JPH0646036Y2 - Push button switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] (Industrial Field of Application) The present invention relates to a push button switch used, for example, as a forward / reverse switch of a motor.

(Prior Art) A push button switch of this type has a fixed base with a fixed contact portion, a contact base with a movable contact portion, a cover to which the contact base is attached and fixed to the fixed base, and an overall shape. It is C-shaped and has a wire spring that is connected to the contact base on the opening side and the opposite side is mounted in a recess provided in the inner wall of the cover. The movable contact provided on the base is contacted and separated by the spring force of a wire spring having an overall shape of C.

The C-shaped wire spring is connected to the contact base having the movable contact portion on the opening side and the fixed base having the fixed contact portion on the side opposite to the opening side so as to be inclined, and the C-shaped wire spring is connected. By using the spring return force of the spring, the movable contact part provided on the contact base is returned to the initial position (the position where the movable contact is separated from the fixed contact) when the pressing force applied to the wire spring disappears. .

That is, the fixed contact and the movable contact have a so-called normally open contact structure in which the movable contact and the fixed contact are in contact with each other while the wire spring is pressed by pressing the push button.

In the C-shaped wire spring, when the movable contact portion and the fixed contact portion are opened and closed, the movable contact portion moves up and down and acts as a spring for immediate insertion and disconnection at the dead point of the wire spring.

(Problems to be solved by the invention) In the push button switch formed as described above, the fixed contact provided on the fixed base and the movable contact provided on the contact base are brought into contact with and separated from each other by utilizing the movement of the C-shaped wire spring. The C-shaped wire spring is positioned with respect to the cover by abutting both sides of the C-shaped wire spring on a support wall provided on the cover. It is necessary to match the distance between the support walls and the width of the C-shaped wire spring. If there is a dimensional error between them, the C-shaped wire spring will come off the cover and the C-shaped wire spring can be positioned on the cover securely. In addition, since the mounting space for the C-shaped wire spring is limited, the assembly work becomes difficult.

The present invention has been made in view of the above points, and an object of the present invention is to provide a push button switch that ensures positioning of a C-shaped wire spring on a cover and prevents the C-shaped wire spring from coming off from the cover. To do.

[Constitution of device]

(Means for Solving the Problem) A push button switch according to the present invention comprises a fixed base having a fixed contact portion, a contact base having a movable contact portion, and a cover to which the contact base is attached and fixed to the fixed base. A push button switch having an overall shape of C and having an opening side connected to a contact base and a side opposite to the contact base mounted in a recess provided in the inner wall of the cover, the side opposite to the opening side of the wire spring. In addition to providing an engaging portion at the above-mentioned portion, the cover is provided with an engaging portion that engages with the engaging portion of the wire spring.

Another push button switch of the present invention is a fixed base having a fixed contact portion, a contact base having a movable contact portion, a cover to which the contact base is attached and fixed to the fixed base, and an overall shape is C-shaped. In a push button switch having an opening side connected to a contact base and a side opposite to the contact spring mounted in a recess provided in the inner wall of the cover, an engaging portion is provided at a portion opposite to the opening side of the wire spring. In addition to the above, the cover is provided with a locking portion that engages with the engaging portion of the wire spring, and the concave portion provided on the inner side wall of the cover and the end surface of the cover are connected by an inclined guide surface.

(Operation) In the push button switch of the present invention, the C-shaped wire spring is provided on the inner wall of the car by pushing down the contact base on which the C-shaped wire spring is mounted from the opening of the cover which is inverted and arranged. The wire spring is fitted into the concave portion, and at the same time, the engaging portion provided on the C-shaped wire spring is fitted with the locking portion provided on the cover, thereby ensuring the positioning of the wire spring and preventing the wire spring from coming off from the cover. .

Further, in another push button switch of the present invention, the C-shaped wire spring moves in the direction in which it narrows due to the inclined guide surface provided between the recessed portion provided on the inner wall portion and the opening end, and the C-shaped wire spring itself. The spring force of the contact base allows the contact base to be fitted into the recessed portion, which allows the contact base to be assembled into the cover automatically. The wire spring can be reliably positioned, and the wire spring does not come off from the cover. .

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

1 to 3, reference numeral 1 denotes a cover of a push button switch, and a contact base 3 having a movable contact portion 2 is attached to the cover 1 via a C-shaped wire spring 4. The cover 1 is fixed to a fixed base 5 having a fixed contact portion 5 by a usual means.

The cover 1 has a cross section V at a portion near the opening end of the inner wall portion.
A groove 7 of the shape is also formed adjacent to this groove 7 to form a locking part 8.

The C-shaped wire spring 4 is, as shown in FIG.
The opening side 4a is connected to the contact base 3, and the opening side 4a
A concave portion 9 is formed at a portion 4b opposed to, that is, a central position in the width direction. Recess 9 provided in C-shaped wire spring 4
Is set so that when the portion 4b is fitted in the groove 7 provided in the cover 1, the engaging portion 8 is engaged and the position thereof is held.

On the other hand, the push button 10 provided on the upper surface of the cover 1 is connected to the movable contact portion 2 of the contact base 3, and by pushing the push button 9, the movable contact 2a of the movable contact portion 2 is fixed to the fixed contact 5a of the fixed contact portion 5. I try to contact him.

Although the engaging portion is a concave portion in the above embodiment, it may be a convex portion, and the formation position thereof may be a position deviated from the central portion.

Then, in order to assemble the contact base 3 into the cover 1, the pair of C-shaped wire springs 4 is formed into a C-shape in which the pair of C-shaped wire springs 4 spread downward on the contact base 3 as shown in FIG. So that it fits. In this case, the spread width A of the C-shaped wire spring 4 is covered by the cover 1
The width is set to be narrower than the width B of the opening.

Next, the contact base 3 having the C-shaped wire spring 4 mounted thereon is positioned directly above the opening of the inverted cover 1, and the contact base 3 is lowered to move the C-shaped wire spring 4 to the position shown in FIG. As shown, the portion 4b of the C-shaped wire spring 4 is inserted into the opening of the cover 1 to a position below the groove 7 of the cover 1 as shown by the dotted line in FIG. The portion 4b of 4 is fitted into the groove 7 as shown by a solid line by using a tool not shown. At the same time, the recess 9 provided in the C-shaped wire spring 4 engages with the locking portion 8 provided in the cover 1 and holds its position. In this state, the contact base 3 is located above the opening of the cover 1.

Then, when the contact base 3 is pushed down into the opening of the cover 1, the C-shaped wire spring 4 shown in FIG.
Becomes horizontal, and as shown in FIG. 5d,
When the contact base 3 is pushed down into the opening of the cover 1, the C-shaped wire spring 4 is reversed, and the spring pressure of the C-shaped wire spring 4 causes the C-shaped wire spring 4 to be installed at a predetermined position of the cover 1.

FIG. 6 shows another embodiment of the present invention. In this embodiment, a guide surface 20 is formed which extends obliquely downward and extends from the opening end of the inner wall portion of the cover 1 to the groove 7. In this case, B> A between the spread width A of the C-shaped wire spring 4, the opening width B of the cover 1 and the opening end distance C of the groove 7.
It is set so that the relationship of> C is maintained. By setting in this way, as shown in FIG. 6a, the contact base 3 having the pair of C-shaped wire springs 4 mounted in a V shape is positioned directly above the opening of the inverted cover 1,
When the contact base 3 is lowered, the C-shaped wire spring 4 enters the opening of the cover 1 as shown in FIG. 6B, and the width of the C-shaped wire spring 4 narrows along the inclined guide surface 20. When the contact base 3 is further lowered by reaching the opening end of the groove 7 in the direction, the C-shaped wire spring 4 is not applied with any force by the spring pressure of its own, as shown in FIG. 6c. The recess 9 provided in the C-shaped wire spring 4 is fitted into the groove 7 and, at the same time, engages with the locking portion 8 provided in the cover 1 to hold its position. In this state, the contact base 3 is located above the opening of the cover 1.

Then, when the contact base 3 is pushed down into the opening of the cover 1, the C-shaped wire spring 4 shown in FIG.
Becomes horizontal, and further, as shown in FIG. 6e,
When the contact base 3 is pushed down into the opening of the cover 1, the C-shaped wire spring 4 is reversed, and the spring pressure of the C-shaped wire spring 4 causes the C-shaped wire spring 4 to be installed at a predetermined position of the cover 1.

[Effect of device]

As described above, according to the present invention, the overall shape is C-shaped, and the opening side is connected to the contact base and the opposite side is opposite to the opening side of the wire spring mounted in the recess provided in the inner wall of the cover. Since the engaging portion is provided at the side portion and the engaging portion that engages with the engaging portion of the wire spring is provided on the cover for mounting the contact base, the wire spring is reliably positioned and the wire spring is removed from the cover. It does not come off.

Further, by providing an inclined guide surface between the concave portion provided on the inner wall portion of the cover and the opening end, the C-shaped wire spring is fitted into this concave portion by its own spring force, so that the cover of the contact base is covered. Assembly work can be automated and assembly workability is improved.

[Brief description of drawings]

1 is a plan view of a push button switch according to the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a view showing a cover and a contact base portion, and FIG. 4 is a wire. FIG. 5 is a view showing a spring portion, FIG. 5 is a view showing a process of assembling the cover and the contact base of the push button switch according to the present invention,
FIG. 6 is a view showing another embodiment of the present invention. 1 ... Push button switch cover, 3 ... Contact base, 4
... C-shaped wire spring, 7 ... cover groove, 8 ... locking portion, 9 ... recess, 20 ... inclined guide surface.

Claims (2)

[Scope of utility model registration request] 1. A fixed base having a fixed contact portion, a contact base having a movable contact portion, a cover mounted with the contact base and fixed to the fixed base, and an overall shape of C-shaped contact on the opening side. In a push button switch having a wire spring that is connected to the base and the side opposite to this is mounted in a recess provided in the inner wall of the cover, while providing an engaging portion at a site opposite to the opening side of the wire spring, A push button switch, wherein the cover is provided with an engaging portion that engages with an engaging portion of the wire spring. 2. The push button switch according to claim 1, wherein a concave portion provided on the inner wall of the cover and an end surface of the cover are connected by an inclined guide surface.