JPS6317144Y2 - - Google Patents

Description

[Detailed Description of the Invention] Conventionally, the contacts of small load switches generally use precious metals in order to obtain stability during contact. However, since precious metals are extremely expensive,
The contact is formed into a trapezoidal shape as shown in FIG. 4, and precious metal is used only for the head 31, thereby minimizing the amount of precious metal used. Furthermore, the contact pressure is increased by reducing the area of the contact portion. However, in the conventional type, since the contact portion is a rigid body, there is a problem in the contact reliability.

This invention is an attempt to eliminate such conventional drawbacks, and one embodiment of this invention will be described below with reference to the drawings.

That is, in FIG. 5, fixed contact assemblies 2, 2 are fitted into the side wall of the housing 1, fixed contacts 3, 3 are located inside the housing, and terminals 4 are located outside the housing 1. , 4 are drawn out. Also, the housing 1 has an anchor 5.
is fixed, and the other end of this anchor is attached to the housing 1
It is pulled out to form a terminal 6. One end of a lever 7 is engaged with this anchor, and the other end of this lever abuts a plunger 8 guided on the upper wall of the housing. One end of a tension member 10 of a movable spring 9 engages with the lever 7, and one end of its compression member 11 abuts against the anchor 5. A movable contact 12 is fixed to the free end of the movable spring 9, and the movable contact 12 is brought into selective contact with the fixed contacts 3 by the reversing action of the movable spring 9.

Then, as shown in FIG. 7, the substrates 20, 20 constituting the fixed contact assembly 2 are bent in a direction in which the free ends extending to the housing 1 are separated from each other, so that the inclined portion 21 is bent. It is formed. Cutouts 22 that fit into the side walls of the housing 1 are provided on both sides of the substrate 20 . One end of a contact 3 formed of an elastic plate is attached to the flat part 23 of the substrate 20 with a stud 2.
5 and 25, and the other end of this contactor extends toward the free end side of the substrate 20, thereby forming a space 26 between the free end of the contactor 3 and the inclined portion 21. (Figure 5). A plurality of comb-shaped contact portions 28, 28 are formed in the contactor 3 by cuts 27 provided from its free end.

As shown in FIG. 6, the movable contact 12 is formed by bending a plate-shaped body, is attached to the tip of the movable spring 9 so as to sandwich it, and is welded to the movable spring 9 at this portion. . Both ends of the movable contact 12 are bent outward, and the fixed contacts 3, 3, that is, the contact portions 28, 28 are attached to the edges.
Movable contact portions 30, 30 are formed which intersect diagonally with respect to the arrangement plane, and whose edges extend in a direction intersecting the axial direction of the fixed contacts 3, 3, and these portions are plated with noble metal, for example. will be applied.

Further, as shown in FIG. 8, both side edges of the contact portions 28, 28 are bent downward, thereby forming a convex portion 29 at a portion C that contacts the movable contact 12.

In this invention, as described above, the part of the board 20 accommodated in the housing 1 is connected to the pair of boards 20, 20.
The inclined portions 21 are formed by bending them in the directions in which they are spaced apart from each other, while the contact 3 made of an elastic body is fixed to the substrate 20, and a plurality of contact portions 28, 28 are formed on the contact. Therefore, when contacting the movable contact 12, the contact portions 28, 28 of the fixed contact 3 are bent independently, thereby ensuring reliable contact.

In addition, the movable contactor 12 is provided with a contact portion 30 that intersects obliquely with the arrangement plane of the contact portion 28 and whose edge extends in a direction intersecting with the axial direction of the fixed contactors 3, 3. This has the advantage of increasing contact reliability and reducing the number of areas that require expensive precious metals, thereby enabling cost reduction.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of a conventional small snap-action switch for small loads. Figure 1 is a front view with the cover removed, and Figure 2 is a movable spring assembly. 3 is a perspective view of the assembly of the fixed contact, FIG. 4 is an enlarged perspective view showing the contact state of the fixed contact and the movable contact, and FIGS. 5 to 8 are the nuts in this invention. 5 is a front view thereof, FIG. 6 is a perspective view of a movable spring assembly, and FIG. 7 is a perspective view of a fixed contact assembly.
FIG. 8 is a perspective view showing the state of contact between the fixed contact and the movable contact. Note that the same reference numerals in the figures indicate the same or corresponding parts. DESCRIPTION OF SYMBOLS 1... Housing, 2... Fixed contact assembly, 3... Fixed contact, 4, 4... Terminal, 5...
Anchor, 6... Terminal, 7... Lever, 8... Plunger, 9... Movable spring, 10... Tension member, 11... Compression member, 12... Movable contact, 2
0... Substrate, 21... Inclined part, 22... Notch part, 23... Plane part, 26... Space, 27... Notch, 28... Contact part, 29... Convex part, 30...
Movable contact part.

Claims (1)

[Scope of utility model registration request] A snap-action mechanism having a fixed contact base plate 20 and a movable spring 9 in contact with the fixed contact base plate is provided in the housing 1, and the free end of the fixed contact base plate 20 is located on the axis extending into the housing 1. are bent in a direction away from the axis thereof to form inclined portions 21, and one end of the fixed contact 3 formed of an elastic plate-like body is fixed to each of the fixed contact substrates 20, the other end is provided on the free end side of the fixed contact board and extends along its axis;
Moreover, a plurality of fixed contact portions 28 that bend independently are provided along the axis of the free end side of the fixed contact 3, and the movable spring 9 is attached to the fixed contact portion.
A curved convex portion 29 that protrudes to the side is provided, and a movable contact 12 that contacts the fixed contact 3 is provided at the free end of the movable spring 9, and this movable contact bends the plate-shaped body. One end thereof is fixed to the free end of the movable spring 9, the other end is diagonally intersected with the arrangement surface of the fixed contact portion 28, and the edge thereof is A snap action is arranged so as to extend in a direction intersecting the longitudinal direction of the fixed contact section 28, so as to come into contact with the edge of the movable contact 12 and the curved convex section 29 of the fixed contact section 28. Switch.