JPH058840U - Rotary witch - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an ultra-thin rotary switch capable of significantly reducing the height dimension above the chassis by omitting a housing which has been an obstacle to reduction in thickness in a conventional structure. [Structure] The fixed contact portion 11b of a holder 11 in which a slider 12 is fixedly mounted on the fixed contact portion 11b is connected to a through hole 7a of a chassis 7.
The holding body 11 was fixed to the chassis 7 in a state of being positioned inside, and the movable contact plate 13 was rotatably supported by the support shaft 8 erected on the chassis 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary switch mounted on a chassis as a rotary operation type mode switch or the like.

[0002]

[Prior Art]

 As this type of rotary switch, the one shown in the exploded perspective view of FIG. 4 has been widely known. In the figure, a rotary switch 1 comprises a casing 2 formed in a bottomed cylindrical shape with a mounting piece 2a attached thereto, and a slider having a fixed end portion 2b of the casing 2 fixedly provided with a base end portion. 3 and a movable contact plate 4 having a conductive pattern (not shown) on the surface facing the slider 3. Then, the support shaft 2c that is erected on the inner bottom surface of the housing 2 is inserted into the center hole 4a of the movable contact plate 4 to perform positioning in the height direction, so that the movable contact plate 4 is attached to the support shaft 2c. It is mounted on a shaft so as to be rotatable, and along with the rotation, the slider 3 is brought into sliding contact with the conductive pattern to switch the contacts.

Such a rotary switch 1 is commercialized by attaching a movable contact plate 4 to a housing 2 with a slider 3, and then mounted at a predetermined position on a chassis 5 and mounted on the chassis 5. It is mounted by fixing the mounting piece 2a of the housing 2 to the portion 5a.

[0004]

[Problems to be solved by the device]

 By the way, in order to reduce the thickness of this type of rotary switch, the height dimension of the housing 2 in FIG. 4 needs to be set small, but in order to secure the mechanical strength of the support shaft 2c, the bottom plate of the housing 2 is required. The part must be made thick to some extent, and the side wall part of the housing 2 has an appropriate height in order to secure a storage space for the slider 3 which stands up from the inner bottom surface. In the end, it is difficult to make the rotary switch 1 having the above-mentioned conventional structure significantly thin due to the size limitation of the housing 2, and a new structure is required to realize further thinning. ..

Therefore, it is an object of the present invention to provide an ultra-thin rotary switch capable of significantly reducing the height dimension above the chassis.

[0006]

[Means for Solving the Problems]

 The above-mentioned object of the present invention is to fix the holding body to the chassis with the fixed contact portion of the holding body having the slider fixedly mounted on the fixed contact portion in the through hole of the chassis. This is achieved by rotatably supporting the movable contact plate on a support shaft that is erected on the chassis.

[0007]

[Action]

 According to the above means, the through hole of the chassis can be used as a storage space for the slider, and since the support shaft on which the movable contact plate is mounted is erected on the chassis, it has sufficient mechanical strength. Therefore, it is not necessary to incorporate a housing that requires a size corresponding to the height of the side wall and the thickness of the bottom plate, and a significant reduction in thickness can be realized.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a rotary switch according to an embodiment of the present invention after mounting, FIG. 2 is an exploded perspective view of the rotary switch before mounting, and FIG. 3 is a plan view of a chassis on which the rotary switch is mounted. It is a figure.

The rotary switch shown in these figures includes a holder 11 having a mounting piece 11a screwed to a chassis 7 and a slider 12 fixed to a fixed contact portion 11b, and a slider 12. The movable contact plate 13 having a large number of teeth 13a on the outer peripheral surface thereof is provided with a conductive pattern (not shown) on which the slider 12 can slidably contact, and the slider 12 and a spindle 8 described later are inserted. It is mainly composed of a protective sheet 14 having a smooth surface provided between the movable contact plate 13 and the chassis 7 or the holding body 11 and having a window hole 14a for mounting on the chassis 7. Until the above, the holder 11, the movable contact plate 13, and the protective sheet 14 are temporarily fixed by the holder 15, but they are not completed as a rotary switch, and the mounting is completed. When temporary fixing is unnecessary Then, the holder 15 is removed and used as a rotary switch. That is, this rotary switch is mounted on the chassis 7 with the holding member 11, the movable contact plate 13 and the protective sheet 14 which are the components thereof being temporarily fixed by the holder 15, and the fixed contact portion of the holding member 11. 11b is positioned in the through hole 7a of the chassis 7 and the mounting piece 11a is fixed to the chassis 7 with the set screw 16, and the spindle 8 fixed in advance at a predetermined position of the chassis 7 is used as a movable contact. When the mounting is completed through the assembling work of inserting the washer 9 into the central hole 13b of the plate 13 so as to prevent it from coming off, the holder 15 is removed and the product is commercialized. Therefore, at a plurality of locations on the outer peripheral portion of the holder 15, there are provided protrusions 15a which can be engaged with and disengaged from the holder 11, and when the holder 15 is rotated in one direction, the holder 11 can be held in another direction. The holder 15 can be easily removed by turning it through, and the center of the holder 15 has a through hole for allowing the movable contact plate 13 to be pivotally attached to the support shaft 8 in a temporarily fixed state. 15b is open.

As is apparent from FIG. 2, the holding body 11 is formed in a substantially annular shape having a notch 17a for locking the locking piece 14b of the protective sheet 14 and a thin recessed step portion 17b. The frame 17 and the base 18 which is formed by inserting the base end portion of the slider 12 and is formed and mounted in the recessed step portion 17b can be distinguished from each other, but the boss 17c of the frame 17 is preliminarily caulked with the base 18. The frame 17 and the base 18 are handled as an integrated product by inserting them into the holes 18a and caulking them, and the concave step portion 17b and the base 18 serve as the fixed contact portions 11b of the holding body 11. Similarly, the movable contact plate 13 can also be divided into a board 19 having a conductive pattern on one surface and a gear 20 having a large number of teeth 13a. The boss 19a of the board 19 is previously inserted into the caulking hole 20a of the gear 20. Then, by caulking, the board 19 and the gear 20 are handled as an integrated product. Further, as the protective sheet 14 having a smooth surface, 6-6 nylon is used in this embodiment.

The rotary switch constructed as described above and mounted on the chassis 7 engages a drive member (not shown) with the teeth 13a of the movable contact plate 13 rotatably supported by the support shaft 8. By rotating the movable contact plate 13 via this driving member, the relative position between the conductive pattern and the slider 12 changes, so that the contacts are switched, and a plurality of types can be selected according to the rotational position of the movable contact plate 13. The mode can be used as a selectable mode switch.

As described above, in the above-described embodiment, since the fixed contact portion 11b of the holder 11 is located in the through hole 7a of the chassis 7, the through hole 7a is used as a storage space for the slider 12. In addition, since the support shaft 8 for rotatably mounting the movable contact plate 13 is fixed to the chassis 7, sufficient mechanical strength can be expected for the support shaft 8, which is an obstacle to thinning. A structure that does not require a housing, that is, a structure that does not require a housing that requires appropriate dimensions for the height of the side wall and the thickness of the bottom plate in order to secure the mechanical strength of the slider storage space and spindle. It has been realized, and as a result, an ultra-thin rotary switch, which has been considered difficult in the past, has been obtained.

Further, in the above-described embodiment, the protective sheet 14 having a smooth surface is interposed between the chassis 7 and the holding body 11 and the conductive pattern of the movable contact plate 13, and the conductive pattern is protected by the protective sheet. Since there is no risk of increasing the frictional resistance or damaging the conductive pattern even when it is slidably contacted with 14, the height of the rotary switch on the chassis 7 can be made almost equal to the thickness of the movable contact plate 13. Therefore, the amount of protrusion on the chassis 7 is extremely small, and the rotary switch has a good space factor. Moreover, if the holder 11, the movable contact plate 13, and the protective sheet 14 are temporarily fixed in advance by the holder 15, the conductive pattern of the movable contact plate 13 is handled while being covered by the protective sheet 14. Therefore, it is unlikely that dust adheres to the conductive pattern, and therefore it is possible to prevent conduction failure after mounting due to the presence of dust.

Furthermore, if the housing is omitted and the thickness is reduced, it is not possible to commercialize it before mounting, and there is a possibility of some disadvantage in handling and assembling. Since the holding body 11, the movable contact plate 13 and the protective sheet 14 are temporarily fixed by using them and can be mounted on the chassis 7 in this temporarily fixed state, they can be easily transported and stored before mounting. It is also easy to assemble during mounting. Then, when the holder 15 is attached, if the relative position in the circumferential direction between the slider 12 and the conductive pattern of the movable contact plate 13 is determined and temporarily fixed, it is necessary to set the initial mode position again after mounting. Is eliminated, the workability in the assembly line is improved accordingly.

Although the support shaft 8 is fixed to the chassis 7 by caulking or the like in the above embodiment, a part of the chassis 7 may be projected to form the support shaft 8. Alternatively, the slider 12 may be directly fixed to a part of the frame 17, or a part of the base 18 may be directly fixed to the chassis 7.

If the height position of the movable contact plate 13 is set so that a predetermined clearance can be secured between the conductive pattern of the movable contact plate 13 and the chassis 7, the protective sheet 14 can be omitted. It is also possible to do so.

Furthermore, if the work of assembling the holding body 11 and the movable contact plate 13 with respect to the chassis 7 can be automated, the holder 15 for temporary fixing can be omitted.

It goes without saying that the present invention can be applied to rotary switches other than mode switches.

[0020]

[Effect of the device]

 As described above, according to the present invention, the through hole of the chassis can be used as a storage space for the slider, and the supporting shaft on which the movable contact plate is mounted is erected on the chassis. It is possible to provide a mechanically strong, ultra-thin rotary switch that has an extremely small height on the chassis, because it is possible to omit the housing that was an obstacle to thinning in the conventional structure. ..

[Brief description of drawings]

FIG. 1 is a cross-sectional view after mounting a rotary switch according to an exemplary embodiment of the present invention.

FIG. 2 is an exploded perspective view of the rotary switch shown in FIG. 1 before mounting.

FIG. 3 is a plan view of a chassis for mounting the rotary switch shown in FIG.

FIG. 4 is an exploded perspective view of a rotary switch according to a conventional example.

[Explanation of symbols]

 7 Chassis 7a Through Hole 8 Spindle 11 Holder 11a Mounting Piece 11b Fixed Contact Part 12 Slider 13 Moving Contact Plate

Claims (1)

[Claims for utility model registration] [Claim 1] A holding body having a slider fixed to a fixed contact portion, and a conductive pattern capable of sliding contact with the slider on a surface facing the slider. And a movable contact plate, which is used by being fixed to a chassis, and fixing the holding body to the chassis with the fixed contact portion of the holding body positioned in the through hole of the chassis. At the same time, a rotary switch characterized in that the movable contact plate is rotatably supported by a support shaft erected on the chassis.