JPH0548149U - Push button switch - Google Patents

Abstract

(57) [Summary] [Purpose] Use a terminal with a cross-sectional shape that can be cut with a relatively small shearing force and is easy to align with the lead guide pin.
By considering the contact area between the base material of the terminal and the insulating case formed by inserting the base material, it is possible to suppress the abrasion of the blade for cutting the terminal and to improve the workability in the mounting stage. Provide at low cost. [Structure] A round wire rod 8 is used as a base material of a fixed contact 9 and a terminal 2, and a part of the round wire rod 8 is bent into a protruding shape to form a fixed contact 9 at the top thereof. The removed protruding portion 8c was embedded in the bottom plate portion 1a of the insulating case 1 in an inclined state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small push button switch suitable for taping packaging and automatic mounting.

[0002]

[Prior Art]

 This type of push button switch generally has an insulating case formed in a cylindrical shape with a bottom, a fixed contact exposed on the inner bottom surface of the insulating case, and a fixed contact that is led out from the fixed contact and protrudes to the outside of the insulating case. And a movable contact for contacting and separating a fixed contact in the insulating case. By pressing a band-shaped metal plate that has been pressed during insert molding, the band-shaped metal plate Each part is used as a fixed contact and a terminal. Then, when pressing force is applied to the movable contact that is held at a position separated from the fixed contact, both contacts come into contact and switch to the ON state, and when this pressing force is removed, the movable contact automatically returns to the initial position. It is configured so as to return to the off state. Specifically, by incorporating a so-called rubber contact in which a movable contact is provided on the ceiling surface of a rubber member molded in a substantially bowl shape, the top of this rubber contact is incorporated. There are widely known push button switches that are used to press and drive, and push button switches that use an inversion spring as a movable contact and press the inversion spring with a stem.

Since such push button switches are tape-packaged as shown in FIG. 5, a large number of them can be efficiently stored and stored in a batch, and can be easily supplied to an automatic mounting machine. That is, in the figure, the pushbutton switches, which are tape-wrapped in a row at a predetermined interval, have a long end made of thick paper or the like at the tip of the terminal 2 protruding downward from the insulating case 1. The carrier tape 3 is carried, and by folding the carrier tape 3 in a zigzag manner, a large number of push button switches can be efficiently stored and stored in a component storage case (not shown). When mounting on the printed circuit board, the pushbutton switch is taken out of the parts storage case with the tape packaged and supplied to the automatic mounting machine. First, the lead cutter (not shown) is used to connect the terminal 2 to the position of the chain line in FIG. The push button switch is separated from the carrier tape 3 by cutting with, and then the tip of the terminal 2 is attached to the concave tip surface of the lead guide pin 7 which is inserted into the terminal mounting hole 6 of the printed circuit board 5, as shown in FIG. By abutting and moving the lead guide pin 7 downward, the terminal 2 is inserted into the predetermined terminal mounting hole 6 and then the cutting and clinch blade (not shown) is used to cut and cut the terminal 2. By performing the bending process, the push button switch is attached to a predetermined position on the printed circuit board 5. Reference numeral 4 in the figure denotes a substantially bowl-shaped rubber contact incorporated in each push button switch, and a movable contact (not shown) is provided on the ceiling surface of the rubber contact 4 and the inside of the insulating case 1 is provided. A fixed contact (not shown) is provided on the bottom surface at a position facing the movable contact.

[0004]

[Problems to be solved by the device]

 By the way, when the push button switch of this kind is separated from the carrier tape 3 or attached to the printed board 5, the terminal 2 is cut using the lead cutter or the cut / clinch blade as described above. Since the terminal 2 made of a strip-shaped metal plate having a substantially rectangular cross section must be sheared by pushing the blade applied to the long side of the cross section along the short side, and inevitably a large shear force is required. In the cutting process of the terminal 2, the blade is severely worn, in other words, the blade has a short life, which has been a factor in increasing the cost of the push button switch.

Further, in the terminal 2 made of the strip-shaped metal plate, since it is not easy to align the cut surface of the terminal 2 with the concave tip surface of the lead guide pin 7, it is a factor that deteriorates workability in the mounting stage. It was.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to suppress a wear of a blade for cutting a terminal and to improve workability in a mounting stage. To provide at low cost.

[0007]

[Means for Solving the Problems]

 The above-mentioned object of the present invention is to provide an insulating case, a fixed contact formed by exposing a part of a metal member inserted during molding of the insulating case on an inner bottom surface of the insulating case, and a part of the metal member. A push button switch including a terminal protruding outward from the insulating case and a movable contact for contacting and separating from the fixed contact in the insulating case. Using a round wire rod, a part of the round wire rod is bent into a protruding shape to form the fixed contact, and the protruding shape portion excluding the fixed contact is inclined to the bottom plate portion of the insulating case. It is achieved by burying it in the closed condition.

[0008]

[Action]

 According to the above means, the terminal made of round wire can be cut with a comparatively small shearing force, so that wear of the blade is suppressed, and when the terminal made of round wire is cut by the lead cutter, the substantially center of the cut surface is sharpened. Therefore, it is easy to align the lead guide pin with the concave tip surface, and if the projecting portion of the round wire is inclined and embedded, the contact area with the insulating case increases, so that it can be firmly fixed.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing a manufacturing process of a push button switch according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 shows a completed state of the push button switch. It is a side view shown, and the same code | symbol is attached | subjected to the part corresponding to FIGS.

In FIGS. 1 to 3, the insulating case 1 of the push button switch is formed into a bottomed, substantially cylindrical shape. When the insulating case 1 is formed, a part of the insulating case 1 is bent into a convex shape and arranged in parallel. In addition, after inserting the two round wire rods 8 and molding, after bending, the terminal forming portion 8a protruding outward of the insulating case 8 is bent at a substantially right angle and the unnecessary portion 8b is cut off. Thus, the fixed contact 9 and the terminal 2 are obtained from each round wire 8. That is, in the finished push button switch, the portion of each round wire 8 exposed on the inner bottom surface of the insulating case 1 at the top of the convex portion 8c serves as the fixed contact 9 and extends outward of the insulating case 8. The protruding portion serves as the terminal 2, and the remaining portion of each round wire rod 8, that is, the convex portion 8c except the fixed contact 9, is embedded in the bottom plate portion 1a of the insulating case 1 in an inclined state. .. Further, a plurality of caulking bosses 1b are projected on the upper end surface of the insulating case 1, and the metal cover 10 is placed and fixed on the insulating case 1 by caulking these bosses 1b. The metal cover 10 prevents the stem 11 from falling off. Although not shown, a reversing spring functioning as a movable contact is housed inside the insulating case 1 so that when the stem 11 is driven by a predetermined stroke, the reversing spring reverses and contacts the fixed contact 9. It has become.

In this embodiment, since the hoop-shaped round wire material whose surface is covered with silver is used as the round wire material 8, good conductivity of the fixed contact 9 and the terminal 2 is guaranteed. At the same time, by inserting a large number of insulating cases 1 until they are taken out of the molding die, insert molding can be efficiently performed.

As described above, the push button switch thus completed is taping-wrapped in a line at a predetermined interval, and a long carrier tape carrying the terminal 2 is folded and folded to form a large number of parts in the component storage case. Individual push button switches can be stored and stored. In addition, when mounting on a printed circuit board, the pushbutton switch, which is still packaged in taping, is taken out from the parts storage case and supplied to the automatic mounting machine. First, a lead cutter is used to cut the terminal 2 to remove the pushbutton switch from the carrier tape. Then, the tip of the terminal 2 should be brought into contact with the concave tip surface of the lead guide pin and lead to the terminal mounting hole, and then the terminal 2 should be cut and bent using a cutting and clinch blade. By this, the push button switch is attached to a predetermined position on the printed circuit board.

Now, when the fixed contact 9 and the terminal 2 of the push button switch are formed by using the round wire 8 as in the above-described embodiment, the fixed contact and the terminal are formed by pressing the strip-shaped metal plate. In addition to reducing the material cost and processing cost, the terminal 2 made of round wire can be cut with a comparatively small shearing force, so a terminal cutting blade (lead cutter or cut / clinch blade) used at the mounting stage. ) Wear is suppressed, the life of the blade is extended correspondingly, and the cost of the push button switch can be reduced. Moreover, when the terminal 2 made of round wire is cut with a lead cutter, the substantially center of the cut surface is sharpened, and if this sharp tip is brought into contact with the concave tip surface of the lead guide pin, the terminal 2 and the lead guide pin will be easily formed. Since the positions can be adjusted, workability at the mounting stage can be expected to improve.

In addition, as in the above-described embodiment, the round wire 8 is previously bent to form the convex portion 8c, and when the insulating case 1 is molded, the convex portion 8c is inside the bottom plate portion 1a. If the round wire rod 8 is inserted so as to incline with, the contact area of the round wire rod 8 with the insulating case 1 increases, so that even if it is a wire rod, it can be firmly fixed, so that even if an external force is applied, it will be convex. There is no concern that the strip-shaped portion 8c will rattle the insulating substrate 1.

FIG. 4 is a plan view showing a manufacturing process of a push button switch according to another embodiment of the present invention, in which parts corresponding to those in FIG. 1 are designated by the same reference numerals.

That is, in the push button switch shown in FIG. 4, the shape of the convex portion 8c of the round wire rod 8 is different from that in FIG. 1, and the bent portion is rounded, so that the round wire rod to be performed before the insertion is performed. The bending process of No. 8 is easier than that of the previous embodiment.

In each of the above-mentioned embodiments, a push button switch of a type incorporating a reversing spring functioning as a movable contact is illustrated, but other types of push button switches such as rubber contacts are also incorporated. Needless to say, the present invention is applicable.

[0019]

[Effect of the device]

 As described above, according to the present invention in which the round wire rod is used as the base material of the fixed contact and the terminal, and the protruding shape portion of the round wire rod is inclined and embedded in the insulating case, the round wire rod has a relatively small shearing force. Since the blade for cutting the terminal is prevented from being worn, the terminal made of round wire can be easily aligned with the concave tip surface of the lead guide pin, improving workability at the mounting stage. The projecting shape ensures a sufficient contact area with the insulating case, so the inserted round wire can be firmly fixed, and the cost can be reduced by using the round wire instead of the strip-shaped metal plate. Also, various excellent effects such as reduction of machining cost can be achieved.

[Brief description of drawings]

FIG. 1 is a plan view showing a manufacturing process of a push button switch according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a side view showing a completed state of the push button switch.

FIG. 4 is a plan view showing a manufacturing process of a push button switch according to another embodiment of the present invention.

FIG. 5 is a side view for explaining taping packaging of a push button switch.

FIG. 6 is a partial cross-sectional side view for explaining work for mounting the push button switch.

[Explanation of symbols]

 1 Insulation case 1a Bottom plate 2 Terminal 5 Printed circuit board 6 Terminal mounting hole 7 Lead guide pin 8 Round wire 8c Convex part (protruding part) 9 Fixed contact

Claims (2)

[Scope of utility model registration request] 1. An insulating case, a fixed contact formed by exposing a part of a metal member inserted during molding of the insulating case to an inner bottom surface of the insulating case, and a part of the metal member of the insulating case. In a push button switch provided with a terminal protruding outward and a movable contact for contacting with and separating from the fixed contact in the insulating case, a circular wire rod having a substantially circular cross section is used as the metal member. Part of the wire rod is bent into a protruding shape to form the fixed contact at the top, and the protruding portion excluding the fixed contact is embedded in the bottom plate portion of the insulating case in an inclined state. And push button switch. 2. The push button switch according to claim 1, wherein the surface of the round wire is covered with silver.