JPH0749701Y2 - Push button switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a push button switch used in various input devices such as a computer and a word processor.

[Prior Art] FIGS. 4 and 5 are explanatory views of a conventional example. FIG. 4 is a sectional view of a main part of a push button switch, and FIG.
The OFF state is shown, and the (b) figure shows the ON state. FIG. 5 is a perspective view of the movable contact.

In the drawings, 1 is a lower case, 2 is an upper case, 3 is a stem, and a projecting portion 6 that can be inserted into an insertion hole 5 of the upper case 2 is provided on the upper surface of the base portion 4 and the lower case is on the lower surface of the base portion 4. 1
A recessed hole 8 is provided to support the upper end of the spring 7 disposed between and. Further, an inclined portion 10 for operating a movable contact 9 described later is formed on the side surface of the base portion 4.

Reference numeral 11 denotes a fixed contact, which is made of, for example, a metal plate having good conductivity such as brass, and the terminal (not shown) integrally formed with the fixed contact 11 is inserted into the through hole of the lower case 1 so as to be attached to the lower case 1. It is fixed.

The movable contact 9 is made of a thin metal plate having excellent elasticity such as stainless steel or phosphor bronze.
12, a connecting portion 13 vertically extending downward from the substantially central portion of the base portion 12, a contact portion 14 formed by folding the tip end portion of the connecting portion 13 upward, and formed on both left and right sides of the contact portion 14. The elastic arm 15 provided with the stem abutting portion 15a and the mounting portion 16 are integrally formed. The movable contact 9 has a terminal (not shown) vertically extending from one end of the base portion 12 inserted into a through hole of the lower case 1 and a tip portion of the movable contact 9 projecting out of the lower case 1. It is fixed to.

In the standby state before the protruding portion 6 is pressed, the push button switch, as shown in FIG.
Is raised to the uppermost position by the spring 7, and since the inclined portion 10 of the stem 3 is in pressure contact with the stem contact portion 15a of the movable contact 9, the contact 14a of the contact portion 14 of the movable contact 9 is self It is separated from the fixed contact 11 by elasticity.

When the protruding portion 6 is pressed from this state and the stem 3 is lowered against the elasticity of the spring 7, as shown in FIG. 4 (b), the stem contact of the movable contact 9 is advanced along the inclined portion 10 of the stem 3. When the contact part 15 and the contact part 14 move to the fixed contact 11 side and the stem 3 descends to the vicinity of the lowermost part, the contact 14a of the contact part 14 of the movable contact 9 and the fixed contact 11 are connected. When the pressing force of the stem 3 is released, the stem 3 rises due to the restoring force of the spring 7 and returns to the state of FIG. 4 (a), and the contact 14a of the movable contact 14 and the fixed contact 16 are connected. It will be released again.

[Problems to be Solved by the Invention] However, the push button switch described above is a connecting portion of the movable contact 9.
Since the bent portion A between the contact portion 13 and the contact portion 14 floats from the bottom surface of the lower case 1, the connecting portion 13 of the movable contact 9 moves as shown by an arrow B when the stem is moved up and down.

In this case, the contact positions of the movable contact 9a and the fixed contact 11 are not stable, which causes bounce. In the worst case, two or more ON points appear and the stem 3 is pressed and returned once. However, there was a problem that the ON / OFF operation of 2) electrically showed ON or OFF more than twice.

The present invention is a device for solving the above-mentioned problems, and an object of the present invention is to operate the switch by operating the stem.
An object of the present invention is to provide a push-button switch that can prevent bounce or ON / OFF switching more than once at N / OFF switching.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is directed to joining and
An integrated upper case and lower case, movable contacts and fixed contacts provided opposite to the lower case, a stem slidably provided with respect to the upper case and lower case, and this stem A push button switch having a spring interposed between the lower case and the lower case and biasing the stem upward, wherein the movable contact has a base portion fixed to the lower case and a connection extending vertically from the base portion. A contact portion folded back to the connecting portion via the bent portion, and elastic arms having stem contact portions on both sides of the contact portion, the bent portion is brought into contact with the lower case. It is characterized in that a built-up portion forming a taper surface is provided for crimping.

[Operation] The push-button switch of the present invention has the above-mentioned structure, and the movable contact has a taper of the built-up portion in which the bent portion between the connecting portion and the contact portion which is hung from the base portion is provided in the lower case. Since it is fixed by abutting against the surface, the contact part and the elastic arm move but the connecting part does not move when the stem is pressed or returned. Therefore, the inconvenience of bouncing when switching the contacts due to movement of the stem or repeating ON / OFF twice or more is eliminated.

[Embodiment] An embodiment of the present invention will be described below with reference to the attached drawings.

1 to 3 are explanatory views of an embodiment of the present invention, FIG. 1 is a sectional view of a push button switch, and FIG. 2 is an operation explanatory view.
The figure shows the switch contacts in the OFF state, and the (B) figure shows the ON state. FIG. 3 is a perspective view of the movable contact. The same parts as those of the conventional example shown in FIGS. 4 and 5 are designated by the same reference numerals.

In the drawings, 1 is a lower case, 2 is an upper case, 3 is a stem, and a projecting portion 6 that can be inserted into the insertion hole 5 of the upper case 2 is projected on the upper surface of the base portion 4, and the lower case 1 is on the lower surface of the base portion 4.
A recessed hole 8 is provided to support the upper end of the spring 7 disposed between and. Further, an inclined portion 10 for operating a movable contact 9 described later is formed on the side surface of the base portion 4.

Reference numeral 11 denotes a fixed contact, which is made of a metal plate having good conductivity such as brass, and is fixed to the lower case 1 with the terminal 11a integrally formed with the fixed contact 11 being inserted into the through hole of the lower case 1. There is.

The movable contact 9 is made of a highly conductive metal plate having excellent elasticity such as stainless steel or phosphor bronze.
And a connecting portion that extends downward from the substantially central portion of the base portion 12.
13, a contact portion 14 formed by folding the tip of the connecting portion 13 upward, an elastic arm 15 having stem contact portions 15a formed on both left and right sides of the contact portion 14, and a mounting portion 16. It is formed integrally. The movable contact 9 is fixed to the lower case 1 with the terminal 9a vertically extending from one end of the base 12 inserted into the through hole of the lower case 1 and the tip of the terminal 9a protruding from the lower case 1. There is.

Reference numeral 17 denotes a tapered surface 17a formed at a corner of the bottom surface of the lower case 1.
In the built-up portion for forming the above, the bent portion A between the end portion of the connecting portion 13 of the movable contact 9 and the contact portion 14 is formed on the taper surface 17a of the built-up portion 17.
Are abutted and fixed.

In this push-button switch, in the standby state before the protrusion 6 is pressed, the stem 3 is lifted to the uppermost position by the spring 7 as shown in FIG. Since the movable contact 9 is pressed against the stem contact portion 15 of the movable contact 9, the contact portion 14a of the contact portion 14 of the movable contact 9 is separated from the fixed contact 11 by its own elasticity.

From this state, the protruding portion 6 is pressed, the stem 3 is lowered against the elasticity of the spring 7, and when the inclined portion 10 of the stem 3 exceeds the stem contact portion 15a, the bent portion A and the buildup portion 17 are separated from each other. When the stem contact portion 15a and the contact portion 14 of the movable contact 9 move to the fixed contact 11 side with the contact portion as the fulcrum and the stem 3 descends to the vicinity of the lowermost portion, the contact 14a of the contact portion 14 of the movable contact 9 And the fixed contact 11 are connected. Then, when the pressing force of the stem 3 is released, the stem 3 rises due to the restoring force of the spring 7, and the inclined portion 10 of the stem 3 comes into pressure contact with the stem contact portion 15 of the movable contact 9 (a) in FIG. The state is restored, and the connection between the contact 14a of the movable contact 14 and the fixed contact 11 is released again.

The push-button switch of the present invention has the above-described structure, and the bent portion A of the movable contact 9 is brought into contact with the taper surface 17a of the built-up portion 17 of the lower case 1 so that the stem 3 is pressed and returned. The contact portion 14 and the elastic arm 15 move about the contact portion between the bent portion A and the tapered surface 17a of the overlay portion 17, but the connecting portion 13 does not move. Therefore, stem 3
Bounce when switching contacts due to movement of
Never turn ON / OFF more than once. If the movable contact 9 has the structure shown in FIG.
When the stem abutting portion 15a of the elastic arm 15 is pressed by the 10, the stem abutting portion 15a is undesirably bent, and there is a drawback that it is not possible to maintain accurate ON / OFF timing of the switch. As shown in FIG. 3, by inserting a diamond-shaped rib 18 at the boundary between the stem abutting portion 15a and the elastic arm 15, it is possible to prevent undesired bending and to ensure accurate switching.
ON / OFF timing can be retained.

[Advantage of the Invention] According to the present invention, as described above, the bent portion of the movable contact is brought into contact with the tapered surface of the built-up portion of the lower case, and the contact portion and the elastic arm are in contact with the bent portion and the tapered surface. It is possible to move with the part as a fulcrum, but since the movement of the connecting part is blocked,
The inconvenience of bouncing when switching the contacts due to the movement of the stem and repeating ON / OFF twice or more has been resolved.

[Brief description of drawings]

1 to 3 are explanatory views of an embodiment of the present invention, FIG. 1 is a sectional view of a push button switch, and FIG. 2 is an operation explanatory view.
The figure shows the switch contacts in the OFF state, and the (B) figure shows the ON state. FIG. 3 is a perspective view of the movable contact. FIGS. 4 and 5 are explanatory views of a conventional example. FIG. 4 is a cross-sectional view of a push button switch, (a) shows the contact of the switch in the off state, and (b) shows the on state. Show. FIG. 5 is a perspective view of the movable contact. 1 ... Lower case, 2 ... Upper case, 3 ... Stem, 7 ...
… Spring, 9 …… Movable contact, 10 …… Inclined part, 11 ……
Fixed contact, 12 …… Base part, 13 …… Coupling part, 14 …… Contact part,
15: Elastic arm, 15a: Stem contact part, 17: Overlay part, 1
7a ... tapered surface, 18 ... rib.

Claims (1)

[Scope of utility model registration request] 1. An upper case and a lower case which are joined and integrated with each other, a movable contact and a fixed contact which are provided to face the lower case, and slidably with respect to the upper case and the lower case. In a push button switch provided with a stem and a spring that is interposed between the stem and the lower case and biases the stem upward, the movable contact has a base portion fixed to the lower case,
The lower case is provided with a connecting portion hung from the base portion, a contact portion folded back to the connecting portion via a bending portion, and elastic arms having stem contact portions on both sides of the contact portion. Is a push-button switch, characterized in that it is provided with a built-up portion having a tapered surface for abutting the bent portion.