JPH09259703A - Seesaw switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a support shaft from slipping out of a shaft hole at assembling time by arranging a projection on a shaft hole inner peripheral surface of a case, arranging a stopper part on the tip of the support shaft of an operation body, and regulating a movement of a projecting part in a seesaw switch. SOLUTION: In a support structure of an operation body 8 of a seesaw switch, a projecting part 10a pushed out downward so as to hide an upper end part of the opening end of a shaft hole 10 appearing in a case 1, is arranged on an inner peripheral surface of the shaft hole 10 of the case 1. A recessed place 9a into which the projecting part 10a of the corresponding shaft hole 10 is inserted by extending in the circumferential direction, is arranged on an outer peripheral surface on the base end side of a support shaft 9. A standing-up part adjacent to the recessed place 9a is formed on the tip side of the support shaft 9. This standing-up part is formed as a stopper part 9b to regulate a movement of the projecting part 10a. When the operation body 8 is pushed in the case 1 at assembling time, though side walls 1b and 1c are deflected by the sideways projecting respective support shafts 9, when the support shaft 9 reaches and is inserted into the shaft hole 10, deflection of the side walls 1b and 1c is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seesaw switch in which an operating body is rotatably supported in a case containing fixed contacts and movable contacts, and switching is performed along with the seesaw operation of the operating surface of the operating body. In particular, the present invention relates to improvement of a support structure for an operating body.

[0002]

2. Description of the Related Art This type of seesaw switch has a box-shaped bottomed case having an upper opening, a fixed contact and a central terminal which are arranged on an inner bottom portion of the case and are spaced apart from each other, and a fixed contact. A conductor plate that has a movable contact that comes into contact with and separates from the central terminal and is swingably supported; and an operating body that is supported by the case in a state in which it can rotate within a predetermined angle.
There is known a structure including a drive member that is interposed between the operating body and the conductor plate and applies an elastic force to the conductor plate. With this seesaw switch, when one end of the operation surface of the operating body is pressed, the reaction force from the drive member is transmitted to the operator's finger, but when this one end is pushed further and the operating body is rotated, the operation body is driven. The driven member rotates the conductor plate at once to perform an on operation of bringing the movable contact into contact with the fixed contact, or an off operation of separating the movable contact from the fixed contact. Therefore, this type of seesaw switch is widely used as a power switch for electric devices and electronic devices.

FIG. 6 is a perspective view showing a case and an operating body of a conventional seesaw switch, and FIG. 7 is a sectional view of an essential part showing a supporting structure of the operating body in the conventional example. The seesaw switch has an upper opening. A box-shaped case 2 having a bottom 21a
Axial holes 22 are formed in the side walls 21b and 21c facing each other.
Is opened, and each shaft hole 2 is provided on the side surface of the operating body 23.
A pair of support shafts 24 for inserting into 2 are provided in a protruding manner.
Then, at the time of assembly, the conductor plate and the drive member (not shown) are assembled, and then the operating body 23 is pushed into the case 21 through the upper opening 21a to utilize the bending of the side walls 21b and 21c to support the spindles 24. The operation body 23 assembled in the case 21 in this manner can be inserted into each shaft hole 22 within a predetermined angle with the pair of support shafts 24 pivotally supported by the side walls 21b and 21c as rotation axes. It becomes rotatable, and the operation surface 23a performs a seesaw operation in accordance with the rotation operation.

Incidentally, as shown in FIGS.
The side wall 21d connecting the side walls 21b and 21c,
On the outside of 21e, there are provided locking parts 25 for mounting, which are required when mounting the commercialized seesaw switch to a mounting plate (not shown) or the like. When mounting the product, the locking parts 25 are bent and the case is bent. 21 is press-fitted and fixed in a mounting hole such as a mounting plate. Further, the operation body 23 is formed with a tapered surface 24a at the lower portion of each support shaft 24 so as not to hinder the workability when the snap-in mounting to the case 21 is performed.

[0005]

By the way, when mounting such a seesaw switch to a mounting plate or the like, as described above, the pair of mounting locking portions 25 are bent to utilize the elastic force thereof. At this time, the case 21 has an arrow A in FIG.
Since the force indicated by is applied, the side walls 21b, 2 of the case 21
Bend 1c in the direction of arrow B in the figure (make it bulge)
The power to generate is generated. Therefore, in the conventional seesaw switch, when the side walls 21b and 21c are bent in the arrow B direction and the distance between the shaft holes 22 is slightly widened, the support shaft 24 of the operating body 23 is disengaged from the shaft hole 22. There is a risk that the seesaw switch will not function properly after installation.

It may be possible to design the support shaft 24 to have a longer projecting dimension in order to prevent it from coming off from the shaft hole 22, but in this case, workability when the operating body 23 is snap-in mounted to the case 21 is improved. It is not preferable because it is significantly deteriorated.

[0007]

According to the present invention, a protrusion is provided on the inner peripheral surface of a shaft hole of a case, and a stopper is provided on the tip end side of a support shaft of an operating body. By restricting the movement of the support shaft toward the tip side, the support shaft is prevented from coming off from the shaft hole even when a force to widen the space between the shaft holes acts on the case.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the seesaw switch of the present invention,
A case formed in a box shape having an upper opening, in which shaft holes are provided in a pair of side walls facing each other, and an attachment locking portion is provided on the outer side of another side wall connecting these side walls, and a case arranged inside the case. It has a fixed contact provided and a support shaft inserted into the shaft hole, is disposed in the upper opening, and is supported by the case via the support shaft so as to be rotatable within a predetermined angle. An operating body which is housed in the case, and a movable contact which is housed in the case and is brought into contact with and separated from the fixed contact by rotating the operating body,
In a seesaw switch in which the end of the operation surface of the operation body is pressed, a protrusion protruding radially inward is provided on the inner peripheral surface of the shaft hole, and the base end side outer peripheral surface of the support shaft is provided with the protrusion. A concave portion into which the protrusion is inserted is provided, and a standing portion on the front end side of the support shaft adjacent to the recess is used as a stopper portion that restricts the movement of the protrusion to the front end side.

In the seesaw switch configured as described above, even when a force for expanding the interval between the shaft holes is applied to the case by bending the mounting engaging portion at the time of mounting the product. Since the stopper portion provided on the tip end side of the support shaft of the operating body regulates the movement of the protrusion provided on the shaft hole to the tip end side of the support shaft, the side wall of the case having the shaft hole is bent (bulged). Therefore, there is no risk that the support shaft will come off from the shaft hole.

[0010]

Embodiments will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing an entire configuration of a seesaw switch according to an embodiment of the present invention, FIG. 2 is a sectional view of a main part showing a support structure of an operating body, and FIG. 3 is a main part showing a shape of a shaft hole of a case. 5 is a front view, FIG. 4 is a front view of a main part showing the shape of a support shaft of the operating body,
FIG. 6 is an explanatory diagram showing an engagement relationship between a support shaft and a shaft hole.

In these figures, a central terminal 2 having a support portion 2a is provided at the bottom of a case 1 formed in a box shape with a bottom.
And a contact terminal 4 having a fixed contact 3 are arranged apart from each other, and the conductor plate 5 is swingably supported on the central terminal 2 with a contact point with the support portion 2a as a swing fulcrum. ing. A movable contact 6 for contacting with and separating from the fixed contact 3 is attached to one end of the conductor plate 5, and a winding portion of a torsion coil spring 7 is provided in a space 5a of the conductor plate 5. 7a is arranged, and a pair of arm portions 7b projecting from both ends of the winding portion 7a of the torsion coil spring 7 are elastically contacted at two places across the swing fulcrum of the conductor plate 5. is there. That is, in the torsion coil spring 7, the winding portion 7a is from above from the operating body 8
It is arranged on the conductor plate 5 in a state of being pressed by. Further, a pair of support shafts 9 are provided on the side surface of the operating body 8 for substantially closing the upper opening 1a of the case 1, and these support shafts 9 should be inserted into the shaft holes 10 of the case 1. Thus, the operating body 8 is supported by the case 1 in a state of being rotatable within a predetermined angle. The case 1 is provided with shaft holes 10 in the side walls 1b and 1c facing each other, and the side wall 1 connecting the side walls 1b and 1c.
On the outer sides of d and 1e, mounting locking portions 11 required for mounting the commercial seesaw switch on a mounting plate (not shown) or the like are provided.

Next, the support structure of the operating body 8 in the present embodiment will be described in detail. On the inner peripheral surface of the shaft hole 10, the upper end portion of the opening end of the shaft hole 10 which projects into the case 1 is provided. A protrusion 10a protruding downward is provided so as to be concealed. On the other hand, a protrusion 10a of a corresponding shaft hole 10 extending in the circumferential direction is inserted into the outer peripheral surface of the support shaft 9 on the base end side. A recess 9a is provided. Therefore, a standing portion adjacent to the recess 9a is formed on the tip side of the support shaft 9,
This standing portion serves as a stopper portion 9b that restricts the movement of the protrusion 10a toward the tip side. In addition, a tapered surface 9c is formed in the lower portion of the support shaft 9 so that the operating body 8 can be easily incorporated into the case 1.

At the time of assembly, the conductor plate 5 and the torsion coil spring 7 are installed at predetermined positions in the case 1, and then the operating body 8 is pushed into the case 1 from the upper opening 1a, so that the side wall 1b, Snap-in mounting is performed in which each support shaft 9 is inserted into each shaft hole 10 by utilizing the bending of 1c. That is, when the operating body 8 is pushed into the case 1 through the upper opening 1a, the side walls 1b and 1c are bent by the support shafts 9 projecting laterally. When it reaches 10 and is inserted, the side wall 1b,
Since the flexure of 1c is eliminated, the support shaft 9 has its stopper portion 9b formed on the projection portion of the shaft hole 10 as shown in FIG. 2 by the elastic force of the torsion coil spring 7 that pushes up the operating body 8. 10a inserted behind, in other words recess 9
The protrusion 10a is held in the state of "a".
As a result, the respective support shafts 9 are pivotally supported by the side walls 1b and 1c, respectively, but the operating body 8 is only allowed to rotate within a predetermined angle with respect to the case 1, and the support shaft 9 has a concave shape. Since the location 9a is formed to be sufficiently long in the circumferential direction, as shown in FIG. 5, the protrusion 10a is always located in the recess 9a regardless of the turning operation of the operating body 8. However,
5A shows the position of the support shaft 9 in the shaft hole 10 in the switch-on state, and FIG. 5B shows the position of the support shaft 9 in the shaft hole 10 in the switch-off state.

The operating body 8 assembled in the case 1 in this way
Becomes rotatable within a predetermined angle with a pair of support shafts 9 pivotally supported by the side walls 1b and 1c as a rotation axis, and the operation surface 8a of the operation body 8 performs a seesaw operation in accordance with the rotation operation. It will be.

It should be noted that each of the support shafts 9 does not project so much from the side surface of the operating body 8, and that each support shaft 9 has a tapered surface 9 at the bottom thereof.
Since c is formed, it is not necessary to largely bend the side walls 1b and 1c when the operating body 8 is assembled to the case 1, and therefore, the operating body 8 can be relatively easily snap-in mounted.

Next, the switching operation of the seesaw switch configured as described above will be briefly described.

In this seesaw switch, for example, when one end of the operation surface 8a is pressed in the switch-off state,
Since the winding portion 7a of the torsion coil spring 7 is pushed into the operating body 8 from above and the amount of bending of the arm portion 7b increases, the arm portion 7b increases.
The elastic force (reaction force) of b is transmitted to the operator's finger. When the operating body 8 is rotated by further pushing this one end, the winding portion 7a of the torsion coil spring 7 is pushed deepest. Immediately after that, the operation of rotating all at once in the direction opposite to the operation body 8 is performed, and the conductor plate 5 is moved along with the operation of the torsion coil spring 7.
Is driven to rotate at a stroke, the movable contact 6 becomes the fixed contact 3
It contacts with and switches to the switch-on state. Similarly,
When the other end of the operation surface 8a is pushed in and the operating body 8 is rotated in the opposite direction in the switch-on state, the torsion coil spring 7 immediately rotates immediately after the winding portion 7a is pushed deepest, and the conductor is rotated. Since the plate 5 is driven to rotate, the movable contact 6 separates from the fixed contact 3 and switches to the switch-off state.

The seesaw switch described above is used by mounting it on a mounting plate or the like after the assembly is completed and commercialized. At that time, the mounting locking portions provided on the outer sides of the side walls 1d and 1e of the case 1 are used. While flexing 11, the case 1 is press-fitted and fixed in a mounting hole such as a mounting plate. Therefore, at the time of mounting the product, the elastic force of each mounting locking portion 11 tends to bend the side walls 1b and 1c into the bulging shape with respect to the case 1, in other words, the distance between the shaft holes 10. The force that tries to spread is applied. However, in this seesaw switch, the protrusion 10a of the shaft hole 10 is always located in the recess 9a of the support shaft 9 of the operating body 8, and the protrusion 10a is not supported by the support shaft 9.
Even if it tries to move to the tip side of the
b regulates this, so when mounting the product
Even if an undesired force due to the elastic force of 1 acts, the sidewall 1
b and 1c do not bend significantly, therefore
There is no concern about the accident that the support shaft 9 comes off from the shaft hole 10, and the reliability and handleability are greatly improved.

Since the present invention relates to the support shaft of the operating body and the shaft hole of the case, it goes without saying that the present invention can be applied to a seesaw switch having a switching mechanism different from that of the above embodiment.

[0020]

As described above, in the seesaw switch according to the present invention, the projection portion is provided on the inner peripheral surface of the shaft hole of the case, and the stopper portion is provided on the tip side of the support shaft of the operating body. Since it is configured so that the movement of the protrusion toward the tip side of the support shaft can be regulated, even if a force to widen the interval between the shaft holes with respect to the case acts on the case when the product is attached, There is no risk of the spindle coming off the shaft hole,
It has an excellent effect that reliability and handleability are significantly improved. Further, since it is not necessary to largely project the support shaft from the side surface of the operating body, there is no fear of impairing workability when the operating body is assembled to the case.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an overall configuration of a seesaw switch according to an embodiment.

FIG. 2 is a cross-sectional view of essential parts showing a support structure of an operating body provided in the seesaw switch of FIG.

FIG. 3 is a front view of relevant parts showing the shape of a shaft hole of a case provided in the seesaw switch of FIG. 1.

4 is a front view of relevant parts showing the shape of a support shaft of an operating body provided in the seesaw switch of FIG. 1. FIG.

FIG. 5 is an explanatory view showing an engagement relationship between the shaft hole and the support shaft shown in FIGS.

FIG. 6 is a perspective view showing a case and an operating body of a conventional seesaw switch.

FIG. 7 is a cross-sectional view of essential parts showing a support structure of an operating body provided in the seesaw switch of FIG.

[Explanation of symbols]

 1 Case 1a Upper opening 1b, 1c, 1d, 1e Side wall 2 Central terminal 3 Fixed contact 5 Conductor plate 6 Moving contact 7 Torsion coil spring 8 Operating body 8a Operating surface 9 Support shaft 9a Recess 9b Stopper part 10 Shaft hole 10a Protrusion 11 Locking part for mounting

Claims (1)

[Claims] 1. A case formed in a box shape having an upper opening, wherein a pair of side walls facing each other are provided with shaft holes, and mounting locking portions are provided on the outside of other side walls connecting these side walls, It has a fixed contact arranged in this case and a support shaft inserted in the shaft hole, and is arranged in the upper opening, and can rotate in the case within a predetermined angle through the support shaft. An operating body that is supported in such a state, and a movable contact that is housed in the case and that contacts and separates from the fixed contact by rotating the operating body, and presses the end portion of the operating surface of the operating body. A seesaw switch that is operated, wherein a protrusion that protrudes radially inward is provided on the inner peripheral surface of the shaft hole, and a recess that allows the protrusion to be inserted is provided on the outer peripheral surface on the proximal end side of the support shaft. , The upright portion on the tip side of the support shaft adjacent to this recess to the tip side Seesaw switch which is characterized in that no a stopper portion for restricting the movement of the raised portion.