JP3294464B2 - Circuit breaker operating device and vacuum circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker operating device, and more particularly to a circuit breaker operating device which is particularly suitable for operating a vacuum circuit breaker and which can absorb the mechanical energy of a contact at the time of opening. The present invention relates to a vacuum circuit breaker.

[0002]

2. Description of the Related Art FIGS. 14 to 17 show a vacuum circuit breaker used up to now, FIGS. 14 and 15 show an open state of the vacuum circuit breaker, and FIGS. 16 and 17 show a closed state. The state is shown. In these figures, the vacuum circuit breaker includes a casing 1 which is an outer box, and a vacuum switch 4 provided in the casing 1 and having a fixed contact 2 and a movable contact 3 which can be separated from each other. ing. The vacuum switch 4 is fixed to the casing 1 by terminals 5 and 6. The terminal 6 has a flexible conductor 7 so that the movable contact 3 can move toward and away from the fixed contact 2. The vacuum circuit breaker further has an operation shaft 8 which is a crossbar and has a vacuum switch 4 according to a closing command or a trip command.
And a circuit breaker operating device 10 that connects the operating shaft 8 to the vacuum switch 4 to open and close the vacuum switch 4. Circuit breaker operating device 10
Is provided with an operation lever 11 and a contact drive device 12. The operation lever 11 is fixed to the operation shaft 8 and
The lever is configured to swing to the open position (FIG. 14) or the closed position (FIG. 16) to open or close the contacts 2 and 3. A contact pressure spring 13 for applying a contact pressure between the contacts when in the position, and in combination with the operation lever 11,
The movement of the operation lever 11 is transmitted to the contacts 2 and 3 of the switch 4 to open and close the contacts.

The operating mechanism 9 is provided with a charging device, a trip device (not shown), and the like in order to perform various operations of the vacuum circuit breaker. The operation shaft 8 of the operation mechanism 9 swings to the open position (FIG. 14) or the closed position (FIG. 16) by the rotation of the operation shaft 8 to move the movable contact 3 of the vacuum switch 4 to the open position (FIG. 16). 14) or an operation lever 11 to be driven to the closed position (FIG. 16). The tip of the operating lever 11 is an operating rod 14 fixed to the movable contact 3.
Are slidably mounted on a bracket 15 by pins 16. An insulating flange 17 is fixed to the other end of the operating rod 14.
A contact pressure spring 13 for applying a contact pressure between the contacts 2 and 3 when the operation lever 8 is in the closed position shown in FIG. .

The operating shaft 8 is further provided with a damper lever 18. When the operating shaft 8 is at the position shown in FIG. 14, an oil damper 19 serving as a shock absorber and a stopper 2 are provided.
0, so that the operation shaft 8 and the operation lever 11 cannot be rotated further clockwise than this position.

When a closing command is given to the operating mechanism 9 when such a vacuum circuit breaker is in the opening position shown in FIG. 14, the operating mechanism 9 causes the operating shaft 8 together with the operating lever 11 to rotate counterclockwise in FIG. Is turned to the bracket 1
5, contact pressure spring 13, flange 17 and operation rod 14
The movable contact 3 of the vacuum switch 4 is moved upward through.
The movable contact 3 eventually comes into contact with the fixed contact 2 and cannot move any further, but the operation lever 8 continues to rotate counterclockwise and pushes the bracket 15 upward.
At this time, the flange 1 fixed to the operation rod 14
7 cannot be moved, so the bracket 15
4, the contact pressure spring 13 is compressed to accumulate energy, and a contact pressure is applied between the contacts 2 and 3 to reach the closed position shown in FIG. 16.

When a trip command is given while the vacuum circuit breaker is in the closed position shown in FIG. 16, the operating mechanism 9 rotates the operating shaft 8 clockwise to move the bracket 15 through the operating lever 11. Pull down in the figure. The bracket 15 is engaged with a nut at the lower end of the operation rod 14 to operate the operation rod 1.
4 is pulled down to release the contacts 2 and 3 of the vacuum switch 4. At the same time as the rotation of the operation shaft 8, the damper lever 18 also rotates clockwise, first hits the oil damper 19 to absorb its energy, and then hits the stopper 20 to stop at the opening position in FIG.

[0007] Such an oil damper (buffer)
If there is no or a failure occurs, the above opening energy cannot be absorbed and the damper lever 18 directly collides with the stopper 20, and the damper lever 18 is rebounded by the surplus opening energy and the operating shaft 8
Is rotated in the closing direction, and the movable contact 3 of the vacuum switch 4 approaches the fixed contact 2. When such a phenomenon occurs, the separation distance between the contacts 2 and 3 becomes insufficient,
Failure of current interruption or breakdown between contacts 2 and 3 causes flashing and current continues to flow even when the vacuum circuit breaker is in the open position, causing vacuum energy to break the vacuum circuit breaker. There are even things to do.

[0008]

As described above,
In conventional vacuum circuit breakers, the shock absorber required to absorb the opening energy and prevent the contact from rebounding is provided as an independent and separate mechanism. Therefore, when viewed as a vacuum circuit breaker as a whole, the device is large and the price is high. Also,
In a device using an oil damper as a shock absorber, the opening energy is not absorbed due to oil leakage etc., which is one of the causes that may cause a failure as a vacuum circuit breaker, and inspection to prevent this・ Maintenance work was required.

[0009]

Accordingly, in the circuit breaker operating device according to the first aspect, the switch having the movable contact between the open position and the closed position is opened and closed by the operation shaft of the operation mechanism. Circuit breaker operating device, comprising: an operating lever fixed to an operating shaft and swinging to an open position or a closed position by the operating shaft to open or close a contact, and the operating lever is in a closed position. And a contact driving device that has a contact pressure spring that applies a contact pressure between the contacts when the contact lever is combined with the operation lever and transmits the movement of the operation lever to the contact of the switch to open and close the contact. An operation lever is provided with a cam device that is combined with a contact driver and stores energy in the contact pressure spring during movement of the operation lever from the closed position to the open position,
The contact drive includes an operating rod connected to the contact and combined with a cam device of the operating lever, the cam device including a forked portion slidably engaged with the operating rod,
The contact pressure spring is a circuit breaker operating device disposed on the operating rod between the operating rod and the forked portion of the cam device.

[0010]

In the circuit breaker operating device according to the second aspect, the cam device is provided at a tip end of the swinging operation lever, and contacts at least at the end of the movement of the operation lever from the closed position to the open position. It is a cam shape acting on the pressure spring.

According to a third aspect of the present invention, there is provided a circuit breaker operating device including a stopper which abuts on the operating rod at a portion where the operating rod and the forked portion engage with each other to limit the radial movement of the operating rod. I have.

According to a fourth aspect of the present invention, there is provided a vacuum circuit breaker, comprising: a casing; a vacuum switch provided in the casing; an operating mechanism having a vacuum switch operating shaft for opening and closing the vacuum switch; The circuit breaker operating device according to claim 1 is provided.

[0014]

In the circuit breaker operating device according to the first aspect, while the operating lever moves from the closed position to the open position, the cam device provided on the operating lever is connected to the contact pressure spring of the contact drive device. Acting to accumulate the contact pressure spring, the forked portion of the cam device is slidably engaged with the operating rod and simultaneously contacts the contact pressure spring.

[0015]

In the circuit breaker operating device according to the second aspect, by selecting the cam shape of the cam device, the cam action acts on the contact pressure spring at least at the end of the movement of the operating lever from the closed position to the open position. I do.

In the circuit breaker operating device according to the third aspect, the stopper abuts on the operating rod to limit the radial movement.

In the vacuum circuit breaker according to the present invention, the cam provided on the operation lever while the operation lever moves from the closed position to the open position in accordance with the operation of the vacuum switch operation shaft of the operation mechanism. The device acts on the contact pressure spring of the contact drive device to store the pressure spring.

[0019]

1 to 3 show a vacuum circuit breaker having a circuit breaker operating device according to an embodiment of the present invention in an open position, and FIGS. 4 to 6 show a vacuum circuit breaker of the present invention. The vessel is shown in the closed position. The vacuum circuit breaker of the present invention includes a casing 1 which is an outer box, and a vacuum switch 4 provided in the casing 1 and having a fixed contact 2 and a movable contact 3 which can be separated from each other. The vacuum switch 4 is fixed to the casing 1 by terminals 5 and 6. The terminal 6 has a flexible conductor 7 so that the movable contact 3 can move toward and away from the fixed contact 2. The vacuum circuit breaker further has an operation mechanism 9 which has an operation shaft 8 which is a crossbar to open and close the vacuum switch 4 according to a closing command or a trip command, and connects the operation shaft 8 to the vacuum switch 4 to open and close the vacuum. And a circuit breaker operating device 30 for opening and closing the circuit breaker 4. The circuit breaker operating device 30 includes an operating lever 31 and a contact driving device 32.
Is a lever which is fixed to the operation shaft 8 and swings by the operation shaft 8 to the open position (FIG. 1) or the closed position (FIG. 4) to open or close the contacts 2 and 3; The device 32 has a contact pressure spring 33 for applying a contact pressure between the contacts 2 and 3 when the operation lever 31 is in the closed position in FIG.
The movement of 1 is transmitted to the contacts 2 and 3 of the switch 4 to open and close.

The operating mechanism 9 includes a charging device and a trip device (not shown) which may be a known device for performing various operations of the vacuum circuit breaker. The operating shaft 8 of the operating mechanism 9 swings to the open position (FIG. 1) or the closed position (FIG. 4) by the rotation of the operating shaft 8 to move the movable contact 3 of the vacuum switch 4 to the open position (FIG. An operation lever 31 for driving to 1) or a closed position (FIG. 4) is attached. In the illustrated example, the operation lever 31 is a member having a structure as shown in FIGS. 11 and 12, and the operation lever 31 is formed integrally with the operation shaft 8 having a polygonal cross section. I have 35.

The operating lever 31 is connected by a cam device 35 at the tip to a contact driving device 32 connected to the movable contact 3. The contact driving device 32 includes an operation rod 36 aligned and fixed to the movable contact 3, and an operation rod 36.
Lock nut 37 with washer provided near the upper end of
A lock nut 38 with a washer provided near the lower end of the operating rod 36 and a contact pressure spring 33 provided on the operating rod 36 between the two lock nuts 37 and 38 are provided. One end of the contact pressure spring 33 has an upper lock nut 37.
The other end is in contact with the contact pressure spring 33 and the lower locking nut 38.
And a cam device 35 of the operation lever 31 inserted between the control lever 31 and the cam lever 35 via a washer 40. In other words, the cam device 35 of the operation lever 31 is inserted between the lower locking nut 38 and the contact pressure spring 33 to compress the contact pressure spring 33, and the cam device 35 varies depending on the rotational position of the operation lever 31. Operating rod 3
By the action of the cam device 35 rotating with respect to 6, the distance between the lower lock nut 38 and the contact pressure spring 33 can be changed, and the amount of compression of the contact pressure spring 33 can be changed. As shown in FIGS. 11 and 12, the operation lever 31 is bifurcated by forming a groove 41 in the cam device 35 at the tip thereof, and this groove 41 is shown in FIGS. Thus, the lower end of the operating rod 36 is received to prevent the lower end of the operating rod 36 from swinging.

As shown in detail in FIGS. 7 to 10, the cam device 35 provided at the distal end of the operating lever 31 has a width X larger than the width of the distal end portion of the operating lever 31, and the cam devices 35 are substantially parallel to each other. A bulge having surfaces 42 and 43.
In the illustrated example, the cam surfaces 42 and 43 are actually curved surfaces that have a very large radius of curvature and bulge slightly outward, and the cam surface 42 has ends 44 and 45 formed therein. Are formed with ends 46 and 47. The cam surface 42 is in contact with the contact pressure spring 33 via the washer 40, and the cam surface 43 is in contact with the lower lock nut 38. The length of the cam surfaces 42 and 43 is such that when the operation lever 31 is rotated to the open position shown in FIGS. The width measured in the axial direction is shown in FIG.
Are larger than the dimension X shown in FIG. In the open position, as shown in FIGS. 2 and 3, a stopper lever 48 fixed to the operation shaft 8 is used.
Abuts against the stopper 49 to prevent the operating shaft 8 from rotating further.

FIGS. 8 to 10 show operating levers 31 when the circuit breaker operating device 30 is in the open position, between the open position and the closed position, and when the circuit breaker operating device 30 is in the closed position. The positional relationship between the and the contact driver 32 is shown in detail.

In FIG. 8, the tip of the operating lever 31 of the circuit breaker operating device 30 is in the open position where the tip of the operating lever 31 is tilted downward by the operating shaft 8 of the operating mechanism 9, and the cam device 35 of the operating lever 31 is turned on. Rotating clockwise with respect to the operating rod 36, the end 44 of the cam surface 42 and the end 47 of the cam surface 43 of the cam device 35 are in contact with the washer 40 and the lock nut 38, respectively. Accordingly, the washer 40 is separated from the lock nut 38 by the dimension Y, and the dimension Y
Is larger than the minimum width dimension X of the cam device 35 (FIG. 7). In this open position, the circuit breaker operating device is shown in FIGS.
And the stopper 49 (FIG. 3) prevents further movement in the contact separating direction.

When a closing command is given to the operating mechanism 9 when the circuit breaker operating device 30 is at the opening position, the operating mechanism 8 causes the operating shaft 8 to rotate together with the operating lever 31 in the counterclockwise direction in FIG. Then, the movable contact 3 is pushed upward through the washer 40, the contact pressure spring 33, and the operation rod 36 while the cam surface 42 of the cam device 35 is inclined with respect to the operation rod 36, and is brought to the intermediate position shown in FIG. .

In this intermediate position, the cam device 35 has its cam surfaces 42 and 43 substantially perpendicular to the operating rod 36, and has the minimum width dimension X. In this embodiment, this dimension X is equal to the distance from the lower locking nut 38 on the operating rod 36 to the step 50 (FIGS. 8 and 9). The washer 40 on the operating rod 36 cannot be moved earlier by the step 50. As described above, since the width of the cam device 35 is minimized at this position, the amount of compression of the contact pressure spring 33 is also minimized.

When the operating lever 31 further rotates counterclockwise beyond the above-mentioned intermediate position and pushes up the movable contact 3 via the contact driving device 32, the movable contact 3 eventually comes into fixed contact. The contact lever 2 contacts the child 2 and cannot move any further, but the operation lever 8 continues to rotate further counterclockwise to exert an upward force on the washer 40. At this time,
Since the upper lock nut 37 fixed to the operating rod 36 cannot move, the washer 40 slides on the operating rod 36 to compress and accumulate the contact pressure spring 33, and the contact pressure between the contacts 2 and 3 is increased. To the closed position shown in FIG. 4 and FIG. In this position, the cam surface 42 of the cam device 35
Of the washer 40 against the action of the contact pressure spring 33.
Is pushing up.

When a trip command is given when the vacuum circuit breaker is in the closed position shown in FIG.
At the same time, the operating lever 31 is rotated clockwise to gradually release the pressing force against the contact pressure spring 33 and return to the intermediate position shown in FIG. In this position, the movable contact 3 is the fixed contact 2
And the current is about to be interrupted. After the operating lever 31 further rotates and moves beyond the intermediate position, the operating rod 36 is pulled down by the cam surface 43 of the cam device 35 via the lower lock nut 38 in the figure, and the contact is completely removed. At the opening position shown in FIG.

As described above, before the circuit breaker operating device 30 moves from the intermediate position to the opening position, the washer 4 is operated.
0 and a cam device 35 inserted between the lock nut 38
Are rotated clockwise while moving as a whole in the figure, and the end 44 of the cam surface 42 and the end 4 of the cam surface 43 are rotated.
7, the washer 40 is moved away from the lock nut 38 to compress the contact pressure spring 33 to accumulate energy. During this time,
The movable contact 3 and the contact drive 32, which are rapidly moved in the opening direction by the circuit breaker operating device 30, try to move further beyond the opening position to be stopped there due to their inertial energy. I do.

However, in the circuit breaker operating device 30 of the present invention, this opening energy is used to rotate the operating lever 31 and also the cam device 35. It is consumed to compress and store energy. Therefore, before the operating lever 31 moves from the intermediate position in FIG. 7 to reach the opening position in FIG.
9 is compressed by the dimension of YZ obtained by subtracting the dimension Z from the dimension Y of FIG. 8, the opening contact energy is sufficiently absorbed by the contact pressure spring 33, and rebounds even when the stopper lever 48 shown in FIG. In this case, the contact can be prevented from rebounding when the contact is opened, so that there is no need to provide a separate shock absorber, and the operating device can be small, highly reliable, and inexpensive.

FIGS. 11 and 12 show perspective views of the operating lever 31 of the circuit breaker operating device 30 of the present invention, together with other related parts. In FIG. 11, three operation levers 31 are provided on the operation shaft 8 of the operation mechanism 9 at intervals. An operation lever 31 formed integrally with the operation shaft 8 having a long polygonal cross section is configured to rotate integrally with the operation shaft 8. Flange members 51 are integrally formed on both sides of the operation lever 31.

The fork formed by the groove 41 in the cam device 35 of the operating lever 31 is slidably engaged with the operating rod 36 between the lock nut 38 on the lower side of the operating rod 36 and the washer 40. The cam device 35 is in contact with the contact pressure spring. As described above, the forked portion of the cam device 35 is slidably engaged with the operating rod 36 and is in contact with the contact pressure spring 33, supports the operating rod 36 from both sides, and connects the contact pressure spring 33 to the two forked portions. You will support in terms of points. Therefore, the positional relationship between the cam device 35 and the operation rod 36 is stabilized, and the assembling is easy. Also, the contact relationship between the cam device 35 and the contact pressure spring 33 is stabilized, and the reliability of the operating device of the circuit breaker can be increased.

As best shown in FIG. 13, the circuit breaker operating device 30 of the present invention is further supported at one end by a structural material such as the casing 1 of the circuit breaker and at the other end by the operating rod 36.
A rod-shaped stopper 52 is provided in contact with the operation rod 31 at a portion where the fork (groove 41) of the cam device 35 engages with the operation rod 31 to limit the swing and movement of the operation rod 36 in the radial direction. This is to limit the movement of the operation rod 36 to the opening side in the radial direction by contacting the operation rod 36 with the stopper 52 restricted from the opening side of the groove 41. Since such a stopper 52 is provided, the operation rod 36
Can be limited, and the operation reliability can be improved by a simple configuration.

[0034]

According to the circuit breaker operating device of the first aspect,
A circuit breaker operating device for opening and closing a switch having a movable contact between an open position and a closed position by an operation shaft of an operation mechanism, wherein the circuit breaker operation device is fixed to the operation shaft and is opened or closed by the operation shaft. An operating lever that swings to the closed position to open or close the contact, and a contact pressure spring that applies a contact pressure between the contact when the operating lever is in the closed position, is combined with the operating lever, A contact driver for transmitting the movement of the operating lever to the contact of the switch to open and close the contact, wherein the operating lever is combined with the contact driver to move the operating lever from the closed position to the open position. A cam device that accumulates in the contact pressure spring during movement; a contact drive device includes an operation rod connected to the contact and combined with a cam device of the operation lever; the cam device slides with respect to the operation rod; Two engaging possible Comprising a part, the contact pressure spring is disposed between the bifurcated portion of the operating rod and the cam device on the operating rod. Therefore, while the operation lever moves from the closed position to the open position, the cam device provided on the operation lever acts on the contact pressure spring of the contact driver to accumulate the contact pressure spring, and the bifurcated portion of the cam device. Is slidably engaged with the operating rod and simultaneously comes into contact with the contact pressure spring, so that excess energy at the time of separation is absorbed by the contact pressure spring, so that the contact can be prevented from rebounding at the time of opening, and a separate shock absorber is provided. There is no need to provide a control device, and the operating device can be small, highly reliable, and inexpensive. In addition, the fork portion of the cam device is slidably engaged with the operation rod and simultaneously comes into contact with the contact pressure spring, so that the positional relationship between the cam device and the operation rod is stable, the assembly is easy, and The contact relationship between the device and the contact pressure spring is also stabilized, and the reliability of the operating device can be increased.

[0035]

[0036] In the circuit breaker operating device according to the second aspect, the cam device is provided at the tip of the swinging operating lever, and contacts at least at the end of the movement of the operating lever from the closed position to the open position. Since the cam shape acts on the pressure spring, the cam action acts on the contact pressure spring at least at the end of the movement of the operating lever from the closed position to the open position by selecting the cam shape of the cam device, and the contact is separated. Without hindering the operation, the opening energy can be absorbed immediately before the separation operation is completed to prevent the contact from rebounding.

In the circuit breaker operating device according to a third aspect of the present invention, there is provided a stopper which comes into contact with the operating rod at a portion where the operating rod and the forked portion engage to limit the radial movement of the operating rod. Since the stopper abuts on the operation rod, the movement in the radial direction can be restricted, the swing of the axis of the operation rod can be restricted, and the operation reliability can be improved with a simple configuration.

According to a fourth aspect of the present invention, there is provided a vacuum circuit breaker, comprising: a casing; a vacuum switch provided in the casing; an operating mechanism having a vacuum switch operating shaft for opening and closing the vacuum switch; A cam provided on the operation lever while the operation lever is moved from the closed position to the open position in accordance with the operation of the vacuum switch operation shaft of the operation mechanism. The device acts on the contact pressure spring of the contact drive device to accumulate the contact pressure spring, and the excess energy at the time of opening is absorbed by the contact pressure spring, preventing the contact of the vacuum switch from rebounding when the contact is opened. It is not necessary to provide a separate shock absorber in the circuit breaker operating device, and the vacuum circuit breaker can be small, highly reliable, and inexpensive.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view taken along line AA of FIG. 2, showing a state where a vacuum circuit breaker using a circuit breaker operating device according to an embodiment of the present invention is in an open position.

FIG. 2 is a schematic front view of the vacuum circuit breaker of FIG.

FIG. 3 shows a stopper of the vacuum circuit breaker of FIG. 1;
FIG. 3 is a schematic side sectional view taken along line BB of FIG. 2.

4 is a schematic cross-sectional side view taken along line CC of FIG. 5, showing a state in which a vacuum circuit breaker using the circuit breaker operating device of the embodiment of the present invention is in a closed position.

FIG. 5 is a schematic front view of the vacuum circuit breaker of FIG.

6 shows a stopper of the vacuum circuit breaker of FIG. 4,
FIG. 6 is a schematic side sectional view taken along line DD in FIG. 5.

FIG. 7 is a side view showing an operation lever of the circuit breaker operation device of the present invention.

FIG. 8 is a side view showing the operating lever and the operating rod of the circuit breaker operating device according to the present invention in an open position.

FIG. 9 is a side view showing the operation lever and the operation rod of the circuit breaker operation device of the present invention at an intermediate position.

FIG. 10 is a side view showing the operation lever and the operation rod of the circuit breaker operation device of the present invention in a closed position.

FIG. 11 is a perspective view showing an operation lever integrally formed with an operation shaft of the circuit breaker operation device of the present invention.

FIG. 12 is an exploded perspective view showing an operation lever and a flange, which are originally integrated, so that the operation lever portion of FIG. 11 is easily understood.

FIG. 13 is a schematic side sectional view showing a stopper of the circuit breaker operating device of the present invention.

FIG. 14 shows a state in which the vacuum circuit breaker using the conventional circuit breaker operating device is in the open position, and is a line E- in FIG.
It is a schematic side sectional view along E.

FIG. 15 is a schematic front view of the vacuum circuit breaker of FIG.

FIG. 16 shows a state in which the vacuum circuit breaker using the conventional circuit breaker operating device is in the closed position;
It is a schematic side sectional view along F.

FIG. 17 is a schematic front view of the vacuum circuit breaker of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing, 2 and 3 contactor, 4 switch, 8 operating shaft, 9 operating mechanism, 30 circuit breaker operating device, 31
Operating lever, 32 contact driver, 33 contact pressure spring,
35 cam device, 36 operating rod, 41 groove, 49
Stopper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-94728 (JP, A) JP-A-8-77892 (JP, A) JP-A-6-251665 (JP, A) JP-A-8-78 222091 (JP, A) JP-A-8-185772 (JP, A) JP-A-56-152020 (JP, U) JP-A-2-31039 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 3/60 H01H 33/28-33/59

Claims (4)

(57) [Claims] 1. A circuit breaker operating device for operating a switch having a movable contact between an open position and a closed position by an operating shaft of an operating mechanism, wherein the operating device is fixed to the operating shaft. An operating lever that swings to an open position or a closed position by a shaft to open or close the contact, and a contact pressure spring that applies a contact pressure between the contacts when the operating lever is in the closed position; A contact drive device that is combined with the operation lever and transmits the movement of the operation lever to the contact of the switch to open and close the contact; wherein the operation lever is configured to drive the contact A cam device which, in combination with a device, stores energy in the contact pressure spring during movement of the operating lever from the closed position to the open position, wherein the contact driving device is connected to the contact and operates the operating lever.
The operating rod combined with the above cam device of the operating lever
With the cam device slidable on the operating rod
The contact pressure spring has a bifurcated portion that engages with the operating lock.
Between the operating rod and the forked portion of the cam device
A circuit breaker operating device arranged between them . 2. The cam device according to claim 1, wherein said cam device is provided at a tip portion of said swinging operation lever, said cam device acting on said contact pressure spring at least at the end of movement of said operation lever from said closed position to said open position. The circuit breaker operating device according to claim 1 , wherein Wherein the above operating rod and the forked portion is in contact with the operating rod in the portion to be engaged, there claim 1, further comprising a stopper for limiting the radial movement of the operating rod have
Is a circuit breaker operating device according to 2. 4. The circuit breaker operating device according to claim 1, further comprising an operating mechanism having a casing, a vacuum switch provided in the casing, a vacuum switch operating shaft, and opening and closing the vacuum switch. And a vacuum circuit breaker comprising: