JPH064507Y2 - Movable contact support lock device for electromagnetic contactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a movable contactor support locking device for restraining an arc extinguishing chamber case detachably attached to an electromagnetic contactor in a contact-separated state at the time of removal.

[Conventional technology]

The electromagnetic contactor with which the arc-extinguishing chamber case can be removed is shown in FIGS. 12 to 16 and 17 to 19.
Two different examples shown in the figures are known. First of all
2 to 16, the electromagnetic contactor includes a contactor device 20 disposed on the body case 1, and an electromagnet 30 that is in contact with the contactor device and is housed in the body case 1 to open and close the contactor device 20. The main part is composed of an arc-extinguishing chamber case 2 which is covered with the contact device 20 and detachably attached to the main body case 1. The contact device 20 is arranged on the main body case 1 so as to be opposed to each other with a space therebetween, and fixed contacts 13 and 13 having fixed contacts 11 and 11 on opposite sides and terminals 12 and 12 extended to opposite sides. Fixed contact 13,13
Is supported on the upper end of a movable contactor support 14 which is slidably guided in the up-down direction between the opposite ends of the fixed contact 11,
The movable contactor 15 to be released and the contact spring 16 for applying a contact pressure to the movable contactor 15 are provided as main components. The electromagnet 30 includes a fixed iron core 21 fixed to the bottom of the main body case 1 and an exciting coil 2 wound around the fixed iron core 21.
2, a movable iron core 23 arranged to face the fixed iron core 21 and connected to the movable contactor support 14 of the contactor device 20, and a return spring 24 elastically mounted between the movable contactor support 14 and the main body case 1. Is provided as a main component. Although only one side is illustrated in the both side ears 1a, 1a in the width direction of the main body case, the long holes 1b penetrating from the joint surface with the arc extinguishing chamber case 1 along the both side walls of the main body case 1 and the ears. Parts 1a, 1
A slot 1c is provided on the back side of a, and a narrow groove 1c orthogonal to the elongated hole 1b is provided. Although only one side is shown on both sides of the arc-extinguishing chamber case 2, there is a mounting hole 2c consisting of a large-diameter portion 2a on the upper side and a small-diameter portion 2b on the joining surface side which coincide with the elongated hole 1b of the main body case 1. It is provided. On the other hand, the main body case 1 and the arc extinguishing chamber case 2 are connected by a fixed shaft 3 and a coil spring 4, the fixed shaft 3 is composed of a head 3a and a shaft portion 3b, and a groove 3c is provided on the top of the head 3a. A pin 5 is fixed through the tip of the shaft portion 3b along the direction of the groove 3c. Then, the coupling is performed by inserting the fixed shaft 3 around which the coil spring 4 is wound into the mounting hole 2c so that the pin 5 is aligned with the elongated hole 1b, and confirming that the pin 5 has passed through the elongated hole 1b. At 90
When the pin 5 is engaged with the narrow groove 1c by being twisted by a degree and the pressing by the screwdriver is released, the pin 5 is fixed by the spring force of the coil spring 4. That is, inserting the fixed shaft 3 into the mounting hole 2c, which is similar to one-touch operation, and attaching the fixed shaft by screwdriver to the coil spring 4
It is fixed by a simple operation of spreading and pressing and twisting 90 degrees.

Next, in FIGS. 17 to 19, the only difference between this example and the above-mentioned example is the fixed shaft 6, and the tip of the shaft portion 6b of the fixed shaft 6 is directed toward the groove 6c of the head portion 6a. That is, the locking portion 6d is formed by bending. Therefore, the function and the combining operation are the same as in the above-mentioned example.

[Problems to be solved by the device]

In such a conventional device, when the arc extinguishing chamber case 2 is removed, the state shown in FIG. 13 is obtained. That is, if the arc extinguishing chamber case 2 is removed and the control circuit power supply for the exciting coil 22 is opened / closed by mistake for maintenance or the like, the contact device 20 does not have a breaking capability and opens / closes the electric circuit. As a result, there is a problem in that the circuit cannot be interrupted or a phase-to-phase short circuit occurs, and the accident is not limited to the electromagnetic contactor and may spread to other devices such as devices connected to the electric circuit.

The object of the present invention is to eliminate the above-mentioned conventional problems, and to open / close the contact device even if the exciting coil control power supply is opened / closed by mistake when the arc extinguishing chamber case is removed. It is an object of the present invention to provide a movable contactor support locking device for an electromagnetic contactor that is not locked.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, this invention joins a mounting hole, which is provided on both sides in the width direction of the arc-extinguishing chamber case and has a large-diameter portion and a small-diameter portion along the wall surface, with a long hole communicating with the mounting hole. A main body case provided on the surface and provided with a guide hole that intersects the elongated hole and penetrates from the side wall to the inner wall; and the guide hole in the main body case slidably guided in the vertical direction in the contact open state. And a movable contactor support having a recess on at least one side corresponding to the above, a head having a groove at the top through the mounting hole and the elongated hole, and a top side of the guide hole at the tip through a coil spring. A fixed shaft provided with a locking portion to be engaged with the fixed shaft, which is guided forward and backward to at least one side of the guide hole, engages with the locking portion of the fixed shaft, and is twisted when the arc extinguishing chamber case is removed. And a lock piece that fits in the recess. It may be formed by bending the locking portion of the fixed shaft into an L shape at the tip.

[Action]

In the movable contact support lock device according to the present invention,
Attaching the arc-extinguishing chamber case to the main body case A lock piece that engages with the twisting operation of the fixed shaft in the arc-extinguishing chamber case removal direction and fits into the recess of the movable contact support is attached to the main body. With the configuration provided in the case, the contact device can be reliably locked in the open state by removing the arc extinguishing chamber case. Therefore, accidents during maintenance and inspection are avoided and safety is secured.

〔Example〕

1 to 6 are views showing an embodiment of a movable contact supporting lock device for an electromagnetic contactor according to the present invention. FIG. 1 is a side view showing a partial longitudinal section, and FIG. 2 is an arc extinguishing chamber. FIG. 3 is a perspective view with the case removed, FIG. 3 is an enlarged vertical sectional view of an essential part in an unlocked state, FIG. 4 is a sectional view taken along the line III-III in FIG. 3, and FIG. 5 is FIG. 4 in a locked state. The corresponding cross-sectional view, FIG. 6 is a perspective view of essential parts. In the figure, the same parts as those of the conventional device of FIG. The outline of the difference between this embodiment and the conventional apparatus is that the arc-extinguishing chamber case 2 is the main body case 1.
The movable contactor is engaged with the locking pin 5 of the fixed shaft 3 to be mounted on the movable shaft 3 by engaging in a twisting operation of the fixed shaft 3 in the direction of removing the arc-extinguishing chamber case, and is fitted into the recess 14a provided in the movable contactor support 14. Lock piece 3 for restraining the support 14 in the opened state of the contact device 20
1 is provided in the main body case 1. For this purpose, the main body case 1 is provided with a rectangular guide hole 1d which penetrates from the outer wall to the inner wall by intersecting the elongated hole 1b, which is shown only on one side, on both side ears 1a, and contacts the movable contactor support 14. The aforementioned recess 1a is provided which coincides with the guide hole 1d when the slave device 20 is in the open state. The recess 14a is best provided on both sides, but it may be on only one side. And guide hole 1
A lock piece 31 shown in FIG. 6 is guided in a forward and backward direction at d, and the lock piece 31 is a lock piece 3 which can be fitted into the recess 14a.
1a and an L-shaped through hole 31b into which the pin 5 of the fixed shaft 3 is fitted and can be twisted by 90 °.

In the above configuration, the arc extinguishing chamber case 2 is attached to the main body case 1 by first placing the arc extinguishing chamber case 2 on the main body case 1 with the contactor device 20 in the open state, and then by the lock piece 3
As shown in FIG. 5, the lock piece 31 is inserted and locked in the guide hole 1d until the lock piece 31a is fitted into the recess 14a of the movable contact support 14. Fixed shaft 3 at this time
Although the pin 5 is located in the long hole 16 of the ear portion 1a, the head portion 3a of the fixed shaft 3 is pushed against the coil spring 4 by a screwdriver and twisted in the P arrow direction of FIG. The tip of the pin 5 hits the inner wall of the through hole 31b of the lock piece 31, and the lock piece 3
When 1 is moved to the right and the pushing force by the screwdriver is released, the pin 5 is engaged with the narrow groove 1c and positioned. As a result, the movable contact support 14 is unlocked, and at the same time, the arc extinguishing chamber case 2 is fixed to the main body case 1. Next, in order to remove the arc-extinguishing chamber case 2 for maintenance and inspection, it is sufficient to carry out the above-mentioned reverse operation to bring the lock piece 31 into the locked state, and in this state, the exciting coil 22 can be opened and closed by the control circuit power supply. Contact device 20
Since is locked in the open state, accidents such as inability to cut off and short circuits between phases will not occur. 7 and 8 are modified examples of the lock piece 31, and the lock piece 32 of FIG. 7 is different in that guide ridges 32a and 32a are provided on both sides in the sliding direction. The lock piece 33 in the figure is the ear 1
The difference is that a ridge 33a that engages with the narrow groove 1c of a is provided. Therefore, the lock piece 32 is the ear 1 of the body case 1.
It is convenient when the thickness of a is small, and there is an advantage that the lock piece 33 can easily slide in the guide hole 1d.

9 to 11 are views showing another embodiment of the present invention. Only the fixed shaft 6 is different from the embodiment of FIG. 1 described above, and the tip of the shaft portion 6b of the fixed shaft 6 is different. However, the locking portion 6d is formed by bending the head portion 6a in the direction of the groove 6c. Therefore, the function and the combining operation are the same as those in the above-described embodiment, and the description thereof is omitted.

[Effect of device]

According to this invention, by utilizing the locking portion of the fixed shaft that attaches the arc-extinguishing chamber case to the main body case, it can be inserted into the recess provided in the movable contactor support in the contactor device opened state and guided to the main body case. The locked piece is inserted into the recess by twisting the fixed shaft that accompanies the removal of the arc-extinguishing chamber case, so the workability of attaching and detaching the arc-extinguishing chamber case is ensured and reliability is ensured. It is possible to provide a movable contactor support locking device for a high electromagnetic contactor.

[Brief description of drawings]

1 to 6 are views showing an embodiment of a movable contact supporting lock device for an electromagnetic contactor according to the present invention. FIG. 1 is a side view showing a partial longitudinal section, and FIG. 2 is an arc extinguishing chamber. FIG. 3 is a perspective view with the case removed, FIG. 3 is an enlarged vertical sectional view of an essential part in an unlocked state, FIG. 4 is a sectional view taken along the line III-III in FIG. 3, and FIG. 5 is FIG. 4 in a locked state. Corresponding transverse sectional views, FIG. 6 is a perspective view of essential parts, FIGS. 7 and 8 are perspective views showing modified examples of FIG. 6, and FIGS. 9 to 11 are electromagnetic contacts according to the present invention. FIG. 9 is a view showing another embodiment of the movable contactor support lock device of the container, FIG. 9 is an enlarged vertical cross-sectional view of an essential part of the unlocked state, and FIG. 10 is a cross-sectional view taken along line IX-IX of FIG.
11 is a cross-sectional view corresponding to FIG. 10 in the locked state,
12 to 16 are views showing an example of a conventional electromagnetic contactor, FIG. 12 is a side view showing a partial longitudinal section, FIG. 13 is a perspective view with an arc extinguishing chamber case removed, and FIG. Is an enlarged plan view of an essential part, FIG. 15 is a longitudinal sectional view of FIG. 14, and FIG.
FIG. 5 is a rear view, FIGS. 17 to 19 are views showing another example of the conventional electromagnetic contactor, and FIG.
8 is a vertical sectional view of FIG. 17, and FIG. 19 is a rear view of FIG. 1 ... main body case, 1b ... long hole, 1d ... guide hole, 2
…… Arc extinguishing chamber case, 2a …… Large diameter part, 2b …… Small diameter part,
2c ... mounting hole, 3,6 ... fixed shaft, 3a, 6a ... head part, 3c, 6c ... groove, 5 ... pin, 6d ... locking part,
14 ... Movable contact support, 14a ... Recess, 20 ... Contact device, 31, 32, 33 ... Lock piece.

Claims (1)

[Scope of utility model registration request] 1. An arc-extinguishing chamber case having mounting holes formed on both sides in the width direction and having a large-diameter portion and a small-diameter portion along a wall surface, and a long hole communicating with the mounting hole, which is formed on the joint surface. A main body case provided with a guide hole that intersects the hole and penetrates from the side wall to the inner wall; and a concave portion on at least one side that is guided slidably in the main body case in the vertical direction and that coincides with the guide hole in the contact open state. A movable contactor support provided with a place, a head having a groove at the top through the mounting hole and the elongated hole, and a locking portion that engages with the top side of the guide hole at the tip through a coil spring are provided. A fixed shaft, and a lock piece that is guided forward and backward to at least one side of the guide hole and engages with a locking portion of the fixed shaft and is fitted into the recess by twisting accompanying removal of the arc-extinguishing chamber case. A movable contact supporting lock device for an electromagnetic contactor characterized by comprising: .