JPS6342408Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a switch mechanism in which a tension coil spring is mounted on a movable contact piece, and the movable contact piece is reversed by an external force via the tension coil spring to change the switch. In particular, an "arc-resistant part" is provided between the hook part of the tension coil spring attached to the movable contact piece and the contact part between the movable contact piece and the fixed contact, thereby preventing the arc that occurs when the switch is opened and closed. This invention relates to a switch mechanism that further improves opening/closing performance by not using a tension coil spring.

In conventional switch mechanisms of this type, there is no "arc-prone area" between the hook part of the tension coil spring and the contact part between the movable contact piece and the fixed contact, so the switch is opened and closed by that switch. If the load device is a resistive load that generates a relatively small arc when opening/closing, or an inductive load that generates a large arc, it may occur at the contact part during switch switching operation. The disadvantage is that the arc reaches the hook of the tension coil spring, causing the hook to melt and deform, or in some cases, the hook to melt and break, making it inoperable and resulting in an extremely shortened service life. Ta.

Note that arcs occur in the same way when the movable contact piece contacts and separates from the upper and lower fixed contacts.
In particular, when the arc reaches the side of the hook portion of the tension coil spring on which tensile force is constantly acting, deformation occurs and the problem is noticeable.

Examples of loads with large amounts of induction mentioned above include motors, transformers, relays, solenoids, etc.
Generates a relatively large arc. Furthermore, a DC high voltage will generate a larger arc than an AC power source, and if such a load is used, the switching performance conditions of the switch will be significantly reduced. .

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore, the purpose of the present invention is to solve the above-mentioned drawbacks of the conventional art by providing an arc-resistant part near the contact part that generates an arc. The object of the present invention is to provide a new switch mechanism that can eliminate the

According to the present invention, a movable contact piece is pivotally supported on a rising piece of a common terminal disposed on a switch base, and an actuating piece is provided at a position opposite to the movable contact piece with the rising piece sandwiched between the movable contact piece and the By installing a tension coil spring between the movable contact piece, the actuation piece or the tension coil spring itself is pressed by an external force to reverse the movable contact piece via the tension coil spring, and the In a switch mechanism for switching a fixed contact that comes into contact with a movable contact, an arc-prone portion is provided between a hook portion of a tension coil spring attached to the movable contact and a contact portion between the movable contact and the fixed contact. A switch mechanism is provided, which completely eliminates the aforementioned drawbacks.

Next, the main part of this invention is the "arc shield part"
Each favorable example will be specifically described with reference to the drawings.

Figures 1 to 5 are diagrams showing a first embodiment of a switch using the switch mechanism according to the present invention, of which Figure 1 is a sectional view of the main part, and Figure 2 is an exploded view of Figure 1. A perspective view, Figure 3 is an enlarged front view of the main parts,
FIG. 4 is an enlarged plan view of the main part (a plan view seen from above in FIG. 3), and FIG. 5 is an enlarged perspective view of the movable contact piece.
In the figure, reference numeral 1 indicates a housing, and a switch base 2 on which a switch mechanism according to the present invention is disposed is attached to the lower part of the housing 1, for example, by a concave-convex connection. An operating shaft consisting of a push button 3, a converter 4, and a support frame (not shown) for operating the above-mentioned switch mechanism according to the present invention is provided on the upper part of the housing 1. The support frames are connected to each other and are mounted so that they can be moved up and down, that is, in the longitudinal direction of the housing, by pressing the push button 3.
5 is an elastic piece for fixing the switch to a panel or the like.

On the switch base 2, there is an NC fixed contact piece 6 whose lower end becomes an NC contact terminal 6', an NO fixed contact piece 7 whose lower end becomes an NO contact terminal 7', and a rising piece whose lower end becomes a common terminal 8' and rises on both sides. 8 are formed respectively. A first notch 8a and a second notch 8b are formed on the side surface of the rising piece 8, and the other end of a movable contact piece 9 having a contact 9a at one end is engaged with the first notch 8a. On the other hand, one end of the actuating piece or spring receiving part 10 is engaged with the second notch 8b. Between the locking hole 9b of the movable contact piece 9 and the locking hole 10a of the actuating piece 10, a movable contact piece 9 and an actuating piece 10 are provided.
The main body of the tension coil spring 12 is disposed in the space 11 formed between the opposite end surfaces of the switch base 2, and the tension coil spring 12, which has a substantially central portion engaged with the protrusion 2a formed on the switch base 2, is held by the hook portions at both ends of the tension coil spring 12. It is mounted.

The engaging claw 4a provided on the converter 4 is connected to the operation plate 13.
is engaged with the engagement groove 13a formed in the operation plate 1.
The lower surfaces of the three horizontal operating pieces 13b and 13c are engaged with the upper surface of the operating piece 10.

In the above configuration, by pressing the push button 3, the converter 4 also moves downward together with the push button 3, and therefore,
The operating plate 13 engaged with the converter 4 via the engaging claw 4a is moved downward, and the horizontal operating piece 13
a and 13b push the end of the actuating piece 10 in the direction of the arrow in FIG. The contact 9a of the piece 9 comes into contact with the contact 7a of the fixed contact piece 7 due to the reversal action of the tension coil spring 12, and the switch is switched. When the pressure on push button 3 is removed, a return spring (not shown)
The operation shaft including the push button 3 is moved upward by the tension coil spring 12, and the contact relationship between the movable contact and the fixed contact also returns to the state shown in FIG. A heart cam 14 provided on the operation plate 13 constitutes a part of a lock control mechanism that controls the vertical movement of the operation plate 13.

Now, an arc is generated during the above-mentioned contact switching operation of the fixed contacts 6a, 7a and the movable contact 9a of the switch, but the present invention has an "arc-resistant part" to eliminate the adverse effects of this arc that occurs every time the switch is switched. is provided in the switch mechanism, and in the first embodiment shown in FIGS. It is formed to protrude as indicated by reference numeral 15. In this example, only one side of the hook (the side on which the tensile force is applied) is
is formed. When the contact 9a of the movable contact piece comes into contact with and separates from the lower fixed contact 7a, the arc reaches the lower part of the hook part of the coil spring 12, but according to the results of experiments, the arc reaches the lower part of the hook part of the coil spring 12. It has been confirmed that because no tensile force is directly applied to the sides, there is little deformation due to arcing.

FIG. 6 shows a second embodiment in which the "arc shielding part" of the present invention is partially modified, and in this example, the upper and lower two "arc shielding parts" 15a
are fixed together when the contact point 9a of the movable contact piece 9 is caulked, and are made to protrude upward and downward in the form of tongues.

Figure 7 shows the “arc end” in Figure 6.
This is a third embodiment in which the structure is further changed, and is an example in which the shape is cup-shaped (dish-shaped). This cup-shaped "arc shielding part" 15b is fixed to the contact 9a of the movable contact piece when the contact 9a is caulked. In this example,
A shielding effect can be obtained by preventing the arc from reaching the "hook".

Furthermore, as a fourth embodiment of the present invention, an extension (not shown) is provided approximately perpendicularly to the inner wall of the switch housing itself, for example, along the upper horizontal part of the fixed contact piece 6, and an upper contact is made to the end surface of this extension. (Contact 6
a, 9a) is provided with a tongue-shaped hanging part (not shown) that suppresses the arc, and also functions as a receiving part (supporting part) for the fixed contact piece 7 formed on the switch base. Lower contact part (contact 7
A tongue-like rising part (not shown) is formed to suppress the arc from a, 9a), and this rising part is inserted into a hole (not shown) provided near the contact point 7a of the fixed contact piece 7. It is possible to consider a configuration that is set up through Even with such a structure, it is possible to achieve the above-mentioned object of the present invention.

In the first embodiment shown in FIGS. 1 to 5, the operating piece 10 is pivotally supported in the second notch 8b provided on the left side of the rising piece 8 above the common terminal 8'. Although not necessarily limited to this, it is possible to attach the hook portion on the left side of the tension coil spring 12 to a “spring receiving portion” formed integrally with the common terminal without using an actuating piece, or to a spring receiving portion formed independently. May be installed.

Furthermore, although the drawings of the present invention show an example in which the contact is fixed to the fixed contact piece by caulking or the like, the contact may be left as a contact piece without being fixed.

Furthermore, the fixed contact may be provided only on either the upper or lower side. That is,
A single throw (single cut) type may also be used.

In addition to providing the "arc shield" of the present invention, the tension coil spring may be coated with an insulating film as an additional means. This means that a slight improvement in safety can be expected against melting deformation caused by arcing.

The present invention is constructed and operates as described above, and the following effects are produced according to the present invention.

(a) By providing an “arc shield”,
Since the arc when opening and closing the contact can be prevented from reaching the hook part of the tension coil spring and can be suppressed, there is no risk of melting, deforming or melting the hook part, and there is no possibility of interfering with the switching function of the switch. The opening/closing performance can be greatly improved.

(b) In particular, it does not cause any abnormality even when used for switching under loads that generate large arcs, such as inductive loads, and can be universally applied to various load usage conditions without restrictions.

(c) By providing an “arc shield”,
Since problems such as melting deformation and melting of the hook portion do not occur, the electrical life can be dramatically extended.

[Brief explanation of drawings]

Figures 1 to 5 show a first embodiment of the present invention, with Figure 1 being a sectional view of the main parts, Figure 2 being an exploded perspective view of Figure 1, and Figure 3 being an enlarged front view of the main parts. , FIG. 4 is an enlarged plan view of the main part, FIG. 5 is an enlarged perspective view of the movable contact piece, FIG. 6 is a perspective view of the main part showing the second embodiment of the present invention, and FIG. FIG. 7 is a perspective view showing a third embodiment. 1...Housing, 2...Switch base, 2
a, 2b... Protrusion, 3... Push button, 4... Converter, 4a... Engaging claw, 5... Elastic piece, 6... NC
Fixed contact piece, 6'... NC contact terminal, 6a... Fixed contact, 7... NO fixed contact piece, 7'... NO contact terminal, 7a... Fixed contact, 8... Rising piece, 8'...
... Common terminal, 8a, 8b ... Notch, 9 ... Movable contact piece, 9a ... Movable contact, 9b ... Engagement hole, 10
...Actuation piece, 10a...Engagement hole, 11...Space, 12...Tension coil spring, 12a, 12b...
... Hook part, 13 ... Operation plate, 13a ... Engagement groove, 13b, 13c ... Horizontal operation piece, 14 ... Heart cam, 15, 15a, 15b ... Arc shield part, 16 ... Light emitter, 17...Socket, 1
8...Sliding plate, 19...Lamp terminal.

Claims (1)

[Scope of utility model registration request] A movable contact piece is pivotally supported on a rising piece of a common terminal provided on a switch base, and an actuating piece provided at a position facing the movable contact piece with the rising piece sandwiched between the movable contact piece and the movable contact piece. By mounting a tension coil spring on the actuator, the actuating piece or the tension coil spring itself is pressed by an external force to reverse the movable contact piece via the tension coil spring, and then come into contact with the movable contact piece. In a switch mechanism for switching a fixed contact, a hook portion of a tension coil spring attached to the movable contact and/or both or either of the vertical direction of the movable contact between the contact portion of the movable contact and the fixed contact. A switch mechanism characterized by having an arc shield part on one side.