JPH036994Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improved structure of a switch for a seesaw reversing mechanism, and in particular, improves the contact area between the movable contact piece and the receiving piece to eliminate wear and deterioration of that part, and to reverse the tilting movement of the movable contact piece. The present invention relates to the structure of this type of switch with good moderation.

An example of a conventionally known switch of this type is shown in FIG. In the figure, a cover 11 is attached and fixed to the open upper surface of the switch case 1, and a central fixed contact piece 13 and left and right fixed contact pieces 14 and 15 are fixedly penetrated to the bottom plate 1a of the case 1, respectively. The flat movable contact piece 12 is placed on the upper surface of the contact piece 13 in a seesaw manner, that is, the central fixed contact piece 13 also serves as a receiving piece for the movable contact piece 12. The lower end of the sleeve 22 is fixed to the center of the cover 11;
Corresponding protrusions provided on the left and right sides of the lower end of the sleeve 22 are inserted into the respective arcuate holes provided on the left and right sides of the central rectangular hole, and are bent and caulked. A plunger 21, whose upper end is inserted and fixed to the surface of the handle 20, is inserted into the sleeve 22 so as to be vertically slidable and cannot be removed upwardly. A pin 23 with an upper flat plate is inserted into a recess on the lower surface of the plunger 21, and a taper spring 24 is inserted between the lower surface of the upper flat plate and the upper surface of the central portion of the cover 11.

Inside the case 1, the converter 16 is rotatably supported around a fixed shaft 17 inserted into the front and rear through holes in the upper part of the converter 16. A chevron-shaped protrusion 16a is provided at the center of the upper surface of the converter 16, and a slider 18 is provided in a recess on the lower surface.
is inserted under the back pressure of the coil spring 19. The lower end of the pin 23 is located directly above the chevron-shaped protrusion 16a,
Therefore, each time the handle 20 is pressed, the pins 23 alternately come into contact with the left or right slope of the chevron-shaped protrusion 16a and descend to push down the low ground on that side, thereby moving the converter 16 alternately counterclockwise or clockwise. Rotate. The slider 18 is placed on the upper surface of the movable contact piece 12 and moves left and right in accordance with the left and right tilting of the converter 16.

Conventionally, the portion of the upper end of the receiving piece 13 on which the movable contact piece 12 is mounted has been flat. Therefore, when the handle 20 is moved slowly or moved halfway and then stopped, the slider 18 stops at the center position and the movable contact piece 12 stops at the horizontal position, as shown in FIG. obtain. In this state, movable contact piece 1
Not only is this inconvenient because contact on both the left and right sides of the pin 23 is broken, but if the handle is pushed down again in this neutral state, the lower end of the pin 23 collides with the top of the chevron-shaped protrusion 16a of the converter 16, as shown by the dotted line. As a result, the switching operation becomes impossible, and furthermore, as shown by line 16b, there is a risk that the portion above this line may be destroyed and missing. Further, in the vicinity of this neutral state, the reversal of the tilting movement of the movable contact piece is extremely slow, and the moderation of switching is not good. Furthermore, when the movable contact piece reverses its tilting motion, bouncing occurs at the contact area between the movable contact piece and the receiving piece, and an arc is generated in that area, and this arc causes wear, heat generation, and increased contact resistance in that area. However, it has the disadvantage of reduced durability. Particularly when used with a relatively large current, the problem caused by the above-mentioned arc becomes noticeable.

Conventionally, in order to avoid the above-mentioned inconvenience due to bouncing, the central inverted U-shaped part of the W-shaped elastic brush was fitted onto the upper end surface of the receiving piece, and the enlarged upper ends of both the left and right pieces were connected to the left and right sides near the center of the lower surface of the movable contact piece. It is known that a structure in which the movable contact piece is elastically brought into contact with each other is known, but although this structure can prevent the generation of arcs due to the above-mentioned bouncing, the presence of the W-shaped elastic brush slows down the reversal of the tilting movement of the movable contact piece. There are drawbacks that can lead to negative effects that encourage this.

The present invention improves the structure of the contact portion between the movable contact piece 2 and the receiving piece in order to eliminate the various drawbacks mentioned above, and several embodiments thereof will be described in detail below with reference to the drawings. First, the third embodiment showing the first embodiment of the present invention will be explained.
In the figures to FIG. 6, the flat movable contact piece 2 is placed in a seesaw-inverted manner on a receiving piece 5 which also serves as a central fixed contact piece, and between them, like the movable contact piece 2, a conductive thin plate-shaped plate that is long in the left and right directions is mounted. An elastic piece 7 is inserted. Movable contact piece 2
A square protrusion 2b is formed on the front and rear end surfaces at the center between the left and right sides, and a square hole 2c is bored in the center thereof. A chevron-shaped protrusion 2a is formed at the center between the left and right sides of the lower surface of the movable contact piece 2, as shown in FIG. 6 (vertical inverted view). The upper end of the receiving piece 5 is formed into a U-shape (FIG. 5) when viewed from the side, that is, square pillars 5b are formed at the front and rear, into which the square hole 2c of the projecting piece 2b is inserted. The main body portion 5a, which is slightly narrower below the upper end of the U-shape, extends downwardly through a rectangular hole in the case bottom plate 1a, and the downwardly facing stepped surfaces of the lower ends of both supports 5b are placed on the bottom plate 1a. A slightly higher plateau 5c is formed in the center of the bottom between the front and rear columns 5b, and a lower plateau 5 is formed in front and behind it.
d is formed.

The elastic piece 7 is formed into a substantially dogleg shape (FIG. 3) pointing upwards, and has a rectangular hole 7a in its center.
The center portion between the left and right sides of the elastic piece 7 is placed on the bottom surface of the upper end of the receiving piece 5, and the rectangular hole 7a is located on the high ground 5 of the bottom surface.
c is placed in it, and the center portions of its front and rear lower surfaces are respectively placed on the front and rear low areas 5d of the bottom surface. Next, the movable contact piece 2 connects the hole 2c to the support 5b.
When the slider 18 is placed on one side of the upper surface and pushed from above, the tip of the lower chevron-shaped protrusion 2a is placed on the high ground 5c on the bottom surface, as shown in FIG. Further, the elastic piece 7 is pushed open somewhat from its doglegged shape, and the left and right tips 7b of the upper surface are pressed against the corresponding lower surface of the movable contact piece 2. A small protrusion 5e is provided on the outer surface of each upper end of both supports 5b of the receiving piece, and a downward stepped surface is formed at the lower end of the small protrusion 5e. This is to prevent the movable contact piece 2 from coming off upwards, and when the contact piece 2 is first attached to the receiving piece 5, both struts 5b, which have some elasticity, are compressed from the front and back. The hole 2c extends beyond the small protrusion 5e to the support 5b.
is inserted downward.

In FIG. 3, the slider 18 is connected to the handle 20 (first
When the movable contact piece 2 moves to the right in response to the depression of the contact piece 5 and passes directly above the receiving piece 5, the movable contact piece 2 reverses from the lower left state to the lower right state in a seesaw manner; The apex of the lower chevron-shaped protrusion 2a is the receiving piece 5
Since the contact piece 2 rests on the high ground 5c of the upper bottom surface of the contact piece 2, the contact piece 2 rapidly reverses itself around the apex and maintains a stable neutral state at the neutral position as shown in FIG. No. In addition, in response to the possibility that the contact piece 2 may bounce due to reaction during the above-mentioned reversal switching and the contact between the chevron protrusion 2a and the high ground 5c may be separated, even if this separation occurs, the elastic piece 7 Since the contact between the left and right lower surfaces and the high ground 5c is maintained,
Electrical contact between the contact piece 2 and the receiving piece 5 is ensured, and no arc is generated between them. Regarding the inventive relationship between supporting the movable contact piece 2 at the apex of the chevron-shaped protrusion 2a and inserting the elastic piece 7 between the contact piece 2 and the receiving piece 5, it should be noted that the purpose of quick movement of the contact piece 2 is If the protrusion 2a is supported at the apex of the protrusion 2a, the contact area between the contact piece 2 and the receiving piece 5 becomes small and a large load current cannot be obtained. Since a relatively large contact area can be obtained between the upper left and right surfaces and the lower surface of the contact piece 2, the above-mentioned drawbacks can be compensated for, and the allowable current can be increased while ensuring the quick-acting effect.

In FIGS. 7 to 9 showing the second embodiment of the present invention, the movable contact piece 3 has a projecting piece 3b projecting upward and downward at the front and rear edges of the central part between the left and right sides thereof. A recess is provided in the center of the piece, and a downward chevron-shaped protrusion 3a is formed in the center. The receiving piece 5' of the contact piece 3 has pillars 5'b that protrude forward and backward at the upper end of the lower main body part 5'a, and on the bottom surface between these pillars, there are a slightly higher plateau 5'c in the front and rear and a raised area between them. A lowland 5'd is formed. The conductive elastic piece 7' inserted between the contact piece 3 and the receiving piece 5' is a plate-like piece that is long in the same direction as the movable contact piece 3. Two projecting pieces 7'c are provided, and each recess 7'a is formed between them.

When the elastic piece 7' is placed on the bottom surface of the upper end of the receiving piece 5', the front and rear projecting pieces 7' move down with the high points 5'c held between them, and the center part between the left and right sides of the elastic piece 7' becomes low. Get on top of place 5'd. The engagement between the projecting piece 7'c and the height 5'c prevents the elastic piece 7' from moving back and forth, from side to side, and from rotating in the horizontal plane. When the movable contact piece 3 is placed in the recess on the upper end surface of the receiving piece 5', both protrusions 3b on the front and rear of the contact piece 3
sandwich each high point 5'c between them, and the apex of each of the front and rear chevron-shaped protrusions 3c rests on the upper surface of the high point 5'c, and this apex becomes the center of seesaw rotation of the contact piece 3. The engagement of the projecting piece 3b with the height 5'c and the support column 5'b prevents the contact piece 3 from moving back and forth, from side to side, and from rotating in the horizontal plane. In order to prevent the contact piece 3 from coming off upward, a small inward protrusion 5'e is provided on the upper inner surface of each support 5'b.
is provided. These engage with the respective central portions of the front and rear protruding pieces 3b-3b of the contact piece 3, and when initially inserted, these protruding pieces push apart the somewhat elastic struts outwards and pass over the small protrusions. Go down.

10 to 12 showing the third embodiment of the present invention
In the figure, the movable contact piece 4 is provided with a rectangular protrusion 4b at the front and rear edges of the central portion between the left and right sides, and further provided with a rectangular protrusion, that is, an ear piece 4c at the center thereof. The receiving piece 6 has front and rear U-shaped support pieces 6b (FIG. 11), and a horizontal plate 6f (FIGS. 10 and 12) connecting the lower right portions of each of these inner surfaces is provided. The right end of the horizontal plate 6f is bent downward at a right angle to form a lower piece 6a, and the left end is bent upward and to the right by more than 90 degrees, excluding the front and rear small parts, to form a diagonal standing piece 6g. Form.
A rectangular recess 6d is provided at the center of the upper end of this diagonal upright piece, and an edge portion of the press surface, that is, a chevron-shaped protrusion 6c, is formed before and after the rectangular recess 6d. A linear conductive elastic piece 8 is inserted between the movable contact piece 4 and the receiving piece 6. This linear elastic piece is also formed into a slightly upward generally dogleg shape, with a slightly downwardly bent contact portion 8b formed at its right end, and an upwardly bent engagement contact portion 8c formed at its left end. be done.

When the movable contact piece 4 is inserted between the front and rear U-shaped support pieces 6b of the receiving piece 6, the front and rear ear pieces 4c are inserted between the U-shapes of the front and rear support pieces 6b, respectively, and the left and right sides of the lower surface of the contact piece 4 are The center portion rests on the top of the front and rear chevron-shaped protrusions 6c. When the elastic piece 8 is inserted in the middle, its central part rests on the recess 6d, the right end part 8b contacts the lower surface of the contact piece 4, and the left end bent piece 8c contacts the corresponding part of the contact piece 4. It is inserted into the provided hole 4d. Ear piece 4
The engagement between the base projecting piece 4b and the U-shaped support piece 6b prevents the contact piece 4 from moving back and forth and from side to side and rotating in the horizontal plane. Four inward small protrusions 6e on the front, rear, left, and right sides are provided on the upper part of each inner side of the U-shaped support piece 6b, and these protrusions 6e engage with the surfaces of the four protrusions 4b on the front, rear, left, and right sides, and move upwardly on the contact piece 4. prevent the departure of When first inserted, both support pieces 6b are slightly pushed outward. The left end bent piece 8c of the linear elastic piece 8 is the hole 4d.
This prevents the device from falling sideways. Note that the elastic piece 8 is attached to the contact piece 4 at its left end 8c.
Since the position relative to the recess 6d in the center portion is fixed, the position relative to the recess 6d in the center portion may slightly move left and right as the elastic piece 8 expands and contracts in the longitudinal direction during initial assembly and when the contact piece 4 is tilted left and right. is carried out freely.

13 and 14 showing the fourth embodiment of the present invention
In the figure, the movable contact piece 4' has almost the same shape as the movable contact piece 4 described above, except that two holes 4'd are provided on the left side. The receiving piece 6' is also quite similar to the above-mentioned receiving piece 6, except that the upright piece 6'g, which is bent upward from the center of the horizontal connecting piece 6'f, stands straight upwards and its upper end In each case, a horizontal high point 6'c and a low point 6'd are formed on the upper surface, and instead, a chevron-shaped protrusion 6'h is formed on the bottom surface of the central recess of each of the front and rear U-shaped support pieces 6'b. The difference is that there are
Another difference from the case shown in FIG. 11 is that the width of the low land 6'd is relatively wide and the width of the high land 6'c is correspondingly narrow. The conductive elastic piece 8' is made by folding one wire in half and bending it upward into a somewhat dogleg shape, and two upwardly bent pieces 8'c are formed at the left end thereof. . These bent pieces are inserted into each hole 4'd, and the upper surface of the right end portion 8'b is brought into contact with the lower surface of the contact piece 4'. The front and rear tabs 4'c of the contact piece 4' are placed on the apexes of the corresponding chevron-shaped protrusions 6'h. The center portion of the elastic piece 8' is placed on the low ground 6'a.

In each of the above-mentioned embodiments, the receiving piece is provided with a portion that restricts the movement of the movable contact piece back and forth and left and right and rotation in the horizontal plane, but as a modification, the above-mentioned restriction portion may be provided on the switch case. Furthermore, although all of the above embodiments have been described as improvements to push button switches,
The present invention can equally be applied to other toggle switches, slide switches, waveform switches, etc.

According to the present invention, since the seesaw reversible movable contact piece is supported on the receiving piece at the apex of the chevron-shaped projection, the tilting movement of the movable contact piece is quickly and reliably reversed.
The movable contact piece does not stop at the neutral horizontal position,
On the other hand, by inserting a conductive elastic piece between the movable contact piece and the receiving piece, electrical contact separation due to bouncing that is likely to occur when the movable contact piece is reversed in tilt is avoided, thereby eliminating the generation of arcs. Moreover, the conductive elastic piece inserted between the movable contact piece and the receiving piece compensates for the reduction in current carrying capacity due to the movable contact piece being supported at the top of the chevron-shaped protrusion, allowing large currents to be switched on and off. It has an effect that can also be used on Switch.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional front view of a conventional switch, Fig. 2 is a partial cross-sectional front view explaining its drawbacks, Fig. 3 is a cross-sectional front view of the main parts of the switch according to the present invention, and Fig. 4 is an exploded view of the switch. FIG. 5 is a side sectional view, FIG. 6 is an inverted perspective view of a part, FIG. 7 is a front sectional view of the first modification, FIG. 8 is an exploded perspective view thereof, and FIG. 9 is a side sectional view. 10 is a sectional front view of the second modification, FIG. 11 is an exploded perspective view thereof, FIG. 12 is a side sectional view, FIG. 13 is a sectional front view of the third modification, and FIG.
FIG. 4 is an exploded perspective view thereof. 1... Switch case, 2, 3, 4... Movable contact piece, 5, 6... Central fixed contact piece/receiving piece, 7, 8...
Conductive elastic pieces, 2a, 3a, 6c, 6'h... chevron-shaped protrusions.

Claims (1)

[Scope of utility model registration request] A seesaw inversion formed by placing a movable contact piece via a conductive elastic piece on a receiving piece that also serves as a central fixed contact piece fixed to the bottom of the switch case, and engaging the said receiving piece and the movable contact piece in a concave and convex manner. In this type of switch, an angular protrusion is formed on either the lower surface of the center in the longitudinal direction of the movable contact piece or the upper surface of the receiving piece, and a recess is provided in a part of the receiving piece, so that the elastic piece is engaged with the unevenness. A switch for a seesaw reversing mechanism, in which the movable contact piece is placed on a part of the receiving piece, and both ends of the elastic piece are pressed against the back surface of the movable contact piece.