JPH09320401A - Three-position operation mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a 3-position operation mechanism which reduces cost by utilizing an existing 2-position operation mechanism and raises productivity and enables accurate position operation by simplifying constituent elements in the operation mechanism and by controlling cumulative errors of parts' size. SOLUTION: A link 7 is connected to a movable contact 3a through links 3 and 9 and swings around a shaft 8 so that the movable contact 3a can come in contact with a contact 1 in load side and a contact 3 in ground side. A 2-position operation device 12 has 2 positions in a roller 13, on-position 13a and off-position 13b, and operates the link 7 so that the movable contact 3a can contact the contact 1 in load side by a starting operation of the roller 13. A stopper 14 is moved back and forth by a motor 16 and a driving part 15, and stops the turning of the link 7 strengthened by a tension spring 17 at positions corresponding to the off-position of a switch and the ground position, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating mechanism portion of a switch having three positions of ON / OFF and ground, which is used for a power switch, for example.

[0002]

7 and 8 are front views for explaining the operation of a conventional three-position operating mechanism described in, for example, Japanese Utility Model Laid-Open No. 3-116634. In the figure, 51
Is a lever fixed to a rotary shaft 55 that is output from an operating mechanism (not shown), and 52, 53, and 54 are rotary shafts 5, respectively.
5 is abutted against a lever 51 that rotates in accordance with the rotation of
1, which is a stopper for restricting the rotational movement of 1, and a stopper 53
The rotary shaft 57 is a movable contact of the switch, and the movable contact 57 is connected to the lever 51 by the arm 59, and the rotational movement of the lever 51 causes three positions of the entry position 57b, the cutting position 57a, and the ground contact position 57c. Is configured to have. Reference numeral 58 is a stopper that regulates the operation of the stopper 53.

Next, the operation of the above conventional three-position operating mechanism will be described. First, in the ON state, as shown by the broken line in FIG. 7, the lever 51 contacts the stopper 53, and the movable contact 57 connected to the lever 51 via the arm 59 is held at the ON position 57b. . Here, when the lever 51 is rotated counterclockwise about the rotation shaft 55, the lever 51 separates from the stopper 53 and rotates until it comes into contact with the stopper 52. And lever 5
1 contacts the stopper 52, and further rotation is blocked. At this time, the movable contact 57 is held at the off position 57a as shown by the solid line in FIG. 7, and the switching operation from the on state to the off state is performed. Further, when the lever 51 is rotated clockwise about the rotation shaft 55, the lever 51 separates from the stopper 52 and rotates until it comes into contact with the stopper 53. And the lever 51 is the stopper 5
When it comes into contact with 3, the rotation torque of the lever 51 is
It is received by the stopper 58 via 3 and further rotation is blocked. At this time, the movable contact 57 is in the entry position 57b.
Then, the switching operation from the OFF state to the ON state is performed. Therefore, when the stopper 53 is rotated clockwise about the rotation shaft 56, the lever 51 and the stopper 5 are rotated.
The engagement with 3 is released, and the lever 51 is rotated clockwise about the rotation shaft 55. And the lever 51
Engages with the stopper 54 to prevent further rotation. At this time, the movable contact 57 is held at the off position 57c as shown by the broken line in FIG. 8, and the switching operation from the on state to the grounded state is performed. In this way, the rotation about the rotation shaft 55 of the lever 51 as the center of rotation causes the stoppers 52 and 5 to rotate.
It is possible to accurately position the movable contact 57, which is regulated by abutting against each of 3, 54 and is connected to the lever 51 through the arm 59, at three positions of turning on / off and grounding.

[0004]

Since the conventional three-position operation mechanism is configured to have three positions as described above, it cannot be applied to a switch having two positions, which is the mainstream, and it is not widely used. However, there was a problem that productivity was poor. In addition, since there are many constituent elements of the operating mechanism, the cumulative error of the component dimensions becomes large, and there is also a problem that an accurate position operation of three positions cannot be performed.

The present invention has been made in order to solve the above problems, and improves the two-position operating mechanism that produces a large amount of production to enable three-position operation, thereby improving productivity and reducing costs. It is an object of the present invention to obtain a three-position operation mechanism that can achieve the above-mentioned operation, further simplify the constituent elements of the operation mechanism, suppress the accumulated error of the component dimensions, and perform an accurate position operation.

[0006]

[Means for Solving the Problems] 3 according to the first invention
The position operation mechanism is a three-position operation mechanism for operating a switch having three positions of an on-position, an off-position and a grounding position,
An end of one arm is connected to a movable contact of the switch through a link mechanism, and a portion between a first stop position corresponding to the entry position and a third stop position corresponding to the grounding position is centered on the shaft. A swinging link, a spring that urges the link in a direction to rotate from the first stop position to the third stop position side about the shaft, and a link that comes into contact with the link from the first stop position about the shaft. The stopper that blocks the rotational movement of the link that rotates toward the third stop position, and the first position and the third stop position that contact the stopper with the second stop position link that corresponds to the cut position, respectively. Stopper moving means for reciprocating between the contacting second position, and the other arm of the link centered on the insertion position and the axis for contacting the other arm of the link to restrict the link to the first stop position. Rocking position of the cutting position outside the outermost locus It is obtained by a two-position operation means having two positions La.

The three-position operating mechanism according to the second invention is
In the first invention, the stopper moving means converts the motor and the rotational torque of the motor into a linear moving force, and the linear moving force causes the stopper to reciprocate between the first position and the second position. And a driving means.

The three-position operating mechanism according to the third invention is
In the first aspect of the invention, the stopper moving means includes a motor and a crank that is rotatably driven by being engaged with a rotation shaft of the motor, and the stopper is rotated by driving the motor. The reciprocating movement is between the first position and the second position.

The three-position operating mechanism according to the fourth invention is
In the above-mentioned third invention, the first position and the second position of the stopper
The positions of and correspond to the positions of the dead points of the rotation of the crank.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. FIG. 1 shows a third embodiment according to the present invention.
FIG. 2 is a schematic diagram showing a grounded state of the position operation mechanism, FIG. 2 is a schematic diagram showing an off state of the three-position operation mechanism according to the first embodiment of the present invention, and FIG. 3 is a three-position operation according to the first embodiment of the present invention. FIG. 4 is a schematic diagram showing an inserted state of the mechanism, FIG. 4 is a view for explaining the operation of the two-position operating device in the three-position operating mechanism according to the first embodiment of the present invention, and FIG. It is a schematic diagram which shows the positional relationship of the link and roller in a position operation mechanism.

In the figure, 1 is a load side contact of a switch, 2
Is a contact on the ground side of the switch, and 3 is swinging about the shaft 4 so that the contact 3a on the power supply side as a movable contact at the end of one arm of the switch contacts the contact 1 on the load side and the contact 2 on the ground side. The link 5 is a conductor connected to the power source side, and 6 is a current collector provided on the shaft 4. The current collector 6 ensures electrical contact between the conductor 5 and the link 3. Reference numeral 7 is a link that swings around a shaft 8. One end of one arm of the link 7 is connected to the end of the other arm of the link 3 via a link 9. Reference numeral 10 is a pin that rotatably connects the link 7 and the link 9, and 11 is a pin that rotatably connects the link 3 and the link 9. Reference numeral 12 is a two-position operating device as a two-position operating means. The two-position operating device 12 is a roller 13
It is configured so that two positions, that is, the insertion position 13a and the cutting position 13b can be selected. Reference numeral 14 denotes a stopper that abuts on the other arm of the link 7 to restrict the counterclockwise rotation of the link 7 around the shaft 8 in FIG. 1, and 15 converts the rotational torque of the motor 16 into a linear reciprocating force. The drive unit 15 is a drive unit for reciprocating the stopper 14, and the drive unit 15 can be composed of, for example, a worm fixed to the output shaft of the motor 16 and a rack having inclined teeth meshed with the worm. A stopper 14 is attached to the tip of the. Reference numeral 17 is a tension spring for urging the link 7 to rotate counterclockwise about the shaft 8 in FIG. 1
Reference numeral 8 is a pressure contact device for applying a contact pressure between the ground side contact 2 and the power source side contact 3a at the time of grounding, and 19 is a pressure contact device for applying a contact pressure between the load side contact 1 and the power source side contact 3a at the time of the input operation. , 20 are insulating rods that electrically insulate the link 3 and the link 7. Here, the motor 16 and the drive unit 15
Constitutes the stopper moving means.

Reference numeral 30 denotes a closing cam for moving the roller 13 to two positions, that is, the insertion position 13a and the cutting position 13b. Reference numeral 31 denotes an output link which is a follower of the closing cam 30. The roller 13 is provided at one end of the output link 31. It is installed. 32 is a rotary shaft of the output link 31, 33 is attached to the other end of the output link 31, and is in contact with the closing cam 30 to make the closing cam 30.
For transmitting the rotational torque of the roller to the output link 31,
Is a rotating shaft of the closing cam 30. Reference numeral 35 is a closing spring that serves as a driving force for the closing to closing operation, and 36 is one end of the rotating shaft 3.
4 is a crank that is fixed to the other end and is connected to the closing spring 35 through a pin 37. The crank 36 transmits the stored force of the closing spring 35 to the closing cam 30 and the closing cam 30.
Is rotated.

First, the operation of the two-position operating device 12 will be described. In FIG. 4A, the roller 13 is in the cut position 13b.
Shows the off state held by the. In this off state, the stored force of the closing spring 35 is transmitted to the closing cam 30 via the crank 36, and acts so as to rotate the closing cam 30 clockwise about the rotation shaft 34.
Then, the rotation torque of the closing cam 30 acts so as to rotate the output link 31 counterclockwise about the shaft 32 via the roller 33. The rotation torque of the output link 31 is received by a closing latch (not shown), and the roller 13 is held at the cut position 13b. At this time, pin 3
7 is located at a position slightly rotated clockwise from the bottom dead center of the rotary shaft 34. Here, when the closing latch is released, the closing cam 30 is rotated clockwise about the rotation shaft 34 by the stored force of the closing spring 35. The rotation torque of the closing cam 30 is transmitted to the output link 31 via the roller 33, and the output link 31 is rotated counterclockwise about the shaft 32. Then, the roller 13 moves from the cut position 13b to the entry position 13a, where the output link 31 is held by the trip latch (not shown), and the closing operation is completed. Therefore, as shown in FIG. 4B, the two-position operation device 12 is in the closed state in which the roller 13 is held at the insertion position 13a.

Next, when the trip latch is released, the output link 31 rotates clockwise about the shaft 32 via the roller 13 by the load. Then, the output link 31 rotates to the position shown in FIG. 4A, is latched by the closing latch, and is kept in the OFF state. In addition, the input cam 30
Is rotated clockwise about the rotary shaft 34 by a charge motor (not shown) to the position shown in FIG. Then, the rotation torque of the closing cam 30 is transmitted to the closing spring 35 via the crank 36, and the closing spring 35 is charged,
Prepare for the next loading operation. The two-position operation device 12 does not have the power to move the roller 13 from the entry position 13a to the cutting position 13b, but it is moved by an external load, for example, a load such as an opening spring.

As described above, the roller 13 is moved from the cutting position 13b to the insertion position 13a by the closing operation of the two-position operating device 12.
And finally held at the entry position 13a, the holding operation of the entry position 13a is released by the releasing operation of the two-position operation device 12, and the entry position 13a is moved to the cutting position 13b. And the entry position 13a
The roller 13 held in contact with the end of the other arm of the link 7 that rotates counterclockwise about the shaft 8 in FIG. 5 and blocks the counterclockwise rotation operation. Further, as shown in FIG. 5, the roller 13 held at the cutting position 13b has a swing outermost diameter locus 21 and a gap 22 of the other arm of the link 7 rotating about the shaft 8 as shown in FIG. It is configured.

Next, the switching operation from the ON state shown in FIG. 3 to the OFF state shown in FIG. 2 will be described. FIG.
In the ON state shown in FIG.
It is held at the entry position 13a by the number 2. Further, the link 7 is urged by the urging force of the tension spring 17 so as to rotate counterclockwise in FIG. 3 about the shaft 8. Then, the end portion of the other arm of the link 7 comes into contact with the roller 13, the counterclockwise rotation of the link 7 is blocked, and the link 7 is held at the first stop position. At this time, link 3
Power source side contact 3a comes into contact with the load side contact 1, and the pressure contact device 1
9, the contact pressure between the power source side contact 3a and the load side contact 1 is maintained at a predetermined value. Therefore, the conductor 5, the current collector 6,
Electric power is supplied to the load side through the link 3, the power source side contact 3a and the load side contact 1. In this state, the holding of the roller 13 at the entry position 13a is released by the two-position operation device 12. Then, the link 7 has a tension spring 17
It is rotated counterclockwise about the shaft 8 by the urging force of. The roller 13 is pushed by the end portion of the other arm of the link 7 that rotates, and is moved from the entry position 13a to the intermediate position 13c as shown in FIG. Then, the other arm of the link 7 comes into contact with the stopper 14 to prevent further rotation of the link 7, and the link 7 is held at the second stop position. With the rotation operation of the link 7, the link 9 is moved upward in FIG. 3, the link 3 is rotated counterclockwise about the shaft 4, and as shown in FIG. The switch is switched to the off state, which is located at an intermediate position between the contact 1 and the ground side contact 2. The stopper 14 is preset so as to come into contact with the other arm of the link 7 when the power source side contact 3a is located at an intermediate position between the load side contact 1 and the ground side contact 2.

Next, the switching operation from the off state shown in FIG. 2 to the grounded state shown in FIG. 1 will be described.
First, the motor 16 is driven to retract and move the stopper 14 via the drive unit 15. Then, the urging force of the tension spring 17 causes the link 7 to rotate counterclockwise about the shaft 8 while the other arm contacts the stopper 14. With the rotation operation of the link 7, the link 9 is moved upward in FIG. 2, and the link 3 is rotated counterclockwise about the shaft 4. Then, the power supply side contact 3a contacts the ground side contact 2. At this time, the roller 13 is pushed by the end of the other arm of the link 7, is moved from the intermediate position 13c to the cut position 13b, and is held at the cut position 13b, as shown in FIG.
After contact, the link 3 further rotates, compresses the pressure contact device 18, and applies contact pressure between the power source side contact 3 a and the ground side contact 2. Then, the retracting movement of the stopper 14 is stopped,
The link 7 receives the counterclockwise rotational force about the shaft 8 due to the urging force of the tension spring 17 at the stopper 14 and is held at the third stop position. So the switch is
The off state is switched to the grounded state shown in FIG.

Further, from the grounded state shown in FIG. 1 to FIG.
The switching operation to the off state shown in FIG.
The motor 14 is driven, and the stopper 14 is driven via the drive unit 15.
Extend and move. Then, the link 7 is pressed against the other arm of the stopper 14 and rotates clockwise about the shaft 8 against the biasing force of the tension spring 17. This link 7
1, the link 9 is moved downward in FIG.
The link 3 is rotated clockwise about the axis 4. Then, the power source side contact 3a separates from the ground side contact 2, reaches an intermediate position between the load side contact 1 and the ground side contact 2, and the motor 1
The driving of 6 is stopped. Therefore, the switch is switched from the grounded state to the off state shown in FIG.

Further, the switching operation from the OFF state shown in FIG. 2 to the ON state shown in FIG. 3 will be described. The roller 13 is moved from the cutting position 13b to the insertion position 13a by the closing operation of the two-position operating device 12. With the movement of the roller 13, the end portion of the other arm of the link 7 is pressed against the roller 13, and the link 7 rotates clockwise about the shaft 8 against the biasing force of the tension spring 17.
When the roller 13 is held at the entry position 13a, the link 7 receives the counterclockwise rotational force about the shaft 8 due to the urging force of the tension spring 17 at the roller 13.
It is held in the first stop position. With the rotation operation of the link 7, the link 9 is moved downward in FIG. 2, and the link 3 is rotated clockwise about the shaft 4. Then, the power source side contact 3a contacts the load side contact 1. After contact, the link 7 further rotates, compresses the pressure contact device 19 to apply contact pressure between the power source side contact 3a and the load side contact 1, and rotation is blocked. Therefore, the switch is switched from the OFF state to the ON state shown in FIG.

As described above, according to the first embodiment,
A link 7 that swings between a first stop position corresponding to the switch on position and a third stop position corresponding to the ground contact position;
A tension spring 17 for urging the link 7 in the direction from the first stop position to the third stop position, and a first contact with the extension spring 17
14 which holds the link 7 at the second stop position or the third stop position corresponding to the switching position of the switch, and the stopper 14 for preventing the link 7 rotating from the stop position to the third stop position side. The motor 16 and the drive unit 15 for moving the stopper 14 back and forth as described above, and the insertion position 13a and the cutting position 1
2 position operating device 1 having 2 positions of roller 13 with 3b
2 so that the cutting position 13b is on the outer side of the miracle of the swinging outermost diameter of the link 7, and the cutting position 13b is changed to the insertion position 1
The two-position operating device 1 causes the roller 13 to press the link 7 and hold the link 7 at the first stop position by the inserting operation to the 3a.
2 is arranged. Therefore, since the existing two-position operating device 12 having a large production amount can be used, a three-position operating mechanism can be obtained in which the productivity is increased and the cost can be reduced. Further, compared to the conventional three-position operation mechanism, the number of constituent parts can be reduced, the cumulative error of the part size can be suppressed, and the three-position operation can be performed accurately.

Embodiment 2 FIG. FIG. 6 is a schematic diagram for explaining the operation of the three-position operation mechanism according to the second embodiment of the present invention. In the figure, reference numeral 25 is a crank rotatably provided around a shaft 26, and a gear is provided on the outer periphery of the crank 25 and meshes with the rotating shaft of the motor 16. 27
Is a stopper provided upright on the crank 25, and this stopper 27 abuts on the other arm of the link 7 to prevent the link 7 from rotating. 27a is the position (first position) of the stopper 27 when the switch is off, and 27b is the position (second position) of the stopper 27 when the switch is on the ground.
The positions 27a, 27b of the stopper 27 are
The line connecting the shaft centers of the stopper 27 and the stopper 27 is the shaft 8 and the stopper 27.
It corresponds to the so-called dead point of rotation, which is orthogonal to the line connecting the axes of and. Here, the motor 16 and the crank 25
Constitutes the stopper moving means. The drive unit 15
Further, the second embodiment has the same configuration as that of the first embodiment except that the crank 25 and the stopper 27 are used instead of the stopper 4.

Since the switching operation from the ON state to the OFF state and the switching operation from the OFF state to the ON state are the same as those in the first embodiment, the description thereof will be omitted here.

Next, the switching operation from the off state to the grounded state will be described. First, the motor 16 is driven to rotate the crank 25 counterclockwise about the shaft 26. Then, the stopper 27 moves from the position 27a to the position 27b.
When it reaches, the drive of the motor 16 is stopped. Then
Due to the urging force of the tension spring 17, the link 7 rotates counterclockwise about the shaft 8 while the other arm contacts the stopper 27. As the link 7 rotates, the link 9
Is moved upward and the link 3 is rotated counterclockwise about the shaft 4. Then, the power supply side contact 3a contacts the ground side contact 2. After the contact, the link 3 further rotates, compresses the pressure contact device 18, and the power source side contact 3a and the ground side contact 2
A contact pressure is applied between and to prevent rotation. Therefore, the switch is switched from the off state to the grounded state.

Further, the switching operation from the grounded state to the off state will be described. The motor 16 is driven to rotate the crank 25 clockwise about the shaft 26. Then, when the stopper 27 reaches the position 27a from the position 27b, the driving of the motor 16 is stopped. Then link 7
The other arm is pressed by the stopper 27 and the tension spring 1
It rotates clockwise about the shaft 8 against the biasing force of 7. With the rotation operation of the link 7, the link 9 is moved downward, and the link 3 is rotated clockwise about the shaft 4. Then, the power supply side contact 3a separates from the ground side contact 2, reaches an intermediate position between the load side contact 1 and the ground side contact 2, and the driving of the motor 16 is stopped. Therefore, the switch is switched from the grounded state to the off state.

Furthermore, the operation from the off state to the on state will be described. The roller 13 is moved from the cutting position 13b to the insertion position 13a by the closing operation of the two-position operating device 12. With the movement of the roller 13, the end portion of the other arm of the link 7 is pressed by the roller 13, and the link 7 rotates clockwise around the shaft 8. With the rotation operation of the link 7, the link 9 is moved downward in FIG.
Is rotated clockwise about axis 4. Then, the power source side contact 3a contacts the load side contact 1. After contact, the link 7 further rotates, compresses the pressure contact device 19 to apply contact pressure between the power source side contact 3a and the load side contact 1, and rotation is blocked. Therefore, the switch is switched from the off state to the on state.

According to the second embodiment, since the crank 25 that meshes with the rotary shaft of the motor 16 to rotate and the stopper 7 that is erected on the crank 25 are provided, the stopper 27 is the crank 25. When the switch 7 is in contact with the switch 7 in the off state and the grounded state, the link 7 is prevented from rotating around the axis 8 to maintain the switch in the off state and the grounded state. The same effect as can be obtained. Further, since the stopper 27 abuts on the link 7 in the open state and the grounded state of the switch respectively at the positions 27a and 27b corresponding to the dead center of rotation of the crank 25, the rotation operation of the link 7 is blocked. It can withstand a large load and can perform more accurate position operation.

[0027]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, in the three-position operating mechanism for operating the switch having the three positions of the on-position, the off-position and the grounding position, the end of one arm is provided with the switch via the link mechanism. Connected to the movable contact of No. 3, and the first stop position corresponding to the entry position about the axis and the third corresponding to the grounding position.
Link that swings between the shaft and the stop position, a spring that biases the link in the direction of rotating from the first stop position to the third stop position side about the shaft, and the center of the shaft that contacts the link. As a stopper, a stopper that blocks the rotational movement of the link that rotates from the first stop position to the third stop position side, and a first position and a third position that contact the stopper at the second stop position link corresponding to the cut position. A stopper moving means for reciprocating between a second position in contact with the link at the stop position, and an insertion position and axis for contacting with the other arm of the link to restrict the link to the first stop position. And a two-position operating means having two positions of the roller at the cut position located outside the swinging outermost diameter locus of the other arm of the link.
Position operation means can be used, productivity can be improved and cost can be reduced, and further, the number of constituent parts can be reduced as compared with the conventional three-position operation mechanism, and the cumulative error of part dimensions can be suppressed.
A three-position operation mechanism capable of accurately performing three-position operation can be obtained.

According to the second invention, in the first invention, the stopper moving means converts the motor and the rotation torque of the motor into a linear moving force, and the linear moving force causes the stopper to move to the first position. Since the drive means for reciprocating between the second position and the second position is provided, the stopper moving means can be realized with a simple configuration.

According to a third aspect of the present invention, in the first aspect, the stopper moving means includes a motor and a crank that is erected with the stopper and is rotatably driven by being meshed with a rotation shaft of the motor. Since the crank is rotated by driving the motor so that the stopper reciprocates between the first position and the second position, the stopper moving means can be realized with a simple configuration.

According to the fourth aspect of the present invention, in the third aspect of the invention, the first position and the second position of the stopper are made to correspond respectively to the positions of the dead points of the rotation of the crank, so that a large load is applied. It can withstand even more, and more accurate position operation can be performed.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a grounded state of a three-position operation mechanism according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing an off state of the three-position operation mechanism according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing an inserted state of the three-position operation mechanism according to the first embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of the two-position operating device in the three-position operating mechanism according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram showing a positional relationship between links and rollers in the three-position operation mechanism according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating the operation of the three-position operation mechanism according to the second embodiment of the present invention.

FIG. 7 is a front view illustrating the operation of a conventional three-position operation mechanism.

FIG. 8 is a front view illustrating the operation of a conventional three-position operation mechanism.

[Explanation of symbols]

3, 9 link (link mechanism), 3a power source side contact (movable contact), 7 link, 8 axis, 12 2 position operation device (2 position operation means), 13 roller, 13a insertion position, 1
3b Cutting position, 14, 27 Stopper, 15 Driving part (driving means, stopper moving means), 16 Motor (stopper moving means), 17 Extension spring, 21 Swing outermost diameter locus, 25 Crank (stopper moving means), 27a
Position (first position), 27b position (second position).

Claims (4)

[Claims] 1. A three-position operating mechanism for operating a switch having three positions, an on-position, an off-position and a grounding position, wherein an end of one arm is connected to a movable contact of the switch via a link mechanism. A link that swings between a first stop position that corresponds to the entry position and a third stop position that corresponds to the ground contact position about an axis; and A spring urging in a direction to rotate from a stop position to the third stop position side; and a spring that comes into contact with the link and rotates about the shaft from the first stop position to the third stop position side. A stopper for preventing the link from rotating, a first position for bringing the stopper into contact with the link in a second stop position corresponding to the cut position, and a second position for contacting the link in the third stop position. Move back and forth between positions Stopper moving means and said first the link abuts the other arm of the link
And a two-position operation means having two positions of the roller at an insertion position that is regulated to the stop position and a cut position that is located outside the swinging outermost diameter locus of the other arm of the link about the shaft. A three-position operation mechanism characterized by being provided. 2. The stopper moving means converts a motor and a rotational torque of the motor into a linear moving force, and the linear moving force causes the stopper to reciprocate between a first position and a second position. The three-position operating mechanism according to claim 1, further comprising: 3. The stopper moving means includes a motor and a crank which is rotatably driven by a stopper and which is erected on a rotation shaft of the motor. The motor is driven to rotate the crank to rotate the crank. The three-position operating mechanism according to claim 1, wherein the stopper is configured to reciprocate between the first position and the second position. 4. The three-position operating mechanism according to claim 3, wherein the first position and the second position of the stopper correspond to the dead center position of the rotation of the crank, respectively.