JPS5811061B2 - latching relay - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of a latching relay.

Latching relays are also called latch-in relays or keep relays. In this type of latching relay, when the electromagnet is energized, the contacts shift from state A (off) to state B (on), cutting off the excitation. It is possible to maintain state B even when the magnet is turned on, and it has means that can return (reset) state A to state A separately from energization and de-energization.

Figures 1 and 2 show examples of conventional latching relays, and especially for protection of testers (circuit meters), etc., the reset button, which is the transmission element for manual reset, moves when the protection is activated, and the operating status is changed. The second one has the advantage of being able to display
A system similar to the example shown in the figure is often used.

Here, first, the latching relay will be explained.

When an electromagnet consisting of a coil 1 and an iron core 2 is excited and attracts a movable iron piece 3, this relay has a locking hook 5 integrated with a transmission element 4 called a reset lever.
The engagement between the letter-shaped locking mechanism and the movable iron piece 3 is through shafts 6A and 6B.
The movable iron piece 3 maintains a state similar to the state in which it is attracted by the electromagnet.

Therefore, even if the excitation of the electromagnet is interrupted, the state is maintained.

When a clockwise force is applied to the transmission element 4 around the shaft 6A from the outside using a finger or the like, the engagement between the locking hook 5 and the movable iron piece 3 is released, and the movable iron piece 3 is moved by the coil spring 7. It receives a force in the direction of arrow 8 due to the elastic force of , and returns to the initial state shown in the figure.

However, as shown in FIG.
When connecting to protect coil 1 by detecting an excessive input current from 0 or 11 using the latching relay RA shown in Fig. 1 and disconnecting the power supply system of the circuit, coil 1 is connected to the The electromagnet may be adjusted so that the contacts 12 and 13 open when it passes.

However, in the case of the latching relay shown in Fig. 1, if an excessive input current exceeding a predetermined value passes through the coil 1, the contact 12
．． 13 is immediately opened and its off state is maintained and latched.

After this, if an attempt is made to return the transmission element 4 by pushing it in the direction of the arrow 8 while the cause of the excessive input current remains in the terminals 10 and 11, the relay RA becomes like a normal relay.

Therefore, in the case of the circuit connection shown in FIG. 3, relay RA is in an intermittent energized state like a buzzer, and the cause of the excessive input connected to terminals 10 and 11 is intermittently connected to measuring instrument circuit 9. It turns out.

Needless to say, in such a case, the measuring device circuit 9 may be destroyed.

On the other hand, FIG. 2 shows an example of a latching relay often used in testers, in which a transmission element 15 called a reset button is provided with a locking hook 5 that engages with a movable iron piece 3, and is slidable by a support 16. is supported by

In this figure, it engages with the movable iron piece 3 and is stopped by the force of the contact 17A of the leaf spring 17.

When the movable iron piece 3 is attracted to the iron core 2, the engagement is released, and the transmission element 15 moves upward under the force of the leaf spring 17.

For this reason, the contact 1 pushing the transmission element 15 upwards
7A moves upward at the same time, contacts 17A and 18 open, and contacts 17A and 19 close.

However, when this relay is used in place of relay RA in Fig. 3, the transmission element 15 should be pushed downward by hand to return it to its original state, with the cause of the excessive input current remaining at terminals 10 and 11. Then, the contact point 12.13 in Fig. 1
The contacts 17, 18 corresponding to are forced closed and the source of the excessive input current remains undesirably connected to the meter circuit 9 unless the hand force is removed from the transfer element 15.

As mentioned above, in conventional launching relays, when external force is applied with a finger etc. for manual reset, the function as a protective relay is forcibly prohibited, or the function becomes the same as a normal relay. This has the disadvantage that it cannot achieve the purpose of protecting the circuit system.

SUMMARY OF THE INVENTION It is therefore an object of the invention to provide a latching relay that does not have the above-mentioned drawbacks.

This invention will be explained below.

In this invention, when the electromagnet is excited and attracts the movable iron piece, the engagement between the movable iron piece and the locking hook changes, and the contact point is moved from the first state position to the second state position and held. Regarding a latching relay, which is equipped with a latching mechanism that allows the transmission element to return from the second state position to the first state position when an external force is applied, the transmission element moves in conjunction with the contact and another second contact, maintains the state position of both contacts at a state position equivalent to the second state position in terms of function on the circuit, and maintains this state position. A return means is provided which can return both contacts to the same state as the first state position when the external force is removed from the contact point.

That is, in the present invention, as shown in the embodiment of FIG. 4, a return means 20 is provided together with the transmission element 15.

As a result, the movable iron piece 3 is attracted to the iron core 2 and the movable iron piece 3
When the engagement between the locking hook 5 and the locking hook 5 is released, the transmission element 15 moves upward and its reservoir moves from position C to position D in the figure and stops.

At the same time, contacts 21.22 open, and contacts 21.23
The fact that the circuit is closed is the same as in the case of FIG.

At this time, the top of the return means 20 is moved to E as shown in the figure due to its own weight.
It has stopped at the position (above D).

This state is a state in which the contacts 21 and 22 are open due to the protective operation.

By the way, manual return is achieved by pushing down the return means 20 or the transmission element 15 with a fingertip or the like, but when the top of the return means 20 is pushed down from position E to D in the figure, the transmission element 15 also receives that force. and is pushed down together with the return means 20.

Then, when both tops are pushed down to below the position C, the engagement between the movable iron piece 3 and the locking hook 5 is restored.

Here, while the external force is applied, the return means 20
presses the contact 23, and the contact 23 presses the spacer 2 made of an insulating material.
Since the contact 22 is pushed through the contact 4, the contacts 21 and 22 remain open, and the circuit functions remain the same as after the above-mentioned protective operation.

The same applies to the contacts 21 and 23.

Therefore, when used as a circuit as shown in FIG. 3, if contacts 21 and 22 are used instead of contacts 12 and 13, the contacts will remain open while force is applied to the transmission element 15 and the return means 20. Therefore, there will be no problem with protection.

When the external force is removed, the state shown in FIG. 4 is restored, and everything returns to its initial state.

Furthermore, the latching relay shown in FIG. 5 is an embodiment in which the coaxial structures of the transmission element 15 and the return means 20 shown in FIG. For example, if the material is used, the transmission element 1
5 may be colored red to indicate that the top of the transmission element has moved from the F position to the G position by performing a protective action.

Further, FIG. 6 shows an embodiment in which the role of the transmission element 15 is only to transmit force, and in this case, the movement of the transmission element 15 cannot be displayed on the outside of the relay.

In the figure, 25 is an insulating spacer, and 26 is a locking hook made of an insulating material.

As described above, since the latching relay of the present invention performs a reliable latching action against twisting, it is extremely safe as a protection relay for a circuit system.

In each of the above-mentioned embodiments, it is also possible that the contact 23 of the leaf spring is not provided and the lower end of the return means 20 directly pushes the contact 22, or the contact 22 of the leaf spring is not provided and the return means 20 is the contact. It is also possible to press only 23.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of drawings]

Figures 1 and 2 are block diagrams showing an example of a conventional latching relay, Figure 3 is a diagram showing an example of using a latching relay as a circuit protector, and Figures 4 to 6 are respectively diagrams showing the configuration of a conventional latching relay. FIG. 1 is a configuration diagram showing an embodiment of the invention. 1... Coil, 2... Iron core, 3...
...Movable iron piece, 4...Transmission element, 5,26.
.....Lock hook, 6A, 6B ....shaft, 7 ....coil spring, 8 ....arrow, 9 ....measuring instrument circuit, 10.11...
・Terminal, 12, 13.17A, 18, 19, 21゜22
．． 23...Contact, 15...Transmission element,
16... Support body, 17... Leaf spring, 2
0...Returning means, 24.25...Spacer, 26...Lock hook.

Claims (1)

[Claims] 1. When the electromagnet is excited and attracts the movable iron piece, the engagement between the movable iron piece and the locking hook changes, and the contact can be moved and held from the first state position to the second state position. A latching relay including a latching mechanism and a transmission element capable of returning the contact from the second state position to the first state position by applying an external force, when the external force is applied. moving in conjunction with the transmission element to move the contact and another second contact, and maintain the state positions of both contacts at state positions equivalent to the second state position in terms of circuit function; A latching relay characterized in that a return means is provided which can return both of the contacts to the same state as the first state position when the external force is removed from this state position.