JPS622418B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a two-point switching device.

It has been known that two-point switching devices have higher voltage resistance between terminals than single-point switching devices, and are widely used to open and close high-voltage circuits. It is not easy to make adjustments during assembly to make them turn on at the same time, and a phenomenon occurs where only one of the contacts opens or closes the circuit, and as that contact wears out, this tendency becomes stronger, so it is necessary to close all contacts. The drawback was that it could not be used effectively. The present invention has been made in view of the above points, and conversely, a time difference is provided between the opening and closing times of both contacts, heat-resistant material is used only for the contacts that essentially open and close the circuit, and the heat-resistant material is used along the longitudinal direction of the contact spring plate. By arranging both fixed contacts together and making the contact farther from the fixed end of the contact spring plate the contact that essentially opens and closes the circuit, the cost of contact materials can be reduced and the opening/closing speed of the circuit opening/closing contact can be reduced. The purpose of the present invention is to make the entire structure thin and eliminate the adjustment of contact opening/closing timing as in the prior art.

To explain in detail with example diagrams, Fig. 1 and Fig. 2
The figure shows a switchgear that cuts two circuits at two points each, in which a contact spring plate 1 is branched into two by cut grooves 2 to form a short piece 3 and a long piece 4, and the short piece 3 is bent toward the fixed contact 5 side. By doing so, the contacts 6 close earlier than the long pieces and open later, and the contacts 7 and 8 on the long piece 4 side are made of a heat-resistant material. The fixed end of the contact spring plate 1 is fixed to a movable iron piece 10 via a molded body 9, and the movable iron piece 10 is connected to the coil 1.
It rotates in one direction depending on the direction of the excitation current flowing through the magnet 1, and is latched and held by the permanent magnet 12. That is, this embodiment is a polarized latching relay, and the movable iron piece 10 is attracted to the direction in which the magnetic pole at the tip of the yoke 13 becomes the same as the magnetic pole of the permanent magnet 12.

In the present invention, as described above, the contact spring plate 1 is bifurcated to form the short piece 3 and the long piece 4, and the long piece 4 substantially opens and closes the current in the circuit.
No arc is generated at the contact point of the short piece 3, so there is no need to use heat-resistant material for the contacts 5 and 6.
In addition, since the long piece 4 has a large turning radius, the contact opening speed is high and the generation of arc can be suppressed, and the short piece 3 does not need to increase the contact opening speed, so both fixed contacts 5 and 7 can be used as contacts. There is an advantage that the spring plate 1 can be arranged substantially in a straight line along the longitudinal direction of the spring plate 1, and that the entire two-point disconnection device can be made thin. Also, as mentioned above, both movable contacts 6,
By actively setting a time difference between the opening and closing of 8,
This has the advantage that delicate adjustment of simultaneity is not required and that the contact life can be accurately set using only the circuit opening/closing contacts 5 and 6.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional top view showing an embodiment of the present invention, and FIG. 2 is a perspective view of the same essential parts. 1... Contact spring plate, 2... Cut groove, 3... Short piece, 4... Long piece, 5, 7... Fixed contact, 6, 8...
...Movable contact.

Claims (1)

[Claims] 1 The contact spring plate is bifurcated into two parts by cut grooves to form a short piece and a long piece, and the short piece closes the contact earlier and opens later than the long piece, and uses heat-resistant material for the contact on the long side. A two-point switching device characterized by: