JPH02197030A - Seesaw switch - Google Patents

Abstract

PURPOSE:To make the size of the title switch apparatus small by placing a rotating shaft of a handle and a seesaw fulcrum of a movable contactor in different positions in the direction rectangular to the center line of the handle rotating shaft. CONSTITUTION:A rotating shaft 21 of a handle 2 and a seesaw fulcrum of a movable contactor 3 are placed in different positions in the direction rectangular to the center line of the rotating shaft 21 of the handle 2 and parallel to the open surface of a main body 1 and one end of a contrarotating spring 6 is bound in the periphery of the seesaw fulcrum of the movable contactor 3. By this, spring constant of the contrarotating spring 6 can be lowered and the size of the apparatus can be made small.

Description

[Detailed description of the invention] [Industrial application field]

The present invention includes a handle that has an operation surface exposed on one surface of the main body and is pivoted on the main body so as to swing in a direction substantially perpendicular to the one surface, and contacts are opened and closed as the handle swings. It concerns a seesaw switch.

[Conventional technology]

Generally, this type of seesaw switch is equipped with a handle 2 that is swingably supported on the main body 1, as shown in FIG. A movable contactor 3 that swings in accordance with the movement is connected via a reversing spring 6 made of a coil spring. The movable contact 3 is pivotally supported by a support terminal 4 fixed at a fixed position on the main body 1 and is swingable, and a movable contact 31 is provided at the tip of the movable contact 3. Further, 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 moves into and out of contact with the fixed contact 51 as the movable contact 3 swings. That is, when the handle 2 is swung, the reversing spring 6 is compressed at the middle position of the oscillating range of the handle 2, and the movable contactor is compressed by the spring force of the reversing spring 6 on both sides of this position. 3 swings.9 The rotating shaft 21 of the handle 2 and the swinging fulcrum of the movable contact 3 are arranged on a straight line in a direction perpendicular to the top surface of the main body 1, and the reversing spring 6 is The movable contact 3 is held between a holding cylinder 23 protruding near the center of the lower surface of the handle 2 and a spring receiver 35 provided near the center of swing of the movable contact 3.

[Problem to be solved by the invention]

By the way, if the reversal spring 6 can be made long, the spring constant can be made small, and if the spring constant is small,
It is known that the contact pressure at which the movable contact 31 contacts the fixed contact 51 can be increased relative to the force required when the handle 2 is reversed; however, in order to make the reversal spring 6 longer in the above configuration, There is no choice but to increase the distance between the handle 2 and the movable contact 3, which results in the problem of increasing the overall size. The present invention aims to solve the above-mentioned problems, and provides a seesaw switch that can be made smaller while increasing the contact pressure.

[Means to solve the problem]

In order to achieve the above object, in the present invention, the rotation axis of the handle and the swing fulcrum of the movable contact are different in the direction parallel to one surface of the main body where the handle is exposed and perpendicular to the center line of the rotation axis of the handle. One end of the reversing spring is connected to the vicinity of the swinging fulcrum of the movable contact. In addition, a holding cylinder into which one end of the reversing spring is inserted is provided protruding from the handle, and the center line of the holding cylinder is aligned with the handle within a plane orthogonal to the center line of the rotation axis of the handle at the midpoint position of the swing range of the handle. It is preferable that the holding cylinder be inclined with respect to one surface of the main body where it is exposed, so that the center line of the holding cylinder and the center line of the rotation axis of the handle intersect. Further, the holding cylinder is formed into a bottomed cylindrical shape having a closed inner bottom surface against which one end of the reversal spring comes into contact with one end in the axial direction, and the inner bottom surface is on the opposite side of the opening across the center line of the rotation axis of the handle. It is best to set it in

[Effect]

According to the above configuration, the rotation axis of the handle and the swing fulcrum of the movable contact are arranged at different positions in a direction parallel to one surface of the main body where the handle is exposed and perpendicular to the center line of the rotation axis of the handle. In addition, since one end of the reversal spring is connected to the vicinity of the swing center of the movable contact, the reversal spring can be made long, and the number of turns of the reversal spring can be increased. In other words, as a result of being able to reduce the spring constant of the reversing spring, if the spring force (i.e., the force required to operate the handle) is the same when the reversing spring is at its most compressed state, and the amount of expansion and contraction of the reversing spring is the same, then , the contact pressure can be increased compared to the conventional configuration with a large spring constant. On the contrary, if the same spring as in the conventional structure is used in the structure of the present invention, the overall size can be reduced. In addition, a holding cylinder into which one end of the reversing spring is inserted is provided protruding from the handle, and the center line of the holding cylinder is aligned with the handle within a plane orthogonal to the center line of the rotation axis of the handle at the midpoint position of the swing range of the handle. If the center line of the holding cylinder is made to intersect with the center line of the rotating shaft of the handle, the reversing spring can be held diagonally, making the reversing spring even longer. Can be done. Further, the holding cylinder is formed into a bottomed cylindrical shape having a closed inner bottom surface against which one end of the reversal spring comes into contact with one end in the axial direction, and the inner bottom surface is on the opposite side of the opening across the center line of the rotation axis of the handle. If the reversing spring is provided in the reversing spring, the installation space for the reversing spring can be made even longer. Furthermore, by forming the holding cylinder in this way, the wall thickness of the handle can be made almost uniform, the generation of sink marks can be prevented, and the handle can be beautifully finished.

【Example】

Examples are shown in FIGS. 1 to 4. The main body 1 is formed of synthetic resin into a rectangular tube shape with an open top and a bottom, and a flange 11 is formed at the upper edge. Below the flange 11, spring pieces 12 are provided on both sides of book #l in the longitudinal direction, with upper and lower ends integrally connected to the main body 1, and an intermediate portion protruding away from the main body 1. Therefore, when fixing the main body 1 to a mounting panel etc., the main body 1 is inserted into the mounting hole drilled in the mounting panel etc.
is inserted, and the peripheral edge of the mounting hole is held between the flange 11 and the spring piece 12 from the front and back. The lower half of the interior of the main body 1 is separated into two chambers in the width direction of the main body 1 by a partition wall 13. 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 each in the longitudinal direction and the width direction, and 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 rotating shafts 21 integrally protruding from both sides in the width direction of the main body 1, and when the rotating shafts 21 are fitted into shaft holes 15 formed in the peripheral wall of the main body 1, the main body 1 It is pivotally supported so that it can swing vertically. The upper surface of the handle 2 is an operation surface 22, which is a curved surface with a recessed central portion. The handle 2 is formed into a cylindrical shape with an open bottom, and a holding cylinder 23 that projects downward and has an open bottom is provided inside the handle 2. Two holding cylinders 23 are provided so as to correspond to each chamber divided by the partition wall 13, and each holding cylinder 23 is perpendicular to the rotating 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 within the plane. Here,
The holding cylinder 23 is provided so that the center line l of the holding cylinder 23 intersects the center line of the rotating shaft 21. Further, the inner bottom surface of the holding cylinder 23 is formed to be located above the center line of the rotating shaft 21. A hemispherical spring receiver protrusion 24 is provided at the center of the inner bottom surface of the holding cylinder 23, and a pressing protrusion 25 is provided at the opening edge of the holding cylinder 23. One end of a reversing spring 6 made of a coil spring is inserted into each holding cylinder 23, and a protrusion 24 of the spring receiver is inserted into one end of the reversing spring 6 to prevent displacement. In addition, since the spring receiver is formed with the protrusion 24, the position of the reversing spring 6 is stabilized, so the inner bottom surface of the holding cylinder 23 can be inclined with respect to the center line l of the holding cylinder 23, and as a result, Since the handle 2 can be molded to have a substantially constant wall thickness, sink marks and the like can be prevented from occurring, and the handle 2 can be finished beautifully. The other end of the reversing spring 6 is coupled to the movable contact 3. The movable contactor 3 includes a contact holding piece 32 formed of a conductive sheet metal and having a movable contact 31 on the lower surface of one end;
A piece 33 is a substantially U-shaped spring holder that is continuous with the other end of the contact holding piece 32 and is open upward into which the other end of the inversion spring 6 is inserted.
It is equipped with The spring receiver has a locking hole 3 in the center of the piece 33.
4 is perforated. This movable contactor 3 is pivotally supported by a support terminal 4 inserted through the bottom plate of the main body 1 so as to be freely swingable. The support terminal 4 is made of a conductive sheet metal, and includes a terminal piece 41 that protrudes from the bottom surface of the main body, and a support piece 42 that is bent from the upper end of the terminal piece 41 in a direction along the inner bottom surface of the main body 1.
and locking protrusions 4 are provided on both side edges of the support piece 42, respectively.
3 is installed protrudingly. One of the two locking protrusions 43 is inserted into the locking hole 34 of the movable contact 3 to prevent displacement of the movable contact 3 with respect to the support terminal 4, and to prevent the movable contact 3 from shifting relative to the support terminal 4.
3 is inserted into the other end of the reversing spring 6, the positional displacement of the reversing spring 6 is also prevented. Moreover, the movable contact 3 contacts the edge of the side edge of the support piece 42 with respect to the support terminal 4, and swings using this edge as a fulcrum, so that the fulcrum position is stabilized. By the way, two support terminals 4 are provided and are arranged symmetrically with the partition wall 13 in between. Here, as described above, the locking protrusions 43 are provided protrudingly on both side edges of the support piece 42, so that the support terminal 4 is formed in a shape that is symmetrical across the center line, so that it can be supported on both sides. The terminals 4 have the same shape. As a result, there is only one type of support terminal 4, and an increase in the number of types of parts can be prevented. Furthermore, there is no risk of reverse assembly during assembly. A 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 fixed contact 51 facing the movable contact 31.
The contact holding piece 53 is bent from the upper end of the main body 2 in a direction along the inner bottom surface of the main body 1. Here, the fulcrum position of the movable contact 3 and the fixed contact 51 are disposed on opposite sides of a surface that is perpendicular to the opening surface of the main body 1 and includes the rotating shaft 21 . Therefore, it is possible to increase the distance from the fulcrum position of the movable contact 3 to the movable contact 31t under the constraints 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. It can be made large. Further, as described above, the movable contact 3 has a substantially U-shaped spring holder with a contact holding piece 32 protruding from the tip of one leg of the piece 33 at a substantially right angle. Compared to the case where the movable contact 3 is formed into a flat plate shape, the rotation angle of the movable contact 3 around the fulcrum can be increased, and this configuration also allows the opening distance of the movable contact 31 with respect to the fixed contact 51 to be reduced. can be made larger. Similar to the support terminals 4, the fixed contact terminals 5 are arranged symmetrically in pairs across the partition wall 13, and the refixed contact terminals 5 are formed in the same shape. Therefore, parts can be shared between a two-pole, single-throw configuration as in this embodiment and a one-pole, single-throw configuration. Further, each of the terminal pieces 41 and 52 of the support terminal 4 and the fixed contact terminal 5 are exposed in each section partitioned by the partition wall 14 and are isolated from each other. As explained above, since there are relatively few types of parts and each part can be assembled into the main body 1 from above, automatic assembly is facilitated. Next, the operation will be explained. As shown in FIG. 2(a), 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. If you press the right end of the operation surface 22 downward from this state,
The handle 2 rotates clockwise and presses the middle part of the reversing spring 6 to the left. In the middle of the swing range of the handle 2, 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, so the reversal spring 6 is compressed to be the shortest, and its When the handle 2 is rotated past this position, the spring force of the reversing spring 6 acts to bias the handle 2 clockwise. That is, the spring force of the reversing spring 6 causes the snap action. Here, since both ends of the reversal spring 6 are deviated in a direction parallel to the opening surface of the main body 1 and orthogonal to the rotating shaft 21, the length of the reversal spring 6 can be increased. The number of turns can be increased. Therefore, the spring constant of the reversing spring 6 can be reduced, and the spring force when the movable contact 31 is in contact with the fixed contact 51 is different from the spring force when the reversing spring 6 is most compressed. The difference can be reduced. As a result, the contact pressure can be increased relative to the force required to operate the handle 2. Further, in this configuration, if the reversing spring 6 is shortened, the entire device can be made smaller while still obtaining a predetermined contact pressure. The pressing protrusion 2 provided at the lower end of the handle 2 and the spring receiver provided on the movable contact 3 are inserted into the piece 33, and when the handle 2 is operated in a direction to open and separate the movable contact 31 from the fixed contact 51. In addition, when there is slight welding between the movable contact 31 and the fixed contact 51, the pressing protrusion 25 comes into contact with the inner circumferential surface of the spring holder piece 33, and the pressure is removed from the handle 2 via the reversing spring 6. By directly pressing the movable contact 3 without moving, the movable contact 31 can be forcibly separated from the fixed contact 51. When 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 movable contact 3 can be increased. In other words, it is possible to improve insulation performance and improve safety. In addition, the movable contact 3
Since a part of the handle 2 can be inserted into the handle 2, there is also the advantage that the overall height can be reduced.

【Effect of the invention】

As described above, the present invention positions the rotation axis of the handle and the swing fulcrum of the movable contact at different positions in a direction parallel to one surface of the main body where the handle is exposed and perpendicular to the center line of the rotation axis of the handle. In addition, since one end of the reversal spring is connected near the center of swing of the movable contact, the reversal spring can be made longer and the number of turns of the reversal spring can be increased. . In other words, as a result of being able to reduce the spring constant of the reversing spring, if the spring force of the reversing spring in the compressed state (i.e., the force required to operate the handle) is the same, and the amount of expansion and contraction of the reversing spring is the same, then , compared to the conventional structure having a large spring constant, has the advantage that a large contact pressure can be obtained. Conversely, if the same spring as in the conventional structure is used in the structure of the present invention, the overall size can be reduced. In addition, a holding cylinder into which one end of the reversing spring is inserted is provided protruding from the handle, and the center line of the holding cylinder is aligned with the handle within a plane orthogonal to the center line of the rotation axis of the handle at the midpoint position of the swing range of the handle. If the center line of the holding cylinder is made to intersect with the center line of the rotating shaft of the handle, the reversing spring can be held diagonally, making the reversing spring even longer. It has the advantage of being able to Further, the holding cylinder is formed into a bottomed cylindrical shape having a closed inner bottom surface against which one end of the reversal spring comes into contact with one end in the axial direction, and the inner bottom surface is on the opposite side of the opening across the center line of the rotation axis of the handle. If the reversing spring is provided in the reversing spring, the installation space for the reversing spring can be made even longer. In addition, by forming the holding cylinder in this way, the wall thickness of the handle can be made almost uniform, and there is also the advantage that the generation of sink marks can be prevented, and the handle can be finished beautifully. .

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view showing Embodiment 1 of the present invention, Figure 2 (
a) is a longitudinal cross-sectional view showing the same as the above in the on state, FIG. 2(b) is a longitudinal cross-sectional view showing the same in the off state, FIG. FIG. 5 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Main body, 2... Handle, 3... Movable contact, 4... Support terminal, 5... Fixed contact terminal, 6...
Reversing spring, 21... Rotating shaft, 22... Operation surface, 23
... Holding tube, 31... Movable contact, 51... Fixed contact. Agent Patent Attorney Ishi 1) Chief 7 Figure 3 Figure 5

Claims (3)

[Claims] (1) A handle that has an operating surface exposed on one side of the main body and is pivoted on the main body so as to swing in a direction substantially perpendicular to the one surface, and a fixed contact that is fixed at a fixed position on the main body and has a fixed contact. A movable contact including a terminal, a support terminal fixed at a fixed position on the main body, a movable contact that is pivotally supported to be swingable with respect to the support terminal and moves into and out of contact with the fixed contact as it swings; A reversing spring made of a coil spring, which is connected to the handle and whose other end is connected to the movable contact, causes the movable contact to swing as the handle swings, and is most compressed at an intermediate position in the swing range of the handle. In the seesaw switch equipped with A seesaw switch characterized in that one end of the is connected to the vicinity of a swinging fulcrum of a movable contact. (2) The handle is provided with a protruding holding cylinder into which one end of the reversing spring is inserted, and the center line of the holding cylinder is aligned in a plane orthogonal to the center line of the rotation axis of the handle at the midpoint position of the swing range of the handle. 2. The seesaw switch according to claim 1, wherein the seesaw switch is inclined with respect to the one surface of the main body, and the center line of the holding cylinder and the center line of the rotating shaft of the handle intersect. (3) The holding cylinder is formed into a bottomed cylindrical shape with a closed inner bottom surface against which one end of the reversal spring comes into contact with one end in the axial direction, and the inner bottom surface is open across the center line of the rotation axis of the handle. 3. The seesaw switch according to claim 2, wherein the seesaw switch is provided on the opposite side of the switch.