JPH0126018Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small switch, and more particularly to a small switch in which a movable contact piece seesaws using a receiving piece as a fulcrum when it comes into contact with a fixed contact piece, and at the same time slides into contact.

The main switch contact mechanisms that have been put into practical use include a seesaw mechanism and a slide mechanism. First, the seesaw mechanism has a structure in which the movable contact piece is brought into contact with the fixed contact piece by colliding with it, so it is structurally characterized by the fact that it is easy to generate a large contact pressure. The advantage of using a material that does not easily form a hard oxide is that it allows a switch that can conduct a large current to flow. However, no matter how high the contact pressure can be, if a material such as copper that easily forms a hard oxide is used, the contact resistance will be high due to the hard oxide, and the switch contact may generate heat and burn out. There is. On the other hand, when the slide switching mechanism is in a state where appropriate contact pressure can be obtained, due to sliding contact,
It has the effect of removing oxides from the contact contact surface, thereby maintaining good contact contact. However, the slow movement of the movable contact piece causes the arc to be drawn for a long time, which tends to cause the contact piece to burn out. For example, the switching speed of the switch becomes slower, which not only exacerbates the above problems but also increases the rate of wear of the contact surfaces.

The present invention has been developed in view of the above-mentioned conventional circumstances, and therefore, the purpose of the present invention is to provide good contact contact at low cost by skillfully combining only the advantages of the seesaw mechanism and slide mechanism. The objective is to provide a new small switch that can obtain the following.

Another object of the present invention is to obtain good contact contact characteristics by using inexpensive copper material instead of expensive silver material as a contact material by effectively performing a cleaning action on the contact contact surface. Our objective is to provide a new small switch that enables

The above object of the present invention is to provide a switch in which a movable contact piece placed on a receiving piece is tilted left and right to open and close by operating a handle, in which the tip of a push rod is engaged with the upper surface of the movable contact piece via a spring. Provide a matching recess or a plurality of protrusions, and form the tip thereof in a V or U shape, or form an uneven portion on the lower surface of the tip in a direction substantially perpendicular to the moving direction of the movable contact piece, As the push rod interlocked with the handle moves left and right, the movable contact piece moves left and right along with the push rod, see-saws and selectively contacts the left and right fixed contact pieces, and at the same time The tip of the piece forcibly cleans the upper surface of the fixed contact, and when the movable contact comes into contact with the fixed contact and stops, the tip of the movable contact has a predetermined length. This is achieved by a small switch characterized in that it protrudes from the outside of the fixed contact piece.

Next, preferred embodiments of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of a conventional switch employing a seesaw mechanism. In the figure, a movable contact piece 3 on a receiving piece 2 fixedly installed inside the switch body 1
follows the tilting of the handle 4, seesaws around the receiving piece 2 as a fulcrum, and selectively contacts fixed contact pieces 5 provided on both sides of the receiving piece 2 to change the switch.

2, 3, and 4 are a sectional view, a perspective view of a main part, and an enlarged perspective view of a main part of a switching mechanism, showing one embodiment of a small switch according to the present invention. In the figure, reference numeral 11 indicates a switch body, and a movable contact piece receiving piece 12 and a fixed contact piece 13 are fixed to the bottom of the switch body. 12' and 13' indicate terminals continuous to the receiving piece 12 and the fixed contact piece 13, respectively. The upper part of the main body 11 is covered with a cover 16 having a flange 14 and an elastic piece 15 for attaching the switch in the switch operation direction. A handle 19 having a push rod 18 provided at its lower part via a spring 17 is pivotally supported on the cover 16 so as to be swingable about a support shaft 20 .

A movable contact piece 21 is placed on the upper part of the receiving piece 12, and the push rod 18 described above is attached to the portion of the contact piece 21 formed by the two protrusions 22 provided on the upper surface of the movable contact piece. The tips are engaged. Special contact piece 2
Both ends of the movable contact piece 21 are formed into a V-shape 21a in order to effectively carry out the cleaning action described below, and the side surface of the movable contact piece 21 is provided with a rising part (tongue piece) 12a of the receiving piece 12. Together with this, a lug 23 is formed that restricts the movement of the movable contact piece 21 in the longitudinal direction, that is, in the operating direction of the switch. V-shaped tip 2
1a may be a U-shaped tip. Incidentally, it is also possible to adopt a configuration in which a concavo-convex portion (notch) is formed on the lower surface of the V-shaped tip portion 21a in a direction substantially perpendicular to the moving direction of the movable contact piece. Tongue piece 12a of receiving piece 12
It also has the function of regulating the movement of the movable contact piece 21 in a direction perpendicular to the switch operation direction. Further, as shown in FIG. 2, the movable contact piece 21 has a dimensional relationship between the length A of the movable contact piece 21 and the length B between the outer surfaces of the left and right fixed contact pieces 13 such that B>A. When the movable contact piece contacts the fixed contact piece (stop position), the V-shaped tip 21a of the movable contact piece extends from the outside of the fixed contact piece by at least the notch length in which the V-shape is formed. It is formed to project (protrude). Furthermore, as shown in FIG. 4a, it goes without saying that the relationship C>D exists between the distance C between the inner sides of the ears 23 of the contact piece 21 and the plate thickness D of the receiving piece 12. do not have.

Next, the operation of the embodiment of the present invention described above will be explained. When the handle 19 is tilted little by little, the movable contact piece 21 is displaced while sliding little by little on the receiving piece 12, and when the push rod 18 comes almost above the receiving piece 12, the movable contact piece 21 is moved to the position where it is now. It suddenly separates from the fixed contact piece that it had been in contact with until then, and then comes into contact with the fixed contact piece on the opposite side. When the handle 19 is pushed down a little further, the movable contact piece 2
1 further slides on the receiving piece in the opposite direction to the tilting side of the handle and is displaced. At that time, the V-shaped tip 21a of the movable contact piece 21 scrapes off the oxidized film and burnt surface of the contact part caused by the arc generated between the fixed contact pieces 13 when the switch is opened and closed, as shown in FIG. 4b. , has a so-called cleaning effect. That is, the V-shaped tip 21a scrapes off oxides and the like on the contact surface using its defects, and collects the oxides and the like at its defects and causes them to fall to the outside of the fixed contact piece 13. 24 indicates powder such as oxides which are thus dropped.

FIG. 5 shows still another embodiment of the present invention, and is a partial perspective view showing a modification of the movable contact piece. In the embodiment shown in FIGS. 2 to 4, the distal end 21a of the movable contact piece 21 has a V-shaped recess, but in this embodiment, the V-shaped convex part is formed. It is characterized by the fact that it is formed. Of course, a U-shape may be used instead of a V-shape.

FIG. 6 is a perspective view of a movable contact piece showing still another embodiment of the present invention. In the embodiments shown in FIGS. 2 to 4, the engaging portion at the tip of the push rod 18 is formed by the protrusion 22, but in this embodiment, the movable contact piece 21
A recess 26 is formed in the center of the push rod 1.
This is the tip engaging portion of No. 8.

FIG. 7 shows still another embodiment of the present invention, and is a perspective view showing a modification of the movable contact piece and the receiving piece. In this embodiment, ear pieces 23 are provided on both sides of the movable contact piece 21.
are formed one by one, and a corresponding receiving piece 12' is formed.
Two rising portions (tongues) 12a are provided on each side of the holder. Thickness E of ear piece 23
Of course, in order for the movable contact piece 21 to slide between the distance F and the rising portion 12a, the condition F>E is required.

As still another modification of the present invention, the following configuration can be considered. First, as a modification of the movable contact piece 21, as shown in FIG. It is constructed by forming a notch with a width C on both sides, and the notch is connected to the rising part 1 of the receiving piece.
The four lug pieces 23 may be omitted as a structure for sliding on the lug 2a. Furthermore, as an element for regulating the sliding movement of the movable contact piece 12 in the longitudinal direction, in each of the above-described embodiments, the ear piece 23 of the movable contact piece or the notch and the rising portion 12a of the receiving piece are used. Protrusions (not shown) can be provided on both inner surfaces of the main body 11, and the same function can be performed by the protrusions and the ear piece 23 or the notch.
The rising portion 12a can be omitted.

The present invention is constructed as described above, and according to the present invention, not only the movable contact piece simply contacts and slides on the fixed contact piece, but also the tip portion of the movable contact piece having a special structure according to the present invention, When sliding on the fixed contact piece, oxides generated between the contact pieces are effectively scraped off and removed to the outside (self-cleaning). This has the effect that the contact surfaces of the contact pieces can maintain extremely good contact conditions.

Therefore, in the past, even switches of 3 to 5 A and 125 V had to use silver material for the upper and lower contacts, but with the structure of the present invention,
This is no longer necessary, and by using, for example, an inexpensive copper material instead of an expensive silver material, it is possible to easily obtain a switch with the same capacity and characteristics as described above. Further, for example, in the case of a switch of about 10 A, it is sufficient to use silver material for only one contact piece, and the silver saving effect is large even in a switch with a relatively large capacity.

In addition, in the case of an embodiment in which the tip of the movable contact piece is a V-shaped or U-shaped recess, a so-called twin contact feature also appears, and the contact characteristics are further improved.

Furthermore, the movable contact piece slides on the surfaces of the receiving piece and the fixed contact piece, but unlike the conventional linear sliding contact, the movable contact piece slides at an angle, even if the spring of the push rod Even if it is made stronger, the weight of the sliding action is reduced.

In addition, in the present invention, as shown in FIG. 2, since the dimensional relationship between the length A of the movable contact piece 21 and the distance B between the fixed contact piece 13 is B>A, the movable contact piece is "off". ” side, the inclination angle of the movable contact piece is
Even if the distance is the same as in the conventional case, the distance between the "off" side movable contact piece and the fixed contact piece can be increased. Therefore, the withstand voltage between the contacts is increased, and in this respect, it is possible to obtain a switch with high electrical safety.This effect is particularly noticeable in the case of extremely miniaturized switches as seen recently. It becomes something big.

Furthermore, in the present invention, since the movable contact piece slides left and right, the position where the movable contact piece makes complete contact with the fixed contact piece is different from the position of the movable contact piece that generates an arc during opening and closing, which further stabilizes the contact resistance. can maintain its condition. This principle also explains one of the reasons why good contact can be maintained without using silver material on the movable contact side.

It goes without saying that the present invention can be applied not only to the switch shown in the illustrated embodiment, but also to lever switches and other types of switches.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of a conventional seesaw type switch, Figures 2, 3, and 4 a and b.
are a sectional view and a perspective view of essential parts showing one embodiment of the present invention,
FIG. 5, FIG. 6, and FIG. 7 are perspective views showing other embodiments of the present invention. 1, 11... Switch body, 2, 12... Receiving piece, 3, 21... Movable contact piece, 4, 19... Handle,
5, 13... fixed contact piece, 14... collar, 15... elastic plate, 16... cover, 17... spring, 18... push rod, 20... spindle, 22... protrusion, 23... ear Piece, 24... Powder of oxide, etc., 26... Recess.

Claims (1)

[Claims for Utility Model Registration] (1) In a switch in which a movable contact piece placed on a receiving piece is tilted left and right to open and close by operating a handle, a push rod is attached to the upper surface of the movable contact piece via a spring. A recess or a plurality of protrusions is provided with which the tip of the movable contact piece engages, and the tip portion is formed into a V or U shape, and a lug is provided on the longitudinal side surface to restrict the sliding range of the movable contact piece. A dimension difference is provided between the ear piece and the receiving piece, and a dimension B between the left and right fixed contact pieces with the receiving piece as the center is formed to be larger than the longitudinal dimension A of the movable contact piece, and the push rod interlocked with the handle By moving the movable contact piece to the left and right along with the push rod, the movable contact piece seesaws and selectively contacts the left and right fixed contact pieces, and at the same time, the tip of the movable contact piece contacts the fixed contact piece. When the upper surface of the piece is forcibly cleaned and the movable contact piece comes into contact with the fixed contact piece and stops, the tip of the movable contact piece moves a predetermined distance from the outside of the fixed contact piece. A small switch characterized by its protruding design. (2) Claims for registration of a utility model further characterized in that an uneven portion is formed on the lower surface of the V- or U-shaped tip of the movable contact piece in a direction substantially perpendicular to the moving direction of the movable contact piece. The small switch described in paragraph (1).