KR910003721Y1 - Push bottom switch - Google Patents

Abstract

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Description

Push button switch

1 is a cross-sectional view of the push button position according to an embodiment of the present invention.

2 is a bottom view of the lower case.

3 is an exploded perspective view.

4 is a cross-sectional view showing the assembly structure between the stem and both cases.

5 is a cross-sectional view of a conventional push button switch.

* Explanation of symbols for main parts of the drawings

25: lower case 26: upper case

27: stem 34: guide rail

36: solvent preventing protrusion 37: bottom

The present invention relates to a push button switch used in various input devices such as a computer or a word processor.

5 shows an example of this type of push button switch which is well known in the art. 5 is a cross-sectional view of a conventional push button switch. As shown in this figure, this push button is mainly composed of the lower case 1, the upper case 2, the fixed contact 3, the movable contact 4, the stem 5 and the anti-elastic piece 6 have.

The lower case 1, the upper case 2 and the stem 5 are formed of a synthetic resin having excellent insulation such as polyacetal.

Among these members, the lower case 1 is formed in a basket shape with an upper surface open, and a cylindrical guide protrusion 7 is installed upright in the center of the bottom surface, and is fixed to the fixed contact setting portion adjacent to the guide protrusion 7. 8) Moreover, the movable contact setting part 10 is formed between this fixed contact setting part 8 and one side wall 9. As shown in FIG. The bottom of the electric fixed contact setting section 8 is provided with a through hole 11 for inserting the fixed contact terminal described later to the outside, and the movable contact terminal to be described later on the bottom of the movable contact setting section 10 A through hole 12 for inserting is provided.

On the other hand, the upper case 2 is formed in a basket shape having an open lower surface, and an insertion hole 13 for inserting the stem 5 to be described later is formed in the center of the upper surface, and the lower case 1 is provided on the side. The engagement end and the engagement engaging piece are modified so that the upper and lower cases 1 and 2 are integrated by engaging these.

As for the stem 5, the protrusion 15 which can be inserted into the insertion hole 13 protrudes from the upper surface of the base 14 which is wider than the insertion hole 13 provided in the upper case 2, and A shaft portion 16 inserted into the cylindrical guide protrusion 7 protruding from the lower case 1 protrudes from the lower surface of the base 14.

The stem 5 inserts the shaft portion 16 into the guide protrusion 7 protruding from the lower case 1, and further protrudes the protrusion 15 from the insertion hole 13 formed in the upper case 2. It protrudes into and is built in the space formed by the lower case 1 and the upper case 2.

The return spring 6 is attached to the outer circumferential portion of the guide protrusion 7 protruding from the lower case 1, and biases the electric stem 5 upward.

The fixed contact 3 is a slightly conductive, electrically conductive metal plate, and the contact portion 17 and the fixed contact terminal 18 provided to be modified downward from one side of the contact portion 17 are integrally formed.

The fixed contact 3 projects the fixed contact terminal 18 to the outside through the through hole 11, and fits the electric contact portion 17 to the fixed contact setting portion 8 formed on the lower case 1. It is fixed to the lower case 1 by this.

The movable contact 4 is excellent in elasticity and is made of a metal thin plate, and the contact portion 21 is formed by folding the upper portion of the wide base 20 downwardly downward.

Moreover, the stem contact part 23 extended in the inclined part 22 of the electric stem 5 is provided in the both sides of this contact part 21 protrudingly. In addition, the movable contact terminal 24 is installed vertically downward on one side of the base 20. The movable contact terminal 24 protrudes to the outside through the perforation 12, and is fixed to the lower case 1 by fitting the base 20 to the movable contact setting portion 10 formed on the lower case 1. do. And this movable contact 4 is urged in the direction which always contacts with the stationary contact 3 by its elasticity.

In the conventional push button switch described above, the stem 5 is raised to the top by the return spring 6 in the standby state before the protrusion 15 is pressed, and the inclined portion 22 formed on the stem 5 Since the stem contact portion 23 of the movable contact 4 comes into contact with the protruding portion, the contact portion 21 of the movable contact 4 is isolated from the contact portion 17 of the fixed contact 3.

When pressing the protrusion 15 and lowering the stem 5 against the elastic force of the return spring 6, the stem contact portion 23 of the movable contact 4 is placed on the inclined portion 22 formed on the stem 5. Therefore, the contact portion 21 of the movable contact 4 and the contact portion 17 of the fixed contact 3 are moved to the stem 5 side (the fixed contact 3 side) and the stem 5 descends to the lowermost vicinity. ) Is connected.

When the pressing force applied to the stem 5 is released, the stem 5 is raised by the elastic force of the return spring 6, and the connection between the movable contact 4 and the fixed contact 3 is released again.

By the way, this type of push button is used when the lower case (1) is placed on the entire printed circuit board, but because the lower case (1) is formed flat, the lower surface of the stem (5) by pressing the stem (5) There was a problem that a large impact sound was generated when the lower case 5 abuts the inner bottom.

In addition, the fixed contact terminal 18 and the movable contact terminal 24 protruding from the lower case 1 are soldered to the printed circuit board. However, soldering of the solder to the fixed contact terminal 18, the movable contact terminal 24, etc. is performed during this soldering. Solvents are applied for good. However, since the solvent has good wettability to the metal surface, it is easy to adhere to the contact portions 17 and 21 along the surface of the fixed contact point 3 or the movable contact point 4. In addition, since the solvent is an insulating material, there is a problem that contact failure occurs when attached to the contact portions 17 and 21.

The present invention has been made to solve the problems of the prior art, the purpose of which is to prevent the impact sound of the stem and at the same time to prevent the intrusion of the solvent into the contact portion, and to prevent the rattling of the stem in a thin To provide a push button switch.

In order to achieve the above object, the present invention provides a solvent preventing protrusion provided on a lower surface of an electric case with a case and a stem perturbation part (sliding part) provided in the case and a stem installed to freely slide the stem perturbation part. The lower part of the electrical stem perturbation part which the whole system abuts protrudes downward from the lower surface of the electrical case, and at the same time, the protrusion amount is reduced at the lower surface of the electrical projection.

Since the distance to the contact portion of the terminal can be lengthened by providing a solvent preventing protrusion on the bottom surface of the case as described above, the solvent does not invade the terminal at the time of soldering, for example, autodeep, and adversely affects the contact portion. There is no work. In addition, when the stem lower end contacts the inner bottom face of the case by pressing the stem, the lower case is in point contact with the protrusions instead of the surface contact with the printed board, so that the impact sound due to the stem press can be reduced. Moreover, since the stem perturbation part is mounted downward, the stem perturbation can be relatively thin while maintaining the perturbation stroke as in the prior art, and the stem is stably supported because of the long sliding part of the stem perturbation part. You can prevent the flutter.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

1 is a sectional view of the main part of the push button switch according to the present invention, 2 is a bottom view of the lower case, 3 is an exploded perspective view, 4 is a main sectional view showing the perturbation state of the stem and both cases. As shown in this figure, the push button switch of the present invention is a fixed contact made of a lower case 25, an upper case 26, a stem 27, and a conductive metal material mainly made of synthetic resin having excellent insulation. (28) and the movable contact (29) and the return spring (20) which always biases the electric stem (27) upward.

As shown in FIG. 3, the lower case 25 is formed in a basket shape with an open top surface, and the holding body 32 is formed in accordance with the inner surface of one side wall 31, and the one side wall ( An engaging end portion 33 for attaching and detaching the upper case 26 to be described later can be freely formed on the outer surface of the upper surface 31), and the opposite side of the side wall adjacent to the one side wall 31 will be described later. Guide rails 34, which are stem perturbations for guiding the stems 27, are formed.

On the upper surface of the electric retainer 32, a movable contact setting portion 34 on a shallow groove is provided along the inner surface of the side wall 31, and a fixed contact setting portion 35 on a shallow groove is similarly formed on the inside thereof. have. A hole for opening the movable contact terminal of the movable contact 29 to be described later is opened at the bottom of the electric movable contact setting unit 34, and the fixed contact 28 to be described later is fixed to the electric fixed contact setting unit 35. A hole for opening the contact terminal to the outside is opened.

Moreover, as shown in FIG. 2, the lower surface of the lower case 25 is provided with the protrusion 36 for solvent prevention. In addition, the stem 27 guided by the guide rail 34 projects downward from the lower surface of the lower case 25 of the bottom part 37 of the lower case 24, and at the same time reduces the amount of protrusion from the electric projection 36. .

The upper case 26 is formed in a flat plate shape on the upper surface of the electrical lower case 25 as shown in FIG. 3, and an insertion hole 37 for inserting the stem 27 to be described later in the center is provided. An elastic piece 38 is provided on the opposite side of the insertion hole 37. In addition, a pair of positioning protrusions 39 are vertically provided on the lower surface of the upper case 26 near the insertion hole 37 so as to be in contact with the upper inner surface of the electric guide rail 34. The lower edge of the case 26 is provided with a protrusion 40 fitting the inner surface of the upper edge of the lower case 25 and a protrusion 41 protruding from the protrusion 40.

In addition, the lower surface of the upper case 26 is provided with a projection 42 inserted into the end portion of the fixed contact 28 to be modified.

Moreover, the engaging piece 43 which engages with the engagement end part 33 formed in the electrical lower case 26 is perpendicular to the predetermined part of the side of the upper case 26. As shown in FIG.

The lower case 25 and the upper case 26 are integrated by engaging the engaging piece 43 of the upper case 26 with the engaging end 33 of the lower case 25.

As shown in FIG. 3, the stem 27 has a protrusion 45 protruding from the insertion hole 37 of the upper case 26 protruding from the insertion hole 37 into the upper surface of the wide base 44. It is provided and, on the surface opposite to the guide rail 34 of the electric lower case 25 of the four sides constituting the base 44, the sub-plate consisting of two protruding plates fitted to the guide rail 34 At the same time as the eastern part 46 is protruded, the elastic piece 47 is installed in the center upper part. In addition, in the upper part of the side surface 44 of which the perturbation part 46 was provided, the groove 48 is provided by two protrusions, and the elastic piece 38 of the upper case 26 is located. On the other hand, the lower surface of the base 44 is provided with a bleeding blood 49 supporting the upper end of the return spring 30 disposed between the lower case 25.

Moreover, the inclination part 50 for operating the movable contact 29 is formed in the side surface which opposes the electric fixed contact setting part 35 of the base 44. As shown in FIG.

The stem 27 aligns the inclined portion 50 with the perturbation portion 46 toward the guide rail 34 of the lower case 25 toward the electric retaining body 32 side, and the protrusions 45 are raised upward. It protrudes outward from the insertion hole 37 of the case 26, and is built in the space formed by the lower case 25 and the upper case 26. As shown in FIG.

The return spring 30 is opened between the bottom face of the lower case 25 and the scem 27, and always biases the stem 27 upward.

The fixed contact 28 is, for example, a conductive plate made of a conductive metal such as brass, and the like, and the contact portion 52 and the contact portion 52 which are installed vertically downward from a substantially central portion of the horizontal base 51 and the base 51. The anti-vibration wall 53 formed to be bent to surround both sides and the fixed contact terminal 54 vertically installed downward from one side of the electric appliance 51 and the reinforcement group 54a vertically installed downward from the other side are integrally formed. The clad 52a is formed almost at the center of the electrical contact portion 52.

Moreover, the contact part 52 is bent and the edge part 55 in which the protrusion 42 of the upper case 26 is inserted is formed.

This fixed contact 28 inserts the electrical fixed contact terminal 54 into the through-hole of the lower case 25, as shown in FIG. 1, and sets the electrical contact part 52 to the fixed contact of the lower case 25. It is attached to the lower case 25 by fitting to the part 35.

The movable contact 29 is made of a conductive metal sheet having excellent elasticity such as stainless steel, phosphorous, or the like. The movable contact 29 is vertically installed on the base 56 and the one end of the base 56 having a horizontal width. The contact terminal 57 and the reinforcement group 58 installed vertically downward from the other end and the connecting portion 59 vertically installed downward from the center of the electrical appliance 56, and the front end of the connecting portion 59 are folded upward. The contact portion 60, the stem contact portion 61 formed on the left and right sides of the contact portion 60, and the attaching portion 62 which is folded downward from the center upper edge of the base 56 are integrally formed. .

As shown in FIG. 2, this movable contact 29 inserts the electrically movable contact terminal 57 into the through hole of the lower case 25, and protrudes the tip part out of the lower case 25, and the electric base ( 56 is attached to the lower case 25 by fitting the movable contact setting section 34.

The operation of the embodiment configured as described above is as follows.

This push button switch is the stem 27 is raised to the top by the return spring 30 in the standby state before the projection 45 is pressed, the stem 27 is the stem contact portion of the movable contact 29 Since it is press-contacted with 61, the contact part 60 of the movable contact 29 is isolate | separated from the contact part 52 of the stationary contact 28 by magnetic elasticity. When pressing the projection 45 and lowering the stem 27 against the elastic force of the return spring 30, the stem contact portion 61 and the contact portion of the movable contact 29 along the inclined portion 50 of the stem 27 The contact portion 60 of the movable contact 29 and the contact portion 52 of the fixed contact 28 are disconnected when the 60 moves toward the fixed contact 28 and the stem 27 descends to the uppermost position. Is done.

When the pressing force is released to the stem 27, the stem 27 is raised by the elastic force of the return spring 30, and the connection between the movable contact 29 and the fixed contact 28 is released again.

And the bottom part of the lower case 25 which the lower end of the stem 27 abuts protrudes downward from the lower surface of the lower case 25, and the stem 27 can move downward compared with the conventional push button switch.

Therefore, when the stroke of the stem 27 is made the same as the conventional one, the height can be lowered and the rattling of the stem can be prevented.

Moreover, the solvent prevention protrusion 36 on the lower surface of the lower case 25 lengthens the distance to the contact parts 52 and 60 of a terminal, and prevents intrusion of a solvent.

In addition, when the stem 27 is pressed by the solvent preventing projection 36, when the lower end of the stem 27 abuts on the inner bottom surface of the lower case 25, the lower case 25 is not in surface contact with the printed circuit board. Because of the point contact, the pressing force of the stem 27 is caught by the four projections 36, so that the impulsive sound can be reduced.

As described above, the push button switch of the present invention can prevent the intrusion of the solvent by the solvent preventing projection, and does not adversely affect the contact portion. In addition, when the stem is pressed and the stem lower end abuts the inner face of the face, the lower case is point contacted with the printed circuit board instead of face contact, so that the impact sound caused by stem pressure can be reduced. In addition, since the stem perturbation part is draped downward, the stem perturbation can be relatively thin while maintaining the perturbation stroke as in the prior art, and the stem is stably supported by the stem perturbation part, so that the stem can be lengthened. You can prevent the flutter.

Claims (1)

The case and the stem perturbation part installed in this case, the stem installed in this stem perturbation part to move freely, and the solvent prevention protrusion provided in the lower surface of an electrical case are provided, A push button switch, characterized in that it protrudes downward from the bottom and at the same time reduces the electrical projection.