JP2002056734A - Contact point structure of switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact point structure of a switch wherein a degree of freedom of layout is enlarged in case of arranging and installing at a case and downsizing of the switch can be attained and a cost can be reduced, while yield of material is improved in the contact point structure. SOLUTION: A stationary terminal 3 and a central terminal 4 opposingly arranged and installed at an inner bottom face of a housing part installed at the case 1, and a conductor plate 6 to whose one side a movable contact point 5 is fixed and which is movably supported by the central terminal 4 are equipped, and the stationary terminal 3 is mounted on the inner bottom face of the case 1 erected again in a direction of the material length, and a stationary contact point 2 connected and separated with the movable contact point 5 is fixed on a fracture surface 3e at an upper end part of the stationary terminal 3 erected again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact structure of a switch used for a power switch or the like of an electronic apparatus, and more particularly to a fixing structure of a contact fixed to a fixed terminal or the like.

[0002]

2. Description of the Related Art As a conventional contact structure of a power switch or the like, a fixed terminal which is a part of a contact mechanism is formed by pressing a conductive metal plate. This fixed terminal is made of a noble metal such as gold or silver to reduce arcs and the like that occur when the switch is switched when high voltage and high current are applied and to stabilize the contact of the contacts. The fixed contact is fixed.

In order to fix the fixed contact to the fixed terminal, the side of the fixed terminal to which the contact is fixed is bent in a direction perpendicular to the lead-out direction of the wiring terminal. The fixed contact is fixed by caulking on the flat surface.

In this case, a contact crimping hole is formed in a plane to which the contact of the fixed terminal is fixed, and a contact material made of a noble metal containing gold or silver serving as a fixed contact is inserted into the hole to fix the contact. A fixed contact is formed and fixed by performing a press working in a material width (plate thickness) direction of the terminal with a mold or the like.

[0005]

However, in the contact structure of the conventional switch described above, when the fixed contact is fixed to the fixed terminal, the fixed contact is fixed by caulking in the material width (plate thickness) direction of the fixed terminal. Therefore, it is necessary to perform bending work in a right angle direction to make the fixed terminal serving as the base a flat shape, which reduces the degree of freedom of layout when arranging it in the case and reduces the size of the case. There is a problem that the size of the switch cannot be reduced because it becomes large.

In addition, since the fixed terminal is fixed to the flat surface by bending the fixed terminal, there is a problem that the yield of the material of the fixed terminal is deteriorated and the cost is increased.

Therefore, the present invention solves the above-mentioned problems, and the contact structure of the switch increases the degree of freedom in layout when the switch is arranged in a case, thereby reducing the size of the switch and improving the material yield. An object of the present invention is to provide a contact structure capable of reducing costs.

[0008]

According to the present invention, as a first means for solving the above-mentioned problems, as a first means, a fixed terminal and a center terminal which are disposed opposite to each other on an inner bottom surface of a storage portion provided in a case. And a conductive plate having a movable contact fixed to one end thereof and movably supported by the central terminal, wherein the fixed terminal is attached to the inner bottom surface of the case in a material grain direction, and is fixed. A fixed contact that comes into contact with and separates from the movable contact is fixed on a fractured surface at the upper end of the fixed terminal.

As a second means, a notch is formed at the distal end of the fixed terminal so as to penetrate in the material width direction, and one end of the fixed contact is fixed to the notch by caulking. .

[0010] The swaged portion of the fixed contact is formed in the material width direction of the fixed terminal.

Further, the fixed contact is formed of a chip-shaped round wire.

[0012]

1 to 6 show an embodiment of a contact structure of a switch according to the present invention. 1 is a longitudinal sectional view of the switch device, FIG. 2 is a plan view of a fixed terminal, FIG. 3 is a front view of the same, FIG. 4 is a side view of the same, FIG. FIG. 6 is an explanatory view showing a caulking step.

In FIG. 1, a switch device comprises a case 1 made of an insulating material such as a synthetic resin, a fixed terminal 3 provided on the inner bottom surface of the case 1 and having a fixed contact 2 on the upper surface.
A central terminal 4 adjacent to the fixed terminal 3 and also disposed on the inner bottom surface of the case 1; and a movable contact 5 movably supported by the central terminal 4 and having one end capable of coming into contact with and separating from the fixed terminal 3.
A support arm 7 which is locked to the conductor plate 6 and the center terminal 4 and movably supports the conductor plate 6
And a torsion coil spring 8 that is bent and locked between the conductor plate 6 and the central terminal 4 and drives the conductor plate 6 by its own bending / extending operation, and is driven in contact with the conductor plate 6. An operating surface portion 9a for displacing the conductor plate 6 in the direction of the fixed terminal 3 or in the direction away from the fixed terminal 3
And a slide member 9 having the following.

The central terminal 4 made of a conductive metal plate or the like;
In the figure, a support arm locking projection 4a for locking the support arm 7 and a spring locking projection 4b for locking the torsion coil spring 8 are formed. The support arm locking projections 4a and the spring locking projections 4b are provided with locking grooves 4c and 4d at positions substantially opposed to each other. 7 and torsion coil spring 8
Are locked at one end.

The support arm 7 is made of a conductor round wire and has a substantially U shape.
One end is locked in the locking groove 4c of the supporting arm locking protrusion 4a, and the other end is locked in the vicinity of the movable plate 5 fixed side of the conductor plate 6. I have.

The conductor plate 6 is made of a conductor metal plate,
An opening is provided at the center where the support arm locking projection 4a and the spring locking projection 4b can be loosely fitted, and the movable contact 5 is provided at one end. One end of the support arm 7 is locked to one end of the conductive plate 6, and the other end is locked to the torsion coil spring 8, and is movably attached to the center terminal 4. The other end of the conductor plate 6 is provided with the operating surface 9 when the slide member 9 slides.
The contact portion 6a is formed in contact with the contact member a to drive the conductor plate 6.

The torsion coil spring 8 is formed of a round wire made of a conductor having spring properties, one end of which is locked by a locking groove 4d of a spring locking projection 4b of the central terminal 4, and the other end thereof. Is locked to the other end of the conductor plate 6 opposite to the one end to which the support arm 7 is locked. The torsion coil spring 8 is disposed to be bent between the center terminal 4 and the conductor plate 6.

When assembling the contact mechanism of the switch device, the support arm 7 is attached to one end of the conductor plate 6 in order to movably attach the conductor plate 6 to the center terminal 4 in a loosely fitted state. One end is locked, and the other end of the support arm 7 is locked to the support arm locking projection 4a of the central terminal 4. The torsion coil spring 8 is attached in a state of being bent between the locking projection 4b. At this time, the torsion coil spring 8 is connected to the support arm 7.
The conductor plate 6, the support arm 7, and the torsion coil spring 8 are integrally attached to the center terminal 4 so that the conductor plate 6 and the center terminal 4 are resiliently attached. It is movably attached to the terminal 4.

The operation of the switch device will be described. When the slide member 9 is pressed, the slide member 9 slides in the pressing direction (rightward in the figure), and the operation surface 9a of the slide member 9 moves the slide member 9 to the right. The contact portion 6a of the conductor plate 6 is pressed, and the torsion coil spring 8 is rotated counterclockwise about the locking groove 4d of the spring locking projection 4b of the central terminal 4. At this time, the conductor plate 6 and the support arm 7 move downward in the drawing with the locking groove 4c of the support arm locking projection 4a of the central terminal 4 as a fulcrum.
When the locking portion with the torsion coil spring 8 exceeds the locking groove 4c (reversal point of the torsion coil spring 7) of the support arm locking projection 4a, the conductor plate 6 self-runs downward in the figure. Then, the movable contact 5 comes into contact with the fixed contact 2 and the circuit is turned on. At this time, the slide member 9 is locked at the pushing position.

When the slide member 9 is further pressed from this state, the lock is released, and the slide member 9 returns to the direction opposite to the pressing direction (leftward in the figure) by the urging force of the return spring 10. At this time, the torsion coil spring 8 is rotated clockwise, and when the torsion coil spring 8 exceeds the reversal point, the conductor plate 6 self-runs upward in the drawing and the movable contact 5 moves to the fixed contact 2. And the circuit is turned off.

Next, the structure of the fixed terminal 3 of the switch device will be described with reference to FIGS. The fixed terminal 3 is formed of a conductive metal plate in a substantially T-shaped flat plate shape. A center portion of the fixed terminal 3 has a slightly wide rectangular base 3a and one end of the base 3a. And a slender wiring terminal portion 3b provided at the end of the line.

A cutout 3d having a hook 3c is formed on the other end of the base 3a facing the terminal 3b, and the fixed contact 2 is formed in the cutout 3d.
Is inserted and fixed. In this case, the notch 3d is formed so as to penetrate in the material width (plate thickness) direction of the fixed terminal 3, and the notch 3d
One end of the fixed contact 2 is inserted from a direction (direction indicated by an arrow in FIG. 5) orthogonal to the material width (thickness) direction, and this one end is connected to the material width (thickness) of the fixed terminal 3. ) Is caulked and fixed from the left and right direction (the direction indicated by the arrow in FIG. 6) by the mold 11 that can move in the direction (1).

At this time, the fixed contact 2 is rolled and deformed in the material width (sheet thickness) direction of the fixed terminal 3 by crimping one end of the fixed contact 2, and the crimped portion 2a is formed by a hook 3c of the cutout 3d. , The fixed contact 2 is securely fixed on the fractured surface 3 e which is the upper end of the fixed terminal 3.

The fixed contact 2 is formed of a round contact wire made of a noble metal containing gold, silver or the like, and the fixed wire 2 is formed by cutting the contact wire into chips. It is something to be done. For this reason, the process of processing the fixed contact 2 is simplified, and the cost can be reduced.

The fixed terminal 3 is attached to the inner bottom surface of the case 1 in a state of being erected in the direction of the material grain, and the fixed contact 2 is provided on a broken surface 3e which is the upper end of the erected fixed terminal 3. Is fixed.

According to the structure of the fixed terminal 3, the surface for fixing the fixed contact 2 is not the surface of the fixed terminal 3 in the material width (plate thickness) direction but the material width (plate thickness) direction. Is provided on the fractured surface 3e, which is the upper end of the orthogonally fixed terminal 3, so that the fixed terminal 3 does not need to be bent in a right angle direction. Therefore, when the fixed terminal 3 is disposed in the case 1, the degree of freedom in layout is increased, and the size of the switch can be reduced.

Further, the plane to which the fixed contact 2 is fixed is
Since it is not necessary to provide the fixed terminal 3 by bending, the yield of the material of the fixed terminal 3 is improved, and the cost can be reduced.

[0028]

As described above, according to the switch contact structure of the present invention, the fixed terminal provided on the inner bottom surface of the storage portion provided on the case is erected on the inner bottom surface of the case in the material direction. The fixed contact that comes into contact with and separates from the movable contact is fixed on the fractured surface at the upper end of the fixed terminal that has been turned upside down. Therefore, since the fixed terminals can be disposed on the inner bottom surface of the case, the degree of freedom in layout when the fixed terminals are disposed in the case is increased, and the size of the switch can be reduced.

Further, a cutout portion penetrating in the material width direction is formed at the tip of the fixed terminal, and one end of the fixed contact is caulked and fixed to the cutout portion. Since it is not necessary to provide the fixed terminal by bending, the yield of the material of the fixed terminal is improved, and the cost can be reduced.

Further, since the swaged portion of the fixed contact is formed in the material width direction of the fixed terminal, the swaged portion is rolled and deformed in the material width (sheet thickness) direction of the fixed terminal, and the swaged portion is formed in the notch. By being engaged, the fixed contact is securely fixed on the fractured surface which is the upper end of the fixed terminal.

Also, since the fixed contact is formed of a chip-shaped round wire, it is only necessary to cut the contact wire of the round wire into a chip shape, and the process of processing the fixed contact is simplified and the cost is reduced. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a switch device using a fixed terminal according to one embodiment of the present invention.

FIG. 2 is a plan view showing the same fixed terminal of the present invention.

FIG. 3 is a front view showing the same fixed terminal of the present invention.

FIG. 4 is a side view showing the same fixed terminal of the present invention.

FIG. 5 is a relationship diagram showing a state before the fixed contact is fixed to the fixed terminal according to the present invention.

FIG. 6 is an explanatory view showing a step of caulking a fixed contact to the fixed terminal according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Fixed contact 2a Caulking part 3 Fixed terminal 3a Base part 3b Terminal part 3c Hook part 3d Notch part 3e Breaking surface 4 Central terminal 4a Support arm locking projection 4b Spring locking projection 4c, 4d Locking groove 5 Movable contact 6 Conductor plate 6a Contact part 7 Support arm 8 Torsion coil spring 9 Slide member 9a Working surface 10 Return spring 11 Mold

Claims (4)

[Claims] 1. An inner bottom surface of a storage portion provided in a case,
A fixed terminal and a central terminal disposed opposite to each other, and a movable contact is fixed to one end side, and a conductor plate movably supported by the central terminal, the fixed terminal is provided on an inner bottom surface of the case. A contact structure for a switch, wherein the fixed contact is mounted so as to be upright in the direction of the material, and a fixed contact that comes into contact with and separates from the movable contact is fixed on a broken surface of an upper end portion of the fixed terminal that has been turned up. 2. A notch portion penetrating in a material width direction is formed at a tip of the fixed terminal, and one end of the fixed contact is caulked and fixed to the notch portion.
The contact structure of the switch described. 3. The switch contact structure according to claim 2, wherein the swaged portion of the fixed contact is formed in a material width direction of the fixed terminal. 4. The contact structure for a switch according to claim 1, wherein the fixed contact is formed of a chip-shaped round wire.