JPH11329153A - Rotary switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary switch having a simple structure and capable of more reliably preventing a switch operating part from being pulled out. SOLUTION: A pair of arc-shaped guide hole parts 11, 14 are provided on a switch body 2 side, and a pair of extended sections 60, 60 having stopper parts 61, 61 protuberantly formed at their tip parts respectively are provided on a switch operating part 50 side. The switch operating part 50 is rotatably attached to the switch body part 2 with the stopper parts engaged, by inserting each extended section 60, 60 through each arc-shaped hole part 11, 14 and engaging the stopper parts 61, 61 with the peripheral rim part of each arc-shaped guide hole part 11, 14 respectively. A recessed relief parts 13, 16 to let the stopper parts 61, 61 on the tip parts of the extended sections 60, 60 escape to a position where they do not interfere with the peripheral rim part of the arc-shaped guide hole parts 11, 14 when they are inserted through the arc-shaped hole parts 11, 14, are formed at the locations other than both end parts of each arc-shaped guide hole part 11, 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary switch used for general electric equipment and the like.

[0002]

2. Description of the Related Art Conventionally, as a rotary switch of this kind,
There is a configuration as shown in FIGS.

[0003] This rotary switch comprises a switch body 1
00 and a switch operation unit 110.

The switch operating section 110 is formed in a circular shape with an open lower surface, and has a shaft 112 extending downward from the inside of the upper surface thereof. The switch body 100 is formed in a substantially circular flat plate shape, and a hole 102 through which the shaft portion 112 can be inserted is formed at a substantially central portion thereof. By inserting the shaft 112 from above the hole 102 and attaching a retaining ring 118 to the tip of the shaft 112 protruding below the hole 102, the switch operation unit 110 is connected to the switch body 100. It is mounted so that it can be prevented from coming off and can be rotated freely.

In this switch, a predetermined contact circuit is provided in the switch main body 100 and the switch operation section 110. When the switch operation section 110 is turned to the ON position, both contacts are closed, and the switch operation section 110 is closed. OF
When rotated to the F position, both contacts open.

[0006]

However, FIG.
In the rotary switch shown in FIG. 14 and FIG.
The switch body 100 has a complicated configuration in which a retaining ring 118, which is a separate component from the switch operation unit 110, is attached to prevent the switch main body 100 from being removed. Therefore, the number of parts is large and the assembly is also complicated. There was a problem.

Therefore, as a rotary switch having a simple configuration, a rotary switch having a configuration as shown in FIGS. 15 and 16 has been proposed.

In this rotary switch, a pair of extending pieces 132 are formed in the switch operating section 130, and arc-shaped guide holes 122 respectively corresponding to the extending pieces 132 are formed in the switch main body 120. I have. Also,
A retaining portion 134 is formed at the distal end of each of the extending pieces 132 so as to protrude toward the outer peripheral side thereof, and the escape recess 12 is formed at an inner peripheral edge at one end of each of the arc-shaped guide holes 122.
4 is notched.

[0009] Each of the extending pieces 132 is inserted into each of the arc-shaped guide holes 122 while bending and deforming the extending pieces 132 so that their distal ends escape into the respective escape recesses 124. By elastically restoring, the retaining portions 134 at the distal ends of the extending pieces 132 are slidably engaged with the outer peripheral edges of the arc-shaped guide holes 122, respectively.

In this manner, the switch operating section 130 rotates the switch main body 120 between the ON position and the OFF position where the extending pieces 132 abut on both ends of the arc-shaped guide holes 122. It can be mounted freely. At this time, since each retaining portion 134 is slidably engaged with the outer peripheral portion of each arc-shaped guide hole 122, the switch operating portion 130 is prevented from being removed from the switch main body 120.

In such a rotary switch, the switch operating section 130 can be mounted on the switch main body 120 without requiring any other components. There are no problems found with switches.

However, in the above rotary switch, since the escape recess 124 is formed at one end of the arc-shaped guide hole 122, the switch operating section 130 is turned on (or turned off).
When the switch operation unit 130 is located at the FF position, there is a problem that the switch operation unit 130 is easily detached from the switch main body unit 120.

This is for the following reason. That is, when the switch operating unit 130 is in the ON position (or OFF position), each extension piece 132 is disposed at a position where the escape recess 124 is formed at one end of each arc-shaped guide hole 122. I have. Then, in this state, when a detaching force is applied to the switch operation unit 130 in the upward direction, each extension piece 132 is bent and deformed to the inside, that is, to the escape recess 124 side,
This is because the engagement between the retaining portion 134 and the outer peripheral edge of the arc-shaped guide hole 122 is easily released.

Such a problem tends to occur particularly when the elastic force of the extension piece 132 is reduced at a high temperature.

The present invention has been made in order to solve the above-mentioned problems, and provides a rotary switch having a simple configuration and capable of more reliably preventing the switch operating section from coming off. The purpose is to do.

[0016]

According to a first aspect of the present invention, there is provided a rotary switch in which a pair of arcuate guide holes are formed at respective positions opposed to each other with a predetermined rotary shaft interposed therebetween. And a pair of extending pieces corresponding to the pair of arc-shaped guide holes are vertically suspended from the peripheral portion, and a retaining portion is formed at the tip of each extending piece. A switch operating portion, wherein each of the extension pieces is inserted into a corresponding one of the arc-shaped guide holes, and their retaining portions are slidably slidable in the peripheral portion of each of the arc-shaped guide holes. The switch operating portion is rotatably mounted on the switch body between the positions where the extending pieces abut on both ends of the arc-shaped guide holes, respectively, by being engaged with Extend the extension piece into each of the arc-shaped guide holes. Escape recesses for releasing the retaining portions at their distal ends to the non-interfering positions with the peripheral edge portions of the arc-shaped guide holes when they are respectively inserted are peripheral edges of the arc-shaped guide holes, and both ends thereof Each portion is formed at an intermediate position excluding the portion.

According to a second aspect of the present invention, the retaining portion of each of the extending pieces is formed so as to protrude toward one of the outer peripheral edge and the inner peripheral edge of each of the arc-shaped guide holes. On the other hand, the escape concave portion of each of the arc-shaped guide holes may be recessed on the inner peripheral edge portion or the outer peripheral edge side opposite to the direction in which the respective retaining portions project.

Furthermore, a tapered surface which is inclined upward in the projecting direction of the retaining portion is formed on the lower surface side of each retaining portion, and each of the extension pieces corresponds to the third retaining portion. When each of the arc-shaped guide holes is inserted, the respective tapered surface is brought into contact with the peripheral edge of each of the arc-shaped guide holes, so that each of the extended pieces is bent so as to escape into the escape recess. At the position where the respective tapered surfaces cross over the peripheral edge of the respective arc-shaped guide holes, the respective extended pieces are returned to their original shapes, and the respective retaining portions are replaced with the respective peripheral portions of the respective arc-shaped guide holes. May be engaged.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary switch according to an embodiment of the present invention will be described below.

The rotary switch is interposed, for example, in a grounding circuit for stopping the operation of the generator motor in a magnet ignition device of the generator motor, by grounding the primary circuit to ground. It is used.

In each of the following descriptions, ON, OF
F means the operation and stop of the generator motor, so that when the switch is in the ON state, the internal contacts are opened, and when the switch is in the OFF state, the internal contacts are closed.

As shown in FIGS. 1 to 4, the rotary switch has a switch main body 2 having a substantially disc-shaped circular base 10 and a flange 4 extending to one side in front of the base. And a circular switch operation unit 50 having an opening.

The switch operating section 50 is rotatably mounted on the switch main body 2 about a predetermined rotation axis Y extending vertically.

That is, the switch body 2 is provided with
As shown in FIG. 8, a pair of arc-shaped guide holes 11 and 14 are formed on the front and rear peripheral edges of the circular base 10 so as to face each other. Each of the arc-shaped guide holes 11 and 14 is formed in an arc shape having a predetermined length with the predetermined rotation axis Y as a center of curvature.

On the other hand, the switch operating section 50 is
As shown in FIG. 1, a pair of extending pieces 60, 60 are formed corresponding to the arc-shaped guide holes 11, 14, respectively, from the front and rear regions of the lower peripheral edge of the opening.

The extension pieces 60, 60 are inserted into the corresponding arc-shaped guide holes 11, 14 from above, respectively, so that the extension pieces 60, 60 are respectively connected to the arc-shaped guide holes 11, 14. , 14 are slidably guided. Thus, between the ON position A and the OFF position B where the extension pieces 60, 60 abut on both ends of the arc-shaped guide holes 11, 14, respectively (see FIG. 1), the switch operation unit 50 is connected to the switch body 2. It will be supported rotatably.

Also, at the lower end of each extension piece 60, 60,
The retaining portions 61 are formed so as to protrude toward the outer peripheral side. Tapered surfaces 62, 62 inclined upward toward the outer peripheral side are formed on the lower surface side of the retaining portions 61, 61, and the sliding contact step portions 63, 62 are formed on the base end side of the upper surface.
63 is formed (see FIG. 10).

On the other hand, the circular base 10 on the switch body 2 side
A protruding ridge 12 is formed on the outer peripheral side along the front arcuate guide hole 11 so as to protrude downward, and a lower portion of the outer peripheral wall is formed in the rear arcuate guide hole 14. A notch groove portion 15 is formed along (see FIG. 8).

Each extension piece 60, 60 is connected to each arc-shaped guide hole 1
In the state of being inserted through the first and the second stoppers 14,
The sliding contact steps 63, 63 of the projection 61 have the lower surface 12a of the ridge 12 of the arc-shaped guide holes 11, 14 and the notch groove 15, respectively.
Is slidably engaged with the bottom surface 15a of the switch body 2 so as to prevent the switch operation unit 50 from being removed from the switch body 2.

The position excluding both ends of the arc-shaped guide holes 11, 14 is a position slightly shifted clockwise from the left-hand end of each of the arc-shaped guide holes 11, 14 in FIGS. Escape recesses 13 and 16 are formed in each of the inner peripheral portions by cutting out over a predetermined length. In addition, on the inner peripheral side of the arc-shaped guide hole 11 on the upper surface of the circular base 10,
As will be described later, an enclosing wall 20 is formed along the circumferential direction, and the escape recess 13 on the front side is also formed continuously on the outer peripheral surface side of the enclosing wall 20.

Further, tapered guide grooves 11a and 14a are formed on the upper side of the outer peripheral wall surfaces of the arc-shaped guide holes 11 and 14 at positions opposed to the escape recesses 13 and 16, respectively. 5 and FIG. 8). Each of the tapered guide grooves 11a and 14a is formed to have substantially the same width dimension as each of the recessed recesses 13 and 16, and the lower part thereof is finished as a tapered surface inclined inward downward.

When the extending pieces 60, 60 are inserted into the arc-shaped guide holes 11, 14, respectively, the respective tapered surfaces 62, 62 are formed in the tapered guide grooves 11a, 14a.
The extension pieces 60, 60 are inserted into the arc-shaped guide holes 11, 14 in such a manner as to be pressed against a. Then, the respective tapered surfaces 62, 62 and the tapered guide groove portions 11a, 14a
, The extension pieces 60, 60 are bent inward so as to escape into the escape recesses 13, 16, respectively. Further, when the extension pieces 60, 60 are inserted downward while being guided by the taper guide grooves 11a, 14a, respectively, the respective tapered surfaces 62 extend over the outer peripheral wall surfaces of the arc-shaped guide holes 11, 14, respectively. The pieces 60, 60 are elastically restored, whereby the sliding contact step portions 6 of the retaining portions 61, 61 are formed.
Reference numerals 3 and 63 denote lower corner portions of the peripheral edge portions of the arc-shaped guide holes 11 and 14, that is, the lower surface 12 a of the ridge 12 of the arc-shaped guide holes 11 and 14 and the bottom surface 15 a of the notch groove 15.
, The switch operation unit 50 is attached to the switch body 2 in a retaining shape.

As described above, when the switch operating unit 50 is attached to the switch body 2, each of the extension pieces 60, 6
0 is rotatable between positions where it contacts the opposite ends of the arc-shaped guide holes 11 and 14, respectively. In addition, each extension piece 6
In a state where the reference numerals 0 and 60 are in contact with the clockwise ends of the respective arc-shaped guide holes 11 and 14 (see FIG. 3), the switch operation unit 50 is provided.
Is an ON position A, and an indicator 53 at the front of a knob 52 formed on the outer peripheral surface of the switch operating portion 50 from the front side to the rear side is marked “ON” on the right side of the upper surface of the collar portion 4. The display 5 is indicated (see FIG. 1). on the other hand,
When the extending pieces 60, 60 are in contact with the counterclockwise ends of the arc-shaped guide holes 11, 14, the switch operating unit 50 is in the OFF position B, and the indicating unit 53 of the switch operating unit 50 is in the OFF position B. An “OFF” display 5 written on the left side of the upper surface of the collar portion 4 is indicated (see FIG. 1).

An arc-shaped guide groove 29 is formed along the circumferential direction at a portion from the arc-shaped guide hole 11 to the arc-shaped guide hole 14 on the right peripheral edge of the circular base 10 of the switch body 2. At the same time (see FIG. 5), an arc-shaped guide ridge 59 movable in the arc-shaped guide groove 29 is formed at the lower opening peripheral edge of the switch operation unit 50 (see FIG. 11). When the switch operating unit 50 is attached to the switch main body 2, the arc-shaped guide ridges 59 move in the guide grooves 29.
The rotation operation of the switch operation unit 50 is guided.

On the inner peripheral side of each of the arc-shaped guide holes 11 and 14 on the upper surface of the circular base 10 of the switch main body 2, an enclosing wall 20 surrounding a contact structure described later is substantially entirely formed along the circumferential direction. It is formed over the circumference.

The rear side of the surrounding wall 20 is formed in a concave wall portion 21 which is recessed inward (see FIG. 5). On the front side of the intermediate portion of the concave wall portion 21, a concave groove portion 2 is formed along the vertical direction.
3 and a main body side protruding part 24 having a triangular horizontal cross section is formed from the upper end side to the lower end part of the concave groove part 23.

On the outer peripheral side of the concave wall portion 21, the concave wall portion 21 is provided.
An elastic piece 25 that can be flexibly deformed is formed so as to extend between both ends of the elastic member. The central portion of the elastic piece 25 has a main-body-side protruding portion 26 protruding outward (outward) in a U-shape.
Formed. The main-body-side protruding portion 26 is finished in a shape that is larger and gentler than the protruding shape of the main-body-side protruding portion 24.

On the other hand, the rear end portion of the peripheral wall portion 55 of the switch operation portion 50 is formed to be partially thick, and the sliding contact flat portion 7 is formed here.
5 are formed (see FIGS. 4 and 11). At a substantially central portion of the sliding contact flat portion 75, a gentle and large mountain-shaped operation portion side projecting portion 76 is formed.

When the switch operating section 50 attached to the switch main body 2 is rotated, as shown in FIG. 12, the main body side projecting portion 26 is moved to the operation portion side projecting portion 76.
The switch operation unit 50 is urged to rotate to the ON position A side or the OFF position B side.

That is, when the switch operating section 50 is at the ON position A, the operating section side protruding section 76 is at the position shown by the dashed line in FIG. Further, when the switch operation unit 50 is
When in the F position B, the operation unit side protrusion 76 is
It is at the position indicated by the broken line 2. And the switch operation unit 5
When 0 is between the ON position A and the center position between the ON position A and the OFF position B, the main body side protruding portion 26 rides on the operation portion side protruding portion 76 and the elastic piece 25 is elastically moved inwardly. The switch operation unit 50 is deformed and is urged to rotate toward the ON position A by the elastic return force. On the other hand, when the switch operation unit 50 is between the ON position A and the OFF position B and the OFF position B, the elasticity caused by the main body side protruding portion 26 riding on the operation portion side protruding portion 76 is reversed. Upon receiving the elastic restoring force of the piece 25, the switch operation unit 50 is rotationally biased to the OFF position B side.

For example, when the switch operation unit 50 is turned to the ON position A
When switching from the ON position A to the OFF position B, first, the switch operation unit 50 is rotated from the ON position A to an intermediate position between the ON position A and the OFF position B against the urging force of the elastic piece 25. When the main body-side protruding portion 26 gets over the operation portion-side protruding portion 76, the switch operation portion 50
The switch operation unit 50 is rotated to the OFF position B in this state by being urged to rotate to the OFF position B side by receiving the elastic force of 5. Note that the switch operation unit 50 is
When switching from the F position B to the ON position A, the operation is the reverse of the above operation.

Further, inside the switch operating section 50, a sliding contact extending piece 70 is vertically provided downward at a position slightly deviated rearward from the rotation axis Y (see FIG. 11). An operation portion-side protrusion 72 slidably in contact with the main body-side protrusion 24 is formed at a substantially central position on the rear surface of the piece 70 along the vertical direction.

The operation portion side protrusion 72 is in sliding contact with the main body side protrusion 24 when the switch operation portion 50 is located substantially at an intermediate position between the ON position A and the OFF position B. So, for example,
When switching the switch operation unit 50 from the ON position A to the OFF position B, the switch operation unit 50
In the middle of the FF position B, when the operation section side protruding section 72 gets over the main body section side protruding section 24, a large rotational operation force is required, and the switch operation section 50 is turned to the OFF position B
When switching to the ON position A, a clear click feeling is obtained.

A pair of contact portions 40 and 45 are provided facing each other in the surrounding wall 20 of the switch body 2 (see FIG. 5), and a switching contact portion 80 is provided inside the switch operation portion 50. (See FIG. 11).

The contact portion 40 is disposed on one left side of the inner peripheral surface of the enclosing wall 20, and a contact piece 41 extending downward penetrates the circular base 10 in the enclosing wall 20 to form the circular base 10. A peripheral mounting portion 30 described below provided at the lower portion (see FIG. 7)
Are arranged along the outer peripheral surface of the.

The contact portion 45 is disposed on one side on the right side of the inner peripheral surface of the surrounding wall 20 and is electrically and mechanically connected to one end of the lead wire 90 inside the surrounding wall 20 (see FIG. 4). 5). The lead wire 90 is drawn out through an outlet 27 formed by cutting out one side of the right side of the surrounding wall 20. A connection terminal 9 for connection to an external device is connected to the other end of the lead wire 90 thus drawn out.
1 is attached (see FIGS. 2 and 3).

A waterproof rubber plug 92 is attached to a portion where the connection terminal 91 and the lead wire 90 are attached.

On the other hand, the switching contact portion 80 is formed in a substantially arc shape by a metal spring material or the like, and both ends of the switching contact portion 80 are bent inward to be able to elastically contact the contact portions 40 and 45.
1, 81 (see FIG. 11). The switching contact portion 80 is mounted in the switch operation portion 50 such that an intermediate portion thereof is sandwiched between a pair of mounting members 83 and 84 formed at a front portion in the switch operation portion 50.

When the switch operating section 50 is mounted on the switch main body 2, the contacts 8 at both ends of the switching contact section 80 are provided.
1 and 81 are configured to elastically contact the inner peripheral surface of the surrounding wall 20. When the switch operation unit 50 is located at the OFF position B, as shown by the broken line in FIG. 12, the two contacts 81 are resiliently contacted with the contact portions 40 and 45, respectively. Thus, conduction between the two contact portions 40 and 45 is obtained. When the switch operation unit 50 is rotated to the ON position A, as shown by a dashed line in FIG.
The switching contact part 80 rotates clockwise, and the two contacts 8
1, 81 are moved to the non-contact positions with the respective contact portions 40, 45, whereby the conduction between the two contact portions 40, 45 is cut off.

The lower end of the circular base 10 of the switch body 2 has a circumferential mounting portion 30 formed in a substantially circular wall shape.
Is formed (see FIG. 7). The peripheral mounting portion 30 is for mounting on a device in which the switch is used, and has a mounting piece 3 having an engaging portion 31 on the front end side in the front and rear regions.
2 protrudes downward.

When the rotary switch is mounted on a predetermined device, the peripheral mounting portion 30 is fitted into a mounting hole formed in the device, and an engaging portion of the mounting piece 32 is fitted on the mounting hole side. It is configured such that the attachment is performed by engaging the base 31.

According to the rotary switch configured as described above, the pair of extension pieces 60, 6 on the switch operation unit 50 side are provided.
0 is a pair of arc-shaped guide holes 11 on the switch body 2 side,
14, respectively, and the retaining portions 61, 61
Are slidably engaged with the peripheral edges of the arc-shaped guide holes 11 and 14, respectively, so that the switch operating portion 50 is rotatably operably attached to the switch main body 2 in a retaining shape. As shown in FIG.
Other components such as 18 are unnecessary, and the configuration is simple.

In the conventional example shown in FIGS. 15 and 16, when the switch operating portion 130 is in the ON position or the OFF position, the retaining portion 134 of each extension piece 132 escapes into the escape recesses 124. There is a possibility that the engagement between the retaining portion 134 and the arc-shaped guide hole peripheral portion 122 may be released due to the bending deformation, but in this rotary switch, the escape recesses 13 and 16 are formed in the arc-shaped guide hole portion 11. , 14 are formed at positions except for both ends, so that even when the switch operation unit 50 is in the ON position A or the OFF position B, the switch operation unit 50 is difficult to be removed from the switch main body 2 and the switch An effect is obtained that the operation section can be more reliably prevented from coming off.

Further, the tapered surfaces 62, 62 formed at the distal end of each retaining portion 61 are formed with tapered guide grooves 11a, 14a.
a, the extension pieces 60, 60 are inserted into the arc-shaped guide holes 11, 14, and the respective tapered surfaces 62, 62 contact the tapered guide grooves 11a, 14a at this time. The extension pieces 60, 60 are respectively
16 so as to be deflected inward so as to escape into the inner surface 16.
The extended pieces 60, 60 return elastically at positions where they have passed over the outer peripheral wall surfaces of the arc-shaped guide holes 11, 14, whereby the sliding contact step portions 63, 63 of the retaining portions 61, 61 respectively have the arc-shaped guides. The switch operation unit 50 can be attached to the switch body 2 in a retaining manner by being engaged with the lower surface 12a of the ridge 12 of the holes 11 and 14 and the bottom surface 15a of the notch groove 15. It can be done easily.

[0055]

As described above, claims 1 to 3 of the present invention.
According to the rotary switch described above, each extending piece is inserted into each arc-shaped guide hole, and their retaining portions are slidably engaged with the periphery of each arc-shaped guide hole in a retaining shape. With this configuration, the switch operating portion is rotatably mounted on the switch main body between the positions where the extending pieces abut on both ends of the arc-shaped guide holes, respectively.
Other components such as a conventional retaining ring are not required, and the configuration is simple. In addition, when each extension piece is inserted into each arc-shaped guide hole, an escape recess for releasing the retaining portion at the tip thereof to a position where it does not interfere with the peripheral edge of each arc-shaped guide hole is formed in each arc-shaped. In the case where the switch operation portion is located at a position where the respective extension pieces are in contact with both end portions of each arc-shaped guide portion since the switch operation portion is formed at an intermediate position excluding both end portions thereof at the peripheral portion of the guide hole portion. In addition, each extension piece is bent and deformed so as to escape to each escape concave portion, so that the engagement between the retaining portion and the peripheral edge portion of the arc-shaped guide hole becomes difficult to release, and the switch operation portion is securely prevented from coming off here. The effect that it can be obtained is obtained.

Further, a tapered surface which is upwardly inclined toward the projecting direction of the retaining portion is formed on the lower surface side of each retaining portion, and each extending piece is formed in each arc-shaped guide hole. By inserting each tapered surface into contact with the peripheral edge of each arc-shaped guide hole when each is inserted into the portion, each of the extended pieces is flexibly deformed so as to escape into the escape recess, and each tapered surface is bent. When each extension piece is returned to its original shape at a position over the peripheral edge of each arc-shaped guide hole, and each retaining portion is engaged with the peripheral edge of each arc-shaped guide hole in a retaining shape, By pushing the distal end of the extension piece into contact with the peripheral edge of each arc-shaped guide hole, the switch operating part is attached to the switch main body, so that their assembly is facilitated.

[Brief description of the drawings]

FIG. 1 is a plan view showing a rotary switch according to an embodiment of the present invention.

FIG. 2 is a side view showing the rotary switch according to the first embodiment;

FIG. 3 is a bottom view showing the rotary switch according to the first embodiment;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is a plan view showing a switch body.

FIG. 6 is a side view showing a switch body.

FIG. 7 is a bottom view showing the switch body.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 5;

FIG. 9 is a plan view showing a switch operation unit.

FIG. 10 is a side view showing a switch operation unit.

FIG. 11 is a bottom view showing a switch operation unit.

FIG. 12 is a plan view for explaining an operation state when the switch operation unit rotates.

FIG. 13 is a plan view showing a conventional rotary switch.

FIG. 14 is a sectional view taken along line XIV-XIV of FIG.

FIG. 15 is a cross-sectional view showing another conventional rotary switch.

FIG. 16 is a bottom view showing the rotary switch of the above.

[Explanation of symbols]

 2 Switch body 11, 14 Arc-shaped guide hole 13, 16 Escape recess 50 Switch operating part 60 Extended piece 61 Retaining part

Claims (3)

[Claims] 1. A switch body having a pair of arcuate guide holes formed at respective positions opposed to each other with a predetermined rotation axis interposed therebetween, and a pair of extending pieces corresponding to the pair of arcuate guide holes from a peripheral edge. And a switch operation part having a retaining portion protrudingly formed at the tip of each of the extending pieces, and each of the extending pieces is inserted into the corresponding one of the arc-shaped guide holes. By making the retaining portions slidably engage with the peripheral edges of the arc-shaped guide holes, respectively, the extended pieces contact the opposite ends of the arc-shaped guide holes, respectively. Between the contact positions, the switch operating portion is rotatably attached to the switch main body portion, and when inserting each of the extension pieces into each of the arc-shaped guide holes, a retaining portion at a tip end thereof is used. With the peripheral edge of each arc-shaped guide hole Escape recess to escape to non-interference position
A rotary switch formed at a peripheral edge of each of the arc-shaped guide holes and at an intermediate position excluding both ends thereof. 2. The retaining portion of each of the extension pieces is formed so as to protrude toward one of an outer peripheral edge and an inner peripheral edge of each of the arc-shaped guide holes. 2. The rotary switch according to claim 1, wherein the escape recesses are formed on the inner peripheral side or the outer peripheral side opposite to the direction in which the retaining portions protrude. 3. A tapered surface which is upwardly inclined toward a projecting direction of the retaining portion is formed on a lower surface side of each of the retaining portions, and each of the extending pieces is formed in a corresponding one of the arc-shaped guide holes. At the time of insertion, the respective tapered surfaces are brought into contact with the peripheral edge portions of the respective arc-shaped guide holes, so that the respective extended pieces are flexibly deformed so as to escape into the escape concave portions, respectively, and the respective tapered surfaces are formed. At the position over the peripheral edge of each arc-shaped guide hole, the extension pieces are returned to their original shapes, and the respective retaining portions are retained and engaged with the peripheral edge of each of the arc-shaped guide holes. 3. The rotary switch according to claim 1, wherein