JPH076576Y2 - Push switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a push switch used in various electronic devices.

2. Description of the Related Art FIG. 6 shows the structure of a conventional push switch, in which 1 is a box-shaped case, and a common terminal 2 and an individual terminal 3 are planted in a planar shape on the bottom surface. Reference numeral 4 is a push lever, 5 is a cover for sealing the sliding guide of the push lever 4 and the case 1, and 6 is a movable contact piece made of a conical coil spring. Edge 6a
The common terminal 2 and the large-diameter end 6b at the other end are pressed and sandwiched between the common terminal 2 and the bottom surface 4a of the push lever 4. FIG. 7 is a diagram showing a planar state of the common terminal 2 and the individual terminal 3. The individual terminal 3 is arranged so as to surround the common terminal 2 and concentrically with the movable contact piece 6. There is.

Next, the operation of the above conventional example will be described. 6 and 8
FIG. 10 and FIG. 10 are diagrams showing a series of operations, and FIG. 6 shows a release state of the push lever 4, and in this state, the individual terminal 3 and the movable contact piece 6 are not electrically connected. .
When the push lever 4 is pushed down from this state, as shown in FIG. 8, the individual terminal 3 and the contact portion 6a of the movable contact piece 6 are
Come into contact with. FIG. 9 shows the contact position between the movable contact piece 6 and the individual terminal 3 at that time. Further, FIG. 10 shows a state in which the push lever 4 continues to be pushed down and the push lever 4 reaches the bottom dead center, and FIG. 11 shows a contact position between the movable contact piece 6 and the individual terminal 3 at that time. .

However, in the conventional push switch described above, the seventh problem
As shown in FIG. 9, FIG. 11 and FIG. 11, although the contact portion (linear) increases depending on the push state of the push lever 4, the contact portion hardly slides (hereinafter, wiping), and therefore the unit Since the contact pressure per contact line is small, the contact reliability is poor, and the contact part is generally plated with expensive gold or the like. Therefore, there is a problem that the manufacturing cost is high. In addition, since the movable contact piece 6 is generally a conical coil spring that is difficult to be machined to a high degree, the positional accuracy of the first contact portion when the push lever 4 is pressed varies. There was a problem that the ON position of the switch could not be made highly accurate.

The present invention solves such a conventional problem, and an object thereof is to provide a push switch which is excellent in contact reliability and ON position accuracy and is inexpensive.

Means for Solving the Problems In order to achieve the above object, the present invention has a pair of contact surfaces planted on the same plane as the bottom surface of a substantially box-shaped case, and one of the contact surfaces has a semi-cylindrical protrusion contact. A fixed terminal whose portion is formed to be convex from the bottom surface of the case, a push lever for push operation, a slide guide for the push lever and a cover for sealing the case, and a coil spring shape made of a conductive material. Of the movable contact piece, a substantially central portion of one end contact end of the movable contact piece abuts on a semi-cylindrical contact portion of the fixed terminal, and the other end of the movable end has a part of the lower end of the push lever and the other portion. The movable end is pressed and sandwiched so as to be inclined with respect to the bottom surface of the case by the lower end of the protrusion formed on the lower end of the cover.

Therefore, according to the configuration of the present invention, the ON position can be controlled depending on the inclination angle of the movable end, and a highly accurate ON position can be secured without depending on the machining accuracy of the coil spring, and A wiping effect is generated in the contact portion by pushing the push lever after the contact is turned on. Therefore, even with relatively inexpensive silver plating, the contact reliability is sufficiently excellent and an inexpensive push switch can be obtained.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention.
Reference numeral 1 denotes a substantially box-shaped case, on the bottom surface 1a of which a common terminal 2 and an individual terminal 3 made of a thin plate conductive material are planted on the same plane as the bottom surface 1a, and the insert portion 2a of the common terminal 2 is U-shaped. It has a contact point portion 2b which is bent into a shape and is further processed at the end portion 2c into a kamaboko shape. 4 is a push lever and is a lever portion 4a
On the lower side, there is a truncated cone-shaped projection 4a for supporting a movable contact piece 6 described later. Reference numeral 5 is a cover for sealing the case 1 and for guiding sliding of the push lever 4, and a guide bush 5a for smoothly sliding the lever portion 4a of the push lever 4 and a projection 5a on the lower surface. And are formed. 6 is a cylindrical coil spring-shaped movable contact piece made of a conductive material, and the position of the fixed terminal 2 is slightly closer to the common terminal 2 than the center of the contact end 6a at one end (10 to 20% of the coil outline). 2b and a part 6c of the movable end 6b at the other end
, The protrusion 4b of the push lever 4 and the other portion 6d are pressed and sandwiched by the protrusion 5a of the cover 5, and in this state, the movable end 6a of the movable contact piece 6 contacts the protrusion 5a of the cover 5. It is in a state in which it is inclined downward (toward the bottom surface 1a of the case).

Next, the operation of the above embodiment will be described. 2, FIG. 3, FIG. 4, and FIG. 5 are diagrams showing a series of operations,
FIG. 2 shows the release state of the push lever 4. In this state, since the movable end 6b of the movable contact piece 6 is pressed downward by the protrusion 5b of the cover 5, a positive moment is generated in the movable contact piece 6 due to the reaction force P1, and therefore the contact end 6a. A sliding force FL is generated at the contact point 6b, and the contact end 6b contacts the stopper portion 1b provided on the bottom surface 1a of the case, so that the movable contact piece 6 maintains balance. Therefore, in this state, the contact end 6a of the movable contact piece 6 and the individual terminal 3 are not in a conductive state. When the push lever 4 is pushed down from this state and the movable end 6b of the movable contact piece 6 becomes substantially horizontal as shown in FIG. 3, the center of the contact end 6a of the movable contact piece 6 and the contact point of the common terminal 2 are contacted. Since the center with respect to the portion 2b is displaced in advance, the movable end 6a rotates clockwise around the contact portion 2b as the swing center, and the balance of the movable contact piece 6 is maintained again. Therefore, in this state, the movable end 6a and the individual terminal 3 are already in a conductive state, and the common terminal 2 and the individual terminal 3 are electrically connected via the contact end 6a.

Further, when the pushing operation of the push lever 4 is continued and the state shown in FIG. 4 is reached, the compression reaction force P2 of the movable contact piece 6 causes the contact end 6a.
The sliding force FR is generated due to the inclination, and wiping occurs at the contact portions of the contact end 6a, the contact portion 2b, and the individual terminal 3 due to the sliding force FR. After that, the wiping of the contact portion progresses to the bottom dead center state (full stroke state) of FIG. 5 in accordance with the pressing operation of the push lever 4.

Also, in the contact ON state of FIGS. 3, 4 and 5, the contact portion is at two positions, the contact end 6a of the movable piece 6 and the contact portion 2b of the common terminal 2, and the contact end 6a and the individual terminal. There is a total of 3 places.

As described above, according to the above-described embodiment, since the ON position can be controlled by the inclination angle of the movable end 6b, the ON position with high accuracy can be obtained.
The position can be secured, and the wiping effect of the contact portion has an advantage that the contact portion can be made excellent in contact reliability and inexpensive without applying expensive precious metal plating to the contact portion.

Effects of the Invention As described above, the present invention has the following effects.

(1) Since the ON position can be controlled by adjusting the tilt angle of the movable end, a highly accurate ON position can be secured.

(2) Since the wiping effect is generated in the contact portion and the contact pressure is high because there are only three contact portions, the contact reliability is excellent without the need for expensive precious metal plating.

(3) According to (2), the contact part may be plated with silver, which is relatively inexpensive, and the movable contact piece is a cylindrical coil spring having a simple shape that does not require high processing accuracy.
The manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a push switch according to an embodiment of the present invention, FIGS. 2 to 5 are sectional views showing the operation of the embodiment, and FIGS. 6, 8, and 10 are conventional sectional views. Sectional views showing the operation of the push switch, FIGS. 7, 9, and 11 are plan views showing changes in the contact position of the switch. 1 ... Case, 2 ... Common terminal, 3 ... Individual terminal, 4
...... Push lever, 5 ...... Cover, 6 ...... Movable contact piece.

Claims (1)

[Scope of utility model registration request] 1. A pair of contact surfaces are planted on the same plane as the bottom surface of a substantially box-shaped case, and one of the contact surfaces has a kamaboko-shaped protruding contact portion that is convex from the bottom surface of the case. Fixed terminal that is the terminal side and the other contact surface is the individual terminal side,
A push lever for performing a push operation, a slide guide for the push lever and a cover for sealing the case, and a coil spring-shaped movable contact piece made of a conductive material are provided, and one end of the movable contact piece is provided. At the position closer to the common terminal side from the center of the contact end, it comes into contact with the hook-and-loop contact part of the fixed terminal, and the other end of the movable end is partially formed at the lower end of the push lever and the other part at the lower end of the cover. A push switch in which the movable end is pressed and sandwiched so as to be inclined with respect to the bottom surface of the case with the lower end of the protrusion.