JP3882219B2 - Push switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a push switch used in various electronic devices.
[0002]
[Prior art]
A conventional push switch will be described with reference to FIGS.
[0003]
In the exploded perspective view of FIG. 7 and the same cross-sectional view of FIG. 8, 1 is a molded resin case formed in a box shape having an opening on the upper surface, a fixed terminal 2 having a fixed contact 2A on the inner bottom surface thereof, A fixed terminal 3 having a fixed contact 3A is fixed by insert molding.
[0004]
4 is a contact piece made of a conductive thin metal plate having elasticity, and has movable contact portions 4C and 4D at the tip of an arm that is bifurcated from the vicinity of a fulcrum portion 4B whose end portion is bent upward. A connecting portion 4E is provided on the movable contact portions 4C and 4D side of the U-shaped bent portion 4A, and 10 is a rod-shaped operating body made of a molded resin. An operation portion 10B that is held so as to be movable up and down and protrudes above the case 1 is provided above, and the lower portion is between the upper arm portion 4F from the vicinity of the fulcrum portion 4B of the contact piece 4 to the substantially U-shaped bent portion 4A. And a pressing portion 10A that presses the bifurcated connecting portion 4E protrudes laterally.
[0005]
Reference numeral 11 denotes a cover fixed to the attachment frames 11C on both sides so as to cover the opening of the case 1, and the operation body 10 is held in the central hole 11A so as to be movable up and down. A supporting wall 11B that rotatably supports the fulcrum portion 4B of the piece 4 at the joint portion with the case 1 is provided at the lower end portion.
[0006]
In addition, a curled portion bent in an arc shape is provided in the approximate center of the connecting portion 4E of the contact piece 4 that contacts the pressing portion 10A of the operating body 10.
[0007]
Next, the operation of the conventional push switch configured as described above will be described.
In the normal state shown in FIG. 8, when the operating body 10 is pushed down, the connecting portion 4E of the contact piece 4 that is in contact with the pressing portion 10A below the operating body 10 is pushed downward, and the contact piece 4 is centered on the fulcrum portion 4B. The movable contact portion 4C slides on the fixed contact 3A, and the movable contact portion 4D shifts from the insulating portion on the bottom surface of the case 1 to the fixed contact 2A to enter the state shown in FIG. And the fixed terminal 3 are connected.
[0008]
At this time, the operating body 10 operates while being guided by the thickness of the hole 11 </ b> A in the center of the cover 11, and when the force that pushes down the operating body 10 is removed, the operating body 10 is moved by the elastic return force of the contact piece 4. When pushed up, the original state of FIG. 8 is restored.
[0009]
[Problems to be solved by the invention]
However, in recent years, this type of push switch has been frequently used in a surface mounting method, so that an operation unit that protrudes above the cover 11 when sucked by the suction nozzle 12 of the automatic mounting machine as shown in FIG. 10B must be in the approximate center of the top surface of the push switch, while the contact piece 4 that requires elasticity must be as long as possible in a limited space in order to keep the spring constant low. The center position of the operating portion 10B of the operating body 10 and the position of the pressing portion 10A that presses the connecting portion 4E of the contact piece 4 are configured to be eccentric.
[0010]
In the conventional configuration, since the tilt of the operating body 10 can be prevented only by the thickness of the cover 11, when the thickness of the cover 11 is reduced, the operating body 10 becomes as shown in FIGS. 11 (a) and 11 (b). Rotational moment is generated between the operation unit 10B and the pressing unit 10A, and the operation body 10 is tilted. The suction nozzle 12 and the operation unit 10B at the time of mounting interfere with each other to cause a suction failure, or due to twisting or tilting. Problems such as poor operational feel and variations in contact ON position accuracy have occurred.
[0011]
Further, when the thickness of the cover 11 is increased in order to suppress the tilt of the operating body 10, the switch body becomes large, which is an obstacle to miniaturization.
[0012]
SUMMARY OF THE INVENTION The present invention solves such a conventional problem, and an object thereof is to provide a push switch that is free from adsorption failure at the time of automatic mounting, is small, has a stable contact ON position accuracy, and has an excellent operation feeling. Is.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is provided with a substantially T-shaped inclination restricting portion on the opposite side of the pressing portion of the operating body, and a guide portion on which the restricting portion can move up and down is provided on the cover.
[0014]
Thereby, the said control part is guided by the guide part, and moves up and down, the rotation moment which generate | occur | produces by eccentricity of an operation part and a press part can be suppressed, and the inclination of an operation body can be prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, a pair of fixed contacts each integrally forming a terminal are insert-molded such that a pair of fixed contacts are exposed on the inner bottom surface, and a resin box-shaped case having an upper surface opening and a fulcrum portion A bifurcated branch extends from one end, and is formed in a U shape with a middle portion as a bent portion and a pair of movable contacts elastically contacting the fixed contact at the other end. a contact piece made of a metal plate having elasticity provided with a connecting part to be connected in operation point, set digit bar-shaped portion of the pressing portion on the lower side of pressing the contact piece in contact with the connecting portion of the contact piece a molding resin of the operating tool made of, the rod-like portion of the operating body is provided with a support wall for supporting and positioning the contact with the fulcrum portion as a fulcrum of the bore contact and the contact piece which projects to the outside flat Formed through the attachment frame portions provided at both ends. Ri Do from the molded resin cover which is coupled to the upper surface of the case, in the direction opposite to the pressing body at the lower end side of the rod-like portion of the operating body, protrudes with its tip Hosohaba portion are each laterally A position-regulating restricting portion having a substantially T-shape is provided, and extends downward from the hole of the cover along the inner periphery thereof, so as to sandwich the narrow portion of the operating body from both sides. A push switch in which the operation body is restricted from tilting when the tip inner side surface of the substantially T-shaped restriction portion hits the columnar portion. even if incline the operating body by the pressing portion for pressing is eccentric to the connecting portion, the regulating portion which is formed on the operating member is restricted by the guide portion comprising a hole and a columnar portion formed in a bar, This has the effect that the operating body does not tilt.
[0017]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, the same components as those in the conventional example are denoted by the same reference numerals and description thereof is omitted.
[0018]
FIG. 1 is an exploded perspective view of the push switch according to the embodiment, and FIG. 2 is a sectional view thereof. In FIG. 1, 1 is a box-shaped case made of molded resin having an opening on the upper surface, The fixed terminal 2 having the fixed contact 2A and the fixed terminal 3 having the fixed contact 3A are fixed by insert molding as in the conventional example, and 4 is a contact piece made of an elastic metal thin plate, and the end portion is A fixed contact 3A and movable contact portions 4C and 4D elastically contacting the bottom surface of the case 1 are respectively provided at the tip of the fulcrum portion 4B bent upward and bifurcated. The substantially U-shaped bent portion 4A It is the same as that of the conventional example that the connecting portion 4E that connects the two branches is provided on the movable contact portions 4C and 4D side.
[0019]
Reference numeral 5 denotes an operating body made of a molded resin. As shown in the top view of FIG. 3A and the front view of FIG. 3B, the connecting portion 4E of the contact piece 4 is formed on the lower end side of the rod-shaped portion 5A. Although it has the press part 5B which presses is similar to the conventional example, it has a substantially T-shaped restricting part 5C on the opposite side.
[0020]
Reference numeral 6 denotes a cover made of molded resin that covers the opening of the case 1, and is a flat plate as shown in the top view of FIG. 4 (a), the front sectional view of FIG. 4 (b), and the side sectional view of FIG. At the center of the part, there is a hole 6A for penetrating and holding the rod-like part 5A of the operating body 5 and two parallel columnar parts 6B extending downward along the inner periphery thereof. A vertically moving guide portion is formed.
[0021]
A support wall 6C extended along the inside of the side wall of the case 1 below the flat plate portion of the cover 6 forms a support portion for the fulcrum portion 4B of the contact piece 4, and mounting frames 6D for the case 1 are provided on both sides of the flat plate portion. It has the same as the conventional example.
[0022]
Then, the relationship between the operating body 5 and the cover 6 in the state assembled to the push switch is as follows. As shown in the cross-sectional view of FIG. 5, the narrow portion between the rod-shaped portion 5A of the operating body 5 and the substantially T-shaped regulating portion 5C. The parallel columnar portion 6B of the cover 6 is inserted so as to sandwich the width portion 5D from both sides.
[0023]
Next, the operation of the thus configured push switch of the present invention will be described.
[0024]
In the normal state shown in FIG. 2, when the operating portion 5E of the operating body 5 is pushed down, the connecting portion 4E of the contact piece 4 that is in contact with the pressing portion 5B of the operating body 5 is pressed downward, and the contact piece 4 becomes the fulcrum 4B. When the movable contact portions 4C and 4D connect between the fixed terminals 2 and 3 and the force that pushes down the operating body 5 is removed, the contact piece 4 The operation body 5 is pushed up by the elastic restoring force to return to the original state of FIG. 2 as in the conventional example.
[0025]
And even if the operating body 5 tends to tilt due to the eccentricity of the position between the operating portion 5E and the pressing portion 5B of the operating body 5 during this operation, the tip inner side surface 5F of the substantially T-shaped regulating portion 5C of the operating body 5 The operation body 5 can be prevented from being inclined by hitting the outer side surface 6E of the parallel columnar portion 6B of the cover 6.
[0026]
In the above embodiment, the case where the shape of the restricting portion of the operating body is substantially T-shaped has been described, but it is needless to say that this may be a cross shape or a Y-shape.
[0027]
【The invention's effect】
As described above, according to the present invention, even if the operating body tries to tilt due to the eccentricity of the position of the operating portion that applies a pressing force to the operating body of the push switch and the pressing portion that presses the contact piece, a rotational moment is applied during operation. The control part of the operating body can be prevented from leaning against the columnar part of the guide part extended from the cover. As a result, a practical effect can be obtained that the suction nozzle of the automatic mounting machine does not cause a suction failure, or does not cause defects such as a touch failure during switch operation and variations in switch ON position accuracy.
[Brief description of the drawings]
1 is an exploded perspective view of a push switch according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the push switch. FIG. 3A is a top view of an operating body that is the main part. 4) (a) Top view of the main part of the cover (b) Front cross-sectional view (c) Side cross-sectional view [FIG. 5] Cross-sectional view taken along line XX in FIG. Fig. 7 is an exploded perspective view of a conventional push switch. Fig. 8 is a cross-sectional view of the conventional push switch. Fig. 9 is a cross-sectional view of a state in which the operating body is pressed. FIG. 11 is a cross-sectional view of the state in which the operating body is attracted by the nozzle. FIG. 11A is a cross-sectional view of the operating body tilted. FIG. 11B is a cross-sectional view of the operating body pushed in the state of FIG.
DESCRIPTION OF SYMBOLS 1 Case 2, 3 Fixed terminal 2A, 3A Fixed contact 4 Contact piece 4A Bending part 4B Support part 4C, 4D Movable contact part 4E Connection part 5 Operation body 5A Bar-shaped part 5B Pressing part 5C Restriction part 5D Narrow part 5E Operation part 5F Front end inner surface 6 Cover 6A Hole 6B Columnar portion 6C Support wall 6D Mounting frame 6E Outer side surface

Claims (1)

A pair of fixed contacts, each with a single terminal, are insert-molded so that the inner bottom surface is exposed, and a plastic box-shaped case with an opening on the top, and a bifurcated branch extending from one end that becomes the fulcrum. The bent portion is formed into a U shape with a pair of movable contacts elastically contacting the fixed contact at the other end, and a connecting portion serving as an operation point is provided by connecting a fork to the movable contact side of the bent portion. a contact piece made of a metal plate having elasticity, and the lower end side consisting set digit bar-shaped portion in the molded resin of the operating tool pressing portion for pressing the contact piece in contact with the connecting portion of the contact piece, the operation body with the rod-like portion is formed to contact with a support wall for supporting and positioning the fulcrum in a flat plate shape provided on the fulcrum portion of the hole you and the contact piece which projects to the outside of the mounting frame provided at both ends Connected to the upper surface of the case through Ri Do from resin cover, in the direction opposite to the pressing body at the lower end side of the rod-like portion of the operating body, the position regulation and the distal end Hosohaba portion has a substantially T-shape to protrude respectively side And a columnar portion that extends downward from the hole of the cover along the inner periphery thereof, and sandwiches the narrow portion of the operating body from both sides. push switch tip inner surface of the regulating portion Ru is restricted the operating body is tilted by striking the above-mentioned columnar section.

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