JPH022010Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an extraction type circuit breaker, and particularly to a releasing device for a position lock of a circuit breaker.

Conventionally, in an extraction type circuit breaker, an operation handle is inserted from the front surface of the front cover and connected to a worm shaft, and the circuit breaker is operated by operating the operation handle to drive the worm wheel shaft via the worm. For those that extract and insert the circuit breaker body into the connection, test, and disconnection positions, it is equipped with a positioning locking mechanism to hold the circuit breaker body in each position, and also has a locking mechanism that connects to the front cover into which the operating handle is inserted. A shutter plate is provided to keep the girder extraction operation hole closed if a circuit breaker is turned on, and during extraction operation, the release of the positioning lock and the operation of opening the shutter plate of the extraction operation hole are performed separately. is being carried out.

Problems that the invention aims to solve: Therefore, if the positioning lock is released and the circuit breaker is closed, the shutter will not open, and if left in this state, the positioning lock will remain released. Therefore, if the circuit breaker is moved in the extraction direction due to vibration or the like, the circuit breaker remains energized, resulting in damage and danger.

Means for Solving the Problems Therefore, the purpose of this invention is to solve the above-mentioned drawbacks of the prior art and to provide an extractor that can release the positioning lock and open the shutter of the extractor operation hole in one operation. An object of the present invention is to provide a positioning lock release device for a circuit breaker.

To summarize this invention, the positioning lock release device is an extraction type circuit breaker, which includes a positioning locking mechanism for each operation position consisting of a lock cam and a lock lever, a positioning lock release lever for releasing the positioning lock, and an extraction type circuit breaker. It consists of a shutter lever equipped with a shutter plate that shields the operation hole, a connecting plate that connects the lock lever and the shutter lever, and a foot lever that detects the open/close position of the circuit breaker and prevents movement of the shutter lever or lock lever when the circuit breaker is turned on. When the circuit breaker is closed, the release operation by the positioning lock release lever is blocked, and if the circuit breaker is open, the shutter of the extraction operation hole is opened in conjunction with the positioning lock release operation. be.

Embodiment In FIGS. 1 to 3 of the drawings, the circuit breaker includes a circuit breaker body 1, a fixing frame 2, a front cover 3 of the circuit breaker body 1, and a circuit breaker body 1.
Extracting roller 4 attached via attachment member 5 to
and an extraction rail 6 that is attached to the fixed frame 4 and slidably supports the circuit breaker main body 1 by means of an extraction roller 4.

The worm wheel shaft 7 is provided over the entire width on the inside front side of the circuit breaker main body, and the worm wheel 8 is integrally attached to the left side of the center. A worm shaft 10 connected to a worm 9 that meshes with the worm wheel 8 at right angles is arranged corresponding to an extraction operation hole 11 provided in the front cover 3. Further, a shutter plate 12 is provided between the front end surface of the worm shaft 10 and the extraction operation hole 11 to prevent an inadvertent extraction operation. The worm wheel shaft 7 is rotatably supported by the frame on the side of the circuit breaker main body, and extraction levers 13 are attached to both ends. An extraction lever roller 14 is fitted in the extraction lever 13 into an extraction lever guide groove 16 of a guide member 15 attached to the fixed frame 2.

To explain the extraction operation of the circuit breaker body 1, the extraction operation hole 11 is generally moved from the connection position shown in FIG. 2A to the test position shown in FIG. 2B, and from the test position shown in FIG. 2B to the disconnection position shown in FIG. 2C. Insert the operating handle (not shown) into the worm shaft 10.
When the worm shaft 10 is rotated, the worm wheel shaft 7 is rotated via the worm 9 and the worm wheel 8, and the extraction lever rollers 1 attached to the extraction levers at both ends of the worm wheel shaft 7 are rotated.
4 slides and presses the extraction lever guide groove 16, so that the extraction operation of the circuit breaker body 1 is performed.
Further, by rotating the worm shaft 10 in the opposite direction, the circuit breaker main body 1 is inserted.

As shown in FIG. 3, the worm wheel 8 and the worm 9 are arranged between a pair of corresponding support frame members 17 with a gap on the side of the circuit breaker main body, and pass through the support frame members 17 so as to be rotatable. A worm wheel 8 is attached to the worm wheel shaft 7, and a worm 9 that meshes with the worm wheel 8 is supported by a bearing member 18 attached between a pair of support members 17, and a worm shaft 10 is integrally connected to the worm 9. It extends to correspond to the extraction operation hole 11 of the front cover 3.

Figures 4 to 6 show the positioning and locking mechanism of this circuit breaker main body. Figure 4 is a partial side sectional view showing the locked state in the connected position, and Figure 5 is the unlocked state. FIG. 6 is a cross-sectional view taken along line A-A' in FIG. 4 in the direction of the arrow. In FIGS. The lock cam 20 is mounted integrally with the worm wheel shaft 7 on the outside of the pair of support frame members 17 sandwiched therebetween, and positioning grooves 20a, 20b, and 20c are provided on the periphery of the lock cam 20 for locking at each of the connection, test, and disconnection positions. It is being The lock lever 21 has parallel arms 21a and 21b as shown in FIGS.
1b and is integrally connected to the lock lever 21.
is rotatably supported by a pair of support frame members 17 via a shaft 22, and a lock pin 23 is attached to the other end of the arm 21a.
The circuit breaker body 1 is engaged with each positioning groove 20a, 20b, 20c of the circuit breaker body 1 at each operating position. The stopper pin 24 is provided so as to slidably pass through a U-shaped support member 26 attached to the support frame member 25 so that its lower end corresponds to the worm shaft 10.
The upper end is connected to a stopper operating plate 27 that engages with the connecting portion 21c of the lock lever 21.
The stopper spring 28 is installed between the stopper pin 24 and the support member 26, and is always connected to the worm shaft 10.
The lock release lever spring 34 (see FIGS. 7 and 8) is always biased to rotate the lock lever 21 counterclockwise.

Engagement grooves 30 are provided on the worm shaft 10 every 1/4 rotation in correspondence with the stopper pin 24, and the engagement grooves 30 between the stopper pin 24 and the worm shaft 10 are arranged in synchronization with the time when the lock pin 23 engages with each positioning groove of the lock cam 20. It is provided so as to be engaged with the engagement groove 30.

In FIG. 4, the positioning groove 20a of the lock cam 20 and the lock pin 23 of the lock lever 21 are engaged, and the stopper pin 24 is connected to the worm shaft 1.
0 and holds the circuit breaker main body 1 stopped at each operating position. Next, by pushing down the positioning lock release lever 31 (see FIG. 7) and rotating the lock lever 21 clockwise, the positioning groove 20a of the lock cam 20 and the lock pin 23 of the lock lever 21 are disengaged, and the lock lever is released. The connecting portion 21c of the worm shaft 10 engages with the stopper operating plate 27 and pulls up the stopper pin 24 against the stopper spring 28 so as to disengage the engagement groove 30 of the worm shaft 10, and the worm shaft 10 is slightly moved. Rotate lock cam 2
FIG. 5 shows a state in which the lock pin 23 rides on the outer peripheral edge of the lock cam 20 due to the rotation of the lock pin 23. Furthermore, by rotating the worm shaft 10, the positioning groove 2 of the lock cam 20 is
0b and the lock pin 23 are automatically engaged, and the stopper pin 24 is stopped at the test position where it is engaged with the engagement groove 30 of the worm shaft. In this way, the connection, test, and disconnection positions are sequentially stopped and held.

Effects of the invention Figures 7 to 11 are related explanatory diagrams showing the positioning lock release device. Figure 7 is a side view showing the positioning lock release lever in the locked position, and Figure 8 is the positioning lock release device. FIG. 9 is a side view showing the lock release lever in the release position, FIG. 9 is a side view showing the process of the positioning lock release lever automatically returning from the release position to the lock position, and FIG. 10 is the same as in FIG. partial plan view,
FIG. 11 is a partial bottom view of FIG. 7.

First, the positioning lock release lever 31 is bent into a U-shape on the inner end side, is rotatably supported by the support frame member 17 by a shaft 32, and one end of the first parallel arm 31a is attached to the front cover 3. The second arm 31b is exposed at the front to form an operating handle, and the tip of the second arm 31b is provided so as to correspond to the engager 33 provided at the tip of the arm 21b of the lock lever 21. The positioning lock release lever spring 34 is connected to the positioning lock release lever 31 and the lock lever arm 21.
The positioning lock release lever 3 is installed between the
1 is always biased clockwise. The hook lever 35 is rotatably supported at its center by the worm wheel shaft 7, and has an engagement groove 35a at one end and a hook portion 35b at the other end. For example, it is connected to an opening/closing position detection pin 36 attached to an opening/closing crossbar that integrally connects movable contact devices of a circuit breaker, and a hook portion 35b is provided so as to be able to engage and release the tail end of a shutter lever 37. It is being The shutter lever 37 has a first arm 37a equipped with a shutter plate 12 for opening and closing the extraction operation hole 11 at one end, and a second arm 37c integrally connected by a connecting portion 37b across a pair of support frame members. , second arm 37
The other end of c is rotatably supported by a shaft 38 in correspondence with the hook portion 35b of the hook lever 35. The connecting plate 39 connects the second arm 37c of the shutter lever 37 and the arm 21a of the lock lever 21, and is connected to the lock lever 21a by a pin 40, and the long groove 39a of the connecting plate 39 and the shutter lever 37c are connected by the pin 41. Connected with play. The trip shaft 42 of the trip mechanism rotates to collapse the opening/closing mechanism of the circuit breaker to open the circuit.A trip piece 43 is attached to the trip shaft 42, and the trip piece 4
3 is provided corresponding to the engagement protrusion piece 44 provided on the shutter lever 37.

In the state shown in FIG. 7, when the circuit breaker is in the open position, the hook lever 35 is in the position shown by the two-dot chain line, and the hook portion 35b of the foot lever 35 is disengaged from the tail end of the shutter lever 37c. It's dark. When the handle of the positioning lock release lever 31 is pushed down in this state, it rotates about the shaft 32 and the second arm 31b moves the lock lever 2.
The lock lever 21 is rotated clockwise about the shaft 22, and the lock pin 23 of the lock lever 21 is disengaged from the positioning groove of the lock cam 20. The reinforcing stopper pin 24 shown in FIG. 4 is disengaged from the engagement groove 30 of the worm shaft 10. Further, the rotation of the lock lever 21 pushes down the shutter lever 37 via the connecting plate 39 and rotates the shutter lever 37 clockwise about the shaft 38 to open the shutter plate 12 that closes the extraction operation hole 11. The projection piece 44 rotates the trip piece 44 counterclockwise to prevent the circuit breaker from closing, and the operating handle is connected to the worm shaft 10 from the extraction operation hole 11 to achieve the state shown in FIG. 8 in which extraction operation can be performed. becomes.

Therefore, when the lock cam 20 is rotated by operating the worm shaft 10, its outer periphery pushes the lock pin 24 of the lock lever, and when the lock cam 20 is further rotated a little, the clockwise rotation of the lock lever 21 pushes the lock pin 24 of the lock lever. When the positioning lock release lever 31 is disengaged from the engagement element 33 of the lock lever, the positioning lock release lever 31 is automatically returned to the position shown by the two-dot chain line in FIG. 9 by the positioning lock release lever spring 34. do. Note that when the circuit breaker is in the closed circuit position, the hook portion 35b of the hook lever 35 is closed as shown in FIG.
is engaged with one end of the shutter lever 37, and even if an attempt is made to push down the positioning lock release lever 31, the rotation of the lock lever 21 is blocked by the pin 41 of the shutter lever 37 via the connecting plate 39, and the release operation cannot be performed.

In order to prevent operation of the positioning lock release lever 31 in the closed state of the circuit breaker, the first
The same effect can be obtained even if the hook portion 35b of the hook lever 35 is modified to releasably engage the lock pin 23 of the lock lever 21 as shown in FIG.

Effects of the invention As described above, according to this invention, if the circuit breaker is turned on, the positioning lock release lever 3
1, the positioning lock cannot be released, and if the circuit breaker is opened, the positioning lock is released by operating the positioning lock release lever 31, and the extraction operation hole 11 is opened. Since the shutter plate 12 is linked to open, the preparation for extraction operation is completed with one operation of the positioning lock release lever 31, and the feeding state may continue with the positioning lock being released. This makes the operation easier and the safety effect even higher.

[Brief explanation of the drawing]

Figures 1 to 11 show an embodiment of the circuit breaker positioning lock release device of this invention.
Fig. 1 is a simplified front view of a circuit breaker implementing this invention, Fig. 2A is a disconnection position, Fig. 2B is a test position, Fig. 2C is a simplified side view showing the extraction operation in the test position, and Fig. 3 is a partial side view showing the relationship between the worm and the worm wheel, and Figures 4 to 6 show the positioning and locking mechanism of the circuit breaker main body in this invention. Figure 4 shows the locked state in the connected position. 5 is a partial side sectional view when the lock is released, and FIG. 6 is a partial side sectional view shown in FIG. 4.
A sectional view taken along line A' in the direction of the arrow, and FIGS. 7 to 11 are related explanatory views showing the positioning lock release device, and FIG. 7 shows the positioning lock release lever in the locked position. A side view; FIG. 8 is a side view showing the positioning lock release lever in the release position;
FIG. 9 is a side view showing the process in which the positioning lock release lever automatically returns from the release position to the lock position;
Fig. 10 is a partial plan view of Fig. 7, and Fig. 11 is a partial plan view of Fig. 7.
The partial bottom view of the figure, FIG. 12, is a view similar to FIG. 7 showing a modified example of the shutter lever. In the figure,
1: Circuit breaker body, 2: Fixed frame, 3: Front cover, 4: Extraction roller, 5: Mounting member, 6: Extraction rail, 8: Worm wheel, 9: Worm, 10: Worm shaft, 11: Extraction Operation hole, 1
2: Shutter plate, 13: Extraction lever, 14: Extraction lever roller, 15: Guide member, 16: Extraction lever guide groove, 17: Support member, 18: Bearing member, 20: Lock cam, 20a, 20b, 20
c: Positioning groove, 21: Lock lever, 21a,
21b: Arm, 22: Axis, 23: Lock pin, 2
4: Stopper pin, 25, 26: Support member, 2
7: Operating plate, 28: Stopper spring, 29: Lock lever spring, 30: Engagement groove, 31: Positioning lock release lever, 33: Engagement element, 34: Lock release lever spring, 35: Foot lever, 36: Open/close position Detection pin, 37: Shutter lever, 39:
Connecting plate, 40, 41: pin, 42: trip shaft, 43: trip piece, 44: engaging projection piece.

Claims (1)

[Scope of utility model registration request] Insert the operation handle through the extraction operation hole in the front cover, connect it to the worm shaft, and drive the worm wheel shaft through the worm to extract the circuit breaker body to the connection, test, and disconnection operation positions. The extraction type circuit breaker to be inserted has a lock cam attached to the worm wheel shaft and having a positioning groove on its periphery, and a lock pin rotatably supported and releasably engaged with the positioning groove on one side. A lock lever, a positioning lock release lever that is rotatably supported so as to interlock with the lock lever, and a shutter plate that shields between the extraction operation hole and the worm shaft, and is rotatably supported. a shutter lever; a connecting plate connecting the lock lever and the shutter lever;
a hook lever that is rotatably supported and has one end connected to the open/close detection pin of the circuit breaker and the other end engaged with one end of the shutter lever or lock lever when the circuit breaker is in the closed position; When the circuit breaker is closed, the release operation by the positioning lock release lever is blocked, and when the circuit breaker is opened, the positioning lock is released by operating the positioning lock release lever, and the shutter plate that shields the extraction operation hole is opened. Positioning lock release device for circuit breakers.