JPS62216117A - 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. This switch structure has a click pin pressure contact with a roughly ■-shaped swinging contact plate, which swings to swing the swinging contact plate, and one of the fixed contacts arranged on both sides of the swinging contact plate 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 open contact is turned on and closed, there is less of a problem 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, Some of the contact implants are such that arcing does not occur, and this problem arises. In that case, 1. It is necessary to oscillate the π-moving contact plate many times to remove defective conductors, or in the worst case, 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 Problems] 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 each of the contacts, and the swinging contact. 1. An engaging electrode plate that engages with the plate to support it as a fulcrum and slides on the swing contact plate. A reversing switch comprising a click pin that moves S, and a holder that supports the click pin so that it can be moved in and out and swings together, and that the swing contact plate swings with the swing of the click pin. A protrusion is provided at the tip of the holder so as to protrude at the same level as or slightly more than the tip position when the click pin is retracted farthest into the holder, and as the click pin swings, the protrusion moves toward the swing contact plate. The contact portion is cleaned by shifting the contact position between the normally closed contact and the fixed contact by elastically deforming the contact.

[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 located approximately in the middle of the swinging contact plate and is in the middle of swinging. Then, when the click pin further swings, the relatively rigid protrusion reliably elastically deforms the swing contact plate due to its rigidity. At the same time, the position of the contact portion is shifted 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 displacement of the contact portions of the contacts. I wanted to,
During a single operation of swinging the click pin,
At the same time, wiping is performed to remove defective conductors.

[Example] 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 Pfi and FIGS. 3 to 4. Figure 3 shows a large number of reversing switches SW,
, SW2, SW:l, SW, are not shown. 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 SW will be explained. This switch is provided in a box 8 formed on a substrate 7 made of insulating resin. , a circuit consisting of opposing fixed contacts 11 and lla, and an engaging electrode plate 13 that supports a swinging contact plate 1 at a fulcrum 2, which will be described later, is similarly arranged in parallel with the circuit. Another circuit consisting of fixed contacts 26, 27 and an engaging electrode plate 28 is provided, and these two circuits constitute two reversing switches 5Wla and 5Wlb, which will be described later. The engaging electrode plates 13 and 28 are located at symmetrical positions with the center in between, and the fulcrum positions of the respective swing contact plates are arranged symmetrically. Note that the fixed contacts 1 and 27 and the fixed contacts 11a and 26 are the same terminals, respectively. Further, the engaging electrode plates 13 and 28 are also the same terminal.

FIG. 4 shows the assembled state of the switch SW1 as shown in FIG.
It is shown along line IV. A knob 17 is swingably supported by a swing shaft 19 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 right side of 1, a click pin 15 is pressed by a spring 16 and fitted into the 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. The engaging electrode plate 13 is continuous and integral with the electrode plate 14. Further, the click mechanism of the switch 5W1b on the left side of the figure similarly consists of a click pin 21 and a spring 22, and the swinging contact plate 2
3, the click pin 21 slides while being pressed against it.

The swing contact plate 23 is supported by an engagement electrode plate 28 as a fulcrum. Two switches 5W1a and 5w formed in this way
In 1b, the reversal operation is reversed.

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 II in FIG. 4. The substantially V-shaped swing contact plate 1 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 a recess 9 is provided inside the box 8 to accommodate the swinging contact plate 1 and to enable its swinging. Further, a support groove lO 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.
are similarly provided.

An engagement electrode plate 13 protrudes 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. The engaging electrode plate 13 has a forked tip, and the swinging contact plate 1 is engaged with the forked part, and while allowing the swinging contact plate l to swing, the swinging contact plate l and the electrode are connected. It is connected to the board 14 to form a circuit. Further, a click pin 15 is in sliding contact with the upper surface of the swing contact plate 1. The click pin 15 is fitted into the holder 17 so as to be able to move forward and backward while being biased in the direction of pressing the five-motion contact plate 1 by a spring 16. A protrusion 18 is integrally provided in the entrance/exit direction.

However, the method of forming the protruding part 18 is arbitrary, and a separate part may be added later, and in that case, it may be made of a material with good sliding properties. The protruding portion 18 is made to protrude at the same level or slightly more than the tip position when the click pin 15 is retracted the most into the holder 17. Further, the holder 17 is swingably supported by a swing shaft 19.

By the way, as shown in FIG. 4, this switch is a reversing switch 5Wla and SW which operate symmetrically.
lb are arranged coaxially by a swing shaft 19. Therefore, these interrelated operations will be summarized in the P3S diagram and FIG. 6. In addition, corresponding to the switch 5W1a, the switch S WIL+ is also provided with movable contacts 24.25 at both ends of the swing plate 23, fixed contacts 26.27 corresponding to each, and a protrusion. 29 is also provided in the same manner as the protrusion 18.

FIG. 5 shows the case where the holder 17 is in a neutral state. Note that the switch 5W1a is shown in (a), and the switch 5WIL+ is shown in (b). This display method is the same for diagram 956 as well. When the holder 17 is in the neutral position, each click pin 15.21 is in the central bend of each oscillating contact plate. However, since the positions of the fulcrums 2 and 23a are biased and symmetrically arranged with respect to the neutral position of each click pin, in the switch 5W1a, the movable contact 5 is a normally open contact, and the contact 6 is a normally open contact.
becomes a normally closed contact. On the other hand, in the switch 5W1b, the contact 25 is a normally closed contact, and the contact 24 is a normally open contact.

These contacts are arranged so that the click pins 15.21 are connected to the holder 17.
The reversal occurs when it swings in either direction indicated by the arrow and crosses a line connecting the swing axis 19 and each fulcrum 2.23a of the engaging electrode plate 13.28. In addition, in the neutral position, since the click pins 15.21 extend outward from the holder 17, neither of the protrusions 18 and 29 is in contact with the swing contact plates 1 and 23.

Therefore, FIG. 6 shows a case where the holder 17 is rotated counterclockwise and the click pin 15.21 is 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 5W1b, when the click pin 21 passes over the fulcrum 22a, which is the engaging portion of the engaging electrode plate 28, the swinging contact plate 23 is reversed, and the normally closed contact 24, which has been open until now, is closed. At this time, the contact 24 and the fixed contact 26 momentarily generate an arc and come into contact with each other. Therefore, if there is any defective conductor such as dust, it will be wiped and removed by this arc. However, the switch 5Wla remains closed, and naturally no arc occurs.

Also, from this state, each click pin 15.21 again
When returning to the neutral state shown in FIG. 5, the normally closed contact 6 remains in contact with the fixed contact 11, or one of the normally closed contacts 25 is reversed and contacts the fixed contact 27 again. However, fixed contacts 11 and 26 have the same polarity, and normally closed contact 6 and fixed contact 1
1 is closed and conductive. Therefore, no arc occurs in this case either. This phenomenon also occurs in the switch 5W1a. Therefore, if there is a bad conductor between the contacts,
This would normally result in poor conduction. However, the swing contact plates 1 and 23
Since these have elasticity, each of them is elastically deformed, for example, as shown in FIG. 6(a), and the contact position of the contact point 6 is shifted to perform wiping. That is, in the illustrated example, as the click pin 15 swings toward the contact 6, the spring 1
6 is compressed and pushed into the holder 17. However, when the tip of the click pin 15 moves back further than the tip of the protrusion 18, the tip of the protrusion 18 comes into contact with the swing contact plate 1. Since the protrusion 18 has more rigidity than the spring 16, it eventually overcomes the elasticity of the swing contact plate 1 and deforms it. 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 a state in which the contact 6 and the fixed contact 11 are in contact. At this time, the click pin 15 is in the most extended state, and the click pin 15
The holder 17, which is integral with the holder 17, is in the neutral position indicated by A. Furthermore, there is a defective conductor 2 such as dust between the contact 6 and the fixed contact 11.
0 is present, and the contact 6 and the fixed contact 11 are not electrically connected. Then, the holder 17 is further swung to position B and tilted. Then, the spring 16 is compressed and the click pin 15 is pushed into the holder F. However, when the tip of the click pin 15 moves back further than the tip of the protrusion 18, the tip of the protrusion 18 comes into contact with the swing contact plate 1. Since the protrusion 18 has more rigidity than the spring 16, it eventually overcomes the elasticity of the swing contact plate 1 and deforms it. As a result, contact 6 is shifted downward by S.

As a result, the defective conductor 20 falls off or the contact 6 shifts from the defective conductor 20, thereby removing the defective conductor 20 from between the contacts and directly contacting the fixed contact 11 without the defective conductor 20 intervening. Conduct. That is, as the click pin 15 swings, the protrusion 18 wipes the contact portion of the contact 6. Note that the function of the protruding portion 29 is also similar. According to this embodiment, since the protrusions 18 and 29 are formed integrally with the holder 17, they have the same rigidity as the holder 17 and are less likely to deform than the springs 16 and 22 of the Kurilag mechanism, ensuring the elasticity of the swinging contact plate. It can be transformed. Moreover, it is easy to manufacture.

[Effects of the Invention] The present invention has a wiping function for removing defective conductors by swinging the click pin. Therefore, even on the normally closed contact side where wiping due to arcing cannot be expected, there is no risk of contact failure due to a bad conductor, and the relatively rigid protrusion reliably deforms the oscillating contact plate elastically every time the click pin is operated. By doing so, the contact portion of the contact can be wiped and a good conduction state can be maintained.

[Brief explanation of drawings]

1 and 6 show an embodiment of the present invention, in which FIG. 1 shows a state in which the contacts are ONt, and a sectional view taken along the line I-I in FIG.
Figure 2 is a sectional view showing the wiping operation state. Fig. 3 is a plan view of the main parts of a switch boat to which the present invention is applied, Fig. 4 is a sectional view of the main parts along the line IV-IV in Fig. 3, and Figs. 5 and 6 are key points for explaining the principle of operation. FIG. (Explanation of symbols) 1.23... Swinging contact plate, 2.23a... Fulcrum, 5
・6・24・25...Movable contact, 11・lla・26
・27... Fixed contact, 13.28... Engaging electrode plate,
15・21...Click pin, 17...Holta, 1
8... Swing shaft, 18, 29... Protrusion, 20...
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 each of the contacts, and the swinging contact plate. The click is comprised of an engaging electrode plate that engages and supports as a fulcrum, a click pin that slides on the swing contact plate and swings, and a holder that supports the click pin so that it can move in and out and swings together. In a reversing switch in which the swinging contact plate swings as the pin swings, the tip of the holder is arranged so that the tip protrudes at the same level as or slightly more than the tip position when the click pin is retracted farthest into the holder. A protruding part is provided in the part, and as the click pin swings, the protruding part elastically deforms the swinging contact plate, thereby shifting the contact position between the normally closed contact and the fixed contact, and thereby making contact. A reversing switch characterized by cleaning parts.