JP2731408B2 - Seesaw switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention includes a handle having an operation surface exposed on one surface of a main body and pivotally supported by the main body so as to swing in a direction substantially perpendicular to the one surface, and contacts are opened and closed with the swing of the handle. It relates to a seesaw switch.

[Prior art]

Generally, a seesaw switch of this type includes a handle 2 pivotally supported on a main body 1 as shown in FIG.
The movable contact 3 oscillating with the oscillating motion is connected via a reversing spring 6. The movable contact 3 is pivotally supported by a support terminal 4 fixed to a fixed position of the main body 1 and is swingable. A movable contact 31 is provided at the tip of the movable contact 3. In addition, a fixed contact terminal 5 having a fixed contact 51 is provided at a fixed position of the main body 1, and the movable contact 31 comes into contact with and separates from the fixed contact 51 as the movable contact 3 swings. That is, when the handle 2 is swung, the reversing spring 6 is configured to be compressed most at an intermediate position of the swing range of the handle 2. 3 swings.

[Problems to be solved by the invention]

By the way, when slight welding occurs between the movable contact 31 and the fixed contact 51, the movable contact 31 cannot be separated from the fixed contact 51 only by the spring force of the reversing spring 6, and the operation of the handle 2 Nevertheless, it may happen that the pole cannot be opened. In order to solve this problem, a pivot 35 which is a synthetic resin molded product is provided for the movable contact 3, and the pivot 35 is provided in a holding cylinder 23 provided on the handle 2 so as to hold the upper end of the reversing spring 6. Has been considered. When welding occurs between the movable contact 31 and the fixed contact 51,
When the handle 2 is operated, the pivot 35 is attached to the inner peripheral surface of the holding cylinder 23.
Is pressed, and the pressing force acts directly on the movable contact 3 from the handle 2, so that the movable contact 31 can be forcibly opened from the fixed contact 51. However, in this configuration, since the pivot 35 needs to be formed integrally with the movable contact 3, the configuration is complicated and processing is difficult, and the pivot 35 is used as a spring seat of the reversing spring 6. Therefore, there is a problem that the reversing spring 6 becomes short in the limited space in the main body 1. The present invention is aimed at solving the above problems,
Even if slight welding occurs between the movable contact and the fixed contact, the contact can be opened by applying a direct force to the movable contact from the handle, and the movable contact can be easily It is an object of the present invention to provide a seesaw switch which can be easily processed and can have a long reversing spring.

[Means for Solving the Problems]

In the present invention, in order to achieve the above object, a pressing projection protruding toward the movable contact is provided on the handle at a portion different from the coupling portion of the reversing spring, and one end of the reversing spring and the pressing member are provided on the movable contact. When the projection is inserted and the handle swings in a direction for separating the movable contact from the fixed contact, the recess is formed to receive a force in a direction of contacting the pressing projection and separating the movable contact from the fixed contact. It is.

[Action]

According to the above configuration, when the handle is operated in a direction to separate the movable contact from the fixed contact, even if slight welding occurs between the movable contact and the fixed contact, the handle is pressed with the swing of the handle. The protrusion presses the inner peripheral surface of the recess,
The contact can be forcibly opened by applying a force directly to the movable contact from the handle. In addition, since the recess is formed in the movable contact, the number of components can be reduced in realizing the function of forcibly opening the contact. Further, one end of the reversing spring is inserted into a recess provided in the movable contact, and a pressing projection is protruded at a position different from the joint of the reversing spring in the handle, so that the movable contact is forcibly moved from the fixed contact. With this configuration, the reverse spring is not shortened, and the contact pressure can be increased and the size can be reduced.

Embodiment 1 FIGS. 1 to 4 show an embodiment. The main body 1 is formed of a synthetic resin in the shape of a square cylinder with a bottom opening to the top, and a flange 11 is formed at the upper end edge. Below the flange 11, on both longitudinal side surfaces of the main body 1, there are provided spring pieces 12 whose upper and lower ends are integrally connected to the main body 1 and whose intermediate portion projects away from the main body 1. Therefore,
When fixing the main body 1 to a mounting panel or the like, the main body 1 is inserted into a mounting hole drilled in the mounting panel or the like, and the peripheral edge of the mounting hole is sandwiched between the flange 11 and the spring piece 12 from the front and back. It is good. The lower half inside the main body 1 is a partition wall
13 separates the main body 1 into two chambers in the width direction. Further, a cross-shaped partition wall 14 is integrally formed on the lower surface of the main body 1, and the lower surface of the main body 1 is divided into two sections in the longitudinal direction and the width direction, respectively, so that a total of four sections are provided. A handle 2 which is a synthetic resin molded product is pivotally supported on the upper part of the main body 1. That is, the handle 2 is provided with the rotating shafts 21 integrally protruding from both sides in the width direction of the main body 1, and the rotating shafts 21 are fitted into the shaft holes 15 formed in the peripheral wall of the main body 1, whereby the main body 1 is rotated. Are pivotally supported so as to be able to swing vertically. The upper surface of the handle 2 is an operation surface 22, which is a curved surface whose central portion is recessed. The handle 2 is formed in a tubular shape whose lower surface is opened, and a holding cylinder 23 whose lower surface is opened is provided in the handle 2 and projects downward. Two holding cylinders 23 are provided so as to respectively correspond to the respective chambers divided by the partition wall 13, and each of the holding cylinders 23 is orthogonal to the rotation shaft 21 at the midpoint position of the swing range of the handle 2. It protrudes in a direction inclined with respect to the opening surface of the main body 1 in the plane. Here, the holding cylinder 23 is provided so that the center line 1 of the holding cylinder 23 intersects with the center line of the rotating shaft 21. The inner bottom surface of the holding cylinder 23 is formed so as to be located higher than the center line of the rotating shaft 21. A hemispherical spring receiving projection 24 protrudes from the center of the inner bottom surface of the holding cylinder 23, and a pressing projection 25 is provided at an opening edge of the holding cylinder 23. Each holding cylinder
One end of a reversing spring 6 composed of a coil spring is inserted into 23, and one end of the reversing spring 6
24 is inserted to prevent displacement. In addition, since the position of the reversing spring 6 is stabilized by forming the spring receiving projection 24, the inner bottom surface of the holding cylinder 23 can be inclined with respect to the center line 1 of the holding cylinder 23. 2, the thickness of the handle 2 can be made substantially constant, so that the occurrence of sink marks and the like can be prevented, and the handle 2 can be beautifully finished. The other end of the reversing spring 6 is connected to the movable contact 3.
The movable contact 3 is formed of a conductive sheet metal,
A contact holding piece 32 provided with a movable contact 31 on the lower surface of one end, and a substantially U-shaped spring receiver which is connected to the other end of the contact holding piece 32 and is open upward and into which the other end of the reversing spring 6 is inserted. And a piece 33. A locking hole 34 is formed in the center of the spring receiving piece 33. The movable contact 3 is pivotably supported on a support terminal 4 inserted through the bottom plate of the main body 1. Support terminal 4
Is provided with a terminal piece 41 formed of conductive sheet metal and protruding from the lower surface of the main body 1, and a support piece 42 bent from the upper end of the terminal piece 41 along the inner bottom surface of the main body 1. Piece
Locking projections 43 are provided on both side edges of the projection 42, respectively. One of the locking projections 43 is inserted into the locking hole 34 of the movable contact 3 to prevent the movable contact 3 from being displaced with respect to the support terminal 4, and the locking projection 43 is inverted. By being inserted into the other end of the spring 6, the displacement of the reversing spring 6 is also prevented. In addition, the movable contact 3
Abuts the edge of the side edge of the support piece 42 against the support terminal 4;
Since the swing is made with the edge as a fulcrum, the fulcrum position is stabilized. Incidentally, two support terminals 4 are provided, and are arranged symmetrically with the partition wall 13 interposed therebetween. Here, as described above, since the locking projections 43 are projected from both end edges of the support piece 42, the support terminals 4 are formed in a symmetrical shape with respect to the center line. The terminals 4 have the same shape. As a result, only one type of support terminal 4 is provided, and an increase in the number of types of components can be prevented. Also, there is no risk of reverse assembly during assembly. The fixed contact terminal 5 is also inserted through the bottom plate of the main body 1.
The fixed contact terminal 5 includes a terminal piece 52 exposed on the lower surface of the main body 1.
And a contact holding piece 53 provided with a fixed contact 51 facing the movable contact 31 and bent from the upper end of the terminal piece 52 along the inner bottom surface of the main body 1. Here, the fulcrum position of the rotary contact 3 and the fixed contact 51 are disposed on the opposite side of a plane orthogonal to the opening surface of the main body 1 and including the rotation shaft 21. Therefore, the distance from the fulcrum position of the movable contact 3 to the movable contact 31 can be increased under the restriction of the internal space of the main body 1, and as a result, the opening distance of the movable contact 31 to the fixed contact 51 can be increased. You can take it. Further, as described above, the movable contact 3 is formed by projecting the contact holding piece 32 substantially perpendicularly from the tip of one leg of the substantially U-shaped spring receiving piece 33. In comparison with the case where the movable contact 3 is formed in the shape of a circle, the rotation angle of the movable contact 3 around the fulcrum can be increased, and even with this configuration, the opening distance of the movable contact 31 with respect to the fixed contact 51 can be reduced. You can make it bigger. The fixed contact terminal 5 is a support terminal 4
Similarly, the pair is symmetrically arranged with the partition wall 13 interposed therebetween, and both fixed contact terminals 5 are formed in the same shape. Therefore, the movable contact 3, the support terminal 4, the fixed contact terminal 5, and the reversing spring 6 are shared between the case of the double pole single throw configuration as in the present embodiment and the case of the single pole single throw configuration. can do. The terminal pieces 41 and 52 of the support terminal 4 and the fixed contact terminal 5 are exposed to the respective sections partitioned by the partition walls 14 and are isolated from each other. As described above, since there are relatively few types of components and each component can be assembled to the main body 1 from above, automatic assembly becomes easy. Next, the operation will be described. As shown in FIG. 2A, when the movable contact 31 is in contact with the fixed contact 51, the spring force of the reversing spring 6 acts to rotate the handle 2 counterclockwise. Contact pressure is applied. When the right end of the operation surface 22 is pressed downward from this state, the handle 2 rotates clockwise, and presses the intermediate portion of the reversing spring 6 leftward. In the middle part of the swing range of the handle 2,
Since the distance between the inner bottom surface of the holding cylinder 23 of the handle 2 and the fulcrum of the movable contact 3 is minimized, the reversing spring 6 is compressed so as to become the shortest. The spring force of the reversing spring 6 acts so as to urge the counterclockwise 2. That is, the snap operation is performed by the spring force of the reversing spring 6. Here, since both ends of the reversing spring 6 are displaced in a direction parallel to the opening surface of the main body 1 and perpendicular to the rotation axis 21, the length of the reversing spring 6 can be increased. The number of turns can be increased. Therefore, the reversing spring 6
Can be reduced, and the difference between the spring force when the movable contact 31 is in contact with the fixed contact 51 and the spring force when the reversing spring 6 is compressed most is reduced. be able to. As a result, the contact pressure can be increased with respect to the force required for operating the handle 2. Further, in the present configuration, if the reversing spring 6 is shortened, the whole can be downsized while obtaining a predetermined contact pressure. The pressing protrusion 25 provided on the lower end of the handle 2 is inserted into a spring receiving piece 33 provided on the movable contact 3, and when the handle 2 is operated in a direction to open the movable contact 31 from the fixed contact 51, When slight welding occurs between the movable contact 31 and the fixed contact 51, the pressing projection 25 comes into contact with the inner peripheral surface of the spring receiving piece 33 and is movable from the handle 2 without the interposition of the reversing spring 6. The contact 3 is directly pressed, whereby the movable contact 31 can be forcibly separated from the fixed contact 51. That is, the spring receiving piece 33 functions as a recess into which the pressing projection 25 is inserted.
In the state where the movable contact 31 is separated from the fixed contact 51, the tip of the contact holding piece 32 is inserted into the handle 2 as shown in FIG. The creepage distance from the contact 3 can be increased.
That is, the insulation performance can be improved and the safety can be improved. Also, a part of the movable contact 3 is
There is also an advantage that the entire height can be reduced because it can be inserted into the inside.

Second Embodiment In the first embodiment, a two-pole single-throw switch is disclosed.
In this embodiment, a two-pole double-throw type is used. That is, as shown in FIG. 5, a pair of fixed contact terminals 5 each having a fixed contact 51 are provided in a direction parallel to the opening surface of the main body 1 and orthogonal to the center line of the rotating shaft 21. The support terminal 4 is provided in the middle of the contact terminal 5. The movable contact 3 is formed in a shape in which the contact holding pieces 32 project substantially at right angles from the ends of both legs of the substantially U-shaped spring receiving piece 33 opened upward. The movable contact 31 provided on the lower surface selectively contacts one of the fixed contacts 51 provided on each of the fixed contact terminals 5. At the lower end of the handle 2, a pressing projection 25 is projected, and since the pressing projection 25 is inserted into the spring receiving piece 33, the movable contact 31 and the fixed contact 51 are slightly welded. In such a case, the pressing projection 25 is
It is possible to forcibly open the electrode by pressing the inner peripheral surface of 33. Since the basic operation is the same as in the first embodiment,
Description is omitted.

【The invention's effect】

According to the present invention, as described above, the handle is provided with a pressing projection protruding toward the movable contact at a portion different from the coupling portion of the reversing spring, and one end of the reversing spring and the pressing projection are inserted into the movable contact. And a recess that receives a force in a direction to separate the movable contact from the fixed contact by contacting the pressing projection when the handle swings in a direction to separate the movable contact from the fixed contact. When the handle is operated in a direction to separate the movable contact from the fixed contact, even if slight welding occurs between the movable contact and the fixed contact, the pressing protrusion may be indented with the swing of the handle. Since the inner peripheral surface is pressed, there is an advantage that the contact can be forcibly opened by directly applying a force to the movable contact from the handle. Also,
Since the recess is formed in the movable contact, there is an advantage that the number of components can be reduced in realizing the function of forcibly opening the contact. Further, one end of the reversing spring is inserted into a recess provided in the movable contact, and a pressing projection is protruded at a position different from the joint of the reversing spring in the handle, so that the movable contact is forcibly moved from the fixed contact. With this configuration, the reverse spring is not shortened, and the contact pressure can be increased and the size can be reduced. That is, if the reversing spring is made longer, the spring constant of the reversing spring becomes smaller, so that the contact pressure can be increased when the operating force of the handle is the same as compared with the reversing spring having a shorter reversing spring. Also, if the length of the reversing spring is made the same as in the conventional configuration, the size can be reduced by the amount of the pivot.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention, FIG. 2 (a) is a longitudinal sectional view showing the same ON state, and FIG. 2 (b).
FIG. 3 is a longitudinal sectional view showing the same OFF state, FIG. 3 is a transverse sectional view of the same, FIG. 4 is a side view of the same, FIG. 5 is a sectional view showing a second embodiment of the present invention, and FIG. It is sectional drawing which shows an example. 1 ... body, 2 ... handle, 3 ... movable contact, 4 ...
... Support terminals, 5 ... Fixed contact terminals, 6 ... Reversing springs, 22
…… Operation surface, 25 …… Pressing projection, 31 …… Movable contact, 33 ……
Spring receiving piece, 51 ... fixed contact.

Claims (1)

(57) [Claims] A handle having an operation surface exposed on one surface of the main body and pivotally supported by the main body so as to swing in a direction substantially perpendicular to the one surface; and a fixed contact fixed to a fixed position of the main body. A movable contact having a fixed contact terminal, a support terminal fixed at a fixed position of the main body, a movable contact pivotally supported on the support terminal, and a movable contact separated from and fixed to the fixed contact with the swing; A reversing spring that is coupled to the handle and the other end is coupled to the movable contact so as to swing the movable contact with the swing of the handle and to be most compressed at an intermediate position in the swing range of the handle. In the seesaw switch provided with the handle, a pressing projection protruding toward the movable contact is protruded from the handle at a portion different from the coupling portion of the reversing spring, and one end of the reversing spring and the pressing projection are inserted into the movable contact. And the handle fixes the movable contact Seesaw switch, wherein the the pressing protrusion that recesses for receiving the direction of the force which separated open movable contact from the fixed contact in contact, which are formed when swung in the direction to the point to open apart.