 6, the wall of the base 2 forms a retainer.
33 is a stopper and stops the cradle 19.

By forming the cradle 19 in a U-shape, it can be positioned perpendicularly to the cradle shaft 32, and the small diameter portion 32a provided on the cradle shaft 32 allows the engagement portion of the cradle 19 with the latch 31 to be positioned at the center of the frame 34. In addition, the base 2 loosely fits the cradle shaft 32 to prevent it from coming off.
This allows the cradle 19 to rotate.

In the above embodiment, the cradle 19 is provided with a pair of holes 119a and 119b of different sizes, but as shown in FIGS. 8 and 9, a pair of holes 119c and 119d of the same size are provided, and the cradle Even if the length of the small diameter portion 32a of the shaft 32 is changed, the same effect can be achieved.

[Effect of idea]

As is clear from the above description, this invention has the following effects.

(a) By providing a step on the cradle shaft, there is no need for brazing or press-fitting to set the cradle vertically and in a predetermined position.

(b) Therefore, deterioration due to peeling of the brazed portion can be prevented and reliability is improved.

(c) Since no sleeve is required, the number of parts is small and it is economical.

(d) Since the cradle shaft can be made thicker than conventional ones, the strength of the cradle shaft is increased and deterioration due to bending etc. can be prevented.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 show the operation of the electrical switchgear, and show the on state, off state, and trip state, respectively. FIGS. 4 and 5 show partial structural diagrams of a conventional electrical switchgear. Figures 6 and 7
The figure is a partial structural diagram showing one embodiment of the present invention.
FIG. 9 shows another embodiment. 19...Cradle, 19a...Main part of the cradle, 19b...Subpart of the cradle, 32...Cradle shaft, 33...Stopper, 34...Frame,
36...Sleeve. In the drawings, parts with the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) A handle arm that is pivotally supported at one end and rotates to a predetermined relative position with respect to the toggle link mechanism, and a tension member between the handle arm and the elbow of the toggle link mechanism a toggle spring, a handle for operating the handle arm;
and a movable contact that moves into and out of contact with the fixed contact via the toggle link mechanism by the handle;
a cradle having a temporarily fixed fulcrum of the toggle link mechanism, which is rotatably supported at one end and engaged with a latch that is freely disengaged at the other end; a cradle shaft that rotatably supports the cradle; An electric switchgear comprising: a stopper for restricting rotation of the cradle when the cradle is rotated; and a frame for positioning the cradle and the stopper; The auxiliary parts parallel to the main part are each provided with a hole for fitting with the cradle shaft, and the cradle shaft has a step consisting of a large diameter part and a small diameter part for positioning the cradle, The electric switchgear characterized in that the frame has coaxial holes of different sizes that fit into the large diameter part and the small diameter part of the cradle shaft, respectively. (2) The electric switchgear according to claim 1, wherein the holes provided in the main part and the sub part of the cradle have different sizes. (3) The electric switch according to claim 1, wherein the holes provided in the main part and the sub part of the cradle are equal in size and fit into the small diameter part of the cradle shaft. Device.