JP2725209B2 - Rotary switch - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to rotary switches, such as rotary dip switches.

<Prior art and problems> In general, in this type of switch, a switch case is formed by fitting a cover 104 to a terminal base 103 to which a plurality of fixed terminal pieces 101 and a common fixed terminal piece 102 are fixed as shown in FIG.
A plurality of movable connections electrically connected to the common fixed terminal piece 102 are configured so that the rotor 106 is configured to be rotatable on the terminal base 103 so that the knob 106 a is exposed from the opening 104 a of the cover 104. The piece 107 moves the cam surface 106b in accordance with the rotation operation of the rotor 106, so that the corresponding fixed terminal piece 101
It comes to contact and separate.

By the way, in order to give moderation to the rotation operation of the rotor 106, in the conventional one, one diagonal corner portion 107a, 107b of a plate-shaped moderation spring 107 as shown in FIG. The rotor was fixed, and the other diagonally bent corners 107c and 107d were pressed against the annular uneven portion 106c of the rotor 106. However, since the moderation spring 107 has a special shape, it is difficult to make it by press molding, and the entire assembly is bent and deformed, so that the assembling operation is complicated.

The outer peripheral surface of the knob 106a of the rotor 106 and the cover 104
The O-ring 108 is fitted on the outer peripheral surface of the knob 106 in order to ensure the sealing property with the opening 104a. However, since the outer peripheral surface of the knob 106a is relatively small, this O-ring
If the position when the 108 is expanded and fitted to the knob 106a is shallow, it may come off immediately, and thus there is a drawback that the work is troublesome.

<Object of the Invention> The present invention has been made to solve the above-mentioned disadvantages of the related art, and has as its object to provide a rotary switch excellent in assembly and productivity.

<Structure and Effect of the Invention> A rotary switch according to the present invention is a switch case including a terminal base to which a plurality of stator pieces and a common fixed terminal piece are fixed, and a cover fitted to an open end of the terminal base. The rotor, the knob portion of which is exposed from the opening of the cover, is rotatably disposed in the switch case,
A plurality of movable contact pieces electrically connected to the common fixed terminal piece, wherein the plurality of movable contact pieces are brought into contact with and separated from a corresponding fixed terminal piece by movement of a cam surface accompanying rotation of the rotor. An elastic plate for sealing having a central hole press-fitted into the knob portion is fixed to the inner surface of the cover, and an open plate having a protrusion slidably contacting the annular concave and convex portion of the rotor is superposed on the inside of the elastic plate, The flat plate, the elastic plate, and the annular concavo-convex portion constitute a moderation mechanism during the rotation operation of the rotor.

According to the present invention, the seal member between the knob and the opening of the cover is formed of an elastic plate whose central hole is press-fitted into the knob of the rotor, and is fixed to the cover. There is no possibility that it will come off sometimes, and the assemblability is improved. Furthermore, since the flat plate for obtaining the moderation of the rotor is fixed to the cover by being superposed on the elastic plate, it is easier to obtain by press forming than the conventional moderation spring having a special shape. It is easy to proceed with the automation of assembly, etc.

<Description of Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

1a, 1b and 1c are a front view, a side view and a rear view, respectively, showing an example of a rotary switch according to the present invention.

In FIG. 1, reference numeral 1 denotes a first terminal base, 2 denotes a second terminal base, and both 1 and 2 are formed by joining opposing surfaces to each other. The switch case 4 is constituted by the cover 3 to be fitted. The first terminal base 1 is provided with a rotor 5 shown in FIG. 2 and its rotating shaft 6 is connected to a shaft hole 7 of the terminal base 1.
It is set to be rotatable by being fitted into. The rotor 5 has a knob 5a exposed from an opening 3a formed in the front wall of the cover 3 as shown in FIGS. 4a, 4b and 4c, and is formed around a rotation shaft 6 on the rear side. An operating groove 8 is formed on the front surface of the knob 5a.

Bosses 9A and 9B are formed on the inner surface of the cover 3 at two diagonal corners as shown in FIG.

As shown in FIG. 3, the first terminal base 1 has a first common fixed terminal piece 10 and first and second fixed terminal pieces 1.
1 and 12 are arranged in a row, and the inner ends 10a, 11a and 12a are fixed by insert molding, and a second common fixed terminal piece coupled to the first common fixed terminal piece 10. 13 inner end 13
a and each inner end 14a of the third and fourth fixed terminal pieces 14, 15;
15a (FIG. 6) is fixed. Furthermore, this first
As shown in FIGS. 2 and 3, a base end 16a of each of the terminal bases 1 has an inner end 10a of the common fixed terminal piece 10, 13.
A common contact piece 16 secured by caulking projections 17 (17A, 17B) formed on 13a and electrically connected is provided. The common contact piece 16 includes a plurality of movable contact pieces 18.
(18A, 18B, 18C, 18D) are projected, and the movable contact piece 18
A, 18B, 18C, and 18D respectively move the cam surface 5b with respect to the inner ends 11a, 12a, 14a, and 15a of the fixed terminal pieces 11, 12, 14, and 15 according to the rotation operation of the rotor 5. It is set to come and go.

The second terminal base 2 includes a second common fixed terminal piece 13 protruding from the first terminal base 1 and third and fourth fixed terminal pieces 13.
The fixed terminal pieces 14 and 15 are fixed by insert molding so as to be integrally connected at an intermediate portion thereof. Fixed terminal terminal pieces 1314, 15 connected by the second terminal base 2
Are bent at both terminal bases 1 and 2, and each of the outer end portions of the first common terminal piece 10, the first and second fixed terminal pieces 11, 12 projecting from the first terminal base 1. 10b, 11b, 12b and a second common terminal piece 1 protruding from the second terminal base 2
3, outer end portions 13b, 14 of the third and fourth fixed terminal pieces 14, 15
b and 15b are external terminal pieces that are arranged in two columns in a row and connected to the printed wiring board 19 and the like.

In FIG. 2, reference numerals 20A and 20B denote convex portions formed on the second terminal base 2 and fitted into the concave portions 21A and 21B on the first terminal base 1 side.

Numeral 22 denotes an elastic plate made of rubber or the like disposed on the inner surface of the cover 3 and having a central hole 22a which is pressed into the knob 5a of the rotor 5 as shown in FIG. Three
The bosses 9A and 9B are press-fitted into fixing holes 24A and 24B formed in the corners, respectively, and are fixed.

Reference numeral 25 denotes a flat plate formed by punching a resin or a metal plate as in this example, and is arranged inside the elastic plate 22 so as to receive elasticity. The flat plate 25 has a hole 25a through which the knob 5a of the rotor 5 is inserted,
On both sides, moderation angle-shaped protrusions 26A and 26B which are slidably contacted with the concave and convex portions 5b of the rotor 5 are formed to be bent. 27A and 27B are through holes formed at the corners of the flat plate 25 and pressed into the bosses 9A and 9B. The elastic plate 22
The flat plate 25 and the annular concavo-convex portion 5c of the rotor 5 constitute a moderating mechanism 28 when the rotor 5 is rotated.

 The procedure for manufacturing the rotary switch is as follows.

The lead frame 50 shown in FIGS. 6 and 7 is molded from a conductive plate (not shown) by press working or the like. That is,
The lead frame 50 has common fixed terminal pieces 10 and 13,
The first, second, third and fourth fixed terminal pieces 11, 12, 14, 15 are connected to the frame piece 51 via connecting pieces 52A, 52B.

The lead frame 50 is set in a molding die (not shown), and the inner ends 10a, 13a of the common fixed terminal pieces 10, 13 are connected to the
The first, second, third and fourth fixed terminal strips 11, 12, 14, 15 are molded with an insulating synthetic resin in the vicinity thereof so that the respective inner ends 11a, 12a, 14a, 15a are exposed. As shown in FIG. 8, the first terminal base 1 is formed. Furthermore, the common fixed terminal piece
13, The third and fourth fixed terminal pieces 14, 15 are similarly molded with an insulating synthetic resin to form the second terminal base 2.

Thereafter, an undesired portion of the lead frame 50 is cut and removed to obtain a block 53 as shown in FIGS. 9 and 10.
Next, the first terminal base 1 and the second terminal base 1
And the central portion 54 of the common fixed terminal strip 13, the third and fourth fixed terminal strips 14, 15 is bent around the first fixed terminal strip 14, and the first terminal as shown in FIG. The second terminal base 2 is joined to the lower surface side of the base 1. These terminal bases 1 and 2 are bound with a resin coating 55 and cover the bent portion 54 and the like.

Next, the common contact piece 16 is attached to the first terminal base 1 and the rotor 5 is assembled. Further, the mounting holes 24A, 24B of the elastic plate 22 and the mounting holes 27A, 27B of the flat plate 25 are press-fitted into the boss portions 9A, 9B of the cover 3 and fixed. Then, the cover 3 is attached to the first terminal base 1 so that the knob 5a of the rotor 5 is inserted into the center hole 25a of the flat plate 25 and the center hole 23a of the elastic plate 22.
, A rotary switch can be assembled.

In the above configuration, the operation groove 8 of the knob 5a of the rotor 5
When the rotor 5 is rotated by inserting a driver (not shown) or the like into the movable contact piece 18, the movable contact piece 18
Of A, 18B, 18C, and 18D, the one pressed by the cam surface 5b of the rotor 5 comes into contact with the corresponding one of the fixed terminal pieces 11, 12, 14, and 15, and a switch output is obtained. . By the rotation operation of the rotor 5, the contact state of the movable contact pieces 18A, 18B, 18C, 18D and the fixed terminal pieces 11, 12, 14, 15 is switched.

Since the projections 26A and 26B of the flat plate 25 receiving the elasticity of the elastic plate 22 are in pressure contact with the annular uneven portion 5c of the rotor 5, the rotor 5
At the time of the rotation operation, the protrusions 26A,
The rotation feeling of the rotor 5 can be obtained by the moderation of the 26B.

Here, the flat plate 25 superposed on the elastic plate 22 is simple in shape and can be easily molded by press molding or the like in order to obtain a moderation during the rotation operation of the rotor 5. Moreover, since the flat plate 25 receives the elasticity of the elastic plate 22, it is sufficient that the flat plate 25 itself is an ordinary metal plate. Workability is improved.

The outer peripheral surface of the knob 5a of the rotor 5 and the cover 3
The elastic plate 22 fixed to the inner surface of the cover 3 is used without using an O-ring for sealing between the opening 3a and the central hole 22a of the elastic plate 22 in a state where the elastic plate 22 is fixed to the cover 3. What is necessary is just to fit the knob part 5a, and it is free from the trouble of falling off.

FIGS. 12 and 13 show a modification of the elastic plate 22,
The O-ring portion 60 is formed integrally with the inner wall of the central hole 22a. In this case, the same effect as that of the above embodiment can be obtained, and the O-ring portion 60 can further improve the sealing performance.

[Brief description of the drawings]

FIGS. 1a, 1b and 1c are front, side and rear views, respectively, showing an example of a rotary switch according to the present invention, FIG. 2 is a cross-sectional view of the rotary switch, and FIG. Front view of the rotary switch on the terminal base side, Fig. 4a, 4b
Fig. 4 and Fig. 4c are a front view, a partially cutaway side view and a rear view, respectively, showing the structure of the rotor of the same rotary type switch.
The figure is an exploded perspective view showing the vicinity of a moderation mechanism for the rotor in the rotary switch, FIG. 6 is a plan view showing a lead frame of a fixed terminal piece of the rotary switch, and FIG. FIG. 8 is a sectional view taken along the line VII, FIG. 8 is a plan view showing a state in which a first terminal base and a second terminal base are formed on the lead frame, and FIG. 9 is a view of the lead frame shown in FIG. FIG. 10 is a plan view, FIG. 10 is a sectional view of FIG.
11 is a cross-sectional view showing a state where the second terminal base is joined to the first terminal base, FIG. 12 is a plan view showing a modification of the elastic plate, and FIG. 13 is a line XIII-XIII in FIG. FIG. 14 is a sectional view showing a conventional rotary switch, and FIG. 15 is an exploded perspective view of a main part of the rotary switch shown in FIG. 1 ... terminal base, 3 ... cover, 3a ... opening, 4 ... switch case, 5 ... rotor, 5a ... knob, 5b ...
Cam surface, 5c… Annular uneven part, 10, 13… Common fixed terminal piece, 11, 12, 14, 15… Fixed terminal piece, 18A, 18B, 18C, 18D…
Movable contact piece, 22 ... Elastic plate, 22a ... Central hole, 25 ... Flat plate, 26A, 26B ... Protrusion, 28 ... Moderation mechanism.

Continued on the front page (72) Inventor Takao Kitamura 1005 Iwashiro, Kurayoshi City, Tottori Prefecture Inside Kurayoshi Tateishi Electric Machinery Co., Ltd.

Claims (1)

(57) [Claims] 1. A switch case comprising a terminal base to which a plurality of fixed terminal pieces and a common fixed terminal piece are fixed, and a cover fitted to an opening end of the terminal base. A rotor exposed from the switch case is rotatably arranged in the switch case, and a plurality of movable contact pieces electrically connected to the common fixed terminal piece move the cam surface in accordance with the rotation operation of the rotor. Thus, in a rotary switch that comes into contact with and separates from the corresponding fixed terminal piece, an elastic sealing plate having a central hole press-fitted into the knob is fixed to the inner surface of the cover, and is slidably contacted with the annular uneven portion of the rotor. A rotary switch comprising: a flat plate having a protrusion formed on the inside of the elastic body; and a moderating mechanism at the time of rotating operation of the rotor is constituted by the flat plate, the elastic plate and the annular uneven portion.