JPH0641299Y2 - Seesaw switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a seesaw switch capable of reliably wiping a movable contact.

[Prior Art] By sliding one end of a swingably supported knob on a substantially V-shaped swing contact plate, the swing contact plate is inverted and tilted, and is formed at both ends thereof. Well-known seesaw switches configured to selectively connect and disconnect one of the movable contacts to the corresponding fixed contact, and to ensure continuity between the movable contact and the fixed contact, clean these contact surfaces. Various wiping techniques have been devised.

[Problems to be Solved by the Invention] By the way, when the movable contact is connected to the fixed contact, the wiping is performed more reliably as the relative displacement between the two, that is, the wiping stroke becomes larger.

In addition, Japanese Utility Model Laid-Open No. 57-176028 discloses a swinging plate having a movable contact at one end to invert and tilt by moving a knob to close the contact and to perform wiping while moving in the longitudinal direction. There is. However, in the case of this structure, the fulcrum position shifts during wiping, so if it is applied to a seesaw switch of the type in which movable contacts are formed on both ends, contact failure may occur at the time of return. Further, since the oscillating plate moves in the longitudinal direction, it is necessary to expand the switch case in this direction, and it is difficult to make the switch compact in this direction. The present invention solves these problems.

[Means for Solving the Problems] In order to solve the above problems, a seesaw switch according to the present invention has a substantially V-shaped configuration, and both sides are engaged and supported by a fulcrum electrode by a swingably supported knob. In a seesaw switch configured to invert and tilt the rocking contact plate, and selectively move one of the movable contacts formed at both ends of the movable contact to and from the corresponding fixed contact, facing the movable contact side. It is characterized in that the moving knob and a guide portion obliquely intersecting the movement locus are formed on the swing contact plate so as to project therefrom.

[Operation of the Invention] When the knob is rocked to move the sliding contact with the rocking contact plate to the normally open movable contact side, the rocking contact plate is inverted and tilted. Therefore, when the knob continues to swing, the guide portion comes into contact with the knob from the side, so the swing contact plate does not change the fulcrum position,
Rotate in a direction substantially orthogonal to the moving direction of the knob in plan view,
Wiping is performed while moving the contact position between contacts.

[Embodiment] FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 shows a side view of a seesaw switch, in which a normally closed movable contact 2 and a normally open movable contact 3 are formed at both ends of a rocking contact plate 1 made of a substantially V-shaped conductor. Further, as is apparent from FIG. 2 showing the planar shape of the swinging contact plate 1 on the side of the normally open movable contact 3, a notch groove 4 is formed on both sides of the central portion, and the normally open movable contact 3 is further displaced. A guide portion 5 is formed in a cut-and-raised shape from one side, and is formed in a substantially triangular shape as shown in FIG. 3 showing the X direction of FIG. In the width direction toward the center and higher than the general surface of the oscillating contact plate 1, and as a result, a tapered surface 6 (see FIG. 2) is formed which is inclined with respect to the longitudinal direction of the oscillating contact plate 1. It is oblique to the movement trajectory of the oscillating contact plate 1.

Again, as shown in FIG. 1, a fulcrum electrode 7 having a bifurcated tip at a position corresponding to the cutout groove 4 below the oscillating contact plate 1.
Is erected, and the forked portion of the tip is engaged with the notch groove 4. Further, a normally open fixed contact 8 and a normally closed fixed contact 9 corresponding to the normally open movable contact 3 and the normally closed movable contact 2 are provided. A knob 11 is swingably supported above the swing contact plate 1 by a shaft 10 whose both ends are supported by a switch case (not shown).

An in / out pin 12 is provided at the bottom of the knob 11 so that it can be freely in and out
The in-out pin 12 is urged by a spring 13 so as to project toward the swing contact plate 1. The input / output pin 12 slides on the oscillating contact plate 1 as the knob 11 oscillates, and inverts the oscillating contact plate 1 with the engaging portion of the fulcrum electrode 7 as a fulcrum.

As shown in FIG. 2, the tapered surface 6 gradually enters from the side toward the normally open movable contact 3 side, and the in / out pin 12
It is designed to interfere with the trajectory of the
The position that interferes with is the position of the input / output pin 12 immediately after the oscillating contact plate 1 is inverted and tilted.

Next, the operation of this embodiment will be described. The state shown by the solid line in FIG. 1 is the normal state in which the normally closed movable contact 2 and the normally closed fixed contact 9 are connected, and the normally open movable contact 3 and the normally open fixed contact 8 are open, and the knob 11 is upright. The entrance / exit pin 12 is on the central bent portion of the swing contact plate 1. Therefore, when the knob 11 is tilted counterclockwise in the figure, the knob 11 swings around the shaft 10, and the input / output pin 12 swings counterclockwise on the contact plate 1 as well.
Slide toward. Exit pin 12 has fulcrum electrode 7 and notch groove 4
After passing the engaging portion with, the oscillating contact plate 1 tilts reversely, the normally open movable contact 3 and the normally open fixed contact 8 are connected, and conversely, the normally closed movable contact 2 and the normally closed fixed contact 9 open. This state is shown by the phantom line in FIG. 1 and the solid line in FIG. At this time, the tip of the loading / unloading pin 12 starts contact with the tapered surface 6.

Therefore, when the swinging of the knob 11 is further continued, as shown by the phantom lines in FIGS. 2 and 3, the entrance / exit pin 12 begins to largely interfere with the taper surface 6, whereby the entrance / exit pin 12 moves in the moving direction. On the other hand, since a force is applied in a substantially orthogonal direction, the oscillating contact plate 1 rotates in the plane including the oscillating contact plate 1 to the left in FIG. 3 in this embodiment. At this time, the contact portions of the normally open movable contact 3 and the normally open fixed contact 8 are displaced to the left from the initial position by a large amount.

In this way, the swing contact plate 1 is rotated by the interference of the guide portion 5, the tapered surface 6 and the in-out pin 12, so that the normally open movable contact 3 formed on the tip end side thereof moves largely. Therefore, if there is a foreign substance that is welded or adhered between the normally open movable contact 3 and the normally open fixed contact 8, these are removed when the normally open movable contact 3 moves, and wiping is performed. At this time, the wiping stroke S (see FIG. 3) can be ensured as much as necessary and sufficient within the contact surface of the normally open fixed contact 8 with respect to the normally open movable contact 3 to enable wiping, and the fulcrum position during wiping. Since it does not shift, when the knob 11 is returned to the neutral position, the contact connection between the normally closed movable contact 2 and the normally closed fixed contact 9 can be ensured, and it is necessary to expand the switch case in the longitudinal direction of the swing contact plate 1. Since there is no, the switch can be made compact in this direction.

Further, the force for operating the knob 11 directly acts on the contact portion of the normally open movable contact 3 with the normally open fixed contact 8 via the entrance / exit pin 12 and the tapered surface 6. Moreover, wiping is performed after the normally-open movable contact 3 comes into contact with the normally-open fixed contact 8 or at the same time in a state where the contact pressure is high, so that the wiping becomes more reliable. When the entrance / exit pin 12 returns, there is no interference with the guide portion 5, so that it can move smoothly.

The present invention is not limited to the above-described embodiment, and various applications and the like are possible. For example, the guide portion 5 may be formed so as to project from the back surface of the swing contact plate 1 by pressing.

[Effect of the Invention] Since the seesaw switch according to the present invention rotates the swing contact plate in the plane including the swing contact plate after being inverted and tilted, the wiping stroke can be increased and the contact between the contacts can be reliably performed. Wiping can be performed.

In addition, when performing wiping, the fulcrum position does not move compared to the type in which the oscillating contact plate is moved in the movement direction of the knob, and it is possible to prevent a return failure when tilting and reversing and returning, and the reliability of the switch. Since it is not necessary to expand the switch case in the longitudinal direction of the oscillating contact plate, the switch can be made compact in this direction.

[Brief description of drawings]

1 to 3 show an embodiment, FIG. 1 is a side view, FIG. 2 is a plan view of an essential part, and FIG. 3 is an X view of FIG. (Description of symbols) 1 ... Oscillating contact plate, 2 ... Normally closed movable contact, 3 ... Normally open movable contact, 5 ... Guide part, 7 ... Support electrode, 8 ... Normally open fixed contact, 9 ...... Normally closed fixed contact, 11 …… Knob, 12 …… Incoming and outgoing pin.

Claims (1)

[Scope of utility model registration request] 1. A swinging contact plate, which is substantially V-shaped and whose both sides are engaged and supported by a fulcrum electrode, is inverted and tilted by a knob which is swingably supported, and movable on both ends thereof. In a seesaw switch configured to selectively bring one of the contacts into and out of contact with a corresponding fixed contact, the knob that moves toward the movable contact side and the guide portion that obliquely intersects the movement locus are provided. A seesaw switch characterized in that the swing contact plate is formed to project.