JPS5826763B2 - contact spring structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a contact spring that can obtain a large contact gap with a small stroke in an electromagnetic relay or the like.

Conventionally, in order to increase the dielectric strength between the fixed contact and the movable contact in electromagnetic relays, etc., a method of increasing the contact gap has often been used, but in this case, a large stroke is required. The drawback was that the attractive force of the electromagnet was reduced.

In order to improve this drawback, as shown in FIG. 2, if the movable contact is opened and closed using the lever principle, a large contact gap can be achieved with a small stroke.

However, there is a limit to this method; if the protrusion 5, which is the point of action of the lever, comes to a position quite close to the fixed end 4, such as the protrusion 6, it will twist and a large stroke cannot be used. iru.

This is because if the protrusion 6 is moved with the same stroke as the protrusion 5, the spring elasticity of the movable contact piece 1 will be lost and the contacts 2, once closed, will not be able to close again.

Therefore, such a method has limitations.

Also, regarding the contact structure as shown in Fig. 2,
When opening a contact, an electromagnetic force is required to counteract the elasticity of the contact spring, whereas when closing a contact,
Since the contacts close naturally due to the elasticity of the contact springs, no electromagnetic force is required in this case.

Therefore, the force required to open and close the contacts is unbalanced, and the structure is inappropriate for use with electromagnets that have the same attractive force in both opening and closing directions, such as polarized electromagnets.

The present invention eliminates these drawbacks and provides a contact spring structure that can obtain a large contact gap with a small stroke, and is particularly suitable for a polarized electromagnet having a permanent magnet.

The configuration of the present invention will be explained below with reference to the drawings.

FIG. 3 is a diagram showing the principle of the present invention. As shown in the figure, a movable contact 2 is provided at the tip of one side of a movable contact piece 1 consisting of a plate whose base is held between two fixed pieces 4 and 4', and a movable contact 2 is provided on the other side. The fixed piece 4' of the arm is extended as shown in 9 by the center part of the movable contact piece, and the movable contact piece 1
The other side is supported by the fulcrum 10, and the movable protrusion 7 for opening the contact and the contact are placed at an appropriate position between the central part supported by the fulcrum 10 and the movable contact. A movable protrusion 8 for closing is arranged.

Since the present invention has the above-described configuration, FIG. 4a.

bK operates as shown.

FIG. 4 is a diagram illustrating the operating principle of the present invention.

1. To open the contact, press the protrusion 7 as shown in FIG. 4a.

In this way, with the support point 10 as a fulcrum, the displacement of the protrusion 7 is expanded due to the lever principle, and the contact point 2 is largely displaced.

In this case, the support point 10 is not completely fixed to the fixed end 4 so as to be buttoned, but the support point 10 is not completely fixed to the fixed end 4 and the support point 100
Even if the button is pressed in between, it can be freely displaced, so as shown in Figure 4a, the downward curvature causes deflection, so the displacement of the contact point 2 when pressed at the contact position means that the support point 10 is completely fixed. Become more dog-like than usual.

Further, when closing the contact, the protrusion 8 is pressed and brought into contact with the fixed contact 3 as shown in FIG.

Since the present invention has the above-described structure, the contact gap can be made much larger than that of the conventional one, and as shown in FIG. 5, the spring load A when closing the contact and the spring load when opening the contact are Since the load B can be made almost the same size, it is ideal for use in electromagnets that have an attractive force in both the closing direction A and the opening direction, such as polarized electromagnets with permanent magnets. It is.

An embodiment using a polar electromagnet is shown in FIG.

A polarized electromagnet is an electromagnet made by combining a permanent magnet and an electromagnet, and when a positive current is passed through the coil wound around the yoke 11, and when a current is passed in a negative direction, the N-pole magnet 14 or Because it is attracted to the S-pole magnet 15, the axis 1
3 and rotate in opposite directions.

In the embodiment of FIG. 1, the button has a protruding portion 7 for pressing the movable contact piece 1 against the card portion 16 formed integrally with the armature 12.
8 and 1, the contacts can be opened and closed by switching the current in the positive and negative directions.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the present invention, Fig. 2 is a side view of a conventional example, Fig. 3 is a side view of the present invention, and Figs. 4 a and b explain the principle of operation of the present invention. The side view, FIG. 5, is a diagram showing the relationship between spring load and stroke for taking the contact gap. 1 is a contact spring, 2 is a movable contact, 3 is a fixed contact, 4 is a fixed end, 7 and 8 are protrusions, and 10 is a support component.

Claims (1)

[Claims] A movable contact opposite the fixed contact is provided at the tip of one side of a movable contact piece made of a plate whose base is held between 12 fixed pieces, and a fixed piece on the other side is attached to the center part 1 of the movable contact piece. to support the movable contact piece with its other side visible, and
A contact is characterized in that a movable protrusion capable of pressing the movable contact piece in both the direction of opening and closing the contact is arranged at an appropriate position between the movable contact and the central part supported on its other side. Ne structure.