JPS6327413Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention consists of an electromagnetic changeover switch (electromagnetic relay),
In particular, notches are formed on both sides of the base end of the armature, and the neck between both notches is inserted into the armature insertion groove of the L-shaped magnetic pole frame. The above-mentioned notch is engaged with the wall of the armature, and the armature is swingably supported by the magnetic pole frame.

For example, as disclosed in Japanese Utility Model Publication No. 33-19548, such an electromagnetic changeover switch is designed so that the engaging part of the armature and the height of the core of the electromagnetic coil are approximately equal to each other in order to stabilize the operation of the armature. A structure is known in which a spring is provided to match the armature and to press the armature in the direction of its plate thickness.

However, in this conventional type, there is almost no biasing force toward the proximal end or the distal end of the armature, so when the armature swings, it wobbles in those directions and the operation of the armature is affected. It has the disadvantage of being unstable. That is, as shown in FIGS. 6a and 6b, the joint position between the wall portion 1' of the magnetic pole frame and the armature 4 is not determined. Moreover, when the front surface of the wall 1' and _the armature ₄ come into contact as shown in _FIG. may form a surface along the dashed line shown in the figure), which prevents rotation of the armature 4 and causes accidents such as sparks.

Therefore, as shown in FIGS. 3 and 4, a compression spring J that urges the armature 4 away from the electrode coil (not shown) is engaged with the base end of the armature 4, and the spring J is A configuration has been proposed in which the armature 4 is biased toward the base end by a component force toward the base end of the pole.

However _, in this configuration, the same phenomenon as described in the explanation of _FIG . A phenomenon frequently occurs in which the armature 4 is pressed against the wall 1' of the magnetic pole frame by the rotational force of the spring J and is pushed back, and the armature 4 is left at rest in a horizontal position without returning to the state shown in Fig. 3. Ru. Then, by keeping the armature 4 stationary in a horizontal position,
Sparks fly between contacts (not shown), resulting in unstable operation from an electrical point of view, as well as burnout of the contacts. In addition, the component force of the spring J toward the base end of the armature increases or decreases depending on the swing angle of the armature 4, and wobbling in the direction connecting the base end and the tip of the armature 4 is sufficiently prevented. There are some drawbacks that you can't do. Furthermore, during the swinging, the lower surface of the armature 4, the fulcrum
Since H ₁ and H ₂ are rubbed against the wall portion 1', their contact portions are likely to wear, resulting in low durability.

This invention was proposed in view of the above-mentioned conventional circumstances for the purpose of providing an electromagnetic changeover switch with excellent stability, reliability, and durability of the armature operation.

The main feature of this invention is that a spring is mounted across the armature and the magnetic pole frame to bias the armature in the opposite direction to the conventional one, that is, toward the tip of the armature. A more detailed explanation will be given below based on the drawings.

Figure 1 shows one of the electromagnetic changeover switches according to this invention.
A side view of the main part showing an example, and Fig. 2 is a plan view thereof. In the figure, 1 is an L-shaped magnetic pole plate, 2 is an electromagnetic coil, 3 is an iron core, 4 is an armature, and 5 is a driver element. There, the armature and the contact are linked.

Notches 4a are provided on both sides of the base end of the armature 4, and the neck 4b between both notches is inserted into the armature insertion groove 1a of the magnetic pole frame 1.
The structure is similar to that of a conventional electromagnetic changeover switch in that the armature 4 is swingably supported on the magnetic pole frame 1 by engaging the notches 1' with the wall portions 1' on both sides of the switch. Also,
It is also similar to the conventional one in that it is constructed so that the base end of the armature 4 is pressed by a compression spring J to bias the armature 4 in a direction away from the iron core 3.

However, this electromagnetic changeover switch is clearly different from the conventional one in that it is mounted along the armature 4 with a spring S that biases the armature 4 toward its tip side, across the magnetic pole frame 1 and the armature 4. It has a different configuration.

In this example, in order to simplify the structure as much as possible, the spring S is constituted by a torsion spring, the coil portion R of which is engaged with a protrusion P provided protrudingly from the upper surface of the base end of the armature 4, and the spring is opened. Both linear parts of the spring S, which spring in the angular direction, are received by the wall part 1' of the magnetic pole frame 1, and the elastic restoring force of the spring S is configured to bias the armature 4 toward its tip side. be.

Incidentally, the protrusion P at the base end of the armature 4 also serves to engage the lower end of a return spring J that swings the armature 4 in the direction away from the iron core.

In this way, by biasing the armature 4 in the direction of its tip (in the direction of the arrow in Figs. 1, 2, and 5) with the spring S along the armature 4, the rotation angle of the armature 4 is independent. The armature 4 can be received by the surface of the magnetic pole frame 1 on the side opposite to the coil with a constant force directed toward the tip of the armature 4. That is, when the armature 4 swings between the state shown by the two-dot chain line in FIG. 5 and the state shown by the solid line in FIG. Therefore, at least one of the fulcrums H and H' does not separate from the wall portion 1', and so-called chatter phenomenon does not occur.

Furthermore, when the armature 4 shifts from the posture shown by the two-dot chain line in FIG. 5 to the posture shown by the solid line in FIG. Since it does not act in the direction of pinching part 1',
The swinging of the armature 4 is not hindered. Therefore, when the armature 4 moves away from the coil 2,
5th position smoothly without being held still in a horizontal position.
The state is returned to the state shown by the solid line in the figure. Furthermore, since the force of the compression spring J acts as described above, wear of the fulcrums H, H', the lower surface of the armature 4, and the wall portion 1' is reduced.

As explained above, the electromagnetic switch according to this invention has a spring along the armature that urges the armature toward its tip, so the armature can oscillate without any division of the force of the spring. The armature can always be biased toward the tip side with a constant force regardless of the angle of movement.
As a result, at least one of the fulcrums H and H' of the armature is stably and reliably pressed against the side surface of the magnetic pole frame opposite to the coil, so that no chatter phenomenon occurs. Stable operation can be obtained.

Furthermore, when the armature swings away from the electromagnetic coil, the force that urges the armature in that direction does not act in a direction that causes the fulcrum and bottom surface of the armature to touch the wall. Swinging is not obstructed by the magnetic pole frame, the armature is no longer held still in a horizontal position, and sparks do not fly between the contacts and the switch operation becomes unstable due to the spark. Moreover, it is possible to eliminate contact burnout caused by such sparks. Furthermore, since the force that urges the armature away from the electromagnetic coil acts as described above, the contact pressure at the contact area between the armature and the wall is low, reducing wear on the armature and magnetic pole frame. This results in a highly durable electromagnetic switch.

[Brief description of the drawings]

Figure 1 shows one of the electromagnetic changeover switches according to this invention.
Figure 2 is a plan view of the main part showing an example, Figures 3 and 4 are longitudinal sectional side views of the main part showing the moving state of the armature in the conventional product, and Figure 5 is the one based on this invention. FIGS. 6a and 6b are sectional views of essential parts illustrating the operation of the armature of such an electromagnetic switch, and are explanatory views of the operation of the conventional armature. 1...Magnetic pole frame, 1'...Wall portion, 1a...Groove, 4
... Armature, 4a ... Notch, 4b ... Neck, S
……Spring.

Claims (1)

[Scope of utility model registration request] Notches are recessed on both side edges of the base end of the armature, and a protrusion is formed on the upper surface of the base end of the armature, and the neck between both the notches is connected to the armature of the L-shaped magnetic pole frame. The armature is inserted into the insertion groove and swingably supported on both sides of the groove, the coil part of the torsion spring is engaged with the projection, the straight part is received by the magnetic pole frame, and the armature is moved toward the tip. An electromagnetic changeover switch characterized in that, at the same time as being biased, the lower end of a return spring is inserted into the protrusion to bias the armature in the return direction.