JPS62216116A - Inversion switch - 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 [Field of Industrial Application] The present invention relates to a reversing switch, and more particularly to a switch that automatically removes defective conductors such as dust when they adhere to contact portions.

[Prior Art] A reversing switch is commonly used as a changeover switch. In this switch structure, a click pin is pressed into contact with a roughly V-shaped swinging contact plate, which swings to swing the swinging contact plate, and one of the fixed contacts arranged on both sides of the click pin is always pressed. It is designed to be brought into contact with one side.

[Problems to be solved by the invention] By the way, when the movable contact and the fixed contact of the oscillating contact plate come into contact, if there is a bad conductor such as dust between them, there will be no continuity between the contacts and the circuit will be OFF. . When a normally closed contact is turned on and closed, there are fewer problems because an arc will fly between the contacts and the defective conductor will be cleaned (hereinafter referred to as the wiping function), but in the case of a normally closed contact This problem arises because some of the contacts have a structure that prevents arcing. In that case, it was necessary to oscillate the oscillating contact plate many times to remove the defective conductor, or in the case of bad conductors, to disassemble and clean it. In addition, in the manufacturing process, it is discarded for efficiency reasons, which is a troublesome problem that increases the defective rate.

Therefore, in order to solve this problem, the present invention automatically removes the defective conductor when the click pin swings, or removes the defective conductor by shifting its position from the defective conductor, thereby removing the defective conductor from between the contacts. The purpose of the present invention is to provide a reversing switch that exhibits a wiping function that can be used.

[Means for solving the problem] The reversing switch of the present invention has the following configuration. That is, an elastic swinging contact plate that is approximately V-shaped and has a normally closed contact and a normally closed contact on both ends thereof, fixed contacts provided on both sides corresponding to the contacts, and the swinging contact plate. It consists of an engaging electrode plate that engages with and supports as a fulcrum, and a click pin that swings in sliding contact with the swing contact plate, and as the click pin swings, the swing contact plate swings. In the reversing switch, as the click pin oscillates, the click pin elastically deforms the oscillating contact plate, thereby shifting the contact position between the normally closed contact and the fixed contact, so that the contact portion Characterized by cleaning.

[Operation of the Invention] When energizing is carried out with the normally closed contact and fixed contact of the swinging contact plate in contact, the click pin is in the middle of swinging from the neutral position to the middle of the swinging contact plate.

When the click pin swings further, the swing contact plate is pushed by the click pin, shifting the position of the contact portion from the initial contact position. At this time, if a defective conductor exists between both contact portions, the defective conductor may fall off due to misalignment between the contact portions. Therefore, during a single operation of swinging the click pin, wiping to remove the defective conductor is performed at the same time.

[Embodiment] The present invention will be described in detail based on FIGS. 1 and 6.

First, the outline of this switch will be explained based on FIGS. 3 and 4. Figure 3 shows a large number of reversing switches sw, sw
2. A switch board is shown in which SW3 and SW4 are collectively formed. This figure only shows the arrangement of the fixed electrode and the engaging electrode plate. Swing contact plates and the like are further attached to these. Therefore, as an example, the switch SW1 will be explained. This switch is provided in a box 8 formed on a substrate 7 made of insulating resin. , in box 8,
Opposing fixed contacts 11. lla, and an engaging electrode plate 13 that supports a swinging contact plate 1 (described later) at a fulcrum 2;
Fixed contacts 25 and 26 similarly arranged in parallel with this,
and another circuit consisting of an engaging electrode plate 27, and these two circuits are connected to two reversing switches 5W, which will be described later.
1a and 5Wlb. Engagement electrode plates 13 and 2
7 are located at symmetrical positions across the center, and the fulcrum positions of the respective swing contact plates are arranged symmetrically. Note that the fixed contacts 11 and 26, and the fixed contacts 11a and 25 are terminals of the same polarity. Further, the engaging electrode plates 13 and 27 are also the same terminal.

Figure 4 shows the assembled state of the switch SW, IV- in Figure 3.
It is shown along line IV. A knob 17 is swingably supported by a swing shaft 18 in a box 8 integrally formed on the substrate 7 . Two click mechanisms are provided at the lower end of the knob 17.

In the click mechanism of the switch 5W1a on the ward name side, a click pin 15 is pressed by a spring 16 and fitted into a knob so as to be able to move in and out, and its tip is in sliding contact with the swinging contact plate 1 while pressing it. The side portion of the swing contact plate 1 engages with an engaging electrode plate 13 having a forked tip and is supported as a fulcrum. What is the engaging electrode plate 13? l! It is continuous and integral with the electrode plate 14. Further, the click mechanism of the switch S Wlb on the left side of 1 is similarly composed of a click pin 20 and a spring 21, and the click pin 20 slides on the swinging contact plate 22 while being pressed against it.

The swinging contact plate 22 is connected to the engaging electrode plate 27 (see Fig. 3).
Supported by a fulcrum. The two reversing switches 5W1a and 5W1b formed in this way operate in reverse or in the opposite direction.

Next, a concrete structure of the reversing switch will be explained with reference to FIG. FIG. 1 is a partial cross section of only the switch 5Wla side of the reversing switch, taken along line I-4 in FIG. 4. The oscillating contact plate 1 having a substantially ■-shape is provided with a fulcrum 2 at a position offset to one side from a central bent portion. A movable contact 5.6 is fixed to the end of the arm 3.4 facing towards both ends from this bend. This movable contact 5 is a normally open contact, and 6
is a normally closed contact. Case 7 made of insulating resin
A mounting box 8 is provided, and four parts 9 are provided inside the box 8 to accommodate the swinging contact plate 1 and to enable its swinging. Further, a support groove 10 is provided at the center of the bottom of the recess 9, and the bent portion is supported in this groove. A fixed contact 11 is exposed on the inner wall surface of the box 8 corresponding to the movable contact 6. The fixed contact 11 forms one end of an electrode plate 12 embedded within the insulating case 7. Although not shown, there is also a fixed contact 11a at a position corresponding to the movable contact 5.
(see FIG. 3) are similarly provided.

An engagement electrode plate 13 projects near the center of the swing contact plate 1, engages and supports the side portion of the swing contact plate 1, and uses the engagement portion as a fulcrum 2. Engagement 4 [1ai The tip of the plate 13 is bifurcated, and the swinging contact plate 1 is engaged with the two prongs, and while allowing the swinging contact plate 1 to swing, the swinging contact plate 1 is and the electrode plate 14 to form a circuit. Further, a click pin 15 is in sliding contact with the upper surface of the swing contact plate. The click pin 15 is fitted into the holder 17 so as to be able to move forward and backward while being urged by a spring 16 in a direction to press the swing contact plate l. Furthermore, the holder 17 is swingably supported by a swing shaft 18.

By the way, as shown in FIG. 4, this switch is a reversing switch 5Wla and 5W1 that operate symmetrically.
b are arranged coaxially by a swing shaft 18.

Therefore, these interrelated operations will be outlined in FIGS. 5 and 6. Note that, corresponding to the switch 5W1a, the switch 5W1b also has movable contacts 23 at both ends of the swing plate 22.
．． 24 are formed, and fixed contacts 25 and 26 are provided corresponding to each.

FIG. 5 shows the case where the knob 17 is in a neutral state. In addition,
Switch 5W1a is set to (a), switch 5W1b is set to (b)
). This display method is the same in FIG. 6 as well. When the knob 17 is in the neutral state, each click pin 15.2
0 is at the center bend of each swinging contact plate. However, fulcrum 2
and 22a are biased and symmetrically arranged with respect to the neutral position of each click pin, so that the switch 5W1
In a, the movable contact 5 is a normally open contact, and the contact 6 is a normally closed contact. On the other hand, in switch SWlb, contact 2
4 is a normally closed contact, and 23 is a normally open contact. These contacts are arranged so that the click pin 15.20 swings together with the knob 17 in either direction indicated by the arrow, and a line connecting the swing axis 18 and each fulcrum 2.22a of the engaging electrode plate 13.27 is connected. When exceeded, a reversal occurs.

Therefore, in FIG. 6, by rotating the knob 17 counterclockwise,
This shows the case where the click pins 15 and 20 are rotated to the right in the figure. At this time, in the switch 5W1a, the click pin 15 has already passed the fulcrum 2 of the engagement electrode plate 13, so no reversal occurs and the contact 6 remains closed. on the other hand,
In the switch SWlb, when the click pin 20 passes over the fulcrum which is the engagement portion of the engagement electrode plate 27, the swing contact plate 22 is reversed and the normally open contact 23, which has been open until now, is closed.

At this time, the contact 23 and the fixed contact 25 momentarily generate an arc and come into contact. Therefore, if there is any defective conductor such as dust, it will be wiped away by this arc and removed. However, the switch 5W1a remains closed, and naturally no arc occurs. Further, when each click pin 15, 20 returns from this state to the neutral state shown in FIG. Re-contact with. However, since the fixed contacts 11 and 25 have the same polarity and the normally closed contact 6 and the fixed contact 11 are already closed and conductive, no arc occurs in this case either. This phenomenon is caused by switch 5W1
The same applies to a. Therefore, if there is a defective conductor between the contacts, it will inherently result in poor conduction. However, since the swing contact plates 1 and 22 have elasticity, each of them is elastically deformed, for example, as shown in FIG. 6(a), and the contact position of the contact 6 is shifted to perform wiping. That is, in the illustrated example, as the click pin 15 swings toward the contact 6, the repulsive force of the spring 16 increases and eventually overcomes the elasticity of the swing contact plate 1. At this time, the fact that the arm portion 4 of the swing contact plate 1 is long between the engagement electrode plate 13 and the contact 6 also helps in facilitating wiping.

Next, the wiping operation in a specific embodiment will be explained based on FIGS. 1 and 2. FIG. 1 shows that the contact 6 and the fixed contact 11 are in contact with each other. At this time, the holder 17 integrated with the click pin 15 is in the neutral position indicated by A. Further, a defective conductor 19 such as dust is present between the contact 6 and the fixed contact 11, so that the contact 6 and the fixed contact 11 are not electrically connected. Therefore, the holder 17 is further swung to position B as shown in FIG. Then click pin 1
5 gradually compresses the spring 16 and retreats into the holder 17. However, eventually the click pin 15 stopped retreating,
Conversely, the elasticity of the spring 16 overcomes the elasticity of the arm 4, deforming it and shifting it downward by S. the result,
The defective conductor 19 falls off, or the contact 6 or the defective conductor 19
By being deviated from the contact point, the defective conductor 19 is removed from between the contacts, and the fixed contact 11 is brought into direct contact with the fixed contact 11 for conduction without intervening the defective conductor 19. That is, click pin 15
The contact point 6 performs wiping due to the swinging of the contact point 6.

[Effects of the Invention] The present invention has a wiping function that removes defective conductors by swinging the click pin. Therefore, even on the normally closed contact side, where wiping due to arc cannot be expected, there is no risk of contact failure due to a defective conductor, and the contact can be reliably wiped each time the click pin is operated, and a good conduction state can be maintained.

[Brief explanation of drawings]

1 and 6 show an embodiment of the present invention, FIG. 1 is a sectional view taken along the line I--I in FIG. 4 with the contacts turned on, and FIG. 2 is a sectional view showing the wiping operation state. Fig. 3 is a plan view of the main parts of the switchboard to which the present invention is applied, Fig. 4 is a sectional view of the main parts along the line ■-IV in Fig. 3, and Figs. 5 and 6 are key points for explaining the operating principle. FIG. (Explanation of symbols) 1.22... Swinging contact plate, 2.22a... Fulcrum, 5
・6・23・24...Movable contact, 11・lla・25
・26... Fixed contact, 13, 27... Engagement M, electrode plate 15, 20... Click pin, 17... Holder,
18... Swing axis, 19... Bad conductor.

Claims (1)

[Claims] An elastic swinging contact plate that is approximately V-shaped and has a normally open contact and a normally closed contact at both ends thereof, fixed contacts provided on both sides corresponding to the contacts, and a swinging contact plate that engages with the swinging contact plate. An inversion device comprising an engaging electrode plate that is engaged and supported as a fulcrum, and a click pin that swings in sliding contact with the swing contact plate, and that the swing contact plate swings as the click pin swings. In the switch, as the click pin swings, the click pin elastically deforms the swing contact plate, thereby shifting the contact position between the normally closed contact and the fixed contact, and cleaning the contact portion. A reversing switch characterized by: