JPS6230774Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a relay that opens and closes contacts using bimorphs.

Generally, the displacement of a bimorph is minute, so in a relay in which contacts are attached to the tips of the bimorph, the distance between the contacts when the contacts are in an open state is minute. When external vibrations or shocks are applied to such relays, the open contacts contact each other due to these forces, causing malfunctions. Furthermore, since the distance between the contacts is minute, the withstand voltage between the contacts also decreases. In response to this, attempts have been made to expand the displacement of the bimorph using a cantilevered hinge type lever and increase the distance between the contact points, but the impact resistance against impact in the direction of lever operation is insufficient. However, like the above, it has the drawback of causing malfunctions.

This idea was devised to eliminate the above-mentioned drawbacks.By providing movable contacts at both ends and using a rotary movable piece whose weight is balanced at both ends, it is possible to stabilize the operation and prevent external interference. The aim is to provide a relay that can handle vibrations and shocks and prevent malfunctions.

Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 1 is a plan view of a relay according to an embodiment of this invention. In this figure, 1 is a conductive movable piece with movable contacts 2a and 2b at both ends,
Both ends are supported by the rotating shaft 3 so as to be balanced in terms of weight. The movable contacts 2a and 2b protrude in opposite directions with the movable piece 1 in between in the rotating direction of the movable piece 1. 4a and 4b are a pair of piezoelectric bimorphs, the base ends of which are fixed members 5a and 5b.
The movable piece 1 is supported by the movable piece 1 and is electrically connected to a drive circuit, which will be described later, and has pressing pieces 6a and 6b for pressing the movable piece 1 at its tip. Both bimorphs 4a and 4b act on the movable piece 1 at the same time and drive the movable piece 1 to rotate in one direction. Therefore, on both sides of the movable piece 1, there are two symmetrical points of the movable piece 1 with the rotation axis 3 as a boundary. are arranged so as to press equally. 7a, 7b connect the movable contacts 2a, 2b to the respective fixed contacts 8a,
Return springs 9a and 9b are separated from 8b and are fixed contact terminals provided with fixed contacts 8a and 8b.

FIG. 2 is a bimorph drive circuit diagram. In this figure, reference numeral 10 denotes an inrush current suppressing resistor, which functions to suppress the value of current flowing through the circuit when charging the bimorphs 4a and 4b. 11 is a discharge resistor that causes the bimorphs 4a and 4b to discharge. 1
2 is a power supply, and 13 is a switch.

In FIG. 1, when a predetermined voltage is applied to the bimorphs 4a, 4b, the bimorphs 4a, 4b
b bends in the direction of arrow A. As a result, as shown in FIG.
7b, the movable contacts 2a, 2b come into contact with the fixed contacts 8a, 8b, and the fixed contact terminals 9a,
9b is electrically connected. When the voltage application is cut off, the bimorphs 4a, 4b return to their original states. At this time, the movable piece 1 is reversely rotated by the return springs 7a and 7b, the movable contacts 2a and 2b are separated from the fixed contacts 8a and 8b, and the fixed contact terminals 9a and 9b are brought into a non-conducting state.

As described above, in a relay having a structure in which the movable contacts 2a, 2b at both ends are brought into contact with the respective fixed contacts 8a, 8b by rotating the movable piece 1 in one direction, the fourth
As shown in the figure, when shocks or vibrations are applied in a direction parallel to the center line of the rotating shaft 3 or parallel to the movable piece 1, these shocks and vibrations are absorbed by the rotating shaft 3, and the relay operates. The movable contacts 2a, 2b hardly displace either in the state or in the return state, and the operation of the relay is not affected. Also, movable piece 1
When an impact or vibration is applied in a direction perpendicular to the movable contacts 2a and 2b, the movable contacts 2a and 2b tend to be displaced in the same direction. Therefore, when the relay is in the reset state, even if one movable contact 2b comes into contact with the fixed contact 8b as shown in FIG. 5, the other movable contact 2a is always separated from the fixed contact 8a, so it is not in the operating state. It will never become. Also, in the operating state of the relay,
As shown in FIG. 3, since both movable contacts 2a and 2b are restrained by bimorphs 4a and 4b, it is difficult for them to separate from the fixed contacts 8a and 8b with which they are in contact. In other words, the relay of the embodiment is in the return state.
In any operating state, it is possible to prevent malfunctions by dealing with external shocks and vibrations. Further, since the movable piece 1 is of a balanced type in weight balanced with respect to the center of the rotating shaft 3, the operation can be stabilized.

As explained above, according to the relay of this invention, by providing movable contacts at both ends and adopting a rotary movable piece whose both ends are balanced in terms of weight,
It has the effect of stabilizing operation, dealing with external vibrations and shocks, and preventing malfunctions.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a relay according to an embodiment of this invention, Fig. 2 is a drive circuit diagram of a bimorph, and Fig. 3 is a plan view of a relay according to an embodiment of this invention.
The figures are operation diagrams for FIG. 1, and FIGS. 4 and 5 are explanatory diagrams for external forces. 1...Movable piece, 2a, 2b...Movable contact, 3...
...rotation axis, 4a, 4b...bimorph, 7a, 7
b...Return spring, 8a, 8b...Fixed contacts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A movable piece provided with movable contacts at both ends and supported by a rotating shaft so that both ends are weight-balanced;
A relay comprising a piezoelectric bimorph that rotates the movable piece in one direction against a return spring to bring the movable contacts at both ends into contact with respective fixed contacts. (2) The relay according to claim 1 of the utility model registration, in which bimorphs are arranged on both sides of the movable piece.