JPH038049B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method of applying a fixed contact piece and a movable contact piece made of conductive elastic strips to each other, and by bringing the two contact pieces into contact with each other or separating them. This invention relates to a leaf switch that is electrically opened and closed by using a leaf switch.

[Prior Art] Conventionally, this type of leaf switch generally has a fixed contact piece and a movable contact piece facing each other, and the bases of these pieces are integrally molded with synthetic resin material. . In this molding process, the contact pieces, which are separated one by one, must be manually placed one by one in a predetermined position within the mold, making complete automation extremely difficult. Furthermore, in order to configure a plurality of pairs of contact piece circuits, it is extremely troublesome to manually arrange the number of contact pieces.

Furthermore, since both contact pieces are molded to face each other from the beginning, it is difficult to manufacture a normally closed switch, and there are also problems such as weak elastic pressure between both contact pieces. Furthermore, since it is difficult to confirm the condition of the contact surfaces of both contact pieces in advance, there is also the problem that quality control is difficult.

[Object of the Invention] In order to improve the problems of the conventional example as described above, the object of the present invention is to fix the fixed contact piece and the movable contact piece to a base in an expanded state without having them face each other in advance. The object of the present invention is to provide a leaf switch which is extremely easy to manufacture and has many advantages, by subsequently folding the molded part so that both contact pieces face each other.

[Summary of the invention] The gist of the present invention for achieving the above object is as follows:
The bases on which the fixed contact piece and the movable contact piece are respectively fixed are connected together by a thin hinge part,
This leaf switch is characterized in that the leaf switch is folded around the hinge portion, and the fixed contact piece and the movable contact piece are opposed to each other by a holding means that holds the folded state.

[Embodiments of the Invention] The present invention will be described in detail based on illustrated embodiments.

Figures 1 to 3 show an embodiment in which only one pair of fixed and movable contact pieces is provided, and Figure 1 shows its completed state;
FIG. 2 shows the molded state, and FIG. 3 shows the state in the middle. A fixed contact piece 1 and a movable contact piece 2, which are made of elastic strips made of conductive metal plates and have contacts 1a and 2a at their tips, are arranged horizontally as shown in FIG. Each of the bases 3 and 4 is molded from a resin material, and these two bases 3 and 4 are integrally connected by a thin hinge portion 5 located between them. Further, a lock pawl 6 is provided in the base 3 of the fixed contact piece 1, and a lock hole 7 is provided in the base 4 of the movable contact piece 2, respectively. Note that a driving piece 8 is attached to the tip of the movable contact piece 2 as required.

After molding into the unfolded state as shown in FIG. 2, the bases 3 and 4 are overlapped by bending around the hinge part 5 as shown in FIG. The folded state is locked by fitting together. In this state, as shown in FIG. 1, the fixed contact piece 1 and the movable contact piece 2 face each other, and by moving the movable contact piece 2 with the drive piece 8, the respective contacts 1a and 2a are brought into contact or opened. can be released.

In the previous embodiment, the fixed contact piece 1 and the movable contact piece 2 are a pair, but as shown in FIG. It is also possible to provide three pairs of contact circuits by embedding the contact pieces 2. No matter how many pairs of stationary contact piece 1 and movable contact piece 2 face each other in this way,
This means that molding can be performed while arranging them horizontally.

The contact pieces 1 and 2 are manufactured by punching and forming the contact pieces in a chain shape with a connecting piece, but in that state, molding is performed as shown in Fig. 2 or 4, and after molding. It is only necessary to separate the connecting pieces.Therefore, there is no need to manually align the contact pieces 1 and 2 one by one in this operation, and the process up to molding can be carried out completely automatically.

In the case of a normally open type switch, both the fixed contact piece 1 and the movable contact piece 2 may be kept in a straight state as shown in Fig. 5, but in the case of a normally closed type switch, the fixed contact piece 1 or the movable contact piece Connect the contact piece 2 to the 6th
As shown in the figure, by bending the switch by an angle θ before and after it is molded, a normally closed switch with a large contact pressure can be easily manufactured.

The locking mechanism that maintains the state in which the fixed contact piece 1 and the movable contact piece 2 face each other, that is, the state in which the bases 3 and 4 are stacked, includes the lock pawl 6 and the lock hole 7 of the embodiment.
Various other types can be used, or the base 3 can be attached by gluing without a locking mechanism.
and the base 4 can also be fixed.

Furthermore, the bases 3 and 4 may be provided with support pieces for preventing excessive deformation of the fixed contact piece 1 and the movable contact piece 2, other protrusions or tongue pieces for mounting, or necessary holes and recesses. Needless to say, it can be provided in In the embodiment, the contact pieces 1 and 2 are fixed to the bases 3 and 4 by insert molding, but it is also possible to make cuts in the bases 3 and 4 connected by the hinge part 5 in advance. , the contact pieces 1 and 2 may be inserted into these notches.

[Effects of the Invention] As explained above, in the leaf switch according to the present invention, the base is molded with the fixed contact piece and the movable contact piece arranged horizontally without facing each other, and the base is folded after molding. Since the fixed contact piece and the movable contact piece are overlapped and configured to face each other, molding work can be performed without requiring manual labor, and costs can be significantly reduced. Furthermore, since the contact piece can be bent in the required direction in advance, it is easy to manufacture a normally closed switch. Furthermore, since the condition of the contact surface can be confirmed in advance, it is advantageous for quality control.

[Brief explanation of the drawing]

The drawings show an embodiment of the leaf switch according to the present invention. FIG. 1 is a perspective view of the completed state, FIG. 2 is a perspective view of the leaf switch after molding, and FIG. 3 is a perspective view of the leaf switch in the middle of folding. FIG. 4 is a perspective view of another embodiment after molding, FIG. 5 is a side view of the contact piece of the normally open type switch, and FIG. 6 is a side view of the contact piece of the normally closed type switch. be. Reference numeral 1 designates a fixed contact piece, 2 a movable contact piece, 3 and 4 a base, 5 a hinge portion, 6 a lock pawl, and 7 a lock hole.

Claims (1)

[Scope of Claims] 1. A base on which a fixed contact piece and a movable contact piece are respectively fixed are connected together by a thin hinge part, folded around the hinge part, and maintained in this folded state. A leaf switch characterized in that the fixed contact piece and the movable contact piece are opposed to each other by a holding means. 2. The leaf switch according to claim 1, wherein the fixed contact piece and the movable contact piece are provided in one or more pairs using a common base. 3. The leaf switch according to claim 1, wherein the holding means is a locking means provided on the base. 4. The leaf switch according to claim 1, wherein the holding means is a means for adhering the bases together.