JP2625469B2 - Electric operating device for circuit breakers and breakers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention uses a motor as a drive source, converts the rotational motion of the motor into the linear motion of a moving body, and converts the rotational motion of the motor into a circuit breaker. The present invention relates to an electric operation device for a circuit or a breaker for operating a handle.

(Prior Art) A device that uses a motor as a drive source, converts the rotational motion of the motor into a linear motion of a moving body, and operates a handle of a circuit or a breaker has been conventionally known. In an electric operation device using a motor of this type as a drive source, a ball screw mechanism is generally employed as a mechanism for converting the rotational movement of the motor into a linear movement of a moving body. Is rotated by a motor to linearly move a moving body having a nut non-rotatably mounted, and the handle is operated using the linear movement of the moving body.

(Problems to be solved by the invention) However, as a rotary motion-linear motion conversion mechanism,
With a ball screw mechanism, if the threaded rod is directly connected to the motor, the rotation speed of the motor is high, so the moving speed of the nut is too fast, and the motor must have a high output. It is a win. Therefore, the rotation of the motor is reduced and transmitted to the threaded rod.
For this purpose, a separate reduction mechanism composed of a gear train and the like is required.Especially, when a small-output, high-speed rotation type motor is used for downsizing, the reduction ratio must be increased. It becomes large and the whole electric operation device becomes large. Further, the ball screw mechanism is generally expensive, which causes an increase in the manufacturing cost of the apparatus.

The present invention has been made in view of the above circumstances, and has as its object the purpose of operating a motor as a drive source, converting the rotational movement of this motor into a linear movement of a moving body, and operating a handle of a circuit or a breaker. The mechanism that converts the rotational motion of the motor into linear motion can have a deceleration function itself, so that a separate speed reduction device is not required, and the overall size can be reduced. An object of the present invention is to provide a circuit and an electric operating device for a breaker which can reduce the manufacturing cost without using an expensive ball screw mechanism for the motion-linear motion conversion mechanism.

[Constitution of the Invention] (Means for Solving the Problems) A transmission operating device for a circuit breaker or a breaker according to the present invention comprises: a motor;
It is provided with a rotary motion-linear motion conversion mechanism that converts the rotation of the motor into a linear motion of the moving body, and an operating mechanism that operates the handle based on the linear motion of the moving body. The rotary motion-linear motion conversion mechanism includes a small-diameter-side threaded rod, and an inner thread or an outer thread of the small-diameter-side threaded rod having an inner diameter or an outer diameter larger than an outer diameter of the small-diameter side threaded rod. A nut or a large-diameter side threaded rod formed with a female thread or a male thread to be screwed into, and one of the small-diameter threaded rod and the nut or the large-diameter threaded rod is rotationally driven by the motor, and the other is rotated. The movable body is rotatably provided.

(Operation) It is assumed that the rotary motion-linear motion conversion mechanism is configured such that, for example, a small-diameter side threaded rod is rotationally driven by a motor, and a nut is rotatably provided on the moving body. In this case, when the motor rotates, the small-diameter-side threaded rod rotates, and the rotation is transmitted to the nut by the frictional force between the male screw of the small-diameter-side threaded rod and the female thread of the nut. In this case, assuming that the diameter of the male screw of the small-diameter threaded rod is D ₁ and the diameter of the female thread of the nut is D ₂ , the nut per rotation of the small-diameter threaded rod on the driving side is (D ₁ /
D ₂ ), so that they are [1- (D ₁ / D ₂ )]
Only the relative rotation. At this time, since the small-diameter-side threaded rod cannot move in the axial direction, the nut is rotated per rotation of the small-diameter-side threaded rod [(one pitch amount of screw) × (1-D ₁ /
D ₂ )] in the axial direction (linear motion).
Accordingly, the rotational motion-linear motion conversion mechanism can convert the rotational motion of the motor into linear motion, and at the same time, reduce the rotation of the motor and convert it into linear motion.

For this reason, it is not necessary to separately provide a speed reduction mechanism constituted by a gear train or the like, and the entire electric operation device is reduced in size. In this case, if the reduction ratio of the rotary motion-linear motion conversion mechanism is increased, a small output high-speed rotation type small motor can be employed, so that the entire electric operation device is further reduced in size.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

First, FIG. 7 shows the circuit breaker and the breaker by itself,
In order to explain the configuration of the circuit breaker 1 with reference to FIG.
Reference numeral 2 denotes a case made of an insulating material. A cover 3 is attached to the upper surface in the figure, and a fixed contact 4 is provided on the inner bottom. Reference numeral 5 denotes a movable arm whose one end is rotatably supported by a rotating shaft 6 provided on the case 2. A movable contact 7 is provided on the other end of the arm. The movable contact 7 is movable. The arm 5 is moved toward and away from the fixed contact 4 by the rotation of the arm 5. Reference numeral 8 denotes a handle, the tip of which is swingably supported by a shaft 9 provided on the case 2, and a handle 8 a of the handle 8 protrudes outward through a hole 3 a formed in the cover 3. 10 is handle 8
Is an opening and closing mechanism for moving the movable contact 7 toward and away from the fixed contact 4 in conjunction with the operation of the catch 11 and the first link 12 and the second link constituting a toggle link mechanism.
13, a tension coil spring 14 and a latch 15. The catch 11 is rotatably supported by a shaft 16 provided in the case 2, and the tip of the catch 11 is detachable from the latch 15. The latch 15 is always in a state in which the tip of the catch 11 is locked, and releases the lock of the catch 11 when the trip device 17 operates by detecting an overcurrent. . The first link 12 has one end rotatably connected to the catch 11 by a pin 18 and the other end rotatably connected to one end of the second link 13 via a pin 19. The other end of the second link 13 is rotatably connected to the movable arm 5 via a pin 20. Then, the first link 12 is prevented from turning in the direction of arrow A by the impact pin 21 erected on the first link 12 being impacted against the outer edge of the catch 11. The tension coil spring 14 is bridged between the pin 19 and a pin 22 provided near the handle 8a of the handle 8, and the first link 12 and the second link
Pin 19 for connecting the link 13 with the link 13 is urged in the direction of arrow B, whereby the catch 35 is urged in the direction of arrow D so that the movable arm 25 rotates in the opening direction (counter-arrow C direction). doing. Further, a catch 23 is fixed to the handle 8, and when the catch 11 is released from being locked by the latch 15 and rotated in the direction of arrow D, the projection 11 of the catch 11 is rotated.
a is stopped to prevent the catch 11 from rotating in the direction of arrow D.

In the circuit breaker 1 having the above-described configuration, when the handle 8 is turned in the direction of arrow E in the ON state of FIG. 7, the tip of the catch 11 is locked by the latch 15 as described above, and Since the first link 12 is rotationally urged in the direction of arrow A by the spring force of the extension coil spring 14 and stops at the position where the impact pin 21 abuts against the edge of the catch 11, the second link 12 is stopped.
The link 13 rotates the movable arm 5 in the direction of arrow C to bring the movable contact 7 into contact with (closed to) the fixed contact 4.

Next, the steering wheel 8 is rotated in the direction indicated by the arrow E and the seventh
When the handle is set to the off position shown in the drawing, the line connecting the pin 22 and the pin 19 moves to the tip end side of the catch 11 beyond the pin 18 with the movement of the handle 8, that is, the movement of the pin 22, so that the tension coil The spring 14 urges the first link 12 to rotate in the direction indicated by the arrow A, whereby the second link 13 rotates the movable arm 5 in the direction indicated by the arrow C to move the movable contact 7 to the fixed contact 4. Release (opening).

When the tripping device 17 is operated from the ON state in FIG. 7, the latch 15 releases the locking of the distal end of the catch 11 as described above, so that the catch 11 and the first link 12 apply the urging force of the tension coil spring 14. Arrow D about the axis 16
Arm 5 is rotated in the direction
Is rotated in the direction of the arrow C to separate the movable contact 7 from the fixed contact 4. On the other hand, the arrow D of the first link 12
With the rotation in the direction, the extension coil spring 14 is attached to the handle 8.
7, the handle 8 is turned in the direction opposite to the arrow E and moves to the trip position shown in FIG.

When the tripping device 17 is operated as described above and the movable contact 7 is separated from the fixed contact 4, the handle 8 is turned from the trip position in the direction indicated by the arrow E to exceed the off position. When the reset position is reached, the catch 23 comes into contact with the projection 11a of the catch 11, and the catch 11
, So that its tip passes through the latch 15. Thereafter, when the handle 8 is rotated in the direction of arrow E to return to the ON position, the tip of the catch 11 is latched.
15 and all return to the on state shown in FIG.

The electric operating device 24 for operating the circuit 8 and the handle 8 of the breaker 1 as described above is shown in FIGS. 1 and 2, and the electric operating device 24 will be described below. Numeral 25 denotes a case mounted on the case 2 of the circuit breaker 1 and the upper surface thereof is covered with a cover 26. 27 is case 25
The support 27 has vertical wall portions 27a and 27b orthogonal to each other, and one of the vertical wall portions 27a has a DC reversible motor 28 as a drive source of the electric operation device 24. Is installed. The other vertical wall 27
A pair of upper and lower guide shafts 30, 30 is mounted between the support shaft 29 and a support frame 29 fixed to the inner bottom of the case 25 so as to face the vertical wall portion 27b.
A moving body 31 is slidably supported at 0,30. Numeral 32 denotes a rotary motion-linear motion conversion mechanism for reducing the rotation of the reversible motor 28 and converting the rotary motion into a linear motion of the moving body 31. As shown in FIG. And a nut 34 having an inner diameter larger than the outer diameter of the screw rod 33 and an inner thread formed with an internal thread 34a having the same pitch as the external thread 33a. It is formed by forming a female screw on the inner peripheral surface of the inner race of the ball bearing 35. And
The outer race 36 of the ball bearing 35 moves the moving body 31
The nut 34 is rotatably attached to the movable body 31 by being fitted inside. The small-diameter side screw rod 33 is inscribed in the nut 34 and penetrates through the nut 34 so that the male screw 33a is screwed into the female screw 34a. One end of the small-diameter screw rod 33 is supported by the other vertical wall 27b of the support 27. (Not shown) so as to be rotatable. And the small diameter side threaded rod 33
The bevel gears 37 and 38 having different large and small diameters are attached to one end of the reversible motor 28 and the rotating shaft 28a of the reversible motor 28. Stick 33
To be communicated to. In FIG. 3, reference numerals 39 and 40 denote a pair of ball bearings which are fitted to the moving body 31 so as to be located on both sides of the ball bearing 35. This prevents the male screw 33a and the female screw 34a of the nut 34 from being disengaged from each other.

Here, the principle of the rotary motion / linear motion conversion mechanism 24 having the above configuration will be described. That is, when the small diameter side threaded rod 33 is rotated by the reversible motor 28, when the frictional force between the male screw 33a and the female screw 34a is larger than the rotational resistance between the nut 34 and the outer lay 36, the male screw 33a and the female screw 34a The nut 34 also rotates due to the frictional force of. At this time, assuming that the diameter of the small-diameter screw bar 33 is D ₁ and the diameter of the nut 34 is D ₂ , the nut 34 rotates by (D ₁ / D ₂ ) per rotation of the small-diameter screw bar 33. . Thus, the nut 34 is per revolution of the small diameter side screw rod _{33 [1- (D 1 / D} 2)] by the fact that relative rotation. At this time, since the small-diameter-side threaded rod 33 does not move in the axial direction, the moving body 31 to which the nut 34 is attached is linearly moved in the axial direction by [p × (1-D ₁ / D ₂ )]. Movement (where p is one pitch amount of the screw).

Reference numeral 41 denotes an operation mechanism for operating the handle 8 of the circuit breaker 1 based on the linear motion of the moving body 31. The operating mechanism 41 is provided to the moving body 31 when the moving body 31 moves in the direction of arrow F. An operating body 42 that is pressed and moved in the same direction, and this operating body
And a compression coil spring 43 which is compressed by the movement of the arrow 42 in the direction of arrow F to accumulate the spring force. The operation body 42 is
The pair of guide shafts 30 are slidably supported by one of the guide shafts 30, and a connecting portion 42a having a rectangular hole 44 protrudes from one side thereof. The distal end portion of the handle 8 is inserted into the rectangular hole 44 of the connecting portion 42a, so that the handle 8 can be rotated by the movement of the operating body 42 in the directions indicated by the arrows F and F. Has become. In this case, the operating tool 42
1 is in the "ON", "OFF", "TRIP" and "RESET" positions in FIG. 1, the handle 8 is in the ON, OFF, TRIP and RESET positions. In this case, when the operating tool 42 is set to the “OFF” position, the handle 8 is actually positioned slightly “on” from the “off” position. Is securely locked by the latch 15. Then, as will be clear from the description below, when the moving body 31 moves in the direction of arrow F, the operating body 42 is moved to the “RESET” position, and thereafter,
It reverses and returns in the direction of the arrow F. On the other hand, the compression coil spring 43 has a spring seat 46 whose one end is rotatably supported by the support frame 29 by a pin 45.
, And the other end is held by a spring seat 48 rotatably supported by the operating body 42 by a pin 47. And
The compression coil spring 43 allows the moving body 31 to “RESE” the operating body 42.
After moving to the “T” position, when returning in the anti-arrow F direction, the operating body 42 is moved in the anti-arrow F direction by following the return movement of the moving body 31 by the stored elastic force. When the body 42 reaches the `` OFF '' position, the latch lever 4
It is locked to 9 and stops at that position. The latch lever 49 is provided with a pin 50 on the inner bottom of the case 25.
, And is urged to rotate in the direction of arrow G by the torsion coil spring 51.
When the operation body 42 is moved in the direction indicated by the arrow, it turns in the direction indicated by the arrow G against the elastic force of the torsion coil spring 51 to allow the operation body 42 to pass therethrough. When moved in the F direction, the operation body 42 is locked by the step portion 49a on one end side and stopped at the "OFF" position. Reference numeral 52 denotes a release lever rotatably supported by a pin 53 on the inner bottom of the case 25. One end of the release lever is located below the other end of the latch lever 49. When the moving body 31 is moved in the direction of arrow H from the original position indicated by HP, the moving body 31 rotates in the direction of arrow H, and the latch lever 49 is rotated in the direction of arrow G against the spring force of the torsion coil spring 51. Then, the latch of the operating body 42 by the latch lever 49 is released.

In the above configuration, an electrical circuit configuration for rotating the reversible motor 28 in the forward and reverse directions is shown in FIG. This sixth
In the figure, 54 is a DC power supply circuit, 55 is a constant voltage circuit, and 56 to
59 is a transistor for forming a forward rotation circuit and a reverse rotation circuit of the reversible motor 28, and 60 and 61 are transistors 56 and
It is a driving transistor for turning on and off 57.
Further, 62 denotes a control circuit for controlling on and off of the transistors 58 to 61, which is a thyristor 63, 64, OFF-operation to turn on to supply the gate trigger current to the thyristor 63 receives the OFF command signals S ₁ a control circuit 65, the thyristor 64 receives an oN command signal S ₂ and the oN operation diversion control circuit 66 to be turned on by supplying a gate trigger current, the normal signal S ₃
A transistor 67 for generating a reverse rotation signal transistor 68 of the S ₄ for generating, a micro switch 69 and 70. which are switching operation by the movement of the moving body 31 and the operation member 42. As shown in FIG. 2, the micro switches 69 and 70 are located on both sides of the base plate 71 attached between the upper end of the vertical wall 27b of the support 27 and the upper end of the support frame 29. Is provided. The micro switch 69 is a mobile
The moving body 31 is at the original position HP, and the pressing element 31a lightly presses the push button 69a as an actuator via the leaf spring 72. When it is separated from the leaf spring 72, the contact piece c-b
When the pressing member 31a of the moving body 31 strongly presses the push button 69a via the leaf spring 72 in the closed state, the mode is switched from the closing between the contact pieces c and b to the closing between the contact pieces c and a. It has become. On the other hand, the micro switch 70 is switched by the operating body 42 via the hysteresis mechanism 73.
That is, as shown in FIG. 2, the hysteresis mechanism 73 is movably held by a holder 74 provided on the base plate 71, and is provided with a slider 76 constantly urged in the direction of arrow I by a compression coil spring 75. A lever 79 rotatably supported by a pin 78 so as to face a leaf spring 77 that presses a push button 70a as an actuator of the micro switch 70 on the base plate 71.
And a toggle tension coil spring 80 hung between a pin 79a projecting from the lever 79 and a pin 76a projecting from the slider 76. In the hysteresis mechanism 73, when the operating body 42 is at the "ON" position as shown in FIG. 4, the slider 76 is moved in the direction of arrow I by the compression coil spring 75 as shown in FIG. Since the pin 76a is located on the arrow I side relative to the pin 78 serving as the pivot of the lever 79, the toggle tension coil spring 80 rotates the lever 79 in the arrow J direction and separates from the leaf spring 77. In this state, the microswitch 70 is closed between the contact pieces c and b. And the reversible motor 28
When the operating body 42 is moved in the direction of arrow F due to the forward rotation, the operating body 42 abuts on the slider 76 and moves it in the direction opposite to arrow I against the elastic force of the compression coil spring 75. When the operating body 42 reaches the "RESET" position, the pin 76a of the slider 76 is located on the side opposite to the direction of the arrow I with respect to the straight line connecting the pins 78 and 79a, so that the toggle coil spring 80 for toggle is used. Is instantaneously rotated in the direction of the arrow J by the spring force to press the push button 70a via the leaf spring 77, whereby the microswitch 70 switches to closing between the contact pieces c and a, as described later. In addition, a reversing circuit of the reversible motor 28 is formed. Due to the formation of the reverse rotation circuit, when the reversible motor 28 rotates reversely, the moving body 31 reversely moves in the direction indicated by the arrow F, so that the operating body 42 also moves in the direction indicated by the arrow F to the “OFF” position. Even if the slider 76 moves in the direction of the arrow I with the movement of the operation body 42, the pin 76a is still on the side opposite to the direction of the arrow I with respect to the pin 78, and the microswitch 70 moves between the contact pieces c-a. It remains closed and does not switch. Then, when the latch of the operating body 42 by the latch lever 49 is released and the operating body 42 moves in the direction indicated by the arrow F, when the operating body 42 moves a certain distance from the “OFF” position to the direction of the arrow F, the slider 76 Pins 76
a is located on the side of the arrow I with respect to the straight line connecting the pins 78 and 79a, the lever 79 instantaneously rotates in the direction of the arrow J and separates from the leaf spring 77, whereby the microswitch 70 is brought into contact. Switching from the closing between the pieces c and a to the closing between the contact pieces c and b is performed. Therefore, the micro switch 70 is
When the arrow moves in the direction of arrow F, the switching operation is performed at the “RESET” position.
Hysteresis is provided so that the switching operation is performed at the time of further moving to the “ON” position side from the “F” position.

Next, the operation of the above configuration will be described. Now, as shown in FIG. 4, the operating body 42 is turned "ON" by the spring force of the compression coil spring 43.
It is assumed that it is pushed back to the position and is in contact with the moving body 31 at the original position HP. In this state, the pressing element 31a of the moving body 31 is in a state of lightly contacting the leaf spring 72, and the micro switch 69 is in a state of closing between the contact pieces c and b. Also, as shown in FIG. 5, the lever 79 is turned in the direction of arrow J and is separated from the leaf spring 77,
Is in a closed state between the contact pieces c and b. In this state, the off command signal S _{1 is} sent to the off operation control circuit 65 by remote control.
Is input, a gate trigger current flows through the thyristor 63. Thus, the thyristor 63 is turned on, as a result, transistor 67 is turned on to output a normal signal S _3. The inverted signal S _3, the transistor 59 is thereby turned on to turn on the transistor 56 the transistor 60 is turned on, the forward circuit shown by the arrow K in Figure 6 is formed, reversible motor 28 is forward ( (The direction in which the moving body 31 is moved in the direction of arrow F). The rotation of the reversible motor 28 is controlled by the bevel gear 3
The speed is reduced by 7, 38 and transmitted to the small-diameter screw bar 33, and the rotation of the screw bar 33 is reduced and transmitted to the nut 34, so that the small-diameter screw bar 33 rotates at a considerably high speed. However, the rotation is converted into a relatively slow linear motion of the moving body 33.

When the moving body 33 starts to move in the direction of arrow F as described above, the operating body 42 is pressed by the moving body 31 and moves in the direction of arrow F while compressing and compressing the compression coil spring 43.
When the operating body 42 passes through the “OFF” position and reaches the “RESET” position, the lever 79 of the hysteresis mechanism 73 instantaneously rotates in the direction indicated by the arrow J by the spring force of the toggle tension coil spring 80. In order to press the push button 70a via the leaf spring 77, the micro switch 70 is turned from the contact c-b to the contact c.
It switches to the closing during -a. Then, since the transistor 67 is also turned off off and thyristor 63, a normal rotation circuit K is disconnection, for emitting a reverse rotation signal S ₄ and the transistor 68 is turned on by closing between armature c-a of the microswitch 70 , The transistor 58 is turned on, and the transistor 61 is turned on to turn on the transistor 57.
Is formed, whereby the reversible motor 28 reversely rotates. Therefore, the moving body 31 immediately reverses after moving the operating body 42 to the “RESET” position and moves in the direction indicated by the arrow F. Then, the operating body 42 also moves in the direction indicated by the arrow F so as to follow the movement of the moving body 31. When the operating body 42 reaches the "OFF" position, as shown in FIG. It is locked by the step portion 49a of 49 and stops at the same position.
After that, the moving body 31 continues to move in the direction of the arrow F, but the moving body 31 stops at the “OFF” position, so that the moving body 31
Does not reach the spring force of the compression coil spring 43. Then, the male screw 33a of the small diameter side screw rod 33 and the female screw 34a of the nut 34
The rotation transmission torque based on the frictional force between the nut 34 and the outer race 36 is very small and smaller than the rotation resistance torque of the nut 34 based on the rolling frictional force between the nut 34 and the outer race 36. It will not rotate with respect to 36. When the rotation of the nut 34 stops in this way,
The nut 34 (moving body 31) moves by one pit of the screw per rotation of the small-diameter-side screw rod 33, and the moving body 31 moves at a higher speed than the arrow F when moving in the direction of arrow F. It will move in the direction. And the moving body 31 is the home position HP
Is slightly moved in the direction of the arrow F, the pressing element 31
Since a strongly presses the push button 69a via the leaf spring 72, the micro switch 69 is switched from the closing between the contact pieces c and b to the closing between the contact pieces c and a. Then, since the transistor 68 is turned off, the reverse rotation circuit L is disconnected, and the reversible motor 28 stops.
As a result, the moving body 31 stops at the substantially original position HP as shown in FIGS. When the trip device 17 of the circuit breaker or the breaker 1 is operated and the handle 8 is located at the trip position, the operating body 42 is initially at the "TRIP" position and is separated from the moving body 31. Only, the operation of each member is the same as described above, and when the operating body 42 reaches the “RESET” position, the circuit and the catch 11 of the disconnection 1 are latched.
It is in a state where it can be locked at 15.

Now, with the above mobile body 31 as is returned to the original position HP, by remote control, the input to the ON operation control circuit 66 of the on-command signal S _2, the gate trigger current flows through the thyristor 64. Thus, the thyristor 64 is turned on, as a result, it outputs a reverse rotation signal S ₄ transistor 68 is turned on. This reverse rotation signal S _4, the transistor 58 is turned on, for turning on the transistor 57 the transistor 61 is turned on, reverses the circuit shown by the arrow L in Figure 6 is formed, reversible motor 28 is reverse (mobile 31 is moved in the direction of arrow F in the opposite direction). Then, the moving body 31 moves from the original position HP in the direction indicated by the arrow F while the push button 69a is being pressed by the pressing element 31a via the leaf spring 72, and the release lever 52 is rotated in the direction indicated by the arrow H. . Therefore, the latch lever 49 rotates in the direction opposite to the arrow G against the spring force of the torsion coil spring 51 to release the lock of the operation body 42. Then, the operating body 42 moves at high speed in the direction opposite to the arrow F by the spring force of the compression coil spring 43. As a result, the slider 76 of the hysteresis mechanism 73 is moved in the direction of arrow I by the spring force of the compression coil spring 75, and the tension coil spring for toggle is used.
The lever 79 is instantly rotated in the direction of arrow J by 80 to separate it from the leaf spring 77. Then, the micro switch 70 switches from the contact piece c-a closing to the contact piece c-b closing, so that the transistor 68 is turned off and the thyristor 64 is also turned off. 77 is closed between the contact pieces c and b (at this time, the micro switch 69 is connected to the contact piece c-b
Since the transistor 67 is turned on by being closed) between a emits forward signals S _3, it is formed forward circuit K in the same manner as described above, the reversible motor 28 rotates forward at this. Therefore, the moving body 31 immediately reverses and moves in the direction of arrow F,
Then, when returning to the home position HP, the micro switch
Since 69 switches from closing between the contact pieces c and a to closing between the contact pieces c and b, the reverse rotation circuit L is disconnected in the same manner as described above, and the moving body 31 stops at the original position HP. Therefore, the compression coil spring
The operating tool 42 moved in the direction of the arrow F by the arrow 43 stops at the "ON" position as shown in FIG.

As described above, according to the present embodiment, the rotary motion-linear motion conversion mechanism 32 is configured by the small diameter side threaded rod 33 driven to rotate by the reversible motor 28 and the nut 34 rotatably provided on the moving body 31. Therefore, the relative rotational speed difference between the small-diameter screw rod 33 and the nut 34 can be reduced, so that even when the small-diameter screw rod 33 rotates at a high speed, the moving body 31 can linearly move relatively slowly. Can be. Therefore, there is no need to provide a separate reduction device including a gear train, etc.
24 can be downsized. In this case, if the difference between the diameters of the small side threaded rod 33 and the nut 34 is reduced, a larger reduction ratio can be obtained.As the reversible motor 28, a small motor with small output and high speed rotation can be used. It is possible to further downsize the whole. Moreover, since the rotary motion-linear motion conversion mechanism 32 of the present embodiment can be constituted by the threaded rod 33 and the ball bearing 35 formed with an internal thread on the inner race, it is inexpensive as compared with the conventional one using a ball screw mechanism. Can be configured.

Further, as in the present embodiment, in a configuration in which the movable body 31 returns to the original position HP alone while the operating body 42 is kept at the “OFF” position, when the movable body 31 is returned and moved, the nut 34 is moved.
Since the spring force of the compression coil spring 43 no longer acts on the nut and the nut 34 does not rotate, the moving body 31 can be returned and moved at a high speed. Therefore, after setting the handle 8 in the off position, as on-command signal S ₂ for causing between contacts 4,7 in contact it may be time input, quickly moving body 31 in situ HP In this case, a practically excellent effect of being able to return to the normal state can be obtained.

In the above embodiment, the small-diameter side screw rod 33 is connected to the reversible motor 28.
Although the nut 34 is rotatably provided on the moving body 31, the nut 34 is rotatably driven by the reversible motor 28, and the small-diameter-side screw rod 33 is rotatably provided on the moving body 31. good.

FIG. 8 shows another embodiment of the rotary motion-linear motion conversion mechanism. The difference from the above embodiment is that the mechanism is different from the above embodiment in that a small diameter screw rod 81 and a diameter larger than the small diameter screw rod 81 are used. And a large diameter screw rod 82. For example, the small diameter screw rod 81 is driven to rotate by the reversible motor 28 and the large diameter screw rod 82 is driven.
The moving body 83 is rotatably provided on the moving body 83, and the two screw rods 81 and 82 are screwed together in an intersecting state. Even with such a configuration, a rotational speed difference occurs between the two screw rods 81 and 82, and the moving body 31 can be moved relatively slowly even if the small diameter screw rod 81 rotates at a high speed. The same effects as in the above embodiment can be obtained. In this case, the large diameter screw rod 82 is driven to rotate by the reversible motor 28, and the small diameter screw rod 81 is moved to the moving body 31.
Needless to say, it may be provided so as to be rotatable.

In addition, the present invention is not limited to the embodiment described above and shown in the drawings. For example, the operating body 42 and the compression coil spring 43 are omitted, and a part for operating the handle 8 is provided on the moving body 31 instead. The handle 8 can be rotated in the directions of the arrow E and the counter-arrow E by the reciprocating movement of the moving body 31, and various changes can be made without departing from the scope of the invention. is there.

[Effects of the Invention] As is apparent from the above description, according to the present invention, a rotary motion-linear motion conversion mechanism is provided with a small diameter side threaded rod and an inner or outer diameter larger than the outer diameter of the small diameter side threaded rod. A nut or a large-diameter threaded rod having a female thread or a male thread formed on the inner or outer peripheral surface that is screwed to the male thread of the small-diameter threaded rod. One of the screw rods is rotatably driven by the motor, and the other is rotatably provided on the moving body. Therefore, the rotational motion-linear motion conversion mechanism reduces the high-speed rotation of the motor to make the moving body relatively slow. It is possible to obtain an excellent effect that the motion can be converted into a linear motion, so that a separate reduction gear is not required and the entire device can be reduced in size accordingly.

[Brief description of the drawings]

1 to 7 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional side view of an electric operating device, FIG. 2 is a transverse plan view thereof, and FIG. FIG. 4 is a longitudinal side view of the electric operating device shown in a state different from that of FIG. 1, FIG. 5 is an enlarged plan view of a hysteresis mechanism for operating the microswitch in the state of FIG.
FIG. 6 is an electric circuit configuration diagram of the electric operating device, FIG. 7 is a partial longitudinal side view of a circuit breaker or a breaker, and FIG. 8 is a rotary motion-linear motion conversion mechanism showing another embodiment of the present invention. FIG. In the figure, 1 is a circuit or a breaker, 8 is a handle, 10 is an opening / closing mechanism, 24 is an electric operating device, 28 is a reversible motor, 31 is a moving body,
32 is a rotary motion-linear motion conversion mechanism, 33 is a small diameter side threaded rod,
34 is a nut, 41 is an operating mechanism, 42 is an operating body, 43 is a compression coil spring, 49 is a latch lever, 52 is a release lever, 69 and 70 are micro switches, 73 is a hysteresis mechanism, 76 is a slider, 79 is a lever, 80 is a tension coil spring for toggle, and 83 is a moving body.

Claims (1)

(57) [Claims] 1. A circuit breaker or a breaker provided with a handle for opening and closing between contacts, wherein an electric operating device of the circuit and the breaker for operating the handle includes a motor, A rotary motion-linear motion conversion mechanism for converting the rotation of the motor into a linear motion of the moving body; and an operating mechanism operating the handle based on the linear motion of the mobile body, wherein the rotary motion-linear motion conversion is performed. The mechanism is formed with a small-diameter side threaded rod and an internal or external thread that has an inner diameter or an outer diameter larger than the outer diameter of the small-diameter side threaded rod and that is screwed to the external thread of the small-diameter side threaded rod on the inner or outer peripheral surface. And a nut or a large-diameter side threaded rod, and one of the small-diameter side threaded rod and the nut or the large-diameter side threaded rod is rotationally driven by the motor, and the other is rotatably provided on the moving body. Circuits and breakers electrically driven Work equipment.