JP2972799B2 - Micro switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microswitch.

[0002]

2. Description of the Related Art Conventionally, microswitches shown in FIGS. 4 and 5 are known. The microswitch shown in FIG. 4 has a metal fixed terminal piece 2, a normally open fixed terminal piece 3, a normally closed fixed terminal piece 4, and a base end 5a which are disposed in a switch case 1. The contact 5b, which is locked in a locking groove 2b provided in one end 2a of the common fixed terminal piece 2 and provided at the tip, is connected to the tip 3 of each of the fixed terminal pieces 3, 4.
a, a movable contact piece 5 made of metal, which is disposed so as to be able to contact and separate from the movable contact piece a, 4a;
The movable contact piece 5 is provided with a metal compression spring 7 for giving a snap action. The compression spring 7 has one end 7a provided at the branch end 2c of the common fixed terminal piece 2. The other end 7b is locked to the movable contact piece 5 at the locking groove 2d. In the above configuration,
When the movable contact piece 5 is pushed down by a certain amount against the compression spring 7 by the pushing operation of the operating body 6, the contact 5b of the movable contact piece 5 is normally opened by the snap action of the compression spring 7. When the contact is switched to the tip 3a side of the terminal piece 3 and the pushing force of the operating body 6 is released, the tip 5b of the movable contact piece 5 becomes the tip 4a of the normally closed fixed terminal piece 4. Side is switched to the contact state.

[0005] The microswitch shown in FIG.
The base end 5a of the movable contact piece 5 is connected to the common fixed terminal piece 2
And a compression spring 7 for applying a snap action to the lower side of the movable contact piece 5. One end 7a of the compression spring 7 is locked by a locking groove 2d provided at the tip of the receiving metal 2e, and the other end 7b is in contact with the lower end of the movable contact piece 5 at the tip. . Then, in the same manner as described above, the micro switch is operated by pushing the movable contact piece 5 with the operating body 6, so that the contact 5b of the movable contact piece 5 is actuated by the snap action of the compression spring 7. And the tip 3a of the normally-open fixed terminal strip 3 and the tip 4a of the normally-closed fixed terminal strip 4 are selectively switched.

[0004]

In the microswitch shown in FIG. 4, the base 5 of the movable contact piece 5 is provided.
a is locked in a locking groove 2 b provided in one end 2 a of the common fixed terminal piece 2, and the one end 7
a is locked in the locking groove 2d provided in the branch end 2c of the common fixed terminal piece 2, the other end 7b of the compression spring 7 is locked in the movable contact piece 5, and the locking portion of each part is locked. Since the movement of the compression spring 7 and the movable contact piece 5 can be increased by increasing the number of strokes, the operability can be improved by increasing the stroke of the movable contact piece 5, and the stress applied to the movable contact piece 5 is also small and long. Although it has the advantage of being able to extend the service life, since there are many locking parts in each part, corrosion and wear occur in each locking part with long-term use, and these locking parts become one-sided and become The operation accuracy of the compression spring 7 and the movable contact piece 5 is deteriorated.
There was a problem that the contact reliability for No. 4 decreased. this child
Is disclosed in Japanese Utility Model Laid-Open No. 58-43730.
To the contact 5b side at the base end 5a of the movable contact piece 5
Cut and raised an elastic piece (not shown)
Then, this elastic piece is inserted into the locking groove 2d of the common fixed terminal piece 2.
Even when locked, the base end of the movable contact piece 5
5a side is locked in the locking groove 2d of the common fixed terminal piece 2.
As far as possible, the microswitch shown in FIG.
Similarly, each of the fixed terminal pieces 3 and 4 of the movable contact piece 5
There is a problem that the contact reliability with respect to is reduced.

On the other hand, in the microswitch shown in FIG. 5, since the number of locking portions of each part which causes corrosion and wear is smaller than that of the microswitch shown in FIG. Accuracy can be maintained satisfactorily, and the contact reliability of the movable contact piece 5 with each of the fixed terminal pieces 3 and 4 can be increased. However, the base end portion 5a of the movable contact piece 5 has the common fixed terminal 5a. because it is caulked into pieces 2 side, not only does not take long stroke of the movable contact piece 5, problem of easily damaged by stress concentration on the base end portion 5a side of the movable contact piece 5 is Atsuta . This means that
JP-A-62-10639 and JP-A-2-1388.
No. 22 discloses a contact opening / closing mechanism (not shown).
There is almost the same problem. The present invention has been made in order to solve the above-mentioned problems, and it is possible to maintain the operation accuracy of the movable contact piece satisfactorily over a long period of time and improve the contact reliability of the movable contact piece with the fixed terminal piece, Moreover, it is an object of the present invention to provide a microswitch capable of increasing the operability by increasing the stroke of the movable contact piece while reducing the overall configuration.

[0006]

Means for Solving the Problems] collision microswitch is according to the present invention, toward the distal end side to the base end side of the movable contact piece
Fixing the issued elastic piece on one side the common fixed terminal Then DOO
Fixing the elastic piece on one side of the common fixed terminal
The portion is formed wider than the elastic piece .

[0007]

[Action] In the microswitch above configuration, the movable contact piece of the proximal end to the distal end side elastic piece protruding towards is fixed to one side the common fixed terminal, i.e. the movable contact piece, the length The direction intermediate portion is fixed to one side of the common fixed terminal via the elastic piece, and the movable contact piece is movable around the fixed portion between the common fixed terminal piece and the elastic piece. The operability is enhanced by taking a long stroke of the movable contact piece, and the stress concentration on the fixed portion side of the movable contact piece can be reduced, so that damage is not caused, and there is no locking portion of the movable contact piece. from the operation accuracy of the movable contact piece is connexion better retained cotton long term, you improved contact reliability with respect to the fixed terminal piece of the movable contact piece. In particular, according to the above configuration, the common fixed terminal strip
The fixed part of the elastic piece on the side is wider than the above elastic piece
As a result, the elastic piece has stability on one side of the common fixed terminal.
Fixed, eliminating the one-sided contact opening / closing operation
Check the contact reliability of the movable contact piece to each of the above fixed terminal pieces.
The layer can be improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a microswitch according to the present invention, and its basic structure is the same as that of the conventional FIG.
Since it is the same as that of FIG. 5, detailed description will be omitted, and the same components will be described with the same reference numerals. FIG.
4 and FIG. 5 differs from the conventional one shown in FIGS. 4 and 5 in the structure for fixing the movable contact piece 5 to the common fixed terminal piece 2.

That is, as shown in FIG. 2, the movable contact piece 5 has a first opening 5 at the base end 5a side in the longitudinal direction.
c, and an elastic piece 5 extending toward the contact 5b provided at the tip of the movable contact piece 5 inside the first opening 5c.
d is integrally formed, and the tip of this elastic piece 5d is
A caulking hole 5e is formed at the end. In addition, a second opening 5f is opened at the tip end of the movable contact piece 5, and one end 7a of the compression spring 7 is inserted downward from the second opening 5f, and the one end 7a is connected to the above-mentioned end. The common fixed terminal piece 2 is locked in the locking groove 2d provided in the branch end 2c, and the other end 7b of the compression spring 7 is locked in the tip end of the second opening 5f. The snap contact is applied to the movable contact piece 5.

Further, on the upper end side of the common fixed terminal piece 2,
A support piece 2g extending toward the branch end 2c is integrally formed so as to protrude, and a crimping projection 2h is formed on the upper end of the support piece 2g. The caulking hole 5e provided in the elastic piece 5d of the movable contact piece 5 is
The movable contact piece 5 is elastically fixed to the common fixed terminal piece 2 via the elastic piece 5d by being inserted and fitted into the crimping projection 2h of g. As described above, the middle portion in the length direction of the movable contact piece 5 is caulked to the support piece 2g side of the common fixed terminal piece 2 via the elastic piece 5d,
The caulking stopper between the support piece 2g and the elastic piece 5d , that is,
Since the movable contact piece 5 is configured to be movable by the pushing operation of the operating body 6 about the fixed portion 2i , the stroke of the movable contact piece 5 can be increased while the overall configuration is reduced, and the operability is improved. In addition, since the stress concentration on the crimp-stopping portion of the movable contact piece 5 can be reduced and no breakage occurs, and since there is no locking portion of the movable contact piece 5, the operation of the movable contact piece 5 Accuracy is maintained satisfactorily for a long time, and the contact reliability of the movable contact piece 5 with each of the fixed terminal pieces 3 and 4 is improved. In particular,
For example, the fixing portion 2i of the elastic piece 5d in the common fixed terminal piece 2
Is formed wider than the elastic piece 5d.
The piece 5d is fixed to the common fixed terminal piece 2 with good stability.
Eliminates one-sided contact in the opening / closing operation of 5b
Contact reliability of the contact piece 5 with each of the fixed terminal pieces 3 and 4
Can be further improved.

Further, in the present invention, as shown in FIG. 3, the movable contact piece 5 side is configured in the same manner as the above case,
It is also possible to change the mounting structure of the compression spring 7.
That is, a compression spring 7 for applying a snap action is disposed below the movable contact piece 5, and one end 7 a of the compression spring 7 extends from the common fixed terminal piece 2 to a support 2 i.
And the other end 7b of the compression spring 7 is brought into contact with the lower end portion of the movable contact piece 5 at the same time.

In the embodiment of FIG. 2, the elastic piece 5d is formed integrally with the first opening 5c of the movable contact piece 5, but this elastic piece 5d is formed separately from the movable contact piece 5. Then, it is also possible to combine these members together later. Further, in the embodiment of FIG. 1, two fixed terminal pieces 3 and 4 to which the contact 5b of the movable contact piece 5 is selectively contacted are provided, but in the present invention, only one fixed terminal is provided. It is also possible to apply to.

[0013]

As described in the foregoing, according to the microswitch of the present invention, it is made to protrude from the elastic piece toward <br/> distally to the proximal end side of the movable contact piece, common elastic piece Since the movable contact piece is fixed to one side, the operational accuracy of the movable contact piece can be favorably maintained for a long period of time, and the contact reliability of the movable contact piece with the fixed terminal piece can be improved. However, the operability can be enhanced by increasing the stroke of the movable contact piece. Special
According to the above configuration, the elastic piece in the common fixed terminal piece
Since the fixing portion of the elastic piece is formed wider than the elastic piece,
The elastic piece is fixed to the common fixed terminal piece with good stability.
The movable contact piece eliminates one-sided contact in opening and closing operation.
To further improve the contact reliability of each fixed terminal piece.
Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a microswitch according to the present invention.

FIG. 2 is an exploded perspective view of the main part.

FIG. 3 is a partially omitted cross-sectional view showing another embodiment.

FIG. 4 is a cross-sectional view showing an example of a conventional microswitch.

FIG. 5 is a sectional view showing another example of a conventional microswitch.

[Explanation of symbols]

2 Common fixed terminal piece 2i Fixed part 3 Fixed terminal piece 4 Fixed terminal piece 5 Movable contact piece 5a Base end 5b Contact 5d Elastic piece

Claims (1)

(57) [Claims] 1. A base end portion is supported on one side of a common fixed terminal,
The contact provided on the tip side can be connected to and separated from other fixed terminal pieces
Micro switch with movable contact piece arranged opposite
In addition, an elastic piece protruding toward the distal end side from the base end side of the movable contact piece is fixed to the common fixed terminal one side, and a fixing portion of the elastic piece on the common fixed terminal one side is connected to the elastic piece. A micro switch characterized by being formed wider than the above.