Switch and switching mechanism

The present invention relates to a switch and its operation mechanism, and in particular, has the functions of a disconnector and a grounding device, and performs operations in three position states of on (closed), off (open), and grounding with one operating device. It relates to a three-position switch and its operation mechanism.

Like a disconnector with a grounding device, it is configured to have the functions of a disconnector and a grounding device, and one operating device can operate the three position states of on (closed), off (open), and grounded. As an electric operation mechanism (hereinafter, simply referred to as an operation mechanism) of the three-position switch of the above, for example, the operation mechanism shown in Patent Document 1 is known.

In the three-position switch of Patent Document 1, a drive unit is composed of an electric motor, a speed reducer, a gear, and a Geneva gear mechanism, and the blade of the disconnection portion is inserted or cut in the on / off position via a link mechanism or the like by rotation of the output shaft. Rotate to the grounding position. The Geneva driver of the Geneva gear mechanism has a gear part that engages with the gear around it, and consists of an arc part for locking and a drive pin on the side surface, and the Geneva wheel engages the arc part on one side of the main body. It is provided with three circular arc concave surfaces and two grooves in the radial direction through which the pins provided between the concave surfaces can enter and exit.

In the three-position switch of Patent Document 1, at the cut position, the arc portion of the Geneva driver engages with the arc concave surface of the Geneva wheel to lock the Geneva wheel, and the blade is in the cut position. In this state, when the electric motor is started for the on-operation, the Geneva driver is rotated by the gears. When the pin reaches the position where it engages the groove, the Geneva wheel starts rotating, and the link mechanism and blade operate. When the Geneva driver further rotates, the pin separates from the groove, the arc portion engages with the arc concave surface, and the Geneva wheel stops. Further, the operation from the off position to the grounding position is performed in the completely opposite manner to the above-mentioned operation.

Further, Patent Document 2 also discloses an operation mechanism of a three-position switch. In this case, the worm is attached to the spindle connected to the electric motor, and power is transmitted via the worm wheel.<patcit num="1"><text>Japanese Patent Application Laid-Open No. 3-133018</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 2000-285768</text></patcit>

<p> The operation mechanism of the three-position switch shown in Patent Document 1 has the following problems (1) to (4).</p><p> (1) Since the rotation angle of the output shaft is limited to less than 360 degrees, it is difficult to apply it to an operation mechanism having contacts driven by multiple rotations.</p><p> (2) In order to make the output of the conventional operation mechanism compatible with multiple rotations, it is necessary to further provide a speed-increasing mechanism on the output shaft, which increases the number of gear trains, lowers the power transmission efficiency, and further increases the cost.</p><p> (3) In automatic operation, if the switch that detects the on / off / grounding position and turns the motor on or off fails, for example, there is a risk of passing through the on / off position and moving to the grounding position. A device for mechanically preventing such a failure operation cannot be installed in the operation mechanism.</p><p> (4) In the case of manual operation, it is difficult for the operator to detect the cut position with the conventional operation mechanism, and there is a risk that, for example, the operator passes through the cut position from the on position and operates to the grounding position. In addition, it is difficult to detect the entry position and the ground contact position, and the pin is operated until it comes into contact with the outer circumference of the Geneva wheel, which may cause an excessive force acting on the pin and cause a failure.</p><p> Further, in the operation mechanism of the three-position switch shown in Patent Document 2, since the worm is attached to the main shaft connected to the electric motor and the power is transmitted via the worm wheel, these rotating shafts are not parallel to each other. It may be difficult to reduce the size.</p><p> The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to be small, simple, applicable to a contact portion requiring multi-rotation output, and to be automatically operated. It is also an object of the present invention to provide a three-position switch operation mechanism for preventing malfunction during manual operation and a switch using the three-position switch operation mechanism.</p>

<p> In order to achieve the above object, the switch operating mechanism according to the present invention switches the switch by moving the movable terminal of the switch having the functions of the breaker and the grounding device, so that the switch is turned on mainly in the off state. In the switch operation mechanism that can be used for a switch that can be arbitrarily shifted to the grounded state, a spindle that transmits a driving force to a movable terminal of the switch, a small gear fixed around the spindle, and the spindle An operation shaft arranged substantially in parallel, a large gear fixed to the operation shaft, engaged with the small gear, and having a protruding portion protruding in the axial direction at the end face, and a large gear arranged substantially parallel to the operation shaft. The catch shaft and the two catch levers that are rotatably arranged on the catch shaft and the catch lever are engaged with and disengaged from each other by engaging and disengaging with the protruding portion and holding the protruding portion at three positions. A latch pin having a semi-cylindrical portion that locks freely, a latch lever fitted to the latch pin, and the latch lever are rotated in one direction to release the lock of the catch lever by the semi-cylindrical portion. It is characterized by having a trip coil and a stopper block that determines a rotation angle range of the large gear by engaging with the protruding portion of the large gear.</p><p> Further, the switch according to the present invention is a switch having a movable terminal capable of arbitrarily shifting to an on state and a ground state centering on an off state, and an operation mechanism for driving the movable terminal. Is a main shaft that transmits a driving force to the movable terminal, a small gear fixed around the main shaft, an operation shaft arranged substantially parallel to the main shaft, and the small gear fixed to the operation shaft. A large gear that engages and has a protruding portion that protrudes in the axial direction at the end face, a catch shaft that is arranged substantially parallel to the operating shaft, and a catch shaft that is engaged with and disengaged from the protruding portion to engage and disengage the protruding portion. Two catch levers held at one position and rotatably arranged on the catch shaft, a latch pin having a semi-cylindrical portion that engages and disengages with the catch lever, and are fitted to the latch pin. Rotation of the large gear by engaging the latch lever, the trip coil that rotates the latch lever in one direction to release the lock of the catch lever by the semi-cylindrical portion, and the protruding portion of the large gear. It is characterized by having a stopper block for determining an angle range.</p>

<p> According to the present invention, it is possible to provide a compact, simple, three-position switch operation mechanism that prevents malfunctions and is inexpensive, and a switch that utilizes the three-position switch operation mechanism.</p>

[First Embodiment]

[Constitution]

1 to 8 are diagrams showing a switch operation mechanism (hereinafter, abbreviated as an operation mechanism) according to the first embodiment of the present invention, and FIG. 1 is a diagram showing AA among the operation mechanisms shown in FIG. It is a cross-sectional view taken along the line. FIG. 3 is a cross-sectional view taken along the line BB among the operating mechanisms shown in FIG. FIG. 4 is an exploded view showing the periphery of the shutter plate as viewed from the direction of the arrow on the CC line among the operation mechanisms shown in FIG. FIG. 5 is a side view of FIG. FIG. 6 is an exploded view showing the groove cam and the periphery of the auxiliary switch as viewed from the direction of the CC line arrow among the operation mechanisms shown in FIG. FIG. 7 is an exploded view showing the groove cam and the periphery of the display plate as viewed from the direction of the arrow on the CC line among the operation mechanisms shown in FIG. FIG. 8 is an exploded view showing the periphery of the large gear and the stopper block seen from the direction of the arrow on the AA line among the operation mechanisms shown in FIG. 2, and shows the ground contact state.

Fig. 1, Fig. 2 and Fig. 3 show the off state of the operation mechanism. In FIG. 2, the operation mechanism first includes an electric motor 1 that supplies a driving force and a speed reducer 2 that transmits the driving force of the electric motor 1. The speed reducer 2 has an integral structure with the electric motor 1, and a spindle 13 is fitted in the final stage of the speed reducer 2. A small gear 14 is fitted around the spindle 13, and a driving force is transmitted to an operating shaft 15 arranged substantially horizontally on the spindle 13 and a large gear 16 fitted on the operating shaft 15.

A protrusion 17 is arranged on the side surface of the large gear 16 and engages with the protrusions of the catch levers 19a and 19b arranged freely around the catch shaft 18 arranged substantially parallel to the operation shaft 15. To do. That is, as shown in FIG. 1, the protruding portion 17 is restrained so as to be sandwiched between the protruding portions 19a'and 19b'of the catch levers 19a and 19b in the off state, and the catch levers 19a and 19b are the latch pins 20a and 20b, respectively. It is locked by the semi-cylindrical portions 20a'and 20b'. Further, the catch levers 19a and 19b are given a rotational force in the direction of releasing the locking at the semi-cylindrical portions 20a'and 20b'by the torsion spring 21.

The small gear 14, the large gear 16, the catch levers 19a and 19b, the torsion spring 21, etc. are arranged between the support plates 22a and 22b as shown in FIG. 2, and the stopper block 23 is fitted to the support plate 22b. Has been done.

As shown in FIG. 3, latch levers 24a and 24b are fitted on the latch pins 20a and 20b, respectively, and the tips of the plungers 26a and 26b of the trip coils 25a and 25b are part of the latch levers 24a and 24b. It is fitted to the support plate 22b so as to engage. Limit switches 27a and 27b are fitted to the support plate 22b, and the latch levers 24a and 24b are rotated to conduct conduction, and the electric motor 1 is started or stopped. Torsion springs 24c and 24d are attached to the latch levers 24a and 24b, respectively, and serve to return the positions of the latch levers 24a and 24b.

In FIG. 2, the manual operation shaft 28 is fitted coaxially with the main shaft 13, and an insertion hole 28a having a polygonal cross section for inserting a manual handle 29 and transmitting a manual force is arranged at the end of the manual operation shaft 28. Has been done. Further, a torque limiter 30 for preventing excessive torque from being transmitted from the manual handle 29 to the main shaft 13 is fitted on the manual operation shaft 28.

The surface plate 31 is arranged substantially perpendicular to the manual operation shaft 28, and the handle insertion hole 31a is located approximately in the center of the surface plate 31. A shutter plate 32 that is slidable with respect to the surface plate 31 is arranged on the manual operation shaft 28 side of the surface plate 31, and a switching lever 32a for sliding and positioning the shutter plate 32 is provided on the shutter plate 32. It has been pivoted. Further, the shutter plate 32 is provided with shutter holes 32b and 32c for disconnecting operation and grounding operation. Further, a protrusion 32d is arranged on the shutter plate 32, and the plunger 47a of the electromagnetic device 47 is arranged so as to be engaged and disengaged.

In FIGS. 4 and 5, a switching lever 32a is inserted into the surface plate 31, and a groove 31c for switching between automatic operation, disconnecting operation, and grounding operation is arranged.

In the push-pull cable 33 of FIGS. 2 and 3, the side surface of the shutter plate 32 and the pin 33a arranged at one end of the push-pull cable 33 are engaged, and the pin 33b arranged at the other end of the push-pull cable 33 is a plunger. Arranged to engage with 26a. Similarly, in the push-pull cable 34, the side surface of the shutter plate 32 and the pin 34a arranged at one end of the push-pull cable 34 are engaged, and the pin 34b arranged at the other end of the push-pull cable 34 is engaged with the plunger 26b. Arranged like this.

In FIGS. 2 and 6, the auxiliary switch switching groove cam 35 is fitted to the operation shaft 15, and one end of the auxiliary switch switching cam driven portions 35a and 35b is engaged with the auxiliary switch switching groove cam 35. The other end is pivotally attached to the auxiliary switches 36a and 36b by the link lever mechanisms 37a and 37b. The groove cam 35 for switching the auxiliary switch is composed of three concentric grooves 35c, 35d, 35e having different radii and arc grooves 35f, 35g that smoothly connect them. The protruding portions 35a'and 35b'of the auxiliary switch switching cam driven portions 35a and 35b are engaged with the concentric grooves 35c, 35d and 35e and the arc grooves 35f and 35g.

In FIGS. 2 and 7, the display switching groove cam 38 is fitted to the operation shaft 15, one end of the display switching cam driven portion 38a is engaged with the display switching groove cam 38, and the other end is It is pivotally attached to the display board 39 by the link lever mechanism 40. The display switching groove cam 38 is composed of two concentric grooves 38b and 38c and an arc groove that smoothly connects them. The protrusions 38a'of the display switching cam driven portion 38a are engaged with the grooves 38b, 38c and the like. On, off, and grounding display characters are arranged on the display board 39 at substantially equal intervals, and the surface plate 41 is arranged so as to cover the display board 39. A viewing window 41a is arranged on the surface plate 41 so that the display characters for entering, turning off, and grounding can be confirmed from the viewing window 41a.

In FIG. 2, one end of the connecting shaft 42 is fitted to the spindle 13, and the pinion 43a is fitted to the other end. The rack 43b that engages with the pinion 43a is fitted to the movable terminal 44. The movable terminal 44 engages with the inlet side fixed terminal 45 and the ground side fixed terminal 46 by the rotation of the pinion 43a.

FIG. 8 shows an internal sectional view of the stopper block 23. Inside the stopper block 23, the elastic body 23a and contact portions 23b and 23c are arranged at both ends of the elastic body 23a. The contact portions 23b and 23c are housed in a hole 23d having a step so as not to pop out from the inside of the stopper block 23, and engage with the protruding portion 17 in the grounded state and the closed state. The elastic body 23a relaxes the impact force generated when the protruding portion 17 engages with the contact portion 23b or 23c, and also has the effect of pushing the protruding portion 17 toward the catch lever 19a or 19b with a certain force.

[Action]

Next, the grounding operation by the electric motor and the manually grounding operation of the operation mechanism configured as described above will be described with reference to FIGS. 1 to 16. FIG. 9 is a diagram corresponding to FIG. 3, showing a state in which the trip coil 25a is excited. FIG. 10 is a diagram corresponding to FIG. 1, and is a diagram showing a grounding operation or an operation in the middle of the operation from the grounding to the off state. FIG. 11 is a diagram corresponding to FIG. 1 and shows a grounded state. FIG. 12 is a diagram corresponding to FIGS. 4 and 9, and shows a state after the shutter plate 32 is moved. FIG. 13 is a diagram corresponding to FIG. 6, and is a diagram showing a grounding operation or an operation in the middle of the operation from the grounding to the off state. FIG. 14 is a diagram corresponding to FIG. 6 and shows a grounded state. FIG. 15 is a diagram corresponding to FIG. 7, and is a diagram showing a grounding operation or an operation in the middle of the operation from the grounding to the off state. FIG. 16 is a diagram corresponding to FIG. 7, and shows a grounded state.

[Grounding operation by electric motor]

First, the operation of bringing the movable terminal 44 shown in FIG. 2 into contact with the ground-side fixed terminal 46 will be described.

In FIG. 3, the trip coil 25a is excited by a command from a control device (not shown), and the plunger 26a moves to the left. As the plunger 26a moves, the tip of the plunger 26a engages with the latch lever 24a, and the latch lever 24a rotates clockwise around the latch pin 20a. Further, the latch lever 24a engages with the limit switch lever 27c of the limit switch 27a for starting the motor 1, and the motor 1 starts to rotate. This state is shown in FIG. At this time, since the latch lever 24a of the catch lever 19a is rotated clockwise from the state shown in FIG. 1, the latch pin 20a is also rotated clockwise, and the semi-cylindrical portion 20a'and the catch lever 19a are projected. The engagement with the part 19c is disengaged.

Since the electric motor 1 is activated at this point as described above, the rotation of the electric motor 1 is transmitted to the large gear 16 via the small gear 14, and the protrusion 17 is centered on the operation shaft 15 as shown in FIG. Rotate counterclockwise. Since the movable terminal 44 operates in conjunction with the small gear 14, it approaches the ground side fixed terminal 46 side. At this time, the contact state between the protrusion 17 and the catch lever 19a is maintained by the force of the torsion spring 21. In addition, the excitation of the trip coil 25a is released when the motor 1 is started by the command of the control device, and the latch pin 20a tries to rotate counterclockwise by the force of the torsion spring 24c, but the semi-cylindrical portion 20a'and the catch lever Since the arcuate portion 19d of 19a is engaged, the engagement between the limit switch lever 27c and the latch lever 24a is not disengaged, and the motor 1 continues to rotate and is in the state shown in FIG.

In FIG. 11, the movable terminal 44 of FIG. 2 is in contact with the ground-side fixed terminal 46, the protruding portion 17 engages with the stopper block 23, and the protruding portion 19e of the catch lever 19a becomes the protruding portion 17. Engage, followed by the semi-cylindrical portion 20a'and the protruding portion 19c. In this state, the latch lever 24a rotates counterclockwise and the limit switch 27a is turned off, so that the rotation of the motor 1 is stopped and the grounding operation by the motor 1 is completed.

The operation of the groove cam 35 for switching the auxiliary switch and the auxiliary switches 36a and 36b shown in FIGS. 2 and 6 during the grounding operation will be described. FIG. 6 shows the off state, and when the grounding operation is started, the auxiliary switch switching groove cam 35 starts rotating counterclockwise around the operation shaft 15. Then, the protruding portion 35a'of the auxiliary switch switching cam driven portion 35a moves according to the arc grooves 35f (range of θ1) and 35d (range of θ2). However, the auxiliary switch switching cam driven portion 35b does not move because the engaging groove is a concentric groove 35e. This state is shown in FIG. The link lever mechanism 37a of the auxiliary switch 36a rotates due to the movement of the auxiliary switch switching cam driven portion 35a, and the auxiliary switch 36a changes from the ON state to the OFF state only when the state shown in FIG. 13 is reached. That is, if there is a protrusion 35a'in the arc groove 35f in the range of θ1 shown in FIG. 6, the auxiliary switch 36a is in the ON state. Furthermore, if it is in the range of θ2 and θ3, it will be in the OFF state. Figure 14 shows the area around the auxiliary switch switching groove cam 35 and the auxiliary switch 36a at the end of the grounding operation.

The operation of the display switching groove cam 38 and the display board 39 shown in FIGS. 2 and 7 during the grounding operation will be described. FIG. 7 shows the off state, and when the grounding operation is started, the display switching groove cam 38 starts rotating counterclockwise around the operation shaft 15. Then, the protruding portion 38a'of the display switching cam driven portion 38a moves according to the arc groove 38c, the display switching cam driven portion 38a also moves, and the display plate 39 rotates via the link lever mechanism 40. This state is shown in FIG. In the state of FIG. 15, since the movable terminal 44 has not yet come into contact with the ground-side fixed terminal 46, the display characters of "off" and "ground" cannot be seen from the viewing window 41a. Further, when the grounding operation progresses and the movable terminal 44 comes into contact with the grounding side fixed terminal 46, the display switching cam driven portion 38a moves until the display character of "grounding" can be seen from the viewing window 41a. FIG. 16 shows an exploded view of the vicinity of the groove cam 38 at the end of the grounding operation.

[Off operation from the grounded state by the electric motor]

The operation from the grounded state to the off state by the electric motor 1 will be described. Since this operation is performed by almost the same procedure as the above-mentioned operation, only the different parts will be described.

First, in the grounded state, as shown in FIG. 11, the protruding portion 17 is restrained between the protruding portion 19e of the catch lever 19a and the stopper block 23. From this state, the trip coil 25a is excited in the same manner as the grounding operation, the electric motor 1 starts rotating in the direction opposite to the grounding operation, and drives the movable terminal 44. Along with this, the protruding portion 17 shifts from the state shown in FIG. 11 to the state shown in FIG. 1, engages with the catch levers 19a and 19b, and the cutting operation ends.

[On / off operation by electric motor]

Since the on-and-off operation by the electric motor 1 can be more easily estimated than the above-mentioned grounding operation and off-ground operation, the description thereof will be omitted.

[Manual grounding operation]

The operation of manually driving the movable terminal 44 from the off state shown in FIG. 2 and bringing it into contact with the ground-side fixed terminal 46 will be described.

In order to enable manual operation, the electromagnetic device 47 shown in FIG. 2 is excited by a control command unit (not shown), and the plunger 47a and the protrusion 32d are disengaged. The operator moves the switching lever 32a shown in FIG. 4 to the grounding operation position 31b in order to insert the manual handle 29 shown in FIG. 2 into the insertion hole 28a. At this time, a part of the shutter plate 32 and the pin 33a of the push-pull cable 33 are engaged, the other pin 33b is engaged with the plunger 26a, and the catch lever 19a is in a rotatable state. This state is shown in FIG. In the state shown in FIG. 12, the handle insertion hole 31a and the shutter hole 32c overlap each other, and the manual handle 29 can be inserted into the insertion hole 28a. The description is omitted because it is almost the same as the grounding operation by the electric motor 1 described above except that the spindle 13 is rotated by the manual handle 29.

Further, the explanation of the manual turning operation and the on / off operation from the grounded state can be easily inferred from the operation explanation by the motor 1 and the manual grounding operation explanation, and thus the description is omitted.

[effect]

According to the operation mechanism according to the first embodiment described above, the following effects can be obtained.

(1) Since the reduction ratio of the small gear 14 and the large gear 16 can be freely selected, it can be applied to the contacts that require multi-rotation drive as shown in FIG. In addition, there is no addition of new parts for that purpose, so the cost does not increase.

(2) In the case of automatic operation, even if the switch that turns the motor on or off fails, the catch lever and stopper block forcibly stop the rotation of the motor, so there is no malfunction from the on position to the grounding position.

(3) In the case of manual operation, the rotation of the large gear is forcibly stopped by the catch lever and the stopper block, so that it can always be stopped at three positions, and malfunction can be prevented.

(4) During automatic operation, the electromagnetic device and the protruding part of the shutter are always engaged, and the insertion of the manual handle can be prohibited. At the time of manual operation, the electromagnetic device is excited by an external command, the engagement with the protruding portion is released, and the shutter plate can be moved. As a result, the operator cannot accidentally insert the manual handle into the handle insertion hole during automatic operation, so that erroneous operation can be prevented.

(5) When the operator applies excessive torque to the manual handle, the torque limiter can cut off the torque transmission and prevent damage to each part of the operating mechanism.

(6) The impact force when the protruding part contacts the stopper block is relaxed by the contact part and the elastic body. As a result, the force acting on each part of the operating mechanism can be relaxed, so that the parts can be prevented from being destroyed.

(7) Since the auxiliary switch that has been used conventionally is used to discriminate between on / off of disconnection operation and grounding / off of grounding operation, reliability comparable to that of conventional operation can be obtained, and high accuracy is required for positioning. Since it is not necessary to newly use the auxiliary switch for three positions, malfunction can be prevented.

(8) In the case of manual operation Rather than the display board rotating gradually with the rotation of the operation shaft, the display board rotates as the movable contact reaches the off position, the on position, and the ground contact position, so the operator Can prevent the manual operation from stopping in the middle.

[Second Embodiment]

[Constitution]

17 to 20 are block diagrams showing a switch operation mechanism according to a second embodiment of the present invention. Since the operation mechanism according to the present embodiment is nothing but an improved part of the configuration of the operation mechanism according to the first embodiment described above, only this improved part will be described below. Note that FIG. 17 shows a configuration diagram of an operation mechanism corresponding to FIG. 2, and shows a off state. Further, FIG. 18 shows only the part related to the manual operation of FIG. 17, and shows the state in which the manual handle 29 is attached. FIG. 19 shows an exploded view of the operation axis around the operation axis as seen from the direction of the CC line arrow in FIG.

In the present embodiment, the surface plate 31, the shutter plate 32, and the electromagnetic device 47 in the first embodiment are deleted as means for inserting the manual handle 29 and transmitting the manual force. Then, instead, the first drive shaft having the manually operated shaft gear 50 fitted to the manually operated shaft 28, the first drive shaft gear 51a engaged with the manually operated shaft gear 50, and the insertion hole 51b of the manual handle 29. 51 is arranged, and the second drive shaft 53 that rotates synchronously with the first drive shaft is arranged by the power transmission means 52. An insertion hole 53a is arranged in the second drive shaft 53. The first drive shaft 51 and the second drive shaft 53 are arranged at opposite positions with the operation shaft 15 in between, but are not arranged equidistant from the operation shaft 15.

Further, as shown in FIG. 18, when the manual handle 29 is inserted into the insertion hole 53a, the lever 54 is arranged at a position where it engages with the cylindrical portion 29a of the manual handle 29. The pin 33a of the push-pull cable 33 is pivotally attached to this lever 54, and the pin 33a moves as the lever 54 rotates. A pin 33b is arranged at the other end of the push-pull cable 33 as in the first embodiment. Further, a lever 55 is arranged around the first drive shaft 51, a pin 34a is pivotally attached, and the other configurations are the same as those of the first embodiment.

A shutter disk 56 is fitted to one end of the operation shaft 15, and as shown in FIG. 19, a first insertion groove 56a and a second insertion groove 56b are arranged in the shutter disk 56. The first insertion groove 56a is used when the manual handle 29 is inserted into the insertion hole 51b, and the second insertion groove 56b is used when the manual handle 29 is inserted into the insertion hole 53a.

The first insertion groove 56a and the second insertion groove 56b are composed of concentric grooves 56c and 56d having different radii centered on the operation shaft 15, and circular insertion holes 56e and 56f are formed at both ends of the first insertion groove 56a. have. Further, the second insertion groove 56b has circular insertion holes 56g and 56h at both ends. The groove widths of the concentric grooves 56c and 56d are smaller than the diameter of the cylindrical portion 29a of the manual handle 29 and larger than the diameter of the stepped portion 29b. The diameters of the circular insertion holes 56e, 56f, 56g, and 56h are larger than the diameter of the cylindrical portion 29a. That is, the structure is such that the manual handle 29 cannot be pulled out when the step portion 29b enters the concentric grooves 56c and 56d.

[Electric motor on / off and grounding]

Since the on / off operation and the grounding operation by the electric motor 1 are exactly the same as the operations described in the first embodiment, the description thereof will be omitted.

[Manual grounding operation]

The operation of manually driving the movable terminal 44 from the off state shown in FIG. 17 and bringing it into contact with the ground-side fixed terminal 46 will be described. However, the description of the same operation part as the manual grounding operation described in the first embodiment will be omitted.

First, the worker inserts the manual handle 29 shown in FIG. 17 into the insertion hole 53a through the circular insertion hole 56g of the second insertion groove 56b shown in FIG. When inserted, a part of the cylindrical portion 29a of the manual handle 29 engages with a part of the lever 54, and the lever 54 rotates. Then, the pin 33a pivotally attached to the lever 54 moves upward in FIG. 18, and the pin 33b at the other end engages with the plunger 26a. This state is shown in FIG.

In the state of FIG. 18, as described in the first embodiment, the catch lever 19a becomes rotatable, and when the manual handle 29 is rotated counterclockwise, the power transmission means 52 is transmitted from the second drive shaft 53. And the spindle 13 and the large gear 16 rotate via the first drive shaft 51. Further, the movable terminal 44 moves in the direction of the ground side fixed terminal 46. At this time, the shutter disk 56 rotates counterclockwise with the operation shaft 15 and the stepped portion 29b of the manual handle 29 enters the concentric groove 56d. Therefore, the manual handle 29 must be pulled out until the manual grounding operation is completed. I can't.

When the grounding operation is completed, as described in the first embodiment, the rotation of the large gear 16 is restricted, so that the operator can confirm that the grounding operation is completed, and further, the circular insertion hole 56h is formed. Since it is rotated to the position of the second drive shaft 53, the manual handle 29 can be pulled out. FIG. 20 shows the periphery of the shutter disk 56 in this grounded state. In FIG. 20, since the insertion hole 51b is partially blocked by the concentric groove 56d, the manual handle 29 cannot be inserted into the insertion hole 51b for the on / off operation in the grounded state.

The explanation of the manual grounding operation from the grounded state and the on / off operation will be omitted because it can be easily inferred from the manual grounding operation explanation.

[effect]

According to the operation mechanism according to the present embodiment, in the case of manual operation, the rotation of the large gear is forcibly stopped by the catch lever and the stopper block, so that the operation can be stopped at three positions without fail, and malfunction can be prevented. In addition, since the manual handle is not pulled out during the manual operation, it is possible to prevent the intermediate stop of the movable contact, and two drive shafts are prepared by the manual handle, and the insertion position of the manual handle is restricted by the shutter disk. It is not possible to perform the disconnection / disconnection operation in.

[Third Embodiment]

FIG. 21 is an exploded view showing only the catch levers 19a and 19b, the small gear 14 and the large gear 16 in the switch operation mechanism according to the second embodiment of the present invention, and shows the off state. The operation mechanism according to this embodiment basically has the same configuration as the operation mechanism according to the first embodiment described above, and the two catch levers 19a and 19b are connected to the catch shaft 18a parallel to each other. , 18b are characterized by the structure supported by each.

In the third embodiment shown in FIG. 21, the catch lever 19a is pivotally attached to the catch shaft 18a and receives a counterclockwise force by the torsion spring 21a. The catch lever 19b is pivotally attached to the catch shaft 18b and receives a clockwise force by the torsion spring 21b. The protrusion 17 is sandwiched between two catch levers 19a and 19b.

In FIG. 21, the operation of the catch lever 19a and the protrusion 17 in the ground contact operation is as described in the first embodiment.

As described above, in the third embodiment, since the support structures of the two catch levers 19a and 19b are supported by their own catch shafts 18a and 18b, respectively, the catch levers 19a and 19b do not overlap each other and have a structure. Since the operation of each other does not affect the catch lever of the other, the operation reliability of the operation mechanism can be improved and the production can be performed at a lower cost.

[Fourth Embodiment]

FIG. 22 shows only the shutter plate 32 and the trip coil 25a of the operation mechanism to which the invention according to claim 4 is applied, and the mechanism portion related to these operations, as the fourth embodiment of the present invention. It is a figure. The operation mechanism according to this embodiment basically has the same configuration as the operation mechanism according to the first embodiment described above, and the plunger 26a of the trip coil 25a is operated by the operation of the shutter plate 32. It has a characteristic structure.

In the third embodiment shown in FIG. 22, the lever 57 is arranged at a position where it engages with a part of the shutter plate 32 as the shutter plate 32 moves, and the lever 57 is further supported by the shaft 58. A lever 59 is fitted to the other end of the shaft 58, and is arranged so as to engage with the plunger 26a as it rotates.

In FIG. 22, as described in the manual grounding operation in the first embodiment, when the operator moves the shutter plate 32 to the right, the shutter plate 32 engages with the lever 57, and the lever 57 engages with the shaft 58. Rotates counterclockwise around the center of. Along with the rotation, the lever 59 engages with the plunger 26a and moves the plunger 26a to the left. By this operation, the catch lever 19a can be rotated, and the grounding operation can be started. Other operations are as described in the first embodiment.

As described above, in the fourth embodiment, since the operation of the shutter plate can be transmitted to the plunger by using a lever mechanism having a simple configuration, the operation reliability of the operation mechanism can be improved. It can be manufactured at a lower cost.

<figref num="1">It is a figure which shows the off state of the operation mechanism which concerns on 1st Embodiment of this invention, and is the cross-sectional view taken along the line AA of FIG.</figref><figref num="2">The front view which shows the off state of the operation mechanism of FIG.</figref><figref num="3">FIG. 2 is a cross-sectional view taken along the line BB showing the off state of the operation mechanism shown in FIG.</figref><figref num="4">A partially enlarged view showing the periphery of the shutter plate as seen from the direction of the arrow on the CC line showing the off state of the operation mechanism of FIG.</figref><figref num="5">A side view showing the periphery of the shutter plate of FIG.</figref><figref num="6">A partially enlarged view showing the groove cam and the periphery of the auxiliary switch as seen from the direction of the arrow on the CC line in the off state of the operation mechanism in FIG.</figref><figref num="7">A partially enlarged view showing the groove cam and the periphery of the display board as seen from the direction of the arrow on the CC line in the off state of the operation mechanism of FIG.</figref><figref num="8">A partially enlarged view showing the area around the large gear and the stopper block as seen from the direction of the arrow on the AA line in the off state of the operation mechanism in FIG.</figref><figref num="9">The figure which shows after trip coil excitation of the part corresponding to FIG.</figref><figref num="10">The figure which shows the grounding operation of the part corresponding to FIG. 1 or the operation middle from the grounding to the off state.</figref><figref num="11">The figure which shows the grounding state of the part corresponding to FIG.</figref><figref num="12">Schematic diagram showing the parts corresponding to FIGS. 4 and 9 in manual operation in association with each other.</figref><figref num="13">The figure which shows the grounding operation of the part corresponding to FIG.</figref><figref num="14">The figure which shows after the grounding operation of the part corresponding to FIG.</figref><figref num="15">The figure which shows the grounding operation of the part corresponding to FIG. 7 or the operation process from the grounding to the off state.</figref><figref num="16">The figure which shows after the grounding operation of the part corresponding to FIG. 7 is completed.</figref><figref num="17">The front view which shows the off state of the operation mechanism which concerns on 2nd Embodiment of this invention.</figref><figref num="18">Partial enlarged view of the part related to the manual operation of the operation mechanism of FIG.</figref><figref num="19">A partially enlarged view showing the periphery of the insertion plate as seen from the direction of the CC line arrow of the operation mechanism of FIG.</figref><figref num="20">The figure which shows after the grounding operation of the part corresponding to FIG. 17 is completed.</figref><figref num="21">The figure which shows the off state of the operation mechanism which concerns on 3rd Embodiment of this invention.</figref><figref num="22">The partial figure which shows the off state of the operation mechanism which concerns on 4th Embodiment of this invention.</figref>

Code description

1 ... Electric motor 2 ... Reducer 13 ... Spindle 14 ... Small gear 15 ... Operating shaft 16 ... Large gear 17 ... Protruding parts 18, 18a, 18b ... Catch shaft 19a, 19b ... Catch lever 19a', 19b', 19c, 19e ... Protruding part 19d ... Arc-shaped part 20a, 20b ... Latch pin 20a', 20b' ... Semi-cylindrical part 21, 21a, 21b ... Twisting spring 22a, 22b ... Support plate 23 ... Stopper block 23a ... Elastic body 23b, 23c ... Contact part 23d ... Hole 24a, 24b ... Latch lever 24c , 24d ... Twisting spring 25a, 25b ... Trip coil 26a, 26b ... Plunger 27a, 27b ... Limit switch 27c ... Limit switch lever 28 ... Manual operation shaft 28a ... Insertion hole 29 ... Manual handle 29a ... Cylindrical part 29b ... Step part 30 ... Torque limiter 31 ... Surface plate 31a ... Handle insertion hole 31b ... Grounding operation position 31c ... Groove 32 ... Shutter plate 32a ... Switching lever 32b, 32c ... Shutter hole 32d .. .Protrusion 33 ... Push-pull cable 33a, 33b ... Pin 34 ... Push-pull cable 34a, 34b ... Pin 35 ... Auxiliary switch switching groove cam 35a, 35b ... Auxiliary switch switching Cam driven part 35c, 35d, 35e ... Concentric groove 35f, 35g ... Arc groove 35a', 35b' ... Protruding part 36a, 36b ... Auxiliary switch 37a, 37b ... Link lever mechanism 38 ... Display switching groove cam 38a ... Display switching cam driven part 38a'... Protruding parts 38b, 38c ... Groove 39 ... Display board 40 ... Link lever mechanism 41 .. .Surface plate 41a ... Peephole 42 ... Connecting shaft 43a ... Pinion 43b ... Rack 44 ... Movable terminal 45 ... Input side fixed terminal 46 ... Ground side fixed terminal 47 ... Electromagnetic device 47a ... Plunger 50 ... Manual operation shaft gear 51 .. .1st drive shaft 51a ... 1st drive shaft gear 51b ... Insert hole 52 ... Power transmission means 53 ... 2nd drive shaft 53a ... Insert hole 54 ... Lever 55 ... Lever 56 ... Shutter disk 56a ... 1st insertion groove 56b ... 2nd insertion groove 56c, 56d ... Concentric groove 56e, 56f, 56g, 56h ... Circular insertion hole 57, 59. .. Lever 58 ... Shaft