JPS6020A - Independent 2-circuit pushbutton 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 The present invention relates to a push button switch that is turned on and off by a stroker and is capable of forming two circuits independently.

In general, this type of pushbutton switch has a case in which a central fixed contact and a peripheral fixed contact are exposed on the bottom of a recess, and an elastically deformable movable contact is housed in the case recess, and this movable contact is connected to a stem. A switch is known in which the center fixed contact and the peripheral fixed contact are electrically connected via the movable contact by being pressed and elastically deformed, thereby turning the switch on and off. As devices become smaller, such push button switches are becoming smaller and can be turned on and off with a short stroke of less than 1 no (approximately 0.3 to 0.5 IllT1) of the stem's movement. Used a lot.

However, such conventional push-button switches for jogged strobes have only one set in which a pair of central fixed contacts and peripheral fixed contacts are brought into conduction by a movable contact to form a circuit. In other words, when trying to configure two circuits, it is difficult to ensure contact stability of at least two contacts due to the short stroke, and to make each contact contact simultaneously. Stroke push-button switches cannot be expanded in functionality and have a narrow range of uses.

This invention was made in view of the conventional situation, and it is possible to configure two circuits by increasing the number of parts and ensuring contact contact even with a short stroke. The purpose of this invention is to provide an independent two-circuit pushbutton switch with expanded functionality.

To achieve this objective, the independent two-circuit pushbutton switch of the present invention includes a case in which two sets of fixed contacts, including a peripheral fixed contact and a central fixed contact, are exposed on the bottom of the recess;
A movable contact is housed in the case recess and is elastically deformed to independently conduct each set of fixed contacts to form two circuits, and a movable contact that can freely move in and out of the case recess on the two sides of the movable contact. The movable contact consists of a stem that suppresses and elastically deforms the movable contact, and a holding plate that prevents the stem from popping out of the case recess. Two contact pieces each having a central contact portion that can freely connect and separate from the central fixed contact are connected in a tllll1 state via a suppressing portion of an insulator that is pressed against the stem in the vicinity of the central contact portion; , on the presser plate.

The movable contact piece is characterized in that a plurality of leg parts that press down the peripheral contact part of the contact piece and/or its vicinity from above protrude into the case recess.

The present invention will be explained below based on the drawings.

1 to 4 are diagrams showing one embodiment of the present invention.

First, to explain the configuration, the independent two-circuit pushbutton switch of this embodiment has a substantially rectangular recess 2 formed in a case 1, a movable contact 21 and a stem 31 housed in this recess 2, and this stem 31 It is covered with a presser plate 41.

The case 1 has fixed contacts 5 on the bottom of the recess 2, which constitute one circuit including a peripheral fixed contact 3 and a central fixed contact 4.
There are two exposed sets.

Each of these contacts 3, 3, 4, 4. are arranged in a line and are connected to respective terminals 6, 6.6 which protrude outward.

A movable contact 21 is provided above the two rotating constant contacts 5, 5 to conduct the peripheral fixed contact 3 and central fixed contact 4 of each set independently to form two circuits. It is arranged. The movable contact 21 has a roughly butterfly shape, and is formed by connecting two contact pieces 22 separated from each other and integrally via a suppressing part 23. This contact piece 22 is formed of a conductor in an annular shape, and one side closer to the outside in the left-right direction in the figure is a supporting side 22a.
2a is formed in a shape along the bottom peripheral edge of the recess 2.

This supporting side 22a is set at a substantially central portion or at a peripheral contact portion 22b that is always in contact with the aforementioned peripheral fixed contact 3, and this contact portion 22b extends outward and serves as a positioning tongue at l'L. It has become. Further, on both sides of this peripheral contact portion 22b, curved protrusions 22 that protrude upward in a semicircular shape are formed by drawing.
c is formed. The connecting side 22d extending from both ends of the supporting side 22a toward the center, that is, toward the suppressing part 2:3 side, is also formed into an arc shape by drawing so that the pressing part 23 is at a higher position than the supporting side 22a. There is. This connecting side 22d
On the buried side 22e on the suppressing portion 23 side that is continuous with the central fixed contact 4, a central contact portion 22f that can freely contact the central fixed contact 4 extends inward of the annular contact piece 22. The buried sides 22e (near the central contact portion 22f) of both contact pieces 22 are made of resin (insulator) and are formed into a rectangular parallelepiped shape.
Both contact pieces 22 are integrally connected by embedding them. Such a movable contact 2] is formed so that when the pressing portion 23 is pressed by the stem 31, the contact piece 22 is elastically deformed to generate a click feeling.

The movable contact 21 has a peripheral contact portion 22b placed on the peripheral fixed contact 3 of the case 1, and a peripheral contact portion 22b placed on the peripheral fixed contact 3 of the case 1.
The part that also serves as the positioning tongue piece b is located in the recess 2 of the case 1.
It is inserted into a positioning recess 7 formed in the peripheral wall of the case and housed in the case recess 2.

A groove 8 is formed in the bottom of the recess 2 and is large enough to allow the suppressing part 23 of the movable contact 21 to be inserted at a position below the suppressing part 23 .

In addition, the stem 31 disposed above the movable contact 21 is
A substantially cubic columnar protrusion 32, a flange portion 33 extending from the columnar protrusion 32 and formed to have approximately the same size as the recess 2, and a hemisphere protruding from the lower side of the columnar protrusion 32. It is formed from a shaped pressing protrusion 34.

This flange portion 33 has a central notch 3 of an appropriate size on both edges located above the support side 22a of the contact piece 22.
5 and a corner notch 36 are formed. In such a stem 31, in order to press the movable contact 21 and cause it to elastically deform, the pressing protrusion 34 comes into contact with the pressing part 23, and the recess 2
The movable contact 21 is stored in the
It is being pushed up.

Further, a holding plate 41 for preventing the stem 31 from popping out from the case recess 2 is formed in a size that covers the case recess 2, and has an insertion hole 42 in the center thereof through which the stem columnar protrusion 32 protrudes and retracts. While the guide wall 43 was raised and lowered,
A positioning hole 44 is formed at each corner. Further, on this holding plate 4j, a plurality of center legs 45 and corner legs/16 that press down this supporting side 22a from above are provided in the case recess 2 at positions corresponding to the supporting side 22a of the contact point 122.
It projects inward.

Such a presser plate 41 is fixed A to the upper surface of the case 1 by inserting the projection 9 on the upper surface of the case 1 into the positioning hole 44 and then caulking the projection 9. In this state, the stem columnar protrusion 32 protrudes from the insertion hole 42, and the flange portion 33 is held down by the holding plate 41.
Further, the central leg portion 45 passes through the stem central notch 35 and presses the peripheral contact portion 22b of the movable contact support side 22a from above to ensure contact with the peripheral fixed contact 3, and the corner leg portion 46 Both ends of the movable contact support side 22a (near the peripheral contact portion 22b) are held down from above through the cutout portion 36.

As described above, an independent two-circuit pushbutton switch is constructed.

Here, a method for manufacturing the movable contact 21 will be explained with reference to FIG. 4. As shown in the figure, this is a process in which coil-supplied strip steel plates are sequentially manufactured through processes such as punching, etc., all in one line. First, as shown in step (a),
Two contact pieces 22 or frame 26 are made by press punching.
A flat plate-shaped member is formed which is connected to each other via a connecting portion 27 so as to have a predetermined positional relationship. Next, as shown in step (b), the resin suppressing portion 23 is formed by insert molding.
The buried side 22e of the contact piece 22 is buried. After that, (C
) As shown in the process, leave one connection part 27,
The other parts are cut, and then drawing is performed to form curved protrusions 22c at four locations in total, and the connecting sides 22d are curved to form a shape in which the central part of the movable contact 21 is raised. Finally, just before assembling the switch, the remaining connecting portions 27 are cut off and separated from the frame 26, completing the manufacture of the movable contact 21.

Next, the operation of such an independent two-circuit push button switch will be explained. When the columnar projection 32 of the stem 31 is suppressed,
The pressing portion 23 of the movable contact 21 is pressed downward by the pressing protrusion 34 . As a result, the contact piece 22 is elastically deformed, and the suppressing part 23 is displaced downward and enters the groove 8 of the recess 2 . At this time, a click feeling is given to the operator, and both central contact portions 22f move downward in parallel to come into contact with both central fixed contacts 4 simultaneously and stably. In particular, by forming the center leg portion 45 and the corner leg portions 7I6 on the presser plate 41, the movable contact piece 2
Since the support side 22a of No. 2 is pressed down, the support side 22a is prevented from jumping up (warping) when the stem is pressed.
The contact state between the peripheral contact portion 22b and the peripheral fixed contact 3 is always maintained. Therefore, each set of fixed contacts 5 is separately and reliably electrically connected via both contact pieces 22, and two independent circuits are constructed. Furthermore, when the stem pressing force is released, the movable contact 21 returns to its original shape, and the central contact portion 22f is separated from the central fixed contact 4, causing the two circuits to become non-conductive, and the pressing force of the movable contact 21 The stem 31 is pushed up at the portion 23 and returns to its original position. Of course, in such an independent two-circuit push button switch, the amount of displacement of the suppressing portion 23, that is, the amount of movement of the stem 31 is 0.
Although it is a Shaw 1-strotor with a diameter of about 3 to 0.5 cylinders, good contact contact can be obtained as described above due to the characteristic movable contact 21.

In addition, even if two circuits can be configured, the movable contact 21 is formed by integrating the contact piece 22 and the suppressing part 23, so the number of parts does not increase compared to the conventional method, and the structure is simple and independent. A two-circuit pushbutton switch is made. Moreover, since the number of parts does not increase, it becomes easy to miniaturize the switch and automate assembly.

Note that the movable contact according to the present invention is not limited to the butterfly shape as in the above embodiments, but may have various shapes. In addition, in this embodiment, the presser plate 41
Although the center leg portion 45 and the corner leg portion 46 are formed on both sides, the leg portion according to the present invention may be only one of the corner leg portion 46 or the center leg portion 45. Of both legs 45 and 46, preferably the corner leg 46 is the one that forms the movable contact 2.
It is convenient for holding down 1.

As explained above, according to the present invention, even with a short stroke, both contacts can be brought into contact at the same time, and stable contact can be obtained, so that two independent circuits can be constructed. In addition, since the number of parts does not increase, it is possible to make the switch more compact.Furthermore, since the legs are provided, the contact between the peripheral contact and the peripheral fixed contact can be maintained reliably. can,
It has many effects.

[Brief explanation of the drawing]

The figures show an embodiment of the independent two-circuit pushbutton switch of the present invention. Figure 1 is a sectional view of the switch, Figure 2 is an exploded perspective view of the switch, and Figure 3 is a case of the switch. The plan view and FIG. 4 are explanatory diagrams showing the manufacturing process of the movable contact of the switch. 1... Case, 2... Recess, 3... Peripheral fixed contact, 4... Center fixed contact, 5... Fixed contact, 21...
Movable contact, 22... Contact piece, 22a... Support side, 2
2b...Peripheral contact part, 22e/Embedded side, 22f...
Central contact portion, 23... Pressing portion, 31... Stem, 41
...Press plate, 115...Central leg (leg), 46...
Corner leg (leg).

Claims (1)

[Scope of Claims] A case in which a recess is formed and two sets of fixed contacts, including a peripheral fixed contact and a central fixed contact, are exposed on the bottom of the recess, and the case is housed in the case recess. a movable contact that is elastically deformed to independently conduct the sets of fixed contacts to form two circuits; The movable contact includes a stem that presses the contact to elastically deform it, and a holding plate that prevents the stem from popping out of the case recess. Two contact pieces each having a central contact portion that can be freely moved toward and away from the contact are connected in a spaced-apart manner via a suppressing portion of an insulator that is pressed against the stem near the central contact portion; A plurality of legs are provided on the plate to hold down the peripheral contact portion of the movable contact piece and/or its vicinity from above and protrude into the case recess. push button switch.