JPS6271138A - Contact switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a contact switching device commonly used in relays, switches, contactors, etc.

[Background technology]

In general, contact switching devices are required to prevent contact welding due to arcs generated between contacts when they are turned on and off. For this reason, various contact materials that can improve arc resistance have been studied. These materials are basically based on silver (8g) and dispersed with high melting point tungsten (-), 5nOt+ InzOi, [1iOs, etc.), and the upper limit of the melting point provides a welding prevention effect. It is something. However, at the same time, there was a drawback that contact resistance increased and temperature rise increased.

In addition, various types of devices such as hinge-type relays that use the deflection of a temporary spring to relatively slide (wipe) a movable contact and a fixed contact are being considered to mechanically improve welding resistance. (For example, special 1: #1 1972-14
No. 51). Does this thing use wiping action even if an arc occurs between the contacts? It can be expected to release the 8 contacts, and its sliding action can stabilize the contact resistance of the contacts and reduce the noise caused by contact collisions. However, since the contact surface is roughened by the arc, there is a drawback that the wiping operation increases contact wear.

On the other hand, in contrast to these, in the case of a device equipped with a high melting point arc contact and a low resistance conductive contact as in Japanese Patent Application No. 60-12832, the arc contact is inserted before the conductive contact.
If the contact is configured to open later, the arc occurs only at the arc contact, which improves the welding resistance of the high-melting point material and the stability of the contact resistance of the conductive contact due to the low-resistance material that does not generate arcs. I can do it.

However, since the contactor supporting the arc contact and the conductive contact is a movable member, this type has a disadvantage that the structure is complicated, the number of parts increases, and assembly becomes complicated.

[Purpose of the invention]

An object of the present invention is to provide a contact switching device that has an arc contact and a four-current contact, and has a simple structure, a small number of parts, and is easy to assemble.

(Disclosure of the Invention) The present invention provides a contact spring in which a plate member is bifurcated to form a pair of branch pieces that can be bent in the plate thickness direction, and a base portion of the branch piece of the contact spring. a fixing part for fixing the pair of branch pieces, a driving means for bending each of the branch pieces by pressing the tips of the pair of branch pieces in the direction of their bases, and a side of one of the branch pieces that protrudes due to the bending. a high-melting-point arc contact fixed to the surface of the arc contact; a high-melting-point first fixed contact disposed opposite to the arc contact and in contact with the arc contact due to the bending motion of the branch piece; and the other of the branch pieces. A low-resistance electrical contact is fixed to the surface of the protruding side by the curved shape, and a low-resistance electrical contact is arranged opposite to the conductive contact and comes into contact with the conductive contact by the curved movement of the branch piece. 2 fixed contacts, and is characterized in that by driving the driving means, the arc contact comes into contact with the first fixed contact before the conductive contact.

According to this invention, an arc contact and a conductive contact are separately provided in a pair of branch pieces of a contact spring, and the drive means bends the branch pieces, and the arc contact is closed before the conductive contact. Therefore, when the contacts are closed, the arc contacts are closed before the conductive contacts, and when the contacts are opened, the arc contacts are opened later. Therefore, welding resistance and stability of contact resistance can be ensured. Further, since the arc contact and the conductive contact are provided on the branch piece of the contact spring, the number of parts is reduced and assembly is simplified.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3. That is, this contact opening/closing device includes a contact spring 3 in which a plate-shaped body is bifurcated into a pair of branch pieces 1.2 that can be bent in the thickness direction, and a contact spring 3.
a fixing part 5 for fixing the root part 4 of the branch piece 1.2;
Said pair of branch pieces 1. a driving means 6 for elastically bending each branch piece 1.2 by pressing the tip of the branch piece 1.2 in the direction of its base 4; a high melting point arc contact 7 fixed to the arc contact 7; a high melting point first fixed contact 8 which is disposed opposite to the arc contact 7 and comes into contact with the arc contact 7 by the bending motion of the branch piece 1.2; Said branch piece 1. 2
On the other hand, a low-resistance conductive contact 9 is fixed to the surface of the protruding side due to its curvature, and the conductive contact 9 is disposed opposite to this conductive contact 9, and the conductive contact 9 comes into contact with the curved movement of the branch piece 1.2. and a low resistance second fixed contact 10, and is configured such that by driving the driving means 6, the arc contact 7 contacts the first fixed contact 8 before the yL conductive contact. It is characterized by

Branch piece 1 of the contact spring 3. 2 are pre-bent so as to curve in opposite directions. Also, branch piece 1.
The length of the branch piece 1 having the arc contact 7 is longer (2), so that the tip of the branch piece l is closer to the driving means 6 side. This is omitted. The driving means 9 is an example of a card of an electromagnetic device which will be described later. The arc contact 7 and the first fixed contact 8 are made of a high melting point material such as Age or HegWC. Conductive. The contact 9 and the second fixed contact 10 are made of a low resistance material such as Heg, AgCd0 or the like.

FIG. 1 shows the contacts in the open state, and FIGS. 2 and 3 show the contacts in the closed state. That is, in the operation from FIG. 1 to FIG. 3, from the open state shown in FIG.゛ When pressed to the side, the branch piece 2 bends and the surface of its arc contact 7 moves in the advancing direction and comes into contact with the first fixed contact 8 facing the arc contact 7, resulting in the state shown in Fig. 2. .

When the drive means 6 is further operated from this state, the drive means 6 presses the tip of the branch piece 2, the surface of the conductive contact 9 of the branch piece 2 is bent in the direction of advancement, and the maximum displacement position of the branch piece 2 is reached. It contacts the second fixed contact lO just before, and at the maximum displacement position it becomes as shown in Fig. 3. Note that during this operation, since the arc contact 7 and the first fixed contact 8 are already in contact with each other, the branch piece l moves so that both sides of the arc contact 7 are largely bent.

On the other hand, the contact is opened by releasing the pressure on the contact spring 3 by the driving means 6 and moving the driving means 6 in the opposite direction.
Due to the restoring action of the contact spring 3, the conductive contact 9 first separates from the second fixed contact 10, resulting in the state shown in FIG. 2, and then the arc contact 7 separates from the first fixed contact 8, resulting in the state shown in FIG. state.

Because of this structure, the contact switching device of this embodiment has the arc contact 7 inserted first and the conductive contact 9 disconnected later.
It is possible to prevent arcing from occurring during contact, and thus ensure welding resistance and stability of contact resistance. Also, the branch piece l of the contact spring 3.

Since the arc contact 7 and the four-electric contact 9 are fixed to the contact point 2, the number of parts can be reduced and assembly can be simplified by not providing a contact spring for each contact.

In addition, since the arc contact 7 and the flexible contact 9 are provided in opposite directions, even if consumable powder generated by the arc at the arc contact 7 is scattered, it is difficult to adhere to the surface of the conductive contact 9, which reduces the contact resistance. will not deteriorate.

FIG. 4 shows a relay to which this contact opening/closing device is applied. In FIG. 4, 15 is a device stand, 16 is a case, and 17 is a driving means 6. 1! The magnet device 18 is a contact stand. In the electromagnet device 17, 20 is a coil frame, 21 is a coil, 22 is a yoke portion, 23 is a coil terminal, 24 is a movable iron piece whose lower end is pivoted to the tip of the yoke portion 22, and 25 is a return spring for the movable iron piece 24. When the coil 21 is energized, the upper end of the movable iron piece 24 passes through the coil frame 20.
6 and returns to its original state by the return spring 25 when the current is cut off. This electromagnet device 17 is installed inside the device stand 15, and at that time, the coil terminal 2 is inserted into the slit 27 of the device stand 15.
3 penetrates. A contact base 18 is arranged on the upper surface of the electromagnetic device 17, and the fixing portion 5 and the terminal plate 13 are fixed to a slit 28 of the contact base 18, and each tip thereof protrudes to the outside and passes through the slit 27. The first fixed contact 8 and the second fixed contact IO are fixed to the terminal plate 13. In addition, a rod-shaped card 29 is slidably arranged on the contact base 18 , one end of which extends from the side of the contact base 18 toward the electromagnet device tlT, and the engagement recess 30 at the tip is located above the movable iron piece 24 . The other end is engaged with the rotating end of the contact block 18.
is guided by a guide portion 31 . Further, a driving pressing part 32 is formed in the middle part of the card 29, and the driving pressing part 32
is the branch piece 1.2 of the contact spring 3 fixed to the fixed part 5.
Opposite the tip of. Therefore, when the movable iron piece 24 operates, the card 29 moves in its longitudinal direction, and the drive pressing part 32 of the card 29 pushes the tip of the branch piece 1.2 into the root part 4.
Press to the side. In addition, 33 is a mounting hole of the device stand [5, 34 is a caulking projection for fixing the base part 4 of the contact spring 3 to the fixing part 5, and 35 is the hole.

In another embodiment, the branching pieces 1.2 are curved in opposite directions, but may also be curved in the same direction.

Further, as the arc contact 7 is inserted first and broken later, in the above embodiment, the length of the branch piece l having the arc contact 7 is longer than that of the branch piece 2, but the length of the branch piece 1.2 is the same. In this case, the distance between the arc contact 7 and the first fixed contact 8 may be smaller than the distance between the R electric contact 9 and the second fixed contact 10, or the lengths of the branch pieces 1.2 may be made the same. And branch piece l.

A step may be formed on the pressing surface of the driving means 6 that presses the tip of the branch piece 2 so that the pressing surface that presses the tip side of the branch piece 1 having the arc contact 7 comes closer to each other.

An extension part is formed at the root part 4 of the contact spring 3, and a spring part is formed by bending the extension part, and when this spring part is biased after the bending operation of the branch piece 1.2, a conductive contact is formed. Since a wiping operation can be obtained in the contact state between the contact point 9 and the second fixed contact lO, the contact resistance can be further stabilized. In this case, the condition is that the spring force that causes the root portion 4 to bend is greater than the spring force that causes the branch piece 1.2 to bend. Further, the spring portion may be provided only at the base of the branch piece 2 having the conductive contact 9.

In yet another embodiment, the conductive contact 9 and the second fixed contact 1O may be arranged to face each other in an inclined state so that a wiping operation is performed when they make contact.

This can be done by changing the mounting position of the conductive contact 9 or by arranging the second fixed contact 10 at an angle.

(Effects of the Invention) According to the present invention, an arc contact and a conductive contact are separately provided in a pair of branch pieces of a contact spring, and the branch pieces are bent by a driving means, and the arc contact is placed before the conductive contact. Since the closing operation is made, the arc contact is closed before the conductive contact when the contact is closed, and the arc contact is opened later when the contact is opened. Therefore, welding resistance and stability of contact resistance can be ensured. Furthermore, since the arc contact and the conductive contact are provided on the branch piece of the contact spring, the number of parts is reduced and assembly is simplified.

[Brief explanation of drawings]

FIG. 1 is a side view of one embodiment of the present invention in a state where the contacts are open, FIG. 2 is a side view with the arc contact closed, and FIG.
The figure is a side view of a state in which a conductive contact is inserted, and FIG. 4 is an exploded perspective view of a relay to which this contact opening/closing device is applied. DESCRIPTION OF SYMBOLS 1, 2... Branch piece, 3... Contact spring, 4... Root part, 5... Fixing part, 6... Drive means, 7... Arc contact, 8... First fixed contact, 9... conductive contact, lO... second fixed contact

Claims (7)

[Claims] (1) A contact spring in which a plate-like body is bifurcated to form a pair of branch pieces that can be bent in the plate thickness direction, and a fixing part that fixes the base of the branch pieces of this contact spring. , a drive means for bending each of the branch pieces by pressing the tips of the pair of branch pieces in the direction of their bases; an arc contact with a high melting point, a first fixed contact with a high melting point that is disposed opposite to the arc contact and comes into contact with the arc contact by the bending motion of the branch piece; a low-resistance conductive contact fixed to the surface of the branching piece, and a low-resistance second fixed contact disposed opposite to the conductive contact and brought into contact with the conductive contact by the bending motion of the branch piece; By driving the driving means, the arc contact is brought into contact with the first contact before the conductive contact.
A contact switching device characterized in that it is configured to come into contact with a fixed contact. (2) The contact opening/closing device according to claim (1), wherein the pair of branch pieces are curved in opposite directions. (3) The branch piece having the arc contact is formed longer than the one having the conductive contact, and the arc contact becomes the first fixed contact before the conductive contact due to the operation of the driving means. A contact opening/closing device according to claim (1) or (2) that makes contact. (4) The distance between the first fixed contact and the arc contact is arranged to be smaller than the distance between the second fixed contact and the conductive contact, and the operation of the driving means causes the arc contact to become a conductive contact. The contact opening/closing device according to claim 1 or 2, wherein the contact opening/closing device contacts the first fixed contact earlier than the first fixed contact. (5) The root portion of the contact spring has a spring portion so that the tip of the branch piece can move toward and away from the root portion.
) The contact opening/closing device described in section 2. (6) Claim (1) or (2), wherein the conductive contact and the second fixed contact face each other at an angle.
Contact opening/closing device as described in section. (7) Of the surfaces of the driving means that press the branch piece,
The surface of the branch piece having the arc contact is formed closer to the tip of the branch piece than the face of the branch piece having the conductive contact, and the operation of the driving means causes the arc contact to move ahead of the conductive contact. A contact opening/closing device according to claim 1 or 2, wherein the contact opening/closing device contacts the first fixed contact.