KR0152431B1 - Push button switch - Google Patents

Abstract

The present invention uses a wire rod that is cheaper than a strip-shaped metal plate and is easy to process, and by considering the prevention of rotation or dropping of the wire rod insulated case, the wear of the terminal cutting knife can be suppressed and the material cost can be reduced. To provide a pushbutton switch.

As the base material of the stationary contact 9 and the terminal 2, the wire 8 which was crimped partly was used, and the said crimping | compression-bonding part 8c of this wire 8 was embedded in the insulating case 1.

Description

Pushbutton switch

1 is a plan view showing the manufacturing process of the pushbutton switch of the first embodiment of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a side view showing the completed state of the pushbutton switch.

4 is a cross-sectional view of a pushbutton switch according to a second embodiment of the present invention.

5 is a cross-sectional view of the pushbutton switch in a direction different from that of FIG.

6 is a perspective view, as viewed obliquely from below, of a movable mold of a mold used in insert molding of a pushbutton switch.

7 is a perspective view from above of an oblique view of the stationary die of the mold.

8 is a perspective view of main parts of a ring member which is a constituent member of a pushbutton switch.

9 is an explanatory diagram showing a state in which the mold tightening of the mold is completed by the insert molding process of the pushbutton switch.

10 is an explanatory diagram showing a state in which a molten resin is filled in a cavity by a molding step.

11 is an explanatory diagram showing a state in which a mold is opened by a molding step.

12 is a side view for explaining a taping package of a conventional pushbutton switch.

13 is a partial cross-sectional side view for explaining the mounting operation of a conventional pushbutton switch.

* Explanation of symbols for main parts of the drawings

1,11 Insulation case 9,12 Fixed contact

8,13 Terminal 4,14 Rubber Contact

8c: crimped portion 17a: recessed portion

The present invention relates to a compact pushbutton switch most suitable for taping packaging or automatic mounting.

This type of pushbutton switch is usually made of a generally molded synthetic resin case with a bottom, a pair of fixed contacts exposed on the bottom surface of the insulating case, and derived from each fixed contact to the outside of the insulating case. A pair of protruding terminals and a movable contact which folds to both fixed contacts in the insulating case, and a pair of band-shaped metal plates extending in parallel to each other are inserted into the mold during molding of the insulating case, By cutting or bending a band-shaped metal plate, a part of each band-shaped metal plate is comprised by the fixed contact and the terminal. When the crimping operation force is applied to the movable contact facing the inner bottom of the insulated case, and it is brought into contact with both fixed contacts, both fixed contacts are conducted through the movable contact to switch to the switched-on state. As a specific example to realize a configuration in which the contact point is automatically returned to the initial position and returned to the switch-off state and manufactured with a low number of parts, an elastic deformation is provided by installing a movable contact on a ceiling surface of a rubber member that is formed in an approximately air shape. BACKGROUND OF THE INVENTION Pushbutton switches that use a fixed contact as far as possible and squeeze the apex of this fixed contact are widely known. Moreover, the pushbutton switch which used the reverse spring as a movable contact and crimps and drives this reverse spring to a stem is also spreading.

Since such a small pushbutton switch is taped and packaged as shown in FIG. 12, a large number can be collectively stored and stored efficiently and can be easily supplied to an automatic mounting machine. That is, in the same figure, each pushbutton switch taped in a line at a predetermined interval has a Ginza made of a thick paper or the like at the tip of the terminal 2 protruding downward of the insulating case 1. Iv) It is held by the carrier tape 3 of the shape, and the carrier tape 3 is meandered, so that a plurality of push button switches can be efficiently stored and stored in the parts storage case, not shown. When mounting on the printed circuit board, the pushbutton switch is taken out of the component storage case while being taped and packaged, and supplied to the automatic mounting machine. First, the terminal 2 is connected to the chain position of FIG. The pushbutton switch is removed from the carrier tape 3, and then the terminal is connected to the front end surface of the lead guide pin 7 inserted into the terminal mounting hole 6 of the printed circuit board 5 as shown in FIG. By contacting the tip of (2) and moving the lead guide pin 7 downward, the terminal 2 is inserted into the predetermined terminal mounting hole 6, and then, the terminal is cut using a cut clean knife, not shown. By performing the cutting and bending processing of (2), the pushbutton switch is provided at a predetermined position on the printed board 5. In addition, reference numeral 4 in the drawing indicates a substantially round air-shaped fixed contact assembled to each pushbutton switch, and the movable contact shown in the ceiling of the rubber contact 4 is provided, and the insulation case ( A fixed contact, not shown, is provided at a position opposite to the movable contact on the inner bottom of 1).

By the way, when removing this kind of pushbutton switch from the carrier tape 3 or installing it on the printed board 5, the terminal 2 is cut using a lead cutter or cut clean knife as described above. Since the terminal 2 made of a band-shaped metal plate cannot be cut unless a relatively large shear force is applied, the abrasion of the knife is severe in the cutting process of the terminal 2 to be installed, in other words, the knife life is short and this pushes. It is a factor that causes cost up of the button switch.

Therefore, it is conceivable to use a round wire member or each wire member which is easily cut instead of a strip-shaped metal plate as a metal member constituting the fixed contact point and the terminal. However, even when inserting a conventional wire rod and forming an insulating case, sufficient installation strength cannot be obtained. It was difficult to secure high reliability because the wire rod might rotate or fall off with respect to the insulating case.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art to be installed, and its object is to provide a highly reliable pushbutton switch which can suppress abrasion of a knife for cutting a terminal and can also reduce material costs.

In order to achieve the object of the present invention, the first means of the present invention comprises an insulating case made of synthetic resin, a fixed contact formed by exposing a part of the metal member to be inserted at the time of molding the insulating case to the inner bottom surface of the insulating case, A push button switch having a terminal formed by protruding another part of the metal member to the outside of the insulating case and a movable contact in contact with the fixed contact in the insulating case, using a wire rod as the metal member, A part of the wire rod is crimped, and the crimped portion of the wire rod is embedded in the insulating case.

Moreover, as a 2nd means of this invention, the said crimping | compression-bond part is comprised by the recessed part embedded in the insulation case provided in the back side of the said fixed contact surface.

According to the above means, since the wire can be cut with a relatively small shear force, the wear of the terminal cutting knife can be suppressed, and the material cost is low by using the wire, and the crimping portion of the wire is embedded in the insulating case. If present, the wire rod can be prevented from rotating or falling off.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a plan view showing a manufacturing process of the pushbutton switch as an embodiment, FIG. 2 is a sectional view along the line AA of FIG. 1, and FIG. 3 is a side view showing the completed state of the pushbutton switch, and FIG. 5 and corresponding parts are denoted by the same reference numerals.

1 to 3, the insulating case 1 of the pushbutton switch is formed by forming a synthetic resin material into a substantially cylindrical shape with a bottom, and is pressed in a predetermined position in advance when the insulating case 1 is molded. Two wire rods 8 arranged in parallel are placed in a mold and inserted into the mold, and after molding, the terminal forming portions 8a protruding outward from the insulation case 1 of each wire rod 8 are bent at approximately right angles. By cutting the unnecessary portion 8b, the fixed contact 9 and the terminal 2 are obtained from each wire 8, and the crimping portion 8c of each wire 8 is the bottom plate portion of the insulating case 1. It is buried in (1a). That is, in the finished product of this pushbutton switch, the portion exposed to the inner bottom surface of the insulating case 1 among the wire rods 8 becomes the fixed contact 9 and simultaneously protrudes out of the insulating case 1. The part becomes the terminal 2, and the remaining part of each wire 8 containing the crimping | compression-bonding part 8c is embedded in the bottom board part 1a of the insulating case 1. As shown in FIG. In addition, the inner wall of the insulating case 1 has an annular groove 1b for inserting an annular bottom portion of an approximately round air-shaped rubber contact 4, or air evacuation for removing a pressure difference in and out of the rubber contact 4; The groove 1c is provided, and the movable contact which is not shown in figure is provided in the ceiling surface of the rubber contact 4 which opposes a pair of fixed contact 9.

In this embodiment, since the hoop-shaped ring wire whose surface is covered with silver is used as the wire 8, the transfer conductivity of the fixed contact 9 and the terminal 2 is assured, and the molding die By inserting a plurality of insulating cases 1 from the drawing out, the insert molding can be performed efficiently. In addition, in this embodiment, the crimping part 8c is formed by crimping | processing as the diameter of each wire 8 becomes about half.

The pushbutton switch thus completed is taped and packaged in a row at a predetermined interval as described above, and the plurality of pushbutton switches are accommodated in the parts storage case by winding the Ginza-shaped carrier tape holding the terminal 2. · Can be stored. When mounting on a printed circuit board, the pushbutton switch is taken out of its parts storage case with tape wrapping and supplied to the automatic mounting machine. First, the pushbutton switch is removed from the carrier tape by cutting the terminal 2 using a lead cutter. Next, the tip of the terminal 2 is brought into contact with the front end of the lead guide pin, guided to the terminal mounting hole of the printed board, and then pushed by cutting and bending the terminal 2 using a cut clean knife. The button switch can be automatically mounted at a predetermined position on the printed board.

When the fixed contact 9 and the terminal 2 of the pushbutton switch are formed using the wire 8 as in the above embodiment, the material cost is higher than that of the conventional products in which the strip-like metal plate is processed to form the fixed contact and the terminal. It is inexpensive and easy to process, and since the wire 8 can be cut with a relatively small shear force, the wear of the terminal cutting knife (lead cutter or cut clean knife) can be suppressed and the life thereof is extended. The manufacturing cost of a pushbutton switch can be greatly reduced.

In addition, if the crimping portion 8c is formed in the wire rod 8 in advance as in the above embodiment, and the crimping portion 8c is embedded in the bottom plate portion 1a of the insulating case 1 by insert molding, Since the synthetic resin material filled around the crimping portion 8c strongly restricts the movement of the wire 8 in the bottom plate portion 1a, the wire 8 is firmly fixed to the insulating case 1, and thus, the round wire Even in this case, sufficient installation strength can be obtained. In other words, each wire 8 is secured by embedding the crimped portion 8c in the insulating case 1 to increase the anti-rotation effect or the anti-falling effect.

Next, a second embodiment of the present invention will be described with reference to Figs.

4 is a cross-sectional view of the pushbutton switch, FIG. 5 is a cross-sectional view of the pushbutton switch viewed from a direction different from FIG. 4, and FIG. 6 is a perspective view of the movable die of the mold used for insert molding of the pushbutton switch, as viewed obliquely from below. 7 is a perspective view of the mold fixed to the mold obliquely from above, FIG. 8 is a perspective view of the main portion of the ring member which is a constituent member of the pushbutton switch, and FIG. 9 is an insert molding process of the pushbutton switch. Explanatory drawing which showed the completed state, FIG. 10 is explanatory drawing which showed the state which filled the molten resin in the cavity in the shaping | molding process, and FIG. 11 is explanatory drawing which showed the state which opened the mold in the shaping | molding process.

4 and 5 show a pair of rubber peaks exposed to an insulating case 11 of a synthetic resin material formed in a substantially cylindrical shape with a bottom and an inner bottom surface 11a of the insulating case 11 ( 12 and 12, the terminal 13 protruding from each rubber contact 12 and protruding outward of the insulating case 11 and the bottom portion in the insulating case 1, are assembled to the rubber contacts 12 and 12. It is composed of a rubber contact 14 which can be contacted and spaced apart and has a conductive rubber therein, but the base material of the rubber contact 12 and the terminal 13 in a conductive relationship has good adhesion to the insulating case 11 at a predetermined position. As one round wire member, two round wire members 17 and 17 are partially embedded in the insulating case 11. That is, the recesses 17a and 17a are formed in two ring wires 17 and 17 extending in parallel to each other by pressing, and the ring wires 17 and 17 are inserted into the cavity of the mold to insulate the case. By molding (11), since the concave portions 17a and 17a are embedded in the insulating case 11, these ring members are difficult to rotate with respect to the insulating case 11, making it difficult to drop off. In addition, the surface of the ring member 17 is covered with silver.

In the pushbutton switch configured as described above, when the operator pushes the key top, which is not illustrated, the rubber contact 14 facing the inner bottom surface 11a of the insulating case 11 is moved downward by receiving the driving force. In contact with (12, 12), both rubber contacts 12, 12 are conducted via the rubber contact 14, and are switched to the switched-on state. Moreover, when the press-in operation force on the rubber contact 14 is removed in the switched-on state, since the rubber contact 14 returns to its original position by its elasticity, the conduction of both rubber contacts 12 and 12 is released. The switch is turned off.

Next, the manufacturing method of the said pushbutton switch is demonstrated.

The insulated case 11 of this pushbutton switch uses a die formed by combining the movable die 18 shown in FIG. 6 and the stationary die 19 shown in FIG. 7, and the wire member 17 in the cavity 20. ) Is inserted and molded, but by inserting the movable pin 22, which is movable up and down in accordance with the action of the slide cam 21, at the center of the stationary mold, the round member is tightened when the movable mold 18 and the stationary mold 19 are tightened. As shown in Fig. 8, reference numeral 17 designates the crimping process.

That is, as shown in FIG. 9, the ceiling surface 22a of the movable pin 22 of the ring member 17 is inserted into a cavity by inserting the ring member 17 into the cavity 20 in which the movable pin 22 is intruded as shown in FIG. ) And the portion sandwiched between the recessed portion 18a of the movable die 18 to form the recessed portion 17a.

Subsequently, as shown in FIG. 10, the slide cam 21 is moved in the direction of arrow A to move the movable pin 22 out of the cavity 20, and then the molten resin 23 is filled into the cavity 20. As shown in FIG. By cooling and solidifying the resin, a resin is formed around the recessed portion 17a.

Thereafter, as shown in FIG. 11, the insulating case 11 is transported out of the mold by opening the mold and sending a predetermined amount of the hoop-shaped ring member 17, and the slide cam 21 moves in the direction indicated by the arrow B. As shown in FIG. Since the raw round wire 17 is arrange | positioned between the movable movable pin 22 and the movable mold 18, insert molding can be performed continuously by repeating the said operation | work. In addition, the code | symbol 15 in FIG. 6 is a well-known inject pin used at the time of mold opening.

When the insulating case 11 is transferred to the predetermined position in this way, the rubber upper end 14 is assembled to the insulating case 11, and the upper peripheral part 16 of the rubber contact 14 is assembled into the protrusion 11b of the insulating case 11. The terminal 13 is formed by cutting or bending the round wire 17 to which the movable contact is fixed to the case, and the insulated case 11 protrudes outward to form the terminal 13, as shown in FIG. Configure the button switch.

Then, the completed pushbutton switch is taped and wrapped with a carrier tape, and when mounted, it is checked by an automatic mounting machine and detached from the carrier tape, so that automatic mounting to a predetermined position on a printed board can be easily performed.

Thus, in the above embodiment, since the crimping process is performed on the ring member 17, the anti-rotation strength and the fall prevention strength of the ring member 17 with respect to the insulating case 11 are significantly increased. Despite the use of wire rods, high reliability is secured.

In the second embodiment of the present invention, recesses 17a and 17a are provided on the back surface of the rubber contact 12 in the ring member 17, but this is one example, and the recesses are provided to be embedded in the case. Other shapes may be sufficient as this.

In addition, in the above first and second embodiments, the pushbutton switch incorporating the fixed contact functioning as the movable contact and the actuator has been described. It goes without saying that the present invention is also applicable to a crimping switch.

In the first and second embodiments, although the wire rod 8 is used as the wire rod 8, almost the same effects can be expected even when each wire rod is used.

As described above, according to the present invention in which a wire rod is used as the base material of the fixed contact point and the terminal, and the crimping portion of the wire rod is embedded in the insulating case, the material cost can be reduced by using the wire rod instead of the band-shaped metal plate. Since the synthetic resin material filled around the crimping portion can be firmly fixed, the deterioration of reliability due to the lack of installation strength can be prevented, and various excellent effects can be obtained.

Claims (2)

An insulating case made of synthetic resin, a fixed contact formed by exposing a part of the metal member to be inserted at the time of forming the insulating case to the inner bottom surface of the insulating case, and another part of the metal member protruding outward of the insulating case A pushbutton switch having a terminal comprising a terminal and a movable contact in contact with and detached from the fixed contact in the insulating case, wherein the wire member is crimped and a part of the wire is pressed. Push button switch, characterized in that the buried in the insulating case. The push button switch according to claim 1, wherein the crimping portion is a concave portion embedded in an insulating case provided on the rear side of the fixed contact surface.