JPS61185830A - Electric contact - 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 of the Invention] The present invention relates to electrical contacts used in small electromagnetic contactors, electromagnetic relays, and the like.

[Technical Background of the Invention J The configuration of a conventionally available electromagnetic contactor is shown in FIG. In the figure, 1 is a frame, 2 is an electromagnet fixed to this frame 1, 3 is a plunger, 4 is a slider connected to this plunger 3, 5 is a fixed contact fixed to frame 1, and 6 is this A fixed contact provided on the fixed contact 5; 7 a movable contact disposed in the support hole 4a of the mover 4; 8 a movable contact provided in the movable contact 7; 9 a support hole of the mover 4. 4a is a spring provided to bias the movable contact 7 in the direction of the fixed contact 6. As shown in FIGS. 9 and 10, the movable contact 8 has a conical or arc shape. In the electromagnetic contactor described above, when the electromagnet 2 is energized, the plunger 3 and therefore the movable element 4 are retracted, thereby causing the movable contact 8 of the movable contactor 7 to move as shown in FIG.

It comes into contact with the fixed contact 6 as shown in FIG. In this case, the movable contact 7 is relatively raised from the bottom of the support hole 4a, so the movable contact 8 comes into point contact with the fixed contact 6 due to the biasing force of the spring 9.

[Problems with background technology]

By the way, electrical contacts used in such electromagnetic contactors, electromagnetic relays, etc. have problems such as increased contact resistance due to insulating coatings due to dust intrusion and corrosion, and this has traditionally been cited as a problem to be solved. It is desirable to maintain high contact reliability over a long period of time. When looking at the above-mentioned conventional electrical contacts in consideration of this point, since the movable contact 8 has a conical or arc shape, even if an insulating film is formed on the fixed contact 6 and the movable contact 8, the tip angle of the movable contact 8 However, in this case, the breakdown of the insulating film is limited to a very narrow area, and it cannot be said to be completely reliable. The actual situation is that the portion where the tip corner of the movable contact 8 comes into contact wears into a concave shape, and there is a risk that foreign matter may accumulate in that portion, resulting in poor conduction, and the contact reliability is compromised.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to ensure that the insulating coating can be reliably removed, foreign substances can be removed reliably, and that the contact reliability is generally high over a long period of time. It is located on the vine that provides electrical contacts that can be obtained.

[Summary of the Invention] The present invention provides a plurality of ridges on each of a fixed contact and a movable contact, and when the movable contact contacts the fixed contact, the ridge on the movable contact slides with respect to the ridge on the fixed contact. In addition, the structure is such that point contact is made at a plurality of locations, thereby improving the destructive effect on the insulating coating and the removing effect against foreign substances.

[Embodiment of the Invention] A first embodiment of the invention will be described below with reference to FIGS. 1 to 6. Figures 1 and 2 include Figures 9 and 10.
The same parts as those in the figures are given the same reference numerals, so 4 is a moving element, 5 is a fixed contact, 7 is a movable contact, and 9 is a spring. As shown in FIG. 4, the support hole 11 in the mover 4 is formed so that its bottom portion 11a is inclined.

12 is a circular fixed contact provided on the fixed contact 5;
3 is a circular movable contact provided on the movable contactor 7, and each of these contacts is shown in FIG. 5(a).

As shown in (b), (c) and (d), four protrusions 14
, and each protrusion 14 has a fan shape when viewed from above, and has a cross-sectional shape (111r along line C-C in FIG. 5(a)).
! fi shape) has a circular arc shape as shown in FIG. 5(C). A plurality of ridges 14a (four in this case) are formed by the protrusion 14, and the ridges 14a are cross-shaped as a whole when viewed in plan. Thus, the movable contact 13 is different from the fixed contact 12 as shown in FIG. 6(a).
), they are fixed to the movable contact 7 with a rotational angle of 45 degrees, that is, the fixed contact 12 and the movable contact 13 are arranged opposite to each other so that their ridges 14a intersect. Also, in this case, the movable contact 7 is connected to the support hole 11 of the mover 4.
Since the bottom portion 11a of the movable contact 13 is inclined as shown in FIG. 2, the movable contact 13 thereof is also inclined. Roughly, the positional relationship between the movable contact 13 and the fixed contact 12 is as shown in FIG. Left direction) It is set to tilt the chair.

Now, to explain the operation of the above configuration, we will now explain the effect of the electromagnet 2.
When the mover 4 is drawn downward by being energized, the movable contact 13 is also moved downward and the fixed contact 1
Contact 2. In this case, since the movable element 4 further moves slightly downward after the contact, the movable contact 7 is relatively lifted up from the bottom 11a of the support hole 11, so that the movable contact 13 is in a position where the spring 9 is lower than the fixed contact 12. Contact is made by biasing force. Here, to explain in detail the operation at the time of contact, FIGS. 6(a), (b), and (C) respectively show the initial state, intermediate state, and final state at the time of contact. As shown in figure (a), in the initial state of contact,
Since the movable contact 13 is inclined, this movable contact 1
3 makes contact slightly to the left of the fixed contact 12. Thereafter, the movable contact 13 in the inclined state shifts to the horizontal state under the biasing force of the spring 9, so that the movable contact 13 is displaced to the right. Then, as shown in FIG. 6(b), both contacts 12.
13 wraps, the movable contact 13 is finally positioned slightly to the right of the fixed contact 12, as shown in FIG. 6(C). As a result of such movement of the movable contact 13, the ridge 14a of the movable contact 13 (see FIG.
a>, (b).

(shown by a two-dot chain line in (C)) slides while being in contact with the ridge portion 14a (shown by a solid line or a dotted line) of the fixed contact 12. Finally, the ridge 14 of each contact 12.13
a, 14a as shown in FIG. 6(C), point P1. P2
, P3.

According to this embodiment, the fixed contact 12 and the movable contact 13 are provided with linear ridges 14a, 14a by the projections 14, respectively.
The movable contact 13 is provided in an inclined manner so that when the movable contact 13 makes contact with the fixed contact 12, the movable contact 13
The ridge 14a at the fixed contact 12 is the ridge 14a at the fixed contact 12.
Since the contacts 12 and 13 are designed to slide against each other, even if an insulating film forms on each contact point 12, 13, the sliding action can reliably destroy the insulating film, improving contact performance and also making it possible to reliably remove foreign objects. . In addition, the movable contact 13 is arranged to face the fixed contact 12 so that the ridges 14a, 14a intersect with each other, and when the two contacts 12 and 13 are finally in contact, the ridges 14a, 14a are arranged at multiple locations (3 Since point contact is made at 2 points), unlike the conventional case where point contact is made at one point, even if dust adheres to one part, other points of contact will be fine. maintain close contact. This three-point contact allows a stable contact state to be maintained at all times, and overall high contact reliability can be maintained over a long period of time.

Moreover, in this case, a space substantially closed by the ridge portion 14a is formed by the three-point contact, so these contact points 12.
Even if dust is floating in the portion 13, it is possible to prevent the dust from entering inside the ridge 14a as much as possible, and therefore, the adhesion of dust itself can be effectively prevented.

In the above embodiment, the ridge portion 14a is formed in a cross shape extending radially from the center of each contact point 12°13, but for example, as shown in FIGS. As shown in (C), the ridge 16a of the fixed contact 15 may form a cross shape eccentric from the center, and in this case, a four-point contact state can be obtained as shown at points P4 to P7, Furthermore, the ridge portion is not limited to a cross shape, but may be a Y-shaped radial shape, or may be a plurality of approximately parallel ridge portions. Any configuration may be used as long as the movable contact 13 is made to make point contact at a certain point.Furthermore, the configuration for sliding the movable contact 13 is not limited to the above-mentioned embodiment in which the movable contact 13 is inclined; for example, the spring 9 may be composed of a torsion coil spring. It may be configured to utilize the torsional force accompanying the compression.Also, the vertical cross-sectional shape of the protrusion is not limited to the above embodiment, and may be V-shaped, for example.

In addition, the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist.

[Effects of the Invention] As is clear from the above description, in the present invention, since the movable contact is made to slide, it is possible to reliably destroy the insulating coating, and also to ensure the removal of foreign matter. Since point contact is made at the contact points, good contact can be achieved even if there is dust, etc., and it is also possible to prevent dust from adhering as much as possible, which greatly improves contact reliability as a whole. It has the excellent effect of being able to maintain high contact reliability over a long period of time.

[Brief explanation of the drawing]

1 to 6 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional front view of the electric contact portion of the electromagnetic contactor, FIG. 2 is a longitudinal sectional side view thereof, and FIG. 4 is a partial side view of the mover, and in FIGS. 5(a) to (d), (a) is a plan view of the fixed contact (movable contact), and (b) is a front view. , (C) is a longitudinal sectional view taken along the arrow C-C line in (a), (d) is a perspective view, and in Figs. 6 (a) to (C), (a) is a plane showing clear water in the initial contact state. FIG. 5B is a plan view showing an intermediate state, and FIG. 2C is a plan view showing a final state. 7(a) to 7(C) show a second embodiment of the present invention. FIGS. 6(a) to 10 are views corresponding to FIGS. 1 and 2, respectively, and FIG. 11 is a longitudinal cross-sectional side view in a contact state. In the figure, 4 is a moving element, 5 is a fixed contact, 7 is a movable contact,
9 is a spring, 12 is a fixed contact, 13 is a movable contact, 14 is a protrusion, 14a is a ridge, 15 is a fixed contact, and 16a is a ridge. Figure 11 Figure 2 Figure 3 Figure 4 Section 5 (b) (C) (d) 'IA G Flash (a) (1) ) (
C) Male 7I211 $8 Diagram

Claims (1)

[Claims] 1. A fixed contact and a movable contact that is biased by a spring force and comes into contact with the fixed contact, and the fixed contact and the movable contact are provided with a plurality of linear ridges formed by protrusions, and An electrical contact characterized in that when the movable contact makes contact, the ridge of the movable contact slides on the ridge of the fixed contact and intersects at a plurality of locations to make point contact.