JPH0143794Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The present invention is a switch knob device for indirectly operating a mechanical switch such as a seesaw switch or a depth switch mounted on a printed circuit board from outside the casing. Regarding.

[Technical background of the invention]

When a mechanical switch with a movable part, such as a seesaw switch or a depth switch, is mounted directly on a printed wiring board, a switch knob that is retractably provided in the window of the casing is used to operate the switch. I'm waddling along.
The mounting structure of such a switch knob is shown in FIG.

FIG. 1 is a sectional view of a conventional switch knob structure, in which the tip of the switch knob 1 is loosely inserted into a window 3 provided in a casing 2. This switch knob 1 is plated and has a base portion 1a integrally fixed to a spring portion 4a of a metal leaf spring 4. The leaf spring 4 has a portion welded to the casing 2, and the spring portion 4a exerts a spring action on the support portion 4b, thereby applying a restoring force to the switch knob 1 pressed from the outside of the window 3. is configured to do so. Further, the base portion 1a of the switch knob 1 has a protrusion 1b, and this protrusion 1b is in contact with the movable portion 5a of the switch 5 attached to the printed wiring board 6.

According to the above, when the switch knob 1 is pressed from the outside of the casing 2, the movable part 5 of the switch 5
A is pressed by the protrusion 1b of the switch knob 1, and performs a switching function. At this time, the leaf spring 4 fixing the switch knob 1 is bent, and if the force applied to the switch knob 1 is removed, the switch knob 1 can be returned to its original state.

[Problems with background technology]

In the case of the switch knob structure having the above configuration, since the switch knob 1 is plated and the leaf spring 4 is also made of metal, there is an inconvenience that the distance between the switch knob 1 and the printed wiring board 6 according to electrical safety standards cannot be secured.
Therefore, we made the switch knob 1 made of non-conductor,
It has been devised that the leaf spring 4 is made of synthetic resin so that the movable part 5a of the switch 5 is pressed through the leaf spring 4. However, the former method has the disadvantage of not being able to match the appearance with the casing 2 and is inferior in design, while the latter method prevents the switch knob 1 from being fixed if the switch knob 1 and the leaf spring 4 become unfixed. There was an inconvenience that it could fall into the casing 2.

Furthermore, it is necessary to use as many leaf springs 4 as there are switch knobs 1, which increases the number of welded parts and makes the structure complicated.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and is a switch that satisfies electrical safety standards, satisfies the role of an insulating barrier, has a very simple structure with few welding points, and has an excellent appearance. The object of the present invention is to provide a knob device.

[Summary of the idea]

That is, in the present invention, a switch knob is loosely fitted into the window of the mounting body as a casing, and a synthetic resin plate spring is interposed between the switch knob and the movable part of the mechanical switch to perform the switching operation. This is what I did.

[Example of idea]

The present invention will be described below with reference to the illustrated embodiments.
2, 3, 4 and 5 show a switch knob device according to a first embodiment of the present invention;
The figure is a perspective view of the device of the present invention seen from the back, FIG. 3 is an exploded perspective view, FIG. 4 is a cross-sectional view taken along the line -- in FIG. 3, and FIG. 5 is a cross-sectional view for explaining the operation. The switch knob 11 is attached to the casing 12 as shown in FIG.
It is loosely fitted into the window 13 of the window 13 and is attached so that the back surface thereof is pressed by a fixing member 15 via a leaf spring 14.

That is, the switch knob 11 is a rectangular piece of material, as shown in FIG. 3, and is plated. However, plating is performed on a case-by-case basis. Opposite shaft portions 11a, 11a are protruded from the center portion in the short direction of the switch knob 11, and protrusions 11b, 11b are formed on the left and right back portions separated by the shaft portions 11a, 11a. There is. On the other hand, in the casing 12, a window frame 16 is formed in the window 13, and a mounting frame 17 is formed so as to further surround the window frame 16. This mounting frame 17 is for mounting a printed wiring board, which will be described later. Corresponding bearing holes 16a, 16a are formed in the center portion of the window frame 16 in the width direction,
The switch knob 1 is placed in each bearing hole 16a, 16a.
By inserting the shaft portions 11a, 11a, the switch knob 11 can freely rotate within the window 13 around the shaft portions 11a, 11a.

Further, the mounting frame 17 is formed with a boss 18 having a screw hole 18a, and a cylindrical portion 15a formed on the left and right opposing frames of the fixing member 15 is fitted into the boss 18. At this time,
A printed wiring board 21 with a switch 22 attached thereto is held between a mounting frame 17 and a fixing member 15 (see FIG. 2). This fixing member 15 is a frame body having two through holes, and the window 1 is connected to the central frame 15b.
Pressing parts 19, 19 are protruded in the direction 3.

On the other hand, the leaf spring 14 is formed by punching a rectangular plate made of, for example, vinyl chloride resin into a U-shape leaving the center part 14a, and the inner spring formed by this punching Part 2
0 and 20 are the protrusions 11b and 1 of the switch knob 11
1b, and the central portion 14a is supported so as to be sandwiched between the pressing portions 19, 19 and the window frame 16, as shown in FIG. In this way, the leaf spring 14 is interposed between the switch knob 11 and the fixing member 15. However, leaf spring 1
If the spring portion 20 of No. 4 is punched out so as to extend from the outer U-shaped portions 14b, 14b in addition to extending from the central portion 14a, the pressing portions 19, 19 of the fixing member 15 correspond to this. You may change the position of.

Note that the fixing member 15 may be fixed to the mounting frame 17 with screws V as shown in FIGS. 2 and 4, or
Alternatively, the cylindrical portion 15a and the boss 18 may be fixed by bonding them together.

According to the switch knob device having the above configuration, when the right half of the switch knob 11 is pressed as shown in FIG.
The spring part 20 is rotated counterclockwise around 1a to curve the spring part 20 at its protrusion 11b. As a result, the switch movable part 22 attached to the printed wiring board 21
A is moved to perform a switch operation. Furthermore, if the left half of the switch knob 11 is pressed, the spring portion 20 on the opposite side is bent to perform a switch operation. In this case, the distance between the printed wiring board 21 and the switch knob 11 is approximately 1 leaf spring.
4 is made of synthetic resin, the thickness of the switch movable part 22a becomes larger.
and the switch knob 11 are non-conductors.
4, making it a highly safe switch knob. Also, switch knob 11 and leaf spring 1
There is an advantage that two switches 22 can be operated in one set with switch 4.

6, 7 and 8 show a switch knob device according to a second embodiment of the present invention.
In these figures, members corresponding to the first embodiment are designated by the same reference numerals.

In this embodiment, the switch is operated by pushing the switch knob 11 through the window 13. That is, the switch knob 11 is a substantially square-shaped piece of material as shown in FIG.
a' and 11a' are formed. This groove 11a' corresponds to the shaft portion 11a in the previous embodiment, and is similar to the window frame 1.
The groove 11a' is fitted into the guide portions 16a', 16a' of the window frame 16 corresponding to the bearing holes 16a of No. 6, and the guides 16a', 16a' allow the switch knob 1 to
1 in the protruding and retracting direction. However, the switch knob 11 is prevented from protruding outward by a weir portion 16b formed together with a guide portion 16a' of the window frame 16. In addition, the protrusion 11 of the first embodiment is provided on the back of the switch knob 11.
A cylindrical protrusion 11b' corresponding to b is protruded, and the square synthetic resin leaf spring 1 is attached to the protrusion 11b'.
It is configured to press the spring portion 20 of No. 4. Then, the mounting frame 17 that accommodates the switch knob 11, the leaf spring 14, and the printed wiring board 21 is fitted into the fixing member 15, and by this fitting, the fixing member 1
The pressing parts 19, 19 of 5 press the opposite part of the U-shaped part 14b' of the leaf spring 14, and press the opposite part of the U-shaped part 14b' of the leaf spring 14.
When pressed, only the spring portion 20 is bent.

If you install the switch knob 11 as described above,
When the switch knob 11 is pressed, the entire switch knob is pushed backward as shown in FIG. Accordingly, the spring portion 20 is also bent rearward to actuate the switch movable portion.

Next, FIG. 9 is an exploded perspective view showing a third embodiment which is a combination of the first embodiment and the second embodiment. A feature of this embodiment is that a single leaf spring 14 can actuate a set of switches, providing a device with an extremely simple structure. In FIG. 9, the reference numerals of each member correspond to those of the previous embodiment, and a window frame 16 formed on the back side of the casing 12 partitions three windows 13, 13, 13. This window frame 16
are the bearing hole 16a and guide portion 1 of the previous embodiment, respectively.
A fixing member 15 is formed with a portion corresponding to 6a' and has a cylindrical portion 15a that fits into the boss 18.
It is now covered by Of course, at this time, the switch knobs 11, 11, 11, integrally molded synthetic resin plate spring 14, and a printed wiring board (not shown) are housed.

In this way, the present invention eliminates the trouble of welding the leaf spring 14, etc., and constructs a highly insulating switch knob device simply by sandwiching the switch knob 11 and the leaf spring 14 between the window frame 16 and the fixing member 15. It is possible to do so.

Note that if the outer U-shaped portion 14b of the leaf spring 14 is adhered to the window frame 16, the fixing member 15 becomes unnecessary. In this case, printed wiring board 21 is fixed using another fixing means. In addition, the protrusions 11b, 1 of the switch knob 11
1b' is not necessarily necessary, switch knob 1
It is also possible to directly press the spring part 20 with the main body part 1.

[Effect of idea]

As explained above, according to the present invention, the leaf spring member that applies the return force to the switch knob is made of synthetic resin, so the distance between the switch knob and the printed wiring board on which the seesaw switch, depth switch, etc. is mounted is increased. It has many advantages, such as high insulation, sufficient return force for the switch knob, excellent operability, and a simple structure without the need for welding the leaf spring member.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional switch knob device, Fig. 2 is a perspective view of the first embodiment of the present invention seen from the back, and Fig. 3 is a sectional view of the switch knob device according to the first embodiment of the present invention. 4 is a sectional view of the assembled state of FIG. 3, FIG. 5 is a sectional view of the same section as FIG. 4, explaining the operation of the present invention, and FIG. 6 is a second implementation of the present invention. FIG. 7 is an exploded perspective view showing an example; FIG. 7 is a sectional view of FIG. 6 assembled; FIG. 8 is a sectional view explaining the operation of the second embodiment; FIG. 9 is a third embodiment of the present invention. It is an exploded perspective view for explanation. 11... Switch knob, 11a... Shaft part, 1
1b... protrusion, 12... casing, 13...
Window, 15...Fixing member, 16...Window frame, 16a...
...Bearing hole, 17...Mounting frame, 18...Boss, 19
... Pressing part, 20 ... Spring part, 21 ... Printed wiring board, 22 ... Switch, 22a ... Movable part.

Claims (1)

[Scope of Claim for Utility Model Registration] A switch that is operated by pressing a movable part; A plated knob that is provided in front of the movable part of this switch and presses the movable part of the switch from outside the device housing; The device is characterized in that it is provided between the knob and the switch and consists of a plate spring made of a flat insulator whose periphery is punched out in a U-shape, and a fixing member that fixes the plate spring to the casing. Switch knob device.