TW201320137A - Operational device for tri-position switch - Google Patents

Abstract

The subject of the present invention is an operational device for operating a tri-position switch, whose action angles of the on/off state as a breaker and the off/ground state as a setting device are distinct. The solution is as follows: in a Geneva mechanism, in order to engage with the arc convexes (7a, 7b) disposed at the place of a driving gear (4) after an action is completed to thereby maintain the on, off, and ground positions of an output axle (9) and make the slow running of the driving gear (4) run freely, the arc concaves (8a, 8b, 8c) disposed at the Geneva gear (8) are configured to have angles of the off-to-on state and the off-to-ground state the same as the action angles (α, β) of the output axle (9). Furthermore, in order to engage with the rollers (6a, 6b) disposed at the place of the driving gear (4) and convey the rotation force to the output axle (9), the roller engagement trenches (8d, 8e) disposed at the Geneva gear 8) are configured to have angles equivalent to the halves of the respective action angles of the aforementioned off-to-on state and off-to-ground state of the arc concaves (8c). The rollers (6a, 6b) disposed at the driving gear (4) are configured as follows: the roller (6a) is configured at the revolution radius (R1) in the way of engaging with the aforementioned roller engagement trench (8d); meanwhile, the roller (6b) is configured at the revolution radius (R2) in the way of engaging with the aforementioned roller engagement trench (82).

Description

Operating device for three position switch

The present invention relates to an operating device for a switch, and particularly relates to a function of a circuit breaker and a grounding device, and switches three positions of "on", "off", and "ground" by one operating device. The operating device for the three-position switch.

The switching of the three positions of "on", "off", and "ground" of the circuit breaker with the grounding device by one of the operating devices by the Geneva mechanism is described, for example, in Patent Document 1.

7 and 8 are schematic views showing an example of an operation device using a prior art of a Geneva mechanism, and an output shaft 9 of the Geneva gear 8 is movable and movable via an operating mechanism 9a such as a link mechanism. The contact 10 is connected, and the movable contact 10 is rotated by the operating mechanism 9a by the rotation of the output shaft 9 of the Geneva gear 8, and is fixed contact with the fixed contact 11 of the circuit breaker or the grounding device. 12 for separation.

On the side of the drive gear 4, a drive roller 6a and an arcuate projection 7a are provided, and at the Geneva gear 8, a circular convex portion 7a of the drive gear 4 is formed to be engaged and held "on". The arcuate recesses 8a, 8b, and 8c at the "off" and "grounding" positions are further formed with drive roller engagement for driving the drive roller 4a of the drive gear 4 by the rotation of the drive gear 4 The grooves 8d, 8e are rotated by the drive gear 4, The drive roller 6a is engaged with the drive roller engagement grooves 8d and 8e, and the Geneva gear 8 is rotated.

At the "OFF" position of Fig. 7, the arcuate projection 7a provided at the drive gear 4 is engaged with the arcuate recess 8c of the Geneva gear 8, so that the output shaft 9 is held at "OFF". At the position, the input shaft 5 is idling, and since the drive roller 6a provided at the drive gear 4 is not engaged with the drive roller engagement groove 8d of the Geneva gear 8, the drive is driven. The rotational force of the input shaft 5 of the gear 4 is not transmitted to the output shaft 9 of the Geneva gear 8.

In FIG. 7 and FIG. 8 , when the reduction gear 3 fixed to the operation shaft 2 is rotated clockwise by a motor or a manual handle from the state of the "off" position, the reduction gear 3 is engaged with the reduction gear 3 The drive gear 4 rotates in a counterclockwise direction. By this rotation, the driving roller 6a revolves and engages with the driving roller engagement groove 8d of the Geneva gear 8 to rotate the output shaft 9 in the clockwise direction, and the arcuate convex portion 7a of the drive gear 4 and The engagement of the circular arc recess 8c of the Geneva gear 8 is released. In this manner, the arcuate recesses 8a and 8b of the Geneva gear 8 are also rotated by rotating the Geneva gear 8, but the arcuate recesses 8a and 8b are rotated from the arcuate recess 8c for holding the "off" position. It is provided at the same angle θ as the operating angle of the output shaft 9, and the driving roller engagement grooves 8d and 8e are provided at an angle θ/2 of 1/2 of the operating angle of the output shaft 9, and therefore, As shown in Fig. 8, generally, the "open" operation is completed, the arcuate convex portion 7a and the arcuate concave portion 8a are engaged, and the output shaft 9 is held at the "on" position.

In the state of the "on" position, if the input shaft 5 continues to rotate counterclockwise, the arcuate projection 7a and the arcuate recess 8a are engaged, so that the output shaft 9 is held in the "on" position. However, the drive gear 4 continues to idle until the drive roller 6a collides with the Geneva gear 8 to stop.

The operation of the circuit breaker from the "on" state to "off" is to rotate the operating shaft 2 counterclockwise by a motor or manually, and to rotate the Geneva gear 8 in the clockwise direction. In the case of operating the grounding device, it is the operation in the reverse direction of the operation of the aforementioned circuit breaker. In this operating device, since the driving roller is one and the revolution radius thereof is constant, the operating angles of the circuit breaker and the grounding device are the same.

[Previous Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 3-133018

In the aforementioned prior art operating device, there are the following problems.

(1) Since the driving gear is driven by one roller, the revolution radius is constant. Therefore, the operating angles of the circuit breaker and the grounding device must be the same. Therefore, when the operating angle of the circuit breaker is When the operating angle of the grounding device is different, if the driving roller is one operating device, the operating device cannot be operated by one operating device. Work.

(2) When the "off" operation is performed on the circuit breaker by electric power, if the motor is stopped after the end of the operation, even if the idling occurs, the idling is small enough to cause no problem. To the extent, or if the degree of turbulence that causes the problem occurs, the brake can be prevented from exceeding the operating area of the grounding device. However, when the "off" operation is performed manually, there is an open/close display, but since there is no stopper for stopping the handle, there is a tendency to be "off". Stopping, but erroneously overruning to the operating area of the grounding device, there is a concern that the actual operation cannot be performed.

(3) In the operation performed by the Geneva organization, at the beginning, the ratio of the action angle of the output side is geometrically increased relative to the action angle of the input side, and inversely proportional to the input The ratio of the torque output torque is reduced. At the end of the operation, the output torque characteristics are opposite to the above, and the output torque characteristics are U-shaped. Therefore, when the "on" or "ground" operation is performed manually, it is difficult to grasp the end point of the end of the operation due to the display and the feeling of the operation provided at the output shaft, and therefore, there is always going to be performed. The operation is continued until the drive roller and the Geneva gear collide and stop. At this time, since the operating angle of the driving roller from the end of the operation until the collision with the Geneva gear is large, it becomes necessary to perform an unnecessary operation, and since the position display of the switch display and the operation stop are The deviation of the operation becomes large, so the operability is not good.

Therefore, the present invention provides a method of switching between three positions of "on", "off", and "ground" by a single operation device when the operation angles of the circuit breaker and the grounding device are different. The operating device for the three position switch is performed.

The invention of claim 1 is an operating device for a three-position switch, characterized in that it is provided with "on", "off", and "ground" for a three-position switch having a circuit breaker and a grounding device. a Geneva gear that switches between three positions and a drive gear that drives a Geneva gear. The drive gear has a pair of arcuate projections and a pair of drive rollers on a side surface, and the Geneva gear is provided to be engaged with the aforementioned The arcuate convex portion holds the "open", "off", and "ground" positions, and the three arc recesses for idling the driving gear are idling, and between the arc recesses The driving roller is engaged to transmit a rotational force to a pair of driving roller engagement grooves at the output shaft of the Geneva gear, and the three circular arc recesses are from "off" to "open". The respective angles between the "off" and the "grounding" are arranged to be the same as the operating angle of the output shaft, and the pair of driving rollers are engaged with the groove, which will be "closed". Corner Each of the pair of driving rollers is placed in the "off" position, and one of the driving rollers is disposed on one of the same side rollers. The position where the engaging groove is engaged with each other, and the other driving roller is disposed in engagement with the other one of the roller engaging grooves on the same side. Location.

The invention of claim 2 is the operating device for a three-position switch according to claim 1, wherein the arc-shaped slit formed in the fixing plate fixed to the operating device is A switch bar that is slidable and can be moved back and forth in the axial direction to maintain a mode switch for "circuit breaker manual operation", "electric operation" or "grounding device manual operation", and the switching rod is provided with The stopper of the stopper pin is integrally formed, and the width of the slit is wider at the "off" position than the outer diameter of the switching rod, and at a position other than the switching rod The outer diameter is narrower but wider than the small diameter portion, and is formed such that the position of the stopper can be switched at the "off" position, but at the other position, the aforementioned The small-diameter sliding of the switching rod of the stopper does not allow the mode to be switched. The stopper pin is in the driving roller engagement groove of one of the aforementioned Geneva gears during the manual operation of the circuit breaker. When the grounding device is manually operated, it is moved and engaged in the driving roller engaging groove of the other one of the Geneva gears, and the driving roller is touched during the manual operation. The driving roller engages the shifting pin in the groove, and cannot be overrunned from "off", and in the electric operation, the pair is in a position that does not act on the driving roller. The driving roller is formed at the stopper at the intermediate position of the groove.

The invention of claim 3 is the operating device for a three-position switch according to claim 2, wherein the fixing plate is slidably Provided with a slider and provided with a manual handle insertion hole for opening and closing the external handle for rotating the operation shaft of the drive gear, the gate and the slider are electrically operated In the mode, the slider abuts against the stopper and cannot open the gate. In the manual operation mode, the slider does not abut against the stopper to open the gate and can open the manual handle insertion hole. The way to make the configuration.

In the case where the SF ₆ gas-sealed switch generally has a special requirement for the configuration of the housing machine and the machine performance in order to miniaturize it, there is a case where the operating angle of the circuit breaker and the operating angle of the grounding device are different. On the other hand, for example, a gear type operation device is relatively easy to correspond to a three-position switch device having a different operation angle by one unit. However, since the operation angle fluctuates due to a change in the operating voltage, To ensure contact reliability and insulation performance, it is necessary to set a longer stroke. The Geneva-type operating device of the present invention is capable of operating a three-position switch for different operating angles by one unit, and even if the operating voltage is changed, there is no change in the opening and closing angle. Since the operation is true and there is no need to consider the extra stroke, it is possible to provide a three-position switch with high operational reliability and small size and low cost.

The operation device of the present invention operates in the "on"-"off" operation of the circuit breaker by setting the stopper at the "off" position during manual operation. At the time of the "off"-"grounding" operation of the grounding device, a clear operation stop position can be obtained. Therefore, it is possible to prevent an erroneous operation exceeding the limit during the "off" operation. Further, the position of the stopper is detected by the limit switch, and the operation of the circuit breaker and the operation of the grounding device can be distinguished.

In the operation device of the present invention, when two driving rollers are arranged, when the operation is "on" or "ground" in the manual operation, the unnecessary operation angle from the end of the operation to the stop of the operation is reduced. The deviation between the display of the switch display position and the operation stop is also reduced.

In the operation device of the present invention, by providing a shutter mechanism at the manual operation shaft and interlocking with the stopper, it is possible to perform the following safety measures and the like: (1) Manual operation is not possible during the electric operation. (2) Electric operation is not possible during manual operation. (3) If the position is not "off", the above stopper cannot be switched. (4) In the manual operation, if the handle is temporarily removed without being in the "OFF" position, the above-mentioned stopper cannot be switched.

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

[Example 1]

In Fig. 1, at a reduction gear 3 fixed at an operating shaft 2 that is rotated by a motor or a manual handle, a drive gear 4 fixed to the input shaft 5 is engaged and configured to operate by Rotation of the shaft 2 The drive gear 4 is rotated by the reduction gear 3, and the Geneva gear 8 is driven.

The output shaft 9 of the Geneva gear 8 is the same as the prior art example shown in Figs. 7 and 8, and is coupled to the movable contact via an operating mechanism. The movable contact is rotated by the operating mechanism by the rotation of the output shaft 9 of the Geneva gear 8, and is "opened" by being in close proximity to the fixed contact of the circuit breaker or the fixed contact of the grounding device. "Off" action.

On the side of the drive gear 4, a pair of drive rollers 6a and 6b are provided on the right and left sides, and a pair of arcuate projections 7a and 7b are provided on the upper and lower sides. At the periphery of the Geneva gear 8, there is a space which is spaced apart, and at a portion corresponding to each of the "on", "off", and "ground" positions of the switch, circular arc recesses 8a, 8b are provided. 8c, and spaced apart, and a pair of driving roller engagement grooves 8d, 8e are provided on the left and right sides.

By the rotation of the drive gear 4, the drive rollers 6a, 6b enter the drive roller engagement grooves 8d, 8e of the Geneva gear 8, and are engaged, thereby rotating the Geneva gear 8. Further, by the rotation of the drive gear 4 and the rotation of the Geneva gear 8, the arcuate projections 7a, 7b of the drive gear 4 are engaged with the arcuate recesses 8a, 8b, 8c of the Geneva gear 8, and are respectively "opened". "," "off" and "grounding" positions are maintained.

The circular arc recesses 8a, 8b, and 8c of the Geneva gear 8 are arranged at an angle α from the "off" to "open" and from "off" to "ground". And β are the same, and the "on", "off", and "ground" positions of the output shaft 9 are guaranteed after the operation ends. Hold and keep the idle rotation of the drive gear 4 idling.

The angles of the driving engagement grooves 8d and 8e of the Geneva gear 8 are arranged in the circular arc recess 8a from the "closed" arc recess 8c to the "open" and the arc recess 8b of the "ground". The other action angles α, β are 1/2, that is, they are respectively arranged at the angles of α/2 and β/2. The revolving radii of the driving rollers 6a and 6b are engaged with the respective driving roller engagement grooves 8d and 8e, so that the driving roller 6a is R1 and the driving roller 6b is R2. Configuration, corresponding to the operating angle of the circuit breaker and grounding device.

Figure 1 shows the "off" position in the three positions. If the drive gear 4 rotates in the direction of the arrow (counterclockwise), it becomes the "open" operation of the circuit breaker, and Figure 2 shows the circuit breaker. The "open" position is displayed, and the driving roller 6a is revolved counterclockwise by the rotation of the driving gear 4 from the "off" position shown in FIG. 1, and is engaged with the driving roller of the Geneva gear 8. The groove 8d is engaged, and the output shaft 9 is rotated in the clockwise direction. By rotating the Geneva gear 8 at the operating angle α, the arcuate convex portion 7b and the arcuate concave portion 8a are engaged and "opened", and the motor 1 is stopped and the operation is terminated.

In addition, in FIG. 2, although the circular arc convex part 7b and the circular arc concave part 8a are engaged with each other, when the drive roller 6a is revolved in the clockwise direction at the time of a manual operation, it is input. The side system is capable of idling until the driving roller 6b collides with the Geneva gear 8, and this matter is shown by a dotted line in Fig. 2 . Further, if the driving roller 6a is rotated clockwise from the state of Fig. 2 Turning back to the state of Figure 1 and ending the "off" operation of the circuit breaker.

In the state shown in Fig. 1, the circuit breaker is "off" and the grounding device is also "off". In this state, if the driving roller 6b is further rotated in the clockwise direction, the "grounding" operation is performed, and the output shaft 9 of the Geneva gear 8 is rotated counterclockwise to the operating angle β, and the arc convex portion is formed. 7b and the arcuate recess 8b are engaged and held in the "ground" position, and the grounding operation is completed. Further, when the driving roller 6b is revolved in the clockwise direction, the driving roller 6a collides with the Geneva gear 8, and the operation system is stopped.

[Example 2]

Fig. 3 shows the state in which the stopper is set to be electrically operated, and the circuit breaker is electrically driven to end the "off" operation, and Fig. 4 is for the stopper to be manually operated as the circuit breaker, and The circuit breaker is manually displayed for the state in which the "off" operation is completed.

In FIG. 3 and FIG. 4, a slit 25a is formed in an arc shape centering on the output shaft 9 at a fixing plate 25 fixed to the operating device, and a switching bar is formed in the slit 25a. The 23 series is slidably configured. In the "off" state shown in the figure, in order to make the switching rod 23 slidable in the slit 25a, the width of the slit 25a is formed to be wider than the outer diameter of the switching rod 23, and It is free to switch to any of the three modes of "manual operation of circuit breaker", "electric operation", and "manual operation of grounding device".

The switching rod 23 is integrated with the stopper 21 provided with the stopper pin 22. The stopper 21 is rotatably centered on the output shaft 9 and disposed between the fixed plate 25 and the Geneva gear 8. The switching rod 23 can be switched to the "circuit breaker manual operation", "electric operation", and "sliding" in the slit 25a while being pulled toward the axial direction against the spring 24. The necessary mode among the manual operation of the grounding device is followed by returning the pulled switching lever 23 in the axial direction to be held by the spring 24. If the operation of "ON", "OFF", and "Ground" is performed in this state, the stopper 21 is pressed toward the Geneva gear 8 by the spring 24, and therefore, the Geneva gear 8 is attached. Act as one.

Further, although in any of the three modes, the width of the slit 25a is wider than the outer diameter of the switching rod 23 at the "off" position, but outside the "off" position, Since the width of the slit 25a is made narrower than the outer diameter of the switching rod 23, the switching rod 23 cannot be pulled toward the axial direction, and therefore the mode cannot be switched.

Further, in the case of the "electric operation" mode shown in Fig. 3, the small diameter portion 23a of the switching rod 23 is located at the same position as the fixed plate 25, and the "circuit breaker manual operation" and " In the case of the grounding position manual operation mode, the small diameter portion 23b of the switching rod 23 is located at the same position as the fixed plate 25. Further, since the angle at which the slit 25a is unfolded is set to be either an "on" operation or a "grounding" operation in either mode, the small diameter portions 23a, 23b of the switching rod 23 are not touched. Since the angle to the end of the slit 25a is normal, the "open" and "grounded" operations can be performed without hindrance. When the electric operation shown in Figure 3 In the case of the mode, since the driving rollers 6a and 6b do not interact with the stopper pin 22, the three-position operation can be performed by electric power.

As shown in FIG. 4, when the stopper pin 22 is placed in the driving roller engagement groove 8e by the switching lever 23 at the "OFF" position of the "circuit breaker manual operation" mode, One of the driving rollers 6a can be engaged with one of the driving roller engagement grooves 8d on the same side, but the other driving roller 6b is driven by the other one on the same side. The stopper pin 22 in the groove 8e is engaged by the roller, so that it is impossible to rotate further. Therefore, since the circuit breaker can manually engage the driving roller 6a in the driving roller engagement groove 8d, the "open" and "off" operations can be performed, and the "off" operation can be performed. In the case of the drive roller 6b, the drive roller 6b is caught in the drive roller engagement groove 8e, and the stopper pin 22 is prevented from rotating. Therefore, the drive roller 6b does not erroneously override "OFF" and continues to operate. Grounding. At this time, the stopper 21 is in a state of being pressed to the depth of the Geneva gear 8 side, and the small diameter portion 23b of the switching rod 23 is located at the position of the fixed plate 25. The width of the slit 25a of the fixing plate 25 is wider than the switching rod 23 at the "off" position, and is narrower than the outer diameter of the switching rod 23 at other positions. Since it is wider than 23a and 23b, the stopper 21 can be switched at the "OFF" position, but the small diameter portions 23d and 23b of the switching rod can slide even at other positions. It is impossible to switch. When operating in the case of a grounded device, it is also the same as the operation of the circuit breaker.

[Example 3]

In FIG. 5 and FIG. 6, a manual handle insertion hole 2a is provided in a casing (not shown) of the operation device, and is slidably slidable at a fixing plate 25 fixed to the operation device. A slider 26 is provided. At the housing of the operating device, a manual handle insertion hole 2a is provided, and the slider 26 is connected to the shutter 27 for opening and closing the manual handle insertion hole 2a through the operation device from the outside of the operation device. Make a link. The manual handle, which is attached to the operating device, is coupled to a mechanism that rotates the operating shaft 2 (see Figure 1). When the manual operation condition is satisfied by the control means (not shown), the shutter 27 rotates and opens the manual handle insertion hole 2a, and the slider 26 can be lowered.

In FIG. 5, since the stopper 21 and the stopper pin 22 are pulled to the front state because the system is set to the "electric operation" mode, the slider 26 hits the stopper 21 and cannot The shutter 27 is opened. The stopper 21 has an arc shape, and the slider collides with the "open", "off", and "ground" positions. Therefore, the manual handle insertion hole 2a is closed, so The manual handle is inserted into the hole 2a through the manual handle, and the manual operation is impossible. In this state, the limit switch 28 for displaying the "gate open" of the shutter 27 does not operate, and since the stopper 21 is pulled to the front, the "circuit breaker manual operation" or " The limit switches 29a and 29b for the manual operation of the grounding device do not operate.

In FIG. 6, since the stopper 21 and the stopper pin 22 are configured as a body In the state of being pushed to the position of the "circuit breaker manual operation" mode in the deep place, therefore, the slider 26 does not collide with the stopper 21 and slides freely, and the shutter 27 can be opened. State, therefore, it is possible to manually operate the operating shaft 2 by inserting the manual handle through the manual handle insertion hole 2a. In this state, the limit switch 28 is actuated and sends a signal until the handle is pulled out, and the "gate open" signal continues.

Further, the stopper 21 is a signal for operating the limit switch 29a and sending out the operation of the circuit breaker. This signal is continuously sent from "off" to "on" until the operation mode is switched to another mode. Further, the limit switch 29b does not operate at any position in the "manual operation of the circuit breaker" mode, but operates and sends a signal when it is in the "grounding device manual operation" mode. . In this way, the position of the stopper is detected by the limit switch, and the operation of the circuit breaker and the operation of the grounding device can be distinguished.

Further, in the insertion of the manual handle, since the slider 26 is prevented from moving in the axial direction of the stopper 21, if the handle is not pulled out, the handle cannot be switched to "electric". Operation" and "Manual operation of grounding device".

1‧‧‧Motor

2‧‧‧Operating shaft

2a‧‧‧Manual handle insertion hole

3‧‧‧Reduction gears

4‧‧‧ drive gear

5‧‧‧ Input shaft

6a, 6b‧‧‧ drive rollers

7a, 7b‧‧‧ arc convex

8‧‧‧Geneva gear

8a~8c‧‧‧ arc recess

8d, 8e‧‧‧ drive roller engagement groove

9‧‧‧ Output shaft

9a‧‧‧Operator

10‧‧‧ movable contact

11‧‧‧Circuit fixed contact

12‧‧‧ Grounding device fixed contact

21‧‧‧stops

22‧‧ ‧ stop pin

23‧‧‧Switch bar

23a, 23b‧‧‧Switching the small diameter of the rod

24‧‧ ‧ spring

25‧‧‧ fixed plate

25a‧‧‧Slots of fixed plates

26‧‧‧ slider

27‧‧‧ gate

28‧‧‧Restriction switch

29a, 29b‧‧‧ limit switch

Fig. 1 (a) is a side view showing an embodiment of the present invention, and (b) is a front view.

[Fig. 2] A diagram showing the "on" state of the circuit breaker of Fig. 1.

[Fig. 3] (a) is a side of Embodiment 2 (electric action) of the present invention The top view, (b) is the front view.

Fig. 4 (a) is a side view showing a second embodiment (manual operation) of the present invention, and (b) is a front view.

Fig. 5 (a) is a side view showing a third embodiment (electric operation) of the present invention, and (b) is a front view.

Fig. 6 (a) is a side view showing a third embodiment (manual operation) of the present invention, and (b) is a front view.

[Fig. 7] is an embodiment resulting from the prior patent technology and is a diagram for showing the "off" position.

[Fig. 8] A diagram showing the end time of the "on" operation of the circuit breaker of Fig. 1.

1‧‧‧Motor

2‧‧‧Operating shaft

3‧‧‧Reduction gears

4‧‧‧ drive gear

5‧‧‧ Input shaft

6a, 6b‧‧‧ drive rollers

7a, 7b‧‧‧ arc convex

8‧‧‧Geneva gear

8a~8c‧‧‧ arc recess

8d, 8e‧‧‧ drive roller engagement groove

9‧‧‧ Output shaft

Claims (3)

An operating device for a three-position switch, characterized in that: a Geneva gear capable of switching between three positions of "on", "off", and "ground" of a three-position switch having a circuit breaker and a grounding device, and a driving gear for driving a Geneva gear, wherein the driving gear has a pair of arcuate convex portions and a pair of driving rollers on a side surface, and the Geneva gear is provided to be engaged with the circular arc convex portion and to be "opened" And the "off" and "grounding" positions are used to hold and rotate the three arcuate recesses of the driving gear to idle, and between the arcuate recesses and the driving roller for engaging with the driving roller The rotation force is transmitted to a pair of driving roller engagement grooves at the output shaft of the Geneva gear, and the three circular arc recesses are from "off" to "open" and from "off" until The respective angles between the "grounding" are arranged to be the same as the operating angle of the output shaft, and the pair of driving roller engagement grooves are set to the output shaft from the "off" angle. of 1/2 of the angle, the pair of driving rollers are in the "off" position, and one of the driving rollers is disposed in engagement with one of the roller engaging grooves on the same side. At the position, the other driving roller is disposed at a position where it is engaged with the other one of the roller engaging grooves on the same side. The operating device for a three-position switch according to the first aspect of the invention, wherein the arc is formed on a fixing plate fixed to the operating device In the slits of the shape, the switching rods are slidable and can be moved back and forth in the axial direction to maintain a mode switch for "circuit breaker manual operation", "electric operation" or "grounding device manual operation". The switching rod is integrally formed with a stopper provided with a stopper pin, and the width of the slit is wider at an "off" position than the outer diameter of the switching rod. The portion is narrower than the outer diameter of the switching rod but wider than the small diameter portion, and is formed such that the position of the stopper can be switched at the "off" position, but other than At the position, although the small diameter of the switching rod of the stopper can be slid, the mode cannot be switched, and the stopper pin is one of the aforementioned Geneva gears during the manual operation of the circuit breaker. The driving roller is moved in the groove, and when the grounding device is manually operated, it is moved and engaged in the driving roller engaging groove of the other one of the Geneva gears, and is manually operated during each manual operation. The driving roller touches the stopper pin that has moved in the driving roller engagement groove, and cannot be overrun from "off", and the position is not in the foregoing when the electric operation is performed. The pair of driving roller engagement grooves that act to drive the roller are formed at the intermediate position of the driving roller, and are formed at the stopper. The operating device for a three-position switch according to the second aspect of the invention, wherein the slider is slidably provided at the fixing plate, and a hand for rotating the operating shaft of the driving gear is provided. The manual handle insertion hole for opening and closing is inserted from the outside, and the shutter and the slider are in the "electrically operated" mode, the slider is abutted against the stopper and the gate cannot be opened. In the manual operation mode, the slider does not abut against the stopper to open the aforementioned gate and can open the manual handle insertion hole for configuration.