JPH0441544Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a new switch that has the characteristics of both a slow-type switch and a snap-action type switch.

<<Prior Art>> Switches used in control equipment can be broadly classified into slow type and snap action type.

《Problems that the invention aims to solve》 Slow type switches have excellent resistance to welding of the contacts because the operating force and return force of the pushbutton become the contact switching force, but on the other hand, the contact switching speed is slow, so the There is severe wear and tear on OP (operating position) and RP.
(Return position) There is almost no difference between the position and the position, which makes it difficult to use. On the other hand, a snap-action type switch has exactly the opposite characteristics to a slow-type switch. In other words, although it does not have sufficient welding resistance, it has the advantage of being easy to use because the contact switching speed is fast and there is a difference between OP and RP.

Therefore, the purpose of this invention is to provide a new switch that has the advantages of both the slow type and snap action type, has a simple structure, and has a small number of parts.

<Means for Solving the Problems> The switch according to this invention is a switch in which a movable contact is moved to perform switching with respect to a fixed contact by pressing an operating plunger against the spring force of a return spring. An expandable movable spring is interposed between the operation plunger and the movable contact, and a holding portion is provided between the movable contact and the fixed contact to temporarily maintain the engaged state of the movable contact with the fixed contact. The movable spring is compressed by the pressing action of the operating plunger, and the movable contact, which is temporarily held in the engaged state with the fixed contact, is rapidly moved by the spring force accumulated in the movable spring, and the contact is closed. Equipped with a contact switching mechanism for switching.

<<Example>> An example of a switch according to this invention is shown in FIGS. 1, 2, and 3. Bottomed case 1 made of synthetic resin and integrally molded into a rectangular shape
Inside, a pair of fixed terminals 2 and 3 are fixed in grooves 1a and 1b at both ends with their lower portions protruding outside the case 1. The fixed terminals 2 and 3 are folded downward inward at their upper portions to give them spring properties, and their lower ends are bent inward in a dogleg shape to form fixed contacts 4 and 5. There is.

A flange portion 6a of an operating plunger 6 is attached to the center of the case 1 so as to be slidable in the vertical direction, guided by two sets of guides 1c and 1d projecting inward from both side walls. The operation plunger 6 includes an upper cylindrical operation section 6b,
A rectangular flange portion 6a at the middle portion and a smaller rectangular contact holding portion 6c at the lower portion are integrally molded. Compression coil springs 7 and 8, which are return springs, are interposed between the lower ends of the flange portion 6a and the guide holes 1e and 1f in the inner bottom of the case 1. The upper operation part 6d of the operation plunger 6 is
A boss portion 9 protrudingly formed on the back surface of the case cover 9
The case cover 9 is slidably inserted into a guide hole 9b penetrating through the case cover 9, and the case cover 9 is fitted with locking holes 9c and 9d formed in both arms thereof into locking protrusions 1g and 1h formed on the outer wall of the case. It can be attached to the case 1 by matching it.

The lower contact holding portion 6c of the operation plunger 6 is
It has a window 6d penetrating both sides thereof, and a U-shaped movable contact 10 is attached to the window 6d.
a, 10b are locked so that they can be moved upwards. A boss 10c is provided on the top surface of the movable contact 10.
is formed by burring, and the surrounding area and the window portion 6d
A compression coil spring 12, which is an expandable movable spring, is interposed between the spring support 11 inserted toward the center hole of the flange portion 6a. In this state, the movable contact 10 is in contact with the lower end of the window 6d, and the spring receiving part 11 is in contact with the upper end of the window 6d.
Grooves 10d and 10e are formed on the outside of both arm portions 10a and 10b of the movable contact 10, with which the dogleg portions of the fixed contacts 4 and 5 engage, respectively. It is clamped and temporarily held by the elastic force of. These grooves 10d, 10
e may be a protrusion.

Next, the operation of this switch will be explained.
In the free state, as described above, the operating plunger 6 is pressed upward by the return springs 7 and 8, and the movable contact 10 is temporarily held between the fixed contacts 4 and 5. It is spaced apart from the spring receiver 11 by the movable spring 12. Next, when the operation plunger 6 is pressed downward, the return springs 7 and 8 are bent and the operation plunger 6 moves downward as a whole, but the movable contact 10 is temporarily held by the fixed contacts 4 and 5. Therefore, do not move. Therefore, the movable spring 1 between the spring receiver 11
2 is gradually compressed and when the lower end of the spring receiver 11 hits the movable contact 10, the movable contact 10 is directly pushed by the pressing force of the operating plunger 6. Since this pressing force is stronger than the force with which the fixed contacts 4 and 5 temporarily hold the movable contact 10, the movable contact 10 is detached from the fixed contacts 4 and 5 due to this pressing force. At that moment, the movable contact 10 suddenly moves downward due to the spring force accumulated in the movable spring 12 and separates from the fixed contacts 4 and 5, causing the window 6d of the operating plunger 6 to move downward.
pressed against the bottom edge. Thereafter, when the pressure on the operating plunger 6 is released, the operating plunger 6 moves upward due to the spring force of the return springs 7 and 8, and the movable contact 10 also moves upward.
It is held at a predetermined position by fixed contacts 4 and 5.

In the above embodiment, the movable contact 10 temporarily held by the fixed contacts 4, 5 is detached from the fixed contacts 4, 5 directly by the pressing force of the operation plunger 6, The engagement of the contact 10 with the fixed contacts 4 and 5 is achieved by the return springs 7 and 5.
Since this is performed using a spring force of 8, large peeling force and wiping force can be obtained, and the welding resistance is high. In addition, the movable spring 1 is activated by pressing the operation plunger 6.
Since the movable contact 10 is rapidly separated from the fixed contacts 4 and 5 by the spring force accumulated in the contact point 2, the flow of arc current is reduced, and the wear and tear of the contacts is reduced.
Furthermore, since the contact is switched at the position after the movable spring 10 is deflected by the pressure of the operation plunger 6 (OP), the stroke amount is greater than the return contact position (RP), making it easier to use.

In the above embodiment, direct separation of the movable contact 10 from the fixed contacts 4 and 5 is performed by the spring receiver 1.
1 is brought into contact with the movable contact 10, but this can also be done by the movable spring 12 being fully compressed. In addition, the above embodiment is
The case where this invention is configured as a normally closed switch is explained, but in the case of a normally open switch,
The movable contact 10 is temporarily held by another member, and the spring force of the movable spring 12 accumulated by the pressing operation of the operating plunger 6 causes the movable contact 10 to rapidly move downward and come into contact with the fixed contact below. Just do it like this. Those skilled in the art will easily understand that this invention can be modified in various other ways using known techniques.

《Effects of the invention》 As mentioned above, the switch according to this invention can improve the welding resistance, which is an advantage of the slow type, and has a fast contact switching speed, which is the advantage of the snap-action type, It has advantages such as less consumption and ease of use as there is a difference between OP and RP.

Further, the switch according to this invention has a holding part that temporarily holds the engaged state of the movable contact with the fixed contact, and this holding part is configured using the spring force of the fixed contact with respect to the movable contact. Even if the shape is changed, for example, either the fixed contact or the movable contact has a protrusion (in the above embodiment, the "dog" part of the fixed contact) and a groove (same as the grooves 10d and 10e of the movable contact). ), and
It has a very simple configuration and does not require an increase in the number of parts.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a switch showing an embodiment of this invention, Fig. 2 is a transverse sectional view of the switch shown in Fig. 1, and Fig. 3 is a partial sectional view taken along the - line in Fig. 1. FIG. 1... Case, 2, 3... Fixed terminal, 4, 5...
...Fixed contact, 6...Operation plunger, 7, 8...
...Return spring, 9...Case cover, 10...Movable contact, 10d, 10e...Groove, 11...Spring receiver, 12...Movable spring.

Claims (1)

[Scope of utility model registration request] A switch that moves a movable contact to switch to a fixed contact by pressing an operating plunger against the spring force of a return spring, the switch having an expandable movable spring between the operating plunger and the movable contact. A holding portion is formed on the movable contact and the fixed contact to interpose and temporarily hold the engaged state of the movable contact with the fixed contact, and the movable spring is compressed by the pressing operation of the operating plunger. A switch equipped with a contact switching mechanism that switches the contact by rapidly moving the movable contact temporarily held in an engaged state with the fixed contact by the spring force accumulated in the movable spring.